Actual capacity estimation method of lithium ion battery for pure electric automobile

A lithium-ion battery, pure electric vehicle technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of non-compliance, requiring a lot of time, actual capacity reduction, etc., to achieve good controllability and stability, The effect of good current controllability and stability, and ample data processing time

Inactive Publication Date: 2010-05-12
HUIZHOU EPOWER ELECTRONICS +1
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  • Abstract
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Problems solved by technology

However, when the battery is actually used in a pure electric vehicle, it is not fully charged and fully discharged according to a fixed working condition like the battery cycle test, so the actual capacity is not easy to obtain, so in actual use, the rated capacity is often used instead of the actual capacity for SOC. (State Of Charge, state of charge) estimation; however, with the increase of cycle times and usage time, the battery will gradually age and the actual capacity will

Method used

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Embodiment Construction

[0014] In order to facilitate the understanding of those skilled in the art, the structural principle of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings:

[0015] The method of obtaining the actual capacity of the daily lithium battery is generally obtained by fully charging and discharging. Although this method is simple and accurate, it requires a lot of time and wastes energy, and is not suitable for pure electric vehicles.

[0016] The method that the embodiment of the present invention proposes comprises the following steps:

[0017] a. During the online charging process, the change value of the remaining battery capacity is obtained through the vehicle battery management system;

[0018] b. Before the battery is charged and after the battery is running, the first state of charge SOC1 of the battery is obtained through the vehicle battery management system by charging a part of the battery ...

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Abstract

The invention relates to an actual capacity estimation method of a lithium ion battery for a pure electric automobile, comprising the following steps of: a. acquiring a variable value of the residual capacity of the battery through an automotive battery management system during the online charging process; b. before battery charging and after battery operating, acquiring a first state charge state SOC1 of the battery by charging a part of electric quantity through the automotive battery management system; c. after the charging is finished, acquiring a second state charge state SOC2 of the battery through the automotive battery management system; and d. acquiring the ratio between the variable value of the residual capacity of the battery in the step a and the difference value of two charge states of the battery, namely, acquiring the actual capacity value of the battery. Compared with the prior art, the invention has the following advantages that: (1) the current controllability and the current stability during the charging are better; (2) the data processing time is plenty; and (3) the advantage (1) and the advantage (2) can be finished during the single charging.

Description

technical field [0001] The invention relates to a method for estimating the actual capacity of a lithium-ion battery for pure electric vehicles. Background technique [0002] Lithium-ion battery has become an ideal power source for the new generation of electric vehicles due to its excellent performance. When it is used in electric vehicles, it is generally monitored by a dedicated battery management system to improve the controllability and stability of the battery. However, when the battery is actually used in a pure electric vehicle, it is not fully charged and fully discharged according to a fixed working condition like the battery cycle test, so the actual capacity is not easy to obtain, so in actual use, the rated capacity is often used instead of the actual capacity for SOC. (State Of Charge, state of charge) estimation; however, as the number of cycles and usage time increase, the battery will gradually age and the actual capacity will decrease. If it cannot be upda...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 冯大明刘飞阮旭松张维戈王占国文锋
Owner HUIZHOU EPOWER ELECTRONICS
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