Rotation speed regulation method and apparatus

Abstract

Provided in the embodiments of the present application are a rotation speed regulation method and apparatus, which can reduce the power consumption of a thermal management system and improve the reliability of the thermal management system. The method is applied to an energy storage system, the energy storage system comprising a thermal management system, wherein the thermal management system is used for regulating the temperature of an energy storage device. The method comprises: acquiring an ambient temperature; on the basis of the ambient temperature, determining an operating mode of a thermal management system, wherein the operating mode includes a natural cooling mode and / or a refrigeration-based cooling mode; and on the basis of the operating mode, regulating the operating rotation speed of a fan in the thermal management system.

Description

Methods and devices for speed regulation Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202411497615.X, filed on October 25, 2024, entitled “Method and apparatus for speed regulation”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a method and apparatus for speed regulation. Background Technology

[0003] With the promotion and application of new energy sources, energy storage technology has also developed. Energy storage systems generate a large amount of heat during operation, causing their temperature to rise. When the temperature of the energy storage system rises to a certain level, thermal runaway may occur, producing a large amount of flammable gas, resulting in a high risk of combustion and explosion.

[0004] Energy storage systems include thermal management systems, which regulate the temperature of the energy storage system to maintain it within a normal range. The performance of the thermal management system is a crucial factor in the development of energy storage systems. Summary of the Invention

[0005] This application provides a method and apparatus for speed regulation, which can reduce the power consumption of the thermal management system and improve the reliability of the thermal management system.

[0006] In a first aspect, a method for adjusting the rotational speed is provided, applied to an energy storage system, the energy storage system including a thermal management system for adjusting the temperature of energy storage devices, the method comprising: acquiring an ambient temperature; determining an operating mode of the thermal management system based on the ambient temperature, the operating mode including a natural cooling mode and / or a cooling mode; and adjusting the operating speed of a fan in the thermal management system based on the operating mode.

[0007] In this embodiment, the operating mode of the thermal management system is determined based on the ambient temperature, and the operating speed of the fan in the thermal management system is adjusted based on the determined operating mode. In this way, the fan operating speed can be adapted to the operating mode of the thermal management system to the greatest extent. Since the operating mode of the thermal management system is determined based on the ambient temperature, the determined fan operating speed can match the ambient temperature. On the one hand, this avoids the possibility of a low ambient temperature but a high fan operating speed, which helps reduce the power consumption of the fan and thus the power consumption of the thermal management system. On the other hand, it avoids the possibility of a high ambient temperature but a low fan operating speed, ensuring the cooling capacity of the thermal management system and improving its reliability.

[0008] In some possible implementations, adjusting the operating speed of the fan in the thermal management system according to the operating mode includes: when the operating mode includes the cooling mode, adjusting the operating speed according to the high pressure of the target compression device in the thermal management system.

[0009] When the operating mode includes a cooling mode, the target compressor unit in the thermal management system operates, and the operating speed of the fan is closely related to the high pressure of the target compressor unit. Therefore, the above technical solution can effectively improve the accuracy of fan speed regulation by adjusting the fan operating speed according to the high pressure of the target compressor unit.

[0010] In some possible implementations, when the operating mode is the cooling mode, adjusting the operating speed according to the high pressure of the target compressor in the thermal management system includes: reducing the operating speed when the high pressure is less than a first pressure threshold; keeping the operating speed constant when the high pressure is within the range of the first and second pressure thresholds; and increasing the operating speed when the high pressure is greater than the second pressure threshold; wherein the first pressure threshold is less than the second pressure threshold.

[0011] Because the operating speed of the fan is closely related to the high pressure of the target compression unit in the thermal management system—for example, the higher the high pressure of the target compression unit, the greater the heat the fan needs to dissipate—the above technical solution increases the fan's operating speed when the high pressure is high, decreases the fan's operating speed when the high pressure is low, and maintains a constant operating speed when the high pressure is in the intermediate range. This allows the adjusted operating speed to adapt to the high pressure of the target compression unit, enabling the fan to dissipate heat to the outside in a low-power and reliable manner. Furthermore, increasing the fan's operating speed when the high pressure of the target compression unit is high allows the fan to dissipate heat to the outside in a shorter time, improving the cooling efficiency of the thermal management system. This also ensures that the temperature of the object being cooled (such as an energy storage device) can quickly return to its normal temperature range, guaranteeing the normal operation of the object being cooled by the thermal management system.

[0012] In some possible implementations, adjusting the operating speed based on the high pressure of the target compressor in the thermal management system includes: obtaining the minimum permissible high pressure of the target compressor when the operating mode is the refrigeration mode and the natural cooling mode; and adjusting the operating speed of the fan based on the minimum high pressure and the high pressure of the target compressor.

[0013] In addition to high pressure, the above technical solution also adjusts the fan speed according to the minimum allowable high pressure of the target compression device. On the one hand, adjusting the fan speed according to multiple parameters improves the accuracy of adjusting the operating speed; on the other hand, since the target compression device has requirements for the minimum high pressure during operation, considering the minimum allowable high pressure of the target compression device during the adjustment of the fan speed ensures the reliability of the target compression device to a certain extent.

[0014] In some possible implementations, adjusting the operating speed of the fan based on the minimum high pressure and the high pressure of the target compression device includes: increasing the operating speed when the high pressure of the target compression device is greater than the minimum high pressure; and decreasing the operating speed when the high pressure of the target compression device is less than the minimum high pressure.

[0015] Because the operating speed of the fan is closely related to the high pressure of the target compression unit in the thermal management system—for example, the higher the high pressure of the target compression unit, the greater the heat the fan needs to dissipate—the above technical solution increases the fan's operating speed when the high pressure is higher than the minimum high pressure and decreases the fan's operating speed when the high pressure is lower than the minimum high pressure. This allows the adjusted operating speed to match the high pressure of the target compression unit, enabling the fan to reliably dissipate heat to the outside in a low-power consumption manner.

[0016] In some possible implementations, obtaining the minimum permissible high-pressure pressure of the target compression device includes: determining the minimum high-pressure pressure of the target compression device based on the low-pressure pressure of the target compression device and based on the correspondence between the low-pressure pressure and the minimum permissible high-pressure pressure of the compression device.

[0017] The above technical solution determines the minimum high pressure of the target compression device based on the low pressure of the target compression device and the correspondence between the low pressure and the minimum high pressure of the allowable compression device. This method is not only simple to implement, but also yields a high degree of accuracy in obtaining the minimum high pressure.

[0018] In some possible implementations, adjusting the operating speed of the fan in the thermal management system according to the operating mode includes: when the operating mode is the natural cooling mode, adjusting the operating speed of the fan according to the inlet temperature of the energy storage device.

[0019] In natural cooling mode, the target compressor in the thermal management system does not operate; instead, it operates under natural cooling. The fan speed is related to the inlet temperature of the energy storage device. Therefore, the above technical solution adjusts the fan speed based on the inlet temperature of the energy storage device, which not only improves the efficiency of speed adjustment but also enhances its accuracy.

[0020] In some possible implementations, adjusting the operating speed of the fan based on the inlet temperature of the energy storage device includes: increasing the operating speed when the inlet temperature of the energy storage device is greater than or equal to a temperature threshold; and decreasing the operating speed when the inlet temperature of the energy storage device is less than the temperature threshold.

[0021] In natural cooling mode, the fan's operating speed is closely related to the inlet temperature of the energy storage device. For example, the higher the inlet temperature, the greater the heat the fan needs to expel. Therefore, the above technical solution increases the fan's operating speed when the inlet temperature of the energy storage device is high and decreases it when the inlet temperature is low. This allows the adjusted operating speed to match the high pressure of the target compression device, enabling the fan to reliably dissipate heat to the outside in a low-power manner.

[0022] In some possible implementations, determining the operating mode of the thermal management system based on the ambient temperature includes: determining the operating mode as the cooling mode when the ambient temperature is greater than a first ambient temperature threshold; determining the operating mode as both the cooling mode and the natural cooling mode when the ambient temperature is less than the first ambient temperature threshold but greater than a second ambient temperature threshold; and determining the operating mode as the natural cooling mode when the ambient temperature is less than the second ambient temperature threshold; wherein the first ambient temperature threshold is greater than the second ambient temperature threshold.

[0023] The above technical solution addresses the following scenarios: When the ambient temperature exceeds a first ambient temperature threshold, indicating a high-temperature environment with high cooling requirements, the operating mode is set to cooling mode. This allows the temperature of the object being cooled (such as energy storage equipment) to quickly return to its normal range, ensuring the normal operation of the object. When the ambient temperature falls below a second ambient temperature threshold, indicating a low-temperature environment with lower cooling requirements, the operating mode is set to natural cooling mode. This not only meets the cooling requirements of the object but also effectively reduces the power consumption of the thermal management system. When the ambient temperature is greater than the second threshold but less than the first threshold, indicating a temperature range between high and low, the operating mode is set to a hybrid mode combining cooling and natural cooling. This mode meets the cooling requirements of the object while reducing the power consumption of the thermal management system.

[0024] In some possible implementations, the energy storage system includes an energy storage device, the energy storage device is disposed within the energy storage device, and the thermal management system includes a first thermal management module and a second thermal management module, the first thermal management module is disposed within the energy storage device, and the second thermal management module is connected to the outer wall of the energy storage device.

[0025] In the above technical solution, the first thermal management module is installed inside the energy storage device, and the second thermal management module is connected to the outer wall of the energy storage device, that is, installed outside the energy storage device. This not only does not increase the internal space of the energy storage device occupied by the thermal management system, but also effectively increases the heat exchange capacity provided by the thermal management system.

[0026] Secondly, a speed regulation device is provided for use in an energy storage system, the energy storage system including a thermal management system for regulating the temperature of the energy storage device, comprising: a processing unit for acquiring the ambient temperature; the processing unit is further configured to determine the operating mode of the thermal management system based on the ambient temperature, the operating mode including a natural cooling mode and / or a cooling mode; and an adjustment unit for adjusting the operating speed of the fan in the thermal management system according to the operating mode.

[0027] Thirdly, a speed regulation device is provided, including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call the computer program to execute the methods in the first aspect or its various implementations described above.

[0028] Fourthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its implementations. Attached Figure Description

[0029] Figure 1 shows a schematic diagram of an energy storage device according to an embodiment of this application.

[0030] Figure 2 shows a schematic flowchart of a speed regulation method according to an embodiment of this application.

[0031] Figure 3 shows a schematic block diagram of a thermal management system according to an embodiment of this application.

[0032] Figure 4 shows a schematic diagram of a thermal management system including a PCS natural cooling loop in a cooling mode according to an embodiment of this application.

[0033] Figure 5 shows a schematic diagram of a thermal management system including a PCS natural cooling loop in both refrigeration and natural cooling modes according to an embodiment of this application.

[0034] Figure 6 shows a schematic diagram of a thermal management system including a PCS natural cooling loop in natural cooling mode according to an embodiment of this application.

[0035] Figure 7 shows a schematic diagram of a thermal management system in cooling mode according to an embodiment of this application, excluding the PCS natural cooling loop.

[0036] Figure 8 shows a schematic diagram of a thermal management system excluding the PCS natural cooling loop in both cooling mode and natural cooling mode according to an embodiment of this application.

[0037] Figure 9 shows a schematic diagram of a thermal management system in natural cooling mode according to an embodiment of this application, excluding the PCS natural cooling loop.

[0038] Figure 10 shows a schematic flowchart of another method for speed regulation according to an embodiment of this application.

[0039] Figure 11 shows a schematic diagram of the correspondence between the low pressure and the minimum permissible high pressure of a compression device.

[0040] Figure 12 shows a schematic flowchart of another method for speed regulation according to an embodiment of this application.

[0041] Figure 13 shows a schematic block diagram of a speed regulation device according to an embodiment of this application.

[0042] Figure 14 shows a schematic block diagram of another speed regulation device according to an embodiment of this application. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0045] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] With the promotion and application of new energy sources, energy storage technology has developed accordingly. An energy storage system is a device or system capable of storing energy and releasing it when needed. In the field of new energy, energy storage systems typically refer to devices that can store electrical energy and release it during peak electricity demand periods. Energy storage systems play multiple roles in the power system, including load balancing, frequency regulation, backup power, peak-valley pricing management, and improving grid stability. With the rapid development of renewable energy, the importance of energy storage systems is increasing daily.

[0049] Electrochemical energy storage, represented by lithium-ion batteries, is the most prevalent energy storage technology. An electrochemical energy storage system typically includes multiple energy storage devices, each of which may include one or more batteries. Each battery may include a casing and one or more individual battery cells encapsulated within that casing. Multiple battery cells can be connected in series, parallel, or a combination thereof, where a combination refers to a mix of series and parallel connections. In the embodiments of this application, the battery may also be referred to as a battery pack, battery module, or battery assembly.

[0050] Normally, during battery use, the temperature rises during charging and discharging. If the battery is not cooled down in time, the continuous rise in battery temperature may affect the stable operation of the entire energy storage device. Alternatively, in cold environments, the battery temperature will continuously drop, such as to 5°C. In this case, lithium plating may occur, for example, during battery charging.

[0051] Energy storage devices typically include a thermal management system, which regulates the battery temperature to maintain it within a normal range. The performance of the thermal management system is a crucial factor in the development of energy storage systems.

[0052] In view of this, embodiments of this application provide a method for adjusting fan speed. This method acquires the ambient temperature and determines the operating mode of the thermal management system based on the ambient temperature, then adjusts the operating speed of the fan in the thermal management system based on the determined operating mode. In this way, the fan's operating speed can be adapted to the operating mode of the thermal management system to the greatest extent. Since the operating mode of the thermal management system is determined based on the ambient temperature, the determined fan operating speed can match the ambient temperature. On the one hand, this avoids the possibility of a low ambient temperature but a high fan operating speed, which helps reduce the fan's power consumption and thus the power consumption of the thermal management system. On the other hand, it avoids the possibility of a high ambient temperature but a low fan operating speed, ensuring the cooling capacity of the thermal management system and improving its reliability.

[0053] The technical solutions of this application embodiment can be applied to energy storage systems, which include energy storage devices. These energy storage devices can be of various types and sizes. For example, as shown in FIG1, the energy storage device can be an energy storage container or an energy storage cabinet. The energy storage device can be, for example, a regular cuboid structure, where the six faces of the cuboid are the six outer walls of the energy storage device. Setting the energy storage device as a cuboid structure facilitates its fixed placement and transportation. Of course, the energy storage device can also be of other shapes; for example, at least one wall of the energy storage device may be inclined.

[0054] Alternatively, the technical solutions of this application embodiment can be applied to electrical equipment, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0055] Figure 2 shows a schematic flowchart of a speed regulation method 200 according to an embodiment of this application. Method 200 is applied to an energy storage system, which includes a thermal management system for regulating the temperature of the energy storage device.

[0056] Method 200 may include at least some of the following.

[0057] S210: Obtain ambient temperature.

[0058] S220: Determine the operating mode of the thermal management system based on the ambient temperature. The operating modes include natural cooling mode and / or refrigeration cooling mode.

[0059] S230: Adjusts the operating speed of the fan in the thermal management system according to the operating mode.

[0060] In this embodiment, the operating mode of the thermal management system is determined based on the ambient temperature, and the operating speed of the fan in the thermal management system is adjusted based on the determined operating mode. In this way, the fan operating speed can be adapted to the operating mode of the thermal management system to the greatest extent. Since the operating mode of the thermal management system is determined based on the ambient temperature, the determined fan operating speed can match the ambient temperature. On the one hand, this avoids the possibility of a low ambient temperature but a high fan operating speed, which helps reduce the power consumption of the fan and thus the power consumption of the thermal management system. On the other hand, it avoids the possibility of a high ambient temperature but a low fan operating speed, ensuring the cooling capacity of the thermal management system and improving its reliability.

[0061] Energy storage devices can be, for example, batteries, which may include battery modules or battery packs. Exemplarily, an energy storage device may include multiple batteries, which may include multiple battery clusters connected in parallel. Each battery cluster may include, for example, four batteries, and each battery may include, for example, 104 battery cells connected in series. One battery cluster may correspond to one slave battery management unit (SBMU), and multiple battery clusters may correspond to one master battery management unit (MBMU).

[0062] The thermal management system can be either an integrated thermal management system or a split thermal management system. Compared to an integrated thermal management system, a split thermal management system has a larger heat dissipation airflow duct and a wider range of adjustable airflow.

[0063] Referring again to Figure 1, the split-type thermal management system includes a first thermal management module 11 and a second thermal management module 12. The first thermal management module is located inside the energy storage device 10, while the second thermal management module 12 is located outside the energy storage device 10, for example, externally mounted on the energy storage device 10. Therefore, the split-type thermal management system can also be called an externally mounted thermal management system. In this way, not only is the internal space occupied by the thermal management system in the energy storage device not increased, but the heat exchange capacity provided by the thermal management system is also effectively increased.

[0064] Optionally, the ambient temperature can be acquired in real time.

[0065] Alternatively, the ambient temperature can be acquired periodically. For example, the ambient temperature can be acquired every 5ms or 10ms.

[0066] Alternatively, the ambient temperature can be obtained randomly.

[0067] Alternatively, considering that ambient temperature typically does not change abruptly over a period of time, it may be sufficient to obtain the ambient temperature only once.

[0068] Ambient temperature can be obtained using a temperature sensor. Since the ambient temperature is typically the inlet air temperature of the thermal management system, the temperature sensor can be placed at the air inlet of the thermal management system. This results in a high accuracy rate for the obtained ambient temperature, closely approximating the actual ambient temperature.

[0069] When the ambient temperature is greater than a first ambient temperature threshold, the operating mode can be determined as cooling mode; when the ambient temperature is less than the first ambient temperature threshold but greater than a second ambient temperature threshold, the operating mode can be determined as both cooling mode and natural cooling mode; when the ambient temperature is less than the second ambient temperature threshold, natural cooling mode can be determined. The first ambient temperature threshold is greater than the second ambient temperature threshold.

[0070] When the ambient temperature exceeds the first ambient temperature threshold, it indicates a high-temperature environment with high cooling demand. Therefore, the operating mode is set to cooling mode, allowing the temperature of the objects being cooled by the thermal management system (such as energy storage devices) to quickly return to normal, ensuring the normal operation of the objects being cooled. When the ambient temperature is below the second ambient temperature threshold, it indicates a low-temperature environment with lower cooling demand. Therefore, the operating mode is set to natural cooling mode, which not only meets the cooling needs of the objects being cooled but also effectively reduces the power consumption of the thermal management system. When the ambient temperature is greater than the second ambient temperature threshold but less than the first ambient temperature threshold, it indicates a temperature range between high and low temperatures. Therefore, the operating mode is set to a hybrid mode, combining cooling and natural cooling modes, which meets the cooling needs of the objects being cooled while reducing the power consumption of the thermal management system.

[0071] The first ambient temperature threshold can be between 13 degrees Celsius (°C) and 22°C, for example, the first ambient temperature thresholds are 15°C, 18°C, and 20°C. The second ambient temperature threshold can be between -6°C and 2°C, for example, the second ambient temperature thresholds are -5°C, -2°C, and 0°C.

[0072] Natural cooling utilizes temperature differences or airflow in the natural environment to achieve cooling. Refrigeration cooling uses refrigerants, such as coolant media, as a medium, and achieves heat transfer through the evaporation and condensation of the refrigerant, thereby cooling thermally managed objects such as batteries.

[0073] Figure 3 shows a schematic block diagram of a possible thermal management system according to an embodiment of this application. As shown in Figure 3, the thermal management system includes a compressor, which operates in cooling mode. The thermal management system may also include a natural cooling heat exchanger, which operates in natural cooling mode. In addition, the thermal management system may also include a fan, through which heat generated in both cooling mode and natural cooling mode can be discharged to the outside.

[0074] Figures 4-9 illustrate schematic diagrams of two specific thermal management systems according to embodiments of this application. The thermal management systems in Figures 4-6 include a natural cooling loop for the power conversion system (PCS), while the thermal management systems in Figures 7-9 do not include a PCS natural cooling loop. The PCS module is primarily used to control the conversion and flow of electrical energy in the energy storage system, that is, to convert the direct current (DC) in the energy storage system into alternating current (AC) to meet the needs of the power grid or load. Simultaneously, the PCS module can also convert AC to DC to charge the energy storage devices in the energy storage system.

[0075] The thermal management system shown in Figures 4-6 includes a second water pump 101, a one-way valve 102, a PCS cold plate 103, a natural cooling heat exchanger 104, a fan 105, a compressor 201, a refrigerant heat exchanger 202, a throttling device 203, an economizer 204, a vapor-liquid separator 205, a first water pump 301, a battery cold plate 302, a three-way valve 303, a positive temperature coefficient (PTC) heater 401, a throttling valve 402, an expansion tank 403, refrigerant circuit inner shut-off valves 601 and 603, and refrigerant circuit outer shut-off valves 602 and 604.

[0076] As shown in Figures 4 and 7, in the cooling mode, compressor 201, first water pump 301, second water pump 101, and fan 105 operate. As shown in Figures 5 and 8, in both cooling and natural cooling modes, compressor 201 operates, first water pump 301 operates, second water pump 101 does not operate, and fan 105 operates. As shown in Figures 6 and 9, in the natural cooling mode, compressor 201 does not operate, first water pump 301 operates, second water pump 101 does not operate, and fan 105 operates.

[0077] In this embodiment, the operating speed of the fan is adjusted to be the operating speed of the fan 105.

[0078] It should be noted that the schematic diagrams of the thermal management system shown in Figures 5-9 are merely examples. The thermal management system of this application embodiment can also be other structures, and this application embodiment does not specifically limit them.

[0079] Once the operating mode of the thermal management system is determined, the operating speed of the fans in the thermal management system can be adjusted according to the operating mode.

[0080] In some embodiments, as shown in FIG10, S230 may specifically include: when the operating mode is cooling mode, adjusting the operating speed of the fan according to the high pressure of the target compression device in the thermal management system.

[0081] When the operating mode is cooling mode, the target compressor unit in the thermal management system operates, and the operating speed of the fan is closely related to the high pressure of the target compressor unit. Therefore, the above technical solution can effectively improve the accuracy of fan speed regulation by adjusting the fan operating speed according to the high pressure of the target compressor unit.

[0082] The target compression device may include, for example, the compressor 201 shown in Figures 4-9. The high pressure of the target compression device may also be referred to as the pressure at the discharge port of the target compression device, or the refrigerant high pressure at the discharge port of the target compression device.

[0083] The high pressure of the target compression device can be obtained by a pressure sensor. For example, the pressure sensor can be the pressure sensor 702 shown in Figures 4-9. The pressure detected by the pressure sensor 702 is the high pressure of the target compression device.

[0084] Specifically, when the high pressure is less than the first pressure threshold, the operating speed of the fan can be reduced; when the high pressure is within the range of the first and second pressure thresholds, the operating speed of the fan can be kept constant; when the high pressure is greater than the second pressure threshold, the operating speed can be increased. The first pressure threshold is less than the second pressure threshold.

[0085] Because the operating speed of the fan is closely related to the high pressure of the target compression unit in the thermal management system—for example, the higher the high pressure of the target compression unit, the greater the heat the fan needs to dissipate—the above technical solution increases the fan's operating speed when the high pressure is high, decreases the fan's operating speed when the high pressure is low, and maintains a constant operating speed when the high pressure is in the intermediate range. This allows the adjusted operating speed to adapt to the high pressure of the target compression unit, enabling the fan to dissipate heat to the outside in a low-power and reliable manner. Furthermore, increasing the fan's operating speed when the high pressure of the target compression unit is high allows the fan to dissipate heat to the outside in a shorter time, improving the cooling efficiency of the thermal management system. This also ensures that the temperature of the object being cooled (such as an energy storage device) can quickly return to its normal temperature range, guaranteeing the normal operation of the object being cooled by the thermal management system.

[0086] The first and second pressure thresholds can be determined based on actual conditions. For example, the first and second pressure thresholds can be determined based on the current geographical location of the thermal management system and the parameters of the objects being cooled by the thermal management system, such as volume.

[0087] The first pressure threshold can be, for example, in the range of 2.5 MPa to 3.2 MPa, and the second pressure threshold can be, for example, in the range of 3.3 MPa to 4 MPa. For example, when the high pressure of the target compressor is less than 3 MPa, the operating speed of the blower can be reduced; when the high pressure of the target compressor is greater than or equal to 3 MPa and less than 3.5 MPa, the operating speed of the blower remains unchanged; when the high pressure of the target compressor is greater than or equal to 3.5 MPa, the operating speed of the blower can be increased.

[0088] The specific reduction or increase in the operating speed of the fan can be determined based on the actual situation. For example, it can be determined based on the capacity of the entire thermal management system, such as the fan's heat dissipation capacity. Alternatively, it can be determined based on the operating duration and attribute parameters of the object being cooled.

[0089] In other embodiments, as shown again in FIG10, S230 may specifically include: adjusting the operating speed of the fan according to the high pressure of the target compressor when the operating mode is a cooling mode and a natural cooling mode.

[0090] When the operating mode includes a cooling mode, the target compressor unit in the thermal management system operates, and the operating speed of the fan is closely related to the high pressure of the target compressor unit. Therefore, the above technical solution can effectively improve the accuracy of fan speed regulation by adjusting the fan operating speed according to the high pressure of the target compressor unit.

[0091] To ensure the reliability of the target compression unit, the minimum high-pressure of the target compression unit needs to be considered when adjusting the operating speed of the blower. Therefore, alternatively, the minimum permissible high-pressure of the target compression unit can be obtained first, and then the operating speed of the blower can be adjusted based on the minimum high-pressure and the high-pressure of the target compression unit.

[0092] The minimum allowable high pressure of the target compression device may vary depending on the low pressure of the target compression device. Therefore, the minimum allowable high pressure of the target compression device in this embodiment is the minimum allowable high pressure corresponding to the low pressure of the target compression device.

[0093] In addition to high pressure, the above technical solution also adjusts the fan speed according to the minimum allowable high pressure of the target compression device. On the one hand, adjusting the fan speed according to multiple parameters improves the accuracy of adjusting the operating speed; on the other hand, since the target compression device has requirements for the minimum high pressure during operation, considering the minimum allowable high pressure of the target compression device during the adjustment of the fan speed ensures the reliability of the target compression device to a certain extent.

[0094] As an example, the minimum permissible high pressure of the target compression device can be determined based on the attribute parameters of the target compression device.

[0095] As another example, the minimum high-pressure pressure of the target compression device can be determined based on the historical value of the minimum high-pressure pressure of the target compression device.

[0096] As another example, the minimum high-pressure pressure of the target compression device can be determined based on the low-pressure pressure of the target compression device and the correspondence between the low-pressure pressure and the minimum permissible high-pressure pressure of the compression device. This correspondence can be in the form of a table or a graph.

[0097] The above technical solution determines the minimum high pressure of the target compression device based on the low pressure of the target compression device and the correspondence between the low pressure and the minimum high pressure of the allowable compression device. This method is not only simple to implement, but also yields a high degree of accuracy in obtaining the minimum high pressure.

[0098] For example, the low pressure of the target compression device can be obtained by a pressure sensor. The pressure sensor can be, for example, the pressure sensor 701 in Figures 4-9. The pressure detected by the pressure sensor 701 is the low pressure of the target compression device.

[0099] Figure 11 illustrates the correspondence between a possible low-pressure unit and the minimum permissible high-pressure unit of the compressor. The horizontal axis represents the low-pressure unit of the target compressor, and the vertical axis represents the minimum permissible high-pressure unit; both units are in MPa. As can be seen from Figure 11, when the low-pressure unit of the target compressor is in the range of 0.2 MPa–0.6 MPa, the minimum permissible high-pressure unit is 1 MPa. When the low-pressure unit of the target compressor is in the range of 0.6 MPa–1.4 MPa, the minimum permissible high-pressure unit can satisfy the following formula: Pd = (P1 + 0.1) * 1.5 - 0.1

[0100] Where Pd is the minimum allowable high pressure, P1 is the low pressure, 1.5 is the slope of the straight line in Figure 9 when the low pressure of the target compression device is in the range of 0.2MPa-0.6MPa, and 0.1 is atmospheric pressure in MPa.

[0101] Specifically, when the high pressure of the target compression device is greater than the minimum high pressure, the operating speed of the fan can be increased; when the high pressure of the target compression device is less than the minimum high pressure, the operating speed of the fan can be decreased.

[0102] Because the operating speed of the fan is closely related to the high pressure of the target compression unit in the thermal management system—for example, the higher the high pressure of the target compression unit, the greater the heat the fan needs to dissipate—the above technical solution increases the fan's operating speed when the high pressure is higher than the minimum high pressure and decreases the fan's operating speed when the high pressure is lower than the minimum high pressure. This allows the adjusted operating speed to match the high pressure of the target compression unit, enabling the fan to reliably dissipate heat to the outside in a low-power consumption manner.

[0103] Taking Figure 11 as an example, when the low-pressure of the target compressor is within the range of 0.2MPa-0.6MPa, the minimum permissible high-pressure of the compressor is 1MPa. Therefore, when the low-pressure of the target compressor is within the range of 0.2MPa-0.6MPa, if the high-pressure of the target compressor is greater than 1MPa, the operating speed of the fan can be increased; if the high-pressure of the target compressor is less than 1MPa, the operating speed of the fan can be decreased. When the low-pressure of the target compressor is within the range of 0.6MPa-1.4MPa, the minimum permissible high-pressure of the compressor is Pd. Therefore, when the low-pressure of the target compressor is within the range of 0.6MPa-1.4MPa, if the high-pressure of the target compressor is greater than Pd, the operating speed of the fan can be increased; if the high-pressure of the target compressor is less than Pd, the operating speed of the fan can be decreased.

[0104] Considering that the high pressure of the target compression device may fluctuate within a certain range under actual conditions, pressure fluctuations can be taken into account when comparing the high pressure of the target compression device with the minimum allowable high pressure in order to reduce the impact of pressure fluctuations.

[0105] For example, if the high pressure of the target compressor is greater than (P+ΔP), the operating speed of the fan can be increased; if the high pressure of the target compressor is less than (P+ΔP), the operating speed of the fan can be decreased. Specifically, when the low pressure of the target compressor is in the range of 0.2MPa-0.6MPa, P is 1MPa; when the low pressure of the target compressor is in the range of 0.6MPa-1.4MPa, P is Pd.

[0106] The value of ΔP can be determined based on specific circumstances. For example, ΔP can be in the range of 0.05MPa-0.25MPa.

[0107] The value of ΔP can be the same or different depending on the low pressure of the target compression device. For example, when the low pressure of the target compression device is in the range of 0.2MPa-0.6MPa, ΔP can be 0.2MPa; when the low pressure of the target compression device is in the range of 0.6MPa-1.4MPa, ΔP can be 0.1MPa.

[0108] In some other embodiments, as shown in FIG12, S230 may specifically include: when the operating mode is natural cooling mode, adjusting the operating speed of the fan according to the inlet temperature of the energy storage device.

[0109] When the operating mode is natural cooling, the target compressor in the thermal management system does not operate and operates under natural cooling conditions. The fan speed is related to the inlet temperature of the energy storage device. Therefore, adjusting the fan speed according to the inlet temperature of the energy storage device can not only improve the efficiency of speed adjustment but also improve the accuracy of speed adjustment.

[0110] The inlet temperature of an energy storage device refers to the initial temperature at which the cooling medium enters the device's cooling system. The cooling medium, also known as coolant or cold gas, can be designed to circulate for better temperature regulation. Specific cooling media may include water, a mixture of water and ethylene glycol, or air, among others.

[0111] The inlet temperature of the energy storage device can be obtained through a temperature sensor. For example, the temperature sensor 501 shown in Figures 4-9 can be used. The temperature detected by the temperature sensor 501 is the inlet temperature of the energy storage device. The temperature of the cooling medium can also be referred to as the inlet temperature of the energy storage device.

[0112] Specifically, when the battery inlet temperature is greater than or equal to the temperature threshold, the fan speed can be increased; when the battery inlet temperature is less than the temperature threshold, the fan speed can be decreased.

[0113] In natural cooling mode, the fan's operating speed is closely related to the inlet temperature of the energy storage device. For example, the higher the inlet temperature, the greater the heat the fan needs to expel. Therefore, the above technical solution increases the fan's operating speed when the inlet temperature of the energy storage device is high and decreases it when the inlet temperature is low. This allows the adjusted operating speed to match the high pressure of the target compression device, enabling the fan to reliably dissipate heat to the outside in a low-power manner.

[0114] The temperature threshold can be, for example, the set inlet temperature of the battery. The temperature threshold can be determined specifically according to the actual situation; for example, the temperature threshold can be in the range of 15℃-20℃.

[0115] If the temperature threshold is the set inlet temperature of the battery, the operating speed of the fan can be adjusted according to the temperature threshold and the temperature hysteresis. Specifically, if the inlet temperature of the energy storage device is less than (Ts-ΔT), the operating speed of the fan can be reduced; if the inlet temperature of the energy storage device is greater than (Ts-ΔT) and less than (Ts+ΔT), the operating speed of the fan can remain unchanged; if the inlet temperature of the energy storage device is greater than (Ts+ΔT), the operating speed of the fan can be increased. Here, Ts is the temperature threshold, and ΔT is the temperature hysteresis. For example, the temperature hysteresis can range from 0.1℃ to 1℃.

[0116] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0117] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0118] The speed adjustment method according to the embodiments of this application has been described in detail above. The speed adjustment apparatus according to the embodiments of this application will now be described. It should be understood that the speed adjustment apparatus in the embodiments of this application can execute the speed adjustment method in the embodiments of this application.

[0119] Figure 13 shows a schematic block diagram of a speed regulation device 300 according to an embodiment of this application. The speed regulation device 300 is applied to an energy storage system, which includes a thermal management system for regulating the temperature of the energy storage device. As shown in Figure 13, the speed regulation device 300 includes:

[0120] Processing unit 310 is used to acquire ambient temperature.

[0121] The processing unit 310 is further configured to determine the operating mode of the thermal management system based on the ambient temperature, the operating mode including natural cooling mode and / or refrigeration cooling mode.

[0122] The regulating unit 320 is used to adjust the operating speed of the fan in the thermal management system according to the operating mode.

[0123] Optionally, in this embodiment, the adjustment unit 320 is specifically used to: adjust the operating speed according to the high pressure of the target compression device in the thermal management system when the operating mode includes the cooling mode.

[0124] Optionally, in this embodiment, the regulating unit 320 is specifically used to: reduce the operating speed when the high pressure is less than a first pressure threshold; control the operating speed to remain unchanged when the high pressure is within the range of the first and second pressure thresholds; and increase the operating speed when the high pressure is greater than the second pressure threshold; wherein the first pressure threshold is less than the second pressure threshold.

[0125] Optionally, in this embodiment, the processing unit 310 is specifically used to: obtain the minimum allowable high pressure of the target compression device when the operating mode is the refrigeration mode and the natural cooling mode; the adjusting unit 320 is specifically used to: adjust the operating speed of the fan according to the minimum high pressure and the high pressure of the target compression device.

[0126] Optionally, in this embodiment, the adjustment unit 320 is specifically used to: increase the operating speed when the high pressure of the target compression device is greater than the minimum high pressure; and decrease the operating speed when the high pressure of the target compression device is less than the minimum high pressure.

[0127] Optionally, in this embodiment of the application, the processing unit 310 is specifically used to: determine the minimum high pressure of the target compression device based on the low pressure of the target compression device and based on the correspondence between the low pressure and the minimum high pressure of the allowable compression device.

[0128] Optionally, in this embodiment, the adjustment unit 320 is specifically used to: adjust the operating speed of the fan according to the inlet temperature of the energy storage device when the operating mode is the natural cooling mode.

[0129] Optionally, in this embodiment, the regulating unit 320 is specifically used to: increase the operating speed when the inlet temperature of the energy storage device is greater than or equal to a temperature threshold; and decrease the operating speed when the inlet temperature of the energy storage device is less than the temperature threshold.

[0130] Optionally, in this embodiment of the application, the processing unit 310 is specifically configured to: determine the operating mode as the cooling mode when the ambient temperature is greater than a first ambient temperature threshold; determine the operating mode as both the cooling mode and the natural cooling mode when the ambient temperature is less than the first ambient temperature threshold but greater than a second ambient temperature threshold; and determine the operating mode as the natural cooling mode when the ambient temperature is less than the second ambient temperature threshold; wherein the first ambient temperature threshold is greater than the second ambient temperature threshold.

[0131] Optionally, in this embodiment of the application, the energy storage system includes an energy storage device, the energy storage device is disposed within the energy storage device, and the thermal management system includes a first thermal management module and a second thermal management module, the first thermal management module is disposed within the energy storage device, and the second thermal management module is connected to the outer wall of the energy storage device.

[0132] It should be understood that the speed regulating device 300 can perform the corresponding operations in the speed regulating method 200, which will not be described in detail here for the sake of brevity.

[0133] Figure 14 is a schematic diagram of the hardware structure of a speed regulation device 400 according to an embodiment of this application. The speed regulation device 400 includes a memory 410, a processor 420, a communication interface 430, and a bus 440. The memory 410, the processor 420, and the communication interface 430 are interconnected via the bus 440.

[0134] The memory 410 may be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 410 may store a program, and when the program stored in the memory 410 is executed by the processor 420, the processor 420 and the communication interface 430 are used to execute the various steps of the speed adjustment method of the embodiments of this application.

[0135] The processor 420 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the apparatus of this application embodiment, or to execute the speed adjustment method of this application embodiment.

[0136] The processor 420 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the speed adjustment method in this embodiment can be accomplished through integrated logic circuits in the processor 420 or through software instructions.

[0137] The processor 420 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 410. The processor 420 reads the information in memory 410 and, in conjunction with its hardware, completes the functions required by the units included in the speed adjustment device 400 of the embodiments of this application, or executes the speed adjustment method of the embodiments of this application.

[0138] The communication interface 430 uses a transceiver device, such as, but not limited to, a transceiver, to enable communication between the speed regulation device 400 and other devices or communication networks.

[0139] Bus 440 may include a pathway for transmitting information between various components of the speed regulation device 400 (e.g., memory 410, processor 420, communication interface 430).

[0140] It should be noted that although the speed regulation device 400 described above only shows the memory, processor, and communication interface, those skilled in the art should understand that in specific implementations, the speed regulation device 400 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the speed regulation device 400 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the speed regulation device 400 may only include the devices necessary for implementing the embodiments of this application, and not necessarily all the devices shown in FIG. 14.

[0141] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0142] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0143] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described speed regulation method.

[0144] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for adjusting rotational speed, characterized in that, Applied to an energy storage system, the energy storage system including a thermal management system for regulating the temperature of the energy storage device, the method includes: Obtain the ambient temperature; Based on the ambient temperature, the operating mode of the thermal management system is determined, and the operating mode includes natural cooling mode and / or refrigeration cooling mode; Adjust the operating speed of the fan in the thermal management system according to the operating mode.

2. The method according to claim 1, characterized in that, Adjusting the operating speed of the fan in the thermal management system according to the operating mode includes: When the operating mode includes the cooling mode, the operating speed is adjusted according to the high pressure of the target compression device in the thermal management system.

3. The method according to claim 2, characterized in that, When the operating mode is the cooling mode, adjusting the operating speed according to the high pressure of the target compressor in the thermal management system includes: If the high pressure is less than the first pressure threshold, reduce the operating speed; When the high pressure is within the range of the first pressure threshold and the second pressure threshold, the operating speed is controlled to remain constant; If the high pressure is greater than the second pressure threshold, the operating speed is increased; Wherein, the first pressure threshold is less than the second pressure threshold.

4. The method according to claim 3, characterized in that, The first pressure threshold is in the range of 2.5MPa-3.2MPa, and / or the second pressure threshold is in the range of 3.3MPa-4MPa.

5. The method according to claim 2, characterized in that, Adjusting the operating speed according to the high pressure of the target compression device in the thermal management system includes: When the operating modes are the refrigeration mode and the natural cooling mode, obtain the lowest permissible high pressure of the target compressor. The operating speed of the fan is adjusted according to the minimum high pressure and the high pressure of the target compression device.

6. The method according to claim 5, characterized in that, The step of adjusting the operating speed of the fan based on the minimum high pressure and the high pressure of the target compression device includes: If the high pressure of the target compression device is greater than the minimum high pressure, the operating speed is increased; If the high pressure of the target compression device is lower than the minimum high pressure, the operating speed shall be reduced.

7. The method according to claim 5 or 6, characterized in that, The process of obtaining the minimum permissible high pressure of the target compression device includes: The minimum high pressure of the target compression device is determined based on the low pressure of the target compression device and the correspondence between the low pressure and the minimum high pressure of the allowable compression device.

8. The method according to claim 7, characterized in that, When the low pressure is within the range of 0.6 MPa to 1.4 MPa, the minimum permissible high pressure satisfies the formula: Pd = (P1 + 0.1) * 1.5 - 0.1 Wherein, Pd is the minimum allowable high pressure, P1 is the low pressure, and 0.1 is atmospheric pressure, in MPa.

9. The method according to claim 1, characterized in that, Adjusting the operating speed of the fan in the thermal management system according to the operating mode includes: When the operating mode is the natural cooling mode, the operating speed of the fan is adjusted according to the inlet temperature of the energy storage device.

10. The method according to claim 9, characterized in that, The step of adjusting the operating speed of the fan according to the inlet temperature of the energy storage device includes: When the inlet temperature of the energy storage device is greater than or equal to the temperature threshold, the operating speed is increased. If the inlet temperature of the energy storage device is lower than the temperature threshold, the operating speed shall be reduced.

11. The method according to claim 9, characterized in that, The step of adjusting the operating speed of the fan according to the inlet temperature of the energy storage device includes: If the inlet temperature is greater than or equal to (Ts+ΔT), increase the operating speed; If the inlet temperature is less than (Ts-ΔT), reduce the operating speed; Where Ts is the temperature threshold and ΔT is the temperature hysteresis.

12. The method according to claim 11, characterized in that, The temperature hysteresis ranges from 0.1℃ to 1℃.

13. The method according to any one of claims 1 to 12, characterized in that, Determining the operating mode of the thermal management system based on the ambient temperature includes: When the ambient temperature is greater than the first ambient temperature threshold, the operating mode is determined to be the cooling mode. When the ambient temperature is less than the first ambient temperature threshold and greater than the second ambient temperature threshold, the operating mode is determined to be the cooling mode and the natural cooling mode. When the ambient temperature is lower than the second ambient temperature threshold, the operating mode is determined to be the natural cooling mode; Wherein, the first ambient temperature threshold is greater than the second ambient temperature threshold.

14. The method according to claim 13, characterized in that, The first ambient temperature threshold is between 13℃ and 22℃, and / or the second ambient temperature threshold is between -6℃ and 2℃.

15. The method according to any one of claims 1 to 14, characterized in that, The energy storage system includes an energy storage device, the energy storage equipment is disposed within the energy storage device, and the thermal management system includes a first thermal management module and a second thermal management module, the first thermal management module is disposed within the energy storage device, and the second thermal management module is connected to the outer wall of the energy storage device.

16. A speed regulating device, characterized in that, Applied to an energy storage system, the energy storage system includes a thermal management system for regulating the temperature of the energy storage device, including: The processing unit is used to acquire the ambient temperature; The processing unit is further configured to determine the operating mode of the thermal management system based on the ambient temperature, the operating mode including natural cooling mode and / or refrigeration cooling mode; The regulating unit is used to adjust the operating speed of the fan in the thermal management system according to the operating mode.

17. A speed regulating device, characterized in that, include: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform a speed regulation method according to any one of claims 1 to 15.

18. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the speed regulation method as described in any one of claims 1 to 15.

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