JPH0218920Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of a sealed alkaline storage battery, and is particularly aimed at improving earthquake resistance and impact resistance.

Conventionally, this type of battery is constructed such that the metal container has negative polarity and the terminal cover has positive polarity. That is, among the battery elements housed in the metal container, the negative electrode plate is connected to the bottom of the metal container via the lead metal plate, and the positive electrode plate is connected to the terminal cover via the lead metal plate. In addition, a battery element is a spirally wound stack of positive electrode plates, separators, and negative electrode plates.
In order to facilitate storage in a metal container, care is taken to have an outer diameter that is sufficiently smaller than the inner diameter of the metal container. Therefore, a considerable amount of space is created between the inner wall of the metal container and the battery element. That is, the battery element in the metal container is supported only at two connections: the terminal cover and the bottom of the metal container. Because of this structure, in applications where the battery is used as a drive source for a motor, for example in portable equipment such as power tools and electric cleaners, vibrations from the motor are transmitted to the battery, causing the battery element to be damaged inside the metal container. A phenomenon occurs in which the particles resonate between the air gaps. At this time, repeated stress is applied to the connections between the positive and negative electrode plates and the lead metal plate, or the connections between the lead metal plate and the metal container and terminal cover, and the connections eventually peel off due to fatigue fracture, etc., and the battery It had the disadvantage that it no longer functions as such. Furthermore, the same drawback occurs when a shock is applied to the battery, such as by dropping it on the floor.

The present invention eliminates the above-mentioned drawbacks and provides a sealed alkaline storage battery with excellent earthquake resistance and impact resistance.

The key point of the present invention is that, at the opening of the metal container housing the battery element inside, the terminal cover is pressed between the terminal cover and the battery element by the bent part covering the outer edge of the battery element and the terminal cover. an insulator integrally having an annular convex portion and a bottom of the metal container,
An insulator having a bent part that covers the lower outer edge of the battery element is interposed between the bottom surface of the metal container and the battery element, and a through hole is formed in the center of each insulator, and the positive and negative electrode plates are inserted into the hole. The lead metal plate of the positive electrode plate is inserted through the positive electrode plate, and the convex portion is arranged so as to surround the lead metal plate of the positive electrode plate.

The detailed contents will be explained based on one embodiment of the present invention.

FIG. 1 is a sectional view of a main part of a sealed alkaline storage battery according to the present invention, and FIG. 2 is a plan view of an insulator in FIG. 1.

The battery houses a battery element 2 inside a cylindrical metal container 1, and a terminal cover consisting of a metal lid 3 having an exhaust valve and a rubber packing 4 is caulked at the opening of the metal container 1 to maintain airtightness. There is. The positive electrode plate of the battery element 2 is connected to the metal lid 3 by the lead metal plate 5.
The negative electrode plate is similarly connected to the bottom of the metal container 1 by a lead metal plate 6. Therefore, the metal lid 3 has positive polarity and the metal container 1 has negative polarity. The insulator 7 in the present invention is interposed between the metal lid 3 and the battery element 2, covers the outer edge of the battery element 2, and fills a part of the gap 11 created between the metal container 1 and the battery element 2. It has a refractive portion 8 that fills the area. Further, the insulator 7' is interposed at the bottom of the metal container 1 between the bottom surface of the metal container 1 and the battery element 2, covers the outer edge of the battery element 2, and has a bent portion 8 that fills a part of the gap 11. ′ as well.

By filling a portion of the void 11 with the insulators 7 and 7', it is possible to prevent the battery element 2 from swinging laterally due to vibration or impact. However, this alone is not sufficient to prevent vertical vibration of the battery element 2. Therefore, the insulator 7 also has an annular convex portion 9 that is pressed by the metal lid 3 when the metal lid 3 is caulked to the metal container 1 via the packing 4 disposed on the periphery thereof. The convex portion 9
It is pressed by the caulking, and the battery element 2 is also pressed and fixed. Therefore, the insulator 7,
The effects of the bent portions 8, 8' of 7' and the convex portion 9 are synergistic, and the battery element 2 is unable to vibrate horizontally or vertically. Further, the convex portion 9 is connected to the lead metal plate 5 of the positive electrode plate.
It is necessary to arrange it so as to surround it. This is because not only is the pressing force applied by the metal lid 3 applied evenly to the entire upper surface of the battery element 2, but even if the connection between the metal lid 3 and the lead metal plate 5 breaks, the lead metal plate This is because it is possible to prevent the battery from being short-circuited due to contact of the battery 5 with the metal container 1. In addition, a through hole 10 is provided at the center of the insulators 7 and 7'.
10' is formed. The through holes 10 and 10' are used not only for introducing the lead metal plates 5 and 6 through these holes, but also for the winding center of the battery element 2 when connecting the lead metal plate 6 of the negative electrode plate to the bottom of the metal container 1. The through hole 10 is also used to introduce a welding rod through the gap, and the through hole 10 also serves to guide gas generated in the battery element 2 to the exhaust valve. Although the insulators 7 and 7' are made of polypropylene in this embodiment, they may be made of any material having electrical insulation and alkali resistance, such as vinyl chloride, ABS resin, polytetrafluoroethylene, etc.

Since the present invention has the above-mentioned configuration, even if vibrations or shocks are applied to the battery as described above, the movement of the battery elements is prevented, and the lead metal plate does not peel off at the connection part. It is effective and has extremely great practical value.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention;
FIG. 2 is a plan view of the insulator in FIG. 1. 1 is a metal container, 2 is a battery element, 3 is a metal lid, 4
is the packing, 5 is the metal plate for the lead of the positive electrode plate, 6
is a metal plate for the lead of the negative electrode plate, 7 and 7' are insulators,
8, 8' are the bent parts of the insulators 7, 7', and 9 is the insulator 7.
10 and 10' are through holes in the insulators 7 and 7',
11 is a void.

Claims (1)

[Scope of utility model registration request] At the opening of the metal container housing the battery element therein, a bent part covering the upper outer edge of the battery element is integrally formed between the terminal cover and the battery element, and an annular convex part pressed by the terminal cover. An insulator and an insulator having a bent part covering the lower outer edge of the battery element are interposed between the bottom of the metal container and the battery element at the bottom of the metal container, and a through hole is formed in the center of each insulator. A sealed alkaline storage battery, characterized in that a lead metal plate of a positive and negative electrode plate is inserted into the hole, and the convex portion is arranged so as to surround the lead metal plate of the positive electrode plate.