JP2000077078A - Battery with spiral electrode and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance mass-productivity, battery characteristics, and safety without generation of a spark in a production process by inclining and focusing a current collector exposed part of an electrode on one side in which a positive or negative active material is filled of a spiral electrode by a swelled-out part and a spacer made of an insulator, and performing strong pressure-contact against a projection formed in a dish plate. SOLUTION: An opening 1a of a battery container 1 is crimp-sealed with a sealing member B by bending inward the opening 1a through an insulating gasket 11, and a swelled-out part 1b projecting in the center axis direction is formed directly under the battery container 1 of the crimp-sealed part so that the width of a horizontal part for supporting the insulating gasket 11 becomes about 0.7 mm. A current collector exposed part 2a of a positive active material sheet of a spiral electrode is inclined and focused in the inner diameter direction by a swelled-out part 1b and a spacer 12 made of insulating synthetic resin, and strong pressure-contact is performed against a projection 9b formed in a dish plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery provided with a spiral electrode and a method for manufacturing the same. More specifically, the present invention relates to a method for manufacturing a battery by using an organic solvent as an electrolytic solution and pressing the battery container and the spiral electrode. The present invention relates to a battery provided with a spiral electrode in which connection is ensured, and a method for manufacturing the battery.

[0002]

2. Description of the Related Art A sheet-shaped negative electrode plate using a light metal such as lithium metal or a lithium alloy as a negative electrode active material, and a metal oxide such as manganese dioxide or iron disulfide, or a fluoride such as sulfide or graphite fluoride as a positive electrode active material. An organic electrolyte battery using a sheet-shaped positive electrode plate made of a substance and using an electrode body in which the positive and negative electrode plates are spirally wound via a separator has a high energy density,
Since it has characteristics of being suitable for high-rate discharge and having little self-discharge, it is used in many applications from industrial use to consumer use.

[0003] As an example of a method of manufacturing this kind of battery, the main points of the manufacturing method of a cylindrical lithium manganese dioxide battery will be described according to the steps.

Electrode forming step: A positive electrode active material mainly composed of manganese dioxide is filled in a current collector made of a conductor, and a current collector lead is fixed to a part of the current collector by welding to form a positive electrode sheet and metal lithium. A step of laminating a negative electrode plate sheet on which a current collector made of a conductor is fixed by pressure with a separator interposed therebetween, and spirally winding to form a spiral electrode.

Insertion step: A step of inserting the spiral electrode into the negative electrode sheet by bringing the lead of the current collector into contact with the bottom surface of the battery container through the opening of the insulator.

Bottom welding step: A negative electrode sheet is collected by one of the spot welding welding electrodes inserted from the hole at the center of the spiral electrode and the other electrode rod abutting on the inner and outer bottom surfaces of the battery container. A step of spot welding the electric body to the inner bottom surface of the battery container.

[0007] Injection step: a step of injecting an electrolytic solution. Swelling part forming step: A step of forming a swelling part protruding in the centripetal direction using a roller mold near the opening of the battery container.

[0008] Sealing plate welding step: Cap-shaped terminal plate, PTC device, valve body, plate plate having a gas outlet from above in the inner peripheral portion of the insulating gasket in the bulge formed in the opening of the battery container A step of inserting and mounting a sealing member made of, and spot welding the current collector lead of the positive electrode sheet to the bottom surface of the dish plate.

[0009] Sealing step: a step of fitting the sealing member into the opening of the battery container, folding the opening inward, and sealing the opening through an insulating gasket.

Through the above steps, a battery having a spiral electrode is manufactured.

[0011]

In the conventional method of manufacturing a battery having a spiral electrode, there is a work content for performing spot welding in an electrode forming step, a bottom welding step, and a sealing plate welding step. In this case, there is a great possibility that sparks will be generated from the welding site during spot welding.

When the sparks come into contact with the separator material, if a battery with a hole is used, a short circuit occurs immediately and a defective product is generated when a battery is made with a microporous film such as polyethylene or polypropylene. Become.

Further, when sparks adhere to the surface of the valve body,
The safety device of the sealing plate may not function properly. Normally, the safety device has to be broken at relatively low pressure 10 to 30 kg / cm ^2. For this reason, the valve body is fixed by welding a metal foil of aluminum, nickel, nickel silver or the like having a thickness of several tens of microns to the upper surface of the plate by laser welding, high frequency welding, ultrasonic welding, or the like. However, when the metal oxide dissipated by the spark during welding adheres to the valve body, normal operation of the valve body is hindered.

When a laminated material having a pressure-sensitive / heat-sensitive adhesive composition disposed on at least one surface of a metal foil is used for the valve body, the valve body is fixed by pressurization / heating to form a plate plate. Since the opening is hermetically closed, sparks at the time of welding can very easily open a hole in the valve body, causing the electrolyte inside the battery to leak out of the battery.

On the other hand, there is a problem specific to the organic electrolyte battery. Generally, in order to improve the discharge characteristics of an organic electrolyte battery, there is a great tendency to use a low-boiling solvent having a low flash point as a solvent for an electrolytic solution. In this case, particularly in the sealing plate welding step, the electrolyte injected into the battery container in the liquid injection step exists in a free state near the opening of the battery container. For this reason, there is a danger that the spark is easily ignited by the solvent at the time of welding, and it has been necessary to make the production line a line filled with an inert gas such as an argon gas or a nitrogen gas. Further, when the spark adheres to the inside of the battery, the deposit is an oxide of a metal, which adversely affects the electromotive reaction of the battery and deteriorates the discharge characteristics and storage characteristics of the battery, which is not preferable.

For the purpose of solving such problems, the step of electrically connecting the current collectors of the positive and negative electrode plates to the battery container / sealing plate also serving as respective terminals by spot welding in the process is eliminated. There was an attempt.

For example, regarding the connection between the sealing member and the current collector, US Pat. No. 4,963,446 discloses a current collector made of a metal foil by removing the active material from the sealing plate contact surface of one of the spiral electrodes. Use a jig that is tilted in the inner diameter direction with a jig in the previous process of storing the exposed body in the battery container,
A configuration that realizes electrical connection between a sealing plate and an electrode without performing spot welding is described. Further, in U.S. Pat. No. 3,761,314, a current collector made of metal is exposed by removing an active material from a contact surface of a spiral electrode with a sealing plate of one electrode, and a slit is formed in a height direction in this portion. rear,
A configuration is disclosed in which a spiral electrode is formed, and the current collector portion is inclined in the inner diameter direction to realize electrical contact between the sealing plate and the spiral electrode without performing spot welding.

Further, as described in US Pat. No. 3,732,124, the active material is removed from the contact surface of one of the spiral electrodes with the sealing plate to expose the current collector made of metal, and a slot is formed in this portion. There is known a configuration in which electrical connection between a spiral electrode and a sealing plate is realized by using a cloth part with a seal.

However, in these configurations, the number of parts is increased, a slit needs to be carefully made, or the current collector exposed portion is inclined in the inner diameter direction before the soft spiral electrode is inserted into the battery container. It is not preferable in view of the necessity of a process and productivity. The present invention solves these problems, and provides a battery provided with a spiral electrode that is excellent in mass productivity and battery characteristics and is excellent in safety without generating a spark in a manufacturing process, and a method for manufacturing the battery. The purpose is to:

[0020]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sheet-like electrode plate in which a current collector made of a conductor is filled with a positive / negative active material in a battery container also serving as one electrode terminal. Is housed in a spiral shape via a separator, the opening of the battery container also serves as the other electrode terminal, the cap-shaped terminal plate, the PTC device, and the plate are electrically connected, and the valve body is By disposing a sealing member provided with a safety valve device having an insulating gasket via an insulating gasket, the opening of the battery container is folded inward and the battery is sealed by crimping, and the battery side of the plate plate constituting the sealing member The bottom surface portion is in contact with a portion where the active material of one sheet electrode filled with the positive / negative active material of the spiral electrode is removed and the current collector is exposed. The lead of the current collector of the sheet electrode is on the inner surface of the battery container. A bulging portion that is electrically connected and protrudes in the centripetal direction directly below the opening of the battery container, and the exposed portion of the current collector of the one sheet-like electrode is formed in a radial direction by a spacer made of an insulator. The projections provided on the plate are firmly pressed against each other.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention relates to a sheet-like electrode in which a current collector made of a conductor is filled with a positive / negative electrode active material in a battery container also serving as one electrode terminal. A battery in which a spiral electrode in which a plate is spirally wound via a separator is housed, and an opening of the battery container is sealed with a sealing member serving also as another electrode terminal provided with a safety device, wherein the sealing is performed. The member has a convex portion at its center,
A cap-shaped terminal plate provided with an opening in the upper or side surface thereof, a PTC device disposed below the cap-shaped terminal plate and provided with an opening in the center thereof, and a lower side of the PTC device. A plate provided with an opening at the center thereof and having a projection at the periphery thereof in contact with the PTC device; and a plate disposed between the plate and the PTC device, wherein the opening of the plate is provided. And a safety valve device having a valve body for opening the opening when the internal pressure of the battery rises abnormally, and the cap-shaped terminal plate is electrically connected to the PTC device and the plate plate. The battery-side bottom portion of the plate is
The cap-shaped terminal plate also serves as one electrode terminal by removing the active material of one sheet-like electrode filled with the positive / negative active material of the spiral electrode and abutting the exposed portion of the current collector. On the inner surface of the battery case, a lead portion of a current collector of the other electrode is electrically in contact with the inner surface of the battery case, the battery case also serves as the other electrode terminal, and the opening of the battery case is A bulging portion provided in a centripetal direction provided immediately below the bulging portion is formed, the sealing member is locked to the bulging portion, and the opening of the battery container is folded inward via an insulating gasket to form a swage. The current collector exposed portion of one of the spirally wound electrodes filled with the positive / negative electrode active material by the swollen portion is inclined and converged in the inner diameter direction by a spacer made of an insulator, and the projection provided on the plate plate Characterized by strong pressure contact of the part A battery having a wound electrode.

According to this configuration, it is possible to obtain a battery excellent in mass productivity and battery characteristics without generating a spark in the manufacturing process.

The invention described in claim 3 is the first invention.
Wherein the thickness of the battery container in the constituent caulking opening is made smaller than the thickness of the other parts. According to this configuration, the holding force of the sealing member can be increased.

In the present invention, the sealing member has a cap-shaped terminal plate having a convex portion at the center thereof and an opening formed on the upper surface or side surface thereof, and is disposed below the cap-shaped terminal plate. A PTC device which is provided with an opening at the center thereof;
A plate provided below the PTC device, having an opening in the center thereof, and having a protrusion at the periphery thereof in contact with the PTC device; and a plate disposed between the plate and the PTC device. While always closing the opening of the plate, and when the internal pressure of the battery abnormally rises, a safety valve device comprising a valve body having a function of opening the opening is arranged, and a cap-shaped terminal plate, The PTC device and the plate are configured to be electrically connected.

The PTC device protects the battery from excessive current and temperature. Its structure is such that when an excessive current or an excessive temperature rise occurs in the battery, the resistance value increases rapidly and the conductor is normally a conductor. The PTC element is a return-type plastic positive temperature coefficient thermistor that returns to a conductor when the battery returns to a normal state, and a terminal made of metal foil on both surfaces of the PTC element. To form a PTC device. Usually, the PTC device operates to protect the battery as a stage prior to the operation of the safety device.

The battery-side bottom surface of the plate is electrically connected to a current collector exposed portion of one of the spiral electrodes, and also serves as one electrode terminal. Also, a current collector lead of the other electrode is electrically connected to the inner surface of the battery container, the battery container also serves as the other electrode terminal, and the opening of the battery container is provided directly below. A bulging portion protruding in a centripetal direction is formed, the sealing member is locked to the bulging portion, and the opening of the battery container is folded inward through an insulating gasket to be crimped and sealed. A battery provided with a spiral electrode having a configuration in which the current collector portion of one electrode of the spiral electrode is inclined and converged in the inner diameter direction by a spacer made of an insulator by a portion, and a projection provided on the plate is pressed firmly. And

The invention according to claim 8 of the present invention is a method for manufacturing a battery provided with a spiral electrode, wherein a current collector electrically contacted with a sealing member in a battery container also serving as one electrode terminal. A sheet-like electrode plate filled with positive / negative electrode active material having a body exposed portion, and a sheet-like sheet filled with positive / negative electrode active material in which the lead portion of the current collector is electrically in contact with the inner surface of the battery container Spirally winding the electrode plate through a separator, and a sheet-like electrode filled with a positive / negative electrode active material having a current collector exposed portion for electrically contacting the spiral electrode with a sealing member A step of housing the plate upward in a direction in which the current collector lead portion of the electrode sheet filled with the other positive / negative active material is in contact with the inner surface of the battery container via a spacer made of an insulator disposed on the bottom surface of the battery container; A ring-shaped insulator is inserted and mounted on the outer periphery of the exposed portion of the current collector Forming a bulge protruding in the centripetal direction with a mold or jig such as a roller in the horizontal direction at the portion directly below the opening of the battery container, and simultaneously deforming the insulator by the bulge. A step of inclining and converging the exposed portion of the positive / negative current collector in the inner diameter direction, a step of injecting an electrolytic solution, and a bulge formed in the opening of the battery container. A cap-like terminal plate having a gas discharge port, a PTC device, a valve body, a cap-like terminal plate having a gas discharge port from above, on which a sealing member provided with a safety valve device configured by inserting a plate plate is placed or placed; A step of placing a sealing member configured by sequentially inserting these components in the order of the PTC device, the valve element, and the plate, and providing the opening portion of the battery container inward by folding the opening of the battery container in the plate of the sealing member. Of the positive / negative electrode It is made of a step of sealing the mouth via an insulating gasket to press-fit the body exposed portion.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings to facilitate understanding of the present invention. In this embodiment, an organic electrolyte battery, specifically, a lithium manganese dioxide battery of AA size (IEC standard AA size) will be described as an example of a battery provided with a spiral electrode. FIG. 1 is a longitudinal sectional view of a battery provided with a spiral electrode in the present embodiment.

Example 1 In FIG. 1, reference numeral 1 denotes an iron battery container having a thickness of 0.35 mm and also serving as a negative electrode terminal.
Inside thereof, a positive electrode active material-filled sheet in which a current collector 2 made of stainless steel foil is filled with a positive electrode active material 3 mainly composed of manganese dioxide, 4 is a negative electrode active material made of metallic lithium,
A negative electrode active material sheet formed by pressing a nickel foil having a lead portion 5b as a current collector 5; and winding these positive and negative electrode active material sheets through a separator 6 made of a microporous polyethylene film having a thickness of 20 to 27 microns. The electrode body A shown in FIG. 4 is configured by being spirally wound with a core (not shown). As shown in FIG. 2A, the positive electrode active material sheet of the electrode body A has a configuration in which the active material at one edge in the longitudinal direction is removed to form a portion 2a exposing the current collector. Alternatively, similarly, a current collector 2 having a shape such that the current collector exposed portion 2a does not exist in the outermost peripheral portion when wound as shown in FIG. 2B is used. As shown in FIG. 3, the negative electrode active material sheet has a shape having a portion 5a to be pressed against metallic lithium and a lead portion 5b projecting out of metallic lithium as shown in FIG. FIG. 5 shows a partial shape of the current collector exposed portion of the positive and negative electrode active material sheets of the electrode body A. As can be seen from FIG. 5, the width D1 of the separator 6, the width D2 of the positive electrode active material, and the width D3 of the negative electrode active material have a relationship expressed by D1>D2> D3, where the electrode width is smaller than the separator width. The inside is designed so that one electrode width is smaller than the other so that a short circuit phenomenon does not occur inside.

B is a sealing member having a safety device for closing the opening of the battery container 1 and also serving as the other electrode terminal. The sealing member has a projection at the center and an opening 7 at the top or side surface thereof.
a is provided with a cap-shaped terminal plate 7 made of a SUS material having a thickness of 0.35 mm, and an opening 8a is provided at the center of the terminal under the cap-shaped terminal plate 7 and has a thickness of 250 μm (a nickel foil PTC device 8 having a total thickness of 40 microns and a PTC element thickness of 210 microns).
6A and 6B, an opening 9a is provided at the center thereof, and a wedge-shaped projection 9C protruding downward formed by the opening is provided. A plate 9 made of a SUS material having a thickness of 0.3 mm and having a protruding portion 9b abutting on the PTC device 8 on its peripheral portion, and the plate 9 and the PT
The opening 9a of the plate 9 which is arranged between the C devices 8
Is always closed.

When the internal pressure of the battery rises to 10 to 30 kg / cm ² , the valve body 10 made of a composite material obtained by laminating an aluminum foil having a function of opening the opening 9 a and a resin film is thermally bonded. The cap-shaped terminal plate 7, the PTC device 8, and the plate 9
Was electrically connected.

The bottom surface of the plate 9 on the battery side is electrically connected to a portion 2a of the spiral electrode A where the active material of the positive electrode active material sheet is removed to expose the current collector 2, so that the cap-shaped terminal is formed. The plate also serves as a positive electrode terminal, and the lead portion 5b of the current collector 5 of the negative electrode active material sheet abuts on the inner surface of the battery container, and the battery container also serves as a negative electrode terminal.

Further, the opening of the battery container is crimp-sealed by folding the opening 1a of the battery container 1 inward with the sealing member B via the insulating gasket 11, and the battery container of the crimp-sealing portion is closed. The width of the horizontal part supporting the insulating gasket 11 protruding in the centripetal direction from the part directly below has a width of about 0.5 mm.
A bulging portion 1b having a diameter of 7 mm is formed, and the bulging portion causes the current collector exposed portion 2a of the positive electrode active material sheet of the spiral electrode to be inclined and converged in the inner diameter direction by a spacer 12 made of insulating synthetic resin. The projections 9b provided on the plate 9 are firmly pressed against each other.

Reference numeral 13 denotes a spacer made of an insulating material such as a synthetic resin disposed on the bottom of the electrode body A. The lead 5b of the current collector 5 of the negative electrode active material sheet contacts the inner surface of the battery case 1 via this spacer. It has a structure. As the electrolyte, a solute concentration of 1 Mol / l was added to an organic solvent composed of an equal volume mixture of dimethoxyethane having a boiling point of 85 ° C. and a flash point of 1.1 ° C. and a boiling point of 242 ° C. and a flash point of 135 ° C. The electrolytic solution in which lithium tetrafluorosulfonate is dissolved so as to have a concentration of is used.

Next, a method for manufacturing a battery provided with a spiral electrode in Example 1 will be described. Step 1: A sealing member B is provided in the battery container 1 also serving as the positive electrode terminal.
A positive electrode active material sheet filled with a positive electrode active material 3 having a current collector exposed portion 2a electrically contacted with the current collector 5 and a current collector 5 provided with a current collector lead 5b contacted with the inner surface of the battery container The negative electrode active material sheet is pressed in such a manner that the current collector exposed portion 2a of the positive electrode active material sheet is placed upward with the separator 6 interposed therebetween, and the current collector lead portion 5b of the negative electrode active material sheet is placed downward. The step of winding.

Step 2: The spiral electrode A is positioned so that the positive electrode active material sheet provided with the current collector exposed portion 2a to be in contact with the sealing member B faces upward, and the current collector lead of the negative electrode active material sheet A step of folding and housing the portion 5b so as to be in contact with the outer peripheral surface of the electrode body A via the spacer 13.

Step 3: A step of inserting and placing a ring-shaped spacer 12 made of an insulator on the outer peripheral portion of the current collector exposed portion 2a of the positive electrode active material sheet.

Step 4: Immediately below the opening of the battery container 1, a swelling portion 1b having a horizontal portion protruding in the centripetal direction of about 0.7 mm is formed by a roller mold. A step of deforming the insulator 12 into an inverted trapezoidal shape to converge the collector exposed portion 2a of the positive electrode active material sheet in the radial direction.

Step 5: Injecting the electrolyte. Step 6: Next, the insulating gasket 11 is inserted and placed in the bulging portion 1b formed in the opening of the battery container, and the cap-shaped terminal plate 7 having the gas discharge port 7a from above on the inner peripheral portion of the insulating gasket; A ring-shaped PTC device 8 having an opening 8a, and a projection 9 which abuts on the current collector exposed portion 2a of the positive electrode plate.
b, an opening 9 formed by providing the projection 9b
a, a plate 9 on which a valve body 10 for constantly closing an opening 9a is arranged
A step of sequentially inserting and placing the sealing member B composed of (the sealing member B may be assembled in advance in this step).

Step 7: The opening of the battery container 1 is folded inward, and the projection 9a provided on the plate 9 of the sealing member B is firmly pressed into the current collector exposed portion 2a of the positive electrode active material sheet. The sealing port through the insulating gasket 11 as described above.

A battery provided with a spiral electrode is manufactured by the above steps 1 to 7. Incidentally, in the step of bending the negative electrode current collector lead portion via the spacer in the step 2, it is not necessary to intervene the spacer.

Next, the manufacturing method in Example 1 and the conventional manufacturing method, that is, a manufacturing method of electrically connecting the current collectors of the positive and negative electrode plates by spot welding are applied.
Batteries obtained by manufacturing 5 lots with 3,000 pieces per lot were regarded as batteries according to Example 1 and Conventional Example 1, respectively. For each battery, the battery voltage defect rate due to the breakage of the separator at the time of production, the electrolyte leakage defect rate due to the valve body breakage, and the number of productions per minute were compared. The results are shown in (Table 1).

[0043]

[Table 1]

As is clear from Table 1, the device according to the present invention can greatly increase the production speed as compared with the conventional method, and can remarkably improve the voltage defect rate.

In the first embodiment, an iron material having a thickness of 0.35 mm was used as the material of the battery container 1.
It is preferable to use a metal plate of 0.7 mm made of any of iron, aluminum, SUS, and a metal mainly composed of these.

(Example 2) As Example 2, a battery having a spiral electrode using a battery container in which the thickness of the battery container in the swaged sealing portion was smaller than the thickness of the other portions was formed. The spiral electrode, the sealing plate, and the electrolyte have the same configuration as in Example 1, and a detailed description is omitted.

The opening of the battery case is crimp-sealed by folding the opening 1a of the battery case 1 inward with the sealing member B via the insulating gasket 11, and the thickness of the battery case 1 at the crimp-sealing portion is different. The thickness of the insulating gasket 1 protrudes in the centripetal direction at the portion immediately below the portion where the thickness is reduced, while the thickness of the portion is reduced to 0.2 mm with respect to 0.35 mm.
A bulge portion 1b having a width of about 0.7 mm exists in a horizontal portion that supports the current collector 1, and the bulge portion allows the current collector exposed portion 2a of the positive electrode active material sheet of the spiral electrode to be formed of an insulating material such as a synthetic resin. The projections 9b provided on the plate 9 are firmly pressed against each other by being inclined and converged in the inner diameter direction by a spacer 12 made of. The spacer 13 made of an insulating material such as a synthetic resin disposed on the bottom of the electrode body A is
The structure is the same as that of the first embodiment in which the lead portion 5b of the current collector 5 of the negative electrode active material sheet is brought into contact with the inner surface of the battery case 1.

Next, a method for manufacturing a battery provided with a spiral electrode in Example 2 will be described. The manufacturing method according to the second embodiment differs from the manufacturing method according to the first embodiment in each step of the manufacturing method.
, And steps 1 to 3 and steps 5 to 7 are the same. In the second embodiment, only differences will be described. Step 4 in the example is as follows. That is, step 4: the opening of the battery container 1 is pushed into the opening so that the wall thickness of the opening is 0.35 mm by 0.1 from the other portions.
5 mm thin 0.2 mm, and a horizontal part protruding in the centripetal direction is about 0.7 m directly below the part where the thickness is reduced.
m, and simultaneously with the formation of the bulging portion 1b, the bulging portion 1b deforms the insulator 12 into an inverted trapezoidal shape so that the current collector exposed portion 2a of the positive electrode active material sheet is inclined and converged in the radial direction. .

Next, in the same manner as in the first embodiment, the battery is manufactured in one lot 300 by the manufacturing method according to the second embodiment and the conventional manufacturing method.
Five lots were manufactured as zero. As in the case of the second embodiment, the thickness of the battery container at the swaged sealing portion is smaller than the thickness of the other portions, and the obtained battery is referred to as Conventional Example 2. At this time, the defect rate of the battery voltage caused by the breakage of the separator, the leak rate of the electrolyte solution caused by the breakage of the valve body, and the number of productions per minute were compared. The results are shown in (Table 2).

[0050]

[Table 2]

As is clear from Table 2, the production speed of the present invention is 18 to 34% higher than that of the conventional method in production speed.
The speed can be increased, and the voltage defect rate can be significantly improved.

In the second embodiment, the thickness of the thin portion of the battery container 1 is 57% (= (0.2 mm / 0.
35 mm) * 100), but the same can be implemented within the range of 15 to 70%. If it is less than 15%, the mechanical strength and rigidity of the battery container are insufficient, and the sealing member cannot be fixed airtightly. On the other hand, if it exceeds 70%, the width of the horizontal portion in the bulging portion for supporting the gasket is insufficient, so that the sealing member cannot be uniformly supported, resulting in poor sealing airtightness and leakage of the electrolyte, which is not preferable.

(Example 3) In Example 3, a flexible synthetic resin was used in place of the synthetic resin in Example 1 for the spacer for inclining and converging the current collector exposed portion of one electrode in the inner diameter direction. It was what was. Other components such as a spiral electrode, a battery container, a sealing plate, and an electrolyte are the same as those of the first embodiment.
And the detailed description is omitted.

In the third embodiment, the bulging portion formed in the battery container is the current collector exposed portion 2 of the positive electrode active material sheet of the spiral electrode.
a is inclined and converged in the inner diameter direction by a spacer 12 made of a flexible insulator made of urethane foam resin, so that a projection 9b provided on the plate 9 is firmly pressed against the plate. Further, the spacer 13 is provided in the first embodiment.
Similarly to the above, the lead 5 of the current collector 5 of the negative electrode active material sheet is made of an insulating material such as a synthetic resin disposed on the bottom of the electrode body A.
b has a structure in which it comes into contact with the inner surface of the battery container 1 via this spacer.

The material of the spacer made of a flexible resin may be a foamed resin made of silicone resin or epoxy resin, butyl rubber, nitrile rubber, or the like.
Rubber materials having organic solvent resistance, such as fluororubber and ethylene-vinyl acetate copolymer elastomer, are effective.

Next, a method of manufacturing a battery provided with a spiral electrode in Example 3 will be described. The manufacturing method according to the third embodiment is different from the manufacturing method according to the first embodiment in each step of the manufacturing method.
Only in using a resin having flexibility.

Next, five lots of the battery manufactured by the manufacturing method according to the third embodiment and the conventional manufacturing method were manufactured with 3,000 batteries per lot. The conventional product in the third embodiment is
A flexible resin is used for the spacer located above the electrode, and the obtained battery is referred to as Conventional Example 3.

For each battery, the battery voltage defect rate caused by separator breakage, the electrolyte leak rate caused by valve body damage, and the number of productions per minute were compared (Table 3). ).

[0059]

[Table 3]

As is clear from Table 3, the device according to the present invention can significantly increase the production speed as compared with the conventional method, and can remarkably improve the voltage defect rate.

[0061]

As described above, according to the present invention, it is possible to obtain a battery provided with a spiral electrode which is excellent in mass productivity and battery characteristics and excellent in safety without generating a spark in the manufacturing process.

Although a cylindrical lithium manganese dioxide battery has been described as the present embodiment, a lithium hooker graphite battery constructed using a spiral electrode body as in the present invention,
Primary and secondary organic electrolyte batteries using non-aqueous electrolytes that use metal oxides, halides, sulfides, etc. as the positive electrode active material, such as ion lithium storage batteries, alkaline manganese dry batteries, silver oxide batteries, nickel hydrogen storage batteries, etc. It can be applied to any of primary and secondary alkaline batteries using a metal oxide, a halide, a sulfide or the like as a positive electrode active material and using an alkaline electrolyte. In the embodiment, the shape of the battery container is shown as a cylindrical shape. However, other shapes, specifically, oval (oval), square, and elliptical shapes are similarly effective. It is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a battery having a spiral electrode according to an embodiment of the present invention.

FIG. 2A is a front view of a positive electrode active material sheet showing an example of the present invention. FIG. 2B is a front view of another shape of the positive electrode active material sheet showing an example of the present invention.

FIG. 3 is a front view of a negative electrode active material sheet showing an example of the present invention.

FIG. 4 is a sectional view of a spiral electrode body showing an embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a spiral electrode body showing an embodiment of the present invention.

6A is a plan view of a plate showing an embodiment of the present invention. FIG. 6B is a cross-sectional view taken along line AA of the plate shown in FIG. 6A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery container 2 Positive electrode collector 3 Positive electrode active material 4 Negative electrode active material 5 Negative electrode collector 6 Separator 7 Cap-shaped terminal plate 8 PTC device 9 Dish plate 10 Valve body (safety device) 11 Insulating gasket 12 Spacer (upper part) 13 Spacer (lower part) A Spiral electrode body B Sealing member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiya Kuwamura 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. CC16 CC19 CC21 EE00 EE01 5H024 AA03 AA12 BB03 BB05 BB08 BB09 CC02 CC06 CC07 CC12 DD01 DD02 DD03 DD12 DD15 EE00 EE01 HH13 HH15 5H028 AA01 AA05 AA07 BB01 BB02 BB03 BB04 CB07 CC05 CC07 CC08 CC08

Claims (8)

[Claims] 1. A battery container serving also as one electrode terminal,
A current collector made of a conductor is filled with a positive / negative active material, and a spiral electrode is wound around a sheet-like electrode plate via a separator. The opening of the battery container is provided with a safety device. A battery that is sealed with a sealing member also serving as the other electrode terminal, wherein the sealing member has a convex portion at a central portion thereof, and a cap-shaped terminal plate provided with an opening at an upper surface or a side surface thereof. When,
A PTC device arranged below the cap-shaped terminal plate and having an opening at the center thereof; and a PTC device arranged below the PTC device and having an opening at the center and a peripheral portion thereof. A plate having a projection abutting on the plate; and a plate disposed between the plate and the PTC device, wherein the hole in the plate is always closed and the hole is formed when the internal pressure of the battery rises abnormally. A safety valve device having a valve body for opening the valve is disposed, the cap-shaped terminal plate is electrically connected to the PTC device and the plate, and the bottom of the plate on the battery side is connected to the positive / negative electrode of the spiral electrode. The cap-shaped terminal plate also serves as one electrode terminal by removing the active material of the one sheet-shaped electrode filled with the active material and abutting the exposed portion of the current collector, and also on the inner surface of the battery container. Indicates that the current collector lead of the other electrode is To the contact, the battery case also serves as the other electrode terminal, The opening of the battery container to form a bulged portion protruding centripetal direction provided on the portion directly under,
The opening portion of the battery container is closed inward by folding the opening portion of the battery container inward through an insulating gasket with the sealing member locked to the bulging portion, and the bulging portion is filled with the positive / negative active material of the spiral electrode. The exposed portion of the current collector of one of the electrodes was inclined and converged in the inner diameter direction by a spacer made of an insulator,
A battery provided with a spiral electrode, wherein a projection provided on the plate is firmly pressed against the battery. 2. The battery provided with a spiral electrode according to claim 1, wherein the battery container is selected from iron, aluminum, stainless steel, and a metal material mainly composed of these. 3. A spiral electrode in which a sheet-like electrode plate in which a current collector made of a conductive material is filled with a positive / negative active material is spirally wound through a separator in a battery container also serving as one electrode terminal. A battery that seals the opening of the battery container with a sealing member also serving as the other electrode terminal provided with a safety device, wherein the sealing member has a convex portion at the center thereof, and A cap-shaped terminal plate provided with an opening on the upper surface or side surface thereof, a PTC device disposed below the cap-shaped terminal plate and provided with an opening in the center thereof,
A plate provided below the TC device, provided with an opening at the center thereof, and having a projection at the periphery thereof in contact with the PTC device; and a plate disposed between the plate and the PTC device. A safety valve device having a valve body for opening the opening portion when the internal pressure of the battery rises abnormally while the opening of the plate plate is always closed and the internal pressure of the battery rises abnormally is arranged. The plate is configured to be electrically connected, and the battery-side bottom portion of the plate plate removes the active material of one of the sheet-like electrodes filled with the positive / negative active material of the spiral electrode to form a current collector. By contacting the exposed portion, the cap-shaped terminal plate also serves as one electrode terminal, and the lead portion of the current collector of the other electrode electrically contacts the inner surface of the battery container on the inner surface of the battery container. The battery case also serves as the other electrode terminal, and The opening of the container is caulked by folding the opening of the battery container inward through the insulating gasket through the insulating gasket, and the thickness of the battery container of the caulking opening is made thinner than other portions. A bulging portion for supporting the insulating gasket protruding in the centripetal direction is formed immediately below the portion where the thickness is reduced, and the bulging portion is used to fill the positive / negative electrode active material of the spiral electrode with one side A battery provided with a spiral electrode, wherein a current collector exposed portion of the electrode is inclined and converged in an inner diameter direction by a spacer made of an insulator, and a projection provided on the plate is firmly pressed against the electrode. 4. A battery provided with a spiral electrode according to claim 3, wherein the thickness of the opening of the battery container is reduced by 15 to 60% from the other portions by indentation. 5. A battery provided with a spiral electrode according to claim 3, wherein the thickness of the battery container is 0.15 to 0.7 mm. 6. An electrode terminal, wherein the thickness of the opening is thinner than that of the other portion, and a bulging portion protruding in the centripetal direction is formed immediately below the portion where the thickness is reduced. In a battery container, a spiral electrode in which a sheet-like electrode plate in which a current collector made of a conductor is filled with positive / negative electrode active materials is spirally wound through a separator, and an opening of the battery container is provided. A battery that locks a sealing member also serving as the other electrode terminal provided with a safety device at the upper part of the bulging portion provided at the upper portion and seals the opening of the battery container, wherein the sealing member is convex at the center thereof. A cap-like terminal plate having an opening on the top or side surface thereof, a PTC device disposed below the cap-like terminal plate and having an opening in the center thereof, It is located below the PTC device and has an opening at the center. A dish plate having a protruding portion that contacts the PTC device at a peripheral portion thereof, and a plate plate disposed between the plate plate and the PTC device and always closing an opening of the dish plate and abnormally increasing the internal pressure of the battery. When ascending, a safety valve device having a valve body that opens the opening is disposed, and the cap-shaped terminal plate, the PTC device, and the plate are electrically connected to each other. The bottom surface portion is in contact with a portion where the active material of one of the sheet electrodes filled with the positive / negative electrode active material of the spiral electrode is removed to expose the current collector,
Therefore, the cap-shaped terminal plate also serves as one electrode terminal, and the lead of the current collector of the other electrode is electrically in contact with the inner surface of the battery container on the inner surface of the battery container, and the battery container is connected to the other electrode. Also serving as a terminal, the opening of the battery container is sealed by caulking the opening of the battery container inward by folding the opening of the battery member through an insulating gasket, and one of the electrodes filled with the positive / negative electrode active material. A battery provided with a spiral electrode, wherein an exposed portion of the current collector is converged in an inner diameter direction by a spacer made of a flexible insulator, and a projection provided on the plate is firmly pressed against the electrode. 7. A battery provided with a spiral electrode according to claim 6, wherein the spacer made of a flexible insulator is a foamed resin or a rubber material. 8. A spiral electrode in which a sheet-like electrode plate in which a current collector made of a conductor is filled with a positive / negative active material is spirally wound through a separator in a battery container also serving as one electrode terminal. A method of manufacturing a battery including a spiral electrode provided with a safety valve device in a sealing member for sealing a battery opening, wherein the sealing member is electrically in contact with the sealing member in a battery container also serving as one electrode terminal. A sheet-like electrode plate filled with positive / negative active material having a current collector exposed portion, and a positive / negative active material in which the lead portion of the current collector is electrically contacted with the inner surface of the battery container Spirally winding the formed sheet-shaped electrode plate through a separator, and a sheet filled with a positive / negative electrode active material provided with a current collector exposed portion for electrically contacting the spiral electrode with a sealing member. Electrode filled with the other positive / negative active material Receiving the current collector lead portion of the battery in a direction in which the current collector lead portion contacts the inner surface of the battery container via a spacer formed of an insulator disposed on the bottom surface of the battery container; The step of inserting and placing a bulge portion that protrudes in the centripetal direction with a mold or jig such as a roller in the horizontal direction at the portion directly below the opening of the battery container, and at the same time, the bulge portion removes the insulator. Deforming the exposed portion of the positive / negative current collector so as to incline and converge the exposed portion of the positive / negative current collector in the inner diameter direction; injecting the electrolyte solution; A cap-shaped terminal plate having a gas discharge port from above, a PTC device, a valve body, and a sealing member provided with a safety valve device configured by inserting a plate plate are inserted / cap-shaped with a gas discharge port from above. Terminal board, P
A step of placing a sealing member that is sequentially inserted in the order of the TC device, the valve element, and the plate, and mounting the projection provided on the plate of the sealing member by folding an opening of the battery container inward. A method of manufacturing a battery provided with a spiral electrode, comprising the step of: sealing a hole through an insulating gasket so as to press-fit the exposed portion of the positive / negative current collector firmly.