Battery liquid cooling system and process

Abstract

The invention provides a battery liquid cooling system and process, and particularly relates to the technical field of battery thermal management, the system comprises a cooling liquid circulation device, the cooling liquid circulation device comprises a liquid cooling plate and a cooling liquid circulation pipeline, the cooling liquid circulation pipeline is provided with a first reversing valve, and an electric heating device, an air cooling heat dissipation device and a heat exchange pipeline which are connected in parallel; the first reversing valve is used for switching the communication state of the cooling liquid circulation pipeline with the electric heating equipment and the air cooling heat dissipation equipment; the temperature control device comprises refrigerant compression equipment, condensation equipment, heat exchange equipment and a second reversing valve; the second reversing valve is respectively communicated with an outlet of the refrigerant compression equipment, an inlet of the refrigerant compression equipment, the condensing equipment and a first channel of the heat exchange equipment, and is used for switching communication states of the outlet and the inlet of the refrigerant compression equipment with the condensing equipment and the first channel; the condensing device communicates with the first channel, and the second channel of the heat exchange device communicates with the heat exchange pipeline. The comprehensive energy efficiency of the battery liquid cooling system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a battery liquid cooling system and process. Background Art

[0002] With the development of new energy vehicles and energy storage systems, liquid cooling technology is being used more and more widely. The core requirement is to ensure that the battery pack can operate efficiently and stably at the optimal operating temperature. Liquid cooling technology usually uses ethylene glycol aqueous solution as the cooling medium, because ethylene glycol has good thermal stability and antifreeze properties and can work effectively in a wide temperature range. A water pump drives the coolant to flow in a closed circulation system. The coolant flows through the liquid cooling plate and contacts the battery, thereby absorbing the heat generated by the battery to achieve a cooling effect. In order to adapt to temperature changes under different environmental conditions, it is also necessary to be able to adjust the temperature of the coolant.

[0003] At present, most battery liquid cooling systems use a refrigeration unit to cool the coolant, such as Figure 1 As shown, the refrigeration unit uses components such as a compressor to remove heat from the coolant to reduce the temperature of the coolant. However, this method consumes a lot of energy during the refrigeration process. On the other hand, when the ambient temperature is low, the system also needs to use an electric heater to heat the coolant to prevent the coolant from freezing and keep the battery working within a suitable temperature range. The electric heater directly converts electrical energy into thermal energy. Although it is simple and effective, this method has low energy efficiency and will result in additional energy loss. It can be seen that the comprehensive energy efficiency of the traditional battery liquid cooling system is not high. Summary of the invention

[0004] In order to solve at least one disadvantage of the above-mentioned prior art, the present application provides a battery liquid cooling system, comprising:

[0005] A cooling liquid circulation device, comprising a liquid cooling plate and a cooling liquid circulation pipeline, wherein the cooling liquid in the liquid cooling plate is used for heat exchange with a target battery; one end of the cooling liquid circulation pipeline is connected to the liquid cooling plate at a first end of the liquid cooling plate, and the other end of the cooling liquid circulation pipeline is connected to the liquid cooling plate at a second end of the liquid cooling plate; a water pump is arranged near the first end of the cooling liquid circulation pipeline, and the water pump is used to lead the cooling liquid in the liquid cooling plate out of the first end, and flow through the cooling liquid circulation pipeline and return to the liquid cooling plate from the second end; an electric heating device, an air-cooled heat dissipation device and a heat exchange pipeline are arranged in parallel on the cooling liquid circulation pipeline; a first reversing valve is arranged on the cooling liquid circulation pipeline, and the first reversing valve is used to switch the connection state of the cooling liquid circulation pipeline with the electric heating device and the air-cooled heat dissipation device;

[0006] The temperature control device includes a refrigerant compression device, a condensing device, a heat exchange device and a second reversing valve; the second reversing valve is respectively connected to the outlet of the refrigerant compression device, the inlet of the refrigerant compression device, the condensing device, and the first channel of the heat exchange device, and the second reversing valve is used to switch the connection state between the outlet of the refrigerant compression device and the condensing device and the first channel, and to switch the connection state between the inlet of the refrigerant compression device and the condensing device and the first channel; the condensing device is connected to the first channel, and the second channel of the heat exchange device is connected to the heat exchange pipeline.

[0007] Optionally, the temperature control device further comprises a drying and filtering device, a throttling device and a reversing assembly connected in series in pairs; the reversing assembly comprises a first reversing structure and a second reversing structure connected in parallel, the first reversing structure comprises a first one-way valve and a second one-way valve connected in series in sequence, the second reversing structure comprises a third one-way valve and a fourth one-way valve connected in series in sequence, and the positive directions of the first one-way valve, the second one-way valve, the third one-way valve and the fourth one-way valve are directed toward the drying and filtering device;

[0008] The condensing device is communicated with the reversing assembly between the first one-way valve and the second one-way valve, and the first channel is communicated with the reversing assembly between the third one-way valve and the fourth one-way valve.

[0009] Optionally, the temperature control device further includes a liquid storage device, and the first channel is connected to the reversing assembly through the liquid storage device.

[0010] Optionally, a second temperature sensing device is provided near the second end of the coolant circulation pipeline, and the second temperature sensing device is used to detect the temperature of the coolant flowing to the liquid cooling plate.

[0011] Optionally, a third temperature sensing device is provided at the air inlet of the air-cooling heat dissipation device, and the third temperature sensing device is used to detect the ambient temperature at the air inlet.

[0012] On the other hand, the present application provides a battery liquid cooling process based on any of the above battery liquid cooling systems, comprising:

[0013] Step 1): attaching the target battery to the liquid cooling plate;

[0014] Step 2): Turn on the water pump so that the coolant in the liquid cooling plate flows out from the first end and flows into the coolant circulation pipeline;

[0015] Step 3): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate;

[0016] Step 4): when the temperature of the coolant flowing into the liquid cooling plate is lower than the target liquid supply temperature, the first reversing valve is controlled to connect the coolant circulation pipeline with the electric heating device, so that the coolant in the coolant circulation pipeline is divided into two paths, one path of the coolant flows through the electric heating device, and the other path of the coolant flows through the second channel of the heat exchange device through the heat exchange pipeline;

[0017] Step 5): controlling the electric heating device to be in a non-working state so that the temperature of the coolant flowing through the electric heating device remains unchanged;

[0018] Step 6): Control the second reversing valve to connect the outlet of the refrigerant compression device with the first channel of the heat exchange device, and connect the inlet of the refrigerant compression device with the condensing device;

[0019] Step 7): Controlling the operation of the refrigerant compression device so that the refrigerant flows out of the refrigerant compression device, flows through the first channel of the heat exchange device and the condensing device in sequence, exchanges heat with the coolant flowing through the second channel of the heat exchange device in the first channel, and returns to the refrigerant compression device;

[0020] Step 8): The water pump merges the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate from the second end, so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate.

[0021] Optionally, after step 8), the following steps are also included:

[0022] Step 9): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate;

[0023] Step 10): when the temperature of the coolant flowing into the liquid cooling plate is lower than the target liquid supply temperature, if the current speed of the refrigerant compression device is within the speed limit range of the refrigerant compression device, the current speed of the refrigerant compression device is increased, and the temperature of the coolant flowing into the liquid cooling plate is re-acquired until the current speed of the refrigerant compression device reaches the critical value of the speed limit range of the refrigerant compression device, and then the current speed of the refrigerant compression device is stopped from being increased;

[0024] Step 11): Control the electric heating device to enter a working state so that the cooling liquid flowing through the electric heating device is heated up under the action of the electric heating device.

[0025] Optionally, after step 3), the following steps are also included:

[0026] Step 12): when the temperature of the coolant flowing into the liquid cooling plate is higher than the target liquid supply temperature, obtaining the ambient temperature at the air inlet of the air cooling heat dissipation device;

[0027] Step 13): when the ambient temperature is less than or equal to a preset temperature threshold, control the first reversing valve to connect the coolant circulation pipeline with the air-cooled heat dissipation device, so that the coolant in the coolant circulation pipeline is divided into two paths, one path of coolant flows through the air-cooled heat dissipation device, and the other path of coolant flows through the second channel of the heat exchange device through the heat exchange pipeline;

[0028] Step 14): controlling the air-cooling heat dissipation device to operate so that the coolant flowing through the air-cooling heat dissipation device is cooled down under the action of the air-cooling heat dissipation device;

[0029] Step 15): controlling the refrigerant compression device to be in a non-operating state so that the temperature of the coolant flowing through the second channel of the heat exchange device remains unchanged;

[0030] Step 16): The water pump merges the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate from the second end, so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate.

[0031] Optionally, after step 16), the following steps are also included:

[0032] Step 17): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate;

[0033] Step 18): when the temperature of the coolant flowing into the liquid cooling plate is higher than the target liquid supply temperature, if the current rotation speed of the air-cooling heat dissipation device is within the rotation speed limit range of the air-cooling heat dissipation device, the current rotation speed of the air-cooling heat dissipation device is increased, and the temperature of the coolant flowing into the liquid cooling plate is obtained again, until the current rotation speed of the air-cooling heat dissipation device reaches the critical value of the rotation speed limit range of the air-cooling heat dissipation device, and then the current rotation speed of the air-cooling heat dissipation device is stopped from being increased;

[0034] Step 19): Control the second reversing valve to connect the outlet of the refrigerant compression device with the condensing device, and connect the inlet of the refrigerant compression device with the first channel of the heat exchange device;

[0035] Step 20): Control the operation of the refrigerant compression device so that the refrigerant flows out of the refrigerant compression device, flows through the condensing device and the first channel of the heat exchange device in sequence, exchanges heat with the coolant flowing through the second channel of the heat exchange device in the first channel, and returns to the refrigerant compression device.

[0036] Optionally, after step 12), the following steps are also included:

[0037] Step 21): when the ambient temperature is greater than the preset temperature threshold, controlling the first reversing valve to connect the coolant circulation pipeline with the electric heating device, so that the coolant in the coolant circulation pipeline is divided into two paths, one path of coolant flows through the electric heating device, and the other path of coolant flows through the second channel of the heat exchange device through the heat exchange pipeline;

[0038] Step 22): controlling the electric heating device to be in a non-operating state so that the temperature of the coolant flowing through the electric heating device remains unchanged;

[0039] Step 23): Control the second reversing valve to connect the outlet of the refrigerant compression device with the condensing device, and connect the inlet of the refrigerant compression device with the first channel of the heat exchange device;

[0040] Step 24): Control the operation of the refrigerant compression device so that the refrigerant flows out of the refrigerant compression device, flows through the condensing device and the first channel of the heat exchange device in sequence, exchanges heat with the coolant flowing through the second channel of the heat exchange device in the first channel, and returns to the refrigerant compression device;

[0041] Step 25): The water pump merges the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate from the second end, so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate.

[0042] By adopting the above technical solution, the present application has the following beneficial effects:

[0043] The present application provides a battery liquid cooling system, in which an air-cooling heat dissipation device is added to the coolant circulation device, and the coolant can be cooled by forced convection of natural wind by a fan. The temperature of the coolant can be reduced by only the power input of the heat dissipation fan, thereby reducing the energy consumption of the temperature control device in the cooling mode. Especially when the ambient temperature is suitable, the dependence on the refrigeration unit can be significantly reduced, thereby reducing the energy consumption of the entire system. By adding a second reversing valve to the temperature control device, the flow direction of the refrigerant flowing out of the refrigerant compression device is switched, so that the cooling mode and the heating mode can be flexibly switched according to actual needs, reducing the need for the use of electric heating equipment. When the coolant needs to be heated, the heat energy of the refrigerant in the heating mode is used to directly heat the coolant, which significantly improves the energy efficiency ratio. Not only can the energy consumption of the battery liquid cooling system in the cooling mode be reduced, but also the frequency of use of the electric heating device can be reduced, thereby improving the comprehensive energy efficiency of the system and improving the overall performance and reliability of the system.

[0044] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, wherein the same reference numerals generally represent the same components. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 is a schematic structural diagram of a conventional battery liquid cooling system provided in an embodiment of the present application;

[0047] Figure 2 It is a structural schematic diagram of a battery liquid cooling system provided in an embodiment of the present application.

[0048] The following is a supplementary description of the attached drawings:

[0049] 1. Liquid cooling plate; 2. First end; 3. Second end; 4. Water pump; 5. Electric heating device; 6. Air cooling device; 7. Heat exchange pipeline; 8. First reversing valve; 9. Refrigerant compression device; 10. Condensation device; 11. Heat exchange device; 12. Second reversing valve; 13. First channel; 14. Second channel; 15. Drying and filtering device; 16. Throttling device; 17. First one-way valve; 18. Second one-way valve; 19. Third one-way valve; 20. Fourth one-way valve; 21. Liquid storage device; 22. First temperature sensing device; 23. Second temperature sensing device; 24. Third temperature sensing device. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0052] refer to Figure 2 , the present application provides a battery liquid cooling system, comprising:

[0053] The coolant circulation device comprises a liquid cooling plate 1 and a coolant circulation pipeline, wherein the coolant in the liquid cooling plate 1 is used for heat exchange with a target battery; one end of the coolant circulation pipeline is connected to the liquid cooling plate 1 at a first end 2 of the liquid cooling plate 1, and the other end of the coolant circulation pipeline is connected to the liquid cooling plate 1 at a second end 3 of the liquid cooling plate 1; a water pump 4 is arranged near the first end 2 of the coolant circulation pipeline, and the water pump 4 is used for drawing the coolant in the liquid cooling plate 1 out from the first end 2, and flowing through the coolant circulation pipeline and returning to the liquid cooling plate 1 from the second end 3.

[0054] Specifically, the liquid cooling plate 1 is a device for thermal management, which is usually a thin plate structure made of metal, and contains a series of channels or pipes inside to guide the coolant to flow. In the battery liquid cooling system, the function of the liquid cooling plate 1 is to transfer the heat generated by the battery to the coolant, and then the coolant takes the heat away from the battery area through the coolant circulation pipeline to keep the battery within a suitable operating temperature range. Specifically, the water pump 4 is used to overcome resistance and ensure the smooth flow of the coolant in the system. Under the action of the water pump 4, the coolant circulates in the liquid cooling plate 1 and the coolant circulation pipeline. The flow direction of the coolant in the liquid cooling plate 1 is from the second end 3 to the first end 2. In the coolant circulation pipeline, the flow direction of the coolant is from the first end 2 to the second end 3.

[0055] In specific implementation, the liquid cooling plate 1 is usually installed on the surface of the target battery so that it can directly contact the target battery to more effectively absorb the heat generated by the target battery. The coolant flows inside the liquid cooling plate 1 and takes away the heat of the battery through heat conduction, so that the battery will not be locally overheated, ensuring stable operation and long service life of the battery.

[0056] The material of the liquid cooling plate 1 is usually a metal with good thermal conductivity, such as aluminum or copper, to ensure that heat can be quickly transferred from the battery to the coolant; since the coolant may contain chemical components, the material selection of the liquid cooling plate 1 should take into account its corrosion resistance to ensure stability during long-term use. The channels or pipes on the liquid cooling plate 1 should be designed to be as evenly distributed as possible to ensure that the heat in all parts of the battery can be adequately cooled. The liquid cooling plate 1 must have good sealing properties to prevent coolant leakage, and also to prevent external substances from entering the liquid cooling plate 1 and affecting the performance of the coolant.

[0057] In a specific implementation, the substances that can be used as coolants include, but are not limited to: water, ethylene glycol mixture, deionized water, mineral oil, synthetic coolants, etc.

[0058] The coolant circulation pipeline is provided with parallel electric heating equipment 5, air-cooling and heat dissipation equipment 6, and heat exchange pipeline 7; the coolant circulation pipeline is provided with a first reversing valve 8, and the first reversing valve 8 is used to switch the connection state between the coolant circulation pipeline and the electric heating equipment 5 and the air-cooling and heat dissipation equipment 6. Specifically, the first reversing valve 8 is used to switch the flow path of the coolant, and whether to pass through the electric heating equipment 5 or the air-cooling and heat dissipation equipment 6 is selected according to the needs. In this way, the system can adjust the temperature of the coolant according to the actual situation to ensure that the battery is always at the optimal working temperature. The electric heating equipment 5 is an auxiliary device. Under extremely cold conditions, the battery liquid cooling system may face the risk of too low coolant temperature. At this time, the electric heating equipment 5 can intervene in the work. When the first reversing valve 8 switches to the electric heating equipment 5, the coolant will be heated when flowing through the electric heating equipment 5. The air-cooled heat dissipation device 6 is mainly used to help the coolant dissipate heat when the ambient temperature is suitable. When the first reversing valve 8 switches to the air-cooled heat dissipation device 6, the coolant will flow through the air-cooled heat dissipation device 6, and the surrounding air will be continuously introduced through forced convection by the fan, while the heated hot air will be discharged and the heat will be dissipated into the atmosphere, forming a continuous heat dissipation cycle. The heat exchange pipeline 7 is used to connect other devices or systems and perform heat exchange with them.

[0059] In a specific implementation, the first reversing valve 8 can be set as an electric three-way valve. The electric three-way valve has three interfaces, an input port AB and two output ports A and B. It can be driven by a motor or an electromagnetic coil to switch between the two output ports A and B to determine the flow direction of the coolant. For example, the output port A is connected to the air-cooled heat dissipation device 6, and the output port B is connected to the electric heating device 5. In the battery liquid cooling system, the electric three-way valve can automatically switch the flow path of the coolant according to a preset program or a real-time temperature feedback signal to adapt to different working conditions. For example, when the battery temperature rises, the electric three-way valve can open AB-A and close AB-B to switch to the air-cooled heat dissipation device 6, allowing the coolant to flow through the air-cooled heat dissipation device 6, and dissipate the heat to the atmosphere through forced convection by the fan; when the battery temperature drops, the electric three-way valve can open AB-B and close AB-A to switch to the electric heating device 5, allowing the coolant to flow through the electric heating device 5, and then flow back to the battery after heating the coolant to keep the battery at a suitable working temperature.

[0060] In a specific implementation, the air-cooled heat dissipation device 6 can be equipped with a variable frequency fan, so that the speed of the fan can be intelligently adjusted according to the real-time temperature changes of the battery, thereby accurately controlling the heat dissipation. In the battery liquid cooling system, the role of the variable frequency fan is to dissipate the heat carried by the coolant into the atmosphere by forced convection. When the battery temperature rises, the speed of the variable frequency fan will increase, increase the air volume, and enhance the heat dissipation effect; when the battery temperature drops, the speed of the variable frequency fan will slow down, reduce the air volume, and reduce the heat dissipation effect. The advantages of the variable frequency fan are its energy saving and precision. Compared with a fan with a fixed speed, the variable frequency fan can adjust the air volume according to actual needs to avoid unnecessary energy waste. Moreover, since it can accurately control the heat dissipation, it can better adapt to the working state of the battery and improve the performance and life of the battery.

[0061] The temperature control device includes a refrigerant compression device 9, a condensing device 10, a heat exchange device 11 and a second reversing valve 12; the second reversing valve 12 is respectively connected to the outlet of the refrigerant compression device 9, the inlet of the refrigerant compression device 9, the condensing device 10, and the first channel 13 of the heat exchange device 11, and the second reversing valve 12 is used to switch the connection state between the outlet of the refrigerant compression device 9 and the condensing device 10 and the first channel 13, and to switch the connection state between the inlet of the refrigerant compression device 9 and the condensing device 10 and the first channel 13; the condensing device 10 is connected to the first channel 13, and the second channel 14 of the heat exchange device 11 is connected to the heat exchange pipeline 7.

[0062] Specifically, the refrigerant compression device 9 is used to compress the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure gas to promote the refrigerant circulation. The heat exchange device 11 is a heat exchange interface between the refrigerant and the coolant, where the refrigerant absorbs or releases heat to adjust the temperature of the coolant. The second reversing valve 12 is used to switch the flow path of the refrigerant.

[0063] In the cooling mode, the flow path of the refrigerant is: the outlet of the refrigerant compression device 9 → the condensing device 10 → the heat exchange device 11 → the inlet of the refrigerant compression device 9. The refrigerant compression device 9 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gas. During this process, the temperature and pressure of the refrigerant rise significantly. The high-temperature and high-pressure refrigerant gas enters the condensing device 10, releases heat to the surrounding air, and becomes liquid after cooling. The low-temperature liquid refrigerant enters the heat exchange device 11, absorbs the heat of the coolant flowing through the second channel 14, evaporates into a gaseous state, and returns to the refrigerant compression device 9.

[0064] In the heating mode, the flow path of the refrigerant is: the outlet of the refrigerant compression device 9 → the heat exchange device 11 → the condensing device 10 → the inlet of the refrigerant compression device 9. The refrigerant compression device 9 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gas. The high-temperature and high-pressure refrigerant gas enters the heat exchange device 11, releases heat to the coolant flowing through the second channel 14, and becomes liquid after cooling. The low-temperature liquid refrigerant enters the condensing device 10, absorbs heat from the surrounding air, evaporates into a gaseous state, and returns to the refrigerant compression device 9.

[0065] In a specific implementation, the second reversing valve 12 can be set as a four-way reversing valve, which has four interfaces D, C, E, and S. By changing the position of the internal piston, it can switch between multiple interfaces to determine the flow path of the refrigerant. In the battery liquid cooling system, the four-way reversing valve can automatically switch the flow path of the refrigerant according to a preset program or a real-time temperature feedback signal to adapt to different working conditions.

[0066] Assume that the interface D of the four-way reversing valve is connected to the outlet of the refrigerant compression device 9, the interface C is connected to the condensing device 10, the interface S is connected to the inlet of the refrigerant compression device 9, and the interface E is connected to the first channel 13 of the heat exchange device 11. For example, when the battery temperature is too high, DC and ES are turned on to switch to the cooling mode, the refrigerant flows out from the outlet of the refrigerant compression device 9, passes through the condensing device 10 to release heat, then flows through the first channel 13 of the heat exchange device 11, absorbs the heat generated by the battery, and finally returns to the inlet of the refrigerant compression device 9, forming a refrigeration cycle. When the battery temperature is too low, DE and CS are turned on to switch to the heating mode, the refrigerant flows out from the outlet of the refrigerant compression device 9, flows directly through the first channel 13 of the heat exchange device 11, releases heat, then flows through the condensing device 10, and finally returns to the inlet of the refrigerant compression device 9, forming a heating cycle.

[0067] In a specific implementation, the refrigerant compression device 9 can be set as a variable frequency heat pump compressor with jet enthalpy increase. The jet enthalpy increase technology refers to adding a jet port inside the compressor to inject a portion of high-pressure steam into the compression chamber, increasing the heat content of the refrigerant, thereby improving the heating capacity of the compressor. Especially in low temperature environments, the jet enthalpy increase technology helps to overcome the problem of reduced heating capacity of traditional compressors under low temperature conditions, ensuring that the heat pump system can start and operate normally in low temperature environments. Variable frequency control means that the speed of the compressor can be adjusted according to actual needs, thereby achieving precise control of the refrigerant flow and pressure. In the battery liquid cooling system, variable frequency control can help the system better adapt to the working state of the battery and improve the accuracy and response speed of temperature control. The variable frequency heat pump compressor with jet enthalpy increase can provide stable heating capacity and ensure the normal operation of the battery liquid cooling system even in low temperature environments. The use of this compressor can significantly improve the reliability and performance of the battery liquid cooling system, especially under extreme climatic conditions, so that the compressor maintains a high energy efficiency ratio under different working conditions and reduces energy consumption.

[0068] In a specific implementation, the condensing device 10 can be configured as an air-cooled condenser, which uses air flow to cool the refrigerant. The air-cooled heat dissipation device 6 and the condensing device 10 can share a fan, which can save space and cost. The fan can provide wind power for the air-cooled heat dissipation device 6 and the condensing device 10 at the same time to help the coolant and refrigerant dissipate heat; the fan can also serve only one of the devices, reducing unnecessary energy consumption.

[0069] In a specific implementation, the heat exchange device 11 can be configured as a plate heat exchanger, which is composed of a series of metal thin plates, which are stacked on each other with gaps in between, forming a number of staggered channels, through which the refrigerant and the coolant flow respectively, and perform heat exchange through the plate walls. Among them, the channel through which the refrigerant flows is the first channel 13, and the channel through which the coolant flows is the second channel 14.

[0070] Specifically, in the embodiment of the present application, an air-cooling heat dissipation device 6 is added to the coolant circulation device, and the coolant is cooled by natural wind forced convection by a fan, thereby reducing the energy consumption of the temperature control device in the cooling mode; by adding a second reversing valve 12 to the temperature control device to switch the flow direction of the refrigerant, the temperature control device is switched between the cooling mode and the heating mode, thereby reducing the use of the electric heating device 5 to improve the energy efficiency ratio, thereby improving the comprehensive energy efficiency of the battery liquid cooling system.

[0071] In a possible embodiment, the temperature control device further includes a drying and filtering device 15 and a throttling device 16 connected in series. Specifically, the drying and filtering device 15 is mainly used to remove moisture and impurities in the refrigerant to prevent moisture and impurities from affecting the performance of the refrigerant and the normal operation of the device. The throttling device 16 is usually configured as an expansion valve or a capillary tube, and its function is to generate a pressure difference between the condensing device 10 and the heat exchange device 11, so that the refrigerant flows from the high-pressure area to the low-pressure area, and at the same time limits the flow rate of the refrigerant to meet the load demand of the heat exchange device 11.

[0072] If moisture or impurities enter the throttling device 16, it may cause it to be blocked or damaged. The drying and filtering device 15 can remove these impurities and protect the throttling device 16 from damage; moisture in the refrigerant may freeze under low temperature conditions, especially near the throttling device 16, because the sudden drop in pressure there will cause a sudden drop in temperature. Therefore, placing the drying and filtering device 15 before the throttling device, that is, the refrigerant passes through the drying and filtering device 15 before passing through the throttling device 16, can effectively remove moisture or impurities in the refrigerant, prevent ice blockage, and protect the throttling device 16 from contamination.

[0073] However, when switching the flow direction of the refrigerant, the refrigerant may first pass through the throttling device 16 and then pass through the drying and filtering device 15. Therefore, the temperature control device further includes a reversing assembly, and the drying and filtering device 15, the throttling device 16 and the reversing assembly are connected in series in pairs; the reversing assembly includes a first reversing structure and a second reversing structure connected in parallel, the first reversing structure includes a first check valve 17 and a second check valve 18 connected in series in sequence, and the second reversing structure includes a third check valve 19 and a fourth check valve 20 connected in series in sequence, and the first check valve 17, the second check valve 18, the third check valve 19, and the fourth check valve 20 are directed toward the drying and filtering device 15; the condensing device 10 is connected to the reversing assembly between the first check valve 17 and the second check valve 18, and the first channel 13 is connected to the reversing assembly between the third check valve 19 and the fourth check valve.

[0074] Specifically, the forward direction of the first one-way valve 17, the second one-way valve 18, the third one-way valve 19, and the fourth one-way valve 20 is the conduction direction of the one-way valve. Specifically, when the inlet pressure of the one-way valve is higher than the outlet pressure, the fluid enters through the one-way valve. At this time, the valve core is pushed away from the valve seat, and the fluid passes along the channel of the valve body to achieve the forward flow of the fluid. When the reverse pressure is greater than the inlet pressure, the one-way valve is closed, the valve core is pushed toward the valve seat, blocking the inlet channel and preventing the backflow of the fluid.

[0075] In the cooling mode, DC and ES are turned on, and the flow path of the refrigerant is: refrigerant compression device 9 → DC channel of the second reversing valve 12 → condensing device 10 → first one-way valve 17 → drying and filtering device 15 → throttling device 16 → fourth one-way valve 20 → first channel 13 of the heat exchange device 11 → ES channel of the second reversing valve 12 → refrigerant compression device 9.

[0076] In the heating mode, DE and CS are connected, and the flow path of the refrigerant is: refrigerant compression equipment 9 → DE channel of the second reversing valve 12 → first channel 13 of the heat exchange equipment 11 → third one-way valve 19 → drying and filtering equipment 15 → throttling equipment 16 → second one-way valve 18 → condensing equipment 10 → CS channel of the second reversing valve 12 → refrigerant compression equipment 9.

[0077] Specifically, in the embodiment of the present application, through the provision of four one-way valves, the system's control over the refrigerant flow path is enhanced, ensuring the orderly flow of refrigerant between various devices, while also protecting the devices from the impact of reverse flow of refrigerant, especially preventing moisture or impurities from entering the throttling device 16, avoiding ice blockage caused by freezing of water, and blockage or damage caused by accumulation of impurities, so as to ensure that the temperature control device operates more stably and reliably, extend the service life of the equipment, and improve the overall performance of the system.

[0078] In one possible embodiment, the temperature control device further includes a liquid storage device 21, and the first channel 13 is connected to the reversing assembly through the liquid storage device 21. Specifically, in the heating mode, the heat exchange device 11 is used as a condenser, and a liquid storage device 21 is required to store liquid refrigerant. This is because the internal storage space of the heat exchange device 11 is usually much smaller than that of the condensing device 10, and it cannot accommodate a large amount of liquid refrigerant like the condensing device 10. The function of the liquid storage device 21 is to store liquid refrigerant to keep it balanced in the system. When liquid refrigerant is generated during the condensation process, it will be collected in the liquid storage device 21, waiting to be re-inhaled into the compressor. The design of the liquid storage device 21 should take into account the saturated pressure and temperature of the liquid refrigerant to ensure the safe storage of the liquid refrigerant in the liquid storage device 21. And the liquid storage device 21 is required to have sufficient capacity to store liquid refrigerant, ensure the smooth flow of liquid refrigerant during the condensation process, avoid overflow or shortage of liquid refrigerant, so as to maintain the stable operation of the system.

[0079] Specifically, in the embodiment of the present application, the liquid storage device 21 can buffer the fluctuation of the refrigerant, ensure the stable supply of refrigerant between the condensing device 10 and the heat exchange device 11, improve the performance and stability of the system when the heat exchange device 11 is used as a condenser in the heating mode, and eliminate the need for a large-capacity condenser in the heating mode.

[0080] In one possible implementation, a first temperature sensing device 22 is provided between the liquid cooling plate 1 and the water pump 4. The first temperature sensing device 22 is used to detect the temperature of the coolant flowing out of the liquid cooling plate 1 to indicate the temperature of the battery cell. Specifically, the first temperature sensing device 22 monitors the heat dissipation of the target battery to ensure that the target battery is within a suitable operating temperature range. The target liquid supply temperature can be adjusted with reference to the output data of the first temperature sensing device 22. If the temperature of the coolant flowing out of the liquid cooling plate 1 is too high, it means that the target battery may be overheating. At this time, the system can take corresponding measures, such as lowering the target liquid supply temperature, reducing the load, or adjusting the temperature control strategy to prevent the battery from overheating.

[0081] A second temperature sensing device 23 is provided near the second end 3 of the coolant circulation pipeline, and the second temperature sensing device 23 is used to detect the temperature of the coolant flowing to the liquid cooling plate 1. Specifically, the data of the second temperature sensing device 23 is used to evaluate the temperature control effect of the coolant after passing through the coolant circulation pipeline, and whether the coolant is ready to absorb the heat generated by the battery again.

[0082] Specifically, in the embodiment of the present application, the first temperature sensing device 22 and the second temperature sensing device 23 are provided to monitor the temperature of the coolant, thereby ensuring that the system can effectively control the temperature of the target battery. Through the data of these two temperature sensors, the system can monitor the temperature changes of the coolant in real time and adjust the target supply temperature of the coolant in time to ensure that the target battery is always within the optimal operating temperature range, which helps to improve the performance and life of the battery, and can also prevent potential overheating hazards.

[0083] In one possible implementation, the air inlet of the air-cooling heat dissipation device 6 is provided with a third temperature sensing device 24, and the third temperature sensing device 24 is used to detect the ambient temperature at the air inlet. Specifically, the data of the third temperature sensing device 24 is used for the operation of the air-cooling heat dissipation device 6. Specifically, according to the ambient temperature, the system can automatically adjust the speed of the fan to provide an appropriate air flow rate. When the ambient temperature is low, the fan speed can be appropriately reduced to save energy; conversely, when the ambient temperature is high, the fan speed can be increased to enhance heat dissipation, and the cooling mode of the temperature control device can be turned on in time; when the ambient temperature is too high and is not enough to support the air-cooling heat dissipation device 6 to achieve the heat dissipation effect, only the cooling mode of the temperature control device can be turned on.

[0084] Specifically, in the embodiment of the present application, by setting up a third temperature sensing device 24, information about the ambient temperature is obtained so as to optimize the operation of the air-cooled heat dissipation device 6 according to the ambient temperature, which not only improves the heat dissipation efficiency but also reduces unnecessary energy consumption, thereby helping to extend the life of the equipment.

[0085] On the other hand, a battery liquid cooling process is also provided. The process is implemented based on the battery liquid cooling system provided in any of the above embodiments, and includes the following steps:

[0086] Step 1): Lay the target battery on the liquid cooling plate 1;

[0087] Step 2): Turn on the water pump 4 so that the coolant in the liquid cooling plate 1 flows out from the first end 2 and flows into the coolant circulation pipeline;

[0088] Step 3): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate 1;

[0089] Step 4): When the temperature of the coolant flowing into the liquid cooling plate 1 is lower than the target liquid supply temperature, the first reversing valve 8 is controlled to connect the coolant circulation pipeline with the electric heating device 5, so that the coolant in the coolant circulation pipeline is divided into two paths, one path of the coolant flows through the electric heating device 5, and the other path of the coolant flows through the second channel 14 of the heat exchange device 11 through the heat exchange pipeline 7;

[0090] Step 5): Control the electric heating device 5 to be in a non-working state so that the temperature of the coolant flowing through the electric heating device 5 remains unchanged;

[0091] Step 6): Control the second reversing valve 12 to connect the outlet of the refrigerant compression device 9 with the first channel 13 of the heat exchange device 11, and connect the inlet of the refrigerant compression device 9 with the condensing device 10;

[0092] Step 7): Control the operation of the refrigerant compression device 9 so that the refrigerant flows out of the refrigerant compression device 9, flows through the first channel 13 of the heat exchange device 11 and the condensing device 10 in sequence, exchanges heat with the coolant flowing through the second channel 14 of the heat exchange device 11 in the first channel 13, and returns to the refrigerant compression device 9;

[0093] Step 8): The water pump 4 collects the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate 1 from the second end 3, so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate 1;

[0094] Step 9): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate 1;

[0095] Step 10): when the temperature of the coolant flowing into the liquid cooling plate 1 is lower than the target liquid supply temperature, if the current speed of the refrigerant compression device 9 is within the speed limit range of the refrigerant compression device 9, the current speed of the refrigerant compression device 9 is increased, and the temperature of the coolant flowing into the liquid cooling plate 1 is obtained again, until the current speed of the refrigerant compression device 9 reaches the critical value of the speed limit range of the refrigerant compression device 9, and then the current speed of the refrigerant compression device 9 is stopped from being increased;

[0096] Step 11): Control the electric heating device 5 to enter a working state, so that the cooling liquid flowing through the electric heating device 5 is heated up under the action of the electric heating device 5 .

[0097] In order to explain the process in detail, Figure 2 Take the example to illustrate the battery liquid cooling process of the embodiment of the present application.

[0098] The target battery is tightly fitted to the liquid cooling plate 1 to ensure good heat conduction; the water pump 4 is turned on to allow the coolant to start flowing in the liquid cooling plate 1 and then through the coolant circulation pipeline; the temperature of the coolant flowing into the liquid cooling plate 1 is measured by the second temperature sensing device 23; if the detected coolant temperature is lower than the set target liquid supply temperature, the coolant is heated only by the heating mode of the temperature control device. Specifically, the temperature control device turns on the heating mode, the electric heating device 5 is turned off, and the coolant is divided into two parallel paths, one of which flows through the electric heating device 5 and the temperature remains unchanged, and the other flows through the heat exchange pipeline 7 and the second channel 14 of the heat exchange device 11 and the temperature increases. Specifically, the first reversing valve 8 opens AB-B and closes AB-A, a part of the coolant flows through the electric heating device 5, and the other part flows through the second channel 14 of the heat exchange device 11 through the heat exchange pipeline 7; the electric heating device 5 is controlled not to work, and the temperature of the coolant flowing therethrough is kept unchanged; the second reversing valve 12 conducts DE and CS, so that the outlet of the refrigerant compression device 9 is connected to the first channel 13 of the heat exchange device 11 through the DE channel, and the inlet of the refrigerant compression device 9 is connected to the condensing device 10 through the CS channel; the refrigerant compression device 9 is started, and the refrigerant flows out of the refrigerant compression device 9, passes through the first channel 13 of the heat exchange device 11 and the condensing device 10 in turn, and returns to the refrigerant compression device 9, forming a heating cycle, and the refrigerant exchanges heat with the coolant flowing through the second channel 14 in the first channel 13. The water pump 4 combines the coolant on the two paths and sends them back to the coolant circulation pipeline, and introduces them into the liquid cooling plate 1 from the second end 3 to continue heat exchange.

[0099] The operating frequency of the refrigerant compression device 9 is adjusted by the liquid supply temperature feedback of the second temperature sensing device 23, and the temperature of the mixed coolant is controlled at the set target liquid supply temperature. If the detected coolant temperature is still lower than the target liquid supply temperature, and the current speed of the refrigerant compression device 9 is within its allowable speed range, then the speed of the refrigerant compression device 9 is gradually increased to increase the circulation rate and heat exchange efficiency of the refrigerant. This process will continue until the speed of the refrigerant compression device 9 approaches its maximum allowable value (the critical value of the speed limit range) to ensure that the safety limit of the device is not exceeded. Once the speed of the refrigerant compression device 9 reaches the critical value of its speed limit range, and the coolant has not yet reached the target liquid supply temperature, the electric heating device 5 is activated. The coolant flowing through the electric heating device 5 will be heated up under the action of the electric heating device 5 to make up for the remaining temperature difference.

[0100] Specifically, in the embodiment of the present application, when the temperature of the coolant is lower than the target liquid supply temperature, the electric heating device 5 is not turned on first, and priority is given to trying to heat the coolant only through the heating mode of the temperature control device. When the heating mode of the temperature control device is not sufficient to make the temperature of the coolant reach the target liquid supply temperature, the electric heating device 5 is turned on to make up for the remaining temperature difference. Avoiding frequent use of the electric heating device 5 can greatly reduce power consumption, thereby improving the energy efficiency ratio of the battery liquid cooling system.

[0101] In a possible implementation, after step 3), the following steps are further included:

[0102] Step 12): when the temperature of the coolant flowing into the liquid cooling plate 1 is higher than the target liquid supply temperature, obtaining the ambient temperature at the air inlet of the air cooling device 6;

[0103] Step 13): When the ambient temperature is less than or equal to the preset temperature threshold, the first reversing valve 8 is controlled to connect the coolant circulation pipeline with the air-cooled heat dissipation device 6, so that the coolant in the coolant circulation pipeline is divided into two paths, one path of coolant flows through the air-cooled heat dissipation device 6, and the other path of coolant flows through the second channel 14 of the heat exchange device 11 through the heat exchange pipeline 7;

[0104] Step 14): Control the air-cooling heat dissipation device 6 to operate so that the coolant flowing through the air-cooling heat dissipation device 6 is cooled down by the air-cooling heat dissipation device 6;

[0105] Step 15): Control the refrigerant compression device 9 to be in a non-operating state so that the cooling liquid flowing through the second channel 14 of the heat exchange device 11 maintains a constant temperature;

[0106] Step 16): The water pump 4 merges the two cooling liquids into the cooling liquid circulation pipeline and introduces them into the liquid cooling plate 1 from the second end 3, so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate 1.

[0107] Step 17): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate 1;

[0108] Step 18): when the temperature of the coolant flowing into the liquid cooling plate 1 is higher than the target liquid supply temperature, if the current speed of the air-cooling heat dissipation device 6 is within the speed limit range of the air-cooling heat dissipation device 6, the current speed of the air-cooling heat dissipation device 6 is increased, and the temperature of the coolant flowing into the liquid cooling plate 1 is obtained again, until the current speed of the air-cooling heat dissipation device 6 reaches the critical value of the speed limit range of the air-cooling heat dissipation device 6, and then the current speed of the air-cooling heat dissipation device 6 is stopped from being increased;

[0109] Step 19): Control the second reversing valve 12 to connect the outlet of the refrigerant compression device 9 with the condensing device 10, and connect the inlet of the refrigerant compression device 9 with the first channel 13 of the heat exchange device 11;

[0110] Step 20): Control the operation of the refrigerant compression device 9 so that the refrigerant flows out of the refrigerant compression device 9, flows through the condensing device 10 and the first channel 13 of the heat exchange device 11 in sequence, exchanges heat with the coolant flowing through the second channel 14 of the heat exchange device 11 in the first channel 13, and returns to the refrigerant compression device 9.

[0111] In order to explain the process in detail, Figure 2 Take the example to illustrate the battery liquid cooling process of the embodiment of the present application.

[0112] When the temperature of the coolant flowing into the liquid cooling plate 1 is higher than the target liquid supply temperature, the ambient temperature at the air inlet of the air-cooling heat dissipation device 6 is obtained through the third temperature sensing device 24. If the ambient temperature is lower than or equal to the preset temperature threshold, the coolant is cooled only by the air-cooling heat dissipation device 6. Specifically, the temperature control device is turned off, and only the air-cooling heat dissipation device 6 is turned on. The coolant is divided into two parallel paths, one of which is cooled after passing through the air-cooling heat dissipation device 6, and the other is kept at the same temperature after passing through the heat exchange pipeline 7. Specifically, the first reversing valve 8 opens AB-A and closes AB-B, a part of the coolant flows through the air-cooling heat dissipation device 6, and the other part flows through the second channel 14 of the heat exchange device 11 through the heat exchange pipeline 7; at this time, the air-cooling heat dissipation device 6 starts to work, and the coolant flowing through it will be cooled down by the air cooling effect; during the operation of the air-cooling heat dissipation device 6, the refrigerant compression device 9 temporarily stops working to keep the temperature of the coolant flowing through the second channel 14 of the heat exchange device 11 unchanged. The coolants on the two paths are combined by the water pump 4 and sent back to the coolant circulation pipeline, and introduced into the liquid cooling plate 1 from the second end 3 to continue the heat exchange.

[0113] The operating frequency of the air-cooled heat dissipation device 6 is adjusted by feedback of the liquid supply temperature of the second temperature sensing device 23, and the temperature of the mixed coolant is controlled at the set target liquid supply temperature. If the coolant temperature is still higher than the target liquid supply temperature, and the current speed of the air-cooled heat dissipation device 6 is within its allowable speed range, then the speed of the air-cooled heat dissipation device 6 is gradually increased to improve the cooling efficiency. This process will continue until the speed of the air-cooled heat dissipation device 6 approaches its maximum allowable value (the critical value of the speed limit range) to ensure that the safety limit of the device is not exceeded. Once the speed of the air-cooled heat dissipation device 6 reaches the critical value of its speed limit range, the temperature control device turns on the heating mode. Specifically, the second reversing valve 12 conducts DC and ES, so that the outlet of the refrigerant compression device 9 is connected to the condensing device 10 through the DC channel, and the inlet of the refrigerant compression device 9 is connected to the first channel 13 of the heat exchange device 11 through the ES channel; the refrigerant compression device 9 is started, and the refrigerant flows out of the refrigerant compression device 9, passes through the condensing device 10 and the first channel 13 of the heat exchange device 11 in sequence, and returns to the refrigerant compression device 9, forming a refrigeration cycle, and the refrigerant exchanges heat with the coolant flowing through the second channel 14 in the first channel 13, so that the coolant flowing through the heat exchange pipeline 7 is heated to make up for the remaining temperature difference.

[0114] The preset temperature threshold is used to determine whether the ambient temperature can support the air-cooling heat dissipation device 6 to effectively help the coolant cool down. Specifically, assuming that the preset temperature threshold is 25°C, this means that when the ambient temperature at the air inlet of the air-cooling heat dissipation device 6 is lower than or equal to 25°C, it is considered that the air-cooling heat dissipation device 6 can effectively help the coolant cool down. In this case, the air-cooling heat dissipation device 6 is enabled because it can use the low temperature of the natural environment to help cool the coolant, which is usually more energy-efficient than using the refrigerant compression device 9 driven by electrical energy.

[0115] Specifically, in the embodiment of the present application, when the temperature of the coolant is higher than the target liquid supply temperature, if the ambient temperature is suitable, the refrigeration mode of the temperature control device is not turned on first, and priority is given to trying to cool the coolant only through the air-cooling heat dissipation device 6. When the air-cooling heat dissipation device 6 is not sufficient to make the temperature of the coolant reach the target liquid supply temperature, the refrigeration mode of the temperature control device is turned on to make up for the remaining temperature difference, thereby reducing the energy consumption of the temperature control device in the refrigeration mode. In particular, when the ambient temperature is suitable, it can significantly reduce the dependence on the refrigeration unit, thereby reducing the energy consumption of the entire system, so as to improve the energy efficiency ratio of the battery liquid cooling system.

[0116] In a possible implementation, after step 12), the following steps are further included:

[0117] Step 21): When the ambient temperature is greater than a preset temperature threshold, the first reversing valve 8 is controlled to connect the coolant circulation pipeline with the electric heating device 5, so that the coolant in the coolant circulation pipeline is divided into two paths, one path of coolant flows through the electric heating device 5, and the other path of coolant flows through the second channel 14 of the heat exchange device 11 through the heat exchange pipeline 7;

[0118] Step 22): Control the electric heating device 5 to be in a non-working state so that the temperature of the coolant flowing through the electric heating device 5 remains unchanged;

[0119] Step 23): Control the second reversing valve 12 to connect the outlet of the refrigerant compression device 9 with the condensing device 10, and connect the inlet of the refrigerant compression device 9 with the first channel 13 of the heat exchange device 11;

[0120] Step 24): Control the operation of the refrigerant compression device 9 so that the refrigerant flows out of the refrigerant compression device 9, flows through the condensing device 10 and the first channel 13 of the heat exchange device 11 in sequence, exchanges heat with the coolant flowing through the second channel 14 of the heat exchange device 11 in the first channel 13, and returns to the refrigerant compression device 9;

[0121] Step 25): The water pump 4 merges the two cooling liquids into the cooling liquid circulation pipeline and introduces them into the liquid cooling plate 1 from the second end 3, so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate 1.

[0122] In order to explain the process in detail, Figure 2 Take the example to illustrate the battery liquid cooling process of the embodiment of the present application.

[0123] If the ambient temperature is higher than the preset temperature threshold, the cooling liquid is cooled only by the cooling mode of the temperature control device. Specifically, the electric heating device 5 and the air cooling device 6 are turned off, and the temperature control device turns on the cooling mode. The cooling liquid is divided into two parallel paths. One path passes through the electric heating device 5 and the temperature remains unchanged. The other path passes through the heat exchange pipe 7 and flows through the second channel 14 of the heat exchange device 11 and the temperature is reduced. Specifically, the first reversing valve 8 opens AB-B and closes AB-A, a part of the coolant flows through the electric heating device 5, and the other part flows through the second channel 14 of the heat exchange device 11 through the heat exchange pipeline 7; the electric heating device 5 is controlled not to work, and the temperature of the coolant flowing therethrough is kept unchanged; the second reversing valve 12 conducts DC and ES, so that the outlet of the refrigerant compression device 9 is connected to the condensing device 10 through the DC channel, and the inlet of the refrigerant compression device 9 is connected to the first channel 13 of the heat exchange device 11 through the ES channel; the refrigerant compression device 9 is started, and the refrigerant flows out of the refrigerant compression device 9, passes through the condensing device 10 and the first channel 13 of the heat exchange device 11 in sequence, and returns to the refrigerant compression device 9, forming a refrigeration cycle, and the refrigerant exchanges heat with the coolant flowing through the second channel 14 in the first channel 13. The water pump 4 combines the coolant on these two paths and sends them back to the coolant circulation pipeline, and introduces them into the liquid cooling plate 1 from the second end 3 to continue heat exchange.

[0124] Specifically, in the embodiment of the present application, when the ambient temperature is higher than the preset temperature threshold and is not sufficient to support the air-cooled heat dissipation device 6 to effectively help cool the coolant, the coolant is cooled only by the refrigeration mode of the temperature control device, which can more effectively reduce the coolant temperature and avoid unnecessary waste of electricity, thereby improving the energy efficiency of the system; automatically adjusting the cooling strategy according to the ambient temperature so that the system is always in the optimal working state, thereby improving the stability and reliability of the system; avoiding frequent startup and shutdown of the air-cooled heat dissipation device 6, reducing the mechanical wear of the equipment and extending the service life of the equipment.

[0125] In summary, the battery liquid cooling system of the present application adds an air-cooling heat dissipation device to the coolant circulation device, and can use the fan to force convection natural wind to cool the coolant. Only the power input of the heat dissipation fan is needed to reduce the temperature of the coolant, thereby reducing the energy consumption of the temperature control device in the cooling mode. Especially when the ambient temperature is suitable, it can significantly reduce the dependence on the refrigeration unit, thereby reducing the energy consumption of the entire system. By adding a second reversing valve to the temperature control device, the flow direction of the refrigerant flowing out of the refrigerant compression device is switched, so that it can be flexibly switched between the cooling mode and the heating mode according to actual needs, reducing the need to use electric heating equipment. When the coolant needs to be heated, the heat energy of the refrigerant in the heating mode is used to directly heat the coolant, which significantly improves the energy efficiency ratio. It can not only reduce the energy consumption of the battery liquid cooling system in the cooling mode, but also reduce the frequency of use of the electric heating equipment, thereby improving the comprehensive energy efficiency of the system and improving the overall performance and reliability of the system.

[0126] In this application, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0127] It should be noted that the order of the above embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. The above description describes specific embodiments, and other embodiments are also within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in the order of different embodiments and can achieve the expected results. In addition, the processes depicted in the drawings do not necessarily require a specific order or connection order to achieve the desired results. In some embodiments, multi-task parallel processing is also possible or may be advantageous.

[0128] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0129] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery liquid cooling system, characterized in that: include: A coolant circulation device, comprising a liquid cooling plate (1) and a coolant circulation pipeline, wherein the coolant in the liquid cooling plate (1) is used for heat exchange with a target battery; One end of the cooling liquid circulation pipeline is connected to the cooling plate (1) at the first end (2) of the cooling plate (1), and the other end of the cooling liquid circulation pipeline is connected to the cooling plate (1) at the second end (3) of the cooling plate (1); a water pump (4) is arranged on the cooling liquid circulation pipeline near the first end (2), and the water pump (4) is used to draw the cooling liquid in the cooling plate (1) out from the first end (2), and flow through the cooling liquid circulation pipeline from the second end (3) back to the cooling plate (1); the cooling liquid circulation pipeline is provided with an electric heating device (5), an air-cooling heat dissipation device (6), and a heat exchange pipeline (7) connected in parallel; the cooling liquid circulation pipeline is provided with a first reversing valve (8), and the first reversing valve (8) is used to switch the connection state between the cooling liquid circulation pipeline and the electric heating device (5) and the air-cooling heat dissipation device (6); A temperature control device comprises a refrigerant compression device (9), a condensing device (10), a heat exchange device (11) and a second reversing valve (12); the second reversing valve (12) is respectively connected to the outlet of the refrigerant compression device (9), the inlet of the refrigerant compression device (9), the condensing device (10) and the first channel (13) of the heat exchange device (11); the second reversing valve (12) is used to switch the connection state between the outlet of the refrigerant compression device (9) and the condensing device (10) and the first channel (13), and to switch the connection state between the inlet of the refrigerant compression device (9) and the condensing device (10) and the first channel (13); the condensing device (10) is connected to the first channel (13), and the second channel (14) of the heat exchange device (11) is connected to the heat exchange pipeline (7).

2. The battery liquid cooling system according to claim 1, characterized in that: The temperature control device further comprises a drying and filtering device (15), a throttling device (16) and a reversing assembly connected in series in pairs; the reversing assembly comprises a first reversing structure and a second reversing structure connected in parallel, the first reversing structure comprises a first one-way valve (17) and a second one-way valve (18) connected in series in sequence, the second reversing structure comprises a third one-way valve (19) and a fourth one-way valve (20) connected in series in sequence, the first one-way valve (17), the second one-way valve (18), the third one-way valve (19) and the fourth one-way valve (20) all facing in a positive direction toward the drying and filtering device (15); The condensing device (10) is connected to the reversing assembly between the first one-way valve (17) and the second one-way valve (18), and the first channel (13) is connected to the reversing assembly between the third one-way valve (19) and the fourth one-way valve.

3. The battery liquid cooling system according to claim 2, characterized in that: The temperature control device further comprises a liquid storage device (21), and the first channel (13) is connected to the reversing component through the liquid storage device (21).

4. The battery liquid cooling system according to claim 1, characterized in that: A second temperature sensing device (23) is provided near the second end (3) of the cooling liquid circulation pipeline, and the second temperature sensing device (23) is used to detect the temperature of the cooling liquid flowing to the liquid cooling plate (1).

5. The battery liquid cooling system according to claim 4, characterized in that: The air inlet of the air-cooling heat dissipation device (6) is provided with a third temperature sensing device (24), and the third temperature sensing device (24) is used to detect the ambient temperature at the air inlet.

6. A battery liquid cooling process based on the battery liquid cooling system according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1): attaching the target battery to the liquid cooling plate (1); Step 2): turning on the water pump (4) so ​​that the coolant in the liquid cooling plate (1) flows out from the first end (2) and flows into the coolant circulation pipeline; Step 3): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate (1); Step 4): when the temperature of the coolant flowing into the liquid cooling plate (1) is lower than the target liquid supply temperature, the first reversing valve (8) is controlled to connect the coolant circulation pipeline with the electric heating device (5), so that the coolant in the coolant circulation pipeline is divided into two paths, one path of the coolant flows through the electric heating device (5), and the other path of the coolant flows through the second channel (14) of the heat exchange device (11) through the heat exchange pipeline (7); Step 5): controlling the electric heating device (5) to be in a non-operating state so that the temperature of the cooling liquid flowing through the electric heating device (5) remains unchanged; Step 6): Control the second reversing valve (12) to connect the outlet of the refrigerant compression device (9) with the first channel (13) of the heat exchange device (11), and connect the inlet of the refrigerant compression device (9) with the condensing device (10); Step 7): Controlling the operation of the refrigerant compression device (9) so that the refrigerant flows out of the refrigerant compression device (9), flows through the first channel (13) of the heat exchange device (11), the condensing device (10) in sequence, exchanges heat with the coolant flowing through the second channel (14) of the heat exchange device (11) in the first channel (13), and returns to the refrigerant compression device (9); Step 8): The water pump (4) merges the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate (1) from the second end (3), so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate (1).

7. The battery liquid cooling process according to claim 6, characterized in that: After step 8), the following steps are also included: Step 9): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate (1); Step 10): when the temperature of the coolant flowing into the liquid cooling plate (1) is lower than the target liquid supply temperature, if the current rotation speed of the refrigerant compression device (9) is within the rotation speed limit range of the refrigerant compression device (9), the current rotation speed of the refrigerant compression device (9) is increased, and the temperature of the coolant flowing into the liquid cooling plate (1) is obtained again, until the current rotation speed of the refrigerant compression device (9) reaches the critical value of the rotation speed limit range of the refrigerant compression device (9), and then the current rotation speed of the refrigerant compression device (9) is stopped from being increased; Step 11): Control the electric heating device (5) to enter a working state, so that the cooling liquid flowing through the electric heating device (5) is heated up under the action of the electric heating device (5).

8. The battery liquid cooling process according to claim 6, characterized in that: After step 3), the following steps are also included: Step 12): when the temperature of the coolant flowing into the liquid cooling plate (1) is higher than the target liquid supply temperature, obtaining the ambient temperature at the air inlet of the air cooling heat dissipation device (6); Step 13): when the ambient temperature is less than or equal to a preset temperature threshold, control the first reversing valve (8) to connect the coolant circulation pipeline with the air-cooling heat dissipation device (6), so that the coolant in the coolant circulation pipeline is divided into two paths, one path of coolant flows through the air-cooling heat dissipation device (6), and the other path of coolant flows through the second channel (14) of the heat exchange device (11) through the heat exchange pipeline (7); Step 14): controlling the operation of the air-cooling heat dissipation device (6) so that the cooling liquid flowing through the air-cooling heat dissipation device (6) is cooled down under the action of the air-cooling heat dissipation device (6); Step 15): controlling the refrigerant compression device (9) to be in a non-operating state so that the temperature of the coolant flowing through the second channel (14) of the heat exchange device (11) remains unchanged; Step 16): The water pump (4) merges the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate (1) from the second end (3), so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate (1).

9. The battery liquid cooling process according to claim 8, characterized in that: After step 16), the following steps are also included: Step 17): obtaining the temperature of the cooling liquid flowing into the liquid cooling plate (1); Step 18): when the temperature of the coolant flowing into the liquid cooling plate (1) is higher than the target liquid supply temperature, if the current rotation speed of the air-cooling heat dissipation device (6) is within the rotation speed limit range of the air-cooling heat dissipation device (6), the current rotation speed of the air-cooling heat dissipation device (6) is increased, and the temperature of the coolant flowing into the liquid cooling plate (1) is obtained again until the current rotation speed of the air-cooling heat dissipation device (6) reaches the critical value of the rotation speed limit range of the air-cooling heat dissipation device (6), and then the current rotation speed of the air-cooling heat dissipation device (6) is stopped from being increased; Step 19): Control the second reversing valve (12) to connect the outlet of the refrigerant compression device (9) with the condensing device (10), and connect the inlet of the refrigerant compression device (9) with the first channel (13) of the heat exchange device (11); Step 20): Control the operation of the refrigerant compression device (9) so that the refrigerant flows out of the refrigerant compression device (9), flows through the condensing device (10) and the first channel (13) of the heat exchange device (11) in sequence, exchanges heat with the coolant flowing through the second channel (14) of the heat exchange device (11) in the first channel (13), and returns to the refrigerant compression device (9).

10. The battery liquid cooling process according to claim 8, characterized in that: After step 12), the following steps are also included: Step 21): when the ambient temperature is greater than the preset temperature threshold, controlling the first reversing valve (8) to connect the coolant circulation pipeline with the electric heating device (5), so that the coolant in the coolant circulation pipeline is divided into two paths, one path of coolant flows through the electric heating device (5), and the other path of coolant flows through the second channel (14) of the heat exchange device (11) through the heat exchange pipeline (7); Step 22): controlling the electric heating device (5) to be in a non-operating state so that the temperature of the cooling liquid flowing through the electric heating device (5) remains unchanged; Step 23): Control the second reversing valve (12) to connect the outlet of the refrigerant compression device (9) with the condensing device (10), and connect the inlet of the refrigerant compression device (9) with the first channel (13) of the heat exchange device (11); Step 24): Controlling the operation of the refrigerant compression device (9) so that the refrigerant flows out of the refrigerant compression device (9), flows through the condensing device (10) and the first channel (13) of the heat exchange device (11) in sequence, exchanges heat with the coolant flowing through the second channel (14) of the heat exchange device (11) in the first channel (13), and returns to the refrigerant compression device (9); Step 25): The water pump (4) merges the two cooling liquids into the cooling liquid circulation pipeline, and introduces them into the liquid cooling plate (1) from the second end (3), so that the cooling liquid exchanges heat with the target battery through the liquid cooling plate (1).

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