CN114171774A - 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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- CN114171774A CN114171774A CN202111448752.0A CN202111448752A CN114171774A CN 114171774 A CN114171774 A CN 114171774A CN 202111448752 A CN202111448752 A CN 202111448752A CN 114171774 A CN114171774 A CN 114171774A
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- bending
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- 238000005452 bending Methods 0.000 title claims abstract description 56
- 238000003693 cell processing method Methods 0.000 title claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000003672 processing method Methods 0.000 claims abstract description 3
- 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 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 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
- 230000009471 action Effects 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
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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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 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 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, 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 upwarping and turnover in the winding process, the pole lug is outwards turned and upwarped, the production efficiency is reduced, the qualification rate of the winding process is affected, and the subsequent production of the battery cell has great safety risk. In addition, the battery core after coiling is rubbed flat in-process at follow-up electric core, and the device that need rub flat carries out 360 rotations at the terminal surface of electric core to outside-in bends the utmost point ear on the electric core terminal surface one by one, makes the process complicated, has also increased and has rubbed flat degree of difficulty, also leads to rubbing the plane and levels inadequately easily, thereby has reduced and has rubbed flat quality.
Therefore, it is desirable to provide a cell processing method and a tab pre-bending apparatus to solve the above problems.
Disclosure of Invention
One object of the present invention is to provide a method for processing a battery cell, which can pre-bend a tab during a winding and conveying process of a pole piece, simplify a process, and improve flattening quality of the tab.
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 core 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 areas of the pole pieces are 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 is configured to bend the tab towards the axis direction of the pole piece winding.
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 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 of electric core thickness of flattening, improve the quality of flattening, simplified the processing procedure greatly, also reduced follow-up degree of difficulty to electric core both ends flattening.
The invention provides a tab pre-bending device which can pre-bend tabs of pole pieces in the battery cell processing method, and the bending component is arranged to 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 winding, the phenomenon that the pole pieces are warped and folded 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 expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably 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 specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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 have a special meaning.
As shown in fig. 1, the present 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 pole piece 200 winding 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 flattens at ordinary times, only need to feed flatten can, need not to buckle in advance the utmost point ear 201 at the both ends of electric core again, just can avoid utmost point ear 201 to take place the phenomenon of turning up, guarantee the uniformity of the thickness that flattens of 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.
In step S1, the uncoated areas of the pole piece 200 are 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 the present 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 during flattening, and compared with the transmission flattening process, the tab 201 and the flattening device do not rotate relative to each other, so that friction during flattening of the tab 201 is reduced, generation of metal chips during flattening of the tab 201 is avoided, dangerous phenomena such as short circuit of a subsequent battery cell due to 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, 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 battery cell.
As shown in fig. 2, the embodiment further provides a tab pre-bending device 100, which is mainly used for bending a tab 201 at one end of a pole piece 200 to be wound in the above 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, a phenomenon that the tab 201 on the pole piece 200 is warped and folded outwards in the winding process can be avoided, and a yield of battery cell production is improved. In addition, through buckling in advance to utmost point ear 201 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 201 at the both ends of electric core again, just can avoid utmost point ear 201 to take place the phenomenon of turning up, guarantee the uniformity of the thickness that electric core 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.
Specifically, as shown in fig. 2, the tab pre-bending device 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. The bending assembly 3 is arranged on the first roller 1, and when the first roller 1 and the second roller 2 are used for conveying the pole piece 200, the bending assembly 3 can bend the pole lug 201 at one end of the pole piece 200 to be wound towards the axis direction of the pole piece 200 to be wound, so that the pre-bending process of the pole lug 201 is realized.
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, the tab 201 extends out of the second roller 2, the bent portion 32 is located above the tab 201, and the bent portion 32 is inclined 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, when the pole piece 200 passes between the first roller 1 and the second roller 2, the tab 201 on the pole piece 200 can be automatically bent toward the second roller 2 under the action of the inclined extrusion of the bent portion 32, so as to ensure that the tab 201 at the end surface of the winding-molded battery cell is all drawn close toward the axial 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 of kink 32 and utmost point ear 201 butt sets up smoothly to reduce pole piece 200 and the frictional force between kink 32 at utmost point ear 201 in the transmission course, 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 (10)
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: and winding the pre-bent pole piece (200) through a winding needle.
2. The cell machining method of claim 1, further comprising:
s4: and flattening the wound tab (201).
3. The battery cell processing method of 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 processing method according to claim 1, wherein in step S2, the pole piece (200) is pre-bent by 30 ° to 45 ° in the axial direction of the pole piece (200) winding in the process of winding and conveying.
5. The cell machining method according to claim 2, characterized in that in step S4, the tab (201) is flattened by means of feed pressing.
6. A tab pre-bending device, characterized in that the pole piece (200) in the battery cell processing method according to any of claims 1 to 5 is pre-bent, and the tab pre-bending device 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 tab (201) at one end of the pole piece (200) to be wound towards the axis direction of the winding of the pole piece (200).
7. The tab pre-bending apparatus as claimed in claim 6, 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).
8. The tab pre-bending device according to claim 7, wherein 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 obliquely arranged from the connection position 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 8, wherein the bending part (32) is inclined by 30-45 ° from the connection of the tab (201) and the pole piece (200) to the free end of the tab (201) in a direction away from the first passing roller (1).
10. The tab pre-bending device according to claim 7, 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 |
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| 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 true CN114171774A (en) | 2022-03-11 |
| CN114171774B CN114171774B (en) | 2023-02-10 |
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| CN115101899A (en) * | 2022-06-13 | 2022-09-23 | 肇庆小鹏汽车有限公司 | Naked battery cell, manufacturing method of naked battery cell and battery cell structure |
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| CN114700393A (en) * | 2022-05-09 | 2022-07-05 | 广东利元亨智能装备股份有限公司 | Method and processing equipment for flattening cylindrical battery |
| 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 |
| CN115101899A (en) * | 2022-06-13 | 2022-09-23 | 肇庆小鹏汽车有限公司 | Naked battery cell, manufacturing method of naked battery cell and battery cell structure |
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| CN114171774B (en) | 2023-02-10 |
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