CN216120429U - Battery core pole piece and laminated battery core structure - Google Patents
Battery core pole piece and laminated battery core structure Download PDFInfo
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- CN216120429U CN216120429U CN202122677862.6U CN202122677862U CN216120429U CN 216120429 U CN216120429 U CN 216120429U CN 202122677862 U CN202122677862 U CN 202122677862U CN 216120429 U CN216120429 U CN 216120429U
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- current collector
- slurry
- tab
- pole piece
- cell
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- 239000002002 slurry Substances 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011267 electrode slurry Substances 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 4
- 239000011889 copper foil Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims description 2
- 229910000570 Cupronickel Inorganic materials 0.000 claims 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 238000010030 laminating Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
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- Connection Of Batteries Or Terminals (AREA)
Abstract
本实用新型提供了一种电芯极片，包括集流体和涂覆于集流体上的极性浆料，所述集流体两端偏离中心位置的同一侧分别设置有与极性浆料连接的极耳。本实用新型还提供了一种叠片式电芯结构，包括Z型折叠的隔膜和通过隔膜分隔间隔设置的正极片和负极片，电芯两端的正极耳和负极耳分别在同一位置堆叠形成四个电芯极耳。本实用新型的优点在于：在集流体两端通过极性浆料连接极耳形成双极耳电芯极片，从而增大极片面积，降低极片内阻，提高转化效率。通过对双极耳极片进行叠片形成了电芯结构，由于双极耳极片的内阻较低，形成的电芯内阻自然会降低，提高电芯的能量转化效率，改善电芯发热问题，可以使电池满足大电流放电的需求。
The utility model provides an electric core electrode piece, which comprises a current collector and a polar slurry coated on the current collector, wherein two ends of the current collector are respectively provided with polarized slurry on the same side which is deviated from the center position. Pole ear. The utility model also provides a laminated battery core structure, which includes a Z-folded diaphragm, a positive electrode sheet and a negative electrode sheet that are separated and spaced by the diaphragm. A battery tab. The utility model has the advantages that the pole tabs are connected at both ends of the current collector through polar slurry to form a bipolar tab battery pole piece, thereby increasing the pole piece area, reducing the pole piece internal resistance and improving the conversion efficiency. The cell structure is formed by laminating the bipolar tabs. Due to the low internal resistance of the bipolar tabs, the internal resistance of the formed cell will naturally decrease, improving the energy conversion efficiency of the cell and improving the heating of the cell. The problem is that the battery can meet the needs of high current discharge.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a battery cell pole piece and a laminated battery cell structure.
Background
With the progress of economic globalization and the increasing demand for energy, finding new energy storage devices has become a focus of attention in the field related to new energy. The lithium ion battery with the advantages of no memory effect, small self-discharge, high energy density, long service life and the like is widely applied to the fields of electric automobiles, hybrid electric automobiles, portable mobile power supplies and the like. With the continuous development of lithium ion batteries and the development of application fields, the requirements of the field of large-current discharge on batteries are higher and higher. In the existing laminated lithium ion battery, in order to meet the requirement of improving the energy or power of a battery monomer, the number of the positive and negative pole pieces required is increased. When the positive pole and the negative pole adopt full lugs, a thick welding area is formed after the lugs are welded, and cold welding is easily caused.
The utility model discloses a utility model patent that publication number is CN201369367Y discloses the naked electric core of power lithium cell of bipolar ear structure, and its negative pole piece both ends set up long utmost point ear and short utmost point ear respectively, twine to be connected long utmost point ear and short utmost point ear behind the electric core to improve battery discharge performance, guarantee the welding stability of utmost point ear. Although the method provides a scheme of reducing the internal resistance through a bipolar lug structure, the scheme only increases the lug area of the negative plate, the internal resistance is still larger for the positive plate, and the bipolar lugs at the two ends of the negative plate are directly connected to be used as the negative electrode of the whole battery cell, when a plurality of battery cells are needed, the negative electrodes of the battery cells are inconvenient to be connected through welding, and when the energy density requirement is larger, the bipolar lugs of the negative plates are stacked at the same position, the requirement on the length of the bipolar lug of the negative plate at the outer side is higher, the welding difficulty is higher, and the problem of insufficient welding caused by the excessively thick lug cannot be effectively solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a battery cell pole piece structure capable of reducing the internal resistance of a battery and a battery cell structure obtained by laminating the pole pieces.
The utility model solves the technical problems through the following technical scheme: the utility model provides an electricity core pole piece, includes the mass flow body and coats the polarity thick liquids on the mass flow body, the same one side that the mass flow body both ends deviate central point to put is provided with the utmost point ear of being connected with polarity thick liquids respectively.
The utility model connects the pole lugs at the two ends of the current collector through the polar slurry to form the double-pole-lug battery cell pole piece, thereby increasing the area of the pole piece, reducing the internal resistance of the pole piece and improving the conversion efficiency.
Preferably, the tabs are covered on the polar slurry and connected with the current collector through ultrasonic welding, and the tabs at two ends of the current collector are the same in size.
Preferably, the current collector is an aluminum foil, the polar slurry is a positive electrode slurry, and the tab is a positive tab connected with the positive electrode slurry.
Preferably, the current collector is a copper foil, the polar slurry is a negative electrode slurry, and the tab is a negative electrode tab connected with the negative electrode slurry.
The utility model also provides a laminated cell structure, which comprises a Z-shaped folded diaphragm, and a positive plate and a negative plate which are arranged at intervals through the diaphragm, wherein the positive plate and the negative plate respectively comprise a current collector corresponding to the polarity and polarity slurry coated on the current collector; positive lugs and negative lugs at two ends of the battery cell are respectively stacked at the same position to form four battery cell lugs.
According to the utility model, the battery cell structure is formed by laminating the bipolar lug pole pieces, and the internal resistance of the formed battery cell is naturally reduced due to the lower internal resistance of the bipolar lug pole pieces, so that the energy conversion efficiency of the battery cell is improved, the heating problem of the battery cell is improved, and the battery can meet the requirement of large-current discharge.
Preferably, the negative electrode lugs stacked at the same position at the two ends of the battery core are respectively connected with a copper nickel-plated lug through ultrasonic welding, and the positive electrode lugs stacked at the same position at the two ends of the battery core are respectively connected with an aluminum lug through ultrasonic welding.
Preferably, the thickness of the aluminum tab is 0.4mm, and the thickness of the copper nickel-plated tab is 0.3 mm.
The battery cell pole piece and the laminated battery cell structure provided by the utility model have the advantages that: the two ends of the current collector are connected with the pole lugs through the polar slurry to form the double-pole-lug battery cell pole piece, so that the area of the pole piece is increased, the internal resistance of the pole piece is reduced, and the conversion efficiency is improved.
The battery core structure is formed by laminating the bipolar lug pole pieces, and the internal resistance of the formed battery core can be naturally reduced due to the lower internal resistance of the bipolar lug pole pieces, so that the energy conversion efficiency of the battery core is improved, the heating problem of the battery core is improved, and the battery can meet the requirement of large-current discharge.
Drawings
Fig. 1 is a schematic structural diagram of a cell pole piece according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a negative electrode sheet according to an embodiment of the present invention;
fig. 4 is a lamination schematic diagram of a laminated cell structure provided in an embodiment of the present invention;
fig. 5 is a schematic diagram of a laminated cell structure provided in an embodiment of the present invention;
fig. 6 is a schematic diagram of a laminated cell structure encapsulated with tabs according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below in detail and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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, the present embodiment provides a cell pole piece, including a current collector 1 and a polar slurry 2 coated on the current collector 1, and with reference to fig. 2 and fig. 3, a tab 3 connected with the polar slurry 2 is respectively disposed on the same side of the two ends of the current collector 1 deviating from the central position.
In the embodiment, the two ends of the current collector 1 are connected with the tabs 3 through the polarity slurry 2 to form the double-tab battery cell pole piece, so that the area of the pole piece is increased, the internal resistance of the pole piece is reduced, and the conversion efficiency is improved.
Further, for the positive plate 4 shown in fig. 2, the current collector 1 is made of aluminum foil, the polar slurry 2 is positive slurry, and the tab 3 is a positive tab 41 connected with the positive slurry; for the negative plate 5 shown in fig. 3, the current collector 1 is made of copper foil, the polar slurry 2 is negative slurry, and the tab 3 is a negative tab 51 connected with the negative slurry. The anode slurry comprises lithium iron phosphate or ternary nickel cobalt manganese, a conductive agent and a binder; the negative electrode slurry comprises a CMC binder, a conductive agent and SBR (styrene butadiene rubber).
In this embodiment, a further laminated cell structure using the above cell pole pieces is further provided, with reference to fig. 4, including a Z-shaped folded diaphragm 6 and a positive plate 4 and a negative plate 5 separated by the diaphragm 6 and disposed at an interval, where the positive plate 4 and the negative plate 5 are the structures introduced in the above embodiment, the positive tab and the negative tab at two ends of the cell are stacked at the same position to form four cell tabs, and the cell structure after lamination is as shown in fig. 5.
The battery core structure is formed by laminating the bipolar lug pole pieces, and because the internal resistance of the bipolar lug pole pieces is lower, the internal resistance of the formed battery core can be naturally reduced, the energy conversion efficiency of the battery core is improved, the heating problem of the battery core is improved, and the battery can meet the requirement of high-current discharge.
Referring to fig. 6, the negative electrode tab 51 stacked at the same position at both ends of the battery cell is respectively connected with a copper nickel-plated tab 71 by ultrasonic welding, the positive electrode tab 41 stacked at the same position at both ends of the battery cell is respectively connected with an aluminum tab 72 by ultrasonic welding, in this embodiment, the thickness of the aluminum tab 72 is 0.4mm, and the thickness of the copper nickel-plated tab 71 is 0.3 mm.
Two nickel plating of copper utmost point ear 71 and two aluminium system utmost point ears 72 of electric core both ends that this embodiment provided encapsulate alone after welding respectively, when electric core PACK joined in marriage the group, both sides join in marriage simultaneously and join in marriage mode such as group welding back rethread connecting plate or wire and connect out in unison, and need not reduce the bipolar ear lug at both ends, make things convenient for follow-up connection and equipment.
The positive and negative electrodes are respectively led out from the two ends of the laminated cell structure provided by the embodiment, so that the thickness of a pole lug lamination on one side is reduced, and the probability of the false welding possibly caused by the over-thick pole lug is reduced; compared with the traditional full-lug soft-package lithium ion battery, the internal resistance is reduced, the overall thickness of the positive and negative pole pieces after the lugs are overlapped is effectively reduced, and the battery packaging is facilitated.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A battery core pole piece is characterized in that: the current collector comprises a current collector and polar slurry coated on the current collector, wherein the same side of the two ends of the current collector, which deviates from the central position, is respectively provided with a lug connected with the polar slurry.
2. The cell pole piece of claim 1, wherein: the electrode lugs are covered on the polar slurry and connected with a current collector through ultrasonic welding, and the electrode lugs at the two ends of the current collector are the same in size.
3. The cell pole piece of claim 1, wherein: the current collector is an aluminum foil, the polar slurry is positive slurry, and the tab is a positive tab connected with the positive slurry.
4. The cell pole piece of claim 1, wherein: the current collector is copper foil, the polarity slurry is negative electrode slurry, and the tab is a negative electrode tab connected with the negative electrode slurry.
5. The utility model provides a lamination formula electricity core structure which characterized in that: the current collector comprises a Z-shaped folded diaphragm and a positive plate and a negative plate which are arranged at intervals through the diaphragm, wherein the positive plate and the negative plate respectively comprise a current collector corresponding to the polarity and polarity slurry coated on the current collector, and tabs connected with the polarity slurry are respectively arranged on the same sides of the two ends of the current collector, which deviate from the central position; positive lugs and negative lugs at two ends of the battery cell are respectively stacked at the same position to form four battery cell lugs.
6. The laminated cell structure of claim 5, wherein: the negative pole ear that electric core both ends were piled up in the same position passes through ultrasonic welding with a copper nickel plating utmost point ear respectively and is connected, and the positive pole ear that electric core both ends were piled up in the same position passes through ultrasonic welding with an aluminium system utmost point ear respectively and is connected.
7. The laminated cell structure of claim 6, wherein: the thickness of the aluminum tab is 0.4mm, and the thickness of the copper nickel-plated tab is 0.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122677862.6U CN216120429U (en) | 2021-11-03 | 2021-11-03 | Battery core pole piece and laminated battery core structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122677862.6U CN216120429U (en) | 2021-11-03 | 2021-11-03 | Battery core pole piece and laminated battery core structure |
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| Publication Number | Publication Date |
|---|---|
| CN216120429U true CN216120429U (en) | 2022-03-22 |
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| CN202122677862.6U Active CN216120429U (en) | 2021-11-03 | 2021-11-03 | Battery core pole piece and laminated battery core structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117832572A (en) * | 2022-09-29 | 2024-04-05 | 比亚迪股份有限公司 | Battery assembly method, battery and battery pack |
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2021
- 2021-11-03 CN CN202122677862.6U patent/CN216120429U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117832572A (en) * | 2022-09-29 | 2024-04-05 | 比亚迪股份有限公司 | Battery assembly method, battery and battery pack |
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Assignee: Shanghai Xuanyi New Energy Development Co.,Ltd. Assignor: Gotion High-tech Co., Ltd. Contract record no.: X2023980049293 Denomination of utility model: A type of battery cell electrode and stacked cell structure Granted publication date: 20220322 License type: Common License Record date: 20231207 |