Clamping structure for connecting end plate and side plate and enclosure frame

Abstract

The utility model discloses a clamping structure for connecting an end plate and a side plate and an enclosure frame. The clamping structure for connecting the end plate and the side plate comprises an inner concave part and an inner convex part, wherein the inner concave part is arranged on the outer surface of the end plate and corresponds to the position of the side plate, and the inner convex part is arranged on the side plate and is used for extending into the inner concave part; the inner concave part is provided with a limiting part used for limiting the inner convex part to be separated from the thickness direction of the end plate, and an elastic abutting part used for abutting the inner convex part into the limiting part in the width direction of the end plate is further arranged in the inner concave part. The clamping structure for connecting the end plate and the side plate and the enclosure frame can prevent the side plate and the end plate from directly falling off after cracking at the welding position.

Description

Technical Field

[0001] The utility model relates to the technical field of enclosures, in particular to an end plate and an enclosure for a battery module. Background Art

[0002] With the development of new energy technologies, the management of power and energy storage batteries has become increasingly important. Power and energy storage batteries include a plurality of battery modules electrically connected together, and each battery module includes a plurality of single cells and an enclosure for fixing the plurality of single cells. The enclosure includes an end plate and side plates, and the end plate and the side plates are fixedly installed by welding. In some cases, the single cells themselves will expand, thereby applying an expansion force to the end plate and the side plates, which causes the end plate and the side plates to be easily deformed and displaced, and further causes the side plates to separate from the end plate at the welding joint. After separation, the expansion of the battery cells is out of control, and the battery cells are prone to rupture over a long time, posing a safety hazard. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a clamping structure for connecting an end plate and a side plate and an enclosure that prevent the connection between the end plate and the side plate from falling off.

[0004] To solve the above problems, the utility model provides an end plate and an enclosure, which include a concave portion provided on the outer surface of the end plate corresponding to the position of the side plate, and a convex portion provided on the side plate and used for extending into the concave portion; the concave portion has a limiting portion for restricting the convex portion from detaching from the end plate in the thickness direction of the end plate, and an elastic abutting portion for abutting the convex portion in the width direction of the end plate within the limiting portion is further provided in the concave portion.

[0005] Further, the outer surface of the end plate is an outer surface provided along the thickness direction of the end plate and away from the inner cavity of the enclosure, and concave portions are provided on both sides in the width direction of the outer surface of the end plate for respectively limiting adjacent side plates. The concave portions are recessed from the outer surface towards the inner cavity of the enclosure; the side plate includes a side plate body and a limiting plate bent from one end of the side plate body along the width direction of the enclosure. The convex portion is provided on the inner surface of the limiting plate, and the convex portion and the concave portion are correspondingly arranged.

[0006] Further, the concave portion includes a positioning groove recessed from the outside to the inside. The positioning groove includes a narrow groove and a wide groove distributed from the outside to the inside along the thickness direction of the end plate. The wide groove extends towards the center of the end plate in the width direction of the end plate and is wider than the narrow groove. A stepped limiting portion is formed between the side wall near the center of the wide groove and the side wall on the same side of the narrow groove.

[0007] The inner convex part includes a positioning strip extending into the wide groove and the narrow groove, and an anti - detachment protrusion is arranged on the positioning strip corresponding to the stepped limiting part, and the anti - detachment protrusion is hooked at the limiting part;

[0008] The elastic abutting part abuts between the positioning strip and the other side wall of the positioning groove to prevent the anti - detachment protrusion from detaching from the limiting part in the width direction of the end plate.

[0009] Furthermore, the inner concave part further includes a positioning hole arranged side by side with the positioning groove along the width direction of the end plate, and the positioning hole is arranged on the side of the positioning groove far from the center of the end plate; the positioning hole is recessed inward from the outer surface of the end plate;

[0010] The inner convex part further includes a positioning post arranged on the side plate corresponding to the position of the positioning hole. There is an accommodation space between the positioning hole and the positioning groove for accommodating the elastic abutting part; the elastic abutting part is arranged in the accommodation space and abuts between the positioning post and the positioning strip.

[0011] Furthermore, the inner end of the positioning hole is close to the side of the positioning groove and communicates with the accommodation space, the outer end of the positioning hole is close to the side of the positioning groove and is arranged at an interval from the positioning groove, and the inner end of the positioning groove is close to the side of the accommodation space and communicates with the accommodation space.

[0012] Furthermore, the accommodation space penetrates through one end of the end plate in the height direction of the end plate to form an installation opening, and the elastic abutting part is loaded into the accommodation space from the installation opening.

[0013] Furthermore, the elastic abutting part has a back arranged in the accommodation space, a first elastic abutting arm and a second elastic abutting arm connected to the back. The first elastic abutting arm abuts on the positioning post, and the second elastic abutting arm abuts on the positioning strip; the back, the first elastic abutting arm and the second elastic abutting arm enclose a cavity, the cavity penetrates the elastic abutting part in the height direction, and an opening is formed between the ends of the first elastic abutting arm and the second elastic abutting arm far from the back, and the cavity communicates with the outside of the elastic abutting part through the opening.

[0014] Furthermore, a first limiting piece for limiting the contraction stroke of the second elastic abutting arm is arranged on the inner cavity wall of the elastic abutting part; a second limiting piece is arranged on the side of the first elastic abutting arm close to the positioning post, and a limiting socket for limiting and cooperating with the second limiting piece is arranged on the positioning post.

[0015] To solve the above problems, the present utility model further provides a surrounding frame, which is formed by enclosing end plates and side plates, and adjacent end plates and side plates are clamped through the clamping structure described in any one of the above.

[0016] Furthermore, the outer surface of the end plate has a welding area, the outer end of the inner concave portion is located in the welding area, the welding area is a vertical plane, the side plate has a vertical plane corresponding to the welding area, and the side plate is welded to the welding area.

[0017] In the present utility model, the clamping structure for connecting the end plate and the side plate and the surrounding frame use the elastic support member to abut the inner convex portion in the inner concave portion, restricting the inner convex portion from falling off from the width of the end plate in the inner concave portion. At the same time, the limiting portion restricts the inner convex portion from falling off from the thickness direction of the end plate in the inner concave portion, which can effectively prevent the end plate and the side plate from directly falling off even if the welding between the end plate and the side plate comes off. The double guarantee improves the stability of the connection between the side plate and the baffle, and improves the safety of the battery module. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a preferred embodiment of the surrounding frame for the battery module of the present utility model.

[0019] Figure 2 is a partial cross-sectional view of the surrounding frame for the battery module of the present utility model.

[0020] Figure 3 is Figure 2 a partial enlarged view of A in

[0021] Figure 4 is a schematic structural diagram of the positioning post and the positioning strip.

[0022] Figure 5 is Figure 4 a partial enlarged view of B in

[0023] Figure 6 is a top view of the end plate.

[0024] Figure 7 is a cross-sectional view of the end plate.

[0025] Figure 8 is a schematic structural diagram of the elastic abutting portion.

[0026] The meanings of the reference numerals in the drawings are as follows:

[0027] End plate 1, positioning groove 111, narrow groove 1111, wide groove 1112, positioning hole 112, accommodation space 113, limiting part 114, limiting projection part 115, weight reduction hole 12, lifting hole 13, outer surface 101, welding area 1011, side plate 2, side plate body 21, limiting plate 22, inner convex part 23, positioning strip 231, anti - detachment projection 232, positioning column 233, limiting socket 2331, positioning strip 22, anti - detachment projection 232, elastic abutting part 3, inner cavity 30, back 31, first elastic abutting arm 32, second elastic abutting arm 33, first limiting piece 34, second limiting piece 35. Detailed implementation mode

[0028] The present utility model will be further described below with reference to the accompanying drawings.

[0029] As Figures 1 to 3 shown, the preferred implementation mode of the present utility model for the enclosure of the battery module includes an end plate 1 and a side plate 2. There are two end plates 1 and two side plates 2. The two end plates 1 are oppositely arranged, and both ends of each side plate 2 are clamped on the end plate, and at the same time, the side plate 2 is welded to the end plate 1, so that the end plate 1 and the side plate 2 enclose to form an enclosure A. An elastic abutting part 3 is arranged inside the end plate 1, and the elastic abutting part 3 abuts against the side plate 2, which can prevent the end plate 1 and the side plate 2 from still remaining in a connected state when the welding between the end plate 1 and the side plate 2 falls off, that is, the stability of the connection between the side plate 2 and the end plate 1 is improved.

[0030] As Figure 4 and Figure 5 shown, the side plate 2 includes a side plate body 21 and two limiting plates 22. Each limiting plate 22 is bent from one end of the side plate body 21 along the width direction of the enclosure A, that is, both ends of the side plate body 21 are bent to form two limiting plates 22. The inner surface of the limiting plate 22 is attached to the end plate 1, and the inner surface of the limiting plate 22 is a plane, that is, the surface where the limiting plate 22 is attached to the end plate 1 is a plane, which is convenient for the side plate 2 and the end plate 1 to be more closely attached during welding. The side plate 2 is also provided with an inner convex part 23, the inner convex part 23 is inserted into the end plate 1, and the inner convex part 23 abuts against the elastic abutting part 3 arranged inside the end plate 1, and the abutting part 3 abuts against the inner convex part 23 in the width direction of the end plate 1. Before the side plate 2 and the end plate 1 are welded, the side plate 2 can be installed on the end plate 1 without falling off, which is convenient for the relative position of the side plate 2 and the end plate 1 to be more stable during welding; at the same time, it can also prevent the side plate 2 and the end plate 1 from falling off after the separation at the welding joint of the side plate 2 and the end plate 1, providing double protection for the stability of the enclosure.

[0031] The inner convex part 23 includes a positioning strip 231, an anti - detachment protrusion 232 and a positioning post 233. The positioning strip 231 extends into the end plate 1. The anti - detachment protrusion 232 is provided on the positioning strip 231, and the positioning post 233 is provided on the side plate body 21. The anti - detachment protrusion 232 is located at the end of the positioning strip 231 and on the side close to the center of the end plate 1. The anti - detachment protrusion 232 cooperates with the end plate 1 and is used to prevent the positioning strip 231 from detaching from the end plate 1 in the thickness direction. The anti - detachment protrusion 232 is provided with a guiding arc surface, which bends from the center of the end plate 1 towards the side plate 2. Thus, when installing, it is convenient to squeeze the positioning strip 231, which can guide the positioning strip 231 to bend and deform towards the direction of the positioning post 233, facilitating the anti - detachment protrusion 232 to be stuck into the end plate 1. After being stuck into the end plate 1, the positioning strip 23 can reset. The reset positioning strip 231 drives the anti - detachment protrusion 232 to reset, so that the anti - detachment protrusion 232 abuts against the end plate 1, preventing the positioning strip 231 from detaching from the end plate 1 in the thickness direction, that is, restricting the side plate 2 from detaching from the end plate 1 in the thickness direction. There are three positioning posts 233, and the three positioning posts 233 are evenly distributed on the side plate 2 along the height direction of the end plate 1. A limiting socket 2331 is provided on the positioning post 233, and the limiting socket 2331 is arranged along the width direction of the end plate 1. The limiting socket 2331 is used to cooperate with the elastic abutting part 3 to prevent the positioning post 233 from detaching from the end plate 1 in the thickness direction.

[0032] Combined Figure 6 and Figure 7 with reference, an inner concave part 11 is provided on the outer surface 101 of the end plate 1, and the position of the inner concave part 11 corresponds to the position where the inner convex part 23 of the side plate 2 is located. There are two inner concave parts 11, and the two inner concave parts 11 are located on both sides of the outer surface 101 of the end plate 1 in the width direction. The inner concave part 11 is recessed from the outer surface 101 towards the inner cavity of the surrounding frame; the two inner concave parts 11 are respectively used to limit the corresponding side plate 2. Specifically, the inner concave part 11 is used to limit the inner convex part 23. A welding area 1011 is provided on the outer surface 101 of the end plate 1. There are two welding areas 1011, and the two welding areas 1011 are arranged opposite to each other along the width direction of the end plate 1. The welding areas 1011 are both flat surfaces, and the limiting plate 22 of the side plate 2 is welded to the welding area 1011. In this way, the limiting plate 22 can fit well on the welding area 1011, and the welding quality is better. In this embodiment, the outer surface 101 of the end plate 1 refers to the outer surface along the thickness direction of the end plate 1 and away from the inner cavity of the surrounding frame A.

[0033] The inner concave part 11 has a limiting part 114, and the limiting part 114 is used to limit the inner convex part 23 to prevent the inner convex part 23 from detaching from the end plate 1 in the thickness direction, that is, to prevent the anti - detachment protrusion 232 from detaching from the end plate 1 in the thickness direction.

[0034] The concave portion 11 includes a positioning groove 111, a positioning hole 112 and an accommodation space. The positioning groove 111 is recessed on the outer surface 101 of the end plate 1 from the outside of the surrounding frame A towards the inside of the surrounding frame A. The positioning hole 112 is arranged side by side with the positioning groove 111 along the width direction of the end plate 1. The accommodation space 113 is located between the positioning groove 111 and the positioning hole 112, and the accommodation space 113 is communicated with both the positioning groove 111 and the positioning hole 112 at the same time. The positioning groove 111 is located in the welding area 1011. The positioning groove 112 is used to define the positioning strip 231 of the inner convex portion 23 to prevent the inner positioning strip 231 from falling off from the end plate 1 in the thickness direction in the positioning groove 112. The positioning groove 111 includes a narrow groove 1111 and a wide groove 1112 that are distributed from the outside to the inside along the thickness direction of the end plate 1. The wide groove 1112 extends towards the center of the end plate 1 along the width direction of the end plate 1 to form the narrow groove 1111, so that the positioning groove 111 is L-shaped. The limiting portion 113 is located between the side wall of the wide groove 1112 close to the center of the end plate 1 and the same side wall of the narrow groove 1111, and the limiting portion 113 is stepped. When the inner convex portion 23 is inserted into the positioning groove 111, the positioning strip 231 is located in the wide groove 1112, and the anti-detachment protrusion 232 is located in the narrow groove 1111. In this way, if the positioning strip 231 needs to be detached from the positioning groove 112, it needs to move in the direction away from the center of the end plate 1 first to achieve this. Generally speaking, the force when the side plate 2 is detached from the end plate 1 always remains from the inside of the surrounding frame A to the outside, so it can be ensured that the side plate 2 will not be easily detached from the end plate 1. Generally speaking, the width of the wide groove 1112 is greater than the sum of the widths of the positioning strip 231 and the positioning post 233, so that the positioning post 233 and the anti-detachment protrusion 232 can be inserted into the positioning groove 111. The positioning hole 112 is arranged on the side of the positioning groove 111 away from the center of the end plate 1; the positioning hole 112 is recessed from the outer surface 101 of the end plate 1 towards the inside of the surrounding frame A. The positioning post 233 is inserted into the positioning hole 112, and the positioning hole 112 is used to define the positioning post 233 to quickly position the position of the side plate 2. The elastic abutting portion 3 is inserted into the accommodation space 113. The accommodation space 113 penetrates one end of the end plate 1 along the height direction of the end plate 1 to form an installation opening, that is, the accommodation space 113 extends downward from the top surface of the end plate 1, and the opening on the top surface of the end plate 1 is the installation opening. The elastic abutting portion 3 is loaded into the accommodation space 113 from the installation opening. The inner end of the positioning hole 112 close to one side of the positioning groove 111 is communicated with the accommodation space 113, and the outer end of the positioning hole 112 close to one side of the positioning groove 111 is spaced from the positioning groove 111. The inner end of the positioning groove 111 close to the accommodation space 113 is communicated with the accommodation space 113, so as to ensure that the elastic abutting portion 3 can abut against both the positioning strip 231 and the positioning post 233 at the same time.The elastic abutting portion 3 can simultaneously provide an opposite force to the positioning strip 231 and the positioning post 233, ensuring that the positioning strip 231 and the positioning post 233 are not easily detached from the end plate 1. That is, without a large lateral force squeezing towards the middle of the positioning strip 231 and the positioning post 233 simultaneously, the positioning strip 231 and the positioning post 233 cannot be detached from the end plate 1. Only by removing the elastic abutting portion 3 can the positioning strip 231 and the positioning post 233 be taken out. The bottom of the accommodation space 113 is lower than the bottom of the positioning groove 111, so as to ensure that when the elastic abutting portion 3 is inserted, the elastic abutting portion 3 will not be inserted into the positioning groove 111.

[0035] The end plate 1 is provided with weight-reducing holes 114, and the weight-reducing holes 114 penetrate the end plate 1 in the height direction. The weight-reducing holes 114 are used to reduce the weight of the end plate 1. The number of the weight-reducing holes 114 is multiple and arranged in parallel, so as to reduce the weight of the end plate 1 as much as possible while ensuring that the strength of the end plate 1 will not be weakened. The shape of the weight-reducing holes 114 is set according to the strength at this position, and it can be rectangular, triangular or other shapes. The outer surface 101 is provided with limiting convex portions 115 for limiting the side plate 2. The limiting convex portions 115 are arranged one above the other to form a group, and a group of limiting convex portions 115 are provided on both sides of the end plate 1 in the width direction. The two limiting convex portions 115, one above the other, limit the top and bottom of the side plate 2 to prevent the side plate 2 from moving in the height direction. The end plate 1 is provided with a lifting hole 116 arranged along the thickness direction on the outer surface 101, which is convenient for a lifting device to extend into the lifting hole 116 to lift the entire battery module, and can also be used as a positioning hole 112 for the end plate 1 when assembling the surrounding frame.

[0036] As Figure 8 shown, the elastic abutting portion 3 can contract in the width direction of the end plate 1. In this way, the elastic abutting portion 3 can contract during installation, which is convenient for inserting the elastic abutting portion 3 into the accommodation space 113. After installation, the elastic abutting portion 3 can also provide an opposite thrust to the positioning strip 231 and the positioning post 233 of the side plate 2, ensuring that the positioning strip 231 and the positioning post 233 cannot easily move in the width direction of the end plate 1. The width of the elastic abutting portion 3 after contraction is greater than the width difference between the positioning strip 231 and the wide groove 1112, so as to ensure that even if there is a lateral force squeezing the elastic abutting portion 3, after the elastic abutting portion 3 contracts, the anti-detachment protrusion 232 cannot be detached from the narrow groove 1111.

[0037] The elastic abutting portion 3 has a back 31, a first elastic abutting arm 32 and a second elastic abutting arm 33. The first elastic abutting arm 32 and the second elastic abutting arm 33 are both connected to the back 31. Generally speaking, the first elastic abutting arm 32 and the second elastic abutting arm 33 are mirror-symmetrical with the back 31 as the center, that is, the first elastic abutting arm 32 and the second elastic abutting arm 33 have the same structural style. The first elastic abutting arm 32 and the second elastic abutting arm 33 can both be deformed under the action of external force and can be reset after the external force disappears, so that the elastic abutting portion 3 has a contraction function. The first elastic abutting arm 32 and the second elastic abutting arm 33 are divided into two sides located at the back 31. The first elastic abutting arm 32 is used to elastically abut against the positioning column 233, and the second elastic abutting arm 33 is used to elastically abut against the positioning strip 231. The back 31 abuts against the inner surface of the accommodating space 113 close to the outer surface of the end plate 1. Specifically, the back 31, the first elastic abutment arm 32 and the second elastic abutment arm 33 enclose an inner cavity, the inner cavity 30 penetrates the elastic abutment portion 3 from the height direction, an opening is formed between the ends of the first elastic abutment arm 32 and the second elastic abutment arm 33 away from the back 31, and the inner cavity 30 is connected to the outside of the elastic abutment portion 3 through the opening. In this way, the first elastic abutment arm 32 and the second elastic abutment arm 33 can be squeezed and deformed toward the center of the elastic abutment portion 3, so that the elastic abutment portion 3 can be contracted in the width direction of the end plate 1. The first elastic abutment arm 32, the second elastic abutment arm 33 and the back 31 are of the same height, and the first elastic abutment arm 32, the second elastic abutment arm 33 and the back 31 are all arc-shaped, so that the entire elastic abutment portion 3 is an arc tube with an opening, that is, C-shaped, so that the elastic abutment portion 3 can be made in one piece, reducing the assembly steps. In another embodiment, the first elastic abutting arm 32, the second elastic abutting arm 33 and the back 31 are all straight lines, so that the cross section of the elastic abutting portion 3 is U-shaped; the first elastic abutting arm 32 and the second elastic abutting arm 33 can also be set as a multi-segment type, so that the cross section of the elastic abutting portion 3 is an unclosed polygon. The inner cavity wall of the elastic abutting portion 3 is provided with a first limiting piece 34, and the first limiting piece 34 is used to limit the contraction stroke of the second elastic abutting arm 33; the first limiting piece 34 is arranged along the width of the end plate 1 to limit the contraction stroke of the elastic abutting portion 3, effectively avoiding excessive contraction of the elastic abutting portion 3, and thereby ensuring that the inner convex portion 23 cannot be detached from the positioning groove 111. A second limiting plate 35 is provided on the first elastic supporting arm 32. The second limiting plate 35 is close to one side of the positioning column 233. The second limiting plate 35 cooperates with the limiting socket 2331 on the positioning column 233 to limit the positioning column 233 and prevent the positioning column 233 from detaching from the thickness direction of the end plate 1.

[0038] When assembling the surrounding frame, first, the positioning strips 231 on the limiting plates 22 at both ends of the side plate 2 are snapped into the positioning grooves 111 of the end plate 1, and at the same time, the positioning posts 233 are inserted into the positioning holes 112. Since the anti - detachment protrusions 232 on the positioning strips 231 have guiding arc surfaces, when the positioning strips 231 are inserted into the positioning grooves 111, the positioning strips 231 will be squeezed and bent, so that the positioning strips 231 and the anti - detachment protrusions 232 are snapped into the positioning grooves 111, and at the same time, the anti - detachment protrusions 232 are abutted against the positioning grooves 111. Then, the elastic abutting part 3 is contracted and inserted into the accommodation space 113, and finally, the end plate 1 and the side plate 2 are welded at the welding area 1011. During welding, since the side plate 2 and the end plate 1 are initially fixed, it can ensure that the end plate 1 and the side plate 2 do not move during the welding process, improving the welding quality. During use, if the welding position between the end plate 1 and the side plate 2 comes off, the side plate 2 can still be stuck on the end plate 1 relying on the restriction of the elastic abutting part 3 in the accommodation space 113 and the restriction of the anti - detachment protrusions 232, and will not fall off directly, avoiding potential safety hazards caused by the detachment of the side plate 2 and the end plate 1.

[0039] The above is only the implementation mode of the present invention, and does not limit the patent scope of the present invention accordingly. Any equivalent structure made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is similarly within the patent protection scope of the present invention.

Claims

1. A clamping structure for connecting an end plate and a side plate, characterized in that: It includes an inner recessed portion arranged on the outer surface of the end plate at a position corresponding to the position of the side plate, and an inner protruding portion arranged on the side plate and used to extend into the inner recessed portion; the inner recessed portion has a limiting portion for limiting the inner protruding portion from detaching from the thickness direction of the end plate, and the inner recessed portion is also provided with an elastic supporting portion for supporting the inner protruding portion within the limiting portion in the width direction of the end plate.

2. The clamping structure for connecting the end plate and the side plate according to claim 1, characterized in that: The end plate and the side plate are combined to form a frame, the outer surface of the end plate is arranged along the thickness direction of the end plate and away from the outer surface of the inner cavity of the frame, the outer surface of the end plate is provided with inner recesses on both sides in the width direction for respectively limiting adjacent two side plates, and the inner recesses are recessed from the outer surface toward the inner cavity of the frame; the side plate includes a side plate body and a limiting plate bent from one end of the side plate body along the width direction of the frame, the inner convex portion is arranged on the inner surface of the limiting plate, and the inner convex portion is arranged corresponding to the inner recess.

3. The clamping structure for connecting the end plate and the side plate according to claim 1, characterized in that: The inner concave portion includes a positioning groove formed by being recessed from the outside to the inside, and the positioning groove includes a narrow groove and a wide groove distributed from the outside to the inside along the thickness direction of the end plate, and the wide groove extends toward the center of the end plate along the width direction of the end plate to be wider than the narrow groove, and a stepped limiting portion is formed between a side wall of the wide groove close to the center and a side wall on the same side of the narrow groove; The inner convex part includes a positioning strip extending into the wide groove and the narrow groove, and an anti-slip protrusion is arranged on the positioning strip corresponding to the stepped limiting part, and the anti-slip protrusion is hooked at the limiting part; The elastic abutting portion abuts between the positioning strip and the other side wall of the positioning groove to prevent the anti-slip protrusion from being separated from the limiting portion in the width direction of the end plate.

4. The clamping structure for connecting the end plate and the side plate according to claim 3, characterized in that: The inner recess further comprises a positioning hole arranged side by side with the positioning groove along the width direction of the end plate, the positioning hole being arranged on a side of the positioning groove away from the center of the end plate; the positioning hole is recessed inward from the outer surface of the end plate; The inner protrusion also includes a positioning column arranged on the side plate corresponding to the position of the positioning hole, and a receiving space for accommodating the elastic supporting portion is provided between the positioning hole and the positioning groove; the elastic supporting portion is arranged in the receiving space and is supported between the positioning column and the positioning strip.

5. The clamping structure for connecting the end plate and the side plate according to claim 4, characterized in that: The inner end of the positioning hole is close to one side of the positioning groove and communicates with the accommodating space, the outer end of the positioning hole is close to one side of the positioning groove and is spaced apart from the positioning groove, and the inner end of the positioning groove is close to one side of the accommodating space and communicates with the accommodating space.

6. The clamping structure for connecting the end plate and the side plate according to claim 5, characterized in that: The accommodating space passes through one end of the end plate along the height direction of the end plate to form an installation opening, and the elastic supporting portion is installed into the accommodating space from the installation opening.

7. The clamping structure for connecting the end plate and the side plate according to claim 5, characterized in that: The elastic supporting portion comprises a back portion arranged in the accommodating space, a first elastic supporting arm and a second elastic supporting arm connected to the back portion, the first elastic supporting arm supporting the positioning column, and the second elastic supporting arm supporting the positioning strip; the back portion, the first elastic supporting arm and the second elastic supporting arm together form an inner cavity, the inner cavity penetrates the elastic supporting portion from the height direction, an opening is formed between the ends of the first elastic supporting arm and the second elastic supporting arm away from the back portion, and the inner cavity is connected to the outside of the elastic supporting portion through the opening.

8. The clamping structure for connecting the end plate and the side plate according to claim 7, characterized in that: The inner cavity wall of the elastic supporting part is provided with a first limiting piece that limits the contraction stroke of the second elastic supporting arm; a second limiting piece is provided on the side of the first elastic supporting arm close to the positioning column, and the positioning column is provided with a limiting socket that cooperates with the second limiting piece.

9. A frame, formed by enclosing end panels and side panels, characterized in that: The adjacent end plates and side plates are clamped together by the clamping structure according to any one of claims 1 to 8.

10. The frame according to claim 9, characterized in that: The outer surface of the end plate has a welding area, the outer end of the inner recess is located in the welding area, the welding area is a vertical plane, the side plate has a vertical plane corresponding to the welding area, and the side plate is welded to the welding area.

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