JPH0582122A - Battery coil winding device - Google Patents

Abstract

PURPOSE:To manufacture easily a battery coil in which both positive and negative electrodes are opposed to each other over the circumference. CONSTITUTION:An inside electrode material 2 to be situated inside of a coil in the case of starting to wind the coil is formed in such a way that single sided electrode materials 2a and 2b impregnated with an active material on one side are superposed back to back upon each other, and there are provided winding out shafts 1 on which an original roll of the single sided electrode materials 2a and 2b is installed. Respective delivery devices 6 and electrode cutters 7 are controlled in such a way that the innermost circumference of an electrode is composed of the single sided electrode material 2a forming the outer surface of the inside electrode material 2 and the outermost circumference of the electrode is composed of the single sided electrode material 2b forming the inner surface of the inside electrode material 2. Both prevention of wasteful impregnation with the active material and improvement of an efficiency in use of a battery content volume can be obtained by means of the betterment without wasting the existing facilities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device for a battery coil which can obtain high output and high energy density. More specifically, in a battery coil in which a positive and negative electrode material in which an active material is attached to a current collector (usually a metal foil) is wound into a roll through a separator, the positive and negative electrodes face each other at the outermost and innermost circumferences. The present invention relates to a winding device for a battery coil, which eliminates a non-existing portion and enables more effective use of the space inside the battery coil.

[0002]

2. Description of the Related Art Conventionally, a device for winding a battery coil is as shown in FIG. 3 and will be described first.

In the figure, reference numeral 1 designates an unwinding shaft, four of which are provided. A raw material of an inner electrode material 2 in which an active material is attached to both surfaces of a current collector, and an outer electrode material in which an active material is attached to both surfaces in the same manner. The original 3 and the original 4 (2) of the separator 4 are mounted respectively. In the present specification, the inner electrode material 2
Is an electrode material positioned inside at the beginning of winding of the battery coil, which is usually a negative electrode. The outer electrode material 3 is an electrode material positioned outside the inner electrode material 2 at the beginning of winding the battery coil, and is usually a positive electrode.

A tab attachment device 5, a feeding device 6 and an electrode cutter 7 are provided in the drawing lines of the inner electrode material 2 and the outer electrode material 3. Further, 8 is a winding shaft, and 9 is a separator cutter. After the separator 4 is wound around the winding shaft 8 as shown in the drawing, the inner electrode material 2 and the outer electrode material 3 are fed to the winding shaft 8 by the feeding device 6. When it is fed out and started to be wound at the same time, and when it is wound to some extent, tabs are attached to the inner electrode material 2 and the outer electrode material 3 by the tab attaching device 5, and further, the inner electrode material 2 and the outer electrode material 3 are simultaneously wound by the electrode cutter 7. Is cut and wound so as to complete, and finally the separator 4 is cut by the separator cutter 9 to obtain a battery coil having a predetermined winding amount.

[0005]

However, in the battery coil manufactured by the above-described conventional winding device, both the inner electrode material 2 and the outer electrode material 3 function as electrodes having active materials attached on both sides. Despite being a surface, there is a portion where the positive and negative electrodes do not face each other at the outermost circumference and the innermost circumference, and the active material in this portion is wasted. Further, since the useless active material is attached, the utilization efficiency of the battery internal volume is reduced. In particular, when the active material is a bulky material such as carbon, it has a great influence on the utilization efficiency of the internal volume of the battery.

The output characteristics of the battery are improved in proportion to the area of the surface where the positive and negative electrodes face each other, and this area must be large in order to take out a large current. Particularly in a non-aqueous battery, since the conductivity of the electrolytic solution is low, the facing area of the positive and negative electrodes is required to be wider, and the occurrence of the portion where the positive and negative electrodes do not face each other becomes a problem that cannot be ignored.

The present invention has been made in view of the above problems, and an object of the present invention is to easily manufacture a battery coil having positive and negative electrodes facing each other over the entire circumference.

[0008]

To this end, in the present invention,
As shown in FIG. 1, an active material is adhered on one side, and two sheets are back-to-back with the active material adhering surface on the outer side. The inner electrode material 2 is provided with the unwinding shaft 1 which is respectively mounted and sends out the inner electrode material 2, and after the inner electrode material 2a constituting the outer surface of the inner electrode material 2 and the outer electrode material 3 are started to be wound, A feeding device 6 for arbitrarily feeding each of the single-sided electrode materials 2b forming the inner surface to start winding, and after the single-sided electrode material 2a and the outer electrode material 3 forming the outer surface of the inner electrode material 2 are completely wound up, The battery coil winding device is provided with an electrode cutter 7 that cuts each of the single-sided electrode materials 2b forming the inner surface of the inner electrode material 2 at an arbitrary position where the winding is completed. That.

[0009]

The battery coil obtained by this winding device is shown in FIG.
The innermost circumference is composed of the single-sided electrode material 2a forming the outer surface of the inner electrode material 2, and the outermost circumference is
It is composed of a single-sided electrode material 2b forming the inner surface of the inner electrode material 2.

In the present invention, the delivery device 6 is designed to deliver the one-sided electrode 2a forming the outer surface of the inner electrode 2 and the outer electrode material 3 so that the winding of the outer electrode material 3 is started at the innermost circumference. This is for forming the one-sided electrode 2a. In addition, the electrode cutter 7 is used for the inner electrode material 2
Single-sided electrode material 2 constituting the inner surface of the inner electrode material 2 after the winding of the single-sided electrode material 2a constituting the outer surface of the
What is cut so that the winding of b is completed is that the outermost periphery is the single-sided electrode material 2b that constitutes this inner surface.
It is to be configured with.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG.

In this embodiment, six unwinding shafts 1
Is provided, each of the one-sided electrode materials 2a and 2b constituting the inner electrode material 2, each of the one-sided electrode materials 3a and 3b constituting the outer electrode material 3, and two separators 4
Each of the original fabric is attached respectively.

The single-sided electrode materials 2a, 2b are made by attaching an active material to one side of a current collector usually made of metal foil.
The inner electrode material 2 is constructed by stacking the active material on the back side with the surface on which the active material is adhered. The same applies to the single-sided electrode materials 3a and 3b, and the outer surface electrode material 3 is constructed by stacking them back to back with the active material attachment surface facing outward.

The single-sided electrode material 2a constitutes the outer surface of the inner electrode material 2 (the outer surface side when rolled up), and the single-sided electrode material 3a constitutes the outer surface of the outer electrode material 3. A tab attachment device 5, a delivery device 6, and an electrode cutter 7 are sequentially provided in the drawing line of the single-sided electrode materials 2a and 3a. Also, single-sided electrode material 2
b constitutes the inner surface of the inner electrode material 2 (the inner surface side when rolled up), and the single-sided electrode material 3b constitutes the inner surface of the outer electrode material 3. A sending-out device 6 and an electrode cutter 7 are sequentially provided on the drawing line of the single-sided electrode materials 2b and 3b.

Each tab mounting device 5 may be the same as the conventional one, but the tabs 11 for extracting electric energy (see FIG. 2).
It is preferable that the reference) is welded or caulked to the surface of the single-sided electrode material 2a, 3a on which the active material is not attached, because the electrical connection becomes more reliable. Further, in this embodiment, the tab attachment device 5 is provided in the line of the single-sided electrode materials 2a and 3a, but the minimum single-sided electrodes 2a and 2b are provided.
It suffices if it is provided on either one of the lines and one of the single-sided electrode materials 3a and 3b.

In particular, the outermost peripheral surface of the battery coil obtained by this winding device is a surface to which an active material is not attached, as will be described later, and this surface is brought into direct contact with the battery can to electrically connect to the outside. When the connection is obtained, the single-sided electrode material 2a and / or 2 of the inner electrode material 2 forming the outermost periphery of the battery coil
It becomes unnecessary to attach the tab 11 to b, and only one tab attaching device is required, and it becomes easy to effectively use the volume in the battery can.

Each feeding device 6 includes a step motor 1
After the separator 4 is wound around the winding shaft 8 in the same manner as in the prior art, first, the single-sided electrode material 2a forming the outer surface of the inner electrode material 2 and the outer electrode material 3 are formed. Each of the single-sided electrode materials 2a, 2b, 3a, 3a, 3b is wound by the winding shaft 8 and then the single-sided electrode material 2b constituting the inner surface of the inner electrode material 2 is wound by the winding shaft 8. 3b is sent out. The sending timing is about 1 for the single-sided electrode material 2a forming the outer surface of the inner electrode material 2 and for the single-sided electrode materials 3a and 3b forming the outer electrode material 3.
The timing at which the remaining one-sided electrode material 2b starts to be wound when it is wound around is most preferable.

Each electrode cutter 7 has a corresponding one-sided electrode material 2
It is the same as the conventional one that the a, 2b, 3a and 3b are cut with a predetermined winding length. However, each of the electrode cutters 7 in the present invention first cuts the single-sided electrode material 2a forming the outer surface of the inner electrode material 2 and the single-sided electrode materials 3a and 3b forming the outer electrode material 3 so as to complete the winding. After that, the one-sided electrode material 2b forming the inner surface of the inner electrode material 2 is cut so that the winding is completed. The timing of this cutting is the one-sided electrode material 2b forming the inner surface of the inner electrode material 2.
However, it is most preferable that the timing is such that the outer electrode material 3 is wound around the outermost circumference by one round.

The processing after the completion of the winding of the inner electrode material 2, the outer electrode material 3 and the separator 4 is the same as in the conventional case, the new winding shaft 8 is moved to the winding position, the tip of the separator 4 is wound, and the next winding is performed. In addition to the preparation, the separator cutter 9 cuts the separator 4 between the wound-up battery coil and the wound-up completed battery coil with the adhesive tape 12 (see FIG. 2) at the outermost end. Complete.

According to this winding device, the battery coil in the state shown in FIG. 2 can be obtained. The innermost circumference thereof is composed of the single-sided electrode material 2a forming the outer surface of the inner electrode material 2, and the outermost circumference is composed of the single-sided electrode material 2b forming the inner surface of the inner electrode material 2. Innermost single-sided electrode material 2a
The inner surface side and the outer surface side of the outermost one-sided electrode material 2b are surfaces on which no opposing electrodes exist, but both surfaces are surfaces on which no active material is attached and which do not function as electrodes. .. Therefore, the electrode surfaces of the battery coil obtained by the present winding device are all surfaces facing the other electrode surfaces. In addition, in the winding device of FIG.
The outer electrode material 3 is also formed by stacking the single-sided electrode materials 3a and 3b back to back, and the outer electrode material 3 also has two unwinding shafts 1. However, the outer electrode material 3 is the same as the conventional one. In addition, a material in which an active material is attached to both surfaces of a current collector can be used. In this case, one unwinding shaft 1 for the outer electrode material 3 can be reduced,
The total unwinding shaft can be five. In particular,
It is possible to omit the unwinding shaft 1 to which the raw material of the single-sided electrode material 3b constituting the inner surface of the outer electrode material 3 is mounted and the device on that line.

As shown in FIG. 1, when the outer electrode material 3 is also composed of two single-sided electrode materials 3a and 3b, unlike the battery coil shown in FIG.
The outermost circumference may be formed of the single-sided electrode material 3b forming the inner surface of the outer electrode material 3. In this case, each feeding device 6 may be the same as that described above, and each electrode cutter 7 may be as follows.

That is, both single-sided electrode materials 2a and 2b constituting the inner electrode material 2 and the single-sided electrode material 3a constituting the outer surface of the outer electrode material 3 are cut so as to complete the winding, and then the outer electrode material 3 is cut. The one-sided electrode material 3b forming the inner surface may be cut so as to complete the winding. The timing of this cutting is the outer electrode material 3
The single-sided electrode material 3b constituting the inner surface of the
The timing at which the length is such that the outer surface of the single-sided electrode material 3a is wound up by about one outermost circumference is most preferable.

[0023]

The present invention is as described above and has the following effects.

(1) There is no portion where the positive and negative electrodes do not face each other, and a battery coil having a high electrode utilization efficiency is obtained, and waste of the material due to the attachment of the active material to the portion where the positive and negative electrodes do not face each other and the attachment of this active material. It is possible to prevent a decrease in utilization efficiency of the battery internal space due to.

(2) Other than the addition of the drawing line by adding the winding shaft 1, the conventional winding device can be used by simply improving the operation control system of the feeding device 6 and the electrode cutter 7. It can be obtained without wasting existing equipment.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a winding device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a battery coil obtained by the winding device shown in FIG.

FIG. 3 is an explanatory view of a conventional winding device.

[Explanation of symbols]

 1 Unwinding shaft 2 Inner electrode material 2a Single-sided electrode material 2b Single-sided electrode material 3 Outer electrode material 3a Single-sided electrode material 3b Single-sided electrode material 4 Separator 5 Tab attachment device 6 Feeding device 7 Electrode cutter 8 Winding shaft 9 Separator cutter 10 Step motor 11 tabs 12 adhesive tape

Claims (1)

[Claims] 1. An active material is attached to one surface, and two raw sheets of one-sided electrode material constituting an inner electrode material are attached with the active material attachment surface to the outside and the two sheets are placed back to back, and this is sent out. An unwinding shaft is provided for the inner electrode material, and after the winding of the single-sided electrode material and the outer electrode material that form the outer surface of the inner electrode material is started, the winding of the single-sided electrode material that forms the inner surface of the inner electrode material is started. As described above, a feeding device for arbitrarily feeding each one, and after the winding of the one-sided electrode material forming the outer surface of the inner electrode material and the outer electrode material is completed, the winding of the single-sided electrode material forming the inner surface of the inner electrode material is completed. A battery coil winding device, characterized in that an electrode cutter for cutting each at a position is provided.