Method and device for adjusting soh coefficient of power battery

A power battery and coefficient technology, applied in the field of vehicle engineering, can solve problems such as large errors and poor real-time performance, and achieve the effect of solving large errors and improving accuracy

CN107121642BActive Publication Date: 2020-02-18BEIJING ELECTRIC VEHICLE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-02-18

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Abstract

The invention discloses a SOH (State of Health) coefficient regulation method and device for a power battery. The method comprises the following steps: carrying out discharging on a power battery to be regulated; acquiring discharge data of the power battery in the discharging process; according to the discharge data, judging whether to regulate a current SOH coefficient of the power battery; when judging that the current SOH coefficient needs to be regulated, acquiring a regulation strategy; in the next charging process, regulating the current SOH coefficient by using the regulation strategy so as to obtain a target SOH coefficient of the power battery. According to the method, by judging whether to regulate the current SOH coefficient according to the discharge data in the discharging process, acquiring the regulation strategy if the current SOH coefficient needs to be regulated and regulating the SOH coefficient according to the acquired regulation strategy in the next charging process, real-time judgment and regulation on the SOH coefficient in the using process of the power battery are implemented, and accuracy of the estimated SOH coefficient is improved.
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Description

technical field

[0001] The invention relates to the field of vehicle engineering, in particular to a method and device for adjusting the SOH coefficient of a power battery. Background technique

[0002] As the service life of the power battery increases, the capacity and power performance of the power battery will show a declining trend. In the case of power battery life attenuation, if the State of Health (SOH) coefficient cannot be accurately estimated, it will inevitably affect the evaluation of the capacity and power performance of the power battery, thereby reducing the performance of the battery and the efficiency of use. Reliability, even overload use, dangerous accidents may occur.

[0003] At present, there are mainly two methods for estimating the SOH coefficient. One is to estimate the SOH coefficient by estimating the internal resistance of the battery; the other is to estimate the SOH coefficient by counting the cumulative charge capacity and cumulative dischar...

Examples

Embodiment Construction

[0051] 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 and are intended to explain the present invention and should not be construed as limiting the present invention.

[0052] The method and device for adjusting the SOH coefficient of a power battery according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0053] As the service life of the power battery increases, the capacity and power performance of the power battery will show a declining trend. In the case of power battery life attenuation, if the SOH coefficient cannot be accurately estimated, it will inevitably affect the evaluation of the capacity and power performance of ...