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Method and system for detecting SOH (State Of Health) of lead-acid storage battery

A lead-acid battery, detection method technology, applied in the direction of measuring electricity, measuring device, measuring electrical variables, etc., can solve problems such as error in detection results

Active Publication Date: 2015-04-08
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on this, it is necessary to provide a lead-acid battery SOH detection method and system for the technical problem that the lead-acid battery SOH detection technology in the prior art is generally only applicable to a single state of the battery, resulting in large errors in the detection results.

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  • Method and system for detecting SOH (State Of Health) of lead-acid storage battery

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Embodiment Construction

[0022] The specific implementations of the method and system for detecting lead-acid battery SOH of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] refer to figure 1 , figure 1 Shown is the flow chart of the lead-acid storage battery SOH detection method of an embodiment, comprises the following steps:

[0024] S10, obtain the current I of the lead-acid battery in the nuclear capacity test, and the slope K of the voltage change line of the i-th single lead-acid battery i , according to the current I, slope K i Determining the charge capacity SOH of a lead-acid battery 1 ;i=1,2,3...n, n represents the number of cells of the lead-acid battery;

[0025] In the above step S10, the nuclear capacity test refers to discharging the lead-acid battery at 0.1C (10% of the capacity of the lead-acid battery) for more than 8 hours to detect whether the charge capacity of the lead-acid battery meets the requirements. The nuc...

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Abstract

The invention provides a method and a system for detecting the SOH (State Of Health) of a lead-acid storage battery. The method for detecting the SOH of the lead-acid storage battery comprises the steps of obtaining current I of the lead-acid storage battery in a charge capacity test and a slope K1 of a voltage change straight line of an i-th single lead-acid storage battery, and determining a charge capacity SOH1 of the lead-acid storage battery according to the current I and the slope Ki, wherein i=1, 2, 3... n, and n refers to the number of single lead-acid storage batteries; obtaining a preset internal resistance Re, an actually-measured internal resistance Rm and a theory SOH value of the lead-acid storage battery in a ti period, and determining an internal resistance SOH2 of the lead-acid storage battery in a floating charge process according to the preset internal resistance Re, the actually-measured internal resistance Rm and the theory SOH value in the ti period; determining the SOH of the lead-acid storage battery according to the charge capacity SOH1 and the internal resistance SOH2. According to the method and the system for detecting the SOH of the lead-acid storage battery, provided by the invention, by analyzing all correlative physical parameters of the lead-acid storage battery in the ti period and determining the SOH of each correlative physical parameter, corresponding SOH can be accurately detected when the method for detecting the SOH of the lead-acid storage battery is applied to each stage of the lead-acid storage battery.

Description

technical field [0001] The invention relates to the technical field of storage battery detection, in particular to a method and system for detecting the SOH of a lead-acid storage battery. Background technique [0002] SOH, that is, state of health, refers to the state of health of the battery. It is generally defined as the ratio of the current full capacity of the battery to the nominal capacity of the battery, which mainly reflects the current capacity of the battery. At present, most of the research on battery life at home and abroad focuses on the research on the charge and discharge cycle life of batteries, and there is little research on the long-term floating charge use mode of lead-acid batteries in substations. [0003] In a substation, only the ratio of the internal resistance at a certain moment is generally used when calculating the battery SOH. Since there is a nonlinear relationship between the internal resistance of the battery and the battery capacity, and ...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 钟国彬刘新天魏增福刘世念苏伟何耀曾国建
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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