Anti-explosion valve of battery pack

Abstract

The utility model provides a battery pack explosion-proof valve which comprises a battery pack shell, an inner side support plate, an outer side support plate, an inner side sealing gasket, an outer side sealing gasket, an inner side explosion-proof membrane and an outer side explosion-proof membrane, a pressure relief hole is formed in the battery pack shell, and the inner side explosion-proof membrane and the outer side explosion-proof membrane cover the inner side and the outer side of the pressure relief hole respectively. The outer side sealing gasket is located between the outer side support plate and the outer side explosion-proof membrane, and the inner side sealing gasket is located between the inner side support plate and the inner side explosion-proof membrane; and when the internal space of the battery pack reaches a critical temperature, the inner side explosion-proof membrane and the outer side explosion-proof membrane are melted to open the pressure relief hole. According to the utility model, when the internal part of the battery pack is damaged and the temperature rises, and the internal temperature of the battery pack reaches a critical temperature, the inner side explosion-proof membrane and the outer side explosion-proof membrane are melted to open the pressure relief hole, and the internal part of the battery pack is subjected to pressure relief through the pressure relief hole. The utility model has the advantages of simple structure, thinner thickness, smaller occupied space and lower requirement on installation space, and is of a plate-shaped structure as a whole.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to an explosion-proof valve for a battery pack. Background Art

[0002] With the development of new energy, the safety performance and application range of battery packs have attracted more and more attention. The heat spread of battery packs requires that the battery packs can quickly cool down and control the temperature of surrounding cells. Since the internal space of the battery pack is a closed space, the heat and damage of some cells inside the battery pack will cause the pressure of the entire closed space inside the battery pack to increase sharply. It is required to install an explosion-proof valve in the closed battery pack. The explosion-proof valve plays a role in pressure relief to avoid the possibility of further explosion of the battery pack.

[0003] Traditional explosion-proof valves have complex structures, large volumes, and large requirements for installation space, making them difficult to apply to some small-sized battery packs. Summary of the invention

[0004] The utility model aims to solve the deficiencies in the prior art and provide a battery pack explosion-proof valve.

[0005] The purpose of the utility model is achieved through the following technical scheme: a battery pack explosion-proof valve, including a battery pack shell, an inner bracket plate, an outer bracket plate, an inner sealing gasket, an outer sealing gasket, an inner explosion-proof membrane, and an outer explosion-proof membrane, the battery pack shell is provided with a pressure relief hole, the inner explosion-proof membrane and the outer explosion-proof membrane respectively cover the inner and outer sides of the pressure relief hole, the outer sealing gasket is located between the outer bracket plate and the outer explosion-proof membrane, and the inner sealing gasket is located between the inner bracket plate and the inner explosion-proof membrane; when the internal space of the battery pack reaches a critical temperature, the inner explosion-proof membrane and the outer explosion-proof membrane melt to open the pressure relief hole.

[0006] In the utility model, the inner explosion-proof membrane and the outer explosion-proof membrane are arranged on the inner and outer sides of the pressure relief hole in an adhesive manner, the inner support plate presses the inner sealing pad, and the outer support plate presses the outer sealing pad, and the sealing is achieved by the inner sealing pad and the outer sealing pad; when the battery pack is damaged and the temperature rises, after the temperature inside the battery pack reaches the critical temperature, the inner explosion-proof membrane and the outer explosion-proof membrane melt to open the pressure relief hole, and the pressure inside the battery pack is relieved through the pressure relief hole to avoid the battery pack from exploding. The utility model has a simple structure, an overall plate-like structure, a thin thickness, a small space occupation, and a low requirement for installation space. It is easy to install on some small-sized battery packs, and multiple explosion-proof valves can be flexibly arranged on the same battery pack, which greatly improves its applicability.

[0007] Preferably, the outer sealing gasket and the inner sealing gasket are both made of silicone.

[0008] Preferably, the critical temperature is 110°C.

[0009] Preferably, the inner explosion-proof membrane and the outer explosion-proof membrane are both made of PVC material, and the thickness of the inner explosion-proof membrane and the outer explosion-proof membrane are both 0.025 mm.

[0010] Preferably, the inner explosion-proof membrane and the outer explosion-proof membrane are both circular, and the diameter of the inner explosion-proof membrane and the outer explosion-proof membrane is greater than three times the diameter of the pressure relief hole. The diameter of the inner explosion-proof membrane and the outer explosion-proof membrane is greater than three times the diameter of the pressure relief hole, so that there is sufficient contact area between the inner explosion-proof membrane, the outer explosion-proof membrane and the battery pack shell, so that the inner explosion-proof membrane and the outer explosion-proof membrane can be fully bonded to the battery pack shell.

[0011] Preferably, the outer bracket plate and the inner bracket plate are connected by screws, the outer bracket plate is provided with an outer bracket plate screw hole, and the inner bracket plate is provided with an inner bracket plate screw hole; the screw passes through the outer bracket plate screw hole and is connected to the inner bracket plate screw hole.

[0012] Preferably, the battery pack shell is provided with a battery pack shell screw hole through which a screw can pass, the outer sealing gasket is provided with an outer sealing gasket screw hole through which a screw can pass, and the inner sealing gasket is provided with an inner sealing gasket screw hole through which a screw can pass.

[0013] Preferably, the outer sealing gasket is provided with an outer sealing gasket through hole corresponding to the pressure relief hole, and the inner sealing gasket is provided with an inner sealing gasket through hole corresponding to the pressure relief hole.

[0014] The beneficial effect of the utility model is that when the battery pack is damaged and the temperature rises, when the temperature inside the battery pack reaches the critical temperature, the inner explosion-proof membrane and the outer explosion-proof membrane melt to open the pressure relief hole, and the pressure inside the battery pack is relieved through the pressure relief hole to prevent the battery pack from exploding. The utility model has a simple structure, an overall plate-like structure, a thin thickness, a small space occupation, and a low installation space requirement, making it easy to install on some small-sized battery packs, and multiple explosion-proof valves can be flexibly arranged on the same battery pack, greatly improving its applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural explosion diagram of the utility model.

[0016] In the figure: 1. screws, 2. outer bracket plate, 3. outer sealing gasket, 4. battery pack shell, 5. outer explosion-proof membrane, 6. inner explosion-proof membrane, 7. inner sealing gasket, 8. inner bracket plate, 9. pressure relief hole, 10. outer bracket plate through hole, 11. outer bracket plate screw hole, 12. outer sealing gasket through hole, 13. outer sealing gasket screw hole, 14. battery pack shell screw hole, 15. inner sealing gasket through hole, 16. inner sealing gasket screw hole, 17. inner bracket plate screw hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0018] like Figure 1 As shown, a battery pack explosion-proof valve includes a battery pack shell 4, an inner bracket plate 8, an outer bracket plate 2, an inner sealing gasket 7, an outer sealing gasket 3, an inner explosion-proof membrane 6, and an outer explosion-proof membrane 5. The battery pack shell 4 is provided with a pressure relief hole 9, which is a circular hole. The inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 cover the inner and outer sides of the pressure relief hole 9, respectively. In this embodiment, the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 are arranged on the inner and outer sides of the pressure relief hole 9 in an adhesive manner, the outer sealing gasket 3 is located between the outer bracket plate 2 and the outer explosion-proof membrane 5, and the inner sealing gasket 7 is located between the inner bracket plate 8 and the inner explosion-proof membrane 6. The outer sealing gasket 3 and the inner sealing gasket 7 are both made of silicone. The inner bracket plate 8 presses the inner sealing gasket 7, and the outer bracket plate 2 presses the outer sealing gasket 3.

[0019] The inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 are both made of PVC material, and the thickness of the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 are both 0.025mm. In addition, the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 are both circular, and the diameter of the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 is greater than three times the diameter of the pressure relief hole 9, so that there is sufficient contact area between the inner explosion-proof membrane 6, the outer explosion-proof membrane 5 and the battery pack shell 4, so that the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 can be fully bonded to the battery pack shell 4.

[0020] The outer bracket plate 2 and the inner bracket plate 8 are connected by screws 1, and the outer bracket plate 2 is provided with an outer bracket plate screw hole 11, and the inner bracket plate 8 is provided with an inner bracket plate screw hole 17. The screw 1 passes through the outer bracket plate screw hole 11 and is connected to the inner bracket plate screw hole 17. The battery pack shell 4 is provided with a battery pack shell screw hole 14 through which the screw 1 can pass, the outer sealing gasket 3 is provided with an outer sealing gasket screw hole 13 through which the screw 1 can pass, and the inner sealing gasket 7 is provided with an inner sealing gasket screw hole 16 through which the screw 1 can pass.

[0021] The outer sealing pad 3 is provided with an outer sealing pad through hole 12 corresponding to the pressure relief hole 9, and the inner sealing pad 7 is provided with an inner sealing pad through hole 15 corresponding to the pressure relief hole 9. The diameters of the outer sealing pad through hole 12 and the inner sealing pad through hole 15 are both larger than the diameter of the pressure relief hole 9.

[0022] When the internal space of the battery pack reaches a critical temperature, the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 melt to open the pressure relief hole 9. In this embodiment, the critical temperature is 110°C.

[0023] In the utility model, when the battery pack is damaged and the temperature rises, after the temperature inside the battery pack reaches the critical temperature, the inner explosion-proof membrane 6 and the outer explosion-proof membrane 5 melt to open the pressure relief hole 9, and the pressure inside the battery pack is relieved through the pressure relief hole 9 to prevent the battery pack from exploding. The utility model has a simple structure, an overall plate-like structure, a thin thickness, a small space occupation, and a low installation space requirement, and is easy to install on some small-sized battery packs, and multiple explosion-proof valves can be flexibly arranged on the same battery pack, greatly improving its applicability.

[0024] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. A battery pack explosion-proof valve, characterized in that: It includes a battery pack shell, an inner bracket plate, an outer bracket plate, an inner sealing gasket, an outer sealing gasket, an inner explosion-proof membrane, and an outer explosion-proof membrane. A pressure relief hole is provided on the battery pack shell. The inner explosion-proof membrane and the outer explosion-proof membrane respectively cover the inner and outer sides of the pressure relief hole. The outer sealing gasket is located between the outer bracket plate and the outer explosion-proof membrane, and the inner sealing gasket is located between the inner bracket plate and the inner explosion-proof membrane. When the internal space of the battery pack reaches the critical temperature, the inner explosion-proof membrane and the outer explosion-proof membrane melt to open the pressure relief hole.

2. The battery pack explosion-proof valve according to claim 1, characterized in that: Both the outer and inner gaskets are made of silicone.

3. The battery pack explosion-proof valve according to claim 1, characterized in that: The critical temperature is 110°C.

4. The battery pack explosion-proof valve according to claim 1, characterized in that: The inner explosion-proof membrane and the outer explosion-proof membrane are both made of PVC material, and the thickness of the inner explosion-proof membrane and the outer explosion-proof membrane is 0.025 mm.

5. The battery pack explosion-proof valve according to claim 1, characterized in that: The inner explosion-proof membrane and the outer explosion-proof membrane are both circular, and the diameters of the inner explosion-proof membrane and the outer explosion-proof membrane are greater than three times the diameter of the pressure relief hole.

6. The battery pack explosion-proof valve according to any one of claims 1 to 5, characterized in that: The outer bracket plate and the inner bracket plate are connected by screws. The outer bracket plate is provided with an outer bracket plate screw hole, and the inner bracket plate is provided with an inner bracket plate screw hole; the screw passes through the outer bracket plate screw hole and is connected with the inner bracket plate screw hole.

7. The explosion-proof valve of the battery pack according to claim 6, characterized in that: The battery pack shell is provided with a battery pack shell screw hole through which a screw can pass, the outer sealing gasket is provided with an outer sealing gasket screw hole through which a screw can pass, and the inner sealing gasket is provided with an inner sealing gasket screw hole through which a screw can pass.

8. The battery pack explosion-proof valve according to claim 6, characterized in that: The outer sealing gasket is provided with an outer sealing gasket through hole corresponding to the pressure relief hole, and the inner sealing gasket is provided with an inner sealing gasket through hole corresponding to the pressure relief hole.

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