The story
Foundation
Sony Energy Devices Corporation started in February, 1975 as Sony-Eveready a joint venture between Sony Corp and Union Carbide Corp of United States to design and manufacture batteries. In April, 1986 the joint venture dissolved and name changed to Sony Energytec.
Expansion
Between 1977 and 2000 Sony Energytec started production of many primary and secondary battery technologies, such as silver oxide batteries, alkaline-manganese dry batteries and lithium-ion batteries. In 2000 Sony Energytec merged with Sony Motomiya to form Sony Fukushima. In 2006 Sony Fukushima merged with Sony Tochigi to form Sony Energy Devices Corp.
Esstalion Technologies, Inc was established in June, 2014 as a joint venture between Sony and Hydro-Québec.
Timeline
1975 – Sony-Eveready established as joint venture between Sony Corp and Union Carbide Corp.
1977 – Production of silver oxide batteries.
1979 – Production of alkaline-manganese dry battery.
1982 – Production of lithium coin batteries.
1986 – The joint venture dissolved and name changed to Sony Energytec.
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1991 – Production of lithium-ion batteries.
1998 – Started lithium-ion battery electrodes.
1999 – Production of lithium-ion polymer batteries.
2000 – Started power supply unit business.
2000 – Sony Energytec merged with Sony Motomiya to form Sony Fukushima.
2004 – Sony Fukushima merged with Sony Tochigi to form Sony Energy Devices Corp.
2006 – Production of lithium-ion battery pack.
2014 – Establishment of Esstalion Technologies, Inc., a joint venture between Sony and Hydro-Québec.
2016 – Sony Energy Devices agreed to transfer its battery business to Murata.
2017 – Transfer of the battery business to Murata is completed.
From Wikipedia’s article on Sony Energy Devices Corporation, shared under CC BY-SA 4.0.4