Battery pack thermal safety management and control system

Abstract

The invention provides a battery pack thermal safety management and control system and relates to the field of battery pack thermal management. The system comprises a battery pack, a nozzle, a flow channel, a connecting hole, a moving joint, a multi-way control valve, a gas pipeline, a gas detecting device, a getter pump, a check valve, and an infusion tube, a control valve, and a low-temperaturegasification liquid supply device. Polling recognition and detection are carried out on exhaust of an overheated battery or a battery module in the battery pack through a multi-zone bit overheated battery gas generation polling inspection and thermal combustion suppression integrated structure and a thermal safety management and control method; emergency cooling is implemented to achieve dual function of overheating detection and thermal combustion suppression; the thermal safety management and control ability of battery thermal management is improved, and the safety of the electric vehicle battery system is further ensured.

Description

technical field [0001] The invention relates to a battery pack thermal management system and thermal safety application technology. Background technique [0002] With the increasingly serious global energy and environmental problems, countries all over the world are actively seeking solutions. Electric vehicles have become the development trend of the automobile industry in various countries because they conform to the social development trend of energy saving and emission reduction, and also conform to the development concept of environmental protection. Importantly, batteries are widely used in new energy vehicles due to their high energy density, simple system and environmental friendliness. Temperature is an important factor affecting batteries. Too low temperature will increase the internal resistance of the battery, reduce the charge and discharge capacity, and reduce the service life of the battery; too high temperature will increase the side reactions in the battery...

AI Technical Summary

Problems solved by technology

Too low temperature will increase the internal resistance of the battery, reduce the charge and discharge capacity, and reduce the service life of the battery; too high temperature will increase the side reactions in the battery pack, decompose the SEI film, and generate CO 2 、H 2 , CO, CH 4 And other gases, reduce the cycle life of the battery, reduce the safety of the battery, and even cause the battery to burn and explode

[0003] In the technologies widely used now, the thermal management schemes of battery packs usually adopt air cooling, coolant liquid cooling, refrigerant direct cooling and other schemes. These thermal management schemes usually control the temperature of the entire battery pack and cannot realize The local thermal management of the battery at the battery module level, the implementation of thermal management measures is not targeted. When the batteries in different locations in the battery pack are overheated, the positioning and ultra-cooling and rapid thermal management measures are particularly important.

In addition, in the case of abnormal battery overheating in a small local area of ​​the battery pack, thermal management of the battery pack as a whole is not conducive to saving energy

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