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A magnesium cell includes a positive electrode, a negative electrode including a magnesium alloy, and a separator disposed between the positive electrode and the negative electrode to hold an electrolytic solution, in which a contact area between the negative electrode and the separator is variable.

A magnesium cell includes a positive electrode, a negative electrode including a magnesium alloy, and a separator disposed between the positive electrode and the negative electrode to hold an electrolytic solution, in which a contact area between the negative electrode and the separator is variable.

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1. A magnesium cell comprising: a positive electrode;a negative electrode including a magnesium alloy;a separator disposed between the positive electrode and the negative electrode to hold an electrolytic solution; anda contact area varying unit configured to manipulate at least a portion of the sep

1. A magnesium cell comprising: a positive electrode;a negative electrode including a magnesium alloy;a separator disposed between the positive electrode and the negative electrode to hold an electrolytic solution; anda contact area varying unit configured to manipulate at least a portion of the separator such that a contact area between the negative electrode and the separator is varied depending on an operation state of a loading device, the loading device operating by electric power extracted from the positive electrode and the negative electrode. 2. The magnesium cell according to claim 1, wherein the separator is made of a porous material and holds the electrolytic solution therein, andwhen a pressing force is applied to the separator from the positive electrode side to the negative electrode side, the separator deforms elastically, and the contact area between the negative electrode and the separator is variable depending on an amount of the deformation of the separator. 3. The magnesium cell according to claim 1, wherein the separator includes a plurality of separator chambers which are partitioned and provided on a plane along a surface of the negative electrode, andthe contact area between the negative electrode and the separator is variable by selectively supplying the electrolytic solution to the separator chambers to cause the separator chambers to hold the electrolytic solution therein. 4. The magnesium cell according to claim 1, wherein the separator includes a plurality of separator chambers which are partitioned and provided on a plane along a surface of the negative electrode, andthe contact area between the negative electrode and the separator is variable by selectively inserting a partition member between the negative electrode and the separator chambers. 5. The magnesium cell according to claim 1, wherein the separator includes a plurality of separator chambers which are partitioned and provided on a plane along a surface of the negative electrode, andthe contact area between the negative electrode and the separator is variable by selectively moving the separator chambers to a contact position with the negative electrode or a spaced position from the negative electrode. 6. The magnesium cell according to claim 1, wherein the negative electrode includes a fuel member that includes a magnesium alloy and is contactable to the separator, and a negative electrode member that is disposed to be in contact with the fuel member, andthe fuel member is movable between the separator and the negative electrode member while maintaining contact therewith. 7. The magnesium cell according to claim 6, wherein an area in which an unused part of the fuel member contacts the separator is variable by moving the fuel member. 8. A magnesium cell system comprising: a magnesium cell including a positive electrode, a negative electrode having a magnesium alloy, a separator disposed between the positive electrode and the negative electrode to hold an electrolytic solution, and a driving portion for changing a contact area between the negative electrode and the separator by manipulating at least a portion of the separator; anda control portion configured to control the driving portion depending on an operation state of a loading device, the loading device operating by electric power extracted from the positive electrode and the negative electrode; whereinthe control portion controls the driving portion in such a manner that the contact area between the negative electrode and the separator is increased as a load by the loading device is increased. 9. The magnesium cell system according to claim 8, wherein the control portion controls the driving portion depending on an operation mode of the loading device.