Box body and battery pack

Abstract

The utility model relates to the technical field of battery packs, and particularly discloses a box body and a battery pack, the box body comprises a box main body and a cover plate, the box main body is provided with an accommodating cavity with a first opening, the cover plate can be buckled on the first opening to realize the sealing of the accommodating cavity, the box main body is provided with a first mounting hole, and the cover plate can be buckled on the first opening to realize the sealing of the accommodating cavity. A detachable connecting piece is arranged on the cover plate, a second mounting hole is formed in the connecting piece, when the connecting piece is mounted on the cover plate, the second mounting hole corresponds to the first mounting hole, and a fastener can be inserted into a communicating hole of the first mounting hole and the second mounting hole so as to lock the cover plate and the box main body; due to the fact that the connecting piece is detachably arranged on the cover plate, the connecting piece and the cover plate do not need to be integrally formed, the difficulty of independent forming is low, the mold structure is simple, and the cost can be greatly reduced on the premise that the connecting strength is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery pack, especially a box body and battery pack. BACKGROUND

[0002] With the rapid development of new energy technology, portable energy storage devices (such as battery packs) are widely used in electric vehicles, outdoor power sources and other fields. A battery pack generally includes a battery module and a box body. The battery module is usually packaged in the box body, and the box body provides protection for the battery module. The existing box body usually includes a box main body and a front cover. An accommodating cavity for accommodating multiple battery modules is arranged on the box main body. After the battery modules are assembled into the accommodating cavity, the front cover is fastened at the opening of the accommodating cavity to achieve sealing of the accommodating cavity.

[0003] In the prior art, the handle is generally installed on the front cover. When the battery pack is lifted by the handle, the front cover needs to bear force. Therefore, the connection strength between the front cover and the box main body needs to be ensured. Usually, a nut is fixed in the inner side of the front cover by a sheet metal part. A corresponding screw hole is arranged on the box main body. The screw rod passes through the screw hole and engages with the nut. In order to ensure the stability of the connection, the sheet metal part is usually integrally formed with the front cover. However, this undoubtedly increases the difficulty of forming and requires a more complex mold, which increases the cost. SUMMARY

[0004] The utility model considers the foregoing problem and is made. The purpose of the utility model is to provide a box body and a battery pack, which can effectively reduce the production difficulty of the box body and reduce the production cost under the premise of ensuring the connection strength of the box body.

[0005] To achieve the above-mentioned purpose, the utility model provides a box body, which comprises:

[0006] The box main body is provided with an accommodating cavity with a first opening;

[0007] The cover plate can be fastened on the first opening to seal the accommodating cavity;

[0008] The box main body is provided with a first mounting hole, the cover plate is provided with a detachable connecting piece, the connecting piece is provided with a second mounting hole, when the connecting piece is installed on the cover plate, the second mounting hole corresponds to the first mounting hole, and a fastener can be inserted into the communication hole between the first mounting hole and the second mounting hole to lock the cover plate and the box main body.

[0009] According to the above-mentioned box body, the cover plate is provided with a clamping structure, and the connecting piece is clamped and matched with the clamping structure.

[0010] The box according to the preceding description, the clamping structure comprises two clamping blocks arranged oppositely, and the opposite sides of the two clamping blocks are respectively provided with clamping grooves, and the two sides of the connecting piece can be clamped into the two clamping grooves respectively.

[0011] The box according to the preceding description, the connecting piece comprises a sheet metal piece and a first nut fixed on the sheet metal piece, the two sides of the sheet metal piece can be clamped into the two clamping grooves respectively, and the first nut is located between the two clamping blocks.

[0012] The box according to the preceding description, the two sides of the sheet metal piece are respectively provided with positioning protrusions, and the positioning protrusions are in interference fit with the two clamping grooves.

[0013] The box according to the preceding description, the first mounting hole and the second mounting hole are both threaded holes, the second mounting hole is located on the first nut, and the sheet metal piece and the cover plate are both provided with first through holes for connecting the first mounting hole and the second mounting hole.

[0014] The box according to the preceding description, the first mounting hole and the connecting piece are both provided with a plurality of first mounting holes and connecting pieces, and the plurality of first mounting holes are arranged on the top and two sides of the box body in a spaced manner, and the plurality of connecting pieces are arranged on the top and two sides of the cover plate in a spaced manner.

[0015] The plurality of connecting pieces are all provided with the second mounting hole, and the plurality of second mounting holes correspond to the plurality of first mounting holes one by one.

[0016] The box according to the preceding description, the box body comprises a bottom plate and an upper cover buckled on the bottom plate, the bottom plate at the first opening is provided with a screw rod, the bottom of the cover plate is provided with a positioning groove, the positioning groove is provided with a second opening, the screw rod can slide into the positioning groove along the second opening, and the screw rod can be matched with a second nut to clamp the bottom of the cover plate.

[0017] The box according to the preceding description, the screw rod and the positioning groove are both provided with a plurality of screw rods and positioning grooves, the plurality of screw rods are arranged on the bottom plate in a spaced manner, the plurality of positioning grooves are arranged on the bottom of the cover plate in a spaced manner and correspond to the plurality of screw rods one by one.

[0018] A battery pack comprises

[0019] The box according to the preceding description, the box is provided with a handle, and the handle is fixed to the outer side of the cover plate.

[0020] A battery module, and a plurality of battery modules are located in the accommodating cavity of the box.

[0021] The utility model has the following beneficial effects:

[0022] 1、The first mounting hole is arranged on the box body, the detachable connecting piece is arranged on the cover plate, the second mounting hole corresponding to the first mounting hole is arranged on the connecting piece, and the locking of the cover plate and the box body is realized by inserting the fastener into the communication hole of the first mounting hole and the second mounting hole. Since the connecting piece is detachably arranged on the cover plate, the connecting piece does not need to be integrally formed with the cover plate, the forming difficulty can be reduced, the mold structure is simpler, and the cost can be saved;

[0023] 2、The positioning protrusions are arranged on both sides of the sheet metal part, the two positioning protrusions are matched with the two clamping grooves to form an interference fit, the connection and fixation of the sheet metal part are more stable, the shaking of the sheet metal part does not affect the assembly of the box body and the cover plate, and the connection strength is ensured;

[0024] 3、The plurality of spaced-apart studs are arranged at the opening of the bottom plate, and the positioning grooves corresponding to the studs are arranged on the cover plate, so that when the cover plate is installed, the cover plate only needs to be pushed towards the side close to the box body, and the studs and the positioning grooves can be used for preliminary positioning, and the assembly precision is higher. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the overall appearance of the embodiment;

[0026] Figure 2 is a schematic view of the box body structure of the embodiment;

[0027] Figure 3 is a schematic view of the assembly of the battery module, the bottom plate and the cover plate of the embodiment;

[0028] Figure 4 is a schematic view of the assembly of the bottom plate and the cover plate of the embodiment;

[0029] Figure 5 is an enlarged view of A of Figure 4

[0030] Figure 6 is a schematic view of the structure of the sheet metal part of the embodiment.

[0031] In the drawings:

[0032] 100, box body; 110, box body; 111, containing cavity; 111a, first opening; 112, first mounting hole; 113, bottom plate; 113a, screw rod; 114, upper cover; 120, cover plate; 121, connecting piece; 121a, second mounting hole; 121b, sheet metal part; 121c, first nut; 121d, positioning protrusion; 121e, first through hole; 122, clamping block; 122a, clamping groove; 123, positioning groove; 130, handle;

[0033] 200, battery module. DETAILED DESCRIPTION ​

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] like Figures 1-6 As shown, a battery pack includes a housing 100 and a plurality of battery modules 200 located within the housing 100.

[0036] One type of enclosure includes a main body 110 and a cover plate 120. The main body 110 has a receiving cavity 111 with a first opening 111a. Several battery modules are located in the receiving cavity 111. The cover plate 120 can be fastened to the first opening 111a to seal the receiving cavity 111. After sealing, it can provide protection for the battery modules 200 located in the receiving cavity 111.

[0037] To facilitate lifting the battery pack, a handle 130 is usually provided on the housing 100. The handle 130 is located on the cover plate 120. In this embodiment, there are two handles 130, which are symmetrically arranged at both ends of the cover plate 120 to facilitate lifting with both hands. Since the handles 130 are located on the cover plate 120, the cover plate 120 needs to withstand a large force load when the battery pack is driven by the handles 130. Therefore, the connection strength between the cover plate 120 and the housing body 110 must be high.

[0038] In the existing technology, a sheet metal part needs to be integrally formed on the cover plate, and a nut is set on the sheet metal part. A corresponding mounting hole is set on the box body. The nut and the mounting hole are connected by bolts to realize the connection between the cover plate and the box body. However, since the cover plate and the sheet metal part need to be integrally formed, a two-color injection molding machine is required. The mold structure is also relatively complex and the cost is high. In addition, the nut on the cover plate and the mounting hole on the box body need to be manually adjusted to correspond and manually supported, which makes the assembly more troublesome.

[0039] In this embodiment, a first mounting hole 112 is provided on the box body 110, and a detachable connector 121 is provided on the cover plate 120. The connector 121 is provided with a second mounting hole 121a. When the connector 121 is installed on the cover plate 120, the second mounting hole 121a corresponds to the first mounting hole 112, and a fastener can be inserted into the communicating hole between the first mounting hole 112 and the second mounting hole 121a to lock the cover plate 120 and the box body 110. Since the connector 121 is detachably set on the cover plate 120, it does not need to be integrally formed with the cover plate 120, and the difficulty of forming it separately is greatly reduced. Moreover, the mold structure is relatively simple, and the cost can be greatly reduced without affecting the connection strength.

[0040] In the embodiment, in order to realize the detachable connection of the connecting piece 121 and the cover plate 120, a clamping structure is arranged on the cover plate 120, the connecting piece 121 is clamped with the clamping structure, and after clamping, the fixing of the connecting piece 121 can be realized. When it is needed to disassemble the connecting piece 121, it only needs to be taken out from the clamping structure.

[0041] Of course, in addition to the clamping connection mode, various detachable connection modes such as threaded connection can also be adopted, which should not exceed the scope of the application.

[0042] Specifically, the clamping structure includes two clamping blocks 122 arranged oppositely, and the opposite sides of the two clamping blocks 122 are respectively provided with clamping grooves 122a. The two sides of the connecting piece 121 can be respectively clamped into the two clamping grooves 122a, that is, the two clamping blocks 122 form a limiting groove with an opening in the middle. The connecting piece 121 can be driven from top to bottom to be clamped into the two clamping grooves 122a, and the middle part is exposed outside the clamping groove 122a, which is convenient for the insertion of the fastener and avoids the interference of the clamping block 122 to the fastener.

[0043] Specifically, the connecting piece 121 includes a metal piece 121b and a first nut 121c fixed on the metal piece 121b. The two sides of the metal piece 121b can be respectively clamped into the two clamping grooves 122a, and the first nut 121c is located between the two clamping blocks 122. The metal piece 121b provides support and positioning for the first nut 121c. In order to improve the stability of the positioning, the two sides of the metal piece 121b are respectively provided with positioning protrusions 121d. The metal piece 121b can be interference-fitted with the two clamping grooves 122a through the two positioning protrusions 121d, which can avoid the shaking of the metal piece 121b and the first nut 121c, thereby ensuring the stability of the connection.

[0044] In the embodiment, the interference fit refers to that the distance between the outermost sides of the two positioning protrusions 121d is greater than the distance between the groove bottoms of the two clamping grooves 122a, so that the reset force of the clamping block 122 can clamp the two positioning protrusions 121d, thereby improving the stability of the clamping of the metal piece 121b.

[0045] In the actual assembly process, the positioning protrusions 121d on the two sides of the metal piece 121b can be aligned with the clamping grooves 122a of the cover plate 120, and then pressed downward until the two sides of the metal piece 121b are completely inserted into the metal piece 121b. At this time, the groove bottoms of the clamping grooves 122a also form clamping of the two positioning protrusions 121d.

[0046] In order to realize the connection of the cover plate 120 and the box body 110, the first mounting hole 112 and the second mounting hole 121a are provided as threaded holes, and the second mounting hole 121a is located on the first nut 121c, and the sheet metal part 121b and the side wall of the cover plate 120 are located between the first mounting hole 112 and the second mounting hole 121a, so that the first through hole 121e for communicating the first mounting hole 112 and the second mounting hole 121a is provided on the sheet metal part 121b and the cover plate 120. The first through hole 121e is provided to facilitate the passage of the fastener. In the embodiment, the fastener is provided as a bolt, one end of the bolt is located on the outside of the box body 110, and the other end of the bolt can pass through the first mounting hole 112, the two first through holes 121e and the second mounting hole 121a to be threadedly engaged, so as to realize the connection of the cover plate 120 and the box body 110.

[0047] Among them, the sheet metal part 121b can also act as a gasket to disperse stress and prevent the cover plate 120 from deforming.

[0048] In order to improve the strength of the sheet metal part 121b, the sheet metal part 121b can be made of aluminum alloy material and subjected to surface oxidation and polishing treatment. It has high strength and is not easy to deform. Its greatest advantage is that it is light in weight and has good corrosion resistance. It can be applied to new energy automobile battery packs, which need to reduce weight and improve endurance, and because it needs to contact the battery module, it also has high requirements for corrosion resistance.

[0049] In order to ensure the stability of the connection, the first mounting hole 112 and the connecting part 121 are provided with a plurality of first mounting holes 112 arranged at intervals on the top and both sides of the box body 110, and a plurality of connecting parts 121 arranged at intervals on the top and both sides of the cover plate 120, and the plurality of connecting parts 121 are provided with the second mounting hole 121a, and the plurality of second mounting holes 121a correspond to the plurality of first mounting holes 112 one by one. A plurality of connecting parts 121 and a plurality of first mounting holes 112 are used to realize the multi-point connection between the cover plate 120 and the box body 110, and the multi-point can be stressed to ensure the stability of the connection, and the cover plate 120 and the box body 110 are fixed from three sides at the same time.

[0050] Specifically, the box body 110 includes a bottom plate 113 and an upper cover 114 buckled on the bottom plate 113, a screw rod 113a is arranged on the bottom plate 113 at the first opening 111a, a positioning groove 123 is arranged at the bottom of the cover plate 120, and a second opening is arranged on the positioning groove 123, the screw rod 113a can slide into the positioning groove 123 along the second opening, and can be matched with a second nut to clamp the bottom of the cover plate 120, so that in the overall assembly process of the box body 100, the cover plate 120 can be first pressed inward, the screw rod 113a and the positioning groove 123 are used as a guide, and after the positioning groove 123 and the screw rod 113a are matched, the cover plate 120 is only needed to be pressed inward to realize the alignment of the first mounting hole 112 and the second mounting hole 121a, and after the pressing is completed, since the upper cover 114 has not been packaged, the second nut can be assembled on the screw rod 113a from the upper part, the bottom of the cover plate 120 is clamped and positioned by the cooperation of the second nut and the screw rod 113a, then the upper cover 114 is installed, and the bolt positioning of the top and the two sides of the cover plate 120 is performed, so that the assembly is simpler and the assembly precision is high.

[0051] Wherein, through the cooperation of the positioning groove 123 and the screw rod 113a, the first mounting hole 112 and the second mounting hole 121a do not need to be manually aligned during assembly, and the operation difficulty is reduced.

[0052] Similarly, in order to ensure the stability of the connection, a plurality of screw rods 113a and positioning grooves 123 are arranged, the plurality of screw rods 113a are arranged on the bottom plate 113 at intervals, the plurality of positioning grooves 123 are arranged at the bottom of the cover plate 120 at intervals and correspond to the plurality of screw rods 113a one by one, and the connection and fixation are performed at multiple points at the same time, which helps to improve the stability of the connection.

[0053] In the embodiment, the upper cover 114 can be connected with the bottom plate 113 in a buckling or bolt connection manner, waterproof structures can be arranged at the edges of the upper cover 114, and reinforcing ribs can be arranged on the upper cover 114 to improve the rigidity strength.

[0054] In the embodiment, the box body 100 and the battery pack can be applied to electric vehicles, household energy storage systems, special vehicles and many other fields.

[0055] The technical scheme of the utility model is described in detail above in combination with the drawings, and the described embodiments are used to help understand the idea of the utility model. The specific embodiments described in this paper are only examples of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

[0056] It should be noted that all directional indications (such as upper, lower, left, right, front, rear, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0057] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0058] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

Claims

1. A case characterized by comprising: The utility model relates to a box body with a containing cavity with a first opening, a cover plate that can be buckled on the first opening to seal the containing cavity, a first mounting hole on the box body, a detachable connecting piece on the cover plate, a second mounting hole on the connecting piece, the second mounting hole corresponding to the first mounting hole when the connecting piece is mounted on the cover plate, and a fastener inserted into the communication hole of the first mounting hole and the second mounting hole to lock the cover plate and the box body. The cover plate is provided with a clamping structure, and the connecting piece is clamped with the clamping structure. The clamping structure includes two clamping blocks arranged oppositely, and each side of the two clamping blocks opposite to each other is provided with a clamping groove, and the two sides of the connecting piece can be clamped into the two clamping grooves respectively. The connecting piece includes a sheet metal piece and a first nut fixed on the sheet metal piece, the two sides of the sheet metal piece can be clamped into the two clamping grooves respectively, and the first nut is located between the two clamping blocks.

2. A box according to claim 1, wherein The two sides of the sheet metal piece are provided with positioning protrusions, and the positioning protrusions are in interference fit with the two clamping grooves.

3. A box according to claim 2, wherein The first mounting hole and the second mounting hole are both threaded holes, the second mounting hole is located on the first nut, and the sheet metal piece and the cover plate are both provided with a first through hole for communicating the first mounting hole and the second mounting hole.

4. A box according to claim 3, wherein The first mounting hole and the connecting piece are both provided with a plurality of first mounting holes arranged at the top and both sides of the box body, and a plurality of connecting pieces arranged at the top and both sides of the cover plate.

5. A box according to claim 4, wherein The second mounting hole is provided on the connecting piece, and the second mounting hole corresponds to the first mounting hole.

6. A box according to claim 4, wherein The box body includes a bottom plate and an upper cover buckled on the bottom plate, the bottom plate at the first opening is provided with a screw rod, the bottom of the cover plate is provided with a positioning groove, the positioning groove is provided with a second opening, the screw rod can slide into the positioning groove along the second opening, and the screw rod can be matched with a second nut to clamp the bottom of the cover plate.

7. A box according to claim 1 or 3, wherein The screw rod and the positioning groove are both provided with a plurality of screw rods arranged at the bottom plate and a plurality of positioning grooves arranged at the bottom of the cover plate and corresponding to the plurality of screw rods. The utility model relates to a box body with a containing cavity with a first opening, a cover plate that can be buckled on the first opening to seal the containing cavity, a first mounting hole on the box body, a detachable connecting piece on the cover plate, a second mounting hole on the connecting piece, the second mounting hole corresponding to the first mounting hole when the connecting piece is mounted on the cover plate, and a fastener inserted into the communication hole of the first mounting hole and the second mounting hole to lock the cover plate and the box body.

8. A box according to claim 7, wherein The cover plate is provided with a clamping structure, and the connecting piece is clamped with the clamping structure.

9. A box according to claim 8, wherein, The clamping structure includes two clamping blocks arranged oppositely, and each side of the two clamping blocks opposite to each other is provided with a clamping groove, and the two sides of the connecting piece can be clamped into the two clamping grooves respectively.

10. A battery pack, characterized by, The connecting piece includes a sheet metal piece and a first nut fixed on the sheet metal piece, the two sides of the sheet metal piece can be clamped into the two clamping grooves respectively, and the first nut is located between the two clamping blocks. The two sides of the sheet metal piece are provided with positioning protrusions, and the positioning protrusions are in interference fit with the two clamping grooves. The first mounting hole and the second mounting hole are both threaded holes, the second mounting hole is located on the first nut, and the sheet metal piece and the cover plate are both provided with a first through hole for communicating the first mounting hole and the second mounting hole. The first mounting hole and the connecting piece are both provided with a plurality of first mounting holes arranged at the top and both sides of the box body, and a plurality of connecting pieces arranged at the top and both sides of the cover plate. The second mounting hole is provided on the connecting piece, and the second mounting hole corresponds to the first mounting hole. The box body includes a bottom plate and an upper cover buckled on the bottom plate, the bottom plate at the first opening is provided with a screw rod, the bottom of the cover plate is provided with a positioning groove, the positioning groove is provided with a second opening, the screw rod can slide into the positioning groove along the second opening, and the screw rod can be matched with a second nut to clamp the bottom of the cover plate. The screw rod and the positioning groove are both provided with a plurality of screw rods arranged at the bottom plate and a plurality of positioning grooves arranged at the bottom of the cover plate and corresponding to the plurality of screw rods. The utility model relates to a box body with a containing cavity with a first opening, a cover plate that can be buckled on the first opening to seal the containing cavity, a first mounting hole on the box body, a detachable connecting piece on the cover plate, a second mounting hole on the connecting piece, the second mounting hole corresponding to the first mounting hole when the connecting piece is mounted on the cover plate, and a fastener inserted into the communication hole of the first mounting hole and the second mounting hole to lock the cover plate and the box body. The cover plate is provided with a clamping structure, and the connecting piece is clamped with the clamping structure. The clamping structure includes two clamping blocks arranged oppositely, and each side of the two clamping blocks opposite to each other is provided with a clamping groove, and the two sides of the connecting piece can be clamped into the two clamping grooves respectively. The connecting piece includes a sheet metal piece and a first nut fixed on the sheet metal piece, the two sides of the sheet metal piece can be clamped into the two clamping grooves respectively, and the first nut is located between the two clamping blocks. The two sides of the sheet metal piece are provided with positioning protrusions, and the positioning protrusions are in interference fit with the two clamping grooves. The first mounting hole and the second mounting hole are both threaded holes, the second mounting hole is located on the first nut, and the sheet metal piece and the cover plate are both provided with a first through hole for communicating the first mounting hole and the second mounting hole. The first mounting hole and the connecting piece are both provided with a plurality of first mounting holes arranged at the top and both sides of the box body, and a plurality of connecting pieces arranged at the top and both sides of the cover plate. The second mounting hole is provided on the connecting piece, and the second mounting hole corresponds to the first mounting hole. The box body includes a bottom plate and an upper cover buckled on the bottom plate, the bottom plate at the first opening is provided with a screw rod, the bottom of the cover plate is provided with a positioning groove, the positioning groove is provided with a second opening, the screw rod can slide into the positioning groove along the second opening, and the screw rod can be matched with a second nut to clamp the bottom of the cover plate. The screw rod and the positioning groove are both provided with a plurality of screw rods arranged at the bottom plate and a plurality of positioning grooves arranged at the bottom of the cover plate and corresponding to the plurality of screw rods. The utility model relates to a box body with a containing cavity with a first opening, a cover plate that can be buckled on the first opening to seal the containing cavity, a first mounting hole on the box body, a detachable connecting piece on the cover plate, a second mounting hole on the connecting piece, the second mounting hole corresponding to the first mounting hole when the connecting piece is mounted on the cover plate, and a fastener inserted into the communication hole of the first mounting hole and the second mounting hole to lock the cover plate and the box body. The cover plate is provided with a clamping structure, and the connecting piece is clamped with the clamping structure. The clamping structure includes two clamping blocks arranged oppositely, and each side of the two clamping blocks opposite to each other is provided with a clamping groove, and the two sides of the connecting piece can be clamped into the two clamping grooves respectively. The connecting piece includes a sheet metal piece and a first nut fixed on the sheet metal piece, the two sides of the sheet metal piece can be clamped into the two clamping grooves respectively, and the first nut is located between the two clamping blocks. The two sides of the sheet metal piece are provided with positioning protrusions, and the positioning protrusions are in interference fit with the two clamping grooves. The first mounting hole and the second mounting hole are both threaded holes, the second mounting hole is located on the first nut, and the sheet metal piece and the cover plate are both provided with a first through hole for communicating the first mounting hole and the second mounting hole. The first mounting hole and the connecting piece are both provided with a plurality of first mounting holes arranged at the top and both sides of the box body, and a plurality of connecting pieces arranged at the top and both sides of the cover plate. The second mounting hole is provided on the connecting piece, and the second mounting hole corresponds to the first mounting hole. The box body includes a bottom plate and an upper cover buckled on the bottom plate, the bottom plate at the first opening is provided with a screw rod, the bottom

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