JPH11265732A - Nonaqueous electrolyte battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase volume energy density by reducing the thickness of a battery and by thinning an electricity generating element. SOLUTION: This nonaqueous electrolyte battery has a flat and spiral electricity generating element 1 around which a positive electrode 5 with a positive electrode active material layer 9 a formed on both surfaces of a strip positive electrode core body 10 and a negative electrode 6 with a negative electrode active material layer 21 a formed on both surfaces of a strip negative electrode core body 17 are wound through a separator, and the electricity generating element 1 is stored in a laminated outer enclosure 3 which is deformed by a slight rise of an inner pressure of a battery. A positive electrode tab 7 and a negative electrode tab 8 are extended from the positive electrode 5 and the negative electrode 6, respectively, almost perpendicularly to a longitudinal direction of both core bodies 10, 17 and the both tabs 7, 8 are placed with a designated space kept between them. In this case, a part 14 a where active material is not painted and which is longer than a distance between both tabs 7, 8 is formed on at least either one of surfaces of at least either one of both electrodes 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte battery having an outer casing which is deformed by a slight increase in battery internal pressure, and in which a power generating element is housed.

[0002]

2. Description of the Related Art Heretofore, as an exterior body of a non-aqueous electrolyte battery, one entirely made of metal such as stainless steel has been used. However, in a battery using such an exterior body, the metal exterior body must be thickened, and the battery weight increases accordingly. As a result, there are problems that it is difficult to reduce the thickness of the battery and that the weight energy density of the battery is reduced.

[0003] Therefore, the present inventors previously constructed a laminate outer package by forming a laminate material having a resin layer formed on both sides of a metal layer made of aluminum or the like via an adhesive layer in a bag shape. A thin battery that accommodates power generation elements in the storage space of the laminate exterior body was proposed. A battery having such a structure has the advantages that the size of the battery can be dramatically reduced and the weight energy density of the battery increases.

[0004] However, the battery using the above-mentioned laminated exterior body has a larger size than the battery using the metal exterior body.
The exterior body is flexible. For this reason, since the exterior body is deformed in accordance with the thickness of the power generating element, the thickness of the battery increases as the power generating element becomes thicker. As a result, there is a problem that the volume energy density is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and reduces the thickness of a battery by reducing the thickness of a power generation element, thereby dramatically increasing the volume energy density. It is intended to provide a nonaqueous electrolyte battery capable of performing the above.

[0006]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present invention is directed to a positive electrode in which a positive electrode active material layer is formed on both sides of a belt-like positive electrode core, and a belt-like positive electrode. A negative electrode having a negative electrode active material layer formed on both surfaces of the negative electrode core body,
It has a flat spiral power generating element wound through a separator, and this power generating element is housed in an outer casing that is deformed by a slight increase in battery internal pressure, and a positive electrode tab is separated from the negative electrode by the positive electrode tab. In a non-aqueous electrolyte battery having a structure in which the negative electrode tabs are respectively extended substantially perpendicular to the longitudinal direction of the two cores, and the two tabs are arranged at a predetermined interval, at least one of the two electrodes At least one surface is provided with an active material non-applied portion that is longer than the distance between the two tabs. In a battery having a flat spiral power generating element in which a positive electrode provided with a positive electrode tab and a negative electrode provided with a negative electrode tab are wound with a separator interposed therebetween, in order to prevent a short circuit caused by contact between the two tabs. In addition, it is necessary to arrange both tabs to some extent. Therefore, in order for the two to substantially match at the winding end of the positive and negative electrodes, one pole must be longer than the other. However, with such a structure, the elongated electrode portion is not involved in charge / discharge, but because the active material layer is formed, the power generation element becomes thicker by the thickness of the active material layer, As a result, the thickness of the battery also increases. In particular, since both tabs have a certain thickness, the thickness at the portion where both tabs are formed increases. From this, the volume energy density and the like decrease.
However, as in the above configuration, if at least one surface of at least one of the two poles is formed with an active material non-applied portion that is longer than the distance between the tabs, the active material non-applied portion is not used. It becomes thinner by the thickness of the material layer. In particular, the active material non-applied portion is formed more than the distance between both tabs, and the active material non-applied portion always exists at a position corresponding to both tabs. Battery) thickness. From this,
The volume energy density of the battery increases, and the weight energy density increases due to the presence of the uncoated portion of the active material. In addition, according to the conventional structure, when the battery is stored in a charged state (particularly, stored at a high temperature), the elongated electrode portion that is not involved in charging and discharging is charged to some extent. However,
Since discharge cannot be performed in this portion, the discharge capacity is reduced by that much, and the thickness of the battery after repeated charge / discharge cycles is increased. On the other hand, according to the above structure, since the active material layer is not formed in the elongated electrode portion that does not participate in charge and discharge, the charged portion can be prevented from being charged by storage. Therefore, the discharge capacity does not decrease, and the increase in the battery thickness after repeating the charge / discharge cycle can be suppressed although the reason is not clear. According to a second aspect of the present invention, in the first aspect of the present invention, the two tabs are respectively provided at winding start ends of the two poles. With such a configuration, the mounting of both tabs on both the positive and negative electrodes is facilitated, so that the manufacturing cost of the battery is reduced. According to a third aspect of the present invention, in the first or second aspect of the invention, the length of the active material layer uncoated portion is configured to be at least twice the distance between the two tabs. Features. With such a configuration,
Since the thickness of the battery can be further reduced, the above-described effect is further exhibited. According to a fourth aspect of the present invention, in the first, second or third aspect, the power generating element is thin. A thin battery is very effective because it is particularly necessary to reduce the thickness. According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, the both active material layers of the two electrodes are made of a material capable of reversibly storing and releasing lithium ions. I do. If the present invention is applied to a secondary battery as described above,
Although the reason is not clear, it is possible to suppress an increase in the battery thickness after repeating the charge / discharge cycle. The invention according to claim 6 is the invention according to claim 1, 2, 3, 4, or 5,
It is characterized in that graphite is used as the negative electrode active material.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of the nonaqueous electrolyte battery according to the first embodiment, and FIG.
3 is a cross-sectional view taken along line AA of FIG. 3, FIG. 3 is a cross-sectional view of a laminate exterior body used for the nonaqueous electrolyte battery according to the first embodiment, and FIG. 4 is a front view of a positive electrode used for the nonaqueous electrolyte battery according to the first embodiment. Figure,
5 is a rear view of a positive electrode used in the nonaqueous electrolyte battery according to the first embodiment, FIG. 6 is a front view of a negative electrode used in the nonaqueous electrolyte battery according to the first embodiment, and FIG. FIG. 8 is a perspective view of a power generating element used for a non-aqueous electrolyte battery according to the first embodiment.

As shown in FIG. 2, the thin battery of the present invention has a power generating element 1, which is disposed in a storage space 2. As shown in FIG. 1, the storage space 2 is formed by sealing the upper and lower ends and the central portion of the laminate exterior body 3 with sealing portions 4a, 4b, and 4c, respectively. Further, the storage space 2 contains ethylene carbonate (E
C) and diethyl carbonate (DEC) in a mixed solvent of 4: 6 in volume ratio, and LiPF _{6 in an amount} of 1
An electrolyte dissolved at a rate of M (mol / liter) is injected. In addition, as shown in FIG.
Is manufactured by winding a positive electrode 5 made of LiCoO ₂ , a negative electrode 6 made of graphite, and a separator (not shown in FIG. 8) separating these two electrodes in a flat spiral shape.

As shown in FIG. 3, a specific structure of the laminate outer casing 3 is such that adhesive layers 12 and 12 (thickness) made of modified polypropylene are respectively provided on both sides of an aluminum layer 11 (thickness: 30 μm). : 5 μm) through a resin layer 13 made of polypropylene (thickness: 30 μm)
m) is a structure to be bonded.

Further, the positive electrode 5 is connected to a positive electrode current collecting tab 7 made of aluminum, and the negative electrode 6 is connected to a negative electrode current collecting end tab 8 made of copper. To be taken out. As shown in FIGS. 1 and 2, the size of this battery is 35 mm in width L _{1 and} 80 mm in length L _2.
mm and a thickness L3 of ₃ mm.

Here, the battery having the above structure was manufactured as follows. First, LiCoO ₂ as a positive electrode active material
After a positive electrode mixture was prepared by mixing acetylene black as a conductive agent, graphite, and polyvinylidene fluoride (PVdF) as a binder at a weight ratio of 90: 2: 3: 5, FIG. As shown in FIG. 5 and FIG. 5 (in FIGS. 4 and 5, the positive electrode tab 7 attached to the positive electrode 5 in a later step is also shown by a solid line for easy understanding), and this positive electrode mixture is made of aluminum. The positive electrode active material layer 9a is coated on both sides of the strip-shaped positive electrode core body 10 and further rolled and dried.
9b was formed. Thereby, the positive electrode 5 is manufactured. At this time, the positive electrode core 10 near the positive electrode tab 7
On both surfaces of the positive electrode active material layers 9a and 9b, the positive electrode active material uncoated portions 14a and 14b are not formed, and one of the positive electrode cores 10 near the end opposite to the positive electrode tab 7 is formed. On the surface, a positive electrode active material non-coated portion 14c in which the positive electrode active material layer 9b was not formed was formed. The length L ₄ of the positive electrode 5 was 253 mm, and the width L _{5 of the} positive electrode ₅ was 55.5 m.
m, length L ₆ · L of positive electrode active material-uncoated portions 14a and 14b
₇ is 36 mm, the length L ₈ of the positive electrode active material uncoated portion 14 c is 70 mm, the length L ₉ of the positive electrode active material layer 9 a is 217 mm,
The length L ₁₀ of the positive electrode active material layer 9b is 147 mm, the positive electrode tab 7
Width L ₁₁ of was 4mm.

At the same time, natural graphite as a negative electrode active material and polyvinylidene fluoride as a binder were mixed at a weight ratio of 90:10 to prepare a negative electrode mixture. (In FIG. 6, for easy understanding, the negative electrode tab 8 attached to the negative electrode 6 in a later step is also shown by a solid line.) As shown in FIG. 17, apply to the entire surface on both sides, and further dry,
The negative electrode active material layer 21a was formed by rolling. This allows
The negative electrode 6 is manufactured. The length L ₁₂ of the negative electrode 6 is 22
5 mm, the width L ₁₃ of the negative electrode 6 is 57.5 mm, the width L ₁₄ of the negative electrode tab 8 was 4 mm. Also, since both surfaces of the negative electrode 6 have the same configuration, drawings and description of the other surface are omitted. Next, after attaching a positive electrode current collecting tab 7 and a negative electrode current collecting tab 8 to these positive and negative electrodes 5 and 6, respectively, as shown in FIG. 7 (separator is omitted in FIG. 7),
As tab distance L ₁₅ between both tabs 7, 8 is 18 mm, arranging the positive and negative electrodes 5, 6 via the separator. Thereafter, the positive and negative electrodes 5 and 6 and the separator are wound in a flat spiral shape using the winding thin plate 15, and the power generating element 1 shown in FIG. 8 (the separator is omitted in FIG. 8). Was prepared.

Next, a sheet-like laminated material having a five-layered structure of a resin layer (polypropylene) / adhesive layer / aluminum alloy layer / adhesive layer / resin layer (polypropylene) is prepared. Neighboring parts were overlapped, and the overlapped part was welded to form a sealing part 4c. Next, the power generating element 1 was inserted into the storage space 2 for the cylindrical laminate. At this time, the power generating element 1 was arranged so that both the current collecting tabs 7 and 8 protruded from one opening of the cylindrical laminated material. Next, in this state, the laminated material in the opening from which the current collecting tabs 7 and 8 protruded was welded and sealed to form a sealed portion 4a. At this time, welding was performed using a high frequency induction welding apparatus.

Next, in this state, drying by heating under vacuum (temperature
(Degree: 105 ° C) for 2 hours.
The water of element 1 was removed. After this, ethylene carbonate
And diethyl carbonate at a volume ratio of 4: 6
LiPF is added to the mixed solvent ₆Is 1M (mol / litre)
After injecting the electrolyte dissolved in the ratio of
For 1 hour. After that, the LA corresponding to power generation element 1
While pressing the minate material with a metal plate, the sealing portion 4a
Is the other end of the laminate using ultrasonic welding equipment
The non-aqueous electrolyte by forming
A battery was manufactured. In addition, the process after the above-mentioned electrolyte injection process
Was performed in a dry box in an argon atmosphere.

Here, the resin layer of the laminate exterior body is not limited to the above-mentioned polypropylene, but may be, for example, a polyolefin polymer such as polyethylene, a polyester polymer such as polyethylene terephthalate, polyvinylidene fluoride, polyvinylidene chloride. Such as polyvinylidene polymer, nylon 6, nylon 66, nylon 7
And the like. Further, the structure of the laminate exterior body is not limited to the above five-layer structure. Furthermore, the exterior body is not limited to a laminate exterior body, and it goes without saying that the present invention can be applied to any exterior body that is deformed by a slight increase in battery internal pressure.

Further, as the positive electrode material, the above LiCoO ₂
In addition, for example, LiNiO ₂ , LiMn ₂ O ₄ or a composite thereof, or a conductive polymer such as polyaniline or polypyrrole is suitably used.In addition to the above graphite, carbon black, coke,
Glassy carbon, carbon fiber, or a fired body thereof is preferably used. Further, the present invention is not limited to the above-mentioned lithium ion battery, but can be applied to other batteries such as a polymer battery in which a solid electrolyte exists between the positive and negative electrodes.

In addition, the electrolyte used is not limited to the above-mentioned LiPF ₆ , but may be LiN (CF ₃ S
O ₂ ) ₂ , LiClO ₄ , LiBF _{4 and the} like can also be used. Second Embodiment A second embodiment of the present invention will be described below with reference to FIGS. FIG. 9 is a front view of a positive electrode used in the nonaqueous electrolyte battery according to the second embodiment. FIG. 10 is a rear view of a positive electrode used in the nonaqueous electrolyte battery according to the second embodiment.
FIG. 4 is a front view of a negative electrode used for a nonaqueous electrolyte battery according to a second embodiment. The above for the first member having the same function as the embodiment and the description is omitted, also omitted also the description for those it is the first embodiment and the same length and width (L _4, etc.) I do. This is the same for the following embodiments. As shown in FIGS. 9 and 10, the width L ₆ of the positive electrode active material non-coated portions 14 a and 14 b of the positive electrode 5 is reduced to 6 mm (in this case, the positive electrode active material non-coated portions 14 a and 1
4b is substantially covered by the positive electrode lead 7 and thus does not have the original role of the uncoated portion of the positive electrode active material), and also has the negative electrode 6 on both sides at the winding start end (near the negative electrode tab 8) as shown in FIG. The configuration is the same as that of the nonaqueous electrolyte battery of the first embodiment except that the active material non-applied portion 20a is formed.
Since the negative electrode 6 has the same configuration on both surfaces, the drawings and description of the other surface are omitted. Here, as the width L ₆ of the positive electrode active material uncoated portions 14a and 14b of the positive electrode 5 is reduced, the length L ₄ of the positive electrode 5 is set to 223 mm, the length L ₁₂ of the negative electrode 6 is set to 255 mm, Negative electrode active material layer 21
The length L _{16 of a} was set to 223 mm, and the length L ₁₇ of the negative electrode active material non-applied portion 20 a was set to 32 mm. [Third Embodiment] FIGS. 12 to 15 show a third embodiment of the present invention.
This will be described below based on FIG. 12 is a front view of a positive electrode used in the nonaqueous electrolyte battery according to the third embodiment, and FIG.
Rear view of the positive electrode used in the nonaqueous electrolyte battery according to the embodiment, FIG. 14 is a front view of the negative electrode used in the nonaqueous electrolyte battery according to the third embodiment, and FIG. 15 is used for the nonaqueous electrolyte battery according to the third embodiment. It is a rear view of a negative electrode. As shown in FIG.
The non-aqueous electrolyte battery according to the first embodiment has the same configuration as that of the first embodiment except that the negative electrode active material non-applied portion 20b is formed on one surface at the winding start end (near the negative electrode tab 8). Here, the length L ₁₈ of the negative electrode active material layer 21b and 160 mm, the length L ₁₉ of the negative electrode active material uncoated portion 20b was set to 65mm and. [Fourth Embodiment] A fourth embodiment of the present invention will be described with reference to FIGS.
This will be described below based on FIG. 16 is a front view of a positive electrode used in the nonaqueous electrolyte battery according to the fourth embodiment, and FIG.
FIG. 18 is a rear view of a positive electrode used in the nonaqueous electrolyte battery according to the fourth embodiment, and FIG. 18 is a front view of a negative electrode used in the nonaqueous electrolyte battery according to the fourth embodiment. As shown in FIG. 16 and FIG.
The width L ₆ of the positive electrode active material non-coated portions 14a and 14b is 6 mm.
(In this case, the positive electrode active material uncoated portion 14a
14b is substantially covered by the positive electrode lead 7, so that it does not have the original role of the non-coated portion of the positive electrode active material). The negative electrode 6
Have the same configuration on both sides, and the drawings and description of the other side are omitted. Here, as the width L ₆ of the positive electrode active material uncoated portions 14a and 14b of the positive electrode 5 is reduced,
The length L ₄ of the positive electrode 5 with a 223 mm, the length L ₁₂ of the negative electrode 6 was set to 255 mm.

[0018]

EXAMPLES Example 1 In Example 1, the battery shown in the first embodiment was used. The battery fabricated in this manner is hereinafter referred to as Battery A1 of the invention.

Example 2 In Example 2, the battery shown in the second embodiment was used. The battery fabricated in this manner is hereinafter referred to as Battery A2 of the invention. Example 3 In Example 3, the battery described in the third embodiment was used. The battery fabricated in this manner is hereinafter referred to as Battery A3 of the invention. Example 4 In Example 4, the battery described in the fourth embodiment was used. The battery fabricated in this manner is hereinafter referred to as Battery A4 of the invention.

Comparative Example A comparative example of the present invention will be described below with reference to FIGS. FIG. 19 is a front view of a positive electrode used for a nonaqueous electrolyte battery according to a comparative example, and FIG. 20 is a front view of a negative electrode used for a nonaqueous electrolyte battery according to a comparative example. The above for the first embodiment member having the same function as the description is omitted, also omitted also the description for those is the first embodiment and the same length and width (L _4, etc.) I do. As shown in FIG. 19, the width L ₆ of the positive electrode active material non-applied portion 14a of the positive electrode 5 is shortened to 6 mm (in this case, the positive electrode active material non-applied portion 14a is almost covered by the positive electrode lead 7; The non-aqueous electrolyte battery according to the first embodiment has the same configuration as that of the non-aqueous electrolyte battery of the first embodiment except that the positive electrode active material non-coated portion 14c is not formed together with the active material non-coated portion. Since the positive electrode 5 and the negative electrode 6 have the same configuration on both surfaces, drawings and description of the other surface are omitted. Here, with the fact that a shorter width L ₆ of the positive electrode active material uncoated portion 14a of the positive electrode 5, the length L ₄ of the positive electrode 5 with a 223 mm, the length L ₁₂ of the negative electrode 6 was set to 325 mm. [Experiment 1] In the batteries A1 to A4 of the present invention and the comparative battery X, the volume energy density and the weight energy density were examined, and the capacity recovery rate after the battery was charged under the following conditions and further stored at 60 ° C. for 20 days. The results are shown in Table 1. The capacity recovery rate is calculated by the following equation (1). The charge / discharge conditions for calculating the capacity retention rate and the capacity recovery rate are as follows.

Charging conditions: Constant current and constant voltage charging. More specifically, after the battery voltage reaches 4.1 V at a current of 500 mA, the charging is terminated when the current value drops to 25 mA. Discharge conditions: constant current discharge, specifically, 500 mA
When the battery voltage reaches 2.75 V with the current of 2, the discharge is terminated.

[0022]

(Equation 1)

[0023]

[Table 1]

As apparent from Table 1, the comparative battery X has a volume energy density of 188 Wh / L, a weight energy density of 110 Wh / kg, and a capacity recovery rate of 83%, whereas the batteries A1 to A4 of the present invention have a volume energy density of 110 Wh / kg and a capacity recovery rate of 83%. Has a volume energy density of 207 Wh / L or more and a weight energy density of 117
Wh / kg or more, the capacity recovery rate was 84% or more, and it was recognized that all were superior to Comparative Battery X. In particular, in the battery A3 of the present invention in which the active material-uncoated portions are provided on both the positive and negative electrodes,
The volume energy density is 237 Wh / L, the weight energy density is 133 Wh / kg, and the capacity recovery rate is 89%.

Although not shown in Table 1, when the cycle characteristics of the batteries A1 to A4 of the present invention and the comparative battery X were examined, the batteries A1 to A4 of the present invention showed a higher charge / discharge cycle than the comparative battery X. It was confirmed by an experiment that the swelling of the battery after completion was significantly reduced.

[0026]

As described above, according to the present invention,
Since the thickness of the power generating element (battery) is reduced, the volume energy density of the battery is increased, and the weight energy density is increased due to the presence of the uncoated portion of the active material. Is not formed, so that an excellent effect of suppressing a decrease in discharge capacity and suppressing an increase in battery thickness after repeated charge / discharge cycles can be achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a nonaqueous electrolyte battery according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a cross-sectional view of a laminate exterior body used for the nonaqueous electrolyte battery according to the first embodiment.

FIG. 4 is a front view of a positive electrode used in the nonaqueous electrolyte battery according to the first embodiment.

FIG. 5 is a rear view of a positive electrode used in the nonaqueous electrolyte battery according to the first embodiment.

FIG. 6 is a front view of a negative electrode used in the nonaqueous electrolyte battery according to the first embodiment.

FIG. 7 is an explanatory diagram of a process when manufacturing the nonaqueous electrolyte battery according to the first embodiment.

FIG. 8 is a perspective view of a power generating element used in the nonaqueous electrolyte battery according to the first embodiment.

FIG. 9 is a front view of a positive electrode used for a nonaqueous electrolyte battery according to a second embodiment.

FIG. 10 is a rear view of a positive electrode used in the nonaqueous electrolyte battery according to the second embodiment.

FIG. 11 is a front view of a negative electrode used in a nonaqueous electrolyte battery according to a second embodiment.

FIG. 12 is a front view of a positive electrode used for a nonaqueous electrolyte battery according to a third embodiment.

FIG. 13 is a rear view of the positive electrode used in the nonaqueous electrolyte battery according to the third embodiment.

FIG. 14 is a front view of a negative electrode used for a nonaqueous electrolyte battery according to a third embodiment.

FIG. 15 is a rear view of the negative electrode used in the nonaqueous electrolyte battery according to the third embodiment.

FIG. 16 is a front view of a positive electrode used for a nonaqueous electrolyte battery according to a fourth embodiment.

FIG. 17 is a rear view of the positive electrode used in the nonaqueous electrolyte battery according to the fourth embodiment.

FIG. 18 is a front view of a negative electrode used for a nonaqueous electrolyte battery according to a fourth embodiment.

FIG. 19 is a front view of a positive electrode used for a nonaqueous electrolyte battery of a comparative example.

FIG. 20 is a front view of a negative electrode used for a nonaqueous electrolyte battery of a comparative example.

[Explanation of symbols]

 1: Power generation element 2: Storage space 3: Laminated exterior body 5: Positive electrode 6: Negative electrode 7: Positive electrode tab 8: Negative electrode tab 9a: Positive electrode active material layer 9b: Positive electrode active material layer 10: Positive electrode core 14a: No active material applied Part 14b: Active material non-coated part 14c: Active material non-coated part 20a: Active material non-coated part 17: Negative electrode core 21a: Negative electrode active material layer 21b: Negative electrode active material layer

Claims (6)

[Claims] 1. A positive electrode having a positive electrode active material layer formed on both sides of a belt-shaped positive electrode core and a negative electrode having a negative electrode active material layer formed on both surfaces of a band-shaped negative electrode core are wound via a separator. A flat spiral-shaped power generating element is provided, and the power generating element is housed in an outer casing that is deformed by a slight increase in battery internal pressure, and a positive electrode tab is formed from the positive electrode, and a negative electrode tab is formed from the negative electrode. In a non-aqueous electrolyte battery having a structure extending substantially perpendicular to the longitudinal direction of the two cores and having the two tabs arranged at a predetermined interval, at least one surface of at least one of the two electrodes has A non-aqueous electrolyte battery, wherein an active material non-applied portion that is longer than the distance between the two tabs is formed. 2. The non-aqueous electrolyte battery according to claim 1, wherein said tabs are respectively provided at winding start ends of said electrodes. 3. The non-aqueous electrolyte battery according to claim 1, wherein the length of the uncoated portion of the active material layer is at least twice the distance between the tabs. 4. The power generation element according to claim 1, wherein the power generation element is thin.
4. The non-aqueous electrolyte battery according to 2 or 3. 5. The non-aqueous electrolyte battery according to claim 1, wherein said both active material layers are made of a material capable of reversibly occluding and releasing lithium ions. 6. The non-aqueous electrolyte battery according to claim 1, wherein graphite is used as the negative electrode active material.