JPH0338828Y2 - - 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 each cell is low, multiple cells must be 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 notch groove is formed in the opening of the exterior metal case, and a protrusion that engages with the notch groove is provided on the side of the electrode unit disposed inside the case opening. That's what I do.

〔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.

The opening of the exterior metal case 1 has at least one
In this embodiment, two cutout grooves 8, 8 are formed with an interval of 180°. On the contrary,
For example, the electrically insulating plate 7 of the electrode unit 4 is provided with a pair of protrusions 9, 9 that engage with the notched grooves 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 notch grooves 8, 8, and then the opening is caulked inward by a caulking machine (not shown). , the 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. 5a to the outside.

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

〔effect〕

As is clear from the description of the embodiments described above, according to this invention, a notch groove 8 is formed in the opening of the exterior metal case 1, and a protrusion that engages with the notch groove 8 is formed on the electrode unit 4 side. 9 prevents the electrode plates 5 and 6 from rotating due to, for example, impact force during product transportation, even if the caulking force at the case opening is loosened to the extent that electrolyte leakage of the cell 2 does not occur. , it is possible to obtain an electric double layer capacitor that does not cause misalignment with the polarity display mark.

[Brief explanation of drawings]

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 electric insulating plate, 8 is a cutout groove, 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 cutout groove is formed in the part, and a protrusion that engages with the cutout groove 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) for utility model registration, 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 electrical insulation 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 stage and the second electrode plate, which is formed by interlocking concave and convex portions. Electric double layer capacitor.