Explosion-proof valve and battery pack

Abstract

The utility model provides an explosion-proof valve and a battery pack, the explosion-proof valve comprises a valve body, a piston and an elastic piece, the valve body is provided with a vent hole, the piston comprises a sealing cover and a sliding rod, and the sliding rod is connected with the sealing cover and penetrates through the valve body in a sliding mode; the elastic piece is arranged between the sliding rod and the valve body, and the sealing cover blocks the ventilation hole under the elastic effect of the elastic piece. And at the preset temperature, the sliding rod can be disconnected, so that the sealing cover can fall off from the valve body. According to the explosion-proof valve disclosed by the utility model, the piston and the elastic piece are arranged on the valve body, and the sliding rod of the piston can be disconnected at the preset temperature, so that the explosion-proof valve can be conveniently opened under the condition that the pressure in the battery pack is relatively high, and after the temperature in the battery pack rises to the preset temperature, the explosion-proof valve can also be opened; therefore, the opening mode of the anti-explosion valve is optimized, and the safety performance of the battery pack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to an explosion-proof valve. At the same time, the utility model also relates to a battery pack provided with the explosion-proof valve. Background Art

[0002] The main function of the explosion-proof valve in the battery pack is to dissipate excess heat and release excess gas in time when the entire battery pack is out of control through the explosion of the explosion-proof valve itself, so as to ensure the safety performance of the battery pack. However, the existing explosion-proof valve is limited by its own structure, and its opening condition is often only determined by the pressure inside the battery pack. Its working principle is that when the pressure inside the battery pack exceeds the standard safety pressure, the top spring is compressed to open the explosion-proof valve. With this setting, the opening method is relatively single and the safety performance of the battery pack cannot be guaranteed. Utility Model Content

[0003] In view of this, the utility model aims to propose an explosion-proof valve to optimize the opening method of the explosion-proof valve and ensure the safety performance of the battery pack.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] An explosion-proof valve comprises a valve body, a piston and an elastic member;

[0006] The valve body is provided with a ventilation hole, the piston includes a cover, and a slide rod connected to the cover and slidably arranged on the valve body; the elastic member is arranged between the slide rod and the valve body, and under the elastic action of the elastic member, the cover blocks the ventilation hole;

[0007] At a preset temperature, the slide rod can be disconnected, so that the cover can fall off from the valve body.

[0008] Furthermore, the sliding rod includes an intermediate rod made of glass, one end of the intermediate rod is connected to the sealing cover, a cavity is formed in the intermediate rod, and the cavity is filled with working fluid.

[0009] Furthermore, the working fluid is kerosene.

[0010] Furthermore, the elastic member includes a spring sleeved on the middle rod.

[0011] Furthermore, the slide rod further comprises a blocking member disposed at one end of the intermediate rod away from the sealing cover and used for blocking the spring;

[0012] One end of the spring abuts against the valve body, and the other end of the spring abuts against the blocking member.

[0013] Furthermore, a connecting column is provided on the sealing cover, and the intermediate rod is threadedly connected to the connecting column and / or the blocking member.

[0014] Furthermore, the valve body is provided with a sealing member for sealing the gap between the valve body and the shell of the battery pack.

[0015] Furthermore, a protective cover is provided on the valve body, and the protective cover and the valve body are surrounded to form a receiving space;

[0016] One end of the sliding rod away from the sealing cover extends into the accommodating space.

[0017] Furthermore, a communication port communicating with the accommodating space is formed between the protective cover and the valve body.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The explosion-proof valve described in the utility model is provided with a piston and an elastic member on the valve body, and the sliding rod of the piston can be disconnected at a preset temperature, so that the explosion-proof valve can be opened under the condition of high pressure in the battery pack. At the same time, the explosion-proof valve can also be opened after the temperature in the battery pack rises to a preset temperature, thereby optimizing the opening method of the explosion-proof valve and ensuring the safety performance of the battery pack.

[0020] In addition, by making the slide rod include an intermediate rod made of glass, forming a cavity in the intermediate rod, and filling the cavity with working fluid, the slide rod is conveniently disconnected at a preset temperature, and the structure is simple and convenient to set.

[0021] In addition, by providing a protective cover, glass fragments generated after the middle rod breaks can fall into the storage space, thereby preventing the glass fragments from falling into the battery pack and damaging the internal components of the battery pack, affecting the subsequent use of the battery pack.

[0022] Another object of the present invention is to provide a battery pack, wherein the battery pack is provided with the explosion-proof valve as described above.

[0023] The battery pack described in the utility model and the above-mentioned explosion-proof valve have the same technical effects as the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve according to an embodiment of the utility model;

[0026] Figure 2 It is a partial structural schematic diagram of the explosion-proof valve according to an embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the piston described in the embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the internal structure of the intermediate rod according to an embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the sealing cover according to an embodiment of the utility model;

[0030] Figure 6 It is a schematic structural diagram of the valve body and the protective cover described in an embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1. Valve body; 101. Ventilation hole; 2. Piston; 201. Sliding rod; 2011. Intermediate rod; 2012. Blocking member; 202. Sealing cover; 3. Elastic member; 4. Cavity; 5. Working fluid; 6. Connecting column; 7. Protective cover; 8. Connecting port; 9. Sealing member; 10. First threaded hole; 11. Second external threaded portion. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Embodiment 1

[0038] This embodiment relates to an explosion-proof valve, the overall structure of which is as follows: Figure 1 and Figure 2 As shown in , the explosion-proof valve includes a valve body 1, a piston 2 and an elastic member 3. The valve body 1 is provided with a vent hole 101, the piston 2 includes a cover 202, and a slide bar 201 connected to the cover 202 and slidably arranged on the valve body 1; the elastic member 3 is arranged between the slide bar 201 and the valve body 1, and under the elastic action of the elastic member 3, the cover 202 blocks the vent hole 101. At a preset temperature, the slide bar 201 can be disconnected, so that the cover 202 can fall off from the valve body 1.

[0039] The explosion-proof valve of this embodiment is provided with a piston 2 and an elastic member 3 on the valve body 1, and the slide rod 201 of the piston 2 can be disconnected at a preset temperature, so that the explosion-proof valve can be opened when the pressure in the battery pack is relatively high. At the same time, the explosion-proof valve can also be opened after the temperature in the battery pack rises to a preset temperature, thereby optimizing the opening method of the explosion-proof valve and ensuring the safety performance of the battery pack.

[0040] Compared with the existing explosion-proof valve that can only be opened when the pressure in the battery pack reaches a specified pressure, the structure of the explosion-proof valve in this embodiment adds a temperature condition for the opening of the explosion-proof valve, that is, when the pressure in the battery pack is small but the temperature is high, the explosion-proof valve can also be opened, thereby facilitating the release of high heat in the battery pack and further ensuring the safety performance of the battery pack.

[0041] Based on the above overall introduction, as a preferred implementation method, Figure 2 , Figure 3 and Figure 4 As shown in FIG. 1 , in this embodiment, the slide bar 201 includes an intermediate rod 2011 made of glass, one end of the intermediate rod 2011 is connected to the cover 202, a cavity 4 is formed in the intermediate rod 2011, and the cavity 4 is filled with a working fluid 5. This arrangement facilitates the slide bar 201 to be disconnected at a preset temperature, and the structure is simple and easy to arrange. In actual use, the working fluid 5 in the cavity 4 can be heated and expanded to break the intermediate rod 2011 made of glass, thereby achieving the effect of enabling the slide bar 201 to be disconnected at a preset temperature.

[0042] As a preferred implementation, the working fluid 5 of this embodiment can be kerosene, which is easy to obtain and has a low cost. Of course, the working fluid 5 of this embodiment can also be other high expansion rate liquids commonly used in the prior art, such as ether. In addition, in specific implementation, different types and different amounts of working fluids 5 can be injected into the cavity 4 to achieve the intermediate rod 2011 being broken at different temperatures.

[0043] As a preferred example, Figure 2 As shown in FIG. 2 , in this embodiment, the elastic member 3 includes a spring sleeved on the middle rod 2011. It can be understood that by making the elastic member 3 include a spring, the structure is simple and easy to assemble. Figure 2 and Figure 3 As shown in the figure, the slide rod 201 also includes a blocking member 2012 which is arranged at one end of the intermediate rod 2011 away from the cover 202 and is used to block the spring. One end of the spring abuts against the valve body 1, and the other end of the spring abuts against the blocking member 2012. Such a configuration has a simple structure and is convenient for assembling the spring.

[0044] As a preferred implementation method, Figure 5 As shown in , in this embodiment, a connection column 6 is provided on the cover 202, and the intermediate rod 2011 is threadedly connected to the connection column 6 and the blocking member 2012. In specific implementation, a first threaded hole 10 can be provided on the cross section of the intermediate rod 2011 near one end of the connection column 6, and a first external threaded portion can be provided on the circumference of the connection column 6, so as to realize the threaded connection between the intermediate rod 2011 and the connection column 6. In addition, a second external threaded portion 11 can be provided on one end of the intermediate rod 2011 near the blocking member 2012, and a second threaded hole can be provided on the blocking member 2012, so as to realize the threaded connection between the intermediate rod 2011 and the blocking member 2012.

[0045] In this embodiment, the intermediate rod 2011 is connected to the connecting column 6 and the blocking member 2012 by threaded connection, so the connection structure is simple and the connection operation is convenient. Of course, in this embodiment, the threaded connection of the intermediate rod 2011, the connecting column 6 and the blocking member 2012 is only used as a preferred embodiment. In addition, the intermediate rod 2011 and the connecting column 6 or the blocking member 2012 can also be connected by other connection methods, such as bonding.

[0046] It should also be noted that, in the present embodiment, a separately arranged blocking member 2012 is provided at the end of the intermediate rod 2011 away from the sealing cover 202, which is only used as a preferred implementation mode. In a specific implementation, a blocking portion extending radially outwardly along the intermediate rod 2011 may also be provided at the end of the intermediate rod 2011 away from the sealing cover 202. In this case, the blocking portion and the intermediate rod 2011 are integrally arranged.

[0047] As a preferred implementation method, Figure 2As shown in FIG. 1 , in this embodiment, a seal 9 is provided on the valve body 1 for sealing the gap between the valve body 1 and the shell of the battery pack. The seal 9 of this embodiment can be a seal ring commonly used in existing explosion-proof valves, and its structure is not described in detail here. By providing the seal 9 on the valve body 1, the gap between the valve body 1 and the shell of the battery pack is sealed, which is conducive to ensuring the sealing performance of the battery pack during use.

[0048] As a preferred example, Figure 1 and Figure 2 As shown in FIG, a protective cover 7 is provided on the valve body 1, and the protective cover 7 and the valve body 1 form a receiving space. The end of the slide bar 201 away from the cover 202 extends into the receiving space. By providing the protective cover 7, the glass fragments generated after the intermediate rod 2011 breaks can fall into the receiving space, thereby preventing the glass fragments from falling into the battery pack to damage the internal components of the battery pack and affecting the subsequent use effect of the battery pack.

[0049] As a preferred implementation method, Figure 6 As shown in the figure, in the present embodiment, a connecting port 8 connected to the accommodating space is formed between the shield 7 and the valve body 1, so that the connection between the accommodating space and the inside of the battery pack is ensured, the high-temperature gas in the battery pack enters the accommodating space, and the sliding of the sliding rod 201 relative to the valve body 1 is facilitated.

[0050] The explosion-proof valve of this embodiment is provided with a piston 2 and an elastic member 3 on the valve body 1, and the slide rod 201 of the piston 2 can be disconnected at a preset temperature, so that the explosion-proof valve can be opened when the pressure in the battery pack is relatively high. At the same time, the explosion-proof valve can also be opened after the temperature in the battery pack rises to a preset temperature, thereby optimizing the opening method of the explosion-proof valve and ensuring the safety performance of the battery pack.

[0051] Embodiment 2

[0052] This embodiment relates to a battery pack, on which the explosion-proof valve in the first embodiment is provided.

[0053] The battery pack of this embodiment has the same technical effect as the explosion-proof valve in the first embodiment compared with the prior art, and will not be described in detail here.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof valve, characterized in that: It includes a valve body, a piston and an elastic member; The valve body is provided with a ventilation hole, the piston includes a cover, and a slide rod connected to the cover and slidably arranged on the valve body; the elastic member is arranged between the slide rod and the valve body, and under the elastic action of the elastic member, the cover blocks the ventilation hole; At a preset temperature, the slide rod can be disconnected, so that the cover can fall off from the valve body.

2. The explosion-proof valve according to claim 1, characterized in that: The sliding rod comprises an intermediate rod made of glass, one end of the intermediate rod is connected to the sealing cover, a cavity is formed in the intermediate rod, and the cavity is filled with working fluid.

3. The explosion-proof valve according to claim 2, characterized in that: The working fluid is kerosene.

4. The explosion-proof valve according to claim 2, characterized in that: The elastic member comprises a spring sleeved on the middle rod.

5. The explosion-proof valve according to claim 4, characterized in that: The slide rod further comprises a blocking member disposed at one end of the intermediate rod away from the cover and used for blocking the spring; One end of the spring abuts against the valve body, and the other end of the spring abuts against the blocking member.

6. The explosion-proof valve according to claim 5, characterized in that: The sealing cover is provided with a connecting column, and the intermediate rod is threadedly connected with the connecting column and / or the blocking member.

7. The explosion-proof valve according to claim 1, characterized in that: The valve body is provided with a sealing member for sealing a gap between the valve body and a shell of the battery pack.

8. The explosion-proof valve according to claim 1, characterized in that: The valve body is provided with a protective cover, and the protective cover and the valve body are surrounded to form a receiving space; One end of the sliding rod away from the sealing cover extends into the accommodating space.

9. The explosion-proof valve according to claim 8, characterized in that: A communication port communicating with the accommodation space is formed between the shield and the valve body.

10. A battery pack, characterized in that: The battery pack is provided with an explosion-proof valve as claimed in any one of claims 1 to 9.

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