Battery cover plate pressing tool for preventing PPS insulating layer from being welded and warped

Abstract

The application belongs to the technical field of new energy battery processing and manufacturing, and specifically discloses a battery cover plate pressing tool for preventing PPS insulation layer from being welded and warped, which comprises a bearing frame, an upper fixing part, a lower fixing part and a driving mechanism. The upper fixing part is arranged at the end of the bearing frame, and comprises an upper fixing plate and at least two upper pressing blocks arranged on the upper fixing plate. The battery cover plate pressing tool for preventing PPS insulation layer from being welded and warped can constrain the insulation layer shape throughout the process even if the welding high temperature is conducted to the PPS insulation layer through the pole post, so as to prevent the edge of the insulation layer from being warped and plastically deformed due to heat, ensure that the insulation layer is closely attached to the cover plate substrate, eliminate the micro gap hidden danger, comprehensively improve the sealing performance and appearance quality of the battery cover plate, and effectively solve the technical problems in the existing welding process.

Description

Technical Field

[0001] This invention relates to the field of new energy battery processing and manufacturing technology, and in particular to a battery cover clamping fixture for preventing PPS insulation layer welding from warping. Background Technology

[0002] In the production of new energy battery covers, laser welding of the electrode post and the pressure plate is a crucial process to ensure the reliability of electrical connections and structural integrity. With the advancement of mass production, a problem caused by the heat effect of welding has been discovered in the actual process: the high temperature generated during laser welding is conducted through the electrode post to the surrounding PPS insulation layer, causing the edges of the insulation layer to soften and warp instantly during welding. This warping occurs temporarily during the welding process. Although it partially recovers after cooling, it has already caused irreversible plastic deformation, resulting in microscopic gaps between the insulation layer and the substrate, thus affecting the sealing performance and appearance quality of the battery cover. Therefore, how to effectively suppress the heat-induced warping of the insulation layer during welding has become a pressing practical problem to be solved in this field.

[0003] Existing technologies mainly focus on improving the product structure of battery cover plates. For example, Chinese invention patent CN114447413A discloses a battery cover plate, which includes a cover body with terminals, a welding ring fitted around the edge of the terminals, and an insulating ring fitted at the connection between the welding ring and the terminals. It should be noted that this patent is a product structure patent; the welding ring and insulating ring are permanent components of the battery cover plate, aiming to achieve structural fixation and electrical isolation after assembly. However, it does not solve the problem of temporary thermal deformation of the insulation layer during the welding process.

[0004] Chinese invention patent CN116666848A discloses a novel battery cover structure for terminal welding, comprising a substrate, two insulating plates, two pressure plates, a positive terminal post, a negative terminal post, and two sealing rings. The substrate has positive and negative through holes. The two insulating plates are respectively installed within the positive and negative through holes, and each insulating plate has a pressure plate through hole. This cover structure solves the problems of complex assembly processes, reduced production efficiency, and insufficient or excessive compression of the sealing rings during assembly in existing battery cover structures. In this design, the top block is only designed as a planar structure, used only to press the terminal post itself, and does not provide any constraint or protection for the insulating layer during the welding process.

[0005] In other words, existing technologies lack effective solutions for the problem of PPS insulation layer warping due to heat during laser welding. Neither permanent structural components nor optimized sealing ring compression designs address the temporary limiting or thermal protection of the insulation layer edge during welding. This means that the heat-affected zone during welding can still cause irreversible deformation of the insulation layer, thus affecting the product's sealing reliability and appearance consistency.

[0006] In summary, the existing cover plate welding process suffers from the problem of PPS insulation layer warping due to heat caused by the lack of insulation layer constraint. Summary of the Invention

[0007] This invention provides a battery cover clamping fixture to prevent PPS insulation layer from warping during welding, which can solve the problem of PPS insulation layer warping due to heat during welding in the prior art due to the lack of insulation layer constraint.

[0008] A battery cover clamping fixture for preventing PPS insulation layer welding warping includes: Support frame; An upper fixing member is provided at the end of the support frame, and the upper fixing member includes an upper fixing plate and at least two upper pressure blocks provided on the upper fixing plate; The lower fixing member is movably disposed within the support frame. The lower fixing member includes a support assembly and a top block disposed on the support assembly. The support assembly is used to support the battery cover, and the position of the top block corresponds to the insulating layer on the battery cover. A drive mechanism is located on the support frame at one end away from the upper fixing member. The drive mechanism is used to drive the support assembly to move toward the upper fixing member so that the battery cover is pressed between the upper fixing plate and the support assembly. The upper pressure block is positioned corresponding to the terminal post on the battery cover, and the top block is used to abut against and press the insulating layer on the battery cover in a pressed state.

[0009] This invention provides a battery cover clamping fixture to prevent PPS insulation layer welding from warping, which has the following advantages compared to the prior art: In this battery cover clamping fixture designed to prevent PPS insulation layer welding from warping, the support frame serves as the fundamental support component, undertaking the installation, positioning, and load-bearing functions of each functional component, ensuring the overall structural stability of the fixture. The upper fixing component is fixedly mounted at the top of the support frame, serving as the upper clamping reference component of the fixture. It requires no displacement adjustment, ensuring precise clamping position. The upper fixing component includes an upper fixing plate and at least two upper pressure blocks mounted on the upper fixing plate. The upper fixing plate can withstand the reverse force during the clamping process, preventing deformation that could affect the clamping effect. The upper pressure blocks and the upper fixing plate can be detachably fixed, facilitating subsequent maintenance, replacement, and adjustment to accommodate battery cover covers of different specifications. The setting of at least two upper pressure blocks can adapt to the structural layout of the bipolar posts on the battery cover, and the installation position of the upper pressure blocks corresponds one-to-one with the position of the posts on the battery cover. When the tooling is clamped, the upper pressure blocks can directly press against the outer edge of the posts on the battery cover to precisely limit the posts and prevent them from shifting or shaking during laser welding, ensuring the welding position accuracy of the posts. At the same time, it works with the lower components to achieve the initial fixation of the battery cover as a whole.

[0010] The lower fixing component is vertically movable inside the support frame, serving as the lower support and clamping part of the tooling. It works in conjunction with the upper fixing component to clamp and press the battery cover. The lower fixing component includes a support assembly and a top block mounted on the support assembly. The support assembly, as the direct support component for the battery cover, is used to stably place and position the battery cover to be welded, ensuring accurate placement of each component of the battery cover and precise alignment with the upper pressure block and top block to avoid misalignment during clamping. The top block is mounted on the support assembly, and its installation position corresponds exactly to the position of the PPS insulation layer on the battery cover, ensuring that the top block can accurately act on the insulation layer area for targeted clamping and protection.

[0011] The drive mechanism is installed on the bottom of the support frame away from the upper fixed part. As the power output component of the tooling, it provides stable power for the movement of the lower fixed part. It drives the entire support assembly to move in a directional linear motion along the support frame towards the upper fixed part, thereby driving the battery cover to gradually move closer to the upper fixed plate. Finally, the battery cover is stably pressed between the upper fixed plate and the support assembly, completing the clamping action of the tooling.

[0012] This invention provides a battery cover clamping fixture to prevent PPS insulation layer from warping during welding. During laser welding of the electrode post, even if the high temperature of welding is conducted to the PPS insulation layer through the electrode post, causing the insulation layer to soften, the top block can still constrain the shape of the insulation layer throughout the process, preventing the insulation layer edge from warping due to heat and causing plastic deformation. This ensures that the insulation layer is tightly bonded to the cover plate substrate, eliminates the hidden dangers of micro-gaps, and comprehensively improves the sealing performance and appearance quality of the battery cover, thereby effectively solving the technical problems in the existing welding process.

[0013] Furthermore, the top block includes a support portion and an abutment portion disposed on the support portion; The side of the support portion away from the contact portion is located inside the load-bearing component; On the side of the abutment portion away from the support portion, a limiting groove adapted to the insulating layer is provided.

[0014] Furthermore, the supporting component includes an intermediate movable block and a material feeding tray disposed on the intermediate movable block; The material feeding tray has a bearing groove adapted to the top block, and the top block is partially accommodated in the bearing groove.

[0015] Furthermore, the intermediate movable block is also provided with at least two pallet limiting blocks, which are used to limit the material feeding pallet.

[0016] Furthermore, the tray limiting block has an L-shaped structure.

[0017] Furthermore, at least one compression limiting block is provided at the top edge of the intermediate movable block.

[0018] Furthermore, the support frame includes a lower fixed plate and a plurality of support columns disposed on the lower fixed plate; The upper fixing member is located on the support column at the end away from the lower fixing plate; The lower fixing member is slidably mounted on the supporting column; The drive mechanism is mounted on the lower fixed plate.

[0019] Furthermore, at least two drive mechanisms are provided and arranged symmetrically.

[0020] Furthermore, the driving mechanism is a cylinder or a hydraulic push rod.

[0021] Furthermore, one side of the upper fixing plate is provided with an installation groove that matches the upper pressure block, and the other side of the upper fixing plate is provided with a through hole that communicates with the installation groove. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A schematic diagram of a battery cover clamping fixture for preventing PPS insulation layer welding warping and the installation structure of the battery cover provided by the present invention. Figure 2 A front view of a battery cover clamping fixture and battery cover mounting structure for preventing PPS insulation layer welding warping provided by the present invention; Figure 3 A schematic diagram of a battery cover clamping fixture for preventing PPS insulation layer welding from warping, provided by the present invention; Figure 4 A schematic diagram of the top block of a battery cover clamping fixture for preventing PPS insulation layer welding from warping, provided by the present invention; Figure 5 A schematic diagram of the material feeding tray of a battery cover clamping fixture for preventing PPS insulation layer welding from warping, provided by the present invention; Figure 6 The bottom view of the upper fixing plate of the battery cover clamping fixture for preventing PPS insulation layer welding warping provided by the present invention; Figure 7 A schematic diagram of the battery cover plate structure of a battery cover plate clamping fixture for preventing PPS insulation layer welding warping provided by the present invention; Figure 8 The main structural view of the battery cover plate of the battery cover plate clamping fixture for preventing PPS insulation layer welding warping provided by the present invention; Figure 9 Provided by the present invention Figure 8 Enlarged view of the structure at point A in the image.

[0023] Explanation of reference numerals in the attached figures: 1. Upper fixing plate; 2. Upper pressure block; 6. Material discharge tray; 7. Top block; 701. Support part; 702. Abutment part; 703. Limiting groove; 101. Installation groove; 102. Perforation; 11. Middle movable block; 111. Tray limiting block; 112. Compression limiting block; 12. Support column; 13. Lower fixing plate; 601. Bearing groove; 100. Battery cover plate; 200. Terminal post; 300. Insulation layer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. 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 indicated technical features. Thus, a feature defined with "first" or "second" 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.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., 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 invention 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 invention.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0029] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, B and / or C can represent: B existing alone, B and C existing simultaneously, or C existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] like Figures 1 to 5 As shown in the figure, the battery cover clamping fixture for preventing PPS insulation layer welding warping provided by the embodiment of the present invention includes a support frame, an upper fixing part, a lower fixing part and a drive mechanism. The components cooperate with each other to form an upper and lower clamping fixture structure. The overall structure is simple and easy to assemble. It is suitable for automated welding production lines for mass production, and has strong operational stability and high clamping accuracy.

[0031] Specifically, the upper fixing member is located at the end of the support frame, and the upper fixing member includes an upper fixing plate 1 and at least two upper pressure blocks 2 disposed on the upper fixing plate 1; The lower fixing member is movably disposed within the support frame. The lower fixing member includes a support assembly and a top block 7 disposed on the support assembly. The support assembly is used to support the battery cover plate. The position of the top block 7 corresponds to the insulating layer 300 on the battery cover plate 100. The insulating layer 300 is a PPS insulating layer.

[0032] The drive mechanism is located at one end of the support frame away from the upper fixing member. The drive mechanism is used to drive the support assembly to move in the direction of the upper fixing member so that the battery cover is pressed between the upper fixing plate 1 and the support assembly. The upper pressure block 2 is positioned corresponding to the terminal post on the battery cover, and the top block 7 is used to abut against and press the insulating layer on the battery cover in a pressed state.

[0033] In practical applications, the support frame serves as the basic support component of the entire tooling, undertaking the installation, positioning, and load-bearing functions of various functional components. It ensures the overall stability of the tooling structure and prevents shaking or displacement during the clamping process. It provides a stable working platform for the battery cover welding operation and provides guiding support for the directional movement of the lower fixing component, ensuring precise alignment of the upper and lower clamping actions.

[0034] The upper fixing component is fixedly installed at the top of the support frame, serving as the upper clamping reference component of the tooling. It requires no displacement adjustment, ensuring the accuracy of the clamping position. The upper fixing component includes an upper fixing plate 1 and at least two upper pressure blocks 2 mounted on the upper fixing plate 1. The upper fixing plate 1 can withstand the reverse force during the clamping process, preventing deformation that could affect the clamping effect. The upper pressure blocks 2 and the upper fixing plate 1 can be detachably fixed, facilitating subsequent maintenance, replacement, and adjustment to accommodate different battery cover specifications. The at least two upper pressure blocks 2 can accommodate the bipolar post structure on the battery cover, and the installation position of the upper pressure blocks 2 corresponds one-to-one with the position of the posts on the battery cover. In the clamping state, the upper pressure blocks 2 can directly press against the outer edge of the posts 200 on the battery cover 100, precisely limiting the position of the posts 200 and preventing them from shifting or shaking during laser welding, ensuring the welding position accuracy of the posts. Simultaneously, it works with the lower component to achieve initial fixation of the entire battery cover.

[0035] The lower fixing component is vertically movable inside the support frame, serving as the lower support and clamping component of the tooling. It works in conjunction with the upper fixing component to clamp and press the battery cover 100. The lower fixing component includes a support assembly and a top block 7 mounted on the support assembly. The support assembly, as the direct support component of the battery cover 100, is used to stably place and position the battery cover 100 to be welded, ensuring accurate placement of each component of the battery cover 100 and precise alignment with the upper pressure block 2 and the top block 7, avoiding misalignment during clamping. The top block 7 is mounted on the support assembly, and its mounting position corresponds perfectly to the position of the PPS insulation layer on the battery cover, ensuring that the top block 7 can accurately act on the insulation layer area to achieve targeted clamping protection.

[0036] The drive mechanism is installed at the bottom of the support frame away from the upper fixed component. As the power output component of the tooling, it provides stable power for the movement of the lower fixed component. The drive mechanism drives the entire support assembly to move linearly along the support frame towards the upper fixed component, thereby gradually moving the battery cover 1 closer to the upper fixed plate 1. Ultimately, the battery cover 100 is stably pressed between the upper fixed plate 1 and the support assembly, completing the clamping action of the tooling. This drive mechanism provides stable power output and controllable stroke, ensuring uniform clamping force and avoiding the problems of excessive pressure damaging the battery cover or insufficient pressure failing to provide clamping protection. After clamping, the battery cover can be laser-welded. After welding, the drive mechanism drives the entire support assembly to move linearly along the support frame away from the upper fixed component, thereby gradually moving the battery cover 100 away from the upper fixed plate 1, ultimately detaching the battery cover 100 from the upper fixed plate 1, completing the welding.

[0037] In actual operation, this fixture utilizes the partitioned clamping design of the upper pressure block 2 and the top block 7 to achieve synchronous protection of the terminal post and the insulation layer: the upper pressure block 2 precisely corresponds to the position of the terminal post 200, completing the clamping and limiting of the edge of the terminal post 200; when the fixture is in a fully clamped state, the top block 7 can tightly abut against and firmly press the PPS insulation layer 300 on the battery cover plate 100, forming a comprehensive rigid constraint on the edge of the insulation layer 300. During laser welding of the terminal post 200, even if the high temperature of welding is conducted through the terminal post to the PPS insulation layer, causing the insulation layer to soften, the top block 7 can still constrain the shape of the insulation layer throughout the process, preventing the insulation layer edge from warping due to heat and causing plastic deformation, ensuring that the insulation layer and the cover plate substrate are tightly bonded, eliminating the hidden dangers of micro-gaps, and comprehensively improving the sealing performance and appearance quality of the battery cover plate, thereby effectively solving the technical problems in the existing welding process.

[0038] like Figures 1 to 5 As shown, in some embodiments of the present invention, the top block 7 includes a support portion 701 and an abutment portion 702 disposed on the support portion 701. The side of the support portion 701 away from the abutment portion 702 is located inside the bearing assembly; the side of the abutment portion 702 away from the support portion 701 is provided with a limiting groove 703 adapted to the insulating layer.

[0039] Specifically, the top block 7 adopts an integrated structure of support part 701 and abutment part 702, which has sufficient structural strength and rigidity to withstand the force during the pressing process. It also has a certain degree of heat resistance to avoid deformation under the influence of welding heat radiation and ensure stable pressing and constraint effect on the insulation layer.

[0040] Among them, the support part 701 serves as the installation support base for the top block 7. Its side away from the abutment part 702 is embedded and fixed inside the bearing component. This installation method can improve the installation stability of the top block 7, prevent the top block 7 from shifting or shaking during the pressing operation, ensure the alignment accuracy between the top block 7 and the insulation layer, and enhance the load-bearing capacity of the top block 7 to avoid damage to the top block 7 due to uneven force.

[0041] In detail, the abutment portion 702, as the direct contact component between the top block 7 and the PPS insulation layer, is sized to match the shape of the insulation layer, enabling full coverage abutment and ensuring uniform compression force on all areas of the insulation layer. The limiting groove 703 on the abutment portion 702 matches the shape and size of the PPS insulation layer on the battery cover, allowing the insulation layer to be embedded into the groove under compression, forming a wrap-around limiting constraint.

[0042] In this design, the contact area between the contact part 702 and the insulating layer is larger, and the clamping force is more uniform, which further enhances the constraint effect on the thermal deformation of the insulating layer, ensuring that the insulating layer and the cover plate substrate are tightly bonded. This optimizes the protective performance of the tooling from the details and ensures the stability and consistency of the welding quality of the battery cover plate.

[0043] like Figures 1 to 5 As shown, in some embodiments of the present invention, the supporting component includes an intermediate movable block 11 and a feeding tray 6 disposed on the intermediate movable block 11; The material tray 6 has a bearing groove 601 that is adapted to the top block 7, and the top block 7 is partially accommodated in the bearing groove 601.

[0044] Specifically, the supporting component adopts a combined structure of a central movable block 11 and a feeding tray 6, which are detachably and fixedly connected for easy subsequent maintenance, cleaning, and component replacement, adapting to the production needs of battery cover plates of different specifications. The central movable block 11 is connected to the drive mechanism, enabling it to move directionally along the supporting frame under the drive of the mechanism. It also provides a stable mounting support surface for the feeding tray 6, ensuring that the feeding tray 6 does not shift or shake during movement and pressing, thus ensuring the load-bearing stability of the battery cover plate. The feeding tray 6, used to support the battery cover plate, is shaped to fit the battery cover plate, providing initial positioning and preventing misalignment during placement. This ensures that the terminals and insulating layer on the battery cover plate are precisely aligned with the upper pressure block 2 and the top block 7, respectively.

[0045] Furthermore, the bearing groove 601 on the material tray 6 is shaped and sized to match the shape of the top block 7. The top block 7 is partially embedded and accommodated within the bearing groove 601, achieving positioning and installation of the top block 7, preventing displacement of the top block 7 on the bearing assembly, and ensuring the alignment accuracy of the top block 7 with the insulation layer on the battery cover. At the same time, the bearing groove 601 also provides limiting protection for the top block 7, preventing it from tilting or being damaged due to uneven force during the pressing operation, thus extending the service life of the top block 7.

[0046] like Figures 1 to 5 As shown, in some embodiments of the present invention, at least two pallet limiting blocks 111 are also provided on the intermediate movable block 11, which are used to limit the material feeding pallet 6.

[0047] Specifically, the pallet limiting block 111 is made of rigid material and is detachably fixedly connected to the intermediate movable block 11 to ensure that it is firmly installed and not easily loosened, and can withstand the lateral forces generated during the placement of the material tray 6 and the clamping of the tooling. At least two pallet limiting blocks 111 can be symmetrically arranged on the top surface of the intermediate movable block 11, around the edge of the material tray 6. Their arrangement is adapted to the shape of the material tray 6, and can limit and constrain the material tray 6 from both sides or four corners to form a stable limiting structure. The height of the pallet limiting block 111 is slightly lower than the height of the material tray 6, which can achieve precise limiting of the material tray 6 without interfering with the load-bearing capacity of the material tray 6 on the battery cover, and without affecting the clamping and docking of the battery cover with the upper fixing component.

[0048] During tooling operation, when the drive mechanism moves the intermediate movable block 11, the material feeding tray 6 will be subjected to inertial force. The tray limiting block 111 can form a lateral block to prevent the material feeding tray 6 from sliding. During the placement, pressing and welding of the battery cover, the tray limiting block 111 can constrain the position of the material feeding tray 6 to prevent it from tilting due to uneven force, ensuring that the pressing position of the top block 7 on the PPS insulation layer is accurate, and at the same time ensuring the alignment accuracy of the electrode post and the upper pressing block 2, avoiding problems such as welding misalignment and inadequate pressing of the insulation layer caused by the offset of the material feeding tray 6.

[0049] like Figures 1 to 5 As shown, in some embodiments of the present invention, the tray limiting block 111 has an L-shaped structure.

[0050] Specifically, the L-shaped pallet limiting block 111 consists of two mutually perpendicular limiting edges, which are integrally formed, resulting in a rigid and uniformly stressed structure capable of withstanding the lateral extrusion force from the feeding pallet 6 and is not prone to deformation or damage. The L-shaped pallet limiting block 111 fits against the corners of the feeding pallet 6, providing bidirectional limiting constraints on the corners of the feeding pallet 6.

[0051] At least two pallet limiting blocks 111 are provided, which can constrain at least two corners of the material feeding pallet 6 to achieve precise positioning of the material feeding pallet 6.

[0052] like Figures 1 to 5 As shown, in some embodiments of the present invention, at least one compression limiting block 112 is provided at the top edge of the intermediate movable block 11, and the compression limiting block 112 is used to limit the pressing stroke of the top block 7.

[0053] The compression limiting block 112 is made of high-strength rigid material and is detachably fixedly connected to the intermediate movable block 11. It can withstand the impact and pressure generated during the tooling clamping process and is not prone to deformation, loosening, or damage. At least one compression limiting block 112 is symmetrically arranged at the top edge of the intermediate movable block 11, avoiding the installation positions of the top block 7, the discharge tray 6, and the tray limiting block 111. This ensures that it does not interfere with the normal installation and operation of each component while accurately performing its limiting function. The height difference between the top surface of the compression limiting block 112 and the top surface of the top block 7 is the maximum allowable clamping stroke of the top block 7, adapting to the clamping requirements of battery cover plates and PPS insulation layers of different thicknesses.

[0054] The compression limit block 112 is used to limit the clamping stroke of the top block 7 to prevent excessive pressure or uncontrolled stroke during the clamping process, which could lead to the top block 7 excessively clamping the PPS insulation layer, damaging the insulation layer or the battery cover.

[0055] Specifically, when the drive mechanism moves the intermediate movable block 11 upward, thereby causing the top block 7 to press against the PPS insulation layer on the battery cover, after the top block 7 completes the preset pressing stroke and achieves the optimal pressing effect, the top surface of the compression limiting block 112 will tightly abut against the bottom surface of the upper fixed plate 1, forming a rigid block to prevent the intermediate movable block 11 from continuing to move upward, thereby limiting the top block 7 from continuing to press, ensuring that the pressing force and pressing stroke of the top block 7 on the insulation layer are within a reasonable range. This structural design is based on the physical characteristics of the PPS insulation layer and the welding process requirements of the battery cover. It avoids the problems of insufficient pressing force leading to weak insulation layer constraint and easy lifting during welding, and also prevents damage such as insulation layer breakage, deformation, or battery cover substrate dent caused by excessive pressing, thus ensuring the product integrity of the battery cover.

[0056] like Figures 1 to 5 As shown, in some embodiments of the present invention, the support frame includes a lower fixed plate 13 and a plurality of support columns 12 disposed on the lower fixed plate 13; The upper fixing member is located on the support column 12 at the end away from the lower fixing plate 13; The lower fixing member is slidably mounted on the support column 12; The drive mechanism is located on the lower fixed plate 13.

[0057] Specifically, the support frame adopts a combination structure of a lower fixed plate 13 and several supporting columns 12. The two are integrally molded or fixedly connected by high-strength bolts to ensure that the overall structure of the support frame is stable and has sufficient rigidity, capable of withstanding various forces generated during the tooling clamping operation, avoiding overall deformation and shaking, and providing a reliable foundation for the stable operation of the entire tooling. Among them, the lower fixed plate 13, as the bottom support component of the support frame, has a flat plate structure with sufficient bearing area and structural strength, and can be placed stably at the welding station. At the same time, it provides a stable mounting carrier for the drive mechanism, ensuring that the drive mechanism is firmly installed and operates stably, and preventing the drive mechanism from shifting during operation.

[0058] Several support columns 12 are arranged on the top surface of the lower fixing plate 13, wherein preferably there are four support columns 12, which are respectively located at the four corners of the top surface of the lower fixing plate 13. The support columns 12 can be made of high-strength rigid material, and their height is adapted to the overall design dimensions of the tooling, so as to accurately support the upper fixing component and ensure that the upper fixing component is in a horizontal state, providing a stable upper reference for the clamping operation.

[0059] The upper fixing component is fixedly mounted on the top of the support column 12, ensuring the alignment of the upper and lower fixing components through the support of the support column 12. The lower fixing component is slidably sleeved on the support column 12, which also serves as a guide, ensuring that the lower fixing component moves vertically along the support column 12 under the drive mechanism, preventing offset or tilting during movement, and further ensuring the alignment accuracy of the top block 7 and the upper pressure block 2, ensuring precise pressing of the PPS insulation layer and the pole. The drive mechanism is fixedly mounted on the lower fixing plate 13 and correspondingly connected to the middle movable block 11 of the lower fixing component. This installation method allows the power output of the drive mechanism to directly act on the lower fixing component, reducing power loss, ensuring accurate and stable power transmission, and facilitating the installation, inspection, and maintenance of the drive mechanism.

[0060] like Figures 1 to 5 As shown, in some embodiments of the present invention, at least two drive mechanisms are provided and arranged symmetrically.

[0061] The drive mechanism adopts a symmetrical arrangement of at least two drive mechanisms, all with identical specifications and models, and is mounted on the lower fixed plate 13. They are evenly distributed with the central axis of the intermediate movable block 11 as the center of symmetry. Each drive mechanism is connected to the intermediate movable block 11 to achieve synchronous power output. The power parameters and stroke control of each drive mechanism are consistent, ensuring the synchronicity and stability of power output and preventing excessive stress or damage to any single drive mechanism. The symmetrical arrangement avoids the installation position of the support column 12, thus not interfering with the guiding function of the support column 12 or affecting the normal movement of the lower fixed component, while also facilitating independent inspection and maintenance of each drive mechanism.

[0062] like Figures 1 to 5 As shown, in some embodiments of the present invention, the driving mechanism is a cylinder or a hydraulic push rod.

[0063] The drive mechanism uses either a cylinder or a hydraulic push rod, both of which are linear drive components. They feature stable power output, controllable stroke, fast response, and convenient operation, making them fully compatible with the operational requirements of battery cover clamping fixtures. The appropriate cylinder can be flexibly selected based on the actual production scenario and clamping force requirements. The cylinder is suitable for production scenarios with moderate clamping force requirements and no high-pressure oil contamination in the working environment. Its piston rod is connected to the intermediate movable block 11, enabling rapid extension and retraction to drive the lower fixed component to complete the clamping and resetting actions. The hydraulic push rod uses hydraulic oil as its power source, offering advantages such as high output pressure, strong load capacity, and stable operation. It is suitable for batch production scenarios with high clamping force requirements and the need for long-term stable operation. Its push rod end is connected to the intermediate movable block 11, allowing control of the extension and retraction stroke to ensure uniform and stable clamping force.

[0064] like Figures 1 to 6 As shown, in some embodiments of the present invention, one side of the upper fixing plate 1 is provided with an installation groove 101 adapted to the upper pressure block 2, and the other side of the upper fixing plate 1 is provided with a through hole 102 communicating with the installation groove 101.

[0065] Specifically, the mounting groove 101 and the through hole 102 on the upper fixing plate 1 are integrally formed, and the mounting groove 101 is adapted to the structure of the upper pressure block 2, ensuring that the upper pressure block 2 can be accurately embedded in the mounting groove 101 for stable installation. The mounting groove 101 is located on the side of the upper fixing plate 1 facing the battery cover, and its depth matches the height of the upper pressure block 2. This allows the top surface of the upper pressure block 2 to slightly protrude from this side of the upper fixing plate 1 after embedding, which does not affect the pressing effect of the upper pressure block 2 on the terminal post, but also provides lateral restraint to prevent the upper pressure block 2 from shifting during the pressing process. The through holes 102 are located on the other side of the upper fixing plate 1 away from the battery cover, and their number and position correspond one-to-one with the mounting grooves 101, facilitating laser welding of the terminal post through the through holes 102.

[0066] The technical solution of the present invention will be further explained and illustrated below through a specific example.

[0067] like Figures 1 to 9 As shown, this example uses a new energy square battery cover plate as the welding object. The battery cover plate 100 has two terminals 200 (positive terminal and negative terminal). The terminals 200 are surrounded by a PPS insulation layer 300. The terminals 200 and the cover plate substrate need to be laser welded, and the PPS insulation layer 300 must be prevented from warping due to heat during the welding process to ensure the sealing performance and appearance quality of the cover plate after welding.

[0068] The specific configuration of the clamping fixture adapted to the battery cover is as follows: The support frame is composed of a lower fixed plate 13 and four support columns 12. The four support columns 12 are symmetrically arranged at the four corners of the lower fixed plate 13 and can be fixed to the lower fixed plate 13 with high-strength bolts; the upper fixed plate 1 of the upper fixing member is fixed to the top of the four support columns 12. The upper fixed plate 1 has two mounting grooves 101 that are adapted to the upper pressure block 2 on one side facing the battery cover, and two corresponding through holes 102 are opened on the other side. The two upper pressure blocks 2 are fixed in the mounting grooves 101, and the position of the upper pressure block 2 is precisely corresponding to the two pole posts 200 on the battery cover 100. In the lower fixing component, the middle movable block 11 is slidably fitted onto the four supporting columns 12. A material discharge tray 6 is installed at the top of the middle movable block 11. The material discharge tray 6 has two bearing grooves 601 that are adapted to the top blocks 7. The two top blocks 7 are partially accommodated in the bearing grooves 601. The abutment part 702 of the top blocks 7 has a limiting groove 703 that is adapted to the PPS insulation layer 300. The top of the middle movable block 11 has four L-shaped tray limiting blocks 111, which are symmetrically arranged at the four corners of the material discharge tray 6 to limit the material discharge tray 6 in both directions. The top edge of the middle movable block 11 has two compression limiting blocks 112, whose height is set to the preset pressing stroke between the top surface of the top block 7 and the bottom surface of the upper fixing plate 1. The drive mechanism uses two cylinders of the same specification, which are symmetrically arranged on the lower fixing plate 13. The cylinder piston rod is fixedly connected to the middle movable block 11 to achieve synchronous power output.

[0069] The specific operating procedure is as follows: First, the operator places the battery cover to be welded stably on the feeding tray 6, ensuring that the terminal post on the battery cover is aligned with the upper pressure block 2 and the PPS insulation layer 300 is aligned with the limiting groove 703 of the top block 7. At this time, the L-shaped tray limiting block 111 limits the feeding tray 6 to prevent the feeding tray 6 from shifting and causing alignment deviation. Then, the production line automation control system is started, controlling the two symmetrically arranged cylinders to start synchronously. The cylinder piston rods extend upward, driving the middle movable block 11 to move vertically upward along the support column 12, thereby driving the feeding tray. 6. The battery cover and top block 7 move upward together; as the cylinder continues to advance, the limiting groove 703 of the top block 7 first fits against the PPS insulation layer on the battery cover, and the upper pressure block 2 contacts the outer edge of the terminal on the battery cover. It continues to advance until the top surface of the compression limiting block 112 is tightly against the bottom surface of the upper fixed plate 1. The cylinder stops advancing. At this time, the tooling completes the clamping action. The battery cover is stably pressed between the upper fixed plate 1 and the discharge tray 6. The top block 7 forms a wrapping clamping on the PPS insulation layer through the limiting groove 703, and the upper pressure block 2 forms a precise clamping limit on the terminal.

[0070] The laser welding equipment is started to perform laser welding on the electrode post and the cover plate substrate. During the welding process, the high temperature generated by the laser is conducted to the surrounding PPS insulation layer through the electrode post, causing the insulation layer to soften. Since the limiting groove 703 of the top block 7 always forms a rigid constraint on the PPS insulation layer, and the clamping force is within the reasonable range limited by the compression limiting block 112, the insulation layer cannot have the phenomenon of edge lifting or outward turning, effectively avoiding the generation of irreversible plastic deformation. At the same time, the upper pressure block 2 clamps and limits the electrode post to prevent the electrode post from shifting during welding, ensuring the welding position accuracy. The L-shaped tray limiting block 111 and the support column 12 respectively ensure that the material feeding tray 6 and the middle movable block 11 do not shift, further ensuring the clamping and protection effect. After welding is completed, the top block 7 remains pressed until it cools down. The insulating layer 300 is shaped under constraint. Then, the cylinder piston rod is controlled to retract, which drives the middle movable block 11 and the material tray 6 to return to their original position. The operator takes out the welded battery cover plate, completing a single welding operation. The above process can be repeated to achieve batch welding of battery cover plates.

[0071] In this example, after using the clamping fixture of the present invention, the welding warping rate of the PPS insulation layer was reduced from more than 60% to less than 0.5%, there were no microscopic gaps between the insulation layer and the substrate, and the sealing performance and appearance quality of the battery cover were significantly improved.

[0072] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A battery cover clamping fixture for preventing PPS insulation layer welding warping, characterized in that, include: Support frame; An upper fixing member is provided at the end of the support frame. The upper fixing member includes an upper fixing plate (1) and at least two upper pressure blocks (2) provided on the upper fixing plate (1). The lower fixing member is movably disposed in the support frame. The lower fixing member includes a support component and a top block (7) disposed on the support component. The support component is used to support the battery cover plate. The position of the top block (7) corresponds to the insulating layer on the battery cover plate. A drive mechanism is located on the support frame at one end away from the upper fixing member. The drive mechanism is used to drive the support assembly to move in the direction of the upper fixing member so that the battery cover is pressed between the upper fixing plate (1) and the support assembly. The upper pressure block (2) is positioned corresponding to the terminal post on the battery cover, and the top block (7) is used to abut against and press the insulating layer on the battery cover in a pressed state.

2. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 1, characterized in that, The top block (7) includes a support part (701) and an abutment part (702) provided on the support part (701). The side of the support (701) away from the abutment (702) is located inside the bearing assembly; On the side of the contact portion (702) away from the support portion (701), a limiting groove (703) adapted to the insulating layer is provided.

3. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 1, characterized in that, The supporting component includes an intermediate movable block (11) and a material feeding tray (6) disposed on the intermediate movable block (11). The material tray (6) is provided with a bearing groove (601) that is adapted to the top block (7), and the top block (7) is partially accommodated in the bearing groove (601).

4. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 3, characterized in that, The intermediate movable block (11) is also provided with at least two pallet limiting blocks (111), which are used to limit the material feeding pallet (6).

5. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 4, characterized in that, The tray limiting block (111) has an L-shaped structure.

6. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 3, characterized in that, At least one compression limiting block (112) is provided at the top edge of the intermediate movable block (11).

7. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 1, characterized in that, The support frame includes a lower fixed plate (13) and a plurality of support columns (12) disposed on the lower fixed plate (13). The upper fixing member is located on the support column (12) at one end away from the lower fixing plate (13); The lower fixing member is slidably mounted on the supporting column (12); The drive mechanism is located on the lower fixed plate (13).

8. The battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 1, characterized in that, The drive mechanism is provided in at least two parts and is arranged symmetrically.

9. A battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 8, characterized in that, The drive mechanism is a cylinder or a hydraulic push rod.

10. A battery cover clamping fixture for preventing PPS insulation layer welding warping according to claim 1, characterized in that, The upper fixing plate (1) has an installation groove (101) on one side that is compatible with the upper pressure block (2), and the upper fixing plate (1) has a through hole (102) on the other side that is connected to the installation groove (101).

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