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A method for obtaining residual energy of a battery, a battery management system and an electric vehicle

A technology of residual energy and acquisition method, which is applied in electric vehicles, battery/fuel cell control devices, and measurement of electrical variables, etc., and can solve the problem of inaccurate acquisition of battery residual energy.

Active Publication Date: 2019-03-01
BEIJING CHJ AUTOMOTIVE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Embodiments of the present invention provide a method for obtaining remaining battery energy, a battery management system, and an electric vehicle, so as to solve the problem that existing methods for obtaining remaining battery energy are not accurate enough

Method used

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  • A method for obtaining residual energy of a battery, a battery management system and an electric vehicle
  • A method for obtaining residual energy of a battery, a battery management system and an electric vehicle
  • A method for obtaining residual energy of a battery, a battery management system and an electric vehicle

Examples

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no. 1 example

[0031] see figure 1 , figure 1 It is a flow chart of the method for obtaining the remaining battery energy provided by the embodiment of the present invention, such as figure 1 As shown, the method for obtaining the remaining energy of the battery in the embodiment of the present invention includes the following steps:

[0032] Step 101, detecting the current terminal voltage of the battery.

[0033] The method for obtaining the remaining energy of the battery in the embodiment of the present invention and all subsequent embodiments is applicable to all electric devices that use batteries as the main energy storage power source, such as electric bicycles, electric vehicles, etc. All examples are described with electric vehicles as an example.

[0034] In this step, the detected current terminal voltage of the battery is the current terminal voltage of the battery detected by the battery management system of the electric vehicle when the electric vehicle is running normally....

no. 2 example

[0046] see figure 2 , figure 2 It is a flow chart of the method for obtaining the remaining battery energy provided by the embodiment of the present invention, such as figure 2 As shown, the method for obtaining the remaining energy of the battery in the embodiment of the present invention includes the following steps:

[0047] Step 201 , if the voltage fluctuation range of the battery after the battery stops outputting energy and before the output circuit of the battery is disconnected is less than or equal to a first preset value, then detect the voltage of the first terminal of the battery.

[0048] In the embodiment of the present invention, steps 201 to 203 can be understood as a specific method for obtaining the first mapping relationship between the terminal voltage of the battery and the steady-state open circuit voltage.

[0049] In the embodiment of the present invention, setting the working conditions for obtaining the terminal voltage and the steady-state open...

no. 3 example

[0068] see image 3 , image 3 It is a flow chart of the method for obtaining the remaining battery energy provided by the embodiment of the present invention, such as image 3 As shown, the method for obtaining the remaining energy of the battery in the embodiment of the present invention includes the following steps:

[0069] Step 301. If the voltage fluctuation range of the battery after the battery stops outputting energy and before the output circuit of the battery is disconnected is less than or equal to a first preset value, then detect the voltage of the first terminal of the battery.

[0070] In the embodiment of the present invention, steps 301 to 303 can be understood as a specific method for obtaining the first mapping relationship between the terminal voltage of the battery and the steady-state open circuit voltage.

[0071] In the embodiment of the present invention, setting the working conditions for obtaining the terminal voltage and the steady-state open-cir...

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Abstract

The invention provides a battery residual energy capture method, a battery management system and an electric car. The method comprises the steps of detecting a current terminal voltage of a battery; searching whether the current terminal voltage is recorded in a first mapping relation, acquired in advance, of a terminal voltage of the battery and a steady-state open-circuit voltage; and acquiring the current residual energy of the battery according to the steady-state open-circuit voltage corresponding to the current terminal voltage if the current terminal voltage is recorded in the first mapping relation. In this way, the accurate residual energy at the current terminal voltage is acquired by acquiring the mapping relation, acquired in advance, of the terminal voltage of the battery and the steady-state open-circuit voltage.

Description

technical field [0001] The present invention relates to the technical field of battery management, in particular to a method for obtaining remaining battery energy, a battery control system and an electric vehicle. Background technique [0002] The battery is one of the main energy storage power sources of many electric devices, such as electric vehicles. In order to ensure the stable operation of the entire battery system, it is necessary to monitor the parameters of the battery, especially the remaining energy of the battery in real time. The traditional method for obtaining the remaining energy of the battery mainly includes the time-current-voltage integration method, which has the following disadvantages: due to the existence of hysteresis voltage, there is a certain difference between the actual measured voltage value and the real value; the current used to detect the current There is an error in the sensor, and there is a certain difference between the actual measured...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L3/12B60L58/12G01R31/36
CPCB60L3/12B60L58/10B60L2240/547G01R31/3648G01R31/3835Y02T10/70
Inventor 马东辉周瑾
Owner BEIJING CHJ AUTOMOTIVE TECH CO LTD