Battery pack upper cover and battery pack

Abstract

The battery pack upper cover comprises a cover body and a flange edge, the flange edge is connected to at least one side of the cover body, the flange edge is provided with a first surface and a second surface which are arranged back to back, the first surface is provided with a plurality of protruding parts which are arranged along the edge of the cover body at intervals, and the second surface is provided with a plurality of protruding parts. A concave area is formed between every two adjacent protruding parts. The part, corresponding to the sunken area, of the flange edge forms a connecting structure, the connecting structure is used for being connected with a lower box body of the battery box through a fastener so that the second surface can abut against the lower box body, and the sunken area is used for containing the end of the fastener. According to the battery pack upper cover disclosed by the utility model, the end head of the fastener can be accommodated in the concave area, so that the interference risk of the fastener on the limiting between the battery pack upper cover and an external battery pack bracket is avoided. In addition, a limiting block does not need to be additionally arranged to protect the end of the fastener, so that the problem of connection failure caused by falling or dislocation of a traditional limiting block is avoided, and the connection reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack cover and a battery pack. Background Technology

[0002] In related technologies, the battery pack cover and the lower housing are connected by bolts. However, the bolt nuts protrude from the flange surface of the battery pack cover. Usually, a limit block is added to protect the protruding part of the bolt and prevent the bolt from interfering with the installation of the battery pack and the external battery pack bracket. However, the solution of adding a limit block will form a three-layer connection structure, which can easily lead to a decrease in connection reliability and an increase in cost. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery pack cover that eliminates the need for traditional limiting blocks, avoiding connection failures caused by the detachment or misalignment of traditional limiting blocks, and improving connection reliability.

[0004] This utility model also proposes a battery pack having the above-mentioned battery pack cover.

[0005] In a first aspect, embodiments of this application provide a battery pack cover, comprising:

[0006] Cover;

[0007] A flange edge is connected to at least one side of the cover. The flange edge has a first surface and a second surface disposed opposite to each other. The first surface has a plurality of protrusions spaced apart along the edge of the cover, and a recessed area is formed between two adjacent protrusions. The portion of the flange edge corresponding to the recessed area forms a connecting structure. The connecting structure is used to connect with the lower casing of the battery box by fasteners, so that the second surface abuts against the lower casing. The recessed area is used to accommodate the end of the fastener.

[0008] The battery pack according to the embodiments of this utility model has at least the following beneficial effects: When assembling the battery pack top cover and lower housing, fasteners can be used to connect the connecting structure and the lower housing, allowing the second surface of the flange edge to abut against the lower housing. The recessed area can accommodate the end of the fastener, avoiding the risk of interference caused by the fastener limiting the space between the battery pack top cover and the external battery pack support. There is no need for additional limiting blocks to protect the end of the fasteners, thereby reducing the number of parts, lowering costs, and avoiding connection failures caused by the detachment or misalignment of traditional limiting blocks, thus improving connection reliability.

[0009] According to the first aspect, in one possible implementation, the flange edge includes a support structure connecting two adjacent connection structures, one side of the support structure protruding from the connection structure to form the protrusion.

[0010] According to the first aspect, in one possible implementation, the support structure is a solid structure; or,

[0011] The support structure includes multiple ribs, which are interconnected and form a mesh.

[0012] According to the first aspect, in one possible implementation, the supporting structure and the connecting structure are an integral structure; or,

[0013] The support structure includes a base and a reinforcing member, the reinforcing member being embedded in the base, and the strength of the reinforcing member being greater than the strength of the base.

[0014] According to the first aspect, in one possible implementation, the side of the protrusion facing away from the second surface forms a limiting surface, the limiting surface being used for limiting engagement with the battery pack bracket.

[0015] According to the first aspect, in one possible implementation, the limiting surfaces of the plurality of protrusions are arranged coplanarly.

[0016] According to the first aspect, in one possible implementation, the cover includes a cover body and a high-temperature resistant layer, the cover body includes a top plate, the high-temperature resistant layer is disposed on the inner side of the top plate, and a heat insulation cavity is formed between the high-temperature resistant layer and the top plate, the heat insulation cavity being configured to be aligned with the explosion-proof valve along the axial direction of the explosion-proof valve.

[0017] According to the first aspect, in one possible implementation, the top plate has a convex hull structure with a groove on the inner side of the convex hull structure, and the high-temperature resistant layer is connected to the inner side of the top plate and closes the opening of the groove to form the heat insulation cavity.

[0018] According to the first aspect, in one possible implementation, the high-temperature resistant layer comprises a mica layer and / or a ceramic composite material layer.

[0019] Secondly, embodiments of this application also provide a battery pack, the battery pack including the battery pack cover described in the first aspect.

[0020] The battery pack according to the embodiments of this utility model has at least the following beneficial effects: By applying the above-mentioned battery pack cover, when assembling the battery pack cover and the lower housing, fasteners can be used to connect the connecting structure and the lower housing, so that the second surface of the flange edge abuts against the lower housing. The recessed area can accommodate the end of the fastener, that is, the height of the fastener end is less than the depth of the recessed area. After installation, the end of the fastener is completely sunk into the recessed area, avoiding the risk of interference caused by the fastener limiting the position between the battery pack cover and the external battery pack bracket. There is no need to set up a separate limiting block to protect the end of the fastener, thereby reducing the number of parts, reducing costs, and avoiding the connection failure problem caused by the traditional limiting block falling off or misaligning, thus improving the connection reliability.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the battery pack cover in one embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional structural diagram of the battery pack cover in one embodiment of the present invention;

[0025] Figure 3 for Figure 2 A magnified view of a portion of region B in the middle;

[0026] Figure 4 for Figure 1 A magnified view of a portion of region A in the middle;

[0027] Figure 5 for Figure 2 A magnified view of a portion of region C in the middle;

[0028] Figure 6 This is a schematic diagram of the structure of the cover body in one embodiment of the present invention.

[0029] Figure label:

[0030] 100. Battery pack top cover;

[0031] 110. Cover body; 111. Cover body; 1111. Top plate; 11111. Convex structure; 11112. Groove; 1112. Side plate; 112. High temperature resistant layer; 113. Insulation cavity;

[0032] 120. Flange edge; 121. First surface; 122. Second surface; 123. Protrusion; 124. Recessed area; 125. Connecting structure; 126. Supporting structure; 1261. Rib; 1262. Mesh; 1263. Limiting surface. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The battery pack cover and lower housing are connected by bolts. However, the bolt nuts protrude from the flange of the battery pack cover. Usually, a limit block is added to protect the protruding part of the bolt and prevent the bolt from interfering with the installation of the battery pack and the external battery pack bracket. However, the solution of adding a limit block will form a three-layer connection structure, which can easily lead to a decrease in connection reliability and an increase in cost.

[0039] To address the aforementioned problems, this application provides a battery pack cover. In some embodiments, such as... Figures 1 to 3 As shown, the battery pack cover 100 includes a cover body 110 and a flange edge 120 connected to at least one side of the cover body 110. The cover body 110 is used to cover the upper part of the battery cell and can be made of injection molding. The flange edge 120 can be a continuous or segmented structure. The flange edge 120 can also extend along the edge of the cover body 110 or be spaced along the edge of the cover body 110. The flange edge 120 is used to establish a mechanical connection with the lower housing. The flange edge 120 has a first surface 121 and a second surface 122 arranged opposite to each other. The first surface 121 is the upper surface of the flange edge 120, and the second surface 122 is the lower surface of the flange edge 120. The first surface 121 has a plurality of protrusions 123 spaced apart along the edge of the cover 110, and a recessed area 124 is formed between two adjacent protrusions 123. The protrusions 123 refer to the partially raised parts of the first surface 121 of the flange edge 120, and the recessed area 124 refers to the sunken area between two adjacent protrusions 123. The portion of the flange edge 120 corresponding to the recessed area 124 forms a connecting structure 125.

[0040] When assembling the battery pack cover 100 and the lower housing, fasteners can be used to connect the connecting structure 125 and the lower housing, so that the second surface 122 of the flange edge 120 abuts against the lower housing. The height of the fastener end is less than the depth of the recessed area 124, meaning that the end of the fastener after installation is completely sunk into the recessed area 124, avoiding the risk of interference caused by the fastener limiting the space between the battery pack cover 100 and the external battery pack bracket. Furthermore, there is no need for additional limiting blocks to protect the fastener ends, thereby reducing the number of parts, avoiding connection failures caused by the detachment or misalignment of traditional limiting blocks, and improving connection reliability.

[0041] A sealing gasket can be installed between the flange edge 120 and the lower housing, that is, the second surface 122 abuts against the sealing gasket to achieve a seal, which meets the protection level requirements of the battery pack of IP67 or above; of course, other sealing methods such as sealing coating can also be used, and this application does not limit them.

[0042] When the cross-sectional shape of the battery pack along the horizontal direction is rectangular, the edge shape of the battery pack cover 100 also tends to be rectangular overall. The flange edge 120 can be provided on any one side of the battery pack cover 100, or on adjacent or opposite side edges of the battery pack cover 100; or on three consecutive side edges or all edges of the battery pack cover 100, but this embodiment does not limit this.

[0043] Understandably, if the flange edge 120 is provided only on a portion of the edge of the battery pack cover 100, the other edges of the battery pack cover 100 should be provided with connecting flanges. The connecting flanges and flanges 120 are connected to form a continuous structure extending along the edge of the battery pack cover 100, thereby cooperating with the lower housing to eliminate gaps and improve airtightness.

[0044] In practical applications, such as Figure 2 and Figure 3 As shown, the protrusion 123 can be used in conjunction with the external battery pack bracket to achieve positioning. For example, the side of the protrusion 123 facing away from the second surface 122 forms a positioning surface 1263, that is, the top surface of the protrusion 123 serves as the positioning surface 1263; the positioning surface 1263 cooperates with the external battery bracket to form a vertical constraint, limiting the vertical movement of the battery pack under vibration or impact conditions. In this embodiment, the positioning function is integrated into the protrusion 123 of the flange edge 120, retaining only a single contact interface between the flange edge 120 and the battery pack bracket, eliminating the risk of accumulated assembly errors caused by the multi-layer connection structure formed by the separate positioning block in the prior art, and saving the processing, installation process and material consumption of the positioning block.

[0045] Based on the above embodiments, the limiting surfaces 1263 of the plurality of protrusions 123 can be coplanar, which means that the flatness of the limiting surfaces 1263 of the plurality of protrusions 123 is within a preset range. In this case, the external battery pack bracket can adopt the existing integral structure. The external battery pack bracket has a stop surface that extends horizontally and is set downward. The stop surface can simultaneously limit and cooperate with the limiting surfaces 1263 of the plurality of protrusions 123, thereby achieving uniform distribution of force and reducing the risk of flange edge 120 breaking due to force concentration.

[0046] Furthermore, since the recessed area 124 between two adjacent protrusions 123 can completely accommodate the end of the fastener, the end of the fastener will not protrude from the limiting surface 1263 and interfere with the stop surface.

[0047] The specific structure of flange 120 is further explained below, such as... Figure 1 and Figure 4As shown, the flange edge 120 includes support structures 126 and connecting structures 125 alternately connected along the edge of the cover 110. That is, a support structure 126 is connected between two adjacent connecting structures 125, and the upper surface of the support structure 126 protrudes from the upper surface of the connecting structure 125 to form a protrusion 123. In other words, the flange edge 120 forms a continuous support system at the edge of the cover 110, which can uniformly transmit the load when the flange edge 120 is subjected to external force.

[0048] Compared to the traditional straight flange edge 120, the support structure 126 in this embodiment strengthens the connection area between the flange edge 120 and the lower housing when they are connected, improving the flange edge 120's resistance to deformation when connected to the lower housing. Furthermore, the support structure 126 distributes concentrated loads to multiple nodes through periodic arrangement, avoiding single-point overload. The connection structure 125 refers to the portion of the flange edge 120 corresponding to the recessed area 124. The connection structure 125 achieves the mechanical connection between the flange edge 120 and the lower housing, and also serves as a transition zone for load transfer. Specifically, the connection structure 125 can have threaded holes or through holes, and fasteners can be bolts or rivets, allowing it to be connected to the lower housing via bolts or rivets. The connection structure 125 and the support structure 126 transition through bevels or arcs, avoiding the formation of sharp or right-angle structures.

[0049] In this embodiment, the thickness direction is defined as the vertical direction, the length direction is defined as the extension direction of the flange edge 120 along the edge of the cover 110, and the width direction is defined as the direction in which the flange edge 120 protrudes from the side wall of the cover 110. The thickness of a conventional flange edge 120 is 2mm to 10mm. In this embodiment, the thickness of the connecting structure 125 remains between 2mm and 10mm, and the thickness of the supporting structure 126 is between 10mm and 50mm. Compared to the conventional straight flange edge 120, this embodiment achieves a strengthening effect by thickening the supporting structure 126.

[0050] Furthermore, to further homogenize the load, the support structure 126 can be distributed uniformly, meaning that the lengths of all connecting structures 125 tend to be consistent. Specifically, the length and width of the connecting structure 125 are determined based on the size of the fastener ends; when using hexagonal flange bolts of M4 to M6 specifications as fasteners connecting the flange edge 120 and the lower housing, the length and width of the connecting structure 125 are both greater than or equal to 15mm, ensuring that the recessed area 124 has sufficient space to accommodate the fastener ends; the width of the support structure 126 is consistent with the width of the connecting structure 125, and the length of the support structure 126 is greater than or equal to 15mm, ensuring that the support structure 126 has sufficient contact area with the external battery pack bracket.

[0051] In the first example of the above embodiments, the support structure is a solid structure, that is, the support structure is a continuous and gapless block structure; the support structure adopts a solid structure, which can provide maximum stiffness through solid materials, and the load transmission path is single but direct, which is suitable for application scenarios with high load concentration.

[0052] In the second example of the above embodiments, the support structure 126 is a grid-like skeleton structure, that is, the support structure 126 includes multiple ribs 1261, which are connected to each other and form a mesh 1262. While reducing the amount of material used, the mesh topology forms a multi-directional force transmission path, thereby reducing the structural weight while meeting the stiffness requirements.

[0053] The supporting structure 126 may include multiple interconnected structural units. The end face shape of the structural unit may be circular, quadrilateral, triangular or other polygonal structures, and may also include a circle and a cross rib provided inside the circle. It may be other regular geometric shapes or irregular geometric shapes, which are not limited in this application.

[0054] It should be noted that the mesh 1262 is formed in the support structure 126 of the flange edge 120 and does not extend into the inner side of the battery pack. This can be achieved by designing the extension direction and length of the mesh 1262. Furthermore, the mesh-like skeleton structure is suitable for integral injection molding, reducing the shrinkage deformation of the support structure 126 during cooling and reducing processing errors.

[0055] In the third example of the above embodiments, the support structure 126 and the connecting structure 125 are an integral structure. An integral structure means that the support structure 126 and the connecting structure 125 are formed into a continuous whole structure by molding the same material in one go. Specifically, this can be achieved by injection molding, eliminating the connection interface and reducing the risk of assembly errors. The load is evenly transmitted within the integral structure of the flange edge 120 formed by the support structure 126 and the connecting structure 125, avoiding interface peeling or loosening caused by separate assembly.

[0056] In the fourth example of the above embodiments, the support structure includes a matrix and a reinforcing member. The reinforcing member is embedded in the matrix, and its strength is greater than that of the matrix. The matrix refers to the main part constituting the support structure, and can be made of engineering plastics to provide lightweight characteristics and bear the foundation load. The reinforcing member is a high-strength component embedded in the matrix, and can be made of carbon fiber composite material or metal alloy. It enhances the matrix's resistance to deformation in stress concentration areas through local reinforcement.

[0057] When the support structure adopts an embedded structure of reinforcing members, connecting ribs can be set on the surface of the reinforcing members to form a mutually interlocking connection interface with the base, thus preventing the reinforcing members from separating from the base when the support structure is subjected to external forces.

[0058] In practical applications, the support structure can be a combination of one of the first and second examples with one of the third and fourth examples. For example, the support structure can be a solid block structure integrally formed with the connecting structure; it can be as follows: Figure 1 and Figure 4 The grid-like skeleton structure shown is integrally formed with the connecting structure 125; the support structure can also adopt a reinforcing embedded structure, wherein the reinforcing member can be a solid block structure or a grid-like skeleton structure, the substrate can cover the solid block structure or the grid-like skeleton structure, or the substrate can fill into the mesh of the grid-like skeleton structure, and this application does not limit this.

[0059] In some embodiments, such as Figure 2 and Figure 5 As shown, the cover 110 includes a cover body 111 and a high-temperature resistant layer 112. The cover body 111 includes a top plate 1111. The high-temperature resistant layer 112 is disposed inside the top plate 1111, and a heat insulation cavity 113 is formed between the high-temperature resistant layer 112 and the top plate 1111. The heat insulation cavity 113 is configured to be aligned axially with the explosion-proof valve of the battery cell. The heat insulation cavity 113 refers to the sealed space formed between the top plate 1111 and the high-temperature resistant layer 112, which blocks the heat transfer path through the low thermal conductivity of the air layer. When the battery cell experiences thermal runaway, the high-temperature gas generated by the battery cell is discharged to the battery pack through the explosion-proof valve. The high-temperature resistant layer 112 can prevent the high-temperature gas from directly impacting the top plate 1111; and the heat insulation cavity 113 reduces the thermal conductivity of the high-temperature gas transferring heat to the top plate 1111, thereby extending the melting time of the cover and providing a critical time window for emergency response to battery thermal runaway.

[0060] When the battery pack is used in electrical equipment such as vehicles, the above structure can provide a longer escape time in the event of battery thermal runaway.

[0061] The number of heat insulation chambers 113 can be the same as the number of explosion-proof valves and be set in a one-to-one correspondence; the number of heat insulation chambers 113 can also be more than the number of explosion-proof valves, wherein some heat insulation chambers 113 are aligned with the explosion-proof valves along the axis of the explosion-proof valves, and this embodiment does not limit this.

[0062] Among them, the high-temperature resistant layer 112 refers to a composite material layer with high-temperature resistant properties. Specifically, it can be achieved by pressing mica sheets or molding ceramic fiber composite materials. The high-temperature resistant properties of the material itself delay the diffusion of heat to the top plate 1111.

[0063] In some embodiments, such as Figure 5 and Figure 6As shown, the top plate 1111 can be formed into a convex structure 11111 through injection molding, and a groove 11112 is formed at a corresponding position on the inner side of the top plate 1111. The high-temperature resistant layer 112 is fixed to the opening side of the groove 11112 by bonding or welding, completely covering the opening edge of the groove 11112, so that a sealed heat insulation cavity 113 is formed inside the groove 11112. The depth of the groove 11112 is determined by the height of the convex structure 11111. For example, if the height of the convex structure 11111 can be 1mm to 10mm, then the depth of the groove 11112 is also 1mm to 10mm.

[0064] In practical applications, the arrangement of the convex structures 11111 can be consistent with the arrangement of the individual battery cells within the battery pack, with gaps between adjacent convex structures 11111. The high-temperature resistant layer 112 adopts an integral structure and is attached to the inner side of the top plate 1111, thereby simultaneously sealing the grooves 11112 inside multiple convex structures 11111 to form multiple heat insulation cavities 113. In this case, the inner wall of the battery pack remains flat, reducing the impact on the individual battery cells inside the battery pack. The thickness of the high-temperature resistant layer 112 is 0.5mm to 5mm, minimizing its impact on the internal space of the battery pack.

[0065] In some embodiments, the cover body 111 includes a top plate 1111 and a side plate 1112 connected to the edge of the top edge, the top plate 1111 and the side plate 1112 forming a receiving space, and a flange edge 120 connected to the side edge of the side plate 1112 away from the top plate 1111.

[0066] Taking the integrated mesh-like skeleton structure of the support structure 126 as an example, for instance... Figures 1 to 5 As shown, based on the characteristics of injection molding materials and process feasibility, the main wall thickness of the cover body 111 is 1mm to 3.5mm, that is, the thickness of the top plate 1111 and the side plate 1112 are both 1mm to 3.5mm. Since the support structure 126 adopts an integrated mesh skeleton structure, the thickness of each rib is also designed to be 1mm to 3.5mm. When the thickness of the connecting structure 125 is 2mm to 3.5mm, the connecting structure 125 can be a solid structure; when the thickness of the connecting structure 125 is greater than 3.5mm, the connecting structure 125 can also adopt a mesh skeleton structure, and the mesh of the connecting structure 125 extends along the thickness direction, while the mesh of the support structure 126 extends along the width direction.

[0067] Furthermore, this application also proposes a battery pack, which includes the battery pack cover 100 as described above. Thanks to the improvements made to the battery pack cover 100 in the above embodiments, the battery pack of this application has the same technical effects as the battery pack cover 100 in the above embodiments, and will not be repeated here.

[0068] The battery pack typically also includes components such as a lower housing and individual battery cells. The upper cover 100 of the battery pack is connected to the lower housing by fasteners to form a mounting cavity. Multiple individual battery cells are arranged in an array within the mounting cavity, and each individual battery cell is equipped with an explosion-proof valve; this application does not describe this in detail.

[0069] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery pack cover, characterized in that, include: Cover; A flange edge is connected to at least one side of the cover body. The flange edge has a first surface and a second surface disposed opposite to each other. The first surface has a plurality of protrusions spaced apart along the edge of the cover body, and a recessed area is formed between two adjacent protrusions. The flange edge forms a connection structure corresponding to the recessed area. The connection structure is used to connect with the lower casing of the battery box by fasteners so that the second surface abuts against the lower casing. The recessed area is used to accommodate the end of the fastener.

2. The battery pack upper cover according to claim 1, characterized in that, The flange edge includes a support structure connecting two adjacent connection structures, one side of which protrudes from the connection structure to form the protrusion.

3. The battery pack upper cover according to claim 2, characterized in that, The supporting structure is a solid structure; or, The support structure includes multiple ribs, which are interconnected and form a mesh.

4. The battery pack upper cover according to claim 2, characterized in that, The supporting structure and the connecting structure are an integral part of each other; or... The support structure includes a base and a reinforcing member, the reinforcing member being embedded in the base, and the strength of the reinforcing member being greater than the strength of the base.

5. The battery pack upper cover according to claim 1, wherein, The side of the protrusion facing away from the second surface forms a limiting surface, which is used to limit and cooperate with the battery pack bracket.

6. The battery pack upper cover according to claim 5, characterized in that, The limiting surfaces of the plurality of protrusions are arranged coplanarly.

7. The battery pack upper cover according to claim 1, wherein, The cover includes a cover body and a high-temperature resistant layer. The cover body includes a top plate. The high-temperature resistant layer is disposed on the inner side of the top plate, and a heat insulation cavity is formed between the high-temperature resistant layer and the top plate. The heat insulation cavity is configured to be aligned with the explosion-proof valve along the axial direction of the explosion-proof valve.

8. The battery pack upper cover according to claim 7, characterized in that, The top plate has a convex structure with a groove on the inner side of the convex structure. The high-temperature resistant layer is connected to the inner side of the top plate and closes the opening of the groove to form the heat insulation cavity.

9. The battery pack upper cover according to claim 7, wherein, The high-temperature resistant layer includes a mica layer and / or a ceramic composite material layer.

10. A battery pack, characterized by, Includes the battery pack cover as described in any one of claims 1 to 9.

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