A method for estimating the remaining charging time of a power battery

A power battery and charging time technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as poor user experience, low estimation accuracy, and inaccurate estimation of remaining charging time, and achieve the goal of improving user experience Effect

Active Publication Date: 2022-04-01
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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  • A method for estimating the remaining charging time of a power battery

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0058] 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 method for estimating the remaining charging time of a power battery, which can adapt to different working conditions such as DC charging, AC charging, charging heating, etc., and is suitable for power battery packs equipped with a cooling system or not equipped with a cooling system; The output capability updates the remaining charging time in real time, and has the redundant estimation ability when the output current of the charging pile is abnormal; it can update the remaining charging time in real time according to the change of the charging target SOC value, and is compatible with the variable function of the charging target SOC value; it can accurately estimate The remaining charging time of the power battery provides accurate reference for the user to use the car and improves the user experience.

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...

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Application Information

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Patent Type & Authority Patents(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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