Method for estimating SOH of battery

A technology for battery health status and health status, which is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices. Effect

Inactive Publication Date: 2018-09-18
BEIJING ZHIXING HONGYUAN AUTOMOBILE CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a battery state of health SOH estimation method to solve the current battery state of health SOH estimation method has low accuracy, single consideration and can not meet the real-time problems

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  • Method for estimating SOH of battery

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Embodiment Construction

[0033] The invention provides a method for estimating the SOH of the battery state of health, which considers many factors affecting battery life, such as temperature, internal resistance, capacity, charge-discharge rate, charge-discharge depth, etc., and introduces the life data of the battery cell in the entire life cycle and internal resistance data, combined with the advantages of internal resistance folding algorithm and capacity definition method, and the real-time characteristics of EKF extended Kalman filter calculation SOC and ohmic internal resistance, and through dual evaluation at the cell level and system level, it is realized. High-precision, real-time evaluation of battery SOH.

[0034] The present invention provides a method for estimating battery state of health SOH, such as figure 1 As shown, the specific steps are as follows:

[0035] 1) Obtain the temperature value T and current parameter I of the battery cell through the sensor in the PACK, and use the te...

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Abstract

The invention discloses a method for estimating the state of health (SOH) of a battery. The method comprises: a rated capacity of a current electric core in a current environment is obtained by a temperature and charge and discharge rates; an SOC value of the current electric core is calculated; a corresponding residual cycle index is obtained; a current available maximum capacity of the electriccore is obtained; a resistance value REOL at the end of the life of the electric core and an internal resistance value of the electric core going out of the factory are acquired; according to a second-order RC ring model, an actual internal resistance of the electric core is calculated; a single healthy state of an ith battery at a current time is calculated; filter calculation is carried out on the single healthy state SOHi of the ith battery at the current time by a rolling average filter; a nominal available discharge electricity quantity in the battery system life cycle is obtained; and the SOH of the battery system is calculated. According to the invention, estimation of the state of health of the battery is carried out by integrating parameters of the single battery and the battery system; and because of consideration of influence factors like the temperature, the cycle number and the internal resistance for SOH estimation of the battery, the estimation result accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a method for estimating the SOH of a battery state of health. Background technique [0002] Pure electric vehicles have the advantages of low pollution and high performance, making them the main direction of contemporary automobile development, so it is of great significance to develop and research the key technologies of pure electric vehicles. Vehicle controller, motor controller, and battery management system, as the three major components of the electric control system of pure electric vehicles, have become an important research content of electric vehicle technology. The battery management system implements charge and discharge protection, working status detection and battery pack balancing functions for the battery system, and realizes software and hardware protection and energy balance through specific algorithms. [0003] Among the many monitoring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 王静亮张君鸿陈浩
Owner BEIJING ZHIXING HONGYUAN AUTOMOBILE CO LTD
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