JPH0338829Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an electric double layer capacitor in which a coin-shaped cell, which is a capacitance element, is inserted into an exterior metal case. This invention relates to means for preventing rotation of an electrode unit disposed within an opening of the electrode unit.

[Conventional example]

Electric double layer capacitors are mainly used as memory backup capacitors,
Since the rated voltage of a single cell is low, multiple cells are stacked to obtain a high voltage. That is, a predetermined number of cells are inserted into a cylindrical exterior metal case with a bottom, and inside the case opening,
After placing an electrode unit with an electrically insulating plate interposed between a pair of electrode plates, both of which have lead terminals, and bringing the uppermost cell into electrical contact with one of the electrode plates, the case opening is turned inward. By caulking and mechanically and electrically joining the edge to the other electrode plate, a desired voltage can be obtained through the lead terminal.

[Problem that the invention attempts to solve]

When caulking the opening of the exterior metal case, increasing the caulking will improve the contact between the cells, between the cells and the case, and between the cells and the electrode plates, which will reduce the series resistance of the electric double layer capacitor itself. However, if the caulking pressure is too strong, there is a risk that the electrolyte sealed in the cell will leak and its properties will deteriorate.

Therefore, the case opening is caulked with enough force to prevent electrolyte leakage, but according to this method, when external force is applied, the electrode plate rotates inside the case opening, causing damage to the case itself or the case itself. Another drawback is that the relationship with the polarity display mark displayed on the sleeve is inconsistent.

This invention aims to solve the above-mentioned conventional drawbacks.

[Means for solving problems]

In order to achieve the above object, in this invention, a blind notch recess is formed on the inner wall of the opening of the exterior metal case, and the electrode unit disposed inside the case opening is engaged with the notch recess. A protrusion is provided to

〔Example〕

Hereinafter, one embodiment of this invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, this electric double layer capacitor includes a cylindrical exterior metal case 1 with a bottom. A plurality of coin-shaped cells 2, three in this embodiment, are inserted into the exterior metal case 1. A protrusion 1a is formed at the bottom of the exterior metal case 1 for making good electrical contact with the lowest cell 2. Further, a sleeve 3 made of a synthetic resin film is placed around the three stacked cells 2 in order to electrically insulate them from the exterior metal case 1.

An electrode unit 4 for extracting voltage from the stack of cells 2 is arranged in the opening of the exterior metal case 1. This electrode unit 4 has a first electrode plate 5 having a lead terminal 5a long enough to protrude from the case opening, and a second electrode plate 6 having a lead terminal 6a long enough to similarly protrude from the case opening. It consists of an electrically insulating plate 7 interposed in between,
In this example, the lower first electrode plate 5 is arranged so as to be in contact with the electrode surface of the uppermost cell 2. According to this embodiment, the upper second electrode plate 6 has two grooves 6 cut in its diametrical direction from opposite edges.
b, 6c are formed, and the upper surface of the electrically insulating plate 7 is provided with protrusions 7a, 7b that engage with the grooves 6b, 6c, thereby preventing relative rotational deviation between the two. Can be combined as follows. Note that the first electrode plate 5 is formed to have a smaller diameter than the electrical insulating plate 7 so as not to come into contact with the exterior metal case 1, and its lead terminal 5a is connected to the electrical insulating plate 7.
It is pulled out to the outside through a small hole 7c formed in the raised portion 7a.

At least one, in this embodiment, two blind cutout recesses 8, 8 are formed at an interval of 180° on the inner wall of the opening of the exterior metal case 1.
On the other hand, for example, the electrically insulating plate 7 of the electrode unit 4 is provided with a pair of projections 9, 9 that engage with the notched recesses 8, 8. That is, the electrode unit 4 is placed in the opening of the exterior metal case 1 with its protrusions 9, 9 engaged with the cutout recesses 8, 8, and then the opening is caulked inward by a caulking machine (not shown). , its opening edge 1b
is mechanically and electrically connected to the second electrode plate 6. As a result, one electrode of the laminate of the cell 2 is drawn out through the exterior metal case 1, the second electrode plate 6 and its lead terminal 6a, and the other electrode is drawn out through the first electrode plate 5 and its lead terminal. 5
It is pulled out from a.

Note that, unlike the above embodiment, the second electrode plate 6
A protrusion that engages with the cutout recesses 8, 8 may be provided.

〔effect〕

As is clear from the above description of the embodiment, according to this invention, a blind notch recess 8 is formed in the inner wall of the opening of the exterior metal case 1, and the notch recess 8 is formed on the electrode unit 4 side. By providing the engaging protrusions 9, even if the caulking force at the case opening is loosened to the extent that electrolyte leakage of the cell 2 does not occur, the electrode plates 5 and 6 may be rotated due to, for example, impact force during product transportation. Therefore, an electric double layer capacitor that does not cause any misalignment with the polarity display mark can be obtained. Further, since the cutout recess 8 is blind, there is no risk of dirt, moisture, etc. entering the case.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of an electric double layer capacitor constructed according to this invention;
FIG. 2 is a sectional view of the same embodiment in an assembled state. In the figure, 1 is an exterior metal case, 2 is a cell, 3 is a sleeve, 4 is an electrode unit, 5 is a first electrode plate,
6 is a second electrode plate, 5a, 6a are lead terminals, 7
8 is an electrically insulating plate, 8 is a notch, and 9 is a protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A predetermined number of coin-shaped cells, which are capacitive elements, are inserted into a bottomed cylindrical exterior metal case, and a lead protrudes outward from the opening of the exterior metal case. An electrode unit in which first and second electrode plates each having a terminal are stacked with an electrically insulating plate in between is inserted into the opening of the exterior metal case so that the first electrode plate is in electrical contact with the cell. an electric double layer capacitor in which the opening of the exterior metal case is crimped inward and the edge thereof is mechanically and electrically connected to the second electrode plate; An electric double layer capacitor characterized in that a blind cutout recess is formed in the inner wall of the capacitor, and a protrusion that engages with the cutout recess is provided on the electrode unit side. (2) In claim (1) for utility model registration, the second electrode plate and the electrically insulating plate are connected so that there is no relative rotational shift between them, and the electrically insulating plate has the protrusion. An electric double layer capacitor characterized by being provided with. (3) The electric double layer capacitor according to claim (1), characterized in that the projection is provided on the second electrode plate. (4) In claim (1) for utility model registration, the lead terminal of the first electrode plate includes a small hole formed in the electrically insulating plate and a groove portion formed in the second electrode plate. An electric double layer capacitor, characterized in that the capacitor is drawn out to the outside of the exterior metal case through the capacitor. (5) Claim (2) of the utility model registration is characterized in that a means for preventing rotational deviation is formed between the electrically insulating plate and the second electrode plate and is formed by interlocking concave and convex portions. electric double layer capacitor.