Low-temperature auxiliary heating apparatus for power battery based on phase change heat storage

Abstract

The invention relates to an apparatus for heating a power battery under a low temperature condition. The apparatus comprises a power battery cooling liquid plate, a solid-liquid phase change heat storage device, a temperature control module and a flow control module. The heating apparatus heating the power battery under the low temperature condition includes the power battery cooling liquid plate,a pipeline, a three-way valve, the solid-liquid phase change heat storage device, a temperature sensor and a water pump. The device recovers a part of waste heat dissipated by the power battery through utilizing the phase change latent heat of a phase change material during normal working of the power battery, and stores the waste heat in the phase change material. When the power battery needs tobe preheated under the low temperature condition, the heat stored in the phase change material can be transferred to the power battery through a cooling liquid to make the temperature of the power battery reach a normal working temperature. The device has the advantages of simple structure, high safety and reliability, and easiness in realization in a power battery thermal management system.

Description

technical field [0001] The present invention designs a power battery low-temperature auxiliary heating device using phase change heat storage, which can use phase change material heat storage technology to recover part of the waste heat when the power battery is in normal operation, and use the recovered waste heat to heat the battery under low temperature conditions. Preheat to allow it to reach normal operating temperature. technical background [0002] With the increasing energy problems and environmental pollution problems, new energy vehicles, as a substitute for traditional fuel vehicles, are receiving more and more attention. Among them, electric vehicles powered by lithium-ion batteries have become Research hotspots of manufacturers and scientific research institutions. Similar to traditional engines, lithium-ion power batteries emit heat during operation. If there is no suitable thermal management solution, thermal runaway will easily occur, causing the power batte...

AI Technical Summary

Problems solved by technology

Studies have shown that when a power battery is discharged below 0 degrees Celsius, its internal resistance will increase sharply, thereby affecting battery life

At present, the solution for power battery heating under low temperature conditions mainly relies on arranging electric heating wires and heating films on the surface of the battery, and heating through active heating. This heating method needs to consume a certain amount of electric energy.

For electric vehicles, the on-board power battery is the only power source, so if the active heating method is adopted, the on-board power supply or the backup battery pack is required to provide electric energy, which will inevitably reduce the mileage of electric vehicles

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