Dehumidification and condensation prevention control method of liquid cooling energy storage outdoor cabinet

Abstract

The dehumidification and condensation prevention control method for the liquid cooling energy storage outdoor cabinet is low in cost and capable of effectively avoiding condensation and comprises the steps that S10, according to the current liquid outlet temperature T1 of a liquid cooling unit and the current liquid inlet temperature T2 of the liquid cooling unit, the target dew point temperature T3 is calculated and determined, and according to the current environment temperature and environment humidity in the liquid cooling energy storage outdoor cabinet, the environment dew point temperature T4 is determined; s20, the dehumidifier is controlled to be started and stopped according to the judgment result whether the environment dew-point temperature T4 is larger than or equal to the target dew-point temperature T3 or not; s30, the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid cooling unit are obtained in the dehumidification process of the dehumidifier, a new target dew point temperature T3'is calculated and determined, and a new environment dew point temperature T4 'is determined according to the current environment temperature and environment humidity in the liquid cooling energy storage outdoor cabinet; and S41, according to the judgment result whether the difference delta T between the new environment dew point temperature T4'and the new target dew point temperature T3 'is smaller than a first preset temperature threshold value X with the value being negative or not, the dehumidifier is controlled to stop dehumidification or continue to keep dehumidification.

Description

Technical Field

[0001] This application relates to the field of outdoor cabinet energy storage technology, and in particular to a dehumidification and anti-condensation control method for liquid-cooled outdoor energy storage cabinets. Background Technology

[0002] Liquid-cooled energy storage outdoor cabinets are generally equipped with dehumidifiers to dehumidify the air inside, preventing condensation and avoiding problems such as insulation abnormalities or component corrosion. Condensation principle: Warm air contains more water molecules than cold air. When the ambient temperature suddenly drops below the dew point, the relative humidity of the air becomes 100%, and the water vapor content reaches saturation. Water molecules then precipitate from the air and adhere to solid surfaces as droplets.

[0003] Currently, dehumidifiers typically set the relative humidity inside the liquid-cooled energy storage outdoor cabinet as the target value to control the dehumidification function. However, the battery pack in a liquid-cooled outdoor cabinet uses a liquid cooling system for heat dissipation. This system utilizes liquid cooling plates, liquid cooling units, liquid cooling pipes, and circulating coolant to dissipate heat through liquid convection, resulting in a typically low temperature at the liquid cooling plates inside the battery pack. The ambient dew point constantly changes with ambient temperature and relative humidity. If the relative humidity range is not properly set, on the one hand, under a certain ambient temperature, the dew point will be higher than the temperature at the liquid cooling plate, causing condensation at the liquid cooling plate and failing to meet dehumidification requirements; on the other hand, over-dehumidification will occur, increasing power loss. Therefore, setting the relative humidity as a target value can only meet the dehumidification requirements under certain ambient temperature conditions, negatively impacting the long-term safe and high-quality operation of the liquid-cooled energy storage outdoor cabinet. Summary of the Invention

[0004] This application provides a dehumidification and anti-condensation control method for a liquid-cooled energy storage outdoor cabinet, including:

[0005] S10: Calculate and determine the target dew point temperature T3 based on the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid chiller unit, where T3 = (T1 + T2) / 2, and determine the ambient dew point temperature T4 based on the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage unit.

[0006] S20: Control the opening and closing of the dehumidifier of the outdoor cabinet for cold storage based on the judgment result of whether the ambient dew point temperature T4 is greater than or equal to the target dew point temperature T3.

[0007] S30: During the dehumidification process, the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid chiller are obtained, the new target dew point temperature T3' is calculated and determined, and the new ambient dew point temperature T4' is determined based on the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage.

[0008] S41: Based on the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is less than the first preset temperature threshold X, control the dehumidifier to turn off dehumidification or continue to maintain dehumidification. The first preset temperature threshold X is negative.

[0009] In some optional embodiments of this application, step S20 includes:

[0010] Step S21: If the judgment result is yes, then control the dehumidifier to turn on dehumidification;

[0011] Step S22: If the result is negative, return to step S10.

[0012] In some optional embodiments of this application, step S41 includes

[0013] Step S411: If the judgment result is yes, then control the dehumidifier to turn off dehumidification and return to execute step S10;

[0014] Step S412: If the result is negative, return to step S30.

[0015] In some optional embodiments of this application, the first preset temperature threshold X is less than or equal to -2°C.

[0016] In some optional embodiments of this application, step S42 is further included, which includes:

[0017] Based on the judgment results of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is greater than or equal to the second preset temperature threshold Y, and whether the highest temperature Tmax of the battery pack in the liquid-cooled energy storage outdoor cabinet is less than or equal to the preset upper limit temperature, the current outlet temperature T1 of the liquid-cooled unit is controlled to adjust the new target dew point temperature T3', and the second preset temperature threshold Y is positive.

[0018] In some optional embodiments of this application, step S42 includes:

[0019] Step S421: If the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is greater than or equal to the second preset temperature threshold Y and whether the judgment result of whether the highest temperature Tmax of the battery in the battery pack is less than or equal to the preset upper limit temperature are both yes, then the current liquid outlet temperature T1 of the liquid cooling unit is increased to change the new target dew point temperature T3' in step S30.

[0020] In some optional embodiments of this application, in the step of raising the current outlet liquid temperature T1 of the liquid chiller: the temperature is increased in units of 0°C to 1°C, excluding the endpoint 0°C.

[0021] In some optional embodiments of this application, the maximum temperature Tmax is less than or equal to 35°C; and / or, the second preset temperature threshold Y is greater than or equal to 10°C.

[0022] In some optional embodiments of this application, steps S41 and S42 are performed simultaneously.

[0023] In some optional embodiments of this application, the liquid chiller uses its own temperature sensors installed at the inlet and outlet of the coolant to collect the current outlet temperature T1 and the current inlet temperature T2 of the liquid chiller, and uses a dehumidifier to collect the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage.

[0024] In some optional embodiments of this application, the energy management system (EMS) of the liquid-cooled energy storage outdoor cabinet is used to calculate and determine the target dew point temperature T3 and the ambient dew point temperature T4. The energy management system (EMS) automatically calculates the difference between the ambient dew point temperature T4 and the target dew point temperature T3, and calculates the difference between the new ambient dew point temperature T4' and the new target dew point temperature T3'.

[0025] Beneficial effects:

[0026] This application provides a dehumidification and anti-condensation control method for an outdoor liquid-cooled energy storage cabinet. The method determines the target dew point temperature based on the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid-cooled unit. The target dew point temperature is compared with the ambient dew point temperature calculated from the ambient temperature and humidity. Based on the comparison result, the dehumidifier's operating status is adjusted. This avoids the common problem of dehumidifiers, which typically rely on relative humidity to control dehumidification, only meeting dehumidification requirements under certain ambient temperature conditions and easily leading to condensation. It also avoids the situation where dehumidifiers, when controlled by relative humidity, sacrifice dehumidification costs to meet most ambient temperature requirements, resulting in excessive dehumidification and increased dehumidifier power, thus preventing damage.

[0027] The coolant flows through multiple liquid-cooled plates, and the temperature of all plates is reflected by detecting the coolant temperature, avoiding temperature errors caused by placing temperature sensors on the liquid-cooled plates. The target dew point temperature serves as the dehumidifier's target setpoint. Through internal program comparison, the dehumidification function is automatically turned on and off as ambient temperature conditions change. The dehumidifier's automatic control forms a closed loop, adjusting the relative humidity range in real time to effectively meet dehumidification requirements under various ambient temperature conditions, achieving ideal dehumidification results. Setting the target dew point temperature minimizes condensation in the liquid-cooled energy storage outdoor cabinet, improving its operational quality, lifespan, and safety performance. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a table showing the ambient temperature, relative humidity, and dew point of an outdoor liquid-cooled energy storage cabinet.

[0030] Figure 2 This is a flowchart of a dehumidification and anti-condensation control method for a liquid-cooled energy storage outdoor cabinet according to an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of a liquid cooling unit system using general technology;

[0032] Figure 4 This is a flowchart of a dehumidification and anti-condensation control method for a liquid-cooled energy storage outdoor cabinet according to another embodiment of this application. Detailed Implementation

[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0036] Battery packs in liquid-cooled outdoor energy storage cabinets typically employ a highly integrated design, combining liquid cooling technology to achieve efficient thermal management and safe operation.

[0037] A battery module typically comprises multiple battery cells. The battery cell is the basic building block of a battery module, and they are combined in series and parallel to achieve energy output and storage. Several battery modules form a battery pack, which, based on the modules, is jointly controlled and managed by a BMS (Battery Management System) and a thermal management system, ultimately forming a unified whole. It not only aggregates the electrical energy from numerous battery cells but also ensures the stability and safety of the entire system; several battery packs constitute a battery system.

[0038] The liquid cooling system includes a liquid cooling unit (with optional heater), liquid cooling plates, cooling pipes (including temperature sensors and valves), and coolant.

[0039] The battery system and liquid cooling system are thermally coupled to achieve efficient thermal management of the battery system. A liquid cooling plate is installed in the battery pack. Coolant circulates within the liquid cooling plate to remove heat generated by the battery, thereby achieving precise temperature control and ensuring uniform battery cooling. The liquid cooling unit includes a condenser, compressor, and electric water pump. Coolant flows from the liquid cooling unit to the liquid cooling plate. After exchanging heat with the battery on the liquid cooling plate, the coolant warms up and flows back into the liquid cooling unit. Therefore, the outlet temperature of the liquid cooling unit is lower than the inlet temperature of the liquid cooling unit, and the temperature inside the battery pack is relatively low at the liquid cooling plate.

[0040] The Battery Management System (BMS) monitors battery voltage, battery pack temperature, and SOC (State of Charge) in real time, performing overcharge / over-discharge protection and cell balancing functions. The BMS communicates with the liquid cooling system to control the temperature of the battery pack and its individual cells. Specifically, the BMS controls and manages the liquid cooling operation of the liquid cooling unit.

[0041] Dew point changes constantly with variations in ambient temperature and relative humidity. When the relative humidity range is inappropriate, under certain ambient temperature conditions, the dew point may exceed the temperature of a component inside the liquid-cooled energy storage outdoor cabinet. This can cause condensation on the liquid cooling plate inside the battery pack (the temperature of the liquid cooling plate is approximately equal to the temperature of the coolant). Condensation can lead to insulation abnormalities or component corrosion within the battery pack and outdoor cabinet. Liquid-cooled energy storage outdoor cabinets are typically equipped with dehumidifiers to dehumidify the air inside and prevent condensation.

[0042] Typical dehumidifiers control dehumidification based on changes in relative humidity. For example, dehumidification is activated when the battery pack inlet coolant temperature is 20°C and the relative humidity is ≥60%, and deactivated when the relative humidity is ≤40%. Figure 1As shown, when the ambient temperature is 29℃, the dew point at 60% relative humidity reaches 20.5℃, which is higher than 20℃, indicating condensation. The dew point increases with increasing ambient temperature. When the ambient temperature is 40℃, the dew point at 60% relative humidity reaches 30.7℃. Even when the relative humidity drops to 40%, the dew point still reaches 23.8℃, indicating condensation and failing to meet dehumidification requirements. The dew point only meets the requirements when the relative humidity drops to 30%, reaching 19.2℃, which is less than 20℃. This necessitates activating the dehumidification function when the relative humidity is ≥30%. However, when the ambient temperature is 25℃, the dew point corresponding to 70% relative humidity is 19.1℃, which still meets the requirements, theoretically eliminating the need for dehumidification. However, based on the target relative humidity setting, the dehumidifier will still operate under these conditions until the relative humidity reaches 40%. The corresponding dew point temperature at this time is 10.5℃, which is far lower than the dew point condition of 20℃, which is considered excessive dehumidification and increases power loss.

[0043] Therefore, setting the relative humidity as a target value can only meet the dehumidification requirements under certain ambient temperature conditions. Alternatively, setting the target relative humidity value to a very low level, such as turning on the dehumidification function when the relative humidity is ≥30%, can also cover most ambient temperature conditions, but this will greatly extend the dehumidifier's operating time and increase unnecessary power consumption.

[0044] Therefore, this application is submitted.

[0045] like Figure 2 As shown, this application provides a dehumidification and anti-condensation control method for a liquid-cooled energy storage outdoor cabinet, comprising:

[0046] S10: Calculate and determine the target dew point temperature T3 based on the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid chiller unit, where T3 = (T1 + T2) / 2, and determine the ambient dew point temperature T4 based on the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage unit.

[0047] S20: Control the opening and closing of the dehumidifier of the outdoor cabinet for cold storage based on the judgment result of whether the ambient dew point temperature T4 is greater than or equal to the target dew point temperature T3.

[0048] S30: During the dehumidification process, the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid chiller are obtained, the new target dew point temperature T3' is calculated and determined, and the new ambient dew point temperature T4' is determined based on the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage.

[0049] S41: Based on the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is less than the first preset temperature threshold X, control the dehumidifier to turn off dehumidification or continue to maintain dehumidification. The first preset temperature threshold X is negative.

[0050] This application provides a dehumidification and anti-condensation control method for an outdoor liquid-cooled energy storage cabinet. The method determines the target dew point temperature based on the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid-cooled unit. The target dew point temperature is compared with the ambient dew point temperature calculated from the ambient temperature and humidity. Based on the comparison result, the dehumidifier's operating status is adjusted. This avoids the common problem of dehumidifiers, which typically rely on relative humidity to control dehumidification, only meeting dehumidification requirements under certain ambient temperature conditions and easily leading to condensation. It also avoids the situation where dehumidifiers, when controlled by relative humidity, sacrifice dehumidification costs to meet most ambient temperature requirements, resulting in excessive dehumidification and increased dehumidifier power, thus preventing damage.

[0051] The coolant flows through multiple liquid-cooled plates, and the temperature of all plates is reflected by detecting the coolant temperature, avoiding temperature errors caused by placing temperature sensors on the liquid-cooled plates. The target dew point temperature serves as the dehumidifier's target setpoint. An internal program compares dew points and automatically turns the dehumidification function on and off as ambient temperature conditions change. The dehumidifier's automatic control forms a closed loop, adjusting the relative humidity range in real time to effectively meet dehumidification requirements under various ambient temperature conditions. This achieves ideal dehumidification results while avoiding excessive wear and tear on the dehumidifier, saving energy costs. Setting the target dew point temperature further minimizes condensation in the liquid-cooled energy storage outdoor cabinet, improving its operational quality, lifespan, and safety performance.

[0052] Generally, such as Figure 3 As shown, temperature sensors are installed at both the liquid outlet and inlet of the liquid chiller to detect the coolant temperature (i.e., Figure 3 Since the liquid chiller has an outlet water temperature sensor and an inlet water temperature sensor, there is no need to add additional temperature sensors to collect the current outlet liquid temperature T1 and the current inlet liquid temperature T2 of the liquid chiller, thus saving equipment costs.

[0053] like Figure 4 As shown, in some optional embodiments of this application, step S20 includes:

[0054] Step S21: If the judgment result is yes, then control the dehumidifier to turn on dehumidification;

[0055] Step S22: If the result is negative, return to step S10.

[0056] In some alternative embodiments,

[0057] Step S41 includes:

[0058] Step S411: If the judgment result is yes, then control the dehumidifier to turn off dehumidification and return to execute step S10;

[0059] Step S412: If the result is negative, return to step S30.

[0060] In some optional embodiments of this application, the first preset temperature threshold X is less than or equal to -2°C.

[0061] In some optional embodiments of this application, step S42 is further included, which includes:

[0062] Based on the judgment results of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is greater than or equal to the second preset temperature threshold Y, and whether the highest temperature Tmax of the battery pack in the liquid-cooled energy storage outdoor cabinet is less than or equal to the preset upper limit temperature, the current outlet temperature T1 of the liquid-cooled unit is controlled to adjust the new target dew point temperature T3', and the second preset temperature threshold Y is positive.

[0063] In these embodiments, condensation is prevented in the liquid-cooled energy storage outdoor cabinet while the battery pack operates at a specified temperature. Furthermore, by adjusting the new target dew point temperature T3', the battery pack life and operational safety are prevented from being in a high-temperature and high-humidity environment inside the liquid-cooled energy storage outdoor cabinet for a long time, and the battery is removed from the high-temperature and high-humidity environment in a timely and rapid manner.

[0064] In some optional embodiments of this application, step S42 includes:

[0065] Step S421: If the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is greater than or equal to the second preset temperature threshold Y and whether the judgment result of whether the highest temperature Tmax of the battery in the battery pack is less than or equal to the preset upper limit temperature are both yes, then the current liquid outlet temperature T1 of the liquid cooling unit is increased to change the new target dew point temperature T3' in step S30.

[0066] In some optional embodiments of this application, the step of raising the current outlet liquid temperature T1 of the liquid chiller unit is: the temperature is increased in units of 0°C to 1°C, excluding the endpoint 0°C.

[0067] In some optional embodiments of this application, the current outlet temperature of the liquid cooler unit is increased by 1°C each time. Since the current outlet temperature of the liquid cooler unit is the lowest temperature during the overall operation of the liquid cooler unit, and the current inlet temperature of the liquid cooler unit is the temperature after the coolant exchanges heat with the battery, the temperature controllability is relatively low. Therefore, the current outlet temperature of the liquid cooler unit is a temperature parameter with relatively high controllability.

[0068] In some optional embodiments of this application, the maximum temperature Tmax is less than or equal to 35°C; and / or, the second preset temperature threshold Y is greater than or equal to 10°C.

[0069] In these embodiments, setting the maximum temperature Tmax reduces the risk of battery thermal runaway and ensures battery efficiency. The second preset temperature threshold setting ensures that the liquid-cooled energy storage outdoor cabinet only adjusts the current outlet temperature of the liquid cooler when the environment inside is under extreme high temperature and humidity conditions. This ensures that the coolant outlet temperature is generally lower, guaranteeing good cooling of the battery cells. Under high temperature and humidity conditions, it achieves dehumidification faster with the same dehumidification efficiency of the dehumidifier, preventing condensation.

[0070] In some optional embodiments of this application, steps S41 and S42 are performed simultaneously.

[0071] In some optional embodiments of this application, temperature sensors located at the inlet and outlet of the liquid coolant unit are used to collect the current outlet temperature T1 and inlet temperature T2 of the liquid coolant unit, and a dehumidifier is used to collect the ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage. Dehumidifiers generally have built-in temperature and humidity sensors to collect ambient temperature and humidity data.

[0072] The dehumidifier's built-in temperature and humidity sensors collect the current ambient temperature and humidity inside the liquid-cooled energy storage outdoor cabinet and send them to the cabinet's Energy Management System (EMS). The liquid-cooled chiller's own temperature sensors, located at the coolant inlet and outlet, collect the current outlet temperature T1 and inlet temperature T2 and also send them to the EMS. The relevant temperature and humidity data used to determine the target dew point temperature T3 and ambient dew point temperature T4 are collected using existing temperature and humidity sensors within the liquid-cooled energy storage outdoor cabinet, eliminating the need for additional sensors, reducing detection costs, and simplifying the detection process.

[0073] In some optional embodiments of this application, the energy management system (EMS) of the liquid-cooled energy storage outdoor cabinet is used to calculate and determine the target dew point temperature T3 and the ambient dew point temperature T4. The energy management system (EMS) automatically calculates the difference between the ambient dew point temperature T4 and the target dew point temperature T3, and calculates the difference between the new ambient dew point temperature T4' and the new target dew point temperature T3'.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for dehumidification and anti-condensation control of an outdoor liquid-cooled energy storage cabinet, characterized in that, include: S10: Calculate and determine the target dew point temperature T3 based on the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid chiller unit, where T3 = (T1 + T2) / 2, and determine the ambient dew point temperature T4 based on the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage unit. S20: Control the opening and closing of the dehumidifier of the cold storage outdoor cabinet based on the judgment result of whether the ambient dew point temperature T4 is greater than or equal to the target dew point temperature T3. S30: During the dehumidification process, the dehumidifier obtains the current liquid outlet temperature T1 and the current liquid inlet temperature T2 of the liquid chiller, calculates and determines the new target dew point temperature T3', and determines the new ambient dew point temperature T4' based on the current ambient temperature and humidity inside the liquid-cooled energy storage outdoor cabinet. S41: Based on the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is less than the first preset temperature threshold X, control the dehumidifier to turn off dehumidification or continue to maintain dehumidification, wherein the first preset temperature threshold X is negative.

2. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 1, characterized in that, Step S20 includes: Step S21: If the judgment result is yes, then control the dehumidifier to turn on dehumidification; Step S22: If the result is negative, return to step S10.

3. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 1, characterized in that, Step S41 includes Step S411: If the judgment result is yes, then control the dehumidifier to turn off dehumidification and return to execute step S10; Step S412: If the result is negative, then return to step S30.

4. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 1, characterized in that, The first preset temperature threshold X is less than or equal to -2℃.

5. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to any one of claims 1 to 4, characterized in that, It also includes step S42, which includes: Based on the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is greater than or equal to the second preset temperature threshold Y, and the judgment result of whether the highest temperature Tmax of the battery pack in the liquid-cooled energy storage outdoor cabinet is less than or equal to the preset upper limit temperature, the current outlet temperature T1 of the liquid-cooled unit is controlled to adjust the new target dew point temperature T3', and the second preset temperature threshold Y is positive.

6. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 5, characterized in that, Step S42 includes: Step S421: If the judgment result of whether the difference ΔT between the new ambient dew point temperature T4' and the new target dew point temperature T3' is greater than or equal to the second preset temperature threshold Y and whether the judgment result of whether the highest temperature Tmax of the battery in the battery pack is less than or equal to the preset upper limit temperature are both yes, then the current liquid outlet temperature T1 of the liquid cooling unit is increased to change the new target dew point temperature T3' in step S30; Preferably, in the step of raising the current outlet temperature T1 of the liquid cooler unit: the temperature is increased in units of 0℃ to 1℃, excluding the endpoint 0℃.

7. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 5, characterized in that, The maximum temperature Tmax is less than or equal to 35°C; and / or the second preset temperature threshold Y is greater than or equal to 10°C.

8. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 5, characterized in that, Steps S41 and S42 are performed simultaneously.

9. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 1, characterized in that, The liquid cooler unit uses its own temperature sensors installed at the inlet and outlet of the coolant to collect the current outlet temperature T1 and the current inlet temperature T2 of the liquid cooler unit, and the dehumidifier uses the current ambient temperature and humidity inside the outdoor cabinet of the liquid-cooled energy storage unit.

10. The dehumidification and anti-condensation control method for liquid-cooled energy storage outdoor cabinets according to claim 1 or 9, characterized in that, The Energy Management System (EMS) of the liquid-cooled outdoor energy storage cabinet calculates and determines the target dew point temperature T3 and the ambient dew point temperature T4. The EMS automatically calculates the difference between the ambient dew point temperature T4 and the target dew point temperature T3, and also calculates the difference between the new ambient dew point temperature T4' and the new target dew point temperature T3'.

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