CN220895576U - Multipolar ear lithium ion battery - Google Patents
Multipolar ear lithium ion battery Download PDFInfo
- Publication number
- CN220895576U CN220895576U CN202321245403.3U CN202321245403U CN220895576U CN 220895576 U CN220895576 U CN 220895576U CN 202321245403 U CN202321245403 U CN 202321245403U CN 220895576 U CN220895576 U CN 220895576U
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- CN
- China
- Prior art keywords
- negative electrode
- lug
- battery
- multipolar
- tab
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000003698 laser cutting Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 10
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 claims description 10
- 238000003466 welding Methods 0.000 abstract description 8
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000004804 winding Methods 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000003825 pressing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
A multi-lug lithium ion battery comprises a steel shell (1), a battery core (2), a battery anode cover plate (3) and a sealing piece (4); the battery cell (2) is provided with a negative electrode multipolar lug (21) formed by laser cutting, a negative electrode current collecting sheet (24) is welded on the negative electrode multipolar lug (21), and the negative electrode current collecting sheet (24) is welded on the inner bottom surface of the steel shell (1); the battery cell (2) is provided with a multi-lug positive electrode (22), the multi-lug positive electrode (22) is electrically connected with the battery positive electrode cover plate (3), and the sealing piece (4) is arranged between the battery positive electrode cover plate (3) and the upper end of the steel shell (1). The utility model can ensure that the anode multipolar lugs can be completely overlapped, is convenient for welding with the current collecting piece, and is convenient for later filling electrolyte.
Description
Technical Field
The utility model relates to the field of lithium batteries, in particular to a multi-lug lithium ion battery.
Background
The current lithium ion battery generates heat due to fewer lugs, the capacity of the battery is increased, the diameter of the battery is increased, and the heat is more serious. Therefore, there is a need for reducing the internal resistance of the battery to reduce heat generation while increasing the diameter of the battery. Currently, the common way to reduce the internal resistance of a battery is to use multiple tabs or full tabs. The internal resistance of the battery can be effectively reduced by adopting the full tab, but the full tab is easy to be in cold joint with the negative electrode current collecting piece after being flattened, and in addition, the gap of the battery core can be blocked after the full tab is flattened, so that the filling of electrolyte in the later stage is not facilitated. In the prior art, a method for manufacturing a plurality of lugs in a lithium ion battery generally cuts out a plurality of lugs on one side of an expanded electrode plate or welds the lugs, and then winds the lugs.
In order to solve the above problems, chinese patent document CN116053556a discloses a method for obtaining a tab die cutting parameter, a multi-tab cell winding method, a multi-tab cell and a battery, the obtaining method comprising: winding and hot-pressing the rolled and striped pole piece with foil to form a battery core; cutting the electrode lug area of the battery core to form electrode lugs according to the preset shape and size of the electrode lugs; disassembling the battery cells forming the tabs into pole pieces, and recording winding initial position information of the disassembled pole pieces; and measuring and obtaining the die cutting parameters of the polar lugs of the disassembled polar plates based on the winding initial position information of the polar plates. The method is adopted to obtain the tab die cutting parameters to die-cut the pole pieces, and the difference between the thickness of the pole pieces and the thickness of the test sample, the difference between the tightness degree during winding and other factors can be accepted in actual production, or the problem of uneven pairs of the multiple tabs of the battery core after winding exists.
Disclosure of utility model
The utility model aims to provide a manufacturing method of a multi-lug lithium ion battery cell and a manufacturing method of a battery, wherein negative multi-lug lithium ion battery cells can be completely overlapped together.
Another object of the utility model is: a multi-tab lithium ion battery is provided.
The technical scheme of the utility model is as follows:
the manufacturing method of the multi-lug lithium ion battery cell comprises the following steps:
S11, separating the positive pole piece and the negative pole piece by using a diaphragm, and winding the positive pole piece and the negative pole piece into a cylindrical battery core main body, wherein the negative pole end is a full-lug negative pole;
S12, cutting the all-tab negative electrode into at least one group of negative electrode multipolar tabs in a laser cutting mode, wherein all the negative electrode multipolar tabs form a neat multilayer laminated structure from the center hole to the outermost layer;
s13, folding and pressing or flattening the negative electrode multipolar lug towards the direction of the circle center hole;
And S14, welding a negative electrode current collecting plate on the folded or flattened negative electrode multipolar lug.
The utility model also provides a manufacturing method of the multi-lug lithium ion battery, which comprises the following steps:
s21, separating the positive pole piece and the negative pole piece by using a diaphragm, and winding the positive pole piece and the negative pole piece into a cylindrical battery cell, wherein the negative pole end is a full-tab negative pole;
S22, cutting the all-tab negative electrode into at least one group of negative electrode multipolar tabs in a laser cutting mode, wherein all the negative electrode multipolar tabs form a neat multilayer laminated structure from the center hole to the outermost layer;
s23, folding and pressing or flattening the negative electrode multipolar lug towards the direction of the circle center hole;
S24, welding a negative electrode current collecting plate on the folded or kneaded negative electrode multipolar lug;
s25, loading the cylindrical battery cell into a steel shell, and enabling the negative electrode current collecting piece to be pressed on the inner bottom surface of the steel shell; welding the negative electrode current collecting piece on the inner bottom surface of the steel shell by using a spot welder;
S26, electrically connecting the multi-lug positive electrode with a battery positive electrode cover plate, and arranging a sealing piece between the battery positive electrode cover plate and the upper end of the steel shell to form the multi-lug lithium ion battery.
As an improvement to the utility model, the laser cutting mode adopts laser to cut the cathode of the full tab into three parts of left, middle and right along the axial direction of the battery core, wherein the width of the middle part is larger than or equal to the diameter of the center hole; cutting the left part and the right part along the radial direction of the battery cell by adopting laser; and cutting off one half of the middle part along the radial direction of the battery cell, and only the other half of the middle part is reserved.
As an improvement of the utility model, the laser cutting mode is to cut the cathode of the full tab into three parts of left, middle and right along the axial direction of the battery cell by adopting laser, then cut the middle part and keep the rest tab.
As an improvement of the utility model, the laser is adopted to cut the residual tab into three parts along the axial direction of the battery core perpendicular to the cut middle part, then the second middle part formed by the second cutting is cut off, and the residual parts of four corners are reserved.
When the wound positive electrode of the cylindrical battery core is a full-electrode positive electrode lug, the positive electrode multi-electrode lug can be cut by a method of cutting the full-electrode negative electrode lug.
The utility model also provides a multi-lug lithium ion battery which is manufactured by the manufacturing method of the multi-lug lithium ion battery.
The utility model also provides a multi-lug lithium ion battery, which comprises a steel shell, a battery core, a battery anode cover plate and a sealing piece; the battery cell is provided with a negative electrode multipolar lug formed by laser cutting, a negative electrode current collecting piece is welded on the negative electrode multipolar lug, and the negative electrode current collecting piece is welded on the inner bottom surface of the steel shell; the battery cell is provided with a multipolar lug positive electrode, the multipolar lug positive electrode is electrically connected with a battery positive electrode cover plate, and the sealing piece is arranged between the battery positive electrode cover plate and the upper end of the steel shell 1.
As an improvement to the utility model, the seal is an annular seal.
As an improvement to the utility model, the negative electrode multipolar tab and the negative electrode current collector tab are laser welded.
As an improvement of the present utility model, the negative current collecting tab is spot welded to the inner bottom surface of the steel can.
As an improvement to the utility model, the seal is made of silicone or rubber.
The utility model firstly winds the pole piece to form the full-lug negative electrode or/and full-lug positive electrode, and then prepares the negative electrode multipolar lug or/and positive electrode multipolar lug by a die cutting mode, thus ensuring that the negative electrode multipolar lug can be completely overlapped, being convenient for welding with a current collecting piece and being convenient for later filling electrolyte.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of a method for manufacturing a battery cell according to the present utility model.
Fig. 2 is a schematic structural diagram of an embodiment of a method for manufacturing a battery according to the present utility model.
Fig. 3 is a schematic structural view of a first embodiment of the present utility model after the cells are cut.
Fig. 4 is a schematic structural diagram of a second embodiment of the present utility model after the cells are cut.
Fig. 5 shows a third embodiment of the present utility model after the cells are cut.
Fig. 6 is a partially cross-sectional structural schematic view of a battery in the present utility model.
Detailed Description
The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1 and fig. 3-5, fig. 1 and fig. 3-5 disclose a method for manufacturing a multi-tab lithium ion battery cell, comprising the steps of:
S11, separating the positive pole piece and the negative pole piece by using a diaphragm, and winding the positive pole piece and the negative pole piece into a cylindrical battery core main body, wherein the negative electrode end is a full-tab negative electrode and/or the positive electrode end is a full-tab positive electrode;
S12, cutting the all-tab negative electrode into at least one group of negative electrode multipolar tabs in a laser cutting mode, wherein all the negative electrode multipolar tabs form a neat multilayer laminated structure from the center hole to the outermost layer;
S13, folding or flattening the negative electrode multipolar lugs towards the direction of the circle center hole, wherein the folding and pressing can be performed by adopting a mechanical method or a manual method;
And S14, welding a negative electrode current collecting piece on the folded or flattened negative electrode multipolar lug, wherein the negative electrode current collecting piece can be a nickel piece or a copper piece.
Preferably, the laser cutting mode is to cut the cathode of the all-tab into a left part, a middle part and a right part along the axial direction of the battery cell by adopting laser, wherein the width of the middle part is larger than or equal to the diameter of the center hole; cutting the left part and the right part along the radial direction of the battery cell by adopting laser; and cutting off one half of the middle part along the radial direction of the battery cell, and only the other half of the middle part is reserved.
Preferably, the laser cutting mode is to cut the cathode of the full tab into three parts of left, middle and right along the axial direction of the battery cell by adopting laser, then cut the middle part and keep the rest tab.
Preferably, the middle part cut is perpendicular to the cut middle part, the residual tab is cut into three parts along the axial direction of the battery cell by adopting laser, and then the second middle part formed by the second cutting is cut, so that the residual parts at four corners are reserved.
When the wound positive electrode of the cylindrical battery core is a full-tab positive electrode, the multi-tab positive electrode can also be cut by a method for cutting the full-tab negative electrode tab, and the cutting method of the multi-tab positive electrode is not described herein.
Referring to fig. 2 and fig. 3-5, fig. 2 and fig. 3-5 disclose a method for manufacturing a multi-pole ear lithium ion battery according to the present utility model, which comprises the following steps:
S21, separating the positive pole piece and the negative pole piece by using a diaphragm, and winding the positive pole piece and the negative pole piece into a cylindrical battery cell, wherein the negative pole end is a full-tab negative pole and/or the positive pole end is a full-tab positive pole;
S22, cutting the all-tab negative electrode into at least one group of negative electrode multipolar tabs in a laser cutting mode, wherein all the negative electrode multipolar tabs form a neat multilayer laminated structure from the center hole to the outermost layer;
S23, folding or flattening the negative electrode multipolar lugs towards the direction of the circle center hole, wherein the folding and pressing can be performed by a mechanical method or a manual method;
S24, welding a negative electrode current collecting piece on the folded or flattened negative electrode multipolar lug, wherein the negative electrode current collecting piece can be a nickel piece or a copper piece;
s25, loading the cylindrical battery cell into a steel shell, and enabling the negative electrode current collecting piece to be pressed on the inner bottom surface of the steel shell; welding the negative electrode current collecting piece on the inner bottom surface of the steel shell by using a spot welder;
S26, electrically connecting the multi-lug positive electrode with a battery positive electrode cover plate, and arranging a sealing piece between the battery positive electrode cover plate and the upper end of the steel shell to form the multi-lug lithium ion battery.
Preferably, the laser cutting mode is to cut the cathode of the all-tab into a left part, a middle part and a right part along the axial direction of the battery cell by adopting laser, wherein the width of the middle part is larger than or equal to the diameter of the center hole; cutting the left part and the right part along the radial direction of the battery cell by adopting laser; and cutting off one half of the middle part along the radial direction of the battery cell, and only the other half of the middle part is reserved.
Preferably, the laser cutting mode is to cut the cathode of the full tab into three parts of left, middle and right along the axial direction of the battery cell by adopting laser, then cut the middle part and keep the rest tab.
Preferably, the middle part cut is perpendicular to the cut middle part, the residual tab is cut into three parts along the axial direction of the battery cell by adopting laser, and then the second middle part formed by the second cutting is cut, so that the residual parts at four corners are reserved.
When the wound positive electrode of the cylindrical battery core is a full-tab positive electrode, the multi-tab positive electrode can also be cut by a method for cutting the full-tab negative electrode tab, and the cutting method of the multi-tab positive electrode is not described herein.
The utility model also provides a multi-lug lithium ion battery which is manufactured by the manufacturing method of the multi-lug lithium ion battery.
Referring to fig. 6, the utility model further provides a multi-lug lithium ion battery, which comprises a steel shell 1, an electric core 2, a battery anode cover plate 3 and a sealing piece 4; the battery cell 2 is provided with a negative electrode multipolar lug 21 formed by laser cutting, a negative electrode current collecting plate 24 is welded on the negative electrode multipolar lug 21, and the negative electrode current collecting plate 24 is welded on the inner bottom surface of the steel shell 1; the battery core 2 is provided with a multi-lug positive electrode 22, the multi-lug positive electrode 22 is electrically connected with the battery positive electrode cover plate 3, and the sealing piece 4 is arranged between the battery positive electrode cover plate 3 and the upper end of the steel shell 1. Of course, the present embodiment may also be designed to: an anode current collecting piece 5 is arranged between the multipolar lug anode 22 and the battery anode cover plate 3, the anode current collecting piece 5 is electrically connected with the battery anode cover plate 3, and the anode current collecting piece 5 can be a nickel piece.
Preferably, the seal 4 is an annular seal.
Preferably, the negative electrode multipolar tab 21 and the negative electrode collector tab 24 are laser welded.
Preferably, the negative current collecting tab 24 is spot welded to the inner bottom surface of the steel can 1.
Preferably, the seal 4 is made of silicone or rubber.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (4)
1. A multi-lug lithium ion battery comprises a steel shell (1), a battery core (2), a battery anode cover plate (3) and a sealing piece (4); the battery cell (2) is provided with a negative electrode multipolar lug (21) formed by laser cutting, a negative electrode current collecting plate (24) is welded on the negative electrode multipolar lug (21), and the negative electrode current collecting plate (24) is welded on the inner bottom surface of the steel shell (1); the battery cell (2) is provided with a multi-lug positive electrode (22), the multi-lug positive electrode (22) is electrically connected with the battery positive electrode cover plate (3), and the sealing piece (4) is arranged between the battery positive electrode cover plate (3) and the upper end of the steel shell (1).
2. The multi-polar lithium ion battery according to claim 1, wherein the seal (4) is an annular seal.
3. A multi-tab lithium ion battery according to claim 1 or 2, characterized in that the negative electrode multi-tab (21) and the negative electrode current collector (24) are laser welded.
4. The multi-tab lithium ion battery of claim 1 or 2 wherein the negative current collector (24) is spot welded to the inner bottom surface of the steel can (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321245403.3U CN220895576U (en) | 2023-05-23 | 2023-05-23 | Multipolar ear lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321245403.3U CN220895576U (en) | 2023-05-23 | 2023-05-23 | Multipolar ear lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220895576U true CN220895576U (en) | 2024-05-03 |
Family
ID=90841446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321245403.3U Active CN220895576U (en) | 2023-05-23 | 2023-05-23 | Multipolar ear lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220895576U (en) |
-
2023
- 2023-05-23 CN CN202321245403.3U patent/CN220895576U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant |