Thermal Management System Control Method for Energy Storage Cabinet and Energy Storage Cabinet

Abstract

The present application relates to a control method for a thermal management system of an energy storage cabinet and an energy storage cabinet, belonging to the technical field of energy storage. The thermal management system includes a thermal management device, a filter screen, and a driving component. The thermal management device includes an air inlet, and the driving component is used to drive the movement of the filter screen. The control method for the thermal management system of the energy storage cabinet at least includes the following steps: When the thermal management device is in an on state, when the current relative concentration P of medium and small particles in the external environment is greater than the relative concentration threshold P of medium and small particles th + return difference a, the driving component is turned on so that the filter screen moves relative to the air inlet to a blocking state. When the current relative concentration P of medium and small particles in the external environment is less than the relative concentration threshold P of medium and small particles th - return difference a, the filter screen is moved relative to the air inlet to a falling-back state, avoiding the risk of increased air resistance caused by the filter screen still being in a blocking state, improving the air flow rate, reducing the risk of derating of the thermal management device, improving the heat exchange efficiency of the thermal management device, and effectively balancing the filtering effect and air resistance at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, in particular to a control method for the thermal management system of an energy storage cabinet and an energy storage cabinet. Background Art

[0002] An energy storage cabinet is usually provided with a thermal management system to maintain the interior of the energy storage cabinet at the optimal operating temperature and improve the operating performance of the battery cabinet. The thermal management system usually includes an air conditioner, which generally includes an indoor unit and an outdoor unit. The function of the indoor unit is to cool and circulate the air inside the energy storage cabinet, and the function of the outdoor unit is to cool the refrigerant in the air conditioner condenser through external air. The outdoor unit includes an air inlet and an air outlet, which are respectively used for the inlet and outlet of air. When the energy storage cabinet is in a harsh environment, more foreign matters such as dust will enter the energy storage cabinet through the air inlet. Therefore, at present, a filter screen is added at the air inlet for filtration to prevent foreign matters from entering the energy storage cabinet. However, setting the filter screen will increase the wind resistance, easily lead to the risk of derating of the thermal management system, and at the same time cause the problem of imbalance between the filtering effect and the wind resistance. Summary of the Invention

[0003] The present application provides a control method for the thermal management system of an energy storage cabinet and an energy storage cabinet, which are used to solve the problems that the filter screen will increase the wind resistance, easily lead to the problem of derating of the thermal management system, and at the same time cause the problem of imbalance between the filtering effect and the wind resistance.

[0004] In the first aspect of the present application, a control method for the thermal management system of an energy storage cabinet is provided. The thermal management system includes a thermal management device, a filter screen, and a driving component. The thermal management device includes an air inlet, and the driving component is used to drive the filter screen to move. The control method for the thermal management system of the energy storage cabinet at least includes the following steps:

[0005] Judge whether the thermal management device is in an on state;

[0006] When the thermal management device is in an on state, obtain the current relative concentration P of medium and small particles in the external environment, the relative concentration threshold P th and the hysteresis value a, and judge whether the current relative concentration P of medium and small particles in the external environment is greater than the relative concentration threshold P th + the hysteresis value a;

[0007] When the current relative concentration P of medium and small particles in the external environment is greater than the relative concentration threshold P th + the hysteresis value a, turn on the driving component to move the filter screen relative to the air inlet to the blocking state;

[0008] When the current relative concentration P of medium and small particles in the external environment is less than or equal to the relative concentration threshold P th + the hysteresis value a, continue to judge whether the current relative concentration P of medium and small particles in the external environment is less than the relative concentration threshold Pth - Return difference value a;

[0009] When the current relative concentration P of small and medium particles in the external environment is less than the relative concentration threshold P of small and medium particles th - By the return difference value a, the driving component is turned off, so that the filter net moves relative to the air inlet to the falling state.

[0010] Specifically, the heat management device can be an air conditioner. When it is determined that the heat management device is turned on, the control method of the heat management system of the energy storage cabinet controls the state of the filter net in real time by judging the relationship between the current relative concentration P of small and medium particles in the external environment and the relative concentration threshold P of small and medium particles in this area th and the return difference value a. When it is judged that the current relative concentration P of small and medium particles in the external environment is greater than the relative concentration threshold P of small and medium particles th + the return difference value a, that is, at this time, the concentration of small and medium particles in the external air is relatively high, and the filter net is controlled to move to the blocking state, so that the filter net can closely adhere to and block the air inlet. The filter net can filter foreign matters such as dust in the air, reduce the risk of a large amount of dust and other foreign matters flowing into the air inlet, and further reduce the risk of dust and other foreign matters blocking the air flow, so that the heat management device has a good filtering effect, so that the heat management system can maintain a good heat exchange efficiency, improve the reliability of the stable operation of the heat management system, and at the same time reduce the risk of foreign matters and the like blocking the air inlet, which is beneficial to improving the service life of the heat management device.

[0011] When it is judged that the current relative concentration P of small and medium particles in the external environment is less than or equal to the relative concentration threshold P of small and medium particles th + the return difference value a, it is continuously judged whether the current relative concentration P of small and medium particles in the external environment is less than the relative concentration threshold P of small and medium particles th - the return difference value a. When the current relative concentration P of small and medium particles in the external environment is less than the relative concentration threshold P of small and medium particles th - the return difference value a, that is, at this time, the concentration of small and medium particles in the external air is relatively low, and the filter net is controlled to move to the falling state, so that the air can flow into the air inlet without passing through the filter net, avoiding the risk of increased wind resistance caused by the filter net still being in the blocking state, increasing the air flow, reducing the risk of derating of the heat management device, and being beneficial to improving the heat exchange efficiency of the air conditioner.

[0012] Therefore, the control method of the heat management system of the energy storage cabinet controls the state of the filter net in real time by judging the relationship between the current relative concentration P of small and medium particles in the external environment and the relative concentration threshold P of small and medium particles in this area thBased on the relationship with the hysteresis value a, the state of the filter screen is controlled in real time, enabling the filter screen to adjust its state in real time according to changes in the external environment. This can effectively balance the filtering effect and air resistance, endowing the thermal management device with good working performance. Meanwhile, the thermal management device can maintain good heat exchange efficiency, as well as good working stability and service life. In addition, since the control method for the thermal management system of the energy storage cabinet determines the relative concentration P of small and medium-sized particles in the current external environment and the relative threshold P of small and medium-sized particle concentration in this area th Based on the relationship with the hysteresis value a, this control method can be applied to different regions and external environments, that is, the relative concentration P of small and medium-sized particles in the current external environment, the relative threshold P of small and medium-sized particle concentration th And the hysteresis value a will all be adjusted according to changes in the environment of different regions, improving the applicability and generality of the control method for the thermal management system of the energy storage cabinet. Moreover, the method of directly judging whether the air quality in the air is poor by judging the level of the relative concentration of small and medium-sized particles is more direct and accurate than judging wind speed, wind direction, etc. Furthermore, it is beneficial to improve the accuracy of adjusting the state of the filter screen according to changes in the external environment, and is conducive to reducing the heat exchange energy consumption of the thermal management device while enabling the thermal management device to maintain the optimal heat exchange efficiency.

[0013] In this solution, in the step of obtaining the relative concentration P of small and medium-sized particles in the current external environment, the control method for the thermal management system of the energy storage cabinet specifically includes:

[0014] Detect the concentration P1 of small and medium-sized particles in the current external environment and the maximum value P of the concentration of small and medium-sized particles in the environment where the energy storage cabinet is located max , and according to the formula: P = P1 / P max , calculate the relative concentration P of small and medium-sized particles in the current external environment.

[0015] In this solution, in the step of obtaining the relative threshold P of small and medium-sized particle concentration th , the control method for the thermal management system of the energy storage cabinet specifically includes:

[0016] According to the set threshold P2 of small and medium-sized particle concentration, and according to the formula P th= P2 / P max , calculate the relative threshold P of small and medium-sized particle concentration th .

[0017] In this solution, in the step of obtaining the hysteresis value a, the control method for the thermal management system of the energy storage cabinet specifically includes:

[0018] Detect the minimum value P of the concentration of small and medium-sized particles in the environment where the energy storage cabinet is located min , according to the formula d = (P max- P min ) / P max ;

[0019] According to the formula: , the return difference value a is calculated;

[0020] where m1 is the adjustment coefficient.

[0021] In this solution, it satisfies: 0 < a ≤ 0.2×P.

[0022] In this solution, the control method for the thermal management system of the energy storage cabinet further includes:

[0023] When the current ambient relative concentration P of medium and small particles satisfies: P th -a ≤ P ≤ P th +a, control the filter screen to maintain its original state.

[0024] In this solution, when the current ambient relative concentration P of medium and small particles is less than the relative concentration threshold P of medium and small particles th - the return difference value a, and before the step of turning off the driving component, the control method for the thermal management system of the energy storage cabinet specifically includes:

[0025] Control the thermal management device to shut down for t seconds.

[0026] In the second aspect of this application, an energy storage cabinet is provided, and the energy storage cabinet includes the control method for the thermal management system of the energy storage cabinet described above;

[0027] The energy storage cabinet includes a thermal management device, a filter screen, and a driving component. The thermal management device includes an external machine and an air inlet. The driving component is used to movably connect the filter screen to the surface of the external machine.

[0028] In this solution, the driving component includes a first connecting piece and a second connecting piece. A magnetic outer frame is further provided on the outer periphery of the filter screen. Along the height direction of the external machine, one end of the magnetic outer frame is connected to the external machine through the first connecting piece, and the other end of the magnetic outer frame is connected to the external machine through the second connecting piece. The magnetic outer frame can move relative to the second connecting piece to drive the filter screen to rotate relative to the external machine around the first connecting piece.

[0029] In this solution, the driving component includes an electromagnet. An installation groove is provided at the top of the external machine, and the installation groove is used to install the electromagnet. When the electromagnet is energized, the magnetic outer frame drives the filter screen to move towards the external machine to switch to the blocking state. When the electromagnet is de-energized, the filter screen moves away from the external machine to switch to the falling-back state.

[0030] In this solution, in the falling-back state, there is a gap S between the end of the magnetic outer frame connected to the second connecting piece and the surface of the external machine, and it satisfies: 4 cm ≤ S ≤ 8 cm.

[0031] In this solution, a gasket is further provided on the surface of the filter net facing the outdoor unit. In the shielding state, the gasket is attached to the surface of the outdoor unit, so that an included angle θ is formed between the filter net and the outdoor unit, satisfying 0.5° ≤ θ ≤ 1°.

[0032] In this solution, along the direction of the first connecting member towards the second connecting member, the thickness of the gasket gradually increases.

[0033] It should be understood that the above general description and the following detailed description are only exemplary and do not limit this application. Description of the Drawings

[0034] Figure 1 It is a flowchart of the control method for the thermal management system of the energy storage cabinet provided by this application in a specific embodiment;

[0035] Figure 2 It is a schematic structural diagram of the thermal management device provided by this application in a specific embodiment, where the filter net is in the falling-back state;

[0036] Figure 3 It is a schematic structural diagram of the thermal management device provided by this application in a specific embodiment, where the filter net is in the shielding state;

[0037] Figure 4 It is Figure 2 a partial structural diagram from another perspective;

[0038] Figure 5 It is Figure 3 a partial structural diagram from another perspective;

[0039] Figure 6 It is a schematic structural diagram of the gasket provided by this application in a specific embodiment;

[0040] Figure 7 It is a schematic structural diagram of the gasket provided by this application in another specific embodiment.

[0041] Description of the Reference Numerals:

[0042] 1 - Thermal management device;

[0043] 11 - Air inlet;

[0044] 12 - Outdoor unit;

[0045] 121 - Installation groove;

[0046] 2 - Filter net;

[0047] 3 - Magnetic outer frame;

[0048] 4 - Driving assembly;

[0049] 41 - First connecting member;

[0050] 42 - Second connecting member;

[0051] 43 - Electromagnet;

[0052] 5 - Gasket;

[0053] 51 - Through hole;

[0054] 52 - Avoidance hole;

[0055] 53 - Avoidance notch.

[0056] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present application, and are used together with the description to explain the principles of the present application. Detailed implementation manners

[0057] For a better understanding of the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0058] In a specific embodiment, the present application will be further described in detail below through specific embodiments and with reference to the accompanying drawings.

[0059] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0060] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0061] It should be understood that the term " / and" used herein is only a description of the associated relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0062] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the drawings, and should not be construed as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0063] The present application provides a control method for the thermal management system of an energy storage cabinet. As Figure 1 shown, the thermal management system includes a thermal management device 1, a filter screen 2, and a driving component 4. The thermal management device 1 includes an air inlet 11. The driving component 4 is used to drive the filter screen 2 to move. The control method for the thermal management system of the energy storage cabinet at least includes the following steps:

[0064] Judge whether the thermal management device 1 is in an on state;

[0065] When the thermal management device 1 is in an on state, obtain the current relative concentration P of medium and small particles in the external environment, the relative concentration threshold P th of medium and small particles, and the hysteresis value a, and judge whether the current relative concentration P of medium and small particles in the external environment is greater than the relative concentration threshold P th of medium and small particles + the hysteresis value a;

[0066] When the current relative concentration P of medium and small particles in the external environment is greater than the relative concentration threshold P th of medium and small particles + the hysteresis value a, turn on the driving component 4 to make the filter screen 2 move relative to the air inlet 11 to the Figure 3 shielding state shown;

[0067] When the current relative concentration P of medium and small particles in the external environment is less than or equal to the relative concentration threshold P th of medium and small particles + the hysteresis value a, continue to judge whether the current relative concentration P of medium and small particles in the external environment is less than the relative concentration threshold P th of medium and small particles - the hysteresis value a;

[0068] When the current relative concentration P of medium and small particles in the external environment is less than the relative concentration threshold P th of medium and small particles - the hysteresis value a, turn off the driving component 4 to make the filter screen 2 move relative to the air inlet 11 to the Figure 2 falling state shown;

[0069] Among them, the size of the medium and small particles for detecting the concentration of medium and small particles in the air should be greater than 10um. The filter screen 2 can be made of materials such as non-woven fabric and filter cotton that can filter tiny particles in the air.

[0070] Specifically, the thermal management device 1 can be an air conditioner. After it is determined that the thermal management device 1 is turned on, the control method for the thermal management system of the energy storage cabinet controls the state of the filter net 2 in real time by judging the relationship between the current relative concentration P of small and medium-sized particles in the external environment and the relative concentration threshold P of small and medium-sized particles in this area th and the hysteresis value a. When it is judged that the current relative concentration P of small and medium-sized particles in the external environment is greater than the relative concentration threshold P of small and medium-sized particles th + the hysteresis value a, that is, when the concentration of small and medium-sized particles in the external air is relatively high at this time, the filter net 2 is controlled to move to the blocking state, so that the filter net 2 can closely adhere to and block the air inlet 11. The filter net 2 can filter foreign matters such as dust in the air, reduce the risk of a large amount of dust and other foreign matters flowing into the air inlet 11, and further reduce the risk of dust and other foreign matters blocking the air flow, so that the thermal management device 1 has a good filtering effect, so that the thermal management system can maintain a good heat exchange efficiency, improve the reliability of the stable operation of the thermal management system, and at the same time reduce the risk of the air inlet 11 being blocked by foreign matters, which is beneficial to improving the service life of the thermal management device 1

[0071] When it is judged that the current relative concentration P of small and medium-sized particles in the external environment is less than or equal to the relative concentration threshold P of small and medium-sized particles th + the hysteresis value a, it is continued to judge whether the current relative concentration P of small and medium-sized particles in the external environment is less than the relative concentration threshold P of small and medium-sized particles th - the hysteresis value a. When the current relative concentration P of small and medium-sized particles in the external environment is less than the relative concentration threshold P of small and medium-sized particles th - the hysteresis value a, that is, when the concentration of small and medium-sized particles in the external air is relatively low at this time, the filter net 2 is controlled to move to the falling state, so that the air can flow into the air inlet 11 without passing through the filter net 2, avoiding the risk of increased wind resistance caused by the filter net 2 still being in the blocking state, increasing the air flow, and reducing the risk of derating of the thermal management device 1, that is, the risk of derating of the compressor in the air conditioner, and avoiding the risk of reduced cooling capacity of the thermal management device 1, which is beneficial to improving the heat exchange efficiency of the air conditioner

[0072] Therefore, the control method for the thermal management system of the energy storage cabinet controls the state of the filter net 2 in real time by judging the relationship between the current relative concentration P of small and medium-sized particles in the external environment and the relative concentration threshold P of small and medium-sized particles in this area th and the hysteresis value a, so that the filter net 2 can adjust its state in real time according to the change of the relative concentration of small and medium-sized particles in the external environment, and can effectively balance the filtering effect and wind resistance, so that the thermal management device 1 has good working performance. In addition, since the control method for the thermal management system of the energy storage cabinet judges the relationship between the current relative concentration P of small and medium-sized particles in the external environment and the relative concentration threshold P of small and medium-sized particles in this area th and the hysteresis value a, this control method can be applied to different regions and different external environments, that is, the current relative concentration P of small and medium-sized particles in the external environment, the relative concentration threshold P of small and medium-sized particlesth As well as the return difference value a will be adjusted according to the changes in the environment of different regions, improving the applicability and generality of the control method of the thermal management system of the energy storage cabinet. Moreover, the method of directly judging whether the air quality in the air is poor by judging the level of the relative concentration of medium and small particles is more direct and accurate than judging the wind speed, wind direction, etc. Furthermore, it is beneficial to improve the accuracy of adjusting the state of the filter net 2 according to the changes in the external environment, and is beneficial to reducing the heat exchange energy consumption of the thermal management device 1 while enabling the thermal management device 1 to maintain the optimal heat exchange efficiency.

[0073] In addition, compare the relative concentration P of medium and small particles in the current external environment with the relative concentration threshold P of medium and small particles th - the return difference value a, or, compare the relative concentration P of medium and small particles in the current external environment with the relative concentration threshold P of medium and small particles th + the return difference value a. When the relative concentration P of medium and small particles in the current external environment is approximately equal to the relative concentration threshold P of medium and small particles th At this time, by adding or subtracting the return difference value a term, it is possible to reduce the risk of the relative concentration P of medium and small particles in the current external environment fluctuating and causing the filter net 2 to repeatedly switch to the blocking state or the falling state, and reduce the risk of increasing the energy consumption of the thermal management system of the energy storage cabinet.

[0074] Table 1

[0075]

[0076] The thermal management device 1 is selected as an air conditioner with an applicable voltage of 230V and an operating frequency of 50Hz. The filter net 2 can be selected as a filter net with a specification of G2, that is, the G2 filter net can capture 50%-70% of the air particles larger than 10μm. As can be seen from Table 1, when the controlled external environmental conditions are the same and the fan power of the thermal management device 1 remains consistent, after controlling the filter net 2 on the thermal management device 1 to be in a certain state, the fan power of the thermal management device 1 is 187w, and the detected air intake of the thermal management device 1 is 512m 3 / h, and the cooling capacity of the thermal management device 1 is 1.47KW; after controlling the filter net 2 on the thermal management device 1 to be in the blocking state, the fan power of the thermal management device 1 is 187w, and the detected air intake of the thermal management device 1 is 698m 3 / h, the cooling capacity of the heat management device 1 is 2KW. Therefore, it can be known that under the condition of the same fan power and external environment, the air intake volume of the filter net 2 of the heat management device 1 in the falling state is larger than that in the blocked state, that is, it means that the air resistance of the filter net 2 of the heat management device 1 in the falling state is smaller than that in the blocked state. It can be seen that the cooling capacity of the filter net 2 in the falling state is larger than that in the blocked state, that is, when the filter net 2 is in the falling state, the heat management device 1 has a good cooling effect, and can effectively balance the filtering effect and air resistance, so that the heat management system of the energy storage cabinet maintains the optimal working state. In a possible implementation manner, structures such as louvers or grilles are provided on the air inlet 11, and when the filter net 2 is in the falling state, the risk of foreign objects such as flying insects entering the external unit 12 through the air inlet 11 is avoided, and the reliability of the energy storage cabinet is improved.

[0077] In a possible implementation manner, as Figure 1 shown, in the step of obtaining the relative concentration P of small and medium particles in the current external environment, the control method of the heat management system of the energy storage cabinet specifically includes:

[0078] Detect the concentration P1 of small and medium particles in the current external environment and the maximum value P of the concentration of small and medium particles in the environment where the energy storage cabinet is located max , and according to the formula: P = P1 / P max , calculate the relative concentration P of small and medium particles in the current external environment. Among them, the maximum value P of the concentration of small and medium particles in the environment where the energy storage cabinet is located max can be the maximum value of the concentration of small and medium particles in the environment of this area within 30 days.

[0079] Specifically, the heat management system of the energy storage cabinet is provided with a dust sensor, and the dust sensor can be arranged on the outer surface of the heat management device 1. The dust sensor is used to detect the concentration P1 of small and medium particle dust in the current external environment and the maximum value P of the concentration of small and medium particles in the environment where the energy storage cabinet is located max .

[0080] Through the formula: P = P1 / P max , calculate the relative concentration P of small and medium particles in the current external environment. That is, by adopting the calculation method of relative value, it can more intuitively reflect whether the concentration P1 of small and medium particle dust in the current external environment is relatively high or low in the local environment, and improve the adaptability and sensitivity of the control method of the heat management system of the energy storage cabinet.

[0081] In a possible implementation manner, as Figure 1 shown, in the step of obtaining the relative small and medium particle concentration threshold P th , the control method of the heat management system of the energy storage cabinet specifically includes:

[0082] According to the set medium and small particle concentration threshold P2, and according to the formula P th =P2 / P max , calculate the relative medium and small particle concentration threshold P th .

[0083] Specifically, the medium and small particle concentration threshold P2 is the input threshold, and the value of the medium and small particle concentration threshold P2 can be determined according to factors such as the user requirements of the thermal management system of the energy storage cabinet, the local environment, and local laws and regulations. The recommended value range of the medium and small particle concentration threshold P2 is: 300~500ug / m 3 .

[0084] Through the formula: P th =P2 / P max , calculate the relative medium and small particle concentration threshold P th , that is, by adopting the calculation method of relative value, so that the calculated value of the relative medium and small particle concentration threshold P th can be adaptively adjusted according to the distribution of the medium and small particle concentration threshold in the air that should be satisfied in this area. Compared with the fixed threshold, by calculating the relative medium and small particle concentration threshold P th of the present application, the adaptability of the control method of the thermal management system of the energy storage cabinet under different environmental requirements can be greatly improved.

[0085] In summary, due to different dust prevention requirements in different regions, by adopting the calculation method of relative value and the method of comparing the relative medium and small particle concentration P of the current external environment with the relative medium and small particle concentration threshold P th , when the thermal management system of the energy storage cabinet is in different regions, it can adjust and judge by itself according to the distribution of the medium and small particle concentration in the air in the region where it is located, so that the control method of the thermal management system of the energy storage cabinet has a certain applicability. Furthermore, the control method of the thermal management system of the energy storage cabinet can adaptively adjust the state of the filter net 2 according to the environment in different regions where it is located, so that the control method of the thermal management system of the energy storage cabinet can meet the dust prevention requirements under different environmental conditions.

[0086] In a possible implementation manner, as Figure 1 shown, in the step of obtaining the return difference a, the control method of the thermal management system of the energy storage cabinet specifically includes:

[0087] Detect the minimum value P min of the medium and small particle concentration that appears in the environment where the energy storage cabinet is located. According to the formula d = (P max - P min ) / P max . Among them, the minimum value P min of the medium and small particle concentration that appears in the environment where the energy storage cabinet is located can be the minimum value of the medium and small particle concentration that appears in the environment of this area within 30 days.

[0088] According to the formula: , the return difference value a is calculated;

[0089] Among them, m1 is an adjustment coefficient, and m1 is used to adjust the size of the return difference value a, that is, to adjust the sensitivity of the thermal management system of the energy storage cabinet. It should be noted that the larger m1 is, the higher the robustness of the thermal management system of the energy storage cabinet. At the same time, the value of m1 should not make the return difference value a > 0.2, so that the size of the return difference value is moderate, reducing the problem that too large a return difference value affects the judgment accuracy of the control method of the thermal management system of the energy storage cabinet, and improving the accuracy of adjusting the filter net 2. Specifically, the default value of m1 is 1, and the value of m1 mainly depends on the user's usage requirements and the volatility of the small particle concentration P1 in the current external environment. If it is required that the thermal management device 1 can respond promptly and sensitively according to the change of the relative small particle concentration P in the current external environment, the value of m1 should be less than 1. If it is required that the thermal management device 1 has high stability and avoids frequent switching of the state of the filter net 2, the value of m1 should be greater than 1. For example, within one hour, the number of times the detected small particle concentration P1 in the current external environment reaches the maximum value P of the small particle concentration in the environment where the energy storage cabinet is located max does not exceed five times, and the number of times the small particle concentration P1 in the current external environment reaches the minimum value P of the small particle concentration in the environment where the energy storage cabinet is located min does not exceed 5 times, and at the same time the user does not have relatively strict dust prevention requirements, then the value of m1 is 1. When the small particle concentration in the environment where the energy storage cabinet is located changes frequently and greatly, such as when the relative small particle concentration P in the current external environment is detected to be 50% within one hour, and the value of the relative small particle concentration P in the current external environment fluctuates frequently up and down within a range of about 10%, at this time, m1 can be set to 1.5, which is beneficial to avoiding frequent switching of the state of the filter net 2 controlled by the thermal management device 1. When the small particle concentration in the environment where the energy storage cabinet is located changes frequently and slightly, such as when the relative small particle concentration P in the current external environment is detected to be 50% within one hour, and the maximum frequent fluctuation range of the value of the relative small particle concentration P in the current external environment does not exceed 5%, and the change is slow, and the user has relatively strict requirements for the dust prevention effect of the system, at this time, m1 can be set to 0.6 to ensure that the thermal management system of the energy storage cabinet can respond quickly. Among them, d can be the maximum difference in the relative small particle concentration within 30 days in the environment where the thermal management system of the energy storage cabinet is located. Calculating d is beneficial to improving the adaptability of the return difference value a in the current environment, and improving the accuracy and timeliness of adjusting the filter net 2.

[0090] From the formula: it can be seen that the size of the return difference value a is related to the relative small particle concentration P in the current external environment and the relative small particle concentration threshold P thare all related, which is beneficial to reduce the influence of the hysteresis value a on the judgment of the concentration of small particles in the air. At the same time, it can reduce the relative concentration of small and medium particles in the current external environment P to be approximately equal to the relative small and medium particle concentration threshold P th The risk of frequent switching of filter 2 status occurs. Specifically, the first term in the formula: Represents the relative small and medium particle concentration threshold P th The impact on the hysteresis value a, so that the hysteresis value can be adjusted according to different regions or different environments with the relative small and medium particle concentration threshold P th The hysteresis value a can be adjusted according to the change of the small and medium particle concentration threshold value P, so that the hysteresis value a can be applied to different regions and different environments. : Relative small and medium particle concentration threshold P th The impact on the hysteresis value a is by default the relative small and medium particle concentration threshold P th If the relative small and medium particle concentration threshold value P is exceeded, th If the concentration of particles is less than 10%, the response capability of the thermal management system of the energy storage cabinet will decrease. th 10% will reduce the stability of the thermal management system of the energy storage cabinet, causing the filter 2 to frequently switch states. th The impact on the hysteresis value a is by default the relative small and medium particle concentration threshold P th 10% of the energy storage cabinet’s thermal management system can have good responsiveness and stability.

[0091] The second term in the formula: Indicates the influence of the maximum difference d of the relative small and medium particle concentration on the hysteresis value a. When the maximum or minimum small and medium particle concentration in the external environment changes too much or too little, the system can adaptively adjust the hysteresis value a to avoid the filter 2 frequently changing its working state and the thermal management system of the energy storage cabinet responding too slowly to the change of the small and medium particle concentration in the external environment, thereby further improving the adaptability of the hysteresis value a. The values ​​of -0.05 and 0.1 are based on the following: when the maximum difference d of the relative small and medium particle concentration in the environment where the thermal management system of the energy storage cabinet is located is the maximum value 1, this item The value of is 5%, that is, the maximum influence of the maximum difference d in the concentration of relatively small and medium particles in the environment where the thermal management system of the energy storage cabinet is located on the hysteresis value a is at most 5% under default conditions. This item adopts the form of an exponential function because, according to the values of the coefficients in the formula, as d increases, the absolute value of the derivative of this item decreases, that is, as the value of d increases, the change of this item becomes gentler, which can better meet the actual application conditions. This item enables the hysteresis value a to change rapidly when the value of d is small, improving the response speed of the thermal management system of the energy storage cabinet; when the value of d is large, it remains relatively stable. In summary, this makes this item not fail to obtain an appropriate value due to the value of d being too small, nor produce a drastic change due to the value of d being too large.

[0092] In some embodiments, when the maximum difference d in the concentration of relatively small and medium particles takes the maximum value of 1, the second item: The value of is 5%, indicating that the maximum influence of the maximum difference d in the concentration of relatively small and medium particles will not exceed 5%, thereby avoiding the problem that the thermal management system of the energy storage cabinet responds too slowly to changes in the concentration of small and medium particles in the external environment, improving the response speed of the thermal management system of the energy storage cabinet, so as to be able to switch the state of the filter net 2 in a timely manner.

[0093] In a possible implementation manner, it satisfies: 0 < a ≤ 0.2×P, that is, the magnitude of the hysteresis value a should not exceed 20% of the current relative concentration of small and medium particles P in the external environment, reducing the influence of the hysteresis value a being too large on the inaccurate calculation and judgment of the relative concentration of small and medium particles, and improving the accuracy of controlling the switching state of the filter net 2.

[0094] In a possible implementation manner, as Figure 1 shown, the control method of the thermal management system of the energy storage cabinet further includes:

[0095] When the current relative concentration of small and medium particles P in the external environment satisfies: P th - a ≤ P ≤ P th + a, control the filter net 2 to maintain its original state.

[0096] In this embodiment, when the current relative concentration of small and medium particles P in the external environment fluctuates between P th - a and P th + a, that is, when the current relative concentration of small and medium particles P in the external environment is moderate at this moment, still control the filter net 2 to maintain its current original state, that is, the filter net 2 is in the blocked state or the falling state, avoiding the driving component 4 from frequently starting and stopping when the current relative concentration of small and medium particles P in the external environment fluctuates between P th - a and P th + a, and at the same time, it is beneficial to reduce the energy consumption of the thermal management system of the energy storage cabinet.

[0097] In a possible implementation manner, asFigure 1 As shown, when the relative concentration P of small and medium particles in the current external environment is less than the relative concentration threshold P of small and medium particles th - by the hysteresis value a, and before the step of turning off the drive assembly 4, the control method for the thermal management system of the energy storage cabinet specifically includes:

[0098] Control the thermal management device 1 to shut down for t seconds.

[0099] In this example, by controlling the thermal management device 1 to shut down for t seconds, the suction force near the air inlet 11 of the thermal management device 1 is reduced, avoiding the risk that the filter net 2 cannot be smoothly switched to the falling state due to the existence of suction force, and improving the reliability of the filter net 2 to switch to the falling state.

[0100] In a possible implementation manner, 1 second ≤ t ≤ 3 seconds is satisfied. In some embodiments, t can be 1 second, 1.1 seconds, 1.2 seconds, 1.3 seconds, 1.4 seconds, 1.5 seconds, 1.6 seconds, 1.7 seconds, 1.8 seconds, 1.9 seconds, 2 seconds, 2.1 seconds, 2.2 seconds, 2.3 seconds, 2.4 seconds, 2.5 seconds, 2.6 seconds, 2.7 seconds, 2.8 seconds, 2.9 seconds, 3 seconds.

[0101] When 1 second ≤ t ≤ 3 seconds is satisfied, the time for controlling the thermal management device 1 to shut down is appropriate, which is beneficial to reducing the suction force at the air inlet 11 and at the same time does not affect the refrigeration effect of the thermal management device 1.

[0102] In a possible implementation manner, as Figure 1 shown, the control method for the thermal management system of the energy storage cabinet further includes:

[0103] When the thermal management device 1 is in the off state, turn off the drive assembly 4 to make the filter net 2 in the falling state, which is beneficial to reducing the energy consumption of the thermal management system of the energy storage cabinet.

[0104] This application also provides an energy storage cabinet, as Figures 2 - 5 shown, the energy storage cabinet includes the control method for the thermal management system of the energy storage cabinet in any of the above embodiments;

[0105] The energy storage cabinet includes a thermal management device 1, a filter net 2 and a drive assembly 4. The thermal management device 1 includes an external unit 12 and an air inlet 11. The drive assembly 4 is used to movably connect the filter net 2 to the surface of the external unit 12, and under the drive of the drive assembly 4, the filter net 2 can be controlled to switch to the falling state and the blocking state.

[0106] Therefore, when the control method for the thermal management system of the energy storage cabinet is used for the energy storage cabinet, by judging the relative concentration P of small and medium particles in the current external environment and the relative concentration threshold P of small and medium particles in this area thBased on the relationship with the return difference value a, the state of the filter net 2 is controlled in real time, so that the filter net 2 can be switched to the falling state or the blocking state in real time according to the changes in the external environment, enabling the heat management device 1 to maintain good heat exchange efficiency under different external environments, thereby improving the heat exchange capacity of the energy storage cabinet, and at the same time improving the good working stability and service life of the energy storage cabinet.

[0107] In a possible implementation manner, as Figure 3 and Figure 4 shown, the driving component 4 includes a first connecting member 41 and a second connecting member 42. A magnetic outer frame 3 is further provided on the outer periphery of the filter net 2. Along the height direction of the external unit 12, one end of the magnetic outer frame 3 is connected to the external unit 12 through the first connecting member 41, and the other end of the magnetic outer frame 3 is connected to the external unit 12 through the second connecting member 42. The magnetic outer frame 3 can move relative to the second connecting member 42 to drive the filter net 2 to rotate relative to the external unit 12 around the first connecting member 41.

[0108] Specifically, the magnetic outer frame 3 includes a first end and a second end. The first end is used to connect to the first connecting member 41, and the second end is used to connect to the second connecting member 42. When the relative medium and small particle concentration P of the current external environment is greater than the relative medium and small particle concentration threshold P th + the return difference value a, control the second end of the magnetic outer frame 3 to move towards the direction close to the surface of the external unit 12, and at the same time drive the first end of the magnetic outer frame 3 to rotate around the first connecting member 41, so that the magnetic outer frame 3 can fit on the surface of the external unit 12, that is, switch the filter net 2 to the blocking state. At this time, the filter net 2 can fit at the air inlet 11.

[0109] When the relative medium and small particle concentration P of the current external environment is less than the relative medium and small particle concentration threshold P th - the return difference value a, control the second end of the magnetic outer frame 3 to move towards the direction away from the surface of the external unit 12, and at the same time drive the first end of the magnetic outer frame 3 to rotate around the first connecting member 41, so that the magnetic outer frame 3 forms at least a certain angle with the surface of the external unit 12, that is, switch the filter net 2 to the falling state.

[0110] Therefore, the magnetic outer frame 3 is movably connected to the surface of the external unit 12 through the first connecting member 41 and the second connecting member 42, improving the feasibility and reliability of driving the magnetic outer frame 3 to switch the filter net 2 to the blocking state or the falling state. Among them, as Figure 3 shown, the first connecting member 41 can be any one of a hinge, a hinge or a rotating shaft, and the second connecting member 42 can be a guide rail. The structures of the first connecting member 41 and the second connecting member 42 are simple and convenient for production, and the movement is stable.

[0111] In other embodiments, the second connecting member 42 can also be a connecting rod structure to control the magnetic outer frame 3 to drive the filter net 2 to move relative to the external unit 12.

[0112] In a possible implementation, as Figure 2 shown, the driving component 4 includes an electromagnet 43. An installation groove 121 is provided at the top of the external unit 12. The installation groove 121 is used to install the electromagnet 43. When the electromagnet 43 is powered on, the magnetic outer frame 3 drives the filter screen 2 to move towards the external unit 12 to switch to the shielding state. When the electromagnet 43 is not powered on, the filter screen 2 moves away from the external unit 12 to switch to the falling state.

[0113] Specifically, as Figure 3 and Figure 4 shown, when the first connecting member 41 is a hinge and the second connecting member 42 is a guide rail, the second connecting member 42 is rotatably connected to the external unit 12. When the relative medium and small particle concentration P in the current external environment is greater than the relative medium and small particle concentration threshold P th + hysteresis value a, the battery management system (Battery Management System - BMS) in the energy storage cabinet controls the electromagnet 43 to be powered on. Under the action of the magnetic force, the second end of the magnetic outer frame 3 slides along the second connecting member 42 towards the surface of the external unit 12, and the first end rotates around the first connecting member 41. At the same time, the second guide rail rotates relative to the surface of the external unit 12, so that the magnetic outer frame 3 drives the filter screen 2 to switch to the shielding state. When the relative medium and small particle concentration P in the current external environment is less than the relative medium and small particle concentration threshold P th - hysteresis value a, the battery management system (Battery Management System - BMS) in the energy storage cabinet controls the electromagnet 43 to stop being powered on, so that there is no longer a magnetic attraction force between the magnetic outer frame 3 and the electromagnet 43. Under the action of gravity, the second end of the magnetic outer frame 3 slides along the second connecting member 42 away from the surface of the external unit 12, and the first end rotates around the first connecting member 41. At the same time, the second guide rail rotates relative to the surface of the external unit 12, so that the magnetic outer frame 3 drives the filter screen 2 to switch to the falling state.

[0114] Therefore, an electromagnet 43 is provided at a position on the surface of the external unit 12 close to the second end. By controlling the electromagnet 43 to be powered on or off, the state of the filter screen 2 is switched. Compared with the method of electrically controlling the movement of the first connecting member 41 and the second connecting member 42, in this application, the filter screen 2 can quickly respond and switch to the corresponding state by means of magnetic attraction, improving the control accuracy. At the same time, during the process of the filter screen 2 switching to the falling state, no electricity is required, which is beneficial to reducing the energy consumption of the energy storage cabinet.

[0115] In a possible implementation, the external unit 12 may also be provided with a wind sensor. When it is determined that the wind force in the external environment is large and when the relative medium and small particle concentration P in the current external environment is less than or equal to the relative medium and small particle concentration threshold P thWhen the return difference value is a, the battery management system (Battery Management System - BMS) in the energy storage cabinet controls the electromagnet 43 to increase the magnetic suction force, such as increasing the energizing current, so that the magnetic outer frame 3 can firmly fit on the surface of the outdoor unit 12, thereby improving the stability of the filter net 2 in the blocking state and reducing the risk of the filter net 2 being blown away by the wind.

[0116] In a possible implementation manner, as Figure 2 and Figure 4 shown, in the falling state, there is a gap S between the end of the magnetic outer frame 3 connected to the second connecting member 42 and the surface of the outdoor unit 12, satisfying: 4 cm ≤ S ≤ 8 cm, that is, the magnetic outer frame 3 forms a certain angle with the surface of the outdoor unit 12. In some embodiments, S can be 4 cm, 4.5 cm, 5 cm, 5.5 cm, 6 cm, 6.5 cm, 7 cm, 7.5 cm, 8 cm, etc., and the corresponding angle between the magnetic outer frame 3 and the surface of the outdoor unit 12 can be between 25° - 35°, for example, the angle can be 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, etc.

[0117] Specifically, the second connecting member 42 can be provided with a limiting function to limit the distance between the second end and the surface of the outdoor unit 12 to S. When 4 cm ≤ S ≤ 8 cm, the distance between the second end of the magnetic outer frame 3 and the surface of the outdoor unit 12 is appropriate, that is, the distance between the electromagnet 43 and the second end is appropriate, reducing the risk of magnetic attraction failure due to too far a distance, which is beneficial to improving the reliability of the filter net 2 switching to the blocking state. At the same time, the angle between the magnetic outer frame 3 and the surface of the outdoor unit 12 is appropriate, so that air can smoothly flow into the air inlet 11 through the gap, which is beneficial to reducing the wind resistance and at the same time reducing the occupied space of the filter net 2.

[0118] In addition, as Figure 3 and Figure 4 shown, when the first connecting member 41 is a hinge, in the falling state, the distance between the second end and the surface of the outdoor unit 12 is S, and the opening and closing angle of the first connecting member 41 can be between 60° - 65°, avoiding the risk of a small opening and closing angle of the first connecting member 41, so that the first connecting member 41 plays a good supporting role for the magnetic outer frame 3, reducing the risk of excessive movement of the second end under the action of gravity, thereby reducing the risk of the second end slipping off the second connecting member 42 and improving the use safety and reliability of the energy storage cabinet.

[0119] In a possible implementation manner, as Figure 4 and Figure 5As shown, a gasket 5 is further provided on the surface of the filter net 2 facing the outdoor unit 12. In the shielding state, the gasket 5 is in contact with the surface of the outdoor unit 12, so that an included angle θ is formed between the filter net 2 and the outdoor unit 12, satisfying 0.5° ≤ θ ≤ 1°. In some embodiments, θ can be 0.5°, 0.6°, 0.7°, 0.8°, 0.9°, 1°, etc.

[0120] In this embodiment, by providing a gasket 5 between the magnetic outer frame 3 and the surface of the outdoor unit 12, in the shielding state, an included angle θ is formed between the filter net 2 and the outdoor unit 12. When the power supply to the electromagnet 43 is stopped, it is beneficial to reduce the suction force generated by the air at the air inlet on the filter net 2 and the magnetic outer frame 3, so that the filter net 2 can smoothly switch to the falling state, improving the reliability and stability of the energy storage cabinet during operation.

[0121] In a possible implementation manner, as Figure 4 and Figure 5 shown, along the direction of the first connecting member 41 towards the second connecting member 42, the thickness of the gasket 5 gradually increases, that is, the thickness of the gasket 5 near the first end is thinner, and the thickness of the gasket 5 near the second end is thicker, so that the gasket 5 can slightly lift the second end of the magnetic outer frame 3, making the magnetic outer frame 3 and the filter net 2 non-parallel to the outdoor unit 12, improving the feasibility of having an included angle θ between the filter net 2 and the outdoor unit 12, and reducing the difficulty of the filter switching to the falling state.

[0122] Specifically, as Figure 6 shown, the gasket 5 can be fixed on the magnetic outer frame 3, and the outer contour of the gasket 5 can be the same as the contour of the magnetic outer frame 3, that is, a through hole 51 is provided in the middle of the gasket 5, so that the air flows into the air inlet 11 through the through hole 51 after being filtered by the filter net 2. At the same time, the gasket 5 can also be provided with an avoidance hole 52, and the size of the avoidance hole 52 is at least the same as the size of the installation groove 121. In the shielding state, the avoidance hole 52 corresponds to the installation groove 121, that is, the avoidance hole 52 is used to avoid the installation groove 121, improving the magnetic suction force of the electromagnet 43 installed in the installation groove 121 on the magnetic outer frame 3, so that the filter net 2 can be stably maintained in the shielding state.

[0123] In addition, the gasket 5 can be made of a material with a sealing effect such as rubber. In the shielding state, the gasket 5 can be used for sealing, which is beneficial to improving the filtering effect of the energy storage cabinet.

[0124] In another possible implementation manner, the shape of the gasket 5 is as Figure 7 shown. The gasket 5 is provided with an avoidance notch 53 for avoiding the installation groove 121. In addition, the area of the gasket 5 in this embodiment is small, which is beneficial to reducing the weight of the gasket 5, facilitating the driving of the gasket 5 to move together with the magnetic outer frame 3. At the same time, a sealing member can also be provided on the surface of the outdoor unit 12 to improve the filtering effect.

[0125] In other embodiments, pads may also be provided on both sides of the installation groove 121. The function of the pads is the same as that of the gasket 5, and as long as the second end is slightly lifted in the shielding state.

[0126] The above are only specific implementation manners of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered by the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A thermal management system control method for an energy storage cabinet, characterized in that: The thermal management system comprises a thermal management device (1), a filter (2) and a drive assembly (4); the thermal management device (1) comprises an air inlet (11); the drive assembly (4) is used to drive the filter (2) to move; and the thermal management system control method of the energy storage cabinet comprises at least the following steps: Determining whether the thermal management device (1) is in an on state; When the thermal management device (1) is in the on state, the relative small and medium particle concentration P of the current external environment and the relative small and medium particle concentration threshold P are obtained. th and the hysteresis value a, to determine whether the relative small and medium particle concentration P of the current external environment is greater than the relative small and medium particle concentration threshold P th + hysteresis value a; When the relative small and medium particle concentration P of the current external environment is greater than the relative small and medium particle concentration threshold P th + hysteresis value a, turning on the driving component (4) to move the filter screen (2) relative to the air inlet (11) to a shielding state; When the relative small and medium particle concentration P of the current external environment is less than or equal to the relative small and medium particle concentration threshold P th + hysteresis value a, continue to judge whether the relative small and medium particle concentration P of the current external environment is less than the relative small and medium particle concentration threshold P th - Hysteresis value a; When the relative small and medium particle concentration P of the current external environment is less than the relative small and medium particle concentration threshold P th - when the hysteresis value is a, the driving component (4) is closed, so that the filter (2) moves relative to the air inlet (11) to a falling state; In the step of obtaining the relative small and medium particle concentration P of the current external environment, the thermal management system control method of the energy storage cabinet specifically includes: Detect the small particle concentration P1 in the current external environment and the maximum value P of the small and medium particle concentration in the environment where the energy storage cabinet is located. max , and according to the formula: P=P1 / P max , calculate the relative concentration of small and medium particles P in the current external environment; After obtaining the relative small and medium particle concentration threshold P th In the step, the thermal management system control method of the energy storage cabinet specifically includes: According to the set small and medium particle concentration threshold P2, and according to the formula P th= P2 / P max , calculate the relative small and medium particle concentration threshold P th ; In the step of obtaining the hysteresis value a, the thermal management system control method of the energy storage cabinet specifically includes: Detect the minimum value P of the concentration of small and medium particles in the environment where the energy storage cabinet is located min According to the formula d = (P max- P min ) / P max ; According to the formula: , calculate the hysteresis value a; Wherein, m1 is the adjustment coefficient, and d is the maximum difference in the relative small and medium particle concentration within 30 days in the environment where the thermal management system is located.

2. The thermal management system control method of the energy storage cabinet according to claim 1, characterized in that: Satisfies: 0<a≤0.2×P.

3. The thermal management system control method of the energy storage cabinet according to claim 1, characterized in that: The thermal management system control method of the energy storage cabinet also includes: When the current external environment relative to the concentration of small and medium particles P satisfies: P th -a≤P≤P th +a, the filter (2) is controlled to maintain its original state.

4. The thermal management system control method of the energy storage cabinet according to claim 1, characterized in that: When the relative small and medium particle concentration P of the current external environment is less than the relative small and medium particle concentration threshold P th -hysteresis value a, and before the step of shutting down the drive component (4), the thermal management system control method of the energy storage cabinet specifically includes: The thermal management device (1) is controlled to shut down for t seconds.

5. Energy storage cabinet, characterized in that: The energy storage cabinet comprises a thermal management system control method for an energy storage cabinet according to any one of claims 1 to 4; The energy storage cabinet comprises a thermal management device (1), a filter (2) and a drive assembly (4); the thermal management device (1) comprises an external unit (12) and an air inlet (11); and the drive assembly (4) is used to movably connect the filter (2) to the surface of the external unit (12).

6. The energy storage cabinet according to claim 5, characterized in that: The driving assembly (4) comprises a first connecting member (41) and a second connecting member (42); a magnetic outer frame (3) is further provided on the outer periphery of the filter screen (2); along the height direction of the external machine (12), one end of the magnetic outer frame (3) is connected to the external machine (12) via the first connecting member (41); the other end of the magnetic outer frame (3) is connected to the external machine (12) via the second connecting member (42); the magnetic outer frame (3) can move relative to the second connecting member (42) to drive the filter screen (2) to rotate around the first connecting member (41) relative to the external machine (12).

7. The energy storage cabinet according to claim 6, characterized in that: The driving assembly (4) comprises an electromagnet (43). A mounting groove is provided at the top of the external unit (12). The mounting groove is used to mount the electromagnet (43). When the electromagnet (43) is energized, the magnetic outer frame (3) drives the filter (2) to move toward the external unit (12) to switch to a shielding state. When the electromagnet (43) is not energized, the filter (2) moves away from the external unit (12) to switch to a falling state.

8. The energy storage cabinet according to claim 6, characterized in that: In the falling back state, there is a gap S between the end of the magnetic outer frame (3) connected to the second connecting member (42) and the surface of the external machine (12), satisfying: 4cm≤S≤8cm.

9. The energy storage cabinet according to claim 6, characterized in that: A gasket (5) is also provided on the surface of the filter (2) facing the external unit (12); in the shielding state, the gasket (5) is in contact with the surface of the external unit (12), so that an angle θ is formed between the filter (2) and the external unit (12), satisfying 0.5°≤θ≤1°.

10. The energy storage cabinet according to claim 9, characterized in that: Along the direction from the first connecting member (41) to the second connecting member (42), the thickness of the gasket (5) gradually increases.

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