Heat recovery liquid cooling unit and battery swap station

Abstract

The heat recovery liquid cooling unit comprises a dry cooling system and a heat exchange system, the dry cooling system comprises a battery pack heat exchange part, an electric gun heat dissipation part and a secondary refrigerant container, and the heat exchange system is suitable for achieving a single cooling function or a cooling and heating function; the battery pack heat exchange part comprises a first loop, the first loop is connected between a heat exchanger of the heat exchange system and a battery pack, and the first loop is connected with a secondary refrigerant container; the electric gun heat dissipation part comprises a second loop, a third loop and a heat dissipation piece, the second loop is connected between the heat dissipation piece and the electric gun, and the third loop is connected between the secondary refrigerant container and the electric gun; the heat recovery liquid cooling unit can be switched between a heat dissipation mode and a heat recovery mode; in the heat dissipation mode, the secondary refrigerant in the second loop circulates, so that heat dissipation of the heat dissipation piece on the electric gun is achieved; in the heat recovery mode, the secondary refrigerant in the first loop and the secondary refrigerant in the third loop are mixed in the secondary refrigerant container, heat generated by the electric gun is recovered, and the battery pack is heated through recovered heat energy.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioners, and particularly to a heat recovery liquid cooling unit and a battery swapping station. Background Art

[0002] A battery swapping station is used to replace the battery pack of a vehicle (new energy vehicle) or directly charge the vehicle through an electric gun. Heat is generated during the charging and discharging of the battery pack and the operation of the electric gun, and there is a possibility of damage if the temperature exceeds a certain level. In addition, the battery swapping station also needs to provide a low-temperature heating function for the battery pack in low-temperature environments such as winter to ensure its operation within a certain temperature range. To achieve the above functions, existing battery swapping stations need to design a refrigeration and heating system for the battery pack and a heat dissipation system for the electric gun. The system equipment is complex, occupies a large area, and has high energy consumption, resulting in poor economy. Summary of the Utility Model

[0003] A main object of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and to provide a heat recovery liquid cooling unit with low energy consumption.

[0004] To achieve the above object, the present disclosure adopts the following technical solutions:

[0005] According to one aspect of the present disclosure, there is provided a heat recovery liquid cooling unit for realizing the refrigeration and heating of the battery pack of a battery swapping station and the heat dissipation of an electric gun; wherein: the heat recovery liquid cooling unit includes a dry cooling system and a heat exchange system, the dry cooling system includes a battery pack heat exchange part, an electric gun heat dissipation part, and a coolant container, and the heat exchange system is adapted to realize a single cooling function or a cooling and heating function; the battery pack heat exchange part includes a first circuit, the first circuit is connected between the heat exchanger of the heat exchange system and the battery pack, and the first circuit is connected to the coolant container; the electric gun heat dissipation part includes a second circuit, a third circuit, and a heat dissipation member, the second circuit is connected between the heat dissipation member and the electric gun, the third circuit is connected between the coolant container and the electric gun, and the second circuit and the third circuit are arranged in parallel; wherein, the first circuit, the second circuit, and the third circuit are all used for circulating the coolant, and the coolant container is used for storing the coolant; wherein, the heat recovery liquid cooling unit is configured to: selectively switch between a heat dissipation mode and a heat recovery mode; in the heat dissipation mode, the coolant in the first circuit circulates and exchanges heat with the refrigerant of the heat exchange system via the heat exchanger to realize the heat dissipation of the battery pack, and the coolant in the second circuit circulates to realize the heat dissipation of the electric gun by the heat dissipation member; in the heat recovery mode, the coolant in the first circuit and the third circuit mixes in the coolant container to realize the recovery of the heat generated by the electric gun and heat the battery pack with the recovered heat energy.

[0006] According to one embodiment of the present disclosure, control valves are provided on both the third circuit and the second circuit; wherein, through the control valves, in the heat dissipation mode, the coolant in the third circuit does not flow, and in the heat recovery mode, the coolant in the second circuit does not flow.

[0007] According to one embodiment of the present disclosure, the battery pack heat exchange part further includes a first bypass branch. One end of the first bypass branch is connected to the first circuit at a position between the heat exchanger and the coolant container, and the other end of the first bypass branch is connected to the first circuit at a position between the coolant container and the battery pack. The first bypass branch is arranged in parallel with the coolant container, and a first proportional regulating valve is provided on the first bypass branch.

[0008] According to one embodiment of the present disclosure, a water pump is provided on the first circuit between the battery pack and the coolant container; wherein, the battery pack heat exchange part further includes a second bypass branch. One end of the second bypass branch is connected to the first circuit at a position between the water pump and the battery pack, and the other end of the second bypass branch is connected to the first circuit at a position between the heat exchanger and the battery pack. A second proportional regulating valve is provided on the second bypass branch.

[0009] According to one embodiment of the present disclosure, wherein: a water pump and an auxiliary heater are provided on the first circuit, the water pump and the auxiliary heater are connected in series, and in the first circuit connected between the water pump and the auxiliary heater, the flow direction of the coolant is from the water pump to the auxiliary heater; and / or, a sight glass is provided on the coolant container for displaying the liquid level height inside the coolant container; and / or, a steam vacuum valve is provided at the top of the coolant container; and / or, the first circuit has an outlet end connected to the battery pack, and two temperature sensors are provided on the outlet end of the first circuit, and the two temperature sensors are backup to each other.

[0010] According to one embodiment of the present disclosure, wherein: the coolant container is provided with a liquid level switch, a liquid filling port and a liquid discharging port; the liquid level switch has multiple gears, and the multiple gears respectively correspond to multiple different liquid level heights; the liquid filling port is connected with a liquid filling mechanism, and the liquid discharging port is connected with a liquid discharging mechanism; wherein, the liquid filling mechanism and the liquid discharging mechanism are respectively interlocked with the liquid level switch to automatically fill the liquid when the liquid level height in the coolant container is too low, or automatically discharge the liquid when the liquid level height in the coolant container is too high.

[0011] According to one embodiment of the present disclosure, the control components of the dry cooling system and the control components of the heat exchange system are integrated on a control main board.

[0012] According to one embodiment of the present disclosure, the heat exchange system is a low-temperature heat pump system, and the heat exchanger is the water-side heat exchanger of the low-temperature heat pump system.

[0013] According to one embodiment of the present disclosure, the low-temperature heat pump system includes a fourth circuit, a fifth circuit, a plate heat exchanger, and an air-side heat exchanger. The fourth circuit is connected between the plate heat exchanger and the water-side heat exchanger, and the fifth circuit is connected between the plate heat exchanger and the air-side heat exchanger. Wherein, the refrigerant in the fourth circuit exchanges heat with the coolant in the first circuit via the water-side heat exchanger, and the refrigerant in the fourth circuit exchanges heat with the refrigerant in the fifth circuit via the plate heat exchanger; and / or, the low-temperature heat pump system only includes one variable-frequency compressor. Wherein, the low-temperature heat pump system further includes a third bypass branch, the third bypass branch is connected in parallel with the variable-frequency compressor, and a bypass solenoid valve and a capillary tube are arranged on the third bypass branch.

[0014] As can be seen from the above technical solutions, the advantages and positive effects of the heat recovery liquid cooling unit proposed by the present disclosure are as follows:

[0015] The heat recovery liquid cooling unit proposed by the present disclosure includes a dry cooling system and a heat exchange system. The dry cooling system includes a battery pack heat exchange part, a charging gun heat dissipation part, and a coolant container. The heat exchange system is adapted to achieve a single cooling function or a cooling and heating function. The battery pack heat exchange part includes a first circuit, the first circuit is connected between the heat exchanger of the heat exchange system and the battery pack, and the first circuit is connected to the coolant container. The charging gun heat dissipation part includes a second circuit, a third circuit, and a heat dissipation member. The second circuit is connected between the heat dissipation member and the charging gun, the third circuit is connected between the coolant container and the charging gun, and the second circuit and the third circuit are arranged in parallel. The heat recovery liquid cooling unit can be switched between a heat dissipation mode and a heat recovery mode. In the heat dissipation mode, the coolant in the first circuit circulates and exchanges heat with the refrigerant of the heat exchange system via the heat exchanger to achieve heat dissipation of the battery pack, and the coolant in the second circuit circulates to achieve heat dissipation of the charging gun. In the heat recovery mode, the coolant in the first and third circuits is mixed in the coolant container to recover the heat generated by the charging gun and use the recovered heat energy to heat the battery pack. Through the above design, the present disclosure can utilize the coolant container and the third circuit to recover the heat generated by the charging gun, and use the recovered heat to meet at least part of the heating demand of the battery pack, thereby reducing the overall energy consumption of the unit and improving the economy.

[0016] Another main object of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and to provide a battery swapping station adopting the above-mentioned heat recovery liquid cooling unit.

[0017] To achieve the above object, the present disclosure adopts the following technical solutions:

[0018] According to another aspect of the present disclosure, there is provided a battery swapping station, which includes a battery pack, an electric gun, and the heat recovery liquid cooling unit proposed in the present disclosure and described in the above embodiments.

[0019] As can be seen from the above technical solutions, the advantages and positive effects of the heat recovery liquid cooling unit proposed in the present disclosure are as follows:

[0020] The battery swapping station proposed in the present disclosure, by adopting the heat recovery liquid cooling unit proposed in the present disclosure, can recover the heat generated by the electric gun and use the recovered heat to meet at least part of the heating demand of the battery pack, thereby reducing the overall energy consumption of the unit and improving the economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By considering the following detailed description of the preferred embodiments of the present disclosure in conjunction with the accompanying drawings, various objectives, features, and advantages of the present disclosure will become more apparent. The drawings are only exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0022] Figure 1 is a schematic diagram of the dry cooling system of the heat recovery liquid cooling unit shown according to an exemplary embodiment;

[0023] Figures 2 to 4 are respectively Figure 1 schematic diagrams of the dry cooling system in different working modes shown;

[0024] Figure 5 is a schematic diagram of the heat exchange system of the heat recovery liquid cooling unit shown according to an exemplary embodiment;

[0025] Figure 6 is a schematic diagram of the dry cooling system of the heat recovery liquid cooling unit shown according to another exemplary embodiment;

[0026] Figure 7 and Figure 8 are respectively Figure 6 schematic diagrams of the dry cooling system in different working modes shown;

[0027] Figure 9 is a schematic diagram of the dry cooling system of the heat recovery liquid cooling unit shown according to still another exemplary embodiment;

[0028] Figure 10 and Figure 11 are respectively Figure 9 schematic diagrams of the dry cooling system in different working modes shown;

[0029] Figure 12It is a system schematic diagram of the dry cooling system of a heat recovery liquid cooling unit shown according to another exemplary embodiment.

[0030] The description of the reference numerals is as follows:

[0031] 100. Dry cooling system;

[0032] 110. Battery pack heat exchange part;

[0033] 111. First circuit;

[0034] 1111. Water pump;

[0035] 1112. Auxiliary heater;

[0036] 112. First bypass branch;

[0037] 1121. First proportional regulating valve;

[0038] 113. Second bypass branch;

[0039] 1131. Second proportional regulating valve;

[0040] 120. Electric gun heat dissipation part;

[0041] 121. Second circuit;

[0042] 122. Third circuit;

[0043] 123. Heat dissipation element;

[0044] 124. Make-up water valve;

[0045] 130. Carrier refrigerant container;

[0046] 131. Liquid level switch;

[0047] 132. Liquid filling valve;

[0048] 133. Drain valve;

[0049] 134. Steam vacuum valve;

[0050] 200. Heat exchange system;

[0051] 210. Water side heat exchanger;

[0052] 220. Variable frequency compressor;

[0053] 230. Plate heat exchanger;

[0054] 240. Third bypass branch;

[0055] 251. Fourth circuit;

[0056] 252. Fifth circuit;

[0057] 260. Air side heat exchanger;

[0058] 241. Bypass solenoid valve;

[0059] 242. Capillary tube;

[0060] T. Temperature sensor;

[0061] P. Pressure sensor. Detailed implementation manners

[0062] Typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various variations in different embodiments, all of which do not depart from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes in nature and not for limiting the present disclosure.

[0063] In the following description of different exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part of the present disclosure, and in which different exemplary structures, systems, and steps for implementing various aspects of the present disclosure are shown by way of example. It should be understood that other specific solutions of components, structures, exemplary devices, systems, and steps can be used, and structural and functional modifications can be made without departing from the scope of the present disclosure. Moreover, although terms such as "above", "between", "inside" etc. may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein only for convenience, for example, according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present disclosure.

[0064] Refer to Figure 1 , which representatively shows a system schematic diagram of the dry cooling system 100 of the heat recovery liquid cooling unit proposed by the present disclosure. In this exemplary embodiment, the heat recovery liquid cooling unit proposed by the present disclosure is described by taking an application in a battery swapping station as an example. It is easy for those skilled in the art to understand that, in order to apply the relevant designs of the present disclosure to other types of air conditioning systems, various modifications, additions, substitutions, deletions, or other changes are made to the following specific implementation manners, and these changes are still within the scope of the principle of the heat recovery liquid cooling unit proposed by the present disclosure.

[0065] As Figure 1 shown, in an embodiment of the present disclosure, the heat recovery liquid cooling unit proposed by the present disclosure can achieve the refrigeration and heating of the battery pack of the battery swapping station and the heat dissipation of the charging gun. The heat recovery liquid cooling unit includes a dry cooling system 100 and a heat exchange system 200. With reference to Figures 2 to 5 , Figures 2 to 4 respectively representatively show system schematic diagrams of the dry cooling system 100 in different working modes;Figure 5 FIG. 1 schematically shows a heat exchange system 200. In the following, with reference to the above-mentioned drawings, the structures, connection manners, and functional relationships of the main components of the heat recovery liquid cooling unit proposed in the present disclosure will be described in detail.

[0066] As Figure 1 shown, in an embodiment of the present disclosure, the dry cooling system 100 is used to dissipate heat from the electric gun, recover the heat generated by the electric gun and use it for heating the battery pack, and also perform heat exchange with the heat exchange system 200 to achieve cooling and heating (or only cooling) of the battery pack. The heat exchange system 200 is adapted to achieve a single-cooling function or a cooling and heating function, that is, by performing heat exchange with the battery pack heat exchange part 110 of the dry cooling system 100, the heat exchange system 200 can only achieve the cooling function of the battery pack (at this time, the heating of the battery pack is completely achieved by recovering the heat generated by the electric gun), and can also achieve the cooling function and heating function of the battery pack (at this time, the heating of the battery pack can be achieved separately or simultaneously by recovering the heat generated by the electric gun and the heating of the heat exchange system 200).

[0067] As Figure 1 shown, in an embodiment of the present disclosure, the dry cooling system 100 includes a battery pack heat exchange part 110, an electric gun heat dissipation part 120, and a coolant container 130. Specifically, the battery pack heat exchange part 110 includes a first circuit 111, the first circuit 111 is connected between the heat exchanger of the heat exchange system 200 (such as the water-side heat exchanger 210 of the low-temperature heat pump system) and the battery pack, and the first circuit 111 is connected to the coolant container 130. The electric gun heat dissipation part 120 includes a second circuit 121, a third circuit 122, and a heat dissipation member 123. The second circuit 121 is connected between the heat dissipation member 123 and the electric gun, the third circuit 122 is connected between the coolant container 130 and the electric gun, and the second circuit 121 and the third circuit 122 are arranged in parallel. Among them, the first circuit 111, the second circuit 121, and the third circuit 122 are all used for circulating the coolant, the coolant can be, for example but not limited to, water, and the coolant container 130 is used to store the above-mentioned coolant. Accordingly, the heat recovery liquid cooling unit proposed in the present disclosure can selectively switch between a heat dissipation mode and a heat recovery mode. Through the above design, the present disclosure can utilize the coolant container 130 and the third circuit 122 to recover the heat generated by the electric gun, and use the recovered heat to meet at least part of the heating demand of the battery pack, thereby reducing the overall energy consumption of the unit and improving the economy.

[0068] Specifically, in the above-mentioned heat dissipation mode, refer to Figure 2The paths and flow directions indicated by the bold arrow lines therein, where a part of the secondary refrigerant circulates in the second circuit 121. These secondary refrigerants transfer the heat of the electric gun to the heat sink 123 and utilize the heat sink 123 for heat dissipation, for example, by performing heat exchange with the external environment, so as to achieve the heat dissipation of the electric gun by the heat sink 123. Meanwhile, in the heat dissipation mode, another part of the secondary refrigerant circulates in the first circuit 111. These secondary refrigerants transfer the heat of the battery pack to the heat exchanger and perform heat exchange with the refrigerant of the heat exchange system 200 via the heat exchanger, so as to achieve the refrigeration of the battery pack by the heat exchange system 200. Furthermore, in the above heat recovery mode, for example, when the battery pack needs to be heated at low temperature in a winter low-temperature environment, refer to Figure 3 and Figure 4 The paths and flow directions indicated by the bold arrow lines therein, where a part of the secondary refrigerant circulates in the third circuit 122. These secondary refrigerants transfer the heat of the electric gun to the secondary refrigerant container 130. Meanwhile, another part of the secondary refrigerant circulates in the first circuit 111, and the secondary refrigerant circulating in the first circuit 111 and the secondary refrigerant circulating in the third circuit 122 perform mixed heat exchange in the secondary refrigerant container 130, so as to achieve the recovery of the heat generated by the electric gun and use it for heating the battery pack at low temperature. At this time, if the heat exchange system 200 with both refrigeration and heating functions is adopted, then in the heat recovery mode, the heat exchange system 200 can selectively participate (for example, as shown in Figure 3 ) or not participate (for example, as shown in Figure 4 ) in the heating of the battery pack, that is, the heat generated by the electric gun recovered is used to meet all or part of the heating needs of the battery pack. Or, if a heat exchange system 200 with only a refrigeration function is adopted, then in the heat recovery mode, the heat exchange system 200 cannot participate in the heating of the battery pack, that is, the refrigerant of the heat exchange system 200 and the secondary refrigerant in the first circuit 111 do not perform heat exchange in the heat recovery mode (for example, the heat exchanger does not work).

[0069] It should be noted that the above description of the working modes is only exemplary and is not an exhaustive list of all working modes that the present disclosure can achieve. For example, when the battery pack needs to be heated at low temperature in a winter low-temperature environment, the present disclosure may not be limited to only adopting the above heat recovery mode, and the heat sink 123 can also be continued to be used to dissipate the heat of the electric gun (that is, the heat generated by the electric gun is not recovered), and the heat exchange system 200 with both refrigeration and heating functions can be used to independently achieve the heating of the battery pack. Another example is that relevant valve groups (such as proportional regulating valves) can also be set on the second circuit 121 and / or the third circuit 122, so as to introduce a part of the secondary refrigerant derived from the electric gun into the secondary refrigerant container 130 and dissipate the other part of the secondary refrigerant derived from the electric gun via the heat sink 123.

[0070] In an embodiment of the present disclosure, in the specific design of the pipeline, on the basis of ensuring no structural interference with each device, for the pipeline layout of the third circuit 122, a design with the shortest possible length can be adopted. That is, the third circuit 122 is arranged at the shortest distance between the second pipeline and the coolant container 130, and the third circuit 122 is designed with the least number of bends, so that the length of the third circuit 122 is minimized. That is, the heat loss of the part of the coolant carrying the heat generated by the electric gun during the flow through the third circuit 122 is minimized, thereby ensuring the heat recovery efficiency of the electric gun heat generation to the greatest extent and further reducing the overall energy consumption of the unit.

[0071] In an embodiment of the present disclosure, a control valve (such as a solenoid valve) can be provided on the third circuit 122 to control the on / off of the third circuit 122, thereby realizing the control of the heat recovery of the electric gun. For example, the above control valve is closed in the heat dissipation mode and opened in the heat recovery mode. And, a control valve (such as a solenoid valve) can be provided on the second circuit 121 to control the on / off of the second circuit 121, thereby realizing the control of the electric gun heat dissipation. For example, the above control valve is opened in the heat dissipation mode and closed in the heat recovery mode. Accordingly, by controlling the above two parts of control valves, the present disclosure can make the coolant in the third circuit 122 not flow in the heat dissipation mode and make the coolant in the second circuit 121 not communicate in the heat recovery mode. Through the above design, when the control valve is opened, the present disclosure can make the coolant on the electric gun side directly flow into the coolant container 130 and then pass through the heat dissipation member 123, thereby ensuring the heat recovery effect to the greatest extent.

[0072] Furthermore, the third circuit 122 includes two parts of pipelines. One part of the pipeline is connected between a liquid inlet of the coolant container 130 and the electric gun, and the other part of the pipeline is connected between a liquid outlet of the coolant container 130 and the electric gun. On this basis, control valves can be provided on both of the above two parts of the pipelines of the third circuit 122. In some embodiments, a control valve can also be provided only on one of the above two parts of the pipelines of the third circuit 122, and this embodiment is not limiting.

[0073] Such as Figure 1As shown, in an embodiment of the present disclosure, in the first circuit 111 connected between the heat exchanger and the secondary refrigerant container 130, the flow direction of the secondary refrigerant is from the heat exchanger to the secondary refrigerant container 130. In other words, for the first circuit 111 connected between the heat exchanger and the battery pack, the secondary refrigerant container 130 can be arranged between the outlet of the heat exchanger (i.e., the outlet for flowing out the secondary refrigerant, different from another outlet for flowing out the refrigerant connected to other components of the heat exchange system 200) and the inlet at the battery pack. Through the above design, the present disclosure can avoid the too low liquid outlet temperature during the defrosting stage of the unit. In addition, by arranging the secondary refrigerant container 130 at the outlet of the heat exchanger, since the liquid outlet temperature of the heat exchanger fluctuates less, it can further reduce the frequent start and stop of the compressor under low load.

[0074] Referring to Figures 6 to 8 as shown, Figure 6 FIG. shows a schematic diagram of the dry cooling system 100 of a heat recovery liquid cooling unit that can embody the principle of the present disclosure in another exemplary embodiment; Figure 7 and Figure 8 respectively representatively show Figure 6 schematic diagrams of the dry cooling system 100 shown in different working modes.

[0075] As Figure 6 shown, still taking the secondary refrigerant container 130 arranged between the outlet of the heat exchanger and the inlet of the battery pack as an example, in an embodiment of the present disclosure, the battery pack heat exchange part 110 may further include a first bypass branch 112. Specifically, one end of the first bypass branch 112 is connected to a position of the first circuit 111 between the heat exchanger and the secondary refrigerant container 130, and the other end of the first bypass branch 112 is connected to a position of the first circuit 111 between the secondary refrigerant container 130 and the battery pack (further may be connected to a position of the first circuit 111 between the secondary refrigerant container 130 and the following water pump 1111), that is, the first bypass branch 112 is arranged in parallel with the secondary refrigerant container 130. And, a first proportional regulating valve 1121 is arranged on the first bypass branch 112. Through the above design, since the volume of the secondary refrigerant container 130 is relatively large, through the first bypass branch 112 and the first proportional regulating valve 1121, the present disclosure can make the low-temperature or high-temperature secondary refrigerant respond to the battery pack more quickly, improving the response speed of refrigeration and heating.

[0076] Specifically, in the above heat dissipation mode, referring to Figure 7The paths and flow directions indicated by the bold arrow lines therein. In this embodiment, the part of the coolant flowing in the first circuit 111 is further distributed. A part of the coolant flows through the coolant container 130, and another part of the coolant directly bypasses the coolant container 130 (equivalent to short - circuiting the coolant container 130 when the first bypass branch 112 is opened). Of course, the above - mentioned two parts of the coolant flowing in the first circuit 111 can be flexibly distributed via the first proportional regulating valve 1121, or the first proportional regulating valve 1121 can be closed. At this time, the flow state of the first circuit 111 in the heat dissipation mode is the same as that of Figure 1 shown in the embodiment. In addition, in the heat dissipation mode, the heat dissipation principle of the electric gun in this embodiment is basically the same as that of Figure 1 shown in the embodiment, which will not be elaborated here. Furthermore, in the above - mentioned heat recovery mode, referring to Figure 8 the paths and flow directions indicated by the bold arrow lines therein. Similar to the heat dissipation mode, in this embodiment, the first bypass branch 112 is used to further distribute the part of the coolant flowing in the first circuit 111. A part of the coolant flows through the coolant container 130 to exchange heat with the coolant transported by the third circuit 122 to the coolant container 130, and another part of the coolant directly bypasses the coolant container 130 (that is, does not exchange heat with the heat generated by the recovered electric gun in the coolant container 130).

[0077] Referring to Figures 9 to 11 shown, Figure 9 the system schematic diagram of the dry - cooling system 100 of a heat recovery liquid - cooling unit that can embody the principle of the present disclosure in yet another exemplary embodiment is representatively shown; Figure 10 and Figure 11 respectively representatively show Figure 9 the system schematic diagrams of the dry - cooling system 100 shown in different working modes.

[0078] As Figure 9As shown, still taking the coolant container 130 being disposed between the outlet of the heat exchanger and the inlet of the battery pack as an example, in an embodiment of the present disclosure, a water pump 1111 may be provided on the first loop 111 between the battery pack and the coolant container 130. On this basis, the battery pack heat exchange part 110 may further include a second bypass branch 113. One end of the second bypass branch 113 is connected to a position on the first loop 111 between the water pump and the battery pack, and the other end of the second bypass branch 113 is connected to a position on the first loop 111 between the heat exchanger and the battery pack. And, a second proportional regulating valve 1131 is provided on the second bypass branch 113. Among them, the above-mentioned water pump 1111 may adopt a fixed-frequency water pump and be applied in combination with a frequency converter, or may directly adopt a variable-frequency water pump. Since the frequency conversion adjustment ranges that can be achieved by the above two frequency conversion schemes of the water pump 1111 are relatively limited, the present disclosure adopts the second bypass branch 113 and the second proportional regulating valve 1131, which can make the flow rate adjustment range passing through the battery pack wider.

[0079] Specifically, in the above heat dissipation mode, referring to Figure 10 the path and flow direction indicated by the bold arrow lines in. Among them, in this embodiment, this part of the coolant flowing in the first loop 111 is further distributed. One part of the coolant is sent back to the battery pack after being cooled by heat exchange through the heat exchanger, and the other part of the coolant is sent to the first loop 111 connected to the inlet of the heat exchanger again (equivalent to short-circuiting the battery pack when the second bypass branch 113 is opened). Of course, the above two parts of the coolant flowing in the first loop 111 can be flexibly distributed via the second proportional regulating valve 1131, or the second proportional regulating valve 1131 can be closed. At this time, the flow state of the first loop 111 in the heat dissipation mode is substantially the same as that of the Figure 1 shown embodiment. In addition, in the heat dissipation mode, the heat dissipation principle of the electric gun in this embodiment is basically the same as that of the Figure 1 shown embodiment, and will not be elaborated here. Furthermore, in the above heat recovery mode, referring to Figure 11 the path and flow direction indicated by the bold arrow lines in. Among them, similar to the heat dissipation mode, in this embodiment, the second bypass branch 113 is used to further distribute this part of the coolant flowing in the first loop 111. One part of it is sent back to the battery pack after being cooled by heat exchange through the heat exchanger, and the other part of the coolant directly bypasses the battery pack and is sent to the heat exchanger again (that is, it does not directly participate in the refrigeration of the battery pack, but can still be mixed and heat exchanged with the high-temperature coolant input from the battery pack into the first loop 111, so that the temperature of the coolant entering the heat exchanger is reduced).

[0080] Referring to Figure 12 shown, Figure 12FIG. 0 schematically shows a dry cooling system 100 of a heat recovery liquid cooling unit capable of embodying the principles of the present disclosure in yet another exemplary embodiment.

[0081] As Figure 12 shown, still taking the coolant container 130 being disposed between the heat exchanger outlet and the battery pack inlet as an example, in an embodiment of the present disclosure, the battery pack heat exchange part 110 may be provided with both the first bypass branch 112 and the second bypass branch 113 described above, and a water pump is provided on the first loop 111 located between the battery pack and the coolant container 130. Accordingly, by separately controlling the first proportional regulating valve 1121 and the second proportional regulating valve 1131, the present disclosure can achieve the distribution function of the coolant in the first loop 111 as needed.

[0082] As Figure 1 、 Figure 6 、 Figure 9 and Figure 12 shown, in some embodiments of the present disclosure, a water pump 1111 (such as the water pump described above) and an auxiliary heater 1112 may be provided on the first loop 111. The water pump 1111 and the auxiliary heater 1112 are connected in series. In the first loop 111 connecting the water pump 1111 and the auxiliary heater 1112, the flow direction of the coolant is from the water pump 1111 to the auxiliary heater 1112. In other words, taking the flow direction of the coolant in this part of the first loop 111 as a reference, the auxiliary heater 1112 is located downstream of the water pump 1111. Through the above design, the present disclosure can maintain a large water volume for a long time and will not cause frequent over-temperature alarms for heating.

[0083] Based on the design of the auxiliary heater 1112 being provided on the first loop 111, in some embodiments of the present disclosure, the auxiliary heater 1112 may employ a PTC electric heater. Through the above design, since the PTC electric heater has the characteristic that the resistance increases with the increase of temperature and is not prone to over-burning, the present disclosure has higher safety accordingly.

[0084] In some embodiments of the present disclosure, the coolant container 130 may be provided with a sight glass for displaying the liquid level height inside the coolant container 130. Through the above design, the present disclosure can facilitate the staff to see the liquid level situation inside the coolant container 130 from the outside.

[0085] As Figure 1 、 Figure 6 、 Figure 9 and Figure 12As shown, in some embodiments of the present disclosure, the secondary refrigerant container 130 may be provided with a liquid level switch 131, a liquid filling port, and a liquid discharging port. Specifically, the liquid level switch 131 may have multiple gears, and these gears respectively correspond to multiple different liquid surface heights. The liquid filling port is connected to a liquid filling mechanism (not shown in the drawings), and the liquid discharging port is connected to a liquid discharging mechanism (not shown in the drawings). For example, a liquid filling valve 132 may be provided on the pipeline connecting the liquid filling port and the liquid filling mechanism, and a liquid discharging valve 133 may be provided on the pipeline connecting the liquid discharging port and the liquid discharging mechanism. On this basis, the liquid filling mechanism and the liquid discharging mechanism are respectively interlocked with the above-mentioned liquid level switch 131 to automatically fill the liquid when the liquid surface height in the secondary refrigerant container 130 is too low, or automatically discharge the liquid when the liquid surface height in the secondary refrigerant container 130 is too high. Accordingly, excessive secondary refrigerant flows back through the liquid filling port to achieve automatic liquid filling without manual supervision.

[0086] For example, the liquid level switch 131 may include four gears, and these four gears respectively correspond to four different liquid surface heights, such as "lowest gear", "second lowest gear", "second highest gear", and "highest gear". Among them, when the liquid level height of the secondary refrigerant in the secondary refrigerant container 130 reaches the "second lowest gear" or below, the liquid filling mechanism fills the secondary refrigerant container 130 until the liquid level height of the secondary refrigerant reaches the "second highest gear" and then stops filling. When the liquid level height of the secondary refrigerant in the secondary refrigerant container 130 reaches the "highest gear", the liquid discharging mechanism discharges the liquid from the secondary refrigerant container 130 until the liquid level height of the secondary refrigerant reaches the "second highest gear" and then stops filling. When the liquid level height of the secondary refrigerant in the secondary refrigerant container 130 reaches the "lowest gear", the liquid level switch 131 or the relevant control panel may issue an alarm to prompt the operator, or may directly link the control panel to stop the operation of the equipment so that the operator can check whether there is a pipeline leakage problem in the pipeline or equipment.

[0087] As Figure 1 、 Figure 6 、 Figure 9 and Figure 12 As shown, in some embodiments of the present disclosure, a steam vacuum valve 134 may be provided at the top of the secondary refrigerant container 130. Through the above design, the present disclosure utilizes the steam vacuum valve 134 to form a closed system for the circulation of the secondary refrigerant, which is beneficial to reducing the process of oxidation and acidification of the secondary refrigerant with air and extending the service life of the equipment.

[0088] As Figure 1 、 Figure 6 、 Figure 9 and Figure 12As shown, in some embodiments of the present disclosure, the first circuit 111 has an outlet end and a return end connected to the battery pack. Among them, temperature sensors T can be provided on both the outlet end and the return end of the first circuit 111. Accordingly, the outlet temperature and the return temperature of the battery pack heat exchange part 110 (i.e., the first circuit 111) towards the battery pack side are respectively collected by using the temperature sensors T, and these are used as feedback control parameters for controlling related devices or components (such as the heat exchange system 200 and the auxiliary heater 1112, etc.).

[0089] As Figure 1 , Figure 6 , Figure 9 and Figure 12 As shown, based on the design that the outlet end of the first circuit 111 is provided with a temperature sensor T, in some embodiments of the present disclosure, two temperature sensors T can be further provided on the outlet end of the first circuit 111, and these two temperature sensors T are backup to each other, so as to further improve the reliability of the device.

[0090] As Figure 1 , Figure 6 , Figure 9 and Figure 12 As shown, in some embodiments of the present disclosure, the first circuit 111 has an outlet end and a return end connected to the battery pack. Among them, pressure sensors P can be provided on both the outlet end and the return end of the first circuit 111. Accordingly, the outlet pressure and the return pressure of the battery pack heat exchange part 110 (i.e., the first circuit 111) towards the battery pack side are respectively collected by using the pressure sensors P, and these are used as feedback control parameters for controlling related devices or components (such as the water pump 1111, the first proportional regulating valve 1121, and the second proportional regulating valve 1131, etc.).

[0091] As Figure 1 , Figure 6 , Figure 9 and Figure 12 As shown, in some embodiments of the present disclosure, the second circuit 121 has an outlet end and a return end connected to the electric gun. In addition, since the electric gun heat dissipation part 120 includes the second circuit 121 and the third circuit 122 connected in parallel, the above-mentioned outlet end and return end can be understood as the connection ends shared by the second circuit 121 and the second circuit 121 and connected to the electric gun side. Among them, temperature sensors T can be provided on both the outlet end and the return end of the second circuit 121. Accordingly, the outlet temperature and the return temperature of the electric gun heat dissipation part 120 (i.e., the second circuit 121 or the third circuit 122) towards the electric gun side are respectively collected by using the temperature sensors T, and these are used as feedback control parameters for controlling related devices or components (such as the heat dissipation member 123, etc.).

[0092] As Figure 1 ,Figure 6 , Figure 9 and Figure 12 As shown in Figure 6 , Figure 9 and Figure 12 , in some embodiments of the present disclosure, the second circuit 121 is connected to the liquid outlet end and the liquid return end of the electric gun. In addition, since the heat dissipation part 120 of the electric gun includes the relatively parallel second circuit 121 and the third circuit 122, the above-mentioned liquid outlet end and liquid return end can be understood as the connection ends shared by the second circuit 121 and the second circuit 121 and connected to the electric gun side. Among them, pressure sensors P can be provided on both the liquid outlet end and the liquid return end of the second circuit 121. Accordingly, the pressure sensors P are used to collect the liquid outlet pressure and the liquid return pressure of the heat dissipation part 120 of the electric gun (i.e., the second circuit 121 or the third circuit 122) to the electric gun side respectively, and these are used as feedback control parameters for controlling related devices or components (such as the water replenishing valve 124 provided at the liquid outlet end).

[0093] As Figure 1 , Figure 6 , Figure 9 and Figure 12 As shown in Figure 1 , Figure 6 , Figure 9 and Figure 12 , in some embodiments of the present disclosure, a temperature sensor T can be provided in the coolant container 130. Accordingly, the temperature sensor T is used to collect the temperature of the coolant in the coolant container 130.

[0094] In an embodiment of the present disclosure, the control components of the dry cooling system 100 and the control components of the heat exchange system 200 can both be integrated on a control main board. Through the above design, the present disclosure can realize the modular assembly of the dry cooling system 100 and the heat exchange system 200 (such as a low-temperature heat pump system), integrate the main control of the two parts of the system at the low-temperature heat pump system and only one main board is required. The integrated design saves the overall cost and floor area, and reduces the on-site equipment construction content.

[0095] As Figure 5 As shown in Figure 5 , in an embodiment of the present disclosure, the heat exchange system 200 can be a low-temperature heat pump system. Accordingly, the heat exchanger of the above-mentioned heat exchange system 200 is the water-side heat exchanger 210 of the low-temperature heat pump system. Through the above design, the present disclosure uses a low-temperature heat pump system to replace the single-cooling electric liquid cooling unit in the existing solution. Since the low-temperature heat pump system uses a plate heat exchanger 230 (economizer), the condensed refrigerant further exchanges heat with part of the low-temperature refrigerant throttled by the electronic expansion valve (EXV) in the plate heat exchanger 230, so as to ensure the subcooling degree of the refrigerant when it enters the throttling assembly, thereby further improving the overall energy efficiency of the unit.

[0096] It should be noted that, according to the drawings of the heat dissipation mode and the heat recovery mode in the above several embodiments, since the low-temperature heat pump system performs two-way heat exchange based on the same working principle to achieve the refrigeration or heating function, in the relevant drawings, such as Figure 2 and Figure 3As shown, the refrigerant flow direction on the left side of the heat exchanger in the heat dissipation mode is opposite to that on the left side of the heat exchanger in the heat recovery mode. It should be understood that in other embodiments, the present disclosure may also adopt other existing heat exchange systems 200 with single cooling function or heating and cooling functions. Moreover, when adopting the heat exchange system 200 with single cooling function, the heating of the battery pack is entirely achieved by the heat generated by the recovery electric gun (which may also include a part of the heat generated by the above-mentioned auxiliary heater 1112).

[0097] As Figure 5 shown, in an embodiment of the present disclosure, the low-temperature heat pump system may include a fourth circuit 251, a fifth circuit 252, a plate heat exchanger 230, and an air-side heat exchanger 260. Specifically, the fourth circuit 251 is connected between the plate heat exchanger 230 and the water-side heat exchanger 210, and the fifth circuit 252 is connected between the plate heat exchanger 230 and the air-side heat exchanger 260. On this basis, the refrigerant in the fourth circuit 251 exchanges heat with the coolant in the first circuit 111 via the water-side heat exchanger 210, and the refrigerant in the fourth circuit 251 exchanges heat with the refrigerant in the fifth circuit 252 via the plate heat exchanger 230.

[0098] As Figure 5 shown, in an embodiment of the present disclosure, the low-temperature heat pump system may only include a variable-frequency compressor 220. On this basis, the low-temperature heat pump system may further include a third bypass branch 240, which is connected in parallel with the variable-frequency compressor 220, and a bypass solenoid valve 241 and a capillary tube 242 are provided on the third bypass branch 240. Through the above design, the present disclosure can further reduce the minimum cooling and heating capacity of the low-temperature heat pump system, so as to adapt to working conditions with smaller loads. In addition, compared with the existing dual-compressor scheme, the present disclosure reduces the equipment costs of a set of compressor, frequency converter, pipeline, etc., and can achieve the same adjustment effect to meet the on-site requirements.

[0099] It should be noted here that the heat recovery liquid-cooled units shown in the drawings and described in this specification are only several examples of the many heat recovery liquid-cooled units that can adopt the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the heat recovery liquid-cooled units shown in the drawings or described in this specification.

[0100] In summary, the heat recovery liquid cooling unit proposed by the present disclosure includes a dry cooling system 100 and a heat exchange system 200. The dry cooling system 100 includes a battery pack heat exchange part 110, a charging gun heat dissipation part 120 and a coolant container 130. The heat exchange system 200 is adapted to achieve a single cooling function or a cooling and heating function; the battery pack heat exchange part 110 includes a first circuit 111, and the first circuit 111 is connected between the heat exchanger of the heat exchange system 200 and the battery pack, and the first circuit 111 is connected to the coolant container 130; the charging gun heat dissipation part 120 includes a second circuit 121, a third circuit 122 and a heat dissipation member 123. The second circuit 121 is connected between the heat dissipation member 123 and the charging gun, and the third circuit 122 is connected between the coolant container 130 and the charging gun. The second circuit 121 and the third circuit 122 are arranged in parallel; the heat recovery liquid cooling unit can be switched between a heat dissipation mode and a heat recovery mode; in the heat dissipation mode, the coolant in the first circuit 111 circulates and exchanges heat with the refrigerant of the heat exchange system 200 via the heat exchanger to achieve heat dissipation of the battery pack, and the coolant in the second circuit 121 circulates to achieve heat dissipation of the charging gun; in the heat recovery mode, the coolants in the first and third circuits 122 are mixed in the coolant container 130 to recover the heat generated by the charging gun and heat the battery pack with the recovered heat energy. Through the above design, the present disclosure can utilize the coolant container 130 and the third circuit 122 to recover the heat generated by the charging gun, and use the recovered heat to meet at least part of the heating requirement of the battery pack, thereby reducing the overall energy consumption of the unit and improving the economy.

[0101] Based on the above detailed description of several exemplary embodiments of the heat recovery liquid cooling unit proposed by the present disclosure, an exemplary embodiment of the battery swapping station proposed by the present disclosure will be described below.

[0102] In an embodiment of the present disclosure, the battery swapping station proposed by the present disclosure includes a battery pack, a charging gun and the heat recovery liquid cooling unit proposed by the present disclosure and described in detail in the above embodiments. Among them, in the battery swapping station, the battery pack is charged in the heat exchange station, and the battery swapping station is also equipped with a charging pile (i.e., a charging gun). When the battery pack is not charging or discharging, the heat demand is small. When the ambient temperature is low (such as in winter), the battery pack needs to be maintained at a certain temperature. The heat recovery of the charging gun can be used to maintain the constant temperature of the battery pack, and the heat exchange system (such as the compressor of the low-temperature heat pump system) can be avoided from starting when the heat demand is low. Accordingly, the frequent start of the heat exchange system can be reduced when the heating demand is low, and the overall energy efficiency of the unit can be improved.

[0103] It should be noted here that the battery swapping stations shown in the drawings and described in this specification are only a few examples of the many battery swapping stations that can adopt the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the battery swapping stations shown in the drawings or described in this specification.

[0104] In summary, for the swapping station proposed by the present disclosure, by adopting the heat recovery liquid cooling unit proposed by the present disclosure, the heat generated by the charging gun can be recovered, and the recovered heat can be used to meet at least part of the heating demand for the battery pack, thereby reducing the overall energy consumption of the unit and improving the economy.

[0105] The exemplary embodiments of the heat recovery liquid cooling unit and the swapping station proposed by the present disclosure have been described in detail above and / or illustrated. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein. On the contrary, each component and / or step of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or each step of one embodiment can also be combined with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", and "the above" etc. are used to indicate the existence of one or more elements / components / etc. The terms "comprising", "including", and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. Furthermore, the terms "first" and "second" etc. in the claims and the specification are only used as labels and are not numerical limitations on their objects.

[0106] Although the heat recovery liquid cooling unit and the swapping station proposed by the present disclosure have been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the embodiments of the present disclosure within the spirit and scope of the claims.

Claims

1. A heat recovery liquid cooling unit, used to achieve cooling and heating of battery packs and heat dissipation of electric guns in battery swap stations; characterized by: The heat recovery liquid cooling unit comprises a dry cooling system (100) and a heat exchange system (200), wherein the dry cooling system (100) comprises a battery pack heat exchange part (110), an electric gun heat dissipation part (120) and a coolant container (130), and the heat exchange system (200) is suitable for realizing a single cooling function or a cooling and heating function; The battery pack heat exchange part (110) comprises a first circuit (111), the first circuit (111) is connected between the heat exchanger of the heat exchange system (200) and the battery pack, and the first circuit (111) is connected to the coolant container (130); The heat dissipation part (120) of the electric gun comprises a second circuit (121), a third circuit (122) and a heat sink (123), wherein the second circuit (121) is connected between the heat sink (123) and the electric gun, and the third circuit (122) is connected between the coolant container (130) and the electric gun, and the second circuit (121) and the third circuit (122) are arranged in parallel; The first circuit (111), the second circuit (121) and the third circuit (122) are all used for circulating a coolant, and the coolant container (130) is used for storing a coolant; The heat recovery liquid cooling unit is configured to selectively switch between a heat dissipation mode and a heat recovery mode; in the heat dissipation mode, the coolant in the first circuit (111) circulates and exchanges heat with the refrigerant of the heat exchange system (200) via the heat exchanger to dissipate heat for the battery pack, and the coolant in the second circuit (121) circulates to dissipate heat for the electric gun by the heat sink (123); in the heat recovery mode, the coolants in the first circuit (111) and the third circuit (122) are mixed in the coolant container (130) to recover the heat generated by the electric gun and heat the battery pack with the recovered heat energy.

2. The heat recovery liquid cooling unit according to claim 1, characterized in that: The third circuit (122) and the second circuit (121) are both provided with control valve components; wherein, through the control valve components, in the heat dissipation mode, the refrigerant in the third circuit (122) does not circulate, and in the heat recovery mode, the refrigerant in the second circuit (121) does not circulate.

3. The heat recovery liquid cooling unit according to claim 2, characterized in that: The battery pack heat exchange part (110) further comprises a first bypass branch (112), one end of the first bypass branch (112) being connected to the first circuit (111) at a position between the heat exchanger and the coolant container (130), the other end of the first bypass branch (112) being connected to the first circuit (111) at a position between the coolant container (130) and the battery pack, the first bypass branch (112) being arranged in parallel with the coolant container (130), and a first proportional regulating valve (1121) being arranged on the first bypass branch (112).

4. The heat recovery liquid cooling unit according to claim 2, characterized in that: A water pump (1111) is provided on the first circuit (111) between the battery pack and the coolant container (130); wherein the battery pack heat exchange portion (110) further comprises a second bypass branch (113), one end of the second bypass branch (113) being connected to a position of the first circuit (111) between the water pump (1111) and the battery pack, and the other end of the second bypass branch (113) being connected to a position of the first circuit (111) between the heat exchanger and the battery pack, and a second proportional regulating valve (1131) being provided on the second bypass branch (113).

5. The heat recovery liquid cooling unit according to claim 1, characterized in that: The first circuit (111) is provided with a water pump (1111) and an auxiliary heater (1112); the water pump (1111) and the auxiliary heater (1112) are relatively connected in series; in the first circuit (111) connected between the water pump (1111) and the auxiliary heater (1112), the coolant flows from the water pump (1111) to the auxiliary heater (1112); and / or The coolant container (130) is provided with a sight glass, and the sight glass is used to display the liquid level inside the coolant container (130); and / or A steam vacuum valve (134) is provided on the top of the coolant container (130); and / or The first circuit (111) has a liquid outlet end connected to the battery pack, and two temperature sensors (T) are arranged on the liquid outlet end of the first circuit (111), and the two temperature sensors (T) serve as backup for each other.

6. The heat recovery liquid cooling unit according to claim 1, characterized in that: The coolant container (130) is provided with a liquid level switch (131), a liquid replenishing port and a liquid draining port; the liquid level switch (131) has a plurality of gears, and the plurality of gears correspond to a plurality of different liquid level heights; the liquid replenishing port is connected to a liquid replenishing mechanism, and the liquid draining port is connected to a liquid draining mechanism; wherein the liquid replenishing mechanism and the liquid draining mechanism are respectively interlocked with the liquid level switch (131) to automatically replenish liquid when the liquid level in the coolant container (130) is too low, or automatically drain liquid when the liquid level in the coolant container (130) is too high.

7. The heat recovery liquid cooling unit according to claim 1, characterized in that: The control components of the dry cooling system (100) and the control components of the heat exchange system (200) are integrated on a control main board.

8. The heat recovery liquid cooling unit according to any one of claims 1 to 7, characterized in that: The heat exchange system (200) is a low-temperature heat pump system, and the heat exchanger is a water-side heat exchanger (210) of the low-temperature heat pump system.

9. The heat recovery liquid cooling unit according to claim 8, characterized in that: The low-temperature heat pump system comprises a fourth circuit (251), a fifth circuit (252), a plate heat exchanger (230) and an air-side heat exchanger (260); the fourth circuit (251) is connected between the plate heat exchanger (230) and the water-side heat exchanger (210); the fifth circuit (252) is connected between the plate heat exchanger (230) and the air-side heat exchanger (260); wherein the refrigerant in the fourth circuit (251) exchanges heat with the secondary refrigerant in the first circuit (111) via the water-side heat exchanger (210), and the refrigerant in the fourth circuit (251) exchanges heat with the refrigerant in the fifth circuit (252) via the plate heat exchanger (230); and / or The low-temperature heat pump system comprises only one variable-frequency compressor (220); wherein the low-temperature heat pump system further comprises a third bypass branch (240), the third bypass branch (240) being relatively connected in parallel with the variable-frequency compressor (220), and a bypass solenoid valve (241) and a capillary tube (242) being provided on the third bypass branch (240).

10. A battery swap station, characterized in that: It comprises a battery pack, an electric gun and a heat recovery liquid cooling unit as claimed in any one of claims 1 to 9.

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