Method for bending and sealing the edges of soft-pack button batteries

Abstract

The present invention belongs to the technical field of soft-pack batteries and relates to a method for bending and sealing the edges of soft-pack button batteries, comprising obtaining a soft-pack button battery with a heat-sealed edge, wherein the heat-sealed edge extends in the radial direction of the soft-pack button battery; bending the heat-sealed edge in the same direction along the axial direction of the soft-pack button battery at intervals to form a pressing portion, and forming a wrinkle portion between adjacent pressing portions; and pressing the wrinkle portion onto the pressing portion adjacent to the wrinkle portion. By bending the heat-sealed edge in the same direction along the axial direction of the soft-pack button battery at intervals to form a pressing portion, and forming a wrinkle portion between adjacent pressing portions, and pressing the wrinkle portion onto the pressing portion adjacent to the wrinkle portion, the method of pressing the corrugated edge is replaced, thereby avoiding the risk of the embossed seal head damaging the soft packaging film, and also avoiding the problems of poor appearance and poor performance of the soft-pack button battery caused by corrugation.

Description

Technical Field

[0001] The present invention belongs to the technical field of soft-pack batteries, and in particular relates to a method for bending and sealing edges of soft-pack button batteries. Background Art

[0002] Soft-pack button batteries are becoming more and more widely used due to their good safety performance (they will not explode like steel-shell and aluminum-shell batteries) and light weight.

[0003] During the preparation process of existing soft-pack button batteries, the annular edge seal usually needs to be corrugated. During the corrugation process, there is a risk of breaking the aluminum-plastic film, and during the bending process after embossing, the embossed position is prone to poor appearance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a method for bending and sealing the edges of soft-pack button batteries in view of the risk of breaking the aluminum-plastic film during the corrugation process of existing soft-pack button batteries.

[0005] To solve the above technical problems, an embodiment of the present invention provides a method for bending and sealing the edge of a soft-pack button battery, comprising: obtaining a soft-pack button battery with a heat-sealed edge, wherein the heat-sealed edge extends in a radial direction of the soft-pack button battery;

[0006] The heat-sealed edge is bent in the same direction along the axial direction of the soft-pack button battery at intervals to form pressing portions, and folded portions are formed between adjacent pressing portions;

[0007] The pleated portion is pressed and attached to the pressing portion adjacent to the pleated portion.

[0008] Optionally, the pressing portion is tightly fitted on the outer side wall of the soft-pack button battery.

[0009] Optionally, the folded portion fits tightly onto the pressing portion.

[0010] Optionally, the folded portion is attached to the pressing portion in a clockwise or counterclockwise direction along the circumferential direction of the soft-pack button battery.

[0011] Optionally, the number of the folds is greater than or equal to 2.

[0012] Optionally, before obtaining the soft-pack button battery with heat-sealed edges, the method for bending and sealing the edges of the soft-pack button battery further comprises obtaining a core having a positive electrode tab and a negative electrode tab;

[0013] Obtaining a first half shell having a first sealed edge and a second half shell having a second sealed edge formed by punching a flexible packaging film;

[0014] placing the pole core into the first half shell;

[0015] butting the first edge seal and the second edge seal so that the first half shell and the second half shell form a shell for accommodating the electrode core, and the outer ends of the positive electrode tab and the negative electrode tab respectively extend out from between the first edge seal and the second edge seal;

[0016] The first sealed edge and the second sealed edge are heat-sealed to form the heat-sealed edge.

[0017] Optionally, after heat-sealing the first and second edge seals to form the heat-sealed edges, the method for bending and sealing edges of soft-pack button batteries further includes trimming the heat-sealed edges to remove excess scraps.

[0018] Optionally, the first half shell is provided with a first pole core pit, and the pole core is accommodated in the first pole core pit.

[0019] Optionally, the second half shell is provided with a second pole core pit, and after the first half shell and the second half shell are docked, the first pole core pit and the second pole core pit form an accommodating cavity for accommodating the pole core.

[0020] Optionally, the flexible packaging film is an aluminum-plastic composite film.

[0021] The method for bending and sealing the edges of soft-pack button batteries provided in an embodiment of the present invention, compared with the prior art, forms pressing portions by bending the heat-sealed edge in the same direction along the axial direction of the soft-pack button battery at intervals on the heat-sealed edge, and forming wrinkled portions between adjacent pressing portions. The wrinkled portions are pressed and adhered to the pressing portions adjacent to the wrinkled portions, replacing the method of pressing the corrugated edges, thereby avoiding the risk of the embossed sealing head damaging the soft packaging film, and also avoiding the problems of poor appearance and poor performance of the soft-pack button battery caused by corrugation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a soft-pack button battery provided by one embodiment of the present invention when the heat-sealed edge is not pressed;

[0023] Figure 2 yes Figure 1 A schematic structural diagram of a soft-pack button battery when the heat-sealed edge is pressed to form a pressing portion and a folded portion;

[0024] Figure 3 yes Figure 2 Schematic diagram of the structure when the wrinkled part of the soft-pack button battery is attached to the pressing part.

[0025] The reference numerals in the specification are as follows:

[0026] 1. Soft-pack button battery;

[0027] 11. heat-sealed edge; 111. pressing portion; 112. pleated portion;

[0028] 12. Positive ear; 13. Negative ear. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figure 1-3 The figure shows the structure of a soft-pack button battery in various states. The method for bending and sealing the edge of a soft-pack button battery provided by an embodiment of the present invention includes the following steps:

[0031] S10: Obtaining a soft-pack button battery 1 having a heat-sealed edge 11, wherein the heat-sealed edge 11 extends in a radial direction along the soft-pack button battery 1;

[0032] S20: bending the heat-sealed edge 11 along the axial direction of the soft-pack button battery 1 at intervals to form pressing portions 111 , and forming wrinkled portions 112 between adjacent pressing portions 111 ;

[0033] S30 : Pressing the pleated portion 112 onto the pressing portion 111 adjacent to the pleated portion 112 .

[0034] A pressing portion 111 is formed by bending the heat-sealed edge 11 in the same direction along the axial direction of the soft-pack button battery 1 at intervals on the heat-sealed edge 11, and a pleated portion 112 is formed between adjacent pressing portions 111. The pleated portion 112 is pressed and adhered to the pressing portion 111 adjacent to the pleated portion 112, replacing the method of pressing the corrugated edge, thereby avoiding the risk of the embossed head damaging the soft packaging film, and also avoiding the problems of poor appearance and poor performance of the soft-pack button battery 1 caused by corrugation.

[0035] In one embodiment, if Figure 3 As shown, the pressing portion 111 fits tightly against the outer wall of the soft-pack button cell 1. This effectively reduces the size of the soft-pack button cell 1. The heat-sealed edge 11 can be pressed into the pressing portion 111 manually, or it can be pressed by a machine. When pressed by a machine, a pressing die that matches the shape of the soft-pack button cell can be used, and a driving member drives the pressing die to press the heat-sealed edge 11.

[0036] In one embodiment, if Figure 3As shown, the folded portion 112 is tightly attached to the pressing portion 111. This can effectively reduce the size of the soft-pack button battery 1. The folded portion 112 can be attached to the pressing portion 111 manually or by a machine, which is not a limitation of the present invention.

[0037] Preferably, if Figure 3 As shown, the wrinkled portion 112 is attached to the pressing portion 111 clockwise or counterclockwise along the circumference of the soft-pack button battery 1, so as to reduce the size of the soft-pack button battery 1 and improve the appearance of the soft-pack button battery 1.

[0038] Of course, the folded portion 112 may not be entirely attached to the pressing portion 111 in a clockwise or counterclockwise direction along the circumferential direction of the soft-pack button battery. It may be that a portion is attached to the pressing portion 111 in a clockwise direction along the circumferential direction of the soft-pack button battery, and the other portion is attached to the pressing portion 111 in a counterclockwise direction along the circumferential direction of the soft-pack button battery. The present invention does not limit this.

[0039] In one embodiment, if Figure 2-3 As shown, the number of the folds 112 is greater than or equal to 2. The distance between and the number of the folds 112 can be adaptively adjusted according to the specific size of the soft-pack button battery 1. For example, the number of the folds 112 can be 6, which is not limited in the present invention.

[0040] In one embodiment, before step S10, that is, before obtaining the soft-pack button battery 1 with the heat-sealed edge 11, the method for bending and sealing the soft-pack button battery further includes:

[0041] Step S40: obtaining a pole core having a positive pole tab 12 and a negative pole tab 13;

[0042] Step S50: Obtain a first half shell having a first sealed edge and a second half shell having a second sealed edge formed by stamping a flexible packaging film; wherein, the positive electrode tab 12 and the negative electrode tab 13 are not particularly limited and can be selected according to actual needs, such as metal strips or metal sheets made of gold, platinum, aluminum, copper, etc.; the electrode core is not particularly limited, such as a wound core or a laminated structure commonly used in the art; the flexible packaging film is preferably an aluminum-plastic composite film, which has good compressive resistance, heat sealing performance, and sealing performance, can effectively prevent battery leakage in the soft-pack button battery, and extend the service life of the soft-pack button battery;

[0043] Step S60: placing the pole core into the first half shell;

[0044] Step S70: butting the first edge seal and the second edge seal so that the first half shell and the second half shell form a shell for accommodating the electrode core, with the outer ends of the positive electrode tab 12 and the outer ends of the negative electrode tab 13 respectively extending out from between the first edge seal and the second edge seal;

[0045] Step S80: heat-seal the first sealed edge and the second sealed edge to form a heat-sealed edge 11.

[0046] In step S50, a first half shell having a first sealed edge and a second half shell having a second sealed edge, formed by stamping a flexible packaging film, are obtained. The first half shell may have a first core pit for accommodating a core, while the second half shell does not, with the entire core contained within the first core pit. Alternatively, the first half shell may have a first core pit, while the second half shell may have a second core pit. After the first and second half shells are joined, the first and second core pits form a cavity for accommodating the core, with the core contained within the cavity.

[0047] In step S80, the first sealed edge and the second sealed edge are heat-sealed to form a heat-sealed edge 11; wherein, the first sealed edge and the second sealed edge can be heat-sealed by a heat sealing machine.

[0048] In one embodiment, after step S80, that is, after heat-sealing the first and second edge seals to form the heat-sealed edge 11, the method for bending and sealing the edge of a soft-pack button battery further includes:

[0049] Step S90: cutting the heat-sealed edge 11 to remove excess scraps. The heat-sealed edge 11 can be cut by a cutting machine.

[0050] In one embodiment, after step S30, that is, after pressing the folded portion 112 onto the pressing portion 111 adjacent to the folded portion 112, the method for bending and sealing the edge of a soft-pack button battery further includes:

[0051] Step S100: A sleeve is placed on the outer periphery of the skirt of the soft-pack button battery (wherein the skirt is formed by the folded portion 112 and the pressing portion 111 ) by a sleeve machine to protect the soft-pack button battery.

[0052] The method for bending and sealing the edge of a soft-pack button battery provided in an embodiment of the present invention, compared with the prior art, forms a pressing portion 111 by bending the heat-sealed edge 11 in the same direction along the axial direction of the soft-pack button battery 1 at intervals on the heat-sealed edge 11, and forming a wrinkle portion 112 between adjacent pressing portions 111. The wrinkle portion 112 is pressed and adhered to the pressing portion 111 adjacent to the wrinkle portion 112, replacing the method of pressing the corrugated edge, thereby avoiding the risk of the embossed seal head damaging the soft packaging film, and also avoiding the problems of poor appearance and poor performance of the soft-pack button battery 1 caused by corrugation.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for bending and sealing the edge of a soft-pack button battery, characterized in that: include: Obtaining a soft-pack button battery having a heat-sealed edge, wherein the heat-sealed edge extends in a radial direction of the soft-pack button battery; The heat-sealed edge is bent in the same direction along the axial direction of the soft-pack button battery at intervals to form pressing portions, and folded portions are formed between adjacent pressing portions; pressing the pleated portion onto the pressing portion adjacent to the pleated portion; The pressing portion is tightly attached to the outer wall of the soft-pack button battery; The folded portion is tightly attached to the pressing portion; The folded portion is attached to the pressing portion clockwise or counterclockwise along the circumferential direction of the soft-pack button battery; The number of the folds is greater than or equal to 2; After the pleated portion is pressed and attached to the pressing portion adjacent to the pleated portion, the adjacent pleated portions are arranged with a distance therebetween, and the pleated portion and the pressing portion form a skirt; The method for bending and sealing the edge of a soft-package button battery further includes: putting a sleeve on the outer periphery of the skirt.

2. The method for bending and sealing the edge of a soft-pack button battery according to claim 1, characterized in that: Before obtaining the soft-pack button battery with heat-sealed edges, the method for bending and sealing the edges of the soft-pack button battery further includes obtaining a pole core with a positive electrode tab and a negative electrode tab; Obtaining a first half shell having a first sealed edge and a second half shell having a second sealed edge formed by punching a flexible packaging film; placing the pole core into the first half shell; butting the first edge seal and the second edge seal so that the first half shell and the second half shell form a shell for accommodating the electrode core, and the outer ends of the positive electrode tab and the negative electrode tab respectively extend out from between the first edge seal and the second edge seal; The first sealed edge and the second sealed edge are heat-sealed to form the heat-sealed edge.

3. The method for bending and sealing the edge of a soft-pack button battery according to claim 2, characterized in that: After heat-sealing the first and second edge seals to form the heat-sealed edges, the method for bending and sealing edges of soft-pack button batteries further includes cutting the heat-sealed edges to remove excess scraps.

4. The method for bending and sealing the edge of a soft-pack button battery according to claim 2, characterized in that: The first half shell is provided with a first pole core pit, and the pole core is accommodated in the first pole core pit.

5. The method for bending and sealing the edge of a soft-pack button battery according to claim 4, characterized in that: The second half shell is provided with a second pole core pit. After the first half shell and the second half shell are butted together, the first pole core pit and the second pole core pit form an accommodating cavity for accommodating the pole core.

6. The method for bending and sealing the edge of a soft-pack button battery according to claim 2, characterized in that: The flexible packaging film is an aluminum-plastic composite film.

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