CN110676431B - Battery cell pole piece structure and welding method - Google Patents
Battery cell pole piece structure and welding method Download PDFInfo
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- CN110676431B CN110676431B CN201910842970.9A CN201910842970A CN110676431B CN 110676431 B CN110676431 B CN 110676431B CN 201910842970 A CN201910842970 A CN 201910842970A CN 110676431 B CN110676431 B CN 110676431B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- H01M10/0431—Cells with wound or folded 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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- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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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
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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
- 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 belongs to the technical field of battery production and manufacture, and particularly relates to a battery core pole piece structure which comprises a first pole piece (1) and a second pole piece (2) with different coating surface densities, wherein the first pole piece (1) and the second pole piece (2) are connected in the length direction to form a pole piece (4), a pole lug (3) is welded in an overlapping area between the first pole piece (1) and the second pole piece (2), and the distance from the pole lug (3) to one end of the pole piece (4) is greater than or equal to the distance from the pole lug (3) to the other end of the pole piece (4). The invention can lead the current density and the temperature rise of the innermost layer and the outermost layer of the battery cell to be consistent, and improve the quality of the battery. In addition, the invention also discloses a welding method of the battery cell pole piece.
Description
Technical Field
The invention belongs to the technical field of battery production and manufacturing, and particularly relates to a battery core pole piece structure and a welding method.
Background
Nowadays, as a novel secondary battery, the lithium ion battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospects in the aspects of portable electrical appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
The existing battery design is formed by winding a cathode sheet and an anode sheet, and for a thicker battery, the designed pole sheet is longer, so that the current density and the temperature rise of each position of the pole sheet are obviously different in the process of high-rate charging or discharging.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the battery core pole piece structure is provided, so that the current density and the temperature rise of the innermost layer and the outermost layer of the battery core tend to be consistent, and the quality of the battery is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a battery core pole piece structure, is including first pole piece and the second pole piece that coating areal density is inequality, first pole piece with the second pole piece is connected in length direction and is formed the pole piece, first pole piece with overlap regional welding between the second pole piece has utmost point ear, utmost point ear arrives the distance of pole piece one end is more than or equal to utmost point ear arrives the distance of the pole piece other end.
As an improvement of the cell pole piece structure of the present invention, a position of the first pole piece corresponding to the overlapping region is an uncoated empty foil, and a position of the second pole piece corresponding to the overlapping region is an uncoated empty foil.
As an improvement of the cell pole piece structure of the present invention, a coating material of the first pole piece is different from a coating material of the second pole piece, and a coating weight of the first pole piece is greater than or equal to a coating weight of the second pole piece.
As an improvement of the structure of the battery cell pole piece, the pole piece comprises an anode piece and a cathode piece, the tabs comprise anode tabs and cathode tabs, the anode tabs are welded on the cathode piece, the cathode tabs are welded on the anode piece, a diaphragm is arranged between the anode piece and the cathode piece, and the anode piece and the cathode piece are folded together to be wound into a battery cell.
As an improvement of the battery cell pole piece structure, an insulating adhesive is adhered to a coating area of the cathode piece corresponding to the cathode tab.
As an improvement of the structure of the battery cell pole piece, when the pole piece is an anode piece, the first pole piece and the second pole piece are respectively coated with one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, a silicon-based composite material and a tin-based composite material, and when the pole piece is a cathode piece, the first pole piece and the second pole piece are respectively coated with one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganese oxide, lithium nickel lithium phosphate, lithium iron phosphate and a lithium-rich manganese base.
As an improvement of the battery cell pole piece structure, the hollow foil is adhered with an insulating adhesive.
As an improvement of the battery cell pole piece structure of the present invention, at least one end of the anode piece in the length direction is an uncoated empty foil, and at least one end of the cathode piece in the length direction is an uncoated empty foil.
The invention also aims to provide a welding method of the battery cell pole piece, which comprises the following steps:
forming a first pole piece and a second pole piece with different coating surface densities by coating, rolling and slitting;
overlapping and welding the empty foil of the first pole piece and the empty foil of the second pole piece together in the length direction to form a pole piece;
and welding a tab in the overlapping area between the first pole piece and the second pole piece.
In the welding method, the empty foil at the tail part of the first pole piece and the empty foil at the head part of the second pole piece are welded together to form the pole piece, so that the length of the pole piece is prolonged, and a thicker battery is generated; the first pole piece is used as the starting end of winding and is arranged on the innermost layer of the battery cell after winding, and the second pole piece is used as the ending end of winding and is arranged on the outermost layer of the battery cell after winding; because the coating surface densities of the first pole piece and the second pole piece are different, and the distances from the pole lugs to the two ends of the pole pieces are equal, the effect that the current density and the temperature rise of the innermost layer and the outermost layer of the battery cell tend to be consistent in the charging and discharging process can be finally achieved by utilizing the difference of the coating surface densities of the first pole piece and the second pole piece.
The invention has the beneficial effects that the invention comprises a first pole piece and a second pole piece which are coated with different surface densities, the first pole piece and the second pole piece are connected in the length direction to form the pole pieces, a pole lug is welded in an overlapping area between the first pole piece and the second pole piece, and the distance from the pole lug to one end of the pole piece is larger than or equal to the distance from the pole lug to the other end of the pole piece. The existing battery design is formed by winding, and for a thicker battery, pole pieces are longer, and in the process of high-rate charging or discharging, the current density and the temperature rise at each position are obviously different, so that the first pole piece and the second pole piece are connected in the length direction to form the pole pieces, the empty foil at the tail part of the first pole piece and the empty foil at the head part of the second pole piece are welded together to form the pole pieces, the length of the pole pieces is prolonged, and the thicker battery is generated; the electrode lugs are welded in the overlapped area between the first pole piece and the second pole piece, so that the impedance of the whole pole piece is reduced, and the electronic transmission distance between two ends of the pole piece is reduced; the first pole piece is used as the starting end of winding and is arranged on the innermost layer of the battery cell after winding, and the second pole piece is used as the ending end of winding and is arranged on the outermost layer of the battery cell after winding; because the coating surface density of first pole piece and second pole piece is inequality, just the utmost point ear arrives the distance of pole piece one end is greater than or equal to the utmost point ear arrives the distance of the pole piece other end can utilize the difference of the coating surface density of first pole piece and second pole piece, finally reaches electric core inlayer and outmost current density and the temperature rise effect that tends to unanimity in the charge-discharge process. The invention can lead the current density and the temperature rise of the innermost layer and the outermost layer of the battery cell to be consistent, and improve the quality of the battery.
Drawings
Fig. 1 is a schematic structural view of a cathode sheet according to example 1 of the present invention.
Fig. 2 is a schematic structural view of an anode sheet according to example 1 of the present invention.
Fig. 3 is a schematic cross-sectional view of a battery cell formed in embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a cathode sheet according to embodiment 2 of the present invention.
Fig. 5 is a schematic cross-sectional view of a battery cell formed in embodiment 2 of the present invention.
Fig. 6 is a graph comparing the full charge time of example 1 and comparative example 1.
Fig. 7 is a graph comparing the charge temperature rise of example 1 and comparative example 1.
Wherein: 1-a first pole piece; 2-a second pole piece; 3, pole ear; 4-pole piece; 31-positive tab; 32-negative tab; 321-insulating glue; 41-anode plate; 42-cathode plate.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 to 3, a cell pole piece structure includes a first pole piece 1 and a second pole piece 2 with different coating surface densities, the first pole piece 1 and the second pole piece 2 are connected in a length direction to form a pole piece 4, a tab 3 is welded in an overlapping area between the first pole piece 1 and the second pole piece 2, and a distance from the tab 3 to one end of the pole piece 4 is greater than or equal to a distance from the tab 3 to the other end of the pole piece 4. The existing battery design is formed by winding, for a thicker battery, pole pieces are longer, and in a high-rate charging or discharging process, the current density and the temperature rise at each position are obviously different, so that the first pole piece 1 and the second pole piece 2 are connected in the length direction to form the pole piece 4, the empty foil at the tail part of the first pole piece 1 and the empty foil at the head part of the second pole piece 2 are welded together to form the pole piece 4, the length of the pole piece 4 is prolonged, and the thicker battery is generated; a tab 3 is welded in an overlapping area between the first pole piece 1 and the second pole piece 2, so that the impedance of the whole pole piece 4 is reduced, and the electron transmission distance at two ends of the pole piece 4 is reduced; the first pole piece 1 is used as the starting end of winding and is positioned at the innermost layer of the battery cell after winding, and the second pole piece 2 is used as the ending end of winding and is positioned at the outermost layer of the battery cell after winding; because the coating surface density of first pole piece 1 and second pole piece 2 is inequality, and the distance that 3 extremely ears to 4 one ends of pole piece is more than or equal to 3 extremely ears to the distance of 4 other ends of pole piece, can utilize the difference of the coating surface density of first pole piece 1 and second pole piece 2, finally reach the effect that electric core inlayer and outmost electric current density and temperature rise tend to unanimity at the charge-discharge in-process.
Preferably, the position of the first pole piece 1 corresponding to the overlapping area is uncoated empty foil, and the position of the second pole piece 2 corresponding to the overlapping area is uncoated empty foil. The overlapping area of the first pole piece 1 and the second pole piece 2 is uncoated empty foil, so that the first pole piece 1 and the second pole piece 2 can be conveniently welded, and the mechanical strength between the first pole piece 1 and the second pole piece 2 is improved.
Preferably, the pole piece 4 comprises an anode sheet 41 and a cathode sheet 42, the tab 3 comprises a positive tab 31 and a negative tab 32, the positive tab 31 is welded to the cathode sheet 42, the negative tab 32 is welded to the anode sheet 41, a diaphragm is arranged between the anode sheet 41 and the cathode sheet 42, and the anode sheet 41 and the cathode sheet 42 are folded together and wound into a cell. Since the cathode tab 42 is an electrode for generating a reduction reaction and the anode tab 41 is an electrode for generating an oxidation reaction, the positive tab 31 is welded to the cathode tab 42 and the negative tab 32 is welded to the anode tab 41.
Preferably, the cathode sheet 42 is adhered with an insulating paste 321 corresponding to the coated region of the negative electrode tab 32. Due to the fact that the lithium separation process is irreversible, the insulating glue 321 is added, metal lithium can be prevented from being separated out near the negative electrode tab 32 or on the surface of the anode sheet 41, damage to the battery is avoided, and safety of the battery is improved.
Preferably, at least one end of the anode sheet 41 in the longitudinal direction is an uncoated empty foil, and at least one end of the cathode sheet 42 in the longitudinal direction is an uncoated empty foil.
Example 2
The difference from example 1 is: in this embodiment, when the pole piece is the anode piece 41, the first pole piece 1 and the second pole piece 2 are respectively coated with one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, silicon-based composite material and tin-based composite material, and when the pole piece is the cathode piece 42, the first pole piece 1 and the second pole piece 2 are respectively coated with one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium nickelate, lithium iron phosphate and lithium-rich manganese base. The current density and the temperature rise of each position of the anode sheet 41 and the cathode sheet 42 can be made to be consistent by changing the materials of the first pole sheet 1 and the second pole sheet 2 respectively.
The other structures are the same as those of embodiment 1, and are not described again here.
Example 3
As shown in fig. 4 to 5, the differences from embodiment 1 are: the cathode sheet 42 of this embodiment is an uncoated empty foil at a position corresponding to the negative electrode tab 32. The empty foil can be pasted with the insulating glue 321 or the insulating glue 321 is not pasted, and the empty foil is reserved during coating, so that the lithium metal can be prevented from being separated out near the negative electrode tab 32 or on the surface of the anode sheet 41, the damage to the battery is avoided, and the safety of the battery is improved.
The other structures are the same as those of embodiment 1, and are not described again here.
Example 4
The difference from example 3 is: the coating material of the first pole piece 1 is different from that of the second pole piece 2, and the coating weight of the first pole piece 1 is larger than or equal to that of the second pole piece 2. The coating material of the first pole piece 1 is different from that of the second pole piece 2, and can be the same, the coating weight of the first pole piece 1 is larger than or equal to that of the second pole piece 2, and the current density and the temperature rise of each position of the pole piece 1 tend to be consistent through the matching of the two coating materials.
The other structures are the same as those of embodiment 3, and are not described again.
Example 5
A welding method of a battery core pole piece comprises the following steps:
forming a first pole piece 1 and a second pole piece 2 with different coating surface densities by coating, rolling and slitting;
overlapping and welding the empty foil of the first pole piece 1 and the empty foil of the second pole piece 2 together in the length direction to form a pole piece 4;
a tab 3 is welded to the overlapping area between the first and second pole pieces 1 and 2.
It should be noted that, in the welding method of the present invention, the empty foil at the tail of the first pole piece 1 and the empty foil at the head of the second pole piece 2 are welded together to form the pole piece 4, which extends the length of the pole piece 4, thereby generating a thicker battery; the first pole piece 1 is used as the starting end of winding and is positioned at the innermost layer of the battery cell after winding, and the second pole piece 2 is used as the ending end of winding and is positioned at the outermost layer of the battery cell after winding; because the coating surface density of the first pole piece 1 and the second pole piece 2 is different, and the distances from the lug 3 to the two ends of the pole piece 4 are equal, the effect that the current density and the temperature rise of the innermost layer and the outermost layer of the battery cell tend to be consistent in the charging and discharging process can be finally achieved by utilizing the difference of the coating surface density of the first pole piece 1 and the second pole piece 2.
Comparative example 1
Different from the embodiment 1, the distances from the polar lugs 3 to the two ends of the pole piece are not equal, and the coating surface density of the pole piece 4 is equal. The rest is the same as embodiment 1, and the description is omitted here.
The batteries obtained in example 1 and comparative example 1 were subjected to performance tests, and the results of the tests are shown in FIGS. 6 to 7.
It can be seen from embodiment 1 and comparative example 1 that, tab 3 is welded in the overlapping area between first pole piece 1 and second pole piece 2, and the coated surface densities of first pole piece 1 and second pole piece 2 are different batteries, and the distances from tab 3 to the two ends of the pole pieces are not equal compared with the distances from tab 3 to the two ends of the pole pieces under the same condition, and the coated surface densities of pole pieces 4 are equal, the time required for fully charging is shorter, and charging is smaller, because the coated surface densities of first pole piece 1 and second pole piece 2 are different, and the distances from tab 3 to the two ends of pole piece 4 are equal, the difference of the coated surface densities of first pole piece 1 and second pole piece 2 can be utilized, and finally the effect that the current density and the temperature rise tend to be consistent in the charge-discharge process of the innermost layer and the outermost layer of the battery cell is achieved.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. The utility model provides a battery core pole piece structure which characterized in that: including first pole piece (1) and second pole piece (2) that coating surface density is different, first pole piece (1) with second pole piece (2) connect in length direction and form pole piece (4), first pole piece (1) with overlap area welding between second pole piece (2) has utmost point ear (3), utmost point ear (3) are arrived the distance of pole piece (4) one end equals utmost point ear (3) are arrived the distance of pole piece (4) the other end, the coating material of first pole piece (1) with the coating material of second pole piece (2) is different, the coating weight of first pole piece (1) is greater than or equal to the coating weight of second pole piece (2), first pole piece (1) corresponds the position in overlap area is the empty foil of uncoated, second pole piece (2) correspond the position in overlap area is the empty foil of uncoated.
2. The cell pole piece structure of claim 1, wherein: the pole piece (4) comprises an anode piece (41) and a cathode piece (42), the tab (3) comprises an anode tab (31) and a cathode tab (32), the anode tab (31) is welded on the cathode piece (42), the cathode tab (32) is welded on the anode piece (41), a diaphragm is arranged between the anode piece (41) and the cathode piece (42), and the anode piece (41) and the cathode piece (42) are folded and coiled into a battery cell.
3. The cell pole piece structure of claim 2, wherein: and the cathode sheet (42) is adhered with an insulating glue (321) corresponding to the coating area of the cathode lug (32).
4. The cell pole piece structure of claim 2, wherein: when the pole piece is anode plate (41), first pole piece (1) with second pole piece (2) coat respectively has one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, silicon-based composite and tin-based composite, works as the pole piece is cathode plate (42), first pole piece (1) with second pole piece (2) coat respectively has one in lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium nickelate, lithium iron phosphate and the rich lithium manganese base.
5. The cell pole piece structure of claim 2, wherein: the position of the cathode sheet (42) corresponding to the negative electrode tab (32) is uncoated empty foil.
6. The cell pole piece structure of claim 5, wherein: the hollow foil is adhered with an insulating glue (321).
7. The cell pole piece structure of claim 2, wherein: at least one end of the anode sheet (41) in the length direction is uncoated empty foil, and at least one end of the cathode sheet (42) in the length direction is uncoated empty foil.
8. A method for welding a cell pole piece, wherein the cell pole piece is in the structure of any one of claims 1 to 7, and comprises:
forming a first pole piece (1) and a second pole piece (2) with different coating surface densities by coating, rolling and slitting;
overlapping and welding the empty foil of the first pole piece (1) and the empty foil of the second pole piece (2) together in the length direction to form a pole piece (4);
and welding a tab (3) in an overlapping area between the first pole piece (1) and the second pole piece (2).
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| CN201910842970.9A CN110676431B (en) | 2019-09-06 | 2019-09-06 | Battery cell pole piece structure and welding method |
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| JP2023525847A (en) * | 2020-05-11 | 2023-06-19 | チューハイ コスミクス バッテリー カンパニー，リミテッド | Batteries and electronic equipment |
| CN111554982B (en) * | 2020-05-11 | 2021-09-07 | 珠海冠宇电池股份有限公司 | Winding battery cell, preparation method thereof, battery and electronic product |
| CN111618588A (en) * | 2020-06-01 | 2020-09-04 | 江西优特汽车技术有限公司 | Method for welding tab of soft-packaged battery cell |
| CN114665059A (en) * | 2020-12-23 | 2022-06-24 | 比亚迪股份有限公司 | Lithium ion battery pole piece, lithium ion battery and vehicle |
| CN117063305A (en) * | 2022-01-14 | 2023-11-14 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, device, and manufacturing apparatus |
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| CN108598598A (en) * | 2018-04-17 | 2018-09-28 | 浙江南都电源动力股份有限公司 | A kind of high-power lithium battery of high specific energy and its manufacturing method |
| CN209056566U (en) * | 2018-11-23 | 2019-07-02 | 惠州锂威新能源科技有限公司 | A kind of electrodes of lithium-ion batteries of high security |
| CN109841794A (en) * | 2019-03-29 | 2019-06-04 | 宁德新能源科技有限公司 | Electrode plates and electrochemical appliance comprising the electrode plates |
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