CN220585432U - Diaphragm, multipolar ear cell and lithium ion battery thereof - Google Patents
Diaphragm, multipolar ear cell and lithium ion battery thereof Download PDFInfo
- Publication number
- CN220585432U CN220585432U CN202322130050.9U CN202322130050U CN220585432U CN 220585432 U CN220585432 U CN 220585432U CN 202322130050 U CN202322130050 U CN 202322130050U CN 220585432 U CN220585432 U CN 220585432U
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- China
- Prior art keywords
- diaphragm
- battery
- functional coating
- coating
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 239000011888 foil Substances 0.000 claims abstract description 28
- 239000010410 layer Substances 0.000 claims abstract description 11
- 239000000919 ceramic Substances 0.000 claims abstract description 10
- 239000011247 coating layer Substances 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims abstract description 3
- 239000012528 membrane Substances 0.000 claims description 8
- 238000003475 lamination Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229910001593 boehmite Inorganic materials 0.000 claims description 3
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 229920001083 polybutene Polymers 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims 1
- 229910002706 AlOOH Inorganic materials 0.000 claims 1
- 229910002367 SrTiO Inorganic materials 0.000 claims 1
- 229910010413 TiO 2 Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052744 lithium Inorganic materials 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 230000005405 multipole Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 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 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003466 welding 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model provides a diaphragm, a multi-electrode lug battery cell and a lithium ion battery, wherein the diaphragm has different thicknesses in the width direction and comprises a diaphragm main body, the diaphragm main body is also coated and fixed with a functional coating, the functional coating is a ceramic insulating layer and/or a glue coating layer and is used for increasing the thickness or strength of the diaphragm in the width direction, the multi-electrode lug battery cell and the lithium ion battery both adopt the diaphragm, the short circuit risk caused by the penetration of burrs at the edge of a foil electrode lug through the diaphragm can be avoided, the air permeability of a thickened area at the top of the diaphragm can be reduced, the lithium ion transmission speed can be reduced under the condition of high current density, the problem of lithium precipitation at the edge area of a negative electrode plate in the circulation process can be favorably reduced, the thickness of the top of the battery can be compensated, the formed top interface is well pasted, and the safety performance of the battery is further improved.
Description
Technical Field
The utility model relates to the technical field of battery parts, in particular to a diaphragm, a multi-lug battery cell and a lithium ion battery.
Background
Along with the increasing intelligence of consumer products and the increasing demands of consumers on various functions of the products, the capacity of lithium ion batteries is required to be higher, the main development direction of smart phones is to increase the charging speed at present, wherein the multi-lug battery core structure comprises a multi-lug winding structure and a multi-lug lamination structure which are widely applied, the multi-lug structure greatly reduces the internal resistance and the temperature rise performance of the battery, but the multi-lug structure needs to cut out foil lugs on an aluminum foil or copper foil current collector to realize the quick charging purpose, and in order to ensure that the positive and negative foil lugs do not penetrate through a diaphragm to cause short circuit risks, the technical routes of other manufacturers are to carry out the coating of a ceramic insulating layer, the pasting of an adhesive tape and the like on a positive plate and a negative plate, so that the risk of short circuit caused by current collector cutting burrs is avoided when the foil lugs are pre-welded or folded.
However, in general, the ceramic layers are coated on the positive and negative plates, special coating gaskets are needed, and the sizes of the battery core gaskets of different products are different, so that a large amount of tooling is consumed, the cost is high, and the sample preparation period is correspondingly increased.
In addition, in the multi-lug welding process, the edges of the lugs at the edges cannot be cut to cut off corner materials, particularly the positions of the foil lugs belong to the positions with the maximum current density, the thickness of the cell head is thinner than that of other positions due to the fact that the side edges of the cathode foil lugs are thinner, poor head interface is formed after formation, lithium is separated in advance in the circulation process, and the requirement of the battery circulation life cannot be met.
Disclosure of Invention
The utility model aims to provide a diaphragm.
Another technical problem to be solved by the present utility model is to provide a multipolar ear cell comprising the above-mentioned membrane.
Another technical problem to be solved by the present utility model is to provide a lithium ion battery comprising the multi-tab cell.
The technical scheme adopted by the utility model is as follows:
the utility model provides a diaphragm, thickness is different in width direction, includes the diaphragm main part, still be coated on the diaphragm main part and be fixed with functional coating, functional coating is ceramic insulating layer and/or rubber coating layer for increase the thickness of diaphragm or increase intensity in width direction.
Preferably, the coating fixing position of the functional coating of the diaphragm is the edge of the diaphragm main body (single-sided coating or double-sided coating).
Preferably, the position of the functional coating corresponds to the positions of the positive electrode foil tab and the negative electrode foil tab when the multipolar tab battery cell is assembled, so that the burrs of the foil tab correspond to the high-thickness, high-hardness and high-strength diaphragm areas, and the safety performance of the multipolar tab battery cell is improved.
Preferably, the insulating material used for the ceramic insulating layer is A l 2 O 3 、A l OOH、SiO 2 、T iO 2 、ZrO 2 、SnO 2 、MgO、ZnO、CaO、CeO 2 、Y 2 O 3 、BaT i O 3 、SrT iO 3 Boehmite, polybutene and polyethylene adhesives.
Preferably, the thickness t1 of the functional coating layer of the diaphragm is 1-20um.
Preferably, in the separator, the width d1= (D1-D2)/2+a of the coating region of the functional coating layer, wherein D1 is the whole width of the separator, D2 is the width of the positive electrode sheet, and a is in the range of 0-10mm.
Preferably, the puncture strength of the thickened region of the diaphragm is at least 200gf higher than that of the non-thickened region.
Preferably, the puncture strength of the thickened region of the separator is greater than 500gf.
The multi-lug battery cell comprises a positive plate, a negative plate and the diaphragm, wherein the diaphragm is arranged between the positive plate and the negative plate, and the positive plate, the diaphragm and the negative plate are assembled into the multi-lug battery cell in a winding mode or a lamination mode.
Preferably, the preparation process of the pole piece is finished by coating, rolling, slitting and laser foil cutting the pole lug on the positive pole piece or the negative pole piece of the multi-pole lug battery core.
Preferably, the preparation process of the pole piece is finished by the positive pole piece or the negative pole piece of the multi-pole ear battery cell in a die cutting mode.
A lithium ion battery comprises the multi-lug battery core.
The beneficial effects of the utility model are as follows:
the separator can not only avoid short circuit risks caused by the fact that burrs at the edges of the foil lugs penetrate through the separator, but also prevent the influences on the safety and electrical performance of the battery caused by poor alignment of positive and negative poles; the positions of the diaphragms corresponding to the positive electrode and the negative electrode foil electrode lugs of the multipolar lug battery core are high-strength, high-hardness and large-thickness positions, so that the risk of short circuit caused by the fact that burrs at the edges of the foil electrode lugs penetrate through the diaphragms can be avoided; in addition, the diaphragm at the edge of the top foil tab is thickened, so that the air permeability of a thickened area at the top of the diaphragm can be reduced, the lithium ion transmission speed is reduced under the condition of high current density, the problem of lithium precipitation in the edge area of the negative electrode plate in the circulation process is solved, the thickness of the top of the battery can be compensated, the interface of the formed top is well adhered, and the safety performance of the battery is further improved.
Drawings
FIG. 1 is a schematic view of a separator according to the present utility model;
FIG. 2 is a schematic cross-sectional view of a diaphragm according to the present utility model;
FIG. 3 is a schematic structural view of a positive plate of the multi-lug battery cell winding structure of the utility model;
FIG. 4 is a schematic structural view of a positive plate of the multi-lug cell lamination structure of the utility model;
fig. 5 is a schematic structural diagram of the multi-tab cell of the present utility model.
In the figure: a 001 functional coating; 002 septum body; 003 a first positive plate;
004 a first positive foil tab; 005 a second positive plate;
006 a second positive foil tab; 007 negative electrode foil tab
Detailed Description
To further illustrate the utility model, the following examples are provided in connection with:
example 1
1-2, the membrane has different thickness in the width direction, and comprises a membrane main body 002, wherein the membrane main body is also coated and fixed with a functional coating 001, the functional coating is a ceramic insulating layer and a glue coating layer, and is used for increasing the thickness and strength of the membrane in the width direction, wherein the insulating material adopted by the ceramic insulating layer is boehmite (can also be A l) 2 O 3 、A l OOH、SiO 2 、T iO 2 、ZrO 2 、SnO 2 、MgO、ZnO、CaO、CeO 2 、Y 2 O 3 、BaT i O 3 、SrT iO 3 One or any combination of polybutenes and polyethylene adhesives), the thickness of the functional coating is about 20um (the thickness of the ceramic insulating layer and the thickness of the rubberized layer are 10um respectively), and the puncture strength of the thickened area of the diaphragm is about 600gf. The functional coating is fixed at the edge of the diaphragm body by double-sided coating and corresponds to the positions of the positive foil tab and the negative foil tab when the multi-tab battery cell is assembled, so that burrs of the foil tab correspond to high thickness, high hardness and high strengthAnd the diaphragm area is measured, so that the safety performance of the multi-pole ear cell is improved.
Example 2
As shown in fig. 3 and 5, the multi-electrode ear battery cell comprises a first positive electrode piece 003, a negative electrode piece and a diaphragm according to embodiment 1, wherein the diaphragm is arranged between the first positive electrode piece and the negative electrode piece, the first positive electrode piece, the diaphragm and the negative electrode piece are assembled into the multi-electrode ear structure battery cell in a winding manner, the first positive electrode piece or the negative electrode piece of the winding structure is coated, rolled, cut and laser foil tab cutting to complete the preparation process of the electrode piece, and the functional coating on the edge of the diaphragm main body of the diaphragm corresponds to the positions of the first positive electrode foil tab 004 and the negative electrode foil tab 007 when the multi-electrode ear structure battery cell is assembled.
Example 3
As shown in fig. 4 and 5, the multi-electrode ear cell includes a second positive electrode piece 005, a negative electrode piece and the diaphragm according to embodiment 1, the diaphragm is disposed between the second positive electrode piece and the negative electrode piece, the second positive electrode piece, the diaphragm and the negative electrode piece are assembled into the multi-electrode ear cell in a lamination manner, the second positive electrode piece or the negative electrode piece of the lamination structure completes the pole piece preparation process in a die cutting manner, and the functional coating on the edge of the diaphragm main body of the diaphragm corresponds to the positions of the second positive electrode foil tab 006 and the negative electrode foil tab 007 when the multi-electrode ear cell is assembled.
The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the design of the present utility model.
Claims (10)
1. A diaphragm, characterized in that: the thickness of the membrane body is different in the width direction, the membrane body is further coated and fixed with a functional coating, and the functional coating is a ceramic insulating layer and/or a glue coating layer and is used for increasing the thickness or strength of the membrane in the width direction.
2. A diaphragm according to claim 1, characterized in that: the coating fixing position of the functional coating is the edge of the diaphragm main body.
3. A diaphragm according to claim 1 or 2, characterized in that: the positions of the functional coatings correspond to the positions of the positive electrode foil lugs and the negative electrode foil lugs when the multi-lug battery cell is assembled.
4. A diaphragm according to claim 1 or 2, characterized in that: the insulating material adopted by the ceramic insulating layer is Al 2 O 3 、AlOOH、SiO 2 、TiO 2 、ZrO 2 、SnO 2 、MgO、ZnO、CaO、CeO 2 、Y 2 O 3 、BaTiO 3 、SrTiO 3 Boehmite, polybutene or polyethylene based adhesives.
5. A diaphragm according to claim 1, characterized in that: the thickness t1 of the functional coating is 1-20um.
6. A diaphragm according to claim 1, characterized in that: the width d1= (D1-D2)/2+a of the coating area of the functional coating, wherein D1 is the whole width of the diaphragm, D2 is the width of the positive plate, and a is in the range of 0-10mm.
7. A diaphragm according to claim 1, characterized in that: the puncture strength of the thickened region of the diaphragm is at least 200gf higher than the non-thickened region.
8. A diaphragm according to claim 1 or 7, characterized in that: the puncture strength of the thickened region of the diaphragm is greater than 500gf.
9. The utility model provides a multipolar ear electric core which characterized in that: the battery cell comprises a positive plate, a negative plate and the diaphragm according to one of claims 1-8, wherein the diaphragm is arranged between the positive plate and the negative plate, and the positive plate, the diaphragm and the negative plate are assembled into a multi-lug structure battery cell in a winding mode or a lamination mode.
10. A lithium ion battery, characterized in that: comprising the multipolar ear cell of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322130050.9U CN220585432U (en) | 2023-08-09 | 2023-08-09 | Diaphragm, multipolar ear cell and lithium ion battery thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322130050.9U CN220585432U (en) | 2023-08-09 | 2023-08-09 | Diaphragm, multipolar ear cell and lithium ion battery thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220585432U true CN220585432U (en) | 2024-03-12 |
Family
ID=90108692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322130050.9U Active CN220585432U (en) | 2023-08-09 | 2023-08-09 | Diaphragm, multipolar ear cell and lithium ion battery thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220585432U (en) |
-
2023
- 2023-08-09 CN CN202322130050.9U patent/CN220585432U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |