U.S. patent application number 15/457778 was filed with the patent office on 2017-10-05 for wound-type cell and winding mandrel.
The applicant listed for this patent is NINGDE AMPEREX TECHNOLOGY LIMITED. Invention is credited to Jiacai CAI, Yu LUO, Kefei WANG, Qiao ZENG.
Application Number | 20170288274 15/457778 |
Document ID | / |
Family ID | 59961949 |
Filed Date | 2017-10-05 |
United States Patent
Application |
20170288274 |
Kind Code |
A1 |
ZENG; Qiao ; et al. |
October 5, 2017 |
WOUND-TYPE CELL AND WINDING MANDREL
Abstract
The present disclosure provides a wound-type cell and a winding
mandrel. The wound-type cell comprises: a first electrode plate
having a blank first current collector which is positioned at a
first winding start end and is not coated with the first active
material layer; a second electrode plate having a blank second
current collector which is positioned at a second winding start end
and is not coated with the second active material layer, and the
blank second current collector is positioned at an inner side of
the blank first current collector; a separator; a first electrode
tab; and a second electrode tab. A first end of the blank first
current collector is beyond a second end of the blank second
current collector in a length direction, and a position of the
first electrode tab is beyond the second end of the blank second
current collector in the length direction.
Inventors: |
ZENG; Qiao; (Ningde, CN)
; WANG; Kefei; (Ningde, CN) ; CAI; Jiacai;
(Ningde, CN) ; LUO; Yu; (Ningde, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NINGDE AMPEREX TECHNOLOGY LIMITED |
Ningde |
|
CN |
|
|
Family ID: |
59961949 |
Appl. No.: |
15/457778 |
Filed: |
March 13, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01M 10/0409 20130101;
H01M 10/0525 20130101; Y02E 60/10 20130101; H01M 2/263 20130101;
H01M 10/0431 20130101; H01M 10/0587 20130101 |
International
Class: |
H01M 10/0587 20060101
H01M010/0587; H01M 10/04 20060101 H01M010/04; H01M 2/26 20060101
H01M002/26; H01M 10/0525 20060101 H01M010/0525 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 31, 2016 |
CN |
201610195191.0 |
Claims
1.-16. (canceled)
17. A wound-type cell, comprising: a first electrode plate having a
first current collector and a first active material layer coated on
a surface of the first current collector, and the first electrode
plate further having a blank first current collector which is
positioned at a first winding start end and is not coated with the
first active material layer; a second electrode plate having a
second current collector and a second active material layer coated
on a surface of the second current collector, and the second
electrode plate further having a blank second current collector
which is positioned at a second winding start end and is not coated
with the second active material layer, and the blank second current
collector being positioned at an inner side of the blank first
current collector in a thickness direction; a separator provided
between the first electrode plate and the second electrode plate to
separate the first electrode plate from the second electrode plate;
a first electrode tab electrically connected to the blank first
current collector; and a second electrode tab electrically
connected to the blank second current collector; wherein a first
end of the blank first current collector is beyond a second end of
the blank second current collector in a length direction, and a
position of the first electrode tab is beyond the second end of the
blank second current collector in the length direction; at least a
part of a third winding start end of the separator is folded back
to an inner side in the thickness direction and is positioned
between the first electrode tab and the second electrode tab in the
length direction.
18. The wound-type cell according to claim 17, wherein the third
winding start end of the separator is formed by two layers in the
thickness direction.
19. The wound-type cell according to claim 17, wherein the first
electrode plate is a positive electrode plate and the second
electrode plate is a negative electrode plate.
20. The wound-type cell according to claim 17, wherein a thickness
of the first electrode tab is more than a thickness of the first
current collector; a thickness of second electrode tab is more than
a thickness of the second current collector.
21. The wound-type cell according to claim 17, wherein a side of
the second current collector which directly faces the blank first
current collector is not coated with the second active material
layer.
22. The wound-type cell according to claim 17, wherein a side of
the first current collector which directly faces the blank second
current collector is not coated with the first active material
layer.
23. The wound-type cell according to claim 17, wherein an inner
side of an arc-shaped portion of the second current collector which
directly faces the first end of the blank first current collector
is not coated with the second active material layer.
24. A winding mandrel, used for winding the wound-type cell
according to claim 17, wherein the winding mandrel comprises a
first winding mandrel and a second winding mandrel which are
sequentially provided along the length direction, a first end
surface of the first winding mandrel and a second end surface of
the second winding mandrel face each other and form a clamping
groove; an end of the first end surface which is close to the blank
second current collector is beyond an end of the first end surface
which is away from the blank second current collector in the length
direction; an end of the second end surface which is close to the
blank second current collector is beyond an end of the second end
surface which is away from the blank second current collector in
the length direction.
25. The winding mandrel according to claim 24, wherein the first
end surface and the second end surface are parallel to each
other.
26. The winding mandrel according to claim 25, wherein an angle
between the first end surface and a first side surface of the first
winding mandrel which is close to the blank second current
collector is between 20 degrees and 70 degrees; an angle between
the second end surface and a second side surface of the second
winding mandrel which is close to the blank second current
collector is between 160 degrees and 110 degrees.
27. The winding mandrel according to claim 24, wherein the third
winding start end of the separator is formed by two layers in the
thickness direction.
28. The winding mandrel according to claim 24, wherein the first
electrode plate is a positive electrode plate and the second
electrode plate is a negative electrode plate.
29. The winding mandrel according to claim 24, wherein a thickness
of the first electrode tab is more than a thickness of the first
current collector; a thickness of second electrode tab is more than
a thickness of the second current collector.
30. The winding mandrel according to claim 24, wherein a side of
the second current collector which directly faces the blank first
current collector is not coated with the second active material
layer.
31. The winding mandrel according to claim 24, wherein a side of
the first current collector which directly faces the blank second
current collector is not coated with the first active material
layer.
32. The winding mandrel according to claim 24, wherein an inner
side of an arc-shaped portion of the second current collector which
directly faces the first end of the blank first current collector
is not coated with the second active material layer.
Description
REFERENCE To RELATED APPLICATIONS
[0001] The present application claims priority to Chinese patent
application No. 201610195191.0, filed on Mar. 31, 2016, which is
incorporated herein by reference in its entirety.
FIELD OF THE PRESENT DISCLOSURE
[0002] The present disclosure relates to the field of battery, and
particularly relates to a wound-type cell and a winding
mandrel.
BACKGROUND OF THE PRESENT DISCLOSURE
[0003] With the commercial development of Lithium-ion cell, the
requirement of market on energy density of the Lithium-ion cell is
becoming higher and higher. Referring to FIG. 1, at a winding start
end of a conventional wound-type cell, a blank positive current
collector 111 (Al foil) is shorter than a blank negative current
collector 211 (Cu foil) which is positioned at an inner side of the
blank positive current collector 111, so the inside of the
wound-type cell needs to redundantly wind a part of separator 3
which is positioned between the blank positive current collector
111 and the blank negative current collector 211 and is beyond the
blank positive current collector 111 and the blank negative current
collector 211, and this will not only lead to the waste of
separator, but also increase a thickness of the wound-type cell and
reduce the energy density of the wound-type cell.
SUMMARY OF THE PRESENT DISCLOSURE
[0004] In view of the problem existing in the background, an object
of the present disclosure is to provide a wound-type cell and a
winding mandrel, which can reduce a usage amount of a separator and
a thickness of the wound-type cell, and improve the energy density
of the wound-type cell.
[0005] In order to achieve the above object, in a first aspect, the
present disclosure provides a wound-type cell, which comprises: a
first electrode plate having a first current collector and a first
active material layer coated on a surface of the first current
collector, and the first electrode plate further has a blank first
current collector which is positioned at a first winding start end
and is not coated with the first active material layer; a second
electrode plate having a second current collector and a second
active material layer coated on a surface of the second current
collector, and the second electrode plate further has a blank
second current collector which is positioned at a second winding
start end and is not coated with the second active material layer,
and the blank second current collector is positioned at an inner
side of the blank first current collector in a thickness direction;
a separator provided between the first electrode plate and the
second electrode plate to separate the first electrode plate from
the second electrode plate; a first electrode tab electrically
connected to the blank first current collector; and a second
electrode tab electrically connected to the blank second current
collector. A first end of the blank first current collector is
beyond a second end of the blank second current collector in a
length direction, and a position of the first electrode tab is
beyond the second end of the blank second current collector in the
length direction; at least a part of a third winding start end of
the separator is folded back to an inner side in the thickness
direction and is positioned between the first electrode tab and the
second electrode tab in the length direction.
[0006] In order to achieve the above object, in a second aspect,
the present disclosure provides a winding mandrel, which is used
for winding the wound-type cell according to the first aspect of
the present disclosure, the winding mandrel comprises a first
winding mandrel and a second winding mandrel which are sequentially
provided along the length direction, a first end surface of the
first winding mandrel and a second end surface of the second
winding mandrel face each other and form a clamping groove; an end
of the first end surface which is close to the blank second current
collector is beyond an end of the first end surface which is away
from the blank second current collector in the length direction; an
end of the second end surface which is close to the blank second
current collector is beyond an end of the second end surface which
is away from the blank second current collector in the length
direction.
[0007] The present disclosure has the following beneficial effects:
in the wound-type cell and the winding mandrel according to the
present disclosure, because a length of the blank second current
collector is reduced, there is no need to redundantly wind the
third winding start end of the separator in large length as in the
prior art, thereby reducing a usage amount of the separator and the
cost of the separator. In addition, because the third winding start
end is positioned between the first electrode tab and the second
electrode tab in the length direction, a thickness of the third
winding start end of the separator will not be overlapped with a
thickness of the first electrode tab and a thickness of the second
electrode tab, thereby reducing a thickness of the wound-type cell
and improve the energy density of the wound-type cell. At the same
time, it is easy to realize automatic production of the wound-type
cell of the present disclosure.
BRIEF DESCRIPTION OF THE FIGURES
[0008] FIG. 1 is a schematic view of a wound-type cell and a
winding mandrel of the prior art.
[0009] FIG. 2 is a schematic view of a wound-type cell and a
winding mandrel according to the present disclosure, in which a
first winding start end, a second winding start end and a third
winding start end each are indicated by a dotted line frame.
[0010] FIG. 3 is a schematic view of the wound-type cell according
to the present disclosure, in which the first winding start end,
the second winding start end and the third winding start end each
are indicated by a dotted line frame.
REFERENCE NUMERALS ARE REPRESENTED AS FOLLOWS
[0011] 1 first electrode plate [0012] 11 first current collector
[0013] 111 blank first current collector [0014] 111E first end
[0015] 12 first active material layer [0016] 2 second electrode
plate [0017] 21 second current collector [0018] 211 blank second
current collector [0019] 211E second end [0020] 22 second active
material layer [0021] 3 separator [0022] 4 first electrode tab
[0023] 5 second electrode tab [0024] E1 first winding start end
[0025] E2 second winding start end [0026] E3 third winding start
end [0027] C arc-shaped portion [0028] S1 first winding mandrel
[0029] S11 first end surface [0030] S12 first side surface [0031]
S2 second winding mandrel [0032] S21 second end surface [0033] S22
second side surface [0034] G clamping groove [0035] L length
direction [0036] T thickness direction
DETAILED DESCRIPTION
[0037] Hereinafter a wound-type cell and a winding mandrel
according to the present disclosure will be described in detail in
combination with the figures.
[0038] Firstly, a wound-type cell according to a first aspect of
the present disclosure will be described.
[0039] Referring to FIG. 2 and FIG. 3, a wound-type cell according
to the present disclosure comprises: a first electrode plate 1
having a first current collector 11 and a first active material
layer 12 coated on a surface of the first current collector 11, and
the first electrode plate 1 further has a blank first current
collector 111 which is positioned at a first winding start end E1
and is not coated with the first active material layer 12; a second
electrode plate 2 having a second current collector 21 and a second
active material layer 22 coated on a surface of the second current
collector 21, and the second electrode plate 2 further has a blank
second current collector 211 which is positioned at a second
winding start end E2 and is not coated with the second active
material layer 22, and the blank second current collector 211 is
positioned at an inner side of the blank first current collector
111 in a thickness direction T; a separator 3 provided between the
first electrode plate 1 and the second electrode plate 2 to
separate the first electrode plate 1 from the second electrode
plate 2; a first electrode tab 4 electrically connected to the
blank first current collector 111; and a second electrode tab 5
electrically connected to the blank second current collector 211. A
first end 111E of the blank first current collector 111 is beyond a
second end 211E of the blank second current collector 211 in a
length direction L, and a position of the first electrode tab 4 is
beyond the second end 211E of the blank second current collector
211 in the length direction L; at least a part of a third winding
start end E3 of the separator 3 is folded back to an inner side in
the thickness direction T and is positioned between the first
electrode tab 4 and the second electrode tab 5 in the length
direction L.
[0040] In the wound-type cell according to the present disclosure,
because a length of the blank second current collector 211 is
reduced, there is no need to redundantly wind the third winding
start end E3 of the separator 3 in large length as in the prior
art, thereby reducing a usage amount of the separator 3 and the
cost of the separator 3. In addition, because at least a part of
the third winding start end E3, which is folded back to the inner
side in thickness direction T, is positioned between the first
electrode tab 4 and the second electrode tab 5 in the length
direction L, a thickness of the third winding start end E3 of the
separator 3 will not be overlapped with a thickness of the first
electrode tab 4 and a thickness of the second electrode tab 5 as
the cell shown in FIG. 1, thereby reducing a thickness of the
wound-type cell and improve the energy density of the wound-type
cell. At the same time, it is easy to realize automatic production
of the wound-type cell of the present disclosure.
[0041] In an embodiment of the wound-type cell according to the
present disclosure, referring to FIG. 3, the third winding start
end E3 of the separator 3 is formed by two layers in the thickness
direction T. The third winding start end E3 is a part of one layer
and a part of the other layer which are clamped in a clamping
groove G of a later mentioned winding mandrel; in the formed
wound-type cell, the third winding start end E3 of the separator 3
is two layers, preferably, the two layers are attached
together.
[0042] In an embodiment of the wound-type cell according to the
present disclosure, the first electrode plate 1 may be a positive
electrode plate or a negative electrode plate, correspondingly, the
second electrode plate 2 may be a negative electrode plate or a
positive electrode plate. Preferably, the first electrode plate 1
is a positive electrode plate and the second electrode plate 2 is a
negative electrode plate, correspondingly, the first active
material layer 12 is a positive active material layer, and
specifically, the first active material layer 12 may be selected
from at least one of lithium cobalt oxide (LiCoO.sub.2), lithium
ferric phosphate (LiFePO.sub.4) and lithium manganese oxide
(LiMn.sub.2O.sub.4). The second active material layer 22 is a
negative active material layer, and specifically, the second active
material layer 22 may be selected from at least one of carbon and
silicon.
[0043] In an embodiment of the wound-type cell according to the
present disclosure, the first current collector 11 is an aluminum
foil, the second current collector 21 is a copper foil.
[0044] In an embodiment of the wound-type cell according to the
present disclosure, the first electrode tab 4 is fixed to the blank
first current collector 111 by welding.
[0045] In an embodiment of the wound-type cell according to the
present disclosure, the second electrode tab 5 is fixed to the
blank second current collector 211 by welding.
[0046] In an embodiment of the wound-type cell according to the
present disclosure, the welding is laser welding, ultrasonic
welding or resistance welding.
[0047] In an embodiment of the wound-type cell according to the
present disclosure, the thickness of the first electrode tab 4 is
more than a thickness of the first current collector 11. This can
ensure a connection strength and an overcurrent sectional area of
the first electrode tab 4.
[0048] In an embodiment of the wound-type cell according to the
present disclosure, the thickness of second electrode tab 5 is more
than a thickness of the second current collector 21. This can
ensure a connection strength and an overcurrent sectional area of
the second electrode tab 5.
[0049] In an embodiment of the wound-type cell according to the
present disclosure, referring to FIG. 2 and FIG. 3, a side of the
second current collector 21 which directly faces the blank first
current collector 111 is not coated with the second active material
layer 22. Because the blank first current collector 111 is not
coated with the first active material layer 12, if the side of the
second current collector 21 which directly faces the blank first
current collector 111 is coated with the second active material
layer 22, it is not only helpless to the capacity (lithium-ions
cannot realize the reciprocating process of intercalation and
deintercalation between the blank first current collector 111 and
the second current collector 21 that directly faces the blank first
current collector 111) but also increases the thickness of the
wound-type cell and reduces the energy density of the wound-type
cell. Therefore, the side of the second current collector 21 which
directly faces the blank first current collector 111 may be not
coated with the second active material layer 22, and this will
avoid waste in material and improve the energy density of the
wound-type cell.
[0050] In an embodiment of the wound-type cell according to the
present disclosure, referring to FIG. 2 and FIG. 3, a side of the
first current collector 11 which directly faces the blank second
current collector 211 is not coated with the first active material
layer 12. Because the blank second current collector 211 is not
coated with the second active material layer 22, if the side of the
first current collector 11 which directly faces the blank second
current collector 211 is coated with the first active material
layer 12, it is not only helpless to the capacity (lithium-ion
cannot realize the reciprocating process of intercalation and
deintercalation between the blank second current collector 211 and
the first current collector 11 which directly faces the blank
second current collector 211) but also increases the thickness of
the wound-type cell and reduces the energy density of the
wound-type cell. Therefore, the side of the first current collector
11 which directly faces the blank second current collector 211 may
be not coated with the first active material layer 12, and this
will avoid waste in material and improve the energy density of the
wound-type cell.
[0051] In an embodiment of the wound-type cell according to the
present disclosure, referring to FIG. 2 and FIG. 3, an inner side
of an arc-shaped portion C of the second current collector 21 which
directly faces the first end 111E of the blank first current
collector 111 is not coated with the second active material layer
22. Because the first end 111E of the blank first current collector
111, which directly faces the inner side of the arc-shaped portion
C of the second current collector 21, is not coated with the first
active material layer 12, if the inner side of the arc-shaped
portion C is coated with the second active material layer 22, it is
not only helpless to the capacity (lithium-ion cannot realize the
reciprocating process of intercalation and deintercalation between
the inner side of the arc-shaped portion C of the second current
collector 21 and the first end 111E of the blank first current
collector 111) but also increases the thickness of the wound-type
cell and reduces the energy density of the wound-type cell.
Therefore, the inner side of the arc-shaped portion C may be not
coated with the second active material layer 22, and this will
avoid waste in material and improve the energy density of the
wound-type cell.
[0052] Secondly, a winding mandrel according to a second aspect of
the present disclosure will be described.
[0053] Referring to FIG. 2, a winding mandrel according to a second
aspect of the present disclosure is used for winding the wound-type
cell according to the first aspect of the present disclosure, the
winding mandrel comprises a first winding mandrel S1 and a second
winding mandrel S2 which are sequentially provided along the length
direction L, a first end surface S11 of the first winding mandrel
S1 and a second end surface S21 of the second winding mandrel S2
face each other and form a clamping groove G; an end of the first
end surface S11 which is close to the blank second current
collector 211 is beyond an end of the first end surface S11 which
is away from the blank second current collector 211 in the length
direction L; correspondingly, an end of the second end surface S21
which is close to the blank second current collector 211 is beyond
an end of the second end surface S21 which is away from the blank
second current collector 211 in the length direction L.
[0054] In an embodiment of the wound-type cell according to the
present disclosure, referring to FIG. 2, the first end surface S11
and the second end surface S21 are parallel to each other.
[0055] In an embodiment of the wound-type cell according to the
present disclosure, referring to FIG. 2, an angle between the first
end surface S11 and a first side surface S12 of the first winding
mandrel S1 which is close to the blank second current collector 211
is between 20 degrees and 70 degrees; correspondingly, an angle
between the second end surface S21 and a second side surface S22 of
the second winding mandrel S2 which is close to the blank second
current collector 211 is between 160 degrees and 110 degrees.
* * * * *