Lightweight battery pack packaging shell

Abstract

The light-weight battery pack packaging shell comprises a box cover and a box base, a battery workpiece is borne on the box base, the box base is of a rectangular flat plate structure made of metal, an opening of the box cover faces downwards and correspondingly covers the box base in a sealing mode, and the battery workpiece is wrapped in the box cover. The box cover is made of plastic, a vertically outward turned edge is arranged on the lower edge of the box cover, a thickening and pressure equalizing mechanism is arranged on the upper surface of the turned edge, the thickening and pressure equalizing mechanism, the turned edge and the box cover are integrally formed parts, the thickening and pressure equalizing mechanism comprises concave parts and convex parts which are arranged at equal intervals along the turned edge, the concave parts are screw fixing seats, screw holes are formed in the centers of the concave parts, and the convex parts are provided with screw holes. The thickness of the concave part is greater than that of the box cover body; a circle of sealing strip is further arranged between the turned-over edge and the box base, the turned-over edge is pressed on the sealing strip, and a screw fixing base on the turned-over edge is connected with the box base in a sealed mode through screws. According to the utility model, the structure of the joint of the box cover is improved, so that the box cover and the box seat can be effectively sealed and connected, and the safety of an internal battery is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy battery carriers, and particularly relates to a lightweight battery pack packaging shell. Background Art

[0002] The packaging structure of new energy batteries is one of the most important components in electric vehicles, and it is a key component responsible for keeping the battery dry, firm and safe. Currently, about 80% of electric vehicles use aluminum or steel battery shells, but using a metal shell makes the entire battery module quite heavy, usually accounting for about 40% of the total vehicle weight, and the manufacturing cost of the metal shell is also very high. In order to lightweight electric vehicles, reduce weight and save costs, the current development trend is to use thermoplastic battery shells to partially replace metal shells. For parts that do not bear the weight of the battery module, such as the upper cover of the battery, it is encapsulated with plastic material, and the base of the battery still uses metal material, which can reduce the weight of the entire battery shell. The detachable connection between the plastic upper cover and the metal base can ensure its recyclability, but during use, a sealed connection must be ensured between the plastic upper cover and the metal base. Since the material of the plastic upper cover is relatively soft, when the plastic upper cover and the metal base are sealed and fixedly connected by multiple screws, the connection is prone to uneven pressure or deformation due to force, resulting in insufficient airtightness of the packaging shell and affecting the safety of automotive batteries. Content of the Utility Model

[0003] In view of the above problems and technical requirements, the utility model provides a lightweight battery pack packaging shell, which uses a plastic material box cover to reduce the overall mass of the shell, improves the structure of the connection part of the box cover, enables an effective sealed connection between the box cover and the box seat, and enhances the safety of the internal battery.

[0004] The technical solution of the utility model is as follows: A lightweight battery pack packaging shell includes a box cover and a box seat. The box seat carries a battery workpiece. The box seat is a rectangular flat plate structure made of metal. The box cover has an opening facing downwards and is hermetically covered on the box seat correspondingly. The box cover wraps the battery workpiece inside. The box cover is made of plastic material. The lower edge of the box cover is provided with a vertically outward flanging. The upper surface of the flanging is provided with a thickening and pressure equalizing mechanism. The thickening and pressure equalizing mechanism and the flanging and the box cover are integrally formed. The thickening and pressure equalizing mechanism includes concave parts and convex parts arranged at equal intervals along the flanging. Among them, the concave part is a screw fixing seat, and a screw hole is provided at the center of the concave part. The thickness of the concave part is greater than the thickness of the box cover body. A sealing strip is also provided between the flanging and the box seat. The flanging is pressed tightly on the sealing strip. The screw fixing seats on the flanging are hermetically connected to the box seat through screws. The plastic box cover and the metal box seat are connected to form a shell structure for accommodating the battery module. The plastic box cover includes the top plate and side plates of the shell. Compared with the metal box cover, the overall mass of this shell structure is greatly reduced, meeting the lightweight requirements of electric vehicles and saving production costs.

[0005] Further, the convex part of the thickening and pressure equalizing mechanism is a flat plate pressure increasing block. The middle part of the flat plate pressure increasing block has a uniform thickness. There are arc-shaped transition surfaces between both sides of the flat plate pressure increasing block and the screw fixing seat, and there is also a transition fillet at the bottom of the arc-shaped transition surface.

[0006] Further, the inside of the flat plate pressure increasing block is of a hollow type. There is a transverse reinforcing rib and multiple longitudinal reinforcing ribs inside the flat plate pressure increasing block. The multiple longitudinal reinforcing ribs and the transverse reinforcing rib penetrate and intersect with each other. The outer side surface of the flat plate pressure increasing block is not closed. The thickness and strength of the flat plate pressure increasing block are increased by the internal reinforcing ribs. When the screw fixing seats on both sides of the flat plate pressure increasing block are locked and pressurized by screws, the flat plate pressure increasing block can maintain synchronous downward pressure and will not arch and deform due to the relatively soft material, achieving the same sealing effect as the metal pressing strip.

[0007] Further, the lower surface of the flanging is flat. The lower surface of the flanging is tightly connected to the sealing strip. There are multiple pressure grooves around the screw holes on the lower surface of the flanging. When the screw passes through the sealing strip and locks with the box seat, the sealing strip squeezed around the screw can be squeezed into the pressure grooves. The pressure grooves also increase the friction between the sealing strip and the lower surface of the flanging, achieving the purpose of fixing the sealing strip and preventing the sealing strip from shifting.

[0008] Further, the initial thickness of the sealing strip is 5 mm. In the state where the box cover and the box seat are tightly connected, the sealing strip is compressed, and the thickness of the compressed sealing strip does not exceed 2.5 mm.

[0009] Further, there are round chamfers between the top plate and the four side plates of the box cover, and there are also round chamfers between adjacent side plates. Round chamfers are provided on the outer side edges of the box cover, so that there are no sharp corners on the outer wall of the box cover, which can reduce damage caused by collision and friction during use.

[0010] Further, the box cover is made of polypropylene.

[0011] Further, the screw is a stainless steel cylinder head socket head cap screw. Since the area of the screw fixing seat is very small, it is easier to lock and operate by using the cylinder head socket head cap screw connection.

[0012] Advantages of the present utility model: 1) The box cover made of plastic material is hermetically connected to the metal box seat to form a housing for accommodating the battery module. The flat metal box seat bears the weight of the battery. The surface area of the plastic box cover is larger than that of the metal box seat. Therefore, the weight of this sealing structure is greatly reduced compared to the all-metal housing, meeting the requirement of vehicle body lightweight. Since the box cover itself does not bear the weight of the battery, even if the strength of the plastic box cover is less than that of the metal box seat, it is still suitable for the storage and protection of the battery module. 2) Concave and convex screw fixing seats and flat plate pressure increasing blocks are arranged on the flanging of the box cover, thickening the overall thickness of the flanging. The thickened screw fixing seat can bear the pressing force of the screw, and the flat plate pressure increasing block can ensure that it does not arch upward under the pressing action of the screws on both sides. The crisscrossing reinforcing ribs in the flat plate pressure increasing block ensure that the flat plate pressure increasing block also has sufficient strength, enabling the flat plate pressure increasing block to evenly press on the sealing strip. The flanging structure of the box cover is not easily deformed, and the sealing effect between the box cover and the box seat is better. Description of the Drawings

[0013] Figure 1 is an assembly structure diagram of the lightweight battery pack encapsulation housing of the present utility model;

[0014] Figure 2 is a partial enlarged view of the connection structure between the flanging of the box cover and the box seat in the present utility model;

[0015] Figure 3 is a partial enlarged view of the lower surface structure of the flanging in the present utility model;

[0016] In the figure, the markings are: box cover 1, round chamfer 11, flanging 2, pressure increasing groove 21, thickening and pressure equalizing mechanism 3, screw fixing seat 31, screw hole 311, flat plate pressure increasing block 32, arc transition surface 321, transition fillet 322, transverse reinforcing rib 323, longitudinal reinforcing rib 324, sealing strip 4, screw 5, box seat 6. Detailed Embodiment

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] As Figures 1-3 shown, the lightweight battery pack encapsulation housing of the present utility model includes a box cover 1 and a box seat 6. The battery workpiece is carried on the box seat 6. The box seat 6 is a rectangular flat plate structure made of metal. The box cover 1 has an opening facing downward and is hermetically covered on the box seat 6. The box cover 1 wraps the battery workpiece inside. The box cover 1 is made of plastic material. The lower edge of the box cover 1 is provided with a vertically outward flanging 2. The upper surface of the flanging 2 is provided with a thickening and pressure equalizing mechanism 3. The thickening and pressure equalizing mechanism 3 and the flanging 21 and the box cover are integrally formed parts.

[0019] The thickening and pressure equalizing mechanism 3 includes recesses and protrusions arranged at equal intervals along the flanging 2. Among them, the recess is a screw fixing seat 31, a screw hole 311 is provided at the center of the recess, and the thickness of the recess is greater than the thickness of the box cover body; the protrusion of the thickening and pressure equalizing mechanism 3 is a flat plate pressure increasing block 32, the middle part of the flat plate pressure increasing block 32 has a uniform thickness, and an arc transition surface 321 is provided between both sides of the flat plate pressure increasing block 32 and the screw fixing seat 31, and a transition fillet 322 is also provided at the bottom of the arc transition surface 321. The inside of the flat plate pressure increasing block 32 is of a hollow type, a transverse reinforcing rib 323 and a plurality of longitudinal reinforcing ribs 324 are provided inside the flat plate pressure increasing block 32, the plurality of longitudinal reinforcing ribs 324 and the transverse reinforcing rib 323 penetrate and intersect with each other, and the outer side surface of the flat plate pressure increasing block 32 is not closed.

[0020] A sealing strip 4 is also provided between the flanging 2 and the box seat 6, the flanging 2 is pressed against the sealing strip 4, and the screw fixing seat 31 on the flanging 2 is hermetically connected to the box seat 6 through a screw 5. The initial thickness of the sealing strip 4 is 5 mm. In the state where the box cover 1 and the box seat 6 are tightly connected, the sealing strip 4 is compressed, and the thickness of the sealing strip 4 after compression does not exceed 2.5 mm.

[0021] The box cover 1 is specifically made of polypropylene material, and round chamfers 11 are provided between the top plate and the four side plates of the box cover 1, and round chamfers 11 are also provided between adjacent side plates. Round chamfers are provided on the outer side edges of the box cover, so that there are no sharp corners on the outer wall of the box cover, and damage caused by collision and friction can be reduced during use.

[0022] The lower surface of the flanging 2 is flat, the lower surface of the flanging 2 is tightly connected to the sealing strip 4, and a plurality of pressure grooves 21 are provided around the screw hole 311 on the lower surface of the flanging 2. When the screw 5 passes through the sealing strip 4 and is locked with the box seat 6, the sealing strip 4 squeezed around the screw 5 can be squeezed into the pressure grooves 21, and the pressure grooves 21 also increase the friction between the sealing strip 4 and the lower surface of the flanging, achieving the purpose of fixing the sealing strip and preventing the sealing strip 4 from shifting. The screw 5 is a stainless steel cylinder head socket head cap screw. Since the area of the screw fixing seat 31 is very small, it is easier to lock and operate by using a cylinder head socket head cap screw connection.

[0023] The above are only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A lightweight battery pack packaging shell, characterized in that: It includes a box cover and a box seat, the box seat carries the battery workpiece, the box seat is a rectangular flat structure made of metal, the box cover opening faces downward and the corresponding sealing cover is closed on the box seat, and the box cover covers the battery workpiece inside; the box cover is made of plastic material, the lower edge of the box cover is provided with a vertical outward flange, the upper surface of the flange is provided with a thickening and equalizing pressure mechanism, the thickening and equalizing pressure mechanism, the flange and the box cover are an integrally formed part, the thickening and equalizing pressure mechanism includes recesses and protrusions arranged at equal distances along the flange, wherein the recess is a screw fixing seat, the center of the recess is provided with a screw hole, and the thickness of the recess is greater than the thickness of the box cover body; a circle of sealing strip is also provided between the flange and the box seat, the flange is pressed tightly on the sealing strip, and the screw fixing seat on the flange is sealed and connected to the box seat by screws.

2. The lightweight battery pack packaging shell according to claim 1, characterized in that: The convex part of the thickened pressure equalizing mechanism is a flat plate boosting block, the middle part of the flat plate boosting block has a uniform thickness, arc-shaped transition surfaces are provided between the two sides of the flat plate boosting block and the screw fixing seat, and the bottom of the arc-shaped transition surface is also provided with a transition fillet.

3. A lightweight battery pack packaging shell according to claim 2, characterized in that: The interior of the flat-plate boost block is hollow, and a transverse reinforcing rib and a plurality of longitudinal reinforcing ribs are arranged inside the flat-plate boost block. The plurality of longitudinal reinforcing ribs and the transverse reinforcing ribs penetrate each other and are arranged in an interlaced manner, and the outer side surface of the flat-plate boost block is not closed.

4. The lightweight battery pack packaging shell according to claim 3, characterized in that: The lower surface of the flange is plane-shaped, the lower surface of the flange is tightly connected with the sealing strip, and a plurality of pressurizing grooves are arranged around the screw holes on the lower surface of the flange.

5. The lightweight battery pack packaging shell according to claim 4, characterized in that: The initial thickness of the sealing strip is 5 mm. When the box cover and the box seat are tightly connected, the sealing strip is compressed, and the thickness of the compressed sealing strip does not exceed 2.5 mm.

6. The lightweight battery pack packaging shell according to claim 5, characterized in that: Round chamfers are arranged between the top plate and the four side plates of the box cover, and round chamfers are also arranged between adjacent side plates.

7. The lightweight battery pack packaging shell according to claim 6, characterized in that: The box cover is made of polypropylene.

8. The lightweight battery pack packaging shell according to claim 7, characterized in that: The screw is a cylindrical head hexagon socket screw made of stainless steel.

Images