JPS5919331Y2 - sealed storage battery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a sealed storage battery equipped with an explosion-proof valve device.

Explosion-proof valve devices for sealed storage batteries prevent the battery from exploding by operating the valve when the gas pressure inside the battery rises abnormally, such as during overcharging, to release the gas to the outside.
Various structures have been proposed in the past, but in all of them, a charging current is applied to the battery even when the valve is in operation.

However, since the charging current during overcharging is used for the decomposition reaction of water in the electrolyte, the electrolyte decreases and battery performance deteriorates.

The present invention has been developed to solve these problems, and by preventing charging current from being applied to the battery at the same time as the valve operates, the deterioration in battery performance due to the decrease in electrolyte can be avoided. It suppresses the lower part.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 designates an exterior can that also serves as a cathode terminal in which a power generating element (not shown) is housed, and 2 an insulating backing.

Reference numeral 3 denotes a cover plate having a valve hole 3', and an anode lead-out piece 4 is spot-welded to the lower surface of the cover plate.

Reference numeral 5 denotes an anode terminal plate provided with a gas vent hole 5', which is separated from the lid plate 3 by an insulating backing 2 and forms a valve chamber 6.

Inside this valve chamber 6 is a valve body 7 made of, for example, synthetic resin or rubber, which always closes the valve hole 3' in an airtight and liquid-tight manner.
A valve body holding plate 8 made of a metal plate and a portion 8' of which is normally in contact with the lid plate 3, and this holding plate 8 and an anode terminal plate 5.
A conductive spring body 9 is inserted between the two.

In such a configuration, since a part 8' of the presser plate 8 is always in contact with the cover plate 3 due to the pressure of the spring body 9,
The cover plate 3 and the anode terminal plate 5 are electrically connected via the holding plate 8 and the spring body 9, so that a charging current is applied between the anode terminal plate 5 and the cathode terminal-cum-exterior case 1 during charging. The battery will be charged.

Now, when charging progresses and the gas pressure inside the battery rises to a predetermined value or higher, reaching an overcharged state, the valve body 7 is lifted and the internally generated gas is discharged through the gas vent hole 5', preventing the battery from exploding. Prevented.

At this time, that is, when the valve body 7 is lifted, the presser plate 8
Since the cover plate 3 is separated from the cover plate 3, the electrical connection between the cover plate 3 and the anode terminal plate 5 is cut off, and no charging current is applied to the battery.

Note that when the gas pressure drops due to the valve operation, the holding plate 8 and the cover plate 3 come into contact with each other again, and the battery becomes ready for charging.

When charging a storage battery, as mentioned at the beginning, the charging current during overcharging is used for the decomposition reaction of water, so unlike conventional batteries, charging current is continuously applied even when the valve is in operation. If the battery is used, the amount of electrolyte will be significantly reduced, shortening the life of the battery.

On the other hand, according to the battery of the present invention, the electrical connection between the cover plate and the terminal board is cut off at the same time as the valve operates, so that no charging current is applied to the battery while the gas pressure inside the battery drops to a predetermined value. Therefore, during overcharging, a state occurs in which a charging current is not applied to the battery intermittently, and compared to conventional batteries where a charging current is continuously applied, the electrolysis time required for electrolysis of water in the electrolyte solution is reduced. Since the time is shortened, the amount of electrolyte decreases less, which has the effect of suppressing deterioration of battery performance.

[Brief explanation of the drawing]

The drawings are all related to the present invention; FIG. 1 is a partially cutaway cross-sectional view of the battery of the present invention, and FIG. 2 is an enlarged cross-sectional view of the same essential parts. 1...Exterior can that also serves as cathode terminal, 2...Insulating packing, 3...Lid plate, 5...Anode terminal plate, 6...・Valve chamber, 7... Valve body,
8... Valve body holding plate, 9... Spring body.

Claims (1)

[Scope of utility model registration request] In a valve chamber formed by a lid plate and a terminal plate separated by an insulating backing, there are provided a valve body that always closes a valve hole provided in the lid plate, and a conductive valve body that is partially in contact with the lid plate at all times. A valve body holding plate and a conductive spring body located between the holding plate and the terminal plate are inserted, and when the internal pressure of the battery increases, the holding plate is separated from the cover plate, thereby suppressing internally generated gas. A sealed storage battery that cuts off the electrical connection between the lid plate and the terminal plate while the battery is being discharged.