New energy battery pack lower guard plate forming die

Abstract

The utility model provides a new energy battery pack lower fender forming die, including upper die and lower die, the lower end surface edge of upper die is spaced apart and is provided with a plurality of punches along fender contour direction, the centre of punch all is provided with spring hole, the lower end surface of upper die and the upper end surface of lower die all are provided with exhaust groove correspondingly, exhaust groove is connected with the forming cavity of upper die, lower die respectively, the utility model discloses, through setting up punch structure, can even transfer forming force to fender edge, ensure the edge forming effect, and when opening the mould can be pushed by spring elastic force and promote the material pin to separate fender from the punch surface, realize even demoulding, avoid sticking die problem, and simultaneously with the detachable connection of mounting hole and bolt, can replace punch alone according to different specifications fender demand, need not to replace whole upper die, greatly reduce the mould modification cost, improve mould adaptability.

Description

Technical Field

[0001] This utility model relates to the field of battery pack protective plate technology, specifically a molding die for a lower protective plate of a new energy battery pack. Background Technology

[0002] The lower guard plate of a new energy battery pack is a protective component, primarily used to prevent external impurities such as road debris, sewage, and dust from entering the battery pack. It must also withstand the impacts, vibrations, and ground friction during vehicle operation, playing a crucial role in ensuring the structural safety and operational stability of the battery cells within the pack. Currently, the lower guard plate of new energy battery packs is mostly manufactured using a stamping process.

[0003] However, in existing processing molds, the punch is often fixed as an integral part of the upper mold. Changing the guard plate to different specifications requires replacing the entire mold, which is costly. Moreover, the guard plate is easy to stick to the surface of the punch when the mold is opened, which affects the processing efficiency. Furthermore, the venting groove has a limited coverage area, making it difficult for air and debris to be discharged from the cavity during stamping, which leads to defects such as wrinkles and bubbles on the guard plate. Utility Model Content

[0004] The purpose of this utility model is to provide a molding die for the lower guard plate of a new energy battery pack, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A mold for forming a lower guard plate of a new energy battery pack includes: The upper mold and the lower mold are provided. Multiple punches are spaced apart along the outline of the guard plate on the lower end edge of the upper mold. Each punch has a spring hole at its axial center. A spring and an ejector pin are fitted into the spring hole. One end of the spring abuts against the bottom of the spring hole, and the other end is fixedly connected to one end of the ejector pin. The other end of the ejector pin extends out of the spring hole. When the mold is opened, the spring force pushes the ejector pin to separate the forming guard plate from the surface of the punch, so as to achieve uniform mold opening and avoid deformation of the guard plate. The lower end face of the upper mold and the upper end face of the lower mold are respectively provided with venting grooves. The venting grooves are connected to the forming cavities of the upper mold and the lower mold, respectively, and are used to quickly discharge the compressed air and metal chips in the cavity during the stamping process to prevent the protective plate from wrinkling, denting and air bubbles.

[0006] Preferably, the venting groove of the upper mold includes an upper venting groove I. There are two sets of upper venting grooves I. The two sets of upper venting grooves I are respectively arranged along the left and right edges of the upper mold to vent air from the cavity near the punches on both sides of the upper mold. Each end of the channel of the upper venting groove I is provided with an upper clearance hole I. The upper clearance hole I is connected to the channel of the upper venting groove I.

[0007] Preferably, the venting groove of the upper mold further includes an upper venting groove II, which is located in the middle forming area of ​​the upper mold. The upper venting groove II has a "well" shaped structure, with its horizontal and vertical channels perpendicular to each other and connected to form a covering venting mesh structure. Each end of the channel of the upper venting groove II is provided with an upper clearance hole II, which is connected to the channel of the upper venting groove II.

[0008] Preferably, the venting groove of the lower mold includes a lower venting groove I, and there are two sets of lower venting grooves I. The two sets of lower venting grooves I are respectively arranged along the left and right edges of the lower mold. The lower venting grooves I and the upper venting grooves I are staggered in the horizontal direction to avoid the venting grooves blocking each other and causing blockage of the venting passage when the upper and lower molds are closed. The lower venting grooves I are connected to the outer edge of the lower mold to realize the rapid exhaust of air. Each branch end of the lower venting groove I is provided with a lower clearance hole I.

[0009] Preferably, the venting groove of the lower mold further includes a lower venting groove II, which is located in the middle forming area of ​​the lower mold. The lower venting groove II has a "M"-shaped structure, and its channel is divided into a transverse main groove and multiple sets of longitudinal support grooves. The longitudinal support grooves are respectively perpendicularly connected to the transverse main groove and are arranged in segments. There is a gap between two adjacent sets of longitudinal support grooves so that the lower venting groove II is broken in the middle, forming two independent venting branches. Each branch end of the lower venting groove II is provided with a lower clearance hole II to avoid the ejection mechanism in the lower mold and assist in venting.

[0010] Preferably, the four corners of the lower end face of the upper mold and the four corners of the upper end face of the lower mold are provided with corresponding profiles. The profiles are smooth planar structures that fit each other. When the upper and lower molds are closed, the profiles of the upper mold and the profiles of the lower mold contact each other first, so as to achieve the pre-positioning of the upper and lower molds.

[0011] Preferably, guide rods are fixedly installed on the upper and lower edges of the upper mold and the lower mold, respectively. The guide rods are cylindrical in shape, and the guide rods of the upper mold and the lower mold correspond one-to-one. The axes of the corresponding guide rods are collinear, which is used to guide the upper and lower molds to align along the axial direction during the mold closing process, so as to avoid the mold closing misalignment and the resulting deviation in the forming size of the guard plate.

[0012] Preferably, mounting holes are provided on both sides of the punch. The mounting holes are countersunk holes, and bolts are inserted into the mounting holes to achieve detachable fixing of the punch and the upper mold. This facilitates the replacement of the punch according to the forming requirements of different specifications of the guard plate and reduces the cost of mold modification.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention, by setting a punch structure, can uniformly transmit forming force to the edge of the guard plate, ensuring the edge forming effect; and during mold opening, the spring force can push the ejector pin to push the guard plate away from the punch surface, achieving uniform demolding and avoiding the problem of sticking to the mold; at the same time, with the detachable connection of mounting holes and bolts, the punch can be replaced individually according to the needs of different specifications of guard plates, without replacing the entire upper mold, which greatly reduces the mold modification cost and improves the mold adaptability.

[0014] This invention, by setting up venting channels in coordination between the upper and lower molds, can fully cover the forming area of ​​the mold, quickly expel compressed air and metal debris from the cavity during the stamping process, and effectively avoid forming defects such as wrinkles, dents, and bubbles in the protective plate; at the same time, the filter screen can filter debris to prevent the venting channels from clogging, the staggered design avoids the formation of dead cavities in the venting channels when the upper and lower molds are closed, the segmented structure ensures that other branches can still vent when a single channel is blocked, and the clearance holes can avoid ejector pins and ejection mechanisms in the mold, thus ensuring the stable and efficient operation of the venting system as a whole. Attached Figure Description

[0015] Figure 1 This is a bottom view of the upper mold of this utility model; Figure 2 This is a top view of the lower mold of this utility model; Figure 3 These are side views of the upper and lower molds of this utility model; Figure 4 This is a structural diagram of the punch of this utility model.

[0016] In the diagram: 1. Upper mold; 2. Mold surface; 3. Guide rod; 4. Upper mold cavity; 5. Upper venting groove I; 6. Upper clearance hole I; 7. Upper venting groove II; 8. Upper clearance hole II; 9. Punch; 901. Mounting hole; 902. Spring hole; 10. Lower mold; 11. Lower mold cavity; 12. Lower venting groove I; 13. Lower clearance hole I; 14. Lower venting groove II; 15. Lower clearance hole II. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example: Please see Figures 1 to 4 This utility model provides a technical solution: A molding die for a lower protective plate of a new energy battery pack includes an upper die 1 and a lower die 10, wherein the upper die 1 and the lower die 10 respectively have an upper mold cavity 4 and a lower mold cavity 11.

[0019] Multiple punches 9 are evenly distributed along the outer contour of the outer edge of the upper mold 1. The number and spacing of the punches 9 are designed according to the forming requirements of the outer edge of the outer plate (such as edge flanging and local punching). The spacing between adjacent punches 9 is preferably 15-20mm to ensure that the forming force on the outer edge of the outer plate is evenly transmitted.

[0020] Each punch 9 has a through-hole spring hole 902 at its axial center. The inner diameter of the spring hole 902 is adapted to the thickness of the guard plate, preferably 8-12mm. A compression spring and an ejector pin are installed in the hole. One end of the spring is fixed to the bottom of the spring hole 902 by spot welding, and the other end is connected to one end of the ejector pin by interference fit. The other end of the ejector pin extends out of the spring hole 902, preferably by 3-5mm, and this length does not exceed 1 / 2 of the guard plate thickness to avoid interference between the ejector pin and the lower die during stamping. The core function of this structure is in the mold opening stage: when the upper die 1 returns to its original position after stamping, the spring recovers its deformation from the compressed state, and the resulting elastic force pushes the ejector pin to extend axially along the spring hole 902, actively pushing the forming guard plate that is attached to the surface of the punch 9 away. This avoids the "sticking" problem caused by the metal adhesion or shape fit of the guard plate, achieving uniform demolding and effectively reducing the deformation of the guard plate edge. The deformation error can be controlled within 0.05mm.

[0021] It should be noted that, to achieve flexible adaptation and maintenance of the punches 9, countersunk mounting holes 901 are symmetrically provided on both side walls of each punch 9. The diameter of the mounting holes 901 is preferably 8-10mm, and the hole depth is preferably 5-6mm, with the countersunk portion preferably having a depth of 2-3mm, ensuring that the bolt head is fully embedded and does not protrude from the outer side wall of the punch 9. M8-M10 hexagonal socket head cap bolts are inserted into the holes, and the bolt shank forms a threaded connection with the threaded hole pre-set on the lower end face of the upper die 1. This detachable fixing structure allows for the replacement of punches 9 of corresponding sizes simply by removing the bolts when processing guard plates of different specifications, without replacing the entire upper die 1, reducing die modification costs and shortening die changeover time.

[0022] The lower end face of the upper mold 1 and the upper end face of the lower mold 10 are both designed with corresponding venting groove systems, and each venting groove is equipped with a clearance hole.

[0023] Two sets of upper venting grooves I5 are provided, extending along the left and right edges of the upper mold 1 respectively. The extension direction is completely consistent with the distribution direction of the punches 9, ensuring coverage of the cavity area near the punches 9. The width of the venting groove is preferably 3-5mm. This width avoids clogging caused by being too narrow and prevents metal sheet overflow caused by being too wide. The groove depth is preferably 0.08-0.12mm. This depth needs to be less than 1 / 10 of the thickness of the protective plate to avoid affecting the forming accuracy of the protective plate. The groove wall adopts a rounded transition treatment, and the radius of the rounded corner is preferably R0.5mm to reduce air flow resistance. Each end of the upper venting groove I5 is provided with an upper clearance hole I6. The diameter of the clearance hole is preferably 5-8mm. The hole wall is smoothly connected to the venting groove channel. It is used to avoid the ejector pin assembly in the upper mold 1 (the diameter of the ejector pin is usually 4-6mm, and the gap between the clearance hole and the ejector pin is controlled at 0.5-1mm to avoid the ejector pin movement jamming), and can also temporarily store metal debris through the space inside the hole, assisting the venting groove to achieve efficient venting.

[0024] For the middle forming area of ​​the upper mold 1 (deep cavities and boss areas prone to air accumulation), an upper venting groove II 7 is designed. This venting groove has a grid-like structure, with horizontal and vertical channels perpendicular to each other and completely connected. The intersections are rounded to avoid dead zones for air accumulation. The groove width is preferably 2.5–4 mm, and the groove depth is preferably 0.05–0.1 mm. The coverage area is not less than 80% of the total area of ​​the middle forming area of ​​the upper mold 1, ensuring complete coverage of the middle area. Each end of the upper venting groove II 7 also has an upper clearance hole II 8, with the same diameter as the upper clearance hole I 6. The hole contains a removable filter screen, preferably with a mesh size of 80-100, which can filter metal debris to prevent clogging of the venting groove while not affecting airflow.

[0025] The lower venting groove I12 of the lower mold 10 is symmetrically distributed with the upper venting groove I5 of the upper mold 1, and there are two sets of them extending along the left and right edges of the lower mold 10. However, they are staggered from the upper venting groove I5 in the horizontal direction, with a staggered distance preferably of 10-15mm. This staggered design can prevent the openings of the upper and lower venting grooves from blocking each other and forming a "dead cavity" when the upper and lower molds are closed, ensuring that the venting passage is unobstructed throughout. The width and depth of the lower venting groove I12 are exactly the same as those of the upper venting groove I5, and the end of the groove is directly connected to the outer edge of the lower mold 10. The connection point is provided with an outward inclined bevel, with a bevel angle preferably of 15°, to accelerate air discharge. The end point of the groove is correspondingly provided with a lower clearance hole I13, the diameter of which is adapted to the upper clearance hole I6, to avoid the ejection mechanism (such as ejector block, ejector tube) in the lower mold 10, and at the same time assist in the discharge of air from the lower mold cavity 11.

[0026] The lower venting groove II14 in the middle forming area of ​​the lower mold 10 adopts a "Mega" shaped structure. Based on a horizontal main groove, the length of which is the same as the width of the middle area of ​​the lower mold 10, multiple sets of longitudinal support grooves are vertically connected to the horizontal main groove. These longitudinal support grooves are segmented, with a gap between adjacent sets of longitudinal support grooves, preferably 5-8 mm, forming multiple independent venting branches within the lower venting groove II14. This segmented design prevents venting failure in the entire middle area due to blockage of a single channel; even if one branch is blocked, other branches can still vent normally. The width and depth of the lower venting groove II14 are the same as those of the upper venting groove II7. The lower clearance holes II15 at the endpoints of each branch not only avoid the ejection mechanism of the lower mold 10 but also guide air outwards through the guide slope within the holes, preferably at an angle of 30°, further improving venting efficiency.

[0027] The four corners of the lower end face of the upper mold 1 and the four corners of the upper end face of the lower mold 10 are each provided with a corresponding profile 2. The profile 2 is a smooth, planar structure that fits each other, and is preferably processed by grinding. When the upper and lower molds 10 begin to close, the profile 2 at the four corners will first contact other forming parts, and the initial positioning is achieved through the contact between the planes, laying the foundation for mold closing. At the same time, the edges of the profile 2 are chamfered, and the chamfer size is preferably 0.5mm, to prevent the edges of the profile 2 from scratching the metal sheet when the mold closes.

[0028] Cylindrical guide rods 3 are fixedly installed on the upper and lower edges of the upper mold 1 and the lower mold 10, respectively. The guide rods 3 are preferably made of Cr12MoV mold steel, with a surface hardened to a hardness of HRC58-62 to ensure wear resistance. The guide rods 3 of the upper mold 1 and the lower mold 10 are one-to-one, with their axes completely collinear. The length of each guide rod 3 is not less than 1.2 times the maximum closing stroke of the upper and lower molds 10. For example, when the maximum closing stroke is 200mm, the length of the guide rod 3 is not less than 240mm. This ensures that the guide rods 3 can constrain the movement direction of the upper and lower molds 10 throughout the entire mold closing process, preventing lateral offset and improving the accuracy of the protective plate.

[0029] In use, the metal sheet to be processed is first precisely placed in the positioning area of ​​the lower mold cavity 11 of the lower mold 10. The lower mold 10 is fixed to the press worktable, and the upper mold 1 is rigidly connected to the press slide by bolts. The press, as the driving structure, provides stamping power to the mold. After starting the equipment, the press drives the slide to move the upper mold 1 vertically downward. During the downward movement, the profiles 2 at the four corners of the lower end face of the upper mold 1 first fit with the profiles 2 at the four corners of the upper end face of the lower mold 10, achieving initial pre-positioning of the upper and lower molds. Then, the guide rods 3 on the edges of the upper and lower molds 10 cooperate to guide the upper mold 1 to continue to move smoothly downward until the mold is fully closed. During the mold closing process, the punch 9 on the lower end face edge of the upper mold 1 contacts the metal sheet and applies stamping force, completing the process. The forming process includes flanging and punching of the edge of the protective plate. Simultaneously, compressed air and metal debris in the cavity are quickly discharged through the upper venting grooves I5, II7 and corresponding upper clearance holes I6 and II, as well as the lower venting grooves I12, II14 and corresponding lower clearance holes I13 and II, to prevent forming defects in the protective plate. After stamping, the press drives the slider to move the upper mold 1 upward to reset. At this time, the compression spring in the punch 9 returns to its original shape and pushes the ejector pin to push the protective plate that is attached to the surface of the punch 9 away. After the upper mold 1 is completely reset, the ejection mechanism (such as the ejector block or ejector tube) in the lower mold 10 extends through the lower clearance holes I13 and II to eject the protective plate from the lower mold cavity 11. The operator removes the formed protective plate, thus completing one complete protective plate forming cycle.

[0030] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new energy battery pack lower apron forming die, characterized in that, include: The upper mold (1) and the lower mold (10) are provided with a plurality of punches (9) spaced apart along the outline of the guard plate on the lower end edge of the upper mold (1). Each punch (9) has a spring hole (902) at its axial center. A spring and an ejector pin are fitted into the spring hole (902). One end of the spring abuts against the bottom of the spring hole (902) and the other end is fixedly connected to one end of the ejector pin. The other end of the ejector pin extends out of the spring hole (902) and is used to push the ejector pin to separate the forming guard plate from the surface of the punch (9) by the elastic force of the spring when the mold is opened, so as to achieve uniform mold opening and avoid deformation of the guard plate. The lower end face of the upper mold (1) and the upper end face of the lower mold (10) are respectively provided with exhaust grooves. The exhaust grooves are connected to the forming cavities of the upper mold (1) and the lower mold (10) to quickly discharge the compressed air and metal chips in the cavity during the stamping process, so as to prevent the protective plate from wrinkling, denting and bubbles.

2. The new energy battery pack lower guard plate forming die according to claim 1, characterized in that: The venting groove of the upper mold (1) includes an upper venting groove I (5). There are two sets of upper venting grooves I (5). The two sets of upper venting grooves I (5) are respectively set along the left and right edges of the upper mold (1) to vent the air in the cavity near the punches (9) on both sides of the upper mold (1). Each end of the channel of the upper venting groove I (5) is provided with an upper clearance hole I (6). The upper clearance hole I (6) is connected to the channel of the upper venting groove I (5).

3. The new energy battery pack lower guard plate forming die according to claim 2, characterized in that: The venting groove of the upper mold (1) also includes an upper venting groove II (7). The upper venting groove II (7) is located in the middle forming area of ​​the upper mold (1). The upper venting groove II (7) has a "well" shaped structure. Its horizontal grooves and vertical grooves are perpendicular to each other and connected to form a covering venting mesh structure. Each end of the groove of the upper venting groove II (7) is provided with an upper clearance hole II (8). The upper clearance hole II (8) is connected to the groove of the upper venting groove II (7).

4. The new energy battery pack lower guard plate forming die according to claim 3, characterized in that: The venting groove of the lower mold (10) includes a lower venting groove I (12). There are two sets of lower venting grooves I (12). The two sets of lower venting grooves I (12) are respectively set along the left and right edges of the lower mold (10). The lower venting grooves I (12) and the upper venting grooves I (5) are staggered in the horizontal direction to avoid the venting grooves blocking each other when the upper and lower molds are closed, which would cause the venting passage to be blocked. The lower venting grooves I (12) are connected to the outer edge of the lower mold (10). Each branch end of the lower venting grooves I (12) is provided with a lower clearance hole I (13).

5. The new energy battery pack lower guard plate forming die according to claim 4, characterized in that: The venting groove of the lower mold (10) also includes a lower venting groove II (14). The lower venting groove II (14) is located in the middle forming area of ​​the lower mold (10). The lower venting groove II (14) has a "M" shaped structure. Its channel is divided into a transverse main groove and a longitudinal support groove. The longitudinal support groove is perpendicularly connected to the transverse main groove and is set in segments. There is a gap between two adjacent sets of longitudinal support grooves so that the lower venting groove II (14) is broken in the middle, forming two independent venting branches. Each branch end of the lower venting groove II (14) is provided with a lower clearance hole II (15).

6. The new energy battery pack lower guard plate forming die according to claim 1, characterized in that: The four corners of the lower end face of the upper mold (1) and the four corners of the upper end face of the lower mold (10) are respectively provided with a profile (2), and the profile (2) is a smooth planar structure that is compatible with each other.

7. The new energy battery pack lower guard plate forming die according to claim 1, characterized in that: The upper and lower edges of the upper mold (1) and the lower mold (10) are respectively fixedly equipped with guide rods (3). The guide rods (3) are cylindrical structures, and the guide rods (3) of the upper mold (1) and the guide rods (3) of the lower mold (10) correspond one-to-one, and the axes of the corresponding guide rods (3) are collinear.

8. The new energy battery pack lower guard plate forming die according to claim 1, characterized in that: The punch (9) has mounting holes (901) on both sides. The mounting holes (901) are countersunk holes and bolts are inserted into the mounting holes (901).

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