JP2002141028A - Sealed cell and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix an aperture sealing body with an enough strength by caulking an outer case. SOLUTION: The sealed cell comprises an electrode 1 consisted of a separator 1C interposed between a positive pole plate 1A, and a negative pole plate 1B, an outer case 2 housing the electrode 1, and an aperture sealing body 3 airtightly fixed to an aperture part of the outer case 2 by caulking process. Further, the sealed cell has a reinforcing member 5 fixed along the aperture part of the outer case 2, which is an independent parts from the outer case 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery in which an opening of an outer can is caulked to fix a sealing member airtightly.

[0002]

2. Description of the Related Art A sealed battery is manufactured by filling an electrode body and an electrolytic solution in a cylindrical outer can closing the bottom, and then hermetically closing the opening of the outer can with a sealing body. In the structure in which the outer can is hermetically sealed by the sealing body, a rubber-like elastic gasket is sandwiched between the sealing body and the outer can by airtight sealing. A conventional battery having this structure is manufactured by the following steps as shown in FIG.

[0003] The electrode body 1 wound by laminating a positive electrode plate 1A and a negative electrode plate 1B via a separator 1C is inserted into an outer can 2 having a closed bottom. After inserting the electrode body 1,
The insulating separator 9 is put on the upper surface of the electrode body 1. The outer can 2 is grooved from the outer peripheral surface to provide a peripheral wall 7. The peripheral wall 7 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. An electrolytic solution is injected into the outer can 2 and permeates the electrode body 1. The lead 8 connected to the electrode body 1 is connected to the sealing body 3 by spot welding. After the sealing body 3 is set 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 6 and the peripheral wall 7 sandwich the sealing body 3. And fix it. 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. Finally, the L-shaped bent portion 6 is pressed from above, and the gasket 4 is securely sandwiched between the L-shaped bent portion 6 and the peripheral wall 7 to make the airtight state.

[0004]

A battery for fixing a sealing body to an outer can by caulking is manufactured through the above steps.
In recent years, demands for lighter batteries and higher capacity have been increasing. To achieve this,
It is required that the outer can be made as thin as possible. However, when the outer can is made of a thin metal plate, the L-shaped bent portion sandwiching the sealing body is thinned, the strength is reduced, the airtightness is reduced, and liquid leakage is caused.

[0005] In order to solve this drawback, a battery has been developed in which the outer can is made thicker along the opening edge (Japanese Patent Laid-Open No. Hei 4-1992).
296444, JP-A-2000-30673). The battery of this structure has the feature that the strength of the opening can be improved, but has the drawback that the production of the outer can becomes extremely difficult and the production cost becomes considerably high. In addition, this structure
In the actual manufacturing process, there are also the following adverse effects. As shown in FIG. 2, when the opening of the outer can 2 is made thicker so as to protrude inside the case, when the electrode body 1 is put into the outer can 2, the part protruding inward becomes an obstruction. The electrode body cannot be inserted. For this reason, the capacity of the battery cannot be increased even if the outer can is thinned. As shown in FIG. 3, when the opening of the outer can 2 is made thicker so as to protrude outside the case, when the outer can 2 is arranged on the conveyor 11 in order to supply the outer can 2 side by side in the assembling process, an adjacent portion is formed. There is a disadvantage that the outer cans 2 contact each other at a portion protruding outwardly and the opening is inclined. In this state, a large number of outer cans cannot be normally transferred while being arranged on the conveyor.

A battery shown in FIG. 4 has been developed as a sealed battery which solves such a disadvantage (Japanese Patent Laid-Open No. 9-92).
236). The battery shown in this figure has a two-layer structure in which the opening edge of the outer can 2 is turned outward. However, this structure
Since the same material as the outer can 2 is bent, there is a limit to the strength enhancement. Further, when the opening edge of the outer can 2 is bent in this shape, the metal material is broken, resulting in a defective product and a reduction in yield.

[0007] The present invention has been developed with the object of solving such disadvantages. An important object of the present invention is to provide a sealed battery in which an outer can can fix a sealing body with sufficient strength, and a method for manufacturing the same.

[0008]

A sealed 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 exterior housing the electrode body 1 therein. A can 2 and a sealing body 3 airtightly fixed to the opening of the outer can 2 by caulking. In addition, sealed batteries
A reinforcing member 5, which is a component separate from the outer can 2, is fixed along the opening of the outer can 2.

The sealed battery, which is a cylindrical battery, includes a reinforcing member 5.
Can be a circular ring. Further, in a sealed battery that is a square battery, the reinforcing member 5 can be a square ring.

Further, in the sealed battery of the present invention, the reinforcing member 5 can be fixed to the upper surface of the L-shaped bent portion bent inward by caulking.

Further, the sealed battery of the present invention has a reinforcing member 5
The reinforcing member 5 can be fixed by inserting the outer can opening edge into the groove 5A of the reinforcing member 5 with the cross-sectional shape of the groove as a groove. The sealed battery in which the reinforcing member 5 has a groove-shaped cross section is provided with a thin fitting portion 2a at the opening edge of the outer can 2, and the fitting portion 2a is fitted into the groove 5A of the reinforcing member 5. Can be. In this sealed battery, the outer width of the groove of the reinforcing member 5 can be the same as the thickness of the outer can 2. further,
The groove-shaped reinforcing member 5 is such that the opening edge of the outer can 2 is fitted into the groove 5A and the opening edge is sandwiched by the groove 5A to fix the reinforcing member 5 to the outer can. Can be fixed by welding.

Further, the sealed battery according to the present invention includes a reinforcing member 5
May be fixed in an L-shape by fitting the opening edge of the outer can 2 into the notch 5B of the reinforcing member 5.

The method for manufacturing a sealed battery according to the present invention comprises the steps of:
After the electrode body 1 in which the separator 1C is disposed between A and the negative electrode plate 1B and the electrolytic solution are placed in the outer can 2, the outer can 2
The opening 3 is caulked to fix the sealing body 3 in an airtight manner.
Further, in the method of manufacturing the sealed battery, the reinforcing member 5 is fixed along the opening of the outer can 2 that has been crimped and reinforced.

The reinforcing member 5 can be fixed to the upper surface of the L-shaped bent portion 6 by bending the opening of the outer can 2 to form an L-shaped bent portion 6.

Further, the method for producing a sealed battery according to the present invention comprises:
The reinforcing member 5 is connected to the opening edge of the outer can 2 containing the electrode body 1, and the outer can 2 to which the reinforcing member 5 is connected is caulked to fix the sealing body 3.

As the reinforcing member 5, a groove-type reinforcing member 5 having a groove-shaped cross section is used, and the opening edge of the outer can 2 is inserted into the groove 5A of the reinforcing member 5 and caulking can be performed. Further, as the reinforcing member 5, a reinforcing member 5 having an L-shaped cross section may be used, and the notch 5B of the reinforcing member 5 may be fitted with the opening edge of the outer can 2 to perform crimping.

[0017]

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

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. 5 to 7 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 this battery, the sealing body 3 is fixed by caulking the outer can 2. The batteries in this figure are nickel-hydrogen batteries, nickel-cadmium batteries,
It is a secondary battery such as a lithium ion secondary battery.

When the battery is a nickel-hydrogen battery, an electrode plate having a core coated with an active material mainly composed of a hydrogen-absorbing alloy is used as a negative electrode plate, and a nickel core is used as a slurry for 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 via a separator 1C 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 manufactured by pressing a metal plate into a cylindrical shape having a closed bottom. The metal plate used for the outer can 2 may be a metal plate on the surface of iron, aluminum, an aluminum alloy, a clad material in which a plurality of metals are laminated, or the like. Nickel is used for metal plating.

The outer can 2 has a reinforcing member 5 which is a separate component from the outer can 2 fixed along the opening. Reinforcing member 5
Is fixed along the opening of the outer can 2, so that the reinforcing member of the cylindrical battery is a circular ring, and the reinforcing member of the square battery is a square ring. However, the reinforcing member of the cylindrical battery does not necessarily have to be circular, but may be a shape combining a plurality of straight lines, for example, a regular polygon. By increasing the number of sides, the polygonal reinforcing member can be shaped along the circular opening.

Further, the reinforcing member does not necessarily have to be formed in a ring shape connected in a ring shape. Although not shown, the reinforcing member may have a shape in which a part of the ring is cut away. Further, in the case of a cylindrical battery, the reinforcing ring may have a shape obtained by dividing an arc as shown in FIG. In the cylindrical battery shown in this figure, an arc-shaped reinforcing member 5 as three parts is fixed along the opening of the outer can 2. However, the reinforcing member having a shape in which the arc is divided may be two or four or more parts. Further, in the prismatic battery, although not shown, the reinforcing member may have a U-shape, an L-shape, or a shape obtained by dividing a straight line, and a plurality of parts may be fixed along the opening of the outer can. .

In the sealed battery shown in FIGS. 6 and 7, the reinforcing member 5 is fixed to the upper surface of the L-shaped bent portion 6 which is bent inward by caulking. The reinforcing member 5 is fixed to the upper surface of the L-shaped bent portion 6 by resistance welding after the outer can 2 is crimped to fix the sealing body 3. The reinforcing member 5
Instead of welding, it can be fixed by bonding with an adhesive. The reinforcing member 5 fixed here has an inner shape substantially equal to or slightly smaller than the inner circumferential shape of the L-shaped bent portion 6 and an outer shape substantially equal to or smaller than the outer shape of the outer can 2. Slightly smaller than. The reinforcing member 5 that is fixed to the L-shaped bent portion 6 by welding is a metal plate that is thicker than the outer can 2 or approximately equal in thickness to the outer can 2. Any metal plate that can be resistance-welded can be used. For example, an iron plate whose surface is metal-plated like the outer can 2 is used. Further, the reinforcing member 5 can have a thin and strong structure by using a metal plate having a higher strength than the outer can 2, for example, a high-tensile steel. The reinforcing member 5 bonded and fixed to the L-shaped bent portion 6 does not necessarily need to be a metal plate, and for example, a plastic reinforced with glass fiber or carbon fiber can be used. The sealed battery having the above structure has a feature that a sealing member is fixed to an L-shaped bent portion of a battery manufactured by the same method as that of the related art so that the sealing portion has a strong structure.

In the sealed battery shown in FIGS. 9 to 11, a reinforcing member 5 having a groove-shaped cross section is fixed to the opening edge of the outer can 2. The reinforcing member 5 is fixed to the outer can 2 by fitting an opening edge into the groove 5A. The reinforcing member 5 is fixed to the outer can 2 by sandwiching the opening edge with the groove 5A, or is fixed to the outer can 2 by resistance welding the inner surface of the groove 5A to the surface of the opening edge. However, if the reinforcing member 5 having this structure is formed by inserting the opening edge into the groove 5A and bending the opening edge without being pinched or welded, the reinforcing member 5 does not come off from the opening edge. Therefore, the reinforcing member 5 can be fixed to the opening edge by bending without necessarily welding or bonding the opening edge.

The reinforcing member 5 of this structure is not attached after the opening is bent into an L shape as in the battery of FIG. Be linked.
FIG. 11 shows a state in which the reinforcing member 5 is set on the opening edge. As shown in this figure, after the sealing body 3 is set in the opening, it is attached to the opening edge in a process before bending the opening edge. When the opening edge of the outer can 2 is inserted into the groove 5 </ b> A of the reinforcing member 5, the reinforcing member 5 is inserted between the gasket 4 and the outer can 2. That is, the gasket 4 is disposed inside the reinforcing member 5. After setting the reinforcing member 5 in this state,
The opening of the outer can 2 is bent into an L shape and caulked.
The reinforcing member 5 is bent inward together with the opening of the outer can 2 by caulking. Therefore, the crimped L-shaped bent portion 6 is in a state where the reinforcing member 5 is fixed to the opening edge, and is reinforced by the reinforcing member 5 firmly.

Further, in the sealed battery shown in FIGS. 12 to 14, the opening edge of the outer can 2 is thinned to provide a fitting portion 2a,
The fitting portion 2 a is fitted into the groove 5 </ b> A of the reinforcing member 5 so that the outer width of the groove of the reinforcing member 5 is the same as the thickness of the outer can 2.
With this structure, the thickness of the opening can be made the same as that of the other portions while the reinforcing member 5 is fixed. For this reason, the electrode body 1 can be put into the outer can 2 in a state where the reinforcing member 5 is attached to the opening edge of the outer can 2. This is because the reinforcing member 5 does not cause the opening of the outer can 2 to protrude inward. Therefore, the reinforcing member 5 having this structure can be used at any time in the process before bending the opening of the outer can 2 into an L-shape, for example, before manufacturing the outer can 2 and inserting the electrode body 1. It can also be attached to

The entire thickness of the reinforcing member 5 having this structure is limited to the thickness of the outer can 2. Therefore, the opening of the outer can 2 is reinforced by using a metal having a higher strength than the outer can 2, for example, a high-tensile steel. Further, the groove-shaped reinforcing member 5
As shown in FIG. 15, in a state where the inner surface of the outer can is mounted on the opening edge of the outer can 2, the inner surface of the outer can is made to be the same plane, and the outer can is protruded only outward, so that the opening edge of the outer can 2 can be reinforced more strongly. The outer can 2 has a cutout 2b so that a step is formed on the inner surface along the opening edge. The reinforcing member 5 is configured such that a portion attached to the inside of the outer can 2 is fitted into the notch 2b so as to be flush with the inner surface of the outer can 2.

The reinforcing member 5 having this structure can be fixed to the outer can 2 by sandwiching the opening edge with the groove 5A, or can be fixed to the outer can 2 by resistance welding the inner surface of the groove 5A to the surface of the opening edge. . However, the reinforcing member 5 having this structure can also be fixed so as not to fall through the opening edge without being pinched or welded. Therefore, the reinforcing member 5 can also be fixed to the opening edge by bending without necessarily welding or bonding the opening edge.

Further, in the sealed battery shown in FIGS. 16 and 17, a reinforcing member 5 having an L-shaped cross section is fixed to the opening edge of the outer can 2. The reinforcing member 5 is bent in an L-shape, and has a notch 5B formed inside the L-shape.
The opening edge is fitted and fixed to the outer can 2. In the sealed battery shown in FIG. 16, a notch 5B is formed above the reinforcing member 5 in the figure, and the inner surface of the opening is in close contact with the notch 5B. In the sealed battery shown in FIG. 17, a notch 5B is formed below the reinforcing member 5 in the figure, and the cutout 5B is fixed in a state where the outer surface of the opening is in close contact with the notch 5B. In the sealed battery shown in these figures, for example, the reinforcing member 5 is connected to the opening edge in a process before bending the opening into an L shape.

FIG. 18 shows a state in which the reinforcing member 5 shown in FIG. The reinforcing member 5 shown in this figure is provided with a bent portion 5 </ b> C by bending the upper end of a cylindrical ring outward, and is inserted inside the opening of the outer can 2. When the reinforcing member 5 having this structure is inserted into the opening of the outer can 2, the bent portion 5 </ b> C can be inserted into the opening can until it comes into contact with the opening edge. The reinforcing member 5 is inserted between the gasket 4 and the outer can 2. Reinforcing member 5
Is fixed to the outer can 2 by resistance welding or bonding the outer surface to the inner surface of the opening. However, the reinforcing member 5 having this structure is not necessarily fixed to the opening edge because if the opening is bent after being attached to the opening edge, the reinforcing member 5 will not come off from the opening edge. Exterior can 2 equipped with reinforcing member 5
Is crimped by bending the opening into an L-shape. The reinforcing member 5 is bent inward together with the opening of the outer can 2 by caulking. L-shaped bent part 6 that has been crimped
Is in a state where the reinforcing member 5 is fixed to the opening edge, and is reinforced by the reinforcing member 5 firmly.

FIG. 19 shows a state in which the reinforcing member 5 shown in FIG. The reinforcing member 5 shown in this figure has a bent portion 5C with the upper end bent inward, and is mounted outside the opening of the outer can 2.
When the reinforcing member 5 having this structure is attached to the opening of the outer can 2, it can be inserted until the bent portion 5C serves as a positioning convex portion until it comes into contact with the opening edge. Since the reinforcing member 5 is mounted outside the opening, it does not protrude inside the opening of the outer can 2. Therefore, this reinforcing member 5 is used for the outer can 2.
In the pre-process of bending the opening portion into an L-shape, the outer can 2 can be attached to the outer can 2 at any time, for example, before the outer can 2 is manufactured and the electrode body 1 is inserted. This reinforcing member 5
Is fixed to the outer can 2 by resistance welding or bonding the outer surface to the inner surface of the opening. The outer can 2 to which the reinforcing member 5 is attached is crimped by bending the opening into an L-shape. The reinforcing member 5 is bent inward together with the opening of the outer can 2 by caulking.

However, in the sealed battery shown in FIG. 17, the reinforcing member 5 can be mounted after the opening of the outer can 2 is bent into an L shape as shown in FIG. Since the reinforcing member 5 has the bent portion 5C on the inner peripheral side protruding downward, the bent portion 5C can be disposed along the inner peripheral edge of the L-shaped bent portion 6. That is, this reinforcing member 5 is
There is a feature that C can be disposed accurately at a predetermined position on the upper surface of the L-shaped bent portion 6 as a positioning convex portion. The protrusion amount and width of the bent portion 5C are designed to be optimum values so that the tip of the bent portion 5C does not contact the sealing body 3 in a state where the reinforcing member 5 is fixed.
The reinforcing member 5 is fixed by welding or bonding with an adhesive.

The gasket 4 is sandwiched between the outer can 2 and the sealing body 3 in order to insulate and connect the outer can 2 and the sealing body 3 in an airtight manner. The outer can 2 is manufactured by molding a rubber-like elastic body such as plastic, synthetic rubber, or nylon that can be elastically deformed. The gasket 4 is formed to have a U-shaped cross section, and a fitting groove 10 for fitting the outer peripheral edge of the sealing body 3 is provided 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.

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 is fixed by spot welding two metal plates. The sealing body 3 can also incorporate a safety valve between two metal plates. The sealing body with a built-in safety valve opens when the internal pressure of the outer can becomes higher than the set pressure, thereby preventing the inner pressure of the outer can from becoming abnormally high and destroying the outer can. The safety valve built in the sealing body is, for example, a rubber-like elastic body inserted between two metal plates, or a rubber plate, a plate material, and a spring disposed between two metal plates. Can be elastically pressed against the valve port by a spring.

[0039]

The sealed battery of the present invention and the method for producing the same have a feature that the outer can can fix the sealing body with sufficient strength. This is because the sealed battery of the present invention and the method of manufacturing the same fix a reinforcing member, which is a separate component from the outer can, along the opening of the outer can. In this structure, the portion of the outer can to be crimped can be reinforced by the reinforcing member, so that the strength of this portion is increased and the sealing body can be securely fixed. Therefore, the sealed battery of the present invention and the method for manufacturing the same can make the outer can as thin as possible, and furthermore, the sealing body can be firmly fixed to the outer can by caulking, thereby realizing weight reduction and high capacity of the battery. In addition, adverse effects such as a decrease in airtightness and liquid leakage can be minimized.

[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 showing an example of a conventional battery outer can.

FIG. 3 is a cross-sectional view showing another example of a conventional battery outer can.

FIG. 4 is a sectional view of another conventional battery.

FIG. 5 is a sectional view of a sealed battery according to an embodiment of the present invention.

6 is a perspective view of the sealed battery shown in FIG.

7 is an exploded perspective view of the sealed battery shown in FIG.

FIG. 8 is a sectional view of a sealed battery according to another embodiment of the present invention.

FIG. 9 is a sectional view of a sealed battery according to another embodiment of the present invention.

FIG. 10 is a perspective view of the sealed battery shown in FIG. 9;

11 is an exploded cross-sectional view showing a manufacturing process of the sealed battery shown in FIG.

FIG. 12 is a sectional view of a sealed battery according to another embodiment of the present invention.

13 is a perspective view of the sealed battery shown in FIG.

14 is an exploded cross-sectional view showing a manufacturing process of the sealed battery shown in FIG.

FIG. 15 is an enlarged sectional view of a main part of a sealed battery according to another embodiment of the present invention.

FIG. 16 is an enlarged sectional view of a main part of a sealed battery according to another embodiment of the present invention.

FIG. 17 is an enlarged sectional view of a main part of a sealed battery according to another embodiment of the present invention.

18 is an exploded cross-sectional view showing a manufacturing process of the sealed battery shown in FIG.

19 is an exploded cross-sectional view showing a manufacturing process of the sealed battery shown in FIG.

FIG. 20 is an exploded sectional view of a sealed battery according to another 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 2a: fitting part 2
b: Notch 3 ... Sealing body 4 ... Gasket 5 ... Reinforcing member 5A ... Groove 5
B: Notched portion 5C: Bent portion 6: L-shaped bent portion 7: Peripheral wall 8: Lead 9: Insulating separator 10: Fitting groove 11: Conveyor

Continued on the front page (72) Inventor Nobukazu Yamanishi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Yasuhiro Iwata 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka F-term (reference) in Sanyo Electric Co., Ltd. 5H011 AA01 AA17 CC02 CC06 CC12 DD05 DD12 DD13 DD15 DD26

Claims (14)

[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 sealing body (3) which is hermetically fixed by caulking at the opening of the outer can (2), wherein the outer casing is provided along the opening of the outer can (2). A sealed battery characterized by fixing a reinforcing member (5), which is a separate component from the can (2). 2. The sealed battery according to claim 1, wherein the sealed battery is a cylindrical battery and the reinforcing member is a circular ring. 3. The sealed battery according to claim 1, wherein the sealed battery is a prismatic battery, and the reinforcing member is a prismatic ring. 4. The sealed battery according to claim 1, wherein a reinforcing member (5) is fixed to the upper surface of the L-shaped bent portion (6) bent inward by caulking. 5. The reinforcing member (5) has a groove-shaped cross section,
The sealed battery according to claim 1, wherein the reinforcing member (5) is fixed by fitting an opening edge of the outer can (2) into the groove (5A) of the reinforcing member (5). 6. A thin fitting portion (2a) is provided at the opening edge of the outer can (2), and the fitting portion (2a) is fitted into the groove (5A) of the reinforcing member (5). The sealed battery according to claim 5, wherein the outer dimension of the groove width of the reinforcing member (5) is the same as the thickness of the outer can (2). 7. A groove-shaped reinforcing member (5) is fitted into the opening edge of the outer can (2), and the reinforcing member (5) is sandwiched by the groove (5A) of the reinforcing member (5). The sealed battery according to claim 5, which is fixed to the outer can (2). 8. The grooved reinforcing member (5) is fitted into the opening edge of the outer can (2), and the reinforcing member (5) is fixed to the outer can (2) by welding. Sealed batteries. 9. The reinforcing member (5) has an L-shaped cross section, and the opening edge of the outer can (2) is fitted into the notch (5B) of the reinforcing member (5) so that the reinforcing member (5) is formed. Claim 1 wherein 5) is fixed.
The sealed battery described in 1. 10. An electrode body (1) in which a separator (1C) is disposed between a positive electrode plate (1A) and a negative electrode plate (1B), and an electrolytic solution placed in an outer can (2) In a method for manufacturing a sealed battery in which the opening of the outer can (2) is caulked to fix the sealing body (3) in an airtight manner, the reinforcing member (5) is provided along the opening of the caulked outer can (2).
A method for producing a sealed battery, comprising fixing and reinforcing a battery. 11. An opening of the outer can (2) is bent into an L-shaped bent portion (6), and a reinforcing member (5) is provided on the upper surface of the L-shaped bent portion (6).
The method for manufacturing a sealed battery according to claim 10, wherein the sealing battery is fixed by welding. 12. An electrode body (1) in which a separator (1C) is provided between a positive electrode plate (1A) and a negative electrode plate (1B), and an electrolytic solution placed in an outer can (2) In a method of manufacturing a sealed battery in which the opening of the outer can (2) is caulked to fix the sealing body (3) in an airtight manner, a reinforcing member is provided at the opening edge of the outer can (2) containing the electrode body (1). (5) A method for producing a sealed battery, comprising: caulking an outer can (2) connecting a reinforcing member (5) and fixing a sealing body (3). 13. A reinforcing member (5) using a groove-shaped reinforcing member (5) having a cross-sectional shape of a groove, and an opening edge of an outer can (2) is formed in a groove (5A) of the reinforcing member (5). The method for producing a sealed battery according to claim 12, wherein the sealed battery is inserted and caulked. 14. A reinforcing member (5) having an L-shaped cross section is used as the reinforcing member (5), and a notch (5B) of the reinforcing member (5) is formed with an opening edge of the outer can (2). The method for manufacturing a sealed battery according to claim 13, wherein the fitting is performed by caulking.