A battery pack explosion-proof valve and battery pack

Abstract

The invention discloses a battery pack explosion-proof valve and a battery pack, wherein the battery pack explosion-proof valve comprises a body, two limit brackets, a thimble, a support, an elastic member and a breathable film, and a vent hole is arranged on the top wall of the body, and two Two limit brackets are arranged on the body at intervals, the thimble is set on the upper limit bracket, the support is installed on the lower limit bracket, and the support is used to support the thimble, and the elastic member is sleeved on the thimble. The two ends of the elastic member respectively abut against the support and the upper limit bracket, and the air-permeable membrane is connected to the body and is located between the thimble and the top wall of the body. The battery pack explosion-proof valve adopts an integrated structure of elastic parts and thimbles. When thermal runaway is triggered, the movement of the elastic parts pushes the thimble to pierce the gas-permeable membrane, which meets the needs of different blasting pressures. After the gas-permeable membrane is damaged, it can be directly connected to the outside to achieve greater The air permeability ensures the rapid leakage of the gas inside the battery pack and improves the safety of the battery pack.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an explosion-proof valve for a battery pack and a battery pack. Background technique [0002] With the continuous development of electric vehicles, the design of low-cost battery packs has become the focus of the research and development of major battery factories, but the premise of low cost must be the safety of the battery pack. There are two kinds of spring valve and thimble valve. The opening pressure of the spring valve is low, but the spring cannot quickly open to the maximum stroke after blasting, and the air flow after blasting is small. The bursting pressure of the thimble valve cannot be compared with the bursting pressure of the spring valve. Under the condition of thermal runaway, the explosion-proof membrane is easily pierced by the thimble, causing the seal to fail. Contents of the invention [0003] The first purpose of the present invention is to propose an...

AI Technical Summary

Problems solved by technology

The opening pressure of the spring valve is low, but the spring cannot quickly open to the maximum stroke after blasting, and the air flow after blasting is small. The bursting pressure of the thimble valve cannot be compared with the bursting pressure of the spring valve. Under the condition of thermal runaway, the explosion-proof membrane is easily pierced by the thimble, resulting in seal failure

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