JPH0334256A - Cylindrical hermetic type alkaline storage battery - Google Patents

Abstract

PURPOSE:To enhance air tightness by an upper cover at a sealing section by providing a collector section for the bottom section of a container, which concurrently acts as the reinforcing member of the bottom section. CONSTITUTION:A projected groove 2 in a rectangular or a semi-circular shape in cross section is formed in the radial direction from the center of the bottom section at its inner side of a container 1. The groups of electrodes which are spirally winded up, are inserted into the container 1 while a collector terminal is welded onto each side of positive electrodes, but no collector terminal is welded onto each side of negative electrodes, pressure is applied from the top side, and electricity is thereby collected by the projected groove 2. Deformation due to internal and/or external force applied onto the bottom section can thereby be prevented by means of the projected groove 2 provided for the bottom section of the container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to sealed cylindrical alkaline storage batteries, particularly nickel-based alkaline storage batteries.
The present invention relates to a cadmium storage battery (hereinafter abbreviated as Ni-Cd battery).

Conventional technology Conventionally, Ni-Cd batteries are generally cylindrical in order to be compatible with dry batteries, and the bottom of the container 1 has the following shape.
They were either flat as shown in Figure 3(a), or stepped for reinforcement purposes as shown in Figure 3(b).

In addition, in order to reduce the internal resistance of the battery as much as possible to collect current from the electrode group, plate-shaped terminals 6.7 are connected to the anode and cathode plates 3.7 as shown in FIG.
4 are welded to the top and bottom of the wound battery group with a separator 5 in between, and the anode side is provided with a lead part and is welded to the top lid, and the cathode side is welded to the bottom of the container, or the lead part is provided and makes contact with the side surface of the container. (Japanese Utility Model Publication No. 58-70671).

Problems to be Solved by the Invention However, with the above conventional container shape and welding method,
The structure is weak against swelling at the bottom due to the upper limit of internal pressure during charging and denting due to external pressure or impact. Furthermore, when welding the current collector terminal to the container, the cost increases because in welding on the cathode side, the electrode is inserted into the hole in the center of the electrode plate group and welded to the bottom. In addition, when providing a lead part on the cathode current collector terminal and bringing it into contact with the side surface of the container, the contact pressure will vary depending on the size of the outer diameter of the electrode group, resulting in a change in contact resistance and movement of the electrode group due to iJj 'J/vibration. There was a problem.

In view of the above points, it is an object of the present invention to provide a structure that reduces the cost by 1 or more by providing a drip collecting section that also serves as reinforcement for the bottom of the container.

Means for Solving the Problems As shown in FIG. 1, the present invention provides square or semicircular protruding grooves 2 radially from the center inside the bottom of a container 1, and an electrode group wound in a spiral shape on the anode side. The present invention is characterized in that the current collecting terminal is welded in a conventional manner, and the cathode side is inserted into the container without welding the current collecting terminal, pressurized from above, and current is collected through the protruding groove.

The protruding groove 2 provided on the bottom of the working container 1 prevents deformation due to internal and external forces applied to the bottom. Furthermore, by collecting current through the protruding groove, the cathode side current collecting terminal is no longer required.
Can be manufactured cheaply.

Example An embodiment of the present invention will be described.

The model used was an N120O5C type Ni-Cd battery.

A cathode plate 4 with a width of 34 mm and a length of 250 mm, and a width of 34 Tl
M11, length 5 x 3 and wound into a spiral shape, height 3
An electrode group with a diameter of 6 mm and an outer diameter of 21 mm was prepared.

Container 1 has a height of 43 mm, an outer diameter of 22 mm, and a meat IO of 4 mm.
Six protrusion grooves 2 having a depth of 11 Tl [l] as shown in FIG. 1(a) were cut into a stainless steel one.

A current collector terminal 6 was welded to the anode plate 3 of the electrode group, and the container 1 was housed in the container 1. In order to seal the container 1, the upper part of the container 1 was squeezed to a depth of 3 mm and the container was sealed with an upper lid 9.

After that, in order to obtain negative 4b□ electricity, the battery was inserted into a cylindrical mold, and 400 to 500 kg/c+ was applied from the top.
It was molded by applying a load of a (see Fig. 2). Note that 8 is an insulator.

Effects of the Invention As described above, according to the present invention, the bottom of the container is reinforced with protruding grooves, and the protruding grooves are used to collect current on the electrode plate side, thereby preventing swelling due to increased battery internal pressure and external forces during charging. It has become superior to dents caused by (pressure, impact). Further, conventionally, the cathode terminal was welded and the terminal was welded to the container, which resulted in high cost.The present invention has the advantage that this process can be omitted and the product can be manufactured at low cost.

In addition to the above effects, there are also the following effects.

Finally, pressure molding is performed, which improves the airtightness of the sealing area with the top lid.

[Brief explanation of drawings]

Figure 1 shows the shape of the protrusion groove provided on the bottom of the present invention, (a) and (b) are side views, (C) is a view seen from the bottom, and Figure 2 is an embodiment of the present invention. FIG. 3 is a diagram showing the shape of a conventional container, and FIG. 4 is a diagram showing a conventional electrode cluster charging system. plate, 5 is a separator, 6 is an anode current collector terminal, 9 is an anode terminal and upper cover Fig. 1 (α) (b) Fig. 4

Claims (2)

[Claims] (1) In a cylindrical sealed alkaline storage battery in which an electrode group consisting of an anode plate and a cathode plate are spirally wound with a separator in between, which is housed in a cylindrical container, three to three A cylindrical sealed alkaline storage battery characterized by having six protruding grooves. (2) The cylindrical sealed alkaline storage battery according to claim 1, wherein current is collected by bringing the electrode group into pressure contact with the bottom of the cylindrical container.