Water source heat pump type energy storage heat management system

Abstract

The invention relates to a water source heat pump type energy storage heat management system, which belongs to the technical field of new energy batteries, and comprises a battery temperature control circulating unit, a heat pump circulating unit, an underground water source conveying unit and a first heat exchange device, the battery temperature control circulating unit is used for circulating the first working medium, so that the first working medium firstly exchanges heat with the battery energy storage system and then exchanges heat with the second working medium; the heat pump circulating unit is used for circulating a second working medium, so that the second working medium firstly exchanges heat with underground water and then exchanges heat with the first working medium; the underground water source conveying unit is used for conveying underground water to the battery temperature control circulating unit, and the underground water exchanges heat with the first working medium and exchanges heat with the second working medium. The method has the effect of improving the temperature control capability and the energy efficiency under different environmental conditions.

Description

Technical Field

[0001] This application relates to the field of new energy battery technology, and in particular to a water source heat pump type energy storage thermal management system. Background Technology

[0002] As the global energy structure transitions towards a low-carbon model, the installed capacity of fluctuating renewable energy sources such as wind power and solar power is growing rapidly. Due to the intermittent and unpredictable nature of these energy sources, the power grid needs to flexibly adjust resources to achieve real-time power balance. Electrochemical energy storage systems, with their advantages of fast response, high adjustment precision, and modular deployment, have become a key technology supporting the grid connection of new energy sources and ensuring the stable operation of the power grid. With the continuous expansion of energy storage scale and the further increase in the capacity of energy storage containers, their thermal management systems face new challenges in terms of high heat flux density, large capacity, and high reliability.

[0003] Existing energy storage thermal management systems mostly use liquid-cooled units for cooling and PTC heaters for heating. However, the cooling capacity of liquid-cooled units is limited as the container capacity increases; PTC heating has low energy efficiency; and the heat dissipation of the liquid-cooled unit condenser and PCS is usually directly discharged into the air, which can easily lead to an increase in the local ambient temperature of the energy storage power station, further affecting the system efficiency.

[0004] To address the aforementioned issues, publication number CN114361699A proposes a containerized energy storage environmental management system. This system utilizes ground source heat pump technology to configure the battery-side liquid cooling circuit, liquid cooling unit, and buried pipe heat exchanger into multiple switchable operating conditions: In spring and autumn or when the underground temperature is suitable, the battery liquid cooling medium can directly exchange heat with the buried pipe heat exchanger to achieve energy-saving operation; when the ambient temperature is too high or too low and cannot meet the heat exchange requirements, the liquid cooling unit is switched into the system through a three-way reversing valve to achieve cooling or heating, and works in conjunction with the buried pipe heat exchanger to regulate the battery temperature.

[0005] Although the above solution can save energy by utilizing underground heat and cold sources, the following problems still exist: The battery's liquid cooling medium flows directly into the buried pipe heat exchange system. The underground environment is complex; if the buried pipe leaks, the battery's liquid cooling medium will be lost, leading to the failure of the battery thermal management system and insufficient system reliability. When the groundwater has poor flow, the heat exchange effect between the battery cooling medium and the underground medium is unstable. If surface water is used, its temperature does not meet the heat exchange conditions, and its flow will also be poor, making it difficult for the system to achieve the expected cooling / heating capacity under energy-saving conditions. When switching between cooling and heating modes, the liquid cooling medium is split into two circulation loops, exchanging heat with the evaporator / battery side and the condenser / buried pipe side, respectively. This structure is prone to pressure fluctuations and uneven flow distribution during the switching process, thus requiring additional components such as buffer tanks and pressure stabilizing devices. This results in an increase in the number of system piping nodes, valves, and control strategies, thereby increasing system cost and failure rate. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a water source heat pump type energy storage thermal management system.

[0007] The water source heat pump type energy storage thermal management system provided in this application adopts the following technical solution: A water source heat pump type energy storage thermal management system includes a battery temperature control circulation unit, a heat pump circulation unit, an underground water source transportation unit, and a first heat exchange device; The battery temperature control circulation unit is used to circulate the first working medium, so that the first working medium first exchanges heat with the battery energy storage system, and then exchanges heat with the second working medium of the heat pump circulation unit through the first heat exchange device. The heat pump circulation unit is used to circulate the second working medium, so that the second working medium first exchanges heat with the water source provided by the underground water source transportation unit, and then exchanges heat with the first working medium through the first heat exchange device; The underground water source delivery unit is used to deliver water to the battery temperature control circulation unit. The water source exchanges heat with the first working medium through the first heat exchange device. It is also used to deliver water to the heat pump circulation unit for heat exchange with the second working medium.

[0008] By adopting the above technical solution, when the ambient temperature is high, the heat pump circulation unit and the water source delivery unit work together. The groundwater first absorbs the condensation heat of the second working medium in the heat pump circulation unit, so that the second working medium can be liquefied smoothly, and then enters the first heat exchange device to absorb the heat of the first working medium. At the same time, the groundwater also further removes heat in the first heat exchange device, thereby enhancing the cooling effect of the first working medium and improving the cooling capacity under high temperature conditions. Under suitable ambient temperature conditions, the heat pump circulation unit can be stopped, and the cooling demand can be met by directly exchanging heat with the first working medium through groundwater, thereby reducing energy consumption and achieving energy-saving operation. Under low-temperature conditions, groundwater can be used to directly heat the first working medium, thereby increasing its temperature and heating the battery energy storage system. In extremely cold environments, the heat pump circulation unit and the underground water supply unit work together. The second working medium first absorbs heat from the underground water and vaporizes, then releases heat to the first working medium in the first heat exchange device. At the same time, the first working medium can also directly absorb heat from the underground water, thereby effectively improving the heating capacity under extremely cold conditions. This improves the temperature control capability and energy efficiency under different environmental conditions.

[0009] The first working medium, the second working medium, and the groundwater each form an independent circuit. The battery liquid cooling circuit is not directly connected to the underground heat exchange system to avoid contamination of the battery module circulating fluid or leakage of the circulating fluid due to damage to the buried pipe. When the underground water circuit leaks or needs maintenance, an external water source can be temporarily introduced to supply the first heat exchange device and the heat pump circulation unit. The battery temperature control circulation unit can still maintain normal operation, thereby reducing system downtime and improving the overall reliability of the system.

[0010] Groundwater is continuously extracted and kept flowing by the water source delivery unit, and the flow rate and temperature are more controllable, thereby making the heat exchange process with the first and second working media more stable and improving the heat exchange consistency of the system under different seasons or environmental conditions.

[0011] Each fluid loop operates independently, and there is no need to split or merge the same loop when switching operating conditions. Therefore, there are no issues such as pressure fluctuations, uneven flow distribution, or unstable gas-liquid mixing. As a result, the system does not require additional components such as buffer tanks or pressure stabilizing devices, reducing the number of pipeline nodes and valves, simplifying the system structure, making the control strategy easier to implement, and lowering the potential failure rate.

[0012] Optionally, the first heat exchange device includes a three-way heat exchanger, and each channel of the three-way heat exchanger is connected to the battery temperature control circulation unit, the heat pump circulation unit and the underground water source delivery unit, respectively.

[0013] By adopting the above technical solution, the first heat exchange device achieves centralized heat exchange coupling between the battery temperature control circulation unit, the heat pump circulation unit, and the water supply unit through a three-way heat exchanger, enabling the three working media to transfer heat within the same heat exchanger according to different operating conditions. Compared with the method of distributing multiple heat exchangers, the three-way heat exchanger can reduce the number of heat exchangers, reduce the number of pipeline connection nodes, and reduce the installation space occupation.

[0014] Optionally, the heat pump circulation unit includes a second heat exchange device, a throttling element, a pressurizing element, and a regulating valve. The second heat exchange device and the first heat exchange device are both connected to the throttling element, and the first heat exchange device and the second heat exchange device are both connected to the pressurizing element. The underground water source delivery unit delivers water to the second heat exchange device. The pressurizing element is used to pressurize the second working medium, so that the second working medium circulates in the circuit including the second heat exchange device, the throttling element, the first heat exchange device and the regulating valve; The throttling element is used to reduce the pressure of the second working medium; The regulating valve is used to control the flow direction of the second working medium.

[0015] By adopting the above technical solution, when cooling the first working medium: The pressurizing element pressurizes the second working medium, placing it under high pressure and increasing its condensation temperature. The second working medium then enters the second heat exchanger to release heat and condense. The groundwater absorbs this released heat in the second heat exchanger, causing the second working medium to condense into a liquid state.

[0016] When the condensed second working medium flows through the throttling element, it experiences throttling and pressure reduction, resulting in a decrease in pressure and saturation temperature, forming low-pressure, low-temperature wet steam. This low-pressure second working medium enters the first heat exchanger, where it evaporates and absorbs heat from the first working medium, cooling the first working medium while simultaneously vaporizing the second working medium. Afterward, the vaporized second working medium re-enters the pressurizing element via the regulating valve, completing the cycle.

[0017] When heating the first working medium: The regulating valve changes the flow direction of the second working medium in the heat pump cycle, causing it to be pressurized and first enter the first heat exchange device to release heat and condense. At this time, the first working medium absorbs the condensation heat released by the second working medium, thus achieving heating, and the second working medium condenses into a liquid state.

[0018] The condensed second working medium flows through a throttling element, where it experiences pressure reduction and a drop in saturation temperature. After entering the low-pressure zone, it then enters the second heat exchanger, where it absorbs heat from the groundwater and vaporizes. The vaporized second working medium re-enters the pressurizing element, increasing its temperature and condensation point, thus continuing the cycle.

[0019] Optionally, the second heat exchange device is a two-way heat exchanger, the throttling element is an expansion valve, and the pressurizing element is a compressor.

[0020] Optionally, the underground water source delivery unit includes a first pump body, which is used to deliver water to the first heat exchange device, and the first pump body is also used to deliver water to the second heat exchange device.

[0021] Optionally, the regulating valve is an eight-way reversing valve, which is connected to the output and input ends of the pressurizing element, one end of the second heat exchanger that delivers water, one end of the second heat exchanger that delivers the second working medium, the input end of the first pump body, and one end of the first heat exchanger that outputs water. The regulating valve is also used to discharge water that has passed through the first heat exchanger.

[0022] By adopting the above technical solution, the eight-way directional valve can still ensure that groundwater continues to flow to the relevant heat exchange devices through the valve even when the circulation path of the second working medium is changed or the passage of the second working medium is temporarily closed. No abnormal situations such as water circuit interruption, sudden pressure changes, or localized water shortages will occur (even if such situations occur, they are controlled by only one valve body, and the groundwater will quickly stabilize under high flow rates, so the adverse effects can be almost ignored). This reduces the complexity of the control strategy and improves the stability of operating condition switching.

[0023] Optionally, the battery temperature control circulation unit includes a second pump body and a third pump body. The second pump body is used to circulate the first working medium, so that the first working medium first exchanges heat with the battery module, and then exchanges heat with the second working medium of the heat pump circulation unit through the first heat exchange device. The third pump body is used to circulate the first working medium, so that the first working medium first exchanges heat with the PCS, and then exchanges heat with the second working medium of the heat pump circulation unit through the first heat exchange device.

[0024] Optionally, the second pump body is connected to the battery module, the first working medium discharge end of the battery module is connected to the third pump body, the third pump body is connected to the PCS, the first working medium discharge end of the PCS is connected to the first working medium inlet end of the first heat exchange device, and the first working medium discharge end of the first heat exchange device is connected to the second pump body.

[0025] By adopting the above technical solution, the first working medium flows sequentially through the battery module and the PCS, forming a series heat exchange structure. The PCS has a high operating temperature tolerance, allowing the use of the heated first working medium for heat exchange without affecting its normal operation. After the battery module absorbs heat and heats up, the first working medium still has usable heat exchange capacity and continues to flow to the PCS for heat exchange, improving overall energy efficiency.

[0026] Optionally, the water source input to the first heat exchanger from the groundwater source delivery unit is groundwater, and the water source discharged from the first heat exchanger is used for domestic / industrial water use.

[0027] By adopting the above technical solutions, the temperature of the groundwater after heat exchange has been increased (or decreased), and it is a water source of reusable temperature level that can be directly used for domestic or industrial water use, realizing waste heat recovery and improving energy utilization efficiency.

[0028] Optionally, the second pump body is an electric water pump, and the third pump body is a centrifugal pump.

[0029] By adopting the above technical solutions, the electronic water pump meets the precise temperature control requirements of the battery module, accurately controlling the flow rate of the first working medium and improving the accuracy and consistency of battery temperature control. Using a centrifugal pump in the PCS (Polymer Packet System) is also beneficial, as the PCS has much lower temperature control accuracy requirements than the battery, but it dissipates heat significantly and requires continuous, high-flow-rate circulation, making the system more economical.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. Improved temperature control capability and energy efficiency under different environmental conditions. When the groundwater temperature is suitable, the first working medium can directly interact with the groundwater to achieve energy-saving operation. When the ambient temperature is high or low and cannot meet the heat exchange requirements, the heat pump circulation unit uses the second working medium to exchange heat with the first working medium. At the same time, the groundwater continuously exchanges heat with the first working medium to achieve cooling or heating and improve temperature control capability. 2. The first working medium, the second working medium, and the groundwater each form an independent circuit. The battery liquid cooling circuit is not directly connected to the underground heat exchange system to avoid contamination of the battery module circulating fluid or leakage of the circulating fluid due to damage to the buried pipe. 3. When the groundwater circuit leaks or needs maintenance, an external water source can be temporarily introduced to supply the first heat exchange device and the heat pump circulation unit. The battery temperature control circulation unit can still maintain normal operation, thereby reducing system downtime and improving the overall reliability of the system. 4. Groundwater is continuously extracted and kept flowing by the water source transportation unit, and the flow rate and temperature are more controllable, thereby making the heat exchange process with the first working medium and the second working medium more stable and improving the heat exchange consistency of the system under different seasons or environmental conditions. 5. Each fluid loop operates independently, and there is no need to split or merge the same loop when switching operating conditions. Therefore, there will be no pressure fluctuations, uneven flow distribution, or unstable gas-liquid mixing. As a result, the system does not require additional components such as buffer tanks or pressure stabilizing devices, reducing the number of pipeline nodes and valves, simplifying the system structure, making the control strategy easier to implement, and reducing the potential failure rate. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0032] Figure 2 This is a schematic diagram of Embodiment 1 of this application used to illustrate the cooling of the first working medium at high temperatures.

[0033] Figure 3 This is a schematic diagram illustrating the structure of the first working medium for refrigeration at room temperature, as described in the embodiments of this application.

[0034] Figure 4 This is a schematic diagram illustrating the structure of the first working medium for heating at low temperatures, as described in the embodiments of this application.

[0035] Figure 5 This is a schematic diagram illustrating the structure of the first working medium for heating under extremely cold conditions, as described in the embodiments of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Battery temperature control circulation unit; 11. Second pump body; 12. Third pump body; 13. Battery module; 14. PCS; 2. Heat pump circulation unit; 21. Second heat exchange device; 22. Throttling element; 23. Pressurizing element; 24. Regulating valve; 3. Groundwater source delivery unit; 31. First pump body; 4. First heat exchange device. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a water source heat pump type energy storage thermal management system.

[0039] like Figure 1 The water source heat pump type energy storage thermal management system includes a battery temperature control circulation unit 1, a heat pump circulation unit 2, an underground water source transportation unit 3, and a first heat exchange device 4. The battery temperature control circulation unit 1 is used to circulate the first working medium, so that the first working medium first exchanges heat with the battery energy storage system, and then exchanges heat with the second working medium of the heat pump circulation unit 2 through the first heat exchange device 4. The first heat exchange device 4 can be integrated into the battery energy storage system or can be independent of the battery energy storage system. The battery temperature control circulation unit 1 is integrated into the battery energy storage system. The battery temperature control circulation unit 1 is connected to one of the first heat exchangers to form a circulation loop for the first working medium. The first working medium can be an aqueous solution of ethylene glycol / an aqueous solution of propylene glycol / pure water / electrically insulating liquid, etc.

[0040] The heat pump circulation unit 2 is used to circulate the second working medium, so that the second working medium first exchanges heat with the groundwater provided by the groundwater source transportation unit 3, and then exchanges heat with the first working medium through the first heat exchange device 4. The heat pump circulation unit 2 can be integrated into the battery energy storage system, or it can be independent of the battery energy storage system. The heat pump circulation unit 2 is connected to another path of the first heat exchange device 4 to form a circulation loop of the second working medium. The second working medium can be a Freon / HFO mixed refrigerant / HFO-HFC mixed refrigerant.

[0041] The groundwater source transportation unit 3 is used to transport groundwater to the battery temperature control circulation unit 1. The groundwater exchanges heat with the first working medium through the first heat exchange device 4. It is also used to transport groundwater to the heat pump circulation unit 2 to exchange heat with the second working medium.

[0042] The groundwater source delivery unit 3 is connected to another path of the first heat exchange device 4, enabling groundwater to be delivered to the first heat exchange device 4 for heat exchange. The discharged groundwater is then used for domestic / industrial water use, etc. That is, the first working medium, the second working medium, and the groundwater form three independent flow paths.

[0043] When the ambient temperature is high, the heat pump circulation unit 2 and the water source delivery unit work together. The groundwater first absorbs the condensation heat of the second working medium, so that the second working medium can be liquefied smoothly. The second working medium then enters the first heat exchange device 4 to absorb the heat of the first working medium. At the same time, the groundwater also further carries away the heat of the first working medium in the first heat exchange device 4. Under suitable ambient temperature conditions, heat pump circulation unit 2 can be stopped, and the cooling demand can be met by directly exchanging heat with the first working medium through groundwater, thereby reducing energy consumption and achieving energy-saving operation. Under low-temperature conditions, groundwater can be used to directly heat the first working medium, thereby increasing its temperature and heating the battery energy storage system. In extremely cold environments, the heat pump circulation unit 2 and the underground water source delivery unit 3 work together. The second working medium first absorbs heat from the groundwater and vaporizes, and then enters the first heat exchange device 4 to release heat to the first working medium. At the same time, the first working medium can also directly absorb heat from the groundwater in the first heat exchange device 4.

[0044] The first heat exchange device 4 includes a three-way heat exchanger, more specifically a three-way two-phase heat exchanger, with each channel of the three-way heat exchanger connected to the battery temperature control circulation unit 1, the heat pump circulation unit 2, and the underground water supply unit 3, respectively. In other embodiments, the first heat exchange device 4 may also employ two two-way two-phase heat exchangers, i.e., one channel of one two-way two-phase heat exchanger is connected to the battery temperature control circulation unit 1, and the other channel is connected to the heat pump circulation unit 2; while one channel of the other two-way two-phase heat exchanger is connected to the battery temperature control circulation unit 1, and the other channel is connected to the underground water supply unit 3, allowing the two two-way two-phase heat exchangers to be connected in series in the circulation loop of the first working medium.

[0045] The heat pump circulation unit 2 includes a second heat exchange device 21, a throttling element 22, a pressurizing element 23, and a regulating valve 24. The second heat exchange device 21 and the first heat exchange device 4 are connected to the throttling element 22 together, and the first heat exchange device 4 and the second heat exchange device 21 are connected to the pressurizing element 23 together. The underground water source delivery unit 3 delivers water to the second heat exchange device 21. The pressurizing element 23 is used to pressurize the second working medium, so that the second working medium circulates in the circuit including the second heat exchange device 21, the throttling element 22, the first heat exchange device 4 and the regulating valve 24; Throttling element 22 is used to reduce the pressure of the second working medium; The regulating valve 24 is used to control the flow direction of the second working medium.

[0046] Specifically, one end of one passage of the second heat exchanger 21 is connected to the throttling element 22, and the other end is connected to the regulating valve 24. The throttling element 22 is connected to the second working medium passage of the first heat exchange device 4, and the second working medium passage of the first heat exchange device 4 is connected to the regulating valve 24. Both ends of the pressurizing element 23 are connected to the regulating valve 24; The flow direction of the second working medium can be changed through the specific connection method described above.

[0047] Other connection methods include connecting one end of the passage of the second heat exchange device 21 to the pressurizing element 23 and the other end to the regulating valve 24. The pressurizing element 23 is connected to the second working medium passage of the first heat exchange device 4, and the second working medium passage of the first heat exchange device 4 is connected to the regulating valve 24. Both ends of the throttling element 22 are connected to the regulating valve 24; The second specific connection method can also change the flow direction of the second working medium, but the flow direction of the second working medium under cooling / heating conditions is completely opposite to that in the first specific connection method.

[0048] The second heat exchange device 21 is a two-way heat exchanger, more specifically a two-way two-phase heat exchanger. One passage of the two-way heat exchanger serves as the passage for circulating the second working medium, and the other passage serves as the passage for transporting groundwater. The second heat exchange device 21 can also be a three-way heat exchanger, with the additional passage serving as an air loop. In practical applications, the gasification / liquefaction rate of the second working medium can also be increased by introducing airflow.

[0049] The throttling element 22 is specifically an expansion valve, or it can be a capillary / orifice plate integrated into the battery energy storage system.

[0050] The pressurizing element 23 is a compressor, or it can be a jet booster / steam ejector, etc.

[0051] The groundwater source delivery unit 3 includes a first pump body 31, which is used to deliver groundwater to the first heat exchange device 4 and also to deliver groundwater to the second heat exchange device 21.

[0052] The specific connection method is that the first pump body 31 can be connected to the second heat exchange device 21 through a pipeline, the second heat exchange device 21 can be connected to the first heat exchange device 4 through a pipeline, and the first heat exchange device 4 can be connected to the domestic water / industrial water discharge end through a pipeline. That is, the groundwater forms only one flow path, and the groundwater first passes through the second heat exchange device 21 and then through the first heat exchange device 4.

[0053] In other connection methods, the groundwater flow path can be divided into two. Two first pump bodies 31 can be used. One first pump body 31 is connected to a second heat exchanger 21 via a pipeline, and the second heat exchanger 21 is connected to the domestic / industrial water inlet via a pipeline. The other first pump body 31 is connected to a first heat exchanger 4 via a pipeline, and the first heat exchanger 4 is connected to the domestic / industrial water inlet via a pipeline.

[0054] The regulating valve 24 can be a four-way two-position reversing valve. The two ends of the pressurizing element 23 / throttling element 22, one end of the second working medium passage in the second heat exchange device 21, and one end of the second working medium passage in the first heat exchange device 4 are connected to the four-way two-position reversing valve to realize the reversal of the second working medium. The opening and closing of the groundwater circuit can be controlled by an independent solenoid valve.

[0055] The regulating valve 24 can also be an eight-way reversing valve, specifically an eight-way two-position reversing valve. When there is only one passage in the underground water supply unit 3, both ends of the pressurizing element 23 / throttling element 22, one end of the second working medium passage in the second heat exchange device 21, one end of the second working medium passage in the first heat exchange device 4, the input end of the first pump body 31, the discharge end of the underground water passage in the second heat exchange device 21, the discharge end of the underground water passage in the first heat exchange device 4, and the discharge end of industrial water / domestic water can all be connected to the eight-way two-position reversing valve, so that the second working medium can be reversed and cut off, while the water source cannot be reversed and can only be cut off.

[0056] The regulating valve 24 can also be a ten-way two-position reversing valve, which is suitable when there are two passages in the underground water source transportation unit 3. Both underground water circuits are connected to the ten-way two-position reversing valve, so that the second working medium can be reversed and cut off, and the two water sources cannot be reversed and can only be cut off.

[0057] The battery temperature control circulation unit 1 includes a second pump body 11 and a third pump body 12. The second pump body 11 is used to circulate the first working medium, so that the first working medium first exchanges heat with the battery module 13, and then exchanges heat with the second working medium of the heat pump circulation unit 2 through the first heat exchange device 4. The third pump body 12 is used to circulate the first working medium, so that the first working medium first exchanges heat with the PCS14, and then exchanges heat with the second working medium of the heat pump circulation unit 2 through the first heat exchange device 4.

[0058] The specific connection method can be as follows: the second pump body 11 is connected to the battery module 13; the first working medium discharge end of the battery module 13 is connected to the third pump body 12; the third pump body 12 is connected to the PCS 14; the first working medium discharge end of the PCS 14 is connected to the first working medium inlet end of the first heat exchange device 4; and the first working medium discharge end of the first heat exchange device 4 is connected to the second pump body 11, forming a single-path circulation of the first working medium. In this case, the first heat exchange device 4 can still be a three-way two-phase heat exchanger.

[0059] A specific connection method could also be as follows: the second pump body 11 is connected to the battery module 13, the first working medium discharge end of the battery module 13 is connected to the first heat exchange device 4, and the first heat exchange device 4 is connected to the second pump body 11; the third pump body 12 is connected to the PCS14, the first working medium discharge end of the PCS14 is connected to the first heat exchanger, and the first heat exchange device 4 is connected to the third pump body 12, thereby realizing the first working medium being connected in parallel to two paths, and the temperature of the PCS14 and the battery module 13 being adjusted by their respective pump bodies. In this case, the first heat exchange device 4 should be replaced with a four-way two-phase heat exchanger.

[0060] If the first heat exchange device 4 still adopts a three-way two-phase heat exchanger and the first working medium is still two-way, then a shunt pipe can be connected to the passage of the first heat exchange device 4, so that the shunt pipe at one end of the first heat exchange device 4 is connected to the PCS14 and the battery module 13, and the shunt pipe at the other end of the first heat exchange device 4 is connected to the second pump body 11 and the third pump body 12.

[0061] The second pump body 11 is an electronic water pump, and the third pump body 12 is a centrifugal pump. Example

[0062] like Figure 1 The water source heat pump type energy storage thermal management system includes a battery temperature control circulation unit 1, a heat pump circulation unit 2, an underground water source transportation unit 3, and a first heat exchange device 4.

[0063] The first heat exchange device 4 is a three-way two-phase heat exchanger.

[0064] The battery temperature control circulation unit 1 includes a second pump body 11 and a third pump body 12. The second pump body 11 is connected to the first working medium passage of the battery module 13, the first working medium passage of the battery module 13 is connected to the third pump body 12, the third pump body 12 is connected to the first working medium passage of the PCS 14, the first working medium passage of the PCS 14 is connected to the first working medium passage of the three-way two-phase heat exchanger, and the first working medium passage of the three-way two-phase heat exchanger is connected to the second pump body 11. The second pump body 11 is an electric water pump, and the third pump body 12 is a centrifugal pump.

[0065] The heat pump cycle unit 2 includes a second heat exchange device 21, a throttling element 22, a pressurizing element 23, and a regulating valve 24. The second heat exchange device 21 is a two-way two-phase heat exchanger, the throttling element 22 is an expansion valve, the pressurizing element 23 is a compressor, and the regulating valve 24 is an eight-way two-position reversing valve.

[0066] One end of the second working medium passage of the two-way two-phase heat exchanger is connected to the expansion valve, and the other end is connected to the eight-way two-position reversing valve. The expansion valve is connected to one end of the second working medium passage of the three-way two-phase heat exchanger, and the other end of the second working medium passage of the three-way two-phase heat exchanger is connected to the eight-way two-position reversing valve. Both ends of the compressor are connected to the eight-way two-position reversing valve.

[0067] The underground water supply unit 3 includes a first pump body 31. The output end of the first pump body 31 is connected to an eight-way two-position reversing valve through a pipeline. One end of the underground water passage of the two-way two-phase heat exchanger is connected to the eight-way two-position reversing valve. The other end of the underground water passage of the two-way two-phase heat exchanger is connected to one end of the underground water passage of the three-way two-phase heat exchanger. The other end of the underground water passage of the three-way two-phase heat exchanger is connected to the eight-way two-position reversing valve. The discharge end of domestic water / industrial water is connected to the eight-way two-position reversing valve.

[0068] The first working medium is an aqueous solution of ethylene glycol, and the second working medium is Freon. Furthermore, the flow rate / velocity of the groundwater needs to be appropriately controlled to minimize the significant temperature changes in the groundwater caused by Freon during heat absorption / release.

[0069] The implementation principle of Example 1 is as follows: the first pump body 31, the second pump body 11 and the third pump body 12 are normally open, and the eight-way two-position reversing valve always keeps the groundwater passage open.

[0070] like Figure 2 When the ambient temperature is high, the compressor is turned on, which pressurizes the Freon to a high-pressure state and increases its condensation temperature. The Freon then enters a two-way two-phase heat exchanger to release heat and condense. The groundwater absorbs the released heat in the two-way two-phase heat exchanger, causing the second working medium to condense into a liquid state. After condensation, the Freon undergoes throttling and pressure reduction as it flows through the expansion valve, resulting in a decrease in pressure and saturation temperature, forming low-pressure, low-temperature wet vapor. The low-pressure Freon then enters a three-way two-phase heat exchanger to evaporate and absorb heat, cooling the ethylene glycol aqueous solution while simultaneously vaporizing the Freon. Afterward, the vaporized Freon re-enters the compressor via an eight-way two-position reversing valve, completing the cycle.

[0071] like Figure 3 Under suitable ambient temperature conditions, the compressor stops working, and the cooling needs can be met by directly exchanging heat between the groundwater and the ethylene glycol solution, thereby reducing energy consumption and achieving energy-saving operation. like Figure 4 Under low-temperature conditions, groundwater can be used to directly heat the ethylene glycol solution, thereby increasing its temperature and heating the battery energy storage system. like Figure 5 In extremely cold environments, when the compressor is turned on, the eight-way two-position reversing valve is adjusted to change the flow direction of the Freon, causing it to be pressurized and first enter the three-way two-phase heat exchanger for exothermic condensation. At this time, the ethylene glycol aqueous solution absorbs the condensation heat released by the Freon, thus achieving heating, and the Freon condenses into a liquid state here.

[0072] After condensation, the Freon flows through the expansion valve, where it undergoes throttling and pressure reduction. The pressure decreases, the saturation temperature drops, and it enters the low-pressure zone before entering the two-way two-phase heat exchanger. There, it absorbs heat from the groundwater and vaporizes. The vaporized Freon then re-enters the compressor for pressurization, increasing its temperature and freezing point, continuing the cycle.

[0073] It improves temperature control capability and energy efficiency under different environmental conditions. When the groundwater temperature is suitable, the ethylene glycol aqueous solution can directly exchange heat with the groundwater to achieve energy-saving operation. When the ambient temperature is high or low and cannot meet the heat exchange requirements, the heat pump circulation unit 2 uses Freon to exchange heat with the ethylene glycol aqueous solution. At the same time, the groundwater continuously exchanges heat with the ethylene glycol solution to achieve cooling or heating and improve temperature control capability.

[0074] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water source heat pump type energy storage thermal management system, characterized in that: It includes a battery temperature control circulation unit (1), a heat pump circulation unit (2), an underground water source delivery unit (3), and a first heat exchange device (4); The battery temperature control circulation unit (1) is used to circulate the first working medium, so that the first working medium first exchanges heat with the battery energy storage system, and then exchanges heat with the second working medium of the heat pump circulation unit (2) through the first heat exchange device (4). The heat pump circulation unit (2) is used to circulate the second working medium, so that the second working medium first exchanges heat with the groundwater provided by the groundwater source transportation unit (3), and then exchanges heat with the first working medium through the first heat exchange device (4); The underground water source delivery unit (3) is used to deliver underground water to the battery temperature control circulation unit (1). The underground water exchanges heat with the first working medium through the first heat exchange device (4). It is also used to deliver underground water to the heat pump circulation unit (2) to exchange heat with the second working medium.

2. The water source heat pump type energy storage thermal management system according to claim 1, characterized in that: The first heat exchange device (4) includes a three-way heat exchanger, and each channel of the three-way heat exchanger is connected to the battery temperature control circulation unit (1), the heat pump circulation unit (2) and the underground water source delivery unit (3), respectively.

3. The water source heat pump type energy storage thermal management system according to claim 1, characterized in that: The heat pump circulation unit (2) includes a second heat exchange device (21), a throttling element (22), a pressurizing element (23), and a regulating valve (24). The second heat exchange device (21) and the first heat exchange device (4) are connected to the throttling element (22). The first heat exchange device (4) and the second heat exchange device (21) are connected to the pressurizing element (23). The underground water source delivery unit (3) delivers water to the second heat exchange device (21). The pressurizing element (23) is used to pressurize the second working medium so that the second working medium circulates in the loop including the second heat exchange device (21), the throttling element (22), the first heat exchange device (4) and the regulating valve (24); The throttling element (22) is used to reduce the pressure of the second working medium; The regulating valve (24) is used to control the flow direction of the second working medium.

4. The water source heat pump type energy storage thermal management system according to claim 3, characterized in that: The second heat exchange device (21) is a two-way heat exchanger, the throttling element (22) is an expansion valve, and the pressurizing element (23) is a compressor.

5. The water source heat pump type energy storage thermal management system according to claim 3, characterized in that: The underground water source delivery unit (3) includes a first pump body (31), which is used to deliver groundwater to the first heat exchange device (4) and also to deliver groundwater to the second heat exchange device (21).

6. The water source heat pump type energy storage thermal management system according to claim 5, characterized in that: The regulating valve (24) is an eight-way reversing valve. The eight-way reversing valve is connected to the output and input ends of the pressurizing element (23), one end of the second heat exchange device (21) that transports groundwater, one end of the second heat exchange device (21) that transports the second working medium, the input end of the first pump body (31), and one end of the first heat exchange device (4) that outputs groundwater. The regulating valve (24) is also used to discharge the groundwater that has passed through the first heat exchange device (4).

7. The water source heat pump type energy storage thermal management system according to claim 1, characterized in that: The battery temperature control circulation unit (1) includes a second pump body (11) and a third pump body (12). The second pump body (11) is used to circulate the first working medium, so that the first working medium first exchanges heat with the battery module (13), and then exchanges heat with the second working medium of the heat pump circulation unit (2) through the first heat exchange device (4). The third pump body (12) is used to circulate the first working medium, so that the first working medium first exchanges heat with the PCS (14), and then exchanges heat with the second working medium of the heat pump circulation unit (2) through the first heat exchange device (4).

8. The water source heat pump type energy storage thermal management system according to claim 7, characterized in that: The second pump body (11) is connected to the battery module (13), the first working medium discharge end of the battery module (13) is connected to the third pump body (12), the third pump body (12) is connected to the PCS (14), the first working medium discharge end of the PCS (14) is connected to the first working medium inlet end of the first heat exchange device (4), and the first working medium discharge end of the first heat exchange device (4) is connected to the second pump body (11).

9. The water source heat pump type energy storage thermal management system according to claim 1, characterized in that: The water discharged from the first heat exchange device (4) is used for domestic water / industrial water.

10. The water source heat pump type energy storage thermal management system according to claim 7, characterized in that: The second pump body (11) is an electronic water pump, and the third pump body (12) is a centrifugal pump.

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