CN218975709U - Explosion-proof valve and battery - Google Patents
Explosion-proof valve and battery Download PDFInfo
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- CN218975709U CN218975709U CN202223438305.XU CN202223438305U CN218975709U CN 218975709 U CN218975709 U CN 218975709U CN 202223438305 U CN202223438305 U CN 202223438305U CN 218975709 U CN218975709 U CN 218975709U
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- explosion
- proof valve
- valve body
- protective layer
- battery
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- 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
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Abstract
The application relates to the technical field of batteries, in particular to an explosion-proof valve and a battery. The explosion-proof valve comprises an explosion-proof valve body, a first protection layer and a second protection layer; the top surface of the explosion-proof valve body is provided with a notch, and the first protection layer is arranged on the top surface of the explosion-proof valve body and at least covers the notch; the second protective layer is arranged on the bottom surface of the explosion-proof valve body and covers the whole bottom surface of the explosion-proof valve body. The battery includes the explosion-proof valve. This explosion-proof valve and this battery can effectively avoid electrolyte or the produced hydrofluoric acid of electrolyte to corroding the destruction to the explosion-proof valve body through setting up first protective layer and second protective layer, ensures under the normal pressure release function of explosion-proof valve not influenced's the prerequisite, improves the reliability and the life of explosion-proof valve, and then improves the security of battery.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an explosion-proof valve and a battery.
Background
The explosion-proof valve is an important safety component of the power battery, when the battery is out of control, the nick on the explosion-proof valve explodes under the action of high pressure in the battery, so that the explosion-proof valve is opened to realize the internal air exhaust and pressure relief of the battery, and the risk of explosion of the battery is reduced.
At present, a PET (polyethylene terephthalate) film is usually attached to the top of the existing explosion-proof valve and is used as a protective layer to prevent electrolyte from penetrating, so that the explosion-proof valve is prevented from being corroded. However, there is no protection measure for the bottom surface of the explosion-proof valve, and hydrofluoric acid may be generated in the electrolyte, and under the influence of the hydrofluoric acid, the bottom surface of the explosion-proof valve and the inside of the explosion-proof valve are at risk of being corroded and damaged, and if corrosion occurs, the structure of the explosion-proof valve is damaged, and the safety performance of the battery is reduced.
Disclosure of Invention
The purpose of this application is to provide an explosion-proof valve and battery to solve the bottom surface of the explosion-proof valve that exists among the prior art and have not had the protection measure and lead to the explosion-proof valve to take place the technical problem that the corrosion initiated structural failure easily to a certain extent.
The application provides an explosion-proof valve, which comprises an explosion-proof valve body, a first protective layer and a second protective layer;
the top surface of the explosion-proof valve body is provided with a notch, and the first protection layer is arranged on the top surface of the explosion-proof valve body and at least covers the notch;
the second protection layer is arranged on the bottom surface of the explosion-proof valve body, and the second protection layer covers the whole bottom surface of the explosion-proof valve body.
In the above technical solution, further, the first protection layer is a PVDF-HEP film layer.
In any of the above embodiments, further, the thickness of the first protective layer is 0.15-0.2mm.
In any of the above technical solutions, further, the second protective layer is a PVDF film layer.
In any of the above technical solutions, further, the second protective layer is a PU film layer or a TPU film layer.
In any of the above technical solutions, further, the thickness of the second protective layer is 0.05-0.1mm.
In any of the above technical solutions, further, the explosion-proof valve further includes an annular boss;
the annular boss is arranged around the circumference of the top surface of the explosion-proof valve body;
and/or the nicks are positioned on the inner side of the annular boss.
In any of the above solutions, further, the first protection layer is located inside the annular boss;
and/or the first protective layer covers the top surface of the explosion-proof valve body entirely.
In any of the above technical solutions, further, the thickness of the explosion-proof valve body is 0.5-0.7mm.
The application also provides a battery, which comprises the explosion-proof valve according to any one of the technical schemes.
Compared with the prior art, the beneficial effects of this application are:
the explosion-proof valve that this application provided includes explosion-proof valve body, first protective layer and second protective layer. The top surface of explosion-proof valve body has seted up the nick, and first protective layer sets up in the top surface of explosion-proof valve body and covers the nick at least to can carry out anticorrosive and keep apart the protection to the nick of explosion-proof valve body through first protective layer, the second protective layer sets up in the bottom surface of explosion-proof valve body, and the second protective layer covers the whole of the bottom surface of explosion-proof valve body, thereby carries out anticorrosive and keep apart the protection to the bottom surface of explosion-proof valve body through the second protective layer.
And then this explosion-proof valve through setting up first protective layer and second protective layer can effectively avoid electrolyte or the produced hydrofluoric acid of electrolyte to corrode the destruction to the explosion-proof valve body, ensures under the normal pressure release function of explosion-proof valve not influenced's the prerequisite, improves the reliability and the life of explosion-proof valve, and then improves the security of battery.
The battery provided by the application comprises the explosion-proof valve, so that all beneficial effects of the explosion-proof valve can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first schematic structural view of an explosion-proof valve according to an embodiment of the present application;
fig. 2 is a second schematic structural diagram of the explosion-proof valve provided in the embodiment of the present application.
Reference numerals:
1-an explosion-proof valve; 10-a first protective layer; 11-an annular boss; 12-an explosion-proof valve body; 120-top surface; 121-a bottom surface; 13-a second protective layer; 14-scoring.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. 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.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1 and 2, an embodiment of the present application provides an explosion-proof valve 1 for venting pressure when thermal runaway of the battery occurs.
Referring to fig. 1 and 2, the present embodiment provides an explosion-proof valve 1; fig. 1 is an exploded view of an explosion-proof valve 1 provided in the present embodiment, which simply shows the structure of the explosion-proof valve 1; fig. 2 is a cross-sectional view of the explosion-proof valve 1 provided in the present embodiment.
The explosion-proof valve 1 provided in this embodiment includes an explosion-proof valve body 12, a first protection layer 10, and a second protection layer 13.
The explosion-proof valve body 12 is generally in a sheet shape, the material of the explosion-proof valve body 12 is aluminum or aluminum alloy, the explosion-proof valve body 12 is formed with a top surface 120 and a bottom surface 121, wherein the bottom surface 121 of the explosion-proof valve body 12 is used for facing the inside of the battery, and the top surface 120 of the explosion-proof valve body 12 is used for facing the outside of the battery.
The top surface 120 of the explosion-proof valve body 12 is provided with a notch 14, and the notch 14 is used for blasting in a thermal runaway state so as to realize the normal pressure relief function of the explosion-proof valve 1. The first protection layer 10 is disposed on the top surface 120 of the explosion-proof valve body 12 and at least covers the notch 14, so that when electrolyte is injected into the battery, if the electrolyte overflows or drops on the top surface 120 of the explosion-proof valve body 12, the notch 14 can be at least protected from corrosion by the first protection layer 10, and thus the notch 14 is prevented from being corroded by the electrolyte, and normal pressure relief of the notch 14 in a thermal runaway state is ensured.
The second protection layer 13 is disposed on the bottom surface 121 of the explosion-proof valve body 12, and the second protection layer 13 covers the entire bottom surface 121 of the explosion-proof valve body 12. Since the bottom surface 121 of the explosion-proof valve body 12 is used for facing the inside of the battery, the explosion-proof valve body 12 may be in contact with the electrolyte, and the bottom surface 121 of the explosion-proof valve body 12 is completely covered by the second protective layer 13, so that corrosion damage of the electrolyte itself or hydrofluoric acid generated after the electrolyte encounters air and water to the explosion-proof valve body 12 can be effectively avoided, the notch 14 and the explosion-proof valve body 12 can be effectively protected, the reliability of the explosion-proof valve 1 is improved, and the durability of the battery using the explosion-proof valve 1 is further improved.
It is understood that the first protective layer 10 and the second protective layer 13 are made of anti-corrosion materials, and specifically, the first protective layer 10 and the second protective layer 13 may be connected with the explosion-proof valve body 12 by spraying or bonding according to different raw materials.
In the alternative of the present embodiment, the thickness of the explosion-proof valve body 12 is 0.5-0.7mm, wherein by limiting the thickness of the explosion-proof valve body 12 to not less than 0.5mm is to ensure that the explosion-proof valve body 12 is sufficiently thick to obtain sufficient structural strength, and furthermore, by limiting the thickness of the explosion-proof valve body 12 to not more than 0.7mm, it is possible to avoid the explosion-proof valve body 12 from being excessively thick, affecting the pressure release performance thereof.
In an alternative of this embodiment, in order to improve the strength of the explosion-proof valve body 12 and facilitate welding the explosion-proof valve body 12 to the top cover plate of the battery, the explosion-proof valve 1 further includes an annular boss 11.
The annular boss 11 is disposed circumferentially around the top surface 120 of the explosion-proof valve body 12, in other words, the annular boss 11 is disposed at the top surface 120 of the explosion-proof valve body 12, and the annular boss 11 extends circumferentially along the explosion-proof valve body 12.
The score 14 is located inside the annular boss 11, in other words, the score 14 is provided at the top surface 120 of the explosion-proof valve body 12, and the score 14 is located in the space enclosed by the annular boss 11.
Therefore, the normal pressure release function of the notch 14 is not affected by the arrangement of the annular boss 11, and the structural strength of the explosion-proof valve body 12 can be improved, and in addition, the explosion-proof valve 1 can be more conveniently connected with the top cover plate by welding the annular boss 11 with the top cover plate of the battery.
In an alternative of the present embodiment, in order to more conveniently mold the first protective layer 10, the first protective layer 10 is disposed inside the annular boss 11, that is, in a space enclosed by the annular boss 11.
In addition, the first protection layer 10 is configured to entirely cover the top surface 120 of the explosion-proof valve body 12, and the difficulty in molding the first protection layer 10 can be significantly reduced compared to the case where the first protection layer 10 is configured to partially cover the top surface 120 of the explosion-proof valve body 12.
In an alternative of this embodiment, the first protection layer 10 is a PVDF-HEP (polyvinylidene fluoride-hexafluoropropylene) film layer, so that the PVDF-HEP film layer replaces the conventional PET fine sheet, and based on the hydrophobic air permeability of the PVDF-HEP film layer, the electrolyte is more reliably prevented from contacting and corroding the top surface 120 of the explosion-proof valve body 12.
Specifically, acetone or DMF (dimethylformamide) or the like is used as a solvent, and then, according to 1:10, magnetically stirring and dissolving PVDF solid particles and a solvent at a preset temperature to obtain PVDF-HEP slurry, rapidly scraping the slurry on the top surface 120 of the explosion-proof valve body 12 after preparing the slurry, then placing the explosion-proof valve body 12 into a vacuum oven, and vacuum drying for 5 minutes at 30 ℃, wherein PVDF has good adhesiveness on the explosion-proof valve body 12 made of metal, thus a compact and stable connection structure of the first protection layer 10 and the explosion-proof valve body 12 can be formed. Wherein, the predetermined temperature is normal temperature in the case of acetone as a solvent, and 70 ℃ in the case of DMF as a solvent.
In this embodiment, the thickness of the first protective layer 10 is 0.15-0.2mm, for example 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm or 0.2mm. Wherein, by limiting the thickness of the first protection layer 10 to not less than 0.15mm, it is possible to ensure that the first protection layer 10 has a sufficient thickness so that the corrosion preventing and isolating effect for the top surface 120 of the explosion-proof valve body 12 is sufficient. In addition, by limiting the thickness of the first protection layer 10 to not more than 0.2mm, it can be ensured that the first protection layer 10 is not excessively thick, on the one hand, it can be ensured that the first protection layer 10 can be tightly combined with the explosion-proof valve body 12, and on the other hand, the waste of raw materials of the first protection layer 10 is not caused, which is beneficial to saving the cost.
In an alternative of this embodiment, the second protection layer 13 is a PVDF (polyvinylidene fluoride) film layer, specifically, PVDF coating may be sprayed on the bottom surface 121 of the explosion-proof valve body 12 by using the electrostatic spraying principle and related processes, so as to obtain the second protection layer 13.
Or the second protective layer 13 is a PU (polyurethane) film layer or a TPU (polyurethane) film layer, specifically, DMF (dimethylformamide) or THF (tetrahydrofuran) is used as a solvent, solid particles of PU or TPU are stirred and dissolved to prepare a slurry, the slurry is smeared on the bottom surface 121 of the explosion-proof valve body 12, and vacuum drying is performed for 4 hours at the temperature of 70 ℃, so that the second protective layer 13 is obtained.
In this embodiment, the thickness of the second protective layer 13 is 0.05 to 0.1mm, for example, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, or the like. Wherein the thickness of the second protective layer 13 is not less than 0.05mm, it is possible to ensure that the second protective layer 13 has a sufficient thickness so that the corrosion preventing and isolating effects for the bottom surface 121 of the explosion-proof valve body 12 are sufficient. In addition, by limiting the thickness of the second protection layer 13 to not more than 0.1mm, it is possible to ensure that the second protection layer 13 is not excessively thick, on the one hand, it is possible to ensure that the second protection layer 13 can be tightly bonded with the explosion-proof valve body 12, and on the other hand, it is not possible to cause waste of raw materials of the second protection layer 13, which is advantageous in saving costs.
Example two
The second embodiment provides a battery, the embodiment includes the explosion-proof valve in the first embodiment, the technical features of the explosion-proof valve disclosed in the first embodiment are also applicable to the embodiment, and the technical features of the explosion-proof valve disclosed in the first embodiment are not repeated.
As shown in fig. 1 and fig. 2, the battery provided in this embodiment includes the explosion-proof valve, specifically, the explosion-proof valve covers the pressure release through hole of the top cover plate of the battery, and the explosion-proof valve body is welded with the top cover plate.
The battery in this embodiment has the advantages of the explosion-proof valve in the first embodiment, and the advantages of the explosion-proof valve disclosed in the first embodiment are not repeated here.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model. Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments. For example, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. The explosion-proof valve is characterized by comprising an explosion-proof valve body, a first protective layer and a second protective layer;
the top surface of the explosion-proof valve body is provided with a notch, and the first protection layer is arranged on the top surface of the explosion-proof valve body and at least covers the notch;
the second protection layer is arranged on the bottom surface of the explosion-proof valve body, and the second protection layer covers the whole bottom surface of the explosion-proof valve body.
2. The explosion protection valve of claim 1, wherein said first protective layer is a PVDF-HEP membrane layer.
3. The explosion protection valve according to claim 2, wherein the thickness of the first protective layer is 0.15-0.2mm.
4. The explosion protection valve of claim 1, wherein the second protective layer is a PVDF film.
5. The explosion protection valve of claim 1, wherein the second protective layer is a PU film layer or a TPU film layer.
6. The explosion-proof valve according to claim 4 or 5, wherein the thickness of the second protective layer is 0.05-0.1mm.
7. The explosion-proof valve of claim 1, further comprising an annular boss;
the annular boss is arranged around the circumference of the top surface of the explosion-proof valve body;
and/or the nicks are positioned on the inner side of the annular boss.
8. The explosion protection valve of claim 7, wherein said first protective layer is located inside said annular boss;
and/or the first protective layer covers the top surface of the explosion-proof valve body entirely.
9. The explosion proof valve of claim 1, wherein the explosion proof valve body has a thickness of 0.5-0.7mm.
10. A battery comprising an explosion-proof valve as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223438305.XU CN218975709U (en) | 2022-12-20 | 2022-12-20 | Explosion-proof valve and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223438305.XU CN218975709U (en) | 2022-12-20 | 2022-12-20 | Explosion-proof valve and battery |
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| Publication Number | Publication Date |
|---|---|
| CN218975709U true CN218975709U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223438305.XU Active CN218975709U (en) | 2022-12-20 | 2022-12-20 | Explosion-proof valve and battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116454524A (en) * | 2023-05-31 | 2023-07-18 | 三一红象电池有限公司 | Explosion-proof valve and preparation method and application thereof |
| CN117691297A (en) * | 2024-02-04 | 2024-03-12 | 蜂巢能源科技股份有限公司 | Explosion-proof valve and battery |
-
2022
- 2022-12-20 CN CN202223438305.XU patent/CN218975709U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116454524A (en) * | 2023-05-31 | 2023-07-18 | 三一红象电池有限公司 | Explosion-proof valve and preparation method and application thereof |
| CN116454524B (en) * | 2023-05-31 | 2024-05-24 | 三一红象电池有限公司 | Explosion-proof valve and preparation method and application thereof |
| CN117691297A (en) * | 2024-02-04 | 2024-03-12 | 蜂巢能源科技股份有限公司 | Explosion-proof valve and battery |
| CN117691297B (en) * | 2024-02-04 | 2024-04-19 | 蜂巢能源科技股份有限公司 | Explosion-proof valve of battery and battery |
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