CN115832568A - Box body on pure electric commercial vehicle power battery box - Google Patents

Abstract

The invention discloses an upper box body of a pure electric commercial vehicle power battery box. The shape of the bottom surface is the same as that of the top surface, and the side length of the bottom surface is longer than the side length of the top surface; each corner of the top surface and each corner of the bottom surface are connected by a corner profile; the corner profile includes a straight edge connected at the end; The three corner profiles at each vertex of the top surface of the upper box are riveted through the inner connecting angle plate; the flat plate is bonded and sealed with the edge of the straight plate to form an upper box with an open bottom. The invention innovates on the structure and technology of the upper box of the integral battery box, and can use small extruded profiles, flat plates, and connecting angle plates to realize a large-sized square-shaped sealing structure through a riveting process, and provide support strength and sealing. Port, as a lightweight and extensible solution, saves investment in large equipment and molds, and has flexible size expansion.

Description

Pure electric commercial vehicle power battery box upper box

technical field

The invention relates to a power battery box, in particular to an upper box body of a pure electric commercial vehicle power battery box.

Background technique

The power battery box of a new energy passenger car is divided into an upper box and a lower box. The upper box, that is, the upper cover, bears a small load. The strength and protective performance of the box cover itself are mainly considered to ensure that the protection requirements and mechanical safety performance are met. .

At present, the relatively mature upper cover materials mainly include sheet metal upper cover, aluminum sheet upper cover, and composite material upper cover. There are two forming processes for sheet metal and aluminum sheet upper covers: bending + tailor welding and integrated stamping forming, composite material Generally, one-piece molding (molding or SMC) is used.

For the consideration of light weight, the upper cover is generally made relatively thin, but for the battery of general pure electric vehicles, the size of the upper cover is relatively large, and it is necessary to add local convex hulls or ribs; in terms of processing technology, integrated Forming needs to consider the draft angle, fillet radius, and the depth of drawing is limited by the material and process; while the bending + tailor welding process is limited by the bending size, tailor welding position and the feasibility of anti-corrosion paint.

Since pure electric commercial vehicles require a large power battery, most of them currently use the method of combining multiple standard packages. For the standard packages on the outside of the frame, a protective cover is often added. For the standard package on the back of the cab , the protective plate is often installed outside the installation frame of the standard package. The protective cover and the protective plate do not have the function of sealing the box and can only play a certain role in shielding and protection.

Due to the large amount of electricity demanded by pure electric commercial vehicles, the existing technology adopts a battery box structure equipped with multiple standard packs and a protective cover. Due to its own structural characteristics, sufficient installation and wiring should be left between each standard pack. The gap, the volume and weight energy density of the standard package itself is limited, and it has been difficult to meet the needs of pure electric trucks for battery systems to increase power, reduce weight, reduce volume, increase energy density and reduce costs; with the advancement of battery technology and the With the development of the automobile industry, CTC or MTB technology for direct assembly of batteries or modules has become possible.

With the development of battery CTC/MTB technology, the power battery system of pure electric commercial vehicles tends to be integrated and centralized, and a large-sized sealed box needs to be configured. Due to the large dimensions, length, width and height, traditional stamping is used. Or non-metallic compression molding is very difficult, requiring large-scale equipment and mold investment, and different box sizes require different molds.

However, if the commercial vehicle battery box adopts the structure of the upper and lower boxes of the passenger car, due to its very large size, two of the length, width, and height dimensions of the battery box will be close to or exceed 2 meters. If the upper box is integrated The process requires extra-large molds and integrated molding equipment, and structures such as draft angles and rounded corners will reduce space utilization; and if large-size thin plate materials adopt the bending + tailor welding process, their own strength, corrosion resistance and Sealing performance is difficult to guarantee.

Contents of the invention

In view of the problems existing in the background technology, the object of the present invention is to provide an upper box body of a pure electric commercial vehicle power battery box with large capacity, high space utilization rate, and reliable connection and sealing.

In order to achieve the above purpose, the upper box of the pure electric commercial vehicle power battery box designed by the present invention includes:

The side of the top surface of the upper box formed by a plurality of corner profiles, and the side of the bottom surface of the upper box formed by a plurality of spigot profiles; the bottom surface is the same shape as the top surface, and the side length of the bottom surface is longer than the side length of the top surface;

Each corner of the top surface and each corner of the bottom surface are connected by a corner profile;

The corner profiles include straight edges connected at the ends; the three corner profiles at each vertex of the top surface of the upper box are riveted through the inner connection angle plate;

The flat plate is bonded and sealed with the edge of the straight plate to form an upper box with an open bottom.

Preferably, the outer wall of the straight edge is bonded to the inner wall of the planar plate.

Further preferably, the outer wall of the straight edge is provided with at least one groove along its length direction. In this way, the bonding effect between the straight edge and the flat plate is increased.

Further preferably, a boss is provided at the connection of the ends of the straight board edges. In this way, it is possible to conveniently position and install the flat plate.

Still further preferably, the height of the boss is equal to the thickness of the planar plate.

Preferably, the angled profile is integrally extruded.

Preferably, the inner connecting corner plate is an opening surrounded by three quadrilateral plates of equal thickness which share a vertex and adjacent quadrilateral plates share a side.

Further preferably, the straight edge is riveted with the quadrilateral plate; the riveting holes are located on the diagonal of the quadrilateral plate.

Still further preferably, the diagonal of the riveting holes on the same quadrilateral plate does not pass through the common vertices of the three quadrilateral plates.

Preferably, the inner connecting angle plate is integrally stamped and formed.

Preferably, the straight edge is provided with cut corners, and the intersection line of the cut corners is adapted to the common sides and vertices of the quadrilateral plate, so that the inner wall of the straight edge is attached to the outer wall of the quadrilateral plate.

Preferably, the spigot profile includes a horizontal plate, a vertical plate located on both sides of the horizontal plate and vertically connected to two ends of the horizontal plate; the plane plate is bonded to one of the vertical plates, and the plane plate and the horizontal plate are respectively located Both sides of the riser are glued above.

Further preferably, the joints of the spigot profiles surrounding the upper box are riveted through the outer connecting gussets.

As a preferred solution, the outer connecting corner plate is an opening surrounded by three quadrilateral plates of equal thickness, which share a vertex and adjacent quadrilateral plates share a side.

Preferably, the end of the vertical plate that is not bonded to the planar plate is inserted into the outer connecting angle plate and riveted by rivets, and the line connecting the centers of the riveting holes on the same quadrilateral plate passes through the common vertices of the three quadrilateral plate.

Preferably, the quadrilateral plate without riveting holes on the outer connecting angle plate is provided with a notch, and the vertical plate bonded with the planar plate is abutted against the notch.

Preferably, the end of the spigot-shaped plate is provided with a cut corner, and the intersection line of the cut corner is adapted to the common side and apex of the quadrilateral plate, so that the outer wall of the vertical plate that is not bonded to the planar plate and the inner wall of the quadrilateral plate fit.

Preferably, the spigot profile is integrally extruded.

The beneficial effects of the present invention are as follows: the planar plate and the angled profile, the joint profile, the connecting angle plate, etc. are connected by rivets and glue; The profile forms a peripheral reinforcement and sealing surface at the opening boundary of the bottom of the upper box.

Since the extruded profile has the characteristics of uniform cross-section and the length of a single piece is not limited by the process, the extruded profile is used to form the edge and seam of the upper box, which can achieve a box size of 2 to 3 meters on a single side, and overcome the large size. Difficult box forming, no need to invest in large-scale (molding/stamping) equipment; the upper box formed by the combination of profiles and plates does not require a draft angle, and can achieve a square shape and internal volume, which is more conducive to the internal battery mold The arrangement of components such as groups/cells, compared with the one-piece upper box with a draft angle, has a higher space utilization rate

Adopting the technical scheme of the present invention to innovate on the structure and process of the upper box body of the integral battery box, small extruded profiles, flat plates, and connecting corner plates can be used to realize a large-sized square-shaped sealing structure through a riveting process and provide support strength. As a lightweight and extensible solution, it saves investment in large-scale equipment and molds, and has flexible size expansion.

Description of drawings

Fig. 1 is a schematic perspective view of the present invention, wherein the plane plate is not shown;

Fig. 2 is the enlarged schematic diagram of place A in Fig. 1;

Fig. 3 is the enlarged schematic diagram of place B in Fig. 1;

Fig. 4 is the structural representation of corner profile of the present invention;

Fig. 5 is the bonding schematic diagram of the corner profile and the plane plate of the present invention;

Fig. 6 is a schematic diagram of the bonding of the spigot profile and the plane plate of the present invention;

Fig. 7 is a schematic diagram of an explosion at the apex of the top surface of the upper box of the present invention;

Fig. 8 is a schematic exploded view at the apex of the bottom surface of the upper box of the present invention.

Detailed ways

The technical solution (including the preferred technical solution) of the present invention will be further described in detail below by means of the accompanying drawings and listing some optional embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figures 1 to 8, the upper box body of the pure electric commercial vehicle power battery box designed by the present invention includes: the edge of the top surface of the upper box body composed of a plurality of corner profiles 1, and a plurality of spigot profiles 2 The side of the bottom surface of the upper box body; the bottom surface is the same shape as the top surface, and the side length of the bottom surface is longer than the side length of the top surface; each corner of the top surface and each corner of the bottom surface are connected by a corner profile 1; the The corner profile includes the straight edge 1.1 connected at the end; the three corner profiles 1 at each apex of the top surface of the upper box are riveted through the inner connection angle plate 3; the flat plate 5 is bonded and sealed with the straight edge 1.1 to form a bottom opening Upper box.

The plane plate 5 is connected with the angled profile 1, the seam profile 2, the connecting angle plates 3, 4, etc. through rivets and glue; the angled profile 1 forms the ridge line of the upper box, and the plane plate 5 forms the surfaces of the upper box, and the seams The profile 2 forms a peripheral reinforcement and sealing surface at the bottom opening boundary of the upper box body.

In some optional embodiments of the present invention, the outer wall of the straight plate edge 1.1 is bonded to the inner wall of the plane plate 5 .

In some optional embodiments of the present invention, at least one groove 1.2 is provided on the outer wall of the straight edge 1.1 along its length direction. In this way, the bonding effect between the straight edge 1.1 and the flat plate 5 is increased.

In some optional embodiments of the present invention, a boss 1.2 is provided at the junction of the ends of the straight plate sides 1.1. In this way, the plane plate 5 can be conveniently positioned and installed.

In some optional embodiments of the present invention, the height of the boss 1.2 is equal to the thickness of the planar plate 5 .

In some optional embodiments of the present invention, the angled profile 1 is integrally extruded.

In some optional embodiments of the present invention, the inner connecting corner plate 3 is an opening surrounded by three equal-thickness quadrangular plates which share a vertex and adjacent quadrangular plates share a side.

In some optional embodiments of the present invention, the straight plate edge 1.1 is riveted with the quadrilateral plate; the riveting holes are located on the diagonal of the quadrilateral plate.

In some optional embodiments of the present invention, the diagonal of the riveting holes on the same quadrilateral plate does not pass through the common vertices of the three quadrilateral plates.

In some optional embodiments of the present invention, the inner connecting angle plate 3 is integrally stamped and formed.

In some optional embodiments of the present invention, the straight edge 1.1 is provided with cut corners, and the intersection line of the cut corners is adapted to the common sides and vertices of the quadrilateral plate, so that the inner wall of the straight edge 1.1 is attached to the outer wall of the quadrilateral plate .

In this embodiment, the angled profile 1 is a long profile extruded with equal cross-section. A boss 1.2 is set at the center, and the thickness of the boss 1.2 is consistent with that of the flat plate 5; parallel grooves are set on the outer mounting surface to enhance the bonding effect.

At the four corners of the top surface of the upper box, three angled profiles 1 are vertical in pairs, and the butt ends are cut at 45° angles on both sides, and the pointed ends are docked at one point, which is one of the top corner vertices of the upper box. , the three angled profiles 1 are provided with a connection through hole with a sunken platform on the installation surface behind the docking point, and the sunken platform is located on the outer installation surface, and is connected and fixed with the inner connection angle plate by the countersunk rivet to form the contour edge of the upper box side.

The shape of the inner connection angle plate 3 is three equal-thickness plates combined with two vertical squares, which are formed by punching and cutting. Each square surface has a through hole corresponding to the connecting through hole of the connecting profile. both sides of the corner. The inner connection angle plate is lined on the inner surface of the joint of the angled profile, and the countersunk rivet extends from the outer mounting surface of the angled profile, and the internal connection angle plate 3 and the angled profile 1 are connected by riveting to provide connection strength. Glue is applied to the butt joint surface of the inner connecting angle plate 3 before, and the colloid guarantees that the butt joints of the three knuckle profiles 1 are sealed.

After the knuckle profile 1 at the top corner of the upper box is docked, its outer mounting surface provides the bonding basis for the plane plate 5, and the outer surface of the upper box is formed by the bonding of the plane plate 5, including the top surface and the peripheral surface.

In some optional embodiments of the present invention, the mouth-stop profile 2 includes a horizontal plate 2.1, a vertical plate located on both sides of the horizontal plate and vertically connected to the two ends of the horizontal plate 2.1; the plane plate 5 and one of the vertical plates For bonding, in this embodiment, it is the first vertical board 2.2, and the planar plate 5 and the horizontal board 2.1 are respectively located on the two sides of the above-mentioned vertical board to be bonded, that is, the first vertical board 2.2 in this embodiment.

In some optional embodiments of the present invention, the joints of the spigot profiles 2 surrounding the upper box are riveted through the outer connecting gussets 4 .

In some optional embodiments of the present invention, the outer connecting gusset 4 is an opening surrounded by three equal-thickness quadrilateral plates that share a vertex and adjacent quadrilateral plates share a side.

In some optional embodiments of the present invention, the vertical plate that is not bonded to the planar plate 5—that is, the end of the second vertical plate 2.3 is inserted into the outer connecting gusset 4 and riveted by rivets, and the same quadrilateral plate The line connecting the centers of the riveting holes passes through the common vertices of the three quadrilateral plates.

In some optional embodiments of the present invention, a notch 4.1 is provided on the quadrilateral plate without riveting holes on the outer connecting angle plate 4, and the vertical plate bonded with the plane plate—that is, the first vertical plate 2.2 abuts On said seam 4.1.

In some optional embodiments of the present invention, the end of the spigot-shaped plate 2 is provided with a cut corner, and the intersection line of the cut corner is adapted to the common side and apex of the quadrilateral plate, so that the vertical plate not bonded to the plane plate Board—that is, the outer wall of the second vertical board 2.3 is attached to the inner wall of the quadrilateral plate.

In some optional embodiments of the present invention, the mouth-stop profile 2 is integrally extruded.

The spigot profile 2 is an extruded profile with equal cross-section, the cross-section is Z-shaped, the inner upper vertical surface is bonded with the outer surface bottom of the upper box along the peripheral opening, the lower horizontal surface is the sealing surface, and the outer lower vertical surface is at the corner butt joint It is fixed with the external connecting gusset by glue riveting.

The shape of the outer connection angle plate 4 is three equal thickness plates combined with two vertical squares, which are formed by cutting after stamping, and are formed by cutting after stamping. There is a through hole corresponding to the connection through hole of the connecting profile, the hole is located on the diagonal, and the plane connected to the upper surface of the spigot profile has a square gap to avoid the vertical joint space on the spigot profile.

The angled profile is bonded to the plane plate, and the seam structure of the profile is bonded to the plane plate. The seam is conducive to the positioning of the plate and bonding and filling, ensuring a reliable sealing connection.

The angled profile and the connecting angle plate are connected by countersunk rivets, which can realize the combination process of the profile edge skeleton, and can directly build the bonding foundation of the flat plate, and also provide the necessary strength and rigidity of the upper box.

After the spigot profile is bonded to the opening of the lower box along the periphery, the local structure of the opening of the box is strengthened, and a straight sealing reference surface is provided.

In this embodiment, the upper box body of a large-sized power battery box has a length of more than 1 meter on one side, which is difficult to process by conventional integral molding technology; the top surface and the vertical surface along the periphery are composed of 5 flat plates, and 8 corner profiles Together with the 4 inner connecting angle plates to form the edge of the box body, 4 spigot profiles and 4 outer connecting angle plates form the peripheral structure of the bottom opening of the upper box body, forming a large-sized upper box structure with a square shape overall.

The corner profile is a long profile extruded with equal cross-section. The overall cross-section is at a 90° equilateral right angle. It provides two horizontal mounting surfaces on the inner and outer sides and two vertical mounting surfaces on the inner and outer sides. The outer mounting surface is provided with a boss at the intersection. The thickness of the boss is consistent with that of the flat plate; two parallel grooves are set on the outer mounting surface to enhance the bonding effect;

At the four corners of the top surface of the upper box, three corner profiles are perpendicular to each other, and the butt ends are cut at 45° angles on both sides. The angled profile is provided with a connection through hole with a sinking platform on the mounting surface behind the docking point. The sinking platform is located on the outer mounting surface, and the inner connecting angle plate is lined in the angled profile. The surface is bonded, and the inner connection angle plate is connected and fixed by the countersunk rivet and the corner profile. The countersunk head side of the rivet is located on the outside. Glue is applied to the butt joint surface of the connection angle plate before riveting. The glue ensures the seam sealing of the three corner profiles. Forms the contour edge of the upper box.

The shape of the inner connection angle plate is three equal thickness plates combined with two vertical squares, which are formed by punching and cutting. Each square surface has a through hole corresponding to the connecting through hole of the connecting profile, and the holes are located at the opposite corners. both sides of the line.

The shape of the outer connection angle plate is three equal-thickness plates combined with two vertical squares, which are formed by cutting after stamping, and are formed by cutting after stamping. The through hole corresponding to the connection through hole of the connection profile is located on the diagonal, and the plane connected to the upper surface of the spigot profile has a square gap to avoid the vertical joint space on the spigot profile.

The spigot profile is an extruded profile with equal cross-section. The outer connection angle plate is glued and riveted, connected by countersunk rivets, and the side of the countersunk head is on the inner side of the profile.

There are support surfaces for the boards and profiles at the corners of the opening at the bottom of the upper box to ensure reliable gluing.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made under the spirit and principles of the present invention are included in the within the protection scope of the present invention.

Claims (10)

1. An upper box body of a power battery box for a pure electric commercial vehicle, characterized in that it comprises: The side of the top surface of the upper box formed by a plurality of corner profiles, and the side of the bottom surface of the upper box formed by a plurality of spigot profiles; the bottom surface is the same shape as the top surface, and the side length of the bottom surface is longer than the side length of the top surface; Each corner of the top surface and each corner of the bottom surface are connected by a corner profile; The corner profiles include straight edges connected at the ends; the three corner profiles at each vertex of the top surface of the upper box are riveted through the inner connection angle plate; The flat plate is bonded and sealed with the edge of the straight plate to form an upper box with an open bottom. 2. The upper box body of the pure electric commercial vehicle power battery box according to claim 1, characterized in that: the outer wall of the straight side is bonded to the inner wall of the plane plate; the outer wall of the straight side is provided with at least one line along its length direction. groove. 3. The upper box body of the pure electric commercial vehicle power battery box according to claim 1 or 2, characterized in that: a boss is provided at the connection of the edge ends of the straight plate; the height of the boss and the thickness of the plane plate equal. 4. The upper box body of the pure electric commercial vehicle power battery box according to claim 1, characterized in that: the inner connecting angle plate is a common vertex surrounded by three equal-thickness quadrilateral plates, and the adjacent quadrilateral plates have a total of A side opening piece. 5. The upper box body of the pure electric commercial vehicle power battery box according to claim 4, characterized in that: the straight plate side is riveted with the quadrilateral plate; the riveting hole is located on the diagonal of the quadrilateral plate; the same quadrilateral The diagonal line where the riveting holes are located on the plate does not pass through the common vertices of the three quadrilateral plates; the edge of the straight plate is provided with cut corners, and the intersection line of the cut corners is adapted to the common sides and vertices of the quadrilateral plates, so that the straight plate The inner wall of the side is attached to the outer wall of the quadrilateral plate. 6. The upper box body of the pure electric commercial vehicle power battery box according to claim 1, characterized in that: the mouth profile includes a horizontal plate, which is located on both sides of the horizontal plate and whose ends are respectively vertically connected to the two ends of the horizontal plate vertical boards; the plane board is bonded to one of the vertical boards, and the plane board and the horizontal board are respectively located on both sides of the above-mentioned vertical boards to be bonded. 7. The upper box body of the pure electric commercial vehicle power battery box according to claim 1 or 6, characterized in that: the joints of the spigot profiles surrounding the upper box body are riveted by the outer connecting gussets. 8. The upper box body of the pure electric commercial vehicle power battery box according to claim 7, characterized in that: the outer connecting corner plate is a common vertex surrounded by three equal-thickness quadrilateral plates, adjacent quadrilateral plates Open pieces that share one side. 9. The upper box body of the pure electric commercial vehicle power battery box according to claim 8, characterized in that: the end of the vertical plate that is not bonded to the plane plate is inserted into the outer connecting angle plate and riveted by rivets, and the same quadrilateral plate The connecting line of the center of the riveting hole above passes through the common vertices of the three quadrilateral plates; the ends of the spigot-shaped plates are provided with cut corners, and the intersection line of the cut corners is adapted to the common sides and vertices of the quadrilateral plates, so that no The outer wall of the vertical plate bonded to the flat plate is attached to the inner wall of the quadrilateral plate 10. The upper box body of the pure electric commercial vehicle power battery box according to claim 9, characterized in that: the quadrilateral plate without riveting holes on the outer connecting angle plate is provided with a stopper, and the flat plate is bonded The riser abuts against the notch.

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