Dual temperature water supply integrated thermal management system and method

Abstract

The application provides an integrated thermal management system and method for double-temperature water supply, and the system comprises a plate heat exchanger, an air source heat pump system located at one side of the plate heat exchanger, and a double-temperature water supply system located at the other side of the plate heat exchanger; a first water inlet of the plate heat exchanger is communicated with the double-temperature water supply system, a first refrigerant flow passage of the plate heat exchanger is communicated with the air source heat pump system, a first water outlet of the plate heat exchanger is communicated with the double-temperature water supply system, and a second refrigerant flow passage of the plate heat exchanger is communicated with the air source heat pump system. When the integrated thermal management system for double-temperature water supply is applied to the thermal management of energy storage batteries, the following can be achieved: 1) under the condition that the chilled water supply temperature is 15-18 DEG C, the optimal chilled water flow rate and heat exchange area can be met, so that the maximum temperature of each battery and the maximum temperature difference in the battery are lower than 35 DEG C and 5 DEG C, respectively; and 2) the dry bulb temperature and the wet bulb temperature of the indoor environment are kept at 25 DEG C and lower than the liquid cooling water temperature, respectively, so that the condensation phenomenon on the surface of the battery pack is avoided.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration technology, specifically relating to an integrated thermal management system and method for dual-temperature water supply. Background Technology

[0002] Battery energy storage systems (BESS) are a crucial component of green and sustainable energy and have been widely applied in various new energy scenarios. Ensuring the safe and high-performance operation of BESS is closely related to the battery thermal management system (BTMS). For example... Figure 1 and Figure 2 As shown, at higher temperatures, the battery's output power increases, but its efficiency decreases with increasing temperature, accelerating degradation and aging. Battery performance and lifespan also decrease at low temperatures.

[0003] Currently, the main battery thermal management systems (BTMS) on the market are air cooling and liquid cooling technologies. For example... Figure 3 As shown, these cooling systems each have their own advantages and disadvantages in terms of energy consumption, cooling performance, reliability, and safety. Due to the compactness and high efficiency of liquid cooling systems, most practical applications use liquid cooling systems, with bottom cooling being the most popular design currently. Bottom cooling systems consist of modular, integral cooling plates with grooves pressed into the cooling channels inside the plates to increase strength and heat exchange efficiency. However, the biggest problem with traditional liquid cooling systems is the use of low supply water temperatures (7-10℃), which requires the wet-bulb temperature of the ambient air to be lower than the supply water temperature (difficult to achieve with current technology). Otherwise, condensation will occur on the surface of the heat exchanger and battery pack, leading to battery pack corrosion and even short circuits.

[0004] like Figure 4 As shown, existing experimental data on resistance heating indicate that, under normal ambient temperature (25°C), when the cooling medium is a mixture of water and ethylene glycol, the width of the cooling plate is 70 mm, the mass flow rate is greater than 0.21 kg / s, and the cold water inlet temperature is 18°C, the maximum temperature and the maximum internal temperature difference of each battery in the five battery packs are less than 35°C and 5°C, respectively, achieving optimal cooling performance.

[0005] When using a liquid cooling system alone, hot air accumulates at the top, making it difficult to control the ambient temperature and temperature gradient of the space. To keep the upper temperature within an acceptable range, it is necessary to increase the output of the liquid cooling system (high flow rate at low temperatures) to indirectly control the ambient temperature, resulting in energy waste. Summary of the Invention

[0006] To address the aforementioned deficiencies, this invention provides an integrated thermal management system and method for dual-temperature water supply. When applied to the thermal management of energy storage batteries, the integrated thermal management system provided by this invention can achieve the following: 1) Under the condition of a chilled water supply temperature of 15-18℃, it can meet the optimal chilled water flow rate and heat exchange area, ensuring that the maximum temperature of each battery and the maximum internal temperature difference are below 35℃ and 5℃, respectively; 2) Maintaining the dry-bulb and wet-bulb temperatures of the indoor environment at 25℃ and below the liquid cooling water temperature, respectively, to prevent condensation on the battery pack surface; 3) Utilizing an air-source heat pump system to perform different phase change conversions on the refrigerant, thereby exchanging heat with the return water from the air-cooled and water-cooled circuits within the plate heat exchanger. This cools or heats the return water entering the plate heat exchanger, and then uses the water returning to the air-cooled and water-cooled circuits through the first outlet to cool or heat the energy storage battery and its surrounding environment, ensuring that the temperature of the energy storage battery and its surrounding environment remains within the normal operating temperature range.

[0007] The present invention provides the following technical solution: an integrated thermal management system for dual-temperature water supply, including a plate heat exchanger, an air source heat pump system located on one side of the plate heat exchanger, and a dual-temperature water supply system located on the other side of the plate heat exchanger;

[0008] The first inlet of the plate heat exchanger is connected to the dual-temperature water supply system, the first refrigerant outlet of the plate heat exchanger is connected to the air source heat pump system, the first outlet of the plate heat exchanger is connected to the dual-temperature water supply system, and the second refrigerant outlet of the plate heat exchanger is connected to the air source heat pump system.

[0009] The first water inlet and the first water outlet are located on the same side of the plate heat exchanger near the dual-temperature water supply system; the first refrigerant inlet and the second refrigerant inlet are located on the same side of the plate heat exchanger near the air source heat pump system.

[0010] Furthermore, the air source heat pump system includes the reversing valve, compressor, first finned heat exchanger, and expansion valve; the first refrigerant inlet of the plate heat exchanger is connected to the expansion valve of the air source heat pump system; the reversing valve includes a first inlet, a second inlet, a third inlet, and a fourth inlet.

[0011] Furthermore, the dual-temperature water supply system includes a three-way valve connected to the first inlet, a water pump connected to the inlet of the three-way valve, a second finned heat exchanger, an air-cooled circuit and a water-cooled circuit connected to the first outlet, and a return water pipe; the three-way valve also includes a first outlet and a second outlet; the first outlet of the three-way valve is connected to the second finned heat exchanger.

[0012] Furthermore, the second refrigerant inlet of the plate heat exchanger is connected to the third inlet of the reversing valve of the air source heat pump system; the fourth inlet of the reversing valve is connected to the first finned heat exchanger; and the first and second inlets of the reversing valve are connected to the air outlet and air inlet of the compressor, respectively.

[0013] Furthermore, the inlet water temperature of the air-cooled circuit is controlled at T. es =10℃~12℃, the inlet water temperature of the water-cooling circuit is controlled at T ws =15℃~18℃; the air-cooled circuit is connected to the air conditioner terminal and is used to maintain the wet-bulb temperature of the environment where the battery pack is located below the temperature T of the water-cooled circuit. ws When the dual-temperature water supply system is used to cool the energy storage battery and its surrounding environment, the water-cooled circuit is used to cool the energy storage battery, and the air-cooled circuit is used to cool the environment; when the dual-temperature water supply system is used to heat the energy storage battery and its surrounding environment, the water-cooled circuit is used to heat the energy storage battery, and the air-cooled circuit is used to heat the environment; the return water from both the air-cooled circuit and the water-cooled circuit is connected to the water pump through the return water pipe.

[0014] Furthermore, the first outlet of the plate heat exchanger is connected to the inlet pipes of the air-cooled circuit and the water-cooled circuit of the dual-temperature water supply system.

[0015] Furthermore, the first inlet of the plate heat exchanger is connected to the second outlet of the three-way valve of the dual-temperature water supply system.

[0016] This invention also provides an integrated thermal management method for dual-temperature water supply using the system described above, comprising the following steps:

[0017] S1: When the energy storage battery is in a charging or discharging state, the integrated thermal management system controlling the dual-temperature water supply is turned on, thereby cooling the energy storage battery and the air inside the energy storage container.

[0018] S2: When the energy storage battery is idle, the water-cooling circuit is shut down, and the air-cooling circuit is controlled to operate according to the indoor ambient temperature, maintaining the wet-bulb temperature of the ambient temperature below the temperature T of the water-cooling circuit. ws ;

[0019] S3: When the outdoor temperature of the container is below 10°C but above 0°C in winter, the air source heat pump system is controlled to stop working, and the air provides the cooling capacity required for cooling the water in the water cooling circuit through the second finned heat exchanger.

[0020] S4: When the outdoor temperature of the container is below 0°C in winter, the air source heat pump system is controlled to work in reverse in the initial stage to provide appropriate heat to the room, maintain the air temperature inside the energy storage container above 0°C, and provide the cooling capacity required for cooling the water in the water cooling circuit through the second fin heat exchanger.

[0021] S5: Control the system to switch between different combinations of cooling, heating and shutdown of the air source heat pump system in real time according to the indoor and outdoor ambient temperature and the working status of the energy storage battery, so as to keep the system in the optimal state.

[0022] Further, step S1 includes the following steps:

[0023] S11: Control the compressor of the air source heat pump system and the water pump of the dual-temperature water supply system to start;

[0024] S12: The return water from the air-cooled and water-cooled circuits passes through the inlet of the water pump and the three-way valve, and enters the first inlet of the plate heat exchanger through the three-way valve; simultaneously, the low-temperature, low-pressure liquid refrigerant from the air-source heat pump system enters the first refrigerant outlet of the plate heat exchanger; the return water from the air-cooled and water-cooled circuits is cooled by the low-temperature, low-pressure liquid refrigerant from the air-source heat pump system entering the plate heat exchanger within the plate heat exchanger, and the cooled return water returns to the dual-temperature water supply system through the first outlet of the plate heat exchanger for cooling the air inside the battery and energy storage container; the low-temperature, low-pressure liquid refrigerant flowing into the plate heat exchanger from the air-cooled and water-cooled circuits absorbs heat through heat exchange in the plate heat exchanger and evaporates to form low-temperature, low-pressure refrigerant vapor, which enters the air-source heat pump system through the second refrigerant outlet of the plate heat exchanger;

[0025] S13: The low-temperature, low-pressure refrigerant vapor that enters the air source heat pump system in step S12 enters the compressor through the third port of the reversing valve and then through the second port of the reversing valve. After being compressed into high-temperature, high-pressure refrigerant vapor, it enters the first finned heat exchanger through the first port and then through the fourth port of the reversing valve. In the first finned heat exchanger, it exchanges heat with the outside air of the energy storage container. The high-temperature, high-pressure refrigerant vapor releases heat and undergoes a phase change. After being condensed into high-temperature, high-pressure liquid refrigerant, it passes through the expansion valve and becomes low-temperature, low-pressure liquid refrigerant. It then flows through the first refrigerant port of the plate heat exchanger and enters the plate heat exchanger, where it is used again to cool the return water of the dual-temperature water supply system.

[0026] Furthermore, in step S4, when the outdoor temperature of the container is below 0°C in winter, the air source heat pump system is controlled to operate in reverse during the initial stage to provide appropriate heat to the interior, maintaining the air temperature inside the energy storage container above 0°C, and the air provides the cooling capacity required for cooling the water in the water-cooling circuit through the second finned heat exchanger, including the following steps:

[0027] S41: Control the reversing valve in the air source heat pump system to switch the third and fourth flow ports, and at the same time control the first flow port to be connected to the third flow port and the fourth flow port to be connected to the second flow port. Then, the refrigerant in the plate heat exchanger flows out through the first refrigerant flow port, flows through the expansion valve, the first finned heat exchanger, the compressor and the reversing valve in sequence, and then enters the plate heat exchanger again through the second refrigerant flow port.

[0028] S42: Control the compressor of the air source heat pump system to start; the low-temperature and low-pressure liquid refrigerant in the air source heat pump system absorbs heat from the outside air in the first finned heat exchanger and vaporizes into low-temperature and low-pressure refrigerant vapor. The low-temperature and low-pressure refrigerant vapor enters the compressor through the fourth flow port of the reversing valve, enters the compressor through the second flow port of the reversing valve, is compressed into high-temperature and high-pressure refrigerant vapor, flows out of the compressor, enters the reversing valve again through the first flow port, flows out through the third flow port of the reversing valve, and enters the plate heat exchanger through the second refrigerant flow port of the plate heat exchanger.

[0029] S43: After the warm water in the air-cooled circuit and water-cooled circuit of the dual-temperature water supply system heats the environment, it enters the plate heat exchanger through the return water pipe, the water pump and the second outlet of the three-way valve, and enters the plate heat exchanger through the first inlet. The high-temperature and high-pressure refrigerant vapor entering the plate heat exchanger exchanges heat with the return water of the dual-temperature water supply system that enters the plate heat exchanger through the first inlet.

[0030] The high-temperature, high-pressure refrigerant vapor releases heat and condenses into a high-temperature, high-pressure liquid refrigerant, which then enters the air-source heat pump system through the first refrigerant inlet. The return water from the plate heat exchanger in the dual-temperature water supply system absorbs heat and then returns to the dual-temperature water supply system through the first outlet to heat the air inside the battery and energy storage container. This ensures that the temperature inside the battery and energy storage container is maintained above 0°C to prevent the battery from becoming inefficient or even losing its lifespan due to excessively low temperatures.

[0031] S44: The high-temperature, high-pressure liquid refrigerant that enters the air source heat pump system through the first refrigerant inlet in step S43 is transformed into a low-temperature, low-pressure liquid refrigerant after being processed by the expansion valve. The low-temperature, low-pressure liquid refrigerant enters the first finned heat exchanger to continue absorbing heat from the outside air of the container and begins the next heating cycle.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. The integrated thermal management system with dual-temperature water supply provided by the present invention uses two cooling methods, air cooling circuit and water cooling circuit, to cool the energy storage battery and the air. One circuit can be turned on alone or both circuits can be turned on as needed to meet the temperature and flow requirements of each circuit and save energy to the maximum extent.

[0034] 2. This invention enables the use of a hybrid cooling system that combines indoor ambient air cooling and battery pack water cooling (water cooling circuit): an integrated thermal management system with dual-temperature water supply to avoid condensation on the heat exchanger and battery pack surfaces, while achieving optimal cooling performance.

[0035] 3. The integrated thermal management system with dual-temperature water supply provided by this invention can reverse the refrigerant flow direction of the air source heat pump system by changing the refrigerant flow direction of the third and fourth flow ports of the reversing valve, thereby regulating the temperature of the energy storage battery and the surrounding air environment, and ensuring the normal operation of the energy storage battery and the container; in hot and humid working environments, it can cool the internal environment of the container; in cold external environments with temperatures below 0°C, it can use the refrigerant in the air source heat pump system to exchange heat with the return water in the air-cooled and water-cooled circuits in the plate heat exchanger to raise the temperature of the return water, thereby raising the temperature of the energy storage battery and the air inside the container. Attached Figure Description

[0036] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0037] Figure 1 This is a graph showing the performance variation of lithium batteries under different operating temperatures in the existing technology.

[0038] Figure 2 This is a graph showing the cycle life of lithium batteries in the current technology within the average operating temperature range.

[0039] Figure 3 A comparison chart of the advantages and disadvantages of air cooling and liquid cooling technologies applied to BTMS in the prior art;

[0040] Figure 4 A schematic diagram of an experimental model structure for resistance heating in the prior art;

[0041] Figure 5 A schematic diagram of the integrated thermal management system for dual-temperature water supply provided by the present invention;

[0042] Figure 6 A schematic diagram of the liquid flow direction in the air source heat pump system when heating the air inside the energy storage battery and container provided by the present invention;

[0043] Figure 7 This is a schematic diagram of the air-cooled circuit and water-cooled circuit in the system provided by the present invention;

[0044] Figure 8 This diagram illustrates the changes in heat generated by a battery energy storage system (BESS) during a one-hour full charge and discharge cycle.

[0045] In the diagram: 1. Plate heat exchanger; 101. First inlet; 102. First outlet; 111. First refrigerant inlet; 112. Second refrigerant inlet; 2. Air source heat pump system; 21. Reversing valve; 201. First inlet; 202. Second inlet; 203. Third inlet; 204. Fourth inlet; 22. Compressor; 23. First finned heat exchanger; 24. Expansion valve; 3. Dual-temperature water supply system; 31. Water pump; 32. Three-way valve; 320. Inlet; 321. First outlet of three-way valve; 322. Second outlet of three-way valve; 33. Second finned heat exchanger; 34. Air-cooled circuit; 35. Water-cooled circuit; 36. Return water pipe. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figure 5 As shown, the present invention provides an integrated thermal management system for dual-temperature water supply, including a plate heat exchanger 1, an air source heat pump system 2 located on one side of the plate heat exchanger 1, and a dual-temperature water supply system 3 located on the other side of the plate heat exchanger 1.

[0048] The first inlet 101 of the plate heat exchanger 1 is connected to the dual-temperature water supply system 3, the first refrigerant outlet 111 of the plate heat exchanger is connected to the air source heat pump system 2, the first outlet 102 of the plate heat exchanger is connected to the dual-temperature water supply system 3, and the second refrigerant outlet 112 of the plate heat exchanger 1 is connected to the air source heat pump system 2.

[0049] The first inlet 101 and the first outlet 102 are located on the same side of the plate heat exchanger 1 near the dual-temperature water supply system 3; the first refrigerant inlet 111 and the second refrigerant inlet 112 are located on the same side of the plate heat exchanger 1 near the air source heat pump system 2.

[0050] Furthermore, the air source heat pump system 2 includes a reversing valve 21, a compressor 22, a first finned heat exchanger 23, and an expansion valve 24; the first refrigerant inlet 111 of the plate heat exchanger is connected to the expansion valve 24 of the air source heat pump system 2; the reversing valve includes a first inlet 201, a second inlet 202, a third inlet 203, and a fourth inlet 204.

[0051] Furthermore, the dual-temperature water supply system 3 includes a three-way valve 32 connected to the first inlet 101, a water pump 31 connected to the inlet 320 of the three-way valve 32, a second finned heat exchanger 33, an air-cooled circuit 34 and a water-cooled circuit 35 connected to the first outlet 102, and a return water pipe 36; the three-way valve 32 also includes a first outlet 321 and a second outlet 322; the first outlet 321 of the three-way valve is connected to the second finned heat exchanger 33.

[0052] Furthermore, the second refrigerant inlet 112 of the plate heat exchanger is connected to the third inlet 203 of the reversing valve 21 of the air source heat pump system, and the fourth inlet 204 of the reversing valve 21 is connected to the first finned heat exchanger 23. The first inlet 201 and the second inlet 202 of the reversing valve 21 are respectively connected to the outlet and inlet of the compressor 22. That is, the first inlet 201 is connected to the outlet of the compressor 22, and the second inlet 202 is connected to the inlet of the compressor 22.

[0053] Furthermore, the inlet water temperature of the air-cooled circuit 34 is controlled at T. es =10℃~12℃, the inlet water temperature of water-cooled circuit 35 is controlled at T ws =15℃~18℃; Air-cooled circuit 34 is connected to the air conditioning terminal to maintain the wet-bulb temperature of the battery pack's ambient temperature below the temperature T of water-cooled circuit 35. ws When the dual-temperature water supply system is used to cool the energy storage battery and its surrounding environment, the water-cooled circuit 35 is used to cool the energy storage battery and the air-cooled circuit 34 is used to cool the environment; when the dual-temperature water supply system is used to heat the energy storage battery and its surrounding environment, the water-cooled circuit 35 is used to heat the energy storage battery and the air-cooled circuit 34 is used to heat the environment; the return water of both the air-cooled circuit 34 and the water-cooled circuit 35 is connected to the water pump 31 through the return water pipe 36.

[0054] Furthermore, the first outlet 102 of the plate heat exchanger is connected to the inlet pipes of the air-cooled circuit 34 and the water-cooled circuit 35 of the dual-temperature water supply system 3.

[0055] Furthermore, the first inlet 101 of the plate heat exchanger 1 is connected to the second outlet 322 of the three-way valve of the three-way valve 32 of the dual-temperature water supply system 3.

[0056] The return water from the air-cooled circuit 34 and the water-cooled circuit 35, after cooling or heating the energy storage battery and its surrounding environment, is connected to the water pump 31 through the return water pipe 36. Powered by the water pump 31, the return water enters the three-way valve 32 through the inlet 320. The return water is divided within the three-way valve 32. One part enters the second finned heat exchanger 33 through the first outlet 321 of the three-way valve 32, where it exchanges heat with the air inside the energy storage container before entering the inlet pipe of the water-cooled circuit 35. The other part enters the plate heat exchanger 1 through the first inlet 101 of the plate heat exchanger 1 through the second outlet 322 of the three-way valve 32. In the plate heat exchanger, it exchanges heat with the refrigerant treated by the air source heat pump system 2, thereby cooling or heating the return water again. Then, it flows out of the plate heat exchanger through the first outlet 102 and continues to be used to cool or heat the energy storage battery and the environment inside the container.

[0057] Battery energy storage systems (BESS) have three operating states: charging, discharging, and idle. The battery releases different amounts of heat under different states of charge / discharge (SoC), such as... Figure 8 The figure shows the heat changes generated by the battery energy storage system (BESS) during a one-hour full charge and discharge cycle. Therefore, based on different operating states of the battery energy storage system (BESS), this invention also provides an integrated thermal management method using a dual-temperature water supply system as described above. The method includes the following steps:

[0058] S1: When the energy storage battery is charging or discharging, the integrated thermal management system that controls the dual-temperature water supply cools the energy storage battery and the air inside the energy storage container.

[0059] S2: When the energy storage battery is idle, the water-cooling circuit 35 is shut off, and the air-cooling circuit 34 is controlled to operate according to the indoor ambient temperature, keeping the wet-bulb temperature of the ambient temperature lower than the temperature T of the water-cooling circuit 35. ws ;

[0060] S3: When the outdoor temperature of the container is below 10°C but above 0°C in winter, the air source heat pump system 2 is stopped, and the air provides the cooling capacity required for cooling the water in the water cooling circuit 35 through the second fin heat exchanger 33.

[0061] S4: When the outdoor temperature of the container is below 0°C in winter, the air source heat pump system 2 is controlled to work in reverse in the initial stage to provide appropriate heat to the room, keep the air temperature inside the energy storage container above 0°C, and the air provides the cooling capacity required for cooling the water in the water cooling circuit 35 through the second fin heat exchanger 33.

[0062] S5: The control system switches between different combinations of cooling, heating and shutdown of the air source heat pump system 2 in real time according to the indoor and outdoor ambient temperature and the working status of the energy storage battery, so as to keep the system in the optimal state.

[0063] Furthermore, step S1 includes the following steps:

[0064] S11: Control the compressor 22 of the air source heat pump system 2 and the water pump 31 of the dual-temperature water supply system to start;

[0065] S12: The return water in the air-cooled circuit 34 and the water-cooled circuit 35 passes through the water pump 31 and the inlet 320 of the three-way valve, and enters the first inlet 101 of the plate heat exchanger 1 through the three-way valve 322; at the same time, the low-temperature, low-pressure liquid refrigerant in the air source heat pump system 2 enters the first refrigerant flow port 111 of the plate heat exchanger 1; the return water in the air-cooled circuit 34 and the water-cooled circuit 35 is cooled by the low-temperature, low-pressure liquid refrigerant entering the plate heat exchanger 1 from the air source heat pump system 2, and the cooled return water passes through the plate heat exchanger. The first outlet 102 of the device returns to the dual-temperature water supply system 3 to cool the air inside the battery and energy storage container; the low-temperature, low-pressure liquid refrigerant flowing into the plate heat exchanger 1 in the air source heat pump system 2 evaporates after absorbing heat through heat exchange with the return water of the air-cooled circuit 34 and water-cooled circuit 35 that enter through the first inlet 101 in the plate heat exchanger 1, forming low-temperature, low-pressure refrigerant vapor, and the low-temperature, low-pressure refrigerant vapor enters the air source heat pump system through the second refrigerant flow port 112 of the plate heat exchanger;

[0066] S13: The low-temperature, low-pressure refrigerant vapor that enters the air source heat pump system 2 in step S12 enters the compressor 22 through the third flow port 203 of the reversing valve 21 and the second flow port 202 of the reversing valve 21. After being compressed into high-temperature, high-pressure refrigerant vapor, it enters the first finned heat exchanger 23 through the first flow port 201 of the reversing valve 21 and the fourth flow port 204 of the reversing valve 21. In the first finned heat exchanger 23, it exchanges heat with the outside air of the energy storage container. The high-temperature, high-pressure refrigerant vapor releases heat and undergoes a phase change. After being condensed into high-temperature, high-pressure liquid refrigerant, it passes through the expansion valve 24 and becomes low-temperature, low-pressure liquid refrigerant. It then flows through the first refrigerant flow port 111 into the plate heat exchanger 1 and is used again to cool the return water of the dual-temperature water supply system 2.

[0067] The present invention also provides a method for heating the air inside the energy storage battery and the container using an integrated thermal management system with dual-temperature water supply. Specifically, in step S4, when the outdoor temperature of the container is below 0°C in winter, the air source heat pump system 2 is controlled to operate in reverse in the initial stage to provide appropriate heat to the interior, maintaining the air temperature inside the energy storage container above 0°C, and the air provides the cooling capacity required for cooling the cooling water in the water-cooled circuit 35 through the second finned heat exchanger 33. This includes the following steps:

[0068] S41: As Figure 6 As shown, the third flow port 203 and the fourth flow port 204 of the reversing valve 21 in the air source heat pump system 2 are switched. At the same time, the first flow port 201 is switched to be connected to the third flow port 203 and the fourth flow port 204 is switched to be connected to the second flow port 202. Then, the refrigerant in the plate heat exchanger 1 flows out through the first refrigerant flow port 111, flows through the expansion valve 24, the first finned heat exchanger 23, the compressor 22 and the reversing valve 21 in sequence, and then enters the plate heat exchanger 1 again through the second refrigerant flow port 112.

[0069] S42: Control the compressor 22 of the air source heat pump system 2 to start; The low-temperature and low-pressure liquid refrigerant in the air source heat pump system 2 absorbs heat from the outside air in the first finned heat exchanger 23 and vaporizes into low-temperature and low-pressure refrigerant vapor. The low-temperature and low-pressure refrigerant vapor enters the compressor 22 through the fourth flow port 204 of the reversing valve 21 and the second flow port 202 of the reversing valve 21. After being compressed into high-temperature and high-pressure refrigerant vapor, it flows out of the compressor 22, enters the reversing valve 21 again through the first flow port 201, flows out through the third flow port 203 of the reversing valve 21, and enters the plate heat exchanger 1 through the second refrigerant flow port 112 of the plate heat exchanger 1.

[0070] S43: After the warm water in the air-cooled circuit 34 and water-cooled circuit 35 of the dual-temperature water supply system 3 heats the environment, it enters the plate heat exchanger 1 from the first inlet 101 through the return water pipe 36, water pump 31 and the second outlet 322 of the three-way valve; the high-temperature and high-pressure refrigerant vapor entering the plate heat exchanger 1 exchanges heat with the return water of the dual-temperature water supply system 3 entering the plate heat exchanger 1 through the first inlet 101.

[0071] The high-temperature, high-pressure refrigerant vapor releases heat and condenses into a high-temperature, high-pressure liquid refrigerant, which then enters the air source heat pump system through the first refrigerant outlet 111. The return water from the plate heat exchanger in the dual-temperature water supply system 3 absorbs heat and then returns to the dual-temperature water supply system 3 through the first outlet 102 to heat the air inside the battery and energy storage container. This ensures that the temperature inside the battery and energy storage container is kept above 0°C to prevent the battery from becoming inefficient or even losing its lifespan due to excessively low temperatures.

[0072] S44: The high-temperature, high-pressure liquid refrigerant that enters the air source heat pump system 2 through the first refrigerant flow port 111 in step S43 is processed by the expansion valve 24 and becomes a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant enters the first finned heat exchanger 23 and continues to absorb heat from the outside air of the container to start the next heating cycle.

[0073] This invention involves introducing a low-temperature, low-pressure liquid refrigerant from an air-source heat pump system into a plate heat exchanger. This cools the return water from the air-cooled and water-cooled circuits of the dual-temperature water supply system, which then enters the plate heat exchanger through a return water pipe. Simultaneously, the low-temperature, low-pressure liquid refrigerant absorbs heat and transforms into low-temperature, low-pressure refrigerant vapor, which then flows back into the air-source heat pump system through a second refrigerant outlet. There, it is pressurized by a compressor into high-temperature, high-pressure refrigerant vapor. After passing through a first finned heat exchanger, it is condensed into high-temperature, high-pressure liquid refrigerant. This vapor is then processed by an expansion valve, becoming a low-temperature, low-pressure liquid refrigerant, which re-enters the plate heat exchanger through the first refrigerant outlet to further cool the return water of the dual-temperature water supply system.

[0074] When the outside air is cold, causing the ambient temperature inside the energy storage battery and container to drop below 0°C, the refrigerant flow direction within the air source heat pump system is reversed by changing the refrigerant flow direction at the third and fourth ports of the reversing valve. Simultaneously, the first port, previously connected to the fourth port for cooling, is now connected to the third port. This, in turn, connects the second and fourth ports, reversing the refrigerant flow direction within the air source heat pump system. At this point, the low-temperature, low-pressure liquid refrigerant in the air source heat pump system absorbs heat from the outside air and vaporizes in the first finned heat exchanger, becoming low-temperature, low-pressure refrigerant vapor, which then enters the compressor. After compression, the refrigerant becomes high-temperature, high-pressure refrigerant vapor, which then enters the plate heat exchanger through the second refrigerant inlet. This vapor heats the cold water entering the plate heat exchanger from the dual-temperature water supply system. The heated water then enters the air-cooled and water-cooled circuits through the first outlet to heat the environment inside the energy storage battery and container. The refrigerant, after heat exchange, condenses due to heat release and transforms back into high-temperature, high-pressure liquid refrigerant. It then returns to the air-source heat pump system through the first refrigerant inlet. After passing through the expansion valve, it becomes low-temperature, low-pressure liquid refrigerant and continues to absorb heat from the environment through the first finned heat exchanger.

[0075] It should be noted that the environment in which the dual-temperature water supply system is located and the environment in which the air source heat pump system is located are two separate spaces. Therefore, there is no air circulation or heat exchange between the two, and the ambient air temperature between them will not remain the same. The dual-temperature water supply system and the energy storage battery are located inside the energy storage container.

[0076] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An integrated thermal management system for dual-temperature water supply, characterized in that, It includes a plate heat exchanger (1), an air source heat pump system (2) located on one side of the plate heat exchanger (1), and a dual-temperature water supply system (3) located on the other side of the plate heat exchanger (1). The first inlet (101) of the plate heat exchanger (1) is connected to the dual-temperature water supply system (3), the first refrigerant outlet (111) of the plate heat exchanger is connected to the air source heat pump system (2), the first outlet (102) of the plate heat exchanger is connected to the dual-temperature water supply system (3), and the second refrigerant outlet (112) of the plate heat exchanger (1) is connected to the air source heat pump system (2). The first water inlet (101) and the first water outlet (102) are located on the same side of the plate heat exchanger (1) near the dual-temperature water supply system (3); the first refrigerant inlet (111) and the second refrigerant inlet (112) are located on the same side of the plate heat exchanger (1) near the air source heat pump system (2); The dual-temperature water supply system (3) includes a three-way valve (32) connected to the first inlet (101), a water pump (31) connected to the inlet (320) of the three-way valve (32), a second finned heat exchanger (33), an air-cooled circuit (34) and a water-cooled circuit (35) connected to the first outlet (102), and a return water pipe (36); the three-way valve (32) also includes a first outlet (321) and a second outlet (322); the first outlet (321) of the three-way valve is connected to the second finned heat exchanger (33); The inlet water temperature of the air-cooled circuit (34) is controlled at T. es =10℃~12℃, the inlet water temperature of the water-cooling circuit (35) is controlled at T ws =15℃~18℃; the air-cooled circuit (34) is connected to the air conditioner terminal and is used to keep the wet-bulb temperature of the environment where the battery pack is located lower than the temperature T of the water-cooled circuit (35). ws When the dual-temperature water supply system (3) is used to cool the energy storage battery and its surrounding environment, the water-cooled circuit (35) is used to cool the energy storage battery and the air-cooled circuit (34) is used to cool the environment; when the dual-temperature water supply system (3) is used to heat the energy storage battery and its surrounding environment, the water-cooled circuit (35) is used to heat the energy storage battery and the air-cooled circuit (34) is used to heat the environment; the return water of the air-cooled circuit (34) and the water-cooled circuit (35) are connected to the water pump (31) through the return water pipe (36).

2. The integrated thermal management system for dual-temperature water supply according to claim 1, characterized in that, The air source heat pump system (2) includes a reversing valve (21), a compressor (22), a first finned heat exchanger (23), and an expansion valve (24); the first refrigerant inlet (111) of the plate heat exchanger is connected to the expansion valve (24) of the air source heat pump system (2); the reversing valve (21) includes a first inlet (201), a second inlet (202), a third inlet (203), and a fourth inlet (204).

3. The integrated thermal management system for dual-temperature water supply according to claim 2, characterized in that, The second refrigerant inlet (112) of the plate heat exchanger (1) is connected to the third inlet (203) of the reversing valve (21) of the air source heat pump system. The fourth inlet (204) of the reversing valve (21) is connected to the first finned heat exchanger (23). The first inlet (201) and the second inlet (202) of the reversing valve (21) are connected to the outlet and inlet of the compressor (22), respectively.

4. The integrated thermal management system for dual-temperature water supply according to claim 3, characterized in that, The first outlet (102) of the plate heat exchanger is connected to the inlet pipes of the air-cooled circuit (34) and the water-cooled circuit (35) of the dual-temperature water supply system (3).

5. The integrated thermal management system for dual-temperature water supply according to claim 4, characterized in that, The first inlet (101) of the plate heat exchanger (1) is connected to the second outlet (322) of the three-way valve of the dual-temperature water supply system (3).

6. An integrated thermal management method for dual-temperature water supply using the system described in claim 5, characterized in that, Includes the following steps: S1: When the energy storage battery is in a charging or discharging state, the integrated thermal management system controlling the dual-temperature water supply is turned on, thereby cooling the energy storage battery and the air inside the energy storage container. S2: When the energy storage battery is idle, the water cooling circuit (35) is turned off, and the air cooling circuit (34) is controlled to operate according to the indoor ambient temperature, keeping the wet-bulb temperature of the ambient temperature lower than the temperature T of the water cooling circuit (35). ws ; S3: When the outdoor temperature of the container is below 10°C but above 0°C in winter, the air source heat pump system (2) is controlled to stop working, and the air provides the cooling capacity required for cooling the water in the water cooling circuit (35) through the second finned heat exchanger (33). S4: When the outdoor temperature of the container is below 0°C in winter, the air source heat pump system (2) is controlled to work in reverse in the initial stage to provide appropriate heat to the room, keep the air temperature inside the energy storage container above 0°C, and provide the cooling capacity required for cooling the water in the water cooling circuit (35) by the air through the second finned heat exchanger (33). S5: Control the system to switch between different combinations of cooling, heating and shutdown of the air source heat pump system (2) in real time according to the indoor and outdoor ambient temperature and the working status of the energy storage battery, so as to keep the system in the optimal state.

7. The integrated thermal management method for dual-temperature water supply according to claim 6, characterized in that, Step S1 includes the following steps: S11: Control the compressor (22) of the air source heat pump system (2) and the water pump (31) of the dual-temperature water supply system to start; S12: The return water in the air-cooled circuit (34) and the water-cooled circuit (35) passes through the inlet (320) of the water pump (31) and the three-way valve, and enters the first inlet (101) of the plate heat exchanger (1) through the three-way valve (32); at the same time, the low-temperature and low-pressure liquid refrigerant in the air source heat pump system (2) enters the first refrigerant flow port (111) of the plate heat exchanger (1); the return water in the air-cooled circuit (34) and the water-cooled circuit (35) is cooled in the plate heat exchanger (1) by the low-temperature and low-pressure liquid refrigerant entering the plate heat exchanger (1) from the air source heat pump system (2), and the cooled water is cooled down by the low-temperature and low-pressure liquid refrigerant entering the plate heat exchanger (1) from the air source heat pump system (2). The return water returns to the dual-temperature water supply system (3) through the first outlet (102) of the plate heat exchanger to cool the air inside the battery and energy storage container; the low-temperature and low-pressure liquid refrigerant flowing into the plate heat exchanger (1) in the air source heat pump system (2) evaporates into low-temperature and low-pressure refrigerant vapor after absorbing heat through heat exchange with the return water entering the air-cooled circuit (34) and water-cooled circuit (35) through the first inlet (101) in the plate heat exchanger (1), and the low-temperature and low-pressure refrigerant vapor enters the air source heat pump system through the second refrigerant flow port (112) of the plate heat exchanger; S13: The low-temperature, low-pressure refrigerant vapor that enters the air source heat pump system (2) in step S12 enters the compressor (22) through the third flow port (203) of the reversing valve (21) and the second flow port (202) of the reversing valve (21). After being compressed into high-temperature, high-pressure refrigerant vapor, it enters the first finned heat exchanger (23) through the first flow port (201) of the reversing valve (21) and the fourth flow port (204) of the reversing valve (21). In the first finned heat exchanger (23), it exchanges heat with the outside air of the energy storage container. The high-temperature, high-pressure refrigerant vapor releases heat and undergoes a phase change. After being condensed into high-temperature, high-pressure liquid refrigerant, it passes through the expansion valve (24) and becomes low-temperature, low-pressure liquid refrigerant. It flows through the first refrigerant flow port (111) and enters the plate heat exchanger (1), where it is used again to cool the return water of the dual-temperature water supply system (3).

8. The integrated thermal management method for dual-temperature water supply according to claim 7, characterized in that, In step S4, when the outdoor temperature of the container is below 0°C in winter, the air source heat pump system (2) is controlled to work in reverse at the initial stage to provide appropriate heat to the room, maintain the air temperature inside the energy storage container above 0°C, and provide the cooling capacity required for cooling the water in the water-cooled circuit (35) by the air through the second finned heat exchanger (33), including the following steps: S41: Control the reversing valve (21) in the air source heat pump system (2) to switch the third flow port (203) and the fourth flow port (204) to switch, and at the same time control the first flow port (201) to switch to be connected to the third flow port (203) and the fourth flow port (204) to switch to be connected to the second flow port (202). Then, the refrigerant in the plate heat exchanger (1) flows out through the first refrigerant flow port (111), flows through the expansion valve (24), the first finned heat exchanger (23), the compressor (22) and the reversing valve (21) in sequence, and then enters the plate heat exchanger (1) again through the second refrigerant flow port (112). S42: Control the compressor (22) of the air source heat pump system (2) to start; the low-temperature and low-pressure liquid refrigerant in the air source heat pump system (2) absorbs heat from the outside air in the first finned heat exchanger (23) and vaporizes into low-temperature and low-pressure refrigerant vapor. The low-temperature and low-pressure refrigerant vapor enters the compressor (22) through the fourth flow port (204) of the reversing valve (21) and the second flow port (202) of the reversing valve (21). After being compressed into high-temperature and high-pressure refrigerant vapor, it flows out from the compressor (22), enters the reversing valve (21) again through the first flow port (201), flows out from the third flow port (203) of the reversing valve (21), and enters the plate heat exchanger (1) through the second refrigerant flow port (112). S43: After the warm water in the air-cooled circuit (34) and water-cooled circuit (35) of the dual-temperature water supply system (3) heats the environment, it enters the plate heat exchanger (1) through the first inlet (101) of the plate heat exchanger (1) via the return water pipe (36), the water pump (31) and the second outlet (322) of the three-way valve; the high-temperature and high-pressure refrigerant vapor entering the plate heat exchanger (1) exchanges heat with the return water of the dual-temperature water supply system (3) entering the plate heat exchanger through the first inlet (101) in the plate heat exchanger (1); The high-temperature and high-pressure refrigerant vapor releases heat and condenses, becoming a high-temperature and high-pressure liquid refrigerant, which then enters the air source heat pump system through the first refrigerant flow port (111); the return water of the dual-temperature water supply system (3) absorbs heat after entering the plate heat exchanger, and then returns to the dual-temperature water supply system (3) through the first water outlet (102) to heat the air inside the battery and energy storage container; ensuring that the temperature inside the battery and energy storage container is kept above 0°C, so as to avoid the battery efficiency being low or even shortening its service life due to excessively low temperature; S44: The high-temperature and high-pressure liquid refrigerant that enters the air source heat pump system (2) through the first refrigerant flow port (111) in step S43 becomes a low-temperature and low-pressure liquid refrigerant after being processed by the expansion valve (24); the low-temperature and low-pressure liquid refrigerant enters the first finned heat exchanger (23) to continue absorbing heat from the outside air of the container and start the next heating cycle.

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