U.S. patent application number 16/981711 was filed with the patent office on 2021-01-21 for battery pack case and battery pack.
This patent application is currently assigned to Contemporary Amperex Technology Co., Limited. The applicant listed for this patent is Contemporary Amperex Technology Co., Limited. Invention is credited to Derong WANG, Lei WANG, Peng WANG, Zhichao WANG, Linggang ZHOU.
Application Number | 20210020892 16/981711 |
Document ID | / |
Family ID | 1000005135983 |
Filed Date | 2021-01-21 |
United States Patent
Application |
20210020892 |
Kind Code |
A1 |
WANG; Lei ; et al. |
January 21, 2021 |
BATTERY PACK CASE AND BATTERY PACK
Abstract
The present application relates to a battery pack case and a
battery pack. The battery pack case includes: a bottom plate and a
side plate connected to the bottom plate, the bottom plate and the
side plate surround to form an accommodating portion configured to
accommodate a unit cell; a plurality of first insulating strips are
provided on a surface of the bottom plate facing the accommodating
portion, the plurality of first insulating strips are sequentially
spaced along a length direction or a width direction of the bottom
plate, and a glue receiving groove is formed between two adjacent
first insulating strips.
Inventors: |
WANG; Lei; (Ningde City,
Fujian, CN) ; WANG; Zhichao; (Ningde City, Fujian,
CN) ; WANG; Derong; (Ningde City, Fujian, CN)
; WANG; Peng; (Ningde City, Fujian, CN) ; ZHOU;
Linggang; (Ningde City, Fujian, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Contemporary Amperex Technology Co., Limited |
Ningde City, Fujian |
|
CN |
|
|
Assignee: |
Contemporary Amperex Technology
Co., Limited
Ningde City, Fujian
CN
|
Family ID: |
1000005135983 |
Appl. No.: |
16/981711 |
Filed: |
December 28, 2018 |
PCT Filed: |
December 28, 2018 |
PCT NO: |
PCT/CN2018/124620 |
371 Date: |
September 17, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01M 50/20 20210101;
H01M 50/528 20210101 |
International
Class: |
H01M 2/22 20060101
H01M002/22; H01M 2/10 20060101 H01M002/10 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 30, 2018 |
CN |
201820465105.8 |
Claims
1. A battery pack case, comprising: a bottom plate and a side plate
connected to the bottom plate, wherein the bottom plate and the
side plate surround to define an accommodating portion configured
to accommodate a unit cell; a plurality of first insulating strips
provided on a surface of the bottom plate facing the accommodating
portion, wherein the plurality of first insulating strips are
sequentially spaced along a length or width direction of the bottom
plate, and a glue receiving groove is formed between two adjacent
first insulating strips.
2. The battery pack case according to claim 1, wherein, the battery
pack case further comprises a plurality of second insulating
strips, the plurality of first insulating strips and each of the
second insulating strips are arranged to intersect, and the glue
receiving groove is formed between the two adjacent first
insulating strips and two adjacent second insulating strips.
3. The battery pack case according to claim 1, wherein the battery
pack case further comprises a first side insulating strip, the
first side insulating strip extends along the length direction of
the bottom plate and is disposed at connection between a long side
of the bottom plate along the length direction of the bottom plate
and the side plate in covering manner.
4. The battery pack case according to claim 3, wherein a cross
section of the first side insulating strip is L-shaped.
5. The battery pack case according to claim 1, wherein the battery
pack case further comprises a second side insulating strip, the
second side insulating strip extends along the width direction of
the bottom plate, and is disposed at a wide side of the bottom
plate along the width direction of the bottom plate, connected to
the side plate in covering manner.
6. A battery pack, comprising: a battery pack case comprising a
bottom plate and a side plate connected to the bottom plate,
wherein the bottom plate and the side plate surround to define an
accommodating portion configured to accommodate a unit cell; and a
plurality of first insulating strips provided on a surface of the
bottom plate facing the accommodating portion, wherein the
plurality of first insulating strips are sequentially spaced along
a length or width direction of the bottom plate, and a glue
receiving groove is formed between two adjacent first insulating
strips; a plurality of battery assemblies provided in the
accommodating portion, wherein the plurality of battery assemblies
are arranged side by side along the width direction of the bottom
plate, and each battery assembly comprises a plurality of unit
cells arranged side by side along the length direction of the
bottom plate; and the first insulating strips are arranged between
a bottom of the battery assembly and the bottom plate.
7. The battery pack according to claim 6, wherein the battery pack
further comprises a first insulating buffer sheet, the first
insulating buffer sheet extends along the length direction of the
bottom plate, and the first insulating buffer sheet is provided
between the battery assembly adjacent to the side plate and the
battery pack case.
8. The battery pack according to claim 7, wherein the first
insulating buffer sheet comprises a first connection section and a
second connection section that intersect, the first connection
section is bonded to a surface of the battery assembly facing the
side plate, and the second connection section is positioned between
the bottom of the battery assembly and the bottom plate.
9. The battery pack according to claim 6, wherein the battery pack
further comprises a second insulating buffer sheet, the second
insulating buffer sheet extends along the width direction of the
bottom plate, and the second insulating buffer sheet is provided
between bottoms of two unit cells positioned on the outermost side
in the battery assembly and the battery pack case.
10. The battery pack according to claim 9, wherein the second
insulating buffer sheet comprises a accommodating recess, a part of
the bottoms of the two unit cells is inserted into the
accommodating recess to be covered by the second insulating buffer
sheet, and the second insulating buffer sheet is bonded to the two
unit cells.
Description
CROSS-REFERENCE OF RELATED APPLICATIONS
[0001] This application is a National Stage of International
Application No. PCT/CN2018/124620 filed on Dec. 28, 2018, which
claims the priority of the Chinese patent application
201820465105.8 entitled "Battery Pack Case and Battery Pack" filed
on Mar. 30, 2018, both of which are incorporated herein by
reference in their entireties.
TECHNICAL FIELD
[0002] The present application relates to the technical field of
batteries, in particular to a battery pack case and a battery
pack.
BACKGROUND
[0003] With the continuous development of new energy technologies,
secondary batteries (rechargeable batteries) are more and more
widely used, for example, hybrid vehicles or electric vehicles.
However, the safety issues of devices using secondary batteries are
gradually exposed to the public's vision, which also affects the
development of secondary batteries. When the unit cells usually
need to be used in groups, a bus bar is needed to connect each unit
cell in series or in parallel. A plurality of unit cells form a
battery module in groups. A plurality of battery modules are
packaged through a pack case to form a battery pack. At present, in
order to improve the energy density of the battery pack, the
technical solutions basically adopt the bottom plate-free solution
with the bottom of the battery module glued. However, the use of
the bottom plate-free solution will also bring about the problem of
insulation of the battery pack and the control of the amount of
glue applied to the bottom of the battery, which cannot guarantee
the safe distance and gluing thickness between the unit cell and
the pack case. The battery system often causes an abnormal
insulation alarm due to direct contact between the pack case and
the unit cell, and the battery pack may also cause occurrence of
dangerous situation due to the abnormal insulation.
SUMMARY
[0004] Embodiments of the present application provide a battery
pack case and a battery pack. The battery pack case can effectively
maintain the insulation state between the battery pack case and the
unit cell and avoid the abnormal insulation alarm caused by
contacting between the unit cell and the battery pack case. At the
same time, the amount of glue can be controlled to ensure the
uniform thickness of the glue.
[0005] In an aspect, an embodiment of the present application
proposes a battery pack case, which includes: a bottom plate and a
side plate connected to the bottom plate, the bottom plate and the
side plate surround to define an accommodating portion for
accommodating a unit cell; a plurality of first insulating strips
arranged on a surface of the bottom plate facing the accommodating
portion, and a plurality of first insulating strips are
sequentially spaced along the length direction or the width
direction of the bottom plate, and a glue receiving groove is
formed between two adjacent first insulating strips.
[0006] According to an aspect of an embodiment of the present
application, the battery pack case further includes a plurality of
second insulating strips, a plurality of first insulating strips
and each of the second insulating strips are arranged to intersect,
a glue receiving groove is formed between two adjacent first
insulating strips and two adjacent second insulating strips.
[0007] According to an aspect of an embodiment of the present
application, the battery pack case further includes a first side
insulating strip that extends along the length direction of the
bottom plate and is disposed at connection between the long side of
the bottom plate along the length direction of the bottom plate and
the side plate in covering manner.
[0008] According to an aspect of the embodiment of the present
application, a cross section of the first side insulating strip is
L-shaped.
[0009] According to an aspect of an embodiment of the present
application, the battery pack case further includes a second side
insulating strip, the second side insulating strip extends along
the width direction of the bottom plate, and is disposed at a wide
side of the bottom plate along the width direction of the bottom
plate, connected to the side plate in covering manner.
[0010] The battery pack case of the embodiment of the present
application includes a bottom plate capable of supporting a unit
cell and a side plate connected to the bottom plate. A plurality of
first insulating strips with good insulation performance are
provided on the bottom plate. The first insulating strips are
arranged between the bottom of the unit cell and the bottom plate,
which can isolate the unit cell from the bottom plate, keep a
predetermined distance between them and insulate from each other,
and avoid contacting between them and the occurrence of insulation
abnormalities, causing electrical connection between the two and
there is a danger of short circuit and fire. A glue receiving
groove is formed between two adjacent first insulating strips to
facilitate filling a predetermined amount of insulation glue. The
first insulating strip can prevent the insulating glue from
overflowing. The first insulating strip can control the thickness
of the insulating glue layer through its own thickness, thereby
ensuring a flat surface of the insulating glue and also avoiding
waste of the insulating glue.
[0011] In another aspect, an embodiment of the present application
provides a battery pack, including: a battery pack case comprising
a bottom plate and a side plate connected to the bottom plate, the
bottom plate and the side plate surround to define an accommodating
portion configured to accommodate a unit cell; and a plurality of
first insulating strips provided on a surface of the bottom plate
facing the accommodating portion, the plurality of first insulating
strips are sequentially spaced along a length or width direction of
the bottom plate, and a glue receiving groove is formed between two
adjacent first insulating strips; a plurality of battery
assemblies, provided in the accommodating portion, the plurality of
battery assemblies are arranged side by side along the width
direction of the bottom plate, each battery assembly includes a
plurality of unit cells arranged side by side along the length
direction of the bottom plate; the first insulating strip is
disposed between the bottom of the battery assembly and the bottom
plate.
[0012] According to another aspect of the embodiments of the
present application, the battery pack further includes a first
insulating buffer sheet that extends along the length direction of
the bottom plate, and the first insulating buffer sheet is disposed
between the battery assembly adjacent to the side plate and the
battery pack case.
[0013] According to another aspect of the embodiments of the
present application, the first insulating buffer sheet includes a
first connection section and a second connection section that
intersect, the first connection section is bonded to a surface of
the battery assembly facing the side plate, and the second
connection section is positioned between the bottom of the battery
assembly and the bottom plate.
[0014] According to another aspect of the embodiments of the
present application, the battery pack further includes a second
insulating buffer sheet, the second insulating buffer sheet extends
along the width direction of the bottom plate, a second insulating
buffer sheet is provided between the bottoms of the two unit cells
positioned on the outermost side of the battery assembly and the
battery pack case.
[0015] According to another aspect of the embodiments of the
present application, the second insulating buffer sheet includes a
accommodating recess, a part of the bottoms of the two unit cells
is inserted into the accommodating recess to be covered by the
second insulating buffer sheet, and the second insulating buffer
sheet is bonded to the two unit cells.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The features, advantages, and technical effects of exemplary
embodiments of the present application will be described below with
reference to the drawings.
[0017] FIG. 1 is a schematic diagram of an exploded structure of a
battery pack case and a unit cell according to an embodiment of the
present application;
[0018] FIG. 2 is a schematic diagram of the overall structure of a
battery pack case according to an embodiment of the present
application;
[0019] FIG. 3 is a schematic diagram of a combined structure of a
first insulating strip, a first side insulating strip, and a second
side insulating strip according to an embodiment of the present
application;
[0020] FIG. 4 is a schematic diagram of the overall structure of a
first insulating buffer sheet according to an embodiment of the
present application;
[0021] FIG. 5 is a schematic diagram of the overall structure of a
second insulating buffer sheet according to an embodiment of the
present application.
[0022] In the drawings, the drawings are not drawn to actual scale.
[0023] 1. battery pack case; [0024] 2. bottom plate; [0025] 3. side
plate; [0026] 4. first insulating strip; [0027] 5. glue receiving
groove; [0028] 6. second insulating strip; [0029] 7. first side
insulating strip; 7a. first long side; 7b. second long side; [0030]
8. second side insulating strip; [0031] 9. first insulating buffer
sheet; 9a. first connection section; 9b. second connection section;
[0032] 10. second insulating buffer sheet; 101. first covering
sheet; 102. second covering sheet; 103. third covering sheet; 104.
fourth covering sheet; [0033] 99. unit cell; [0034] 100.
double-sided adhesive; [0035] X length direction; Y width
direction.
DETAILED DESCRIPTION
[0036] The implementation of the present application will be
described in further detail below with reference to the drawings
and examples. The detailed description and drawings of the
following embodiments are used to exemplarily illustrate the
principle of the present application, but cannot be used to limit
the scope of the present application, that is, the present
application is not limited to the described embodiments.
[0037] In the description of the present application, it need be
noted that, unless otherwise stated, the meaning of "plurality" is
two or more; orientations or positional relationships indicated by
the terms "upper", "lower", "left", "right", "inner", "outside",
etc. are only for the convenience of describing the present
application and simplifying the description, rather than indicating
or implying that the device or element referred to must include a
specific orientation, be constructed and operated in a specific
orientation, and therefore cannot be understood as a limitation to
the present application. In addition, the terms "first", "second",
etc. are used for descriptive purposes only, and cannot be
understood as indicating or implying relative importance.
[0038] In the description of the present application, it need also
be noted that, unless otherwise clearly specified and limited, the
terms "install", "be connected with", and "connect" should be
understood in a broad sense, for example, it can be fixed connected
or detachably connected, or integrally connected; it can be either
directly connected or indirectly connected through an intermediary.
For those of ordinary skill in the art, the specific meanings of
the above terms in the present application may be understood
according to specific circumstances.
[0039] In order to better understand the present application, the
battery pack case of the embodiment of the present application will
be described in detail below with reference to FIGS. 1 to 5.
[0040] FIG. 1 schematically shows an exploded structure of a
battery pack case 1 and a unit cell 99 according to an embodiment
of the present application. FIG. 2 schematically shows the overall
structure of the battery pack case 1 according to an embodiment of
the present application. FIG. 3 schematically shows the combined
structure of the first insulating strip 4, the first side
insulating strip 7 and the second side insulating strip 8 according
to an embodiment of the present application. FIG. 4 schematically
shows the overall structure of the first insulating buffer sheet 9
according to an embodiment of the present application. FIG. 5
schematically shows the overall structure of the second insulating
buffer sheet 10 according to an embodiment of the present
application.
[0041] As shown in FIG. 1, the battery pack case 1 of the present
application is used to accommodate a unit cell 99 to form
protection for the unit cell 99. At the same time, it can also
accommodate the wiring harness or other electronic components
related to the use of the unit cell 99 and protect them. The unit
cell 99 of the present embodiment may be a square battery.
[0042] The battery pack case 1 of the embodiment of the present
application includes a bottom plate 2 and a side plate 3 connected
to the bottom plate 2. The bottom plate 2 and the side plate 3
surround to form an accommodating portion for accommodating the
unit cell 99. The unit cell 99 is put into the battery pack case 1
through the opening of the accommodating portion. A surface of the
bottom plate 2 of the present embodiment facing the accommodating
portion is provided with a plurality of first insulating strips 4.
The plurality of first insulating strips 4 are sequentially spaced
along the length direction X or the width direction Y of the bottom
plate 2. A glue receiving groove 5 is formed between two adjacent
first insulating strips 4.
[0043] On the one hand, when the unit cell 99 is installed and
fixed in the battery pack case 1, the first insulating strip 4
isolates the unit cell 99 from the bottom plate 2 to maintain a
predetermined distance between the unit cell 99 and the bottom
plate 2. In this way, effective insulation can be maintained
between the unit cell 99 and the bottom plate 2 to avoid the
occurrence of an abnormal insulation alarm caused by the unit cell
99 directly contacting the bottom plate 2 and also avoid the burr
on the surface of the bottom plate 2 from puncturing the housing of
the unit cell 99, thus effectively protecting the safety of the
unit cell 99. Generally, the flatness of the bottom plate 2 is
poor, which may easily cause insulation abnormality when the unit
cell 99 contacts the bottom plate 2. After the first insulating
strip 4 is provided on the bottom plate 2, the height of the first
insulating strip 4 can offset the difference of the height of the
surface of the bottom plate 2 to ensure that the tops of the
respective unit cells 99 are flush, and also effectively avoid the
surface of the bottom plate 2 from contacting the unit cell 99.
[0044] On the other hand, before the unit cell 99 is installed and
fixed, an insulating glue is filled in advance in the glue
receiving groove 5 formed between the two adjacent first insulating
strips 4. Since the thickness of the first insulating strip 4
itself can be designed as a predetermined value as needed, the
thickness of the insulating glue layer can be accurately controlled
by the thickness of the first insulating strip 4. In this way, when
the unit cell 99 is seated on the first insulating strip 4 on the
bottom plate 2, it will flatten the insulating glue under its own
gravity. The insulating glue is blocked by the first insulating
strip 4 and will not overflow in any directions so as to avoid the
insulating glue from overflowing and polluting other structural
parts. At the same time, it also avoids the waste of insulating
glue and saves costs. The insulating glue layer can form an
insulating protective layer, which further avoids the occurrence of
an abnormal insulation alarm caused by the bottom plate 2
contacting the unit cell 99, and also avoids the burr on the bottom
plate 2 from puncturing the unit cell 99.
[0045] The two adjacent first insulating strips 4 in the present
embodiment are arranged in parallel. When the unit cell 99 is
seated on the two adjacent first insulating strips 4, it can
provide stable and balanced support for the unit cell 99 and avoid
the unit cell 99 from tilting. The width of each of the glue
receiving grooves 5 formed between two adjacent first insulating
strips 4 is the same. Alternatively, the plurality of first
insulating strips 4 are arranged in parallel at equal intervals
between each other.
[0046] As shown in FIG. 2, the battery pack case 1 of the present
embodiment further includes a plurality of second insulating strips
6. A plurality of first insulating strips 4 and each second
insulating strip 6 are arranged to intersect. A glue receiving
groove 5 is formed between two adjacent first insulating strips 4
and two adjacent second insulating strips 6. The glue receiving
groove 5 is a closed space, and the insulating glue can overflow in
the horizontal direction. Alternatively, the plurality of second
insulating strips 6 are arranged in parallel at intervals between
two adjacent second insulating strips 6. Further, the plurality of
second insulating strips 6 are arranged in parallel at equal
intervals between two adjacent second insulating strips 6. The
plurality of first insulating strips 4 and the plurality of second
insulating strips 6 form a grid-like structure, which can
effectively support the unit cell 99 and prevent the unit cell 99
from contacting the bottom plate 2. Alternatively, the first
insulating strip 4 and the second insulating strip 6 are
perpendicular to each other.
[0047] In one embodiment, both the first insulating strip 4 and the
second insulating strip 6 are connected and fixed to the bottom
plate 2 by means of bonding. Alternatively, a double-sided adhesive
100 is provided on the first insulating strip 4 and the second
insulating strip 6 so as to conveniently and quickly bond the first
insulating strip 4 and the second insulating strip 6 to the bottom
plate 2.
[0048] As shown by combining FIG. 2 and FIG. 3, the battery pack
case 1 of the present embodiment further includes a first side
insulating strip 7. The first side insulating strip 7 extends along
the length direction X of the bottom plate 2 and covers the
connection between the long side of the bottom plate 2 and the side
plate 3. The bottom plate 2 includes two opposite long sides. One
first side insulating strip 7 is provided between each long side
and the side plate 3. The first side insulating strip 7 can
effectively isolate the unit cell 99 from the side plate 3 to avoid
the insulation abnormality caused by the unit cell 99 contacting
the side plate 3, and meanwhile also avoid the burrs on the side
plate 3 from puncturing the unit cell 99.
[0049] Alternatively, the first side insulating strip 7 includes a
first long side 7a and a second long side 7b. The first long side
7a is connected to the side plate 3, and the second long side 7b is
connected to the bottom plate 2. The first long side 7a and the
second long side 7b are perpendicular to each other, so that the
entire cross section of the first side insulating strip 7 includes
an L-shaped structure.
[0050] Alternatively, the first side insulating strip 7 is
connected and fixed to the battery pack case 1 by means of bonding.
In one example, the double-sided adhesive 100 is provided on both
the first long side 7a and the second long side 7b, so that the
first long side 7a is easily and quickly bonded to the side plate
3, and the second long side 7b is bonded to the bottom plate 2.
When the first insulating strips 4 are sequentially spaced along
the length direction X of the bottom plate 2, all the first
insulating strips 4 are disposed between the two first side
insulating strips 7. One end of each first insulating strip 4 is
connected to one first side insulating strip 7, and the other end
of each first insulating strip 4 is connected to another first side
insulating strip 7.
[0051] The battery pack case 1 of the present embodiment further
includes a second side insulating strip 8. The second side
insulating strip 8 extends along the width direction Y of the
bottom plate 2 and is provided on the wide side of the bottom plate
2 connected to the side plate 3. The bottom plate 2 includes two
opposite wide sides. One second side insulating strip 8 is provided
on each wide side. When the first insulating strips 4 are
sequentially spaced along the width direction Y of the bottom plate
2, all the first insulating strips 4 are disposed between the two
second side insulating strips 8. One end of each first insulating
strip 4 is connected to one second side insulating strip 8, and the
other end of each first insulating strip 4 is connected to another
second side insulating strip 8.
[0052] Alternatively, the bottom plate 2 and the side plate 3 are
steel structures. The first insulating strip 4, the second
insulating strip 6, the first side insulating strip 7 and the
second side insulating strip 8 are all plastic or insulating
resin.
[0053] The battery pack case 1 of the embodiment of the present
application includes a bottom plate 2 capable of supporting the
unit cell 99 and a side plate 3 connected to the bottom plate 2. A
plurality of first insulating strips 4 with good insulation
performance are provided on the bottom plate 2. The first
insulating strip 4 is provided between the bottom of the unit cell
99 and the bottom plate 2 and can isolate the unit cell 99 from the
bottom plate 2 to maintain a predetermined distance between the two
and insulate from each other to avoid the occurrence of abnormal
insulation caused by contacting between them, which causes
electrical connection between the two and causes a danger of short
circuit and fire. A glue receiving groove 5 is formed between two
adjacent first insulating strips 4 to facilitate filling a
predetermined amount of insulating glue. The first insulating strip
4 can prevent the insulating glue from overflowing. The first
insulating strip 4 can control the thickness of the insulating glue
layer through its own thickness, thereby ensuring a flat surface of
the insulating glue and also avoiding waste of the insulating
glue.
[0054] An embodiment of the present application further proposes a
battery pack, which includes a battery pack case 1 and a plurality
of battery assemblies provided in the battery pack case 1. The
battery pack can provide power for the electrical equipment. A
plurality of battery assemblies are arranged side by side along the
width direction Y of the bottom plate 2. Each battery assembly
includes a plurality of unit cells 99 arranged side by side along
the length direction X of the bottom plate 2. The first insulating
strip 4 is provided between the bottom of the battery assembly and
the bottom plate 2. Since the first insulating strip 4 insulates
and isolates the unit cell 99 from the bottom plate 2, the unit
cell 99 will not contact with the bottom plate 2, so that the
overall safety of the battery pack is good and the working process
is stable.
[0055] As shown by combining FIG. 1 and FIG. 4, the battery pack of
the present embodiment further includes a first insulating buffer
sheet 9. The first insulating buffer sheet 9 extends in the length
direction X of the bottom plate 2. The first insulating buffer
sheet 9 is provided between the battery assembly adjacent to the
side plate 3 and the battery pack case 1. The length of the first
insulating buffer sheet 9 may be equal to the length of the battery
assembly. The first insulating buffer sheet 9 can insulate and
isolate the unit cell 99 from the battery pack case 1 to avoid the
unit cell 99 from contacting with the battery pack case 1 or the
unit cell 99 from being punctured by the bur on the battery pack
case 1. The first insulating buffer sheet 9 can be deformed to a
certain extent by being squeezed by the unit cell 99, so as to keep
the unit cell 99 and the bottom plate 2 tight therebetween, and
avoid the occurrence of gaps that may cause the position of the
unit cell 99 unstable. Alternatively, the material of the first
insulating buffer sheet 9 is plastic or rubber.
[0056] In one embodiment, the first insulating buffer sheet 9
includes a first connection section 9a and a second connection
section 9b that intersect. The first connection section 9a is
bonded to the surface of the battery assembly facing the side plate
3. The first connection section 9a is used to isolate the side
surface of the battery assembly from the side plate 3. Optionally,
a double-sided adhesive 100 is provided on the first connection
section 9a, so that the first connection section 9a is conveniently
and quickly bonded to the side surface of the battery assembly in
the width direction Y. The second connection section 9b is
positioned between the bottom of the battery assembly and the
bottom plate 2. The second connection section 9b is used to isolate
the bottom of the battery assembly from the bottom plate 2.
Alternatively, a double-sided adhesive 100 is provided on the
second connection section 9b, so that the second connection section
9b is conveniently and quickly bonded to the bottom surface of the
battery assembly, which improves connection strength of the first
insulating buffer sheet 9 and is not prone to falling off.
Alternatively, the first connection section 9a and the second
connection section 9b may be perpendicular to each other.
[0057] As shown in FIG. 1 and FIG. 5, the battery pack case 1 of
the present embodiment further includes a second insulating buffer
sheet 10. The second insulating buffer sheet 10 extends in the
width direction Y of the bottom plate 2. In the length direction X
of the battery assembly, a second insulating buffer sheet 10 is
provided between the bottom of the two unit cells 99 positioned on
the outermost side of the battery assembly and the battery pack
case 1. The second insulating buffer sheet 10 can isolate the two
unit cells 99 on the outermost side in the battery assembly from
the battery pack case 1 to avoid the unit cells 99 from contacting
with the battery pack case 1 or the unit cells 99 from being
punctured by the bur on the battery pack case 1. The length of the
second insulating buffer sheet 10 may be equal to the width of the
battery assembly. The second insulating buffer sheet 10 deforms to
a certain extent by being squeezed by the unit cell 99, so as to
keep the unit cell 99 and the battery pack case 1 tight
therebetween, and avoid the occurrence of gaps therebetween that
may cause the position of the unit cell 99 unstable. Alternatively,
the material of the second insulating buffer sheet 10 is plastic or
rubber.
[0058] In one embodiment, the second insulating buffer sheet 10
includes an accommodating recess. A part of the bottom of the unit
cell 99 is inserted into the accommodating recess, and the inserted
part is covered by the second insulating buffer sheet 10. In one
embodiment, the second insulating buffer sheet 10 includes a first
covering sheet 101 and a second covering sheet 102 that are
perpendicular to each other and extend along the width direction Y
of the bottom plate 2, and a third covering sheet 103 and a fourth
covering sheet 104 which are connected to the first covering sheet
101 and the second covering sheet 102 at the same time. The third
covering sheet 103 is perpendicular to the first covering sheet 101
and the second covering sheet 102 at the same time. The fourth
covering sheet 104 is perpendicular to the first covering sheet 101
and the second covering sheet 102 at the same time. The third
covering sheet 103 and the fourth covering sheet 104 are arranged
to be parallel. The third covering sheet 103 is provided at one end
of the first covering sheet 101 and the second covering sheet 102.
The fourth covering sheet 104 is disposed at the other end of the
first covering sheet 101 and the second covering sheet 102. The
first covering sheet 101, the second covering sheet 102, the third
covering sheet 103, and the fourth covering sheet 104 form the
accommodating recess. The first cover sheet 101 is bonded to the
side surface of the battery assembly in the length direction X, and
the second cover sheet 102 is attached to the bottom of the unit
cell 99. The third cover sheet 103 is attached to one of the two
opposite side surfaces of the unit cell 99 along in the width
direction Y of the bottom plate 2. The fourth cover sheet 104 is
attached to the other of the two opposite side surfaces of the unit
cell 99 along the width direction Y of the bottom plate 2.
Alternatively, a double-sided adhesive 100 is provided on the third
covering sheet 103 so as to bond conveniently and quickly the
second insulating buffer sheet 10 to the side surface of the unit
cell 99.
[0059] The battery pack of the present embodiment further includes
an insulating glue layer (not shown in the figures). The insulating
glue layer is disposed in the glue receiving groove 5. The battery
assembly is connected and fixed to the bottom plate 2 through the
insulating glue layer. The insulating glue layer can form an
insulating protective layer, which further avoids the insulation
abnormality alarm from occurring when due to the bottom plate 2
contacting the unit cell 99, and also avoids the burr on the bottom
plate 2 from puncturing the unit cell 99.
[0060] Although the present application has been described with
reference to the preferred embodiments, various improvements can be
made and components therein can be replaced with equivalents
without departing from the scope of the present application. In
particular, as long as there is no structural conflict, the
technical features mentioned in the various embodiments can be
combined in any way. The present application is not limited to the
specific embodiments disclosed herein, but includes all technical
solutions falling within the scope of the claims.
* * * * *