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Lithium-ion battery pack health state assessment method

A lithium-ion battery pack, state of health technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of avoiding inaccuracy, improving authenticity, and improving accuracy

Active Publication Date: 2014-05-28
컨템포러리엠퍼렉스테크놀로지씨오리미티드
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Problems solved by technology

[0008] However, the error of the above method comes from two aspects: the R of the battery pack DCC There will be changes in different SOC (state of charge of the battery pack, State of Charge), the higher the SOC, the R DCC The smaller, the lower the SOC R DCC larger; in addition R DCC The value will also change at different temperatures, the higher the temperature R DCC The smaller, the lower the temperature R DCC bigger

Method used

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  • Lithium-ion battery pack health state assessment method
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Embodiment Construction

[0022] The method for evaluating the state of health of a lithium-ion battery pack according to the present invention will be described in detail below with reference to the accompanying drawings.

[0023] refer to figure 1 , according to the evaluation method of the state of health of the lithium-ion battery pack of the present invention, wherein the lithium battery pack with the battery management system is charged on the charge-discharge machine and the state-of-health of the lithium-ion battery pack is carried out based on the process from the beginning of charging to the end of full charge Calculation, SOH is calculated according to the following formula,

[0024] SOH = C Cal C Exp × 100 %

[0025] in,

[0026] C Cal is the actual current integration capacity value of the lithium-ion battery pack from the beginning of...

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Abstract

The invention provides a lithium-ion battery pack health state assessment method. A lithium battery pack with a battery management system is charged on a charging-discharging motor, computing of the health state of a lithium-ion battery pack based on the process from charging starting to full-charging stopping is carried out, SOH is computed according to the following formula, SOH = CCal / CExp * 100%, CCal is the practical current integration capacity value of the lithium-ion battery pack from charging starting to full-charging stopping, I is charging currents, t0 is charging starting time, tn is charging stopping time, CExp is the capacity value which the lithium-ion battery pack should have from charging starting to full-charging stopping, CExp = (SOCChgF - SOCChg0) * CR, CR is the nominal capacity value of the lithium-ion battery pack, SOCChgF is the SOC value during full-charging stopping, SOCChg0 is the SOC value of the charging starting moment, the judging criterion of full-charging stopping is that lithium battery pack charging voltages reach Vreated * N, and I <= 0.1 C, wherein Vreated is the full-charging voltages of batteries in the lithium battery pack, N is the number of the batteries connected in series in the lithium battery pack, and if CCal is larger than CExp, the value is abandoned and is not used. Accordingly, the accuracy and the authenticity of SOH estimation are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for evaluating the health state of a lithium ion battery pack. Background technique [0002] In the prior art, the evaluation of the health status of lithium-ion battery packs mainly adopts the method of calculating the DC internal resistance to evaluate the health status of the battery pack, which is calculated by dividing the DC internal resistance of the battery pack when it leaves the factory by the current DC internal resistance of the battery pack. Indicates SOH (state of health): [0003] SOH = R DCR R DCC × 100 % [0004] Among them, R DCR is the DC internal resistance of the battery pack when it leaves the factory, R DCC is the current DC internal resistance of the battery pack. [0005] According to th...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 李春青庄铭军
Owner 컨템포러리엠퍼렉스테크놀로지씨오리미티드
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