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Method and device for estimating state of charge of battery

A battery state-of-charge and state-of-charge technology, which is applied to measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of not considering the influence of charge transfer resistance and inaccurate estimation of battery state of charge

Active Publication Date: 2020-01-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing scheme does not consider the influence of charge transfer resistance and diffusion resistance on the total internal resistance of the battery, and the calculated estimated value of the battery state of charge is inaccurate

Method used

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  • Method and device for estimating state of charge of battery
  • Method and device for estimating state of charge of battery
  • Method and device for estimating state of charge of battery

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Embodiment Construction

[0036] Embodiments of the present application provide a method and device for estimating the state of charge of a battery, which are used for estimating the state of charge of the battery based on a battery internal resistance model with higher accuracy, thereby improving the accuracy of the estimated value of the state of charge of the battery.

[0037] In order to enable those skilled in the art to better understand the solutions of the present application, the following will describe the embodiments of the present application with reference to the drawings in the embodiments of the present application.

[0038] The "first" or "second" mentioned in the present application documents are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. In addition, "comprising" or "having" and any variations thereof mentioned in the application documents are intended to cover non-exclusive inclusion, for example, a process, method, syste...

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Abstract

The invention discloses a method and a device for estimating the state of charge of a battery, and the method and the device are used for improving the accuracy of an estimated value of the state of charge of the battery. The method comprises a step of acquiring charging and discharging current at a current moment, temperature at the current moment, a coulomb electric quantity at the current moment and the state-of-charge value at a previous moment of a to-be-tested battery in real time according to a preset time interval, a step of obtaining the discharge duration of the to-be-tested battery,a step of determining the type of the internal resistance response of the to-be-tested battery at the current moment according to the discharge duration, a step of determining the internal resistancedata of the to-be-tested battery at the current moment according to the type of the internal resistance response at the current moment, the temperature at the current moment, the charging and discharging current at the current moment and the state-of-charge value at the previous moment, a step of determining the unavailable electric quantity of the to-be-tested battery at the current moment according to the internal resistance data at the current moment, the charging and discharging current at the current moment and the temperature at the current moment, and a step of determining the state-of-charge value of the to-be-tested battery at the current moment according to the coulomb electric quantity at the current moment and the unavailable electric quantity at the current moment.

Description

technical field [0001] The present application relates to the field of battery management, in particular to a method and device for estimating the state of charge of a battery. Background technique [0002] The state of charge (SOC) of the battery is one of the main parameters of the battery state, and its value is defined as the ratio of the remaining capacity of the battery to the total capacity of the battery. For the battery management system (battery management system, BMS), it has always been a difficult problem to judge the SOC of the battery. It is difficult to estimate the external parameters, and is affected by various factors such as battery charge and discharge rate, temperature, self-discharge rate, aging life, battery discharge cut-off voltage, and internal resistance; on the other hand, the battery itself It is a very complex electrochemical system, and its internal electrochemical relationship has a nonlinear relationship, which makes it difficult to use the...

Claims

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Application Information

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IPC IPC(8): G01R31/388G01R31/389
CPCG01R31/367G01R31/387G01R31/389G01R31/3842
Inventor 李娟李慧范团宝李阳兴
Owner HUAWEI TECH CO LTD
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