CN-121983764-A - Liquid leakage valve, battery pack and vehicle

CN121983764ACN 121983764 ACN121983764 ACN 121983764ACN-121983764-A

Abstract

The invention discloses a liquid leakage valve, a battery pack and a vehicle. The mounting plate is provided with a mounting hole and at least one weeping hole. The bolt comprises a screw cap and a screw rod, one side of the screw cap, which is close to the screw rod, is provided with an annular groove, and the outer side of the annular groove is provided with an annular sealing groove. The nut is fixedly connected with the mounting plate, and the mounting hole is coaxial with the nut. The sealing ring is matched with the annular sealing groove. The screw rod of bolt passes the mounting hole and is connected with the nut screw thread, and the sealing washer contacts with the lower terminal surface of mounting panel, and the weeping hole sets up the inboard with the sealing washer contact point on the mounting panel. A cavity is formed between the outer surface of the mounting plate of the liquid leakage valve and the screw cap, and a small amount of liquid in the bag can be automatically collected without disassembling the screw bolts. The leakage, condensation and the like in the battery pack can be prevented from being discharged, and safety risks such as short circuit and the like are avoided.

Inventors

DU XUEZE
PI LIN
WANG YING
CHEN XUEDAN
JIN YONGZHONG
SHEN JIALE
ZHANG JIAYAN
LUO YUXIU

Assignees

四川轻化工大学

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (7)

1. A drain valve applied to a battery pack case (1), characterized by comprising: a mounting plate (2) provided with a mounting hole (21) and at least one weeping hole (22); The bolt (3) comprises a screw cap (31) and a screw rod (32), wherein an annular groove (33) is formed in one side, close to the screw rod (32), of the screw cap (31), and an annular sealing groove (34) is formed in the outer side of the annular groove (33) of the screw cap (31); A nut (4) fixedly connected with the mounting plate (2), the mounting hole (21) being coaxial with the nut (4), and A sealing ring (5) which is matched with the annular sealing groove (34); The screw rod (32) of the bolt (3) penetrates through the mounting hole (21) to be in threaded connection with the nut (4), the sealing ring (5) is in contact with the lower end face of the mounting plate (2), and the liquid leakage hole (22) is formed in the inner side of the contact point between the mounting plate (2) and the sealing ring (5).
2. The drain valve according to claim 1, wherein the mounting plate (2) is integrated with the battery pack case (1), the mounting plate (2) is convex upward in a boss shape, and the mounting hole (21) is located at the center of the boss.
3. The weeping valve of claim 1, wherein the nut (4) is stepped, and the bottom of the nut (4) is fixedly connected with the mounting plate (2) by welding.
4. The leakage valve according to claim 1, wherein the edge of the lower end face of the nut (31) is an arc transition face (35), and a driving groove (36) is arranged in the center of the lower end face.
5. The liquid leakage valve according to claim 1, wherein the liquid leakage hole (22) is covered with a unidirectional liquid-permeable film.
6. A battery pack characterized by comprising a housing (1) and the drain valve according to any one of claims 1-5, said drain valve being arranged at the bottom of said housing (1).
7. A vehicle comprising the battery pack according to claim 6.

Description

Liquid leakage valve, battery pack and vehicle Technical Field The invention belongs to the technical field of new energy batteries, and particularly relates to a liquid leakage valve, a battery pack and a vehicle. Background At present, the safety and maintainability problems of a battery pack of a new energy automobile are more and more widely concerned, a liquid leakage valve is additionally arranged at the bottom of the battery pack, and liquid in the battery pack is timely discharged, so that the risks of short circuit, air leakage and the like of the battery pack are reduced, and the design direction of thinking of a plurality of battery factories is formed. The traditional battery pack lower shell is not provided with a liquid leakage valve, so that the battery pack can not be maintained after liquid leakage or condensation is generated, and the battery pack lower shell has very high safety risk and is challenged by a host factory and a consumer. The design of part of the battery pack adopts a safer scheme, namely, an inner projection welding stud is welded with a metal lower shell, and an outer bolt is connected to achieve the purposes of airtight and maintainability. Although the liquid in the battery pack can be discharged through the liquid leakage valve by adopting the scheme, because the projection welding stud has a certain height, the accumulated liquid can be discharged only after the water level in the battery pack is lower than the height of the projection welding stud, so that a part of liquid can not be discharged all the time after the liquid leakage or condensation occurs in the battery pack. And if water or liquid is accumulated in the position of the projection welding stud for a long time, the interface between the projection welding stud and the lower shell, even the interface between the projection welding stud and the nut, is easy to rust, so that the connection or sealing is invalid. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a leakage valve, a battery pack and a vehicle, wherein the leakage valve can be used for conveniently discharging battery pack leakage in time. In order to solve the technical problems, the invention adopts the following technical scheme: the application provides a liquid leakage valve which is applied to a battery pack shell. The mounting plate is provided with a mounting hole and at least one weeping hole. The bolt comprises a nut and a screw rod, wherein an annular groove is formed in one side, close to the screw rod, of the nut, and an annular sealing groove is formed in the outer side of the annular groove. The nut is fixedly connected with the mounting plate, and the mounting hole is coaxial with the nut. The sealing ring is matched with the annular sealing groove. The screw rod of the bolt penetrates through the mounting hole to be connected with the nut in a threaded mode, the sealing ring is in contact with the lower end face of the mounting plate, and the liquid leakage hole is formed in the inner side of the contact point of the mounting plate and the sealing ring. Preferably, the mounting plate and the battery pack shell are integrated, the mounting plate protrudes upwards to form a boss, and the mounting hole is located in the center of the boss. Preferably, the nut is stepped, and the bottom of the nut is fixedly connected with the mounting plate through welding. Preferably, a driving groove is formed in the center of the lower end face of the nut, the edge of the lower end face is an arc transition face, the arc transition face is equivalent to a design process R angle, and the deformation can be prevented by buffering through changing the stress direction during collision. Preferably, the liquid leakage hole (22) is covered with a unidirectional liquid permeable film. The application also provides a battery pack, which comprises a shell and the liquid leakage valve, wherein the liquid leakage valve is arranged at the bottom of the shell. The application also provides a vehicle comprising the battery pack. The invention has the beneficial effects that the screw cap of the liquid leakage valve screw bolt is provided with an annular groove at one side close to the screw rod, so that a cavity is formed between the outer surface of the mounting plate and the screw cap, and liquid in the battery pack enters the cavity through the liquid leakage hole, thereby achieving the purpose of automatically collecting a small amount of liquid in the battery pack without disassembling the screw bolt, and the screw cap is provided with an annular sealing groove, so that the sealing function can be realized in a sealing ring in the groove mode, and leakage liquid is prevented from seeping out of the liquid leakage valve. The bottom plate of the battery pack shell is provided with the liquid leakage valve, so that liquid leakage, condensation and the like in the battery pack can be prevented from being dischar