Thermal management system for energy storage battery

Abstract

The utility model belongs to the technical field of energy storage batteries, and particularly relates to a heat management system for an energy storage battery, which comprises an energy storage battery, a water cooling system and an air-conditioning system, and the water cooling system comprises a low-temperature radiator, an expansion kettle, an electronic water pump, a three-way proportional valve, a WPTC, a plate heat exchanger and a water cooling pipeline. The air conditioning pipeline comprises a condenser, a refrigerant four-way reversing valve, a compressor, a plate heat exchanger, a gas-liquid separator, a liquid storage tank and an expansion valve, and the water cooling system and the air conditioning system are mutually matched to work. And when the battery needs to be cooled during charging and discharging, only a compressor works for heat exchange under the working condition of lower environment temperature, so that the energy consumption saving management is not facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage batteries, and particularly relates to a thermal management system for energy storage batteries. Background Art

[0002] At present, there are some problems with the battery thermal management system of energy storage batteries. PTC direct heating is used in the low-temperature preheating system, and there are problems with low PTC heating conversion efficiency and high energy consumption (COP < 1) in the low-temperature battery preheating stage. When the battery is charging and discharging, cooling is required. During cooling, the air conditioning refrigerant system and the battery cooling water system are mainly used for heat exchange. Even under conditions with low ambient temperatures, heat exchange can only be achieved by relying solely on the compressor, which is not conducive to energy saving management.

[0003] Chinese patent application number CN202320138705.4 discloses a battery thermal management system, a thermal management system, an energy storage system, and an electrical device, comprising: a battery rack, wherein the battery rack is provided with a plurality of accommodation spaces spaced apart in the height direction; a plurality of battery modules, wherein the plurality of battery modules are respectively arranged in the plurality of accommodation spaces; a plurality of heat dissipation modules, wherein the plurality of heat dissipation modules are respectively arranged between two adjacent battery modules, and the heat dissipation modules include: a heat dissipation channel, a first flow valve, and a temperature sensor. The heat dissipation channel is arranged below the battery module and is reciprocated, and the first flow valve and the temperature sensor are arranged at one end of the heat dissipation channel. The heat dissipation channel is arranged in a reciprocating cycle to ensure that the heat dissipation channel can remove all heat released by the battery module. The temperature sensor feedback and control system are used to regulate the opening of the first flow valve, which can control the refrigerant flow between each heat dissipation module in real time to ensure uniform heat dissipation for each battery module on the battery rack.

[0004] However, the thermal management system in the above-mentioned prior art cannot heat the battery when starting, and similar thermal management systems have low heating conversion efficiency and high energy consumption when heating the low-temperature battery when starting. When the battery needs to be cooled during charging and discharging, it can only rely solely on the compressor to exchange heat under low ambient temperature conditions, which is not conducive to energy saving management. Utility Model Content

[0005] In response to the above-mentioned shortcomings in the prior art, the present invention provides a thermal management system for energy storage batteries, which is used to solve the problems of low heating conversion efficiency and high energy consumption when the existing thermal management system is used to heat the low-temperature battery at startup. When the battery needs to be cooled during charging and discharging, it can only rely solely on the compressor to exchange heat under low ambient temperature conditions, which is not conducive to energy saving management.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A thermal management system for an energy storage battery includes an energy storage battery, a water cooling system, and an air conditioning system. The water cooling system includes a low-temperature radiator, an expansion kettle, an electronic water pump, a three-way proportional valve, a WPTC, a plate heat exchanger, and a water cooling pipeline. The air conditioning pipeline includes a condenser, a refrigerant four-way reversing valve, a compressor, a plate heat exchanger, a gas-liquid separator, a liquid storage tank, and an expansion valve. The water cooling system and the air conditioning system work in coordination with each other. The plate heat exchanger is provided with a plate heat exchanger port, a plate heat exchanger port, a plate heat exchanger port, a plate heat exchanger port, and a plate heat exchanger port. Heat is exchanged between the water cooling system and the air conditioning system via the plate heat exchanger.

[0008] By adopting the above technical solution, the water cooling system and the air-conditioning system work together to perform appropriate heat management on the energy storage batteries in different working states. The plate heat exchanger can connect the two systems of water cooling system and air-conditioning system to achieve collaborative work and switch modes in the face of different external ambient temperatures. It can solve the energy saving problem of the energy storage battery thermal management system during battery preheating and battery cooling when the ambient temperature is below ℃.

[0009] Furthermore, the three-way proportional valve is provided with a three-way valve port A, a three-way valve port B, and a three-way valve port C; one end of the low-temperature radiator is connected to the three-way valve port A of the three-way proportional valve; the end of the low-temperature radiator away from the three-way proportional valve is connected to the electronic water pump; the other end of the electronic water pump is connected to the energy storage battery; the end of the energy storage battery away from the electronic water pump is connected to the three-way valve port B of the three-way proportional valve; the three-way valve port C of the three-way proportional valve is connected to the WPTC; the other end of the WPTC is connected to the plate heat exchanger port 2 of the plate heat exchanger; the plate heat exchanger port 1 of the plate heat exchanger is connected to the end of the electronic water pump away from the energy storage battery; the plate heat exchanger port 1 is connected to the plate heat exchanger port 2 inside the plate heat exchanger.

[0010] By adopting the above technical solution, the three-way proportional valve can control the operation of the water cooling system. By internally switching the connection between the three-way valve A port and the three-way valve B port and the connection between the three-way valve B port and the three-way valve C port, different working modes are presented to meet different working requirements. The low-temperature radiator can dissipate heat for the cooling water in the water cooling pipeline, the electronic water pump can provide kinetic energy for the cooling water in the water cooling pipeline, and the WPTC can generate heat energy to heat the cooling water in the water cooling pipeline, thereby providing heat energy to the energy storage battery when it starts, allowing the energy storage battery to quickly enter the working state and achieve rapid preheating.

[0011] Furthermore, the expansion kettle is provided with one kettle opening, two kettle openings, and three kettle openings. The plate heat exchanger opening of the plate heat exchanger is connected to the second kettle opening of the expansion kettle. The end of the electronic water pump close to the energy storage battery is connected to the third kettle opening of the expansion kettle. The end of the low-temperature radiator away from the three-way proportional valve is connected to the one kettle opening of the expansion kettle.

[0012] By adopting the above technical solution, the expansion kettle is a container for filling and compensating liquid for the water cooling system. When the water temperature rises, part of the cooling water vaporizes and the expansion kettle compensates for it. When the water temperature drops, the gaseous cooling water liquefies and the expansion kettle provides storage space for it.

[0013] Furthermore, each component of the water cooling system is connected via a water cooling pipeline.

[0014] By adopting the above technical solution, the water cooling pipeline enables each component in the water cooling system to form a complete circuit without direct contact with the outside world.

[0015] Furthermore, the refrigerant four-way reversing valve is provided with one port of a four-way valve, two ports of a four-way valve, three ports of a four-way valve, and four ports of a four-way valve. One end of the condenser is connected to the one port of the four-way valve of the refrigerant four-way reversing valve, the end of the condenser away from the one port of the four-way valve is connected to the inlet end of the liquid storage tank, the two ports of the four-way valve are connected to the inlet end of the gas-liquid separator, the outlet end of the gas-liquid separator is connected to one end of the compressor, and the other end of the compressor is connected to the four ports of the four-way valve of the refrigerant four-way reversing valve, the three ports of the four-way valve of the refrigerant four-way reversing valve are connected to the three ports of the plate heat exchanger, the four ports of the plate heat exchanger are connected to the inlet end of the liquid storage tank, the outlet end of the liquid storage tank is respectively connected to the four ports of the plate heat exchanger and the end of the condenser away from the one port of the four-way valve, and the three ports of the plate heat exchanger are connected to the four ports of the plate heat exchanger inside the plate heat exchanger.

[0016] By adopting the above technical solution, the refrigerant four-way reversing valve can control the operation of the air-conditioning system. By internally switching the four-way valve port 1 to be connected with the four-way valve port 2, the four-way valve port 3 to be connected with the four-way valve port 4, and the four-way valve port 1 to be connected with the four-way valve port 4, and the four-way valve port 2 to be connected with the four-way valve port 3, different working modes are presented to meet different working needs. The condenser can dissipate heat, cool down, or heat and increase the temperature of the gaseous and liquid substances in the air-conditioning pipeline. Different working effects will be presented under different working modes. The compressor can compress the gas in the air-conditioning pipeline to provide it with kinetic energy. When the gas passes through the plate heat exchanger, it can provide a special structure inside the plate heat exchanger to realize the temperature exchange of substances in the water-cooling pipeline and the air-conditioning pipeline. The gas-liquid separator can separate and process the input gas-liquid mixture, store the liquid, and only output gas. The liquid storage tank can provide storage space for the liquid.

[0017] Furthermore, a second one-way valve is provided between the end of the condenser away from the one port of the four-way valve and the inlet end of the liquid storage tank, and the flow direction of the second one-way valve is from the condenser to the liquid storage tank. A first one-way valve is provided between the four ports of the plate heat exchanger and the inlet end of the liquid storage tank, and the flow direction of the first one-way valve is from the four ports of the plate heat exchanger to the liquid storage tank. A third one-way valve is provided between the outlet end of the liquid storage tank and the four ports of the plate heat exchanger, and the flow direction of the third one-way valve is from the liquid storage tank to the four ports of the plate heat exchanger. A fourth one-way valve is provided between the outlet end of the liquid storage tank and the end of the condenser away from the one port of the four-way valve, and the flow direction of the fourth one-way valve is from the liquid storage tank to the condenser.

[0018] By adopting the above technical solution, the first one-way valve, the second one-way valve, the third one-way valve, and the fourth one-way valve can control the one-way movement of gas and liquid substances in the air-conditioning pipeline in multiple air-conditioning pipelines between the condenser, the four ports of the plate heat exchanger, and the liquid storage tank, thereby ensuring the reasonable operation of the air-conditioning system in different modes.

[0019] Furthermore, an expansion valve is provided at the outlet end of the liquid storage tank.

[0020] By adopting the above technical solution, the expansion valve allows the medium-temperature and high-pressure liquid refrigerant to be throttled to become low-temperature and low-pressure wet steam, and then re-outputs the low-temperature and low-pressure wet steam.

[0021] Furthermore, each component of the air-conditioning system is connected via air-conditioning pipelines.

[0022] By adopting the above technical solution, the air-conditioning pipeline enables each component in the air-conditioning system to form a complete circuit without direct contact with the outside world.

[0023] Furthermore, the condenser and the low-temperature radiator are provided with heat exchange fans.

[0024] By adopting the above technical solution, the heat exchange fan can discharge the excess heat generated by the condenser and the low-temperature radiator during operation, ensuring that the condenser and the low-temperature radiator are in normal working condition and extending the service life of the condenser and the low-temperature radiator.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The thermal management system proposed in this utility model has three operating modes for different stages of the energy storage battery operation. The three operating modes work together to effectively solve the energy saving problem of the energy storage battery thermal management system during battery preheating and battery cooling when the ambient temperature is below 10°C. In particular, the energy saving is about 2 / 3 of the energy consumption compared with traditional air conditioning cooling mode when the ambient temperature is below 10°C. In China, the average duration of ambient temperature below 10°C is 4 months per year. If it is applied to large-scale energy storage devices, the economic benefits and value are particularly considerable.

[0027] 2. The thermal management system has a simple structure and all components used are conventional and mature products, so the system is easy to manufacture and control;

[0028] 3. The water cooling system and air conditioning system in this thermal management system work together to provide appropriate heat management for energy storage batteries in different working states. The plate heat exchanger can connect the water cooling system and the air conditioning system to enable them to work together and switch modes in response to different external ambient temperatures. This can solve the energy saving problem of the energy storage battery thermal management system during battery preheating and battery cooling when the ambient temperature is below 10°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a simplified structural diagram of an embodiment of a thermal management system for an energy storage battery mentioned in the present utility model;

[0030] Figure 2 A simplified diagram of the connection structure of an expansion kettle, a three-way proportional valve, a refrigerant four-way reversing valve, and a plate heat exchanger in an embodiment of a thermal management system for an energy storage battery mentioned in the present utility model;

[0031] Figure 3 This is a system operation block diagram of battery startup heating in an embodiment of a thermal management system for an energy storage battery mentioned in the present utility model;

[0032] Figure 4 This is a system operation block diagram of battery cooling when the ambient temperature is lower than 10 degrees in an embodiment of a thermal management system for an energy storage battery mentioned in the present utility model;

[0033] Figure 5 This is a system operation block diagram of battery cooling when the ambient temperature is higher than 10 degrees in an embodiment of a thermal management system for an energy storage battery mentioned in the present utility model;

[0034] The reference numerals in the drawings of the specification include:

[0035] Condenser 1, heat exchange fan 2, low-temperature radiator 3, expansion kettle 4, kettle one port 401, kettle two port 402, kettle three port 403, energy storage battery 5, electronic water pump 6, three-way proportional valve 7, three-way valve A port 701, three-way valve B port 702, three-way valve C port 703, refrigerant four-way reversing valve 8, four-way valve one port 801, four-way valve two port 802, four-way valve three port 803, four-way valve four port 804, compressor 9, WPT C10, plate heat exchanger 11, plate heat exchanger port 1101, plate heat exchanger port 2 1102, plate heat exchanger port 3 1103, plate heat exchanger port 4 1104, gas-liquid separator 12, liquid storage tank 13, expansion valve 14, first check valve 1501, second check valve 1502, third check valve 1503, fourth check valve 1504, water cooling system 16, air-conditioning system 17, water cooling pipeline 18, air-conditioning pipeline 19. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0037] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] In the description of this utility model, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term 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 internal communication between two components or an interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0040] Example:

[0041] like Figure 1-Figure 5 As shown, the utility model provides a thermal management system for an energy storage battery, including an energy storage battery 5, a water cooling system 16, and an air conditioning system 17. The water cooling system 16 includes: a low-temperature radiator 3, an expansion kettle 4, an electronic water pump 6, a three-way proportional valve 7, a WPTC 10, a plate heat exchanger 11, and a water cooling pipeline 18. The air conditioning pipeline 19 includes: a condenser 1, a refrigerant four-way reversing valve 8, a compressor 9, a plate heat exchanger 11, a gas-liquid separator 12, a liquid storage tank 13, and an expansion valve 14. The water cooling system 16 and the air conditioning system 17 work in coordination with each other. The plate heat exchanger 11 is provided with a plate heat exchanger port 1101, a plate heat exchanger port 2 1102, a plate heat exchanger port 3 1103, and a plate heat exchanger port 4 1104. Heat exchange is performed between the water cooling system 16 and the air conditioning system 17 through the plate heat exchanger 11. Specifically, the water cooling system 16 and the air conditioning system 17 work together to perform appropriate heat management on the energy storage battery 5 in different working states. The plate heat exchanger 11 can connect the water cooling system 16 and the air conditioning system 17 to enable them to work together and switch modes in response to different external ambient temperatures. This can solve the energy saving problem of the energy storage battery thermal management system during battery preheating and battery cooling when the ambient temperature is below 10°C.

[0042] The three-way proportional valve 7 is provided with a three-way valve A port 701, a three-way valve B port 702, and a three-way valve C port 703. One end of the low-temperature radiator 3 is connected to the three-way valve A port 701 of the three-way proportional valve 7, and the end of the low-temperature radiator 3 away from the three-way proportional valve 7 is connected to the electronic water pump 6. The other end of the electronic water pump 6 is connected to the energy storage battery 5. The end of the energy storage battery 5 away from the electronic water pump 6 is connected to the three-way valve B port 702 of the three-way proportional valve 7. The three-way valve C port 703 of the three-way proportional valve 7 is connected to the WPTC 10. The other end of the WPTC 10 is connected to the plate heat exchanger second port 1102 of the plate heat exchanger 11. The plate heat exchanger first port 1101 of the plate heat exchanger 11 is connected to the end of the electronic water pump 6 away from the energy storage battery 5. The plate heat exchanger first port 1101 and the plate heat exchanger second port 1102 are connected inside the plate heat exchanger 11. Specifically, the three-way proportional valve 7 can control the operation of the water cooling system 16, and present different working modes by internally switching the three-way valve A port 701 to be connected with the three-way valve B port 702 and the three-way valve B port 702 to be connected with the three-way valve C port 703, which is suitable for different working requirements. The low-temperature radiator 3 can dissipate heat for the cooling water in the water cooling pipe 18, the electronic water pump 6 can provide kinetic energy for the cooling water in the water cooling pipe 18, and the WPTC10 can generate heat energy to heat the cooling water in the water cooling pipe 18, thereby providing heat energy to the energy storage battery 5 when it starts, so that the energy storage battery 5 can quickly enter the working state and achieve rapid preheating.

[0043] The expansion kettle 4 is provided with a first opening 401, a second opening 402, and a third opening 403. The first opening 1101 of the plate heat exchanger 11 is connected to the second opening 402 of the expansion kettle 4. The end of the electronic water pump 6 closest to the energy storage battery 5 is connected to the third opening 403 of the expansion kettle 4. The end of the low-temperature radiator 3 remote from the three-way proportional valve 7 is connected to the first opening 401 of the expansion kettle 4. Specifically, the expansion kettle 4 is a container for adding and compensating liquid to the water cooling system 16. When the water temperature rises, some of the cooling water vaporizes, and the expansion kettle 4 becomes the compensating liquid. When the water temperature drops, the gaseous cooling water liquefies, and the expansion kettle 4 provides storage space for the liquefied liquid.

[0044] Each component of the water cooling system 16 is connected by a water cooling pipe 18. Specifically, the water cooling pipe 18 enables each component in the water cooling system 16 to form a complete circuit without direct contact with the outside world.

[0045] The refrigerant four-way reversing valve 8 is provided with a four-way valve port 801, a four-way valve port 2 802, a four-way valve port 3 803, and a four-way valve port 4 804. One end of the condenser 1 is connected to the four-way valve port 801 of the refrigerant four-way reversing valve 8, and the end of the condenser 1 away from the four-way valve port 801 is connected to the inlet end of the liquid storage tank 13, the four-way valve port 2 802 is connected to the inlet end of the gas-liquid separator 12, the outlet end of the gas-liquid separator 12 is connected to one end of the compressor 9, and the other end of the compressor 9 is connected to the refrigerant four-way reversing valve 8 is connected to the four-way valve four-way port 804, the four-way valve three-way port 803 of the refrigerant four-way reversing valve 8 is connected to the plate heat exchanger three-port 1103 of the plate heat exchanger 11, the plate heat exchanger four-port 1104 of the plate heat exchanger 11 is connected to the inlet end of the liquid storage tank 13, and the outlet end of the liquid storage tank 13 is respectively connected to the plate heat exchanger four-port 1104 and one end of the condenser 1 away from the four-way valve one-port 801, and the plate heat exchanger three-port 1103 and the plate heat exchanger four-port 1104 are connected inside the plate heat exchanger 11. Specifically, the refrigerant four-way reversing valve 8 can control the operation of the air-conditioning system 17. By internally switching the four-way valve port 801 to be connected with the four-way valve port 802, the four-way valve port 803 to be connected with the four-way valve port 804, and the four-way valve port 801 to be connected with the four-way valve port 804, and the four-way valve port 802 to be connected with the four-way valve port 803, different working modes are presented to meet different working requirements. The condenser 1 can dissipate heat, cool down, or heat and increase the temperature of the gaseous and liquid substances in the air-conditioning pipeline 19, and different working effects will be presented in different working modes. The compressor 9 can compress the gas in the air-conditioning pipeline 19 to provide it with kinetic energy. When the gas passes through the plate heat exchanger 11, it can provide a special structure inside the plate heat exchanger 11 to realize the temperature exchange of substances in the water-cooling pipeline 18 and the air-conditioning pipeline 19. The gas-liquid separator 12 can separate and process the input gas-liquid mixture, store the liquid, and only output gas. The liquid storage tank 13 can provide storage space for the liquid.

[0046] A second one-way valve 1502 is provided between the end of the condenser 1 away from the port 801 of the four-way valve and the inlet end of the liquid storage tank 13. The flow direction of the second one-way valve 1502 is from the condenser 1 to the liquid storage tank 13. A first one-way valve 1501 is provided between the four ports 1104 of the plate heat exchanger and the inlet end of the liquid storage tank 13. The flow direction of the first one-way valve 1501 is from the four ports 1104 of the plate heat exchanger to the liquid storage tank 13. A third one-way valve 1503 is provided between the outlet end of the liquid storage tank 13 and the four ports 1104 of the plate heat exchanger. The flow direction of the third one-way valve 1503 is from the liquid storage tank 13 to the four ports 1104 of the plate heat exchanger. A fourth one-way valve 1504 is provided between the outlet end of the liquid storage tank 13 and the end of the condenser 1 away from the port 801 of the four-way valve. The flow direction of the fourth one-way valve 1504 is from the liquid storage tank 13 to the condenser 1. Specifically, the first one-way valve 1501, the second one-way valve 1502, the third one-way valve 1503, and the fourth one-way valve 1504 can control the one-way movement of gas and liquid substances in the air-conditioning pipeline 19 in multiple air-conditioning pipelines 19 between the condenser 1, the four ports 1104 of the plate heat exchanger, and the liquid storage tank 13, thereby ensuring the reasonable operation of the air-conditioning system 17 in different modes.

[0047] An expansion valve 14 is provided at the outlet of the liquid storage tank 13. Specifically, the expansion valve 14 throttles the medium-temperature and high-pressure liquid refrigerant to become low-temperature and low-pressure wet steam, and then re-outputs the low-temperature and low-pressure wet steam.

[0048] The various components of the air conditioning system 17 are connected via air conditioning pipes 19. Specifically, the air conditioning pipes 19 enable the various components in the air conditioning system 17 to form a complete circuit without direct contact with the outside world.

[0049] A heat exchange fan 2 is provided on the condenser 1 and the low-temperature radiator 3. Specifically, the heat exchange fan 2 can discharge excess heat generated by the condenser 1 and the low-temperature radiator 3 during operation, ensuring that the condenser 1 and the low-temperature radiator 3 are in normal working condition and extending the service life of the condenser 1 and the low-temperature radiator 3.

[0050] In the specific use process, there are the following modes:

[0051] like Figure 3As shown, the battery starts heating. When the ambient temperature is lower than 0°C, the three-way valve B port 702 and the three-way valve C port 703 are connected, the four-way valve port 1 801 is connected to the inside of the four-way valve port 2 802, and the four-way valve port 3 803 is connected to the inside of the four-way valve port 4 804. The condenser 1 starts the heating mode, the WPTC 10 starts heating, and the condenser 1 and WPTC 10 work in a mixed heating mode. The COP is ≥1, and the energy storage battery 5 is quickly heated and started, so that the energy storage battery 5 can reach the operating temperature in a short time. When the ambient temperature is higher than 0°C, the three-way valve B port 702 and the three-way valve C port 703 are connected, the four-way valve port 1 801 is connected to the inside of the four-way valve port 2 802, and the four-way valve port 3 803 is connected to the inside of the four-way valve port 4 804. The condenser 1 starts the heating mode, and the condenser 1 works independently. The COP is ≥1.5, and the energy storage battery 5 is quickly heated and started, so that the energy storage battery 5 can reach the operating temperature in a short time.

[0052] like Figure 4 As shown, when the battery is cooled and the ambient temperature is below 10°C, the three-way valve A port 701 and the three-way valve B port 702 are connected, the compressor 9 stops working, the air conditioning system 17 stops running, and the low-temperature radiator 3 starts to operate independently and starts to dissipate heat, ensuring a COP>8. At this time, if the compressor is used alone for cooling and heat dissipation, the COP can only be achieved. Compared with the cooling by the compressor 9, the energy consumption of the low-temperature radiator 3 operating independently is only about 1 / 3.

[0053] like Figure 5 As shown, when the battery is cooled and the ambient temperature is greater than 10°C, the three-way valve B port 702 and the three-way valve C port 703 are connected, the four-way valve port 1 801 is internally connected to the four-way valve port 4 804, the four-way valve port 2 802 is internally connected to the four-way valve port 3 803, the air conditioning system 17 and the water cooling system 16 work in conjunction, and the COP is greater than 2.

[0054] Under the combined effect of the above three operating modes, the energy storage battery thermal management system can effectively solve the energy saving problem in battery preheating and battery cooling when the ambient temperature is below 10°C. In particular, the energy saving when the ambient temperature is below 10°C saves about 2 / 3 of the energy consumption compared with the traditional air-conditioning cooling mode. In China, the average duration of ambient temperature below 10°C is 4 months / year. If it corresponds to a large-scale energy storage device, the economic benefits and value will be particularly considerable.

[0055] The above are only embodiments of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme based on their own abilities under the guidance of this application. Some typical known structures or methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the utility model, they can also make several variations and improvements, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A thermal management system for an energy storage battery, comprising an energy storage battery (5), a water cooling system (16), an air conditioning system (17), and an air conditioning pipeline (19), characterized in that: The water cooling system (16) includes: a low-temperature radiator (3), an expansion kettle (4), an electronic water pump (6), a three-way proportional valve (7), a WPTC (10), a plate heat exchanger (11), and a water cooling pipeline (18). The air conditioning pipeline (19) includes: a condenser (1), a refrigerant four-way reversing valve (8), a compressor (9), a plate heat exchanger (11), a gas-liquid separator (12), a liquid storage tank (13), and an expansion valve (14). The water cooling system (16) and the air conditioning system (17) work in coordination with each other. The plate heat exchanger (11) is provided with a plate heat exchanger port (1101), a plate heat exchanger port (2102), a plate heat exchanger port (3103), and a plate heat exchanger port (4104). Heat exchange is performed between the water cooling system (16) and the air conditioning system (17) through the plate heat exchanger (11).

2. A thermal management system for an energy storage battery according to claim 1, characterized in that: The three-way proportional valve (7) is provided with a three-way valve A port (701), a three-way valve B port (702), and a three-way valve C port (703); one end of the low-temperature radiator (3) is connected to the three-way valve A port (701) of the three-way proportional valve (7); the end of the low-temperature radiator (3) away from the three-way proportional valve (7) is connected to the electronic water pump (6); the other end of the electronic water pump (6) is connected to the energy storage battery (5); the end of the energy storage battery (5) away from the electronic water pump (6) is connected to the three-way valve B port (701) of the three-way proportional valve (7); The three-way valve C port (703) of the three-way proportional valve (7) is connected to the WPTC (10), the other end of the WPTC (10) is connected to the plate heat exchanger port 2 (1102) of the plate heat exchanger (11), the plate heat exchanger port (1101) of the plate heat exchanger (11) is connected to an end of the electronic water pump (6) away from the energy storage battery (5), and the plate heat exchanger port (1101) and the plate heat exchanger port 2 (1102) are connected inside the plate heat exchanger (11).

3. A thermal management system for an energy storage battery according to claim 2, characterized in that: The expansion kettle (4) is provided with a kettle opening (401), a kettle opening (402), and a kettle opening (403). The plate heat exchanger opening (1101) of the plate heat exchanger (11) is connected to the kettle opening (402) of the expansion kettle (4). The end of the electronic water pump (6) close to the energy storage battery (5) is connected to the kettle opening (403) of the expansion kettle (4). The end of the low-temperature radiator (3) away from the three-way proportional valve (7) is connected to the kettle opening (401) of the expansion kettle (4).

4. A thermal management system for an energy storage battery according to claim 3, characterized in that: The various components of the water cooling system (16) are connected via water cooling pipelines (18).

5. The thermal management system for an energy storage battery according to claim 1, wherein: The refrigerant four-way reversing valve (8) is provided with a four-way valve port (801), a four-way valve port (802), a four-way valve port (803), and a four-way valve port (804). One end of the condenser (1) is connected to the four-way valve port (801) of the refrigerant four-way reversing valve (8). The end of the condenser (1) away from the four-way valve port (801) is connected to the inlet end of the liquid storage tank (13). The four-way valve port (802) is connected to the inlet end of the gas-liquid separator (12). The outlet end of the gas-liquid separator (12) is connected to one end of the compressor (9). The other end of the compressor (9) is connected to the refrigerant four-way reversing valve (8). The four-way valve four ports (804) of the refrigerant four-way reversing valve (8) are connected, the three-way valve three ports (803) of the refrigerant four-way reversing valve (8) are connected to the three-port (1103) of the plate heat exchanger of the plate heat exchanger (11), the four-port (1104) of the plate heat exchanger of the plate heat exchanger (11) are connected to the inlet end of the liquid storage tank (13), the outlet end of the liquid storage tank (13) is respectively connected to the four-port (1104) of the plate heat exchanger and one end of the condenser (1) away from the one-port (801) of the four-way valve, and the three-port (1103) of the plate heat exchanger is connected to the four-port (1104) of the plate heat exchanger inside the plate heat exchanger (11).

6. A thermal management system for an energy storage battery according to claim 5, characterized in that: A second one-way valve (1502) is provided between the end of the condenser (1) away from the one port (801) of the four-way valve and the inlet end of the liquid storage tank (13), and the flow direction of the second one-way valve (1502) is from the condenser (1) to the liquid storage tank (13). A first one-way valve (1501) is provided between the four ports (1104) of the plate heat exchanger and the inlet end of the liquid storage tank (13), and the flow direction of the first one-way valve (1501) is from the four ports (1104) of the plate heat exchanger to the liquid storage tank (13). A third one-way valve (1503) is provided between the outlet of the liquid storage tank (13) and the four ports (1104) of the plate heat exchanger, and the flow direction of the third one-way valve (1503) is from the liquid storage tank (13) to the four ports (1104) of the plate heat exchanger. A fourth one-way valve (1504) is provided between the outlet of the liquid storage tank (13) and an end of the condenser (1) away from the one port (801) of the four-way valve, and the flow direction of the fourth one-way valve (1504) is from the liquid storage tank (13) to the condenser (1).

7. A thermal management system for an energy storage battery according to claim 6, characterized in that: An expansion valve (14) is provided at the outlet end of the liquid storage tank (13).

8. A thermal management system for an energy storage battery according to claim 7, characterized in that: The various components of the air-conditioning system (17) are connected via air-conditioning pipelines (19).

9. The thermal management system for an energy storage battery according to claim 1, characterized in that: The condenser (1) and the low-temperature radiator (3) are provided with a heat exchange fan (2).

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