Battery unit, battery module, power storage system, electronic device, electric power system, and electric vehicle
A battery unit includes a box-shaped case in which a plurality of secondary batteries are stored and that includes a front face, a back face, a first lateral face, a second lateral face, a first main face, and a second main face, a first heat-transfer face that is provided on one faces of the first and second main faces of the case, a second heat-transfer face that is formed on at least one faces of the first and second lateral faces and is continued to the first heat-transfer face, and an insulating face that is formed on the front face, the back face, the other faces of the first and second main faces, and an inner face of the second heat-transfer face. In the battery unit, a battery element of the secondary batteries is stored in an outer package member and positive and negative electrode tabs are led out.
1. A battery unit, comprising:
a box-shaped case in which a plurality of secondary batteries are stored, wherein the box-shaped case includes a front face, a back face opposed to the front face, a first lateral face, a second lateral face opposed to the first lateral face, a first main face, and a second main face opposed to the first main face;
a first heat-transfer face on a first face of one of the first main face or the second main face of the box-shaped case, wherein:
the first heat-transfer face on the first face is exposed, wherein the first face is an inner surface of the box-shaped case, and
at least one of the plurality of secondary batteries is fixed to the first heat-transfer face;
second heat-transfer faces on the first lateral face and the second lateral face, wherein
the second heat-transfer faces continue up to a position which is slightly below a second face of one of the first main face or the second main face,
the second face is opposite to the first face, and
the second heat-transfer faces are continued with the first heat-transfer face;
an insulating face including portions on at least one of the front face, the back face, one of the first main face or the second main face, or inner faces of the second heat-transfer faces;
a first holder in a first space of the box-shaped case, wherein the first space is between the front face of the box-shaped case and front faces of the plurality of secondary batteries,
wherein:
each secondary battery of the plurality of secondary batteries is in an outer package member, and
the plurality of secondary batteries are layered in the box-shaped case;
a second holder in a second space of the box-shaped case, wherein the second space is between the back face of the box-shaped case and back faces of the plurality of secondary batteries;
a first conductive portion configured to connect with a first plurality of positive electrode tabs of the plurality of secondary batteries and a first plurality of negative electrode tabs of the plurality of secondary batteries, wherein the first holder includes the first conductive portion;
a second conductive portion configured to connect with a second plurality of positive electrode tabs of the plurality of secondary batteries and a second plurality of negative electrode tabs of the plurality of secondary batteries, wherein the second holder includes the second conductive portion;
a first connector configured to connect with the first conductive portion, wherein the first connector is in a first concave portion of the first holder;
a second connector configured to connect with the second conductive portion, wherein the second connector is in a second concave portion of the second holder;
a connection line configured to couple the first connector with the second connector, wherein the connection line is on the second main face;
a sleeve holder inserted in at least one of the first holder or the second holder, wherein
the sleeve holder is fastened to the at least one of the first holder or the second holder by a fastening member that penetrates the sleeve; and
a thermal conductive sheet between two adjacent secondary batteries of the plurality of secondary batteries, wherein
the thermal conductive sheet is a double-faced adhesive tape.
2. The battery unit according to claim 1 , wherein:
a first rectangular slit, in the first holder, is configured to penetrate the first holder in an electrode lead-out direction,
the first conductive portion, is exposed in the first rectangular slit, and
end portions of the first plurality of positive electrode tabs and the first plurality of negative electrode tabs, are inserted from one opening of the first rectangular slit, and are connected with the first conductive portion.
3. The battery unit according to claim 2 , wherein
a second rectangular slit is in the second holder,
the second conductive portion, is exposed in the second rectangular slit, and
end portions of the second plurality of positive electrode tabs and the second plurality of negative electrode tabs, are inserted from one opening of the second rectangular slit, and are connected with the second conductive portion.
4. A battery module, comprising:
at least two battery units that are layered and opposed to each other, and have a gap there between, wherein each of the at least two battery units includes:
a box-shaped case in which a plurality of secondary batteries are stored, wherein the box-shaped case includes a front face, a back face opposed to the front face, a first lateral face, a second lateral face opposed to the first lateral face, a first main face, and a second main face opposed to the first main face;
a first heat-transfer face on a first face of one of the first main face or the second main face of the box-shaped case, wherein:
the first heat-transfer face on the first face is exposed, wherein the first face is an inner surface of the box-shaped case, and
at least one of the plurality of secondary batteries is fixed to the first heat-transfer face;
second heat-transfer faces on the first lateral face and the second lateral face, wherein
the second heat-transfer faces continue up to a position which is slightly below a second face of one of the first main face or the second main face,
the second face is opposite to the first face, and
the second heat-transfer faces are continued with the first heat-transfer face;
an insulating face including portions on at least one of the front face, the back face, one of the first main face or the second main face, or inner faces of the second heat-transfer faces;
a first holder in a first space of the box-shaped case, wherein the first space is between the front face of the box-shaped case and front faces of the plurality of secondary batteries,
wherein:
each secondary battery of the plurality of secondary batteries is in an outer package member, and
the plurality of secondary batteries are layered in the box-shaped case;
a second holder in a second space of the box-shaped case, wherein the second space is between the back face of the box-shaped case and back faces of the plurality of secondary batteries;
a first conductive portion configured to connect with a first plurality of positive electrode tabs of the plurality of secondary batteries and a first plurality of negative electrode tabs of the plurality of secondary batteries, wherein the first holder includes the first conductive portion;
a second conductive portion configured to connect with a second plurality of positive electrode tabs of the plurality of secondary batteries and a second plurality of negative electrode tabs of the plurality of secondary batteries, wherein the second holder includes the second conductive portion;
a first connector configured to connect with the first conductive portion, wherein the first connector is in a first concave portion of the first holder;
a second connector configured to connect with the second conductive portion, wherein the second connector is in a second concave portion of the second holder;
a connection line configured to couple the first connector with the second connector, wherein the connection line is on the second main face; and
a sleeve holder inserted in at least one of the first holder or the second holder, wherein
the sleeve holder is fastened to the at least one of the first holder or the second holder by a fastening member that penetrates the sleeve holder,
the gap between a first battery unit of the at least two battery units and a second battery unit of the at least two battery units is based on a length of the sleeve holder greater than a thickness of the first battery unit, and
the sleeve holder corresponds to the first battery unit.
5. The battery unit according to claim 1 , wherein the battery unit is charged by a power generation device configured to generate power from renewable energy.
6. The battery unit according to claim 1 , wherein the battery unit is included in a power storage device configured to supply power to an electronic device that is connected with the battery unit.
7. The battery unit according to claim 1 , wherein the battery unit is further configured to supply power to an electronic device that is connected to the battery unit.
8. The battery unit according to claim 1 , wherein:
the battery unit is further configured to supply electric power to a conversion device in an electric vehicle,
the conversion device is configured to convert the electric power into driving force of the electric vehicle, and
the electric vehicle includes a control device configured to execute information processing about the electric vehicle based on information about the battery unit.
9. The battery unit according to claim 1 , wherein one of charge control or discharge control of the battery unit is based on information received from an electronic device, connected to the battery unit, via a network.
10. The battery unit according to claim 1 , wherein the battery unit is further configured to receive power from at least one of an electric generation device or a power network.
11. The battery unit according to claim 1 , wherein the first conductive portion comprises at least one of nickel or copper.
12. The battery unit according to claim 1 , wherein the outer package member comprises a thermal fusion resin layer, a metallic layer and a surface protection layer that are sequentially arranged.
13. The battery unit according to claim 1 , wherein the first heat-transfer face is made of aluminum, and each of the second heat-transfer faces has a bilayer structure comprising the insulating face and aluminum.
14. The battery unit according to claim 1 , wherein an outer peripheral face of the sleeve holder has a truncated cone shape.
15. The battery module according to claim 4 , wherein
the sleeve holder that corresponds to the first battery unit has a first diameter,
a sleeve holder that corresponds to a second battery unit of the at least two battery units has a second diameter, and
the first diameter is larger than the second diameter.