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Remaining charging time estimation method of power battery

A power battery and charging time technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of not considering the change of the SOC value of the output capacity of the charging pile, inaccurate estimation of the remaining charging time, and low estimation accuracy.

Active Publication Date: 2020-05-12
深蓝汽车科技有限公司
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Problems solved by technology

[0003] At present, the traditional method for estimating the remaining charging time of the power battery is basically obtained by dividing the charging capacity of the power battery by the actual charging current. The estimation accuracy is not high, and the user experience is not strong.
[0004] CN108646190A discloses a method, device and equipment for estimating the remaining charging time of a battery, which can estimate the remaining charging time of the battery, but it does not consider the output capacity of the charging pile and the change of the charging target SOC value. If the output capacity of the charging pile cannot meet the requirements of each The charging demand current or charging target SOC value changes in the charging phase are still processed in the same estimation method, which will lead to inaccurate estimation of the remaining charging time

Method used

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  • Remaining charging time estimation method of power battery
  • Remaining charging time estimation method of power battery
  • Remaining charging time estimation method of power battery

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Embodiment Construction

[0061] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0062] The method for estimating the remaining charging time of the power battery in this embodiment is executed by the controller. The controller can obtain the charging status flag, the power battery temperature at each moment, the lowest temperature of the power battery, the heating state flag, the power battery cell voltage at each moment, the power battery SOC value at each moment, and the charging target SOC value at each moment 1. The actual charging current of the charging stage of the power battery; the acquisition method of each signal is the prior art. The storage module of the controller stores the preset temperature threshold Tem 阈 , preset current threshold I 阈 , preset time T 阈 , the total number of preset charging stages n, the calibration value of the battery charging capacity C ap , heating target temperature Tem tar , The temperature rise rate...

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Abstract

The invention discloses a remaining charging time estimation method of a power battery. The method can adapt to different working conditions such as direct current charging, alternating current charging, charging heating and the like and is suitable for a power battery pack equipped with a cooling system and a power battery pack not equipped with a cooling system. The remaining charging time can be updated in real time according to the output capacity of a charging pile, and the redundancy estimation capacity is achieved when the output current of the charging pile is abnormal; the remaining charging time can be updated in real time according to the change of the charging target SOC value, and the charging target SOC value variable function is compatible; and the remaining charging time ofthe power battery can be accurately estimated, an accurate reference is provided for a user to use the vehicle, so that the user experience is improved.

Description

technical field [0001] The invention belongs to the field of battery management systems for new energy vehicles, and in particular relates to a method for estimating the remaining charging time of a power battery. Background technique [0002] With the gradual deterioration of the global climate, the increase of urban air pollution and the excessive consumption of oil resources, more and more people in the automotive field are turning their attention to electric vehicles. The power battery is an important part of the electric vehicle. The charging time and remaining charging time estimation during the charging process of the power battery are very important to the user experience. Estimated and accurate remaining charging time can provide users with appropriate guidance on car use, so that users can reasonably arrange car use according to their own conditions, reduce unnecessary waiting, and improve user experience. [0003] At present, the traditional method for estimating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382G01R31/367
CPCG01R31/382G01R31/367
Inventor 陈建行洪木南朱骞丁灿赵立波曾杨
Owner 深蓝汽车科技有限公司
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