Punching die and punching equipment

Abstract

The utility model discloses a punching die and punching equipment, belongs to the field of lithium battery punching equipment, and discloses a punching die and punching equipment, which belong to the field of lithium battery punching equipment and comprise a first die and a second die. At least one first male die is arranged on the first die; the second die is provided with first female dies corresponding to the first male dies in a one-to-one mode. The first male die and the first female die are matched to extrude and punch a material film located between the first male die and the first female die so that the material film can form a containing cavity. The edge position of the first male die protrudes to form a punching convex part; the edge position of the first female die is sunken to form a punching concave part corresponding to the punching convex part; the punching convex part is matched with the punching concave part, and the edge of the accommodating cavity is punched to form a reinforcing part. According to the utility model, the structural strength of the accommodating cavity punched by the material film can be improved, the accommodating cavity is ensured to be flat and beautiful, and the tolerance value of thickness detection after packaging can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery punch equipment field, concretely relates to a punch die and punch equipment. BACKGROUND

[0002] With the development of electronic products to light and thin, high performance direction, lithium battery as the key energy storage components, its size, weight and performance optimization is particularly important. In the manufacturing process of lithium battery, the battery cell is wrapped and sealed by the aluminum plastic film packaging shell to ensure the safety and stability of the battery cell. This aluminum plastic film packaging shell is often designed as a structure with a pit to adapt to the shape of the battery cell and provide necessary protection. To achieve this goal, the punch process is usually used on the production line to process the aluminum plastic film raw material into a single packaging shell with a pit, that is, the shell punching process.

[0003] In the aluminum plastic film punching process, due to the strong local pressure of the punching area of the aluminum plastic film by the punching die, the film part located around the punching area is prone to wrinkle deformation, and even the corners are pulled apart. Not only affects the strength and forming effect of the containing cavity structure formed by the aluminum plastic film, resulting in the appearance of the containing cavity not being beautiful enough, the bottom surface not being flat enough, but also leads to the lithium battery product after the subsequent packaging of the battery cell being discarded due to the poor quality of the shell, resulting in the reduction of product qualification rate and the increase of production cost.

[0004] The utility model patent with the application number CN202120836961.1 discloses an aluminum plastic film punching device, which sets a rounded corner structure on the head edge of the punch to avoid the damage of the aluminum plastic film corner position during the punching process. However, since the aluminum plastic film itself has certain rebound characteristics, although this patent can ensure that the corner position is not damaged, it does not solve the problem of the uneven bottom surface of the punched containing cavity, and the structural strength of the containing cavity is low. Due to the poor punching effect, when the battery cell is packaged in the shell made of aluminum plastic film, the thickness of the lithium battery product is affected by the uneven plane, resulting in low thickness detection accuracy and large thickness tolerance value, which is difficult to meet the increasingly strict product quality control requirements. Therefore, it is necessary to propose a punch die and punch equipment to overcome the defects of the aluminum plastic film, such as the large tolerance value of the subsequent thickness detection of the lithium battery product due to the uneven bottom surface of the punched containing cavity. UTILITY MODEL CONTENTS

[0005] The utility model discloses a punch mould and punch equipment are provided to solve the problem that the bottom surface of the containing cavity of the aluminum plastic film is not flat enough, which leads to a large tolerance value in the subsequent thickness detection of the lithium battery product. To realize a punch mould, comprising a first mould and a second mould; At least one first punch is arranged on the first mould; A first recessed die corresponding to the first punch is arranged on the second mould; The first punch and the first recessed die cooperate to extrude and punch the material film between them to form a containing cavity; The edge position of the first punch is protruded to form a punch convex part; The edge position of the first recessed die is recessed to form a punch concave part corresponding to the punch convex part; The punch convex part and the punch concave part cooperate to punch the edge of the containing cavity to form a reinforcing part.

[0006] As an optional solution, the main body of the first punch and the first recessed die is arranged as a quadrilateral structure; The punch convex part is arranged at the four corner positions of the first punch, and the punch concave part is arranged at the four corner positions of the first recessed die; The punch convex part and the punch concave part are arranged as a conical structure or a multi-prism structure.

[0007] As an optional solution, the punch convex part or the punch concave part is a triangular prism structure, which comprises three first prism inclined surfaces and a first plane connected with the three first prism inclined surfaces; At the corner position of the first punch, the three first prism inclined surfaces are protruded and surround the first plane to form the punch convex part, or at the corner position of the first recessed die, the three first prism inclined surfaces are recessed and surround the first plane to form the punch concave part.

[0008] As an optional solution, a first reinforcing rib is arranged at the connection between the first plane and the first prism inclined surface and the connection between any two first prism inclined surfaces.

[0009] As an optional solution, a first machining plane is further arranged on the first punch, which is used to contact one side surface of the material film during punching; The four punch convex parts are respectively arranged at the four corners of the first machining plane and are symmetrically arranged along the central axis of the first machining plane; A second machining plane corresponding to the first machining plane is arranged on the first recessed die, which is used to contact the surface of the other side of the material film during punching; The four punch concave parts are respectively arranged at the four corners of the second machining plane and are symmetrically arranged along the central axis of the second machining plane.

[0010] As an optional solution, the first punch further comprises a plurality of first machining bevels, and the plurality of first machining bevels surround the first machining plane to form a trapezoidal punch; and the first recess further comprises a plurality of second machining bevels corresponding to the first machining bevels, and the plurality of second machining bevels surround the second machining plane to form a trapezoidal recess.

[0011] As an optional solution, each of the first machining bevels is arranged at an obtuse angle with the first machining plane, and each of the second machining bevels is arranged at an obtuse angle with the second machining plane.

[0012] As an optional solution, a second reinforcing rib is arranged at a connection between the first machining plane and the first machining bevel or between any two first machining bevels; and a third reinforcing rib is arranged at a connection between the second machining plane and the second machining bevel or between any two second machining bevels.

[0013] As an optional solution, the accommodating cavity comprises a working plane and a plurality of working bevels, the plurality of working bevels surround the working plane to form the accommodating cavity, and the reinforcing part is formed on the working plane.

[0014] A punching device comprises at least one punching die and a material film to be processed.

[0015] The punching die and the punching device have the following beneficial effects:

[0016] The utility model discloses a kind of punching die and punching equipment, belong to lithium battery punching equipment field, including first mould and second mould;At least one first punch is equipped on the first mould;Corresponding first recess of first punch is equipped on the second mould;The first punch and the first recess cooperation extrude and punch the material film between them to make the material film form accommodating cavity;The edge position of the first punch is protruded and formed with punching convex part;The edge position of the first recess is recessed and formed with the punching recess corresponding to punching convex part;The punching convex part and the punching recess cooperation, the edge of the accommodating cavity is punched to form reinforcing part.The utility model can improve the structure strength of accommodating cavity punched by material film, guarantee accommodating cavity flat, beautiful, and can reduce the thickness detection tolerance value after packaging. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure diagram of the punching die of the utility model Figure 1 , including material film of accommodating cavity and reinforcing part punched out;

[0018] Figure 2 It is the structure diagram of the punching die of the utility model Figure 2 , including material film of accommodating cavity and reinforcing part punched out;

[0019] Figure 3 is a structural schematic view of the first die of the utility model;

[0020] Figure 4 is Figure 3 is a partial structural schematic view at structure A in the middle;

[0021] Figure 5 is a structural schematic view of the second die of the utility model;

[0022] In the drawing: 1, first die; 2, second die; 3, punch convex part; 4, punch concave part; 5, first reinforcing rib; 6, second reinforcing rib; 11, first punch; 21, first die; 31, first plane; 32, first inclined plane; 111, first processing plane; 112, first processing inclined plane; 211, second processing plane; 212, second processing inclined plane; 7, working plane; 8, working inclined plane; 9, reinforcing part. DETAILED DESCRIPTION

[0023] The utility model is further explained in detail below in combination with the drawings and specific embodiments, and it can be understood that the specific embodiments described herein are only used to explain the related utility model, and not to limit the utility model.

[0024] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0025] In the utility model, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0026] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the present application will be described in detail below with reference to the embodiments.

[0027] Embodiment one:

[0028] Figure 1 、 Figure 2 The overall structure of the mold in use is shown, Figure 3 and Figure 5 The specific structure of the first mold 1 and the second mold 2 is shown respectively.

[0029] A punching mold, comprising a first mold 1 and a second mold 2, at least one first punch 11 is arranged on the first mold 1, and a first recess 21 corresponding to the first punch 11 is arranged on the second mold 2, and the first punch 11 and the first recess 21 are used to cooperate with each other to extrude and punch the material film between them to form a containing cavity. In actual use, the first mold 1 and the second mold 2 are arranged oppositely, so that the material film is in a tension state and is located between the first mold 1 and the second mold 2, then according to the punching requirement, the first punch 11 of the first mold 1 can be moved towards the first recess 21 of the second mold 2 to punch, or the first recess 21 of the second mold 2 can be moved towards the first punch 11 of the first mold 1 to punch. Specifically, the punching direction can be set as vertical.

[0030] The edge position of the first punch 11 is protruded to form a punching protrusion 3, and the edge position of the first recess 21 is recessed to form a punching recess 4 corresponding to the punching protrusion 3, and when the first mold 1 and the second mold 2 cooperate with each other, the punching protrusion 3 and the corresponding punching recess 4 also cooperate at the same time, so that the material film is punched to form a containing cavity, and the edge of the containing cavity is also punched to form a reinforcing part 9. In addition, the number of the first punch 11 can be set as two or more, so that the material film can be punched to form multiple containing cavities at one time, and the production efficiency is improved.

[0031] The punching mold of the utility model can punch the reinforcing part 9 at the edge of the containing cavity at the same time of punching the containing cavity, and the punching step is simple and fast. By additionally arranging the reinforcing part 9 at the edge of the containing cavity, the material film corner can be directly acted on and additional compression force can be provided during punching, the back shrinkage of the material film itself is overcome, the rebound phenomenon of the bottom of the containing cavity is effectively inhibited, the bottom surface of the punched containing cavity is more flat, the outer surface of the containing cavity is more beautiful, and the punching effect is good. In addition, the punching protrusion 3 and the punching recess 4 corresponding to and cooperating with the punching protrusion 3 are arranged, which can also increase the local and overall rigidity of the mold, which is helpful to reduce the deformation and displacement of the first mold 1 and the second mold 2 during the punching process, ensure the punching position is accurate, and the size precision of the punched containing cavity is higher. Specifically, the material film used for punching can be a material film with certain hardness and deformation ability, such as an aluminum plastic film.

[0032] The main body part of the first punch 11 and the first die 21 is set as a quadrilateral structure, which is used to make the shape of the main body part of the accommodating cavity after the punching similar to a quadrilateral structure. The punching convex part 3 is arranged at the four corner positions of the first punch 11, and the punching concave part 4 is arranged at the four corner positions of the first die 21. Both the punching convex part 3 and the punching concave part 4 are set as a conical structure or a multi-pyramidal structure. Therefore, the four corner positions of the accommodating cavity after the punching are in a conical structure or a multi-pyramidal structure.

[0033] Preferably, the punching convex part 3 or the punching concave part 4 is in a triangular pyramidal structure. Figure 4 The specific structure of the punching convex part 3 is also shown. The triangular pyramidal structure includes three first pyramidal inclined surfaces 32 and a first plane 31 connected with the three first pyramidal inclined surfaces 32. The three first pyramidal inclined surfaces 32 are used as the side surface of a prism structure, and the first plane 31 is used as the upper base surface. At the corner positions of the first punch 11, the three first pyramidal inclined surfaces 32 are protruded and surround the first plane 31 to form the punching convex part 3. Alternatively, at the corner positions of the first die 21, the three first pyramidal inclined surfaces 32 are recessed and surround the first plane 31 to form the punching concave part 4. The punching convex part 3 or the punching concave part 4 is set as a triangular pyramidal structure because the stability of the triangular structure is strong, which can increase the structural strength of the accommodating cavity after the punching and better resist the retraction force of the material film. The upper base surface of the triangular pyramidal structure is set as a plane to effectively prevent the deformation, scratches or damage of the material film after the punching during the transportation and transfer due to the unnecessary collision or interference between the central part of the bottom surface of the accommodating cavity and other components, thereby ensuring the quality and appearance of the product. In addition, the first plane 31 can also be used as a stable support surface to provide bottom support for the material film after the punching.

[0034] Preferably, the first plane 31 can be set as a triangular plane, and the first pyramidal inclined surface 32 can be set as a trapezoidal inclined surface to form a closed triangular pyramidal structure. In addition, the two side edges of each trapezoidal inclined surface gradually converge in the direction close to the first plane 31, so that the upper base surface of the triangular pyramidal structure is smaller than the lower base surface. The triangular pyramidal structure can better disperse the rebound force from the material film, effectively reduce stress concentration, thereby improving the structural stability of the accommodating cavity after the punching of the material film. Without affecting the product packaging, the shape of the first plane 31 can be adaptively adjusted according to the production requirements. The first plane 31 is preferably set as a triangular plane because the triangle is one of the most stable geometric shapes, which can further improve the overall structural stability compared with other shapes, thereby improving the structural stability of the material film after the punching. In addition, the triangular plane can also reduce the use of unnecessary materials and reduce the manufacturing difficulty and production cost of the mold.

[0035] The connection between the first plane 31 and the first pyramidal inclined surface 32 and the connection between any two first pyramidal inclined surfaces 32 are provided with first reinforcing ribs 5, which form a first arc-shaped convex surface with a circular arc transition at the connection between the first plane 31 and the first pyramidal inclined surface 32 and the connection between any two first pyramidal inclined surfaces 32, which can effectively reduce the stress concentration phenomenon in the punching process, thereby preventing the angle position of the bottom of the accommodation cavity from being damaged due to excessive local pressure during the punching process, and improving the production qualification rate of the product. On the other hand, it also enables the punching convex part 3 of the first mold 1 to maintain good structural integrity and performance stability during a long-time and high-strength punching process, which helps to prolong the service life of the first mold 1 and the second mold 2.

[0036] Embodiment two:

[0037] Including the content as described in embodiment one, the first punch 11 is further provided with a first machining plane 111, which is a horizontal plane for contacting the side surface of the material film during punching. The four punching convex parts 3 are respectively arranged on the four corner edges of the first machining plane 111 and are symmetrically arranged along the central axis of the first machining plane 111. Similarly, the four punching concave parts 4 are respectively arranged on the four corner edges of the second machining plane 211 and are symmetrically arranged along the central axis of the second machining plane 211, so that the four reinforcing parts 9 of the accommodation cavity after punching of the material film are symmetrical, so as to improve the structural stability of the bottom of the accommodation cavity after punching, and make the bottom surface of the accommodation cavity more flat.

[0038] The first punch 11 further includes a plurality of first machining inclined surfaces 112, which are used as side surfaces to form a trapezoidal body punch around the first machining plane 111 as the upper bottom surface. The protruding direction of the trapezoidal body punch is adaptively set according to the punching direction and the relative position of the first mold 1 located on the second mold 2, for example, the first mold 1 is located above the second mold 2, and the punching direction is vertical, then the protruding direction of the trapezoidal body punch is vertical downward.

[0039] The first punch 11 further includes a plurality of first machining inclined surfaces 112, which are used as side surfaces to form a trapezoidal body punch around the first machining plane 111 as the upper bottom surface. The protruding direction of the trapezoidal body punch is adaptively set according to the punching direction and the relative position of the first mold 1 located on the second mold 2, for example, the first mold 1 is located above the second mold 2, and the punching direction is vertical, then the protruding direction of the trapezoidal body punch is vertical downward.

[0040] Preferably, the number of trapezoidal body punch dies on the first mold 1 is two, and the two trapezoidal body punch dies are arranged in parallel along the length direction of the first mold 1. Due to the mechanical error in each time of stamping, the first mold 1 is provided with two first punch dies 11, which not only helps to improve the production efficiency and reduce the accumulation of overall error during stamping, but also, for the lithium battery production process, the two accommodation cavities punched at the same time can be used as two shell halves to form a complete lithium battery shell subsequently, thereby ensuring the production consistency of the lithium battery shell and facilitating the improvement of the subsequent packaging quality.

[0041] Each of the first machining bevels 112 is arranged at an obtuse angle with the first machining plane 111, so that the width of the trapezoidal body punch die gradually narrows in the direction close to the first machining plane 111, which helps to disperse the local pressure during stamping and ensures that the material film will not be torn during stamping. Similarly, each of the second machining bevels 212 is arranged at an obtuse angle with the second machining plane 211, so that the width of the trapezoidal body punch die gradually narrows in the direction close to the first machining plane 111, so as to cooperate with the shape of the trapezoidal body punch die.

[0042] Further, the connection between the first machining plane 111 and the first machining bevel 112 and the connection between any two first machining bevels 112 are provided with second reinforcing ribs 6; the connection between the second machining plane 211 and the second machining bevel 212 and the connection between any two second machining bevels 212 are provided with third reinforcing ribs, the second reinforcing ribs 6 are arranged to form a second arc-shaped convex surface with a circular arc transition at the connection between the first machining plane 111 and the first machining bevel 112 and the connection between any two first machining bevels 112, and the third reinforcing ribs are arranged to form an arc-shaped concave surface with a circular arc transition at the connection between the second machining plane 211 and the second machining bevel 212 and the connection between any two second machining bevels 212, which can effectively reduce the stress concentration phenomenon occurring during stamping, prevent the material film from being damaged at other corners of the accommodation cavity due to excessive local pressure during stamping, further improve the pass rate of the product, and further ensure the service life of the first mold 1 and the second mold 2, and reduce the production interruption and maintenance cost caused by mold damage.

[0043] After the material film is stamped, the formed accommodation cavity includes a working plane 7 and a plurality of working bevels 8, for example, the accommodation cavity includes one working plane 7 and four working bevels 8, and the four working bevels 8 surround the working plane 7 to form a quadrilateral structure accommodation cavity, and the reinforcing part 9 is protruded on the four corners of the working plane 7 to improve the rigidity of the overall structure of the accommodation cavity.

[0044] Preferably, the first die 1 is adaptively arranged as an upper die, and the second die 2 is arranged as a lower die below the first die 1. In addition, the first die 1 can also be arranged as an upper die and the second die 2 can be arranged as a lower die according to actual production needs or equipment needs.

[0045] Embodiment three:

[0046] A punching device comprises the punching die as described in Embodiment two and a material film used for the first die 1 and the second die 2 to cooperate to punch out a containing cavity, wherein the material film can be arranged as an aluminum plastic film. The aluminum plastic film is used as a raw material of a lithium battery shell to package a battery cell after punching to form a soft-pack lithium battery product. By using the punching die as described in Embodiment two, the strength of the corner structure of the containing cavity formed when the aluminum plastic film is punched is improved, and the bottom surface of the containing cavity is more flat and beautiful. After the battery cell packaging process, since both sides of the lithium battery shell are more flat, the accuracy of the thickness detection of the lithium battery product is also improved, the accuracy and reliability of the detection result are guaranteed, the tolerance value of the thickness detection is reduced, the detection accuracy is improved, and the increasingly strict quality control requirements of the lithium battery product are met.

[0047] The above description is only preferred embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, which is based on the content of the present application specification and drawings, is also included in the patent protection range of the present application.

Claims

1. A punching die, characterized in that: It comprises a first mold (1) and a second mold (2); The first die (1) is provided with at least one first convex die (11); the second die (2) is provided with a first concave die (21) corresponding to the first convex die (11); the first convex die (11) and the first concave die (21) cooperate to extrude and punch the material film between the two so that the material film forms a receiving cavity; The edge of the first convex mold (11) is convex to form a punching convex portion (3); the edge of the first concave mold (21) is concave to form a punching concave portion (4) corresponding to the punching convex portion (3); the punching convex portion (3) cooperates with the punching concave portion (4) to punch the edge of the accommodating cavity to form a reinforcement portion (9).

2. The punching die according to claim 1, characterized in that: The main bodies of the first punch (11) and the first die (21) are both arranged as quadrilateral structures; the punch-shaped convex portion (3) is arranged at the four corners of the first punch (11), and the punch-shaped concave portion (4) is arranged at the four corners of the first die (21); the punch-shaped convex portion (3) and the punch-shaped concave portion (4) are both arranged as conical structures or as polygonal pyramid structures.

3. The punching die according to claim 2, characterized in that: The punch-shaped convex portion (3) or the punch-shaped concave portion (4) is a triangular pyramid structure, and the triangular pyramid structure includes three first pyramid oblique surfaces (32) and a first plane (31) connecting the three first pyramid oblique surfaces (32); At the corner positions of the first convex mold (11), the three first pyramidal inclined surfaces (32) are raised and surround the first plane (31) to form the punch-shaped convex portion (3); or, at the corner positions of the first concave mold (21), the three first pyramidal inclined surfaces (32) are recessed and surround the first plane (31) to form the punch-shaped concave portion (4).

4. The punching die according to claim 3, characterized in that: A first reinforcing rib (5) is provided at the connection between the first plane (31) and the first pyramid oblique surface (32) and at the connection between any two of the first pyramid oblique surfaces (32).

5. The mold according to claim 2, characterized in that: The first punch (11) is also provided with a first processing plane (111), and the first processing plane (111) is used to contact one side surface of the material film during punching; the four punching convex parts (3) are respectively provided on the four corners of the first processing plane (111), and are symmetrically arranged along the central axis of the first processing plane (111); The first die (21) is provided with a second processing plane (211) corresponding to the first processing plane (111), and the second processing plane (211) is used to contact the surface of the other side of the material film during punching; the four punching recesses (4) are respectively provided on the four corners of the second processing plane (211), and are symmetrically arranged along the central axis of the second processing plane (211).

6. The punching die according to claim 5, characterized in that: The first punch (11) further comprises a plurality of first processing inclined surfaces (112), wherein the plurality of first processing inclined surfaces (112) surround the first processing plane (111) to form a trapezoidal punch; The first concave mold (21) further comprises a plurality of second processing inclined surfaces (212) corresponding to the first processing inclined surfaces (112), and the plurality of second processing inclined surfaces (212) surround the second processing plane (211) to form a trapezoidal concave mold.

7. The punching die according to claim 6, characterized in that: Each of the first processing bevels (112) is arranged at an obtuse angle with the first processing plane (111), and each of the second processing bevels (212) is arranged at an obtuse angle with the second processing plane (211).

8. The punching die according to claim 6, characterized in that: A second reinforcing rib (6) is provided at the connection between the first processing plane (111) and the first processing inclined surface (112) and at the connection between any two of the first processing inclined surfaces (112); A third reinforcing rib is provided at the connection between the second processing plane (211) and the second processing inclined surface (212) and at the connection between any two of the second processing inclined surfaces (212).

9. The punching die according to claim 1, wherein: The accommodating cavity comprises a working plane (7) and a plurality of working inclined surfaces (8), wherein the plurality of working inclined surfaces (8) surround the working plane (7) to form the accommodating cavity, and the reinforcing portion (9) is formed protruding from the working plane (7).

10. A punching device, characterized in that: The invention comprises the punching die according to any one of claims 1 to 9 and a material film to be processed; the material film is an aluminum-plastic film.

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