CN215644569U - Current collector structure for winding type multi-tab battery cell - Google Patents
Current collector structure for winding type multi-tab battery cell Download PDFInfo
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- CN215644569U CN215644569U CN202120788850.8U CN202120788850U CN215644569U CN 215644569 U CN215644569 U CN 215644569U CN 202120788850 U CN202120788850 U CN 202120788850U CN 215644569 U CN215644569 U CN 215644569U
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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
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Abstract
The utility model discloses a current collector structure for a winding type multi-lug battery cell, which belongs to the technical field of lithium ion batteries and comprises a positive current collector, a negative current collector and a battery cell, wherein a pole piece is arranged on the battery cell, the pole piece is cut to form a plurality of lugs, the positive current collector and the negative current collector are identical in structure, a steel shell is sleeved on the surface of the battery cell, a cap is arranged on the steel shell, the plurality of lugs are positioned on two sides of the battery cell, the plurality of lugs comprise a positive lug and a negative lug, the negative current collector is positioned between the lug end of the negative pole and the bottom of the steel shell, the positive current collector is positioned between the lug end of the positive pole and the cap, the positive current collector is welded on the cap, and the negative current collector is welded on the bottom of the steel shell. The utility model can realize the winding type multi-lug battery cell without aligning a plurality of lugs by adding the anode current collector and the cathode current collector with special structures in the battery cell, solves the defects of the prior multi-lug battery cell technology, and reduces the process difficulty and the equipment requirement of the manufacture of the multi-lug battery cell.
Description
Technical Field
The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a current collector structure for a winding type multi-tab battery cell.
Background
The lithium ion battery has the advantages of high energy density, good cyclicity and the like, and is widely applied to the fields of portable electronic equipment, power automobiles, energy storage and the like. The cylindrical battery generally comprises a steel shell, a top cover, a positive plate, a negative plate, a diaphragm, electrolyte and the like, wherein the positive electrode tab is upwards led out and welded with the tab at the position of the cover cap, and the negative electrode tab is connected with the steel shell through bottom welding.
At present, empty foil areas are reserved at the edges of positive and negative current collectors during coating of a multi-lug cylindrical battery core, and after rolling and cutting, the empty foil areas at the edges of pole pieces are cut before winding to form a plurality of lugs. However, the current multi-tab cell technology has obvious defects, which are mainly reflected in the following aspects:
after the multi-tab battery cell is wound, a plurality of tabs can be welded together after being aligned, and after the number of the tabs is increased, the difficulty of aligning the tabs is increased, so that higher requirements on processes and equipment are provided;
secondly, a plurality of tabs are welded together and then are led out to be welded with the tabs at the cover cap, and due to the increase of the number of the tabs, the plurality of tabs are welded together, the flexibility of the whole tab is poor relative to that of a single tab, and the requirements on welding equipment and a welding process are higher;
thirdly, current many utmost point ear structure aligns after coiling owing to need a plurality of utmost point ears, and the radial position that the utmost point ear distributes is the same promptly, and this thickness that can make utmost point ear department electric core increases, aggravates the phenomenon of capacity loss and lithium of separating around the utmost point ear, causes the potential safety hazard.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: the current collector structure for the winding type multi-lug battery cell is provided for solving the problem that the process difficulty is high and potential safety hazards are easily caused due to the fact that the winding type multi-lug battery cell is realized on the premise that a plurality of lugs of the existing multi-lug cylindrical battery cell need to be aligned.
In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a mass flow body structure for coiling formula multiple-tab electric core, includes anodal mass flow body, negative current collector and electric core, be provided with on the electric core the pole piece, the pole piece cuts and forms multiple-tab, anodal mass flow body with negative current collector structure is the same, electric core surface cover is equipped with the box hat, be provided with the block on the box hat, multiple-tab is located the both sides of electric core, multiple-tab includes anodal utmost point ear and negative pole utmost point ear, the negative current collector is located negative pole ear end with between the box hat bottom, anodal mass flow body is located between anodal ear end and the block hat, anodal mass flow body welding is in on the block, negative current collector welding is in on the box hat bottom.
As a further description of the above technical solution:
the positive electrode current collector and the negative electrode current collector include, but are not limited to, any one of a coiled type, a grid type, a linear type, an annular type, and a sheet type.
As a further description of the above technical solution:
the positive current collector and the negative current collector are formed of a wire, a metal band, or a metal sheet.
As a further description of the above technical solution:
the positive current collector is made of aluminum, and the negative current collector is made of copper or a copper-nickel composite material.
As a further description of the above technical solution:
the positive pole mass flow body with positive pole utmost point ear or negative pole mass flow body with when the welding of negative pole utmost point ear, optional resistance welds, ultrasonic welding, arbitrary suitable welding mode in the laser welding.
As a further description of the above technical solution:
the positive current collector with during the block welding or the negative current collector with during the welding of steel-clad bottom, optional resistance welding, ultrasonic welding, arbitrary suitable welding mode in the laser welding.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
in the utility model, the material of the positive current collector welded by the positive electrode lug is aluminum, and the material of the negative current collector welded by the negative electrode lug is copper or copper-nickel composite. The shapes of the positive current collector and the negative current collector comprise, but are not limited to, a coiled structure, a grid structure, a linear structure, an annular structure, a sheet structure and the like, the positive pole piece and the negative pole piece are cut to form a multi-tab position without ensuring that the pole pieces are in an aligned state after being coiled, the multi-tabs distributed dispersedly after being coiled can penetrate through the positive current collector or the negative current collector, the multi-tabs are welded on the positive current collector and the negative current collector in a suitable mode of resistance welding or laser welding and the like, finally, the negative current collector welded with the negative electrode tabs is welded at the bottom of a steel shell, the positive current collector welded with the positive electrode tabs is welded with a cap tab, and the multi-tab dispersedly distributed mode is relative to a radial position aligned in a concentrated mode, so that the increase of the thickness of a battery cell at the tab can be effectively reduced, and the condition of lithium precipitation or capacity loss around the tab can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a pole piece used in a wound multi-tab cell.
Fig. 2 is a schematic structural diagram of a current collector structure for a wound multi-tab cell.
Fig. 3 is a schematic structural diagram of a negative electrode tab welded on a negative electrode current collector in a current collector structure for a winding multi-tab cell.
Fig. 4 is a schematic structural diagram of a positive tab welded on a positive current collector in a current collector structure for a winding multi-tab cell.
Fig. 5 is a schematic structural diagram of a positive electrode current collector in the first embodiment.
Fig. 6 is a schematic structural diagram of a positive electrode current collector in the second embodiment.
Fig. 7 is a schematic structural view of a positive electrode current collector in the third embodiment.
Illustration of the drawings:
1-positive current collector; 2-negative current collector; 3-electric core; 4-multiple tabs; 41-positive pole tab; 42-negative pole tab; 5-steel shell; 6-pole piece.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: the utility model provides a mass flow body structure for coiling formula many utmost point ear electricity core, includes anodal mass flow body 1, negative current collection body 2 and electric core 3, be provided with on the electric core 3 pole piece 6, pole piece 6 cuts and forms many utmost point ear 4, anodal mass flow body 1 with negative current collection body 2 structure is the same, 3 surface covers of electric core are equipped with steel casing 5, be provided with the block on the steel casing 5, many utmost point ear 4 are located the both sides of electric core 3, many utmost point ear 4 includes anodal utmost point ear 41 and negative pole utmost point ear 42, negative current collection body 2 is located negative pole utmost point ear 42 end with between the steel casing 5 bottoms, anodal mass flow body 1 is located between anodal utmost point ear 41 end and the block, anodal mass flow body 1 welding is in on the block, negative current collection body 2 welding is in on the steel casing 5 bottoms.
The positive electrode current collector 1 and the negative electrode current collector 2 include, but are not limited to, any one of a coiled, mesh, grid, linear, annular, and sheet structure.
The positive current collector 1 and the negative current collector 2 are formed of a wire, a metal tape, or a metal sheet.
The positive current collector 1 is made of aluminum, and the negative current collector 2 is made of copper or a copper-nickel composite material.
When the positive electrode current collector 1 and the positive electrode tab 41 or the negative electrode current collector 2 and the negative electrode tab 42 are welded, any suitable welding mode of resistance welding, ultrasonic welding and laser welding can be selected.
The positive current collector 1 and when the block welds or the negative current collector 2 with when the bottom of the steel shell 5 welds, can select any suitable welding mode in resistance welding, ultrasonic welding, laser welding.
The positive current collector 1 and the negative current collector 2 are coiled current collectors, and the centers of the positive current collector and the negative current collector are metal sheets (the center of the positive current collector is an aluminum sheet, and the negative current collector is a copper-nickel sheet) for welding with the bottom of a steel shell or a cap electrode lug. And metal wires (the positive electrode is an aluminum wire, and the negative electrode is a copper nickel wire) which are made of the same material as the central metal sheet extend out along the central metal sheet in a coiling way. This structure need not a plurality of utmost point ears and aligns, has improved welding efficiency, has solved the not enough of present many utmost point ears cylinder type electricity core technique.
And an insulating sheet is added between the positive electrode tab 41 and the positive electrode current collector 1 or between the negative electrode tab 42 and the negative electrode current collector 2, so that the battery is prevented from short circuit.
The positive current collector 1 and the negative current collector 2 are annular current collectors, the positive current collector is an aluminum sheet, the negative current collector is a copper-nickel sheet, wherein the annular outer diameter is 80% of the diameter of the battery cell, and the inner diameter is 20% of the diameter of the battery cell. The multi-tab of the multi-tab battery core is distributed on two sides of the pole piece, after the battery core is wound, the extended tabs are located on the outer ring and the inner ring of the winding core, at the moment, when the multi-tab is combined with the annular current collector, the multi-tab of the winding core inner ring can penetrate through the inner ring of the annular current collector, the multi-tab of the winding core outer ring can be distributed on the outer edge of the annular current collector, then the multi-tab exceeds the part of the positive current collector and the negative current collector to be bent, the multi-tab is buckled on the upper part of the current collector, and the multi-tab is welded with the positive current collector and the negative current collector together through a proper welding mode. And finally, welding the negative current collector and the bottom of the battery steel shell, injecting liquid, welding the positive current collector and a cap lug, sealing, and assembling into the cylindrical battery.
The positive current collector 1 and the negative current collector 2 are linear current collectors, wherein the main material of the positive current collector is aluminum, the main material of the negative current collector is copper-nickel composite, and the linear current collectors can be composed of metal wires, metal bands or metal sheets. The linear current collector structure has flexibility and can be adjusted according to the lug positions of the multi-lug battery cell, so that the lug positions of the multi-lug battery cell can be distributed at will. When the coiled multi-lug battery core is combined with the positive and negative current collectors, the part of the lug exceeding the positive and negative current collectors is bent and buckled on the upper parts of the current collectors, and the lug of the battery core and the positive and negative current collectors are welded together by welding modes such as ultrasonic welding or laser welding. One end of the current collector can preweld the lug according to the condition, so that the difficulty in welding the positive and negative current collectors with the cover cap or the bottom of the steel shell can be reduced. And finally, welding a negative current collector with the bottom of the battery steel shell, injecting liquid, welding a positive current collector with a cap lug, sealing, and assembling into the cylindrical battery.
The working principle is as follows: two new structural components (a positive current collector and a negative current collector) are added in the battery core, a plurality of positive and negative electrode lugs are welded on the positive and negative current collectors with special structures respectively, and then the positive and negative current collectors are integrally welded with the bottom of the steel shell/the cap lugs respectively. And bending the part of the multi-pole lug exceeding the positive and negative current collectors, buckling the multi-pole lug on the upper part of the current collectors, welding the pole lug of the battery core and the positive and negative current collectors together in a welding mode such as ultrasonic welding or laser welding, finally welding the negative current collector and the bottom of the steel battery shell, injecting liquid, welding the positive current collector and the pole lug of the cap, sealing and assembling into the cylindrical battery. This kind of welding mode, when the coiling of many utmost point ears electricity core, do not need a plurality of utmost point ears to align, only need to weld a plurality of dispersed utmost point ears on the mass flow body one by one, has so not only avoided many utmost point ears to need align completely after the coiling just can the welded condition to appear, welds the many utmost point ears that distribute dispersedly simultaneously one by one, can reduce the welding degree of difficulty. In addition, the mode that the lugs are distributed dispersedly is relative to the mode that the lugs are aligned in a centralized mode at a radial position, so that the increase of the thickness of the battery cell at the position of the multiple lugs can be effectively reduced, and the condition of lithium precipitation or capacity loss around the lugs is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (6)
1. The utility model provides a mass flow body structure for coiling formula multipolar ear electric core, includes anodal mass flow body (1), negative pole mass flow body (2) and electric core (3), its characterized in that, be provided with pole piece (6) on electric core (3), pole piece (6) cut and form multipolar ear (4), anodal mass flow body (1) with negative pole mass flow body (2) structure is the same, electric core (3) surface cover is equipped with steel casing (5), be provided with the block on steel casing (5), multipolar ear (4) are located the both sides of electric core (3), multipolar ear (4) include anodal utmost point ear (41) and negative pole utmost point ear (42), negative pole mass flow body (2) are located negative pole utmost point ear (42) end with between steel casing (5) bottom, anodal mass flow body (1) are located between anodal utmost point ear (41) end and the block, anodal mass flow body (1) welding is in on the block, and the negative current collector (2) is welded on the bottom of the steel shell (5).
2. The current collector structure for wound multi-tab cells as claimed in claim 1, wherein the positive current collector (1) and the negative current collector (2) comprise any one of, but not limited to, coiled, grid, linear, annular, and sheet structures.
3. A current collector structure for wound multi-tab cells according to claim 2, characterized in that the positive current collector (1) and the negative current collector (2) are formed of wires, metal bands or metal sheets.
4. The current collector structure for a wound multi-tab cell as claimed in claim 1, wherein the positive current collector (1) is made of aluminum, and the negative current collector (2) is made of copper or copper-nickel composite material.
5. The current collector structure for the winding-type multi-tab battery cell according to claim 1, wherein when the positive electrode current collector (1) and the positive electrode tab (41) or the negative electrode current collector (2) and the negative electrode tab (42) are welded, any suitable welding mode selected from resistance welding, ultrasonic welding and laser welding can be selected.
6. The current collector structure for the wound multi-tab battery cell according to claim 1, wherein any suitable welding mode selected from resistance welding, ultrasonic welding and laser welding is selected when the positive current collector (1) is welded with the cap or the negative current collector (2) is welded with the bottom of the steel shell (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120788850.8U CN215644569U (en) | 2021-04-20 | 2021-04-20 | Current collector structure for winding type multi-tab battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120788850.8U CN215644569U (en) | 2021-04-20 | 2021-04-20 | Current collector structure for winding type multi-tab battery cell |
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| CN215644569U true CN215644569U (en) | 2022-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184318A1 (en) * | 2022-03-31 | 2023-10-05 | 宁德新能源科技有限公司 | Battery and electronic apparatus thereof |
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- 2021-04-20 CN CN202120788850.8U patent/CN215644569U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184318A1 (en) * | 2022-03-31 | 2023-10-05 | 宁德新能源科技有限公司 | Battery and electronic apparatus thereof |
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