A method for limiting power of an electric vehicle

An electric vehicle, power-limiting technology, applied in electric vehicles, vehicle components, vehicle energy storage, 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
CN108340801BActive Publication Date: 2020-03-24ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
Publication Date
2020-03-24

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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.
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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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