Low-energy-consumption anti-condensation energy storage battery thermal management system and control method

Abstract

The application discloses a low-energy-consumption anti-condensation energy storage battery thermal management system and a control method, which comprises a variable-condition battery liquid cooling module and an anti-condensation treatment module. The variable-condition battery liquid cooling module comprises an energy storage battery box, a plurality of energy storage batteries, a water chiller unit and a pump group, a battery liquid cooling plate, a circulating cold water temperature sensor and a variable-condition water temperature control module for regulating the temperature of the battery liquid cooling plate. The anti-condensation treatment module comprises a variable-power cooling fan arranged on each energy storage battery and used for avoiding condensation on the surface of the battery liquid cooling plate, a battery box air temperature sensor used for monitoring the air temperature, a battery box air humidity sensor used for monitoring the air humidity, a battery box environment monitoring calculation module used for calculating the dew point temperature of the wet air in the battery box and a strengthened evaporation control module used for regulating the power of the variable-power cooling fan. The application solves the problems of condensation on the surface of the battery liquid cooling plate and excessive energy consumption of the existing anti-condensation system in the prior art.

Description

Technical Field

[0001] This invention relates to the field of battery heat dissipation management, and in particular to a low-energy-consumption, anti-condensation thermal management system and control method for energy storage batteries. Background Technology

[0002] The enclosure of an energy storage device typically houses several or even hundreds of battery packs. This dense arrangement of battery packs, coupled with the continuous increase in charge and discharge rates, leads to a significant increase in heat flux density, which in turn increases the difficulty of heat dissipation. To address this challenge, liquid cooling systems, due to their superior heat exchange efficiency and excellent heat handling capabilities, are often introduced into such densely arranged energy storage devices to effectively manage the generated heat.

[0003] Because the battery pack itself releases a considerable amount of heat, the coolant supplied by the liquid cooling system is typically at a relatively low temperature. However, in environments with high ambient temperatures and high humidity levels inside the battery pack, a serious problem can arise: condensation on the liquid cooling plates. This phenomenon can pose a serious threat to the safety of the energy storage device. Condensation can not only damage the external packaging and electrical components of the battery pack, but it can also seep into the internal components of the energy storage battery, causing short circuits or other serious problems, thus leading to potential safety risks.

[0004] To address this issue, comprehensive measures are necessary to effectively manage the operation of the liquid cooling system. Existing technologies have proposed several targeted solutions, such as the method, cooling system, and energy storage system for preventing condensation in a battery compartment disclosed in Chinese Patent CN202310671271.9. This method obtains the corresponding condensation temperature by measuring the temperature and humidity inside the battery compartment. When the condensation temperature exceeds a preset first temperature, the liquid cooling components are controlled to start operating at a preset second temperature as the liquid supply temperature, and the air-cooling components are also controlled to start operating, wherein the second temperature is lower than the first temperature. By combining liquid cooling and air cooling, the humidity inside the battery compartment can be reduced in a timely manner, decreasing the probability of condensation and ensuring system safety. However, it should be noted that although theoretically, adding an air temperature and humidity control pipeline inside the compartment can reduce the air temperature and humidity, thereby solving the condensation problem on the liquid cooling plates, this design has several key issues. First, the design fails to consider that the liquid cooling system should have different circulating chilled water temperatures at different charge / discharge rates to meet energy-saving requirements. In other words, the air parameters within the compartment should not only depend on the dew point temperature of the surrounding environment but should also vary with the battery's characteristics. Second, the system's attempt to control the ambient air state point throughout the battery compartment to address condensation on the battery's liquid cooling plate is unnecessary. This method consumes significantly too much energy when dealing with sensible and latent heat loads within the battery compartment. Third, even with a condensate tray installed inside the compartment, potential electrical system safety hazards cannot be avoided.

[0005] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0006] Purpose of the invention: The first purpose of this invention is to provide a low-energy-consumption anti-condensation thermal management system for energy storage batteries, which solves the problems of condensation on the surface of battery liquid cooling plates and excessive energy consumption in existing anti-condensation systems.

[0007] The second objective of this invention is to provide a control method for a low-energy-consumption, anti-condensation thermal management system for energy storage batteries.

[0008] Technical Solution: To achieve the above objectives, this invention discloses a low-energy-consumption, anti-condensation thermal management system for energy storage batteries, comprising a variable-condition battery liquid cooling module and an anti-condensation treatment module. The variable-condition battery liquid cooling module includes an energy storage battery box, several energy storage batteries located within the energy storage battery box, a chiller and pump unit connected to the energy storage batteries, a battery liquid cooling plate connected to each energy storage battery, a circulating chilled water temperature sensor for measuring the circulating chilled water temperature of the battery liquid cooling plate, and a variable-condition water temperature control module for regulating the temperature of the battery liquid cooling plate. The anti-condensation treatment module includes a variable-power cooling fan located on each energy storage battery to prevent condensation on the surface of the battery liquid cooling plate, a battery box air temperature sensor for monitoring air temperature, a battery box air humidity sensor for monitoring air humidity, a battery box environment monitoring and calculation module for calculating the dew point temperature of the humid air inside the battery box, and an enhanced evaporation control module for regulating the power of the variable-power cooling fan.

[0009] The chiller and pump unit are connected to the energy storage battery through a chilled water circulation pipe.

[0010] Preferably, the circulating cold water temperature sensor is arranged on the cold water circulation pipe.

[0011] Furthermore, the airflow outlet of the variable power cooling fan is sealed to the air guide bend, and the outlet of the air guide bend faces the bottom of the battery liquid cooling plate.

[0012] Furthermore, the battery box air temperature sensor and the battery box air humidity sensor are arranged inside the energy storage battery box. The battery box air temperature sensor and the battery box air humidity sensor are in direct contact with the air to measure the air temperature and relative humidity inside the energy storage battery box.

[0013] Preferably, it also includes a control cabinet, in which the variable operating condition water temperature control module, the battery box environmental monitoring and calculation module, and the enhanced evaporation control module are all installed.

[0014] Furthermore, the variable operating condition water temperature control module has a built-in database of liquid cooling performance corresponding to different battery charge and discharge rates, and receives measurement data from the circulating chilled water temperature sensor in real time. Based on the measurement data from the circulating chilled water temperature sensor, it adjusts the operating power of the chiller and pump to regulate the temperature of the battery liquid cooling plate.

[0015] Furthermore, the battery box environmental monitoring and calculation module receives measurement data from the battery box air temperature sensor and the battery box air humidity sensor in real time, and calculates the dew point temperature of the humid air inside the battery box based on the measurement data from the battery box air temperature sensor and the battery box air humidity sensor.

[0016] Preferably, the enhanced evaporation control module receives in real time the target temperature of the battery liquid cooling plate controlled by the variable-condition water temperature control module and the dew point temperature of the moist air in the battery box calculated by the battery box environment monitoring and calculation module, judges the possibility and rate of condensation, and adjusts the power of the variable-power cooling fan to change the evaporation intensity of condensed water on the battery liquid cooling plate.

[0017] The present invention discloses a control method for an energy storage battery thermal management system with low energy consumption and anti-condensation, which comprises the following steps when the start / stop of charging and discharging of the energy storage battery or the change of the charging / discharging rate occurs:

[0018] (1) The variable-condition water temperature control module queries the liquid cooling performance database corresponding to the current battery charging / discharging rate, and obtains the required maximum circulating cold water temperature T of the battery liquid cooling plate under the set charging / discharging rate water ;

[0019] (2) The variable-condition water temperature control module collects the current circulating cold water temperature T through the circulating cold water temperature sensor;

[0020] (3) The battery box environment monitoring and calculation module collects the current air temperature T in the battery box through the battery box air temperature sensor and the battery box air humidity sensor air and the relative air humidity RH, and calculates the current dew point temperature T in the battery box d ;

[0021] (4) The variable-condition water temperature control module compares the required circulating cold water temperature T water with the current circulating cold water temperature T, if T water <T-0.1°C, increase the operating power of the water chiller and the pump set, so that the circulating cold water temperature T in the battery liquid cooling plate decreases; if T water >T+0.1°C, decrease the operating power of the water chiller and the pump set, so that the circulating cold water temperature T in the battery liquid cooling plate rises; if T-0.1°C≤T water ≤T+0.1°C, the water chiller and the pump set keep the current operating power unchanged, and the circulating cold water temperature T in the battery liquid cooling plate remains unchanged;

[0022] (5) The enhanced evaporation control module compares the current circulating cold water temperature T with the current dew point temperature T in the battery box d , if T≥T d , keep the normal operating power of the variable-power cooling fan under this working condition; if T d -10°C≤T<T d , make the variable-power cooling fan change the operating power, adjust the outlet wind speed of the air guide elbow, so that the outlet air flow velocity of the air guide elbow reaches a first set speed; if T<T dAt -10℃, the variable power cooling fan changes its operating power, and the airflow speed at the outlet of the air guide bend is adjusted so that the airflow speed at the outlet of the air guide bend reaches the second set speed.

[0023] Repeat steps (2) to (5) while the battery maintains its current charge / discharge rate.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0025] (1) The present invention adjusts the maximum liquid cooling circulating water temperature according to different charge and discharge rates and guides the battery’s own cooling fan to blow on the surface of the battery liquid cooling plate to enhance surface water evaporation, thereby achieving targeted condensation suppression while greatly reducing the operating energy consumption of the entire system.

[0026] (2) The present invention can automatically adjust the circulating cold water temperature in the battery liquid cooling plate according to the liquid cooling performance database corresponding to different battery charge and discharge rates, and match the necessary power anti-condensation work, thereby reducing the generation of condensation on the battery liquid cooling plate surface while ensuring that battery thermal runaway is avoided, thus saving resources.

[0027] (3) The anti-condensation treatment module of the present invention cleverly utilizes the cooling fan of the energy storage battery itself, and adds a guide pipe after it so that the hot airflow blows on the surface of the battery liquid cooling plate. This enhances the evaporation of surface moisture by increasing the air velocity and temperature near the surface of the battery liquid cooling plate, thereby significantly reducing the possibility of water vapor condensing on the surface of the battery liquid cooling plate. The changes on the original structure are minimal, making full use of existing resources, reducing maintenance difficulty and modification costs, and avoiding the need to control the overall air temperature and humidity inside the battery box to prevent condensation, thus significantly reducing the energy consumption of the anti-condensation work.

[0028] (4) This invention utilizes an enhanced evaporation control module to regulate the power of a variable power cooling fan so that the condensation rate on the surface of the battery liquid cooling plate is lower than the evaporation rate. This mechanism avoids the generation of condensate, thus preventing the possibility of condensate dripping and causing water to enter the external packaging and electrical components of the battery pack, or even seep into the energy storage battery, leading to serious problems such as short circuits. At the same time, it eliminates the need to install a condensate tray in the battery box, further reducing the safety hazards of the energy storage battery and its electrical system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the installation of the energy storage battery and the battery liquid cooling plate in this invention;

[0031] Figure 3This is a distribution diagram of the conversion rate of liquid water to gas water on the surface of the battery liquid cooling plate in Embodiment 2 of the present invention;

[0032] Figure 4 This is a distribution diagram of the conversion rate of liquid water to gas water on the surface of the battery liquid cooling plate before the system is stably running in Embodiment 3 of the present invention.

[0033] Figure 5 This is a distribution diagram of the conversion rate of liquid water to gas water on the surface of the battery liquid cooling plate after the system has been running stably in Embodiment 3 of the present invention. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0035] like Figure 1 and Figure 2 As shown, this invention discloses a low-energy-consumption, anti-condensation thermal management system for energy storage batteries, including a variable-condition battery liquid cooling module, an anti-condensation treatment module, and a control cabinet. The variable-condition battery liquid cooling module includes an energy storage battery box, energy storage batteries 1, a chiller and pump set 2, a battery liquid cooling plate 4, a circulating cold water temperature sensor 5, a cold water circulation pipe 3, and a variable-condition water temperature control module 6. Several energy storage batteries 1 are located inside the energy storage battery box, and the chiller and pump set 2 are connected to the energy storage batteries 1 through the cold water circulation pipe 3. A battery liquid cooling plate 4 is installed below each energy storage battery, and the circulating cold water temperature sensor 5 is arranged on the cold water circulation pipe 3 to measure the circulating cold water temperature of the battery liquid cooling plate. The variable operating condition water temperature control module 6 is used to regulate the temperature of the battery liquid cooling plate. It incorporates a database of liquid cooling performance corresponding to different battery charge / discharge rates, generated through CFD numerical simulation and experimentation. It also receives real-time measurement data from the circulating chilled water temperature sensor and adjusts the operating power of the chiller and pump unit based on this data to regulate the battery liquid cooling plate temperature. The circulating chilled water temperature sensor, chiller unit, and pump unit are electrically connected to the variable operating condition water temperature control module.

[0036] The anti-condensation treatment module includes a variable power cooling fan 7, an air guide bend 8, a battery box air temperature sensor 9, a battery box air humidity sensor 10, a battery box environmental monitoring and calculation module 11, and an enhanced evaporation control module 12. The variable operating condition water temperature control module 6, the battery box environmental monitoring and calculation module 11, and the enhanced evaporation control module 12 are all located in the control cabinet 13. The variable operating condition water temperature control module, the battery box environmental monitoring and calculation module, and the enhanced evaporation control module in the control cabinet are connected to the electrical components in the system for end control.

[0037] The variable-power cooling fan 7 is disposed on each energy storage battery, the air outlet of the variable-power cooling fan 7 is sealingly connected to the air guide bent pipe 8, the outlet of the air guide bent pipe faces the bottom end of the battery liquid cooling plate 4, and the variable-power cooling fan 7 is used to prevent condensation on the surface of the battery liquid cooling plate. The battery box air temperature sensor 9 and the battery box air humidity sensor 10 are arranged inside the energy storage battery box, the battery box air temperature sensor 9 and the battery box air humidity sensor 10 are in direct contact with air to measure the air temperature and relative air humidity inside the energy storage battery box. The battery box environment monitoring and calculation module 11 is configured to calculate the dew point temperature of the humid air inside the battery box, the battery box environment monitoring and calculation module 11 receives the measurement data fed back by the battery box air temperature sensor and the battery box air humidity sensor in real time, and calculates the dew point temperature of the humid air inside the battery box according to the measurement data fed back by the battery box air temperature sensor and the battery box air humidity sensor, specifically, the current air temperature T inside the battery box air and the relative air humidity RH, the current dew point temperature T inside the battery box is automatically calculated according to the Magnus-Tetens approximation method d , the calculation formula is as follows:

[0038]

[0039] Meanwhile:

[0040]

[0041] Wherein, a and b are both empirical formula calculation constants of the Magnus-Tetens Approximation, and have no physical meaning, a is a dimensionless number, and b has a temperature dimension with the unit of K or °C; when the temperature T air satisfies 0°C < T air < 60°C, the relative humidity RH satisfies 0% < RH < 100%, and the dew point temperature T d satisfies 0°C < T d < 50°C, a=17.27 and b=237.7°C can be taken.

[0042] The battery box air temperature sensor and the battery box air humidity sensor are electrically connected to the battery box environment monitoring and calculation module. The variable-condition water temperature control module, the battery box environment monitoring and calculation module and the variable-power cooling fan are electrically connected to the enhanced evaporation control module.

[0043] The enhanced evaporation control module 12 is configured to regulate the power of the variable-power cooling fan. The enhanced evaporation control module 12 receives in real time the target temperature of the battery liquid cooling plate controlled by the variable-condition water temperature control module and the dew point temperature of the moist air inside the battery box calculated by the battery box environment monitoring and calculation module, judges the possibility and rate of condensation, and adjusts the power of the variable-power cooling fan to change the evaporation intensity of condensed water on the battery liquid cooling plate. The present invention combines the requirement that different liquid cooling circulating cold water temperatures should be set for energy storage batteries under different charge-discharge rates, comprehensively considers the possibility of condensation caused by the surface temperature of the battery liquid cooling plate being lower than the dew point temperature of the air inside the battery box, and skillfully utilizes the self-generated heat dissipation exhaust air of the battery box to realize variable-power enhanced evaporation under different discharge working conditions, which effectively prevents condensation on the battery liquid cooling plate without adjusting the temperature and humidity of the air inside the battery box, thereby realizing dynamic automatic control of the thermal management of the energy storage battery with significantly low energy consumption and avoiding the safety hazard of condensed water dripping from the battery liquid cooling plate.

[0044] The present invention provides a control method for an energy storage battery thermal management system with low energy consumption and condensation prevention, which includes the following steps when the charging and discharging of the energy storage battery starts or stops or the charge-discharge rate changes:

[0045] (1) The variable-condition water temperature control module queries the liquid cooling performance database corresponding to the current battery charge-discharge rate, and obtains the maximum circulating cold water temperature T of the battery liquid cooling plate required under the set charge-discharge rate water ;

[0046] (2) The variable-condition water temperature control module collects the current circulating cold water temperature T through the circulating cold water temperature sensor;

[0047] (3) The battery box environment monitoring and calculation module collects the current air temperature T inside the battery box through the battery box air temperature sensor and the battery box air humidity sensor air and the relative air humidity RH, and calculates the current dew point temperature T inside the battery box d ;

[0048] (4) The variable-condition water temperature control module compares the required circulating cold water temperature T water with the current circulating cold water temperature T, if T water <T-0.1°C, the operating power of the chiller unit and the pump set is increased, and the circulating cold water temperature T in the temperature of the battery liquid cooling plate decreases; if T water >T+0.1°C, the operating power of the chiller unit and the pump set is reduced, and the circulating cold water temperature T in the temperature of the battery liquid cooling plate rises; if T-0.1°C≤T water ≤T+0.1°C, the chiller unit and the pump set keep the current operating power unchanged, and the circulating cold water temperature T in the temperature of the battery liquid cooling plate remains unchanged;

[0049] (5) The enhanced evaporation control module compares the current circulating cold water temperature T with the current dew point temperature T inside the battery box. d For comparison, if T≥T d If T d -10℃≤T <T d This causes the variable power cooling fan to change its operating power, adjusting the airflow speed at the outlet of the air guide bend to achieve the first set speed; if T <T d At -10℃, the variable power cooling fan changes its operating power, and the airflow speed at the outlet of the air guide bend is adjusted so that the airflow speed at the outlet of the air guide bend reaches the second set speed.

[0050] Repeat steps (2) to (5) while the battery maintains its current charge / discharge rate.

[0051] Example 1

[0052] In a certain location, an energy storage battery box is designed to provide circulating water at different temperatures for battery liquid cooling plates under varying charge and discharge power to reduce thermal management energy consumption. Simultaneously, it aims to prevent condensation from dripping onto the battery surface and posing a safety hazard. To achieve these goals with significantly lower energy consumption, this embodiment 1 provides a low-energy-consumption, anti-condensation energy storage battery thermal management system. This system includes a variable-condition battery liquid cooling module and an anti-condensation treatment module. The variable-condition battery liquid cooling module includes an energy storage battery 1, a chiller and pump unit 2, a chilled water circulation pipe 3, a battery liquid cooling plate 4, a circulating chilled water temperature sensor 5, and a variable-condition water temperature control module 6. The anti-condensation treatment module includes a variable-power cooling fan 7, an air guide bend 8, a battery box air temperature sensor 9, a battery box air humidity sensor 10, a battery box environmental monitoring and calculation module 11, and an enhanced evaporation control module 12.

[0053] The chiller unit and pump set 2 and the battery liquid cooling plate 4 are connected via the chilled water circulation pipe 3. The circulating chilled water temperature sensor 5 and the chiller unit and pump set 2 are electrically connected to the variable operating condition water temperature control module 6. The battery box air temperature sensor 9 and the battery box air humidity sensor 10 are electrically connected to the battery box environmental monitoring and calculation module 11. The variable operating condition water temperature control module 6, the battery box environmental monitoring and calculation module 11, and the variable power cooling fan 7 are electrically connected to the enhanced evaporation control module 12.

[0054] Considering the air temperature T inside the energy storage battery box 14 on a certain day air The temperature is 20℃ and the relative humidity is 40%.

[0055] At this time, the energy storage battery 1 starts charging and discharging, and the variable-condition water temperature control module 6 automatically queries the liquid cooling performance database corresponding to the current battery charging-discharging rate, to obtain the maximum circulating cold water temperature T of the battery liquid cooling plate required under the set charging-discharging rate water is 10°C.

[0056] The variable-condition water temperature control module 6 collects that the current circulating cold water temperature T is 20°C through the circulating cold water temperature sensor 5, and at the same time, the battery box environment monitoring and calculation module 11 collects the current air temperature T inside the battery box through the battery box air temperature sensor 9 and the battery box air humidity sensor 10 air of 20°C and a relative air humidity RH of 40%, and automatically calculates the current dew point temperature T inside the battery box according to the Magnus-Tetens approximation method d , the calculation formula is as follows:

[0057]

[0058] Meanwhile:

[0059]

[0060] where a=17.27, b=237.7°C.

[0061] Therefore, the battery box environment monitoring and calculation module 11 calculates that the dew point temperature T d is 9.25°C.

[0062] The variable-condition water temperature control module 6 compares the required circulating cold water temperature T water with the current circulating cold water temperature T, and finds that T water < T - 0.1°C, so the operating power of the chiller and pump unit 2 is increased, and the temperature T of the circulating cold water in the cold water circulation pipe 3 and the battery liquid cooling plate 4 decreases.

[0063] The enhanced evaporation control module 12 compares the current circulating cold water temperature T with the current dew point temperature T inside the battery box d , and finds that T ≥ T d , so no intervention is performed on the variable-power cooling fan 7, to keep it at the normal operating power under this working condition.

[0064] Subsequently, the above logical judgment steps are continuously repeated before changing the battery charging-discharging power or stopping charging and discharging, and the temperature T of the circulating cold water in the cold water circulation pipe 3 and the battery liquid cooling plate 4 finally drops to be close to T water , that is, around 10°C. At this time, the circulating cold water temperature T in the whole process all satisfies T ≥ T d , so the variable-power cooling fan 7 is never intervened.

[0065] Embodiment 2

[0066] Example 2 differs from Example 1 in that it assumes that the battery charging and discharging power is maintained on the basis of stable operation in Example 1. However, the ambient temperature and humidity of the energy storage battery box 14 change, and the temperature T inside the energy storage battery box 14 changes. air The temperature is 25℃ and the relative humidity is 60%.

[0067] In this scenario, the variable operating condition water temperature control module 6 collects the current circulating chilled water temperature T as 10℃ through the circulating chilled water temperature sensor 5, while the battery box environment monitoring and calculation module 11 collects the current air temperature T inside the battery box through the battery box air temperature sensor 9 and the battery box air humidity sensor 10. air The temperature is 25°C and the relative humidity (RH) is 60%. The current dew point temperature T inside the battery compartment is automatically calculated based on the Magnus-Tetens approximation method. d The dew point temperature T was calculated. d The temperature was 16.68℃.

[0068] The enhanced evaporation control module 12 compares the current circulating chilled water temperature T with the current dew point temperature T inside the battery compartment. d By comparison, T was found d -10℃≤T <T d Therefore, the operating power of the variable power cooling fan 7 was changed to achieve an air velocity of 10 m / s at the outlet of the air guide bend 8, thereby enhancing the blowing effect on the surface of the battery liquid cooling plate 4. CFD numerical simulation calculations were performed on Example 2 to verify this, revealing that the conversion rate from liquid water to gaseous water on the surface of the battery liquid cooling plate ranged from 0.28 kg / (m³). 2 ·s) to 1.68kg / (m 2 ·s), such as Figure 3 As shown, at this time, the rate of condensation of water vapor on its surface is lower than the evaporation rate, thus avoiding the generation of condensation.

[0069] The remaining working steps are the same as in Example 1.

[0070] Example 3

[0071] The difference between Example 3 and Example 1 is that, assuming that the battery charging and discharging power is changed based on the stable operation of Example 1, the variable operating condition water temperature control module 6 automatically queries the liquid cooling performance database corresponding to the current battery charging and discharging rate to obtain the maximum circulating cooling water temperature T of the battery liquid cooling plate required at the set charging and discharging rate. water The temperature is 15℃. Meanwhile, the ambient temperature and humidity of the location of the energy storage battery box 14 change, at which point the temperature T inside the energy storage battery box 14... air The temperature is 30℃ and the relative humidity is 70%.

[0072] In this scenario, the initial variable operating condition water temperature control module 6 initially acquires the current circulating chilled water temperature T as 10℃ through the circulating chilled water temperature sensor 5. Simultaneously, the battery box environment monitoring and calculation module 11 acquires the current air temperature T inside the battery box through the battery box air temperature sensor 9 and the battery box air humidity sensor 10. air The temperature is 30°C and the relative humidity (RH) is 70%. The current dew point temperature T inside the battery compartment is automatically calculated based on the Magnus-Tetens approximation method. d The dew point temperature T was calculated. d It is 23.91℃.

[0073] The variable operating condition water temperature control module 6 will set the required circulating cooling water temperature T water Comparing it with the current circulating cold water temperature T, it was found that T water The temperature is >T+0.1℃, thus reducing the operating power of the chiller unit and pump unit 2.

[0074] The enhanced evaporation control module 12 compares the current circulating chilled water temperature T with the current dew point temperature T inside the battery compartment. d By comparison, T was found <T d The temperature was -10℃, therefore the power of the variable-power cooling fan 7 was increased to maximize the airflow velocity at the outlet of the air guide bend 8 to 20m / s, thereby enhancing the blowing effect on the surface of the battery liquid cooling plate 4. CFD numerical simulation calculations were performed on Example 3 to verify this, revealing that the conversion rate from liquid water to vapor water on the surface of the battery liquid cooling plate ranged from 0.48 kg / (m³). 2 ·s) to 1.71kg / (m 2 ·s), such as Figure 4 As shown, at this time, the rate of condensation of water vapor on its surface is lower than the evaporation rate, thus avoiding the generation of condensation.

[0075] Subsequently, the above logical judgment steps are repeated continuously before changing the battery charging and discharging power or stopping charging and discharging. The circulating cold water temperature T in the cold water circulation pipe 3 and the battery liquid cooling plate 4 eventually rises to close to T. water That is, around 15℃. During the above process, as the circulating cold water temperature T continuously rises, the enhanced evaporation control module 12 detects T starting from a certain logical judgment. d -10℃≤T <T d Therefore, the power of the variable-power cooling fan 7 was adjusted to achieve an airflow velocity of 10 m / s at the outlet of the air guide bend 8, and maintained until it stabilized. CFD numerical simulation calculations verified that the conversion rate of liquid water to gaseous water on the surface of the battery liquid cooling plate ranged from 0.33 kg / (m³). 2 ·s) to 1.68kg / (m 2 ·s), such as Figure 5 As shown, at this time, the rate of condensation of water vapor on its surface is lower than the evaporation rate, thus avoiding the generation of condensation.

[0076] The remaining working steps are the same as in Example 1.

[0077] The preferred embodiments of the present invention have been described in detail above, but the design concept of the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solution of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A low-energy-consumption, anti-condensation thermal management system for energy storage batteries, characterized in that, The battery includes a variable operating condition liquid cooling module and an anti-condensation treatment module. The variable operating condition liquid cooling module includes an energy storage battery box (14), several energy storage batteries (1) located in the energy storage battery box, a chiller and pump group (2) connected to the energy storage batteries, a battery liquid cooling plate (4) connected to each energy storage battery, a circulating chilled water temperature sensor (5) for measuring the circulating chilled water temperature of the battery liquid cooling plate, and a variable operating condition water temperature control module (6) for regulating the temperature of the battery liquid cooling plate. The anti-condensation treatment module includes a variable power cooling fan (7) located on each energy storage battery and used to prevent condensation on the surface of the battery liquid cooling plate, a battery box air temperature sensor (9) for monitoring air temperature, a battery box air humidity sensor (10) for monitoring air humidity, a battery box environmental monitoring and calculation module (11) for calculating the dew point temperature of the humid air in the battery box, and an enhanced evaporation control module (12) for regulating the power of the variable power cooling fan. The variable operating condition water temperature control module (6) has a built-in liquid cooling performance database corresponding to different battery charge and discharge rates, and receives the measurement data fed back by the circulating cold water temperature sensor in real time. Based on the measurement data fed back by the circulating cold water temperature sensor, the operating power of the chiller and pump group is adjusted to adjust the battery liquid cooling plate temperature. The enhanced evaporation control module (12) receives in real time the target temperature of the battery liquid cooling plate controlled by the variable operating condition water temperature control module and the dew point temperature of the humid air in the battery box calculated by the battery box environment monitoring and calculation module, judges the possibility and rate of condensation, and adjusts the power of the variable power cooling fan to change the intensity of condensate evaporation on the battery liquid cooling plate.

2. The low-energy-consumption, anti-condensation thermal management system for energy storage batteries according to claim 1, characterized in that: The chiller unit and pump unit (2) are connected to the energy storage battery (1) through the chilled water circulation pipe (3).

3. The low-energy-consumption, anti-condensation thermal management system for energy storage batteries according to claim 2, characterized in that: The circulating cold water temperature sensor (5) is arranged on the cold water circulation pipe (3).

4. The low-energy-consumption, anti-condensation thermal management system for energy storage batteries according to claim 1, characterized in that: The airflow outlet of the variable power cooling fan (7) is sealed to the air guide bend (8), and the outlet of the air guide bend faces the bottom of the battery liquid cooling plate (4).

5. A low-energy-consumption, anti-condensation thermal management system for energy storage batteries according to claim 1, characterized in that: The battery box air temperature sensor (9) and battery box air humidity sensor (10) are arranged inside the energy storage battery box. The battery box air temperature sensor (9) and battery box air humidity sensor (10) are in direct contact with the air and measure the air temperature and relative humidity inside the energy storage battery box.

6. The low-energy-consumption, anti-condensation thermal management system for energy storage batteries according to claim 1, characterized in that: It also includes a control cabinet (13), a variable operating condition water temperature control module (6), a battery box environmental monitoring and calculation module (11), and an enhanced evaporation control module (12), all of which are located in the control cabinet (13).

7. A low-energy-consumption, anti-condensation thermal management system for energy storage batteries according to claim 1, characterized in that: The battery box environment monitoring and calculation module (11) receives the measurement data fed back by the battery box air temperature sensor and the battery box air humidity sensor in real time, and calculates the dew point temperature of the humid air inside the battery box based on the measurement data fed back by the battery box air temperature sensor and the battery box air humidity sensor.

8. A control method for a low-energy-consumption, anti-condensation thermal management system for an energy storage battery according to any one of claims 1 to 7, characterized in that, When the energy storage battery starts or stops charging or discharging, or when the charging / discharging rate changes, the following steps are included: (1) The variable operating condition water temperature control module queries the liquid cooling performance database corresponding to the current battery charge / discharge rate to obtain the maximum circulating cooling water temperature T required for the battery liquid cooling plate under the set charge / discharge rate. water ; (2) The variable operating condition water temperature control module collects the current circulating cold water temperature T through the circulating cold water temperature sensor; (3) The battery box environmental monitoring and calculation module collects the current air temperature T inside the battery box through the battery box air temperature sensor and the battery box air humidity sensor. air Calculate the relative humidity (RH) and the current dew point temperature (T) inside the battery compartment. d ; (4) The variable-condition water temperature control module sets the required circulating cold water temperature T water to be compared with the current circulating cold water temperature T. If T water <T-0.1°C, the operating power of the chiller unit and the pump unit is increased, so that the circulating cold water temperature T in the battery liquid cooling plate decreases; if T water >T+0.1°C, the operating power of the chiller unit and the pump unit is reduced, so that the circulating cold water temperature T in the battery liquid cooling plate rises; if T-0.1°C ≤ T water ≤T+0.1°C, the chiller unit and the pump unit maintain the current operating power unchanged, and the circulating cold water temperature T in the battery liquid cooling plate remains unchanged; (5) Enhance the evaporation control module by comparing the current circulating cold water temperature T with the current dew point temperature T inside the battery box. d For comparison, if T≥T d If T d -10℃≤T <T d This causes the variable power cooling fan to change its operating power, adjusting the airflow speed at the outlet of the air guide bend to achieve the first set speed; if T <T d At -10℃, the variable power cooling fan changes its operating power, and the airflow speed at the outlet of the air guide bend is adjusted so that the airflow speed at the outlet of the air guide bend reaches the second set speed. Repeat steps (2) to (5) while the battery is at its current charge / discharge rate.

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