Identifying method and system for battery capacity fading mechanism

A technology of attenuation mechanism and battery capacity, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as damage to batteries

Active Publication Date: 2014-04-02
BEIJING KEY POWER TECH
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But for the battery on the actual electric vehicle, t...

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  • Identifying method and system for battery capacity fading mechanism
  • Identifying method and system for battery capacity fading mechanism
  • Identifying method and system for battery capacity fading mechanism

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Embodiment Construction

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0033] In order to enable those skilled in the art to better understand the present invention, the applicant first briefly introduces the decay mechanism of the battery and its identification technology.

[0034] The vehicle power battery usually used in the actual electric vehicle, its discharge condition is determined by the operation condition of the real vehicle, which is often more complicated, and its charging is usually fully charged at a charging pile or garage at night at a slow speed. Charging is usually a small rate co...

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Abstract

The invention provides an identifying method for a battery capacity fading mechanism. The method comprises the steps of sampling and recording the charging capacity C and voltage V of a battery in the constant current charging process with a preset frequency to obtain a C-V curve; counting to obtain a V-dQ/dV curve by using a point counting method according to the C-V curve; comparing the V-dQ/dV curves corresponding to different circular charging and discharging times of the battery and analyzing the battery capacity fading mechanism. By using the constant current charging voltage curve, the capacity increment curve of the battery is obtained by fast calculating through a counting method, the internal condition of the battery is obtained in a non-damage mode, the capacity fading condition of the battery is more comprehensively learned, and the internal mechanism of the battery capacity fading is identified. The invention also provides an identifying system for the battery capacity fading mechanism.

Description

technical field [0001] The invention belongs to the technical field of battery health state estimation, and in particular relates to a method and system for identifying a battery capacity decay mechanism. Background technique [0002] As a new energy technology, battery technology is developing very rapidly, especially lithium-ion batteries, which have been widely used in electric vehicles, energy storage stations and other fields. However, with the cycle of charging and discharging of the battery, the battery will gradually age, the performance will gradually decline, the capacity will gradually decrease, and the internal resistance will gradually increase. At present, the battery management system mainly focuses on the change of the battery capacity, but for the battery capacity The mechanism of attenuation has received less attention. [0003] The attenuation of the capacity of the battery may be caused by the loss of the active material of the positive electrode of the ...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 韩雪冰欧阳明高卢兰光李建秋
Owner BEIJING KEY POWER TECH
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