Thermal management system and thermal management method of energy storage equipment and energy storage equipment

Abstract

The invention belongs to the technical field of battery thermal management, and discloses an energy storage equipment thermal management system, a thermal management method and energy storage equipment. The thermal management system of the energy storage equipment comprises a water cooling system, a battery thermal management system and a PCS thermal management system, the water cooling system is used for generating a continuous cold source in refrigeration circulation so as to transmit the cold source into a first heat exchanger, and the battery thermal management system is used for outputting the cold source to a battery pack so as to refrigerate the battery pack. The PCS heat management system is used for outputting a cold source to the PCS system, so that the PCS system is refrigerated, and normal operation of the battery pack and the PCS system is guaranteed. According to the heat management system of the energy storage equipment, by controlling the first three-way valve and the second three-way valve, different types of cooling of the battery pack and the PCS system are achieved, so that different cooling requirements of the battery pack and the PCS system are met, energy conservation and emission reduction are achieved, the battery pack and the PCS system can be reliably cooled, and normal operation of the battery pack and the PCS system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and in particular to a thermal management system, a thermal management method and an energy storage device. Background Art

[0002] PCS (Power Conversion System) and battery pack are the core parts of energy storage equipment, which can realize the two-way flow, storage and release of electric energy between energy storage system and power grid. As the core equipment in energy storage system, PCS not only bears the heavy task of energy conversion and regulation, but also is the key to realize efficient, safe and flexible energy storage application. However, PCS and battery pack will generate heat during charging and discharging. The accumulation of heat will cause overheating of PCS and battery pack, thus affecting the charge and discharge conversion efficiency of PCS and the normal energy storage and release of battery pack. Therefore, cooling system is usually used in combination with energy storage equipment to cool down the energy storage equipment.

[0003] The cooling method of PCS in the prior art mostly adopts air cooling, in which circulating air blows over the surface of PCS to cool it down. However, as PCS continues to iterate towards high power, air cooling can no longer meet its heat dissipation needs, and the air cooling system has a loose structure and occupies a large space area. When liquid cooling is used to cool the PCS, due to the influence of ambient temperature and PCS overcurrent load, the compressor frequency of the liquid cooling system needs to be adjusted frequently, and even frequent shutdowns are required when the ambient temperature is too low to prevent the internal temperature of the liquid cooling system from being too low, which can easily cause damage to the compressor and waste energy.

[0004] Therefore, there is an urgent need to provide a new type of energy storage device thermal management system, thermal management method and energy storage device, so as to solve the above-mentioned technical problems in the prior art. Summary of the invention

[0005] One object of the present invention is to provide a thermal management system for energy storage equipment, which can cool the battery pack and PCS system to different degrees according to demand, thereby protecting the compressor and saving energy.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The energy storage equipment thermal management system includes a water cooling system, a battery thermal management system and a PCS thermal management system. The water cooling system includes a first heat exchanger, a compressor and a condenser which are connected in sequence to form a loop; the battery thermal management system includes a first water pump, a second heat exchanger, a first three-way valve and a first heat exchange pipeline. One end of the first water pump is connected to the water outlet pipeline of the battery pack, and the other end is connected to the first inlet a of the first three-way valve. The first outlet b of the first three-way valve is connected to one end of the first heat exchange pipeline. The first heat exchange pipeline is connected to the condenser for heat exchange. The other end of the first heat exchange pipeline and the second outlet c of the first three-way valve are both connected to the first heat exchanger. The first heat exchanger is also connected to the water inlet pipeline of the battery pack. The PCS thermal management system includes a second water pump, a second heat exchange pipeline and a second three-way valve. One end of the second water pump is connected to the water outlet pipeline of the PCS system, and the other end is respectively connected to one end of the second heat exchange pipeline and the second heat exchanger. The other end of the second heat exchange pipeline is connected to the second inlet d of the second three-way valve. The second heat exchange pipeline is connected to the condenser for heat exchange. The second heat exchanger is connected to the third inlet e arranged on the second three-way valve. The third outlet f of the second three-way valve is connected to the water inlet pipeline of the PCS system. The first inlet a is selectively connected to the first outlet b and the second outlet c, and the third outlet f is selectively connected to the second inlet d and the third inlet e.

[0008] Optionally, the energy storage device thermal management system further includes a controller, and the controller is signal-connected to the compressor, the first water pump, the first three-way valve, the second water pump and the second three-way valve respectively.

[0009] Optionally, the water cooling system, the battery thermal management system and the PCS thermal management system are all provided with temperature sensors and pressure sensors, and the temperature sensor and pressure sensor signals are connected to the controller.

[0010] Optionally, an expansion tank is provided between the first water pump and the water outlet pipeline of the battery pack, and between the second water pump and the water outlet pipeline of the PCS system.

[0011] Optionally, a heater is further provided between the first heat exchanger and the water inlet pipeline of the battery pack, and the heater is used to heat the cooling medium of the battery thermal management system.

[0012] Optionally, the condenser includes a first heat dissipation structure and a cooling fan arranged on the first heat dissipation structure.

[0013] Optionally, the first heat exchange pipeline is provided with a second heat dissipation structure, the second heat exchange pipeline is provided with a third heat dissipation structure, and both the second heat dissipation structure and the third heat dissipation structure are connected to the cooling fan for heat exchange.

[0014] Optionally, the first heat exchanger and the second heat exchanger are respectively any one of a tubular heat exchanger, a plate heat exchanger and a heat pipe heat exchanger.

[0015] Another object of the present invention is to provide a thermal management method for energy storage equipment, which is used to control the thermal management system of the energy storage equipment as described in any of the above-mentioned schemes, including the following steps: S1, temperature detection: detecting the temperature T1 of the above-mentioned battery pack and the ambient temperature T2 of the above-mentioned battery pack; detecting the temperature T3 of the above-mentioned PCS system and the ambient temperature T4 of the above-mentioned PCS system; S2, battery thermal management system mode selection: if T1 is not greater than the first preset temperature and T2 is not greater than the second preset temperature, turn off the above-mentioned water cooling system, and at this time connect the above-mentioned first inlet a of the above-mentioned first three-way valve to the above-mentioned first outlet b; otherwise, turn on the above-mentioned water cooling system, and connect the above-mentioned first inlet a of the above-mentioned first three-way valve to the above-mentioned second outlet c; S3, PCS thermal management system mode selection: if T2 is not greater than the third preset temperature and T4 is not greater than the fourth preset temperature, at this time connect the above-mentioned third outlet f of the above-mentioned second three-way valve to the above-mentioned second inlet d; otherwise, turn on the above-mentioned water cooling system, and connect the above-mentioned third outlet f of the above-mentioned second three-way valve to the above-mentioned third inlet e.

[0016] Another object of the present invention is to provide an energy storage device, which includes a battery pack, a PCS system and an energy storage device thermal management system as described in any of the above schemes, wherein the battery pack is connected to the battery thermal management system, and the PCS system is connected to the PCS thermal management system.

[0017] Beneficial effects:

[0018] The energy storage device thermal management system in the present invention includes three parts: a water cooling system, a battery thermal management system and a PCS thermal management system. The water cooling system is used to generate a continuous cold source in the refrigeration cycle, which is then transmitted to the first heat exchanger. The battery thermal management system is used to output the cold source to the battery pack, thereby cooling the battery pack. The PCS thermal management system is used to output the cold source to the PCS system, thereby cooling the PCS system, and ensuring the normal operation of the battery pack and the PCS system. At the same time, the battery thermal management system includes two refrigeration cycles, one of which is that the first heat exchange pipeline is directly connected to the condenser for heat exchange, and the cold source is transmitted to the battery pack. This cycle does not require the work of the water cooling system, and uses the heat dissipation structure on the condenser to cool the cooling medium in the cycle, which is suitable for cooling the battery pack at a low temperature; the second is that the first heat exchange pipeline exchanges heat through the condenser, and then exchanges heat with the first heat exchanger of the water cooling system, and finally cools the battery pack. This cycle uses the cold source generated by the water cooling system to cool the battery pack, which is suitable for cooling the battery pack at a high temperature. The above two cycles are carried out by switching the connection between the first inlet a of the first three-way valve and the first outlet b and the second outlet c. Similarly, the PCS thermal management system also includes two refrigeration cycles. One is that the second heat exchange pipeline is directly connected to the condenser for heat exchange, and the cold source is transmitted to the PCS system. This cycle does not require the help of the water cooling system and the battery thermal management system. It uses the heat dissipation structure on the condenser to cool the cooling medium in the cycle. It is suitable for cooling the PCS system at low temperatures to ensure the normal operation of the PCS system and will not increase the load of the water cooling system; the second is that the second heat exchange pipeline exchanges heat through the condenser, and then exchanges heat with the second heat exchanger of the battery thermal management system, and finally cools the PCS system. At this time, the battery thermal management system exchanges heat with the water cooling system through the first heat exchanger. This cycle uses the cold source generated by the water cooling system to be transmitted to the battery thermal management system, and then cools the PCS system. It is suitable for cooling the PCS system at high temperatures. The above two cycles are carried out by switching the connection between the second inlet d, the third inlet e and the third outlet f of the second three-way valve. The thermal management system of the energy storage device realizes different types of cooling of the battery pack and the PCS system by controlling the first three-way valve and the second three-way valve, so as to adapt to the different cooling requirements of the battery pack and the PCS system, thereby achieving energy conservation and emission reduction, and reliably cooling the battery pack and the PCS system to ensure the normal operation of the battery pack and the PCS system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a thermal management system for an energy storage device provided in a specific embodiment of the present invention.

[0020] In the figure:

[0021] 101, pressure sensor; 102, temperature sensor; 110, first heat exchanger; 120, compressor; 130, condenser; 131, first heat dissipation structure; 132, cooling fan;

[0022] 200, battery pack; 210, first water pump; 220, second heat exchanger; 230, first three-way valve; 240, first heat exchange pipeline; 241, second heat dissipation structure; 250, heater; 260, expansion tank;

[0023] 300, PCS system; 310, second water pump; 320, second heat exchange pipeline; 321, third heat dissipation structure; 330, second three-way valve. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0028] Please refer to Figure 1 In this embodiment, the energy storage device thermal management system includes a water cooling system, a battery thermal management system and a PCS thermal management system. The water cooling system includes a first heat exchanger 110, a compressor 120 and a condenser 130 which are connected in sequence to form a loop; the battery thermal management system includes a first water pump 210, a second heat exchanger 220, a first three-way valve 230 and a first heat exchange pipeline 240. One end of the first water pump 210 is connected to the water outlet pipeline of the battery pack 200, and the other end is connected to the first inlet a of the first three-way valve 230. The first outlet b of the first three-way valve 230 is connected to one end of the first heat exchange pipeline 240. The first heat exchange pipeline 240 is connected to the condenser 130 for heat exchange. The other end of the first heat exchange pipeline 240 and the second outlet c of the first three-way valve 230 are both connected to the first heat exchanger 110. The first heat exchanger 110 is also connected to the battery The PCS thermal management system includes a second water pump 310, a second heat exchange pipeline 320 and a second three-way valve 330, one end of the second water pump 310 is connected to the water outlet pipeline of the PCS system 300, and the other end is respectively connected to one end of the second heat exchange pipeline 320 and the second heat exchanger 220, the other end of the second heat exchange pipeline 320 is connected to the second inlet d of the second three-way valve 330, the second heat exchange pipeline 320 is connected to the condenser 130 for heat exchange, the second heat exchanger 220 is connected to the third inlet e arranged at the second three-way valve 330, and the third outlet f of the second three-way valve 330 is connected to the water inlet pipeline of the PCS system 300; wherein the first inlet a is selectively connected to the first outlet b and the second outlet c, and the third outlet f is selectively connected to the second inlet d and the third inlet e.

[0029] The energy storage device thermal management system in this embodiment includes three parts: a water cooling system, a battery thermal management system and a PCS thermal management system. The water cooling system is used to generate a continuous cold source in the refrigeration cycle, which is then transmitted to the first heat exchanger 110. The battery thermal management system is used to output the cold source to the battery pack 200, thereby cooling the battery pack 200. The PCS thermal management system is used to output the cold source to the PCS system 300, thereby cooling the PCS system 300, thereby ensuring the normal operation of the battery pack 200 and the PCS system 300. At the same time, the battery thermal management system includes two refrigeration cycles, one of which is that the first heat exchange pipeline 240 is directly connected to the condenser 130 for heat exchange, and the cold source is transmitted to the battery pack 200. This cycle does not require the operation of the water cooling system, and uses the heat dissipation structure on the condenser 130 to cool the cooling medium in the cycle, which is suitable for cooling the battery pack 200 at a relatively low temperature; the second is that the first heat exchange pipeline 240 exchanges heat through the condenser 130, and then exchanges heat with the first heat exchanger 110 of the water cooling system, and finally cools the battery pack 200. This cycle uses the cold source generated by the water cooling system to cool the battery pack 200, and is suitable for cooling the battery pack 200 at a relatively high temperature. The above two cycles are performed by switching the connection between the first inlet a of the first three-way valve 230 and the first outlet b and the second outlet c. Similarly, the PCS thermal management system also includes two refrigeration cycles, one of which is that the second heat exchange pipeline 320 is directly connected to the heat dissipation structure on the condenser 130 for heat exchange, and the cold source is transmitted to the PCS system 300. This cycle does not require the help of the water cooling system and the battery thermal management system. The condenser 130 is used to cool the cooling medium in the cycle. It is suitable for cooling the PCS system 300 at a low temperature to ensure the normal operation of the PCS system 300 and will not increase the load of the water cooling system; the second is that the second heat exchange pipeline 320 exchanges heat through the condenser 130, and then exchanges heat with the second heat exchanger 220 of the battery thermal management system, and finally cools the PCS system 300. At this time, the battery thermal management system exchanges heat with the water cooling system through the first heat exchanger 110. This cycle uses the cold source generated by the water cooling system to be transmitted to the battery thermal management system, and then cools the PCS system 300. It is suitable for cooling the PCS system 300 at a high temperature. The above two cycles are carried out by switching the connection between the second inlet d, the third inlet e and the third outlet f of the second three-way valve 330. The thermal management system of the energy storage device realizes different types of cooling of the battery pack 200 and the PCS system 300 by controlling the first three-way valve 230 and the second three-way valve 330, so as to adapt to the different cooling requirements of the battery pack 200 and the PCS system 300, thereby realizing energy conservation and emission reduction, and reliably cooling the battery pack 200 and the PCS system 300, thereby ensuring the normal operation of the battery pack 200 and the PCS system 300.

[0030] In this embodiment, the energy storage device thermal management system further includes a controller (not shown in the figure), which is respectively connected to the compressor 120, the first water pump 210, the first three-way valve 230, the second water pump 310 and the second three-way valve 330 by signal. The controller described herein can be a programmable logic controller (PLC) and a computer, etc., to control the flow, opening and opening and closing of the compressor 120, the first water pump 210 and the second water pump 310, as well as the opening and flow direction of the first three-way valve 230 and the second three-way valve 330, so as to be suitable for different cooling requirements of the battery pack 200 and the PCS system 300.

[0031] Furthermore, the water cooling system, the battery thermal management system and the PCS thermal management system are all provided with a temperature sensor 102 and a pressure sensor 101, and the signals of the temperature sensor 102 and the pressure sensor 101 are connected to the controller. Specifically, the water inlet and outlet pipes of the battery pack 200, the water inlet and outlet pipes of the PCS system 300, and the upstream and downstream of the compressor 120 of the cold water system are all provided with a temperature sensor 102 and a pressure sensor 101, and the air inlet of the condenser 130, the battery pack 200, and the PCS system 300 are all provided with a temperature sensor 102, so as to monitor the thermal management system of the energy storage device, and adjust the cooling method of the thermal management system of the energy storage device according to the demand to ensure that the temperature of each part meets the requirements.

[0032] The pressure sensor 101 can monitor the water pressure of the system in real time and upload it to the controller. The controller reads and compares it with the water pressure setting threshold, and then performs advance protection for the compressor 120, the first water pump 210, the second water pump 310 and the system pipeline, ensuring the operational reliability of the water system.

[0033] In this embodiment, an expansion tank 260 is provided between the first water pump 210 and the water outlet pipeline of the battery pack 200, and between the second water pump 310 and the water outlet pipeline of the PCS system 300. The expansion tank 260 is composed of four parts: a tank body, an air bag, a water inlet / outlet, and a gas replenishment port. When the external pressurized fluid enters the air bag of the expansion tank 260, the nitrogen sealed in the tank is compressed. After the gas is compressed, the volume decreases and the pressure increases until the gas pressure in the expansion tank 260 reaches the same as the pressure of the fluid and the water intake stops; when the fluid loss pressure decreases, the gas pressure in the expansion tank 260 is greater than the pressure of the fluid. At this time, the gas expands to squeeze the fluid in the air bag to replenish the battery thermal management system and the PCS thermal management system, ensuring the normal operation of the battery thermal management system and the PCS thermal management system.

[0034] Furthermore, a heater 250 is provided between the first heat exchanger 110 and the water inlet pipe of the battery pack 200. The heater 250 is used to heat the cooling medium of the battery thermal management system. When the ambient temperature is too low, such as in winter, the water cooling system is turned off and the heater 250 is used to heat the cooling medium in the battery thermal management system, thereby heating the battery pack 200 to ensure that the battery pack 200 works normally in a low temperature environment.

[0035] The cooling medium described here is one of water, silicone oil, air, carbon dioxide, nitrogen, dry air, propylene glycol, diethylene glycol, glycerol, ethylene glycol aqueous solution, inorganic salt aqueous solution, alkane and halogenated alkane; and the material form of the cooling medium is one of gas, liquid, gas-solid two-phase, gas-liquid two-phase and solid-liquid two-phase. In order to better meet the thermal management requirements of different needs, the cooling media in the water cooling system, battery thermal management system, and PCS thermal management system can be different or the same, and can be selected according to the cooling requirements, which will not be repeated here.

[0036] In this embodiment, the condenser 130 includes a first heat dissipation structure 131 and a cooling fan 132 disposed on the first heat dissipation structure 131. The cooling fan 132 cools the first heat dissipation structure 131 on the condenser 130 by blowing air, thereby improving the heat dissipation effect and ensuring that the water cooling system can provide sufficient cooling capacity to the first heat exchanger 110.

[0037] Please continue to refer to Figure 1 Optionally, the first heat exchange pipeline 240 is provided with a second heat dissipation structure 241, and the second heat exchange pipeline 320 is provided with a third heat dissipation structure 321, and the second heat dissipation structure 241 and the third heat dissipation structure 321 are both connected to the cooling fan 132 for heat exchange. By providing the second heat dissipation structure 241 and the third heat dissipation structure 321, the cooling fan 132 can be used to blow air to cool the second heat dissipation structure 241 and the third heat dissipation structure 321, thereby improving the cooling effect of the first heat exchange pipeline 240 and the second heat exchange pipeline 320.

[0038] Specifically, the first heat dissipation structure 131, the second heat dissipation structure 241 and the third heat dissipation structure 321 include a fin structure, a fin structure or a heat pipe structure. In this embodiment, the first heat dissipation structure 131, the second heat dissipation structure 241 and the third heat dissipation structure 321 are all fin structures, which can increase the heat dissipation area, and when the cooling fan 132 is started, the temperature can be quickly reduced to improve the cooling effect.

[0039] It should be noted that the first heat exchanger 110 and the second heat exchanger 220 are any one of a tubular heat exchanger, a plate heat exchanger and a heat pipe heat exchanger. A tubular heat exchanger conducts heat transfer through the pipe wall of a heat transfer tube. According to the structure of the heat transfer tube, it can be divided into several types such as shell-and-tube heat exchange tubes, shell-and-tube heat exchangers, serpentine heat exchangers and fin-and-tube heat exchangers. Tubular heat exchangers are the most widely used. A plate heat exchanger conducts heat transfer through the plate surface of a heat transfer plate. According to the structure of the heat transfer plate, it can be divided into a flat plate heat exchanger, a spiral plate heat exchanger, a plate-fin heat exchanger and a hot plate heat exchanger. A heat pipe heat exchanger is a heat exchanger with a special structure designed according to special process requirements. It is a new type of high-efficiency heat exchanger with a heat pipe as a heat transfer unit. It is composed of a shell, a heat pipe and a partition. The heat pipe is the main heat transfer element and is a heat transfer device with high thermal conductivity. In this embodiment, a plate heat exchanger is specifically selected, which has a compact structure and provides a large heat exchange area per unit volume. It is flexible to assemble and the number of plates can be increased or decreased as needed to adjust the heat transfer area. The corrugation of the plate surface makes the cross-section change complex, the disturbance effect of the fluid is enhanced, and it has a higher heat transfer efficiency. It is easy to disassemble and assemble, which is conducive to maintenance and cleaning.

[0040] The present embodiment also provides a method for thermal management of an energy storage device, which is used to control the thermal management system of the energy storage device as described in any of the above schemes, including the following steps: S1, temperature detection: detecting the temperature T1 of the battery pack 200 and the ambient temperature T2 of the battery pack 200; detecting the temperature T3 of the PCS system 300 and the ambient temperature T4 of the PCS system 300; S2, battery thermal management system mode selection: if T1 is not greater than the first preset temperature and T2 is not greater than the second preset temperature, shut down the water cooling system, at this time The above-mentioned first inlet a of the above-mentioned first three-way valve 230 is connected to the above-mentioned first outlet b; otherwise, the above-mentioned water cooling system is turned on, and the above-mentioned first inlet a of the above-mentioned first three-way valve 230 is connected to the above-mentioned second outlet c; S3, PCS thermal management system mode selection: if T2 is not greater than the third preset temperature and T4 is not greater than the fourth preset temperature, at this time, the above-mentioned third outlet f of the above-mentioned second three-way valve 330 is connected to the above-mentioned second inlet d; otherwise, the above-mentioned water cooling system is turned on, and the above-mentioned third outlet f of the above-mentioned second three-way valve 330 is connected to the above-mentioned third inlet e.

[0041] The thermal management method of the energy storage device can determine which cooling mode to use according to the temperature T1, T3 of the battery pack 200 and the PCS system 300 and the environment T2, T4. For example, if T1 is not greater than the first preset temperature and T2 is not greater than the second preset temperature, the cooling demand of the battery pack is relatively small, and only the first heat exchange pipeline 240 needs to be directly connected to the condenser 130 for heat exchange to transmit the cold source to the battery pack 200. This cycle does not require the operation of the water cooling system, and the heat dissipation structure on the condenser 130 is used to cool the cooling medium in the cycle; if T1 exceeds the first preset temperature or T2 exceeds the second preset temperature, the battery pack 200 or the environment temperature is relatively high at this time, and the first heat exchange pipeline 240 exchanges heat through the condenser 130, and then exchanges heat with the first heat exchanger 110 of the water cooling system, and finally cools the battery pack 200. This cycle uses the cold source generated by the water cooling system to cool the battery pack 200; Similarly, if T2 is not greater than the third preset temperature and T4 is not greater than the fourth preset temperature, the cooling capacity required by the PCS system 300 is relatively small. The second heat exchange pipeline 320 is directly connected to the heat dissipation structure on the condenser 130 for heat exchange, and the cold source is transmitted to the PCS system 300. This cycle does not require the help of the water cooling system and the battery thermal management system. The condenser 130 is used to cool the cooling medium in the cycle; if T3 exceeds the third preset temperature or T4 exceeds the fourth preset temperature, a higher cooling capacity is required. The second heat exchange pipeline 320 exchanges heat through the condenser 130, and then exchanges heat with the second heat exchanger 220 of the battery thermal management system, and finally cools the PCS system 300. The battery thermal management system exchanges heat with the water cooling system through the first heat exchanger 110. This cycle uses the cold source generated by the water cooling system to be transmitted to the battery thermal management system, and then cools the PCS system 300. The thermal management method of the energy storage device realizes different types of cooling of the battery pack 200 and the PCS system 300 so as to adapt to the different cooling requirements of the battery pack 200 and the PCS system 300, which not only realizes energy conservation and emission reduction, but also can reliably cool the battery pack 200 and the PCS system 300 to ensure the normal operation of the battery pack 200 and the PCS system 300.

[0042] Specifically, the measurement of T1, T2, T3 and T4 is achieved through the temperature sensor 102, which will not be repeated here. The energy storage device thermal management method is stored in the controller, which controls the flow, opening and opening and closing of the compressor 120, the first water pump 210 and the second water pump 310, as well as the opening and flow direction of the first three-way valve 230 and the second three-way valve 330, so as to be suitable for the different cooling requirements of the battery pack 200 and the PCS system 300.

[0043] This embodiment also provides an energy storage device, which includes a battery pack 200, a PCS system 300 and an energy storage device thermal management system as described in any of the above schemes, wherein the battery pack 200 is connected to the battery thermal management system, and the PCS system 300 is connected to the PCS thermal management system. Specifically, the energy storage device can be used for electric vehicles, hybrid electric vehicles, energy storage containers, electric ships, etc. By using the above energy storage device thermal management system, the battery pack 200 and the PCS system 300 can be cooled according to different requirements, ensuring the stable operation of the battery pack 200 and the PCS system 300 and improving the system reliability.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A thermal management system for energy storage equipment, characterized in that: include: A water cooling system, the water cooling system comprising a first heat exchanger (110), a compressor (120) and a condenser (130) which are sequentially connected to form a loop; A battery thermal management system, the battery thermal management system comprising a first water pump (210), a second heat exchanger (220), a first three-way valve (230) and a first heat exchange pipeline (240), one end of the first water pump (210) being connected to a water outlet pipeline of a battery pack (200), and the other end being connected to a first inlet a of the first three-way valve (230), a first outlet b of the first three-way valve (230) being connected to one end of the first heat exchange pipeline (240), the first heat exchange pipeline (240) being connected to the condenser (130) for heat exchange, the other end of the first heat exchange pipeline (240) and the second outlet c of the first three-way valve (230) being both connected to the first heat exchanger (110), and the first heat exchanger (110) being further connected to a water inlet pipeline of the battery pack (200); A PCS thermal management system, the PCS thermal management system comprising a second water pump (310), a second heat exchange pipeline (320) and a second three-way valve (330); one end of the second water pump (310) is connected to the water outlet pipeline of the PCS system (300), and the other end is respectively connected to one end of the second heat exchange pipeline (320) and the second heat exchanger (220); the other end of the second heat exchange pipeline (320) is connected to the second inlet d of the second three-way valve (330); the second heat exchange pipeline (320) is connected to the condenser (130) for heat exchange; the second heat exchanger (220) is connected to the third inlet e arranged on the second three-way valve (330); the third outlet f of the second three-way valve (330) is connected to the water inlet pipeline of the PCS system (300); wherein the first inlet a is selectively connected to the first outlet b and the second outlet c, and the third outlet f is selectively connected to the second inlet d and the third inlet e.

2. The energy storage device thermal management system according to claim 1, characterized in that: The energy storage device thermal management system further comprises a controller, which is respectively connected to the compressor (120), the first water pump (210), the first three-way valve (230), the second water pump (310) and the second three-way valve (330) via signals.

3. The energy storage device thermal management system according to claim 2, characterized in that: The water cooling system, the battery thermal management system and the PCS thermal management system are all provided with a temperature sensor (102) and a pressure sensor (101), and the signals of the temperature sensor (102) and the pressure sensor (101) are connected to the controller.

4. The energy storage device thermal management system according to claim 1, characterized in that: An expansion tank (260) is provided between the first water pump (210) and the water outlet pipeline of the battery pack (200), and between the second water pump (310) and the water outlet pipeline of the PCS system (300).

5. The energy storage device thermal management system according to claim 1, characterized in that: A heater (250) is also provided between the first heat exchanger (110) and the water inlet pipeline of the battery pack (200), and the heater (250) is used to heat the cooling medium of the battery thermal management system.

6. The energy storage device thermal management system according to claim 1, characterized in that: The condenser (130) comprises a first heat dissipation structure (131) and a cooling fan (132) arranged on the first heat dissipation structure (131).

7. The energy storage device thermal management system according to claim 6, characterized in that: The first heat exchange pipeline (240) is provided with a second heat dissipation structure (241), the second heat exchange pipeline (320) is provided with a third heat dissipation structure (321), and the second heat dissipation structure (241) and the third heat dissipation structure (321) are both connected to the cooling fan (132) for heat exchange.

8. The thermal management system for energy storage equipment according to any one of claims 1 to 7, characterized in that: The first heat exchanger (110) and the second heat exchanger (220) are respectively any one of a tubular heat exchanger, a plate heat exchanger and a heat pipe heat exchanger.

9. A thermal management method for energy storage equipment, characterized in that: A method for controlling a thermal management system for an energy storage device according to any one of claims 1 to 8, comprising the steps of: S1, temperature detection: detecting the temperature T1 of the battery pack (200) and the ambient temperature T2 of the battery pack (200); detecting the temperature T3 of the PCS system (300) and the ambient temperature T4 of the PCS system (300); S2, battery thermal management system mode selection: if T1 is not greater than a first preset temperature and T2 is not greater than a second preset temperature, the water cooling system is turned off, and the first inlet a of the first three-way valve (230) is connected to the first outlet b; otherwise, the water cooling system is turned on, and the first inlet a of the first three-way valve (230) is connected to the second outlet c; S3, PCS thermal management system mode selection: if T2 is not greater than the third preset temperature and T4 is not greater than the fourth preset temperature, the third outlet f of the second three-way valve (330) is connected to the second inlet d; otherwise, the water cooling system is turned on, and the first inlet a of the first three-way valve (230) is connected to the second outlet c, and the third outlet f of the second three-way valve (330) is connected to the third inlet e.

10. Energy storage device, characterized in that It comprises a battery pack (200), a PCS system (300) and an energy storage device thermal management system as described in any one of claims 1 to 8, wherein the battery pack (200) is connected to the battery thermal management system, and the PCS system (300) is connected to the PCS thermal management system.

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