Lower box body and battery pack

Abstract

The utility model provides a lower box body and a battery pack, and relates to the technical field of batteries. The lower box body comprises a box body and an energy absorption assembly, the box body comprises a bottom plate and a surrounding plate connected to the bottom plate, the bottom plate and the surrounding plate jointly define a containing cavity, the energy absorption assembly is provided with a first side and a second side which are opposite, the first side of the energy absorption assembly is connected to the inner wall face of the surrounding plate, and the second side of the energy absorption assembly is used for abutting against a battery module. The energy absorption assembly comprises an energy absorption piece and a connecting piece, the energy absorption piece is of a hollow structure and used for abutting against the battery module, and the connecting piece is connected to the inner wall face of the surrounding plate and the energy absorption piece. Due to the fact that the energy absorption assembly is arranged between the surrounding plate and the battery module, when the outer side of the surrounding plate is collided, even if the surrounding plate deforms to a certain degree, the energy absorption piece can absorb the deformation amount of the surrounding plate, and therefore the battery module or a liquid cooling assembly in the lower box body is prevented from being damaged. Therefore, the lower box body provided by the embodiment of the utility model has better protection performance.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a lower box and a battery pack. Background Art

[0002] In current power batteries, the lower box of the battery pack is made by sheet metal stamping. Usually, the lower box of the battery pack is directly exposed to the chassis of the car, and may collide with foreign objects while the car is driving, such as stones splashing to the outside of the lower box, or colliding with protrusions on the ground. However, the existing lower box has poor impact resistance, so it is easy for the lower box to deform due to external impact, and then damage the key components such as the battery module or water cooling assembly inside the lower box. Utility Model Content

[0003] The purpose of the present application is to provide a lower box and a battery pack, which have better impact resistance and can better protect the relevant components inside the lower box.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, the present application provides a lower box for accommodating a battery module, comprising a box and an energy absorbing assembly, wherein the box comprises a bottom plate and a surrounding plate connected to the bottom plate, wherein the bottom plate and the surrounding plate together form a accommodating cavity, and the energy absorbing assembly has a first side and a second side opposite to each other, wherein the first side of the energy absorbing assembly is connected to an inner wall surface of the surrounding plate, and the second side of the energy absorbing assembly is used to abut against the battery module;

[0006] The energy absorbing assembly includes an energy absorbing member and a connecting member. The energy absorbing member is a hollow structure and is used to abut against the battery module. The connecting member is connected to the inner wall surface of the enclosure and the energy absorbing member.

[0007] In an optional embodiment, the energy absorbing member includes a first plate body, a second plate body and a third plate body that together form a cavity, the outer side of the first plate body is used to abut the battery module, the connecting member is connected to the outer surface of the second plate body, and the third plate body is located on the side of the energy absorbing member away from the bottom plate.

[0008] In an optional embodiment, the energy absorbing member further includes two sealing plates, and two openings of the cavity surrounded by the first plate body, the second plate body and the third plate body in the second direction are respectively blocked by the two sealing plates.

[0009] In an optional embodiment, the base plate is rectangular, the enclosure includes two end plates spaced apart in a first direction and two side plates spaced apart in a second direction, the first direction is perpendicular to the second direction, and an energy absorbing component is provided on the inner wall surface of at least one of the two end plates.

[0010] In an optional embodiment, the end plate is an outwardly convex arc-shaped plate.

[0011] In an optional embodiment, the connecting member is plate-shaped and has a first edge and a second edge, the first edge is an arc edge adapted to the inner wall surface of the end plate and connected to the inner wall surface of the end plate, and the second edge is connected to the energy absorbing member.

[0012] In an optional embodiment, the energy absorbing assembly includes a plurality of connecting members, and the plurality of connecting members are arranged at intervals in the second direction.

[0013] In an optional embodiment, a first reinforcing rib is provided on the side panel.

[0014] In an optional embodiment, a second reinforcing rib is provided on the bottom plate.

[0015] In an optional embodiment, the second reinforcement rib is formed by a stamping process and protrudes toward the outside of the accommodating cavity.

[0016] In a second aspect, the present application provides a battery pack, comprising a battery module and a lower box body of any one of the aforementioned embodiments, wherein the battery module is disposed in a receiving cavity of the lower box body.

[0017] The beneficial effects of the embodiments of the present application are:

[0018] The lower box provided in the embodiment of the present application includes a box and an energy absorbing component. The box includes a bottom plate and a panel connected to the bottom plate. The bottom plate and the panel together form a accommodating cavity. The energy absorbing component has a first side and a second side opposite to each other. The first side of the energy absorbing component is connected to the inner wall surface of the panel, and the second side of the energy absorbing component is used to abut the battery module. The energy absorbing component includes an energy absorbing member and a connecting member. The energy absorbing member is a hollow structure. The energy absorbing member is used to abut the battery module. The connecting member is connected to the inner wall surface of the panel and the energy absorbing member. Since the energy absorbing member is arranged between the panel and the battery module, and the energy absorbing member of the energy absorbing member is a hollow structure, when the outer side of the panel is collided, even if the panel is deformed to a certain extent, the energy absorbing member can absorb the deformation of the panel, thereby avoiding damage to the battery module or liquid cooling component in the lower box. Therefore, the lower box provided in the embodiment of the present application has better protection performance.

[0019] The battery pack provided in the embodiment of the present application includes a battery module and the above-mentioned lower box, and the battery pack has better safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1This is a schematic diagram of a lower box in an embodiment of the present application;

[0022] Figure 2 This is a partial exploded view of the lower box in one embodiment of the present application;

[0023] Figure 3 This is a cross-sectional view of a lower box in one embodiment of the present application;

[0024] Figure 4 for Figure 3 A magnified view of the middle part IV;

[0025] Figure 5 A schematic diagram of an energy absorbing component in one embodiment of the present application;

[0026] Figure 6 An exploded view of an energy absorbing component in one embodiment of the present application.

[0027] Icon: 100-lower box body; 110-bottom plate; 111-second reinforcement rib; 120-end plate; 130-side plate; 131-first reinforcement rib; 140-skirt; 150-energy absorbing assembly; 151-energy absorbing member; 1511-first plate body; 1512-second plate body; 1513-third plate body; 1514-sealing plate; 1515-cavity; 152-connecting member; 1521-first edge; 1522-second edge. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the prior art, since the lower case of the power battery pack is exposed on the chassis, if stones are splashed onto the outside of the lower case during driving, or if a protrusion on the ground collides with the outside of the lower case, the lower case may be deformed. In the prior art, the battery module or liquid cooling assembly is directly arranged on the inside of the lower case, so when the lower case is sunken inward due to external impact, important components such as the battery module and liquid cooling assembly will be compressed and damaged. It can be seen that the protection performance of the lower case of the existing battery pack is poor.

[0035] To this end, the present application provides a lower box, which absorbs deformation caused by external impact by arranging an energy absorption component on the inner side of the enclosure, so as to better protect the key components inside (such as battery modules and liquid cooling components). The present application also provides a battery pack, including the above-mentioned lower box.

[0036] Figure 1 This is a schematic diagram of a lower box 100 in an embodiment of the present application; Figure 2 This is a schematic diagram of an energy absorbing assembly 150 being taken out of a box in one embodiment of the present application; Figure 3 FIG. 1 is a cross-sectional view of the lower box 100 in one embodiment of the present application. Figures 1 to 3As shown, the lower box 100 provided in the embodiment of the present application is the lower box 100 of the battery pack, and specifically can be the lower box 100 of the power battery pack. The lower box 100 is used to accommodate the battery module, and further, can also accommodate other components matching the battery module (such as a liquid cooling component). The lower box 100 is used to protect the components such as the battery module inside it.

[0037] The lower box body 100 includes a box body and an energy absorbing assembly 150. The box body includes a bottom plate 110 and a surrounding plate connected to the bottom plate 110. The bottom plate 110 and the surrounding plate together form a accommodating cavity. The energy absorbing assembly 150 has a first side and a second side opposite to each other. The first side of the energy absorbing assembly 150 is connected to the inner wall surface of the surrounding plate, and the second side of the energy absorbing assembly 150 is used to abut the battery module. It can be seen that by providing the energy absorbing assembly 150, at least one side of the battery module can be separated from the surrounding plate. When the surrounding plate corresponding to the first side of the energy absorbing assembly 150 is deformed inwardly due to an external impact, the energy absorbing assembly 150 can absorb the inward deformation of the surrounding plate by deformation, thereby reducing the impact force received by important components such as the battery module, thereby playing a better protective role.

[0038] In the embodiment of the present application, the bottom plate 110 is rectangular, and the enclosure includes two end plates 120 spaced apart in a first direction A and two side plates 130 spaced apart in a second direction B, and the first direction A is perpendicular to the second direction B. In the present embodiment, the lower box 100 includes two energy absorbing components 150, and the inner wall surfaces of the two end plates 120 are respectively provided with an energy absorbing component 150. In a specific scenario, the battery pack is set on a car, and the first direction A corresponds to the front and rear direction of the car, that is, the driving direction. Then, the two end plates 120 spaced apart in the first direction A are more susceptible to impact by external foreign objects than the side plates 130, so the energy absorbing components 150 are respectively provided on the inner wall surfaces of the two end plates 120, which can more specifically protect the battery modules inside the lower box 100. The two side plates 130 are relatively less susceptible to impact, and the energy absorbing components 150 are not provided on their inner wall surfaces, which can reduce the space occupied by the energy absorbing components 150 and reduce the overall volume of the battery pack.

[0039] In other optional embodiments, an energy absorbing assembly 150 may be provided on the inner wall surface of one of the two end plates 120; or, an energy absorbing assembly 150 may be provided on the inner wall surface of at least one side plate 130, so as to improve the protective effect.

[0040] In this embodiment, the end plate 120 is an outwardly convex arc-shaped plate. By making the end plate 120 convex, a certain installation space can be provided for the energy absorption component 150; the energy absorption component 150 does not occupy or does not occupy too much of the space directly above the bottom plate 110 (this part of the space is used to set the battery module and the liquid cooling component). At the same time, when the outwardly convex structure is subjected to an external collision, because there will be a gap between the end plate 120 and the neatly arranged battery modules, even if the energy absorption component 150 is not provided, there will be a certain buffer space between the end plate 120 and the battery module, thereby reducing the risk of the battery module being damaged by the impact of the end plate 120 when the end plate 120 is deformed inward.

[0041] Specifically in this embodiment, the lower end of the end plate 120 is connected to the bottom plate 110, and the upper end forms a partial edge of the opening of the box. The upper end of the end plate 120 has a tendency to extend outward, so that the projection of the upper edge of the end plate 120 in the depth direction of the box (perpendicular to the first direction A and the second direction B) falls outside the bottom plate 110, that is, the opening of the box is in an outwardly open shape. This arrangement not only increases the space for installing the energy absorbing assembly 150, but also makes the outer surface of the end plate 120 tilted outward. When subjected to external lateral impact, the end plate 120 can disperse the impact force to a certain extent. For example, when a stone hits the outer side of the end plate 120 laterally along the first direction A, it will slide downward along the end plate 120, reducing the impact force of the end plate 120 in the first direction A.

[0042] Furthermore, the upper edge of the enclosure (including the end plate 120 and the side plate 130) is provided with a skirt 140, which extends outward from the upper edge of the enclosure. The skirt 140 may be provided with a plurality of mounting holes, and the skirt 140 may be fixed by fasteners such as screws, thereby fixing the lower box 100 and the battery pack. The skirt 140 can also improve the strength of the box to a certain extent.

[0043] Figure 4 for Figure 3 A magnified view of the middle part IV; Figure 5 A schematic diagram of an energy absorbing assembly 150 in one embodiment of the present application; Figure 6 FIG. 1 is an exploded view of an energy absorbing assembly 150 in one embodiment of the present application. Figures 4 to 6As shown, in the embodiment of the present application, the energy absorbing assembly 150 includes an energy absorbing member 151 and a connecting member 152. The energy absorbing member 151 is a hollow structure, and the energy absorbing member 151 is used to abut the battery module. The connecting member 152 is connected to the inner wall surface of the enclosure and the energy absorbing member 151. The energy absorbing member 151 is a hollow structure, so that when it is subjected to the impact caused by the deformation of the enclosure, it will also produce compression deformation, thereby absorbing a certain impact force and reducing the impact force transmitted to the battery module. Specifically in this embodiment, the connecting member 152 is connected between the end plate 120 and the energy absorbing member 151. Since the end plate 120 is a convex shape and its inner wall surface is an arc surface, it is not easy for the energy absorbing member 151 to directly fit the end plate 120 to maintain its relative position with the end plate 120. By providing the connecting member 152, the energy absorbing member 151 can be well fixed to the end plate 120.

[0044] Optionally, the end plate 120 and the connecting member 152 are both made of metal, such as sheet metal, and the end plate 120 and the connecting member 152 are connected by welding. In other embodiments, the end plate 120 and the connecting member 152 can also be connected by bonding, or by fasteners such as screws; or even by abutting.

[0045] In this embodiment, the energy absorbing member 151 includes a first plate 1511, a second plate 1512 and a third plate 1513 which together form a cavity 1515. The outer side of the first plate 1511 is used to abut the battery module. The connecting member 152 is connected to the outer surface of the second plate 1512. The third plate 1513 is located on the side of the energy absorbing member 151 away from the bottom plate 110. In this embodiment, the energy absorbing member 151 is in the shape of a triangular prism as a whole. The cross section of the cavity 1515 of the energy absorbing member 151 is a triangle, specifically a right triangle. The first plate 1511 and the third plate 1513 are perpendicular to each other, and the third plate 1513 is parallel to the bottom plate 110 and is roughly flush with the opening of the box. The first plate 1511 is perpendicular to the bottom plate 110. The first plate 1511 is opposite to the edge of the bottom plate 110 in the depth direction of the box, that is, it does not occupy (or does not occupy too much) the space directly above the first plate 1511. At the same time, the first plate 1511 is perpendicular to the bottom plate 110, so that the first plate 1511, the side plate 130 and the bottom plate 110 together form a rectangular space to accommodate the battery module, which fits the overall shape of the battery module, so that the battery module and the energy absorption assembly 150 can be compactly arranged in the box.

[0046] In this embodiment, the second plate 1512 extends obliquely toward the upper edge of the end plate 120. Since the second plate 1512 is a flat plate, a gap is formed between the second plate 1512 and the arc-shaped end plate 120, and the connector 152 is located in the gap and connects the second plate 1512 and the end plate 120. The material of the energy absorbing member 151 can be metal, such as formed by sheet metal welding. The second plate 1512 and the connector 152 can be connected by welding, bonding or screw connection. The energy absorbing component 150, the enclosure and other structures are made of metal material, so that they have a certain strength, and a slight impact will not cause deformation, and will not transmit impact force to the battery module, and can also increase the stability of the overall structure of the battery pack; at the same time, the use of metal materials also achieves better thermal conductivity. In this embodiment, the entire box is cast in one piece using aluminum alloy. In other optional embodiments, the enclosure and the energy absorbing component 150 can also be made of other materials.

[0047] In this embodiment, the energy absorbing member 151 further includes two sealing plates 1514, and two openings of the cavity 1515 surrounded by the first plate body 1511, the second plate body 1512 and the third plate body 1513 in the second direction B are respectively blocked by the two sealing plates 1514. In this embodiment, the shape of the two sealing plates 1514 is adapted to the cross-sectional shape of the cavity 1515 of the energy absorbing member 151, and is a triangle.

[0048] In the present embodiment, the connecting member 152 is plate-shaped, and the connecting member 152 has a first edge 1521 and a second edge 1522, the first edge 1521 is an arc edge adapted to the inner wall surface of the end plate 120 and connected to the inner wall surface of the end plate 120, and the second edge 1522 is connected to the energy absorbing member 151. Further, the energy absorbing assembly 150 includes a plurality of connecting members 152, and the plurality of connecting members 152 are arranged at intervals in the second direction B. In the present embodiment, each energy absorbing assembly 150 includes three connecting members 152. The plurality of connecting members 152 can increase the strength of the end plate 120, and the plurality of connecting members 152 divide the large cavity between the second plate body 1512 and the end plate 120 into a plurality of small cavities to avoid being destroyed as a whole after being damaged.

[0049] The function of the energy absorbing member 151 is to absorb external impact force by its own deformation. In this embodiment, its cross section is set to be triangular in order to adapt to the "open" shape of the end plate 120 and reduce space occupation. In other embodiments, the cross-sectional shape of the energy absorbing member 151 can be other shapes other than the above embodiments, such as rectangular, fan-shaped, etc.

[0050] Please continue reading Figures 1 to 3In this embodiment, a first reinforcing rib 131 is provided on the side plate 130. By providing the first reinforcing rib 131, the strength of the side plate 130 can be improved. Further, a second reinforcing rib 111 is provided on the bottom plate 110. By providing the second reinforcing rib 111 on the bottom plate 110, the bending resistance of the bottom plate 110 can be improved, so as to better carry the battery module. Optionally, the first reinforcing rib 131 and the second reinforcing rib 111 can be formed by a stamping process, and the second reinforcing rib 111 protrudes to the outside of the accommodating cavity. The stamping process forms the reinforcing rib, which is more efficient; the second reinforcing rib 111 protrudes to the outside of the accommodating cavity, so as to avoid the second reinforcing rib 111 occupying the space in the box, and facilitate the placement of the battery module and the liquid cooling component. In addition, when the bottom plate 110 is facing an impact, the convex second reinforcing rib 111 can absorb the deformation to a certain extent, thereby reducing the impact force transmitted to the battery module by the bottom plate 110, so as to better protect the components in the lower box 100.

[0051] Optionally, the first reinforcing rib 131 extends along the depth direction of the box body, and the stamping length of the first reinforcing rib 131 can be set according to actual conditions, such as 30%-60% of the height of the side plate 130 .

[0052] In this embodiment, the second reinforcing ribs 111 form a columnar cavity. A plurality of second reinforcing ribs 111 are arranged in a staggered manner on the bottom plate 110 . The second reinforcing ribs 111 extend along the first direction A.

[0053] The battery pack (not shown) provided in the embodiment of the present application includes a battery module and the lower box 100 provided in the above embodiment, and the battery module is arranged in the accommodating cavity of the lower box 100. Specifically in this embodiment, the battery module is arranged in a space surrounded by the bottom plate 110, the side plate 130 and the energy absorption assembly 150.

[0054] In summary, the lower box 100 provided in the embodiment of the present application includes a box and an energy absorbing assembly 150. The box includes a bottom plate 110 and a surrounding plate connected to the bottom plate 110. The bottom plate 110 and the surrounding plate together form a receiving cavity. The energy absorbing assembly 150 has a first side and a second side opposite to each other. The first side of the energy absorbing assembly 150 is connected to the inner wall surface of the surrounding plate, and the second side of the energy absorbing assembly 150 is used to abut the battery module. The energy absorbing assembly 150 includes an energy absorbing member 151 and a connecting member 152. The energy absorbing member 151 is a hollow structure. The energy absorbing member 151 is used to abut the battery module. The connecting member 152 is connected to the inner wall surface of the surrounding plate and the energy absorbing member 151. Since the energy absorbing assembly 150 is arranged between the enclosure and the battery module, and the energy absorbing member 151 of the energy absorbing assembly 150 is a hollow structure, when the outer side of the enclosure is hit, even if the enclosure is deformed to a certain extent, the energy absorbing member 151 can absorb the deformation of the enclosure, thereby avoiding damage to the battery module or liquid cooling assembly in the lower box 100. Therefore, the lower box 100 provided in the embodiment of the present application has better protection performance.

[0055] The battery pack provided in the embodiment of the present application includes a battery module and the above-mentioned lower box 100, and the battery pack has better safety.

[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lower box for accommodating a battery module, characterized in that: The invention comprises a box body and an energy absorbing component (150), wherein the box body comprises a bottom plate (110) and a surrounding plate connected to the bottom plate (110), wherein the bottom plate (110) and the surrounding plate together form a containing cavity, and the energy absorbing component (150) has a first side and a second side opposite to each other, wherein the first side of the energy absorbing component (150) is connected to the inner wall surface of the surrounding plate, and the second side of the energy absorbing component (150) is used to abut against a battery module; The energy absorbing component (150) comprises an energy absorbing member (151) and a connecting member (152); the energy absorbing member (151) is a hollow structure; the energy absorbing member (151) is used to abut against the battery module; and the connecting member (152) is connected to the inner wall surface of the enclosure and the energy absorbing member (151).

2. The lower box according to claim 1, characterized in that: The energy absorbing member (151) comprises a first plate body (1511), a second plate body (1512) and a third plate body (1513) which together enclose a cavity (1515); the outer side of the first plate body (1511) is used to abut against the battery module; the connecting member (152) is connected to the outer surface of the second plate body (1512); and the third plate body (1513) is located on a side of the energy absorbing member (151) away from the bottom plate (110).

3. The lower box according to claim 2, characterized in that: The energy absorbing member (151) further comprises two sealing plates (1514); the cavity (1515) has two openings, and the two openings are blocked by the two sealing plates (1514).

4. The lower box according to claim 1, characterized in that: The bottom plate (110) is rectangular, and the enclosure includes two end plates (120) spaced apart in a first direction and two side plates (130) spaced apart in a second direction, the first direction is perpendicular to the second direction, and the energy absorbing component (150) is provided on the inner wall surface of at least one of the two end plates (120).

5. The lower box according to claim 4, characterized in that: The end plate (120) is an outwardly convex arc-shaped plate.

6. The lower box according to claim 5, characterized in that: The connecting member (152) is plate-shaped and has a first edge (1521) and a second edge (1522). The first edge (1521) is an arc edge adapted to the inner wall surface of the end plate (120) and connected to the inner wall surface of the end plate (120), and the second edge (1522) is connected to the energy absorbing member (151).

7. The lower box according to claim 5, characterized in that: The energy absorbing component (150) comprises a plurality of connecting members (152), and the plurality of connecting members (152) are arranged at intervals in the second direction.

8. The lower box according to claim 4, characterized in that: The side plate (130) is provided with a first reinforcing rib (131).

9. The lower box according to any one of claims 1 to 8, characterized in that: The bottom plate (110) is provided with a second reinforcing rib (111).

10. A battery pack, characterized in that: It comprises a battery module and a lower box (100) according to any one of claims 1 to 9, wherein the battery module is arranged in a receiving cavity of the lower box (100).

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