An energy storage thermal management system and method

Abstract

The application provides an energy storage thermal management system and method, which comprises a controller, a battery, power electronic equipment and a shunt device. The controller determines a working mode of the energy storage thermal management system, which is any one of preset first, second and third modes. According to the working mode of the energy storage thermal management system, a corresponding passage of the shunt device is turned on, so that in the first mode, the battery exchanges heat in a compression refrigeration mode and the power electronic equipment exchanges heat in a liquid cooling heat exchange mode, in the second mode, the battery and the power electronic equipment respectively exchange heat in a liquid cooling heat exchange mode, and in the third mode, the power electronic equipment and / or an electric heater exchange heat with the battery. That is, according to the application, different heat exchange modes can be selected for the battery and the power electronic equipment according to different working modes, which meets the heat dissipation requirements of the battery and the power electronic equipment.

Description

Technical Field

[0001] This invention relates to the field of thermal management, and more specifically, to an energy storage thermal management system and method. Background Technology

[0002] Currently, energy storage system containers or battery cabinets are mostly composed of batteries as a single energy storage component. However, with the development of the energy storage industry, more and more energy storage systems are moving towards fully prefabricated designs, such as incorporating power electronic devices like PCS (Power Conversion System) into containers or battery cabinets.

[0003] If batteries and power electronic devices such as PCS are housed in the same container or battery cabinet, the heat dissipation requirements of the batteries and power electronic devices differ. Therefore, how to simultaneously meet the heat dissipation requirements of both batteries and power electronic devices is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides an energy storage thermal management system and method to solve the problem of simultaneously meeting the heat dissipation requirements of batteries and power electronic devices.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An energy storage thermal management system includes a controller, a coolant passage for a battery, a coolant passage for power electronic equipment, and a diversion device;

[0007] The controller is used to determine the operating mode of the energy storage thermal management system, which is any one of a preset first mode, second mode, and third mode; according to the operating mode of the energy storage thermal management system, it controls the corresponding path of the shunt device to be turned on, so that when the operating mode is the first mode, the battery uses compression cooling for heat exchange and the power electronic equipment uses liquid cooling for heat exchange; when the operating mode is the second mode, the battery and the power electronic equipment respectively use liquid cooling for heat exchange; when the operating mode is the third mode, the battery and the power electronic equipment exchange heat, and / or the battery and the electric heater exchange heat.

[0008] Optionally, in the aforementioned energy storage thermal management system, the compression refrigeration circuit and the liquid cooling circuit where the power electronic equipment is located share a liquid-cooled condenser, and the energy storage thermal management system exchanges heat through fluid.

[0009] Optionally, the heat dissipation circuit of the aforementioned energy storage thermal management system includes a compression refrigeration circuit and a liquid cooling circuit.

[0010] Optionally, in the above-mentioned energy storage thermal management system, when the working mode is the first mode, the condenser used in the compression refrigeration method is a liquid-cooled condenser, and the liquid-cooled condenser and the power electronic equipment are in the same liquid-cooling circuit.

[0011] Optionally, in the aforementioned energy storage thermal management system, the liquid-cooled condenser and the power electronic equipment are connected in series in the liquid-cooling circuit.

[0012] Optionally, the energy storage thermal management system described above includes at least one set of heat exchangers, and the controller is used for:

[0013] The corresponding path of the shunt device is controlled to be turned on, so that the power electronic equipment, the at least one set of heat exchangers, the shunt device and the liquid-cooled condenser are connected to form a second liquid-cooled circuit, so that the power electronic equipment can dissipate heat by liquid-cooled heat exchange; the battery, the shunt device and the evaporator in the compression refrigeration circuit are connected to form a first liquid-cooled circuit, so that the battery can dissipate heat by compression refrigeration.

[0014] Optionally, in the aforementioned energy storage thermal management system, the diversion device includes valve assemblies with multiple preset passages; the controller is used to control the corresponding passages in the valve assemblies with multiple preset passages to be open, so that the power electronic equipment, the diversion device, the liquid-cooled condenser, and the at least one set of heat exchangers are connected to form the second liquid-cooled circuit; and so that the battery, the diversion device, and the evaporator in the compression refrigeration circuit are connected to form the first liquid-cooled circuit.

[0015] Optionally, in the aforementioned energy storage thermal management system, the liquid-cooled condenser and the power electronic equipment are connected in parallel in the liquid-cooling circuit;

[0016] If the energy storage thermal management system includes at least one set of heat exchangers and the diversion device includes valve assemblies with multiple preset passages, the low-temperature coolant output from the at least one set of heat exchangers is diverted through the valve assembly of at least one preset passage in the diversion device and flows through the coolant channels of the liquid-cooled condenser and the power electronic equipment, respectively.

[0017] Optionally, in the above-mentioned energy storage thermal management system, when the working mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on, forming a third liquid cooling circuit including the battery and a fourth liquid cooling circuit including the power electronic equipment; the third liquid cooling circuit and the fourth liquid cooling circuit are independent of each other.

[0018] Optionally, the energy storage thermal management system described above includes two sets of heat exchangers, one set of which is located in the third liquid cooling circuit, and the other set of which is located in the fourth liquid cooling circuit.

[0019] Optionally, the energy storage thermal management system described above includes at least one set of heat exchangers.

[0020] When the operating mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on to form a fifth liquid cooling circuit; the battery and the power electronic device are connected in series in the fifth liquid cooling circuit and share the heat exchanger for heat dissipation.

[0021] Optionally, the energy storage thermal management system described above includes at least one set of heat exchangers.

[0022] When the operating mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on to form a sixth liquid cooling circuit; the battery and the power electronic equipment are connected in parallel in the sixth liquid cooling circuit and share the heat exchanger for heat dissipation.

[0023] Optionally, in the above-mentioned energy storage thermal management system, when the working mode is the third mode, the battery is placed on the battery cold plate, the power electronic device is placed on the power electronic device cold plate, and the controller controls the corresponding path of the shunt device to be turned on, so that the battery cold plate, the power electronic device cold plate and the shunt device are connected to form a seventh liquid cooling circuit, so as to use the heat of the power electronic device to heat the battery.

[0024] Optionally, in the aforementioned energy storage thermal management system, the electric heater is disposed in the seventh liquid cooling circuit, and the controller is further configured to use the electric heater to heat the battery and the power electronic equipment.

[0025] Optionally, in the case of the third working mode, the above-mentioned energy storage thermal management system controls the corresponding path of the shunt device to be turned on, so that the electric heater, the battery and the shunt device are connected to form an eighth liquid cooling circuit, so as to use the electric heater to heat the battery.

[0026] A thermal energy storage management method is applied to a controller in the aforementioned thermal energy storage management system, the thermal energy storage management method comprising:

[0027] If the energy storage thermal management system is found to meet the preset working mode switching conditions, the current working mode of the energy storage thermal management system is determined; the working mode is one of the first working mode, the second working mode, and the third working mode.

[0028] The corresponding pathway of the shunt device is controlled to be activated according to the working mode of the energy storage thermal management system, so that when the working mode is the first mode, the battery uses compression cooling for heat exchange and the power electronic equipment uses liquid cooling for heat exchange; when the working mode is the second mode, the battery and the power electronic equipment respectively use liquid cooling for heat exchange; when the working mode is the third mode, the battery and the power electronic equipment exchange heat, and / or the battery and the electric heater exchange heat.

[0029] Optionally, in the above-described energy storage thermal management method, the process of detecting that the energy storage thermal management system meets preset operating mode switching conditions includes:

[0030] Obtain the current ambient temperature and determine the previous operating mode of the energy storage thermal management system;

[0031] If the current ambient temperature is not within the temperature range corresponding to the previous working mode, and the minimum temperature difference between the current ambient temperature and the temperature range is greater than the preset hysteresis threshold, then the energy storage thermal management system is determined to meet the preset working mode switching conditions.

[0032] Optionally, in the above-described energy storage thermal management method, determining the current operating mode of the energy storage thermal management system includes:

[0033] Get the current ambient temperature;

[0034] Determine the target temperature range within which the current ambient temperature falls;

[0035] The operating mode corresponding to the target temperature range is determined as the current operating mode of the energy storage thermal management system.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This invention provides an energy storage thermal management system and method. The energy storage thermal management system includes a controller, a battery, power electronic devices, and a shunt device. The controller determines the operating mode of the energy storage management system, which can be any one of a preset first mode, second mode, and third mode. Based on the operating mode of the energy storage thermal management system, the controller controls the corresponding pathway of the shunt device to be activated. In the first mode, the battery uses compression cooling for heat exchange, and the power electronic devices use liquid cooling for heat exchange. In the second mode, both the battery and the power electronic devices use liquid cooling for heat exchange. In the third mode, the power electronic devices and / or electric heaters exchange heat with the battery. In other words, this invention achieves heat dissipation for the battery and power electronic devices in three modes (high, medium, and low), and selects different heat dissipation methods according to different operating modes, meeting the heat dissipation requirements of the battery and power electronic devices and solving the problem of simultaneously meeting the heat dissipation needs of both batteries and power electronic devices. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of an energy storage thermal management system provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of another energy storage thermal management system provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of another energy storage thermal management system provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of another energy storage thermal management system provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the fifth energy storage thermal management system provided in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the sixth type of energy storage thermal management system provided in an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of the seventh energy storage thermal management system provided in the embodiments of the present invention;

[0046] Figure 8 This is a schematic diagram of the structure of the eighth energy storage thermal management system provided in the embodiments of the present invention;

[0047] Figure 9 This is a schematic diagram of the structure of the ninth type of energy storage thermal management system provided in an embodiment of the present invention;

[0048] Figure 10 This is a schematic diagram of the tenth type of energy storage thermal management system provided in an embodiment of the present invention;

[0049] Figure 11 This is a schematic diagram of the eleventh type of energy storage thermal management system provided in an embodiment of the present invention;

[0050] Figure 12 This is a schematic diagram of the structure of the twelfth type of energy storage thermal management system provided in an embodiment of the present invention;

[0051] Figure 13 This is a schematic diagram of the thirteenth energy storage thermal management system provided in an embodiment of the present invention;

[0052] Figure 14 This is a schematic diagram of the structure of the fourteenth energy storage thermal management system provided in this embodiment of the invention;

[0053] Figure 15 This is a schematic diagram of the structure of the fifteenth type of energy storage thermal management system provided in an embodiment of the present invention;

[0054] Figure 16 A flowchart of an energy storage thermal management method provided in an embodiment of the present invention. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Currently, energy storage system containers or battery cabinets are mostly composed of a single energy storage component: a battery. The battery typically uses a liquid-cooled thermal management system for heat dissipation. This system consists of a liquid-cooled chiller (including a compressor, condenser, throttling device, heat exchanger, water pump, water tank, and related piping controllers), a piping system, and cold plates. The liquid-cooled chiller is the core of the system, providing power for the coolant circulation and dissipating the heat carried by the coolant into the air. The liquid-cooled thermal management system comprises two loops: a coolant circulation loop and a refrigerant circulation loop. The low-temperature coolant absorbs heat from the battery in the cold plates, increasing its temperature. The heat is then transferred to the refrigerant through the heat exchanger, becoming a low-temperature coolant. The liquid refrigerant absorbs heat from the coolant in the heat exchanger, vaporizing into a gas. This gas is then compressed into a high-temperature, high-pressure gas by the compressor. The high-temperature, high-pressure gaseous refrigerant dissipates heat into the air in the condenser, liquefies into a high-pressure liquid, and then passes through the throttling device to become a low-temperature, low-pressure liquid refrigerant, which then enters the heat exchanger to dissipate heat from the coolant.

[0057] Using a liquid-cooled thermal management system for heat dissipation is effective for cooling a single battery. However, with the development of the energy storage industry, more and more energy storage systems are moving towards fully prefabricated designs, such as housing power electronic devices like PCS (Power Conversion System) within containers or battery cabinets.

[0058] If batteries and power electronic devices such as PCS are housed in the same container or battery cabinet, their heat dissipation requirements differ. For example, batteries typically require coolant temperatures around 18°C, while power electronic devices generally require coolant temperatures around 50°C. If a liquid-cooled thermal management system is used to dissipate heat for both batteries and power electronic devices simultaneously, the coolant temperature for the power electronic devices will be around 20°C, resulting in low system efficiency and high cost.

[0059] Furthermore, because liquid-cooled units require high heat dissipation capacity from their condensers, the condensers are generally large, resulting in a large overall size for the liquid-cooled unit. Additionally, since the condenser needs to carry high-pressure refrigerant, the piping typically uses welded connections to ensure system reliability. Therefore, liquid-cooled units cannot be manufactured as modular units, and the space utilization of the energy storage system cannot be maximized.

[0060] Therefore, how to simultaneously meet the heat dissipation requirements of batteries and power electronic devices is a technical problem that urgently needs to be solved by those skilled in the art.

[0061] To address this, the present invention provides an energy storage thermal management system and method. The energy storage thermal management system includes a controller, a battery, power electronic devices, and a shunt device. The controller can determine the operating mode of the energy storage management system, which is any one of a preset first mode, second mode, and third mode. Based on the operating mode of the energy storage thermal management system, the controller controls the corresponding pathway of the shunt device to be activated. In the first operating mode, the battery uses compression cooling for heat exchange, and the power electronic devices use liquid cooling for heat exchange. In the second operating mode, both the battery and the power electronic devices use liquid cooling for heat exchange. In the third operating mode, the battery and the power electronic devices exchange heat, and / or the battery exchanges heat with an electric heater. In other words, this invention achieves heat dissipation for the battery and power electronic devices in different modes, and selects different heat dissipation methods according to different operating modes, meeting the heat dissipation requirements of the battery and power electronic devices, and solving the problem of simultaneously meeting the heat dissipation requirements of both batteries and power electronic devices.

[0062] In this embodiment, the energy storage thermal management system can simultaneously provide corresponding heat exchange methods for the battery and power electronic devices under different modes. The system has multiple operating modes, such as a first mode, a second mode, and a third mode, which are switched according to the ambient temperature. The switching between different functional modes is achieved through a shunt device.

[0063] Based on the above, embodiments of the present invention provide an energy storage thermal management system, referring to... Figure 1 The energy storage thermal management system includes a controller 11, a battery 12, a power electronic device 13, and a diversion device 14; in this embodiment, the diversion device 14 may include at least one solenoid valve with a preset passage, such as a multi-way valve.

[0064] The controller 11 is configured to control the corresponding path of the shunt device to be turned on according to the working mode of the energy storage thermal management system, so that when the working mode is the first mode, the battery uses compression cooling to exchange heat and the power electronic equipment uses liquid cooling to exchange heat; when the working mode is the second mode, the battery and the power electronic equipment respectively use liquid cooling to exchange heat; and when the working mode is the third mode, the battery and the power electronic equipment exchange heat, and / or the battery and the electric heater exchange heat.

[0065] Optionally, the controller can determine the current operating mode of the energy storage thermal management system based on the current ambient temperature range. The first mode can be a high temperature mode, the second mode can be a medium temperature mode, and the third mode can be a low temperature mode.

[0066] In this embodiment, the power electronic device may include one or more of the following: PCS, DC / DC converter module, and switch box.

[0067] In this embodiment, in the first mode, the battery 12 can dissipate heat using compression cooling, and the power electronic device 13 can dissipate heat using liquid cooling heat exchange. In the second mode, both the battery 12 and the power electronic device 13 can dissipate heat using liquid cooling heat exchange. In the third mode, the heat from the power electronic device 13 can be used to heat the battery.

[0068] In this embodiment, the battery and power electronic equipment can exchange heat in different modes, and different heat exchange methods are selected according to different operating modes, which meets the heat dissipation requirements of the battery and power electronic equipment and solves the problem of needing to meet the heat dissipation requirements of the battery and power electronic equipment at the same time.

[0069] In one embodiment of the present invention, the energy storage thermal management system may include a compression refrigeration circuit and a liquid cooling circuit.

[0070] Optionally, the compression refrigeration circuit may include a compressor, an evaporator, a condenser, and a throttling valve, wherein the condenser may be a liquid-cooled condenser. The controller can control the conduction of different preset paths in the distribution device, thereby forming different liquid-cooled circuits. The number of liquid-cooled circuits can be one or more, and each liquid-cooled circuit can consist of at least one of a battery and power electronic devices. The battery and power electronic devices can be in the same or different liquid-cooled circuits. Each liquid-cooled circuit may be equipped with at least one water pump to power the coolant in the liquid-cooled circuit.

[0071] In this embodiment, the battery and power electronic device can each be provided with a coolant channel. The coolant channel of the battery can be a battery cold plate, and the coolant channel of the power electronic device can be a power electronic device cold plate. The shunt device can include a multi-way valve or multiple valve assemblies, and the multi-way valve includes multiple passage nodes. One end of the coolant channel of the battery can be connected to the first passage node of the shunt device, and the other end can be connected to the second passage node of the shunt device in sequence through a first water pump and an evaporator. One end of the coolant channel of the power electronic device is connected to the third passage node of the shunt device, and the other end of the coolant channel of the power electronic device is connected to the fourth passage node of the shunt device. One end of the liquid cooling channel of the condenser of the compression refrigeration circuit can be connected to the fifth passage node of the shunt device, and the other end can be connected to the sixth passage node of the shunt device.

[0072] In this embodiment, the controller can control the shunt device to open a preset path corresponding to the operating mode. For example, when the shunt device is a multi-way valve, the controller can control the connection of the corresponding path nodes of the shunt device to open the preset path, thereby forming a liquid cooling circuit corresponding to the operating mode, thus meeting the heat exchange requirements of batteries and power electronic devices in different modes.

[0073] In some embodiments, the controller can control the opening of a preset path of the shunt device so that the power electronic equipment and the liquid-cooled condenser are in the same liquid-cooling circuit.

[0074] In this embodiment, the compression refrigeration circuit in the energy storage thermal management system and the liquid cooling circuit where the power electronic equipment is located can share a liquid cooling condenser. The energy storage thermal management system can exchange heat through a fluid, which can be a coolant. The fact that the compression refrigeration circuit and the liquid cooling circuit where the power electronic equipment is located can share a liquid cooling condenser can effectively save hardware costs and hardware layout space, improve the heat exchange efficiency of the power electronic equipment, and meet the heat exchange requirements of the power electronic equipment in different operating modes.

[0075] In some embodiments, the controller can determine the current operating mode of the energy storage thermal management system when it detects that the energy storage thermal management system meets preset operating mode switching conditions.

[0076] The above embodiments mention three operating modes, namely the first mode, the second mode and the third mode. The specific heat exchange method between the battery and the power electronic equipment under each operating mode will now be described.

[0077] In this embodiment, the heat dissipation circuit of the energy storage thermal management system can be divided into a compression refrigeration circuit and a liquid cooling circuit, so that the battery and power electronic equipment can select different heat exchange methods for heat exchange. However, in practical applications, in certain operating modes, a certain circuit, such as the compression refrigeration circuit, may or may not operate, depending on the actual situation.

[0078] 1. First mode.

[0079] In another embodiment of the present invention, the condenser used in the compression refrigeration method is a liquid-cooled condenser, and the liquid-cooled condenser and the power electronic equipment are in the same liquid-cooling circuit.

[0080] Depending on the specific scenario, the liquid-cooled condenser and the power electronic equipment are connected in series; alternatively, they can be connected in parallel. This embodiment first describes the case where the liquid-cooled condenser and the power electronic equipment are connected in series.

[0081] In some embodiments, in a first mode, the energy storage thermal management system includes at least one set of heat exchangers, and the controller controls the corresponding passage of the shunt device to be opened, so that the battery, the shunt device and the evaporator in the compression refrigeration circuit are connected to form a first liquid cooling circuit, so that the battery can dissipate heat by compression refrigeration; and so that the power electronic equipment, the at least one set of heat exchangers, the shunt device and the liquid cooling condenser are connected to form a second liquid cooling circuit, so that the power electronic equipment can dissipate heat by liquid cooling heat exchange.

[0082] Optionally, in the first mode, the controller can control the diversion device to open the path corresponding to the first mode, thereby forming a first liquid cooling circuit and a second liquid cooling circuit. The first liquid cooling circuit may include a battery, a first water pump, and an evaporator in the compression refrigeration circuit. The second liquid cooling circuit may include power electronic equipment, a second water pump, at least one set of heat exchangers, and a liquid cooling condenser in the compression refrigeration circuit. The power electronic equipment and the liquid cooling condenser may be connected in series or in parallel in the second liquid cooling circuit.

[0083] In this embodiment, the controller can start the compressor in the compression refrigeration circuit, the first water pump in the first liquid cooling circuit, the second water pump in the second liquid cooling circuit, and the heat exchanger, thereby enabling the battery to exchange heat using compression refrigeration and the power electronic equipment to exchange heat using liquid cooling heat exchange.

[0084] Specific reference Figure 2 The energy storage thermal management system contains: 2 sets of heat exchangers, 2 water pumps, 1 flow distribution device, which is a 10-way valve (or a valve group composed of multiple valves), batteries, power electronic equipment, and a set of compression refrigeration circuit.

[0085] The energy storage thermal management system has three loops: the first liquid cooling loop, the compression refrigeration loop, and the second liquid cooling loop. Figure 2A schematic diagram of the first mode system is provided. The flow divider includes a 10-way valve. In the 10-way valve, path node 1 connects to path node 2, path node 3 connects to path node 4, path node 5 connects to path node 6, path node 8 connects to path node 9, and path node 7 connects to path node 10. The first liquid cooling circuit is formed by connecting water pump 1, evaporator, battery, piping, and the flow divider. The low-temperature coolant heats up after passing through the battery cold plate to dissipate heat from the battery, and then flows through the evaporator to transfer heat to the refrigerant, where its temperature decreases. The compression refrigeration circuit consists of a compressor, evaporator, liquid-cooled condenser, and throttling device. The low-temperature liquid refrigerant absorbs heat from the first liquid cooling circuit in the evaporator and vaporizes into a gaseous state. It is then compressed into a high-temperature, high-pressure gaseous state by the compressor, flows through the liquid-cooled condenser to transfer heat to the second liquid cooling circuit, liquefies into a high-temperature, high-pressure liquid state, and then becomes a low-temperature, low-pressure liquid state after passing through the throttling device. The second liquid cooling circuit can be formed by connecting two sets of heat exchangers (heat exchangers 1 and 2), a liquid cooling condenser, a water pump 2, power electronic equipment, pipelines and a distribution device. The low-temperature coolant first flows through the liquid cooling condenser to dissipate heat and increase its temperature. Then it flows through the cold plate of the power electronic equipment to dissipate heat for the power electronic equipment. Finally, it flows through the two sets of heat exchangers to dissipate heat to the air and decrease its temperature.

[0086] Reference Figure 3 , Figure 3 The system includes a heat exchanger, and the energy storage thermal management system contains: a heat exchanger, two water pumps, an 8-way valve as a flow divider (the flow divider can also be a valve group composed of multiple valves), a battery, power electronic equipment, and a compression refrigeration circuit.

[0087] The energy storage thermal management system has three loops: the first liquid cooling loop, the compression refrigeration loop, and the second liquid cooling loop. Figure 3 The schematic diagram of the first mode system is given. The flow divider includes an 8-way valve. In the 8-way valve, path node 1 connects to path node 6, path node 2 connects to path node 3, path node 4 connects to path node 5, and path node 7 connects to path node 8. The first liquid cooling circuit is formed by connecting water pump 1, evaporator, battery, pipelines, and the flow divider. The low-temperature coolant heats up after passing through the battery cold plate to dissipate heat from the battery, and then flows through the evaporator to transfer heat to the refrigerant, thus lowering its temperature. The compression refrigeration circuit consists of a compressor, evaporator, liquid-cooled condenser, and throttling device. The low-temperature liquid refrigerant absorbs heat from the first liquid cooling circuit in the evaporator and vaporizes into a gaseous state. It is then compressed into a high-temperature, high-pressure gaseous state by the compressor, and then flows through the liquid-cooled condenser to transfer heat to the second liquid cooling circuit, where it liquefies into a high-temperature, high-pressure liquid state. Finally, it becomes a low-temperature, low-pressure liquid state after passing through the throttling device. The second liquid cooling circuit is formed by connecting a heat exchanger, a liquid cooling condenser, a water pump 2, power electronic equipment, pipelines, and a distribution device. The low-temperature coolant first flows through the liquid cooling condenser to dissipate heat and increase its temperature. Then it flows through the cold plate of the power electronic equipment to dissipate heat and finally flows through the heat exchanger to dissipate heat to the air and decrease its temperature.

[0088] In another implementation of the present invention, the energy storage thermal management system may also have other implementations. Specifically, if the diversion device in the energy storage thermal management system includes multiple preset path solenoid valves, the controller controls the corresponding path in the valve assembly of the multiple preset paths to be open, so that the power electronic equipment, the diversion device, the liquid-cooled condenser, and the at least one set of heat exchangers are connected to form the second liquid-cooled circuit; and the battery, the diversion device, and the evaporator in the compression refrigeration circuit are connected to form the first liquid-cooled circuit. In this embodiment, the first liquid-cooled circuit and the compression refrigeration circuit use the same evaporator; the power electronic equipment is located in the second liquid-cooled circuit and can dissipate heat through the heat exchanger.

[0089] Reference Figure 4 The entire energy storage thermal management system includes: one heat exchanger, two water pumps, one 10-way valve (or a valve group composed of multiple valves), two three-way pipes or three-way valves, batteries, power electronic equipment, and one compression refrigeration circuit. The entire energy storage thermal management system has three circuits, including a compression refrigeration circuit, a first liquid cooling circuit, and a second liquid cooling circuit. Figure 4 The schematic diagram of the first mode system is given. The flow divider includes a 10-way valve. Node 1 of the 10-way valve connects to node 7, node 3 connects to node 4, node 5 connects to node 6, and node 8 connects to node 9. The first liquid cooling circuit is formed by connecting a water pump 1, an evaporator, a battery, piping, and the flow divider. The low-temperature coolant passes through the battery cooling plate to dissipate heat from the battery, increasing its temperature. It then flows through the evaporator to transfer heat to the refrigerant, decreasing its temperature. The compression refrigeration circuit consists of a compressor, an evaporator, a liquid-cooled condenser, and a throttling device. The low-temperature liquid refrigerant absorbs heat from the first liquid cooling circuit in the evaporator and vaporizes into a gaseous state. It is then compressed into a high-temperature, high-pressure gaseous state by the compressor, flows through the liquid-cooled condenser to transfer heat to the power electronic equipment, liquefies into a high-temperature, high-pressure liquid state, and finally becomes a low-temperature, low-pressure liquid state after passing through the throttling device. The second liquid cooling circuit is formed by connecting a heat exchanger, a liquid cooling condenser, a water pump 2, power electronic equipment, pipelines, and a distribution device. The low-temperature coolant first flows through the liquid cooling condenser to dissipate heat and increase its temperature. Then it flows through the cold plate of the power electronic equipment to dissipate heat and finally flows through the heat exchanger to dissipate heat to the air and decrease its temperature.

[0090] In another implementation of the present invention, when the liquid-cooled condenser and the power electronic device are connected in parallel, if the energy storage thermal management system includes at least one set of heat exchangers and the diversion device includes valve assemblies with multiple preset passages, the low-temperature coolant output from the at least one set of heat exchangers is diverted through the designated valve assembly in the diversion device and flows through the coolant channels of the liquid-cooled condenser and the power electronic device respectively. The coolant channel of the power electronic device may be the cold plate of the power electronic device.

[0091] Specifically, refer to Figure 5 The entire energy storage thermal management system contains two heat exchangers, two water pumps, one 10-way valve (or a valve group composed of multiple valves), two three-way pipes or three-way valves, batteries, power electronic equipment, and one compression refrigeration circuit. The entire energy storage thermal management system has three circuits, including a first liquid cooling circuit, a compression refrigeration circuit, and a second liquid cooling circuit. Figure 5 The schematic diagram of the first mode system is given. The flow divider includes a 10-way valve. Node 9 of the 10-way valve connects to node 10, node 2 connects to node 3, node 1 connects to node 8, node 4 connects to node 5, and node 6 connects to node 7. The first liquid cooling circuit is formed by connecting water pump 1, evaporator, battery, piping, and the flow divider. The low-temperature coolant passes through the battery cold plate to dissipate heat from the battery, increasing its temperature. It then flows through the evaporator to transfer heat to the refrigerant, decreasing its temperature. The compression refrigeration circuit consists of a compressor, evaporator, liquid-cooled condenser, and throttling device. The low-temperature liquid refrigerant absorbs heat from the battery in the evaporator and vaporizes into a gaseous state. It is then compressed by the compressor into a high-temperature, high-pressure gaseous state, flowing through the liquid-cooled condenser to transfer heat to the second liquid cooling circuit, liquefying into a high-temperature, high-pressure liquid state. Finally, it passes through the throttling device to become a low-temperature, low-pressure liquid state. The second liquid cooling circuit is formed by connecting two sets of heat exchangers, a liquid-cooled condenser, two three-way pipes or three-way water valves, water pump 2, power electronic equipment cold plates, piping, and the flow divider. The low-temperature coolant flowing out of the heat exchanger is divided into two paths through a three-way pipe or three-way valve. One path is for heat dissipation of the liquid-cooled condenser, and the other path is for heat dissipation of the power electronic equipment. The two paths are then merged into one path through another three-way pipe or three-way valve, and flow through heat exchanger 2 and heat exchanger 1 in sequence to dissipate heat to the ambient air and reduce the temperature.

[0092] As described above, in the first mode, the battery uses compression refrigeration for heat dissipation, while the power electronic equipment uses liquid cooling heat exchange. The condenser in the compression refrigeration circuit is a liquid-cooled condenser, and it is located within the same liquid cooling circuit as the power electronic equipment. Coolant from the second liquid cooling circuit is used to dissipate heat from the condenser in the compression refrigeration circuit. In the first mode, there are two possible connection methods between the liquid-cooled condenser and the power electronic equipment:

[0093] 1) The liquid-cooled condenser and the power electronic equipment can be connected in series. The coolant first flows through the liquid-cooled condenser and then through the cold plate of the power electronic equipment, thereby dissipating heat for the power electronic equipment.

[0094] 2) The liquid-cooled condenser and the power electronic equipment can also be connected in parallel. The coolant is divided into two paths through a 3-way pipe, one path enters the liquid-cooled condenser and the other path enters the cold plate of the power electronic equipment.

[0095] 2. Second mode.

[0096] In the second mode, the architecture of the entire energy storage thermal management system can be the same as that in the first mode, but the connection method of the shunt device and the working mode of each loop are different, which will be introduced separately below.

[0097] 2.1) In the second mode, when the operating mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on, forming a third liquid-cooled circuit including the battery and a fourth liquid-cooled circuit including the power electronic device; the third liquid-cooled circuit and the fourth liquid-cooled circuit are independent of each other. In some embodiments, the energy storage thermal management system includes two sets of heat exchangers, one of which is located in the third liquid-cooled circuit and the other is located in the fourth liquid-cooled circuit.

[0098] In this embodiment, the battery can be cooled by liquid cooling heat exchange through the third liquid cooling circuit; the power electronic equipment can be cooled by liquid cooling heat exchange through the fourth liquid cooling circuit.

[0099] Optionally, the energy storage thermal management system may include at least two sets of heat exchangers. In this case, the first heat exchanger of the at least two sets of heat exchangers is located in a third liquid cooling circuit, and the second heat exchanger of the at least two sets of heat exchangers is located in a fourth liquid cooling circuit. The first heat exchanger may be any heat exchanger in the at least two sets of heat exchangers, and the second heat exchanger may be any heat exchanger other than the first heat exchanger.

[0100] If the architecture of the energy storage thermal management system adopts Figure 2 For the architecture, the specific heat dissipation method in the second mode is as follows: Figure 6 . Figure 6The system schematic diagram for the second mode is provided. In this mode, the distribution device includes a 10-way valve. Node 9 of the 10-way valve connects to node 10, node 1 connects to node 8, node 2 connects to node 7, node 3 connects to node 4, and node 5 connects to node 6. The compression refrigeration circuit is not operational, and both the battery and power electronic equipment use heat exchange for cooling. Water pump 1, heat exchanger 1, the battery, piping, and the distribution device form the third liquid-cooled circuit. The low-temperature coolant enters the battery cold plate to dissipate heat and raise the battery temperature, then enters heat exchanger 1 to dissipate heat to the ambient air, lowering the temperature. Water pump 2, heat exchanger 2, power electronic equipment, and piping constitute the fourth liquid-cooled circuit. The low-temperature coolant enters the power electronic equipment cold plate to dissipate heat and raise the temperature, then enters heat exchanger 2 to dissipate heat to the ambient air, lowering the temperature.

[0101] Furthermore, if the architecture of the entire energy storage thermal management system adopts Figure 5 For the architecture, the specific heat dissipation method in the second mode is as follows: Figure 7 . Figure 7 The system schematic diagram for the second mode is provided. In this mode, the flow divider includes a 10-way valve. Node 1 of the 10-way valve connects to node 10, node 2 connects to node 9, node 3 connects to node 8, node 4 connects to node 5, and node 6 connects to node 7. The compression refrigeration circuit is not operational, and both the battery and power electronic equipment use liquid cooling heat exchange for heat dissipation. Water pump 1, the battery, heat exchanger 1, and piping constitute the third liquid cooling circuit. The low-temperature coolant enters the battery cold plate to dissipate heat and raise the battery temperature, then enters heat exchanger 1 to dissipate heat to the ambient air, lowering the temperature. Water pump 2, heat exchanger 2, power electronic equipment, piping, and the flow divider are connected to form the fourth liquid cooling circuit. The low-temperature coolant enters the power electronic equipment cold plate to dissipate heat and raise the temperature, then enters heat exchanger 2 to dissipate heat to the ambient air, lowering the temperature.

[0102] 2.2) In the second mode, the controller controls the corresponding path of the shunt device to be turned on, forming a fifth liquid-cooled circuit; the battery and the power electronic equipment are connected in series in the fifth liquid-cooled circuit and share the same heat exchanger for heat dissipation. In this embodiment, the fifth liquid-cooled circuit enables the battery and power electronic equipment to dissipate heat through liquid-cooled heat exchange.

[0103] If the architecture of the entire energy storage thermal management system adopts Figure 3 For the architecture, the specific heat dissipation method in the second mode is as follows: Figure 8 . Figure 8The system schematic diagram for the second mode is provided. In this mode, the distribution device includes an 8-way valve. Node 1 of the 8-way valve connects to node 8, node 2 connects to node 3, and node 4 connects to node 7. The compression refrigeration circuit is not operational. Both the battery and power electronic equipment use liquid cooling heat exchange for heat dissipation. Water pump 2 is shielded by the 8-way valve. The battery, power electronic equipment, water pump 1, heat exchanger, and distribution device are connected to form a fifth liquid cooling circuit, with water pump 1 providing the driving force for the circuit. The low-temperature coolant enters the battery cold plate to dissipate heat and raise its temperature, then enters the power electronic equipment cold plate to further raise its temperature. Finally, the high-temperature coolant enters the heat exchanger to dissipate heat to the ambient air, lowering its temperature.

[0104] 2.3) The energy storage thermal management system includes at least one set of heat exchangers; in the second operating mode, the controller controls the corresponding path of the shunt device to be turned on, forming a sixth liquid cooling circuit; the battery and power electronic equipment are connected in parallel in the sixth liquid cooling circuit and share the heat exchangers for heat dissipation. In this embodiment, the sixth liquid cooling circuit enables the battery and power electronic equipment to dissipate heat through liquid cooling heat exchange.

[0105] If the architecture of the entire energy storage thermal management system adopts Figure 4 For the architecture, the specific heat dissipation method in the second mode is as follows: Figure 9 . Figure 9 The system schematic diagram for the second mode is provided. In this mode, the distribution device includes a 10-way valve. Node 1 of the 10-way valve connects to node 7, node 2 connects to node 8, node 3 connects to node 4, node 5 connects to node 6, and node 9 connects to node 10. The compression refrigeration circuit is not operational, and both the battery and power electronic equipment use liquid cooling heat exchange for heat dissipation. The sixth liquid cooling circuit is formed by connecting water pump 1, the battery, water pump 2, power electronic equipment, multiple three-way pipes or three-way valves, and the distribution device. The cryogenic coolant flows out of the heat exchanger and is divided into two paths through a three-way valve. One path flows through the battery cold plate to dissipate heat from the battery, and the other path flows through the power electronic equipment cold plate to dissipate heat from the battery. The two paths then merge back into the first path through a three-way pipe or three-way valve and enter the heat exchanger, dissipating heat to the environment and lowering the temperature.

[0106] In summary, in the second mode, the compression refrigeration system does not operate, and both the battery and power electronic equipment use liquid cooling heat exchange for heat dissipation, specifically including the following implementation methods:

[0107] 1) The liquid cooling circuit where the battery is located and the liquid cooling circuit where the power electronic equipment is located are independent of each other, and each liquid cooling circuit includes at least one set of heat exchangers.

[0108] 2) The battery and power electronic equipment share a liquid cooling circuit (the fifth liquid cooling circuit), and the battery and power electronic equipment are connected in series in this liquid cooling circuit. The battery and power electronic equipment share at least one set of heat exchangers for heat dissipation.

[0109] 3) The battery and the power electronic equipment share a liquid cooling circuit (sixth liquid cooling circuit), and the battery and the power electronic equipment are connected in parallel in this liquid cooling circuit. The battery and the power electronic equipment share at least one set of heat exchangers for heat dissipation.

[0110] 3. The third mode.

[0111] In the third mode, the controller controls the corresponding path of the shunt device to be turned on, so that the battery, the power electronic device and the shunt device are connected to form a seventh liquid cooling circuit, so as to use the heat of the power electronic device to heat the battery.

[0112] In this embodiment, the seventh liquid cooling circuit includes at least one water pump. The battery can be mounted on the battery cold plate, so that the battery cold plate serves as the coolant channel for the battery. The power electronic device can be mounted on the power electronic device cold plate, so that the power electronic device serves as the coolant channel for the power electronic device.

[0113] Specifically, in the third mode, the architecture of the energy storage thermal management system can be the same as in the first mode, but the connection method of the valve group and the working method of each circuit are different, which will be introduced separately below.

[0114] Figure 10 The schematic diagram of the third mode system is given. In this mode, the compression refrigeration circuit does not operate. The 10-way valve's path node 9 connects to path node 4, and path node 8 connects to path node 5. Water pump 2, heat exchanger 1, and heat exchanger 2 are shielded from the system. The battery is connected to the power electronic equipment through a shunt device, forming the seventh liquid-cooled circuit. Water pump 1 provides driving force for the circuit. The heat from the power electronic equipment is transferred to the coolant through the power electronic equipment's cold plate, raising the coolant temperature. The high-temperature coolant then enters the battery's cold plate to heat the battery.

[0115] Figure 11 A schematic diagram of another third-mode system is provided. In this mode, the compression refrigeration circuit is not operational. Node 3 of the 8-way valve connects to node 8, and node 4 connects to node 7. Water pump 2 and the heat exchanger are shielded from the system. The battery is connected to the power electronics equipment via a shunt device, forming a seventh liquid-cooled circuit. Water pump 1 provides the driving force for the circuit. The heat from the power electronics equipment is transferred to the coolant through the power electronics equipment's cold plate, raising the coolant temperature. The high-temperature coolant then enters the battery's cold plate to heat the battery.

[0116] Figure 12A schematic diagram of another third-mode system is provided. In this mode, the compression refrigeration circuit is not operational. Node 4 of the 10-way valve connects to node 9, and node 5 connects to node 8. Water pump 2 and the heat exchanger are shielded from the system. The battery is connected to the power electronics equipment via a shunt device, forming a seventh liquid-cooled circuit. Water pump 1 provides the driving force for the circuit. The heat from the power electronics equipment is transferred to the coolant through the power electronics equipment's cold plate, raising the coolant temperature. The high-temperature coolant then enters the battery's cold plate to heat the battery.

[0117] Figure 13 A schematic diagram of another third-mode system is provided. In this mode, the compression refrigeration circuit is not operational. Node 5 of the 10-way valve connects to node 10, and node 6 connects to node 9. Water pump 2, heat exchanger 1, and heat exchanger 2 are shielded from the system. The battery is connected to the power electronics equipment via a shunt device, forming a seventh liquid-cooled circuit. Water pump 1 provides the driving force for the circuit. The heat from the power electronics equipment is transferred to the coolant through the power electronics equipment's cold plate, raising the coolant temperature. The high-temperature coolant then enters the battery's cold plate to heat the battery.

[0118] In some embodiments, an electric heater is provided in the seventh liquid cooling circuit, and the controller is further configured to use the electric heater to heat the battery and the power electronic equipment.

[0119] Figure 14 A schematic diagram of another third-mode system is provided. In this mode, the compression refrigeration circuit is not operational. Node 5 of the 8-way valve connects to node 8, and node 4 connects to node 9. Water pump 2 and the heat exchanger are shielded from the system. The battery, electric heater, shunt device, and power electronic equipment are connected to form a seventh liquid-cooled circuit. In this embodiment, the electric heater provides heat to the battery and power electronic equipment, enabling them to reach their startup temperature.

[0120] In some embodiments, when the operating mode is the third mode, the controller controls the corresponding path of the shunt device to be turned on, so that the electric heater, the battery and the shunt device are connected to form an eighth liquid cooling circuit, so as to use the electric heater to heat the battery.

[0121] Figure 15 Another schematic diagram of the third mode system is given. In the third mode, the compression refrigeration circuit does not work. The passage node 8 in the 10-way valve is connected to the passage node 9. The battery, electric heater, water pump and flow divider are connected to form the eighth liquid cooling circuit. The electric heater can heat the battery.

[0122] The above embodiments can simultaneously dissipate heat for both the battery and the power electronic equipment, and the power electronic equipment does not require compression refrigeration for cooling. This integrates multiple operating modes, resulting in optimal overall energy efficiency. Furthermore, the modular design, breaking down the system into smaller, manageable parts, increases the energy density of the energy storage system and improves its space utilization.

[0123] Based on the above-described embodiments of the energy storage thermal management system, another embodiment of the present invention provides an energy storage thermal management method applied to the controller in the above-described energy storage thermal management system. The flowchart of the energy storage thermal management method is shown below. Figure 16 As shown, it specifically includes:

[0124] S201: When the energy storage thermal management system is detected to meet the preset working mode switching conditions, the current working mode of the energy storage thermal management system is determined; the working mode is one of the first working mode, the second working mode, and the third working mode;

[0125] S202: Control the corresponding path of the shunt device to be turned on according to the working mode of the energy storage thermal management system, so that when the working mode is the first mode, the battery uses compression cooling to exchange heat and the power electronic equipment uses liquid cooling to exchange heat; when the working mode is the second mode, the battery and the power electronic equipment respectively use liquid cooling to exchange heat; when the working mode is the third mode, the battery and the power electronic equipment exchange heat and / or the battery and the electric heater exchange heat.

[0126] In one embodiment of the present invention, based on the above implementation process, optionally, the process of detecting that the energy storage thermal management system meets the preset working mode switching conditions includes:

[0127] Obtain the current ambient temperature and determine the previous operating mode of the energy storage thermal management system;

[0128] If the current ambient temperature is not within the temperature range corresponding to the previous working mode, and the minimum temperature difference between the current ambient temperature and the temperature range is greater than the preset hysteresis threshold, then the energy storage thermal management system is determined to meet the preset working mode switching conditions.

[0129] In this embodiment, it can be first determined whether the current operating time of the energy storage thermal management system is the initial time. If it is the initial time, it can be determined that the energy storage thermal management system meets the operating mode switching conditions. If it is not the initial time, the operating mode of the energy storage thermal management system at the previous time can be determined. Then, if the current ambient temperature is not within the temperature range corresponding to the operating mode at the previous time, and the minimum temperature difference between the current ambient temperature and the temperature range is greater than a preset hysteresis threshold, it can be determined that the energy storage thermal management system meets the preset operating mode switching conditions. By setting a hysteresis threshold, frequent switching of operating modes can be avoided.

[0130] In one embodiment of the present invention, based on the above implementation process, optionally, determining the current operating mode of the energy storage thermal management system includes:

[0131] Get the current ambient temperature;

[0132] Determine the target temperature range within which the current ambient temperature falls;

[0133] The operating mode corresponding to the target temperature range is determined as the current operating mode of the energy storage thermal management system.

[0134] In this embodiment, different operating modes correspond to different temperature ranges. For example, the first mode corresponds to the first temperature range, the second mode corresponds to the second temperature range, and the third mode corresponds to the third temperature range. Any temperature value in the first temperature range is greater than any temperature value in the second temperature range, and any temperature value in the second temperature range is greater than any temperature value in the third temperature range.

[0135] The specific steps in this embodiment are explained in the corresponding descriptions in the above embodiments, and will not be repeated here.

[0136] In the above embodiments, the energy storage thermal management system includes a controller, a battery, power electronic devices, and a valve group. The valve group includes at least one solenoid valve with a preset path. The controller controls the corresponding path of the corresponding solenoid valve in the valve group to be open according to the operating mode of the energy storage thermal management system. In a first mode, the battery uses compression cooling and the power electronic devices use liquid cooling heat exchange; in a second mode, both the battery and the power electronic devices use liquid cooling heat exchange; and in a third mode, the heat from the power electronic devices is used to heat the battery. In other words, this invention achieves heat dissipation for the battery and power electronic devices in three modes (high, medium, and low), and selects different heat dissipation methods according to different operating modes, meeting the heat dissipation requirements of the battery and power electronic devices and solving the problem of simultaneously meeting the heat dissipation requirements of both.

[0137] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage thermal management system, characterized in that, This includes the controller, the coolant passage for the battery, the coolant passage for the power electronic equipment, and the shunt device; The controller is used to determine the operating mode of the energy storage thermal management system, which is any one of a preset first mode, second mode, and third mode; according to the operating mode of the energy storage thermal management system, it controls the corresponding path of the shunt device to be turned on, so that when the operating mode is the first mode, the battery uses compression cooling for heat exchange and the power electronic equipment uses liquid cooling for heat exchange; when the operating mode is the second mode, the battery and the power electronic equipment respectively use liquid cooling for heat exchange; when the operating mode is the third mode, the battery and the power electronic equipment exchange heat, and / or the battery and the electric heater exchange heat. In this system, the compression refrigeration circuit in the energy storage thermal management system shares a liquid-cooled condenser with the liquid-cooled circuit in which the power electronic equipment is located, and the energy storage thermal management system exchanges heat through fluid. The energy storage thermal management system includes at least one set of heat exchangers, and the controller is used for: The corresponding path of the shunt device is controlled to be turned on, so that the battery, the shunt device and the evaporator in the compression refrigeration circuit are connected to form a first liquid cooling circuit, so that the battery can dissipate heat by compression refrigeration; the power electronic equipment, the at least one set of heat exchangers, the shunt device and the liquid cooling condenser are connected to form a second liquid cooling circuit, so that the power electronic equipment can dissipate heat by liquid cooling heat exchange.

2. The energy storage thermal management system according to claim 1, characterized in that, The heat dissipation circuit of the energy storage thermal management system includes a compression refrigeration circuit and a liquid cooling circuit.

3. The energy storage thermal management system according to claim 1, characterized in that, When the operating mode is the first mode, the condenser used in the compression refrigeration method is a liquid-cooled condenser, and the liquid-cooled condenser and the power electronic equipment are in the same liquid-cooling circuit.

4. The energy storage thermal management system according to claim 3, characterized in that, The liquid-cooled condenser and the power electronic equipment are connected in series in the liquid-cooling circuit.

5. The energy storage thermal management system according to claim 1, characterized in that, The diversion device in the energy storage thermal management system includes valve assemblies with multiple preset passages; the controller is used to control the corresponding passages in the valve assemblies with multiple preset passages to be open, so that the power electronic device, the diversion device, the liquid-cooled condenser and the at least one set of heat exchangers are connected to form the second liquid-cooled circuit; so that the battery, the diversion device and the evaporator in the compression refrigeration circuit are connected to form the first liquid-cooled circuit.

6. The energy storage thermal management system according to claim 3, characterized in that, The liquid-cooled condenser and the power electronic equipment are connected in parallel in the liquid-cooling circuit.

7. The energy storage thermal management system according to claim 6, characterized in that, If the energy storage thermal management system includes at least one set of heat exchangers, and the diversion device includes valve assemblies with multiple preset passages, then At least one valve assembly with a preset passage in the diversion device is used to divert the low-temperature coolant output from the at least one set of heat exchangers and allow it to flow through the coolant passages of the liquid-cooled condenser and the power electronic equipment, respectively.

8. The energy storage thermal management system according to claim 1, characterized in that, When the operating mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on, forming a third liquid cooling circuit including the battery and a fourth liquid cooling circuit including the power electronic device; the third liquid cooling circuit and the fourth liquid cooling circuit are independent of each other.

9. The energy storage thermal management system according to claim 8, characterized in that, The energy storage thermal management system includes two sets of heat exchangers, one set of which is located in the third liquid cooling circuit and the other set of which is located in the fourth liquid cooling circuit.

10. The energy storage thermal management system according to claim 1, characterized in that, The energy storage thermal management system includes at least one set of heat exchangers; When the operating mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on to form a fifth liquid cooling circuit; the battery and the power electronic device are connected in series in the fifth liquid cooling circuit and share the heat exchanger for heat dissipation.

11. The energy storage thermal management system according to claim 1, characterized in that, The energy storage thermal management system includes at least one set of heat exchangers; When the operating mode is the second mode, the controller controls the corresponding path of the shunt device to be turned on, forming a sixth liquid cooling circuit; the battery and the power electronic equipment are connected in parallel in the sixth liquid cooling circuit and share the heat exchanger for heat dissipation.

12. The energy storage thermal management system according to claim 1, characterized in that, When the operating mode is the third mode, the battery is placed on the battery cold plate, the power electronic device is placed on the power electronic device cold plate, and the controller controls the corresponding path of the shunt device to be turned on, so that the battery cold plate, the power electronic device cold plate and the shunt device are connected to form a seventh liquid cooling circuit, so as to use the heat of the power electronic device to heat the battery.

13. The energy storage thermal management system according to claim 12, characterized in that, The electric heater is disposed in the seventh liquid cooling circuit, and the controller is also used to heat the battery and the power electronic equipment using the electric heater.

14. The energy storage thermal management system according to claim 1, characterized in that, When the operating mode is the third mode, the corresponding path of the shunt device is controlled to be turned on, so that the electric heater, the battery and the shunt device are connected to form an eighth liquid cooling circuit, so as to use the electric heater to heat the battery.

15. A method for managing thermal energy storage, characterized in that, The controller applied in the energy storage thermal management system as described in any one of claims 1-13, the energy storage thermal management method comprising: If the energy storage thermal management system is found to meet the preset working mode switching conditions, the current working mode of the energy storage thermal management system is determined; the working mode is one of the first working mode, the second working mode, and the third working mode. The corresponding pathway of the shunt device is controlled to be activated according to the working mode of the energy storage thermal management system, so that when the working mode is the first mode, the battery uses compression cooling for heat exchange and the power electronic equipment uses liquid cooling for heat exchange; when the working mode is the second mode, the battery and the power electronic equipment respectively use liquid cooling for heat exchange; when the working mode is the third mode, the battery and the power electronic equipment exchange heat, and / or the battery and the electric heater exchange heat.

16. The energy storage thermal management method according to claim 15, characterized in that, The process of detecting that the energy storage thermal management system meets the preset operating mode switching conditions includes: Obtain the current ambient temperature and determine the previous operating mode of the energy storage thermal management system; If the current ambient temperature is not within the temperature range corresponding to the previous working mode, and the minimum temperature difference between the current ambient temperature and the temperature range is greater than the preset hysteresis threshold, then the energy storage thermal management system is determined to meet the preset working mode switching conditions.

17. The energy storage thermal management method according to any one of claims 15-16, characterized in that, Determining the current operating mode of the energy storage thermal management system includes: Get the current ambient temperature; Determine the target temperature range within which the current ambient temperature falls; The operating mode corresponding to the target temperature range is determined as the current operating mode of the energy storage thermal management system.

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