Power battery DC charging management method and system

Abstract

The invention relates to a management method and system of direct-current charging of a power battery, relates to the technical field of the direct-current charging of the power battery, and mainly aims to improve the reliability of the direct-current charging of the power battery in a low-temperature environment. The management method mainly adopts a technical scheme which is characterized by comprising the following steps of obtaining the temperature value of the rechargeable battery; judging whether the temperature value of the rechargeable battery is greater than a first low temperature threshold or not; and if the temperature value of the rechargeable battery is smaller than the first low temperature threshold, starting first charging strategy technological process, namely enabling a heater to work, and heating the rechargeable battery, so that the temperature of the low-temperature rechargeable battery is improved to a temperature suitable for charging. Compared with the prior art, the management method can improve the reliability of the safety of the direct-current charging of the power battery in a low-temperature state.

Description

technical field [0001] The present invention relates to the technical field of direct current charging of power batteries, in particular to a method and system for managing direct current charging of power batteries. Background technique [0002] Off-board chargers are divided into DC charging piles and AC charging piles. DC charging piles are fixedly installed outside the electric vehicle and connected to the AC power grid to provide DC power supply for the power battery of off-board electric vehicles. The DC charging pile adopts a three-phase four-wire system for power supply, which can provide sufficient power, and can meet the requirements of fast charging compared with the AC charging pile. [0003] There is a battery management system in the electric vehicle power battery. After the battery management system detects that the charging socket of the electric vehicle is connected to the charging gun of the DC charging pile, the battery management system can communicate wi...

AI Technical Summary

Problems solved by technology

However, at the same time, lithium-ion power batteries also have some insurmountable shortcomings. In low-temperature environments, such as below zero degrees Celsius, lithium-ion power batteries have great polarization compared to normal temperatures (such as above 20 degrees Celsius). The charging capacity decreases rapidly, and the charging capacity is poor

If the user uses a DC charging pile to charge the lithium-ion power battery of an electric vehicle in a low-temperature environment (such as below zero degrees Celsius), it will reduce the performance and service life of the lithium-ion power battery, and may greatly reduce its safety.

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