Power battery heat management method and device

Abstract

The invention discloses a power battery heat management method and a device. The method comprises the following steps of: storing a power battery into a device formed by a box body and an upper cover; fully distributing phase-change materials in a closed cavity in the box body at the periphery of the battery; absorbing heat generated by a use process of the battery according to the change of a crystal phase of the phase-change materials in a surrounding temperature changing process; enabling the battery to work under a relative constant-temperature environment due to the heat insulation property of the phase change materials so as to effectively realize the effect of heat management in a working process of the battery, alleviate the influences on a battery performance by heat change caused by the battery or the outside, and greatly improve the use performance of the battery.

Description

technical field [0001] The invention relates to the manufacture and application of a power battery used in new energy vehicles, in particular to a power battery heat management method and device. Background technique [0002] In recent years, green energy has been vigorously advocated around the world. The development of new energy vehicles has been strongly supported by governments of various countries, and the development of power batteries is also extremely hot. However, due to the technical limitations of the current battery, the use of power batteries is affected by temperature factors that cause performance degradation. For example, the battery charge and discharge capacity is greatly reduced under low temperature conditions; battery life. How to choose a thermal management method to improve the performance of the battery is a topic that needs to be studied. [0003] At present, the thermal management methods of batteries are selected in different ways according to d...

AI Technical Summary

Problems solved by technology

In the field of backup power supply, a number of backup power supplies are generally assembled in a closed warehouse, and a cooling unit and a heating unit are installed somewhere in the warehouse to heat and cool the internal space of the battery pack. This method has a large space for thermal management. The thermal management unit consumes a lot of power, and the effect is not obvious, so it is unrealistic to apply to the field of new energy vehicles

In the field of power supply, there is no battery thermal management on micro-hybrid and light-hybrid vehicles, which greatly reduces the performance of the battery; most of the full-hybrid and pure electric vehicles use the whole group of air-cooled and liquid-cooled methods, which often cannot take into account each battery. The liquid cooling method has strict requirements on the sealing of the fluid channel. Once leakage occurs, there will be a greater safety hazard

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