Battery pack pressure relief protection system, design method thereof and vehicle

Abstract

The invention discloses a battery pack pressure relief protection system, a design method thereof and a vehicle, and relates to the technical field of batteries. The battery pack pressure relief protection system comprises a battery pack box body, a fireproof heat insulation wall, a pressure relief flame path and a gas collecting tank. The battery pack box body is used for accommodating a batterymodule, the fireproof heat insulation wall is arranged in the battery pack box body, and the fireproof heat insulation wall divides the interior of the battery pack box body into a plurality of mutually independent isolation areas; one-way pressure release valves are arranged on the battery pack box body at the two ends of all isolation areas, the gas collecting tank is laid above an explosion-proof exhaust port of the battery module, and the two ends of the gas collecting tank are communicated with the one-way pressure release valves respectively; the pressure relief flame path and the one-way pressure relief valves are located at the same end of the battery pack box body, and the one-way pressure relief valves are used for collecting air flows in the gas collecting tank into the pressurerelief flame path. Through the processes of gas collection guide, one-way pressure relief and flame path collection, the flowing direction of high-temperature gas flame can be well controlled, and the safety of the battery pack is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery pack pressure relief protection system, a design method thereof, and a vehicle. Background technique [0002] As a key component of electric vehicle energy storage, the power battery system's safety performance directly affects the safety of the entire electric vehicle. With the gradual increase in the number of electric vehicles, fire incidents caused by mechanical, electrical, heating or management system failures also occur frequently. The power battery system is a high-energy chemical system. During the process of thermal runaway, various side reactions will be triggered inside the battery cell, forming a high-temperature gas flame (high-temperature and high-pressure gas, or being ignited). At the same time, due to the limited space structure of the battery system, The module layout is compact, the wiring harnesses are stacked, and the thermal runaway high-temper...

AI Technical Summary

Problems solved by technology

The power battery system is a high-energy chemical system. During the process of thermal runaway, various side reactions will be triggered inside the battery cell, forming a high-temperature gas flame (high-temperature and high-pressure gas, or being ignited). At the same time, due to the limited space structure of the battery system, The module layout is compact, the wiring harnesses are stacked, and the thermal runaway high-temperature gas flame is difficult to be discharged to the outside of the box in a short period of time. A large amount of heat retention makes the normal battery cells also suffer thermal shock, which eventually leads to thermal spread of the entire battery system, causing damage to vehicles or personnel. Great damage

Images