Constant temperature system of power battery

Abstract

The invention discloses a constant temperature system of a power battery. The constant temperature system comprises a sealed container, a controller, a first circulating branch, and a vacuum circulating loop formed by a cooling branch and a second circulating branch; when the temperature of the power battery is lower than the maximum working temperature, the temperature of a cooling liquid in a temperature adjusting container is adjusted into a normal working temperature range of the power battery and then the cooling liquid flows through the first circulating branch, the sealed container and the second circulating branch and flows back to the temperature adjusting container to achieve a temperature balance of the power battery; and when the temperature of the power battery is higher than the maximum working temperature, the cooling liquid in the temperature adjusting container at least flows through the cooling branch, the sealed container and the second circulating branch and flows back to the temperature adjusting container to achieve the temperature balance of the power battery. According to the constant temperature system of the power battery, cooling, heating and a constant temperature of the power battery are achieved; the problems that the power battery is low in low-temperature charging rate and discharging power cannot meet the requirements of a motor vehicle are solved; and meanwhile, normal operation in extremely cold weather conditions can be ensured.

Description

technical field [0001] The invention relates to the technical field of automotive power batteries, in particular to a constant temperature system and method for power batteries. Background technique [0002] At present, due to the energy crisis and the problems caused by air pollution, people are eager to develop new energy that can fully replace traditional petroleum energy. In this context, the power battery should be born. The use of power batteries in automobiles to replace conventional oil and other energy sources can not only alleviate the energy crisis, but also reduce environmental pollution because the power batteries themselves are non-polluting. [0003] With the rapid development of electric vehicles, the performance of power batteries has become the key to the popularization of electric vehicles. However, the power battery is more sensitive to the ambient temperature, which limits its own development and popularization. Take the lithium-ion power battery in t...

AI Technical Summary

Problems solved by technology

[0006] First, when the battery temperature exceeds 40°C, its charging and discharging efficiency will be greatly reduced, and the battery and motor will continue to release heat when they are working, resulting in a continuous rise in battery temperature in high temperature weather

[0007] Second, when the battery temperature is lower than 5°C, its discharge power cannot meet the normal working requirements of the motor, resulting in insufficient power of the motor, so that the electric vehicle cannot obtain better power performance

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