JPH0316213Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention is a battery for a sealed battery having a hermetic seal made of ceramic or glass, which is used for the purpose of completely sealing a battery such as a lithium thionyl chloride battery. It concerns the lid.

Conventional technology Conventionally, the ceramic hermetic seal of this type of battery has a hole in the ceramic that serves as an insulator between the positive and negative electrodes, and a metal pin that serves as the output terminal, or an output terminal and an electrolyte injection port. This is done by inserting a metal pipe, brazing it to ceramic, and then brazing the ceramic to the battery cover.

Hermetic sealing using glass is achieved by inserting a metal pin or pipe serving as an output terminal into an opening provided in the battery, and sealing the space between them with glass.

FIG. 2 shows the structure of a conventional hermetic seal made of ceramic. Reference numeral 1 denotes a ceramic serving as an insulator, 2 a battery lid to which the ceramic is brazed, and 3 a metal pipe serving as an output terminal brazed to a hole provided in the ceramic 1 and an electrolyte injection port.

Problems to be Solved by the Invention In the case of this battery, either the output terminal 3 or the battery lid 2 is used as the positive electrode, and the other one is used as the negative electrode. Output one of the tabs on the book to terminal 3
will be connected to. Conventionally, a thin metal tab pulled out from the electrode group was spot welded to the output terminal 3, but because the cross-sectional shape of the output terminal 3 is circular, spot welding is difficult and increases the mechanical strength of the welded part. It was difficult. For this reason, there were problems such as the tab spot welded to the output terminal 3 easily coming off during handling after welding, and the heat of the joule melting when the battery was discharged with a large current. The same was true for hermetic seals made of glass.

The present invention aims to eliminate the above drawbacks.

Means for Solving the Problems In order to achieve this object, the present invention provides a battery lid for a sealed battery having a hermetic seal, an output terminal, and a metal plate for tab welding. The Tsukushiru part seals the hole in the battery cover through which the output terminal is passed through, and the metal plate for tab welding is connected to the output terminal inside the battery cover to form the battery cover for sealed batteries. This is what I did.

The stiffness makes it easy and reliable to weld the tab pulled out from the electrode group to the output terminal, avoiding problems such as the welding part coming off during battery assembly or melting at the welded part when discharged with a large current. It is something that will be done.

Example An embodiment of the present invention will be described with reference to FIG.

The output terminal 3 of the metal pipe is also passed through the hole provided in the ceramic 1, and when brazing with silver solder etc., the L-shaped metal plate 4 for tab welding, which has a hole through which the output terminal 3 passes, is passed through this. , ceramic 1, and output terminal 3 are simultaneously brazed and integrated. Thereafter, the metal battery cover 2 is opened and the ceramic 1 is brazed. The metal plate 4 for tab welding to be brazed according to the present invention has a thickness that has sufficient mechanical strength to eliminate the risk of contact with the battery can or lid 2 due to deformation during battery assembly. There is a need. Further, if the tab welding metal plate 4 is longer than the output terminal 3 as shown in the drawing, it will be easier to spot weld the tab pulled out from the electrode group.

For the output terminal 3 of the metal pipe, attach the battery lid 2 to the battery can, and after assembling the battery, inject an electrolyte such as thionyl chloride through the output terminal opening, and then seal the tip opening with a laser. It turns out.

Effects of the invention By attaching the metal plate for tab welding as described above, it is possible to reliably spot weld the current collection tab pulled out from the electrode group to the output terminal, and it is now possible to spot-weld the current collection tab pulled out from the electrode group to the output terminal. At the same time, there will be no troubles such as disconnection of the current collecting tab pulled out from the electrode group from the output terminal 3.
This has great practical value, as it enables batteries to be discharged with a large current.

[Brief explanation of the drawing]

FIG. 1 is a structural explanatory diagram of a battery lid for a sealed battery showing an embodiment of the present invention, and FIG. 2 is a structural diagram of a conventional battery lid for a sealed battery. 1 is a hermetic seal (ceramic, glass), 2 is a battery cover, 3 is an output terminal, and 4 is a metal plate for tab welding.

Claims (1)

[Claims for Utility Model Registration] A battery lid 2 for a sealed battery having a hermetic seal portion 1, an output terminal 3, and a metal plate 4 for tab welding, the hermetic seal portion 1 having an output A battery lid for a sealed battery, in which a terminal 3 is passed through to seal an opening in a battery lid 2, and a metal plate 4 for tab welding is connected to the output terminal 3 on the inside of the battery lid 2.