Hot press forming die for four-edge-pressing packaged battery cell partition plate

Abstract

The utility model discloses a hot press forming die for a four-edge-pressing packaged battery cell partition plate, and belongs to the technical field of battery cell partition plate processing. Comprising an upper die plate, a lower die plate, a middle die plate and a material placing jig, and the top and the bottom of the upper die plate and the bottom of the lower die plate are connected with hot pressing equipment; a limiting groove is formed in the top of the lower die plate, the middle die plate is detachably installed in the limiting groove, a limiting frame is arranged on the material placing jig, and the material placing jig is detachably installed on the middle die plate. According to the technical scheme, the structure and the combination mode of the hot-press forming die are improved, the hot-press forming process is improved, the labor intensity of workers is relieved, the production efficiency is improved, the cost is reduced, and the product quality is improved.

Description

Technical Field

[0001] This application relates to the field of battery cell separator processing technology, and in particular to a hot pressing mold for a four-edge sealed battery cell separator. Background Technology

[0002] Four-sided pressure-sealed cell separators are a core structure used for battery thermal management and thermal runaway protection. Their main functions are heat insulation and protection of the cell, while achieving sealing through a hot-pressing process during packaging. These four-sided pressure-sealed cell separators typically employ special materials and structural designs to meet the requirements for sealing, heat insulation, and flame retardancy of the four sides.

[0003] Most existing four-edge sealed battery cell separators are obtained through hot pressing bonding. The specific process includes: mold preheating → removing and opening the upper template → assembling the bottom film → assembling the material placement fixture → assembling the core material → removing the positioning fixture → assembling the upper film → aligning and covering the template → placing the assembled mold into the hot pressing equipment → hot pressing. The hot pressing mold used in the process is assembled from an upper mold, a lower mold, and a material placement fixture made of 8-10mm thick steel plate. The entire process requires manual assembly of the upper mold, lower mold, and material placement fixture to connect each process step, which is time-consuming, labor-intensive, and has low production efficiency. In addition, the mold is prone to deformation, and the equipment and mold wear quickly, resulting in unstable product quality and increasing production costs.

[0004] This application proposes a technical solution to address the shortcomings of the hot-pressing molding dies used in the molding process of existing four-edge sealed battery cell separators. Utility Model Content

[0005] The purpose of this application is to provide a hot pressing mold for a four-edge sealed battery cell separator, which improves the structure and combination of the hot pressing mold, improves the hot pressing process, reduces the labor intensity of workers, increases production efficiency, reduces costs, and improves product quality.

[0006] This application provides a hot-press forming mold for a four-edge encapsulated battery cell separator, which adopts the following technical solution: it includes an upper template, a lower template, a middle template, and a material placement fixture. The top and bottom of the upper template and the bottom of the lower template are respectively connected to a hot-pressing device. The top of the lower template is provided with a limiting groove, the middle template is detachably installed in the limiting groove, and the material placement fixture is provided with a limiting frame and is detachably installed on the middle template.

[0007] By adopting the above technical solution, the top and bottom of the upper template and the bottom of the lower template are directly fixed to the hot pressing equipment. The hot pressing equipment is used to complete the preheating and opening and closing of the template. Compared with the existing process, the process of manually moving the mold and lifting and covering the upper template is eliminated, which reduces the labor intensity of workers and the safety hazards caused by the handling process.

[0008] Based on the upper template, lower template, and material placement fixture, a middle template structure is added. The first layer of hot melt film is assembled on the middle template with the adhesive side facing up. The material placement fixture is assembled on the middle template, and the aerogel core material is placed in the limiting frame. The material placement fixture is lifted and removed. The second layer of hot melt film is assembled on the middle template with the adhesive side facing down. The raw materials and auxiliary materials are assembled. Then, the middle template is assembled on the lower template. The equipment parameters are adjusted, and the hot pressing equipment is started to press down and drive the upper template, lower template, and middle template to close. The raw materials and auxiliary materials are pressed and bonded in the cavity to obtain the hot-pressed product.

[0009] Throughout the hot pressing process, raw materials are assembled on the middle mold plate rather than the lower mold plate. The shape and size of the product obtained by hot pressing are determined by the cavity between the middle mold plate and the upper mold plate. Multiple specifications of products can be produced quickly by alternating the middle mold plate, which improves production efficiency. When the mold wears out, the middle mold plate can be replaced in time without replacing the lower mold plate, which reduces costs and ensures product quality.

[0010] Optionally, the top and bottom of the upper template are respectively provided with upper screw holes and screw countersunk holes, and are locked with the lifting template of the hot press equipment by means of the upper screw holes and screw countersunk holes; the bottom of the lower template is provided with lower screw holes, and is locked with the inlet and outlet template of the hot press equipment by means of the lower screw holes.

[0011] By adopting the above technical solutions, the upper template is thickened, and upper screw holes and countersunk screw holes are provided at the top and bottom of the upper template. Combined with bolts or studs, it is locked to the lifting template of the hot press equipment, eliminating the need for frequent manual opening and closing of the upper template, saving time and labor. At the same time, the thicker upper template also results in less mold deformation during hot pressing, a longer service life, more stable product quality, and reduced production costs. Similarly, the lower template is thickened, and lower screw holes are provided at the bottom of the lower template. Combined with bolts or studs, it is locked to the inlet and outlet templates of the hot press equipment, eliminating the need for manual assembly and handling of the hot press mold, saving time and labor, and enhancing safety. At the same time, the thicker lower template also results in less mold deformation during hot pressing, enhanced wear resistance, extended mold service life, improved product quality, and reduced production costs.

[0012] Optionally, the cross-section of the limiting groove is U-shaped.

[0013] By adopting the above technical solution, a U-shaped limiting groove with high ends and low middle is set on the top of the lower template. The middle template with the raw materials and auxiliary materials is placed into the limiting groove. After the positioning post is aligned and fitted, the outer edge of the middle template is 2mm away from the groove wall on both sides of the limiting groove for thermal expansion space. The middle template cannot be displaced in the horizontal direction, and at the same time, it does not affect the removal of the middle template after hot pressing.

[0014] Optionally, the bottom of the limiting groove is provided with a positioning post, and the middle template, the upper template and the material handling fixture are respectively provided with a first positioning hole, a second positioning hole and a third positioning hole that are slidably connected to the positioning post.

[0015] By adopting the above technical solution, sliding positioning posts and first positioning holes are set on the limiting groove and the middle template to further constrain the horizontal displacement of the middle template, and also facilitate the middle template to be placed into the limiting groove from top to bottom. In addition, when assembling raw and auxiliary materials using the material handling fixture, the positioning posts, first positioning holes and second positioning holes can be used to align the material handling fixture with the middle template. Specifically, the middle template and the material handling fixture are assembled with the lower template in sequence, and the material handling fixture is aligned with the middle template. Finally, the addition of positioning posts, first positioning holes and second positioning holes makes the sliding connection and alignment of the lower template, middle template and upper template more precise, thereby improving the processing dimensional accuracy of the thermoformed products.

[0016] Optionally, the middle template is provided with at least four positioning pins, and the material handling fixture and the upper template are respectively provided with a first pin hole and a second pin hole that are positioned and engaged with the positioning pins.

[0017] By adopting the above technical solution, the material handling fixture can be directly assembled onto the middle template without the need for positioning pins. This allows the middle template to be removed from the lower template for the assembly of raw materials and auxiliary materials. Furthermore, the second pin hole serves as a clearance hole for the positioning pin during mold closing.

[0018] Optionally, the upper template and the middle template are provided with a first cavity and a second cavity on their opposite surfaces.

[0019] By adopting the above technical solution, the depth and shape of the first cavity and the second cavity are controlled to form different hot press mold cavities, thereby accurately controlling the dimensional accuracy of hot press molded products and producing products of different specifications.

[0020] Optionally, the first cavity and the second cavity may be provided in multiple sets.

[0021] By adopting the above technical solution, the first cavity and the second cavity are provided in multiple sets, which increases the number of cavity openings, allowing multiple products to be produced in the same batch, improving the consistency of product quality, and also greatly improving production efficiency and membrane material utilization.

[0022] Optionally, an exhaust groove is provided on the intermediate template between the second cavities.

[0023] By adopting the above technical solution, the gas generated by materials such as hot melt film or aerogel core material during hot pressing is discharged, preventing bubbles or bulges from forming during the molding process, and improving the density and appearance quality of the product.

[0024] Optionally, the lower template has a connecting hole at its top, and the upper template has a connecting post at its bottom that is positioned and engaged with the connecting hole.

[0025] By adopting the above technical solution, the sliding connection and alignment of the lower and upper templates are made more precise, further improving the dimensional accuracy of hot-pressed products and enhancing product quality.

[0026] Optionally, the middle template is provided with outwardly extending handles on opposite sides.

[0027] By adopting the above technical solution, outwardly extending handles are provided on the left, right, front, and rear sides of the middle template, which facilitates the placement of the middle template into the limiting groove and its removal from the limiting groove.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. This application directly connects the upper and lower templates to the hot pressing equipment, eliminating the need for manual handling of the mold and the process of opening and closing the upper template, significantly reducing the labor intensity of workers. At the same time, it also reduces potential safety hazards during handling, making the entire hot pressing process safer, more time-saving, and less labor-intensive.

[0030] 2. This application adds a middle template structure to the existing upper template, lower template, and material placement fixture. By replacing the middle template, products of various specifications can be produced quickly without replacing the lower template, thus improving production efficiency. Furthermore, the middle template has multiple cavities, increasing the production quantity of products in the same batch and further improving production efficiency and membrane material utilization.

[0031] 3. This application constrains the horizontal displacement of the middle template by setting up a U-shaped limiting groove, positioning posts, and positioning holes, ensuring more precise alignment between the middle template and the upper and lower templates. Simultaneously, the depth and shape of the first and second cavities can precisely control the dimensional accuracy of the thermoformed product, and the venting groove design prevents air bubbles or bulges from forming during the molding process, thereby improving the product's density and appearance quality and ensuring product quality stability. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the first overall structure of a hot-pressing molding die for a four-edge encapsulated battery cell separator;

[0033] Figure 2 This is a schematic diagram of the second overall structure of a thermoforming mold for a four-edge-pressed battery cell separator;

[0034] Figure 3 yes Figure 1 A magnified view of part a.

[0035] Explanation of reference numerals in the attached drawings: 1. Upper template; 11. Connecting post; 12. Upper screw hole; 13. Screw countersunk hole; 14. Second positioning hole; 15. First cavity; 16. Second pin hole; 2. Lower template; 21. Limiting groove; 22. Connecting hole; 23. Lower screw hole; 26. Positioning post; 3. Middle template; 31. First positioning hole; 32. Second cavity; 33. Venting groove; 34. Handle; 35. Positioning pin; 4. Material handling fixture; 41. Limiting frame; 42. Third positioning hole; 43. First pin hole. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail.

[0037] This application discloses a hot pressing mold for a four-edge encapsulated battery cell separator.

[0038] Combination Figure 1 As shown, a hot pressing mold for a four-edge encapsulated battery cell separator includes an upper template 1, a lower template 2, a middle template 3, and a material handling fixture 4. The top of the upper template 1 and the bottom of the lower template 2 are respectively connected to a hot pressing device (the hot pressing device is not shown in the figure).

[0039] As one embodiment of this application, based on the thickening of the upper template 1 and the lower template 2, as follows: Figure 1 , Figure 2 As shown, upper screw holes 12, screw countersunk holes 13, and lower screw holes 23 are respectively provided at the top and bottom of the upper template 1 and the bottom of the lower template 2 to be locked with bolts or studs to the hot press equipment. Specifically, the hot press equipment is equipped with a lifting template that can be opened and closed by pressing down on the upper mold and an inlet and outlet template that can drive the lower mold in and out of the hot press equipment. The upper template 1 and the lower template 2 are fixedly connected to the lifting template and the inlet and outlet template respectively, so that the upper template 1 and the lower template 2 can be preheated with the hot press equipment without moving the mold. The upper template 1 and the lower template 2 can also be opened and closed with the help of the hot press equipment to complete the hot pressing of the product.

[0040] The top of the lower template 2 is provided with a limiting groove 21. Bosses are milled onto the left and right sides of the top of the lower template 2, forming a U-shaped limiting groove 21 between the bosses and the upper surface of the lower template 2. Multiple connecting holes 22 are evenly distributed on the bosses; here, four are provided. Figure 2 As shown, the bottom of the upper template 1 is provided with a connecting post 11 that matches the position of the connecting hole 22, which helps the upper template 1 and the lower template 2 to be aligned during the hot pressing process. This ensures that the lower template 2 and the upper template 1 slide and connect accurately, improving the dimensional accuracy of the hot-pressed product and enhancing the product quality.

[0041] The middle template 3 is detachably installed in the limiting groove 21. When the middle template 3 is placed in the limiting groove 21, its left and right outer edges are 2mm away from the groove wall of the limiting groove 21 for thermal expansion space. The horizontal displacement of the middle template 3 is constrained, and the removal of the middle template after hot pressing is not affected. The material handling fixture 4 is provided with a limiting frame 41 and is detachably installed on the middle template 3. The product component composed of hot melt film and aerogel core material is installed on the middle template 3 with the help of the material handling fixture 4. When the upper template 1 and the lower template 2 are closed, the second cavity 32 in the middle of the middle template 3 and the first cavity 15 on the lower surface of the upper template 1 form a closed cavity. The product component is hot pressed in the cavity to obtain the battery cell separator.

[0042] It is worth mentioning that, such as Figure 1 , Figure 3 As shown, after milling the exhaust groove 33 and the second cavity 32 on the upper surface of the middle template 3, an annular boss is formed around the second cavity 32. When assembling the first and second hot melt films, the annular boss is also covered, and the aerogel core material is placed in the second cavity 32, so that the four sides of the aerogel core material in the battery cell separator obtained after hot pressing are covered by the hot melt film, forming a four-edge sealed battery cell separator.

[0043] like Figure 1 , Figure 2 As shown, a first cavity 15 and a second cavity 32 are provided on the opposite surfaces of the upper template 1 and the middle template 3, and multiple sets of the first cavity 15 and the second cavity 32 are provided. The increased number of cavities allows for the production of multiple products in the same batch, improving the consistency of product quality and greatly increasing production efficiency and membrane material utilization.

[0044] like Figure 3 As shown, an exhaust groove 33 is provided on the middle template 3 between the second cavity 32 to exhaust the gas generated by the hot melt film or aerogel core material during the hot pressing process, so as to prevent the formation of bubbles or bulges during the molding process and improve the density and appearance quality of the product.

[0045] As one embodiment of this application, a positioning post 26 is provided at the bottom of the limiting groove 21. The middle template 3, upper template 1, and material handling fixture 4 are respectively provided with a first positioning hole 31, a second positioning hole 14, and a third positioning hole 42 that are slidably connected to the positioning post 26. The positioning post 26, in conjunction with the first positioning hole 31 and the second positioning hole 14, ensures more precise alignment and sliding connection of the lower template 2, middle template 3, and upper template 1 during the mold closing and opening process of the hot pressing equipment. Based on the structure of the connecting hole 22 and the connecting post 11, this further improves the dimensional accuracy of the hot-pressed product and enhances product quality.

[0046] On the other hand, the positioning post 26, in conjunction with the first positioning hole 31 and the third positioning hole 42, provides a first method for assembling product components on the middle template 3. This includes assembling the middle template 3 onto the lower template 2 using the positioning post 26 and the first positioning hole 31, assembling the first layer of hot melt film on the middle template 3 with the adhesive side facing up, assembling the material placement fixture 4 onto the middle template 3 using the positioning post 26 and the third positioning hole 42, placing the aerogel core material within the limiting frame 41, lifting and removing the material placement fixture 4, assembling the second layer of hot melt film onto the middle template 3 with the adhesive side facing down, and completing the assembly of the raw materials.

[0047] As one embodiment of this application, such as Figure 1 , Figure 2 As shown, the middle template 3 is provided with six locating pins 35, and the material handling fixture 4 and the upper template 1 are respectively provided with six first pin holes 43 and six second pin holes 16 that are positioned and engaged with the locating pins 35. This allows the material handling fixture 4 to be directly assembled onto the middle template 3 without the need for the locating pins 26. This allows the middle template 3 to be removed from the lower template 2 for the assembly of raw and auxiliary materials, resulting in a second method of assembling product components on the middle template 3. Furthermore, the second pin holes 16 serve as clearance holes for the locating pins 35 during mold closing.

[0048] The hot-press forming mold for a four-edge encapsulated battery cell separator disclosed in this application uses an upper template 1 and a lower template 2, which are fastened to a hot-pressing device and preheated. The middle template 3 is then manually assembled to connect the process flow, saving time and labor, increasing production efficiency, and improving safety. The hot-press forming process steps are as follows:

[0049] Step 1: Align the upper template 1 and the lower template 2 in the center, tighten them onto the hot press with screws, and preheat.

[0050] Step 2: Take out the middle template 3 and lay it flat. Assemble the first layer of hot melt film on the middle template 3 with the adhesive side facing up.

[0051] Step 3: Assemble the material handling fixture 4 onto the middle template 3 using the positioning pin 35 and the first pin hole 43;

[0052] Step 4: Place the aerogel core material into the limiting frame 41 of the placement fixture 4;

[0053] Step 5: Press down on the aerogel core material, lift it flat and remove the placement fixture 4;

[0054] Step 6: Assemble the second layer of hot melt film on the middle template 3, with the adhesive side facing down;

[0055] Step 7: Hold handle 34 and align the first positioning hole 31 of the assembled middle template 3 with the positioning post 26 of the lower template 2 and place it into the limiting groove 21;

[0056] Step 8: Adjust the equipment parameters, press the button to start the hot press to begin pressing and molding, and the processing is complete.

[0057] The upper template 1 and lower template 2 of the hot pressing mold of this application are thickened to 32mm and tightly locked on the hot pressing equipment, eliminating the need for manual handling. The thickness of the middle template 3 is reduced to 6mm steel plate or 8~10mm aluminum plate, increasing the number of cavities in the cavity 5. This improves the existing process flow steps, effectively increases production efficiency, reduces safety hazards, lowers production costs, and improves product quality.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hot-pressing mold for a four-edge sealed battery cell separator, characterized in that: It includes an upper template (1), a lower template (2), a middle template (3), and a material placement fixture (4). The top and bottom of the upper template (1) and the bottom of the lower template (2) are respectively connected to a hot pressing device. The top of the lower template (2) is provided with a limiting groove (21). The middle template (3) is detachably installed in the limiting groove (21). The material placement fixture (4) is provided with a limiting frame (41) and is detachably installed on the middle template (3).

2. The hot pressing forming mold for a four-edge encapsulated battery cell separator according to claim 1, characterized in that: The upper template (1) is provided with an upper screw hole (12) and a screw countersunk hole (13) at its top and bottom, respectively, and is locked with the lifting template of the hot press equipment by means of the upper screw hole (12) and the screw countersunk hole (13); the lower template (2) is provided with a lower screw hole (23) at its bottom, and is locked with the inlet and outlet template of the hot press equipment by means of the lower screw hole (23).

3. The hot pressing forming mold for a four-edge encapsulated battery cell separator according to claim 1, characterized in that: The limiting groove (21) has a concave cross-section.

4. The hot pressing forming mold for a four-edge encapsulated battery cell separator according to claim 3, characterized in that: The bottom of the limiting groove (21) is provided with a positioning post (26), and the middle template (3), the upper template (1) and the material handling fixture (4) are respectively provided with a first positioning hole (31), a second positioning hole (14) and a third positioning hole (42) that are slidably connected to the positioning post (26).

5. The hot pressing forming mold for a four-edge encapsulated battery cell separator according to claim 4, characterized in that: The middle template (3) is provided with at least four positioning pins (35), and the material handling fixture (4) and the upper template (1) are respectively provided with a first pin hole (43) and a second pin hole (16) that cooperate with the positioning pins (35).

6. The hot pressing forming mold for a four-edge encapsulated battery cell separator according to claim 1, characterized in that: The upper template (1) and the middle template (3) are provided with a first cavity (15) and a second cavity (32) on their opposite surfaces.

7. The hot pressing forming mold for a four-edge encapsulated battery cell separator according to claim 6, characterized in that: The first cavity (15) and the second cavity (32) are provided with multiple sets.

8. The hot pressing mold for a four-edge encapsulated battery cell separator according to claim 7, characterized in that: An exhaust groove (33) is provided on the middle template (3) between the second cavity (32).

9. The hot pressing mold for a four-edge encapsulated battery cell separator according to claim 1, characterized in that: The lower template (2) is provided with a connecting hole (22) at the top, and the upper template (1) is provided with a connecting post (11) at the bottom that is positioned and engaged with the connecting hole (22).

10. The hot pressing mold for a four-edge encapsulated battery cell separator according to claim 1, characterized in that: The middle template (3) has outwardly extending handles (34) on its opposite sides.

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