Battery thermal management system

Abstract

The invention discloses a battery thermal management system, which comprises a temperature acquisition module, a first circulation pipeline, a second circulation pipeline and a control module, the control module is electrically connected with the temperature acquisition module, the first circulating pipeline and the second circulating pipeline; the temperature acquisition module is used for acquiring a first temperature signal of a crew cabin and a second temperature signal of a battery cell; the control module is used for receiving the first temperature signal and the second temperature signal, obtaining a working mode instruction selected by a user and determining opening or closing of the first circulation pipeline and / or the second circulation pipeline according to the first temperature signal, the second temperature signal and different working mode instructions. By means of the system, different temperature requirements of the crew cabin and the battery cell are met, meanwhile, the mass, the size, the cost and the energy consumption of the system are reduced, the structure is simple, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicle battery thermal management systems, and in particular to a battery thermal management system. Background Art

[0002] New energy vehicles have become a research focus both domestically and internationally. As part of the vehicle's energy management system, the thermal management system interacts and constrains the overall vehicle's energy management. The thermal management system impacts the overall vehicle's system-level performance and comprehensive energy utilization, while the thermal management system's energy consumption in turn affects the overall vehicle's energy management. With the development of heat pump systems and waste heat recovery technologies, the scope of thermal management systems is expanding. Energy and thermal management technologies are becoming increasingly important technical means of energy conservation in new energy vehicles, evolving from simple thermal management of the electric drive, battery, and passenger compartment to thermal management of the entire coupled system. Consequently, the thermal management systems of new energy commercial vehicles are more complex than before.

[0003] Currently, the thermal management architecture for commercial vehicles still uses a water-cooled battery approach. However, this approach is subject to limitations of heat exchangers and often requires the installation of multiple systems, resulting in excessively high costs, high energy consumption, and large system mass and size. Summary of the Invention

[0004] The present invention provides a battery thermal management system that can meet the different temperature requirements of the passenger compartment and battery cells while reducing system mass and volume, reducing costs and system energy consumption, having a simple structure and improving user experience.

[0005] The present invention provides a battery thermal management system, comprising: a temperature acquisition module, a first circulation pipeline, a second circulation pipeline and a control module; the control module is electrically connected to the temperature acquisition module, the first circulation pipeline and the second circulation pipeline respectively;

[0006] The temperature acquisition module is used to obtain a first temperature signal of the cabin and a second temperature signal of the battery cell;

[0007] The control module is used to receive the first temperature signal and the second temperature signal, and obtain the working mode instruction selected by the user, and determine whether to open or close the first circulation pipeline and / or the second circulation pipeline according to the first temperature signal, the second temperature signal and different working mode instructions.

[0008] Optionally, the working mode instruction includes a cooling mode; the control module is further used to control the first circulation pipeline to be opened or closed according to the first temperature signal and the second temperature signal in the cooling mode.

[0009] Optionally, the first circulation pipeline includes a first refrigeration circulation loop and a second refrigeration circulation loop; the first refrigeration circulation loop is connected to the evaporator of the passenger compartment, and the second refrigeration circulation loop is connected to the heat exchange cold plate of the battery cell;

[0010] The control module is further configured to control the first refrigeration cycle to be turned on and the second refrigeration cycle to be turned off when the level of the first temperature signal and the level of the second temperature signal are the same and neither is at the highest level, or when the level of the first temperature signal is greater than the level of the second temperature signal; wherein a preset corresponding relationship exists between the first temperature signal and the level of the first temperature signal, and a preset corresponding relationship exists between the second temperature signal and the level of the second temperature signal;

[0011] When the level of the first temperature signal is lower than the level of the second temperature signal, and both the level of the first temperature signal and the level of the second temperature signal are not at the highest level, the second refrigeration cycle is controlled to be turned on and the first refrigeration cycle is turned off;

[0012] When the level of the first temperature signal is the same as the level of the second temperature signal and both are at the highest level, the second refrigeration cycle is controlled to be turned on and the first refrigeration cycle is controlled to be turned off.

[0013] Optionally, the first refrigeration cycle includes a compressor, a first solenoid valve, a condenser, a first one-way valve, a first electronic expansion valve and a gas-liquid separator;

[0014] The gas-liquid separator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the condenser through the first solenoid valve, and the output end of the condenser is connected to the evaporator of the passenger compartment through the first one-way valve and the first electronic expansion valve;

[0015] The control module is electrically connected to the first solenoid valve and the first electronic expansion valve, and is used to control the first solenoid valve and the first electronic expansion valve to open or close.

[0016] Optionally, the second refrigeration cycle includes a compressor, a second solenoid valve, a condenser, a first one-way valve, a first full-flow electronic expansion valve, and a gas-liquid separator;

[0017] The gas-liquid separator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the condenser through the second solenoid valve, and the output end of the condenser is connected to the heat exchange cold plate of the battery cell through the first one-way valve and the first full-flow electronic expansion valve;

[0018] The control module is electrically connected to the second solenoid valve and the first full-circulation electronic expansion valve, and is used to control the second solenoid valve and the first full-circulation electronic expansion valve to open or close.

[0019] Optionally, the working mode instruction includes a heating mode; the control module is further used to control the second circulation pipeline to be opened or closed according to the first temperature signal and the second temperature signal in the heating mode.

[0020] Optionally, the second circulation pipeline includes a first heating circulation loop and a second heating circulation loop; the first heating circulation loop is connected to the heat pump core of the passenger compartment, and the second heating circulation loop is connected to the heat exchange cold plate of the battery cell;

[0021] The control module is also used to control the first heating cycle to open and the second heating cycle to close when the first temperature signal is lower than the first heating temperature threshold; control the second heating cycle to open and the first heating cycle to close when the second temperature signal is lower than the second heating temperature threshold; control the first heating cycle and the second heating cycle to open when the first temperature signal is lower than the first heating temperature threshold and the second temperature signal is lower than the second heating temperature threshold, and control the second heating cycle to close when the second temperature signal is less than the second temperature upper limit.

[0022] Optionally, the first heating circulation loop includes a compressor, a third solenoid valve, a second one-way valve, a third electronic expansion valve, a water-cooled evaporator and a gas-liquid separator;

[0023] The gas-liquid separator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the heat pump core through the third solenoid valve, the output end of the heat pump core is connected to the input end of the water-cooled evaporator through the second one-way valve and the third electronic expansion valve; the output end of the water-cooled evaporator is connected to the input end of the gas-liquid separator;

[0024] The control module is electrically connected to the third solenoid valve and the third electronic expansion valve, and is used to control the third solenoid valve and the third electronic expansion valve to be opened or closed.

[0025] Optionally, the second heating cycle includes a compressor, a second full-flow electronic expansion valve, a fourth electronic expansion valve, a water-cooled evaporator and a gas-liquid separator;

[0026] The gas-liquid separator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the heat exchange cold plate through the second full-flow electronic expansion valve, the output end of the heat exchange cold plate is connected to the input end of the water-cooled evaporator through the fourth electronic expansion valve; the output end of the water-cooled evaporator is connected to the input end of the gas-liquid separator;

[0027] The control module is electrically connected to the second full-circulation electronic expansion valve and the fourth electronic expansion valve, and is used to control the second full-circulation electronic expansion valve and the fourth electronic expansion valve to be opened or closed.

[0028] Optionally, the system further includes a heat dissipation pipeline; the heat dissipation pipeline includes a water pump, a first three-way valve, a second three-way valve, a radiator, an expansion tank and a temperature sensor;

[0029] The first end of the first three-way valve is connected to the heat dissipation device, the second end is connected to one end of the radiator, and the third end is connected to the first end of the second three-way valve; the other end of the radiator is connected to the first end of the second three-way valve; the second end of the second three-way valve is connected to the heat dissipation device via a water pump, and the third end is connected to the second circulation pipeline; the expansion tank is located between the first end of the second three-way valve and the other end of the radiator; and the temperature sensor is located in the pipeline between the heat dissipation device and the first three-way valve.

[0030] The control module is electrically connected to the temperature sensor and the first three-way valve, respectively, and is used to obtain the temperature of the cooling water detected by the temperature sensor, and when the temperature of the cooling water is greater than or equal to the preset cooling water temperature threshold, control the first end and the second end of the first three-way valve to be opened, and the third end to be closed; when the temperature of the cooling water is less than the preset cooling water temperature threshold, control the first end and the third end of the first three-way valve to be opened, and the second end to be closed.

[0031] The technical solution of the present invention uses a temperature acquisition module to obtain a first temperature signal from the cabin and a second temperature signal from the battery cells. The control module receives the first cabin temperature signal and the second battery cell temperature signal and, in combination with the operating mode instruction generated when the user selects an operating mode, determines whether to open or close the first and / or second circulation pipelines based on the first and second temperature signals and the different operating mode instructions, so that the cabin and battery cells ultimately reach the temperature specified in the operating mode. This structure reduces system mass and volume, costs, and energy consumption while meeting the different temperature requirements of the cabin and battery cells. It also simplifies the structure and improves the user experience.

[0032] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic structural diagram of a battery thermal management system provided by an embodiment of the present invention;

[0035] Figure 2 A schematic structural diagram of a first circulation pipeline in a battery thermal management system in cooling mode provided by an embodiment of the present invention;

[0036] Figure 3 This is a structural schematic diagram of the second circulation pipeline in a battery thermal management system in a heating mode provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the description 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 sequence. It should be understood that the numbers used in this way can be interchanged 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 are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] In one embodiment, Figure 1 This is a schematic diagram of the structure of a battery thermal management system provided by an embodiment of the present invention. This embodiment is applicable to situations where the system energy consumption and volume are reduced while meeting the requirements of cabin temperature and battery cell temperature. Figure 1 As shown, the system includes: a temperature acquisition module 1, a first circulation pipeline 2, a second circulation pipeline 3 and a control module 4; the control module 4 is electrically connected to the temperature acquisition module 1, the first circulation pipeline 2 and the second circulation pipeline 3 respectively; the temperature acquisition module 1 is used to obtain a first temperature signal of the cabin and a second temperature signal of the battery cell; the control module 4 is used to receive the first temperature signal and the second temperature signal, and obtain the working mode instruction selected by the user, and determine whether to open or close the first circulation pipeline 2 and / or the second circulation pipeline 3 according to the first temperature signal, the second temperature signal and different working mode instructions.

[0040] The temperature acquisition module 1 is a structure for acquiring the cabin temperature and battery cell temperature. Specifically, the temperature acquisition module 1 may include, but is not limited to, a temperature sensor. Additionally, the battery cell temperature may also be acquired via a battery management system (BMS). The second temperature signal of the battery cell generally indicates the maximum temperature of the battery cell. The first circulation pipeline 2 is a pipeline loop for cooling the cabin and / or battery cells in the first operating mode. The second circulation pipeline 3 is a pipeline loop for heating the cabin and / or battery cells in the second operating mode. The first operating mode may be a cooling mode, and the second operating mode may be a heating mode. The control module 4 is the core control unit of the system, primarily configured to receive the first and second temperature signals acquired by the temperature acquisition module 1, as well as the operating mode command generated when the user selects an operating mode. Based on the first and second temperature signals and the different operating mode commands, the control module 4 determines whether to open or close the first circulation pipeline 2 and / or the second circulation pipeline 3.

[0041] Specifically, the temperature acquisition module 1 acquires a first temperature signal from the cabin and a second temperature signal from the battery cells, and transmits the first and second temperature signals to the control module 4. After receiving the first and second temperature signals from the cabin and the battery cells, the control module 4, in combination with the operating mode instruction generated when the user selects an operating mode, determines, based on the first and second temperature signals and different operating mode instructions, whether to open or close the first circulation line 2, or the second circulation line 3, or both the first and second circulation lines 2 and 3. This ensures that when the first and / or second circulation lines 2 and 3 are opened, the cabin and the battery cells ultimately reach the temperature required for the operating mode. That is, when the operating mode instruction is cooling mode, the cabin and the battery cells reach the required cooling temperature by controlling the opening of the first and / or second circulation lines 2 and 3. When the working mode instruction is the heating mode, the opening of the first circulation pipeline 2 and / or the second circulation pipeline 3 is controlled so that the cabin and the battery cells reach the temperature required for heating, thereby ensuring the comfort of the cabin occupants and the safety of the battery cells.

[0042] The technical solution of the embodiment of the present invention uses a temperature acquisition module to obtain a first temperature signal from the cabin and a second temperature signal from the battery cells. The control module receives the first cabin temperature signal and the second battery cell temperature signal and, in combination with the operating mode instruction generated when the user selects an operating mode, determines whether to open or close the first and / or second circulation pipelines based on the first and second temperature signals and the different operating mode instructions, so that the cabin and battery cells ultimately reach the temperature in the selected operating mode. Utilizing this structure, while meeting the different temperature requirements of the cabin and battery cells, it reduces system mass and volume, reduces costs and system energy consumption, has a simple structure, and improves the user experience.

[0043] In another specific embodiment, optionally, Figure 2 A schematic diagram of the structure of the first circulation pipeline in a battery thermal management system in a cooling mode provided by an embodiment of the present invention, with reference to Figure 2 As shown, the working mode instruction includes a cooling mode; the control module 4 is further configured to control the first circulation pipeline 2 to be opened or closed according to the first temperature signal and the second temperature signal in the cooling mode.

[0044] Specifically, when the control module 4 receives the user-selected working mode instruction of cooling mode, it indicates that the cabin and battery cells need to be cooled at this time. Therefore, the control module 4 will determine the cooling requirements of the cabin and battery cells based on the obtained first temperature signal and second temperature signal, and thus control the first circulation pipeline 2 to open or close according to the cooling demand.

[0045] Optionally, Table 1 is a preset relationship table between a first temperature signal and a corresponding level of the first temperature signal and a second temperature signal and a corresponding level of the second temperature signal provided in an embodiment of the present invention. Referring to Table 1, the first circulation pipeline 2 includes a first refrigeration circulation loop 21 and a second refrigeration circulation loop 22; the first refrigeration circulation loop 21 is connected to the evaporator 5 of the passenger compartment, and the second refrigeration circulation loop 22 is connected to the heat exchange cold plate 6 of the battery cell; the control module 4 is also used to control the first refrigeration circulation when the level of the first temperature signal is the same as the level of the second temperature signal and neither is at the highest level, or when the level of the first temperature signal is greater than the level of the second temperature signal. The circuit 21 is turned on and the second refrigeration cycle circuit 22 is turned off; wherein, there is a preset corresponding relationship between the first temperature signal and the level of the first temperature signal, and there is a preset corresponding relationship between the second temperature signal and the level of the second temperature signal; when the level of the first temperature signal is lower than the level of the second temperature signal, and the level of the first temperature signal and the level of the second temperature signal are not at the highest level, the second refrigeration cycle circuit 22 is controlled to be turned on and the first refrigeration cycle circuit 21 is turned off; when the level of the first temperature signal and the level of the second temperature signal are the same and both are at the highest level, the second refrigeration cycle circuit 22 is controlled to be turned on and the first refrigeration cycle circuit 21 is turned off.

[0046] The first refrigeration cycle 21 is used to cool the passenger compartment, and the second refrigeration cycle 22 is used to cool the battery cells.

[0047] Specifically, when cooling the cabin and / or battery cells, the first cabin temperature signal and the second battery cell temperature signal are both leveled based on the cabin and battery cell temperatures. In this embodiment, a preset correspondence exists between the first temperature signal and the level at which the first temperature signal is located, and a preset correspondence exists between the second temperature signal and the level at which the second temperature signal is located. Referring to Table 1, for the cabin, when the first cabin temperature signal is less than 25°C, the corresponding level is Level 1; when the first temperature signal is between 25-30°C, the corresponding level is Level 2; and when the first temperature signal is greater than 30°C, the corresponding level is Level 3. For the battery cells, when the second temperature signal is less than 35°C, the corresponding level is Level 1; when the second temperature signal is between 35-40°C, the corresponding level is Level 2; and when the second temperature signal is greater than 40°C, the corresponding level is Level 3.

[0048] After the control module 4 receives the first temperature signal and the second temperature signal, it can determine the levels corresponding to the first temperature signal and the second temperature signal, respectively, according to Table 1, and control the first refrigeration cycle 21 and / or the second refrigeration cycle 22 to be turned on or off based on the levels of the first temperature signal and the second temperature signal. In this embodiment, when the control module 4 determines that the level of the first temperature signal is the same as the level of the second temperature signal and neither is at the highest level, or when the level of the first temperature signal is greater than the level of the second temperature signal, the first refrigeration cycle 21 is controlled to be turned on and the second refrigeration cycle 22 is controlled to be turned off. That is, when the cabin temperature level is the same as the battery cell maximum temperature level, and both are at level 1 or level 2, or when the cabin temperature level is higher than the battery cell temperature level, there is no safety issue with the battery cell. Therefore, the cabin is first cooled to ensure the comfort of the cabin occupants. That is, the first refrigeration cycle 21 is controlled to be on and the second refrigeration cycle 22 is controlled to be off, ensuring that the refrigerant in the first refrigeration cycle 21 can flow to the evaporator 5 in the cabin to absorb heat from the evaporator 5 and achieve cabin cooling. When the control module 4 determines that the level of the first temperature signal is lower than the level of the second temperature signal, and that neither the first temperature signal nor the second temperature signal is at the highest level, the second refrigeration cycle 22 is controlled to be on and the first refrigeration cycle 21 is controlled to be off. That is, when the cabin temperature level is lower than the battery cell maximum temperature level and neither is at level 3, that is, when the cabin temperature level is level 1 and the battery cell maximum temperature level is level 2, the battery cell cooling demand is greater than the cabin cooling demand. Therefore, the control module 4 will control the second refrigeration cycle 22 to open and the first refrigeration cycle 21 to close, ensuring that the refrigerant in the second refrigeration cycle 22 can flow to the heat exchange cold plate 6 of the battery cell to absorb heat from the heat exchange cold plate 6, thereby cooling the battery cell and ensuring that the battery cell does not overheat and cause safety problems. When the control module 4 determines that the level of the first temperature signal and the second temperature signal are the same and both are at the highest level, that is, level 3, the second refrigeration cycle 22 is controlled to open and the first refrigeration cycle 21 is controlled to close. That is to say, when the cabin temperature level and the battery cell temperature level are both at level 3, the battery cell temperature is too high and there is a safety risk. Therefore, the battery cell needs to be refrigerated and cooled first. At this time, the control module 4 controls the second refrigeration cycle 22 to open and the first refrigeration cycle 21 to close, ensuring that the refrigerant in the second refrigeration cycle 22 can flow to the heat exchange cold plate 6 of the battery cell to absorb the heat of the heat exchange cold plate 6, thereby achieving refrigeration and cooling of the battery cell, and ensuring that the battery cell will not cause safety problems due to overheating.

[0049] Table 1

[0050]

[0051] Optional, continue to refer to Figure 2 The first refrigeration cycle 21 includes a compressor 211, a first solenoid valve SOV1, a condenser 212, a first one-way valve 213, a first electronic expansion valve EVX1 and a gas-liquid separator 214; the gas-liquid separator 214 is connected to the input end of the compressor 211, the output end of the compressor 211 is connected to the input end of the condenser 212 through the first solenoid valve SOV1, and the output end of the condenser 212 is connected to the evaporator 5 of the passenger compartment through the first one-way valve 213 and the first electronic expansion valve EVX1; the control module 4 is electrically connected to the first solenoid valve SOV1 and the first electronic expansion valve EVX1, and is used to control the first solenoid valve SOV1 and the first electronic expansion valve EVX1 to be opened or closed.

[0052] Compressor 211 provides power for refrigerant circulation. The motor drives the rotating rotor mechanism of compressor 21, compressing the low-temperature, low-pressure refrigerant gas drawn into the intake chamber into a high-temperature, high-pressure superheated gas. The first solenoid valve SOV1 controls the flow direction of the refrigerant. The condenser 212 exchanges heat between the refrigerant and the ambient air, transferring a significant amount of heat from the high-temperature, high-pressure superheated refrigerant gas to the ambient air, condensing the refrigerant into a high-temperature, high-pressure subcooled refrigerant liquid. The first check valve 213 ensures that refrigerant flows in only one direction, preventing backflow. This helps maintain the system's circulation and protects the compressor from damage caused by reverse flow. The first electronic expansion valve EVX1 controls the refrigerant flow rate entering the evaporator, thereby controlling the evaporator's superheat and cooling efficiency. The gas-liquid separator 214 separates the gas and liquid in the refrigerant, ensuring that only gaseous refrigerant enters the compressor, preventing liquid hammer and protecting compressor 211.

[0053] Specifically, by electrically connecting the control module 4 with the first solenoid valve SOV1 and the first electronic expansion valve EVX1, when the control module 4 controls the first refrigeration cycle 21 to open, it essentially controls the first solenoid valve SOV1 and the first electronic expansion valve EVX1 to open. At this time, the compressor 211 compresses the sucked low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure superheated gas, and the high-pressure, high-temperature superheated gas enters the condenser 212 through the first solenoid valve SOV1. The condenser 212 transfers a large amount of heat of the high-temperature, high-pressure refrigerant superheated gas to the ambient air. After the refrigerant is condensed and liquefied into a high-temperature, high-pressure refrigerant supercooled liquid, the refrigerant supercooled liquid passes through the first electronic expansion valve EVX1, and its pressure and temperature are reduced. Part of the refrigerant evaporates and becomes a low-temperature, low-pressure two-phase mixture. The low-temperature, low-pressure refrigerant enters the evaporator 5, and after absorbing the heat in the evaporator 5, the temperature of the low-temperature, low-pressure refrigerant rises and evaporates into gas, and the temperature of the evaporator 5 decreases, thereby achieving a cooling effect on the evaporator 5. The evaporated refrigerant gas returns to the gas-liquid separator 214, which separates the gas and liquid in the refrigerator to ensure that only the gas refrigerator is sucked into the compressor 211, and repeats the above process to form a closed refrigeration cycle. In addition, the control module 4 can control the opening size of the first electronic expansion valve EVX1 when controlling it, so as to ensure that the superheat degree of the evaporator 5 after cooling is 5K by controlling the opening size of the first electronic expansion valve EVX1. In addition, referring to Figure 2 In this embodiment, a one-way valve is further provided between the evaporator 5 and the gas-liquid separator 214 to ensure that the refrigerant gas only flows from the evaporator 5 to the gas-liquid separator 214 and does not flow in the reverse direction, thereby ensuring the refrigeration effect.

[0054] Optional, continue to refer to Figure 2 The second refrigeration cycle 22 includes a compressor 221, a second solenoid valve SOV2, a condenser 222, a first one-way valve 223, a first full-circulation electronic expansion valve EVX2 and a gas-liquid separator 224; the gas-liquid separator 224 is connected to the input end of the compressor 221, and the output end of the compressor 221 is connected to the input end of the condenser 222 through the second solenoid valve SOV2, and the output end of the condenser 222 is connected to the heat exchange cold plate 6 of the battery cell through the first one-way valve 223 and the first full-circulation electronic expansion valve EVX2; the control module 4 is electrically connected to the second solenoid valve SOV2 and the first full-circulation electronic expansion valve EVX2, and is used to control the second solenoid valve SOV2 and the first full-circulation electronic expansion valve EVX2 to be opened or closed.

[0055] The first full-flow electronic expansion valve EVX2 is used to control the refrigerant flow rate entering the heat exchange cold plate 6, thereby controlling the superheat and cooling effect of the heat exchange cold plate 6. In addition, to simplify the system structure, the compressor 221 in the second refrigeration cycle 22 is reused with the compressor 211 in the first refrigeration cycle 21. The second solenoid valve SOV2 in the second refrigeration cycle 22 is reused with the first solenoid valve SOV1 in the first refrigeration cycle 21. The first one-way valve 223 in the second refrigeration cycle 22 is reused with the first one-way valve 213 in the first refrigeration cycle 21. The gas-liquid separator 224 in the second refrigeration cycle 22 is reused with the gas-liquid separator 214 in the first refrigeration cycle 21.

[0056] Specifically, by electrically connecting the control module 4 with the second solenoid valve SOV2 and the first full-circulation electronic expansion valve EVX2, when the control module 4 controls the second refrigeration cycle 22 to be opened, it essentially controls the second solenoid valve SOV2 and the first full-circulation electronic expansion valve EVX2 to be opened. At this time, the compressor 221 compresses the sucked low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure superheated gas, and the high-pressure, high-temperature superheated gas enters the condenser 222 through the second solenoid valve SOV2. The condenser 222 transfers a large amount of heat of the high-temperature, high-pressure refrigerant superheated gas to the ambient air. After the refrigerant is condensed and liquefied into a high-temperature, high-pressure refrigerant supercooled liquid, the refrigerant supercooled liquid passes through the first full-circulation electronic expansion valve EVX2, and its pressure and temperature are reduced. Part of the refrigerant evaporates and becomes a low-temperature, low-pressure two-phase mixture. The low-temperature, low-pressure refrigerant enters the heat exchange cold plate 6, and after absorbing the heat in the heat exchange cold plate 6, the temperature of the low-temperature, low-pressure refrigerant rises and evaporates into gas, and the temperature of the heat exchange cold plate 6 is reduced, thereby achieving a cooling effect on the heat exchange cold plate 6. The evaporated refrigerant gas returns to the gas-liquid separator 224, which separates the gas and liquid in the refrigerator, ensuring that only the gas is drawn into the compressor 221. The above process is repeated, forming a closed refrigeration cycle. In addition, when controlling the first full-circulation electronic expansion valve EVX2, the control module 4 can control its opening size to ensure that the superheat of the heat exchange cold plate 6 after cooling is 3K by controlling the opening of the first full-circulation electronic expansion valve EVX2. In addition, when the control module 4 determines that the cabin temperature level and the battery cell maximum temperature level are both at the highest level 3, the superheat of the heat exchange cold plate 6 after cooling is ensured to be 1K by controlling the opening of the first full-circulation electronic expansion valve EXV2.

[0057] It should be noted that in this embodiment, a solenoid valve is also provided between the heat exchange cold plate 6 and the gas-liquid separator 224. When the control module 4 controls the second refrigeration cycle 22 to open, the solenoid valve must be controlled to be in an open state at the same time so that the refrigerant gas evaporated in the heat exchange cold plate 6 can flow to the gas-liquid separator 224.

[0058] In another specific embodiment, optionally, Figure 3 This is a schematic diagram of the structure of the second circulation pipeline in a battery thermal management system in a heating mode provided by an embodiment of the present invention, with reference to Figure 3 As shown, the working mode instruction includes a heating mode; the control module 4 is further configured to control the second circulation pipeline 3 to be opened or closed according to the first temperature signal and the second temperature signal in the heating mode.

[0059] Specifically, when the control module 4 receives the user-selected working mode instruction of heating mode, it indicates that the crew cabin and battery cells need to be heated at this time. Therefore, the control module 4 will determine the heating requirements of the crew cabin and battery cells based on the obtained first temperature signal and second temperature signal, and thus control the second circulation pipeline 3 to open or close according to different needs.

[0060] Optional, continue to refer to Figure 3 As shown, the second circulation pipeline 3 includes a first heating circulation loop 31 and a second heating circulation loop 32; the first heating circulation loop 31 is connected to the heat pump core 9 of the passenger compartment, and the second heating circulation loop 32 is connected to the heat exchange cold plate 6 of the battery cell; the control module 4 is also used to control the first heating circulation loop 31 to be opened and the second heating circulation loop 32 to be closed when the first temperature signal is lower than the first heating temperature threshold; when the second temperature signal is lower than the second heating temperature threshold, control the second heating circulation loop 32 to be opened and the first heating circulation loop 31 to be closed; when the first temperature signal is lower than the first heating temperature threshold and the second temperature signal is lower than the second heating temperature threshold, control the first heating circulation loop 31 and the second heating circulation loop 32 to be opened, and control the second heating circulation loop 32 to be closed when the second temperature signal is less than the second temperature upper limit.

[0061] The first heating cycle 31 is used to heat the passenger compartment, and the second heating cycle 32 is used to heat the battery cells.

[0062] Specifically, when heating the cabin and / or the battery cells, after the control module 4 receives the first temperature signal and the second temperature signal, it controls the first heating circuit 31 and / or the second heating circuit 32 to be turned on or off according to the first temperature signal and the second temperature signal. In this embodiment, when the control module 4 determines that the first temperature signal is lower than the first heating temperature threshold, the second temperature signal can be understood as being within the normal heating temperature range. In this case, only the cabin has a heating demand, and the battery cells do not. Therefore, the control module 4 controls the first heating circuit 31 to be turned on and the second heating circuit 32 to be turned off, ensuring that the refrigerant in the first heating circuit 31 can flow into the heat pump core 9 in the cabin to provide heat to the heat pump core 9 and achieve heating of the cabin.

[0063] When the control module 4 determines that the second temperature signal is lower than the second heating temperature threshold, the first temperature signal can be understood to be in the normal heating temperature range. Only the battery cells have a heating demand, and the crew cabin has no heating demand. Therefore, the control module 4 controls the second heating circulation loop 32 to open and the first heating circulation loop 31 to close, ensuring that the refrigerant in the second heating circulation loop 32 can flow to the heat exchange cold plate 6 of the battery cells to provide heat to the heat exchange cold plate 6 and achieve heating of the battery cells.

[0064] When the control module 4 determines that the first temperature signal is lower than the first heating temperature threshold and the second temperature signal is lower than the second heating temperature threshold, indicating that both the cabin and the battery cells require heating, the control module 4 controls the first heating loop 31 and the second heating loop 32 to open, ensuring that the refrigerant in the first heating loop 31 can flow to the heat pump core 9 in the cabin to provide heat to the heat pump core 9 and achieve cabin heating; and the refrigerant in the second heating loop 32 can flow to the heat exchange cold plate 6 of the battery cells to provide heat to the heat exchange cold plate 6 and achieve battery heating. In addition, when heating the cabin and battery cells simultaneously, to ensure the performance of the battery cells, the control module 4 needs to determine the second temperature signal of the battery cells in real time and control the second heating loop 32 to close when the second temperature signal is lower than the second temperature upper limit to prevent local overheating of the battery cells and extend the battery cell life. At this time, the overheating degree of the cabin and battery cells is 3K.

[0065] Optionally, the first heating cycle 31 includes a compressor 311, a third solenoid valve SOV3, a second one-way valve 312, a third electronic expansion valve EXV3, a water-cooled evaporator 313 and a gas-liquid separator 314; the gas-liquid separator 314 is connected to the input end of the compressor 311, the output end of the compressor 311 is connected to the input end of the heat pump core 9 through the third solenoid valve SOV3, and the output end of the heat pump core 9 is connected to the input end of the water-cooled evaporator 313 through the second one-way valve 312 and the third electronic expansion valve EXV3; the output end of the water-cooled evaporator 313 is connected to the input end of the gas-liquid separator 314; the control module 4 is electrically connected to the third solenoid valve SOV3 and the third electronic expansion valve EXV3, and is used to control the third solenoid valve SOV3 and the third electronic expansion valve EXV3 to be opened or closed.

[0066] Among them, the third solenoid valve SOV3 is used to control whether the refrigerant flows to the heat pump core 9. The second one-way valve 312 is used to ensure that the refrigerant flows in only one direction to prevent backflow, which helps to maintain the circulation flow of the system and protect the compressor from damage caused by reverse flow. The third electronic expansion valve EVX3 is used to control the flow of refrigerant entering the heat pump core 9, thereby controlling the superheat and heating effect of the heat pump core 9. The water-cooled evaporator 313 is a heat exchange device used in the heating system. Its main function is to utilize the liquid refrigerant to absorb the heat of the coolant (such as water) when evaporating (boiling) at low pressure, so that the absorbed heat can achieve the purpose of heating the passenger compartment and battery cells.

[0067] Specifically, by electrically connecting the control module 4 with the third solenoid valve SOV3 and the third electronic expansion valve EXV3, when the control module 4 controls the first heating cycle 31 to open, it essentially controls the third solenoid valve SOV3 and the third electronic expansion valve EXV3 to open. At this time, the heat absorbed by the water-cooled evaporator 313 from the outside world (such as the heat dissipation water circuit) is sent to the compressor 311 through the gas-liquid separator 314. The compressor 311 compresses the refrigerant into a high-pressure and high-temperature superheated gas and then enters the heat pump core 9 through the third solenoid valve SOV3. The high-pressure and high-temperature superheated gas releases heat in the heat pump core 9 and condenses into liquid. The liquid refrigerant is reduced in pressure and temperature through the second one-way valve 312 and the third electronic expansion valve EXV3 and then flows to the water-cooled evaporator 313. The water-cooled evaporator 313 absorbs heat and evaporates into gas, which is sucked into the compressor 311 after passing through the gas-liquid separator 314, thereby realizing the heating cycle of the heat pump core 9. In addition, the control module 4 can control the opening of the third electronic expansion valve EXV3 when controlling the third electronic expansion valve EXV3, so as to ensure that the superheat degree of the heat pump core 9 after heating is 3K by controlling the opening of the third electronic expansion valve EXV3.

[0068] Optionally, the second heating cycle 32 includes a compressor 321, a second full-circulation electronic expansion valve EXV4, a fourth electronic expansion valve EXV5, a water-cooled evaporator 322 and a gas-liquid separator 323; the gas-liquid separator 323 is connected to the input end of the compressor 321, the output end of the compressor 321 is connected to the input end of the heat exchange cold plate 6 through the second full-circulation electronic expansion valve EXV4, and the output end of the heat exchange cold plate 6 is connected to the input end of the water-cooled evaporator 322 through the fourth electronic expansion valve EXV5; the output end of the water-cooled evaporator 322 is connected to the input end of the gas-liquid separator 323; the control module 4 is electrically connected to the second full-circulation electronic expansion valve EXV4 and the fourth electronic expansion valve EXV5, and is used to control the second full-circulation electronic expansion valve EXV4 and the fourth electronic expansion valve EXV5 to open or close.

[0069] The compressor and gas-liquid separator in the second circulation pipeline 3 and the first circulation pipeline 2 are reused. The fourth electronic expansion valve EXV5 in the second heating circulation loop 32 and the third electronic expansion valve EXV3 in the first heating circulation loop 31 are reused. The water-cooled evaporator 322 in the second heating circulation loop 32 and the water-cooled evaporator 313 in the first heating circulation loop 31 are reused.

[0070] Specifically, by electrically connecting the control module 4 with the second full-circulation electronic expansion valve EXV4 and the fourth electronic expansion valve EXV5, when the control module 4 controls the second heating cycle loop 32 to be opened, it essentially controls the second full-circulation electronic expansion valve EXV4 and the fourth electronic expansion valve EXV5 to be opened. At this time, the heat absorbed by the water-cooled evaporator 322 from the outside world (such as the heat dissipation water circuit) is sent to the compressor 321 through the gas-liquid separator 314. The compressor 321 compresses the refrigerant into a high-pressure and high-temperature superheated gas and then enters the heat exchange cold plate 6 through the second full-circulation electronic expansion valve EXV4. The high-pressure and high-temperature superheated gas releases heat in the heat exchange cold plate 6 and condenses into liquid. The liquid refrigerant is reduced in pressure and temperature through the fourth electronic expansion valve EXV5 and then flows to the water-cooled evaporator 322. The water-cooled evaporator 322 absorbs heat and evaporates into gas, which is then sucked into the compressor 311 after passing through the gas-liquid separator 323, thereby realizing the heating cycle of the heat exchange cold plate 6. In addition, the control module 4 can control the opening of the fourth electronic expansion valve EXV5 to ensure that the superheat degree of the heat exchange cold plate 6 after heating is 3K by controlling the opening of the fourth electronic expansion valve EXV5. Figure 3 In this embodiment, a full-circulation electronic expansion valve is further provided between the heat exchange cold plate 6 and the water-cooled evaporator 322 to ensure that the evaporated refrigerant liquid flows to the water-cooled evaporator 322 after being reduced in pressure and temperature through the full-circulation electronic expansion valve and the fourth electronic expansion valve EXV5.

[0071] Optional, continue to refer to Figure 2 and Figure 3The system also includes a heat dissipation pipeline 7; the heat dissipation pipeline 7 includes a water pump 71, a first three-way valve 72, a second three-way valve 73, a radiator 74, an expansion tank 75 and a temperature sensor 76; the first end of the first three-way valve 72 is connected to the heat dissipation device 8, the second end is connected to one end of the radiator 74, and the third end is connected to the first end of the second three-way valve 73; the other end of the radiator 74 is connected to the first end of the second three-way valve 73; the second end of the second three-way valve 73 is connected to the heat dissipation device 8 through the water pump 71, and the third end is connected to the second circulation pipeline 3; the expansion tank 75 is located at the second three-way valve 7 3 and the other end of the radiator 74; the temperature sensor 76 is located in the pipeline between the heat dissipation device 8 and the first three-way valve 72; the control module 4 is electrically connected to the temperature sensor 76 and the first three-way valve 72, respectively, for obtaining the temperature of the cooling water detected by the temperature sensor 76, and when the temperature of the cooling water is greater than or equal to a preset cooling water temperature threshold, controlling the first end and the second end of the first three-way valve 72 to open and the third end to close; when the temperature of the cooling water is less than the preset cooling water temperature threshold, controlling the first end and the third end of the first three-way valve 72 to open and the second end to close.

[0072] Among them, the water pump 71 is the power source in the heat dissipation pipeline 7, which is responsible for promoting the circulation of the coolant in the loop. The first three-way valve 72 and the second three-way valve 73 are both valves that can control three flow directions and can mix or divert fluids. The radiator 74 is a heat exchange device used to dissipate heat in the coolant to the surrounding environment to achieve a cooling process. The expansion tank 75 is a container for accommodating the coolant whose volume changes due to temperature changes, preventing the coolant from overflowing the system when it expands due to heat, and providing replenishment when the coolant cools and contracts to maintain a stable pressure in the system. The heat dissipation device 8 may include but is not limited to an electronic control unit and a motor. The temperature sensor 76 is used to obtain the temperature of the cooling water after passing through the heat dissipation device 8.

[0073] Specifically, by electrically connecting the control module 4 to the temperature sensor 76, the first three-way valve 72 and the second three-way valve 73 respectively, the control module 4 will receive the temperature of the cooling water after flowing through the heat dissipation device 8 obtained by the temperature sensor 76, and when it is determined that the temperature of the cooling water is greater than or equal to the preset cooling water temperature threshold, it indicates that the temperature of the heat dissipation device 8 is too high and needs to be cooled and dissipated. Then the control module 4 controls the first end and the second end of the first three-way valve 72 to be opened, and the third end to be closed, so that the water flowing out of the water pump 1 flows through the heat dissipation device 8 and then passes through the first three-way valve 72 and flows from the second end to the radiator 74. The radiator 74 dissipates heat into the air, so that the temperature of the water is lowered and then flows to the water pump through the first end and the second end of the second three-way valve 73, thereby realizing water circulation. When the control module 4 determines that the cooling water temperature is less than a preset cooling water temperature threshold, indicating that the temperature of the heat dissipation device 8 is normal and no cooling or heat dissipation is required, the control module 4 controls the first and third ends of the first three-way valve 72 to open, and the second end to close. This allows water flowing through the heat dissipation device 8 to flow directly through the first and second ends of the second three-way valve 73 to the water pump 1, achieving water circulation. Furthermore, in heating mode, the second three-way valve 73 communicates with the water-cooled evaporator 313, allowing it to absorb heat from the water in the heat dissipation pipeline 7, thereby heating the passenger compartment and battery cells. Furthermore, in cooling mode, the control module 4 is also electrically connected to the second three-way valve 73. While controlling the first three-way valve 72, it also controls the first and second ends of the second three-way valve 73 to open, and the third end to close, achieving water circulation.

[0074] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0075] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A battery thermal management system, characterized in that: include: A temperature acquisition module, a first circulation pipeline, a second circulation pipeline and a control module; the control module is electrically connected to the temperature acquisition module, the first circulation pipeline and the second circulation pipeline respectively; The temperature acquisition module is used to acquire a first temperature signal of the cabin and a second temperature signal of the battery cell; The control module is used to receive the first temperature signal and the second temperature signal, and obtain the working mode instruction selected by the user, and determine whether to open or close the first circulation pipeline and / or the second circulation pipeline based on the first temperature signal, the second temperature signal and different working mode instructions.

2. The battery thermal management system according to claim 1, characterized in that: The working mode instruction includes a cooling mode; the control module is further configured to control the first circulation pipeline to be opened or closed according to the first temperature signal and the second temperature signal in the cooling mode.

3. The battery thermal management system according to claim 2, characterized in that: The first circulation pipeline includes a first refrigeration circulation loop and a second refrigeration circulation loop; the first refrigeration circulation loop is connected to the evaporator of the passenger compartment, and the second refrigeration circulation loop is connected to the heat exchange cold plate of the battery cell; The control module is further configured to control the first refrigeration cycle to be turned on and the second refrigeration cycle to be turned off when the level of the first temperature signal and the level of the second temperature signal are the same and neither is at the highest level, or when the level of the first temperature signal is greater than the level of the second temperature signal; wherein a preset correspondence exists between the first temperature signal and the level of the first temperature signal, and a preset correspondence exists between the second temperature signal and the level of the second temperature signal; When the level of the first temperature signal is lower than the level of the second temperature signal, and neither the level of the first temperature signal nor the level of the second temperature signal is at the highest level, controlling the second refrigeration cycle to be turned on and the first refrigeration cycle to be turned off; When the level of the first temperature signal is the same as the level of the second temperature signal and both are at the highest level, the second refrigeration cycle is controlled to be turned on and the first refrigeration cycle is controlled to be turned off.

4. The battery thermal management system according to claim 3, characterized in that: The first refrigeration cycle includes a compressor, a first solenoid valve, a condenser, a first one-way valve, a first electronic expansion valve and a gas-liquid separator; The gas-liquid separator is in communication with the input end of the compressor, the output end of the compressor is in communication with the input end of the condenser via the first solenoid valve, and the output end of the condenser is in communication with the evaporator of the passenger compartment via the first one-way valve and the first electronic expansion valve; The control module is electrically connected to the first solenoid valve and the first electronic expansion valve, and is used to control the first solenoid valve and the first electronic expansion valve to be opened or closed.

5. The battery thermal management system according to claim 3, characterized in that: The second refrigeration cycle includes a compressor, a second solenoid valve, a condenser, a first one-way valve, a first full-flow electronic expansion valve and a gas-liquid separator; The gas-liquid separator is connected to the input end of the compressor, the output end of the compressor is connected to the input end of the condenser through the second solenoid valve, and the output end of the condenser is connected to the heat exchange cold plate of the battery cell through the first one-way valve and the first full-flow electronic expansion valve; The control module is electrically connected to the second solenoid valve and the first full-circulation electronic expansion valve, and is used to control the second solenoid valve and the first full-circulation electronic expansion valve to be opened or closed.

6. The battery thermal management system according to claim 1, characterized in that: The working mode instruction includes a heating mode; the control module is further configured to control the second circulation pipeline to be opened or closed according to the first temperature signal and the second temperature signal in the heating mode.

7. The battery thermal management system according to claim 6, characterized in that: The second circulation pipeline includes a first heating circulation loop and a second heating circulation loop; the first heating circulation loop is connected to the heat pump core of the passenger compartment, and the second heating circulation loop is connected to the heat exchange cold plate of the battery cell; The control module is further configured to control the first heating cycle to be turned on and the second heating cycle to be turned off when the first temperature signal is lower than a first heating temperature threshold; control the second heating cycle to be turned on and the first heating cycle to be turned off when the second temperature signal is lower than a second heating temperature threshold; control the first heating cycle and the second heating cycle to be turned on when the first temperature signal is lower than the first heating temperature threshold and the second temperature signal is lower than the second heating temperature threshold, and control the second heating cycle to be turned off when the second temperature signal is lower than a second temperature upper limit.

8. The battery thermal management system according to claim 7, characterized in that: The first heating circulation loop includes a compressor, a third solenoid valve, a second one-way valve, a third electronic expansion valve, a water-cooled evaporator and a gas-liquid separator; The gas-liquid separator is in communication with the input end of the compressor, the output end of the compressor is in communication with the input end of the heat pump core via the third solenoid valve, the output end of the heat pump core is in communication with the input end of the water-cooled evaporator via the second one-way valve and the third electronic expansion valve; the output end of the water-cooled evaporator is in communication with the input end of the gas-liquid separator; The control module is electrically connected to the third solenoid valve and the third electronic expansion valve, and is used to control the third solenoid valve and the third electronic expansion valve to be opened or closed.

9. The battery thermal management system according to claim 7, characterized in that: The second heating cycle includes a compressor, a second full-flow electronic expansion valve, a fourth electronic expansion valve, a water-cooled evaporator and a gas-liquid separator; The gas-liquid separator is in communication with the input end of the compressor, the output end of the compressor is in communication with the input end of the heat exchange cold plate via the second full-flow electronic expansion valve, the output end of the heat exchange cold plate is in communication with the input end of the water-cooled evaporator via the fourth electronic expansion valve; the output end of the water-cooled evaporator is in communication with the input end of the gas-liquid separator; The control module is electrically connected to the second full-circulation electronic expansion valve and the fourth electronic expansion valve, and is used to control the second full-circulation electronic expansion valve and the fourth electronic expansion valve to be opened or closed.

10. The battery thermal management system according to claim 1, characterized in that: It also includes a heat dissipation pipeline; the heat dissipation pipeline includes a water pump, a first three-way valve, a second three-way valve, a radiator, an expansion tank and a temperature sensor; The first end of the first three-way valve is in communication with the heat dissipation device, the second end is in communication with one end of the radiator, and the third end is in communication with the first end of the second three-way valve; the other end of the radiator is in communication with the first end of the second three-way valve; the second end of the second three-way valve is in communication with the heat dissipation device via the water pump, and the third end is in communication with the second circulation pipeline; the expansion tank is located between the first end of the second three-way valve and the other end of the radiator; and the temperature sensor is located in the pipeline between the heat dissipation device and the first three-way valve. The control module is electrically connected to the temperature sensor and the first three-way valve respectively, and is used to obtain the temperature of the cooling water detected by the temperature sensor, and when the temperature of the cooling water is greater than or equal to a preset cooling water temperature threshold, control the first end and the second end of the first three-way valve to be opened, and the third end to be closed; when the temperature of the cooling water is less than the preset cooling water temperature threshold, control the first end and the third end of the first three-way valve to be opened, and the second end to be closed.

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