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Method and system for evaluating health state of battery

A technology of health status and evaluation system, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of easy application

Active Publication Date: 2018-07-06
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a simple, accurate and easy-to-apply battery health state evaluation method and system in order to overcome the defects of the battery health state evaluation method in the prior art

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  • Method and system for evaluating health state of battery
  • Method and system for evaluating health state of battery
  • Method and system for evaluating health state of battery

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Experimental program
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Embodiment 1

[0061] Such as figure 1 As shown, the method for evaluating the state of health of the battery in this embodiment includes the following steps:

[0062] Step 101. Obtain life decay data of multiple batteries of the same type.

[0063] Among them, the life attenuation data includes parameters such as voltage, current and temperature of the battery during charging and discharging. The above parameters can be obtained through real-time monitoring of the battery by the BMS system (battery management system).

[0064] Step 102, smoothing and denoising the life attenuation data by using a digital filtering method. In order to screen out outliers and problematic data, the accuracy of model building in step 104 is improved.

[0065] Step 103, constructing the initial characteristic parameters of the battery according to the life decay data and calculating the capacity data sequence.

[0066] Step 104: Calculate the correlation coefficient between the capacity data sequence and the...

Embodiment 2

[0130] Such as Figure 4 As shown, the battery health status evaluation system of this embodiment includes: a data acquisition module 1 and a calculation module 2 .

[0131] The data acquisition module 1 is used to acquire life decay data of multiple batteries of the same type. Among them, the life attenuation data includes parameters such as voltage, current and temperature of the battery during charging and discharging. The above parameters can be obtained through real-time monitoring of the battery by the BMS system (battery management system).

[0132] Calculation module 2 is used to construct the target characteristic parameters of the battery and calculate the capacity data sequence based on the life decay data, and to fit the capacity data sequence and the target characteristic parameters based on the least square method to construct a health status assessment model. A state-of-health assessment model is used to calculate the effective capacity of the battery.

[013...

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Abstract

The invention discloses a method and system for evaluating the health state of a battery. The method comprises: S1, acquiring life decay data of a plurality of batteries of the same type; S2, according to the life decay data, constructing target characteristic parameters of the batteries and calculating a capacity data sequence; and S3, on the basis of a least square method, fitting of the capacity data sequence and the target characteristic parameters is carried out to construct a health state assessment model for calculating effective capacities of the batteries. The target characteristic parameters include at least one of the following parameters: an equal-voltage-drop discharging ampere-hour value, an equal-ampere-hour discharging voltage difference, an equal-voltage-drop charging ampere-hour value, and an equal-ampere-hour charging voltage difference. According to the invention, no complicated testing condition or model as well as no complete charging and discharging voltage curves on the constant current condition of the battery is needed; and the health state of the battery can be predicted accurately.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a battery health status evaluation method and system. Background technique [0002] In recent years, the application of large-capacity battery energy storage systems in power systems has developed rapidly and has great potential for development. At the same time, the safety of battery energy storage systems has also become an important factor affecting the industrialization of energy storage systems. Therefore, it is necessary to establish a state-of-health (SOH) system for batteries used in large-scale battery packs. To solve this problem, battery internal parameter estimation method, internal resistance method and equivalent circuit method are widely used in China. Among them, the internal parameter estimation method starts from the perspective of the internal physical and chemical process of the battery. Using the internal performance state parameters, the external...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/392
Inventor 张思文王锭笙李劲孙涛马永晓蒿豪
Owner SHANGHAI ELECTRICGROUP CORP
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