JPH11204101A - Electrode plate with lead lug for cylindrical alkali storage battery and the cylindrical alkali storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage battery which is free of increase in internal resistance of a winding electrode plate group and short-circuit by providing a coining plate part for mounting a lead lug curved in winding direction at a part of a side rim of a winding electrode plate, mounting a curved mounting plate part having the same curvature to form the plate part, and mounting it to the curved coining plate part. SOLUTION: A coining part 2 is formed by pressure-engraving a part thereof on an upper side rim of a positive electrode plate 1, and a lead lug 3 is mounted at a mounting plate part 3a to constitute the lead lug plate. A curved coining part 2 having a curved face 2a in winding direction of the electrode plate 1 is formed. The lead lug 3 is formed by pressurizing one of ends 3a of a longitudinal rectangular metal plate, and forms the curved mounting plate part 3a. The positive electrode plate 1 is capable of winding and curving the whole, and the curved mounting plate part 3a maintains a state contact with a full curved face, and is fixed by spot welding. An outer lead-out plate part 3b is left as a flat plate and is housed in the back side of a battery cap, and stable and good welding is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode plate with lead ears for a cylindrical alkaline storage battery and a cylindrical alkaline storage battery.

[0002]

2. Description of the Related Art A conventional cylindrical alkaline storage battery is formed by laminating a wound positive electrode plate and a wound negative electrode plate in a cylindrical bottomed battery can with a separator interposed therebetween, and spirally winding the same. The wound electrode plate group is housed, and the wound electrode plate used in the wound electrode plate group has a lead ear for electrically connecting the wound electrode plate to a battery lid or a battery can. Mounted. For example, as shown in FIGS. 6 and 7, a lead lug B for connecting to a battery lid is formed by stamping a part of the upper side edge of the electrode plate main body A into the coining portion a. Is formed, and a mounting plate portion b at one end of a long rectangular plate-shaped lead ear B is mounted on the coining portion a by spot welding.

[0003]

However, the positive electrode plate A to which the lead ears B are attached as described above is laminated on the negative electrode plate via a separator, and spirally wound to form a wound electrode plate group. When the electrode plate is formed, the electrode plate is curved, but the lead ear B is not curved and remains a flat plate, so that both side edges in the width direction of the lead ear B are released outward from the coining portion surface. The contact surface with the surface of the coining portion tends to separate and the internal resistance increases, and the corners on both sides of the lead ears B which protrude outwardly damage or break through the separator adjacent to the outside. As a result, inconveniences such as a short circuit with the negative electrode plate occurred. Accordingly, it is desired to develop an electrode plate with lead ears that can solve the conventional inconvenience and form an ideal group of wound electrode plates that are wound in a curved shape as a whole including the lead ears.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a winding electrode plate with lead ears for an alkaline storage battery which satisfies the above-mentioned needs. A part of the periphery is provided with a coining plate part for attaching a lead ear that is curved in the winding direction. On the other hand, as a lead ear, a mounting plate part that is attached to the curved coining plate part is the same as the curved surface of the coining plate part. A curved plate having a curved surface having a curvature is prepared, and the curved mounting plate of the lead ear is mounted on the curved coining plate of the winding electrode plate. Further, the present invention provides the above-mentioned electrode plate with lead ears of the present invention, wherein the electrode plate is provided so that the lead ear can be easily connected to the back surface of the battery lid or the bottom surface of the battery can. The outer lead-out plate portion other than the portion is formed in a flat plate portion. Further, the present invention provides a cylindrical alkaline storage battery in which the internal resistance of the wound electrode group is prevented from lowering and short-circuiting, and is stably provided. It is characterized by having a group.

[0005]

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 4
Shows an example of the embodiment of the present invention. In the drawings, reference numeral 1 denotes a wound positive electrode plate having a predetermined length and width used for a cylindrical alkaline storage battery. According to the present invention, a coining portion 2 is formed by stamping a part of the upper edge of the positive electrode plate 1 to attach a lead ear with good current collecting property, and the lead ear 3 is attached to the mounting plate. In forming the electrode plate with lead ears by attaching it at the portion 3a, the electrode plate 1 and the lead ears are formed as follows. That is, the coining part 2 is used as the electrode plate 1.
2 and 3, as shown in FIG. 2 and FIG.
That is, a product formed on a curved coining portion 2 having a curved surface 2a curved at a predetermined curvature in the winding direction is manufactured and prepared. On the other hand, the lead ear 3 is connected to one end 3a of a long rectangular metal plate having a predetermined length and width, that is, the curved coining portion 2 of the electrode plate 1 by spot welding or the like. The mounting plate 3a to be mounted is pressurized to prepare a curved mounting plate 3a as shown in FIG. In this case, the curved surface 3 of the curved mounting plate 3a
a1 is preferably formed to have the same curvature as the curvature of the curved surface 2a of the curved coining part 2, as shown in FIG.

The curved mounting plate for the lead ear 3 is attached to one of the curved surfaces 2a of the curved coining portion 2 of the wound electrode plate 1 manufactured as described above, in the illustrated example, to the concave curved surface 2a. The electrode plate 4 with lead ears according to the present invention is constituted by stacking the portions 3a with one curved surface 2a facing them and attaching them by spot welding in a usual manner. In addition, at least one concave space 2b formed on both surfaces of the curved coining 2 of the electrode plate 1 is formed such that the curved mounting plate portion 3a of the lead ear 3 mounted on the upper surface thereof is outward from the electrode plate 1 surface. It is preferable to form the member so as to have a depth that can be accommodated without protruding. The curvature of the curved coining portion 2 is such that when the electrode plate 1 is laminated with a winding electrode plate having a different polarity from the electrode plate 1 via a winding separator, and wound to form a group of wound electrode plates, It is preferable that the coining part 2 is set to match the radius of curvature according to the position in the radial direction from the center of the wound electrode group.

Thus, a wound electrode group is formed as described above in combination with the positive electrode plate 4 with lead ears of the present invention shown in the drawing. FIG. 5A shows the wound electrode group 5. Reference numeral 6 denotes a wound negative electrode plate, and 7 denotes a wound separator. In the wound positive electrode plate 1 of the wound electrode plate group 5 configured as described above, not only the curved coining portion 2 is formed in advance, but also the curved mounting plate of the lead ear 3 attached to the curved surface. Since the portion 3a is attached, as shown in FIG.
The whole can be wound and curved, and the curved mounting plate portion 3a of the lead ear 3 keeps the state in contact with the entire curved surface of the curved coining portion 2a, and both side edges of the width in the winding direction are formed. There is no short-circuiting caused by projecting outward from the curved surface of the curved electrode plate 1 to damage the wound separator 7 on the outer side or to break through and contact the negative electrode plate b on the outer side. The wound electrode plate group 5 having good stability can be configured. Thus, this is smoothly accommodated in the bottomed cylindrical battery can, and a stable cylindrical alkaline storage battery is obtained.

The outer end of the outer lead-out plate portion 3b of the above-mentioned positive electrode plate 4 with lead ears of the present invention, which extends upward from the upper side of the electrode plate 1 of the lead ear 3, is welded to the back surface of the battery lid. Therefore,
Since the back surface of the battery lid is flat, the outer lead-out plate portion 3b of the lead ear 3 is a flat plate as shown in FIG. Good and stable welding is possible.

Although the above-described embodiment shows an example in which the present invention is applied to a positive electrode plate with lead ears, it goes without saying that the present invention can also be applied to a negative electrode plate with lead ears. In this case, a curved coining portion is provided on a part of the lower edge of the winding electrode plate, and the curved mounting plate portion of the lead ear is attached to the curved coining portion.
Thus, the outer lead-out portion of the lead ear is welded to the bottom surface of the battery can to be accommodated.

[0010]

As described above, according to the present invention, a curved coining is provided on a part of the periphery of the wound electrode plate for an alkaline storage battery, and a curved mounting plate portion of the lead ear is attached to the curved coining portion. When a wound electrode plate group is constructed using this, the entire electrode plate, including the lead ear mounting portion, can be spirally wound. The above-mentioned disadvantages can be solved, and a wound electrode plate group and a cylindrical alkaline storage battery which are stable and free from increase in internal resistance and short-circuit can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of an electrode plate with lead ears for a cylindrical alkaline storage battery according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a perspective view of an example of a lead ear according to the present invention.

FIG. 5 (a) is a top view of a wound electrode group including the electrode plate with lead ears of the present invention.

FIG. 5 (b) is an enlarged top view of the wound electrode plate group shown in FIG. 5 (a) crossing the lead ear and the curved mounting plate portion of the lead ear at a location surrounding the lead ear;

FIG. 6 is a front view of a conventional electrode plate with lead ears for a cylindrical alkaline storage battery.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Winding electrode plate 2 Curved coining part 2a Curved surface 2b Concave space 3 Lead ear 3a Curved mounting plate part 3a1 Curved surface 3b Outwardly leading plate part 4 Electrode plate with lead ear 5 Winding electrode plate group

Claims (3)

[Claims] 1. A mounting plate which is provided on a part of the periphery of a winding electrode plate for mounting a lead ear which is curved in the winding direction, and which is mounted on the curved coining plate portion as a lead ear. A curved mounting plate portion having a curved surface having the same curvature as the curved surface of the coining plate portion is prepared, and the curved mounting plate portion of the lead ear is formed by the curved coining of the winding electrode plate. An electrode plate with lead ears for a cylindrical alkaline storage battery, wherein the electrode plate is attached to a plate portion. 2. The electrode plate with lead ears for a cylindrical alkaline storage battery according to claim 1, wherein the outer lead-out plate portion other than the curved mounting plate portion is formed in a flat plate portion. 3. A cylindrical alkaline storage battery comprising a wound electrode group comprising the electrode plate with lead ears according to claim 1 or 2 as a positive electrode and / or a negative electrode.