Battery pack temperature control system and method

Abstract

The invention relates to the technical field of electric vehicles, in particular to a battery pack temperature control system and method. The battery pack temperature control system comprises an expansion water tank, a radiator and a fan assembly, as well as a main pipe for connecting a water pump, a fuel heater, temperature sensors and a plurality of battery pack liquid-cooling plates; the expansion water tank is communicated with the radiator and a fan assembly water inlet. The battery pack temperature control system also comprises a water path distributor and a water path collector valve; the main pipe is divided into a plurality of branch pipes through the water path distributor; the branch pipes are gathered to the main pipe through the water path collector valve; the battery pack liquid-cooling plates are arranged on the branch pipes in parallel; the temperature sensors include temperature sensor TS1 arranged between the downstream of the water pump and the upstream of the waterpath distributor and temperature sensor TS2 arranged between the upstream of the water pump and the downstream of the water path collector valve. Temperature differences of the battery packs are decreased, measuring precision is improved, the battery pack target temperature is more accurate to calculate, and overall life of each battery is extended.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery pack temperature control system and method. Background technique [0002] At present, new energy vehicles have become a major trend in the development of the global automotive industry. As a big country in the field of new energy vehicles, it is an indisputable fact that new energy vehicles are developing rapidly in the south of my country and continue to slump in the north. The reason is that when the temperature of most power batteries is higher than 40°C and lower than 0°C, the charging and discharging performance, capacity and life of the battery will be affected, and the battery box does not have an insulation layer for heat dissipation. In winter, if the outdoor temperature is -25°C or even lower, it will seriously affect the charging and discharging effect of the power battery. [0003] In order to solve the above problems, one is to study new battery...

AI Technical Summary

Problems solved by technology

Most of the existing electric vehicles adopt the method of preheating and heat preservation to improve the environmental adaptability of the battery. In the circulation system of the existing electric vehicles, each battery pack unit is connected in series on the main pipe. Because the pipe is too long, the temperature loss is relatively large. , resulting in a large temperature difference between different battery packs

And when the battery pack is heated, it cannot guarantee that the temperature reaches the target temperature at the same time

This leads to inaccurate calculation of the target temperature, and after the heating is completed, some battery packs exceed the target temperature, while some battery packs have not yet reached the target temperature, which will affect the service life of the battery pack

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