JP2005026039A - Manufacturing method of swirl-shaped electrode group - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode group capable of securing reliability without stress due to bending of an electrode plate generated as a group diameter gets large by winding. <P>SOLUTION: In a process of manufacturing a swirl-shaped electrode group by winding a positive electrode plate and a negative electrode plate through a separator, an electrode plate is supplied from a tangential direction toward the electrode group at a contact point between the electrode group in the process of winding, and the bending at exit of an electrode supply table is eliminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a spiral electrode group formed by winding a positive electrode plate and a negative electrode plate via a separator.
[0002]
[Prior art]
In recent years, with the development of various portable electrical devices, the development of the battery as a driving power source is regarded as one of important key devices. Among these batteries, rechargeable nickel-metal hydride batteries and lithium-ion secondary batteries, such as small-sized secondary batteries, are used as power sources for hybrid electric vehicles in recent years, including cell phones, laptop computers, and video cameras. However, the development is progressing and the demand is increasing.
[0003]
As shown in FIG. 3, the electrode group used in the battery includes a winding core 1 rotated by a rotation driving device (not shown) and sandwiching it. An electrode plate supply table 7 for conveying the positive electrode plate 4 and an electrode plate supply table 7 for conveying the sheet-like negative electrode plate 5 are arranged. The positive electrode plate 4 and the negative electrode plate 5 are respectively set at predetermined positions of the electrode plate supply table 7, and the separator is sandwiched between the winding cores 1.
[0004]
Thereafter, the core 1 is rotated by a predetermined amount, and the positive electrode plate 4 and the negative electrode plate 5 are wound around the core 1. (For example, refer to Patent Documents 1 and 2).
[0005]
In such a conventional winding process, as shown in FIG. 4, since the position of supplying the electrode plate is fixed, the electrode plate at the outlet of the electrode plate supply table 7 as the group diameter increases. This could cause bending of the electrode, causing a large stress on the electrode, causing the active material to fall off and causing an internal short circuit.
[0006]
[Patent Document 1]
JP 2001-319680 A [Patent Document 2]
Japanese Patent Laid-Open No. 9-147878
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a method of manufacturing a spiral electrode group that can ensure reliability without imposing a large stress on an electrode plate.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the manufacturing method of the present invention includes a step of winding a positive electrode plate and a negative electrode plate via a separator to produce a spiral electrode group. The electrode group is supplied from the tangential direction to the electrode group at the contact point between the electrode group and the supplied electrode plate.
[0009]
According to this means, as the diameter of the electrode group becomes larger due to the winding, it is possible to prevent problems such as bending of the supplied electrode plate and causing damage to the electrode plate, and a highly reliable spiral electrode group Can be configured.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings. In addition, the same part as a prior art example attaches | subjects and demonstrates the same code | symbol. Further, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within a range not changing the gist thereof.
[0011]
FIG. 1 is a perspective view showing a state in which a spiral electrode group according to the present invention is wound. FIG. 2 shows a system for forming a spiral electrode group according to the present invention.
[0012]
That is, the apparatus constituting the electrode group 2 is wound around the core 1 via a separator between at least the positive electrode plate 4 and the negative electrode plate 5 supplied from the electrode plate supply table 7 to form the electrode group 2. And a pair of pressure rollers 3 for pressurizing the electrode group 2 at the time of winding and winding without loosening.
[0013]
At this time, it is supplied by the output of the sensor (displacement meter 9 in FIG. 2) that measures the winding end position of the electrode group 2 in the winding process, that is, the contact position between the outer circumferential circle of the electrode group and the supplied electrode plate. The controller 10 calculates an appropriate position of the electrode plate table 7 so that the positive and negative electrode plates 4 and 5 are supplied from the tangential direction of the outer circumference circle of the electrode group at each of the contact positions, and the electrode plate table is located at that position. 7 is moved.
[0014]
In FIG. 2, the position of the pair of pressure rollers 3 is about 45 ° in angle.
You may arrange | position in the rotation direction of winding. In this way, the apparatus is advantageous because it does not interfere with each mechanism on the system, but the electrode group is liable to be loosened or wrinkled. Therefore, as shown in FIG. 2, the pressure roller 3 holds the contact position. Is the best.
[0015]
With the above system, as the group diameter of the electrode group 2 becomes larger, bending of the electrode plate occurs at the outlet of the electrode plate supply table 7, and a large stress is applied to the electrode plate, causing the active material to fall off. Thus, it is possible to suppress problems such as causing an internal short circuit, and it is possible to configure a spiral electrode group with excellent reliability.
[0016]
(Example)
An embodiment of the present invention will be shown below.
[0017]
A positive electrode plate having a width of 45 mm, a length of 200 mm, and a thickness of 0.52 mm containing nickel hydroxide as an active material, and a negative electrode plate having a width of 45 mm, a length of 340 mm, and a thickness of 0.33 mm containing a hydrogen storage alloy as an active material Using the separator made of polypropylene subjected to hydrophilic treatment, 1000 pieces of electrode groups were produced with the apparatus of the present invention shown in FIG. 1 and FIG. 2, and then an internal short circuit inspection was performed, but no defects occurred. .
[0018]
On the other hand, when a group of electrodes was made of the same material as described above using the conventional configuration apparatus shown in the figure for comparison, 2.4% internal short-circuit failure occurred.
[0019]
【The invention's effect】
As described above, if the spiral electrode group is configured using the system for supplying the electrode plate from the tangential direction to the electrode group at the contact point between the electrode group in the winding process and the supplied electrode plate, as described above. In addition, a large stress is applied to the electrode plate, and it is possible to suppress problems such as the active material falling off or causing an internal short circuit, and a highly reliable spiral electrode group can be configured.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration process of an electrode group according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a system for configuring a spiral electrode group according to the present invention. FIG. 4 is a perspective view showing a configuration process of an electrode group. FIG. 4 is an explanatory view showing a configuration process of an electrode group according to a conventional embodiment.
DESCRIPTION OF SYMBOLS 1 Core 2 Electrode group 3 Pressure roller 4 Positive electrode plate 5 Negative electrode plate 6 Pressure mechanism 7 Electrode plate supply table 8 Supply table moving mechanism 9 Displacement meter 10 Controller

Claims (3)

In the step of winding the separator between the positive electrode plate and the negative electrode plate to produce a spiral electrode group, at least one of the positive electrode plate and the negative electrode plate is supplied with the electrode group in the winding process. A method of manufacturing a spiral electrode group supplied from a tangential direction to the electrode group at a contact point with the electrode plate. 2. The method of manufacturing a spiral electrode group according to claim 1, wherein the supply position of the electrode plate is moved following the contact position between the electrode group in the winding process and the supplied electrode plate. A sensor for detecting the position of the contact point between the electrode group in the winding process and the supplied electrode plate, and the position of the electrode plate supply table for supplying the electrode plate according to the detected position are moved to change the position of the contact point. The manufacturing method of the spiral electrode group of Claim 2 adjusted so that an electrode plate may be supplied from the tangent direction to an electrode group.

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