Acquisition method for different charging and discharging curves of lithium batteries

Abstract

The invention relates to a quick acquisition method for charging and discharging curves under different working conditions of lithium batteries. The acquisition method for different charging and discharging curves of the lithium batteries comprises the following steps that (1) data of lead acid batteries is acquired, and a linear voltage relation at different given constant-current multiplying powers in different intervals of the lithium batteries and a linear voltage relation table fm() at different temperatures are established; (2) a complete charging voltage and SOC curve Chavolni(sock) anda discharging voltage and SOC curve Disvolni(sock) under the constant-current condition are acquired. The acquisition method of different charging and discharging curves of the lithium batteries hasthe advantages that each kind of battery does not need to be subjected to different constant-current charging and discharging tests multiple times for acquiring the corresponding charging and discharging voltage and SOC curves, the corresponding charging and discharging voltage and SOC curves at different temperatures can be corrected according to environment temperatures, and accordingly the SOCcalculation of the lithium batteries is more accurate.

Description

technical field [0001] The invention relates to a method for quickly acquiring discharge curves of a lithium battery under different working conditions. Background technique [0002] Batteries have the advantages of high working voltage and specific energy density, good cycle performance, and no memory effect. They are widely used in energy storage batteries for portable devices and have great potential in new energy sources. The former mainly includes 3C products, namely computers, communications and consumer electronics products. Power batteries include electric bicycles, new energy vehicles, and electric tools. With the further improvement of the cost performance of lithium batteries, it will be extended to large-scale solar energy systems, grid peak regulation, and residential power storage facilities in the future. The state of charge of the battery is an important indicator during the use of the battery, that is, the ratio of the actual power that can be provided in ...

AI Technical Summary

Problems solved by technology

[0004] At present, the standard data of different lithium batteries is generally obtained by experiment to obtain the corresponding curve of discharge voltage and SOC, and the corresponding curve of charging voltage and SOC, which is very time-consuming and not effective, or just use the same standard data regardless of the battery model

However, there are large differences in the battery characteristics of different battery manufacturers, and there are also differences in the battery groups of the same manufacturer and the same batch. Therefore, using the same discharge voltage and SOC corresponding curve, charging voltage and SOC corresponding curve cannot be applied to all lithium batteries.

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