Control method for dehumidification of energy storage electric cabinet

Abstract

The invention relates to the technical field of energy storage electric cabinets, and provides an energy storage electric cabinet dehumidification control method which comprises the following steps: 1, collecting the temperature of a cold source, the environment temperature and the environment humidity, and sending the temperature, the environment temperature and the environment humidity to a controller; 2, the controller calculates a relative humidity gap value for starting dehumidification and a relative humidity gap value for stopping dehumidification according to the collected cold source temperature and the collected environment temperature and sends the relative humidity gap value and the relative humidity gap value to a corresponding register of the dehumidifier; and thirdly, the dehumidifier automatically operates according to the humidity value sent by the controller. The system can fully follow the environment change and the target demand change, the condensation phenomenon in the cabin can be avoided, meanwhile, excessive operation of the dehumidifier cannot be caused, and the dehumidification demand in the cabin under different environment conditions is fully met.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage electric cabinets, and in particular to a dehumidification control method for an energy storage electric cabinet. Background Art

[0002] At present, most chemical energy storage cabinets need to control the battery temperature, and additional temperature control measures are needed, such as using air-cooled air conditioners or liquid cooling units to cool the battery cells. When the temperature of the cooling medium is low, and the ambient temperature near the electric box and the cooling circuit is high and the humidity is high, condensation will occur on the low-temperature surfaces of the air duct, cooling pipe, water-cooled plate, battery pack shell, etc. As the condensation continues, the condensation will become more serious, and the small water droplets on the surface will gather into large water droplets and drip from the surface. The dripping water droplets will create a short-circuit risk for electrical components in the cabinet, such as terminal blocks. At the same time, it will cause the electrical insulation performance to deteriorate. Once the insulation is damaged, it may cause a short circuit in the line, generate an arc, damage electrical equipment, and even cause a fire. At the same time, the condensed water contains dissolved impurities, which will accelerate the electrochemical corrosion process of the metal, reduce the performance of the components, and shorten the service life.

[0003] At present, most energy storage cabinets have added dehumidifiers to solve the condensation problem in the cabinet. However, the control strategy is rigid, and only the upper and lower limits of relative humidity are preset, which is quite different from the actual application scenario. Because the dew point on the device is related to the body temperature, as well as the ambient temperature and humidity, it will cause condensation or over-operation as the ambient temperature and usage scenario change, resulting in various risks due to condensation. At the same time, the frequent use of the dehumidifier will affect the life of the dehumidifier. Summary of the invention

[0004] The present invention provides a control method for dehumidification of an energy storage cabinet, which can overcome certain defects of the prior art.

[0005] A method for controlling dehumidification of an energy storage cabinet according to the present invention comprises the following steps: 1. Collect the cold source temperature, ambient temperature and ambient humidity, and send them to the controller; 2. The controller calculates the relative humidity threshold for turning on dehumidification and the relative humidity threshold for turning off dehumidification according to the collected cold source temperature and the collected ambient temperature, and sends them to the corresponding register of the dehumidifier; 3. The dehumidifier runs automatically according to the humidity value sent by the controller.

[0006] As a preferred embodiment, the relative humidity threshold for the dehumidifier to start dehumidification is the device's lowest target temperature T d , ambient temperature T and local atmospheric pressure P 0 The function is as follows: F max =f(T 0 , Td , P 0 ); F max The relative humidity threshold for turning on the dehumidifier; The above function is inversely deduced from the air dew point temperature. When the atmospheric pressure is fixed, the formula is as follows: ; C is the redundancy correction value.

[0007] As a preference, the relative humidity threshold for the dehumidifier to turn off dehumidification is: F min =F max -ΔF F min is the relative humidity cutoff value at which the dehumidifier is turned off; ΔF is the relative humidity hysteresis value; the relative humidity hysteresis value ΔF is selected based on the volume of the space to be dehumidified, the cavity sealing performance and the equipment operation cycle.

[0008] The present invention can fully follow the changes in the environment and the changes in target requirements, which can not only ensure that condensation does not occur in the cabin, but also does not cause excessive operation of the dehumidifier, thereby fully meeting the dehumidification requirements in the cabin under different environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The figure is a flow chart of a method for controlling dehumidification of an energy storage cabinet in an embodiment. DETAILED DESCRIPTION

[0010] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it. Example

[0011] like Figure 1 As shown, this embodiment provides a control method for dehumidification of an energy storage cabinet, which includes the following steps: 1. Collect the cold source temperature, ambient temperature and ambient humidity, and send them to the controller.

[0012] 2. The controller calculates the relative humidity threshold for turning on dehumidification and the relative humidity threshold for turning off dehumidification based on the collected cold source temperature and the collected ambient temperature, and sends them to the corresponding register of the dehumidifier.

[0013] 3. The dehumidifier runs automatically according to the humidity value sent by the controller.

[0014] This embodiment automatically adjusts the start and stop humidity threshold of the dehumidifier by performing logical control on the cold source temperature, the current air temperature and the current humidity. The relative humidity threshold at which the dehumidifier starts dehumidification is the device's lowest target temperature T d, (cabin) ambient temperature T and local atmospheric pressure P 0 The function is as follows: F max =f(T 0 , T d , P 0 ); F max is the relative humidity threshold when the dehumidifier is turned on; for liquid cooling system, T d is the outlet temperature of the liquid cooling unit. If the altitude of the equipment remains unchanged, P 0 is a constant.

[0015] The above function is inversely deduced from the air dew point temperature. When the atmospheric pressure is fixed, the formula is as follows: ; C is the redundancy correction value.

[0016] The relative humidity limit when the dehumidifier is turned off is: F min =F max -ΔF F min is the relative humidity threshold at which the dehumidifier is turned off; ΔF is the relative humidity hysteresis value; the relative humidity hysteresis value ΔF is selected based on the volume of the space to be dehumidified, the cavity sealing performance and the equipment operation cycle, and is generally set to: 5~10%.

[0017] Relative humidity is the ratio of the absolute humidity of moist air to the maximum absolute humidity that can be reached at the same temperature.

[0018] This embodiment can fully follow the changes in the environment and the changes in target requirements, and can not only ensure that condensation does not occur in the cabin, but also does not cause excessive operation of the dehumidifier, thereby fully meeting the dehumidification requirements in the cabin under different environmental conditions.

[0019] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A control method for dehumidification of an energy storage cabinet, characterized in that: The following steps are involved:

1. Collect the cold source temperature, ambient temperature and ambient humidity, and send them to the controller; 2. The controller calculates the relative humidity threshold for turning on dehumidification and the relative humidity threshold for turning off dehumidification according to the collected cold source temperature and the collected ambient temperature, and sends them to the corresponding register of the dehumidifier; 3. The dehumidifier runs automatically according to the humidity value sent by the controller.

2. A method for controlling dehumidification of an energy storage cabinet according to claim 1, characterized in that: The relative humidity threshold for the dehumidifier to start dehumidification is the device's minimum target temperature T d , ambient temperature T and local atmospheric pressure P0, as follows: F max =f(T0,T d ,P0); F max The relative humidity threshold for turning on the dehumidifier; The above function is inversely deduced from the air dew point temperature. When the atmospheric pressure is fixed, the formula is as follows: ； C is the redundancy correction value.

3. A method for controlling dehumidification of an energy storage cabinet according to claim 2, characterized in that: The relative humidity limit when the dehumidifier is turned off is: F min =F max -ΔF F min is the relative humidity threshold for dehumidifier shutdown; ΔF is the relative humidity differential value; The relative humidity hysteresis value ΔF is selected according to the volume of the space to be dehumidified, the cavity sealing performance and the equipment operation cycle.

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