Method for estimating residual capacity of battery pack of electric car

A technology for electric vehicles and residual capacity, which is applied to electric vehicles, battery/fuel cell control devices, power consumption devices, etc., can solve the problem of battery pack capacity estimation, etc., and achieve the effect of improving safe use

Inactive Publication Date: 2019-05-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0003] A method for estimating the remaining capacity of the electric vehicle battery pack proposed by the present inventio

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  • Method for estimating residual capacity of battery pack of electric car

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0023] Such as figure 1 As shown, the method for estimating the remaining capacity of the electric vehicle battery pack described in this embodiment includes:

[0024] S1. Obtain the remote monitoring data of the electric vehicle during the operation of the whole vehicle;

[0025] S2. Extract the battery pack temperature, SOC, running time, running mileage, and running status from the remote monitoring data for comparison;

[0026] S3. Estimate the attenuation and operating life of the battery pack of the electric vehicle according to the comparis...

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Abstract

The invention provides a method for estimating the residual capacity of a battery pack of an electric car. The technical problem that a battery pack of an existing electric car cannot be subjected tocapacity estimation can be solved. The method comprises the following steps that S100, remote monitoring data of the electric car in the whole car operation process are obtained; S200, the battery pack temperature, the SOC, the operation time, the operation mileage and the operation state in the remote monitoring data are extracted and compared; and S300, according to the comparison result in thestep S200, the attenuation life and the operation life of the battery pack of the electric car are estimated by combining cycle life data of selected battery cells of the whole car and battery cell calendar life data. According to the method for estimating the residual capacity of the battery pack of the electric car, the residual life of the battery pack is estimated according to the actual operation state of the car, thus the current health state of the battery pack can be visually reflected, and safe use of lithium ion batteries is further enhanced.

Description

technical field [0001] The invention relates to the technical field of electric vehicle batteries, in particular to a method for estimating the remaining capacity of an electric vehicle battery pack. Background technique [0002] At present, the capacity of battery packs on electric vehicles is calibrated through a complete charge and discharge test before leaving the factory, which is marked as the rated capacity of the battery pack. During the operation of the battery pack, there will be a certain capacity attenuation, which is mainly related to the service time, cycle times, operating conditions and ambient temperature of the vehicle battery pack. However, the estimation of battery pack capacity in electric vehicles is necessarily related to the cruising range and SOC estimation of electric vehicles. However, because customers cannot conduct a complete charge and discharge test during the use of electric vehicles, this makes it difficult to estimate the current capacity ...

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Application Information

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IPC IPC(8): B60L3/12B60L58/12B60L58/16
CPCY02T10/70
Inventor 杨思文宋红芳丁绍玉刘大军
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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