Method for testing battery SOC-OCV curve and equipment for testing battery SOC-OCV curve

Abstract

The application discloses a method for testing a battery SOC-OCV curve, and the method comprises the following steps of charging the battery to the upper limit voltage with a constant current of 0.15Cto 0.25C to obtain a first charge curve, wherein the upper limit voltage refers to the voltage when the battery is fully charged; discharging the battery to the termination voltage with the constantcurrent to obtain a first discharge curve, wherein the termination voltage refers to the lowest voltage when the battery is discharged; and determining the test SOC-OCV curve of the battery at the first constant temperature according to the average of the first charge curve and the first discharge curve. The method for testing the battery SOC-OCV curve provided by the application greatly saves thenumber of times the battery needs to stand, thereby saving the entire test time and improving the test efficiency. The application also discloses equipment capable of testing the battery SOC-OCV curve by performing the test method.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a method for testing battery SOC-OCV curves and equipment for testing battery SOC-OCV curves. Background technique [0002] The power battery is a device that converts chemical energy into electrical energy. The conversion process is a complex physical and chemical reaction process. Calculating the available remaining capacity of the power battery is useful for estimating the remaining mileage of an electric vehicle and avoiding that the vehicle cannot be driven due to no electricity. And it is of vital significance to charge the vehicle in time. [0003] The state of charge (SOC) of a power battery is one of the important parameters to characterize the state of the battery, and is often used to reflect the available remaining capacity of the battery. The open circuit voltage (OCV) is the voltage across the battery in an open circuit state. The open circuit voltage ...

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Problems solved by technology

[0004] In the traditional process of testing the SOC-OCV curve of a single temperature point, when testing the voltage of any two states of charge, it is necessary to stand for a long period of time after the test of the previous state of charge is completed ( Usually more than 2 hours) to test the voltage value of the next state of charge, making it take more than 50 hours to test a temperature point, so the traditional method of testing the SOC-OCV curve has a long period and consumes test time

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