| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack which includes a magnesium ion secondary battery capable of charging/discharging regardless the type of an electrolyte and improved in cycle characteristic and charge/discharge efficiency.SOLUTION: A battery pack includes a housing case, a magnesium ion secondary battery including a positive electrode terminal and a negative electrode terminal, and a protection circuit including an over-charge protection function and an over-discharge protection function, and the magnesium ion secondary battery and the protection circuit are stored in the housing case. The magnesium ion secondary battery includes a positive electrode plate, a negative electrode plate and an electrolyte, and the negative electrode plate includes a material for the negative electrode plate of the magnesium ion secondary battery. The material for the negative electrode plate of the magnesium ion secondary battery includes magnesium metal and an allotrope of carbon, and the magnesium metal and the allotrope of carbon are in contact with each other in part. |
