Energy storage thermal management system and method

Abstract

The present invention provides an energy storage thermal management system and method, which includes a controller, a battery, power electronics, and a shunt device. The controller determines an operating mode of the energy storage management system, which is one of a first mode, a second mode, and a third mode. The controller controls the corresponding passages of the shunt device to be open based on the operating mode of the energy storage thermal management system. In the first mode, the battery exchanges heat using a compression refrigeration method, and the power electronics exchanges heat using a liquid-cooling method. In the second mode, the battery and the power electronics exchange heat using a liquid-cooling method, respectively. In the third mode, the power electronics and / or an electric heater exchange heat with the battery. That is, the present invention allows different heat exchange methods to be selected for the battery and the power electronics according to different operating modes, thereby meeting the heat dissipation needs of the battery and the power electronics.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on February 22, 2023, bearing application number 202310167244.8 and entitled "Energy storage thermal management system and method," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of thermal management, and more particularly to energy storage thermal management systems and methods. [Background technology]

[0003] Currently, the container or battery cabinet of an energy storage system generally consists of a single energy storage component, namely, a battery. However, with the development of the energy storage industry, more and more energy storage systems are being developed into fully prefabricated systems, in which power electronics equipment such as a PCS (Power Conversion System) is also housed in the container or battery cabinet.

[0004] If a battery and power electronics equipment such as a PCS are housed in the same container or battery cabinet, the heat dissipation needs of the battery and the power electronics equipment are different, and therefore, simultaneously meeting the heat dissipation needs of the battery and the power electronics equipment is a technical problem that those skilled in the art must solve. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, the present invention provides an energy storage thermal management system and method that solves the problem of simultaneously meeting the heat dissipation needs of batteries and power electronic devices. [Means for solving the problem]

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: An energy storage thermal management system, comprising: a controller, a battery, power electronics, and a shunt device; The controller determines the operating mode of the energy storage management system, which is one of a first mode, a second mode, and a third mode. Based on the operating mode of the energy storage thermal management system, the controller controls the corresponding passage of the shunt device to be conductive, so that when the operating mode is the first mode, the battery performs heat exchange using a compression refrigeration method and the power electronic equipment performs heat exchange using a liquid-cooled heat exchange method; when the operating mode is the second mode, the battery and the power electronic equipment each perform heat exchange using a liquid-cooled heat exchange method; and when the operating mode is the third mode, the battery and the power electronic equipment perform heat exchange, and / or the battery and an electric heater perform heat exchange.

[0007] In the above energy storage thermal management system, preferably, the compression refrigeration circuit in the energy storage thermal management system and the liquid cooling circuit in which the power electronics equipment is located share a liquid-cooled condenser, and the energy storage thermal management system performs heat exchange using a fluid.

[0008] In the above energy storage thermal management system, the heat dissipation circuit of the energy storage thermal management system preferably includes a compression refrigeration circuit and a liquid cooling circuit.

[0009] In the above energy storage thermal management system, preferably, 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 electronics device are in the same liquid-cooled circuit.

[0010] In the above energy storage thermal management system, the liquid-cooled condenser and the power electronics device are preferably connected in series in the liquid-cooled circuit.

[0011] In the above energy storage thermal management system, preferably, the energy storage thermal management system includes at least one set of heat exchangers, and the controller By controlling the corresponding passages of the shunt device to be conductive, 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 first liquid-cooled circuit, and the power electronic equipment dissipates heat using a liquid-cooled heat exchange method; the battery, the shunt device and the evaporator in the compression refrigeration circuit are connected to form a second liquid-cooled circuit, and the battery dissipates heat using a compression refrigeration method.

[0012] In the above-mentioned energy storage thermal management system, preferably, the flow dividing device in the energy storage thermal management system includes a valve unit with a plurality of predetermined passages, and the controller controls corresponding passages in the valve units with the plurality of predetermined passages to be conductive, so that the power electronics equipment, the flow dividing device, the liquid-cooled condenser, and the at least one set of heat exchangers are connected to form the first liquid-cooled circuit, and the battery, the flow dividing device, and the evaporator in the compression refrigeration circuit are connected to form the second liquid-cooled circuit.

[0013] In the above energy storage thermal management system, preferably, the liquid-cooled condenser and the power electronics device are connected in parallel in the liquid-cooled circuit, When the energy storage thermal management system includes at least one set of heat exchangers and the flow dividing device includes a plurality of valve units for predetermined passages, the low-temperature coolant output from the at least one set of heat exchangers is diverted by a specific valve unit of the flow dividing device to flow through the fluid passages of the liquid-cooled condenser and the power electronics equipment, respectively.

[0014] In the above-mentioned energy storage thermal management system, preferably, when the operating mode is the second mode, the controller controls the corresponding passages of the shunt device to be conductive to form a third liquid cooling circuit including the battery and a fourth liquid cooling circuit including the power electronics equipment, respectively, and the third liquid cooling circuit and the fourth liquid cooling circuit are independent of each other.

[0015] In the above energy storage thermal management system, preferably, the energy storage thermal management system includes two sets of heat exchangers, one set of the heat exchangers being located in the third liquid cooling circuit, and the other set of the heat exchangers being located in the fourth liquid cooling circuit.

[0016] In the above energy storage thermal management system, preferably, 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 passage of the flow dividing device to be conductive to form a fifth liquid cooling circuit, and the battery and the power electronics device are connected in series in the fifth liquid cooling circuit and share the heat exchanger to dissipate heat.

[0017] In the above energy storage thermal management system, preferably, 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 passage of the flow dividing device to be conductive to form a sixth liquid cooling circuit, and the battery and the power electronics device are connected in parallel in the sixth liquid cooling circuit and share the heat exchanger to dissipate heat.

[0018] In the above-mentioned energy storage thermal management system, preferably, when the operating mode is the third mode, the battery is installed on a battery cold panel, and the power electronic equipment is installed on a power electronic equipment cold panel, and the controller controls the corresponding passages of the shunt device to be conductive, so that the battery cold panel, the power electronic equipment cold panel and the shunt device are connected to form a seventh liquid cooling circuit, and the battery is heated by the heat of the power electronic equipment.

[0019] In the above energy storage thermal management system, preferably, the electric heater is provided in the seventh liquid cooling circuit, and the controller further heats the battery and the power electronics device using the electric heater.

[0020] In the above energy storage thermal management system, preferably, when the operating mode is the third mode, the corresponding passage of the shunt device is controlled to be conductive, so that the electric heater, the battery and the shunt device are connected to form an eighth liquid cooling circuit, and the battery is heated using the electric heater.

[0021] An energy storage thermal management method, which is applied to a controller in the above-mentioned energy storage thermal management system, comprising: When the energy storage thermal management system detects that a predetermined operation mode switching condition is satisfied, determining a current operation mode of the energy storage thermal management system, wherein the operation mode is one of a first operation mode, a second operation mode, and a third operation mode; The energy storage thermal management system includes a step of controlling the corresponding passage of the shunt device to be conductive based on the current operating mode, so that when the operating mode is the first mode, the battery performs heat exchange using a compression refrigeration method and the power electronic equipment performs heat exchange using a liquid-cooled heat exchange method, when the operating mode is the second mode, the battery and the power electronic equipment each perform heat exchange using a liquid-cooled heat exchange method, and when the operating mode is the third mode, the battery and the power electronic equipment perform heat exchange and / or the battery and an electric heater perform heat exchange.

[0022] In the above energy storage thermal management method, preferably, the step of detecting that the energy storage thermal management system satisfies a predetermined operation mode switching condition includes: Obtaining a current ambient temperature to determine an operation mode of the energy storage thermal management system at a previous time; The method includes determining that the energy storage thermal management system satisfies a predetermined operating mode switching condition when the current ambient temperature does not fall within a temperature range corresponding to the operating mode at the immediately preceding time and the minimum temperature difference between the current ambient temperature and the temperature range is greater than a predetermined hysteresis threshold.

[0023] In the above energy storage thermal management method, preferably, the step of determining a current operation mode of the energy storage thermal management system includes: obtaining a current ambient temperature; determining a target temperature range in which the current ambient temperature is located; determining an operating mode corresponding to the target temperature range as a current operating mode of the energy storage thermal management system. [Effects of the Invention]

[0024] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an energy storage thermal management system and method, which includes a controller, a battery, power electronics, and a shunt device. The controller determines an operating mode of the energy storage management system, which is one of a first mode, a second mode, and a third mode. The controller controls the corresponding passages of the shunt device to be open according to the operating mode of the energy storage thermal management system. In the first mode, the battery exchanges heat using a compression refrigeration method, and the power electronics exchanges heat using a liquid-cooling method. In the second mode, the battery and the power electronics exchange heat using a liquid-cooling method, respectively. In the third mode, the power electronics and / or an electric heater exchange heat with the battery. That is, the present invention realizes heat dissipation from the battery and the power electronics in different modes, and selects different heat dissipation methods according to different operating modes to meet the heat dissipation needs of the battery and the power electronics, solving the problem of simultaneously meeting the heat dissipation needs of the battery and the power electronics.

[0025] In order to more clearly explain the technical solutions of the embodiments of the present invention or the prior art, the following briefly introduces the drawings necessary for the description of the embodiments or the prior art. The drawings described below are only embodiments of the present invention, and those skilled in the art can obtain other drawings based on the provided drawings without exerting any effort that amounts to inventive step. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a structural schematic diagram of an energy storage thermal management system provided by an embodiment of the present invention; [Figure 2] FIG. 2 is a structural schematic diagram of another energy storage thermal management system provided by an embodiment of the present invention. [Figure 3] FIG. 2 is a structural schematic diagram of yet another energy storage thermal management system provided by an embodiment of the present invention. [Figure 4] FIG. 2 is a structural schematic diagram of another energy storage thermal management system provided by an embodiment of the present invention. [Figure 5] FIG. 10 is a structural schematic diagram of the fifth energy storage thermal management system provided by an embodiment of the present invention. [Figure 6] FIG. 10 is a structural schematic diagram of the sixth energy storage thermal management system provided by an embodiment of the present invention. [Figure 7] FIG. 10 is a structural schematic diagram of the seventh energy storage thermal management system provided by an embodiment of the present invention. [Figure 8] FIG. 10 is a structural schematic diagram of the eighth energy storage thermal management system provided by an embodiment of the present invention. [Figure 9] FIG. 10 is a structural schematic diagram of the ninth energy storage thermal management system provided by an embodiment of the present invention. [Figure 10] FIG. 16 is a structural schematic diagram of the tenth energy storage thermal management system provided by an embodiment of the present invention. [Figure 11] FIG. 14 is a structural schematic diagram of the eleventh energy storage thermal management system provided by an embodiment of the present invention. [Figure 12] FIG. 12 is a structural schematic diagram of the energy storage thermal management system according to an embodiment of the present invention. [Figure 13] FIG. 13 is a structural schematic diagram of the energy storage thermal management system according to the embodiment of the present invention. [Figure 14] FIG. 14 is a structural schematic diagram of the fourteenth energy storage thermal management system provided by an embodiment of the present invention. [Figure 15] FIG. 15 is a structural schematic diagram of the energy storage thermal management system according to the embodiment of the present invention. [Figure 16] 1 is a method flowchart of an energy storage thermal management method provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The following clearly and completely describes the technical solutions of the embodiments of the present invention, combined with the drawings of the embodiments of the present invention, and the described embodiments are not all embodiments but only some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without any inventive effort are within the scope of protection of the present invention.

[0028] Currently, an energy storage system container or battery cabinet typically consists of a single energy storage component, the battery, which typically uses a liquid-cooled thermal management system to dissipate heat. The liquid-cooled thermal management system consists of a liquid cooling means (including a compressor, condenser, throttle device, plate heat exchanger, water pump, water tank, and associated piping controller), a piping system, and a cold panel. The liquid cooling means is the core of the liquid cooling system and provides power for the coolant circulation. The heat carried by the coolant is then dissipated into the air via the liquid cooling means. The liquid-cooled thermal management system consists of two circuits: the coolant circulation circuit and the refrigerant circulation circuit. The low-temperature coolant absorbs the battery's heat from the battery's cold panel, increasing its temperature, and then transfers heat to the refrigerant via the plate heat exchanger, becoming a low-temperature coolant. The liquid refrigerant absorbs the heat of the cooling liquid in the plate heat exchanger and vaporizes into gas, which is then compressed into high-temperature, high-pressure gas by the compressor. In the condenser, the high-temperature, high-pressure gas refrigerant releases heat into the air and liquefies into high-pressure liquid, which then passes through a throttle device to become low-temperature, low-pressure liquid refrigerant, which then enters the plate heat exchanger and causes the cooling liquid to dissipate heat.

[0029] The heat dissipation method using a liquid cooling thermal management system has an excellent heat dissipation effect for a single target, i.e., a battery. However, with the development of the energy storage industry, more and more energy storage systems are being developed into fully prefabricated systems, for example, power electronics equipment such as PCS (Power Conversion System) is also housed in a container or battery cabinet.

[0030] If the battery and power electronics equipment such as the PCS are housed in the same container or battery cabinet, the heat dissipation needs of the battery and the power electronics equipment are different. For example, the coolant temperature requirements for heat dissipation of the battery and the power electronics equipment are different. A battery generally requires a coolant of about 18°C, while a power electronics equipment generally requires a coolant of about 50°C. If a liquid cooling thermal management system is used to simultaneously dissipate heat from the battery and the power electronics equipment, the coolant temperature of the power electronics equipment is about 20°C, resulting in low energy efficiency and high costs for the system.

[0031] In addition, since the liquid cooling means has high requirements for the heat dissipation capacity of the condenser, the size of the condenser is generally large, and the size of the liquid cooling means is also large. In order to pass high-pressure refrigerant through the condenser and ensure the reliability of the system, a welding form is generally adopted for the pipes, so the liquid cooling means cannot be installed separately, and the space utilization rate of the energy storage system cannot be maximized.

[0032] As described above, how to simultaneously satisfy the heat dissipation needs of the battery and the power electronics device is a technical problem that those skilled in the art are trying to solve.

[0033] Therefore, the present invention provides an energy storage thermal management system and method, the energy storage thermal management system including a controller, a battery, power electronic equipment, and a shunt device, the controller determines the operating mode of the energy storage management system, the operating mode being one of a first mode, a second mode, and a third mode, and controls the corresponding passage of the shunt device to be conductive based on the operating mode of the energy storage thermal management system, so that when the operating mode is the first mode, the battery performs heat exchange using a compression refrigeration method, and the power electronic equipment performs heat exchange using a liquid-cooled heat exchange method, when the operating mode is the second mode, the battery and the power electronic equipment each perform heat exchange using a liquid-cooled heat exchange method, and when the operating mode is the third mode, the battery and the power electronic equipment perform heat exchange, and / or the battery and an electric heater perform heat exchange. That is, the present invention realizes heat dissipation of the battery and the power electronic equipment in different modes, selects different heat dissipation methods according to different operating modes, meets the heat dissipation needs of the battery and the power electronic equipment, and solves the problem of simultaneously meeting the heat dissipation needs of the battery and the power electronic equipment.

[0034] In this embodiment, the energy storage thermal management system can simultaneously provide corresponding heat exchange modes for the battery and the power electronics equipment in different modes. The system has multiple operating modes, including, for example, a first mode, a second mode, and a third mode, and the different modes can be switched according to the ambient temperature. The switching between different function modes is realized by a shunt device.

[0035] Based on the above, an embodiment of the present invention provides an energy storage thermal management system. Referring to FIG. 1, the energy storage thermal management system includes a controller 11, a battery 12, a power electronics device 13, and a shunt device 14. In this embodiment, the shunt device 14 includes at least one electromagnetic valve, such as a multi-way valve, for a predetermined passage.

[0036] The controller 11 controls the corresponding passage of the shunt device to be open based on the operating mode of the energy storage thermal management system, so that when the operating mode is the first mode, the battery exchanges heat using a compression refrigeration method and the power electronic equipment exchanges heat using a liquid-cooled heat exchange method; when the operating mode is the second mode, the battery and the power electronic equipment exchange heat using a liquid-cooled heat exchange method, respectively; and 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.

[0037] Preferably, the controller determines the current operating mode of the energy storage thermal management system based on the temperature zone in which the current ambient temperature is located, where the first mode is a high temperature mode, the second mode is a medium temperature mode, and the third mode is a low temperature mode.

[0038] In this embodiment, the power electronic equipment includes one or more of a PCS, a current conversion module DC / DC, a switch box, and the like.

[0039] In this embodiment, in the first mode, the battery 12 dissipates heat using a compression refrigeration method, and the power electronics device 13 dissipates heat using a liquid-cooled heat exchange method. In the second mode, both the battery 12 and the power electronics device 13 dissipate heat using a liquid-cooled heat exchange method. In the third mode, the battery is heated by the heat from the power electronics device 13.

[0040] In this embodiment, heat exchange between the battery and the power electronic equipment is realized in different modes, and different heat exchange methods are selected according to different operating modes to meet the heat dissipation needs of the battery and the power electronic equipment, and solve the problem of simultaneously meeting the heat dissipation needs of the battery and the power electronic equipment.

[0041] In one embodiment provided by the present invention, an energy storage thermal management system includes a compression refrigeration circuit and a liquid cooling circuit.

[0042] Preferably, the compression refrigeration circuit includes a compressor, an evaporator, a condenser, and a throttle valve, and the condenser may be a liquid-cooled condenser. The controller controls the conduction of different predetermined passages in the flow dividing device to form different liquid-cooled circuits, and the number of liquid-cooled circuits may be one or more, and each liquid-cooled circuit is formed by at least one of a battery and a power electronic device, and the battery and the power electronic device may be located in the same or different liquid-cooled circuits, and each liquid-cooled circuit is provided with at least one water pump for providing power to the coolant in the liquid-cooled circuit.

[0043] In this embodiment, the battery and the power electronic equipment are provided with coolant passages, the battery coolant passage is the battery cold panel, and the power electronic equipment coolant passage is the power electronic equipment cold panel. The flow dividing device includes a multi-way valve or a plurality of valve units, the multi-way valve includes a plurality of passage nodes, one end of the battery coolant passage is connected to the first passage node of the flow dividing device and the other end is connected to the second passage node of the flow dividing device via the first water pump and the evaporator in that order, one end of the power electronic equipment coolant passage is connected to the third passage node of the flow dividing device and the other end is connected to the fourth passage node of the flow dividing device, and one end of the liquid cooling passage of the condenser of the compression refrigeration circuit is connected to the fifth passage node of the flow dividing device and the other end is connected to the sixth passage node of the flow dividing device.

[0044] In this embodiment, the controller controls the shunt device to open a predetermined passage corresponding to the operating mode, for example, if the shunt device is a multi-way valve, the controller controls the shunt device to connect corresponding passage nodes to open the predetermined passage, and forms a liquid cooling circuit corresponding to the operating mode to meet the heat exchange needs of the battery and the power electronics device in different modes.

[0045] In some embodiments, the controller controls the flow dividing device to conduct a predetermined path, so that the power electronics device and the liquid-cooled condenser are located in the same liquid-cooled circuit.

[0046] In this embodiment, the compression refrigeration circuit in the energy storage thermal management system and the liquid-cooled circuit in which the power electronic equipment is located share a liquid-cooled condenser, and the energy storage thermal management system performs heat exchange through a fluid, which may be a coolant. The compression refrigeration circuit and the liquid-cooled circuit in which the power electronic equipment is located share a liquid-cooled condenser, which effectively saves hardware costs and hardware arrangement space, improves the heat exchange efficiency of the power electronic equipment, and meets the heat exchange needs of the power electronic equipment in different operating modes.

[0047] In some embodiments, the controller determines a current operating mode of the energy storage thermal management system when the controller detects that the energy storage thermal management system meets a predetermined operating mode switching condition.

[0048] The above embodiment refers to three operation modes, namely, the first mode, the second mode, and the third mode. Hereinafter, the specific heat exchange methods of the battery and the power electronics device in each operation mode will be introduced.

[0049] In this embodiment, the heat dissipation circuit of the energy storage thermal management system is divided into a compression refrigeration circuit and a liquid cooling circuit, so that different heat exchange methods are selected for the battery and the power electronics equipment to perform heat exchange. However, in actual applications, in some operating modes, some circuits, such as the compression refrigeration circuit, may or may not operate, and this is determined according to the actual situation.

[0050] 1. First mode In another embodiment of the present invention, the condenser used in the compression refrigeration system is a liquid-cooled condenser, and the liquid-cooled condenser and the power electronics device are in the same liquid-cooled circuit.

[0051] According to different practical scenarios, the liquid-cooled condenser and the power electronic equipment can be connected in series or in parallel. In this embodiment, the liquid-cooled condenser and the power electronic equipment are first connected in series.

[0052] 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 passages of the shunt device to be conductive, so that the power electronics device, the at least one set of heat exchangers, the shunt device, and the liquid-cooled condenser are connected to form a first liquid-cooled circuit, and the power electronics device dissipates heat in a liquid-cooled heat exchange manner; the battery, the shunt device, and the evaporator in the compression refrigeration circuit are connected to form a second liquid-cooled circuit, and the battery dissipates heat in a compression refrigeration manner.

[0053] Preferably, in the first mode, the controller controls the flow dividing device to open a passage corresponding to the first mode, thereby forming a first liquid cooling circuit and a second liquid cooling circuit, the first liquid cooling circuit including a battery, a first water pump, and an evaporator in the compression refrigeration circuit, and the second liquid cooling circuit including a power electronics device, a second water pump, at least one set of heat exchangers, and a liquid-cooled condenser in the compression refrigeration circuit, and the power electronics device and the liquid-cooled condenser are connected in series or in parallel in the second liquid cooling circuit.

[0054] In this embodiment, the controller activates 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, so that the battery performs heat exchange using a compression refrigeration method and the power electronics equipment performs heat exchange using a liquid-cooled heat exchange method.

[0055] Specifically, referring to FIG. 2, the energy storage thermal management system includes two sets of heat exchangers, two water pumps, one flow dividing device, a battery, a power electronics device, and one set of compression refrigeration circuit, and the flow dividing device is a ten-way valve (which may be a valve group consisting of multiple valves).

[0056] The energy storage thermal management system includes three circuits: a first liquid cooling circuit, a compression refrigeration circuit, and a second liquid cooling circuit. Figure 2 shows the system principle in mode 1. The shunt device includes a ten-way valve, and the controller controls the ten-way valve so that passage node 1 communicates with passage node 2, passage node 3 communicates with passage node 4, passage node 5 communicates with passage node 6, passage node 8 communicates with passage node 9, and passage node 7 communicates with passage node 10. The first liquid cooling circuit is formed by connecting a water pump 1, an evaporator, a battery, pipelines, and the shunt device. The low-temperature coolant dissipates heat from the battery through the battery cold panel, its temperature increases, and then it flows through the evaporator, transferring heat to the refrigerant and decreasing its temperature. The compression refrigeration circuit is composed of a compressor, an evaporator, a liquid-cooled condenser, and a throttle device. The low-temperature liquid refrigerant absorbs heat from the first liquid-cooled circuit in the evaporator and vaporizes into a gas. It is then compressed into a high-temperature, high-pressure gas by the compressor, flows through the liquid-cooled condenser, transfers heat to the second liquid-cooled circuit, and liquefies into a high-temperature, high-pressure liquid. It then passes through the throttle device and becomes a low-temperature, low-pressure liquid. The second liquid-cooled circuit is formed by connecting two sets of heat exchangers (heat exchanger 1 and heat exchanger 2), a liquid-cooled condenser, a water pump 2, power electronics equipment, pipes, and a dividing device. The low-temperature coolant flows through the liquid-cooled condenser to dissipate heat, increasing its temperature. It then flows through the cold panel of the power electronics to dissipate heat from the power electronics equipment, and finally flows through two sets of heat exchangers in sequence to reject heat into the air and decrease its temperature.

[0057] Referring to FIG. 3, a set of heat exchangers is provided in FIG. 3, and the energy storage thermal management system includes a set of heat exchangers, two water pumps, an eight-way valve as a flow dividing device (the flow dividing device may be a valve group composed of multiple valves), a battery, power electronics equipment, and a set of compression refrigeration circuits.

[0058] The energy storage thermal management system includes three circuits: a first liquid cooling circuit, a compression refrigeration circuit, and a second liquid cooling circuit. Figure 3 shows the system principle diagram for the first mode, in which the shunt device includes an eight-way valve, and the controller controls the eight-way valve so that passage node 1 communicates with passage node 6, passage node 2 communicates with passage node 3, passage node 4 communicates with passage node 5, and passage node 7 communicates with passage node 8. The first liquid cooling circuit is formed by connecting the water pump 1, the evaporator, the battery, the pipelines, and the shunt device. The low-temperature coolant dissipates heat from the battery through the cold panel of the battery, its temperature increases, and then it flows through the evaporator, transferring heat to the refrigerant and decreasing its temperature. The compression refrigeration circuit is composed of a compressor, an evaporator, a liquid-cooled condenser, and a throttle device. The low-temperature liquid refrigerant absorbs heat from the first liquid-cooled circuit in the evaporator and vaporizes into gas. It is then compressed into high-temperature, high-pressure gas by the compressor, flows through the liquid-cooled condenser, transfers heat to the second liquid-cooled circuit, and is liquefied into high-temperature, high-pressure liquid. It then passes through the throttle device and becomes low-temperature, low-pressure liquid. The second liquid-cooled circuit is formed by connecting a set of heat exchangers, a liquid-cooled condenser, a water pump 2, power electronic equipment, pipes, and a dividing device. The low-temperature coolant flows through the liquid-cooled condenser to dissipate heat, increasing its temperature. It then flows through the cold panel of the power electronic equipment to dissipate heat from the power electronic equipment, and finally flows through a set of heat exchangers to reject heat into the air and reduce its temperature.

[0059] In another embodiment of the present invention, the energy storage thermal management system further includes: a flow dividing device in the energy storage thermal management system including a plurality of predetermined passage solenoid valves, and the controller controls corresponding passages in the plurality of predetermined passage valve units to be conductive, thereby connecting the power electronics device, the flow dividing device, the liquid-cooled condenser, and the at least one heat exchanger to form the first liquid-cooled circuit, and connecting the battery, the flow dividing device, and the evaporator in the compression refrigeration circuit to form the second liquid-cooled circuit. In this embodiment, the first liquid-cooled circuit and the compression refrigeration circuit use the same evaporator, and the power electronics device is in the second liquid-cooled circuit and uses a heat exchanger to dissipate heat.

[0060] Referring to FIG. 4, the entire energy storage thermal management system includes a heat exchanger, two water pumps, a ten-way valve (or a valve group consisting of multiple valves), two three-way pipes or three-way valves, a battery, power electronics, and a compression refrigeration circuit. The entire energy storage thermal management system has three circuits: a compression refrigeration circuit, a first liquid cooling circuit, and a second liquid cooling circuit. FIG. 4 shows the system principle diagram for the first mode. The flow dividing device includes a ten-way valve, and the controller controls the ten-way valve so that passage node 1 communicates with passage node 7, passage node 3 communicates with passage node 4, passage node 5 communicates with passage node 6, and passage node 8 communicates with passage node 9. The first liquid cooling circuit is formed by connecting water pump 1, an evaporator, a battery, pipes, and the flow dividing device. The low-temperature coolant dissipates heat from the battery through the cold panel of the battery, and its temperature rises. It then flows through the evaporator, transferring heat to the refrigerant and decreasing its temperature. The compression refrigeration circuit is composed of a compressor, an evaporator, a liquid-cooled condenser, and a throttle device. The low-temperature liquid refrigerant absorbs heat from the first liquid-cooled circuit in the evaporator and vaporizes into gas. It is then compressed into high-temperature, high-pressure gas by the compressor, flows through the liquid-cooled condenser to transfer heat to the power electronics, and is liquefied into high-temperature, high-pressure liquid. It then passes through the throttle device to become low-temperature, low-pressure liquid. The second liquid-cooled circuit is formed by connecting a set of heat exchangers, a liquid-cooled condenser, a water pump 2, power electronics, pipes, and a shunt device. The low-temperature coolant flows through the liquid-cooled condenser to dissipate heat, increasing its temperature. It then flows through the cold panel of the power electronics to dissipate heat from the power electronics, and finally flows through a set of heat exchangers to reject heat into the air and reduce its temperature.

[0061] In another embodiment of the present invention, when the liquid-cooled condenser and the power electronic equipment are connected in parallel, the energy storage thermal management system includes at least one set of heat exchangers, and the valve unit includes valve units with multiple predetermined passages, the low-temperature cooling liquid output from the at least one set of heat exchangers is diverted by a specific valve unit in the diverting device to flow through the fluid passages of the liquid-cooled condenser and the power electronic equipment, respectively, and the fluid passage of the power electronic equipment may be a cold panel of the power electronic equipment.

[0062] Specifically, referring to Figure 5, the entire energy storage thermal management system includes two heat exchangers, two water pumps, one ten-way valve (which may be a valve group consisting of multiple valves), two three-way pipes or three-way valves, a battery, power electronics equipment, and one compression refrigeration circuit. The entire energy storage thermal management system has three circuits: a first liquid cooling circuit, a compression refrigeration circuit, and a second liquid cooling circuit. Figure 5 shows a system principle diagram of the first mode, in which the flow dividing device includes a ten-way valve, and the controller controls the ten-way valve so that passage node 9 communicates with passage node 10, passage node 1 communicates with passage node 8, passage node 2 communicates with passage node 3, passage node 4 communicates with passage node 5, and passage node 6 communicates with passage node 7. The first liquid cooling circuit is formed by connecting a water pump 1, an evaporator, a battery, piping, and a flow-dividing device. The low-temperature coolant dissipates heat from the battery through the battery's cold panel, increasing its temperature. It then flows through the evaporator, transferring heat to the refrigerant and decreasing its temperature. The compression refrigeration circuit is composed of a compressor, an evaporator, a liquid-cooled condenser, and a throttle device. The low-temperature liquid refrigerant absorbs heat from the battery in the evaporator and vaporizes into a gas. It is then compressed into a high-temperature, high-pressure gas by the compressor, flows through the liquid-cooled condenser, transferring heat to the second liquid cooling circuit, where it is liquefied into a high-temperature, high-pressure liquid, and then passes through the throttle device to become a low-temperature, low-pressure liquid. 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, a water pump 2, the power electronics equipment's cold panel, piping, and a flow-dividing device. The low-temperature coolant flowing out of the heat exchanger is split into two paths via a three-way pipe or a three-way valve; one path dissipates heat from the liquid-cooled condenser, and the other path dissipates heat from the power electronics equipment. Then, via a three-way pipe or a three-way valve, the two paths merge into one path, passing through heat exchanger 2 and heat exchanger 1 in that order, dissipating heat into the ambient air and reducing its temperature.

[0063] As can be seen from the above, in the first mode, the battery dissipates heat using a compression refrigeration method, and the power electronics dissipates heat using a liquid-cooled heat exchange method. The condenser in the compression refrigeration circuit is a liquid-cooled condenser, and the liquid-cooled condenser and the power electronics are in the same liquid-cooled circuit, and the condenser in the compression refrigeration circuit dissipates heat using the coolant in the second liquid-cooled circuit. In the first mode, there are two possible connection methods between the liquid-cooled condenser and the power electronics: 1) The liquid-cooled condenser and the power electronic device may be connected in series, and the cooling liquid flows through the liquid-cooled condenser and then through the cold panel of the power electronic device to dissipate heat from the power electronic device. 2) The liquid-cooled condenser and the power electronic equipment may be connected in parallel, and the cooling liquid is divided into two paths through a three-way pipe, one path entering the liquid-cooled condenser and the other path entering the cold panel of the power electronic equipment.

[0064] 2. Second mode In the second mode, the overall architecture of the energy storage thermal management system may be similar to that in the first mode, but the connection method of the shunt device and the operation method of each circuit are different, which will be introduced below.

[0065] 2.1) When the operating mode is the second mode, the controller controls the corresponding passages of the flow dividing device to be conductive to form a third liquid cooling circuit including the battery and a fourth liquid cooling circuit including the power electronics equipment, respectively, and the third liquid cooling circuit and the fourth liquid cooling 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 cooling circuit and the other of which is located in the fourth liquid cooling circuit.

[0066] In this embodiment, the third liquid cooling circuit allows the battery to dissipate heat by liquid-cooling heat exchange, and the fourth liquid cooling circuit allows the power electronics device to dissipate heat by liquid-cooling heat exchange.

[0067] Preferably, the energy storage thermal management system includes at least two sets of heat exchangers, wherein a first heat exchanger in the at least two sets of heat exchangers is located in a third liquid cooling circuit, a second heat exchanger in the at least two sets of heat exchangers is located in a fourth liquid cooling circuit, the first heat exchanger is any heat exchanger in the at least two sets of heat exchangers, and the second heat exchanger is any heat exchanger other than the first heat exchanger.

[0068] The energy storage thermal management system employs the architecture shown in Figure 2. The heat dissipation method in the second mode is specifically shown in Figure 6. Figure 6 shows a system principle diagram for the second mode. In this mode, the shunt includes a ten-way valve. The controller controls the ten-way valve so that passage node 9 communicates with passage node 10, passage node 1 communicates with passage node 8, passage node 2 communicates with passage node 7, passage node 3 communicates with passage node 4, and passage node 5 communicates with passage node 6. The compression refrigeration circuit is inactive, and the battery and power electronics use a liquid-cooled heat exchange method for heat dissipation. The water pump 1, heat exchanger 1, battery, pipelines, and shunt form a third liquid-cooled circuit. The cryogenic coolant enters the battery cold panel to dissipate heat from the battery, increasing its temperature. The cryogenic coolant then enters heat exchanger 1, rejecting heat to the ambient air and lowering its temperature. The water pump 2, heat exchanger 2, power electronic equipment and pipelines constitute the fourth liquid cooling circuit, and the low-temperature coolant enters the cold panel of the power electronic equipment to dissipate heat from the power electronic equipment, increasing the temperature of the low-temperature coolant, which then enters heat exchanger 2 to dissipate heat into the ambient air, thereby decreasing the temperature of the low-temperature coolant.

[0069] The overall architecture of the energy storage thermal management system is shown in Figure 5. The heat dissipation method in the second mode is specifically shown in Figure 7. Figure 7 shows the system principle in the second mode. In this mode, the flow dividing device includes a ten-way valve. The controller controls the ten-way valve so that passage node 1 communicates with passage node 10, passage node 2 communicates with passage node 9, passage node 3 communicates with passage node 8, passage node 4 communicates with passage node 5, and passage node 6 communicates with passage node 7. The compression refrigeration circuit is inactive, and the battery and power electronics use a liquid-cooled heat exchange method for heat dissipation. The water pump 1, battery, heat exchanger 1, and pipelines form a third liquid-cooled circuit. The cryogenic coolant enters the battery cold panel to dissipate heat from the battery, increasing its temperature, and then enters heat exchanger 1 to reject heat into the ambient air, lowering the temperature of the cryogenic coolant. The water pump 2, heat exchanger 1, power electronic equipment, pipelines and flow divider are connected to form a fourth liquid cooling circuit, and the low-temperature coolant enters the cold panel of the power electronic equipment to dissipate heat from the power electronic equipment, increasing its temperature, and then enters the heat exchanger 2 to reject heat into the ambient air, decreasing its temperature.

[0070] 2.2) In the second mode, the controller controls the corresponding passages of the flow dividing device to be open to form a fifth liquid cooling circuit, in which the battery and the power electronics are connected in series and share the same heat exchanger to dissipate heat. In this embodiment, the fifth liquid cooling circuit allows the battery and the power electronics to dissipate heat through a liquid-cooled heat exchanger.

[0071] The overall architecture of the energy storage thermal management system is shown in Figure 3. The heat dissipation method in the second mode is specifically shown in Figure 8. Figure 8 shows a system principle diagram for the second mode. In this mode, the shunt device includes an eight-way valve, and the controller controls the eight-way valve so that passage node 1 communicates with passage node 8, passage node 2 communicates with passage node 3, and passage node 4 communicates with passage node 7. The compression refrigeration circuit is not operating, and the battery and power electronics use a liquid-cooled heat exchange method to dissipate heat. Water pump 2 is shielded by the eight-way valve shield. The battery, power electronics, water pump 1, heat exchanger, and shunt device are connected to form a fifth liquid-cooled circuit, and water pump 1 provides driving force for the circuit. The low-temperature coolant enters the battery cold panel to dissipate heat, increasing its temperature, then enters the power electronics cold panel to dissipate heat, increasing its temperature further. Finally, the high-temperature coolant enters the heat exchanger to reject heat into the ambient air and reduce its temperature.

[0072] 2.3) The energy storage thermal management system includes at least one heat exchanger, and when the operating mode is the second mode, the controller controls the corresponding passages of the flow dividing device to be open to form a sixth liquid cooling circuit, and the battery and the power electronics are connected in parallel in the sixth liquid cooling circuit and share the heat exchanger to dissipate heat. In this embodiment, the sixth liquid cooling circuit allows the battery and the power electronics to dissipate heat in a liquid-cooled heat exchange manner.

[0073] The overall architecture of the energy storage thermal management system is shown in Figure 4. The heat dissipation method in the second mode is specifically shown in Figure 9. Figure 9 shows the system principle in the second mode. In this mode, the shunt device includes a ten-way valve, and the controller controls the ten-way valve so that passage node 1 communicates with passage node 7, passage node 2 communicates with passage node 8, passage node 3 communicates with passage node 4, passage node 5 communicates with passage node 6, and passage node 9 communicates with passage node 10. The compression refrigeration circuit is inactive, and the battery and power electronics use a liquid-cooled heat exchange method to dissipate heat. A sixth liquid-cooled circuit is formed by connecting water pump 1, the battery, water pump 2, the power electronics, multiple three-way pipes or three-way valves, and the shunt device. The low-temperature coolant flows out of the heat exchanger and is split into two paths via a three-way valve. One path flows through the battery cold panel to dissipate heat from the battery, and the other path flows through the power electronics cold panel to dissipate heat. The two paths then merge into one path via a three-way pipe or a three-way valve, enter the heat exchanger, and reject heat to the environment, reducing its temperature.

[0074] As described above, in the second mode, the compression refrigeration system is not operating, and the battery and power electronics equipment use a liquid-cooling heat exchange method to dissipate heat. Specifically, the second mode can be realized in the following ways: 1) The liquid cooling circuit in which the battery is located and the liquid cooling circuit in which the power electronics equipment is located are independent of each other, and each liquid cooling circuit includes at least one set of heat exchangers. 2) The battery and the power electronics equipment share a liquid cooling circuit (fifth liquid cooling circuit), in which the battery and the power electronics equipment are connected in series, and the battery and the power electronics equipment share at least one set of heat exchangers to dissipate heat; 3) The battery and the power electronics equipment share a liquid cooling circuit (sixth liquid cooling circuit), in which the battery and the power electronics equipment are connected in parallel, and the battery and the power electronics equipment share at least one set of heat exchanger heat dissipation.

[0075] 3. Third mode In the third mode, the controller controls the corresponding passage of the shunt device to be conductive, so that the battery, the power electronics device and the shunt device are connected to form a seventh liquid cooling circuit, and the battery is heated by the heat of the power electronics device.

[0076] In this embodiment, the seventh liquid cooling circuit includes at least one water pump, the battery is mounted on a cold panel of the battery, causing the cold panel of the battery to function as a coolant passage for the battery, and the power electronics equipment is mounted on a cold panel of the power electronics equipment, causing the power electronics equipment to function as a coolant passage for the power electronics equipment.

[0077] Specifically, in the third mode, the architecture of the energy storage thermal management system may be the same as that in the first mode, but the connection method of the valve unit and the operation method of each circuit are different, which will be introduced below.

[0078] Figure 10 shows the system principle diagram for the third mode, in which the compression refrigeration circuit is not operating, the controller controls the ten-way valve so that passage node 9 communicates with passage node 4 and passage node 8 communicates with passage node 5, and water pump 2, heat exchanger 1, and heat exchanger 2 are shielded from the system. The battery is connected to the power electronics through a shunt device to form a seventh liquid cooling circuit, water pump 1 provides driving force for the circuit, and heat from the power electronics is transferred to the coolant through the cold panel of the power electronics, raising the temperature of the coolant, which then enters the cold panel of the battery to heat the battery.

[0079] Figure 11 shows the system principle diagram for another third mode, in which the compression refrigeration circuit is not operating, the controller controls the eight-way valve so that passage node 3 communicates with passage node 8 and passage node 4 communicates with passage node 7, and the water pump 2 and heat exchanger are both shielded from the system. The battery is connected to the power electronics through a shunt device to form a seventh liquid cooling circuit, and water pump 1 provides driving force for the circuit. The heat from the power electronics is transferred to the coolant through the cold panel of the power electronics, raising the temperature of the coolant, and the high-temperature coolant enters the cold panel of the battery to heat the battery.

[0080] Figure 12 shows a system principle diagram for another third mode, in which the compression refrigeration circuit is not operating, the controller controls the ten-way valve so that passage node 4 communicates with passage node 9 and passage node 5 communicates with passage node 8, and the water pump 2 and heat exchanger are shielded from the system. The battery is connected to the power electronics through a shunt device to form a seventh liquid cooling circuit, water pump 1 provides driving force for the circuit, heat from the power electronics is transferred to the coolant through the cold panel of the power electronics, the temperature of the coolant rises, and the high-temperature coolant enters the cold panel of the battery to heat the battery.

[0081] Figure 13 shows a system principle diagram for another third mode, in which the compression refrigeration circuit is not operating, the controller controls the ten-way valve so that passage node 5 communicates with passage node 10 and passage node 6 communicates with passage node 9, and water pump 2, heat exchanger 1, and heat exchanger 2 are shielded from the system. The battery is connected to the power electronics through a shunt device to form a seventh liquid cooling circuit, water pump 1 provides driving force for the circuit, heat from the power electronics is transferred to the coolant through the cold panel of the power electronics, the temperature of the coolant rises, and the high-temperature coolant enters the cold panel of the battery to heat the battery.

[0082] In certain embodiments, an electric heater is provided in the seventh liquid cooling circuit, and the controller is further configured to heat the battery and the power electronics device using the electric heater.

[0083] 14 shows a system principle diagram for another third mode. In this mode, the compression refrigeration circuit is not operating, and the controller controls the eight-way valve so that passage node 3 communicates with passage node 8 and passage node 4 communicates with passage node 7. The water pump 2 and the heat exchanger are both shielded from the system. The battery, electric heater, shunt device, and power electronics are connected to form a seventh liquid cooling circuit. In this embodiment, the electric heater provides heat to the battery and power electronics to reach their start-up temperatures.

[0084] In some embodiments, when the operating mode is the third mode, the controller controls the corresponding passage of the flow dividing device to be conductive, so that the electric heater, the battery, and the flow dividing device are connected to form an eighth liquid cooling circuit, and the electric heater is used to heat the battery.

[0085] FIG. 15 shows another system principle diagram of the third mode. In the third mode, the compression refrigeration circuit is not operating, the controller controls the passage node 8 in the ten-way valve to communicate with the passage node 9, the battery, the electric heater, the water pump and the shunt device are connected to form the eighth liquid cooling circuit, and the electric heater heats the battery.

[0086] In this embodiment, the battery and the power electronics can simultaneously dissipate heat, eliminating the need for the power electronics to dissipate heat through compression refrigeration, integrating multiple operating modes and achieving the highest overall energy efficiency. Furthermore, the modular design, which integrates separate components into a whole, improves the energy density of the energy storage system and increases the space utilization rate of the energy storage system.

[0087] Based on the above embodiment of the energy storage thermal management system, another embodiment of the present invention provides an energy storage thermal management method, which is applied to the controller in the above energy storage thermal management system. The method flowchart of the energy storage thermal management method is shown in FIG. 16 , and specifically includes the following steps: S201: when the energy storage thermal management system detects that a predetermined operation mode switching condition is met, determine a current operation mode of the energy storage thermal management system, where the operation mode is one of a first operation mode, a second operation mode, and a third operation mode; S202: The energy storage thermal management system controls the corresponding passage of the shunt device to be conductive based on the current operating mode, so that when the operating mode is the first mode, the battery performs heat exchange using a compression refrigeration method and the power electronic equipment performs heat exchange using a liquid-cooled heat exchange method; when the operating mode is the second mode, the battery and the power electronic equipment each perform heat exchange using a liquid-cooled heat exchange method; and when the operating mode is the third mode, the battery and the power electronic equipment perform heat exchange, and / or the battery and the electric heater perform heat exchange.

[0088] In one embodiment of the present invention, based on the above implementation steps, preferably, the step of detecting that the energy storage thermal management system satisfies a predetermined operation mode switching condition includes: Obtaining a current ambient temperature to determine an operation mode of the energy storage thermal management system at a previous time; and determining that the energy storage thermal management system satisfies a predetermined operating mode switching condition if the current ambient temperature does not fall within a temperature range corresponding to the operating mode at the immediately preceding time and the minimum temperature difference between the current ambient temperature and the temperature range is greater than a predetermined hysteresis threshold.

[0089] In this embodiment, first, it is determined whether the current operating time of the energy storage thermal management system is the start time, and if it is the start time, it is determined that the energy storage thermal management system meets the operating mode switching condition; if it is not the start time, it is determined that the operating mode of the energy storage thermal management system at the previous time, and 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 predetermined hysteresis threshold, it is determined that the energy storage thermal management system meets the predetermined operating mode switching condition. By setting the hysteresis threshold, frequent switching of the operating mode can be avoided.

[0090] In one embodiment provided by the present invention, based on the above implementation process, preferably, the step of determining the current operation mode of the energy storage thermal management system includes: obtaining a current ambient temperature; determining a target temperature range in which the current ambient temperature is located; determining an operating mode corresponding to the target temperature range as a current operating mode of the energy storage thermal management system.

[0091] In this embodiment, different operating modes correspond to different temperature ranges, for example, the first mode corresponds to a first temperature range, the second mode corresponds to a second temperature range, and the third mode corresponds to a third temperature range, and any temperature value in the first temperature range is greater than each temperature value in the second temperature range, and any temperature value in the second temperature range is greater than each temperature value in the third temperature range.

[0092] For the implementation process of the specific steps of this embodiment, please refer to the corresponding description of the above embodiment, and no detailed description will be given here.

[0093] In this embodiment, the energy storage thermal management system includes a controller, a battery, power electronics, and a valve unit, the valve unit including at least one solenoid valve for a predetermined passage. The controller controls the corresponding solenoid valve in the valve unit to open the corresponding passage according to the operating mode of the energy storage thermal management system. In a first mode, the battery dissipates heat through compression refrigeration and the power electronics dissipates heat through liquid-cooling heat exchange. In a second mode, the battery and the power electronics both dissipate heat through liquid-cooling heat exchange. In a third mode, the battery is heated by the heat from the power electronics. That is, the present invention achieves heat dissipation for the battery and the power electronics in different operating modes, and selects different heat dissipation methods according to different operating modes to meet the heat dissipation needs of the battery and the power electronics, while simultaneously meeting the heat dissipation needs of the battery and the power electronics.

[0094] The above description of the disclosed embodiments enables one skilled in the art to make or use the present invention. Many modifications of these embodiments will be 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 present invention. Therefore, the present invention is not limited to the embodiments described herein but is accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage thermal management system, comprising: a controller, a battery, power electronics, and a shunt device; The controller determines an operating mode of the energy storage management system, the operating mode being one of a first mode, a second mode, and a third mode, and controls the corresponding passage of the flow dividing device to be conductive based on the operating mode of the energy storage thermal management system, so that when the operating mode is the first mode, the battery performs heat exchange using a compression refrigeration method and the power electronic equipment performs heat exchange using a liquid-cooling heat exchange method, when the operating mode is the second mode, the battery and the power electronic equipment each perform heat exchange using a liquid-cooling heat exchange method, and when the operating mode is the third mode, the battery and the power electronic equipment perform heat exchange and / or the battery and an electric heater perform heat exchange.

2. 2. The energy storage thermal management system according to claim 1, wherein the compression refrigeration circuit in the energy storage thermal management system and the liquid cooling circuit in which the power electronics equipment is located share a liquid-cooled condenser, and the energy storage thermal management system performs heat exchange using a fluid.

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

4. 2. The energy storage thermal management system according to claim 1, wherein when the operation mode is the first mode, a condenser used in the compression refrigeration method is a liquid-cooled condenser, and the liquid-cooled condenser and the power electronics device are in the same liquid-cooled circuit.

5. The energy storage thermal management system according to claim 4 , wherein the liquid-cooled condenser and the power electronics device are connected in series in the liquid-cooled circuit.

6. The energy storage thermal management system includes at least one set of heat exchangers, and the controller 6. The energy storage thermal management system of claim 5, wherein the power electronics equipment, the at least one heat exchanger, the flow dividing device, and the liquid-cooled condenser are connected to form a first liquid-cooled circuit, and the power electronics equipment dissipates heat in a liquid-cooled heat exchange manner; the battery, the flow dividing device, and the evaporator in the compression refrigeration circuit are connected to form a second liquid-cooled circuit, and the battery dissipates heat in a compression refrigeration manner, by controlling the corresponding passages of the flow dividing device to be conductive.

7. 7. The energy storage thermal management system of claim 6, wherein the flow dividing device in the energy storage thermal management system includes a valve unit with a plurality of predetermined passages, and the controller controls corresponding passages in the valve units with a plurality of predetermined passages to be conductive, so that the power electronics equipment, the flow dividing device, the liquid-cooled condenser, and the at least one set of heat exchangers are connected to form the first liquid-cooled circuit, and the battery, the flow dividing device, and the evaporator in the compression refrigeration circuit are connected to form the second liquid-cooled circuit.

8. the liquid-cooled condenser and the power electronics device are connected in parallel in the liquid-cooled circuit; 5. The energy storage thermal management system according to claim 4, wherein the energy storage thermal management system includes at least one set of heat exchangers, and the flow dividing device includes a plurality of valve units for predetermined passages, and the low-temperature coolant output from the at least one set of heat exchangers is divided by a specific valve unit of the flow dividing device to flow through the fluid passages of the liquid-cooled condenser and the power electronics equipment, respectively.

9. 2. The energy storage thermal management system of claim 1, wherein when the operating mode is the second mode, the controller controls the corresponding passages of the shunt device to be conductive, thereby forming a third liquid cooling circuit including the battery and a fourth liquid cooling circuit including the power electronics equipment, respectively, and the third liquid cooling circuit and the fourth liquid cooling circuit are independent of each other.

10. 10. The energy storage thermal management system of claim 9, wherein the energy storage thermal management system includes two sets of heat exchangers, one set of the heat exchangers being located in the third liquid cooling circuit and the other set of the heat exchangers being located in the fourth liquid cooling circuit.

11. the energy storage thermal management system includes at least one set of heat exchangers; 2. The energy storage thermal management system of claim 1, wherein when the operating mode is the second mode, the controller controls the corresponding passage of the flow dividing device to be conductive, thereby forming a fifth liquid cooling circuit, and the battery and the power electronics device are connected in series in the fifth liquid cooling circuit, and share the heat exchanger to dissipate heat.

12. the energy storage thermal management system includes at least one set of heat exchangers; 2. The energy storage thermal management system of claim 1, wherein when the operating mode is the second mode, the controller controls the corresponding passage of the flow dividing device to be conductive, thereby forming a sixth liquid cooling circuit, and the battery and the power electronics device are connected in parallel in the sixth liquid cooling circuit, and share the heat exchanger to dissipate heat.

13. 2. The energy storage thermal management system of claim 1, wherein when the operating mode is the third mode, the battery is installed on a battery cold panel, the power electronic equipment is installed on a power electronic equipment cold panel, and the controller controls the corresponding passages of the shunt device to be conductive, so that the battery cold panel, the power electronic equipment cold panel, and the shunt device are connected to form a seventh liquid cooling circuit, and the battery is heated by the heat of the power electronic equipment.

14. The energy storage thermal management system of claim 13, wherein the electric heater is provided in the seventh liquid cooling circuit, and the controller further uses the electric heater to heat the battery and the power electronics device.

15. 2. The energy storage thermal management system of claim 1, wherein when the operating mode is the third mode, the corresponding passage of the flow dividing device is controlled to be conductive, so that the electric heater, the battery, and the flow dividing device are connected to form an eighth liquid cooling circuit, and the battery is heated using the electric heater.

16. An energy storage thermal management method, which is applied to a controller in an energy storage thermal management system according to any one of claims 1 to 15, and the energy storage thermal management method comprises: When the energy storage thermal management system detects that a predetermined operation mode switching condition is satisfied, determining a current operation mode of the energy storage thermal management system, wherein the operation mode is one of a first operation mode, a second operation mode, and a third operation mode; and controlling the energy storage thermal management system to open corresponding passages of a flow dividing device based on a current operating mode, so that when the operating mode is the first mode, the battery exchanges heat using a compression refrigeration method and the power electronic equipment exchanges heat using a liquid-cooled heat exchange method, when the operating mode is the second mode, the battery and the power electronic equipment each exchange heat using a liquid-cooled heat exchange method, and when the operating mode is the third mode, the battery and the power electronic equipment exchange heat and / or the battery and an electric heater exchange heat.

17. The step of detecting that the energy storage thermal management system satisfies a predetermined operation mode switching condition includes: Obtaining a current ambient temperature to determine an operation mode of the energy storage thermal management system at a previous time; 17. The energy storage thermal management method of claim 16, further comprising: determining that the energy storage thermal management system satisfies a predetermined operating mode switching condition when the current ambient temperature does not fall within a temperature range corresponding to the operating mode at the immediately preceding time and the minimum temperature difference between the current ambient temperature and the temperature range is greater than a predetermined hysteresis threshold.

18. determining a current operating mode of the energy storage thermal management system; obtaining a current ambient temperature; determining a target temperature range in which the current ambient temperature is located; 17. The energy storage thermal management method of claim 16, further comprising: establishing an operating mode corresponding to the target temperature range as a current operating mode of the energy storage thermal management system.

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