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Battery pack health condition evaluation method based on battery SOC (state of charge) inhomogeneity

A technology of health status and evaluation method, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as inaccurate conclusions and roughly evaluating the health status of battery packs

Active Publication Date: 2013-06-26
SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that this method is only used to roughly evaluate the health status of the battery pack, and the conclusions obtained are not accurate

Method used

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  • Battery pack health condition evaluation method based on battery SOC (state of charge) inhomogeneity
  • Battery pack health condition evaluation method based on battery SOC (state of charge) inhomogeneity
  • Battery pack health condition evaluation method based on battery SOC (state of charge) inhomogeneity

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the examples.

[0031] A method for evaluating the state of health of a battery pack based on the maximum available capacity of the battery pack, the method sequentially comprising the following steps:

[0032] (1) Measure and calculate the battery pack information data at m different times during the operation of the battery pack (the number of single cells is n), and the information data at each time include the state of charge SOC of each single battery in the battery pack, The state of health SOH of each single battery, and the rated capacity Cap of the battery pack.

[0033] Assuming n=50, m=11, and the time interval between every two battery pack information data points is 1 hour (3600s), the SOC data of the battery pack at rest time is measured, as shown in Table 1.

[0034] Table 1

[0035]

[0036]

[0037] (2) Calculate the SOC non-uniformity USOC of the single battery ...

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Abstract

The invention relates to a battery pack health condition evaluation method based on battery SOC (state of charge) inhomogeneity. The method sequentially includes the steps: (1) measuring and calculating battery pack information data at m different moments in a battery pack operational process; (2) calculating battery cell SOC inhomogeneity USOCi corresponding to the battery pack information data at the m different moments; (3) calculating battery pack maximum available capacity CMaxi corresponding to the battery pack information data at the m different moments; (4) obtaining a fitting function p(USOCi); (5) calculating a correlation coefficient r; and (6) reselecting an any moment k, calculating maximum available capacity CMaxk of a battery pack at the moment, making judgment, and if the judgment is satisfied, indicating that the battery pack is poor in health condition and needs to be replaced and maintained, otherwise, indicating that the battery pack is good in health condition and needs not to be maintained. The method is high in accuracy of calculated maximum available capacity values, simple in calculation and capable of showing health conditions of the battery pack more timely and rapidly.

Description

technical field [0001] The invention relates to a method for evaluating the state of health of a battery pack, in particular to a method for evaluating the state of health of a battery pack based on the non-uniformity of battery SOC. Background technique [0002] In my country, domestic leading enterprises and research institutes are already developing large-capacity energy storage systems, and 863 in other technical fields are also actively supporting the research of large-capacity lithium-ion batteries. However, since various research institutions in the early stage focused on the research and development of large-capacity batteries and devices, they ignored the operation and maintenance technology of large-capacity energy storage battery packs and battery stacks. In the application of energy storage power stations, it is necessary to use hundreds of batteries in series to meet the needs of high voltage and high power. In order to make better use of the use efficiency of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 陈满李勇琦黄晓东刘邦金钟朝现王浩刘爱华彭鹏王文辉
Owner SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD