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Battery capacity determination method and device

A battery capacity and determination method technology, applied in the direction of measuring devices, measuring electrical variables, measuring electricity, etc., can solve the problems that the error of the battery model cannot be eliminated, it has not been widely used, and it takes a long time

Active Publication Date: 2020-07-07
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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  • Battery capacity determination method and device
  • Battery capacity determination method and device
  • Battery capacity determination method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0086] see Figure 2a , Figure 2a It is a schematic flowchart of a method for determining a battery capacity provided by an embodiment of the present invention. This method can be applied to scenarios such as battery residual value evaluation and used car evaluation, and mainly realizes the estimation of battery electromotive force. The method can be executed by a device for determining battery capacity, which can be realized by means of software and / or hardware, and generally can 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 in 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 battery of the electric vehicle uploaded by the ch...

Embodiment 2

[0132] see Figure 8 , Figure 8 It is a schematic structural diagram of a device 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 charging and discharging 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 obtain the electric vehicle data 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 connected to the charging and discharging pile. The open circuit voltage of the battery;

[0134] The charging and discharging module 220 is configured to determine a first state of charge SOC corre...

Embodiment 3

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

[0157] A memory 701 storing executable program codes;

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

[0159] Wherein, 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] An embodiment of the present invention discloses a computer-readable storage medium, which stores a computer program, wherein the computer program enables a computer to execute the battery capacity determination method 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 is run on a computer, the computer is made to execute some or a...

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Abstract

The embodiment of the invention discloses a battery capacity determination method and device, and the method comprises the steps: obtaining the open-circuit voltage, uploaded by a charging and discharging pile, of an electric vehicle battery based on the communication relation with the charging and discharging pile; determining a first state of charge SOC corresponding to the open-circuit voltage,and controlling the charging and discharging pile to charge or discharge the battery according to the size of the first SOC; in a set time period after the charging or discharging process is finished, the voltage change process of the battery is obtained through the charging and discharging pile, and the terminal voltage of the battery in the voltage change process is collected; determining an initial electromotive force corresponding to the terminal voltage based on a first function relationship among the terminal voltage of the battery, the polarization internal resistance and the electromotive force; determining an electromotive force range where the initial electromotive force is located, and determining a target electromotive force from the electromotive force range based on an estimation model; and determining the capacity of the battery according to the second SOC corresponding to the target electromotive force. By adopting the technical scheme, the rapidity and accuracy of estimating the battery capacity are improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method and device for determining battery capacity. Background technique [0002] In recent years, with the deepening of the global energy crisis, the depletion of oil resources, and the intensification of air pollution and rising global temperatures, governments and automobile companies generally recognize energy conservation and emission reduction as the main direction of future automobile development. As a new generation of transportation, electric vehicles have incomparable advantages over traditional vehicles in terms of energy saving, 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 less ...

Claims

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Application Information

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IPC IPC(8): G01R31/388G01R31/367G01R31/371
CPCG01R31/388G01R31/367G01R31/371
Inventor 刘海东周正郑岳久郭东旭褚政宇
Owner 北京昇科能源科技有限责任公司