JP2001052659A - Layer-built polymer electrolyte battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polymer electrolyte battery having a high reliance upon the performance capable of preventing poor workmanship of joining of an electrode terminal part even in case vibrations are given to the battery or a shock is given thereto, for example when it falls down. SOLUTION: A laminated bunch of electrodes composed of a plurality of sheet-form positive electrodes 1 of such a structure that a positive electrode active material containing layer 1b is provided on at least one surface of an electricity collector 1a made of metal, a plurality of sheet-form negative electrodes 2 of such a structure that a negative electrode active material containing layer is provided on at least one surface of electricity collector la made of metal, and sheet-form polymer electrolyte layers 3 interposed between them 1 and 2, wherein is sealed by an armouring consisting of an armouring vessel 4 and seal lid 5. That portion of the armouring vessel 4 which accommodates the electrode terminal part is made with such a depth as gradually decreasing outward from the portion accommodating the body of the electrode bunch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated polymer electrolyte battery, and more particularly, to a laminated polymer electrolyte battery having high reliability in battery performance.

[0002]

2. Description of the Related Art A characteristic of a polymer electrolyte battery is that the electrodes and the polymer electrolyte layer constituting the electrode group are formed in a thin sheet shape, and a battery which is easily thinned and has excellent flexibility can be obtained. The thin electrode of the polymer electrolyte battery is obtained by forming an active material-containing layer on at least one surface of a current collector from a thin metal foil or the like by applying and drying an active material-containing paste.From the viewpoint of productivity, Usually, a long continuous sheet is used as a raw material. Then, when incorporated in the battery, the electrode is formed into a desired shape by punching a long raw material, and at this time, the active material-containing layer forming portion and the active material-containing layer-free portion are formed. The narrow portion where the active material containing layer is not formed is used as a lead portion of the electrode.

However, as described above, the lead portion of the electrode is made of a very thin metal foil or the like. Therefore, it is difficult to use the lead as it is as the electrode terminal serving as the external terminal of the battery because of its low mechanical strength. Is liable to be damaged and lacks practicality. Therefore, one end of the electrode terminal separately manufactured with a metal plate thicker than the lead of the electrode is joined to the lead of the electrode, and the other end of the electrode terminal is used for connection to a battery-using device outside the battery. Is common.

In order to produce a higher capacity battery in this polymer electrolyte battery, a plurality of positive electrodes and a plurality of negative electrodes are laminated with a polymer electrolyte layer interposed therebetween, and the laminated electrode is formed. The group was sealed with the same exterior material as described above to produce a laminated polymer electrolyte battery.
In such a laminated polymer electrolyte battery, since the electrode leads also have a plurality of leads, the lead body is not directly bonded to the electrode terminals, and the lead body is interposed between the lead portions and the electrode terminals. In many cases, when a lead body is used in such a manner, one end of the lead body is joined to the laminate of the lead portion, and the other end is joined to one end of the electrode terminal. I have.

In the above-mentioned laminated polymer electrolyte battery, when the number of laminated electrodes is large, a laminate film as an exterior material is formed in advance as a dish-shaped exterior container, and an electrode terminal portion is included therein. The laminated electrode group is accommodated, and a similar laminated film is used as a sealing lid for the above-mentioned outer container while keeping the plate shape.

Conventionally, as shown in FIGS. 6 and 7, the outer container for accommodating the above-described laminated electrode group has a depth corresponding to the thickness of the laminated electrode group, and has the same overall depth. Therefore, although there is no particular problem with respect to the laminated electrode group main body, the electrode terminal portions and the like that are thinner than the laminated electrode group main body are not fixed by the exterior body, and are displaced by vibration or dropping, and the Insufficient bonding caused the battery performance to deteriorate, and a sufficiently reliable battery could not be obtained.

In other words, since the depth of the outer container is provided in accordance with the thickness of the laminated electrode group, the laminated electrode group is accommodated in the outer container, and the opening is closed when the opening is closed with the sealing lid. The electrode group main body is pressed by the atmospheric pressure and is completely fixed by the outer body composed of the outer container and the sealing lid. The electrode terminal portion (the electrode terminal portion is a lead portion of an electrode, an electrode terminal, an electrode terminal). When a lead body for connecting the lead portion and the electrode terminal is used, the whole or a part including the lead body is thinner than the stacked electrode group main body, and thus is entirely fixed by the outer package. not,
As a result, vibrations and drops cause displacement, which causes poor bonding of the electrode terminal portions, thereby lowering the battery performance. As described above, it was not possible to obtain a stacked polymer electrolyte battery having high battery performance reliability. .

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and by devising the shape of the outer container, the laminated electrode group including the electrode terminals is formed into an outer container. An object of the present invention is to provide a laminated polymer electrolyte battery that is tightly fixed by an outer package including a sealing portion and has high battery performance.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the depth of an outer container for accommodating an electrode terminal portion associated with a laminated electrode group is increased from the portion for accommodating the laminated electrode group main body. By gradually reducing the depth toward the outside, the entire laminated electrode group including the electrode terminals is tightly fixed in the outer package consisting of the outer container and the sealing lid, and a highly reliable laminated polymer electrolyte battery with high battery performance is provided. It was done.

[0010]

1 and 2 show an outer container used in the present invention. In the outer container 4, the main body 4a
Is a portion for accommodating the laminated electrode group main body, occupies most of the outer container 4, and the main body 4a has the deepest depth,
And uniform. An inclined portion 4b is provided between the main body portion 4a and the flange portion 4d, and the inclined portion 4b is a portion for accommodating the electrode terminal portion, which is outside the portion for accommodating the laminated electrode group main body. It gradually becomes shallower toward. As a result, when the laminated electrode group is housed in an outer container together with the electrode terminals and the opening of the outer container is sealed with a sealing lid, the laminated electrode group body is securely fixed by the main body portion 4a of the outer container, In addition, since the electrode terminal portion is also tightly fixed by the inclined portion 4b, when the battery is vibrated or the battery falls, it is possible to prevent the electrode terminal portion from being defectively joined, and to prevent the occurrence of the defective connection. A decrease in battery performance is suppressed, and a laminated polymer electrolyte battery having high reliability in battery performance can be obtained.

[0011] A laminate film having a heat-fusible film in a layer on the inner surface side during use is usually used for the outer container or the sealing lid. Such a laminated film is used for the outer container or the sealing lid. When used, FIG.
As shown in the figure, a stacked electrode group is housed in the outer container 4,
The sealing lid 5 is put on it, and the flange 4
At d, the outer container 4 and the sealing lid 5 are thermally fused to seal the laminated electrode group with the outer body composed of the outer container 4 and the sealing lid 5, thereby completing a stacked polymer electrolyte battery. As the laminate film constituting the outer container 4 and the sealing lid 5, for example, a laminated film having a three-layer structure composed of a nylon film or a polyester film-aluminum film-modified polyolefin film is used, and the modified polyolefin constituting the modified polyolefin film is used. Is a heat-sealing resin, and when the laminated electrode group is sealed in the exterior body composed of the exterior container 4 and the sealing lid 5, both the exterior container 4 and the sealing lid 5 have the inner surface side, that is, the facing of both. The outer container 4 and the sealing lid 5 are arranged such that the modified polyolefin film is positioned on the surface side.
And the joint surface is sealed by heat fusion.

However, in the portion where the electrode terminal portion is interposed,
It is difficult to obtain a high degree of hermeticity only by heat-sealing the modified polyolefin film of the outer container 4 and the modified polyolefin film of the sealing lid 5, and the sealing material 10 made of a heat-fusible resin such as an ionomer Is preferably arranged.

In the outer container 4, reference numeral 4c denotes a side wall. In the conventional outer container 4 shown in FIGS. 6 and 7, there are four side walls 4c. In the outer container 4 of the present invention, the four side walls are provided. One of the side wall portions 4c is the inclined portion 4b. The inclination angle of the inclined portion 4b is preferably 10 ° to 45 °, particularly preferably 12 ° to 35 °.

In the present invention, the positive electrode, the negative electrode, the polymer electrolyte, etc. may be of the usual construction in this type of battery, and both the outer container and the sealing lid may be constituted by a laminated film as in the prior art. The outer container may be formed by processing a stainless steel plate, a nickel plate, a nickel-plated iron plate, or the like.

The electrode is usually produced by applying an active material-containing paste to a current collector made of a metal foil or the like and drying it to form an active material-containing layer on at least one surface of the current collector. The active material-containing paste and the active material-containing layer may be any as long as they contain an active material as an essential component, and may further contain a binder and, if necessary, a conductive auxiliary and a thickener. Good.

[0016]

Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to only these examples.

Example 1 First, as shown in the following, a positive electrode, a negative electrode, and a polymer electrolyte layer serving as a separator were prepared.

Positive electrode: LiCoO ₂ as a positive electrode active material
After dry mixing 40 parts by weight of the powder, 8 parts by weight of flake graphite powder as a conductive aid and 5 parts by weight of polyvinylidene fluoride (hereinafter abbreviated as “PVdF”) powder as a binder, 1.22 M (mol) was further added. / L) LiPF
Ethylene carbonate / propylene carbonate containing ₆ (hereinafter "EC / PC" abbreviated) (50/50) solution 25 parts by weight of the added active substance-containing paste prepared by mixing, thickness 20μm as a collector Is applied to both sides of the aluminum foil to a thickness of 75 μm, and then heated at 120 ° C. for 20 minutes to form a positive electrode active material-containing layer on both sides of the aluminum foil (PVdF is melted by the above heating, and the temperature is lowered). When the PVdF decreases, the PVdF gels, and at that time, the whole is taken into PVdF, including the solvent, and becomes non-fluidized to form a flexible positive electrode active material-containing layer), thereby producing a sheet-shaped positive electrode. This positive electrode is a so-called double-sided coated positive electrode. Separately from this, as a positive electrode to be disposed on the outermost layer of the laminated electrode group, the above-mentioned positive electrode active material-containing paste is applied to one surface of an aluminum foil, and heated in the same manner as above to form a current collector. By forming a positive electrode active material-containing layer only on one side of the above, a so-called one-side coated positive electrode was also prepared. In each case, however, the positive electrode active material-containing paste was not applied to the portion to be the lead portion, and the aluminum foil was exposed. E above
C / PC (50/50) is ethylene carbonate (E
This indicates that the mixed solvent has a ratio of C) to propylene carbonate (PC) of 50:50 by volume.

Negative electrode: 40 parts by weight of spheroidal graphite powder, 4 parts by weight of flake graphite powder and 5 parts by weight of PVdF powder are dry-mixed, and then EC containing 1.22 M of LiPF ₆ is further added.
The negative electrode active material-containing paste prepared by adding and mixing 5 parts by weight of a / PC (50/50) solution is mixed with a current collector having a thickness of 2
After coating on both surfaces of a 0 μm copper foil to a thickness of 75 μm, respectively, and heating at 120 ° C. for 20 minutes to form a negative electrode active material-containing layer on both surfaces of the copper foil, a sheet-like so-called double-sided coated negative electrode is produced. did. Also, as in the case of the positive electrode,
As a negative electrode to be arranged on the outermost layer of the stacked electrode group, the paste containing the negative electrode active material is applied to one surface of a copper foil, and heated in the same manner as above to form a negative electrode active material on only one surface of the copper foil serving as a current collector. By forming the containing layer, a so-called single-sided coated negative electrode was produced. However, in any of the negative electrodes, the active material-containing paste was not applied to the portion to be the lead portion, and the copper foil was exposed.

Polymer electrolyte layer: After mixing 50 parts by weight of 2-ethoxyethyl acrylate, 13 parts by weight of triethylene glycol dimethacrylate and 33 parts by weight of ethylene glycol ethyl carbonate methacrylate, 5 parts by weight of benzoyl peroxide and 1.22 M
EC / PC (50/50) solution 35 containing LiPF ₆
The weight part was added and mixed, and after the bayoyl peroxide was completely dissolved, a polybutylene terephthalate nonwoven fabric having a thickness of 60 μm and a basis weight of 30 g / m ² was immersed therein. After the solution completely infiltrates the nonwoven fabric, the immersed nonwoven fabric is 75μ
sandwiched between two glass plates having a gap of
It heated at 20 degreeC for 20 minutes, and produced the sheet-shaped polymer electrolyte layer.

The positive electrode uses three double-sided coated positive electrodes, one single-sided coated positive electrode, and the negative electrode uses three double-sided coated negative electrodes.
One single-sided negative electrode was used, and the polymer electrolyte layer was 7
Using the positive electrode, the negative electrode, the polymer electrolyte layer,
A negative electrode, a polymer electrolyte layer, a positive electrode,..., A negative electrode, a polymer electrolyte layer, and a positive electrode were sequentially laminated with four positive electrodes, four negative electrodes, and seven polymer electrolyte layers to prepare a laminated electrode group.

FIG. 3 schematically shows a plan view of the above-mentioned laminated electrode group and its electrode terminals. FIG. 4 shows a main part of a laminated polymer electrolyte battery produced by housing and sealing the above-mentioned laminated electrode group in an outer package composed of an outer package and a sealing lid.

First, prior to the description of the above-mentioned laminated electrode group and the laminated polymer electrolyte battery, the outer container will be described with reference to FIGS.
mm, a laminated film having a three-layer structure of a nylon film, an aluminum film, and a modified polyolefin film. The overall dimensions of the film are 116 mm × 92.5 m.
m, the size of the main body 4a is 95 mm × 80 mm, the depth is 2.5 mm, and the width of the flange 4d is the slope 4b.
Is wide, 7 mm, and the other part is 4 mm. The inclined portion 4b is deepest at a position adjacent to the main body portion 4a and has a depth of 2.5 mm, but gradually decreases outward from the inclined portion 4b, and becomes 8 mm away from a position adjacent to the main body portion 4a. Has a depth of 0, that is, reaches the flange portion 4d, and has an inclination angle of about 17 °.

Next, the laminated electrode group and its electrode terminals will be described with reference to FIG.
4, the polymer electrolyte layer 7 and the negative electrode 4 are visible as a flat surface as shown in FIG.
(Lead portion of the negative electrode 2). The positive electrode 1, the negative electrode 2, and the polymer electrolyte layer 3 will be described below with reference to FIG. In FIG. 3, the outer container is shown by a dashed line in order to clarify the positional relationship between the stacked electrode group and the like and the outer container.

The positive electrode 1 is at the uppermost portion and is shown with a dot, under which the polymer electrolyte layer 3 is arranged, and further below this, the negative electrode 2 is arranged. The area of the negative electrode 2 is larger than that of the positive electrode 1, the area of the polymer electrolyte layer 3 is larger than that of the negative electrode 2, and the polymer electrolyte layer 3 also has a function of separating the positive electrode 1 from the negative electrode 2.

The lead portion 1c of the positive electrode 1 is constituted by an exposed portion of an aluminum foil which is a current collector of the positive electrode 1, and four positive electrodes 1 are used. Therefore, as shown in FIG. At the time of joining with the lead body 8, the laminate is formed into four sheets.

The lead member 8 connects the lead portion 1c and the positive electrode terminal 6 and is made of an aluminum ribbon having a thickness of 100 μm. One end of the lead member 8 is connected to the lead portion 1c of the positive electrode 1. The other end of the lead body 8 is joined to one end of the positive electrode terminal 6 by ultrasonic welding.

The positive electrode terminal 6 is formed of a nickel ribbon having a thickness of 40 μm, and one end thereof is provided with an outer container 4 and a sealing lid 5.
At the junction with the lead 8 made of aluminum
And the other end is drawn out of the joint between the outer container 4 and the sealing lid 5 and is used as a so-called external terminal for connection to a battery-powered device. Although not shown, this positive electrode terminal 6
It is preferable to wrap an insulating tape such as a polyimide tape around the joint between the lead and the lead body 8 so that short circuit due to burrs does not occur.

The outer container 4 is composed of a three-layer laminated film of a nylon film-aluminum film-modified polyolefin film as described above, and the sealing lid 5 is also made of a nylon film-aluminum film-modified polyolefin film. The laminated electrode group main body is formed of a three-layer laminated film. The laminated electrode group main body is housed in the main body 4 a of the outer container 4, and the electrode terminals are housed in the inclined portion 4 b of the outer container 4.

That is, as shown in FIG. 4, the laminated body of the lead portion 1c of the positive electrode 1, the junction between the laminated body of the lead portion 1c and one end of the lead body 8, and a part of the lead body 8 are formed. The positive electrode terminal 6 and the lead body 8 housed in the inclined portion 4b
Is joined at the joint between the outer container 4 and the sealing lid 5, and the joint is not shown in FIG. Is provided, whereby the inside of the battery is sealed. That is, at the junction between the outer container 4 and the sealing lid 5 where the junction between the positive electrode terminal 6 and the lead body 8 does not intervene, the thermal fusion between the modified polyolefin film of the outer container 4 and the modified polyolefin film of the sealing lid 5 is performed. Although the inside of the battery can be hermetically sealed by the attachment, at the portion where the junction between the positive electrode terminal 6 and the lead body 8 is interposed, the fused polyolefin film of the outer container 4 and the modified polyolefin film of the sealing lid 5 are thermally fused. Since a gap is likely to be formed only by the above, the sealing material 10 is provided so that a high degree of sealing inside the battery can be ensured. As the sealing material 10, a heat-fusible resin such as an ionomer is preferably used. In FIG. 4 and FIG. 8 showing a main part of the battery of Comparative Example 1 described later, the polymer electrolyte layer 3 is provided only between the uppermost negative electrode 2 and the positive electrode 1 disposed therebelow. Without the reference number 3,
The members interposed between the positive electrode 1 and the negative electrode 2 adjacent to the positive electrode 1 are all polymer electrolyte layers. Similarly, the current collector 1a of the positive electrode 1 is limited to only the uppermost positive electrode 1 of the four positive electrodes 1. Although not denoted by reference numeral 1a, the members arranged at the center of the so-called double-sided coated positive electrode 1 and the members arranged at the lower side in the so-called single-sided coated positive electrode 1 are all current collectors of the positive electrode 1, Further, the current collector 2a of the negative electrode 2 is also denoted by reference numeral 2a only for one of the four negative electrodes 2 that is the negative electrode 2.
Although not shown, a member arranged at the center of the so-called double-sided coated negative electrode 2 and a member arranged at the upper side of the so-called single-sided coated negative electrode 2 are all current collectors of the negative electrode 2. Further, FIG. 4 shows a state in which the laminated electrode group is placed in the outer container 4 as shown in FIG. 2 and the sealing lid 5 is arranged and sealed at normal pressure, so that the inclined portion 4b is finished linearly. However, in an actual battery, pressure reduction (vacuum) sealing is performed in order to enhance the adhesion between the stacked electrode group and the outer container 4 or the sealing lid 5 and to fix the stacked electrode group in the outer container 4 caused thereby. In order to stop, the intermediate portion of the originally linear inclined portion 4b is concaved inward and finished in a curved shape. In such a case, the inclination angle (gradient) of the inclined portion 4b becomes difficult to understand. Point A (part corresponding to the end of the negative electrode 2) and B in FIG.
The angle formed by the straight line connecting the points (the portion corresponding to the end of the lead portion 1c of the positive electrode 1) with the sealing lid 5 is defined as the inclination angle of the inclined portion 4b.

As described above, the joint between the positive electrode terminal 6 and the lead body 8 is arranged at the joint between the outer container 4 and the sealing lid 5 because nickel and aluminum are located between them. If the electrolytic solution intervenes, a local battery is formed to cause corrosion of aluminum, so that the electrolytic solution does not intervene between the nickel positive electrode terminal 6 and the aluminum lead body 8.

That is, the positive electrode terminal 6 is made of nickel for convenience of joining with a battery-using device by soldering or the like, and the current collector of the positive electrode 1 is made of aluminum foil. Since both are made of aluminum, it is desirable to arrange the joint between the positive electrode terminal 6 and the lead body 8 at a position where the joint is not exposed to the electrolyte in order to avoid corrosion of aluminum due to the formation of a local battery. Because.

The lead portion 2c of the negative electrode 2 is constituted by an exposed portion of a copper foil, which is a current collector of the negative electrode 2, and four negative electrodes 2 are used. At the time of joining with the body 9, it is made into four laminated bodies.

The lead 9 on the negative electrode side is made of copper and connects the lead 2c of the negative electrode to the negative terminal 7. One end of the lead 9 is a laminate of the lead 2c of the negative electrode 2. And the other end of the lead body 9 is joined by ultrasonic welding of one end of the negative electrode terminal 7.

The above-mentioned laminated electrode group corresponds to a structure in which four unit cells each comprising a positive electrode 1, a polymer electrolyte battery 3 and a negative electrode 2 are laminated. One of the inner unit cells is taken out, and the main part is shown in FIG.

Since this unit cell is located inside the laminated electrode group, a so-called double-sided coated electrode is used for each of the positive electrode 1 and the negative electrode 2. As shown in FIG. 5, the positive electrode 1 serves as a current collector 1a. The positive electrode active material-containing layer 1b is formed on both sides of the aluminum foil, and the portion of the aluminum foil where the positive electrode active material-containing layer is not formed constitutes the lead portion 1c. The negative electrode 2 is a current collector 2a.
The negative electrode active material-containing layer 2b is formed on both surfaces of the copper foil as a part, and the portion of the copper foil where the negative electrode active material-containing layer is not formed constitutes the lead portion 2c.

It is to be noted that FIGS. 1 to 5 are all schematic diagrams, and the dimensions and ratios of the respective components are not always accurate. This is based on the fact that even a very thin member must be illustrated with a certain thickness.

Comparative Example 1 A laminated polymer electrolyte battery was manufactured in the same manner as in Example 1 except that the outer container shown in FIGS. 6 and 7 was used.

The laminated polymer electrolyte battery of Comparative Example 1 corresponds to a conventional laminated polymer electrolyte battery.
First, the outer container 4 used in Comparative Example 1 will be described. The outer container 4 used in Comparative Example 1 does not have the inclined portion 4b unlike the outer container 4 used in Example 1, and is different from the main unit 4a. It is composed of four side walls 4c and a flange 4d. Therefore, as shown in FIG. 8, an electrode terminal portion (specifically, a laminate of the lead portion 1c of the positive electrode 1, a joint portion between the laminate of the lead portion 1c and the lead member 8, and a part of the lead member 8) ) Is also housed in the main body 4a of the outer container 4 like the laminated electrode group main body, so that the laminated electrode group main body is firmly fixed, but the electrode terminal portion is too thin compared to the laminated electrode group main body. , A gap is formed between the lid 5 and the lid 5, and the lid 5 is not firmly fixed. As a result, when the battery is vibrated or the battery is dropped, poor bonding is likely to occur at the bonding portion of the electrode terminal portion.

The battery of Example 1 and the battery of Comparative Example 1 were each made 100 pieces, and they were subjected to the following vibration test, and the change in internal resistance before and after the vibration test was measured.
Table 1 shows the result of determining that the terminal connection increased by at least% was determined as a poor terminal connection.

That is, in the vibration test, the battery was fixed in a state where the battery was set up with the terminals facing upward, the amplitude was 4 mm, and the frequency was 1000 r.
Performed at pm for 60 minutes.

[0042]

[Table 1]

As shown in Table 1, the battery of Example 1 had a lower connection failure rate and higher battery performance reliability than the battery of Comparative Example 1.

In preparing the polymer electrolyte,
In addition to the cases described in the above examples, for example, a polymer that causes an electrolyte to gel by heating, a radical polymerizable unsaturated polyester, or a radical polymerizable acrylic epoxy acrylate, urethane acrylate, Alternatively, a photocurable resin such as polyester acrylate, alkyd acrylate, or silicon acrylate that is polymerized using ultraviolet light or an electron beam to gel the electrolytic solution may be used.

[0045]

As described above, according to the present invention, even when a shock is applied to the battery, such as when the battery is vibrated or the battery is dropped, it is possible to prevent the occurrence of poor connection of the electrode terminal portions. It was possible to provide a laminated polymer electrolyte battery having high performance reliability.

[Brief description of the drawings]

FIG. 1 schematically shows an outer container used for a laminated polymer electrolyte battery of the present invention, wherein (a) is a plan view thereof, and (b) is a cross-sectional view taken along line AA of (a). It is.

FIG. 2 is a schematic cross-sectional view taken along the line BB of FIG. 1 (a), schematically illustrating an outer container used for the laminated polymer electrolyte battery of the present invention.

FIG. 3 is a plan view schematically showing a stacked electrode group and an electrode terminal portion associated therewith in the stacked polymer electrolyte battery of Example 1 of the present invention.

FIG. 4 is a cross-sectional view schematically illustrating a main part of the laminated polymer electrolyte battery according to Example 1 of the present invention.

FIG. 5 is a cross-sectional view schematically illustrating a main part of one unit cell taken out of the stacked electrode group used in the stacked polymer electrolyte battery according to the first embodiment of the present invention.

FIGS. 6A and 6B schematically show an outer container used in a conventional laminated polymer electrolyte battery, wherein FIG. 6A is a plan view thereof, and FIG. 6B is a plan view taken along line CC of FIG. It is sectional drawing.

FIG. 7 schematically shows an outer container used for a conventional laminated polymer electrolyte battery.
It is sectional drawing in the -D line.

FIG. 8 is a cross-sectional view schematically showing a main part of a conventional laminated polymer electrolyte battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode 1a Current collector 1b Positive electrode active material containing layer 1c Lead part 2 Negative electrode 2a Current collector 2b Negative electrode active material containing layer 2c Lead part 3 Polymer electrolyte layer 4 Outer container 4a Body part 4b Inclined part 4c Side wall part 4d Flange part 5 Sealing lid 6 Positive electrode terminal 7 Negative electrode terminal 8 Lead body on the positive electrode side 9 Lead body on the negative electrode side 10 Sealing material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H011 AA01 AA04 CC02 CC06 CC10 DD05 DD13 EE04 KK03 5H029 AJ11 AK03 AL07 AM03 AM07 AM16 BJ04 BJ06 BJ12 DJ02 DJ05 DJ12 EJ12 HJ12

Claims (1)

[Claims] 1. A sheet-like positive electrode comprising a positive electrode active material-containing layer formed on at least one surface of a metal current collector and a plurality of positive electrodes and a negative electrode active material provided on at least one surface of the metal current collector. A laminated electrode group formed by laminating a plurality of negative electrodes in the form of a sheet having a containing layer and a sheet-shaped polymer electrolyte layer interposed therebetween is sealed with an outer body comprising an outer container and a sealing lid. The laminated polymer electrolyte battery according to claim 1, wherein a depth of the outer container in a portion for accommodating the electrode terminal portion is gradually reduced outward from a portion for accommodating the laminated electrode group body. Polymer electrolyte battery.