A system and control method for realizing inerting fire prevention and thermal management optimization of vehicle battery pack

By using the air nitrogen-oxygen separation membrane group in the battery pack of new energy vehicles to generate nitrogen-rich gas, the problem of thermal runaway and oxygen caused by the battery pack under harsh conditions is solved, oxygen isolation and thermal management optimization is achieved, and safety and driving comfort are improved.

CN113147312BActive Publication Date: 2025-03-18XIAN PENGTAI AVIATION POWER TECH CO LTD
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Patent Information

Application Number
CN202110217203.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-02-26
Publication Date
2025-03-18
Estimated Expiration
2041-02-26

AI Technical Summary

Technical Problem

In harsh operating conditions, new energy vehicle battery packs are prone to extreme dangerous states such as thermal runaway and oxygen caused by the existence of fire, combustion, and explosion. The existing thermal management system cannot effectively isolate oxygen or achieve thermal management optimization in small spaces.

Method used

The air nitrogen-oxygen separation membrane group is used to generate nitrogen-rich gas, which is connected to the liquid-cooled or direct-cooled system of the battery pack through the pipeline, and the internal space of the battery pack is actively flushed to reduce the oxygen content, and the heat transfer efficiency is enhanced through the flow of pure nitrogen, so as to achieve oxygen isolation and thermal management optimization.

Benefits of technology

It effectively reduces the oxygen content inside the battery pack to prevent fires, and through optimized thermal management, it improves temperature uniformity, reduces the cause of fires, improves the oxygen-rich environment in the passenger space, and enhances driving comfort and safety.

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Abstract

The present invention discloses a system for realizing inerting fire prevention and thermal management optimization of a vehicle-mounted battery pack. The present invention also discloses a control method for a fresh air system for realizing an oxygen-rich environment in a passenger space of a new energy vehicle. When the vehicle-mounted power battery pack is in an abnormal state, the vehicle-mounted inerting integrated control unit monitors the data changes of the pressure and oxygen concentration in a certain part inside the vehicle-mounted power battery pack, and then controls the DC variable frequency air compressor and large and small flow solenoid valves to maintain the temperature, pressure and oxygen concentration inside the battery pack in a normal and safe state; after the gas passes through the solenoid valve at the air inlet of the vehicle-mounted battery pack, the nitrogen-rich gas is distributed and injected into the vehicle-mounted power battery pack through the nitrogen-rich gas outlet pipeline of the original liquid cooling or direct cooling thermal management system. The present method can realize the oxygen isolation and fire prevention in the internal space of the current power battery pack, and at the same time improve and enhance the temperature uniformity control efficiency of the current battery pack liquid cooling or direct cooling thermal management in a local micro space.
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