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Battery power attenuation degree detection method

A technology of attenuation degree and detection method, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of influence, high detection inaccuracy, etc., and achieve the effect of improving accuracy, simple and direct judgment, and convenient judgment

Active Publication Date: 2017-05-10
SHANGHAI COTECH AUTOMOTIVE ENG CORP LTD
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Problems solved by technology

[0004] This method of determining power decay has two problems: first, the resistance is closely related to temperature, and the temperature is usually only the temperature of the entire module, not the temperature of the battery surface, which has high detection imprecision and is also affected by Effect of noise
Second, the current battery life testing is done online, and it is difficult to determine that the resistance estimate at a certain point in time must be accurate. Therefore, using the resistance estimate at a point to determine the degree of battery power attenuation has great limitations

Method used

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0045] Such as figure 2 The equivalent circuit diagram of the battery is shown, and the general battery dynamic process follows the Arrehenius equation: the higher the temperature, the faster the electrochemical process in the battery, and the lower the corresponding resistance. Regardless of the extent to which the battery is used, the relationship between battery resistance and temperature remains an exponential relationship:

[0046] R=R 0 × e β / τ (1)

[0047] Here, R 0 is a constant, τ is the battery temperature (unit: Kelvin), and β is an attenuation factor that determines...

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Abstract

The invention relates to a battery power attenuation degree detection method for detecting attenuation degree of power batteries in an electromobile. The method includes following steps: judging whether the power batteries are within an effective range or not at current moment, if yes, detecting resistance value Rj of the power batteries at the current moment, and if not, returning to continue judging; according to the resistance value Rj, calculating and storing resistance factor betaj of the power batteries at the current moment; judging whether the stored resistance factors reach estimated quantity N, if yes, entering a next step, and if not, returning to the first step; calculating minimum mean square error of all stored resistance factors betaj to obtain a minimum mean square resistance factor beta; calculating an attenuation degree estimated value epsilon according to the minimum mean square resistance factor beta; according to the attenuation degree estimated value epsilon, judging attenuation degree of the power batteries. Compared with the prior art, the method has the advantages of high detection accuracy, freeness of noise influence and few detection errors.

Description

technical field [0001] The invention relates to the field of automobile batteries, in particular to a method for detecting the power attenuation degree of the battery. Background technique [0002] There are many high-voltage electrical components in electric vehicles, such as high-voltage battery packs, high-voltage junction boxes, motor controllers, air-conditioning controllers, DC / DC, chargers, etc., and power batteries are one of the most critical components. The performance of power batteries usually weakens with the degree of use and the time of use and storage. This weakening has two manifestations: battery capacity (capacity) changes (decreases), and charge and discharge power capacity changes (decreases) under the same degree of storage and temperature. In the industry, for battery capacity, a loss of more than 20% generally indicates that the battery no longer has sufficient capacity. [0003] A sign of battery power decay is usually an increase in battery resist...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/392
Inventor 李勇华张志伟
Owner SHANGHAI COTECH AUTOMOTIVE ENG CORP LTD
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