A self-heating circuit for a power battery

Abstract

The invention discloses a self-heating circuit of a power battery, comprising: an insulating shell, a soft pack power battery, a heating plate, a BMS system and a control circuit. The self-heating circuit of a power battery proposed by the present invention, when the temperature of the soft-pack power battery is too low, the heating sheet is powered by the soft-pack power battery, so that the heating sheet generates heat to supplement heat to the soft-pack power battery, and the soft-pack power is realized. The self-regulation of battery temperature ensures that the battery can be charged and discharged normally at low temperature, improves the electrical performance of the battery at low temperature, and improves the cruising range of electric vehicles in cold environments.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a self-heating circuit of a power battery. Background technique [0002] With the development of society, people pay more and more attention to environmental issues, and new energy vehicle technology is recognized by more and more consumers. It is expected that new energy vehicles will gradually replace traditional vehicles in 2020. As the demand for new energy vehicles increases year by year, the climate restrictions on electric vehicles are becoming more and more obvious. It is well known that the performance of power batteries in low temperature environments will be limited, and even cannot be charged. In order to meet the low temperature charging requirements of power batteries, the design A power battery self-heating circuit is particularly important. [0003] At present, there are two design directions for the self-heating circuit of the power battery: ① Design the self-...

AI Technical Summary

Problems solved by technology

As the demand for new energy vehicles increases year by year, the climate restrictions on electric vehicles are becoming more and more obvious. It is well known that the performance of power batteries in low temperature environments will be limited, and even cannot be charged. In order to meet the low temperature charging requirements of power batteries, the design A power battery self-heating circuit is particularly important

[0003] At present, there are two design directions for the self-heating circuit of the power battery: ① Design the self-heating circuit using a square aluminum battery; In order to meet the heating effect, consider the built-in heating sheet, but there may be a risk of the heating sheet being corroded; 2. The internal space of the battery is small, and it is difficult to integrate the temperature sensor and control circuit in the cover plate or inside the battery; compared with square aluminum shell batteries , the pouch battery can have a good heating effect without built-in heating sheet, and the structure of the pouch battery is more flexible, which is convenient for arranging heating film and control circuit

This patent is a self-heating circuit of a power battery, which can improve the electrical performance of the battery at low temperature and solve the problem that the battery charging is affected by the low temperature

Images