Method and system for detecting capacity of secondary battery

Abstract

The invention discloses a method for detecting the capacity of a secondary battery, which comprises the following steps of: calculating a difference between internal resistance of a battery to be detected and internal resistance of a standard battery; calculating a drop-out value V2, which is equal to R3*I1, of the battery to be detected relative to a discharge platform of the standard battery, wherein the I1 is selected from a discharge current value of a matrix relationship data sheet of a prestored standard battery; and calculating the capacity of the battery to be detected and / or the capacity percentage of the battery to be detected according to the matrix relationship data sheet and the drop-out value V2 of the discharge platform. By the method and a system for detecting the capacityof the secondary battery, the testing time is short; a large amount of energy cannot be wasted, and the cycle life cannot be shortened; and a testing result is relatively accurate, and the cost is low.

Description

technical field [0001] The invention relates to the field of battery application, in particular to a method and system for detecting the capacity of a secondary battery. Background technique [0002] In the field of battery applications, there are currently two methods for detecting the remaining battery power: 1. The traditional method mainly uses the MCU to detect the battery voltage and combine the custom algorithm to estimate the remaining battery power; 2. Applications that require high precision , generally adopts the dedicated fuel gauge IC designed by TI, MAXIM and other companies to detect the remaining power of the battery. [0003] Solution 1: Fully charge the battery to be tested with constant current and constant voltage according to the IEC standard, and then discharge it to the cut-off voltage at a constant current. The product of the constant current and the discharge time represents the discharge capacity of the battery. [0004] Disadvantages of Solution 1...

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Problems solved by technology

[0004] Disadvantages of Solution 1: The detection time is long, and a complete charge-discharge cycle is required for the battery to be tested. The most important thing is that a lot of energy is wasted and the cycle life is reduced once.

[0006] Disadvantages of Scheme 2: This detection method is suitable for battery manufacturers to do battery capacity detection, but not suitable for capacity detection in battery application fields

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