Automatic thermal management method for battery modules

Abstract

The invention relates to an automatic heat management method of a battery module. The automatic heat management method comprises two types of judgment methods for judging how to control a draught fan. When the discharging time or the charging time of the battery module exceed pre-set time under the condition that the discharging rate or the charging rate of the battery module is equal to or more than one pre-set rate or the temperature rising of the battery module within a pre-set judgment period is more than or equal to pre-set temperature, the first judgment method is started or switched; otherwise, the second judgment method is started or switched. According to the automatic heat management method of the battery module, provided by the invention, a fan can be automatically started / stopped and an air speed can be adjusted according to the judgment of conditions including working conditions of the battery module, the temperature rising, the continuous charging rate and the like; the temperature environment of battery operation is controlled and the safety of the battery module is guaranteed; the battery module has the optimal performance and service life.

Description

technical field [0001] The invention relates to charge and discharge management of a power battery module, in particular to an automatic thermal management method for a battery module. Background technique [0002] The power battery module will generate a lot of heat during work, so the heat dissipation system is required to dissipate heat in time, otherwise it cannot maintain normal work and shorten the service life of the battery module. Existing heat dissipation methods for battery modules mainly include liquid cooling and air cooling. Liquid cooling pipes are complex in structure, large in size, and have potential safety hazards such as liquid leakage and pipe falling off. Therefore, most battery modules use air cooling. A cooling method. The cooling fan used in the existing air-cooling heat dissipation system is basically a constant power driven fan for cooling. The fan cannot be adjusted in a timely manner according to the actual situation, and the wind speed cannot b...

AI Technical Summary

Problems solved by technology

[0002] The power battery module will generate a lot of heat during work, so the heat dissipation system is required to dissipate heat in time, otherwise it cannot maintain normal work and shorten the service life of the battery module

Existing heat dissipation methods for battery modules mainly include liquid cooling and air cooling. Liquid cooling pipes are complex in structure, large in size, and have potential safety hazards such as liquid leakage and pipe falling off. Therefore, most battery modules use air cooling. A cooling method

The heat dissipation fans used in the existing air-cooled heat dissipation systems are basically constant power driven fans for heat dissipation. The fans cannot be adjusted in a timely manner according to the actual situation, and the wind speed cannot be automatically adjusted. There are problems such as low energy utilization rate and inability to dissipate heat effectively in a timely manner.

Now there is also a wind-driven grading heat dissipation system. Although it can control the upper and lower limits of the temperature to a certain extent, the heat dissipation operation is delayed, resulting in less time for the battery module to be in a safe and reasonable working environment, and it cannot automatically control the temperature environment in which the battery operates. , which is not conducive to the best performance of the battery module and affects the service life of the battery

In addition, when the temperature changes frequently near the temperature point where the air-cooling system is turned on / off, it will lead to frequent operations of turning on / off the air-cooling system, which may cause system failure and the safety of the battery module cannot be guaranteed

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