JP2002093388A - Battery and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To insert a sealer at an exact position of an outer package can through a gasket. SOLUTION: The battery is provided with an electrode 1 with a separator 1C arranged between an anode plate 1A and a cathode plate 1B, an outer package can 2 housing the electrode 1, and the sealer 3 occluding the opening of the outer package can 2 airtight through a gasket 4. The gasket 4 is equipped with a positioning locking protrusion specifying insertion depth into the outer package can 2, locked at its opening end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery in which an opening of an outer can is caulked and a sealing body is hermetically sealed, and a method of manufacturing the battery.

[0002]

2. Description of the Related Art A battery is manufactured by filling an electrode body and an electrolytic solution into a cylindrical outer can closing the bottom, and then fixing the sealing body at the opening to hermetically close the opening. The structure that seals the outer can with the sealing body is a structure in which a nylon gasket is sandwiched between the sealing body and the outer can by air-tightening by caulking processing, and the boundary between the sealing body and the outer can is laser-welded. And hermetically sealed. The present invention relates to a battery for fixing a sealing body to an outer can by caulking the outer can. A conventional battery having this structure is manufactured in the process shown in FIG. 1 as follows.

(1) The positive electrode plate 1A and the negative electrode plate 1B are laminated via a separator 1C, and the wound electrode body 1 is inserted into an outer can 2 having a closed bottom. After the electrode body 1 is placed, the insulating separator 9 is placed on the upper surface of the electrode body 1. The insulating separator 9 is disposed on the upper surface of the outer peripheral portion of the electrode body 1 in order to prevent the peripheral wall 6 of the outer can 2 from coming into contact with the electrode body 1 and causing an internal short circuit. (2) The outer wall 2 is provided by grooving the outer can 2 from the outer peripheral surface. The peripheral wall 6 is provided at a boundary between the electrode body 1 and the sealing body 3 and serves as a stopper for preventing the sealing body 3 from being pushed into the outer can 2. (3) The electrolytic solution is injected into the outer can 2 and permeates the electrode body 1. (4) The lead 12 connected to the electrode body 1 is connected to the sealing body 3 by spot welding. (5) After setting the sealing body 3 in the opening of the outer can 2, the opening edge of the outer can 2 is bent inward into an L-shape, and the L-shaped bent portion 1 is formed.
The sealing body 3 is sandwiched between the peripheral wall 3 and the peripheral wall 6 and fixed. In this state, the sealing body 3 is sandwiched via the gasket 4. The gasket 4 fixes the sealing body 3 in an airtight manner and insulates the sealing body 3 from the outer can 2. Therefore, the gasket 4 is made of an insulating material that is a rubber-like elastic body. (6) Finally, as shown by the arrow, the L-shaped bent portion 13 is pressed from above, and the gasket 4 is securely sandwiched between the L-shaped bent portion 13 and the peripheral wall 6 to be in an airtight state. . In this process,
The peripheral wall 6 is also crushed and comes into contact with the upper surface of the electrode body 1. Since the insulating separator 9 is provided between the peripheral wall 6 and the electrode body 1, the electrode body 1 does not contact the peripheral wall 6 of the outer can 2 and short-circuit.

[0004]

In the battery manufactured by the above-described process, the depth at which the sealing body is inserted into the outer can is specified by the peripheral wall. However, with this structure, it is difficult to specify the depth at which the sealing body is inserted with high accuracy. This is because the upper surface of the peripheral wall provided by grooving the outer can becomes an inclined surface, and furthermore, the sealing body is fixed at a fixed position via an elastically deformable gasket. It is extremely important to put the sealing body at the correct position on the outer can, since the external dimensions of the battery can be mass-produced with high accuracy. If the position where the sealing body is put into the outer can shifts, not only the error in the outer dimensions increases, but also the relative position between the sealing body and other parts shifts, which causes a reduction in yield.

Further, in a battery in which the sealing body is fixed at a fixed position by a stopper ridge without providing a peripheral wall, it is more difficult to mount the sealing body at an accurate position on the outer can. In the battery having this structure, as shown in the cross-sectional view of FIG. 2, a stopper ridge 5 is provided along the outer peripheral surface of the gasket 4 instead of the peripheral wall. The stopper ridge 5 is provided so as to protrude from the inner surface of the outer can 2, and the stopper ridge 5 and the outer peripheral edge of the sealing body 3 sandwich the gasket 4 to hermetically close the opening of the outer can 2. Since the battery of this structure has no peripheral wall,
The electrode body 1 can be extended as high as the space where the peripheral wall is provided.
Therefore, there is a feature that the charging capacity can be increased. However,
A battery having this structure is provided with a gasket 4 on an outer can 2 having no peripheral wall.
Is inserted, it is more difficult to accurately specify the position where the sealing body 3 is to be inserted.

SUMMARY OF THE INVENTION The present invention has been developed to solve such disadvantages. An important object of the present invention is to provide a battery capable of inserting a sealing body into a precise position of an outer can via a gasket. It is to provide a manufacturing method thereof.

[0007]

The battery according to the present invention comprises an electrode body 1 having a separator 1C disposed between a positive electrode plate 1A and a negative electrode plate 1B, and an outer can housing the electrode body 1 therein. 2
And a sealing body 3 hermetically closing the opening of the outer can 2 via a gasket 4. Gasket 4
It has a positioning locking projection 7 that is locked to the open end of the outer can 2 and specifies the insertion depth into the outer can 2.

[0008] In the battery of the present invention, preferably, the positioning locking projection 7 is formed as a projection that contacts the entire open end or a plurality of locations of the open end of the outer can 2. Further, in the battery of the present invention, the open end of the outer can 2 that locks the positioning locking projection 7 is bent along the surface of the sealing body 3, and the bent L-shaped bent portion is formed. At 13, the upper surface of the sealing body 3 is pressed via the gasket 4. The positioning locking projection 7 has a projection amount substantially equal to the thickness of the outer can 2, so that the top surface of the positioning locking projection 7 and the surface of the outer can 2 can be positioned on substantially the same plane. .

Further, in the battery of the present invention, a stopper ridge 5 is provided on the inner surface of the outer can 2 so as to protrude along the outer peripheral surface of the gasket 4, and the stopper ridge 5 and the outer peripheral edge of the sealing body 3 4 can be pinched.

The stopper ridge 5 is cut into the outer peripheral surface of the gasket 4 to form an outer peripheral groove 14 in the outer peripheral surface of the gasket 4, and the stopper ridge 5 is fitted into the outer peripheral groove 14 to cover the sealing body 3. It can be fixed to the can 2. The stopper ridge 5 can be provided on the inner surface of the outer can 2 by bending the outer can 2 so that a groove 15 is formed on the outer surface. The stopper ridge 5 can also be formed so that the outer can 2 is formed thick along the sealing body 3 and protrudes from the inner surface. Further, the battery of the present invention may have a structure in which a peripheral wall protruding inside the outer can 2 is not provided between the sealing body 3 and the electrode body 1.

In the method for manufacturing a battery according to the present invention, the gasket 4 having the positioning locking projection 7 which is locked to the open end of the outer can 2 and specifies the insertion depth into the outer can 2 is connected to the outer can 2. Then, the open end of the outer can 2 is bent along the surface of the sealing body 3 and the gasket 4 is pressed against the upper surface of the sealing body 3 by the bent L-shaped bent portion 13. I do.

The method for manufacturing a battery according to the present invention includes the gasket 4
A stopper ridge 5 is provided on the inner surface of the outer can 2 so as to protrude along the outer peripheral surface of the outer can 2, and the stopper 3 can be fixed via the gasket 4 with the stopper ridge 5. According to this manufacturing method, the sealing body 3 can be fixed via the gasket 4 with the stopper ridges 5 without providing a peripheral wall projecting inside the outer can 2 between the sealing body 3 and the electrode body 1.

Further, in the battery manufacturing method of the present invention, a peripheral wall 6 protruding inside the outer can 2 is provided between the sealing body 3 and the electrode body 1, and the gasket 4 is formed by the peripheral wall 6 and the L-shaped bent portion 13. The sealing body 3 can also be mounted in a fixed position via.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a battery for embodying the technical idea of the present invention and a manufacturing method thereof, and the present invention does not specify the battery and the manufacturing method as follows.

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.

The battery shown in FIGS. 3 to 5 has a positive electrode plate 1A.
And a negative electrode plate 1B, an electrode body 1 in which a separator 1C is disposed, an outer can 2 housing the electrode body 1, and an opening of the outer can 2 airtightly via a gasket 4. And a closed sealing body 3. In these batteries, the sealing body 3 is fixed by caulking the outer can 2. In the battery of FIG. 3, the sealing body 3 is fixed by the stopper ridge 5 without providing a peripheral wall between the sealing body 3 and the electrode body 1, and the battery of FIG. A peripheral wall 6 is provided between them,
Further, in the battery shown in FIG. 5, a peripheral wall 6 is provided between the sealing body 3 and the electrode body 1, and the sealing body 3 is fixed by the stopper ridge 5. The batteries in these figures are secondary batteries such as nickel-hydrogen batteries, nickel-cadmium batteries, and lithium-ion secondary batteries.

When the battery is a nickel-hydrogen battery, an electrode plate having a core coated with an active material mainly composed of a hydrogen storage alloy is used as a negative electrode plate, and a slurry is coated on a nickel core body with a positive electrode plate. An electrode plate which is impregnated with an active material mainly composed of nickel hydroxide and rolled is used. The positive electrode plate and the negative electrode plate are laminated and wound via a separator made of a nonwoven fabric made of polypropylene to form an electrode body. As the electrolyte, a potassium hydroxide-based electrolyte is used.

When the battery is a nickel-cadmium battery,
For the negative electrode plate, a band-shaped non-sintered negative electrode plate in which a paste active material containing cadmium oxide as a main component is filled in a core of the electrode plate is used. An electrode plate rolled by impregnation with an active material mainly composed of nickel oxide is used. However, the electrode plate can also be manufactured by a sintering method. This electrode plate is a nickel porous sintered substrate obtained by sintering a perforated thin steel sheet coated with a slurry containing an organic thickener in a reducing atmosphere and filling it with cadmium by chemical or electrolytic impregnation. A plate or a positive electrode plate filled with nickel. The positive electrode plate and the negative electrode plate are laminated and wound via a separator made of a nonwoven fabric made of polypropylene to form an electrode body. As the electrolyte, an electrolyte containing potassium hydroxide as a main component is used.

When the battery is a lithium ion secondary battery, a positive electrode plate is provided with a positive electrode active material which is a lithium-containing composite oxide,
For example, a positive electrode slurry containing LiCoO ₂ as a main component is rolled by applying a positive electrode slurry to a core, and a negative electrode plate is provided with a negative electrode active material which is a carbonaceous material that occludes and releases lithium ions. An electrode plate is used in which a negative electrode slurry containing graphite powder as a main component is applied to a core and rolled. The positive electrode plate and the negative electrode plate are laminated and wound via a separator, which is a microporous polyethylene film, to form an electrode body. As the electrolytic solution, a solution in which a lithium salt is dissolved as an electrolyte in a non-aqueous aprotic organic solvent is used.

In the battery shown in the figure, a positive electrode plate 1A and a negative electrode plate 1B laminated on each other with a separator 1C interposed therebetween are wound. The spiral electrode body 1 is inserted into a cylindrical outer can 2. The spiral electrode body may be pressed from both sides to be deformed into an elliptical shape, and inserted into an elliptical or square outer can. Further, the electrode body to be inserted into the rectangular cylindrical outer can is manufactured by alternately laminating a plurality of positive and negative plates cut into a plate shape with polar plates having different polarities via a separator. Can also.

The outer can 2 is formed by processing a metal plate into a cylindrical shape having a closed bottom. The metal plate used for the outer can 2 is made of a material obtained by plating the surface of iron with nickel or the like, aluminum, an aluminum alloy, a clad material in which a plurality of metals are laminated, or the like. The outer can 2 having a closed bottom is manufactured by pressing a metal plate.

The outer can 2 used for the batteries of FIGS.
Stopper ridge 5 for holding gasket 4 on inner surface of opening
Are provided to protrude. As shown in the sectional views of FIGS. 6 and 7, the outer can 2 shown in FIG. 3 is airtightly closed by the sealing body 3 through the gasket 4 after the electrode body 1 is put in the outer can 2. You. Thereafter, the outside of the outer can 2 is pressed linearly to form the groove 15, and the stopper ridge 5 is provided along the outer peripheral surface of the gasket 4. The outer can shown in FIG. 5 is provided with a peripheral wall 6 by grooving processing in which the outer can 2 is linearly pressed from the outside after the electrode body 1 is inserted, and then the opening of the outer can 2 is inserted through the gasket 4. The outside of the outer can 2 is pressed linearly to form a groove 15, and a stopper ridge 5 is provided along the outer peripheral surface of the gasket 4. In these structures, the stopper ridge 5 does not protrude from the inner surface of the outer can 2 when the electrode body 1 is inserted.
The electrode body 1 can be inserted smoothly.

Further, as shown in FIG. 9, the outer can 2
In the step of manufacturing by processing a metal plate, an outer peripheral ridge 16 is provided so as to protrude outside the outer can 2, and after the electrode body 1 is put in the outer can 2, the outer side of the outer can 2 is pressed. In addition, the stopper ridge 5 protruding from the inner surface with the pushed outer ridge 16 can be provided. The outer can 2 can be formed to have a groove-free surface in a state where the protruding stopper ridges 5 are provided on the inner surface.

However, as shown in FIGS. 10 to 12, the outer can 2 is provided with a stopper on the inner surface of the opening in advance in the step of manufacturing the outer can 2, that is, before the step of inserting the electrode body 1. The protruding ridges 5 can be provided to protrude.
The stopper ridge 5 is provided by thickening a part of the outer can 2 as shown in FIGS. 10 and 11, or by pressing the outer can 2 linearly from the outside as shown in FIG. It is also possible to provide a stopper ridge 5 which is bent to protrude from the inner surface so that a groove 15 is formed.

The stopper ridges 5 are shown in FIGS.
As shown in FIG. 2, the shape of the cross section is mountain-shaped and the tip edge is pointed, or as shown in FIGS. 3 and 11, the tip edge is planar. The stopper ridge 5 of the chevron is shown in FIG.
As shown in the enlarged sectional view of FIG. 5, the sealing body 3 can be firmly fixed by biting into the gasket 4. Further, as shown in the enlarged cross-sectional view of FIG. 14, the stopper ridge 5 having a flat distal end has a feature that the stopper ridge 5 closely adheres to the gasket 4 with a predetermined width and can be securely sealed.

As shown in the enlarged sectional views of FIGS. 13 and 14, the stopper ridges 5 provided in the middle of the outer can 2 bite into the outer peripheral surface of the gasket 4 which is elastically deformed.
Is firmly fixed to the fixed position of the outer can 2. When the stopper ridges 5 bite into the gasket 4, the outer peripheral surface of the gasket 4 is crushed linearly by the stopper ridges 5 and the outer peripheral grooves 14 are formed.
Can be. The stopper ridge 5 is fitted into the outer peripheral groove 14, and the sealing body 3 is fixed so as not to fall out of the outer can 2 and not to be pushed into the outer can 2. That is, the sealing body 3 is fixed to the outer can 2 with sufficient strength in both directions indicated by arrows A and B in FIG. The outer peripheral groove 14 is formed on the outer peripheral surface of the gasket 4 by the stopper ridge 5.
The width (W) of the stopper ridge 5 is formed smaller than the width (D) of the outer peripheral surface of the gasket 4.

The outer can 2 used for the batteries of FIGS.
A peripheral wall 6 is provided by grooving between the sealing body 3 and the electrode body 1. The peripheral wall 6 protrudes from the inner surface of the outer can 2 so as to prevent the sealing body 3 from being pushed into the outer can 2 and to fix the sealing body 3 in a fixed position.

As shown by the arrow A in FIG.
After the electrode body 1 is inserted, the exterior can 2 is provided by grooving from the outside. The peripheral wall 6 is located between the sealing body 3 and the electrode body 1 and is provided so as to protrude inside the outer can 2. The peripheral wall 6 protruding inside the outer can 2 is prevented from contacting the electrode body 1 and the lead 12 connecting the electrode body 1 and the sealing body 3.
An insulating separator 9 is provided between the peripheral wall 6 and the electrode body 1. Further, in order to insulate the inner periphery of the peripheral wall 6, a gasket 4 shown in the figure is provided with a cylindrical ring along the inner surface of the peripheral wall 6 in order to more reliably prevent the peripheral wall 6 from contacting the electrode body 1 and the lead 12. 8 are integrally formed. The gasket 4 shown in the figure has a tubular ring 8 extending vertically downward along the inner peripheral edge. The lower end of the cylindrical ring 8 is brought into contact with the insulating separator 9 in the step of caulking. In the battery incorporating the gasket 4, the upper and inner sides of the peripheral wall 6 are covered with the gasket 4, and the lower side of the peripheral wall 6 is covered with the insulating separator 9. As shown in the drawing, the upper and lower surfaces and the inner front surface of the peripheral wall 6 are covered, so that an internal short circuit can be reliably prevented. In the battery shown in the figures, the cylindrical ring 8 is integrally formed with the gasket 4, but as shown in FIG. 16, the cylindrical ring 8 may be integrally formed with the insulating separator 9.

The gasket 4 is sandwiched between the outer can 2 and the sealing body 3 to insulate and connect the outer can 2 and the sealing body 3 in an airtight manner. The gasket 4 is generally manufactured by molding nylon. The gasket 4 has a fitting groove 4A for fitting the outer peripheral edge of the sealing body 3 on the inner circumferential surface, and the sealing body 3 is fitted therein. Further, since the gasket 4 is disposed on the inner surface of the outer can 2, the outer shape is formed to be equal to or slightly smaller than the inner shape of the outer can 2.

Since the outer can 2 is cylindrical, elliptical or square, the outer shape of the gasket 4 is formed in a circular, elliptical or square shape. Since the gasket 4 is provided along the outer peripheral edge of the sealing body 3, the entire shape is changed to the shape of the sealing body 3.
In a ring shape along the outer periphery of the ring.

Further, the gasket 4 is integrally formed with a positioning locking projection 7 which is locked to the open end of the outer can 2 and specifies the insertion depth into the outer can 2. The positioning locking projection 7 is provided as a projection that contacts the entire open end of the outer can 2 or a plurality of locations. Furthermore, as shown in the enlarged sectional view of FIG. 8, the positioning locking projection 7 has a protrusion amount (L).
Is substantially equal to the thickness of the outer can 2, and the positioning locking projection 7
And the outer surface of the outer can 2 are substantially flush with each other.
In this specification, "the projection amount of the positioning locking projection is substantially equal to the thickness of the outer can" means that the projection amount (L) of the positioning locking projection is the thickness (d) of the outer can 2. ) In the range of 0.8 to 1.2 times. The positioning locking projection 7 having such an amount of protrusion has a top surface substantially equal to the surface of the outer can 2 in an assembled state.

After inserting the sealing body 3 into the outer can 2 via the gasket 4, the opening end of the outer can 2, which locks the positioning locking projection 7, is attached to the outer can 2. Fold along the surface. The bent L-shaped bent portion 13 presses the gasket 4 against the upper surface of the sealing body 3 to connect the sealing body 3 to the outer can 2 in an airtight state. However, in the battery of the present invention, it is not always necessary to bend the open end of the outer can into an L-shape. For example, after inserting a sealing body connecting a gasket into the outer can, a stopper ridge is provided. You can also fix the closure.

The sealing body 3 is manufactured by pressing a metal plate. The outer shape of the sealing body 3 is slightly smaller than the inner shape of the outer can 2 and is shaped to be fixed to the outer can 2 via a gasket 4. The sealing body 3 in FIGS. 3 to 5 is fixed by spot welding two metal plates, and has a safety valve 10 built in between the two metal plates. The safety valve 10 is opened when the internal pressure of the outer can 2 becomes higher than the set pressure, thereby preventing the inner can of the outer can 2 from becoming abnormally high and destroying the outer can 2. The sealing body 3 shown in the figure is a safety valve 10 in which a rubber-like elastic body 11 is inserted between two metal plates. However, although not shown, the safety valve has a structure in which a rubber plate, a plate material, and a spring are disposed between two metal plates forming a sealing body, and the rubber plate is elastically pressed against the valve port by the spring. You can also.

[0034]

[Embodiment 1] The battery shown in FIG. 3 is manufactured by the following steps. (1) As shown in FIG. 6, after the electrode body 1 is put in the outer can 2, the lead 12 connected to the electrode body 1 is connected to the sealing body 3 by spot welding or the like. The gasket 4 is connected to the outer peripheral edge of the sealing body 3. (2) As shown in FIG. 7, the sealing body 3 is set at a fixed position of the opening of the outer can 2. The sealing body 3 is set at a predetermined position of the outer can 2 via the gasket 4. The sealing body 3 is connected to a gasket 4, and the gasket 4 specifies the depth to be inserted into the outer can 2 by applying the positioning locking projection 7 to the opening end of the outer can 2. Positioning locking projection 7 of gasket 4
Is locked to the open end of the outer can 2, and the sealing body 3 is accurately set at a predetermined position of the outer can 2. (3) The outside of the outer can 2 is pressed linearly to form a groove 15, and a stopper ridge 5 is provided along the outer peripheral surface of the gasket 4. The stopper ridge 5 protruding from the inner surface of the outer can 2 cuts into the outer peripheral surface of the gasket 4 to form an outer peripheral groove 14 in the outer peripheral surface of the gasket 4. The stopper ridge 5 is fitted into the outer peripheral groove 14, and the sealing body 3 is airtightly fixed to the outer can 2 via the gasket 4. Stopper ridge 5
Is provided along the outer peripheral surface of the gasket 4 so as to bite into the outer peripheral surface of the gasket 4 mounted at the position determined by the positioning locking projection 7. (4) Thereafter, as shown in FIG. 3, the opening edge of the outer can 2 is bent inward along the gasket 4. The bent L-shaped bent portion 13 presses the upper surface of the sealing body 3 via the gasket 4, and hermetically closes the outer can 2 via the gasket 4. (5) External can 2 so that the external shape of external can 2 is slightly smaller
Is drawn. In the drawing process, for example, the whole is thinned so that the outer diameter of the cylindrical outer can 2 is reduced by about 0.5 mm. In the drawing process, the outer diameter of the outer can 2 is 0.2 to 0.1 mm.
It can be made 8 mm thinner. When the outer can 2 becomes thinner by drawing, the stopper ridges 5 penetrate deeply into the outer peripheral surface of the gasket 4, and the sealing body 3 is firmly fixed to the outer can 2. This battery has a stopper ridge 5 and a sealing body 3
Then, the gasket 4 is more securely clamped to fix the sealing body 3 in a fixed position.

In particular, finally, the manufacturing method for drawing and thinning the outer can 2 is that the electrode can 1 is smoothly inserted into the outer can 2 having the stopper ridge 5 provided on the inner surface. Has a feature that it can be firmly fixed by deeply penetrating into the gasket 4. However, the step of drawing the outer can 2 may be the step (4) of bending the opening edge of the outer can 2 inward, or the step (3) of pressing the outer side of the outer can 2 to form the groove 1.
5 may be performed prior to the step of providing the stopper ridges 5.

[Example 2] A method for fixing a sealing body to an outer can after placing an electrode body in an outer can provided with a stopper ridge is as follows. (1) As shown in FIG. 10, after the electrode body 1 is put into the outer can 2 provided with the stopper ridges 5 on the inner surface, the leads 12 connected to the electrode body 1 are sealed as shown in FIG. It is connected to the body 3 by a method such as spot welding. The gasket 4 is connected to the outer peripheral edge of the sealing body 3. (2) The sealing body 3 is set at a fixed position of the opening of the outer can 2. The sealing body 3 is set at a predetermined position of the outer can 2 via the gasket 4. The sealing body 3 is connected to a gasket 4, and the gasket 4 specifies the depth to be inserted into the outer can 2 by applying the positioning locking projection 7 to the opening end of the outer can 2. The positioning locking projection 7 of the gasket 4 is locked to the opening end of the outer can 2, and the sealing body 3 is accurately set at a predetermined position of the outer can 2. In this state, the stopper ridges 5 projecting from the inner surface of the outer can 2 bite into the outer peripheral surface of the gasket 4 to form the outer peripheral groove 14 on the outer peripheral surface of the gasket 4. The stopper ridge 5 is fitted into the outer peripheral groove 14, and the sealing body 3 is airtightly fixed to the outer can 2 via the gasket 4. (3) Same as (4) of Example 1. (4) Same as (5) of the first embodiment. In the battery manufactured in the above process, the gasket 4 is accurately set at the determined position of the outer can 2 by the positioning locking projection 7, and the gasket 4 is securely fixed by the stopper ridge 5 and the sealing body 3. And the sealing body 3 can be fixed to the outer can 2 with high accuracy.

Example 3 A method for fixing a sealing body to an outer can using an outer can provided with an outer peripheral ridge on the outside produces a battery as follows. (1) The same as (1) of Example 1 except that the outer can 2 in which the outer peripheral convex strip 16 is provided as shown in FIG. (2) Same as (2) of Example 1. (3) After that, press the outside of the outer can 2
6 is pressed from the outside, and a stopper ridge 5 is provided on the inner surface of the outer can 2 along the outer peripheral surface of the gasket 4. (4) Same as (4) of Example 1. (5) Same as (5) of the first embodiment. In the battery manufactured in the above process, the gasket 4 is accurately set at the determined position of the outer can 2 by the positioning locking projection 7, and the gasket 4 is securely fixed by the stopper ridge 5 and the sealing body 3. And the sealing body 3 can be fixed to the outer can 2 with high accuracy.

Embodiment 4 As shown in FIG. 4, a battery in which a sealing body is fixed by a peripheral wall without providing a stopper ridge is manufactured as follows. (1) After placing the electrode body 1 in the outer can 2, the outer can 2 is grooved from the outside to provide a peripheral wall 6 projecting inward. The peripheral wall 6 is provided between the sealing body 3 and the electrode body 1. Thereafter, the lead 12 connected to the electrode body 1 is connected to the sealing body 3 by spot welding or the like. The gasket 4 is connected to the outer peripheral edge of the sealing body 3. (2) As shown in FIG. 15, the sealing body 3 is set at a fixed position of the opening of the outer can 2. The sealing body 3 is set at a predetermined position of the outer can 2 via the gasket 4. The sealing body 3 is connected to a gasket 4, and the gasket 4 specifies the depth to be inserted into the outer can 2 by applying the positioning locking projection 7 to the opening end of the outer can 2. The positioning locking projection 7 of the gasket 4 is locked to the open end of the outer can 2, and the sealing body 3 is
Is set exactly at the determined position. (3) The opening edge of the outer can 2 is bent inwardly in an L-shape, and the sealing body 3 is sandwiched and fixed between the L-shaped bent portion 13 and the peripheral wall 6.
In this state, the sealing body 3 is sandwiched via the gasket 4. (4) Further, press the L-shaped bent portion 13 from above, and
The gasket 4 is securely clamped between the bent portion 13 and the peripheral wall 6 to make it airtight. In this step, the peripheral wall 6 is also crushed and comes into contact with the upper surface of the electrode body 1. An insulating separator 9 is provided between the peripheral wall 6 and the electrode body 1 to prevent the electrode body 1 from contacting the peripheral wall 6 of the outer can 2 and short-circuiting. (5) The same drawing as in (5) of the first embodiment is performed.

Embodiment 5 As shown in FIG. 5, a battery in which a peripheral wall is provided between a sealing body and an electrode body and the sealing body is fixed by a convex ridge is manufactured as follows. (1) Same as (1) of Example 4. (2) Same as (4) of Example 4. (3) Same as (3) of Example 1. (4) Thereafter, as shown in FIG. 5, the opening edge of the outer can 2 is bent inward along the gasket 4. The bent L-shaped bent portion 13 presses the upper surface of the sealing body 3 via the gasket 4, and hermetically closes the outer can 2 via the gasket 4. (5) Same as (4) of Example 4. (6) The same drawing as in (5) of the first embodiment is performed. However, in the step of drawing the outer can 2, the step of (4) bending the opening edge of the outer can 2 inward or the step of (3) pressing the outer side of the outer can 2 to form a groove 15. It can be performed before the step of providing the stopper ridge 5.

[0040]

The battery and the manufacturing method of the present invention have a feature that the sealing body can be inserted into the outer can at a precise position via the gasket. That is, the battery of the present invention and its manufacturing method
The opening of the outer can housing the electrode body is locked at the opening end of the outer can with a sealing body via a gasket having a positioning locking convex portion that specifies the insertion depth into the outer can. This is because it is airtightly closed. This gasket can always be mounted to the opening of the outer can with the same insertion depth by locking the positioning locking projection to the opening end of the outer can. Therefore, the battery of the present invention and the method for manufacturing the same ensure that the sealing body is accurately positioned at the opening of the outer can via the gasket, and minimize the displacement of the relative position between the sealing body and other parts. ,
Mass production of batteries with high precision external dimensions.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional battery manufacturing process.

FIG. 2 is a cross-sectional view of a battery that fixes a sealing body in a fixed position without providing a peripheral wall.

FIG. 3 is a cross-sectional view of the battery of Example 1 of the present invention.

FIG. 4 is a partial cross-sectional front view of a battery according to a fourth embodiment of the present invention.

FIG. 5 is a partial cross-sectional front view of a battery according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view showing a manufacturing process of the battery shown in FIG. 3;

FIG. 7 is a sectional view showing a manufacturing process of the battery shown in FIG. 3;

8 is an enlarged sectional view of a main part of the battery shown in FIG.

FIG. 9 is a partial cross-sectional front view of an outer can used for the battery of Example 3 of the present invention.

FIG. 10 is a partial cross-sectional front view of an outer can used for the battery of Example 2 of the present invention.

FIG. 11 is a partial sectional front view showing another example of the outer can.

FIG. 12 is a partial cross-sectional front view showing another example of the outer can.

FIG. 13 is an enlarged sectional view of a main part of a battery according to a second embodiment of the present invention.

14 is an enlarged sectional view of a main part of the battery shown in FIG.

FIG. 15 is a sectional view showing a manufacturing process of the battery shown in FIG. 4;

FIG. 16 is a sectional view showing a manufacturing process of a battery according to another embodiment of the present invention.

FIG. 17 is a sectional view showing a manufacturing process of the battery according to the second embodiment of the present invention.

[Explanation of symbols]

1: Electrode body 1A: Positive electrode plate 1
B ... Negative electrode plate 1C ... Separator 2 ... Outer can 3 ... Sealing body 4 ... Gasket 4A ... Fitting groove 5 ... Stopper ridge 6 ... Peripheral wall 7 ... Position locking protrusion 8 ... Cylindrical ring 9 ... Insulating separator 10 ... Safety valve 11 ... Rubber-like elastic body 12 ... Lead 13 ... L-shaped bent part 14 ... Outer peripheral groove 15 ... Groove 16 ... Outer peripheral convex ridge

Claims (13)

[Claims] 1. An electrode body (1) having a separator (1C) disposed between a positive electrode plate (1A) and a negative electrode plate (1B), and an outer can containing the electrode body (1). (2) and a battery comprising a sealing body (3) that hermetically closes the opening of the outer can (2) via a gasket (4), wherein the gasket (4) has an outer can (2) A battery that has a positioning locking projection (7) that is locked to the open end of the (1) and specifies the insertion depth into the outer can (2). 2. The positioning locking projection (7) is a projection that contacts the entire open end or a plurality of locations of the open end of the outer can (2).
The battery described in 1. 3. An open end of an outer can (2) that locks the positioning locking projection (7) is bent along the surface of the sealing body (3), and the bent L is bent. The battery according to claim 1, wherein the bent portion (13) presses the upper surface of the sealing body (3) via the gasket (4). 4. The position of the positioning and locking projection (7) is equal to the amount of protrusion of the outer can (2).
The top surface of the positioning locking projection (7) and the surface of the outer can (2) are substantially flush with each other.
The battery described in 1. 5. A stopper ridge (5) protruding from the inner surface of the outer can (2) along the outer peripheral surface of the gasket (4), and the stopper ridge (5) and the sealing body (3) are provided. Gasket with outer edge
The battery according to claim 1, wherein (4) is sandwiched. 6. A stopper ridge (5) cuts into the outer peripheral surface of the gasket (4) to form an outer peripheral groove (14) in the outer peripheral surface of the gasket (4). The battery according to claim 5, wherein the sealing body (3) is fixed to the outer can (2) by inserting the article (5). 7. The battery according to claim 5, wherein the outer can (2) is bent so as to form a groove (15) on the outer surface and a stopper ridge (5) is provided on the inner surface. 8. The battery according to claim 5, wherein the outer can (2) is formed thick along the sealing body (3) and is provided with a stopper ridge (5) projecting from the inner surface. 9. An outer can between the sealing body (3) and the electrode body (1).
The battery according to claim 5, wherein a peripheral wall protruding inward of (2) is not provided. 10. An electrode body (1) having a separator (1C) disposed between a positive electrode plate (1A) and a negative electrode plate (1B);
A method for producing a battery comprising: an outer can (2) containing the same; and a sealing body (3) that hermetically closes an opening of the outer can (2) via a gasket (4). A gasket (4) that is locked to the open end of the can (2) and has a positioning locking projection (7) that specifies the insertion depth into the outer can (2)
Is attached to the opening of the outer can (2), and then the open end of the outer can (2) is bent along the surface of the sealing body (3), and the bent L
A method for manufacturing a battery, in which a gasket (4) is pressed against the upper surface of a sealing body (3) at a bent portion (13). 11. A stopper ridge (5) protruding from the inner surface of the outer can (2) is provided along the outer peripheral surface of the gasket (4), and the stopper ridge (5) is used to seal the gasket (4) through the gasket (4). The method for producing a battery according to claim 10, wherein the body (3) is fixed. 12. An outer can between a sealing body (3) and an electrode body (1).
The method for manufacturing a battery according to claim 11, wherein the sealing body (3) is fixed via the gasket (4) with the stopper ridge (5) without providing a peripheral wall protruding inside the (2). 13. An outer can between a sealing body (3) and an electrode body (1).
A peripheral wall (6) protruding inside the (2) is provided, and the sealing body (3) is mounted in a fixed position via a gasket (4) at the peripheral wall (6) and the L-shaped bent portion (13). The method for producing a battery described in 1.