Battery pack screw and mold thereof

Abstract

The battery pack screw comprises a screw head, an anti-loosening mechanism arranged on the back face of the screw head and a transition cylinder, one end of the transition cylinder is connected with the screw head, the other end of the transition cylinder is fixedly connected with a screw rod, the outer diameter of the screw head is larger than that of the transition cylinder, the outer diameter of the transition cylinder is larger than that of the screw rod, and the length of the screw rod is larger than that of the transition cylinder. A battery pack screw mold comprises a female mold and a male mold, and the female mold comprises a sleeve, a rear top, a mold top and a female mold insert. The female die insert comprises a sleeve piece, a round wire piece and a die core. According to the scheme, the mold is compact and reasonable in structural design, the round wire sheet and the mold core are tightly wrapped in the trumpet-shaped sleeve sheet, and the C-shaped structure of the cross section of the sleeve sheet is adopted, so that the wrapping force of the whole female mold insert on the round wire sheet and the mold core in the front-back direction and the radial direction is ensured, and the interference fit between the female mold insert and the front end of the sleeve is firm; and the manufactured screw product can reach the standard in quality, the yield is high, the die cost is low, and the die abrasion is small.

Description

Technical Field

[0001] The utility model relates to the field of screw production, in particular to a battery pack screw and its mold. Background Art

[0002] The battery pack is an important component in new energy vehicles and is related to safety. The battery pack needs to be fastened to the vehicle chassis by screws. If ordinary existing screws are used, during the long-term driving and jolting of the vehicle, there are defects such as easy loosening, easy wear, and a decrease in mechanical strength, posing a serious hidden danger to vehicle safety. To overcome the above problems, this solution provides a battery pack screw and its mold. Summary of the Utility Model

[0003] The invention purpose of the utility model lies in the problem that when ordinary existing screws are used for fastening the battery pack, during the long-term driving and jolting of the vehicle, there are defects such as easy loosening, easy wear, and a decrease in mechanical strength, posing a serious hidden danger to vehicle safety. The specific solution is as follows:

[0004] A battery pack screw includes a screw head, a loosening prevention mechanism provided on the back surface of the screw head, a transition cylinder with one end fixedly connected to the middle of the back surface of the screw head and the other end fixedly connected to a screw rod. The outer diameter of the screw head is greater than the outer diameter of the transition cylinder, the outer diameter of the transition cylinder is greater than the outer diameter of the screw rod, and the length of the screw rod is greater than the length of the transition cylinder.

[0005] Furthermore, a hexagon socket hole is provided in the middle of the surface of the screw head, and the surface of the screw head outside the hexagon socket hole is an arc surface.

[0006] Furthermore, the loosening prevention mechanism is a plurality of teeth protruding from the back surface of the screw head, arranged radially and connected in a circumferential direction.

[0007] Furthermore, the length of the screw rod is at least twice the length of the transition cylinder.

[0008] A battery pack screw mold for manufacturing the above-mentioned battery pack screw includes a female mold and a male mold. The female mold includes a sleeve, a rear top provided at the rear end of the sleeve, a mold top provided inside the sleeve and closer to the rear, and a female mold insert provided inside the sleeve and closer to the front. The rear end of the female mold insert abuts against the front end of the mold top. The male mold includes a punch, a hexagonal convex column is provided at the center of the front end of the punch, an arc-shaped groove is provided on the circumference of the hexagonal convex column, and the front end of the hexagonal convex column extends beyond the front end face of the punch.

[0009] Furthermore, the female mold insert includes a trumpet-shaped sleeve piece with a small front end and a large rear end, a round wire piece provided inside the sleeve piece and closer to the front, and a mold core provided inside the sleeve piece and closer to the rear. The rear end of the round wire piece abuts against the front end of the mold core.

[0010] Further, an opening from front to back is provided on the upper side of the sleeve piece, and the cross-section of the sleeve piece is C-shaped.

[0011] Further, a cylindrical cavity penetrating through from front to back is provided at the center of the round wire piece. A toothed ring is provided on the front end face of the round wire piece. A flat ring is connected around the toothed ring. A plurality of equally spaced first exhaust grooves are provided on the circumference of the flat ring. The first exhaust grooves penetrate through the front and back ends of the round wire piece. A plurality of second exhaust grooves in the radial direction are provided on the rear end face of the round wire piece. One end of the second exhaust groove is connected to the rear end of the first exhaust groove, and the other end of the second exhaust groove leads to the rear end of the cylindrical cavity.

[0012] Further, a stud cavity penetrating through from front to back is provided at the center of the die core, and the stud cavity communicates with the cylindrical cavity.

[0013] Further, a thimble cavity penetrating through from front to back is provided at the center of the die top, and the thimble cavity communicates with the stud cavity.

[0014] In summary, adopting the technical solution of the present utility model has the following beneficial effects:

[0015] This solution solves the problem that there are multiple teeth arranged radially and connected circumferentially on the back of the screw head. When locking the screw, there is no need to add a spring washer separately, which saves labor and time, and effectively avoids the problem that the battery pack is prone to looseness during long-term driving and bumping of the vehicle. The transition cylinder provided between the screw head and the screw rod has a diameter larger than that of the screw rod, and has two advantages. One is to accurately position and lock the battery fastening frame with the vehicle chassis, and the other is to disperse the screw fatigue, improve its mechanical strength and anti-wear, and effectively solve the problems of easy wear and decline in mechanical strength during long-term driving and bumping of the vehicle. The die structure of this solution is designed compactly and reasonably, tightly wrapping the round wire piece and the die core inside the horn-shaped sleeve piece. Coupled with the C-shaped structure of the cross-section of the sleeve piece, it ensures the clamping force of the entire female die insert on the round wire piece and the die core in the front-back direction and the radial direction, and the interference fit between the female die insert and the front end of the sleeve is very firm, and there will be no loosening during mass production. The structure of the round wire piece can not only manufacture the teeth on the back of the screw head, but also be provided with the first exhaust grooves and the second exhaust grooves to ensure that the teeth do not deform and are uniform, timely discharging the high-pressure gas during stamping. There is also a flat ring connected around the toothed ring to ensure that the edges of the teeth are not incomplete. The flat ring effectively disperses the punching force of the punch on the outer edge of the toothed ring. Thus, it ensures that the manufactured screw products meet the quality standards, have a high output, low die cost, and small die wear. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the description of the embodiments of the present utility model will be briefly introduced below. Obviously, the accompanying drawings in the following description are only a part of the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0017] Figure 1 Structural diagram of a battery pack screw of the present utility model;

[0018] Figure 2 For Figure 1 Left view;

[0019] Figure 3 For Figure 1 Right view;

[0020] Figure 4 Schematic cross-sectional view of the female mold of a battery pack screw mold of the present utility model;

[0021] Figure 5 Cross-sectional view of the sleeve piece of the present utility model;

[0022] Figure 6 Front-end structural diagram of the round wire piece of the present utility model;

[0023] Figure 7 Cross-sectional view of the round wire piece of the present utility model;

[0024] Figure 8 Rear-end structural diagram of the round wire piece of the present utility model;

[0025] Figure 9 Cross-sectional view of the punch of the present utility model;

[0026] Figure 10 For Figure 9 Right view.

[0027] Explanation of reference numerals:

[0028] 10 - Screw head, 11 - Hexagonal socket hole, 12 - Arc surface, 13 - Teeth, 14 - Thread, 15 - Loosening prevention paint, 20 - Transition cylinder, 30 - Screw rod, 40 - Male mold, 41 - Punch, 42 - Hexagonal convex column, 43 - Arc surface groove, 44 - Annular plane, 50 - Female mold, 51 - Sleeve, 52 - Rear top, 521 - Hollow cavity, 53 - Mold top, 530 - Ejector pin cavity, 54 - Sleeve piece, 55 - Round wire piece, 550 - Cylindrical cavity, 551 - Tooth-shaped ring, 552 - Plane ring, 553 - Concave tooth groove, 554 - First exhaust groove, 555 - Second exhaust groove, 56 - Mold core, 560 - Stud cavity. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0030] As Figures 1 to 3 shown, a battery pack screw includes a screw head 10, a loosening prevention mechanism provided on the back surface of the screw head 10, and a transition cylinder 20 with one end fixedly connected to the middle of the back surface of the screw head 10 and the other end fixedly connected to a screw rod 30. The outer diameter of the screw head 10 is greater than the outer diameter of the transition cylinder 20, the outer diameter of the transition cylinder 20 is greater than the outer diameter of the screw rod 30, and the length of the screw rod 30 is greater than the length of the transition cylinder 20.

[0031] Specifically, a hexagonal socket hole 11 is provided in the middle of the surface of the screw head 10, and the surface of the screw head 10 outside the hexagonal socket hole 11 is an arc surface 12.

[0032] Specifically, the loosening prevention mechanism is a plurality of teeth 13 that protrude from the back surface of the screw head 10, are arranged radially, and are connected in a circumferential direction. Each tooth 13 has the same structure.

[0033] Specifically, the length of the screw rod 30 is at least twice the length of the transition cylinder 20. In order to prevent the thread 14 from loosening, a loosening prevention paint 15 is adhered to the near tail of the screw rod 30.

[0034] As Figures 4 to 10 shown, a battery pack screw mold for manufacturing the above-mentioned battery pack screw includes a female mold 50 and a male mold 40. The female mold 50 includes a sleeve 51, a rear top 52 provided at the rear end of the sleeve 51, and the sleeve 51 is threadedly connected to the rear top 51. A mold top 53 is provided inside the sleeve 51 near the rear. The outer diameter of the front part of the mold top 53 is greater than the outer diameter of the rear part of the mold top 53. The rear part of the mold top 53 is sleeved in the hollow cavity 521 of the rear top 52, so that the front part of the mold top 53 is clamped front and rear by the sleeve 51 and the rear top 52.

[0035] A female mold insert is provided inside the sleeve 51 near the front, and the rear end of the female mold insert abuts tightly against the front end of the mold top 53. The male mold 40 includes a punch 41. A hexagonal convex column 42 is provided at the center of the front end of the punch 41. An arc surface groove 43 is provided on the circumference of the hexagonal convex column 42. The front end of the hexagonal convex column 42 extends beyond the front end face of the punch 41, and this front end face is an annular flat surface 44. The hexagonal convex column 42 is used to punch out the hexagonal socket hole 11, and the arc surface groove 43 is used for stamping the arc surface 12. The male mold 40 further includes a stamping machine (not shown in the figure), and the rear end of the punch 41 is fixed to the head seat of the stamping machine.

[0036] Specifically, the female mold insert includes a trumpet-shaped sleeve 54 with a small front end and a large rear end, a round wire sheet 55 arranged at the front of the sleeve 54, and a mold core 56 arranged at the rear of the sleeve 54. The rear end of the round wire sheet 55 is tightly against the front end of the mold core 56.

[0037] Specifically, the upper side of the sleeve 54 is provided with an opening from front to back, and the cross section of the sleeve 54 is C-shaped (eg Figure 5 shown).

[0038] Specifically, a cylindrical cavity 550 is provided in the center of the round wire sheet 55, which is connected from front to back. The cylindrical cavity 550 is used to place the transition cylinder 20. A toothed ring 551 is provided on the front end face of the round wire sheet 55. The teeth on the toothed ring 551 are concave tooth grooves 553. The cross section of the concave tooth grooves 553 is triangular. A plane ring 552 is connected to the periphery of the toothed ring 551. When punching, the front surface of the plane ring 552 abuts against the front end face (i.e., the annular plane 44) of the punch 41, which effectively disperses the punch 1's impact force on the outer edge of the toothed ring 551, ensuring that the edge of the tooth 13 is not damaged. The toothed ring 551 matches the structure of the anti-loosening mechanism. The toothed ring 551 is used to punch out the tooth 13.

[0039] A plurality of equally spaced first exhaust grooves 554 are provided on the circumference of the planar ring 552, and the first exhaust grooves 554 penetrate the front and rear ends of the round wire piece 55, and a plurality of second exhaust grooves 555 along the radial direction are provided on the rear end surface of the round wire piece 55, and one end of the second exhaust groove 555 is connected to the rear end of the first exhaust groove 554, and the other end of the second exhaust groove 555 leads to the rear end of the cylindrical cavity 550.

[0040] Specifically, a stud cavity 560 is provided at the center of the mold core 56, and the stud cavity 560 is communicated with the cylindrical cavity 550. The stud cavity 560 is used to accommodate a stud, which is the screw rod 30 without thread rolling (i.e., without thread rolling 14).

[0041] Specifically, an ejector pin cavity 530 that passes through from front to back is provided at the center of the mold top 53 , and the ejector pin cavity 530 is communicated with the stud cavity 560 .

[0042] After the first exhaust groove 554 and the second exhaust groove 555 of this solution are connected, the high-pressure gas during stamping is released in time, and the release path is: from the first exhaust groove 554 and the second exhaust groove 555 to the rear end gap of the cylindrical cavity 550, and then through the gap of the stud cavity 560 and the gap of the ejector cavity 530 to be discharged outward. Preferably, the end notch of the second exhaust groove 555 is narrower than the beginning notch thereof, and the second exhaust groove 555 is a gradually narrowing exhaust groove structure.

[0043] In the cold heading four - punch (stamping) process of the battery pack screw die of this solution for battery pack screws, the stamped screw blank is a screw blank that has successively passed through the cold heading material shearing process, the cold heading first - punch process, and the cold heading third - punch process (at this time, there is no thread rolling 14 on the screw blank). After the cold heading four - punch process of this solution is completed (at this time, the internal hexagonal slot hole 11, the arc surface 12, and the tooth teeth 13 are punched), through the thread rolling process and the electroplating process (and then applying anti - loosening paint 15), the finished product of the battery pack screw is obtained. After inspection, it is packaged and stored in the warehouse.

[0044] In summary, adopting the technical solution of the present utility model has the following beneficial effects:

[0045] This solution solves the problem that there are multiple tooth teeth arranged radially and connected circumferentially on the back of the screw head. When locking the screw, there is no need to add a spring washer separately, which saves labor and time, and effectively avoids the problem that the battery pack is prone to looseness during the long - term driving and bumping of the vehicle. The transition cylinder set between the screw head and the screw rod, whose diameter is larger than that of the screw rod, has two advantages. One is to accurately position and lock the battery fastening frame and the vehicle chassis, and the other is to disperse the screw fatigue, improve its mechanical strength and anti - wear performance, effectively solving the problems of easy wear and decreased mechanical strength during the long - term driving and bumping of the vehicle. The die structure design of this solution is compact and reasonable. The round wire piece and the die core are tightly wrapped inside the horn - shaped sleeve piece. Coupled with the C - shaped structure of the cross - section of the sleeve piece, it ensures the clamping force of the entire female die insert on the round wire piece and the die core in the front - to - back direction and the radial direction, and the interference fit between the female die insert and the front end of the sleeve is very firm, and there will be no loosening during mass production. The structure of the round wire piece can not only manufacture the tooth teeth on the back of the screw head, but also be provided with the first exhaust groove and the second exhaust groove to ensure that the tooth teeth do not deform and are uniform, timely discharging the high - pressure gas during stamping, and also be provided with a plane ring connected to the periphery of the tooth - shaped ring to ensure that the edge of the tooth teeth is not incomplete. The plane ring effectively disperses the punching force of the punch on the outer edge of the tooth - shaped ring. Thus, it ensures that the manufactured screw products meet the quality standards, have a high output, low die cost, and small die wear.

[0046] The above - described embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the above - described embodiments shall be included in the protection scope of the technical solution.

Claims

1. A battery pack screw, characterized in that: It includes a screw head, a loosening prevention mechanism provided on the back surface of the screw head, a transition cylinder with one end fixedly connected to the middle of the back surface of the screw head and the other end fixedly connected to a screw rod. The outer diameter of the screw head is greater than that of the transition cylinder, the outer diameter of the transition cylinder is greater than that of the screw rod, and the length of the screw rod is greater than that of the transition cylinder.

2. The battery pack screw according to claim 1, wherein: A hexagonal socket hole is provided in the middle of the surface of the screw head, and the surface of the screw head outside the hexagonal socket hole is an arc surface.

3. The battery pack screw according to claim 1, wherein: The loosening prevention mechanism is a plurality of teeth arranged radially and connected in the circumferential direction protruding from the back surface of the screw head.

4. The battery pack screw according to claim 1, wherein: The length of the screw rod is at least twice the length of the transition cylinder.

5. A battery pack screw mold for manufacturing the battery pack screw according to any one of claims 1 to 4, characterized in that: It includes a female mold and a male mold. The female mold includes a sleeve, a rear top provided at the rear end of the sleeve, a mold top provided inside the sleeve and closer to the rear, and a female mold insert provided inside the sleeve and closer to the front. The rear end of the female mold insert abuts against the front end of the mold top. The male mold includes a punch, and a hexagonal convex column is provided at the center of the front end of the punch. An arc-shaped groove is provided on the circumference of the hexagonal convex column, and the front end of the hexagonal convex column protrudes beyond the front end face of the punch.

6. The battery pack screw mold according to claim 5, wherein: The female mold insert includes a horn-shaped sheet with a small front end and a large rear end, a round wire sheet provided inside the sheet and closer to the front, and a mold core provided inside the sheet and closer to the rear. The rear end of the round wire sheet abuts against the front end of the mold core.

7. The battery pack screw mold according to claim 6, wherein: An opening from front to back is provided on the upper side of the sheet, and the cross-section of the sheet is C-shaped.

8. The battery pack screw mold according to claim 6, characterized in that: A cylindrical cavity penetrating through the front and back is provided at the center of the round wire sheet. A toothed ring is provided on the front end face of the round wire sheet. A flat ring is connected around the toothed ring. A plurality of equally spaced first exhaust grooves are provided on the circumference of the flat ring. The first exhaust groove penetrates through the front and rear ends of the round wire sheet. A plurality of second exhaust grooves in the radial direction are provided on the rear end face of the round wire sheet. One end of the second exhaust groove is connected to the rear end of the first exhaust groove, and the other end of the second exhaust groove leads to the rear end of the cylindrical cavity.

9. The battery pack screw mold according to claim 8, characterized in that: A stud cavity penetrating through the front and back is provided at the center of the mold core, and the stud cavity communicates with the cylindrical cavity.

10. The battery pack screw mold according to claim 9, wherein: A thimble cavity penetrating through the front and back is provided at the center of the mold top, and the thimble cavity communicates with the stud cavity.

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