CN220456585U - Explosion-proof valve protection film, battery core shell and battery - Google Patents
Explosion-proof valve protection film, battery core shell and battery Download PDFInfo
- Publication number
- CN220456585U CN220456585U CN202322053540.3U CN202322053540U CN220456585U CN 220456585 U CN220456585 U CN 220456585U CN 202322053540 U CN202322053540 U CN 202322053540U CN 220456585 U CN220456585 U CN 220456585U
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- China
- Prior art keywords
- explosion
- proof valve
- slit
- protection film
- battery
- 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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- 239000011258 core-shell material Substances 0.000 title abstract description 4
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 239000012790 adhesive layer Substances 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 14
- 238000009423 ventilation Methods 0.000 claims abstract description 11
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 16
- 230000001070 adhesive effect Effects 0.000 abstract description 11
- 239000000853 adhesive Substances 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 239000012528 membrane Substances 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract description 2
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 101700004678 SLIT3 Proteins 0.000 description 17
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 17
- 239000003792 electrolyte Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 238000004880 explosion Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping 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
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model relates to the technical field of power batteries, in particular to an explosion-proof valve protection film, a battery core shell and a battery. Aiming at the technical problems that in the prior art, a slit is arranged in the center of an explosion-proof membrane of an explosion-proof valve, an adhesive layer is coated on the whole surface of a matrix, after a battery is subjected to vacuum baking test, the protective membrane is deformed, acid corrosion is caused by liquid infiltration, and residual adhesive is left on the explosion-proof valve, the utility model provides the explosion-proof valve protective membrane, which comprises the matrix and the adhesive layer on the periphery of the matrix; one side of the base body is provided with a slit which penetrates through the base body along the thickness direction; the adhesive layer extends from the periphery of the substrate to the slit and covers the slit; the glue layer is provided with a ventilation structure which is communicated with the slit. The slit is not easy to deform and fail, so that the air among the protective film, the explosion-proof valve and the top cover sheet is released, liquid drops can not leak into the explosion-proof valve, corrosion is avoided, and residual glue can not be left. The utility model also provides a battery cell shell and a battery using the explosion-proof valve protection film, so that the safety of the power battery is improved.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to an explosion-proof valve protection film, a battery core shell and a battery thereof.
Background
With the development of economic technology, new energy automobiles have become an emerging industry which is very attractive in the automobile industry. However, the problem of battery explosion protection of new energy vehicles is still a pain spot which plagues the industry. In order to ensure the safety of the power battery, the power battery is generally provided with an explosion-proof valve (Battery Explosion Proof Valve) on a top cover, which is a safety device for protecting the battery in case of emergency, and when the battery is over-pressurized or over-high in temperature, the valve is automatically opened to directly disperse the internal high-pressure gas, thereby achieving the purpose of explosion prevention. In order to prevent sharp objects from damaging the explosion-proof valve or foreign matters, dust and the like from falling into the explosion-proof valve to influence the appearance of the battery, a protective film is arranged on the upper surface of the explosion-proof valve, and the protective film is waterproof and breathable. A sealing space with air is formed among the explosion-proof valve, the protective film and the top cover sheet. When the battery is subjected to vacuum baking test, air among the three cannot be pumped away by a vacuum machine, so that the internal air pressure formed among the three is larger than the external air pressure, and the protective film is wrinkled and deformed and even fails after thermal expansion and cold contraction; thereby affecting the performance of the protective film and the appearance of the battery.
The Chinese utility model authority bulletin number is CN206564278U, the application date is 14 days of 2017 02 month, and the utility model name is: an explosion-proof valve protection film; the scheme of disclosure includes explosion-proof valve and protection film, and the explosion-proof valve sets up in the top cover piece, and the protection film pastes and covers in the top cover piece and cover the explosion-proof valve, and the protection film is provided with the ventilative gap of lyophobia. According to the scheme, the lyophobic and breathable gaps are formed in the protective film, so that air among the protective film, the explosion-proof valve and the top cover sheet is released, the internal and external air pressures of the protective film are consistent, and therefore the protective film is prevented from wrinkling and deforming or even failing in a vacuum baking test. Although the electrolyte droplets are generally in the shape of a round bead due to the large volume and the surface tension, the electrolyte droplets generally cannot leak into the explosion-proof valve through the gaps, the gaps can still be broken through due to pressure deformation after vacuum baking test, and the electrolyte droplets leak into the explosion-proof valve to cause corrosion.
The Chinese utility model authority bulletin number is CN213278313U, the application date is 2020, 09 and 01, and the utility model name is: an explosion-proof valve protection film for preventing electrolyte pollution of a power cell; the scheme of disclosure includes protection film body and adhesive linkage, and the periphery of protection film body is located to the adhesive linkage ring, and the protection film body passes through the adhesive linkage and links to each other and covers explosion-proof valve with the top cap, is equipped with the boss on the protection film body, and the boss is towards keeping away from the outstanding one side of explosion-proof valve, and one side of keeping away from annotating the liquid hole on the boss is equipped with the bleeder vent. The protection film of this scheme both can avoid battery electrolyte to soak into explosion-proof valve when annotating the liquid, has overcome simultaneously that the protection film's inside and outside pressure differential problem when high temperature toasts and helium examine the pumping process in electric core manufacturing process, prevents that the protection film warp and glue and drop, and the bleeder vent is kept away from annotating the liquid hole setting, can avoid electrolyte entering bleeder vent in. But suffer from the following disadvantages: the manufacturing is complex, the process time is increased, and the cost is increased; in addition, the design of the boss is unstable and has weak impact resistance.
Disclosure of Invention
1. Problems to be solved
Aiming at the technical problems that in the prior art, a slit is arranged in the center of an explosion-proof membrane of an explosion-proof valve, an adhesive layer is coated on the whole surface of a substrate, after a vacuum baking test is carried out on a battery, the explosion-proof valve protection membrane is deformed, liquid enters the explosion-proof valve to cause acid corrosion, and residual adhesive is left on the explosion-proof valve, the utility model provides the explosion-proof valve protection membrane, the slit is not easy to deform and fail, the air among the protection membrane, the explosion-proof valve and a top cover sheet is released, the internal and external air pressure of the air are consistent, electrolyte liquid drops can not leak into the explosion-proof valve through the slit, corrosion is avoided, and the residual adhesive can not be left to influence the appearance. The utility model also provides a battery cell shell and a battery using the explosion-proof valve protection film, so that the safety of the power battery is improved.
2. Technical proposal
In order to solve the problems, the technical scheme provided by the utility model is as follows:
the explosion-proof valve protection film comprises a matrix and a glue layer coated on the periphery of the matrix; a slit penetrating through the substrate in the thickness direction is formed in one side of the substrate; the adhesive layer extends to the slit from the periphery of the substrate and covers the slit; and the adhesive layer is provided with a ventilation structure, and the ventilation structure is communicated with the slit.
Further, the substrate is elliptical; the slit is disposed on the long axis.
Further, the glue layer is grid-shaped.
Further, the adhesive layer extends from the periphery of the substrate to the slit to form an extension area; the extension area is semicircular, fan-shaped or square.
Further, the slit is in any one of a cross shape, a straight shape, an H shape or a T shape.
Further, the size of the slit is 0.1-5 mm.
Further, the material of the substrate is PET, PP, PE or PI.
Further, release paper is arranged on one side of the adhesive layer, which is far away from the substrate.
And the battery cell shell is provided with the explosion-proof valve protection film.
And the battery uses the battery cell shell.
3. Advantageous effects
Compared with the prior art, the utility model has the beneficial effects that:
(1) The explosion-proof valve protection film comprises a substrate and a glue layer coated on the periphery of the substrate; one side of the base body is provided with a slit which penetrates through the base body along the thickness direction; the adhesive layer extends from the periphery of the substrate to the slit and covers the slit; the glue layer is provided with a ventilation structure which is communicated with the slit. The slit is not easy to deform and fail, so that the air among the protective film, the explosion-proof valve and the top cover sheet is released, liquid drops can not leak into the explosion-proof valve, corrosion is avoided, and residual glue can not be left.
(2) The explosion-proof valve protection film is used for the battery cell shell and the battery. The protective film is not easy to wrinkle, deform or even fall off, and electrolyte cannot flow into the explosion-proof valve hole, so that the service life and the safety of the battery are facilitated. Easy to assemble and process.
Drawings
FIG. 1 is a schematic top view of the protection film of the explosion-proof valve in example 1;
FIG. 2 is a schematic view of the explosion-proof valve protection film of example 1;
fig. 3 is a schematic perspective view of the protection film of the explosion-proof valve in example 1;
FIG. 4 is a schematic top view of a first embodiment of the explosion protection valve protection film of example 2;
fig. 5 is a schematic top view of a second embodiment of the explosion protection valve protection film of example 2.
In the figure:
1. a base; 2. a glue layer; 3. a slit; 4. an extension region.
Detailed Description
The utility model is further described below in connection with specific embodiments.
The following description of the embodiments of the present utility model will be made clearly and completely, and it is apparent that the described embodiments 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
The explosion-proof valve protection film of the embodiment, as shown in fig. 1-3, comprises a substrate 1 and a glue layer 2 coated on the periphery of the substrate 1.
The material of the substrate 1 may be PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene) or PI (polyimide), and in this embodiment, the substrate 1 is PET, which is a blue transparent film with a thickness of 0.2mm in appearance, and in other embodiments, a thickness of 0.15-0.25 mm can achieve good technical effects. The material of the base body 1 needs to be flat, smooth, free of burrs, free of material shortage and free of deformation, so that the obtained explosion-proof valve protection film can be ensured to be free of liquid leakage. Meanwhile, the outer surface of the protection film of the explosion-proof valve must be kept clean and free of dirt.
The thickness of the adhesive layer 2 is 0.15mm, and in practice, the thickness of 0.05-0.2 mm can achieve good technical effects. In this embodiment, the material of the adhesive layer 2 is 3M467,3M467, which is a base material-free double-sided adhesive of 3M double-sided adhesive, and is directly coated with acrylic acid adhesive, and the adhesive tape is transparent, belongs to a 3M200MP series adhesive system, has a thinner thickness, still has an excellent adhesive effect, can prevent falling off, has excellent waterproof performance, and has good processability, good temperature resistance and good holding power.
The slit 3 penetrating the substrate 1 in the thickness direction is arranged on one side of the substrate 1, the slit 3 in this embodiment is in a cross shape, in other embodiments, the slit 3 may be any one of a "one" shape, a "H" shape or a "T" shape, the lengths of two straight lines of the slit 3 in the cross shape are both 2mm, and in other embodiments, the size of the slit 3 may be 0.1-5 mm. The adhesive layer 2 extends from the periphery of the substrate 1 to the slit 3 and covers the slit 3, and the adhesive layer 2 extends from the periphery of the substrate 1 to the slit 3 to form an extension area 4. In this embodiment, the extension area 4 is semicircular, and in other embodiments, the slit 3 may be fan-shaped or square, as shown in fig. 4 or 5. The base 1 of this embodiment is elliptical, and the slit 3 is provided on one side of the major axis of the ellipse. In practice, the cross-shaped slit 3 is located between the glue layer 2 and the center point of the oval substrate 1, as close to one side of the glue layer 2 as possible. Compared with the slit 3 in the prior art, which is formed in the center of the protection film of the explosion-proof valve, the slit 3 formed in the embodiment has smaller stress and is less prone to falling off the protection film of the explosion-proof valve when gas is flushed out.
The glue layer 2 of this embodiment is provided with a ventilation structure, the glue layer 2 is a grid type, the ventilation structure is a gap between grids, and the ventilation structure is communicated with the slit 3. Through the mutual matching of the slit 3 and the ventilation structure, the exhaust effect can be achieved, and the penetration of external liquid can be well blocked.
In this embodiment, a release paper is further disposed on one side of the adhesive layer 2 away from the substrate 1. The release paper of the embodiment is waterproof kraft paper with a polymer coating, and cannot be wrinkled in a high-humidity environment; the heat resistance is good, the long-term heat resistance can be realized, and the short-term heat resistance can be realized.
The explosion-proof valve protection film prepared by the embodiment can well prevent sharp objects from damaging the explosion-proof valve or foreign matters, dust and the like from falling into the explosion-proof valve to influence the appearance of the battery, and is waterproof and breathable. A sealing space with air is formed among the explosion-proof valve, the explosion-proof valve protection film and the top cover sheet. When the battery is subjected to vacuum baking test, air among the three can pass through the ventilation structure and is pumped away by the vacuum machine through the cross-shaped slit 3, so that the internal air pressure formed among the three is not larger than the external air pressure, the protective film cannot be wrinkled and deformed after thermal expansion and cold contraction, the protective film of the explosion-proof valve cannot fail, and residual glue cannot be remained at the explosion-proof valve. The technical effect that the PET substrate 1 is punched out and the adhesive layer 2 is not punched out is achieved.
The explosion-proof valve protection film prepared by the embodiment has the advantages that the colloid high-temperature resistance at 85 ℃ is not reduced, the electrolyte corrosion resistance is not degummed at 45 ℃ for 72 hours.
The explosion-proof valve protection film of the embodiment can be applied to a battery cell shell and a battery. In the embodiment, the explosion-proof valve is a waist-shaped sheet body; the explosion-proof valve is provided with a welding part, so that the explosion-proof valve is convenient to weld on the battery cell shell. The battery prepared by the embodiment is easy to assemble and process.
Example 2
The explosion-proof valve protection film of this embodiment is basically the same as embodiment 1, except that:
the extension area 4 is in the embodiment of a sector or square. Compared with the semicircular extension area 4, the fan-shaped extension area 4 narrows the joint of the extension area 4 and the peripheral glue layer 2 body, when the gas impact force is large, the glue layer 2 body and the extension area 4 are disconnected, so that the glue peripheral part is still tightly attached to the base body 1, the explosion-proof valve protection film is not easy to wrinkle, deform or even fall off, the explosion-proof valve protection film cannot be tilted like the explosion-proof valve protection film in the prior art, and electrolyte cannot flow into the explosion-proof valve hole, thereby being beneficial to the service life and safety of the battery.
And when the extension area 4 is square, the processing technology is simpler and more efficient, and the production time is saved.
The base 1 of this embodiment is elliptical, and the slit 3 is provided on one side of the minor axis of the ellipse.
The explosion-proof valve protection film prepared by the embodiment also achieves the technical effects that the PET substrate 1 is punched out, and the adhesive layer 2 is not punched out. The colloid has high temperature resistance of 85 ℃ and no decrease in viscosity, electrolyte corrosion resistance and no degumming after 72 hours at 45 ℃.
Claims (10)
1. Explosion-proof valve protection film, its characterized in that: comprises a matrix (1) and a glue layer (2) coated on the periphery of the matrix (1); a slit (3) penetrating through the substrate (1) in the thickness direction is arranged on one side of the substrate (1); the adhesive layer (2) extends from the periphery of the substrate (1) to the slit (3) and covers the slit (3); and the adhesive layer (2) is provided with a ventilation structure, and the ventilation structure is communicated with the slit (3).
2. The explosion-proof valve protection film according to claim 1, wherein: the substrate (1) is elliptical; the slit (3) is arranged on one side of the long axis.
3. The explosion-proof valve protection film according to claim 2, wherein: the adhesive layer (2) is in a grid shape.
4. The explosion-proof valve protection film according to claim 2, wherein: the adhesive layer (2) extends from the periphery of the substrate (1) to the slit (3) to form an extension area (4); the extension area (4) is semicircular, fan-shaped or square.
5. The explosion-proof valve protection film according to claim 2, wherein: the slit (3) is in any one of a cross shape, a straight shape, an H shape or a T shape.
6. The explosion-proof valve protection film according to claim 2, wherein: the size of the slit (3) is 0.1-5 mm.
7. The explosion-proof valve protection film according to any one of claims 1 to 6, wherein: the material of the substrate (1) is PET, PP, PE or PI.
8. The explosion-proof valve protection film according to claim 7, wherein: and release paper is further arranged on one side of the adhesive layer (2) away from the base body (1).
9. Electric core casing, its characterized in that: use of an explosion-proof valve protection film according to any one of claims 1 to 8.
10. A battery, characterized in that: use of the cell housing of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322053540.3U CN220456585U (en) | 2023-07-31 | 2023-07-31 | Explosion-proof valve protection film, battery core shell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322053540.3U CN220456585U (en) | 2023-07-31 | 2023-07-31 | Explosion-proof valve protection film, battery core shell and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220456585U true CN220456585U (en) | 2024-02-06 |
Family
ID=89739175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322053540.3U Active CN220456585U (en) | 2023-07-31 | 2023-07-31 | Explosion-proof valve protection film, battery core shell and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220456585U (en) |
-
2023
- 2023-07-31 CN CN202322053540.3U patent/CN220456585U/en active Active
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