Battery Box

Abstract

The utility model discloses a battery box for accommodating a plurality of single cells, wherein the plurality of single cells are stacked in a direction perpendicular to the main surface thereof, the battery box comprises a plurality of plates, the plates are surrounded together to form an inner cavity, the inner cavity is used to accommodate a plurality of single cells, one of the plates arranged opposite to the main surface is fixedly arranged, another plate arranged opposite to the main surface is provided with a sliding block, other plates connected to the plate provided with the sliding block are provided with a slide groove, the slide groove is extended in a direction perpendicular to the main surface, the sliding block can be slidably arranged in the slide groove, so that the plate provided with the sliding block can apply a pre-tightening force to the plurality of single cells. Through the above arrangement, compared with the one-piece molding method, the production of customized molds can be omitted, and a plurality of plates can be stored and installed separately, and when one of the plates is damaged or has problems, it can be allowed to be replaced or repaired separately, thereby reducing the mold opening cost of the battery box, reducing the occupied space and the overall scrap rate.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery box. Background Art

[0002] At present, the production of battery boxes requires stacking the cells first, and then fixing them with end plates, side plates and strapping tapes to form a battery module, which is then placed in the box. However, the battery boxes manufactured using conventional technical means are large in size, resulting in low energy density and complex grouping methods, which greatly affects the performance of the battery boxes.

[0003] In response to the above problems, the patent with publication number CN113193297A provides a battery pack, in which the fixed plate, box frame and bottom plate together form a chamber, so that multiple stacked battery cells can be placed in the chamber. Through the above arrangement, the battery pack can be made without a module structure, directly from the battery cell to the PACK, omitting the module-related parts such as the end plate, side plate and strapping tape in the traditional battery pack, and placing the battery cell directly into the box, thereby reducing the volume of the battery box and simplifying the grouping method. However, the one-piece molding of the above-mentioned box frame will result in high mold costs for the box frame, large space occupation, and high overall scrap rate.

[0004] Based on the above, there is an urgent need for a battery box to solve the technical problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a battery box which can reduce production costs, occupy less space and overall scrap rate.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A battery box for accommodating a plurality of single cells, wherein the plurality of single cells are stacked in a direction perpendicular to their main surfaces, wherein the battery box comprises a plurality of panels, wherein the panels comprise a bottom plate, a box cover and a plurality of side plates, wherein the bottom plate, the box cover and the plurality of side plates are detachably connected and can together surround an inner cavity, wherein the inner cavity is used to accommodate the plurality of single cells, wherein one of the panels arranged opposite to the main surface is fixedly arranged, and another panel arranged opposite to the main surface is provided with a sliding block, and other panels connected to the panel provided with the sliding block are provided with a sliding groove, wherein the sliding groove extends in a direction perpendicular to the main surface, and the sliding block can be slidably arranged in the sliding groove so that the panel provided with the sliding block can apply a pre-tightening force to the plurality of single cells.

[0008] Optionally, the single cells are stacked along a first horizontal direction, and along the first horizontal direction, at least one first side edge of the bottom plate opposite to the bottom plate is provided with the slide groove, and the side plate opposite to the slide groove is provided with the slide block.

[0009] Optionally, along the horizontal first direction, two first side edges of the bottom plate that are arranged opposite to each other are provided with the sliding groove;

[0010] The side panels include a front side panel, a rear side panel, a left side panel and a right side panel, the left side panel and the right side panel are arranged opposite to each other along the first horizontal direction, the left side panel and the right side panel are both provided with the sliding blocks, the sliding blocks are arranged in a one-to-one correspondence on the sliding grooves, and the left side panel and the right side panel are each provided with two first clamping blocks along the second horizontal direction, a clamping groove is opened on the first clamping block along the second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction;

[0011] Two second clamping blocks are respectively arranged on the front side plate and the rear side plate along the horizontal first direction, and the second clamping blocks can be slidably inserted into the clamping slots to achieve detachable connection between the plurality of side plates.

[0012] Optionally, along the horizontal second direction, limiting grooves are respectively provided on two second side edges opposite to each other of the bottom plate, and a limiting block is respectively provided on the front side plate and the rear side plate, and the limiting block can be slidably inserted in the limiting groove.

[0013] Optionally, the side plate is provided with a folded edge portion, and the box cover is provided with a groove extending therethrough, and the folded edge portion can be slidably disposed in the groove along a penetration direction of the groove.

[0014] Optionally, an overcurrent bar and an insulating bracket are provided on the pole side of the single battery cell, a limiting hole is opened on the overcurrent bar, the insulating bracket is clamped between the single battery cell and the overcurrent bar, and a limiting column is provided on the insulating bracket, and the limiting column is inserted into the limiting hole.

[0015] Optionally, a positioning member is further included, wherein the positioning member is connected to the insulating bracket and is pressed and fitted on the top of the overflow bar.

[0016] Optionally, a plug-in assembly is installed on the side panel, and an external device is electrically connected to the single battery cell through the plug-in assembly. The plug-in assembly includes a male plug-in and a female plug-in. The male plug-in includes a plug, and the female plug-in has a slot. The plug is interference-inserted in the slot.

[0017] Optionally, a plurality of limiting convex bumps are circumferentially arranged on the plug, a plurality of guide grooves are circumferentially arranged on the side wall of the slot, the limiting convex bumps are arranged in one-to-one correspondence with the guide grooves, and the limiting convex bumps can be slidably arranged in the guide grooves.

[0018] Optionally, the end of the plug has a snap-in slot, and a bite column is protruding from the bottom of the slot. When the plug is located in the slot, the bite column is limitedly inserted in the snap-in slot.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model provides a battery box, which includes a plurality of panels, including a bottom plate, a box cover, and a plurality of side plates, wherein the bottom plate, the box cover, and the plurality of side plates are detachably connected and can be spliced ​​together to form an inner cavity, and the inner cavity can accommodate a plurality of stacked single cells. Since the bottom plate, the box cover, and the plurality of side plates are detachably connected, compared with an integrated molding method, the production of a customized mold can be omitted, and the plurality of panels can be stored and installed separately, and when one of the panels is damaged or has a problem, it can be allowed to be replaced or repaired separately, thereby reducing the mold opening cost of the battery box, reducing the occupied space and the overall scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a battery box provided by an embodiment of the utility model;

[0022] Figure 2 It is a partial structural exploded schematic diagram of a battery box provided in an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the battery box and the single battery cell after being assembled according to the embodiment of the utility model;

[0024] Figure 4 It is a partial structural schematic diagram of a battery box provided by an embodiment of the utility model;

[0025] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0026] Figure 6 It is a partial structural cross-sectional view of a battery box provided by an embodiment of the utility model;

[0027] Figure 7 It is a structural schematic diagram of the male plug-in provided in the embodiment of the utility model;

[0028] Figure 8 It is a schematic diagram of the structure of the female plug-in provided in the embodiment of the utility model;

[0029] Fig. 9 This is a schematic diagram of the structure of the battery box provided by the embodiment of the utility model with the box cover hidden;

[0030] Fig.10 yes Fig. 9 A partial enlarged view of point B in the middle.

[0031] In the figure:

[0032] 100, single cell;

[0033] 1. Plate; 101. Sliding block; 102. Sliding slot; 103. First clamping block; 1031. Clamping slot; 104. Second clamping block; 105. Limiting slot; 106. Limiting block; 107. Folding edge; 108. Groove; 11. Bottom plate; 12. Box cover; 13. Side plate; 131. Front side plate; 132. Rear side plate; 133. Left side plate; 134. Right side plate;

[0034] 2. Plug assembly; 21. male plug; 211. plug; 2111. limiting convex bump; 2112. snap-in groove; 22. female plug; 221. slot; 2211. guide groove; 2212. bite column;

[0035] 3. Current row; 31. Limit hole;

[0036] 4. Insulation bracket; 41. Hook;

[0037] 5. Positioning piece; 51. Clamping hole. DETAILED DESCRIPTION

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0041] Combine the following Figures 1 to 10 The technical solution provided by the utility model is introduced with reference to the specific embodiments. This embodiment provides a battery box capable of accommodating a plurality of single cells 100, so as to facilitate the handling, movement and use of the single cells 100. The battery box includes a plurality of panels 1, and the panels 1 include a bottom plate 11, a box cover 12 and a plurality of side panels 13, wherein the bottom plate 11, the box cover 12 and the plurality of side panels 13 are detachably connected and can be together surrounded to form an inner cavity for accommodating a plurality of single cells 100. By detachably connecting the bottom plate 11, the box cover 12 and the plurality of side panels 13, compared with the one-piece molding method, the production of customized molds can be omitted, and the plurality of panels can be stored and installed separately. When one of the panels 1 is damaged or has problems, it can also be allowed to be replaced or repaired separately, thereby reducing the mold opening cost of the battery box, reducing the occupied space and the overall scrap rate.

[0042] In this embodiment, a plurality of single battery cells 100 are stacked in a direction perpendicular to the main surface thereof, where the main surface is the side surface with a larger area on the single battery cell. One of the plates 1 arranged opposite to the main surface is fixedly arranged, and a sliding block 101 is arranged on the other plate 1 arranged opposite to the main surface. A sliding groove 102 is arranged on the other plate 1 (which may be a bottom plate 11, or a side plate 13 or a box cover 12) connected to the plate 1 provided with the sliding block 101. The sliding groove 102 extends in a direction perpendicular to the main surface, and the sliding block 101 can be slidably arranged in the sliding groove 102.

[0043] For example, reference Figure 3 As shown, in this embodiment, a plurality of single cells 100 are stacked along a first horizontal direction (eg Figure 3 In addition, along the horizontal first direction, at least one first side edge of the bottom plate 11 disposed opposite to each other is provided with a slide groove 102. Figure 2 As shown, the side plate 13 includes a front side plate 131, a rear side plate 132, a left side plate 133 and a right side plate 134, wherein the front side plate 131 and the rear side plate 132 are arranged along a horizontal second direction (such as Figure 2 The left side plate 133 and the right side plate 134 are relatively arranged along a first horizontal direction, and a sliding block 101 is arranged on the right side plate 134.

[0044] During operation, the bottom plate 11, the rear side plate 132 and the left side plate 133 are first fixedly connected, and then the single cells 100 are stacked in sequence with their main surfaces relative to the left side plate 133, and then the sliding block 101 on the right side plate 134 is inserted into the slide groove 102, and the right side plate 134 is pushed in a direction parallel to the stacking of the single cells 100 to apply a pre-tightening force to the multiple single cells 100, and finally the front side plate 131 and the box cover 12 are installed in sequence to complete the packaging and assembly of the multiple single cells 100. The above arrangement completes the packaging and fixing of the single cells 100 through multiple panels 1, omits the module-related parts such as the end plate, side plate 13 and strapping belt in the traditional battery pack, and directly goes from the single cell 100 to the PACK, thereby reducing the volume of the battery box and simplifying the grouping method. In addition, when the right side plate 134 is fixedly connected to other plates 1, it can squeeze multiple single cells 100 along the stacking direction of the single cells 100 to ensure that the two ends of the cell group formed by stacking multiple single cells 100 can fit tightly with the two ends of the battery box, thereby effectively suppressing the expansion force generated by the single cell 100 during the cycle process and ensuring the safety of the use of the single cell 100.

[0045] In this embodiment, Figure 2 As shown, a sliding block 101 is also provided on the left side plate 133, and along the horizontal first direction, two first side edges of the bottom plate 11 that are opposite to each other are provided with sliding grooves 102, so that the left side plate 133 and the right side plate 134 can be connected to the bottom plate 11 by sliding connection. Figure 2 As shown, two first clamping blocks 103 are respectively arranged on the left side plate 133 and the right side plate 134 along the first horizontal direction, and a clamping slot 1031 is opened on the first clamping block 103 along the second horizontal direction. In addition, two second clamping blocks 104 are respectively arranged on the front side plate 131 and the rear side plate 132 along the first horizontal direction, and the second clamping blocks 104 are slidably inserted in the clamping slot 1031, so that the plurality of side plates 13 are detachably connected.

[0046] Through the above arrangement, the operator can first move the left side plate 133 to insert the sliding block 101 on the left side plate 133 into the slide groove 102, and then insert the second clamping block 104 on the rear side plate 132 into the clamping groove 1031 to fix one end of the rear side plate 132 with the left side plate 133, thereby fixing the rear side plate 132, the left side plate 133 and the bottom plate 11 in a splicing manner. Afterwards, the sliding block 101 on the right side plate 134 is inserted into another slide groove 102, and the right side plate 134 is pushed to squeeze a plurality of single cells 100, and then the right side plate 134 is moved in a direction close to the rear side plate 132, so that the second clamping block 104 at the other end of the rear side plate 132 is inserted into the clamping groove 1031, thereby realizing the splicing connection of the rear side plate 132, the bottom plate 11 and the right side plate 134.

[0047] Furthermore, in the present embodiment, along the second horizontal direction, limiting grooves 105 are respectively provided on the two second side edges relatively arranged in relation to each other of the bottom plate 11, and a limiting block 106 is respectively provided on the front side plate 131 and the rear side plate 132, and the limiting block 106 can be slidably inserted into the limiting groove 105, so that when the front side plate 131 and the rear side plate 132 are connected with the left side plate 133 and the right side plate 134 through the second clamping block 104 and the clamping slot 1031, the limiting block 106 can be inserted into the limiting groove 105, so that the connection between the front side plate 131 and the rear side plate 132 and the bottom plate 11 is more stable and firm.

[0048] Optionally, in this embodiment, combined with Figure 4 , Figure 5 As shown, the upper edges of the left side plate 133 and the right side plate 134 are both provided with a folding portion 107, and a groove 108 is provided on the box cover 12 along the second horizontal direction. After the bottom plate 11, the left side plate 133, the right side plate 134 and the rear side plate 132 are fixedly connected, the grooves 108 on both sides of the box cover 12 are respectively aligned with a folding portion 107, and the folding portion 107 is inserted into the groove 108, and the box cover 12 is pushed to the top of the bottom plate 11 to complete the installation of the box cover 12. Through the above arrangement, the box cover 12 can be fixedly installed by the matching connection of the folding portion 107 and the groove 108, avoiding the movement of the box cover 12, thereby eliminating the need for fasteners for locking, and simplifying the operation steps. Finally, the two second card blocks 104 on the front side plate 131 are inserted into the remaining card slots 1031 to complete the packaging and installation of the entire battery box.

[0049] Optionally, in this embodiment, the battery box further includes a plug-in assembly 2, which includes a male plug-in assembly 21 and a female plug-in assembly 22, wherein the female plug-in assembly 22 is fixedly mounted on the front side plate 131, and the male plug-in assembly 21 is mounted on an external device, and the external device is electrically connected to the single battery cell 100 in the battery box through the plug-in connection between the male plug-in assembly 21 and the female plug-in assembly 22. Specifically, the male plug-in assembly 21 includes a plug 211, and the female plug-in assembly 22 has a slot 221, and the plug 211 is inserted into the slot 221 with interference fit. Through the above arrangement, it is possible to ensure that the connection between the external device and the battery box is tighter and the current capacity is guaranteed.

[0050] More specifically, combined with Figure 7 , Figure 8 As shown, three limiting convex bumps 2111 are arranged circumferentially on the plug 211, and three guide grooves 2211 are arranged circumferentially on the side wall of the slot 221. The limiting convex bumps 2111 are arranged one by one in the guide grooves 2211, and when the plug 211 is inserted into the slot 221, the limiting convex bumps 2111 can be slidably arranged in the guide grooves 2211, which can effectively increase the contact area between the male plug 21 and the female plug 22, increase the friction force, and thus effectively prevent the male plug 21 from loosening after insertion. This embodiment does not limit the number of limiting convex bumps 2111, as long as the plug 211 is inserted into the slot 221 smoothly and the stability of the plug 211 is good.

[0051] More specifically, in this embodiment, the end of the plug 211 also has a snap-fit ​​groove 2112, and the bottom of the slot 221 is protrudingly provided with a bite column 2212. After the plug 211 is inserted into the slot 221, the bite column 2212 can be limitedly inserted in the snap-fit ​​groove 2112, thereby further increasing the contact area between the plug 211 and the slot 221, thereby making the bite strength between the male plug 21 and the female plug 22 stronger.

[0052] Alternatively, if Fig. 9 As shown, after the single battery cell 100 is loaded into the inner cavity, it is necessary to electrically connect the multiple single battery cells 100 by using the overflow bar 3. In addition, the battery box also includes an insulating bracket 4 (such as a plastic bracket), and the insulating bracket 4 is clamped between the overflow bar 3 and the pole side of the single battery cell 100 to avoid short circuit problems. Before the single battery cell 100 and the overflow bar 3 are fixedly connected by BSB welding, the overflow bar 3 needs to be fixed to ensure the welding quality. In order to achieve the above purpose, in this embodiment, a limiting hole 31 is opened on the overflow bar 3, and a limiting column is set on the insulating bracket 4. After the overflow bar 3 is placed on the insulating bracket 4, the limiting column is inserted into the limiting hole 31 to limit the movement of the overflow bar 3 along the horizontal first direction and along the horizontal second direction, thereby ensuring the welding quality.

[0053] In order to limit the movement of the overflow bar 3 in the vertical direction and avoid the problem of poor electrical connection caused by a welding gap between the overflow bar 3 and the single battery cell 100, in this embodiment, a positioning piece 5 is also connected to the insulating bracket 4. The shape of the positioning piece 5 can be U-shaped or M-shaped, so that the middle part of the positioning piece 5 can be pressed on the top of the overflow bar 3, and the two ends of the positioning piece 5 can be connected to the insulating bracket 4 through a snap-on assembly. This not only ensures stable welding, but also realizes the recycling of the positioning piece 5, effectively saving production costs.

[0054] For example, refer to Fig.10 As shown, in this embodiment, a hook 41 is provided on the insulating bracket 4, and a clamping hole 51 is provided at the end of the positioning member 5. After the middle part of the positioning member 5 is pressed and fitted on the top of the overflow bar 3, the hook 41 can be engaged and connected to the clamping hole 51 to achieve the fixation of the positioning member 5 on the insulating bracket 4. After the overflow bar 3 is welded to the single battery cell 100, the operator can easily disengage the hook 41 from the clamping hole 51, thereby achieving the purpose of removing the positioning member 5 from the insulating bracket 4.

[0055] In the description of this specification, the description of reference terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery box, for accommodating a plurality of single cells (100), wherein the plurality of single cells (100) are stacked in a direction perpendicular to their main surfaces, characterized in that: The battery box comprises a plurality of panels (1), wherein the panels (1) comprise a bottom plate (11), a box cover (12) and a plurality of side plates (13), wherein the bottom plate (11), the box cover (12) and the plurality of side plates (13) are detachably connected and can be together surrounded to form an inner cavity, wherein the inner cavity is used to accommodate a plurality of the single cells (100), wherein one of the panels (1) arranged opposite to the main surface is fixedly arranged, and another of the panels (1) arranged opposite to the main surface is fixedly arranged. A sliding block (101) is provided on the plate member (1), and a sliding groove (102) is provided on the other plate member (1) connected to the plate member (1) provided with the sliding block (101), wherein the sliding groove (102) extends in a direction perpendicular to the main surface, and the sliding block (101) can be slidably arranged in the sliding groove (102), so that the plate member (1) provided with the sliding block (101) can apply a pre-tightening force to the plurality of single cells (100).

2. The battery box according to claim 1, characterized in that: The single cells (100) are stacked along a first horizontal direction, and along the first horizontal direction, at least one first side edge of the bottom plate (11) arranged opposite to each other is provided with the slide groove (102), and the side plate (13) arranged opposite to the slide groove (102) is provided with the slide block (101).

3. The battery box according to claim 2, characterized in that: Along the first horizontal direction, two first side edges of the bottom plate (11) that are arranged opposite to each other are both provided with the sliding groove (102); The side plate (13) comprises a front side plate (131), a rear side plate (132), a left side plate (133) and a right side plate (134); the left side plate (133) and the right side plate (134) are arranged opposite to each other along the horizontal first direction; the left side plate (133) and the right side plate (134) are both provided with the sliding blocks (101); the sliding blocks (101) are arranged in a one-to-one correspondence in the sliding grooves (102); and two first clamping blocks (103) are respectively arranged on the left side plate (133) and the right side plate (134) along the horizontal second direction; a clamping groove (1031) is opened on the first clamping block (103) along the horizontal second direction; and the horizontal second direction is perpendicular to the horizontal first direction; Two second clamping blocks (104) are respectively arranged on the front side plate (131) and the rear side plate (132) along the horizontal first direction, and the second clamping blocks (104) can be slidably inserted into the clamping slots (1031) to achieve detachable connection between the plurality of side plates (13).

4. The battery box according to claim 3, characterized in that: Along the second horizontal direction, two second side edges (112) of the bottom plate (11) that are arranged opposite to each other are respectively provided with limiting grooves (105), and a limiting block (106) is respectively provided on the front side plate (131) and the rear side plate (132), and the limiting block (106) can be slidably inserted in the limiting groove (105).

5. The battery box according to claim 1, characterized in that: The side plate (13) is provided with a folded edge portion (107), and the box cover (12) is provided with a groove (108) extending therethrough. The folded edge portion (107) can be slidably arranged in the groove (108) along the penetrating direction of the groove (108).

6. The battery box according to any one of claims 1 to 5, characterized in that: An overcurrent bar (3) and an insulating support (4) are provided on the pole side of the single battery cell (100); a limiting hole (31) is provided on the overcurrent bar (3); the insulating support (4) is clamped between the single battery cell (100) and the overcurrent bar (3); and a limiting column is provided on the insulating support (4); the limiting column is inserted into the limiting hole (31).

7. The battery box according to claim 6, characterized in that: It also comprises a positioning member (5), wherein the positioning member (5) is connected to the insulating support (4) and is pressed and fitted on the top of the overflow bar (3).

8. The battery box according to any one of claims 1 to 5, characterized in that: The side plate (13) is provided with a plug assembly (2), and an external device is electrically connected to the single battery cell (100) via the plug assembly (2); the plug assembly (2) comprises a male plug assembly (21) and a female plug assembly (22); the male plug assembly (21) comprises a plug (211), and the female plug assembly (22) has a slot (221); the plug (211) is interference-inserted into the slot (221).

9. The battery box according to claim 8, characterized in that: The plug (211) is provided with a plurality of limiting convex bumps (2111) along the circumference, and the side wall of the slot (221) is provided with a plurality of guide grooves (2211) along the circumference. The limiting convex bumps (2111) are provided in a one-to-one correspondence with the guide grooves (2211), and the limiting convex bumps (2111) can be slidably provided in the guide grooves (2211).

10. The battery box according to claim 8, characterized in that: The end of the plug (211) is provided with a snap-fitting groove (2112), and the bottom of the slot (221) is provided with a snap-fitting column (2212). When the plug (211) is located in the slot (221), the snap-fitting column (2212) is inserted into the snap-fitting groove (2112) in a limited position.

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