METHOD FOR PRODUCING LITHIUM ION BATTERY

• Main Authors: SATO HAJIME, HORIE HIDEAKI, AKAMA HIROSHI, KUSACHI TAKEKI, NISHIGUCHI MASANORI, OSAWA YASUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 22.11.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a method for producing a lithium ion battery, which is superior in productivity.SOLUTION: A method for producing a lithium ion battery comprises a press-sealing step. The press-sealing step includes: disposing a power-storage unit between a positive electrode outer packaging body having a positive electrode-containing portion in at least a part thereof, and a negative electrode outer packaging body having a negative electrode-containing portion in at least a part thereof, provided that in the power-storage unit, a positive electrode composition which is a non-binding material including a positive electrode active material and an electrolyte solution and a negative electrode composition which is a non-binding material including a negative electrode active material and the electrolyte solution are laminated through a separator so that the positive and negative electrode compositions are opposed to each other; and sealing the positive and negative electrode outer packaging bodies together while pressing the positive and negative electrode compositions. A volume (V) of a battery outer casing when the positive and negative electrode outer packaging bodies are sealed with the positive and negative electrode-containing portions containing nothing, a volume (V) of the battery outer casing after the press-sealing step, and a total value (V) of a volume of the positive electrode-containing portion and a volume of the negative electrode-containing portion in a state in which the positive and negative electrode-containing portions contain nothing satisfy the relation given by: 0<(V-V)/(V)×100<70.SELECTED DRAWING: Figure 2 【課題】製造性に優れたリチウムイオン電池の製造方法を提供すること。【解決手段】少なくとも一部に正極収容部を有する正極外装体と、少なくとも一部に負極収容部を有する負極外装体との間に、正極活物質及び電解液を含む非結着体である正極電極組成物と負極活物質及び電解液を含む非結着体である負極電極組成物とがセパレータを介して相対向するように積層された蓄電部を配置し、上記正極電極組成物及び上記負極電極組成物を圧縮しながら、上記正極外装体と上記負極外装体とを封止する圧縮封止工程を備えたリチウムイオン電池の製造方法であって、上記正極収容部及び上記負極収容部に何も収容せずに封止した場合の電池外装体の体積（Ｖ２）、上記圧縮封止工程後の上記電池外装体の体積（Ｖ１）、及び、何も収容しない状態での上記正極収容部の容積と上記負極収容部の容積との合計値（Ｖ３）が、０＜（Ｖ１−Ｖ２）／（Ｖ３）×１００＜７０を満たすことを特徴とするリチウムイオン電池の製造方法。【選択図】 図２