Battery pack and electric equipment
By setting a super-hydrophobic layer above the electrical components, the problem of water dripping caused by condensation in the battery pack is solved, and the safety of the battery pack is improved.
Patent Information
- Application Number
- CN202422571260.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-10-23
AI Technical Summary
Water droplets caused by condensation on the battery pack may corrode or short-circuit electrical components, posing a safety hazard.
A super-hydrophobic layer is set directly above the electrical device. The super-hydrophobic layer material has a water contact angle greater than 150° and a rolling angle less than 10°, preventing water droplets from condensing or dripping on the electrical device.
Effectively prevent water droplets from dripping onto electrical components, reduce potential safety hazards of the battery pack, and improve the safety performance of the battery pack.
Smart Images
Figure CN223436599U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of energy storage, and in particular to a battery pack and an electric device. BACKGROUND
[0002] With the rapid development of new energy technology, the battery pack as the core energy storage component in this technical field plays a key role. The safety performance of the battery pack has always been a focus of attention, and the safety protection requirements for the battery pack are becoming higher and higher.
[0003] Among them, the battery pack will condense water droplets in the inside of the battery pack due to the influence of the use environment and other factors. The condensation of water droplets will affect the overall electrical safety of the battery pack and cause the structural safety and reliability to be reduced, thereby producing a safety hazard. CONTENT OF THE UTILITY MODEL
[0004] The present application provides a battery pack and an electric device in order to reduce the influence of condensation on the safety performance of the battery pack and improve the safety performance of the battery pack.
[0005] In a first aspect, the present application provides a battery pack having a first direction, comprising a box body having an open accommodating cavity; a cover body which is provided on the open side in the first direction to close the accommodating cavity; an electrical device and a super-hydrophobic layer, both of which are arranged in the accommodating cavity, and the super-hydrophobic layer is located on the side of the electrical device facing the cover body; wherein, in the first direction, the box body has a first wall surface opposite to the cover body, and the electrical device is arranged on the first wall surface; the orthogonal projection of the super-hydrophobic layer on the first wall surface at least partially overlaps the orthogonal projection of the electrical device on the first wall surface.
[0006] To achieve the above technical solution, the most direct influence of condensation on the safety performance of the battery pack is that the condensed water droplets may fall on the electrical device, thereby causing corrosion, short circuit and other influences of the electrical device, thereby producing a safety hazard. Therefore, in the present application, the super-hydrophobic layer is at least partially arranged above the electrical device in the first direction. The super-hydrophobic layer is a layer structure formed by coating a new type of material with special surface properties on the surface of a solid structure, and its characteristics are that the water contact angle is greater than 150°, and the rolling angle is less than 10°, which makes the super-hydrophobic layer have extremely high hydrophobic performance, so that water droplets cannot adhere to its surface. Arranging the super-hydrophobic layer above the electrical device in the first direction has the following two technical advantages: first, it avoids the condensation of water vapor above the electrical device in the first direction, thereby avoiding the condensation of water droplets in this area falling on the electrical device; second, the water flow condensed by the condensation in other areas not coated with the super-hydrophobic layer will drip at the edge position when passing through the super-hydrophobic layer, thereby avoiding dripping on the electrical device in the first direction. In summary, the condensed water droplets are prevented from dripping on the electrical device, thereby avoiding the influence of short circuit and corrosion on the electrical device, so as to improve the safety of the battery pack.
[0007] As one of the optional embodiments of the present application, the cover has a second wall surface facing the first wall surface, and the super-hydrophobic layer is disposed on the second wall surface.
[0008] As one of the optional embodiments of the present application, in the first direction, the orthographic projection of the super-hydrophobic layer on the first wall surface coincides with the orthographic projection of the electrical device on the first wall surface.
[0009] To implement the above technical solution, when the super-hydrophobic layer is arranged on the second wall surface, the arrangement of the super-hydrophobic layer is more flexible. Therefore, the coverage of the super-hydrophobic layer can be further refined in this solution to overlap with the electrical components to achieve comprehensive anti-drip protection for the electrical components.
[0010] As one of the optional embodiments of the present application, the second wall surface includes multiple parallel surfaces, which are arranged parallel to the first wall surface; wherein, the superhydrophobic layer is arranged on the parallel surfaces, and in the first direction, the orthographic projection of the superhydrophobic layer on the first wall surface is within the area defined by the orthographic projection of the electrical device on the first wall surface.
[0011] To implement the above technical solution, since water droplets generated by condensation on parallel surfaces are difficult to flow out actively, they usually drip along the first direction when they accumulate to a certain amount. Therefore, if the area of the second wall directly above the electrical device in the first direction is a parallel surface, all parallel surfaces are coated with a super-hydrophobic layer to avoid the situation where condensation has nowhere to flow and drips onto the electrical device.
[0012] As one of the optional embodiments of the present application, the second wall surface includes multiple step surfaces, which are inclined compared to the first wall surface. The step surfaces have a starting side and an ending side, and the step surfaces are gradually arranged close to the first wall surface from the starting side to the ending side; wherein, in the first direction, the projection of the ending side on the first wall surface is located within the area defined by the projection of the electrical device on the first wall surface, and the superhydrophobic layer is arranged on the step surface.
[0013] To implement the above technical solution, since the drop surface is inclined compared to the first wall surface, that is, different areas of the drop surface have a height difference in the first direction, if condensation occurs on the drop surface or dew in other areas flows through the drop surface, the water flow will have a tendency to flow. Since the terminal side of the drop surface is directly above the electrical device, water can easily drip from the terminal side, causing the water to drip directly onto the electrical device. Therefore, for the drop surface, since the terminal side of the drop surface is directly above the electrical device, this type of drop surface needs to be coated with a superhydrophobic layer to prevent water from converging and dripping.
[0014] As one of the optional embodiments of the present application, it also includes a first wiring harness arranged in the accommodating cavity. In the first direction, the first wiring harness is located on the side of the electrical device facing the cover body, and the super-hydrophobic layer is arranged on the outer side of the first wiring harness.
[0015] As one of the optional embodiments of the present application, the first wire harness comprises a first segment and a second segment connected to each other, the first segment has a front end close to the second segment and a rear end away from the second segment, and the first segment is gradually arranged close to the first wall surface from the rear end to the front end; wherein the first segment has a tangent line at the front end, along the extension direction of the tangent line, the second segment and the first segment are located on the same side of the tangent line, and the super-hydrophobic layer is arranged on the outer side wall of the first segment.
[0016] The first wire harness is above the electrical device, and the condensed water on the first wire harness may also drip onto the electrical device, so the super-hydrophobic layer arranged on the outer side of the first wire harness can also reduce the influence of water dripping on the electrical device, especially for the wire harness with height difference in the first direction, the second segment and the first segment are located on the same side of the tangent line at the connection position, that is, the first wire harness is turned at this position, which is easy to cause water dripping, so the first wire harness is mainly coated.
[0017] As one of the optional embodiments of the present application, the electrical device comprises at least one of a part of an external interface located in the box, a single battery and a battery management module, wherein the external interface is used for plugging and electrically connecting with external loads.
[0018] As one of the optional embodiments of the present application, the battery management module comprises a containing box and an electrical connector electrically connected with the containing box, and the electrical connector comprises at least one of a connecting wire harness and a metal wiring panel.
[0019] On the other hand, the present application provides a power utilization equipment comprising the above-mentioned battery pack.
[0020] One of the above technical solutions has the following advantages or beneficial effects:
[0021] The most direct influence of condensation on the safety performance of the battery pack is that the condensed water droplets may drip onto the electrical device, thereby causing short circuit, corrosion and other influences of the electrical device, thereby producing safety hazards. Therefore, in the present application, a super-hydrophobic layer is at least partially arranged above the electrical device in the first direction. The super-hydrophobic layer is a layer structure formed by coating a new type of material with special surface properties on the surface of a solid structure, which has a water contact angle greater than 150° and a rolling angle less than 10°, which makes the super-hydrophobic layer have extremely high hydrophobicity, so that water droplets cannot adhere to its surface. Arranging the super-hydrophobic layer above the electrical device in the first direction has the following two technical advantages: first, it avoids condensation of water vapor above the electrical device in the first direction, thereby avoiding the condensation of water droplets in this area and dripping onto the electrical device; second, the water flow condensed in other areas not coated with the super-hydrophobic layer will drip at the edge position when passing through the super-hydrophobic layer, thereby avoiding dripping onto the electrical device in the first direction. In summary, the condensed water droplets are prevented from dripping onto the electrical device, thereby avoiding the influence of short circuit and corrosion on the electrical device, so as to improve the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.
[0023] Figure 1 This is a diagram of the overall structure of the battery pack provided in an embodiment of the present application;
[0024] Figure 2 This is an exploded structural diagram of a battery pack provided in an embodiment of the present application;
[0025] Figure 3 Schematic diagram for illustrating the coating position of the super-hydrophobic layer provided in an embodiment of the present application;
[0026] Figure 4 Schematic diagram of the embodiment of the present application for showing the coating of super-hydrophobic layer on the stepped surface and parallel surface;
[0027] Figure 5 This embodiment of the present application provides Figure 4 A partial enlarged view of part A;
[0028] Figure 6 is a schematic diagram provided in an embodiment of the present application for illustrating that a super-hydrophobic layer is coated on a first wiring harness;
[0029] Figure 7 Schematic diagram of the coating position of the super-hydrophobic layer in other embodiments provided in this application.
[0030] Reference numerals: 10, box body; 101, accommodating cavity; 100, cover body; 11, first wall surface; 12, second wall surface;
[0031] 121, parallel surface; 122, drop surface; 1221, starting side; 1222, ending side;
[0032] 2. Electrical components; 21. Single battery; 22. Battery management module; 221. Housing; 222. Electrical connector; 23. External interface;
[0033] 3. Super hydrophobic layer;
[0034] 4. First wiring harness; 41. First section; 411. Front end; 412. Rear end; 42. Second section;
[0035] Z, first direction; T, tangent. DETAILED DESCRIPTION
[0036] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.
[0037] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects without special description.
[0038] The following will be described in detail with reference to the drawings of the embodiments of the present application. Figures 1-7 The present application will be further described.
[0039] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application. Figure 1 And Figure 2 A battery pack provided by the present application has a first direction Z, which is parallel to the direction of gravity. The battery pack comprises a box body 10 and a cover body 100, wherein the box body 10 has a containing cavity 101 which is open along the first direction Z, and the cover body 100 is arranged along the first direction Z to close the containing cavity 101.
[0040] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application. Figure 2 And Figure 3 The battery pack further comprises an electrical device 2 and a super-hydrophobic layer 3, both of which are arranged in the containing cavity 101. Specifically, in the first direction Z, the box body 10 has a first wall surface 11 opposite to the cover body 100, the electrical device 2 is arranged on the first wall surface 11, and the super-hydrophobic layer 3 is located on the side of the electrical device 2 facing the cover body 100. The orthogonal projection of the super-hydrophobic layer 3 on the first wall surface 11 at least partially overlaps the orthogonal projection of the electrical device 2 on the first wall surface 11.
[0041] It should be noted that, in the embodiments of the present application, the first wall surface 11 is the bottommost surface of the box body 10 in the first direction Z, but in other optional examples, the first wall surface 11 can also be a plurality of spaced surfaces in the first direction Z, as long as the surfaces in the containing cavity 101 that can be used to support the electrical device 2 can be called the first wall surface 11.
[0042] The most direct influence of condensation on the safety performance of the battery pack is that the condensed water droplets may drop onto the electrical device 2, causing corrosion, short circuit and other conditions of the electrical device 2, thereby producing a safety hazard. Therefore, in the scheme of the present application, a super-hydrophobic layer 3 is arranged on the entity structure at the position directly above the electrical device 2 in the first direction Z. The super-hydrophobic layer 3 is a layer structure formed by coating a new type of material with special surface properties on the surface of the entity structure, and its characteristics are that the water contact angle is greater than 150°, and the rolling angle is less than 10°. The contact angle is the angle between the tangent T of the liquid surface and the solid surface, and the critical angle at which the liquid droplet begins to roll is defined as the rolling angle. This makes the super-hydrophobic layer 3 have extremely high hydrophobicity, so that water droplets cannot adhere to its surface. Therefore, arranging the super-hydrophobic layer 3 above the electrical device 2 in the first direction Z has the following two technical advantages: first, it avoids condensation of water vapor directly above the electrical device 2 in the first direction Z, thereby avoiding condensation of water droplets onto the electrical device 2 in this area; second, the water flow condensed in other areas not coated with the super-hydrophobic layer 3 will drip at the edge position when passing through the super-hydrophobic layer 3, thereby avoiding dripping onto the electrical device 2 directly above in the first direction Z. In summary, the condensation of water droplets is avoided from dripping onto the electrical device 2, thereby avoiding adverse effects such as corrosion or short circuit of the electrical device 2, so as to improve the safety of the battery pack.
[0043] It should be noted that the super-hydrophobic layer 3 is usually made of a polymer material, and in one optional example, a fluorocarbon polymer is used, and optionally, a silane-based material. The manufacturing process of the super-hydrophobic coating includes substrate surface pretreatment, coating of coating material, curing and other steps. The substrate surface pretreatment mainly removes surface contaminants and fine abrasions through mechanical polishing, chemical treatment and other methods, improves the surface roughness and chemical reactivity, and provides better conditions for subsequent coating. Optionally, the coating methods include spraying, dipping, brushing and other methods.
[0044] Referring to Figure 2 and Figure 4 , as one of the optional embodiments of the present application, the electrical device 2 includes at least one of a single battery 21, a battery management module 22 and an external interface 23, wherein the external interface 23 is used for plugging and electrically connecting with external loads. In one optional example, the electrical device 2 includes a single battery 21, a battery management module 22 and an external interface 23.
[0045] Specifically, the battery management module 22 (Battery Management System, BMS for short) refers to a system for monitoring, controlling and protecting the battery pack, which integrates functions such as battery monitoring, charge and discharge control, temperature management, fault diagnosis and protection. The battery management module 22 includes a containing box 221 and an electrical connector 222 electrically connected to the containing box 221. The containing box 221 is internally used to install the parts of the battery management system such as the main control board, auxiliary power supply, connector and internal circuit. The electrical connector 222 is mainly used for electrical connection with the interface on the containing box 221 to realize electrical signal or current conduction. Specifically, the electrical connector 222 includes at least one of a wire harness and a metal wiring panel.
[0046] It should be noted that the battery management module 22 has many units, such as a control unit (Control Unit), a battery protection unit (Battery Protection Unit, BPU), a battery drive unit (Battery Drive Unit, BDU), etc. The integration degree of the battery management system is different according to the specific needs in different battery packs. For example, in the battery management module 22 of the embodiment of the application, the battery drive unit (Battery Drive Unit, BDU) is separated into two parts with other units, and each part is provided with a containing box 221 and an electrical connector 222. Therefore, it can be understood that the containing box 221 referred to in the application is the housing part of all sub-units belonging to the battery management module 22, and the electrical connector 222 refers to all devices that electrically connect the sub-units of the battery management module 22 with the outside or the inside.
[0047] With reference to Figure 3 As an optional embodiment of the application, the cover body 100 has a second wall surface 12 facing the first wall surface 11, and the super-hydrophobic layer 3 is arranged on the second wall surface 12. In the battery pack of the embodiment of the application, the condensation occurs mainly on the second wall surface 12, and the second wall surface 12 is arranged to face the electrical device 2 in the first direction Z. Therefore, arranging the super-hydrophobic layer 3 on the second wall surface 12 can effectively reduce the condensation on the second wall surface 12, thereby avoiding most of the dew from falling on the electrical device 2.
[0048] With reference to Figure 4 Specifically, in the first direction Z, the orthogonal projection of the super-hydrophobic layer 3 on the first wall surface 11 coincides with the orthogonal projection of the electrical device 2 on the first wall surface 11. The coverage range of the super-hydrophobic layer 3 is further refined to coincide with the electrical device 2, so as to achieve comprehensive protection against dripping for the electrical device 2, and also to save materials to a certain extent.
[0049] The following describes in detail the case where the super-hydrophobic layer 3 is arranged on the second wall surface 12.
[0050] With reference to Figure 3 and Figure 5 , as one of the optional embodiments of the present application, the second wall surface 12 includes a plurality of parallel surfaces 121 and a plurality of inclined surfaces, which in turn include the drop surfaces 122. Among them, the parallel surface 121 refers to all the planes parallel to the first wall surface 11, and the inclined surface refers to all the surfaces inclined to the first wall surface 11. Considering the factors such as saving materials and protecting the economy of the electrical appliance 2, the present embodiment makes more detailed design when the super-hydrophobic layer 3 is arranged on the second wall surface 12.
[0051] In one example, the super-hydrophobic layer 3 is arranged on the parallel surface 121, and in the first direction Z, the orthographic projection of the super-hydrophobic layer 3 on the first wall surface 11 is within the area defined by the orthographic projection of the electrical appliance 2 on the first wall surface 11.
[0052] Since the water droplets generated by condensation on the parallel surface 121 are difficult to flow out actively, they will usually accumulate to a certain amount and then drip along the first direction Z. Therefore, if the area of the second wall surface 12 directly above the electrical appliance 2 in the first direction Z is a parallel surface 121, it is necessary to coat the corresponding parallel surface 121 with the super-hydrophobic layer 3 to avoid the situation that the condensation has nowhere to flow and drips onto the electrical appliance 2.
[0053] It can be understood that the super-hydrophobic layer 3 is not arranged on every parallel surface 121, because the parallel surface 121 may only have a local area in the first direction Z relative to the electrical appliance 2, that is, the projection of the parallel surface 121 on the first wall surface 11 partially overlaps the projection of the electrical appliance 2 on the first wall surface 11. At this time, only the overlapping area of the parallel surface 121 needs to be covered with the super-hydrophobic layer 3, which can greatly save materials and reduce costs while reducing the impact of condensation. For example Figure 7 Some of the parallel surfaces 121 are not covered with the super-hydrophobic layer 3.
[0054] With reference to Figure 3 and Figure 5 , in one example, the second wall surface 12 includes a plurality of drop surfaces 122, the drop surface 122 has a starting side 1221 and a terminal side 1222, and the drop surface 122 is gradually arranged closer to the first wall surface 11 from the starting side 1221 to the terminal side 1222; wherein in the first direction Z, the projection of the terminal side 1222 on the first wall surface 11 is within the area defined by the projection of the electrical appliance 2 on the first wall surface 11, and the super-hydrophobic layer 3 is arranged on the drop surface 122.
[0055] It should be noted that the falling surface 122 is not equivalent to the inclined surface, the inclined surface includes the falling surface 122, and the inclined surface refers to the surface inclined relative to the first wall surface 11, while the falling surface 122 not only satisfies the inclination relative to the first wall surface 11, but also satisfies that the projection of the terminal side 1222 on the first wall surface 11 is located in the area defined by the projection of the electrical device 2 on the first wall surface 11.
[0056] Since the falling surface 122 is inclined relative to the first wall surface 11, that is, different regions of the falling surface 122 have height differences in the first direction Z, if the falling surface 122 is dewed or the dew of other regions flows to the falling surface 122, there will be a tendency to flow along the inclined direction on the falling surface 122. Since the terminal side 1222 of the falling surface 122 is directly above the electrical device 2, the water flow is easy to drip from the terminal side 1222, which will cause the water flow to directly drip onto the electrical device 2. Therefore, for the falling surface 122, it is necessary to coat the super-hydrophobic layer 3 on the entire falling surface 122 to avoid water flow accumulation and dripping.
[0057] Specifically, it can be referred to Figure 7 that the inclined surface in the M region does not need to be coated with the super-hydrophobic layer 3, because the terminal side 1222 of the inclined surface in the M region is not directly above the electrical device 2, and even if the inclined surface in the M region is dewed, it will not flow to the electrical device 2. However, it is necessary to cover the super-hydrophobic layer 3 on the inclined surface of the N region, that is, the falling surface 122, to avoid the water droplets generated by dew from dripping to the lowest point and falling onto the electrical device 2.
[0058] Since the entity structure above the electrical device 2 not only has the second wall surface 12, but also can have other entity structures, for example, in the embodiment of the present application, the first wire harness 4 is also arranged in the accommodating cavity 101. The case where the super-hydrophobic layer 3 is arranged on the first wire harness 4 will be described in detail below.
[0059] As one of the optional embodiments of the present application, the battery pack further comprises a first wire harness 4 arranged in the accommodating cavity 101, and in the first direction Z, the first wire harness 4 is located on the side of the electrical device 2 facing the cover 100, and the super-hydrophobic layer 3 is arranged on the outer side surface of the first wire harness 4.
[0060] Referring to Figure 6 , more specifically, the first wire harness 4 comprises a first segment 41 and a second segment 42 connected to each other, the first segment 41 has a front end 411 close to the second segment 42 and a rear end 412 away from the second segment 42, and in the first direction Z, the first segment 41 is gradually arranged close to the first wall surface 11 from the rear end 412 to the front end 411; wherein the first segment 41 has a tangent T at the front end 411, along the extension direction of the tangent T, the second segment 42 and the first segment 41 are located on the same side of the tangent T, and the super-hydrophobic layer 3 is arranged on the outer side wall of the first segment 41.
[0061] The first wire harness 4 is above the electrical device 2, and water droplets on the first wire harness 4 can also drip onto the electrical device 2, so the super-hydrophobic layer 3 arranged on the outer side of the first wire harness 4 can also reduce the influence of water droplets on the electrical device 2, especially for the wire harness with a height difference in the first direction Z, at the connection position, the first section 41 and the second section 42 are both located on the same side of the tangent T, which represents that the first wire harness 4 is bent at the position, and the trend of the bending is that the inclination angle increases from small to large, the change of the structure makes the support area of the water droplets small at the position, and the water droplets are easy to lose balance, so this can cause the water flow to be more likely to drip at the position, and the first wire harness 4 is coated.
[0062] In another aspect, the application provides a power utilization device including the battery pack.
[0063] The above is only part of the embodiments of the application, and does not limit the application in any form. The protection scope of the embodiments of the application is not limited thereto, and any person skilled in the art can easily think of simple modifications, equivalent changes and modifications within the technical scope disclosed by the embodiments of the application.
Claims
1. A battery pack having a first direction (Z), characterized in that: include: The box body (10) has an open accommodating cavity (101); A cover (100) is provided on the opening along the first direction (Z) to close the accommodating cavity (101); The electrical device (2) and the super-hydrophobic layer (3) are both arranged in the accommodating cavity (101), and the super-hydrophobic layer (3) is located on the side of the electrical device (2) facing the cover (100); Wherein, in the first direction (Z), the box body (10) has a first wall surface (11) opposite to the cover body (100), and the electrical device (2) is arranged on the first wall surface (11); the orthographic projection of the superhydrophobic layer (3) on the first wall surface (11) and the orthographic projection of the electrical device (2) on the first wall surface (11) at least partially overlap.
2. The battery pack according to claim 1, wherein: The cover (100) has a second wall surface (12) facing the first wall surface (11), and the super-hydrophobic layer (3) is arranged on the second wall surface (12).
3. The battery pack according to claim 2, wherein: In the first direction (Z), the orthographic projection of the super-hydrophobic layer (3) on the first wall surface (11) coincides with the orthographic projection of the electrical device (2) on the first wall surface (11).
4. The battery pack according to claim 2, wherein: The second wall surface (12) includes a plurality of parallel surfaces (121), and the parallel surfaces (121) and the first wall surface (11) are arranged parallel to each other; The super-hydrophobic layer (3) is arranged on the parallel surface (121), and in the first direction (Z), the orthographic projection of the super-hydrophobic layer (3) on the first wall surface (11) is within the area defined by the orthographic projection of the electrical device (2) on the first wall surface (11).
5. The battery pack according to claim 3, wherein: The second wall surface (12) includes a plurality of drop surfaces (122), the drop surfaces (122) are arranged at an inclination relative to the first wall surface (11), the drop surfaces (122) have a starting side (1221) and an ending side (1222), and the drop surfaces (122) are arranged gradually closer to the first wall surface (11) from the starting side (1221) to the ending side (1222); Wherein, in the first direction (Z), the projection of the termination side (1222) on the first wall surface (11) is located within the area defined by the projection of the electrical device (2) on the first wall surface (11), and the super-hydrophobic layer (3) is arranged on the step surface (122).
6. The battery pack according to claim 1, wherein: The invention also includes a first wiring harness (4) arranged in the accommodating cavity (101); in the first direction (Z), the first wiring harness (4) is located on the side of the electrical device (2) facing the cover body (100); and the super-hydrophobic layer (3) is arranged on the outer side of the first wiring harness (4).
7. The battery pack according to claim 6, wherein: The first wire harness (4) comprises a first section (41) and a second section (42) connected to each other, the first section (41) having a front end (411) close to the second section (42) and a rear end (412) away from the second section (42), and the first section (41) is arranged gradually closer to the first wall (11) from the rear end (412) to the front end (411); The first section (41) has a tangent line (T) at the front end (411), and along the extension direction of the tangent line (T), the second section (42) and the first section (41) are located on the same side of the tangent line (T), and the super-hydrophobic layer (3) is arranged on the outer side wall of the first section (41).
8. The battery pack according to any one of claims 1 to 7, wherein: The electrical device (2) comprises a portion of an external interface (23) located inside a box, a single battery (21), and at least one of a battery management module (22), wherein the external interface (23) is used for plugging and matching with an external load to achieve electrical connection.
9. The battery pack according to claim 8, wherein: The battery management module (22) includes a housing box (221) and an electrical connector (222) electrically connected to the housing box (221), wherein the electrical connector (222) includes at least one of a connecting wire harness and a metal wiring bar.
10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.