Lithium titanate battery pack charging method

Abstract

The invention discloses a lithium titanate battery pack charging method. According to the method, the dump energy an optimal charging current corresponding to the current temperature of the battery pack are stored in a list, before charging each time, a BMS (Battery Management System) firstly detects the dump energy and current temperature information of the battery pack and checks the list to find the corresponding optimal charging current which is primary demanded current value to be sent. In each charging process, the BMS intermittently sends charging demand information to a battery charger, the battery charger charges the battery pack according to the demanded current value in the charging demand information; when the BMS detects that the highest unit voltage in the pack reaches the highest allowable charging voltage, the current of the battery charger is reduced to be lowest, and the current charging is stopped, and BMS then sends the charging demand information again; the BMS sends the demanded current value in the charging demand information to the battery charger by adopting a ladder type lowering manner until the fully charging is achieved. According to the method, the successfully full charging of the battery pack can be ensured, and the prolonging of the service life of the battery pack is facilitated.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a charging method for a lithium titanate battery pack. Background technique [0002] The DC charging in the national standard is carried out according to the charging strategy of constant current first and then constant voltage. Due to the high safety, high stability, long life and green environmental protection characteristics of lithium titanate, it is foreseeable that it will become the anode material of a new generation of lithium-ion batteries in the near future and be widely used in new energy vehicles, electric motorcycles and Applications requiring high safety, high stability and long cycle times. However, due to the constant current charging of the lithium titanate battery pack, a large current of 2C-6C is required for charging, so when it is converted to a constant voltage and current reduction charging stage, the current reduction process is often due to the ...

AI Technical Summary

Problems solved by technology

However, due to the constant current charging of the lithium titanate battery pack, a large current of 2C-6C is required for charging, so when it is converted to the constant voltage and current reduction charging stage, the current reduction process is often due to the large current, and the maximum voltage of the single battery The drop is very small, so it will soon be reduced to the minimum charging cut-off current, resulting in the charging being terminated when the charging is not fully charged.

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