JP2003243270A - Bending mechanism for electronic component element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems, in a mechanism for folding in zigzags a lamination sheet of an electrode sheet and a separator, that if folding is done each time, variations could occur in a folding dimension between different folding actions, resulting in poor manufacturing efficiency, and if folding is done using a die, the die rubs against the element, thus tending to damage an element surface. <P>SOLUTION: A mechanism is provided, in which clamping devices hold both ends of the lamination sheet and a plurality of pads are provided on insides of creases in the lamination sheet. While a tensile force is being given to the lamination sheet using the clamping devices, the plurality of pads press the lamination sheet and make the creases gather together, thereby folding the lamination sheet as necessary. According to this folding mechanism, the lamination sheet is folded in zigzags at once, which enhances manufacturing efficiency. The mechanism also reduces rubbing between the insides of creases and pads, which minimizes damage to the electronic component elements. Furthermore, the folding mechanism offers a high dimensional accuracy. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending mechanism for electronic component elements. In particular, it relates to a capacitor or battery element sheet folding mechanism.

[0002]

2. Description of the Related Art Electrolytic capacitor elements are etched,
It is laminated via a separator on an anode foil or a cathode foil that has undergone chemical conversion treatment or the like. A battery element such as a lithium ion battery is laminated on a positive electrode plate in which a positive electrode current collector is coated with a positive electrode active material and a negative electrode plate in which a negative electrode current collector is coated with a negative electrode active material, with a separator interposed therebetween. When accommodating an element such as an electrolytic capacitor or a lithium-ion battery in a thin case, a laminated structure in which electrode sheets and separators are alternately laminated is adopted. Then, from the viewpoint of manufacturing efficiency, as one method, a method of bending the elements into a 99-fold shape and stacking them is adopted.

As a method of folding the element into a 99-fold shape, for example, as shown in FIG. 3, the laminated sheet 1 drawn out from the unwinding reel 4 is paired with a pair of upper and lower creasing dies 5.
A crease is made with something like (Japanese Patent Laid-Open No. 2000-
No. 164243, see FIG. 8). Considering the manufacturing efficiency, as shown in FIG.
It is possible to make a crease with something like. Then, when the predetermined number is reached, they are separated and brought together in the element thickness direction.

[0004]

In the above-mentioned conventional example, not only the manufacturing efficiency is poor, but also when the crease is made, not only is it pushed but also the crease die and the element rub against each other. In the element, the etching surface is crushed, the chemical conversion film is damaged, and in the battery element such as a lithium-ion battery, the active material is easily peeled off from the current collector, so that the element surface is easily damaged. Further, if the substance scraped and scattered remains in the element, or a part of the separator extends or is damaged, there is a risk of damaging the element characteristics. In particular, in the continuous creasing type method of FIG. 4 in which the manufacturing efficiency is improved, this becomes remarkable. Also,
When the bending is performed once as in the conventional example, it is difficult to stabilize the individual bending dimensions.

The object of the present invention is to improve the manufacturing efficiency, reduce the damage to the electronic component elements that occur during the folding process of the multiplication table, and bend the electronic component element with high dimensional accuracy. To provide.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a mechanism for folding a laminated sheet of an electrode sheet and a separator into a pair of sheets for holding both ends of the laminated sheet. A holder and a plurality of contact plates located between the holders and located inside the folds of the laminate sheet, and applying the tension to the laminate sheet by the holder to form the laminate sheet. A mechanism for bending the laminate sheet by bringing one of the holding tools, the plurality of holding boards and the other holding tool together in this order while relatively pressing with the touching board. In such a mechanism, the laminated sheet is folded at one time and the contact plate is provided at the position inside the fold, so that the inside of the fold and the contact plate can be prevented from rubbing against each other.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows a state of the setting before bending. In the case of an element of an electrolytic capacitor, 1 is a laminated sheet, which is laminated on an anode foil or a cathode foil that has been subjected to treatments such as etching and chemical conversion, with a separator interposed therebetween. If the anode foil is fragile and cannot be bent, separators are laminated on the cathode foil to form a laminate sheet, which is folded 99 times, and then cut into strips of the anode foil. Taking an aluminum electrolytic capacitor as an example, an aluminum foil is etched to form innumerable minute pits that extend inward from the front and back surfaces, and an oxide film is provided on the entire surface by chemical conversion treatment. Further, it is laminated on a cathode foil having a thickness of about 100 μm which is not etched or is etched like an anode foil, with a separator made of Manila paper or kraft paper having a thickness of about 50 μm interposed therebetween. In the case of a battery element such as a lithium-ion battery, it is laminated via a separator on a positive electrode plate having a positive electrode current collector coated with a positive electrode active material and a negative electrode plate having a negative electrode current collector coated with a negative electrode active material. Taking a lithium ion battery as an example, a positive electrode plate having a thickness of about 100 μm in which a positive electrode active material of a lithium composite oxide is applied to an aluminum foil positive electrode current collector and a copper foil negative electrode current collector made of a carbonaceous material are used as a negative electrode active material. It is laminated on a negative electrode plate having a thickness of about 150 μm, which is coated with a substance, with a separator made of a polyethylene microporous film having a thickness of about 50 μm interposed therebetween.

Reference numeral 2 denotes a holder, which is provided at both ends of the laminated sheet 1 and has a tension so that the laminated sheet 1 does not sag. In FIG. 1, the laminate sheet 1 is horizontal, but it may be diagonal or vertical. Further, the holder 2 is connected to a driving device (not shown) for moving and rotating the holder 2. 3a and 3b are contact plates,
It is provided inside the fold of the plate laminate sheet 1, and is alternately applied from one surface side and the opposite surface side of the laminate sheet 1. Touch plate 3
Each of a and 3b is made of metal such as aluminum or stainless steel, ceramic or high density plastic having an appropriate width and thickness, which has sufficient rigidity so as not to be deformed by the tension generated during bending. In addition, a method of coating an inorganic or organic substance on the surface to improve the metal contamination of the plate laminate sheet 1 and the workability of taking out the plate laminate sheet 1 can be used. Further, the backing plates 3a, 3b are connected to a driving device (not shown) for moving the backing plates 3a, 3b.

FIG. 1B shows a state during bending. When the laminated sheet 1 is horizontal, the upper surface side contact plate 3a of the laminated body sheet 1 is moved downward and the lower surface side contact plate 3b of the laminated body sheet 1 is moved upward, but If either one of the upper side application plate 3a of the laminated sheet 1 or the lower side application plate 3b of the laminated sheet 1 is moved up or down, the laminated sheet 1 is relatively upper surface of the laminated sheet 1. Side contact plate 3a and laminate sheet 1
It means that both of the bottom side plate 3b are pressed.
FIG. 1 (c) shows a laminate sheet 1 in which the holder 2 and the contact plates 3a, 3b are brought together to the end and then removed from the holder 2 and the contact plates 3a, 3b, and the anode foil is fragile and can be bent. If not, the strip-shaped anode foil is then sandwiched between the laminate sheets. FIG. 1D shows a state in which the laminate sheets 1 are brought together without a gap due to their own weight or external pressure.

FIG. 2 illustrates an example of the movement of the contact plates 3a and 3b during bending according to the present invention, divided into various cases. 2A is a state before being folded, the laminated sheet 1 is pulled out from the unwind reel 4 and stretched horizontally by the pair of holders 2 (hereinafter, this plane X-Y is a reference plane). . Further, inside the folds of the laminate sheet 1, the fold-applying plates 3a and 3b are provided. The top plate 3a and the bottom plate 3b of the laminate sheet 1 are alternately applied. 2 (b) shows that while the holder 2 is rotated in the folding direction of the laminated sheet 1, the upper surface side application plate 3a of the laminated body sheet 1 is downward and the lower surface side application plate 3b of the laminated body sheet 1 is The state is shown in which the sheets are pushed toward the center while being pushed upward (the laminated sheet 1 that has been folded and folded is located substantially at the center of the reference plane XY).
2 (c) shows that while the holder 2 is rotated in the folding direction of the laminated sheet 1, the upper surface side contact plate 3a of the laminated body sheet 1 is downward, and the lower surface side contact plate 3b of the laminated body sheet 1 is rotated.
While pushing it upwards, the holder 2 on the side of the unwind reel 4
Shows a state in which they are moved toward each other (the folded laminated sheet 1 is located at approximately the center of the reference plane XY). FIG. 2D shows the holder 2 with the laminated sheet 1
While rotating in the folding direction of 1 and following in the direction of the laminate sheet 1, the top plate 3a of the laminate sheet 1 is pushed in the horizontal direction and the bottom plate 3b of the laminate sheet is pushed upward, The state where they are brought together toward the center is shown (the folded laminated sheet 1 is located above the reference plane XY). 2 (e) shows that while the holder 2 is rotated in the folding direction of the laminate sheet 1 and moved in the direction of the laminate sheet 1, the contact plate 3a on the upper surface side of the laminate sheet 1 is laminated in the horizontal direction. While the pushing plate 3b on the lower surface side of the body sheet 1 is pushed upward, it is brought closer to the holding tool 2 on the unwind reel 4 side (the laminated body sheet 1 folded and put together is the reference plane X-.
Located above Y).

In the bending mechanism shown in FIG. 2B, the moving distance of the contact plate is short and the bending speed is short among the four types, but the mechanical structure is most complicated. 2 (e)
In the folding mechanism of No. 4, the moving distance of the contact plate is long and the folding speed is slow among the four methods, but since the contact plate 3a on the upper surface side of the laminate sheet 1 moves only in the horizontal direction, the mechanical structure is complicated. Relatively reduced, and bending accuracy is easily obtained.

[0012]

As described above, it is possible to provide a bending mechanism for an electronic component element having high dimensional accuracy, which is capable of reducing the damage to the element that occurs in the process of folding the multiplication table while improving the manufacturing efficiency as described above. it can.

[Brief description of drawings]

FIG. 1 is a view for explaining a mechanism for folding a laminate sheet of the present invention.

FIG. 2 is a diagram for explaining the movement of the contact plate during bending in the present invention.

FIG. 3 is a diagram for explaining a conventional example.

FIG. 4 is a diagram for explaining a case where the manufacturing efficiency of the conventional example is improved.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Laminated sheet 2 ... Holders 3a, 3b ...
4 ... unwind reel 5 ... creasing type 6 ... creasing continuous type.

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Claims (2)

[Claims] 1. A mechanism for folding a laminate sheet of an electrode sheet and a separator in a multiplication table form, wherein a pair of holders for holding both ends of the laminate sheet and a fold of the laminate sheet between the holders are provided. A plurality of contact plates positioned inside, while applying tension to the laminate sheet by the holder, while relatively pressing the laminate sheet with the contact plate, one of the holder, the A folding mechanism for an electronic component element, comprising bending a plurality of contact plates and the other holder in this order to fold the laminate sheet. 2. A mechanism for folding a laminate sheet of an electrode sheet and a separator into a multiplication table, and a pair of holders for holding both ends of the laminate sheet, and a fold line of the laminate sheet between the holders. A plurality of contact plates located inside, while applying tension to the laminate sheet by the holder, while pressing the laminate sheet with the contact plate on one surface of the laminate sheet, one of the A bending mechanism for an electronic component element, which bends the laminate sheet by bringing the plurality of contact plates and the other holder in this direction toward the holder in this order.