CN111605169B

CN111605169B - Wrinkle-making die, method for manufacturing soft-package button cell and soft-package button cell

Info

Publication number: CN111605169B
Application number: CN202010489463.4A
Authority: CN
Inventors: 刘承香; 温松江
Original assignee: Luhua Zhifu Electronics Shenzhen Co ltd
Current assignee: Luhua Zhifu Electronics Shenzhen Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2022-06-14
Anticipated expiration: 2040-06-02
Also published as: CN111605169A

Abstract

The invention provides a wrinkle-making die, a method for manufacturing a soft-package button cell and the soft-package button cell, wherein the wrinkle-making die comprises an upper die and a lower die, the bottom of the upper die is provided with an upper concave hole and an upper punching surface, the upper punching surface is arranged in a convex manner, and the upper punching surface is provided with a groove; the top of the lower die is provided with a lower concave hole and a lower punching surface, the lower punching surface is arranged in a concave manner, and the lower punching surface is provided with convex teeth. The wrinkle forming die can stamp the initial hem of the battery into the stamped hem, the stamped hem and the initial hem form a set inclination angle, and the radial length of the stamped hem is greater than that of the initial hem, so that a stamped wrinkle with a smaller size is formed only by stamping, the wrinkle forming depth is shallow, the stretching of a seal of an aluminum-plastic film is small, the influence on the sealing performance of the seal is small, liquid leakage can be prevented, the stamped hem can shrink along the stamped wrinkle to form a uniform folded wrinkle in the stamping and folding process of the stamped hem, the uniform folded wrinkle cannot occupy more space in the diameter direction of a battery core, and the capacity of the battery is favorably improved.

Description

Wrinkle-making die, method for manufacturing soft-package button cell and soft-package button cell

Technical Field

The invention relates to the field of molds, in particular to a wrinkle-making mold, a method for manufacturing a soft-package button cell and the soft-package button cell.

Background

The battery has small volume and can store more electricity, so the battery is widely used in daily life. Wherein laminate polymer battery is a battery that adopts plastic-aluminum membrane packing, its light in weight, and capacious, and laminate polymer battery can only blow out and split at most under the condition that takes place the potential safety hazard, is difficult to explode. However, in the prior art, the initial folded edge in the radial state of the soft package battery needs to be bent to form a bent folded edge in the axial state, and the bent folded edge is wrapped on the side face of the soft package battery, wherein in the bending and wrapping process, the circumferential length of the initial folded edge is reduced, so that a large-size bent fold can be formed on the bent folded edge, the sealing of the aluminum-plastic film is greatly stretched, the sealing tightness of the sealing is affected, and the risk of liquid leakage is caused.

Therefore, it is necessary to provide a wrinkle-forming mold to solve the above technical problems.

Disclosure of Invention

The invention provides a wrinkle-making die, which is characterized in that one side of an inner ring of an upper pressing surface is arranged in a convex manner, a lower pressing surface is arranged in a concave manner corresponding to the upper pressing surface, so that an initial folded edge of a battery can be punched into a punched folded edge, the punched folded edge and the initial folded edge form a set inclination angle, and the radial length of the punched folded edge is greater than the radial length of the initial folded edge, so that only a punched fold with a smaller size is formed by punching, the wrinkle-making depth is shallow, the stretching of a seal of an aluminum plastic film is small, and the influence on the sealing performance of the seal is small, and the problem that the initial folded edge in the radial state of a soft package battery in the prior art is bent to form a bent folded edge in the axial state, the bent folded edge is covered on the side surface of the soft package battery, the circumferential length of the initial folded edge is reduced in the covering process, the bent fold with a larger size can be formed on the folded edge, the larger stretching of the seal of the aluminum plastic film is caused, and the sealing performance of the seal is influenced, leading to the problem of the risk of leakage.

In order to solve the technical problems, the technical scheme of the invention is as follows: a wrinkle-making mould comprises an upper mould and a lower mould;

the bottom of the upper die is provided with an upper concave hole, the periphery of the upper concave hole is provided with an upper stamping surface, one side of an inner ring of the upper stamping surface is convexly arranged, and a plurality of grooves are annularly distributed on the upper stamping surface;

the top of lower mould is provided with down the shrinkage pool, the periphery of shrinkage pool is provided with down the stamping surface down, down the stamping surface correspond the last stamping surface becomes the indent setting, be provided with on the stamping surface down with the corresponding dogtooth of recess, the width direction's of dogtooth cross section is triangle-shaped.

In the invention, a radial plane where the outer edge of the upper stamping surface is located is taken as a reference plane, and the upper stamping surface and the reference plane form a convex inclination angle of 0-60 degrees.

In the invention, the convex teeth comprise a first side surface and a second side surface, the first side surface and the lower stamping surface form a first included angle, the second side surface and the lower stamping surface form a second included angle, and the first included angle is equal to the second included angle.

In the invention, the convex teeth comprise a first side surface and a second side surface, the first side surface and the lower stamping surface form a first included angle, the second side surface and the lower stamping surface form a second included angle, and the first included angle and the second included angle are different.

Further, the first included angle is between 110 degrees and 140 degrees, and the second included angle is between 90 degrees and 120 degrees.

In the invention, the width of the convex teeth is gradually reduced and the tooth height of the convex teeth is gradually reduced along the direction that the outer side edge of the lower punching surface points to the lower concave hole.

In the invention, 10-16 convex teeth are annularly distributed on the lower punching surface, and the distance between the adjacent convex teeth is equal.

In the invention, the upper die comprises an upper mounting plate and an upper stamping body, the upper mounting plate is connected to the top of the upper stamping body, the upper stamping surface is arranged at the bottom of the upper stamping body, and strip-shaped upper mounting holes are formed in four corners of the upper mounting plate;

the lower mould includes lower mounting panel and lower punching press body, the mounting panel is connected down the top of lower punching press body, down the plane setting of punching press is in the bottom of lower punching press body, the lower mounting hole of rectangular shape is provided with in the four corners of lower mounting panel.

The upper concave hole penetrates through the upper punching body, two opposite side surfaces of the upper punching body are provided with upper through grooves, the upper through grooves are communicated with the upper concave hole and an external space, and the upper through grooves penetrate through the upper punching surface;

the lower concave hole penetrates through the lower punching body, two opposite side faces of the lower punching body are provided with lower through grooves, the lower through grooves are communicated with the lower concave hole and the external space, and the lower through grooves penetrate through the lower punching surface.

Go up the mounting panel with go up the punching press body and be the integrated into one piece structure, down the mounting panel with the punching press body is the integrated into one piece structure down.

The invention also comprises a method for manufacturing the soft-package button cell by using the wrinkle-making die, wherein the soft-package button cell comprises an upper aluminum-plastic film, a lower aluminum-plastic film, a cell, a positive electrode tab and a negative electrode tab, and the method comprises the following steps:

step S11: connecting a first end of a positive electrode lug with the battery cell, and connecting a first end of a negative electrode lug with the battery cell;

step S12: packaging the battery cell between the upper aluminum-plastic film and the lower aluminum-plastic film, wherein the second end of the positive electrode tab extends out to the outside, and the second end of the negative electrode tab extends out to the outside;

step S13: laminating, hot-pressing and sealing the edge of the upper aluminum-plastic film and the edge of the lower aluminum-plastic film to form a sealed battery, and laminating and connecting the edge of the upper aluminum-plastic film and the edge of the lower aluminum-plastic film to form an initial folded edge;

step S14: placing the sealed battery between an upper die and a lower die for stamping, wherein the initial folded edge is stamped into a stamped folded edge, the initial folded edge is at a set inclination angle relative to the stamped folded edge, a stamped fold is formed on the stamped folded edge, and the cross section of the stamped fold in the width direction is in a V shape;

the stamping folds comprise a first fold side face and a second fold side face, the first fold side face and the folded edge are in a first stamping angle, the second fold side face and the folded edge are in a second stamping angle, and the first stamping angle is different from the second stamping angle.

Step S15: and bending the stamping folded edge to form a bending folded edge, wherein the bending folded edge is coated on the side surface of the soft package button cell, the stamping folded edge is contracted along the stamping fold to form a bending fold, and the bending fold is folded and coated on the side surface of the soft package button cell through bending.

Further, the step S11 further includes:

step S21: and bending the positive electrode lug to form a positive electrode bent part, connecting the positive electrode bent part between the first end and the second end of the positive electrode lug, bending the negative electrode lug to form a negative electrode bent part, and connecting the negative electrode bent part between the first end and the second end of the negative electrode lug.

The first end and the second end of the positive electrode tab form an included angle of 88-93 degrees, and the first end and the second end of the negative electrode tab form an included angle of 88-93 degrees.

In addition, the step S12 further includes:

step S31: go up the punching press on the plastic-aluminum membrane and form holding tank, the internal diameter that goes up the holding tank and be close to opening one end is greater than the internal diameter of the other end, and the punching press forms holding tank down on the plastic-aluminum membrane down, the internal diameter that the holding tank is close to opening one end is greater than the internal diameter of the other end down.

The invention also comprises a soft-package button cell manufactured by using the wrinkle-making die, which comprises an upper aluminum-plastic film, a lower aluminum-plastic film, a cell, a positive electrode tab and a negative electrode tab;

the battery core is arranged between the upper aluminum-plastic film and the lower aluminum-plastic film, the upper aluminum-plastic film and the lower aluminum-plastic film are in sealing connection through a bending folded edge, the bending folded edge is coated on the side face of the soft package button battery, the bending folded edge is formed by radially stretching and bending an initial folded edge, a bending fold is arranged on the bending folded edge, the bending fold is formed by shrinking a stamping folded edge along the stamping fold, and the bending fold is overlapped and coated on the side face of the soft package button battery through bending;

one end of the positive electrode lug is connected with the battery cell, the other end of the positive electrode lug penetrates through the bending folded edge and extends out, one end of the negative electrode lug is connected with the battery cell, and the other end of the negative electrode lug penetrates through the bending folded edge and extends out.

The periphery of the upper aluminum-plastic film and the periphery of the lower aluminum-plastic film are connected in a laminated mode to form an initial folded edge, the initial folded edge is punched through the wrinkle forming die to form a punching folded edge, the initial folded edge and the punching folded edge form a set inclination angle, the radial length of the punching folded edge is larger than that of the initial folded edge, meanwhile, punching wrinkles formed on the punching folded edge in a punching mode are formed, the cross section of the punching wrinkles in the width direction is V-shaped, and in the punching folded edge bending process, the punching folded edge can shrink along the punching wrinkles to form uniform bending wrinkles.

Compared with the prior art, the invention has the beneficial effects that: according to the wrinkle-making die, one side of the inner ring of the upper pressing surface is arranged in a protruding mode, the lower pressing surface is arranged in a concave mode corresponding to the upper pressing surface, so that the initial folded edge of a battery can be punched into the punching folded edge, the punching folded edge and the initial folded edge form a set inclination angle, the radial length of the punching folded edge is larger than that of the initial folded edge, and therefore only punching is needed to form a punching wrinkle with a smaller size.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments are briefly introduced below, and the drawings in the following description are only corresponding to some embodiments of the present invention.

Figure 1 is a schematic structural view of a preferred embodiment of the creasing die of the present invention.

Fig. 2 is a partially enlarged view of the upper punch.

Fig. 3 is a partially enlarged view of the upper punch in the front view direction.

Fig. 4 is a partially enlarged view of the lower punch.

Fig. 5 is a schematic cross-sectional view in the width direction of the convex teeth.

Fig. 6 is a schematic cross-sectional view in the width direction of another form of tooth.

Fig. 7 is a schematic structural diagram of a soft-pouch button cell after stamping an initial folded edge to form a stamped folded edge.

Fig. 8 is a cross-sectional view of the battery prior to stamping to create wrinkles.

Fig. 9 is an enlarged view of a portion of the structure of the punched flange and the punched corrugation.

Fig. 10 is a flow chart of a method of manufacturing a pouch button cell using a crimping die.

The reference numbers are named as follows:

an upper mounting plate 11, an upper mounting hole 111; an upper punch 12; upper punch surface 121, groove 122; an upper recess hole 123; an upper through groove 124; a lower mounting plate 13; a lower mounting hole 131; a lower punch 14,; lower punch face 141; the convex teeth 142; a lower recess 143; a lower through groove 144; a soft-package button cell 15; an aluminum plastic film 151 is coated; an upper receiving groove 1511; a lower aluminum plastic film 152; a lower accommodation groove 1521; the initial folded edge 153 a; the stamped fold 153 b; pressing pleats 154; a positive electrode tab 155; a positive electrode bent portion 1551; a negative electrode tab 156; a negative electrode bent portion 1561; an electrical core 157; first included angle a 1; a second included angle A2; a first punching angle B1; a second punch angle B2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom" are used only with reference to the orientation of the drawings, and the directional terms are used for illustration and understanding of the present invention, and are not intended to limit the present invention.

The terms "first," "second," and the like in the terms of the invention are used for descriptive purposes only and not for purposes of indication or implication relative importance, nor as a limitation on the order of precedence.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., the connection may be a detachable connection or a connection in a unitary structure; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In prior art, need buckle the initial hem of laminate polymer battery radial state and form the hem of buckling of axial state, buckle the hem cladding to laminate polymer battery's side on, wherein at the cladding in-process of buckling, the circumference length of initial hem reduces, can form the great fold of buckling of size on the hem of buckling, causes great drawing to sealing of plastic-aluminum membrane, influences the leakproofness of sealing, leads to having the risk of weeping.

The following is a preferred embodiment of the creasing die provided by the present invention that solves the above technical problems.

Referring to fig. 1, fig. 2 and fig. 4, wherein fig. 1 is a schematic structural view of a preferred embodiment of the wrinkle making mold of the present invention, fig. 2 is a partially enlarged view of an upper punching body, and fig. 4 is a partially enlarged view of a lower punching body.

In the drawings, elements having similar structures are denoted by the same reference numerals.

The invention provides a wrinkle-making die, which comprises an upper die and a lower die, wherein the upper die comprises an upper mounting plate 11 and an upper punching body 12, and the lower die comprises a lower mounting plate 13 and a lower punching body 14.

The bottom of the upper die is provided with an upper concave hole 123, the upper concave hole 123 is used for accommodating the soft-package button cell 15, the periphery of the upper concave hole 123 is provided with an upper stamping surface 121, and one side of the inner ring of the upper stamping surface 121 is convexly provided with the upper stamping surface 121 on which a plurality of grooves 122 are annularly distributed.

The upper stamping surface 121 in this embodiment is annular, a circle of the upper stamping surface 121 close to the edge of the upper concave hole is one side of the inner ring, and one side of the inner ring protrudes in a direction away from the upper stamping body 12, so that the upper stamping surface 121 forms an inclined surface as shown in fig. 2.

The top of the lower die is provided with a lower concave hole 143, the lower concave hole 143 is provided with a lower pressing surface 141, the lower pressing surface 141 is recessed corresponding to the upper pressing surface 121, the lower pressing surface 141 is provided with a convex tooth 142 corresponding to the groove 122, please refer to fig. 5, the cross section of the convex tooth 142 in the width direction is triangular.

Referring to fig. 7, the initial folded edge 153a of the soft-package button battery 15 can be stamped into a stamped folded edge 153b in a set inclined state by the stamping of the creasing mold of the present invention, during the stamping process, the initial folded edge 153a generates a certain stretching in the radial direction, so that the radial length of the stamped folded edge 153b is greater than the radial length of the initial folded edge 153a, and therefore, only a stamped fold 154 with a smaller size needs to be stamped, the creasing depth is shallow, the stretching of the seal of the aluminum-plastic film is small, the influence on the sealing performance is small, and liquid leakage can be prevented, during the process of bending the stamped folded edge 153b into a bent folded edge, the stamped folded edge 153b will shrink along the stamped fold 154 to form a uniform folded fold, and the uniform folded fold will not occupy more space in the diameter direction of the battery cell 157, which is beneficial to improving the capacity of the battery.

In the present invention, a radial plane where the outer edge of the upper stamping surface 121 is located is a reference plane, and the upper stamping surface 121 and the reference plane form a convex inclination angle of 0 to 60 degrees, which can be referred to fig. 3, where an included angle C in fig. 3 is a diagonal angle of the convex inclination angle.

In the present invention, the protruding teeth 142 can be in various forms, referring to fig. 5, the protruding teeth 142 include a first side surface and a second side surface, the first side surface and the lower pressing surface 141 form a first included angle a1, the second side surface and the lower pressing surface 141 form a second included angle a2, and the first included angle a1 and the second included angle a2 are equal to each other, so that the uniform pressed wrinkles 154 can be formed by pressing.

Or referring to fig. 6, the first included angle a1 and the second included angle a2 are different, so that after the stamped folding edge 153b is bent, all the stamped folding lines 154 can naturally contract towards the same direction to form folded folding lines, the uniform folded folding lines are wrapped more neatly, and the folded folding lines do not occupy more space in the diameter direction of the battery cell 157, thereby facilitating the increase of the battery capacity.

Wherein the first included angle A1 is between 110 degrees and 140 degrees, and the second included angle A2 is between 90 degrees and 120 degrees.

Referring to fig. 4, along the direction that the outer edge of the lower pressing surface 141 points to the lower concave hole 143, the width of the protruding tooth 142 is gradually reduced, and the tooth height of the protruding tooth 142 is gradually reduced, so that the pressed fold 154 formed by pressing can contract corresponding to the bending of the pressed fold 153b during the bending process of the pressed fold 153 b.

In the present invention, 10-16 convex teeth 142 are annularly distributed on the lower pressing surface 141, the distance between adjacent convex teeth 142 is equal, and the more convex teeth 142 are arranged, the size of the convex teeth 142 can be correspondingly reduced.

In the present invention, the upper mounting plate 11 is connected to the top of the upper punch 12, the upper punch surface 121 is disposed at the bottom of the upper punch 12, and the upper mounting plate 11 has elongated upper mounting holes 111 at four corners thereof for facilitating adjustment and installation of the upper mounting plate 11.

The lower mounting plate 13 is connected to the top of the lower punch 14, the lower punch surface 141 is arranged at the bottom of the lower punch 14, and the lower mounting holes 131 which are long in strip shape are formed in four corners of the lower mounting plate 13 so as to adjust and mount the lower mounting plate 13.

The upper concave hole 123 penetrates through the upper punching body 12, the two opposite side surfaces of the upper punching body 12 are provided with upper through grooves 124, the upper through grooves 124 are communicated with the upper concave hole 123 and the external space, and the upper through grooves 124 penetrate through the upper punching surface 121.

The lower concave hole 143 penetrates through the lower punch 14, two opposite side surfaces of the lower punch 14 are provided with lower through grooves 144, the lower through grooves 144 communicate the lower concave hole 143 with an external space, and the lower through grooves 144 penetrate through the lower punch surface 141.

In the process of punching the soft-package button battery 15 by the wrinkling die, the upper through groove 124 and the lower through groove 144 can form a clearance for the positive electrode tab 155 and the negative electrode tab 156, and the upper through groove 124 and the lower through groove 144 are arranged simultaneously, so that the upper punching body 12 and the lower punching body 14 have expansion allowance, and form flexible punching on the battery.

The upper mounting plate 11 and the upper punch 12 in this embodiment are integrally formed, and the lower mounting plate 13 and the lower punch 14 are integrally formed.

Referring to fig. 10, the present invention further includes a method for manufacturing a soft-package button cell using the above wrinkling mold, where the soft-package button cell 15 includes an upper aluminum-plastic film 151, a lower aluminum-plastic film 152, a battery cell 157, a positive tab 155, and a negative tab 156, and includes the following steps:

step S11: a first end of the positive tab 155 is connected to the cell 157, and a first end of the negative tab 156 is connected to the cell 157.

Step S12: the battery cell 157 is packaged between the upper aluminum plastic film 151 and the lower aluminum plastic film 152, the second end of the positive electrode tab 155 extends to the outside, and the second end of the negative electrode tab 156 extends to the outside, wherein the upper aluminum plastic film 151 and the lower aluminum plastic film 152 can be made into a cylindrical structure with an accommodating groove, so that the battery cell 157 can be installed between the upper aluminum plastic film 151 and the lower aluminum plastic film 152.

Step S13: and laminating, hot-pressing and sealing the edge of the upper aluminum-plastic film 151 and the edge of the lower aluminum-plastic film 152 to form a sealed battery, laminating and connecting the edge of the upper aluminum-plastic film 151 and the edge of the lower aluminum-plastic film 152 to form an initial folding edge 153a, and melting and adhering the upper aluminum-plastic film 151 and the lower aluminum-plastic film 152 at a set temperature. The edge of the upper aluminum-plastic film 151 and the edge of the lower aluminum-plastic film 152 are melted and bonded, and then solidified and bonded to form an initial folded edge 153a after cooling.

Step S14: the sealed battery is placed between the upper die and the lower die for punching, the initial folding edge 153a is punched into a punching folding edge 153b, a punching fold 154 is formed on the punching folding edge 153b, the punching folding edge 153b is at a set inclination angle relative to the initial folding edge 153a, and the cross section of the punching fold 154 in the width direction is in a V shape.

Step S15: bending the stamping folding edge 153b to form a bending folding edge, wherein the bending folding edge is wrapped on the side face of the soft package button cell, the stamping folding edge 153b contracts along the stamping folding lines 154 to form bending folding lines, and the bending folding lines are folded and wrapped on the side face of the soft package button cell through bending.

Further, step S11 further includes:

step S21: the positive electrode tab 155 is bent to form a positive electrode bent portion 1551, the positive electrode bent portion 1551 is connected between the first end and the second end of the positive electrode tab 155, the negative electrode tab 156 is bent to form a negative electrode bent portion 1561, and the negative electrode bent portion 1561 is connected between the first end and the second end of the negative electrode tab 156.

The first end and the second end of the positive pole lug 155 form an included angle of 88-93 degrees, the first end and the second end of the negative pole lug 156 form an included angle of 88-93 degrees, and when the battery cell 157 is packaged between the upper aluminum plastic film 151 and the lower aluminum plastic film 152, the second end of the positive pole lug 155 and the second end of the negative pole lug 156 can conveniently penetrate through and extend out of the folded edge.

Further, step S12 includes:

step S31: referring to fig. 8, an upper receiving groove 1511 is formed on the upper aluminum-plastic film 151 by stamping, an inner diameter of the upper receiving groove 1511 near one end of the opening is larger than an inner diameter of the other end, a lower receiving groove 1521 is formed on the lower aluminum-plastic film 152 by stamping, and an inner diameter of the lower receiving groove 1521 near one end of the opening is larger than an inner diameter of the other end, so that a larger setting space is formed in a butt joint area of the upper aluminum-plastic film 151 and the lower aluminum-plastic film 152, the positive electrode tab 155 and the negative electrode tab 156 are conveniently arranged, and meanwhile, bending of the stamping folding edge 153b is facilitated.

The invention also comprises a soft-package button cell manufactured by using the wrinkle-making mould, which comprises an upper aluminum-plastic film 151, a lower aluminum-plastic film 152, a battery core 157, a positive pole tab 155 and a negative pole tab 156.

The battery core 157 is arranged between the upper aluminum-plastic film 151 and the lower aluminum-plastic film 152, the upper aluminum-plastic film 151 and the lower aluminum-plastic film 152 are in sealing connection through a bending folding edge 153b, the bending folding edge 153b is coated on the side face of the soft-package button battery, the bending folding edge 153b is formed by radially stretching and bending an initial folding edge 153a, a bending fold is arranged on the bending folding edge 153b, the bending fold is formed by shrinking the stamping folding edge 153b along a stamping fold 154, and the bending fold is laminated and coated on the side face of the soft-package button battery through bending.

One end of the positive electrode tab 155 is connected to the battery cell 157, the other end extends out through the bending edge 153b, one end of the negative electrode tab 156 is connected to the battery cell 157, and the other end extends out through the bending edge 153 b.

Specifically, the periphery of the upper aluminum-plastic film 151 and the periphery of the lower aluminum-plastic film 152 are laminated to form an initial folded edge 153a, the initial folded edge 153a is stamped by the wrinkle forming die to form a stamped folded edge 153b, the initial folded edge 153a and the stamped folded edge 153b have a set inclination angle, the radial length of the stamped folded edge 153b is greater than that of the initial folded edge 153a, a stamped fold 154 is stamped on the stamped folded edge 153b, the cross section of the stamped fold 154 in the width direction is in a V shape, and during the bending process of the stamped folded edge 153b, the stamped folded edge 153b can shrink along the stamped fold 154 to form a uniform folded fold.

Wherein, the punching press hem 153b through the initial hem 153a punching press with soft-package button cell 15 becomes the inclination of settlement state, in the punching press process, initial hem 153a produces certain tensile along radial direction, make the radial length of punching press hem 153b be greater than the radial length of initial hem 153a, consequently, only need the punching press to form the littleer punching press fold 154 of size, it is shallow to make the fold degree of depth, it is tensile little to the seal of plastic-aluminum membrane, it is little to the leakproofness influence of sealing, can prevent the weeping, punching press hem 153b is buckled in-process, punching press hem 153b can contract along punching press fold 154 and form even fold, even fold the fold can not occupy the more space of electric core 157 diameter direction, do benefit to the capacity that promotes the battery.

Referring to fig. 9, the pressed wrinkles 154 include a first wrinkle side and a second wrinkle side, the first wrinkle side and the pressed edge 153B form a first pressed angle B1, the second wrinkle side and the pressed edge 153B form a second pressed angle B2, the first pressed angle B1 is equal to the second pressed angle B2, the wrinkle forming die can punch uniform pressed wrinkles 154 on the pressed edge 153B of the battery, during the bending process of the pressed edge 153B, the pressed edge 153B can form uniform bent wrinkles along the pressed wrinkle shrinkage 154, the uniform bent wrinkles do not occupy more space in the diameter direction of the battery cell 157, which is beneficial to improving the capacity of the battery.

Or the first stamping angle B1 and the second stamping angle B2 are different, after the stamping folding edge 153B is bent, all the stamping folds 154 can naturally contract towards the same direction to form uniform folding folds, the uniform folding folds are wrapped more neatly, and the folding folds do not occupy more spaces in the diameter direction of the battery core 157, so that the capacity of the battery is improved.

This crease-making mould of preferred embodiment sets up through the inner ring one side evagination with last stamping surface, stamping surface becomes the indent setting down on the stamping surface correspondence, thereby can become the punching press hem with the initial hem punching press of battery, the punching press hem becomes the settlement angle of inclination with initial hem, the radial length of punching press hem is greater than the radial length of initial hem, consequently, only need the punching press to form the littleer punching press fold of size, it is shallow to make the wrinkle degree of depth, it is tensile little to sealing of plastic-aluminum membrane, it is little to the leakproofness influence of sealing, can prevent the weeping, the punching press hem is buckled the in-process, the punching press hem can form even buckle fold along the punching press fold shrink, even buckle fold can not occupy the more space of electric core diameter direction, do benefit to the capacity that promotes the battery.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. The wrinkle-making die is characterized by comprising an upper die and a lower die;

the top of the lower die is provided with a lower concave hole, the periphery of the lower concave hole is provided with a lower stamping surface, the lower stamping surface is arranged in a concave manner corresponding to the upper stamping surface, the lower stamping surface is provided with a convex tooth corresponding to the groove, the cross section of the convex tooth in the width direction is triangular, the upper die and the lower die stamp the initial folded edge of the soft package button cell into a stamped folded edge, the groove and the convex tooth are matched to form a stamped fold on the stamped folded edge, the width of the convex tooth is gradually reduced along the direction of the outer side edge of the lower stamping surface pointing to the lower concave hole, and the tooth height of the convex tooth is gradually reduced;

the convex teeth comprise a first side face and a second side face, the first side face and the lower punching press face a first included angle, the second side face and the lower punching press face a second included angle, the first included angle and the second included angle are unequal, and therefore after the punching press folded edge is bent, all the punching press folded edges can naturally contract towards the same direction to form bent folded edges.

2. The wrinkle making die as claimed in claim 1, wherein the upper punching surface has a convex inclination angle of 0 ° to 60 ° with respect to a radial plane on which the outer edge of the upper punching surface is located as a reference plane.

3. The wrinkle making die as claimed in claim 1, wherein 10-16 teeth are distributed on the lower punching surface in a ring shape, and the adjacent teeth are spaced at equal intervals.

4. The wrinkle making die according to claim 1, wherein the upper die comprises an upper mounting plate and an upper punching body, the upper mounting plate is connected to the top of the upper punching body, the upper punching surface is arranged at the bottom of the upper punching body, and elongated upper mounting holes are arranged at four corners of the upper mounting plate;

the lower die comprises a lower mounting plate and a lower stamping body, the lower mounting plate is connected to the top of the lower stamping body, the lower stamping surface is arranged at the bottom of the lower stamping body, and strip-shaped lower mounting holes are formed in four corners of the lower mounting plate;

the upper concave hole penetrates through the upper stamping body, two opposite side surfaces of the upper stamping body are provided with upper through grooves, the upper through grooves are communicated with the upper concave hole and an external space, and the upper through grooves penetrate through the upper stamping surface;

5. A method for manufacturing a soft package button cell by using the wrinkling mould of any one of claims 1-4, wherein the soft package button cell comprises an upper aluminum-plastic film, a lower aluminum-plastic film, a cell, a positive electrode tab and a negative electrode tab, and the method is characterized by comprising the following steps of:

step S12: packaging the battery cell between the upper aluminum-plastic film and the lower aluminum-plastic film, wherein the second end of the positive electrode tab extends out to the outside, and the second end of the negative electrode tab extends to the outside;

step S15: and bending the stamping folded edge to form a bending folded edge, wherein the bending folded edge is coated on the side surface of the soft package button cell, the stamping folded edge is contracted to form a bending folded edge, and the bending folded edge is laminated and coated on the side surface of the soft package button cell through bending.

6. The method for manufacturing a soft package button cell by using the crumpling die as claimed in claim 5, wherein the step S11 further comprises:

7. A soft-package button cell manufactured by using the crumpling mould of any one of claims 1-4, which comprises an upper aluminum-plastic film, a lower aluminum-plastic film, a cell, a positive electrode tab and a negative electrode tab;