WO2022083534A1

WO2022083534A1 - Box reinforcing edge beam structure having buffer, and battery box thereof

Info

Publication number: WO2022083534A1
Application number: PCT/CN2021/124355
Authority: WO
Inventors: 邓江南; 杜俊丰; 刘晨南; 尹振华
Original assignee: 江苏正力新能电池技术有限公司
Priority date: 2020-10-22
Filing date: 2021-10-18
Publication date: 2022-04-28
Also published as: CN112234291A; CN112234291B

Abstract

Provided are a box reinforcing edge beam structure having a buffer, and a battery box thereof. The box body of the battery box is enclosed by four L-shaped wall elements. Each L-shaped wall structure comprises a horizontal side plate and a vertical wall plate. The vertical wall plates constitute a box wall. The inner sides of the front end and the rear end of the box body are provided with a box reinforcing edge beam structure having a buffer. The present reinforcing edge beam structure comprises side cross beams arranged on the horizontal side plates in the box body and elastic edge beams pressed between the side cross beams and the box wall by means of the side cross beams. The side cross beams are provided with kidney-shaped holes, and are connected to the horizontal side plates by means of bolts arranged inside the kidney-shaped holes. The kidney-shaped holes allow the side cross beams to move toward the box wall under external force, and to be supported by elastic deformation of the elastic edge beams. In the present battery box, the box reinforcing edge beam structure having a buffer and the cooperation of L-shaped wall elements and inclined end surface connections between the L-shaped wall elements are used to significantly the impact force transmitted to the battery in the battery box when the battery box is impacted, thereby protecting the battery.

Description

A box-reinforced side beam structure with buffer and its battery box

This application claims the priority of the Chinese patent application filed with the China Patent Office on October 22, 2020, the application number is 202011141059.4, and the invention name is "A box-reinforced side beam structure with buffer and its battery box". The entire contents of this application are incorporated by reference.

technical field

The present application relates to the technical field of battery packaging for battery packs, and in particular, to a box-reinforced side beam structure with buffers and a battery box thereof.

Background technique

In the battery pack assembly technology of electric vehicles, the physical strength and impact resistance of the battery pack are used. The physical strength and impact resistance of the battery pack are provided by the battery case that houses the battery. Therefore, the physical strength and impact resistance of the battery box are very important. In the power battery box in the prior art, in order to strengthen the physical strength and impact resistance strength of the battery box, a reinforcing beam structure is usually designed. However, in the prior art, the reinforcing beam structures in the battery box are all fixed connections, and there are no shock-relieving components. When the car is hit, the impact force generated by the impact is transmitted to the battery through the reinforcing beam as usual, causing the battery to burst and cause a short circuit of the battery, or even Cause the battery to catch fire and explode.

SUMMARY OF THE INVENTION

The problem to be solved by the present invention is that the impact resistance strength of the power battery box is insufficient.

For solving the above problems, the scheme adopted in the present invention is as follows:

A box reinforced side beam structure with buffering according to the present invention includes a side beam arranged on the inner edge of the box and an elastic side beam that is withheld between the side beam and the box wall by the side beam; the The side beams are provided with waist-shaped holes, and are connected to the bottom of the box through bolts arranged in the waist-shaped holes, and are parallel to the box wall; the waist-shaped holes are perpendicular to the box wall in the length direction, so that the side beams are Under the action of external force, the side beam can be displaced toward the box wall; when the side beam is displaced toward the box wall, the side beam is supported by the elastic deformation of the elastic side beam.

Further, according to the box-reinforced side beam structure with buffering of the present invention, the side beam is provided with a withholding slope for withholding the elastic side beam; the elastic side beam is formed by bending a plate body, and is provided with The oblique bending plate is matched with the withholding inclined surface; the withholding inclined surface is closely attached to the oblique bending plate and is withheld on the oblique bending plate.

Further, according to the box-reinforced side beam structure with buffering of the present invention, the side beam includes a top surface, a bottom surface, a first vertical surface, a crimping inclined surface and a second vertical surface; the first vertical surface is vertical and connects the sides The top surface of the beam, the second vertical surface is vertical and connected to the bottom surface; the first vertical surface and the second vertical surface are connected by a crimping inclined surface; the crimping inclined surface makes the top surface of the side beam wider than the bottom surface; the elastic edge The beam includes a first bending plate, a second bending plate, a third bending plate, an oblique bending plate, a fifth bending plate and a sixth bending plate formed by bending the plate body in sequence; wherein , the first bending plate is vertical and close to the connecting end wall plate; the third bending plate is vertical and opposite to the first vertical surface of the side beam, and the fifth bending plate is vertical and is opposite to the first vertical surface of the side beam The two vertical surfaces are arranged opposite to each other, and the sixth bending plate is horizontal and close to the side plate of the connecting end wall.

Further, according to the box-reinforced side beam structure with buffering of the present invention, a buffering gap is left between the third bending plate and the first vertical surface.

Further, according to the box-reinforced side beam structure with buffering of the present invention, the second bending plate is a horizontal flat plate.

Further, according to the box-reinforced side beam structure with buffering of the present invention, the second vertical surface of the side beam is closely connected to the fifth bending plate.

Further, according to the box body reinforced side beam structure with buffering of the present invention, the box body is provided with an L-shaped ledge; the L-shaped ledge includes a horizontal side panel and a vertical wall panel; the horizontal side panels are connected The bottom edge of the vertical wall panel makes the L-shaped wall frame an L-shaped structure; the vertical wall panel constitutes the box wall; the side beam and the elastic side beam are arranged on the horizontal side panel .

A battery box according to the present invention includes a main box body; the main box body includes a box bottom plate and four L-shaped wall brackets; the four L-shaped wall brackets are welded to each other through the inclined end faces of the L-shaped wall brackets. Right-angled quadrilateral frame; the bottom plate of the box body is welded with four L-shaped ledges; the four L-shaped ledges are divided into two side wall frames and two end ledges; the side wall frames include vertical side wall panels and the horizontal side wall side panel; the side wall side panel is connected to the bottom edge of the side wall panel, so that the side wall frame has an L-shaped structure; the two side wall frames are arranged opposite and parallel, and the side wall side panel faces the inside; The frame includes a vertical end wall panel and a horizontal end wall side panel; the end wall side panel is connected to the bottom edge of the end wall panel, so that the end wall frame has an L-shaped structure; the two end wall frames are arranged opposite and parallel to each other, The end wall side panels face the inside; the two side wall panels and the two end wall panels constitute the four-sided box walls of the main box body; the end wall side panels of the end wall frame are provided with a reinforced side beam structure; The side beam structure is the above-mentioned box body reinforced side beam structure with buffer; both ends of the side beam and the elastic side beam are respectively connected with side wall frames.

Further, according to the battery box of the present invention, a middle beam is also arranged in the main box; the middle beam is parallel to the end wall frame and perpendicular to the side wall frame; the two ends of the middle beam are respectively erected on the side walls of the two side wall frames The side plates are welded and connected with the side wall panels; the middle beam divides the cavity in the main box into several sub-cavities.

Further, according to the battery box of the present invention, the thickness of the bottom plate of the box body is the same as that of the side wall edge plate and the end wall edge plate; The bottom plate of the body is connected to the middle beam by welding.

The technical effect of the present invention is as follows: when the battery box of the present invention is installed on an automobile, the two end ledges are located at the front and rear respectively, so that the front and rear of the battery box are provided with a box-reinforced side beam structure with buffers. When the car is hit by a frontal impact, the impact force that hits the box wall is transmitted to the side beam through the buffer, so that the impact force transmitted from the side beam to the battery in the battery box is greatly reduced. And the inclined end face connection between the L-shaped ledges, so that the impact force of the impact is easily directed to the two sides of the frame.

Description of drawings

FIG. 1 is a schematic top view of an embodiment of a battery box of the present invention.

FIG. 2 is an exploded schematic view of an embodiment of the battery box of the present invention.

FIG. 3 is a schematic three-dimensional structure diagram of a side wall frame.

Fig. 4 is a three-dimensional schematic diagram of the connection between the end ledge and the side beam.

Figure 5 is a structural exploded end view of the end ledge and side beam.

Figure 6 is an end view of the structural connection of the end ledge and side beam.

FIG. 7 is a schematic diagram of the deformation of the elastic side beam when the connection structure of the end ledge and the side beam is squeezed by an external force.

Figure 8 is an exploded top view of the structure of the end ledges and side beams.

Figure 9 is a top view of the connection between the side wall frame and the middle beam.

in,

1 is the bottom plate of the box;

2 is a side wall frame, 21 is a side wall panel, 22 is a side wall edge plate, 23 is a mounting block, 24 is a box fixing beam, and 242 is a box mounting hole;

3 is the end wall bracket, 31 is the end wall panel, 32 is the end wall side panel, 329 is the side beam fixing hole, 33 is the first connection port;

4 is the reinforced side beam structure, 41 is the side beam, 411 is the top surface, 412 is the bottom surface, 413 is the first vertical surface, 414 is the crimping slope, 415 is the second vertical surface, 416 is the inner side, and 419 is the side Beam mounting hole, 42 is the elastic side beam, 421 is the first bending plate, 422 is the second bending plate, 423 is the third bending plate, 424 is the oblique bending plate, 425 is the fifth bending plate, 426 is the sixth bending plate, 428 is the edge cavity, 429 is the bolt avoidance gap, and 43 is the buffer gap;

5 is the middle beam, 51 is the triangular connection block;

61 is the bottom plate of the control box, 62 is the side plate of the control box, 63 is the end plate of the control box, and 64 is the second wiring port;

901 is the main box, 902 is the control box, and 999 is the oblique end edge of the L-shaped ledge.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , a battery box with a tailor-welded structure includes a main box body 901 and a control box 902 . The main box 901 is used for accommodating the battery module of the battery pack, and includes the box bottom plate 1 and a right-angled quadrilateral frame surrounded by four L-shaped ledges. The right-angled quadrilateral frame encloses an accommodating cavity for accommodating the battery module. The box bottom plate 1 is located at the bottom of the accommodating cavity and is connected with four L-shaped ledges. The L-shaped ledge includes an elongated horizontal side panel and an elongated vertical wall panel. The horizontal side panel is connected to the bottom edge of the vertical wall panel, so that the L-shaped ledge has an elongated shape and an L-shaped cross-section. Both ends of the L-shaped ledge have inclined end surfaces 999, respectively. The inclined end face 999 is at an angle of 45 degrees. The two L-shaped ledges are connected by welding between the inclined end faces 999 inclined at an angle of 45 degrees to form a right-angle structure. The four L-shaped wall brackets are the side wall brackets 2 and the two end wall brackets 3 respectively.

The side wall frame 2, referring to FIG. 3 and FIG. 8, includes a side wall panel 21 and a side wall edge panel 22 which are integrally made of aluminum alloy profiles. The side wall panels 21 are vertically arranged elongated panels, and the sidewall edge panels 22 are horizontally arranged elongated panels. The side wall side panel 22 is connected to the bottom edge of the side wall panel 21, so that the cross section of the side wall frame 2 is an L-shaped structure. The two side wall frames 2 are arranged opposite and parallel; wherein, the side wall panels 21 face the outside, and the side wall side panels 22 face the inside. Both ends of the two side wall brackets 2 are welded and connected to the two end wall brackets 3 through inclined end surfaces 999 respectively, and are perpendicular to the end wall brackets 3 . A plurality of mounting blocks 23 are arranged on the side wall edge plate 22 . The mounting block 23 is provided with screw holes for fixing the battery module placed in the main box 901 . A box fixing beam 24 is connected to the outer side of the side wall panel 21 . The box body fixing beam 24 and the side wall panel 21 are connected by welding. The box fixing beam 24 is provided with a plurality of box mounting holes 242 for fixing the battery box. In the side wall frame 2, the side wall wall panels 21 are the vertical wall panels of the aforementioned L-shaped wall frame, and the side wall side panels 22 are the horizontal side panels of the aforementioned L-shaped wall frame.

The end wall bracket 3, referring to FIGS. 4 , 5 , 6 , 7 and 8 , includes an end wall panel 31 and an end wall side panel 32 integrally made of aluminum alloy profiles. The end wall panel 31 is a vertically arranged elongated plate body, and the end wall side panel 32 is a horizontally arranged elongated plate body. The end wall side panel 32 is connected to the bottom edge of the end wall panel 31 so that the end wall frame 3 has an L-shaped cross section. The two end wall brackets 3 are arranged opposite and parallel; wherein, the end wall panel 31 faces the outer side, and the end wall side panel 32 faces the inner side. Both ends of the two end wall brackets 3 are connected to the two side wall brackets 2 by welding through inclined end surfaces 999 respectively, and are perpendicular to the side wall brackets 2 . In the end wall bracket 3, the end wall wall panel 31 is the vertical wall plate of the aforementioned L-shaped wall bracket, and the end wall side plate 32 is the horizontal side plate of the aforementioned L-shaped wall bracket.

The end wall edge panels 32 and the side wall edge panels 22 have the same thickness. After four L-shaped ledges are welded to form a right-angled quadrilateral frame, the top surfaces of the end wall side plates 32 and the side wall side plates 22 are flush with each other, and the bottom surfaces are flush with each other. The thickness of the box bottom plate 1 is the same as the thickness of the end wall edge plate 32 and the side wall edge plate 22 . The four sides of the box bottom plate 1 are respectively connected with the inner sides of the end wall edge plate 32 and the side wall edge plate 22 by welding, and the top surface of the box bottom plate 1 is flush with the top surface of the end wall edge plate 32 and the side wall edge plate 22 The bottom surface of the box bottom plate 1 is flush with the bottom surfaces of the end wall side plate 32 and the side wall side plate 22 . The two end wall panels 31 and the two side wall panels 21 constitute the four-sided box walls of the main box body 901 .

The main box 901 is provided with a reinforcing beam structure. The reinforced beam structure includes a reinforced side beam structure 4 and a middle beam 5 . Among them, the reinforcement side beam structure 4 is a box body reinforcement beam structure with buffer, which is arranged on the end wall side plate 32 of the end wall frame 3, referring to Fig. 4, Fig. 5, Fig. 6 and Fig. 7, including elastic side beams 42 and side beams 41.

The side beams 41 are made of aluminum alloy profiles, are elongated, and are parallel to the end wall panels 31, and the two ends are connected to the side wall frames 2 respectively, including the top surface 411, the bottom surface 412, the first vertical surface 413, the withholding The inclined surface 414 , the second vertical surface 415 and the inner side surface 416 . The first vertical surface 413 is vertical and connects to the top surface 411 of the side beam 41 , the second vertical surface 415 is vertical and connects to the bottom surface 412 ; the inner side surface 416 is vertical and connects to the top surface 411 and the bottom surface 412 respectively. The first vertical surface 413 and the second vertical surface 415 are connected by a crimping inclined surface 414 . The crimping inclined surface 414 is an inclined plane, so that the top surface 411 of the side beam 41 is wider than the bottom surface 412 , and a stepped groove is formed between the crimping inclined surface 414 and the second vertical surface 415 . The bottom surface 412 of the side beam 41 is in close contact with the side plate 32 of the connecting end wall. The crimping slope 414 is used for crimping the elastic side beam 42 .

The elastic side beam 42 is located between the side beam 41 and the end wall panel 31 , and is parallel to the end wall frame 3 . The elastic side beam 42 is formed by bending the aluminum alloy plate body, including the first bending plate 421, the second bending plate 422, the third bending plate 423, the oblique Bending plate 424 , fifth bending plate 425 and sixth bending plate 426 . The first bending plate 421 , the third bending plate 423 and the fifth bending plate 425 are vertical, the second bending plate 422 and the sixth bending plate 426 are horizontal, and the inclined bending plate 424 is inclined. The first bending plate 421 , the second bending plate 422 , the third bending plate 423 , the oblique bending plate 424 , the fifth bending plate 425 and the sixth bending plate 426 enclose the edge cavity 428 .

The elastic side beam 42 is located between the side beam 41 and the end wall panel 31 , and the two sides are in close contact with the side beam 41 and the end wall panel 31 respectively. Specifically, the vertical first bending plate 421 is close to the inner side of the connecting end wall panel 31, the vertical third bending plate 423 is arranged opposite to the first vertical surface 413, and the horizontal sixth bending plate The plate 426 is in close contact with the connecting end wall side plate 32 , the vertical fifth bending plate 425 is arranged opposite to the second vertical surface 415 of the side beam 41 , and the withholding slope 414 of the side beam 41 is in close contact with and presses the elastic side beam 42 The inclined oblique bending plate 424. The oblique bending plate 424 is matched with the crimping slope 414 of the side beam 41 . The side beam 41 is crimped on the elastic side beam 42 and the elastic side beam 42 is crimped on the end wall panel 32 through the crimping and pressing of the crimping slope 414 of the side beam 41 to the obliquely bent plate 424 of the elastic side beam 42 so that the side beams 41 are also supported by the elastic side beams 42 .

The side beam 41 is fixed on the end wall side plate 32 by bolts, and then the elastic side beam 42 is buckled on the end wall frame 3 . Specifically, the side beams 41 are provided with side beam mounting holes 419 , the end wall side plates 32 are provided with side beam fixing holes 329 , and the elastic side beams 42 are provided with bolt escape holes 429 . The bolts for fixing the side beams 41 pass through the side beam mounting holes 419 and the bolts avoid the holes 429 and then connect to the side beam fixing holes 329 .

A buffer structure is formed between the side beam 41 and the elastic side beam 42 . Specifically, the beam mounting hole 419 is a waist-shaped hole, and the longitudinal direction of the waist-shaped hole is perpendicular to the end wall panel 31, so that when the side beam 41 is squeezed by the internal battery module, under the guidance of the waist-shaped hole The end wall panel 31 of the end wall bracket 3 can be slidably displaced. For example, when the end wall bracket 3 is hit, the side beam 41 slides and displaces relative to the end wall bracket 3 toward the end wall panel 31 . There is a buffer gap 43 between the third bending plate 423 and the first vertical surface 413 . The buffer gap 43 constitutes a space in which the side beam 41 slides. The elastic side beam 42 itself has elasticity. When the side beam 41 slides and displaces toward the end wall panel 31 , the elastic side beam 42 is squeezed by the withholding inclined surface 414 and the second vertical surface 415 of the side beam 41 . , the elastic side beam 42 is deformed under the action of its own elasticity. Referring to FIG. 7 , after the elastic side beam 42 is deformed, the third bending plate 423 changes from vertical to inclined.

In this embodiment, the second bending plate 422 is a horizontal flat plate connecting the first bending plate 421 and the third bending plate 423. Those skilled in the art understand that the second bending plate 422 may also be curved The arc-shaped plate can even be a circular arc plate connecting the first bending plate 421 and the third bending plate 423 .

In addition, in this embodiment, the second vertical surface 415 of the side beam 41 is closely connected to the fifth bending plate 425 . Those skilled in the art understand that a gap may also be left between the second vertical surface 415 and the fifth bending plate 425 .

In addition, the two ends of the side beam 41 and the side wall frame 2 can be connected by welding, or can be connected movably.

1 , 2 and 8 , the middle beam 5 is arranged in the main box 901 , so that the cavity in the main box 901 is divided into several sub-cavities by the middle beam 5 . In the example of FIG. 1 and FIG. 2 , there is one middle beam 5 , and the cavity in the main box 901 is divided into two sub-cavities by the middle beam 5 . Those skilled in the art understand that two or three middle beams 5 may also be provided. The middle beam 5 is parallel to the end wall bracket 3 and perpendicular to the side wall bracket 2 . Both ends of the middle beam 5 are respectively erected on the side wall side plates 22 of the two side wall frames 2 and connected to the side wall wall plates 21 by welding. Specifically, triangular connection blocks 51 are respectively provided on both sides of both ends of the middle beam 5 . The end face of the middle beam 5 is connected to the side wall panel 21 by welding, the bottom surface of the middle beam 5 is connected to the side wall side plate 22 by welding, the end side of the middle beam 5 is connected to the triangular connecting block 51 by welding, and the triangular connecting block 51 is connected to the side by welding. The wall panels 21 are welded together. Further, the bottom of the middle beam 5 can also be connected to the bottom plate 1 of the box body by welding.

The control box 902 is used to accommodate components such as battery management unit modules, electrical components, and liquid cooling pipe joints of the battery pack. The control box 902 is connected to the outside of one of the end wall brackets 3 . The control box 902 includes a control box bottom plate 61 , two control box side plates 62 and a control box end plate 63 . The two side panels 62 of the control box are vertically welded and connected to the end wall panel 31 of the end wall frame 3 . The control box end plate 63 is parallel to the end wall plate 31, and the two ends are respectively welded to the control box side plate 62, so that the control box end plate 63, the two control box side plates 62 and the end wall plate 31 are enclosed for A cavity housing the battery management unit module. The control box bottom plate 61 is arranged at the bottom of the cavity, and is welded to connect the control box end plate 63 , the two control box side plates 62 and the end wall plate 31 . The control box 902 and the main box 901 communicate with each other through the first wiring port 33 provided on the end wall panel 31 . Therefore, the wire harness can pass through the first wiring port 33 to connect the battery management unit module in the control box 902 to the battery module and the temperature control mechanism in the main box 901 . The control box end plate 63 is provided with a second connection port 64 for connecting the battery management unit module to an external mechanism.

Claims

A box body reinforced side beam structure with buffering is characterized in that it comprises a side beam (41) arranged at the inner edge of the box, and a side beam (41) with which the side beam (41) is pressed against the side beam (41) and the box wall. The elastic side beams (42) between the side beams (41) are provided with waist-shaped holes, and are connected to the bottom of the box through bolts provided in the waist-shaped holes, and are parallel to the box wall; the waist-shaped holes The length direction is perpendicular to the box wall, so that the side beam (41) can be displaced toward the box wall under the action of external force; when the side beam (41) is displaced toward the box wall, the side beam (41) is displaced toward the box wall. The side beams (41) are supported by the elastic deformation of the elastic side beams (42).
The box-reinforced side beam structure with buffering according to claim 1, wherein the side beam (41) is provided with a crimping slope (414) for crimping the elastic side beam (42); the The elastic side beam (42) is formed by bending a plate body, and is provided with an oblique bending plate (424) matched with the withholding inclined surface (414); the withholding inclined surface (414) is in close contact with the oblique bending The plate (424) is crimped on the obliquely bent plate (424).
The box-reinforced side beam structure with buffering according to claim 2, wherein the side beam (41) comprises a top surface (411), a bottom surface (412), a first vertical surface (413), a crimping inclined surface (414) and a second vertical surface (415); the first vertical surface (413) is vertical and connects to the top surface (411) of the side beam (41), and the second vertical surface (415) is vertical and connects to the bottom surface (412); the first vertical surface (413) and the second vertical surface (415) are connected by a crimping slope (414); the crimping slope (414) makes the top surface (411) of the side beam (41) higher than the bottom surface (412) width; the elastic side beam (42) includes a first bending plate (421), a second bending plate (422), and a third bending plate (423) formed by bending the plate body in sequence. ), the oblique bending plate (424), the fifth bending plate (425) and the sixth bending plate (426); wherein, the first bending plate (421) is vertical and close to the connecting end wall panel ( 31); the third bending plate (423) is vertical and is arranged opposite to the first vertical surface (413) of the side beam (41), and the fifth bending plate (425) is vertical and is opposite to the first vertical surface (413) of the side beam (41). The second vertical surfaces (415) are arranged opposite to each other, and the sixth bending plate (426) is horizontal and closely abuts the connecting end wall side plate (32).
The box-reinforced side beam structure with buffering according to claim 3, characterized in that a buffering gap (43) is left between the third bending plate (423) and the first vertical surface (413).
The box-reinforced side beam structure with buffering according to claim 3, characterized in that, the second bending plate (422) is a horizontal flat plate.
The box-reinforced side beam structure with buffering according to claim 3, characterized in that the second vertical surface (415) of the side beam (41) is closely connected to the fifth bending plate (425).
The box body reinforced side beam structure with buffering according to any one of claims 1 to 6, wherein the box body is provided with an L-shaped ledge; the L-shaped ledge comprises a horizontal side plate and a vertical side plate. straight wall panels; the horizontal side panels are connected to the bottom edges of the vertical wall panels, so that the L-shaped ledges have an L-shaped structure; the vertical wall panels constitute the box walls; the side beams (41 ) and elastic side beams (42) are arranged on the horizontal side panels.
A battery box, characterized in that it includes a main box body (901); the main box body (901) includes a box bottom plate (1) and four L-shaped ledges; the four L-shaped ledges pass through L The oblique end faces (999) of the ledges are welded to each other to form a right-angled quadrilateral frame; the bottom plate (1) of the box body is welded with four L-shaped ledges; the four L-shaped ledges are divided into two side wall brackets (2) and two end wall brackets (3); the side wall bracket (2) includes a vertical side wall panel (21) and a horizontal side wall side panel (22); the side wall side panel (22) is connected to the side wall wall The bottom edge of the plate (21) makes the side wall frame (2) have an L-shaped structure; the two side wall frames (2) are arranged opposite and parallel, and the side wall side plate (22) faces the inside; the end wall frame (3) includes A vertical end wall panel (31) and a horizontal end wall edge panel (32); the end wall edge panel (32) is connected to the bottom edge of the end wall panel (31), so that the end wall bracket (3) is L-shaped The two end wall brackets (3) are arranged opposite and parallel, and the end wall side panels (32) face the inside; the two side wall panels (21) and the two end wall panels (31) constitute the main box The four-sided box wall of the body (901); the end wall side plate (32) of the end ledge (3) is provided with a reinforced side beam structure (4); The box body with buffer strengthens the side beam structure; the two ends of the side beam (41) and the elastic side beam (42) are respectively connected to the side wall frame (2).
The battery box according to claim 4, wherein the main box body (901) is further provided with a middle beam (5); the middle beam (5) is parallel to the end ledges (3) and perpendicular to the side walls frame (2); both ends of the middle beam (5) are respectively erected on the side wall side plates (22) of the two side wall frames (2) and connected with the side wall wall plates (21) by welding; the middle beam (5) will The cavity in the main box (901) is divided into several sub-cavities.
The battery box according to claim 9, characterized in that the thickness of the box bottom plate (1) is the same as that of the side wall edge plate (22) and the end wall edge plate (32); the four sides of the box bottom plate (1) are respectively The two side wall side plates (22) and the two end wall side plates (32) are connected by welding; the bottom plate (1) of the box body is connected by welding with the middle beam (5).