Measuring and calculating method and apparatus of SOH of battery of electric vehicle

An electric vehicle battery, 1-SOH2 technology, applied in the field of electric vehicles, can solve the problems of lack of versatility, high cost, time-consuming and laborious, etc., achieve high-precision real-time monitoring, easy algorithm parameters, and improve the effect of estimation accuracy

Active Publication Date: 2017-08-04
HANYU GRP CO LTD
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Problems solved by technology

[0005] 1. Due to the scattered distribution of battery internal resistance, the internal resistance difference between different batteries is relatively large, and the relationship between internal resistance and SOH is not universal
[0006] 2. The standard experimental test of SOH requires offline testing, which is tim

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  • Measuring and calculating method and apparatus of SOH of battery of electric vehicle
  • Measuring and calculating method and apparatus of SOH of battery of electric vehicle

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[0042] Hereinafter, the present invention will be further described in detail with reference to the embodiments and drawings, but the implementation of the present invention is not limited thereto.

[0043] In order to detect the batteries of electric vehicles in real time, the present invention provides a method for measuring the SOH of electric vehicle batteries in view of the defects of the prior art. The method mainly combines the cycle power generation and capacity method to achieve real-time monitoring with higher accuracy. the goal of. It is specifically introduced through the following embodiments:

[0044] See figure 1 , Which is a flow chart of the steps of the method for measuring the SOH of the electric vehicle battery of the present invention. The method for calculating SOH of electric vehicle battery of the present invention specifically includes the following steps:

[0045] S1: The SOH value of the current battery is measured by the battery cycle power method, SOH ...

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Abstract

The invention provides a measuring and calculating method of the SOH of a battery of an electric vehicle. The method includes following steps: S1, measuring a SOH value of the current battery through a battery cyclic coulometric method, wherein SOH1=1-Q/(5Qt), Q is the accumulated discharge quantity of the battery, and Qt is the discharge quantity of the battery in a lifetime period range; S2, measuring the SOH value of the current battery through a volumetric method, wherein SOH2=QN/QC, QN is the maximum capacity of the current battery, and QC is the nominal capacity of the battery; and S3, determining whether SOH1 and SOH2 are the same, wherein the real-time SOH value of the battery is SOH1 if yes, and if not, Qt is corrected, the corrected Qt=Q/(5(1-SOH2)), and SOH1 is calculated according to the corrected Qt. Compared with the prior art, according to the method, high-precision and real-time monitoring of the battery can be realized with the combination of characteristics of the cyclic coulometric method and the volumetric method.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a method and device for measuring and calculating the SOH of an electric vehicle battery. Background technique [0002] A battery pack or battery pack, with continuous charge and discharge cycles, the battery capacity will continue to decrease, and the battery will continue to age. This indicator for judging battery aging is SOH (battery state of health). Monitoring the SOH state of the battery can know the aging state of the battery in time, and perform maintenance and replacement of the battery pack in time. [0003] At present, there are several methods for testing battery SOH: one is to study the relationship between capacity decay and internal resistance increase and SOH from the perspective of battery aging mechanism; the other is to measure battery SOH off-line through standard test experiments from an experimental point of view; One is to establish a battery model, and u...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 黄浩张伟森刘群柏伟杰许兴发
Owner HANYU GRP CO LTD
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