Thermal management system of power battery

Abstract

The invention relates to a thermal management system of a power battery, and belongs to a component of a battery management system. The thermal management system of the power battery mainly consists of a battery box, a heat pipe, a liquid flow pipe, a liquid box, a semiconductor heating / refrigerating element, a liquid circulating pump, a battery control unit, a temperature sensor, a radiator and a fan. The radiator and the fan are installed outside the battery box, the battery box, the heat pipe, the liquid flow pipe, the liquid box, the semiconductor heating / refrigerating element, the liquid circulating pump, the battery control unit and the temperature sensor are installed in the battery box and organically combined with a battery module. The heat pipe is inserted into the battery module. The heat pipe is compactly attached to the battery module and the liquid flow plate above the battery module. The liquid flow plate is internally provided with a liquid circulating pipeline connected with the liquid circulating pump which is further connected with the liquid box filled with a circulating liquid. The semiconductor heating / refrigerating element is contacted with the liquid box and attached to the radiator. The battery box is further provided with the temperature sensor connected with battery control unit which controls the liquid circulating pump, the semiconductor heating / refrigerating element and the fan to work. The thermal management system of the power battery provided by the utility model is reasonable in structure and can quickly heat and cool.

Description

technical field [0001] The invention relates to a thermal management system of a power battery, which belongs to a component of the power battery management system. Background technique [0002] At present, the world's energy crisis and environmental pollution are becoming more and more serious. The disposable energy is decreasing and the price of crude oil is rising. All countries are stepping up the research and development of new energy vehicles. The future focus on the development of transportation. The power battery is the energy carrier driven by pure electric vehicles and hybrid vehicles. In order to meet the requirements of fast charging and driving range, as well as the vehicle performance under climbing, acceleration and other working conditions, the power battery must have high power output and large capacity. In order to ensure the high capacity and high power of the power battery, a large number of single power batteries are usually connected in parallel or in...

AI Technical Summary

Problems solved by technology

[0004] Although the above battery thermal management system can achieve heat dissipation effect, the design has the following disadvantages: when the battery temperature fluctuates rapidly in the fan cooling mode, it is difficult to adjust the temperature balance in a short time, and due to the wind resistance of various places in the battery box Different battery modules lead to uneven heat dissipation and large temperature differences, and it is easy for dust to enter the battery box; the use of automotive air conditioners to cool and heat batteries relies heavily on automotive air conditioners, and the battery thermal management system cannot be independent When the vehicle’s air conditioner fails, it may cause the battery thermal management system to run out of control; the liquid circulation is used to heat or cool the battery, and the circulation pipes between the battery modules are prone to rupture when the battery is collided or squeezed, resulting in battery failure. The risk of short circuit; the heat dissipation method of inserting heat pipes between battery modules is simple in structure, but it is still affected by the ambient temperature. If the external ambient temperature is high, the heat pipe cannot reduce the battery temperature below the ambient temperature, and the battery itself still has high heat. Danger

Therefore, the existing battery thermal management system cannot realize the rapid heating of the battery under low temperature conditions, the active cooling under high temperature conditions, independent operation and the adjustment function of keeping the battery temperature uniform

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