JPH0644132U - Electric double layer capacitor - Google Patents

Abstract

(57) [Summary] [Purpose] A plurality of intermediate current collectors having solid polarizable electrodes 32 attached to the front and back are arranged side by side, and they are sandwiched between terminal collectors 41 having polarizable electrodes 32 attached to one side. When the electric double layer capacitor housed in the resin case 1 is used upside down, the terminal 41-extended in the terminal current collector 41-
Prevent short circuit between the two due to the electrolyte oozing out from the polarizable electrode. [Structure] Terminal 41-2 extended from terminal current collector 41
The surface of the portion other than the tip electrical contact portion is subjected to insulation treatment to form the surface insulation treatment portion 6. When the electric double layer capacitor is used upside down, even if water is mixed in or the electrolytic solution seeps out from the polarizable electrode, the terminal 4 of the terminal current collector
No short circuit will occur between 1-2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention uses an electric double layer structure in which pellets obtained by sintering activated carbon powder are used as the polarizable electrodes, a conductive rubber sheet is used as the current collector of each cell, and the entire laminated cells are put in an insulating resin case. It is about capacitors.

[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 in which a plurality of cells are vertically arranged in a resin case has been proposed (eg, Japanese Patent Laid-Open No. 53-107629). Since the resin case has insulating properties, the gasket can be eliminated and the volume occupied by the gasket can be made smaller. On the contrary, if the size remains the same, the volume of the cell can be increased by the volume occupied by the gasket, so that the capacity can be increased.

FIG. 3 is a view showing such a conventional electric double layer capacitor device, and FIG. 4 is a cross-sectional view taken along the line XX in FIG. In these figures, 1 is a resin case, 2 is a saddle part, 32 is a polarizable electrode, 41 is a terminal current collector, and 41-2 is a terminal. The terminal current collector 41 forms a part of the terminal unit cell described in FIG. 5, and a plurality of intermediate unit cells (illustrated in FIG. 5) are arranged between the terminal unit cells at both ends. A saddle part 2 is placed on the bottom of the case 1, and a terminal unit cell and an intermediate unit cell are vertically arranged on the saddle part 2. Then, only the terminal 41-2 penetrates the case 1 and projects upward.

FIG. 5 is a diagram showing configurations of the intermediate unit cell 3 and the terminal unit cell 4. 31 is an intermediate current collector made of conductive rubber, 32 is a solid pellet made by sintering activated carbon powder, and is a polarizable electrode impregnated with an electrolytic solution, and 33 is a separator made of porous plastic or the like. Is. The terminal current collector 41 has a structure in which, for example, a copper plate is covered with a conductive rubber sheet. Since Case 1 is made of insulating resin and has achieved insulation from the outside, no gasket is provided in addition to this.

The reason why the conductive rubber is used as the material of the intermediate collector 31 is that it is light in weight and that it is not corroded even when sulfuric acid is used as the electrolytic solution. If a metal plate is used, it is heavy and corroded by sulfuric acid. The terminal current collector 41 is covered with a conductive rubber sheet to prevent corrosion by sulfuric acid.

As shown in the lower part of FIG. 5, the terminal unit cell 4 refers to a component portion from the terminal current collector 41 to the adjacent intermediate current collector 31, and the intermediate unit cell 3 is a certain intermediate current collector. It refers to the components from the body 31 to the adjacent intermediate current collector 31. Both the intermediate unit cell 3 and the terminal unit cell 4 have a thin flat plate shape as a whole.

FIG. 6 is a plan view of the terminal current collector 41 and the intermediate current collector 31. 41-2 is a terminal extending from the terminal current collector 41. The pellet of the polarizable electrode 32 is bonded to the intermediate current collector 31 or the terminal current collector 41 with a conductive adhesive such as a conductive paint. As will be understood by referring to FIG. 5, the polarizable electrode 32 is adhered to both sides of the intermediate current collector 31 and one side of the terminal current collector 41.

When the polarizable electrode 32 is adhered to the intermediate current collector 31, the front and back polarizable electrodes are surrounded by an edge portion 3 1-1 so as not to be short-circuited by accidentally mixed water droplets. Are glued in a flat arrangement so that the Since the polarizable electrode 32 adhered to the terminal current collector 41 is adhered so as to face the polarizable electrode 32 adhered to the intermediate current collector 31, the size of the terminal current collector 41 is set to the intermediate current collector 31. If the size is set to be the same, the edge portion 41-1 also remains on the terminal current collector 41.

In FIG. 4, the saddle part 2 is arranged at the bottom of the case 1, and the reason is as follows. The mixed water or the electrolyte leached from the polarizable electrode may collect on the bottom of the case 1. However, the edge of the intermediate current collector 31 or the edge of the terminal current collector 41 may contact the bottom of the case 1. If so, the unit cells will be short-circuited via the accumulated water or electrolytic solution. In order to avoid this, a saddle portion 2 in which plates are projected in a row is arranged at the bottom of the case 1 and is placed so that the above-mentioned edge portion is in contact therewith.

[0011]

[Problems to be solved by the device]

 (Problem) However, the above-mentioned conventional electric double layer capacitor device has a problem that when the case 1 is used upside down, the two terminals 41-2 may be short-circuited. It was

(Explanation of Problems) FIG. 7 shows a cross-sectional view of a conventional electric double layer capacitor, which is turned upside down. Reference numerals correspond to those in FIG. 4, and reference numeral 5 denotes an electrolytic solution or the like. The electrolytic solution 5 contains water mixed for some reason and the electrolytic solution exuding from the polarizable electrode 32. When the case 1 is used in reverse, when water is mixed in or the electrolytic solution seeps out from the polarizable electrode 32, they are accumulated on the side where the terminal 41-2 is present, as shown in the figure. Then, the two terminals 41-2 are short-circuited via the electrolytic solution 5 or the like. The present invention aims to solve such problems.

[0013]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, a conductive rubber intermediate current collector having solid polarizable electrodes on both sides, and a terminal current collector having solid polarizable electrodes on one side, The separator is interposed when the polarizable electrodes are arranged opposite to each other, and has an insulating and ion-permeable separator, and the intermediate current collector and the terminal current collector are arranged side by side. In the electric double layer capacitor, the surface of a portion of the terminal extending from the terminal current collector other than the tip electric contact portion is insulated.

[0014]

[Work]

 By insulating the surface of the terminal extending from the terminal current collector other than the tip electrical contact part, water may be mixed in or separated when the electric double layer capacitor is used upside down. Even if the electrolyte oozes out from the polar electrode, the terminals of the terminal current collector will not be short-circuited.

[0015]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is a diagram showing a terminal current collector used in the present invention. Reference numerals correspond to those in FIG. 6, and 6 is a surface insulation processing portion. In the present invention, the surface insulation treatment portion 6 is formed by subjecting the surface of the terminal 41-2 extending to the terminal current collector 41 to a portion other than the tip electrical contact portion to insulate the surface. As an example of the insulation treatment, there is a treatment of applying an insulating paint having excellent sulfuric acid resistance (epoxy type, butyl rubber type, acrylic rubber type, etc.).

FIG. 1 is a vertical sectional view of an electric double layer capacitor of the present invention. Reference numerals correspond to those in FIGS. 4 and 2. As the terminal current collector 41, the one shown in FIG. 2 is used. Therefore, the surface insulation treatment portion 6 continues from the base portion of the terminal 41-2 to the portion outside the case 1.

Therefore, even if this electric double layer capacitor is used upside down, even if water is mixed in or the electrolytic solution seeps out from the polarizable electrode 32, the two terminals 41-2 are connected to each other. However, since the portion soaked in the electrolytic solution is the surface insulating treatment portion 6, a short circuit does not occur.

[0018]

[Effect of device]

 As described above, according to the electric double layer capacitor of the present invention, since the surface of the portion other than the tip electrical contact portion of the terminal extending from the terminal current collector is insulated, the electric double layer capacitor is When used in reverse, even if water is mixed in or the electrolyte oozes out from the polarizable electrode, the terminals of the terminal current collector will not be short-circuited.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric double layer capacitor of the present invention.

FIG. 2 is a diagram showing a terminal current collector used in the present invention.

FIG. 3 is a schematic view of an electric double layer capacitor.

FIG. 4 is a vertical sectional view of a conventional electric double layer capacitor.

FIG. 5 is a diagram showing a configuration of an intermediate unit cell and an end unit cell.

FIG. 6 is a plan view of a conventional terminal current collector and intermediate current collector.

FIG. 7 is a cross-sectional view of a conventional electric double layer capacitor when turned upside down.

[Explanation of symbols]

1 ... Case, 2 ... Saddle part, 3 ... Intermediate unit cell, 31 ...
Intermediate current collector, 31-1 ... Edge, 32 ... Polarizable electrode, 33
... Separator, 4 ... Termination unit cell, 41 ... Termination current collector, 41-1 ... Edge, 41-2 ... Terminal, 6 ... Surface insulation treatment section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshifumi Fujisawa 8 Soil Shelf, Isawa Motor Co., Ltd. Fujisawa Factory (72) Inventor Masatoshi Watanabe Fujisawa 8 Shelf, Isuzu Motors Co., Ltd. Fujisawa Plant (72) Inventor Fumio Nakanishi 8th Fujisawa City Shelf 8 Isuzu Motors Co., Ltd. Fujisawa Plant (72) Inventor Ryuo Higuchi 8th Fujisawa City Shelf Isuzu Motors Co., Ltd. Fujisawa Factory

Claims (1)

[Scope of utility model registration request] 1. A conductive rubber intermediate current collector having solid polarizable electrodes on both sides, a terminal current collector having solid polarizable electrodes on one side, and the polarizable electrodes facing each other. An electric double layer capacitor, which is interposed when being arranged, has an insulating and ion-permeable separator, and in which the intermediate current collector and the terminal current collector are arranged side by side, the terminal current collector. An electric double layer capacitor characterized in that the surface of a portion of the terminal extending from the body other than the tip electric contact portion is insulated.