CN118009561A - Energy storage equipment and optical storage system - Google Patents

Abstract

The application discloses energy storage equipment and an optical storage system. The thermal management system of the energy storage device includes a compressor, a condenser, an expansion valve, a dehumidification module, and a first evaporator, the dehumidification module including a second evaporator. The refrigerant outlet of the compressor is connected with the refrigerant inlet of the condenser, and the refrigerant outlet of the condenser is connected with the refrigerant inlet of the expansion valve. The refrigerant outlet of the expansion valve is connected with the refrigerant inlet of the second evaporator, the refrigerant outlet of the second evaporator is connected with the refrigerant inlet of the first evaporator, and the refrigerant outlet of the first evaporator is connected with the refrigerant inlet of the compressor. In the heat management system of the energy storage device, the first evaporator is used for heating the refrigerant flowing out of the refrigerant outlet of the second evaporator, so that the suction superheat degree of the compressor can be improved, the risk of the liquid refrigerant impacting the compressor is reduced, the operation safety of the compressor is improved, and the operation reliability of the energy storage device and the light storage system is improved.

Description

Energy storage equipment and optical storage system

Technical Field

The application relates to the technical field of energy, in particular to energy storage equipment and an optical storage system.

Background

With the continued development of clean energy sources, energy storage devices for storing electrical energy are beginning to be widely used in a variety of fields. Currently, there are more and more large energy storage devices at the cabinet or container level to boost the electrical energy storage capacity of the energy storage device by configuring more batteries.

The heat management system is generally configured in the energy storage device to perform heat management on loads such as a battery and a power module in the device, so that the temperature of the battery and the power module can be kept within a reasonable temperature range, and normal operation of the energy storage device is ensured. In addition, the thermal management system may integrate a dehumidification module to reduce the humidity inside the energy storage device, thereby reducing the risk of corrosion of the load in the energy storage device. In general, the dehumidification module is connected to the outlet of the compressor, but is limited by the installation space of the thermal management system in the energy storage device, and the dehumidification module cannot be designed to have an excessively large size, which easily causes no overheating of the air suction of the compressor, so that the impact of the liquid refrigerant on the compressor is caused, and the compressor is damaged seriously.

Disclosure of Invention

The application provides energy storage equipment and an optical storage system, which are used for increasing the suction superheat degree of a compressor, so that the safe operation of the compressor is ensured, and the operation reliability of the energy storage equipment is improved.

In a first aspect, the present application provides an energy storage device comprising a thermal management system comprising a compressor, a condenser, an expansion valve, a dehumidification module, and a first evaporator, the dehumidification module comprising a second evaporator. The refrigerant outlet of the condenser is connected with the refrigerant inlet of the expansion valve. The refrigerant outlet of the expansion valve is connected with the refrigerant inlet of the second evaporator, the refrigerant outlet of the second evaporator is connected with the refrigerant inlet of the first evaporator, and the refrigerant outlet of the first evaporator is connected with the refrigerant inlet of the compressor. In the heat management system of the energy storage device, the first evaporator and the second evaporator of the dehumidification module are connected in series to the same refrigerant circulation loop, and the first evaporator is positioned at one side of the refrigerant outlet of the second evaporator, so that the refrigerant flowing out of the refrigerant outlet of the second evaporator can be heated by the first evaporator, the refrigerant flowing to the refrigerant inlet of the compressor can be heated, the suction superheat degree of the compressor can be improved, the risk that liquid refrigerant impacts the compressor can be reduced, the operation safety of the compressor can be improved, and the operation reliability of the energy storage device can be improved. In addition, the heat management system of the energy storage device is designed by adopting the scheme provided by the application, and the expansion valve with a slightly larger caliber can be selected while the suction superheat degree of the compressor is ensured, so that the possibility of dirty blockage of the expansion valve can be effectively reduced, the requirement of the heat management system on the cleanliness of the refrigerant is reduced, and the cost of the heat management system can be reduced while the operation reliability of the heat management system is improved. In addition, compared with the scheme that the first evaporator and the second evaporator are connected in parallel in the existing thermal management system, the thermal management system of the energy storage device can save at least one expansion valve and one temperature sensor, and is beneficial to reducing the cost of the thermal management system.

In one possible implementation of the present application, the dehumidifying module further includes a first fan, and an air outlet of the first fan is disposed toward the second evaporator. The first fan is used for blowing air in the energy storage device to the second evaporator, so that the circulation speed of the air flowing through the second evaporator is accelerated, the temperature of the second evaporator is reduced, and the dehumidification effect of the dehumidification module is improved.

In one possible implementation of the present application, the thermal management system further comprises a bypass valve, a refrigerant inlet of the bypass valve being connected to a refrigerant inlet of the second evaporator, and a refrigerant outlet of the bypass valve being connected to a refrigerant outlet of the second evaporator. The bypass valve is placed in parallel with the second evaporator. Therefore, when the energy storage equipment has no dehumidification requirement, the bypass valve is opened to bypass the second evaporator, so that the pressure drop of the refrigerant flowing through the first evaporator is smaller, the flow resistance is small, the heat exchange quantity of the first evaporator is favorably improved, and the energy efficiency of the heat management system is improved.

In one possible implementation of the present application, the thermal management system further includes a four-way valve, the refrigerant inlet of the first evaporator is connected to a first port of the four-way valve, the refrigerant outlet of the second evaporator is connected to a second port of the four-way valve, the refrigerant inlet of the second evaporator is connected to a third port of the four-way valve, and the refrigerant outlet of the expansion valve is connected to a fourth port of the four-way valve. Therefore, when the first valve port of the four-way valve is communicated with the second valve port of the four-way valve and the third valve port of the four-way valve is communicated with the fourth valve port of the four-way valve, the first evaporator and the second evaporator can be connected in series, and the dehumidification function of the dehumidification module can be achieved. In addition, when the energy storage equipment has no dehumidification requirement, the first valve port of the four-way valve is communicated with the fourth valve port of the four-way valve, the second valve port of the four-way valve is communicated with the third valve port of the four-way valve, at the moment, the second evaporator is bypassed, and the refrigerant enters the compressor through the first evaporator, so that the pressure drop of the refrigerant flowing through the first evaporator is smaller, the flow resistance is smaller, the heat exchange quantity of the first evaporator is favorably improved, and the energy efficiency of the thermal management system is improved.

In one possible implementation of the application, the energy storage device further comprises a battery module, a power module and a heat sink, the battery module comprising a battery and a battery heat exchange plate, the battery being in contact with the battery heat exchange plate. The power module comprises a power circuit and a power circuit heat exchange plate. In addition, the thermal management system further comprises a multi-way valve, the cooling liquid outlet of the first evaporator is connected with the first valve port of the multi-way valve, and the cooling liquid inlet of the first evaporator is connected with the second valve port of the multi-way valve. The cooling liquid outlet of the battery heat exchange plate is connected with the third valve port of the multi-way valve, and the cooling liquid inlet of the battery heat exchange plate is connected with the fourth valve port of the multi-way valve. The cooling liquid outlet of the power circuit board is connected with the fifth valve port of the multi-way valve, the cooling liquid inlet of the power circuit board is connected with the cooling liquid outlet of the condenser, and the cooling liquid inlet of the condenser is connected with the sixth valve port of the multi-way valve. The cooling liquid outlet of the radiator is connected with the seventh valve port of the multi-way valve, and the cooling liquid inlet of the radiator is connected with the eighth valve port of the multi-way valve. Therefore, different connection modes among the cooling liquid passages can be realized by controlling the conduction state among the valve ports of the multi-way valve, and a plurality of different cooling liquid circulation loops are formed among the cooling liquid passages so as to provide feasibility conditions for realizing a plurality of working modes of the thermal management system.

In one possible implementation of the present application, the thermal management system further includes an electric heater, a cooling fluid inlet of the electric heater is connected to the fourth valve port of the multi-way valve, and a cooling fluid outlet of the electric heater is connected to a cooling fluid inlet of the battery heat exchange plate. In this way, in a low-temperature scene, the electric heater can be used for heating the cooling liquid entering the battery heat exchange plate, and then heat is transferred to the battery through the battery heat exchange plate, so that the battery is heated.

In one possible implementation of the present application, the thermal management system further comprises a first pump and a second pump, the coolant outlet of the first pump being connected to the coolant inlet of the first evaporator, the coolant inlet of the first pump being connected to the second valve port of the multi-way valve, or the coolant inlet of the first pump being connected to the coolant outlet of the first evaporator, the coolant outlet of the first pump being connected to the first valve port of the multi-way valve. The cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the condenser, the cooling liquid inlet of the second pump is connected with the sixth valve port of the multi-way valve, or the cooling liquid inlet of the second pump is connected with the cooling liquid outlet of the condenser, and the cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the heat exchange plate of the power circuit. This may allow the first pump to be disposed in one coolant passage of the thermal management system and the second pump to be disposed in the other coolant passage of the thermal management system, and may allow at least one of the first pump and the second pump to be included in each coolant circulation circuit that may be formed in the thermal management system to drive the circulation flow of the coolant in the respective coolant circulation circuit.

In one possible implementation manner of the application, the thermal management system further comprises a fluid supplementing kettle, and the fluid supplementing kettle can supplement fluid for at least one cooling fluid circulation loop in the thermal management system, which is beneficial to meeting the demand of the thermal management system for cooling fluid in different working modes, so that the cooling fluid in each cooling fluid circulation loop is ensured to be in a better flow all the time, and the reliability and the stability of the operation of the thermal management system are improved.

In addition, when the cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the condenser, and the cooling liquid inlet of the second pump is connected with the sixth valve port of the multi-way valve, the liquid supplementing kettle is arranged between the second pump and the sixth valve port of the multi-way valve. Or when the cooling liquid inlet of the second pump is connected with the cooling liquid outlet of the condenser, and the cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the power circuit heat exchange plate, the liquid supplementing kettle is arranged between the power circuit heat exchange plate and the fifth valve port of the multi-way valve. In this way, the fluid supplementing kettle can be used for containing redundant cooling fluid after being heated and expanded in the cooling fluid circulation loop of the thermal management system, so that the risk of cracking of a connecting pipeline in the cooling fluid circulation loop due to overlarge pressure is reduced.

In one possible implementation of the application, the first evaporator is a plate heat exchanger. The second evaporator is a micro-channel heat exchanger or a tube-fin heat exchanger. Therefore, the heat exchange effect of the first evaporator can be ensured, and the first evaporator can effectively heat the refrigerant flowing out from the refrigerant outlet of the second evaporator, so that the purpose of improving the suction superheat degree of the compressor is achieved.

In a second aspect, the present application further provides a light storage system, which includes a photovoltaic power generation device, a power conversion device, and the energy storage device in the first aspect, where the power device is connected between the photovoltaic power generation device and the energy storage device. The photovoltaic power generation device is used for storing generated electric energy to the energy storage device through the power conversion device, so that the energy storage device is used for storing the electric energy. By applying the energy storage equipment, the operation reliability of the optical storage system can be effectively improved.

In a third aspect, the present application also provides a charging network, which may include a charging pile and the energy storage device of the first aspect, where the charging pile is electrically connected to the energy storage device, and the energy storage device is used to provide electric energy to the charging pile. By applying the energy storage equipment, the operation reliability of the charging network can be effectively improved.

Drawings

Fig. 1 is a schematic diagram of an application scenario of an energy storage device according to an embodiment of the present application;

fig. 2 is a schematic diagram of another application scenario of the energy storage device according to the embodiment of the present application;

Fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a conventional energy storage device according to an embodiment of the present application;

fig. 5 is a schematic diagram of a system structure of an energy storage device according to an embodiment of the present application;

FIG. 6 is a schematic diagram of another system structure of an energy storage device according to an embodiment of the present application;

FIG. 7 is a schematic diagram of another system structure of an energy storage device according to an embodiment of the present application;

fig. 8 is a schematic diagram of a system structure of the energy storage device shown in fig. 7 in a working mode without dehumidification requirement.

1000-An energy storage device; 100-a cabinet body; 1001-cabinet door; 200-battery module; 210-battery; 220-battery heat exchange plate;

2201-cooling liquid inlet of battery heat exchange plate; 2202-cooling liquid outlet of battery heat exchange plate; 300-power module; 310-power circuit;

320-a power circuit heat exchange plate; 3201-cooling liquid inlet of heat exchange plate of power circuit; 3202-cooling liquid outlet of heat exchange plate of power circuit;

400-thermal management system; 410-a compressor; 4101—a refrigerant inlet of the compressor; 4102-a refrigerant outlet of the compressor; 420-a condenser;

4201—refrigerant inlet of condenser; 4202-refrigerant outlet of condenser; 4203—a cooling liquid inlet of a condenser;

4204—cooling liquid outlet of condenser; 430-an expansion valve; 430 a-a first expansion valve; 430 b-a second expansion valve;

4301-refrigerant inlet of expansion valve; 4302-refrigerant outlet of expansion valve; 4301 a-a refrigerant inlet of a first expansion valve;

4301 b-refrigerant inlet of a second expansion valve; 440-a first evaporator; 4401-a refrigerant inlet of a first evaporator;

4402-a refrigerant outlet of the first evaporator; 4403-a cooling fluid inlet of the first evaporator; 4404-a coolant outlet of the first evaporator;

450-dehumidification module; 4501-a second evaporator; 45011-refrigerant inlet of the second evaporator; 45012-refrigerant outlet of the second evaporator;

4502-a first fan; 460-multi-way valve; 470-electric heater; 4701-coolant inlet of electric heater;

4702-coolant outlet of electric heater; 480-a first pump; 4801—a cooling fluid inlet of a first pump; 4802—a coolant outlet of the first pump;

490-second pump; 4901-a cooling fluid inlet of a second pump; 4902-a coolant outlet of the second pump; 4100—a fluid infusion pot; 4110-bypass valve;

41101 refrigerant inlet to bypass valve; 41102 refrigerant outlet of bypass valve; 4120-four-way valve; 500-a heat sink module;

510-a heat sink; 5101—a coolant inlet of the radiator; 5102—a coolant outlet of the radiator; 520-a second fan;

t1, T2-temperature sensor;

a-a first cooling liquid passage; b-a second cooling liquid passage; c-a third cooling liquid passage; d-a fourth cooling liquid passage;

v 1-the first port of the multiway valve; v 2-the second port of the multiway valve; v 3-third port of the multiway valve; v 4-fourth port of the multiway valve;

v 5-fifth port of the multiway valve; v 6-sixth port of the multiway valve; v 7-seventh port of the multiway valve; v 8-eighth port of the multiway valve;

a1-a first valve port of the four-way valve; a 2-the second valve port of the four-way valve; a 3-the third valve port of the four-way valve; a 4-the fourth valve port of the four-way valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail with reference to the accompanying drawings. However, the example embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words of the expression position and the direction described in the embodiment of the application are described by taking the attached drawings as an example, but can be changed according to the requirement and are all included in the protection scope of the application. The drawings of the embodiments of the present application are merely for illustrating relative positional relationships and are not to scale.

It is noted that in the following description, specific details are set forth in order to provide an understanding of the application. The embodiments of the application may be practiced in a variety of other ways than those described herein, and those of skill in the art will readily appreciate that many modifications are possible without materially departing from the spirit of the application. Therefore, the present application is not limited by the specific embodiments disclosed below.

An energy storage device is a device that can store electrical energy through a medium and release the stored energy to generate electricity when needed. The energy storage device can be applied to five industrial and commercial energy storage scenes such as small-scale businesses (e.g. small-scale factories and the like), medium-scale businesses, large-scale businesses, optical storage and charging stations, medium-scale micro-grids (e.g. islands and the like), and three power station scenes such as wind-light energy storage power stations, power grid energy storage power stations and large-scale micro-grids.

Referring to fig. 1, fig. 1 is a schematic diagram of an application scenario of an energy storage device according to an embodiment of the present application, where an optical storage system is taken as an example for illustration. The optical storage system may include a power conversion device connected between the power generation device and the energy storage device, a power generation device for storing generated electric energy into the energy storage device through the power conversion device, and the energy storage device.

In some embodiments, the power generation device may be a photovoltaic power generation device that may be used to convert light energy into direct current electrical energy.

In some embodiments, the power generation device may be a wind power generation device that may be used to convert wind energy into direct current electrical energy.

Fig. 2 is a schematic diagram of another application scenario of the energy storage device according to the embodiment of the present application, where the application scenario is illustrated by taking a charging network as an example. The charging network comprises a charging pile and energy storage equipment, wherein the charging pile is electrically connected with the energy storage equipment through a cable, and the energy storage equipment can provide the electric energy stored by the energy storage equipment for the charging pile. The charging post has a connector that can be connected to a powered device (e.g., a vehicle) to charge the powered device.

In addition, in the embodiment of the application, the energy storage equipment can be classified into cabinet-level energy storage equipment and container-level energy storage equipment according to different requirements of application scenes on electricity consumption. Referring to fig. 3, fig. 3 is a schematic structural diagram of an energy storage device 1000 according to an embodiment of the present application, where a cabinet-level energy storage device is taken as an example. The energy storage device 1000 may include a cabinet 100, a battery module 200, and a power module 300. The battery module 200 and the power module 300 can be both accommodated in the cabinet 100, the battery module 200 is a basic unit for the energy storage device 1000 to store and release electric energy, and the power module 300 can be used for controlling the charging and discharging processes of the battery. For example, the power module 300 may include an energy storage converter (power conversion system, PCS) or a direct current converter (DCDC). The PCS may be used to convert ac power into dc power and provide the dc power to the battery, or convert dc power from the battery into ac power and output the ac power, and the DCDC may be used to boost the voltage of the battery module 200, so as to ensure that the total voltage of the battery module 200 is not lower than the rated voltage, and improve the operation stability of the battery module 200.

In the above energy storage device, the battery module 200 and the power module 300 are the main thermal loads in the energy storage device 1000, and the temperatures of the battery module 200 and the power module 300 are important conditions affecting whether the energy storage device 1000 can normally operate. For the battery module 200, in an environment with a higher temperature, such as summer or spring-autumn transition season, the battery module 200 generates more heat during the charge-discharge process, and in this case, the battery module 200 needs to be cooled to ensure the normal operation of the battery module 200; in winter with relatively low temperature, the battery module 200 may cause a charge-discharge failure due to low temperature, so that the battery module 200 needs to be heated to ensure the normal operation of the battery module 200. For the power module 300, since the power module 300 always generates a large amount of heat during the operation, the power module 300 needs to be cooled in time under various environmental conditions to ensure the normal operation thereof.

In addition, in some cases, such as in low temperature and high humidity environments, the battery module and the power module also have a need for dehumidification to reduce the risk of corrosion damage to the battery module and the power module.

Based on this, a thermal management system 400 is also provided in the present energy storage device 1000. As shown in fig. 3, currently, in order to make reasonable use of the space within the cabinet 100 of the energy storage device 100, the thermal management system 400 may be disposed on a cabinet door 1001 of the cabinet 100.

The thermal management system 400 can simultaneously meet the management requirements of the temperature and humidity of the battery module 200 and the power module 300, and when the thermal management system is specifically set, reference may be made to fig. 4, and fig. 4 is a schematic structural diagram of a conventional energy storage device according to an embodiment of the present application, which shows a setting manner of the thermal management system of the energy storage device. The thermal management system includes a compressor 410, a condenser 420, a first expansion valve 430a, and a first evaporator 440, and the compressor 410, the condenser 420, the first expansion valve 430a, and the first evaporator 440 are sequentially connected to form a refrigerant circulation loop.

In addition, in the energy storage device shown in fig. 4, the thermal management system further includes a dehumidification module 450 and a second expansion valve 430b, the dehumidification module 450 includes a second evaporator 4501, the second evaporator 4501 is connected in series with the second expansion valve 430b, and a refrigerant outlet 45012 of the second evaporator and a refrigerant outlet 4402 of the first evaporator are both connected to a refrigerant inlet 4101 of the compressor, and a refrigerant inlet 4301b of the second expansion valve and a refrigerant inlet 4301a of the first expansion valve are both connected to a refrigerant outlet 4202 of the condenser, thereby realizing parallel connection of the second evaporator 4501 and the first evaporator 440.

The second evaporator 4501 in the dehumidification module 450 cannot be oversized due to the limited space in which the thermal management system is located in the energy storage device. In addition, in low temperature and high humidity environments, the thermal management system is less loaded, for example less than 700W. This results in a smaller heat transfer capacity of the second evaporator 4501, which tends to result in a smaller or no suction superheat of the compressor 410, thereby causing an impact of the liquid refrigerant on the compressor 410, and in severe cases, causing damage to the compressor 410.

Therefore, the energy storage device provided by the embodiment of the application can heat the refrigerant flowing out of the refrigerant outlet of the dehumidification module under the condition that the energy storage device has dehumidification requirements by adjusting the setting position of the dehumidification module in the thermal management system, which is beneficial to improving the suction superheat degree of the compressor, thereby improving the operation safety of the compressor and further improving the operation reliability of the energy storage device. In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 5, fig. 5 is a schematic system structure of an energy storage device according to an embodiment of the present application. In the energy storage device, the thermal management system includes a compressor 410, a condenser 420, an expansion valve 430, a dehumidification module 450, and a first evaporator 440, wherein the dehumidification module 450 includes a second evaporator 4501, the second evaporator 4501 can be a microchannel heat exchanger or a tube-fin heat exchanger, and the first evaporator 440 can be a plate heat exchanger.

As shown in fig. 5, the refrigerant outlet 4102 of the compressor is connected to the refrigerant inlet 4201 of the condenser, the refrigerant outlet 4202 of the condenser is connected to the refrigerant inlet 4301 of the expansion valve, the refrigerant outlet 4302 of the expansion valve is connected to the refrigerant inlet 45011 of the second evaporator, the refrigerant outlet 45012 of the second evaporator is connected to the refrigerant inlet 4401 of the first evaporator, and the refrigerant outlet 4402 of the first evaporator is connected to the refrigerant inlet 4101 of the compressor, so that the compressor 410, the condenser 420, the expansion valve 430, the first evaporator 440, and the second evaporator 4501 are sequentially connected to form a refrigerant circulation circuit. The refrigerant may circulate in the above-described refrigerant circulation circuit, wherein the refrigerant may be, but is not limited to, freon or liquid ammonia compound, or the like.

In an embodiment of the present application, when the refrigerant flows through the second evaporator 4501, the temperature of the second evaporator 4501 is lower, so that when the air humidity in the energy storage device is higher and the temperature of the second evaporator 4501 is lower than the dew point temperature of the air, the moisture in the air is condensed into water droplets, and is discharged through the drain pipeline of the energy storage device, so as to reduce the humidity in the energy storage device.

It will be appreciated that the second evaporator 4501 may also reduce the temperature of the air within the energy storage device, as the temperature of the second evaporator 4501 is lower during the circulating flow of refrigerant in the above-described refrigerant circulation circuit. In addition, the dehumidification module 450 further includes a first fan 4502, an air outlet of the first fan 4502 is disposed towards the second evaporator 4501, and the first fan 4502 is configured to blow air in the energy storage device towards the second evaporator 4501, so as to accelerate a circulation speed of air flowing through the second evaporator 4501, so as to reduce a temperature of the second evaporator 4501, which is beneficial to enhancing a dehumidification effect of the dehumidification module 450.

In the thermal management system of the energy storage device provided by the application, the first evaporator 440 and the second evaporator 4501 of the dehumidification module 450 are connected in series to the same refrigerant circulation loop, and the first evaporator 440 is positioned at one side of the refrigerant outlet 45012 of the second evaporator, so that the refrigerant flowing out of the refrigerant outlet 45012 of the second evaporator can be heated by the first evaporator 440, thereby heating the refrigerant flowing to the refrigerant inlet 4101 of the compressor, which is beneficial to improving the suction superheat degree of the compressor 410, reducing the risk of liquid refrigerant impacting the compressor 410, improving the operation safety of the compressor 410, and further improving the operation reliability of the energy storage device.

In addition, the heat management system of the energy storage device is designed by adopting the scheme provided by the application, and the expansion valve 430 with a slightly larger caliber can be selected while guaranteeing the suction superheat degree of the compressor 410, so that the possibility of filth blockage of the expansion valve 430 can be effectively reduced, the requirement of the heat management system on the cleanliness of the refrigerant is reduced, and the cost of the heat management system can be reduced while the operation reliability of the heat management system is improved. In addition, since the thermal management system of the present application may include only one expansion valve 430 and one temperature sensor T1 in the energy storage arrangement, and the thermal management system of the present energy storage device shown in fig. 4 includes the first expansion valve 430a, the second expansion valve 430b, the temperature sensor T1 and the temperature sensor T2, the thermal management system of the present energy storage device of the present application may save at least one expansion valve and one temperature sensor compared to the parallel connection scheme of the first evaporator 440 and the second evaporator 4501 in the present thermal management system, which is beneficial to reducing the cost of the thermal management system.

In the present application, the specific type of the expansion valve 430 is not limited, and an electronic expansion valve is exemplified to improve the adjustment accuracy of the expansion valve 430.

With continued reference to fig. 5, in the energy storage device provided by the present application, the thermal management system further includes a multi-way valve 460, the coolant outlet 4404 of the first evaporator is connected to the first valve port v1 of the multi-way valve, and the coolant inlet 4403 of the first evaporator is connected to the second valve port v2 of the multi-way valve, so as to connect the coolant flow channel of the first evaporator 440 to the multi-way valve 460, thereby connecting the first evaporator 440 to the multi-way valve 460 through a coolant pipe to form a first coolant channel a. In the present application, the coolant passage may be used for circulation of a coolant, wherein the coolant may be, but is not limited to, water or ethylene glycol, or the like.

It should be noted that in the embodiment of the present application, the connection between the cooling liquid outlet and the cooling liquid inlet of each device and the multi-way valve 460 may be a direct connection or an indirect connection. Wherein, the direct connection means that only a coolant pipeline is arranged between the coolant outlet and the coolant inlet and the corresponding valve port of the multi-way valve 460, and the indirect connection means that other devices are connected in series between the coolant outlet and the coolant inlet and the corresponding valve port of the multi-way valve 460 through the coolant pipeline.

The energy storage device provided by the embodiment of the application further comprises a battery module 200, wherein the battery module 200 comprises a battery 210 and a battery heat exchange plate 220, and the battery 210 is in contact with the battery heat exchange plate 220. The cooling liquid outlet 2202 of the battery heat exchange plate is connected with the third valve port v3 of the multi-way valve, and the cooling liquid inlet 2201 of the battery heat exchange plate is connected with the fourth valve port v4 of the multi-way valve, so that the battery heat exchange plate 220 and the multi-way valve 260 are connected through a cooling liquid pipeline to form a second cooling liquid passage B.

It should be noted that, in the energy storage device provided in the embodiment of the present application, the battery heat exchange plate 220 may be a cold plate or may be another type of heat exchanger such as a submerged heat exchanger, so long as the heat exchange plate can be used for circulating cooling liquid and can be used for realizing heat exchange with the battery 210.

As shown in fig. 5, the energy storage device further includes a power module 300, the power module 300 includes a power circuit 310 and a power circuit heat exchange plate 320, and the power circuit 310 is in contact with the power circuit heat exchange plate 320. The cooling liquid outlet 3202 of the power circuit heat exchange plate is connected with the fifth valve port v5 of the multi-way valve, the cooling liquid inlet 3201 of the power circuit heat exchange plate is connected with the cooling liquid outlet 4204 of the condenser, and the cooling liquid inlet 4203 of the condenser is connected with the sixth valve port v6 of the multi-way valve, so that the condenser 420 and the power circuit heat exchange plate 320 are connected with the multi-way valve 460 through a cooling liquid pipeline to form a third cooling liquid passage C.

It should be noted that, in the energy storage device provided in the embodiment of the present application, the power circuit heat exchange plate 320 may be a cold plate or another type of heat exchanger such as a submerged heat exchanger. In addition, when the battery heat exchange plate 220 and the power circuit heat exchange plate 320 are both submerged heat exchangers, they may be integrally disposed, that is, the battery 210 and the power circuit 310 may be submerged in the same submerged heat exchanger.

With continued reference to fig. 5, the energy storage device provided by the present application may further include a radiator module 500, where the radiator module 500 includes a radiator 510, a coolant outlet 5102 of the radiator is connected to a seventh valve port v7 of the multi-way valve, and a coolant inlet 5101 of the radiator is connected to an eighth valve port v8 of the multi-way valve, so that the radiator 510 and the multi-way valve 460 are connected through a coolant pipe to form a fourth coolant passage D.

In addition, the radiator module 500 may further include a second fan 520, where the second fan 520 is disposed close to the radiator 510, and the second fan 520 may be used to accelerate the circulation speed of the air flowing through the radiator 510, thereby improving the heat dissipation performance of the radiator 510.

In the present application, the specific arrangement of the multi-way valve 460 is not limited, and an exemplary embodiment thereof may include an eight-way valve to provide eight ports for the connection of the four coolant passages described above through the eight-way valve. Or the multi-way valve 460 may also include two four-way valves to provide eight ports through two four-way valve connections. Of course, other possible arrangements of the multi-way valve 460 are possible, which are not described here.

In the energy storage device provided by the embodiment of the application, the four cooling liquid passages are connected through eight valve ports of the multi-way valve 460, so that different connection modes among the four cooling liquid passages can be realized by controlling the conduction state among the valve ports of the multi-way valve 460, and a plurality of different cooling liquid circulation loops are formed among the four cooling liquid passages, so that a feasible condition is provided for realizing a plurality of working modes of the thermal management system. And, the four cooling liquid passages are connected by the multi-way valve 460, so that the integration level of the thermal management system can be improved, and the connecting pipeline of the thermal management system can be simplified, thereby being beneficial to improving the energy efficiency of the thermal management system.

In a specific application, different cooling liquid passages can be conducted to form different cooling liquid circulation loops by controlling the conduction states of the valve ports of the multi-way valve 460 according to the thermal management requirements of the energy storage device in different scenes. The coolant circulation loop that the thermal management system may form is described next for several possible scenarios.

In the first scene, a first valve port v1 of the multi-way valve, a fourth valve port v4 of the multi-way valve, a second valve port v2 of the multi-way valve, a third valve port v3 of the multi-way valve, a fifth valve port v5 of the multi-way valve, an eighth valve port v8 of the multi-way valve, a sixth valve port v6 of the multi-way valve and a seventh valve port v7 of the multi-way valve are conducted. In this case, the first coolant passage a and the second coolant passage B are connected to form a first coolant circulation circuit, and the third coolant passage C and the fourth coolant passage D are connected to form a second coolant circulation circuit. As can be seen from fig. 5, the first coolant circulation loop includes the coolant flow channel of the first evaporator 440 and the battery heat exchange plate 220, and in this case, heat generated from the battery 210 can be transferred to the first evaporator 440 by the circulation flow of the coolant in the first coolant circulation loop, and the coolant cooled by the first evaporator 440 further flows to the battery heat exchange plate 220 for heat exchange. In addition, the second coolant circulation loop includes the coolant flow passage of the condenser 420, the power circuit heat exchange plate 320, and the radiator 510, so that heat can be radiated from the condenser 420 and the power circuit heat exchange plate through the radiator 510 at the same time. As can be seen, the first scenario may be a scenario with a high ambient temperature, such as summer, where the compressor 410 needs to be turned on, and cooling of the battery 210 is achieved by the circulating flow of the refrigerant in the refrigerant circulation loop.

In the second scene, the first valve port v1 of the multi-way valve and the fourth valve port v4 of the multi-way valve, the second valve port v2 of the multi-way valve and the seventh valve port v7 of the multi-way valve, the third valve port v3 of the multi-way valve and the sixth valve port v6 of the multi-way valve, the fifth valve port v5 of the multi-way valve and the eighth valve port v8 of the multi-way valve are conducted. In this case, the first coolant passage a, the second coolant passage B, the third coolant passage C, and the fourth coolant passage D are connected to form a third coolant circulation circuit. The radiator 510 may be used to cool down the battery heat exchange plate 220 and the power circuit heat exchange plate 320 in the course of the circulation flow of the cooling fluid in the third cooling fluid circulation loop, thereby achieving the heat dissipation of the battery 210 and the power circuit 310. It can be seen that the second scenario may be a scenario where the ambient temperature is more suitable, such as spring or autumn, where the compressor 410 may be turned off, or the compressor 410 may be operated in a light load mode.

In the third scenario, the first valve port v1 of the multi-way valve and the eighth valve port v8 of the multi-way valve, the second valve port v2 of the multi-way valve and the seventh valve port v7 of the multi-way valve, the third valve port v3 of the multi-way valve and the sixth valve port v6 of the multi-way valve, and the fourth valve port v4 of the multi-way valve and the fifth valve port v5 of the multi-way valve are conducted. In this case, the first coolant passage a and the fourth coolant passage D are connected to form a fourth coolant circulation circuit, and the second coolant passage B and the third coolant passage C are connected to form a fifth coolant circulation circuit. As can be seen from fig. 5, the fourth cooling liquid circulation loop includes the cooling liquid flow channel of the first evaporator 440 and the radiator 510, so that in this scenario, the cooling liquid enters the radiator 510 after being cooled by the first evaporator 440, and enters the first evaporator 440 again after being heated by heat exchange with air on the surface of the radiator 510 in the radiator 510. In addition, the fifth cooling fluid circulation loop includes the cooling fluid flow channel of the condenser 420, the battery heat exchange plate 220 and the power circuit heat exchange plate 320, so that the cooling fluid enters the power circuit heat exchange plate 320 after heat exchange and temperature rise of the condenser 420, and as a great amount of heat is generated during operation of the power circuit 310, the heat is transferred to the cooling fluid through the power circuit heat exchange plate 320, so as to realize heat dissipation of the power circuit 310, and then the cooling fluid enters the battery heat exchange plate 220, so as to exchange heat with the battery 210 in the battery heat exchange plate 220, and then is cooled, and finally returns to the cooling fluid flow channel of the condenser 420 again, thus completing one cycle. In this case, the power circuit 310 transfers heat to the coolant to thereby cool the battery 210, and absorbs the heat of the coolant to thereby raise the temperature, so that the fifth coolant circulation circuit can also heat the battery by utilizing the waste heat generated by the power circuit 310 to a certain extent, and the waste heat generated by the power circuit 310 can be reasonably utilized to thereby realize efficient use of the heat.

With continued reference to fig. 5, in an embodiment of the present application, the thermal management system further includes an electric heater 470, which electric heater 470 may be disposed in the second coolant passage B, for example. Specifically, the cooling liquid inlet 4701 of the electric heater is connected with the fourth valve port v4 of the multi-way valve, and the cooling liquid outlet 4702 of the electric heater is connected with the cooling liquid inlet 2201 of the battery heat exchange plate. Thus, in a low temperature scenario, the electric heater 470 may be used to heat the coolant entering the battery heat exchange plate 220, thereby transferring heat to the battery 210 through the battery heat exchange plate 220 to effect heating of the battery 210.

It is understood that the electric heater 470 may be disposed in other coolant passages as long as the electric heater 470 can perform a function of heating the coolant entering the battery heat exchange plate 220.

In an embodiment of the present application, the thermal management system may further include a first pump 480 and a second pump 490, the first pump 480 being disposed in one of the four coolant passages of the thermal management system, the second pump 490 being disposed in another of the four coolant passages of the thermal management system, and in the five coolant circulation circuits, at least one of the first pump 480 and the second pump 490 being included in each of the coolant circulation circuits to drive circulation flow of the coolant in the respective coolant circulation circuits.

Based on the above considerations, in one possible embodiment, as shown in fig. 5, the first pump 480 is disposed in the first cooling liquid passage a, and then the first pump 480 is connected in series with the cooling liquid passage of the first evaporator 440. In particular, the first pump 480 is disposed between the first evaporator cooling fluid inlet 4403 and the second valve port v2 of the multi-way valve when the first pump cooling fluid outlet 4802 is connected to the first evaporator cooling fluid inlet 4403 and the first pump cooling fluid inlet 4801 is connected to the second valve port v2 of the multi-way valve. Alternatively, the first pump 480 may be disposed between the coolant outlet 4404 of the first evaporator and the first valve port v1 of the multi-way valve, specifically, the coolant inlet 4801 of the first pump is connected to the coolant outlet 4404 of the first evaporator, and the coolant outlet 4802 of the first pump is connected to the first valve port v1 of the multi-way valve. Thus, the first pump 480 is also provided in the first, third, and fourth coolant circulation circuits.

With continued reference to fig. 5, the second pump 490 is disposed in the third coolant passage C, and the second pump 490 is connected in series with the coolant flow passage of the condenser 420 and the power circuit heat exchange plate 320. Specifically, the coolant outlet 4902 of the second pump is connected to the coolant inlet 4203 of the condenser, and the coolant inlet 4901 of the second pump is connected to the sixth valve port v6 of the multi-way valve, so that the second pump 490 is disposed between the coolant inlet 4203 of the condenser and the sixth valve port v6 of the multi-way valve. Or the second pump's cooling fluid inlet 4901 is connected with the condenser's cooling fluid outlet 4204, the second pump's cooling fluid outlet 4902 is connected with the power circuit heat exchange plate's cooling fluid inlet 3201, and then the second pump 490 is disposed between the condenser 420 and the power circuit heat exchange plate 320. Or the second pump 490 may be provided at other positions in the third coolant passage C. Thus, the second pump 490 is also provided in the second, third, and fifth coolant circulation circuits.

The foregoing is merely an exemplary description of the location of the first pump 480 and the second pump 490 in a thermal management system, and in other possible embodiments of the present application, the specific location of the first pump 480 and the second pump 490 may be adjusted, which are not described herein, but are understood to fall within the scope of the present application.

With continued reference to fig. 5, in an embodiment of the present application, the thermal management system further includes a fluid-supplementing pot 4100, where the fluid-supplementing pot 4100 may be connected to one of the four cooling fluid passages, and since any one of the four cooling fluid passages is directly connected to the same cooling fluid circulation circuit or indirectly connected to other cooling fluid passages through another cooling fluid passage, the fluid-supplementing pot 4100 may supplement any one of the five cooling fluid circulation circuits to satisfy the cooling fluid requirements of the thermal management system in different working modes, so as to ensure that the cooling fluid in each cooling fluid circulation circuit is always in a better flow rate, so as to improve the reliability and stability of the operation of the thermal management system.

In one possible embodiment of the application, a fluid replacement kettle 4100 is connected to the coolant passage with the pump, and the fluid replacement kettle 4100 is positioned adjacent to the pump so that the pump can take fluid from the fluid replacement kettle 4100 at any time. For example, in the embodiment shown in fig. 5, in the case where the first pump 480 is connected to the first cooling liquid passage a and the second pump 490 is connected to the third cooling liquid passage C, the fluid replacement pot 4100 may be connected to the third cooling liquid passage C. Since the heating value of the power circuit 310 is relatively large, after the power circuit heat exchange plate 320 is connected to the third cooling liquid passage C, the cooling liquid will initially heat up after flowing through the power circuit heat exchange plate 320, and then the temperature will rise again after flowing through the condenser 420, and under the effect of high temperature, the cooling liquid in the third cooling liquid passage C has a certain expansion amount, and by connecting the fluid filling pot 4100 to the third cooling liquid passage C, the excess cooling liquid after expansion can be temporarily contained by the fluid filling pot 4100, so as to reduce the risk of rupture of the connecting pipeline in the third cooling liquid passage C due to excessive pressure.

In addition, in the third cooling liquid passage C, when the second pump 490 is connected between the cooling liquid inlet 4203 of the condenser and the sixth valve port v6 of the multi-way valve, the fluid-replenishing kettle 4100 may be provided between the second pump 490 and the sixth valve port v6 of the multi-way valve such that the fluid-replenishing kettle 4100 is provided closer to the sixth valve port v6 of the multi-way valve than the second pump 490, or when the second pump 490 is connected between the cooling liquid outlet 4204 of the condenser and the fifth valve port v5 of the multi-way valve, the fluid-replenishing kettle 4100 may be provided closer to the fifth valve port v5 of the multi-way valve than the cooling liquid outlet 4204 of the condenser, so that the fluid-replenishing kettle 4100 not only can realize the fluid-replenishing function described above, but also can stabilize the inside of the multi-way valve 460, thereby improving the working stability of the multi-way valve 460 in different connection states.

As can be appreciated from the above description of the energy storage device provided by the present application, the first evaporator 440 and the dehumidification module 450 of the thermal management system of the energy storage device may operate independently or may be coupled to effect management of the temperature and/or humidity of the energy storage device. For example, in the second scenario, that is, in the scenario where the ambient temperature is relatively suitable in spring or autumn, but the air humidity is relatively high, the first fan 4502 of the dehumidification module 450 may be activated to implement the dehumidification function of the dehumidification module 450. In addition, the compressor 410 may be operated in a light load mode while at least one of the first and second water pumps 480 and 490 may be activated so that the cooling liquid may circulate in the cooling liquid circulation loop including the cooling liquid flow path of the first evaporator 440, the battery heat exchange plate 220, the cooling liquid flow path of the condenser 420, the power circuit heat exchange plate 320, and the radiator 510, so that heat generated from the battery 210 and the power circuit 310 may be transferred to the first evaporator 440 and exchanged with the refrigerant flowing through the first evaporator 440 by heat exchange of the cooling liquid with the battery heat exchange plate 220 and the power heat exchange plate 320. Since the first evaporator 440 is located at the refrigerant outlet 45012 of the second evaporator, the refrigerant flowing out from the refrigerant outlet 45012 of the second evaporator can be heated by the refrigerant after exchanging heat with the first evaporator 440, so as to raise the suction superheat degree of the compressor 410, so as to ensure the operation safety of the compressor 410.

It will be appreciated that in the above scenario, the first evaporator 440 primarily functions to heat the refrigerant flowing out of the refrigerant outlet 45012 of the second evaporator. In addition, when the suction superheat degree requirement of the compressor 410 is higher, the electric heater 470 can be turned on to heat the cooling liquid by the electric heater 470, so as to further raise the superheat degree of the refrigerant outlet 45012 of the second evaporator, thereby ensuring that the suction superheat degree of the compressor 410 meets the requirement, so that the compressor 410 can be operated safely.

In addition, in the first scenario, that is, in the scenario where the battery 210 has a cooling requirement, the second fan 520 of the dehumidification module 450 may be turned off, and the first water pump 480 and the second water pump 490 may be simultaneously activated, so that the cooling liquid may circulate in the cooling liquid circulation loop including the cooling liquid flow channel of the first evaporator 440 and the battery heat exchange plate 220, so that the cooling liquid transfers the heat generated by the battery 210 to the first evaporator 440, and the cooling liquid cooled by the first evaporator 440 further flows to the battery heat exchange plate 220 to exchange heat, thereby cooling the battery 210.

Referring to fig. 6, fig. 6 is a schematic diagram of another system structure of an energy storage device according to an embodiment of the present application. Unlike the energy storage device shown in fig. 5 described above, in the energy storage device shown in fig. 6, the thermal management system further includes a bypass valve 4110, the refrigerant inlet 41101 of which is connected to the refrigerant inlet 45011 of the second evaporator, the refrigerant outlet 41102 of which is connected to the refrigerant outlet 45012 of the second evaporator, and then the bypass valve 4110 is disposed in parallel with the second evaporator 4501. Therefore, when the energy storage device has no dehumidification requirement, the bypass valve 4110 is opened to bypass the second evaporator 4501, so that the pressure drop of the refrigerant flowing through the first evaporator 440 is smaller, the flow resistance is small, and the heat exchange amount of the first evaporator 440 is improved, and the energy efficiency of the thermal management system is improved.

It should be noted that, in the energy storage device shown in fig. 6, the bypass valve 4110 may be an electromagnetic valve, which is not limited in the present application. In addition, other structures of the energy storage device shown in fig. 6 may be set with reference to the energy storage device shown in fig. 5, which will not be described herein.

Referring to fig. 7, fig. 7 is a schematic diagram of another system structure of an energy storage device according to an embodiment of the present application. Unlike the energy storage device shown in fig. 5 described above, in the energy storage device shown in fig. 7, the thermal management system further includes a four-way valve 4120, the refrigerant inlet 4401 of the first evaporator is connected to the first port a1 of the four-way valve, the refrigerant outlet 45012 of the second evaporator is connected to the second port a2 of the four-way valve, the refrigerant inlet 45011 of the second evaporator is connected to the third port a3 of the four-way valve, and the refrigerant outlet 4302 of the expansion valve is connected to the fourth port a4 of the four-way valve.

In the energy storage device shown in fig. 7, the connection mode between the first evaporator 440 and the second evaporator 4501 can be switched by controlling the conduction state between the respective valve ports of the four-way valve 4120. For example, referring to fig. 7, in the second scenario, that is, in the spring or autumn, the environmental temperature is relatively suitable, but in the scenario where the air humidity is relatively high, the first port a1 of the four-way valve may be controlled to be conducted with the second port a2 of the four-way valve, and the third port a3 of the four-way valve may be controlled to be conducted with the fourth port a4 of the four-way valve, so as to realize the series connection of the first evaporator 440 and the second evaporator 4501.

In addition, when the energy storage device has no dehumidification requirement, referring to fig. 8, fig. 8 is a schematic diagram of a system structure of the energy storage device shown in fig. 7 in an operation mode without dehumidification requirement. The first valve port a1 of the four-way valve is communicated with the fourth valve port a4 of the four-way valve, and the second valve port a2 of the four-way valve is communicated with the third valve port a3 of the four-way valve. At this time, the second evaporator 4501 is bypassed, and the refrigerant enters the compressor 410 through the first evaporator 440, so that the pressure drop of the refrigerant flowing through the first evaporator 440 is smaller, and the flow resistance is smaller, which is beneficial to enhancing the heat exchange capacity of the first evaporator 440, thereby enhancing the energy efficiency of the thermal management system.

In summary, in the embodiment of the present application, the first evaporator 440 and the second evaporator 4501 of the dehumidification module 450 are connected in series to the same refrigerant circulation loop, and the first evaporator 440 is located at one side of the refrigerant outlet 45012 of the second evaporator, so that the refrigerant flowing out of the refrigerant outlet 45012 of the second evaporator can be heated by the first evaporator 440, thereby heating the refrigerant flowing to the refrigerant inlet 4101 of the compressor, which is beneficial to improving the suction superheat degree of the compressor 410, so as to reduce the risk of the liquid refrigerant impacting the compressor 410, thereby improving the operation safety of the compressor 410, and further improving the operation reliability of the energy storage device.

In addition, the heat management system of the energy storage device is designed by adopting the scheme provided by the application, and the expansion valve 430 with a slightly larger caliber can be selected while guaranteeing the suction superheat degree of the compressor 410, so that the possibility of filth blockage of the expansion valve 430 can be effectively reduced, the requirement of the heat management system on the cleanliness of the refrigerant is reduced, and the cost of the heat management system can be reduced while the operation reliability of the heat management system is improved. In addition, compared with the scheme that the first evaporator 440 and the second evaporator 4501 are connected in parallel in the existing thermal management system, the thermal management system of the energy storage device provided by the application can save at least one expansion valve and one temperature sensor, which is beneficial to reducing the cost of the thermal management system.

It will be appreciated that, based on the energy storage device provided in the foregoing embodiment of the present application, some possible adjustments may be made to the structure of the thermal management system of the energy storage device, and the relative positions of the first evaporator 440 and the second evaporator 4501 may be interchanged, that is, the refrigerant inlet 45011 of the second evaporator is connected to the refrigerant outlet 4402 of the first evaporator, and the refrigerant outlet 45012 of the second evaporator is connected to the refrigerant inlet 4401 of the first evaporator, where heating of the refrigerant flowing out from the refrigerant outlet 45012 of the second evaporator may be achieved by adding an additional heat source to achieve the effect of increasing the suction superheat of the compressor 410. Of course, on the basis of this, other possible modifications may be made to the energy storage device provided by the embodiments of the present application, which are not described herein, but are understood to fall within the protection scope of the present application.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (11)

1. An energy storage device comprising a thermal management system comprising a compressor, a condenser, an expansion valve, a dehumidification module, and a first evaporator, the dehumidification module comprising a second evaporator, wherein:

The refrigerant outlet of the compressor is connected with the refrigerant inlet of the condenser, and the refrigerant outlet of the condenser is connected with the refrigerant inlet of the expansion valve; the refrigerant outlet of the expansion valve is connected with the refrigerant inlet of the second evaporator, and the refrigerant outlet of the second evaporator is connected with the refrigerant inlet of the first evaporator; the refrigerant outlet of the first evaporator is connected with the refrigerant inlet of the compressor.

2. The energy storage device of claim 1, wherein the dehumidification module further comprises a first fan having an air outlet disposed toward the second evaporator.

3. The energy storage device of claim 1 or 2, wherein the thermal management system further comprises a bypass valve having a refrigerant inlet connected to the refrigerant inlet of the second evaporator and a refrigerant outlet connected to the refrigerant outlet of the second evaporator.

4. The energy storage device of claim 1 or 2, wherein the thermal management system further comprises a four-way valve, the refrigerant inlet of the first evaporator is connected to a first port of the four-way valve, the refrigerant outlet of the second evaporator is connected to a second port of the four-way valve, the refrigerant inlet of the second evaporator is connected to a third port of the four-way valve, and the refrigerant outlet of the expansion valve is connected to a fourth port of the four-way valve.

5. The energy storage device of any one of claims 1-4, further comprising a battery module, a power module, and a heat sink, the battery module comprising a battery and a battery heat exchange plate, the battery in contact with the battery heat exchange plate; the power module comprises a power circuit and a power circuit heat exchange plate;

the thermal management system further comprises a multi-way valve, wherein a cooling liquid outlet of the first evaporator is connected with a first valve port of the multi-way valve, and a cooling liquid inlet of the first evaporator is connected with a second valve port of the multi-way valve; the cooling liquid outlet of the battery heat exchange plate is connected with the third valve port of the multi-way valve, and the cooling liquid inlet of the battery heat exchange plate is connected with the fourth valve port of the multi-way valve; the cooling liquid outlet of the power circuit board is connected with the fifth valve port of the multi-way valve, the cooling liquid inlet of the power circuit board is connected with the cooling liquid outlet of the condenser, and the cooling liquid inlet of the condenser is connected with the sixth valve port of the multi-way valve; the cooling liquid outlet of the radiator is connected with the seventh valve port of the multi-way valve, and the cooling liquid inlet of the radiator is connected with the eighth valve port of the multi-way valve.

6. The energy storage device of claim 5, wherein the thermal management system further comprises an electric heater, a coolant inlet of the electric heater being connected to the fourth port of the multi-way valve, and a coolant outlet of the electric heater being connected to a coolant inlet of the battery heat exchange plate.

7. The energy storage device of claim 5 or 6, wherein the thermal management system further comprises a first pump and a second pump, the coolant outlet of the first pump being connected to the coolant inlet of the first evaporator, the coolant inlet of the first pump being connected to the second valve port of the multi-way valve, or the coolant inlet of the first pump being connected to the coolant outlet of the first evaporator, the coolant outlet of the first pump being connected to the first valve port of the multi-way valve;

The cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the condenser, the cooling liquid inlet of the second pump is connected with the sixth valve port of the multi-way valve, or the cooling liquid inlet of the second pump is connected with the cooling liquid outlet of the condenser, and the cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the power circuit heat exchange plate.

8. The energy storage device of claim 7, wherein the thermal management system further comprises a fluid replacement kettle disposed between the second pump and the sixth port of the multi-way valve when the coolant outlet of the second pump is connected to the coolant inlet of the condenser, the coolant inlet of the second pump being connected to the sixth port of the multi-way valve;

Or when the cooling liquid inlet of the second pump is connected with the cooling liquid outlet of the condenser, and the cooling liquid outlet of the second pump is connected with the cooling liquid inlet of the power circuit heat exchange plate, the liquid supplementing kettle is arranged between the power circuit heat exchange plate and the fifth valve port of the multi-way valve.

9. The energy storage device of any one of claims 1-8, wherein the first evaporator is a plate heat exchanger; the second evaporator is a micro-channel heat exchanger or a tube-fin heat exchanger.

10. An optical storage system comprising a power generation device, a power conversion device and an energy storage device according to any one of claims 1 to 9, the power conversion device being connected between the power generation device and the energy storage device, the power generation device being configured to store generated electrical energy into the energy storage device through the power conversion device.

11. A charging network comprising a charging post and an energy storage device according to any one of claims 1 to 9, the charging post being electrically connected to the energy storage device, the energy storage device being arranged to provide electrical energy to the charging post.