Power battery pulse heating reliability test method

Abstract

The invention relates to a power battery pulse heating reliability test method, which can verify the influence of pulse heating on the capacity fading of a power battery. The method comprises the steps that S1, a rack system is built, and the initial capacity of a power battery is collected, and the steps from S2 to S6 are cyclically executed; S2, the upper computer controls a 12V low-voltage power supply to perform low-voltage power-on; S3, the upper computer judges whether a pulse heating function is started or not; S4, if yes, the upper computer controls to start pulse heating of the power battery; S5, if the upper computer judges that the pulse heating function is not started any more, the upper computer controls to stop pulse heating of the power battery, and the current capacity of the power battery is acquired; S6, the upper computer judges the attenuation percentage of the current capacity of the power battery relative to the initial capacity of the power battery, and judges whether the attenuation percentage is greater than or equal to a preset percentage; and S7, if yes, the upper computer controls the 12V low-voltage power supply to be powered off so as to stop the test, and the total number of times of pulse heating of the power battery in the test process is recorded.

Description

technical field [0001] The invention belongs to the field of new energy power batteries, and in particular relates to a power battery pulse heating reliability test method. Background technique [0002] With the advancement of new energy technology and the state's encouragement and subsidy policies, market users are increasingly accepting lithium-ion electric vehicles, and electric vehicles have begun to appear in streets and alleys across the country. Our country has a vast territory, and the climate and environment vary greatly from place to place. For example, the temperature in North China is around -10°C, while the average winter temperature in Northeast China is -20°C. For Northeast users who purchase electric vehicles, the lowest temperature of electric vehicle batteries is around -20°C every morning when using the car, and the ambient temperature has a great impact on the performance of power batteries. In addition, the battery temperature is too low, which also cau...

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Problems solved by technology

[0003] However, most of the existing battery thermal management strategies use liquid heat or heating film, the heating rate is too small, and the user waits too long for heating, which cannot meet the needs of users; while DC charging and discharging heating will cause the battery to easily decompose lithium, which is safe. risk

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