JPH11307132A - Plate winder for secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily take out a winding, and to prevent the occurrence of a fold line of the winding by constituting a core of a main body and a presser pin for superposably winding a positive electrode plate sheet, a first insulating film, a negative electrode plate sheet and a second insulating film, and arranging the presser pin inserting recessed part in the main body. SOLUTION: An inserting recessed groove 10 of a presser pin 9 is arranged in the shaft direction in a core body 8. When first/second insulating films 15, 16 of the winding starting end are inserted between the core body 8 and the presser pin 9, the presser pin 9 rotatably decends so as to be fitted, sandwiched, held and fixed in the recessed groove 10. A core 5 is rotated in the arrow direction in this state to wind the insulating films 15, 16 several times. Next, a positive electrode plate and negative electrode plate sheets 13, 14 are sent into the core 5 to be superposably wound around the insulating sheets 15, 16. After finishing winding, the presser pin 9 is moved in the horizontal direction to be pulled out of the recessed groove 10, and next, a winding is slidingly taken out in the shaft direction of the core body 8, so that the winding can be easily taken out of the core 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode plate winding device used for manufacturing a secondary battery such as a lithium battery.

[0002]

2. Description of the Related Art Lithium batteries have a large battery capacity and a long battery life. Therefore, lithium batteries are used as batteries for 8 mm video cameras, batteries for mobile phones, batteries as a power source for computer backup, and the like. Has also been done.

[0003] A lithium battery is obtained by inserting a wound body formed by winding a positive electrode plate and a negative electrode plate several times with an insulating film therebetween into a cylindrical battery case, and allowing an electrolyte to penetrate therein. In making the above-mentioned wound body, an electrode plate winding device is used.

[0004] The electrode plate winding device is used to form supply rolls for feeding a sheet-like positive electrode plate and a negative electrode plate, an insulating film interposed between the positive electrode plate and the negative electrode plate, and an outer layer of a wound body. It is provided with each supply roll that sends out the insulating film, and the positive electrode plate sheet, the negative electrode plate sheet, and the insulating film that are sent out from each supply roll are superimposed on each other, wound around a core, and wound up. The core shown in FIG. 12 was used.

The conventional winding core 30 shown in FIG. 1 is provided with a slit-shaped cut portion 31 in the center of the shaft body along the axial direction, and serves as a winding start end at the time of winding. The two insulating films are passed through the cut portion 31 and sandwiched between the cut portions 31, and the positive electrode plate sheet, the first insulating film, the negative electrode plate sheet, and the second insulating film are sandwiched between the two insulating films. They are superposed on each other and wound around a winding core 30.

Here, in order to increase the battery capacity, it is necessary to increase the length of the electrode plate to increase the area of the electrode plate. However, the battery case for accommodating the wound body is a standardized predetermined case. Since the dimensions are determined, if the winding of the electrode plate is too large, it may not be possible to store it in the battery case. For this reason, it has been practiced to harden the winding at the time of winding and densely wind the winding.

[0007]

As described above, when the electrode plate is wound, it is necessary to wind the electrode plate densely in order to increase the battery capacity. When the wound body is removed from the winding core, it is difficult to remove the wound body, and there is a problem that the working efficiency is significantly reduced.

In the wound body removed from the core,
At the end of the insulating film sandwiched between the cut portions 31 of the core, a fold is generated by the pressure at the time of winding,
As shown in FIG. 13, the fold end 32 is
In the center space portion 34 of FIG.

As a post-process after winding the electrode plate, a terminal plate connected to the negative electrode plate is welded to the inner bottom of the battery case using an electrode rod. In this case, the electrode rod is wound. It is inserted through the central space 34 of the body 33. Also,
Similarly, a core tube having a hollow cross section is inserted into the central space portion 34 of the wound body 33 as a later step.

However, as described above, since the fold end 32 of the end of the insulating film protrudes from the central space 34 of the wound body 33, the electrode rod or the core tube is inserted into the central space 34. However, it is difficult to work, so that a film is stretched in a so-called ironing manner by hitting the metal rod against the fold end 32 protruding into the central space 34 using a heated metal rod. The troublesome shape correction work of eliminating the problem has been forced, which has been a major factor in lowering work efficiency.

The present invention solves the above-mentioned drawbacks of the prior art, and is intended for a secondary battery which facilitates taking out of a wound body from a winding core after completion of winding and which does not cause a fold to be formed in the wound body. An object of the present invention is to provide an electrode winding device.

[0012]

The present invention provides (1) a positive electrode sheet supply roll, a negative electrode sheet supply roll, two insulating film supply rolls, and a positive electrode sheet fed from each of the supply rolls. (1) An electrode plate winding device for a secondary battery, comprising: a core for winding an insulating film, a negative electrode plate sheet, and a second insulating film on top of each other; and winding the core from a core body and a holding pin. (2) an electrode plate winding device for a secondary battery, comprising: a concave portion for inserting a holding pin into a core body;
The electrode plate winding device for a secondary battery according to the above (1), wherein the concave portion provided in the core body is formed as a concave groove, (3) a tube having a concave portion in the core body, and the tube And (4) the electrode plate winding device for a secondary battery, comprising: a receiving member fitted to both ends of the secondary battery; and a receiving member having a concave portion. The gist of the present invention is that the concave portion provided in the receiving member is formed as a concave groove.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view of an electrode plate winding mechanism in the apparatus of the present invention, wherein 1 is a positive electrode sheet supply roll for feeding out a positive electrode sheet 13, 2 is a negative electrode sheet supply roll for sending out a negative electrode sheet 14, and 3 is Insulating film 1
5 is a first insulating film supply roll for sending out the insulating film 16 and 4 is a second insulating film supply roll for sending out the insulating film 16.
Is a core supported by a rotating device, 6 is a guide roll, 7
Reference numerals a and 7b denote upper and lower guide rolls.

The core 5 comprises a core body 8 shown in FIG. 2 and a pressing pin 9 shown in FIG. The core body 8 is provided with a recess for inserting the holding pin 9 along the axial direction. In this case, the concave portion is configured as a concave groove 10.

Reference numeral 11 denotes a support fixing portion of the core body 8. The holding pin 9 is formed to have a size that can be inserted into the groove 10 of the core body 8, and its cross-sectional shape is preferably a shape that matches the shape of the groove 10. The shape of the concave groove 10 is preferably U-shaped, and therefore, the cross-sectional shape of the holding pin 9 is preferably circular. Reference numeral 12 denotes a support fixing portion for the holding pin.

The supporting and fixing portion 11 of the core body and the supporting and fixing portion 12 of the presser pin are supported and fixed to a jig of a rotating device by a chuck mechanism. In this state, the core 5 rotates. That is, in a state where the presser pin 9 is fitted into the concave groove 10 of the core body 8, the core body 8 and the presser pin 9 are configured to coaxially rotate the same.

Further, the holding pin 9 is provided so as to be movable in the horizontal direction, and is rotatably provided with one end thereof as a support shaft, so that the holding pin 9 can be fitted into the concave groove 10 from above. Have been.

The movement and rotation of the presser pin 9 can be performed by using a conventionally known linear movement mechanism and rotation movement mechanism using an air cylinder or the like.

The positive electrode sheet 13 is formed by applying lithium powder to an aluminum foil, and the negative electrode sheet 14 is formed by applying carbon powder to a copper foil.

The insulating films 15 and 16 are made of polypropylene or the like. The insulating films 15 and 16 may be made of the same material or different materials.

Hereinafter, the operation of the apparatus of the present invention will be described. The positive electrode sheet 13 from the positive electrode sheet supply roll 1, the negative electrode sheet 14 from the negative electrode sheet supply roll 2, the first insulation film 15 from the first insulation film supply roll 3, the second insulation film from the second insulation film supply roll 4. 2 insulating film 16
Are sent out respectively, and the guide rolls 6, 7a, 7b
Is sent to the core 5 supported by the jig of the rotating device.

The positive electrode sheet 13 and the insulating film 15 are sent to the core 5 in a state of being vertically overlapped by the upper and lower guide rolls 7a, while the negative electrode sheet 14 and the second insulating film 16 are moved by the upper and lower guide rolls 7b. It is sent to the winding core 5 in a state of being vertically overlapped.

Here, at the start of winding, only the insulating films 15 and 16 are wound around the core 5. That is, the core 5
Only the insulating films 15 and 16 are supplied first. Two insulating films 15 as winding start ends,
Reference numeral 16 is inserted between the core body 8 of the core 5 and the presser pin 9 to sandwich the inserted insulating film, so that the presser pin 9 pivots down from above, and the presser pin 9 is It fits into the concave groove 10. Thereby, the insulating films 15, 1
6 is sandwiched between the core body 8 and the holding pin 9 and is held and fixed. As shown in FIG. 4, in a state where the insulating films 15 and 16 are sandwiched between the core body 8 and the holding pin 9, the core 5 rotates in the direction of the arrow in FIG. Wind several turns.
In FIG. 4, for convenience, the insulating films 15 and 16 are indicated by dotted lines. Further, in order to show a state where the positive electrode plate sheet 13 and the negative electrode plate sheet 14 are sent to the core 5, the sheets 13 and 14 are indicated by dashed lines in FIG.

After winding the insulating films 15 and 16 around the core 5 several times, the positive electrode sheet 13 and the negative electrode sheet 14
4 and 5 are fed to the winding core 5 and wound up in a state where they are overlapped with the insulating films 15 and 16. In this winding state, the positive electrode plate sheet 13 is located in the innermost layer, and the insulating film 15, the negative electrode plate sheet 14, and the insulating film 16 are sequentially located outward.

After the completion of the winding, the holding pin 9 is moved in the horizontal direction and is removed from the groove 10 of the core body. Next, the wound body wound around the core 5 is taken out from the core body 8. For this removal, the wound body may be slid along the axial direction of the core body 8. In this case, since the presser pin 9 has already been pulled out, the wound body can be easily separated from the core from the slide, and the wound body can be easily taken out from the core.

FIG. 6 shows the wound body taken out. In the figure,
Reference numeral 17 denotes a wound body, reference numeral 18 denotes a positive plate terminal previously connected to the positive plate sheet 13 in winding, and reference numeral 19 denotes a negative plate terminal similarly connected to the negative plate sheet 14. A core tube having a hollow cross section is inserted into the central space portion 20 of the wound body 17 as a subsequent process.

FIG. 7 shows another embodiment of the present invention. In this embodiment, the core 21 is composed of a core body and a holding pin 27, and the core body is a tubular body 22 having a concave portion.
And a receiving member 23 fitted to both ends of the tubular body 22 and having a concave portion. As shown in FIG. 8, the tube body 22 has a hollow structure in cross section, and the concave portion is formed as a slit-shaped through hole 24.

The concave portion of the receiving member 23 is formed as a concave groove 25, and a support fixing portion 26 which is supported and fixed to a jig of the rotating device by a chuck mechanism is provided at an end of the receiving member. .

In the winding operation, receiving members 23 are fitted to both ends of the tubular body 22, and the grooves 25 and the through holes 24 are aligned so as to be linearly continuous. The insulating films 15 and 16 as the winding start ends are inserted between the holding pin 27 and the tubular body 22, and the holding pin 27 is lowered from above so that the groove 2 is formed.
The pressing pin 27 is fitted into a linear concave portion 28 (FIG. 10) formed by the hole 5 and the through hole 24, and the insulating films 15 and 16 are sandwiched and fixed. In this case, the holding pin 27 is
5 will be supported.

In the state where the insulating films 15 and 16 are sandwiched, the winding core 21 is rotated as in the case of the first embodiment, and as shown in FIG.
After winding only 16 several times, the positive electrode sheet 13 and the negative electrode sheet 14 are wound in a state of overlapping with the insulating films 15 and 16.

After the winding is completed, the receiving member 23 is connected to the tube 22
Pull out more. Then, the holding pin 27 drops through the slit-shaped through-hole 24 of the tube 22 to lose its support, and enters the inner space of the tube 22. By pulling out the presser pin 27 from the hollow portion of the tube, a wound body as a product can be obtained. The wound body has a tube 22 at the center, and the tube 22 functions as a core tube as it is.
Therefore, according to this embodiment, there is no need to insert the core tube into the central space of the wound body as a post-process after winding.

In this embodiment, the wound body can be easily obtained by simply pulling out the receiving member 23 from the tube 22 after the winding is completed, and the wound body can be easily taken out from the winding core. .

[0033]

According to the present invention, since the winding core is composed of the winding core body and the holding pin, the insulating film as the winding start end can be clamped and fixed, and the holding pin is pulled out after the winding is completed. The wound body can be easily taken out from the winding core.

According to the present invention, since the insulating film is sandwiched between the recessed portion of the winding core body and the holding pin, no fold is formed at the portion sandwiched by the pressure at the time of winding. There is no inconvenience that the end of the fold jumps out into the central space. As a result, when inserting an electrode rod for welding a negative electrode plate or inserting a core tube as a post-process after winding, the insertion operation can be performed smoothly, and the end of the fold is protruded. This eliminates the need for a shape correction operation to eliminate the problem, and has the effect of greatly improving work efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an electrode plate winding mechanism in the apparatus of the present invention.

FIG. 2 is a perspective view of a core body.

FIG. 3 is a perspective view of a holding pin.

FIG. 4 is a schematic diagram showing a state where winding is started.

FIG. 5 is a schematic view showing a state in which winding is in progress.

FIG. 6 is a perspective view showing a wound body.

FIG. 7 is an exploded plan view of a winding core showing another embodiment of the present invention.

8 is a longitudinal sectional view taken along line AA of FIG.

FIG. 9 is a longitudinal sectional view taken along the line BB of FIG. 7;

FIG. 10 is a plan view showing a relationship between a core body and a holding pin.

FIG. 11 is a schematic view showing a state in which winding is performed using the winding core shown in FIG. 10;

FIG. 12 is a perspective view showing a conventional core.

FIG. 13 is a plan view showing a state in which a fold end protrudes.

[Explanation of symbols]

 5 core 8 core core 9 holding pin 10 concave groove 13 positive electrode sheet 14 negative electrode sheet 15 insulating film 16 insulating film

Claims (4)

[Claims] 1. A positive electrode sheet supply roll, a negative electrode sheet supply roll, two insulating film supply rolls, and a positive electrode sheet, a first insulating film, a negative electrode sheet, and a second insulating sheet fed from each of the supply rolls. An electrode plate winding device for a secondary battery, comprising a core for superposing films on each other and winding the film, wherein the core is composed of a core body and a holding pin, and the holding pin is inserted into the core body. An electrode plate winding device for a secondary battery, characterized in that a concave portion for performing the operation is provided. 2. The electrode plate winding device for a secondary battery according to claim 1, wherein the concave portion provided in the core body is formed as a concave groove. 3. The secondary battery electrode winding according to claim 1, wherein the core body comprises a tubular body having a concave portion, and receiving members fitted to both ends of the tubular body and having a concave portion. Taking device. 4. The electrode plate winding device for a secondary battery according to claim 3, wherein the concave portion provided in the tube is formed as a slit-shaped through hole, and the concave portion provided in the receiving member is formed as a concave groove. .