KR20010064829A - Manufacture method of lithium secondary battery - Google Patents

Abstract

PURPOSE: Provided is a production process of a lithium secondary battery which supplies an anodic and a cathodic plate cut in a regular size for a separation film so that it simplifies the entire production process. CONSTITUTION: The production process of the lithium secondary battery comprises the steps of: (i) winding the separation film for insulating electrodes by a roller; (ii) applying adhesive to adhere an anode to one side of the separation film by a first tank; (iii) adhering multiple anodic plates to the separation film by a feed adherer for the anode; (iv) applying adhesive to adhere a cathode to the other side of the separation film by a second tank; (v) adhering multiple cathodic plates to the separation film by a feed adherer for the cathode at regular intervals; and (vi) cutting the separation film by a cutter.

Description

Lithium Secondary Battery Manufacturing Method {MANUFACTURE METHOD OF LITHIUM SECONDARY BATTERY}

The present invention relates to a method for manufacturing a lithium secondary battery, and more particularly, to a method for manufacturing a lithium secondary battery that can simplify a manufacturing process of a product and improve performance by supplying electrodes cut to a predetermined size to a separator. will be.

With the recent development of the telecommunications and mobile phone industry, the compact, lightweight of all electronics. There is a need for a lithium secondary battery that is portable and has a high energy density.

Thus, secondary batteries using lithium and lithium ions having high energy density as electrodes have been put into practical use. This lithium secondary battery has a structure in which a plurality of unit cells having a structure of an electrode and a separator are stacked and connected side by side in accordance with their capacity. In this manner, the initial cell having the laminated structure is wound up to have a cylindrical shape. The electrode layer thus constructed is put in a cylindrical can battery to make a cylindrical battery, or the wound battery is flattened and put in a square battery can to produce a square battery.

But. As described above, since the cylindrical and rectangular lithium secondary batteries have a plurality of unit cells connected in parallel to each other in parallel, a voltage rises rapidly during overcharging and ignites, thereby degrading the performance and stability of the battery. There is a problem in that the manufacturing process of the battery is difficult because the electrode tab process for electrically connecting the two to each other.

Accordingly, the present invention is to solve the conventional problems as described above, an object of the present invention, by supplying a positive electrode plate and a negative electrode plate cut to a predetermined standard laminated to the separator, to simplify the manufacturing process of the product and improve the performance To provide a lithium secondary battery.

In order to achieve the above object, a lithium secondary battery manufacturing method according to an embodiment of the present invention includes a first step of unwinding the separator insulating the electrode by a roller;

A second step of applying an adhesive by a first tank so that the positive electrode is adhered to one side of the separator, and a third step of attaching a plurality of positive electrode plates cut to a predetermined size to the separator coated with the adhesive by an anode supply attachment device And a fourth step of applying an adhesive by a second tank so that the negative electrode is adhered to the other side of the separator, and attaching a plurality of negative electrode plates cut to a predetermined size to the separator coated with the adhesive at a predetermined interval by a negative electrode supply attachment machine. And a sixth step of cutting the separator having the positive electrode plate and the negative electrode plate attached thereto as described above by a cutter.

In order to achieve the above object, a method of manufacturing a lithium secondary battery according to another embodiment of the present invention includes a first step of unwinding a negative electrode plate by a first roller, and a first adhesive so that the separator is adhered to one side of the negative electrode plate. A second step of applying an adhesive by a tank, a third step of unwinding and adhering a first separator insulating the electrode to the negative electrode plate coated with the adhesive by a second roller, and attaching the positive electrode to the first separator A fourth step of applying an adhesive by the first tank, and a fifth step of adhering a plurality of first positive electrode plates cut to a predetermined size to the first separator coated with the adhesive at a predetermined interval by a first positive electrode supplying device; And a sixth step of applying an adhesive by a second tank so that the second separator is adhered to the other side of the negative electrode plate, and insulating the electrode on the negative electrode plate to which the adhesive is applied. A seventh step of unwinding and adhering a second separator by a third roller; an eighth step of applying an adhesive by the second tank so that the positive electrode is bonded to the second separator; and a second separator coated with the adhesive. Attaching a plurality of second positive electrode plates cut to a predetermined size at regular intervals by a second positive electrode supply attachment device; and attaching the negative electrode plates having the first and second positive electrode plates and the first and second separators to the cutter as described above. It characterized by including a tenth step of cutting by.

1 is a schematic manufacturing process diagram of a lithium secondary battery according to an embodiment of the present invention;

2 is an explanatory view of a cross-sectional structure of a lithium secondary battery produced by the process of FIG. 1;

3 is a schematic manufacturing process diagram of a lithium secondary battery according to another embodiment of the present invention;

4 is an explanatory diagram of a cross-sectional structure of a lithium secondary battery manufactured by the process of FIG. 3.

<Explanation of symbols for the main parts of the drawings>

1: roller 2,22: first tank

3: anode feed attaching machine 4,25: first vacuum conveyor belt

5,26: tension detection roller 6,27: second tank

7: cathode supply attachment machine 8,30 second vacuum conveyor belt

9,31: 3rd vacuum conveyor belt 10,32: cutting machine

100: separator 110: positive electrode plate

120,200: negative electrode 130,230: adhesive

21: first roller 23: second roller

24: first anode feed attaching machine 28: third roller

29: second positive electrode supply device 210: first and second positive electrode plate

220: first and second separator

Hereinafter, a method of manufacturing a lithium secondary battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, an initial cell of a lithium secondary battery has a stacked structure of three stages of a positive electrode plate, a separator, and a negative electrode plate.

The positive electrode plate 110 is manufactured by applying and drying a positive electrode active material on a metal (aluminum), and is cut to a predetermined size so as to adhere to one side of the separator 100.

The negative electrode plate 120 is manufactured by applying and drying a negative electrode active material on a metal (copper), and is cut to a predetermined size to adhere to the other side of the separator 100.

The separator 100 insulating the electrode is made of a porous polymer membrane of polyethylene (PE) or polypropylene (PP).

The separator 100 has a single layer and a multilayer structure.

A plurality of the positive electrode plate 110 and the negative electrode plate 120 cut to a predetermined size is made to be supplied to the separator 100 at a predetermined interval.

Referring to the manufacturing process to manufacture a lithium secondary battery as described above are as follows.

The separator 100 is formed to be unwound from the roller 1.

At one surface position of the separator 100 unrolled from the roller 1, a first tank 1 is installed to apply an ion conductive adhesive 130 so that the positive electrode 110 is adhered to the surface of the separator 100. have.

The first tank 2 is a die (2a) is installed to apply a point, a line and the front surface of the adhesive 130 on the surface of the separator 110, the amount of adhesive so as to adjust the coating amount of the adhesive 130 of the die (2a) The feeder 2b is provided.

At the surface of the separator 100, a cathode supply attachment device 3 is installed to supply the cathode plate 110 cut to a predetermined size on the surface of the separator 100 at a predetermined interval.

On the opposite side where the positive electrode supply attachment device 3 is installed, a first vacuum conveyor belt 4 is provided to generate tension such that the separator 100 is in close contact with the positive electrode supply attachment device 3.

A tension detection roller 5 is installed between the positive electrode supply attachment device 3 and the second tank 6 to be described later to adjust the tension of the isolation film 100 when the separator 100 moves.

The second tank 6 is provided at the other surface position of the separator 100 so as to apply the ion conductive adhesive 130 to the surface of the separator 100.

The negative electrode supply attachment device 7 is installed at the other surface position of the separator 100 so as to supply a negative plate cut to a predetermined size on the surface of the separator 100 at a predetermined interval.

The second vacuum conveyor belt 8 which generates tension so that the separator 100 is in close contact with the negative electrode supply attacher 7 is installed on the opposite side where the negative electrode supply attacher 7 is installed.

A third vacuum conveyor belt between the negative electrode supply attachment device 7 and the cutter 10 to move the initial cell in the state in which the positive electrode plate, the isolation membrane, and the negative electrode plate are stacked to a cutter 10 cutting the desired size. (9) is provided.

The cutter 10 is installed to cut an initial cell of a battery plate having a three-stage stacked structure of a positive electrode plate, a separator, and a negative electrode plate to a desired size.

The initial cell is laminated to be used at a high temperature to be used as a battery.

Then, the lithium secondary battery manufacturing method according to an embodiment of the present invention having the above configuration will be described in more detail with reference to FIGS. 1 and 2.

First, as shown in FIGS. 1 and 2, the separator 100 for insulating the electrode is uncoiled, and an adhesive 130 is applied so that the electrode is adhered to one side of the separator 100, and the adhesive 130 The positive electrode active material is applied to the surface of the separator 100 coated with) to bond a plurality of positive electrode plates 110 cut to a predetermined size at regular intervals.

Adhesive 130 is applied to the other side of the separator 100 to be bonded to the electrode, the negative electrode active material is applied to the surface of the separator 100 to which the adhesive 130 is applied, a plurality of negative electrode plate 120 cut to a certain size ) Is bonded at regular intervals to form an initial cell of a three-layer laminated structure including a positive electrode plate, a separator, and a negative electrode plate.

Hereinafter, a method of manufacturing a lithium secondary battery according to another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3 and FIG. 4, an initial cell of a lithium secondary battery has a 5-stage stack structure of a first positive electrode plate / first separator / cathode plate / second separator / second positive electrode plate.

The 1.2th positive electrode plate 210 is manufactured by applying and drying a positive electrode active material on a metal (aluminum), and is cut to a predetermined size to adhere to the first and second separators.

The negative electrode plate 200 is manufactured by applying and drying a negative electrode active material on a metal (copper). The 1.2 separator 220 is made of a porous polymer membrane of polyethylene (PE) or polypropylene (PP).

The first and second separators 210 are insulated from the electrodes and have a single layer and a multilayer structure.

The plurality of first and second positive electrode plates 220 cut to a predetermined size are configured to be supplied to the first and second separators 210 at a predetermined interval.

Referring to the manufacturing process to manufacture a lithium secondary battery as described above are as follows.

The negative electrode plate 200 is formed to be unwound from the first roller 21.

The first tank 22 to apply the ion conductive adhesive 230 to the surface of the negative electrode plate to the first separator 220 and the second positive electrode plate 210 at one surface position of the negative electrode plate drawn from the first roller 21. Is installed.

The first and second dies 22a and 22c are installed on the surface of the negative electrode plate 200 so that the first and second dies 22a and 22c are coated on the surface of the negative electrode plate 200. Quantitative feeders 22b and 22d are provided to adjust the coating amount of adhesive 230 at 22c.

A second roller 23 is formed at one surface of the negative electrode plate 200 to unwind the first separator 220 so that the first separator 22 is adhered to the surface of the negative electrode plate 200 coated with the adhesive 230 by the first die 22a. have.

The second die 22c for applying the adhesive 230 to the surface of the first separator 220 to be bonded to the surface of the first separator 220 adhered to the negative electrode plate 200. Is installed, the first positive electrode supply attachment device 24 is installed on the surface of the first separator 220 so that the first positive electrode plate 210 is supplied at a predetermined interval.

The first vacuum conveyor belt 25 is provided at a position opposite to the first anode supply attachment device 24 to generate tension such that the first separator 220 is in close contact with the first anode supply attachment device 24. .

A tension detection roller 26 is provided between the first positive electrode supply attachment device 24 and the second tank 27 to be described later to adjust the tension of the stacked initial cells of the first positive electrode plate / first separator / cathode plate.

The second tank 27 to apply the ion conductive adhesive 230 to the second surface of the negative electrode plate 200 to adhere the second separator 220 and the second positive electrode plate 210 to the surface of the negative electrode plate 200 is moved. Is installed.

The second tank 27 includes first and second dies 27a and 27c to apply dots, lines, and front surfaces of the adhesive 230 to the other surface of the negative electrode plate 200 and the surface of the second separator 220. At the same time, the fixed-quantity feeders 27b and 27d are installed to control the amount of adhesive 230 applied to the first and second dies 27a and 27c.

At the other surface position of the negative electrode plate 200, a third roller 28 for unwinding the second separator 200 to be adhered to the negative electrode plate surface 200 to which the adhesive 230 is applied by the first die 27a is installed. It is.

At the surface of the second separator 220 adhered to the negative electrode plate 200, the second die for applying the adhesive 230 to the second positive electrode plate 210 is attached to the surface of the second separator 220. A second anode supply attaching device 29 is installed on the surface of the second separator 220 so as to supply the second cathode plate 210 at a predetermined interval.

A second vacuum conveyor belt 27 is provided at a position opposite to the second anode supply attachment device 29 to generate tension such that the second separator 100 is in close contact with the second anode supply attachment device 29. .

The second positive electrode feed adhering device 29 moves the initial cell in a state where the first positive electrode plate / first separator / cathode plate / second separator / second positive electrode plate is stacked to a cutter 32 for cutting to a desired size. ) And a third vacuum conveyor belt 31 is installed between the cutter 32.

The cutter 32 is installed to cut an initial cell of a panel having a 5-stage stacking structure to a desired size.

It is intended to be used as a battery by laminating the initial cell at a high temperature to suit the purpose.

Then, a method of manufacturing a lithium secondary battery according to another embodiment of the present invention having the above configuration will be described in more detail with reference to FIGS. 3 and 4.

First, as shown in FIGS. 3 and 4, the negative electrode plate 200 to be unwound,

An adhesive 230 is applied to one surface of the negative electrode plate 200 so as to adhere the first separator, and the first separator 220 that insulates the electrode is uncoated and adhered to the surface of the negative electrode plate to which the adhesive 230 is applied.

In this state, the adhesive 230 is applied so that the electrode is adhered to the surface of the first separator 220, and the plurality of first anode plates cut to a predetermined size on the surface of the first separator coated with the adhesive 230 ( 210) is bonded at regular intervals.

In this state, an adhesive 203 is applied to the other side of the negative electrode plate 200 so that the second separator is adhered, and a second separator for insulating the electrode is uncoated and bonded to the surface of the negative electrode plate to which the adhesive 230 is applied.

In this state, an adhesive 230 is applied so that an electrode adheres to the surface of the second separator 220, and a plurality of agents cut to a predetermined size on the surface of the second separator 220 to which the adhesive 230 is applied. By attaching the two positive plates at regular intervals, an initial cell of a five-layer laminated structure including the first positive plate / first separator / cathode plate / second separator / second positive electrode plate is formed.

On the other hand, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention.

As described above, according to the lithium secondary battery manufacturing method according to the present invention,

By supplying a positive electrode plate and a negative electrode plate cut to a predetermined size to the separator laminated, there is an excellent effect that can simplify the manufacturing process of the product and improve the performance.

Claims (2)

A first step of unwinding the separator insulating the electrode by a roller; A second step of applying an adhesive by a first tank so that the positive electrode is adhered to one side of the separator; A third step of bonding a plurality of positive electrode plates cut to a predetermined size to the separator coated with the adhesive by a positive electrode supply attaching machine; A fourth step of applying an adhesive by a second tank so that the negative electrode is adhered to the other side of the separator; A fifth step of adhering the plurality of negative electrode plates cut to a predetermined size to the separator coated with the adhesive at a predetermined interval by a negative electrode supply attachment device; And a sixth step of cutting the separator attached with the positive electrode plate and the negative electrode plate by a cutter as described above. A first step of unwinding the negative electrode plate by the first roller, A second step of applying an adhesive by a first tank so that the separator is adhered to one side of the negative electrode plate, A third step of unwinding and adhering the first separator for insulating the electrode to the negative electrode plate to which the adhesive is applied by a second roller; A fourth step of applying an adhesive by the first tank so that the positive electrode is adhered to the first separator; A fifth step of adhering the plurality of first positive electrode plates cut to a predetermined size to the first separator coated with the adhesive at a predetermined interval by a first positive electrode supply attaching machine; A sixth step of applying an adhesive by a second tank so that a second separator is adhered to the other side of the negative electrode plate; A seventh step of unwinding and adhering a second separator insulating the electrode to the negative electrode plate coated with the adhesive by a third roller; An eighth step of applying an adhesive by the second tank so that the positive electrode is adhered to the second separator; A ninth step of adhering a plurality of second positive electrode plates cut to a predetermined size to the second separator coated with the adhesive at a predetermined interval by a second positive electrode supply attachment device; And a tenth step of cutting the first and second positive electrode plates and the negative electrode plates to which the first and second separators are attached by a cutter.