Dual-temperature zone liquid cooling thermal management system, operation method, and energy storage system using the same

Abstract

The present invention discloses a dual-temperature zone liquid-cooled thermal management system, an operating method, and an energy storage system using the same, which includes a first temperature zone thermal management subsystem and a second temperature zone thermal management subsystem; the first circulating pump, heater, first heat exchanger, and liquid-cooling medium channels of the first temperature zone thermal management subsystem are circulated and connected in sequence; the second circulating pump, second radiator, and liquid-cooling medium channels of the second temperature zone thermal management subsystem are circulated and connected in sequence; the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem can selectively operate independently of each other, or can selectively operate in connection with each other. The present invention mainly solves the problem of how to provide an energy storage system with a dual-temperature zone thermal management system; the present invention more effectively meets the thermal management temperature zone requirements of battery packs and power conversion devices, and has the characteristics of high integration, rich functions, good thermal management effect, low energy consumption, and good economy.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management systems, and in particular to a dual-temperature zone liquid cooling thermal management system, an operating method, and an energy storage system using the same. Background Art

[0002] An energy storage system is a system used to store and release electrical energy. It involves the conversion between electrical energy and chemical energy, as well as the conversion between electrical energy and electrical energy. During the above process, a large amount of heat will be generated. If the heat cannot be discharged in time, the temperature of the energy storage system will increase, posing a safety hazard and affecting the performance, lifespan and normal operation of the energy storage system.

[0003] The battery pack is one of the core elements of the energy storage system. It must be in the appropriate temperature zone to achieve its maximum energy efficiency. Therefore, the energy storage system usually needs to be equipped with a thermal management system to control the temperature of the battery pack.

[0004] The power conversion device in the energy storage system (such as the converter, Power Conversion System, referred to as PCS) includes components such as the controller, power electronic devices, and necessary peripheral circuits. It has a large amount of heat generation and is also one of the thermal management targets in the energy storage system.

[0005] Liquid cooling is one of the most widely used thermal management system solutions. However, the thermal management temperature ranges required for battery packs and power conversion devices are often different. If a liquid cooling system is used to simultaneously manage the thermal management of battery packs and power conversion devices, the fluidity of the liquid cooling medium will make the thermal management temperature ranges of the battery pack and the power conversion device roughly the same, making it difficult to accurately manage the thermal management of the battery pack and the power conversion device separately. If different liquid cooling systems are used to manage the thermal management of battery packs and power conversion devices separately, it will obviously increase additional equipment costs, R&D costs, and maintenance costs.

[0006] In summary, how to provide a thermal management system with dual temperature zones for energy storage systems has become one of the urgent issues to be solved. Summary of the Invention

[0007] The purpose of the present invention is to provide a dual-temperature zone liquid-cooled thermal management system, an operating method, and an energy storage system using the same, which can accurately manage the thermal management of battery packs and power conversion devices respectively, and more effectively meet the thermal management temperature zone requirements of battery packs and power conversion devices.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a dual-temperature-zone liquid-cooled thermal management system, applied to an energy storage system, the energy storage system including at least a battery pack and a power conversion device; the dual-temperature-zone thermal management system includes a first temperature-zone thermal management subsystem and a second temperature-zone thermal management subsystem; the first temperature-zone thermal management subsystem includes a first circulation pump, a heater, a first heat exchanger, and a first radiator with a first fan, the first heat exchanger being capable of heat exchange with the battery pack of the energy storage system, and the liquid-cooling medium channels of the first circulation pump, the heater, the first heat exchanger, and the first radiator being circulated and connected in sequence; the second temperature-zone thermal management subsystem includes a second circulation pump, a second heat exchanger, and a second radiator with a second fan, the second heat exchanger being capable of heat exchange with the power conversion device of the energy storage system, and the liquid-cooling medium channels of the second circulation pump, the second radiator, and the second heat exchanger being circulated and connected in sequence; the first temperature-zone thermal management subsystem and the second temperature-zone thermal management subsystem can selectively operate independently of each other, or can selectively operate in interconnected communication.

[0009] In the above technical solution, the dual-temperature zone liquid-cooled thermal management system of the present invention also includes a first three-way valve and a second three-way valve; the liquid cooling medium in the first temperature zone thermal management subsystem can be selectively circulated in the first temperature zone thermal management subsystem under the control of the first three-way valve, or selectively distributed in proportion between the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem; the liquid cooling medium in the second temperature zone thermal management subsystem can be selectively circulated in the second temperature zone thermal management subsystem under the control of the second three-way valve, or selectively distributed in proportion between the second temperature zone thermal management subsystem and the first temperature zone thermal management subsystem.

[0010] In the above technical solution, the first three-way valve and the second three-way valve both include port a, port b and port c, which are controlled by the upper computer and opened / closed proportionally; port a and port c of the first three-way valve are connected to any node of the first temperature zone thermal management subsystem, and port b of the first three-way valve is connected to any node of the second temperature zone thermal management subsystem; port a and port c of the second three-way valve are connected to any node of the second temperature zone thermal management subsystem, and port b of the second three-way valve is connected to any node of the first temperature zone thermal management subsystem.

[0011] In the above technical solution, the first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are integrated in the same heat dissipation device in the form of independent heat dissipation channels; or, the first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are independent heat dissipation devices.

[0012] In the above technical solution, the water inlet side and the water outlet side of the first circulation pump of the first temperature zone thermal management subsystem are respectively provided with a first water inlet sensor group and a first water outlet sensor group; the water inlet side and the water outlet side of the second circulation pump of the second temperature zone thermal management subsystem are respectively provided with a second water inlet sensor group and a second water outlet sensor group.

[0013] In the above technical solution, the first temperature zone thermal management subsystem also includes a first filter for filtering the liquid cooling medium, and the first filter is connected to any node of the first temperature zone thermal management subsystem; the second temperature zone thermal management subsystem also includes a second filter for filtering the liquid cooling medium, and the second filter is connected to any node of the second temperature zone thermal management subsystem.

[0014] In the above technical solution, the first temperature zone thermal management subsystem further includes an expansion tank for balancing the pressure of the liquid cooling medium, and the expansion tank is connected to any node of the first temperature zone thermal management subsystem.

[0015] A method for operating a dual-temperature zone liquid cooling thermal management system, which is applied to the aforementioned dual-temperature zone liquid cooling thermal management system; the method comprises:

[0016] Selectively enter one of the following operating modes based on at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system:

[0017] Dual-temperature-zone heat dissipation mode: starting the first circulation pump of the first temperature-zone thermal management subsystem and starting the second circulation pump of the second temperature-zone thermal management subsystem. The first temperature-zone thermal management subsystem and the second temperature-zone thermal management subsystem operate independently of each other, so that the liquid cooling medium in the first temperature-zone thermal management subsystem and the liquid cooling medium in the second temperature-zone thermal management subsystem do not circulate with each other. Based on at least one operating condition of the energy storage system and / or the dual-temperature-zone liquid-cooling thermal management system, the speeds of the first circulation pump and the first fan of the first temperature-zone thermal management subsystem are controlled, and the speeds of the second circulation pump and the second fan of the second temperature-zone thermal management subsystem are controlled.

[0018] Insulation and waste heat auxiliary heating mode: the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem are started, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are connected and operated so that the liquid cooling medium starts from the first circulation pump of the first temperature zone thermal management subsystem, passes through the heater and the first heat exchanger in sequence, and is then all distributed to enter the second temperature zone thermal management subsystem, and then passes through the second heat exchanger and the second circulation pump of the second temperature zone thermal management subsystem in sequence, and is then all distributed back to the first circulation pump of the first temperature zone thermal management subsystem. The first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are bypassed. According to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system, the speed of the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem is controlled, and the start, stop and heating power of the heater of the first temperature zone thermal management subsystem are controlled;

[0019] Natural heat dissipation and proportional heat dissipation mode: start the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are interconnected and run, so that the liquid cooling medium starts from the first circulation pump of the first temperature zone thermal management subsystem, passes through the heater and the first heat exchanger in sequence, and is proportionally distributed to the first radiator and the second temperature zone thermal management subsystem. The liquid cooling medium distributed to the second temperature zone thermal management subsystem is merged with the liquid cooling medium of the second temperature zone thermal management subsystem itself, and then passes through the second heat exchanger and the second circulation pump in sequence, and is proportionally distributed to the second radiator. and the first temperature-zone thermal management subsystem, wherein the liquid-cooling medium allocated to the first temperature-zone thermal management subsystem merges with the liquid-cooling medium of the first temperature-zone thermal management subsystem itself and then flows back to the first circulation pump of the first temperature-zone thermal management subsystem; and according to at least one operating condition of the energy storage system and / or the dual-temperature-zone liquid-cooling thermal management system, the speed of the first circulation pump of the first temperature-zone thermal management subsystem and / or the second circulation pump of the second temperature-zone thermal management subsystem is controlled, the distribution ratio of the liquid-cooling medium to the first radiator and the second radiator is controlled, and the start, stop, and speed of the first fan of the first temperature-zone thermal management subsystem and the second fan of the second temperature-zone thermal management subsystem are controlled;

[0020] Standby mode: both the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are stopped.

[0021] In the above technical solution, in the dual-temperature zone heat dissipation mode: ports a and c of the first three-way valve are open, port b of the first three-way valve is closed, ports a and c of the second three-way valve are open, and port b of the second three-way valve is closed;

[0022] In the insulation and waste heat auxiliary heating modes: the a and b ports of the first three-way valve are open, the c port of the first three-way valve is closed, the a and b ports of the second three-way valve are open, and the c port of the second three-way valve is closed;

[0023] In the natural heat dissipation and proportional heat dissipation modes: port a, port b, and port c of the first three-way valve are all open, and the opening ratio of port b and port c of the first three-way valve is controlled according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system; port a, port b, and port c of the second three-way valve are all open, and the opening ratio of port b and port c of the second three-way valve is controlled according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system.

[0024] An energy storage system includes the above-mentioned dual-temperature zone liquid cooling thermal management system.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the dual-temperature zone liquid cooling thermal management system, the operating method and the energy storage system using the same, the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem of the present invention can selectively operate independently of each other, and can also selectively operate in interconnected communication, so as to select a dual-temperature zone heat dissipation mode, a heat preservation and waste heat auxiliary heating mode, a natural heat dissipation and proportional heat dissipation mode and a standby mode according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system; in the dual-temperature zone heat dissipation mode, the heat dissipation processes of the battery pack and the power conversion device do not interfere with each other, and the battery pack and the power conversion device can be accurately thermally managed respectively, so as to more effectively meet the thermal management temperature zone requirements of the battery pack and the power conversion device; in the heat preservation and waste heat auxiliary heating mode In addition, the waste heat of the power conversion device can be effectively utilized, the power consumption of the heater can be saved, and the temperature of each battery cell of the battery pack can be made uniform, thereby further improving the energy efficiency of the energy storage system. In the natural heat dissipation and proportional heat dissipation modes, the overall heat dissipation capacity of the dual-temperature zone liquid cooling thermal management system can be improved by the second radiator, thereby improving the heat dissipation capacity of the first temperature zone thermal management subsystem, and quickly dissipating the heat for the battery pack. The overall heat dissipation capacity of the dual-temperature zone liquid cooling thermal management system can be improved by the first radiator, thereby improving the heat dissipation capacity of the second temperature zone thermal management subsystem, and quickly dissipating the heat for the power conversion device. The dual-temperature zone liquid cooling thermal management system, the operation method and the energy storage system using the same of the present invention have the characteristics of high integration, rich functions, good thermal management effect, low energy consumption and good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a system structure diagram of the present invention.

[0027] Figure 2 Schematic diagram of the flow direction of the liquid cooling medium in the dual-temperature zone heat dissipation mode of the present invention.

[0028] Figure 3 Schematic diagram of the flow direction of the liquid cooling medium in the insulation and waste heat auxiliary heating modes of the present invention.

[0029] Figure 4 Schematic diagram of the flow direction of the liquid cooling medium in the natural heat dissipation and proportional heat dissipation modes of the present invention.

[0030] The figures are marked as follows: 1. First temperature zone thermal management subsystem; 11. First circulation pump; 12. Heater; 13. First water inlet sensor group; 14. First heat exchanger; 15. First water outlet sensor group; 16. First radiator; 161. First fan; 17. Expansion tank; 18. First filter; 2. Second temperature zone thermal management subsystem; 21. Second circulation pump; 22. Second radiator; 221. Second fan; 23. Second water inlet sensor group; 24. Second heat exchanger; 25. Second water outlet sensor group; 26. Second filter; 3. First three-way valve; 4. Second three-way valve; 100. Battery pack; 200. Power conversion device. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] This embodiment provides a dual-temperature zone liquid cooling thermal management system, which is applied in an energy storage system to perform thermal management on the energy storage system.

[0033] The energy storage system includes at least a battery pack 100 and a power conversion device 200. In this embodiment, a power conversion system (PCS) commonly used in energy storage systems is used as a typical case of the power conversion device 200 to specifically illustrate the technical solution of the present invention.

[0034] See also Figure 1 The dual-temperature zone liquid cooling thermal management system of this embodiment includes a first temperature zone thermal management subsystem and a second temperature zone thermal management subsystem.

[0035] The first temperature zone thermal management subsystem includes a first circulation pump 11, a heater 12, a first heat exchanger 14 and a first radiator 16 with a first fan 161; wherein the first circulation pump 11 is a liquid pump capable of driving the flow of liquid cooling medium, and its speed is controllable, such as an electronic water pump; the heater 12 is an electric liquid heater for preventing the temperature of the liquid cooling medium from being too low, and its heating power is controllable; the first heat exchanger 14 can exchange heat with the battery pack 100 of the energy storage system. In this embodiment, the first heat exchanger 14 is a metal plate with good thermal conductivity and an internal flow channel. It is attached / built into the battery pack 100 of the energy storage system; the first radiator 16 is a metal radiator with multiple liquid flow channels, and heat dissipation fins are provided between each liquid flow channel. It can dissipate heat for the liquid-cooling medium flowing through it by forced convection or natural convection. The first fan 161 attached to the first radiator 16 is a precision electronic fan with controllable speed, which is used to drive the air to force convection with the first radiator 16; the first circulation pump 11, the heater 12, the first heat exchanger 14 and the liquid-cooling medium channel of the first radiator 16 are circulated and connected in sequence.

[0036] The second temperature zone thermal management subsystem includes a second circulation pump 21, a second heat exchanger 24 and a second radiator 22 with a second fan 221; wherein the second circulation pump 21 is a liquid pump capable of driving the flow of liquid cooling medium, and its speed is controllable, such as an electronic water pump; the second heat exchanger 24 can exchange heat with the power conversion device 200 of the energy storage system. In some possible embodiments, the second heat exchanger 24 is a metal plate with good thermal conductivity and an internal flow channel, which is attached / built-in to the power conversion device 200 of the energy storage system. In other possible embodiments, the second heat exchanger 24 is a metal plate integrated into the power conversion device 200 of the energy storage system. The liquid-cooled heat dissipation flow path formed can be connected to the second heat exchanger 24 through the liquid-cooling medium interface integrated in the power conversion device 200 itself; the second radiator 22 is a metal radiator with multiple liquid flow paths, and heat dissipation fins are arranged between each liquid flow path. It can dissipate heat for the liquid-cooling medium flowing through it by forced convection or natural convection. The second fan 221 attached to the second radiator 22 is a precision electronic fan with controllable speed, which is used to drive the air to perform forced convection with the second radiator 22; the liquid-cooling medium channels of the second circulation pump 21, the second radiator 22 and the second heat exchanger 24 are circulated and connected in sequence.

[0037] It should be noted that, in some possible embodiments, the first radiator 16 of the first temperature zone thermal management subsystem and the second radiator 22 of the second temperature zone thermal management subsystem are integrated in the same heat dissipation device in the form of independent heat dissipation channels to fully utilize the heat dissipation device, reduce the footprint / volume of the dual-temperature zone liquid cooling thermal management system and the energy storage system, and save the cost of the heat dissipation device; or, in other possible embodiments, the first radiator 16 of the first temperature zone thermal management subsystem and the second radiator 22 of the second temperature zone thermal management subsystem are independent heat dissipation devices to obtain better heat dissipation effect.

[0038] The first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem can selectively operate independently of each other, and can also selectively operate in interconnected communication.

[0039] Specifically, the dual-temperature zone liquid-cooled thermal management system of this embodiment also includes a first three-way valve 3 and a second three-way valve 4; the liquid cooling medium in the first temperature zone thermal management subsystem can be selectively circulated in the first temperature zone thermal management subsystem under the control of the first three-way valve 3, or selectively distributed in proportion between the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem; the liquid cooling medium in the second temperature zone thermal management subsystem can be selectively circulated in the second temperature zone thermal management subsystem under the control of the second three-way valve 4, or selectively distributed in proportion between the second temperature zone thermal management subsystem and the first temperature zone thermal management subsystem.

[0040] More specifically, the first three-way valve 3 and the second three-way valve 4 are both electrically controlled valves, such as electric three-way valves or magnetically controlled three-way valves; the first three-way valve 3 and the second three-way valve 4 both include a port, b port and c port that are controlled by a control device and opened / closed proportionally; the a port and c port of the first three-way valve 3 are connected to any node of the first temperature zone thermal management subsystem. In this embodiment, the a port of the first three-way valve 3 is connected to the water outlet side of the first heat exchanger 14, and the c port of the first three-way valve 3 is connected to the water inlet side of the first radiator 16; the b port of the first three-way valve 3 is connected to any node of the second temperature zone thermal management subsystem In this embodiment, the b port of the first three-way valve 3 is connected to the second radiator 22 and the second heat exchanger 24 of the second temperature zone thermal management subsystem; the a port and the c port of the second three-way valve 4 are connected to any node of the second temperature zone thermal management subsystem. In this embodiment, the a port of the second three-way valve 4 is connected to the water outlet side of the second circulation pump 21, and the c port of the second three-way valve 4 is connected to the water inlet side of the second radiator 22; the b port of the second three-way valve 4 is connected to any node of the first temperature zone thermal management subsystem. In this embodiment, the b port of the second three-way valve 4 is connected to the water outlet side of the first radiator 16 of the first temperature zone thermal management subsystem.

[0041] Furthermore, the water inlet side and the water outlet side of the first circulation pump 11 of the first temperature zone thermal management subsystem are respectively provided with a first water inlet sensor group 13 and a first water outlet sensor group 15, and the first water inlet sensor group 13 and the first water outlet sensor group 15 respectively include a temperature sensor and a pressure sensor, so as to respectively transmit the water inlet side temperature, water inlet side pressure, water outlet side temperature and water outlet side pressure of the first circulation pump 11 to the control device; the water inlet side and the water outlet side of the second circulation pump 21 of the second temperature zone thermal management subsystem are respectively provided with a second water inlet sensor group 23 and a second water outlet sensor group 25, and the second water inlet sensor group 23 and the second water outlet sensor group 25 respectively include a temperature sensor and a pressure sensor, so as to respectively transmit the water inlet side temperature, water inlet side pressure, water outlet side temperature and water outlet side pressure of the second circulation pump 21 to the control device.

[0042] Furthermore, the first temperature zone thermal management subsystem also includes a first filter 18 for filtering the liquid cooling medium. The first filter 18 is a liquid cooling medium-specific filter commonly used in the prior art. It can filter out impurities such as particles, flocs and colloids in the liquid cooling medium, so that the liquid cooling medium can maintain good thermal conductivity and fluidity. The first filter 18 is connected to any node of the first temperature zone thermal management subsystem. In this embodiment, the first filter 18 is connected to the water inlet side of the first circulation pump 11; the second temperature zone thermal management subsystem also includes a second filter 26 for filtering the liquid cooling medium. The second filter 26 is a liquid cooling medium-specific filter commonly used in the prior art. It can filter out impurities such as particles, flocs and colloids in the liquid cooling medium, so that the liquid cooling medium can maintain good thermal conductivity and fluidity. The second filter 26 is connected to any node of the second temperature zone thermal management subsystem. In this embodiment, the second filter 26 is connected to the water inlet side of the second circulation pump 21.

[0043] In the thermal management system, the pressure of the liquid cooling medium in the thermal management system may change due to factors such as temperature changes, small leakage or evaporation of the liquid cooling medium, too little / too much filling of the liquid cooling medium, and fluctuations in the operation of the circulation pump, which may affect the normal operation of the thermal management system and even cause the pipeline to break or fall off. To solve the above problems, the first temperature zone thermal management subsystem also includes an expansion tank 17 for balancing the pressure of the liquid cooling medium. The expansion tank 17 is connected to any node of the first temperature zone thermal management subsystem. In this embodiment, the expansion tank 17 is connected to the water outlet side of the first radiator 16. The expansion tank 17 is provided to provide additional pressure / reduce pressure to the first temperature zone thermal management subsystem, thereby ensuring that the liquid cooling medium pressure of the entire dual-temperature zone liquid cooling thermal management system is maintained in an appropriate range.

[0044] It can be understood that the dual-temperature zone liquid cooling thermal management system of this embodiment is configured with a control device (such as a programmable controller, an embedded system and an industrial control computer); the first circulation pump 11 of the first temperature zone thermal management subsystem and the second circulation pump 21 of the second temperature zone thermal management subsystem are both connected to the control device through a universal input / output interface or a communication interface to realize signal connection with the control device, so as to respectively control the start, stop and speed of the first circulation pump 11 and the second circulation pump 21; the first fan 161 of the first temperature zone thermal management subsystem and the second fan 221 of the second temperature zone thermal management subsystem are both connected to the control device through a universal input / output interface or a communication interface to respectively control the start, stop and speed of the first fan 161 and the second fan 221; the heater 12 of the first temperature zone thermal management subsystem is connected to the control device through a universal input / output interface or a communication interface. The first three-way valve 3 and the second three-way valve 4 are connected to the control device through a universal input / output interface or a communication interface to realize signal connection with the control device, so that the first three-way valve 3 and the second three-way valve 4 can be controlled by the control device, thereby realizing proportional opening / closing of port a, port b and port c; the first water inlet sensor group 13 and the first water outlet sensor group 15 of the first temperature zone thermal management subsystem, and the second water inlet sensor group 23 and the second water outlet sensor group 25 of the second temperature zone thermal management subsystem are all connected to the control device through a universal input / output interface, an analog interface or a communication interface to realize signal connection with the control device to respectively realize the transmission of the water inlet side temperature, water inlet side pressure, water outlet side temperature and water outlet side pressure of the first circulation pump 11 and the water inlet side temperature, water inlet side pressure, water outlet side temperature and water outlet side pressure of the second circulation pump 21.

[0045] This embodiment further provides an operating method of a dual-temperature zone liquid cooling thermal management system, which is applied to the aforementioned dual-temperature zone liquid cooling thermal management system; the method comprises:

[0046] Based on at least one operating condition of the energy storage system and / or the dual-zone liquid cooling thermal management system, one of the following operating modes is selectively entered:

[0047] Dual-temperature zone heat dissipation mode: start the first circulation pump 11 of the first temperature zone thermal management subsystem, and start the second circulation pump 21 of the second temperature zone thermal management subsystem. The first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem operate independently of each other, so that the liquid cooling medium in the first temperature zone thermal management subsystem and the liquid cooling medium in the second temperature zone thermal management subsystem do not circulate with each other. According to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system, the speed of the first circulation pump 11 and the first fan 161 of the first temperature zone thermal management subsystem is controlled, and the speed of the second circulation pump 21 and the second fan 221 of the second temperature zone thermal management subsystem is controlled.

[0048] Specifically, in the dual-temperature zone heat dissipation mode: port a and port c of the first three-way valve 3 are open, port b of the first three-way valve 3 is closed, port a and port c of the second three-way valve 4 are open, and port b of the second three-way valve 4 is closed.

[0049] The dual-temperature zone heat dissipation mode is suitable for when the ambient temperature is high. The heat of the battery pack 100 is absorbed by the liquid cooling medium and dissipated at the first radiator 16. The heat of the power conversion device 200 is absorbed by the liquid cooling medium and dissipated at the second radiator 22, so that both the battery pack 100 and the power conversion device 200 can obtain good heat dissipation effects. In addition, the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem operate independently of each other, so that the liquid cooling medium in the first temperature zone thermal management subsystem and the liquid cooling medium in the second temperature zone thermal management subsystem do not flow with each other, and the heat dissipation processes of the battery pack 100 and the power conversion device 200 do not interfere with each other. The battery pack 100 and the power conversion device 200 can be accurately thermally managed respectively (that is, the thermal management temperature zones of the battery pack 100 and the power conversion device 200 can be the same or different), more effectively meeting the thermal management temperature zone requirements of the battery pack 100 and the power conversion device 200.

[0050] Based on at least one operating condition of the energy storage system and / or the dual-temperature-zone liquid-cooling thermal management system, for example, the temperature of the battery pack 100 and the temperature of the power conversion device 200 directly fed back to the control device by the management system (BMS / EMS / TMS) of the energy storage system, or the water inlet temperature, water inlet pressure, water outlet temperature, and water outlet pressure of the first circulation pump 11 transmitted by the first water inlet sensor group 13 and the first water outlet sensor group 15, and the water inlet temperature, water inlet pressure, water outlet temperature, and water outlet pressure of the second circulation pump 21 transmitted by the second water inlet sensor group 23 and the second water outlet sensor group 25, the speeds of the first circulation pump 11 and the first fan 161 of the first temperature-zone thermal management subsystem and the speeds of the second circulation pump 21 and the second fan 221 of the second temperature-zone thermal management subsystem are controlled, thereby achieving closed-loop control of the dual-temperature-zone liquid-cooling thermal management system, thereby accurately thermally managing the battery pack 100 and the power conversion device 200, respectively.

[0051] In the heat preservation and waste heat auxiliary heating mode, the first circulation pump 11 of the first temperature zone thermal management subsystem and / or the second circulation pump 21 of the second temperature zone thermal management subsystem are started, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are interconnected and operated, so that the liquid cooling medium starts from the first circulation pump 11 of the first temperature zone thermal management subsystem, passes through the heater 12 and the first heat exchanger 14 in sequence, and is then distributed to the second temperature zone thermal management subsystem. Then, after passing through the second heat exchanger 24 and the second circulation pump 21 of the second temperature zone thermal management subsystem in sequence, it is completely distributed back to the first circulation pump 11 of the first temperature zone thermal management subsystem. The first radiator 16 of the first temperature zone thermal management subsystem and the second radiator 22 of the second temperature zone thermal management subsystem are bypassed. According to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system, the speed of the first circulation pump 11 of the first temperature zone thermal management subsystem and / or the second circulation pump 21 of the second temperature zone thermal management subsystem is controlled, and the start, stop and heating power of the heater 12 of the first temperature zone thermal management subsystem are controlled.

[0052] Specifically, in the insulation and waste heat auxiliary heating modes: port a and port b of the first three-way valve 3 are open, port c of the first three-way valve 3 is closed, port a and port b of the second three-way valve 4 are open, and port c of the second three-way valve 4 is closed.

[0053] The heat preservation and waste heat auxiliary heating mode is suitable for when the ambient temperature is low. It absorbs the heat of the power conversion device 200 through the liquid cooling medium and releases the heat at the battery pack 100. It can also selectively heat the liquid cooling medium through the heater 12 of the first temperature zone thermal management subsystem, so that the battery pack 100 can always operate in the optimal energy efficiency temperature zone; in addition, the heat preservation and waste heat auxiliary heating mode effectively utilizes the waste heat of the power conversion device 200, which can save the power consumption of the heater 12; furthermore, the heat preservation and waste heat auxiliary heating mode can make the temperature of each battery cell of the battery pack 100 uniform, further improving the energy efficiency of the energy storage system.

[0054] Based on at least one operating condition of the energy storage system and / or the dual-temperature-zone liquid-cooling thermal management system, for example, the temperature of the battery pack 100 and the temperature of the power conversion device 200 directly fed back to the control device by the management system (BMS / EMS / TMS) of the energy storage system, or the water inlet temperature, water inlet pressure, water outlet temperature, and water outlet pressure of the first circulation pump 11 transmitted by the first water inlet sensor group 13 and the first water outlet sensor group 15, and the water inlet temperature, water inlet pressure, water outlet temperature, and water outlet pressure of the second circulation pump 21 transmitted by the second water inlet sensor group 23 and the second water outlet sensor group 25, the speed of the first circulation pump 11 of the first temperature-zone thermal management subsystem and / or the second circulation pump 21 of the second temperature-zone thermal management subsystem is controlled, and the start, stop, and heating power of the heater 12 of the first temperature-zone thermal management subsystem are controlled. This enables closed-loop control of the dual-temperature-zone liquid-cooling thermal management system, thereby accurately thermally managing the battery pack 100 and the power conversion device 200, respectively.

[0055] Natural heat dissipation and proportional heat dissipation mode: start the first circulation pump 11 of the first temperature zone thermal management subsystem and / or the second circulation pump 21 of the second temperature zone thermal management subsystem, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are interconnected and run, so that the liquid cooling medium starts from the first circulation pump 11 of the first temperature zone thermal management subsystem, passes through the heater 12 and the first heat exchanger 14 in sequence, and is proportionally distributed to the first radiator 16 and the second temperature zone thermal management subsystem. After the liquid cooling medium distributed to the second temperature zone thermal management subsystem merges with the liquid cooling medium of the second temperature zone thermal management subsystem itself, it passes through the second heat exchanger 24 and the second circulation pump 21 in sequence, and is proportionally distributed to the second radiator 22 and The first temperature zone thermal management subsystem, after the liquid cooling medium allocated to the first temperature zone thermal management subsystem merges with the liquid cooling medium of the first temperature zone thermal management subsystem itself, flows back to the first circulation pump 11 of the first temperature zone thermal management subsystem, and controls the speed of the first circulation pump 11 of the first temperature zone thermal management subsystem and / or the second circulation pump 21 of the second temperature zone thermal management subsystem according to at least one operating condition of the energy storage system and / or the dual temperature zone liquid cooling thermal management system, controls the distribution ratio of the liquid cooling medium to the first radiator 16 and the second radiator 22, and controls the start, stop and speed of the first fan 161 of the first temperature zone thermal management subsystem and the second fan 221 of the second temperature zone thermal management subsystem.

[0056] Specifically, in the natural heat dissipation and proportional heat dissipation modes: port a, port b and port c of the first three-way valve 3 are all open, and the opening ratio of port b and port c of the first three-way valve 3 is controlled according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system; port a, port b and port c of the second three-way valve 4 are all open, and the opening ratio of port b and port c of the second three-way valve 4 is controlled according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system.

[0057] The natural heat dissipation and proportional heat dissipation modes are suitable for when the ambient temperature is moderate, the battery pack 100 generates low heat, and the power conversion device 200 generates low heat or does not generate heat. The advantages are: when the power conversion device 200 is not running, it does not generate heat, so there is no need for heat dissipation. At this time, the second radiator 22 can also be used to improve the overall heat dissipation capacity of the dual-temperature zone liquid cooling thermal management system, thereby improving the heat dissipation capacity of the first temperature zone thermal management subsystem, and quickly dissipating heat for the battery pack 100; when the heat dissipation capacity of the second radiator 22 is insufficient, the first radiator 16 can be used to improve the overall heat dissipation capacity of the dual-temperature zone liquid cooling thermal management system, thereby improving the heat dissipation capacity of the second temperature zone thermal management subsystem, and quickly dissipating heat for the power conversion device 200.

[0058] For example, when the ambient temperature is low (for example, below 20°C) and the power conversion device 200 is not running, only the first circulation pump 11 of the first temperature zone thermal management subsystem can be started, while the first fan 161 of the first temperature zone thermal management subsystem and the first circulation pump 11 and the second fan 221 of the second temperature zone thermal management subsystem can be stopped. The heat dissipation of the battery pack 100 can be met only by natural convection through the first radiator 16 and the second radiator 22, so that the energy consumption of the dual-temperature zone liquid cooling thermal management system is at a low level, effectively improving the energy saving level of the energy storage system.

[0059] According to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system, for example, the temperature of the battery pack 100, the temperature of each cell of the battery pack 100, the temperature of the power conversion device 200 directly fed back to the control device by the management system (BMS / EMS / TMS) of the energy storage system, or the water inlet side temperature, water inlet side pressure, water outlet side temperature and water outlet side pressure of the first circulation pump 11 transmitted by the first water inlet sensor group 13 and the first water outlet sensor group 15, and the water inlet side temperature, water inlet side pressure, water outlet side temperature and water outlet side pressure of the second circulation pump 21 transmitted by the second water inlet sensor group 23 and the second water outlet sensor group 25, in addition, the temperature of the battery pack 100 and the power conversion device 200 can also be calculated. The speed of the first circulation pump 11 of the first temperature zone thermal management subsystem and / or the second circulation pump 21 of the second temperature zone thermal management subsystem is controlled according to the temperature difference, and the distribution ratio of the liquid cooling medium to the first radiator 16 and the second radiator 22 is controlled (when the temperature of the battery pack 100 is higher, more liquid cooling medium is distributed to the first radiator 16, and when the temperature of the power conversion device 200 is higher, more liquid cooling medium is distributed to the second radiator 22). The start, stop and speed of the first fan 161 of the first temperature zone thermal management subsystem and the second fan 221 of the second temperature zone thermal management subsystem are also controlled, which can realize closed-loop control of the dual-temperature zone liquid cooling thermal management system, and then accurately manage the battery pack 100 and the power conversion device 200 respectively.

[0060] Standby mode: Both the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are stopped.

[0061] In standby mode, the dual-temperature zone liquid cooling thermal management system of this embodiment consumes no energy or consumes very low energy.

[0062] This embodiment also provides an energy storage system, which includes the above-mentioned dual-temperature zone liquid cooling thermal management system.

[0063] The dual-temperature zone liquid cooling thermal management system, operation method and energy storage system using the same of this embodiment, the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem can selectively operate independently of each other, and can also selectively operate in interconnected communication, so as to select a dual-temperature zone heat dissipation mode, a heat preservation and waste heat auxiliary heating mode, a natural heat dissipation and proportional heat dissipation mode and a standby mode according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system; in the dual-temperature zone heat dissipation mode, the heat dissipation processes of the battery pack 100 and the power conversion device 200 do not interfere with each other, and the battery pack 100 and the power conversion device 200 can be accurately thermally managed respectively, so as to more effectively meet the thermal management temperature zone requirements of the battery pack 100 and the power conversion device 200; in the heat preservation and waste heat auxiliary heating mode, it can effectively utilize The waste heat of the power conversion device 200 saves the power consumption of the heater 12 and can also make the temperature of each battery cell of the battery pack 100 uniform, further improving the energy efficiency of the energy storage system. In the natural heat dissipation and proportional heat dissipation modes, the second radiator 22 can be used to improve the overall heat dissipation capacity of the dual-temperature zone liquid cooling thermal management system, thereby improving the heat dissipation capacity of the first temperature zone thermal management subsystem, and quickly dissipating heat for the battery pack 100. The first radiator 16 can also be used to improve the overall heat dissipation capacity of the dual-temperature zone liquid cooling thermal management system, thereby improving the heat dissipation capacity of the second temperature zone thermal management subsystem, and quickly dissipating heat for the power conversion device 200. The dual-temperature zone liquid cooling thermal management system, operation method and energy storage system using the same of this embodiment have the characteristics of high integration, rich functions, good thermal management effect, low energy consumption and good economy.

[0064] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A dual-temperature zone liquid cooling thermal management system, applied in an energy storage system, wherein the energy storage system comprises at least a battery pack and a power conversion device; characterized in that: It includes a first temperature zone thermal management subsystem and a second temperature zone thermal management subsystem; The first temperature zone thermal management subsystem includes a first circulation pump, a heater, a first heat exchanger, and a first radiator with a first fan. The first heat exchanger is capable of exchanging heat with the battery pack of the energy storage system. The liquid cooling medium channels of the first circulation pump, the heater, the first heat exchanger, and the first radiator are circulated and connected in sequence. The second temperature zone thermal management subsystem includes a second circulation pump, a second heat exchanger, and a second radiator with a second fan. The second heat exchanger is capable of exchanging heat with the power conversion device of the energy storage system. The second circulation pump, the second radiator, and the liquid cooling medium channel of the second heat exchanger are cyclically connected in sequence. The first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem can selectively operate independently of each other, or can selectively operate in communication with each other; Also included are a first three-way valve and a second three-way valve; The liquid cooling medium in the first temperature zone thermal management subsystem can be selectively circulated in the first temperature zone thermal management subsystem or selectively distributed in proportion between the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem under the control of the first three-way valve; The liquid cooling medium in the second temperature zone thermal management subsystem can be selectively circulated in the second temperature zone thermal management subsystem or selectively distributed in proportion between the second temperature zone thermal management subsystem and the first temperature zone thermal management subsystem under the control of the second three-way valve; The first three-way valve and the second three-way valve each include a port, a port b, and a port c which are controlled by a control device and opened / closed proportionally; Port a and port c of the first three-way valve are connected to any node of the first temperature zone thermal management subsystem, and port b of the first three-way valve is connected to any node of the second temperature zone thermal management subsystem; Port a and port c of the second three-way valve are connected to any node of the second temperature zone thermal management subsystem, and port b of the second three-way valve is connected to any node of the first temperature zone thermal management subsystem; The dual-temperature zone liquid cooling thermal management system selectively enters one of the following operating modes according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system: Insulation and waste heat auxiliary heating mode: the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem are started, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are connected and operated, so that the liquid cooling medium starts from the first circulation pump of the first temperature zone thermal management subsystem and is completely distributed to enter the second temperature zone thermal management subsystem, and then after passing through the second temperature zone thermal management subsystem, is completely distributed and flows back to the first circulation pump of the first temperature zone thermal management subsystem, and the first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are bypassed; Natural heat dissipation and proportional heat dissipation mode: start the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are interconnected and operated, so that the liquid cooling medium starts from the first circulation pump of the first temperature zone thermal management subsystem and is proportionally distributed to the first radiator and the second temperature zone thermal management subsystem. After the liquid cooling medium allocated to the second temperature zone thermal management subsystem merges with the liquid cooling medium of the second temperature zone thermal management subsystem itself, it is proportionally distributed to the second radiator and the first temperature zone thermal management subsystem. After the liquid cooling medium allocated to the first temperature zone thermal management subsystem merges with the liquid cooling medium of the first temperature zone thermal management subsystem itself, it flows back to the first circulation pump of the first temperature zone thermal management subsystem.

2. A dual-temperature zone liquid cooling thermal management system according to claim 1, characterized in that: The first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are integrated into the same heat dissipation device in the form of independent heat dissipation channels; Alternatively, the first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are independent heat dissipation devices.

3. The dual-temperature zone liquid cooling thermal management system according to claim 1, characterized in that: The water inlet side and the water outlet side of the first circulation pump of the first temperature zone thermal management subsystem are respectively provided with a first water inlet sensor group and a first water outlet sensor group; A second water inlet sensor group and a second water outlet sensor group are respectively provided on the water inlet side and the water outlet side of the second circulation pump of the second temperature zone thermal management subsystem.

4. The dual-temperature zone liquid cooling thermal management system according to claim 1, characterized in that: The first temperature zone thermal management subsystem further includes a first filter for filtering the liquid cooling medium, wherein the first filter is connected to any node of the first temperature zone thermal management subsystem; The second temperature zone thermal management subsystem further includes a second filter for filtering the liquid cooling medium, and the second filter is connected to any node of the second temperature zone thermal management subsystem.

5. The dual-temperature zone liquid cooling thermal management system according to claim 1, characterized in that: The first temperature zone thermal management subsystem further includes an expansion tank for balancing the pressure of the liquid cooling medium, and the expansion tank is connected to any node of the first temperature zone thermal management subsystem.

6. A method for operating a dual-temperature zone liquid cooling thermal management system, characterized in that: It is applied to the dual-temperature zone liquid cooling thermal management system according to any one of claims 1 to 5; the method comprises: Selectively enter one of the following operating modes based on at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system: Dual-temperature-zone heat dissipation mode: starting the first circulation pump of the first temperature-zone thermal management subsystem and starting the second circulation pump of the second temperature-zone thermal management subsystem. The first temperature-zone thermal management subsystem and the second temperature-zone thermal management subsystem operate independently of each other, so that the liquid cooling medium in the first temperature-zone thermal management subsystem and the liquid cooling medium in the second temperature-zone thermal management subsystem do not circulate with each other. Based on at least one operating condition of the energy storage system and / or the dual-temperature-zone liquid-cooling thermal management system, the speeds of the first circulation pump and the first fan of the first temperature-zone thermal management subsystem are controlled, and the speeds of the second circulation pump and the second fan of the second temperature-zone thermal management subsystem are controlled. Insulation and waste heat auxiliary heating mode: the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem are started, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are connected and operated so that the liquid cooling medium starts from the first circulation pump of the first temperature zone thermal management subsystem, passes through the heater and the first heat exchanger in sequence, and is then all distributed to enter the second temperature zone thermal management subsystem, and then passes through the second heat exchanger and the second circulation pump of the second temperature zone thermal management subsystem in sequence, and is then all distributed back to the first circulation pump of the first temperature zone thermal management subsystem. The first radiator of the first temperature zone thermal management subsystem and the second radiator of the second temperature zone thermal management subsystem are bypassed. According to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system, the speed of the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem is controlled, and the start, stop and heating power of the heater of the first temperature zone thermal management subsystem are controlled; Natural heat dissipation and proportional heat dissipation mode: start the first circulation pump of the first temperature zone thermal management subsystem and / or the second circulation pump of the second temperature zone thermal management subsystem, and the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are interconnected and run, so that the liquid cooling medium starts from the first circulation pump of the first temperature zone thermal management subsystem, passes through the heater and the first heat exchanger in sequence, and is proportionally distributed to the first radiator and the second temperature zone thermal management subsystem. The liquid cooling medium distributed to the second temperature zone thermal management subsystem is merged with the liquid cooling medium of the second temperature zone thermal management subsystem itself, and then passes through the second heat exchanger and the second circulation pump in sequence, and is proportionally distributed to the second radiator. and the first temperature-zone thermal management subsystem, wherein the liquid-cooling medium allocated to the first temperature-zone thermal management subsystem merges with the liquid-cooling medium of the first temperature-zone thermal management subsystem itself and then flows back to the first circulation pump of the first temperature-zone thermal management subsystem; and according to at least one operating condition of the energy storage system and / or the dual-temperature-zone liquid-cooling thermal management system, the speed of the first circulation pump of the first temperature-zone thermal management subsystem and / or the second circulation pump of the second temperature-zone thermal management subsystem is controlled, the distribution ratio of the liquid-cooling medium to the first radiator and the second radiator is controlled, and the start, stop, and speed of the first fan of the first temperature-zone thermal management subsystem and the second fan of the second temperature-zone thermal management subsystem are controlled; Standby mode: both the first temperature zone thermal management subsystem and the second temperature zone thermal management subsystem are stopped.

7. The operating method of the dual-temperature zone liquid cooling thermal management system according to claim 6, characterized in that: The dual-temperature zone liquid cooling thermal management system further includes a first three-way valve and a second three-way valve, each of the first three-way valve and the second three-way valve including a port a, a port b, and a port c controlled by a control device and opened / closed proportionally; Port a and port c of the first three-way valve are connected to any node of the first temperature zone thermal management subsystem, and port b of the first three-way valve is connected to any node of the second temperature zone thermal management subsystem; Port a and port c of the second three-way valve are connected to any node of the second temperature zone thermal management subsystem, and port b of the second three-way valve is connected to any node of the first temperature zone thermal management subsystem; In the dual-temperature zone cooling mode: ports a and c of the first three-way valve are open, port b of the first three-way valve is closed, ports a and c of the second three-way valve are open, and port b of the second three-way valve is closed; In the insulation and waste heat auxiliary heating modes: the a and b ports of the first three-way valve are open, the c port of the first three-way valve is closed, the a and b ports of the second three-way valve are open, and the c port of the second three-way valve is closed; In the natural heat dissipation and proportional heat dissipation modes: port a, port b, and port c of the first three-way valve are all open, and the opening ratio of port b and port c of the first three-way valve is controlled according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system; port a, port b, and port c of the second three-way valve are all open, and the opening ratio of port b and port c of the second three-way valve is controlled according to at least one operating condition of the energy storage system and / or the dual-temperature zone liquid cooling thermal management system.

8. An energy storage system, characterized in that: It includes the dual-temperature zone liquid cooling thermal management system described in any one of claims 1-5.

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