JP2001126701A - Laminated polymer electrolytic cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-capacity laminated polymer electrolytic cell. SOLUTION: A laminated polymer electrolytic cell comprises a positive electrode, a negative electrode and an electrode laminate of a structure laminated by interposing a polymer electrolyte between the positive electrode and the negative electrode, and is formed by carrying out connection of a lead portion of the positive electrode and an end portion of a positive electrode terminal in a direction other than a direction extracting the positive electrode terminal, while carrying out a connection of a lead portion of the negative electrode and an end portion of a negative electrode terminal in a direction other than the direction for extracting the negative electrode terminal to fold the connection portion of the lead portion of the positive electrode and the end portion of the positive electrode terminal and the connection portion of the lead portion of the negative electrode and the end portion of the negative electrode terminal in the surface direction of the electrode laminate, to extract an opposite end portion of the positive electrode terminal and an opposite end portion of the negative electrode terminal to the outside of the cell.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacked polymer electrolyte battery, and more particularly, to a stacked polymer electrolyte battery suitable for use as a power source for portable electronic devices, electric vehicles, road leveling, and the like.

[0002]

2. Description of the Related Art In a polymer electrolyte battery, the electrodes and the electrolyte can be made into a sheet shape, whereby A4
It is possible to manufacture a battery having a large area and a thin shape such as a plate and a B5 plate, and it is possible to apply the battery to various types of thin products. In particular, batteries using polymer electrolytes have excellent safety and storage properties, including liquid leakage resistance, and are thin and flexible, so that batteries that match the shape of equipment can be designed to date. Has features not found in

[0003] This polymer electrolyte battery usually uses a laminate film in which an aluminum foil is used as a core material and a heat-fusible resin film serving as an adhesive layer is provided on the inner surface side as an exterior material. Then, a thin sheet-type battery is completed by sealing an electrode laminate obtained by laminating a plurality of sheet-shaped electrodes and a plurality of polymer electrolyte layers with an exterior material.

Meanwhile, in the conventional laminated polymer electrolyte battery, when taking out the positive electrode terminal and the negative electrode terminal, the lead portion of the positive electrode and one end of the positive electrode terminal are connected along the direction of taking out the positive electrode terminal. The other end of the terminal is taken out of the battery as it is, and the lead of the negative electrode and one end of the negative terminal are connected along the direction of taking out the negative terminal, and the other end of the negative terminal is left as it is in the battery. I was taking it out.

[0005]

However, in the case described above, as shown in FIG. 10, a bundle of the lead portions of a plurality of stacked electrodes and a weld white (T in FIG. 10) are used.
Is large), the internal volume for accommodating power generation elements such as electrodes is reduced, and there is a problem that a high-capacity stacked polymer electrolyte battery cannot be obtained.

Accordingly, an object of the present invention is to solve the above-mentioned problems in the prior art and to provide a high-capacity stacked polymer electrolyte battery.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a laminated polymer electrolyte battery having an electrode laminate having a structure in which a positive electrode and a negative electrode are laminated with a polymer electrolyte interposed between them, The connection with one end of the positive terminal is made in a direction different from the direction in which the positive terminal is taken out,
The connection between the negative electrode lead and one end of the negative electrode terminal is performed in a direction different from the direction in which the negative electrode terminal is taken out, and the connection between the positive electrode lead and one end of the positive electrode terminal and the negative electrode lead The connection portion between the first electrode and one end of the negative electrode terminal is folded back in the surface direction of the electrode laminate, and the other end of the positive electrode terminal and the other end of the negative electrode terminal are taken out of the battery. Reduces the internal volume of the battery that has been deprived of the shiro for stacking the lead parts and the welding shiro for welding the laminated body of those lead parts to one end of the electrode terminal. The above-mentioned subject has been achieved by increasing the filling amount of, thereby achieving high capacity.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a positive electrode is manufactured by forming a positive electrode mixture layer on at least one surface of a positive electrode current collector. It is provided by leaving the exposed portion of the positive electrode current collector without forming the positive electrode mixture layer in a part. However, the lead portion of the positive electrode may be provided on the positive electrode by means other than the above. The positive electrode current collector and the positive electrode mixture may have a known structure. For example, an aluminum foil is particularly suitably used as the positive electrode current collector.

The negative electrode is formed by forming a negative electrode mixture layer on at least one surface of the negative electrode current collector. Usually, the lead portion is formed on a part of the negative electrode current collector during the production of the negative electrode. It is provided by leaving an exposed portion of the negative electrode current collector without forming a layer. However, the lead portion of the negative electrode may be provided by means other than the above. The negative electrode current collector and the negative electrode mixture layer may have a known configuration. For example, a copper foil is particularly preferably used as the negative electrode current collector.

[0010] The polymer electrolyte is the same as the conventional one.
For example, the above-mentioned polymer electrolyte can be used.
As an electrolytic solution for forming, for example, dimethyl carbonate
, Diethyl carbonate, methyl ethyl carbonate
G, methyl propionate, ethylene carbonate, pro
Pyrene carbonate, butylene carbonate, γ-butyl
Lolactone, ethylene glycol sulfite, 1,2
-Dimethoxyethane, 1,3-dioxolan, tetrahi
Drofuran, 2-methyl-tetrahydrofuran, diethyl
Organic solvents such as toluene, for example, LiClO_Four, L
iPF₆, LiBF_Four, LiAsF₆, LiCF_ThreeSO
_Three, LiC_FourF₉SO_Three, LiCF_ThreeCO_Two, Li_TwoC
_TwoF_Four(SO_Three)_Two, LiN (CF_ThreeSO_Two)_Two, Li
C (CF _ThreeSO_Two)_Three, LiC_nF_{2n + 1}SO_Three(N ≧
2), LiN (RfOSO_Two)_Two[Rf is full here
Dissolving inorganic ion salts such as
Is used, and the above electrolyte is
As a gelling component for gelling, for example,
Vinylidene fluoride, polyethylene oxide, polyacrylic
Ronitrile, vinylidene fluoride-propylene hexafluoride
Heating linear polymers such as polymers
After dissolving in more electrolytic solution, cooling
Polymers that gel liquids, such as dipentaerythri
Actinic rays such as tall hexaacrylate (eg, ultraviolet
Double bonds polymerizable by electron beam, electron beam, etc.) per molecule
Containing two or more monomers and predominantly monomer or prepolymer
A crosslinkable composition or the like is used.

Usually, since the electrode laminate is formed in a rectangular shape, the connection between the lead portion of the positive electrode and one end of the positive electrode terminal is made on a side different from the direction in which the positive electrode terminal is taken out (for example, the side from which the positive electrode terminal is taken out). The connection between the lead of the negative electrode and one end of the negative electrode terminal is also different from the direction in which the negative electrode terminal is taken out (for example, the side from which the negative electrode terminal is taken out). (A side in a direction orthogonal to the side of the image and a side in the opposite direction).

[0012]

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

Example 1 First, the preparation of a positive electrode and a negative electrode used in Example 1 and the preparation of an electrolyte containing a gelling component will be described first.

Preparation of positive electrode: LiCoO as positive electrode active material
₂ 80 parts by weight of acetylene black 5 parts by weight of conductive additive, a polyvinylidene fluoride 5 parts by weight of the N- methylpyrrolidone as a binder and mixed uniformly as a solvent, to prepare a positive electrode mixture-containing paste . This positive electrode mixture-containing paste is applied to both surfaces of a positive electrode current collector made of an aluminum foil having a thickness of 20 μm, dried, and subjected to a calendering process to reduce the thickness of the positive electrode mixture layer so that the total thickness becomes 130 μm. The area of the positive electrode mixture layer forming part was adjusted to 70
A positive electrode was prepared by cutting the sample to a size of mm × 40 mm.
However, in preparing the positive electrode, the positive electrode mixture-containing paste was not applied to the end of the aluminum foil in the long side direction, and the exposed portion of the aluminum foil having a width of 7 mm and a length of 20 mm was left. The portion was used as a lead portion for connection to a positive terminal or the like. FIG. 1 schematically shows a cross-sectional view of this positive electrode. As shown in FIG.
Is formed by forming a positive electrode mixture layer 1b on both sides of a positive electrode current collector 1a, and its lead portion 1c is formed by applying a positive electrode mixture-containing paste to a part of the aluminum foil constituting the positive electrode current collector 1a. Instead, the aluminum foil is exposed.

Preparation of Negative Electrode A: Graphite 90 as negative electrode active material
Parts by weight, 8 parts by weight of CARBOTRON P (trade name, low crystalline carbon manufactured by Kureha Chemical Industry Co., Ltd.) and 15 parts by weight of polyvinylidene fluoride as a binder are mixed uniformly using N-methylpyrrolidone as a solvent. A negative electrode mixture-containing paste is prepared, applied to both surfaces of a negative electrode current collector made of a copper foil having a thickness of 10 μm, dried, and then subjected to a calendering process so that the total thickness of the negative electrode mixture layer is 130 μm. Was adjusted and cut so that the area of the negative electrode mixture layer forming portion was 72 mm × 42 mm, to produce a negative electrode. Also, in producing the negative electrode, the negative electrode mixture-containing paste was not applied to the end of the copper foil in the long side direction, and the exposed portion of the copper foil having a width of 7 mm and a length of 20 mm was left. Is a lead portion for connection with a negative electrode terminal or the like. The negative electrode A thus manufactured is a so-called double-sided coated negative electrode in which a negative electrode mixture layer is formed on both surfaces of a negative electrode current collector. FIG. 2 schematically shows a cross-sectional view of the negative electrode A. As shown in FIG. 2, the negative electrode A has a negative electrode mixture layer 2b on both surfaces of a negative electrode current collector 2a.
The lead portion 2c is formed by exposing the copper foil without applying the negative electrode mixture-containing paste on a part of the copper foil constituting the negative electrode current collector 2a. In the drawings, the negative electrode A and a negative electrode B described later are denoted by the same reference numeral 2.

Preparation of Negative Electrode B: The same negative electrode mixture-containing paste as in the case of the above-described negative electrode A was applied to one surface of a negative electrode current collector made of a copper foil having a thickness of 10 μm, dried, and calendered. The thickness of the negative electrode mixture layer was adjusted so that the thickness became 70 μm, and the area of the portion where the negative electrode mixture layer was formed was 72 mm × 4.
This was cut to 2 mm to produce a negative electrode B. In producing the negative electrode B, the paste containing the negative electrode mixture was not applied to the end in the long side direction of the copper foil, and the width was 7 mm and the length was 20 mm.
The exposed portion of the copper foil was left, and the exposed portion of the copper foil was used as a lead portion for connection with a negative electrode terminal or the like. The negative electrode B thus produced is a so-called single-sided coated negative electrode in which the negative electrode mixture layer is formed only on one side of the negative electrode current collector. FIG. 3 schematically shows a cross-sectional view of the negative electrode B.
As shown in FIG. 3, the negative electrode B is manufactured by forming the negative electrode mixture layer 2b on only one surface of the negative electrode current collector 2a.

Preparation of electrolyte solution containing gelling component: volume ratio of propylene carbonate to ethylene carbonate 1: 1
As an initiator, 2,4,4 was dissolved in an electrolyte prepared by dissolving 1.22 mol / l of LiPF _{6 in} a mixed solvent of
6-trimethylbenzoyldiphenylphosphine oxide (trade name: Lucirin TPO, manufactured by BSF Japan Co., Ltd.)
Wt% and dissolved therein, and dipentaerythritol hexaacrylate was added to the mixture at a concentration of 6 minutes before the start of use.
The mixture was added and mixed so as to obtain a weight percent, thereby preparing an electrolytic solution containing a gelling component. The electrolytic solution containing the gelling component is simply expressed as “gelling component-containing electrolytic solution” as described above.

The positive electrode prepared as described above is wrapped with a nonwoven fabric serving as a support for the polymer electrolyte layer, the positive electrode and the support are integrated, and the whole is impregnated with an electrolyte containing a gelling component to form a gel. Thus, a polymer electrolyte holding positive electrode was obtained.
The negative electrode was impregnated with a gelling component-containing electrolytic solution without being wrapped with a nonwoven fabric, and gelled to obtain a polymer electrolyte-holding negative electrode. The details of the manufacturing method are described below.

Preparation of Polymer Electrolyte-Supported Positive Electrode: As a support, a polybutylene terephthalate nonwoven fabric having a thickness of 30 μm and a basis weight of 12 g / m ² [MB1230, manufactured by NKK Corporation]
(Trade name)] was used.

Then, the positive electrode mixture layer and the lead portion of the positive electrode are formed so as to have a thickness of 50 μm and a width of 3 mm.
Was adhered from both sides to prevent short circuit and maintain the strength of the terminals. Also, after covering the entire surface of the portion of the lead portion used for connection with the positive electrode terminal with a heat release tape that loses the adhesiveness of the adhesive surface due to heat,
The positive electrode is placed on the left side of the center of the polybutylene terephthalate nonwoven fabric in the longitudinal direction, and the right side is folded back to cover the positive electrode. : Policyr, Fuji Impulse Co., Ltd.
And a bag made of a polybutylene terephthalate nonwoven fabric as a support, and the two were brought into close contact to integrate the positive electrode and the support. The positive electrode unit in which the positive electrode and the support are integrated is immersed in the gelling component-containing electrolyte for 1 minute under reduced pressure to impregnate the positive electrode unit with the gelling component-containing electrolyte, and then put in a polyethylene bag. And sealed. Next, from both sides of the polyethylene bag, Fusion U
Using an ultraviolet irradiator manufactured by V Systems Japan Co., Ltd., irradiate ultraviolet rays at an illuminance of 1 W / cm ² for 10 seconds,
The monomer component in the electrolytic solution was polymerized, and the electrolytic solution was gelled to obtain a gel polymer electrolyte. The positive electrode holding the polymer electrolyte layer is taken out of the bag, the hot peeling tape is peeled from the portion of the lead portion used for connection with the positive electrode terminal by blowing hot air at 150 ° C. to obtain a polymer electrolyte holding positive electrode. Was.

Preparation of Polymer Electrolyte-Containing Negative Electrode A: A polyimide tape having a thickness of 50 μm and a width of 3 mm is attached to both sides of the negative electrode A prepared as described above so as to extend over the negative electrode mixture layer forming portion and the lead portion. To prevent short circuits and maintain the strength of the terminals. After covering the entire surface of the portion of the lead portion used for connection with the negative electrode terminal with a heat release tape that loses the adhesiveness of the adhesive surface due to heat, the negative electrode A was decompressed into the gelled component-containing electrolytic solution. After immersion for 1 minute in the lower part to impregnate the electrolytic solution containing the gelling component, the resultant was put in a polyethylene bag and sealed. Next, ultraviolet light was applied to both sides of the polyethylene bag at a rate of 1 W using an ultraviolet irradiation device manufactured by Fusion UV Systems Japan Co., Ltd.
Irradiation was performed for 10 seconds at an illuminance of / cm ² to polymerize the monomer components in the electrolytic solution and gel the electrolytic solution to obtain a gel polymer electrolyte. The negative electrode A holding the gelled polymer electrolyte is taken out of the bag, and hot air of 150 ° C. is blown to a portion of the lead portion used for connection with the negative electrode terminal, thereby peeling off the thermal release tape from the portion. A was obtained.

Preparation of polymer electrolyte-holding negative electrode B: A polyimide tape having a thickness of 50 μm and a width of 3 mm is attached to both sides of the negative electrode B formed as described above so as to extend over the negative electrode mixture layer forming portion and the lead portion. To prevent short circuits and maintain the strength of the terminals. Further, after covering all surfaces of a portion of the lead portion used for connection with the negative electrode terminal with a heat release tape which loses the adhesiveness of the adhesive surface due to heat, the negative electrode B was decompressed into the gelled component-containing electrolytic solution. After immersion for 1 minute in the lower part to impregnate the electrolytic solution containing the gelling component, the resultant was put in a polyethylene bag and sealed. Next, from the outside of the polyethylene bag, ultraviolet rays were irradiated at 1 W / c by using an ultraviolet irradiation device manufactured by Fusion UV Systems Japan Co., Ltd. on the side where the negative electrode mixture layer forming portion of the negative electrode B was arranged.
Irradiation was performed for 10 seconds at an illuminance of m ² to polymerize the monomer components in the electrolyte and gel the electrolyte to form a gel polymer electrolyte. The negative electrode B holding the gelled polymer electrolyte is taken out of the bag, and a hot air of 150 ° C. is blown to a portion of the lead portion used for connection with the negative electrode terminal, thereby peeling off the thermal peeling tape from the portion, and the polymer electrolyte holding negative electrode. B was obtained.

Next, five polymer electrolyte-holding positive electrodes prepared as described above and a polymer electrolyte-holding negative electrode A4 were prepared.
Sheets and two polymer electrolyte-holding anodes B are prepared, and a polymer electrolyte-holding anode B, a polymer electrolyte-holding cathode, a polymer electrolyte-holding anode A, a polymer electrolyte-holding cathode, a polymer electrolyte-holding anode A, a polymer electrolyte-holding cathode, and a polymer electrolyte-holding anode A, a polymer electrolyte holding positive electrode, a polymer electrolyte holding negative electrode A, a polymer electrolyte holding positive electrode, and a polymer electrolyte holding negative electrode B were laminated in this order to obtain an electrode laminate.
At this time, the negative electrode mixture layer forming portions of the two polymer electrolyte-holding negative electrodes B were laminated such that both faced the inside of the electrode laminate. That is, the two negative electrode current collectors made of a copper foil having a thickness of 10 μm of the polymer electrolyte holding negative electrode B were arranged so as to face the outer surface of the electrode laminate. In this electrode laminate, since the polymer electrolyte holding positive electrode and the polymer electrolyte holding negative electrode are stacked, the polymer electrolyte held by the positive electrode and the polymer electrolyte held by the negative electrode are interposed between the positive electrode and the negative electrode. In particular, the positive electrode and the negative electrode are laminated in a state in which the internal pores of the polybutylene terephthalate nonwoven fabric disposed as a support around the positive electrode and the polymer electrolyte are present at high density around the pores.

This electrode laminate will be described with reference to FIG. 4. The electrodes laminated to form this electrode laminate are:
As described above, the positive electrode holds the polymer electrolyte and the negative electrode holds the polymer electrolyte. As a result, the polymer electrolyte is interposed between the positive electrode and the negative electrode. The description will be made on the assumption that the polymer electrolyte 3 is interposed between the polymer electrolyte 2 and the polymer electrolyte 2. That is, in the electrode laminate shown in FIG. 4, a negative electrode 2 (this negative electrode 2 is based on a negative electrode B, that is, a single-sided coated negative electrode) is disposed on the lowermost side, and a polymer electrolyte 3 is placed thereon. Through,
Positive electrode 1, negative electrode 2, positive electrode 1, negative electrode 2, positive electrode 1, negative electrode 2, positive electrode 1, negative electrode 2, positive electrode 1, negative electrode 2 (this negative electrode 2 is based on negative electrode B, ie, a single-sided coated negative electrode. All of the layers except the two negative electrodes 2 in the outer layer are stacked in the order of the negative electrode A, that is, based on the double-sided coated negative electrode. In FIG. 4, the positive electrode 1 and the negative electrode 2
Although the polymer electrolyte 3 is shown in white, the illustration of the polymer electrolyte 3 is omitted in the following figures.

For the positive electrode terminal, a clad material of aluminum and nickel having a width of 5 mm and a thickness of 0.1 mm was used, and one end of the positive electrode terminal was welded to the positive electrode lead of the electrode laminate. Time 75msec, pressure 2kg / cm
^2. Ultrasonic welding was performed under the condition of amplitude of 60%. For the negative electrode terminal, a clad material of copper and nickel having a width of 5 mm and a thickness of 0.1 mm was used, and one end of the negative electrode terminal and the laminate of the negative electrode lead portion were welded for 120 m.
sec, pressure 2kg / cm ² , amplitude 60%
Ultrasonic welding under the following conditions. This state is schematically shown in FIG.

As shown in FIG. 5, the laminate of the positive electrode lead portion 1c and one end of the positive electrode terminal 5 are connected at a side B orthogonal to the direction A in which the positive electrode terminal 5 is taken out, and the negative electrode lead portion 2c Of the negative electrode terminal 6 (the direction in which the negative electrode terminal 6 is taken out is the same direction as the direction in which the positive electrode terminal 5 is taken out).

After the connection, the connection between the laminate of the positive electrode lead portion and one end of the positive electrode terminal 5 and the connection between the laminate of the negative electrode lead portion and one end of the negative electrode terminal 6. As shown in FIG. 6, each portion is bent in the plane direction of the electrode laminate 10, and the other end of the positive electrode terminal 5 and the other end of the negative electrode terminal 6 extend from the side A of the electrode laminate 10 to the outside of the battery. Pulled out towards. Then, as described above, the electrode laminate to which the positive electrode terminal and the negative electrode terminal are attached is sealed with an exterior material, and is finished into a square laminated polymer electrolyte battery having an outer shape of 85 mm × 50 mm.

As shown in FIG. 7, the exterior material used for sealing the electrode laminate is composed of a three-layer laminate film of a protective film 4a, a metal foil 4b, and a heat-fusible resin film 4c. Then, the protective film 4
A 30 μm-thick nylon film is used as a, a 50 μm-thick aluminum foil is used as the metal foil 4b, and a 30 μm-thick modified polyolefin film is used as the heat-fusible resin film 4c. The nylon film prevents the aluminum foil from being damaged or corroded, the aluminum foil prevents moisture or gas from permeating, and the modified polyolefin film acts as an adhesive layer. The exterior material 4 is used for sealing the electrode laminate 2.
Are used, and both have the same configuration, but one of them is formed in a container with a flange in advance so as to easily accommodate the electrode laminate, and the other is in the form of a plate, each of which is a modified polyolefin. The modified polyolefin films are sealed by heating the joints thereof by heat-sealing the modified polyolefin films to each other, with the film being on the inner surface side and arranged around the electrode laminate.

FIG. 8 is a plan view of the laminated polymer electrolyte battery manufactured as described above. Although the positive electrode terminal 5 and the negative electrode terminal 6 are taken out in the same direction, there is usually a gap of 15 mm between them, and under normal conditions, they do not come into contact and cause a short circuit.

FIG. 9 is an enlarged cross-sectional view of a portion of the laminated polymer electrolyte battery from which the positive electrode terminal is taken out, that is, an enlarged cross-sectional view taken along line XX of FIG. However, FIG. 9 will be described later in detail in comparison with FIG. 10 based on Comparative Example 1 described later.

COMPARATIVE EXAMPLE 1 The connection between the laminate of the positive electrode lead portion and one end of the positive electrode terminal and the connection between the laminate of the negative electrode lead portion and one end of the negative electrode terminal were made. A laminated polymer electrolyte battery was produced in the same manner as in Example 1, except that the operation was performed in the same direction as the take-out direction. However, as will be apparent from the description below, the battery of Comparative Example 1 cannot have a larger space inside the battery than the battery of Example 1, so that the size of the positive electrode was 62 mm × 40 mm, The size had to be reduced to 64 mm × 42 mm as compared with Example 1. FIG. 10 shows an enlarged cross-sectional view of the portion of the battery of Comparative Example 1 from which the positive electrode terminal is taken out.

As is clear from a comparison between FIG. 10 showing the portion of the battery of Comparative Example 1 where the positive electrode terminal is taken out and FIG. 9 showing the portion of the battery of Example 1 where the positive electrode is taken out, the battery of Example 1 has 2 parts. The space inside the battery formed by the sheets 4 and 4 is large, and almost all of the space is filled with a power generating element composed of a positive electrode, a negative electrode, a polymer electrolyte and the like.
On the other hand, in the battery of Comparative Example 1, the lead portion 1c of the positive electrode was used.
When connecting the laminate of the above and the positive electrode terminal 5, the lead portion 1c
Since the battery inner volume is consumed by the welding shiro (portion indicated by T in FIG. 10) for connecting the shiro of the stacked body and the stacked body of the lead portion 1c thereof to one end of the positive electrode terminal 5, the electrode The amount of filling of the power generation element such as is reduced. That is, the battery of Example 1 can achieve a higher capacity than the battery of Comparative Example 1 corresponding to a conventional product.

Table 1 shows the capacity (discharge capacity when discharged at 20 ° C. to a final voltage of 3 V) of the battery of Example 1 and the battery of Comparative Example 1 together with the positive electrode size, the negative electrode size, and the total battery height.

[0034]

[Table 1]

As is clear from the results shown in Table 1, the battery of Example 1 has a higher capacity than the battery of Comparative Example 1,
The increase in the total battery height was also small and remained in a range where there was virtually no problem.

[0036]

As described above, according to the present invention, a high capacity laminated polymer electrolyte battery can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a positive electrode using a laminated polymer electrolyte battery according to Example 1 of the present invention.

FIG. 2 is a cross-sectional view schematically showing a negative electrode A used in the laminated polymer electrolyte battery of Example 1 of the present invention.

FIG. 3 is a cross-sectional view schematically showing a negative electrode B used in the laminated polymer electrolyte battery of Example 1 of the present invention.

FIG. 4 is a cross-sectional view schematically showing an electrode laminate used for the laminated polymer electrolyte battery of Example 1 of the present invention.

FIG. 5 schematically illustrates a connection state between a lead portion of a positive electrode and a positive electrode terminal and a connection state between a lead portion of a negative electrode and a negative electrode terminal during a manufacturing process of the stacked polymer electrolyte battery of Example 1 of the present invention. It is a perspective view.

FIG. 6 is a diagram showing a connection portion between a lead portion of a positive electrode and a positive electrode terminal and a connection portion between a lead portion of a negative electrode and a negative electrode terminal during the manufacturing process of the stacked polymer electrolyte battery according to the first embodiment of the present invention. It is a perspective view which shows the state bent in the direction typically.

FIG. 7 is a cross-sectional view schematically illustrating an exterior material used for the laminated polymer electrolyte battery of Example 1 of the present invention.

FIG. 8 is a plan view schematically showing the laminated polymer electrolyte battery of Example 1 of the present invention.

9 is a diagram schematically illustrating a portion of a positive electrode terminal taken out of the laminated polymer electrolyte battery of Example 1 of the present invention, and is an enlarged view of a cross section taken along line XX of FIG. 8;

FIG. 10 is a cross-sectional view schematically showing a positive electrode terminal extraction portion of the laminated polymer electrolyte battery of Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode 1a Positive electrode collector 1b Positive electrode mixture layer 1c Lead part 2 Negative electrode 2a Negative electrode collector 2b Negative electrode mixture layer 2c Lead part 3 Polymer electrolyte 4 Outer material 4a Protective film 4b Metal foil 4c Heat-fusible resin film 5 Positive terminal 6 Negative terminal 10 Electrode laminate

Claims (1)

[Claims] 1. A laminated polymer electrolyte battery having a positive electrode, a negative electrode, and an electrode laminate having a structure in which a polymer electrolyte is interposed between them, wherein a lead portion of the positive electrode and one end of a positive electrode terminal are connected to each other. The connection is made in a direction different from the direction in which the positive terminal is taken out, and the connection between the negative electrode lead and one end of the negative terminal is made in a direction different from the direction in which the negative terminal is taken out. The connection portion with one end of the terminal and the connection portion between the lead portion of the negative electrode and one end of the negative electrode terminal are folded back in the surface direction of the electrode laminate to form the other end of the positive electrode terminal and the other end of the negative electrode terminal. A laminated polymer electrolyte battery having an end taken out of the battery.