JPH062216Y2 - Lead lead structure - Google Patents

Description

The present invention relates to a lead lead-out structure from a closed container, and is particularly suitable for a lead lead-out structure of a sealed battery such as a sealed lithium battery.

BACKGROUND OF THE INVENTION Conventionally, most battery containers such as lithium batteries have been made by caulking and fixing a positive electrode can and a negative electrode can via a gasket such as polyamide, but since they are prone to liquid leakage accidents, they have recently become airtight. Sealed batteries using terminals have been used for prizes.

FIG. 2 shows a sectional view of a main part of a conventional sealed lithium battery. In the figure, 1 is a stainless steel container body serving as a positive electrode, 2 is a battery assembly housed in the container body 1, 3
Is a lid made of an airtight terminal and is laser-welded to the container body 1. The lid 3 is formed by using a metal outer ring 4 obtained by drawing a stainless steel plate.
Is a plate-shaped portion 5, a tapered inner cylindrical portion 6 having a diameter that gradually rises from an inner end of the plate-shaped portion 5, and a plate-shaped portion 5.
And an outer tubular portion 7 rising from the outer end of the. Then, a pipe lead 8 made of an iron / chromium alloy is inserted into the inner tubular portion 6 and hermetically sealed with a soda-based glass 9. A lead lead 10 made of nickel, which is electrically connected to the negative electrode current collector of the battery assembly 2, is inserted into the pipe lead 8, and the outer end of the lead lead 10 and the outer end of the pipe lead 8 are connected to each other by a laser beam. It is electrically and mechanically connected and fixed by the melt 11 by irradiation, and is also sealed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, as described above, when the pipe lead 8 and the lead-out lead 10 are connected and fixedly sealed by the melt 11 by laser irradiation, the heat at the time of welding passes through the pipe lead 8 to the glass 9 Therefore, in order to prevent the glass 9 from being cracked by this thermal shock, the pipe lead 8
Since the height dimension H protruding from the glass 9 must be increased, the cost is increased and the entire size is increased.

Also, when the pipe lead 8 and the lead-out lead 10 are fixed by soldering, there is a similar problem.

Therefore, an object of the present invention is to provide a lead lead-out structure in which a glass crack does not occur due to laser welding or soldering and the height of the pipe lead is small.

Means for Solving the Problems In order to solve the above problems, the present invention hermetically seals a pipe lead to a tubular portion of a metal outer ring via glass, and inserts a lead-out lead into the pipe lead, In a lead lead-out structure in which a pipe lead and a lead-out lead are connected, fixed, and sealed, a bulging portion that protrudes in a radial direction is formed at an intermediate position between the fixing portion of the pipe lead and the lead-out lead and the glass sealing portion. It is characterized by having done.

Function In the above configuration, the bulging portion provided at the intermediate position of the pipe lead substantially extends the heat transfer path from the fixing portion of the pipe lead and the lead lead to the glass, and the heat at the time of fixing is transferred to the glass. The glass crack is prevented by alleviating this.

Moreover, since the height of the pipe lead does not increase, the overall size can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part of a sealed lithium battery which adopts a lead lead-out structure according to an embodiment of the present invention. In the figure, a pipe lead 13 forming a lid 12 has a bulging portion 13 protruding in a radial direction at an intermediate position between a glass 9 and a fixing portion using a melt 11 of a lead-out lead 10 by laser irradiation.
Since it is the same as that of FIG. 2 except that it has a, the same parts are designated by the same reference numerals and the description thereof is omitted.

According to the above configuration, since the bulging portion 13a is formed in the middle portion of the pipe lead 13, the heat transfer path length from the fixing portion of the pipe lead 13 and the lead-out lead 10 to the glass 9 is increased, and moreover, the pipe lead 13 Due to the improvement of the heat dissipation due to the increase in the surface area of 13, the amount of heat transferred from the fixed portion to the glass 9 is significantly reduced, and the occurrence of glass cracks can be prevented. Further, the height dimension h of the pipe lead 13 protruding from the glass 9 can be made significantly smaller than the height dimension H of the conventional pipe lead 8, and the entire battery can be miniaturized.

In the above embodiment, the pipe lead 13 and the lead-out lead 10 are fixed to the tip of the lead-out lead 10 by the melt 11 by laser irradiation, but may be fixed by soldering or the like.

Further, in the above embodiment, the case where only one bulge portion 13a is provided has been described, but a plurality of bulge portions 13a may be provided.

Further, although the inner tubular portion 6 is tapered, it may be in the shape of a right cylinder, or a resin such as epoxy for reinforcement and insulation may be attached to the outer surface side of the metal outer ring 4.

Effect of the Invention As described above, according to the present invention, since the pipe lead is provided with the bulging portion, the heat when the pipe lead and the lead-out lead are fixed is difficult to be transferred to the glass, and the glass crack is prevented, The height of the pipe lead is small and it can be miniaturized.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a sealed lithium battery adopting a lead lead-out structure according to an embodiment of the present invention. FIG. 2 is a sectional view of an essential part of a sealed lithium battery adopting a conventional lead-out structure. 4 ... Metal outer ring, 6 ... Inner cylindrical part, 9 ... Glass, 10 ... Lead, 11 ... Solder, 12 ... Lid, 13 ... Pipe lead, 13a ... Swelling part.

Claims (1)

[Scope of utility model registration request] 1. A pipe lead is hermetically sealed to a tubular portion of a metal outer ring via glass, a lead-out lead is inserted into the pipe lead, and the pipe lead and the lead-out lead are connected, fixedly sealed. In the lead lead-out structure, a bulge portion that protrudes in a radial direction is formed at an intermediate position between the fixing portion of the pipe lead with the lead-out lead and the glass sealing portion.