JP2007080779A - Battery integrally formed substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery integrally formed substrate applied in a power supply system in a satellite structure in which an installation space is reduced, while securing rigidity capable of enduring a shock impressed on the satellite structure. <P>SOLUTION: The battery integrally formed substrate 20 is provided with a battery housing body 1 which is formed of a fiber reinforced composite material and is constructed of a grid structure in which unit cell spaces 4 of cylindrical shape with the top and the bottom faces open are regularly arranged, a first outer package case 7a and a second outer package case 7b which are laminated at the upper and the lower part of the battery housing body 1 and installed integrally to the battery housing body 1, and close the openings at the top and the bottom faces of the unit cell spaces 4, and lithium ion batteries 5a-5f arranged in the unit cell spaces 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a battery-integrated substrate applied to a power supply system in a satellite structure.

  In a conventional power supply system in a satellite structure, power generated by a solar cell is stored in an aggregate battery in the satellite structure, and power is supplied from there to each device. In addition, the voltage generated by the solar cell is boosted to several tens of volts and transmitted in order to minimize power transmission loss that occurs in the power supply line between the aggregate battery and each device. Therefore, a conventional power supply system in a satellite structure is provided with a booster and complicated and long wiring.

  In a conventional consumer photovoltaic power generation device, an electric double layer capacitor and a control unit as a capacitor are provided on the back side of a solar battery cell. In addition, the electric double layer capacitor and the control unit are disposed so as to be accommodated in an outer case provided integrally with the solar battery cell. The electric power generated by the solar battery cell is stored in the electric double layer capacitor without complicated and long wiring by arranging the solar battery cell and the electric double layer capacitor integrally.

Further, a night illumination device is provided by arranging a light emitting diode in an exterior case of the consumer solar power generation device. Since the light emitting diode is installed in the vicinity of the electric double layer capacitor, there is almost no power transmission loss.
Furthermore, by using a thin electric double layer capacitor having a specific thickness or less, a solar power generation device and a night illumination device excellent in space saving, light weight, and workability are provided (for example, Patent Documents). 1).

JP 2002-151717 A

In the conventional power supply system in the satellite structure, the generated voltage is boosted to several tens of volts in order to suppress transmission loss as much as possible, so that 3.7V specification consumer electronic components cannot be used. In addition, dedicated parts are required to use the boosted voltage, and there are problems such as increased costs and longer delivery times for parts. Furthermore, since it is necessary to provide a booster and complicated and long wiring, a large installation space must be secured.
In addition, a conventional solar power generation apparatus using an electric double layer capacitor has a small capacity and is not suitable for use in applications that require a relatively large amount of power. Furthermore, it is designed for consumer use and does not have enough rigidity to withstand the impact on the satellite structure.

  The present invention has been made in order to solve the above-described problems, makes it possible to use a consumer electronic component of 3.7 V specifications by eliminating a power transmission loss between a power storage device and a power transmission destination device, and a satellite. It is an object of the present invention to provide a battery-integrated substrate that is applied to a power supply system in a satellite structure that has reduced installation space while ensuring rigidity that can withstand an impact on the structure.

  A battery-integrated substrate according to the present invention includes a battery container that is formed of a fiber-reinforced composite material and has a grid structure in which cylindrical unit cell spaces whose upper and lower surfaces are open are regularly arranged; A first skin and a second skin that are stacked on the top and bottom of the body and integrally attached to the battery housing, and respectively close the openings on the upper and lower surfaces of the unit cell space, and are disposed in the unit cell space. A lithium ion battery.

  According to the present invention, since the lithium ion battery is integrally attached to the unit cell space of the grid-structured battery container formed of a lightweight and rigid fiber-reinforced composite material, high rigidity and installation space can be reduced. A battery integrated substrate that can be reduced can be obtained.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view for explaining the structure of a battery housing body of a battery-integrated substrate applied to a power supply system in a satellite structure according to an embodiment of the present invention, and FIG. 2 is a configuration of the battery housing body in FIG. FIG. 3 is a plan view of the battery-integrated substrate according to the embodiment of the present invention as viewed from above. FIG. 4 is a plan view of the first skin and solar cell unit in FIG. FIG. 5 is a cross-sectional view taken along arrows IV-IV in FIG.

1 and 2, the battery housing 1 is composed of a first CFRP group 3a to a third CFRP group 3c described below.
As a material constituting the battery housing 1, CFRP (carbon fiber reinforced plastic) which is one of lightweight and excellent fiber reinforced composite materials is used. In CFRP, an epoxy resin is used for a matrix (base material), and PAN-based carbon fibers made from acrylic long fibers, which are synthetic resins, are mixed in the matrix as a reinforcing material.

  The first CFRP group 3a is formed by arranging a plurality of units CFRP 2a formed in an elongated rectangular flat plate shape. The plurality of units CFRP2a are arranged on the same plane at regular intervals so that the long sides forming the rectangular plane are parallel to each other.

  The second CFRP group 3b is formed by arranging a plurality of units CFRP 2b described below. The unit CFRP2b is obtained by rotating the unit CFRP2a by -60 degrees around the perpendicular of the rectangular surface. The plurality of units CFRP2b are arranged on the same plane at regular intervals so that the long sides forming the rectangular plane are parallel to each other. Here, the formation surface of the second CFRP group 3b is in a positional relationship parallel to the formation surface of the first CFRP group 3a.

  The third CFRP group 3c is formed by arranging a plurality of units CFRP2c described below. The unit CFRP2c is obtained by rotating the unit CFRP2a by 60 degrees with the perpendicular of the rectangular surface as an axis. The plurality of units CFRP2c are arranged on the same plane at regular intervals so that the long sides forming the rectangular plane are parallel to each other. Here, the formation surface of the third CFRP group 3c is in a positional relationship parallel to the formation surfaces of the first CFRP group 3a and the second CFRP group 3b.

  The battery housing 1 is formed by stacking the first CFRP group 3a to the third CFRP group 3c in order in a number of layers. That is, the battery housing 1 is partitioned by the first CFRP group 3a to the third CFRP group 3c, and has a grid structure in which regular hexagonal cylindrical spaces whose upper and lower surfaces are opened are regularly arranged. It is configured. The space of each regular hexagonal cylindrical body is defined as a unit cell space 4. The size of the regular hexagon of the unit cell space 4 is formed such that, for example, a circle having a diameter of 100 mm is inscribed in the regular hexagon. The thickness in the direction perpendicular to the surface forming the regular hexagon is 1 inch (24.5 mm).

  The battery housing 1 configured in a grid structure using CFRP as a material is characterized by being lightweight and excellent in rigidity. However, the outer shape of the unit cell space 4 is a regular hexagon, so that the rigidity is higher than other shapes. Is obtained.

Next, the structure of the battery integrated substrate 20 will be described.
As shown in FIGS. 4 and 5, lithium ion batteries 5 a to 5 f are respectively disposed in six of the plurality of unit cell spaces 4 of the battery housing 1. The lithium ion batteries 5a to 5f are excellent in energy density and have an output voltage of 3.5 to 3.8V. In this embodiment, a battery having an output voltage of 3.7 V per battery and a performance of 3.7 Ah is used.

The lithium ion batteries 5a to 5f are formed in a rectangular parallelepiped. The lithium ion batteries 5a to 5f are arranged so that each of the short sides on the upper and lower surfaces of the rectangular parallelepiped is in contact with each of the two parallel sides of the regular hexagon that is the shape of the opening surface of the unit cell space 4. Yes.
Further, the control circuit unit 18 of the lithium ion batteries 5a to 5f is disposed in the cylindrical body space 10 generated in the unit cell space 4 after the lithium ion batteries 5a to 5f are disposed.

  Also, as shown in FIGS. 3 to 5, the first skin 7 a and the second skin 7 b formed in a rectangular flat plate shape are fixed so as to close the openings on the upper and lower surfaces of the battery housing 1. ing. That is, the battery container 1 is sandwiched between the first skin 7a and the second skin 7b, and has a sandwich structure. The first skin 7a and the second skin 7b are required to have high heat dissipation, and are formed of, for example, pitch-type carbon fibers having excellent thermal conductivity as reinforcing fibers and CFRP using an epoxy resin as a matrix. .

  Furthermore, a plurality of solar cells 6 are integrally attached to the surface side of the first skin 7a. As the solar cell, a Si-based solar cell is used, and the electromotive force per cell of the solar cell 6 is 0.5V. Each of the solar cell units 8a to 8f is configured by connecting 8 solar cells 6 in series. In solar cell unit 8a-8f, the electromotive force of 8 cells of the photovoltaic cell 6 has arisen between the both ends 15a, 15b of the eight photovoltaic cells 6 connected in series.

  The tips of the pair of wirings 17 extending from both end portions 15 a and 15 b of the solar cell units 8 a to 8 f penetrate the first skin 7 a and are located in the cylindrical body space 10. A power transmission connector 11 as a connection portion is attached to the tip of the wiring 17. Moreover, the 1st terminal 12 as a terminal part is attached to the side surface upper part of lithium ion battery 5a-5f so as to correspond to the connector 11 for electric power transmission. By fitting the first terminal 12 to the power transmission connector 11, the solar cell units 8a to 8f and the lithium ion batteries 5a to 5f are electrically connected, and the solar cell units 8a to 8f. The electric power generated at is stored in the lithium ion batteries 5a to 5f, respectively.

  Each of the lithium ion batteries 5a to 5f is disposed in the unit cell space 4 immediately adjacent to the solar battery cell units 8a to 8f via the first skin 7a. Accordingly, the wiring 17 connecting the solar cell units 8a to 8f and the lithium ion batteries 5a to 5f does not need to be complicated and long, and the solar cell units 8a to 8f and the lithium ion batteries 5a to 5f are not connected. The transmission loss is significantly reduced.

  The device unit housing 19 is integrally attached to the second skin 7b so as to face the battery housing 1 with the second skin 7b interposed therebetween. Further, the devices 13 a to 13 c are arranged inside the device unit housing 19.

The devices 13a to 13c disposed in the device unit casing 19 are disposed in the immediate vicinity of the lithium ion batteries 5a to 5c disposed in the unit cell space 4 via the second skin 7b. Yes.
Similarly, the three devices 13d to 13f are also disposed in the immediate vicinity of the lithium ion batteries 5d to 5f disposed in the unit cell space 4 via the second skin 7b.

  Further, the other end side of the pair of wirings 9 whose one ends are connected to the devices 13 a to 13 f penetrates the second skin 7 b and is located in the cylindrical body space 10. Further, a power supply connector 16 as a connecting portion is attached to the other end side of the wiring 9. Further, the second terminal 14 as a terminal portion is attached to the lower part of the side surface of the lithium ion batteries 5 a to 5 f so as to correspond to the power supply connector 16. By fitting the power supply connector 16 and the second terminal 14, the devices 13a to 13f are electrically connected to the lithium ion batteries 5a to 5f, and the power stored in the lithium ion batteries 5a to 5f is received. It is supplied to the devices 13a to 13f.

  The wiring 9 for supplying power from the lithium ion batteries 5a to 5f to the devices 13a to 13f does not need to use complicated and long wiring, and power transmission loss in power supply is significantly reduced. Therefore, there is no need to increase the voltage to be higher than the voltage of the lithium ion batteries 5a to 5f, so that the booster is not necessary, and the power is transmitted to each device with the voltage of the lithium ion batteries 5a to 5f being 3.7V. Is possible. For this reason, it is possible to use inexpensive consumer electronic devices and electronic parts having an electrical specification of about 3.7V. Since consumer electronics and electronic parts are widely used, the delivery time of parts can be expected to be shortened.

  Further, the booster is not required, and the lithium ion batteries 5a to 5f, the power delivery connector 11, the power supply connector 16, the first terminal 12 and the second terminal are provided in the unit cell space 4 of the battery housing 1. Since the terminal 14, the control circuit unit 18, and the like can be disposed, the battery-integrated substrate 20 can be downsized, and the installation space can be reduced.

  According to this embodiment, the battery container 1 of the battery-integrated substrate 20 has a grid structure made of CFRP that is lightweight and excellent in rigidity. Moreover, the opening of the upper and lower surfaces of the battery housing 1 is closed by the first skin 7a and the second skin 7b to form a sandwich structure. In addition, a plurality of solar cells 6 are integrally attached to the surface of the first skin 7a, and further, solar cell units 8a to 8f are configured by connecting six solar cells 6 in series. Yes.

Further, 3.7 V output lithium ion batteries 5 a to 5 f are arranged in the unit cell space 4 of the battery housing 1. Furthermore, the solar cell units 8a to 8f are electrically connected to lithium ion batteries 5a to 5f disposed in the nearest unit cell space 4 through the first skin 7a, respectively.
Accordingly, the wiring 17 connecting the solar cell units 8a to 8f and the lithium ion batteries 5a to 5f does not need to be complicated and long, and the solar cell units 8a to 8f and the lithium ion batteries 5a to 5f are not connected. The transmission loss is significantly reduced.

The devices 13a to 13f are electrically connected to the lithium ion batteries 5a to 5f respectively disposed in the unit cell space 4 closest to the devices 13a to 13f via the second skin 7b. Power is supplied to the lithium ion batteries 5a to 5f to 13a to 13f.
Therefore, the wiring 9 for supplying power from the lithium ion batteries 5a to 5f to the devices 13a to 13f does not need to use complicated and long wiring, and the power transmission loss in the power supply is remarkably reduced. Therefore, since there is no need to increase the voltage to be higher than the voltage of the lithium ion batteries 5a to 5f and perform power transmission, no booster is required. Therefore, it is possible to transmit power to each device while the voltage of the lithium ion batteries 5a to 5f is 3.7V. For this reason, it is possible to use inexpensive consumer electronic devices and electronic parts having an electrical specification of about 3.7V.

  Further, inside the unit cell space 4 of the battery housing 1, the lithium ion batteries 5a to 5f, the power transmission connector 11 and the power supply connector 16 as the connection parts, the first terminal 12 and the second terminal as the terminal parts are provided. Since the terminal 14, the control circuit unit 18, and the like can be disposed, the battery-integrated substrate 20 can be downsized, and the installation space can be reduced.

  Furthermore, since the battery container 1 of the battery-integrated substrate 20 has a grid structure made of CFRP that is lightweight and has excellent rigidity, high rigidity can be obtained. In particular, since the outer shape of the unit cell space 4 of the grid structure of the battery housing 1 is a regular hexagon, higher rigidity can be obtained than the grid structure having other outer shapes.

In the above embodiment, the CFPR matrix that is the constituent material of the battery housing 1 is an epoxy resin. However, the matrix is not particularly limited to an epoxy resin, and a polyester resin, a phenol resin, a polyimide resin, or the like is used. May be. The reinforcing material is PAN-based, but is not limited to PAN-based, and pitch-based carbon fiber made of petroleum pitch or the like may be used.
Furthermore, the material which comprises the battery container 1 may use other fiber reinforced composite materials, such as C / C (carbon fiber reinforced carbon composite material) other than CFRP.

In addition, the outer shape of the unit cell space 4 in the battery container 1 is a regular hexagon, but is not limited to a regular hexagon, and is triangular as long as it can withstand rigidity in an environment where the battery container 1 is used. Other shapes such as a square or an octagon may be used.
The constituent material of the first skin 7a and the second skin 7b is CFRP using pitch-based carbon fibers, but is not limited to pitch-based carbon fibers, and is lightweight and thermally conductive. A metal material having excellent properties and other composite materials may be used.

Moreover, although the shape of the lithium ion batteries 5a-5f was a rectangular parallelepiped, it is not limited to a rectangular parallelepiped, and may be a triangular prism or other shapes.
Although six lithium ion batteries 5a to 5f are arranged, the number of arranged lithium ion batteries is not limited to six, and may be set as appropriate according to the specification. Moreover, although the solar cell units 8a to 8f connected to the lithium ion batteries 5a to 5f are also 6 units, they may be appropriately set according to the number of lithium ion batteries.

Moreover, although the output voltage of the lithium ion batteries 5a to 5f is 3.5V to 3.8V, the output voltage is not limited to 3.5V to 3.8V, and other output voltages may be used depending on the specifications. Alternatively, a lithium ion battery may be used.
Moreover, although the photovoltaic cell units 8a-8f shall be comprised by connecting eight photovoltaic cells 6 in series, the number of the photovoltaic cells 6 connected in series is not limited to eight. What is necessary is just to set suitably according to the output voltage of a lithium ion battery.

It is a perspective view for demonstrating the structure of the battery container of the battery integrated board | substrate applied to the power supply system in the satellite structure which concerns on embodiment of this invention. It is a partial exploded view for demonstrating the structure of the battery container in FIG. It is the top view which looked at the battery integrated substrate which concerns on embodiment of this invention from upper direction. It is a perspective view which does not consider a 1st skin and a photovoltaic cell unit in FIG. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 3.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Battery container, 7a 1st skin, 7b 2nd skin, 4 unit cell space, 5a-5f Lithium ion battery, 6 solar cell, 8a-8f solar cell unit, 10 cylindrical body space, 13a- 13f Equipment, 11 Power transmission connector (connection portion), 16 Power supply connector (connection portion), 12 First terminal (terminal portion), 14 Second terminal (terminal portion), 18 Control circuit portion, 20 Battery Integrated substrate.

Claims (6)

A battery container made of a fiber reinforced composite material and having a grid structure in which cylindrical unit cell spaces whose upper and lower surfaces are open are regularly arranged;
A first skin layer and a second skin layer, which are laminated above and below the battery housing body and are integrally attached to the battery housing body, respectively closing the openings on the upper and lower surfaces of the unit cell space;
A lithium ion battery disposed in the unit cell space;
A battery-integrated substrate comprising: A plurality of solar cells integrally attached to the surface of the first skin,
A solar cell unit configured by connecting a predetermined number of the solar cells in series is disposed in the unit cell space immediately adjacent to the solar cell unit via the first skin. 2. The battery-integrated substrate according to claim 1, wherein the battery-integrated substrate is electrically connected to the lithium ion battery so that electric power of the solar cell unit is stored in the lithium lithium ion battery. A device unit housing integrally attached to the second skin so as to face the battery housing with the second skin interposed therebetween, and a device disposed inside the device unit housing,
The device is electrically connected to the lithium ion battery disposed in the unit cell space nearest to the device via the second skin, and the device is powered by the lithium ion battery. The battery-integrated substrate according to claim 2, wherein the battery-integrated substrate is supplied.   The battery-integrated substrate according to any one of claims 1 to 3, wherein an output voltage of the lithium ion battery is 3.5 to 3.8 volts.   5. The battery-integrated substrate according to claim 1, wherein an outer shape of the unit cell space is a regular hexagon. 6.   After the lithium ion battery is disposed, the solar cell unit and the connection portion and terminal portion for electrically connecting the device and the lithium ion battery, and the control circuit portion of the lithium ion battery are disposed. 6. The battery-integrated substrate according to claim 3, wherein the battery-integrated substrate is disposed in a cylindrical body space generated in the unit cell space.

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