CN218677478U - Explosion-proof valve and battery pack - Google Patents

Abstract

The utility model discloses an explosion-proof valve and a battery pack. The explosion-proof valve comprises: a main body, which includes a first opening and a second opening that are arranged on opposite end surfaces of the main body and communicate with each other; a pressing piece, which covers the first opening; One end of which is connected to the main body, and the other end is connected to the pressing piece; the raised part is arranged on the peripheral side of the first opening, and the side wall of the raised part is provided with an air outlet; the cover is arranged on the raised part facing away from the At the end of the first opening, the cover is provided with a through hole axially penetrating through. The battery pack includes the aforementioned explosion-proof valve. The explosion-proof valve of the utility model can not only discharge the high-temperature gas in the battery pack in a direction, but also has the function of being inflatable, so as to realize the detection of the airtightness of the battery pack.

Description

A kind of explosion-proof valve and battery pack

technical field

The utility model relates to the technical field of batteries, in particular to an explosion-proof valve and a battery pack.

Background technique

As people pay more attention to environmental protection, new energy vehicles are becoming more and more popular. As the core component of new energy vehicles, the safety of battery packs is of paramount importance. Thermal runaway is a common safety problem in battery packs. The energy generated by the thermal runaway of the single cells in the battery pack is emitted to the outside of the battery pack, resulting in safety accidents such as battery pack explosions.

In order to solve the above problems, the conventional method is to install an explosion-proof valve on the battery pack case to release the pressure of the battery pack in time. However, the current explosion-proof valve only has the function of directional or non-directional exhaust. If you want to test the airtightness of the battery pack, you need to open another gas exchange channel on the battery pack. The process is cumbersome and the structure is complicated.

Utility model content

In order to overcome at least one defect of the above-mentioned prior art, the utility model provides an explosion-proof valve, which can not only discharge the high-temperature gas in the battery pack in a direction, but also has the function of being inflatable to realize the airtightness of the battery pack. detection.

The technical scheme that the utility model adopts for solving its problem is:

An explosion-proof valve is provided, comprising:

a main body, which includes a first opening and a second opening arranged on opposite end surfaces of the main body and communicating with each other;

a pressing sheet covering the first opening;

An elastic member, one end of which is connected to the main body, and the other end is connected to the pressing piece;

The raised part is arranged on the peripheral side of the first opening, and the side wall of the raised part is provided with an air outlet;

The cover body is arranged on the end of the protrusion facing away from the first opening, and the cover body is provided with a through hole axially penetrating through.

The cover body of the explosion-proof valve of the utility model is provided with a through hole. On the one hand, the air-tightness detection tool can absorb the pressing piece through the through hole, and inflate the battery pack through the explosion-proof valve. After the inflation is completed, the cover can be closed and pressed It is only necessary to open a gas exchange channel on the battery pack, the process is simple, and it can ensure the airtightness of the battery pack after inflation; When the gas is ejected, some high-temperature electrolyte and high-temperature solid substances will also be ejected. These substances will remain near the first opening of the explosion-proof valve and affect the sealing of the tablet. They can be inserted into the cleaning device through the through hole to clean the residual substances. Clean, so as to ensure the tightness of the explosion-proof valve after pressure relief.

In addition, the utility model also provides a battery pack, which includes the above-mentioned explosion-proof valve.

Description of drawings

Fig. 1 is the structural representation of explosion-proof valve in the embodiment;

Fig. 2 is the exploded view of explosion-proof valve in the embodiment;

Fig. 3 is the structural representation of the explosion-proof valve without cover body;

Fig. 4 is a structural schematic diagram of the explosion-proof valve main body and the raised part;

5 is a schematic structural diagram of a battery pack;

Fig. 6 is a cross-sectional view of the explosion-proof valve installed on the battery pack.

Among them, the reference signs have the following meanings:

1. Main body; 11. First opening; 12. Second opening; 13. Sleeve; 14. Connecting part; 15. First sealing ring; 16. Second sealing ring; 2. Pressing sheet; 3. Elastic part; 31. Connecting rod; 311. Boss; 32. Spring; 4. Raised part; 41. Air outlet; 5. Cover; 51. Through hole.

Detailed ways

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying No device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used in the description of the utility model herein is only for the purpose of describing specific embodiments, and is not intended to limit the utility model.

Referring to Fig. 1, this embodiment discloses an explosion-proof valve, referring to Fig. 5, this embodiment also discloses a battery pack, the battery pack includes a box body, a base plate, a case cover, a battery pack and an explosion-proof valve, a base plate and a case cover Relatively arranged, the bottom plate is located at the bottom of the box body, the box cover is located at the top of the box body, the battery pack is arranged in the box body, and the explosion-proof valve is arranged on the side wall of the box body and communicates with the inside of the battery pack.

Referring to Fig. 1 and Fig. 2, the explosion-proof valve includes a main body 1, a pressing piece 2, an elastic member 3, a raised portion 4 and a cover body 5, and the two opposing end faces of the main body 1 with the largest surface areas are respectively provided with openings, which are the first openings respectively. 11 and the second opening 12 , the first opening 11 and the second opening 12 are oppositely arranged and communicated with each other, so that the main body 1 is a structure with openings at both ends and a hollow interior. In this embodiment, the second opening 12 is set close to the side wall of the battery pack box, and the first opening 11 is set away from the side wall of the battery pack box. The pressing piece 2 covers the first opening 11 , and the pressing piece 2 is connected to the main body 1 through the elastic member 3 . The raised part 4 is provided on the end surface of the main body 1 provided with the first opening 11 and protrudes away from the main body 1, the raised part 4 is arranged around the peripheral side of the first opening 11, and the raised part 4 is located on the outer periphery of the pressing piece 2, A gas outlet 41 is opened on the side wall of the protruding portion 4 to discharge the high-temperature gas in the battery pack through the gas outlet 41 . The cover body 5 is provided on the end of the raised portion 4 away from the first opening 11 , and the cover body 5 is provided with a through hole 51 , and the through hole 51 penetrates the cover body 5 along the axial direction of the cover body 5 .

Specifically, a groove is provided at the top of the inner wall of the protruding portion 4 , and the edge of the cover body 5 is clamped in the groove, so as to realize the connection between the cover body 5 and the protruding portion 4 .

In the explosion-proof valve of this embodiment, since the raised portion 4 is provided with an air outlet 41, the high-temperature gas in the battery pack passes through the second opening 12 and the first opening 11 in sequence, and then punches through the pressure sheet 2, and then is discharged through the air outlet 41 in a directional manner. , avoiding the high-temperature gas spraying indiscriminately and damaging the objects near the battery pack. Moreover, the cover body 5 of the explosion-proof valve of the present embodiment is provided with a through hole 51. On the one hand, the air-tightness detection tool can pass through the through hole 51 to suck the pressing sheet 2, and inflate the battery pack through the explosion-proof valve. After the completion, the air tightness testing tool releases the pressing piece 2, and the pressing piece 2 covers the first opening 11 under the contraction force of the elastic member 3, and there is no need to open an additional gas exchange channel on the battery pack. The process is simple and can ensure The tightness of the battery pack after inflation; on the other hand, after the explosion-proof valve bursts due to excessive pressure in the battery pack, not only high-temperature gas will be ejected, but also some high-temperature electrolyte and high-temperature solid substances will be ejected. Residue near the first opening 11 of the explosion-proof valve affects the sealing of the pressing piece 2, and can be inserted into the cleaning device through the through hole 51 to clean the residual substances, so as to ensure the pressure of the pressing piece 2 to the first opening 11 after the explosion-proof valve is released. tightness.

Referring to FIG. 2 and FIG. 3 , the elastic member 3 is disposed at the second opening 12 , and one end of the elastic member 3 passes through the second opening 12 and the first opening 11 in sequence and connects with the pressing piece 2 . Specifically, the main body 1 is provided with a connecting portion 14 and a sleeve 13 with both ends open and hollow inside. The elastic member 3 is arranged in the sleeve pipe 13, the elastic member 3 includes a connecting rod 31 and a spring 32, one end of the connecting rod 31 is connected with the connecting portion 14, and there is a gap between the outer wall of the connecting rod 31 and the inner wall of the sleeve pipe 13, so as to The high-temperature gas in the battery pack can reach the second opening 12 and the first opening 11 sequentially from the gap, and punch the pressing sheet 2 open. The spring 32 is sheathed on the connecting rod 31 along the axial direction of the connecting rod 31 , and one end of the spring 32 is fixedly connected to the pressing piece 2 , and the other end of the spring 32 is connected to the end of the connecting rod 31 away from the second opening 12 . When the pressure inside the battery pack is too high, the high-temperature gas in the battery pack will reach the second opening 12 and the first opening 11 in turn through the gap, and punch the pressing piece 2, and the spring 32 will be stretched. At this time, the pressing piece 2 is far away from the first opening. Opening 11 , the high-temperature gas rushes out from between the pressing piece 2 and the first opening 11 , and then is directionally discharged through the gas outlet 41 on the side wall of the raised portion 4 . After the pressure release in the battery pack is completed, the pressing piece 2 no longer bears the impact of the high-temperature gas, and the spring 32 rebounds to pull the pressing piece 2 to cover the first opening 11, thereby realizing the sealing of the battery pack.

An end of the connecting rod 31 away from the second opening 12 is provided with a boss 311 protruding radially thereof, and the boss 311 can prevent the spring 32 from falling off from the connecting rod 31 .

Further, referring to FIG. 2 and FIG. 4 , the connection between the elastic member 3 and the pressing piece 2 is located in the central area of the pressing piece 2 . Specifically, the connecting portion 14 is arranged at the central area of the second opening 12 , and after the spring 32 is sheathed on the connecting rod 31 , one end thereof is connected with the central area of the pressing piece 2 . When the spring 32 rebounds and pulls the pressing piece 2 to cover the first opening 11 , the edge of the pressing piece 2 is evenly stressed, thereby ensuring that the pressing piece 2 can seal the first opening 11 .

Furthermore, the position of the through hole 51 corresponds to the position of the spring 32 , that is, the through hole 51 is opened in the central area of the cover body 5 . When the high-temperature gas in the battery pack breaks away the pressure piece 2, the pressure piece 2 is likely to be impacted to the bottom surface of the cover body 5. At this time, the spring 32 bears a large tensile force, which easily causes the pressure piece 2 to Deformation, the connection between the spring 32 and the pressing piece 2 is set in the central area of the pressing piece 2, and the position of the through hole 51 corresponds to the position of the spring 32. On the one hand, the impact force of the spring 32 can be buffered; On the other hand, even if the pressing sheet 2 is deformed, its deformed position is in the central area, which basically has no effect on the edge of the pressing sheet 2, ensuring that the pressing sheet 2 can seal the first opening 11 after the battery pack is depressurized.

In addition, this embodiment also has a sealing structure. Referring to Fig. 4, a first sealing ring 15 is provided on the peripheral side of the first opening 11 of the main body 1, and the first sealing ring 15 is located inside the raised portion 4, and the pressing piece 2 covers the first opening 11 and covers the first sealing ring. Ring 15 , so that the sealing connection between the pressing piece 2 and the first opening 11 is realized through the first sealing ring 15 .

Referring to Figure 2 and Figure 6, when the explosion-proof valve is installed on the side wall of the battery pack box, the sleeve 13 penetrates into the side wall of the box body and communicates with the inside of the battery pack, and the end surface of the main body 1 provided with the second opening 12 It is connected to the side wall of the box body, and the end face is provided with a second sealing ring 16, and the second sealing ring 16 is located on the outer periphery of the second opening 12, thereby ensuring the tightness of the connection between the explosion-proof valve and the side wall of the battery pack box body.

It should be noted that multiple air outlets 41 can be provided at intervals, and the number and positions can be set according to actual needs. The battery pack is often used as the power source of the new energy vehicle, and it is generally installed at the bottom of the new energy vehicle. In order to avoid the impact of the high-temperature gas emitted by the battery pack on the new energy vehicle, there are two air outlets 41 in this embodiment. The two air outlets 41 are both set towards the bottom plate of the battery pack, so as to spray the high-temperature gas in the battery pack to the ground.

The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims (10)

1. An explosion-proof valve, characterized in that, comprising: a main body comprising a first opening and a second opening disposed on opposite end surfaces of the main body and communicating with each other; a pressing sheet covering the first opening; an elastic member, one end of which is connected to the main body, and the other end is connected to the pressing piece; a protruding part, which is arranged on the peripheral side of the first opening, and the side wall of the protruding part is provided with an air outlet; A cover body is provided on the end of the raised portion facing away from the first opening, and the cover body is provided with a through hole axially penetrating through. 2. The explosion-proof valve according to claim 1, wherein the position of the through hole corresponds to the position of the elastic member. 3. An explosion-proof valve according to claim 1 or 2, characterized in that: the connection between the elastic member and the pressing piece is located in the central area of the pressing piece. 4. An explosion-proof valve according to claim 3, characterized in that: the elastic member is arranged at the second opening, and one end of the elastic member extends to the first opening and is connected to the first opening. The tabs are connected. 5. An explosion-proof valve according to claim 4, characterized in that: the main body further comprises a sleeve and a connecting part, the sleeve is arranged on the peripheral side of the connecting part, and the connecting part is arranged on the the second opening; The elastic member includes a connecting rod and a spring, the connecting rod is arranged in the sleeve, and one end thereof is connected to the connecting portion, the spring is sleeved on the connecting rod, and one end thereof is connected to the connecting portion. The above-mentioned compression piece is connected. 6. An explosion-proof valve according to claim 5, characterized in that: the end of the connecting rod away from the connecting part is provided with a radially protruding boss. 7. An explosion-proof valve according to claim 1, characterized in that: a first sealing ring is provided around the first opening, and the pressure sheet cover is provided on the first sealing ring. 8. A battery pack, characterized by comprising the explosion-proof valve according to any one of claims 1-7. 9. A battery pack according to claim 8, characterized in that: the battery pack includes a box body and a bottom plate at the bottom of the box body, the explosion-proof valve is installed on the side wall of the box body, and the The air outlet faces the bottom plate. 10 . The battery pack according to claim 9 , wherein the explosion-proof valve is sealed and connected to the side wall of the box through a second sealing ring. 11 .

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