Main control box, energy storage system, and electric device

Abstract

A main control box, an energy storage system, and an electric device. The main control box comprises: a box body accommodating a control component of a battery; and a box cover arranged above the box body and covering the box body, wherein a water absorption layer is arranged on the lower surface of the box cover, and the water absorption layer is used for absorbing water vapor in the main control box; and the control component comprises a battery management unit, and the orthographic projection of the water absorption layer on the box cover covers the orthographic projection of the battery management unit on the box cover. The stability of the performance of the main control box can be improved.

Description

Main control box, energy storage system and power consumption device

[0001] This application claims priority to the utility model application filed with the Patent Office of China on July 31, 2023, with application number 202322029230.8 and invention name “Main control box, energy storage system and electrical device”, all contents of which are incorporated into this application by application. Technical Field

[0002] The embodiments of the present application relate to the field of battery technology, and in particular to a main control box, an energy storage system, and an electrical device. Background Art

[0003] The traditional main control box does not take water vapor condensation into consideration inside the box, and only performs external sealing control, which easily produces condensation. When the condensation drips onto the core components inside the box, it may affect the performance stability of the main control box.

[0004] Summary of the Invention

[0005] In view of this, an embodiment of the present application provides a main control box, an energy storage system, and an electrical device, which can improve the performance stability of the main control box.

[0006] In a first aspect, a main control box is provided, comprising: a box body, accommodating battery control components; a box cover, arranged above the box body, covering the box body; wherein a water-absorbing layer is provided on the lower surface of the box cover, and the water-absorbing layer is used to absorb water vapor in the main control box; the control components include a battery management unit, and the orthographic projection of the water-absorbing layer on the box cover covers the orthographic projection of the battery management unit on the box cover.

[0007] In this embodiment, by providing an orthographic projection of the water-absorbing layer on the case lid that covers the orthographic projection of the battery management unit on the case lid, the probability of condensation forming above the battery management unit can be reduced, thereby reducing the possibility of condensation dripping onto the battery management unit, thereby improving the performance stability of the main control box. Furthermore, the water-absorbing layer can be provided only above the battery management unit, which can reduce the cost of the main control box.

[0008] In a possible implementation, the main control box further includes a drainage structure, which is used to drain condensed water generated above the battery management unit to outside the battery management unit.

[0009] In this embodiment, even if the water absorption effect of the water absorption layer is not good enough, resulting in condensation water being generated, by setting a drainage structure in the main control box, the condensation water generated above the battery management unit will not drip onto the battery management unit, thereby further improving the performance stability of the main control box.

[0010] In one possible implementation, the drainage structure includes a drainage plate, which is arranged below the water absorption layer and covers at least a portion of the water absorption layer; the drainage plate forms an opening between the first end of the drainage plate in the first direction and the box cover, and the second end of the drainage plate in the first direction is fixedly connected to the box cover; wherein the orthographic projection of the first end on the box cover is staggered with the orthographic projection of the battery management unit on the box cover, and the first direction is perpendicular to the gravity direction of the main control box.

[0011] In this embodiment, by staggering the orthographic projection of the first end of the drain plate on the box cover and the orthographic projection on the battery management unit, the opening and the battery management unit are staggered in the first direction, so that the condensed water dripping from the opening can be staggered away from the battery management unit, thereby further improving the performance stability of the main control box.

[0012] In a possible implementation, an orthographic projection of the second end on the box cover is staggered from an orthographic projection of the battery management unit on the box cover.

[0013] In this embodiment, by staggering the orthographic projection of the second end on the box cover and the orthographic projection of the battery management unit on the box cover, the condensed water generated above the battery management unit is helped to avoid the battery management unit, thereby further improving the performance stability of the main control box.

[0014] In one possible implementation, the box body includes a first side wall, which is a wall of the box body closer to the opening in a first direction, and there is a gap between the opening and the first side wall; the drainage structure also includes a drainage groove, which is arranged in the gap and is connected to the opening.

[0015] In this embodiment, a drainage groove is provided in the gap, and the drainage groove is connected to the opening, so that the condensed water dripping from the opening can drip along the drainage groove into the gap between the battery management unit and the first side wall, thereby reducing the possibility of the condensed water dripping onto the battery management unit and further improving the performance stability of the main control box.

[0016] In a possible implementation, the material of the water-absorbing layer includes polyurethane waterproof coating.

[0017] In this embodiment, polyurethane waterproof coating is used as the water-absorbing layer. Since the porosity structure of polyurethane material is stable, it is basically a closed-cell structure with low thermal conductivity. When it is sprayed on the box cover, when the outside temperature is low and the internal temperature is high, the heat conduction is slow, the internal temperature drops slowly, and condensation is not easy to form. When there is very little condensation inside, it can also react with water to absorb moisture, thereby effectively reducing the probability of condensation water generation.

[0018] In a possible implementation, the material of the water-absorbing layer includes flocking material.

[0019] In this embodiment, flocking material is used as the water absorption layer, which can greatly absorb the water vapor in the main control box, thereby effectively reducing the probability of condensation water generation.

[0020] In a possible implementation, the thickness of the absorption layer is greater than or equal to 2 mm.

[0021] In this embodiment, if the thickness of the water absorption layer is set to be less than 2 mm, the moisture-proof requirement of the main control box may not be met. By setting the thickness H of the water absorption layer to be greater than or equal to 2 mm, the probability of condensation water generation can be minimized.

[0022] In a possible implementation, the thickness of the water absorbing layer is less than or equal to 5 mm.

[0023] In this embodiment, if the thickness of the water-absorbing layer is set to be greater than 5 mm, it will easily fall off and still cannot meet the moisture-proof requirements of the main control box. By setting the thickness of the water-absorbing layer to be less than or equal to 5 mm, the probability of condensation water generation can be minimized.

[0024] In a second aspect, an energy storage system is provided, comprising a battery and a main control box according to the first aspect and any possible implementation thereof.

[0025] In a third aspect, an electrical device is provided, comprising a battery and a main control box according to the first aspect and a possible implementation thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 shows a schematic block diagram of an energy storage system according to an embodiment of the present application.

[0027] FIG2 shows a first schematic cross-sectional view of the main control box according to an embodiment of the present application.

[0028] FIG3 shows a second schematic cross-sectional view of the main control box according to an embodiment of the present application.

[0029] FIG4 shows a third schematic cross-sectional view of the main control box according to an embodiment of the present application.

[0030] FIG5 shows a schematic top view of the box cover of the main control box according to an embodiment of the present application.

[0031] Explanation of the accompanying figures: 100-energy storage system; 110-battery; 120-main control box; 121-SBMU; 130-box body; 140-box cover; 150-water absorption layer; 160-control components; H-thickness of water absorption layer; 161-battery management unit; 170-drainage structure; 171-drainage plate; 172-drainage groove; 180-opening; L-gap; 131-first side wall; 1711-first end; 1712-second end. DETAILED DESCRIPTION

[0032] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0033] In the description of this application, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0034] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0036] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0037] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] The main control box is typically electrically connected to one or more batteries and is used to control and manage them. For example, it can read data such as the battery's voltage, current, and temperature during operation. Another example is controlling the battery's on / off state.

[0039] The traditional main control box does not take water vapor condensation into consideration inside the box, and only performs external sealing control, which easily produces condensation. When the condensation drips onto the core components inside the box, it may affect the performance stability of the main control box.

[0040] In view of this, an embodiment of the present application provides a main control box, which provides a water-absorbing layer on the surface of the box cover facing the box body to absorb water vapor in the main control box, reduce the probability of generating condensation water, and thus improve the performance stability of the main control box.

[0041] It should be noted that the main control box provided in the embodiment of the present application can be applied to energy storage systems as well as to electrical devices. For the sake of convenience, the following description will mainly focus on the application to energy storage systems.

[0042] FIG1 shows a schematic block diagram of an energy storage system. As shown in FIG1 , the energy storage system 100 may include a battery 110 and a main control box 120 .

[0043] Generally, an energy storage system is a device for storing energy that can accommodate one or more energy storage elements, wherein the energy storage element can be a battery. For example, as shown in FIG1 , the energy storage system 100 includes one or more batteries 110, wherein a battery 110 can also be referred to as an electrical box, which includes a box body and one or more battery cells encapsulated by the box body. The embodiments of the present application do not limit the type and shape of the battery cells. For example, the battery cells can include metal batteries, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc. For another example, the battery cells can be cylindrical, flat, rectangular or other shapes.

[0044] Optionally, as shown in Figure 1, the energy storage system 100 may further include a main control box 120, which may be a box-type structure containing control components, such as a programmable logic controller. The main control box 120 may be electrically connected to one or more batteries 110 and may also be connected to a master control system. The main control box 120 may be used to control and manage one or more batteries 110. For example, the main control box 120 may read data such as voltage, current, and temperature of the batteries 110 during operation. For another example, the main control box 120 may control the on / off status of the batteries 110.

[0045] Optionally, the main control box 120 may be provided with core components such as a slave battery management unit (SBMU) 121. The SBMU 121 can perform comprehensive monitoring and control of the battery 110 to ensure the safety, longevity, and stable performance of the battery 110.

[0046] In other embodiments, various auxiliary components such as relays, fuses, indicator lights, isolating switches, current sensors, high-voltage copper bars, and fuses may also be provided in the main control box 120 .

[0047] Optionally, other functional components may be provided in the energy storage system 100 to assist in the operation of the multiple energy storage elements. For example, a thermal management component may be provided in the energy storage system 100, including but not limited to an air conditioning component, a fan component, a water cooling pipe, etc., which may be used to thermally manage the battery 110 to adjust the internal temperature of the battery 110.

[0048] It should be understood that the energy storage system 100 of the embodiment of the present application can be applied to various scenarios such as home storage, outdoor energy storage, power grid, etc., and the embodiment of the present application is not limited to this.

[0049] Figure 2 shows a schematic cross-sectional view of a main control box according to an embodiment of the present application. As shown in Figure 2, the main control box 120 includes a box body 130 and a box cover 140. The box body 130 is a hollow structure with an opening. The box body 130 can accommodate battery control components 160. For example, the control components 160 may include the SBMU 121 shown in Figure 1. For another example, the control components 160 may also include relays, fuses, indicator lights, disconnect switches, current sensors, high-voltage copper busbars, fuses, and other components.

[0050] In some examples, the box cover 140 can be disposed above the box body 130 to cover the box body 130. For example, the box cover 140 can cover the opening of the box body 130 to form a closed receiving space. The battery control component 160 can be disposed within the receiving space.

[0051] In other examples, a water absorption layer 150 may be provided on the lower surface of the box cover 140 , and the water absorption layer 150 is used to absorb water vapor in the main control box 120 .

[0052] Optionally, the water-absorbing layer 150 is generally made of some water-absorbing materials, for example, various polymer materials such as super absorbent resin, polyurethane, polyvinyl alcohol, polypropylene, etc., or flocking materials, foam, nano-silicon dioxide, etc.

[0053] In some embodiments, the water absorbing layer 150 may be formed by spraying or other processes with the box cover 140 as the base, or may be an independent water absorbing layer 150 fixed to the lower surface of the box cover 140 by bonding or other methods.

[0054] In this embodiment, a moisture-absorbing layer 150 is provided on the lower surface of the box cover 140 to absorb moisture within the main control box 120, reducing the likelihood of condensation. This alleviates the problem of condensation dripping onto the control components 160 within the box body 130, which can lead to poor performance stability in the main control box 120. Furthermore, compared to solutions that require additional dehumidification equipment for the main control box 120, this absorbs moisture within the main control box 120 without damaging its appearance, thereby reducing energy consumption.

[0055] FIG3 shows another schematic cross-sectional view of the main control box according to an embodiment of the present application. As shown in FIG3 , the control component 160 includes a battery management unit 161 , and the orthographic projection of the water absorbing layer 150 on the box cover 140 covers the orthographic projection of the battery management unit 161 on the box cover 140 .

[0056] It should be explained that the orthographic projection of the water-absorbing layer 150 on the box cover 140 may refer to the projection of the water-absorbing layer 150 on the box cover 140 in the gravity direction G of the main control box 120; and the orthographic projection of the battery management unit 161 on the box cover 140 may refer to the projection of the water-absorbing layer 150 on the box cover 140 in the gravity direction G of the main control box 120.

[0057] In addition, the battery management unit 161 in the embodiment of the present application may be, for example, the SBMU 121 in FIG. 1 . For related descriptions, reference may be made to the above text, which will not be repeated here for the sake of brevity.

[0058] The orthographic projection of the water-absorbing layer 150 on the case cover 140 covers the orthographic projection of the battery management unit 161 on the case cover 140, which may mean that the orthographic projection of the battery management unit 161 on the case cover 140 is located above the orthographic projection of the water-absorbing layer 150 on the case cover 140. For example, the water-absorbing layer 150 may be disposed only above the battery management unit 161. For another example, the water-absorbing layer 150 may be disposed not only above the battery management unit 161 but also above other control components.

[0059] It should be noted that the water-absorbing layer 150 is disposed above the battery management unit 161. This may include the case where the orthographic projection area of ​​the water-absorbing layer 150 on the box body 130 completely overlaps with the orthographic projection area of ​​the battery management unit 161 on the box body 130. This may also include the case where the orthographic projection area of ​​the battery management unit 161 on the box body 130 is located within the orthographic projection area of ​​the water-absorbing layer 150 on the box body 130, and the orthographic projection area of ​​the water-absorbing layer 150 on the box body 130 is slightly larger than the orthographic projection area of ​​the battery management unit 161 on the box body 130. For example, the boundary of the orthographic projection area of ​​the water-absorbing layer 150 on the box body 130 may exceed the boundary of the orthographic projection area of ​​the battery management unit 161 on the box body 130 by 5 mm.

[0060] In this embodiment, by providing the orthographic projection of water-absorbing layer 150 on case cover 140 to cover the orthographic projection of battery management unit 161 on case cover 140, the probability of condensation forming above battery management unit 161 can be reduced, thereby reducing the possibility of condensation dripping onto battery management unit 161, thereby improving the performance stability of main control box 120. Furthermore, water-absorbing layer 150 can be provided only above battery management unit 161, thereby reducing the cost of main control box 120.

[0061] Figure 4 shows another schematic cross-sectional view of the main control box according to an embodiment of the present application. Figure 5 shows a schematic top view of the box cover according to an embodiment of the present application. As shown in Figure 4, the main control box 120 also includes a drainage structure 170, which is used to drain condensed water generated above the battery management unit 161 out of the battery management unit 161.

[0062] In other words, the presence of the drainage structure 170 can prevent condensed water generated above the battery management unit 161 from dripping onto the battery management unit 161 .

[0063] In this embodiment, even if the water absorption effect of the water absorption layer 150 is not good enough, resulting in condensation water being generated, by setting a drainage structure 170 in the main control box 120, the condensation water generated above the battery management unit 161 will not drip onto the battery management unit 161, thereby further improving the performance stability of the main control box 120.

[0064] In some embodiments, as shown in FIG4 , the drainage structure 170 includes a drainage plate 171 disposed below the water-absorbing layer 150 and covering at least a portion of the water-absorbing layer 150. As shown in FIG4 and FIG5 , the drainage plate 171 defines an opening 180 between a first end 1711 in a first direction X and the case cover 140. A second end 1712 in the first direction X of the drainage plate 171 is fixedly connected to the case cover 140. The orthographic projection of the first end 1711 on the case cover 140 is offset from the orthographic projection of the battery management unit 161. The first direction X is perpendicular to the direction of gravity G of the main control box 120.

[0065] Optionally, the main structure of the drain plate 171 in the embodiment of the present application is a plate-like structure, that is, the portion of the drain plate 171 covering the water absorbing layer 150 is a plate-like structure. In some embodiments, the drain plate 171 can cover the entire water absorbing layer 150. In other embodiments, the drain plate 171 can cover a portion of the water absorbing layer 150.

[0066] Optionally, as shown in FIG. 4 , a first end 1711 of the guide plate 171 in the first direction X is a free end, and a second end 1712 of the guide plate 171 in the first direction X is a fixed end.

[0067] 4 , the opening 180 formed between the first end 1711 and the box cover 140 may face the first direction X. In other embodiments, the first end 1711 may also form an opening with the sidewall of the box body 130 , and the opening may face the direction G of gravity.

[0068] Optionally, the second end 1712 and the box cover 140 can be fixedly connected by bonding, riveting, or threaded fasteners. For example, a fixing bolt can be provided on the lower surface of the box cover 140, and a mounting hole can be provided on the second end 1712. The mounting hole is inserted into the fixing bolt, and then the guide plate 171 is mounted to the lower surface of the box cover 140 by the cooperation of the nut and the bolt.

[0069] Similarly, the orthographic projection of the first end 1711 on the box cover 140 may refer to the projection of the first end 1711 on the box cover in the direction of gravity G of the main control box 120. In the embodiment of the present application, the orthographic projection of the first end 1711 on the box cover 140 is offset from the orthographic projection on the battery management unit 161. This can be understood as the fact that, in the first direction X, the opening 180 and the battery management unit 161 are offset.

[0070] It should be noted that the first direction X may be the length direction of the box cover 140 or the width direction of the box cover 140 .

[0071] Due to gravity, the condensed water generated on the box cover 140 above the battery management unit 161 will drip vertically onto the battery management unit 161. In the embodiment of the present application, by staggering the orthographic projection of the first end 1711 of the drain plate 171 on the box cover 140 and the orthographic projection on the battery management unit 161, the opening 180 and the battery management unit 161 are staggered in the first direction X, so that the condensed water dripping from the opening 180 can be staggered away from the battery management unit 161, thereby further improving the performance stability of the main control box 120.

[0072] Further referring to FIG. 4 and FIG. 5 , the orthographic projection of the second end 1712 on the box cover 140 is staggered from the orthographic projection of the battery management unit 161 on the box cover 140 .

[0073] For example, the water absorption layer 150 is only provided above the battery management unit 161 , and then in the first direction X, the guide plate 171 may cover the entire water absorption layer 150 .

[0074] For another example, the water absorption layer 150 is not only arranged above the battery management unit 161, but also arranged on other control components in the main control box 120. Then in the first direction X, the drainage plate 171 can cover the entire water absorption layer 150, or only cover the water absorption layer 150 located above the battery management unit 161.

[0075] In this embodiment, by staggering the orthographic projection of the second end 1712 on the box cover 140 and the orthographic projection of the battery management unit 161 on the box cover 140, the condensed water generated above the battery management unit 161 can avoid the battery management unit 161, thereby further improving the performance stability of the main control box 120.

[0076] Optionally, as shown in Figure 4, the box body 130 may include a first side wall 131, which is a wall of the box body 130 closer to the opening 180 in the first direction X, and there is a gap L between the opening 180 and the first side wall 131, wherein the drainage structure 170 also includes a drainage groove 172, which is arranged in the gap L, and the drainage groove 172 is connected to the opening 180.

[0077] Typically, the battery management unit 161 is disposed on the box body 130 near the first side wall 131 of the box body 130 in the first direction X. In other words, there is a certain gap between the battery management unit 161 and the first side wall 131. As long as condensed water drips within this gap, it will not drip onto the battery management unit 161.

[0078] In some embodiments, the first end 1711 of the guide plate 171 may not be in contact with the first side wall 131, but may be at a certain distance from the first side wall 131, so that there is a gap L between the opening 180 and the first side wall 131. Optionally, the gap L between the opening 180 and the first side wall 131 should be smaller than the gap between the battery management unit 161 and the first side wall 131, thereby ensuring that the condensed water dripping from the opening 180 will not drip onto the battery management unit 161.

[0079] In this embodiment, a drainage groove 172 is provided in the gap L, and the drainage groove 172 is connected to the opening 180, so that the condensed water dripping from the opening 180 can drip along the drainage groove 172 into the gap between the battery management unit 161 and the first side wall 131, thereby reducing the possibility of the condensed water dripping onto the battery management unit 161, and further improving the performance stability of the main control box 120.

[0080] In some embodiments, the drainage groove 172 can be formed by disposing another drainage plate between the battery management unit 161 and the first side wall 131, with the drainage groove 172 formed between the other drainage plate and the first side wall 131. In other embodiments, an independent component can be disposed between the first side wall 131 and the battery management unit 161, with the component provided with a through hole extending in the direction of gravity G, forming the drainage groove 172. It should be understood that the embodiments of the present application do not limit the implementation of the drainage groove 172.

[0081] Optionally, in the embodiment of the present application, the drainage structure 170 may be made of an insulating material, for example, PP material.

[0082] Optionally, in one embodiment, the material of the water-absorbing layer 150 includes polyurethane waterproof coating.

[0083] Polyurethane waterproof coatings are single-component polyurethane waterproof coatings made by mixing and processing isocyanate prepolymers, which are formed by the polymerization reaction of isocyanates and polyethers. These are combined with catalysts, anhydrous additives, anhydrous fillers, and solvents. These coatings are reaction-curing (moisture-curing) and feature high strength, high elongation, and excellent water resistance. They cure upon contact with moisture in the air, forming a solid, seamless, and integral waterproof membrane on the surface of the base layer.

[0084] The chemical formula for polyurethane and water foaming is: -NCO+H2O→-NH2+CO2↑.

[0085] Among them, -NCO is an isocyanate group; H2O is the chemical formula of water; -NH2 is an amino group; CO2 is the chemical formula of carbon dioxide.

[0086] In this embodiment, polyurethane waterproof coating is used as the water-absorbing layer 150. Since the porosity structure of the polyurethane material is stable, it is basically a closed-cell structure with low thermal conductivity. When it is sprayed on the box cover 140, when the external temperature is low and the internal temperature is high, the heat conduction is slow, the internal temperature drops slowly, and condensation is not easy to form. When very little condensation appears inside, it can also react with water to absorb moisture, thereby effectively reducing the probability of condensation water generation.

[0087] Alternatively, in another embodiment, the material of the water-absorbing layer 150 includes flocking material. For example, the material of the water-absorbing layer 150 includes cotton flocking, polyester flocking, acrylic flocking, wool, acrylic, or spandex.

[0088] In this embodiment, flocking material is used as the water absorption layer 150, which can greatly absorb the water vapor in the main control box 120, thereby effectively reducing the probability of condensation water generation.

[0089] In other embodiments, the material of the water absorbing layer 150 may also include foam, nano-silicon dioxide and other materials.

[0090] Optionally, as shown in FIG3 , the thickness of the water absorbing layer 150 is H, and H may be greater than or equal to 2 mm.

[0091] In this embodiment, if the thickness of the water absorption layer 150 is set to be less than 2 mm, the moisture-proof requirements of the main control box 120 may not be met. By setting the thickness H of the water absorption layer 150 to be greater than or equal to 2 mm, the probability of condensation water generation can be minimized.

[0092] Optionally, in the embodiment of the present application, H may be less than or equal to 5 mm.

[0093] In this embodiment, if the thickness of the water absorption layer 150 is set to be greater than 5 mm, it is easy to fall off and still cannot meet the moisture-proof requirements of the main control box 120. By setting the thickness of the water absorption layer 150 to be less than or equal to 5 mm, the probability of condensation water generation can be minimized.

[0094] Alternatively, H may be equal to 2 mm, 3 mm, 4 mm or 5 mm.

[0095] Referring again to Figures 2 to 5 , an embodiment of the present application provides a main control box 120 comprising a box body 130 housing a battery control component 160; a box cover 140 disposed above the box body 130 and covering the box body 130; a water-absorbing layer 150 is sprayed on the lower surface of the box cover 140. The water-absorbing layer 150 is made of a polyurethane waterproof coating and is used to absorb moisture within the main control box 120. The control component 160 includes a battery management unit 161, and the orthographic projection of the water-absorbing layer 150 on the box cover 140 covers the orthographic projection of the battery management unit 161 on the box cover 140. A drainage plate 171 is provided below the water absorbing layer 150. The drainage plate 171 covers at least a portion of the water absorbing layer 150. An opening 180 is formed between a first end 1711 of the drainage plate 171 in the first direction X and the box cover 140. A second end 1712 of the drainage plate 171 in the first direction X is fixedly connected to the box cover 140. The orthographic projection of the first end 1711 on the box cover 140 is staggered from the orthographic projection of the battery management unit 161 on the box cover 140, and the second end 1712 is fixedly connected to the box cover 140. The orthographic projection of the battery management unit 161 on the box cover 140 is offset from the orthographic projection of the battery management unit 161 on the box cover 140. The first direction X is perpendicular to the direction of gravity G of the main control box 120. The box body 130 includes a first side wall 131, which is the wall of the box body 130 closer to the opening 180 in the first direction X. A gap L is defined between the opening 180 and the first side wall 131. A drainage groove 172 is disposed within the gap L and communicates with the opening 180. The thickness H of the water-absorbing layer 150 satisfies the following conditions: 2 mm ≤ H ≤ 5 mm.

[0096] In this embodiment, a polyurethane waterproof coating is used as the water-absorbing layer 150. Since the porosity structure of the polyurethane material is stable, it is basically a closed-cell structure with low thermal conductivity. When it is sprayed on the box cover 140, when the external temperature is low and the internal temperature is high, the heat conduction is slow, the internal temperature drops slowly, and condensation is not easy to form. When there is very little condensation inside, it can also react with water to absorb moisture, thereby effectively reducing the probability of condensation. In addition, by providing a drainage plate 171 and a drainage groove 172 in the main control box 120, even if condensation is generated above the battery management unit 161, it will not drip onto the battery management unit 161, thereby further improving the performance stability of the main control box 120. By setting the thickness H of the water-absorbing layer 150 to be greater than or equal to 2 mm and less than or equal to 5 mm, the probability of condensation can be minimized.

[0097] Testing was conducted on control box 1#, whose lower cover was coated with polyurethane, and control box 2#, which lacked a water-absorbing layer. Specifically, at both room temperature (25°C) and high temperature (55°C), control boxes 1# and 2# were subjected to full-power charge and discharge at 0.5P. It was clearly observed that the overall temperature of control box 1# was 2-3°C higher than that of control box 2#. This indicates that both the internal and ambient temperatures of control box 1#, which was coated with polyurethane, were within normal operating conditions, demonstrating no impact on its performance.

[0098] Tests were conducted on control box 3#, whose lower cover was sprayed with polyurethane; control box 4#, whose lower cover was coated with flocking material; and control box 5#, whose lower cover had no water-absorbing layer. Specifically, during the test bench construction phase: 1. The three test control boxes were numbered 3#, 4#, and 5#, and their covers were treated as described above. 2. After the control boxes were treated, photos were taken and the covers were tightened according to the corresponding torque. 3. External high and low voltages were connected to ensure that the control box test environment was consistent with the actual container. 4. The control boxes had built-in temperature sensors to monitor the internal ambient temperature. 5. The three control boxes were connected in series to a DC power source. During the pre-test inspection phase: 1. Insulation resistance was tested (1000VDC, 60s, rise and fall times of 10s, R ≥ 20MΩ); 2. Withstand voltage leakage current was tested (4200VDC, 60s, rise and fall times of 10s, I ≤ 1mA). Test phase (3#, 4#, and 5# main control box covers closed - charge and discharge test): 1. Open the incubator, wait for 1 hour after the actual incubator temperature and humidity reach 55±2°C, 95±2% RH; 2. Apply a 140A overcurrent for 4 hours; 3. Allow to stand for 4 hours; 4. Apply a 140A overcurrent for 4 hours; 5. Allow to stand for 4 hours; 6. Repeat cycles 2-5 for a total of 5 days, opening the incubator every 24 hours for an insulation withstand voltage test. Repeat three sets of tests, followed by a post-test inspection.

[0099] By comparing the main control boxes 3#, 4# and 5#, it was found that the main control box 3# sprayed with polyurethane had the least amount of condensed water, followed by the main control box 4# coated with flocking material, and the main control box 5# without any treatment on the box cover had the most condensed water.

[0100] An embodiment of the present application further provides an energy storage system, including a battery and the main control box 120 in the various embodiments described above.

[0101] An embodiment of the present application further provides an electrical device, including a battery and the main control box 120 in the various embodiments described above.

[0102] The power-consuming device can be a vehicle or any device that uses a battery.

[0103] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A main control box, characterized in that: include: The box body contains the control components of the battery; A box cover, arranged above the box body, covering the box body; Wherein, a water absorbing layer is provided on the lower surface of the box cover, and the water absorbing layer is used to absorb water vapor in the main control box; The control component comprises a battery management unit, and the orthographic projection of the water absorbing layer on the box cover covers the orthographic projection of the battery management unit on the box cover.

2. The main control box according to claim 1, characterized in that: The main control box also includes a drainage structure, which is used to drain condensed water generated above the battery management unit to the outside of the battery management unit.

3. The main control box according to claim 2, characterized in that: The drainage structure comprises a drainage plate, the drainage plate is arranged below the water absorption layer, and the drainage plate covers at least a part of the water absorption layer; An opening is formed between the first end of the guide plate in the first direction and the box cover, and the second end of the guide plate in the first direction is fixedly connected to the box cover; The orthographic projection of the first end on the box cover is staggered from the orthographic projection of the battery management unit on the box cover, and the first direction is perpendicular to the gravity direction of the main control box.

4. The main control box according to claim 3, characterized in that: The orthographic projection of the second end on the box cover is staggered from the orthographic projection of the battery management unit on the box cover.

5. The main control box according to claim 3 or 4, characterized in that: The box body comprises a first side wall, the first side wall being a wall of the box body closer to the opening in the first direction, and a gap being provided between the opening and the first side wall; The drainage structure further includes a drainage groove, which is arranged in the gap and communicated with the opening.

6. The main control box according to any one of claims 1 to 5, characterized in that: The material of the water absorbing layer includes polyurethane waterproof coating.

7. The main control box according to any one of claims 1 to 5, characterized in that: The material of the water absorbing layer includes flocking material.

8. The main control box according to any one of claims 1 to 7, characterized in that: The thickness of the water absorbing layer is greater than or equal to 2 mm.

9. The main control box according to any one of claims 1 to 8, characterized in that: The thickness of the water absorbing layer is less than or equal to 5 mm.

10. An energy storage system, characterized in that: The invention comprises a battery and a main control box as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: The invention comprises a battery and a main control box as claimed in any one of claims 1 to 9.

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