A heat shrink tubing copper busbar and its injection molding process

Abstract

This invention relates to the field of conductive connection components and discloses a heat-shrinkable copper busbar, including a conductive copper busbar, a heat-shrinkable sleeve, a closure, and an injection molded part. The heat-shrinkable sleeve covers the outside of the conductive copper busbar, and the closure is assembled at the end of the copper busbar near the injection molded part. This invention forms a mechanical circumferential clamping and limiting of the end of the heat-shrinkable sleeve by setting an annular groove at the end of the conductive copper busbar and combining it with a split first closure and a second closure combination structure, which replaces the traditional fixing method that relies solely on the shrinkage and fit of the sleeve itself. This effectively improves the problems of heat-shrinkable sleeve slippage and warping. At the same time, the inclined platform of the first closure is squeezed in conjunction with the injection molding process, driving the deformed end to elastically tighten. The clamping force of the sleeve is strengthened simultaneously in the injection molding process, avoiding sleeve displacement failure caused by the impact of the injection fluid. The insertion groove and snap-fit ​​groove of the injection molded part's surrounding platform achieve secondary locking and positioning, forming a stable full-circumferential sealing clamping structure.

Description

Technical Field

[0001] This invention relates to the field of conductive connection components, and in particular to a heat shrink tubing copper busbar and its injection molding process. Background Technology

[0002] In the fields of new energy power control and energy storage high-voltage modules, integrated injection-molded copper busbar components are widely used. Multiple conductive copper busbars are integrated and positioned by means of an integrated insulating injection molded part. The outer wall of the copper busbar is covered with heat shrink tubing to achieve electrical insulation protection. The conventional processing flow for this type of product is to first install heat shrink tubing on the outside of the copper busbar, heat it to shrink the heat shrink tubing to fit the surface of the copper busbar, and then trim and trim the end of the tubing before insert injection molding.

[0003] Heat shrink tubing relies solely on its own shrinkage force to adhere to the copper busbar surface. The end closest to the injection-molded part lacks a dedicated restraint structure. Under continuous high and low temperature cycles and vibration loads, the heat shrink tubing is prone to slippage along the copper busbar's axial direction. The tubing end easily detaches from its preset position and warps. Due to the difference in thermal expansion and contraction between the dissimilar materials, micro-gaps can easily form at the fitting point between the copper busbar and the injection-molded part. Environmental condensation can penetrate the insulation interface through the channels formed by the warped edge, leading to copper busbar corrosion, insulation degradation, and creepage hazards. Furthermore, the heat shrink tubing's own shrinkage force cannot sustain a continuous end-fitting state; after thermal deformation, localized bulging is likely to occur. When the gaps between the parts are not uniform, it is difficult to form a continuous and effective sealing barrier, and the risk of moisture penetration persists in the long term. This makes it difficult to meet the long-term reliability requirements of high-voltage automotive components. At the same time, during the injection molding process of the insert, there are no additional components to limit and restrain the ends of the heat shrink tubing. The molten plastic is prone to impacting the ends of the heat shrink tubing, causing it to roll over and shift, which further aggravates the sealing failure problem during subsequent use. The industry lacks a supporting structure that can simultaneously strengthen the clamping and limiting of the tubing ends during the injection molding stage and form a continuous locking protection after molding. It is difficult to simultaneously take into account the stability of the production process and the long-term sealing protection performance of the finished product. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a heat shrink tubing copper busbar and its injection molding process. It solves the technical problems of existing integrated injection-molded copper busbars lacking a dedicated constraint structure for the ends of the heat shrink tubing, resulting in easy slippage and warping of the ends, poor sealing reliability, and easy deformation of the tubing ends due to plastic impact during injection molding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A heat shrinkable copper busbar includes a conductive copper busbar, a heat shrinkable sleeve, a closure, and an injection molded part. The heat shrinkable sleeve covers the outside of the conductive copper busbar. The closure is assembled at the end of the copper busbar near the injection molded part and forms a clamping constraint on the end of the heat shrinkable sleeve. The injection molded part is integrally injection molded and integrates and fixes multiple conductive copper busbars. The molding process of the injection molded part can be linked to the deformation of the closure to enhance the clamping and locking effect on the heat shrinkable sleeve.

[0006] Preferably, the outer wall of the conductive copper busbar is provided with an annular groove, and a portion of the sealing member extends into the annular groove to achieve positioning and clamping of the end of the heat shrink tubing.

[0007] Preferably, the closure includes a first closure body and a second closure body that cooperate with each other. The first closure body and the second closure body are arranged around the outside of the end of the heat shrink tubing and cooperate to clamp the heat shrink tubing.

[0008] Preferably, the first enclosed body includes a base one and a base two that are mated together, and the base one and base two are mated together to achieve overall assembly; The base one and base two are provided with matching card protrusions and card slots. The card protrusions can be engaged with the card slots. The inner side of the base one and base two are both extended with a deformation end one. The end of the deformation end one is provided with a clamping end one that can be inserted into the annular groove. The outer side of the base one and base two are both provided with an inclined platform. The first deformable end has elastic deformation capability, the first clamping end extends into the annular groove to clamp the heat shrink tubing, and the tilting platform can be driven by injection molding extrusion force to cause the first deformable end to tighten inward, thereby strengthening the clamping force on the heat shrink tubing.

[0009] Preferably, the second enclosure includes a main body, the main body being provided with a connecting segment for connecting its front and rear structures, and the connecting segment having an extension end extending from its end; The bottom of the main body is provided with an installation structure that corresponds to and is adapted to the insertion slot. The inner side of the main body facing the conductive copper busbar is provided with a second deformable end. The inner side of the second deformable end is provided with a second clamping end that can be embedded in the annular groove. The outer side of the extension end is provided with a buckle end that can cooperate with the snap-fit ​​groove for limiting the position. The second deformable end has elastic extrusion force, the second clamping end extends into the annular groove to clamp the heat shrink tubing, the connecting section is used to connect the main body and the extension end, and the snap-fit ​​end is used to form a snap-fit ​​limit with the injection molded part.

[0010] Preferably, the injection molded part is provided with an upwardly extending platform, the top of the platform is provided with a thickened part, the inner side of the platform is provided with an insertion groove for the second closure body to be inserted, and the side wall of the platform is also provided with a snap-fit ​​groove for locking and limiting. The second enclosure can be aligned and inserted through the insertion slot, and the snap-fit ​​end of the second enclosure can be snapped into the insertion slot to lock and fix the second enclosure to the injection molded part.

[0011] Preferably, after the first closed body is fastened and assembled, the clamping end is positioned within the annular groove and presses against the heat shrinkable sleeve covering the annular groove. During injection molding, the injection molded part squeezes the inclined platform, causing the deformation end to elastically deform, further pressing and fixing the end of the heat shrinkable sleeve.

[0012] Preferably, during assembly, the clamping end two passes through the insertion groove and is embedded into the annular groove, and the deformable end two elastically compresses and stores force inward, cooperating with the first sealing body to circumferentially enclose and clamp the end of the heat shrink sleeve.

[0013] Preferably, the snap-on end snaps into the snap-on groove to form a fixed position, restricting the displacement of the second enclosure and forming a stable full-circumferential clamping and closing structure in conjunction with the first enclosure.

[0014] An injection molding process based on heat shrink tubing copper busbars includes the following steps: S1. Place the heat shrink tubing on the outside of the conductive copper busbar, heat it to shrink the heat shrink tubing to fit the outer wall of the conductive copper busbar, ensuring that the end of the heat shrink tubing completely covers the annular groove of the conductive copper busbar, and then cut off the excess tubing to prevent excess material of the heat shrink tubing from extending into the injection molding area of ​​the part. S2. Fasten and assemble the first sealing body onto the outside of the conductive copper busbar, so that the clamping ends are embedded into the annular grooves in a corresponding manner. Lock the first sealing body by engaging and locking the groove with the protrusion, thereby fixing the position of the first sealing body and initially clamping the end of the heat shrink tubing. S3. Place the pre-installed multiple conductive copper wires into the injection mold and integrally injection mold the injection part. During the injection process, the plastic extrusion tilting table pushes the deformation end to deform inward, further pressing the heat shrink sleeve at the ring groove, and simultaneously forming the surrounding table, thickened part, insertion groove and snap-fit ​​groove. S4. After the injection molded part cools and solidifies, assemble the second sealing body, so that the clamping end two is inserted into the ring groove through the insertion groove, and the elastic force of the deformed end two is used to clamp the heat shrink sleeve. At the same time, the snap-on end is inserted into the snap-on groove to lock and fix it, thus completing the overall assembly.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a mechanical circumferential clamping and limiting mechanism for the heat shrink tubing by setting an annular groove at the end of the conductive copper busbar and combining it with a split first and second sealing body. This replaces the traditional fixing method that relies solely on the shrinkage and adhesion of the tubing itself, effectively improving the slippage and warping issues of the heat shrink tubing. Simultaneously, the tilting platform of the first sealing body is compressed during the injection molding process, causing the deformed end to elastically tighten. This strengthens the clamping force of the tubing during the injection molding process, preventing tubing displacement failure caused by the impact of the injection fluid. The insertion and snap-fit ​​grooves of the injection molding platform provide secondary locking and positioning, forming a stable, fully circumferentially sealed clamping structure. This effectively blocks the water vapor penetration path, reduces the risk of insulation failure and copper busbar corrosion, and improves the product's stability under high and low temperature and vibration conditions. Furthermore, the assembly process is simple and suitable for mass production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a view showing the copper busbar and the injection molded part separated according to the present invention; Figure 3 This is a view of the copper busbar structure of the present invention; Figure 4 This is a structural view of the injection molded part of the present invention; Figure 5 For the present invention Figure 4 Enlarged view at point A in the middle; Figure 6 This is a positional view of the first and second enclosed bodies of the present invention; Figure 7 This is an exploded view of the closure structure of the present invention; Figure 8 This is a separate view of substrate one and substrate two of the present invention.

[0018] Drawing number explanation: 1. Copper busbar; 11. Ring groove; 2. Heat shrink tubing; 3. Injection molded part; 31. Enclosure; 32. Thickened part; 33. Insertion groove; 34. Snap-fit ​​groove; 4. Sealing part; 41. First sealing body; 411. Base one; 412. Base two; 413. Snap-fit ​​protrusion; 414. Snap-fit ​​groove; 415. Deformation end one; 416. Clamping end one; 417. Inclined platform; 42. Second sealing body; 421. Main body; 422. Deformation end two; 423. Clamping end two; 424. Connecting section; 425. Extension end; 426. Snap-fit ​​end. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0021] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this invention.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0023] Example: Please see Figures 1-8 A heat-shrinkable copper busbar and its injection molding process are disclosed. The process includes a conductive copper busbar 1, a heat-shrinkable sleeve 2, a sealing component 4, and an injection molded component 3. The heat-shrinkable sleeve 2 is completely wrapped around the outer surface of the conductive copper busbar 1 to achieve overall insulation coverage of the conductive copper busbar 1. The sealing component 4 is specifically assembled at the end of the conductive copper busbar 1 near the injection molded component 3 to form a mechanical clamping constraint on the end of the heat-shrinkable sleeve 2 near the injection molded component 3. The injection molded component 3 adopts an integral injection molding structure, which can integrate and fix multiple parallel conductive copper busbars 1 into an integral component to achieve multi-row integrated modularization.

[0024] During the molding process, the injection molded part 3 can directly link with the sealing part 4 to generate elastic deformation. During the injection curing stage, it actively enhances the clamping and locking force of the sealing part 4 on the heat shrink sleeve 2, so as to achieve simultaneous completion of molding and reinforcement.

[0025] The outer wall of the conductive copper busbar 1 is provided with an annular groove 11. The groove 11 is located at the end area of ​​the heat shrink tubing 2 near the injection molded part 3. After the closure part 4 is assembled, its local structure can stably extend into the groove 11. Relying on the groove body limiting effect of the groove 11, the end of the heat shrink tubing 2 covered at the groove opening is positioned, pressed and clamped, which completely avoids the problem of warping and slippage caused by the end of the heat shrink tubing 2 being suspended and unrestrained.

[0026] Specifically, the closure 4 is a split enclosure structure, including a first closure body 41 and a second closure body 42 that are assembled together. The first closure body 41 and the second closure body 42 are symmetrically arranged and enclose the outside of the end of the heat shrink tubing 2. The two cooperate with each other and jointly clamp the end of the heat shrink tubing 2 to form a circumferentially wrapped closed clamping structure, ensuring uniform clamping force and no local gaps.

[0027] The first enclosed body 41 is a modular assembly structure, including a first base 411 and a second base 412 that are mated together. After the first base 411 and the second base 412 are mated together, the overall assembly and positioning of the first enclosed body 41 can be quickly completed. The mating positions of the first base 411 and the second base 412 are provided with matching locking protrusions 413 and locking grooves 414. Through the locking engagement of the locking protrusions 413 and the locking grooves 414, the first base 411 and the second base 412 are locked and fixed, preventing them from loosening and shifting after mating.

[0028] Both the inner sides of substrate 1 411 and substrate 2 412 are integrally provided with deformable end 415. Deformable end 415 is a cantilever structure with elastic deformation capability. It can generate elastic contraction under external pressure and rebound to its original position after the external force is removed. Each inner end of deformable end 415 is provided with clamping end 416. Clamping end 416 can be precisely inserted into the annular groove 11 of the conductive copper busbar 1 and directly press the heat shrinkable sleeve 2 covering the groove opening of the annular groove 11. At the same time, both the outer sides of substrate 1 411 and substrate 2 412 are provided with inclined platform 417. Inclined platform 417 is an inclined guide and pressure structure. During the injection molding process, the molten plastic flows and squeezes the inclined surface of inclined platform 417, which can drive deformable end 415 to elastically tighten towards the center of the copper busbar, further pressing clamping end 416, greatly improving the clamping tightness of the heat shrinkable sleeve 2 end, and realizing synchronous force enhancement and reinforcement during the injection molding process.

[0029] Correspondingly, the second enclosed body 42 includes a main body 421. A connecting section 424 is provided in the middle of the main body 421. The connecting section 424 is used to connect the front and rear split structures of the main body 421 to ensure the overall structural strength and integrity. The end of the connecting section 424 extends outward to form an extension end 425. The extension end 425 is used to arrange a snap-fit ​​limiting structure.

[0030] The bottom of the main body 421 is formed with an adaptive installation structure, which can be aligned and fitted with the insertion groove 33 of the injection molded part 3 for interlocking assembly. The inner side of the main body 421 facing the conductive copper busbar 1 is integrally provided with a second deformable end 422. The second deformable end 422 also has the ability to store elastic extrusion force, which can generate elastic pre-tightening force during assembly extrusion. The inner end of the second deformable end 422 is provided with a second clamping end 423. The second clamping end 423 can pass through the insertion groove 33 and be embedded in the annular groove 11. It cooperates with the first clamping end 416 of the first closure body 41 to clamp the end of the heat shrink tubing 2 from multiple points in the circumference. The outer side of the extension end 425 is provided with a snap-fit ​​end 426. The snap-fit ​​end 426 can be snapped into the snap-fit ​​groove 34 of the injection molded part 3 to realize the fixed positioning of the second closure body 42 and the injection molded part 3.

[0031] Among them, the injection molded part 3 is integrally formed with an upwardly extending platform 31. The platform 31 is a protective support structure surrounding the end of the copper busbar. The top of the platform 31 is provided with a thickened part 32, which can improve the structural strength of the top of the platform 31 and avoid cracking and deformation under long-term stress. The inner side of the platform 31 is provided with an insertion groove 33, which is arranged vertically through, allowing the second enclosure 42 to be vertically aligned and inserted. The side wall of the platform 31 is provided with a snap-fit ​​groove 34, which is used to match the snap-fit ​​end 426 to achieve locking and fixation. After the second enclosure 42 is aligned and inserted into place through the insertion groove 33, the snap-fit ​​end 426 elastically snaps into the snap-fit ​​groove 34, completely restricting the vertical and horizontal displacement of the second enclosure 42 and ensuring assembly stability.

[0032] In the actual assembly and molding process, the first closed body 41 is pre-fitted onto the outside of the conductive copper busbar 1. After assembly, the clamping end 416 is stably limited inside the annular groove 11. The heat shrink sleeve 2 is pre-pressed to fix the position of the annular groove 11 to prevent the sleeve from loosening and shifting before injection molding. In the injection molding process, the molten plastic squeezes the inclined platform 417 on the outside, continuously driving the deformation end 415 to elastically deform inward, further pressing the end of the heat shrink sleeve 2 to offset the risk of displacement caused by the impact force of the injection fluid. After molding, the plastic is cured, and the deformation end 415 remains in a pre-tight clamping state.

[0033] After the injection molded part 3 has completely cooled and solidified and its structure has stabilized, the assembly of the second enclosure 42 is carried out. During assembly, the second enclosure 42 is inserted into the insertion groove 33 from top to bottom, so that the inner clamping end 423 is simultaneously embedded into the annular groove 11. During the assembly process, the deformation end 422 is squeezed to generate elastic storage force, forming a continuous inward pre-tightening elastic force, which cooperates with the first enclosure 41 to achieve circumferential encirclement clamping. Finally, the snap-on end 426 snaps into the snap-on groove 34 to complete the locking and completely fix the position of the second enclosure 42. The two work together to form a complete circumferential clamping and sealing structure.

[0034] This embodiment also discloses the complete injection molding process of the above-mentioned heat shrink tubing copper busbar, the specific process of which is as follows: S1. Pre-fit the heat shrink tubing 2 with matching specifications onto the outside of the conductive copper busbar 1. Use hot air heating to make the heat shrink tubing 2 shrink evenly and fit tightly against the outer wall surface of the conductive copper busbar 1. During the assembly process, strictly control the length of the tubing to ensure that the end of the heat shrink tubing 2 near the injection molded part 3 completely covers the annular groove 11 of the conductive copper busbar 1. This ensures that the clamping end can accurately press the end of the tubing. Then, use a tool to cut off the excess heat shrink tubing 2 material to prevent the excess tubing from extending into the molding area of ​​the injection molded part 3 and to prevent injection molding overmolding and overflow defects.

[0035] S2. Attach the first substrate 411 and the second substrate 412 to the outside of the conductive copper busbar 1, so that the clamping end 416 at both ends is precisely aligned with the position of the annular groove 11. Press the first substrate 411 and the second substrate 412 to make the locking protrusion 413 and the locking groove 414 automatically engage and lock, thus completing the pre-installation and fixing of the first sealing body 41. At this time, the clamping end 416 initially presses against the heat shrink sleeve 2 at the annular groove 11, thus achieving the initial limiting and fixing of the sleeve end and avoiding pre-injection displacement.

[0036] S3. Multiple pre-installed conductive copper busbars 1 are positioned and placed inside the injection mold. After precise positioning, the mold is closed, and molten plastic is injected to integrally mold the injection part 3. During the injection process, the flowing molten plastic continuously squeezes the inclined platform 417 outside the first closed body 41. The squeeze inclined surface drives the deformation end 415 to undergo a slight inward elastic deformation, further pressing the end of the heat shrink sleeve 2 at the annular groove 11, achieving simultaneous reinforcement and clamping during the injection process. This injection process simultaneously integrally molds the surrounding platform 31, the top thickened part 32, the inner insertion groove 33, and the side wall snap-fit ​​groove 34. All structures are molded in one step, requiring no secondary processing.

[0037] S4. After the injection molded part 3 has cooled naturally and fully set, remove the whole assembly and assemble the second closure body 42. Push the vertical alignment insertion groove 33 of the second closure body 42 inward so that the clamping end 423 passes through the insertion groove 33 and is embedded in the annular groove 11. The deformable end 422 is squeezed to generate elastic pre-tightening force, which, together with the first closure body 41, surrounds and clamps the end of the heat shrink tubing 2. Finally, the snap-on end 426 on the outside of the extension end 425 elastically snaps into the snap-on groove 34, completing the locking and fixing of the second closure body 42, and finally forming an integrated heat shrink tubing copper busbar assembly with stable structure and reliable clamping.

[0038] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A heat shrink tubing copper busbar, characterized in that, It includes a conductive copper busbar (1), a heat shrink tubing (2), a closure (4), and an injection molded part (3); The heat shrink tubing (2) covers the outside of the conductive copper busbar (1). The closure (4) is assembled at the end of the copper busbar (1) near the injection molded part (3) and forms a clamping constraint on the end of the heat shrink tubing (2). The injection molded part (3) is integrally injection molded and integrates and fixes multiple conductive copper busbars (1). The molding process of the injection molded part (3) can be linked to the deformation of the closure (4) to enhance the clamping and locking effect on the heat shrink tubing (2).

2. The heat shrink tubing copper busbar according to claim 1, characterized in that, The outer wall of the conductive copper busbar (1) is provided with an annular groove (11), and a partial structure of the sealing member (4) extends into the annular groove (11) to achieve positioning and clamping of the end of the heat shrink tubing (2).

3. The heat shrink tubing copper busbar according to claim 2, characterized in that, The closure (4) includes a first closure body (41) and a second closure body (42) that cooperate with each other. The first closure body (41) and the second closure body (42) are arranged around the outside of the end of the heat shrink tubing (2) and cooperate to clamp the heat shrink tubing (2).

4. A heat shrink tubing copper busbar according to claim 3, characterized in that, The first enclosed body (41) includes a base one (411) and a base two (412) that are connected and interlocked. The base one (411) and the base two (412) are connected and interlocked to achieve overall assembly. The first base (411) and the second base (412) are provided with matching protrusions (413) and slots (414). The protrusions (413) can engage with the slots (414). The inner side of the first base (411) and the second base (412) are both extended with a deformable end (415). The end of the deformable end (415) is provided with a clamping end (416) that can be inserted into the annular groove (11). The outer side of the first base (411) and the second base (412) are both provided with an inclined platform (417). The first deformable end (415) has elastic deformation capability, the first clamping end (416) extends into the annular groove (11) to clamp the heat shrink tubing (2), and the tilting platform (417) can be driven by injection molding extrusion force to tighten the first deformable end (415) inward, thereby strengthening the clamping force on the heat shrink tubing (2).

5. A heat shrink tubing copper busbar according to claim 3, characterized in that, The second enclosure (42) includes a main body (421), on which a connecting segment (424) for connecting its front and rear structures is provided, and an extension end (425) extends from the end of the connecting segment (424). The bottom of the main body (421) is provided with an installation structure that corresponds to and is adapted to the insertion slot (33). The inner side of the main body (421) facing the conductive copper busbar (1) is provided with a deformation end two (422). The inner side of the deformation end two (422) is provided with a clamping end two (423) that can be embedded in the ring groove (11). The outer side of the extension end (425) is provided with a buckle end (426) that can cooperate with the snap-fit ​​slot (34) for positioning. The second deformable end (422) has elastic extrusion force, the second clamping end (423) extends into the annular groove (11) to clamp the heat shrink tubing (2), the connecting section (424) is used to connect the main body (421) and the extension end (425), and the snap-fit ​​end (426) is used to form a snap-fit ​​limit with the injection molded part (3).

6. A heat shrink tubing copper busbar according to claim 3, characterized in that, The injection molded part (3) is provided with an upwardly extended platform (31), the top of the platform (31) is provided with a thickened part (32), the inner side of the platform (31) is provided with an insertion groove (33) for the second closure (42) to be inserted, and the side wall of the platform (31) is also provided with a snap-fit ​​groove (34) for snap-fit ​​limiting. The second enclosure (42) can be aligned and inserted through the insertion groove (33), and the snap-on end (426) of the second enclosure (42) can be snapped into the insertion groove (34) to achieve locking and fixing of the second enclosure (42) and the injection molded part (3).

7. A heat shrink tubing copper busbar according to claim 4, characterized in that, After the first closed body (41) is fastened and assembled, the clamping end (416) is positioned in the annular groove (11) and presses and covers the heat shrink sleeve (2) at the annular groove (11). During injection molding, the injection molded part (3) squeezes the inclined table (417) to drive the deformation end (415) to elastically deform and further press and fix the end of the heat shrink sleeve (2).

8. A heat shrink tubing copper busbar according to claim 5, characterized in that, When the second closure body (42) is assembled, the clamping end (423) passes through the insertion groove (33) and is aligned and embedded in the ring groove (11). The deformable end (422) is elastically squeezed inward to store force, and cooperates with the first closure body (41) to circumferentially enclose and clamp the end of the heat shrink sleeve (2).

9. A heat shrink tubing copper busbar according to claim 6, characterized in that, The buckle end (426) is inserted into the snap-fit ​​groove (34) to form a fixed position, restricting the displacement of the second closed body (42), and together with the first closed body (41) to form a stable full-circumferential clamping and closing structure.

10. An injection molding process based on the heat shrink tubing copper busbar according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Place the heat shrink tubing (2) on the outside of the conductive copper busbar (1), heat it to shrink the heat shrink tubing (2) to fit the outer wall of the conductive copper busbar (1), and ensure that the end of the heat shrink tubing (2) completely covers the annular groove (11) of the conductive copper busbar (1). Then cut off the excess tubing to prevent the excess material of the heat shrink tubing (2) from extending into the molding area of ​​the injection molded part (3). S2. The first sealing body (41) is fastened and assembled on the outside of the conductive copper busbar (1), so that the clamping end (416) is embedded in the annular groove (11), and the first sealing body (411) is fixed and the end of the heat shrink tubing (2) is initially clamped by the locking protrusion (413) and the locking groove (414). S3. Place the pre-assembled multiple conductive copper busbars (1) into the injection mold and integrally injection mold the injection part (3). During the injection process, the plastic extrusion tilting table (417) pushes the deformation end (415) to deform inward, further pressing the heat shrink sleeve (2) at the ring groove (11), and simultaneously forming the surrounding table (31), the thickened part (32), the insertion groove (33) and the snap-fit ​​groove (34). S4. After the injection molded part (3) is cooled and shaped, the second sealing body (42) is assembled so that the clamping end (423) is inserted into the ring groove (11) through the insertion groove (33), and the heat shrink sleeve (2) is clamped by the elastic force of the deformation end (422). At the same time, the snap-on end (426) is inserted into the snap-on groove (34) to lock and fix it, thus completing the overall assembly.

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