阅读说明：本技术 一种动力电池防爆阀 (Explosion-proof valve for power battery ) 是由 金怀璧 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种动力电池防爆阀,包括防爆基座,其固定设置在电池包上；防爆罩,其固定设置在防爆基座上；活塞,其活动设置在防爆基座上开设的孔内,所述活塞四周均匀设置排气道,所述活塞位于防爆基座内腔中的一端设置有重块；以及气囊,其固定设置在活塞上端的凹形结构上,位于防爆罩和活塞之间。本发明通过设置气囊,在电池包长期使用过程中,不断对电池包产生的气体进行泄压,避免了其弹性的衰减,提高了在泄压过程中的密封性能；同时,通过设置泄压活塞和重球等,能够在电池包出现短路等紧急情况时,能够瞬间排出电池包内产生的气体,避免电池包的爆炸,极大地提高了电池包的安全性能。(The invention discloses an explosion-proof valve of a power battery, which comprises an explosion-proof base, a valve body and a valve body, wherein the explosion-proof base is fixedly arranged on a battery pack; the explosion-proof cover is fixedly arranged on the explosion-proof base; the piston is movably arranged in a hole formed in the explosion-proof base, the periphery of the piston is uniformly provided with exhaust passages, and one end of the piston, which is positioned in the inner cavity of the explosion-proof base, is provided with a weight block; and the air bag is fixedly arranged on the concave structure at the upper end of the piston and is positioned between the explosion-proof cover and the piston. By arranging the air bag, the gas generated by the battery pack is continuously decompressed in the long-term use process of the battery pack, so that the elasticity of the battery pack is prevented from being attenuated, and the sealing performance in the decompression process is improved; simultaneously, through setting up pressure release piston and heavy ball etc. can be when emergency such as short circuit appears in the battery package, the explosion of battery package is avoided to the gas that produces in the battery package of can discharging in the twinkling of an eye, has greatly improved the security performance of battery package.)

1. An explosion-proof valve of power battery which characterized in that: comprises that

The battery pack comprises an explosion-proof base (1) which is fixedly arranged on the battery pack, wherein the explosion-proof base (1) is of a cavity structure, and a pressure relief cavity (11) is formed in the cavity;

the explosion-proof cover (2) is fixedly arranged on the explosion-proof base (1), and an exhaust port (7) is formed in the explosion-proof cover (2);

the piston (3) is movably arranged in a hole formed in the explosion-proof base (1), exhaust passages are uniformly formed in the periphery of the piston (3), a concave structure is arranged at the upper end of the piston (3), a sharp-pointed device used for puncturing the air bag (5) is arranged in the concave structure, cavities which are matched with each other are respectively formed in the contact surfaces of the piston (3) and the explosion-proof base (1), a heavy ball (31) is movably arranged in the cavity on the piston (3), and a heavy block (4) is arranged at one end of the piston (3) in the inner cavity of the explosion-proof base (1); and

and the air bag (5) is fixedly arranged on a concave structure at the upper end of the piston (3) and is positioned between the explosion-proof cover (2) and the piston (3), and a pressure pointer (6) is arranged between the air bag (5) and the explosion-proof cover (2).

2. The explosion-proof valve for the power battery as recited in claim 1, wherein: and a sealing bulge (12) is arranged in the inner cavity of the explosion-proof base (1).

3. The explosion-proof valve for the power battery as recited in claim 1, wherein: and a sealing gasket (8) is arranged between the contact surface of the explosion-proof base (1) and the battery pack.

4. The explosion-proof valve for the power battery as recited in claim 1, wherein: the air inlet of the exhaust passage is positioned in the pressure relief cavity (11), and the heights of the air outlets of the exhaust passage are sequentially increased.

5. The explosion-proof valve for the power battery as recited in claim 1, wherein: and a sealing cover is arranged on the exhaust port (7).

6. The explosion-proof valve for the power battery as recited in claim 1, wherein: the anti-explosion device is characterized in that the anti-explosion base (1) is provided with an external thread, the anti-explosion cover (2) is provided with an internal thread, and the anti-explosion cover (2) is arranged on the anti-explosion base (1) through the mutually meshed threads.

7. The explosion-proof valve for the power battery as recited in claim 1, wherein: the pressure pointer (6) is of an inverted T-shaped structure, the horizontal section of the pressure pointer (6) is in contact with the air bag (5), and the vertical section of the pressure pointer (6) extends to the outer side of the explosion-proof cover (2).

8. The explosion-proof valve for the power battery as recited in claim 7, wherein: and scales are arranged on the vertical section of the pressure pointer (6) positioned on the outer side of the explosion-proof cover (2).

Technical Field

The invention relates to the technical field of power battery explosion-proof equipment, in particular to a power battery explosion-proof valve.

Background

The existing automobile power battery (such as a lithium ion battery) needs to be charged and discharged continuously in the use process, so that more and more gas is generated in the power battery due to electrochemical reaction, and in order to prevent explosion accidents caused by excessive gas generated in the power battery, the existing power battery is provided with an explosion-proof valve.

The existing battery explosion-proof valve is generally provided with an elastic element, when the gas pressure generated by the battery is greater than the elastic force of the elastic element, the explosion-proof valve is opened to realize exhaust and pressure reduction, so that the explosion caused by excessive gas accumulation in the power battery is avoided, but the following obvious defects exist in the process:

1. when the battery is in abnormal conditions such as short circuit, overcharge and overdischarge, the internal pressure of the battery is rapidly increased, and the explosion-proof valve cannot instantly and completely release air to achieve the aim of explosion prevention;

2. the elasticity of the elastic element is degraded in the long-term use process, so that the sealing performance of the explosion-proof valve is poor.

Disclosure of Invention

The invention aims to provide an explosion-proof valve for a power battery, which solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an explosion-proof valve for power battery comprises

The battery pack comprises an explosion-proof base, a battery pack and a battery pack, wherein the explosion-proof base is fixedly arranged on the battery pack and is of a cavity structure, and a pressure relief cavity is formed in the cavity;

the explosion-proof cover is fixedly arranged on the explosion-proof base and is provided with an exhaust port;

the piston is movably arranged in a hole formed in the explosion-proof base, exhaust passages are uniformly formed in the periphery of the piston, a concave structure is arranged at the upper end of the piston, a spine device used for piercing an air bag is arranged in the concave structure, mutually matched cavities are respectively formed in the contact surfaces of the piston and the explosion-proof base, a heavy ball is movably arranged in the cavity on the piston, and a heavy block is arranged at one end of the piston, which is positioned in the inner cavity of the explosion-proof base; and

and the air bag is fixedly arranged on the concave structure at the upper end of the piston and is positioned between the explosion-proof cover and the piston, and a pressure pointer is arranged between the air bag and the explosion-proof cover.

Preferably, a sealing bulge is arranged in the inner cavity of the explosion-proof base.

Preferably, a sealing gasket is arranged between the contact surface of the explosion-proof base and the battery pack.

Preferably, the air inlet of the exhaust passage is positioned in the pressure relief cavity, and the heights of the air outlets of the exhaust passage are sequentially increased.

Preferably, a sealing cover is arranged on the exhaust port.

Preferably, the explosion-proof base is provided with external threads, the explosion-proof cover is provided with internal threads, and the explosion-proof cover is arranged on the explosion-proof base through the mutually meshed threads.

Preferably, the pressure pointer is of an inverted T-shaped structure, the horizontal section of the pressure pointer is in contact with the air bag, and the vertical section of the pressure pointer extends to the outer side of the explosion-proof cover.

Preferably, the vertical section of the pressure pointer positioned outside the explosion-proof cover is provided with scales.

Compared with the prior art, the invention has the beneficial effects that:

by arranging the air bag, the gas generated by the battery pack is continuously decompressed in the long-term use process of the battery pack, so that the elasticity of the battery pack is prevented from being attenuated, and the sealing performance in the decompression process is improved; simultaneously, through setting up pressure release piston and heavy ball etc. can be when emergency such as short circuit appears in the battery package, the explosion of battery package is avoided to the gas that produces in the battery package that can discharge in the twinkling of an eye, has greatly improved the security performance of battery package, has avoided causing equipment and personnel's harm because of the explosion of battery package.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged schematic view of the structure of the area a in fig. 1.

In the figure: 1 explosion-proof base, 11 pressure relief cavities, 12 sealing bulges, 2 explosion-proof covers, 3 pressure relief pistons, 31 heavy balls, 4 weights, 5 air bags, 6 pressure pointers, 7 exhaust ports and 8 sealing gaskets.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

Referring to fig. 1-2, the present invention provides a technical solution:

an explosion-proof valve for power battery comprises

The explosion-proof valve comprises an explosion-proof base 1, a battery pack and a sealing gasket 8, wherein the explosion-proof base 1 is fixedly arranged on the battery pack through welding or bolts, an exhaust port of the battery pack is communicated with the explosion-proof base 1, the explosion-proof base 1 is of a cavity structure, a pressure relief cavity 11 is formed in the cavity of the explosion-proof base 1, gas generated by the battery pack enters the pressure relief cavity 11, the sealing gasket 12 is arranged in the inner cavity of the explosion-proof base 1, the sealing gasket 8 is arranged between the contact surface of the explosion-proof base 1 and the battery pack, and the arrangement of the sealing gasket 8 and the sealing gasket 12 ensures the sealing property of the;

the explosion-proof cover 2 is fixedly arranged on the explosion-proof base 1, an exhaust port 7 is formed in the explosion-proof cover 2, a sealing cover is arranged on the exhaust port 7, in the process of exhausting and relieving pressure, the sealing cover is automatically opened by pressure generated by gas to realize exhausting and relieving pressure, the sealing cover is in a normally closed state, the situation that impurity particles such as dust and the like enter the interior of an explosion-proof valve nuclear battery pack is avoided, external threads are formed in the explosion-proof base 1, internal threads are formed in the explosion-proof cover 2, the explosion-proof cover 2 is arranged on the explosion-proof base 1 through mutually meshed threads, the explosion-proof base 1 and the explosion-proof cover 2 are detachably connected with each other through the threads, on one hand, checking and replacement of the weight 4, the air bag 5 and the pressure pointer 6 are facilitated, on the other hand, the pressure of the;

a piston 3 movably arranged in a hole formed on the explosion-proof base 1, exhaust passages are uniformly arranged around the piston 3, an air inlet of the exhaust passage is positioned in a pressure relief cavity 11, the heights of air outlets of the exhaust passages are sequentially increased, a concave structure is arranged at the upper end of the piston 3, a sharp pricking device for pricking an air bag 5 is arranged in the concave structure, cavities which are mutually matched are respectively arranged on the contact surfaces of the piston 3 and the explosion-proof base 1, a heavy ball 31 is movably arranged in the cavity on the piston 3, a heavy block 4 is arranged at one end of the piston 3 positioned in the inner cavity of the explosion-proof base 1, gas in the pressure relief cavity 11 enters the exhaust passage through the air inlet of the exhaust passage, the piston 3 moves upwards, when the air outlets of the exhaust passages with different heights are sequentially exposed, continuous pressure relief and exhaust are realized, when limit conditions such as short circuit and the, the heavy ball 31 enters the cavity of the explosion-proof base 1, the piston 3 becomes light in weight and more convenient to move upwards, the spine device punctures the air bag 5 to enable the piston 3 to reach the extreme pressure relief position, and the air outlets of the exhaust passages at different heights on the piston 3 are all exposed, so that the extreme exhaust and pressure relief are realized; and

the gasbag 5, it is fixed to be set up on the spill structure of piston 3 upper end, be located between explosion-proof cover 2 and the piston 3, be provided with pressure pointer 6 between gasbag 5 and the explosion-proof cover 2, pressure pointer 6 is "T" type structure, 6 horizontal segments of pressure pointer and 5 contacts of gasbag, 6 vertical segments of pressure pointer extend to the explosion-proof cover 2 outside, pressure pointer 6 is located and is provided with the scale on the vertical segment in the explosion-proof cover 2 outside, can judge the pressure situation in the battery package through the scale on the 6 epitaxial tip of pressure pointer.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.