Energy storage equipment and light storage system

Abstract

The utility model discloses an energy storage device and a light storage system. The energy storage equipment comprises a cabinet and a liquid cooling unit, a refrigerant loop of the liquid cooling unit comprises a compressor, a condenser, a first expansion valve and a first evaporator which are communicated in sequence, and the first evaporator is used for exchanging heat with a cooling liquid loop. The liquid cooling unit further comprises an air duct, a fan and a second evaporator, and the second evaporator is connected with the first evaporator in series or in parallel. The air duct comprises an air inlet, an air outlet, a first sub-air duct and a second sub-air duct, and the air inlet and the air outlet are both communicated with the cavity of the cabinet, so that the air duct is communicated with the cavity of the cabinet. The air channel comprises a first sub-air channel and a second sub-air channel which are continuously arranged, the first sub-air channel communicates with the air inlet, and the extending direction of the second sub-air channel intersects with the extending direction of the first sub-air channel. In the energy storage equipment, the air duct with the bend is designed for the air flowing through the second evaporator, so that liquid in the liquid cooling unit can be effectively prevented from being blown to the cavity of the cabinet, and the dehumidification effect of the cabinet can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy, and in particular to an energy storage device and a photovoltaic storage system. Background Art

[0002] With the continuous development of clean energy, energy storage devices for storing electrical energy have begun to be widely used in various fields. Currently, there is an increasing number of large-scale energy storage devices at the cabinet or container level, which can enhance the energy storage capacity of energy storage devices by configuring more batteries.

[0003] Energy storage devices are typically equipped with liquid cooling units to manage the thermal performance of internal loads such as batteries and power modules, ensuring they remain within a reasonable temperature range and maintain proper operation. Furthermore, liquid cooling units can also incorporate dehumidification capabilities to reduce humidity within the device, thereby minimizing the risk of corrosion to the loads.

[0004] Because the liquid cooling unit's housing is connected to the interior of the energy storage equipment cabinet, the condensed liquid from dehumidification also collects in the housing. This leads to a high risk of liquid in the housing being blown into the cabinet during operation, thus affecting the dehumidification effect. Utility Model Content

[0005] The utility model provides an energy storage device and a solar storage system to reduce the risk of liquid in a liquid cooling unit being blown into a cabinet of the energy storage device, thereby improving the dehumidification effect of the energy storage device.

[0006] In a first aspect, the utility model provides an energy storage device, which includes a cabinet and a liquid cooling unit, and the liquid cooling unit includes a refrigerant circuit and a coolant circuit. The refrigerant circuit includes a compressor, a condenser, a first expansion valve and a first evaporator connected in sequence, and the first evaporator is used to exchange heat with the coolant circuit. In addition, the liquid cooling unit also includes an air duct, a fan and a second evaporator, and the second evaporator is connected in series or in parallel with the first evaporator. The air duct includes an air inlet, an air outlet, a first sub-duct and a second sub-duct, and the air inlet and the air outlet are both connected to the cavity of the cabinet, that is, the air duct is connected to the cavity of the cabinet. In addition, the air duct includes a first sub-duct and a second sub-duct arranged in series, the first sub-duct is connected to the air inlet, and the extension direction of the second sub-duct intersects with the extension direction of the first sub-duct, that is, there is a turning point between the second sub-duct and the first sub-duct. The fan can be used to make air flow from the air inlet to the air outlet. The second evaporator is used to perform heat exchange with air entering the air duct through the air inlet. As the air passes through the second evaporator, the water vapor in the air condenses into liquid, allowing the air to continue circulating through the air duct. In the energy storage device provided by this utility model, a curved air duct is designed for the air flowing through the second evaporator. This utilizes the principle that the inertia of liquid is greater than that of air to separate the liquid from the air. This effectively reduces the risk of liquid accumulated in the air duct being blown into the cabinet, thereby improving the dehumidification effect of the liquid cooling unit.

[0007] In a possible implementation of the present invention, the air duct includes a bottom plate, a first side plate and a second side plate, the air outlet is opened on the bottom plate, and the first side plate is closer to the air inlet relative to the second side plate. The plate surface of the second side plate intersects with the plate surface of the first side plate, that is, there is an angle greater than 0 between the plate surface of the second side plate and the plate surface of the first side plate. The fan is located in the air duct, and the fan outlet of the fan is arranged opposite to the air outlet. In this way, the first side plate and the bottom plate can be used to enclose a first sub-air duct, and the second side plate, the fan casing and the bottom plate can be used to enclose a second sub-air duct. In this implementation, the fan casing can be used to form a second sub-air duct, which is conducive to improving the integration of the liquid cooling unit, thereby helping to improve the layout flexibility of the liquid cooling unit.

[0008] Furthermore, the distance between the end surface of the fan housing facing away from the base plate and the base plate is greater than or equal to the distance between the base plate and the junction of the first and second side plates. This allows the fan housing to largely block liquid flowing from the first sub-duct to the second sub-duct, which helps improve the dehumidification efficiency of the liquid cooling unit.

[0009] In the present invention, the first sub-duct and the second sub-duct can both be surrounded by a plate-like structure. Specifically, the duct includes a bottom plate, a first side plate, a second side plate and a baffle. The air outlet is opened on the bottom plate, and the first side plate is closer to the air inlet relative to the second side plate. The plate surface of the second side plate also intersects with the plate surface of the first side plate, that is, there is an angle greater than 0 between the plate surface of the second side plate and the plate surface of the first side plate. The baffle is accommodated in the air duct, and the baffle is located between the air inlet and the air outlet, and one end of the baffle is connected to the bottom plate. In this implementation, the first side plate and the bottom plate are still used to enclose the first sub-duct, while the second side plate, the baffle and the bottom plate are used to enclose the second sub-duct. This can improve the setting flexibility of the first sub-duct and the second sub-duct, which is beneficial to improving the dehumidification effect of the liquid cooling unit.

[0010] In addition, the distance between the edge of the baffle facing away from the bottom plate and the bottom plate is greater than or equal to the distance between the connection between the first and second side plates and the bottom plate. This allows the baffle to largely block liquid flowing from the first sub-duct to the second sub-duct, which helps improve the dehumidification effect of the liquid cooling unit.

[0011] Because the baffle plate in the air duct can be used together with the bottom plate and the second sidewall to enclose a second sub-duct, this implementation allows for greater flexibility in the placement of the fan. For example, the fan can be located within the air duct, with the fan outlet positioned opposite the air outlet. Alternatively, the fan can be located outside the housing, with the fan inlet positioned opposite the air outlet.

[0012] In one possible implementation of the present invention, the angle between the first side panel and the second side panel, facing away from the bottom panel, is greater than or equal to 90° and less than or equal to 150°. This not only increases the turning angle from the first sub-duct to the second sub-duct, but also increases the spacing between the second side panel and the bottom panel, thereby increasing the width of the second sub-duct. This helps increase the ventilation volume of the duct and thus improves the dehumidification effect.

[0013] The present invention does not limit the location of the air inlet. In a possible implementation, the air inlet is provided on the first side panel.

[0014] In addition, the second evaporator may be located outside the air duct, with at least a portion of the second evaporator positioned opposite the air inlet. Furthermore, the second evaporator may be fixed to the outer wall of the air duct. For example, when the air inlet is provided on the first side panel, the second evaporator may be fixed to the outer wall of the first side panel. This helps reduce the distance between the second evaporator and the air inlet of the housing, thereby improving the utilization rate of the cooling capacity of the second evaporator.

[0015] In addition, the second evaporator can also be located in the air duct, in which case at least part of the second evaporator is arranged opposite the air inlet of the air duct. This is conducive to improving the integration of the liquid cooling unit and can effectively improve the utilization rate of the cooling capacity of the second evaporator.

[0016] In one possible implementation of the present invention, the cabinet includes a cabinet body and a cabinet door, and the liquid cooling unit further includes a housing, which is secured to the side of the cabinet door facing the cabinet body, such that the entire liquid cooling unit is secured to the cabinet door. Furthermore, it will be understood that the air duct, fan, and second evaporator are housed within the housing, and the air outlet of the air duct is disposed on the side wall of the housing facing the cabinet body, so that air dehumidified by the liquid cooling unit can be blown into the cabinet cavity through the air duct. This allows the cabinet to be dehumidified by the liquid cooling unit while also allowing the air cooled by the second evaporator to be used to cool the cabinet.

[0017] In a second aspect, the present invention also provides a photovoltaic storage system comprising a power generation device, a power conversion device, and the energy storage device described in the first aspect, with the power device connected between the power generation device and the energy storage device. The power generation device is configured to store the generated electrical energy in the energy storage device via the power conversion device, thereby utilizing the energy storage device to store electrical energy. The use of this energy storage device can effectively improve the operational reliability of the photovoltaic storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an application scenario of the energy storage device provided in an embodiment of the present utility model;

[0019] Figure 2 A schematic diagram of another application scenario of the energy storage device provided in an embodiment of the present utility model;

[0020] Figure 3 A schematic diagram of the structure of an energy storage device provided in an embodiment of the utility model;

[0021] Figure 4a A system topology diagram of a liquid cooling unit provided in an embodiment of the present application;

[0022] Figure 4b Another system topology diagram of the liquid cooling unit provided in an embodiment of the present application;

[0023] Figure 5 An exploded view of a local structure of a liquid cooling unit provided by an embodiment of the present utility model;

[0024] Figure 6 for Figure 5 A simplified structural diagram of the structure shown;

[0025] Figure 7Another simplified structural diagram of the local structure of the liquid cooling unit provided by an embodiment of the present utility model;

[0026] Figure 8 Another simplified structural diagram of the local structure of the liquid cooling unit provided by an embodiment of the present utility model;

[0027] Figure 9 Another simplified structural schematic diagram of the local structure of the liquid cooling unit provided in an embodiment of the present utility model.

[0028] Reference numerals:

[0029] 1000-power generation equipment; 2000-power conversion equipment; 3000-energy storage equipment; 100-cabinet; 1001-cabinet door; 1002-cabinet body;

[0030] 200-battery module; 300-power module; 400-liquid cooling unit; 4001-compressor; 4002-condenser; 4003-first expansion valve;

[0031] 4004-first evaporator; 4005-first cold plate; 4006-second cold plate; 4007-second evaporator;

[0032] 4008-second expansion valve; 4009-fan; 40091-fan inlet; 40092-fan outlet;

[0033] 4010-housing; 40101-side wall;

[0034] 1- air duct; 101- air inlet; 102- air outlet; 1021- guide plate; 1031- first sub-air duct; 1032- second sub-air duct; 104- bottom plate;

[0035] 105-first side panel; 106-second side panel; 107-baffle;

[0036] 4000-charging pile; 40-connector. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the embodiments of the present invention are all explained using the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the embodiments of the present invention are only used to illustrate the relative position relationship and do not represent the true proportions.

[0038] It should be noted that the following description sets forth specific details to facilitate understanding of the present invention. However, the embodiments of the present invention can be implemented in a variety of ways other than those described herein, and those skilled in the art may make similar generalizations without departing from the scope of the embodiments of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Energy storage devices are devices that store electrical energy in a medium and release it to generate electricity when needed. They can be used in five industrial and commercial energy storage scenarios: small-scale commercial and industrial (e.g., small factories), medium-scale commercial and industrial (e.g., large-scale commercial and industrial), photovoltaic storage and charging stations, and small and medium-sized microgrids (e.g., islands). They can also be used in three power station scenarios: wind-solar energy storage stations, grid energy storage stations, and large microgrids.

[0040] like Figure 1 As shown, Figure 1 A schematic diagram of an application scenario of the energy storage device provided in an embodiment of the present invention is provided, and the application scenario is illustrated using a photovoltaic storage system as an example. The photovoltaic storage system may include a power generation device 1000, a power conversion device 2000, and an energy storage device 3000, wherein the power generation device 1000 may be a photovoltaic module, which can be used to convert solar energy into electrical energy. The power conversion device 2000 is connected between the power generation device 1000 and the energy storage device 3000. The power conversion device 2000 can be used to convert the direct current from the photovoltaic module so that the power of the electrical energy converted by the power generation device 1000 matches the power of the electrical energy that can be stored by the energy storage device 3000, so that the electrical energy converted by the power generation device 1000 can be stored in the energy storage device 3000 through the power conversion device 2000.

[0041] like Figure 2 As shown, Figure 2 This is a schematic diagram of another application scenario for the energy storage device provided by an embodiment of the present invention, using a charging network as an example. The charging network includes a charging station 4000 and an energy storage device 3000. The charging station 4000 and the energy storage device 3000 are electrically connected via a cable. The energy storage device 3000 can provide its stored electrical energy to the charging station 4000. The charging station 4000 has a connector 40 that can be connected to a powered device (such as a vehicle) to charge the powered device.

[0042] In addition, in the embodiment of the present invention, according to the different requirements of the application scenario for power consumption, the energy storage device 3000 can be divided into a cabinet-level energy storage device and a container-level energy storage device. Figure 3 , Figure 3A schematic diagram of the structure of an energy storage device provided in an embodiment of the present invention is provided. This embodiment is described using a cabinet-level energy storage device as an example. The energy storage device 3000 may include a cabinet 100, a battery module 200, and a power module 300. Both the battery module 200 and the power module 300 may be housed in the cabinet 100. The battery module 200 is the basic unit for the energy storage device 1000 to store and release electrical energy. The power module 300 may be used to control the charging and discharging process of the battery module 200. For example, the power module 300 may include a power conversion system (PCS) or a direct current (DCDC). The PCS may be used to convert AC power into DC power and then provide it to the battery module 200, or to convert DC power from the battery module 200 into AC power and then output it. The DCDC may be used to boost the voltage of the battery module 200 to ensure that the total voltage of the battery module 200 is not lower than the rated voltage, thereby improving the stability of the operation of the battery module 200.

[0043] In the above-mentioned energy storage device 3000, the battery module 200 and the power module 300 are the main heat loads, and the temperature of the battery module 200 and the power module 300 is an important condition that affects whether the energy storage device 3000 can operate normally. For the battery module 200, in an environment with a higher temperature, such as in summer or the transition season between spring and autumn, the battery module 200 will generate more heat during the charging and discharging process. In this case, it is often necessary to cool the battery module 200 to ensure the normal operation of the battery module 200; while in winter when the temperature is relatively low, the battery module 200 may cause charging and discharging failures due to low temperature. Therefore, in this case, it is necessary to heat the battery module 200 to ensure the normal operation of the battery module 200. For the power module 300, since the power module 300 always generates a large amount of heat during operation, it is usually necessary to cool the power module 300 in a timely manner under various environmental conditions to ensure its normal operation.

[0044] In addition, in some cases, such as in a low temperature and high humidity environment, the battery module 200 and the power module 300 also need to be dehumidified to reduce the risk of corrosion damage to the battery module 200 and the power module 300.

[0045] Based on this, the current energy storage device 3000 is usually further provided with a liquid cooling unit 400 , which can simultaneously meet the temperature and humidity management requirements of the battery module 200 and the power module 300 . Figure 4a A system topology diagram of a liquid cooling unit provided in an embodiment of the present application. Figure 4aAs shown, the liquid cooling unit 400 includes a refrigerant circuit and a coolant circuit. The refrigerant circuit is a circuit for circulating refrigerant and includes a compressor 4001, a condenser 4002, a first expansion valve 4003, and a first evaporator 4004 connected in sequence. The coolant circuit is a circuit for circulating a coolant such as water and may include a first cold plate 4005 for heat exchange with the battery module 200 and a second cold plate 4006 for heat exchange with the power module 300.

[0046] As the refrigerant circulates in the refrigerant circuit, the temperature of the first evaporator 4004 is relatively low. Therefore, the first evaporator 4004 can be used for heat exchange with the coolant circuit, thereby cooling the coolant in the coolant circuit. Furthermore, the circulation of the coolant in the coolant circuit cools the battery module 200 and the power module 300.

[0047] You can continue to refer to Figure 4a The liquid cooling unit 400 also includes a second evaporator 4007 and a second expansion valve 4008. In this embodiment, the passage formed by the second evaporator 4007 and the second expansion valve 4008 is connected in parallel with the passage formed by the first evaporator 4004 and the first expansion valve 4003. In this way, the compressor 4001, the condenser 4002, the second expansion valve 4008 and the second evaporator 4007 are connected in sequence to form a refrigerant circuit. The refrigerant circulates in the refrigerant circuit to make the temperature of the second evaporator 4007 lower than the dew point temperature.

[0048] In addition, the liquid cooling unit 400 also includes a fan 4009, which is used to force the air in the cabinet to flow across the surface of the second evaporator 4007. Thus, under the action of the fan 4009, the high-temperature and high-humidity air in the cabinet condenses into liquid when it flows across the surface of the second evaporator 4007, thereby dehumidifying the cabinet 100.

[0049] Figure 4b Another system topology diagram of the liquid cooling unit provided in the embodiment of the present application. Figure 4a The difference is that in Figure 4b In the embodiment, the second evaporator 4007 and the first evaporator 4004 are connected in series, so that the second expansion valve 4008 can be omitted, so that the second evaporator 4007 and the first evaporator 4004 share the first expansion valve 4003, thereby simplifying the structure of the liquid cooling unit 400. Figure 4b In the liquid cooling unit 400 shown, the functions of each component are similar to those of Figure 4a The same as in the previous section, will not be described in detail here.

[0050] It is understandable that the second evaporator 4007 and the fan 4009 are usually arranged in the shell 4010 of the liquid cooling unit 400, and the liquid condensed by the second evaporator 4007 will gather in the shell 4010 of the liquid cooling unit 400. This leads to a greater risk that the liquid in the shell 4010 of the liquid cooling unit 400 will be blown into the cabinet 100 during the operation of the liquid cooling unit 400, thereby affecting the dehumidification effect.

[0051] In view of this, the energy storage device provided in the embodiment of the present invention provides an air duct design for air flowing through the second evaporator 4007. This utilizes the principle that the inertia of liquid is greater than that of air to separate the liquid from the air. This effectively reduces the risk of liquid condensed in the second evaporator 4007 being blown into the cabinet, thereby improving the dehumidification effect. To further clarify the objectives, technical solutions, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0052] Figure 5 This is an exploded view of a local structure of a liquid cooling unit provided by an embodiment of the present utility model. Figure 5 As shown, the liquid cooling unit provided by the present invention also includes an air duct 1, which includes an air inlet 101 and an air outlet 102. The air inlet 101 and the air outlet 102 are both connected to the cavity of the cabinet 100 of the energy storage device 3000, thereby connecting the air duct 1 to the cavity of the cabinet 100.

[0053] It is understandable that the fan 4009 can be used to make the air flow from the air inlet 101 to the air outlet 102, so as to drive the air in the cavity of the cabinet 100 to flow through the air duct 103 and then return to the cavity of the cabinet 100, thereby realizing the circulation of air between the cavity of the cabinet 100 and the air duct 1. Based on this, when the fan 4009 is specifically set, as shown in FIG. Figure 5 As shown, the fan 4009 is located in the air duct 1, and the fan outlet 40092 of the fan 4009 is arranged opposite to the air outlet 102.

[0054] From the above introduction to the dehumidification principle of the liquid cooling unit 400, it can be seen that when the high-temperature and high-humidity air flows through the surface of the second evaporator 4007, the water vapor therein can condense into liquid. Based on this, the second evaporator 4007 can be used to perform heat exchange with the air entering the air duct 1 from the air inlet 101, so that the dry air dehumidified by the second evaporator 4007 flows along the air duct 1 to the air outlet 102 under the action of the fan 4009, and is blown toward the cavity of the cabinet 100 through the air outlet 102, thereby realizing dehumidification of the cavity of the cabinet 100 through the circulation of air between the cavity of the cabinet 100 and the air duct 1.

[0055] In order to facilitate the display of the structure of the air duct 1, please refer to Figure 6 , Figure 6 for Figure 5 A simplified structural schematic diagram of the structure shown. In an embodiment of the present invention, the air duct 1 includes a first sub-duct 1031 and a second sub-duct 1032 arranged in series, wherein the first sub-duct 1031 is connected to the air inlet 101, and the extension direction of the second sub-duct 1032 intersects with the extension direction of the first sub-duct 1031. This allows the air flow direction to change when entering the second sub-duct 1032 from the first sub-duct 1031, thereby utilizing the principle that the inertia of liquid is greater than the inertia of air to separate the liquid from the air. This allows the majority of the liquid condensed by the second evaporator 4007 to be blown to the inner wall of the air duct 1 and retained in the air duct 1, while the air continues to flow along the second sub-duct 1032 toward the air outlet 102. This effectively reduces the risk of liquid in the air duct 1 being blown out into the cavity of the cabinet 1 along with the air, thereby improving the dehumidification effect of the liquid cooling unit 400.

[0056] It's worth noting that, in this disclosure, the extension direction of a sub-duct can be understood as the direction of the line connecting the air inlet and outlet ends of the sub-duct, which determines the primary direction of air flow along that sub-duct. Furthermore, the intersecting extension directions of two sub-ducts refer to an angle greater than 0 between their extension directions, thereby creating a bend at the junction of the two sub-ducts.

[0057] In the embodiment of the present invention, the specific formation method of the first sub-duct 1031 and the second sub-duct 1032 is not limited. Figure 6 In the illustrated embodiment, the air duct 1 includes a bottom plate 104 , a first side plate 105 and a second side plate 106 , wherein the air outlet 102 is provided on the bottom plate 104 .

[0058] It is understood that, in the present invention, the second evaporator 4007, the fan 4009 and the air duct 1 can all be accommodated in the housing 4010 of the liquid cooling unit 400. Based on this, when the air duct 1 is specifically arranged, the bottom plate 104 can be the side wall of the housing 4010 of the liquid cooling unit 400 facing the cabinet 1002 (for example, Figure 3 At least part of the side wall 40101 in the cabinet, the air outlet 102 is arranged on the side wall of the shell 4010 facing the cabinet 1002, which is beneficial to improving the integration of the liquid cooling unit 400 and reducing the volume of the liquid cooling unit 400, thereby facilitating the miniaturization design of the energy storage device.

[0059] Furthermore, the present invention does not specify the orientation of the air outlet 102. However, since the air is not only dried but also cooled when passing through the second evaporator 4007, the air outlet 102 can be positioned so as to face a higher temperature area within the cabinet 100 cavity, for example, the battery module 200 or the power module 300. In this way, the liquid cooling unit 400 not only dehumidifies the cabinet 100 cavity but also cools it, thereby reducing energy waste.

[0060] It is worth mentioning that Figure 5 As shown, a guide plate 1021 may be further provided at the air outlet 102 to guide the flow of air from the air duct 1 to the cavity of the cabinet 100. The specific arrangement of the guide plate 1021 may be adjusted according to the heat dissipation requirements of the cavity of the cabinet 100 and is not limited here.

[0061] You can continue to refer to Figure 6 , the first side plate 105 is closer to the air inlet 101 than the second side plate 106, and the first side plate 105 and the bottom plate 104 are used to enclose a first sub-air duct 1031. It is worth mentioning that the air duct 1 also includes Figure 5 As shown, other side panels connected between the first side panel 105 and the bottom panel 104 are used to enclose other parts of the first sub-duct 1031 together with the first side panel 105 and the bottom panel 104 to reduce the risk of air leakage in the first sub-duct 1031, thereby ensuring the ventilation volume of the entire duct 103.

[0062] like Figure 6 As shown, the plate surface of the second side plate 106 intersects with the plate surface of the first side plate 105, and Figure 6 In the embodiment shown, the fan 4009 is located in the air duct 1, and the second side panel 106, the shell of the fan 4009 and the bottom plate 104 can be used to enclose a second sub-air duct 1032, which is beneficial to simplify the structure of the liquid cooling unit 400, thereby facilitating the miniaturization design of the liquid cooling unit 400.

[0063] It is understandable that the turning angle from the first sub-duct 1031 to the second sub-duct 1032, that is, the angle between the extension direction of the first sub-duct 1031 and the extension direction of the second sub-duct 1032, has a certain influence on the blocking effect of the inner wall of the duct 1 on the liquid. Figure 6In the illustrated air duct 1, the angle between the first side panel 105 and the second side panel 106 is greater than or equal to 90° and less than or equal to 150°. This not only increases the turning angle from the first sub-duct 1031 to the second sub-duct 1032, but also increases the spacing between the second side panel 106 and the bottom panel 104, thereby increasing the width of the second sub-duct 1032. This helps increase the ventilation volume of the air duct 1 and thus the dehumidification effect of the liquid cooling unit 400.

[0064] In addition, if Figure 6 As shown, the distance d1 between the end surface of the housing of the fan 4009 facing away from the bottom plate 104 and the bottom plate 104 is greater than or equal to the distance d2 between the connection point a between the first side plate 105 and the second side plate 106 and the bottom plate 104. This allows the housing of the fan 4009 to largely block the liquid flowing from the first sub-duct 1031 to the second sub-duct 1032, which helps improve the dehumidification efficiency of the liquid cooling unit 400.

[0065] In the present invention, the specific location of the air inlet 101 is not limited. For example, Figure 6 In the illustrated embodiment, the air inlet 101 is opened on the first side plate 105 .

[0066] It is understandable that in order to improve the dehumidification effect of the liquid cooling unit 400, at least a portion of the second evaporator 4007 can be arranged opposite to the air inlet 101. Figure 5 and Figure 6 As shown, the second evaporator 4007 can be located outside the air duct 1, and the second evaporator 4007 can be fixed to the outer wall of the air duct 1, and can be fixed to the outer wall of the first side panel 105, which is beneficial to reducing the distance between the second evaporator 4007 and the air inlet 101 of the air duct 1, thereby helping to improve the utilization rate of the cooling capacity of the second evaporator 4007.

[0067] In addition, from the above introduction to the setting position of the second evaporator 4007, it can be understood that as long as the second evaporator 4007 can achieve heat exchange with the air entering the air duct 1 through the air inlet 101, the air can be blown to the turning point between the first sub-duct 1031 and the second sub-duct 1032 after being dried by the second evaporator 4007, thereby achieving the dehumidification effect of the liquid cooling unit 400.

[0068] It is worth mentioning that, in the present invention, by using the second evaporator 4007 for dehumidification and the first evaporator 4004 for heat exchange of the coolant circuit to share a refrigeration system, it is beneficial to reduce the cost of the energy storage device 3000.

[0069] In addition, in order to reasonably utilize the space in the cabinet 100 of the energy storage device 3000, the liquid cooling unit 400 can be set on the cabinet door 1001 of the cabinet 100. Specifically, Figure 3 As shown, the housing 4010 of the liquid cooling unit 400 is fixed to the side of the cabinet door 1001 facing the cabinet body 1002, thereby achieving the installation of the entire liquid cooling unit 400 on the cabinet door 1001. In other possible embodiments, the liquid cooling unit 400 can also be installed at other locations in the cabinet 100 according to the layout space in the cabinet 100.

[0070] After understanding the design principle of the liquid cooling unit 400 of the energy storage device 3000 provided by the present invention, a series of modifications can be made to the specific structure of the liquid cooling unit 400 according to the actual application scenario. Figure 7 , Figure 7 Another simplified structural diagram of the local structure of the liquid cooling unit provided by the embodiment of the present utility model. Figure 6 The structure shown is different in that Figure 7 In the figure, the second evaporator 4007 is located in the air duct 1, and can be located in the first sub-air duct 1031 , which is conducive to improving the integration of the liquid cooling unit 400 and can effectively improve the utilization rate of the cooling capacity of the second evaporator 4007.

[0071] It is worth mentioning that in Figure 7 In the illustrated liquid cooling unit 400, at least a portion of the second evaporator 4007 is disposed opposite the air inlet 101 of the air duct 1. Furthermore, the air inlet 101 can be disposed between the first side panel 105 and the bottom panel 104, facing away from the second sub-air duct 1032. This helps reduce wind resistance to air flow in the air duct 1, thereby improving the efficiency of air circulation between the cabinet 100 cavity and the air duct 1, thereby improving the dehumidification efficiency of the liquid cooling unit 400.

[0072] In other possible embodiments, for the solution in which the second evaporator 4007 is disposed in the air duct 1, the air inlet 101 may also be opened on the first side plate 105. Figure 7 Other structures of the liquid cooling unit 400 shown can refer to Figure 6 The liquid cooling unit 400 shown in FIG is set up, and its detailed description is omitted here.

[0073] Figure 8 Another simplified structural diagram of the local structure of the liquid cooling unit provided by the embodiment of the present utility model. Figure 6 The structure shown is different in that Figure 8In the figure, the fan 4009 is located outside the air duct 1, and the fan 4009 can also be located outside the shell 4010 of the liquid cooling unit, that is, the fan 4009 is directly located in the cavity of the cabinet 100 of the energy storage device 3000. At this time, the fan inlet 40091 and the outlet air 102 are arranged opposite to each other.

[0074] In addition, Figure 8 In the illustrated structure, to form the second sub-duct 1032, the duct 1 further includes a baffle 107, which is housed within the duct 1 and positioned between the air inlet 101 and the air outlet 102. One end of the baffle 107 is connected to the bottom plate 104. Thus, the first side panels 105 and the bottom plate 104 still form the first sub-duct 1031, while the second side panels 106, the baffle 107, and the bottom plate 104 form the second sub-duct 1032.

[0075] It is worth mentioning that in Figure 8 In the illustrated structure, the distance d3 between the edge of the baffle 107 facing away from the bottom plate 104 and the bottom plate 104 is greater than or equal to the distance d2 between the connection point a between the first side plate 105 and the second side plate 106 and the bottom plate 104. This allows the baffle 107 to largely block liquid flowing from the first sub-duct 1031 to the second sub-duct 1032, which helps improve the dehumidification efficiency of the liquid cooling unit 400. In addition, Figure 8 Other structures of the liquid cooling unit 400 shown can be set with reference to the liquid cooling unit 400 in any of the above embodiments, and will not be described in detail here.

[0076] Figure 9 Another simplified structural diagram of the local structure of the liquid cooling unit provided by the embodiment of the present utility model. Figure 6 The structure shown is different in that Figure 9 In the figure, the fan 4009 is located outside the air duct 1, but the fan 4009 is still located inside the shell 4010 of the liquid cooling unit, which is conducive to the modular design of the liquid cooling unit, thereby improving the setting flexibility of the liquid cooling unit.

[0077] In addition, Figure 9 In the structure shown, the bottom plate 104 may be bent so that the bottom plate 104 can be used together with the first side plate 105 to form the first sub-duct 1031 , or can be used together with the second side plate 106 to form the second sub-duct 1032 . Figure 9 Other structures of the liquid cooling unit 400 shown can be set with reference to the liquid cooling unit 400 in any of the above embodiments, and will not be described in detail here.

[0078] The above are only some exemplary descriptions of the specific setting methods of the liquid cooling unit 400 provided by the present invention. Based on the design principle of the liquid cooling unit 400, other adaptive deformations can be made according to the needs of actual application scenarios. For example, multiple bend designs can be formed in the air duct 1 to improve the dehumidification effect. They are not listed one by one here, but they should all be understood to fall within the scope of protection of this application.

[0079] It is worth mentioning that in some possible embodiments of the present invention, the second evaporator 4007, the fan 4009 and the air duct 1 can also be used as an independent module. At this time, the second evaporator 4007 can also be replaced by other devices that can achieve refrigeration, such as cold plates, semiconductor refrigeration devices or magnetic refrigeration devices, which are not listed one by one here.

[0080] In addition, the dehumidification scheme design of the liquid cooling unit 400 provided by the present invention can be applied not only to the energy storage device 3000, but also to various other scenarios with dehumidification requirements, such as household air conditioners, car air conditioners or dryers, etc. Since the specific setting method of the above-mentioned dehumidification scheme in other scenarios is similar to the setting method when it is applied to the energy storage device 3000, its setting method in other scenarios will not be introduced in detail here, but it should be understood that it falls within the scope of protection of this application.

[0081] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An energy storage device, characterized in that: The invention comprises a cabinet and a liquid cooling unit, wherein the liquid cooling unit comprises a refrigerant circuit and a coolant circuit, wherein the refrigerant circuit comprises a compressor, a condenser, a first expansion valve and a first evaporator connected in sequence, wherein the first evaporator is used to exchange heat with the coolant circuit; the liquid cooling unit further comprises an air duct, a fan and a second evaporator, wherein the second evaporator is connected in series or in parallel with the first evaporator, wherein: The air duct includes an air inlet, an air outlet, a first sub-duct, and a second sub-duct, wherein the air inlet and the air outlet are both connected to the cavity of the cabinet; the first sub-duct and the second sub-duct are arranged continuously, the first sub-duct is connected to the air inlet, and the extension direction of the second sub-duct intersects with the extension direction of the first sub-duct; The second evaporator is used to perform heat exchange with the air entering the air duct through the air inlet, and the fan is used to make the air flow from the air inlet to the air outlet.

2. The energy storage device according to claim 1, wherein The air duct includes a bottom plate, a first side plate, and a second side plate. The air outlet is provided on the bottom plate, and the first side plate is closer to the air inlet than the second side plate. The surface of the second side plate intersects with the surface of the first side plate. The fan is located in the air duct, and the fan outlet of the fan is arranged opposite to the air outlet. The first side panel and the bottom panel are used to enclose the first sub-air duct; the second side panel, the fan housing and the bottom panel are used to enclose the second sub-air duct.

3. The energy storage device according to claim 2, characterized in that The distance between the bottom plate and an end surface of the fan housing facing away from the bottom plate is greater than or equal to the distance between the bottom plate and a connection point between the first side plate and the second side plate.

4. The energy storage device according to claim 1, wherein The air duct includes a bottom plate, a first side plate, a second side plate, and a baffle plate, the air outlet is opened on the bottom plate, the first side plate is closer to the air inlet than the second side plate, the plate surface of the second side plate intersects with the plate surface of the first side plate, the baffle plate is accommodated in the air duct, the baffle plate is located between the air inlet and the air outlet, and one end of the baffle plate is connected to the bottom plate; The first side panels and the bottom panel are used to enclose the first sub-air duct; the second side panels, the baffle panels and the bottom panel are used to enclose the second sub-air duct.

5. The energy storage device according to claim 4, characterized in that The distance between the bottom plate and an edge of the baffle plate facing away from the bottom plate is greater than or equal to the distance between the bottom plate and a connection point between the first side plate and the second side plate.

6. The energy storage device according to claim 4 or 5, characterized in that: The fan is located in the air duct, and the fan outlet of the fan is arranged opposite to the air outlet; or the fan is located outside the air duct, and the fan inlet of the fan is arranged opposite to the air outlet.

7. The energy storage device according to any one of claims 2 to 5, characterized in that: An included angle between the first side panel and the second side panel facing away from the bottom panel is greater than or equal to 90° and less than or equal to 150°.

8. The energy storage device according to any one of claims 2 to 5, characterized in that: The air inlet is opened on the first side plate.

9. The energy storage device according to any one of claims 1 to 5, characterized in that: The second evaporator is fixed to the outer side wall of the air duct, and at least a portion of the second evaporator is arranged opposite to the air inlet.

10. The energy storage device according to any one of claims 1 to 5, characterized in that: The second evaporator is located in the air duct, and at least a portion of the second evaporator is arranged opposite to the air inlet.

11. The energy storage device according to any one of claims 1 to 5, characterized in that: The cabinet includes a cabinet body and a cabinet door, and the liquid cooling unit also includes a shell, which is fixed to the side of the cabinet door facing the cabinet body; the air duct, the fan and the second evaporator are accommodated in the shell, and the air outlet of the air duct is arranged on the side wall of the shell facing the cabinet body.

12. A solar storage system, characterized in that: It comprises a power generation device, a power conversion device and an energy storage device as described in any one of claims 1 to 11, wherein the power conversion device is connected between the power generation device and the energy storage device, and the power generation device is used to store the generated electric energy in the energy storage device through the power conversion device.

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