Method and system for estimating state of health of power battery cells
A technology for power battery and state of health, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of high requirements on chip computing power and difficult to transplant SOH estimation, etc., to achieve the effect of improving the scope of application and reducing the complexity
Active Publication Date: 2021-08-13
合肥国麒新能源科技有限公司
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However, for the embedded chip of the actual BMS, the above algorithm has high requirements for the computing power of the chip, so it is difficult to transplant it into the embedded system for online SOH estimation
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[0062] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the implementation manners of the present invention, and are not intended to limit the implementation manners of the present invention.
[0063] In the embodiments of the present invention, unless stated otherwise, the used orientation words such as "up, down, top, bottom" are usually for the directions shown in the drawings or for vertical, vertical or The term used to describe the mutual positional relationship of each component in terms of the direction of gravity.
[0064] In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not b...
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The embodiments of the present invention provide a method and system for estimating the state of health of a traction battery unit, which belong to the technical field of state estimation of traction batteries. The method includes: obtaining a plurality of voltage values of the power battery unit at different time points during the charging process under the condition of constant current and constant temperature; inputting the voltage values into a trained neural network to obtain the state of health . The system includes a constant current power supply for constant current charging of the power battery unit; a temperature control device for maintaining the temperature of the power battery unit; a voltage sensor; a controller with a built-in trained neural network, It is used to: obtain multiple voltage values of the power battery unit at different time points during the constant current charging process through the voltage sensor; use the neural network to obtain all the voltage values of the power battery unit according to the multiple voltage values. state of health. The method and system can improve the accuracy of estimating SOH.
Description
technical field [0001] The present invention relates to the technical field of state estimation of a power storage battery, in particular to a method and system for estimating the health state of a power storage battery unit. Background technique [0002] The power battery system has become one of the most important energy storage components of new energy vehicles. As the number of times the battery is used increases, its State of Health (SOH) will change significantly, which will directly affect the charge and discharge performance, temperature stability and system security of the battery system. At the same time, unlike external measurable physical quantities such as battery voltage and current, battery SOH cannot be directly measured by sensors. Therefore, estimating and calculating the battery SOH based on the external measurable physical quantities of the battery is the main way to obtain the battery SOH. [0003] The commonly used definition of SOH is: SOH=C now / C ...
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IPC IPC(8): G01R31/392G01R31/367G01R31/396
CPCG01R31/367G01R31/392G01R31/396
Inventor 武骥刘兴涛
Owner 合肥国麒新能源科技有限公司