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Safety of Battery Cells

Batteries that Meet the Highest Global Safety Standards

First and foremost, ELIIY Power makes safety a top priority in the development of our products.
All large-size lithium-ion electricity storage battery cells included in each of our electricity storage systems are manufactured at our plant in Japan.

Olivine-type lithium iron phosphate, which offers superior safety, is used as a material for cathode. Our lithium-ion electricity storage batteries are the first of their type in the world to have passed international certification organization TÜV Rheinland link icon’s product safety test.

In the event of a loss of function with the battery management unit (BMU), we believe it is most essential to ensure that the battery cells remain safe, and we are therefore developing and manufacturing batteries that meet high safety standards - even if punctured with a needle (internal short-circuit), crushed, or overcharged, there is no risk of thermal runaway and they do not catch fire.

What’s more, they offer an extended lifespan: even if charged and recharged repeatedly for 10 years (approx. 12,000 times), they will retain 80.1%* of their electricity storage capacity.
You may therefore use our products safely over long periods of time. *Estimated value assuming 23ºC room temperature and three full charge and recharge cycles per day (depth of discharge (DOD) = 100%).

Battery Cell

Puncture and crushing test video

TÜV-S MarkSeal of safety and reliability issued by TÜV Rheinland
Passed stringent tests on 11 criteria

Battery Cell Specifications

Battery Cell

Nominal capacity:
Nominal voltage:
W170.5 × D43.5 × H111.9 mm
Energy density:
Operating temperature:
-20 to 60ºC(guaranteed operating temperature: 0 to 45ºC)
Cathode material:
Lithium iron phosphate
Anode material:

  • Extremely safe
  • Lithium iron phosphate used for cathode
  • Stacking method
  • Wide operating temperature range, from cold (-20ºC) to hot (60ºC)
  • High capacity per cell
  • High energy density

What are large-size lithium-ion batteries for electricity storage?

Lithium-ion batteries with a capacity of several Ah, which are commonly used in devices such as laptop computers and cell phones, are known as small-size lithium-ion batteries. Conversely, batteries with a capacity at least 10 times or greater - like ELIIY Power’s batteries - are generally known as large-size lithium-ion batteries.
Large-size lithium-ion batteries have various advantages: for example, few batteries are used when constructing electricity storage systems, and they provide for easier control.

Click here for an overview of products that use the battery cells.