CN111668424A - Power battery explosion-proof valve and power battery - Google Patents
Power battery explosion-proof valve and power battery Download PDFInfo
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- CN111668424A CN111668424A CN202010687784.5A CN202010687784A CN111668424A CN 111668424 A CN111668424 A CN 111668424A CN 202010687784 A CN202010687784 A CN 202010687784A CN 111668424 A CN111668424 A CN 111668424A
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- 238000007789 sealing Methods 0.000 claims abstract description 45
- 238000005192 partition Methods 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention discloses a power battery explosion-proof valve and a power battery, and belongs to the technical field of power batteries. The power battery explosion-proof valve comprises a cavity base, a top cover and a piston rod, wherein a through hole is formed in the through hole of the cavity base; the top cover is connected with the cavity base, an air chamber cavity with an opening at one end is arranged on the top cover, the opening of the air chamber cavity faces the through hole, and an air outlet communicated with the through hole is formed in the top cover; the piston rod is arranged in the through hole in a sliding sealing manner and can seal and obstruct the openings at the two ends of the through hole, and one end of the piston rod is arranged in the air chamber cavity in a sliding manner and is connected with the air chamber cavity in a sealing manner to form a first air chamber; the piston rod slides towards the top cover, so that the openings at the two ends of the through hole are communicated, and the piston rod slides away from the top cover, so that the openings at the two ends of the through hole are blocked. The power battery comprises the power battery explosion-proof valve. The power battery explosion-proof valve and the power battery have simple structures, and the power battery explosion-proof valve can be recycled, so that the manufacturing cost is reduced.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to an explosion-proof valve of a power battery and the power battery.
Background
When the power battery is used, high-temperature and high-pressure gas is generated inside the battery due to overcharge, overdischarge or short circuit and the like, and if the gas cannot be discharged in time, the battery can explode, even serious accidents are caused. In order to solve the problems, in the existing design, the square aluminum shell battery uses the aluminum sheet to increase the blasting grains, so that the square aluminum shell battery deforms under the action of certain pressure, and then cracks at the blasting grains to discharge gas, so that the purpose of preventing the battery from cracking violently due to overlarge internal pressure is achieved. On one hand, however, the used aluminum sheet is made of special materials, generally adopts imported materials and is expensive; secondly, the explosion-proof valve is disposable, and after explosion, air can enter the battery, so that higher risk exists; furthermore, it is not easy to adjust the cracking pressure, and the cracking pressure may vary due to high temperature factors during laser welding in production.
Disclosure of Invention
The invention aims to provide an explosion-proof valve for a power battery, which has a simple structure, reduces the manufacturing cost and improves the use safety.
In order to achieve the purpose, the invention adopts the following technical scheme:
an explosion-proof valve for a power battery, comprising:
the cavity base is provided with a through hole;
the top cover is connected with the cavity base, an air chamber cavity with an opening at one end is arranged on the top cover, the opening of the air chamber cavity faces the through hole, and an air outlet communicated with the through hole is formed in the top cover;
the piston rod is arranged in the through hole in a sliding sealing mode and can seal and obstruct openings at two ends of the through hole, and one end of the piston rod is arranged in the air chamber cavity in a sliding mode and is connected with the air chamber cavity in a sealing mode to form a first air chamber; the piston rod slides towards the top cover, so that the openings at the two ends of the through hole are communicated, and the piston rod slides away from the top cover, so that the openings at the two ends of the through hole are blocked.
Optionally, a first partition part is arranged on the through hole, a second partition part is arranged on the piston rod, the first partition part and the second partition part are matched to separate the through hole into a mounting cavity and a pressure relief cavity, the piston rod is connected in the mounting cavity in a sliding mode, and the pressure relief cavity is communicated with the exhaust port.
Optionally, the first partition is a step provided on the through hole, the second partition is a shoulder provided on the piston rod, the shoulder can abut against the step, and the shoulder moves in the pressure relief cavity.
Optionally, the opening pressure value of the explosion-proof valve of the power battery is A, the stroke of the piston rod is B, the height of the air chamber cavity is C, and the relationship is B-1- (1/C) ^ (㏒)2(A*10))。
Optionally, the height C of the air chamber cavity is 2 mm.
Optionally, the power battery explosion-proof valve further comprises a first sealing ring, and the first sealing ring is arranged between the piston rod and the air chamber cavity.
Optionally, the power battery explosion-proof valve further comprises a second sealing ring, the second sealing ring is arranged on the piston rod and is connected between the mounting cavity and the pressure relief cavity in a sealing mode.
Optionally, the exhaust port is an annular hole symmetrically disposed between the pressure relief cavity and the air chamber cavity.
Optionally, the top cover, the cavity base and the piston rod are all made of high-temperature-resistant materials.
Another object of the present invention is to provide a power battery, which has a simple structure, reduces the manufacturing cost, and improves the safety in use.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power battery comprises the power battery explosion-proof valve.
The invention has the beneficial effects that:
according to the power battery explosion-proof valve provided by the invention, initially, the pressure value in the first air chamber is atmospheric pressure; when the pressure in the battery is higher than the atmospheric pressure in the first air chamber, the explosion-proof valve of the power battery is opened along with the continuous rising of the air pressure in the battery, namely, the piston rod slides towards the top cover, the inside of the through hole is communicated, the gas in the battery enters the through hole through an opening at one end of the cavity base, which is far away from the top cover, and finally is discharged to the outside through the air outlet; the air pressure in the first air chamber rises along with the sliding of the piston rod towards the top cover, the pressure in the battery is reduced after the gas in the battery is discharged, and when the pressure in the battery is lower than the pressure in the first air chamber, the piston rod is pushed by the pressure in the first air chamber to slide towards the direction far away from the top cover until the piston rod blocks the through hole. The top cover, the piston rod and the cavity base are all made of common materials, the structure is simple and reliable, the safety of the battery is improved, the manufacturing cost is low, the period is short, in addition, the explosion-proof valve can be continuously sealed and recycled after pressure relief, and the using cost is further reduced.
According to the power battery provided by the invention, the manufacturing cost of the power battery is reduced and the use safety of the power battery is improved by adopting the power battery explosion-proof valve.
Drawings
Fig. 1 is an exploded view of an explosion-proof valve for a power battery according to an embodiment of the present invention;
fig. 2 is an axial sectional view of the explosion-proof valve for power battery according to the embodiment of the invention.
In the figure:
1-a canopy; 11-an exhaust port; 12-a gas chamber cavity;
2-a piston rod; 21-a boss portion; 22-shaft shoulder; 23-a body portion;
3-a cavity base; 31-a through hole; 311-a pressure relief cavity; 312-a mounting cavity; 313-step;
4-a first sealing ring;
5-second sealing ring.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The embodiment provides an explosion-proof valve for a power battery, as shown in fig. 1 and 2, comprising a cavity base 3, a top cover 1 and a piston rod 2, wherein the cavity base 3 is provided with a through hole 31; the canopy cover 1 is connected to the cavity base 3, specifically, can be connected to one end of the cavity base 3, the canopy cover 1 is provided with an air chamber cavity 12 with an opening at one end, the opening of the air chamber cavity 12 faces to the through hole 31 of the cavity base 3, and the canopy cover 1 is provided with an exhaust port 11 communicated with the through hole 31; the piston rod 2 is arranged in the through hole 31 in a sliding and sealing mode and can seal and obstruct openings at two ends of the through hole 31, and one end of the piston rod 2 is arranged in the air chamber cavity 12 in a sliding mode and is connected with the air chamber cavity 12 in a sealing mode to form a first air chamber; the piston rod 2 slides towards the top cover 1, so that the openings at the two ends of the through hole 31 are communicated, and the piston rod 2 slides away from the top cover 1, so that the openings at the two ends of the through hole 31 are blocked.
Alternatively, the piston rod 2 is slidably and sealingly disposed in the through hole 31 through a seal member, and the seal member can be at least partially separated from one of the through hole 31 and the piston rod 2 when the piston rod 2 slides relative to the through hole 31, so as to communicate the openings at both ends of the through hole 31. Alternatively, the seal can be at least partially separated from the through hole 32 to communicate the openings at both ends of the through hole 31 when the piston rod 2 slides relative to the through hole 31. Alternatively, the seal can be separated from the through hole 31 when the piston rod 2 slides relative to the through hole 31 to communicate the openings at both ends of the through hole 31. The sealing element is, for example, a second sealing ring 5. Optionally, a first partition is annularly and convexly arranged on the inner side wall of the through hole 31, and the piston rod 2 is slidably and hermetically arranged in the first partition; when the piston rod 2 slides towards the top cover 1 to compress the first air chamber, the sealing element can be separated from the first separating part so that the through hole 31 is far away from the opening of the exhaust port 11 and is communicated with the exhaust port 11; when the piston rod 2 slides away from the top lid 1 under the action of the compressed first air chamber, the piston rod 2 and the sealing element of the partition can be connected with the partition in a sealing manner again. Optionally, when the end of the piston rod 2 far from the air chamber cavity 12 is stressed to a force greater than a preset force, the piston rod 2 slides relative to the through hole 31 and compresses the first air chamber, and when the end of the piston rod 2 far from the air chamber cavity 12 is not stressed, the compressed first air chamber generates a restoring force on the piston rod 2 to push the piston rod 2 to move in a direction far from the first air chamber. In this process, 2 displacement in-process of piston rod, the sealing member makes the opening intercommunication or the sealed separation at the both ends of through-hole 31, and then the purpose of pressure release when reaching the intercommunication, makes the opening intercommunication pressure release at the both ends of through-hole 31 when specifically compressing first air chamber.
Initially, the pressure value in the first air chamber is atmospheric pressure; when the pressure in the battery is higher than the atmospheric pressure in the first air chamber, the explosion-proof valve of the power battery is opened along with the continuous rise of the air pressure in the battery, namely, the piston rod 2 slides towards the top cover 1, the inside of the through hole 31 is communicated, the gas in the battery enters the through hole 31 through the opening at the end, far away from the top cover 1, of the cavity base 3, and finally is exhausted to the outside through the air outlet 11; the air pressure in the first air chamber rises along with the sliding of the piston rod 2 towards the top lid 1, the pressure in the battery drops after the gas in the battery is discharged, and when the pressure in the battery is lower than the pressure in the first air chamber, the piston rod 2 is pushed by the pressure in the first air chamber to slide towards the direction far away from the top lid 1 until the piston rod 2 seals and blocks the through hole 31. The top cover 1, the piston rod 2 and the cavity base 3 are all made of common materials, the structure is simple and reliable, the safety of the battery is improved, the manufacturing cost is low, the period is short, in addition, the explosion-proof valve can be continuously sealed and recycled after pressure relief, and the using cost is further reduced. Optionally, the preset cracking pressure value is atmospheric pressure.
Optionally, a first partition part is arranged on the through hole 31, and a second partition part is arranged on the piston rod 2, and the first partition part and the second partition part cooperate to partition the through hole 31 into a mounting cavity 312 and a pressure relief cavity 311, wherein the first partition part and the second partition part may be in an abutting or interference fit connection or the like, along with the sliding of the piston rod 2, the sealing and blocking of the through hole 31 are realized through the close contact of the first partition part and the second partition part, and the two contact surfaces are separated to realize the communication of the through hole 31; specifically, the piston rod 2 is slidably connected in the mounting cavity 312, and the pressure relief cavity 311 is communicated with the exhaust port 11. In the present embodiment, the sealing member, for example, the illustrated second sealing ring 5, which is mainly connected to the through hole 31 in a sliding and sealing manner by the piston rod 2, is implemented for sealing and blocking, but the sealing member is not limited to the form of the sealing ring, and the cooperation between the first partition and the second partition mainly implements a limiting function on the piston rod 2 to prevent the piston rod 2 from sliding and falling off.
Further alternatively, the first partition is a step 313 arranged on the through hole 31, the second partition is a shaft shoulder 22 arranged on the piston rod, the shaft shoulder 22 can abut on the step 313, and a mounting cavity 312 and a pressure relief cavity 311 are formed by the cooperation of the shaft shoulder 22 and the step 313 in a partition manner; and the shaft shoulder part 22 moves in the pressure relief cavity 311, when the piston rod 2 is pushed by the pressure in the first air chamber to slide towards the direction far away from the top cover 1, the abutting fit of the shaft shoulder part 22 and the step 313 can play a role in limiting the piston rod 2, so that the resetting precision of the piston rod is improved, and the use consistency of the explosion-proof valve is improved.
Referring to fig. 1 and 2, in the present embodiment, the through hole 31 is a stepped hole, and the piston rod 2 includes: a boss portion 21, a shoulder portion 22 and a body portion 23, wherein the shoulder portion 22 is engaged with a step 313 of the stepped hole and can partition the through hole 31 into a mounting cavity 312 and a pressure relief cavity 311, and the pressure relief cavity 311 is communicated with the exhaust port 11; the boss part 21 is arranged at one end of the shaft shoulder part 22, and the boss part 21 is arranged in the air chamber cavity 12 in a sliding mode and is connected with the air chamber cavity 12 in a sealing mode; body portion 23 is disposed at the other end of shoulder 22, and body portion 23 is slidably disposed within mounting cavity 312. The boss part 21 and the air chamber cavity 12 form a first air chamber, the outer wall of the air chamber cavity 12, the periphery of the boss part 21, the shaft shoulder part 22 and the pressure relief cavity 311 form a second air chamber, and the shaft shoulder part 22, the mounting cavity 312 and the body part 23 form a third air chamber; through the change of the inner aperture of the mounting cavity 312 and the change of the shaft diameter of the piston rod 2, the release of the internal pressure of the battery by the three air chambers is realized, the structure is simple, and the use is convenient and reliable.
In this embodiment, the diameter of the boss portion 21, the diameter of the body portion 23, and the diameter of the shaft shoulder portion 22 are sequentially increased, the through hole 31 is a stepped hole, the inner diameter of the pressure relief cavity 311 is larger than the inner diameter of the mounting cavity 312, the shaft shoulder portion 22 can abut against the bottom wall of the pressure relief cavity 311, and the bottom wall can block the shaft shoulder portion 22, so that the piston rod 2 can block the mounting cavity 312 more reliably.
The burst pressure may vary depending on the use environment of the battery or other factors. The explosion-proof valve of blasting line on the aluminum sheet is adopted to the tradition, is difficult for adjusting the pressure value of opening to in production, the pressure value of opening can produce the change because of the high temperature factor when laser welding. In this embodiment, the opening pressure value of the explosion-proof valve of the power battery is a, the stroke of the piston rod 2 is B, the height of the air chamber cavity 12 is C, and the relationship is
B＝1-(1/C)^(㏒2(A*10))，
The opening pressure value, the stroke of the piston rod 2 and the height of the air chamber cavity 12 obtain a relational expression, and the stroke of the piston rod 2 and the height of the air chamber cavity 12 can be set according to different required opening pressure values, so that the opening pressure value can be adjusted conveniently. The opening pressure value is set to be atmospheric pressure usually, the stroke B of the piston rod 2 is set according to an experimental or empirical value so as to ensure that gas in the battery is discharged, the height C of the air chamber 12 can be obtained according to a relational expression, and the structural size of the explosion-proof valve is obtained by combining empirical summary and theoretical calculation, so that the structure is more accurate, and the use safety of the battery is improved.
In the embodiment, the end face of the top cover 1, which is far away from the cavity base 3, is provided with the bulge, the air chamber 12 is arranged on the bulge, and the size of the bulge can be designed according to the volume of the required first air chamber and the stroke B of the piston rod 2, so that the universality of the explosion-proof valve is stronger; in other embodiments, the end surface of the canopy 1 away from the cavity base 3 is a plane, and the air chamber 12 is disposed in the through hole 31 to reduce the volume of the canopy and release the assembly space; preferably, the end surface of the canopy 1 far from the cavity base 3 is a plane, the air chamber 12 is arranged in the through hole 31, and the height C of the air chamber 12 is 2 mm.
Optionally, the power battery explosion-proof valve further comprises a first sealing ring 4, and the first sealing ring 4 is arranged between the boss part 21 and the air chamber cavity 12 to increase the air tightness of the first air chamber, so that the explosion reliability of the explosion-proof valve is improved. Optionally, a first annular groove is formed in the outer side wall of the piston rod 2, and the first sealing ring 4 is installed in the first annular groove and abutted against the side wall of the air chamber cavity 12, so that the piston rod 2 and the air chamber cavity 12 are dynamically sealed through the first sealing ring 4.
Optionally, the power battery explosion-proof valve further comprises a second sealing ring 5, and the second sealing ring 5 is disposed between the body portion 23 and the mounting cavity 312 to increase the isolation between the pressure relief cavity 311 and the mounting cavity 312, i.e. the airtightness of the third air chamber, so as to prevent the leakage of the solution or gas inside the battery and improve the use safety of the battery. Optionally, a second annular groove is further formed in the outer side wall of the piston rod, and the second sealing ring 5 is installed in the second annular groove and abuts against the side wall of the through hole 31, so that the piston rod 2 and the through hole 31 are dynamically sealed through the second sealing ring 5.
Optionally, the exhaust port 11 is an annular hole symmetrically arranged between the pressure relief cavity 311 and the air chamber cavity 12, so that the area of the exhaust port 11 is increased, the exhaust amount is increased, and the use safety is further improved.
After the gas in the battery generates high pressure, high-temperature gas may be generated at the moment of entering the power battery explosion-proof valve and discharged from the power battery explosion-proof valve, and according to experimental data, the temperature of the gas can reach 200 DEG and 300 deg. In order to avoid the explosion-proof valve of the power battery from being damaged by high temperature, optionally, the top cover 1, the cavity base 3 and the piston rod 2 are all made of high temperature resistant materials. Preferably, the top cover 1, the cavity base 3 and the piston rod 2 are made of high temperature resistant metal material. In the embodiment, the top cover 1 and the cavity base 3 are made of aluminum alloy and are connected by laser welding; the piston rod 2 can be made of aluminum alloy, copper or steel. To avoid being affected by high temperature, optionally, the first sealing ring 4 and the second sealing ring 5 are made of high temperature resistant material, and preferably, the first sealing ring 4 and the second sealing ring 5 are made of fluororubber material.
Alternatively, the cavity base 3 and the canopy 1 may be integrally formed or may be separately connected. It should be noted that the cavity base 3 and the canopy 1, whether integrally formed or separately connected, should be encompassed by the scope of the present application.
The embodiment also provides a power battery, which comprises the power battery explosion-proof valve, so that the manufacturing cost of the power battery is reduced, and the use safety of the power battery is improved. Optionally, the explosion-proof valve of the power battery is connected with the top cover of the power battery in a welding mode, and the connection is reliable.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An explosion-proof valve for a power battery, comprising:
a cavity base (3) provided with a through hole (31);
the top cover (1) is connected with the cavity base (3), an air chamber cavity (12) with an opening at one end is formed in the top cover (1), the opening of the air chamber cavity (12) faces the through hole (31), and an air outlet (11) communicated with the through hole (31) is formed in the top cover (1);
the piston rod (2) is arranged in the through hole (31) in a sliding and sealing mode and can seal and block openings at two ends of the through hole (31), one end of the piston rod (2) is arranged in the air chamber cavity (12) in a sliding mode and is connected with the air chamber cavity (12) in a sealing mode to form a first air chamber; the piston rod (2) faces the top cover (1) to slide, so that openings at two ends of the through hole (31) are communicated, and the piston rod (2) is far away from the top cover (1) to slide and can be blocked by the openings at two ends of the through hole (31).
2. The power battery explosion-proof valve according to claim 1, wherein a first partition is arranged on the through hole (31), a second partition is arranged on the piston rod (2), the first partition and the second partition are matched to partition the through hole (31) into a mounting cavity (312) and a pressure relief cavity (311), the piston rod (2) is slidably connected in the mounting cavity (312), and the pressure relief cavity (311) is communicated with the exhaust port (11).
3. The power battery explosion-proof valve according to claim 2, wherein the first partition is a step (313) provided on the through hole (31), the second partition is a shaft shoulder (22) provided on the piston rod (2), the shaft shoulder (22) can abut on the step (313), and the shaft shoulder (22) moves in the pressure relief cavity (311).
4. The power battery explosion-proof valve according to any one of claims 1 to 3, wherein the opening pressure value of the power battery explosion-proof valve is A, the stroke of the piston rod (2) is B, the height of the air chamber cavity (12) is C, and the relation is B ═ 1- (1/C) (㏒ ^ 1/C)2(A*10))。
5. Power cell explosion-proof valve according to claim 4, characterized in that the height C of the air chamber cavity (12) is 2 mm.
6. The power cell explosion-proof valve according to claim 2 or 3, further comprising a first sealing ring (4), wherein the first sealing ring (4) is arranged between the piston rod (2) and the air chamber cavity (12).
7. The power battery explosion-proof valve according to claim 2 or 3, characterized in that the power battery explosion-proof valve further comprises a second sealing ring (5), wherein the second sealing ring (5) is arranged on the piston rod (2) and is hermetically connected between the mounting cavity (312) and the pressure relief cavity (311).
8. The power battery explosion-proof valve according to claim 2 or 3, wherein the exhaust port (11) is an annular hole symmetrically arranged between the pressure relief cavity (311) and the air chamber cavity (12).
9. The explosion-proof valve for the power battery according to any one of claims 1 to 3, wherein the top cover (1), the cavity base (3) and the piston rod (2) are all made of high-temperature resistant materials.
10. A power battery, characterized by comprising the power battery explosion-proof valve of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010687784.5A CN111668424A (en) | 2020-07-16 | 2020-07-16 | Power battery explosion-proof valve and power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010687784.5A CN111668424A (en) | 2020-07-16 | 2020-07-16 | Power battery explosion-proof valve and power battery |
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| Publication Number | Publication Date |
|---|---|
| CN111668424A true CN111668424A (en) | 2020-09-15 |
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ID=72392534
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010687784.5A Pending CN111668424A (en) | 2020-07-16 | 2020-07-16 | Power battery explosion-proof valve and power battery |
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| CN (1) | CN111668424A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474598A (en) * | 2012-06-08 | 2013-12-25 | 苏州宝时得电动工具有限公司 | Battery |
| CN108598333A (en) * | 2018-04-12 | 2018-09-28 | 珠海中能科技有限公司 | Explosion-proof valve and battery system |
| CN208240738U (en) * | 2018-05-18 | 2018-12-14 | 宁德时代新能源科技股份有限公司 | Secondary cell cap assembly and secondary cell |
| CN110620202A (en) * | 2019-09-20 | 2019-12-27 | 金怀璧 | Explosion-proof valve for power battery |
| CN212625945U (en) * | 2020-07-16 | 2021-02-26 | 湖北亿纬动力有限公司 | Power battery explosion-proof valve and power battery |
-
2020
- 2020-07-16 CN CN202010687784.5A patent/CN111668424A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474598A (en) * | 2012-06-08 | 2013-12-25 | 苏州宝时得电动工具有限公司 | Battery |
| CN108598333A (en) * | 2018-04-12 | 2018-09-28 | 珠海中能科技有限公司 | Explosion-proof valve and battery system |
| CN208240738U (en) * | 2018-05-18 | 2018-12-14 | 宁德时代新能源科技股份有限公司 | Secondary cell cap assembly and secondary cell |
| CN110620202A (en) * | 2019-09-20 | 2019-12-27 | 金怀璧 | Explosion-proof valve for power battery |
| CN212625945U (en) * | 2020-07-16 | 2021-02-26 | 湖北亿纬动力有限公司 | Power battery explosion-proof valve and power battery |
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