JP2016015212A - Secondary battery - Google Patents

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JP2016015212A
JP2016015212A JP2014135708A JP2014135708A JP2016015212A JP 2016015212 A JP2016015212 A JP 2016015212A JP 2014135708 A JP2014135708 A JP 2014135708A JP 2014135708 A JP2014135708 A JP 2014135708A JP 2016015212 A JP2016015212 A JP 2016015212A
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tape
laminate
secondary battery
flat
fixing
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JP6355160B2 (en
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真佑子 喜志
Mayuko Kishi
真佑子 喜志
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Envision AESC Energy Devices Ltd
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NEC Energy Devices 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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Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery which is hard to crease or distort a length of tape for fixing a laminate.SOLUTION: A secondary battery comprises: a laminate 3 arranged by alternately laminating positive electrodes 1 and negative electrodes 2 with a separator 4 interposed therebetween; and pieces of tape 5 for fixing the laminate 3. Each piece of tape 5 has: a pair of sticking-to-plane parts 5a provided at opposing ends thereof, and stuck to outermost layers 3a of the laminate 3 respectively; and a mid part 5b located between the paired sticking-to-plane parts 5a and stuck to corresponding side edges 3b of layers of the laminate 3. The paired sticking-to-plane parts 5a each have a tapered form with an acute angle at its leading end.

Description

本発明は二次電池に関する。   The present invention relates to a secondary battery.

リチウムイオン二次電池等の二次電池は、エネルギー密度が高く、かつメモリー効果が無いため、小型でも高容量であり、携帯電話やデジタルカメラなどの携帯機器用の電源として用いられている。また、二次電池は環境保全の面からも注目を集めており、ハイブリッド自動車や電気自動車などの電源としても用いられている。これらの電源においては、更なる小型化が要求され、それに伴い二次電池の小型化および薄膜化が要求されている。
近年では、図６に示すように、シート状の正極１と負極２がセパレータ４を介して交互に積層された積層体（電池素子）３をテープ５で固定した上で外装容器内に収容した構成の積層型二次電池が使用されている。特許文献１に記載されている二次電池の積層体固定用のテープ５は、幅が一定の細長い帯状である。テープ５の両端部、すなわち積層体３の最外層の平面に貼り付けられる平面貼り付け部５ａは矩形状である。それに対し、特許文献２では、積層体固定用のテープの両端の平面貼り付け部が、矩形の一部が切り欠かれた非矩形状である。これは、正極の活物質層と負極の活物質層が対向している対向領域に局所的な荷重が加わるのを抑制するためである。 A secondary battery such as a lithium ion secondary battery has a high energy density and no memory effect. Therefore, the secondary battery is small and has a high capacity, and is used as a power source for portable devices such as a mobile phone and a digital camera. Secondary batteries are also attracting attention from the viewpoint of environmental protection, and are also used as power sources for hybrid vehicles and electric vehicles. In these power supplies, further downsizing is required, and accordingly, downsizing and thinning of the secondary battery are required.
In recent years, as shown in FIG. 6, a laminate (battery element) 3 in which sheet-like positive electrodes 1 and negative electrodes 2 are alternately laminated via separators 4 is fixed with a tape 5 and then accommodated in an outer container. A stacked type secondary battery having a configuration is used. The secondary battery stack fixing tape 5 described in Patent Document 1 has an elongated strip shape with a constant width. The flat pasting portions 5a that are pasted to both ends of the tape 5, that is, the flat surface of the outermost layer of the laminate 3 are rectangular. On the other hand, in patent document 2, the flat sticking part of the both ends of the tape for laminated body fixation is non-rectangular shape by which a part of rectangle was notched. This is to prevent a local load from being applied to the facing region where the positive electrode active material layer and the negative electrode active material layer face each other.

特開２０１３−０４８０５４号公報JP 2013-048054 A 特開２０１４−００７１０３号公報JP 2014-007103 A

特許文献１に示すように幅が一定の細長い帯状のテープ５が用いられ、その両端の平面貼り付け部５ａが積層体３の最外層に貼り付けられる場合、テープ５に皺や歪みが生じるおそれがあった。図７に示すように、テープ５に皺や歪みが生じると、テープ５の中間部５ｂと積層体３の各層の側端縁との間に隙間（遊び）が生じて、積層体３の安定した固定が困難になるおそれがある。その場合、例えば正極１と負極２が適切な位置関係で重なり合わず、所望の積層状態が確保できない可能性がある。また、テープ５が歪んで接着面同士が互いに接着して、テープ５に強固で修復困難な皺が生じる可能性がある。そして、特許文献２に記載された発明では、テープの両端部に切り欠き部を設けるためにテープの製造や加工が煩雑になるとともに、切り欠き部を起点としてテープの皺や歪みが生じ易くなる。
テープ５の皺や遊びが生じると、図７に示すように、ラミネートフィルム８によって積層体３を挟み込んで外装容器を構成する際に、テープ５の一部がラミネートフィルム８同士の間に挟まれて、ラミネートフィルム８同士の接合面積が小さくなって接合強度が低くなる。その結果、外装容器の封止が不十分になるおそれがある。
このように、積層体３がテープ５によって安定して固定されず所望の積層状態が確保できなかったり、外装容器の封止が不十分であったりすると、二次電池の性能が悪くなる。
そこで、本発明の目的は、前述した課題を解決して、積層体を固定するためのテープに皺や歪みが生じにくい二次電池を提供することにある。 As shown in Patent Document 1, when a strip-like tape 5 having a constant width is used and the flat pasting portions 5a at both ends thereof are stuck to the outermost layer of the laminate 3, there is a risk that wrinkles or distortion may occur in the tape 5. was there. As shown in FIG. 7, when wrinkles or distortion occurs in the tape 5, a gap (play) is generated between the intermediate portion 5 b of the tape 5 and the side edge of each layer of the laminate 3, thereby stabilizing the laminate 3. May be difficult to fix. In that case, for example, the positive electrode 1 and the negative electrode 2 do not overlap with each other in an appropriate positional relationship, and a desired stacked state may not be ensured. In addition, the tape 5 may be distorted and the adhesive surfaces may be bonded to each other, and the tape 5 may be hard and difficult to repair. In the invention described in Patent Document 2, since the notch portions are provided at both ends of the tape, the manufacture and processing of the tape become complicated, and the wrinkles and distortion of the tape easily occur from the notch portions. .
When wrinkles or play of the tape 5 occurs, a part of the tape 5 is sandwiched between the laminate films 8 when the laminate 3 is sandwiched between the laminate films 8 to form an outer container as shown in FIG. As a result, the bonding area between the laminate films 8 is reduced and the bonding strength is reduced. As a result, there is a possibility that sealing of the outer container becomes insufficient.
Thus, when the laminated body 3 is not stably fixed by the tape 5 and a desired laminated state cannot be secured, or the sealing of the outer container is insufficient, the performance of the secondary battery is deteriorated.
Therefore, an object of the present invention is to solve the above-described problems and provide a secondary battery in which wrinkles and distortion are unlikely to occur in a tape for fixing a laminate.

本発明の二次電池は、正極と負極とがセパレータを介して交互に積層された積層体と、積層体を固定するテープと、を含む。テープは、両端部に設けられて積層体の両最外層にそれぞれ貼り付けられる１対の平面貼り付け部と、１対の平面貼り付け部の間に位置し、積層体の各層の側端縁に貼り付けられる中間部と、を有する。平面貼り付け部は、先端が鋭角である先細形状を有している。   The secondary battery of this invention contains the laminated body on which the positive electrode and the negative electrode were laminated | stacked alternately via the separator, and the tape which fixes a laminated body. The tape is positioned between a pair of flat surface bonding portions that are provided at both ends and are respectively bonded to both outermost layers of the laminated body, and a pair of flat surface bonding portions, and the side edge of each layer of the laminated body And an intermediate portion to be attached to. The flat pasting portion has a tapered shape with a sharp tip.

本発明によると、積層体を固定するためのテープに皺や歪みが生じにくい二次電池を提供することができる。   According to the present invention, it is possible to provide a secondary battery in which wrinkles and distortion hardly occur in a tape for fixing a laminate.

本発明の二次電池の一実施形態の積層体およびテープの斜視図である。It is a perspective view of the laminated body and tape of one Embodiment of the secondary battery of this invention. 図１に示す積層体の分解斜視図である。It is a disassembled perspective view of the laminated body shown in FIG. 図１に示すテープの平面形状を示す平面図である。It is a top view which shows the planar shape of the tape shown in FIG. 図１に示す積層体およびテープを含む二次電池の要部を示す断面図である。It is sectional drawing which shows the principal part of the secondary battery containing the laminated body and tape shown in FIG. 本発明の二次電池に含まれるテープの種々の変形例を示す平面図である。It is a top view which shows the various modifications of the tape contained in the secondary battery of this invention. 関連技術の二次電池の積層体およびテープの斜視図である。It is a perspective view of the laminated body and tape of a secondary battery of related technology. 図６に示す積層体およびテープを含む二次電池の要部を示す断面図である。It is sectional drawing which shows the principal part of the secondary battery containing the laminated body and tape shown in FIG.

以下、本発明の実施の形態について、図面を参照して説明する。
図１は、本発明の二次電池の一実施形態の積層体（電池素子）３およびテープ５の斜視図である。図２は、この積層体３の分解斜視図である。二次電池は、正極１と負極２がセパレータ４を介して交互に積層された積層体３が、積層体固定用のテープ５によって固定された状態で、図示しない電解液とともに外装容器内に収容された構成である。正極１から延びている正極タブ７と、負極２から延びている負極タブ６は、外装容器の外側に突出している。
正極１と負極２とセパレータ４の積層体３は、積層体固定用のテープ５によって固定されている。本実施形態では、４つのテープ５が設けられている。テープ５は、積層体３の両最外層３ａにそれぞれ貼り付けられる１対の平面貼り付け部５ａと、１対の平面貼り付け部５ａの間に位置する中間部５ｂを有する。中間部５ｂは、積層体３の各層の側端縁３ｂに貼り付けられる。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a laminate (battery element) 3 and a tape 5 according to an embodiment of the secondary battery of the present invention. FIG. 2 is an exploded perspective view of the laminate 3. The secondary battery is housed in an outer container together with an electrolyte solution (not shown) in a state in which a laminate 3 in which positive electrodes 1 and negative electrodes 2 are alternately laminated via separators 4 is fixed with a tape 5 for fixing the laminate. It is the structure which was made. A positive electrode tab 7 extending from the positive electrode 1 and a negative electrode tab 6 extending from the negative electrode 2 protrude outside the outer casing.
The laminate 3 of the positive electrode 1, the negative electrode 2, and the separator 4 is fixed with a tape 5 for fixing the laminate. In the present embodiment, four tapes 5 are provided. The tape 5 includes a pair of flat surface bonding portions 5a that are respectively bonded to both outermost layers 3a of the laminate 3 and an intermediate portion 5b that is positioned between the pair of flat surface bonding portions 5a. The intermediate portion 5 b is attached to the side edge 3 b of each layer of the stacked body 3.

図３に示すように、本実施形態のテープ５は平行四辺形の平面形状を有している。具体的には、矩形状の中間部（側端縁貼り付け部）５ｂの両側に、三角形状の平面貼り付け部５ａがそれぞれ設けられている。両端部に位置する平面貼り付け部５ａは、中間部５ｂよりも小面積である。そして、平面貼り付け部５ａは、先端が鋭角である先細形状をそれぞれ有している。この構成によると、平面貼り付け部５ａが小面積であるため、貼り付け作業が容易かつ短時間で行える。しかも、先端が鋭角な先細形状であるため、皺や歪みが生じにくい。その結果、図４に示すように、テープ５の中間部５ｂと積層体３の側端縁３との間に隙間（遊び）が生じず、積層体３を安定して固定でき、正極１と負極２が適切な位置関係で重なり合った所望の積層状態が確保できる。また、テープ５の接着面同士が互いに接着する危険性が小さい。そして、平面貼り付け部５ａに小さな切り欠きが設けられているわけではないので、テープ５の製造や加工は簡単で、テープ５の皺や歪みの起点となる部分が存在しない。従って、ラミネートフィルム８によって積層体３を覆って外装容器を構成する際に、テープ５の一部がラミネートフィルム８同士の間に挟まれるおそれが小さく、外装容器を十分強固に封止できる。このように、本実施形態では、テープ５の皺や歪み等により二次電池の性能が悪くなることが抑えられる。
テープ５は、積層体３が外装容器内に収納されるまでの間しっかりと固定することを主な目的として設けられているため、必ずしも、積層体３が外装容器内に収容された後も永続的に強い固定力を発揮する必要はない。従って、テープ５は、積層体３を一時的に固定できる最低限の接着強度があればよい。そのため、平面貼り付け部５ａの面積が小さくても問題は生じない。 As shown in FIG. 3, the tape 5 of the present embodiment has a parallelogram planar shape. Specifically, triangular planar pasting portions 5a are respectively provided on both sides of a rectangular intermediate portion (side edge pasting portion) 5b. The flat pasting portions 5a located at both ends have a smaller area than the intermediate portion 5b. The flat pasting portion 5a has a tapered shape with a sharp tip. According to this configuration, since the flat pasting portion 5a has a small area, the pasting operation can be performed easily and in a short time. In addition, since the tip has a sharp tapered shape, wrinkles and distortion are less likely to occur. As a result, as shown in FIG. 4, there is no gap (play) between the intermediate portion 5b of the tape 5 and the side edge 3 of the laminate 3, and the laminate 3 can be stably fixed. A desired stacked state in which the negative electrodes 2 overlap with each other in an appropriate positional relationship can be ensured. Further, the risk that the adhesive surfaces of the tape 5 adhere to each other is small. And since the small notch is not provided in the flat sticking part 5a, manufacture and a process of the tape 5 are easy, and the part used as the starting point of the wrinkles and distortion of the tape 5 does not exist. Therefore, when the laminate 3 is covered with the laminate film 8 to configure the exterior container, there is little possibility that a part of the tape 5 is sandwiched between the laminate films 8 and the exterior container can be sealed sufficiently firmly. Thus, in this embodiment, it is suppressed that the performance of the secondary battery is deteriorated due to wrinkles or distortion of the tape 5.
The tape 5 is provided mainly for the purpose of firmly fixing the laminated body 3 until it is accommodated in the outer container. Therefore, the tape 5 is not necessarily permanent even after the laminated body 3 is accommodated in the outer container. It is not necessary to exert strong fixing force. Accordingly, the tape 5 only needs to have a minimum adhesive strength that can temporarily fix the laminate 3. Therefore, no problem occurs even if the area of the flat pasting portion 5a is small.

本実施形態のテープ５のより具体的な例（実施例１）について説明すると、このテープ５の平面形状は、互いに対向する長辺Ｌがそれぞれ１７．３５ｍｍであって、長辺Ｌに直交する高さＨが１０ｍｍの平行四辺形である。このテープ５の一方の平面貼り付け部５ａを、積層体３の一方の最外層（最上面）３ａに貼り付け、中間部５ｂを積層体３の各層の側端縁３ｂに貼り付け、他方の平面貼り付け部５ａを、積層体３の他方の最外層（最下面）３ａに貼り付けた。
図３に示すテープ５を積層体３に貼り付ける作業を８回行って、貼り付け作業に要する時間の平均と、電池を完成させるまでに不良が発生した数を求め、テープ５の総面積とともに表１に示している。 A more specific example (Example 1) of the tape 5 of the present embodiment will be described. The planar shape of the tape 5 is such that the long sides L facing each other are 17.35 mm and are orthogonal to the long side L. It is a parallelogram with a height H of 10 mm. One flat pasting portion 5a of the tape 5 is stuck to one outermost layer (uppermost surface) 3a of the laminate 3, and the intermediate portion 5b is stuck to the side edge 3b of each layer of the laminate 3, The flat pasting portion 5 a was pasted on the other outermost layer (lowermost surface) 3 a of the laminate 3.
The tape 5 shown in FIG. 3 is affixed to the laminated body 8 eight times, and the average time required for the affixing work and the number of defects that have occurred until the battery is completed are obtained together with the total area of the tape 5 It is shown in Table 1.

Figure 2016015212
Figure 2016015212

図５には、本発明の二次電池のテープ５の種々の変形例を示している。
図５（ａ）に示す例（実施例２）では、テープ５の平面形状は、上底が１０ｍｍ、下底（全長）が２７ｍｍであって、上底および下底に直交する高さが１０ｍｍの台形である。このテープ５を実施例１と同様に積層体３に貼り付ける作業を８回行って、貼り付け作業に要する時間の平均と、電池を完成させるまでに不良が発生した数と、テープ５の総面積を表１に示している。
図５（ｂ）に示す例（実施例３）では、テープ５の平面形状は、１辺が１０ｍｍで、長い方の対角線（全長）が２７ｍｍの菱形である。このテープ５を実施例１と同様に積層体３に貼り付ける作業を８回行って、貼り付け作業に要する時間の平均と、電池を完成させるまでに不良が発生した数と、テープ５の総面積を表１に示している。
図５（ｃ）に示す例（実施例４）では、テープ５の平面形状は、両端部に位置する平面貼り付け部５ａがそれぞれ底辺１０ｍｍで高さ１０ｍｍの二等辺三角形であって、２つの平面貼り付け部５ａとそれらの間に位置する矩形状の中間部５ｂとを合わせた全長が２７ｍｍの六角形である。このテープ５を実施例１と同様に積層体３に貼り付ける作業を８回行って、貼り付け作業に要する時間の平均と、電池を完成させるまでに不良が発生した数と、テープ５の総面積を表１に示している。
図５（ｄ）に示す例（実施例５）では、テープ５の平面形状は、底辺（全長）２７ｍｍで高さ１０ｍｍの二等辺三角形である。このテープ５を実施例１と同様に積層体３に貼り付ける作業を８回行って、貼り付け作業に要する時間の平均と、電池を完成させるまでに不良が発生した数と、テープ５の総面積を表１に示している。 FIG. 5 shows various modifications of the tape 5 of the secondary battery of the present invention.
In the example (Example 2) shown in FIG. 5A, the planar shape of the tape 5 is such that the upper base is 10 mm, the lower base (full length) is 27 mm, and the height orthogonal to the upper and lower bases is 10 mm. It is a trapezoid. The tape 5 was affixed to the laminate 3 in the same manner as in Example 1, and the average time required for the affixing work, the number of defects before the battery was completed, The area is shown in Table 1.
In the example (Example 3) shown in FIG. 5B, the planar shape of the tape 5 is a rhombus whose one side is 10 mm and whose longer diagonal (full length) is 27 mm. The tape 5 was affixed to the laminate 3 in the same manner as in Example 1, and the average time required for the affixing work, the number of defects before the battery was completed, The area is shown in Table 1.
In the example (Example 4) shown in FIG. 5C, the planar shape of the tape 5 is an isosceles triangle in which the flat pasting portions 5a located at both ends are 10 mm in base and 10 mm in height. The total length of the flat pasting portion 5a and the rectangular intermediate portion 5b located between them is a hexagon having a total length of 27 mm. The tape 5 was affixed to the laminate 3 in the same manner as in Example 1, and the average time required for the affixing work, the number of defects before the battery was completed, The area is shown in Table 1.
In the example (Example 5) shown in FIG. 5D, the planar shape of the tape 5 is an isosceles triangle having a base (full length) of 27 mm and a height of 10 mm. The tape 5 was affixed to the laminate 3 in the same manner as in Example 1, and the average time required for the affixing work, the number of defects before the battery was completed, The area is shown in Table 1.

以上説明した実施例１〜５と対比するための比較例として、図６に示すテープと実質的に同じである、幅１０ｍｍで全長２７ｍｍの細長い帯状のテープ５を実施例１と同様に積層体３に貼り付ける作業を８回行って、貼り付け作業に要する時間の平均と、電池を完成させるまでに不良が発生した数と、テープ５の総面積を表１に示している。   As a comparative example for comparison with Examples 1 to 5 described above, a strip-like tape 5 having a width of 10 mm and a total length of 27 mm, which is substantially the same as the tape shown in FIG. Table 1 shows the average time required for the pasting work, the number of defects occurring before the battery is completed, and the total area of the tape 5.

これらの実施例１〜５と比較例の結果を示す表１を見ると、実施例１〜５のテープ５は、比較例と比べて面積が小さく、貼り付け作業に要する時間が短い。これは、比較例のテープ５では、積層体３の最外層に貼り付けられる平面貼り付け部５ａの面積が大きいため、テープ５に遊びが生じて貼り付けにくいのに対し、実施例１〜５では、平面貼り付け部５ａの面積が小さく、テープ５に遊びが生じにくいためであると考えられる。そして、実施例１〜５では、比較例に比べてテープ５の総面積が約２５〜５０％小さいにもかかわらず、剥離等の不良が発生することなく十分に安定的に積層体３を固定できることがわかる。   When Table 1 which shows the result of these Examples 1-5 and a comparative example is seen, the area | region of the tape 5 of Examples 1-5 is small compared with a comparative example, and the time which affixing operation | work is short. This is because the tape 5 of the comparative example has a large area of the flat pasting portion 5a to be stuck to the outermost layer of the laminated body 3, and thus the tape 5 has play and is difficult to stick. Then, it is considered that the area of the flat pasting portion 5a is small and play does not easily occur in the tape 5. And in Examples 1-5, although the total area of the tape 5 is about 25-50% small compared with a comparative example, the laminated body 3 is fixed stably enough, without generating defects, such as peeling. I understand that I can do it.

このように、本発明によると、積層体３を一時的に固定するために必要な接着強度を保ちながら、テープ５に皺や歪みが生じにくくすることができる。それにより、テープ５の貼り付け不良や、外装容器を構成するラミネートフィルム８の接合部にテープ５が挟み込まれることで生じる接合強度低下による不良の発生を防ぐことができる。また、テープ５の面積が小さく効率的な形状にすることで製造や加工のコストの低減と生産性向上を図ることができる。さらに、テープ５が小面積で積層体３に貼り付け易いため、積層体３への貼り付け作業に要する時間が短縮できる。   As described above, according to the present invention, it is possible to prevent wrinkles and distortion from occurring in the tape 5 while maintaining the adhesive strength necessary for temporarily fixing the laminate 3. Accordingly, it is possible to prevent the occurrence of defects due to poor bonding strength of the tape 5 and a decrease in bonding strength caused by the tape 5 being sandwiched between the bonded portions of the laminate film 8 constituting the exterior container. Further, by making the tape 5 have a small area and an efficient shape, it is possible to reduce manufacturing and processing costs and improve productivity. Furthermore, since the tape 5 has a small area and can be easily attached to the laminate 3, the time required for the attaching operation to the laminate 3 can be shortened.

１ 正極
２ 負極
３ 電池素子（積層体）
３ａ 最外層
３ｂ 側端縁
４ セパレータ
５ テープ
５ａ 平面貼り付け部
５ｂ 中間部（側端縁貼り付け部） DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Negative electrode 3 Battery element (laminated body)
3a Outermost layer 3b Side edge 4 Separator 5 Tape 5a Plane pasting part 5b Middle part (side edge pasting part)

Claims (4)

正極と負極とがセパレータを介して交互に積層された積層体と、前記積層体を固定するテープと、を含み、
前記テープは、両端部に設けられて前記積層体の両最外層にそれぞれ貼り付けられる１対の平面貼り付け部と、前記１対の平面貼り付け部の間に位置し、前記積層体の各層の側端縁に貼り付けられる中間部と、を有し、
前記平面貼り付け部は、先端が鋭角である先細形状を有している、二次電池。 A laminate in which positive and negative electrodes are alternately laminated via separators, and a tape for fixing the laminate,
The tape is positioned between a pair of flat surface bonding portions provided at both ends and bonded to both outermost layers of the laminate, and each layer of the laminate. An intermediate portion to be attached to the side edge of the
The flat pasting portion is a secondary battery having a tapered shape with a sharp tip. 前記平面貼り付け部は前記中間部よりも小面積である、請求項１に記載の二次電池。   The secondary battery according to claim 1, wherein the flat pasting portion has a smaller area than the intermediate portion. 前記平面貼り付け部は、前記先端に向かって連続的に幅が細くなっている、請求項１または２に記載の二次電池。   The secondary battery according to claim 1, wherein the flat pasting portion has a width that continuously decreases toward the tip. 前記テープの全体の平面形状は、平行四辺形、台形、菱形、三角形、または六角形である、請求項１から３のいずれか１項に記載の二次電池。   4. The secondary battery according to claim 1, wherein the entire planar shape of the tape is a parallelogram, trapezoid, rhombus, triangle, or hexagon. 5.
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