CN107302110B - Winding type battery cell - Google Patents
Winding type battery cell Download PDFInfo
- Publication number
- CN107302110B CN107302110B CN201610237344.3A CN201610237344A CN107302110B CN 107302110 B CN107302110 B CN 107302110B CN 201610237344 A CN201610237344 A CN 201610237344A CN 107302110 B CN107302110 B CN 107302110B
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- Prior art keywords
- current collector
- pole piece
- winding
- tab
- active material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a winding type battery cell, which comprises: a first electrode sheet having a first current collector and a first active material layer coated on the first current collector; a second pole piece having a second current collector and a second active material layer coated on the second current collector, the second winding start section of the second pole piece having a blank second current collector; an isolation film isolating the first pole piece from the second pole piece; the first tab is electrically connected with the first current collector; and the second lug is fixed on the blank second current collector. The first winding initiation section of the first pole piece includes: the main body part is positioned outside the second winding initial section, and the length of the main body part is longer than that of the second winding initial section; a folded portion inside the main body portion, the folded portion not overlapping the second tab in a thickness direction; the reverse folded part is provided with a blank first current collector. The position of the first tab exceeds the end part of the second winding initial section; the third winding initial section of the isolating film is folded back inwards and is positioned between the first tab and the second tab.
Description
Technical Field
The invention relates to the field of batteries, in particular to a winding type battery cell.
Background
With the development of commercialization of lithium ion batteries, the energy density of the lithium ion batteries is increasingly required by the market. Referring to fig. 1, a blank positive electrode current collector 111 (Al foil) of the head of a conventional wound battery cell is shorter than a negative electrode current collector 211 (Cu foil), and an empty winding of two layers of insulation films 3 (the insulation film surrounded by a dummy frame in fig. 1 is the empty winding insulation film) is required inside the wound battery cell, which not only causes waste of the insulation films 3, but also causes the insulation films 3 to overlap with the positive electrode tab 4 and the negative electrode tab 5 in the thickness direction T, thereby increasing the thickness of the battery cell and reducing the energy density of the battery cell.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide a winding type battery cell, which can reduce the use amount of a separator and a gummed paper, reduce the thickness of the winding type battery cell, and improve the energy density of the winding type battery cell.
In order to achieve the above object, the present invention provides a winding type battery cell, comprising: a first electrode sheet having a first current collector and a first active material layer coated on at least one surface of the first current collector; a second pole piece having a second current collector and a second active material layer coated on at least one surface of the second current collector, a second winding start section of the second pole piece having a blank second current collector without the second active material layer coated thereon; the isolating film is arranged between the first pole piece and the second pole piece to isolate the first pole piece from the second pole piece; the first tab is electrically connected with the first current collector; and the second lug is fixed on the blank second current collector.
Wherein the first winding initiation section of the first pole piece comprises: the main body part is positioned at the outer side of the second winding initial section along the thickness direction, and the length of the main body part along the length direction is longer than that of the second winding initial section along the length direction; and a reverse folded portion connected to the main body portion and located inside the main body portion in the thickness direction, the reverse folded portion not overlapping the second tab in the thickness direction; the reverse turn has a blank first current collector that is not coated with a first active material layer.
In the length direction, the position of the first tab exceeds the end part of the second winding starting section; at least a part of the third winding start section of the separator is folded back to the inner side in the thickness direction, and the third winding start section folded back to the inner side in the thickness direction is located between the first tab and the second tab in the length direction.
The beneficial effects of the invention are as follows:
in the winding type battery cell according to the invention, the second winding initial section is smaller than the length of the main body part, so that the third winding initial section of the isolating film does not need to be an empty roll with a length as large as that of the prior art, thereby reducing the use amount of the isolating film and lowering the cost. In addition, the third winding initial section of the isolating film is located between the first tab and the second tab in the length direction, so that the thickness of the third winding initial section of the isolating film is not overlapped with the thickness of the first tab and the second tab, the thickness of the winding type battery cell is reduced, and the energy density of the winding type battery cell is improved. Meanwhile, the coiled battery cell can realize automatic production; in addition, because the reverse folded part is not overlapped with the second lug in the thickness direction, the thickness of the battery cell is not increased by the reverse folded part, and the end part of the reverse folded part is only opposite to the second lug in the thickness direction, so that the adhesive tape is only required to be adhered on the side, and the other side is opposite to the main body part, and the adhesive tape is not required to be adhered.
Drawings
FIG. 1 is a schematic diagram of a prior art coiled cell;
fig. 2 is a schematic diagram of an embodiment of a coiled electrical cell according to the present invention, wherein the first, second, and third winding start sections are indicated by dashed boxes;
fig. 3 is a schematic view of another embodiment of a coiled electrical cell according to the present invention, wherein the first, second, and third winding start sections are all indicated by dashed boxes;
fig. 4 is a schematic view of a further embodiment of a wound cell according to the present invention, wherein the first winding initiation section, the second winding initiation section, and the third winding initiation section are all indicated by dashed boxes;
fig. 5 is a schematic view of a further embodiment of a coiled electrical cell according to the present invention, wherein the first, second and third winding start sections are indicated by dashed boxes;
fig. 6 is a schematic view of an embodiment of a wound cell forming a first tab according to the present invention, wherein the first active material layer is not referred to on the first current collector for clarity;
fig. 7 is a schematic view of another embodiment of a wound cell forming a first tab according to the present invention, wherein the first active material layer is not referred to on the first current collector for clarity;
fig. 8 is a schematic diagram of the formation of a wound cell according to the present invention.
Wherein reference numerals are as follows:
1. first pole piece 5 second pole lug
11. First winding start section of first current collector E1
111. Blank first current collector E11 main body part
12. First active material layer E12 reverse folded portion
13. First groove E2 second winding initiation section
2. Third winding initiation section of second pole piece E3
21. First winding needle of second current collector S1
211. Second winding needle for blank second current collector S2
22. Second active material layer G clamping groove
3. Thickness direction of the isolation film T
4. First tab L length direction
Detailed Description
The winding type battery cell of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 2 to 5, the winding type battery cell according to the present invention includes: a first pole piece 1 having a first current collector 11 and a first active material layer 12 coated on at least one surface of the first current collector 11; a second pole piece 2 having a second current collector 21 and a second active material layer 22 coated on at least one surface of the second current collector 21, the second winding start section E2 of the second pole piece 2 having a blank second current collector 211 without the second active material layer 22 coated; the isolating film 3 is arranged between the first pole piece 1 and the second pole piece 2 to isolate the first pole piece 1 from the second pole piece 2; the first tab 4 is electrically connected with the first current collector 11; the second tab 5 is fixed to the blank second current collector 211.
Wherein the first winding initiation section E1 of the first pole piece 1 comprises: a main body portion E11 located outside the second winding start section E2 in the thickness direction T, and the length of the main body portion E11 in the length direction L is greater than the length of the second winding start section E2 in the length direction L (i.e., a portion of the main body portion E11 exceeds an end of the second winding start section E2 in the length direction L); and a folded-back portion E12 connected to the main body portion E11 and located inside the main body portion E11 in the thickness direction T, the folded-back portion E12 not overlapping the second tab 5 in the thickness direction T; the reverse turn E12 has a blank first current collector 111 that is not coated with the first active material layer 12.
In the length direction L, the position of the first tab 4 exceeds the end of the second winding start section E2; at least a part of the third winding start section E3 of the separator 3 is folded back inward in the thickness direction T, and the third winding start section E3 folded back inward in the thickness direction T is located between the first tab 4 and the second tab 5 in the longitudinal direction L.
In the winding type battery cell according to the present invention, the second winding initiation section E2 is smaller than the length of the main body section E11, so that the third winding initiation section E3 of the separator 3 does not need to be an empty roll of a length as large as in the prior art, thereby reducing the amount of use of the separator 3 and reducing the cost. In addition, since the third winding start section E3 of the isolation film 3 is located between the first tab 4 and the second tab 5 in the length direction L, the thickness of the third winding start section E3 of the isolation film 3 is not overlapped with the thicknesses of the first tab 4 and the second tab 5 any more, thereby reducing the thickness of the wound battery cell and improving the energy density of the wound battery cell. Meanwhile, the coiled battery cell can realize automatic production; in addition, since the folded-back portion E12 does not overlap the second tab 5 in the thickness direction T, the folded-back portion E12 does not increase the thickness of the battery cell, and only one side of the end portion of the folded-back portion E12 is opposite to the second tab 2 in the thickness direction T, it is only necessary to paste the adhesive tape on that side (since burrs are left at the end portion of the folded-back portion E12 in actual production, the separator 3 is easily pierced to contact the second tab 2 and cause a short circuit), and the other side is opposite to the main body portion E11, so that there is no need to paste the adhesive tape.
In an embodiment of the winding type battery cell according to the present invention, one layer of the insulation film 3 is respectively disposed on the inner side and the outer side adjacent to the second winding initiation section E2 of the second electrode sheet 2 in the thickness direction T, and the two layers of the insulation film 3 each exceed the end of the second winding initiation section E2, and the two layers of the insulation film 3 exceeding the end of the second winding initiation section E2 together constitute the third winding initiation section E3 of the insulation film 3. In other words, in the finally formed wound cell, the third winding initiation section E3 of the separator 3 is composed of the separator which is not folded back beyond the end of the second winding initiation section E2 and the portion of the separator folded back inside the second winding initiation section E2 in the thickness direction T. The length of the third winding start section E3 of the separator 3 depends on the length of the wound cell, and the minimum length is 3mm or more, preferably 3mm to 100mm, and more preferably 8mm to 30mm. In the formed wound cell, the third winding initiation section E3 is a two-layer separator, which is preferably bonded together.
In an embodiment of the winding type cell according to the present invention, the first electrode sheet 1 may be a positive electrode sheet or a negative electrode sheet, and the second electrode sheet 2 may be a negative electrode sheet or a positive electrode sheet, respectively. Preferably, the first electrode sheet 1 is a positive electrode sheet, the second electrode sheet 2 is a negative electrode sheet, and correspondingly, the first active material layer 12 is a positive electrode active material layer, and specifically may be at least one of lithium cobaltate, lithium iron phosphate and lithium manganate. The second active material layer 22 is a negative electrode active material layer, and specifically may be at least one of carbon and silicon.
In an embodiment of the coiled electrical core according to the present invention, the first tab 4 is one or more; the second lug 5 is one. Referring to fig. 5, when the number of first tabs 4 of the winding type battery cell is plural, the plurality of first tabs 4 are preferably aligned in the thickness direction T, but the alignment position of each first tab 4 also allows a certain deviation due to a processing error.
In one embodiment of the coiled cell according to the present invention, the first current collector 11 is an aluminum foil and the second current collector 21 is a copper foil.
In an embodiment of the winding type cell according to the present invention, referring to fig. 2 and 3, the main body portion E11 has a blank first current collector 111 that is not coated with the first active material layer 12.
In an embodiment of the winding type battery cell according to the present invention, referring to fig. 4 and 5, a side surface of the body portion E11 facing away from the second winding start section E2 in the thickness direction T is a first surface coated with the first active material layer 12, and a side surface of the second electrode sheet 2 directly opposite to the first surface is coated with the second active material layer 22.
In an embodiment of the winding type cell according to the present invention, referring to fig. 2 to 4, the side of the second current collector 21 directly opposite to the blank first current collector 111 is not coated with the second active material layer 22. Since the first active material layer 12 is not coated on the blank first current collector 111, if the second active material layer 22 is coated on the second current collector 21 directly opposite to the blank first current collector 111, not only is the capacity not helpful (the lithium ions cannot be inserted and extracted back and forth between the blank first current collector 111 and the second current collector 21 directly opposite to the blank first current collector 111), but also the cell thickness is increased to reduce the cell energy density, so that the second active material layer 22 on the side of the second current collector 21 directly opposite to the blank first current collector 111 can be omitted, the waste of materials is avoided, and the cell energy density is improved.
In an embodiment of the winding type cell according to the present invention, referring to fig. 2 to 4, the side of the first current collector 11 directly opposite to the blank second current collector 211 is not coated with the first active material layer 12. Since the second active material layer 22 is not coated on the blank second current collector 211, if the first active material layer 12 is coated on the first current collector 11 directly opposite to the blank second current collector 211, not only is the capacity not helpful (the lithium ions cannot be inserted and extracted back and forth between the blank second current collector 211 and the first current collector 11 directly opposite to the blank second current collector 211), but also the cell thickness is increased to reduce the cell energy density, so that the first active material layer 12 on the side of the first current collector 11 directly opposite to the blank second current collector 211 can be omitted, the waste of materials is avoided, and the cell energy density is improved.
In an embodiment of the winding type battery cell according to the present invention, referring to fig. 2, the main body portion E11 and the folded portion E12 of the first pole piece 1 are both blank first current collectors 111.
In an embodiment of the winding type battery cell according to the present invention, referring to fig. 5, the first electrode sheet 1 further has a first groove 13, the bottom is an exposed blank first current collector 111 and the peripheral side is a first active material layer 12, and the position of the first groove 13 in the length direction L exceeds the end of the second winding initiation section E2.
In an embodiment of the winding type cell according to the present invention, the first tab 4 is integrally formed with the first current collector 11. For example, referring to fig. 6, the first tab 4 is directly cut from the first current collector 11. Further preferably, as shown in fig. 7, the first tab 4 is directly cut and bent from the first current collector 11. When the first tab 4 is plural, the first tab 4 is preferably integrally formed with the first current collector 11.
In an embodiment of the winding type battery cell according to the present invention, the first tab 4 is separately formed and fixed to the corresponding blank first current collector 111 (for example, the first tab 4 is fixed to the blank first current collector 111 at the folded-back portion E12 (refer to fig. 3 to 5), or the first tab 4 is fixed to the blank first current collector 111 at the first groove 13 (refer to fig. 5), or the main body portion E11 of the first tab 1 is the blank first current collector 111 (refer to fig. 2) and the first tab 4 is fixed to the blank first current collector 111 of the main body portion E11).
In an embodiment of the winding type battery cell according to the present invention, referring to fig. 2, the first tab 4 is fixed to the blank first current collector 111 of the main body portion E11, the folded portion E12 does not overlap the second winding start section E2 in the thickness direction T, and preferably the folded portion E12 does not overlap the first tab 4 in the thickness direction T.
In an embodiment of the winding type battery cell according to the present invention, the first tab 4 may be fixed to the corresponding blank first current collector 111 by welding, which is laser welding, ultrasonic welding, or resistance welding. The second tab 5 is preferably a blank second current collector 211 welded to the second winding initiation section E2.
In an embodiment of the wound cell according to the invention, the end of the folded-back portion E12 is glued (not shown) on the side directly opposite to the second pole piece 2 in the thickness direction T; or the side of the second pole piece 2 directly opposite the end of the return E12 is glued with glue (not shown). The gummed paper can prevent burrs at the end of the folded-back portion E12 from piercing the separator 3 to contact the second pole piece 2 and cause a short circuit.
In the winding type battery cell according to the present invention, referring to fig. 8, the winding type battery cell is wound by a first winding pin S1 and a second winding pin S2 sequentially disposed in a length direction L. The third winding initial section E3 of the isolation film 3 is partially clamped in the clamping groove G between the first winding needle S1 and the second winding needle S2, when the first winding needle S1 and the second winding needle S2 rotate, the isolation film 3 and the first pole piece 1 and the second pole piece 2 separated by the isolation film 3 are wound on the first winding needle S1 and the second winding needle S2, after winding is completed, the first winding needle S1 and the second winding needle S2 are pulled out, and then the winding type battery cell is formed.
Claims (13)
1. A coiled electrical cell, comprising:
a first electrode sheet having a first current collector and a first active material layer coated on at least one surface of the first current collector;
a second pole piece having a second current collector and a second active material layer coated on at least one surface of the second current collector, a second winding start section of the second pole piece having a blank second current collector without the second active material layer coated thereon;
the isolating film is arranged between the first pole piece and the second pole piece to isolate the first pole piece from the second pole piece;
the first tab is electrically connected with the first current collector;
the second lug is fixed on the blank second current collector;
it is characterized in that the method comprises the steps of,
the first winding initiation section of the first pole piece includes:
the main body part is positioned at the outer side of the second winding initial section along the thickness direction, and the length of the main body part along the length direction is longer than that of the second winding initial section along the length direction; and
a reverse folded part connected with the main body part and positioned at the inner side of the main body part along the thickness direction, and the reverse folded part is not overlapped with the second lug in the thickness direction; the reverse folded part is provided with a blank first current collector which is not coated with a first active material layer;
in the length direction, the position of the first tab exceeds the end part of the second winding starting section; at least a part of the third winding start section of the separator is folded back to the inner side in the thickness direction, and the third winding start section folded back to the inner side in the thickness direction is located between the first tab and the second tab in the length direction.
2. The winding type cell according to claim 1, wherein a layer of the separator is provided on the inner side and the outer side adjacent to the second winding start section of the second pole piece in the thickness direction, respectively, and the two layers of the separator each exceed the end of the second winding start section, and the two layers of the separator exceeding the end of the second winding start section together constitute a third winding start section of the separator.
3. The coiled electrical cell of claim 1, wherein the first pole piece is a positive pole piece and the second pole piece is a negative pole piece.
4. The coiled electrical cell of claim 1, wherein the electrical cell comprises,
one or more first tabs are provided;
the second lug is one.
5. The coiled cell of claim 1, wherein the body portion has a blank first current collector that is not coated with the first active material layer.
6. The winding cell according to claim 1, wherein a side surface of the body portion facing away from the second winding start section in the thickness direction is a first surface, the first surface is coated with a first active material layer, and a side surface of the second pole piece directly opposite to the first surface is coated with a second active material layer.
7. The coiled cell of claim 1, wherein a side of the second current collector directly opposite the bare first current collector is uncoated with the second active material layer.
8. The wound cell of claim 1 or 5, wherein a side of the first current collector directly opposite the bare second current collector is not coated with the first active material layer.
9. The coiled electrical cell of claim 1, wherein the first pole piece further comprises a first recess having a bottom with an exposed blank first current collector and a peripheral side with a first active material layer, and wherein the first recess is located longitudinally beyond an end of the second coiled initiation section.
10. The coiled electrical cell of claim 1, wherein the first tab is integrally formed with the first current collector; or (b)
The first tabs are individually formed and fixed to the corresponding blank first current collectors.
11. The coiled electrical cell of claim 1, wherein the electrical cell comprises,
the adhesive paper is stuck on one side of the end part of the reverse folding part, which is directly opposite to the second pole piece in the thickness direction; or (b)
And the side of the second pole piece, which is directly opposite to the end part of the reverse folding part, is stuck with gummed paper.
12. The coiled electrical cell of claim 5, wherein the electrical cell,
the first tab is fixed to the blank first current collector of the main body portion, and the folded-back portion is not overlapped with the second winding start section in the thickness direction.
13. The coiled electrical cell of claim 12, wherein the electrical cell,
the folded-back portion does not overlap the first tab in the thickness direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610237344.3A CN107302110B (en) | 2016-04-15 | 2016-04-15 | Winding type battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610237344.3A CN107302110B (en) | 2016-04-15 | 2016-04-15 | Winding type battery cell |
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| CN107302110A CN107302110A (en) | 2017-10-27 |
| CN107302110B true CN107302110B (en) | 2023-05-16 |
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| CN201610237344.3A Active CN107302110B (en) | 2016-04-15 | 2016-04-15 | Winding type battery cell |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019093836A1 (en) * | 2017-11-09 | 2019-05-16 | 주식회사 엘지화학 | Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same |
| CN109980230A (en) | 2017-12-28 | 2019-07-05 | 宁德新能源科技有限公司 | Takeup type battery core and electrochemical appliance |
| CN115176372A (en) * | 2021-01-07 | 2022-10-11 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and method and apparatus for manufacturing electrode assembly |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2865023Y (en) * | 2005-12-30 | 2007-01-31 | 比亚迪股份有限公司 | Lithium ion secondary battery |
| CN103682461A (en) * | 2013-12-20 | 2014-03-26 | 东莞新能源科技有限公司 | Method for preparing laminated battery cell |
| CN205564899U (en) * | 2016-04-15 | 2016-09-07 | 宁德新能源科技有限公司 | Coiling type battery cell |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4284341B2 (en) * | 2006-07-25 | 2009-06-24 | 株式会社東芝 | Non-aqueous electrolyte battery, automobile, assist bicycle, motorcycle, rechargeable vacuum cleaner and battery pack |
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2016
- 2016-04-15 CN CN201610237344.3A patent/CN107302110B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2865023Y (en) * | 2005-12-30 | 2007-01-31 | 比亚迪股份有限公司 | Lithium ion secondary battery |
| CN103682461A (en) * | 2013-12-20 | 2014-03-26 | 东莞新能源科技有限公司 | Method for preparing laminated battery cell |
| CN205564899U (en) * | 2016-04-15 | 2016-09-07 | 宁德新能源科技有限公司 | Coiling type battery cell |
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