Development of a technique for improving the heat resistance of the lithium ion battery.

Respectively , Nippon Kodoshi and Daikin Industries developed a technique for increasing the heat resistance of the lithium ion battery for use in electric vehicles . In order to be able to lighten the body power consumption and at the same time reduce device cool the battery is no longer needed , extensible 3-4 % of the distance which can run on a single charge . It is effective to prevent accidents as well as ignition of the battery , increase the safety .
Heat is generated in the chemical change at the time of power generation lithium-ion battery . There is a risk that may result in degraded performance and not more than 45 degrees Celsius , to catch fire , the current battery have gained a cooling device on the electric vehicle . To move to full cooling system , distance can run on a single charge is shorter 30% of the time , such as summer temperature is high.
From becoming close to 60 degrees , the automaker is set to immediate goal of the heat resistance of 60 degrees or more battery and there is no cooling system . To achieve this , it is necessary to increase heat resistance in each electrolyte solution of the main component , electrodes , separator ( insulating material ) .
Daikin has developed an electrode and an electrolyte solution with high heat resistance in collaboration with Kansai University . You can now verify that it is replaced with a fluorine flame-retardant components for the electrolyte solution that is easy to ignite , it works just fine at 60 degrees . A laborer , such as changing the type of high heat resistance adhesives solidify the metal material , I improved so as not until the liquid adhesive is also very hot electrode .
I was shipped to battery manufacturers and car companies a prototype for the first electrolyte . The plans in the future and have them evaluated are also prototype of the electrode . I aim to commercialize around 2020 .
Japan advanced paper increased the heat resistance combined with National Institute of Advanced Industrial Science and Technology , of the separator and electrode . The separator is made ​​by processing the extra-fine fibers of the plant , performance fell hard without shrinking even at high temperatures unlike the resin film made ​​of current . Was changed to type high heat resistant adhesive that is used for the electrode . Practical application of five years is the goal both , I started test shipment .
Increasing the heat resistance of the battery , it is possible to omit some functions of the safety device to prevent ignition . It is possible to lighten the body , which leads to a reduction in production cost . It is not said to be in 2020 , I want you to establish a technique for improving the heat resistance so that you can put to practical use as soon as possible.


ダイキン工業やニッポン高度紙工業はそれぞれ、電気自動車に使うリチウムイオン電池の耐熱性を高める技術を開発した。電池を冷やす装置が不要になって電力消費が減ると同時に車体を軽くできるため、１回の充電で走れる距離を３～４割伸ばせる。電池の発火事故なども防げ、安全性を高める効果がある。
　リチウムイオン電池は発電時の化学変化で熱が生じる。現行の電池はセ氏45度以下でないと性能が低下したり、発火したりするおそれがあり、電気自動車に冷却装置を積んでいる。夏場など気温が高い時期は冷却装置をフルに動かすため、１回の充電で走れる距離が３割ほど短くなる。
　冷却装置がないと電池は60度近くになることから、自動車メーカーは60度以上を耐熱性の当面の目標に設定している。これを達成するには、主要部品の電解液、電極、セパレーター（絶縁材）のそれぞれで耐熱性を高める必要がある。
　ダイキンは関西大学と共同で耐熱性の高い電解液と電極を開発した。発火しやすい電解液については成分を燃えにくいフッ素に置き換え、60度でも問題なく動作することを確かめた。電極は金属材料を固める接着剤を耐熱性の高い種類に変えるなどの工夫で、高温になっても接着剤が溶け出さないように改良した。
　まず電解液について試作品を自動車会社や電池メーカーに出荷した。今後、電極の試作品も併せて評価してもらう予定だ。2020年ごろの実用化を目指す。
　ニッポン高度紙は産業技術総合研究所と組み、電極とセパレーターの耐熱性を高めた。植物の繊維を極細に加工して作ったセパレーターは、現行の樹脂フィルム製と違って高温でも縮まず性能が落ちにくい。電極に使う接着剤を耐熱性の高い種類に変えた。いずれも５年後の実用化が目標で、試験出荷を始めた。
　電池の耐熱性を高めると、発火を防ぐ安全装置の機能を一部省くことができる。車体を軽くするとともに、製造コストの低減にもつながる。２０２０年と言わず、早期に実用化できるように耐熱性を高める技術を確立してほしいですね。