JP2000243433A - Cylindrical alkaline storage battery and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical alkaline storage battery low in internal resistance, excellent in large-current discharging characteristics, and excellent in vibration resistance and shock resistance. SOLUTION: This cylindrical alkaline battery is made up by housing an electrode group 4 formed by spirally winding a strip-like positive electrode plate 1, a negative electrode plate 2, and a separator 3, in a metallic case 5, and sealing up an opening part of the metallic case 5 by means of a gasket. Side edge parts of the positive electrode plate 1 projecting above the electrode group 4 are jointed to an under surface of a seal plate 6 directly or by means of an upper current collector and side edge parts of the negative electrode plate 2 projecting under the electrode group 4 are electrically connected to a bottom part of the metallic case 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical alkaline storage battery used for a large current, such as a drive power supply, and more particularly to a reduction in the number of structural parts, a suppression of the battery internal resistance, and an improvement in a large current discharge characteristic. And a cylindrical alkaline storage battery.

[0002]

2. Description of the Related Art Nickel-cadmium storage batteries and nickel-hydrogen storage batteries are representative of alkaline storage batteries. These batteries have high reliability and are easy to maintain. Widely used for. In recent years, there has been a demand for the development of a cylindrical alkaline storage battery suitable for large-current discharge as a power source for cordless electric tools, power assisted bicycles, hybrid electric vehicles, and even electric vehicles.

Conventionally, such a cylindrical alkaline storage battery for discharging a large current has an electrode plate group in which a long strip-shaped positive and negative electrode plate is spirally wound together with a separator for separating the two electrode plates. It is stored in a metal battery case.
Suitable for large current discharge, as an input / output current collecting structure from the electrode plate, one side edge along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and extends along the longitudinal direction of the negative electrode plate. The electrode group is configured such that a side edge opposite to the one side edge protrudes below the electrode group, and a plurality of rectangular or substantially disc-shaped current collectors are provided at each protruding portion. And a tab terminal is resistance-welded to the upper current collector on the positive electrode side, and the other end of the tab terminal is resistance-welded to the lower part of the sealing plate (for example, Japanese Patent Laid-Open No. 249854). The lower current collector on the negative electrode side is connected to the bottom of the metal case by a tab terminal or the like.

FIG. 5 shows the structure of a conventional cylindrical alkaline storage battery disclosed in Japanese Patent Application Laid-Open No. 4-249854. An upper current collector 21 is joined to the protruding portion 1a of the positive electrode plate 1 in the electrode plate group 4 by resistance welding, and one end of a tab terminal 21a is joined to the upper current collector 21 by resistance welding. The other end of the terminal 21a is welded to the lower part of the sealing plate 6 (the filter part 6b). In addition, electrode plate group 4
A lower current collector 22 is resistance-welded to the protruding portion 2 a of the negative electrode plate 2, and a tongue piece 22 a cut and raised from the current collector 22 is welded to the bottom of the metal case 5.

[0005]

The tab terminals 21a and the current collectors 21 and 22 used in the conventional cylindrical alkaline storage battery as described above are composed of a sealing plate 6 and a metal case 5 which are external terminals and a power generating element. This is a part for electrically connecting a certain electrode plate group 4. Even if the shape or the material is changed and the specific resistance value of the electrode group 4 itself is reduced, it does not become 0, and the large current discharging performance is hindered. Was something. In addition, when the battery is subjected to strong vibration or impact, the electrode plate group 4 moves within the metal case 5, so that the welded portion between the tab terminal 21a and the lower portion of the sealing plate 6 may come off, and the vibration resistance of the battery may be reduced. And poor impact resistance.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a cylindrical alkaline storage battery having excellent large current discharge characteristics and excellent vibration resistance and shock resistance. Another object of the present invention is to provide a method for manufacturing such a cylindrical alkaline storage battery.

[0007]

According to the present invention, a strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between the two electrode plates are spirally wound into an electrode group, and the electrode group is housed inside. A metal case in which the upper opening of the metal case is sealed via a gasket and a metal sealing plate provided with a cap-shaped terminal on the upper side, and one side edge along the longitudinal direction of the positive electrode plate Part protrudes above the electrode plate group, a side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes below the electrode plate group, and the protruding portion of the negative electrode plate is The present invention relates to a cylindrical alkaline storage battery which is electrically connected to a bottom of a metal case, and a protruding portion of the positive electrode plate is joined to a lower surface of the sealing plate directly or via an upper current collector.

The present invention relates to an electrode plate group in which a strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between the two electrode plates are spirally wound, and one side edge along the longitudinal direction of the positive electrode plate is provided. A part protrudes above the electrode plate group, and a side edge part opposite to the one side edge part along the longitudinal direction of the negative electrode plate projects downward from the electrode group inside the metal case. Receiving the negative electrode plate, electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case, electrically connecting a metal sealing plate to the protruding portion of the positive electrode plate, and opening the upper portion of the metal case. A method for manufacturing a cylindrical alkaline storage battery having a step of sealing a portion with a gasket interposed between the metal sealing plate and the metal case, wherein the metal sealing plate is electrically connected to a protruding portion of the positive electrode plate. The step of connecting the upper portion to the protruding portion of the positive electrode plate Step of joining the current collector, and contacting the metal sealing plate directly or through a nickel braze to the upper surface of the upper current collector in the metal case, and irradiating the laser to the sealing plate from above the sealing plate, A method of manufacturing a cylindrical alkaline storage battery, comprising joining the upper current collector to a lower surface of the sealing plate.

Further, the present invention relates to an electrode plate group in which a strip-shaped positive electrode plate, a negative electrode plate and a separator inserted between the two electrode plates are spirally wound, and one side along the longitudinal direction of the positive electrode plate. The edge protrudes above the electrode plate group, and the side plate opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes below the electrode plate group. Housing the inside, electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case, electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate, and upper portion of the metal case A method for manufacturing a cylindrical alkaline storage battery, comprising a step of sealing an opening with a metal sealing plate and a gasket interposed between the metal sealing plate and a metal case, wherein the metal sealing plate is electrically connected to a protruding portion of the positive electrode plate. Connecting to the protruding portion of the positive electrode plate. Step bonding the upper collector, and the metal sealing plate is contacted directly or via nickel brazing on the upper surface of the upper collector in a metal case,
A method for manufacturing a cylindrical alkaline storage battery, comprising joining the upper current collector to the lower surface of the sealing plate by irradiating the sealing plate with a laser from above the sealing plate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a strip-shaped positive electrode plate, a negative electrode plate and a separator inserted between the two electrode plates are spirally wound, and the electrode plate group is housed inside. A metal case, and a metal sealing plate provided with a cap-shaped terminal at the top while sealing the upper opening of the metal case via a gasket, and one side edge along the longitudinal direction of the positive electrode plate is provided. A side edge protruding above the electrode group, a side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes below the electrode group, and a protruding portion of the negative electrode plate is the metal case. And a cylindrical alkaline storage battery electrically connected to the bottom of the sealing plate and having a protruding portion of the positive electrode plate joined to a lower surface of the sealing plate. In a preferred aspect of the present invention, a joint between the projecting portion of the positive electrode plate and a lower surface of the sealing plate is formed by a joint by welding. In another preferred aspect of the present invention, a joint between the projecting portion of the positive electrode plate and a lower surface of the sealing plate is formed by a joint made of nickel brazing.

The present invention provides an electrode group in which a strip-shaped positive electrode plate, a negative electrode plate and a separator inserted between both electrode plates are spirally wound, a metal case accommodating the electrode group inside, The upper opening of the metal case is sealed with a gasket and a metal sealing plate provided with a cap-shaped terminal at the top is provided, and one side edge along the longitudinal direction of the positive electrode plate is an electrode plate group. A side edge protruding upward and opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes below the electrode plate group, and a protruding portion of the negative electrode plate is electrically connected to a bottom of the metal case. And a cylindrical alkaline storage battery in which the protruding portion of the positive electrode plate is joined to the lower surface of the sealing plate via an upper current collector. In a preferred aspect of the present invention, the protruding portion of the positive electrode plate and the upper current collector, and the upper current collector and the lower surface of the sealing plate are respectively bonded by welding. In another preferred aspect of the present invention, the projecting portion of the positive electrode plate and the upper current collector are joined by a joining portion by welding, and the lower surface of the upper current collector and the lower surface of the sealing plate are joined by a joining portion of nickel brazing. Have been.

In the above, it is most preferable that the protruding portion of the negative electrode plate is joined to the bottom of the metal case. Here, it is preferable that a joint between the projecting portion of the negative electrode plate and the metal case is formed by a joint by welding. A joint between the protruding portion of the negative electrode plate and the metal case may be a joint made of nickel brazing.

In another aspect of the present invention, the protruding portion of the negative electrode plate is joined to the bottom of the metal case via a lower current collector. In this case, it is preferable that the protruding portion of the negative electrode plate and the lower current collector, and the lower current collector and the bottom surface of the metal case are respectively joined by welding joints. The projecting portion of the negative electrode plate and the lower current collector may be joined by a joining portion by welding, and the lower current collector and the bottom surface of the metal case may be joined by a joining portion of nickel brazing.

In a preferred aspect of the method for manufacturing a cylindrical alkaline storage battery according to the present invention, the step of electrically connecting the metal sealing plate to a protruding portion of the positive electrode plate includes connecting the metal sealing plate to the positive electrode in a metal case. The projection of the positive electrode plate is joined to the lower surface of the sealing plate by irradiating a laser to the sealing plate from above the sealing plate directly or in contact with the projecting portion of the plate via a nickel solder. In another aspect of the method for manufacturing a cylindrical alkaline storage battery according to the present invention, the step of electrically connecting the metal sealing plate to the projecting portion of the positive electrode plate includes joining an upper current collector to the projecting portion of the positive electrode plate. And contacting the metal sealing plate with the upper surface of the upper current collector directly or through a nickel brazing in a metal case, and irradiating the sealing plate with a laser from above the sealing plate, thereby forming the upper current collecting plate. Joining the body to the lower surface of the sealing plate.

In the above, the step of electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case includes bringing the protruding portion of the negative electrode plate into contact with the bottom of the metal case directly or through a nickel brazing; It is preferable that the projecting portion of the negative electrode plate is joined to the bottom of the metal case by irradiating a laser to the outer bottom surface of the metal case. Electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case, bonding a lower current collector to the protruding portion of the negative electrode plate, and attaching the lower current collector to the bottom of the metal case. The lower current collector may be bonded to the bottom of the metal case by directly or through a nickel brazing and irradiating a laser to the outer bottom surface of the metal case.

The nickel brazing used here is a sheet-like one interposed at the joint, or a powdery nickel brazing is applied to the bottom of the metal case or the filter of the sealing plate in advance by reflow.

It is preferable to provide a linear projection on the joint surface of the bottom of the metal case with the protruding portion of the negative electrode plate, since the joint between the bottom of the metal case and the tip of the negative electrode plate becomes stronger. Similarly, it is preferable to provide a linear projection on the lower surface of the sealing plate at the joint surface with the protruding portion of the positive electrode plate, since the bonding between the lower portion of the sealing plate and the protruding portion of the positive electrode plate becomes stronger.

[0018]

Next, a specific embodiment of the present invention will be described with reference to the drawings. The drawings shown below are only schematic, and the relative sizes and positions of the components are not always accurate. Example 1 An electrode group 4 was formed by spirally winding a strip-shaped positive electrode plate 1, a strip-shaped negative electrode plate 2, and a strip-shaped separator 3 interposed between both electrode plates. At this time, one side edge 1a along the longitudinal direction of the positive electrode plate 1 projects above the electrode group, and the other side edge 2a along the longitudinal direction of the negative electrode plate 2 extends below the electrode group. The electrode group 4 was configured to protrude. The electrode plate group 4 is inserted into the metal case 5, and the bottom of the metal case 5 is irradiated with a laser from below, and the projection 2 a of the negative electrode plate 2 that is in contact with the bottom of the metal case is moved to the bottom of the metal case 5. Joined.

Next, as a part of the metal sealing plate 6, a valve port 6
A filter section 6b having a and a cap-shaped terminal 6c are prepared. In addition, insulating rings 7a and 7b and valve port 6a
Is provided with a rubber valve 8 for closing the valve. First, the filter unit 6b
The insulating ring 7a was arranged on the electrode plate group 4, and a groove 5 was formed in the upper part of the metal case 5 from the outer surface to form a step 5a. Next, the upper surface of the filter portion 6b was irradiated with laser to weld the projection 1a of the positive electrode plate to the lower surface of the filter portion 6b. Next, an electrolytic solution was injected into the electrode group from the valve port 6a of the filter section 6b. Thereafter, the opening end of the metal case 5 is caulked inward with an insulating ring 7b interposed between the periphery of the filter portion 6b and the metal case 5 to fix the filter portion 6b. , The cap-shaped terminal 6c was placed on the filter portion 6b, and a laser was applied to the peripheral portion of the cap-shaped terminal 6c from above to join the filter portion 6b. Thus, the cylindrical alkaline storage battery A of the present embodiment
Was assembled. FIG. 1 shows a longitudinal sectional view of the battery A.

Next, a cylindrical alkaline storage battery of a comparative example was constructed. Similarly to the above-described embodiment, the strip-shaped positive electrode plate 1 and the strip-shaped negative electrode plate 2 and the separator 3 interposed therebetween are spirally wound so that one side edge 1a of the positive electrode plate 1 is projected upward, The electrode group 4 was formed by protruding one side edge 2a of the negative electrode plate 2 downward. An upper current collector 21 having a hole at the center is joined to the protruding portion 1a of the positive electrode plate 1 in the electrode plate group 4 by resistance welding, and a lower portion formed by cutting and raising a tongue piece 22a on the protruding portion 2a of the negative electrode plate 2 The current collector 22 was joined by resistance welding. The electrode group 4 is inserted into the metal case 5 and the upper current collector 21 is inserted.
A welding electrode is inserted through the center hole of the electrode plate group and the center hole of the electrode plate group, and the tongue piece 22a is joined to the bottom of the metal case 5 by resistance welding while pressing the tongue piece 22a of the lower current collector 22. did.

Next, one end of the tab terminal 21a was joined to the upper current collector 21 by resistance welding, and the other end of the tab terminal 21a was joined to the filter portion 6b of the sealing plate 6 by resistance welding.
Next, an insulating ring 7a is assembled around the filter section 6b on the electrode plate group, and a groove is formed in the upper part of the metal case to form a step section 5a.
After the formation of the electrode group 4a, the alkaline electrolyte is poured through the valve hole 6a of the filter portion 6b and the central hole of the upper current collector 21a.
Was injected. Thereafter, the opening end of the metal case 5 is caulked inward with an insulating ring 7b interposed between the periphery of the filter portion 6b and the metal case 5 to fix the filter portion 6b. , The cap-shaped terminal 6c was placed on the filter portion 6b, and a laser was applied to the peripheral portion of the cap-shaped terminal 6c from above to join the filter portion 6b. Thus, a cylindrical alkaline storage battery C of a comparative example was assembled. FIG. 5 shows a longitudinal sectional view of this battery C.

The battery A of the example produced above and the battery C of the comparative example are compared below. As shown in FIG. 1, in the battery A according to the embodiment of the present invention, the protruding portion 2 a of the electrode plate group 4 below the negative electrode plate 2 is directly joined to the bottom of the metal case 5 without using a lower current collector. The protruding portion 1a of the electrode plate group 4 above the positive electrode plate 1 is directly joined to the filter portion 6b of the sealing plate 6 without using the upper current collector 21a or the tab terminal 21. As a result, the electrode group 4 as a power generating element is configured to be directly joined to the sealing plate 6 as an external terminal and the metal case 5 by a laser.
1. Because of the absence of the tab terminal 21a and the lower current collector 22, the battery has a lower resistance than the battery C.

In the battery C of the comparative example, the welding of the tab terminal 21a and the tongue piece 22a may come off when the electrode group 4 moves in the metal case 5 due to strong vibration or impact. However, in the battery A, the electrode group 4 is directly joined to each of the filter portion 6 b below the sealing plate 6 and the bottom of the metal case 5. In addition, since the joint by laser is stronger than the resistance welding, the joint is not detached by strong vibration or impact. as a result,
Battery A has better vibration resistance and impact resistance than battery C. Further, since the battery A has a lower resistance than the battery C, the battery A can have a higher current characteristic than the battery C.

<< Embodiment 2 >> In this embodiment, the protruding portion 1a of the positive electrode plate of the electrode plate group 4 is provided on the filter portion 6b of the sealing plate 6, and the protruding portion 2a of the negative electrode plate is provided on the bottom of the metal case 5, respectively. Bonded by brazing. The other configuration is the same as that of the first embodiment, and the joining method using the above nickel brazing will be described. First, before inserting the electrode plate group 4 into the metal case, a circular sheet-like nickel brazing material was placed on the bottom of the metal case 5. Then, after inserting the electrode plate group 4 into the metal case 5 with the protruding portion 2a of the negative electrode plate 2 facing down, the bottom of the metal case 5 is irradiated with laser from below the metal case 5,
The protruding portion 2a of the negative electrode plate 2 and the bottom of the metal case 5 were brazed by applying heat to the sheet-like nickel brazing material and melting it. Before placing the filter portion 6b of the sealing plate 6 on the electrode group 4, a sheet-like nickel brazing material is placed on the electrode group, and then the filter portion 6b and the insulating ring 7 are placed.
a was assembled on the electrode plate group, and was grooved in the upper part of the metal case 5. Then, a laser was irradiated onto the filter portion 6b, and the protruding portion 1a of the positive electrode plate was joined to the filter portion 6b by brazing.

In this embodiment, the joint surface between the projecting portion 1a of the positive electrode plate 1 and the filter portion 6b and the projecting portion 2a of the negative electrode plate 2
By interposing nickel brazing on the joint surface between the metal case 5 and the bottom of the metal case 5, the reliability of each joint can be improved, the internal resistance of the battery can be further reduced, and the vibration resistance and shock resistance can be improved. An excellent battery is obtained. This battery can provide excellent large-current discharge characteristics by reducing the resistance of the battery as described above.

In the present embodiment, a sheet-like brazing material is used. However, a powdery material is previously applied to the filter 6b of the sealing plate 6 and the joining surface of the bottom of the metal case 5 by reflow. You may keep it. Further, in the case of joining or brazing with a laser as described above, since the contact state of each joining surface affects the joining strength, as shown in FIGS. 3 and 4, the lower portion of the filter portion 16b of the sealing plate 6 and the metal The projecting portion 1a of the electrode plate group 4 is provided on the joint surface at the bottom of the case 15.
And 2a, for example, it is preferable to provide the projections 16 and 18 in the form of a semicircle in a radial arrangement. As a result, the protruding portions 1a and 2a of the electrode plate group bite into the respective projecting portions to be joined, and the contact strength is more reliably maintained and the joining strength is increased. Therefore, the resistance of the junction can be reduced, and the resistance of the battery can be further reduced.

Example 3 An electrode group 4 similar to that of Example 1 was formed by spirally winding a strip-shaped positive electrode plate 1, a negative electrode plate 2, and a separator 3 interposed between both electrode plates. A circular upper current collector 11 having a hole in the center is joined to the protruding portion 1a of the positive electrode plate 1 of the electrode plate group 4 by a laser.
A, a circular lower current collector 12 having a hole in the center was joined by laser. The lower current collector 12 and the metal case 5 are inserted into the metal case 5 by inserting the electrode plate group 4 having the current collectors joined up and down and irradiating the bottom of the metal case 5 with laser from below.
And the bottom.

Next, the filter portion 6b of the sealing plate 6 and the insulating ring 7a are arranged on the electrode group 4, and are grooved in the upper portion of the metal case 5 to form the step portion 5a.
b was irradiated with laser from above, and the upper current collector 11 was joined to the filter portion 6b. Next, an insulating ring 7b is interposed between the peripheral portion of the filter portion 6b and the metal case 5, and the opening end of the metal case 5 is crimped inward to form the filter portion 6b.
After fixing b, the alkaline electrolyte was injected into the electrode plate group through the valve port 6a of the filter portion 6b and the center hole of the upper current collector 11. Next, the rubber valve 8 is used to open the valve port 6 of the filter section 6b.
a, the cap-shaped terminal 6c is placed thereon, and the peripheral portion of the cap-shaped terminal 6c is irradiated with a laser from above, so that the cap-shaped terminal 6c is
b to form a cylindrical alkaline storage battery B of this example. This battery is shown in FIG.

The battery B of Example 3 produced above and the battery C of Comparative Example are compared below. As shown in FIG. 2, in the battery B of this embodiment, the upper current collector 11 is laser-welded to the protrusion 1 a of the positive electrode plate 1 in the electrode plate group 4, and the lower current collector is bonded to the protrusion 2 a of the negative electrode plate 2. The body 12 is laser welded. The upper current collector 11 is directly laser-welded to the filter portion 6b of the sealing plate 6 without using a tab terminal or the like, and the lower current collector 12 is also directly laser-welded to the bottom of the metal case 5. Thus, the battery has a lower resistance than the battery C because of the absence of the tab terminal.

In the battery C of the comparative example, the welding of the tab terminal 21a and the tongue piece 22a may come off when the electrode group 4 moves in the metal case 5 due to strong vibration or impact. On the other hand, in the battery B, the upper current collector 11 and the filter portion 6b below the sealing plate 6, and the lower current collector 12 and the metal case 5 are directly bonded by a laser. Therefore, the electrode plate group 4 does not move in the metal case 5, and since the joining by the laser is stronger than the resistance welding, the above-mentioned joining is not detached by strong vibration or impact. As a result, the battery B has better vibration resistance and impact resistance than the battery C. further,
Since the battery B has a lower battery resistance than the battery C, the battery B can have higher current characteristics than the battery C.

<< Embodiment 4 >> In this embodiment, the upper current collector 11 and the lower current collector 12 joined to the upper and lower sides of the electrode plate group 4 are each formed of a filter portion 6b of the sealing plate 6 by nickel brazing.
And joining to the bottom of a metal case 5. Therefore, the sheet-like nickel brazing set between the protruding portion 1a of the positive electrode plate and the filter portion 6b and between the protruding portion 2a of the negative electrode plate and the bottom of the metal case 5 according to the second embodiment is applied to the upper current collector 11 A cylindrical alkaline storage battery was assembled in the same manner as in Example 2 except that the battery was set between the lower current collector 12 and the bottom of the metal case 5, and between the lower current collector 12 and the bottom of the metal case 5.

The protruding portions of the positive / negative electrode plates in the above-described embodiments are formed, for example, on a nickel electrode in which a sponge-like porous metal substrate is used as a substrate and an active material mixture mainly containing nickel hydroxide powder is filled. A side edge portion that is hardly filled with the mixture is formed by compression. In a hydrogen storage alloy electrode in which a copper thin plate is used as a support and hydrogen storage alloy powder is supported on the copper thin plate, the electrode is formed at the side edge of the copper thin plate that does not support the hydrogen storage alloy powder. In the case of a sintered electrode, the core material portion in the sintered substrate is exposed.

In each of the above embodiments, the method of electrically connecting the protruding portion of the positive electrode plate, the sealing plate, the protruding portion of the negative electrode plate and the bottom of the metal case in the electrode plate group is the same. They need not be the same. However, it is most preferable that the protrusion of the positive electrode plate and the protrusion of the sealing plate, the protrusion of the negative electrode plate and the bottom of the metal case are directly bonded to each other without bonding the current collector to the upper and lower sides of the electrode plate group. In such a configuration, the projection of the positive electrode plate and the lower portion of the sealing plate,
In addition, since the protruding portion of the negative electrode plate and the bottom of the metal case are directly joined without using a lead plate or the like, connecting parts such as a lead plate are eliminated, and an obstruction factor at the time of a large current discharge due to their specific resistance is eliminated. As a result, a cylindrical alkaline storage battery excellent in large current discharge can be obtained.

[0034]

As described above, according to the present invention, it is possible to provide a cylindrical alkaline storage battery having a simple structure, excellent vibration resistance and shock resistance, and excellent in large current discharge characteristics.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cylindrical alkaline storage battery according to one embodiment of the present invention, in which main parts are cut away.

FIG. 2 is a longitudinal sectional view of a cylindrical alkaline storage battery according to another embodiment of the present invention, in which main parts are cut away.

FIG. 3 is a perspective view of a filter unit according to still another embodiment of the present invention.

FIG. 4 is a perspective view of a metal case according to still another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a cylindrical alkaline storage battery of a comparative example, in which main parts are cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Electrode plate group 5 Metal case 6 Sealing plate 6a Valve port 6b Filter part 6c Cap-shaped terminal 7a Insulating ring 7b Insulating ring 8 Rubber valve 11 Upper current collector 12 Lower current collector

[Procedure amendment]

[Submission Date] December 13, 1999 (1999.12.
13)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

In the present embodiment, a sheet-like brazing material is used. However, a powdery material is applied in advance to the filter 6b of the sealing plate 6 and the joining surface of the bottom of the metal case 5 by reflow. You may keep it. Further, in the case of joining or brazing with a laser as described above, since the contact state of each joining surface affects the joining strength, as shown in FIGS. 3 and 4, the lower portion of the filter portion 16b of the sealing plate 6 and the metal The projecting portion 1a of the electrode plate group 4 is provided on the joint surface at the bottom of the case 15.
And 2a intersecting with each other, for example, a semi-cylindrical projection 18 and
17 are preferably arranged in a radial arrangement. As a result, the protruding portions 1a and 2a of the electrode group bite into the respective projecting portions to be joined, and the contact strength is more reliably maintained and the joining strength is increased. Therefore, the resistance of the junction can be reduced, and the resistance of the battery can be further reduced. In FIG.
Here, 16a represents a valve port.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (18)

[Claims] An electrode group in which a strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between the two electrode plates are spirally wound, a metal case accommodating the electrode plate group therein, and the metal A metal sealing plate provided with a cap-shaped terminal at the top while closing the upper opening of the case via a gasket, and one side edge along the longitudinal direction of the positive electrode plate is located above the electrode plate group. The side edge of the negative electrode plate opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes below the electrode plate group, and the protruding portion of the negative electrode plate is electrically connected to the bottom of the metal case. A cylindrical alkaline storage battery that is connected and has a protruding portion of the positive electrode plate joined to a lower surface of the sealing plate. 2. An electrode group in which a strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are spirally wound, a metal case accommodating the electrode plate group therein, and the metal The upper opening of the case is sealed with a gasket and a metal sealing plate provided with a cap-shaped terminal at the top is provided, and one side edge along the longitudinal direction of the positive electrode plate is located above the electrode plate group. The side edge of the negative electrode plate opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes below the electrode plate group, and the protruding portion of the negative electrode plate is electrically connected to the bottom of the metal case. A cylindrical alkaline storage battery which is connected and has a protruding portion of the positive electrode plate joined to a lower surface of the sealing plate via an upper current collector. 3. The cylindrical alkaline storage battery according to claim 1, wherein a linear projection is provided on a lower surface of the sealing plate at a joint surface with a protruding portion of the positive electrode plate. 4. The cylindrical alkaline storage battery according to claim 1, wherein a joint between the projecting portion of the positive electrode plate and a lower surface of the sealing plate is a joint by welding. 5. The cylindrical alkaline storage battery according to claim 1, wherein a joint between the protruding portion of the positive electrode plate and a lower surface of the sealing plate comprises a joint made of nickel brazing. 6. The cylindrical alkaline storage battery according to claim 2, wherein the projecting portion of the positive electrode plate, the upper current collector, and the lower surface of the upper current collector and the lower surface of the sealing plate are respectively joined by welding portions. 7. The projecting portion of the positive electrode plate and the upper current collector are joined by a joint by welding, and the lower current collector and the lower surface of the sealing plate are joined by a joint of nickel brazing. 2. The cylindrical alkaline storage battery according to 2. 8. The cylindrical alkaline storage battery according to claim 1, wherein a protruding portion of the negative electrode plate is joined to a bottom of the metal case. 9. The cylindrical alkaline storage battery according to claim 1, wherein a protruding portion of the negative electrode plate is joined to a bottom of the metal case via a lower current collector. 10. The cylindrical alkaline storage battery according to claim 8, wherein a joint between the projecting portion of the negative electrode plate and the metal case is formed by welding. 11. The cylindrical alkaline storage battery according to claim 8, wherein a joint between the projecting portion of the negative electrode plate and the metal case comprises a joint made of nickel brazing. 12. The projection of the negative electrode plate and the lower current collector, and the lower current collector and the bottom surface of the metal case are respectively joined by welding joints.
A cylindrical alkaline storage battery as described in the above. 13. The projection of the negative electrode plate and the lower current collector are joined by a joint by welding, and the lower current collector and the bottom surface of the metal case are joined by a joint of nickel brazing. 9. A cylindrical alkaline storage battery according to item 9. 14. The cylindrical alkaline storage battery according to claim 1, wherein a linear projection is provided on a bottom surface of the metal case at a joint surface with a protruding portion of the negative electrode plate. 15. An electrode plate group in which a strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between the two electrode plates are spirally wound.
One side edge along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and a side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate is an electrode plate group. Accommodating a group of electrode plates protruding downward into a metal case; electrically connecting a protruding portion of the negative electrode plate to a bottom portion of the metal case; connecting a metal sealing plate to a protruding portion of the positive electrode plate. A method of manufacturing a cylindrical alkaline storage battery, comprising: a step of electrically connecting; and a step of sealing an upper opening of the metal case with the metal sealing plate and a gasket interposed between the metal sealing plate and the metal case. The step of electrically connecting the sealing plate to the protruding portion of the positive electrode plate includes contacting the metal sealing plate directly or through a nickel braze with the protruding portion of the positive electrode plate in a metal case, and sealing the metal plate from above the sealing plate. Irradiate the plate with laser It allows the production method of the positive electrode plate cylindrical alkaline storage battery of the projecting portion consists of joining the lower surface of the sealing plate of. 16. An electrode group in which a strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are spirally wound,
One side edge along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and a side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate is an electrode plate group. Accommodating a group of electrode plates protruding downward into a metal case; electrically connecting a protruding portion of the negative electrode plate to a bottom portion of the metal case; connecting a metal sealing plate to a protruding portion of the positive electrode plate. A method of manufacturing a cylindrical alkaline storage battery, comprising: a step of electrically connecting; and a step of sealing an upper opening of the metal case with the metal sealing plate and a gasket interposed between the metal sealing plate and the metal case. Electrically connecting the sealing plate to the protruding portion of the positive electrode plate, bonding an upper current collector to the protruding portion of the positive electrode plate, and connecting the metal sealing plate to the upper current collector in a metal case. Directly on top or in sheet form Contacting through a nickel brazing, by irradiating a laser to the sealing plate from the top of the sealing plate, a cylindrical alkaline storage battery manufacturing method which comprises bonding the upper collector to the lower surface of the sealing plate. 17. The step of electrically connecting the projecting portion of the negative electrode plate to the bottom of the metal case, contacting the projecting portion of the negative electrode plate with the bottom of the metal case directly or through a nickel brazing, 17. The method for manufacturing a cylindrical alkaline storage battery according to claim 15 or 16, wherein a projected portion of the negative electrode plate is joined to a bottom portion of the metal case by irradiating a laser to an outer bottom surface of the metal case. 18. A step of electrically connecting the projecting portion of the negative electrode plate to the bottom of the metal case, joining a lower current collector to the projecting portion of the negative electrode plate, and The method according to claim 15, wherein the lower current collector is joined to the bottom of the metal case by directly or through a nickel brazing to the bottom of the metal case and irradiating a laser to an outer bottom surface of the metal case. 17. A method for producing a cylindrical alkaline storage battery according to item 16.