CN215644694U - Battery pack upper cover and battery pack - Google Patents

Abstract

The utility model provides a battery pack upper cover and a battery pack, and relates to the field of lithium battery manufacturing. The upper cover of the battery pack comprises a cover plate body and a side wall which are mutually connected, wherein the cover plate body and the side wall form a groove together; the cover plate body comprises a first surface and a second surface which are oppositely arranged, and the second surface is positioned on one side of the cover plate body, which faces the notch of the groove; be equipped with first depressed part and first bulge on first surface and/or the second surface to the intensity of reinforcing apron body, the deformation of upper cover when reducing the vibration, thereby improve the structural strength of whole battery package.

Description

Battery pack upper cover and battery pack

Technical Field

The utility model relates to the field of lithium battery manufacturing, in particular to a battery pack upper cover and a battery pack.

Background

The existing battery pack upper cover is mostly in a flat plate shape, namely the surface of the upper cover is smooth. Such a structure easily produces vibration of great amplitude in the transportation or use of product, and the deformation of upper cover is great when vibrating promptly, probably forms pressure to the upper surface of battery module or aluminium bar etc. and touch to influence the insulating properties of product.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery pack upper cover and a battery pack, which can reduce the deformation of the upper cover during vibration and improve the structural strength of the upper cover, thereby improving the safety and reliability of products.

The embodiment of the utility model is realized by the following steps:

in a first aspect, the utility model provides a battery pack upper cover, which comprises a cover plate body and a side wall, wherein the cover plate body and the side wall are connected with each other to form a groove together; the cover plate body comprises a first surface and a second surface which are oppositely arranged, and the second surface is positioned on one side, facing the notch of the groove, of the cover plate body; the first surface and/or the second surface are provided with a first concave part and a first convex part.

In an alternative embodiment, the first recess on the first surface corresponds to the first projection on the second surface, and the first projection on the first surface corresponds to the first recess on the second surface.

In an alternative embodiment, the cover plate body and the side wall are formed by stamping.

In an alternative embodiment, the first recess merges with the adjacent first projection arc.

In an alternative embodiment, the surface of the first protrusion is cambered, and the surface of the first recess is cambered.

In an alternative embodiment, the sidewall includes a third surface and a fourth surface disposed opposite to each other, a second concave portion and a second convex portion are disposed on the third surface and/or the fourth surface, the third surface and the first surface are disposed on the outer surface of the groove, the fourth surface and the second surface are disposed on the inner surface of the groove, the second concave portion and the first concave portion on the outer surface of the groove are connected, and the second convex portion on the outer surface of the groove is connected to the first convex portion.

In an alternative embodiment, the second recess is connected to the first recess by a circular arc, and the second projection is connected to the first projection by a circular arc transition.

In an optional implementation manner, the cover plate further comprises a folded portion, the folded portion is connected to one end, far away from the cover plate body, of the side wall, the second protruding portion is in arc transitional connection with the folded portion, and the second recessed portion is in arc transitional connection with the folded portion.

In an alternative embodiment, the cover plate body is in transitional connection with the side wall arc.

In a second aspect, the present invention provides a battery pack, which includes a case and the battery pack upper cover as described in any one of the foregoing embodiments, wherein the case is connected to the battery pack upper cover.

The embodiment of the utility model has the beneficial effects that:

according to the battery pack upper cover provided by the embodiment of the utility model, the first protruding part and the first recessed part are arranged on the first surface and/or the second surface of the cover plate body, so that the surface of the cover plate body is in an uneven state.

The battery pack provided by the embodiment of the utility model comprises the box body and the battery pack upper cover, and the battery pack upper cover has the advantages that the strength is increased and the deformation during vibration is reduced due to the structural improvement of the battery pack upper cover, so that the integral structural strength and reliability of the battery pack are improved, and the product quality of a battery pack product is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of a first view of a structure of an upper cover of a battery pack according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic diagram of a second view of a structure of a cover of a battery pack according to an embodiment of the utility model;

FIG. 4 is a schematic diagram of a simulation analysis of a conventional upper cover structure;

fig. 5 is a schematic diagram of a simulation analysis of a battery pack upper cover having a first structure according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a simulation analysis of a battery pack upper cover having a second structure according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a simulation analysis of a battery pack upper cover with a third structure according to an embodiment of the present invention.

Icon: 100-upper cover of battery pack; 110-a cover plate body; 101-a first surface; 102-a second surface; 103-a groove; 105-a third surface; 121-a first projection; 123-a first recess; 130-a side wall; 131-a second projection; 133-a second recess; 150-a fold-over portion; 151-mounting holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

With the vigorous development of new energy fields, electric vehicles have become the mainstream trend in the future. The battery pack is used as the most core power supply part of the electric automobile, and determines key indexes of the whole automobile such as driving range, cost, service life, safety, maintainability and the like to a great extent. The battery pack comprises a box body, an upper cover and a battery module, wherein the box body and the upper cover are connected to form a containing cavity, and the battery module is arranged in the containing cavity. In the prior art, the upper cover of battery package is flat plate mostly, and the surface of upper cover is smooth promptly, and such structure is in the use, produces great deformation because the vibration easily to make the upper cover press with the upper surface of battery module or aluminium bar etc. and touch, influence the insulating properties of battery package, there is great potential safety hazard.

In order to overcome the above defects in the prior art, the battery pack upper cover 100 provided in this embodiment improves and optimizes the surface structure of the upper cover, can reduce the mode, reduce the deformation during vibration, prevent the upper cover from contacting with the upper surface of the battery module during vibration to affect the insulation performance, and improve the safety and reliability of product use.

Referring to fig. 1 to 3, the battery pack upper cover 100 provided in the present embodiment includes a cover plate body 110 and a side wall 130 connected to each other, wherein the cover plate body 110 and the side wall 130 form a groove 103 together; the cover plate body 110 comprises a first surface 101 and a second surface 102 which are oppositely arranged, and the second surface 102 is positioned on the notch side of the cover plate body 110 facing the groove 103; the first surface 101 and/or the second surface 102 are provided with a first recess 123 and a first protrusion 121 to enhance the strength of the cover body 110. It is easily understood that the first recess 123 and the first protrusion 121 may be provided only on the first surface 101, or the first recess 123 and the first protrusion 121 may be provided only on the second surface 102, or the first recess 123 and the first protrusion 121 may be provided on both the first surface 101 and the second surface 102.

In this embodiment, the first surface 101 is provided with a first recess 123 and a first protrusion 121, and the second surface 102 is also provided with a first recess 123 and a first protrusion 121. On the first surface 101 of the cover plate body 110, the first protrusions 121 are uniformly distributed in a long strip shape at intervals, the arrangement direction of the first protrusions 121 is parallel to the width direction of the cover plate body 110, and a first recess 123 is arranged between two adjacent first protrusions 121, that is, the first recess 123 and the first protrusion 121 are alternately arranged. The sunken degree of depth of first depressed part 123 is roughly equal with the protruding height of first bulge 121, and the width of first depressed part 123 is roughly equal with the width of first bulge 121, and first depressed part 123 and first bulge 121 evenly distributed are on first surface 101 promptly, set up like this for the stress distribution of apron body 110 is more even, is favorable to improving structural strength, promotes the structural reliability of battery package upper cover 100. Of course, it is understood that the first protrusions 121 may also be disposed along a direction forming a certain angle with the width direction of the cover body 110, and the first protrusions 121 and the first recesses 123 may be disposed side by side at intervals, or may be disposed in a crossed manner, for example, the first protrusions 121 are disposed along the length direction of the cover body 110, and the first recesses 123 are disposed along the width direction of the cover body 110, which is not limited specifically here. In this embodiment, the first protrusion 121 and the first recess 123 are both disposed along the width direction of the cap body 110.

In addition, in other alternative embodiments, the widths and depths of the first recesses 123 may be designed to be different, and in the same way, the heights of the first protrusions 121 may also be different, so that the height distribution may be present, and the widths of the first protrusions 121 may also be designed to be different, thereby further improving the structural strength and the aesthetic appearance of the battery pack upper cover 100.

Optionally, in this embodiment, the cover body 110 and the sidewall 130 are integrally formed, the first recess 123 on the first surface 101 of the cover body 110 corresponds to the first protrusion 121 on the second surface 102, and the first protrusion 121 on the first surface 101 corresponds to the first recess 123 on the second surface 102. Optionally, the cover plate body 110 and the side wall 130 are formed by stamping, the first recess 123 on the first surface 101 of the cover plate body 110 is the first protrusion 121 on the second surface 102, and the first protrusion 121 on the first surface 101 is the first recess 123 on the second surface 102. Adopt stamping forming, can form first depressed part 123 and first bulge 121 on apron body 110 fast, simple process, structural strength is big, simultaneously, this kind of mode is compared in the protruding mode of establishing the strengthening rib strip on the surface of apron body 110 more material saving, can not increase apron body 110's weight, is favorable to promoting structural strength in, is favorable to the lightweight design of battery package upper cover 100 structure.

Optionally, the height of the first protrusion 121 protruding the first recess 123 is 3mm to 10mm, such as 5mm, 6mm, or 7mm, which can improve the structural strength and the aesthetic appearance of the structure surface. In order to reduce the structural stress on the surface of the cover plate body 110, the first recess 123 is in arc transition connection with the adjacent first protrusion 121, so as to avoid local stress concentration. In addition, the surface of the first protrusion 121 of this embodiment is an arc surface, the surface of the first recess 123 is an arc surface, and on the first surface 101 side of the cover plate body 110, the surfaces of the first recess 123 and the first protrusion 121 are slightly curved arc surfaces, and the arc surfaces are outwardly convex, so that the surface of the cover plate body 110 can prevent water accumulation. Of course, without being limited thereto, the surfaces of the first recess 123 and the first protrusion 121 may be provided as slopes, etc., and are not particularly limited thereto.

It should be noted that the structure and distribution of the first recesses 123 and the first protrusions 121 on the second surface 102 are similar to the structure and distribution of the first recesses 123 and the first protrusions 121 on the second surface 102, and the description thereof is omitted here.

Further, the sidewall 130 includes a third surface 105 and a fourth surface (not shown) disposed opposite to each other, the third surface 105 and/or the fourth surface is provided with a second concave portion 133 and a second convex portion 131, the third surface 105 and the first surface 101 are located on an outer surface of the groove 103, and the fourth surface and the second surface 102 are located on an inner surface of the groove 103. It is understood that the second recesses 133 and the second protrusions 131 may be provided only on the third surface 105, or the second recesses 133 and the second protrusions 131 may be provided only on the fourth surface, or the second recesses 133 and the second protrusions 131 may be provided on both the third surface 105 and the fourth surface. Alternatively, second recess 133 on the outer surface of groove 103 is connected to first recess 123, while second projection 131 on the outer surface of groove 103 is connected to first projection 121. It is easy to understand that, the cover plate body 110 and the side wall 130 are integrally formed, and on the same surface (inner surface or outer surface) of the groove 103, the second protrusions 131 on the side wall 130 correspond to the first protrusions 121 on the cover plate body 110 one by one, and the second recesses 133 on the side wall 130 correspond to the first recesses 123 on the cover plate body 110 one by one. In other words, the second protrusion 131 may be formed by extending the first protrusion 121 along the sidewall 130, and the second recess 133 may also be formed by extending the first recess 123 along the sidewall 130. Since the first recess 123 and the first protrusion 121 are disposed in the width direction of the cap body 110 in the present embodiment, the second recess 133 and the second protrusion 131 are distributed only on the two opposite sidewalls 130. In other alternative embodiments, the second concave portion 133 and the second convex portion 131 may be distributed on the other two opposite sidewalls 130, or on the four sidewalls 130. By forming the second recess 133 and the second protrusion 131 on the side wall 130, the structural strength of the pack upper cover 100 can be further improved.

Alternatively, the second concave portion 133 and the adjacent second convex portion 131 are in circular-arc transition connection, and on the same surface (inner surface or outer surface) of the groove 103, taking the first surface 101 and the third surface 105 as an example, the second concave portion 133 and the first concave portion 123 are in circular-arc transition connection, and the second convex portion 131 and the first convex portion 121 are in circular-arc transition connection. Set up like this and to reduce the stress concentration of battery package upper cover 100, improve the structural strength of battery package, reduce the mode, reduce the deformation that battery package upper cover 100 took place among the vibration process, prevent that battery package upper cover 100 from contacting with the upper surface or the aluminium bar of inside battery module and influencing insulating properties.

In this embodiment, the battery pack upper cover 100 further includes a folding portion 150, the folding portion 150 is connected to one end of the side wall 130 far away from the cover plate body 110, the folding portion 150 extends along the outer side of the groove 103, the folding portion 150 is used for being connected with the box body of the battery pack, the folding portion 150 is arranged to facilitate the installation of the battery pack upper cover 100 and the box body, and the disassembly and assembly are more convenient. Optionally, the folded part 150 is provided with a mounting hole 151, and a connecting member such as a bolt is inserted into the mounting hole 151 for fixedly connecting the battery pack upper cover 100 and the box body. In the battery pack upper cover 100 provided by this embodiment, the second protruding portion 131 and the folded portion 150 are in arc transition connection, and the second recessed portion 133 and the folded portion 150 are in arc transition connection. It should be understood that the second protrusions 131 start from the cover body 110 and end at the folded portion 150, that is, the length of each second protrusion 131 is substantially equal to the height of the sidewall 130, and the length of each second recess 133 is substantially equal to the height of the sidewall 130. Since the sidewall 130 and the cap body 110 are integrally formed, the second concave portion 133 and the second convex portion 131 on the sidewall 130 can also be formed by stamping, that is, the second concave portion 133 on the third surface 105 is the second convex portion 131 on the fourth surface, and the second convex portion 131 on the third surface 105 is the second concave portion 133 on the fourth surface.

It should be noted that the structure and distribution of the second protrusions 131 and the second recesses 133 on the fourth surface are similar to the structure and distribution of the second protrusions 131 and the second recesses 133 on the third surface 105, and are not described herein again. It can be understood that the second protrusions 131 are similar to the first protrusions 121 in structure and distribution, and the height and width thereof can be flexibly set, and the second recesses 133 are similar to the first recesses 123 in structure and distribution, and the depth and width thereof can be flexibly set. In addition, the shapes of first protrusion 121, second protrusion 131, first recess 123 and second recess 133 include, but are not limited to, various geometric figures, such as a circle, a diamond, a rectangle, a triangle, a semicircle, a sphere, a hexagon or an octagon, etc., and may also be various patterns or other arbitrary patterns, which are not limited herein.

In this embodiment, the cover plate body 110 is in arc transition connection with the side walls 130, the number of the side walls 130 is four, the four side walls 130 are respectively connected with the cover plate body 110, the four side walls 130 and the cover plate body 110 jointly enclose the groove 103, and the corners formed by connecting the two adjacent side walls 130 are in arc transition connection, so as to improve the overall structural strength of the battery pack upper cover 100.

To sum up, in the battery pack upper cover 100 provided by the embodiment of the present invention, the cover plate body 110, the side wall 130 and the folding part 150 are integrally formed, the first concave part 123, the first protruding part 121, the second concave part 133 and the second protruding part 131 are distributed on the cover plate body 110 as structural reinforcing components and extend to the side wall 130, and the first concave part 123, the first protruding part 121, the second concave part 133 and the second protruding part 131 can be formed by punching, so that the processing and manufacturing are convenient, the production cost is low, and the structural strength of the battery pack upper cover 100 is greatly improved. The first recesses 123 and the first protrusions 121 may be arranged on the cover body 110 in a regular or irregular arrangement, such as being arranged side by side or crossed, or arranged to form any other pattern, which is not limited herein. The battery pack upper cover 100 further adopts an optimized scheme of circular arc transition connection, for example, the circular arc connection of the first concave part 123 and the adjacent first convex part 121, the circular arc connection of the second concave part 133 and the adjacent second convex part 131, the circular arc connection of the side wall 130 and the side wall 130, the circular arc connection of the side wall 130 and the cover plate body 110, the circular arc connection of the second concave part 133 and the folded part 150, the circular arc connection of the second convex part 131 and the folded part 150, and the like, so that the stress concentration phenomenon can be reduced, the structural strength of the battery pack upper cover 100 is further improved, the mode is reduced, the deformation in the vibration process is reduced, the battery pack upper cover 100 is prevented from being pressed with the upper surface of an internal battery module or an aluminum bar to cause insulation failure, and the use safety and reliability of the battery module are improved.

In order to verify the structural strength of the battery pack upper cover 100 provided by the embodiment of the utility model, simulation analysis is respectively performed on the structure before improvement and the structure after improvement, the simulated working condition in the simulation process adopts the harsh condition of 2 times of the RMS value of GBT31467.3-2015 vibration load in the random vibration Z direction to perform structural verification, the adopted whole battery pack model is calculated, and the structural analysis is performed by extracting the result of the sub-component battery pack upper cover 100 alone.

Fig. 4 is a schematic diagram of simulation analysis results performed on a flat upper cover in the prior art, and it can be seen from the diagram that most of the areas of the upper cover of the prior battery pack, such as the middle and the edge, are failed.

Fig. 5 is a diagram showing a simulation analysis result of the first structure of the upper cover 100 of the battery pack according to the present embodiment, in which the first recess 123 and the first protrusion 121 are arranged side by side only on the cover body 110. The simulation results show that, compared with the results shown in fig. 4, the structure eliminates the phenomenon that the middle part of the upper cover 100 of the battery pack fails in a large area, and the failure phenomenon occurs only at the positions of the two side walls 130.

Fig. 6 is a diagram of a simulation analysis result of a second structure of the upper cover 100 of the battery pack according to the present embodiment, in which the first recess 123 and the first protrusion 121 on the cover body 110 are respectively extended to the side wall 130 on the basis of the structure of fig. 5, that is, the second recess 133 and the second protrusion are formed on the side wall 130. The simulation results show that, compared to the results shown in fig. 5, the failure areas of the two sidewalls 130 are also reduced, and only a local small area of the connection between the two sidewalls 130 and the cover plate body 110 is failed.

Fig. 7 is a diagram of a simulation analysis result of a third structure of the upper cover 100 for a battery pack according to the present embodiment, which is based on the structure of fig. 6, and the structure is obtained by optimizing the corner joints of the upper cover 100 for a battery pack, including, but not limited to, the circular arc connection between the first concave portion 123 and the adjacent first convex portion 121, the circular arc connection between the second concave portion 133 and the adjacent second convex portion 131, the circular arc connection between the side wall 130 and the side wall 130, the circular arc connection between the side wall 130 and the cover plate body 110, the circular arc connection between the second concave portion 133 and the folded portion 150, and the circular arc connection between the second convex portion 131 and the folded portion 150. Simulation results show that the whole battery pack upper cover 100 has no failure area, and the structural strength requirement under relatively severe working conditions is completely met.

The embodiment of the utility model provides a still type provides a battery package, including box, battery module and foretell battery package upper cover 100, the box is connected with battery package upper cover 100, and forms and hold the cavity, and the battery module setting is holding in the cavity. Because this battery package upper cover 100 has adopted and has set up first depressed part 123 and first bulge 121 on apron body 110, set up the additional strengthening of second depressed part 133 and second bulge 131 on lateral wall 130, and adopt circular arc transitional coupling in each corner, the structural strength of battery package upper cover 100 has been improved greatly, reduce the mode of battery package upper cover 100, reduce the deformation of vibration in-process, prevent that apron body 110 from pressing with battery module upper surface or aluminium bar and touching and influence insulating properties, thereby the holistic structural strength of battery package and security performance have been improved greatly.

In summary, the battery pack upper cover 100 and the battery pack provided by the embodiment of the utility model have the following beneficial effects:

according to the battery pack upper cover 100 and the battery pack provided by the embodiment of the utility model, the structural strength of the battery pack upper cover 100 is greatly improved, the mode of the battery pack upper cover 100 is reduced, the deformation generated in the vibration process is reduced, the cover plate body 110 is prevented from being pressed with the upper surface of a battery module or an aluminum bar to influence the insulation performance, and meanwhile, the function of preventing water accumulation is also achieved, so that the integral structural strength and safety performance of the battery pack are greatly improved. In addition, the battery pack upper cover 100 is formed by punching, so that the manufacturing and processing are convenient, the production cost is low, and the product has greater market competitive advantage.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The upper cover of the battery pack is characterized by comprising a cover plate body and a side wall which are connected with each other, wherein the cover plate body and the side wall form a groove together; the cover plate body comprises a first surface and a second surface which are oppositely arranged, and the second surface is positioned on one side, facing the notch of the groove, of the cover plate body; the first surface and/or the second surface are provided with a first concave part and a first convex part.

2. The battery pack cover according to claim 1, wherein the first recess on the first surface corresponds to the first projection on the second surface, and the first projection on the first surface corresponds to the first recess on the second surface.

3. The battery pack upper cover according to claim 1, wherein the cover plate body and the side wall are formed by stamping.

4. The battery pack cover according to claim 1, wherein the first concave portion is in arc transition connection with the adjacent first convex portion.

5. The battery pack cover according to claim 1, wherein the surface of the first protruding portion is a curved surface, and the surface of the first recessed portion is a curved surface.

6. The battery pack cover according to claim 1, wherein the sidewall comprises a third surface and a fourth surface that are opposite to each other, and a second recess and a second protrusion are provided on the third surface and/or the fourth surface, the third surface and the first surface are located on the outer surface of the groove, the fourth surface and the second surface are located on the inner surface of the groove, and the second recess and the first recess on the outer surface of the groove are connected, and the second protrusion on the outer surface of the groove is connected to the first protrusion.

7. The battery pack cover of claim 6, wherein the second concave portion is connected with the first concave portion through an arc, and the second convex portion is connected with the first convex portion through an arc transition.

8. The battery pack upper cover according to claim 6, further comprising a folded portion connected to an end of the side wall away from the cover plate body, wherein the second protruding portion is in arc transition connection with the folded portion, and the second recessed portion is in arc transition connection with the folded portion.

9. The battery pack upper cover according to any one of claims 1 to 8, wherein the cover plate body is transitionally connected with the side wall arc.

10. A battery pack characterized by comprising a case body and the battery pack upper cover according to any one of claims 1 to 9, the case body being connected to the battery pack upper cover.

Images