JPS58154178A - Manufacture of roll type battery - Google Patents

Abstract

PURPOSE:To provide uniform discharge reaction by winding a separator on to an electrode without formation of wrinkles. CONSTITUTION:A continuous cathode plate 5 holding a cathode mass 6 on a cathode current collector 7 is covered on its both sides with two continuous separator 8 and 8 which are slightly wider than the cathode plate 5. When the separator 8 is wound together with an anode plate 1 or the cathode plate 5, the separator 8 inside the cathode plate 8 and the separator 8 outside the cathode plate are free to each other due to no bonding, and the inside separator 8 slides gradually to the outside separator 8 and these separators are wound between the anode plate 1 and the cathode plate 5 without wrinkles, although these winding diameters are different. After winding, the part 15 to be bonded of the separator 8 inside the cathode plate 5 and the part 15 to be bonded of the separator 8 outside the cathode plate 5 are bonded by heating.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a spiral battery such as a lithium battery or a silver battery, and particularly to a method for manufacturing a spiral battery having a structure in which at least one electrode is covered with a separator. It is.

Figures 1 and 2 are a front view and a cut-away front view of a part of a spiral battery using a lithium battery as an example with # side.

The elongated shade *li:l is constructed by pressing a current collector 3 made of expanded metal onto a lithium plate 2. On the other hand, the elongated anode plate 5 is composed of an anode mixture 6 held by a current collector 7 made of expanded metal, and this anode plate 5 is formed by a separator 8 made of a non-woven fabric such as polypropylene fiber. Pre-wrapped.

The cathode plate 1 and the anode plate 5 are superimposed and wound around the cathode current collector rod 4 in a spiral shape.
Store it in. As shown in FIG. 2, the tip 3a of the cathode current collector 3 is spot welded to the 11th surface of the 1Iji electrode current collector 4, while the rear end 7m of the anode current collector 7 is attached to the anode mixture 6.
The inner ring 9, which protrudes more and is pressed against the inner peripheral surface of the inner peripheral surface by its elasticity, is inserted into the anode can lO, and the anode can 1 is inserted into the anode can lO.
An insulating plate 11 made of synthetic resin is interposed between the bottom of the can, the cathode plate l, and the cathode current collector rod 4. Further, an insulating ring 12 made of synthetic resin is interposed between the upper bent portion of the inner cover 9 and the cathode plate 1. The head of the cathode current collector 114 protrudes upward from the inner wall 9 and extends 11 m into the center of the inner surface of the cathode terminal plate 13. The outer periphery of the anode terminal plate 13 is connected to the anode can 1 through an annular gasket 14 made of synthetic resin.
'C#' is attached by the open end of 0.

The electrolyte for this battery is propylene carbonate and 1.2-
Add lithium perchlorate to a mixed solvent with dimethoxyethane
An I+IF organic liquid is used.

As the sm mixture 6, a mixture of manganese dioxide, phosphorous graphite, and polytetrafluoroethylene is used.

In the conventional battery of this kind, the separator 8 is interposed between the cathode plate l and the anode plate 50, as described above. A method of spinning 41 times in a vortex 4I shape together with other electrodes. ■ Seal the n1 parts in the long direction to form a bag, insert one ' polarization into the separator, and wind it in a spiral shape with other electrodes. How to turn ■Simply a long sebare 1-
There is a method in which the coil is interposed between the cathode plates and wound in a spiral shape. 1. This method (2) has no problems as long as the electrode is viscount-like and does not have the active material, but in general, the electrode is [il-like and the active material may fall off, so there is a risk of internal short circuit. There is almost no risk of internal short circuit in methods ① and ②, but when winding the electrode in a spiral shape, the separator located inside the separator and the separator located outside the t-pole have different diameters. As a result, wrinkles inevitably occur on the inner separator, which causes wrinkles to form between the separator 8 and the cathode plate 1 or between the separator 8 and the anode plate 6.
A gap is formed between the two. Like this! If there are gaps, the distribution of the electrolyte and the reaction area of the electrodes will become non-uniform, resulting in an increase in internal resistance and insufficient discharge performance.

The purpose of the present invention is to eliminate such drawbacks of the prior art,
An object of the present invention is to provide a spiral battery having excellent discharge performance.

In order to achieve this object, the present invention covers both sides of an elongated electrode with two elongated separators that are slightly wider than the electrode, and winds the electrode in a spiral shape. At least one of the separators 114 in the longitudinal direction is wired together beyond the electrode, and the overlapping portion is joined together and the surface of the wound electrode is covered with the separator. Next, the fee for implementing the present invention will be explained with reference to the drawings. Figure 3 shows the negative and i
* IIE 41 K A cut-away plan view showing the state in which winding is started. Figure 4 is a partial view of the cathode plate before sealing with both sides covered with separators. Figures 45 and 6 are schematic diagrams of the electrode winding arrangement. Front view and schematic side view of the machine, Figure 7 is its
- Pole winding is a partial front view of the separator seal portion of the device.

As shown in FIG. 3, the tip of the electrode current collector 3 protrudes slightly from the lithium plate 2, the anode plate 5, the separator 8, etc., and the tip 493m is a spot l on the @ side of the cathode collecting area Keyaki 4. ! be touched. In this way, the elongated cathode plate IK and elongated WI electrode plate 5 attached to the "C Yin** electric keyaki 4" are overlapped, and both sides of this - electrode plate 50 are entirely covered by two separators 8. Figure 4 is a foreshadowing diagram of this anode plate 5, which is a long length made of a net-like #j electrode current collector 7 made of L-kiss panda metal holding an anode mixture 6. The shaped cathode plate 5 is covered on both sides by two elongated separators 8.8, which are slightly wider than the anode plate 5.
2. This separator 8 is made of polypropylene with heat 0T.
It is mainly composed of Ii fibers, and the portions protruding from both sides of the anode plate 50 are fusion-bonded 15.
becomes.

As shown in FIG. 3, the tip of the anode plate 5 is completely covered by the tip 8aK of the separator 8, and if necessary, the tips 81 and 5 are heat-sealed to Ii in advance. It is also possible. Alternatively, a separator 8 folded in two may be used.

A cathode plate 1 and an anode plate 5 whose both sides are covered with separators 8 are stacked [, 11! The electrode current collector rod 4 is wound spirally around its outer periphery.The electrode winding device will be explained using Figures S5 to 7.1 As shown in Figure 5. Part 4 and part 4b of cathode current collector rod 4 are held by chucks 16, respectively, and these chucks 16 are rotatably supported by bearings 17. One chuck shaft 161 is connected to the PIl fist group 18
It is connected to the rotation @ of the drive motor 19 via. Therefore, when the cathode current collector rod 4 rotates once in the direction of the arrow 1# as shown in FIG.
In order to tightly wind this electric iris assembly 20 which is attached to the cathode current collector 44, its 41g
A plurality of pressure driven rollers 21 are in elastic contact with the outer periphery of one bar. Each driven roller 21 is uniformly pressed against the central axis of the cathode current collector rod 4 by a suppression spring 23 connected by a bearing 22't ji .

As the amount of l1g1 of the electrode polymer 20 increases, the diameter becomes larger, so that the pressure spring 23 is compressed accordingly, and the pressure driven roller 21 is gradually moved radially outward. Although not shown, the movement of the pressure driven roller 21 is guided by a guide member.

Separator 8 - cathode plate 1-? When attached to the l#m' plates 5 and the like, the separator 8 on the inside of the electrode plate 5 and the separator 8 on the outside are still fused together, and the separator 8 on the inside of the electrode plate 5 and the anode plate 5 Even if the winding diameter of the separator 8 on the outside 11 is different, the inner separator 8 may be shifted relative to the outer separator 8, but the anode plate 1 and the anode plate 5 can be connected without wrinkles. A clean 4 on the threshold! !
It can be attached.

After this electrical combination 20 is wound around the cathode current collector rod 4, the end portion of the separator 80 is thermally bonded by TLK. That is, as shown in FIG. The heating roller 24 and the receiver are sandwiched between the row 225 and the foreshadowing line which is relatively shifted as shown in FIG. Then, the fused parts 15' which are directly aligned are thermally fused together by the heat from the heating roller 24 having a built-in heater, and the surface of the anode plate 50 is completely covered by the two separators 8. This fusion between the fused 15 is carried out continuously over the entire length of the separator 8 in the longitudinal direction, so there is no chance of the active material falling off.

After the electrode polymer 20 is wound around the cathode current collector rod 4, the battery is assembled according to the wire method. Note that the structure of the 11Ed is similar to the conventional one described above, so a description thereof will be omitted.

In the above-mentioned example, the separator 80 has a single layer of fusion bonding 15 on both sides, but for example, only the bottom bonding layer 15 of the separator 8 is layered to form a bag shape, and the top of the separator 8 is left open. wide insulating ring 12 (Fig. J1-1
411) may be used to close the opening of the separator 8.

Although the heating row 224 was used in the above-described example, other heating means such as a radar beam or ultrasonic waves may be used as a further heating means for the separator 8.

Since the present invention has the above-mentioned configuration, it is possible to assemble the separator without any wrinkles, and as a result, a battery with excellent performance in which a 9-degradation reaction is carried out can be obtained.

[Brief explanation of the drawing]

Figures 1- and 2- are a front view and a cutaway plan view of a part of the spiral battery, and Figure 3 shows a cathode plate and an anode plate whose both sides are covered with a separator. FIG. 4 is a partial plan view of the anode plate before sealing with both sides covered with separators; FIGS. 5 and 86 are a schematic front view of the device for electrode winding and schematic IIi
FIG. 7 is a front view of the separator seal portion of the device in which the electrodes are wound. l...#Pole plate, 5...Mountain/Anode plate, 8...
...Separator, 15...Fusion, 2o...
. . . Electrode polymer, 24 . . . Heating roller. Figure 1 11 Figure 2 Figure 3 Figure 4 Atsushi Figure 5

Claims (1)

[Claims] The entire surface of both sides of a long electrode is covered with two long separators that are wider than the electrode. I
While winding the separators in a shape, trace the chain ends t'# of at least one of the flexible arms 14 of both separators beyond the poles,
The overlapping parts are joined together, II (b) and electroplated*m.
A method for manufacturing a spiral battery in which the cell is covered with a T separator.