A soc estimation method for power battery pack under different working conditions
A technology of power battery pack and battery pack, applied in the field of SOC estimation, can solve problems such as poor estimation accuracy, and achieve the effects of high accuracy, accurate SOC value and high estimation accuracy
Active Publication Date: 2021-11-02
DONGFENG MOTOR CORP HUBEI
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[0005] The embodiment of the present application provides a method for estimating the SOC of a power battery pack under different working conditions to solve the technical problem of poor SOC estimation accuracy of a power battery pack in the related art
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[0045] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.
[0046] see figure 1 As shown, the embodiment of the present application provides a method for estimating the SOC of a power battery pack under different working conditions, which includes steps:
[0047] A1: When the electric vehicle is parked and powered on, the SOC value of the current working condition is obtained according to the r...
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This application relates to a method for estimating the SOC of a power battery pack under different working conditions, including the steps of: when the electric vehicle is parked and powered on, according to the aging degree, battery temperature, battery internal resistance, open circuit voltage and power battery charge at different times, The relational expression of the SOC value of the battery state can be used to obtain the SOC value of the current working condition; under the constant voltage charging condition of the battery pack, the SOC value of the current working condition is estimated by using the ampere-hour integral method; under the normal working condition of the battery pack, combined with the safety The time integration method and the filter iteration algorithm of the battery equivalent circuit model are used to estimate the SOC value under the current working condition. The SOC estimation method of the power battery pack under different working conditions provided by the present application can be better applied to the SOC estimation of different working conditions, so that the estimation accuracy is higher and the method is more reliable.
Description
technical field [0001] This application relates to the technical field of new energy electric vehicles, in particular to a method for estimating the SOC of power battery packs under different working conditions. Background technique [0002] With the promotion and popularization of new energy electric vehicles, in order to more accurately calculate the cruising range and control the output of battery energy, it is necessary to estimate the SOC (state of charge, power battery state of charge). [0003] In related technologies, methods for estimating the SOC of new energy electric vehicles include the OCV open circuit voltage method, the ampere-hour integration method, and the Kalman filter method. The above-mentioned open-circuit voltage method is only applicable when the load has no current. The ampere-hour integration method has the problem of cumulative error, and the Kalman filter method requires a large calculation model. [0004] However, when estimating the SOC of new...
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IPC IPC(8): G01R31/382B60L58/12
CPCB60L58/12G01R31/382Y02T10/70
Inventor 黄红波刘爽李康周坤孙章勇
Owner DONGFENG MOTOR CORP HUBEI