Battery cell injection mold with universal thickness and short circuit prevention function

Abstract

The utility model relates to a battery cell injection mould with general thickness and short circuit prevention, which comprises an upper mould base and a lower mould base which are arranged in sequence, an upper mould core arranged on the upper mould base and a lower mould core arranged on the lower mould base, the upper mould core comprises a mould core and an upper lantern ring sleeved on the periphery of the mould core, the upper lantern ring is arranged on the upper mould base, and the lower lantern ring is arranged on the lower mould base. The mold core can slide relative to the upper lantern ring and is elastically connected with the upper mold base through an elastic piece. The lower die core comprises a cavity and a lower lantern ring sleeved on the periphery of the cavity, an insulating block is arranged on the lower lantern ring, and the insulating block is opposite to a tab of the battery cell. According to the design of the mold, through the slidable mold core and an elastic connecting mechanism, the injection molding requirements of battery cells with different thicknesses can be flexibly met. And due to the design of the insulating blocks, the possibility of direct contact between the tabs or between the tabs and other parts of the mold in the injection molding process is effectively avoided, so that the risk of short circuit of the battery cell is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery cell injection molds, and more specifically, to a battery cell injection mold with universal thickness and short-circuit protection. Background Technology

[0002] During the production of ultra-thin battery cells, a frame is typically designed around them to enhance strength and facilitate subsequent installation and use. To ensure a stable connection between the cell and the frame, adhesive is injected at the joint, providing a secure bond and a waterproof seal. However, in practice, it has been found that variations in the raw materials used for the cells result in differences in cell thickness. Conventional injection mold designs require multiple sets of molds to accommodate different cell thicknesses, significantly increasing mold-making costs. Furthermore, when the cell is placed inside the mold, the positive and negative terminals come into contact with the mold, easily causing a short circuit. Currently, mold coating is often used to prevent short circuits, but this method still carries the risk of coating damage. Utility Model Content

[0003] In view of this, the present invention provides a universal thickness and short-circuit protection battery cell injection mold.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A universal thickness and short-circuit resistant battery cell injection mold includes an upper mold base and a lower mold base arranged sequentially, an upper mold core disposed on the upper mold base, and a lower mold core disposed on the lower mold base. The upper mold core includes a core and an upper sleeve sleeved around the outer periphery of the core. The upper sleeve sleeve is disposed on the upper mold base. The core is slidable relative to the upper sleeve sleeve and is elastically connected to the upper mold base through an elastic element. The lower mold core includes a cavity and a lower sleeve sleeved around the outer periphery of the cavity. An insulating block is provided on the lower sleeve sleeve, and the insulating block is opposite to the electrode tab of the battery cell.

[0006] In the above technical solution, during mold closing, the core is elastically connected to the upper mold base. Therefore, when the core and cavity are engaged, they can adaptively adjust according to the battery cell located inside them. For example, when the battery cell thickness is greater than a predetermined value, the battery cell can lift the core, meaning the elastic element contracts a certain distance, thus effectively preventing damage to the battery cell. When the battery cell thickness is less than the predetermined value, it also ensures effective contact between the core and the battery cell, avoiding the problem of glue overflow due to gaps. In addition, the insulating block set on the lower sleeve can effectively prevent short circuits caused by direct contact between the positive and negative electrodes of the battery cell and the mold during injection molding.

[0007] Therefore, the mold design of this utility model, through a sliding core and elastic connection mechanism, can flexibly adapt to the injection molding needs of battery cells of different thicknesses, eliminating the need for frequent replacement of mold components and significantly improving production efficiency and mold versatility. The design of the insulating block effectively avoids the possibility of direct contact between the tabs or between the tabs and other parts of the mold during the injection molding process, thereby greatly reducing the risk of short circuits in the battery cells and improving the safety performance of the product.

[0008] Optionally, in one possible implementation, the elastic element is a metal spring or elastic rubber, with one end connected to the upper mold base and the other end connected to the core.

[0009] In the above technical solution, both the metal spring and the elastic rubber have good buffering and shock absorption performance. On the one hand, they can better protect the battery cell and avoid damage to the battery cell. On the other hand, they can also effectively realize the elastic connection between the core and the upper mold base, so that the core can achieve thickness compensation for battery cells of different thicknesses, thereby maintaining the stability of the mold structure and the uniformity of the clamping force.

[0010] Optionally, in one possible implementation, the core is provided with a slot, the elastic element is located in the slot, and there are multiple slots and elastic elements provided in a corresponding manner.

[0011] In the above technical solution, the slot design provides installation space for the elastic element, improving the compactness of the mold structure. Furthermore, the design of multiple slots and elastic elements can disperse stress, and each elastic element can provide the expected buffering and support when the mold is closed, thereby increasing the support strength for the core.

[0012] Optionally, in one possible implementation, the insulating block is any one of a mica block, a glass block, a ceramic block, or a marble block.

[0013] All of the above materials possess excellent electrical insulation properties, effectively blocking current and preventing safety accidents caused by electrical short circuits or leakage during mold operation, thus ensuring the safety of the mold and operators. Furthermore, all of the above materials exhibit good high-temperature stability, maintaining stable physical and chemical properties even in the high-temperature environments in which the mold operates.

[0014] Optionally, in one possible implementation, there are at least two insulating blocks, and at least two insulating blocks are respectively opposite to the positive and negative tabs of the battery cell.

[0015] In the above technical solution, the two insulating blocks are respectively opposite to the positive and negative tabs of the battery cell, that is, the insulating blocks are in direct contact with the positive and negative tabs. This can effectively ensure electrical isolation between the battery cell and other parts of the mold, effectively prevent short circuits or leakage caused by electrical contact during the operation of the battery cell, and ensure the safety and reliability of the battery.

[0016] Optionally, in one possible implementation, the upper mold base is provided with an upper groove, the upper sleeve is disposed in the upper groove, the lower mold base is provided with a lower groove, and the lower sleeve is disposed in the lower groove.

[0017] In the above technical solution, the mating structure of the upper groove and upper collar, and the lower groove and lower collar, enhances the overall stability of the mold and facilitates its assembly. During the mold opening and closing process, these structures effectively prevent deformation or loosening of various parts of the mold due to uneven stress, thereby ensuring the long-term stability and durability of the mold.

[0018] Optionally, in one possible implementation, the lower mold base is provided with a clearance groove, the shape of which matches the external wiring of the battery cell.

[0019] In the above technical solution, the design of the clearance groove allows the external wiring harness of the battery cell to be placed in the clearance groove when the battery cell is placed into the mold. This not only facilitates the placement of the battery cell, but also avoids the squeezing or damage to the external wiring harness of the battery cell during the mold closing process. This helps to protect the integrity and reliability of the battery cell wiring harness and extend the service life of the battery cell.

[0020] Optionally, in one possible implementation, an injection runner is provided between the upper mold base and the lower mold base, the injection runner extending into the interior of the core and cavity.

[0021] In the above technical solution, the injection runner extends into the interior of the core and cavity, which can ensure that the injection material can fill the entire mold cavity evenly and quickly, avoid molding defects caused by uneven material distribution, optimize the injection process, reduce injection time and material waste, and improve production efficiency.

[0022] Optionally, in one possible implementation, the injection runner includes a main runner and several branch runners, the gate of the main runner is located on the side of the upper mold base and the lower mold base, and the branch runners are located on opposite sides of the battery cell.

[0023] In the above technical solution, by placing the main runner gate on the side of the mold and combining it with several branch runners evenly distributed on opposite sides of the battery cell, it can be ensured that the pressure of the injection molding material is evenly distributed throughout the cavity when filling the mold. This avoids underfilling or overfilling caused by uneven injection pressure, thus improving product quality and consistency. Furthermore, the branch runner design helps reduce defects such as bubbles and shrinkage cavities during the injection molding process. Because the branch runners can evenly guide the injection molding material to both sides of the battery cell, they prevent excessive accumulation or loss of material in localized areas, thereby reducing defects caused by uneven material distribution.

[0024] Optionally, in one possible implementation, the cores are two spaced apart within the upper collar, and the cavities are two spaced apart within the lower collar, with each cavity corresponding to one of the two cores.

[0025] In the above technical solution, the paired design of the core and cavity allows for the simultaneous injection molding of two products, thus significantly improving production efficiency. Compared with molds using a single core and cavity, this design can produce more products in the same time, shortening the production cycle. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is an exploded view of the overall structure of one embodiment.

[0028] Figure 2 This is a schematic diagram of the mold core structure in one embodiment.

[0029] Figure 3 This is a schematic diagram of the upper mold base in one embodiment.

[0030] Reference numerals in the attached drawings: 1-Upper mold base; 11-Upper groove; 2-Lower mold base; 21-Lower groove; 22-Allowing groove; 3-Upper mold core; 31-Core; 32-Upper collar; 4-Lower mold core; 41-Cavity; 42-Lower collar; 5-Elastic element; 6-Insulating block; 7-Injection runner; 71-Main runner; 72-Branch runner; 8-Battery cell. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] Please refer to Figure 1 This embodiment provides a universal thickness and short-circuit resistant injection mold for a battery cell 8, including an upper mold base 1 and a lower mold base 2 arranged sequentially, an upper mold core 3 disposed on the upper mold base 1, and a lower mold core 4 disposed on the lower mold base 2. The upper mold core 3 includes a core 31 and an upper collar 32 sleeved around the outer periphery of the core 31. The upper collar 32 is disposed on the upper mold base 1, and the core 31 can slide relative to the upper collar 32 and is elastically connected to the upper mold base 1 through an elastic member 5. The lower mold core 4 includes a cavity 41 and a lower collar 42 sleeved around the outer periphery of the cavity 41. An insulating block 6 is provided on the lower collar 42, and the insulating block 6 is opposite to the electrode tab of the battery cell 8. Specifically, when the upper mold base 1 and the lower mold base 2 are closed, the core 31 and the cavity 41 can be combined together, and a cavity for placing the battery cell 8 is formed between them.

[0034] In this embodiment, during mold closing, the upper mold base 1 and lower mold base 2 are elastically connected to the upper mold base 1. Therefore, when the core 31 and the cavity 41 are engaged, they can adaptively adjust according to the battery cell 8 located inside them. For example, when the thickness of the battery cell 8 is greater than a predetermined value, the battery cell 8 can lift the core 31, that is, the elastic element 5 contracts a certain distance, thus effectively avoiding damage to the battery cell 8. When the thickness of the battery cell 8 is less than the predetermined value, it can also ensure that the core 31 can effectively contact the battery cell 8, avoiding the problem of glue overflow due to gaps. In addition, the insulating block 6 provided on the lower sleeve 42 can effectively prevent the positive and negative electrodes of the battery cell 8 from directly contacting the mold during the injection molding process, thus preventing short circuits.

[0035] Therefore, the mold design in this embodiment, through the sliding core 31 and elastic connection mechanism, can flexibly adapt to the injection molding requirements of battery cells 8 with different thicknesses, eliminating the need for frequent replacement of mold components and significantly improving production efficiency and mold versatility. The design of the insulating block 6 effectively avoids the possibility of direct contact between the tabs or between the tabs and other parts of the mold during the injection molding process, thereby greatly reducing the risk of short circuits in the battery cells 8 and improving the safety performance of the product.

[0036] In this embodiment, the elastic element 5 is a metal spring or elastic rubber, with one end connected to the upper mold base 1 and the other end connected to the core 31. Both the metal spring and the elastic rubber have good buffering and shock absorption properties, which can better protect the battery cell 8 and prevent damage to it. On the other hand, they can also effectively achieve an elastic connection between the core 31 and the upper mold base 1, allowing the core 31 to compensate for the thickness of the battery cell 8 with different thicknesses, thereby maintaining the stability of the mold structure and the uniformity of the clamping force. It should be noted that in this embodiment, a metal spring is preferred, and the metal spring can be fixedly connected to the upper mold base 1 and the core 31 by welding.

[0037] In this embodiment, the core 31 is provided with slots, and the elastic element 5 is located within the slots. Multiple slots and elastic elements 5 are correspondingly provided. Specifically, the slots can be blind holes, located on the side of the core 31 opposite to the upper mold base 1. In this embodiment, four slots and four elastic elements 5 are provided on the same core 31, and the four slots are distributed in a rectangular array.

[0038] The slot design provides installation space for the elastic element 5, improving the compactness of the mold structure. In addition, the design of multiple slots and elastic elements 5 can disperse stress, and each elastic element 5 can play the expected buffering and supporting role when the mold is closed, thereby improving the support strength for the core 31.

[0039] In this embodiment, the insulating block 6 is any one of mica, glass, ceramic, or marble, with ceramic being preferred. All of these materials possess excellent electrical insulation properties, effectively blocking current and preventing safety accidents caused by electrical short circuits or leakage during mold operation, thus ensuring the safety of the mold and operators. Furthermore, all of these materials exhibit good high-temperature stability, maintaining stable physical and chemical properties even under the high-temperature environment of mold operation.

[0040] Please refer to Figure 2 In this embodiment, there are at least two insulating blocks 6, and at least two insulating blocks 6 are respectively opposite to the positive and negative tabs of the battery cell 8. Specifically, the two insulating blocks 6 are embedded in the lower collar 42, and the cross-sectional area of ​​the insulating blocks 6 is larger than the area of ​​the tabs of the battery cell 8, so as to effectively ensure that the insulating blocks 6 can completely cover the tabs.

[0041] The two insulating blocks 6 are respectively opposite to the positive and negative tabs of the battery cell 8, that is, the insulating blocks 6 are in direct contact with the positive and negative tabs. This can effectively ensure electrical isolation between the battery cell 8 and other parts of the mold, effectively prevent short circuits or leakage caused by electrical contact during the operation of the battery cell 8, and ensure the safety and reliability of the battery.

[0042] Of course, as another implementation, the insulating block 6 can also be a single piece. In this case, the length of the insulating block 6 should meet certain parameters, namely, ensuring that the insulating block 6 can span the distance between the positive and negative tabs of the battery cell 8, and ensuring that both the positive and negative tabs are covered by the insulating block 6.

[0043] Please refer to Figure 3 In this embodiment, the upper mold base 1 is provided with an upper groove 11, and an upper collar 32 is disposed within the upper groove 11. The lower mold base 2 is provided with a lower groove 21, and a lower collar 42 is disposed within the lower groove 21. The mating structure of the upper groove 11 and the upper collar 32, and the lower groove 21 and the lower collar 42, enhances the overall stability of the mold and facilitates mold assembly. During the opening and closing of the mold, these structures can effectively prevent deformation or loosening of various parts of the mold due to uneven stress, thereby ensuring the long-term stability and durability of the mold.

[0044] It should be noted that the lower mold base 2 is provided with a clearance groove 22, the shape of which matches the external wiring of the battery cell 8. Specifically, the clearance groove 22 is located on the lower collar 42. The design of the clearance groove 22 allows the external wiring of the battery cell 8 to be placed within the clearance groove 22 when the battery cell 8 is placed into the mold. This not only facilitates the placement of the battery cell 8 but also prevents the external wiring of the battery cell 8 from being squeezed or damaged during the mold closing process. This helps to protect the integrity and reliability of the battery cell 8 wiring and extends the service life of the battery cell 8.

[0045] Please refer to Figure 2 In this embodiment, an injection runner 7 is provided between the upper mold base 1 and the lower mold base 2, extending into the interior of the core 31 and the cavity 41. The extension of the injection runner 7 into the interior of the core 31 and the cavity 41 ensures that the injection material can uniformly and quickly fill the entire mold cavity 41, avoiding molding defects caused by uneven material distribution, optimizing the injection process, reducing injection time and material waste, and improving production efficiency.

[0046] Specifically, the injection runner 7 includes a main runner 71 and several branch runners 72. The gate of the main runner 71 is located on the side of the upper mold base 1 and the lower mold base 2, and the branch runners 72 are located on opposite sides of the battery cell 8. Among them, the branch runners 72 are located on the upper collar 32 and the lower collar 42.

[0047] By placing the main runner 71 on the side of the mold and combining it with several branch runners 72 evenly distributed on opposite sides of the battery cell 8, it is ensured that the injection material pressure is evenly distributed throughout the cavity 41 during mold filling. This avoids underfilling or overfilling caused by uneven injection pressure, improving product quality and consistency. Furthermore, the design of the branch runners 72 helps reduce defects such as bubbles and shrinkage cavities during injection molding. Because the branch runners 72 can evenly guide the injection material to both sides of the battery cell 8, excessive accumulation or loss of material in localized areas is avoided, thereby reducing defects caused by uneven material distribution.

[0048] In this embodiment, there are two cores 31 spaced apart within the upper collar 32, and two cavities 41 spaced apart within the lower collar 42. The two cavities 41 correspond to the two cores 31 respectively.

[0049] The paired design of core 31 and cavity 41 allows for the simultaneous injection molding of two products, significantly improving production efficiency. Compared to molds with a single core 31 and cavity 41, this design can produce more products in the same time, shortening the production cycle.

[0050] It should be noted that, since the core 31 and the cavity 41 are two corresponding sets, and in order to ensure that two battery cells 8 can be injection molded, the number of runners 72 needs to be increased. For example, in this embodiment, the runners 72 are designed as three runners, which are arranged in parallel. Each pair of adjacent runners 72 corresponds to one battery cell 8, meaning that the middle runner 72 can simultaneously injection mold two battery cells 8. In addition, each runner 72 is provided with multiple injection ports to improve the uniformity of injection.

[0051] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal thickness and short-circuit resistant battery cell injection mold, comprising an upper mold base and a lower mold base arranged sequentially, an upper mold core disposed on the upper mold base, and a lower mold core disposed on the lower mold base, characterized in that, The upper mold core includes a core and an upper sleeve sleeved around the outer periphery of the core. The upper sleeve sleeve is disposed on the upper mold base. The core can slide relative to the upper sleeve sleeve and is elastically connected to the upper mold base through an elastic element. The lower mold core includes a cavity and a lower sleeve sleeved around the outer periphery of the cavity. An insulating block is provided on the lower sleeve sleeve, and the insulating block is opposite to the electrode tab of the battery cell.

2. The universal thickness and short-circuit protection cell injection mold according to claim 1, characterized in that, The elastic element is a metal spring or elastic rubber, with one end connected to the upper mold base and the other end connected to the core.

3. The universal thickness and short-circuit protection cell injection mold according to claim 2, characterized in that, The core is provided with a slot, and the elastic element is located in the slot. There are multiple slots and elastic elements provided in a corresponding manner.

4. The universal thickness and short-circuit protection cell injection mold according to claim 1, characterized in that, The insulating block can be any one of mica block, glass block, ceramic block or marble block.

5. The universal thickness and short-circuit protection cell injection mold according to claim 1, characterized in that, There are at least two insulating blocks, and at least two insulating blocks are respectively opposite to the positive and negative tabs of the battery cell.

6. The universal thickness and short-circuit protection cell injection mold according to claim 1, characterized in that, The upper mold base is provided with an upper groove, and the upper sleeve is disposed in the upper groove. The lower mold base is provided with a lower groove, and the lower sleeve is disposed in the lower groove.

7. The universal thickness and short-circuit protection cell injection mold according to claim 1, characterized in that, The lower mold base is provided with a clearance groove, the shape of which matches the external wiring of the battery cell.

8. The universal thickness and short-circuit protection cell injection mold according to claim 1, characterized in that, An injection runner is provided between the upper mold base and the lower mold base, and the injection runner extends into the interior of the core and cavity.

9. The universal thickness and short-circuit resistant battery cell injection mold according to claim 8, characterized in that, The injection runner includes a main runner and several branch runners. The gate of the main runner is located on the side of the upper mold base and the lower mold base, and the branch runners are located on opposite sides of the battery cell.

10. The universal thickness and short-circuit resistant cell injection mold according to any one of claims 1-9, characterized in that, The cores are two spaced apart within the upper collar, and the cavities are two spaced apart within the lower collar, with each cavity corresponding to one of the cores.

Images