Power battery SOH (state of health) value estimation method and system

A power battery, battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of simple process and high accuracy

Active Publication Date: 2018-11-16
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It can be seen from the above that the evaluation of battery SOH in the prior art is mainly based on the estimated value of SOC of the battery management system and the measured value of the voltage of the battery p

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  • Power battery SOH (state of health) value estimation method and system
  • Power battery SOH (state of health) value estimation method and system
  • Power battery SOH (state of health) value estimation method and system

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Embodiment Construction

[0063] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0064] The present invention provides an embodiment of a method for estimating the SOH value of a power battery, such as figure 1 As shown, specifically, the following steps may be included:

[0065] Step S1, determine to enter the slow charging mode;

[0066]The charging of the power battery is divided into fast charging and slow charging. The implementation of the present invention is aimed at the slow charging mode with a more stable state. Among them, there are many existing ways to identify fast charging or slow charging, such as t...

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Abstract

The invention discloses a power battery SOH (state of health) value estimation method and system. The method includes the following steps that: step S1, it is confirmed that a power battery enters a slow charging mode; step S2, whether the SOC value of the power battery has been subjected to OCV correction before charging is judged, if the SOC value of the power battery has been subjected to the OCV correction before charging, a step S3 is performed; step 3, a first power correction value is obtained, wherein the first power correction value is an OCV-corrected SOC value; step S4, a cumulativedischarging capacity from a time point when OCV correction is performed to a time point before charging is acquired; step S5, a first charging capacity is acquired after the power battery is fully charged; step S6, the actual capacity of the battery is calculated according to the first charging capacity, the cumulative discharging capacity, and the first power correction value; step S7, the preset initial capacity of the battery is obtained; and step S8, the SOH value of the battery is obtained according to the actual capacity and initial capacity of the battery. With the power battery SOH (state of health) value estimation method and system of the invention adopted, a large quantity of calibration data or laboratory estimation is not required, estimation parameters can be obtained onlineduring normal use, and a process is simple and accurate.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a method and system for estimating the SOH value of a power battery. Background technique [0002] As the capacity of the power battery continues to decline during use, the difference in the consistency of the battery gradually increases, and the SOH value of the pure electric vehicle battery pack is also constantly declining. During the driving of electric vehicles, it is necessary to be able to estimate the state of health (SOH) of the battery pack in order to evaluate how much capacity the battery pack can be effectively utilized. If the accuracy of SOH is not high, the state of charge (SOC) of the battery will be inaccurate, and the estimation error of SOC is large, which may cause the electric vehicle to be forced to stop halfway due to insufficient power. [0003] Although the SOH value of the battery can be obtained through experiments in the laboratory, there are no va...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 梁荣荣秦李伟李忠庞艳红王文科
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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