CN219553838U - Multipolar ear lithium ion battery core and battery - Google Patents
Multipolar ear lithium ion battery core and battery Download PDFInfo
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- CN219553838U CN219553838U CN202223011724.5U CN202223011724U CN219553838U CN 219553838 U CN219553838 U CN 219553838U CN 202223011724 U CN202223011724 U CN 202223011724U CN 219553838 U CN219553838 U CN 219553838U
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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 provides a multi-pole ear lithium ion battery cell and a battery, wherein the multi-pole ear lithium ion battery cell comprises a positive pole piece, a diaphragm and a negative pole piece, a plurality of positive pole lugs are arranged on one side of the positive pole piece at intervals, a plurality of negative pole lugs are arranged on one side of the negative pole piece at intervals, the positive pole piece, the diaphragm and the negative pole piece are sequentially stacked and wound to form the battery cell, the positive pole lugs and the negative pole lugs are staggered after the positive pole piece and the negative pole piece are stacked, the positions of the plurality of positive pole lugs are overlapped after the positive pole piece is wound, the positions of the plurality of negative pole lugs are overlapped after the negative pole piece is wound, the plurality of positive pole lugs with overlapped positions are welded to form a total positive pole lug, and the plurality of negative pole lugs with overlapped positions are welded to form the total negative pole lug. The utility model can provide enough electronic conduction area, increase electronic conduction capacity, prevent the short circuit caused by overlapping of the positive and negative lugs, and has simple cell structure and easy realization.
Description
[ field of technology ]
The utility model relates to the technical field of power batteries, in particular to a multi-lug lithium ion battery cell and a battery.
[ background Art ]
Along with the development of industry, the application scene of the lithium ion battery is wider and wider, the application field is more and more complex, and the requirement on the lithium ion battery is gradually improved from a single capacity index to comprehensive indexes such as capacity, service life, safety, environment adaptation performance, high-rate charging and discharging and the like. The battery structure of single-pole ear, double-pole ear and multi-pole ear is adopted in the market conventionally, the increase of the pole ear is beneficial to reducing the internal resistance and temperature rise of the battery, the rate performance is improved, and the electrochemical performance of the battery is directly influenced by the positions, the sizes, the distances and the like of the pole ears.
In view of the foregoing, it is desirable to provide a new multi-tab lithium ion battery cell and battery to overcome the above-mentioned drawbacks.
[ utility model ]
The utility model aims to provide a multi-pole ear lithium ion battery cell and a battery, which can provide enough electron conduction area, increase electron conduction capacity, prevent short circuit caused by overlapping of positive and negative poles, and have simple battery cell structure and easy realization.
In order to achieve the above object, in a first aspect, the present utility model provides a multi-tab lithium ion battery cell, including a positive tab, a diaphragm, and a negative tab, wherein a plurality of positive tabs are disposed at intervals on one side of the positive tab, a plurality of negative tabs are disposed at intervals on one side of the negative tab, the positive tab, the diaphragm, and the negative tab are sequentially stacked and wound to form the battery cell, the positive tab and the negative tab are stacked, the positive tabs and the negative tabs are staggered, the positions of the plurality of positive tabs overlap after the positive tab is wound, the positions of the plurality of negative tabs overlap after the negative tab is wound, the plurality of positive tabs with overlapping positions are welded to form a total positive tab, and the plurality of negative tabs with overlapping positions are welded to form a total negative tab.
In a preferred embodiment, the height of the positive electrode tab is the same as the height of the negative electrode tab, and the height of the positive electrode tab or the height of the negative electrode tab is 0.4 to 1.3 times the thickness of the battery cell.
In a preferred embodiment, the distance between the total positive tab and the total negative tab is greater than or equal to the distance between the total positive tab or the total negative tab and the edge of the cell.
In a preferred embodiment, the positive plate comprises a positive current collector and a positive active material layer coated on the surface of the positive current collector, wherein the positive current collector is carbon-coated aluminum foil.
In a preferred embodiment, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector, wherein the negative electrode current collector is a carbon-coated copper foil.
In a preferred embodiment, the diaphragm is a PE diaphragm, or a PP and PE mixed composite stretched diaphragm, or a composite diaphragm with a ceramic or PVDF layer coated by a PE or PP diaphragm as a base material, or a composite diaphragm with a ceramic or PVDF layer coated by a PP and PE mixed composite stretched diaphragm as a base material, and the thickness of the diaphragm is 7-30 μm.
In a second aspect, the present utility model provides a battery, including a multi-tab lithium ion cell according to any one of the embodiments of the first aspect.
Compared with the prior art, the multi-lug lithium ion battery cell and the battery provided by the utility model have the advantages that after the positive plate and the negative plate are stacked, the positive lugs and the negative lugs are positioned on the same side of the positive plate or the negative plate and are arranged in a staggered manner, the positions of the positive lugs are overlapped after the positive plate is wound, the positions of the negative lugs are overlapped after the negative plate is wound, the total positive lugs are formed by welding the overlapped positions of the positive lugs, the total negative lugs are formed by welding the overlapped positions of the negative lugs, the positive plate and the negative plate adopt a multi-lug structure, enough electronic conduction area can be provided, the electronic conduction capacity is increased, the positive lugs and the negative lugs are arranged in a staggered manner at intervals, the distance between the positive lugs and the negative lugs can be ensured, the short circuit caused by overlapping of the positive lugs and the negative lugs is prevented, and the battery cell is simple in structure and easy to realize.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded view of a multi-tab lithium ion battery cell provided by the present utility model;
FIG. 2 is an expanded structure diagram of the multi-lug lithium ion battery cell provided by the utility model;
fig. 3 is a winding structure diagram of the multi-tab lithium ion battery cell provided by the utility model.
[ detailed description ] of the utility model
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
Referring to fig. 1, an exploded view of a multi-tab lithium ion battery cell 100 according to the present utility model is shown. The multi-tab lithium ion battery cell 100 includes a positive electrode sheet 10, a separator 20, and a negative electrode sheet 30.
Referring to fig. 2 and 3, a plurality of positive electrode tabs 11 are disposed at intervals on one side of the positive electrode sheet 10, a plurality of negative electrode tabs 31 are disposed at intervals on one side of the negative electrode sheet 30, the positive electrode sheet 10, the diaphragm 20 and the negative electrode sheet 30 are sequentially stacked and wound to form the battery cell 100, the positive electrode tabs 11 and the negative electrode tabs 31 are staggered after the positive electrode sheet 10 and the negative electrode sheet 30 are stacked, the positions of the plurality of positive electrode tabs 11 overlap after the positive electrode sheet 10 is wound, the positions of the plurality of negative electrode tabs 31 overlap after the negative electrode sheet 30 is wound, the plurality of positive electrode tabs 11 with overlapping positions are welded to form a total positive electrode tab 110, and the plurality of negative electrode tabs 31 with overlapping positions are welded to form a total negative electrode tab 310.
According to the multi-electrode-tab lithium ion battery cell 100 provided by the utility model, after the positive electrode tab 10 and the negative electrode tab 30 are stacked, the positive electrode tab 11 and the negative electrode tab 31 are positioned on the same side of the positive electrode tab 10 or the negative electrode tab 30 and are arranged in a staggered manner, a plurality of positive electrode tabs 11 are overlapped after the positive electrode tab 10 is wound, a plurality of negative electrode tabs 31 are overlapped after the negative electrode tab 30 is wound, a total positive electrode tab 110 is formed by welding a plurality of positive electrode tabs 11 overlapped in position, a total negative electrode tab 310 is formed by welding a plurality of negative electrode tabs 31 overlapped in position, the positive electrode tab 10 and the negative electrode tab 30 adopt a multi-electrode-tab structure, enough electronic conduction area can be provided, electronic conduction capacity is increased, the distance between the positive electrode tab 11 and the negative electrode tab 31 can be ensured, short circuit caused by overlapping of the positive electrode tab 11 and the negative electrode tab 31 is prevented, and the battery cell is simple in structure and easy to realize.
In this embodiment, the positive electrode sheet 10, the separator 20, and the negative electrode sheet 30 are sequentially stacked and wound to form the battery cell 100, that is, the battery cell is formed by a winding method. In other embodiments, the battery cell may be formed by lamination, that is, after lamination of the positive electrode sheet 10, the separator 20 and the negative electrode sheet 30, the positions of the positive electrode tabs 11 are overlapped and all welded to the total positive electrode tab to lead out the positive electrode of the battery, and the positions of the negative electrode tabs 31 are overlapped and all welded to the total negative electrode tab to lead out the negative electrode of the battery.
The positive plate 10 comprises a positive current collector 12 and a positive active material layer 13 coated on the surface of the positive current collector 12, wherein the positive current collector 10 is carbon-coated aluminum foil. The negative electrode sheet 30 includes a negative electrode current collector 32 and a negative electrode active material layer 33 coated on the surface of the negative electrode current collector 32, wherein the negative electrode current collector 32 is a carbon-coated copper foil.
Specifically, the carbon-coated foil is adopted to replace a common double-sided light or single-sided light rolled foil as a current collector of the battery, the foil current collector is subjected to surface treatment by utilizing a functional coating (carbon-coated layer), namely, dispersed nano conductive graphite and carbon coated particles are uniformly and finely coated on an aluminum foil/copper foil.
Further, the height of the positive electrode tab 11 is the same as the height of the negative electrode tab 31, and the height of the positive electrode tab or the height of the negative electrode tab is 0.4-1.3 times the thickness of the battery cell. The positive electrode tab 11 and the negative electrode tab 31 are formed by die cutting of the positive electrode sheet 10 and the negative electrode sheet 30, the height of the tab is too short, the subsequent total tab welding is not facilitated, when the height of the tab is too high, the efficiency of the die cutting process is affected, and the height of the tab and the height of the pole piece keep a proper proportion, so that the battery production and assembly are facilitated.
In this embodiment, the distance between the total positive electrode tab 110 and the total negative electrode tab 310 (i.e., L in fig. 3) is greater than or equal to the distance between the total positive electrode tab 110 or the total negative electrode tab 310 and the edge of the battery cell (i.e., L0 in fig. 3), and by limiting the distance between the total positive electrode tab 110 and the total negative electrode tab 310 and the distance between the total positive electrode tab 110 or the total negative electrode tab 310 and the edge of the battery cell, the contact short circuit between the total positive electrode tab 110 and the total negative electrode tab 310 and the contact short circuit between the positive electrode tab 110 and the total negative electrode tab 310 and the housing assembled by the battery cell after the battery cell is assembled can be effectively prevented, so as to improve the safety of the battery cell.
The diaphragm 20 is a PE (polyethylene) diaphragm, or a PP (polypropylene) diaphragm, or a PP and PE mixed composite stretching diaphragm, or a PE or PP diaphragm is used as a base material to be coated with a ceramic or PVDF (polyvinylidene fluoride) layer, or a PP and PE mixed composite stretching diaphragm is used as a base material to be coated with a ceramic or PVDF layer, and the thickness of the diaphragm is 7-30 mu m, so that the diaphragm has strong structural stability and is favorable for electrolyte infiltration.
The utility model also provides a battery, which comprises the multi-lug lithium ion battery cell according to any one of the embodiments. It should be noted that all embodiments of the multi-tab lithium ion battery cell 100 provided by the present utility model are applicable to the battery provided by the present utility model, and can achieve the same or similar technical effects.
In summary, after the positive electrode tab 10 and the negative electrode tab 30 are stacked, the positive electrode tab 11 and the negative electrode tab 31 are positioned on the same side of the positive electrode tab 10 or the negative electrode tab 30 and are staggered, the positions of the positive electrode tab 11 after the positive electrode tab 10 is wound are overlapped, the positions of the negative electrode tab 31 after the negative electrode tab 30 is wound are overlapped, the positions of the overlapped positive electrode tabs 11 are welded to form the total positive electrode tab 110, the overlapped negative electrode tabs 31 are welded to form the total negative electrode tab 310, the positive electrode tab 10 and the negative electrode tab 30 adopt a multi-electrode tab structure, enough electronic conduction area can be provided, the electronic conduction capacity is increased, the positive electrode tab 11 and the negative electrode tab 31 are staggered at intervals, the distance between the positive electrode tab 11 and the negative electrode tab 31 can be ensured, the short circuit caused by the overlapping of the positive electrode tab and the negative electrode tab is prevented, and the battery core is simple in structure and easy to realize.
The foregoing description is only of embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the present utility model.
Claims (6)
1. The lithium ion battery cell with the multipolar lugs is characterized by comprising a positive plate, a diaphragm and a negative plate, wherein a plurality of positive lugs are arranged on one side of the positive plate at intervals, a plurality of negative lugs are arranged on one side of the negative plate at intervals, the positive plate, the diaphragm and the negative plate are sequentially stacked and wound to form the battery cell, the positive plate and the negative plate are stacked, the positive lugs and the negative lugs are staggered, the positions of the positive lugs are overlapped after the positive plate is wound, the positions of the negative lugs are overlapped after the negative plate is wound, the positive lugs are welded to form a total positive lug, and the negative lugs are welded to form a total negative lug; the height of the positive electrode tab is the same as that of the negative electrode tab, and the height of the positive electrode tab or the height of the negative electrode tab is 0.4-1.3 times of the thickness of the battery cell.
2. The multi-tab lithium ion cell of claim 1, wherein a distance between the total positive tab and the total negative tab is greater than or equal to a distance of the total positive tab or the total negative tab from an edge of the cell.
3. The multi-polar lithium ion battery cell of claim 1, wherein the positive plate comprises a positive current collector and a positive active material layer coated on the surface of the positive current collector, and the positive current collector is carbon-coated aluminum foil.
4. The multi-polar lithium ion battery cell of claim 1, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector, and the negative electrode current collector is a carbon-coated copper foil.
5. The multi-pole lithium ion battery cell of claim 1, wherein the membrane is a PE membrane, or a PP and PE mixed composite stretched membrane, or a composite membrane with a ceramic or PVDF layer coated by a PE or PP membrane as a substrate, or a composite membrane with a ceramic or PVDF layer coated by a PP and PE mixed composite stretched membrane as a substrate, and the membrane has a thickness of 7-30 μm.
6. A battery comprising a multi-tab lithium ion cell according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223011724.5U CN219553838U (en) | 2022-11-11 | 2022-11-11 | Multipolar ear lithium ion battery core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223011724.5U CN219553838U (en) | 2022-11-11 | 2022-11-11 | Multipolar ear lithium ion battery core and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219553838U true CN219553838U (en) | 2023-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223011724.5U Active CN219553838U (en) | 2022-11-11 | 2022-11-11 | Multipolar ear lithium ion battery core and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219553838U (en) |
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2022
- 2022-11-11 CN CN202223011724.5U patent/CN219553838U/en active Active
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