Refrigerant unit and energy storage system

Abstract

The invention provides a refrigerant unit and an energy storage system, and relates to the technical field of energy storage. The refrigerant unit is arranged outside the energy storage device; the refrigerant unit comprises a condenser and a compressor, and the compressor is connected with the condenser; the refrigerant unit is provided with an output port and an input port which are used for being connected with the heat exchanger, the input port is used for allowing refrigerants in the heat exchanger to enter the compressor, and the output port is used for allowing refrigerants in the condenser to enter the heat exchanger. The refrigerant unit is provided with an output port and an input port which are connected with the heat exchanger, so that the energy storage device and the refrigerant unit can be respectively produced and transported, the refrigerant unit and the heat exchanger of the energy storage device are assembled after the energy storage device and the heat exchanger reach a destination, and the complex energy storage system can be disassembled into a plurality of parts which are respectively transported to the destination and then assembled. And the transportation and assembly difficulty is reduced. The refrigerant unit is arranged outside the energy storage device, so that more space in the box body of the energy storage device can be used for accommodating the single batteries, and the energy density of the single batteries can be improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a refrigerant unit and an energy storage system. Background Art

[0002] Under the background of vigorous development of power battery vehicles, the existing vehicle thermal management system, in which the power batteries are composed of hundreds or thousands of battery cells, the industry currently mainly adopts liquid cooling technology for such a large system thermal management solution. At present, there is a problem of difficulty in assembly due to the complexity of the system. Summary of the invention

[0003] The embodiments of the present application provide a refrigerant unit and an energy storage system to improve the problem of difficulty in assembly due to the complexity of the energy storage system.

[0004] In a first aspect, an embodiment of the present application provides a refrigerant unit, which is arranged outside an energy storage device; the refrigerant unit is used to provide refrigerant to the heat exchanger of the energy storage device, and the refrigerant unit includes: a condenser and a compressor, and the compressor is connected to the condenser; wherein the refrigerant unit has an output port and an input port for connecting to the heat exchanger, the input port is used to supply the refrigerant in the heat exchanger to enter the compressor, and the output port is used to supply the refrigerant in the condenser to enter the heat exchanger.

[0005] In the above technical solution, the refrigerant unit has an output port and an input port connected to the heat exchanger, so the energy storage device and the refrigerant unit can be produced and transported separately, and the refrigerant unit and the heat exchanger of the energy storage device can be assembled after arriving at the destination, so that the complex energy storage system can be split into multiple parts and transported to the destination for assembly, thereby reducing the difficulty of transportation and assembly. The refrigerant unit is arranged outside the energy storage device, which can make more space inside the box of the energy storage device for accommodating battery cells, which is conducive to improving the energy density of the battery cells.

[0006] In some embodiments of the first aspect of the present application, the refrigerant unit also includes an input pipe, which is connected to the compressor, one end of the input pipe forms the input port, and the input pipe is provided with a first switch component, which is used to enable the input pipe to connect the compressor and the heat exchanger or cut off the compressor and the heat exchanger.

[0007] In the above technical solution, the input pipe is connected to the compressor, and one end of the input pipe forms the input port of the refrigerant unit. The setting of the input pipe is not only convenient for connecting with the heat exchanger of the energy storage device, but also can increase the space for accommodating the refrigerant in the refrigerant unit. If the refrigerant is injected into the pipeline of the refrigerant unit in advance, the setting of the first switch is conducive to reducing the risk of the refrigerant in the pipeline of the refrigerant unit being discharged from the input port before the refrigerant unit is connected to the heat exchanger, and further facilitates the independent production and transportation of the refrigerant unit.

[0008] In some embodiments of the first aspect of the present application, the refrigerant unit also includes an output pipe, which is connected to the condenser, one end of the output pipe forms the output port, and the output pipe is provided with a second switch component, which is used to enable the output pipe to connect the condenser and the heat exchanger or to disconnect the condenser and the heat exchanger.

[0009] In the above technical solution, the output pipe is connected to the condenser, and one end of the output pipe forms the output port of the refrigerant unit. The arrangement of the output pipe is not only convenient for connection with the heat exchanger of the energy storage device, but also can increase the space for accommodating the refrigerant in the refrigerant unit. If the refrigerant is injected into the pipeline of the refrigerant unit in advance, the arrangement of the second switch is conducive to reducing the risk of the refrigerant in the pipeline of the refrigerant unit being discharged from the output port before the refrigerant unit is connected to the heat exchanger, and further facilitates the independent production and transportation of the refrigerant unit.

[0010] In some embodiments of the first aspect of the present application, the refrigerant unit has multiple input ports and multiple output ports, the input ports and the output ports correspond one to one, and one input port and one output port are used to connect to the heat exchanger of one energy storage device.

[0011] In the above technical solution, the refrigerant unit has multiple input ports and multiple output ports, and the input ports and the output ports correspond one to one. One input port and one output port are used to connect to a heat exchanger. Then, the refrigerant unit can be connected to the heat exchangers of multiple energy storage devices, thereby realizing heat exchange between one refrigerant unit and multiple energy storage devices, reducing the number of refrigerant units in the energy storage system, simplifying the structure of the energy storage system, reducing the weight of the energy storage system, and reducing the cost. Through a refrigerant unit, heat exchange can be carried out with the heat exchangers of multiple energy storage devices, simplifying the cooling transfer path scheme, reducing heat transfer losses, and improving heat exchange efficiency.

[0012] In some embodiments of the first aspect of the present application, the refrigerant unit also includes a confluence device, which connects the input end of the compressor and the multiple input ports, and the confluence device is used to converge the refrigerant from the multiple input ports to the input end of the compressor.

[0013] In the above technical solution, the refrigerants from multiple input ports are converged to the input end of the compressor through a converging device, which can reduce the number of interfaces at the input end of the compressor, simplify the structure of the compressor, and facilitate the refrigerant to enter the compressor quickly and smoothly, thereby improving the heat exchange efficiency.

[0014] In some embodiments of the first aspect of the present application, the refrigerant unit includes a plurality of input pipes, each of the input pipes is connected to the confluence device, one end of each of the input pipes forms the input port, and the input pipe is provided with a first switch component, and the first switch component is used to enable the input pipe to connect the compressor and the heat exchanger or disconnect the compressor and the heat exchanger.

[0015] In the above technical solution, each input pipe is connected to the confluence device, so that the input pipe and the compressor are connected through the confluence device. The provision of multiple input pipes is not only convenient for connection with the confluence device, but also can increase the space for accommodating refrigerant in the refrigerant unit. If refrigerant is injected into the pipeline of the refrigerant unit in advance, the provision of the first switch is conducive to reducing the risk of the refrigerant in the pipeline of the refrigerant unit being discharged from the input port before the refrigerant unit is connected to the heat exchanger, and further facilitates the independent production and transportation of the refrigerant unit.

[0016] In some embodiments of the first aspect of the present application, the confluence device includes a plurality of confluences, at least two of the confluences are connected in series, and among the confluences in series, at least one of the confluences is connected to a plurality of input ports.

[0017] In the above technical solution, the confluence device includes multiple confluences, and at least two confluences are connected in series, so that the refrigerant is gradually merged into the compressor, which is conducive to the refrigerant entering the compressor quickly and smoothly, thereby improving the heat exchange efficiency.

[0018] In some embodiments of the first aspect of the present application, the multiple combiners include a first combiner and a second combiner, the first combiner has a plurality of first combiner inlets and a first combiner outlet, the second combiner has a plurality of second combiner inlets and a second combiner outlet, each of the first combiner inlets is connected to at least one of the input ports, the first combiner outlet is connected to one of the second combiner inlets, so as to realize the first combiner and the second combiner being connected in series, the second combiner outlet is connected to the input end of the compressor, and the second combiner inlet is connected to at least one of the input ports.

[0019] In the above technical solution, each first confluence inlet of the first confluence device is connected to at least one input port, and the first confluence outlet of the first confluence device is connected to a second confluence inlet to realize the series connection of the first confluence device and the second confluence device, and the second confluence outlet is connected to the input end of the compressor, and is gradually merged into the compressor with the refrigerant, which is conducive to the refrigerant entering the compressor quickly and smoothly, thereby improving the heat exchange efficiency.

[0020] In some embodiments of the first aspect of the present application, the refrigerant unit also includes a diverter device, which connects the output end of the condenser and the multiple output ports, and the diverter device is used to divert the refrigerant at the output end of the condenser to the multiple output ports.

[0021] In the above technical solution, the flow dividing device allows the refrigerant at the output end of the condenser to be divided into multiple output ports, which is conducive to the refrigerant entering the compressor quickly and smoothly, thereby improving the heat exchange efficiency. It is also conducive to more evenly distributing the refrigerant to each output port, so that the heat exchange capacity of the refrigerant unit and each energy storage device is basically the same, thereby improving the uniformity of heat exchange.

[0022] In some embodiments of the first aspect of the present application, the refrigerant unit includes a plurality of output pipes, each of the output pipes is connected to the diverter device, one end of each of the output pipes forms the output port, and the output pipes are provided with a second switch component, and the second switch component is used to enable the output pipes to connect the condenser and the heat exchanger or to disconnect the condenser and the heat exchanger.

[0023] In the above technical solution, each output pipe is connected to the shunt device, so that the output pipe and the condenser are connected through the shunt device. The arrangement of multiple output pipes is not only convenient for connection with the shunt device, but also can increase the space for accommodating refrigerant in the refrigerant unit. If refrigerant is injected into the pipeline of the refrigerant unit in advance, the arrangement of the second switch is conducive to reducing the risk of the refrigerant in the pipeline of the refrigerant unit being discharged from the output port before the refrigerant unit is connected to the heat exchanger, and further facilitates the independent production and transportation of the refrigerant unit.

[0024] In some embodiments of the first aspect of the present application, the flow splitting device includes a plurality of flow splitters, at least two of the flow splitters are connected in series, and among the flow splitters connected in series, at least one of the flow splitters is connected to a plurality of the output ports.

[0025] In the above technical solution, the diverter device includes multiple diverters, at least two of which are connected in series, so that the refrigerant is diverted to the output port step by step, which is conducive to the rapid and smooth distribution of the refrigerant, improves the heat exchange efficiency, and facilitates more uniform distribution of the refrigerant.

[0026] In some embodiments of the first aspect of the present application, the plurality of diverters include a first diverter and a second diverter, the first diverter having a plurality of first diverter outlets and a first diverter inlet, the second diverter having a plurality of second diverter outlets and a second diverter inlet, each of the first diverter outlets being connected to at least one of the output ports, the first diverter inlet being connected to one of the second diverter outlets to realize the first diverter and the second diverter being connected in series, the second diverter inlet being connected to the output end of the condenser, and the second diverter outlet being connected to at least one of the output ports.

[0027] In the above technical solution, each first diverter outlet of the first diverter is connected to at least one output port, and the first diverter inlet of the first diverter is connected to a second diverter outlet of the second diverter, so as to realize the series connection of the first diverter and the second diverter, which is convenient for the refrigerant to be diverted to the output port step by step, which is beneficial to the rapid and smooth distribution of the refrigerant, improves the heat exchange efficiency, and facilitates more uniform distribution of the refrigerant.

[0028] In some embodiments of the first aspect of the present application, the output end of the compressor and the input end of the condenser are connected through a first pipe, and the first pipe is provided with a third switch element, and the third switch element is used to enable the first pipe to connect the output end of the compressor and the input end of the condenser or cut off the output end of the compressor and the input end of the condenser.

[0029] In the above technical solution, the output end of the compressor and the input end of the condenser are connected through the first pipe, which facilitates the communication between the output end of the compressor and the input end of the condenser. The first pipe can also accommodate refrigerant, so that more refrigerant can be accommodated in the refrigerant unit, which is conducive to improving the heat exchange capacity. The setting of the third switch is convenient for controlling the on-off between the output end of the compressor and the input end of the condenser, thereby facilitating the control of the working state of the refrigerant unit.

[0030] In some embodiments of the first aspect of the present application, the output end of the compressor and the input end of the condenser are connected through a second pipe, and the second pipe is provided with a radiator.

[0031] In the above technical solution, the second pipeline is provided with a radiator, which can release the heat of the refrigerant from the compressor, which is conducive to rapid heat dissipation of the refrigerant, improves heat dissipation efficiency, reduces the power consumption of the condenser, and thus improves the heat exchange capacity.

[0032] In some embodiments of the first aspect of the present application, the radiator is used to be buried underground.

[0033] In the above technical solution, the radiator is buried underground, which can further improve the heat dissipation efficiency of the refrigerant when passing through the heat exchanger. It is also beneficial to reduce the load of the condenser, thereby reducing the demand for air-cooled ventilation volume, and can reduce the number of fans and the fan operating speed, thereby reducing the unit noise and working energy consumption.

[0034] In some embodiments of the first aspect of the present application, the output end of the compressor and the input end of the condenser are connected through a first pipe, and the first pipe is provided with a third switch element, and the third switch element is used to realize that the first pipe connects the output end of the compressor and the input end of the condenser or disconnects the output end of the compressor and the input end of the condenser; the third switch element and the radiator are connected in parallel.

[0035] In the above technical solution, the third switch and the radiator are connected in parallel, and the refrigerant can pass through the passage where the radiator is located and the passage where the third switch is located at the same time, or the cold refrigerant only passes through the passage where the third switch is located or the passage where the radiator is located, thereby realizing flexible control of the heat dissipation method.

[0036] In some embodiments of the first aspect of the present application, the refrigerant unit includes a plurality of the compressors, and the plurality of the compressors are connected in parallel.

[0037] In the above technical solution, multiple compressors are connected in parallel, which is beneficial to improving the overall power of the compressor. A high-power compressor can be formed by connecting multiple low-power compressors in parallel, which is convenient for the transportation of the compressor and the assembly of the energy storage system.

[0038] In a second aspect, an embodiment of the present application provides an energy storage system, which includes an energy storage device and a refrigerant unit provided by any of the above embodiments; the energy storage device includes a liquid circuit unit and a battery cell, the liquid circuit unit is used to adjust the temperature of the battery cell, and the liquid circuit unit includes a heat exchanger; the input port and the output port are both connected to the heat exchanger.

[0039] In the above technical scheme, the refrigerant unit provided in the first aspect embodiment has an output port and an input port connected to the heat exchanger, so the energy storage device and the refrigerant unit can be produced and transported separately, and the heat exchanger of the refrigerant unit and the energy storage device can be assembled after arriving at the destination. It is possible to split the complex energy storage system into multiple parts and transport them to the destination for assembly, thereby reducing the difficulty of transportation and assembly.

[0040] In some embodiments of the second aspect of the present application, the liquid circuit unit also includes a thermal management component, which is used to adjust the temperature of the battery cell. The thermal management component has a liquid outlet and a liquid inlet, and the liquid outlet is used to provide heat exchange medium into the heat exchanger, and the liquid inlet is used to supply the heat exchange medium in the heat exchanger to enter the thermal management component.

[0041] In the above technical solution, the liquid outlet of the thermal management component is used to provide heat exchange medium into the heat exchanger, and the liquid inlet of the thermal management component is used to supply the heat exchange medium in the heat exchanger to enter the thermal management component. The heat exchange medium can take away the heat of the battery cell. The heat exchange medium carrying the heat of the battery cell can exchange heat with the refrigerant provided to the heat exchanger by the refrigerant unit in the heat exchanger, thereby realizing temperature regulation of the battery cell, facilitating temperature regulation of the battery cell, and helping to improve the reliability of the energy storage system.

[0042] In some embodiments of the second aspect of the present application, the energy storage device further includes a supply tank, and the supply tank is used to replenish heat exchange medium to the liquid circuit unit.

[0043] In the above technical solution, the supply tank is used to replenish the heat exchange medium to the liquid circuit unit, so that the supply tank can replenish the heat exchange medium in the liquid circuit in the liquid circuit unit in time after the amount of heat exchange medium in the liquid circuit is lost, so as to alleviate the problem of reduced heat exchange capacity due to the reduction in the amount of heat exchange medium in the liquid circuit.

[0044] In some embodiments of the second aspect of the present application, the energy storage device also includes a thermal expansion valve, which is used to open or close according to the temperature of the heat exchange medium in the heat exchanger to connect the output port and the heat exchanger or disconnect the output port and the heat exchanger.

[0045] In the above technical solution, the thermal expansion valve is used to open or close according to the temperature of the heat exchange medium in the heat exchanger to connect the output port and the heat exchanger or disconnect the output port and the heat exchanger, so as to make the temperature regulation of the energy storage system more convenient and intelligent.

[0046] In some embodiments of the second aspect of the present application, the liquid circuit unit further includes a pumping device, and the pumping device is used to provide power for the heat exchange medium to circulate in the liquid circuit unit.

[0047] In the above technical solution, the pumping device is used to provide power for the circulation of the heat exchange medium in the liquid circuit unit, which is beneficial for the heat exchange medium to always maintain a flowing state in the liquid circuit unit, thereby improving the heat exchange capacity with the battery cell.

[0048] In some embodiments of the second aspect of the present application, the liquid circuit unit further includes a heater, and the heater is used to heat the heat exchange medium in the liquid circuit unit.

[0049] In the above technical solution, the heater is used to heat the heat exchange medium in the liquid circuit unit. The heat exchange medium can bring the heat generated by the heater to the battery cell to increase the temperature of the battery cell, which is beneficial to the normal operation of the energy storage device in a low temperature environment.

[0050] In some embodiments of the second aspect of the present application, the energy storage device further includes a box, the battery cells are located inside the box, and the refrigerant unit is located outside the box.

[0051] In the above technical solution, the refrigerant unit is arranged outside the box of the energy storage device, which can make more space inside the box of the energy storage device for accommodating battery cells, which is beneficial to improve the energy density of the battery cells.

[0052] In some embodiments of the second aspect, the input port is detachably connected to the heat exchanger; and / or the output port is detachably connected to the heat exchanger.

[0053] In the above technical solution, the input port is detachably connected to the heat exchanger, and / or the output port is detachably connected to the heat exchanger, which facilitates the assembly or disassembly of the refrigerant unit and the heat exchanger, and also facilitates the maintenance and replacement of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 A schematic diagram of an energy storage system provided in some embodiments of the present application;

[0056] Figure 2 for Figure 1 Schematic diagram of the energy storage device in;

[0057] Figure 3 for Figure 1 Schematic diagram of the refrigerant unit.

[0058] Icons: 100-energy storage system; 10-energy storage device; 11-box; 12-battery monomer; 13-liquid circuit unit; 131-heat exchanger; 1311-first pair of interfaces; 1312-second pair of interfaces; 1313-third pair of interfaces; 1314-fourth pair of interfaces; 132-first connecting pipe; 133-heater; 134-second connecting pipe; 135-pumping device; 136-third connecting pipe; 137-fourth connecting pipe; 138-supply box; 139-fifth connecting pipe; 140-thermal expansion valve; 20-refrigeration unit; 20a-output port; 20b-input port; 21-compressor; 211-output end of compressor; 212-input end of compressor; 22-condenser; 221-output end of condenser; 222-input end of condenser; 23-input pipe; 24-fifth A switch component; 25-output tube; 26-second switch component; 27-convergence device; 271-convergence device; 271a-first converger; 271b-second converger; 2711-convergence inlet; 2711a-first convergence inlet; 2711b-second convergence inlet; 2712-convergence outlet; 2712a-first convergence outlet; 2712b-second convergence outlet; 28-diversion device; 281-diversion device; 281a-first diversion device; 281b-second diversion device; 2811-diversion inlet; 2811a-first diversion inlet; 2811b-second diversion inlet; 2812-diversion outlet; 2812a-first diversion outlet; 2812b-second diversion outlet; 29-first pipeline; 210-third switch component; 220-second pipeline; 230-radiator. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0061] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0062] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0063] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0064] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0065] Power batteries are generally formed by connecting multiple battery cells in series, parallel or hybrid to form a high-power battery. With the vigorous development of power batteries in the automotive industry, the energy storage requirements for power batteries are getting higher and higher, which requires power batteries to have more battery cells. The more battery cells there are, the more difficult it is to manage heat.

[0066] Therefore, an energy storage system has emerged, which includes at least one energy storage device and a refrigerant unit. The energy storage device includes a liquid circuit unit and a battery cell. The liquid circuit unit is used to adjust the temperature of the battery cell. The refrigerant unit is used to exchange heat with the liquid circuit unit, thereby taking away the heat of the battery cell taken away by the liquid circuit component, thereby reducing the temperature of the battery cell and achieving temperature management of the battery cell. However, the refrigerant unit and the liquid circuit unit in the related art are an integrated structure, which makes the energy storage system more complicated and inconvenient to transport and assemble.

[0067] Based on the above considerations, in order to improve the problem of difficulty in assembly caused by the complexity of the energy storage system, the present application provides a refrigerant unit, which is arranged outside the energy storage device; the refrigerant unit is used to provide refrigerant to the heat exchanger of the energy storage device, and the refrigerant unit includes: a condenser and a compressor, and the compressor is connected to the condenser; wherein the refrigerant unit has an output port and an input port for connecting to the heat exchanger, the input port is used to supply the refrigerant in the heat exchanger to enter the compressor, and the output port is used to supply the refrigerant in the condenser to enter the heat exchanger.

[0068] The refrigerant unit has an output port and an input port connected to the heat exchanger, so the energy storage device and the refrigerant unit can be produced and transported separately. After arriving at the destination, the refrigerant unit and the heat exchanger of the energy storage device can be assembled. It is possible to split the complex energy storage system into multiple parts and transport them to the destination for assembly, thereby reducing the difficulty of transportation and assembly.

[0069] The refrigerant unit is arranged outside the energy storage device, so that more space inside the box of the energy storage device can be used to accommodate battery cells, which is beneficial to improving the energy density of the battery cells.

[0070] like Figure 1 , Figure 2 As shown, an embodiment of the present application provides an energy storage system, which includes an energy storage device 10, which can store electrical energy. The energy storage device 10 includes a box 11 and a battery cell 12, and the battery cell 12 is accommodated in the box 11.

[0071] The energy storage device 10 may be an energy storage cabinet or an energy storage container. The box 11 of the energy storage device 10 may also be referred to as a prefabricated cabin, a battery cabin, a container, etc. The box 11 may contain a plurality of battery cells 12, and the plurality of battery cells 12 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 12 are connected in series and in parallel. The box 11 may also contain a battery module formed by a plurality of battery cells 12, and the plurality of battery modules may be connected in series, in parallel, or in mixed connection. The box 11 may also contain a plurality of battery packs composed of battery cells 12. The box 11 may include a plurality of rows of battery modules, and a row of battery modules may be referred to as a battery cluster, and each battery module includes a plurality of battery cells connected in series, in parallel, or in mixed connection. It is understandable that a plurality of battery clusters may be provided in the box 11. The box 11 may also include one or more battery cabinets, and each battery cabinet includes a cabinet and a battery cluster.

[0072] The energy storage device 10 also includes a fluid circuit assembly 13. The fluid circuit assembly 13 is disposed in the housing 11 of the energy storage device 10, and is used to adjust the temperature of the battery cells 12, such as lowering the temperature of the battery cells 12, and reducing the risk of explosion or fire of the energy storage device 10, so that the energy storage device 10 can supply energy normally and improve the reliability of the energy storage system.

[0073] The liquid circuit unit 13 includes a heat exchanger 131, and the heat exchanger 131 has a first docking port 1311 and a second docking port 1312. The first docking port 1311 and the second docking port 1312 are connected through a first channel (not shown in the figure) inside the heat exchanger 131. The first docking port 1311 and the second docking port 1312 are both used to connect with the refrigerant unit 20, so that the refrigerant unit 20 and the first channel form a refrigerant circuit. Among them, the first docking port 1311 is used to connect with the output port 20a of the refrigerant unit 20, so that the refrigerant discharged from the output port 20a of the refrigerant unit 20 enters the heat exchanger 131 from the first docking port 1311, and the second docking port 1312 is used to connect with the input port 20b of the refrigerant unit 20, so that the refrigerant in the heat exchanger 131 is discharged from the second docking port 1312 and enters the refrigerant unit 20 from the input port 20b of the refrigerant unit 20. When the refrigerant flows from the first docking port 1311 to the second docking port 1312, the refrigerant and the heat exchange medium in the liquid circuit unit 13 complete heat exchange, and the refrigerant takes away the heat of the heat exchange medium in the liquid circuit unit 13. The heat of the heat exchange medium in the liquid circuit unit 13 comes from the battery cell 12, so that the refrigerant unit 20 and the liquid circuit unit 13 jointly complete the temperature management of the battery cell 12, thereby reducing the temperature of the battery cell 12.

[0074] The heat exchanger 131 also includes a third docking port 1313 and a fourth docking port 1314. The third docking port 1313 and the fourth docking port 1314 are connected to each other through a second channel (not shown in the figure) inside the heat exchanger 131. The first channel and the second channel are independent of each other. The first channel is used for the refrigerant flowing through the refrigerant unit 20, and the second channel is used for the heat exchange medium flowing through the liquid circuit unit 13. When the refrigerant of the refrigerant unit 20 flows through the first channel, it exchanges heat with the heat exchange medium of the liquid circuit unit 13 flowing through the second channel, thereby taking away the heat of the heat exchange medium.

[0075] In some embodiments, the liquid circuit unit 13 further includes a thermal management component (not shown in the figure), which is used for heat exchange with the battery cell 12. The thermal management component has a liquid inlet and a liquid outlet. The liquid inlet is used to connect with the third docking port 1313 so that the heat exchange medium enters the thermal management component, and the liquid outlet is used to connect with the fourth docking port 1314 so that the heat exchange medium in the thermal management component enters the second channel from the fourth docking port 1314. The second channel and the thermal management component form a part of the liquid circuit. When the heat exchange medium flows through the thermal management component, the heat exchange medium in the thermal management component exchanges heat with the battery cell 12, which can take away the heat generated by the battery cell 12. The heat exchange medium carrying the heat of the battery cell 12 is then discharged from the liquid outlet to the second channel. In the second channel, it can exchange heat with the refrigerant in the first channel, thereby taking away the heat of the heat exchange medium. The low-temperature heat exchange medium after the heat is taken away is discharged from the third docking port 1313 and returns to the thermal management component to continue heat exchange with the battery cell 12.

[0076] The heat exchange medium in the liquid circuit unit 13 can be liquid, such as water. Of course, the heat exchange medium in the liquid circuit unit 13 can also be gas, such as air.

[0077] The liquid outlet and the fourth docking port 1314 can be connected through the first connecting tube 132. One end of the first connecting tube 132 is connected to the liquid outlet. The first connecting tube 132 and the liquid outlet can be detachably connected, which is convenient for installation, maintenance and replacement of parts. The first connecting tube 132 and the liquid outlet can be fixedly connected, which is beneficial to improve the stability of the connection between the first connecting tube 132 and the liquid outlet. The other end of the first connecting tube 132 is connected to the fourth docking port 1314. The first connecting tube 132 and the fourth docking port 1314 can be detachably connected, which is convenient for installation, maintenance and replacement of parts. The first connecting tube 132 and the fourth docking port 1314 can be fixedly connected, which is beneficial to improve the stability of the connection between the first connecting tube 132 and the fourth docking port 1314.

[0078] In some embodiments, the liquid circuit unit 13 can not only reduce the temperature of the battery cell 12, but also increase the temperature of the battery cell 12. When the liquid circuit unit 13 is required to increase the temperature of the battery cell 12, the refrigerant unit 20 can be stopped and the refrigerant cannot reach the first channel.

[0079] like Figure 1 , Figure 2 As shown, the liquid circuit unit 13 also includes a heater 133, which is used to heat the heat exchange medium in the liquid circuit. When the heat exchange medium carrying the heat provided by the heater 133 flows through the thermal management component, the heat exchange medium and the battery cell 12 exchange heat to transfer the heat of the heat exchange medium to the battery cell 12 to increase the temperature of the battery cell 12. The heat exchange medium that transfers the heat to the battery cell 12 enters the second channel from the liquid outlet through the first connecting pipe 132, and then returns to the thermal management component.

[0080] The heater 133 is disposed between the fourth docking port 1314 and the liquid inlet, and the heat exchange medium is heated by the heater 133 in the process of flowing from the fourth docking port 1314 to the liquid inlet. The heater 133 and the liquid inlet are connected through the second connecting pipe 134. One end of the second connecting pipe 134 and the heater 133 may be detachably connected to facilitate installation, maintenance and replacement of parts. One end of the second connecting pipe 134 and the heater 133 may be fixedly connected to improve the stability of the connection. The other end of the second connecting pipe 134 and the liquid inlet may be detachably connected to facilitate installation, maintenance and replacement of parts. The other end of the second connecting pipe 134 and the liquid inlet may be fixedly connected to improve the stability of the connection.

[0081] like Figure 1 , Figure 2As shown, in some embodiments, the liquid circuit unit 13 further includes a pumping device 135, which is used to provide power for the heat exchange medium to circulate in the liquid circuit. The pumping device 135 can be arranged between the fourth docking port 1314 and the liquid inlet.

[0082] In the embodiment where the liquid circuit unit 13 includes a heater 133, the pumping device 135 is arranged between the third docking port 1313 and the heater 133, the pumping device 135 is connected to the third docking port 1313 through the third connecting pipe 136, and the pumping device 135 is connected to the heater 133 through the fourth connecting pipe 137. The third connecting pipe 136 and the pumping device 135 can be detachably connected or fixedly connected. The third connecting pipe 136 and the fourth docking port 1314 can be detachably connected or fixedly connected. The pumping device 135 and the fourth connecting pipe 137 can be detachably connected or fixedly connected. The fourth connecting pipe 137 and the heater 133 can be detachably connected or fixedly connected.

[0083] The pumping device 135 may be a water pump, a motor, or the like.

[0084] like Figure 1 , Figure 2 As shown, in some embodiments, the liquid circuit unit 13 further includes a supply tank 138, which is connected to the third connecting tube 136 through a fifth connecting tube 139, and the connection position of the fifth connecting tube 139 and the third connecting tube 136 is located between the fourth docking port 1314 and the pumping device 135. The supply tank 138 is used to replenish the heat exchange medium in the liquid circuit in time after the amount of heat exchange medium in the liquid circuit is lost, so as to alleviate the problem of reduced heat exchange capacity due to the reduction of the amount of heat exchange medium in the liquid circuit.

[0085] like Figure 1 , Figure 2 As shown, in some embodiments, the energy storage system may include multiple energy storage devices 10, and the first and second ports 1311 and 1312 of the heat exchanger 131 of the liquid circuit unit 13 of each energy storage device 10 are connected to the output port 20a and the input port 20b of the refrigerant unit 20, so that heat exchange can be performed with multiple heat exchangers 131 through one refrigerant unit 20, reducing the number of refrigerant units 20 of the energy storage system, simplifying the structure of the energy storage system, reducing the weight of the energy storage system, and reducing the cost. One refrigerant unit 20 can exchange heat with the heat exchangers 131 of multiple energy storage devices 10, simplifying the cooling transfer path scheme, reducing heat transfer losses, and improving heat exchange efficiency.

[0086] like Figure 1 , Figure 2As shown, in some embodiments, the liquid circuit unit 13 further includes a thermal expansion valve 140, which is disposed between the output end of the refrigerant unit 20 and the first docking port 1311. The thermal expansion valve 140 is used to open or close according to the temperature of the heat exchange medium in the heat exchanger 131, so as to connect or disconnect the output port 20a of the refrigerant unit 20 and the first docking port 1311. When the temperature of the heat exchange medium in the heat exchanger 131 reaches a preset value, the thermal expansion valve 140 opens, and the refrigerant in the refrigerant unit 20 can enter the first channel of the heat exchanger 131 and the heat exchange medium in the second channel of the heat exchanger 131 from the output port 20a of the refrigerant unit 20 and the first docking port 1311 for heat exchange, so that the temperature regulation of the energy storage system is more convenient and intelligent.

[0087] like Figure 1 , Figure 3 As shown, an embodiment of the present application provides a refrigerant unit 20, which is arranged outside the energy storage device 10; the refrigerant unit 20 is used to provide refrigerant to the heat exchanger 131 of the energy storage device 10, and the refrigerant unit 20 includes: a condenser 22 and a compressor 21, and the compressor 21 is connected to the condenser 22; wherein the refrigerant unit 20 has an output port 20a and an input port 20b for connecting to the heat exchanger 131, the input port 20b is used to supply the refrigerant in the heat exchanger 131 to enter the compressor 21, and the output port 20a is used to supply the refrigerant in the condenser 22 to enter the heat exchanger 131.

[0088] The types of refrigerants in the refrigerant unit 20 include, but are not limited to, Freon, alkane, ammonia, and carbon dioxide. The compressor 21 can compress and drive the refrigerant in the refrigerant circuit. The compressor 21 can convert high-temperature and low-pressure refrigerants into high-temperature and high-pressure refrigerants.

[0089] The condenser 22 is used to release the heat of the high-temperature and high-pressure refrigerant from the compressor 21 and discharge the low-temperature and low-pressure refrigerant.

[0090] The specific working principle of the refrigerant unit 20 is as follows: the refrigerant in the first channel forms a high-temperature and low-pressure gaseous refrigerant after heat exchange with the heat exchange medium in the second channel of the heat exchanger 131. The high-temperature and low-pressure refrigerant is discharged from the heat exchanger 131 from the second docking port 1312 of the heat exchanger 131, and enters the compressor 21 from the input port 20b of the refrigerant unit 20. The compressor 21 drives the gaseous, high-temperature and low-pressure refrigerant to form a high-temperature and high-pressure liquid refrigerant or a high-temperature and high-pressure gas-liquid two-phase refrigerant. The compressor 21 then drives the high-temperature and high-pressure refrigerant to the condenser 22, releases heat through the condenser 22, forms a low-temperature and high-pressure liquid refrigerant, and discharges the refrigerant unit 20 from the output port of the refrigerant unit 20, and enters the first channel from the first docking port 1311 of the heat exchanger 131 to continue heat exchange with the heat exchange medium in the second channel.

[0091] The refrigerant unit 20 has an output port 20a and an input port 20b connected to the heat exchanger 131, so the energy storage device 10 and the refrigerant unit 20 can be produced and transported separately, and then assembled with the heat exchanger 131 of the energy storage device 10 after arriving at the destination, so that the complex energy storage system can be split into multiple parts and transported to the destination for assembly, thereby reducing the difficulty of transportation and assembly. The refrigerant unit 20 is arranged outside the energy storage device 10, so that more space inside the box 11 of the energy storage device 10 can be used to accommodate the battery cells 12, which is conducive to improving the energy density of the battery cells 12.

[0092] like Figure 1 , Figure 3 As shown, in some embodiments, the refrigerant unit 20 also includes an input pipe 23, which is connected to the compressor 21, and one end of the input pipe 23 forms an input port 20b. The input pipe 23 is provided with a first switch 24, and the first switch 24 is used to enable the input pipe 23 to connect the compressor 21 and the heat exchanger 131 or cut off the compressor 21 and the heat exchanger 131.

[0093] One end of the input pipe 23 can be directly connected to the compressor 21 to achieve communication between the input pipe 23 and the input end 212 of the compressor. One end of the input pipe 23 can be indirectly connected to the compressor 21 to achieve communication between the input pipe 23 and the input end 212 of the compressor. The other end of the input pipe 23 forms an input port 20b.

[0094] The first switch 24 can be arranged in the middle area of ​​the input pipe 23. The first switch 24 can cut off the internal passage of the input pipe 23, so that when the first switch 24 is closed, the refrigerant cannot flow through the input pipe 23 to the compressor 21 after passing through the input port 20b. When the first switch 24 is opened, the refrigerant can flow through the input pipe 23 to the compressor 21 after passing through the input port 20b. The first switch 24 arranged in the middle area of ​​the input pipe 23 mentioned here is not limited to the first switch 24 being arranged in the middle position in the extending direction of the input pipe 23, and can also be arranged at positions close to both ends of the input pipe 23, such as positions close to the input port 20b.

[0095] The first switch element 24 can also be set at both ends of the input pipe 23, for example, at one end of the input pipe 23 forming the input port 20b, and the first switch element 24 can open or close the input port 20b, thereby connecting the compressor 21 and the heat exchanger 131 or disconnecting the compressor 21 and the heat exchanger 131.

[0096] The first switch element 24 can be a solenoid valve, a stop valve, a manual switch element, etc.

[0097] The refrigerant discharged from the first flow channel of the heat exchanger 131 can flow to the compressor 21 through the input pipe 23 .

[0098] The input pipe 23 is connected to the compressor 21, and one end of the input pipe 23 forms the input port 20b of the refrigerant unit 20. The provision of the input pipe 23 is not only convenient for connection with the heat exchanger 131 of the energy storage device 10, but also can increase the space for accommodating the refrigerant in the refrigerant unit 20. If the refrigerant is injected into the pipeline of the refrigerant unit 20 in advance, the provision of the first switch 24 is conducive to reducing the risk of the refrigerant in the pipeline of the refrigerant unit 20 being discharged from the input port 20b before the refrigerant unit 20 is connected to the heat exchanger 131, and further facilitates the independent production and transportation of the refrigerant unit 20.

[0099] like Figure 1 , Figure 3 As shown, in some embodiments, the refrigerant unit 20 also includes an output pipe 25, which is connected to the condenser 22, and one end of the output pipe 25 forms an output port 20a. The output pipe 25 is provided with a second switch component 26, and the second switch component 26 is used to enable the output pipe 25 to connect the condenser 22 and the heat exchanger 131 or cut off the condenser 22 and the heat exchanger 131.

[0100] One end of the output pipe 25 can be directly connected to the condenser 22 to achieve communication between the output pipe 25 and the output end 221 of the condenser. One end of the output pipe 25 can be indirectly connected to the condenser 22 to achieve communication between the output pipe 25 and the output end 221 of the condenser. The other end of the output pipe 25 forms an output port 20a.

[0101] The second switch 26 can be arranged in the middle area of ​​the output pipe 25. The second switch 26 can cut off the internal passage of the output pipe 25, so that when the second switch 26 is closed, the refrigerant cannot flow through the output pipe 25 to the output port 20a after passing through the output end 221 of the condenser. When the second switch 26 is opened, the refrigerant can flow through the output pipe 25 to the output port 20a and then to the heat exchanger 131 after passing through the output end 221 of the condenser. The second switch 26 arranged in the middle area of ​​the output pipe 25 mentioned here is not limited to the second switch 26 being arranged in the middle position of the extension direction of the output pipe 25, and can also be arranged at positions close to both ends of the output pipe 25, such as positions close to the output port 20a.

[0102] The second switch element 26 can also be set at both ends of the output pipe 25, for example, at one end of the output pipe 25 forming the output port 20a, then the second switch element 26 can open or close the output port 20a, thereby connecting the condenser 22 and the heat exchanger 131 or disconnecting the condenser 22 and the heat exchanger 131.

[0103] The second switch element 26 can be a solenoid valve, a stop valve, a manual switch element, etc.

[0104] The refrigerant discharged from the output end 221 of the condenser can flow to the heat exchanger 131 through the output pipe 25 .

[0105] The output pipe 25 is connected to the condenser 22, and one end of the output pipe 25 forms the output port 20a of the refrigerant unit 20. The arrangement of the output pipe 25 is not only convenient for connection with the heat exchanger 131 of the energy storage device 10, but also can increase the space for accommodating the refrigerant in the refrigerant unit 20. If the refrigerant is injected into the pipeline of the refrigerant unit 20 in advance, the second switch 26 is provided to reduce the risk of the refrigerant in the pipeline of the refrigerant unit 20 being discharged from the output port before the refrigerant unit 20 is connected to the heat exchanger 131, and further facilitate the independent production and transportation of the refrigerant unit 20.

[0106] like Figure 1 , Figure 3 As shown, in some embodiments, the refrigerant unit 20 has multiple input ports 20b and multiple output ports 20a, and the input ports 20b and the output ports 20a correspond one to one. One input port 20b and one output port 20a are used to connect to the heat exchanger 131 of one energy storage device 10.

[0107] It is understandable that a refrigerant unit 20 can be provided with a plurality of energy storage devices 10, and can be connected to the heat exchanger 131 of each energy storage device 10 for heat exchange. The term "plurality" in this application refers to two or more. The number of energy storage devices 10 can be two, three, four, etc. Figure 1 , the energy storage system is shown to have three energy storage devices 10 , and accordingly, the refrigerant unit 20 has three input ports 20 b and three output ports, which are respectively connected to the heat exchangers 131 of the three energy storage devices 10 .

[0108] The refrigerant unit 20 has multiple input ports 20b and multiple output ports 20a, and the input ports 20b and the output ports 20a correspond one to one. One input port 20b and one output port 20a are used to connect to a heat exchanger 131. Then, the refrigerant unit 20 can be connected to the heat exchangers 131 of multiple energy storage devices 10, thereby realizing heat exchange between one refrigerant unit 20 and multiple energy storage devices 10, reducing the number of refrigerant units 20 of the energy storage system, simplifying the structure of the energy storage system, reducing the weight of the energy storage system, and reducing the cost. Through a refrigerant unit 20, heat exchange can be performed with the heat exchangers 131 of multiple energy storage devices 10, simplifying the cooling transfer path scheme, reducing heat transfer losses, and improving heat exchange efficiency.

[0109] like Figure 1 , Figure 3As shown, in some embodiments, the refrigerant unit 20 further includes a confluence device 27, which connects the input end 212 of the compressor and the multiple input ports 20b, and the confluence device 27 is used to converge the refrigerant of the multiple input ports 20b to the input end 212 of the compressor.

[0110] The multiple input ports 20 b are connected to the multiple heat exchangers 131 , and the refrigerant discharged from the first flow channel of each heat exchanger 131 flows through the corresponding input port 20 b and the confluence device 27 connected to the input port 20 b to the compressor 21 .

[0111] By converging the refrigerants from multiple input ports 20b to the input end 212 of the compressor through the converging device 27, the number of interfaces at the input end 212 of the compressor can be reduced, the structure of the compressor 21 can be simplified, and it is also beneficial for the refrigerant to enter the compressor 21 quickly and smoothly, thereby improving the heat exchange efficiency.

[0112] In some embodiments, the refrigerant unit 20 includes a plurality of input pipes 23, each of which is connected to a confluence device 27, and an input port 20b is formed at one end of each input pipe 23. The input pipe 23 is provided with a first switch element 24, and the first switch element 24 is used to enable the input pipe 23 to connect the compressor 21 and the heat exchanger 131 or to disconnect the compressor 21 and the heat exchanger 131.

[0113] One end of the input pipe 23 is connected to the flow converging device 27 , and each input pipe 23 is indirectly connected to the compressor 21 through the flow converging device 27 .

[0114] A first switch element 24 is correspondingly provided for each input tube 23 , and the on and off of each input tube 23 can be independently controlled.

[0115] Each input pipe 23 is connected to the confluence device 27, so that the input pipe 23 and the compressor 21 are connected through the confluence device 27. The arrangement of multiple input pipes 23 is not only convenient for connection with the confluence device 27, but also can increase the space for accommodating the refrigerant in the refrigerant unit 20. If the refrigerant is injected into the pipeline of the refrigerant unit 20 in advance, the first switch 24 is provided to reduce the risk of the refrigerant in the pipeline of the refrigerant unit 20 being discharged from the input port 20b before the refrigerant unit is connected to the heat exchanger 131, and further facilitate the independent production and transportation of the refrigerant unit 20.

[0116] like Figure 1 , Figure 3 As shown, in some embodiments, the concentrator device 27 includes a plurality of concentrators 271, at least two concentrators 271 are connected in series, and among the concentrators 271 connected in series, at least one concentrator 271 is connected to a plurality of input ports 20b.

[0117] The confluence device 271 includes a plurality of confluence inlets 2711 and a confluence outlet 2712, and each confluence inlet 2711 is connected to the confluence outlet 2712. The refrigerant entering the confluence inlet 2711 is gathered at the confluence outlet 2712, and flows from the confluence outlet 2712 to the compressor 21. Each confluence device 271 may include two confluence inlets 2711, three confluence inlets 2711, four confluence inlets 2711, etc. The number of confluence inlets 2711 of each confluence device 271 may be the same or different. Figure 1 2 shows a situation where the flow confluence device 27 includes two flow confluence devices 271 , and each flow confluence device 271 includes two flow confluence inlets 2711 .

[0118] The two flow combiners 271 are connected in series, which means that a flow combiner outlet 2712 of one flow combiner 271 of the two flow combiners 271 is connected to a flow combiner inlet 2711 of the other flow combiner 271 .

[0119] The confluence device 27 includes a plurality of confluence devices 271, and at least two confluence devices 271 are connected in series, so that the refrigerant is gradually merged into the compressor 21, which is beneficial for the refrigerant to enter the compressor 21 quickly and smoothly, thereby improving the heat exchange efficiency.

[0120] like Figure 1 As shown, in some embodiments, multiple concentrators 271 include a first concentrator 271a and a second concentrator 271b, the first concentrator 271a has a plurality of first concentrator inlets 2711a and a first concentrator outlet 2712a, the second concentrator 271b has a plurality of second concentrator inlets 2711b and a second concentrator outlet 2712b, each first concentrator inlet 2711a is connected to at least one input port 20b, the first concentrator outlet 2712a is connected to a second concentrator inlet 2711b, so as to realize the first concentrator 271a and the second concentrator 271b being connected in series, the second concentrator outlet 2712b is connected to the input end 212 of the compressor, and the second concentrator inlet 2711b is connected to at least one input port 20b.

[0121] For example, Figure 1In the embodiment, the confluence device 27 includes two confluence devices 271, and the two confluence devices 271 are respectively a first confluence device 271a and a second confluence device 271b. The first confluence device 271a includes two first confluence inlets 2711a, and the second confluence device 271b includes two second confluence inlets 2711b. The two first confluence inlets 2711a are respectively connected to two input pipes 23. The first confluence outlet 2712a of the first confluence device 271a is connected to a second confluence inlet 2711b of the second confluence device 271b to realize the two confluence devices 271 in series, and the other second confluence inlet 2711b of the second confluence device 271b is connected to an input pipe 23. The second confluence outlet 2712b of the second confluence device 271b is connected to the input end 212 of the compressor. The refrigerant entering from the two input ports 20b converges through the first convergent 271a to a second convergent inlet 2711b of the second convergent 271b. The second convergent 271b converges the refrigerant entering from one input port 20b and the refrigerant converging to the first convergent outlet 2712a to the second convergent outlet 2712b, and flows from the second convergent outlet 2712b to the compressor 21.

[0122] Each first confluence inlet 2711a of the first confluence device 271a is connected to at least one input port 20b, and the first confluence outlet 2712a of the first confluence device 271a is connected to a second confluence inlet 2711b to realize the series connection of the first confluence device 271a and the second confluence device 271b, and the second confluence outlet 2712b is connected to the input end 212 of the compressor, and is gradually merged with the refrigerant into the compressor 21, which is conducive to the refrigerant entering the compressor 21 quickly and smoothly, thereby improving the heat exchange efficiency.

[0123] like Figure 1 As shown, in some embodiments, the refrigerant unit 20 further includes a diverter 28, which connects the output end 221 of the condenser and a plurality of output ports, and is used to divert the refrigerant at the output end 221 of the condenser to the plurality of output ports.

[0124] The plurality of output ports are correspondingly connected to the plurality of heat exchangers 131 , and the refrigerant discharged from the output end 221 of the condenser is distributed to each output port through the flow dividing device 28 .

[0125] The flow dividing device 28 allows the refrigerant at the output end 221 of the condenser to be divided into multiple output ports, which is conducive to the refrigerant entering the compressor 21 quickly and smoothly, thereby improving the heat exchange efficiency. It is also conducive to more evenly distributing the refrigerant to each output port, so that the heat exchange capacity of the refrigerant unit 20 and each energy storage device 10 is basically the same, thereby improving the uniformity of heat exchange.

[0126] In some embodiments, the refrigerant unit 20 includes a plurality of output pipes 25, each of which is connected to the diversion device 28, one end of each of which forms the output port, and the output pipe 25 is provided with a second switch element 26, which is used to enable the output pipe 25 to connect the condenser 22 and the heat exchanger 131 or to disconnect the condenser 22 and the heat exchanger 131.

[0127] One end of the output pipe 25 is connected to the flow dividing device 28 , and each output pipe 25 is indirectly connected to the condenser 22 via the flow dividing device 28 .

[0128] A second switch element 26 is correspondingly provided for each output tube 25 , and the on and off of each output tube 25 can be independently controlled.

[0129] Each output pipe 25 is connected to the flow divider 28, so that the output pipe 25 and the condenser 22 are connected through the flow divider 28. The arrangement of multiple output pipes 25 is not only convenient for connection with the flow divider 28, but also can increase the space for accommodating the refrigerant in the refrigerant unit 20. If the refrigerant is injected into the pipeline of the refrigerant unit 20 in advance, the second switch 26 is provided to reduce the risk of the refrigerant in the pipeline of the refrigerant unit 20 being discharged from the output port 20a before the refrigerant unit 20 is connected to the heat exchanger 131, and further facilitates the independent production and transportation of the refrigerant unit 20.

[0130] In some embodiments, the flow splitting device 28 includes a plurality of flow splitters 281 , at least two flow splitters 281 are connected in series, and among the flow splitters 281 connected in series, at least one flow splitter 281 is connected to a plurality of output ports 20 a .

[0131] The flow divider 281 includes a plurality of flow diversion outlets 2812 and a flow diversion inlet 2811, and each converging outlet 2712 is connected to the converging inlet 2711. The refrigerant discharged from the output end 221 of the condenser enters the flow diversion inlet 2811 and then flows to each flow diversion outlet 2812, thereby being distributed to each output pipe 25. Each flow divider 281 may include two flow diversion outlets 2812, three flow diversion outlets 2812, four flow diversion outlets 2812, etc. The number of flow diversion outlets 2812 of each flow divider 281 may be the same or different. Figure 1 , the flow dividing device 28 includes two flow dividers 281 , and each flow divider 281 includes two flow dividing outlets 2812 .

[0132] The two flow splitters 281 are connected in series, which means that the flow splitting outlet 2812 of one flow splitter 281 of the two flow splitters 281 is connected to the flow splitting inlet 2811 of the other flow splitter 281 .

[0133] The diverter device 28 includes a plurality of diverters 281, at least two of which are connected in series, so that the refrigerant is diverted to the output port 20a step by step, which is beneficial to the rapid and smooth distribution of the refrigerant, improves the heat exchange efficiency, and facilitates a more uniform distribution of the refrigerant.

[0134] like Figure 1 As shown, in some embodiments, multiple diverters 281 include a first diverter 281a and a second diverter 281b, the first diverter 281a has a plurality of first diverter outlets 2812a and a first diverter inlet 2811a, the second diverter 281b has a plurality of second diverter outlets 2812b and a second diverter inlet 2811b, each first diverter outlet 2812a is connected to at least one output port 20a, the first diverter inlet 2811a is connected to a second diverter outlet 2812b to realize the first diverter 281a and the second diverter 281b are connected in series, the second diverter inlet 2811b is connected to the output end 221 of the condenser, and the second diverter outlet 2812b is connected to at least one output port 20a.

[0135] For example, Figure 1 In the embodiment, the flow dividing device 28 includes two flow dividers 281, the two flow dividers 281 are respectively a first flow divider 281a and a second flow divider 281b, the first flow divider 281a includes two first flow divider outlets 2812a, and the second flow divider 281b includes two second flow divider outlets 2812b. The two first flow divider outlets 2812a are respectively connected to two output pipes 25. The first flow divider inlet 2811a of the first flow divider 281a is connected to a second flow divider outlet 2812b of the second flow divider 281b to realize the two flow dividers 281 in series, and the other second flow divider outlet 2812b of the second flow divider 281b is connected to an output pipe 25. The second flow divider inlet 2811b of the second flow divider 281b is communicated with the output end 221 of the condenser. The refrigerant discharged from the output end 221 of the condenser enters the second branch inlet 2811b and is distributed to each second branch outlet 2812b of the second branch outlet 281b through the second branch device 281b. The refrigerant discharged from one second branch outlet 2812b is distributed to two output pipes 25 through the first branch device 281a, and the refrigerant discharged from another second branch outlet 2812b enters one output pipe 25.

[0136] Each first diverter outlet 2812a of the first diverter 281a is connected to at least one output port 20a, and the first diverter inlet 2811a of the first diverter 281a is connected to a second diverter outlet 2812b of the second diverter 281b, so as to realize the series connection of the first diverter 281a and the second diverter 281b, which is convenient for the step-by-step diversion of the refrigerant to the output port, and is beneficial to the rapid and smooth distribution of the refrigerant, improving the heat exchange efficiency, and facilitating more uniform distribution of the refrigerant.

[0137] like Figure 1 As shown, in some embodiments, the output end 211 of the compressor and the input end 222 of the condenser are connected through a first pipe 29, and the first pipe 29 is provided with a third switch element 210, and the third switch element 210 is used to enable the first pipe 29 to connect the output end 211 of the compressor and the input end 222 of the condenser or to cut off the output end 211 of the compressor and the input end 222 of the condenser.

[0138] The third switch 210 is disposed in the middle area of ​​the first pipe 29. The third switch 210 can cut off the internal passage of the first pipe 29, so that when the third switch 210 is closed, the refrigerant cannot flow from the output end 211 of the compressor to the input end 222 of the condenser. When the third switch 210 is opened, the refrigerant can flow from the output end 211 of the compressor to the input end 222 of the condenser.

[0139] The third switch element 210 can be a solenoid valve, a stop valve, a manual switch element, etc.

[0140] The output end 211 of the compressor and the input end 222 of the condenser are connected through the first pipe 29, which facilitates the communication between the output end 211 of the compressor and the input end 222 of the condenser. The first pipe 29 can also accommodate refrigerant, so that more refrigerant can be accommodated in the refrigerant unit 20, which is conducive to improving the heat exchange capacity. The third switch 210 is arranged to facilitate the control of the on-off between the output end 211 of the compressor and the input end 222 of the condenser, thereby facilitating the control of the working state of the refrigerant unit 20.

[0141] In some embodiments, the output end 211 of the compressor and the input end 222 of the condenser are connected through a second pipe 220 , and the second pipe 220 is provided with a radiator 230 .

[0142] The refrigerant discharged from the output end 211 of the compressor reaches the input end 222 of the condenser through the second pipe 220 and the radiator 230. When the refrigerant passes through the radiator 230, the radiator 230 can release the heat of the refrigerant, so that the temperature of the refrigerant entering the condenser 22 is lower, and the heat dissipation burden of the condenser 22 is smaller.

[0143] The second pipe 220 is provided with a radiator 230, which can release the heat of the refrigerant from the compressor 21, which is conducive to the rapid heat dissipation of the refrigerant, improves the heat dissipation efficiency, reduces the power consumption of the condenser 22, and thus improves the heat exchange capacity. And through the two-stage heat dissipation of the radiator 230 and the condenser 22, the temperature of the refrigerant entering the heat exchanger 131 is lower, and the heat exchange capacity is better.

[0144] In some embodiments, the heat sink 230 is configured to be buried underground.

[0145] The ambient temperature underground is lower, which is more conducive to the heat dissipation of the radiator 230 .

[0146] The radiator 230 is used to be buried underground, which can further improve the heat dissipation efficiency of the refrigerant when passing through the heat exchanger 131, and is also beneficial to reducing the load of the condenser 22, thereby reducing the demand for air-cooled ventilation volume, and can reduce the number of fans and the speed of the fans, thereby reducing the unit noise and working energy consumption.

[0147] Of course, in other embodiments, the radiator 230 may also be disposed on the ground.

[0148] In some embodiments, the output end 211 of the compressor and the input end 222 of the condenser are connected through a first pipe 29, and the first pipe 29 is provided with a third switch element 210, and the third switch element 210 is used to realize that the first pipe 29 connects the output end 211 of the compressor and the input end 222 of the condenser or disconnects the output end 211 of the compressor and the input end 222 of the condenser; the third switch element 210 and the radiator 230 are connected in parallel.

[0149] The third switch element 210 is connected in parallel with the radiator 230. When the third switch element 210 is turned on, a portion of the refrigerant discharged from the output end 211 of the compressor can enter the condenser 22 from the first pipe 29, and another portion of the refrigerant discharged from the output end 211 of the compressor can enter the condenser 22 after dissipating the heat through the radiator 230.

[0150] Of course, when the third switch 210 is turned on, the refrigerant discharged from the output end 211 of the compressor can also enter the condenser 22 after the heat is dissipated by the radiator 230 or enter the condenser 22 through the first pipe 29 .

[0151] When the third switch 210 is closed, all the refrigerant discharged from the output end 211 of the compressor enters the condenser 22 after the heat is dissipated by the radiator 230 .

[0152] Therefore, the third switch 210 and the radiator 230 are connected in parallel, and the refrigerant can pass through the passage where the radiator 230 is located and the passage where the third switch is located at the same time, or the refrigerant only passes through the passage where the third switch is located or the passage where the radiator 230 is located, thereby realizing flexible control of the heat dissipation method.

[0153] The number of compressors 21 may be one or more. In some embodiments, the refrigerant unit 20 includes a plurality of compressors 21, and the plurality of compressors 21 are connected in parallel.

[0154] Connecting a plurality of compressors 21 in parallel is beneficial to improving the overall power of the compressor 21. A high-power compressor 21 can be formed by connecting a plurality of low-power compressors 21 in parallel, which facilitates the transportation of the compressor 21 and the assembly of the energy storage system.

[0155] An embodiment of the present application also provides an energy storage system, which includes an energy storage device 10 and a refrigerant unit 20 provided in any of the above embodiments; the energy storage device 10 includes a liquid circuit unit 13 and a battery cell 12, the liquid circuit unit 13 is used to adjust the temperature of the battery cell 12, and the liquid circuit unit 13 includes a heat exchanger 131; the input port 20b and the output port 20a are both connected to the heat exchanger 131.

[0156] The number of the energy storage device 10 may be one or more. Figure 1 2 shows a case where there are three energy storage devices 10 .

[0157] The refrigerant unit 20 provided in any of the above embodiments has an output port 20a and an input port 20b connected to the heat exchanger 131, so the energy storage device 10 and the refrigerant unit 20 can be produced and transported separately, and then the refrigerant unit 20 and the heat exchanger 131 of the energy storage device 10 are assembled after arriving at the destination. It is possible to split the complex energy storage system into multiple parts and transport them to the destination for assembly, thereby reducing the difficulty of transportation and assembly.

[0158] In some embodiments, the liquid circuit unit 13 also includes a thermal management component, which is used to adjust the temperature of the battery cell. The thermal management component has a liquid outlet and a liquid inlet. The liquid outlet is used to provide heat exchange medium to the heat exchanger, and the liquid inlet is used to supply the heat exchange medium in the heat exchanger to enter the thermal management component.

[0159] The liquid outlet of the heat management component is an end of the internal channel of the heat management component for the heat exchange medium to be discharged. The liquid inlet of the heat management component is an end of the internal channel of the heat management component for the heat exchange medium to be entered.

[0160] Thermal management components can also be called water cooling plates, liquid cooling plates, heat exchange plates, temperature regulating plates, etc. The heat exchange medium can be water, air, a mixture of water and ethylene glycol, a refrigerant, a phase change material, etc.

[0161] The liquid outlet of the thermal management component is used to provide heat exchange medium to the heat exchanger 131, and the liquid inlet of the thermal management component is used to supply the heat exchange medium in the heat exchanger 131 to enter the thermal management component. The heat exchange medium can take away the heat of the battery cell. The heat exchange medium carrying the heat of the battery cell can exchange heat with the refrigerant provided to the heat exchanger 131 by the refrigerant unit in the heat exchanger 131, thereby realizing temperature regulation of the battery cell, facilitating the temperature regulation of the battery cell, and helping to improve the reliability of the energy storage system.

[0162] In some embodiments, the energy storage device 10 further includes a supply tank 138 , and the supply tank 138 is used to replenish heat exchange medium to the liquid circuit unit 13 .

[0163] The supply tank 138 is used to replenish the heat exchange medium to the liquid circuit unit, so that the supply tank 138 can replenish the heat exchange medium in the liquid circuit within the liquid circuit unit 13 in time after the amount of heat exchange medium in the liquid circuit is lost, so as to alleviate the problem of reduced heat exchange capacity due to the reduction in the amount of heat exchange medium in the liquid circuit.

[0164] In some embodiments, the energy storage device 10 further includes a thermal expansion valve 140 , which is used to open or close according to the temperature of the heat exchange medium in the heat exchanger 131 to connect the output port 20a and the heat exchanger 131 or disconnect the output port 20a and the heat exchanger 131 .

[0165] When the temperature of the heat exchange medium in the heat exchanger 131 reaches a preset value, the thermal expansion valve 140 opens, and the thermal expansion valve 140 connects the output port 20a and the heat exchanger 131, and the refrigerant discharged from the output port 20a of the refrigerant unit 20 can enter the first channel of the heat exchanger 131.

[0166] When the temperature of the heat exchange medium in the heat exchanger 131 does not reach the preset value, the thermal expansion valve 140 is closed, and the thermal expansion valve 140 disconnects the passage between the output port 20a and the heat exchanger 131, and the refrigerant discharged from the output port 20a of the refrigerant unit 20 cannot enter the first channel of the heat exchanger 131.

[0167] The thermal expansion valve 140 is used to open or close according to the temperature of the heat exchange medium in the heat exchanger 131 to connect the output port 20a and the heat exchanger 131 or disconnect the output port 20a and the heat exchanger 131, so as to make the temperature regulation of the energy storage system 100 more convenient and intelligent.

[0168] In some embodiments, the liquid circuit unit 13 further includes a pumping device 135 , and the pumping device 135 is used to provide power for the heat exchange medium to circulate in the liquid circuit unit 13 .

[0169] The pumping device 135 actually provides power for the heat exchange medium to circulate in the liquid loop formed inside the liquid circuit unit 13 .

[0170] The pumping device 135 is used to provide power for the heat exchange medium to circulate in the liquid circuit unit 13, which is beneficial for the heat exchange medium to always maintain a flowing state in the liquid circuit unit 13, thereby improving the heat exchange capacity with the battery cells.

[0171] In some embodiments, the fluid circuit unit 13 further includes a heater 133 , and the heater 133 is used to heat the heat exchange medium in the fluid circuit unit 13 .

[0172] The heater 133 is used to heat the heat exchange medium in the liquid circuit unit 13. When the heat exchange medium flows through the thermal management component, the heat exchange medium can bring the heat generated by the heater 133 to the battery cell to increase the temperature of the battery cell, which is beneficial to the normal operation of the energy storage device 10 in a low temperature environment.

[0173] In some embodiments, the energy storage device 10 further includes a box body 11 , the battery cells 12 are located inside the box body 11 , and the refrigerant unit 20 is located outside the box body 11 .

[0174] The refrigerant unit 20 is disposed outside the box body 11 of the energy storage device 10 , so that more space inside the box body 11 of the energy storage device 10 can be used to accommodate the battery cells 12 , which is beneficial to improving the energy density of the battery cells 12 .

[0175] In some embodiments, the input port 20 b is detachably connected to the heat exchanger 131 ; and / or, the output port 20 a is detachably connected to the heat exchanger 131 .

[0176] The input port 20b and the heat exchanger 131 may be detachably connected, and the output port 20a and the heat exchanger 131 may be fixedly connected. The input port 20b and the heat exchanger 131 may be fixedly connected, and the output port 20a and the heat exchanger 131 may be detachably connected. The output port 20a and the heat exchanger 131 may be fixedly connected, and the input port 20b and the heat exchanger 131 may also be fixedly connected.

[0177] The input port 20b is detachably connected to the heat exchanger 131, and / or the output port 20a is detachably connected to the heat exchanger 131, which facilitates the assembly or disassembly of the refrigerant unit 20 and the heat exchanger 131, and also facilitates the maintenance and replacement of the energy storage system.

[0178] The embodiment of the present application provides an energy storage system, the energy storage system 100 includes a refrigerant unit 20 and three energy storage devices 10; the refrigerant unit 20 includes an input pipe 23, a first confluence 271a, a second confluence 271b, a compressor 21, a condenser 22, a first flow divider 281a, and a second flow divider 281b; the first confluence 271a includes two first confluence inlets 2711a and a first confluence outlet 2712a, and the second confluence 271b includes two second confluence inlets 2711b and a second confluence outlet 2712b. The two first confluence inlets 2711a are respectively connected to the two input pipes 23. The first confluence outlet 2712a of the first confluence 271a is connected to a second confluence inlet 2711b of the second confluence 271b to realize the series connection of the two confluences 271, and the other second confluence inlet 2711b of the second confluence 271b is connected to an input pipe 23. The second confluence outlet 2712b of the second confluence device 271b is communicated with the input end 212 of the compressor. The refrigerant entering from the two input ports 20b is confluenced to a second confluence inlet 2711b of the second confluence device 271b through the first confluence device 271a. The second confluence device 271b confluences the refrigerant entering from one input port 20b and the refrigerant confluenced to the first confluence outlet 2712a to the second confluence outlet 2712b, and flows from the second confluence outlet 2712b to the compressor 21. The first flow splitter 281a has two first flow splitting outlets 2812a and one first flow splitting inlet 2811a, and the second flow splitter 281b has two second flow splitting outlets 2812b and one second flow splitting inlet 2811b, and the two first flow splitting outlets 2812a are respectively connected to the two output pipes 25. The first shunt inlet 2811a of the first shunt 281a is connected to a second shunt outlet 2812b of the second shunt 281b to realize the two shunts 281 in series, and the other second shunt outlet 2812b of the second shunt 281b is connected to an output pipe 25. The second shunt inlet 2811b of the second shunt 281b is connected to the output end 221 of the condenser. A first switch 24 is provided on each input pipe 23, and a second switch 26 is provided on each input pipe 23. The input end 222 of the condenser and the output end 211 of the compressor are connected through a first pipe 29, and the first pipe 29 is provided with a third switch 210. The output end 211 of the compressor and the input end 222 of the condenser are connected through a second pipe 220, and the second pipe 220 is provided with a radiator 230 buried underground.

[0179] Each energy storage device 10 includes a housing 11, a battery module and a liquid circuit unit 13, and a refrigerant unit 20 is arranged outside the housing 11. The battery module includes a plurality of electrically connected battery cells 12, and the battery module and the liquid circuit unit 13 are arranged inside the housing 11. The liquid circuit unit 13 includes a thermal management component, a heat exchanger 131, a water pump assembly, a heater 133 and a supply tank 138. The output port 20a and the input port 20b of the refrigerant unit 20 are both connected to the heat exchanger 131. The thermal management component is used for heat exchange with the battery module. The liquid outlet of the thermal management component is connected to the heat exchanger 131 through a first connecting pipe 132, the heat exchanger 131 and the water pump assembly are connected through a third connecting pipe 136, the water pump assembly and the heater 133 are connected through a fourth connecting pipe 137, and the heater 133 is connected to the liquid inlet of the thermal management component through a second connecting pipe 134.

[0180] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A refrigerant unit, characterized in that: The refrigerant unit is arranged outside the energy storage device, and is used to provide refrigerant to the heat exchanger of the energy storage device. The refrigerant unit includes: A condenser and a compressor, wherein the compressor is connected to the condenser; The refrigerant unit has an output port and an input port for connecting to the heat exchanger, the input port is used for the refrigerant in the heat exchanger to enter the compressor, and the output port is used for the refrigerant in the condenser to enter the heat exchanger.

2. The refrigerant unit according to claim 1, characterized in that: The refrigerant unit also includes an input pipe, which is connected to the compressor. One end of the input pipe forms the input port. The input pipe is provided with a first switch component, which is used to enable the input pipe to connect the compressor and the heat exchanger or cut off the compressor and the heat exchanger.

3. The refrigerant unit according to claim 1, characterized in that: The refrigerant unit also includes an output pipe, which is connected to the condenser. One end of the output pipe forms the output port. The output pipe is provided with a second switch component, which is used to connect the output pipe to the condenser and the heat exchanger or disconnect the condenser and the heat exchanger.

4. The refrigerant unit according to claim 1, characterized in that: The refrigerant unit has a plurality of input ports and a plurality of output ports, the input ports and the output ports correspond one to one, and one input port and one output port are used to be connected to the heat exchanger of one energy storage device.

5. The refrigerant unit according to claim 4, characterized in that: The refrigerant unit further comprises a confluence device, which connects the input end of the compressor and the plurality of input ports, and is used for confluence of the refrigerants of the plurality of input ports to the input end of the compressor.

6. The refrigerant unit according to claim 5, characterized in that: The refrigerant unit includes a plurality of input pipes, each of which is connected to the confluence device, one end of each of which forms the input port, and the input pipe is provided with a first switch component, which is used to enable the input pipe to connect the compressor and the heat exchanger or disconnect the compressor and the heat exchanger.

7. The refrigerant unit according to claim 5, characterized in that: The flow concentrator device includes a plurality of flow concentrators, at least two of which are connected in series, and among the flow concentrators connected in series, at least one of which is connected to a plurality of input ports.

8. The refrigerant unit according to claim 7, characterized in that: The multiple combiners include a first combiner and a second combiner, the first combiner has multiple first combiner inlets and a first combiner outlet, the second combiner has multiple second combiner inlets and a second combiner outlet, each of the first combiner inlets is connected to at least one of the input ports, the first combiner outlet is connected to one of the second combiner inlets, so as to realize the series connection of the first combiner and the second combiner, the second combiner outlet is connected to the input end of the compressor, and the second combiner inlet is connected to at least one of the input ports.

9. The refrigerant unit according to claim 4, characterized in that: The refrigerant unit further comprises a flow diverter, wherein the flow diverter is connected to the output end of the condenser and the plurality of output ports, and the flow diverter is used to divert the refrigerant at the output end of the condenser to the plurality of output ports.

10. The refrigerant unit according to claim 9, characterized in that: The refrigerant unit includes a plurality of output pipes, each of which is connected to the diverter device, one end of each of which forms the output port, and the output pipe is provided with a second switch component, which is used to enable the output pipe to connect the condenser and the heat exchanger or to disconnect the condenser and the heat exchanger.

11. The refrigerant unit according to claim 9, characterized in that: The flow splitting device includes a plurality of flow splitters, at least two of the flow splitters are connected in series, and among the flow splitters connected in series, at least one of the flow splitters is connected to a plurality of the output ports.

12. The refrigerant unit according to claim 11, characterized in that: The multiple diverters include a first diverter and a second diverter, the first diverter has a plurality of first diverter outlets and a first diverter inlet, the second diverter has a plurality of second diverter outlets and a second diverter inlet, each of the first diverter outlets is connected to at least one of the output ports, the first diverter inlet is connected to one of the second diverter outlets, so as to realize the first diverter and the second diverter being connected in series, the second diverter inlet is connected to the output end of the condenser, and the second diverter outlet is connected to at least one of the output ports.

13. The refrigerant unit according to claim 1, characterized in that: The output end of the compressor and the input end of the condenser are connected through a first pipe, and the first pipe is provided with a third switch component, and the third switch component is used to enable the first pipe to connect the output end of the compressor and the input end of the condenser or cut off the output end of the compressor and the input end of the condenser.

14. The refrigerant unit according to claim 1, characterized in that: The output end of the compressor and the input end of the condenser are connected through a second pipeline, and the second pipeline is provided with a radiator.

15. The refrigerant unit according to claim 14, characterized in that: The radiator is used to be buried underground.

16. The refrigerant unit according to claim 14, characterized in that: The output end of the compressor and the input end of the condenser are connected via a first pipe, and the first pipe is provided with a third switch, and the third switch is used to realize that the first pipe connects the output end of the compressor and the input end of the condenser or cuts off the output end of the compressor and the input end of the condenser; The third switch element and the heat sink are connected in parallel.

17. The refrigerant unit according to claim 1, characterized in that: The refrigerant unit includes a plurality of compressors, and the plurality of compressors are connected in parallel.

18. An energy storage system, characterized in that: include: An energy storage device, comprising a fluid circuit unit and a battery cell, wherein the fluid circuit unit is used to adjust the temperature of the battery cell, and the fluid circuit unit comprises a heat exchanger; According to any one of claims 1 to 17, the input port and the output port are both connected to the heat exchanger.

19. The energy storage system according to claim 18, characterized in that: The liquid circuit unit also includes a thermal management component, which is used to adjust the temperature of the battery cell. The thermal management component has a liquid outlet and a liquid inlet. The liquid outlet is used to provide heat exchange medium to the heat exchanger, and the liquid inlet is used to allow the heat exchange medium in the heat exchanger to enter the thermal management component.

20. The energy storage system according to claim 18, characterized in that: The energy storage device also includes a supply box, which is used to replenish heat exchange medium to the liquid circuit unit.

21. The energy storage system according to claim 18, characterized in that: The energy storage device further includes a thermal expansion valve, which is used to open or close according to the temperature of the heat exchange medium in the heat exchanger to connect the output port and the heat exchanger or disconnect the output port and the heat exchanger.

22. The energy storage system according to claim 18, characterized in that: The liquid circuit unit also includes a pumping device, which is used to provide power for the heat exchange medium to circulate in the liquid circuit unit.

23. The energy storage system according to claim 18, characterized in that: The fluid circuit unit further comprises a heater, and the heater is used for heating the heat exchange medium in the fluid circuit unit.

24. The energy storage system according to claim 18, characterized in that: The energy storage device further comprises a box body, the battery cells are located inside the box body, and the refrigerant unit is located outside the box body.

25. The energy storage system according to claim 18, characterized in that: The input port is detachably connected to the heat exchanger; and / or the output port is detachably connected to the heat exchanger.

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