JPH067232U - Electric double layer capacitor device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts in an electric double-layer capacitor device that has a resin-made battery case molded by a mold. [Structure] In an electric double layer capacitor device in which a plurality of cells 3 are housed in a resin-made battery case 1 which is molded by a mold and whose inner surface is tapered, both end surfaces of a plurality of stacked cells The shape of the current collecting electrode 4 placed in contact with the inner surface of the battery case is such that it has a thickness that closes the gap between the end surface and the inner surface of the battery case 1-1, and a taper that is in close contact with the inner surface of the battery container on the side that contacts the inner surface of the battery case. The attached shape. Then, in order to apply a uniform pressing force to the end faces of the stacked cells, it is not necessary to prepare an independent component such as a wedge-shaped spacer which has been conventionally required, and the number of components is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric double layer capacitor device having a resin-made battery case molded by a mold.

[0002]

[Prior art]

 As is well known, the structure of the cell of the electric double layer capacitor is such that two polarizable electrodes made of activated carbon impregnated with an electrolytic solution face each other with a separator having an insulating property and an ion permeability interposed therebetween. The current collector is arranged behind the polarizable electrode, and the periphery of the portion excluding the current collector is sealed with a gasket to prevent leakage of the electrolytic solution. Then, a plurality of such cells were stacked as needed, and pressure was applied from the back of the current collector to reduce the internal resistance.

However, recently, an electric double layer capacitor device has been proposed in which a resin case is prepared as a battery case and a plurality of cells are put in this case (eg, Japanese Utility Model Publication No. 51-097733). Gazette). The gasket can be eliminated by stacking multiple cells in the battery case, so that the volume occupied by the gasket can be reduced. Conversely, if the size remains the same, the volume of the cell can be increased by the volume occupied by the gasket, and thus the capacity can be increased.

FIG. 2 is a diagram showing such a conventional electric double layer capacitor device. In FIG. 2, 1 is a battery case, 1-1 is an inner surface of the battery container, 2 is a wedge-shaped spacer, 3 is a cell, and 4 is a collecting electrode. The collector electrode 4 has a structure in which, for example, a copper plate is covered with a conductive sheet. The battery case 1 is a resin case and is molded by a mold. Therefore, in order to facilitate the removal of the mold during molding, the inner surface 1-1 of the battery case is tapered so as to open toward the opening.

FIG. 3 shows an example of a cell 3 of an electric double layer capacitor which is put in the battery case 1. Reference numeral 31 is a collector made of conductive rubber, 32 is a solid activated carbon pellet, a polarizable electrode impregnated with an electrolytic solution, and 33 is a separator made of porous plastic or the like. No gasket is provided. The pellet of the polarizable electrode 32 is bonded to the current collector 31 with a conductive adhesive such as a conductive paint. The cell 3 has a thin flat plate shape as a whole.

In a state in which a plurality of thin flat plate-shaped cells 3 are stacked and the current collecting electrodes 4 are brought into contact with both end surfaces of the cells 3 and placed in the battery case 1, a space between the current collecting electrode 4 and the battery case inner surface 1-1 is provided. Then, a wedge-shaped gap appears. In order to make the distribution of the electrolyte solution uniform in each cell 3 and to reduce the internal resistance, it is necessary to apply a substantially uniform pressing force from both sides of the current collecting electrode 4. Therefore, the wedge-shaped spacer 2 is pushed into the gap.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned conventional electric double-layer capacitor device, the wedge-shaped spacer 2 to be pushed into the gap between the collector electrode 4 and the battery case inner surface 1-1 must be prepared as an independent component. However, there was a problem that the number of parts increased. The present invention aims to solve such problems.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides an electric double layer capacitor device in which a plurality of cells are housed in a resin-made battery case that is molded by a mold and has a taper on the inner surface of the battery case. The shape of the current collecting electrodes arranged to abut the end faces on both sides of each cell is such that it has a thickness that closes the gap between the end face and the inner surface of the battery case and is on the side that contacts the inner surface of the battery container. It was decided to make it a tapered shape that closely contacts the inner surface.

[0009]

[Work]

 In an electric double-layer capacitor device in which a plurality of cells are housed in a resin-made battery case that is molded by a metal mold and the inner surface of the battery case is tapered, contact both ends of the stacked cells. The shape of the current collecting electrode is such that it has a thickness that closes the gap between the end surface and the inner surface of the battery case, and the side contacting the inner surface of the battery container is tapered so as to be in close contact with the inner surface of the battery case. Then, in order to apply a uniform pressing force to the end faces of the stacked cells, it is not necessary to prepare an independent part such as a wedge spacer, and the number of parts is reduced.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an electric double layer capacitor device of the present invention. The reference numerals correspond to those in FIG. In terms of configuration, the point different from the conventional example of FIG. 2 is that the shape of the collecting electrode 4 has a thickness that closes the gap between the end surface of the cell 3 and the inner surface 1-1 of the battery case, and The point is that the opposite side is tapered with the same inclination as the inner surface 1-1 of the battery case.

That is, in the present invention, the shape of the collector electrode 4 is such that the conventional collector electrode 4 and the wedge-shaped spacer 2 are integrated. As a result, it is possible to store the cells in the battery case 1 so that a pressing force is applied from both sides of the stacked cells 3 without preparing an independent component such as the wedge spacer 2.

The collector electrode 4 becomes thicker toward the upper side of the battery case 1, which is also convenient in view of the distribution of the current flowing in the collector electrode 4. Because the current flows toward the upper end of the current collecting electrode 4, the current distribution becomes wider as it goes up, but the current collecting electrode 4 also gets thicker as it goes up, and the current density becomes uniform. Because.

[0013]

[Effect of device]

 As described above, according to the electric double-layer capacitor device of the present invention, the electric double-layer capacitor is formed by a mold, and a plurality of cells are housed in a resin-made battery case whose inner surface is tapered. In the device, the shape of the collector electrode that is placed in contact with both end surfaces of the multiple stacked cells is set so that it has a thickness that closes the gap between the end surface and the inner surface of the battery case and is in contact with the inner surface of the battery container. Since the taper shape closely contacts the inner surface of the battery case, it is not necessary to prepare separate parts such as wedge spacers, and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an electric double layer capacitor device of the present invention.

FIG. 2 is a diagram showing a conventional electric double layer capacitor device.

FIG. 3 is a diagram showing a cell of an electric double layer capacitor.

[Explanation of symbols]

1 ... battery case, 1-1 ... battery container inner surface, 2 ... wedge type spacer,
3 ... Cell, 31 ... Current collector, 32 ... Polarizable electrode, 33 ... Separator, 4 ... Current collecting electrode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sekine Yasuhiro Fujisawa City No. 8 Shelf in Isawa Motor Co., Ltd. Fujisawa Plant (72) Inventor Tatsuji Kitamura No. 8 Fujisawa City Shelf Isuzu Motors Co., Ltd. Fujisawa Plant (72) Inventor Toshifumi Fujisawa City, No. 8 Shelf, Isawa Motor Co., Ltd. Fujisawa Plant (72) Inventor, Katsuhiko Kushibiki, Fujisawa, No. 8 Shelf, Isuzu Motors Co., Ltd., Fujisawa Plant

Claims (1)

[Scope of utility model registration request] 1. An electric double-layer capacitor device in which a plurality of cells are housed in a resin-made battery case which is molded by a metal mold and whose inner surface is tapered. The shape of the current collecting electrode to be placed in contact is such that it has a thickness that closes the gap between the end surface and the inner surface of the battery case, and a taper that is in close contact with the inner surface of the battery container is provided on the side in contact with the inner surface of the battery case. An electric double layer capacitor device having a curved shape.