JP2004303590A - Laminated battery, and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated battery with improved liquid containing property, gas venting property, and battery capacity. <P>SOLUTION: The laminated battery has a laminate envelope and a flatly wound electrode body formed by arranging a separator between a positive electrode 1 on which a positive electrode mixture 7 containing positive electrode activator storing and releasing lithium ion is painted, having a positive electrode tab 3 on a metallic core foil 5, and a negative electrode 1 on which a negative electrode mixture containing negative electrode activator storing and releasing lithium ion is painted, having a negative electrode tab 3 on the metallic core foil, and winding and crushing the positive electrode and the negative electrode in a state of being insulated from each other by the separator. A part 2 where the positive electrode mixture 7 is not painted is arranged in the vicinity of the back and front side of the central part in longitudinal direction of the positive electrode. The positive electrode tab 3 is welded on one surface on which the positive electrode mixture is not painted, and exposed surface is coverer by an insulation tape 4, and the other surface of not painted part is covered by a protection tape 6. The inside of the flatly wound electrode is formed so as not to generate any bumpy part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

又は、ポリプロピレングリコールジメタクリレート
【化２】

（ただし、ｎ＝３）
を、重量比で１２：１の割合で混合した溶液に重合開始剤としてｔ−へキシルパーオキシピパレートを５０００ｐｐｍ添加して形成し、巻回電極体を収納したラミネート包材の内部に注液した。
【００３０】
なお、電解質としてはＬｉＰＦ_６のほかにＬｉＢＦ_４、ＬｉＮ（ＳＯ_２ＣＦ_３）_２、ＬｉＮ（ＳＯ_２Ｃ_２Ｆ_５）_２及びこれらを混合したものを用いることができる。次いで、電解液を注液したラミネート外装体の他方のサイド側を仮溶着した後、６０℃オーブン中に３時間静置して熱硬化させ、予備充電及びエージングを行った。
【００３１】
結いで、仮溶着されていたラミネートのサイド部の片側（残り側）を、金型で溶着して本封止部を形成した。予備室の不要部分を切断除去し、サイド封止部を折り曲げてリチウムラミネート電池を得た。
【００３２】
本発明のラミネート電池に係る実施例と、正極タブを金属製芯体箔の巻き初めに設けた従来のラミネート電池に係る比較例とについて、それぞれ電池サイズ２．６×８０×１２０ｍｍ、公称容量２２００ｍＡｈ（公称電圧３．６Ｖ）の電池を作製し、以下に述べる条件下で充放電試験を行った。
（１）充電：初期には２２００ｍＡの定電流で充電し、電池電圧が４．２Ｖまで上昇したときに定電流充電から定電圧充電に切換えた。定電圧充電では電池電圧を４．２Ｖに保つように、充電の進行に伴って電流値を低下させていき、電流値が４４０ｍＡになったときに充電終了とした。
（２）放電：２２００ｍＡの定電流で放電させ、電池電圧が３Ｖまで低下したときに放電終了とした。
その測定結果を結果を表１にまとめて示す。
【００３３】
【表１】

【００３４】
上記の表により、本発明の実施例の方が比較例に比べ大きい容量が得られたことが分かる。
【００３５】
【発明の効果】
以上述べたように、本発明のラミネート電池によれば、正極タブが正極の長さ方向中央部付近に配置されていることにより、偏平巻回電極体の凹凸が抑制され、含液性及びガス抜け性が向上し、結果として従来のラミネート電池より電池容量が増大するという効果が得られる。
【図面の簡単な説明】
【図１】本発明の巻回前の正極を示し、図１（Ａ）は平面図、図１（Ｂ）は底面図である。
【図２】本発明の巻回前の負極の平面図である。
【図３】本発明の巻回加圧成形後の正極の要部拡大断面図
【図４】従来の巻回される前の電極の平面図である。
【図５】従来のラミネート電池の製造方法を示す図である。
【図６】従来の偏平巻回電極体の押し潰し成形後の正極タブ部の断面図である。
【図７】従来の長さ方向中央部にタブを有する巻回される前の電極の平面図である。
【符号の説明】
１ 正極
２ 不塗布部分
３ 正極タブ
４ 絶縁テープ
５ 正極芯体箔
６ 保護テープ
７ 正極合剤
２１ 負極
２１ａ 負極巻き始め端部
２２ 負極タブ
２３ 絶縁テープ
２４ 負極芯体箔[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a laminated battery, and particularly to a laminated battery using a flat wound electrode, improves the liquid content and outgassing property of the electrolyte, and eliminates the defects such as poor insulation between the positive and negative electrodes to improve the reliability. Related to an enhanced laminated battery.
[0002]
[Prior art]
With the rapid spread of portable electronic devices, the requirements for batteries used in them have become stricter year by year, and in particular, smaller and thinner, higher capacity, superior cycle characteristics, and stable performance are required. ing. In the field of secondary batteries, lithium non-aqueous electrolyte secondary batteries, which have a higher energy density than other batteries, are attracting attention, and the proportion of lithium non-aqueous electrolyte secondary batteries has shown a significant growth in the secondary battery market. ing.
[0003]
The lithium non-aqueous electrolyte secondary battery includes a negative electrode in which a negative electrode mixture containing a negative electrode active material that inserts and desorbs lithium ions is applied to both surfaces of a negative electrode core (current collector) formed of a long and thin sheet-like copper foil, A separator made of a microporous polypropylene film or the like is placed between a positive electrode coated with a positive electrode mixture containing a positive electrode active material that absorbs and releases lithium ions on both surfaces of a positive electrode core made of an elongated sheet-like aluminum foil, etc. Then, after winding the negative electrode and the positive electrode in a cylindrical or elliptical shape in a state in which they are insulated from each other by a separator, in the case of a prismatic battery, further crush the wound electrode body to form a flat shape, and form each of the negative electrode and the positive electrode. It is manufactured by connecting a negative electrode tab and a positive electrode tab to predetermined portions, respectively, and covering the outside with an exterior.
[0004]
In a conventional non-aqueous electrolyte secondary battery, a non-aqueous electrolyte battery is manufactured by inserting a wound electrode body into a cylindrical outer can and then injecting a non-aqueous electrolyte. As shown in FIG. 4, the electrode body is provided with an uncoated portion 42 of a mixture in which a metal core foil is exposed at the beginning or end of the winding of the positive electrode or the negative electrode 41. It is customary to weld a tab 43 represented by the following formula, cover this tab portion with an insulating tape 44, and connect the tab 43 to an electrode terminal of a battery. (See Patent Document 1).
[0005]
By the way, in the above-mentioned non-aqueous electrolyte secondary battery, a metal outer can is mainly used in order to provide an outer casing and to provide strength. However, in recent years, the purpose is to reduce weight, increase battery capacity per unit volume, and the like. As a result, laminated batteries using a laminated film have been manufactured. Therefore, in order to understand the present invention, a conventional manufacturing process of the laminated battery 50 will be described below with reference to FIG.
[0006]
First, the flat wound electrode body 11 is manufactured in the same manner as in the above-described conventional example. At this time, the flat wound electrode body 11 has a negative electrode tab 12 welded to the negative electrode metal core foil exposed portion and a positive electrode tab 13 also welded to the positive electrode metal core foil exposed portion. deep. Subsequently, as shown in FIG. 5A, a well-known laminated film 54 having a predetermined size, for example, an aluminum laminated film is folded in two, and the flat wound electrode body 51 is disposed therein, and if necessary, Accordingly, thin sealing materials 55 and 55 ′ are arranged on both sides of the lead-out portions of the negative electrode tab 52 and the positive electrode tab 53, and the top part (tab side) of the laminated film 54 is placed in a bar-shaped mold (not shown). To form a top sealing portion 56. At this time, an unwelded portion 56 ′ is provided on the outer edge of the top sealing portion 56 so that the melted sealant layer does not protrude from the laminate film 54 and adhere to the mold.
[0007]
Next, as shown in FIG. 5B, a first side sealing portion 57 is formed by welding one side of the side portion of the laminated film 54 using a bar-shaped mold. Also in this case, the outer edge of the first side sealing portion 57 is provided with a non-welded portion 57 ′ so that the melted sealant layer does not protrude from the laminate film and adhere to the mold. Next, the liquid electrolyte is injected from the other side portion side 58. Then, the liquid electrolyte sufficiently penetrates into the flat wound electrode body 51. Thereafter, as shown in FIG. 5C, the other side of the laminate film 54 is temporarily welded with a bar-shaped mold to form a temporarily sealed portion 60. Next, after pre-charging and aging, as shown in FIG. 5D, the other side of the laminate film 54 is welded with a bar mold to form a second side sealing portion 61. Then, unnecessary portions of the laminate film are cut to obtain a conventional laminated battery 50 as shown in FIG.
[0008]
Thus, also in the conventional laminated battery, the tab of each electrode is arranged on the core foil at the beginning or end of the winding of each electrode, and the surface of this tab does not cause a short circuit between the pair of electrodes. To do so, it is covered with an insulating tape like the electrodes shown in FIG. In addition, particularly when the negative electrode active material is present on the opposite surface of the positive electrode core foil, the conductive powder detached from the negative electrode active material tends to cause a short circuit. It may be covered with an insulating tape (see Patent Document 2).
[0009]
Therefore, a positive electrode in which a positive electrode mixture containing a positive electrode active material that absorbs and releases lithium ions is applied on a metal core foil, and a negative electrode that contains a negative electrode active material that inserts and releases lithium ions on a metal core foil The negative electrode coated with the mixture is wound in a state insulated from each other via two separators made of a microporous polypropylene film, and then crushed to produce a flat wound electrode body. Due to the presence of the insulating tape provided on the surface of the tab, irregularities are formed toward the inner surface of the flat wound electrode body. However, there is a problem that air bubbles during the injection of the gas and the generation of the charged gas tend to collect in the portion where the stress is applied.
[0010]
This phenomenon will be described in more detail with reference to the drawings. FIG. 6 is a cross-sectional view of the flat wound electrode body 70 as viewed from the tab portion direction. A positive electrode tab 72 is welded to one surface of the metal positive electrode core foil 71, and an insulating tape 73, a negative electrode 74, and a separator 75 are sequentially laminated on the surface to form a flat wound electrode body 70. Although the surface of the flat wound electrode body 70 is flat to be crushed when manufacturing the flat wound electrode body, since the positive electrode tab 72 and the insulating tape 73 are present, the inside thereof is inside. Stress is applied in the direction, and the shape is deformed as shown in FIG. In this case, stress is applied to the separator and the negative electrode near the corner 76 of the positive electrode tab 72, and when a non-aqueous electrolyte is injected or gas is generated by charging, the gas easily accumulates in the portion where the stress is applied. That is.
[0011]
On the other hand, as a positive electrode of a cylindrical non-aqueous electrolyte secondary battery, a positive electrode mixture 84 is applied to the surface of a long metal foil 81 as shown in FIG. A positive electrode tab (lead plate) 83 is connected to the peeled portion, and the insulating tape 85 is spread over the positive electrode tab 83 and the surface of the raw material release portion 82 and the surrounding positive electrode mixture 84. One that has been pasted and covered is known (see Patent Document 3).
In this positive electrode, since the positive electrode tab is partially provided in the width direction of the electrode plate, the thickness of the upper and lower portions differs in the width direction, so that when the wound electrode body is formed, the displacement of the positive electrode plate occurs. In order to prevent this, an adhesive tape is applied to a part where the mixture is peeled off.
[0012]
However, since the non-aqueous electrolyte secondary battery described in FIG. 7 is used in the form of a cylindrical wound electrode body, there is no problem with using it as a flat wound electrode body. Not suggested. That is, since the cylindrical wound electrode body is not crushed, there is essentially no problem caused by the stress caused by being crushed like the flat wound electrode body.
[0013]
[Patent Document 1]
JP-A-2000-277155 (paragraphs [0002] to [0006])
[Patent Document 2]
JP-A-2002-42881 (paragraphs [0002] to [0013])
[Patent Document 3]
JP-A-8-7877 (paragraphs [0002] to [0008])
[0014]
[Problems to be solved by the invention]
As described above, in the laminated battery using the flat wound electrode body, since the flat wound electrode body is manufactured by crushing, when the tab is present at the end of the electrode, the tab is located immediately adjacent to the electrode on which the tab is present. The outer side is a laminate exterior body and has a flat surface, so that the protrusion of the thickness of the tab is wrinkled inward. Therefore, since the positive electrode tab and the insulating tape are present, the flat wound electrode body has irregularities toward the inner surface, so that bubbles during the injection of the electrolyte solution into the laminated battery and the generation of the charging gas, There has been a problem that the uneven portion easily accumulates.
[0015]
The present inventor has conducted various studies to solve the above-described problems, and as a result, in a laminated battery using a flat wound electrode body, a positive electrode tab is provided on an exposed portion of a core foil provided in an intermediate portion of a positive electrode. Even if a positive electrode tab and an insulating tape for insulating the positive electrode tab are present, it is possible to prevent unevenness in the thickness thereof, and if the flat wound electrode body is pressed again after the injection of the electrolytic solution, the flat wound electrode The present inventors have found that since the air bubbles accumulated in the body can be effectively removed, the capacity of the battery can be increased as a result, and the present invention has been completed.
[0016]
That is, the present invention provides a laminated battery having a flat spirally wound electrode body in which the battery capacity is increased by improving the liquid content of the electrolytic solution as compared with the conventional battery, and a method of manufacturing the laminated battery. The purpose is to do.
[0017]
[Means for Solving the Problems]
The object of the present invention can be achieved by the following configurations. According to the first aspect of the present invention, at least a positive electrode on which a positive electrode tab is provided on a metal core foil and a positive electrode mixture containing a positive electrode active material that absorbs and releases lithium ions is applied; A negative electrode tab is provided on the core body foil, and a separator is arranged between the negative electrode coated with a negative electrode mixture containing a negative electrode active material that absorbs and releases lithium ions, and the positive electrode and the negative electrode are insulated from each other by the separator After being wound in a stacked state in a flat state, a flat wound electrode body crushed and formed, and in a laminated battery having a laminate exterior, a positive electrode mixture non-applied portion is provided on the front and back near the center in the longitudinal direction of the positive electrode, A laminated battery in which a positive electrode tab is welded to one surface of the positive electrode mixture non-applied portion and the exposed surface is covered with insulating tape, and the other surface of the positive electrode mixture non-applied portion is covered with insulating tape, It is subjected.
[0018]
According to this aspect, even when the positive electrode tab and the insulating tape insulating the positive electrode tab are present, unevenness can be prevented from being generated in the flat wound electrode body, so that bubbles hardly accumulate inside, and as a result, the capacity of the battery Increase. That is, when the tab is located at the center of the electrode, the tab is sandwiched between the electrodes. The active material mixture is applied to both sides of the electrode, but since the mixture is removed from the tab portion, a space is secured in the tab region by the thickness of both surfaces of the mixture. Therefore, since the tab or the insulating tape is settled therein, the protrusion is eliminated, so that the unevenness does not occur inside the flat wound electrode body.
[0019]
According to this aspect, it is preferable that the positive electrode is cut at the positive electrode mixture application portion so that the core foil surfaces at the start and end of winding are not exposed. With such a configuration, it is not necessary to expose the core foil surface at the beginning and end of winding, so that the application amount of the active material mixture can be increased by that amount, and the capacity of the battery is further increased. be able to. That is, conventionally, the active material mixture was removed at the end of the positive electrode because of the tab, but in the present invention, since the positive electrode tab is located at the center, it is necessary to remove the active material mixture at the end. Is gone.
[0020]
According to this aspect, it is preferable that the laminated battery is a three-way sealed battery. Such a configuration facilitates the manufacture of a laminated battery. Further, according to this aspect, it is preferable that the laminated battery has a polymer electrolyte. With such a configuration, the electrolyte is gelled or solidified, so that leakage is reduced. Further, in this aspect, it is preferable that the negative electrode tab is located at the beginning of winding of the negative electrode. According to this aspect, a conventionally used negative electrode can be used.
[0021]
According to a second aspect of the present invention, there is provided a method of manufacturing a laminated battery including the following steps (1) to (4).
(1) a step of winding a positive electrode and a negative electrode through a separator to form a wound electrode body; (2) a step of crushing and shaping the wound electrode body to form a flat wound electrode body;
(3) a step of laminating the wound electrode body and injecting an electrolytic solution; and (4) a step of pressing the laminated electrode body.
By adopting such a method, the air bubbles accumulated in the flat wound electrode body can be effectively removed, and as a result, the capacity of the battery can be increased.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, preferred embodiments of the present invention will be described. However, the following examples illustrate a laminated battery for embodying the technical idea of the present invention and a method for manufacturing the same, and the present invention is not limited thereto. Not something.
[0023]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A is a plan view of the positive electrode before winding, FIG. 1B is a bottom view, FIG. 2 is a plan view of the negative electrode before winding, and FIG. 3 is an enlarged main part of the positive electrode after winding. It is sectional drawing.
[0024]
In the production of the laminated battery of the present invention, a positive electrode prepared by applying a positive electrode mixture containing a positive electrode active material for absorbing and releasing lithium ions onto a metal core foil such as aluminum, and a metal core foil such as copper A negative electrode coated with a negative electrode mixture containing a negative electrode active material that absorbs and releases lithium ions is insulated by two separators and wound up. I do.
[0025]
For the positive electrode, for example, lithium cobalt oxide LiCoO ₂ is used as an active material, carbon is used as a conductive agent, and a polytetrafluoroethylene resin is used as a binder. As a substance, a mixture in which a polytetrafluoroethylene resin is kneaded into a paste is used as a binder. These mixtures are applied to both sides of each core foil substrate, dried, rolled, and cut into predetermined dimensions. Further, a microporous film such as polyethylene or polypropylene is used for the separator.
[0026]
As shown in FIG. 1 (A), the non-coated portion 2 of the positive electrode mixture 7 is provided on both surfaces of the positive electrode 1 before winding, near the center in the longitudinal direction of the positive electrode 1. 2, a positive electrode tab 3 is welded. Further, on the positive electrode tab 3, an insulating tape 4 such as an adhesive tape for both reinforcement and insulation is adhered to the positive electrode core foil 5 of the uncoated portion 2, and a positive electrode active material on the back surface is provided. The protective tape 6 is also applied to the non-existing portion, and is coated so that the positive electrode core foil surface is not exposed. These tapes are applied so as to cover only the non-applied portion 2 of the positive electrode mixture 7 and not to cover the adjacent positive electrode mixture 7 layers. The non-applied portion 2 may be provided by providing an unapplied portion at the time of applying the mixture to the substrate, or by applying the mixture over the entire surface of the substrate, pressing the mixture, and then peeling off the mixture. May be. Then, both ends of the positive electrode 1 are cut at portions where the positive electrode mixture 7 is applied, and the active material mixture is applied to the end of the positive electrode 1.
[0027]
FIG. 2 is a plan view of the negative electrode 21 before being wound. The negative electrode tab 22 is welded to the winding start end 21 a, and an upper portion of the negative electrode tab weld is covered with an insulating tape 23. The opposite surface of the negative electrode tab welding portion via the negative electrode core foil 24 is a negative electrode active material layer to which the negative electrode active material mixture is applied.
[0028]
The positive electrode 1 and the negative electrode 21 are stacked and wound via a separator (not shown), and the laminated and wound one is subjected to pressure molding to obtain a flat wound electrode body similar to that of the conventional example. Since the mixture is removed from the tab 3 of the positive electrode 1 in this state, a space is secured by the thickness of both surfaces of the mixture. Therefore, as shown in FIG. 3, when the tab or the insulating tape is fitted therein, the thickness of the tab 3 of the positive electrode 1 becomes substantially the same as that of the positive electrode 1, so that the inside of the spirally wound electrode body as in the conventional example is There is no unevenness, and there is no particular stressed portion. The wound electrode body molded in this way is inserted into the aluminum laminate sheet which is folded in two to form a bottom portion, and firstly, the top sealing portion side and one side of the side sealing portion are welded. Then, a laminate exterior body in which the other side of the side sealing portion was open was formed.
[0029]
Next, an organic electrolyte solution was injected into the laminate exterior body from the unwelded portion of the side sealing portion. The electrolytic solution is composed of a polymer electrolyte forming material, and an electrolytic solution obtained by dissolving lithium hexafluorophosphate at a ratio of 1 mol / l in a mixed solvent mixed at a predetermined ratio and polypropylene glycol diacrylate.

Or, polypropylene glycol dimethacrylate

(However, n = 3)
Was formed by adding 5000 ppm of t-hexylperoxypiparate as a polymerization initiator to a solution obtained by mixing at a ratio of 12: 1 by weight, and injected into the inside of a laminate packaging material containing a wound electrode body. did.
[0030]
Note that, in addition to LiPF ₆ , LiBF ₄ , LiN (SO ₂ CF ₃ ) ₂ , LiN (SO ₂ C ₂ F ₅ ) ₂ and a mixture thereof can be used as the electrolyte. Next, after temporarily welding the other side of the laminate exterior body into which the electrolyte was injected, the laminate exterior body was left standing in a 60 ° C. oven for 3 hours to be thermally cured, and precharged and aged.
[0031]
By tying, one side (remaining side) of the side portion of the temporarily welded laminate was welded with a mold to form a final sealed portion. Unnecessary portions of the preliminary chamber were cut and removed, and the side sealing portions were bent to obtain a lithium laminated battery.
[0032]
For the example of the laminated battery of the present invention and the comparative example of the conventional laminated battery in which the positive electrode tab was provided at the beginning of the winding of the metal core foil, the battery size was 2.6 × 80 × 120 mm and the nominal capacity was 2200 mAh, respectively. (Nominal voltage of 3.6 V) was prepared, and a charge / discharge test was performed under the following conditions.
(1) Charging: The battery was initially charged at a constant current of 2200 mA, and was switched from constant current charging to constant voltage charging when the battery voltage rose to 4.2 V. In the constant voltage charging, the current value was decreased as the charging progressed so as to keep the battery voltage at 4.2 V, and the charging was terminated when the current value reached 440 mA.
(2) Discharge: Discharge was performed at a constant current of 2200 mA, and discharge was terminated when the battery voltage dropped to 3 V.
Table 1 summarizes the measurement results.
[0033]
[Table 1]

[0034]
From the above table, it can be seen that a larger capacity was obtained in the example of the present invention than in the comparative example.
[0035]
【The invention's effect】
As described above, according to the laminated battery of the present invention, since the positive electrode tab is disposed near the center in the length direction of the positive electrode, unevenness of the flat wound electrode body is suppressed, and the liquid-containing property and gas It is possible to obtain the effect that the removability is improved, and as a result, the battery capacity is increased as compared with the conventional laminated battery.
[Brief description of the drawings]
FIG. 1 shows a positive electrode before winding according to the present invention, wherein FIG. 1 (A) is a plan view and FIG. 1 (B) is a bottom view.
FIG. 2 is a plan view of a negative electrode before winding according to the present invention.
FIG. 3 is an enlarged cross-sectional view of a main part of a positive electrode after wound pressure molding of the present invention. FIG. 4 is a plan view of a conventional electrode before being wound.
FIG. 5 is a diagram showing a conventional method for manufacturing a laminated battery.
FIG. 6 is a cross-sectional view of a positive electrode tab after a conventional flat wound electrode body is crushed and formed.
FIG. 7 is a plan view of a conventional unwound electrode having a tab at the center in the longitudinal direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Uncoated part 3 Positive electrode tab 4 Insulating tape 5 Positive electrode core foil 6 Protective tape 7 Positive electrode mixture 21 Negative electrode 21a Negative winding start end 22 Negative electrode tab 23 Insulating tape 24 Negative electrode core foil

Claims (6)

At least a positive electrode tab provided on a metal core foil and a positive electrode coated with a positive electrode mixture containing a positive electrode active material for inserting and extracting lithium ions, and a negative electrode tab provided on the metal core foil A separator is disposed between the negative electrode and a negative electrode mixture containing a negative electrode active material that absorbs and releases lithium ions, and the positive electrode and the negative electrode are stacked and wound in a state in which they are insulated from each other by the separator, and then crushed. In a flat wound electrode body molded and formed, and in a laminated battery having a laminate exterior, a positive electrode mixture non-applied portion is provided on the front and back near the center in the longitudinal direction of the positive electrode, and one surface of the positive electrode mixture non-applied portion is provided. A positive electrode tab is welded to the positive electrode mixture, the exposed surface is covered with an insulating tape, and the other surface of the portion where the positive electrode mixture is not applied is covered with an insulating tape. 2. The laminated battery according to claim 1, wherein the positive electrode is cut at a positive electrode mixture application portion so that a core foil surface at the beginning and end of winding is not exposed. The laminated battery according to claim 1, wherein the laminated battery is a three-way sealed battery. The laminated battery according to claim 1, wherein the laminated battery has a polymer electrolyte. The laminated battery according to claim 1, wherein the negative electrode tab is located at the beginning of winding of the negative electrode. A method for manufacturing a laminated battery, comprising the following steps (1) to (4).
(1) a step of winding a positive electrode and a negative electrode through a separator to form a wound electrode body; (2) a step of crushing and shaping the wound electrode body to form a flat wound electrode body;
(3) laminating the wound electrode body and injecting an electrolyte solution;
(4) A step of pressing the wound electrode body coated with the laminate.

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