Injection mold

Abstract

The injection mold is used for producing a battery pack shell with a top plate, a side wall, a notch and an annular skirt structure, the injection mold comprises a movable mold and a fixed mold, the movable mold comprises a female mold provided with a first plane and a first mold core, the fixed mold comprises a male mold parallel to the female mold, the male mold is provided with a groove in a second plane, and a second mold core is arranged in the groove; the second mold core comprises a plurality of cushion blocks, a blank pressing assembly which is connected with the cushion blocks, arranged in a suspended mode and composed of a plurality of blank pressing pieces, a side edge assembly which is located on the side, away from the cushion blocks, of the blank pressing assembly and composed of a plurality of first filling pieces, and a filling assembly connected with the side edge assembly. According to the injection mold, the components are combined to form three forming spaces of the top plate, the side wall, the skirt edge and the notch, and each component is of a detachable combined structure, so that the adaptive problem that an existing mold core structure cannot be replaced is effectively solved, flexible replacement of the edge pressing component and the notch structure is realized, and the universality and the production efficiency of the mold are improved.

Description

Technical Field

[0001] This utility model relates to a mold, and more particularly to an injection mold. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, battery packs, as key components for energy storage and management, are receiving increasing attention for their structural design and manufacturing processes. The battery pack casing, as a crucial part of the battery pack, must possess excellent sealing performance, structural strength, and ease of assembly. To meet the industrial demands for efficient production, reliability, and compatibility with multiple models, an increasing number of battery pack casings are being manufactured using injection molding in a single process. The casing structure typically includes a top plate and several side plates connected around it, forming an accommodating space. Functional slots and edge skirts are provided on the side walls to achieve functions such as connection, fixation, and sealing.

[0003] Existing injection mold structures typically include a moving mold and a fixed mold. The fixed mold contains grooves and a mold core structure for molding. Specifically, to form the annular skirt structure for positioning and sealing on the battery pack casing, as well as several slots on the sidewalls, the fixed mold includes a pressing component and a side component. These components are mostly integrated with the mold core; that is, the pressing component and the side component are embedded in the mold as a second mold core.

[0004] However, when it is necessary to replace the battery pack casing with different models (e.g., different skirt shapes, changes in the number or size of slots), it is usually necessary to redesign and process the entire mold core. This not only increases the mold manufacturing cost but also greatly reduces the mold's versatility and adaptability, hindering rapid switching between multiple product models and small-batch customized production. Therefore, there is an urgent need to propose an injection mold to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide an injection mold that improves the versatility and adaptability of the mold, reduces the cost of mold modification and manufacturing, and improves production efficiency by designing the pressing component and side component used for molding the annular skirt structure and the side wall groove of the shell as structures that can be detachably connected to the second mold core.

[0006] The technical solution adopted by this utility model to solve the above problems is: an injection mold for producing a battery pack housing. The battery pack housing includes a top plate and several side plates disposed around the top plate and forming side walls. The side plates and the top plate together form an accommodating space. Several slots are opened on one side of the side wall, and an annular skirt structure is provided at the edge of the side wall away from the top plate.

[0007] A moving model, wherein the moving model is subject to controlled motion, the moving model comprising:

[0008] The die includes a first plane;

[0009] The first mold core is disposed at the first plane;

[0010] Fixed mold, including:

[0011] A punch is arranged parallel to the die. The punch includes a second plane parallel to the first plane. The second plane is oriented opposite to the first plane. The punch has a groove on the second plane.

[0012] A second mold core, disposed within the groove, comprises:

[0013] Several pads are disposed on the side of the inner wall of the groove away from the second plane;

[0014] A pressing edge assembly is connected to the pad block to suspend the pressing edge assembly relative to the inner wall of the groove via the pad block; the pressing edge assembly consists of several detachably connected pressing edge components;

[0015] A side assembly is disposed on the side of the pressing edge assembly opposite to the pad block, the side assembly being composed of a plurality of detachably connected first filler assemblies;

[0016] A filling component is connected to the side component.

[0017] When the moving mold and the fixed mold are in the closed state, molten plastic is injected into the injection space for forming the battery pack housing, which is composed of the concave mold, the first mold core, the inner wall of the groove, and the second mold core. The filling component, through its cooperation with the pad, the pressing component, the side component, the inner wall of the groove, and the first mold core, provides a first forming space for the top plate and side walls of the battery pack housing. The pressing component, through its cooperation with the inner wall of the groove, the pad, and the first mold core, provides a second forming space for the annular skirt structure. The side component, through its cooperation with the inner wall of the groove, the pressing component, the filling component, and the first mold core, provides a third forming space for the slots in the side walls of the battery pack housing.

[0018] Preferably, the pressing edge assembly and the side edge assembly are detachably connected.

[0019] Preferably, the side assembly and the pressing edge assembly are detachably connected.

[0020] Preferably, the side assembly includes:

[0021] A frame body, which is connected to the pressing edge assembly, and the frame body includes several mounting slots.

[0022] Each of the first fillers is installed in the respective mounting slots in a one-to-one correspondence manner. The first filler is positioned so that one end of the first filler protrudes from the corresponding side of the frame body facing the filling assembly, and the protruding end of the first filler corresponding to the side of the frame body is defined as the protruding end.

[0023] Preferably, the filling component includes a plurality of filling plates, each of which is detachably connected to the frame. The connection side between the frame and the filling plate is such that the protruding end of the first filling member protrudes from one side of the frame. Furthermore, a preset gap is provided between the side of the filling plate facing the frame and the side of the frame facing the filling plate, so as to provide injection molding space for the forming of the sidewall of the battery pack housing.

[0024] Preferably, the length by which the protruding end of the first filler protrudes from the side of the frame is equal to the preset gap.

[0025] Preferably, the filling plate furthest from the pressing assembly has several rib grooves on the side opposite to the pressing assembly.

[0026] Preferably, the pressing element is provided with several detachably connected inserts.

[0027] Preferably, the first mold core is detachably connected to the cavity mold, and the side of the first mold core opposite to the cavity mold has a concave-convex structure.

[0028] The beneficial effects of the embodiments of this utility model are as follows:

[0029] Because the edge-pressing assembly is composed of several detachably connected edge-pressing parts, and the side assembly is composed of several detachably connected first filler assemblies, which cooperate with the pad and filler assembly to form the injection molding space, the technical means effectively solves the problem in the existing technology where the edge-pressing assembly and side assembly are integrally molded with the mold core and cannot be flexibly replaced. Thus, when producing battery pack shells of different models, the technical effect of structural adaptation can be achieved by simply replacing the edge-pressing parts and / or filler parts without replacing the entire mold core. This significantly improves the versatility and modularity of the mold, reduces the mold replacement and manufacturing costs, and enhances the adaptability and production efficiency of multiple product models. Attached Figure Description

[0030] Figure 1 This is a schematic exploded view of an injection mold proposed in one embodiment of the present invention. Figure 1 .

[0031] Figure 2 This is a schematic exploded view of an injection mold proposed in one embodiment of the present invention. Figure 2 .

[0032] Figure 3This is a schematic top view of an injection mold proposed in one embodiment of the present invention.

[0033] Wherein: 10, battery pack housing; 110, top plate; 120, side plate; 121, slot; 130, accommodating space; 140, skirt structure; 20, second mold core; 210, pad block; 220, pressing edge assembly; 230, side assembly; 231, frame; 232, first filler; 240, filler assembly; 241, filler plate. Detailed Implementation

[0034] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Please see Figures 1 to 3In a preferred embodiment of this application, an injection mold is provided. The target product of the injection mold is a battery pack housing 10. The battery pack housing 10 includes a top plate 110 and a plurality of side plates 120 disposed around the top plate 110 and forming side walls. The plurality of side plates 120 and the top plate 110 together form an accommodating space 130. A plurality of slots 121 are provided on one side of the side wall, and an annular skirt structure 140 is provided at the edge of the side wall away from the top plate 110.

[0038] The injection mold in this embodiment includes a moving mold (not shown in the figure) and a fixed mold. The moving mold includes a cavity (not shown in the figure) and a first mold core (not shown in the figure). The moving mold is subject to controlled movement. The moving mold includes a cavity and a first mold core. The cavity includes a first plane, and the first mold core is disposed at the first plane. The fixed mold includes a punch and a second mold core 20. The punch is arranged parallel to the die. The punch includes a second plane parallel to the first plane. The second plane is arranged opposite to the first plane. The punch has a groove on the second plane. The second mold core 20 is disposed in the groove. The second mold core 20 includes a plurality of pads 210, a pressing component 220, a side component 230, and a filling component 240. The pads 210 are all disposed on the side of the inner wall of the groove away from the second plane. The pressing component 220 is connected to the pads 210 so that the pressing component 220 is suspended relative to the inner wall of the groove through the pads 210. The pressing component 220 is composed of a plurality of detachably connected pressing parts. The side component 230 is disposed on the side of the pressing component 220 away from the pads 210. The side component 230 is composed of a plurality of detachably connected first filling parts 232. The filling component 240 is connected to the side component 230.

[0039] When the moving mold and the fixed mold are in the closed state, molten injection plastic is injected into the injection space for forming the battery pack housing 10, which is composed of the concave mold, the first mold core, the inner wall of the groove, and the second mold core 20. The filling component 240, through its cooperation with the pad 210, the pressing component 220, the side component 230, the inner wall of the groove, and the first mold core, provides a first forming space for the top plate 110 and side walls of the battery pack housing 10. The pressing component 220, through its cooperation with the inner wall of the groove, the pad 210, and the first mold core, provides a second forming space for the annular skirt structure 140. The side component 230, through its cooperation with the inner wall of the groove, the pressing component 220, the filling component 240, and the first mold core, provides a third forming space for the slot 121 of the side wall of the battery pack housing 10.

[0040] Specifically:

[0041] The moving mold can move in a controlled manner along the mold closing direction under the action of the injection molding machine. It includes a cavity mold with a first plane and a first mold core installed on the plane. The mold core provides a positioning reference for the molding of the top plate 110 and part of the side plate 120.

[0042] The fixed mold is fixedly installed on the fixed template of the injection molding machine and cooperates with the moving mold to close the mold. The fixed mold is provided with a punch that is parallel to the die. The punch has an opening groove at the second plane opposite to the first plane, and the second mold core 20 is embedded in the groove.

[0043] The second mold core 20 is formed by assembling multiple components, including a pad 210 located on the side of the inner wall of the groove away from the second plane, a pressing component 220 connected to the pad 210 to suspend the pressing component 220 in the groove, a side component 230 installed on the other side of the pressing component 220, and a filling component 240 installed on the outside of the side component 230 and cooperating with it to form a complete side wall and the edge of the top plate 110. The pressing component 220 consists of several detachably connected pressing parts, specifically long strip pressing plates and "L"-shaped pressing plates at corners. When all pressing parts are assembled, a ring structure corresponding to the size and shape of the skirt structure 140 of the target battery pack housing 10 is formed. The components are precisely positioned and detachably connected through positioning pins, limiting grooves, screws, or sliding blocks, adapting to different structural forms of the battery pack housing 10.

[0044] During the injection molding process, the moving mold closes with the fixed mold under the drive of the injection molding machine, forming a complete injection cavity. The specific molding areas include:

[0045] The first forming space is defined by the filling component 240, the pad block 210, the pressing component 220, the side component 230, the inner wall of the groove, and the first mold core, and is used to form the top plate 110 and the side wall body of the shell.

[0046] The second forming space is formed by the cooperation of the edge pressing assembly 220, the pad block 210, the inner wall of the groove and the first mold core, and is used to form the annular skirt structure 140.

[0047] The third forming space is formed by the cooperation of the side component 230, the filling component 240, the pressing component 220 and the first mold core, and is used to form the slot 121 structure on the side wall of the shell.

[0048] After the mold is closed, molten plastic raw material is injected into the injection space using an injection molding machine. After cooling, a complete shell structure is formed, and the product can be removed after the mold is opened.

[0049] When it is necessary to replace the housing with a different model, the operator can quickly disassemble the pressing assembly 220, the side assembly 230 and the filling assembly 240 and replace them with standard parts that are adapted to the new housing design, without having to replace the entire mold core module, saving time and cost.

[0050] In this embodiment, due to the modular design of the pressing component 220 and the side component 230, and their detachable connection with the second mold core 20, the mold can quickly switch functional modules according to different battery pack housings 10, effectively solving the problem of fixed mold core structures and the need for complete replacement when updating structures in traditional molds. This solution significantly reduces mold manufacturing and replacement costs, improves mold versatility and production flexibility, and is particularly suitable for the rapid development and verification needs of diverse housing structures in the current new energy vehicle field. At the same time, while ensuring product dimensional accuracy and structural strength, it effectively improves production efficiency and market responsiveness.

[0051] It should be noted that the aforementioned injection molds typically also include basic structural units such as mold base (not shown in the figure), guiding mechanism (not shown in the figure), clamping mechanism (not shown in the figure), cooling system (not shown in the figure), staging structure (not shown in the figure), gating system (not shown in the figure), and demolding mechanism (not shown in the figure). These basic structural units are not related to the technical problem to be solved in this application and are all prior art, so they will not be described in detail here. Those skilled in the art can choose a suitable basic structure according to the production situation.

[0052] In some embodiments, the pressing edge assembly 220 and the side edge assembly 230 are detachably connected.

[0053] The pressing assembly 220 is typically disposed inside the groove of the mold fixed mold and is supported by the pad 210 to be in a suspended position relative to the inner wall of the groove, for defining the skirt forming area of ​​the battery pack housing 10. The side assembly 230 is disposed on the side of the pressing assembly 220 opposite to the pad 210, for defining the forming space of the groove 121 on the side wall of the housing.

[0054] To enable quick replacement and flexible configuration, the pressing assembly 220 and the side assembly 230 are detachably connected. Preferred connection structures include screw connections, pin connections, dovetail sliding snap-fit ​​structures, or magnetic adsorption positioning structures. The side assembly 230 can be aligned with the mounting holes or guide rails on the pressing assembly 220 via positioning pins, and assembly is completed by tightening or snapping. The components are preferably made of high-strength mold steel or chrome-plated wear-resistant alloy to ensure structural accuracy and service life during repeated assembly and disassembly.

[0055] In actual operation, after the injection mold completes the mold closing action, the plastic is injected into the mold cavity through the runner. The space defined between the blank holder assembly 220 and the side assembly 230 jointly participates in the injection molding of the shell structure, respectively corresponding to the precision forming of the skirt area and the slot 121 structure. Through the detachable connection method, the side assembly 230 can be quickly replaced according to changes in the number, size, or shape of the slots 121. The operator only needs to remove the fixed structure to replace the appropriate parts without replacing the entire mold core or blank holder assembly 220.

[0056] This structure is particularly suitable for product modification, customized manufacturing, or trial production stages, and can significantly shorten mold debugging and changeover time, thereby improving overall operational efficiency.

[0057] In this embodiment, the detachable connection structure between the pressure edge assembly 220 and the side assembly 230 solves the problem of the side structure being integrally formed with the mold core and difficult to replace in the prior art. This design achieves independent modularity of the housing slot 121 structure, making replacement convenient and the structure flexible. It is particularly suitable for producing products such as battery pack housings 10 of various models and specifications, and has significant versatility and expandability. Compared with the traditional structure, it greatly reduces mold change time and manufacturing costs, and improves the adaptability and response speed of the production line.

[0058] In some embodiments, the side assembly 230 includes a frame 231 connected to the pressing edge assembly 220, and the frame 231 includes a plurality of mounting slots. Each of the first filler members 232 is installed in a corresponding mounting slot, and one end of the first filler member 232 protrudes from the corresponding side of the frame 231 facing the filling assembly 240, and the protruding end of the first filler member 232 corresponding to the side of the frame 231 is defined as the protruding end.

[0059] In this embodiment, the side component 230 adopts a modular structure design, which mainly includes a frame 231. The frame 231 is preferably a rectangular structure, and the material can be high-strength mold steel or heat-resistant alloy, which ensures both structural strength and good machinability and thermal stability.

[0060] The frame 231 is connected to the pressing assembly 220 via positioning pins, screws, or dovetail grooves to achieve a stable fit and facilitate disassembly. The frame 231 has several mounting slots, the number of which corresponds one-to-one with the number of slots 121 required on the side wall of the battery pack housing 10, for mounting multiple first filler elements 232.

[0061] Each first filler 232 is an independent module that can be inserted into the corresponding mounting slot of the frame 231. The installation method can be a sliding type, a snap-fit ​​type, or a locking type. In the installed state, one end of each first filler 232 protrudes from the corresponding side of the frame 231, forming a "protruding end". This end is used to limit the injection space when the mold is closed, thereby forming a functional slot 121 structure on the side wall of the shell. Furthermore, the length, height, and shape of the protruding end can be customized according to the requirements of the slot 121, such as a rectangular protrusion, a chamfered structure, or an arc-shaped embedded structure, to adapt to different shell structure forms.

[0062] During the mold closing process, each of the first filler components 232 installed inside the frame 231 is inserted into the corresponding molding space area with its protruding end, and together with the first mold core, the filler component 240 and the inner wall of the groove, they define the injection space of the slot 121 on the side wall of the battery pack housing 10.

[0063] During injection molding, the molten plastic fills the mold cavity and then cools and solidifies. The protruding end of the first filler 232 is pressed into the cavity and generates a corresponding negative mold, thereby realizing the one-time injection molding of the side wall groove 121 structure.

[0064] When using this structure, operators can replace only the first filler 232 according to the change of the housing model, without having to replace the entire side assembly 230, frame 231 or mold core structure, which greatly improves the structural adaptability and ease of replacement.

[0065] Furthermore, this structure is applicable to various types of battery pack housing 10 injection molds, and is particularly suitable for multi-model flexible manufacturing needs with varying numbers, positions or sizes of housing sidewall slots 121, small-batch production scenarios with high frequency of structural component replacement, and injection mold designs with limited installation space but requiring precise structure and tight fit.

[0066] In this embodiment, the use of a frame 231 and multiple detachable first filler components 232 creates a highly modular and customizable side assembly 230, overcoming the problems of fixed sidewall structures and lack of flexible adjustment in traditional injection molds. The filler components participate in the cavity structure construction with protruding ends, ensuring not only the integrity and precision of the shell slot 121 structure but also enabling quick replacement and installation. This design effectively solves the problems of high mold core replacement costs and poor adaptability in existing technologies, and is particularly suitable for rapid development of multiple product models, offering significant advantages in improving production efficiency, reducing manufacturing costs, and enhancing structural versatility.

[0067] In some embodiments, the filling assembly 240 includes a plurality of filling plates 241, each of which is detachably connected to the frame 231. The connection between the frame 231 and the filling plates 241 is such that the protruding end of the first filling member 232 protrudes from one side of the frame 231. A predetermined gap is maintained between the side of the filling plate 241 facing the frame 231 and the side of the frame 231 facing the filling plate 241, providing injection molding space for the forming of the sidewall of the battery pack housing 10. The length of the protruding end of the first filling member 232 protruding from the side of the frame 231 is equal to the predetermined gap.

[0068] In this embodiment, the filling component 240 is composed of several filling plates 241. The filling plates 241 have a flat structure and can be made of wear-resistant mold steel or heat-treated alloy materials to ensure strength and molding accuracy. Each filling plate 241 is detachably connected to the frame 231 of the side component 230, such as by screws, slider rails, or dovetail quick-release structures.

[0069] The filler plate 241 is disposed on the side of the frame 231 facing the mold cavity, and a preset gap is formed between its connecting edge and the frame 231. This gap is used to define the injection space of the side wall of the battery pack housing 10 during injection molding. The protruding end of each first filler 232 extends from the corresponding side of the frame 231 to one side of the filler plate 241, and its extension length is equal to the size of the preset gap, so as to achieve a precise fit between the filler and the filler plate 241.

[0070] The shape of the filler plate 241 can be customized according to the side wall structure of the battery pack housing 10, usually as a rectangular or irregular curved plate, used to close the outside of the molding space to ensure that no overflow or deformation occurs after the plastic is injected.

[0071] After the moving mold and the fixed mold are closed, the frame 231, the filler plate 241, and the protruding first filler 232 together define the injection molding area of ​​the side wall of the battery pack housing 10. The preset gap between the filler plate 241 and the frame 231 is the space for the shape and thickness of the side wall to be formed after the plastic is injected.

[0072] During injection molding, molten plastic enters the mold cavity through the runner, filling the gap between the frame 231 and the filler plate 241, and gradually solidifies during cooling, thus forming the side wall structure of the shell in one step. Since the length of the protruding end of the first filler 232 is exactly equal to the gap, the filler can serve as both a limiting surface for the side wall thickness and a boundary control function for the injection cavity.

[0073] After cooling is complete, the filling plate 241 or filling parts can be removed together when the mold is opened and demolded for easy inspection, cleaning and replacement.

[0074] In this embodiment, due to the structural design of the filler plate 241 being detachably connected to the frame 231 and having a preset gap, and by controlling the length of the protruding end of the first filler 232 to be equal to the gap, the structure of the molding area is accurate and stable, which can effectively control the thickness, contour and geometry of the side wall of the battery pack housing 10, and ensure the consistency and precision of injection molding.

[0075] In some embodiments, in order to enhance the strength of the top plate 110 of the battery pack housing 10 and prevent the battery housing from collapsing due to excessive span, a plurality of rib grooves are provided on the side of the filling plate 241 that is furthest from the pressing edge assembly 220 away from the pressing edge assembly 220.

[0076] In this embodiment, to improve the structural strength of the top plate 110 area of ​​the battery pack housing 10 and prevent local sinking or overall deformation caused by the large span of the top plate 110, the structure of the filling component 240 is optimized in the technical solution. Specifically, on a filling plate 241 away from the pressing component 220, on the side facing away from the pressing component 220, i.e. towards the moving mold, a number of rib grooves are provided to form a reinforcing rib structure.

[0077] The ribs are groove structures, which can be parallel strips, intersecting grids, or arcs, and their arrangement can be optimized according to stress distribution requirements. They are created by CNC machining or wire cutting on the corresponding surface of the filler plate 241, forming raised reinforcing ribs during injection molding. The rib depth is generally 1mm to 3mm, the width is 1mm to 5mm, and the length corresponds to the shape of the battery pack top plate 110; custom designs are available.

[0078] The number and distribution of the rib grooves are determined based on the span and structural dimensions of the shell. The typical distribution is three parallel ribs or cross-shaped ribs to optimize the load-bearing capacity.

[0079] When the mold is closed, the rib grooves, moving mold, and first mold core together define the forming space for the reinforcing ribs. During injection molding, molten plastic fills the cavity under high pressure, simultaneously filling the rib groove area to form a raised rib structure. These ribs will eventually solidify on the inner or outer side of the top plate 110 of the battery pack housing 10 (depending on the mold design), significantly improving structural strength and bending resistance without significantly increasing material usage.

[0080] In particular, since the rib groove is located on the filler plate 241 furthest from the pressing edge assembly 220, its effective area is the central area of ​​the top plate 110 where the stress is weakest and the deformation is most likely. Therefore, this structure can significantly reduce the amount of deformation in the middle and enhance the load-bearing stability of the entire battery pack housing 10.

[0081] In this embodiment, by setting rib grooves on a filler plate 241 in the filler assembly 240 that is far from the pressing edge assembly 220, the structural strength of the top plate 110 of the battery pack housing 10 can be effectively improved without changing the overall mold structure or increasing material consumption, thus avoiding problems such as deformation and collapse of the large-span top plate 110 during molding or use. This technical method is simple in structure, easy to implement, and has good modular scalability and adaptability, making it particularly suitable for scenarios involving flexible production of multiple battery housing models.

[0082] Furthermore, in some embodiments, the pressing element is provided with several detachably connected inserts.

[0083] To enhance the local functionality and replaceability of the edge-pressing component, this embodiment includes several detachably connected inserts. As a crucial component of the edge-pressing assembly 220, the edge-pressing component primarily functions in conjunction with the pad block 210 to form the molding space of the annular skirt structure 140.

[0084] To address the varying requirements of different battery pack housing models 10 regarding skirt shape, size, or local structures, multiple recessed or grooved mounting positions are pre-reserved on the forming surface of the edge clamping component for installing inserts of different shapes and functions. These inserts are preferably made of high-strength, wear-resistant steel (such as Cr12 or SKD11) to enhance compressive strength and wear resistance.

[0085] Each insert is detachably connected to the edge clamping component via screws, locating pins, dovetail grooves, and snap-fit ​​mechanisms, ensuring a secure and reliable structure and facilitating easy installation and removal. The size, contour, and surface treatment of the inserts can be customized to match the design of the battery casing structure.

[0086] During the injection molding process, the blank holder is suspended in the mold groove by the pad 210, and together with the first mold core, the inner wall of the groove and other structures, it defines the forming area of ​​the annular skirt. The detachable insert, as the key forming surface of the blank holder, directly participates in the edge construction of the injection mold cavity. When the molten plastic flows into this area, it cools and solidifies in the area surrounded by the insert, forming a skirt feature with a clear structure and accurate dimensions.

[0087] When switching between different models of battery pack housing 10, it is only necessary to remove the original insert and replace it with a new prefabricated insert to quickly adapt to different structural designs without replacing the entire pressing part or mold core.

[0088] This structure ensures the integrity of the edge clamping function while introducing modular components to enable rapid switching and precise control.

[0089] In this embodiment, a more flexible and expandable edge-forming unit structure is constructed by setting detachable inserts on the edge-pressing component, solving the problems of integral molding of the edge-pressing component 220, difficult maintenance, and fixed structure in traditional molds. This structure can quickly achieve the conversion of various skirt structures 140 by changing the inserts without changing the main body of the edge-pressing component, greatly improving mold adaptability, structural accuracy, and production efficiency.

[0090] In some embodiments, the accessories produced by the supplier often need to be sold to multiple different buyers. Due to branding and other reasons, different buyers often need to set corresponding markings on the battery pack housing 10, such as trademarks. Therefore, in order to accommodate different buyers, the first mold core and the concave mold are detachably connected, and the side of the first mold core away from the concave mold is constructed with a concave-convex structure.

[0091] In order to make the battery pack housing 10 suitable for the customized needs of multiple brand customers or different purchasers, this embodiment has made an adaptability design in the injection mold structure: the first mold core and the cavity mold are detachably connected, and the side of the first mold core away from the cavity mold is provided with a concave and convex structure for directly injection molding logos, trademarks or other graphic information on the surface of the housing.

[0092] The first mold core is a core component mounted on the moving mold cavity, used to form the top plate 110 area of ​​the battery pack housing 10. By designing it as a detachable structure, the first mold core can be connected to the cavity through positioning holes, screws, guide blocks, etc., making it easy to replace according to actual orders.

[0093] The side of the first mold core facing the injection cavity, i.e., the side away from the cavity mold, is formed with one or more sets of raised and recessed structures through etching, CNC engraving, laser processing, etc. These structures correspond to the text, graphics, logos, etc., that need to be presented on the surface of the housing. The raised and recessed structures can be either male molds (protruding to form words) or female molds (recessed to form words), which can be selected according to customer requirements.

[0094] When the mold is in the closed state, the concave and convex structure of the first mold core corresponds to the designated area inside the injection space. After the injection material fills the cavity, a relief or concave shape corresponding to the surface of the mold core is formed at the structure. After cooling and solidification, the target mark is directly formed on the surface of the battery pack housing 10.

[0095] When different customers require different brand logos, model markings, or exclusive codes, operators can quickly replace the first mold core without adjusting the entire moving mold or die structure; product adaptation can be completed simply by replacing the customized marking part.

[0096] This process does not affect the injection cycle time, and the mold core replacement operation is simple and can be completed during equipment downtime maintenance, improving order response speed and customization flexibility.

[0097] In this embodiment, because the first mold core and the concave mold are detachably connected and have a concave-convex structure, the markings on the surface of the battery pack casing 10 can be formed in one mold step, eliminating the need for additional printing or labeling steps, effectively improving production efficiency and marking consistency. This solution is highly flexible; brand markings can be quickly switched simply by changing the mold core. It is particularly suitable for manufacturing models where the same supplier serves multiple brand customers, greatly reducing mold modification costs and production complexity, and enhancing product customization capabilities and market responsiveness. Simultaneously, the in-mold formed markings have excellent scratch resistance, durability, and anti-counterfeiting properties, superior to traditional external labeling methods.

[0098] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. An injection mold for producing a battery pack case, the battery pack case comprising a top plate and a plurality of side plates arranged on the periphery of the top plate and forming a side wall, the plurality of side plates and the top plate enclosing a receiving space, a side of the side wall being provided with a plurality of notches, and an annular skirt structure being arranged at the edge of the side of the side wall away from the top plate, characterized in that, The utility model relates to a battery pack shell injection molding device, including: Movable die, the controlled movement of movable die, movable die includes: Die, the die includes first plane; First die core, set up at first plane; Fixed die, including: Male die, set up parallel with die, male die includes second plane parallel with first plane, second plane sets up opposite to first plane, and male die is provided with recess at second plane; Second die core, second die core sets up in recess, and second die core includes: Several pads, set up in recess inner wall side away from second plane; Edge compression assembly, with pad connection, so that edge compression assembly is suspended relative to recess inner wall through pad; Edge compression assembly is composed of several detachable connection edge compression spare; Side edge assembly, set up in edge compression assembly side away from pad, and side edge assembly is composed of several detachable connection first filling spare; Fill assembly, with side edge assembly connection; Wherein, when movable die and fixed die are in the condition of closing die, melt state injection material is injected into injection molding space for battery pack shell forming which is composed of die, first die core, recess inner wall and second die core, wherein, fill assembly provides first forming space for battery pack shell top plate and side wall through cooperation with pad, edge compression assembly, side edge assembly, recess inner wall and first die core; Edge compression assembly provides second forming space for annular skirt structure through cooperation with recess inner wall, pad and first die core; Side edge assembly provides third forming space for battery pack shell side wall notch through cooperation with recess inner wall, edge compression assembly, fill assembly and first die core.

2. An injection mold according to claim 1, characterized in that Edge compression assembly and side edge assembly are detachable connection.

3. An injection mold according to claim 1, wherein Side edge assembly and edge compression assembly are detachable connection.

4. An injection mold according to claim 1 or 2, characterized in that Side edge assembly includes: Frame, frame is connected with edge compression assembly, and frame includes several installation grooves; Each first filling spare is installed in each installation groove in one-to-one correspondence, and the end of first filling spare towards fill assembly protrudes from the corresponding side of frame, and the protruding end of first filling spare and one end of the corresponding side of frame are defined as protruding end.

5. An injection mold according to claim 4, characterized in that Fill assembly includes several filling plates, and each filling plate is detachably connected with frame, and the connection side of frame and filling plate is the side of frame where the protruding end of first filling spare protrudes, and the side of filling plate towards frame and the side of frame towards filling plate have a preset gap to provide injection molding space for the forming of side wall of battery pack shell.

6. An injection mold according to claim 5, characterized in that The length of the protruding end of the first filling piece protruding from the side of the frame is equal to the preset gap.

7. An injection mold according to claim 5 or 6, characterized in that Several muscle grooves are formed on the side of the filling plate farthest from the edge compression assembly away from the edge compression assembly.

8. An injection mold according to claim 1, wherein The edge compression spare is provided with several detachable connection inserts.

9. An injection mold according to claim 1, wherein The first die core and the die are detachably connected, and the side of the first die core away from the die is configured with a concave-convex structure.

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