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Method and device for determining battery capacity

A technology of battery capacity and determination method, applied in measurement devices, measurement of electrical variables, measurement of electricity, etc., can solve the problems of taking a long time, not being widely used, and unable to eliminate battery model errors, etc., to improve rapidity and accuracy. sexual effect

Active Publication Date: 2022-05-24
北京昇科能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the current error method is prone to cumulative errors, and the prediction results of the neural network method are greatly affected by the samples. The Kalman filter method is currently the most widely used method. This method weakens the influence of white noise and output errors, but Errors in the battery model itself cannot be eliminated
As for the open circuit voltage method, it has not been widely used because it takes a long time

Method used

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  • Method and device for determining battery capacity
  • Method and device for determining battery capacity
  • Method and device for determining battery capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] see Figure 2a , Figure 2a A schematic flowchart of a method for determining a battery capacity provided by an embodiment of the present invention. This method can be used in scenarios such as battery residual value evaluation and used car evaluation, and mainly realizes the estimation of battery electromotive force. The method can be performed by a device for determining battery capacity, which can be implemented by software and / or hardware, and can generally be integrated in a cloud server, and there is a communication connection between the cloud server and the charging and discharging pile. like Figure 2a As shown, the method provided by this embodiment specifically includes:

[0087] 110. When the electric vehicle to be estimated is connected to the charging and discharging pile, based on the communication relationship with the charging and discharging pile, obtain the open circuit voltage of the electric vehicle battery uploaded by the charging and dischargin...

Embodiment 2

[0132] see Figure 8 , Figure 8 This is a schematic structural diagram of an apparatus for determining battery capacity provided by an embodiment of the present invention. like Figure 8 As shown, the device includes: an open circuit voltage acquisition module 210, a charge and discharge module 220, a terminal voltage acquisition module 230, an initial electromotive force determination module 240, a target electromotive force determination module 250 and a battery capacity determination module 260, wherein,

[0133] The open circuit voltage acquisition module 210 is configured to acquire the electric vehicle uploaded by the charging and discharging pile based on the communication relationship with the charging and discharging pile when the electric vehicle to be estimated is in a connected state with the charging and discharging pile The open circuit voltage of the battery;

[0134] The charging and discharging module 220 is configured to determine the first state of charg...

Embodiment 3

[0156] see Figure 9 , Figure 9 This is a schematic structural diagram of a cloud server according to an embodiment of the present invention. like Figure 9 As shown, the cloud server may include:

[0157] a memory 701 storing executable program code;

[0158] a processor 702 coupled to the memory 701;

[0159] The processor 702 invokes the executable program code stored in the memory 701 to execute the method for determining the battery capacity provided by any embodiment of the present invention.

[0160] The embodiment of the present invention discloses a computer-readable storage medium, which stores a computer program, wherein the computer program causes a computer to execute the method for determining the battery capacity provided by any embodiment of the present invention.

[0161] The embodiment of the present invention discloses a computer program product, wherein, when the computer program product runs on a computer, the computer is made to execute part or all ...

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Abstract

The embodiment of the present invention discloses a method and device for determining battery capacity. The method includes: based on the communication relationship with the charging and discharging pile, obtaining the open circuit voltage of the electric vehicle battery uploaded by the charging and discharging pile; determining the first open circuit voltage corresponding to the open circuit voltage A state of charge SOC, and control the charging and discharging pile to charge or discharge the battery according to the size of the first SOC; within a set period of time after the charging or discharging process is completed, the voltage change process of the battery is obtained through the charging and discharging pile, and Collect the terminal voltage of the battery during the voltage change process; determine the initial electromotive force corresponding to the terminal voltage based on the first functional relationship between the terminal voltage, polarization internal resistance and electromotive force of the battery; determine the electromotive force range where the initial electromotive force is located, and based on the estimated The model determines the target electromotive force from the electromotive force range; determines the capacity of the battery according to the second SOC corresponding to the target electromotive force. By adopting the above technical solution, the rapidity and accuracy of battery capacity estimation are improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery capacity determination method and device. Background technique [0002] In recent years, with the deepening of the global energy crisis, the depletion of oil resources, and the aggravation of air pollution and rising global temperatures, governments and auto companies have generally recognized that energy conservation and emission reduction are the main directions for future auto development. As a new generation of transportation, electric vehicles have the incomparable advantages of traditional vehicles in terms of energy saving and emission reduction, and reducing human dependence on fossil energy. Lithium-ion power batteries are widely used in electric vehicles due to their high energy density, long cycle life, high safety, low pollution, low self-discharge rate, and no memory effect. [0003] Generally speaking, when the battery capacity is reduced to les...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/388G01R31/367G01R31/371
CPCG01R31/388G01R31/367G01R31/371
Inventor 刘海东周正郑岳久
Owner 北京昇科能源科技有限责任公司