Battery pack protection shell

Abstract

The utility model relates to the technical field of new energy automobiles, in particular to a battery pack protection shell which comprises a box body and a cover body which are connected, and the box body comprises a first fiber composite material surface layer, a first alloy frame and a second fiber composite material surface layer. The first fiber composite material surface layer and the second fiber composite material surface layer respectively cover the outer surface and the inner surface of the first alloy frame; the cover body comprises a third fiber composite material surface layer and a second alloy frame, and the third fiber composite material surface layer covers the surface of the second alloy frame. The battery pack protection shell disclosed by the utility model meets the requirement of light weight, has good electrical insulation property, corrosion resistance and fatigue resistance, and can well meet the use requirement of an electric automobile.

Description

Technical Field

[0001] This utility model relates to the technical field of new energy vehicles, and more specifically, to a battery pack protective shell. Background Technology

[0002] The battery pack is a key component providing driving power for new energy vehicles, primarily consisting of a casing that encloses the main body of the battery pack. As the carrier of the battery modules, the battery pack protective casing houses the batteries, electronic components, sensors, and connectors, helping to protect the overall structure and safety of the vehicle and shielding critical components from potential external impacts, heat, and water seepage. Battery pack protective casings generally require electrical insulation, high-temperature resistance, and aging resistance, and must also exhibit halogen-free flame retardancy and low smoke density during combustion. Currently, aluminum alloys and magnesium alloys are commonly used for battery pack protective casings. However, with the development of energy conservation, environmental protection, and lightweighting in automobiles, glass fiber reinforced composite materials, SMC sheet materials, and carbon fiber reinforced composite materials are increasingly being used in battery pack protective casings.

[0003] If all alloy materials are used, the battery pack protective shell will have high strength, but it will be heavy and its electrical insulation, corrosion resistance and fatigue resistance will be difficult to meet the requirements of electric vehicles. If all composite materials are used, it can achieve lightweighting and obtain better electrical insulation, corrosion resistance and fatigue resistance, but the strength of composite materials will be difficult to meet the requirements of electric vehicles. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the heavy weight of alloy protective shells and the poor strength of composite materials, and to provide a battery pack protective shell that meets the requirements of lightweighting, while also possessing good electrical insulation, corrosion resistance, and fatigue resistance, thus well meeting the needs of electric vehicles.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A battery pack protective housing is provided, comprising a housing and a cover connected together. The housing includes a first fiber composite material surface layer, a first alloy frame, and a second fiber composite material surface layer, wherein the first fiber composite material surface layer and the second fiber composite material surface layer respectively cover the outer surface and inner surface of the first alloy frame. The cover includes a third fiber composite material surface layer and a second alloy frame, wherein the third fiber composite material surface layer covers the surface of the second alloy frame.

[0007] This utility model discloses a battery pack protective shell. The internal frame of the housing is a first alloy frame, with its inner and outer surfaces respectively covered by a second fiber composite material surface layer and a third fiber composite material surface layer. The internal frame of the cover is also a second alloy frame, with a third fiber composite material surface layer covering its surface. Compared to metal plates, the first and second alloy frames are lighter and have better mechanical strength. The inclusion of the second, first, and third fiber composite material surface layers helps reduce the overall weight and improves the shell's electrical insulation, corrosion resistance, and fatigue resistance. This utility model's battery pack protective shell meets the requirements for lightweight design while possessing good electrical insulation, corrosion resistance, and fatigue resistance, thus well meeting the requirements for use in electric vehicles.

[0008] Furthermore, the first alloy frame includes a first alloy strip, a second alloy strip, and a connecting plate connected between the first alloy strip and the second alloy strip, with the first alloy strip parallel to the top of the second alloy strip. The first alloy strip and the second alloy strip are bent and formed, and the connecting plate can be welded to the first alloy strip and the second alloy strip. Multiple weight-reducing holes are formed between adjacent connecting plates, which helps to achieve the lightweighting of the battery pack protective shell.

[0009] Furthermore, the first alloy strip includes a first bend, a second bend, and a third bend arranged in sequence. The first bend and the third bend are parallel to each other at both ends of the second bend. The second alloy strip includes a fourth bend and a fifth bend arranged in sequence. The connecting plate is connected between the third bend and the fourth bend. The first bend and the second bend form a mounting groove, which facilitates the closing of the cover with the box body or the connection of other structures with the box body. The third bend and the fourth bend are coplanar, facilitating connection with the connecting plate. The fifth bend can be arranged horizontally, facilitating connection with the second fiber composite material surface layer and the first fiber composite material surface layer.

[0010] Furthermore, the first fiber composite material surface layer includes a first bottom layer and first side layers disposed around the first bottom layer. The first bottom layer covers the outer surface of the bottom surface of the first alloy frame, and the first side layers cover the outer surface of the side surfaces of the first alloy frame. The outer surface of the housing is a large first fiber composite material surface layer, with its first bottom layer corresponding to the outer surface of the bottom surface of the first alloy frame and its first side layers corresponding to the outer surface of the side surfaces of the first alloy frame, facilitating the molding operation.

[0011] Furthermore, the second fiber composite surface layer includes a second bottom layer and second side layers disposed around the second bottom layer. The second bottom layer covers the inner surface of the bottom surface of the first alloy frame, and the second side layers cover the inner surface of the side surfaces of the first alloy frame. The connection between the first side layers and the second side layers forms a first overlapping surface, which is located on the top surface of the first alloy frame. When multiple receiving units exist, the inner surface of each receiving unit corresponds to one second fiber composite surface layer. The second bottom surface of each second fiber composite surface layer corresponds to the inner surface of the bottom surface of the receiving unit, and the second side surface of each second fiber composite surface layer corresponds to the inner surface of the side surfaces of the receiving unit, facilitating molding operations. The first overlapping surface effectively ensures the performance of the connection between the first fiber composite surface layer and the second fiber composite surface layer.

[0012] Furthermore, the cover also includes a fourth fiber composite material surface layer, and the connection between the third and fourth fiber composite material surface layers forms a second overlapping surface, which is located on the side of the second alloy frame. The second overlapping surface effectively ensures the performance of the connection between the third and fourth fiber composite material surface layers.

[0013] Furthermore, the enclosure is provided with a first reinforcing structure that forms multiple accommodating units in a crisscross pattern. This first reinforcing structure serves two purposes: firstly, it divides the internal space of the enclosure into multiple accommodating units, and secondly, it improves the mechanical strength of the protective shell.

[0014] Furthermore, the first reinforcing structure includes a first reinforcing plate, a second reinforcing plate, and a third reinforcing plate arranged sequentially. The first and third reinforcing plates are parallel to both ends of the second reinforcing plate. The first reinforcing plate is connected to the first alloy strip, and the third reinforcing plate is connected to the second alloy strip. The first, second, and third reinforcing plates form an I-shaped reinforcing plate.

[0015] Furthermore, the side of the housing is provided with several second reinforcing structures, each with mounting holes. These second reinforcing structures improve the mechanical strength of the protective housing's sidewalls and facilitate the machining of the mounting holes, which are used to connect the protective housing to the electric vehicle.

[0016] Furthermore, the cover fits onto the housing, with its side flush with the side of the housing, and the cover is threadedly connected to the housing. This threaded connection facilitates meeting the sealing performance requirements of the battery pack protective casing.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The battery pack protective shell of this utility model meets the requirements of lightweighting, and also has good electrical insulation, corrosion resistance and fatigue resistance, which can well meet the requirements of electric vehicles. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the battery pack protective casing;

[0020] Figure 2 A schematic diagram of the structure of the housing that protects the battery pack;

[0021] Figure 3 A schematic diagram of the structure of the cover for the battery pack protective casing;

[0022] Figure 4 This is a schematic diagram of the internal structure of the battery pack protective casing;

[0023] Figure 5 A schematic diagram of the structure of the first alloy frame for the battery pack protective casing;

[0024] Figure 6 for Figure 4 A magnified view of part A in the middle;

[0025] Figure 7 for Figure 4 A magnified view of part B in the middle;

[0026] Figure 8 This is a schematic diagram of the first fiber composite material surface layer;

[0027] Figure 9 This is a schematic diagram of the second fiber composite surface layer;

[0028] Figure 10 This is a schematic diagram of the first alloy frame;

[0029] In the attached diagram: 100, box body; 110, first fiber composite material surface layer; 111, first bottom layer; 112, first side layer; 120, first alloy frame; 121, first alloy strip; 1211, first bend; 1212, second bend; 1213, third bend; 122, second alloy strip; 1221, fourth bend; 1222, fifth bend; 123, connecting plate; 130, second fiber composite material surface layer; 131, second bottom layer; 132, second side layer; 140, housing unit; 150, first reinforcing structure; 151, first reinforcing plate; 152, second reinforcing plate; 153, third reinforcing plate; 160, second reinforcing structure; 161, mounting hole; 200, cover; 210, third fiber composite material surface layer; 220, second alloy frame; 230, fourth fiber composite material surface layer. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Example 1

[0033] This embodiment is a first embodiment of a battery pack protective casing, including a housing 100 and a cover 200 connected together. The housing 100 includes a first fiber composite material surface layer 110, a first alloy frame 120, and a second fiber composite material surface layer 130, with the first fiber composite material surface layer 110 and the second fiber composite material surface layer 130 respectively covering the outer and inner surfaces of the first alloy frame 120. The cover 200 includes a third fiber composite material surface layer 210 and a second alloy frame 220, with the third fiber composite material surface layer 210 covering the surface of the second alloy frame 220. Figures 1 to 4 As shown.

[0034] In this embodiment, the first alloy frame 120 includes a first alloy strip 121, a second alloy strip 122, and a connecting plate 123 connecting the first alloy strip 121 and the second alloy strip 122. The first alloy strip 121 is parallel to the top of the second alloy strip 122, as shown below. Figure 5As shown, the first alloy strip 121 and the second alloy strip 122 are bent into shape, and the connecting plate 123 can be welded to the first alloy strip 121 and the second alloy strip 122. In this way, multiple weight-reducing holes are formed between adjacent connecting plates 123, which helps to achieve the lightweighting of the battery pack protective shell. The number of connecting plates 123 in the length direction and the width direction of the battery pack protective shell are different. For example, four connecting plates 123 are set in the length direction, of which two connecting plates 123 are connected to the two ends of the first alloy strip 121 and the second alloy strip 122 on the side. Two connecting plates 123 are set in the width direction, of which two connecting plates 123 are connected to the middle of the first alloy strip 121 and the second alloy strip 122 on the side. In this way, while ensuring the structural strength of the first alloy frame 120, the overall weight of the protective shell is effectively reduced.

[0035] The first alloy strip 121 includes a first bent portion 1211, a second bent portion 1212, and a third bent portion 1213 arranged in sequence. The first bent portion 1211 and the third bent portion 1213 are arranged parallel to each other at both ends of the second bent portion 1212. The second alloy strip 122 includes a fourth bent portion 1221 and a fifth bent portion 1222 arranged in sequence. The connecting plate 123 connects the third bent portion 1213 and the fourth bent portion 1221. Figure 6 , 7 As shown. Specifically, the first bending portion 1211, the second bending portion 1212, and the third bending portion 1213 are integrally formed structures. The first bending portion 1211 and the third bending portion 1213 are perpendicular to the second bending portion 1212. The first bending portion 1211 and the second bending portion 1212 form an L-shaped mounting groove, which facilitates the closing of the cover 200 with the box 100, or facilitates the connection of other structures (such as the first reinforcing structure 150) with the box 100. The fourth bend 1221 and the fifth bend 1222 are integrally formed structures, and the fourth bend 1221 and the fifth bend 1222 form an L-shaped structure with a vertical cross section; the third bend 1213 and the fourth bend 1221 are coplanar, which facilitates the connection with the connecting plate 123; the second bend 1212 and the fifth bend 1222 are horizontally arranged, which facilitates the connection with the second fiber composite material surface layer 130 and the first fiber composite material surface layer 110.

[0036] Furthermore, the second alloy frame 220 has a flat plate structure. To reduce the weight of the second alloy frame 220, the flat plate structure in this embodiment is a hollow flat plate structure. The cover 200 covers the housing 100, and the side of the cover 200 is flush with the side of the housing 100. Specifically, the side of the second alloy frame 220 is flush with the side of the first bend 1211. In order to meet the sealing performance requirements of the battery pack protective shell while facilitating the installation and connection of the cover 200 and the shell, in this application, the cover 200 is threadedly connected to the housing 100.

[0037] In this embodiment, the first fiber composite material surface layer 110, the second fiber composite material surface layer 130, and the third fiber composite material surface layer 210 can be specifically fiber cloth or fiber yarn. When fiber cloth is used, it is molded onto the inner and outer surfaces of the first alloy frame 120 and the second alloy frame 220 by compression molding; when fiber yarn is used, it is molded onto the inner and outer surfaces of the first alloy frame 120 and the second alloy frame 220 by a combination of fiber winding and RTM molding. In this embodiment, the first fiber composite material surface layer 110 and the second fiber composite material surface layer 130 are preferably molded by compression molding, and the third fiber composite material surface layer 210 is preferably molded by a combination of fiber winding and RTM molding. Both compression molding and the combination of fiber winding and RTM molding are existing molding methods in the field of fiber composite materials.

[0038] In this embodiment, the internal frame of the housing 100 is a first alloy frame 120, and the inner and outer surfaces of the first alloy frame 120 are respectively covered with a second fiber composite material surface layer 130 and a first fiber composite material surface layer 110. The internal frame of the cover 200 is a second alloy frame 220, and a third fiber composite material surface layer 210 covers the surface of the second alloy frame 220. Compared with metal plates, the first alloy frame 120 and the second alloy frame 220 are lighter and have better mechanical strength. The arrangement of the second fiber composite material surface layer 130, the first fiber composite material surface layer 110, and the third fiber composite material surface layer 210 helps to reduce the overall weight of the protective shell and improve the electrical insulation performance, corrosion resistance, and fatigue resistance of the shell. The battery pack protective shell of this utility model meets the requirements of lightweighting and also has good electrical insulation performance, corrosion resistance, and fatigue resistance, which can well meet the requirements of electric vehicles.

[0039] Example 2

[0040] This embodiment is a second embodiment of the battery pack protective shell. This embodiment is similar to Embodiment 1, except that the first fiber composite material surface layer 110 includes a first bottom layer 111 and first side layer 112 disposed around the first bottom layer 111. The first bottom layer 111 covers the outer surface of the bottom of the first alloy frame 120, and the first side layer 112 covers the outer surface of the sides of the first alloy frame 120. Figure 8 As shown. Before covering the first alloy frame 120, the first fiber composite surface layer 110 is laser-cut to the required dimensions. Specifically, since the outer surface of the first alloy frame 120 is a regular rectangular structure, the first fiber composite surface layer 110 is a large fiber composite surface layer, specifically including a first bottom layer 111 and four first side layers 112 respectively disposed around the first bottom layer 111. The first bottom layer 111 and the first side layers 112 are both rectangular in shape. The length of the four first side layers 112 can be equal to the length of the intersection line of the first bottom layer 111 and the first side layers 112, or the length of the first side layers 112 can be slightly greater than the length of the intersection line of the first bottom layer 111 and the first side layers 112. When the length of the first side layer 112 is slightly greater than the length of the intersection line of the first bottom layer 111 and the first side layers 112, adjacent sets of first side layers 112 overlap at the corners of the first alloy frame 120, which can improve the performance at the corners of the first alloy frame 120. The width of the four first side layer 112 can be equal to the height of the side of the first alloy frame 120, or the width of the first side layer 112 can be slightly greater than the height of the side of the first alloy frame 120. When the width of the first side layer 112 is slightly greater than the height of the side of the first alloy frame 120, the first side layer 112 not only covers the side of the first alloy frame 120, but can also extend to cover the top surface of the first alloy frame 120, thus helping to achieve full coverage of the outer surface of the first alloy frame 120.

[0041] The second fiber composite surface layer 130 includes a second bottom layer 131 and second side layers 132 disposed around the second bottom layer 131. The second bottom layer 131 covers the inner surface of the bottom surface of the first alloy frame 120, and the second side layers 132 cover the inner surfaces of the sides of the first alloy frame 120. Figure 9As shown. The second fiber composite surface layer 130 specifically includes a second bottom layer 131 and four second side layers 132 respectively disposed around the second bottom layer 131. Both the second bottom layer 131 and the second side layers 132 are rectangular in shape. The length of the four second side layers 132 can be equal to the length of the intersection line between the second bottom layer 131 and the second side layers 132, or the length of the second side layers 132 can be slightly greater than the length of the intersection line between the second bottom layer 131 and the second side layers 132. When the length of the second side layer 132 is slightly greater than the length of the intersection line between the second bottom layer 131 and the second side layers 132, adjacent sets of second side layers 132 overlap at the corners of the inner surface of the first alloy frame 120, which can improve the performance at the corners of the first alloy frame 120. The width of the four second side layers 132 can be equal to the height of the side of the first alloy frame 120, or the width of the second side layers 132 can be slightly greater than the height of the side of the first alloy frame 120. When the width of the second side layer 132 is slightly greater than the height of the side of the first alloy frame 120, the second side layer 132 not only covers the inner side of the first alloy frame 120, but also extends to cover the top surface of the first alloy frame 120. The connection between the first side layer 112 and the second side layer 132 forms a first overlapping surface, which is located on the top surface of the first alloy frame 120. This helps to achieve full coverage of the outer surface of the first alloy frame 120 and improve the performance of the connection between the first side layer 112 and the second side layer 132.

[0042] When multiple receiving units 140 are present within the battery pack protective casing, the inner surface of each receiving unit 140 corresponds to a second fiber composite material surface layer 130. The second bottom surface of each second fiber composite material surface layer 130 corresponds to the inner bottom surface of the receiving unit 140, and the second side surface of each second fiber composite material surface layer 130 corresponds to the inner side surface of the receiving unit 140, facilitating molding operations. The length and width of the second side surface layer 132 of each second fiber composite material surface layer 130 are set with reference to the length and width of the second side surface layer 132 when setting one second fiber composite material surface layer 130.

[0043] When the fiber composite material surface layer of the cover 200 is formed by compression molding, the cover 200 also includes a fourth fiber composite material surface layer 230. A second overlapping surface is formed at the connection between the third fiber composite material surface layer 210 and the fourth fiber composite material surface layer 230. This second overlapping surface is located on the side of the second alloy frame 220. Figure 3 As shown. Specifically, the second lap surface is entirely located on the same side of the second alloy frame 220, and / or the second lap surface includes two parts, partly located on one side of the second alloy frame 220 and partly located on an adjacent side of one side of the second alloy frame 220.

[0044] The specific implementation steps of this embodiment are similar to those of Embodiment 1, except that:

[0045] By setting the shapes of the first fiber composite surface layer 110, the second fiber composite surface layer 130, the third fiber composite surface layer 210, and the fourth fiber composite surface layer 230, the molding difficulty of the fiber composite surface layer on the inner and outer surfaces of the alloy frame is reduced. By setting the first overlapping surface and the second overlapping surface, the performance at the corners of the first alloy frame 120 and the second alloy frame 220 is improved without increasing the molding difficulty of the fiber composite surface layer on the inner and outer surfaces of the alloy frame.

[0046] Example 3

[0047] This embodiment is the third embodiment of the battery pack protective shell. This embodiment is similar to the second embodiment, except that the housing 100 is provided with a first reinforcing structure 150 that forms multiple accommodating units 140 in a crisscross pattern. The first reinforcing structure 150 can divide the space inside the housing 100 into multiple accommodating units 140 on the one hand, and improve the mechanical strength of the protective shell on the other hand.

[0048] The first reinforcing structure 150 includes a first reinforcing plate 151, a second reinforcing plate 152, and a third reinforcing plate 153 arranged sequentially. The first reinforcing plate 151 and the third reinforcing plate 153 are parallel to the two ends of the second reinforcing plate 152. The first reinforcing plate 151 is connected to the first alloy strip 121, and the third reinforcing plate 153 is connected to the second alloy strip 122. Figure 10 As shown. The first reinforcing plate 151, the second reinforcing plate 152, and the third reinforcing plate 153 form a reinforcing plate with an "I"-shaped cross-section. In this embodiment, the surface of the first reinforcing structure 150 is also covered with a fiber composite material surface layer. The fiber composite material surface layer can be formed on the surface of the first reinforcing structure 150 first, and then the first reinforcing structure 150 can be connected to the first alloy frame 120. Alternatively, the first reinforcing structure 150 can be connected to the first alloy frame 120 first, and then the inner surfaces of the multiple receiving units 140 can be covered with the fiber composite material surface layer.

[0049] Specifically, the end of the first reinforcing plate 151 is placed in an "L"-shaped mounting groove, and the edge of the end of the first reinforcing plate 151 abuts against the inner surface of the first bending portion 1211; the edge of the end of the third reinforcing plate 153 is connected to the fifth bending portion 1222. The first reinforcing plate 151, the second reinforcing plate 152, and the third reinforcing plate 153 can be integrally formed, or the first reinforcing plate 151 and the third reinforcing plate 153 can be connected to both ends of the second reinforcing plate 152. The horizontal projections of the first reinforcing plate 151 and the third reinforcing plate 153 are partially located within the horizontal projection area of ​​the receiving unit 140, thus providing good support for the battery pack unit.

[0050] In addition, the side of the housing 100 is provided with several second reinforcing structures 160, and the second reinforcing structures 160 are provided with mounting holes 161. The second reinforcing structures 160 improve the mechanical strength of the protective housing sidewall and facilitate the machining of the mounting holes 161, which are used to connect the protective housing to the electric vehicle.

[0051] The specific implementation steps of this embodiment are similar to those of Embodiment 1 or Embodiment 2, except that:

[0052] By setting the first reinforcing structure 150, the area within the first alloy frame 120 is divided into multiple receiving units 140. On the one hand, this can improve the mechanical strength of the protective shell, and on the other hand, multiple battery pack units can be placed and protected separately. By setting the second reinforcing structure 160, the mechanical strength of the protective shell is further improved. Moreover, the second reinforcing structure 160 is provided with mounting holes 161 to facilitate the connection of the protective shell to the electric vehicle, avoiding the adverse effects of openings in the main body of the housing 100 and the cover 200 on the performance of the battery pack protective shell.

[0053] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack protective casing, characterized in that, The device includes a housing (100) and a cover (200) connected together. The housing (100) includes a first fiber composite material surface layer (110), a first alloy frame (120), and a second fiber composite material surface layer (130). The first fiber composite material surface layer (110) and the second fiber composite material surface layer (130) respectively cover the outer and inner surfaces of the first alloy frame (120). The cover (200) includes a third fiber composite material surface layer (210) and a second alloy frame (220). The third fiber composite material surface layer (210) covers the surface of the second alloy frame (220).

2. The battery pack protective housing according to claim 1, characterized in that, The first alloy frame (120) includes a first alloy strip (121), a second alloy strip (122), and a connecting plate (123) connecting the first alloy strip (121) and the second alloy strip (122), wherein the first alloy strip (121) is parallel to the top of the second alloy strip (122).

3. The battery pack protective housing according to claim 2, characterized in that, The first alloy strip (121) includes a first bent portion (1211), a second bent portion (1212) and a third bent portion (1213) arranged in sequence. The first bent portion (1211) and the third bent portion (1213) are arranged parallel to each other at both ends of the second bent portion (1212). The second alloy strip (122) includes a fourth bent portion (1221) and a fifth bent portion (1222) arranged in sequence. The connecting plate (123) is connected between the third bent portion (1213) and the fourth bent portion (1221).

4. The battery pack protective housing according to claim 1, characterized in that, The first fiber composite surface layer (110) includes a first bottom layer (111) and a first side layer (112) disposed around the first bottom layer (111). The first bottom layer (111) covers the outer surface of the bottom of the first alloy frame (120), and the first side layer (112) covers the outer surface of the side of the first alloy frame (120).

5. The battery pack protective housing according to claim 4, characterized in that, The second fiber composite surface layer (130) includes a second bottom layer (131) and a second side layer (132) disposed around the second bottom layer (131). The second bottom layer (131) covers the inner surface of the bottom of the first alloy frame (120), and the second side layer (132) covers the inner surface of the side of the first alloy frame (120). The connection between the first side layer (112) and the second side layer (132) forms a first overlapping surface, which is located on the top surface of the first alloy frame (120).

6. The battery pack protective housing according to claim 1, characterized in that, The cover (200) also includes a fourth fiber composite material surface layer (230), and a second overlapping surface is formed at the connection between the third fiber composite material surface layer (210) and the fourth fiber composite material surface layer (230), and the second overlapping surface is located on the side of the second alloy frame (220).

7. The battery pack protective housing according to claim 2, characterized in that, The housing (100) is provided with a first reinforcing structure (150) that forms multiple accommodating units (140) through a crisscross pattern.

8. The battery pack protective housing according to claim 7, characterized in that, The first reinforcing structure (150) includes a first reinforcing plate (151), a second reinforcing plate (152), and a third reinforcing plate (153) arranged in sequence. The first reinforcing plate (151) and the third reinforcing plate (153) are parallel to the two ends of the second reinforcing plate (152). The first reinforcing plate (151) is connected to the first alloy strip (121), and the third reinforcing plate (153) is connected to the second alloy strip (122).

9. The battery pack protective housing according to any one of claims 1 to 8, characterized in that, The side of the housing (100) is provided with several second reinforcing structures (160), and the second reinforcing structures (160) are provided with mounting holes (161).

10. The battery pack protective housing according to any one of claims 1 to 8, characterized in that, The cover (200) covers the box (100) and the side of the cover (200) is flush with the side of the box (100). The cover (200) is threadedly connected to the box (100).

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