Power battery alternating current varying current gradient heating method

Abstract

The invention relates to a power battery alternating current varying current gradient heating method. The method is characterized in that the alternating current excitation current amplitude is timely calculated and updated according to the temperature of an existing power battery packet, the external environment temperature, and the terminal voltage and other detection signals of power batteries, and is applied to two ends of every battery in order to guarantee that the terminal voltages of the batteries do not exceed limits and the current is positioned in the born current range allowed by the batteries, so the low-temperature working performances of the power batteries are improved. The heating method solves the problems of slow heating speed, poor effects, voltage exceeding limits in the heating process and affection of the life of the batteries of existing battery heating methods in low temperature environment, has the advantages of good effect, high robustness and good safety, and provides guarantee for the reliable running of the power batteries.

Description

technical field [0001] The invention relates to the field of power battery thermal management, in particular to a low-temperature heating method for a power battery. Background technique [0002] In a low temperature environment, it is necessary to preheat the battery in advance to increase the cold start temperature of the power battery and improve the working performance of the battery. [0003] At present, low-temperature heating is commonly used to solve the low-temperature problem of batteries. There are mainly external heating methods such as air heating, liquid cooling, and electric heating. However, these low-temperature external heating systems for vehicle batteries have low energy utilization and poor heating effects. After the battery is heated to the specified temperature within a certain period of time, a large heat loss is caused due to heat exchange between the battery and the external environment, heat radiation, etc. The control of the working environment te...

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Problems solved by technology

At present, the common internal heating methods mainly include alternating current heating method, but in the prior art, in the process of alternating current heating, the alternating current of single amplitude and frequency is used, without considering the safety performance of the battery, and it is impossible to effectively limit the voltage of the battery during the heating process , during the heating process, it is easy to cause the battery terminal voltage to exceed the limit, which will shorten the battery life.

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