JPS5832372A - Cell - Google Patents

Abstract

PURPOSE:To make the quality uniform by forming the liquid path in the negative plate conducting between the front and rear thereby facilitating the permeation of the electrolyte permeated to the plate group at the inner-circumferential section to the plate group at the outer-circumference thus facilitating the liquid injection of the electrolyte to the plate group. CONSTITUTION:The negative plate 10 is constituted of a current collecting board 11 having many openings where one end is spot welded to the side face of the current collecting rod 2 and a metal lithium board 12 pressed to its one face, where an exposed groove 10a of the current collecting board 11 is formed except a portion of lithium. The electrolyte to be injected to the space through the liquid path 2a of the current collecting rod 2 will permeat from the end face of the plate group exposed to the space 9 at the inner-circumferential section 1a of the plate group 1 while the groove 10a in the negative pole 10 will function as the liquid path for sucking the liquid. The liquid will permeat through the opening in the current collecting board 11 to the outer-circumferential section 1b of the plate group to improve the permeation speed of the liquid, thus to shorten the liquid injection process thereby the sufficient amount of electrolyte for the plate group can be impregnated uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrode plate group in which positive and negative electrode plates are spirally wound around a current collecting rod of one electrode with a separator interposed therebetween; The present invention relates to an improvement in a battery including an assembly including a sealing plate fitted with a sealing backing.

More specifically, the object is to facilitate the operation of pouring electrolyte into the electrode plate group using this assembly, and to provide a battery of constant quality.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 shows the overall structure of a battery according to the present invention.

Reference numeral 1 denotes a group of electrode plates that are spirally wound around the negative electrode current collector rod 2 . 31/i A metal interior housing a group of electrode plates,
The upper end has an inward facing flange 3a, and the upper part of the current collecting rod 2 protrudes from the inner part.

Reference numeral 4 denotes a sealing plate with a sealing packing 6 made of polypropylene fitted to its outer periphery.The inner surface of the sealing plate 4 is spot-welded to the upper end of the current collector rod 2, and the bottom of the backing 6 is sealed with a sealant 6 such as pitch. It is adhered to the flange 3a.

7 is a metal outer can that also serves as a positive electrode terminal, 8 is a bottom insulating plate, and the open end of the outer can 7 is caulked to the periphery of the sealing packing 5. The electrolytic solution used is one obtained by dissolving 1 mol/l of lithium perchlorate in a mixed solvent of propylene carbonate and 1,2-dimethoxyethane.

In the battery configured in this way, when the collar part 3a of the inner part 3 acts as a backing seat 60, the current collecting rod 2 is attached to the sealing plate 4.
Since the plate group 1 is firmly fixed by the inner case 3 and the outer case 7, it is resistant to vibration and shock, and is suitable for high-energy batteries such as organic electrolyte batteries. Suitable for density batteries.

However, as described above, with the structure using an assembly in which the internal plate 3 housing the electrode plate group and the sealing plate 4 fitted with the backing 6 are used, there is a difficulty in the electrolyte injection process. hand,
There have been disadvantages such as leakage during the assembly process, and failure to have a sufficient amount of electrolyte in the electrode plate group, thereby failing to bring out sufficient discharge performance.

In other words, by injecting -44 electrolyte into the outer can 7, the assembly speed cannot be increased, and the space 9 is reduced in productivity.
Since it is sealed, there is no place for the air that should be replaced with the liquid penetrating into the electrode plate group to escape, further restricting the amount of electrolyte in the electrode plate group.

The following proposals have been made to eliminate these inconveniences. That is, the above-mentioned assembly is turned upside down as shown in FIG. 4 and the liquid is injected. In this case, the sealing plate 4, the backing 5, and the interior 3 form a container with only the upper part open in the figure, and the space 9 inside the sealing plate is used as a liquid storage area, and the current collector rod 2 passes through the liquid passage there. The liquid is injected through the tube. The current collector rod 2 is a hollow pipe with a part of its circumference cut out in the vertical direction. Use the chips as liquid. Alternatively, a hollow pipe may be used and an opening for liquid outflow may be provided near the sealing plate exposed to the space 9.

With this method, it is possible to inject liquid by inserting the nozzle of the liquid injection device into the opening of the current collector rod in the upper part of the figure, and the liquid level of the electrolyte injected into the space 9 rises, causing the electrode plate to rise. Once the liquid reaches the end face of the group, it easily penetrates into the electrode group due to capillary action. Moreover, since the air to be replaced with the liquid escapes into the atmosphere through the opening above the electrode group, the liquid permeates quickly. Furthermore, if the outer can is placed upside down in this state and covered from above, the battery can be assembled without leaking the liquid to the outside.

However, even with this method, there are still problems that cannot be improved. This is due to incomplete penetration of the liquid into the spirally wound outer peripheral portion 1b of the electrode plate group. Since the end face of the outer periphery of the electrode plate group is in contact with the flange 3a of the inner plate 3, there is no direct contact with the liquid in the space e, and therefore the electrolytic solution that has permeated into the inner periphery 1a moves toward the outer periphery. However, since light metal negative electrodes such as lithium do not have liquid permeability, they must be permeated through a spiral separator. For this reason, the time required to inject a predetermined amount of liquid has become long.

The present invention solves this problem, and is characterized in that a liquid passageway communicating with the front and back sides of the negative electrode plate is formed.

According to this configuration, the electrolytic solution that has permeated the electrode plate group in the inner peripheral portion as described above can easily permeate into the electrode plate group in the outer peripheral portion through the liquid passage of the negative electrode.

FIG. 2 shows an embodiment of the negative electrode used in the present invention.

This negative electrode plate 10 is composed of a current collecting plate 11 having a large number of holes, one end of which is spot welded to the side surface of the current collecting rod 2, and a metal lithium plate 12 crimped to one side of the current collecting plate 11. A portion of the lithium is removed in the axial direction to form an exposed groove 10a of the current collector plate 11.

FIG. 3 shows an electrode plate group in which a positive electrode plate 14 surrounded by a separator 13 is superimposed on the negative electrode plate 10, and the electrode plate is spirally wound around the current collecting rod 2 as the winding center. Note that the separator 13 was made of polyglopylene nonwoven fabric. In addition, the positive electrode plate 14 includes a current collecting net 16 containing a mixture 15 containing manganese dioxide as an active material.
The end of the net 16 is exposed at the end of the spiral and is in contact with the inner wire 3.゛According to such a configuration, as shown in Fig. 4, the current collector rod 2
The electrolytic solution injected into the space through the liquid passage 2a easily permeates the inner circumferential portion 1a of the electrode plate group 1 from the end face of the electrode plate group exposed to the space 9. At this time, the groove 1 of the negative electrode 1o
0a functions as a liquid passageway for sucking up liquid. The electrolytic solution thus absorbed into the inner peripheral part of the electrode plate group permeates into the outer peripheral part 1b of the electrode plate group through the opening of the current collecting plate 11 exposed in the groove 10a. Compared to osmosis, the rate of liquid osmosis can be significantly improved.

Therefore, it is possible to shorten the liquid injection step in the battery assembly process, and to evenly impregnate the electrode plate group with a sufficient amount of electrolyte.

Organic electrolyte batteries require a large amount of electrolyte to achieve sufficient discharge, and the active light metal negative electrode, such as lithium, is prevented from reacting with moisture before sealing.

To prevent this, it must be assembled in low humidity conditions.

Unlike conventional methods, it takes a long time to inject liquid under low humidity.

It has been difficult to manufacture batteries of constant quality due to variations in the amount of electrolyte due to evaporation of the electrolyte, but according to the present invention, such inconveniences can be overcome.

In the above example, as the most preferred embodiment, the vertical groove 10a is provided in the negative electrode 10, but it is also possible to provide only a liquid passageway that communicates with the front and back sides of the negative electrode. This liquid passage can be formed by partially punching holes in the negative electrode or by partially exposing the current collector plate and using the openings as liquid passages.

As is clear from the above, according to the present invention, it is possible to infiltrate the electrolyte into the entire electrode plate group almost uniformly and quickly, which not only shortens the injection process but also ensures constant quality. A battery with excellent discharge performance can be obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing one embodiment of the battery of the present invention, and FIG.
The figure is a perspective view of the negative electrode plate, and Figure 3 is a cross-sectional view of the electrode plate group.
FIG. 4 is an inverted vertical cross-sectional view of a conventional assembly including a group of electrode plates. 1... Electrode plate group, 2... Current collector rod, 2 &...
...Liquid passage, 3...Internal rental, 3a...
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・．
Packing, 6...Sealant, 7...Outer can,
9...Space part, 1o...Negative electrode plate, 10
a , , , , groove C liquid passage), 11400600.
・Current collector plate, 13... Serrator, 14...
... Positive & board. Name of agent: Patent attorney Toshio Nakao and 1 other person! 1
Figure 2 Figure 3

Claims (2)

[Claims] (1) An electrode plate group consisting of a positive electrode plate and a negative electrode plate spirally wound through a separator around a current collector rod having a liquid passage leading from the lower end opening to an opening near the upper end, and an inward flange at the upper end. and a sealing plate that is closely attached to a flange of the inner plate that houses the electrode plate group, and the negative electrode has a plurality of liquid passages that communicate with the front and back sides of the negative electrode. (2) The battery according to claim 1, wherein the liquid passageway of the negative electrode is formed by a vertical groove provided with a porous negative electrode current collector exposed.