Energy storage battery thermal management system with ambient temperature control function and control method

Abstract

The present invention discloses a thermal management system and control method for an energy storage battery with an ambient temperature control function, relating to the technical field of thermal management for energy storage batteries. The system comprises a compressor, a first condenser assembly, a second condenser assembly, a filter drier, a first liquid reservoir, a plate heat exchanger, a second liquid reservoir, a third liquid reservoir, an in-tank heat exchanger assembly, an energy storage battery, and a gas-liquid separator. The present invention can cool or heat the internal temperature of the energy storage battery and the container, thereby better ensuring the continuous and safe operation of the energy storage battery within the appropriate operating temperature range, mitigating the loss of energy storage battery capacity, and improving its service life and thermal stability.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of energy storage batteries, and in particular to an energy storage battery thermal management system with an ambient temperature control function and a control method thereof. Background Art

[0002] Currently, containerized energy storage battery systems are generally installed outdoors, and the optimal operating temperature range for energy storage batteries is between 10°C and 35°C. Thermal management of energy storage batteries is crucial to ensuring the continuous and safe operation of energy storage systems. The mainstream thermal management methods for energy storage batteries are air cooling and liquid cooling. Direct cooling is a newer cooling technology compared to the first two. The refrigerant in the refrigeration system directly exchanges heat with the energy storage batteries, resulting in higher energy efficiency. Lithium batteries are the core components of containerized energy storage systems. Temperature primarily affects their capacity, service life, and thermal stability. Lithium battery capacity and service life vary significantly with temperature, primarily due to temperature-induced changes in internal resistance and voltage. High temperatures increase the internal resistance of the negative electrode, leading to loss of active materials and effective lithium ions. Low temperatures significantly reduce the electrolyte's transport properties, resulting in a significant decrease in capacity. For example, the capacity retention rate of lithium iron phosphate batteries below 0°C is 60-70%, while at -20°C, this rate drops to 20-40%. Summary of the Invention

[0003] To address the problem in the prior art that ambient temperature has a significant impact on the continued operation of energy storage batteries, the present invention provides an energy storage battery thermal management system and control method with ambient temperature control function. This can cool or heat the energy storage batteries and the internal temperature of the container, thereby better ensuring that the energy storage batteries continue to operate safely within the appropriate operating temperature range, slowing down the reduction of the energy storage battery capacity, and improving the service life and thermal stability of the energy storage batteries.

[0004] To achieve the above object, the present invention can be carried out using the following technical solutions:

[0005] In a first aspect, the present invention provides an energy storage battery thermal management system with an ambient temperature control function, comprising:

[0006] Compressor, first condenser assembly, second condenser assembly, drying filter, first liquid reservoir, plate heat exchanger, second liquid reservoir, third liquid reservoir, in-tank heat exchanger assembly, energy storage battery, gas-liquid separator;

[0007] Wherein, the outlet of the compressor is respectively connected to the inlet of the first condenser assembly and the inlet of the second condenser assembly through pipes, the outlet of the first condenser assembly and the outlet of the second condenser assembly are both connected to the inlet of the drying filter through pipes, the outlet of the drying filter is connected to the inlet of the first liquid reservoir through a pipe, the outlet of the first liquid reservoir is connected to the first inlet of the plate heat exchanger through a pipe, the first outlet of the plate heat exchanger is respectively connected to the inlet of the second liquid reservoir and the inlet of the third liquid reservoir through pipes, the outlet of the second liquid reservoir is connected to the inlet of the in-tank heat exchanger assembly through a pipe, the outlet of the third liquid reservoir is connected to the inlet of the energy storage battery through a pipe, the outlet of the energy storage battery and the outlet of the in-tank heat exchanger assembly are both connected to the second inlet of the plate heat exchanger through pipes, the second outlet of the plate heat exchanger is connected to the inlet of the gas-liquid separator through a pipe, and the outlet of the gas-liquid separator is connected to the inlet of the compressor through a pipe.

[0008] As described above, the energy storage battery thermal management system with an ambient temperature control function is further provided with a four-way valve on the pipeline between the compressor and the first condenser assembly and the second condenser assembly. The four-way valve is respectively connected to the outlet of the compressor, the pipeline between the inlet of the first condenser assembly and the inlet of the second condenser assembly, the pipeline between the second inlet and the second outlet of the plate heat exchanger, and the inlet of the gas-liquid separator through pipelines.

[0009] As described above, the energy storage battery thermal management system with an ambient temperature control function is further provided with a first solenoid valve on the pipe between the compressor and the second condenser assembly, a second solenoid valve on the pipe between the energy storage battery and the plate heat exchanger, a third solenoid valve on the pipe between the second inlet of the plate heat exchanger and the four-way valve, and a fourth solenoid valve on the pipe between the second outlet of the plate heat exchanger and the four-way valve.

[0010] As described above, in the energy storage battery thermal management system with an ambient temperature control function, further, a first electronic expansion valve is provided on the pipe between the first outlet of the plate heat exchanger and the inlet of the second liquid reservoir, and a second electronic expansion valve is provided on the pipe between the first outlet of the plate heat exchanger and the inlet of the third liquid reservoir.

[0011] As described above, the energy storage battery thermal management system with an ambient temperature control function is further provided with a first temperature sensor and a first pressure sensor on the pipe connected to the first outlet of the plate heat exchanger, a second temperature sensor and a second pressure sensor on the pipe connected to the outlet of the heat exchanger assembly in the box, a third temperature sensor and a third pressure sensor on the pipe connected to the inlet of the energy storage battery, a fourth temperature sensor and a fourth pressure sensor on the pipe connected to the outlet of the energy storage battery, a fifth temperature sensor and a fifth pressure sensor on the pipe connected to the outlet of the gas-liquid separator, and a sixth temperature sensor for detecting the temperature in the box.

[0012] As in the above-mentioned energy storage battery thermal management system with environmental temperature control function, further, the outlet of the energy storage battery is also connected to the inlet of the heat exchanger assembly in the box through a pipeline.

[0013] As described above, in the energy storage battery thermal management system with the ambient temperature control function, further, a fifth solenoid valve is provided on the pipe connecting the outlet of the energy storage battery and the inlet of the heat exchanger assembly in the box.

[0014] As described above, the energy storage battery thermal management system with the ambient temperature control function, further, the first condenser assembly, the second condenser assembly and the in-box heat exchanger assembly are all provided with a heat exchanger and a fan.

[0015] In a second aspect, the present invention provides a method for controlling thermal management of an energy storage battery with an ambient temperature control function, which is used in the aforementioned thermal management system for an energy storage battery with an ambient temperature control function to achieve cooling or heating of the internal temperature of the energy storage battery and / or container, comprising:

[0016] In the energy storage battery cooling mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, the first condenser assembly, the drying filter, the first liquid reservoir, the plate heat exchanger, the second electronic expansion valve, the third liquid reservoir, the energy storage battery, the second solenoid valve, the plate heat exchanger, the fourth solenoid valve, the four-way valve, the gas-liquid separator, and then returns to the compressor;

[0017] In the container internal temperature cooling mode, the refrigerant flow path is as follows: from the compressor, through the four-way valve, the first condenser assembly, the dry filter, the first liquid reservoir, the plate heat exchanger, the first electronic expansion valve, the second liquid reservoir, the internal heat exchanger assembly, the plate heat exchanger, the fourth solenoid valve, the four-way valve, the gas-liquid separator, and then back to the compressor;

[0018] In the energy storage battery and container internal temperature cooling mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, and then flows through the first condenser assembly, the first solenoid valve, and the second condenser assembly. Then, it passes through the dry filter, the first liquid reservoir, and the plate heat exchanger. Then, it flows through the first electronic expansion valve, the second liquid reservoir, the in-tank heat exchanger assembly, the second electronic expansion valve, the third liquid reservoir, the energy storage battery, the second solenoid valve, and then through the plate heat exchanger, the fourth solenoid valve, the four-way valve, and the gas-liquid separator before returning to the compressor.

[0019] In the energy storage battery heating mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, the fourth solenoid valve, the plate heat exchanger, the second solenoid valve, the energy storage battery, the third liquid reservoir, the second electronic expansion valve, the plate heat exchanger, the first liquid reservoir, the drying filter, the first condenser assembly, the four-way valve, the gas-liquid separator, and then returns to the compressor;

[0020] In the container internal temperature heating mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, the third solenoid valve, the internal heat exchanger assembly, the second liquid reservoir, the first electronic expansion valve, the plate heat exchanger, the first liquid reservoir, the drying filter, the first condenser assembly, the four-way valve, the gas-liquid separator, and then returns to the compressor;

[0021] In the energy storage battery and container internal temperature heating mode, the refrigerant flow path is: flowing out from the compressor, passing through the four-way valve, the third solenoid valve, the heat exchanger assembly in the box, the fifth solenoid valve, the energy storage battery, the third liquid reservoir, the second electronic expansion valve, the plate heat exchanger, the first liquid reservoir, the drying filter, and then flowing through the first condenser assembly, the first solenoid valve and the second condenser assembly, and then passing through the four-way valve and the gas-liquid separator and returning to the compressor.

[0022] The above-mentioned energy storage battery thermal management control method with ambient temperature control function further realizes cooling or heating of the internal temperature of the energy storage battery and / or container. The specific steps include:

[0023] Perform initial adjustments on the compressor, the fan of the first condenser assembly, the fan of the second condenser assembly, the fan of the in-box heat exchanger assembly, the first electronic expansion valve, and the second electronic expansion valve, respectively, and obtain detection data from each temperature sensor and each pressure sensor;

[0024] According to the feedback information of each temperature sensor and each pressure sensor, one of the energy storage battery cooling mode, container internal temperature cooling mode, energy storage battery and container internal temperature cooling mode, energy storage battery heating mode, container internal temperature heating mode, and energy storage battery and container internal temperature heating mode is adopted, and the states of the compressor, the fan of the first condenser assembly, the fan of the second condenser assembly, the fan of the in-box heat exchanger assembly, the first electronic expansion valve, and the second electronic expansion valve are adjusted according to the selected mode.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention utilizes direct cooling plus air cooling technology to provide cooling and heating functions for containerized battery energy storage, ensuring that the energy storage battery is used within a reasonable temperature range, reducing the attenuation of effective capacity, extending service life, and improving thermal stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a system principle diagram of an energy storage battery thermal management system with an ambient temperature control function according to an embodiment of the present invention;

[0029] Wherein: 1. Gas-liquid separator; 2. Fifth temperature sensor; 3. Fifth pressure sensor; 4. Compressor; 5. Four-way valve; 6. Third solenoid valve; 7. Fourth solenoid valve; 8. First solenoid valve; 9. First condenser assembly; 10. Second condenser assembly; 11. Dry filter; 12. First liquid reservoir; 13. Plate heat exchanger; 131. First inlet of plate heat exchanger; 132. First outlet of plate heat exchanger; 133. Second inlet of plate heat exchanger; 134. Second outlet of plate heat exchanger; 14. First pressure sensor; 15. First temperature sensor; 16. Sixth temperature sensor; 17. First electronic expansion valve; 18. Second liquid reservoir; 19. Second electronic expansion valve; 20. Third liquid reservoir; 21. Third temperature sensor; 22. Third pressure sensor; 23. Energy storage battery; 24. Fourth temperature sensor; 25. Fourth pressure sensor; 26. Second solenoid valve; 27. Second pressure sensor; 28. Second temperature sensor; 29. ​​In-box heat exchanger assembly; 30. Fifth solenoid valve. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] Example:

[0032] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, component, product, or apparatus that includes a series of steps or devices is not necessarily limited to those steps or devices that are clearly listed, but may include other steps or devices that are not clearly listed or that are inherent to these processes, methods, products, or apparatus.

[0033] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In the description of the present invention, "plurality" means at least two, such as two or three, unless otherwise specifically defined. Furthermore, unless otherwise specified or defined, the terms "mounted," "connected," and "connected" should be understood broadly, meaning, for example, fixed, removable, or integral; mechanical or electrical; direct or indirect through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] In the first aspect, the present invention provides an energy storage battery thermal management system with an ambient temperature control function, which includes a compressor 4, a first condenser 9 assembly, a second condenser assembly 10, a drying filter 11, a first liquid reservoir 12, a plate heat exchanger 13, a second liquid reservoir 18, a third liquid reservoir 20, an in-box heat exchanger assembly 29, an energy storage battery 23, and a gas-liquid separator 1. Among them, the outlet of the compressor 4 is connected to the inlet of the first condenser assembly 9 and the inlet of the second condenser assembly 10 through pipes, respectively. The outlet of the first condenser assembly 9 and the outlet of the second condenser assembly 10 are both connected to the inlet of the drying filter 11 through pipes. The outlet of the drying filter 11 is connected to the inlet of the first liquid reservoir 12 through a pipe. The outlet of the first liquid reservoir 12 is connected to the first inlet 131 of the plate heat exchanger through a pipe. The first outlet 132 of the plate heat exchanger is connected to the inlet of the second liquid reservoir 18 and the inlet of the third liquid reservoir 20 through pipes, respectively. The outlet of the second liquid reservoir 18 is connected to the inlet of the in-box heat exchanger assembly 29 through a pipe. The outlet of the third liquid reservoir 20 is connected to the inlet of the energy storage battery 23 through a pipe. The outlet of the energy storage battery 23 and the outlet of the in-box heat exchanger 29 assembly are both connected to the second inlet 133 of the plate heat exchanger through a pipe. The second outlet 134 of the plate heat exchanger is connected to the inlet of the gas-liquid separator 1 through a pipe. The outlet of the gas-liquid separator 1 is connected to the inlet of the compressor 4 through a pipe. Furthermore, the outlet of the energy storage battery 23 is also connected to the inlet of the heat exchanger assembly 29 in the box through a pipeline.

[0037] In the above embodiment, the interior of the box and the energy storage battery can be cooled or heated through different flow paths.

[0038] As an optional embodiment, in certain embodiments, a four-way valve 5 is provided on the pipe between the compressor 4 and the first condenser assembly 9 and the second condenser assembly 10. The four-way valve 5 is respectively connected to the outlet of the compressor 4, the pipe between the inlet of the first condenser assembly 9 and the inlet of the second condenser assembly 10, the pipe between the second inlet 133 and the second outlet 134 of the plate heat exchanger, and the inlet of the gas-liquid separator 1. Furthermore, a first solenoid valve 8 is provided on the pipe between the compressor 4 and the second condenser assembly 10, a second solenoid valve 26 is provided on the pipe between the energy storage battery 23 and the plate heat exchanger 13, a third solenoid valve 6 is provided on the pipe between the second inlet 133 of the plate heat exchanger and the four-way valve 5, a fourth solenoid valve 7 is provided on the pipe between the second outlet 134 of the plate heat exchanger and the four-way valve 5, and a fifth solenoid valve 30 is provided on the pipe connecting the outlet of the energy storage battery 23 and the inlet of the in-tank heat exchanger assembly 29. Furthermore, a first electronic expansion valve 17 is provided on the pipe between the first outlet 132 of the plate heat exchanger and the inlet of the second liquid reservoir 18, and a second electronic expansion valve 19 is provided on the pipe between the first outlet 132 of the plate heat exchanger and the inlet of the third liquid reservoir 20. Furthermore, a first temperature sensor 15 and a first pressure sensor 14 are provided on the pipe connected to the first outlet 132 of the plate heat exchanger, a second temperature sensor 28 and a second pressure sensor 27 are provided on the pipe connected to the outlet of the in-tank heat exchanger assembly 29, a third temperature sensor 21 and a third pressure sensor 22 are provided on the pipe connected to the inlet of the energy storage battery 23, a fourth temperature sensor 24 and a fourth pressure sensor 25 are provided on the pipe connected to the outlet of the energy storage battery 23, a fifth temperature sensor 2 and a fifth pressure sensor 3 are provided on the pipe connected to the outlet of the gas-liquid separator 1, and a sixth temperature sensor 16 for detecting the temperature within the tank is provided.

[0039] In the above embodiment, the four-way valve is a control valve with four interfaces, which can divert the refrigerant from one pipeline to multiple different pipelines, realize the multi-way diversion function, and make the flow direction of the refrigerant more flexible. At the same time, the refrigerant can also be transferred from one pipeline to another to change the flow direction, thereby realizing the switching of cooling and heating. The electronic expansion valve can adjust the opening size to control the flow of the refrigerant. The solenoid valve has a fast response speed and high control accuracy. The installation of temperature sensors and pressure sensors can obtain temperature and pressure information at any time, and make appropriate adjustments based on the information obtained to meet the operating requirements of the corresponding mode (only for cooling the energy storage battery, only for cooling the internal temperature of the container, cooling the energy storage battery and the internal temperature of the container at the same time, only for heating the energy storage battery, only for heating the internal temperature of the container, and heating the energy storage battery and the internal temperature of the container at the same time).

[0040] As an optional implementation, in some embodiments, the first condenser assembly 9, the second condenser assembly 10 and the in-box heat exchanger assembly 29 are all provided with a heat exchanger and a fan.

[0041] In the above embodiment, liquid cooling and air cooling are used in combination to perform thermal management control on the energy storage battery and the internal temperature of the container, which greatly improves the efficiency.

[0042] In a second aspect, the present invention provides a thermal management control method for an energy storage battery with an ambient temperature control function, which is used in the above-mentioned energy storage battery thermal management system with an ambient temperature control function to achieve cooling or heating of the energy storage battery and / or the internal temperature of the container.

[0043] Specifically, each component is initially adjusted, and the initial rotation speed R of the compressor 4 is Y The initial speeds of the fans of the first condenser assembly 9 and the second condenser assembly 10 are R FA1 The initial speed of the fan of the heat exchanger assembly 29 in the box is R FB1 , the initial opening degree of the first electronic expansion valve 17 is α1, and the initial opening degree of the second electronic expansion valve 19 is β1.

[0044] Related parameters: Suction temperature T 吸 , suction pressure P 吸 , valve front pressure P 阀 , valve front temperature T 阀 , detect the temperature T inside the container 箱 , Energy storage battery cooling inlet temperature T 冷进 , outlet temperature T when energy storage battery is cooled 冷出 , outlet pressure P when energy storage battery is cooling 冷出 , outlet temperature of heat exchanger components in the box T 换出 , outlet pressure of heat exchanger assembly in the box P 换出 ; Suction superheat ΔT 吸 = Suction temperature T 吸 -Suction pressure P 吸 Corresponding saturation temperature; outlet superheat ΔT when the energy storage battery is cooled 冷出 = outlet temperature of energy storage battery when cooling T 冷出 -Outlet pressure P when the energy storage battery is cooling 冷出 Corresponding saturation temperature; outlet superheat ΔT of the heat exchanger component in the box 换出 = outlet temperature of heat exchanger components in the box T 换出 -Outlet pressure P of the heat exchanger assembly in the box 换出 The corresponding saturation temperature.

[0045] When the thermal management system is only cooling the energy storage battery, after receiving the request for cooling the energy storage battery, the fan of the first condenser assembly 9 is turned on to RFA1 , the second electronic expansion valve 19 opens to step β1, the fourth solenoid valve 7 and the second solenoid valve 26 open, and the speed of the compressor 4 rises to R Y1 After each component reaches its corresponding initial value and maintains operation for a certain period of time, it is adjusted according to the control strategy. Among them, the fan speed of the first condenser component 9 is adjusted according to the pressure before the condensing valve P 阀 and the target value P 阀目标1 The difference adjustment, when P 阀 -P 阀目标1 =0, the fan speed remains unchanged; P 阀 -P 阀目标1 When P<0, the fan speed increases; 阀 -P 阀目标1 When >0, the speed of the fan decreases; the speed of the compressor 4 is adjusted according to the outlet pressure P 冷出 and the target value P 冷出目标1 The difference adjustment, when P 冷出 -P 冷出目标1 =0, the speed of compressor 4 remains unchanged; P 冷出 -P 冷出目标1 When P<0, the speed of the compressor 4 decreases; 冷出 -P 冷出目标1 >0, the speed of the compressor 4 increases; the opening degree of the second electronic expansion valve 19 is adjusted according to the outlet superheat ΔT 冷出 and target outlet superheat ΔT 冷出目标 The difference adjustment, when ΔT 冷出 -ΔT 冷出目标 =0, the opening of the second electronic expansion valve 19 remains unchanged; ΔT 冷出 -ΔT 冷出目标 When ΔT is less than 0, the opening of the second electronic expansion valve 19 decreases; 冷出 -ΔT 冷出目标 When >0, the opening of the electronic expansion valve 19 increases.

[0046] In addition, the refrigerant flows as follows: out of compressor 4, through four-way valve 5, first condenser assembly 9, filter drier 11, first liquid reservoir 12, plate heat exchanger 13, second electronic expansion valve 19, third liquid reservoir 20, energy storage battery 23, second solenoid valve 26, plate heat exchanger 13, fourth solenoid valve 7, four-way valve 5, gas-liquid separator 1, and finally back to compressor 4. This achieves cooling only for the energy storage battery.

[0047] When the thermal management system is only used to cool the internal temperature of the container, after receiving the request for cooling the internal temperature of the container, the fan of the first condenser assembly 9 is turned on to R FA1 , the fan of the heat exchanger assembly 29 in the box is turned on to R FB1, the first electronic expansion valve 17 opens to step α1, the fourth solenoid valve 7 opens, and the speed of the compressor 4 rises to R Y1 After each component reaches its corresponding initial value and maintains operation for a certain period of time, it is adjusted according to the control strategy. Among them, the fan speed of the first condenser component 9 is adjusted according to the pressure before the condensing valve P 阀 and the target value P 阀目标2 The difference adjustment, when P 阀 -P 阀目标2 =0, the fan speed remains unchanged; P 阀 -P 阀目标2 When P<0, the fan speed increases; 阀 -P 阀目标2 >0, the fan speed decreases; the speed of the compressor 4 is determined by the outlet pressure P of the heat exchanger assembly 29 in the box. 换出 and the target value P 换出目标 The difference adjustment, when P 换出 -P 换出目标 =0, the speed of compressor 4 remains unchanged; P 换出 -P 换出目标 When P<0, the speed of the compressor 4 decreases; 换出 -P 换出目标 >0, the speed of the compressor 4 increases; the opening of the first electronic expansion valve 17 is determined by the outlet superheat ΔT of the heat exchanger assembly 29 in the box. 换出 and target superheat ΔT 换出目标 The difference adjustment, when ΔT 换出 -ΔT 换出目标 =0, the opening of the first electronic expansion valve 17 remains unchanged; ΔT 换出 -ΔT 换出目标 When ΔT is less than 0, the opening of the first electronic expansion valve 17 decreases; 换出 -ΔT 换出目标 When >0, the opening degree of the first electronic expansion valve 17 increases.

[0048] Furthermore, the refrigerant flows from compressor 4, passes through four-way valve 5, first condenser assembly 9, filter drier 11, first liquid reservoir 12, plate heat exchanger 13, first electronic expansion valve 17, second liquid reservoir 18, internal heat exchanger assembly 29, plate heat exchanger 13, fourth solenoid valve 7, four-way valve 5, gas-liquid separator 1, and finally returns to compressor 4. This achieves cooling only on the interior of the container.

[0049] When the thermal management system cools the energy storage battery and the internal temperature of the container at the same time, after receiving the demand for cooling the energy storage battery and the internal temperature of the container, the fan of the first condenser assembly 9 and the fan of the second condenser assembly 10 are turned on to R FA1 , the fan speed of the heat exchanger component 29 in the box is turned to R FB1, the electronic expansion valve 17 opens to step α1, the electronic expansion valve 19 opens to step β1, the solenoid valve 7, the solenoid valve 8, and the solenoid valve 26 open, and the speed of the compressor 4 rises to R Y1 After each component reaches its corresponding initial value and maintains operation for a certain period of time, it is adjusted according to the control strategy. Among them, the fan speed of the first condenser component 9 and the fan speed of the condenser component 10 are adjusted according to the pressure before the condensing valve P 阀 and the target value P 阀目标3 The difference adjustment, when P 阀 -P 阀目标3 =0, the fan speed remains unchanged; P 阀 -P 阀目标3 When P<0, the fan speed increases; 阀 -P 阀目标3 When >0, the speed of the fan decreases; the speed of the compressor 4 is adjusted according to the outlet pressure P 冷出 and the target value P 冷出目标1 The difference adjustment, when P 冷出 -P 冷出目标1 =0, the speed of compressor 4 remains unchanged; P 冷出 -P 冷出目标1 When P<0, the speed of compressor 4 decreases; 冷出 -P 冷出目标1 >0, the speed of the compressor 4 increases; the opening degree of the second electronic expansion valve 19 is adjusted according to the outlet superheat ΔT 冷出 and target outlet superheat ΔT 冷出目标 The difference adjustment, when ΔT 冷出 -ΔT 冷出目标 =0, the opening of the second electronic expansion valve 19 remains unchanged; ΔT 冷出 -ΔT 冷出目标 <0, the opening of the second electronic expansion valve 19 decreases; ΔT 冷出 -ΔT 冷出目标 >0, the opening of the second electronic expansion valve 19 increases; while the opening of the first electronic expansion valve 17 remains unchanged; the fan speed of the heat exchanger assembly 29 in the box is adjusted according to the outlet superheat ΔT of the heat exchanger assembly 29 in the box 换出 and target outlet superheat ΔT 冷出目标 The difference adjustment, when ΔT 换出 -ΔT 冷出目标 =0, the speed of the fan of the heat exchanger assembly 29 in the box remains unchanged; ΔT 换出 -ΔT 冷出目标 When ΔT<0, the speed of the fan of the heat exchanger assembly 29 in the box increases; 换出 -ΔT 冷出目标 When >0, the speed of the fan of the heat exchanger assembly 29 in the box decreases.

[0050] Furthermore, the refrigerant flows as follows: out of compressor 4, through four-way valve 5, simultaneously through first condenser assembly 9, first solenoid valve 8, and second condenser assembly 10, then through filter drier 11, first liquid reservoir 12, and plate heat exchanger 13, then through first electronic expansion valve 17, second liquid reservoir 18, in-tank heat exchanger assembly 29, second electronic expansion valve 19, third liquid reservoir 20, energy storage battery 23, and second solenoid valve 26, then through plate heat exchanger 13, fourth solenoid valve 7, four-way valve 5, and gas-liquid separator 1, before returning to compressor 4. This achieves simultaneous cooling of the energy storage battery and the interior of the container.

[0051] When the thermal management system only heats the energy storage battery, after receiving the request for heating the energy storage battery, the four-way valve 5 is opened, the third solenoid valve 6 and the fifth solenoid valve 30 are opened, the fourth solenoid valve 7 and the second solenoid valve 26 are closed, and the fan of the first condenser assembly 9 is turned on to R FA2 , the fan speed of the heat exchanger assembly 29 in the box is turned to R FB2 , the second electronic expansion valve 19 opens to step β2, and the speed of the compressor 4 rises to R Y2 Each component reaches its corresponding initial value and maintains operation for a certain period of time, and then adjusts according to the control strategy. Among them, the speed of compressor 4 is based on the outlet pressure P when the energy storage battery is cooled. 冷出 and the target value P 热入 The difference is adjusted when P 冷出 -P 热入 = 0, the speed of compressor 4 remains unchanged; when P 冷出 -P 热入 >0, the speed of compressor 4 decreases; when P 冷出 -P 热入 When <0, the rotation speed of the compressor 4 increases.

[0052] In addition, the refrigerant flows from compressor 4, passes through four-way valve 5, fourth solenoid valve 7, plate heat exchanger 13, second solenoid valve 26, energy storage battery 23, third liquid reservoir 20, second electronic expansion valve 19, plate heat exchanger 13, first liquid reservoir 12, filter drier 11, first condenser assembly 9, four-way valve 5, gas-liquid separator 1, and finally returns to compressor 4. This achieves heating of only the energy storage battery.

[0053] When the thermal management system only heats the internal temperature of the container, after receiving the demand for heating the internal temperature of the container, the four-way valve 5 is opened, the third solenoid valve 6 is opened, and the fan of the first condenser assembly 9 is turned on to R FA2 , the fan of the heat exchanger assembly 29 in the box is turned on to R FB2 , the first electronic expansion valve 17 opens to step α2, and the speed of the compressor 4 rises to R Y2Each component reaches its corresponding initial value and maintains operation for a period of time, and then adjusts according to the control strategy. Among them, the fan speed of the first condenser component 9 is adjusted according to the suction superheat ΔT 吸 Target ΔT 吸目标 The difference adjustment, when ΔT 吸 -ΔT 吸目标 =0, the fan speed of the first condenser assembly 9 remains unchanged; ΔT 吸 -ΔT 吸目标 When ΔT<0, the fan speed of the first condenser assembly 9 increases; 吸 -ΔT 吸目标 >0, the speed of the first condenser assembly 9 decreases; the speed of the compressor 4 is adjusted according to the outlet pressure P of the heat exchanger assembly 29 in the box. 换出 and the target value P 换出目标 The difference adjustment, when P 换出 -P 换出目标 =0, the speed of compressor 4 remains unchanged; P 换出 -P 换出目标 When P<0, the speed of the compressor 4 increases; 换出 -P 换出目标 >0, the speed of the compressor 4 decreases; the opening of the first electronic expansion valve 17 is determined according to the outlet temperature T of the heat exchanger assembly 29 in the box. 换出 With target T 换出目标 The difference adjustment, when T 换出 -T 换出目标 =0, the opening of the first electronic expansion valve 17 remains unchanged; T 换出 -T 换出目标 When T<0, the opening of the first electronic expansion valve 17 decreases; 换出 -T 换出目标 When >0, the opening degree of the first electronic expansion valve 17 increases.

[0054] Furthermore, the refrigerant flows from compressor 4, passes through four-way valve 5, third solenoid valve 6, internal heat exchanger assembly 29, second liquid reservoir 18, first electronic expansion valve 17, plate heat exchanger 13, first liquid reservoir 12, filter drier 11, first condenser assembly 9, four-way valve 5, gas-liquid separator 1, and finally returns to compressor 4. This achieves heating only of the container interior.

[0055] When the thermal management system heats the energy storage battery and the internal temperature of the container at the same time, after receiving the demand for heating the energy storage battery and the internal temperature of the container, the four-way valve 5 is opened, the third solenoid valve 6, the first solenoid valve 8, and the fifth solenoid valve 30 are opened, and the fans of the first condenser assembly 9 and the second condenser assembly 10 are turned on to R FA2 , the fan speed of the heat exchanger assembly 29 in the box is turned to R FB2, the second electronic expansion valve 19 opens to step β2, and the speed of the compressor 4 rises to R Y2 After each component reaches its corresponding initial value and maintains operation for a period of time, it is adjusted according to the control strategy. Among them, the fan speed of the first condenser component 9 and the fan speed of the second condenser component 10 are adjusted according to the suction superheat ΔT 吸 Target ΔT 吸目标 The difference adjustment, when ΔT 吸 -ΔT 吸目标 =0, the speed of the fan of the first condenser assembly 9 and the fan of the second condenser assembly 10 remains unchanged; ΔT 吸 -ΔT 吸目标 When ΔT<0, the speed of the fan of the first condenser assembly 9 and the fan of the second condenser assembly 10 increases; 吸 -ΔT 吸目标 >0, the speed of the fan of the first condenser assembly 9 and the fan of the second condenser assembly 10 decreases; the speed of the compressor 4 is based on the outlet pressure P when the energy storage battery 23 is cooled. 冷出 and the target value P 热入 The difference is adjusted when P 冷出 -P 热入 = 0, the speed of compressor 4 remains unchanged; when P 冷出 -P 热入 >0, the speed of compressor 4 decreases; when P 冷出 -P 热入 <0, the speed of the compressor 4 increases; the opening of the second electronic expansion valve 19 is determined according to the outlet temperature T of the heat exchanger assembly 29 in the box. 换出 With target T 换出目标 The difference adjustment, when T 换出 -T 换出目标 =0, the opening of the second electronic expansion valve 19 remains unchanged; T 换出 -T 换出目标 When T<0, the opening of the second electronic expansion valve 19 decreases; 换出 -T 换出目标 >0, the opening of the second electronic expansion valve 19 increases; the fan speed of the heat exchanger assembly 29 in the box is adjusted according to the outlet temperature T when the energy storage battery 23 is cooled. 冷出 With target T 冷出目标 The difference adjustment, when T 冷出 -T 冷出目标 = 0, the speed of the fan of the heat exchanger assembly 29 in the box remains unchanged; T 冷出 -T 冷出目标 When T<0, the speed of the fan of the heat exchanger assembly 29 in the box decreases; 冷出 -T 冷出目标 When >0, the speed of the fan of the heat exchanger assembly 29 in the box increases.

[0056] Furthermore, the refrigerant flows as follows: from compressor 4, through four-way valve 5, third solenoid valve 6, internal heat exchanger assembly 29, fifth solenoid valve 30, energy storage battery 23, third liquid reservoir 20, second electronic expansion valve 19, plate heat exchanger 13, first liquid reservoir 12, filter drier 11, then through first condenser assembly 9, first solenoid valve 8, and second condenser assembly 10, then through four-way valve 5 and gas-liquid separator 1, and back to compressor 4. This simultaneously heats the energy storage battery and the interior of the container.

[0057] It can be seen that the present invention can cool or heat the energy storage battery and the internal temperature of the container, thereby better ensuring that the energy storage battery continues to operate safely within a suitable operating temperature range, slowing down the reduction of the energy storage battery capacity, and improving the service life and thermal stability.

[0058] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0059] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the essence of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A thermal management system for energy storage batteries with an ambient temperature control function, characterized in that: It includes: Compressor, first condenser assembly, second condenser assembly, drying filter, first liquid reservoir, plate heat exchanger, second liquid reservoir, third liquid reservoir, in-tank heat exchanger assembly, energy storage battery, gas-liquid separator; wherein the outlet of the compressor is connected to the inlet of the first condenser assembly and the inlet of the second condenser assembly respectively through pipes, the outlet of the first condenser assembly and the outlet of the second condenser assembly are both connected to the inlet of the filter drier through pipes, the outlet of the filter drier is connected to the inlet of the first liquid reservoir through a pipe, the outlet of the first liquid reservoir is connected to the first inlet of the plate heat exchanger through a pipe, the first outlet of the plate heat exchanger is connected to the inlet of the second liquid reservoir and the inlet of the third liquid reservoir through pipes, the outlet of the second liquid reservoir is connected to the inlet of the in-tank heat exchanger assembly through a pipe, the outlet of the third liquid reservoir is connected to the inlet of the energy storage battery through a pipe, the outlet of the energy storage battery and the outlet of the in-tank heat exchanger assembly are both connected to the second inlet of the plate heat exchanger through pipes, the second outlet of the plate heat exchanger is connected to the inlet of the gas-liquid separator through a pipe, and the outlet of the gas-liquid separator is connected to the inlet of the compressor through a pipe; A four-way valve is provided on the pipeline between the compressor and the first condenser assembly and the second condenser assembly, and the four-way valve is respectively connected to the outlet of the compressor, the pipeline between the inlet of the first condenser assembly and the inlet of the second condenser assembly, the pipeline between the second inlet and the second outlet of the plate heat exchanger, and the inlet of the gas-liquid separator through pipelines; A first solenoid valve is provided on the pipe between the compressor and the second condenser assembly, a second solenoid valve is provided on the pipe between the energy storage battery and the plate heat exchanger, a third solenoid valve is provided on the pipe between the second inlet of the plate heat exchanger and the four-way valve, and a fourth solenoid valve is provided on the pipe between the second outlet of the plate heat exchanger and the four-way valve.

2. The energy storage battery thermal management system with environmental temperature control function according to claim 1, characterized in that: A first electronic expansion valve is provided on the pipe between the first outlet of the plate heat exchanger and the inlet of the second liquid reservoir, and a second electronic expansion valve is provided on the pipe between the first outlet of the plate heat exchanger and the inlet of the third liquid reservoir.

3. The energy storage battery thermal management system with environmental temperature control function according to claim 2, characterized in that: A first temperature sensor and a first pressure sensor are provided on the pipe connected to the first outlet of the plate heat exchanger, a second temperature sensor and a second pressure sensor are provided on the pipe connected to the outlet of the heat exchanger assembly in the box, a third temperature sensor and a third pressure sensor are provided on the pipe connected to the inlet of the energy storage battery, a fourth temperature sensor and a fourth pressure sensor are provided on the pipe connected to the outlet of the energy storage battery, a fifth temperature sensor and a fifth pressure sensor are provided on the pipe connected to the outlet of the gas-liquid separator, and a sixth temperature sensor for detecting the temperature in the box is provided.

4. The energy storage battery thermal management system with environmental temperature control function according to claim 1, characterized in that: The outlet of the energy storage battery is also connected to the inlet of the heat exchanger assembly in the box through a pipeline.

5. The energy storage battery thermal management system with environmental temperature control function according to claim 4, characterized in that: A fifth solenoid valve is provided on the pipe connecting the outlet of the energy storage battery and the inlet of the heat exchanger assembly in the box.

6. The energy storage battery thermal management system with environmental temperature control function according to claim 1, characterized in that: The first condenser assembly, the second condenser assembly and the in-box heat exchanger assembly are all provided with a heat exchanger and a fan.

7. A thermal management control method for an energy storage battery with an ambient temperature control function, characterized in that: The energy storage battery thermal management system with an environmental temperature control function according to any one of claims 1 to 6 is used to cool or heat the internal temperature of the energy storage battery and / or the container, comprising: In the energy storage battery cooling mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, the first condenser assembly, the drying filter, the first liquid reservoir, the plate heat exchanger, the second electronic expansion valve, the third liquid reservoir, the energy storage battery, the second solenoid valve, the plate heat exchanger, the fourth solenoid valve, the four-way valve, the gas-liquid separator, and then returns to the compressor; In the container internal temperature cooling mode, the refrigerant flow path is as follows: from the compressor, through the four-way valve, the first condenser assembly, the dry filter, the first liquid reservoir, the plate heat exchanger, the first electronic expansion valve, the second liquid reservoir, the internal heat exchanger assembly, the plate heat exchanger, the fourth solenoid valve, the four-way valve, the gas-liquid separator, and then back to the compressor; In the energy storage battery and container internal temperature cooling mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, and then flows through the first condenser assembly, the first solenoid valve, and the second condenser assembly. Then, it passes through the dry filter, the first liquid reservoir, and the plate heat exchanger. Then, it flows through the first electronic expansion valve, the second liquid reservoir, the in-tank heat exchanger assembly, the second electronic expansion valve, the third liquid reservoir, the energy storage battery, the second solenoid valve, and then through the plate heat exchanger, the fourth solenoid valve, the four-way valve, and the gas-liquid separator before returning to the compressor. In the energy storage battery heating mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, the fourth solenoid valve, the plate heat exchanger, the second solenoid valve, the energy storage battery, the third liquid reservoir, the second electronic expansion valve, the plate heat exchanger, the first liquid reservoir, the drying filter, the first condenser assembly, the four-way valve, the gas-liquid separator, and then returns to the compressor; In the container internal temperature heating mode, the refrigerant flow path is as follows: it flows out from the compressor, passes through the four-way valve, the third solenoid valve, the internal heat exchanger assembly, the second liquid reservoir, the first electronic expansion valve, the plate heat exchanger, the first liquid reservoir, the drying filter, the first condenser assembly, the four-way valve, the gas-liquid separator, and then returns to the compressor; In the energy storage battery and container internal temperature heating mode, the refrigerant flow path is: flowing out from the compressor, passing through the four-way valve, the third solenoid valve, the heat exchanger assembly in the box, the fifth solenoid valve, the energy storage battery, the third liquid reservoir, the second electronic expansion valve, the plate heat exchanger, the first liquid reservoir, the drying filter, and then flowing through the first condenser assembly, the first solenoid valve and the second condenser assembly, and then passing through the four-way valve and the gas-liquid separator and returning to the compressor.

8. The energy storage battery thermal management control method with environmental temperature control function according to claim 7, characterized in that: Cooling or heating the internal temperature of the energy storage battery and / or container is achieved. The specific steps include: Perform initial adjustments on the compressor, the fan of the first condenser assembly, the fan of the second condenser assembly, the fan of the in-box heat exchanger assembly, the first electronic expansion valve, and the second electronic expansion valve, respectively, and obtain detection data from each temperature sensor and each pressure sensor; According to the feedback information of each temperature sensor and each pressure sensor, one of the energy storage battery cooling mode, container internal temperature cooling mode, energy storage battery and container internal temperature cooling mode, energy storage battery heating mode, container internal temperature heating mode, and energy storage battery and container internal temperature heating mode is adopted, and the states of the compressor, the fan of the first condenser assembly, the fan of the second condenser assembly, the fan of the in-box heat exchanger assembly, the first electronic expansion valve, and the second electronic expansion valve are adjusted according to the selected mode.

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