JPH04320018A - Sheathing of electric double layer capacitor - Google Patents

Abstract

PURPOSE:To provide a sheathing metal wherein a capacitor body is accommodated and fixed in a sheathing casing with uniform pressurization and is kept at a pressurized state. CONSTITUTION:An electric double layer capacitor comprises cells 1 laminated in upper and lower two stages, a capacitor body 3 including electrode plates 2 laminated on the upper and lower surfaces thereof, and a pair of divided casings 4 each for accommodating the capacitor body 3 at a pressurized state. The divided casings 4 are extended in the direction of lamination of the cell 1 in the capacitor body 3. The divided casings 4 are joined by setting an internal thickness D of each of them to a degree for pressurization force to be exerted on the capacitor body 3, and welding them along a junction part 4b of the casings 4 through welding applying pressurization force thereon in the state where the body 3 is accommodated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for packaging an electric double layer capacitor, which allows a capacitor body to be housed and fixed in an exterior case by applying uniform pressure.

0002

[Prior art] The method for manufacturing electric double layer capacitors is as follows:
The inside of the gasket is filled with polarizable electrodes, which are stacked one above the other with a separator in between, and conductive films are placed on the top and bottom surfaces of each gasket to form cells, and these cells are stacked in series in multiple stages. , and the electrode plates stacked on the upper and lower surfaces are fastened together using multiple bolts to pressurize each cell in the stacking direction and seal the inside, or by clamping the electrode plates with other fixing frames and tightening the bolts. A common method is to pressurize and seal the inside.

In addition, instead of this method, the capacitor main body, in which the cell stack and the electrode plate are assembled, is housed in a bottomed exterior metal case, and the openings are caulked so that each cell can be stacked in the stacking direction. For example, as shown in Japanese Unexamined Patent Application Publication No. 2-174212 (International Classification: E01G 9/00), the main body is housed in an exterior resin case with pressure applied to it. There is a method of removing the pressurizing force after that.

0004

[Problems to be Solved by the Invention] However, in the method of fixing electrode plates or frames by tightening them together, the tightening is performed at multiple points and only the periphery, so the pressure is uneven and the outer shape of the cell is Easy to deform,
This has disadvantages that cause poor sealing, is cumbersome to assemble, requires space for mounting bolts, has poor volumetric efficiency, and leaves the exterior exposed.

[0005] Also, with the exterior method of caulking the metal case, pressure can be maintained with a small capacitor;
If it becomes large, it cannot be held sufficiently.

[0006] Furthermore, in the method of pressurizing the cell and housing it in the case, the pressure is released and the compression recovers once the cell is housed, which causes the spaces between each cell to become loose, resulting in poor airtightness.

[0007] The present invention solves the above-mentioned drawbacks, and provides an electric double layer capacitor which is housed in a case so that it is fixed inside an exterior case with a uniform pressure applied to the capacitor body. The purpose of this invention is to provide an exterior packaging method.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a capacitor body in which capacitor cells are stacked in multiple stages and electrode plates are stacked on the upper and lower surfaces of the capacitor body, and the capacitor body is placed in a pressurized state. A method for packaging an electric double layer capacitor comprising a pair of split cases housed in a capacitor body, the capacitor body is housed in one split case, the other split case is placed over one split case, and the capacitor body is covered with a pair of split cases. The joint part of the case is closed while pressure is applied in the stacking direction of each cell, and in this state, the divided cases are joined together along the joint part, and then the pressurizing force is removed.

[0009]

[Operation] According to the above structure, when the split cases are joined together, pressing force is applied uniformly to both sides of the capacitor body. Even if the pressurizing force is removed after the two divided cases are joined, the capacitor body remains pressurized inside the case.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. 1, 2(a) and 2(b) show a first embodiment of the method of this invention. The electric double layer capacitor shown in the figure has cells 1 constituting a single capacitor stacked in two layers (upper and lower), a capacitor body 3 with electrode plates 2 stacked on its upper and lower surfaces, and the capacitor body 3 housed in a pressurized state. A pair of split cases 4 are provided.

The cell 1 houses polarizable electrodes 1c inside a rectangular frame-shaped gasket 1a with a separator 1b in between, and conductive films 1d are arranged on the upper and lower surfaces of the gasket 1a to seal the inside. I did it,
The conductive film 1d located in the middle is a common electrode for both cells 1, and connects the cells 1 in series. Further, both the electrode plates 2 are in contact with the conductive films 1d on the upper and lower surfaces, and have tab terminal portions 2a for external connection from one end.
stands out.

The divided case 4 is divided into two parts in the stacking direction of the cells 1 in the capacitor body 3, and each has a tab terminal portion 2a projecting from the electrode plate 2 at one end thereof. A notch 4a is formed. When the divided case 4 is joined, the internal thickness D is set to the extent that a pressing force is applied to the capacitor body 3.

[0013] Furthermore, the material of the divided case 4 is stainless steel,
It is made of a metal plate such as aluminum, polyethylene, polypropylene, epoxy resin, etc. In this embodiment, since the metal material is used, the inside of the divided case 4 is coated with an insulating resin 5 to prevent electrical connection with the electrode plate 2. Ensures insulation.

Therefore, when the capacitor main body 3 is housed in one split case 4 and then covered with the other split case 4, the joint 4b of both split cases 4 is in an open state as shown in FIG. 2(a). It is. In this state, if pressing force F is applied to the top and bottom surfaces of both split cases 4, the joint 4
b is closed as shown in Figure 2(b), and the capacitor body 3
A uniform pressing force is applied in the stacking direction of the cells 1 to compress them. By welding the outside of the joint portion 4b by laser welding, spot welding, etc. while maintaining this pressing force, the two divided cases 4 are integrally joined. Even if the pressurizing force F is subsequently removed, the condenser main body 3 is kept in a pressurized state inside the two divided cases 4.

When the divided case 4 is made of a resin material, adhesive means such as adhesive or hot melt, or physical joining means such as a locking pawl and a locking groove can be provided.

FIG. 3 shows a second embodiment of the invention. In the figure, the divided case 10 consists of a box-shaped case main body 10a and a cover 10b that covers the opening surface of the case main body 10a. In this embodiment, the capacitor main body 3 is housed inside the case main body 10a, and then a cover 10b is placed on the capacitor main body 3, and a pressure is applied to the joint portion 1 between the two.
By welding 0c, the cover 10b is integrally joined to the case body 10a while maintaining the condenser body 3 in a pressurized state.

[0017]

[Effects of the Invention] As explained in detail in each of the embodiments above, in the method for packaging an electric double layer capacitor according to the present invention, when the split cases are joined together, the capacitor body in which the capacitor cells are stacked is Since the pressure is applied uniformly to both sides, there is no sealing failure due to uneven pressure, and even if the pressure is removed after the two split cases are joined, the capacitor body will remain inside the case. It has the advantage that it is maintained in a pressurized state and can prevent poor sealing performance due to compression recovery.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a completed exterior according to a first embodiment of the method of the present invention.

FIG. 2(a) is a cross-sectional view taken along the line AA in FIG. 1 before the split case is joined; (b) is a sectional view of the divided case in a joined state.

FIG. 3 is a perspective view of a completed exterior according to a second embodiment of the method of the present invention.

[Explanation of symbols]

1 cell 2　Electrode plate 3. Capacitor body 4,10 Split case 4b, 10c joint part

Claims (1)

[Claims] [Claim 1] An electric double layer capacitor comprising a capacitor body in which capacitor cells are stacked in multiple stages and electrode plates are stacked on the upper and lower surfaces of the capacitor body, and a pair of split cases that house the capacitor body in a pressurized state. In the packaging method, the capacitor main body is housed in one split case, the other split case is placed over the one split case, and the joints of the cases are pressed in the stacking direction of each cell of the capacitor main body. is closed, and in this state, the split cases are joined together along the joint part,
A method for packaging an electric double layer capacitor, the method comprising removing pressurizing force thereafter.