Power battery system and charging method for optimizing heating strategy through low-temperature charging

Abstract

The invention relates to the technical field of electric vehicle charging and discloses a power battery system and a charging method for optimizing a heating strategy through low-temperature charging.When the power battery system is charged under a low-temperature condition, temperature rising is achieved through a heating system, when the temperature reaches an allowable low-current charging state, heating and charging are performed at the same time, the temperature of the power battery system is increased through heat generated by the heating system, reaction heat and joule heat of the power battery system, the temperature of the power battery system rises rapidly and is in the rated continuous large-current charging process rapidly, and the charging time under the low-temperature condition is shortened. The power battery system is advantaged in that a heating stopping temperature point is determined as a balance point of the heat release amount of a power battery and heat generatedby the heating system, a problem that the heating system is repeatedly started due to continuous temperature drop after the heating system is stopped is solved, and the effects of short charging timeunder the low-temperature condition and repeated heating system starting prevention are achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to a power battery system and a charging method for an optimized heating strategy for low-temperature charging. Background technique [0002] With the global demand and emphasis on energy and environmental protection issues, new energy vehicles have emerged as the times require, because such vehicles meet the needs of sustainable social development. Coupled with my country's policy encouragement and subsidies for new energy vehicles, electric vehicles in China are becoming more and more popular, and various models such as commercial vehicles and passenger vehicles have been widely used. [0003] As the power source of new energy vehicles, lithium-ion batteries are an important part of new energy vehicles, and their performance directly affects the use of electric vehicles. Among all environmental factors, temperature has the greatest impact on the charge and disch...

AI Technical Summary

Problems solved by technology

However, the unreasonable heating strategy during the low-temperature charging process will cause the heating circuit to be turned on repeatedly or the low-temperature charging time will be too long, resulting in poor consumer experience, and users complain a lot

[0004] Therefore, the applicant provides a charging method with an optimized heating strategy for charging under low temperature conditions, which is mainly used to solve the problem of charging electric vehicles for too long under low temperature conditions and repeatedly starting the heating system

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