Double-path fusion type energy storage liquid cooling system and alternating current and direct current integrated energy storage equipment

Abstract

The utility model relates to the technical field of energy storage heat management, and discloses a double-path fusion type energy storage liquid cooling system and alternating current and direct current integrated energy storage equipment. The system comprises a first management loop, a second management loop and a fusion branch. A refrigerant loop of the first management loop is used for carrying out cooling control on water liquid of the first water loop; a first heating device of the first water loop is used for carrying out temperature rise control on the water liquid, so that the temperature of the energy storage battery is controlled; a second water loop of the second management loop is connected with the first water loop through a fusion branch; when the fusion branch is in a disconnected state, the control loop performs heating or cooling control on the water liquid; and when the fusion branch is switched to the connected state, the water liquid of the first water loop and the control loop carry out temperature control on the water liquid of the second water loop, so that the temperature control is carried out on the energy storage converter. The management loops of the energy storage battery side and the energy storage converter side are organically combined through the fusion branch, and the energy efficiency of the energy storage liquid cooling system under different working conditions is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage thermal management technology, and in particular to a dual-path integrated energy storage liquid cooling system and an AC / DC integrated energy storage device. Background Art

[0002] Compared with AC / DC separated energy storage systems, the AC / DC integrated energy storage system can reduce the footprint by about 29%, realize battery cluster-level management, solve the short-board effect of inconsistent batteries, and at the same time reduce the conversion level and improve energy conversion efficiency, becoming a new trend in energy storage systems.

[0003] AC / DC energy storage includes energy storage batteries and energy storage converters; however, the liquid cooling unit of the AC / DC integrated energy storage system is simply connected in parallel with two systems. The control strategy of each system is relatively independent, and separate thermal management control is performed on the energy storage battery and energy storage converter respectively, resulting in low overall energy efficiency of the AC / DC integrated energy storage system. Utility Model Content

[0004] In view of this, the embodiments of the present application provide a dual-channel integrated energy storage liquid cooling system and an AC / DC integrated energy storage device, which can effectively solve the problem of low energy efficiency of energy storage thermal management.

[0005] In a first aspect, an embodiment of the present application provides a dual-path fusion energy storage liquid cooling system, comprising a first management circuit for temperature control of an energy storage battery, a second management circuit for temperature control of an energy storage converter, and a fusion branch;

[0006] The first management circuit includes a refrigerant circuit and a first water circuit; the refrigerant circuit is used to control the temperature of the water in the first water circuit; the first water circuit includes a first heating device, and the first heating device is used to control the temperature of the water in the first water circuit; the first management circuit controls the temperature of the energy storage battery based on the water temperature in the first water circuit;

[0007] The second management circuit includes a control circuit and a second water circuit, and the second water circuit is connected to the first water circuit through the fusion branch; when the fusion branch is in a disconnected state, the control circuit controls the temperature of the water liquid in the second water circuit to increase or decrease; when the fusion branch is in a connected state, the water liquid in the second water circuit is controlled to increase or decrease in temperature under the action of the water liquid in the first water circuit and the control circuit; the second management circuit controls the temperature of the energy storage converter based on the water temperature in the second water circuit.

[0008] In some embodiments, the fusion branch includes a first three-way valve, a second three-way valve, and a proportional valve;

[0009] The first end of the first tee and the second end of the first tee are connected to the first water circuit; the water liquid in the first water circuit flows through the first tee;

[0010] The first end of the second tee and the second end of the second tee are connected to the second water circuit; the water liquid in the second water circuit flows through the second tee;

[0011] The water inlet of the proportional valve is connected to the third end of the first tee, and the water outlet of the proportional valve is connected to the third end of the second tee; the proportional valve is used to control the flow rate of water liquid from the first water circuit to the water liquid of the second water circuit.

[0012] In some embodiments, the first water circuit further includes a first water pump; the water inlet of the first water pump is connected to the water outlet of the energy storage battery, the water outlet of the first water pump is connected to the first end of the first tee, the second end of the first tee is connected to the water inlet of the first heating device, and the water outlet of the first heating device is connected to the water inlet of the energy storage battery;

[0013] And / or, the second water circuit includes a second water pump; the water inlet of the second water pump is connected to the water outlet of the energy storage inverter; the water outlet of the second water pump is connected to the water inlet of the control circuit; the water outlet of the control circuit is connected to the first end of the second tee, and the second end of the second tee is connected to the water inlet of the energy storage inverter.

[0014] In some embodiments, the first water circuit further includes a fluid replenishment branch, the fluid replenishment branch including a fluid replenishment pump and a water tank; the fluid replenishment pump and the water tank are connected in series;

[0015] The water outlet of the infusion branch is connected to the water inlet of the first water pump; when the pressure detection value in the first water circuit is lower than the first set water pressure value, the infusion pump is in the open state to pump the water liquid in the infusion pump into the first water circuit; and when the pressure detection value in the first water circuit is higher than the second set water pressure value, the infusion pump is switched to the closed state; wherein the second set water pressure is greater than the first set water pressure.

[0016] In some embodiments, the dual-path fusion energy storage liquid cooling system further includes a return branch;

[0017] The water inlet of the return branch is connected to the water outlet of the energy storage converter, and the water outlet of the return branch is connected to the water outlet of the energy storage battery; when the water liquid flow rate is greater than zero, the excess water liquid in the second water circuit flows into the first water circuit through the return branch.

[0018] In some embodiments, the dual-path fusion energy storage liquid cooling system further includes a plate heat exchanger;

[0019] The first side of the plate heat exchanger is arranged in the refrigerant circuit; the second side of the plate heat exchanger is arranged in the first water circuit;

[0020] When the energy storage battery is subjected to temperature reduction control, the refrigerant gas in the refrigerant circuit exchanges heat with the water liquid in the first water circuit through the plate heat exchanger to perform temperature reduction control on the water liquid in the first water circuit.

[0021] In some embodiments, the refrigerant circuit further includes a compressor and a condensing branch;

[0022] The input end of the compressor is connected to the output end of the first side of the plate heat exchanger, and the output end of the compressor is connected to the input end of the condensation branch; the refrigerant gas output from the first side of the plate heat exchanger is compressed by the compressor and condensed by the condensation branch to obtain liquid refrigerant.

[0023] In some embodiments, the refrigerant circuit further includes a refrigerant pump, the input end of the refrigerant pump is connected to the output end of the condensation branch, and the refrigerant pump is used to pressurize the liquid refrigerant in the refrigerant circuit and output it to the input end of the first side of the plate heat exchanger.

[0024] In some embodiments, the control circuit includes a heat dissipation branch, a second heating device, and a three-way valve;

[0025] The water inlet of the heat dissipation branch and the water inlet of the second heating device are simultaneously connected to the water inlet of the control circuit, the water outlet of the heat dissipation branch is connected to the first water inlet of the three-way valve, the second heating device is connected to the second water inlet of the three-way valve, and the water outlet of the three-way valve is the water outlet of the control circuit;

[0026] When the first water inlet of the three-way valve is connected to the water outlet of the three-way valve, the water in the second water circuit flows through the heat dissipation branch; the heat dissipation branch is used to control the temperature of the water in the second water circuit;

[0027] When the second water inlet of the three-way valve is connected to the water outlet of the three-way valve, the water in the second water circuit flows through the second heating device; the second heating device is used to control the temperature of the water in the second water circuit.

[0028] In a second aspect, an embodiment of the present application provides an AC / DC integrated energy storage device, comprising an energy storage battery, an energy storage converter, and the above-mentioned dual-channel integrated energy storage liquid cooling system; the dual-channel integrated energy storage liquid cooling system is used to control the temperature of the energy storage battery and the energy storage converter respectively.

[0029] The embodiments of the present application have the following beneficial effects:

[0030] The dual-circuit fusion energy storage liquid cooling system of the present application includes a first management circuit, a second management circuit, and a fusion branch; the refrigerant circuit of the first management circuit controls the temperature of the water in the first water circuit; the first heating device of the first water circuit controls the temperature of the water in the first water circuit; so that the first management circuit controls the temperature of the energy storage battery based on the water temperature in the first water circuit; the control circuit of the second management circuit is used to control the temperature of the water in the second water circuit; when the fusion branch is in a disconnected state, the water in the second water circuit is controlled to be heated or cooled under the action of the control circuit; when the fusion branch is switched to a connected state, the water in the second water circuit is controlled to be heated or cooled under the action of the water in the first water circuit and the control circuit; so that the second management circuit controls the temperature of the energy storage converter based on the water temperature in the second water circuit. The present application organically combines and interacts the first management circuit of the energy storage battery PACK and the second management circuit of the energy storage converter PCS through the fusion branch, which can achieve the optimal energy efficiency of the energy storage liquid cooling system under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A principle block diagram of a dual-channel integrated energy storage liquid cooling system according to an embodiment of the present application is shown;

[0033] Figure 2 A structural schematic diagram of a dual-channel integrated energy storage liquid cooling system according to an embodiment of the present application is shown;

[0034] Figure 3 A schematic diagram illustrating the application of the dual-channel integrated energy storage liquid cooling system of an embodiment of the present application in an energy-saving cooling mode is shown;

[0035] Figure 4 A schematic diagram illustrating the application of the dual-channel integrated energy storage liquid cooling system of an embodiment of the present application in a hybrid cooling mode is shown;

[0036] Figure 5 A schematic diagram illustrating the application of the dual-channel integrated energy storage liquid cooling system of an embodiment of the present application in a mechanical cooling mode is shown;

[0037] Figure 6A schematic diagram illustrating the application of the dual-channel integrated energy storage liquid cooling system of an embodiment of the present application in a combined cooling mode is shown;

[0038] Figure 7 A first application schematic diagram of dew point temperature control on the energy storage converter side according to an embodiment of the present application is shown;

[0039] Figure 8 A second application schematic diagram of dew point temperature control on the energy storage converter side according to an embodiment of the present application is shown;

[0040] Figure 9 A schematic diagram of the application of the dual-channel integrated energy storage liquid cooling system in the heating mode of an embodiment of the present application is shown.

[0041] Description of main component symbols:

[0042] 1- compressor; 2- plate heat exchanger; 3- electronic expansion valve; 4- filter drier; 5- refrigerant pump; 6- liquid storage tank; 7- condenser; 8- condensing fan; 9- first water pump; 10- first heating device; 11- second water pump; 12- second heating device; 13- radiator; 14- cooling fan; 15- three-way valve; 16- proportional valve; 17- pressure relief valve; 18- water tank; 19- fluid replenishment pump; 20- first one-way valve; 21- expansion tank; 22- second one-way valve; 23- third one-way valve; 24- solenoid valve; 25- first three-way valve; 26- second three-way valve; 27- third three-way valve; 110- refrigerant circuit; 120- first water circuit; 210- control circuit; 220- second water circuit; 300- fusion branch. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0044] The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but rather merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0045] Hereinafter, the terms "including", "having" and their cognates used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the aforementioned items, and should not be understood as excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the aforementioned items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the aforementioned items. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and should not be understood as indicating or implying relative importance.

[0046] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present application.

[0047] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0048] The AC / DC integrated energy storage system in this application includes an energy storage battery PACK and an energy storage converter PCS. The energy storage battery PACK outputs DC, which can be one or more groups, and there is no limit on the number of energy storage battery PACKs; the energy storage converter PCS outputs AC; the energy storage battery PACK and the energy storage converter PCS are both temperature-controlled through a water circuit. Specifically, the first management circuit of the energy storage battery PACK and the second management circuit of the energy storage converter PCS are organically combined and interacted through a fusion branch to improve energy efficiency under different working conditions while ensuring that condensed water does not form inside the PCS.

[0049] The dual-path fusion energy storage liquid cooling system is described below with reference to some specific embodiments.

[0050] Figure 1 A principle block diagram of a dual-channel integrated energy storage liquid cooling system according to an embodiment of the present application is shown. Figure 2A schematic diagram of the structure of a dual-circuit integrated energy storage liquid cooling system according to an embodiment of the present application is shown. Exemplarily, the dual-circuit integrated energy storage liquid cooling system includes a first management circuit for temperature control of the energy storage battery, a second management circuit for temperature control of the energy storage converter, and a fusion branch 300. A section of the first water circuit 120 is located near the energy storage battery pack. For the section of water circuit located near the energy storage battery pack, the first end flowing toward the energy storage battery pack is defined as the water inlet of the energy storage battery pack, and the second end flowing out of the energy storage battery pack is defined as the water outlet of the energy storage battery pack. Similarly, the water inlet and water outlet of the energy storage converter PCS are defined.

[0051] The first management circuit includes a refrigerant circuit 110 and a first water circuit 120; the refrigerant circuit 110 is used to control the temperature of the water liquid in the first water circuit 120; the first water circuit includes a first heating device 10, and the first heating device 10 is used to control the temperature of the water liquid in the first water circuit 120; so that the first management circuit controls the temperature of the energy storage battery PACK based on the water temperature in the first water circuit 120; the second management circuit includes a control circuit 210 and a second water circuit 220, and the second water circuit 220 is connected to the first water circuit 120 through a fusion branch 300 ; The control circuit 210 is used to control the temperature of the water liquid in the second water circuit 220 to increase or decrease. When the fusion branch 300 is in the disconnected state, the temperature of the water liquid in the second water circuit 220 is increased or decreased under the action of the control circuit 210. When the fusion branch 300 is switched to the connected state, the temperature of the water liquid in the first water circuit 120 and the control circuit 210 is increased or decreased, so that the second management circuit can control the temperature of the energy storage converter PCS based on the water temperature in the second water circuit 220.

[0052] This application organically combines and interacts the first management loop of the energy storage battery PACK and the second management loop of the energy storage converter PCS through the fusion branch, thereby achieving optimal energy efficiency under different working conditions.

[0053] In some embodiments of the present application, the fusion branch 300 includes a first tee 25, a second tee 26 and a proportional valve 16; the first end of the first tee 25 and the second end of the first tee 25 are connected to the first water circuit 120; the water liquid in the first water circuit 120 flows through the first tee 25; the first end of the second tee 26 and the second end of the second tee 26 are connected to the second water circuit 220; the water liquid in the second water circuit 220 flows through the second tee 26; the water inlet of the proportional valve 16 is connected to the third end of the first tee 25, and the water outlet of the proportional valve is connected to the third end of the second tee 26; the proportional valve 16 is used to control the water liquid flow rate of the first water circuit 120 to the second water circuit 220.

[0054] In the present application, the proportional valve controls the water liquid flow rate according to the size of the opening ratio. When the proportional valve 16 is not open, the water liquid in the first water circuit 120 cannot flow to the second water circuit 220, and the water liquid flow rate is zero at this time; when the proportional valve 16 is open, the water liquid in the first water circuit 120 flows to the second water circuit 220, and the water liquid flow rate is V at this time, where V is greater than zero, and the water flow rate V increases as the opening of the proportional valve increases.

[0055] After the proportional valve 16 is opened, the water liquid in the first water circuit 120 flows to the second water circuit 220. Due to the increase in the water inflow in the second water circuit 220, the excess water liquid needs to be discharged. Therefore, a reflux branch is added to the second water circuit 220; therefore, in some embodiments of the present application, the second water circuit 220 includes a reflux branch; the water inlet of the reflux branch is connected to the water outlet of the energy storage converter PCS; the water outlet of the reflux branch is connected to the water outlet of the energy storage battery and the expansion tank 21; when the water liquid flow rate is greater than zero, the excess water liquid in the second water circuit 220 is discharged through the reflux branch and circulated into the first water circuit 120; the water inlet of the second water pump 11 is connected to the water outlet of the energy storage converter PCS; the water outlet of the second water pump 11 is connected to the water inlet of the control circuit 210; the water outlet of the control circuit 210 is connected to the first end of the second tee 26, and the second end of the second tee 26 is connected to the water inlet of the energy storage converter PCS. The reflux branch includes an expansion tank 21 for storing the water liquid discharged from the reflux branch.

[0056] In some embodiments of the present application, the first water circuit 120 includes a first water pump 9; the water inlet of the first water pump 9 is connected to the water outlet of the energy storage battery pack, the water outlet of the first water pump 9 is connected to the first end of the first tee 25, the second end of the first tee 25 is connected to the water inlet of the first heating device 10, and the water outlet of the first heating device 10 is connected to the water inlet of the energy storage battery pack. Under the action of the first water pump 9, the water in the first water circuit 120 circulates; the first heating device uses electrical heating to quickly heat the water in the first water circuit 120.

[0057] In some embodiments of the present application, the second water circuit 220 includes a second water pump 11. The water inlet of the second water pump 11 is connected to the water outlet of the energy storage converter PCS; the water outlet of the second water pump 11 is connected to the water inlet of the control circuit 210; the water outlet of the control circuit 210 is connected to the first end of the second tee 26, and the second end of the second tee 26 is connected to the water inlet of the energy storage converter PCS. Under the action of the control circuit 210, the second water circuit 220 controls the temperature of the water in the second water circuit 220.

[0058] In some embodiments of the present application, the dual-path fusion energy storage liquid cooling system further includes a plate heat exchanger 2; the first side of the plate heat exchanger 2 is arranged in the refrigerant circuit 110; the second side of the plate heat exchanger 2 is arranged in the first water circuit 120; when the energy storage battery PACK is cooled, the refrigerant gas in the refrigerant circuit 110 is heat-exchanged with the water liquid in the first water circuit 120 through the plate heat exchanger 2 to cool the water liquid in the first water circuit 120.

[0059] The plate heat exchanger 2 in the present application is an evaporator, and the refrigerant gas on the first side of the plate heat exchanger exchanges heat with the water liquid on the second side of the plate heat exchanger, thereby achieving temperature reduction control of the water liquid in the first water circuit 120.

[0060] In some embodiments of the present application, the first water circuit also includes a fluid replenishment branch, which includes a fluid replenishment pump 19 and a water tank 18; the fluid replenishment pump 19 and the water tank 18 are connected in series; the water outlet of the fluid replenishment branch is connected to the water inlet of the first water pump 9; when the pressure detection value in the first water circuit 120 is lower than the first set water pressure value, the fluid replenishment pump 19 is in an open state to pump the water liquid in the fluid replenishment pump 19 into the first water circuit 120; and when the pressure detection value in the first water circuit 120 is higher than the second set water pressure value, the fluid replenishment pump 19 is switched to a closed state; wherein the second set water pressure is greater than the first set water pressure.

[0061] To assist in controlling the rehydration branch, the rehydration branch also includes a pressure relief valve 17, a first one-way valve 20, and a third three-way valve 27. The pressure relief valve 17 is connected to the water inlet of the first heating device 10. When the pressure detection value in the first water circuit 120 is lower than the first set water pressure value, the pressure relief valve 17 opens to change the pressure in the water tank 18. At the same time, the rehydration pump 19 and the first one-way valve are opened. Under the action of the rehydration pump 19, the water liquid in the water tank 18 is pumped into the first water circuit 120 to replenish the water liquid in the first water circuit 120. When the pressure detection value in the first water circuit 120 is higher than the second set water pressure value, the rehydration pump 19 switches to the off state and stops rehydration. The water tank 18 is specifically an expansion tank.

[0062] In some embodiments of the present application, the refrigerant circuit 110 further includes a compressor 1, a condensation branch, and an electronic expansion valve 3; the input end of the compressor 1 is connected to the output end of the first side of the plate heat exchanger, and the output end of the compressor 1 is connected to the input end of the condensation branch; the output end of the condensation branch is connected to the input end of the electronic expansion valve 3, and the output end of the electronic expansion valve 3 is connected to the input end of the plate heat exchanger 2; the refrigerant gas output from the first side of the plate heat exchanger is compressed by the compressor 1 and condensed by the condensation branch to obtain liquid refrigerant; the liquid refrigerant is then expanded by the electronic expansion valve 3 and evaporated by the plate heat exchanger 2 to obtain refrigerant gas. The refrigerant circuit of the present application adopts the compressor refrigeration principle, that is, based on the phase change process of the refrigerant, heat transfer and cooling effect are achieved through four basic steps of compression, condensation, expansion and evaporation.

[0063] In a specific implementation, the condensation branch includes a condenser 7, a condensation fan 8 and a liquid storage tank 6. The condenser 7 and the condensation fan 8 condense and cool the refrigerant gas in the refrigerant circuit 110, thereby obtaining liquid refrigerant that flows into the liquid storage tank 6.

[0064] In another embodiment of the present application, the refrigerant circuit 110 also includes a second one-way valve 22, the input end of the second one-way valve 22 is connected to the input end of the compressor 1, and the output end of the second one-way valve 22 is connected to the output end of the compressor 1, that is, the compressor 1 and the second one-way valve 22 are connected in parallel, so the refrigerant circuit 110 can transmit the refrigerant gas to the condensation branch through the compressor 1 or the second one-way valve 22.

[0065] In some embodiments of the present application, the refrigerant circuit also includes a refrigerant pump 5, the input end of the refrigerant pump 5 is connected to the output end of the condensation branch, and the refrigerant pump is used to pressurize the liquid refrigerant in the refrigerant circuit and output it to the input end of the first side of the plate heat exchanger.

[0066] In another embodiment of the present application, the refrigerant circuit 110 also includes a third one-way valve 23, the input end of the third one-way valve 23 is connected to the input end of the refrigerant pump 5, and the output end of the third one-way valve 23 is connected to the output end of the refrigerant pump 5, that is, the third one-way valve 23 and the refrigerant pump 5 are connected in parallel, so the refrigerant circuit 110 can return the liquid refrigerant to the plate heat exchanger 2 through the electronic expansion valve 3 through the refrigerant pump 5 or the third one-way valve 23.

[0067] In another embodiment of the present application, the refrigerant circuit 110 also includes a drying filter 4 and a solenoid valve 24; the input end of the drying filter 4 is connected to the output end of the refrigerant pump 5 and the third one-way valve 23, and the output end of the drying filter 4 is connected to the input end of the electronic expansion valve 3. The drying filter 4 dries the liquid refrigerant and then transfers it to the electronic expansion valve 3 for expansion; the input end of the electronic valve 24 is connected to the output end of the electronic expansion valve 3, and the output end of the electronic valve 24 is connected to the input end of the first side of the plate heat exchanger; the electronic valve 24 transfers the expanded refrigerant to the plate heat exchanger 2.

[0068] In some embodiments of the present application, the control circuit 210 includes a heat dissipation branch, a second heating device 12 and a three-way valve 15; the water inlet of the heat dissipation branch and the water inlet of the second heating device 12 are simultaneously connected to the water inlet of the control circuit 210, the water outlet of the heat dissipation branch is connected to the first water inlet of the three-way valve 15, the second heating device 12 is connected to the second water inlet of the three-way valve 15, and the water outlet of the three-way valve 15 is the water outlet of the control circuit 210; when the first water inlet of the three-way valve 15 is connected to the water outlet of the three-way valve 15, the water liquid in the second water circuit 220 flows through the heat dissipation branch; the heat dissipation branch is used to control the temperature of the water liquid in the second water circuit 220; when the second water inlet of the three-way valve 15 is connected to the water outlet of the three-way valve 15, the water liquid in the second water circuit 220 flows through the second heating device 12; the second heating device 12 is used to control the temperature of the water liquid in the second water circuit 220.

[0069] The heat dissipation branch of the present application includes a radiator 13 and a heat dissipation fan 14; when the fusion branch 300 is in a connected state, the second management circuit controls the temperature of the water liquid in the second water circuit 220 through the heat dissipation branch of the control circuit 210, and controls the temperature of the water liquid in the second water circuit 220 through the second heating device 12; when the fusion branch 300 is in a disconnected state, the second management circuit jointly controls the temperature of the water liquid in the second water circuit 220 under the heat dissipation effect of the water temperature of the first water circuit 120 and the heat dissipation branch, and jointly controls the temperature of the water liquid in the second water circuit 220 under the heating effect of the water temperature of the first water circuit 120 and the second heating device 12; the second management circuit realizes temperature control of the energy storage converter PCS based on the water temperature of the water liquid in the second water circuit 220 after heating or cooling control.

[0070] In some embodiments of the present application, the water liquid in the second water circuit 220 uses ethylene glycol as a solvent, and ethylene glycol can play an antifreeze role, thereby ensuring that condensed water does not form inside the energy storage converter PCS.

[0071] The dual-path fusion energy storage liquid cooling system of the present application organically combines and interacts the first management circuit of the energy storage battery PACK and the second management circuit of the energy storage converter PCS through a fusion branch, thereby achieving optimal energy efficiency under different working conditions; for different working conditions, the system adopts different working modes.

[0072] When the ambient temperature Ta≤0°C, the dual-circuit fusion energy storage liquid cooling system is in energy-saving refrigeration mode. In energy-saving refrigeration mode, the refrigerant pump 5 works to pressurize the liquid refrigerant and exchanges heat between the refrigerant in the refrigerant circuit 110 and the water in the first water circuit 120 through the plate heat exchanger 2 to cool the water in the first water circuit 120, thereby controlling the temperature of the energy storage battery PACK; at the same time, the heat dissipation unit dissipates heat and cools the water in the second water circuit 220, thereby controlling the temperature of the energy storage converter PCS; Figure 3 As shown; on the energy storage battery PACK side, the compressor 1 is controlled to be in the closed state, the refrigerant pump 5 and the solenoid valve 24 are opened, and the refrigerant passes through the plate heat exchanger 2-the second one-way valve 22-the condensation branch (condenser 7)-the liquid storage tank 6-the refrigerant pump 5-the drying filter 4-the electronic expansion valve 3-the solenoid valve 24-the plate heat exchanger 2 in sequence, and the refrigerant circuit 110 pressurizes the liquid refrigerant through the refrigerant pump 5; the first heating device 10 in the first water circuit 120 is in the closed state, and the water liquid in the first water circuit 120 of the coolant passes through the water outlet of the energy storage battery PACK-the first water pump 9-the plate heat exchanger 2-the first heating device 10-the energy storage battery PACK in sequence. Battery PACK water inlet; under the heat exchange action of the refrigerant circuit 110, the temperature of the water liquid in the first water circuit 120 is reduced. When flowing through the energy storage battery PACK, the water liquid in the first water circuit 120 and the heat generated by the energy storage battery are heat-exchanged again to achieve the cooling effect of the energy storage battery PACK; at the same time, the heat dissipation branch on the energy storage inverter PCS side is opened, the second heating device 12 is closed, and the aqueous solution with ethylene glycol as the solvent in the second water circuit 220 passes through the energy storage inverter PCS water outlet-the second water pump 11-the heat dissipation branch-the three-way valve 15-the second three-way valve 26-the energy storage inverter PCS water inlet in sequence.

[0073] When the ambient temperature is 0℃<Ta≤T1, the dual-path fusion energy storage liquid cooling system is in a hybrid cooling mode; T1 in the example of this application is 12℃, and as other examples, it can also be 11℃ or 13℃, etc.; when the energy storage liquid cooling system is in a hybrid cooling mode, the refrigerant pump 5 and the compressor 1 work simultaneously, the refrigerant pump 5 pressurizes the liquid refrigerant, the compressor 1 compresses the refrigerant gas, and exchanges heat between the refrigerant in the refrigerant circuit 110 and the water liquid in the first water circuit 120 through the plate heat exchanger 2 to cool the water liquid in the first water circuit 120, thereby controlling the temperature of the energy storage battery PACK; at the same time, the heat dissipation unit dissipates heat and cools the water liquid in the second water circuit 220, thereby controlling the temperature of the energy storage converter PCS; as Figure 4 As shown; on the energy storage battery PACK side, the compressor 1, the refrigerant pump 5 and the solenoid valve 24 are controlled to be turned on; the refrigerant passes through the plate heat exchanger 2-compressor 1 and the second one-way valve 22-condensation branch (condenser 7)-liquid storage tank 6-refrigerant pump 5 and the third one-way valve 23-drying filter 4-electronic expansion valve 3-solenoid valve 24-plate heat exchanger 2 in sequence, and the refrigerant circuit 110 compresses the refrigerant gas through the compressor 1 and pressurizes the liquid refrigerant through the refrigerant pump 5 in sequence; the first heating device 10 in the first water circuit 120 is in the closed state, and the water liquid in the first water circuit 120 of the coolant passes through the water outlet of the energy storage battery PACK-the first water pump 9-plate heat exchanger 2-the A heating device 10 is connected to the water inlet of the energy storage battery PACK. Under the heat exchange effect of the refrigerant circuit 110, the temperature of the water liquid in the first water circuit 120 is reduced. When flowing through the energy storage battery PACK, the water liquid in the first water circuit 120 and the heat generated by the energy storage battery are heat-exchanged again to achieve the cooling effect of the energy storage battery PACK. At the same time, the heat dissipation branch on the energy storage inverter PCS side is opened, the second heating device 12 is closed, and the aqueous solution with ethylene glycol as the solvent in the second water circuit 220 passes through the water outlet of the energy storage inverter PCS, the second water pump 11, the heat dissipation branch, the three-way valve 15, the second three-way valve 26, and the water inlet of the energy storage inverter PCS in sequence.

[0074] When the ambient temperature Ta>T1, the dual-circuit integrated energy storage liquid cooling system is in the mechanical refrigeration mode; when the energy storage liquid cooling system is in the mechanical refrigeration mode, the compressor 1 works, the compressor 1 compresses the refrigerant gas, and exchanges heat between the refrigerant in the refrigerant circuit 110 and the water liquid in the first water circuit 120 through the plate heat exchanger 2, so as to cool the water liquid in the first water circuit 120, thereby controlling the temperature of the energy storage battery PACK; at the same time, the heat dissipation unit dissipates heat and cools the water liquid in the second water circuit 220, thereby controlling the temperature of the energy storage converter PCS; Figure 5As shown; on the energy storage battery PACK side, the compressor 1 and the solenoid valve 24 are controlled to be open; the refrigerant passes through the plate heat exchanger 2-compressor 1-condensation branch (condenser 7)-liquid storage tank 6-third one-way valve 23-drying filter 4-electronic expansion valve 3-solenoid valve 24-plate heat exchanger 2 in sequence, and the refrigerant circuit 110 compresses the refrigerant gas through the compressor 1; the first heating device 10 in the first water circuit 120 is in the closed state, and the water liquid in the first refrigerant water circuit 120 passes through the energy storage battery PACK outlet-first water pump 9-plate heat exchanger 2-first heating device 10-energy storage battery PACK water inlet in sequence. Inlet; under the heat exchange effect of the refrigerant circuit 110, the temperature of the water liquid in the first water circuit 120 is reduced. When flowing through the energy storage battery PACK, the water liquid in the first water circuit 120 and the heat generated by the energy storage battery are heat-exchanged again to achieve the cooling effect of the energy storage battery PACK; at the same time, the heat dissipation branch on the energy storage converter PCS side is opened, the second heating device 12 is closed, and the aqueous solution with ethylene glycol as the solvent in the second water circuit 220 passes through the energy storage converter PCS outlet - the second water pump 11 - the heat dissipation branch - the three-way valve 15 - the second three-way valve 26 - the energy storage converter PCS water inlet in sequence.

[0075] When the ambient temperature Ta>T2, the dual-channel fusion energy storage liquid cooling system is in the joint cooling mode; T2 in the example of this application is 50°C, and as other examples, it can also be 52°C or 55°C, etc.; the ambient temperature Ta>T2, that is, the ambient temperature is too high, and the energy storage converter PCS only dissipates heat and cools down through the heat dissipation unit, which may cause insufficient heat dissipation. In order to ensure that the water inlet temperature of the energy storage converter PCS (hereinafter referred to as the PCS inlet temperature) is less than the maximum protection value Tpmax, when the water inlet temperature of the energy storage converter PCS is greater than Tpmax-5°C, the control fusion branch 300 is in the on state (proportional valve 16 is open). Start), the compressor 1 on the energy storage battery PACK side works, the compressor 1 compresses the refrigerant gas, and exchanges heat between the refrigerant in the refrigerant circuit 110 and the water liquid in the first water circuit 120 through the plate heat exchanger 2, so as to cool the water liquid in the first water circuit 120, thereby controlling the temperature of the energy storage battery PACK; under the conduction effect of the fusion branch 300, the water liquid in the first water circuit 120 flows into the second water circuit 220 after cooling. At this time, the heat dissipation unit and the first water circuit 120 jointly cool the water liquid in the second water circuit 220, thereby controlling the temperature of the energy storage converter PCS; Figure 6As shown; on the energy storage battery PACK side, the compressor 1 and the solenoid valve 24 are controlled to be turned on; the refrigerant passes through the plate heat exchanger 2-compressor 1-condensation branch (condenser 7)-liquid storage tank 6-third one-way valve 23-drying filter 4-electronic expansion valve 3-solenoid valve 24-plate heat exchanger 2 in sequence, and the refrigerant circuit 110 compresses the refrigerant gas through the compressor 1; the first heating device 10 in the first water circuit 120 is in a closed state, and the water liquid in the first water circuit 120 of the refrigerant passes through the water outlet of the energy storage battery PACK-the first water pump 9-plate heat exchanger 2-the first three-way valve 25 (the water liquid in the first water circuit 120 is diverted to the fusion branch 300)-the first heating device 10-the water inlet of the energy storage battery PACK in sequence; the first water circuit 12 Under the heat exchange effect of the refrigerant circuit 110, the temperature of the water in the first water circuit 120 decreases. When flowing through the energy storage battery pack, the water in the first water circuit 120 again exchanges heat with the heat generated by the energy storage battery pack, thereby achieving a cooling effect on the energy storage battery pack. At the same time, the heat dissipation branch on the energy storage converter PCS side is opened, the proportional valve 16 of the fusion branch 300 is opened, and the second heating device 12 is closed. The aqueous solution containing ethylene glycol as the solvent in the second water circuit 220 passes through the energy storage converter PCS outlet, the second water pump 11, the heat dissipation branch, the three-way valve 15, the second three-way valve 26 (the water flowing out of the heat dissipation branch and the water flowing out of the first water circuit 120 by diversion), and the water inlet of the energy storage converter PCS.

[0076] Because the water pressure on the energy storage battery PACK side is always greater than the water pressure on the energy storage converter PCS side, the low-temperature water in the first water circuit 120 on the energy storage battery PACK side flows into the second water circuit 220 on the energy storage converter PCS side. After the water diverted from the first water circuit 120 mixes with the water in the second water circuit 220, the inlet water temperature on the energy storage converter PCS side decreases. However, the total amount of water on the PCS side increases, and then returns to the first water circuit 120 of the energy storage battery PACK through the expansion tank 21, maintaining a relative balance in the water volume and pressure on the energy storage battery PACK side and the energy storage converter PCS side. The opening of the proportional valve 16 in the fusion branch 300 is controlled with the inlet water temperature Tpmax-2°C on the PCS side as the target to achieve precise PI control.

[0077] Regardless of the cooling mode, the integrated AC / DC energy storage system's management system (EMS) monitors the temperature and humidity inside the energy storage converter (PCS) in real time and calculates the dew point temperature (Tdew). By monitoring and regulating the PCS's inlet water temperature, it ensures that the dew point temperature remains above Tdew. The dew point temperature (Tdew) is the temperature at which the air, when unsaturated, reaches saturation with water vapor by lowering its temperature, expressed in degrees Celsius. The higher the water vapor content in the air, the higher the dew point temperature.

[0078] When it is detected that the water inlet temperature of the energy storage converter PCS is greater than the dew point temperature Tdew+5°C, the first water inlet of the three-way valve 15 is controlled to be connected with the water outlet of the three-way valve 15, so that the heat dissipation branch can normally cool the water liquid of the energy storage converter PCS, thereby achieving the effect of cooling the energy storage converter PCS; at this time, the first water inlet of the three-way valve 15 is connected with the water outlet of the three-way valve 15, as shown in FIG. Figure 7 As shown, the circulation on the PCS side of the energy storage converter is sequentially: the PCS water outlet - the second water pump 11 - the heat dissipation branch - the three-way valve 15 - the second three-way valve 26 - the PCS water inlet of the energy storage converter.

[0079] When it is detected that the inlet water temperature of the energy storage converter PCS is greater than the dew point temperature Tdew+3°C, the second water inlet of the three-way valve 15 is controlled to be connected to the water outlet of the three-way valve 15 to disconnect the heat dissipation branch, and the second heating device 12 is connected but not started, that is, the heat dissipation branch is prevented from continuing to cool the water liquid of the energy storage converter PCS, and the water liquid of the second water circuit 220 is naturally cooled by the second heating device 12 to prevent the water liquid temperature of the second water circuit 220 from dropping too quickly to reach the dew point temperature Tdew; at this time, if Figure 8 As shown, the circulation on the PCS side of the energy storage converter is sequentially: the PCS water outlet - the second water pump 11 - the second heating device 12 - the three-way valve 15 - the second three-way valve 26 - the PCS water inlet of the energy storage converter.

[0080] When it is detected that the water inlet temperature of the energy storage converter PCS is greater than the dew point temperature Tdew+1°C, the second water inlet of the three-way valve 15 is controlled to be connected with the water outlet of the three-way valve 15 so that the heat dissipation branch is disconnected and the second heating device 12 is connected and turned on. Figure 8 The water liquid circulation path on the energy storage converter PCS side remains unchanged, but the second heating device 12 is turned on to control the temperature of the water liquid in the second water circuit 220, effectively preventing the water liquid in the energy storage converter PCS from continuing to cool to the dew point temperature.

[0081] The heating function needs to be started in a low-temperature environment. Since the overall heat capacity of the water circuit and components on the PCS side of the energy storage inverter is relatively small, while the overall heat capacity of the water circuit and battery cells on the PACK side of the energy storage battery is relatively large, it is necessary to balance the heating of the two circuits to speed up the startup of the energy storage system. Therefore, when the dual-channel fusion energy storage liquid cooling system is in the heating mode, the second water circuit 220 of the energy storage inverter PCS and the first water circuit 120 of the energy storage battery PACK are linked and controlled, that is, the proportional valve 16 in the fusion branch 300 is controlled to be in a conductive state and the proportional valve 16 is opened to the maximum, and the first heating device 10 and the second heating device 12 are turned on; and when the battery cell temperature of the energy storage battery is greater than the first set temperature value, the opening of the proportional valve becomes smaller, and when the battery cell temperature of the energy storage battery is greater than the second set temperature value, the opening of the proportional valve is zero, that is, the proportional valve 16 is completely closed, wherein the second set temperature value is greater than the first set temperature value. As Figure 9 As shown, one branch of the first water circuit 120 on the energy storage battery PACK side passes through the energy storage battery PACK outlet, the third tee 27, the first water pump 9, the plate heat exchanger 2, the first tee 25, the first heating device 10, and the energy storage battery PACK inlet in sequence. Another branch of the first water circuit 120 on the energy storage battery PACK side passes through the energy storage battery PACK outlet, the first water pump 9, the plate heat exchanger 2, the first tee 25, the proportional valve 16, the energy storage converter PCS inlet, the energy storage converter PCS outlet, the expansion tank, the third tee 27, and the first water pump 9 in sequence. In this process, the first heating device 10 and the second heating device 12 simultaneously heat the water liquid in the first water circuit 120 to quickly heat the energy storage battery PACK. ; During the heating process, when the battery cell temperature of the energy storage battery is greater than the first set temperature value, the proportional valve 16 is closed by half, that is, 1 / 2 opening. In this process, the first heating device 10 and the second heating device 12 simultaneously heat the water liquid in the first water circuit 120 and reduce the heating speed to prevent it from exceeding a certain temperature value; when the battery cell temperature of the energy storage battery is greater than the second set temperature value, the opening of the proportional valve is zero. In this process, the first heating device 10 heats the water liquid in the first water circuit 120, and the second heating device 12 heats the water liquid in the second water circuit 220, so that the battery cell temperature of the energy storage battery PACK and the internal temperature of the energy storage converter PCS can meet their respective starting temperature requirements at the same time, so that the low-temperature starting time of the AC / DC integrated energy storage equipment can be saved by about 20%.

[0082] During the high-temperature cooling process, when the heat dissipation on the PCS side of the energy storage inverter is insufficient, the energy storage battery PACK can share the cooling capacity with the PCS side of the energy storage inverter to ensure that the energy storage liquid cooling control system does not operate at a reduced rating. During low ambient temperature startup, the startup speed is accelerated by about 20% through the control of the proportional valve. In addition, the inlet water temperature on the PCS side of the energy storage inverter is controlled in real time to be higher than the dew point temperature to ensure that no condensation occurs inside the PCS of the energy storage inverter. This application organically combines and interacts the first management circuit of the energy storage battery PACK and the second management circuit of the energy storage inverter PCS through a fusion branch, which can achieve the optimal energy efficiency of the energy storage liquid cooling system under different working conditions.

[0083] The present application also provides an AC / DC integrated energy storage device including an energy storage battery, an energy storage converter, and a dual-channel fusion energy storage liquid cooling system;

[0084] The dual-channel integrated energy storage liquid cooling system is used to control the temperature of the energy storage battery and the energy storage converter separately.

[0085] It can be understood that the options in the above embodiment are also applicable to this embodiment, so they will not be described again here.

[0086] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the structural diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or flow chart, and the combination of boxes in the structure diagram and / or flow chart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0087] In addition, the functional modules or units in the various embodiments of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0088] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a smart phone, personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application.

[0089] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application.

Claims

1. A dual-channel fusion energy storage liquid cooling system, characterized in that: It includes a first management circuit for controlling the temperature of the energy storage battery, a second management circuit for controlling the temperature of the energy storage converter, and a fusion branch; The first management circuit includes a refrigerant circuit and a first water circuit; the refrigerant circuit is used to control the temperature of the water in the first water circuit; the first water circuit includes a first heating device, and the first heating device is used to control the temperature of the water in the first water circuit; the first management circuit controls the temperature of the energy storage battery based on the water temperature in the first water circuit; The second management circuit includes a control circuit and a second water circuit, and the second water circuit is connected to the first water circuit through the fusion branch; when the fusion branch is in a disconnected state, the control circuit controls the temperature of the water liquid in the second water circuit to increase or decrease; when the fusion branch is in a connected state, the water liquid in the second water circuit is controlled to increase or decrease in temperature under the action of the water liquid in the first water circuit and the control circuit; the second management circuit controls the temperature of the energy storage converter based on the water temperature in the second water circuit.

2. The dual-channel fusion energy storage liquid cooling system according to claim 1 is characterized in that: The fusion branch includes a first three-way valve, a second three-way valve and a proportional valve; The first end of the first tee and the second end of the first tee are connected to the first water circuit; the water liquid in the first water circuit flows through the first tee; The first end of the second tee and the second end of the second tee are connected to the second water circuit; the water liquid in the second water circuit flows through the second tee; The water inlet of the proportional valve is connected to the third end of the first tee, and the water outlet of the proportional valve is connected to the third end of the second tee; the proportional valve is used to control the flow rate of water liquid from the first water circuit to the water liquid of the second water circuit.

3. The dual-channel fusion energy storage liquid cooling system according to claim 2 is characterized in that: The first water circuit further includes a first water pump; the water inlet of the first water pump is connected to the water outlet of the energy storage battery, the water outlet of the first water pump is connected to the first end of the first tee, the second end of the first tee is connected to the water inlet of the first heating device, and the water outlet of the first heating device is connected to the water inlet of the energy storage battery; And / or, the second water circuit includes a second water pump; the water inlet of the second water pump is connected to the water outlet of the energy storage inverter; the water outlet of the second water pump is connected to the water inlet of the control circuit; the water outlet of the control circuit is connected to the first end of the second tee, and the second end of the second tee is connected to the water inlet of the energy storage inverter.

4. The dual-channel fusion energy storage liquid cooling system according to claim 3 is characterized in that: The first water circuit further includes a liquid replenishment branch, which includes a liquid replenishment pump and a water tank; the liquid replenishment pump and the water tank are connected in series; The water outlet of the infusion branch is connected to the water inlet of the first water pump; when the pressure detection value in the first water circuit is lower than the first set water pressure value, the infusion pump is in the open state to pump the water liquid in the infusion pump into the first water circuit; and when the pressure detection value in the first water circuit is higher than the second set water pressure value, the infusion pump is switched to the closed state; wherein the second set water pressure is greater than the first set water pressure.

5. The dual-channel integrated energy storage liquid cooling system according to claim 1, characterized in that: The dual-path fusion energy storage liquid cooling system further includes a return branch; The water inlet of the return branch is connected to the water outlet of the energy storage converter, and the water outlet of the return branch is connected to the water outlet of the energy storage battery; When the water liquid flow rate is greater than zero, excess water liquid in the second water circuit flows into the first water circuit through the reflux branch.

6. The dual-channel integrated energy storage liquid cooling system according to claim 1, characterized in that: The dual-path fusion energy storage liquid cooling system also includes a plate heat exchanger; The first side of the plate heat exchanger is arranged in the refrigerant circuit; the second side of the plate heat exchanger is arranged in the first water circuit; When the energy storage battery is subjected to temperature reduction control, the refrigerant gas in the refrigerant circuit exchanges heat with the water liquid in the first water circuit through the plate heat exchanger to perform temperature reduction control on the water liquid in the first water circuit.

7. The dual-channel fusion energy storage liquid cooling system according to claim 6, characterized in that: The refrigerant circuit also includes a compressor and a condensation branch; The input end of the compressor is connected to the output end of the first side of the plate heat exchanger, and the output end of the compressor is connected to the input end of the condensation branch; the refrigerant gas output from the first side of the plate heat exchanger is compressed by the compressor and condensed by the condensation branch to obtain liquid refrigerant.

8. The dual-channel integrated energy storage liquid cooling system according to claim 7, characterized in that: The refrigerant circuit also includes a refrigerant pump, the input end of the refrigerant pump is connected to the output end of the condensation branch, and the refrigerant pump is used to pressurize the liquid refrigerant in the refrigerant circuit and output it to the input end of the first side of the plate heat exchanger.

9. The dual-channel integrated energy storage liquid cooling system according to claim 1, characterized in that: The control circuit includes a heat dissipation branch, a second heating device and a three-way valve; The water inlet of the heat dissipation branch and the water inlet of the second heating device are simultaneously connected to the water inlet of the control circuit, the water outlet of the heat dissipation branch is connected to the first water inlet of the three-way valve, the second heating device is connected to the second water inlet of the three-way valve, and the water outlet of the three-way valve is the water outlet of the control circuit; When the first water inlet of the three-way valve is connected to the water outlet of the three-way valve, the water in the second water circuit flows through the heat dissipation branch; the heat dissipation branch is used to control the temperature of the water in the second water circuit; When the second water inlet of the three-way valve is connected to the water outlet of the three-way valve, the water in the second water circuit flows through the second heating device; the second heating device is used to control the temperature of the water in the second water circuit.

10. An AC / DC integrated energy storage device, characterized in that: Comprising an energy storage battery, an energy storage converter and a dual-channel fusion energy storage liquid cooling system according to any one of claims 1 to 9; The dual-path fusion energy storage liquid cooling system is used to control the temperature of the energy storage battery and the energy storage converter respectively.

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