Power battery health state assessment method and system and electric vehicle

A state of health, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of low estimation accuracy, long test time, complex modeling and other problems, and achieve a small amount of calculation and simple and convenient establishment Effect

Inactive Publication Date: 2018-06-15
BEIJING PRIDE NEW ENERGY BATTERY
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Problems solved by technology

Due to the long test time, complex and difficult modeling, or low estimation accuracy, the above methods c

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  • Power battery health state assessment method and system and electric vehicle
  • Power battery health state assessment method and system and electric vehicle
  • Power battery health state assessment method and system and electric vehicle

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Embodiment Construction

[0076] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention and are not used to limit the scope of the present invention.

[0077] figure 1 A schematic flowchart of a method for evaluating the state of health of a power battery provided by an embodiment of the present invention is given. Such as figure 1 As shown, the method includes:

[0078] S110, selecting two voltages during the charging process of the battery cell, and obtaining the charging capacity between the two voltages;

[0079] S120: Determine the correspondence between the charging capacity and the state of health between the two voltages, and establish a health state estimation model according to the correspondence;

[0080] S130: Solve the health state according to the health state estimation model.

[0081] In this embodiment, according to the charging capacity between the two voltages d...

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Abstract

The present invention relates to a power battery health state assessment method. The method comprises the steps of: selecting two voltages in a battery cell charge process, and obtaining a charge capacity between the two voltages; determining a corresponding relation between the charge capacity between the two voltages and a health state, and establishing a health state estimation model accordingto the corresponding relation; and solving the health state according to the health state estimation model. The health state estimation model is simple and convenient to establish, the estimation process is small in calculated quantity, and rapid and real-time online estimation of the health state can be achieved; part of battery charge monitoring data is only needed to perform rapid and accurateestimation of the health state of the battery, and therefore, fault early warning in a sub-health state of the battery is achieved, and the power battery health state assessment method and system andthe electric vehicle provide basis for maintenance of a battery system. The present invention further provides a power battery health state assessment system and an electric vehicle.

Description

Technical field [0001] The present invention relates to the technical field of batteries, and in particular to a method and system for evaluating the state of health of a power battery, and an electric vehicle. Background technique [0002] With the increasing of energy crisis and environmental pollution problems, countries have begun to pay attention to the use and promotion of renewable green energy. In recent years, the emergence of new energy fields such as electric vehicles and energy storage has made lithium-ion batteries a hot research direction. In addition to the research on lithium-ion batteries, battery management systems are also one of the important research directions. In the research of battery management system, the state of health (SOH) of the battery system is currently one of the weakest links. The SOH estimation of the battery system is a major defect of the current battery management system, which directly affects the practicality, economy and safety of the...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 饶帆李伟尹景云于静美
Owner BEIJING PRIDE NEW ENERGY BATTERY
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