Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Flat-type unit cell and specific unit cell components
Reexamination Certificate
2000-12-13
2003-03-11
Kalafut, Stephen (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Flat-type unit cell and specific unit cell components
C429S176000, C429S181000, C429S007000
Reexamination Certificate
active
06531246
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plate-shaped battery and an electronic apparatus. In particular, the invention relates to a method of sealing an electrode lead line of a battery and applying a covering laminate film to a plate-shaped battery.
2. Background to the Invention
FIG. 1
is a perspective view of the outer appearance of a conventional thin plate-shaped battery which is charged with and discharges battery energy. Typical examples include for instance a nickel-cadmium battery, a nickel-hydrogen battery, a lithium ion battery or the like.
FIG. 2
is a cross sectional view along the line A-A′ of the plate-shaped battery in FIG.
1
.
FIG. 3
is a cross sectional schematic view of a battery core.
In the figures, reference numeral
81
denotes a thin plate-shaped battery which is a battery formed in a thin shape such as a nickel-cadmium battery, a nickel-hydrogen battery, a lithium ion battery or the like; reference numerals
2
,
3
respectively denote positive and negative electrode lead lines which are the input and output terminals of the plate-shaped battery
1
;
2
a
,
3
a
denote positive and negative electrode terminals of an internal battery, respectively;
2
aa
,
3
bb
denote the sheet-shaped positive and negative electrodes of the internal battery, respectively; and
82
denotes a separator interposed between the sheet-shaped positive electrode
2
aa
and negative electrode
3
bb.
Reference numerals
5
,
9
each denote a metallic foil comprised by a metallic material such as aluminum which covers the internal battery;
4
,
6
,
8
,
10
each denote a polymer resin such as polyethylene, polypropylene, polyethylene terephthalate, which is adapted to increase the weak mechanical strength of the metallic foil and which covers the metallic foil in order to prevent direct damage to the metallic foil
5
from the exterior.
11
comprises an external sheet which is a single sheet which is applied to the resins
4
,
6
on the top and bottom of the metallic foil
5
and which covers the battery interior of the plate-shaped battery
1
;
12
is an external sheet which comprises a single sheet which is applied to the resins
8
,
10
on the top and bottom of the metallic foil
9
and which covers the battery interior of the plate-shaped battery
1
in the same way. Depending on a method of manufacture, the external sheets
11
,
12
can be formed in a single folded sheet;
7
denotes an adhesive material comprised of an insulating material such as resin which sandwiches the positive and negative electrode lead lines
2
,
3
, with the external sheet
11
and the external sheet
12
and which fixes the positive and negative electrode lead lines by sealing the terminal with heat fusion or welding.
As shown in
FIG. 3
, the sheet-shaped positive and negative electrodes
2
aa
,
3
bb
in the battery interior
81
a
of the plate-shaped battery are electrically connected respectively with the positive and negative terminals
2
a
,
3
a
. The sheet-shaped positive and negative electrodes
2
aa
,
3
bb
in the battery interior of the plate-shaped battery
81
are electrically connected respectively with the positive and negative terminals
2
a
,
3
a
and form the input and output terminals of the battery. As shown in
FIG. 2
, the peripheries of the battery lead lines
2
,
3
(see
FIG. 3
) are covered by external sheets
11
,
12
and sealed by heat fusion or welding using a separate resin from that forming the exterior sheet. The battery lead lines
2
,
3
are comprised of a thin straight plate.
As shown in
FIG. 3
, the battery interior
81
a
is a laminate structure formed of the sheet-shaped positive and negative electrodes
2
aa
,
3
bb
with a separator
82
there between. The laminated structure is filled with an electrolytic solution and the battery interior is completely sealed with a covering film.
The operation of the conventional battery
81
is described below.
The positive and negative electrodes lead lines
2
,
3
of the plate-shaped battery
1
mounted in an electronic apparatus are connected to an electronic apparatus which mounts electrical circuits comprised from various types of electrical components on a printed board. Thus a potential difference is generated with the electrical components and a current flows through both the electrode lead lines
2
,
3
.
In such a way, the conventional plate-shaped battery
81
which uses polymer resins
4
,
6
,
8
,
10
such as polyethylene, polypropylene, polyethylene terephthalate or the like, is covered in external sheets
11
,
12
comprised of aluminum foil, for example. The foil comprises three layers interposing metallic foils
5
,
9
comprised of aluminum which has few pinholes and high flexibility. However, although the terminals of the electrode lead lines
2
,
3
are sealed with the external sheets
11
,
12
, the peripheries of the electrode lead lines
2
,
3
are sealed by welding using an adhesive material separate from the polymer resins
4
,
6
,
8
,
10
which comprise the laminate film.
Since the conventional plate-shaped battery
81
is structured as discussed above, the metallic foils
5
,
9
which are formed from a large surface area aluminum sheet in the aluminum laminated film which covers the plate-shaped battery
81
are not connected with the electrode of the plate-shaped battery
81
and thus have a floating electric potential. Since the electric potential fluctuates, the problem has arisen that the electrical circuit, which supplies the electrical energy of the battery, and the interior battery
81
a
, which forms the battery core stored in the laminate film, are not used as an electrical shield (magnetic shield, electrostatic shield).
The further problem has arisen that in spite of the fact that the polymers
4
,
6
,
8
,
10
such as polyethylene, polypropylene, or polyethylene terephthalate has a dielectric constant, the external sheets
11
,
12
comprised by an aluminum laminated film or the like which contains the polymers
4
,
6
,
8
,
10
are not used as a single electric component such as a condenser or an antenna.
The conventional plate-shaped battery
81
has a sealed structure complicated by the fact that a separate sealing resin
7
to the laminated film must be provided. Since an adhesive material
7
solely employed as a sealing resin for the sealed section is used, sealing is difficult.
Since the electrode lead lines
2
,
3
each comprise a thin straight plate, the adhesion of the electrode lead lines
2
,
3
and the external sheets
11
,
12
comprising the laminated film is weak and the problem has arisen that forward and backwards motion in the direction of electrode lead line detachment is facilitated.
SUMMARY OF THE INVENTION
The present invention is proposed to solve the above problems and has the object of providing a plate-shaped battery using a metallic foil such as aluminum in the laminated film as an electrical shield and antenna. A laminated film containing resin having a dielectric constant is used as an electrical component such as a condenser.
A further object of the present invention is to increase the mechanical strength of the external terminal and to electrically connect the external terminal at the same time as well as fixing the plate-shaped battery to an electronic apparatus in order to determine the capacity of the condenser.
The present invention has a simplified structure and a plate-shaped battery is proposed with improved adhesion in which the lead lines do not move forwards and backwards in a detaching direction.
The plate-shaped battery of the present invention is provided with a laminated film of laminated polymer resin and metallic foil which seals the positive and negative electrode terminals as well as covering the electrical core. The metallic foil is electrically connected with the positive and negative poles of the battery core.
The laminated film has conventionally not been used as an electrical component. However, with such a structure, it is possible to use
Hanafusa Kiyoshi
Ishida Hiroichi
Kalafut Stephen
Rothwell Figg Ernst & Manbeck
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