CN114171774B - Battery cell processing method and tab pre-bending device - Google Patents
Battery cell processing method and tab pre-bending device Download PDFInfo
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- CN114171774B CN114171774B CN202111448752.0A CN202111448752A CN114171774B CN 114171774 B CN114171774 B CN 114171774B CN 202111448752 A CN202111448752 A CN 202111448752A CN 114171774 B CN114171774 B CN 114171774B
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- bending
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- 238000005452 bending Methods 0.000 title claims abstract description 58
- 238000003693 cell processing method Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 41
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000003672 processing method Methods 0.000 claims abstract 2
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical group [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to the technical field of lithium battery processing, in particular to a battery cell processing method and a tab pre-bending device. The battery cell processing method comprises the following steps: s1: die cutting is carried out on the pole piece, S2: pre-bending the pole lug towards the axis direction of the pole piece winding in the winding and conveying process of the pole piece after die cutting, and S3: and winding the pre-bent pole piece through a winding needle. The battery core processing method is used for pre-bending the pole piece in the winding and conveying process, so that the flow is simplified, and the flattening effect of the pole lug is improved. This utmost point ear pre-bending device includes first roller, the roller is crossed to the second and the subassembly is buckled, the roller setting is crossed in the first below of crossing the roller to the second, the pole piece is located first roller and the second of crossing between the roller, first roller and the second of crossing can press from both sides jointly and establish the pole piece of treating the coiling of carrying, the subassembly of buckling sets up on first roller, the subassembly of buckling can buckle towards the axis direction that the pole piece was convoluteed with the utmost point ear of pole piece one end of treating the coiling, the improvement is to the effect of flattening of utmost point ear.
Description
Technical Field
The invention relates to the technical field of lithium battery processing, in particular to a battery cell processing method and a tab pre-bending device.
Background
The large cylindrical battery cell is rapidly developed in the lithium ion battery due to high energy density and strong overcurrent capacity. In the processing process of the large cylindrical battery core, the positive pole piece and the negative pole piece after die cutting are required to be wound firstly to form the wound battery core, then two end faces of the battery core (namely a tab of the positive pole piece and a tab of the negative pole piece) are rubbed flat, and then the current collecting disc is welded with the end face of the battery core to conduct current and finally assemble the battery.
In the prior art, the pole lug on the pole piece is prone to outward warping and turning over during the winding process, the pole lug is outward turned over and warped, so that the production efficiency is reduced, the qualified rate of the winding process is influenced, and the subsequent production of the battery cell has great safety risk. In addition, the battery cell after winding needs to be flatly rubbed at the end face of the battery cell for 360-degree rotation in the subsequent battery cell flatting process, so that the tabs on the end face of the battery cell are bent one by one from outside to inside, the process is complex, the flatly rubbing difficulty is increased, the kneading plane is not flat enough, and the flatly rubbing quality is reduced.
Therefore, it is desirable to provide a cell processing method and a tab pre-bending apparatus to solve the above problems.
Disclosure of Invention
The invention aims to provide a battery cell processing method which can pre-bend a pole lug in the pole piece winding and conveying process, simplify the process and improve the flattening quality of the pole lug.
Another object of the present invention is to provide a tab pre-bending apparatus, so as to avoid the phenomenon that the tab turns outward and tilts in the winding process of the pole piece, simplify the process, and improve the flattening quality of the end surface of the electrical core.
In order to achieve the purpose, the invention adopts the following technical scheme:
a battery cell processing method comprises the following steps:
s1: die cutting is carried out on the pole piece;
s2: pre-bending the pole lug towards the axis direction of the pole piece winding in the process of winding and conveying the die-cut pole piece;
s3: and winding the pre-bent pole piece through a winding needle.
Preferably, the battery cell processing method further includes:
s4: and flattening the wound tab.
Preferably, in step S1, the uncoated area of the pole piece is die-cut into a multi-tab structure.
Preferably, the pole piece is pre-bent by 30-45 degrees towards the axial direction of the pole piece winding in the winding and conveying process.
Preferably, in step S4, the tab is flattened by feed pressing.
A pole lug pre-bending device is used for pre-bending pole pieces in the battery cell processing method, and comprises the following steps:
a first roller;
the second roller is arranged below the first roller, the pole piece is positioned between the first roller and the second roller, and the first roller and the second roller are configured to jointly clamp and convey the pole piece to be wound; and
the bending assembly is arranged on the first roller and is configured to bend the pole lug at one end of the pole piece to be wound towards the axis direction of the pole piece winding.
Preferably, the bending assembly includes:
the mounting part is sleeved on the first roller, and the first roller can rotate relative to the mounting part; and
and the bending part is sleeved and fixed on the periphery of the mounting part, and the bending part is configured to bend the tab towards the axis direction of the wound pole piece.
Preferably, the tab extends out of the second roller, the bent part is located above the tab, and the bent part is obliquely arranged from the joint of the tab and the pole piece to the free end of the tab towards the direction far away from the first roller.
Preferably, the bent part inclines by 30-45 degrees from the joint of the tab and the pole piece to the free end of the tab towards the direction far away from the first roller.
Preferably, one side of the bent part, which is abutted against the tab, is smoothly arranged.
The invention has the beneficial effects that:
the invention provides a battery cell processing method, which is used for pre-bending a pole lug in the pole piece winding and conveying process, and can prevent the pole lug from being turned outwards and tilted in the pole piece winding process. In addition, when follow-up flattening to the both ends of electric core, only need feed flatten can, need not to buckle in advance the utmost point ear at the both ends of electric core inwards again, just can avoid utmost point ear to take place the phenomenon that turns up, guarantee the uniformity of electric core thickness that flattens, improve the quality of flattening, simplified the processing procedure greatly, also reduced follow-up degree of difficulty that flattens to electric core both ends.
The invention provides a tab pre-bending device which can pre-bend tabs of pole pieces in the battery cell processing method, and through the arrangement of a bending assembly, the bending assembly can bend the tabs at one end of the pole pieces to be wound towards the axis direction of the winding of the pole pieces, so that the tabs on the pole pieces are pre-bent before being wound, the phenomenon that the pole pieces warp and turn over outwards in the winding process can be avoided, and the qualified rate of battery cell production is improved. In addition, through buckling in advance to the utmost point ear at the coiling transportation in-process, when follow-up when flattening the both ends of electric core, only need feed flatten can, need not to buckle in advance the utmost point ear at the both ends of electric core again, just can avoid utmost point ear to take place the phenomenon of turning up, guarantee the uniformity that the thickness was flattened to electric core, improve the quality of flattening, simplified the manufacturing procedure greatly, also reduced follow-up degree of difficulty that flattens to electric core both ends.
Drawings
Fig. 1 is a flowchart of a cell processing method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a tab pre-bending device provided by an embodiment of the invention;
FIG. 3 is a cross-sectional view of a bending assembly provided by an embodiment of the present invention.
In the figure:
100. a tab pre-bending device; 200. pole pieces; 201. a tab;
1. a first roller; 2. a second roller; 3. a bending assembly; 31. an installation part; 32. a bending part.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.
As shown in fig. 1, this embodiment provides a method for processing a battery cell, including the following steps:
s1: die cutting is carried out on the pole piece 200;
s2: pre-bending the tab 201 towards the axial direction of the winding of the pole piece 200 in the process of winding and conveying the die-cut pole piece 200;
s3: and winding the pre-bent pole piece 200 through a winding needle.
According to the battery cell processing method, the pole piece 200 is pre-bent in the winding and conveying process, so that the pole lug 201 is prevented from being turned outwards and tilted in the winding process of the pole piece 200. In addition, when follow-up utmost point ear 201 to electric core both ends flatten at ordinary times, only need feed flatten can, need not to buckle in advance the utmost point ear 201 at the both ends of electric core again inwards, just can avoid utmost point ear 201 to take place the phenomenon of turning up, guarantee the uniformity of electric core thickness that flattens, improve the quality of flattening, simplified the process flow greatly, also reduced follow-up degree of difficulty to electric core both ends flatten.
In step S1, the uncoated area of the pole piece 200 is die-cut into a multi-tab structure.
Continuing as shown in fig. 1, the cell processing method further includes:
s4: and flattening the wound tab 201.
It should be noted that, in step S4, in this embodiment, the tab 201 is flattened by feeding and extruding, and since the pole piece 200 in the battery cell is pre-bent before winding, only the tab needs to be fed and flattened in the flattening process, compared with the transmission flattening process, the tab 201 and the flattening device do not rotate with each other, so that friction in the flattening process of the tab 201 is reduced, generation of metal chips in the flattening process of the tab 201 is avoided, dangerous phenomena such as short circuit of the subsequent battery cell due to the generation of metal chips are avoided, and safety performance of the battery is improved.
Preferably, in step S2, the pole piece 200 pre-bends the tab 201 toward the axial direction of the pole piece 200 winding in the winding and conveying process by 30 ° to 45 °, so as to improve the inward bending effect of the tab 201, and ensure the consistency of the winding and flattening thickness of the tab 201 inward in the subsequent process of feeding and flattening the tab 201 on the end surface of the electric core.
As shown in fig. 2, this embodiment further provides a tab pre-bending apparatus 100, which is mainly used for bending a tab 201 at one end of a pole piece 200 to be wound in the above-mentioned battery cell processing method toward an axis direction of winding the pole piece 200, so that the tab 201 on the pole piece 200 is pre-bent in a winding and conveying process, which can avoid the tab 201 on the pole piece 200 from warping and turning outwards in the winding process, and improve the yield of battery cell production. In addition, through buckling in advance to utmost point ear 201 in the coiling transportation process, when follow-up when flattening the both ends of electric core, only need feed flatten can, need not to buckle in advance the utmost point ear 201 at the both ends of electric core inwards again, just can avoid utmost point ear 201 to take place the phenomenon of turning up, guarantee the uniformity that electric core thickness flattened, improve the quality of flattening, simplified the processing procedure greatly, also reduced follow-up degree of difficulty to electric core both ends flattening.
Specifically, as shown in fig. 2, the tab pre-bending apparatus 100 includes a first roller 1, a second roller 2, and a bending assembly 3, wherein the second roller 2 is disposed below the first roller 1, the second roller 2 and the first roller 1 are disposed side by side, the pole piece 200 is located between the first roller 1 and the second roller 2, and the first roller 1 and the second roller 2 rotate in opposite directions to jointly clamp and convey the pole piece 200 to be wound. Bending assembly 3 sets up on first roller 1 of crossing, crosses roller 2 when first roller 1 of crossing and the second and is carrying pole piece 200's in-process, and bending assembly 3 can buckle the axle line direction that pole lug 201 of pole piece 200 one end that waits to convolute convoluteed towards pole piece 200 to the realization is to pole lug 201's pre-bending process.
The specific structure of the bending assembly 3 is described with reference to fig. 3, as shown in fig. 3, the bending assembly 3 includes an installation portion 31 and a bending portion 32, wherein the installation portion 31 is sleeved on the first roller 1, and the first roller 1 can rotate relative to the installation portion 31, the bending portion 32 is fixedly sleeved on the periphery of the installation portion 31, and the bending portion 32 can bend the tab 201 toward the axis direction of the pole piece 200, and this arrangement makes the bending assembly 3 simple in structure and convenient to operate. The bending portion 32 and the mounting portion 31 are integrally formed, so that the structural strength of the entire bending assembly 3 can be ensured, and the production and processing are facilitated.
In this example, as shown in fig. 2 and fig. 3, tab 201 stretches out second roller 2, kink 32 is located above tab 201, and kink 32 is set up towards the direction slope of keeping away from first roller 1 by the junction of tab 201 and pole piece 200 to the free end of tab 201, when pole piece 200 passes between first roller 1 and second roller 2, tab 201 on pole piece 200 is under the effect of kink 32 slope extrusion, tab 201 can be automatically bent towards the direction of second roller 2, thereby guarantee that tab 201 at the terminal surface department of the electric core of winding molding all draws close towards the axis direction.
Preferably, the bending portion 32 inclines by 30 ° to 45 ° from the joint of the tab 201 and the pole piece 200 to the free end of the tab 201 toward the direction away from the first roller 1, so as to improve the inward bending effect of the bending portion 32 on the tab 201, and ensure the consistency of the winding and flattening thickness of the tab 201 inward in the subsequent process of feeding and flattening the tab 201 on the end surface of the electrical core.
Further, one side that kink 32 and utmost point ear 201 butt set up smoothly to reduce pole piece 200 in the transmission between utmost point ear 201 and the kink 32 frictional force, avoid utmost point ear 201 to produce the metal fillings at the in-process of buckling, thereby influence the security performance of battery.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A battery core processing method is characterized by comprising the following steps:
s1: die cutting is carried out on the pole piece (200);
s2: pre-bending a tab (201) towards the axis direction of the pole piece (200) winding in the process of winding and conveying the die-cut pole piece (200);
s3: winding the pre-bent pole piece (200) through a winding needle;
in the step S2, the pole piece (200) pre-bends the pole lug (201) towards the axial direction of the pole piece (200) winding in the winding and conveying process by 30-45 degrees.
2. The cell machining method of claim 1, further comprising:
s4: and flattening the wound tab (201).
3. The cell processing method according to claim 1, wherein in step S1, the uncoated area of the pole piece (200) is die-cut into a multi-tab structure.
4. The cell machining method according to claim 2, characterized in that in step S4, the tab (201) is flattened by means of feed pressing.
5. A tab pre-bending apparatus, characterized in that the pole piece (200) in the battery cell processing method according to any one of claims 1 to 4 is pre-bent, and the tab pre-bending apparatus comprises:
a first roller (1);
the second roller (2) is arranged below the first roller (1), the pole piece (200) is positioned between the first roller (1) and the second roller (2), and the first roller (1) and the second roller (2) are configured to jointly clamp and convey the pole piece (200) to be wound; and
the bending assembly (3) is arranged on the first roller (1), and the bending assembly (3) is configured to bend a pole lug (201) at one end of the pole piece (200) to be wound towards the axial direction of winding of the pole piece (200).
6. The tab pre-bending apparatus as claimed in claim 5, wherein the bending assembly (3) comprises:
the mounting part (31) is sleeved on the first roller (1), and the first roller (1) can rotate relative to the mounting part (31); and
and a bending part (32) which is sleeved and fixed on the periphery of the mounting part (31), wherein the bending part (32) is configured to bend the tab (201) towards the axis direction of the winding of the pole piece (200).
7. The tab pre-bending device according to claim 6, characterized in that the tab (201) extends out of the second roller (2), the bent part (32) is located above the tab (201), and the bent part (32) is arranged in a manner of inclining towards a direction away from the first roller (1) from a connection position of the tab (201) and the pole piece (200) to a free end of the tab (201).
8. The tab pre-bending device according to claim 7, wherein the bending part (32) is inclined by 30-45 degrees from the joint of the tab (201) and the pole piece (200) to the free end of the tab (201) in a direction away from the first roller (1).
9. The tab pre-bending device according to claim 6, wherein the side of the bent portion (32) abutting against the tab (201) is smoothly arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448752.0A CN114171774B (en) | 2021-11-30 | 2021-11-30 | Battery cell processing method and tab pre-bending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448752.0A CN114171774B (en) | 2021-11-30 | 2021-11-30 | Battery cell processing method and tab pre-bending device |
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| Publication Number | Publication Date |
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| CN114171774A CN114171774A (en) | 2022-03-11 |
| CN114171774B true CN114171774B (en) | 2023-02-10 |
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| CN114700393B (en) * | 2022-05-09 | 2024-02-13 | 广东利元亨智能装备股份有限公司 | Cylindrical battery flattening method and processing equipment |
| CN115101899B (en) * | 2022-06-13 | 2024-05-28 | 肇庆小鹏汽车有限公司 | Bare cell, manufacturing method of bare cell and cell structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117196A1 (en) * | 2004-05-26 | 2005-12-08 | CHUNG, Hai | Winding type dynamical type lithium-ion. secondary battery |
| WO2015116364A1 (en) * | 2014-01-28 | 2015-08-06 | A123 Systems, LLC | Cylindrical electrochemical cells and method of manufacture |
| CN206585017U (en) * | 2016-12-27 | 2017-10-24 | 宁德新能源科技有限公司 | A kind of takeup type battery core |
| DE202018006912U1 (en) * | 2017-04-14 | 2024-05-16 | Lg Energy Solution, Ltd. | Secondary battery and manufacturing |
| CN206834242U (en) * | 2017-06-07 | 2018-01-02 | 无锡先导智能装备股份有限公司 | Lug creasing mechanism and lithium battery winder |
| CN209697741U (en) * | 2019-02-13 | 2019-11-29 | 江苏塔菲尔新能源科技股份有限公司 | A kind of tab smooths structure and winding apparatus |
| CN110957499B (en) * | 2019-12-30 | 2024-09-24 | 珠海华冠科技股份有限公司 | Tab smoothing guide mechanism, driving roller unit and square power battery core winding machine |
| JP7101873B2 (en) * | 2020-03-03 | 2022-07-15 | 寧徳新能源科技有限公司 | battery |
| CN213401278U (en) * | 2020-10-27 | 2021-06-08 | 上海骄成机电设备有限公司 | Device and winder are prevented rolling over by utmost point ear |
| CN113193165B (en) * | 2021-05-28 | 2023-06-06 | 微宏动力系统（湖州）有限公司 | Tab pole piece and winding battery |
| CN113571845B (en) * | 2021-06-24 | 2022-11-18 | 惠州锂威新能源科技有限公司 | Pole lug folding method for multi-pole-lug battery cell |
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