CN109904354B - Battery case and battery for solving internal short circuit problem of battery by using insulating liquid - Google Patents
Battery case and battery for solving internal short circuit problem of battery by using insulating liquid Download PDFInfo
- Publication number
- CN109904354B CN109904354B CN201910151037.7A CN201910151037A CN109904354B CN 109904354 B CN109904354 B CN 109904354B CN 201910151037 A CN201910151037 A CN 201910151037A CN 109904354 B CN109904354 B CN 109904354B
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- Prior art keywords
- battery
- shell
- battery case
- insulating liquid
- short circuit
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- 239000007788 liquid Substances 0.000 title claims abstract description 33
- 239000003792 electrolyte Substances 0.000 claims abstract description 17
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 7
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000007306 turnover Effects 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
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The application provides a battery case and a battery for solving the problem of internal short circuit of the battery by using insulating liquid. The battery shell comprises a main shell body, at least part of the main shell body forms a double-layer structure, the double-layer structure comprises an outer shell and an inner shell, and insulating liquid is filled between the outer shell and the inner shell. And a safety part is formed on the inner shell and is used for damaging the battery after internal short circuit and flowing the insulating liquid into the main shell to increase the resistance of the electrolyte. By applying the technical scheme of the invention, when the battery shell is applied to a battery, if a short circuit occurs in the battery, the temperature is abnormally increased, so that the safety part is damaged, and the insulating liquid filled in the outer shell and the inner shell flows into the main shell. The insulating liquid is mixed into the electrolyte, so that the resistance of the electrolyte is rapidly increased, the short-circuit current is greatly reduced, the short-circuit heat release of the battery is reduced, the harm of the short circuit of the battery is reduced to the greatest extent, the influence caused by the internal short circuit of the battery is solved, and the occurrence of potential safety hazards is avoided.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery shell and a battery for solving the problem of internal short circuit of the battery by using insulating liquid.
Background
Aluminum-shell batteries are widely applied to energy storage and power battery markets, but safety is also widely concerned because most of the aluminum-shell batteries are high-capacity batteries.
In the industry, the external short circuit condition of the aluminum shell battery is mostly solved through an explosion-proof valve. For example, patent CN108735962a discloses an aluminum case cover plate, and the turnover piece of the aluminum case cover plate can timely fuse the tab to cut off external short circuit, so as to protect the battery. In addition, patent CN205303596U discloses an explosion-proof valve, which is installed at the bottom of the casing and at the top of the cover plate, and has a certain improvement effect on safety performance. Patent CN201156555Y also discloses a cover plate, and explosion-proof holes are arranged outside the cover plate, which can also play a role in improving the safety performance of the battery.
However, during actual use, the internal short circuit of the aluminum-case battery is more difficult to control and prevent than the external short circuit. The above-mentioned patent technology can only play the effect of breaking the external circuit, prevent the battery explosion, but can not further prevent the internal reaction of electric core, can't eradicate the huge harm that the internal reaction of electric core brought.
Disclosure of Invention
The embodiment of the invention provides a battery shell and a battery for solving the problem of internal short circuit of the battery by using insulating liquid, so as to solve the technical problem that the internal short circuit reaction of the battery cannot be solved in the prior art.
The embodiment of the application provides a battery case, including the main casing body, at least part of main casing body forms bilayer structure, bilayer structure includes outer shell and inlayer shell, and the filling has the insulating liquid between outer shell and the inlayer shell, is formed with the insurance portion on the inlayer shell, and the insurance portion is used for in the inside short circuit of battery after damaged with the resistance that increases electrolyte with the insulating liquid inflow main casing body.
In one embodiment, the insulating liquid is methyl silicone oil or solid paraffin.
In one embodiment, the inner shell is made of an inert insulating material.
In one embodiment, the inner shell is provided with an opening, and the safety part is a sealing film arranged on the opening.
In one embodiment, the main housing has a rectangular parallelepiped shape, and at least one surface of the main housing has a double-layer structure.
In one embodiment, the 4 sides of the main housing are each of a double-layered structure.
In one embodiment, the top surface of the main housing is provided with an explosion-proof valve and/or a liquid injection hole and/or a positive electrode and a negative electrode.
In one embodiment, the outer shell is provided with a connection table in a shape, and the inner shell is connected with the connection table.
In one embodiment, the connecting table is provided with a clamping groove, and the inner shell is clamped in the clamping groove.
The application also provides a battery, which comprises a battery shell, wherein the battery shell is the battery shell.
In the above embodiment, the battery case is applied to the battery, and if a short circuit occurs inside the battery, an abnormal temperature rise is caused, and thus the safety part is broken, allowing the insulating liquid filled in the outer and inner cases to flow into the main case. The insulating liquid is mixed into the electrolyte, so that the resistance of the electrolyte is rapidly increased, the short-circuit current is greatly reduced, the short-circuit heat release of the battery is reduced, the harm of the short circuit of the battery is reduced to the greatest extent, the influence caused by the internal short circuit of the battery is solved, and the occurrence of potential safety hazards is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic view of the overall structure of an embodiment of a battery case according to the present invention;
fig. 2 is a schematic structural view and an exploded schematic structural view of a side a of the battery case of fig. 1;
fig. 3 is a schematic structural view and an exploded schematic structural view of a side b of the battery case of fig. 1;
fig. 4 is a schematic view of the top surface and its attendant structure of the battery case of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
Fig. 1 and 2 illustrate an embodiment of a battery case for solving the problem of internal short circuit of a battery using an insulating liquid according to the present invention, the battery case including a main case 10, at least part of the main case 10 forming a double-layered structure including an outer case 11 and an inner case 12, and an insulating liquid being filled between the outer case 11 and the inner case 12. The inner case 12 is formed with a safety part 121, and the safety part 121 is used for breaking after the internal short circuit of the battery, flowing the insulating liquid into the main case 10, and increasing the resistance of the electrolyte.
By applying the technical scheme of the invention, when the battery shell is applied to a battery, if a short circuit occurs in the battery, the temperature is abnormally increased, so that the safety part 121 is damaged, and the insulating liquid filled in the outer shell 11 and the inner shell 12 flows into the main shell 10. The insulating liquid is mixed into the electrolyte, so that the resistance of the electrolyte is rapidly increased, the short-circuit current is greatly reduced, the short-circuit heat release of the battery is reduced, the harm of the short circuit of the battery is reduced to the greatest extent, the influence caused by the internal short circuit of the battery is solved, and the occurrence of potential safety hazards is avoided.
Compared with the external short circuit blocking technology in the prior art, the technical scheme of the invention can more directly solve the problem of internal short circuit of the battery and avoid further deterioration caused by the internal short circuit of the battery.
As an alternative embodiment, the insulating liquid is methyl silicone oil. The methyl silicone oil has small vapor pressure, higher flash point and ignition point of about 300 ℃, excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, can be compatible with electrolyte, rapidly increases the resistance of the electrolyte and greatly reduces short-circuit current.
As another alternative embodiment, the insulating liquid can also be solid paraffin, the melting point of the solid paraffin is 45-65 ℃, the flash point is not more than 200 ℃, and the solid paraffin is also suitable for being used as the insulating liquid.
In the technical solution of the present embodiment, the outer case 11 of the battery case is an aluminum case, which is the same as a general aluminum case battery. Preferably, in the technical solution of the present embodiment, the inner shell 12 is made of an inert insulating material to enhance the insulating properties of the battery interior with respect to the main case 10. Alternatively, the inner shell 12 may be made of a PTFE sheet, which is a material that is well insulated, corrosion resistant, and non-contaminating to the electrolyte. In addition, the PTFE sheet is a tough material, and can relieve the problem of expansion of the charge and discharge volume of the battery.
As shown in fig. 2, the inner shell 12 is provided with an opening, and the safety portion 121 is a sealing film disposed on the opening. Optionally, the sealing film is a PTFE film, and the PTFE film has thermoplastic deformability at 115-145 ℃ and can also adapt to the normal temperature rise in the battery. When the short-circuit temperature increases in the battery, the PTFE membrane deforms and breaks, releasing the insulating liquid between the outer case 11 and the inner case 12. As an alternative, the PTFE membrane may be made of other inert insulating materials.
As an alternative embodiment, the main casing 10 has a rectangular parallelepiped shape, and at least one surface of the main casing 10 has a double-layer structure, so that the above-described function of solving the internal short circuit of the battery can be achieved. As a most preferred embodiment, the 4 sides of the main casing 10 are all of a double-layer structure, so that the function of solving the internal short circuit of the battery is better, and the inner casing 12 of the 4 sides is made of PTFE sheet, so that the problem of expansion of the charge and discharge volume of the battery can be solved to the greatest extent, and the problem of expansion of the charge and discharge volume of the battery by about 18% can be relieved. As shown in fig. 2, the side a of the main casing 10 is schematically shown in a structure and an exploded structure; as shown in fig. 3, the side b of the main casing 10 is schematically shown in a structure and an exploded structure.
As shown in fig. 4, in the technical solution of the embodiment, an explosion-proof valve 13, a liquid injection hole 14, a positive electrode 15, and a negative electrode 16 are provided on the top surface of the main casing 10. The explosion-proof valve 13 can solve the problem of external short circuit of the battery. By communicating the liquid injection hole 14 with the outer shell 11 and the inner shell 12, it is possible to facilitate filling of the insulating liquid therebetween.
As shown in fig. 2, in the technical solution of the present embodiment, a connection stand 111 is provided on an outer shell 11, an inner shell 12 is connected to the connection stand 111, and the inner shell 12 is connected to the outer shell 11 through the connection stand 111 at a distance. More preferably, in order to facilitate connection between the inner shell 12 and the connection platform 111, a clamping groove 112 is formed in the connection platform 111, and the inner shell 12 is clamped in the clamping groove 112. As another alternative embodiment, the outer shell 11, the connection table 111, and the inner shell 12 may be integrally formed shells. The adjacent two faces of the main housing 10 are sealed by laser welding.
When the embodiment is applied to the aluminum shell battery, after the aluminum shell battery is normally injected with liquid, the aluminum shell battery enters a formation and composition stage. If the positive and negative electrodes are in direct contact due to breakage of the separator, breakage of the pole piece, or external short circuit, etc., an internal short circuit occurs, the temperature increases, the separator contracts, the winding core deforms, and the winding core contacts the inner shell 12. The core continues to expand, and since the inner shell 12 is a ductile material, elastic deformation occurs to cushion the volume expansion of the core. When the internal temperature of the aluminum shell battery continues to rise and reaches 115 ℃, the PTFE film is shrunk and deformed, the sealing condition is destroyed, and the methyl silicone oil overflows into the electrolyte to be mixed with the electrolyte. Because the methyl silicone oil is high-insulation alkane liquid, the methyl silicone oil can be compatible with the electrolyte, so that the resistance value of the electrolyte is increased sharply, the short-circuit current is reduced sharply, heat generation is stopped, and the danger is relieved.
The invention also provides a battery, which comprises the battery shell, and the battery adopting the battery shell can solve the influence caused by internal short circuit of the battery and avoid the occurrence of potential safety hazards. It should be noted that the technical scheme of the battery is especially suitable for aluminum-shell batteries.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations can be made to the embodiments of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a battery case, includes main casing (10), its characterized in that, at least part of main casing (10) forms bilayer structure, bilayer structure includes outer shell (11) and inlayer shell (12), outer shell (11) with annotate between inlayer shell (12) has insulating liquid, be formed with safety portion (121) on inlayer shell (12), safety portion (121) are used for after battery internal short circuit because of the temperature rise damage will the insulating liquid flows in main casing (10) internal increase electrolyte's resistance.
2. The battery case according to claim 1, wherein the insulating liquid is methyl silicone oil or solid paraffin.
3. The battery case according to claim 1, wherein the inner case (12) is made of an inert insulating material.
4. The battery case according to claim 1, wherein the inner case (12) is provided with an opening, and the safety portion (121) is a sealing film provided on the opening.
5. The battery case according to claim 1, wherein the main case (10) has a rectangular parallelepiped shape, and at least one face of the main case (10) has a double-layer structure.
6. The battery case according to claim 5, wherein the 4 sides of the main case (10) are each of a double-layered structure.
7. Battery case according to claim 6, characterized in that the top surface of the main housing (10) is provided with an explosion-proof valve (13) and/or a liquid filling hole (14) and/or a positive electrode (15) and a negative electrode (16).
8. The battery case according to claim 5, wherein a connection stand (111) is provided on the outer case (11), and the inner case (12) is connected to the connection stand (111).
9. The battery case according to claim 8, wherein the connecting table (111) is provided with a clamping groove (112), and the inner case (12) is clamped in the clamping groove (112).
10. A battery comprising a battery case, characterized in that the battery case is the battery case according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910151037.7A CN109904354B (en) | 2019-02-28 | 2019-02-28 | Battery case and battery for solving internal short circuit problem of battery by using insulating liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910151037.7A CN109904354B (en) | 2019-02-28 | 2019-02-28 | Battery case and battery for solving internal short circuit problem of battery by using insulating liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109904354A CN109904354A (en) | 2019-06-18 |
| CN109904354B true CN109904354B (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910151037.7A Active CN109904354B (en) | 2019-02-28 | 2019-02-28 | Battery case and battery for solving internal short circuit problem of battery by using insulating liquid |
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| Country | Link |
|---|---|
| CN (1) | CN109904354B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447443A (en) * | 2022-02-11 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device, method for manufacturing electrochemical device, and electric device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5897255A (en) * | 1981-12-02 | 1983-06-09 | Fuji Elelctrochem Co Ltd | Manufacture of packing for dry battery |
| JP2005332630A (en) * | 2004-05-18 | 2005-12-02 | Matsushita Electric Ind Co Ltd | Alkaline dry battery |
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-
2019
- 2019-02-28 CN CN201910151037.7A patent/CN109904354B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5897255A (en) * | 1981-12-02 | 1983-06-09 | Fuji Elelctrochem Co Ltd | Manufacture of packing for dry battery |
| JP2005332630A (en) * | 2004-05-18 | 2005-12-02 | Matsushita Electric Ind Co Ltd | Alkaline dry battery |
| CN101453002A (en) * | 2007-11-29 | 2009-06-10 | 比亚迪股份有限公司 | Battery and method for preparing the same |
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| CN104953061A (en) * | 2015-05-29 | 2015-09-30 | 浙江西凯新能源开发有限公司 | Battery shell, making method thereof, and battery with battery shell |
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| Title |
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| CN109904354A (en) | 2019-06-18 |
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