Compressor temperature control system for electrochemical energy storage heat management

Abstract

The utility model relates to the technical field of heat management systems, in particular to a compressor temperature control system for electrochemical energy storage heat management, which comprises a heat exchanger, a temperature control system and a temperature control system, and the cooling liquid circulation loop is connected with a battery pack cooling element in the battery pack and exchanges heat with the battery pack through cooling liquid in the battery pack cooling element. The characteristics of the cooling liquid in the cooling liquid circulating pipeline are used for controlling the temperature of the compressor, the compressor can be quickly started in a low-temperature environment and can continuously run in a high-temperature environment, the reliability of the compressor and the energy-saving effect of the electrochemical thermal management system are improved, the reliability of the system at the low temperature is particularly guaranteed, and the service life of the system is prolonged. The pipeline modification of the electrochemical thermal management system is small, the combined work of a plurality of modes can be realized, and the purpose of accurate temperature control is realized.

Description

Technical Field

[0001] This utility model relates to the field of thermal management system technology, and more specifically to a compressor temperature control system for electrochemical energy storage thermal management. Background Technology

[0002] Thermal management units for energy storage are an important component of energy storage systems. Their main function is to regulate and control the temperature or temperature difference of the energy storage batteries through a heat exchange system to ensure the safe and efficient operation of the energy storage system. The heat exchange system mainly includes a heat exchange medium, heat exchange elements, a circulation pump, and a control system. Based on the battery pack temperature information fed back by temperature sensors, the control system controls the power of the circulation pump and automatically adjusts parameters such as the flow rate, temperature, and pressure of the heat exchange medium to maintain the battery pack temperature within a preset range.

[0003] When the ambient temperature is extremely low, such as when the compressor surface temperature is below -10°C, the compressor will not start if the system requires cooling. It must be heated to above -10°C before it can start. Conversely, when the ambient temperature is high, the operation of the energy storage thermal management system may cause the compressor to overheat, leading to damage.

[0004] Therefore, in energy storage thermal management systems, compressors have problems and pain points in unstable operation under low and high temperature conditions. Utility Model Content

[0005] To address the technical problems existing in existing compressor temperature control systems, the first aspect of this utility model proposes a compressor temperature control system for electrochemical energy storage thermal management, comprising:

[0006] The heat exchanger is provided with a first heat exchange channel and a second heat exchange channel;

[0007] A coolant circulation loop is provided, which is connected to the battery pack cooling element inside the battery pack, and exchanges heat with the battery pack through the coolant in the battery pack cooling element; the coolant circulation loop includes a circulation pump, a heater, and a first heat exchange channel connected by pipes between the inlet and outlet of the battery pack cooling element.

[0008] A coolant circulation loop includes a compressor and a condenser connected by a pipe between the inlet and outlet of a second heat exchange channel. A cooling fan is provided on one side of the condenser for cooling the condenser.

[0009] The coolant circulation loop includes a first branch pipe and a second branch pipe. A three-way valve a is provided at the water inlet of the first branch pipe and the second branch pipe. The water inlet of the three-way valve a is located at the water outlet of the circulation pump. The three-way valve is used to control the opening and closing of the first branch pipe and the second branch pipe. The second branch pipe is wound around the surface of the compressor.

[0010] Preferably, the heater is disposed between the circulating pump and the three-way valve a.

[0011] Preferably, the first and second ports of the three-way valve a are connected to the second branch pipe, the first and third ports of the three-way valve a are connected to the first branch pipe, and the second branch pipe is wound around the surface of the compressor.

[0012] Preferably, the second branch pipe includes a flexible water hose.

[0013] Preferably, the three-way valve a includes a proportional three-way valve, which can control the proportion of coolant entering the first branch pipe and the second branch pipe.

[0014] Preferably, the coolant circulation loop is further provided with a cooling pipe for the electrical control box, and the water inlet end of the cooling pipe for the electrical control box is provided with a three-way valve b.

[0015] Preferably, an expansion valve and a gas-liquid separator are connected in series in the coolant circulation loop. The expansion valve is located at the water outlet of the condenser, and the gas-liquid separator is located at the water inlet of the compressor.

[0016] Preferably, when the surface temperature of the compressor is lower than or higher than a preset value, the three-way valve a controls the second branch pipe to open.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] This application utilizes the properties of the coolant itself in the coolant circulation pipeline to control the temperature of the compressor, especially enabling rapid start-up in low-temperature environments and continuous operation in high-temperature environments. This improves the reliability of the compressor and the energy-saving effect of the electrochemical thermal management system, particularly ensuring the reliability of the system at low temperatures. It requires minimal modification to the pipeline of the electrochemical thermal management system and can achieve multiple modes working together to achieve precise temperature control. Attached Figure Description

[0019] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of the compressor temperature control system for electrochemical energy storage thermal management shown in this utility model;

[0021] Figure 2 This is a schematic diagram of the operation of the compressor temperature control system for electrochemical energy storage thermal management shown in this utility model under suitable ambient temperature.

[0022] Figure 3 This is a schematic diagram of the operation of the compressor temperature control system for electrochemical energy storage thermal management shown in this utility model under low temperature conditions;

[0023] Figure 4 This is a schematic diagram of the operation of the compressor temperature control system for electrochemical energy storage thermal management shown in this utility model under ultra-low temperature conditions. Detailed Implementation

[0024] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, the first aspect of this utility model proposes a compressor temperature control system for electrochemical energy storage thermal management, including a coolant circulation loop 101, a coolant circulation loop 102, and a heat exchanger 4. The heat exchanger 4 is provided with a first heat exchange channel and a second heat exchange channel. The coolant circulation loop 101 is connected to the battery pack cooling element 1 inside the battery pack, and heat exchange is performed between the coolant in the battery pack cooling element 1 and the battery pack. The coolant circulation loop 101 includes a circulation pump 2, a heater 3, and a first heat exchange channel connected by a pipe between the inlet and outlet of the battery pack cooling element 1. The coolant circulation loop 102 includes a compressor 5 and a condenser 6 connected by a pipe between the inlet and outlet of the second heat exchange channel. A cooling fan 7 is provided on one side of the condenser 6 for cooling the condenser 6.

[0026] Among them, the battery pack cooling element 1 can be a water-cooled pipe, such as a spiral coil, installed around the battery pack.

[0027] The condenser 6 and heat exchanger 4 serve as heat exchange components for the refrigerant and water circulation, the heater 3 serves as the water heating component in heating mode, and the heat exchanger 4 serves as the water cooling component in compressor cooling mode. The heat exchanger 4 and heater 3, acting as heating or cooling components for the water circulation, work individually and in combination to achieve precise temperature control of the water circulation.

[0028] Among them, heat exchanger 4 can be a plate-type water medium evaporator.

[0029] Furthermore, the coolant circulation loop 102 includes a first branch pipe 11 and a second branch pipe 12. A three-way valve a13 is provided at the water inlet of the first branch pipe 11 and the second branch pipe 12. The water inlet of the three-way valve a13 is located at the water outlet of the circulation pump 2. The three-way valve a13 is used to control the opening and closing of the first branch pipe 11 and the second branch pipe 12. The second branch pipe 12 is wound around the surface of the compressor 5.

[0030] It should be understood that compressor 5 cannot work under low and high temperature conditions. For example, when the ambient temperature is below minus 10 degrees Celsius or the surface temperature of compressor 5 is above 70 degrees Celsius, it is not conducive to the start-up and operation of compressor 5. By setting the second branch pipe 12 on the surface of compressor 5, the temperature of compressor 5 can be controlled by the cooling and heating of the coolant. Regardless of the ambient temperature, the temperature of the coolant is always maintained at around 30 degrees Celsius. For example, in a low temperature environment, the circulating cooling water can bring the compressor to the start-up temperature in a short time. When the compressor starts to heat up, the temperature of the circulating cooling water is much lower than the surface temperature of the compressor after the temperature rises, which can achieve rapid cooling and maintain the operating environment of the compressor.

[0031] Optionally, the first and second ports of the three-way valve a13 are connected to the second branch pipe 12, the first and third ports of the three-way valve a13 are connected to the first branch pipe 11, and the second branch pipe 12 is wound around the surface of the compressor 5.

[0032] Thus, by controlling the opening and closing of the first and second ports or the first and third ports of the three-way valve a13, the flow of coolant through the first branch pipe 11 or the second branch pipe 12 can be controlled.

[0033] Preferably, the three-way valve a13 includes a proportional three-way valve, which can control the proportion of coolant entering the first branch pipe 11 and the second branch pipe 12.

[0034] In this way, the surface temperature of compressor 5 can be precisely controlled, and the flow rate of coolant into the second branch pipe 12 can be controlled according to the temperature rise and fall requirements.

[0035] In a preferred embodiment, the second branch pipe 12 can be a flexible water hose. A flexible water hose provides better coverage of the compressor surface, resulting in better heat exchange.

[0036] In other embodiments, the second branch pipe 12 may also be made of aluminum or copper coil.

[0037] In an optional embodiment, an electrical control box cooling pipe 8 is also connected in parallel in the coolant circulation loop 101. A three-way valve b14 is provided at the water inlet of the electrical control box cooling pipe 8. By controlling the flow rate of the cold liquid entering the electrical control box cooling pipe 8, the electrical control box can also be cooled, or the heat of the electrical control box can be used to increase the temperature of the coolant.

[0038] Preferably, an expansion valve 9 and a gas-liquid separator 10 are connected in series in the coolant circulation loop 102. The expansion valve 9 is located at the water outlet of the condenser 6, and the gas-liquid separator 10 is located at the water inlet of the compressor 5. In this way, the coolant after passing through the condenser changes from high temperature and high pressure to medium temperature and high pressure refrigerant liquid. After expanding through the expansion valve 9 and absorbing heat from the water circulation in the heat exchanger 4, it becomes superheated refrigerant gas. After passing through the gas-liquid separator 10, it enters the compressor 5, thus forming a refrigerant cycle.

[0039] Furthermore, when the surface temperature of compressor 5 is lower than or higher than the preset value, the three-way valve a13 controls the second branch pipe 12 to open.

[0040] It should be understood that the electrochemical thermal management system includes various operating environments, such as suitable ambient temperature, low ambient temperature, high ambient temperature, and extremely low ambient temperature.

[0041] Suitable ambient temperature compressor cooling mode: applicable scenarios are when the ambient temperature is high or the compressor surface temperature is greater than -10℃.

[0042] like Figure 2 As shown, on the refrigerant circulation side: the compressor 5 is working, the high-temperature and high-pressure refrigerant gas flows through the condenser 6, and the cooling fan 7 is working to cool the high-temperature and high-pressure refrigerant into a medium-temperature and high-pressure refrigerant liquid. After expanding through the expansion valve and evaporating in the plate water medium evaporator to absorb the heat from the water circulation, it becomes a superheated refrigerant gas. After passing through the gas-liquid separator, it enters the compressor 5, thus forming the refrigerant circulation.

[0043] like Figure 2 As shown, on the water circulation side: higher temperature water flows from the battery pack cooling element 1 through the circulation pump 2, heater 3 (heater off), and then through the first and third ports of the three-way valve a13. After being cooled in the plate water medium evaporator, the water flow rate is proportionally adjusted by the proportional valve. The appropriately cooled water then passes through the electrical control box 8 in operation to cool the electrical control box 8. Finally, after flowing through the battery pack cooling element 1, the water temperature rises and the battery pack temperature drops. It then returns to the plate water medium evaporator for further cooling after passing through the circulation pump 2, heater 3 (heater off), and the first and third ports of the three-way valve a13. This cycle is repeated to achieve the purpose of cooling the battery pack by controlling the water temperature.

[0044] like Figure 3As shown, the low ambient temperature compressor cooling mode is used when the ambient temperature is low or the compressor surface temperature is <-10℃. At this time, the battery pack needs to be cooled, but the water side temperature is much higher than -10℃. The compressor cannot start at this time. The three-way valve a13 is adjusted to connect the first and second interfaces to implement the compressor surface heating strategy. At the same time, the battery pack 2 is temperature-equalized. When the compressor surface temperature is >-10℃, the compressor is started. When the system is stable, the three-way valve a13 is adjusted from connecting the first and second interfaces to connecting the first and third interfaces.

[0045] After the system stabilizes, on the water circulation side: higher temperature water flows from the battery pack cooling element 1 through the circulation pump 2, heater 3 (heater off), and then through the first and third ports of the three-way valve a13. After being cooled in the plate water medium evaporator, the water flow rate is proportionally adjusted by the proportional three-way valve b14. The cooled water at the appropriate flow rate passes through the electrical control box 8 in operation to cool the electrical control box 8. Finally, after flowing through the battery pack cooling element 1, the water temperature rises and the battery pack temperature drops. It then returns to the plate water medium evaporator for cooling again through the circulation pump 2, heater 3 (heater off), the first and third ports of the three-way valve a13, and the cycle continues to achieve the purpose of cooling the battery pack by controlling the water temperature.

[0046] After the system stabilizes, on the refrigerant circulation side: compressor 5 works, high-temperature and high-pressure refrigerant gas flows through condenser 6, and cooling fan 7 works to cool the high-temperature and high-pressure refrigerant into medium-temperature and high-pressure refrigerant liquid. After expanding through the expansion valve and evaporating in the plate water medium evaporator to absorb the heat of the water circulation, it becomes superheated refrigerant gas. After passing through the gas-liquid separator, it enters compressor 5, thus forming the refrigerant cycle.

[0047] High ambient temperature compressor cooling mode: This mode is used when the ambient temperature is high and the compressor temperature is too high.

[0048] like Figure 1 As shown, on the refrigerant circulation side: the compressor 5 is working, the high-temperature and high-pressure refrigerant gas flows through the condenser 6, and the cooling fan 7 is working to cool the high-temperature and high-pressure refrigerant into a medium-temperature and high-pressure refrigerant liquid. After expanding through the expansion valve and evaporating in the plate water medium evaporator to absorb the heat from the water circulation, it becomes a superheated refrigerant gas. After passing through the gas-liquid separator, it enters the compressor 5, thus forming the refrigerant circulation.

[0049] like Figure 1As shown, on the water circulation side: higher temperature water flows from the battery pack cooling element 1 through the circulation pump 2, heater 3 (heater off), and then through the first and second ports and the first and third ports of the three-way valve a13. The water flow rate of the first and second ports and the first and third ports is proportionally adjusted. The water flows through the second branch pipe 12 to cool and control the compressor. After being cooled in the plate water medium evaporator, the cooled water at a suitable flow rate passes through the electrical control box 8 in the working state to cool the electrical control box 8. Finally, after flowing through the battery pack cooling element 1, the water temperature rises and the battery pack temperature drops. It then flows through the circulation pump 2, heater 3 (heater off), and three-way valve a13 back to the plate water medium evaporator for cooling again. The cycle works to achieve the purpose of cooling the battery pack by controlling the water temperature.

[0050] Battery pack self-circulation temperature equalization mode: This is used in scenarios where there are significant internal temperature differences within the battery pack and temperature equalization is required, such as... Figure 4 As shown, only the circulating pump 2 and the three-way valve a13 are working; the other cooling and heating components are not working.

[0051] PTC standalone heating mode: This is used when the ambient temperature is extremely low, the compressor is not suitable for operation, and the battery pack needs to be heated.

[0052] like Figure 4 As shown, based on the battery pack's self-circulating temperature equalization mode, heater 3 heats the water, and the first and second ports of three-way valve a13 are open to heat compressor 5. Simultaneously, the water flowing through the proportional valve into the electrical control box 8 also draws the waste heat from the electrical control box 8 into the system loop, thus cooling the electrical control box 8 and reducing system energy consumption. This achieves the purpose of temperature control for both the water side and the battery pack.

[0053] The heater 3 is positioned between the circulating pump 2 and the three-way valve a13. Thus, the water heated by the heater 3 can preferentially heat the compressor 5, enabling it to start up quickly.

[0054] In conjunction with the above embodiments, this application utilizes the characteristics of the coolant itself in the coolant circulation pipeline to control the temperature of the compressor. In particular, it can start quickly in low-temperature environments and operate continuously in high-temperature environments, improving the reliability of the compressor and the energy-saving effect of the electrochemical thermal management system. It especially ensures the reliability of the system at low temperatures, requires minimal modification to the pipeline of the electrochemical thermal management system, and can achieve multiple modes working together to achieve the purpose of precise temperature control.

[0055] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A compressor temperature control system for electrochemical energy storage thermal management, characterized in that, include: The heat exchanger (4) is provided with a first heat exchange channel and a second heat exchange channel; A coolant circulation loop (101) is connected to the battery pack cooling element (1) inside the battery pack, and heat exchange is performed between the coolant in the battery pack cooling element (1) and the battery pack; the coolant circulation loop (101) includes a circulation pump (2), a heater (3) and a first heat exchange channel connected by a pipe between the inlet and outlet of the battery pack cooling element (1); A coolant circulation loop (102) includes a compressor (5) and a condenser (6) connected by a pipe between the inlet and outlet of the second heat exchange channel. A cooling fan (7) is provided on one side of the condenser (6) for cooling the condenser (6). The coolant circulation loop (101) includes a first branch pipe (11) and a second branch pipe (12). The inlet of the first branch pipe (11) and the second branch pipe (12) is provided with a three-way valve a (13). The inlet end of the three-way valve a (13) is located at the outlet end of the circulation pump (2). The three-way valve a (13) is used to control the opening and closing of the first branch pipe (11) and the second branch pipe (12). The second branch pipe (12) is wound around the surface of the compressor (5).

2. The compressor temperature control system for electrochemical energy storage thermal management according to claim 1, characterized in that, The heater (3) is positioned between the circulating pump (2) and the three-way valve a (13).

3. The compressor temperature control system for electrochemical energy storage thermal management according to claim 1, characterized in that, The first two ports of the three-way valve a (13) are connected to the second branch pipe (12), the first three ports of the three-way valve a (13) are connected to the first branch pipe (11), and the second branch pipe (12) is wound around the surface of the compressor (5).

4. The compressor temperature control system for electrochemical energy storage thermal management according to claim 3, characterized in that, The second branch pipe (12) includes a flexible water hose.

5. The compressor temperature control system for electrochemical energy storage thermal management according to claim 1, characterized in that, The three-way valve a (13) includes a proportional three-way valve, which can control the proportion of coolant entering the first branch pipe (11) and the second branch pipe (12).

6. The compressor temperature control system for electrochemical energy storage thermal management according to claim 1, characterized in that, The coolant circulation loop (101) is also equipped with a cooling pipe (8) for the electrical control box, and the water inlet of the cooling pipe (8) for the electrical control box is equipped with a three-way valve b (14).

7. The compressor temperature control system for electrochemical energy storage thermal management according to claim 1, characterized in that, An expansion valve (9) and a gas-liquid separator (10) are connected in series in the coolant circulation loop (102). The expansion valve (9) is located at the water outlet of the condenser (6), and the gas-liquid separator (10) is located at the water inlet of the compressor (5).

8. The compressor temperature control system for electrochemical energy storage thermal management according to any one of claims 1-7, characterized in that, When the surface temperature of the compressor (5) is lower than or higher than the preset value, the three-way valve a (13) controls the second branch pipe (12) to open.

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