JP5535465B2 - Non-aqueous electrolyte secondary battery - Google Patents
Non-aqueous electrolyte secondary battery Download PDFInfo
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- JP5535465B2 JP5535465B2 JP2008276390A JP2008276390A JP5535465B2 JP 5535465 B2 JP5535465 B2 JP 5535465B2 JP 2008276390 A JP2008276390 A JP 2008276390A JP 2008276390 A JP2008276390 A JP 2008276390A JP 5535465 B2 JP5535465 B2 JP 5535465B2
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- 239000011255 nonaqueous electrolyte Substances 0.000 title claims description 21
- 239000000203 mixture Substances 0.000 claims description 41
- 239000004743 Polypropylene Substances 0.000 claims description 9
- -1 polypropylene Polymers 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 238000004804 winding Methods 0.000 description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011883 electrode binding agent Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002482 conductive additive Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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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- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
本発明は、巻回型の非水電解液二次電池に関するものである。 The present invention relates to a wound type non-aqueous electrolyte secondary battery.
携帯機器等の小型電子機器の電源として巻回型のリチウムイオン二次電池が用いられている。これらの電池の正極には、例えば、アルミニウム箔からなる帯状の正極集電体に正極活物質を塗布したものが用いられており、また負極には、銅箔からなる帯状の負極集電体に負極活物質を塗布したものが用いられている。そして正極及び負極を、セパレータを介して多数巻回して製作した電池要素を円筒状の電池缶に収納し、あるいは糸巻き状に巻回した電池要素を扁平状に成形して角型状の電池缶に収納し、電解液を注入した後に封止して非水電解液二次電池が製造される。 A wound lithium ion secondary battery is used as a power source for small electronic devices such as portable devices. For the positive electrode of these batteries, for example, a strip-shaped positive electrode current collector made of aluminum foil is applied with a positive electrode active material, and the negative electrode is made of a strip-shaped negative electrode current collector made of copper foil. A material coated with a negative electrode active material is used. A battery element produced by winding a number of positive electrodes and negative electrodes through a separator is housed in a cylindrical battery can, or a battery element wound in a wound form is formed into a flat shape to form a square battery can And a non-aqueous electrolyte secondary battery is manufactured by sealing after injecting the electrolyte.
電極製造の際には、活物質を集電体に塗布した後にロールプレスにより塗布部を圧縮するが、活物質に伸びが生じ、内部応力が発生する。これを電極幅に切断すると、残留応力が作用して電極全体に反りが生じてしまう問題があった。 In manufacturing the electrode, the active material is applied to the current collector and then the applied portion is compressed by a roll press. However, the active material is stretched and internal stress is generated. When this is cut into the electrode width, there is a problem that the residual stress acts and the entire electrode is warped.
この問題を解決し反りを生じなくするために、ロールプレス後に塗布部の幅方向の端部を切断除去してリード部を形成するとともに残留応力を除去して反りを防いでいることが特許文献１に記載されている。 In order to solve this problem and prevent warping, it is possible to prevent the warpage by removing the residual stress and forming the lead portion by cutting and removing the end portion in the width direction of the coating portion after the roll press. 1.
従来、巻回型のリチウムイオン二次電池を製造する場合は、一度反った電極を巻回する際に、反りを矯正するのは困難なので、電極合剤層未塗布部の全体をガイドしながら電極を巻回部に挿入していた。 Conventionally, when manufacturing a wound type lithium ion secondary battery, it is difficult to correct the warp when winding a once warped electrode, so guide the entire electrode mixture layer uncoated part. The electrode was inserted into the winding part.
電極タブが溶接された電極を有する巻回型電池においては、電極合剤層塗布部の幅方向の端部を切断除去して内部応力を除去しているが、その切断幅を広げて残留応力を完全に除去することは、生産性を下げることになり対応に苦慮していた。 In a wound battery having an electrode with an electrode tab welded, the internal stress is removed by cutting and removing the end portion in the width direction of the electrode mixture layer application part, but the residual stress is increased by widening the cutting width. The complete removal of the product lowered productivity and made it difficult to cope with it.
電極合剤層塗布部の幅方向端部の切断除去が不十分な場合には、電極合剤層塗布部の幅方向の端部を切断除去しても残留応力が完全には除去されない恐れがあるので、電極に力が加わっていない状態では、重量の軽い電極合剤層未塗布部が反る可能性があった。そして電極を巻回部に挿入する工程では、電極タブが溶接されていない電極合剤層未塗布部が反る現象が発生し、巻回の際に電極が巻きずれて不良品となり、歩留まりが低下する問題があった。 If cutting and removal of the end portion in the width direction of the electrode mixture layer application portion is insufficient, residual stress may not be completely removed even if the end portion in the width direction of the electrode mixture layer application portion is cut and removed. Therefore, in the state where no force is applied to the electrode, there is a possibility that the lightly applied electrode mixture layer uncoated portion is warped. In the process of inserting the electrode into the winding part, a phenomenon occurs in which the electrode mixture layer uncoated part where the electrode tab is not welded is warped, and the electrode is unwound during winding, resulting in a defective product, and the yield is increased. There was a problem of lowering.
図２は、従来工法の電極の平面図である。電極は、電極合剤層未塗布部１、電極合剤層片面塗布部２と電極合剤層両面塗布部４で構成される。電極合剤層未塗布部１には巻回後に缶ケース蓋に接続する為の電極タブ５が溶接されており、電極タブ５は電極タブ引き出し部５ａと電極タブ接続部５ｂからなっている。電極を巻回装置の巻回部に挿入する方向が電極挿入方向Ｃである。電極が反っている場合には、電極合剤層未塗布部の全体をガイドしながら電極を電極挿入方向Ｃに挿入していた。
FIG. 2 is a plan view of a conventional electrode. The electrode includes an electrode mixture layer non-applied
図３は、図２のＡ（右側面）方向から見た側面図である。電極タブ５が溶接されている側と逆の左側の電極合剤層未塗布部が上方に反っている。集電体に電極合剤層８を塗布した後にロールプレスを行い所望の厚さにする際、電極合剤層８の塗布部の幅方向の端部を切断除去することによって残留応力を除去するが、完全に除去されないと、電極タブが溶接されていない電極合剤層未塗布部が反る現象が発生し易い。
FIG. 3 is a side view seen from the direction A (right side surface) of FIG. The electrode mixture layer uncoated portion on the left side opposite to the side on which the
図４は、図２のＢ（正面）方向から見た反りのない状態を示す正面図である。集電体６に電極合剤層８が塗布されていて、電極には電極合剤層未塗布部１、電極合剤層片面塗布部２と電極合剤層両面塗布部４がある。電極合剤層未塗布部１には巻回後に缶ケース蓋に接続する為の電極タブ５が溶接されている。
FIG. 4 is a front view showing a state without warping as seen from the B (front) direction of FIG. An
巻回装置に電極を挿入する場合は、通常、反りに該当する電極合剤層未塗布部全体をガイドしながら巻回部に挿入しているが、設備調整に大幅な工数がかかっており、工数削減のため電極構造を改善することが求められていた。また、電極に反りがあると、反った部分がガイドやセパレータに触れ真っ直ぐに挿入されない場合がしばしばあり、真っ直ぐに挿入されなければ巻きずれ不良となり、歩留り低下を招いていた。 When inserting the electrode into the winding device, it is usually inserted into the winding part while guiding the entire electrode mixture layer uncoated part corresponding to the warp, but it takes a lot of man-hours for equipment adjustment, There has been a demand for improving the electrode structure to reduce the number of steps. In addition, when the electrode is warped, the warped portion often touches the guide or the separator and is not inserted straight, and if it is not inserted straight, winding deviation becomes poor, resulting in a decrease in yield.
すなわち、本発明の技術的課題は、電極合剤層未塗布部に反りが無く、巻回部への電極挿入が容易に行われることにより、巻回の際に電極が巻きずれない非水電解液二次電池を提供することにある。 That is, the technical problem of the present invention is that there is no warpage in the electrode mixture layer uncoated part, and the electrode can be easily inserted into the winding part, so that the electrode does not slip during winding. The object is to provide a liquid secondary battery.
本発明の非水電解液二次電池は、集電体の両面に電極合剤層が形成され、前記集電体の長さ方向の一方の端部に電極合剤層の未塗布部を有し、前記未塗布部の集電体幅方向の上部に電極タブが溶接され引き出され、前記未塗布部のうち、集電体幅方向に関し前記未塗布部の下端から前記電極タブの下端までの下部領域にのみポリプロピレン絶縁テープを貼付した正極と負極を、セパレータを介して巻回し外装体に収納してなる。前記ポリプロピレン絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．３倍以上、１．０倍以下であり、前記ポリプロピレン絶縁テープの厚みは、前記電極タブの厚みの０．３倍以上、１．０倍以下であることを特徴とする。 In the non-aqueous electrolyte secondary battery of the present invention, an electrode mixture layer is formed on both sides of a current collector, and an uncoated portion of the electrode mixture layer is provided at one end in the length direction of the current collector. The electrode tab is welded and pulled out to the upper part of the current collector width direction of the uncoated part, and, of the uncoated part, from the lower end of the uncoated part to the lower end of the electrode tab in the current collector width direction. A positive electrode and a negative electrode with a polypropylene insulating tape attached only to the lower region are wound through a separator and accommodated in an exterior body. The size of the polypropylene insulating tape in the current collector width direction is not less than 0.3 times and not more than 1.0 times the width of the current collector width excluding the electrode tab connection portion, and the thickness of the polypropylene insulating tape is: It is 0.3 to 1.0 times the thickness of the electrode tab.
本発明によれば、電極合剤層未塗布部に反りが無く、巻回部への電極挿入が容易に行われることにより、巻回の際に電極が巻きずれない非水電解液二次電池が得られる。 According to the present invention, the non-aqueous electrolyte secondary battery in which the electrode mixture layer uncoated part is not warped and the electrode is easily inserted into the winding part so that the electrode is not wound during winding. Is obtained.
本発明の実施の形態を説明する。 An embodiment of the present invention will be described.
本発明の非水電解液二次電池は、負極活物質、負極結着剤、場合によって導電助剤を含む負極合剤層を負極集電体上に形成した負極と、正極活物質、正極結着剤、導電助剤を含む正極合剤層を正極集電体上に形成した正極を、セパレータを介して巻回し外装体に収納して非水電解液を注液したのち封止して製造する。なお正極には正極タブを、負極には負極タブを巻回する前にそれぞれ溶接しておく。 The non-aqueous electrolyte secondary battery of the present invention includes a negative electrode in which a negative electrode active material, a negative electrode binder, and a negative electrode mixture layer containing a conductive auxiliary agent in some cases are formed on a negative electrode current collector, a positive electrode active material, and a positive electrode binder. A positive electrode in which a positive electrode mixture layer containing an adhesive and a conductive additive is formed on a positive electrode current collector is wound through a separator, housed in an exterior body, injected with a non-aqueous electrolyte, and then sealed. To do. The positive electrode is welded to the positive electrode tab and the negative electrode is wound before the negative electrode tab is wound.
図１は、本発明の電極合剤層未塗布部に絶縁テープを貼り付けた電極の平面図である。電極タブ５は電極タブ引き出し部５ａと電極タブ接続部５ｂからなっており、電極タブ５の下方の電極合剤層未塗布部１に絶縁テープ３が貼り付けられている。
FIG. 1 is a plan view of an electrode in which an insulating tape is attached to an uncoated portion of the electrode mixture layer of the present invention. The
絶縁テープは、正極または負極の電極合剤層未塗布部に貼付することができる。絶縁テープの貼り付けは、電極合剤層未塗布部であって、電極タブと重ならず、電極からはみ出さない位置にするのが好ましい。電極タブと重なった位置に絶縁テープを貼り付けた場合は、重なった絶縁テープの厚みが製品の厚みに直接影響を及ぼす為に、巻回した電池要素の厚みが厚くなったり、厚みのバラツキが大きくなったりし、歩留まりが低下するためである。また、電極からはみ出さない位置に貼付するのは、ゴミ等が絶縁テープ粘着部に付着するのを防止するためである。 The insulating tape can be affixed to the positive or negative electrode mixture layer uncoated portion. The insulating tape is preferably applied to the electrode mixture layer uncoated portion so that it does not overlap the electrode tab and does not protrude from the electrode. When insulating tape is applied at the position where it overlaps with the electrode tab, the thickness of the overlapping insulating tape directly affects the thickness of the product, so the thickness of the wound battery element increases or the thickness varies. This is because the size is increased and the yield is lowered. Further, the reason why the sticking is performed at a position where it does not protrude from the electrode is to prevent dust and the like from adhering to the insulating tape adhesive portion.
絶縁テープの材質に関しては、耐熱性と耐電解液性を考慮してポリプロピレン又はポリイミドが好適である。 With respect to the material of the insulating tape, polypropylene or polyimide is preferable in consideration of heat resistance and electrolytic solution resistance.
絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．３倍以上、１．０倍以下であるのが好ましい。絶縁テープの集電体幅方向のサイズが集電体幅から電極タブ接続部を除いた幅の０．３倍より小さい場合には、反りが抑制されない恐れがあり、集電体幅から電極タブ接続部を除いた幅の１．０倍より大きい場合には、電極タブと重なるか又は電極からはみ出すからである。なお、集電体幅から電極タブ接続部を除いた幅が３０ｍｍである場合、絶縁テープの集電体幅方向のサイズは１０ｍｍ以上、２０ｍｍ以下が特に好ましい。 The size of the insulating tape in the current collector width direction is preferably 0.3 to 1.0 times the width of the current collector width excluding the electrode tab connection portion. If the size of the insulating tape in the width direction of the current collector is smaller than 0.3 times the width of the current collector, excluding the electrode tab connection, warping may not be suppressed. This is because when it is larger than 1.0 times the width excluding the connecting portion, it overlaps the electrode tab or protrudes from the electrode. In addition, when the width | variety remove | excluding the electrode tab connection part from the collector width is 30 mm, the size of the collector tape in the collector width direction is especially preferably 10 mm or more and 20 mm or less.
絶縁テープの集電体長さ方向のサイズは、電極が反らず、電極合剤層未塗布部に貼付されるサイズであればよい。 The size of the insulating tape in the length direction of the current collector may be any size as long as the electrode is not warped and is attached to the electrode mixture layer uncoated portion.
絶縁テープの厚みは、電極タブの厚みの０．３倍以上、１．０倍以下であることが好ましい。絶縁テープの厚みが電極タブの厚みの０．３倍より薄い場合には、絶縁テープは電極の反りを抑制出来ない恐れがあり、電極タブの厚みの１．０倍より厚い場合には、電池要素が厚くなり製品設計上好ましくないからである。電極タブの厚みが７０μm以上、１００μｍ以下の場合には、絶縁テープの厚みは３０μm以上、６０μｍ以下であるのが特に好ましい。 The thickness of the insulating tape is preferably not less than 0.3 times and not more than 1.0 times the thickness of the electrode tab. When the thickness of the insulating tape is thinner than 0.3 times the thickness of the electrode tab, the insulating tape may not be able to suppress the warping of the electrode. When the thickness of the insulating tab is thicker than 1.0 times, the battery This is because the element becomes thick and is not preferable in the product design. When the thickness of the electrode tab is 70 μm or more and 100 μm or less, the thickness of the insulating tape is particularly preferably 30 μm or more and 60 μm or less.
このように、絶縁テープを貼り付けることにより電極の反りを抑制するためには、絶縁テープの重量と絶縁テープのこしが重要である。すなわちテープの面積を増やすことで、重量を増やして、また許容できる範囲で厚みを増やすことで、こしを強くして反りを抑制することができる。その結果、巻回部への電極挿入が容易に行われることにより、巻回の際に電極が巻きずれない非水電解液二次電池を作製することができる。 Thus, in order to suppress the warping of the electrode by applying the insulating tape, the weight of the insulating tape and the strain of the insulating tape are important. That is, by increasing the area of the tape, the weight can be increased, and the thickness can be increased within an allowable range, whereby the strain can be strengthened and warpage can be suppressed. As a result, the electrode can be easily inserted into the winding part, so that a non-aqueous electrolyte secondary battery in which the electrode does not slip during winding can be manufactured.
設備上の対応としては、電池素子の巻回装置にて絶縁テープ貼付機能を付加することが効果的であり、生産性を向上させることができる。 In terms of facilities, it is effective to add an insulating tape attaching function with a battery element winding device, and productivity can be improved.
以下に本発明の実施例を詳述する。 Examples of the present invention are described in detail below.
（実施例１）
コバルト酸リチウムを９４質量部と、ＰＶｄＦを３質量部と、導電性カーボン３質量部を混合して、正極材料とした。この正極材料をＮ−メチル−２−ピロリドンに分散させてスラリー状とした。得られたスラリーを厚さ１５μｍのアルミ箔上に塗布し、乾燥後、厚さ１６０μｍの正極体を得た。
Example 1
94 parts by mass of lithium cobaltate, 3 parts by mass of PVdF, and 3 parts by mass of conductive carbon were mixed to obtain a positive electrode material. This positive electrode material was dispersed in N-methyl-2-pyrrolidone to form a slurry. The obtained slurry was applied onto an aluminum foil having a thickness of 15 μm, and after drying, a positive electrode body having a thickness of 160 μm was obtained.
炭素材料粉末を９６質量部と、ＰＶｄＦを３質量部と、導電性カーボン１質量部を混合して、負極材料とした。この負極材料をＮ−メチル−２−ピロリドンに分散させてスラリー状とした。得られたスラリーを厚さ１０μｍの銅箔上に塗布し、乾燥後、厚さ１３０μｍの負極体を得た。 96 parts by mass of carbon material powder, 3 parts by mass of PVdF, and 1 part by mass of conductive carbon were mixed to obtain a negative electrode material. This negative electrode material was dispersed in N-methyl-2-pyrrolidone to form a slurry. The obtained slurry was applied on a copper foil having a thickness of 10 μm, and after drying, a negative electrode body having a thickness of 130 μm was obtained.
正極体に４×２０ｍｍ、厚さ７０μｍのアルミタブを溶接し、さらに１５×１５ｍｍ、厚さ５０μｍのポリプロピレン絶縁テープを、アルミタブに接触しないアルミ箔部に貼付して正極とした。負極体に４×２０ｍｍ、厚さ７０μｍのニッケルタブを溶接し、さらに１５×１５ｍｍ、厚さ５０μｍのポリプロピレン絶縁テープを、ニッケルタブに接触しない銅箔部に貼付して負極とした。なお集電体幅から電極タブ接続部を除いた幅は、正負極ともに３３ｍｍであり、絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．４５倍であり、絶縁テープの厚みは電極タブの厚みの０．７倍であった。正極と負極を、セパレータを介して、電極合剤層未塗布部をガイドせずに巻回部に挿入して巻回し巻き止めテープを重ねて電池素子を作製した。 An aluminum tab having a thickness of 4 × 20 mm and a thickness of 70 μm was welded to the positive electrode body, and a polypropylene insulating tape having a thickness of 15 × 15 mm and a thickness of 50 μm was attached to the aluminum foil portion not in contact with the aluminum tab to obtain a positive electrode. A 4 × 20 mm nickel tab having a thickness of 70 μm was welded to the negative electrode body, and a polypropylene insulating tape having a thickness of 15 × 15 mm and a thickness of 50 μm was attached to a copper foil portion not in contact with the nickel tab to obtain a negative electrode. The width excluding the electrode tab connecting portion from the current collector width is 33 mm for both positive and negative electrodes, and the size of the insulating tape in the current collector width direction is 0 of the width excluding the electrode tab connecting portion from the current collector width. The thickness of the insulating tape was 0.7 times the thickness of the electrode tab. The positive electrode and the negative electrode were inserted into the winding part through the separator without guiding the electrode mixture layer non-coated part, wound, and the anti-tape tape was stacked to produce a battery element.
次いで、電池缶に電池素子を収納し、電解液を注液後に封止して非水電解液二次電池を作製した。 Next, the battery element was accommodated in a battery can, and the electrolyte solution was injected and sealed to prepare a non-aqueous electrolyte secondary battery.
巻回装置にて電極を巻回して非水電解液二次電池３００個を作製したが、巻きずれは発生せず、巻回に起因する不良はなかった。 The electrode was wound with a winding device to produce 300 non-aqueous electrolyte secondary batteries, but no winding deviation occurred, and there was no defect due to winding.
（実施例２）
正極体及び負極体に貼付した絶縁テープの大きさを１０×１０ｍｍとした以外は実施例１と同様にして、非水電解液二次電池を作製した。なお絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．３倍であり、絶縁テープの厚みは電極タブの厚みの０．７倍であった。
(Example 2)
A nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the size of the insulating tape attached to the positive electrode body and the negative electrode body was 10 × 10 mm. The size of the insulating tape in the width direction of the current collector is 0.3 times the width of the current collector, excluding the electrode tab connection, and the thickness of the insulating tape is 0.7 times the thickness of the electrode tab. It was.
巻回装置にて電極を巻回して非水電解液二次電池３００個を作製したが、巻きずれは発生せず、巻回に起因する不良はなかった。 The electrode was wound with a winding device to produce 300 non-aqueous electrolyte secondary batteries, but no winding deviation occurred, and there was no defect due to winding.
（実施例３）
正極体及び負極体に貼付した絶縁テープの大きさを１０×１０ｍｍとし、正極体及び負極体に貼付した絶縁テープの厚みを２０μｍとした以外は実施例１と同様にして、非水電解液二次電池を作製した。なお絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．３倍であり、絶縁テープの厚みは電極タブの厚みの０．３倍であった。
(Example 3)
In the same manner as in Example 1, except that the size of the insulating tape attached to the positive electrode body and the negative electrode body was 10 × 10 mm and the thickness of the insulating tape attached to the positive electrode body and the negative electrode body was 20 μm, the nonaqueous electrolyte solution 2 A secondary battery was produced. The size of the insulating tape in the current collector width direction is 0.3 times the width of the current collector minus the electrode tab connection, and the thickness of the insulating tape is 0.3 times the thickness of the electrode tab. It was.
巻回装置にて電極を巻回して非水電解液二次電池３００個を作製したが、巻きずれは発生せず、巻回に起因する不良はなかった。 The electrode was wound with a winding device to produce 300 non-aqueous electrolyte secondary batteries, but no winding deviation occurred, and there was no defect due to winding.
（実施例４）
正極体及び負極体に貼付した絶縁テープの大きさを１０×３０ｍｍとし、正極体及び負極体に貼付した絶縁テープの厚みを７０μｍとした以外は実施例１と同様にして、非水電解液二次電池を作製した。なお絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．９倍であり、絶縁テープの厚みは電極タブの厚みの１．０倍であった。
Example 4
In the same manner as in Example 1, except that the size of the insulating tape attached to the positive electrode body and the negative electrode body was 10 × 30 mm, and the thickness of the insulating tape attached to the positive electrode body and the negative electrode body was 70 μm, the nonaqueous electrolyte solution 2 A secondary battery was produced. The size of the insulating tape in the current collector width direction is 0.9 times the width of the current collector minus the electrode tab connection, and the thickness of the insulating tape is 1.0 times the thickness of the electrode tab. It was.
巻回装置にて電極を巻回して非水電解液二次電池３００個を作製したが、巻きずれは発生せず、巻回に起因する不良はなかった。 The electrode was wound with a winding device to produce 300 non-aqueous electrolyte secondary batteries, but no winding deviation occurred, and there was no defect due to winding.
（比較例）
正極体及び負極体に絶縁テープを貼付しない以外は実施例１と同様にして、非水電解液二次電池を作製した。
(Comparative example)
A nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the insulating tape was not applied to the positive electrode body and the negative electrode body.
巻回装置にて電極を巻回して非水電解液二次電池３００個を作製したところ、巻きずれが４個発生し、不良となった。 When 300 electrodes of the non-aqueous electrolyte secondary battery were produced by winding the electrode with a winding device, 4 winding deviations occurred, resulting in failure.
以上に示したように、本発明により、反りの無い電極が得られるので、電極を巻回装置に挿入することが容易になり、セパレータに触れる事は無く、真っ直ぐに挿入された。 As described above, according to the present invention, an electrode having no warpage can be obtained, so that it is easy to insert the electrode into the winding device, and the electrode is inserted straight without touching the separator.
すなわち、電極合剤層未塗布部に反りが無く、巻回部への電極挿入が容易に行われることにより、巻回の際に電極が巻きずれない非水電解液二次電池が得られた。 That is, there was no warpage in the electrode mixture layer uncoated part, and the electrode was easily inserted into the winding part, so that a non-aqueous electrolyte secondary battery in which the electrode did not slip during winding was obtained. .
１ 電極合剤層未塗布部
２ 電極合剤層片面塗布部
３ 絶縁テープ
４ 電極合剤層両面塗布部
５ 電極タブ
５ａ 電極タブ引き出し部
５ｂ 電極タブ接続部
６ 集電体
７ 反り
８ 電極合剤層
Ｃ 電極挿入方向
DESCRIPTION OF
Claims (1)
前記ポリプロピレン絶縁テープの集電体幅方向のサイズは、集電体幅から電極タブ接続部を除いた幅の０．３倍以上、１．０倍以下であり、
前記ポリプロピレン絶縁テープの厚みは、前記電極タブの厚みの０．３倍以上、１．０倍以下であることを特徴とする非水電解液二次電池。 An electrode mixture layer is formed on both sides of the current collector, the electrode mixture layer has an uncoated portion at one end in the length direction of the current collector, and the current collector width direction of the uncoated portion An electrode tab welded to the upper part of the electrode, and a positive electrode with a polypropylene insulating tape attached only to a lower region from the lower end of the uncoated part to the lower end of the electrode tab in the width direction of the current collector among the uncoated parts A non-aqueous electrolyte secondary battery in which a negative electrode is wound through a separator and stored in an exterior body,
The size of the polypropylene insulating tape in the current collector width direction is not less than 0.3 times and not more than 1.0 times the width excluding the electrode tab connection portion from the current collector width,
The non-aqueous electrolyte secondary battery is characterized in that the thickness of the polypropylene insulating tape is not less than 0.3 times and not more than 1.0 times the thickness of the electrode tab.
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| JP4069988B2 (en) * | 1996-08-30 | 2008-04-02 | 日立マクセル株式会社 | Lithium ion secondary battery |
| JP2954147B1 (en) * | 1998-03-20 | 1999-09-27 | 日本電気株式会社 | Explosion-proof secondary battery |
| JP2003086234A (en) * | 2001-09-13 | 2003-03-20 | Mitsubishi Electric Corp | Battery |
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| JP2006302509A (en) * | 2005-04-15 | 2006-11-02 | Sanyo Electric Co Ltd | Battery |
| JP2008027831A (en) * | 2006-07-25 | 2008-02-07 | Matsushita Electric Ind Co Ltd | Battery |
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| CN109888164A (en) * | 2019-04-16 | 2019-06-14 | 珠海冠宇电池有限公司 | A kind of battery pole ear with insulating layer |
| CN111293315A (en) * | 2020-02-25 | 2020-06-16 | 东莞塔菲尔新能源科技有限公司 | Method for preventing electrode lug from being inserted reversely and reducing battery cell failure |
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