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Power limiting method for electric vehicle

An electric vehicle and power-limiting technology, which is applied in the direction of electric vehicles, vehicle energy storage, electric traction, etc., can solve the problems of battery power output interruption, small protection voltage, and battery instantaneous input/output power, etc., to ensure power performance Effect

Active Publication Date: 2018-07-31
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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AI Technical Summary

Problems solved by technology

In the prior art, the power of the vehicle under different working conditions is mainly obtained through the method of looking up the table, but the instantaneous input / output power of the battery is relatively large through the method of looking up the table, which may cause the battery to reach the maximum / minimum protection when the battery still has a certain amount of power. voltage, thereby interrupting the battery power output

Method used

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  • Power limiting method for electric vehicle
  • Power limiting method for electric vehicle
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Embodiment Construction

[0059] In order to enable those skilled in the art to further understand the features and technical contents of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings and implementation methods.

[0060] Such as figure 1 Shown is the first flow chart of the electric vehicle power limit in the embodiment of the present invention, including the following steps:

[0061] Step 100: start.

[0062] Step 101: Obtain the SOC of the battery, the total voltage of the battery, and the lowest temperature of the cells in the battery.

[0063] It should be noted that the embodiment of the present invention can be controlled by the battery controller in the battery management system or the vehicle controller of the vehicle. It is a conventional technical means, but in the vehicle, since the vehicle controller and the battery management system are connected through the CAN bus, the vehicle controller c...

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Abstract

The invention relates to a battery management system, in particular to a power limiting method for an electric vehicle. The power limiting method comprises the steps that the SOC of a battery, the total voltage of the battery and the lowest temperature of a cell in the battery are obtained; first power is obtained according to the SOC, the total voltage of the battery and the lowest temperature ofthe cell in the battery; the lowest voltage of the cell is obtained; whether the first power meets the power limiting condition of the cell or not is detected according to the lowest voltage of the cell and the lowest temperature of the cell, if so, second power is obtained according to the variation of the lowest voltage of the cell; and the minimum between the first power and the second power is used as the power output by a control motor. According to the power limiting method for the electric vehicle, the power performance is guaranteed when the voltage of a power battery is high, and itis guaranteed that powder failure does not appear on a vehicle when the voltage of the power battery is low.

Description

technical field [0001] The invention relates to a battery management system, in particular to a power limiting method for an electric vehicle. Background technique [0002] In response to the energy crisis and climate warming in the past few years, many countries have vigorously developed energy-saving emission reduction and low-carbon economy. As a new generation of green energy, lithium-ion batteries have the characteristics of small self-discharge, high voltage, high energy density, and good cycle performance, so they are widely used in new energy vehicles. [0003] In electric vehicles, the core functions of the battery include: SOC (the state of charge, state of charge of the battery), SOH (the state of function, functional state), SOF (the state of health, state of life), and the accuracy of battery core function estimation and No, it directly affects the mileage, power performance, and battery life of electric vehicles. It is one of the core technologies in the devel...

Claims

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Application Information

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IPC IPC(8): B60L11/18
CPCB60L58/10Y02T10/70
Inventor 徐钦建秦李伟夏顺礼赵久志徐爱琴李忠刘微
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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