Rapid detection method for health degree of battery module

A battery module and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of low detection efficiency, high cost of development programs, etc., and achieve the effect of accurate results

Inactive Publication Date: 2020-07-28
国网陕西省电力公司汉中供电公司 +3
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Problems solved by technology

Yan et al. used six selected decommissioned lithium iron phosphate batteries to test the cycle life of the battery under three typical energy storage load curves, and used the least square method to evaluate the battery life and input the IC curve characteristics into the regression model. The research results showed that the minimum The err...

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  • Rapid detection method for health degree of battery module
  • Rapid detection method for health degree of battery module
  • Rapid detection method for health degree of battery module

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Experimental program
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Embodiment

[0042] Embodiment: First, the available capacity of the battery module is calibrated, and the battery module health SOH of the battery module is calculated, Available capacity measurement steps: (1) charge with C / 5 constant current and constant voltage to the specified upper limit cut-off condition of the battery module; (2) stand still for 30 minutes; (3) discharge with C / 5 constant current to the specified lower limit cut-off condition of the battery module ; (4) Stand still for 30 minutes; use the discharge capacity as the available capacity. Tested 7 battery modules with different capacities, marked as 1#, 2#, 3#, 4#, 5#, 6#, 7#, and their usable capacities are 37.59Ah, 33.77Ah, 30.69Ah, 28.58Ah, 27.2Ah, 25.81Ah, 24.83Ah, the specific results are as follows figure 1 shown.

[0043] Such as figure 2 As shown, then the battery management system collects the working voltage data of the battery module with known available capacity in the voltage platform during the chargi...

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Abstract

The invention discloses a rapid detection method for the health degree of a battery module. The method comprises the following steps: acquiring platform voltage data of a battery module sample with known available capacity in a charging and discharging process; establishing a probability density function PDF curve of a known available capacity battery module sample according to the platform voltage data, and calculating a peak area of a set voltage interval; fitting and establishing a battery module health degree SOH-probability density function PDF curve; obtaining the relationship between the voltage data and the battery aging degree in the charging and discharging process of the battery module, wherein only platform voltage data in the charging and discharging process of the to-be-detected battery module needs to be detected in the detection process; and establishing a battery module health degree SOH value of a battery module sample corresponding to the consistency of the peak areain the battery module health degree SOH-probability density function PDF curve and the detection peak area, wherein the battery module health degree SOH value is the battery module health degree SOHvalue of the to-be-detected battery module. The method is simple, the detection speed is high, the battery module does not need to be independently modeled and detected, and the detection result is accurate.

Description

technical field [0001] The invention relates to a battery operation and maintenance technology, in particular to a method for quickly detecting the health of a battery module. Background technique [0002] Energy storage provides important technical support for the construction of the ubiquitous power Internet of Things, including clean energy consumption and comprehensive energy services, and more and more lithium battery energy storage power stations are becoming an important part of power grid transmission, transformation and distribution. component. After the energy storage power station has been in operation for a period of time, the performance of lithium batteries with good consistency gradually becomes uneven, which brings potential risks to the safe and efficient operation of the energy storage power station. Low-cost and fast online detection of battery health is the core technology that the operation and maintenance personnel of energy storage power stations and ...

Claims

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Application Information

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IPC IPC(8): G01R31/392G01R31/367
CPCG01R31/392G01R31/367
Inventor 刘俊华廖强强李程韩军林刘子瑞张健吕思濛赵学风李义仓鲍磊李新周李志忠李旭刘树林王友平马立军林学兵吕新良胡攀峰李小军金维任洪涛
Owner 国网陕西省电力公司汉中供电公司
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