JPS6020286Y2 - sealed battery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvement of a sealed battery, and aims to provide a sealed battery with improved current collection effect and low internal resistance.

For example, in a sealed battery such as a spiral battery, when sealing, the opening of the battery container, which is usually used as an anode can, is tightened inward, and the inner circumferential surface is fitted around the periphery of the cathode terminal plate. However, considerable pressure is applied to the inside of the battery during this time, which may damage the electrodes.
Inside the battery container, a cylindrical metal inner can with a horizontal annular portion on the inner side of the upper end is placed, and the electrodes are housed in this interior to prevent the electrodes from collapsing due to sealing pressure. .

Due to such circumstances, in order to store the electrodes in the inner city,
Current collection on the anode side is carried out by bringing the current collector of the anode plate into contact with the inner peripheral surface of the inner can side wall, and by bringing the inner part into contact with the battery container. Contact with the container is made by forming the battery container into a tapered shape with a slightly larger diameter on the opening side in order to facilitate insertion of the inner wall into the battery container. As shown in FIG. 3, this was done only between the end of the inner wall 9 on the opening side and the bottom of the battery container 11.

However, because Uchigai is formed by drawing and used as is, there are variations in height, so contact with the battery container can only be made at the highest point, resulting in a so-called point contact state. This has the disadvantage that the internal resistance of the battery increases.

In order to solve this problem, it has been proposed to bulge out a part of the side surface of the inner wall and bring this part into contact with the inner surface of the battery container. However, the current collection effect is not significantly improved, and the above-mentioned drawbacks have not been completely eliminated.

This invention was made in view of such circumstances,
A metal ring with an inverted cross-section is placed on the upper edge of the inner city, and the outer circumferential surface of the ring is brought into contact with the inner surface of the battery container to increase the contact area, improve the current collection effect, and improve internal resistance. This makes it possible to obtain a sealed battery with a small size.

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a partial sectional view of a sealed spiral organic electrolyte battery showing one embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a metal ring used in the present invention.

In the drawing, 1 is the cathode material length 6-1 width 8 mm
, a cathode plate formed by pressing a current collector 3 made of a welded wire mesh onto one side of a lithium plate 2 having a thickness of 0.2rtrrrr;
is an anode plate having a length of 75 mm, a width of 8 mm, and a thickness of 0.5 mm, which is formed by holding an anode mixture 5 on a current collector 6 made of a welded wire mesh. 7, overlapped with the cathode plate 1, wound spirally around the cathode current collecting rod 8 as a core, and housed in an inner case 9 made of stainless steel.

At the inner end of the cathode plate 1, a current collector 3 is spot welded to a stainless steel cathode current collector rod 8, and at the outer end of the anode plate 4, a current collector 6 protrudes from the anode mixture 5. It is in contact with the inner surface of the side wall of Uchigai 9.

The inner wall 9 has a cylindrical shape with an annular horizontal portion 9a provided inside the upper end, and a stainless steel ring 10 having an inverted cross section is placed on the upper periphery. The outer peripheral surface is in contact with the inner surface of the battery container 11 as an anode can.

The battery container 11, the cathode plate 1, and the cathode current collector rod 8 are insulated by a resin insulating plate 12, and the cathode plate 1 and the inner wall 9 are insulated by a resin insulating ring 13. ing.

The enlarged head of the cathode current collector rod 8 protrudes upward from the center of the inner street 9, and a cathode terminal plate 14 made of a nickel-stainless steel clad plate is spot welded to the upper end protrusion. The peripheral portion of the plate 14 is folded back and a polypropylene acid annular backing 15 is fitted therein.

When the opening of the battery container 11 is tightened inward, the inner surface of the battery container 11 comes into contact with the outer circumferential surface of the ring 10 and is pressed against the annular backing 15, thereby making the inside of the battery a sealed structure.

Note that this battery uses an electrolytic solution prepared by dissolving lithium perchlorate at a ratio of 1.0 mol/l in a mixed solvent of propylene carbonate and 1,2-dimethoxyethane in a volume ratio of 1:1.

was injected, and the anode mixture was 1 part manganese dioxide (
(parts by weight, hereinafter the same), a part for phosphorous graphite, and 1 part of polytetrafluoroethylene.For the welded wire mesh as the current collectors 3 and 6, 60% stainless steel wire with a wire diameter of o, im is used. Plain weave on the mesh mesh 1 in vacuum
A welded stainless steel mesh fabricated by heating to 000'C, crimping and welding the intersection points of stainless steel wires is used.

Then, the horizontal part of the ring 10 is pressed by the lower surface of the annular backing 15 due to the sealing, and comes into close contact with the upper surface of the inner wall 9, and the outer peripheral surface of the ring 10 comes into close contact with the inner surface of the battery container 11. As a result, The contact between the inner wall 9 and the battery container 11 is made over a wider area through the ring 10 than in the conventional case, thereby increasing the current collection effect and reducing the internal resistance of the battery.

Further, the horizontal portion of the ring 10 strengthens the horizontal portion 9a of the inner wall 9, thereby increasing its ability to withstand sealing pressure.

When this ring 10 is used, the inner street 9 does not necessarily need to have a horizontal portion 9a, and may be simply cylindrical.

When the inner wall 9 is made into a simple cylindrical shape, the insertion of the electrode into the inner wall is limited to one direction from the open end side in the case with the horizontal portion 9a, but from either side. This makes it easier to assemble the battery.

Table 1 below shows the internal resistance and contact failure rate of Battery A of the present invention having the above configuration and Battery B having the same configuration as Battery A except that the metal ring 10 was not used.

In addition, 10 volumes each of batteries A and B were used in the test, and the internal resistance is shown as the average value, and the failure rate is determined when the internal resistance is 1
This is determined based on the judgment that a value of 00 or more is considered to be a poor contact.

As shown in Table 1, the battery A of the present invention is the conventional battery B.
The internal resistance was lower than that of the previous model, and there were no contact failures.

Although the embodiment has been described using the battery container 11 as an anode can, it is of course possible to use the battery container as a yin and yang can by reversing all the yin and yang in the battery system.

In addition, although the example describes the case of a spiral-type organic electrolyte battery, the present invention is not limited to that.
For example, it is applicable not only to other spiral type batteries such as alkaline batteries, but also to other types of sealed batteries.

As described in detail above, the present invention provides a sealed battery in which the electrode is housed in the inner part arranged inside the battery container and the opening of the battery container is tightened inward to seal the upper edge of the inner part. A metal ring with an inverted cross-section is placed on the battery case, and the outer peripheral surface of the ring is brought into contact with the inner surface of the battery container, thereby increasing the current collection effect and producing a sealed battery with low internal resistance. It is something.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a sealed spiral organic electrolyte battery showing an embodiment of the present invention, Fig. 2 is a perspective view showing an example of a metal ring used in the invention, and Fig. 3 is a conventional spiral organic electrolyte battery. FIG. 3 is a cross-sectional view showing a state of contact between the inner wall and the battery container in a type organic electrolyte battery. 9...Inner city, 10...Metal ring,
11...Battery container.

Claims (1)

[Scope of utility model registration request] In a sealed battery in which the electrode is housed in an inner casing 9 disposed inside the battery container 11 and the opening of the battery casing 11 is tightened inward to seal it, the upper edge of the inner casing 9 has an inverted cross-sectional shape. A sealed battery characterized in that a metal ring 10 having a shape is placed thereon, and the outer peripheral surface of the ring 10 is brought into contact with the inner surface of a battery container 11.