A processing method for a flat wire strip and a button battery

Abstract

The present invention discloses a processing method for a flat wire strip and a button cell. The flat wire includes a wire, an insulating layer, a first pad, and a second pad. The wire is a flat wire. One end of the wire is provided with the first pad, and the other end is provided with the second pad. The first pad and the second pad are integrally provided with the wire, and the outer side of the wire between the first pad and the second pad is coated with the insulating layer. The present invention adopts a flat wire structure, which can minimize the occupied space of the battery. Using the battery of the present invention can greatly reduce the ineffective space occupied by the battery. For example, the overall thickness of a 4-mm battery is still about 4 mm.

Description

Technical Field

[0001] The present invention discloses a button cell accessory, in particular a processing method for a flat wire strip and a button cell, belonging to the technical field of micro-batteries. Background Art

[0002] A button cell, also known as a coin cell, refers to a battery with an outer shape like a small button. Generally, it has a relatively large diameter and a relatively thin thickness (compared to cylindrical batteries such as the No. 5 AA batteries in the market). Button cells are classified according to their outer shape, and the corresponding battery classifications include cylindrical batteries, square batteries, and special-shaped batteries, etc.

[0003] Generally, button cells are commonly divided into two types: rechargeable and non-rechargeable. Rechargeable ones include 3.6V rechargeable lithium-ion coin cells (LIR series) and 3V rechargeable lithium-ion coin cells (ML or VL series); non-rechargeable ones include 3V lithium manganese coin cells (CR series) and 1.5V alkaline zinc manganese coin cells (LR and SR series).

[0004] Currently, small button cells are usually applied to small electronic devices such as in-ear Bluetooth headsets and hearing aids. Since the electronic devices are small in size, the requirements for the internal space are extremely strict, and even 1 millimeter or even half a millimeter of space is extremely important.

[0005] In the existing technology, when a button cell is used, usually a wire is welded to each of the positive and negative electrodes of the battery to achieve the function of conduction. Currently, the wires are all copper wires with insulating outer skins. Although the diameter of the copper wire is small, it still occupies a certain space. For example, for a button cell with a thickness of 4mm, after welding wires at both ends, the space thickness it occupies is at least 4.8mm, which means that 0.8mm of precious space is occupied by the wires. How to effectively utilize the internal space of electronic products has become an urgent technical problem in the industry. Summary of the Invention

[0006] Aiming at the above-mentioned disadvantage that the wires of button cells in the existing technology occupy a large space, the present invention provides a processing method for a flat wire strip and a button cell, which adopt a flat wire structure and can minimize the space occupied by the battery.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a flexible flat wire for a button cell, the flat wire includes a wire, an insulating layer, a first solder pad, and a second solder pad. The wire adopts a flat wire. One end of the wire is provided with the first solder pad, and the other end is provided with the second solder pad. The first solder pad and the second solder pad are integrally provided with the wire, and the outer side of the wire between the first solder pad and the second solder pad is coated with an insulating layer.

[0008] A flat wire tape, the tape includes a flat wire as described above, a tape fixed edge, and a connector. There are two tape fixed edges, and there is more than one flat wire. More than one flat wire is arranged in parallel between the two tape fixed edges. A connector is respectively connected to two pads on each flat wire, and is connected to the tape fixed edge through the connector.

[0009] A processing method for a flat wire tape, the method includes the following steps:

[0010] Step S1, material preparation: Prepare the required wire material tape and insulation layer tape. The wire material tape selects a nickel tape or a rolled copper foil tape with a suitable width according to the specific product width. The insulation layer tape selects a maleic anhydride grafted modified PP material, and selects an insulation layer tape with a suitable width according to the width of the insulation layer;

[0011] Step S2, thermal compounding: Arrange an insulation layer on each of the upper and lower sides of the wire material tape, and then through a thermal compounding mechanism, thermally compound the three layers of materials together to form a wire material tape with an insulation layer. During thermal compounding, the thermal compounding temperature is 140°C to 160°C;

[0012] Step S3, cutting: Cut the tape according to the set shape, cut off the hollowed-out part, including the tape fixed edge, the connector, and the flat wire part is reserved;

[0013] Step S4, pasting protective film: Paste a layer of protective film on each of the upper and lower sides of the tape;

[0014] Step S5, hot pressing: Hot press the tape pasted with the protective film through a hot pressing mechanism. During hot pressing, the insulation layer melts and deforms, and a small amount of insulation layer material overflows from the side of the wire body part. The upper and lower layers of insulation layer materials are fused together to form an insulation layer on the side of the wire body part. The thermal compounding temperature is 150°C to 160°C;

[0015] Step S6, naturally cool to room temperature to obtain the finished product.

[0016] A processing method for a flat wire tape, the method includes the following steps:

[0017] Step S1, material preparation: Prepare the required wire material tape and insulation layer material. The wire material tape selects a nickel tape or a rolled copper foil tape with a suitable width according to the specific product width. The insulation layer material selects epoxy glue or acrylic acid;

[0018] Step S2, coating: Coat an insulation layer material on each of the upper and lower sides of the wire material tape, and the coating thickness of the insulation layer material is 0.035±0.002mm;

[0019] Step S3, Semi-curing: Heat the wire material tape coated with the insulating layer material for semi-curing at a heating temperature of 90°C ± 5°C, so that the insulating layer material adheres to the wire material tape in a semi-cured state;

[0020] Step S4, Cutting: Cut the tape according to the set shape, cut off the hollowed-out part, including the fixed edge of the tape, the connection head, and the flat wire part is retained;

[0021] Step S5, Applying protective film: Apply a layer of protective film on both the upper and lower sides of the tape, and the protective film uses PA material;

[0022] Step S6, Pressing: Press the tape pasted with the protective film through a pressing mechanism. During the pressing process, the semi-cured insulating layer deforms under the extrusion of the pressing structure, and a small amount of insulating layer material overflows from the side of the wire body part. The upper and lower layers of insulating layer materials fuse together to form an insulating layer on the side of the wire body part;

[0023] Step S7, Full-curing: Heat the pressed wire material tape for full-curing at a heating temperature of 160°C ± 5°C, so that the insulating layer material adheres to the wire material tape in a fully cured state;

[0024] Step S8, Naturally cool to room temperature to form a finished product.

[0025] A button cell, the battery includes a battery body and two flat wires as described above. Among them, the first pads of the two flat wires are respectively electrically connected to the positive and negative electrodes of the battery. The first pads are connected together by resistance welding or laser welding, or adhered together by conductive adhesive. The flat wire can be connected to the front or side of the battery body, and an insulating film is installed outside the battery or coated with insulating paint.

[0026] The technical solution adopted by the present invention to solve its technical problems further includes:

[0027] The thickness of the wire is 0.03 ± 0.002 mm, and the width of the wire is 0.5 - 1 mm. The thickness of the insulating layer is 0.035 ± 0.002 mm.

[0028] The wire adopts nickel sheet or rolled copper foil material.

[0029] The insulating layer adopts maleic anhydride grafted modified PP material or epoxy glue or acrylic acid or PA film material.

[0030] A layer of protective film is respectively covered on the upper and lower parts of the tape, and the protective film is selected from PP material or PA film.

[0031] The beneficial effects of the present invention are as follows: The present invention adopts a flat wire structure, which can minimize the occupied space of the battery. By using the battery of the present invention, the ineffective space occupied by the battery can be greatly reduced. For example, the overall thickness of a 4-mm battery is still about 4 mm.

[0032] The following will further illustrate the present invention in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG. 1 is a schematic diagram of the flat wire structure of the present invention.

[0034] FIG. 2 is a schematic cross-sectional structure diagram of A-A of FIG. 1.

[0035] FIG. 3 is a schematic diagram of the flat wire strip structure of the present invention.

[0036] In the figures, 1 - wire, 2 - insulating layer, 3 - first pad, 4 - second pad, 5 - hollow, 6 - strip fixing edge, 7 - first connector, 8 - second connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] This embodiment is the preferred embodiment of the present invention. All other embodiments with the same or similar principles and basic structures are within the protection scope of the present invention.

[0038] Please refer to FIG. 1 and FIG. 2. The present invention protects a flexible flat wire for a button battery, which mainly includes a wire 1, an insulating layer 2, a first pad 3 and a second pad 4. The wire 1 is a flat wire. The thickness of the wire 1 is 0.03 ± 0.002 mm, and the width of the wire 1 is 0.5 - 1 mm. A first pad 3 is provided at one end of the wire 1, and a second pad 4 is provided at the other end. The first pad 3 is used to connect with the battery, and the second pad 4 is used to connect with the electronic device. In this embodiment, the shapes of the first pad 3 and the second pad 4 can be specifically set according to actual needs, such as: circular, semi-circular, elliptical, rectangular, etc. The first pad 3 and the second pad 4 are integrally provided with the wire 1. In this embodiment, they are formed by cutting a sheet material. The outer side of the wire 1 between the first pad 3 and the second pad 4 is coated with an insulating layer 2, and the thickness of the insulating layer 2 is 0.035 ± 0.002 mm. In this embodiment, the wire 1 is made of nickel sheet or rolled copper foil, and the insulating layer 2 is made of maleic anhydride grafted modified PP material or epoxy glue or acrylic acid or PA material.

[0039] The present invention simultaneously protects a flat wire tape. The tape includes a tape fixed edge 6, flat wires, and connectors. There are two tape fixed edges 6. There is more than one flat wire, and the more than one flat wires are arranged in parallel between the two tape fixed edges 6. One connector is respectively connected to two pads on each flat wire, and is connected to the tape fixed edge 6 through the connector. Among them, a first connector 7 is connected to the first pad 3, and a second connector 8 is connected to the second pad 4. The flat wire is connected to the tape fixed edge 6 through the first connector 7 and the second connector 8, and it can be conveniently removed during use. In this embodiment, a protective film is respectively covered on the upper and lower sides of the tape. The protective film can be made of PP (polypropylene) material or PA (nylon, polyamide) material. Specifically in implementation, other materials can also be selected.

[0040] The present invention simultaneously protects a processing method of a flat wire tape, and the method includes the following steps:

[0041] Step S1, material preparation: Prepare the required wire material tape and insulating layer tape. The wire material tape selects a nickel tape or a rolled copper foil tape with a suitable width according to the width of the specific product. The insulating layer tape selects a maleic anhydride grafted modified PP material or a PA film structural adhesive, and selects an insulating layer tape with a suitable width according to the width of the insulating layer. In this embodiment, the wire material tape is preferably a tape with a thickness of 0.03 ± 0.002 mm, and the insulating layer tape is preferably a tape with a thickness of 0.035 ± 0.002 mm;

[0042] Step S2, thermal lamination: Arrange an insulating layer on the upper and lower sides of the wire material tape respectively, and then through a thermal lamination mechanism, thermally laminate the three layers of materials together to form a wire material tape with an insulating layer. In this embodiment, during thermal lamination, the thermal lamination temperature is 140°C to 160°C.

[0043] In this embodiment, the thermal lamination mechanism includes a driving lamination roller, a driven lamination roller, and a heating mechanism. The driving lamination roller and the driven lamination roller are arranged oppositely. The driving lamination roller is made of a rigid material, and the driven lamination roller is made of a flexible material. The driving lamination roller and the driven lamination roller are closely arranged, and the driven lamination roller can be driven to rotate by the driving lamination roller to perform thermal lamination on the wire material tape. In this embodiment, a heating device is arranged inside the driving lamination roller to heat the driving lamination roller. The heating device can adopt an electric heating wire. In this embodiment, a lamination roller driving device is also arranged to drive the driving lamination roller to rotate. The lamination roller driving device can adopt a driving motor, directly drive the driving lamination roller to rotate through the driving motor, or drive the driving lamination roller to rotate by driving a belt, a chain, or a gear, etc. through the driving motor, and drive the driving lamination roller to rotate through the belt, the chain, or the gear, etc.

[0044] The active composite roller is made of stainless steel, and the passive composite roller is made of silica gel. Through the cooperation of the rigid composite roller and the flexible composite roller, the hot pressing and compounding of the wire material tape is realized.

[0045] Step S3, cutting: Cut the tape according to the set shape, cut off the hollowed-out part 5, including the tape fixed edge 6, the connection head and the flat wire part are reserved. In this embodiment, the cutting process can be carried out by punching, die-cutting or laser cutting. In this embodiment, laser cutting is preferably used. After cutting, remove the hollowed-out part 5;

[0046] Step S4, attaching a protective film: Attach a layer of protective film to the upper and lower sides of the tape respectively. The protective film can be made of PET (polyethylene terephthalate) material to protect it;

[0047] Step S5, hot pressing: Pass the tape with the protective film attached through the hot pressing mechanism for hot pressing. During the hot pressing process, the insulating layer melts and deforms, and a small amount of insulating layer material overflows from the side of the main body part of the wire 1. The upper and lower layers of insulating layer materials are fused together to form an insulating layer 2 on the side of the main body part of the wire 1, so as to achieve the effect that the periphery of the main body part of the wire 1 has an insulating layer 2. In this embodiment, during the hot compounding, the hot compounding temperature is 140°C to 160°C.

[0048] In this embodiment, the hot pressing mechanism includes an active pressing roller, a driven pressing roller and a heating mechanism. The active pressing roller and the passive pressing roller are arranged opposite to each other. The active pressing roller and the passive pressing roller are made of rigid materials and are closely arranged. The passive pressing roller can be driven to rotate by the active pressing roller to perform hot pressing on the wire material tape. In this embodiment, a heating device is arranged inside the active pressing roller to heat the active pressing roller. The heating device can adopt an electric heating wire. In this embodiment, a pressing roller driving device is also arranged to drive the active pressing roller to rotate. The pressing roller driving device can adopt a driving motor. The active pressing roller can be directly driven to rotate by the driving motor, or the driving motor can drive a belt, a chain or a gear, etc., and the active pressing roller can be driven to rotate through the belt, the chain or the gear, etc.

[0049] Step S6, naturally cool to room temperature to form a finished product.

[0050] The present invention also protects another processing method for a flat wire tape, and this method includes the following steps:

[0051] Step S1. Material preparation: Prepare the required wire material tape and insulation layer material. The wire material tape is selected as a nickel tape or a rolled copper foil tape with a suitable width according to the specific product width, and the insulation layer material is selected as epoxy glue, acrylic acid or PA. In this embodiment, the wire material tape is preferably a tape with a thickness of 0.03±0.002 mm;

[0052] Step S2. Coating: Coat a layer of insulation layer material on both the upper and lower sides of the wire material tape. The coating thickness of the insulation layer material is 0.035±0.002 mm. In this embodiment, the coating can be carried out by processes such as spraying or roll coating;

[0053] Step S3. Semi-curing: Heat and semi-cure the wire material tape coated with the insulation layer material at a heating temperature of 90°C±5°C, so that the insulation layer material adheres to the wire material tape in a semi-cured state and has a certain fluidity;

[0054] Step S4. Cutting: Cut the tape according to the set shape, cut off the hollowed-out part 5, including the fixed edge 6 of the tape, the connection head and the flat wire part are reserved. In this embodiment, the cutting process can be carried out by punching, die cutting or laser cutting. In this embodiment, laser cutting is preferably used. After cutting, remove the hollowed-out part 5;

[0055] Step S5. Applying protective film: Apply a layer of protective film on both the upper and lower sides of the tape. The protective film can be made of PET (polyethylene terephthalate) or PA material to protect it;

[0056] Step S6. Pressing: Press the tape pasted with the protective film through a pressing mechanism. During the pressing process, the semi-cured insulation layer deforms under the extrusion of the pressing structure, and a small amount of insulation layer material overflows from the side of the main body part of the wire 1. The upper and lower layers of insulation layer materials are fused together to form an insulation layer 2 on the side of the main body part of the wire 1, so as to achieve the effect that the periphery of the main body part of the wire 1 is provided with the insulation layer 2.

[0057] In this embodiment, the pressing mechanism includes an active pressing roller and a driven pressing roller. The active pressing roller and the passive pressing roller are arranged oppositely. The active pressing roller and the passive pressing roller are made of rigid materials and are closely arranged. The passive pressing roller can be driven to rotate by the active pressing roller to press the wire material tape. In this embodiment, a pressing roller driving device is also provided for driving the active pressing roller to rotate. The pressing roller driving device can adopt a driving motor to directly drive the active pressing roller to rotate through the driving motor, or the driving motor can drive a belt, a chain or a gear, etc., and drive the active pressing roller to rotate through the belt, the chain or the gear, etc.

[0058] Step S7, full curing: Heat the pressed wire material tape for full curing at a heating temperature of 160°C ± 5°C so that the insulating layer material adheres to the wire material tape in a fully cured state;

[0059] Step S8, naturally cool to room temperature to obtain the finished product.

[0060] The present invention also protects a button cell, which includes a battery body and two flat wires. Among them, the first pads of the two flat wires are respectively electrically connected to the positive and negative electrodes of the battery, and the first pads can be connected together by resistance welding or laser welding, or adhered together by conductive glue. In this embodiment, the flat wires can be connected to the front or side of the battery body.

[0061] In this embodiment, an insulating film is installed on the outer side of the battery or coated with insulating paint to achieve insulation on the outer side of the battery.

[0062] The present invention adopts a flat wire structure, which can minimize the occupied space of the battery. Using the battery of the present invention can greatly reduce the ineffective space occupied by the battery. For example, the overall thickness of a 4mm battery is still about 4mm.

Claims

1. A processing method for a flat wire strip, characterized in that: The method described above includes the following steps: Step S1, material preparation: Prepare the required wire material tape and insulation layer tape. The wire material tape selects a nickel tape or a rolled copper foil tape with a suitable width according to the width of the specific product, and the insulation layer tape selects a maleic anhydride grafted and modified PP material, and selects an insulation layer tape with a suitable width according to the width of the insulation layer; Step S2, thermal lamination: Arrange an insulation layer on each of the upper and lower sides of the wire material tape, and then through a thermal lamination mechanism, thermally laminate the three layers of materials together to form a wire material tape with an insulation layer. During thermal lamination, the thermal lamination temperature is 140°C to 160°C; Step S3, cutting: Cut the tape according to the set shape, cut off the hollowed-out part, including the tape fixed edge, the connection head, and the flat wire part are retained; Step S4, applying a protective film: Apply a layer of protective film on each of the upper and lower sides of the tape; Step S5, hot pressing: Hot press the tape with the protective film pasted through a hot pressing mechanism. During hot pressing, the insulation layer melts and deforms, and a small amount of insulation layer material overflows from the side of the wire body part. The upper and lower layers of insulation layer materials fuse together to form an insulation layer on the side of the wire body part. The thermal lamination temperature is 140°C to 160°C; Step S6, naturally cool to room temperature to obtain the finished product; The flat wire tape described above includes a flat wire, a tape fixed edge, and a connection head. The connection head is connected to the flat wire, and the flat wire is connected to the tape fixed edge through the connection head; The flat wire includes a wire, an insulation layer, a first pad, and a second pad. The wire uses a flat wire. One end of the wire is provided with a first pad, and the other end is provided with a second pad. The first pad and the second pad are integrally provided with the wire. The outside of the wire between the first pad and the second pad is coated with an insulation layer.

2. The processing method of a flat wire strip according to claim 1, characterized in that: The thickness of the wire is 0.03 ± 0.002 mm, and the width of the wire is 0.5 to 1 mm.

3. A processing method for a flat wire strip according to claim 1, characterized in that: The thickness of the insulation layer is 0.035 ± 0.002 mm.

4. The processing method of a flat wire strip according to claim 1, characterized in that: The wire uses a nickel sheet or a rolled copper foil material.

5. A processing method of a flat wire strip according to claim 1, characterized in that: The insulation layer uses a maleic anhydride grafted and modified PP material, or an epoxy adhesive, or acrylic acid, or a PA film material.

6. A processing method of a flat wire strip according to claim 1, characterized in that: There are two tape fixed edges provided. There is more than one flat wire. More than one flat wire is arranged in parallel between the two tape fixed edges. A connection head is respectively connected to each of the two pads on each flat wire, and is connected to the tape fixed edge through the connection head.

7. A processing method for a flat wire strip according to claim 6, characterized in that: A layer of protective film is respectively covered on the upper and lower sides of the tape. The protective film selects a PP or PA material.

8. A processing method for a flat wire strip, characterized in that: The method described above includes the following steps: Step S1, material preparation: Prepare the required wire material tape and insulation layer material. The wire material tape selects a nickel tape or a rolled copper foil tape with a suitable width according to the width of the specific product, and the insulation layer material selects an epoxy adhesive or acrylic acid; Step S2, coating: Coat an insulation layer material on each of the upper and lower sides of the wire material tape. The coating thickness of the insulation layer material is 0.035 ± 0.002 mm; Step S3, Semi-curing: Heat the wire material tape coated with the insulating layer material for semi-curing at a heating temperature of 90°C ± 5°C, so that the insulating layer material adheres to the wire material tape in a semi-cured state; Step S4, Cutting: Cut the tape according to the set shape, cut off the hollowed-out part, including the fixed edge of the tape, the connection head, and the flat wire part is retained; Step S5, Applying protective film: Apply a layer of protective film on both the upper and lower sides of the tape, and the protective film uses PA material; Step S6, Pressing: Press the tape with the protective film pasted through the pressing mechanism. During the pressing process, the semi-cured insulating layer deforms due to the extrusion of the pressing structure, and a small amount of the insulating layer material overflows from the side of the wire body part. The upper and lower layers of the insulating layer material are fused together to form an insulating layer on the side of the wire body part; Step S7, Full-curing: Heat the pressed wire material tape for full-curing at a heating temperature of 160°C ± 5°C, so that the insulating layer material adheres to the wire material tape in a fully-cured state; Step S8, Naturally cool to room temperature to obtain the finished product.

9. A button cell, characterized in that: The battery described above includes a battery body and two flat wires processed by the method of a flat wire tape as described in any one of claims 1 to 5. Among them, the first pads of the two flat wires are respectively electrically connected to the positive and negative electrodes of the battery. The first pads are connected together by resistance welding or laser welding, or adhered together by conductive adhesive. The flat wires can be connected to the front or side of the battery body, and an insulating film is installed or an insulating paint is coated on the outside of the battery.

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