Anti-condensation dehumidification method and power battery system thereof

Abstract

The invention provides an anti-condensation dehumidification method and a power battery system thereof. The anti-condensation dehumidification method comprises the steps that parameters including the temperature of the inner wall of the power battery system and the temperature, humidity and pressure of the internal environment of a power battery are collected in real time; the dew point temperature is calculated according to the collected parameters; the conditions for determining whether dehumidification is started or not are as follows: when the inner wall temperature is greater than the dew point temperature, or when the inner wall temperature is smaller than or equal to the dew point temperature, the real-time insulation resistance value is larger than the set insulation resistance value, and the internal insulation resistance value variation dR / dt is larger than or equal to 0, dehumidification is not started; when the inner wall temperature is less than or equal to the dew point temperature, the real-time insulation resistance value is greater than the set insulation resistance value, and the internal insulation resistance value variation dR / dt is less than 0, or when the inner wall temperature is smaller than or equal to the dew point temperature and the real-time insulation resistance value is smaller than the set insulation resistance value, dehumidification is started; and in the dehumidification state, the inner wall temperature and the real-time insulation resistance value are collected, and whether dehumidification is stopped or not is determined according to the collected temperature. The power battery system is high in integration level and high in environmental adaptability, does not affect the sealing of the power battery, and has good anti-condensation and dehumidification effects.

Description

technical field [0001] The invention mainly relates to the dehumidification of power batteries, in particular to an anti-condensation dehumidification method and a power battery system thereof. Background technique [0002] Condensation is a natural phenomenon. If the absolute humidity of the air is kept constant and the air temperature is lowered, the humidity in the air will reach saturation when the temperature drops to a certain value, and if the temperature continues to drop, the moisture in the air will precipitate. This phenomenon of liquid water precipitation is called condensation. The dew point temperature refers to the temperature at which the relative humidity of the air can reach 100% under the premise that the moisture content and atmospheric pressure remain unchanged. [0003] For closed products, the condensation phenomenon mainly includes two situations. One is that the surface temperature of the shell is lower than the external ambient temperature during t...

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Problems solved by technology

[0005] First, when condensation drips onto some non-conductive metal surfaces, it will interact with dust and other impurities on the metal surface to accelerate the corrosion of parts;

[0006] Second, condensation dripping on some conductive metal parts will cause the electrical isolation between the metals to fail, causing short circuits or even explosions of electrical components; Shorten the service life of electrical components;

[0007] Third, condensation drops onto the surface of some insulating parts. On the one hand, the electrical insulation performance of the insulating material will be reduced or even invalidated. On the other hand, the long-term high-humidity environment will make the insulating material more prone to mildew and other undesirable phenomena;

[0008] Fourth, the high-humidity environment formed by condensation will greatly reduce the insulation performance of the air medium, which will lead to insulation failure.

However, this solution still has the following defects that cannot be solved. First, the desiccant replacement and maintenance costs are high, including material costs and labor costs. The time is also different; in the end, the responsible person for desiccant replacement is uncertain, and there is no definition of the responsible person for desiccant replacement and maintenance. If consumers are responsible for replacing the desiccant, it will lead to consumer resentment and affect the acceptance of electric vehicles

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