CN210349941U

CN210349941U - Power battery box

Info

Publication number: CN210349941U
Application number: CN201921707020.7U
Authority: CN
Inventors: 程刚
Original assignee: Shape Auto Parts China Co ltd
Current assignee: Shape Auto Parts China Co ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-04-17
Anticipated expiration: 2029-10-12

Abstract

The utility model belongs to the technical field of power battery, a power battery box is disclosed, this power battery box, include: the box cover comprises a main body and a connecting part, and the connecting part is arranged at the edge of the main body; the box body comprises a bottom plate, a frame and sealant, wherein the frame is annular and is internally provided with a cavity, and the head end of the frame is hermetically connected with the tail end of the frame; the frame is provided with a first side surface and a second side surface which are oppositely arranged, the first side surface is hermetically connected with the bottom plate, and the second side surface is provided with a plurality of mounting holes at intervals; the sealant is filled in the cavity at the joint of the frames to ensure that the joint is sealed; the connecting pieces are arranged in the mounting holes and connect the connecting portions in a sealing mode to the second side face of the frame. Through the structure, the power battery box has the advantages of low cost and light weight on the basis of meeting the requirements of sealing performance and mechanical performance.

Description

Power battery box

Technical Field

The utility model relates to a power battery technical field especially relates to a power battery box.

Background

In recent years, along with the increasing emphasis on energy conservation and environmental protection, the holding capacity of electric automobiles in China is increasing rapidly. Among them, the battery box is an important component of an electric vehicle, and the safety thereof is very important for the electric vehicle. In the spontaneous combustion accident of the electric automobile, the most part is caused by the defects of the battery box in the aspects of sealing performance and collision resistance, so the sealing performance and the mechanical performance of the battery box are the key points of the safety and light weight design of the electric automobile.

In order to ensure the sealing performance and mechanical property of the battery box and reserve an installation position and a space for installing the power battery, the power battery box is generally made by welding an aluminum plate, an aluminum alloy section and an aluminum alloy casting, and the box body structure is shown in fig. 1. However, the aluminum alloy power battery box has high cost due to the high price of the aluminum alloy. In order to reduce the cost, it is an option to weld with steel stamped parts, and usually, the inner beam 11 'is additionally arranged on the steel bottom plate 1', and the edge beam 21 'and other parts are additionally arranged on the frame 2', but the total weight of the power battery box welded by the steel stamped parts is large, so that the energy density of the battery pack is low, and the design idea of light weight is violated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a power battery box, this power battery box still have with low costs, light in weight's advantage on satisfying the basis that sealing performance and mechanical properties required.

To achieve the purpose, the utility model adopts the following technical proposal:

a power cell box comprising:

the box cover comprises a main body and a connecting part, and the connecting part is arranged at the edge of the main body;

the box body comprises a bottom plate, a frame and sealant, wherein the frame is annular and is internally provided with a cavity, and the head end of the frame is connected with the tail end of the frame in a sealing manner; the frame is provided with a first side face and a second side face which are oppositely arranged, the first side face is connected with the bottom plate in a sealing mode, and the second side face is provided with a plurality of mounting holes at intervals; the sealant is filled in the cavity at the joint of the frames to ensure that the joint is sealed;

the connecting pieces are arranged in the mounting holes and are used for connecting the connecting parts with the second side surfaces of the frames in a sealing mode.

Preferably, the connecting piece comprises a connecting bolt and a rivet nut, a boss is arranged at the head end of the rivet nut, the boss is arranged between the connecting portion and the frame, and the connecting bolt penetrates through the connecting portion and the second side face and is connected with the rivet nut.

Preferably, the box body further comprises a sealing strip, the sealing strip is arranged between the connecting portion and the frame, and the sealing strip is located on one side, close to the inside of the box body, of the boss and limited by the boss.

Preferably, the height of the sealing strip is set to be 2 to 3 times the height of the boss.

Preferably, the frame is integrally formed, and a joint is arranged; or two frames are arranged, and two joints are arranged.

Preferably, the frame is made of a steel plate through roll forming, and the roll forming comprises cold roll forming and hot roll forming.

Preferably, the head end of the frame and the tail end of the frame are connected through welding, and the welding seam is polished to be smooth and free of welding slag.

Preferably, the sealant is made of a thermal expansion material, and can expand to fill the cavity at the joint by baking at a high temperature, so that the sealing performance at the joint is enhanced.

Preferably, the bottom plate is an integrally formed stamping.

Preferably, the bottom plate is provided with a second reinforcing rib.

The utility model has the advantages that:

the utility model provides a power battery box, the inside of the frame of the power battery box is arranged into a cavity structure, the materials used by the frame structure are reduced, the weight of the power battery box is lightened, and the cost of the power battery box is reduced; this power battery box still is equipped with sealed glue, and sealed glue is full of in the cavity of the head end of the frame that is connected and tail end, dies the attach fitting of frame head end and tail end stifled, has further strengthened the leakproofness of frame, has guaranteed this power battery box's leakproofness.

Drawings

FIG. 1 is a schematic structural diagram of a power battery box in the prior art;

fig. 2 is a schematic perspective view of a power battery box according to an embodiment of the present invention;

fig. 3 is a top view of a power battery box according to an embodiment of the present invention;

fig. 4 is an exploded view of the power battery box according to the embodiment of the present invention;

fig. 5 is a sectional view at a of fig. 3.

In the figure:

1', a bottom plate; 11', an inner beam; 2', a frame; 21', edge beams;

1. a box cover; 11. a main body; 12. a connecting portion; 13. a first reinforcing rib; 2. a box body; 21. a base plate; 211. a second reinforcing rib; 22. a frame; 221. a first side surface; 222. a second side surface; 2221. mounting holes; 23. sealing glue; 24. a cavity; 3. a connecting member; 31. a connecting bolt; 32. pulling and riveting the nut; 321. a boss; 4. a sealing strip.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The utility model provides a power battery box for hold and install power battery, as shown in fig. 2, this power battery box includes case lid 1, box 2 and connecting piece 3, and case lid 1 passes through 3 sealing connection of connecting piece on box 2. Preferably, the power battery box further comprises a sealing strip 4, wherein the sealing strip 4 is installed between the box cover 1 and the box body 2, one side of the sealing strip 4 abuts against the box cover 1 under the action of the connecting piece 3, and the other side abuts against the box body 2, so that the box cover 1 and the box body 2 can be connected in a sealing mode. The power battery box is made of steel, and the box cover 1 is hermetically connected with the box body 2, so that the requirements of the power battery box on the sealing performance and the mechanical performance can be met, and the power battery box also has the advantage of low cost.

As shown in fig. 3, in the present embodiment, the box cover 1 includes a main body 11 and a connecting portion 12, the connecting portion 12 is disposed at an edge of the main body 11, wherein the connecting portion 12 is a flanging structure extending outward at the edge of the main body 11. Preferably, the box cover 1 is integrally molded by composite materials, and is convenient to process and light in weight. More preferably, the case cover 1 is provided with first reinforcing ribs 13, which can enhance the strength and rigidity of the case cover 1.

As shown in fig. 4, the case 2 preferably includes a bottom plate 21, a frame 22, and a sealant 23. The frame 22 is of a hollow structure, the cavity 24 is formed in the frame 22, and any cross section of the frame 22 is an annular sealing cross section with the cavity 24, so that the sealing performance of the frame 22 can be guaranteed, materials can be saved, the cost is reduced, and the weight of the frame 22 is reduced. Preferably, the cross-sectional shape of the frame 22 is rectangular to facilitate the manufacturing of the frame 22, and it is understood that the cross-sectional shape of the frame 22 may be other shapes. The frame 22 is integrally formed by a steel plate through a roll forming process, and is bent at a corner by post-processing on a roll line or off the roll line, wherein cold forming processing and hot forming processing can be performed, and those skilled in the art can select the bending according to actual conditions. It should be noted that the number of the frames 22 may be one or two, and those skilled in the art can select the frames according to actual situations. In this embodiment, the frame 22 is provided with a first side surface 221 and a second side surface 222 which are oppositely arranged, the second side surface 222 is provided with a plurality of mounting holes 2221 at intervals, the first side surface 221 is connected to the bottom plate 21 in a sealing manner, and the second side surface 222 is connected to the connecting portion 12 in a sealing manner through the connecting member 3. Preferably, the first side 221 is connected to the bottom plate 21 by laser welding or arc welding, so that the material at the connection position of the frame 22 and the bottom plate 21 can be integrated, and the sealing performance of the connection of the frame 22 and the bottom plate 21 can be enhanced.

In the embodiment, the bottom plate 21 is integrally formed through a stamping process, so that the processing is convenient and the manufacturing cost is low. Preferably, the second reinforcing rib 211 is arranged on the bottom plate 21, and the second reinforcing rib 211 is formed by stamping, so that the strength and rigidity of the bottom plate 21 can be improved and the mechanical property of the bottom plate 21 can be improved on the basis of not increasing materials and keeping the original cost and weight.

In this embodiment, the sealant 23 fills the cavity 24 at the head end of the frame 22 and the cavity 24 at the tail end of the frame 22, and the head end of the frame 22 and the tail end of the frame 22 are sealingly connected, so that the frame 22 forms a ring. It is worth to be noted that, if there is only one frame 22, the head end of the frame 22 is connected with the tail end of the frame in a sealing manner to form a ring; if there are two frames 22, the two frames 22 are sequentially connected end to end, that is, the head end of the first frame 22 is connected to the tail end of the second frame 22, and the tail end of the first frame 22 is connected to the head end of the second frame 22 to form an annular shape.

Preferably, the sealant 23 is made of a thermally expandable raw material that expands by heat, and is capable of expanding by heat. Before the head end of frame 22 and the tail end of frame 22 are connected, scribble sealed glue 23 in the cavity 24 of the head end of frame 22 and the cavity 24 of frame 22 tail end, then with the head end of frame 22 and the tail end sealing connection of frame 22, later when the painting workshop application that has a high temperature in follow-up process, the thermal energy raw and other materials can expand, with the attach fitting stifled of frame 22 head end and tail end, can further strengthen the leakproofness that frame 22 connects the department, guaranteed this power battery box's leakproofness. More preferably, the head end of the frame 22 and the tail end of the frame 22 are connected by laser welding or arc welding, and the materials at the joint of the head end and the tail end of the frame 22 can be integrated, so as to enhance the sealing performance of the connection of the head end and the tail end of the frame 22. In this embodiment, the welding track is polished after the head end and the tail end of the frame 22 are welded, so that the surface through which the sealing strip 4 passes is smooth and has no welding slag, which is beneficial to ensuring the sealing effect of the sealing strip 4.

In this embodiment, the connection member 3 is disposed on the mounting hole 2221 of the second side surface 222 and arranged along the length direction of the frame 22. Preferably, the connecting members 3 are uniformly spaced along the length of the rim 22, so that the force applied between the connecting portion 12 and the rim 22 is uniform, which facilitates the sealing between the connecting portion 12 and the rim 22. As shown in fig. 5, the connecting member 3 includes a connecting bolt 31 and a blind rivet nut 32, the connecting bolt 31 passes through the mounting hole 2221 of the connecting portion 12 and the second side surface 222 and is connected to the blind rivet nut 32, a boss 321 is disposed at the head end of the blind rivet nut 32, and the boss 321 is disposed between the connecting portion 12 and the frame 22. Preferably, the sealing strip 4 is disposed between the connecting portion 12 and the frame 22 and disposed on one side of the rivet nut 32 near the inside of the box body 2, so that the boss 321 can limit the sealing strip 4, which not only facilitates the installation of the sealing strip 4, but also prevents the sealing strip 4 from being dislocated to affect the sealing between the connecting portion 12 and the frame 22. In this embodiment, the sealing strip 4 may be made of foamed or solid rubber material, and those skilled in the art can select the material according to the actual situation. Preferably, the height of the sealing strip 4 is set to be 2 times to 3 times of the height of the boss 321, and the sealing strip 4 can be pressed on the frame 22 by the connecting portion 12, which is beneficial to improving the sealing performance of the connection between the connecting portion 12 and the frame 22.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A power battery box, characterized by comprising:

the box cover (1) comprises a main body (11) and a connecting part (12), wherein the connecting part (12) is arranged at the edge of the main body (11);

the box body (2) comprises a bottom plate (21), a frame (22) and a sealant (23), wherein the frame (22) is annular and is internally provided with a cavity (24), and the head end of the frame (22) is hermetically connected with the tail end of the frame (22); a first side surface (221) and a second side surface (222) which are oppositely arranged are arranged on the frame (22), the first side surface (221) is connected with the bottom plate (21) in a sealing mode, and a plurality of mounting holes (2221) are formed in the second side surface (222) at intervals; the sealing glue (23) is filled in the cavity (24) at the joint of the frame (22) to ensure that the joint is sealed;

the connecting piece (3) is provided with a plurality of connecting pieces (3), the connecting pieces (3) are arranged in the mounting holes (2221), and the connecting pieces (3) are used for connecting the connecting parts (12) to the second side surface (222) of the frame (22) in a sealing mode.

2. The power battery box according to claim 1, characterized in that the connecting piece (3) comprises a connecting bolt (31) and a rivet nut (32), a boss (321) is arranged at the head end of the rivet nut (32), the boss (321) is arranged between the connecting part (12) and the frame (22), and the connecting bolt (31) penetrates through the connecting part (12) and the second side surface (222) and is connected with the rivet nut (32).

3. The power battery box of claim 2, characterized by further comprising a sealing strip (4), wherein the sealing strip (4) is arranged between the connecting portion (12) and the frame (22), and the sealing strip (4) is located on one side of the rivet nut (32) close to the interior of the box body (2) and is limited by the boss (321).

4. A power cell box according to claim 3, wherein the height of the sealing strip (4) is set to be 2-3 times the height of the boss (321).

5. The power battery box according to any one of claims 1-4, characterized in that the frame (22) is formed integrally with a joint; or the number of the frames (22) is two, and two joints are arranged.

6. The power battery box according to any one of claims 1-4, characterized in that the frame (22) is made of steel plate by roll forming, including cold roll forming and hot roll forming.

7. The power battery box according to any one of claims 1-4, characterized in that the head end of the frame (22) and the tail end of the frame (22) are connected by welding, and the welding seam is polished smooth and free of welding slag.

8. The power battery box according to any one of claims 1-4, characterized in that the sealant (23) is made of a thermal expansion material, and can expand to fill the cavity (24) at the joint by baking at high temperature, so as to enhance the sealing performance at the joint.

9. A power cell box according to any one of claims 1-4, characterised in that the bottom plate (21) is an integrally formed stamping.

10. The power battery box according to any one of claims 1-4, characterized in that the bottom plate (21) is provided with a second reinforcing rib (211).