CN219959363U - Explosion-proof device for battery shell - Google Patents
Explosion-proof device for battery shell Download PDFInfo
- Publication number
- CN219959363U CN219959363U CN202222568862.7U CN202222568862U CN219959363U CN 219959363 U CN219959363 U CN 219959363U CN 202222568862 U CN202222568862 U CN 202222568862U CN 219959363 U CN219959363 U CN 219959363U
- Authority
- CN
- China
- Prior art keywords
- explosion
- proof valve
- insulating film
- battery case
- proof
- 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.)
- Active
Links
- 230000001681 protective effect Effects 0.000 claims description 28
- 238000003475 lamination Methods 0.000 claims description 7
- 238000005336 cracking Methods 0.000 claims description 4
- 238000010329 laser etching Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000004734 Polyphenylene sulfide Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000010959 steel Substances 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
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses an explosion-proof device for a battery shell, which comprises the battery shell, wherein an explosion-proof valve is arranged on the battery shell, an insulating film is arranged on the outer side of the explosion-proof valve, a prefabricated rupture line is preset on the insulating film, the rupture pressure of the prefabricated rupture line is not larger than the opening pressure of the explosion-proof valve.
Description
Technical Field
The utility model relates to the technical field of battery shells, in particular to an explosion-proof device for a battery shell.
Background
The square shell power battery is widely applied in the field of new energy at present, and a large number of square shell structures are adopted in the NCM ternary or LFP iron lithium batteries. The casing of the square-casing cell is usually an aluminum alloy or steel structure, and a protective film is usually arranged on the surface of the square casing to ensure the insulativity of the square-casing cell.
On the other hand, in order to prevent explosion of the battery in case of failure of the unit cell such as a short circuit or thermal runaway, the square-case power battery is generally provided with an explosion-proof valve on the case or the cover plate. In order to ensure the normal opening of the explosion-proof valve, the protection film cannot cover the explosion-proof valve, and holes are arranged in the area of the protection film, which is covered with the explosion-proof valve. Because the explosion-proof valve is generally in an aluminum alloy structure, the exposed metal can not meet the insulation requirements such as creepage distance and the like in a battery pack system.
Disclosure of Invention
The utility model aims to provide an explosion-proof device for a battery shell, which is used for solving the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides a battery case explosion-proof equipment, includes the battery case, be equipped with the explosion-proof valve on the battery case, the explosion-proof valve outside is equipped with the insulating film, preset the prefabricated broken line on the insulating film, the cracking pressure of prefabricated broken line is not greater than the cracking pressure of explosion-proof valve.
As a further scheme of the utility model: the explosion-proof valve and the battery shell are integrally formed.
As a further scheme of the utility model: the battery shell is provided with an explosion-proof valve mounting hole, and an explosion-proof valve is arranged in the explosion-proof valve mounting hole.
As a further scheme of the utility model: the battery shell is externally wrapped with a protective film, the protective film is provided with a protective film through hole, the protective film through hole is positioned at the outer side of the explosion-proof valve mounting hole, and the explosion-proof valve mounting hole is positioned in the protective film through hole.
As a further scheme of the utility model: the insulating film is positioned on the inner side of the protective film, the outer edge of the insulating film is in pressure connection with the inner side of the protective film to form a laminated part, and the width of the laminated part is 1-10mm.
As a further scheme of the utility model: the insulating film is positioned outside the protective film, the outer edge of the insulating film is in pressure connection with the outer side of the protective film to form a laminated part, and the width of the laminated part is 1-10mm.
As a further scheme of the utility model: the thickness of the insulating film is not more than 0.1mm, and the thickness of the protective film is not more than 0.2mm.
As a further scheme of the utility model: the prefabricated rupture line is a groove formed on the insulating film by laser etching or stamping, and is cross-shaped or straight-shaped or I-shaped.
As a further scheme of the utility model: the explosion-proof valve mounting hole bottom plate is provided with a mounting boss, and the lower end of the explosion-proof valve is clamped on the mounting boss.
As a further scheme of the utility model: the protective film and the insulating film are made of PET, PPS, PP or PI.
Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the explosion-proof valve mounting hole is formed in the battery shell, the explosion-proof valve is mounted in the mounting hole, the insulating film is adhered to the outer side of the explosion-proof valve, and the insulating film is overlapped and arranged at a position where the insulating film contacts with the protective film wrapped outside the battery shell, so that the creepage distance requirement of the battery core in the explosion-proof valve area is met, meanwhile, the prefabricated rupture line is arranged on the insulating film, and under the premise of ensuring the strength of the insulating film, the explosion-proof valve can be normally opened under the condition that the internal pressure is increased due to thermal runaway of the prefabricated rupture line, and the insulating property and the safety requirement of the battery core are considered.
Drawings
FIG. 1 is a schematic view of a battery housing according to the present utility model;
FIG. 2 is a schematic view of the structure of an insulating film at the explosion-proof valve position of a battery case according to the present utility model;
FIG. 3 is a sectional view showing the position of an explosion-proof valve of a battery case according to embodiment 1 of the present utility model;
fig. 4 is a sectional view showing the explosion-proof valve position of the battery case according to embodiment 2 of the present utility model.
In the figure: 1-battery shell, 2-explosion-proof valve, 3-prefabricated rupture line, 4-protection film, 5-insulating film, 6-explosion-proof valve mounting hole, 7-lamination portion, 8-protection film through-hole, 9-installation boss.
Detailed Description
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. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1-3, in an embodiment of the utility model, an explosion-proof device for a battery case comprises a battery case 1 and a protection film 4 wrapped outside the battery case 1, wherein the protection film 4 is made of polyethylene terephthalate (PET), an explosion-proof valve mounting hole 6 is formed in the case 1, an explosion-proof valve 2 is mounted in the explosion-proof valve mounting hole 6, a mounting boss 9 is arranged on a bottom plate of the explosion-proof valve mounting hole 6, the lower end of the explosion-proof valve 2 is clamped on the mounting boss 9, the explosion-proof valve 2 and the battery case 1 are welded or the explosion-proof valve 2 and the battery case 1 adopt an integrated punching or laser etching structure, the explosion-proof valve 2 can be positioned due to the mounting step 9 arranged in the explosion-proof valve mounting hole, the welding connection area can be increased, the connection strength is improved, a protection film through hole 8 is formed in the protection film 4, the protection film through hole 8 is positioned outside the explosion-proof valve mounting hole 6, the explosion-proof valve mounting hole 6 is positioned in the protective film through hole 8, namely, the projection of the explosion-proof valve 2 on the battery shell 1 is completely positioned in the protective film through hole 8, the outer side of the explosion-proof valve 2 is provided with an insulating film 5, the insulating film 5 is made of PET material, the insulating film 5 is provided with a prefabricated rupture line 3 in advance, the rupture pressure of the prefabricated rupture line 3 is not more than the opening pressure of the explosion-proof valve 2, the prefabricated rupture line 3 is a groove formed on the insulating film 5 by laser etching or punching, the prefabricated rupture line 3 is in a cross shape or a straight shape or an I shape, in the embodiment, the prefabricated rupture line adopts a cross structure, the insulating film 5 is connected on the outer side of the explosion-proof valve 2 in a pasting mode, the insulating film 5 is positioned on the inner side of the protective film 4, the outer edge of the insulating film 5 is pressed on the inner side of the protective film 4 to form a laminated part 7, the width of the laminated part 7 is 1-10mm, in order to satisfy creepage distance's requirement, in addition, battery case 1, explosion-proof valve 2's outer terminal surface is on a plane, and the thickness of insulating film 5 is not more than 0.1mm, and the thickness of protection film 4 is not more than 0.2mm to guarantee that the one side flatness that the electricity core had the explosion-proof valve is not more than 0.3mm.
In the use process, if the inside of the battery is damaged, the pressure in the battery is increased severely, when the pressure in the battery is increased to exceed the opening threshold value of the explosion-proof valve 2, the explosion-proof valve 2 is opened, under the action of pressure, gas and gas impurities in the battery shell 1 can be discharged through the valve port of the explosion-proof valve 2, when the air flow is discharged out of the valve port and then can impact the insulating film 5 on the outer side of the explosion-proof valve 2, as the prefabricated rupture line 3 is arranged on the insulating film 5, the rupture pressure of the prefabricated rupture line 3 is smaller than the opening pressure of the explosion-proof valve 2, the insulating film 5 can be ruptured at the position of the prefabricated rupture line 3 under the impact of the air flow, and then the pressure air flow discharged out of the explosion-proof valve 2 can be smoothly discharged outside the battery, and the explosion of the battery caused by the overlarge pressure is avoided.
Example 2
Referring to fig. 1-2 and fig. 4, in this embodiment, an insulating film 5 is attached to the outside of an explosion-proof valve 2 by way of adhesion, the insulating film 5 is located outside a protecting film 4, the outer edge of the insulating film 5 is crimped outside the protecting film 4 to form a lamination portion 7, the width of the lamination portion 7 is 1-10mm, a prefabricated breaking line 3 on the insulating film 5 is i-shaped, the protecting film 4 is made of PET material, the insulating film 5 is made of PPS (polyphenylene sulfide) material, and the other structures and the using method are the same as those of embodiment 1.
Example 3
In this embodiment, the explosion-proof valve 2 and the battery case 1 are integrally formed, the protection film 4 is made of PP (polypropylene) material, the insulation film 5 is made of PI (polyimide) material, and the rest of the structure and the use process are the same as those of embodiment 1.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The utility model provides a battery case explosion-proof equipment, includes battery case (1), be equipped with explosion-proof valve (2) on battery case (1), its characterized in that, explosion-proof valve (2) outside is equipped with insulating film (5), preset prefabricated broken line (3) on insulating film (5), the cracking pressure of prefabricated broken line (3) is not greater than the cracking pressure of explosion-proof valve (2).
2. The battery case explosion-proof device according to claim 1, wherein the explosion-proof valve (2) is integrally formed with the battery case (1).
3. The battery shell explosion-proof device according to claim 1, wherein an explosion-proof valve mounting hole (6) is formed in the battery shell (1), and an explosion-proof valve (2) is mounted in the explosion-proof valve mounting hole (6).
4. A battery case explosion-proof device according to claim 3, wherein the battery case (1) is externally wrapped with a protective film (4), a protective film through hole (8) is provided on the protective film (4), the protective film through hole (8) is located at the outer side of the explosion-proof valve mounting hole (6), and the explosion-proof valve mounting hole (6) is located in the protective film through hole (8).
5. The explosion-proof device for a battery case according to claim 4, wherein the insulating film (5) is located inside the protective film (4), an outer edge of the insulating film (5) is crimped inside the protective film (4) to form a lamination portion (7), and a width of the lamination portion (7) is 1-10mm.
6. The explosion-proof device for a battery case according to claim 4, wherein the insulating film (5) is located outside the protective film (4), an outer edge of the insulating film (5) is crimped outside the protective film (4) to form a lamination portion (7), and a width of the lamination portion (7) is 1-10mm.
7. The explosion-proof device for battery case according to claim 4, wherein the thickness of the insulating film (5) is not more than 0.1mm, and the thickness of the protective film (4) is not more than 0.2mm.
8. The explosion-proof device for a battery case according to claim 1, wherein the prefabricated rupture line (3) is a groove formed on the insulating film (5) by laser etching or punching, and the prefabricated rupture line (3) is cross-shaped or in-line or i-shaped.
9. A battery case explosion-proof device according to claim 3, wherein the bottom plate of the explosion-proof valve mounting hole (6) is provided with a mounting boss (9), and the lower end of the explosion-proof valve (2) is clamped on the mounting boss (9).
10. The explosion-proof device for the battery case according to claim 4, wherein the protective film (4) and the insulating film (5) are made of PET, PPS, PP or PI.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222568862.7U CN219959363U (en) | 2022-09-27 | 2022-09-27 | Explosion-proof device for battery shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222568862.7U CN219959363U (en) | 2022-09-27 | 2022-09-27 | Explosion-proof device for battery shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219959363U true CN219959363U (en) | 2023-11-03 |
Family
ID=88551959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222568862.7U Active CN219959363U (en) | 2022-09-27 | 2022-09-27 | Explosion-proof device for battery shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219959363U (en) |
-
2022
- 2022-09-27 CN CN202222568862.7U patent/CN219959363U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |