JP2002298920A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain miniaturization, high energy density and cost reduction and to suppress short-circuiting. SOLUTION: This battery is provided with a battery element 2 formed by laminating a negative electrode material 4 and a positive electrode material 5 through a sheet-like electrolyte member 6 made of a polymeric organic material, and a sheathing material 3 for sealing the battery element 2, leading outside one end part of a terminal part provided at a current collector of the negative electrode material 4 and positive electrode material 5. The battery element 2 is formed dividing a plurality of strip element parts provided in line forming cutout parts in the longitudinal direction of the whole application region of a negative electrode active material layer 7 and a positive electrode active material layer 11. The negative electrode material 4 and positive electrode material 5 are jointed to both faces of the electrolyte member 6 with the respective cutout parts positioned correspondingly, and bent through the cutout parts and sealed with the casing material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery having a sheet-like electrolyte made of a polymer organic material.

[0002]

2. Description of the Related Art In recent years, a large number of portable electronic devices such as a camera-integrated video tape recorder, a portable telephone, and a portable computer have appeared, and their size and weight have been reduced. As a power source for these portable electronic devices, a battery with a high energy density is required. As batteries satisfying such a demand for higher energy density, there are, for example, secondary batteries that can be repeatedly charged and discharged, such as a lithium ion secondary battery, a nickel hydride battery, and a nickel cadmium battery. Among these secondary batteries, lithium ion secondary batteries are characterized by high energy density, and therefore, researches for reducing the size and weight are being actively conducted.

On the other hand, as a battery for achieving high energy density, there is a battery using a light metal such as lithium, sodium and aluminum as a negative electrode active material. These batteries have been receiving attention as well as lithium ion secondary batteries.

[0004] In these batteries, for example, a negative electrode material and a positive electrode material each having a current collector coated with an electrode active material are laminated through an electrolyte made of a high-molecular organic material to constitute a battery element. The element is sealed in an exterior material such as a laminate film, for example, to achieve miniaturization and high energy density.

[0005]

By the way, in the above-mentioned battery, when the battery element is bent, for example, to reduce the size and increase the energy density, an electrode material or an electrolyte is formed at the bent portion of the battery element. May be deformed. As a result, in the battery, there is a problem that the electrode active material falls off the current collector at the bent portion of the battery element, the battery capacity is reduced, and the increase in energy density is hindered. In addition, in the battery, there is a problem that the electrode breaks through the electrolyte at the bent portion of the battery element to cause a short circuit. Further, in the battery, there is a problem that the bent part of the battery element becomes thicker than the parts of the other battery elements, which hinders miniaturization.

On the other hand, there is a method of connecting a plurality of battery elements in parallel and stacking them to reduce the size and increase the energy density. In this case, in the battery, a region for attaching a terminal for connecting the current collectors is required for the battery element, so that there is a problem that the assembly is complicated and the miniaturization is hindered. Further, the battery requires a terminal for connecting the current collector, and thus has a problem that the cost is increased.

Therefore, the present invention provides a compact, high-energy density, low-energy battery element when a battery element in which a negative electrode material and a positive electrode material are laminated via an electrolyte made of a polymer organic material is sealed in an exterior material. The present invention has been proposed for the purpose of providing a battery in which the cost is reduced and the occurrence of a short circuit is suppressed to improve the reliability.

[0008]

A battery according to the present invention that achieves the above object has a negative electrode material and a positive electrode material each formed by applying an electrode active material to a long current collector and comprising a high-molecular organic material. A long battery element that is laminated via a sheet-like electrolyte member, and an exterior material that seals the battery element by leading one end of a terminal portion provided on the current collector of the negative electrode material and the positive electrode material to the outside. It has. In the battery element, the negative electrode material and the positive electrode material are formed at least at one end of each of the current collectors with a current collector exposed portion formed of an uncoated portion of the electrode active material, and the entirety of the electrode active material application region. A cutout portion is formed in the longitudinal direction to divide a plurality of strip-shaped element portions continuously provided in the current collector exposure portion. In the battery, the negative electrode material and the positive electrode material are joined to both sides of the electrolyte member with the respective cutouts corresponding to the respective cutouts, and are bent through the cutouts to form a battery element, and the battery element is sealed in an exterior material. Become.

According to the battery according to the present invention having the above-described structure, since the negative electrode material and the positive electrode material are bent at the notches, the electrode active material is separated from the current collector at the bending position of the battery element. Dropping is prevented. According to the battery, since the battery is bent at the notch, the negative electrode material and the positive electrode material are prevented from breaking through the electrolyte at the bending position of the battery element. Further, according to the battery, since the battery is bent at the notch, the bending position of the battery element can be suppressed from being thicker than the other battery element.
Therefore, according to the battery, the battery element can be formed in any shape, reduced in size and thickness, and sealed in an exterior material, so that the shape can be freely adjusted and high energy density can be achieved. Improvement is achieved.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. The battery 1 shown in FIG. 1 as an embodiment includes a battery element 2 serving as a power generating element and a long exterior material 3 made of, for example, a laminated film that seals the battery element 2 as described in detail below. Become. The battery element 2 has a structure in which a negative electrode material 4 and a positive electrode material 5 are laminated via a sheet-shaped electrolyte member 6 made of a polymer organic material.

As shown in FIG. 2, the negative electrode material 4 is formed by forming a negative electrode active material layer 7 containing a negative electrode active material on both main surfaces of a negative electrode current collector 8. The negative electrode material 4 has a substantially band shape,
At one end of the negative electrode current collector 8 in the longitudinal direction, a negative electrode current collector exposed portion 9 which is a portion where the negative electrode active material layer 7 is not applied is formed. In the negative electrode material 4, a negative electrode terminal portion 9 a serving as an external terminal is formed by extending a part of the long side end of the negative electrode current collector 8 of the negative electrode current collector exposure portion 9.

In the negative electrode material 4, the notch 10a extends in the longitudinal direction over the entire region where the negative electrode active material layer 7 is formed.
Are formed. In the negative electrode material 4, a first rectangular negative electrode material 4a and a second rectangular negative electrode material 4b having the same width are provided.
It is divided into. In the negative electrode material 4, a first strip-shaped negative electrode material 4 a and a second strip-shaped negative electrode material 4 b are connected in series at a negative electrode current collector exposed portion 9.

In the negative electrode material 4, the width of the notch 10 a is made larger than the thickness of the battery element 2. In addition, the negative electrode terminal portion 9a is not necessarily limited to extending a part of the negative electrode current collector exposure portion 9, and for example, a strip-shaped terminal such as copper, nickel, and stainless steel may be used as the negative electrode current collector exposure portion. 9 may be joined. In the negative electrode material 4, a notch is formed at one location as the notch 10a, but the number of notches is not necessarily limited to one location. For example, the area of the negative electrode material 4, the battery 1 to be manufactured, The number of notches may be determined in consideration of the size of the notch.

For example, when a lithium battery, a lithium ion secondary battery, or the like is manufactured, the negative electrode active material layer 7 can be doped with lithium metal, an alloy containing lithium metal, or doped or dedoped with lithium ions. Carbonaceous materials,
An inorganic material or the like that allows doping / dedoping of lithium ions is used. Note that the negative electrode active material layer 7 is not necessarily limited to the above-described negative electrode active materials, and a negative electrode active material suitable for a type of a battery to be manufactured can be used.

As the negative electrode active material, examples of alloys containing lithium metal include lithium-aluminum alloy, lithium-zinc alloy, lithium-tin alloy, lithium-indium alloy and the like. In the negative electrode active material, as a carbonaceous material capable of doping / dedoping lithium ions, for example, conductive polymers such as polyacetylene and polypyrrole, pyrolytic carbons, cokes such as pitch coke, needle coke and petroleum coke, and graphite , Non-graphitizable carbons, glassy carbons, organic polymer compound fired bodies obtained by firing organic polymers at an arbitrary temperature of 500 ° C. or more in an inert gas atmosphere or vacuum, carbon fibers, activated carbon, etc. Can be

Examples of the negative electrode active material include inorganic materials capable of doping and undoping lithium ions, such as oxides such as tin oxide, iron oxide and titanium oxide, siliconaceous materials or compounds thereof, and tin compounds. . The negative electrode current collector 8 is made of a metal foil such as copper.

In the negative electrode material 4, a coating solution obtained by adding a known binder and a known solvent as a binder to the above-described negative electrode active material is applied to both main surfaces of the negative electrode current collector 8 and dried. The negative electrode active material layer 7 is formed.

As shown in FIG. 3, the cathode material 5 has a cathode active material layer 11 containing a cathode active material formed on one main surface of a cathode current collector 12. The positive electrode material 5 has a substantially band shape, and a positive electrode current collector exposed portion 13 formed of an uncoated portion of the positive electrode active material layer 11 is formed at one longitudinal end of the positive electrode current collector 12. In the positive electrode material 5, the positive electrode current collector exposed portion 1
A positive electrode terminal portion 13a serving as an external terminal is formed by extending a part of a side end of the positive electrode current collector 12 in the longitudinal direction.

In the positive electrode material 5, the notch 10 is formed over the entire area where the positive electrode active material layer 11 is formed in the longitudinal direction.
b to a notch 10d are formed. In the positive electrode material 5, the formed cutouts 10 b to 10 d and the cutout 10 a formed in the negative electrode material 4 are formed with the same width. The positive electrode material 5 is divided into a first rectangular positive electrode material 5a to a fourth rectangular positive electrode material 5d having the same width.

In the positive electrode material 5, the notch 10b is
Is located between the strip-shaped positive electrode material 5a and the second strip-shaped positive electrode material 5b, and the notch 10c is formed between the second strip-shaped positive electrode material 5b and the third strip-shaped positive electrode material 5b.
The notch 10d is located between the third strip-shaped positive electrode material 5c and the fourth strip-shaped positive electrode material 5d. In the positive electrode material 5, a first strip-shaped positive electrode material 5 a to a fourth strip-shaped positive electrode material 5 d are connected in series at a positive electrode current collector exposed portion 13. In the positive electrode material 5, the width and length of the first to fourth strip-shaped positive electrode materials 5a to 5d are equal to the width of the first and second strip-shaped negative electrode materials 4a and 4b. And are divided so as not to be larger than the length.

In the positive electrode material 5, the width of the notches 10 b to 10 d is made larger than the thickness of the battery element 2. The positive electrode terminal portion 13a is not necessarily limited to extending a part of the positive electrode current collector exposure portion 13; for example, a band-shaped terminal such as aluminum is joined to the positive electrode current collector exposure portion 13. May be. In the positive electrode material 5, three notches are formed as the notches 10b to 10d, but the number of notches is not necessarily limited to three.
The number of notches may be determined in consideration of the area of the battery, the size of the battery 1 to be manufactured, and the like.

For example, when a lithium battery, a lithium ion secondary battery, or the like is manufactured, the positive electrode active material layer 11 is made of a material capable of doping and undoping lithium ions. In addition, the positive electrode active material layer 11 can use the positive electrode active material according to the kind of the battery to be manufactured, and is not particularly limited.

As the positive electrode active material, for example, TiS ₂ , Mo
Metal oxides and metal sulfides containing no lithium metal such as S ₂ , NbSe ₂ , V ₂ O _{5, and the} like, and a general formula LiXMO 2 (where M represents one or more transition metals, usually 0.05
x 1.10. ) And the general formula LiNi _P M1 _Q M2
_R O ₂ (where M1 and M2 are Al, Mn, Fe, C
O, Ni, Cr, Ti, Zn, or the like represents at least one kind of metal or a nonmetallic element such as P or B, and P + Q + R = 1. ), And the like.

In the positive electrode active material, it is preferable to use lithium cobalt oxide or lithium nickel oxide in that high voltage and high energy density can be obtained and cycle characteristics are excellent. In the positive electrode active material, for example, carbon salts such as lithium, nitrates, carbides, hydroxides, and the like, and carbonates, nitrates, oxides, hydroxides, and the like such as cobalt, manganese, and nickel are pulverized to a desired composition. A lithium transition metal composite oxide can be obtained by mixing and firing in an oxygen atmosphere at a temperature range of 600 ° C to 1000 ° C. In the positive electrode active material, a plurality of the above materials may be used in combination. In addition, the positive electrode current collector 1
For 2, a metal foil such as aluminum is used.

In the positive electrode material 5, a coating liquid obtained by adding a known binder and a known solvent to the above-described positive electrode active material is applied to one main surface of the positive electrode current collector 12, and dried to form a positive electrode active material. A layer 11 is formed.

As the electrolyte member 6, for example, an ion conductive material or the like having a sheet shape made of a polymer organic material is used.
Specifically, the electrolyte member 6 includes a polymer compound and a lithium salt as constituent components. In the electrolyte member 6, the polymer compound dissolves the electrolyte and exhibits conductivity, and the polymer compound that cannot dissolve the electrolyte has a property of being compatible with the solvent in which the electrolyte is dissolved, that is, the electrolyte solution. There are some that show sex. In the electrolyte member 6, the former is used as a solid electrolyte, and the latter is used as a gel polymer electrolyte.

In the electrolyte member 6, examples of the solid electrolyte include polyethylene glycol, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polypropylene oxide, polyvinyl alcohol, polyphosphazene, polysilane, and copolymers thereof in the main chain. Polymer compounds having a polyoxyethylene structure in the side chain and the like are used. In the electrolyte member 6, the solid electrolyte may be used by dissolving an electrolyte in the electrolyte. In the electrolyte member 6, these solid electrolytes may have a crosslinked structure. In the electrolyte member 6, as the gel polymer electrolyte, for example, polyvinyl chloride, polyacrylonitrile, polyethylene, polypropylene, polyester, polyacrylate, a copolymer thereof, or the like is used.

In the electrolyte member 6, the electrolyte and
For example, lithium, sodium, aluminum, etc.
Light metal salts are used. In the electrolyte member 6,
When configuring a lithium ion secondary battery, use an example of electrolyte
For example, LiBF₄, LiCLO₄, LiPF₆, LiA
sF₆, CF₃SO₃Li, (CF₃SO₂)₂NL
i, C₄F₉SO₃Li, CF₃CO₂Li, (CF₃
CO)₂NLi, C₆F ₅SO₃Li, C₈F₁₇SO
₃Li, (C₂F₅SO₂)₂NLi, (C₄F ₉SO
₂) (CF₃SO₂) NLi, (FSO)₂C₆F₄)
(CF₃SO₂) NLi, ((CF₃)₂CHOS
O₂)₂NLi, (CF₃SO₂)₃CLi, (C₆F
₃(CF₃)₂-3, 5)₄BLi, LiCF₃, Li
AlCl₄Or a combination of two or more
Used.

In the electrolyte member 6, as a solvent for dissolving the electrolyte, for example, carbonate compounds such as ethylene carbonate, propylene carbonate and N-methyloxazoline, ether compounds such as dioxane and diethyl ether, ethylene glycol dialkyl ether and propylene glycol dialkyl ether Or chain ethers such as polyethylene dialkyl ether or polypropylene glycol dialkyl ether, alcohols such as methanol, ethanol, ethylene glycol monoalkyl ether or propylene glycol monoalkyl ether, ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, glycerin, etc. Polyhydric alcohols such as acetonitrile, porpionitrile and Nitrile compounds such as Zonitoriru, aprotic polar substances such as dimethyl sulfoxide and sulfolane, water and the like alone or used by mixing two or more kinds.

It should be noted that the electrolyte member 6 is not necessarily limited to the use of the above-mentioned combination of the electrolyte and the solvent, but may be any suitable electrolyte for the type of battery to be manufactured. In the electrolyte member 6, the mixing ratio of the polymer compound and the electrolyte is arbitrarily set in terms of the weight ratio.

As shown in FIG. 4, in the battery element 2 configured as described above, the anode material 4 and the cathode material 5 are made of an electrolyte member 6.
Are fixed to both main surfaces by, for example, heat compression. The battery element 2 includes a first strip-shaped negative electrode material 4 a, a second strip-shaped negative electrode material 4 b, and a positive electrode material 5 in the negative electrode material 4.
The second strip-shaped positive electrode material 5b and the third strip-shaped positive electrode material 5c in FIG.

The battery element 2 has a notch 1 in the negative electrode material 4.
0a and the notch 10c in the positive electrode material 5 are positioned correspondingly. As shown in FIG. 5, the battery element 2 includes a negative electrode active material layer 7 formed on both main surfaces of a negative electrode current collector 8 and a positive electrode active material layer 11 formed on one main surface of a positive electrode current collector 12. Are positioned so as to face each other via the electrolyte member 6, and the notch 1
0a to the notch 10d are bent.

On the other hand, the packaging material 3 for enclosing the above-mentioned electronic element 2 is formed in a sheet shape by a multilayer heat-sealing type laminated film composed of, for example, a packaging protection layer, a metal layer, a heat sealing layer and the like. . In the exterior material 3, for example, a resin such as nylon is formed and used as an exterior protection layer. In the exterior material 3, for example, a metal foil such as aluminum, nickel, iron, and stainless steel is used as the metal layer. In the exterior material 3, for example, a thermoplastic plastic material such as polyethylene, polypropylene, or polyethylene terephthalate is formed and used as a heat-sealing layer.

The battery 1 including the above-described members has a structure in which the battery element 2 is wrapped and sealed by the outer package 3. In the battery 1, the negative electrode terminal portion 9 a applied to the negative electrode current collector 8 of the battery element 2 and the positive electrode terminal portion 13 a applied to the positive electrode current collector 12 face the outside of the exterior material 3. ing.

The battery 1 configured as described above has a structure in which the battery element 2 is bent at the notches 10a to 10d formed in the negative electrode material 4 and the positive electrode material 5. Thereby, in the battery 1, the battery element 2 can be easily bent into an arbitrary shape. In the battery 1, the battery element 2
Since the negative electrode active material layer 7 and the positive electrode active material layer 12 are prevented from dropping from the negative electrode current collector 8 and the positive electrode current collector 12 at the bent portions to deteriorate the battery capacity, the energy density is increased. Can be achieved. In battery 1,
It is possible to suppress a short circuit generated when the negative electrode material 4 and the positive electrode material 5 pierce the electrolyte member 6 at the bent portion of the battery element 2. In the battery 1, the bent portion of the battery element 2 is prevented from being thicker than the portions of the other battery elements, and downsizing can be achieved.

The battery 1 has the notch 10a of the negative electrode material 4 of the battery element 2 and the notch 10b to the notch 1b of the positive electrode material 5.
0d, without separating the negative electrode current collector exposed portions 9
And a structure in which the positive electrode current collector exposing portion 13 is electrically connected. In addition, the battery 1 is configured such that the negative electrode terminal portion 9a applied to the negative electrode current collector 8 of the battery element 2 and the positive electrode terminal portion 13a applied to the positive electrode current collector 12 face the outside of the exterior material 3 so that the battery 1 is The structure is a terminal. Thus, the battery 1 does not require terminals for connecting the negative electrode current collectors 8 and the positive electrode current collectors 12, and thus can be downsized. Moreover, in the battery 1, since terminals for electrical connection between the negative electrode current collectors 8 and between the positive electrode current collectors 12 are not required, the cost can be reduced.

Further, in the battery 1, since the negative electrode material 4 and the positive electrode material 5 are fixed to the electrolyte member 6 by heat compression and the like and then bent at the notches 10a to 10d, the negative electrode material 4 and the positive electrode material 5 can be bent even in an extremely curved state. The displacement between the material 4 and the positive electrode material 5 can be prevented. Thereby, in the battery 1, the deterioration of the battery capacity due to the displacement between the negative electrode material 4 and the positive electrode material 5 is suppressed, so that a high energy density can be achieved. In the battery 1, since the displacement between the negative electrode material 4 and the positive electrode material 5 is prevented, it is possible to configure a flexible battery element 2.

By the way, since the battery 1 has the flexibility of suppressing the deterioration of the battery capacity even when the battery 1 is greatly curved, and has flexibility, for example, a portable camera-integrated video tape recorder shown in FIG. 30 can be stored in the strap portion 30a or the like. Battery 1
Are the negative electrode terminal 9a and the positive electrode terminal 13
a is housed in the strap part 30a so as to be connected to a power supply connector part (not shown) of the portable camera-integrated video tape recorder 30.

Thus, the battery 1 can be used as a power supply for the portable camera-integrated video tape recorder 40 and a backup power supply for a power supply battery built in the portable camera-integrated video tape recorder 30. Battery 1 is
Since it is configured to be housed in the strap portion 30a attached to the portable camera-integrated video tape recorder 30, there is no obstruction and no uncomfortable feeling is caused.

The battery 1 does not require a space for accommodating the battery inside the portable camera-integrated video tape recorder 30, or constitutes a large-capacity battery power supply in a small space. be able to. Since the battery 1 constitutes a large-capacity battery power supply for the portable camera-integrated video tape recorder 30, even when the portable camera-integrated video tape recorder 30 is used for a long time, the capacity is insufficient. Generation can be suppressed.

Also, since the battery 1 has flexibility while suppressing deterioration of the battery capacity even when it is bent, for example, the strap portion 3 of the cellular phone 31 shown in FIG.
1a or the like. The battery 1 is connected to the strap section 3 such that the negative terminal section 9a and the positive terminal section 13a extending to the outside are connected to a power supply connector section (not shown) of the mobile phone 31.
1a. Also in this case, in the battery 1,
The above-described portable camera-integrated video tape recorder 30
As in the case where the mobile phone 31 is stored in the strap portion 30a, the size of the mobile phone 31 can be reduced, and a large-capacity battery power source can be configured for the mobile phone 31 to suppress occurrence of insufficient capacity.

Further, since the battery 1 has flexibility while suppressing deterioration of the battery capacity even when the battery 1 is bent, the battery 1 is housed in, for example, the strap portion 32a of the portable audio device 32 shown in FIG. Is done. The battery 1 is housed in the strap part 32 a so that the negative terminal part 9 a and the positive terminal part 13 a leading out are connected to a power supply connector part (not shown) of the portable audio device 32. Also in this case, in the battery 1, the portable audio device 32 can be reduced in size and the portable audio device 32 can be reduced in the same manner as when the battery 1 is stored in the strap portion 30 a of the portable camera-integrated video tape recorder 30. , A large-capacity battery power supply can be configured to suppress the occurrence of insufficient capacity.

Further, since the battery 1 has flexibility even when it is bent, the battery capacity is prevented from deteriorating, and since the battery 1 has flexibility, for example, the headphone receiver 3 shown in FIG.
3 is accommodated in the band portion 33a or the like. Battery 1 is housed in band portion 33 a such that negative electrode terminal portion 9 a and positive electrode terminal portion 13 a leading out are connected to a power supply connector portion (not shown) of headphone receiver 33.

In this case, in the battery 1, since the headphone receiver 33 is connected to the electronic device such as the above-mentioned portable audio device 32 via the audio output cord 34, the audio output to the electronic device is performed. It is a battery power supply for supplying electricity via the power cord 34. The battery 1 is housed in a headphone receiver 33 attached to the portable audio device 32, for example, so that it does not become an obstacle and does not cause discomfort.

The battery 1 does not require a space for accommodating a battery for an electronic device connected to the headphone receiver 33 via the audio output cord 34 or constitutes a large-capacity battery power supply in a small space. In addition, the size and weight of the electronic device can be reduced. The battery 1 has a low capacity even when the electronic device is used for a long time by configuring a large-capacity battery power supply for the electronic device connected to the headphone receiver 33 via the audio output cord 34. Can be suppressed. The battery 1 may be configured such that the above-described battery element 2 is directly housed in an electronic device and a part having a long shape attached to the electronic device. In this case, the same effect can be obtained.

In the battery 1 described above, the battery element 2
Are the negative electrode active material layers 7 formed on both main surfaces of the negative electrode current collector 8.
And the positive electrode active material layer 11 formed on one main surface of the positive electrode current collector 12 are positioned so as to face each other with the electrolyte member 6 interposed therebetween. The present invention relates to the structure of the battery element 2. Of course, it is not necessarily limited. For example, the battery element 4 shown in FIG.
0 is different from the structure of the battery element 2 in the above-described first embodiment in that the negative electrode 41 and the positive electrode 42 are
Has a completely opposite structure. That is, in the battery element 40, the negative electrode active material layer 44 is
And a positive electrode active material layer 46 formed on one main surface of the positive electrode current collector 47 and a positive electrode material 42 formed on both main surfaces of the positive electrode current collector 47. Since the battery element 40 includes the same members as those of the above-described battery element 2, detailed description of each member will be omitted.

In this case, as shown in FIG. 11, the negative electrode material 41 is formed by forming a negative electrode active material layer 44 containing a negative electrode active material on one main surface of a negative electrode current collector 45. The negative electrode material 41 is
The negative electrode current collector exposed portion 48, which has a substantially band shape, is formed at one end of the negative electrode current collector 45 in the longitudinal direction, and is formed of a portion where the negative electrode active material layer 44 is not applied. In the negative electrode material 41,
Negative electrode terminal portion 48 serving as an external terminal obtained by extending a part of the long side end of negative electrode current collector 45 of negative electrode current collector exposure portion 48
a is formed.

In the negative electrode material 41, the negative electrode active material layer 44
The notch 4 extends over the entire area where the
9a to notches 49c are formed. The negative electrode material 41 is divided into a first rectangular negative electrode material 41a to a fourth rectangular negative electrode material 41d having the same width. In the negative electrode material 41, the notch 49a is located between the first strip-shaped negative electrode material 41a and the second strip-shaped negative electrode material 41b, and the notch 49b is formed between the second strip-shaped negative electrode material 41b and the third strip-shaped negative electrode material 41b. The notch 49c is located between the strip-shaped negative electrode material 41c and the third strip-shaped negative electrode material 41d.

In the negative electrode material 41, a first strip-shaped negative electrode material 41 a to a fourth strip-shaped negative electrode material 41 d are continuously provided at a negative electrode current collector exposing portion 48. In the negative electrode material 41, the width of the notches 49 a to 49 c is larger than the thickness of the battery element 40. In addition, the negative electrode terminal 4
8a is not necessarily limited to extending a part of the negative electrode current collector exposing portion 48, and for example, a strip-shaped terminal such as copper, nickel, and stainless steel is joined to the negative electrode current collector exposing portion 48. Is also good. In the negative electrode material 41, three notches are formed as the notches 49a to 49c. However, the number of the notches is not necessarily limited to three. The number of notches may be determined in consideration of the above.

As shown in FIG. 12, the positive electrode material 42 has a positive electrode active material layer 46 containing a positive electrode active material formed on both main surfaces of a positive electrode current collector 47. The positive electrode material 42 has a substantially belt-like shape, and a positive electrode current collector exposed portion 50 including an uncoated portion of the positive electrode active material layer 46 at one end in the longitudinal direction of the positive electrode current collector 47.
Are formed. In the positive electrode material 42, a positive electrode terminal portion 50 a serving as an external terminal is formed by extending a part of a longitudinal end portion of the positive electrode current collector 47 of the positive electrode current collector exposure portion 50.

In the positive electrode material 42, the positive electrode active material layer 46
The notch 4 extends over the entire area where the
9d is formed. In the positive electrode material 42, the cutout portion 49 d formed in the negative electrode material 41 is formed.
a to the cutout portion 49c are formed with the same width. The positive electrode material 42 is divided into a first rectangular positive electrode material 42a and a second rectangular positive electrode material 42b having the same width. In the positive electrode material 42, the first strip-shaped positive electrode material 42a
And the second strip-shaped positive electrode material 41b is the positive electrode current collector exposed portion 50
It is installed continuously.

In the positive electrode material 42, the width and length of the first strip-shaped positive electrode material 42a and the second strip-shaped positive electrode material 42b are the same as those of the first strip-shaped negative electrode material 41a to the fourth strip-shaped negative electrode material. The width is divided so as not to be larger than the width and length of 41d. In the positive electrode material 42, the width of the cutout portion 49 d is set to be larger than the thickness of the battery element 40. Note that the positive electrode terminal portion 50a is connected to the positive electrode current collector exposure portion 50.
The present invention is not necessarily limited to extending a part of the terminal. For example, a band-shaped terminal made of aluminum or the like may be joined to the positive electrode current collector exposed portion 50. In the positive electrode material 41, a cutout is formed at one place as the cutout portion 49d, but the number of cutouts is not necessarily limited to one place. The number of chips may be determined.

As a third embodiment of the present invention, a battery 60 shown in FIG. 13 has a structure in which a battery element 61 is bent at a notch 62, then wound and sealed in an exterior material 63. That is, the battery 60 is wound after the negative electrode material 64 and the positive electrode material 65 of the battery element 61 are respectively fixed to both main surfaces of the electrolyte member 66 by, for example, heat compression and the like, bent at the notch 62, and wound. 63 is sealed. Since the battery element 61 and the outer package 63 of the battery 60 have the same members and configurations as those of the battery element 2 and the outer package 3 of the battery 1 described above, detailed description thereof will be omitted.

In the battery 60, the battery element 61 corresponds to FIG.
As shown in FIG. 4, the battery element 61 is wound in one of the long direction of the battery element 61 indicated by an arrow A in the figure and the short direction of the battery element 61 indicated by an arrow B in the figure. In the battery 60, the battery element 61 is configured such that the negative electrode material 64 and the positive electrode material 65
Is fixed by heat compression and the like, and then bent and wound at the notch 62, so that the negative electrode material 6 can be bent even in an extremely curved state.
4 and the positive electrode material 65 can be prevented from shifting.

As a result, in the battery 60, the negative electrode material 64 and the positive electrode material 65 are wound without displacement, so that the winding density can be improved and the battery capacity can be increased, so that the energy density can be increased. In the battery 60, since the deterioration of the battery capacity due to the displacement between the negative electrode material 64 and the positive electrode material 65 is suppressed, a higher energy density can be achieved. In the battery 60, since the displacement between the negative electrode material 64 and the positive electrode material 65 is prevented, it is possible to configure the battery element 61 having a flexible wound structure.

By the way, the battery 60 suppresses the deterioration of the battery capacity even when it is bent, and has flexibility. Therefore, similarly to the first embodiment, the portable electronic device described above is used. It is housed inside an elongated part such as an accessory attached to a portable electronic device.

Thus, the battery 60 can be used as a power source for these portable electronic devices and the like and a backup power source for a power source battery built in the electronic device. Since the battery 60 has the same form as the accessory attached to the portable electronic device, it does not become an obstacle and does not cause discomfort. The battery 60 eliminates the need for a space for accommodating the battery inside the portable electronic device or makes it possible to configure a large-capacity battery power supply in a small space.
The portable electronic device can be reduced in size and weight.

The battery 60 constitutes a large-capacity battery power supply, thereby suppressing shortage of capacity even when a portable electronic device is used for a long time. The battery 60
May be configured such that the battery element 31 is directly housed in a portable electronic device and a long part of an accessory attached to the portable electronic device. In this case, the same effect can be obtained.

[0059]

As described in detail above, according to the battery of the present invention, the battery element is formed by laminating the negative electrode material and the positive electrode material each having the elongated notch formed on the electrolyte member, and through the notch. Because of the bent structure, the electrode active material is prevented from dropping from the current collector at the bent position. Therefore, according to the battery of the present invention,
The deterioration of the battery capacity is suppressed, the energy density of the battery can be increased, and the short circuit of the battery that occurs at the bending position can be suppressed. ADVANTAGE OF THE INVENTION According to the battery which concerns on this invention, since the notch is formed in the bending position of a negative electrode material and a positive electrode material, a bending position does not become thicker than the site | part of another battery element, and can aim at miniaturization of a battery. It can be configured in any shape.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a battery according to the present invention.

FIGS. 2A and 2B are diagrams showing a configuration example of a negative electrode material provided in the battery, wherein FIG. 2A is a schematic plan view and FIG. 2B is a schematic side view.

FIGS. 3A and 3B are diagrams showing one configuration example of a positive electrode material provided in the battery. FIG. 3A is a schematic plan view, and FIG. 3B is a schematic side view.

FIG. 4 is a schematic sectional view showing one configuration example of a battery element of the battery.

FIG. 5 is a schematic cross-sectional view showing a state in which the battery element of the battery is bent at the notch.

FIG. 6 is a schematic perspective view showing a camera-integrated video tape recorder provided with the battery.

FIG. 7 is a schematic perspective view showing a mobile phone provided with the battery.

FIG. 8 is a schematic perspective view showing a portable audio device provided with the battery.

FIG. 9 is a schematic perspective view showing a headphone receiver including the battery.

FIG. 10 is a schematic cross-sectional view showing another configuration example of the battery element of the battery according to the present invention.

FIGS. 11A and 11B are diagrams showing another configuration example of the negative electrode material provided in the battery. FIG. 11A is a schematic plan view, and FIG. 11B is a schematic side view.

12 is a diagram showing another configuration example of the positive electrode material provided in the battery, wherein FIG. 12 (a) is a schematic plan view and FIG. 12 (b) is a schematic side view.

FIG. 13 is a longitudinal sectional view showing a state where a battery element of the battery is wound.

FIG. 14 is a schematic perspective view showing a battery element of the battery.

[Explanation of symbols]

1 battery, 2 battery element, 3 exterior material, 4 negative electrode material, 4
a first strip-shaped negative electrode material, 4b second strip-shaped negative electrode material,
5 positive electrode material, 5a first rectangular positive electrode material, 5b second rectangular positive electrode material, 5c third rectangular positive electrode material, 5d fourth rectangular positive electrode material, 6 electrolyte member, 7 negative electrode active material layer, 8
Negative electrode current collector, 9 Negative electrode current collector exposed portion, 9a Negative electrode terminal portion, 10a, 10b, 10c, 10d cutout portion, 11
Positive electrode active material layer, 12 positive electrode current collector, 13 positive electrode current collector exposed part, 13a positive electrode terminal part, 30 camera-integrated video tape recorder, 31a strap part, 31 mobile phone, 31a strap part, 32 portable audio equipment, 32a strap section, 33 headphone receiver, 33a band section, 34 audio output cord, 40
Battery element, 41 negative electrode material, 42 positive electrode material, 43 electrolyte member, 49a, 49b, 49c, 49d notch, 6
0 battery, 61 battery element, 62 notch, 63 exterior material, 64 negative electrode material, 65 positive electrode material, 66 electrolyte member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Nishimoto 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Kazuhiro Noda 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5H022 AA09 AA18 BB02 BB25 CC08 CC19 CC21 EE01 EE03 EE04 5H029 AJ02 AJ03 AJ05 AJ14 AK01 AK02 AK03 AK05 AL06 AL07 AL08 AL12 AL16 AM00 AM02 AM03 AM04 AM05 C07 BJJBJJ DJ07 DJ12 DJ14 EJ01 EJ12 HJ04 HJ12 5H040 AA02 AA03 AS11 AS13 AS15 AT01 AT04 AY01 GG27 GG28 NN01 NN03 5H050 AA02 AA07 AA08 AA19 BA16 BA17 BA18 CA02 CA07 CA08 CA09 CA11 CB07 CB08 FA08 GA08 FA20 GA08 GA22 HA04 HA12

Claims (7)

[Claims] 1. A battery element comprising: a negative electrode material obtained by applying an electrode active material to a long current collector; and a positive electrode material laminated via a sheet-shaped electrolyte member made of a polymer organic material; A negative electrode material and an exterior material for leading one end of a terminal portion provided on the current collector of the positive electrode material to the outside to seal the battery element, wherein the battery element includes the negative electrode material and the positive electrode material, At least one end of each current collector is provided with a current collector exposed portion comprising an uncoated portion of the electrode active material, and a cutout is formed over the entire length of the coated region of the electrode active material in a longitudinal direction. A plurality of strip-shaped element portions formed and divided in series at the current collector exposure portion are divided, and the negative electrode material and the positive electrode material are arranged on both surfaces of the electrolyte member by locating the respective cutout portions. Join and bend through the notch And a battery that is sealed in the exterior material. 2. The battery according to claim 1, wherein the notch has a width larger than a thickness of the battery element. 3. The battery according to claim 1, wherein the battery element has flexibility. 4. The battery according to claim 1, wherein the battery is housed inside a long component attached to the electronic device, and supplies power to the electronic device. 5. The battery according to claim 1, wherein the battery element is bent along the notch, wound up, and sealed in the exterior material. 6. The battery element is sealed in the outer package so as to lead one end of the current collector exposure part to the outside, so that the lead end of the current collector exposure part is connected to the terminal part. The battery according to claim 1, wherein the battery is configured as: 7. The battery according to claim 1, wherein a terminal strip member led out of an exterior material is joined to the current collector exposed portion.