Limiting device and welding fixture

Abstract

This application relates to the field of battery manufacturing technology and discloses a limiting device and welding fixture. The limiting device includes a base, multiple limiting components, and a detachable connecting structure. The base is provided with a discrete positioning structure, which includes multiple positioning units. The limiting components are detachably installed on the base and selectively connected to different positioning units through the detachable connecting structure, thereby forming a limiting area with adjustable spacing on the base to accommodate adapter pieces of different sizes. Based on this limiting device, the welding fixture further includes an operating table with multiple receiving positions for accommodating the core and the adapter piece, respectively. The limiting structure provides stable support for the adapter piece and the core, ensuring accurate welding position. This application has a simple structure, flexible adjustment, and can improve welding accuracy and adapt to various specifications of lithium battery products, possessing good process compatibility and promotional value.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and further to a limiting device and welding fixture. Background Technology

[0002] In current lithium battery welding processes, the limiting structure of the adapter piece is usually a fixed design, which cannot accommodate adapter pieces of different sizes or shapes. When the width, edge length, etc. of the adapter piece change, the entire tooling needs to be replaced to complete the positioning, resulting in cumbersome operation and low efficiency. Especially when multiple adapter pieces are used alternately in the production process, the adaptability of the fixed structure is obviously insufficient and it is difficult to meet the actual needs. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a limiting device and welding fixture that enables rapid positioning and stable limiting of adapter pieces of different sizes, thereby helping to reduce production costs.

[0004] To achieve the above objectives, this application provides a limiting device for positioning adapter pieces during lithium battery production, comprising:

[0005] A base, wherein the base is provided with a discrete positioning structure, the positioning structure comprising multiple positioning units;

[0006] At least two limiting members are detachably mounted on the base;

[0007] A detachable connection structure is provided between the limiting member and the base, so that the limiting member can be selectively connected to different positioning units, thereby forming an adjustable-spacing limiting area on the base for adapting to adapter pieces of different sizes.

[0008] In some embodiments, multiple positioning units are evenly arranged in the longitudinal and transverse directions on the main mounting surface of the base to form a multi-row and multi-column adjustment matrix, which is used to provide multiple mounting points to achieve multi-directional adjustment of the limiting member.

[0009] In some embodiments, the positioning structure further includes a locking structure disposed between the base and the limiting member, and operable to switch between a locked state and an unlocked state;

[0010] In the locked state, at least a portion of the locking structure is engaged with the limiting member to prevent the limiting member from moving in the detachment direction;

[0011] In the unlocked state, the locking structure disengages from the limiting member, allowing the position of the limiting member to be adjusted.

[0012] In some embodiments, the cross-sectional profile of the limiting member is one of a straight line, a broken line, an arc, a curve, or an irregular shape, and its cross-sectional profile is adapted to the corresponding edge profile of the adapter piece, which is suitable for forming abutment at the corresponding edge position of the adapter piece.

[0013] In some embodiments, the number of limiting members is four, and the four limiting members are detachably installed on at least four positioning units of the base. The lines connecting them together form a rectangular limiting area for limiting and supporting the four corners of the adapter piece.

[0014] In some embodiments, the plurality of positioning units are multiple positioning holes, and the positioning holes are disposed on the surface of the base. The limiting member includes a main body, and the detachable connection structure includes multiple joints. The joints are columnar and disposed at the lower end of the corresponding main body. Each main body is fixedly connected to at least one joint.

[0015] The joint portion can be inserted into the corresponding positioning hole, so that the joint portion and the positioning hole form an insertion connection. The main body portion has a limiting surface, which, after the limiting member is installed on the base, is used to abut against the edge of the adapter piece to provide support and position limitation for the adapter piece under welding conditions, and to prevent it from moving or deviating from its position.

[0016] In some embodiments, the plurality of positioning units are a plurality of threaded holes disposed on the base, and the detachable connection structure includes a plurality of fixing screws and a plurality of adapter holes, wherein the adapter holes are disposed on the corresponding limiting members and penetrate through the thickness direction of the limiting members;

[0017] During use, the fixing screw passes through the corresponding adapter hole and forms a threaded connection with the threaded hole, and presses the gap between the limiting member and the base, thereby fixing the limiting member on the base.

[0018] Another aspect of this application also provides a welding fixture, including: any of the limiting devices described in the above embodiments;

[0019] An operating table, which is the base inside the limiting device;

[0020] The base is provided with a first accommodating position and a second accommodating position, which are arranged adjacent to each other. The first accommodating position is used to accommodate the core of the lithium battery, and the second accommodating position is used to accommodate the adapter piece. The positioning structure is arranged at the second accommodating position to limit the position of the adapter piece when the core and the adapter piece are welded.

[0021] In some embodiments, the first receiving position is provided with a core limiting module, which includes a plurality of limiting blocks that match the outer contour of the core. The limiting blocks surround at least two opposite sides of the first receiving position and are used to position and support the core circumferentially to prevent the core from shaking or shifting during the welding process.

[0022] In some embodiments, the number of the first receiving positions is at least two, wherein the two first receiving positions are respectively disposed on opposite sides of the second receiving position and can form a parallel arrangement with the second receiving position, so that a single adapter piece can simultaneously perform series welding on two cores.

[0023] Compared with the prior art, the limiting device and welding fixture provided in this application have at least the following beneficial effects: by setting a discrete positioning structure on the base and combining it with a detachable connection structure, the limiting component can be flexibly installed on multiple preset positioning units to achieve precise adjustment of the limiting area, thereby adapting to adapter pieces of different sizes or different structural forms, effectively improving the versatility and adaptability of the limiting device, and enabling rapid adjustment when product specifications change, thus meeting the actual needs of lithium battery production lines. Attached Figure Description

[0024] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0025] Figure 1 This is a schematic diagram of the welding fixture in one embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the limiting device in one embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the limiting member in one embodiment of this application;

[0028] Figure 4 This is a partial structural schematic diagram of the limiting device in one embodiment of this application.

[0029] Reference numerals: Base 1; Positioning structure 10; Positioning unit 101; Limiting component 2; Main body 21; Joint 22; Fixing screw 23; Adapter hole 24; First receiving position 31; Second receiving position 32; Core limiting module 4; Limiting block 40. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0031] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections 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 based on the specific circumstances.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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 a limitation of this application.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] In the lithium battery production process, after the core is formed, its positive and negative electrode tabs need to be connected to metal adapter plates by welding to enable subsequent module integration or system assembly. Ultrasonic welding, as a common connection method, has high requirements for the relative position of the welded parts. To ensure welding accuracy, welding auxiliary fixtures are usually needed to accurately position and fix the core and adapter plates, preventing problems such as misalignment or poor contact during the welding process.

[0037] In existing welding fixtures, the limiting structure of the adapter piece is often integrated with the placement device, having a relatively fixed position and structural form. Since different specifications of lithium battery cores may be paired with adapter pieces of different sizes or shapes, their welding areas differ in width, edge length, and lead-out methods. Therefore, limiting structures with different positioning dimensions are required to achieve stable welding. However, most current fixtures have fixed limiting structures, making it difficult to flexibly adapt to various sizes of adapter pieces. Whenever the adapter piece type is changed, the entire fixture must be replaced, resulting in complex operation, high time costs, and poor versatility.

[0038] In one embodiment, refer to the appendix to the specification. Figure 1 This application describes a limiting device that can achieve compatible positioning of adapter pieces of different sizes, which is beneficial to reducing production costs and improving production efficiency.

[0039] Reference manual attached Figure 1 and Figure 2 The limiting device provided in this application includes a base 1 and at least two limiting members 2, as well as a detachable connection structure for connecting the limiting members 2 to the base 1. The base 1 is an integrally formed or assembled structure, serving as an installation support platform for the limiting members 2. The surface of the base 1 is provided with discrete positioning structures 10, each including multiple positioning units 101 distributed on the surface of the base 1. These positioning units 101 are independent and spaced apart, allowing the limiting members 2 to be selectively positioned in multiple preset installation locations.

[0040] Meanwhile, this device connects the limiting member 2 to the base 1 via a detachable connection structure. Specifically, the detachable connection structure may include an installation interface structure formed at the bottom of the limiting member 2 and connecting components adapted to each positioning unit 101. The connecting components can detachably install the limiting member 2 onto the surface of the base 1 through methods such as plugging, snapping, or sliding fit. Through this structural design, the operator can selectively connect the limiting member 2 to multiple preset positioning units 101, thereby forming a limiting area that can be customized according to the actual welding process requirements.

[0041] In actual operation, after the limiting component 2 is connected to different positioning units 101 via a detachable connection structure, it can form a boundary area on the base 1 for supporting and limiting the adapter piece. This ensures that the adapter piece remains stable and has clear boundaries during placement, facilitating precise matching with the core during welding. Thus, when alternating operations for adapter pieces of different sizes or structures, adaptation can be achieved simply by changing the connection position of the limiting component 2, without needing to replace the entire set of tooling, greatly improving operational flexibility and adaptability.

[0042] Understandably, through the above structural design, the limiting device proposed in this utility model can achieve rapid adaptation to adapter pieces of different sizes. During the welding or assembly of lithium batteries, due to the diversity of the size and arrangement of the adapter pieces, traditional fixing structures are difficult to be compatible. However, this device, through the combination of discrete positioning structure 10 and detachable limiting component 2, enables the position of the limiting component 2 to be flexibly adjustable, effectively adapting to the position positioning requirements of various adapter pieces.

[0043] In addition, this solution does not require replacing the entire set of tooling; only the installation position of the limit component 2 needs to be adjusted. The operation is simple, which improves production efficiency and reduces the time and labor costs during the changeover process.

[0044] In practical applications, users can first determine the corresponding limiting area based on the size of the adapter piece and the direction of the tab lead-out required for current production, and then fix the limiting component 2 to the corresponding positioning unit 101. After the adapter piece is placed in the limiting area, it can achieve edge restriction and position stability, thereby avoiding welding deviations caused by offset or shaking during the welding process, and improving welding consistency and reliability.

[0045] In one possible implementation, the positioning unit 101 is a protruding column, and the bottom of the limiting member 2 is provided with a groove that can be fitted onto the column. An elastic clamping structure can be provided inside the groove to improve assembly stability. Of course, the form of the positioning structure 10 can be flexibly selected according to the actual operating habits of the workers in the factory, the material process, and the adaptation of the production line equipment. Designers can make adaptive adjustments without changing the overall principle of the solution.

[0046] Based on the above embodiments, please refer to the appendix to the instruction manual. Figure 2 In one embodiment, multiple positioning units 101 in the positioning structure 10 are evenly arranged along the longitudinal and transverse directions on the main mounting surface of the base 1 (the side closer to the operator, which can be understood as the operating surface), forming an adjustment matrix with multiple rows and columns. The adjustment matrix provides multiple sets of optional mounting points covering the entire limiting area through the regularly distributed positioning units 101, thereby enabling the limiting member 2 to be adjustable in both the transverse and longitudinal directions.

[0047] By adjusting the matrix settings, the operator can flexibly select the installation position of the limiting component 2 in both the longitudinal and transverse dimensions according to the shape, size and welding position requirements of the adapter piece during actual use. This allows the limiting component 2 to be arranged with greater freedom in the planar area, thereby more fully meeting the adaptation needs of adapter pieces of different specifications in terms of placement angle, boundary support and edge clamping.

[0048] Furthermore, maintaining a uniform interval between each positioning unit 101 within the adjustment matrix facilitates rapid positioning and uniform transition of the limiting component 2 during position adjustment. This not only reduces operational complexity but also improves the response efficiency of the tooling in batch switching tasks. Without altering the overall structure of the tooling, adaptation to different welding objects can be achieved simply by rearranging the limiting component 2, further enhancing the flexibility and economy of the tooling.

[0049] It can be seen that by constructing a multi-row, multi-column adjustment matrix on the base 1, the limiting device has multi-directional adjustment capability, which not only enhances the versatility and compatibility of the tooling, but also helps to improve the positioning accuracy and operational efficiency of adapter pieces of different sizes during the welding process, which is conducive to rapid production.

[0050] Based on the above, in one embodiment, the cross-sectional profile of the limiting member 2 is any one of a straight line, a broken line, an arc, a curve, or an irregular shape; of course, the operator can select or customize it according to the edge shape of the adapter piece required for positioning during the actual welding process. The cross-sectional shape of the limiting member 2 is set to correspond to the edge profile of the adapter piece, so that the limiting member 2 can form a close or abutting fit between its working surface and the edge of the adapter piece in the use state, thereby achieving effective limiting support for the adapter piece within the planar range.

[0051] Through this structural design, the limiting component 2 can not only achieve simple limiting of the linear boundary of the adapter piece, but also be used to adapt to non-standard adapter pieces with changes in edge contour or curvature.

[0052] For example, for adapter pieces with curved edges, chamfered edges, or irregular arc surfaces, in this embodiment, the limiting member 2 can achieve boundary envelope support by selecting arc shape, curve shape, or multi-segment broken line structure, thereby improving the fit and stability of the limiting contact and effectively preventing the adapter piece from sliding or tilting due to center of gravity shift or uneven force after placement.

[0053] Furthermore, the cross-section of the limiting component 2 can be adapted to different installation postures to form various limiting effects such as inner corner abutment, outer corner clamping, or end edge limiting, so that the adapter piece obtains clear boundary support in multiple directions, facilitating subsequent precise welding operations. The body of the limiting component 2 can be a one-piece molded structure, or the limiting contour can be quickly changed through replaceable limiting head modules to meet the process conversion requirements of different types of adapter pieces.

[0054] In one embodiment, please refer to the appendix to the specification. Figure 2 The number of limiting members 2 is four, and the four limiting members 2 are detachably installed on at least four different positioning units 101 on the surface of the base 1.

[0055] By reasonably selecting the positions of the four positioning units 101, the installation form of the four limiting members 2 forms an approximately rectangular layout structure, and the lines connecting each limiting member 2 together enclose a limited area. The geometry of this limited area corresponds to the boundary contour of the adapter piece to be welded, thereby forming corresponding limiting supports for the four corners of the adapter piece in space.

[0056] With the above structural arrangement, when the adapter piece is placed in the limiting area, its four corners can respectively contact or abut against the adjacent limiting member 2, thus restricting the movement of the adapter piece in the horizontal plane and avoiding welding misalignment caused by workpiece placement deviation. Especially in ultrasonic welding, the alignment accuracy requirements between the electrode tab and the adapter piece are high. If the adapter piece deflects or slips slightly in the tooling, it may directly affect the quality and consistency of the weld joint. In this embodiment, by setting four limiting members 2 to form a limiting boundary, the adapter piece can be synergistically limited from four different directions, significantly improving the positioning reliability of the workpiece.

[0057] In practical applications, operators can adjust the aspect ratio of the rectangular area formed by flexibly selecting the installation position of the limiting component 2 in the adjustment matrix according to the different sizes and contours of the adapter pieces, so as to adapt to the installation requirements of workpieces of different specifications.

[0058] In one embodiment, the positioning structure 10 further includes a locking structure disposed between the base 1 and the limiting member 2, and used to provide controllable position locking after the limiting member 2 is installed. Specifically, the locking structure can switch between a locked state and an unlocked state: in the locked state, at least a portion of the locking structure is relatively engaged with the limiting member 2 to form an anti-disengagement limit, used to prevent the limiting member 2 from loosening, deflecting, or accidentally falling off under external force; while in the unlocked state, the locking structure is released from engagement with the limiting member 2, allowing the position of the limiting member 2 to be freely adjusted or disassembled.

[0059] It should be noted that the locking structure in this embodiment can be implemented in various forms. In one embodiment, the locking structure can be set as a lock tongue structure that can elastically deform on the limiting member 2, with the lock tongue extending towards the base 1. When the limiting member 2 is inserted into the corresponding positioning unit 101, the lock tongue elastically engages in the preset locking groove or locking hole of the base 1, thereby forming a self-locking state. The user only needs to apply external force to the lock tongue during disassembly to disengage it from the engaged state, thereby unlocking the lock and completing the disassembly or position adjustment of the limiting member 2.

[0060] In another embodiment, the locking structure can be set as an independent locking component, such as a rotatable snap-fit, sliding wedge, or lever-type clamping member, one end of which is connected to the base 1, and the other end can be operably inserted into or pressed onto a preset structural part of the limiting member 2, and the position locking and releasing can be switched through mechanical action.

[0061] Thus, through the locking structure of this embodiment, the limiting member 2 can not only be flexibly adjusted in position according to the size requirements of the adapter piece before welding, but also quickly and stably lock after adjustment. Especially in processes such as ultrasonic welding, due to the high vibration frequency of the welding head and significant mechanical impact, if the limiting member 2 fails to be reliably positioned, it can easily lead to welding position deviation or displacement of the limiting structure, affecting welding accuracy and product consistency. The locking structure introduced in this embodiment can effectively improve the structural constraint force of the limiting member 2, ensuring that it remains in a predetermined state without displacement under stress conditions, thereby ensuring the accuracy and stability of the geometric boundary of the entire limiting area, and significantly improving the reliability of welding operations and product consistency.

[0062] In some application scenarios, the locking structure can be further combined with a directional opening or closing guide design, such as marking the locking status indicator on the base 1, setting a toggle travel limit or similar structure, so that users can quickly identify whether the limit part 2 is in the locked state during the replacement process, and avoid production being affected by the limit part 2 not being locked or improperly installed due to operational errors.

[0063] In one embodiment, the plurality of positioning units 101 are a plurality of positioning holes disposed on the base 1. The positioning holes are regularly arranged in the longitudinal and transverse directions to form an adjustment matrix covering the welding area, which is used to provide optional discrete mounting points for the limiting member 2. Each positioning hole is through along the thickness direction of the base 1 or forms a blind hole of a predetermined depth, and its outline can be set as a circle, square or other regular polygon according to the mating structure.

[0064] like Figure 3As shown, the detachable connection structure mentioned above is a joint 22 located at the bottom of each limiting member 2. The joint 22 is columnar. The limiting member 2 includes a main body 21. Generally, the joint 22 extends downward from the lower surface of the main body 21 and is used to insert and cooperate with the positioning hole to form a positioning connection. It should be noted that the "columnar" shape in this embodiment is not limited to a cylindrical structure, but can adopt different cross-sectional shapes according to the positioning function requirements.

[0065] When the joint 22 adopts a cylindrical structure, it can achieve a certain degree of angular rotation adjustment in the hole after being inserted into the positioning hole, thereby allowing the limiting member 2 to make a slight angle adjustment around its own axis to correct the limiting direction or match the actual corner contour of the adapter piece.

[0066] However, in applications where the angle requirements of the limiting member 2 are high or where strict alignment of the limiting surfaces is required, the joint 22 can be designed as a non-circular cross-section structure, such as a rectangular prism, a regular hexagonal prism, or other polygonal prism structures with directional limiting capabilities. This allows the joint 22 to form an anti-rotation fit after being inserted into the corresponding positioning hole, effectively suppressing the angular displacement of the limiting member 2 due to external forces or vibrations, thereby improving the limiting accuracy and stability to adapt to some high-precision welding operations. Furthermore, based on the content of this embodiment, in one implementation, at least two joints 22 are provided on a main body 21. This design can also achieve the purpose of preventing the limiting member 2 from deflecting. The specific design can be adjusted according to user needs, operator habits, and other factors, and will not be elaborated here.

[0067] Furthermore, based on actual process requirements, a limiting shoulder can be provided on the outer wall of the joint 22, and a limiting step can be provided inside the positioning hole to further limit the insertion depth of the joint 22, ensuring that the height of each limiting member 2 remains consistent after installation, and preventing unevenness of the limiting surface from affecting the stability of the adapter plate. Correspondingly, according to the requirements of ease of installation, the positioning hole can also be designed as a tapered guide opening, so that the joint 22 can be quickly inserted and fixed to form a stable positioning state.

[0068] In one embodiment, such as Figure 4 As shown, multiple positioning units 101 are threaded holes evenly distributed on the surface of the base 1. The threaded holes are arranged regularly or at equal intervals along the main mounting surface of the base 1, forming discretely distributed positioning points. The detachable connection structure includes several fixing screws 23 and matching holes 24 that mate with them. The matching holes 24 are provided on the limiting member 2 and penetrate through the thickness direction of the limiting member 2, thereby forming a through channel. During installation, the fixing screws 23 can pass through the matching holes 24 and be screwed into the corresponding threaded holes. Through the tightening process, the limiting member 2 is pressed against the surface of the base 1, thereby forming a firm installation state.

[0069] Understandably, the connection method in this embodiment relies on standard mechanical fasteners, which are structurally mature and easy to install. This ensures both the flexibility of replacing the limiting component 2 and the reliability of its positioning and structural stability. When subjected to significant vibration or high-frequency impact loads during the welding process, threaded fasteners offer better resistance to disturbances compared to traditional plug-in or snap-fit ​​connections, making them less prone to loosening or falling off. This significantly improves the stability of the limiting system under dynamic conditions.

[0070] In addition, the connection structure is easy to inspect and replace during use. Operators only need to use conventional tools to tighten or loosen the screws to quickly disassemble or reposition the limit component 2, thereby improving the process adaptability efficiency of the whole device under the rhythm of multi-batch and small-volume production.

[0071] Furthermore, a countersunk groove can be provided around the adapter hole 24 so that the fixing screw 23 can be flattened or semi-embedded during the screwing process, avoiding the top of the fixing screw 23 from protruding relatively. This, to a certain extent, prevents parts or people from bumping into the fixing screw 23, and improves the safety and reliability of the limiting device.

[0072] Meanwhile, flexible pads or rigid limiting pieces can be added between the limiting piece 2 and the base 1 to offset the small gaps caused by manufacturing tolerances or assembly errors during installation, thereby further improving the fitting accuracy between the limiting piece 2 and the base 1.

[0073] In one embodiment, refer to the appendix to the specification. Figure 1 According to another aspect of this application, this application further provides a welding fixture for precisely positioning and assisting in welding operations of the core and adapter piece during the lithium battery production process, so as to solve the problem that existing fixtures cannot flexibly adapt to adapter pieces of different sizes.

[0074] The welding fixture includes the limiting device and the operating table as described in the above embodiments. The limiting device includes at least a base 1, a plurality of limiting members 2 detachably mounted on the base 1, and a positioning structure 10 for adjusting the discrete positions of the limiting members 2. The operating table is integrated with the limiting device. Specifically, the operating table is the base 1 body of the limiting device described above, and its main mounting surface is provided with receiving positions for mounting the core and the adapter piece, namely the first receiving position 31 and the second receiving position 32.

[0075] The first accommodating position 31 is used to hold the lithium battery core to be welded, and the second accommodating position 32 is used to hold the adapter piece that mates with the core's tabs. The two accommodating positions are located on the same mounting plane of the worktable, and their adjacent arrangement ensures a suitable horizontal distance between the adapter piece and the core, facilitating subsequent welding. Furthermore, the second accommodating position 32 is provided with a positioning structure 10, which is discretely distributed to facilitate position adjustment of the limiting member 2, thereby limiting the placement and angle of the adapter piece during the welding operation.

[0076] Through the above structural setup, this solution can achieve rapid positioning and limiting support for adapter pieces of different specifications and edge sizes simply by adjusting the relative position of the limiting component 2 on the base 1, without replacing the entire set of tooling.

[0077] Compared with existing fixed welding fixtures, the welding fixture provided by this utility model has greater flexibility in terms of spatial adaptability, effectively covering the compatible positioning of various adapter plate types, improving the versatility of the fixture and production efficiency. In addition, the modular assembly method between the limiting component 2 and the base 1 also facilitates maintenance and replacement, reducing fixture wear and operating costs.

[0078] In the specific implementation process, the core and the adapter piece can be placed in the first accommodating position 31 and the second accommodating position 32 respectively, and the adapter piece can be aligned with the core tab by adjusting the position of the limiting member 2. After the welding operation is completed, the connected parts can be taken out as a whole and then packaged or integrated.

[0079] In one embodiment, please refer to the appendix to the specification. Figure 1 A core limiting module 4 is provided within the first accommodating position 31. The core limiting module 4 includes several limiting blocks 40. The inner contour of the limiting blocks 40 is generally designed according to the outer contour shape of the core to achieve a close fit, thereby forming a surrounding support structure for the core in the circumferential direction. The multiple limiting blocks 40 are arranged around at least two opposite sides of the first accommodating position 31. After the core is placed, they form a circumferential abutment and restriction on the outer edge of the core, thereby restricting its rotation, lateral movement, or shaking within the accommodating space.

[0080] In actual welding operations, the core structure is usually compact and lightweight. However, due to the presence of tabs on its surface, slight displacement or vibration of the core during welding can cause changes in the tab position, thus affecting the welding alignment accuracy with the adapter piece. By setting the core limiting module 4, the core is stably limited to a preset position in the tooling, which helps ensure the accurate consistency of the tab position before and after welding, thereby improving the overall welding quality and product consistency.

[0081] It should be noted that the limiting block 40 in this embodiment can adopt a detachable or replaceable structural design, so as to replace the limiting block 40 of the corresponding specification according to the winding core with different diameters or cross-sectional shapes, so as to quickly adapt to the needs of different models of battery cell products.

[0082] More specifically, the limiting block 40 and the first receiving position 31 can be fixed by plug-in, slide rail or threaded connection, which is convenient for subsequent maintenance or adjustment; the working surface of the limiting block 40 can also be provided with a flexible buffer layer or anti-slip coating as needed to prevent scratches on the core surface or slight slippage during welding vibration.

[0083] In addition, the core limiting module 4 can be arranged as a three-point or multi-point symmetrical support structure, so that the limiting block 40 can not only surround and position the side of the core, but also provide structural constraints on different positions of the core in the vertical or diagonal direction, further enhancing the stability and anti-disturbance ability of the core during the welding process.

[0084] Furthermore, in one embodiment, the number of first receiving positions 31 is at least two, wherein the two first receiving positions 31 are respectively disposed on opposite sides of the second receiving position 32, and together with the second receiving position 32, they can form a parallel arrangement structure. Based on this structure, when an adapter piece is placed in the second receiving position 32, its two corresponding ends can be welded to the winding cores located on both sides, thereby realizing the series connection of a single adapter piece to the two winding core tabs.

[0085] Understandably, through the configuration of this embodiment, firstly, the symmetrical arrangement of the first accommodating position 31 and the second accommodating position 32 allows the two cores to be positioned in the same tooling clamping and maintain a consistent relative position with the adapter piece. This avoids the multiple clamping errors caused by welding the cores one by one in the traditional process, thus improving welding consistency and connection accuracy. Secondly, it simplifies the welding path and operation process to a certain extent, allowing operators or automated equipment to complete the connection of the two cores in one welding cycle, significantly shortening the working time and reducing the frequency of manual intervention, thereby improving the overall welding efficiency.

[0086] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A position limiting device, characterized by, Positioning of adapter pieces during lithium battery production, including: A base, wherein the base is provided with a discrete positioning structure, the positioning structure comprising multiple positioning units; At least two limiting members are detachably mounted on the base; A detachable connection structure is provided between the limiting member and the base, so that the limiting member can be selectively connected to different positioning units, thereby forming an adjustable-spacing limiting area on the base for adapting to adapter pieces of different sizes.

2. The limiting device according to claim 1, characterized in that, Multiple positioning units are evenly arranged in the longitudinal and transverse directions on the main mounting surface of the base to form a multi-row and multi-column adjustment matrix. The adjustment matrix is ​​used to provide multiple mounting points to realize multi-directional adjustment of the limiting component.

3. The limiting device according to claim 1, characterized in that, The positioning structure further includes a locking structure disposed between the base and the limiting member, and is operable to switch between a locked state and an unlocked state. In the locked state, at least a portion of the locking structure is engaged with the limiting member to prevent the limiting member from moving in the detachment direction; In the unlocked state, the locking structure disengages from the limiting member, allowing the position of the limiting member to be adjusted.

4. The limiting device according to claim 1, characterized in that, The cross-sectional profile of the limiting member is one of a straight line, a broken line, an arc, a curve, or an irregular shape, and its cross-sectional profile is adapted to the corresponding edge profile of the adapter piece, which is suitable for forming abutment at the corresponding edge position of the adapter piece.

5. The limiting device according to claim 4, characterized in that, The number of limiting components is four, and the four limiting components are detachably installed on at least four positioning units of the base. The lines connecting them together form a rectangular limiting area for limiting and supporting the four corners of the adapter piece.

6. The limiting device according to any one of claims 1-5, characterized in that, The multiple positioning units are multiple positioning holes, and the positioning holes are disposed on the surface of the base. The limiting member includes a main body, and the detachable connection structure includes multiple joints. The joints are columnar and disposed at the lower end of the corresponding main body. Each main body is fixedly connected to at least one joint. The joint portion can be inserted into the corresponding positioning hole, so that the joint portion and the positioning hole form an insertion connection. The main body portion has a limiting surface, which, after the limiting member is installed on the base, is used to abut against the edge of the adapter piece to provide support and position limitation for the adapter piece under welding conditions, and to prevent it from moving or deviating from its position.

7. The limiting device according to any one of claims 1-5, characterized in that, The multiple positioning units are multiple threaded holes provided on the base. The detachable connection structure includes several fixing screws and several adapter holes. The adapter holes are provided on the corresponding limiting members and penetrate through the thickness direction of the limiting members. During use, the fixing screw passes through the corresponding adapter hole and forms a threaded connection with the threaded hole, and presses the gap between the limiting member and the base, thereby fixing the limiting member on the base.

8. A welding fixture, characterized in that, Includes the limiting device as described in any one of claims 1-7; An operating table, which is the base inside the limiting device; The base is provided with a first accommodating position and a second accommodating position, which are arranged adjacent to each other. The first accommodating position is used to accommodate the core of the lithium battery, and the second accommodating position is used to accommodate the adapter piece. The positioning structure is arranged at the second accommodating position to limit the position of the adapter piece when the core and the adapter piece are welded.

9. The welding fixture according to claim 8, characterized in that, The first receiving position is provided with a core limiting module, which includes a plurality of limiting blocks that match the outer contour of the core. The limiting blocks surround at least two opposite sides of the first receiving position and are used to position and support the core in the circumferential direction to prevent the core from shaking or shifting during the welding process.

10. The welding fixture according to claim 8 or 9, characterized in that, The number of the first receiving positions is at least two, wherein the two first receiving positions are respectively disposed on opposite sides of the second receiving position and can form a parallel arrangement structure with the second receiving position, so that a single adapter piece can simultaneously perform series welding on two cores.

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