All-climate thermal management system and method for energy storage power station with cross-season energy storage device

Abstract

The present application relates to the field of battery thermal safety management, and in particular to an all-weather thermal management system and method for an energy storage power station with a cross-season energy storage device. The present application realizes the heating or cooling of battery modules in the prefabricated cabin of the energy storage power station through the combined operation of a refrigerant circulation loop, a circulating water loop, a switching valve group, a multi-cavity heat exchanger, a water storage tank, an accumulator, a photovoltaic collector, and a resistance wire heater. The present application effectively guarantees the requirements for battery heating / cooling and temperature consistency control under all-weather working conditions; at the same time, it can realize cross-season energy storage and waste heat utilization, avoid energy loss, improve energy utilization efficiency, and achieve the purpose of reducing thermal management energy consumption.

Description

Technical Field

[0001] The present application relates to the field of battery thermal safety management, and in particular to a full-climate thermal management system and method for an energy storage power station with a cross-season energy storage device. Background Art

[0002] According to the "GB / T44026-2024 Technical Specification for Prefabricated Lithium-ion Battery Energy Storage Systems," increased energy consumption of the energy storage thermal management unit will reduce the system's operating efficiency. Therefore, the energy storage thermal management unit must not only meet the energy storage system's cooling (heating) requirements but also reduce operating power consumption to ensure efficient system operation. Energy consumption is a key indicator of the operating cost of a thermal management system in an energy storage power station. A low-energy system not only reduces operating expenses but also improves the overall energy storage system's energy efficiency, optimizing economics.

[0003] Current energy storage thermal management often uses variable frequency control of thermal management units (compressors, fans, and water pumps) to reduce system energy consumption. Chinese application CN202410348849.1 mentions an energy storage thermal management system that utilizes a DC variable frequency compressor refrigeration cycle, achieving automatic control and energy savings. Chinese application CN202311692890.2 utilizes fiber optic temperature measurement, offering a flexible and simple layout that enables accurate temperature data collection for battery modules 3. The liquid cooling system executes temperature variable frequency adjustment commands to adjust the overall temperature of the battery cluster and / or the local temperature of individual battery modules 3, bringing the temperature of the battery modules 3 to a preset level and ensuring temperature consistency across all battery modules 3.

[0004] However, current energy storage thermal management technology still cannot effectively guarantee the requirements of battery heating / cooling and temperature consistency control under all-weather conditions, and at the same time realize the cross-seasonal energy storage waste heat utilization to achieve the purpose of reducing thermal management energy consumption. There is an urgent need to provide an all-weather thermal management system and method for energy storage power stations.

[0005] The above information disclosed in this background technology is only used to increase the understanding of the background technology of this application. Therefore, it may contain information that does not constitute the prior art known to ordinary technicians in this field. Summary of the Invention

[0006] In order to overcome the above-mentioned problems existing in the prior art, the present application provides a full-climate thermal management system and method for an energy storage power station with a cross-seasonal energy storage device. The energy storage power station thermal management system proposed in this application has battery heating / cooling, temperature consistency control, and battery compartment air environment temperature / humidity control functions.

[0007] This application can effectively guarantee the needs of battery heating / cooling and temperature consistency control under all climate conditions; at the same time, it can realize cross-seasonal energy storage and inverter waste heat utilization, avoid energy loss, improve energy utilization efficiency, and achieve the purpose of reducing thermal management energy consumption.

[0008] In some embodiments of the present application, a full-climate thermal management system for an energy storage power station with a cross-seasonal energy storage device includes:

[0009] A refrigerant circulation circuit, wherein the refrigerant circulation circuit is sequentially connected to a compressor, a four-way valve, an indoor heat exchanger, a first throttle valve, and an outdoor heat exchanger;

[0010] A circulating water loop, comprising a liquid flow pipe network water inlet branch, a liquid flow pipe network water inlet main trunk, a liquid flow pipe network water outlet branch, and a liquid flow pipe network water outlet main trunk;

[0011] The energy storage power station prefabricated cabin has one end connected to the liquid flow pipe network water inlet main trunk via a liquid flow pipe network water inlet branch, and the other end connected to the liquid flow pipe network water outlet main trunk via a liquid flow pipe network water outlet branch. The inverter device and battery modules are distributed in the energy storage power station prefabricated cabin;

[0012] A multi-chamber heat exchanger comprising at least a first heat exchange chamber, a second heat exchange chamber, and a third heat exchange chamber; one end of the first heat exchange chamber is connected to a main water inlet pipe of a liquid flow pipe network, and the other end is connected to a main water outlet pipe of the liquid flow pipe network; one end of the second heat exchange chamber is connected to a refrigerant circulation loop between a four-way valve and an indoor heat exchanger via a first refrigerant pipe, and the other end is connected to an outdoor heat exchanger via a second refrigerant pipe; a second throttle valve is further provided on the second refrigerant pipe between the second heat exchange chamber and the outdoor heat exchanger;

[0013] a water storage tank, a first end of which is connected to the main outlet pipe of the liquid flow pipe network, and a second end of which is connected to the photovoltaic collector through a water channel;

[0014] an accumulator, one end of which is connected to one end of the third heat exchange chamber through the accumulator-multi-chamber heat exchanger connecting water channel, and the other end of which is connected to the third end of the water storage tank through the accumulator outlet water channel;

[0015] Switch valve group, used to control the on and off of the pipeline;

[0016] The circulating water loop also includes a resistance wire heater-multi-cavity heat exchanger connecting water channel, one end of which is connected to the accumulator-multi-cavity heat exchanger connecting water channel, and the other end is connected to the accumulator outlet water channel. The resistance wire heater is arranged on the resistance wire heater-multi-cavity heat exchanger connecting water channel.

[0017] In some embodiments of the present application, the circulating water loop also includes a resistance wire heater-multi-cavity heat exchanger connecting water channel, one end of which is connected to the accumulator-multi-cavity heat exchanger connecting water channel, and the other end is connected to the accumulator outlet water channel, and the resistance wire heater is arranged on the resistance wire heater-multi-cavity heat exchanger connecting water channel.

[0018] In some embodiments of the present application, an inverter device, a battery module and a battery liquid flow heat exchanger are provided in the prefabricated cabin of the energy storage power station; the battery liquid flow heat exchanger is located below the battery module, one end of the inverter device is connected to the liquid flow pipe network inlet pipe branch through the inverter side heat exchanger inlet water channel, and the other end is connected to the liquid flow pipe network outlet pipe branch through the inverter side heat exchanger outlet water channel; one end of the battery liquid flow heat exchanger is connected to the liquid flow pipe network inlet pipe branch through the battery side heat exchanger inlet water channel, and the other end is connected to the liquid flow pipe network outlet pipe branch through the battery side heat exchanger outlet water channel.

[0019] In some embodiments of the present application, the accumulator includes a phase change material filling cavity and a ribbed heat exchange plate, and the accumulator inlet water channel and the accumulator outlet water channel are penetrated by the ribbed heat exchange plate, and the coolant in the water channel exchanges heat with the phase change material;

[0020] The phase change material in the phase change material filling cavity is paraffin, crystalline hydrated salt, and formic acid, and the phase change temperature range is 35-60°C;

[0021] The phase change material filling cavity is filled with a single material or different phase change materials are filled in partitions; among them, when different phase change materials are filled in partitions, the material with a high phase change temperature is filled near the water inlet side, and the material with a low phase change temperature is filled near the water outlet side, the purpose of which is to use temperature difference to drive heat exchange.

[0022] In some embodiments of the present application, the switch valve group includes: a liquid flow network exhaust valve arranged upstream of the liquid flow network water inlet main pipe, a liquid flow network branch flow balancing valve arranged on the upstream side of the liquid flow network water inlet branch, used to control the water flow entering the inverter device and the battery liquid flow heat exchanger; a battery side water flow balancing valve arranged on the battery side heat exchanger inlet water path; an inverter water path switch valve arranged on the inverter side heat exchanger inlet water path; a liquid flow network outlet branch arranged on the battery side heat exchanger inlet water path. The inverter water reversing valve on the inverter; the liquid flow pipe network return water main switch valve set on the liquid flow pipe network outlet main; the photovoltaic collector water switch valve is used to control the water inlet or outlet of the photovoltaic collector; the resistance wire heater-multi-cavity heat exchanger connecting water path is provided with a multi-cavity heat exchanger-resistance wire side water circuit switch valve; the multi-cavity heat exchanger-accumulator side water path switch valve is provided on the pipeline connecting the multi-cavity heat exchanger and the accumulator outlet water path; the accumulator outlet is connected to the third end of the water tank. The pipeline is provided with an accumulator-water tank side water switch valve; the pipeline connecting the accumulator inlet water channel and the water tank is provided with a water tank-accumulator water switch valve; the accumulator outlet pipeline is provided with an accumulator outlet water switch valve; the first accumulator-resistance wire side water switch valve is provided between the water channel connecting the accumulator and the resistance wire heater; the accumulator water switch valve is provided at the water inlet of the accumulator; the resistance wire heater-multi-cavity heat exchanger connecting water channel and the accumulator inlet water channel are connected to the accumulator. A second accumulator-resistance wire side water channel switch valve is provided on the water channel on the side of the accumulator inlet water channel away from the accumulator; an accumulator-multi-cavity heat exchanger water channel switch valve is provided on the resistance wire heater-multi-cavity heat exchanger connecting water channel away from the resistance wire heater; a resistance wire-multi-cavity heat exchanger water channel switch valve is provided on the first refrigerant pipeline; a multi-cavity heat exchanger-refrigerant circuit switch valve is provided on the first refrigerant pipeline; a first three-way valve is provided at the intersection of the first refrigerant pipeline and the refrigerant circulation circuit.

[0023] In some embodiments of the present application, an inverter circuit water pump is provided on the outlet branch of the liquid flow network; a liquid flow network water pump is provided on the pipeline connecting the first heat exchange chamber and the main outlet main of the liquid flow network; a water tank-accumulator water pump is provided on the pipeline connecting the accumulator outlet waterway and the water tank; and a resistance wire waterway pump is provided on the waterway connecting the resistance wire heater and the multi-cavity heat exchanger.

[0024] In some embodiments of the present application, an inverter outlet temperature sensor is provided on the inverter side heat exchanger outlet water channel; a battery module temperature sensor is provided at the battery module; a cabin environment temperature sensor is provided in the prefabricated cabin of the energy storage power station; an accumulator outlet temperature sensor is provided on the accumulator outlet water channel; and a water tank temperature sensor is provided at the water tank for detecting the water temperature in the water tank.

[0025] In other embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device is provided, using the thermal management system described in the above embodiment, the thermal management method comprising:

[0026] Mode 1: Inverter waste heat recovery to heat the battery; Mode 2: Cross-seasonal accumulator condensation heat release process to heat the battery; Mode 3: Photovoltaic collector hot water to heat the battery; Mode 4: Heat pump system heating; Mode 5: Resistance wire electric heating; Mode 6: Cross-seasonal accumulator melting heat absorption to cool the battery; Mode 7: Water tank natural cooling mode; Mode 8: Heat pump system cooling mode; Mode 9: Heat pump system air environment heating mode; Mode 10: Heat pump system air environment cooling mode.

[0027] In some embodiments of the present application, mode 1: inverter waste heat is recovered to heat the battery module, specifically: the controller determines the battery heating / cooling requirements, and when the temperature detected by the inverter water outlet temperature sensor meets the first condition, that is, reaches T1, the switch valve group is controlled to make the water circulation direction from inverter device → battery liquid flow heat exchanger → inverter device, and the inverter heat is used for heating. By adjusting the speed of the inverter circuit water pump, the inverter heat exchange is realized for battery heating to meet the low-temperature heating power requirement of the battery.

[0028] In some embodiments of the present application, mode 2: heating the battery during the cross-seasonal accumulator condensation and heat release process, specifically: the controller determines the battery heating / cooling needs, and when the temperature T2 detected by the accumulator outlet temperature sensor meets the second condition, controls the switch valve group to circulate the water in the accumulator from the accumulator → accumulator outlet water channel → the third heat exchange chamber → the accumulator-multi-chamber heat exchanger connecting water channel → the accumulator inlet water channel → the accumulator, so that the coolant in the accumulator outlet water channel exchanges heat with the coolant in the liquid flow pipe network in the multi-chamber heat exchanger. After the temperature of the coolant in the liquid flow pipe network rises, it heats the battery module.

[0029] In some embodiments of the present application, mode three: the photovoltaic collector uses hot water to heat the battery, and the photovoltaic collector heats the coolant in the water tank. When the water tank temperature sensor detects that T3 meets the third condition, the hot water is in the multi-chamber heat exchanger to heat the liquid flow pipeline network of the energy storage battery module; the opening of the switch valve group is controlled to allow the coolant to circulate in the pipeline according to the water tank → accumulator-multi-chamber heat exchanger connecting water path → third heat exchange chamber → accumulator → water tank. The photovoltaic collector heats the coolant for the water tank and heats the coolant for the energy storage liquid flow pipeline network.

[0030] In some embodiments of the present application, mode four: heat pump system provides heat, specifically, the heat pump system realizes heat release of the refrigerant in the second heat exchange chamber through the refrigerant circulation loop, and heat exchange with the first heat exchange chamber and coolant circulation to achieve the purpose of heating the battery module; specifically: under the condition of heating the battery module, the heat pump system is in the heating mode, at this time the refrigerant is compressed by the compressor, passes through the first three-way valve, and enters the second heat exchange chamber for condensation and heat release, and the first heat exchange chamber absorbs the heat of the refrigerant to heat the battery module; then, the refrigerant is throttled and reduced in pressure through the second throttle valve and enters the outdoor heat exchanger.

[0031] In some embodiments of the present application, mode five: heating by a resistance wire heater, specifically: when the battery module is heated at low temperature, the controller controls the resistance wire heater to turn on, opens the resistance wire-multi-cavity heat exchanger water circuit switch valve and the multi-cavity heat exchanger-resistance wire side water circuit switch valve, and realizes the circulation of the coolant in the resistance wire heater and the third heat exchange cavity, and the coolant heated by the resistance wire exchanges heat with the energy storage liquid flow pipeline network through the internal flow channel of the multi-cavity heat exchanger.

[0032] In some embodiments of the present application, mode six: the cross-season accumulator melts and absorbs heat to cool the battery. The phase change material filled in the accumulator absorbs heat through solid-liquid phase change to cool the coolant. Then, the heat generated by the battery module circulates through the coolant of the energy storage liquid flow network, and heat is exchanged with the coolant on the accumulator side through the multi-cavity heat exchanger, thereby completing the cooling of the battery; specifically, the opening and closing of the switching valve group is controlled to make the coolant on the accumulator side circulate in the accumulator and the third heat exchange cavity, and the coolant carrying the heat generated by the battery enters the accumulator, realizing the heat transfer to the phase change material, and the phase change material absorbs heat and melts to complete the cooling of the battery module.

[0033] In some embodiments of the present application, mode seven: natural cooling mode of the water tank, the heat generated by the battery is circulated through the coolant of the energy storage liquid flow network, and heat exchange is achieved between the coolant on the battery side and the coolant on the water tank side through the multi-cavity heat exchanger to complete the battery cooling; in the multi-cavity heat exchanger, the coolant entrained with the heat generated by the battery transfers the heat to the coolant on the water tank side, and the coolant temperature in the water tank is reduced through natural cooling, thereby achieving the purpose of cooling the battery.

[0034] In some embodiments of the present application, mode eight: heat pump system cooling mode. When cooling the battery, the heat pump system is in cooling mode. The refrigerant is compressed by the compressor and enters the outdoor heat exchanger through the four-way valve for condensation and heat release. The second throttle valve throttles and reduces the pressure and enters the second heat exchange chamber. At this time, the energy storage liquid flow pipeline coolant that carries the heat generated by the battery is absorbed, and the refrigerant vaporizes and absorbs heat, thereby completing the cooling of the battery side coolant.

[0035] In some embodiments of the present application, mode nine: heat pump system air environment heating mode, the heat pump system is in heating mode, at this time the refrigerant is compressed by the compressor, and is diverted through the four-way valve into the indoor heat exchanger for condensation and heat release. At this time, the air environment on the battery side is heated, and after throttling and reducing the pressure through the first throttle valve, it enters the outdoor heat exchanger, and the refrigerant vaporizes and absorbs heat, thereby completing the cycle.

[0036] In some embodiments of the present application, mode ten: air environment cooling mode of the heat pump system. When cooling the battery, the heat pump system is in cooling mode. At this time, the refrigerant passes through the compressor into the outdoor heat exchanger, condenses and releases heat, and discharges the heat to the outdoor environment. Then, the refrigerant passes through the first throttle valve to throttle and reduce the pressure, and then enters the indoor heat exchanger. The refrigerant vaporizes and absorbs heat to cool the air environment, thereby completing the cycle.

[0037] In some embodiments of the present application, when heating the battery, modes one to five can be freely combined; when cooling the battery, modes six to eight can be freely combined.

[0038] In some embodiments of the present application, when a heat pump system is used for heating or cooling, the controller increases the heating / cooling capacity by controlling the compressor speed and the switching of the four-way valve; for heating and cooling control of the prefabricated cabin of the energy storage power station, the controller increases the heating / cooling capacity of the indoor heat exchanger by controlling the indoor heat exchanger fan speed, the compressor speed, and the opening of the first throttle valve and the second throttle valve; when heating or cooling the air in the prefabricated cabin of the energy storage power station, the controller can adjust the humidity.

[0039] In some embodiments of the present application, the thermal management system further includes a controller, which is electrically connected to the above-mentioned valves, water pumps, and temperature sensors.

[0040] In some embodiments of the present application, in order to improve the battery heating efficiency, the controller adjusts the speed of the inverter circuit water pump to increase the water circulation flow rate to achieve the purpose of rapid heat exchange.

[0041] In some embodiments of the present application, in order to accelerate the heat exchange rate of the liquid flow network to the battery, the speed of the liquid flow network water pump is increased, the flow rate of the liquid flow network is increased, and the rapid temperature rise of the battery is achieved; at the same time, in order to control the temperature consistency of multiple battery cells in different compartments, the controller first adjusts the flow of the liquid flow network water inlet pipe branch and adjusts the liquid flow network branch flow balancing valve to achieve flow distribution. Secondly, the water inlet flow distribution of the battery liquid flow heat exchanger is adjusted, and the controller regulates the opening of the battery side water flow balancing valve to ensure that the monitoring temperature deviation of the battery module temperature sensor is <2°C.

[0042] In some embodiments of the present application, the heat pump system can also achieve cabin environment air humidity control through fresh air heat exchange.

[0043] In some embodiments of the present application, the heating and cooling of the battery module are achieved by regulating the circulation flow of the coolant in the energy storage liquid flow network, that is, the controller controls the speed of the water pump on the liquid flow network side, increases the speed, and increases the flow rate to achieve the purpose of rapid heating and cooling of the battery; battery heating and cooling require attention to temperature consistency. The controller adopts a double-layer strategy in the battery temperature equalization strategy, with the temperature difference between the battery modules <2°C as the goal, and adjusts the valve opening of the liquid flow main pipe of each battery compartment. Secondly, the flow balancing valve of the liquid flow network branch is adjusted to regulate the battery module inlet flow. When the temperature difference between the battery modules is close, the flow rate is guaranteed to remain unchanged. When the temperature difference between the battery modules is large, the flow rate increases on the side with high battery module temperature to accelerate cooling, and the valve on the side with low battery module temperature is closed and the flow rate is reduced to reduce the temperature difference between different battery modules.

[0044] This application realizes the heating and cooling functions of the DC high-voltage battery system in the prefabricated cabin and the regulation of the air environment temperature and humidity through the joint operation of a heat pump system, a photovoltaic collector, an accumulator and a resistance wire heating system. In addition, it is designed for AC and DC integration, and uses a liquid flow pipe network to form integrated thermal management on the AC and DC sides. At the same time, it uses the heat of the AC inverter to provide a heating source for the low-temperature working conditions of the battery. This application effectively guarantees the needs of battery heating / cooling and temperature consistency control under all climate conditions; at the same time, it can realize cross-seasonal energy storage and waste heat utilization, avoid energy loss, improve energy utilization efficiency, and achieve the purpose of reducing thermal management energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present application is further described below with reference to the accompanying drawings and examples.

[0046] Figure 1 Schematic diagram of the thermal management system in some embodiments of the present application Figure 1 ;

[0047] Figure 2 Schematic diagram of the thermal management system in some embodiments of the present application Figure 2 ;

[0048] Among them, 1- energy storage power station prefabricated cabin, 2- inverter device, 3- battery module, 4- battery liquid flow heat exchanger, 5- battery side heat exchanger inlet water channel, 6- battery side heat exchanger outlet water channel, 7- inverter side heat exchanger inlet water channel, 8- inverter side heat exchanger outlet water channel, 9- liquid flow pipe network inlet pipe branch, 10- liquid flow pipe network inlet pipe main trunk, 11- liquid flow pipe network outlet pipe branch, 12- liquid flow pipe network outlet pipe main trunk, 13- multi-chamber heat exchanger, 14- second heat exchange chamber, 15- refrigerant circulation loop, 16- outdoor side heat exchanger, 17- four-way valve, 18- compressor, 19- indoor side heat exchanger , 20-outdoor heat exchanger fan, 21-indoor heat exchanger fan, 22-photovoltaic collector, 23-accumulator, 24-phase change material filling cavity, 25-ribbed heat exchange plate, 26-accumulator inlet water channel, 27-accumulator outlet water channel, 28-accumulator-multi-cavity heat exchanger connecting water channel, 29-resistance wire heater-multi-cavity heat exchanger connecting water channel, 30-resistance wire heater, 31-water storage tank, 32-first heat exchange cavity, 33-third heat exchange cavity, 34-first throttle valve; 101-controller, 102-liquid flow pipe network exhaust valve, 103-liquid flow pipe network branch flow balancing valve, 104-electric Pool side water flow balancing valve, 105-inverter water circuit switch valve, 106-inverter water circuit reversing valve; 201-liquid flow network return main pipe switch valve, 202-photovoltaic collector water circuit switch valve, 203-second throttle valve, 204-multi-chamber heat exchanger-resistance wire side water circuit switch valve, 205-multi-chamber heat exchanger-accumulator side water circuit switch valve, 206-accumulator-water tank side water circuit switch valve, 207-water tank-accumulator water circuit switch valve, 208-accumulator outlet water circuit switch valve, 209-first accumulator-resistance wire side water circuit switch valve, 210-accumulator water circuit switch valve, 211 -Second accumulator-resistance wire side water circuit switching valve, 212-Accumulator-multi-cavity heat exchanger water circuit switching valve, 213-Resistance wire-multi-cavity heat exchanger water circuit switching valve, 214-Multi-cavity heat exchanger-refrigerant circuit switching valve, 215-First three-way valve, 301-Inverter circuit water pump, 302-Liquid flow network water pump, 303-Water tank-accumulator water pump, 304-Resistance wire water circuit water pump; 401-Inverter water outlet temperature sensor, 402-Battery module temperature sensor, 403-Cabin ambient temperature sensor, 404-Accumulator outlet temperature sensor, 405-Water tank temperature sensor. DETAILED DESCRIPTION

[0049] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings and specific implementation methods. However, those skilled in the art will understand that the embodiments described below are only part of the embodiments of the present application, not all of the embodiments, and are only used to illustrate the present application and should not be regarded as limiting the scope of the present application.

[0050] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0051] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or relative positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned directionality descriptions may be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are met.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "connected" should be understood broadly, such as to refer to fixed connection, detachable connection, and integral connection. Connections may be direct or indirect through an intermediary, and may include internal communication between two components or electrical connection between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0054] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, article, or device comprising the element.

[0055] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0056] The following combination Figure 1 and 2 The solution of this application is further explained and illustrated.

[0057] In some embodiments of the present application, a full-climate thermal management system for an energy storage power station with a cross-season energy storage device includes:

[0058] A refrigerant circulation circuit 15 is connected in sequence to a compressor 18, a four-way valve 17, an indoor heat exchanger 19, a first throttle valve 34, and an outdoor heat exchanger 16;

[0059] A circulating water circuit, comprising a liquid flow pipe network water inlet branch 9, a liquid flow pipe network water inlet main trunk 10, a liquid flow pipe network water outlet branch 11 and a liquid flow pipe network water outlet main trunk 12;

[0060] The energy storage power station prefabricated cabin 1 has one end connected to the liquid flow pipe network water inlet main trunk 10 through the liquid flow pipe network water inlet branch 9, and the other end connected to the liquid flow pipe network water outlet main trunk 12 through the liquid flow pipe network water outlet branch 11;

[0061] The multi-chamber heat exchanger 13 includes at least a first heat exchange chamber 32, a second heat exchange chamber 14, and a third heat exchange chamber 33. One end of the first heat exchange chamber 32 is connected to the liquid flow network water inlet main trunk 10, and the other end is connected to the liquid flow network water outlet main trunk 12. One end of the second heat exchange chamber 14 is connected to the refrigerant circulation loop 15 between the four-way valve 17 and the indoor heat exchanger 19 through a first refrigerant pipeline, and the other end is connected to the outdoor heat exchanger 16 through a second refrigerant pipeline. A second throttle valve 203 is also provided on the second refrigerant pipeline between the second heat exchange chamber 14 and the outdoor heat exchanger 16.

[0062] A water storage tank 31, a first end of which is connected to the main outlet pipe 12 of the liquid flow network, and a second end of which is connected to the photovoltaic collector 22 through a water channel;

[0063] The accumulator 23 has one end connected to one end of the third heat exchange chamber 33 through the accumulator-multi-chamber heat exchanger connecting water path 28, and the other end connected to the third end of the water storage tank 31 through the accumulator outlet water path 27;

[0064] The switch valve group is used to control the on and off of the pipeline.

[0065] In some embodiments of the present application, the water tank has at least three functions, the first of which is to be arranged as a water tank at a high position in the system to play the role of overflow water replenishment; the second function is to serve as a water tank heating the photovoltaic collector 22; the third function is to provide cold / hot water for the accumulator 23, realize the melting and condensation phase change regulation of the phase change material, and cool and heat the battery module 3.

[0066] The cross-seasonal heat storage can achieve the photovoltaic collector 22 heating the water tank 31, and the hot water enters the accumulator 23 to melt the phase change material; the accumulator 23 can also use resistance wire to assist heating to achieve phase change material melting and heat storage.

[0067] In some embodiments of the present application, the reversing action of the four-way valve 17 realizes the regulation of heat absorption and heat release of the refrigerant in the multi-chamber heat exchanger 13. At the same time, the indoor heat exchanger 19 is connected in parallel with the second heat exchange chamber 14 circuit to realize the heat exchange heating / cooling regulation of the prefabricated cabin air.

[0068] In some embodiments of the present application, the energy accumulator 23 is combined with the photovoltaic collector 22 to store heat from the melting of the phase change material; resistance wire heating can also be used to store heat from the melting of the phase change material.

[0069] In some embodiments of the present application, the circulating water loop also includes a resistance wire heater-multi-cavity heat exchanger connecting water path 29, one end of which is connected to the accumulator-multi-cavity heat exchanger connecting water path 28, and the other end is connected to the accumulator outlet water path 27, and the resistance wire heater 30 is arranged on the resistance wire heater-multi-cavity heat exchanger connecting water path 29.

[0070] In some embodiments of the present application, an inverter device 2, a battery module 3 and a battery liquid flow heat exchanger 4 are provided in the prefabricated cabin 1 of the energy storage power station; the battery liquid flow heat exchanger 4 is located below the battery module 3, and one end of the inverter device 2 is connected to the liquid flow pipe network inlet pipe branch 9 through the inverter side heat exchanger inlet water channel 7, and the other end is connected to the liquid flow pipe network outlet pipe branch 11 through the inverter side heat exchanger outlet water channel 8; one end of the battery liquid flow heat exchanger 4 is connected to the liquid flow pipe network inlet pipe branch 9 through the battery side heat exchanger inlet water channel 5, and the other end is connected to the liquid flow pipe network outlet pipe branch 11 through the battery side heat exchanger outlet water channel 6.

[0071] In some embodiments of the present application, the inverter device 2 and the battery module 3 are distributed in the prefabricated cabin 1 of the energy storage power station; the inverter device 2 and the battery module 3 are arranged in an integrated manner, which can form integrated thermal management through the liquid flow pipeline network, and at the same time realize the inverter waste heat recovery to heat the battery module 3.

[0072] In some embodiments of the present application, the accumulator 23 includes a phase change material filling chamber 24 and a ribbed heat exchange plate 25. The accumulator inlet water channel 26 and the accumulator outlet water channel 27 are penetrated by the ribbed heat exchange plate 25, and water in the water channel exchanges heat with the phase change material.

[0073] In some embodiments of the present application, the phase change material in the phase change material filling cavity is paraffin, crystalline hydrated salt, or formic acid, and the phase change temperature range is 35-60°C.

[0074] In some embodiments of the present application, the phase change material filling chamber 24 is filled with a single material or with different phase change materials in different zones. When different phase change materials are filled in different zones, the material with a higher phase change temperature is filled near the water inlet, and the material with a lower phase change temperature is filled near the water outlet. This is to utilize temperature differences to drive heat exchange.

[0075] In some embodiments of the present application, the switch valve group includes a liquid flow network exhaust valve 102 arranged upstream of the liquid flow network water inlet main pipe 10, a liquid flow network branch flow balancing valve 103 arranged on the upstream side of the liquid flow network water inlet branch 9, which is used to control the water flow entering the inverter device 2 and the battery liquid flow heat exchanger 4; a battery side water path flow balancing valve 104 arranged on the battery side heat exchanger inlet water path 5; an inverter water path switch valve 105 arranged on the inverter side heat exchanger inlet water path 7; and an inverter water path reversing valve arranged on the liquid flow network outlet branch 11. 106; a liquid flow network return main pipe switch valve 201 provided on the liquid flow network outlet main pipe 12; a photovoltaic collector water circuit switch valve 202, used to control the water inlet or outlet of the photovoltaic collector 22; a second throttle valve 203 is provided on the second refrigerant pipeline; a multi-cavity heat exchanger-resistance wire side water circuit switch valve 204 is provided on the resistance wire heater-multi-cavity heat exchanger connecting water circuit 29; a multi-cavity heat exchanger-accumulator side water circuit switch valve 205 is provided on the pipeline connecting the multi-cavity heat exchanger 13 and the accumulator outlet water circuit 27; a multi-cavity heat exchanger-accumulator side water circuit switch valve 205 is provided on the pipeline connecting the accumulator 23 outlet and the accumulator The pipeline connected to the third end of the tank 31 is provided with an accumulator-water tank side waterway switch valve 206; the pipeline connected to the accumulator inlet waterway 26 and the water tank 31 is provided with a water tank-accumulator waterway switch valve 207; the outlet pipeline of the accumulator 23 is provided with an accumulator outlet waterway switch valve 208; a first accumulator-resistance wire side waterway switch valve 209 is provided between the accumulator 23 and the waterway on the resistance wire side; an accumulator waterway switch valve 210 is provided at the water inlet of the accumulator 23; a resistance wire heater-multi-cavity heat exchanger connecting waterway 29 and the accumulator inlet is provided with a first accumulator-resistance wire side waterway switch valve 209; an accumulator waterway switch valve 210 is provided at the water inlet of the accumulator 23; a resistance wire heater-multi-cavity heat exchanger connecting waterway 29 and the accumulator inlet is provided with a first accumulator-resistance wire side waterway switch valve 211; a resistance wire heater-multi-cavity heat exchanger connecting waterway 29 and the accumulator inlet is provided with a first accumulator-resistance wire side waterway switch valve 212; a resistance wire heater-multi-cavity heat exchanger connecting waterway 29 and the accumulator inlet is provided with a first accumulator-resistance wire side waterway switch valve 213; a resistance wire heater-multi-cavity heat exchanger connecting waterway 29 and the accumulator inlet is provided with a first accumulator-resistance wire side waterway switch valve 214; a resistance wire heater-multi-cavity heat exchanger connecting waterway 29 and the accumulator inlet is provided with a first accumulator-resistance wire side waterway switch valve 215; a resistance wire heater A second accumulator-resistance wire side water channel switch valve 211 is provided on the water channel connected to the water channel 26; an accumulator-multi-cavity heat exchanger water channel switch valve 212 is provided on the water channel on the side of the accumulator inlet water channel 26 away from the accumulator 23; a resistance wire-multi-cavity heat exchanger water channel switch valve 213 is provided on the resistance wire heater-multi-cavity heat exchanger connecting water channel 29 away from the resistance wire heater 30; a multi-cavity heat exchanger-refrigerant circuit switch valve 214 is provided on the first refrigerant pipeline; and a first three-way valve 215 is provided at the intersection of the first refrigerant pipeline and the refrigerant circulation circuit 15.

[0076] In some embodiments of the present application, an inverter loop water pump 301 is provided on the liquid flow network outlet pipe branch 11, and a liquid flow network water pump 302 is provided on the pipeline connecting the first heat exchange chamber 32 and the liquid flow network outlet pipe main 12; a water tank-accumulator water pump 303 is provided on the pipeline connecting the accumulator outlet water channel and the water tank; and a resistance wire water channel water pump 304 is provided on the resistance wire heater-multi-cavity heat exchanger connecting water channel 29.

[0077] In some embodiments of the present application, an inverter outlet temperature sensor 401 is provided on the inverter side heat exchanger outlet water path 8; a battery module temperature sensor 402 is provided at the battery module 3; a cabin environment temperature sensor 403 is provided in the prefabricated cabin 1 of the energy storage power station; an accumulator outlet temperature sensor 404 is provided at the accumulator outlet water path 27; and a water tank temperature sensor 405 is provided at the water tank 31 for detecting the water temperature in the water tank 31.

[0078] In some embodiments of the present application, the thermal management system further includes a controller 101 , which is electrically connected to the above-mentioned valves, water pumps, and temperature sensors.

[0079] In other embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device is also provided, including mode 1: inverter waste heat recovery to heat the battery, specifically: the controller 101 determines the battery heating / cooling requirements, and when the temperature detected by the inverter water outlet temperature sensor 401 meets T1 = 35°C, the battery side water flow balancing valve 104, the inverter water channel switch valve 105 and the inverter water channel reversing valve 106 are opened to realize the water circulation direction from the inverter device 2 → the inverter water channel switch valve 105 → the battery side water channel flow balancing valve 104 → the battery liquid flow heat exchanger 4 → the inverter device 2, so as to realize the use of inverter heat for heating under low-temperature conditions of the battery, and realize the inverter heat exchange for battery heating by adjusting the speed of the inverter circuit water pump 301 to meet the low-temperature heating power requirement of the battery.

[0080] In some embodiments of the present application, in order to improve the battery heating efficiency, the controller 101 adjusts the speed of the inverter circuit water pump 301 to increase the water circulation flow rate to achieve the purpose of rapid heat exchange.

[0081] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with an inter-seasonal energy storage device includes mode 2: heating the battery during the inter-seasonal accumulator condensation heat release process. Specifically, the controller 101 determines the battery heating / cooling demand. When the temperature T2 detected by the accumulator outlet temperature sensor 404 satisfies 35°C < T2 < 60°C, the accumulator-multi-chamber heat exchanger water channel switch valve 212, the accumulator water channel switch valve 210, the multi-chamber heat exchanger-accumulator side water channel switch valve 205, and the accumulator outlet water channel switch valve 208 are opened, so that the water in the accumulator 23 circulates from the accumulator 23 → the accumulator outlet water channel 27 → the third heat exchange chamber 33 → the accumulator-multi-chamber heat exchanger connecting water channel 28 → the accumulator inlet water channel 26 → the accumulator 23. The coolant in the accumulator outlet water channel 27 exchanges heat with the coolant in the liquid flow pipe network in the multi-chamber heat exchanger 13. After the temperature of the coolant in the liquid flow pipe network rises, it heats the battery module 3.

[0082] In some embodiments of the present application, in order to accelerate the heat exchange rate of the liquid flow network to the battery, the rotation speed of the liquid flow network water pump 302 is increased, the flow rate of the liquid flow network is increased, and the rapid temperature rise of the battery is achieved; at the same time, in order to control the temperature consistency of multiple battery cells in different compartments, the controller 101 first adjusts the flow of the liquid flow network water inlet pipe branch 9, adjusts the liquid flow network branch flow balancing valve 103, and realizes flow distribution. Secondly, the water inlet flow distribution of the battery liquid flow heat exchanger 4 is adjusted, and the controller 101 regulates the opening of the battery side water flow balancing valve 104 to ensure that the monitoring temperature deviation of the battery module temperature sensor 402 is <2°C.

[0083] In some embodiments of the present application, in order to realize the heat release from the condensation of the phase change material filled in the accumulator 23 from liquid to solid, the accumulator 23 needs to be heated so that the filled phase change material accumulates heat and melts, and a resistance wire circuit is used for heating; the temperature T2 detected by the accumulator outlet temperature sensor 404 is monitored. When T2 is less than 35°C, the controller 101 controls the resistance wire heater 30 to open, and controls the accumulator outlet water circuit switch valve 208, the first accumulator-resistance wire side water circuit switch valve 209, the accumulator water circuit switch valve 210, and the second accumulator-resistance wire side water circuit switch valve 211 to open, and other valves are closed. At this time, the resistance wire heats the coolant, and the heated coolant circulates from the resistance wire heater-multi-cavity heat exchanger connecting water circuit 29 → accumulator-multi-cavity heat exchanger connecting water circuit 28 → accumulator 23 → resistance wire heater 30. The coolant carries the heat heated by the resistance wire and enters the accumulator 23 through circulation, providing heat for the melting of the accumulator phase change material.

[0084] In some embodiments of the present application, in order to realize the heat release from the liquid to the solid condensation of the phase change material filled in the accumulator 23, it is necessary to heat the accumulator 23 so that the filled phase change material can be melted by heat storage, and the photovoltaic collector 22 circuit is used for heating; the temperature T2 detected by the accumulator outlet temperature sensor 404 is monitored, and when T2 is less than 35°C, the temperature T3 detected by the water tank temperature sensor 405 is monitored, and when T3 satisfies T3 < 35°C, the hot water in the water tank 31 heated by the photovoltaic collector 22 is used to provide heat for the melting of the phase change material in the accumulator 23; the controller 101 controls the photovoltaic collector water circuit switch valve 20 2 is turned on, so that the photovoltaic collector 22 heats the hot water in the water tank 31; when T3 satisfies T3>60℃, the photovoltaic collector water circuit switch valve 202 is closed, the accumulator-water tank side water circuit switch valve 206 and the water tank-accumulator water circuit switch valve 207 are opened, and the accumulator water circuit switch valve 210 and the accumulator outlet water circuit switch valve 208 are closed; the coolant in the water tank 31 circulates through the water tank 31 → accumulator inlet water circuit 26 → accumulator 23 → accumulator outlet water circuit 27 → water tank 31. The coolant carries heat and enters the accumulator 23 through the circulation, providing heat for melting the accumulator phase change material.

[0085] In some embodiments of the present application, in order to accelerate the energy exchange efficiency from the water tank 31 to the accumulator 23 and accelerate the melting rate of the phase change material filled in the accumulator 23, the controller 101 controls the water tank-accumulator water pump 303 to increase its speed and increase the heat exchange circuit: water tank 31 → accumulator inlet water channel 26 → accumulator 23 → accumulator outlet water channel 27 → water tank 31 liquid flow rate, thereby achieving the purpose of increasing the melting rate of the phase change material.

[0086] In some embodiments of the present application, in order to realize the heat release from liquid to solid condensation of the phase change material filled in the accumulator 23, it is necessary to heat the accumulator 23 so that the filled phase change material accumulates heat and melts; a method of simultaneously heating the photovoltaic collector 22 circuit and the resistance wire circuit is adopted; the temperature T2 detected by the accumulator outlet temperature sensor 404 is monitored, and when its temperature T2 is less than 35°C, the water tank temperature sensor 405 set in the water tank 31 is monitored, and when its temperature T3 satisfies T3<35°C, the photovoltaic collector 22 is used to heat the water tank 31 to provide melting heat for the phase change material filled in the accumulator 23; the controller 101 controls the photovoltaic collector water circuit switch valve 202 to open, so that the photovoltaic collector 22 heats the water tank 31 with hot water; when T3 satisfies T3>60°C, the photovoltaic collector water circuit switch valve 202 is closed, and the accumulator-water tank side water circuit switch valve 20 is opened. 6. Water tank-accumulator waterway switch valve 207, accumulator outlet waterway switch valve 208, first accumulator-resistance wire side waterway switch valve 209, accumulator waterway switch valve 210, second accumulator-resistance wire side waterway switch valve 211; the coolant circulates via the water tank 31 → accumulator inlet waterway 26 → accumulator 23 → accumulator outlet waterway 27 → water tank 31. At the same time, the resistance wire heater 30 heats the coolant. The heated coolant circulates via the resistance wire heater 30 → second accumulator-resistance wire side waterway switch valve 211 → accumulator inlet waterway 26 → accumulator 23 → accumulator outlet waterway 27 → first accumulator-resistance wire side waterway switch valve 209 → resistance wire heater 30. The coolant carries heat from the resistance wire heater 30 and the photovoltaic collector 22 and enters the accumulator 23 through the circulation, providing heat for melting the accumulator phase change material.

[0087] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes mode three: photovoltaic collector hot water heats the battery, the photovoltaic collector 22 heats the coolant in the water tank 31, and when the water tank temperature sensor 405 detects that T3 reaches 60°C, the hot water in the multi-chamber heat exchanger 13 heats the liquid flow network of the energy storage battery module 3, thereby realizing low-temperature auxiliary heating of the energy storage battery module 3; the controller 101 controls the photovoltaic collector water circuit switch valve 202 to open, closes the accumulator-water tank side water circuit switch valve 206 and the water tank-accumulator water circuit switch valve 207, and when the water tank temperature sensor 405 detects that T3>60°C, closes the photovoltaic collector water circuit switch valve 202 and opens the accumulator-water tank side water circuit switch Valve 206 and water tank-accumulator water circuit switch valve 207 are opened, and the accumulator water circuit switch valve 210, the accumulator-multi-cavity heat exchanger water circuit switch valve 212, and the resistance wire-multi-cavity heat exchanger water circuit switch valve 213 are opened. The multi-cavity heat exchanger-accumulator side water circuit switch valve 205, the accumulator-water tank side water circuit switch valve 206, and the accumulator outlet water circuit switch valve 208 are opened, so that the coolant circulates in the pipeline according to the water tank 31 → water tank-accumulator water circuit switch valve 207 → accumulator-multi-cavity heat exchanger connecting water channel 28 → the third heat exchange chamber 33 → the multi-cavity heat exchanger-accumulator side water circuit switch valve 205 → the accumulator-water tank side water circuit switch valve 206 → the water tank 31. The photovoltaic collector 22 heats the coolant for the water tank 31 and heats the coolant for the energy storage liquid flow pipeline network.

[0088] In some embodiments of the present application, in order to accelerate the energy exchange efficiency from the water tank 31 to the multi-cavity heat exchanger 13, the controller 101 controls the water tank-accumulator water pump 303 to increase its speed and increase the circulating liquid flow rate. For the liquid flow network side, the heat exchange loop flow is increased to enhance the energy exchange in the multi-cavity heat exchanger 13. The controller 101 controls the speed of the liquid flow network water pump 302, increases its speed, and increases the liquid flow rate of the liquid flow network to achieve the purpose of rapid cooling of the battery module 3. At the same time, in order to control the temperature consistency of multiple battery cells in different compartments, the controller 101 first adjusts the flow of the liquid flow network water inlet branch 9 and adjusts the liquid flow network branch flow balancing valve 103 to achieve flow distribution. Secondly, it adjusts the water inlet flow distribution of the battery liquid flow heat exchanger 4. The controller 101 regulates the opening of the battery side water flow balancing valve 104 to ensure that the temperature deviation of the battery module 3 is <2°C.

[0089] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes mode four: heat pump system heating, specifically, the heat pump system realizes heat release of the refrigerant in the second heat exchange chamber 14 through the refrigerant circulation loop 15, and heat exchange with the first heat exchange chamber 32, and the coolant circulation achieves the purpose of heating the battery module 3; specifically: under the heating condition for the battery module 3, the heat pump system is in the heating mode, at this time the refrigerant is compressed by the compressor 18, passes through the first three-way valve 215, and enters the second heat exchange chamber 14 for condensation and heat release, and the first heat exchange chamber 32 absorbs the heat of the refrigerant to heat the battery module 3; then, the refrigerant is throttled and reduced in pressure through the second throttle valve 203 and enters the outdoor heat exchanger 16.

[0090] In some embodiments of the present application, when a heat pump system is used to heat the battery module 3, to increase the temperature rise rate of the battery module 3, the controller 101 controls the speed of the liquid flow network water pump 302, increasing its speed to increase the coolant flow rate in the liquid flow network. Secondly, the controller 101 controls the heat pump system compressor 18, increasing its speed to increase the heat supply of the heat pump system. Simultaneously, to maintain temperature consistency among multiple battery cells in different compartments, the controller 101 first adjusts the flow rate of the liquid flow network water inlet branch 9 and adjusts the liquid flow network branch flow balancing valve 103 to achieve flow distribution. Secondly, it adjusts the water inlet flow distribution of the battery liquid flow heat exchanger 4. The controller 101 regulates the opening of the battery-side water flow balancing valve 104 to ensure that the temperature deviation of the battery module 3 is less than 2°C.

[0091] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes mode five: heating by the resistance wire heater 30, specifically: when the battery module 3 is heated at a low temperature, the controller 101 controls the resistance wire heater 30 to turn on, opens the resistance wire-multi-cavity heat exchanger water circuit switch valve 213 and the multi-cavity heat exchanger-resistance wire side water circuit switch valve 204, and closes other valves to realize the circulation of coolant in the resistance wire heater 30 and the third heat exchange cavity 33, and the coolant heated by the resistance wire exchanges heat with the energy storage liquid flow pipeline network through the internal flow channel of the multi-cavity heat exchanger 13.

[0092] In some embodiments of the present application, when a heat pump system is used to provide heat for the battery module 3, in order to increase the temperature rise rate of the battery module 3, the controller 101 controls the rotation speed of the liquid flow network water pump 302, increases its rotation speed, and realizes an increase in the coolant flow rate of the liquid flow network; secondly, the controller 101 increases the number of resistor wires turned on, the power of a single resistor wire is 2kW or 4kW, and there are multiple resistor wires. By controlling the number of turned-on resistor wires, the heating power on the resistor wire side is increased, and the heating capacity is enhanced; in addition, the controller 101 controls the rotation speed of the resistor wire water circuit pump 304, increases the coolant flow in the circuit, and enhances heat exchange.

[0093] In some embodiments of the present application, a method for all-weather thermal management of an energy storage power station with an inter-seasonal energy storage device includes mode six: inter-seasonal accumulator melting to absorb heat and cool the battery, the phase change material filled in the accumulator 23 absorbs heat through solid-liquid phase change, cooling the coolant, and then the heat generated by the battery module 3 circulates through the energy storage liquid flow network coolant, and heat is exchanged through the multi-cavity heat exchanger 13 to achieve heat exchange with the coolant on the accumulator 23 side, thereby completing battery cooling; specifically: the controller 101 controls the accumulator-multi-cavity heat exchanger water circuit switch valve 212, the accumulator water circuit switch valve 210, the accumulator outlet water circuit switch valve 208, and the multi-cavity heat exchanger-accumulator side water circuit switch valve 205 to open, so that the coolant on the accumulator 23 side circulates in the accumulator 23 and the third heat exchange chamber 33, and the coolant carrying the heat generated by the battery enters the accumulator 23, realizes heat transfer to the phase change material, and the phase change material absorbs heat and melts, completing cooling of the battery module 3.

[0094] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes a natural cooling mode for the water tank, wherein the heat generated by the battery is circulated through the coolant of the energy storage liquid flow pipe network, and the heat exchange between the battery side coolant and the water tank side coolant is achieved through the multi-chamber heat exchanger 13 to complete the battery cooling; specifically, the controller 101 controls the multi-chamber heat exchanger-accumulator side waterway switch valve 205, the accumulator-water tank side waterway switch valve 206, the water tank-accumulator waterway switch valve 207, the accumulator outlet waterway switch valve 208, and the accumulator waterway switch valve 209. Valve 210 and the accumulator-multi-chamber heat exchanger water circuit switch valve 212 are opened, so that the coolant in the water tank 31 circulates through the water tank 31 → the water tank-accumulator water circuit switch valve 207 → the accumulator-multi-chamber heat exchanger connecting water circuit 28 → the third heat exchange chamber 33 → the multi-chamber heat exchanger-accumulator side water circuit switch valve 205 → the accumulator-water tank side water circuit switch valve 206. In the multi-chamber heat exchanger 13, the coolant entrained with the heat generated by the battery transfers the heat to the coolant on the water tank 31 side. The coolant temperature in the water tank 31 is reduced through natural cooling, thereby achieving the purpose of cooling the battery.

[0095] In some embodiments of the present application, in order to speed up the cooling rate of the battery module 3, the controller 101 regulates the liquid flow network to measure the coolant flow, regulates the speed of the liquid flow network water pump 302, increases the speed, and increases the coolant flow on the liquid flow network side to achieve accelerated battery cooling; the controller 101 increases the circulating coolant flow by increasing the speed of the water tank-accumulator water pump 303.

[0096] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes mode eight: a heat pump system cooling mode, in which the heat pump system cooling mode is used to realize evaporation and heat absorption of the refrigerant circulation loop 15 in the second heat exchange chamber 14, thereby cooling the energy storage liquid flow network coolant that carries heat generated by the battery module 3, thereby achieving the purpose of cooling the battery module 3; the heat pump system is composed of a compressor 18, a four-way valve 17, an outdoor heat exchanger 16, a first throttle valve 34, and an indoor heat exchanger 19, which together form a closed system of the refrigerant circulation loop 15; under the condition of cooling the battery, the heat pump system is in cooling mode, the refrigerant is compressed by the compressor 18, enters the outdoor heat exchanger 16 through the four-way valve 17 for condensation and heat release, and is throttled and reduced in pressure by the second throttle valve 203 and enters the second heat exchange chamber 14. At this time, it absorbs the energy storage liquid flow network coolant that carries heat generated by the battery, and the refrigerant vaporizes and absorbs heat, thereby completing the cooling of the battery side coolant.

[0097] In some embodiments of the present application, in order to speed up the cooling rate of the battery module 3, the controller 101 regulates the liquid flow network to measure the coolant flow, regulates the speed of the liquid flow network water pump 302, increases the speed, and increases the coolant flow on the liquid flow network side to accelerate the cooling of the battery; the controller 101 increases the cooling capacity of the heat pump system by regulating the speed of the compressor 18 and the opening of the second throttle valve 203.

[0098] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes mode nine: a heat pump system air environment heating mode, which uses the heat pump system heating mode to heat the air environment on the battery module 3 side; the heat pump system is in a heating mode, at which time the refrigerant is compressed by the compressor 18, and is diverted through the four-way valve 17 to enter the indoor heat exchanger 19 for condensation and heat release. At this time, the air environment on the battery side is heated, and after throttling and reducing the pressure by the first throttle valve 34, it enters the outdoor heat exchanger 16, and the refrigerant vaporizes and absorbs heat, thereby completing the cycle; the air heating power of the heat pump system is achieved by regulating the speed of the indoor heat exchanger fan 21 through the controller 101; the controller 101 increases the heating power of the indoor heat exchanger 19 by regulating the speed of the heat pump system compressor 18, and can also achieve this by regulating the opening of the first throttle valve 34 and the speed of the outdoor heat exchanger fan 20.

[0099] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-seasonal energy storage device includes mode ten: a heat pump system air environment cooling mode. When cooling the battery, the heat pump system is in cooling mode. At this time, the refrigerant passes through the compressor 18 and enters the outdoor heat exchanger 16 for condensation and heat release, and discharges the heat to the outdoor environment. Then, the refrigerant passes through the first throttle valve 34 for throttling and pressure reduction, and then enters the indoor heat exchanger 19. The refrigerant vaporizes and absorbs heat to achieve cooling of the air environment, thereby completing the cycle.

[0100] In some embodiments of the present application, the thermal management method of the present application includes the following modes:

[0101] Mode 1: inverter waste heat recovery to heat the battery, mode 2: cross-seasonal accumulator condensation heat release process to heat the battery, mode 3: photovoltaic collector hot water to heat the battery, mode 4: heat pump system heating mode, mode 5: resistance wire electric heating, mode 6: cross-seasonal accumulator melting heat absorption to cool the battery, mode 7: water tank natural cooling mode, mode 8: heat pump system cooling mode, mode 9: heat pump system air environment heating mode, mode 10: heat pump system air environment cooling mode.

[0102] In some embodiments of the present application, the thermal management method of the present application can freely combine modes 1 to 5 when heating the battery at low temperature, and modes 6 to 8 when cooling the battery at high temperature.

[0103] In some embodiments of the present application, the heat pump system can also achieve cabin environment air humidity control through fresh air heat exchange.

[0104] In some embodiments of the present application, the heating and cooling of the battery module 3 are achieved by regulating the circulation flow of the coolant in the energy storage liquid flow network, that is, the controller 101 controls the speed of the water pump on the liquid flow network side, increases the speed, and increases the flow rate, so as to achieve the purpose of rapid heating and cooling of the battery; the battery heating and cooling need to pay attention to temperature consistency. The controller 101 adopts a double-layer strategy in the battery temperature equalization strategy, with the temperature difference between the battery modules 3 <2°C as the goal, and adjusts the valve opening of each battery compartment liquid flow main pipe. Secondly, the liquid flow network branch flow balancing valve 103 is adjusted to regulate the inlet flow of the battery module 3. When the temperature difference between the battery modules is close, the flow rate is guaranteed to remain unchanged. When the temperature difference between the battery modules 3 is large, the flow rate increases on the high temperature side of the battery module 3 to accelerate cooling. The valve on the low temperature side of the battery module 3 is closed and the flow rate is reduced to reduce the temperature difference between different battery modules.

[0105] In some embodiments of the present application, when a heat pump system is used for heating or cooling, the controller 101 increases the heating / cooling capacity by controlling the speed of the compressor 18 and the switching of the four-way valve 17; for heating and cooling control of the prefabricated cabin 1 of the energy storage power station, the controller 101 increases the heating / cooling capacity of the indoor heat exchanger by controlling the speed of the indoor heat exchanger fan, the speed of the compressor 18, and the throttle opening of the first throttle valve 34 and the second throttle valve 203; when heating or cooling the air in the prefabricated cabin 1 of the energy storage power station, the controller 101 can also regulate the humidity.

[0106] This application realizes the heating and cooling functions of the DC high-voltage battery modules in the prefabricated cabin and the regulation of the air environment temperature and humidity through the joint operation of the heat pump system, photovoltaic collector, accumulator and resistance wire heating system. In addition, it is designed for AC / DC integration, and uses the liquid flow pipe network to form integrated thermal management on the AC and DC sides. At the same time, it uses the heat of the inverter to provide a heating source for the low-temperature working conditions of the battery. This application effectively guarantees the requirements of battery heating / cooling and temperature consistency control under all climate conditions; at the same time, it can realize cross-seasonal energy storage and waste heat utilization, avoid energy loss, improve energy utilization efficiency, and achieve the purpose of reducing thermal management energy consumption.

[0107] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the appended claims.

Claims

1. A full-climate thermal management system for an energy storage power station with a cross-season energy storage device, characterized in that: include: a refrigerant circulation circuit, the refrigerant circulation circuit sequentially connecting a compressor, a four-way valve, an indoor heat exchanger, a first throttle valve, and an outdoor heat exchanger; a circulating water circuit, the circulating water circuit comprising a liquid flow pipe network inlet branch, a liquid flow pipe network inlet main trunk, a liquid flow pipe network outlet branch, and a liquid flow pipe network outlet main trunk; a prefabricated energy storage power station cabin, one end of which is connected to the liquid flow pipe network inlet main trunk via the liquid flow pipe network inlet branch and the other end of which is connected to the liquid flow pipe network outlet main trunk via the liquid flow pipe network outlet branch; an inverter device and battery modules are distributed within the prefabricated energy storage power station cabin; a multi-chamber heat exchanger, which includes at least a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber, wherein one end of the first heat exchange chamber is connected to the main trunk of the water inlet pipe of the liquid flow pipe network, and the other end is connected to the main trunk of the water outlet pipe of the liquid flow pipe network; one end of the second heat exchange chamber is connected to the refrigerant circulation loop between the four-way valve and the indoor heat exchanger through a first refrigerant pipe, and the other end is connected to the outdoor heat exchanger through a second refrigerant pipe, and a second throttle valve is also provided on the second refrigerant pipe between the second heat exchange chamber and the outdoor heat exchanger; a water storage tank, a first end of which is connected to the main trunk of the water outlet pipe of the liquid flow pipe network, and a second end is connected to the photovoltaic collector through a water channel; an accumulator, one end of which is connected to one end of the third heat exchange chamber through the accumulator-multi-chamber heat exchanger connecting water channel, and the other end is connected to the third end of the water storage tank through the accumulator outlet water channel; a switch valve group is used to control the on-off of the pipeline; The circulating water loop also includes a resistance wire heater-multi-cavity heat exchanger connecting water channel, one end of which is connected to the accumulator-multi-cavity heat exchanger connecting water channel, and the other end is connected to the accumulator outlet water channel. The resistance wire heater is arranged on the resistance wire heater-multi-cavity heat exchanger connecting water channel.

2. The all-climate thermal management system for an energy storage power station with a cross-season energy storage device according to claim 1, characterized in that: The inverter device and the battery module are arranged in an integrated manner, which can form integrated thermal management through the liquid flow pipe network and simultaneously realize the recovery of inverter waste heat to heat the battery module.

3. The all-climate thermal management system for an energy storage power station with a cross-season energy storage device according to claim 1, characterized in that: The prefabricated cabin of the energy storage power station is equipped with an inverter device, a battery module and a battery liquid flow heat exchanger; the battery liquid flow heat exchanger is located below the battery module, one end of the inverter device is connected to the liquid flow pipe network water inlet branch through the inverter side heat exchanger inlet water channel, and the other end is connected to the liquid flow pipe network water outlet branch through the inverter side heat exchanger outlet water channel; one end of the battery liquid flow heat exchanger is connected to the liquid flow pipe network water inlet branch through the battery side heat exchanger inlet water channel, and the other end is connected to the liquid flow pipe network water outlet branch through the battery side heat exchanger outlet water channel.

4. The all-climate thermal management system for an energy storage power station with a cross-season energy storage device according to claim 1, characterized in that: The accumulator includes a phase change material filling cavity and ribbed heat exchange fins. The ribbed heat exchange fins are passed through the accumulator inlet water channel and the accumulator outlet water channel, and the coolant in the water channel exchanges heat with the phase change material. The phase change material in the phase change material filling cavity is paraffin, crystalline hydrated salt, and formic acid, and the phase change temperature range is 35-60°C. The phase change material filling cavity is filled with a single material or with different phase change materials in different partitions. When different phase change materials are filled in different partitions, the material with a high phase change temperature is filled near the water inlet side, and the material with a low phase change temperature is filled near the water outlet side, with the purpose of using temperature difference to drive heat exchange.

5. The all-climate thermal management system for an energy storage power station with a cross-season energy storage device according to claim 1, characterized in that: The switch valve group includes: a liquid flow network exhaust valve arranged upstream of the main water inlet pipe of the liquid flow network; a liquid flow network branch flow balancing valve arranged upstream of the liquid flow network branch inlet pipe, used to control the water flow entering the inverter device and the battery liquid flow heat exchanger; a battery side water flow balancing valve arranged on the inlet water path of the battery side heat exchanger; an inverter water path switch valve arranged on the inlet water path of the inverter side heat exchanger; an inverter water path reversing valve arranged on the outlet water path of the liquid flow network branch. Valve; a liquid flow pipe network return water main pipe switch valve set on the liquid flow pipe network outlet main pipe; a photovoltaic collector water circuit switch valve, used to control the photovoltaic collector water inlet or outlet; the resistance wire heater-multi-cavity heat exchanger connecting water circuit is provided with a multi-cavity heat exchanger-resistance wire side water circuit switch valve; a multi-cavity heat exchanger-accumulator side water circuit switch valve is provided on the pipeline connecting the multi-cavity heat exchanger and the accumulator outlet water circuit; a accumulator outlet is provided on the pipeline connecting the accumulator water outlet and the third end of the water tank. Accumulator-water tank side water circuit switching valve; a water tank-accumulator water circuit switching valve is provided on the pipeline connecting the accumulator inlet water circuit and the water tank; an accumulator outlet water circuit switching valve is provided on the accumulator outlet pipeline; a first accumulator-resistance wire side water circuit switching valve is provided between the water circuit connecting the accumulator and the resistance wire heater; an accumulator water circuit switching valve is provided at the water inlet of the accumulator; a second accumulator-resistance wire side water circuit switching valve is provided on the water circuit connecting the resistance wire heater-multi-cavity heat exchanger water circuit and the accumulator inlet water circuit; an accumulator-multi-cavity heat exchanger water circuit switching valve is provided on the water circuit on the side of the accumulator inlet water circuit away from the accumulator; a resistance wire-multi-cavity heat exchanger water circuit switching valve is provided at the resistance wire heater-multi-cavity heat exchanger water circuit connecting the resistance wire heater away from the resistance wire heater; a multi-cavity heat exchanger-refrigerant circuit switching valve is provided on the first refrigerant pipeline; a first three-way valve is provided at the intersection of the first refrigerant pipeline and the refrigerant circulation circuit.

6. A full-climate thermal management system for an energy storage power station with a cross-season energy storage device according to any one of claims 1 to 5, characterized in that: An inverter loop water pump is provided on the liquid flow network outlet pipe branch, and a liquid flow network water pump is provided on the pipe connecting the first heat exchange chamber and the liquid flow network outlet pipe main pipe; a water tank-accumulator water pump is provided on the pipe connecting the accumulator outlet water channel and the water tank; a resistance wire water channel pump is provided on the resistance wire heater-multi-cavity heat exchanger connecting water channel; an inverter water outlet temperature sensor is provided on the inverter side heat exchanger outlet water channel; a battery module temperature sensor is provided at the battery module; a cabin ambient temperature sensor is provided in the prefabricated cabin of the energy storage power station; an accumulator outlet temperature sensor is provided on the accumulator outlet water channel; and a water tank temperature sensor is provided at the water tank for detecting the water temperature in the water tank.

7. A full-climate thermal management method for an energy storage power station with a cross-season energy storage device, characterized in that: Using the thermal management system described in claim 6, the thermal management method includes: Mode 1, inverter waste heat recovery heating battery, Mode 2, cross-season accumulator condensation heat release process heating battery, Mode 3, photovoltaic collector hot water heating battery, Mode 4, heat pump system heating, Mode 5, resistance wire electric heating, Mode 6, cross-season accumulator melting heat absorption cooling battery, Mode 7, water tank natural cooling mode, Mode 8, heat pump system cooling mode, Mode 9, heat pump system air environment heating mode, Mode 10, heat pump system air environment cooling mode; Mode 1: Inverter waste heat is recovered to heat the battery module. Specifically, the controller determines the battery heating / cooling requirements. When the temperature detected by the inverter water outlet temperature sensor meets the first condition, that is, reaches T1, the controller controls the on-off valve group to circulate water from the inverter device to the battery liquid flow heat exchanger and then to the inverter device. Inverter heat is used for heating. By adjusting the speed of the inverter circuit water pump, the inverter heat is exchanged for battery heating to meet the battery's low-temperature heating power requirements. Mode 2: The cross-seasonal accumulator condensation heat release process heats the battery. Specifically, the controller determines the battery heating / cooling needs. When the temperature T2 detected by the accumulator outlet temperature sensor meets the second condition, it controls the on-off valve group to circulate the water in the accumulator from the accumulator → accumulator outlet waterway → the third heat exchange chamber → the accumulator-multi-chamber heat exchanger connecting waterway → the accumulator inlet waterway → the accumulator. The coolant in the accumulator outlet waterway exchanges heat with the coolant in the liquid flow pipe network in the multi-chamber heat exchanger. When the temperature of the coolant in the liquid flow pipe network rises, it heats the battery module. Mode 3: The photovoltaic collector uses hot water to heat the battery, and the photovoltaic collector heats the coolant in the water tank. When the water tank temperature sensor detects that T3 meets the third condition, the hot water in the multi-chamber heat exchanger heats the liquid flow network of the energy storage battery module. The opening of the switch valve group is controlled to allow the coolant to circulate in the pipeline along the following lines: water tank → accumulator-multi-chamber heat exchanger connecting water path → third heat exchange chamber → accumulator → water tank. The photovoltaic collector heats the coolant in the water tank and heats the coolant in the energy storage liquid flow network. Mode 4: Heat pump system heating, specifically, the heat pump system uses the refrigerant circulation loop to realize the heat release of the refrigerant in the second heat exchange chamber, and through heat exchange with the first heat exchange chamber, the coolant circulates to achieve the purpose of heating the battery module; specifically: under the condition of heating the battery module, the heat pump system is in the heating mode. At this time, the refrigerant is compressed by the compressor, passes through the first three-way valve, and enters the second heat exchange chamber for condensation and heat release. The first heat exchange chamber absorbs the heat of the refrigerant to heat the battery module; then, the refrigerant is throttled and reduced in pressure through the second throttle valve and enters the outdoor heat exchanger; Mode 5: Resistance wire heater heating, specifically: when the battery module is heated at low temperature, the controller controls the resistance wire heater to turn on, opens the resistance wire-multi-chamber heat exchanger water circuit switch valve and the multi-chamber heat exchanger-resistance wire side water circuit switch valve, and realizes the circulation of coolant in the resistance wire heater and the third heat exchange chamber. The coolant heated by the resistance wire exchanges heat with the energy storage liquid flow network through the internal flow channel of the multi-chamber heat exchanger; Mode 6: Inter-seasonal accumulator melting and heat absorption to cool the battery. The phase change material filled in the accumulator absorbs heat through solid-liquid phase transition, cooling the coolant. Heat generated by the battery module then circulates through the energy storage liquid flow network coolant, and then exchanges heat with the accumulator-side coolant through the multi-chamber heat exchanger, thereby completing battery cooling. Specifically, the opening and closing of the on-off valve group is controlled to circulate the accumulator-side coolant in the accumulator and the third heat exchange chamber. The coolant carrying the heat generated by the battery enters the accumulator, transferring heat to the phase change material, which absorbs heat and melts, completing the cooling of the battery module.Mode seven: natural cooling mode of the water tank, the heat generated by the battery is circulated through the coolant of the energy storage liquid flow pipe network, and the heat exchange between the coolant on the battery side and the coolant on the water tank side is achieved through the multi-cavity heat exchanger to complete the battery cooling; in the multi-cavity heat exchanger, the coolant entrained with the heat generated by the battery transfers the heat to the coolant on the water tank side, and the coolant temperature in the water tank is reduced through natural cooling, thereby achieving the purpose of cooling the battery; Mode eight: Refrigeration mode of the heat pump system, when cooling the battery, the heat pump system is in refrigeration mode, the refrigerant is compressed by the compressor, enters the outdoor heat exchanger through the four-way valve for condensation and heat release, and the second throttle valve throttles and reduces the pressure, and enters the second heat exchange chamber, at this time absorbing the coolant of the energy storage liquid flow pipe network entrained with the heat generated by the battery, and the refrigerant vaporizes and absorbs heat, thereby completing the cooling of the coolant on the battery side; Mode 9: Heat pump system air environment heating mode. The heat pump system is in heating mode. At this time, the refrigerant is compressed by the compressor, diverted by the four-way valve, and enters the indoor heat exchanger for condensation and heat release. At this time, it heats the air environment on the battery side. After throttling and reducing the pressure by the first throttle valve, it enters the outdoor heat exchanger. The refrigerant vaporizes and absorbs heat, thus completing the cycle. Mode 10: Heat pump system air environment cooling mode. Under the condition of cooling the battery, the heat pump system is in cooling mode. At this time, the refrigerant passes through the compressor and enters the outdoor heat exchanger. It condenses and releases heat to the outdoor environment. Then, after throttling and reducing the pressure by the first throttle valve, the refrigerant enters the indoor heat exchanger. The refrigerant vaporizes and absorbs heat, achieving cooling of the air environment, thus completing the cycle.

8. The all-climate thermal management method for an energy storage power station with a cross-season energy storage device according to claim 7, characterized in that: When heating the battery, modes one to five can be freely combined; when cooling the battery, modes six to eight can be freely combined.

9. The all-climate thermal management method for an energy storage power station with a cross-season energy storage device according to claim 7, characterized in that: When using a heat pump system for heating or cooling, the controller increases the heating / cooling capacity by controlling the compressor speed and the switching of the four-way valve. For heating and cooling control of the prefabricated cabin of the energy storage power station, the controller increases the heating / cooling capacity of the indoor heat exchanger by controlling the indoor heat exchanger fan speed, the compressor speed, and the opening of the first throttle valve and the second throttle valve. When heating or cooling the air in the prefabricated cabin of the energy storage power station, the controller can adjust the humidity.

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