A battery pack front shell die-casting mold

Abstract

The utility model relates to die casting mould technical field, concretely relates to a battery package front casing die casting mould for making metal liquid into front casing body, including the fixed mould component of installing in the injection end of die casting machine, the movable mould component of installing in the movable end of die casting machine and the core component of setting between fixed mould component and movable mould component, the fixed mould component includes the fixed mould plate of installing in the injection end on die casting machine, and the inside fixed cavity plate of fixed mould plate, the movable mould component includes movable mould plate, the core component includes the core plate of installing on movable mould plate, and the core body of being able to be shaped into the front casing body is provided on the core plate, the core component still includes reciprocating forming block, the utility model discloses through the optimization core and cavity can effectively solve the filling difficulty, the air entrapment, the shrinkage cavity, the deformation etc. of large -scale thin -walled casing die casting process, thereby significantly improve the inherent quality, the dimensional accuracy and production efficiency of casting.

Description

Technical Field

[0001] This utility model relates to the field of die-casting mold technology, specifically to a die-casting mold for the front shell of a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the performance, safety, and lightweight requirements of power batteries, as their core components, are increasingly stringent. The battery pack is the unit that carries and protects the power battery. Its casing, especially the front casing located at the front of the vehicle, not only needs to provide robust physical protection for the internal cells, modules, and management system, but also often integrates complex cooling channels, anti-collision structures, mounting points, and interfaces for connection with the vehicle body. Therefore, the structural integrity, sealing, lightweighting, and production efficiency of the battery pack's front casing directly affect the overall vehicle's safety performance and manufacturing cost.

[0003] Currently, the main manufacturing processes for the front casing of battery packs include stamping and welding, profile welding, and die casting. Among these, high-pressure die casting is gradually becoming the mainstream technology for manufacturing large battery pack casings due to its ability to form complex shapes, high structural integration, and excellent dimensional accuracy thin-walled parts in a single process, while achieving extremely high production efficiency. The front casing of a battery pack typically features a large projected area, thin walls, and numerous deep cavities and narrow slits. During the die casting process, when molten metal (such as aluminum alloy) fills the cavity at high speed, defects such as air entrapment, turbulence, and incomplete filling are easily generated. Especially for the crisscrossing reinforcing ribs and cooling channels inside the casing, the traditional mold gating and venting systems are difficult to design to ensure that the molten metal fills the entire cavity smoothly and sequentially, leading to porosity and shrinkage within the casting, severely affecting the airtightness and mechanical properties of the casing. Utility Model Content

[0004] The purpose of this invention is to provide a die-casting mold for the front shell of a battery pack. By optimizing the core and cavity, it can effectively solve problems such as filling difficulties, air entrapment, shrinkage cavities, and deformation in the die-casting process of large thin-walled shells, thereby significantly improving the internal quality, dimensional accuracy, and production efficiency of the castings.

[0005] To address the problems of existing technologies, this utility model provides a die-casting mold for a battery pack front shell, used to form a front shell body from molten metal. The mold includes a fixed mold assembly installed at the injection end of a die-casting machine, a moving mold assembly installed at the movable end of the die-casting machine, and a core assembly disposed between the fixed mold assembly and the moving mold assembly. The fixed mold assembly includes a fixed template installed at the injection end of the die-casting machine, and a cavity plate is fixed inside the fixed template. The moving mold assembly includes a moving template. The core assembly includes a core plate installed on the moving template, and a core body capable of being formed into the front shell body is disposed on the core plate. The core assembly also includes a reciprocating forming block. A cavity for forming the front shell body is formed between the cavity plate, the core body, and the forming block.

[0006] Preferably, the fixed mold plate is provided with a gate that can be connected to the injection port of the die casting machine, and the moving mold plate is provided with a guide corresponding to the gate, and the guide has a flow channel. When the fixed mold assembly and the moving mold assembly are closed, the guide is inserted into the gate and guides the molten metal into the cavity.

[0007] Preferably, the template further includes a cooling component for cooling the molten metal.

[0008] Preferably, the core assembly further includes a bracket fixed on the moving template, and a telescopic drive component is fixed on the outside of the bracket, and the output end of the telescopic drive component is connected to the molding block.

[0009] Preferably, the four corners of the top of the moving mold plate are vertically provided with positioning rods, and the four corners of the bottom of the fixed mold plate are provided with positioning holes. When the fixed mold assembly and the moving mold assembly are closed, the positioning rods can be inserted into the positioning holes.

[0010] Preferably, the bottom of the moving template has fixed seats on both sides, and the two fixed seats have push plates that can move up and down. Several push rods are vertically distributed on the push plates, and the push rods pass through the moving template and extend into the cavity.

[0011] Preferably, the bottom of the moving template also has a guide block for keeping the push plate moving in a straight line.

[0012] The advantages of this utility model compared to the prior art are: This application adopts a modular mold structure design. A cavity plate is assembled at the bottom of the fixed mold plate, and a core plate is integrated inside the moving mold plate. A core body is integrally formed on the core plate, and a forming block that can reciprocate along a preset trajectory is embedded inside the core plate. The core body serves as the forming reference for the main structure of the front shell body, and the forming block adapts to the integrated forming requirements of complex features such as sealing grooves and mounting interfaces on the front shell body. The three components work together to form a complete cavity for processing the front shell body, ensuring that the cavity contour matches the product design dimensions. When the mold enters the mold closing process, the guide on the core plate and the gate of the fixed mold plate are inserted into each other to form a closed filling channel, effectively preventing molten metal leakage and gas entrapment during die casting. The die casting machine forces molten metal into the gate at a set pressure and flow rate. Under the guidance of the guide, the molten metal smoothly enters the cavity along the preset flow channel, completing the filling through the forming space formed by the cavity plate, core body, and forming block. This structural design, through optimized flow channels in the guide components and a sealed cavity design, significantly improves the stability of molten metal filling, ensuring uniform and synchronized solidification within the cavity. This effectively suppresses internal defects such as porosity and shrinkage, and greatly reduces the risk of warping deformation caused by uneven solidification shrinkage. The final formed front shell not only meets the required density, but its critical dimensional tolerances are also controlled within the design tolerance range, demonstrating excellent dimensional stability and directly meeting the precision requirements of subsequent assembly processes. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a die-casting mold for the front shell of a battery pack according to this utility model.

[0014] Figure 2 This is a first exploded structural diagram of a die-casting mold for the front shell of a battery pack according to this utility model.

[0015] Figure 3 This is a second exploded structural diagram of a die-casting mold for the front shell of a battery pack according to this utility model.

[0016] Figure 4 This is a schematic diagram of the fixed mold assembly and the three-dimensional structure of the front shell die-casting mold of a battery pack according to the present invention.

[0017] Figure 5 This is a three-dimensional structural diagram of the core component of a die-casting mold for the front shell of a battery pack according to this utility model.

[0018] Figure 6 This is a three-dimensional structural diagram of the moving mold assembly of a die-casting mold for the front shell of a battery pack according to this utility model.

[0019] Figure 7 This is a three-dimensional structural diagram of the front shell body of a die-casting mold for the front shell of a battery pack according to this utility model.

[0020] The numbers in the diagram are as follows: 1. Fixed mold assembly; 11. Fixed mold plate; 111. Gate; 112. Cooling assembly; 113. Cavity plate; 114. Positioning hole; 2. Moving mold assembly; 21. Moving mold plate; 211. Positioning rod; 22. Fixed base; 23. Guide block; 24. Ejector plate; 241. Ejector rod; 3. Core assembly; 31. Core plate; 311. Core body; 312. Guide component; 313. Telescopic drive component; 314. Molding block; 315. Support; 4. Front shell body. Detailed Implementation

[0021] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0022] Reference Figures 1-7 As shown, this utility model provides a die-casting mold for the front shell of a battery pack, used to form the front shell body 4 from molten metal. It includes a fixed mold assembly 1 installed at the injection end of a die-casting machine, a moving mold assembly 2 installed at the moving end of the die-casting machine, and a core assembly 3 disposed between the fixed mold assembly 1 and the moving mold assembly 2. The fixed mold assembly 1 includes a fixed template 11 installed at the injection end of the die-casting machine, and a cavity plate 113 is fixed inside the fixed template 11. The moving mold assembly 2 includes a moving template 21. The core assembly 3 includes a core plate 31 installed on the moving template 21, and a core body 311 capable of being formed into the front shell body 4 is provided on the core plate 31. The core assembly 3 also includes a reciprocating forming block 314. A cavity for forming the front shell body 4 is formed between the cavity plate 113, the core body 311, and the forming block 314. The core assembly 3 also includes a bracket 315 fixed on the moving template 21, and a telescopic drive member 313 is fixed on the outside of the bracket 315, and the output end of the telescopic drive member 313 is connected to the molding block 314.

[0023] The telescopic drive component 313 is activated, driving the forming block 314 to move along a preset trajectory to the forming station, so that the forming block 314 fits into the corresponding position of the core body 311. At this time, the cavity plate 113, the core body 311, and the forming block 314 together form a complete and sealed cavity. The moving end of the die-casting machine drives the moving mold assembly 2 and the core assembly 3 installed on it to move towards the fixed mold assembly 1 until the fixed mold plate 11 fits into the moving mold plate 21, completing the mold closing action. At this time, the mold is in a sealed and locked state, and the conditions for molten metal filling are met. The die-casting machine injects molten metal into the mold at a preset pressure and flow rate through the injection end. The molten metal enters the cavity along the injection channel and fully fills the sealed cavity, completely covering the forming surfaces of the core body 311 and the forming block 314. The molten metal exchanges heat with the cavity plate 113, the core body 311, and the forming block 314 in the cavity, gradually cooling and solidifying, finally forming the front shell body 4 that conforms to the contour of the cavity. After the front shell body 4 has completely solidified, the moving end of the die-casting machine drives the moving mold assembly 2 and the core assembly 3 to move away from the fixed mold assembly 1, completing the mold opening action; then the telescopic drive component 313 starts in reverse, driving the molding block 314 to retreat along the demolding trajectory, detaching from the complex local features on the front shell body 4, and releasing the constraint of the molding block 314 on the front shell body 4; finally, the front shell body 4 is ejected from the core body 311 by the mold ejection mechanism (the component is not mentioned and is supplemented according to the working logic), completing the entire molding process, and the mold is reset to enter the next production cycle.

[0024] The fixed mold plate 11 is provided with a gate 111 that can connect with the injection port of the die-casting machine. The moving mold plate 21 is provided with a guide 312 corresponding to the gate 111, and the guide 312 has a runner. When the fixed mold assembly 1 and the moving mold assembly 2 are closed, the guide 312 is inserted into the gate 111 and guides the molten metal into the cavity. The fixed mold plate 11 also has a cooling assembly 112 for cooling the molten metal.

[0025] The guide 312 is equipped with a runner. The inlet end of the runner is adapted to the outlet profile of the gate 111, and the outlet end of the runner faces the preset feeding area of ​​the cavity. The inner wall of the runner is polished to reduce the resistance to the flow of molten metal. The guide 312 has dual functions of positioning and guiding, and flow guiding: it can be inserted into the gate 111 in the mold closed state, and form an integrated closed conveying channel after the mold is closed; through the design of the internal runner, the molten metal is guided into the cavity according to the preset path and flow rate.

[0026] Positioning rods 211 are vertically installed at the four corners of the top of the moving mold plate 21, and positioning holes 114 are opened at the four corners of the bottom of the fixed mold plate 11. When the fixed mold assembly 1 and the moving mold assembly 2 are closed, the positioning rods 211 can be inserted into the positioning holes 114. The positioning rods 211 are made of high-strength wear-resistant alloy material and are integrally formed or fixedly assembled at the four corners of the top of the moving mold plate 21 in the vertical direction. The positioning rods 211 at the four corners of the moving mold plate 21 and the corresponding positioning holes 114 of the fixed mold plate 11 form a distributed guiding and positioning system. The four-point positioning principle is used to achieve high-precision coaxial alignment between the fixed mold assembly 1 and the moving mold assembly 2, so that the uniformity of the gap of the cavity after mold closing is controlled within the design allowable range.

[0027] The movable template 21 has fixed seats 22 on both sides of its bottom, and each fixed seat 22 has a push plate 24 that can move up and down. Several push rods 241 are vertically distributed on the push plate 24, and the push rods 241 pass through the movable template 21 and extend into the cavity. The bottom of the movable template 21 also has a guide block 23 for keeping the push plate 24 moving in a straight line.

[0028] The ejection mechanism of the die casting machine provides driving force, which pushes the push plate 24 in the fixed seats 22 on both sides of the bottom of the moving template 21 to move vertically upward along the guide groove of the guide block 23. The push plate 24 simultaneously drives the push rods 241 distributed in a matrix on it to push upward. The front shell body 4 is smoothly pushed away from the surface of the core body 311 by the evenly distributed ejection force, thus completing the demolding.

[0029] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A die-casting mold for a battery pack front housing, used to form a front housing body (4) from molten metal, characterized in that: The assembly includes a fixed mold assembly (1) installed at the injection end of the die casting machine, a moving mold assembly (2) installed at the moving end of the die casting machine, and a core assembly (3) disposed between the fixed mold assembly (1) and the moving mold assembly (2). The fixed mold assembly (1) includes a fixed template (11) installed at the injection end of the die casting machine, and a cavity plate (113) is fixed inside the fixed template (11). The moving mold assembly (2) includes a moving template (21). The core assembly (3) includes a core plate (31) installed on the moving template (21), and a core body (311) capable of being formed into a front shell body (4) is provided on the core plate (31). The core assembly (3) also includes a reciprocating forming block (314). A cavity for forming the front shell body (4) is formed between the cavity plate (113), the core body (311), and the forming block (314).

2. The die-casting mold for the front housing of a battery pack according to claim 1, characterized in that: The fixed mold plate (11) is provided with a gate (111) that can be connected to the injection port of the die casting machine. The moving mold plate (21) is provided with a guide (312) corresponding to the gate (111), and the guide (312) has a flow channel. When the fixed mold assembly (1) and the moving mold assembly (2) are closed, the guide (312) is inserted into the gate (111) and guides the molten metal into the cavity.

3. The die-casting mold for the front housing of a battery pack according to claim 2, characterized in that: The template (11) also has a cooling assembly (112) for cooling the molten metal.

4. The die-casting mold for the front housing of a battery pack according to claim 1, characterized in that: The core assembly (3) also includes a bracket (315) fixed on the moving template (21), and a telescopic drive (313) is fixed on the outside of the bracket (315), and the output end of the telescopic drive (313) is connected to the molding block (314).

5. The die-casting mold for the front housing of a battery pack according to claim 1, characterized in that: The four corners of the top of the moving template (21) are also vertically provided with positioning rods (211), and the four corners of the bottom of the fixed template (11) are also provided with positioning holes (114). When the fixed mold assembly (1) and the moving mold assembly (2) are closed, the positioning rods (211) can be inserted into the positioning holes (114).

6. The die-casting mold for the front housing of a battery pack according to claim 5, characterized in that: The bottom of the moving template (21) has fixed seats (22) on both sides, and the two fixed seats (22) have push plates (24) that can move up and down. Several push rods (241) are vertically distributed on the push plate (24), and the push rods (241) pass through the moving template (21) and extend into the cavity.

7. A die-casting mold for the front housing of a battery pack according to claim 6, characterized in that: The bottom of the moving template (21) also has a guide block (23) for keeping the push plate (24) moving in a straight line.

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