Patent Description:
Lithium-air batteries have been known, in which oxygen in the air is used as a positive electrode active material and lithium is used as a negative electrode active material as described in <CIT>. Further, <CIT> describes a system and a method for collecting, storing and using the oxygen-rich effluent generated when charging a metal-air battery pack. In <CIT> a vehicular battery system is described which includes a vehicular battery system stack including at least one negative electrode including a form of lithium, an oxygen reservoir having a first outlet operably connected to the vehicular battery system stack, a multistage compressor having a first inlet operably connected to the vehicular battery system stack, and a second outlet operably connected to a second inlet of the oxygen reservoir, and a cooling system operably connected to the multistage compressor and configured to provide a coolant to the multistage compressor to cool a compressed fluid within the multistage compressor. Finally, <CIT> describes a lithium-air battery system having a hermetic structure is provided and eliminates the need to be charged with additional oxygen gas. The system includes a lithium-air battery and an oxygen bombe that stores oxygen gas participating in a lithium-oxygen reaction. A first MFC adjusts a flow rate of oxygen gas supplied from the oxygen bombe to lithium-air battery cells. A blower repeatedly supplies oxygen gas flowing from the first MFC into the lithium-air battery cells. A compressor compresses oxygen generated from the lithium-air battery cells and passes through a second MFC, to a high pressure state to charge the oxygen bombe with the compressed oxygen during a charge operation. The second MFC adjusts a flow rate when oxygen gas generated from the lithium-air battery cells is supplied to the compressor during the charge operation. Additionally, an external power source supplies electric power to the compressor to charge the oxygen bombe.

It is desired to provide a battery system capable of efficient utilization of oxygen.

A first aspect of the present invention provides a battery system. The battery system may include a lithium-oxygen battery. The battery system may include an oxygen compressing unit configured to compress oxygen released from the lithium-oxygen battery. The battery system may include a storage unit configured to store oxygen compressed by the oxygen compressing unit. The battery system may include an oxygen supplying unit configured to supply oxygen stored in the storage unit to the lithium-oxygen battery.

The battery system may further include an enclosure case enclosing the lithium-oxygen battery, and the oxygen compressing unit and the oxygen supplying unit may be connected to the enclosure case. The oxygen supplying unit may supply oxygen stored in the storage unit to the enclosure case, and the battery system may further include a blowing fan disposed in the enclosure case and configured to blow oxygen supplied by the oxygen supplying unit toward the lithium-oxygen battery.

The battery system may further include an internal pressure measuring unit configured to measure an internal pressure of the enclosure case; and an internal pressure adjusting unit configured to maintain the internal pressure of the enclosure case within a predetermined range. The internal pressure adjusting unit may cause the oxygen compressing unit to compress oxygen contained in the enclosure case if the internal pressure of the enclosure case is higher than a predetermined threshold, and may cause the oxygen supplying unit to supply oxygen stored in the storage unit to the enclosure case if the internal pressure of the enclosure case is lower than the predetermined threshold. The oxygen supplying unit may be a compressor, and the internal pressure adjusting unit may maintain the internal pressure of the enclosure case by adjusting a rotation rate of the compressor. The internal pressure adjusting unit may maintain the internal pressure of the enclosure case by controlling a valve to adjust an amount of supplying oxygen stored in the storage unit to the enclosure case.

The battery system may further include a temperature measuring unit configured to measure a temperature in the enclosure case; and a temperature adjusting unit configured to maintain the temperature in the enclosure case within a predetermined range. The temperature adjusting unit may adjust the temperature in the enclosure case by heating oxygen supplied from the oxygen supplying unit to the enclosure case. The temperature adjusting unit adjusts the temperature in the enclosure case by heating inside the enclosure case with a heater provided in the enclosure case. The enclosure case may have a heat retaining property. The enclosure case may include a thermal insulation material.

The oxygen compressing unit may be a compressor. The oxygen supplying unit may be the compressor. The compressor may compress oxygen using electrical power of the lithium-oxygen battery. The compressor may generate electrical power by utilizing expansive pressure of compressed oxygen stored in the storage unit.

The battery system may include a power supplying unit configured to supply electrical power to the lithium-oxygen battery to charge the lithium-oxygen battery, and the oxygen compressing unit may compress oxygen released from the lithium-oxygen battery as a result of the power supplying unit charging the lithium-oxygen battery. The power supplying unit may supply electrical power generated by solar power generation to the lithium-oxygen battery.

A second aspect of the present invention provides a moving body including: the battery system; and a movement controlling unit configured to perform movement control using electrical power of the lithium-oxygen battery.

A third aspect of the present invention provides a moving body including: the battery system; and a wireless communication unit configured to perform wireless communication using electrical power of the lithium-oxygen battery.

A fourth aspect of the present invention provides the the moving body that is capable of flying and serves as a stratospheric platform.

Hereinafter, (some) embodiment(s) of the present invention will be described. The embodiment(s) do(es) not limit the invention according to the claims, and all the combinations of the features described in the embodiment(s) are not necessarily essential to means provided by aspects of the invention.

<FIG> schematically shows an example of a battery system <NUM>. The battery system <NUM> includes a lithium-oxygen battery <NUM>, an enclosure case <NUM> enclosing the lithium-oxygen battery <NUM>, a power supplying unit <NUM>, a compressor <NUM>, a compressor controlling unit <NUM>, and a compressed oxygen tank <NUM>.

The enclosure case <NUM> encloses and contains oxygen and at least one lithium-oxygen battery <NUM>. <FIG> shows an example in which the enclosure case <NUM> contains eight lithium-oxygen batteries <NUM>.

The lithium-oxygen battery <NUM> may be a battery in which oxygen is used as a positive electrode active material and lithium is used as a negative electrode active material. The lithium-oxygen battery <NUM> may be what is referred to as a lithium-air battery in which oxygen in the air is used as a positive electrode active material.

During the discharging of the lithium-oxygen battery <NUM>, lithium at the negative electrode dissolves, and lithium peroxide is deposited at the positive electrode side. During the charging of the lithium-oxygen battery <NUM>, lithium peroxide at the positive electrode decomposes, lithium is deposited on the negative electrode, and oxygen is released.

Desirably, the oxygen released from the lithium-oxygen battery <NUM> during the charging can be reused for the discharging. In the battery system <NUM> according to the present embodiment, oxygen released from the lithium-oxygen battery <NUM> is stored in a compressed form. Then, in the battery system <NUM>, the stored oxygen is supplied to the lithium-oxygen battery <NUM> for discharging the lithium-oxygen battery <NUM>.

Recycling oxygen contained in the enclosure case <NUM> in this manner enables efficient utilization of oxygen. Compared to the case of using oxygen in the air, it also enables supplying only oxygen to the lithium-oxygen battery <NUM> and improving the battery performance. Also, storing the compressed oxygen can significantly reduce the space for storage of oxygen as compared to the case without compressing the oxygen. This can realize miniaturization of the battery system <NUM>. If the battery system <NUM> is installed in a moving body such as a car or airplane, the miniaturization of the battery system <NUM> contributes to miniaturization of the moving body, for example.

As described above, compared to the conventional case of using oxygen in the environmental air for the discharging and releasing the oxygen into the air during the charging, the battery system <NUM> according to the present embodiment can achieve at least one of the following effects by recycling oxygen in the enclosure case <NUM>: improving the battery performance; enabling its use e.g., even under low air pressure such as in the stratosphere; and yielding sufficient energy even in an environment with a limited space such as in a submarine, aircraft or car. Thus, an effect of providing a battery system with an increased ratio of power capacity to volume as compared to the conventional case is achieved.

The power supplying unit <NUM> supplies electrical power to the lithium-oxygen battery <NUM> to charge the lithium-oxygen battery <NUM>. The power supplying unit <NUM> may supply electrical power generated by means of any power generation system to the lithium-oxygen battery <NUM>. For example, the power supplying unit <NUM> supplies electrical power generated by solar power generation to the lithium-oxygen battery <NUM>.

The compressor <NUM> compresses oxygen released from the lithium-oxygen battery <NUM>. The compressor <NUM> may compress oxygen released from the lithium-oxygen battery <NUM> as a result of the power supplying unit <NUM> charging the lithium-oxygen battery <NUM>. The compressor <NUM> may be an example of the oxygen compressing unit.

The compressor <NUM> may be connected to the enclosure case <NUM>, and may compress oxygen contained in the enclosure case <NUM>. The compressor <NUM> may be connected to the enclosure case <NUM> via a pipe. The compressor <NUM> may provide the compressed oxygen to be stored in the compressed oxygen tank <NUM>. The compressed oxygen tank <NUM> may be an example of the storage unit.

The compressor <NUM> may supply the oxygen stored in the compressed oxygen tank <NUM> to the lithium-oxygen battery <NUM>. The compressor <NUM> may be an example of the oxygen supplying unit. The compressor <NUM> may be connected to the enclosure case <NUM>, and may supply the oxygen stored in the compressed oxygen tank <NUM> to the enclosure case <NUM>.

The compressor controlling unit <NUM> controls the compressor <NUM>. The compressor controlling unit <NUM> may use electrical power supplied from the power supplying unit <NUM> for causing the compressor <NUM> to compress oxygen or to supply oxygen stored in the compressed oxygen tank <NUM> to the lithium-oxygen battery <NUM>. The compressor controlling unit <NUM> may also use electrical power provided by the lithium-oxygen battery <NUM> for causing the compressor <NUM> to compress oxygen or to supply oxygen stored in the compressed oxygen tank <NUM> to the lithium-oxygen battery <NUM>.

The compressor controlling unit <NUM> may cause the compressor <NUM> to generate electrical power by utilizing the expansive pressure of compressed oxygen stored in the compressed oxygen tank <NUM>. That is, the compressor <NUM> may generate electrical power by utilizing the expansive pressure of compressed oxygen stored in the compressed oxygen tank <NUM>.

The compressor <NUM> may include a compressing/expanding unit and a driving/power-generating unit. The compressing/expanding unit compresses and expands oxygen. The driving/power-generating unit drives the compressing/expanding unit to compress oxygen. For example, if the compressor <NUM> is a displacement compressor, the driving/power-generating unit drives a piston or screw rotor with a motor or the like to compress oxygen. Also, the driving/power-generating unit expands compressed oxygen stored in the compressed oxygen tank <NUM> to generate electrical power by utilizing its expansive pressure. For example, if the compressor <NUM> is a displacement compressor, the driving/power-generating unit converts force applied to the piston or screw rotor by the expansive pressure into electrical power. The driving/power-generating unit may generate electrical power by utilizing the expansive pressure in any other way. The compressor controlling unit <NUM> may supply electrical power generated by the compressor <NUM> to the lithium-oxygen battery <NUM> to charge the lithium-oxygen battery <NUM>.

As shown in <FIG>, the enclosure case <NUM> may include a blowing fan <NUM>. As shown in <FIG>, the enclosure case <NUM> may include a plurality of blowing fans <NUM> corresponding to the plurality of respective lithium-oxygen batteries <NUM>. Alternatively, the enclosure case <NUM> may include blowing fans <NUM> corresponding to the plurality of lithium-oxygen batteries <NUM> but fewer than the lithium-oxygen batteries <NUM>.

The blowing fan <NUM> may be disposed in the enclosure case <NUM> and blow oxygen supplied by the compressor <NUM> to the enclosure case <NUM> toward the lithium-oxygen battery <NUM>. The blowing fan <NUM> may blow oxygen to reach the positive electrode of the lithium-oxygen battery <NUM>.

While in the example of <FIG>, oxygen stored in the compressed oxygen tank <NUM> is supplied to the enclosure case <NUM> via the compressor <NUM>, this is not limited. Oxygen stored in the compressed oxygen tank <NUM> may be supplied to the enclosure case <NUM> not via the compressor <NUM>. For example, the compressed oxygen tank <NUM> and the enclosure case <NUM> may be connected so that oxygen stored in the compressed oxygen tank <NUM> is directly supplied to the enclosure case <NUM>. In this case, for example, a valve may be disposed between the compressed oxygen tank <NUM> and the enclosure case <NUM> to control whether or not to supply the oxygen by opening or closing the valve.

<FIG> schematically shows another example of the battery system <NUM>. <FIG> illustrates a case in which the battery system <NUM> includes an internal pressure measuring unit <NUM>, an internal pressure adjusting unit <NUM>, a temperature measuring unit <NUM>, a temperature adjusting unit <NUM>, a heater <NUM>, a blow rate adjusting unit <NUM>, and an environment adjusting unit <NUM>, in addition to the components described with reference to <FIG>. Note that the battery system <NUM> may not include all of these components and may include only some of them.

The internal pressure measuring unit <NUM> measures the internal pressure of the enclosure case <NUM>. For example, the internal pressure measuring unit <NUM> is any pressure sensor disposed in the enclosure case <NUM> to measure the air pressure in the enclosure case <NUM>.

The internal pressure adjusting unit <NUM> adjusts the internal pressure of the enclosure case <NUM>. The internal pressure adjusting unit <NUM> may maintain the internal pressure of the enclosure case <NUM> within a predetermined range. The predetermined range may be experimentally determined. For example, an experiment may be performed for measuring variation in performance of the lithium-oxygen battery <NUM> while varying the internal pressure of the enclosure case <NUM>, and a range of the internal pressure of the enclosure case <NUM> in which the performance of the lithium-oxygen battery <NUM> exceeds a threshold may be determined as the predetermined range.

The internal pressure adjusting unit <NUM> may cause the compressor <NUM> to compress oxygen contained in the enclosure case <NUM> if the internal pressure of the enclosure case <NUM> measured by the internal pressure measuring unit <NUM> is higher than the predetermined threshold. The internal pressure adjusting unit <NUM> may cause the compressor <NUM> to supply oxygen stored in the compressed oxygen tank <NUM> to the enclosure case <NUM> if the internal pressure of the enclosure case <NUM> measured by the internal pressure measuring unit <NUM> is lower than the predetermined threshold.

The internal pressure adjusting unit <NUM> may adjust the internal pressure of the enclosure case <NUM> by adjusting the rotation rate of the compressor <NUM>. For example, the internal pressure adjusting unit <NUM> increases the rotation rate of the compressor <NUM> to lower the internal pressure of the enclosure case <NUM>.

The battery system <NUM> may further include a valve to adjust the amount of supplying oxygen stored in the compressed oxygen tank <NUM> to the enclosure case <NUM>, and the internal pressure adjusting unit <NUM> may adjust the internal pressure of the enclosure case <NUM> by controlling the valve.

The internal pressure measuring unit <NUM> and the internal pressure adjusting unit <NUM> may use electrical power provided by the lithium-oxygen battery <NUM>. The internal pressure measuring unit <NUM> and the internal pressure adjusting unit <NUM> may also use electrical power supplied by the power supplying unit <NUM>.

The temperature measuring unit <NUM> measures the temperature in the enclosure case <NUM>. For example, the temperature measuring unit <NUM> is any temperature sensor disposed in the enclosure case <NUM> to measure the temperature in the enclosure case <NUM>.

The temperature adjusting unit <NUM> adjusts the temperature in the enclosure case <NUM>. The temperature adjusting unit <NUM> may maintain the temperature in the enclosure case <NUM> within a predetermined range. The predetermined range may be experimentally determined. For example, an experiment may be performed for measuring variation in performance of the lithium-oxygen battery <NUM> while varying the temperature in the enclosure case <NUM>, and a range of the temperature in the enclosure case <NUM> in which the performance of the lithium-oxygen battery <NUM> exceeds a threshold may be determined as the predetermined range.

The temperature adjusting unit <NUM> may adjust the temperature in the enclosure case <NUM> by heating oxygen supplied from the compressor <NUM> to the enclosure case <NUM> using the heater <NUM>, which is provided to a pipe connecting the enclosure case <NUM> and the compressor <NUM>.

The temperature adjusting unit <NUM> may adjust the temperature in the enclosure case <NUM> by heating inside the enclosure case <NUM> using a heater, which is not shown in the figure, provided in the enclosure case <NUM>.

The enclosure case <NUM> may be formed of any material capable of maintaining the internal pressure. Also, the enclosure case <NUM> may have a heat retaining property. The enclosure case <NUM> may include a thermal insulation material. The thermal insulation material may be a fiber-based thermal insulation material, foam-based thermal insulation material, vacuum thermal insulation material, etc. Specific examples of the fiber-based thermal insulation material include glass wool, rock wool, cellulose fiber, carbonized cork, wool thermal insulation material, etc. Specific examples of the foam-based thermal insulation material include urethane foam, phenolic foam, polystyrene foam, expanded polystyrene foam (EPS), extruded polystyrene foam (XPS), foamed rubber, etc..

While the use of a heater is described in the present example, this is not limited. The temperature adjusting unit <NUM> may adjust the temperature in the enclosure case <NUM> by cooling oxygen supplied from the compressor <NUM> to the enclosure case <NUM> or the inside of the enclosure case <NUM>. For example, the temperature adjusting unit <NUM> adjusts the temperature in the enclosure case <NUM> by cooling oxygen supplied from the compressor <NUM> to the enclosure case <NUM> using a Peltier device or the like, which is not shown in the figure, provided to a pipe connecting the enclosure case <NUM> and the compressor <NUM>, or by cooling inside the enclosure case <NUM> using a Peltier device or the like provided in the enclosure case <NUM>. The temperature adjusting unit <NUM> may adjust the temperature in the enclosure case <NUM> by controlling the heating and cooling of oxygen supplied from the compressor <NUM> to the enclosure case <NUM> or the inside of the enclosure case <NUM>.

The compressor controlling unit <NUM> may control the compressor <NUM> according to the operating mode of the battery system <NUM>. Operating modes may include a normal mode, a powered mode with a larger amount of electrical power supply than in the normal mode, an eco-mode with a smaller amount of electrical power supply than the normal mode, etc. Operating modes may include only two modes with different amounts of electrical power supply, or may include four or more modes.

For example, when the powered mode is selected, the compressor controlling unit <NUM> increases the amount of supplying oxygen stored in the compressed oxygen tank <NUM> to the enclosure case <NUM>. When the eco-mode is selected, the compressor controlling unit <NUM> may reduce the amount of supplying oxygen stored in the compressed oxygen tank <NUM> to the enclosure case <NUM>. For example, the compressor controlling unit <NUM> may adjust the amount of supplying oxygen stored in the compressed oxygen tank <NUM> to the enclosure case <NUM> by controlling the rotation rate of the compressor <NUM> and a valve to adjust the supply amount.

The environment adjusting unit <NUM> adjusts the environment of the lithium-oxygen battery <NUM>. The environment adjusting unit <NUM> may adjust the environment of the lithium-oxygen battery <NUM> by controlling at least one of: the internal pressure of the enclosure case <NUM>; the temperature in the enclosure case <NUM>; and the blow rate of the blowing fan <NUM>.

The environment adjusting unit <NUM> may adjust the environment of the lithium-oxygen battery <NUM> according to the operating mode of the battery system <NUM>. For example, when the powered mode is selected, the environment adjusting unit <NUM> causes the internal pressure adjusting unit <NUM> to raise the internal pressure of the enclosure case <NUM>, causes the temperature adjusting unit <NUM> to raise the temperature in the enclosure case <NUM>, or causes the blow rate adjusting unit <NUM> to increase the blow rate of the blowing fan <NUM>, in order to increase the amount of electricity discharged by the lithium-oxygen battery <NUM>. The environment adjusting unit <NUM> may perform only one of the three operations, or may perform two or more of them.

For example, when the eco-mode is selected, the environment adjusting unit <NUM> causes the internal pressure adjusting unit <NUM> to lower the internal pressure of the enclosure case <NUM>, causes the temperature adjusting unit <NUM> to lower the temperature in the enclosure case <NUM>, or causes the blow rate adjusting unit <NUM> to reduce the blow rate of the blowing fan <NUM>, in order to decrease the amount of electricity discharged by the lithium-oxygen battery <NUM>. The environment adjusting unit <NUM> may perform only one of the three operations, or may perform two or more of them.

When the powered mode is selected, the environment adjusting unit <NUM> may increase the amount of electricity discharged by the lithium-oxygen battery <NUM> by collectively controlling the internal pressure of the enclosure case <NUM>, the temperature in the enclosure case <NUM>, and the blow rate of the blowing fan <NUM>. That is, the environment adjusting unit <NUM> may increase the amount of electricity discharged by the lithium-oxygen battery <NUM> by performing any combination of: raising or lowering the internal pressure of the enclosure case <NUM>; raising or lowering the temperature in the enclosure case <NUM>; and increasing or reducing the blow rate of the blowing fan <NUM>.

When the eco-mode is selected, the environment adjusting unit <NUM> may reduce the amount of electricity discharged by the lithium-oxygen battery <NUM> by collectively controlling the internal pressure of the enclosure case <NUM>, the temperature in the enclosure case <NUM>, and the blow rate of the blowing fan <NUM>. That is, the environment adjusting unit <NUM> may decrease the amount of electricity discharged by the lithium-oxygen battery <NUM> by performing any combination of: raising or lowering the internal pressure of the enclosure case <NUM>; raising or lowering the temperature in the enclosure case <NUM>; and increasing or reducing the blow rate of the blowing fan <NUM>.

<FIG> schematically shows an example of the lithium-oxygen battery <NUM>. The lithium-oxygen battery <NUM> shown in <FIG> includes a porous current collector <NUM>, a porous carbon positive electrode <NUM>, a separator <NUM>, and a lithium metal negative electrode <NUM>, which are covered by a package <NUM>. Porous carbon positive electrodes <NUM> are disposed on both sides of a porous current collector <NUM>, which is formed of an oxygen-intaking material, and a separator <NUM> and a lithium metal negative electrode <NUM> are disposed in parallel, to form a stack. Oxygen in the enclosure case <NUM> is supplied to the stack via a vent hole <NUM> formed in the package <NUM>, and the oxygen is supplied to the porous carbon positive electrode <NUM> via the porous current collector <NUM>, so that a discharge reaction occurs.

The blowing fan <NUM> may blow oxygen toward the vent hole <NUM>. This can increase the probability of adsorbing oxygen to the porous carbon positive electrode <NUM>.

Note that the constitution of the lithium-oxygen battery <NUM> shown in <FIG> is an example, and the lithium-oxygen battery <NUM> may have another constitution. For example, the lithium-oxygen battery <NUM> does not have a stacked structure, and includes a pair of porous carbon positive electrodes <NUM>, a separator <NUM> and a lithium metal negative electrode <NUM>. The lithium-oxygen battery <NUM> may also have a stacked structure different from the constitution shown in <FIG>.

<FIG> schematically shows an example of a moving body <NUM>. The moving body <NUM> includes the battery system <NUM>, a movement controlling unit <NUM>, a communication controlling unit <NUM>, and a power generating unit <NUM>. The moving body <NUM> does not necessarily include all of these components.

The movement controlling unit <NUM> performs movement control of the moving body <NUM> using electrical power of the lithium-oxygen battery <NUM>. If the moving body <NUM> is a vehicle such as a motor vehicle, the movement controlling unit <NUM> controls the driving of the moving body <NUM>. For example, the battery system <NUM> may be used as a battery for an electric motor vehicle. If the moving body <NUM> is a flying body, the movement controlling unit <NUM> controls the flight of the moving body <NUM>.

The communication controlling unit <NUM> performs wireless communication using electrical power of the lithium-oxygen battery <NUM>. For example, the communication controlling unit <NUM> provides a wireless communication service for a wireless communication terminal such as a mobile phone by relaying the wireless communication terminal and a core network. For example, if the moving body <NUM> is a vehicle such as a motor vehicle, the moving body <NUM> may serve as a mobile base station vehicle. Also, for example, if the moving body <NUM> is a flying body, the moving body <NUM> may serve as a stratospheric platform.

The power generating unit <NUM> generates electrical power. For example, the power generating unit <NUM> generates electrical power by solar power generation. The power generating unit <NUM> may supply the generated electrical power to the power supplying unit <NUM> of the battery system <NUM>. The power supplying unit <NUM> may supply the electrical power received from the power generating unit <NUM> to the lithium-oxygen battery <NUM>, the compressor controlling unit <NUM>, etc..

The power generating unit <NUM> may supply the generated electrical power to the movement controlling unit <NUM>. The power generating unit <NUM> may also supply the generated electrical power to the communication controlling unit <NUM>.

While the embodiments of the present invention have been described, the technical scope of the invention is not limited to the above described embodiments. It is apparent to persons skilled in the art that various alterations and improvements can be added to the above-described embodiments. It is also apparent from the scope of the claims that the embodiments added with such alterations or improvements can be included in the technical scope of the invention.

Claim 1:
A battery system (<NUM>) comprising:
a lithium-oxygen battery (<NUM>);
an enclosure case (<NUM>) enclosing the lithium-oxygen battery;
an oxygen compressing unit connected to the enclosure case (<NUM>) and configured to compress oxygen released from the lithium-oxygen battery (<NUM>);
a storage unit (<NUM>) configured to store oxygen compressed by the oxygen compressing unit; and
an oxygen supplying unit connected to the enclosure case (<NUM>) and configured to supply oxygen stored in the storage unit (<NUM>) to the lithium-oxygen battery (<NUM>);
a temperature measuring unit (<NUM>) configured to measure a temperature in the enclosure case (<NUM>);
a heater (<NUM>) configured to heat inside the enclosure case (<NUM>); and
a temperature adjusting unit (<NUM>) configured to maintain the temperature in the enclosure case (<NUM>) within a predetermined range by using the heater (<NUM>).