CN107302109B - Winding type battery cell - Google Patents
Winding type battery cell Download PDFInfo
- Publication number
- CN107302109B CN107302109B CN201610236059.XA CN201610236059A CN107302109B CN 107302109 B CN107302109 B CN 107302109B CN 201610236059 A CN201610236059 A CN 201610236059A CN 107302109 B CN107302109 B CN 107302109B
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- current collector
- pole piece
- winding
- coiled
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Classifications
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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 electrode sheet having a second current collector and a second active material layer coated on the 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 electrically connected with the second current collector. 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. In the length direction, the third winding start section of the separator is located outside the end of the second winding start section, and extends in a direction away from the end of the second winding start section without being folded back.
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 electrode sheet having a second current collector and a second active material layer coated on at least one surface of the second current collector; 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 electrically connected with the 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 of the second pole piece in the thickness direction, and the length of the main body part in the length direction is larger than that of the second winding initial section in the length direction; and a folded-back portion connected to the main body portion and located inside the main body portion in the thickness direction. In the length direction, the third winding initiation section of the separator is located outside the end of the second winding initiation section of the second pole piece, and extends in a direction away from the end of the second winding initiation section without being folded back.
The beneficial effects of the invention are as follows:
in the winding type battery cell according to the invention, the third winding initial section of the isolating film extends in the direction away from the end of the second winding initial section and is not folded back, so that the long-length rollback is not needed as in the prior art, the using amount of the isolating film is reduced, and the cost is reduced. In addition, the third winding initial section of the isolating film can be prevented from being overlapped with the second winding initial section in the thickness direction by the extending mode, so that 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, the end part of the reverse folding part is only opposite to the second pole piece on one side in the thickness direction, so that the adhesive tape is only required to be stuck on the side, and the other side is opposite to the main body part, so that the adhesive tape is not required to be stuck.
Drawings
FIG. 1 is a schematic diagram of a prior art coiled cell;
fig. 2 is a schematic view of a first embodiment of a coiled electrical cell according to the present invention, wherein a first coiling initiation section, a second coiling initiation section, and a third coiling initiation section are all indicated by dashed boxes;
fig. 3 is a schematic view of a second 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 third 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. 5 is a schematic view of a fourth 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. 6 is a schematic view of a fifth 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. 7 is a schematic view of the formation of a wound cell according to the present invention;
fig. 8 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. 9 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. 10 is a schematic illustration of an embodiment of a coiled cell according to the present invention forming a second tab, wherein the second active material layer is not referred to on the second current collector for clarity;
fig. 11 is a schematic view of another embodiment of a coiled cell according to the present invention forming a second tab, wherein the first active material layer is not referred to on the second current collector for clarity.
Wherein reference numerals are as follows:
1 first pole piece 5 second pole lug
11 first current collector E1 first winding initiation section
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 second pole piece E3 third winding initiation section
21 second current collector S1 first winding needle
211 blank second current collector S2 second winding needle
22 second active material layer G clip groove
23 second groove T thickness direction
3 the length direction of the isolating film L
4 first tab
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 11, 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 electrode sheet 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 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 electrically connected to the second current collector 21.
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 of the second pole piece 2 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; 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. In the longitudinal direction L, the third winding start section E3 of the separator 3 is located outside the end of the second winding start section E2 of the second pole piece 2, and extends in a direction away from the end of the second winding start section E2 without being folded back.
In the winding type cell according to the present invention, since the third winding initiation section E3 of the separator 3 extends in a direction away from the end of the second winding initiation section E2 without being folded back, there is no need for a long-length rollback as in the prior art, thereby reducing the amount of use of the separator 3 and reducing the cost. In addition, the third winding start section E3 of the separator 3 is extended in such a manner that the third winding start section E3 is prevented from overlapping the second winding start section E2 in the thickness direction T, 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, the end of the folded portion E12 is opposite to the second pole piece 2 on only one side in the thickness direction T, so that the adhesive tape is only required to be adhered on the side (since burrs are left at the end of the folded portion E12 in actual production, the isolating film 3 is easy to puncture and contact with the second pole piece 2 to cause a short circuit), and the adhesive tape is not required to be adhered on the other side opposite to the main body portion E11.
In an embodiment of the winding type battery cell according to the present invention, one layer of the separator 3 is provided on the inner side and the outer side adjacent to the second winding initiation section E2 of the second tab 2 in the thickness direction T, respectively, and the two layers of the separator 3 each exceed the end of the second winding initiation section E2, and the two layers of the separator 3 exceeding the end of the second winding initiation section E2 constitute a third winding initiation section E3 of the separator 3. In the formed wound cell, the third winding initiation section E3 is a two-layer separator, which is preferably bonded together.
In one embodiment of the winding type cell according to the present invention, the length of the third winding initiation section E3 of the separator 3 is related to the length of the winding type cell, and the minimum length is 3mm or less, preferably 3mm to 100mm, and most preferably 8mm to 30mm.
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. Referring to fig. 5 and 6, 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 second tab 5 is one or more. Referring to fig. 6, when the number of the second tabs 5 of the winding type battery cell is plural, the plurality of the second tabs 5 are preferably aligned in the thickness direction T, but the alignment positions of the respective second tabs 5 also allow 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 one embodiment of the wound cell according to the invention, the second winding initiation section E2 of the second pole piece 2 has a blank second current collector 211 which is not coated with the second active material layer 22.
In one embodiment of the rolled cell according to the invention, the side of the first current collector 11 directly opposite 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 one embodiment of the coiled cell according to the present invention, the return E12 has a blank first current collector 111 that is not coated with the first active material layer 12.
In one embodiment of the coiled cell according to the present invention, the 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 cell according to the invention, 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 battery cell according to the present invention, the first pole piece 1 further has a first groove 13, the bottom is an exposed blank first current collector 111 and the periphery is a first active material layer 12, and the first tab 4 is disposed in the first groove 13 and electrically connected to the blank first current collector 111; the second electrode sheet 2 further has a second groove 23, the bottom is an exposed blank second current collector 211 and the peripheral side is a second active material layer 22, and the second electrode tab 5 is disposed in the second groove 23 and electrically connected to the blank second current collector 211.
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. 8, the first tab 4 is directly cut from the first current collector 11. Further preferably, as shown in fig. 9, 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 coiled cell according to the invention, the second tab 5 is formed integrally with the second current collector 21. For example, referring to fig. 10, the second tab 5 is directly cut from the second current collector 21. Further preferably, as shown in fig. 11, the second tab 5 is directly cut and bent from the second current collector 21. When the second tab 5 is plural, the second tab 5 is preferably integrally formed with the second current collector 21.
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, referring to fig. 3 to 6, the first tab 4 is fixed to the blank first current collector 111 at the folded-back portion E12; alternatively, referring to fig. 5 and 6, the first tab 4 is fixed to the blank first current collector 111 at the first groove 13; alternatively, referring to fig. 2, the first tab 4 is fixed to the blank first current collector 111 of the main body E11.
In an embodiment of the winding type battery cell according to the present invention, referring to fig. 2, the first tab 4 is formed separately and fixed to the blank first current collector 111 of the main body portion E11, and preferably the folded-back portion E12 does not overlap with the first tab 4 in the thickness direction T.
In one embodiment of the coiled cell according to the present invention, the second tab 5 is formed separately and fixed to the blank second current collector 211; correspondingly, the folded-back portion E12 does not overlap the second tab 5 in the thickness direction T. For example, referring to fig. 2 to 6, the second tab 5 is fixed to the blank second current collector 211; alternatively, referring to fig. 6, the second tab 5 is fixed to the blank first current collector 111 at the second groove 23.
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 may be fixed to the corresponding blank second current collector 211 by welding, which is laser welding, ultrasonic welding, or resistance welding.
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. 7, 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 (16)
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 electrode sheet having a second current collector and a second active material layer coated on at least one surface of the second current collector;
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 electrically connected with the 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 of the second pole piece in the thickness direction, and the length of the main body part in the length direction is larger than that of the second winding initial section in the length direction; and
a reverse folding part connected with the main body part and positioned at the inner side of the main body part along the thickness direction;
in the length direction, the third winding initial section of the isolating film is positioned outside the end part of the second winding initial section of the second pole piece, extends along the direction away from the end part of the second winding initial section and is not folded back;
the first pole piece is also provided with a first groove, the bottom of the first pole piece is an exposed blank first current collector, the periphery of the first pole piece is provided with a first active material layer, and the first pole lug is arranged in the first groove and is electrically connected with the blank first current collector;
the second pole piece is also provided with a second groove, the bottom of the second pole piece is an exposed blank second current collector, the periphery of the second pole piece is provided with a second active material layer, and the second lug is arranged in the second groove and is electrically connected with the blank second current collector.
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 separator on both sides exceeds the end of the second winding start section, and the separator on both sides exceeding the end of the second winding start section constitutes a third winding start section of the separator.
3. The coiled cell of claim 1, wherein the third coiled initiation section of the separator has a length of 3mm to 100mm.
4. A coiled cell according to claim 3, wherein the third winding initiation section of the separator has a length of 8mm to 30mm.
5. 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.
6. The coiled electrical cell of claim 1, wherein the electrical cell comprises,
one or more first tabs are provided;
the second lug is one or more.
7. The coiled cell of claim 1, wherein the second winding initiation section of the second pole piece has a blank second current collector that is not coated with the second active material layer.
8. The coiled electrical cell of claim 7, wherein a side of the first current collector directly opposite the bare second current collector is uncoated with the first active material layer.
9. The coiled cell of claim 1, wherein the return has a blank first current collector that is not coated with the first active material layer.
10. 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.
11. The wound cell of claim 9 or 10, wherein a side of the second current collector directly opposite the bare first current collector is uncoated with the second active material layer.
12. The coiled electrical cell of claim 1, wherein the electrical cell comprises,
the first tab is integrally formed with the first current collector;
the second tab is integrally formed with the second current collector.
13. The coiled cell of claim 9 or 10, wherein the first tabs are formed separately and secured to corresponding blank first current collectors.
14. The coiled electrical cell of claim 10, wherein the electrical cell,
the first tab is formed separately and fixed to the blank first current collector of the main body portion,
the folded-back portion does not overlap the first tab in the thickness direction.
15. The coiled electrical cell of claim 7, wherein the electrical cell,
the second lug is independently formed and fixed on the blank second current collector;
the folded-back portion does not overlap the second lug in the thickness direction.
16. The coiled electrical cell of claim 9, wherein the electrical cell,
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610236059.XA CN107302109B (en) | 2016-04-15 | 2016-04-15 | Winding type battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610236059.XA CN107302109B (en) | 2016-04-15 | 2016-04-15 | Winding type battery cell |
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| Publication Number | Publication Date |
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| CN107302109A CN107302109A (en) | 2017-10-27 |
| CN107302109B true CN107302109B (en) | 2023-08-29 |
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| CN201610236059.XA Active CN107302109B (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 |
|---|---|---|---|---|
| EP4106048A4 (en) * | 2021-04-28 | 2023-06-14 | Ningde Amperex Technology Ltd. | Cell and power utilization apparatus |
| CN113193163B (en) * | 2021-04-28 | 2022-08-12 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| CN114447342B (en) * | 2022-04-08 | 2022-07-26 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| JP2003086233A (en) * | 2001-09-07 | 2003-03-20 | Mitsubishi Electric Corp | Flat plate type battery |
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| CN203218374U (en) * | 2013-03-28 | 2013-09-25 | 东莞新能源科技有限公司 | Lithium ion battery with winding structure |
| CN105324877A (en) * | 2013-10-31 | 2016-02-10 | 株式会社Lg化学 | Secondary battery having jelly roll-type electrode assembly having intermittent blank portion formed on positive electrode collector |
| CN205564900U (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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4968182B2 (en) * | 2008-05-29 | 2012-07-04 | ソニー株式会社 | Winding electrode body and non-aqueous electrolyte secondary battery |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09213374A (en) * | 1996-02-01 | 1997-08-15 | Nippon Mori Energ Kk | Rectangular battery |
| JP2003086233A (en) * | 2001-09-07 | 2003-03-20 | Mitsubishi Electric Corp | Flat plate type battery |
| CN101212040A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Battery pole plate, method for producing the pole plate, and Li-ion battery |
| CN203218374U (en) * | 2013-03-28 | 2013-09-25 | 东莞新能源科技有限公司 | Lithium ion battery with winding structure |
| CN105324877A (en) * | 2013-10-31 | 2016-02-10 | 株式会社Lg化学 | Secondary battery having jelly roll-type electrode assembly having intermittent blank portion formed on positive electrode collector |
| CN205564900U (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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| CN107302109A (en) | 2017-10-27 |
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