Heat recovery system of charging station and control method thereof

Abstract

The invention relates to a heat recovery system of a charging station and a control method thereof, relates to the technical field of charging station cooling equipment, and aims to solve the heat dissipation problem of a charging pile in a rapid charging process. In the heat recovery system of the charging station, a first circulation loop comprises a liquid cooler, a first circulation pump and a cooling tank which are sequentially communicated, the liquid cooler is arranged at a charging pile, and the first circulation pump is used for driving cooling liquid to circularly flow between the liquid cooler and the cooling tank, so that the liquid cooler cools the charging pile. The second circulation loop comprises a compressor, an evaporation heat exchanger, a condensation heat exchanger, a fin type heat exchanger and a throttler. And the second circulation loop is configured to enable two of the evaporation heat exchanger, the condensation heat exchanger and the fin type heat exchanger to be connected into refrigerant circulation, the compressor is used for compressing and driving the refrigerant to circularly flow, and the throttler is used for reducing pressure and cooling the refrigerant. The evaporation heat exchanger is used for cooling the cooling liquid in the cooling tank, and the condensation heat exchanger is used for heating the liquid in the liquid storage tank.

Description

Technical Field

[0001] This application relates to the field of charging station cooling equipment technology, and in particular to a heat recovery system for a charging station and its control method. Background Technology

[0002] With the rapid popularization of new energy vehicles, high-power DC fast charging piles are increasingly used in charging stations. During fast charging, power devices such as IGBTs (Insulated Gate Bipolar Transistors) inside the charging pile operate continuously under high current and high voltage, thereby generating a large amount of heat.

[0003] If this heat cannot be dissipated in a timely and effective manner, the temperature of the power devices will rise sharply. The high temperature of the power devices and other electronic components will trigger the protection mechanism, resulting in a reduction in charging power and charging efficiency. In severe cases, it may even cause equipment failure or damage, affecting the stable operation of the charging station and the user experience. Summary of the Invention

[0004] This application provides a heat recovery system and control method for a charging station to solve the heat dissipation problem of charging piles during fast charging.

[0005] This application provides a heat recovery system for a charging station, including a charging pile, a storage tank, a first circulation loop, and a second circulation loop. The first circulation loop includes a liquid cooler, a first circulation pump, and a cooling tank connected in sequence. The liquid cooler is located at the charging pile. The first circulation pump drives the coolant to circulate between the liquid cooler and the cooling tank, thereby cooling the charging pile. The second circulation loop includes a compressor, an evaporative heat exchanger, a condenser heat exchanger, a finned heat exchanger, and a throttling device. The second circulation loop is configured such that two of the evaporative heat exchanger, condenser heat exchanger, and finned heat exchanger are connected to the refrigerant circulation system. The compressor compresses and drives the refrigerant circulation, and the throttling device reduces the pressure and temperature of the refrigerant. The evaporative heat exchanger cools the coolant in the cooling tank, and the condenser heat exchanger heats the liquid in the storage tank.

[0006] In some embodiments, the second circulation loop includes a four-way valve having four ports; the throttle includes a first expansion valve, a second expansion valve, and a third expansion valve; The compressor has a return port and an exhaust port. The return port is connected to the first port of the four-way valve, and the exhaust port is connected to the second port of the four-way valve. One end of the finned heat exchanger is connected to the third port of the four-way valve, and the other end of the finned heat exchanger is connected to the fourth port of the four-way valve in sequence via the second expansion valve, the third expansion valve, and the evaporative heat exchanger. One end of the first expansion valve is connected between the second and third expansion valves, and the other end of the first expansion valve is connected to the exhaust port via a condenser heat exchanger.

[0007] In some implementations, the heat recovery system of the charging station also includes a control module, and the compressor, four-way valve, first expansion valve, second expansion valve and third expansion valve are all electrically connected to the control module; The control module controls the opening of the first and third expansion valves, the connection between the first and fourth ports, the connection between the second and third ports, the closing of the second expansion valve and the start of the compressor, so as to switch the second circulation loop to the first mode; The control module controls the opening of the first expansion valve and the second expansion valve, the first port and the third port are connected, the second port and the fourth port are connected, the third expansion valve is closed and the compressor is started, so as to switch the second circulation loop to the second mode; The control module controls the opening of the second and third expansion valves, the connection between the first and third ports, the connection between the second and fourth ports, the closing of the first expansion valve and the start of the compressor, so as to switch the second circulation loop to the third mode; The control module controls the first expansion valve, the second expansion valve, the third expansion valve and the compressor to shut down, so as to switch the second circulation loop to the fourth mode.

[0008] In some implementations, the heat recovery system of the charging station includes a second circulation pump; The condensing heat exchanger includes a first heat exchange channel and a second heat exchange channel, which are isolated from each other and used for heat exchange; the first heat exchange channel is connected between the exhaust port and the first expansion valve; the liquid storage tank, the second circulation pump, and the second heat exchange channel are sequentially circulated and connected.

[0009] In some implementations, the heat recovery system of the charging station includes a first valve, and the number of the first valve and the liquid storage tank is at least two; A liquid storage tank and a first valve are connected to form a water storage branch, at least two water storage branches are set in parallel, and at least two first valves and a second circulation pump are electrically connected to the control module.

[0010] In some implementations, the heat recovery system of the charging station includes a third circulation loop, which includes: At least two second valves, one of which is connected to a storage tank to form a drainage branch, and at least two drainage branches are connected in parallel; Water collector; The water distributor, water collector, drainage branch and water distributor are connected in sequence; At least two water supply branches are connected in parallel between the water distributor and the water collector; And a third circulation pump, located at the distributor or collector, is used to drive the liquid to circulate between the drainage branch and the water supply branch.

[0011] In some implementations, the heat recovery system of the charging station includes: At least two first temperature sensors are provided, with at least one first temperature sensor installed in a liquid storage tank to detect the liquid temperature inside the tank; A second temperature sensor, located inside the cooling tank, is used to detect the temperature of the coolant; the first and second temperature sensors are electrically connected to the control module.

[0012] In some implementations, the first circulation loop includes a distributor and a collector; The number of liquid coolers and charging piles is at least two, with one charging pile corresponding to one liquid cooler; The number of first circulation pumps is at least two, one liquid cooler is connected to one first circulation pump to form a cooling branch, and at least two cooling branches are connected in parallel between the distributor and the collector, and the distributor and the collector are connected to the cooling tank.

[0013] In some implementations, the first circulation loop includes a distributor, a collector, and a third valve; The number of liquid coolers and charging piles is at least two, with one charging pile corresponding to one liquid cooler; The number of third valves is at least two. One liquid cooler is connected to one third valve to form a cooling branch. At least two cooling branches are connected in parallel between the distributor and the collector, and the distributor and the collector are connected to the cooling tank. The first circulation pump is connected between the distributor and the cooling tank; or... The first circulation pump is connected between the liquid collector and the cooling tank.

[0014] In some embodiments, the evaporative heat exchanger is a coil structure disposed within a cooling tank; or, The evaporative heat exchanger includes a third heat exchange channel and a fourth heat exchange channel, which are isolated from each other and used for heat exchange. The third heat exchange channel is located in the second circulation loop. The heat recovery system of the charging station includes a fourth circulation pump, and the fourth heat exchange channel is circulated and connected to the cooling tank via the fourth circulation pump.

[0015] In a second aspect, embodiments of this application provide a control method for a heat recovery system of a charging station, used to control the heat recovery system of the charging station in the first aspect, the control method comprising: Obtain the cooling temperature in the cooling tank and the liquid storage temperature in the storage tank; Compare whether the cooling temperature and the liquid storage temperature meet the preset thresholds; If the cooling temperature is greater than or equal to the first threshold and the liquid storage temperature is less than the second threshold, the second circulation loop is controlled to execute the first mode; If the cooling temperature is greater than or equal to the first threshold, and the liquid storage temperature is greater than or equal to the second threshold, control the second circulation loop to execute the third mode; In the first mode, the evaporator and condenser are connected to the second circulation loop; in the third mode, the evaporator and finned heat exchanger are connected to the second circulation loop.

[0016] In some implementations, after comparing whether the cooling temperature and the reservoir temperature meet a preset threshold, the control method includes: If the cooling temperature is less than the third threshold and the liquid temperature is greater than or equal to the second threshold, control the second circulation loop to execute the fourth mode; If the cooling temperature is less than the third threshold and the liquid storage temperature is less than the fourth threshold, control the second circulation loop to execute the second mode; Among them, the third threshold is less than the first threshold, and the fourth threshold is less than the second threshold; in the second mode, the finned heat exchanger and the condenser heat exchanger are connected to the second circulation loop; in the fourth mode, the compressor and the throttle are shut down.

[0017] In some implementations, the number of storage tanks is at least two and they are arranged in parallel. After comparing whether the cooling temperature and the liquid storage temperature meet the preset thresholds, the control method includes: When the cooling temperature is below the third threshold; If the liquid temperature in at least one storage tank is less than the fourth threshold, control the second circulation loop to execute the second mode; If all the liquid storage temperatures are greater than or equal to the fourth threshold, and at least one liquid storage temperature is less than the second threshold, control the second circulation loop to execute the fourth mode.

[0018] In some implementations, the first threshold value ranges from 45 to 55°C, and the third threshold value ranges from 15 to 25°C.

[0019] In some implementations, the second threshold is in the range of 50-60°C, and the fourth threshold is in the range of 25-30°C.

[0020] In some embodiments, after comparing whether the cooling temperature and the liquid storage temperature meet preset thresholds, if the cooling temperature is greater than or equal to a third threshold and less than a first threshold, the control method includes: If the temperature of the storage liquid is greater than or equal to the second threshold, and the total load ratio of the charging pile is greater than or equal to the fifth threshold, the second circulation loop is controlled to execute the third mode. If the temperature of the storage liquid is greater than or equal to the fourth threshold, and the total load ratio of the charging pile is less than the fifth threshold, the second circulation loop is controlled to execute the fourth mode. Among them, the third threshold is less than the first threshold, and the fourth threshold is less than the second threshold; in the fourth mode, the compressor and throttle are controlled to shut down.

[0021] In some implementations, the number of storage tanks is at least two and they are arranged in parallel. When the cooling temperature is greater than or equal to the third threshold and less than the first threshold, the control method includes: If the liquid temperature of at least one storage tank is less than the fourth threshold and the total load ratio of the charging pile is less than the fifth threshold, the second circulation loop is controlled to execute the second mode. If the liquid temperature of at least one storage tank is less than the second threshold, and the total load ratio of the charging pile is greater than or equal to the fifth threshold, the second circulation loop is controlled to execute the first mode. In the second mode, the finned heat exchanger and the condenser heat exchanger are connected to the second circulation loop.

[0022] Thirdly, embodiments of this application provide a control method for a heat recovery system of a charging station, used to control the heat recovery system of the charging station in the first aspect, wherein the number of storage tanks is at least two and they are arranged in parallel, and the control method includes: When the second loop is in either the first or second mode; Obtain and compare the relationship between the total load ratio of charging piles and the fifth threshold. If the total load ratio of the charging pile is greater than or equal to the fifth threshold, control the simultaneous heating of at least two liquid storage tanks; If the total load ratio of the charging pile is less than the fifth threshold, obtain and determine the relationship between the liquid storage temperature of each liquid storage tank and the fourth threshold. If the liquid temperature of all the liquid storage tanks is greater than or equal to the fourth threshold, control the heating of the liquid storage tank with the lower liquid temperature. If the liquid temperature of at least one storage tank is less than the fourth threshold; among the storage tanks whose liquid temperature is less than the fourth threshold, control the storage tank with the higher heating temperature. The technical solutions provided in this application have the following advantages compared with the prior art: Liquid cooling of the charging pile through the first circulation loop effectively solves the problems of low heat dissipation efficiency, high noise, and susceptibility to dust in traditional air cooling, ensuring that the IGBT power conversion module of the charging pile can maintain a suitable temperature during high-speed charging and avoid derating protection.

[0023] In the first mode, the second circulation loop, through an evaporator heat exchanger, a condenser heat exchanger, a compressor, and a throttling device, heats the liquid in the storage tank using the heat generated during the operation of the charging pile, collected at the cooling tank. This allows for the secondary utilization of waste heat from the charging pile, thereby improving the overall system's energy efficiency and energy efficiency ratio. In other words, by utilizing energy in a tiered manner, the system's overall energy efficiency is improved, and operating costs are reduced.

[0024] A finned heat exchanger is a heat exchanger with a finned structure, typically used for heat exchange with ambient air as an auxiliary heat dissipation or heat source. The second circulation loop is also configured to operate in both second and third modes.

[0025] When the total load at the charging station is low, resulting in less heat generation, and the liquid temperature in the storage tank is low, it may not be able to meet the hot water supply requirements. A second circulation loop can be configured by sequentially energizing the compressor, condenser heat exchanger, pressure throttling device, and finned heat exchanger. This allows the circulating refrigerant to absorb heat from the air through the finned heat exchanger, thereby rapidly heating the liquid in the storage tank and achieving rapid heating and supply of hot water. This method also offers a higher energy efficiency ratio compared to electric heating.

[0026] When the total load at the charging station is high, generating significant heat and requiring rapid heat dissipation, a high liquid level in the storage tank may prevent its use as a cooling source. A second circulation loop can be configured by sequentially energizing the compressor, finned heat exchanger, pressure throttling device, and condenser heat exchanger. This allows the circulating refrigerant to absorb heat from the coolant through the condenser heat exchanger, rapidly cooling the charging station and maintaining a stable, high charging power, thus increasing charging speed. In the second circulation loop, the heat absorbed by the refrigerant can exchange with the flowing air through the finned heat exchanger, achieving similar rapid response and efficient cooling of the coolant and charging station, resulting in a high energy efficiency ratio.

[0027] In other words, by setting different conduction connection methods for the evaporator heat exchanger, condenser heat exchanger and finned heat exchanger in the second circulation loop, the second circulation loop can be flexible between at least the first mode, the second mode and the third mode. While improving the overall energy efficiency of the system, it can meet the requirements of efficient heating and supply of hot water, as well as efficient cooling and response of charging piles. Attached Figure Description The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0030] Figure 1 This application provides a schematic diagram of the connection structure of a heat recovery system for a charging station. Figure 2 This application provides an electrical connection diagram of a heat recovery system for a charging station. Figure 3 A schematic diagram of the connection between a condensing heat exchanger and a third circulation loop is provided in an embodiment of this application; Figure 4 for Figure 1 Another connection structure diagram of the first loop shown; Figure 5 for Figure 1 A schematic diagram of another connection structure for the first loop shown in the figure; Figure 6 A flowchart illustrating a control method for a heat recovery system of a charging station, as provided in an embodiment of this application. Figure 7 A flowchart illustrating the control method of a heat recovery system for a second charging station provided in this application embodiment; Figure 8 A flowchart illustrating the control method of a third type of heat recovery system for a charging station provided in this application embodiment; Figure 9 This is a schematic diagram of the connection structure of the control module of a heat recovery system for a charging station, provided in an embodiment of this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0033] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0034] Please see Figures 1 to 9 This application provides a heat recovery system and control method for a charging station to solve the heat dissipation problem of charging piles during fast charging.

[0035] Firstly, this application provides a heat recovery system 100 for a charging station, such as... Figure 1 As shown, the heat recovery system 100 of the charging station includes a charging pile 10, a first circulation loop 20, a second circulation loop 30, and a liquid storage tank 41.

[0036] like Figure 1 and Figure 4 As shown, the first circulation loop 20 includes a liquid cooler 21, a first circulation pump 22 and a cooling tank 23 connected in sequence. The liquid cooler 21 is located at the charging pile 10. The first circulation pump 22 is used to drive the coolant to circulate between the liquid cooler 21 and the cooling tank 23 so that the liquid cooler 21 cools the charging pile 10.

[0037] The charging pile 10 refers to the equipment for charging electric vehicles, which converts alternating current (AC) to direct current (DC) and replenishes the electric vehicle's battery with higher voltage and current. The charging pile 10 contains power devices such as IGBTs, which generate heat during operation. The cooling tank 23 stores coolant and circulates the coolant, at least under the drive of the first circulation pump 22.

[0038] The liquid cooler 21 can be a sealed housing for housing the power devices of the charging pile 10. The first circulation pump 22 drives the insulating coolant to circulate between the liquid cooler 21 and the cooling tank 23 to cool the power devices immersed in the liquid cooler 21.

[0039] Alternatively, the liquid cooler 21 can also be a heat exchange device with internal flow channels. By attaching the liquid cooler 21 to one or more power devices within the charging pile 10, the coolant can absorb heat from the contacting power devices during the circulation between the cooling tank 23 and the liquid cooler 21, thereby achieving rapid cooling of the power devices. One liquid cooler 21 or at least two liquid coolers 21 can be installed within the same charging pile 10, and the at least two liquid coolers 21 can be connected in parallel or in series; there is no limitation on this.

[0040] like Figure 1 As shown, the second circulation loop 30 includes a compressor 31, an evaporator heat exchanger 32, a condenser heat exchanger 33, a finned heat exchanger 34, and a throttle valve 35. The second circulation loop 30 is configured to connect two of the evaporator heat exchanger 32, the condenser heat exchanger 33, and the finned heat exchanger 34 to the refrigerant circulation. The compressor 31 compresses and drives the refrigerant circulation, and the throttle valve 35 reduces the pressure and temperature of the refrigerant. The evaporator heat exchanger 32 cools the coolant in the cooling tank 23, and the condenser heat exchanger 33 heats the liquid in the storage tank 41.

[0041] In the second circulation loop 30, the refrigerant is a working fluid that transfers heat through phase change. For example, the refrigerant in the second circulation loop 30 can transport the heat from the cooling tank 23 to the liquid storage tank 41 to heat the liquid in the liquid storage tank 41 and realize the secondary utilization of the waste heat of the charging pile 10.

[0042] The compressor 31 is the core component of the heat pump system in the second circulation loop 30, used to compress the refrigerant and increase its output temperature and pressure. The refrigerant compressed by the compressor 31 condenses and releases heat at the condenser heat exchanger 33 to heat the liquid in the receiver tank 41. After the condensed liquid refrigerant flows through the throttle valve 35 to reduce pressure and temperature, it absorbs heat and evaporates in the evaporator heat exchanger 32, thereby cooling the coolant in the cooling tank 23.

[0043] In this way, the charging pile 10 is liquid-cooled through the first circulation loop 20, which effectively solves the problems of low heat dissipation efficiency, high noise, and susceptibility to dust in traditional air cooling, ensuring that the power conversion module IGBT of the charging pile 10 can maintain a suitable temperature during high-speed charging and avoid derating protection.

[0044] In the first mode, the second circulation loop 30, through the evaporator heat exchanger 32, condenser heat exchanger 33, compressor 31, and throttling device 35 connected in the second circulation loop 30, heats the liquid in the storage tank 41 with the heat generated during the operation of the charging pile 10 collected at the cooling tank 23, thereby achieving secondary utilization of waste heat from the charging pile 10 and improving the overall system's energy utilization efficiency and energy efficiency ratio. In other words, through the cascade utilization of energy, it is beneficial to improve the system's overall energy efficiency and reduce operating costs.

[0045] The finned heat exchanger 34 is a heat exchanger with a finned structure, typically used for heat exchange with ambient air as an auxiliary heat dissipation or heat source. This allows the second circulation loop 30 to be configured for operation in both a second and a third mode.

[0046] When the total load at charging station 10 is relatively low, resulting in less heat generation, the liquid temperature in storage tank 41 may be too low to meet the hot water supply requirement. To address this, the compressor 31, condenser heat exchanger 33, pressure throttling device 35, and finned heat exchanger 34 in the second circulation loop 30 can be sequentially activated. This allows the circulating refrigerant to absorb heat from the air through the finned heat exchanger 34, thereby rapidly heating the liquid in storage tank 41 and achieving rapid heating and supply of hot water. This method also boasts a higher energy efficiency ratio compared to electric heating.

[0047] When the total load at charging pile 10 is high, resulting in significant heat generation and requiring rapid heat dissipation, the high liquid level in the storage tank 41 may prevent its use as a cold source. In this case, the compressor 31, finned heat exchanger 34, pressure throttling device 35, and condenser heat exchanger 33 in the second circulation loop 30 can be sequentially connected. This allows the circulating refrigerant to absorb heat from the coolant through the condenser heat exchanger 33, facilitating rapid cooling of the charging pile and enabling charging pile 10 to maintain a stable high charging power, thereby increasing the charging speed. In the second circulation loop 30, the heat absorbed by the refrigerant can exchange with the flowing air through the finned heat exchanger 34, achieving rapid response and efficient cooling of both the coolant and charging pile 10, resulting in a high energy efficiency ratio.

[0048] In other words, by setting different conduction connection methods for the evaporator heat exchanger 32, condenser heat exchanger 33 and finned heat exchanger 34 in the second circulation loop 30, the second circulation loop 30 can be flexible between at least the first mode, the second mode and the third mode. On the basis of improving the overall energy efficiency of the system, it can meet the requirements of efficient heating and supply of hot water, as well as efficient cooling and response of charging piles.

[0049] In the second circulation loop 30, the connection methods corresponding to the mode switching between the evaporator heat exchanger 32, the condenser heat exchanger 33, and the finned heat exchanger 34 can be implemented in various ways. This can be achieved through the coordination of multiple shut-off valves or two-position three-way valves.

[0050] Or, such as Figure 1 As shown, the second circulation loop 30 includes a four-way valve 36 with four ports. The throttle valve 35 includes a first expansion valve 351, a second expansion valve 352, and a third expansion valve 353. The compressor 31 has a return port 311 and an exhaust port 312. The return port 311 is connected to the first port 361 of the four-way valve 36, and the exhaust port 312 is connected to the second port 362 of the four-way valve 36. One end of the finned heat exchanger 34 is connected to the third port 363 of the four-way valve 36, and the other end of the finned heat exchanger 34 is connected sequentially to the second expansion valve 352, the third expansion valve 353, and the evaporator heat exchanger 32, and then to the fourth port 364 of the four-way valve 36. One end of the first expansion valve 351 is connected between the second expansion valve 352 and the third expansion valve 353, and the other end of the first expansion valve 351 is connected to the exhaust port 312 via the condenser heat exchanger 33.

[0051] The first expansion valve 351, the second expansion valve 352, and the third expansion valve 353 of the throttle valve 35 sequentially form three refrigerant branches with the condenser heat exchanger 33, the finned heat exchanger 34, and the evaporator heat exchanger 32. The four-way valve 36 is a reversing valve with four fluid ports. It changes the fluid passage by moving its internal valve core or slider, thereby switching the refrigerant flow direction so that the refrigerant in the second circulation loop 30 can circulate in two of the refrigerant branches to meet the high-efficiency heat exchange requirements under different operating conditions.

[0052] Thus, through the coordinated arrangement of the four-way valve 36 and the three expansion valves, precise control and flexible switching of the refrigerant flow direction can be achieved. This allows the evaporator heat exchanger 32, the condenser heat exchanger 33, and the finned heat exchanger 34 to be flexibly switched between the first mode, the second mode, and the third mode.

[0053] For example, by switching the second circulation loop 30 to the first mode, the cooling and temperature reduction requirements of the charging pile 10 are met, and the hot water preparation requirements of the storage tank 41 are met at the same time, so as to realize the secondary utilization of waste heat at the charging pile 10, thereby improving the energy utilization efficiency and energy efficiency ratio of the overall system.

[0054] By switching the second circulation loop 30 to the second mode, the hot water preparation needs of the storage tank 41 are met, enabling the hot water to be heated and supplied quickly, and achieving a higher energy efficiency ratio compared to electric heating.

[0055] By switching the second circulation loop 30 to the third mode, the cooling requirements of the charging pile 10 are met, achieving rapid response and efficient cooling of the coolant and the charging pile 10, and having a high energy efficiency ratio.

[0056] In some implementations, such as Figure 2 As shown, the heat recovery system 100 of the charging station also includes a control module 51. The compressor 31, the four-way valve 36, the first expansion valve 351, the second expansion valve 352 and the third expansion valve 353 are all electrically connected to the control module 51.

[0057] Control module 51 controls the opening of the first expansion valve 351 and the third expansion valve 353, the connection of the first port 361 and the fourth port 364, the connection of the second port 362 and the third port 363, the closing of the second expansion valve 352, and the starting of the compressor 31 to switch the second circulation loop 30 to the first mode. At this time, the evaporator heat exchanger 32 and the condenser heat exchanger 33 are connected to the refrigerant circulation to cool the coolant in the cooling tank 23, and at the same time, the heat absorbed by the refrigerant at the cooling tank 23 is used to heat the liquid in the storage tank 41.

[0058] The control module 51 controls the opening of the first expansion valve 351 and the second expansion valve 352, the connection between the first port 361 and the third port 363, the connection between the second port 362 and the fourth port 364, the closing of the third expansion valve 353, and the starting of the compressor 31 to switch the second circulation loop 30 to the second mode. At this time, the finned heat exchanger 34 and the condenser heat exchanger 33 are connected to the refrigerant circulation to heat the liquid in the storage tank 41 through air heat exchange, thereby meeting the hot water supply for domestic or industrial use. Furthermore, by absorbing heat from the air through the refrigerant to heat the liquid in the storage tank 41, it also exhibits a high energy efficiency ratio.

[0059] The control module 51 controls the opening of the second expansion valve 352 and the third expansion valve 353, connecting the first port 361 and the third port 363, and connecting the second port 362 and the fourth port 364. The first expansion valve 351 closes, and the compressor 31 starts, switching the second circulation loop 30 to the third mode. At this time, the condenser heat exchanger 33 and the finned heat exchanger 34 are connected to the refrigerant circulation to cool the coolant in the cooling tank 23 through air heat exchange, thereby achieving efficient cooling at the charging pile 10. Furthermore, by absorbing cold air from the refrigerant to cool the coolant in the cooling tank 23, a high energy efficiency ratio is also achieved.

[0060] The control module 51 controls the first expansion valve 351, the second expansion valve 352, the third expansion valve 353, and the compressor 31 to close, thereby switching the second circulation loop 30 to the fourth mode. At this time, the operating power at the charging pile 10 is low, and the coolant temperature is low; the coolant alone is sufficient to meet the low-load operation of the charging pile 10. Simultaneously, the liquid in the storage tank 41 has a higher temperature, eliminating the need for heating by the storage tank 41. By controlling the second circulation loop 30 to stop operating, the refrigerant circulation stops, thereby halting the heat recovery or heat dissipation process, and the system enters a standby or stop state to further reduce energy consumption.

[0061] By introducing a control module 51 and defining multiple operating modes, the control module 51 can intelligently switch the working state of the second loop 30 according to the actual operating needs and environmental conditions of the charging station.

[0062] For example, when the cooling tank 23 needs cooling and the storage tank 41 needs heating, the system can switch to the first mode to efficiently recover the heat generated by the charging pile 10 and use it to heat the storage tank 41. When the storage tank 41 has reached the set temperature, but the cooling tank 23 still needs cooling, the system can switch to the third mode to dissipate heat into the environment, ensuring the stable operation of the charging pile 10. If the temperature of the cooling tank 23 is low and no further cooling is needed, but the storage tank 41 still needs heating, the system can switch to the third mode to absorb heat from the environment through the finned heat exchanger 34, thereby ensuring a stable supply of hot water to the storage tank 41. In addition, the fourth mode allows the system to completely stop operating or enter standby mode when heat recovery and cooling are not required, thereby reducing energy consumption.

[0063] This flexible mode switching mechanism not only ensures effective cooling of the charging pile 10 and prevents overheating, but also maximizes the recovery and utilization of heat energy, and efficiently cools the charging pile 10 or adds liquid storage tank 41 when necessary, significantly improving the operating efficiency, adaptability and energy management capabilities of the entire charging station heat recovery system 100.

[0064] Between the liquid storage tank 41 and the condenser heat exchanger 33, the condenser heat exchanger 33 can be configured as a coil structure, with one condenser heat exchanger 33 installed in each liquid storage tank 41, so that the high-temperature and high-pressure gaseous refrigerant can heat the liquid in the liquid storage tank 41 by condensing and releasing heat when flowing through the coil structure condenser heat exchanger 33.

[0065] Or, such as Figure 1 and Figure 3As shown, the heat recovery system 100 of the charging station includes a second circulation pump 42. The condenser heat exchanger 33 includes a first heat exchange channel 331 and a second heat exchange channel 332, which are isolated from each other and used for heat exchange. The first heat exchange channel 331 is connected between the exhaust port 312 and the first expansion valve 351. The liquid storage tank 41, the second circulation pump 42, and the second heat exchange channel 332 are sequentially circulated and connected.

[0066] The second circulation pump 42 is a device used to drive the liquid to circulate in a specific loop. Its function is to provide circulation power for the liquid in the storage tank 41 so that it can flow through the condenser heat exchanger 33 for heat exchange.

[0067] In this embodiment, the first circulating pump 22, the second circulating pump 42, the third circulating pump 65, and the fourth circulating pump can be centrifugal pumps, positive displacement pumps, or magnetic pumps, etc., and their selection should be determined comprehensively based on factors such as the required flow rate, head, and system resistance to ensure that the liquid can be circulated at a suitable flow rate.

[0068] The condensing heat exchanger 33 has a first heat exchange channel 331 and a second heat exchange channel 332. These two channels are physically isolated from each other, but heat transfer occurs through the heat exchange walls. The first heat exchange channel 331 carries the high-temperature, high-pressure refrigerant from the second circulation loop 30, while the second heat exchange channel 332 carries the liquid from the storage tank 41. This design ensures efficient heat exchange between the refrigerant and the liquid in the storage tank 41, while avoiding direct mixing of the two media, thus guaranteeing the purity and safety of the system. The condensing heat exchanger 33 can adopt a plate heat exchanger, a shell-and-tube heat exchanger, or a shell-and-tube heat exchanger, among which plate heat exchangers are often chosen due to their compact structure and high heat exchange performance.

[0069] Thus, the liquid in the storage tank 41 is drawn out by the second circulation pump 42 and then pumped into the second heat exchange channel 332 of the condenser heat exchanger 33. In the second heat exchange channel 332, the liquid absorbs heat from the refrigerant, and its temperature rises. The heated liquid then returns to the storage tank 41, thereby achieving continuous heating and temperature rise of the liquid in the storage tank 41. This forced circulation method ensures that the liquid in the storage tank 41 is heated uniformly and effectively utilizes the heat generated by the condenser heat exchanger 33.

[0070] The arrangement of the first heat exchange channel 331 and the second heat exchange channel 332 allows the liquid in the storage tank 41 to flow directly into the second heat exchange channel 332 for heating by the refrigerant in the first heat exchange channel 331. This allows the condenser heat exchanger 33 to be positioned closer to the compressor 31, reducing the space between the compressor 31 and the first heat exchange channel 331, thereby reducing refrigerant usage and offering advantages such as energy saving, environmental friendliness, and lower cost.

[0071] In some embodiments, such as Figure 3 As shown, the heat recovery system 100 of the charging station includes a first valve 43, and there are at least two first valves 43 and at least two liquid storage tanks 41. One liquid storage tank 41 and one first valve 43 are connected to form a water storage branch, and at least two water storage branches are arranged in parallel. Figure 2 At least two first valves 43 and the second circulation pump 42 shown are electrically connected to the control module 51.

[0072] For example, there are three first valves 43 and three storage tanks 41, with one storage tank 41 connected to one first valve 43, so as to be configured as three parallel water storage branches.

[0073] The parallel connection of at least two water storage branches means that these branches are independent of each other in the main circulation pipeline. By controlling the opening and closing states of the first valve 43 connected in series, some or all of the liquid storage tanks 41 can be suspended for heating and circulation. For example, the liquid heated by the condenser heat exchanger 33 can be distributed to multiple parallel water storage branches, simultaneously heating multiple liquid storage tanks 41. Alternatively, as needed, the control module 51 can adjust the corresponding first valve 43 to concentrate heat on heating a specific liquid storage tank 41, while the other liquid storage tanks 41 remain in standby or heat preservation states. This parallel structure greatly enhances the system's flexibility and scalability.

[0074] At least two first valves 43 and the second circulation pump 42 are electrically connected to the control module 51, meaning that the control module 51 can remotely and automatically control these components via electrical signals. The control module 51 is the intelligent control center of the system, responsible for receiving sensor signals, executing control logic, and outputting control commands. The control module 51 can precisely control the opening or closing state of each first valve 43, as well as the operating state or speed of the second circulation pump 42, according to preset strategies, real-time temperature data, or user requirements.

[0075] For example, when the liquid temperature in a certain storage tank 41 is lower than a set value, the control module 51 can open the corresponding first valve 43 and start the second circulation pump 42 to introduce the heat generated by the condenser heat exchanger 33 into the storage tank 41 for heating. When the temperature of the storage tank 41 reaches the set value, the corresponding first valve 43 is closed, and heating of other storage tanks 41 is switched on or heating is stopped. This centralized intelligent control ensures the efficient, flexible, and automated operation of the heat recovery system 100.

[0076] Through the above technical solution, the lower-temperature storage tank 41 can be heated preferentially, or some storage tanks 41 can be selectively heated according to the load, thereby optimizing heat distribution and improving heat recovery efficiency. While a lower-temperature storage tank 41 is being heated, other higher-temperature storage tanks 41 can still supply hot water normally, without affecting normal user operation. Furthermore, this parallel structure of multiple storage tanks 41 enhances system reliability. Even if a storage tank 41 or its corresponding first valve 43 requires maintenance or malfunctions, other water storage branches can still operate normally, ensuring the continuity of hot water supply and avoiding the risk of the entire system shutting down due to partial failure.

[0077] like Figure 2 and Figure 3 As shown, a water inlet valve 44 is connected upstream or downstream of the second heat exchange channel 332 via a three-way connector, so as to replenish water to the storage tank 41 used for heating by controlling the water inlet valve 44, and heat the tank at the same time as replenishing water.

[0078] Based on this, such as Figure 2 As shown, the heat recovery system 100 of the charging station includes at least two first temperature sensors 53 and a second temperature sensor 54. At least one first temperature sensor 53 is installed in a liquid storage tank 41 to detect the temperature of the liquid inside the tank. The second temperature sensor 54 is installed in a cooling tank 23 to detect the temperature of the coolant. The first temperature sensors 53 and the second temperature sensor 54 are electrically connected to the control module 51.

[0079] The first temperature sensor 53 and the second temperature sensor 54 can be a thermistor, a thermocouple, or a platinum resistance thermometer. In this embodiment, the electrical connection between the control module 51 and the electrical modules such as the temperature sensors can be achieved using analog signal transmission or digital communication protocols, such as RS485 or CAN bus.

[0080] By setting a second temperature sensor 54 and at least two first temperature sensors 53, the temperature of the coolant in the cooling tank 23 and the liquid temperature in each storage tank 41 can be obtained in real time and accurately. This key temperature data is transmitted to the control module 51 in real time, enabling the control module 51 to accurately grasp the cooling requirements of the charging pile 10 and the heating status of each storage tank 41.

[0081] Based on this real-time and comprehensive temperature information, the control module 51 can intelligently determine and select the optimal operating mode of the second circulation loop 30, flexibly switching the operating state of the second circulation loop 30 between the first, second, third, and fourth modes. This helps improve the efficiency of heat recovery and energy utilization, ensures the stable operation of the charging pile 10, avoids unnecessary energy consumption, and also guarantees the immediate supply and efficient heating of hot water, thereby improving the intelligence level, response speed, and economic benefits of the entire charging station heat recovery system 100.

[0082] In some embodiments, such as Figure 3 As shown, the heat recovery system 100 of the charging station also includes a third circulation loop 60, which includes at least two second valves 611, a water collector 62, a water distributor 63, and a third circulation pump 65. One second valve 611 is connected to a storage tank 41 to form a drainage branch 61, and at least two drainage branches 61 are connected in parallel. The water collector 62, drainage branch 61, and water distributor 63 are connected sequentially. At least two water supply branches 64 are connected in parallel between the water distributor 63 and the water collector 62. The third circulation pump 65 is located at the water distributor 63 or the water collector 62 to drive the liquid to circulate between the drainage branch 61 and the water supply branch 64.

[0083] The multiple drainage branches 61 arranged in parallel can adjust the liquid storage tank 41 connected to the third circulation loop 60 by controlling the opening state of the second valve 611. In this way, the liquid storage tank 41 with the qualified temperature can be supplied with hot water, while the liquid storage tank 41 with the unqualified temperature does not need to be connected to the third circulation loop 60, so as to avoid the liquid storage tank 41 being connected to the third circulation loop 60 during the heating process, thereby affecting the hot water supply.

[0084] The water distributor 63 and the water collector 62 are two similarly shaped structures. The water distributor 63 is used to divide the water flow, and the water collector 62 is used to merge multiple water flows. By setting multiple water branch lines 64 in parallel in the water distributor 63 and the water collector 62, hot water can be directed to different demand locations through different water branch lines 64. One or more faucets or other drain fittings can be connected in series on the water branch lines 64 for easy access to hot water.

[0085] Based on this, a third circulation pump 65 is installed at the confluence of the distributor 63 or the collector 62 so that the third circulation pump 65 can drive the hot water to circulate between the storage tank 41 and the water branch 64, so that hot water can be directly accessed at the faucet and other drain parts, avoiding the accumulation of cold water in the pipes (which is discharged), which is conducive to the conservation and utilization of water resources, and makes it convenient for users to access hot water immediately.

[0086] Based on this, such as Figure 2As shown, a third circulation pump 65 and at least two second valves 611 are electrically connected to the control module 51. This allows the control module 51 to monitor the liquid temperature in the storage tank 41 in real time and adjust the storage tank 41 to meet the requirements for connection to the third circulation loop 60 and supply hot water by controlling the state of the second valves 611.

[0087] Thus, the third circulation loop 60 can effectively collect and flexibly distribute the hot liquid stored in multiple storage tanks 41, solving the problem of hot liquid output and utilization. By setting an independent second valve 611 and a parallel drainage branch 61, hot water can be selectively supplied from different storage tanks 41 according to actual needs, improving the operational flexibility of the system. The combined use of the water collector 62 and the drain ensures smooth distribution and collection of hot water, while the parallel water branch 64 can meet the needs of multiple points using water simultaneously. The introduction of the third circulation pump 65 ensures stable circulation of liquid throughout the loop, thereby ensuring timely supply of hot water. This significantly improves the convenience and effectiveness of the recovered heat energy utilization of the charging station heat recovery system 100, enabling the heated liquid to be more effectively applied to various practical scenarios, thus giving the overall system greater economic benefits and practical value.

[0088] Between the first circulation loop 20 and the second circulation loop 30, the evaporative heat exchanger 32 is a coil structure installed inside the cooling tank 23, which has a simple structure.

[0089] Or, such as Figure 1 As shown, the evaporative heat exchanger 32 includes a third heat exchange channel 321 and a fourth heat exchange channel 322. The third heat exchange channel 321 and the fourth heat exchange channel 322 are isolated from each other and used for heat exchange. The third heat exchange channel 321 is disposed within the second circulation loop 30. The heat recovery system 100 of the charging station includes a fourth circulation pump 52. The fourth heat exchange channel 322 is circulated and connected to the cooling tank 23 via the fourth circulation pump 52.

[0090] Thus, the coolant in cooling tank 23 is drawn out by the fourth circulation pump 52 and then pumped into the fourth heat exchange channel 322 of the cold evaporation heat exchanger 32. In the fourth heat exchange channel 322, the heat of the coolant is absorbed by the refrigerant evaporating in the third heat exchange channel 321, thereby lowering the temperature of the coolant. The cooled coolant then returns to cooling tank 23, so that the coolant in cooling tank 23 is continuously cooled through the second circulation loop 30. This forced circulation method ensures that the coolant in cooling tank 23 can be continuously and uniformly cooled, and the heat lost by the coolant can be used to heat the liquid in storage tank 41 to achieve heat recovery and utilization.

[0091] The arrangement of the third heat exchange channel 321 and the fourth heat exchange channel 322 allows the coolant in the cooling tank 23 to flow directly into the fourth heat exchange channel 322 for cooling by the refrigerant in the third heat exchange channel 321. This allows the evaporator heat exchanger 32 to be positioned closer to the compressor 31, reducing the space between the compressor 31 and the third heat exchange channel 321, thereby reducing refrigerant usage and offering advantages such as energy saving, environmental friendliness, and lower cost.

[0092] In the first loop 20, such as Figure 4 As shown, the first circulation loop 20 includes a distributor 24 and a collector 25. There are at least two liquid coolers 21 and charging stations 10, with one charging station 10 corresponding to one liquid cooler 21. There are at least two first circulation pumps 22, with one liquid cooler 21 connected to one first circulation pump 22 to form a cooling branch. At least two cooling branches are connected in parallel between the distributor 24 and the collector 25, and the distributor 24 and the collector 25 are connected to the cooling tank 23.

[0093] Multiple cooling branches connected in parallel can adjust the liquid cooler 21 connected to the first circulation loop 20 by controlling the starting state of the first circulation pump 22. Thus, when some or all of the charging piles 10 are in the process of fast charging, the corresponding first circulation pump 22 can be started, so that the coolant in the cooling tank 23 flows through the corresponding liquid cooler 21 driven by the first circulation pump 22, thereby cooling down the corresponding charging pile 10.

[0094] The distributor 24 and the collector 25 are two similarly shaped structures. The distributor 24 is used to divide the circulating flow path of the coolant into multiple liquid coolers 21, and the collector 25 is used to converge the flow paths of multiple liquid coolers 21.

[0095] By introducing a distributor 24 and a collector 25, and configuring at least two liquid coolers 21 and at least two first circulation pumps 22, each charging station 10 can have an independent cooling branch. After the coolant flows out of the cooling tank 23, it is evenly distributed to each cooling branch by the distributor 24. The first circulation pump 22 in each branch drives the coolant to flow through the corresponding liquid cooler 21, efficiently absorbing the heat generated by the charging station 10. Subsequently, the coolant is collected in the collector 25 and returned to the cooling tank 23 for heat exchange.

[0096] This distributed, modular cooling design significantly improves the system's cooling efficiency and temperature uniformity, ensuring that each charging pile 10 operates within its optimal temperature range. Simultaneously, because each cooling branch can be independently controlled, the system offers greater flexibility, dynamically adjusting the cooling strategy based on the load of different charging piles 10 to achieve on-demand cooling and effectively save energy. Furthermore, the parallel arrangement of multiple cooling branches provides system redundancy; even if one liquid cooler 21 or the first circulation pump 22 fails, the other branches can still operate normally, greatly improving the system's operational reliability and continuous operation capability, reducing the risk of single-point failures, and simplifying system expansion and maintenance.

[0097] In some other embodiments, such as Figure 5 As shown, the first circulation loop 20 may also include a distributor 24, a collector 25, and a third valve 26. There are at least two liquid coolers 21, with one charging station 10 corresponding to one liquid cooler 21. There are at least two third valves 26, with one liquid cooler 21 connected to one third valve 26 to form a cooling branch. At least two cooling branches are connected in parallel between the distributor 24 and the collector 25, and the distributor 24 and the collector 25 are connected to the cooling tank 23.

[0098] The first circulation pump 22 is connected between the distributor 24 and the cooling tank 23. Alternatively, the first circulation pump 22 can be connected between the collector 25 and the cooling tank 23.

[0099] Thus, by introducing a distributor 24, a collector 25, and at least two parallel cooling branches into the first circulation loop 20, each cooling branch includes a liquid cooler 21 and a third valve 26, and making each charging pile 10 correspond to a liquid cooler 21, the problems of inflexible cooling management, high energy consumption, and inconvenient maintenance in the scenario of multiple charging piles 10 are effectively solved.

[0100] Based on this, the distributor 24 and collector 25 establish a clear coolant distribution and collection path, enabling the coolant to flow efficiently to each independent cooling branch. The third valve 26 installed in each cooling branch allows for independent adjustment or complete isolation of the cooling intensity (i.e., coolant flow rate) of a single charging pile 10.

[0101] For example, when a charging pile 10 is under low load or shut down, the supply of coolant can be reduced or stopped by closing or adjusting its corresponding third valve 26, thereby avoiding unnecessary consumption of cold source.

[0102] Meanwhile, when a liquid cooler 21 needs maintenance or replacement, it can be isolated from the circulation simply by closing its corresponding third valve 26, without interrupting the operation of the entire first circulation loop 20. This ensures the normal cooling of other charging piles 10, greatly improving the system's operational flexibility, reliability, and maintainability. This modular and independently controllable cooling design enables the system to perform precise energy management according to actual needs, reducing operating costs and improving the overall operating efficiency of the charging station.

[0103] For example, such as Figure 2 As shown, the first circulating pump 22 and the third valve 26 are electrically connected to the control module 51 so that the system can flexibly and automatically adjust the operating status of the first circulating loop 20 according to the operating conditions.

[0104] Secondly, embodiments of this application also provide a control method for a heat recovery system of a charging station, used to control the heat recovery system 100 of the charging station in the first aspect. For example... Figure 6 As shown, the control method includes the following steps: Obtain the cooling temperature T1 in the cooling tank 23 and the liquid storage temperature T2 in the liquid storage tank 41.

[0105] Compare whether the cooling temperature T1 and the liquid storage temperature T2 meet the preset threshold.

[0106] If the cooling temperature T1 is greater than or equal to the first threshold K1, and the liquid storage temperature T2 is less than the second threshold K2, the second circulation loop 30 is controlled to execute the first mode.

[0107] If the cooling temperature T1 is greater than or equal to the first threshold K1, and the liquid storage temperature T2 is greater than or equal to the second threshold K2, the second circulation loop 30 is controlled to execute the third mode.

[0108] In the first mode, the evaporator heat exchanger 32 and the condenser heat exchanger 33 are connected to the second circulation loop 30. In the third mode, the evaporator heat exchanger 32 and the finned heat exchanger 34 are connected to the second circulation loop 30.

[0109] For example, a second temperature sensor 54 can be installed in the cooling tank 23 to detect the cooling temperature T1 of the coolant. A first temperature sensor 53 can be installed in the storage tank 41 to detect the storage temperature T2 of the water in the storage tank 41. These temperature sensors transmit the collected temperature data to the control module 51 as a basis for determining the system operating mode.

[0110] The cooling tank 23 is typically set to one, requiring only one second temperature sensor 54 to obtain a cooling temperature T1 parameter. The number of liquid storage tanks 41 can be one, two, three, or more. Taking three liquid storage tanks 41 as an example, by sequentially setting a first temperature sensor 53 in each of the three liquid storage tanks 41, the control module 51 can obtain three liquid storage temperatures, such as T21, T22, and T23.

[0111] Comparing the cooling temperature T1 and the liquid storage temperature T2 to whether they meet the preset thresholds means that after receiving the cooling temperature T1 and liquid storage temperature T2 data, the control module 51 compares them with the preset thresholds. These thresholds are determined based on factors such as system design goals, operating efficiency requirements, and safety constraints, and are used to define different operating conditions. Through comparison, the system can determine the current heat load and heat recovery requirements, thereby selecting the most suitable operating strategy.

[0112] The first threshold K1 is used to determine whether the temperature of the coolant in the cooling tank 23 has reached a high level that requires heat recovery. Its value is set in the range of 45-55℃, meaning that when the coolant temperature reaches this range, the heat generated by the charging pile 10 is sufficient to bring the coolant to a sufficient temperature. If the coolant is not cooled in time, the high temperature of the coolant will not effectively cool the charging pile 10.

[0113] The second threshold K2 is used to determine whether the temperature of the liquid in the storage tank 41 has reached a high usable level. Its value is set within the range of 50-60℃ to ensure that the liquid temperature in the storage tank 41 meets daily hot water needs while avoiding overheating, thereby improving thermal energy utilization efficiency.

[0114] If the cooling temperature T1 is greater than or equal to the first threshold K1, and the liquid storage temperature T2 is less than the second threshold K2 (i.e., T1 ≥ K1 and T2 < K2), then the second circulation loop 30 is controlled to execute the first mode.

[0115] In the case where there are three storage tanks 41, if T1 ≥ K1, and at least one of T21, T22, and T23 is less than the second threshold K2, the second circulation loop 30 is also controlled to execute the first mode. This can be achieved by simply opening the first valve 43 at one or more of the storage tanks 41 with the lower temperature for heating.

[0116] When the temperature of the coolant in the cooling tank 23 is high (reaching or exceeding the first threshold K1, indicating a high demand for heat dissipation in the charging pile 10), and the current temperature of the coolant is no longer sufficient to effectively cool the charging pile 10, it is urgent to cool the coolant through the second circulation loop 30. At the same time, since the temperature of the liquid in the storage tank 41 is low (below the second threshold K2, indicating a heating requirement), the second circulation loop 30 is controlled to enter the first mode.

[0117] In this mode, the heat pump system prioritizes heat recovery, transferring the heat generated by the charging pile 10 to the storage tank 41, achieving efficient energy utilization. In the first mode, the control module 51 configures a second circulation loop 30, allowing the liquid refrigerant to absorb heat through the coolant in the cooling tank 23 within the evaporator heat exchanger 32, while the gaseous refrigerant releases heat to the liquid in the storage tank 41 within the condenser heat exchanger 33, thereby achieving efficient cooling of the cooling tank 23 and the charging pile 10, and efficient heating of the storage tank 41.

[0118] If the cooling temperature T1 is greater than or equal to the first threshold K1, and the liquid storage temperature T2 is greater than or equal to the second threshold K2 (i.e., T1≥K1 and T2≥K2), then the second circulation loop 30 is controlled to execute the third mode.

[0119] In the case where there are three storage tanks 41, if T1≥K1, and T21, T22 and T23 are all greater than or equal to the second threshold K2, the second loop 30 is also controlled to execute the third mode.

[0120] When the coolant temperature in cooling tank 23 is high (reaching or exceeding the first threshold K1) but the liquid temperature in storage tank 41 has reached or exceeded the second threshold K2 (indicating that the hot water demand has been met or storage tank 41 is full), the system cannot continue to rapidly absorb heat from cooling tank 23 through storage tank 41 because the liquid temperature in all storage tanks 41 is in a high range. However, both charging pile 10 and cooling tank 23 still have high heat dissipation requirements.

[0121] At this time, the control second circulation loop 30 enters the third mode. In this mode, the heat generated by the heat pump system charging pile 10 is discharged into the environment through the finned heat exchanger 34 to achieve rapid cooling of the charging pile 10 and the cooling tank 23, and avoid reducing the cooling rate and cooling efficiency through the parameters of the liquid storage tank 41.

[0122] Through the aforementioned control method, the heat recovery system 100 of the charging station can intelligently select the optimal operating mode based on the real-time temperature status of the cooling tank 23 and the storage tank 41. When the charging pile 10 has a high heat dissipation demand and the storage tank 41 needs to be heated, the system can efficiently transfer heat from the cooling tank 23 to the storage tank 41, achieving effective heat recovery and utilization. When the charging pile 10 has a high heat dissipation demand but the storage tank 41 no longer needs heating, the system can promptly discharge excess heat to the environment, ensuring the stable operation of the charging pile 10 and preventing the cooling rate and efficiency from decreasing due to overheating of the storage tank 41. This adaptive mode switching mechanism significantly improves the system's energy utilization efficiency and operational stability, while ensuring the cooling effect of the charging pile 10 and the heating demand of the storage tank 41, achieving a dynamic balance between heat recovery and heat dissipation. In some embodiments, continue to refer to Figure 6 After comparing whether the cooling temperature T1 and the liquid storage temperature T2 meet the preset threshold, the control method further includes the following steps: If the cooling temperature T1 is less than the third threshold K3, and the liquid storage temperature T2 is greater than or equal to the second threshold K2, the second circulation loop 30 is controlled to execute the fourth mode.

[0123] If the cooling temperature T1 is less than the third threshold K3 and the liquid storage temperature T2 is less than the fourth threshold K4, the second circulation loop 30 is controlled to execute the second mode.

[0124] In this mode, the third threshold K3 is less than the first threshold K1, and the fourth threshold K4 is less than the second threshold K2. In the second mode, the finned heat exchanger 34 and the condenser heat exchanger 33 are connected to the second circulation loop 30. In the fourth mode, the compressor 31 and the throttle valve 35 are shut down.

[0125] For example, the third threshold K3 is used to determine whether the temperature of the coolant in the cooling tank 23 is at a low level, at which point active cooling or heat recovery may not be necessary. The value of the third threshold K3 is set in the range of 15-25°C, which helps to avoid unnecessary starting of the compressor 31 when the coolant temperature is low, thereby saving energy.

[0126] The fourth threshold K4 is used to determine whether the temperature of the liquid in the storage tank 41 is at a low level. At this time, the storage tank 41 can efficiently and fully absorb heat for rapid and efficient cooling of the charging pile 10. The value range of the fourth threshold K4 is set between 25-30℃, which helps to promptly activate the heating mode when the liquid temperature in the storage tank 41 is low, ensuring the supply of hot water and efficiently cooling the charging pile 10.

[0127] Based on this, when the control module 51 detects that the cooling temperature T1 in the cooling tank 23 is lower than the preset third threshold K3, it indicates that the heat dissipation requirement of the charging pile 10 is low. The cooling and cooling requirements of the charging pile 10 can be met by the coolant in the cooling tank 23 itself. At this time, there is no need for strong cooling, and it is not conducive to the efficient heat absorption and temperature rise at the liquid storage tank 41.

[0128] Based on this, if the liquid temperature T2 in the storage tank 41 is greater than or equal to the preset second threshold K2, i.e., T2≥K2, it indicates that the liquid temperature in the storage tank 41 is high and no further heating is needed. In this case, the control module 51 will control the second circulation loop 30 to execute the fourth mode, that is, to shut down the compressor 31 and the throttle 35, so that the entire second circulation loop 30 stops operating. This can effectively avoid the system idling or operating inefficiently when there is no actual demand, thereby significantly reducing energy consumption.

[0129] Furthermore, if there is only one storage tank 41, and the storage temperature T2 is greater than or equal to the fourth threshold K4, and the storage temperature T2 is less than the second threshold T2 (i.e., K4≤T2<K2), the control module 51 adjusts the second circulation loop 30 to execute the fourth mode.

[0130] If there are at least two liquid storage tanks 41, such as three liquid storage tanks 41, and all liquid storage temperatures T2 are greater than or equal to the fourth threshold K4, and at least one liquid storage temperature T2 is less than the second threshold K2, or if all liquid storage temperatures T2 are greater than the second threshold K2, the control module 51 adjusts the second circulation loop 30 to execute the fourth mode, that is, shutting down the compressor 31 and the throttle 35, so that the entire second circulation loop 30 stops operating. This effectively avoids the system idling or inefficient operation when there is no actual demand, thereby significantly reducing energy consumption.

[0131] When the liquid temperature T2 in the storage tank 41 is less than the fourth threshold K4. If there is only one storage tank 41, then T2 < K4. If there are three storage tanks 41, it means that at least one storage tank 41 has a liquid temperature T2 less than the fourth threshold K4. At this time, the liquid temperature in some storage tanks 41 is low and needs to be heated. The control module 51 controls the second circulation loop 30 to execute the second mode. This connects the finned heat exchanger 34 and the condenser heat exchanger 33 to the refrigerant circulation, so that the refrigerant absorbs heat from the environment through the finned heat exchanger 34 to heat the lower-temperature storage tanks 41.

[0132] Through the above technical solutions, this application can provide a more refined and flexible operating mode switching strategy based on the actual temperature status of the cooling tank 23 and the liquid storage tank 41. When neither cooling nor heating demand is urgent, the system can intelligently enter the fourth mode, completely stopping the operation of the compressor 31 and the throttle 35, thereby avoiding unnecessary energy consumption and improving the overall energy efficiency of the system. Furthermore, when the cooling demand is low but the liquid storage tank 41 needs heating, the system can switch to the second mode, using the finned heat exchanger 34 to absorb heat from the environment to heat the liquid storage tank 41. This is a highly efficient and energy-saving heating method, especially suitable for scenarios with suitable ambient temperatures and low cooling loads. This intelligent switching of multiple modes allows the heat recovery system 100 of the charging station to better adapt to different operating conditions and environmental conditions, optimizing energy utilization efficiency and extending the service life of the equipment.

[0133] In some embodiments, such as Figure 7 As shown, after comparing whether the cooling temperature T1 and the liquid storage temperature T2 meet the preset thresholds, if the cooling temperature T1 is greater than or equal to the third threshold K3 and the cooling temperature T1 is less than the first threshold K1 (i.e., K3≤T1<K1), the control method includes the following steps: If the liquid storage temperature T2 is greater than or equal to the second threshold K2, and the total load ratio M of the charging pile 10 is greater than or equal to the fifth threshold K5, the second circulation loop 30 is controlled to execute the third mode.

[0134] If the liquid storage temperature T2 is greater than or equal to the fourth threshold K4, and the total load ratio M of the charging pile 10 is less than the fifth threshold K5, the second circulation loop 30 is controlled to execute the fourth mode.

[0135] Among them, the third threshold K3 is less than the first threshold K1, and the fourth threshold K4 is less than the second threshold K2. In the fourth mode, the compressor 31 and the throttle 35 are controlled to close.

[0136] After comparing whether the cooling temperature T1 and the liquid storage temperature T2 meet the preset threshold, the control strategy needs to be further optimized when the cooling temperature T1 is in the middle range (i.e., K3≤T1<K1).

[0137] When the cooling temperature T1 is within the range of K3 ≤ T1 < K1, if the liquid storage temperature T2 is greater than or equal to the second threshold K2, it indicates that the liquid temperature in all liquid storage tanks 41 has reached or is close to the target heating temperature. At this time, the priority of continuing to heat the liquid storage tanks 41 is low, and the liquid storage tanks 41 with higher temperatures cannot quickly absorb the heat from the condenser heat exchanger 33. At the same time, if the total load ratio M of the charging pile 10 is greater than or equal to the fifth threshold K5, for example, the value range of the fifth threshold K5 is 65%~75%, it means that the charging pile 10 is under a high operating load state and will generate more heat, requiring continuous cooling and temperature reduction through the second circulation loop 30.

[0138] In this situation, the control module 51 will control the second circulation loop 30 to execute the third mode. In the third mode, the evaporator heat exchanger 32 and the finned heat exchanger 34 are connected to the second circulation loop 30, so that the evaporator heat exchanger 32 can continuously cool the coolant in the cooling tank 23, while the finned heat exchanger 34 directly discharges heat into the air, thereby prioritizing the cooling needs of the charging pile 10, avoiding the impact of excessively high temperature in the liquid storage tank 41 on cooling efficiency and effect, and ensuring that the charging pile 10 operates continuously and stably within a suitable temperature range.

[0139] On the other hand, when the cooling temperature T1 is in the range K3≤T1<K1, if the liquid storage temperature T2 is greater than or equal to the fourth threshold K4 (e.g., 25-30℃), it indicates that the liquid temperature in all liquid storage tanks 41 is high. Some liquid storage tanks 41 may have a liquid temperature between the fourth threshold K4 and the second threshold K2, meaning that the liquid storage tanks 41 can continue to be heated (with good cooling efficiency) or do not need heating (ensuring some hot water supply). Alternatively, all liquid storage tanks 41 may have a temperature greater than or equal to the second threshold K2, eliminating the need for further heating. In this case, if the total load ratio M of the charging pile 10 is less than the fifth threshold K5, it means that the charging pile 10 generates less heat and has a lower cooling demand. The cooling demand of the charging pile 10 can be ensured by the continuous circulation of the coolant at a lower temperature. In this situation, the control module 51 will control the second circulation loop 30 to execute the fourth mode. In the fourth mode, both the compressor 31 and the throttle 35 are closed, and the entire second circulation loop 30 stops operating. The charging pile 10 can maintain a lower operating temperature by using a coolant with a lower temperature, thus avoiding the continuous operation of the compressor 31 and the second circulation pump 42, thereby significantly reducing energy consumption and improving the overall energy efficiency and operating economy of the system.

[0140] Thus, when the cooling temperature T1 is within a moderate range, and the liquid temperature in the storage tank 41 is already high but the charging pile 10 is under heavy load, the system can intelligently switch to the third mode, prioritizing the cooling needs of the charging pile 10. This involves cooling the cooling tank 23 via the evaporative heat exchanger 32 and dissipating heat using the finned heat exchanger 34, effectively avoiding insufficient cooling due to saturation of the storage tank 41 and ensuring stable operation of the charging pile 10. Conversely, when the cooling temperature T1 is within a moderate range, and the liquid temperature in the storage tank 41 is moderate but the charging pile 10 is under low load, the system switches to the fourth mode, shutting down the compressor 31 and the throttle valve 35, and stopping the operation of the second circulation loop 30. This dynamic adjustment based on the actual load of the charging pile 10 avoids unnecessary operation under low load and low heat generation conditions, significantly reducing system energy consumption and improving energy utilization efficiency. Therefore, the control method of this application can optimize heat recovery efficiency and system operating economy to the maximum extent while ensuring the cooling needs of the charging pile 10 according to actual operating conditions.

[0141] In some embodiments, the number of storage tanks 41 is at least two, and they are arranged in parallel. For example... Figure 7 As shown, when the cooling temperature T1 is greater than or equal to the third threshold K3 and the cooling temperature T1 is less than the first threshold K1, the control method includes the following steps: If the liquid temperature T2 of at least one storage tank 41 is less than the fourth threshold K4, and the total load ratio M of the charging pile 10 is less than the fifth threshold K5, the second circulation loop 30 is controlled to execute the second mode.

[0142] If the liquid temperature T2 of at least one liquid storage tank 41 is less than the second threshold K2, and the total load ratio M of the charging pile 10 is greater than or equal to the fifth threshold K5, the second circulation loop 30 is controlled to execute the first mode.

[0143] In the second mode, the finned heat exchanger 34 and the condenser heat exchanger 33 are connected to the second circulation loop 30.

[0144] When the cooling temperature T1 is in the middle range, if the liquid temperature T2 of at least one storage tank 41 is less than the fourth threshold K4, it indicates that the liquid temperature in at least one storage tank 41 is low and urgently needs to be replenished with heat. Furthermore, if the total load ratio M of the charging pile 10 is less than the fifth threshold K5, it indicates that the overall operating load of the charging pile 10 is low. Given that the coolant temperature is also not high, the waste heat generated by the low-power charging pile 10 is relatively limited and cannot effectively raise the coolant temperature, thus eliminating the need to effectively heat the storage tank 41. At this time, the system switches to the second mode, controlling the finned heat exchanger 34 and the condenser heat exchanger 33 to connect to the second circulation loop 30. The finned heat exchanger 34 absorbs heat from the air and transfers the absorbed heat to the condenser heat exchanger 33 via the second circulation loop to heat the storage tank 41. This ensures that the heating needs of the storage tank 41 are met, especially when the temperature of one of the storage tanks 41 is low.

[0145] On the other hand, when the cooling temperature T1 is in the range of K3 ≤ T1 < K1, if the liquid temperature T2 of at least one storage tank 41 is less than the second threshold K2 (e.g., 50-60℃), it indicates that the liquid temperature in at least one storage tank 41 is lower than the preset higher heating target temperature (second threshold K2), and heating can be performed. Based on this, if the total load ratio M of the charging pile 10 is greater than or equal to the fifth threshold K5 (e.g., 65%~75%), then the charging pile 10 is under a high operating load state and will generate more heat to rapidly heat the coolant in the lower temperature range. At this time, the second circulation loop 30 can be switched to the first mode, i.e., the evaporator heat exchanger 32 and the condenser heat exchanger 33 can be connected to the second circulation loop 30. The waste heat generated by the charging pile 10 is used to heat the liquid in the storage tank 41. Since the charging pile 10 has a high load, indicating abundant waste heat resources, these high-grade waste heat resources are preferentially used to heat the liquid storage tank 41 whose temperature has not reached the standard. This can achieve the maximum efficiency of heat recovery and provide effective cooling for the charging pile 10, thereby significantly improving the overall energy efficiency of the system.

[0146] Through the above technical solution, during the operation of the charging station heat recovery system 100, when the cooling temperature T1 is at a medium level, the system can intelligently select the most suitable heat recovery mode according to the actual temperature status of multiple liquid storage tanks 41 and the real-time load status of the charging pile 10.

[0147] When the temperature of the storage tank 41 is low and the load on the charging pile 10 is not high, the system switches to the second mode, using the finned heat exchanger 34 to absorb heat from the external environment to assist in heating the storage tank 41, ensuring that the low-temperature storage tank 41 can be heated in time, thereby guaranteeing the supply of hot water. Conversely, when the storage tank 41 needs heating and the load on the charging pile 10 is high, the system switches to the first mode, prioritizing the use of the large amount of waste heat generated by the charging pile 10 to heat the storage tank 41, thereby maximizing the recovery and utilization of the waste heat from the charging pile 10, improving overall energy efficiency, and effectively maintaining the temperature of the storage tank 41 within the target range. This refined control strategy enables the system to achieve efficient and flexible heat management under different operating conditions, optimizes heat recovery, and improves the system's adaptability and energy efficiency.

[0148] Thirdly, embodiments of this application provide a control method for a heat recovery system of a charging station, used to control the heat recovery system 100 of the charging station in the first aspect. The number of storage tanks 41 is at least two, and they are arranged in parallel. For example... Figure 8 As shown, the control method includes the following steps: When the second loop 30 is in either the first or second mode.

[0149] Obtain and compare the relationship between the total load ratio M of charging pile 10 and the fifth threshold K5.

[0150] If the total load ratio M of the charging pile 10 is greater than or equal to the fifth threshold K5, control the simultaneous heating of at least two liquid storage tanks 41.

[0151] If the total load ratio M of the charging pile 10 is less than the fifth threshold K5, obtain and determine the relationship between the liquid storage temperature T2 of each liquid storage tank 41 and the fourth threshold K4.

[0152] If the liquid storage temperature T2 of all liquid storage tanks 41 is greater than or equal to the fourth threshold K4, control the heating of the liquid storage tank 41 with the lower liquid storage temperature T2.

[0153] If the liquid storage temperature T2 of at least one storage tank 41 is less than the fourth threshold K4, then among the storage tanks 41 where the liquid storage temperature T2 is less than the fourth threshold K4, the storage tank 41 with the higher heating temperature is controlled.

[0154] Furthermore, through the above technical solution, the heat distribution strategy at the storage tanks 41 can be dynamically adjusted according to the total load ratio M of the charging pile 10 and the storage temperature T2 of each storage tank 41. When the charging pile 10 is under high load, the system can simultaneously heat multiple storage tanks 41 to quickly recover and utilize the waste heat generated by the charging pile 10, significantly improving heat recovery efficiency and hot water supply capacity, and avoiding heat waste.

[0155] When the charging pile 10 is under low load, the system performs refined management based on the actual temperature of the storage tanks 41: If the temperature of all storage tanks 41 is higher than the fourth threshold K4, the storage tanks 41 with lower temperatures are heated first to quickly cool the charging pile 10. If there are storage tanks 41 with temperatures lower than the fourth threshold K4, the storage tanks 41 with relatively higher temperatures are selected for heating. Since the lower-temperature storage tanks 41 can all provide rapid cooling for the charging pile 10, selecting the higher-temperature storage tanks allows them to be quickly heated to a higher temperature, ensuring an immediate supply of hot water. This ensures both a continuous and stable supply of hot water and rapid and effective cooling of the charging pile 10, guaranteeing optimal system performance under different operating conditions.

[0156] Fourthly, such as Figure 9 As shown in the figure, this application embodiment provides a control device for a heat recovery system of a charging station, namely a control module 51. The control module includes a processor 511, a communication interface 512, a memory 513, and a communication bus 514. The processor 511, communication interface 512, and memory 513 communicate with each other via the communication bus 514. The memory 513 is used to store computer programs.

[0157] In one embodiment of this application, when the processor 511 executes the computer program stored in the memory 513, it implements the execution steps of the control method for the heat recovery system of the charging station in the second and / or third aspects.

[0158] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the execution steps of the control method for the heat recovery system of the charging station in the second and / or third aspects.

[0159] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0160] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0161] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat recovery system for a charging station, characterized in that, include: Charging stations; Storage tank; The first circulation loop includes a liquid cooler, a first circulation pump, and a cooling tank connected in sequence. The liquid cooler is located at the charging pile. The first circulation pump is used to drive the coolant to circulate between the liquid cooler and the cooling tank so that the liquid cooler cools the charging pile. And a second circulation loop, the second circulation loop including a compressor, an evaporator heat exchanger, a condenser heat exchanger, a finned heat exchanger and a throttle valve; the second circulation loop is configured to connect two of the evaporator heat exchanger, the condenser heat exchanger and the finned heat exchanger to the refrigerant circulation, the compressor is used to compress and drive the refrigerant circulation, and the throttle valve is used to reduce the pressure and temperature of the refrigerant; The evaporative heat exchanger is used to cool the coolant in the cooling tank, and the condensative heat exchanger is used to heat the liquid in the storage tank.

2. The heat recovery system for a charging station according to claim 1, characterized in that, The second circulation loop includes a four-way valve having four ports; the throttle includes a first expansion valve, a second expansion valve, and a third expansion valve. The compressor has a return port and an exhaust port. The return port is connected to the first port of the four-way valve, and the exhaust port is connected to the second port of the four-way valve. One end of the finned heat exchanger is connected to the third port of the four-way valve, and the other end of the finned heat exchanger is connected to the fourth port of the four-way valve in sequence via the second expansion valve, the third expansion valve, and the evaporative heat exchanger. One end of the first expansion valve is connected between the second expansion valve and the third expansion valve, and the other end of the first expansion valve is connected to the exhaust port via the condenser heat exchanger.

3. The heat recovery system for a charging station according to claim 2, characterized in that, The heat recovery system of the charging station also includes a control module, and the compressor, the four-way valve, the first expansion valve, the second expansion valve and the third expansion valve are all electrically connected to the control module; The control module controls the opening of the first expansion valve and the third expansion valve, the connection between the first port and the fourth port, the connection between the second port and the third port, the closing of the second expansion valve and the starting of the compressor, so as to switch the second circulation loop to the first mode; The control module controls the opening of the first expansion valve and the second expansion valve, the first port and the third port are connected, the second port and the fourth port are connected, the third expansion valve is closed and the compressor is started, so as to switch the second circulation loop to the second mode; The control module controls the second expansion valve and the third expansion valve to open, the first port and the third port to be connected, the second port and the fourth port to be connected, the first expansion valve to be closed and the compressor to be started, so as to switch the second circulation loop to the third mode; The control module controls the first expansion valve, the second expansion valve, the third expansion valve, and the compressor to shut down, thereby switching the second circulation loop to the fourth mode.

4. The heat recovery system for a charging station according to claim 3, characterized in that, The heat recovery system of the charging station includes a second circulation pump; The condenser heat exchanger includes a first heat exchange channel and a second heat exchange channel, which are isolated from each other and used for heat exchange; the first heat exchange channel is connected between the exhaust port and the first expansion valve; the liquid storage tank, the second circulation pump and the second heat exchange channel are sequentially circulated and connected.

5. The heat recovery system for a charging station according to claim 4, characterized in that, The heat recovery system of the charging station includes a first valve, and the number of the first valve and the liquid storage tank is at least two. One of the liquid storage tanks and one of the first valves are connected to form a water storage branch, at least two of the water storage branches are connected in parallel, and at least two of the first valves and the second circulation pump are electrically connected to the control module.

6. The heat recovery system for a charging station according to claim 5, characterized in that, The heat recovery system of the charging station includes a third circulation loop, which includes: At least two second valves, one of which is connected to one of the liquid storage tanks to form a drainage branch, and at least two drainage branches are arranged in parallel; Water collector; The water distributor, the water collector, the drainage branch and the water distributor are connected in sequence; At least two water supply branches are connected in parallel between the water distributor and the water collector; A third circulation pump, located at the water distributor or the water collector, is used to drive the liquid to circulate between the drainage branch and the water supply branch.

7. The heat recovery system for a charging station according to claim 5, characterized in that, The heat recovery system of the charging station includes: At least two first temperature sensors are provided, and at least one first temperature sensor is provided in one of the liquid storage tanks for detecting the liquid temperature in the liquid storage tank; A second temperature sensor is disposed inside the cooling tank to detect the temperature of the coolant; the first temperature sensor and the second temperature sensor are electrically connected to the control module.

8. The heat recovery system for a charging station according to any one of claims 1-7, characterized in that, The first circulation loop includes a distributor and a collector; The number of liquid coolers and charging piles is at least two, with one charging pile corresponding to one liquid cooler; The number of the first circulation pumps is at least two, one of the liquid coolers is connected to one of the first circulation pumps to form a cooling branch, and at least two of the cooling branches are connected in parallel between the distributor and the collector, and the distributor and the collector are connected to the cooling tank.

9. The heat recovery system for a charging station according to any one of claims 1-7, characterized in that, The first circulation loop includes a distributor, a collector, and a third valve; The number of liquid coolers and charging piles is at least two, with one charging pile corresponding to one liquid cooler; The number of the third valve is at least two, one of the liquid coolers is connected to one of the third valves to form a cooling branch, and at least two of the cooling branches are connected in parallel between the distributor and the collector, and the distributor and the collector are connected to the cooling tank. The first circulation pump is connected between the distributor and the cooling tank; or, The first circulating pump is connected between the liquid collector and the cooling tank.

10. The heat recovery system for a charging station according to any one of claims 1-7, characterized in that, The evaporative heat exchanger is a coil structure installed inside the cooling tank; or... The evaporative heat exchanger includes a third heat exchange channel and a fourth heat exchange channel, which are isolated from each other and used for heat exchange. The third heat exchange channel is located in the second circulation loop. The heat recovery system of the charging station includes a fourth circulation pump, and the fourth heat exchange channel is circulatedly connected to the cooling tank via the fourth circulation pump.

11. A control method for a heat recovery system of a charging station, used to control the heat recovery system of a charging station as described in any one of claims 1-10, characterized in that, The control method includes: Obtain the cooling temperature in the cooling tank and the liquid storage temperature in the storage tank; Compare whether the cooling temperature and the liquid storage temperature meet a preset threshold. If the cooling temperature is greater than or equal to the first threshold and the liquid storage temperature is less than the second threshold, the second circulation loop is controlled to execute the first mode; If the cooling temperature is greater than or equal to the first threshold, and the liquid storage temperature is greater than or equal to the second threshold, the second circulation loop is controlled to execute the third mode; In the first mode, the evaporator heat exchanger and the condenser heat exchanger are connected to the second circulation loop; in the third mode, the evaporator heat exchanger and the finned heat exchanger are connected to the second circulation loop.

12. The control method for the heat recovery system of the charging station according to claim 11, characterized in that, After comparing whether the cooling temperature and the liquid storage temperature meet a preset threshold, the control method includes: If the cooling temperature is less than the third threshold and the liquid storage temperature is greater than or equal to the second threshold, the second circulation loop is controlled to execute the fourth mode. If the cooling temperature is less than the third threshold and the liquid storage temperature is less than the fourth threshold, the second circulation loop is controlled to execute the second mode. Wherein, the third threshold is less than the first threshold, and the fourth threshold is less than the second threshold; in the second mode, the finned heat exchanger and the condenser heat exchanger are controlled to be connected to the second circulation loop; in the fourth mode, the compressor and the throttle are controlled to be shut down.

13. The control method for the heat recovery system of the charging station according to claim 12, characterized in that, The number of the liquid storage tanks is at least two, and they are connected in parallel. After comparing whether the cooling temperature and the liquid storage temperature meet a preset threshold, the control method includes: When the cooling temperature is less than the third threshold; If the temperature of the liquid in at least one of the liquid storage tanks is less than the fourth threshold, the second circulation loop is controlled to execute the second mode; If all of the liquid storage temperatures are greater than or equal to the fourth threshold, and at least one of the liquid storage temperatures is less than the second threshold, the second circulation loop is controlled to execute the fourth mode.

14. The control method for the heat recovery system of the charging station according to claim 13, characterized in that, The first threshold value ranges from 45-55℃, and the third threshold value ranges from 15-25℃; and / or, The second threshold value ranges from 50 to 60°C, and the fourth threshold value ranges from 25 to 30°C.

15. The control method for the heat recovery system of the charging station according to any one of claims 11-14, characterized in that, After comparing whether the cooling temperature and the liquid storage temperature meet preset thresholds, if the cooling temperature is greater than or equal to a third threshold and the cooling temperature is less than a first threshold, the control method includes: If the temperature of the stored liquid is greater than or equal to the second threshold, and the total load ratio of the charging pile is greater than or equal to the fifth threshold, the second circulation loop is controlled to execute the third mode; If the temperature of the stored liquid is greater than or equal to the fourth threshold, and the total load ratio of the charging pile is less than the fifth threshold, the second circulation loop is controlled to execute the fourth mode. Wherein, the third threshold is less than the first threshold, and the fourth threshold is less than the second threshold; in the fourth mode, the compressor and the throttle are controlled to be turned off.

16. The control method for the heat recovery system of a charging station according to claim 15, characterized in that, The number of the liquid storage tanks is at least two, and they are connected in parallel. When the cooling temperature is greater than or equal to a third threshold and the cooling temperature is less than a first threshold, the control method includes: If the temperature of the liquid in at least one of the liquid storage tanks is less than the fourth threshold, and the total load ratio of the charging pile is less than the fifth threshold, the second circulation loop is controlled to execute the second mode. If the temperature of the liquid in at least one of the liquid storage tanks is less than the second threshold, and the total load ratio of the charging pile is greater than or equal to the fifth threshold, the second circulation loop is controlled to execute the first mode; In the second mode, the finned heat exchanger and the condenser heat exchanger are connected to the second circulation loop.

17. A control method for a heat recovery system of a charging station, used to control the heat recovery system of a charging station as described in any one of claims 1-10, characterized in that, The number of the liquid storage tanks is at least two and they are arranged in parallel. The control method includes: When the second loop is in either the first or second mode; Obtain and compare the relationship between the total load ratio of the charging pile and the fifth threshold; If the total load ratio of the charging pile is greater than or equal to the fifth threshold, control the simultaneous heating of at least two of the liquid storage tanks; If the total load ratio of the charging pile is less than the fifth threshold, obtain and determine the relationship between the liquid storage temperature of each liquid storage tank and the fourth threshold; If the liquid temperature of all the liquid storage tanks is greater than or equal to the fourth threshold, control the heating of the liquid storage tank with the lower liquid temperature; If the liquid temperature of at least one of the liquid storage tanks is less than the fourth threshold; among the liquid storage tanks whose liquid temperature is less than the fourth threshold, the liquid storage tank with the higher heating temperature is controlled.

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