Panasonic lithium primary battery carried by the asteroid probe Hayabusa2

OSAKA, Japan–(BUSINESS WIRE)–Panasonic’s lithium primary battery has been installed on the asteroid probe “Hayabusa2″* launched on December 3, 2014. Three models of BR series** cylindrica l lithium primary batteries (BR-A). This time, BR-1/2AA and BR-C, which have a longer shelf life, are installed.

Previously, the same type of battery was installed on the Hayabusa that returned to Earth in 2010. This time, these batteries will be used to support the Hayabusa2 mission, which requires a round trip of 5,240,000,000 kilometers in 6 years while serving as a power source for four instruments: a beacon signal transmitter for collecting the “reentry module” , a capsule that stores particle samples from asteroids and brings them back to Earth; an impactor used to create artificial craters (depressions) to retrieve underground material from asteroids, used to photograph artificial craters formed by impactors Deployable cameras, as well as flight data measurement instruments for the return capsule to return to the atmosphere.


Hayabusa2 is the successor of Hayabusa, which successfully explored the Itokawa asteroid (S-type asteroid) and collected particle samples. The mission of Hayabusa2 is to explore a C-type asteroid that is believed to contain organic matter and water, and to bring particle samples back to Earth. By installing an “impactor” to create artificial craters, it will attempt to collect samples of subsurface particles from the asteroid in addition to samples taken from the asteroid’s surface.


On board Hayabusa, Panasonic’s BR series cylindrical lithium primary batteriestheir performance after long-term space flight more than seven years after launch and were used to transmit beacon signals to indicate Hayabusa’s re-entry landing. The location will thus facilitate rapid recovery of the capsule after its return to Earth in June 2010. BR series lithium primary battery cathode uses fluorinated graphite. In addition to safety, it also has a long storage life and has broad application prospects. operating temperature range and low self-discharge rate. Their high reliability helped recover the Hayabusa capsule in the Australian desert, allowing them to take on an expanded role on Hayabusa 2 and will make a significant contribution to the mission’s execution.
*: The mission of “Hayabusa2” is to explore the materials that promote planet formation and their growth processes to reveal the origin and evolution of the solar system, the Earth, and life itself.

The purpose of this time is to observe the landform, internal structure, gravity and other chemical substances of the asteroid 1999 JU3 (C-type asteroid), and to bring back material samples. It is believed that the asteroid contains water and organic matter. materials in their mineral composition. Hayabusa2 was launched on December 3, 2014. It will arrive at the asteroid around the beginning of summer 2018, leave around the end of 2019, and return to Earth around the end of 2020.


**: BR series lithium primary batteries are primary batteries that use fluorinated graphite for the positive electrode and lithium for the negative electrode. With a high nominal voltage of 3V, they offer the advantages of long shelf life, wide operating temperature range (-40°C to 85°C) and reliability. They can also be used as main power sources for various instruments such as 10-year maintenance-free gas meters, as memory backup power sources, and as main power sources in vehicle equipment such as ETC and keyless entry.

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