Method and apparatus for acquiring battery performance parameter

Abstract

The invention provides a method and apparatus for acquiring a battery performance parameter. The method comprises: acquiring a first mapping relationship between a standard state of charge (SOC) and adisplay SOC; acquiring a first display SOC currently displayed on a screen; according to the first display SOC and the first mapping relationship, acquiring a first standard SOC corresponding to thefirst display SOC; and on the basis of the first standard SOC, inquiring a second mapping relationship between the standard SOC and a battery performance parameter and acquiring a battery performanceparameter corresponding to the first standard SOC and displaying the obtained parameter. With the method provided by the invention, flexible calculation of related performance parameters of the SOC isrealized by using the tested data fully under the circumstance that performance parameter testing is carried out once only based on the standard testing condition, so that repeated testing for different usage zones is avoided and thus consumption of testing resources is reduced. A technical problem that lots of testing resources are consumed because performance parameters are tested again for each change of an available capacity window is solved.

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...

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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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