JPH02277217A - Aluminum electrolytic capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aluminum electrolytic capacitor used in general electronic equipment.

2. Prior Art As shown in FIG. 5, this type of conventional aluminum electrolytic capacitor consists of an anode foil 5 and a cathode, which are made by roughening a high-purity aluminum foil to increase its surface area and forming a dielectric oxide film through anodization. A lead plate 3 with lead wires 4 is connected to the foil 6, wound together with a separator 7, and impregnated with a driving electrolyte to form a capacitor element 8. Thereafter, as shown in FIG. 6, the capacitor element 8 is housed in a bottomed cylindrical metal case 9, the open end is sealed using a sealing member 10, and an insulating tube 11 is attached to complete the product.

The method for connecting the lead plate with lead wires is as follows: As shown in FIG.
A hole is made in the lead plate 3 and the foil 5 or 6 with a needle 15, and the resulting lead plate and the burr 16 of the foil are pressed and connected. A completed diagram of this connection method is shown in FIG.

Problems to be Solved by the Invention However, in such conventional aluminum electrolytic capacitors, even if the lead plate and the foil burr 16 are pressed, the protrusion remains at that part, which may break the separator and cause a short circuit. Since the separator becomes one piece, it is not possible to reduce the thickness of the separator, which hinders miniaturization.

On the other hand, a cold pressure welding method using a mold 17 shown in FIG. 9 is known as one method for connecting lead plates of lug terminal type aluminum electrolytic capacitors. Although this connection method is very effective in reducing short-circuit defects, it is necessary to reduce the thickness of the lead plate to 0.1 to 0.4.

Therefore, when this method is applied to a lead-shaped aluminum electrolytic capacitor, by reducing the thickness of the lead plate, the strength of the portion A shown in FIG. 4 is weakened, resulting in extremely poor vibration resistance.

In order to solve these problems, the present invention provides a lead-shaped aluminum electrolytic capacitor which reduces re-shorting defects and greatly contributes to miniaturization.

Means for Solving the Problems The means of the present invention for solving these problems uses a lead plate with lead wires whose thickness is reduced only in the part to be cold welded, and applies the cold pressure welding method to the anode foil and the cathode foil. It is connected with

Function: According to the aluminum electrolytic capacitor according to the present invention, short-circuit defects occurring at the connection portion between the lead plate and the foil can be drastically reduced, the separator thickness can be reduced, and the capacitor can be made smaller. In addition, the thickness of the lead plate other than the part where cold pressure welding is applied is the same as the conventional thickness, so there is no deterioration in strength (vibration resistance equivalent to the conventional one can be ensured).

Example Hereinafter, one embodiment of the present invention will be described using the drawings.

2 to 4 show an embodiment of the lead plate 13 with lead wires 14 of the present invention. Figure 2 a and b show the lead wire 14
This is a lead with a thinner part 13a so that the thickness of the lead plate 13 joined with the other parts 13b is 115 to 4/5 of that of the other part 13b. The thickness of the lead plate 13 may be reduced by cutting it off from both sides as shown in FIG. 3. Also, in FIG.
The lead is about 1.0 to 2.0 times wider than that of 3b. Using these pull-out lead plates 13 with lead wires, as shown in FIG.
At 3a, the anode foil 5 and the cathode foil 6 are overlapped and connected by cold pressure welding, and then wound together with the separator 7.
Impregnate with driving electrolyte. The capacitor element 8 is housed in a bottomed cylindrical metal case 9, the open end is sealed with a sealing member 1O, and an insulating tube 11 is attached to complete the aluminum electrolytic capacitor.

Effects of the Invention As described above, according to the present invention, short-circuit defects that occur at the connection between the lead plate and the foil are reduced, the thickness of the separator can be made thinner, the separator can be made smaller, and the vibration resistance is also higher than that of the conventional one. Equivalence can be guaranteed. Additionally, if a lead plate with a wider width is used, the connection area with the foil will be increased, which will have the effect of lowering the connection resistance.

[Brief explanation of drawings]

Figures 1a and b are a plan view and a side view of an aluminum electrolytic capacitor of the present invention in which a lead plate with a lead wire and a foil are connected by cold pressure welding, and Figures 2a and b are the main views of the aluminum electrolytic capacitor of the present invention. A front view and a side view of a drawer lead plate with lead wires according to one embodiment of the invention, FIGS. 3 and 4 are a side view and a front view showing another example of a lead plate with lead wires, and FIG. 5 is an aluminum lead plate with lead wires. FIG. 6 is a cross-sectional view of an aluminum electrolytic capacitor; FIGS. 7 a-c are cross-sectional views showing the conventional method of connecting lead plates and foil; FIGS. 8 a and b are cross-sectional views of the conventional A plan view and a side view showing the state in which the lead plate and the foil are connected, and FIGS. 9a to 9c are cross-sectional views showing the connection of the lead plate and the foil by the cold pressure welding method of a conventional lug terminal type aluminum electrolytic capacitor. . 5... Anode foil, 6... Cathode foil, 7...
... Separator, 8 ... Capacitor element,
13...Drawer lead plate, 13a...Thin portion, 14...Lead wire. Name of agent: Patent attorney Shigetaka Awano and one other famous confectionery (α) (b) (b)

Claims (5)

[Claims] (1) An aluminum electrolytic capacitor in which a lead plate with a lead wire attached to one end is connected by cold pressure welding, an anode foil and a cathode foil are wound together with a separator, and impregnated with a driving electrolyte to form a capacitor element. (2) The aluminum electrolytic capacitor according to claim 1, wherein the thickness of the portion of the lead plate to be joined by cold pressure welding is reduced. (3) The aluminum electrolytic capacitor according to claim 1, wherein the width of the portion where the lead plate thickness is reduced is increased. (4) The thickness of the lead plate to be reduced is 1/5 to 4 of the original thickness.
3. The aluminum electrolytic capacitor according to claim 2, wherein the aluminum electrolytic capacitor is: /5. (5) The width of the part where the lead plate thickness is reduced is 1.0 to 2.
The aluminum electrolytic capacitor according to claim 4, wherein the aluminum electrolytic capacitor is made 0 times wider.