Method and device for obtaining battery performance parameters

Abstract

The present invention proposes a method and device for acquiring battery performance parameters, wherein the method includes: acquiring the first mapping relationship between the standard state of charge SOC and the displayed SOC; acquiring the first displayed SOC currently displayed on the screen; according to the first displaying the SOC and the first mapping relationship, acquiring a first standard SOC corresponding to the first displaying SOC; querying a second mapping relationship between the standard SOC and battery performance parameters according to the first standard SOC, Acquiring and displaying battery performance parameters corresponding to the first standard SOC. Through this method, the tested data can be fully utilized to realize the flexible calculation of SOC-related performance parameters under the condition of only performing a performance parameter test according to the standard test conditions, avoiding retesting for different use intervals, and reducing test resources consumption, which solves the technical problem in the prior art that the performance parameters are retested every time the available capacity window changes, consuming huge testing resources.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and device for acquiring battery performance parameters. Background technique [0002] Most electric vehicles use lithium-ion batteries for power supply. Many parameters of lithium-ion batteries are related to the state of charge (SOC), such as open circuit voltage (Open Circuit Voltage, OCV), DC internal resistance (DCInternal Resistance, DCIR) , peak charge / discharge power, etc. [0003] Usually, when testing battery peak charging / discharging power, open circuit voltage and other performance parameters related to SOC, SOC is defined based on the rated capacity of the battery cell, but in actual use, SOC is defined based on the available capacity. Since the Depth of Discharge (DOC) of the same battery may be different when used in different products, it will consume a lot of power to retest parameters such as peak charge / discharge power and open circuit voltage every...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the first object of the present invention is to propose a battery performance parameter acquisition method, to realize the battery performance parameters of the standard test are mapped to the performance parameters of different use intervals by establishing the correspondence between the standard SOC and the displayed SOC , under the condition of only one performance parameter test according to standard test conditions, the tested data can be fully utilized to realize flexible calculation of SOC-related performance parameters, avoiding re-testing for different use intervals, and reducing the consumption of test resources. It solves the technical problem of retesting performance parameters every time the available capacity window changes in the prior art and consumes a lot of testing resources

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