Heat dissipation assembly, thermal management system, and energy storage system

Abstract

The application provides a heat dissipation assembly, a thermal management system and an energy storage system. The heat dissipation assembly comprises an immersion tank and a condenser; the immersion tank has an immersion cavity, and an immersion liquid is arranged in the immersion cavity; the condenser is arranged in the immersion tank and immersed in the immersion liquid; and the condenser has a medium end pipe which penetrates out of the immersion tank. The condenser is cooled by the immersion liquid, so that the fan can be cancelled to eliminate the noise caused by the fan, thereby reducing the noise of the energy storage system.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a heat dissipation assembly, a thermal management system, and an energy storage system. Background Technology

[0002] In related technologies, battery energy storage systems are systems that use battery packs as the core energy storage carrier, achieving flexible energy dispatch through the storage and release of electrical energy. During charging and discharging, the battery cells within the battery pack undergo chemical reactions, continuously generating heat. Excessive cell operating temperature reduces cell performance and affects the lifespan of the energy storage system. Therefore, a thermal management system is required for the battery pack. Currently, the mainstream thermal management system used in energy storage systems is bottom liquid cooling. Low-temperature coolant circulates into the battery pack and, after passing through a liquid cooling plate at the bottom of the pack, carries away the heat dissipated by the battery pack, thus continuously cooling the battery pack.

[0003] In thermal management systems, liquid chillers provide power for the continuous circulation of coolant and regulate its temperature. Liquid chillers generate noise during operation, and this noise is the primary source of noise in energy storage systems. However, the market has strict requirements for the noise levels of energy storage systems. For example, the noise level of an energy storage system must be less than 45 dB during nighttime operation. Taking a 5MWh energy storage system as an example, this system typically requires a liquid chiller with a heat exchange capacity of 60 kW, resulting in a noise level between 75 dB and 80 dB. This leads to a relatively high noise level, making it difficult to meet market requirements. Utility Model Content

[0004] Embodiments of this application provide a heat dissipation assembly, a thermal management system, and an energy storage system, which can improve the problem of excessive operating noise in energy storage systems.

[0005] In a first aspect, embodiments of this application provide a heat dissipation assembly, comprising: An immersion tank having an immersion chamber in which an immersion liquid is disposed; and A condenser is disposed in the immersion tank and immersed in the immersion liquid; the condenser has a medium end pipe that extends out of the immersion tank.

[0006] In some embodiments, the immersion liquid comprises a phase change material.

[0007] In some embodiments, the phase change material is a solid-liquid phase change material.

[0008] In some embodiments, the phase change material is paraffin.

[0009] In some embodiments, the heat dissipation assembly further includes a plurality of support frames disposed in the immersion chamber, the plurality of support frames connecting the condenser and the immersion tank to support the immersion tank above the bottom wall of the immersion tank.

[0010] In some embodiments, the heat dissipation assembly further includes a plurality of heat-conducting wires, all of which are disposed in the immersion chamber and connected to the immersion tank and the condenser.

[0011] In some embodiments, the heat-conducting wire has a spiral structure; And / or, the heat-conducting wire is an aluminum wire.

[0012] In some embodiments, the support frame includes support legs and a support beam. The two ends of the support legs are connected to the bottom wall of the immersion tank and the support beam, respectively. A stepped groove is provided on the side of the support beam away from the support legs, and a portion of the condenser is inserted into the stepped groove.

[0013] In some embodiments, a heat-conducting sheet is provided on the inner surface of the stepped groove, and the heat-conducting sheet is in contact with the condenser.

[0014] In some embodiments, the heat-conducting sheet is an aluminum sheet; And / or, a through groove is provided on the surface of the heat-conducting plate facing the condenser, and the groove port is in communication with the immersion chamber.

[0015] In some embodiments, the heat dissipation assembly further includes a housing, a bidirectional hydraulic pump, a first shut-off valve, and a water tank. The housing covers the immersion tank and defines a space between the housing and the immersion tank. The bidirectional hydraulic pump is connected to the space and the water tank via pipelines. The first shut-off valve is disposed on the pipeline between the bidirectional hydraulic pump and the space.

[0016] In some embodiments, the heat dissipation assembly further includes a vent pipe and a second shut-off valve. The vent pipe is connected to the housing, and its two ends are respectively connected to the partition space and the external environment of the housing. The second shut-off valve is disposed on the vent pipe.

[0017] In some embodiments, the heat dissipation assembly further includes a vacuum pump and a third shut-off valve, wherein the vacuum pump is connected to the partition space via a pipeline, and the third shut-off valve is disposed on the pipeline between the vacuum pump and the partition space.

[0018] Secondly, embodiments of this application provide a thermal management system, including: compressor; The aforementioned heat assembly, wherein one of the medium end pipes of the condenser is connected to one end of the compressor; and The heat exchanger has a first heat exchange channel and a second heat exchange channel, the first heat exchange channel being connected to another medium end pipe of the condenser and another end of the compressor, and the second heat exchange channel being configured to communicate with a heat transfer device.

[0019] Thirdly, embodiments of this application provide an energy storage system, comprising: Battery pack, with heat transfer device; and In the aforementioned thermal management system, the second heat exchange channel is connected to the heat transfer device.

[0020] The beneficial effects of the embodiments of this application are as follows: In the embodiments of this application, the condenser is cooled by immersing it in a liquid, thereby eliminating the need for a fan and reducing the noise from the fan, which in turn reduces the noise of the energy storage system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a thermal management system in related technologies; Figure 2 This is a schematic diagram of the heat dissipation assembly provided in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the application of the heat dissipation assembly provided in an embodiment of this application; Figure 4 This is a schematic diagram of another heat dissipation assembly provided in an embodiment of this application; Figure 5 yes Figure 4 A magnified structural diagram of part A in the middle; Figure 6 This is a schematic diagram of another heat dissipation assembly provided in an embodiment of this application; Figure 7 This is a schematic diagram of a portion of the piping structure of the heat dissipation assembly provided in an embodiment of this application; Figure 8 This is a schematic diagram of the piping structure of another part of the heat dissipation assembly provided in the embodiments of this application; Figure 9 This is a schematic diagram of the structure of the thermal management system provided in an embodiment of this application; Figure 10 This is a structural block diagram of an energy storage system provided in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures: 1- Thermal management system; 11-Condenser; 111-Medium end pipe; 30 - Heat exchanger; 31 - First heat exchange channel; 32 - Second heat exchange channel; 13-Compressor; 15-Water pump; 16-Expansion tank; 17-High-pressure liquid receiver; 18-Electronic expansion valve; 19-Pressure sensor; 40 - Data acquisition component; 41 - Temperature sensor; 42 - PTC heater; 43 - Liquid chiller; 44 - Centralized liquid chiller; 2-Energy storage system; 3-Battery pack; 301-Heat transfer device.

[0024] 50-Heat dissipation assembly; 51-Immersion tank; 511-Immersion chamber; 512-Bottom wall; 52-Immersion liquid; 53-Phase change material; 54-Support frame; 541-Support leg; 542-Support beam; 5421-Step groove; 543-Heat conductive plate; 5431-Through groove; 55 - Heat-conducting wire; 561-Outer casing; 5611-Gap space; 562-Bidirectional hydraulic pump; 563-First shut-off valve; 564-Water tank; 571 - Vent pipe; 572 - Second shut-off valve; 581 - Vacuum pump; 582 - Third shut-off valve. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0028] Before introducing the heat dissipation assembly, thermal management system and energy storage system provided in the embodiments of this application, the relevant technologies of this application will be introduced first.

[0029] like Figure 1 As shown, the thermal management system of the energy storage system includes a liquid chiller and a PTC (Positive Temperature Coefficient) heater. The liquid chiller comprises a compressor, a condenser, a high-pressure liquid receiver, an expansion valve, and a heat exchanger, all connected in a loop via piping. One flow channel within the heat exchanger connects to the compressor inlet, while the other flow channel connects to the liquid inlet and outlet of the liquid cooling plate, respectively. The PTC heater also has flow channels, with both ends connected to the liquid inlet and outlet of the liquid cooling plate. Depending on the specific needs, either the flow channel of the PTC heater or the flow channel within the plate heat exchanger is selected to connect to the liquid cooling plate. For example, when cooling the battery pack is required, the PTC heater is disconnected, and the fluid in the flow channel of the heat exchanger connected to the compressor cools the fluid in the flow channel of the heat exchanger connected to the liquid cooling plate, thus introducing low-temperature coolant to the liquid cooling plate and cooling the battery pack. For example, when it is necessary to heat up the battery pack, the liquid cooler is disconnected, and the fluid in the flow channel of the PTC is heated by the PTC heater to input a higher temperature immersion liquid into the liquid cooling plate, thereby heating up the battery pack.

[0030] The noise from the liquid chiller primarily originates from the fan, compressor, and water pump. Because the fan needs to continuously cool the condenser of the liquid chiller to dissipate heat, cooling the high-temperature, high-pressure coolant from the compressor and thus continuously supplying low-temperature coolant to the liquid cooling plates, the fan requires high-speed operation. This results in significant aerodynamic and mechanical vibration noise from the fan, which is the main source of noise in the energy storage system.

[0031] The fan speed is directly proportional to the heat removed from the condenser. Therefore, the higher the condenser's heat exchange efficiency, the higher the fan speed, and the greater the noise generated by the fan. Correspondingly, the noise of the energy storage system will also be greater. Thus, given the limited heat exchange power of the liquid chiller, fan noise can be reduced by enhancing the condenser's heat exchange capacity and lowering the fan speed.

[0032] Based on this, embodiments of this application provide a heat dissipation assembly, a thermal management system, and an energy storage system, which can reduce the noise of the energy storage system while ensuring the heat dissipation efficiency of the condenser, so as to meet the relevant application requirements of the energy storage system.

[0033] The following combination Figures 2 to 10 The present application provides a detailed description of a heat dissipation assembly 50, a thermal management system 1, and an energy storage system 2 provided in the embodiments of this application.

[0034] In a first aspect, embodiments of this application provide a heat dissipation assembly 50, which includes an immersion tank 51 and a condenser 11. The immersion tank 51 has an immersion cavity 511 in which an immersion liquid 52 is disposed. The condenser 11 is disposed within the immersion tank 51 and is immersed in the immersion liquid 52. The condenser 11 has a medium end pipe 111 extending out of the immersion tank 51.

[0035] It is understandable that the immersion liquid 52 should meet the characteristics of high thermal conductivity, chemical stability, non-flammability and low toxicity, and at the same time, it should be compatible with the material of the condenser 11 and should not corrode the condenser 11.

[0036] It is understandable that the specific heat capacity of the immersion liquid 52 is greater than that of air. For example, the specific heat capacity of the immersion liquid 52 is 1.8 kJ / kg·K ~ 2 kJ / kg·K.

[0037] For example, the immersion fluid 52 can be refined mineral oil, such as transformer oil or heat transfer oil. The immersion fluid 52 can also be a fluorinated fluid, such as a perfluorocarbon or hydrofluoroether. The immersion fluid 52 can also be a silicone oil, water, or a water-based coolant. For example, a mixture of deionized water, ethylene glycol, and silicate preservatives can be used as the immersion fluid 52.

[0038] Taking the 0.5 P charge / discharge condition of the 5 MWh energy storage system 2 as an example, the fluid temperature at the outlet of condenser 11 can be set to 20℃ or 25℃, etc., as required. The heat exchange power of the liquid chiller 43 corresponding to the energy storage system 2 is 60 kW. The total charging and discharging time of the energy storage system 2 is 4 hours, therefore the maximum energy required for the charging and discharging process of the energy storage system 2 is 4 × 60 kW = 240 kWh. Therefore, the heat Q = 240 kWh. After converting the heat unit to "kJ", Q = 240 × 3.6 × 10 6 J = 240 × 3600 kJ = 8.64 × 10 5 kJ.

[0039] The specific heat capacity c of the immersion liquid 52 is set to 2 kJ / kg·K, and the temperature Δt of the immersion liquid 52 before and after completing the heat exchange Q is 5℃.

[0040] According to the heat calculation formula: Q = cmΔt (where Q is the heat, c is the specific heat capacity of the immersion liquid 52, m is the mass of the immersion liquid 52, and Δt is the temperature difference, which is the amount of heat change, during the heat absorption or release process), we get: Q = 8.64 × 10 5 kJ = 2 kJ / kg·K × m × 5℃, which calculates to a mass m = 86400 kg for the immersion liquid 52. Therefore, the mass of the immersion liquid 52 with a specific heat capacity of 2 kJ / kg·K, which completes a heat exchange of 240 kWh and has a temperature change of 5℃ before and after the heat exchange, is 86400 kg.

[0041] For example, the immersion liquid 52 is a heat transfer oil with a specific heat capacity c of 2 kJ / kg·K. When its mass is 86,400 kg, it occupies a space of approximately 100 m². 3 Therefore, the immersion tank 51 has a relatively large volume. In this case, the heat dissipation assembly 50 can be used in scenarios such as centralized liquid cooling systems in energy storage power stations, for example... Figure 3 As shown. Figure 3 In the middle, the liquid chillers 43 of multiple energy storage systems 2 are concentrated in one place to form a centralized liquid chiller 44.

[0042] It is understandable that during the charging and discharging of the energy storage system 2, the fluid in the heat transfer device 301 (e.g., a liquid cooling plate) needs to be cooled by the liquid chiller 43. The condenser 11 of the liquid chiller 43 is immersed in the immersion liquid 52. The immersion liquid 52 absorbs heat from the condenser 11 to cool the coolant inside the condenser 11, thereby cooling the fluid in the heat transfer device 301. When the ambient temperature of the heat dissipation assembly 50 is lower than the temperature of the immersion liquid 52, the heat dissipation assembly 50 directly dissipates heat to the external environment, thus achieving cooling of the immersion liquid 52.

[0043] In this embodiment, the condenser 11 is cooled by immersing it in immersion liquid 52, thereby eliminating the need for a fan and reducing the noise generated by the fan. This reduces the noise of the energy storage system 2 and meets the relevant application requirements of the energy storage system 2.

[0044] In addition, compared with air cooling, this embodiment uses immersion liquid 52 to immerse the condenser 11 to dissipate heat and cool it down, which can improve the heat dissipation efficiency of the condenser 11.

[0045] In some embodiments, such as Figure 2 As shown, the immersion fluid 52 contains a phase change material 53. Thus, without increasing the amount of immersion fluid 52 used, the amount of heat that the immersion fluid 52 can absorb can be increased. This allows for a reduction in the amount of immersion fluid 52 used, thereby reducing the volume of the heat dissipation assembly 50.

[0046] This is understandable. Phase change materials (53) refer to materials that, when undergoing a phase change at a specific temperature (such as solid → liquid, liquid → gas, solid → solid), can absorb or release a large amount of heat (i.e., "latent heat") while maintaining a relatively constant temperature. Their core characteristic is the storage and release of energy through a phase change process, thereby achieving temperature regulation.

[0047] Furthermore, the latent heat of phase change materials (PCMs) is much greater than the sensible heat of conventional materials (i.e., the heat absorbed or released when the temperature changes) during the phase change process. Moreover, the temperature of PCMs near the phase change point is small and almost constant. At the same time, the phase change process of PCMs is reversible, and they can maintain stable energy storage performance and chemical stability after multiple phase change cycles.

[0048] For example, the phase change material 53 may be a paraffin (e.g., hexadecane, heptadecane, octadecane, eicosane, or a mixture thereof), a fatty acid (e.g., stearic acid, palmitic acid, myristic acid), or polyethylene glycol.

[0049] For example, paraffin microparticles can be introduced into the immersion liquid 52. The phase transition temperature of paraffin can be adjusted between 8°C and 80°C, and is generally between 160 and 270 kJ / kg. In this way, the latent heat of phase transition of the mixture of immersion liquid 52 and paraffin can reach 120 kJ / kg.

[0050] In some embodiments, such as Figure 2 As shown, the phase change material 53 is a solid-liquid phase change material. In this way, the latent heat density of the mixture of the immersion liquid 52 and the phase change material 53 can be increased, thereby improving the heat dissipation efficiency of the condenser 11.

[0051] It is understandable that solid-liquid phase change materials are a class of functional materials that can absorb or release a large amount of latent heat (i.e., latent heat of phase change) through a phase change between solid and liquid states at a specific temperature, while their own temperature remains basically unchanged.

[0052] For example, solid-liquid phase change materials can be organic, such as paraffin, fatty acids (e.g., stearic acid), or polyethylene glycol; they can also be inorganic, such as hydrated salts; or they can be composites, such as a mixture of organic and inorganic phase change materials, for example, organic or inorganic phase change materials doped with nanoparticles.

[0053] In some embodiments, the phase change material 53 is paraffin wax. This allows the phase change material 53 to have good latent heat of phase change and a wide phase change temperature range, making it highly adaptable.

[0054] Please see Figure 4In some embodiments, the heat dissipation assembly 50 further includes a plurality of support frames 54. The plurality of support frames 54 are disposed in the immersion chamber 511. The plurality of support frames 54 connect the condenser 11 and the immersion chamber 51 to support the immersion chamber 51 above the bottom wall 512 of the immersion chamber 51. Thus, the condenser 11 can be supported within the immersion chamber 51 by the support frames 54, so that the condenser 11 is surrounded by the immersion liquid 52, thereby increasing the uniformity of the distribution of the immersion liquid 52 around the condenser 11 and improving the heat dissipation efficiency of the condenser 11.

[0055] Specifically, multiple support frames 54 support the immersion tank 51 at the center of the immersion tank 51.

[0056] It is understandable that the condenser 11 can also be directly hung in the immersion tank 51 through the medium end pipe 111.

[0057] Please see Figure 4 In some embodiments, the heat dissipation assembly 50 further includes a plurality of heat-conducting wires 55. The plurality of heat-conducting wires 55 are disposed in the immersion chamber 511 and connected to the immersion tank 51 and the condenser 11. Thus, heat around the condenser 11 can be quickly transferred to the immersion liquid 52 near the immersion tank 51 via the heat-conducting wires 55, thereby improving the heat dissipation efficiency of the condenser 11.

[0058] Please see Figure 4 In some embodiments, the heat-conducting wire 55 has a spiral structure. This allows the heat-conducting wire 55 to have a larger surface area for the same length, thereby increasing the heat exchange efficiency between the heat-conducting wire 55 and the immersion liquid 52.

[0059] In some embodiments, the heat-conducting wire 55 is an aluminum wire. This allows the heat-conducting wire 55 to have both good thermal conductivity and good corrosion resistance as well as ease of forming.

[0060] Please see Figure 4 In some embodiments, the support frame 54 includes support legs 541 and support beams 542. The two ends of the support legs 541 are connected to the bottom wall 512 of the immersion tank 51 and the support beam 542, respectively. A stepped groove 5421 is provided on the side of the support beam 542 facing away from the support legs 541. A portion of the condenser 11 is inserted into the stepped groove 5421. This increases the mating area between the support frame 54 and the condenser 11, thereby improving the stability of the support frame 54 in supporting the condenser 11.

[0061] For example, there are two support frames 54, and the two support frames 54 are mirror images of each other.

[0062] In some embodiments, such as Figure 5As shown, a heat-conducting plate 543 is provided on the inner surface of the stepped groove 5421. The heat-conducting plate 543 is in contact with the condenser 11. In this way, the heat exchange efficiency between the surface of the condenser 11 in contact with the support frame 54 and the immersion liquid 52 can be improved by the heat-conducting plate 543.

[0063] In some embodiments, the heat-conducting sheet 543 is an aluminum sheet. This allows the heat-conducting sheet 543 to have both good thermal conductivity and good corrosion resistance as well as ease of forming.

[0064] In some embodiments, such as Figure 5 As shown, a through groove 5431 is provided on the surface of the heat-conducting plate 543 facing the condenser 11, and the groove port of the through groove 5431 is connected to the immersion chamber 511. In this way, the contact area between the condenser 11 and the immersion liquid 52 can be increased to improve the heat exchange efficiency.

[0065] In some embodiments, such as Figure 6 and Figure 7 As shown, the heat dissipation assembly 50 also includes a housing 561, a bidirectional hydraulic pump 562, a first shut-off valve 563, and a water tank 564. The housing 561 encloses the immersion tank 51, and a space 5611 is defined between the housing 561 and the immersion tank 51. The bidirectional hydraulic pump 562 is connected to the space 5611 and the water tank 564 via pipelines. The first shut-off valve 563 is disposed on the pipeline between the bidirectional hydraulic pump 562 and the space 5611.

[0066] It is understood that the first shut-off valve 563 can be an electronic valve. Thus, the operating state of the bidirectional hydraulic pump 562 and the first shut-off valve 563 can be controlled by the controller to achieve automatic control.

[0067] It can be understood that the bidirectional hydraulic pump 562 is a hydraulic power component that can realize bidirectional oil suction and discharge. That is, by changing the pump's rotation direction (or switching its internal structure), the output direction of the hydraulic oil can be flexibly changed, thereby driving hydraulic actuators (such as hydraulic cylinders and hydraulic motors) to achieve forward and reverse movements.

[0068] The space 5611 may be filled with liquid, such as heat transfer oil.

[0069] Specifically, when heat exchange between the immersion liquid 52 and the external environment of the heat dissipation assembly 50 is not required, the liquid in the partition space 5611 can be pumped into the water tank 564 for temporary storage by the bidirectional hydraulic pump 562, so that the outer periphery of the immersion tank 51 is successively covered by air and the outer shell 561, thereby slowing down the heat exchange efficiency between the immersion liquid 52 and the external environment of the heat dissipation assembly 50.

[0070] For example, when the external ambient temperature of the heat dissipation assembly 50 is high and the battery pack 3 needs to be cooled by the heat dissipation assembly 50, the liquid in the partition space 5611 can be pumped away by the bidirectional hydraulic pump 562 to slow down the heat exchange efficiency between the immersion liquid 52 and the external environment of the heat dissipation assembly 50, so that the immersion liquid 52 can absorb more heat from the battery pack 3.

[0071] Specifically, when the immersion liquid 52 needs to exchange heat with the external environment of the heat dissipation assembly 50 to cool down the immersion liquid 52, the liquid in the water tank 564 can be pumped into the space 5611 by the bidirectional hydraulic pump 562, so that the outer periphery of the immersion tank 51 is successively covered by the liquid and the outer shell 561, thereby improving the heat exchange efficiency between the immersion liquid 52 and the external environment of the heat dissipation assembly 50.

[0072] For example, when the external ambient temperature of the heat dissipation assembly 50 is low and the immersion fluid 52 needs to be cooled by the external environment, the liquid in the partition space 5611 can be pumped away by the bidirectional hydraulic pump 562 to slow down the heat exchange efficiency between the immersion fluid 52 and the external environment of the heat dissipation assembly 50, so that the immersion fluid 52 can absorb more heat from the battery pack 3.

[0073] For example, in regions with large diurnal temperature variations, to address the need for nighttime heating of the battery pack 3, the amount of liquid filling the interstitial space 5611 can be controlled after the immersion fluid 52 absorbs heat during the day, thereby controlling the heat dissipation rate of the heat dissipation assembly 50. Thus, when the energy storage system 2 needs to be started at low temperatures, the liquid in the condenser 11 can be heated by the immersion fluid 52, thereby heating the battery pack 3 without the need for additional heating devices.

[0074] In some embodiments, such as Figure 8 As shown, the heat dissipation assembly 50 also includes a vent pipe 571 and a second shut-off valve 572. The vent pipe 571 is connected to the housing 561. Both ends of the vent pipe 571 are connected to the partition space 5611 and the external environment of the housing 561, respectively. The second shut-off valve 572 is disposed on the vent pipe 571. Thus, when liquid is supplied to the partition space 5611 by the bidirectional hydraulic pump 562 or when liquid is extracted from the partition space 5611, the second shut-off valve 572 can be opened to discharge gas from the partition space 5611 or to supply air from the outside into the partition space 5611, thereby balancing the air pressure within the partition space 5611 and improving the working efficiency of the bidirectional hydraulic pump 562.

[0075] It is understandable that the second shut-off valve 572 could be an electronic valve to enhance the automation of the heat dissipation assembly 50.

[0076] In some embodiments, such as Figure 8As shown, the heat dissipation assembly 50 also includes a vacuum pump 581 and a third shut-off valve 582. The vacuum pump 581 is connected to the partition space 5611 via a pipe. The third shut-off valve 582 is disposed on the pipe between the vacuum pump 581 and the partition space 5611.

[0077] Specifically, when heat exchange between the immersion fluid 52 and the external environment of the heat dissipation assembly 50 is not required, the liquid in the partition space 5611 can be temporarily pumped into the water tank 564 by the bidirectional hydraulic pump 562, so that the outer periphery of the immersion tank 51 is successively covered by air and the outer shell 561. Then, the air in the partition space 5611 is removed by the vacuum pump 581, thereby reducing the air volume in the partition space 5611 and slowing down the heat exchange efficiency between the immersion fluid 52 and the external environment of the heat dissipation assembly 50.

[0078] It is understandable that the second shut-off valve 572 is in the closed state when the vacuum pump 581 is working.

[0079] Secondly, such as Figure 9 As shown, an embodiment of this application provides a thermal management system 1, which includes a compressor 13, a heat exchanger 30, and the aforementioned heat dissipation assembly 50. A medium end pipe 111 of the condenser 11 is connected to one end of the compressor 13. The heat exchanger 30 has a first heat exchange channel 31 and a second heat exchange channel 32. The first heat exchange channel 31 connects the other medium end pipe 111 of the condenser 11 and the other end of the compressor 13. The second heat exchange channel 32 is configured to communicate with a heat transfer device 301. Specifically, the second heat exchange channel 32 is configured to be connected in series with a liquid cooling plate.

[0080] It can be understood that the compressor 13, the first heat exchanger 30, and the condenser 11 form the first loop. The working medium in the first loop can be a refrigerant.

[0081] Compressor 13 can compress low-pressure, low-temperature gaseous refrigerant into high-pressure, high-temperature gaseous refrigerant, providing power for the refrigerant's circulation in the system and enhancing its heat release capacity. For example, compressor 13 compresses the gaseous refrigerant by means of the movement of a piston, rotor, or scroll, reducing its volume. According to thermodynamic principles, when a gas is compressed, its internal energy increases, and its pressure and temperature rise sharply, eventually becoming a high-pressure, high-temperature superheated gaseous refrigerant. The high-pressure, high-temperature gaseous refrigerant is then discharged into condenser 11.

[0082] The condenser 11 cools the high-pressure, high-temperature gaseous refrigerant discharged from the compressor 13 through a fan, atomizer, etc., so as to condense it into a high-pressure, medium-temperature liquid refrigerant and release heat.

[0083] The operation of condenser 11 can be divided into a heat dissipation process and a condensation process. During the heat dissipation process, the high-pressure, high-temperature gaseous refrigerant enters condenser 11 and exchanges heat with the external environment through condenser 11 for condensation. As the heat of the refrigerant is continuously released, the refrigerant temperature gradually decreases to the condensation temperature, changing from a gaseous state to a liquid state. This phase change process releases a large amount of latent heat. Ultimately, the refrigerant becomes a high-pressure, medium-temperature liquid refrigerant. The liquid refrigerant flows out through the outlet of condenser 11 and into heat exchanger 30 to dissipate heat and cool the heat exchange medium from heat transfer device 301, thereby cooling the battery pack 3 through the cooling plate.

[0084] It is understood that the thermal management system 1 includes the aforementioned heat dissipation assembly 50, and the thermal management system 1 has all the beneficial effects of the heat dissipation assembly 50, which will not be repeated here in this embodiment.

[0085] In some embodiments, such as Figure 9 As shown, the thermal management system 1 also includes a water pump 15. The water pump 15 is connected in series with the second flow channel.

[0086] The water pump 15 is used to convert mechanical energy into fluid kinetic energy and pressure to drive the refrigerant to flow in the pipeline.

[0087] In some embodiments, such as Figure 9 As shown, the thermal management system 1 also includes a data acquisition component 40. There are two data acquisition components 40, which are respectively disposed at both ends of the second heat exchange channel 32. The data acquisition components 40 are used to acquire at least one of the fluid's temperature and pressure information.

[0088] For example, the acquisition component 40 includes a pressure sensor 19 and a temperature sensor 41. The pressure sensor 19 is used to acquire pressure information of the fluid in the pipeline and provide a feedback signal to the energy storage system 2. The temperature sensor 41 is used to acquire temperature information of the fluid in the pipeline and provide a feedback signal to the energy storage system 2.

[0089] Temperature sensors 41 are installed at both ends of the second heat exchange channel 32 to obtain the temperature of the fluid flowing into the heat transfer device 301, the temperature of the fluid flowing out of the heat transfer device 301, and the difference between them. This helps the control system to determine whether the thermal management system 1 is working properly and to understand the operation of the battery pack 3.

[0090] Pressure sensors 19 are installed at both ends of the second heat exchange channel 32 to obtain the pressure of the fluid flowing into the heat transfer device 301, the pressure of the fluid flowing out of the heat transfer device 301, and the difference between them, so as to help the control system determine whether the heat management system 1 is working properly and whether there is any leakage.

[0091] In some embodiments, such as Figure 9 As shown, the thermal management system 1 also includes a high-pressure liquid receiver 17 and an electronic expansion valve 18 connected between the condenser 11 and the heat exchanger 30. The electronic expansion valve 18 is located between the high-pressure liquid receiver 17 and the heat exchanger 30.

[0092] The high-pressure liquid receiver 17 is used to store the high-pressure liquid refrigerant discharged from the condenser 11 and plays a role in regulating and buffering the refrigerant flow rate in the system. The high-pressure liquid receiver 17 can balance the supply and demand of refrigerant, that is, store excess liquid refrigerant; at the same time, it supplies liquid refrigerant when demand increases, ensuring the efficient operation of the thermal management system 1.

[0093] The electronic expansion valve 18 is used to control the refrigerant flow rate. The electronic expansion valve 18 is driven by an electrical signal to precisely regulate the refrigerant flow rate entering the heat exchanger 30. For example, when the heat generation of the battery pack 3 increases, the refrigerant flow rate can be increased to improve the heat exchange efficiency of the battery pack 3.

[0094] In some embodiments, heat exchanger 30 is a plate heat exchanger. Plate heat exchangers use metal plates (e.g., stainless steel, titanium alloy, copper, etc.) as the heat transfer medium to achieve heat transfer between two or more fluids.

[0095] Thirdly, such as Figure 10 As shown, an embodiment of this application provides an energy storage system 2, which includes a battery pack 3 and the aforementioned thermal management system 1. The battery pack 3 has a heat transfer device 301; the aforementioned thermal management system 1 has a second heat exchange channel 32 connected to a channel within the heat transfer device 301. Specifically, the second heat exchange channel 32 is connected in series with a liquid cooling plate.

[0096] Energy storage system 2 can be applied in both power storage and commercial / industrial energy storage scenarios. Taking power storage as an example, energy storage system 2 is primarily used to promote the stability of the entire power grid. For instance, energy storage system 2 can increase the proportion of renewable and clean energy sources such as wind and solar power in the power grid. When the power generation from solar and wind power is large, the power load in the grid cannot be absorbed, which will impact the grid. Therefore, excess energy needs to be stored in energy storage system 2 to maintain the grid in a balanced and stable state. If the power generation from solar and wind power is insufficient, the grid cannot meet the power demand of the load, and energy storage system 2 needs to release electricity to ensure power supply.

[0097] An expansion tank 16 is provided between the water pump 15 and the heat transfer device 301. The expansion tank 16 is used to balance the pressure of the fluid in the pipeline and prevent pressure fluctuations caused by temperature changes.

[0098] It is understood that the energy storage system 2 includes the aforementioned heat dissipation assembly 50, and the energy storage system 2 has all the beneficial effects of the heat dissipation assembly 50, which will not be described again in this embodiment.

[0099] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A heat dissipation assembly (50), characterized in that, include: An immersion tank (51) has an immersion chamber (511) in which an immersion liquid (52) is provided; as well as A condenser (11) is disposed in the immersion tank (51) and immersed in the immersion liquid (52); the condenser (11) has a medium end pipe (111) that extends out of the immersion tank (51).

2. The heat dissipation assembly (50) according to claim 1, characterized in that, The immersion liquid (52) includes a phase change material (53).

3. The heat dissipation assembly (50) according to claim 2, characterized in that, The phase change material (53) is a solid-liquid phase change material.

4. The heat dissipation assembly (50) according to claim 2, characterized in that, The phase change material (53) is paraffin wax.

5. The heat dissipation assembly (50) according to any one of claims 1-4, characterized in that, The heat dissipation assembly (50) also includes a plurality of support frames (54) disposed in the immersion chamber (511). The plurality of support frames (54) connect the condenser (11) and the immersion tank (51) to support the immersion tank (51) above the bottom wall (512) of the immersion tank (51).

6. The heat dissipation assembly (50) according to claim 5, characterized in that, The heat dissipation assembly (50) also includes a plurality of heat-conducting wires (55), which are all disposed in the immersion chamber (511) and connected to the immersion tank (51) and the condenser (11).

7. The heat dissipation assembly (50) according to claim 6, characterized in that, The heat-conducting wire (55) has a spiral structure; And / or, the heat-conducting wire (55) is an aluminum wire.

8. The heat dissipation assembly (50) according to claim 5, characterized in that, The support frame (54) includes a support leg (541) and a support beam (542). The two ends of the support leg (541) are connected to the bottom wall (512) of the immersion tank (51) and the support beam (542) respectively. A stepped groove (5421) is provided on the side of the support beam (542) away from the support leg (541), and part of the condenser (11) is inserted into the stepped groove (5421).

9. The heat dissipation assembly (50) according to claim 8, characterized in that, A heat-conducting plate (543) is provided on the inner surface of the stepped groove (5421), and the heat-conducting plate (543) is in contact with the condenser (11).

10. The heat dissipation assembly (50) according to claim 9, characterized in that, The heat-conducting sheet (543) is an aluminum sheet; And / or, a through groove (5431) is provided on the surface of the heat-conducting plate (543) facing the condenser (11), and the groove port of the through groove (5431) is connected to the immersion chamber (511).

11. The heat dissipation assembly (50) according to any one of claims 1-4, characterized in that, The heat dissipation assembly (50) further includes a housing (561), a bidirectional hydraulic pump (562), a first shut-off valve (563), and a water tank (564). The housing (561) covers the immersion tank (51), and a space (5611) is defined between the housing (561) and the immersion tank (51). The bidirectional hydraulic pump (562) is connected to the space (5611) and the water tank (564) through pipelines. The first shut-off valve (563) is disposed on the pipeline between the bidirectional hydraulic pump (562) and the space (5611).

12. The heat dissipation assembly (50) according to claim 11, characterized in that, The heat dissipation assembly (50) further includes a vent pipe (571) and a second shut-off valve (572). The vent pipe (571) is connected to the outer casing (561). The two ends of the vent pipe (571) are respectively connected to the external environment of the partition space (5611) and the outer casing (561). The second shut-off valve (572) is disposed on the vent pipe (571).

13. The heat dissipation assembly (50) according to claim 11, characterized in that, The heat dissipation assembly (50) also includes a vacuum pump (581) and a third shut-off valve (582). The vacuum pump (581) is connected to the partition space (5611) through a pipeline, and the third shut-off valve (582) is disposed on the pipeline between the vacuum pump (581) and the partition space (5611).

14. A thermal management system (1), characterized in that, include: Compressor (13); The heat dissipation assembly (50) as described in any one of claims 1-13, wherein one of the medium end pipes (111) of the condenser (11) is connected to one end of the compressor (13); and The heat exchanger (30) has a first heat exchange channel (31) and a second heat exchange channel (32), the first heat exchange channel (31) being connected to another medium end pipe (111) of the condenser (11) and the other end of the compressor (13), and the second heat exchange channel (32) being configured to communicate with a heat transfer device (301).

15. An energy storage system (2), characterized in that, include: The battery pack (3) has a heat transfer device (301); as well as In the thermal management system (1) as described in claim 14, the second heat exchange channel (32) is connected to the heat transfer device (301).

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