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Corporate Info
| December 1996 | Panasonic EV Energy Co., Ltd is established. |
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| January 1997 |
Start development and mass production of EV-95 NiMH batteries for electric cars.
Start development and mass production of battery ECUs and detection units. 
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| December 1997 | Develop the cylindrical NiMH battery pack. |
| May 2000 | Develop and start mass production of prismatic NiMH battery (resin case) for hybrid vehicles (NP1.0). Develop and start mass production of battery ECU for hybrid vehicles. |
| July 2003 |
Develop and start mass production of the improved prismatic NiMH battery (resin case) for hybrid vehicles (NP2.0).
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| February 2005 |
Develop and start mass production of the metal case prismatic NiMH battery for hybrid cars (NP2.5).
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| November 2006 | The number of accumulated production units exceeds 1 million units (on the basis of the number of cars). |
| February 2008 | Both the Office and Engineering Building of Omori Plant is completed. The head office is relocated. |
| December 2008 | The number of accumulated production units exceeds 2 million units (on the basis of the number of cars). |
| September 2009 |
Start mass production of prismatic lithium-ion battery for hybrid vehicles (Li1.0).
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| January 2010 | Start production at Miyagi Plant. |
| June 2010 | Change the corporate name to Primearth EV Energy Co., Ltd. The number of accumulated production units exceeds 3 million units (on the basis of the number of cars). |
| January 2011 | Start full-scale mass production of prismatic lithium-ion battery for hybrid vehicles. |
| November 2011 | The number of accumulated production units exceeds 4 million units (on the basis of the number of cars). |
| September 2012 | The number of accumulated production units exceeds 5 million units (on the basis of the number of cars). |
| July 2013 | The number of accumulated production units exceeds 6 million units (on the basis of the number of cars). |
| November 2013 | Establish SYNOGY TOYOTA AUTMOTIVE ENERGY SYSTEM CO., LTD. (STAES) in Changshu New & Hi-tech Industrial Development Zone,Jiangsu, China. |
| December 2013 | The number of accumulated production units exceeds 1 million units (on the basis of the number of cars) at Miyagi Plant. |
| June 2014 | The number of accumulated production units exceeds 7 million units (on the basis of the number of cars). |
| August 2014 | Establish SYNOGY TOYOTA AUTMOTIVE ENERGY SYSTEM CO., LTD. (STAES) in Changshu New & Hi-tech Industrial Development Zone,Jiangsu, China. |
| December 2014 | Close Teiho Plant in Toyota, Aichi Prefecture. |
| March 2015 | The number of accumulated production units exceeds 8 million units (on the basis of the number of cars). |
| April 2015 | Miyagi Plant Building #2 starts production of NiMH batteries at Miyagi Plant. |
| July 2015 |
Start mass production of next-generation prismatic lithium-ion battery for hybrid vehicles (Li2.0).
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| October 2015 | Miyagi Plant Building #3 starts production of NiMH batteries at Miyagi Plant. |
| February 2016 | The number of accumulated production units exceeds 9 million units (on the basis of the number of cars). |
| March 2016 | Participate in "Battery Japan"(the 8th International Rechargeable Battery EXPO) for the first time and put up a display booth. |
| May 2016 | Participate in "Automotive Engineering Exposition Yokohama" for the first time and put up a display booth. |