JP3111280U - Electrode plate for alkaline storage battery - Google Patents

Abstract

Provided is an alkaline battery electrode plate capable of preventing a welding sag or burr generated in a welded portion from passing through a separator and causing a short-circuit accident when a plate electrode ear is welded to a core body of the electrode plate by seam welding. To do.
An electrode plate for an alkaline storage battery in which electrode plates of different polarities having electrode tabs are stacked and used facing each other through a separator so that the electrode plate ears protrude in the same direction. The electrode plate is obtained by coating and filling the core with an active material, and a part of the core body protrudes above the height of the opposite electrode plate of opposite polarity, and the protruding counter electrode plate The electrode plate ear is welded and installed above the height.
[Selection] Figure 1

Description

The present invention relates to an alkaline storage battery, and more particularly, to an alkaline storage battery electrode plate in which a part of a core is protruded upward from a facing opposite electrode plate and the protruding portion and a current collecting ear are welded.

  Conventionally, an alkaline storage battery such as a nickel-cadmium storage battery is manufactured by laminating a plurality of positive and negative electrode plates with a separator interposed between them, and storing them in a battery case. The electrode plate for an alkaline storage battery is a sintered body in which a nickel powder slurry is applied and filled in a porous core body in which a large number of holes are drilled in nickel or a nickel-plated iron plate, and then sintered in a sintered substrate filled with an active material. A bonded electrode plate or a paste electrode plate obtained by applying and filling a paste-like active material to the porous core is used. And what attached the current collection ear to these electrode plates by welding is known.

For example, the positive electrode current collector ear is continuously welded to the belt-like positive electrode by a seam welder, and the negative electrode current collector ear is continuously welded to the belt-like negative electrode by another seam welder. The strip-like positive electrode and the strip-like negative electrode, each of which is seam-welded, are wound so that the positive electrode active material region and the negative electrode active material region are overlapped with each other via a strip-shaped separator. Is known (Patent Document 1).

Japanese Patent Laid-Open No. 10-189026 (see FIGS. 3 and 5)

  In the method described in Patent Document 1, a comb-shaped current collector ear is welded to a belt-shaped current collector using a seam welder to reduce the internal resistance in the length direction of the belt-shaped positive electrode, and the exposed side edge is machined. To reinforce. Further, in the cylindrical battery described in Patent Document 1, since the protruding portion of the comb-shaped current collecting ear protrudes in opposite directions from the both end surfaces of the positive electrode plate and the negative electrode plate, the problem of welding sag and burrs is not much considered. There was no need to do.

  However, in a prismatic battery in which the protruding part of the current collecting ear is in the same direction on the positive electrode plate and the negative electrode plate, when the metal melted at the end of the current collecting ear protrudes during seam welding, -Since the current collecting ears of the negative electrode plate are in the same direction, the current collecting ears and the vicinity thereof face the other electrode, which may cause a short circuit when the separator penetrates.

  The present invention solves these conventional problems, and polar plates having current collecting ears are arranged opposite to each other via a separator so that the current collecting ears protrude in the same direction. In the alkaline storage battery electrode plate to be used, the electrode plate is obtained by coating and filling the core with an active material, and a part of the core protrudes above the height of the opposing electrode plate of opposite polarity. The current collecting ear is attached to the protruding core body by welding.

  By using the electrode plate according to the present invention, a part of the core is protruded above the height of the opposite electrode plate of opposite polarity, and the current collecting ear is welded to the protruded core, Even if burrs occur, it is possible to prevent a short circuit due to the penetration of the separator.

  An embodiment of the present invention will be described with reference to FIGS. In the drawings, the same reference numerals indicate the same components.

An electrode plate for an alkaline storage battery according to the present invention is characterized in that a part of a core is protruded above the height of a counter electrode of opposite polarity, and current collecting ears are seam welded to the protruded core. To do.

FIG. 1 is a view showing a part of a state in which the alkaline storage battery electrode plate of the present invention is laminated. 1 is a positive electrode plate, 2 is a negative electrode plate, and 3 is a separator. As shown in the figure, the positive and negative electrode plates 1 and 2 have the same size, and the electrode plate ears 11 and 21 are attached to the upper portions of the electrode plates, respectively. It is formed at the end so as to become, but are stacked opposite to each other so as to protrude in the same direction. At that time, the welded portion a between the electrode plate and the electrode plate ear is located above the height of the mating electrode plate. Usually, a large number of these positive and negative electrode plates 1 and 2 are laminated to form an electrode plate group, and electrode plate ears 11 and 21 of the electrode plates of the same polarity are bonded and welded to the pole column terminals, and are stored in the battery case and are square. An alkaline storage battery is produced.

FIG. 2 is a diagram of the positive electrode plate 1. The positive electrode plate 1 is formed with a solid portion where no holes are formed at both ends, and an active material layer 12 is formed by filling an active material into a porous core body having a large number of holes drilled at the center. It is made by cutting. And the plain part 13 below the core body cuts a part slightly away from the active material layer to leave a little plain part 13, while the upper plain part 14 greatly protrudes only a part from the active material layer, As in the lower part, the part slightly separated was cut, and this protruding part was used as the electrode plate mounting part 15. Then, separately prepared electrode plate ears 11 are attached to the attachment portion 15 by seam welding. At this time, welding of the electrode plate ear 11 to the mounting portion 15 is performed sufficiently above the other portion of the upper plain portion 14, and even if welding sag or burr occurs, the upper plain portion 14 indicated by a dotted line. It was made not to hang on the corresponding position of other parts. The welding position of the electrode plate ear is 1 mm or more, preferably 2 mm or more from the corresponding position.

Note that welding is not limited to seam welding, and spot welding or the like may be used.

  A long core made of nickel-plated iron has a solid state on both sides in the length direction, and a large number of holes are formed by punching in the center. The sintered substrate coated with nickel powder was impregnated with a positive electrode active material made of nickel hydroxide, and cut into a predetermined shape as shown in FIG. Reference numeral 12 denotes an active material layer in which an active material is applied to the porous core, 13 denotes a lower plain portion where no active material is applied, and 15 denotes a protruding mounting portion formed by punching and forming the upper plain portion 14. To this, a strip-shaped electrode plate ear 11 formed by punching separately from a nickel plate is superposed on a mounting portion 15 formed to project from the positive electrode plate 1. The electrode plate 11 and the positive electrode plate 1 were seam welded to each other by pressurizing between the rotating disk electrodes (not shown). In this embodiment, the electrode plate 11 was welded at a position 2 mm above the corresponding position of the other portion of the upper plain portion 14. In addition, a is a welding part.

  On the other hand, the negative electrode plate uses a long porous core similar to the positive electrode plate, and is coated with a paste-like negative electrode active material made of cadmium hydroxide and punched into the same size as the positive electrode plate. Similarly to the positive electrode plate, the electrode plate ear was seam welded to the protruding mounting portion.

(Comparative Example 1)
As shown in FIG. 3, a positive electrode plate and a negative electrode plate are formed in the same manner as in the example except that the plain portion and the attachment portion are not formed on the core of the electrode plate, and a part of the active material is removed to the electrode plate. The ear was welded.
(Comparative Example 2)
As shown in FIG. 4, a positive electrode plate and a negative electrode plate were formed in the same manner as in the example except that the attachment portion protruding from the core of the electrode plate was not formed, and the electrode plate ear was welded to the upper plain portion.

  As shown in FIG. 1, 16 positive electrode plates and 15 negative electrode plates obtained in the above-described embodiment are protruded in the same direction as shown in FIG. 1, and a laminated separator in which a polypropylene film is sandwiched between two laminated polypropylene nonwoven fabrics. The electrode plates were alternately laminated to be housed in a battery case, and an open prismatic alkaline storage battery was produced.

  Similarly, using the positive and negative electrode plates obtained in Comparative Examples 1 and 2, similar open-type prismatic alkaline storage batteries were produced.

  120 pieces of these alkaline storage batteries were produced and subjected to a cycle life test. In Comparative Example Storage Battery 1 using the electrode plate of Comparative Example 1, 3 out of 120, and in Comparative Example Storage Battery 2 using the electrode plate of Comparative Example 2, 1 out of 120 was abnormal in voltage. As a result of the dismantling, the burrs at the ear welded part penetrated the separator and were short-circuited. In the prismatic alkaline storage battery using the electrode plate of the present invention, the presence of burrs was confirmed, but none was short-circuited.

In the above embodiment, when the lower end portion of the electrode plate ear is welded to the attachment portion, the entire surface of the lower end portion that overlaps the attachment portion is seam welded, but the width of the electrode plate ear, the lower end and the side end is about 1 mm. In this case, an unwelded portion may be formed. Further, the welding is not limited to seam welding but may be performed by spot welding or the like.

  As a result of the above, since the electrode plate ear was welded to the mounting portion protruding above the height of the counter electrode plate, even if welding sag or burr occurred, there was no short circuit with the counter electrode through the separator, Short circuit can be prevented.

The slant figure of the electrode plate of one Example of this invention. The front view which shows the positive electrode plate of one Example of this invention. The front view which shows the positive electrode plate of a prior art example. The front view which shows the positive electrode plate of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positive electrode plate 11 Electrode plate ear 12 Active material layer 13 Lower plain part 14 Upper plain part 15 Mounting part 2 Negative electrode plate 21 Electrode plate ear 3 Separator 4 Separately formed electrode plate ear a Welded part

Claims (1)

An electrode plate for an alkaline storage battery in which different polarity electrode plates having electrode plate ears are stacked and used facing each other through a separator so that the electrode plate ears protrude in the same direction. Is an active material coated and filled on the core, and a part of the core projects above the height of the opposing opposite polarity counter electrode plate, and above the protruding counter electrode plate height. An electrode plate for an alkaline storage battery, which is formed by welding electrode plate ears.