JP4404651B2 - battery - Google Patents

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JP4404651B2
JP4404651B2 JP2004024121A JP2004024121A JP4404651B2 JP 4404651 B2 JP4404651 B2 JP 4404651B2 JP 2004024121 A JP2004024121 A JP 2004024121A JP 2004024121 A JP2004024121 A JP 2004024121A JP 4404651 B2 JP4404651 B2 JP 4404651B2
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adhesive tape
electrode group
winding
wound
battery
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JP2005216754A (en
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和洋 北岡
武史 吉田
友哉 川畑
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Sanyo Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Description

本発明は、電池に係り,特に正電極、セパレータ及び負電極を巻回して形成された巻取電極群をテープ止めする際に、粘着テープを多層巻きしても活物質がハガレたり脱落したりするのを抑制するための構造に関する。   The present invention relates to a battery, and in particular, when a winding electrode group formed by winding a positive electrode, a separator and a negative electrode is taped, an active material may be peeled off or dropped even if the adhesive tape is wound in multiple layers. It is related with the structure for suppressing doing.

円筒型電池は、正電極と負電極とがセパレータを挟んだ構成となっており、例えばニッケル−水素蓄電池では、極板芯体に水酸化ニッケルの活物質を塗布して正電極を形成し、また極板芯体に水素吸蔵合金の活物質を塗布して負電極を形成している。   A cylindrical battery has a configuration in which a positive electrode and a negative electrode are sandwiched between separators.For example, in a nickel-hydrogen storage battery, a positive electrode is formed by applying a nickel hydroxide active material to an electrode plate core, A negative electrode is formed by applying an active material of a hydrogen storage alloy to the electrode plate core.

そして、正電極、セパレータ及び負電極を渦巻状に巻回して巻取電極群を形成する。この巻取電極群としては、大別して最外周がセパレータで覆われた最外周セパレータ構造と、最外周が負電極でむき出し状態の最外周負電極構造とに大別でき、最外周負電極構造の場合、巻取電極群は最外周に粘着テープを周回して巻取電極群がほどけるのを防止している。このような巻取電極群は、外装缶に挿入され電解液を注入して、外装缶の開口部を封口体で封止することにより作製される（例えば特許文献１、２参照）。
特開昭６０−１７０１７１号公報 特開平１０−２５５８１４号公報 And a winding electrode group is formed by winding a positive electrode, a separator, and a negative electrode spirally. The winding electrode group can be roughly divided into an outermost separator structure in which the outermost periphery is covered with a separator and an outermost periphery negative electrode structure in which the outermost periphery is exposed with a negative electrode. In this case, the winding electrode group is prevented from unwinding by winding an adhesive tape around the outermost periphery. Such a take-up electrode group is produced by inserting an electrolytic solution into an outer can and sealing the opening of the outer can with a sealing body (see, for example, Patent Documents 1 and 2).
JP-A-60-170171 JP-A-10-255814

しかしながら、上記従来の巻取電極群に粘着テープを周回して巻取電極群がほどけるのを防止した電池では、粘着テープを周回した際に活物質のハガレが生じ、脱落してしまう場合があり、歩留まりの低下等の要因となる問題があった。   However, in a battery that prevents the take-up electrode group from unwinding by winding the adhesive tape around the conventional take-up electrode group, the active material peels off when the adhesive tape is turned around and may fall off. There is a problem that causes a decrease in yield.

このようなハガレは以下のようにして発生する。即ち、粘着テープを周回する際には、加圧ローラで粘着テープを巻取電極群側に押しつけ、この状態で巻取電極群を回転させることにより貼付けるが、このとき粘着テープの厚みにより加圧ローラは粘着テープとのみ当接するようになり、このときの力で粘着テープに接する負電極が窪むことになりこれに起因して、粘着テープの端部側の活物質が浮上がりハガレを起こしてしまう。   Such peeling occurs as follows. That is, when the adhesive tape is circulated, the pressure-sensitive adhesive tape is pressed against the take-up electrode group side with a pressure roller and the take-up electrode group is rotated in this state. The pressure roller comes into contact only with the adhesive tape, and the negative electrode in contact with the adhesive tape is depressed by the force at this time, and as a result, the active material on the end side of the adhesive tape rises and peels off. I will wake you up.

特に、粘着テープを１回巻きしただけでは、十分に巻取電極群の支持ができないため、粘着テープを２回巻きする等の方法で確実に支持しようとすると、その分粘着テープの厚みも厚くなるので、負電極が加圧ローラから受ける力もこの厚みに応じて大きくなり、活物質のハガレが起きやすくなってしまう。   In particular, the winding electrode group cannot be sufficiently supported by only winding the adhesive tape once. Therefore, if the adhesive tape is securely supported by a method such as winding the adhesive tape twice, the thickness of the adhesive tape increases accordingly. Therefore, the force that the negative electrode receives from the pressure roller also increases in accordance with the thickness, and the active material is easily peeled off.

本発明は、前記実情に鑑みてなされたものであって、巻取電極群を備えた電池において、活物質のハガレや脱落を抑制できる粘着テープ構造を提供することを目的としている。   This invention is made | formed in view of the said situation, Comprising: It aims at providing the adhesive tape structure which can suppress the peeling of an active material, or dropping-off in the battery provided with the winding electrode group.

本発明の巻取電極群を備えた電池は、セパレータを挟んで正電極と負電極とを巻回して形成した巻取電極群を粘着テープで巻付けられており、前記粘着テープは、前記巻取電極群に1周以上巻付けられており、２周目以降は１周目からずれ成分をもつように巻付けられている。
この構成により、粘着テープの端部で活物質のハガレや生じようとしても、ずれ成分をもつように巻付けられた粘着テープによって、より大面積領域を押さえることができ、ハガレを抑制するので脱落を防止できることができる。
A battery including the winding electrode group of the present invention is formed by winding a winding electrode group formed by winding a positive electrode and a negative electrode with a separator in between, and the adhesive tape is wound around the winding tape . One or more turns are wound around the collecting electrode group, and the second and subsequent turns are wound so as to have a deviation component from the first turn .
The construction of this, even about to fail peeling and the active material at the end of the adhesive tape, the wound adhesive tape so as to have a shift component, it is possible to suppress the larger area region, so to suppress peeling Dropout can be prevented.

また本発明の電池は、前記粘着テープが、前記巻取電極群に1周以上巻付けられており、２周目以降は１周目からずれ成分を持つように巻き付けられているので、巻取電極群の端部をより強固に支持することができ、重なり部分を増大することなく止めることができる。
In the battery of the present invention, the adhesive tape is wound around the winding electrode group for one or more turns, and the second and subsequent turns are wound so as to have a deviation component from the first turn. The end of the electrode group can be supported more firmly, and can be stopped without increasing the overlapping portion.

また本発明の電池は、前記粘着テープは、端部で前記巻取電極群の中心軸に対して斜めに巻付けられているものを含む。
この構成により、粘着テープの端部で活物質のハガレや生じようとしても、斜めに巻付けられた粘着テープによって、より大面積領域を押さえることができる上、重なったとしても、大面積領域で重なっているため局所的な重なりを低減することができる。
Moreover, the battery of this invention contains what the said adhesive tape is wound diagonally with respect to the central axis of the said winding electrode group at an edge part.
With this configuration, even if an active material peels off or occurs at the end of the adhesive tape, the adhesive tape wound diagonally can hold a larger area, and even if it overlaps, Since they overlap, local overlap can be reduced.

また本発明の電池は、上層に位置する前記粘着テープが、これより下層に位置する前記粘着テープの端部を覆うように巻付けられている。
この構成により、上層の粘着テープが下層の粘着テープの端部を覆うようになるので、粘着テープの端部で活物質のハガレが生じようとしても、上層の粘着テープがこれを抑制するので脱落を防止できることとなる。
Moreover, the battery of this invention is wound so that the said adhesive tape located in an upper layer may cover the edge part of the said adhesive tape located in a lower layer from this .
The configuration of this, the upper layer of the adhesive tape comes to cover the end portion of the lower layer of the adhesive tape, even about to fail the peeling of the active material at the end of the adhesive tape, since the upper layer of the adhesive tape to suppress the It will be possible to prevent the dropout.

本発明の電池では、粘着テープの端部で活物質のハガレや生じようとしても、巻取電極群に1周以上巻付けられ、かつ２周目以降は１周目からずれ成分をもつように巻付けられた粘着テープによって、より大面積領域を押さえることができ、ハガレを抑制するので脱落を防止できることができる。
また、粘着テープが1周以上巻付けられた構造であるので、上層に位置する粘着テープがこれより下層に位置する粘着テープの端部を覆うように巻付けるので、粘着テープを多層巻きしても活物質のハガレや脱落が抑制できるという効果を有する巻取電極群を備えた電池を提供することができるものである。
In the battery of the present invention, even if an active material breaks or occurs at the end of the adhesive tape, it is wound around the winding electrode group by one or more turns , and the second and subsequent turns have a deviation component from the first turn. With the wound adhesive tape, a larger area can be pressed, and peeling can be prevented since peeling is suppressed.
In addition, since the adhesive tape is wound one or more times , the adhesive tape located in the upper layer is wrapped so as to cover the end of the adhesive tape located in the lower layer. In addition, it is possible to provide a battery provided with a winding electrode group having an effect that the active material can be prevented from peeling off or falling off .

以下、本発明の実施例を円筒型ニッケル水素電池を例に説明するが、本発明はニッケルカドミウム電池、リチウムイオン電池等の巻回して巻取電極群を形成し、これを粘着テープでテープ止めする構成に適用できる。また円筒系だけでなく、例えばリチウムイオン電池などの巻取った後に押潰したような形状の巻取電極群を使用した角形電池、短冊状の極板を束ねた角形電池など、電極が露出した状態の電極群を粘着テープにてばらけないように束ねて止める必要のある構成に適用可能である。   Examples of the present invention will be described below using a cylindrical nickel-metal hydride battery as an example. The present invention forms a wound electrode group by winding a nickel cadmium battery, a lithium ion battery, etc., and tapes this with an adhesive tape. Applicable to any configuration. In addition to cylindrical batteries, for example, prismatic batteries that use a winding electrode group that is crushed after being wound, such as lithium ion batteries, and rectangular batteries that are bundled with strip-shaped electrode plates are exposed. The present invention can be applied to a configuration in which the electrode group in a state needs to be bundled and stopped so as not to be separated by an adhesive tape.

（第1の実施の形態）
円筒型ニッケル水素電池は、正電極１１と負電極１２とがセパレータ１３を挟んだ構成となっており、これを図１に示す手順で巻回して巻取電極群を形成しており、この巻取電極群１６の中心軸に直行する垂線に対して角度αだけ傾いて粘着テープ１７が貼り付けられてする（図２（ａ）、（ｂ））。 (First embodiment)
The cylindrical nickel-metal hydride battery has a configuration in which a positive electrode 11 and a negative electrode 12 sandwich a separator 13, which is wound according to the procedure shown in FIG. 1 to form a winding electrode group. An adhesive tape 17 is attached with an inclination of an angle α with respect to a perpendicular perpendicular to the central axis of the collecting electrode group 16 (FIGS. 2A and 2B).

正電極１１は、パンチング鋼板にＮｉ焼結体を焼成した基板に、水酸化ニッケル（ＮｉＯ２）の活物質を含浸し保持させたいわゆる焼結式Ｎｉ正電極板で、その寸法は例えば５００ｍｍ×４８ｍｍ，厚み０．６ｍｍである。負電極１２は、パンチング鋼板に、水素吸蔵合金を糊料と共にペースト状にしたものを塗布し、乾燥して得られた水素吸蔵合金負電極板で、その寸法は例えば５５０ｍｍ×４８ｍｍ，厚み０．４ｍｍである。 The positive electrode 11 is a so-called sintered Ni positive electrode plate obtained by impregnating and holding an active material of nickel hydroxide (NiO 2 ) on a substrate obtained by firing a Ni sintered body on a punched steel plate, and its dimensions are, for example, 500 mm × 48 mm and thickness 0.6 mm. The negative electrode 12 is a hydrogen storage alloy negative electrode plate obtained by applying a paste of a hydrogen storage alloy to a punched steel sheet together with a paste and drying it. The dimensions of the negative electrode 12 are, for example, 550 mm × 48 mm, thickness 0. 4 mm.

そして、セパレータ１３としては、親水性を付与したポリプロピレン製不織布が用いられ、その寸法は例えば幅５０ｍｍ，目付８０ｇ／ｍ２である。 And as the separator 13, the nonwoven fabric made from the polypropylene which provided the hydrophilic property is used, The dimension is 50 mm in width and 80 g / m < 2 > of fabric weights, for example.

このような正電極１１、負電極１２を間にセパレータ１３を挟んで巻回する。そのとき、加圧ローラ１５ａは正電極１１に、加圧ローラ１５ｂは負電極１２に当接している（図１（ａ），図１（ｂ））。   Such a positive electrode 11 and a negative electrode 12 are wound with a separator 13 therebetween. At that time, the pressure roller 15a is in contact with the positive electrode 11 and the pressure roller 15b is in contact with the negative electrode 12 (FIGS. 1A and 1B).

巻取が完了して巻取電極群１６が形成されると、その上から幅５ｍｍ、厚み４０μｍのポリプロピレン製の粘着テープ１７を、両端から１０ｍｍの位置に２本に貼付ける（図１（ｃ），図１（ｄ））。   When the winding electrode group 16 is formed after the winding is completed, the adhesive tape 17 made of polypropylene having a width of 5 mm and a thickness of 40 μm is attached to two at 10 mm from both ends (FIG. 1 (c). ), FIG. 1 (d)).

このとき、粘着テープ１７は、図２（ｂ）に示すように巻取電極群１６の中心軸に直行する垂線に対して角度αだけ傾いて貼り付けている。この角度αとしてα＝１°に設定した。テープ止めが終わった時点で、上下の粘着テープ１７は最大約３ｍｍずれた状態となっている。   At this time, as shown in FIG. 2B, the adhesive tape 17 is attached with an inclination of an angle α with respect to a perpendicular line perpendicular to the central axis of the winding electrode group 16. This angle α was set to α = 1 °. At the time when the tape fixing is finished, the upper and lower adhesive tapes 17 are shifted by a maximum of about 3 mm.

なお図２（ａ）は、このようにしてテープ止めされた巻取電極群１６をもつ電池の一部破断斜視図、図２（ｂ）は、巻取電極群１６の上視図であり、図３は図２（ｂ）におけるＡＡ断面図である。但し、図３において巻取電極群１６は最外層の負電極１２のみ示している。   2 (a) is a partially broken perspective view of the battery having the winding electrode group 16 taped in this manner, and FIG. 2 (b) is a top view of the winding electrode group 16. FIG. 3 is a cross-sectional view taken along line AA in FIG. However, in FIG. 3, the winding electrode group 16 shows only the outermost negative electrode 12.

比較例として同様の方法で、上記角度αをα＝０°にした試料を作成した。図４は、このようにして形成された巻取電極群２０の上視図であり、図５は図４におけるＢＢ断面図である。巻取電極群２０は最外層の負電極１２のみ示している。   As a comparative example, a sample with the angle α set to α = 0 ° was prepared in the same manner. 4 is a top view of the winding electrode group 20 formed as described above, and FIG. 5 is a cross-sectional view taken along the line BB in FIG. The winding electrode group 20 shows only the outermost negative electrode 12.

本願発明に係る巻取電極群１６と比較例の巻取電極群２０とを比較すると、比較例の巻取電極群２０は、粘着テープ１７の端部で活物質１２がパンチング鋼板１８から盛り上がり、またハガレを生じていることがわかる。   When the winding electrode group 16 according to the present invention is compared with the winding electrode group 20 of the comparative example, the winding electrode group 20 of the comparative example is such that the active material 12 rises from the punched steel plate 18 at the end of the adhesive tape 17, It can also be seen that peeling has occurred.

一方、本発明にかかる巻取電極群１６は、１周目の粘着テープ１７の端部の活物質１２にひび割れが発生しているものの、その上の２周目の粘着テープ１７が、この活物質１２を覆っているので、ハガレまで成長していない。従って、比較例の巻取電極群２０は活物質の脱落が起きるが、本発明の巻取電極群１６にはそのような恐れがない。   On the other hand, in the wound electrode group 16 according to the present invention, although the active material 12 at the end of the first round adhesive tape 17 is cracked, the second round adhesive tape 17 is the active tape 12. Since the substance 12 is covered, it has not grown until the peeling. Therefore, the winding electrode group 20 of the comparative example causes the active material to fall off, but the winding electrode group 16 of the present invention has no such fear.

ところで、巻取電極群１６に巻かれた左右の２本の粘着テープ１７は、巻取電極群１６の中央側に傾いて巻取られている。これは粘着テープ１７を貼付けたときの応力は、巻取電極群１６の端部側では端部を介して逃げるのに対し、中央側はこのような逃げ場が無いため、粘着テープ１７の中央側端部で活物質のハガレが生じや易くなり、これを防止するためである。
 Incidentally, the two adhesive tapes 17 of the right and left wound winding electrode group 16 is wound inclined to the center side of the winding electrode group 16. This is because the stress when the adhesive tape 17 is affixed escapes through the end portion on the end side of the winding electrode group 16, whereas the center side does not have such a escape place. This is to prevent the active material from being easily peeled off at the end.

従って、上記説明においては、巻取電極群１６の中心軸に直行する垂線に対して傾けた角度αをα＝１°になるようにしたが、この角度αは２周目の粘着テープ１７が１周目の粘着テープ１７の中央側端部を覆うようにするための条件であり、製造する巻取電極群１６の外周距離や巻取周回数によって適宜設定される設定値である。   Therefore, in the above description, the angle α tilted with respect to the perpendicular perpendicular to the central axis of the winding electrode group 16 is set to α = 1 °, but this angle α is determined by the adhesive tape 17 in the second round. This is a condition for covering the center side end of the adhesive tape 17 in the first round, and is a set value that is appropriately set according to the outer peripheral distance and the number of winding rounds of the winding electrode group 16 to be manufactured.

この角度αを大きくしすぎて、２周目の粘着テープ１７が１周目の粘着テープ１７に重ならない状態になると、本発明の効果を得ることができず、また負電極１２にだけ粘着テープ１７が貼られている状態となるので巻止力が弱くなって、巻取電極群１６がばらけてしまう恐れがあることは上記説明から明らかである。   If the angle α is excessively increased so that the second round adhesive tape 17 does not overlap the first round adhesive tape 17, the effect of the present invention cannot be obtained, and the adhesive tape is applied only to the negative electrode 12. It is clear from the above description that the winding force is weakened because the 17 is applied, and the winding electrode group 16 may be scattered.

以上説明したように、巻取電極群１６を粘着テープ１７でテープ止めする際には、上層の粘着テープ１７が下層の粘着テープ１７の中央側端部を覆うようにすることで、活物質のハガレや滑落を抑制し、又防止することが可能になり、歩留まりが向上する。   As described above, when the take-up electrode group 16 is taped with the adhesive tape 17, the upper adhesive tape 17 covers the center side end of the lower adhesive tape 17, thereby It is possible to suppress or prevent peeling and sliding, and the yield is improved.

（参考例の形態）
前記第1の実施の形態では、巻き始めは中心軸に対して垂直に形成し巻き止りのみで斜めに形成したが、参考例として、図６（ａ）に示すように中心軸に対して斜めになるように半周程度粘着テープ１７を巻取電極群１６に貼り付けておくようにしてもよい。
この構成によっても、強固に支持することができる。また、粘着テープが周回しない程度の長さで斜め成分をもつように巻付けられているため、重なり領域をもたなくても強固に固定することができる上、粘着テープの存在に起因する高さの高い領域が分散されることになり、最外周の活物質と外装缶との接触性も良好となる。
また、中心軸に対して斜めになるように２〜３周程度粘着テープ１７を巻取電極群１６に貼り付けておくようにしてもよい。この場合は重なり領域をもたない上、大面積領域で固定することができる、粘着テープの存在に起因する高さの高い領域が分散されることになり、最外周の活物質と外装缶との接触性の低下も大きな問題とならない。
更にまた図６（ｂ）に示すように、巻取電極群１６に対して斜めに粘着テープ１６を貼り付け形成し、巻きとまり１７Ｅが中心軸に垂直方向となるように形成しても良い。
(Form of reference example )
In the first embodiment, the winding start is formed perpendicularly to the central axis and formed obliquely only by the winding stop. However, as a reference example, as shown in FIG. The adhesive tape 17 may be affixed to the winding electrode group 16 so as to have a half circumference.
This structure can also be supported firmly. In addition, since the adhesive tape is wound so as to have an oblique component with a length that does not circulate, it can be firmly fixed without having an overlapping region, and the high pressure caused by the presence of the adhesive tape. A high area | region will be disperse | distributed and the contact property of the outermost active material and an exterior can will also become favorable.
Alternatively, the adhesive tape 17 may be attached to the take-up electrode group 16 so as to be inclined with respect to the central axis. In this case, there is no overlapping area, and the high area due to the presence of the adhesive tape that can be fixed in a large area area will be dispersed, and the outermost active material and the outer can The decrease in contactability is not a big problem.
Further, as shown in FIG. 6 (b), the adhesive tape 16 may be attached to the winding electrode group 16 at an angle so that the winding stop 17E is perpendicular to the central axis.

本発明の巻取電極群を備えた電池は、活物質のハガレや滑落を抑制し、また防止する効果を有し、巻取電極群を粘着テープで支持した電池に有用である。   The battery provided with the winding electrode group of the present invention has an effect of suppressing and preventing peeling of the active material and slipping, and is useful for a battery in which the winding electrode group is supported by an adhesive tape.

本発明の第1の実施の形態の巻取電極群の製造工程を示す図である。FIG. 3 is a diagram showing a manufacturing process of the winding electrode group according to the first embodiment of the present invention. 粘着テープを周回した巻取電極群をもつ電池および同巻取電極群の上視図である。It is a top view of the battery which has the winding electrode group which wound the adhesive tape, and the winding electrode group. 図２（ｂ）におけるＡＡ断面図である。It is AA sectional drawing in FIG.2 (b). 比較例における粘着テープを周回した後の巻取電極群の上視図である。It is a top view of the winding electrode group after circulating the adhesive tape in a comparative example. 図４におけるＢＢ断面図である。It is BB sectional drawing in FIG. 参考例の形態の電池で用いられる巻取電極群の粘着テープ貼着構造を示す図である。It is a figure which shows the adhesive tape sticking structure of the winding electrode group used with the battery of the form of a reference example .

符号の説明Explanation of symbols

１１ 正電極
１２ 活物質
１２ 負電極
１３ セパレータ
１５ａ，１５ｂ 加圧ローラ
１６ 巻取電極群
１７ 粘着テープ
１７Ｅ 粘着テープの巻きとまり DESCRIPTION OF SYMBOLS 11 Positive electrode 12 Active material 12 Negative electrode 13 Separator 15a, 15b Pressure roller 16 Winding electrode group 17 Adhesive tape 17E Winding of adhesive tape

Claims (2)

セパレータを挟んで正電極と負電極とを巻回して形成した巻取電極群を粘着テープで巻付けられており、前記粘着テープは、前記巻取電極群に1周以上巻付けられており、２周目以降は１周目からずれ成分をもつように、かつ上層に位置する前記粘着テープが、これより下層に位置する前記粘着テープの端部を覆うように巻付けられていることを特徴とする電池。 A winding electrode group formed by winding a positive electrode and a negative electrode across a separator is wound with an adhesive tape, and the adhesive tape is wound around the winding electrode group by one or more rounds, The adhesive tape located in the upper layer is wound so as to cover the end of the adhesive tape located in the lower layer so as to have a deviation component from the first circle in the second and subsequent rounds. Battery. 前記粘着テープは、端部で前記巻取電極群の中心軸に対して斜めに巻付けられていることを特徴とする請求項１に記載の電池。The battery according to claim 1, wherein the adhesive tape is wound obliquely with respect to a central axis of the winding electrode group at an end portion.
JP2004024121A 2004-01-30 2004-01-30 battery Expired - Fee Related JP4404651B2 (en)

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