One-mold multi-cavity injection mold for battery insulation ring production

Abstract

The utility model discloses a one-mold multi-cavity injection mold for producing a battery insulation ring. The one-mold multi-cavity injection mold comprises an upper mold assembly and a lower mold assembly, the upper die assembly sequentially comprises an upper die fixing plate, an upper die plate and an upper die core. The lower die assembly sequentially comprises a lower die fixing plate, an ejector plate, a lower die plate and a lower die core. The upper mold assembly and the lower mold assembly are assembled to form an injection molding cavity, the injection molding cavity comprises a plurality of cavity subunits, and each cavity subunit correspondingly forms one battery insulation ring; a glue inlet hot runner is arranged on the inner side of the injection molding cavity and communicates with each cavity subunit; the injection molding cavity is provided with an exhaust channel, the exhaust channel is annularly arranged and wound around the outer side of the injection molding cavity, and the exhaust channel communicates with all the cavity subunits. The injection mold has excellent glue feeding and exhausting performance, and realizes the function of exhausting air in time under a one-mold multi-cavity structure, so that the production efficiency is greatly improved, and the injection molding quality of a product is improved.

Description

Technical Field

[0001] The utility model relates to a single-mold multi-cavity injection mold for producing battery insulating rings. Background Art

[0002] After nearly 10 years of development, the market requirements for the leakage resistance and safety of alkaline manganese batteries have been raised to a new level. The focus of its technical improvement will shift to the research of high-reliability battery technology. Sealing ring technology is the key technology in the research of high-reliability technology of alkaline manganese batteries and also the most difficult aspect of alkaline manganese battery technology.

[0003] The sealing ring not only determines the explosion-proof and leak-proof performance of alkaline dry batteries, but is also a key factor in solving battery explosion-proof and leak-proof problems. At the same time, the sealing ring structure also has a significant impact on the internal space of the battery. How to increase the effective space inside the battery to increase the filling amount of the positive and negative active materials of the battery is a necessary means to improve the overall discharge capacity of the battery. Therefore, how to optimize the battery sealing ring structure and the research on sealing ring materials is the main research direction of sealing ring technology.

[0004] As an example of prior art, see patent document CN201645759U, which discloses a mold for injection molding a battery insulating ring. The mold comprises an upper mold plate and a lower mold plate. The upper mold plate is provided with a first groove, with a cavity for the battery insulating ring formed on either side of the first groove. The lower mold plate is provided with a second groove, with punches mating with the cavity on either side of the second groove. A cutter body is mounted within the first groove, and the cutter body is provided with a sprue flow channel mating with the second groove. The sidewall of the cutter body is provided with a feed hole connecting the sprue flow channel and the cavity. This mold allows for easy automatic separation of the battery insulating ring and the sprue body during demolding, and has a relatively simple structure and low cost. However, this technical example lacks an effective venting channel structure, which prevents gas from being discharged in a timely manner during injection and filling, resulting in bubbles or short-flow in the molded part. These defects affect the appearance and physical properties of the molded part. Furthermore, air pockets or local overheating caused by the unexhausted air can cause local deformation or dimensional instability in the molded part. On the other hand, the high pressure and thermal stress generated during the filling process due to the inability to vent will accelerate the wear and damage of the mold and shorten the service life of the mold. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a single-mold multi-cavity injection mold for producing battery insulation rings.

[0006] The utility model solves the technical problem with a technical solution of: a single-mold multi-cavity injection mold for producing battery insulating rings, comprising an upper mold assembly and a lower mold assembly capable of being molded or separated with each other; the upper mold assembly sequentially comprises an upper mold fixing plate, an upper mold plate, and an upper mold core located in the upper mold plate; the lower mold assembly sequentially comprises a lower mold fixing plate, an ejection plate, a lower mold plate, and a lower mold core located in the lower mold plate; when the upper mold assembly and the lower mold assembly are molded together, an injection cavity for molding a product is formed between the upper mold core and the lower mold core;

[0007] The injection molding cavity includes a plurality of cavity subunits, and each cavity subunit is corresponding to forming a battery insulating ring;

[0008] The inner side of the injection cavity is provided with a hot runner for glue inlet, and the hot runner for glue inlet is communicated with each cavity sub-unit respectively;

[0009] The injection molding cavity is provided with an exhaust channel, which is arranged in an annular shape and arranged around the outside of the injection molding cavity. The exhaust channel is communicated with each cavity sub-unit respectively.

[0010] The specific solution for the glue inlet hot runner is that the glue inlet hot runner has a straight main runner section and several glue inlet branch sections connected to the straight main runner section, each glue inlet branch section is connected to a corresponding glue inlet port, and a glue injection port is provided in the upper mold assembly, and the straight main runner section is connected to the glue injection port.

[0011] The specific solution for the glue inlet is that the glue inlet includes a horizontal feeding section, a vertical latent section and a horizontal glue nozzle section in the order of flow.

[0012] The horizontal feeding section is connected to the glue feeding branch section and is in conduction;

[0013] The vertical latent section has a high point and a low point, and the high point and the low point are connected through an arc-shaped flow channel;

[0014] The horizontal nozzle section is in the shape of a trumpet that expands outward from the back to the front.

[0015] Preferably, the cavity subunit has a large-diameter annular cavity section and a small-diameter annular cavity section;

[0016] The vertical latent section is arranged around the periphery of the large-diameter annular cavity section, and the horizontal nozzle section is connected and conducted with the small-diameter annular cavity section.

[0017] A specific solution for the exhaust channel is that the exhaust channel has a racetrack-shaped main channel section and a plurality of exhaust branch channel sections connected to the racetrack-shaped main channel section;

[0018] Each exhaust branch section is connected to at least one gas introduction interface, the gas introduction interface is connected to the corresponding cavity sub-unit, and the racetrack-shaped main flow channel section is connected to the outside world through multiple external exhaust flow channel sections.

[0019] Furthermore, there are four outer discharge channel sections distributed around the racetrack-shaped main flow channel section.

[0020] In some preferred embodiments of the present invention, a first cooling channel is pre-embedded in the upper mold core, and a second cooling channel is pre-embedded in the lower mold core.

[0021] The ejector plate is provided with a plurality of rod-shaped cores, and each of the rod-shaped cores can extend into the cavity sub-unit accordingly.

[0022] In some preferred embodiments of the present invention, the rod-shaped core comprises a core sleeve and a plurality of interchangeable core rods, and the core rods and the core sleeve are detachably connected;

[0023] Each core rod has a contoured end portion with different shapes, and the contoured end portion extends out of the core sleeve and into the mold cavity.

[0024] In some preferred embodiments of the present invention, a support guide column is further provided between the upper die assembly and the lower die assembly, and a buffer spring is sleeved on the support guide column.

[0025] The beneficial effects of the present invention are:

[0026] 1. It has a one-mold multi-cavity structure. The number of cavity sub-units can be 12, 24, 48 or 96, so that 12, 24, 48 or 96 battery insulation rings can be molded through a single injection molding action, greatly improving production efficiency.

[0027] Second, it has excellent glue feeding and exhaust performance. During the injection filling process, the molten plastic material enters each cavity sub-unit through the glue feeding hot runner. The molten plastic material invades and squeezes the gas in the cavity sub-unit. In the one-mold multi-cavity structure, the gas is discharged from the exhaust channel under pressure, realizing the function of timely exhausting the gas, thereby improving the injection molding quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the present utility model.

[0029] Figure 2 It is a transverse sectional view of the present utility model.

[0030] Figure 3 It is a longitudinal sectional view of the present utility model.

[0031] Figure 4 It is a structural diagram of the lower mold core.

[0032] Figure 5 It is a structural diagram of the upper mold core.

[0033] Figure 6 It is a schematic diagram of the glue inlet and cavity subunit.

[0034] Figure 7 It is a product structure diagram of a battery insulation ring formed by the utility model.

[0035] Figure 8 Schematic comparison of rod-shaped cores with differently shaped contoured ends.

[0036] In the figure: 1. Upper mold assembly; 11. Upper mold fixing plate; 12. Upper mold plate; 13. Upper mold core; 131. First cooling channel; 2. Lower mold assembly; 21. Lower mold fixing plate; 22. Ejector plate; 23. Lower mold plate; 24. Lower mold core; 241. Second cooling channel; 3. Injection cavity; 31. Cavity subunit; 311. Large-diameter annular cavity section; 312. Small-diameter annular cavity section; 4. Glue inlet hot runner; 41. Linear main runner section; 42. Glue inlet branch section; 43. Glue inlet port; 431. Horizontal feed section; 43 2. Vertical latent section; 4321. High point; 4322. Low point; 4323. Arc flow channel; 433. Horizontal nozzle section; 5. Exhaust channel; 51. Runway-shaped main flow channel section; 52. Exhaust branch section; 53. Gas inlet interface; 54. External discharge flow channel section; 6. Battery insulation ring; 61. Upper large-diameter insulation section; 62. Lower small-diameter insulation section; 63. Gate material; 64. Inner hole; 7. Rod-shaped core; 71. Core sleeve; 72. Core rod; 721. Contoured end; 8. Support guide column; 81. Buffer spring. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely a specific description of the present invention, and their purpose is to allow those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limiting the present invention.

[0038] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] Example 1

[0041] Reference Figures 1 to 7 A single-mold multi-cavity injection mold for producing a battery insulating ring 6 includes an upper mold assembly 1 and a lower mold assembly 2 that can be molded or separated with each other; the upper mold assembly 1 sequentially includes an upper mold fixing plate 11, an upper mold plate 12, and an upper mold core 13 located in the upper mold plate 12; the lower mold assembly 2 sequentially includes a lower mold fixing plate 21, an ejection plate 22, a lower mold plate 23, and a lower mold core 24 located in the lower mold plate 23; when the upper mold assembly 1 and the lower mold assembly 2 are molded together, an injection cavity 3 for molding a product is formed between the upper mold core 13 and the lower mold core 24.

[0042] In the above, the injection molding cavity 3 includes a plurality of cavity sub-units 31, each cavity sub-unit 31 corresponds to molding one battery insulating ring 6, and the number of cavity sub-units 31 can be 12 or 24 or 48 or 96, so that 12 or 24 or 48 or 96 battery insulating rings 6 can be molded through a single injection molding action, greatly improving production efficiency.

[0043] The injection cavity 3 has a hot runner 4 for glue inlet on its inner side, which is in communication with each cavity subunit 31. Furthermore, the injection cavity 3 has an exhaust channel 5, which is arranged in an annular shape and surrounds the outer side of the injection cavity 3. The exhaust channel 5 is in communication with each cavity subunit 31. During the injection filling process, the molten plastic material enters each cavity subunit 31 through the hot runner 4. The molten plastic material invades and squeezes the gas in the cavity subunit 31, so that the gas is discharged from the exhaust channel 5 under the action of pressure, achieving the function of timely exhausting the gas, thereby improving the injection molding quality of the product.

[0044] Example 2

[0045] Based on the structure of the first embodiment, this embodiment provides a preferred solution for some structures, which are as follows:

[0046] 1. Glue hot runner 4: refer to Figures 4 and 5The mold assembly 1 has a linear main channel section 41 and several branch glue feed sections 42 connected to the linear main channel section 41. Each branch glue feed section 42 is connected to a corresponding glue inlet 43. The upper mold assembly 1 is provided with a glue injection port, and the linear main channel section 41 is connected to the glue injection port. By providing multiple branch glue feed sections 42, multiple battery insulation rings 6 can be molded simultaneously.

[0047] Reference Figure 6 , a specific solution of the glue inlet 43 is that the glue inlet 43 includes a horizontal feeding section 431, a vertical latent section 432 and a horizontal glue nozzle section 433 in the order of flow;

[0048] The horizontal feed section 431 is connected and conducted to the glue feed branch section 42;

[0049] The vertical latent section 432 has a high point 4321 and a low point 4322, which are connected to each other through an arc-shaped flow channel 4323. It is worth mentioning that when the battery insulation ring 6 has a double-layer structure, it specifically includes an upper large-diameter insulation section 61 and a lower small-diameter insulation section 62. Preferably, the cavity subunit 31 comprises a large-diameter annular cavity section 311 and a small-diameter annular cavity section 312. The large-diameter annular cavity section 311 is used to form the upper large-diameter insulating section 61 of the battery insulating ring 6, and the small-diameter annular cavity section 312 is used to form the lower small-diameter insulating section 62 of the battery insulating ring 6. The double-layered battery insulating ring 6 has better sealing performance when used in an actual battery. The vertical latent section 432 is arranged around the periphery of the large-diameter annular cavity section 311, and the horizontal nozzle section 433 is connected and conductive to the small-diameter annular cavity section 312. The provision of the vertical latent section 432 enables bending and circumvention in space, allowing the molten plastic material to be transported into the injection cavity 3 along a predetermined trajectory. The sprue 63 is then located at the lower small-diameter insulating section 62. Although there are traces and size defects on the lower small-diameter insulating section 62, the lower small-diameter insulating section 62 is located on the inner side and does not abut against the inner wall of the battery steel shell, so it will not affect the sealing performance and greatly reduce the probability of battery leakage.

[0050] The horizontal nozzle section 433 is a trumpet-shaped structure that expands outward from the back to the front, so that the initial injection stage has a greater pressure, a wider injection area, and effectively prevents the occurrence of blockage.

[0051] 2. Exhaust channel 5: refer to Figures 4 and 5The mold comprises a racetrack-shaped main runner section 51 and several exhaust branch sections 52 connected to it. Each exhaust branch section 52 is connected to at least one gas inlet port 53, which communicates with the corresponding cavity subunit 31. The racetrack-shaped main runner section 51 is connected to the outside world via multiple exhaust channel sections 54. The exhaust channel 5 effectively releases gas from the mold, improving injection quality, reducing injection pressure, shortening cooling time, and extending mold life.

[0052] In this embodiment, the distribution of the exhaust channel 5 and the glue feeding hot runner 4 is optimized. First, the glue feeding hot runner 4, the injection cavity 3, and the exhaust channel 5 are arranged in sequence from the inside to the outside, eliminating the bending sections, and realizing the functions of fast glue feeding and fast exhaust. Second, the exhaust channel 5 adopts an annular shape, which can enable each cavity sub-unit 31 to be connected to the runway-shaped main flow channel section 51 by the shortest path, shortening the exhaust length and improving the exhaust efficiency.

[0053] Furthermore, there are four outer discharge channel sections 54 distributed around the racetrack-shaped main flow channel section 51. Thus, the four outer discharge channel sections 54 can exhaust gas outwards separately, preventing gas accumulation and local high pressure, and timely exhausting the gas in the cavity to achieve a pressure reduction effect.

[0054] 3. Cooling structure: refer to Figure 3 The upper mold core 13 is pre-embedded with a first cooling channel 131, and the lower mold core 24 is pre-embedded with a second cooling channel 241. The first cooling channel 131 and the second cooling channel 241 are independently provided, and thus can be independently opened and the cooling temperature adjusted to achieve the best cooling effect for the upper mold core 13 and the lower mold core 24.

[0055] 4. Core: Refer to Figures 2 and 3 In order to form the inner hole 64 in the battery insulating ring 6, a plurality of rod-shaped cores 7 are provided in the ejection plate 22, and each of the rod-shaped cores 7 can be extended into the cavity sub-unit 31 accordingly.

[0056] Specifically, the rod-shaped core 7 includes a core sleeve 71 and a plurality of interchangeable core rods 72, wherein the core rods 72 and the core sleeve 71 are detachably connected; each core rod 72 has a contoured end 721 of different shapes, and the contoured end 721 extends out of the core sleeve 71 and into the mold cavity. For example, referring to Figure 8When a 2mm diameter inner hole 64 is required to be formed inside the battery insulating ring 6 product, a core rod 72 having a 2mm diameter profiling end 721 is used in conjunction with the core sleeve 71; when a 3mm diameter inner hole 64 is required to be formed inside the battery insulating ring 6 product, a core rod 72 having a 3mm diameter profiling end 721 is used in conjunction with the core sleeve 71. Alternatively, when a round hole is required to be formed inside the battery insulating ring 6 product, a core rod 72 having a cylindrical profiling end 721 is used in conjunction with the core sleeve 71; when a rectangular hole is required to be formed inside the battery insulating ring 6 product, a core rod 72 having a quadrangular prism-shaped profiling end 721 is used in conjunction with the core sleeve 71.

[0057] 5. Mould closing and parting buffer structure: refer to Figures 2 and 3 A support guide column 8 is further provided between the upper mold assembly 1 and the lower mold assembly 2, and a buffer spring 81 is sleeved on the support guide column 8.

[0058] The support guide 8 ensures precise alignment of the two halves of the mold during the mold opening and closing process. It effectively prevents the mold from misaligning when closing or opening, thereby ensuring the accuracy of the size and shape of the injection-molded product. It also bears the load, helping to stabilize the mold during the injection molding process and ensuring that the mold does not shift or deform during operation. The buffer spring 81 is provided to primarily provide shock absorption. During the mold opening and closing process, the rapid movement of the mold may cause impact force. In this case, the buffer spring 81 can effectively absorb some of the impact force, reducing wear on the mold components and thus extending the mold's service life.

[0059] It is worth noting that other technical solutions of the present invention belong to the existing technology and are therefore not described in detail.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A single-mold multi-cavity injection mold for producing battery insulating rings, comprising an upper mold assembly (1) and a lower mold assembly (2) capable of mutually closing or separating the molds; the upper mold assembly (1) sequentially comprises an upper mold fixing plate (11), an upper mold plate (12), and an upper mold core (13) located in the upper mold plate (12); the lower mold assembly (2) sequentially comprises a lower mold fixing plate (21), an ejection plate (22), a lower mold plate (23), and a lower mold core (24) located in the lower mold plate (23); when the upper mold assembly (1) and the lower mold assembly (2) are closed, an injection cavity (3) for molding a product is formed between the upper mold core (13) and the lower mold core (24); Its characteristics are: The injection molding cavity (3) includes a plurality of cavity subunits (31), and each cavity subunit (31) is used to mold a corresponding battery insulating ring (6); The inner side of the injection cavity (3) is provided with a hot runner (4) for feeding glue, and the hot runner (4) is respectively connected to each cavity subunit (31); The injection molding cavity (3) has an exhaust channel (5), which is arranged in an annular shape and arranged around the outside of the injection molding cavity (3). The exhaust channel (5) is communicated with each cavity subunit (31) respectively.

2. The multi-cavity injection mold for producing battery insulation rings according to claim 1, characterized in that: The glue inlet hot runner (4) has a straight main runner section (41) and a plurality of glue inlet branch sections (42) connected to the straight main runner section (41), each glue inlet branch section (42) is correspondingly connected to a glue inlet port (43), and a glue injection port is provided in the upper mold assembly (1), and the straight main runner section (41) is connected to the glue injection port.

3. The multi-cavity injection mold for producing battery insulation rings according to claim 2, characterized in that: The glue inlet (43) includes a horizontal feeding section (431), a vertical latent section (432) and a horizontal glue nozzle section (433) in the order of flow. The horizontal feeding section (431) is connected to and conducted with the glue feeding branch section (42); The vertical latent section (432) has a high point (4321) and a low point (4322), and the high point (4321) and the low point (4322) are connected through an arc-shaped flow channel (4323); The horizontal nozzle section (433) is in the shape of a trumpet that expands outward from the back to the front.

4. The multi-cavity injection mold for producing battery insulation rings according to claim 3, characterized in that: The cavity subunit (31) comprises a large-diameter annular cavity section (311) and a small-diameter annular cavity section (312); The vertical latent section (432) is arranged around the periphery of the large-diameter annular cavity section (311), and the horizontal nozzle section (433) is connected and conducted with the small-diameter annular cavity section (312).

5. The single-mold multi-cavity injection mold for producing battery insulation rings according to claim 1, characterized in that: The exhaust channel (5) comprises a racetrack-shaped main flow channel section (51) and a plurality of exhaust branch channel sections (52) connected to the racetrack-shaped main flow channel section (51); Each exhaust branch section (52) is connected to at least one gas introduction interface (53), the gas introduction interface (53) is connected to the corresponding cavity subunit (31), and the racetrack-shaped main flow channel section (51) is connected to the outside world through multiple external exhaust flow channel sections (54).

6. The multi-cavity injection mold for producing battery insulation rings according to claim 5, characterized in that: There are four outer discharge channel sections (54) distributed around the racetrack-shaped main channel section (51).

7. The multi-cavity injection mold for producing battery insulation rings according to claim 1, characterized in that: A first cooling channel (131) is pre-buried in the upper mold core (13), and a second cooling channel (241) is pre-buried in the lower mold core (24).

8. The multi-cavity injection mold for producing battery insulation rings according to claim 1, characterized in that: A plurality of rod-shaped cores (7) are provided in the ejection plate (22), and each of the rod-shaped cores (7) can extend into the cavity subunit (31) accordingly.

9. The multi-cavity injection mold for producing battery insulation rings according to claim 8, characterized in that: The rod-shaped core (7) comprises a core sleeve (71) and a plurality of core rods (72) that can be replaced with each other, and the core rods (72) and the core sleeve (71) are detachably connected. Each core rod (72) has a contoured end portion (721) of different shapes, and the contoured end portion (721) extends out of the core sleeve (71) and into the mold cavity.

10. The single-mold multi-cavity injection mold for producing battery insulation rings according to claim 1, characterized in that: A support guide column (8) is further provided between the upper die assembly (1) and the lower die assembly (2), and a buffer spring (81) is sleeved on the support guide column (8).

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