JP5756638B2 - Square battery electrode unit - Google Patents

Square battery electrode unit Download PDF

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JP5756638B2
JP5756638B2 JP2011011802A JP2011011802A JP5756638B2 JP 5756638 B2 JP5756638 B2 JP 5756638B2 JP 2011011802 A JP2011011802 A JP 2011011802A JP 2011011802 A JP2011011802 A JP 2011011802A JP 5756638 B2 JP5756638 B2 JP 5756638B2
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electrode body
battery
protective case
electrode
insulating member
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JP2012155888A (en
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雨堤　徹
徹 雨堤
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Ａｍａｚ技術コンサルティング合同会社
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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

Description

本発明は、角形電池の内部構造、特には、角形電池に用いられる電極体ユニットの構造に関する。   The present invention relates to the internal structure of a prismatic battery, and more particularly to the structure of an electrode body unit used for a prismatic battery.

従来、携帯電話やデジタルカメラのような小型携帯機器用の電源として、スペース効率に優れる角形電池が広く使用されてきた。また、近年、ハイブリッド自動車のような車両搭載用の二次電池や、太陽光発電のような自然エネルギー発電におけるロードレベリング用の大型二次電池としても、電池設置の際のスペース効率に優れる角形電池が広く採用されている。   Conventionally, square batteries with excellent space efficiency have been widely used as power sources for small portable devices such as mobile phones and digital cameras. In recent years, square batteries with excellent space efficiency when installing batteries are also used as secondary batteries for vehicles such as hybrid cars and large secondary batteries for load leveling in natural energy power generation such as solar power generation. Is widely adopted.

かかる角形電池の電極体としては、シート状の電極を複数積層した積層型や、巻き取った電極群を扁平状にプレスした巻取りプレス型のものが、一般的に用いられている（例えば、特許文献１、２）。いずれのタイプにおいても、一般的に、電極体を構成した後に電極体の一部に絶縁性の粘着テープを貼付することによりセパレータを介して対向する正極体と負極体とを固定し、さらに、必要に応じて、内部短絡を防止するための絶縁性テープを貼付している。   As the electrode body of such a rectangular battery, a laminated type in which a plurality of sheet-like electrodes are laminated, or a winding press type in which a wound electrode group is pressed into a flat shape are generally used (for example, Patent Documents 1 and 2). In any type, in general, after constituting the electrode body, by fixing an insulating adhesive tape to a part of the electrode body, the positive electrode body and the negative electrode body facing each other through the separator are fixed, If necessary, an insulating tape for preventing an internal short circuit is applied.

特開２００９−２８３１４１号公報JP 2009-283141 A 特開２０００−２５１８６６号公報JP 2000-251866 A

しかし、このように、テープによって電極体の保護を図る場合、工程数が増大するのみならず、電極体の機械的強度が十分確保できず、後の電池組立工程、例えば電極体の外装体への挿入工程における生産効率が低くなる。   However, in this way, when protecting the electrode body with the tape, not only the number of processes increases, but the mechanical strength of the electrode body cannot be sufficiently secured, and the subsequent battery assembly process, for example, to the exterior body of the electrode body The production efficiency in the insertion process is reduced.

また、電極体にテープを貼付した場合、テープが貼付された部分のみが強く緊迫され、正極体と負極体との接触圧が不均一となる。複数の異なるテープが貼付された場合には、テープ同士の重畳部分の緊迫度がさらに大きくなる。このように電極体における緊迫度が不均一となることにより、電池の長期充放電サイクル性能が低下するとともに、テープの重畳部分が生じるために電極体の寸法公差を大きく取る必要があるので、電池のエネルギー密度が低下するという問題があった。   Moreover, when a tape is affixed to an electrode body, only the part where the tape was affixed is strongly tightened, and the contact pressure of a positive electrode body and a negative electrode body becomes non-uniform | heterogenous. When a plurality of different tapes are affixed, the degree of tension of the overlapping portion between the tapes is further increased. As the degree of tension in the electrode body becomes non-uniform in this way, the long-term charge / discharge cycle performance of the battery deteriorates, and a tape overlap portion is generated, so it is necessary to increase the dimensional tolerance of the electrode body. There was a problem that the energy density of the lowering.

本発明の目的は、上記の課題を解決するために、電極体の固定および機械的な保護を行う絶縁性のケースによって電極体を覆うことにより、この電極体ユニットが用いられる角形電池の生産効率を向上させるとともに、当該電池のエネルギー密度、長期充放電サイクル性能などの電池性能を向上させることにある。   The object of the present invention is to solve the above problems by covering the electrode body with an insulating case that fixes and mechanically protects the electrode body, thereby producing the production efficiency of the rectangular battery in which this electrode body unit is used. And improving battery performance such as energy density and long-term charge / discharge cycle performance of the battery.

前記した目的を達成するために、本発明に係る角形電池用電極体ユニットは、セパレータを介して対向する正極体および負極体からなる電極体であって、前記正極体と負極体との対向方向に直交する平坦な表面を有する電極体と、平板状の絶縁性部材を加工して形成された、前記電極体との少なくとも一部を覆う直方体形状の保護ケースとを備え、前記保護ケースの前記絶縁性部材の重畳部分が、前記電極体の前記平坦な表面を覆わないように設定されている。   In order to achieve the above-described object, an electrode body unit for a rectangular battery according to the present invention is an electrode body composed of a positive electrode body and a negative electrode body facing each other via a separator, and the facing direction of the positive electrode body and the negative electrode body An electrode body having a flat surface perpendicular to the electrode body, and a rectangular parallelepiped protective case formed by processing a flat insulating member and covering at least a part of the electrode body, The overlapping portion of the insulating member is set so as not to cover the flat surface of the electrode body.

この構成によれば、電極体を平板状の絶縁性部材からなる保護ケースによって覆うので、粘着テープを用いることなく電極体を固定し、かつ機械的に保護することができる。これにより、電極体を角形電池外装体に挿入する作業が確実かつ容易となるなど、電池の生産効率が向上し、その結果、電池の製造コストが低減される。さらには、粘着テープの重畳部分を考慮した大きな寸法公差を設定する必要がないので、電池のエネルギー密度が増大する。また、正極体と負極体の対向方向に保護ケースの重畳部分が存在せず、電極体の緊迫度、つまり正極体と負極体との接触圧が均一となるので、電池の長期充放電サイクル性能が向上する。   According to this configuration, since the electrode body is covered by the protective case made of a flat insulating member, the electrode body can be fixed and mechanically protected without using an adhesive tape. Thereby, the production efficiency of the battery is improved, for example, the operation of inserting the electrode body into the rectangular battery exterior body is surely and easy, and as a result, the manufacturing cost of the battery is reduced. Furthermore, since it is not necessary to set a large dimensional tolerance in consideration of the overlapping portion of the adhesive tape, the energy density of the battery increases. In addition, there is no overlapping part of the protective case in the opposite direction of the positive electrode body and the negative electrode body, and the degree of tightness of the electrode body, that is, the contact pressure between the positive electrode body and the negative electrode body is uniform, so the long-term charge / discharge cycle performance of the battery Will improve.

なお、一般的に、ケースを二重化すると、その厚み分だけ電池容量をロスするようにも考えられているが、外装体の内部に電極体を覆うケースを設けることにより、電極体表面がフラット化するので、外装体との間のクリアランスマージンを低減することができる。したがって、電極体自体の厚みに大きな影響を与えることがないので、上述のように、むしろ電池容量を増大することが可能になる。   In addition, it is generally considered that when the case is doubled, the battery capacity is lost by the thickness, but the surface of the electrode body is flattened by providing a case that covers the electrode body inside the exterior body. Therefore, the clearance margin between the exterior body can be reduced. Therefore, since the thickness of the electrode body itself is not greatly affected, as described above, the battery capacity can be increased.

本発明の一実施形態に係る角形電池用電極体ユニットにおいて、前記保護ケースに、この保護ケースの内方に電解液を導入する導入孔が設けられていることが好ましい。この構成によれば、予め保護ケースに電解液を注入しておく必要がなく、従来と同様に電池の外装体に注液することにより角形電池を作製することができるので、追加の設備が不要となる。   In the rectangular battery electrode body unit according to the embodiment of the present invention, it is preferable that the protective case is provided with an introduction hole for introducing an electrolytic solution inside the protective case. According to this configuration, it is not necessary to inject an electrolytic solution into the protective case in advance, and a rectangular battery can be produced by injecting the battery into the battery case as in the conventional case, so no additional equipment is required. It becomes.

本発明の一実施形態に係る角形電池用電極体ユニットにおいて、前記平板状の絶縁性部材が、１ＧＰａ以上の腰強度および１０Ｎ以上の突き刺し強度を有する樹脂によって形成されていることが好ましい。この構成によれば、電極体をより確実に機械的に保護することができるので、電池の信頼性が向上する。   In the rectangular battery electrode body unit according to an embodiment of the present invention, the flat insulating member is preferably formed of a resin having a waist strength of 1 GPa or more and a puncture strength of 10 N or more. According to this configuration, since the electrode body can be mechanically protected more reliably, the reliability of the battery is improved.

本発明の一実施形態に係る角形電池用電極体ユニットにおいて、前記平板状の絶縁部材が透明または半透明な素材によって形成されていることが好ましい。この構成によれば、目視によって保護ケース内の電極体の不具合を確認することができるので、電池の製造コストが抑制される。   In the rectangular battery electrode body unit according to an embodiment of the present invention, the flat insulating member is preferably formed of a transparent or translucent material. According to this structure, since the defect of the electrode body in a protective case can be confirmed visually, the manufacturing cost of a battery is suppressed.

本発明の一実施形態に係る角形電池用電極体ユニットにおいて、前記保護ケースの外表面に潤滑処理が施されていることが好ましい。この構成によれば、電極体ユニットを電池の外装体に挿入させる作業が一層容易となるので、電池の製造コストが一層低減される。   In the rectangular battery electrode unit according to the embodiment of the present invention, it is preferable that the outer surface of the protective case is lubricated. According to this configuration, the operation of inserting the electrode body unit into the battery exterior body becomes easier, and the manufacturing cost of the battery is further reduced.

以上のように、本発明に係る角形電池用電極体ユニットによれば、電極体の固定および機械的な保護を行う絶縁性のケースによって電極体を覆うことにより、この電極体ユニットが用いられる角形電池の生産効率が向上するとともに、当該電池のエネルギー密度、長期充放電サイクル性能などの電池性能が向上する。   As described above, according to the electrode body unit for a rectangular battery according to the present invention, the electrode body unit is used by covering the electrode body with an insulating case that fixes and mechanically protects the electrode body. The battery production efficiency is improved, and the battery performance such as the energy density and long-term charge / discharge cycle performance of the battery is improved.

本発明の一実施形態に係る電極体ユニットが使用される角形電池を模式的に示す断面図である。It is sectional drawing which shows typically the square battery in which the electrode body unit which concerns on one Embodiment of this invention is used. 図１の角形電池に使用される電極体の例を示斜視図である。It is a perspective view which shows the example of the electrode body used for the square battery of FIG. 図１の角形電池に使用される絶縁性部材を示す平面図である。It is a top view which shows the insulating member used for the square battery of FIG. 図１の角形電池に使用される電極体ユニットを示斜視図である。It is a perspective view which shows the electrode body unit used for the square battery of FIG.

以下、本発明に係る実施形態を図面に従って説明するが、本発明はこの実施形態に限定されるものではない。   Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

図１に、本発明の一実施形態に係る電極体ユニット１が用いられる角形電池３の概略構成を示す。この角形電池３では、外装体である直方体形状の外側ケース５に、電極体ユニット１および電解液が収容されている。なお、本実施形態では、角形電池３を、リチウムイオン二次電池として構成している。   FIG. 1 shows a schematic configuration of a prismatic battery 3 in which an electrode body unit 1 according to an embodiment of the present invention is used. In this rectangular battery 3, an electrode body unit 1 and an electrolytic solution are accommodated in a rectangular parallelepiped outer case 5 which is an exterior body. In the present embodiment, the rectangular battery 3 is configured as a lithium ion secondary battery.

電極体ユニット１は、セパレータ７を介して互いに対向する正極体１１および負極体１３を有するほぼ直方体形状の電極体１５と、電極体１５のほぼ全面を覆う、絶縁性部材からなる直方体形状の保護ケース１７とを備えている。   The electrode body unit 1 includes a substantially rectangular parallelepiped electrode body 15 having a positive electrode body 11 and a negative electrode body 13 facing each other with a separator 7 therebetween, and a rectangular parallelepiped protection made of an insulating member covering almost the entire surface of the electrode body 15. Case 17 is provided.

電極体１５は、図２（ａ）に示すように、複数のシート状の正極体１１と負極体１３とをセパレータ７を介して交互に積層させて構成したものであってもよく、同図（ｂ）に示すように、帯状の正極体１１と負極体１３とをセパレータ７を介して対向させて巻き取った後に、扁平状にプレスして形成したものであってもよい。いずれの場合も、電極体１５は、正極体１１と負極体１３との対向方向Ｘに直交する平坦面１５ａを有するように形成されている。本実施形態では、図２（ａ）に示す積層型の電極体１５を用いている。   The electrode body 15 may be configured by alternately laminating a plurality of sheet-like positive electrode bodies 11 and negative electrode bodies 13 via separators 7 as shown in FIG. As shown in (b), the belt-shaped positive electrode body 11 and the negative electrode body 13 may be wound with the separator 7 facing each other and then pressed into a flat shape. In any case, the electrode body 15 is formed so as to have a flat surface 15 a orthogonal to the facing direction X between the positive electrode body 11 and the negative electrode body 13. In the present embodiment, the stacked electrode body 15 shown in FIG. 2A is used.

図３に示すように、保護ケース１７は、平板状の絶縁性部材１９を折り曲げ加工することにより形成されており、図１に示すように、保護ケース１７が完成し、電極体１５を覆っている状態において、保護ケース１７の絶縁性部材１９の重畳部分１９ａによって電極体１５の平坦面１５ａが覆われないように設定されている。本実施形態では、重畳部分１９ａは積層型電極体１５の、積層方向（対向方向）Ｘに平行な側面１５ｂを覆っている。   As shown in FIG. 3, the protective case 17 is formed by bending a flat insulating member 19. As shown in FIG. 1, the protective case 17 is completed and covers the electrode body 15. In this state, the flat surface 15a of the electrode body 15 is set so as not to be covered by the overlapping portion 19a of the insulating member 19 of the protective case 17. In the present embodiment, the overlapping portion 19 a covers the side surface 15 b of the stacked electrode body 15 parallel to the stacking direction (opposing direction) X.

また、本実施形態では、図４に示すように、電極体１５を形成する各正極体１１および負極体１３に、正極集電タブ１１ａ、負極集電タブ１３ａが電極体１５の同一の側面から突出するように設けられており、保護ケース１７には、これら集電タブ１１ａ，１３ａに対応する集電用開口１７ａ，１７ａが設けられている。なお、集電用開口１７ａの数および位置は、電極体１５の仕様に応じて適宜選択してよい。   In the present embodiment, as shown in FIG. 4, the positive electrode current collecting tab 11 a and the negative electrode current collecting tab 13 a are formed on the same side surface of the electrode body 15. The protective case 17 is provided with current collecting openings 17a and 17a corresponding to the current collecting tabs 11a and 13a. The number and position of the current collecting openings 17a may be appropriately selected according to the specifications of the electrode body 15.

さらに、保護ケース１７には、電解液を保護ケース１７の内方に導入するための導入孔２１が設けられていることが好ましい。これにより、予め保護ケース１７に電解液を注入しておく必要がなく、従来と同様に図１の外側ケース５を介して注液することにより角形電池３を作製することができるので、追加の設備が不要となる。導入孔２１は、特には、保護ケース１７の側面のいずれかに設けることが好ましい。   Further, the protective case 17 is preferably provided with an introduction hole 21 for introducing the electrolyte into the protective case 17. Thereby, it is not necessary to inject the electrolytic solution into the protective case 17 in advance, and the rectangular battery 3 can be manufactured by injecting the liquid through the outer case 5 of FIG. Equipment is not required. The introduction hole 21 is particularly preferably provided on one of the side surfaces of the protective case 17.

このように、保護ケース１７には、電池３の仕様や製造上の便宜を考慮して、孔や開口が適宜設けられていてよいが、保護ケース１７の機械的強度を確保し、より確実に電極体１５を保護する観点から、このような孔や開口は必要最小限度の範囲で設けることが好ましい。具体的には、電極体１５本体（つまり、セパレータ７、正極体１１および負極体１３のみからなる、集電タブを含まない部分）に外接する仮想の直方体の表面積に対して、９０％以上が保護ケース１７によって覆われていることが好ましく、９５％以上が覆われていることがより好ましい。   As described above, the protective case 17 may be appropriately provided with a hole or an opening in consideration of the specifications of the battery 3 or manufacturing convenience. However, the mechanical strength of the protective case 17 is ensured and more reliably. From the viewpoint of protecting the electrode body 15, it is preferable to provide such holes and openings within a necessary minimum range. Specifically, 90% or more of the surface area of the virtual rectangular parallelepiped circumscribing the electrode body 15 main body (that is, the portion including only the separator 7, the positive electrode body 11, and the negative electrode body 13 and not including the current collecting tab) is 90% or more. It is preferable that it is covered with the protective case 17, and it is more preferable that 95% or more is covered.

なお、ここで、電極体１５を保護ケース１７が「覆っている」面積には、仮に保護ケース１７の絶縁性部材１９に孔や開口が設けられていたとしても、保護ケース１７の機械的保護機能が損なわれない程度の小さい孔や開口である場合には、そのような孔や開口が形成されている部分の面積も含める。具体的には、後述する腰強度および突き刺し強度に実質的に影響を与えず、かつ製造工程において人間または一般的な製造用装置が保護ケース１７上から電極体ユニット１に触れても、内部の電極体１５に接触することがない程度の大きさの孔、開口であれば、保護ケース１７の機械的保護機能は損なわれない。例えば、保護ケース１７の肉厚の５００％以下の直径の孔または開口が、これに該当する。   Here, even if a hole or an opening is provided in the insulating member 19 of the protective case 17 in the area where the protective case 17 covers the electrode body 15, the mechanical protection of the protective case 17 is performed. In the case of a hole or opening that is small enough not to impair the function, the area of the part where such a hole or opening is formed is also included. Specifically, even if a human or a general manufacturing apparatus touches the electrode body unit 1 from above the protective case 17 in the manufacturing process without substantially affecting the waist strength and piercing strength described later, The mechanical protection function of the protective case 17 is not impaired as long as the hole and the opening have a size that does not contact the electrode body 15. For example, a hole or opening having a diameter of 500% or less of the thickness of the protective case 17 corresponds to this.

絶縁性部材１９を形成する材料としては、絶縁性および一定の機械的強度を有し、かつ耐電解液性を有するものであれば特に限定されないが、１ＧＰａ以上の腰強度および１０Ｎ以上の突き刺し強度を有する樹脂が好ましく用いられる。ここで、腰強度とは、剛性率Ｇ＝Ｅ／［２×（１＋γ）］（Ｅはヤング率，γはポアソン率を示す。）によって表される値である。腰強度のより好ましい範囲は３〜５ＧＰａである。また、突き刺し強度のより好ましい範囲は２０Ｎ以上である。このように構成することにより、電極体１５をより確実に機械的に保護することができる。   The material for forming the insulating member 19 is not particularly limited as long as it has an insulating property, a certain mechanical strength, and has an electrolytic solution resistance, but a waist strength of 1 GPa or more and a puncture strength of 10 N or more. A resin having is preferably used. Here, the waist strength is a value represented by a rigidity modulus G = E / [2 × (1 + γ)] (E is Young's modulus and γ is Poisson's modulus). A more preferable range of waist strength is 3 to 5 GPa. Moreover, the more preferable range of piercing strength is 20 N or more. By comprising in this way, the electrode body 15 can be protected more reliably mechanically.

また、絶縁性部材１９は、透明または半透明な素材で形成されていることが好ましい。これにより、Ｘ線透過装置のような検査設備を要せず、目視によって保護ケース１７に挿入された電極体１５の位置ずれなどの不具合を検査することができる。絶縁性素材１９の透明度としては、可視光の透過度が７０％以上であることが特に好ましい。以上で述べた観点から、本実施形態では、絶縁性部材１９を形成する材料としてポリプロピレンを用いている。   The insulating member 19 is preferably formed of a transparent or translucent material. This eliminates the need for an inspection facility such as an X-ray transmission device, and can inspect defects such as positional displacement of the electrode body 15 inserted into the protective case 17 by visual observation. As the transparency of the insulating material 19, it is particularly preferable that the visible light transmittance is 70% or more. From the viewpoint described above, in this embodiment, polypropylene is used as a material for forming the insulating member 19.

さらに、保護ケース１７の外表面には、潤滑処理が施されていることが好ましい。この潤滑処理は、保護ケース１７が図１の外側ケース５に挿入される際の保護ケース１７の外表面と外側ケース５の内表面との摩擦を低減するものであれば特に限定されないが、例えば、グリスのような潤滑剤を塗布することができる。   Furthermore, it is preferable that the outer surface of the protective case 17 is lubricated. This lubrication treatment is not particularly limited as long as it reduces friction between the outer surface of the protective case 17 and the inner surface of the outer case 5 when the protective case 17 is inserted into the outer case 5 of FIG. A lubricant such as grease can be applied.

上記で説明した第１実施形態に係る電極体ユニット１によれば、電極体１５が保護ケース１７によって覆われているので、粘着テープを用いることなく電極体１５を固定し、かつ機械的に保護することができる。これにより、粘着テープの重畳部分を考慮した大きな寸法公差を設定する必要がないので、電池３のエネルギー密度が増大する。また、正極体１１と負極体１３の対向方向Ｘに保護ケース１７の重畳部分１９ａが存在しないので、電極体１５の緊迫度、つまり正極体１１と負極体１３との接触圧が均一となるので、電池３の長期充放電サイクル性能が向上する。さらには、電極体１５が、平滑な表面を有する保護ケース１７で覆われることにより、角形電池３の外側ケース５への挿入作業が確実かつ容易となり、電池３の製造コストが低減される。   According to the electrode body unit 1 according to the first embodiment described above, since the electrode body 15 is covered with the protective case 17, the electrode body 15 is fixed and mechanically protected without using an adhesive tape. can do. Thereby, since it is not necessary to set a large dimensional tolerance in consideration of the overlapping portion of the adhesive tape, the energy density of the battery 3 increases. In addition, since the overlapping portion 19a of the protective case 17 does not exist in the facing direction X of the positive electrode body 11 and the negative electrode body 13, the degree of tightness of the electrode body 15, that is, the contact pressure between the positive electrode body 11 and the negative electrode body 13 becomes uniform. The long-term charge / discharge cycle performance of the battery 3 is improved. Furthermore, since the electrode body 15 is covered with the protective case 17 having a smooth surface, the operation of inserting the prismatic battery 3 into the outer case 5 becomes reliable and easy, and the manufacturing cost of the battery 3 is reduced.

以下の実施例により、本発明をさらに具体的に説明するが、本発明はこれらに限定されるものではない。   The following examples further illustrate the present invention, but the present invention is not limited thereto.

（実施例電池の作製）
１０Ａｈの電池容量を有する下記の仕様の角形のリチウムイオン二次電池を作製し、実施例電池とした。
電池サイズ：幅１１５ｍｍ×高さ１６０ｍｍ（端子突起部除く）×厚み１５ｍｍ
外装体（外側ケース）：アルミニウム合金缶（側面缶肉厚０．７ｍｍ，内寸厚み１３．６０ｍｍ）
正極体：活物質 ＬｉＭｎ２Ｏ４系合剤／芯体：アルミニウム箔（厚み１５μｍ）／電極厚み：１１５μｍ／電極サイズ：１４８ｍｍ×９８ｍｍ（集電タブ除く）
負極体：活物質 黒鉛系合剤
セパレータ：ポリプロピレン微多孔膜（１５μｍ厚）
電極体構成：正極体４５層／負極体４６層
保護ケース素材：２軸延伸処理ポリプロピレン（厚み１５０μｍ，腰強度２．３ＧＰａ，突き刺し強度１４．７Ｎ） (Production of Example Battery)
A prismatic lithium ion secondary battery having a battery capacity of 10 Ah and having the following specifications was fabricated and used as an example battery.
Battery size: width 115mm x height 160mm (excluding terminal protrusions) x thickness 15mm
Exterior body (outer case): Aluminum alloy can (side can thickness 0.7 mm, inner dimension thickness 13.60 mm)
Positive electrode body: active material LiMn 2 O 4 system mixture / core body: aluminum foil (thickness 15 μm) / electrode thickness: 115 μm / electrode size: 148 mm × 98 mm (excluding current collecting tab)
Negative electrode: Active material Graphite-based mixture Separator: Polypropylene microporous membrane (15 μm thickness)
Electrode body configuration: 45 positive electrode bodies / 46 negative electrode bodies Protective case material: Biaxially stretched polypropylene (thickness 150 μm, waist strength 2.3 GPa, puncture strength 14.7 N)

上記の仕様の角形電池を、以下の手順で作製した。   A prismatic battery having the above specifications was produced by the following procedure.

（１）積層工程
保護ケース（絶縁性部材）を、電極体の平坦面を覆う面が底部となるように配置し、他の隣接する２面（側面を形成する面）を立ち上げて半容器状に設置して、立ち上がった互いに対向する２面で位置決めしながら負極体と正極体とを交互に積層した。正極体および負極体を所定枚数積層した後、絶縁性部材の残りの部分を折り曲げて保護ケースを組み立てた。この際、絶縁性部材の、電極体の平坦面を覆う面を除く側面４面において絶縁性部材を重ねて接着することにより、保護ケースを完成させた。保護ケースを含む電極体ユニットの無負荷状体での厚みは１３．６７ｍｍ，電極体の対向方向に１Ｎの圧力を加えた状態での厚みは１３．１４ｍｍであった。なお、これに追加した絶縁対策工程は不要である。 (1) Laminating step A protective case (insulating member) is arranged so that the surface covering the flat surface of the electrode body is the bottom, and the other two adjacent surfaces (surfaces forming the side surfaces) are raised to form a half container The negative electrode body and the positive electrode body were alternately laminated while being positioned on two surfaces facing each other. After a predetermined number of positive and negative electrode bodies were laminated, the remaining part of the insulating member was folded to assemble a protective case. At this time, the protective member was completed by overlapping and bonding the insulating member on the four side surfaces of the insulating member excluding the surface covering the flat surface of the electrode body. The thickness of the unloaded body of the electrode body unit including the protective case was 13.67 mm, and the thickness when 1 N pressure was applied in the opposing direction of the electrode body was 13.14 mm. In addition, an additional insulation countermeasure process is unnecessary.

（２）電池組立工程
集電タブ同士を接続した後、電極体ユニットを外装体に挿入した。その後、外装体に電解液を注液し、レーザー溶接で外装体の本体と蓋とを接合・封止した。 (2) Battery assembly process After connecting current collection tabs, the electrode body unit was inserted in the exterior body. Then, electrolyte solution was poured into the exterior body, and the main body and lid of the exterior body were joined and sealed by laser welding.

（比較例電池の作製）
上記実施例電池において、電極体の巻留めおよび絶縁用として、保護ケースの代わりに粘着テープ（ポリプロピレン製／幅：３０ｍｍ，厚み：本体２５μｍ＋糊５μｍ）を用いた仕様のものを以下の手順で作製し、比較例電池とした。 (Production of comparative battery)
In the battery of the above example, a battery having a specification using an adhesive tape (made of polypropylene / width: 30 mm, thickness: main body 25 μm + glue 5 μm) instead of the protective case for winding and insulation of the electrode body is produced by the following procedure. And it was set as the comparative example battery.

（１）積層工程
位置決め治具上に負極体および正極体を交互に所定枚数積層した。この積層体の中央部を粘着テープで帯巻きすることにより、電極の積層体を作製した。電極積層体の無負荷状体での厚みは最大部分で１４．８７ｍｍ，電極積層体の対向方向に１Ｎの圧力を加えた状態での厚みは１２．９２ｍｍであった。この電極積層体を、その端部にダメージを与えないように注意を払いながら搬送治具に挿入し、次工程へ移動した。 (1) Lamination process A predetermined number of negative and positive electrode bodies were alternately laminated on a positioning jig. The laminated body of the electrode was produced by banding the center part of this laminated body with an adhesive tape. The maximum thickness of the electrode laminate in the unloaded state was 14.87 mm, and the thickness in the state where 1 N pressure was applied in the opposing direction of the electrode laminate was 12.92 mm. This electrode laminate was inserted into a conveying jig while paying attention so as not to damage the end portion, and moved to the next step.

（２）絶縁対策工程
電極積層体のコーナー部および側面部に、絶縁および内部短絡防止のための粘着テープを貼付した。また、集電タブの取り出し面には、ポリプロピレンの成型体（厚み０．５ｍｍ）で形成された絶縁板を取り付け、集電タブおよび外装体の蓋部との絶縁を図った。この時点で、電極積層体の無負荷状体での厚みは最大部分で１４．０６ｍｍ，電極積層体の対向方向に１Ｎの圧力を加えた状態での厚みは１２．９８ｍｍであった。 (2) Insulation countermeasure process Adhesive tape for insulation and prevention of internal short-circuiting was affixed to the corner part and side part of the electrode laminate. In addition, an insulating plate formed of a polypropylene molded body (thickness 0.5 mm) was attached to the take-out surface of the current collecting tab so as to insulate the current collecting tab and the lid portion of the exterior body. At this time, the maximum thickness of the electrode laminate in the unloaded state was 14.06 mm, and the thickness in a state where 1 N pressure was applied in the opposing direction of the electrode laminate was 12.98 mm.

（３）電池組立工程
その後、実施例電池の場合と同様にして電池組立工程を行ったが、この比較例電池の電池組立工程においては、電極積層体にダメージを与えないよう、細心の注意を要した。 (3) Battery assembly process Thereafter, the battery assembly process was carried out in the same manner as in the case of the battery of the example. However, in the battery assembly process of this comparative example battery, great care was taken not to damage the electrode stack. It cost.

（試験結果）
上記の実施例電池および比較例電池について、機械的強度を確認するための試験（球状押し潰し試験，コーナー部圧壊試験）と、高負荷での充放電サイクル試験とを行った。 (Test results)
With respect to the above-described example batteries and comparative example batteries, tests for confirming mechanical strength (spherical crushing test, corner crushing test) and a charge / discharge cycle test under high load were performed.

（１）機械的強度確認試験結果
球状押し潰し試験として、ｒ＝５ｍｍの球状先端を有する棒で電池を押し潰し、内部短絡が発生した時点での押し潰し深さを測定したところ、サンプル数＝５の平均値で、比較例電池では２．８３ｍｍであったのに対し、実施例電池では３．１７ｍｍであった。また、コーナー部圧壊試験として、φ１０ｍｍの丸棒で電池のコーナー部（稜）の頂点から圧壊し、内部短絡が発生した時点での圧力を測定したところ、サンプル数＝５の平均値で、比較例電池では、側面稜：２４．５ｋｇｆ／底面稜：２９．６ｋｇｆであったのに対し、実施例電池では、側面稜：３０．４ｋｇｆ／底面稜：３１．５ｋｇｆであった。これらの結果により、比較例電池でも十分な強度を有しているものの、実施例電池では機械的強度がさらに向上していることが確認された。 (1) Mechanical strength confirmation test results As a spherical crushing test, the battery was crushed with a rod having a spherical tip of r = 5 mm, and the crushing depth when an internal short circuit occurred was measured. The average value of 5 was 2.83 mm in the comparative battery, and 3.17 mm in the battery of the example. Also, as a corner crushing test, the pressure at the time when the internal short circuit occurred after crushing from the apex of the corner (ridge) of the battery with a round bar of φ10 mm was compared with the average value of the number of samples = 5. In the example battery, the side ridge was 24.5 kgf / bottom ridge: 29.6 kgf, whereas in the example battery, the side ridge was 30.4 kgf / bottom ridge: 31.5 kgf. From these results, it was confirmed that the mechanical strength of the example battery was further improved although the comparative example battery had sufficient strength.

（２）充放電サイクル試験結果
室温において、５０Ａで充放電サイクルを行い、電池容量が初期の８０％に低下するまでのサイクル数を測定したところ、サンプル数＝５の平均値で、比較例電池では７２８サイクルであったのに対し、実施例電池では９８３サイクルであった。実施例電池では、比較例電池よりも正極体と負極体との接触圧の均一化が図れているため、充放電反応が電極内で均一的に進行し、充放電サイクル特性が向上したものと考えられる。 (2) Results of charge / discharge cycle test At room temperature, a charge / discharge cycle was performed at 50 A, and the number of cycles until the battery capacity decreased to 80% of the initial value was measured. Was 728 cycles, whereas in the example battery, it was 983 cycles. In the example battery, the contact pressure between the positive electrode body and the negative electrode body is made more uniform than in the comparative battery, so that the charge / discharge reaction proceeds uniformly in the electrode and the charge / discharge cycle characteristics are improved. Conceivable.

以上のとおり、図面を参照しながら本発明の好適な実施形態を説明したが、本発明の趣旨を逸脱しない範囲内で、種々の追加、変更または削除が可能である。したがって、そのようなものも本発明の範囲内に含まれる。   As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

１ 電極体ユニット
３ 角形電池
５ 外側ケース
７ セパレータ
１１ 正極体
１３ 負極体
１５ 電極体
１５ａ 電極体の平坦な表面
１７ 保護ケース
１９ 絶縁性部材
１９ａ 重畳部分
Ｘ 対向方向 DESCRIPTION OF SYMBOLS 1 Electrode body unit 3 Square battery 5 Outer case 7 Separator 11 Positive electrode body 13 Negative electrode body 15 Electrode body 15a Flat surface 17 of electrode body Protective case 19 Insulating member 19a Overlapping part X Opposite direction

Claims (7)

角形電池に用いられる電極体ユニットであって、
セパレータを介して交互に積層した複数のシート状の正極体および負極体からなるほぼ直方体形状の電極体であって、前記正極体と負極体との対向方向に直交する平坦な表面を有する電極体と、
平板状の絶縁性部材を加工して形成された、前記電極体の六面を覆う直方体形状の保護ケースと、
を備えており、
前記保護ケースの前記絶縁性部材の重畳部分が、前記電極体の前記平坦な表面を覆わないように設定されている、
角形電池用電極体ユニット。 An electrode body unit used for a prismatic battery,
An electrode body having a substantially rectangular parallelepiped shape composed of a plurality of sheet-like positive electrode bodies and negative electrode bodies alternately laminated via separators, and having a flat surface perpendicular to the facing direction of the positive electrode body and the negative electrode body When,
A rectangular parallelepiped protective case covering the six surfaces of the electrode body, formed by processing a flat insulating member,
With
The overlapping part of the insulating member of the protective case is set so as not to cover the flat surface of the electrode body,
Square battery electrode body unit. 請求項１において、前記保護ケースに、この保護ケースの内方に電解液を導入する導入孔が設けられている角形電池用電極体ユニット。   2. The rectangular battery electrode body unit according to claim 1, wherein the protective case is provided with an introduction hole for introducing an electrolyte into the protective case. 請求項１または２において、前記平板状の絶縁性部材が、１ＧＰａ以上の腰強度および１０Ｎ以上の突き刺し強度を有する樹脂によって形成されている角形電池用電極体ユニット。 According to claim 1 or 2, wherein the plate-shaped insulating member is prismatic battery electrode body unit being formed by a resin having a waist strength and 10N or more piercing strength of at least 1 GPa. 請求項１から３のいずれか一項において、前記平板状の絶縁性部材が透明または半透明な素材によって形成されている角形電池用電極体ユニット。 In any one of claims 1 3, wherein the plate-shaped insulating member is formed by a transparent or semi-transparent material prismatic battery electrode body unit. 請求項１から４のいずれか一項において、前記保護ケースの外表面に潤滑処理が施されている角形電池用電極体ユニット。   5. The rectangular battery electrode unit according to claim 1, wherein the outer surface of the protective case is lubricated. 6. 請求項１から５のいずれか一項において、前記正極体の正極集電タブおよび前記負極体の負極集電タブが、前記電極体の同一の側面から突出するように設けられており、前記保護ケースにおける前記電極体の前記正極タブおよび負極タブが設けられた側面を覆う側面に、各集電タブに対応する２つの集電用開口が形成されている角形電池用電極体ユニット。 The positive electrode current collector tab of the positive electrode body and the negative electrode current collector tab of the negative electrode body are provided so as to protrude from the same side surface of the electrode body according to any one of claims 1 to 5, and the protection An electrode unit for a rectangular battery, wherein two current collection openings corresponding to each current collection tab are formed on a side surface of the case that covers the side surface of the electrode body on which the positive electrode tab and the negative electrode tab are provided. 請求項１から６のいずれか一項に記載の電極体ユニットと、この電極体ユニットおよび電解液を収容する、該角形電池の外装体を形成する直方体形状の外側ケースとを備える角形電池。   A prismatic battery comprising: the electrode body unit according to any one of claims 1 to 6; and a rectangular parallelepiped outer case that houses the electrode body unit and an electrolyte solution and forms an exterior body of the prismatic battery.
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