Method suitable for estimating residual discharge capacity of battery under dynamic current working conditions

A residual discharge and dynamic current technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., to achieve the effect of accurate residual capacity estimation results

Active Publication Date: 2014-07-02
BEIJING KEY POWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large number of tests on lithium-ion batteries have shown that if the current changes more dynamically, the remaining capacity of the battery does not match the results of the Proctor's equation well, so there are certain problems in actual vehicle applications.

Method used

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  • Method suitable for estimating residual discharge capacity of battery under dynamic current working conditions
  • Method suitable for estimating residual discharge capacity of battery under dynamic current working conditions
  • Method suitable for estimating residual discharge capacity of battery under dynamic current working conditions

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Embodiment Construction

[0019] 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.

[0020] The remaining discharge capacity of the battery at a certain moment refers to the accumulated charge released by the battery during the period from this moment until the terminal voltage reaches the discharge cut-off voltage. Since the discharge cut-off time of the battery cannot be known during the discharge process, the remaining discharge capacity can only be predicted by estimating the state of the battery.

[0021] The method for estimating the remaining discharge capacity of a battery applicable to dynamic current co...

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Abstract

The invention provides a method suitable for estimating residual discharge capacity of a battery under dynamic current working conditions. The method includes the steps that the current measured value of the battery is acquired, and a time period meeting preset conditions is selected according to the measured value to serve as a recognition period; the voltage change at the battery end and the corresponding current difference accumulation electric quantity in the current recognition period are calculated, and the current dynamic voltage change ratio is obtained; the current residual discharge capacity of the battery is determined according to the dynamic voltage change ratio and the corresponding relation between the dynamic voltage change ratio and the residual discharge capacity, wherein the corresponding relation is obtained through calibration. The method is simple in calculation and high in accuracy.

Description

technical field [0001] The invention relates to the field of electric vehicles and battery state estimation, in particular to a method for estimating the remaining discharge capacity of a battery suitable for dynamic current working conditions. Background technique [0002] Compared with traditional fuel vehicles, electric vehicles have great advantages in driving economy and environmental friendliness. However, the driving range of electric vehicles is not easy to estimate, and it is easy to cause users' mileage anxiety. The mileage of an electric vehicle depends on the remaining discharge energy of the power battery and the energy consumption of the vehicle. The remaining discharge energy of the battery is affected by the future average discharge voltage and the remaining discharge capacity of the battery. Since the discharge voltage curve of the battery is relatively gentle and the average discharge voltage in the future is relatively fixed, the estimation accuracy of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘光明欧阳明高卢兰光李建秋
Owner BEIJING KEY POWER TECH
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