JP2001357824A - Sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed battery capable of smoothly attaching to or detaching from an applicable apparatus. SOLUTION: This sealed battery 10 has a power generating element 41 formed by stacking a positive electrode and a negative electrode through an electrolyte layer, and a package 14 for the sealed battery for housing the power generating element 41, and the power generating element 41 is housed and sealed by fusion parts 17A-17D for fusion bonding the inner surfaces of the package 14 for the sealed battery. The fusion parts 17A, 17C are bent along the side of the long side of a housing part 18 for housing the power generating element 41, and corner parts 19A, 19B of the housing part 18 are arranged within the side contour shapes of the housing part 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery,
The present invention relates to a sealed battery that can be easily attached to and detached from a battery accommodating portion provided in a predetermined device.

[0002]

2. Description of the Related Art A sealed battery 40 shown in FIG. 4 has a power generating element 41 in which a positive electrode and a negative electrode are laminated via a gel electrolyte layer.
A positive electrode terminal 42 and a negative electrode terminal 43 connected to the positive electrode and the negative electrode, respectively, and an open end of the positive electrode terminal 42 and a negative electrode terminal in order to prevent external leakage of the electrolyte layer and intrusion of outside air.
And a sealed battery package 44 for accommodating and sealing the power generation element 41 such that the open end of 43 is exposed to the outside.

A sealed battery package 44 is made of a metal foil core made of aluminum foil, and a polyester resin such as polyethylene terephthalate (PET) or a polyamide resin such as nylon or a polyimide resin formed along the surface of the metal foil core. A metal resin composite film 45 in which a protective layer and a fusible resin layer having a metal adhesive property made of a polyolefin resin such as polypropylene (PP) or polyethylene (PE) along the back surface of the metal foil core material are often used. Is done.

In this sealed battery 40, a recess corresponding to the shape of the power generation element 41 is formed in one of a pair of metal resin composite films 45 formed in a rectangular shape in advance, and these metal resin composite films 45 are formed. The power generation element 41 is sandwiched between the composite films 45, 45 in the thickness direction.
By applying pressure in the thickness direction while heating the four sides 45, 45, the fusible resin layers are fused together, and the power generation elements are formed by substantially strip-shaped fusion margins 47A, 47B, 47C, 47D having a predetermined width.
41 is sealed.

[0005] In such a sealed battery 40, in order to prevent external leakage of the electrolyte layer and intrusion of the outside air, each fusion margin is made as wide as possible 47A, 47B, 47C and 47D, and the occupied volume is made as small as possible. In order to achieve this, the welding margin is
A structure for bending 47A and 47C has been proposed.

[0006]

However, as in the sealed battery 40 described above, if the substantially strip-shaped fusion margins 47A and 47C are simply bent along the long side surface of the housing portion 48, the fusion margin may be reduced. Outer corners 49A and 49B of the landing margins 47A and 47C are accommodated in the accommodating section 48.
In this case, the corners 49A and 49B may be caught when the sealed battery 40 is accommodated in the battery accommodating portion of the device to be used. There is a problem that it is difficult to attach and detach the battery 40 smoothly. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a sealed battery that can be smoothly attached to and detached from a device to be used.

[0007]

In order to achieve the above-mentioned object, the present invention provides a power generating element in which a positive electrode and a negative electrode are laminated via an electrolyte layer, And the power generation element is housed and sealed by a fusion allowance for fusing the inner surfaces of the sealed battery package to each other, and a housing for housing the power generation element. A sealed battery in which the fusion allowance is bent along a side surface of the portion,
The present invention is characterized in that a protruding corner portion of the fusion allowance is arranged within a side profile of the housing portion.

Here, as the welding margin, a rectangular or trapezoidal notch or a triangular bent portion or the like is formed at both ends in the longitudinal direction so that the protruding corner portion is arranged at a desired position. I just need. Such a protruding corner may be either an obtuse angle or an acute angle, and may be appropriately rounded.

[0009] In the sealed battery constructed as described above, since the protruding corner portion of the fusion allowance bent along the side surface of the housing portion is arranged in the side profile of the housing portion.
This can reduce the possibility that the protruding corner portion is caught in the battery housing portion of the device to be used, thereby achieving the above-described object.

Further, in the present invention, since the notch is provided at the longitudinal end of the fusion allowance, the bent corner is formed by forming a bent portion. The occupied volume is not increased as compared with the case where the is arranged in the side profile of the accommodation portion.

Furthermore, in the present invention, since the fusion allowance has a substantially trapezoidal shape, since the protruding corner portion is arranged within the side profile of the accommodation portion, the fusion margin is formed. Even if a notch is provided at the longitudinal end of the dressing allowance, it is possible to maintain the same desired moisture permeation resistance as before. Next, in the present invention, as described in claim 4, since the rounded corner is formed, there is a possibility that the rounded corner may be caught when being stored in the battery housing of the device to be used. You can do even less.

Further, in the present invention, as described in claim 5, the fusion allowances are bent along a pair of mutually adjacent side surfaces of the housing portion, and the broken lines of the respective fusion allowances intersect. Since the rounded corners are formed at the flat corners, the sealed battery can also be smoothly attached to and detached from the equipment to be used.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, in each embodiment described below, the members and the like already described in FIG. 4 are denoted by the same reference numerals or corresponding reference numerals in the drawings to simplify or omit the description.

As shown in FIG. 1, in a sealed battery 10 according to a first embodiment of the present invention, after winding a positive electrode and a negative electrode laminated with a separator interposed therebetween, they are pressed in the radial direction to be substantially elliptical. A winding type power generating element 41 formed in a columnar shape, and a power generating element 41 for preventing the electrolyte layer from leaking out or entering the outside air.
And a sealed battery package 14 for accommodating and sealing the power generation element 41 such that the open ends of the positive electrode terminal 42 and the negative electrode terminal 43 connected to the positive electrode and the negative electrode, respectively, are exposed outside.

The metal resin composite film 15 constituting the sealed battery package 14 is made of a metal foil core made of aluminum foil and a polyester resin such as polyethylene terephthalate (PET) or nylon made of nylon or the like along the surface of the metal foil core. A protective layer made of polyamide resin or polyimide resin and a fusible resin layer made of polyolefin resin such as polypropylene (PP) or polyethylene (PE) along the back surface of the metal foil core material with metal adhesion. ing.

In the sealed battery 10, a depression corresponding to the shape of the power generation element 41 is formed in one of the rectangular metal resin composite films 15, 15, and these metal resin composite films 15, 15 are used. By sandwiching the power generation element 41 in the thickness direction and then pressing the four sides of each metal-resin composite film 15, 15 in the thickness direction while heating, the fusible resin layers are fused to each other to have a predetermined width dimension. 17A, 17B, 17C, 17D
After accommodating and sealing the power generation element 41, the fusion allowances 17A and 17C are bent along the long side surfaces of the storage section 18 that houses the power generation element 41.

Here, according to the present invention, the sealed battery 10 has notches 11, 11 at both ends in the longitudinal direction of the fusion margins 17A, 17C.
Is provided. As a result, the fusion allowances 17A and 17C are
It has a substantially trapezoidal shape and each of the protruding corners 19A and 19B.
Are arranged in the long side profile of the accommodation portion 18.

According to the above-described sealed battery 10 of the first embodiment, the protruding corner portions 19A and 19B of the fusion allowances 17A and 17C bent along the long side surfaces of the housing portion 14 are provided. Since it is arranged in the long side profile, there is little danger that the corners 19A and 19B will be caught when the battery is housed in the battery housing of the device to be used. Can be attached and detached smoothly.

In particular, according to this sealed battery 10, the fusion allowance
Since notched portions 11 and 11 are provided at both ends in the longitudinal direction of 17A and 17C, the protruding corners 19A and 19B are arranged in the long side profile of the accommodation portion 18. For example, the fusion allowances 17A and 17C are provided. The occupied volume does not increase as compared with the case where the bent portions are formed at both ends in the longitudinal direction of the. Furthermore, according to such a sealed battery 10, since the fusion margins 17A and 17C are substantially trapezoidal, the notch portions 11 and 11 are formed at both ends in the longitudinal direction of the fusion margins 17A and 17C, respectively.
, The desired moisture permeation resistance substantially the same as the conventional one can be maintained.

FIG. 2 shows a sealed battery 20 according to a second embodiment of the present invention. In each of the embodiments described below, the members and the like already described in FIG. 1 are denoted by the same reference numerals or corresponding reference numerals in the drawings to simplify or omit the description.

The sealed battery 20 of the second embodiment shown in FIG.
Is different from the above-described first embodiment in that rounded corner portions 19A and 19B of the fusion allowances 17A and 17C are different from the above-described first embodiment. Same as the form. According to such a sealed battery 20, since the configuration is basically similar to that of the above-described first embodiment, the same effect as that of the above-described first embodiment can be obtained. According to such a sealed battery 20, since the protruding corners 29A and 29B of the fusion allowances 27A and 27C are rounded, the accommodating corners are required to be accommodated in the battery accommodating section of the device to be used. 29A, 29B
Can be further reduced.

FIG. 3 shows a sealed battery 30 according to a third embodiment of the present invention. The sealed battery 30 has notches at both ends in the longitudinal direction of the fusion margins 37A, 37B, 37C, and 37D, and is bent along the long side surface and the short side surface of the housing portion 38, respectively. 37
Following B, the open ends of the positive terminal 42 and the negative terminal 43 are arranged along the upper surface of the housing 38. In such a sealed battery 30, the protruding corners 29A and 29B of the fusion allowances 37A, 37B, 37C and 37D are arranged in the long side profile and the short side profile of the housing portion 38, respectively. I have.

As shown in FIG. 3B, in such a sealed battery 30, each of the fusion margins 37A, 37B, 37C, and 37D is bent along the long side and the short side of the housing 38, respectively. Then, the portion where the polygonal lines intersect is the corner. On the other hand, as shown in FIG. 3C, in the sealed battery 30, after each of the fusion margins 37A, 37B, 37C, and 37D is bent, a rounded portion 30A is formed at a portion where the broken lines intersect. I have.

According to this sealed battery 30, each fusion allowance 37
Notches 31, 31 provided at both ends in the longitudinal direction of A, 37B, 37C, 37D allow the protruding corners 39A, 39B of each of the fusion allowances 37A, 37B, 37C, 37D to be formed on the long side of the housing 38. Since it is arranged in the contour shape and the short side profile, the same effect as in the above-described first and second embodiments that the device can be smoothly attached to and detached from the equipment to be used is obtained. And according to such a sealed battery 30, each fusion | bonding margin 37A,
37B, 37C, 37D 30
Since A is formed, it can be smoothly attached to and detached from the equipment to be used.

The present invention is not limited to the above-described embodiments, but can be appropriately modified and improved. The power generating element, the sealed battery package, and the like illustrated in the above-described embodiments can be used. The material, shape, size, form, number, location, thickness, etc. of the fusion allowance, the accommodating portion, the corner portion, the notch portion, and the roundness are arbitrary as long as the present invention can be achieved. Not done.

[0026]

As described above, according to the present invention, as described in the first aspect, the protruding corner portion of the fusion allowance bent along the side surface of the housing portion is formed on the side surface of the housing portion. Since it is arranged in the contour shape, it is possible to reduce a possibility that the protruding corner portion is caught when the used device is housed in the battery housing portion.

Further, according to the present invention, as described in claim 2, since the notch is provided at the longitudinal end of the fusion allowance, the bent corner is formed by forming a bent portion. The occupied volume does not increase as compared with the case where the is arranged in the side profile of the accommodation portion. Furthermore, according to the present invention, as described in claim 3, since the fusion allowance has a substantially trapezoidal shape, in order to arrange the protruding corner portion in the side profile of the housing portion, the fusion allowance is reduced. Even if a notch is provided at the longitudinal end, the desired moisture permeation resistance substantially the same as the conventional one can be maintained.

Further, according to the present invention, as described in claim 4, since the rounded corner is formed at the corner, the corner at the time of being housed in the battery housing part of the equipment to be used may be caught. This can be further reduced. According to the present invention, as described in claim 5, a roundness is formed in a plane corner portion where a pair of bent lines of the fusion allowance bent along a pair of mutually adjacent side surfaces in the housing portion intersect. Therefore, the sealed battery can be smoothly attached to and detached from the equipment to be used.

[Brief description of the drawings]

FIG. 1 is an overall perspective view and a side view showing a first embodiment according to the present invention.

FIG. 2 is an overall perspective view and a side view showing a second embodiment according to the present invention.

FIG. 3 is an overall perspective view and a main part enlarged plan view showing a third embodiment according to the present invention.

FIG. 4 is an overall perspective view and a side view showing a conventional sealed battery.

[Explanation of symbols]

10, 20, 30 Sealed battery 11, 21, 31 Notch 14, 24, 34 Package for sealed battery 17A, 17B, 17C, 17D, 27A, 27B, 27C, 27D, 37A, 37B, 37C, 37D
Melting allowance 18, 28, 38 Housing section 19A, 19B, 29A, 29B, 39A, 39B Outer corner 30A Roundness 81 Power generation element

Claims (5)

[Claims] 1. A power generating element in which a positive electrode and a negative electrode are stacked via an electrolyte layer, and a sealed battery package for housing the power generating element, wherein inner surfaces of the sealed battery package are fused to each other. A sealed battery in which the power generation element is housed and sealed by the fusion allowance, and wherein the fusion allowance is bent along a side surface of a housing section that houses the power generation element, A sealed battery, wherein a protruding corner portion is disposed within a side profile of the housing portion. 2. The sealed battery according to claim 1, wherein a notch is provided at a longitudinal end of the fusion margin. 3. The sealed battery according to claim 2, wherein said fusion allowance has a substantially trapezoidal shape. 4. The sealed battery according to claim 1, wherein the protruding corner is rounded. 5. A method according to claim 1, wherein said fusion allowances are bent along a pair of mutually adjacent side surfaces of said housing portion, and roundness is formed at a corner of a plane at which a broken line of each of said fusion allowances intersects. The sealed battery according to claim 1.