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

Abstract

The invention relates to the field of battery thermal safety management, in particular to an all-weather thermal management system and method for an energy storage power station with a cross-seasonal energy storage device. Through combined operation of the refrigerant circulation loop, the circulating water loop, the switch valve group, the multi-cavity heat exchanger, the water storage tank, the energy accumulator, the photovoltaic heat collector and the resistance wire heater, heating or cooling of the battery module in the prefabricated cabin of the energy storage power station is achieved. According to the invention, the requirements of battery heating / cooling and temperature consistency control under all-weather working conditions are effectively ensured; meanwhile, cross-seasonal energy storage and waste heat utilization can be achieved, energy loss is avoided, the energy utilization efficiency is improved, and the purpose of reducing heat management energy consumption is achieved.

Description

Technical Field

[0001] This application relates to the field of battery thermal safety management, and particularly to an all-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 requirements of the "Technical Specification for Prefabricated Cabin Lithium-Ion Battery Energy Storage System GB / T44026-2024", an increase in the energy consumption of the energy storage thermal management unit will reduce the operating efficiency of the energy storage system. Therefore, the energy storage thermal management unit not only needs to meet the cold (heat) demand of the energy storage system, but also needs to reduce the operating power consumption to meet the efficient operation of the system. Energy consumption is an important indicator for measuring the operating cost of the thermal management system of an energy storage power station. A low-energy consumption system can not only reduce the operating cost, but also improve the energy efficiency ratio of the overall energy storage system and optimize the economy.

[0003] Currently, most energy storage thermal management adopts variable frequency control of thermal management units (compressors, fans, water pumps) to reduce system energy consumption. Chinese application CN202410348849.1 mentions that the energy storage thermal management system uses a DC variable frequency compressor refrigeration cycle to work, achieving automatic control and energy saving. Chinese application CN202311692890.2 uses optical fiber temperature measurement, with a flexible and simple layout method, which can accurately collect the temperature data of the battery module 3; the liquid cooling system executes the temperature variable frequency adjustment instruction to adjust the overall temperature of the battery cluster and / or the local temperature of a single battery module 3, so that the temperature of the battery module 3 is adjusted to the preset temperature, ensuring the temperature consistency of all battery modules 3.

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

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

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

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

[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: A refrigerant circulation loop, which is sequentially connected to a compressor, a four-way valve, an indoor heat exchanger, a first throttle valve, and an outdoor heat exchanger; A circulating water loop, which includes a liquid flow network inlet pipe branch, a liquid flow network inlet pipe main trunk, a liquid flow network outlet pipe branch, and a liquid flow network outlet pipe main trunk; An energy storage power station prefabricated cabin, one end of which is connected to the liquid flow network inlet pipe main trunk through the liquid flow network inlet pipe branch, and the other end is connected to the liquid flow network outlet pipe main trunk through the liquid flow network outlet pipe branch. The inverter device and the battery module are distributed in the energy storage power station prefabricated cabin; A multi-chamber heat exchanger, which at least includes 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 the liquid flow network inlet pipe main trunk, and the other end is connected to the liquid flow network outlet pipe main trunk; 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 pipeline, and the other end is connected to the outdoor heat exchanger through a second refrigerant pipeline. A second throttle valve is also provided on the second refrigerant pipeline between the second heat exchange chamber and the outdoor heat exchanger; A water storage tank, its first end is connected to the liquid flow network outlet pipe main trunk, and its second end is connected to the photovoltaic collector through a water circuit; An accumulator, one end of which is connected to one end of the third heat exchange chamber through an accumulator-multi-chamber heat exchanger connecting water circuit, and the other end is connected to the third end of the water storage tank through an accumulator outlet water circuit; A switching valve group for controlling the on / off of the pipeline; The circulating water loop further includes a resistance wire heater-multi-chamber heat exchanger connecting water circuit, one end of which is connected to the accumulator-multi-chamber heat exchanger connecting water circuit, and the other end is connected to the accumulator outlet water circuit. The resistance wire heater is arranged on the resistance wire heater-multi-chamber heat exchanger connecting water circuit.

[0009] In some embodiments of the present application, the circulating water loop further includes a resistance wire heater-multi-chamber heat exchanger connecting water circuit, one end of which is connected to the accumulator-multi-chamber heat exchanger connecting water circuit, and the other end is connected to the accumulator outlet water circuit. The resistance wire heater is arranged on the resistance wire heater-multi-chamber heat exchanger connecting water circuit.

[0010] In some embodiments of the present application, an inverter device, a battery module, and a battery liquid flow heat exchanger are arranged 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 communicated with the inlet water branch of the liquid flow pipe network through the inlet water path of the inverter side heat exchanger, and the other end is communicated with the outlet water branch of the liquid flow pipe network through the outlet water path of the inverter side heat exchanger; one end of the battery liquid flow heat exchanger is communicated with the inlet water branch of the liquid flow pipe network through the inlet water path of the battery side heat exchanger, and the other end is communicated with the outlet water branch of the liquid flow pipe network through the outlet water path of the battery side heat exchanger.

[0011] In some embodiments of the present application, the accumulator includes a phase change material filling cavity and ribbed heat exchange fins. The inlet water path and the outlet water path of the accumulator penetrate through the ribbed heat exchange fins, and the coolant in the water path exchanges heat with the phase change material; 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; The phase change material filling cavity is filled with a single material or different phase change materials are filled in different zones; among them, when different phase change materials are filled in different zones, the material with a higher phase change temperature is filled near the water inlet side, and the material with a lower phase change temperature is filled near the water outlet side, aiming to drive heat exchange by using the temperature difference.

[0012] In some embodiments of the present application, the switching valve group includes: a liquid flow network exhaust valve disposed upstream of the main header of the inlet pipe of the liquid flow network; a liquid flow network branch flow balance valve disposed upstream of the branch of the inlet pipe of the liquid flow network, for controlling the water flow entering the inverter device and the battery liquid heat exchanger; a battery-side waterway flow balance valve disposed on the inlet waterway of the battery-side heat exchanger; an inverter waterway switching valve disposed on the inlet waterway of the inverter-side heat exchanger; an inverter waterway reversing valve disposed on the branch of the outlet pipe of the liquid flow network; a liquid flow network return main header switching valve disposed on the main header of the outlet pipe of the liquid flow network; a photovoltaic collector waterway switching valve for controlling the water inlet or drainage of the photovoltaic collector; a multi-chamber heat exchanger-resistance wire side water circuit switching valve is provided on the connecting waterway of the resistance wire heater-multi-chamber heat exchanger; a multi-chamber heat exchanger-accumulator side waterway switching valve is provided on the pipeline connecting the multi-chamber heat exchanger and the outlet waterway of the accumulator; an accumulator-accumulator tank side waterway switching valve is provided on the pipeline connecting the outlet of the accumulator and the third end of the accumulator tank; a accumulator tank-accumulator waterway switching valve is provided on the pipeline connecting the inlet waterway of the accumulator and the accumulator tank; an accumulator outlet waterway switching valve is provided on the outlet pipeline of the accumulator; a first accumulator-resistance wire side waterway switching valve is provided between the waterways connecting the accumulator and the resistance wire heater; an accumulator waterway switching valve is provided at the water inlet of the accumulator; a second accumulator-resistance wire side waterway switching valve is provided on the waterway connecting the connecting waterway of the resistance wire heater-multi-chamber heat exchanger and the inlet waterway of the accumulator; an accumulator-multi-chamber heat exchanger waterway switching valve is provided on the waterway on the side of the inlet waterway of the accumulator away from the accumulator; a resistance wire-multi-chamber heat exchanger waterway switching valve is provided at the place where the connecting waterway of the resistance wire heater-multi-chamber heat exchanger is away from the resistance wire heater; a multi-chamber 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.

[0013] In some embodiments of the present application, an inverter loop water pump is provided on the branch of the outlet pipe of the liquid flow network, and a liquid flow network water pump is provided on the pipeline connecting the first heat exchange chamber and the main header of the outlet pipe of the liquid flow network; a accumulator tank-accumulator water pump is provided on the pipeline connecting the outlet waterway of the accumulator and the accumulator tank; a resistance wire waterway water pump is provided on the connecting waterway of the resistance wire heater-multi-chamber heat exchanger. In some embodiments of the present application, an inverter outlet temperature sensor is provided on the outlet waterway of the inverter-side heat exchanger; 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 outlet waterway of the accumulator; a accumulator tank temperature sensor is provided at the accumulator tank for detecting the water temperature in the accumulator tank.

[0014] In some other embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device is provided. Using the thermal management system described in the above embodiments, the thermal management method includes: Mode 1: Recycling the waste heat of the inverter to heat the battery; Mode 2: Heating the battery during the condensation heat release process of the cross-season energy storage device; Mode 3: Heating the battery with hot water from the photovoltaic collector; Mode 4: Heating by the heat pump system; Mode 5: Electric heating with a resistance wire; Mode 6: Cooling the battery by the melting heat absorption of the cross-season energy storage device; Mode 7: Natural cooling mode of the water storage tank; Mode 8: Refrigeration mode of the heat pump system; Mode 9: Air environment heating mode of the heat pump system; Mode 10: Air environment refrigeration mode of the heat pump system.

[0015] In some embodiments of the present application, in Mode 1: Recycling the waste heat of the inverter to heat the battery module, specifically: The controller determines the battery heating / cooling requirement. When the temperature detected by the temperature sensor at the outlet of the inverter meets the first condition, that is, when it reaches T1, the switch valve group is controlled to make the water circulation direction be from the inverter device → the battery liquid flow heat exchanger → the inverter device, and the inverter heat is used for heating. By adjusting the rotational speed of the water pump in the inverter loop, the heat exchange of the inverter heat is used for battery heating to meet the low-temperature heating power requirement of the battery.

[0016] In some embodiments of the present application, in Mode 2: Heating the battery during the condensation heat release process of the cross-season energy storage device, specifically: The controller determines the battery heating / cooling requirement. When the temperature T2 detected by the temperature sensor at the outlet of the energy storage device meets the second condition, the switch valve group is controlled to make the water in the energy storage device circulate from the energy storage device → the waterway at the outlet of the energy storage device → the third heat exchange chamber → the connecting waterway of the energy storage device - multi-chamber heat exchanger → the waterway at the inlet of the energy storage device → the energy storage device, so that the coolant in the waterway at the outlet of the energy storage device exchanges heat with the coolant in the liquid flow pipe network in the multi-chamber heat exchanger, and the temperature of the coolant in the liquid flow pipe network rises to heat the battery module.

[0017] In some embodiments of the present application, in Mode 3: Heating the battery with hot water from the photovoltaic collector, the photovoltaic collector heats the coolant in the water storage tank. When the temperature T3 detected by the temperature sensor of the water storage tank meets the third condition, the hot water heats the liquid flow pipe network of the energy storage battery module in the multi-chamber heat exchanger; the opening of the switch valve group is controlled to make the coolant circulate in the pipeline in the order of the water storage tank → the connecting waterway of the energy storage device - multi-chamber heat exchanger → the third heat exchange chamber → the energy storage device → the water storage tank. The photovoltaic collector heats the coolant in the water storage tank to heat the coolant in the energy storage liquid flow pipe network.

[0018] In some embodiments of the present application, Mode Four: Heat supply by the heat pump system. Specifically, the heat pump system realizes heat release of the refrigerant in the second heat exchange chamber through the refrigerant circulation loop, and through heat exchange with the first heat exchange chamber, the coolant circulation is achieved to heat the battery module. Specifically: Under the heating condition of the battery module, the heat pump system is in the heat supply mode. At this time, the refrigerant is compressed by the compressor, enters the second heat exchange chamber through the first three-way valve for condensation and heat release, and the first heat exchange chamber absorbs the heat of the refrigerant to heat the battery module. Subsequently, the refrigerant is throttled and depressurized by the second throttle valve and enters the outdoor heat exchanger.

[0019] In some embodiments of the present application, Mode Five: Heating by the resistance wire heater. Specifically: When the battery module is heated at low temperature, the controller controls the resistance wire heater to turn on, and the waterway switch valve of the resistance wire - multi - chamber heat exchanger and the water circuit switch valve of the multi - chamber heat exchanger - resistance wire side are turned on to realize the circulation of the 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 channels of the multi - chamber heat exchanger.

[0020] In some embodiments of the present application, Mode Six: The seasonal heat accumulator melts and absorbs heat to cool the battery. The heat accumulator is filled with a phase - change material that absorbs heat through solid - liquid phase change to cool the coolant, and then the heat generated by the battery module is exchanged with the coolant on the heat accumulator side through the coolant circulation of the energy storage liquid flow network and heat exchange through the multi - chamber heat exchanger, thus completing the cooling of the battery. Specifically: By controlling the opening and closing of the switch valve group, the coolant on the heat accumulator side circulates in the heat accumulator and the third heat exchange chamber. The coolant carrying the heat generated by the battery enters the heat accumulator, and the heat is transferred to the phase - change material. The phase - change material absorbs heat and melts, completing the cooling of the battery module.

[0021] In some embodiments of the present application, Mode Seven: Natural cooling mode of the water storage tank. The heat generated by the battery is exchanged with the coolant on the water storage tank side through the coolant circulation of the energy storage liquid flow network and heat exchange through the multi - chamber heat exchanger to complete the battery cooling; in the multi - chamber heat exchanger, the coolant carrying the heat generated by the battery transfers the heat to the coolant on the water storage tank side, and the temperature of the coolant in the water storage tank is reduced through natural cooling to achieve the purpose of cooling the battery.

[0022] In some embodiments of the present application, Mode Eight: Refrigeration mode of the heat pump system. Under the cooling condition of the battery, the heat pump system is in the refrigeration mode. The refrigerant is compressed by the compressor, enters the outdoor heat exchanger through the four - way valve for condensation and heat release, is throttled and depressurized by the second throttle valve, and enters the second heat exchange chamber. At this time, it absorbs the coolant of the energy storage liquid flow network carrying the heat generated by the battery, and the refrigerant vaporizes and absorbs heat to complete the cooling of the coolant on the battery side.

[0023] In some embodiments of the present application, Mode Nine: Air Environment Heating Mode of the Heat Pump System. The heat pump system is in the heating mode. At this time, the refrigerant undergoes the compression process by the compressor, passes through the four-way valve for commutation, and enters the indoor heat exchanger for condensation and heat release. At this time, the air environment on the battery side is heated. After throttling and pressure reduction by the first throttle valve, it enters the outdoor heat exchanger, and the refrigerant vaporizes and absorbs heat to complete the cycle.

[0024] In some embodiments of the present application, Mode Ten: Air Environment Cooling Mode of the Heat Pump System. Under the condition of cooling the battery, the heat pump system is in the cooling mode. At this time, the refrigerant enters the outdoor heat exchanger through the compressor for condensation and heat release, and discharges the heat to the outdoor environment. Then, after throttling and pressure reduction by the first throttle valve, the refrigerant enters the indoor heat exchanger, and the refrigerant vaporizes and absorbs heat to achieve cooling of the air environment to complete the cycle.

[0025] 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.

[0026] In some embodiments of the present application, when using the heat pump system for heating or cooling, the controller increases the heating / cooling capacity by controlling the compressor speed and the four-way valve switching; for the 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 speed of the indoor heat exchanger fan, the compressor speed, and the opening degrees 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 regulate the humidity.

[0027] In some embodiments of the present application, the thermal management system further includes a controller, and the controller is electrically connected to the above-mentioned valves, water pumps, and temperature sensors.

[0028] In some embodiments of the present application, in order to improve the battery heating efficiency, the controller adjusts the speed of the inverter loop water pump to increase the water circulation flow rate to achieve the purpose of rapid heat exchange.

[0029] In some embodiments of the present application, in order to accelerate the heat exchange rate of the liquid flow pipe network to the battery, increase the speed of the liquid flow pipe network water pump and the liquid flow pipe network flow rate to achieve rapid temperature rise of the battery; at the same time, in order to control the temperature consistency of multiple battery monomers in different cabins, the controller first adjusts the flow rate of the water inlet branch of the liquid flow pipe network, adjusts the flow balance valve of the liquid flow pipe network branch to achieve flow distribution, and secondly, adjusts the water flow distribution of the battery liquid flow heat exchanger. The controller regulates the opening degree of the water flow balance valve on the battery side to ensure that the monitored temperature deviation of the battery module temperature sensor < 2°C.

[0030] In some embodiments of the present application, the heat pump system can also control the humidity of the cabin environment air through fresh air heat exchange.

[0031] In some embodiments of the present application, the heating and cooling of the battery module are achieved by regulating the coolant circulation flow rate of the energy storage liquid flow pipe network. That is, the controller controls the rotation speed of the water pump on the liquid flow pipe network side. By increasing the rotation speed, the flow rate is increased to achieve the purpose of rapid heating and cooling of the battery. Attention should be paid to ensuring temperature consistency during battery heating and cooling. The controller adopts a double-layer strategy in the battery equal-temperature strategy. With the target of the temperature difference between battery modules being <2°C, the opening degree of the valves of the liquid flow main pipes in each battery compartment is adjusted. Secondly, the flow balance valve of the liquid flow pipe network branch is adjusted to control the inlet flow rate of the battery module. When the temperature difference between battery modules is close, the flow rate is ensured to be unchanged. When the temperature difference between battery modules is relatively large, for the side with a higher temperature of the battery module, the flow rate is increased to accelerate cooling, and the valve on the side with a lower temperature of the battery module is closed smaller to reduce the flow rate, so as to reduce the temperature difference between different battery modules.

[0032] The present application realizes the heating, cooling functions of the DC high-voltage battery system in the prefabricated cabin and the adjustment of the air environment temperature and humidity through the combined operation of a heat pump system, a photovoltaic collector, an accumulator, and a resistance wire heating system. In addition, for the integrated AC / DC design, the liquid flow pipe network is used to form an integrated thermal management for the AC side and the DC side. At the same time, the heat of the AC inverter is utilized to provide a heating source for the low-temperature condition of the battery. The present application effectively ensures the requirements for battery heating / cooling and temperature consistency control under all climate 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present application will be further described below in conjunction with the drawings and embodiments.

[0034] Figure 1 Schematic diagram of the thermal management system in some embodiments of the present application Figure 1 ; Figure 2 Schematic diagram of the thermal management system in some embodiments of the present application Figure 2 ; Among them, 1 - prefabricated cabin of energy storage power station, 2 - inverter device, 3 - battery module, 4 - battery liquid flow heat exchanger, 5 - inlet waterway of battery side heat exchanger, 6 - outlet waterway of battery side heat exchanger, 7 - inlet waterway of inverter side heat exchanger, 8 - outlet waterway of inverter side heat exchanger, 9 - branch pipe of inlet water pipe of liquid flow pipe network, 10 - main pipe of inlet water pipe of liquid flow pipe network, 11 - branch pipe of outlet water pipe of liquid flow pipe network, 12 - main pipe of outlet water pipe of liquid flow pipe network, 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 side heat exchanger fan, 21 - indoor side heat exchanger fan, 22 - photovoltaic collector, 23 - accumulator, 24 - phase change material filling cavity, 25 - finned heat transfer fin, 26 - inlet waterway of accumulator, 27 - outlet waterway of accumulator, 28 - connecting waterway between accumulator and multi - chamber heat exchanger, 29 - connecting waterway between resistance wire heater and multi - chamber heat exchanger, 30 - resistance wire heater, 31 - water storage tank, 32 - first heat exchange chamber, 33 - third heat exchange chamber, 34 - first throttle valve; 101 - controller, 102 - exhaust valve of liquid flow pipe network, 103 - flow balance valve of branch of liquid flow pipe network, 104 - flow balance valve of battery side waterway, 105 - waterway switch valve of inverter, 106 - waterway reversing valve of inverter; 201 - switch valve of main return water pipe of liquid flow pipe network, 202 - waterway switch valve of photovoltaic collector, 203 - second throttle valve, 204 - waterway switch valve of multi - chamber heat exchanger - resistance wire side water circuit, 205 - waterway switch valve of multi - chamber heat exchanger - accumulator side waterway, 206 - waterway switch valve of accumulator - water storage tank side waterway, 207 - waterway switch valve of water storage tank - accumulator waterway, 208 - outlet waterway switch valve of accumulator, 209 - waterway switch valve of first accumulator - resistance wire side waterway, 210 - waterway switch valve of accumulator, 211 - waterway switch valve of second accumulator - resistance wire side waterway, 212 - waterway switch valve of accumulator - multi - chamber heat exchanger waterway, 213 - waterway switch valve of resistance wire - multi - chamber heat exchanger waterway, 214 - refrigerant circuit switch valve of multi - chamber heat exchanger, 215 - first three - way valve, 301 - water pump of inverter circuit, 302 - water pump of liquid flow pipe network, 303 - water pump of water storage tank - accumulator, 304 - water pump of resistance wire waterway; 401 - temperature sensor at outlet of inverter, 402 - temperature sensor of battery module, 403 - temperature sensor of cabin environment, 404 - temperature sensor at outlet of accumulator, 405 - temperature sensor of water storage tank. Detailed implementation manners

[0035] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings and specific implementation manners. However, those skilled in the art will understand that the described embodiments are some embodiments of the present application, rather than all embodiments, and are only used to illustrate the present application and should not be regarded as limiting the scope of the present application.

[0036] It should be noted that the following detailed description is illustrative and is 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 of ordinary skill in the technical field to which the present application belongs.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or relative positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application. Without special explanation, under the condition of satisfying the relative positional relationship shown in the drawings, the above-mentioned directional description can be flexibly set during the actual application process.

[0038] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", "couple", "communicate" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the electrical connection between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] In the embodiments of the present application, the term "comprise", "include" or any other variant thereof is intended to cover a 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 expressly listed, or elements inherent to such process, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, article or device comprising the element.

[0041] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. In any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application, it should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0042] The following combines Figure 1 and 2 to further explain and illustrate the solution of the present application.

[0043] 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: A refrigerant circulation circuit 15, which sequentially connects a compressor 18, a four-way valve 17, an indoor heat exchanger 19, a first throttle valve 34, and an outdoor heat exchanger 16; A circulating water circuit, which includes a liquid flow network inlet pipe branch 9, a liquid flow network inlet pipe main header 10, a liquid flow network outlet pipe branch 11, and a liquid flow network outlet pipe main header 12; An energy storage power station prefabricated cabin 1, one end of which is communicated with the liquid flow network inlet pipe main header 10 through the liquid flow network inlet pipe branch 9, and the other end is communicated with the liquid flow network outlet pipe main header 12 through the liquid flow network outlet pipe branch 11; A multi-chamber heat exchanger 13, which at least includes 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 communicated with the liquid flow network inlet pipe main header 10, and the other end is communicated with the liquid flow network outlet pipe main header 12; One end of the second heat exchange chamber 14 is communicated with the refrigerant circulation circuit 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; A water storage tank 31, its first end is communicated with the liquid flow network outlet pipe main header 12, and its second end is communicated with a photovoltaic collector 22 through a water path; An accumulator 23, one end of which is communicated with one end of the third heat exchange chamber 33 through an accumulator-multi-chamber heat exchanger communication water path 28, and the other end is communicated with the third end of the water storage tank 31 through an accumulator outlet water path 27; A switch valve group for controlling the on-off of pipelines.

[0044] In some embodiments of the present application, the water storage tank has at least three functions. The first function is to be arranged as a water tank at the high position of the system, playing the role of overflow and makeup water; the second function is to be the water tank heated by the photovoltaic collector 22; the third function is to provide cold / hot water for the energy accumulator 23 to realize the melting and condensation phase change regulation of the phase change material, and to cool and heat the battery module 3.

[0045] The cross-season heat storage can realize the heating of the water storage tank 31 by the photovoltaic collector 22. The hot water enters the energy accumulator 23 to melt the phase change material; the energy accumulator 23 can also use the resistance wire for auxiliary heating to realize the melting and heat storage of the phase change material.

[0046] In some embodiments of the present application, the reversing function of the four-way valve 17 realizes the heat absorption and heat release regulation of the refrigerant in the multi-chamber heat exchanger 13. At the same time, the indoor side 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.

[0047] In some embodiments of the present application, the energy accumulator 23, in combination with the photovoltaic collector 22, conducts the melting and heat storage of the phase change material; it can also use the resistance wire heating to store the heat of the melting of the phase change material.

[0048] In some embodiments of the present application, the circulating water circuit further includes a resistance wire heater - multi-chamber heat exchanger connecting waterway 29, one end of which is connected to the energy accumulator - multi-chamber heat exchanger connecting waterway 28, and the other end is connected to the energy accumulator outlet waterway 27. The resistance wire heater 30 is arranged on the resistance wire heater - multi-chamber heat exchanger connecting waterway 29.

[0049] In some embodiments of the present application, an inverter device 2, a battery module 3 and a battery liquid flow heat exchanger 4 are arranged 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. One end of the inverter device 2 is connected to the liquid flow network inlet pipe branch 9 through the inverter side heat exchanger inlet waterway 7, and the other end is connected to the liquid flow network outlet pipe branch 11 through the inverter side heat exchanger outlet waterway 8; one end of the battery liquid flow heat exchanger 4 is connected to the liquid flow network inlet pipe branch 9 through the battery side heat exchanger inlet waterway 5, and the other end is connected to the liquid flow network outlet pipe branch 11 through the battery side heat exchanger outlet waterway 6.

[0050] 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 integrally arranged, and can form an integrated thermal management through the liquid flow network, and at the same time realize the recovery of the waste heat of the inverter to heat the battery module 3.

[0051] In some embodiments of the present application, the accumulator 23 includes a phase change material filling cavity 24 and ribbed heat exchange fins 25. The accumulator inlet water passage 26 and the accumulator outlet water passage 27 penetrate through the ribbed heat exchange fins 25, and heat exchange occurs between the water in the water passage and the phase change material.

[0052] In some embodiments of the present application, the phase change material in the phase change material filling cavity is paraffin, crystal hydrate salt, or formic acid, and the phase change temperature range is 35 - 60 °C.

[0053] In some embodiments of the present application, the phase change material filling cavity 24 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, materials with a higher phase change temperature are filled near the water inlet side, and materials with a lower phase change temperature are filled near the water outlet side. The purpose is to drive heat exchange using the temperature difference.

[0054] In some embodiments of the present application, the switching valve group includes a liquid flow network exhaust valve 102 disposed upstream of the main trunk pipe 10 of the water inlet pipe of the liquid flow network, a liquid flow network branch flow balance valve 103 disposed on the upstream side of the branch 9 of the water inlet pipe of the liquid flow network, for controlling the water flow rate into the inverter device 2 and the battery liquid flow heat exchanger 4; a battery side water flow balance valve 104 disposed on the water inlet path 5 of the battery side heat exchanger; an inverter water path switching valve 105 disposed on the water inlet path 7 of the inverter side heat exchanger; an inverter water path reversing valve 106 disposed on the branch 11 of the water outlet pipe of the liquid flow network; a liquid flow network return main trunk pipe switching valve 201 disposed on the main trunk pipe 12 of the water outlet pipe of the liquid flow network; a photovoltaic collector water path switching valve 202 for controlling the water inlet or drainage of the photovoltaic collector 22; a second throttle valve 203 is disposed on the second refrigerant pipeline; a multi-chamber heat exchanger-resistance wire side water path switching valve 204 is disposed on the connecting water path 29 between the resistance wire heater and the multi-chamber heat exchanger; a multi-chamber heat exchanger-accumulator side water path switching valve 205 is disposed on the pipeline connecting the multi-chamber heat exchanger 13 and the accumulator outlet water path 27; an accumulator-water storage tank side water path switching valve 206 is disposed on the pipeline connecting the outlet of the accumulator 23 and the third end of the water storage tank 31; an accumulator-water storage tank water path switching valve 207 is disposed on the pipeline connecting the accumulator inlet water path 26 and the water storage tank 31; an accumulator outlet water path switching valve 208 is disposed on the pipeline at the outlet of the accumulator 23; a first accumulator-resistance wire side water path switching valve 209 is disposed between the water path of the accumulator 23 and the resistance wire side; an accumulator water path switching valve 210 is disposed at the water inlet of the accumulator 23; a second accumulator-resistance wire side water path switching valve 211 is disposed on the water path connecting the connecting water path 29 between the resistance wire heater and the multi-chamber heat exchanger and the accumulator inlet water path 26; an accumulator-multi-chamber heat exchanger water path switching valve 212 is disposed on the water path on the side of the accumulator inlet water path 26 away from the accumulator 23; a resistance wire-multi-chamber heat exchanger water path switching valve 213 is disposed at a position on the connecting water path 29 between the resistance wire heater and the multi-chamber heat exchanger away from the resistance wire heater 30; a multi-chamber heat exchanger-refrigerant circuit switching valve 214 is disposed on the first refrigerant pipeline; a first three-way valve 215 is disposed at the intersection of the first refrigerant pipeline and the refrigerant circulation circuit 15.

[0055] In some embodiments of the present application, an inverter circuit water pump 301 is disposed on the branch 11 of the water outlet pipe of the liquid flow network, and a liquid flow network water pump 302 is disposed on the pipeline connecting the first heat exchange chamber 32 and the main trunk pipe 12 of the water outlet pipe of the liquid flow network; an accumulator-water storage tank water pump 303 is disposed on the pipeline connecting the accumulator outlet water path and the water storage tank; a resistance wire water path water pump 304 is disposed on the connecting water path 29 between the resistance wire heater and the multi-chamber heat exchanger.

[0056] In some embodiments of the present application, an inverter outlet water temperature sensor 401 is provided on the water outlet path 8 of the heat exchanger on the inverter side; a battery module temperature sensor 402 is provided at the battery module 3; a cabin ambient temperature sensor 403 is provided inside the prefabricated cabin 1 of the energy storage power station; an accumulator outlet temperature sensor 404 is provided on the accumulator outlet water path 27; a water tank temperature sensor 405 is provided at the water storage tank 31 for detecting the water temperature inside the water storage tank 31.

[0057] In some embodiments of the present application, the thermal management system further includes a controller 101, and the controller is electrically connected to the above-mentioned valves, water pumps, and temperature sensors.

[0058] In some other embodiments of the present application, there is also provided a full-climate thermal management method for an energy storage power station with a cross-season energy storage device, including Mode 1: Recycling the waste heat of the inverter to heat the battery. Specifically: The controller 101 judges the battery heating / cooling demand. When the temperature detected by the inverter outlet water temperature sensor 401 satisfies T1 = 35°C, the battery-side water path flow balance valve 104, the inverter water path switch valve 105, and the inverter water path reversing valve 106 are opened, so that the water circulation direction is from the inverter device 2 → the inverter water path switch valve 105 → the battery-side water path flow balance valve 104 → the battery liquid flow heat exchanger 4 → the inverter device 2. When the battery is in a low-temperature condition, the heat of the inverter is used for heating. By adjusting the rotation speed of the inverter loop water pump 301, the heat exchange of the inverter heat is used for battery heating to meet the battery low-temperature heating power demand.

[0059] In some embodiments of the present application, in order to improve the battery heating efficiency, the controller 101 adjusts the rotation speed of the inverter loop water pump 301 to increase the water circulation flow rate to achieve the purpose of rapid heat exchange.

[0060] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device, including Mode 2: The accumulator condenses and releases heat to heat the battery. Specifically: The controller 101 judges 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 path switch valve 212, the accumulator water path switch valve 210, the multi-chamber heat exchanger - accumulator side water path switch valve 205, and the accumulator outlet water path switch valve 208 are opened, so that the water in the accumulator 23 circulates from the accumulator 23 → the accumulator outlet water path 27 → the third heat exchange chamber 33 → the accumulator - multi-chamber heat exchanger connection water path 28 → the accumulator inlet water path 26 → the accumulator 23, so that the coolant in the accumulator outlet water path 27 exchanges heat with the coolant in the liquid flow pipe network in the multi-chamber heat exchanger 13, and the temperature of the coolant in the liquid flow pipe network rises to heat the battery module 3.

[0061] In some embodiments of the present application, in order to accelerate the heat exchange rate of the liquid flow pipe network with respect to the battery, the rotational speed of the liquid flow pipe network water pump 302 is increased to increase the liquid flow rate of the liquid flow pipe network, so as to achieve rapid temperature rise of the battery. At the same time, in order to control the temperature consistency of multiple battery cells in different cabins, the controller 101 first adjusts the flow rate of the water inlet branch 9 of the liquid flow pipe network and adjusts the flow balance valve 103 of the liquid flow pipe network branch to achieve flow distribution. Secondly, the controller 101 adjusts the water flow distribution of the battery liquid flow heat exchanger 4 and controls the opening degree of the water flow balance valve 104 on the battery side to ensure that the monitored temperature deviation of the battery module temperature sensor 402 is <2°C.

[0062] In some embodiments of the present application, in order to realize the condensation heat release 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 stores heat and melts, and a resistance wire loop heating is adopted. The temperature T2 detected by the temperature sensor 404 at the outlet of the accumulator is monitored. When T2 is less than 35°C, the controller 101 controls the resistance wire heater 30 to turn on, and controls the opening of the waterway switch valve 208 at the outlet of the accumulator, the first accumulator-resistance wire side waterway switch valve 209, the accumulator waterway switch valve 210, and the second accumulator-resistance wire side waterway switch valve 211, and closes other valves. At this time, the resistance wire heats the coolant, and the heated coolant circulates through the connecting waterway 29 between the resistance wire heater and the multi-chamber heat exchanger → the connecting waterway 28 between the accumulator and the multi-chamber heat exchanger → the accumulator 23 → the resistance wire heater 30. The coolant carries the heat of the resistance wire heating and enters the accumulator 23 through the cycle to provide heat for the melting of the phase change material in the accumulator.

[0063] In some embodiments of the present application, in order to realize the condensation heat release 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 stores heat and melts, and a photovoltaic collector 22 loop heating is adopted. The temperature T2 detected by the temperature sensor 404 at the outlet of the accumulator is monitored. When T2 is less than 35°C, and the temperature T3 detected by the temperature sensor 405 of the water storage tank is monitored. When T3 satisfies T3 < 35°C, the hot water in the water storage 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 opening of the photovoltaic collector waterway switch valve 202 to realize the heating of the hot water in the water storage tank 31 by the photovoltaic collector 22. When T3 satisfies T3 > 60°C, the photovoltaic collector waterway switch valve 202 is closed, the accumulator-water storage tank side waterway switch valve 206 and the water storage tank-accumulator waterway switch valve 207 are opened, and the accumulator waterway switch valve 210 and the accumulator outlet waterway switch valve 208 are closed. The coolant in the water storage tank 31 circulates through the water storage tank 31 → the accumulator inlet waterway 26 → the accumulator 23 → the accumulator outlet waterway 27 → the water storage tank 31. The coolant carries heat and enters the accumulator 23 through the cycle to provide heat for the melting of the phase change material in the accumulator.

[0064] In some embodiments of the present application, in order to accelerate the energy exchange efficiency between the water storage tank 31 and the accumulator 23 and accelerate the melting rate of the phase change material filled in the accumulator 23, the controller 101 controls the water storage tank - accumulator water pump 303 to increase its rotational speed, increasing the heat exchange loop: water storage tank 31 → accumulator inlet waterway 26 → accumulator 23 → accumulator outlet waterway 27 → water storage tank 31 liquid flow rate, so as to achieve the purpose of increasing the melting rate of the phase change material.

[0065] In some embodiments of the present application, in order to realize the condensation heat release of the phase change material filled in the accumulator 23 from liquid to solid, it is necessary to heat the accumulator 23 to make the filled phase change material store heat and melt; the method of heating simultaneously by the photovoltaic collector 22 loop and the resistance wire loop is adopted; monitor the temperature T2 detected by the accumulator outlet temperature sensor 404. When the temperature T2 < 35°C, monitor the water storage tank temperature sensor 405 arranged in the water storage tank 31. When its temperature T3 satisfies T3 < 35°C, use the photovoltaic collector 22 to heat the water storage tank 31 to provide melting heat for the phase change material filled in the accumulator 23; the controller 101 controls the opening of the photovoltaic collector waterway switch valve 202 to realize the heating of the water storage tank 31 with hot water by the photovoltaic collector 22; when T3 satisfies T3 > 60°C, close the photovoltaic collector waterway switch valve 202, and open the accumulator - water storage tank side waterway switch valve 206, the water storage tank - accumulator waterway switch valve 207, the accumulator outlet waterway switch valve 208, the first accumulator - resistance wire side waterway switch valve 209, the accumulator waterway switch valve 210, and the second accumulator - resistance wire side waterway switch valve 211; the coolant circulates through the water storage tank 31 → accumulator inlet waterway 26 → accumulator 23 → accumulator outlet waterway 27 → water storage tank 31. At the same time, the resistance wire heater 30 heats the coolant, and the heated coolant circulates through the resistance wire heater 30 → the second accumulator - resistance wire side waterway switch valve 211 → accumulator inlet waterway 26 → accumulator 23 → accumulator outlet waterway 27 → the first accumulator - resistance wire side waterway switch valve 209 → resistance wire heater 30. The coolant carries the heating heat of the resistance wire heater 30 and the photovoltaic collector 22 and enters the accumulator 23 through circulation to provide heat for the melting of the accumulator phase change material.

[0066] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes Mode 3: The photovoltaic collector heats the battery with hot water. The photovoltaic collector 22 heats the coolant in the water storage tank 31. When the water storage tank temperature sensor 405 detects that T3 reaches 60°C, the hot water heats the liquid flow pipe network of the energy storage battery module 3 in the multi-chamber heat exchanger 13, realizing low-temperature auxiliary heating of the energy storage battery module 3. The controller 101 controls the opening of the waterway switch valve 202 of the photovoltaic collector, closes the waterway switch valve 206 on the accumulator-water storage tank side and the waterway switch valve 207 between the water storage tank and the accumulator. When the water storage tank temperature sensor 405 detects that T3 > 60°C, the waterway switch valve 202 of the photovoltaic collector is closed, the waterway switch valve 206 on the accumulator-water storage tank side and the waterway switch valve 207 between the water storage tank and the accumulator are opened, the waterway switch valve 210 of the accumulator, the waterway switch valve 212 between the accumulator and the multi-chamber heat exchanger, and the waterway switch valve 213 between the resistance wire and the multi-chamber heat exchanger are opened. The waterway switch valve 205 on the multi-chamber heat exchanger-accumulator side, the waterway switch valve 206 on the accumulator-water storage tank side, and the waterway switch valve 208 at the accumulator outlet are opened, so that the coolant circulates in the pipeline according to the water storage tank 31 → the waterway switch valve 207 between the water storage tank and the accumulator → the connected waterway 28 between the accumulator and the multi-chamber heat exchanger → the third heat exchange chamber 33 → the waterway switch valve 205 on the multi-chamber heat exchanger-accumulator side → the waterway switch valve 206 on the accumulator-water storage tank side → the water storage tank 31. The photovoltaic collector 22 heats the coolant in the water storage tank 31 and heats the coolant of the energy storage liquid flow pipe network.

[0067] In some embodiments of the present application, in order to accelerate the energy exchange efficiency from the water storage tank 31 to the multi-chamber heat exchanger 13, the controller 101 controls the water pump 303 between the water storage tank and the accumulator to increase its speed and increase the circulating liquid flow rate. For the liquid flow pipe network side, the energy exchange in the multi-chamber heat exchanger 13 is strengthened by increasing the flow rate of the heat exchange loop. The controller 101 controls the speed of the liquid flow pipe network water pump 302 to increase its speed and increase the liquid flow rate of the liquid flow pipe network, achieving the purpose of quickly cooling the battery module 3. At the same time, in order to control the temperature consistency of multiple battery monomers in different cabins, the controller 101 first adjusts the flow rate of the liquid flow pipe network inlet water branch 9 and adjusts the flow balance valve 103 of the liquid flow pipe network branch to achieve flow distribution. Secondly, the controller 101 regulates the flow distribution of the water inlet of the battery liquid flow heat exchanger 4, and regulates the opening of the waterway flow balance valve 104 on the battery side to ensure that the temperature deviation of the battery module 3 < 2°C.

[0068] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes Mode Four: heat supply by a heat pump system. 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 through heat exchange with the first heat exchange chamber 32, the coolant circulation is achieved to heat the battery module 3. Specifically, in the heating condition for the battery module 3, the heat pump system is in the heat supply mode. At this time, the refrigerant is compressed by the compressor 18, enters the second heat exchange chamber 14 through the first three-way valve 215 for condensation and heat release, and the first heat exchange chamber 32 absorbs the heat of the refrigerant to heat the battery module 3. Subsequently, the refrigerant is throttled and depressurized by the second throttle valve 203 and enters the outdoor heat exchanger 16.

[0069] In some embodiments of the present application, when using the heat pump system to supply heat to 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 on the liquid flow network side. Secondly, the controller 101 controls the compressor 18 of the heat pump system and increases its rotation speed to increase the heat supply of the heat pump system. At the same time, in order to control the temperature consistency of multiple battery monomers in different cabins, the controller 101 first adjusts the flow rate of the inlet water branch 9 of the liquid flow network, adjusts the flow balance valve 103 of the liquid flow network branch to achieve flow distribution. Secondly, the controller 101 adjusts the inlet water flow distribution of the battery liquid heat exchanger 4, and the controller 101 controls the opening degree of the flow balance valve 104 on the battery side water circuit to ensure that the temperature deviation of the battery module 3 is <2°C.

[0070] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes Mode Five: heating by a resistance wire heater 30. Specifically, when the battery module 3 is heated at low temperature, the controller 101 controls the resistance wire heater 30 to turn on, turns on the resistance wire - multi-chamber heat exchanger water circuit switch valve 213 and the multi-chamber heat exchanger - resistance wire side water circuit switch valve 204, and closes other valves to realize the circulation of the coolant in the resistance wire heater 30 and the third heat exchange chamber 33. The coolant heated by the resistance wire exchanges heat with the energy storage liquid flow network through the internal flow path of the multi-chamber heat exchanger 13.

[0071] In some embodiments of the present application, when using the heat pump system to supply heat to 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 on the liquid flow network side; secondly, the controller 101 increases the number of turned-on resistance wires. The power of a single resistance wire is 2kW or 4kW, and there are multiple resistance wires. By controlling the number of turned-on resistance wires, the heating power on the resistance wire side is increased to enhance the heat supply capacity. In addition, the controller 101 controls the rotation speed of the resistance wire water pump 304 to increase the coolant flow rate in this circuit and strengthen the heat exchange.

[0072] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes Mode Six: the cross-season energy accumulator absorbs heat by melting to cool the battery. The phase change material is filled in the energy accumulator 23 and absorbs heat through solid-liquid phase change to cool the coolant. Then, the heat generated by the battery module 3 is circulated through the coolant in the energy storage liquid flow network, and heat exchange is realized with the coolant on the energy accumulator 23 side through the multi-chamber heat exchanger 13, thereby completing the cooling of the battery. Specifically, the controller 101 controls the opening of the waterway switch valve 212 between the energy accumulator and the multi-chamber heat exchanger, the waterway switch valve 210 of the energy accumulator, the waterway switch valve 208 at the outlet of the energy accumulator, and the waterway switch valve 205 on the energy accumulator side of the multi-chamber heat exchanger, so that the coolant on the energy accumulator 23 side circulates between the energy accumulator 23 and the third heat exchange chamber 33. The coolant carrying the heat generated by the battery enters the energy accumulator 23, and the heat is transferred to the phase change material. The phase change material absorbs heat and melts, completing the cooling of the battery module 3.

[0073] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes a natural cooling mode of the water storage tank. The heat generated by the battery is circulated through the coolant in the energy storage liquid flow network, and heat exchange is realized between the coolant on the battery side and the coolant on the water storage tank 31 side through the multi-chamber heat exchanger 13 to complete the cooling of the battery. Specifically, the controller 101 controls the opening of the waterway switch valve 205 on the energy accumulator side of the multi-chamber heat exchanger, the waterway switch valve 206 between the energy accumulator and the water storage tank, the waterway switch valve 207 between the water storage tank and the energy accumulator, the waterway switch valve 208 at the outlet of the energy accumulator, the waterway switch valve 210 of the energy accumulator, and the waterway switch valve 212 between the energy accumulator and the multi-chamber heat exchanger, so that the coolant in the water storage tank 31 circulates through the water storage tank 31 → the waterway switch valve 207 between the water storage tank and the energy accumulator → the communication waterway 28 between the energy accumulator and the multi-chamber heat exchanger → the third heat exchange chamber 33 → the waterway switch valve 205 on the energy accumulator side of the multi-chamber heat exchanger → the waterway switch valve 206 between the energy accumulator and the water storage tank. In the multi-chamber heat exchanger 13, the coolant carrying the heat generated by the battery transfers the heat to the coolant on the water storage tank 31 side. The temperature of the coolant in the water storage tank 31 is reduced through natural cooling, achieving the purpose of cooling the battery.

[0074] In some embodiments of the present application, in order to accelerate the cooling rate of the battery module 3, the controller 101 regulates the coolant flow rate on the liquid flow network side, regulates the rotation speed of the liquid flow network water pump 302, increases the rotation speed, and increases the coolant flow rate on the liquid flow network side to accelerate the battery cooling; the controller 101 increases the circulation coolant flow rate by increasing the rotation speed of the water storage tank - energy accumulator water pump 303.

[0075] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes mode eight: a heat pump system cooling mode, using the heat pump system cooling mode to realize the refrigerant circulation loop 15 to evaporate and absorb heat in the second heat exchange chamber 14, thereby cooling the energy storage liquid flow pipeline network coolant that entrains the heat generated by the battery module 3, and 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 to form a closed system of the refrigerant circulation loop 15; under the condition of cooling the battery, the heat pump system is in the 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 the second throttle valve 203 throttles and reduces the pressure and enters the second heat exchange chamber 14, at this time absorbing the energy storage liquid flow pipeline network coolant that entrains the heat generated by the battery, and the refrigerant vaporizes and absorbs heat, thereby completing the cooling of the battery side coolant.

[0076] 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 battery cooling; 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.

[0077] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season 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 then changes direction 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 controlling the speed of the indoor heat exchanger fan 21 by the controller 101; the controller 101 increases the heating power of the indoor heat exchanger 19 by controlling the speed of the heat pump system compressor 18, and can also control the opening of the first throttle valve 34 and the speed of the outdoor heat exchanger fan 20 to achieve it.

[0078] In some embodiments of the present application, a full-climate thermal management method for an energy storage power station with a cross-season energy storage device includes mode ten: an air environment cooling mode of a heat pump system. When cooling the battery, the heat pump system is in a 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.

[0079] In some embodiments of the present application, the thermal management method of the present application includes the following modes: Mode 1: Recycling the waste heat of the inverter to heat the battery; Mode 2: Heating the battery during the condensation heat release process of the seasonal storage accumulator; Mode 3: Heating the battery with the hot water from the photovoltaic collector; Mode 4: Heating mode of the heat pump system; Mode 5: Electric heating with resistance wire; Mode 6: Cooling the battery by the endothermic melting of the seasonal storage accumulator; Mode 7: Natural cooling mode of the water storage tank; Mode 8: Refrigeration mode of the heat pump system; Mode 9: Air environment heating mode of the heat pump system; Mode 10: Air environment refrigeration mode of the heat pump system.

[0080] In some embodiments of the present application, for the thermal management method of the present application, when heating the battery at low temperature, Modes 1-5 can be freely combined. When cooling the battery at high temperature, Modes 6-8 can be freely combined.

[0081] In some embodiments of the present application, the heat pump system can also control the air humidity in the cabin environment through fresh air heat exchange.

[0082] In some embodiments of the present application, the heating and cooling of the battery module 3 are achieved by regulating the coolant circulation flow rate of the energy storage liquid flow pipe network. That is, the controller 101 controls the rotation speed of the water pump on the liquid flow pipe network side. Increasing the rotation speed can increase the flow rate and achieve the purpose of quickly heating and cooling the battery. Attention should be paid to ensuring the temperature consistency during battery heating and cooling. The controller 101 adopts a double-layer strategy in the battery equal-temperature strategy. Taking the temperature difference between battery modules 3 < 2°C as the target, the opening of the valves of the liquid flow main pipes in each battery compartment is adjusted. Secondly, the flow balance valve 103 of the liquid flow pipe network branch is adjusted to control the inlet flow rate of the battery module 3. When the temperature difference between the battery modules is close, the flow rate remains unchanged. When the temperature difference between the battery modules 3 is relatively large, the flow rate on the high-temperature side of the battery module 3 increases to accelerate cooling, and the valve on the low-temperature side of the battery module 3 is closed to reduce the flow rate to reduce the temperature difference between different battery modules.

[0083] In some embodiments of the present application, when using the heat pump system for heating or refrigeration, the controller 101 increases the heating / cooling capacity by controlling the rotation speed of the compressor 18 and switching the four-way valve 17; for the 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 rotation speed of the indoor heat exchanger fan, the rotation speed of the compressor 18, and the throttling openings 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.

[0084] This application realizes the heating and cooling functions of the DC high-voltage battery module in the prefabricated cabin and the regulation of the air environmental temperature and humidity through the combined operation of a heat pump system, a photovoltaic collector, an accumulator, and a resistance wire heating system. In addition, for the integrated AC / DC design, a liquid flow pipe network is used to form integrated thermal management on the AC side and the DC side. At the same time, the heat of the inverter is utilized to provide a heating source for the battery under low-temperature conditions. This application effectively ensures the requirements for battery heating / cooling and temperature consistency control under all climate 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.

[0085] The above-described embodiments merely represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these belong to the protection scope of this application. Therefore, the protection scope of this application should 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, Including: A refrigerant cycle circuit, which is sequentially connected to a compressor, a four-way valve, an indoor heat exchanger, a first throttle valve, and an outdoor heat exchanger; A circulating water circuit, which includes a liquid flow network inlet pipe branch, a liquid flow network inlet pipe main header, a liquid flow network outlet pipe branch, and a liquid flow network outlet pipe main header; A prefabricated energy storage station cabin, one end of which is communicated with the liquid flow network inlet pipe main header through the liquid flow network inlet pipe branch, and the other end is communicated with the liquid flow network outlet pipe main header through the liquid flow network outlet pipe branch. An inverter device and a battery module are distributed in the prefabricated energy storage station cabin; A multi-chamber heat exchanger, which at least includes 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 communicated with the liquid flow network inlet pipe main header, and the other end is communicated with the liquid flow network outlet pipe main header; One end of the second heat exchange chamber is communicated with the refrigerant cycle circuit between the four-way valve and the indoor heat exchanger through a first refrigerant pipeline, and the other end is connected to the outdoor heat exchanger through a second refrigerant pipeline. A second throttle valve is also provided on the second refrigerant pipeline between the second heat exchange chamber and the outdoor heat exchanger; A water storage tank, the first end of which is communicated with the liquid flow network outlet pipe main header, and the second end is communicated with a photovoltaic collector through a waterway; An accumulator, one end of which is communicated with one end of the third heat exchange chamber through an accumulator-multi-chamber heat exchanger communication waterway, and the other end is communicated with the third end of the water storage tank through an accumulator outlet waterway; A switching valve group for controlling the on-off of the pipeline; The circulating water circuit further includes a resistance wire heater-multi-chamber heat exchanger communication waterway, one end of which is communicated with the accumulator-multi-chamber heat exchanger communication waterway, and the other end is communicated with the accumulator outlet waterway. The resistance wire heater is arranged on the resistance wire heater-multi-chamber heat exchanger communication waterway.

2. The all-climate thermal management system for an energy storage power station with a cross-seasonal energy storage device according to claim 1, characterized in that, The inverter device and the battery module are integrally arranged, and can form integrated thermal management through the liquid flow network, and at the same time realize the recovery of the waste heat of the inverter 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, An inverter device, a battery module, and a battery liquid heat exchanger are arranged in the prefabricated energy storage station cabin; The battery liquid heat exchanger is located below the battery module. One end of the inverter device is communicated with the liquid flow network inlet pipe branch through an inverter side heat exchanger inlet waterway, and the other end is communicated with the liquid flow network outlet pipe branch through an inverter side heat exchanger outlet waterway; One end of the battery liquid heat exchanger is communicated with the liquid flow network inlet pipe branch through a battery side heat exchanger inlet waterway, and the other end is communicated with the liquid flow network outlet pipe branch through a battery side heat exchanger outlet waterway.

4. The all-climate thermal management system for an energy storage station with a cross-seasonal energy storage device according to claim 1, wherein The accumulator includes a phase change material filling cavity and finned heat exchange fins. The accumulator inlet waterway and the accumulator outlet waterway penetrate through the finned heat exchange fins, and the coolant in the waterway exchanges heat with the phase change material; The phase change material in the phase change material filling cavity is paraffin, hydrated salt, or 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 different phase change materials are filled in partitions; when different phase change materials are filled in partitions, materials with a higher phase change temperature are filled near the water inlet side, and materials with a lower phase change temperature are filled near the water outlet side, aiming to utilize the temperature difference to drive heat exchange.

5. A full-climate thermal management system for an energy storage power station with a cross-season energy storage device according to claim 1, wherein the switching valve group includes: a liquid flow network exhaust valve provided upstream of the main pipe of the water inlet pipe of the liquid flow network, a liquid flow network branch flow balance valve provided upstream of the branch of the water inlet pipe of the liquid flow network for controlling the water flow into the inverter device and the battery liquid heat exchanger; a battery-side water flow balance valve provided on the water inlet path of the battery-side heat exchanger; an inverter water path switching valve provided on the water inlet path of the inverter-side heat exchanger; an inverter water path reversing valve provided on the branch of the water outlet pipe of the liquid flow network; a liquid flow network return main pipe switching valve provided on the main pipe of the water outlet pipe of the liquid flow network; a photovoltaic collector water path switching valve for controlling the water inlet or drainage of the photovoltaic collector; a multi-chamber heat exchanger-resistance wire side water circuit switching valve is provided on the connecting water path of the resistance wire heater-multi-chamber heat exchanger; a multi-chamber heat exchanger-accumulator side water circuit switching valve is provided on the pipeline connecting the multi-chamber heat exchanger and the outlet water path of the accumulator; an accumulator-accumulation tank side water circuit switching valve is provided on the pipeline connecting the outlet of the accumulator and the third end of the accumulation tank; a storage tank-accumulator water path switching valve is provided on the pipeline connecting the inlet water path of the accumulator and the storage tank; an accumulator outlet water path switching valve is provided on the outlet pipeline of the accumulator; a first accumulator-resistance wire side water circuit switching valve is provided between the water path connecting the accumulator and the resistance wire heater; an accumulator water path 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 path connecting the connecting water path of the resistance wire heater-multi-chamber heat exchanger and the inlet water path of the accumulator; an accumulator-multi-chamber heat exchanger water path switching valve is provided on the water path on the side of the inlet water path of the accumulator away from the accumulator; a resistance wire-multi-chamber heat exchanger water path switching valve is provided at the place where the connecting water path of the resistance wire heater-multi-chamber heat exchanger is away from the resistance wire heater; a multi-chamber 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 1-5, wherein an inverter loop water pump is provided on the branch of the water outlet pipe 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 pipe of the water outlet pipe of the liquid flow network; a storage tank-accumulator water pump is provided on the pipeline connecting the outlet water path of the accumulator and the storage tank; a resistance wire water path pump is provided on the connecting water path of the resistance wire heater-multi-chamber heat exchanger. An inverter outlet water temperature sensor is provided on the waterway at the outlet of the heat exchanger on the inverter side; a battery module temperature sensor is provided at the battery module; a cabin ambient temperature sensor is provided inside the prefabricated cabin of the energy storage power station; an accumulator outlet temperature sensor is provided on the waterway at the outlet of the accumulator; a water tank temperature sensor is provided at the water storage tank for detecting the water temperature inside the water storage 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 according to claim 6, the thermal management method includes: Mode 1: Recovering waste heat from the inverter to heat the battery; Mode 2: Heating the battery during the condensation heat release process of the seasonal energy storage accumulator; Mode 3: Heating the battery with hot water from the photovoltaic collector; Mode 4: Heating by the heat pump system; Mode 5: Electric heating with a resistance wire; Mode 6: Cooling the battery by the melting heat absorption of the seasonal energy storage accumulator; Mode 7: Natural cooling mode of the water storage tank; Mode 8: Refrigeration mode of the heat pump system; Mode 9: Air environment heating mode of the heat pump system; Mode 10: Air environment refrigeration mode of the heat pump system.

8. A full-climate thermal management method for an energy storage power station with a seasonal energy storage device according to claim 7, characterized in that Mode 1: Recovering waste heat from the inverter to heat the battery module. Specifically, the controller judges the battery heating / cooling demand. When the temperature detected by the inverter outlet water temperature sensor meets the first condition, that is, when it reaches T1, the switch valve group is controlled to make the water circulation direction be from the inverter device → the battery liquid flow heat exchanger → the inverter device, and the waste heat of the inverter is used for heating. By adjusting the rotational speed of the water pump in the inverter circuit, the heat exchange of the inverter heat is used for battery heating to meet the low-temperature heating power demand of the battery. Mode 2: Heating the battery during the condensation heat release process of the seasonal energy storage accumulator. Specifically, the controller judges the battery heating / cooling demand. When the temperature T2 detected by the accumulator outlet temperature sensor meets the second condition, the switch valve group is controlled to make the water in the accumulator flow from the accumulator → the waterway at the outlet of the accumulator → the third heat exchange chamber → the connected waterway of the accumulator-multi-chamber heat exchanger → the waterway at the inlet of the accumulator → the accumulator for circulation, so that the coolant in the waterway at the outlet of the accumulator exchanges heat with the coolant in the liquid flow pipe network in the multi-chamber heat exchanger, and the temperature of the coolant in the liquid flow pipe network rises and then heats the battery module. Mode 3: Heating the battery with hot water from the photovoltaic collector. The photovoltaic collector heats the coolant in the water storage tank. When the water tank temperature sensor detects that T3 meets the third condition, the hot water heats the liquid flow pipe network of the energy storage battery module in the multi-chamber heat exchanger; the opening of the switch valve group is controlled to make the coolant circulate in the pipeline according to the path of the water storage tank → the connected waterway of the accumulator-multi-chamber heat exchanger → the third heat exchange chamber → the accumulator → the water storage tank. The photovoltaic collector heats the coolant in the water storage tank and heats the coolant in the energy storage liquid flow pipe network. Mode 4: Heating by the heat pump system. Specifically, the heat pump system realizes the heat release of the refrigerant in the second heat exchange chamber through the refrigerant circulation loop, and through heat exchange with the first heat exchange chamber, the coolant circulation is achieved to heat the battery module. Specifically: In the heating condition for the battery module, the heat pump system is in the heating mode. At this time, the refrigerant is compressed by the compressor, enters the second heat exchange chamber through the first three-way valve for condensation and heat release, and the first heat exchange chamber absorbs the heat of the refrigerant to heat the battery module. Subsequently, the refrigerant is throttled and depressurized by the second throttle valve and enters the outdoor heat exchanger; Mode 5: Heating by the resistance wire heater. Specifically: When the battery module is heated at low temperature, the controller controls the resistance wire heater to turn on, and turns on the waterway switch valve of the resistance wire - multi - chamber heat exchanger and the water circuit switch valve of the multi - chamber heat exchanger - resistance wire side, so as to realize the circulation of the 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 path of the multi - chamber heat exchanger; Mode 6: Cooling the battery by the cross - season accumulator melting and absorbing heat. The accumulator is filled with a phase - change material that absorbs heat through solid - liquid phase change to cool the coolant, and then the heat generated by the battery module is circulated through the coolant of the energy storage liquid flow network and exchanges heat with the coolant on the accumulator side through the multi - chamber heat exchanger, thereby completing the cooling of the battery. Specifically: Control the opening and closing of the switch valve group to make the coolant on the accumulator side circulate in the accumulator and the third heat exchange chamber. 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; Mode 7: Natural cooling mode of the water storage tank. The heat generated by the battery is circulated through the coolant of the energy storage liquid flow network and exchanges heat between the coolant on the battery side and the coolant on the water storage tank side through the multi - chamber heat exchanger to complete the battery cooling; In the multi - chamber heat exchanger, the coolant carrying the heat generated by the battery transfers the heat to the coolant on the water storage tank side, and the temperature of the coolant in the water storage tank is reduced through natural cooling to achieve the purpose of cooling the battery; Mode 8: Refrigeration mode of the heat pump system. In the cooling condition for the battery, the heat pump system is in the refrigeration mode. The refrigerant is compressed by the compressor, enters the outdoor heat exchanger through the four - way valve for condensation and heat release, is throttled and depressurized by the second throttle valve, and enters the second heat exchange chamber. At this time, it absorbs the coolant of the energy storage liquid flow network carrying the heat generated by the battery, and the refrigerant vaporizes and absorbs heat to complete the cooling of the coolant on the battery side; Mode 9: Air environment heating mode of the heat pump system. The heat pump system is in the heating mode. At this time, during the compression process of the refrigerant by the compressor, it passes through the four - way valve and reverses to enter the indoor heat exchanger for condensation and heat release. At this time, it heats the air environment on the battery side. After being throttled and depressurized by the first throttle valve, it enters the outdoor heat exchanger, and the refrigerant vaporizes and absorbs heat to complete the cycle; Mode Ten: Air environment refrigeration mode of the heat pump system. When cooling the battery, the heat pump system is in the refrigeration mode. At this time, the refrigerant enters the outdoor heat exchanger through the compressor, condenses and releases heat, and discharges the heat to the outdoor environment. Then, after throttling and depressurizing through the first throttle valve, the refrigerant enters the indoor heat exchanger, where the refrigerant vaporizes and absorbs heat to cool the air environment, thus completing the cycle.

9. A full-climate thermal management method for an energy storage power station with a cross-seasonal 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.

10. A full-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 the heat pump system for heating or refrigeration, the controller increases the heating / cooling capacity by controlling the compressor speed and the switching of the four-way valve; for the 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 speed of the indoor heat exchanger fan, the compressor speed, and the opening degrees 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 regulate the humidity.

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