JPH0524120Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is a bobbin-type non-contact structure in which a cylindrical negative electrode made of a light metal such as lithium is covered with a separator and loaded into a cylindrical positive electrode mixture. Related to improvements in water electrolyte batteries.

<<Prior Art>> A typical conventional structure of this type of bobbin type non-aqueous electrolyte battery is shown in FIG.

The battery with the structure shown in FIG. 3 consists of a bottomed cylindrical positive electrode can 10 which also serves as a positive terminal and is the main body of the cylindrical battery case, and a cylindrical shape that is placed in close contact with the inner circumference of the positive electrode can 10 is pressurized. Molded positive electrode mixture 12
A separator 14 made of polypropylene nonwoven fabric or the like is disposed in close contact with the inner circumference of the positive electrode mixture 12 in a cylindrical shape, and the upper end thereof protrudes appropriately from the upper end of the positive electrode mixture 12, and the inner circumference of this separator A cylindrical lithium negative electrode 16 closely placed on the side, a non-aqueous electrolyte 24 filled in the positive electrode can 10, and a dish-like shape having a center hole 18a for insertion of a lead plate and for liquid injection, A sealing gasket 18 made of synthetic resin is fitted to the upper opening of the positive electrode can 10 so as to close the opening, and the lower surface thereof is in contact with the upper edge of the separator 14. It is composed of a negative electrode terminal plate 20 that seals the positive electrode can 10, and a lead plate 22 that is wired through the center hole 18a of the sealing gasket 18 and connects the negative electrode 16 and the negative electrode terminal plate 20.

A battery with this structure is generally assembled as follows. First, the positive electrode mixture 12, the separator 14, and the negative electrode 16 are loaded into the positive electrode can 10. One end of a lead plate 22 is connected to the inner surface of the negative electrode 16.
The other end of this lead plate 22 is sealed with a gasket 18.
through the center hole 18a and spot welded to the inner surface of the negative electrode terminal plate 20.

Next, the sealing gasket 18 is fitted into the upper opening of the positive electrode can 10, and the non-aqueous electrolyte 2 is poured from the center hole 18a.
Pour 4 into the can. When a predetermined amount of electrolyte 24 has been injected, the negative electrode terminal plate 20 is fitted onto the upper surface of the sealing gasket 18, and the upper opening edge of the positive electrode can 10 is curled inward to close the sealing gasket 18.
Compress the peripheral part of.

<<Problems to be solved by the invention>> In the conventional battery assembly procedure described above, when the sealing gasket 18 is fitted into the upper opening of the positive electrode can 10, the upper edge of the separator 14 comes into contact with the lower surface of the sealing gasket 18. . Since the separator 14 is made of a material with appropriate elasticity and rigidity,
The circular upper edge of the separator 14 uniformly contacts the lower surface of the sealing gasket 18, and the contact force is also relatively large.

As a result, the upper space inside the positive electrode can 10 is filled with the separator 1 which is in contact with the lower surface of the sealing gasket 18.
4, the separator 14 is divided into an inner space A and an outer space B.

Next, the electrolyte 24 is injected into the interior through the center hole 18a of the sealing gasket 18. It first enters here, is impregnated into the separator 14, and gradually penetrates to the positive electrode mixture 12 side on the outer peripheral side.

The problem here is that the electrolyte 2 is in the separator 14.
4 impregnated, the contact area between the lower surface of the sealing gasket 18 and the upper edge of the separator 14 becomes liquid-tight, and the air permeability between the inner space A and the outer space B is significantly reduced. . The electrolyte 24 flows from the inner space A to the outer space B and the positive electrode mixture 12 side.
In order for the air to permeate, the air in the outer space B must escape to the outside. In other words, air and electrolyte 2
4 must be replaced. Outer space B
The air exhaust path passes through the separator 14 and reaches the inner peripheral space A, and further passes through the sealing gasket 1.
8 through the center hole 18a. However, as described above, since the air permeability between the space B and the space A is reduced, it takes a very long time to replace the electrolytic solution 24 with air (air removal). In some cases, it may be necessary to inject a certain amount of electrolyte, wait for a while, and then inject the electrolyte again.

As described above, in the past, the electrolyte injection process took a long time, which was an obstacle to speeding up the battery assembly line. Furthermore, if the injection is stopped when the electrolyte overflows without the air being completely removed, the amount of electrolyte will eventually become insufficient and the battery performance will deteriorate. Further, if the electrolytic solution does not permeate well and overflows, and the electrolytic solution adheres to the upper surface of the sealing gasket 18 and the battery is sealed with the negative terminal plate 20, the leakage resistance of the battery will deteriorate.

This idea was devised in view of the conventional problems mentioned above, and its purpose is to create a structure that allows the internal gas to escape quickly when the electrolyte is injected, and to obtain a highly efficient and high-performance bobbin type non-aqueous electrolyte battery. The purpose is to do so.

<Means for Solving the Problems> Therefore, in this invention, in a bobbin type non-aqueous electrolyte battery having the basic structure as shown in Fig. 3, a space located on the outer periphery of the separator on the bottom side of the sealing gasket and a , has a ventilation structure that communicates with the space on the upper surface side of the sealing gasket, and the ventilation structure is a ventilation hole that penetrates the flat plate portion on the outer peripheral side of the hole of the sealing gasket, or an upper end protruding portion of the separator. It is characterized by consisting of either ventilation holes penetrating the inner or outer periphery.

《Operation》 Inject the electrolyte through the hole provided in the center of the above,
When the electrolyte penetrates into the outer circumferential side of the separator, the air in the space on the outer circumferential side of the separator escapes to the upper surface of the sealing gasket through the ventilation structure without any resistance. Therefore, air and electrolyte are quickly replaced, and the required amount of electrolyte can be injected in a short time.

<<Embodiment>> FIG. 1 shows a first embodiment of this invention.
The basic structure of this battery is the same as the conventional one shown in FIG.
A cylindrical positive electrode mixture 12 closely arranged on the inner circumferential side of the
A separator 14 is disposed in close contact with the inner periphery of the positive electrode mixture 12 in a cylindrical shape, and the upper end of which protrudes appropriately from the upper end of the positive electrode mixture 12; A cylindrical negative electrode 16, a non-aqueous electrolyte 24 filled in the positive electrode can 10, a flat plate portion with a hole 18a for lead plate insertion and liquid injection work drilled in the center, and this flat plate portion. It is formed into a dish shape with an annular part integrally provided on the periphery of the positive electrode can 10, and is fitted into the upper end opening of the positive electrode can 10 so as to close it, and its lower surface is connected to the separator 14.
A sealing gasket 18 in contact with the upper edge, a negative terminal plate 20 fitted onto the upper surface of the sealing gasket 18 to seal the positive electrode can 10, and a wiring connected to the negative electrode 16 through the center hole 18a of the sealing gasket 18. Lead plate 22 connecting with negative terminal plate 20
It is equipped with

In addition to the above basic structure, the battery of this embodiment has the center hole 18 in the sealing gasket 18.
A ventilation hole 18b is provided on the outer circumferential side of a and vertically penetrates the flat plate portion. This ventilation hole 18
b is the above-mentioned ventilation structure, and the outer peripheral side space B of the separator 14 communicates with the upper surface side space of the sealing gasket 18 via the ventilation hole 18b.

The battery assembly procedure is the same as the conventional battery described above, with the positive electrode mixture 12 and the separator 1 placed in the positive electrode can 10.
4. Load the negative electrode 16, and spot-weld the tip of the lead plate 22 previously connected to the negative electrode 16 through the center hole 18a of the sealing gasket 18 to the inner surface of the negative electrode terminal plate 20. Then, the sealing gasket 18 is fitted into the upper opening of the positive electrode can 10, and the electrolytic solution 24 is injected into the inside through the center hole 18a.

The injected electrolytic solution 24 first enters the cylinder of the negative electrode 16 and gradually permeates toward the outside of the positive electrode mixture 12 through the separator 14 . At this time, the air in the space B on the outer peripheral side of the separator 14 escapes to the outside without any resistance through the ventilation holes 18b, so that the electrolytic solution 24 and the space can be replaced in an extremely short time.

FIG. 2 shows a second embodiment of this invention.
In this embodiment, a plurality of ventilation holes 14a are provided in the upper end protruding portion of the separator 14, passing through the inner and outer peripheries.
A sealing gasket 18 is provided between the ventilation hole 14a and the sealing gasket 18.
The center hole 18a has the above-mentioned ventilation structure.

The assembly procedure of the embodiment shown in FIG.
, and from here the center hole 1 of the sealing gasket 18 is opened.
It passes through 8a to the outside without resistance.

<<Effects of the invention>> As explained in detail above, according to this invention, even with the simple improvement of providing a ventilation structure that connects the outer peripheral space of the separator and the upper surface space of the sealing gasket in a freely ventilable manner, the electrolyte can be At the time of injection, the internal air can be replaced with the electrolyte in a short time, and the time required for the electrolyte injection process can be significantly shortened compared to conventional methods, and overflow of the electrolyte, which can lead to deterioration of battery performance, almost never occurs. In other words, this type of bobbin type non-aqueous electrolyte battery with higher performance can be produced with higher efficiency. In addition, the ventilation structure for improving the electrolyte injection performance is composed of either a ventilation hole that penetrates the flat plate part of the sealing gasket or a ventilation hole that penetrates the upper end protrusion of the separator. Ventilation holes can be easily formed during molding or cutting the separator, and manufacturing is extremely inexpensive.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a battery according to a first embodiment of this invention, FIG. 2 is a sectional view of a battery according to a second embodiment of this invention, and FIG. 3 is a sectional view of a conventional battery. 10... Positive electrode can, 12... Positive electrode mixture, 14...
Separator, 14a...Vent hole, 16...Negative electrode,
18... Sealing gasket, 18a... Center hole, 1
8b...Vent hole, 20...Negative terminal plate, 22...
Lead plate, 24...Nonaqueous electrolyte.

Claims (1)

[Scope of utility model registration request] A cylindrical positive electrode can with a bottom, a cylindrical positive electrode mixture that is closely arranged on the inner periphery of the positive electrode can, and a cylindrical positive electrode mixture that is closely arranged on the inner periphery of the positive electrode can, and the upper end thereof. a separator that protrudes appropriately from the upper end of the positive electrode mixture, a cylindrical negative electrode that is closely arranged on the inner circumferential side of the separator, a non-aqueous electrolyte filled in the positive electrode can, and a lead plate for insertion. The positive electrode can is formed into a dish shape with a flat plate part with a hole for liquid injection in the center and an annular part integrally provided on the periphery of the flat plate part. a sealing gasket that is fitted so as to close the flat plate portion and whose lower surface is in contact with the upper edge of the separator; a negative electrode terminal plate that is fitted and attached to the upper surface of the sealing gasket to seal the positive electrode can; In a bobbin type non-aqueous electrolyte battery comprising a lead plate that is wired through the hole of the sealing gasket and connects the negative electrode and the negative electrode terminal plate, a space located on the outer periphery of the separator on the lower surface side of the sealing gasket. and a space on the upper surface side of the sealing gasket. A bobbin type non-aqueous electrolyte battery characterized by having a vent hole that penetrates the inner and outer peripheries at parts.