CN220358280U - Multipolar ear cylinder lithium ion battery cell structure - Google Patents
Multipolar ear cylinder lithium ion battery cell structure Download PDFInfo
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- CN220358280U CN220358280U CN202320938474.5U CN202320938474U CN220358280U CN 220358280 U CN220358280 U CN 220358280U CN 202320938474 U CN202320938474 U CN 202320938474U CN 220358280 U CN220358280 U CN 220358280U
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- Prior art keywords
- negative electrode
- tab
- positive electrode
- battery cell
- welding
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- 239000007773 negative electrode material Substances 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011889 copper foil Substances 0.000 claims abstract description 6
- 239000011888 foil Substances 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 84
- 239000007774 positive electrode material Substances 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 230000005405 multipole Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000010406 cathode material Substances 0.000 description 2
- 239000003571 electronic cigarette Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- DOCYQLFVSIEPAG-UHFFFAOYSA-N [Mn].[Fe].[Li] Chemical compound [Mn].[Fe].[Li] DOCYQLFVSIEPAG-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a multipolar ear cylindrical lithium ion battery cell structure, wherein the battery cell is formed by winding four layers of materials of a negative plate, a diaphragm, a positive plate and a diaphragm from outside to inside into a cylinder; the negative electrode plate is made of copper foil, and the positive electrode plate is made of aluminum foil; the negative electrode plate is coated with a negative electrode material covering area, the area of the negative electrode material covering area is smaller than that of the negative electrode plate, and the transverse length and the longitudinal length of the negative electrode material covering area are smaller than that of the diaphragm. The utility model greatly reduces the process difficulty and further reduces the production cost, and can directly weld the lugs on the copper foil of the negative electrode current collector at the two ends of the battery core and the aluminum foil of the positive electrode current collector, and form a connecting parallel structure between the end parts of the negative electrode full lug and the positive electrode full lug, so that the internal resistance of the battery core can be reduced, the capacity design of the high-rate battery is increased, the energy density of the high-rate battery is improved, the power performance is ensured by lowering the temperature rise, and the safety performance is ensured.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a multi-lug cylindrical lithium ion battery cell structure.
Background
Since the successful development of lithium ion batteries using carbon materials as negative electrodes by sony corporation in japan in 1991, lithium ion batteries have rapidly been developed to industrialization, and the lithium ion batteries have the advantages of high energy density, safety, environmental protection, long cycle times, diversified external dimensions, and the like, and are now widely used in power supply devices such as mobile phones, video cameras, notebook computers, portable electrical appliances, electric tools, medical appliances, and electric vehicles. In recent years, the market of electronic cigarettes is mature, the types are various, corresponding lithium ion batteries are various, the lithium ion batteries have square and round shapes, cylindrical batteries have more types and different diameters, most of electric bicycles and electric tools adopt steel shell cylindrical images 18650, 21700 and the like, and the cylindrical battery cells are all power-multiplying battery cells whether polymer or steel shell. In recent years, enterprises mainly based on tesla push out 46800 full-tab design cell structures, which have high volume energy density, low internal resistance and high power density, and are easy to realize mass production and mass production. However, the existing cylindrical lithium battery is mostly realized by welding a round current collecting disc at the end part of the battery cell, and the end part of the battery cell is required to be very flat when the current collecting disc is welded, so that the process difficulty is increased, and the production cost is further increased. The battery core with the multiplying power required by electronic cigarettes, electric bicycles, electric tools and the like is required to realize temperature rise control, energy density control and power performance not have good structural design.
Disclosure of Invention
In order to solve the problem that the process difficulty of welding a current collecting disc at the end part of the conventional cylindrical lithium battery is high, the utility model provides a multi-lug cylindrical lithium ion battery cell structure.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the battery core is formed by winding four layers of materials of a negative plate, a diaphragm, a positive plate and a diaphragm from outside to inside in sequence into a cylinder; the negative electrode plate is made of copper foil, and the positive electrode plate is made of aluminum foil; the negative electrode plate is coated with a negative electrode material covering area, the area of the negative electrode material covering area is smaller than that of the negative electrode plate, and the transverse length and the longitudinal length of the negative electrode material covering area are smaller than that of the diaphragm; the battery cell comprises a battery cell, wherein a positive electrode plate is coated with a positive electrode material covering area, the area of the positive electrode material covering area is smaller than that of the positive electrode plate, the area of the positive electrode material covering area is smaller than that of a negative electrode material covering area, the upper end and the lower end of the battery cell are respectively a negative electrode full tab and a positive electrode full tab which are formed by left-over negative electrode plates and positive electrode plate end parts, the end parts of the negative electrode full tab and the positive electrode full tab are respectively welded with a negative electrode welding tab and a positive electrode welding tab, and insulating sheets are arranged at the positions of the negative electrode full tab and the positive electrode full tab.
Preferably, the active material of the negative electrode coating region is made of graphite or a combination of graphite and silicon carbon/silicon oxygen, and the active material of the positive electrode coating region is made of one or more of lithium cobaltate, ternary material, lithium manganate, lithium iron and lithium manganese iron.
Preferably, the negative electrode welding tab and the positive electrode welding tab are square or round nickel strips, aluminum strips or copper-nickel composite strips.
Preferably, the insulating sheet adopts an integrally formed wafer, a lug hole is reserved in the middle, and an opening communicated with the lug hole is formed in one side of the insulating sheet, or a mode that adhesive paper is used for sticking part or all of the insulating sheet to realize end surface insulation and insulating glue is coated on two sides of the battery cell to perform insulation is adopted.
Preferably, the negative electrode welding tab is welded at the end part of the negative electrode full tab, and then is bent upwards by 90 degrees at the center of the battery cell to pass through the tab hole on the insulating sheet; the positive electrode welding lug is welded at the end part of the positive electrode full lug, and then is bent downwards at the center of the battery cell by 90 degrees to penetrate through the lug hole on the insulating sheet.
Preferably, the negative electrode welding tab is welded at a blank on one side of the negative electrode plate and extends out of the negative electrode plate, after the battery cell is wound, a section of negative electrode welding tab extending outwards is bent for 90 degrees to be welded with the negative electrode full tab, and then the section of negative electrode welding tab is bent upwards for 90 degrees at the center of the battery cell to pass through a tab hole in the insulating plate; the positive electrode welding tab is welded at a blank on one side of the positive electrode plate and extends out of the positive electrode plate, after the battery core is wound, a section of positive electrode welding tab extending outwards is bent for 90 degrees to be welded with the positive electrode full tab, and then the positive electrode welding tab is bent downwards for 90 degrees at the center of the battery core to penetrate through a tab hole in the insulating plate; the positive electrode welding tab and the negative electrode welding tab can form any included angle.
Preferably, the welding length interval between the negative electrode welding tab and the positive electrode welding tab and between the negative electrode full tab and the positive electrode full tab is equal to or more than the end face circle radius of the battery cell and equal to or less than the end face circle diameter of the battery cell.
Preferably, the welding parts of the negative electrode welding lug, the positive electrode welding lug, the negative electrode full lug and the positive electrode full lug are in a cross shape.
Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, active substances are not coated at one ends of the negative electrode plate and the positive electrode plate, and the negative electrode full tab and the positive electrode full tab are formed after the battery cell is wound, so that the negative electrode full tab and the positive electrode full tab are kneaded to a certain extent, the tabs can be kneaded in a reverse direction to the circle center, and also can be randomly arranged, the direction is not certain, compared with a mode of welding a current collecting plate, the kneading process requirement is not high, the process difficulty is greatly reduced, and the production cost is further reduced. And then, the electrode lugs can be directly welded on the full electrode lugs of the negative electrode and the full electrode lugs of the positive electrode, and the end parts of the full electrode lugs of the negative electrode and the end parts of the full electrode lugs of the positive electrode are connected in parallel, so that the internal resistance of the battery core can be reduced, the capacity design of the high-rate battery is increased, the energy density of the high-rate battery is improved, the bottom temperature rise is reduced, the power performance is ensured, and the safety performance is ensured.
Drawings
FIG. 1 is a schematic view of a pole piece winding manner according to an embodiment of the present utility model;
fig. 2 is a schematic view of an expanded structure of a negative electrode sheet according to a first embodiment of the present utility model;
FIG. 3 is a schematic view showing an expanded structure of a positive electrode sheet according to a first embodiment of the present utility model;
fig. 4 is a schematic diagram of a welding mode of positive and negative electrode welding lugs according to the first embodiment of the utility model;
FIG. 5 is a schematic top view of the battery cell of FIG. 4;
FIG. 6 is a schematic structural view of an insulating sheet according to an embodiment of the present utility model;
fig. 7 is a schematic view of an expanded structure of a negative electrode sheet according to a second embodiment of the present utility model;
FIG. 8 is a schematic view of an expanded structure of a positive electrode sheet according to a second embodiment of the present utility model;
FIG. 9 is a schematic diagram showing the relative positions of the first positive and negative electrode welding lugs according to the second embodiment of the present utility model;
FIG. 10 is a schematic diagram showing the relative positions of a second positive and negative electrode welding tab according to a second embodiment of the present utility model;
FIG. 11 is a schematic diagram illustrating a welding mode of positive and negative electrode welding lugs according to a third embodiment of the present utility model;
FIG. 12 is a schematic top view of FIG. 11;
FIG. 13 is a schematic top view illustrating the shape of a tab for welding positive and negative electrodes in a fourth embodiment of the present utility model;
fig. 14 is a table of performance versus data for a conventional monopole ear design cell and a multipole ear design cell of the present utility model.
In the figure: 1. the cathode plate, 101, a cathode full tab, 102, a cathode material covering area, 2, a cathode plate, 201, a cathode full tab, 202, a cathode material covering area, 3, a diaphragm, 4, a cathode welding tab, 5, a cathode welding tab, 6, an insulating sheet, 601, a tab hole, 602 and an opening.
Detailed Description
In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present 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.
Examples
As shown in fig. 1 to 6, the battery cell in the first embodiment of the present utility model is wound into a cylindrical shape from four layers of materials including a negative electrode sheet 1, a separator 3, a positive electrode sheet 2 and a separator 3 in order from the outside to the inside; the negative plate 1 is made of copper foil, and the positive plate 2 is made of aluminum foil; the negative electrode sheet 1 is coated with a negative electrode material covering region 102, the area of the negative electrode material covering region 102 is smaller than that of the negative electrode sheet 1, and the transverse and longitudinal lengths of the negative electrode material covering region 102 are smaller than that of the diaphragm 3; the positive plate 2 is coated with a positive electrode material covering area 202, the area of the positive electrode material covering area 202 is smaller than that of the positive electrode 2, the area of the positive electrode material covering area 202 is smaller than that of the negative electrode material covering area 102, the upper end and the lower end of the battery core are respectively provided with a negative electrode full tab 101 and a positive electrode full tab 201 which are formed by the left negative electrode plate 1 and the end of the positive electrode plate 2, the end parts of the negative electrode full tab 101 and the positive electrode full tab 201 are respectively welded with a negative electrode welding tab 4 and a positive electrode welding tab 5, and the negative electrode full tab 101 and the positive electrode full tab 201 are respectively provided with an insulating sheet 6; the cathode welding tab 4 is welded to the end part of the cathode full tab 101, and then is bent upwards by 90 degrees at the center of the battery cell to pass through the tab hole 601 on the insulating sheet 6; the positive electrode welding tab 5 is welded to the end of the positive electrode full tab 201, and then is bent downwards at the center of the battery core by 90 degrees to pass through the tab hole 601 on the insulating sheet 6.
Preferably, the active material of the negative electrode coating region 102 is made of graphite, and the active material of the positive electrode coating region 202 is made of lithium cobaltate; the cathode welding electrode lug 4 is a square nickel strap, and the anode welding electrode lug 5 is a square aluminum strap; the insulating sheet 6 is an integrally formed wafer, the middle of which is provided with a lug hole 601, and one side of which is provided with an opening 602 communicated with the lug hole 601.
After the battery cell is wound, one end is a cathode full tab 101 formed by the left copper foil, the other end is an anode full tab 201 formed by the left aluminum foil, both ends are kneaded to a certain extent, the tabs can be kneaded to the circle center in a reverse direction, the directions are not necessarily disordered, and compared with the mode of welding a current collecting disc, the kneading process requirement is not high, so that the process difficulty is greatly reduced, and the production cost is further reduced. After both ends of the battery cell are kneaded and flattened, nickel strips can be directly welded on the negative electrode full tab 101, aluminum strips are welded on the positive electrode full tab 201, a negative electrode welding tab 4 and a positive electrode welding tab 5 are formed, and the end parts of the negative electrode full tab 101 and the positive electrode full tab 201 are respectively connected in parallel, so that the internal resistance of the battery cell can be reduced. After the electrode lugs are welded, insulating sheets 6 are attached to the two end parts, then an aluminum plastic film is used for wrapping the battery cells, or a steel shell and an aluminum shell are used for wrapping the battery cells, so that a cylindrical lithium ion battery can be formed, when the steel shell or the aluminum shell is used for wrapping the battery cells, the welding electrode lugs at the bottom are not bent downwards, but contact with the steel shell or the aluminum shell through the insulating sheets 6, and the bottom is welded by adopting laser, resistance welding or other means.
Examples
As shown in fig. 7 to 10, on the basis of the first embodiment, the negative electrode tab 1 and the positive electrode tab 2 are also left at one side, the negative electrode welding tab 4 is welded at the left side of the negative electrode tab 1 and extends out of the negative electrode tab 1, after the winding of the battery cell is completed, a section of the negative electrode welding tab 4 extending outwards is bent for 90 ° to be welded with the negative electrode full tab 101, and then is bent for 90 ° upwards at the center of the battery cell to pass through the tab hole 601 on the insulating sheet 6; the positive electrode welding tab 5 is welded at a blank on one side of the positive electrode plate 2 and extends out of the positive electrode plate 2, after the battery core is wound, a section of positive electrode welding tab 5 extending outwards is bent for 90 degrees to be welded with the positive electrode full tab 201, and then is bent downwards for 90 degrees at the center of the battery core to pass through a tab hole 601 on the insulating plate 6;
compared with the method of directly welding the tabs at the ends of the cathode full tab 101 and the anode full tab 201, the method of welding the tabs at the blank on one side of the cathode sheet 1 and the anode sheet 2 can be more convenient for positioning the tabs welded at the ends of the cathode full tab 101 and the anode full tab 201 after winding is completed. The positive electrode welding tab 5 and the negative electrode welding tab 4 can be any included angle, as shown in fig. 9, the positive electrode welding tab 5 and the negative electrode welding tab 4 can be 180-degree included angle, at the moment, an aluminum plastic film can be adopted to package the battery cell, a steel shell or an aluminum shell can also be adopted to package the battery cell, as shown in fig. 10, the positive electrode welding tab 5 and the negative electrode welding tab 4 are positioned on the same side, at the moment, the steel shell or the aluminum shell is adopted to package the battery cell better, and planning can be performed in advance according to actual production requirements.
Examples
As shown in fig. 11 and 12, on the basis of the first embodiment or the second embodiment, the welding lengths of the negative electrode welding tab 4 and the positive electrode welding tab 5 and the negative electrode full tab 101 and the positive electrode full tab 201 are equal to the end face circle diameter of the battery cell, taking the negative electrode welding tab 4 as an example, after being welded with the end face of the negative electrode full tab 101, the negative electrode welding tab 4 is bent 180 ° towards the center of the battery cell, and is bent upwards 90 ° at the center of the battery cell to pass through the tab hole 601 on the insulating sheet 6, so that the negative electrode full tab 101 or the positive electrode full tab 102 of the end face of the whole battery cell can be connected in parallel, and the internal resistance is further reduced.
Examples
As shown in fig. 13, on the basis of the first embodiment or the second embodiment, the welding parts of the cathode welding tab 4 and the anode welding tab 5 and the cathode full tab 101 and the anode full tab 201 are in a cross shape, so that the welding operation is more convenient.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The battery core is formed by winding four layers of materials of a negative plate, a diaphragm, a positive plate and a diaphragm from outside to inside in sequence into a cylinder; the negative electrode plate is made of copper foil, and the positive electrode plate is made of aluminum foil; the negative electrode plate is coated with a negative electrode material covering area, the area of the negative electrode material covering area is smaller than that of the negative electrode plate, and the transverse length and the longitudinal length of the negative electrode material covering area are smaller than those of the diaphragm; the battery cell comprises a battery cell, wherein a positive electrode plate is coated with a positive electrode material covering area, the area of the positive electrode material covering area is smaller than that of the positive electrode plate, the area of the positive electrode material covering area is smaller than that of a negative electrode material covering area, the upper end and the lower end of the battery cell are respectively a negative electrode full tab and a positive electrode full tab which are formed by left-over negative electrode plates and positive electrode plate end parts, the end parts of the negative electrode full tab and the positive electrode full tab are respectively welded with a negative electrode welding tab and a positive electrode welding tab, and insulating sheets are arranged at the positions of the negative electrode full tab and the positive electrode full tab.
2. The multi-pole cylindrical lithium ion battery cell structure according to claim 1, wherein: the negative electrode welding tab and the positive electrode welding tab are square or round nickel strips, aluminum strips or copper-nickel composite strips.
3. The multi-pole cylindrical lithium ion battery cell structure according to claim 2, wherein: the insulating sheet adopts an integrally formed wafer, a lug hole is reserved in the middle of the insulating sheet, and an opening communicated with the lug hole is formed in one side of the insulating sheet, or an end surface insulation mode is realized by sticking part or all of the insulating sheet with gummed paper, and insulating glue is coated on two sides of the battery cell for insulation.
4. A multi-pole cylindrical lithium ion battery cell structure according to claim 3, wherein: the negative electrode welding tab is welded to the end part of the negative electrode full tab, and then is bent upwards by 90 degrees at the center of the battery cell to pass through a tab hole on the insulating sheet; the positive electrode welding lug is welded at the end part of the positive electrode full lug, and then is bent downwards at the center of the battery cell by 90 degrees to penetrate through the lug hole on the insulating sheet.
5. The multi-pole cylindrical lithium ion battery cell structure according to claim 4, wherein: the negative electrode welding tab is welded at a blank on one side of the negative electrode plate and extends out of the negative electrode plate, after the battery cell is wound, a section of negative electrode welding tab extending outwards is bent for 90 degrees to be welded with the negative electrode full tab, and then the section of negative electrode welding tab is bent upwards for 90 degrees at the center of the battery cell to pass through a tab hole in the insulating plate; the positive electrode welding tab is welded at a blank on one side of the positive electrode plate and extends out of the positive electrode plate, after the battery core is wound, a section of positive electrode welding tab extending outwards is bent for 90 degrees to be welded with the positive electrode full tab, and then the positive electrode welding tab is bent downwards for 90 degrees at the center of the battery core to penetrate through a tab hole in the insulating plate; the positive electrode welding tab and the negative electrode welding tab can form any included angle.
6. The multi-pole cylindrical lithium ion battery cell structure according to claim 4 or 5, wherein: the welding length interval between the negative electrode welding lug and the positive electrode welding lug and between the negative electrode full lug and the positive electrode full lug is equal to or more than the end face circle radius of the battery cell and equal to or less than the end face circle diameter of the battery cell.
7. The multi-pole cylindrical lithium ion battery cell structure of claim 6, wherein: and the welding parts of the negative electrode welding lug, the positive electrode welding lug, the negative electrode full lug and the positive electrode full lug are in a cross shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320938474.5U CN220358280U (en) | 2023-04-24 | 2023-04-24 | Multipolar ear cylinder lithium ion battery cell structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320938474.5U CN220358280U (en) | 2023-04-24 | 2023-04-24 | Multipolar ear cylinder lithium ion battery cell structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220358280U true CN220358280U (en) | 2024-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320938474.5U Active CN220358280U (en) | 2023-04-24 | 2023-04-24 | Multipolar ear cylinder lithium ion battery cell structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220358280U (en) |
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2023
- 2023-04-24 CN CN202320938474.5U patent/CN220358280U/en active Active
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