Structural battery for vehicle

1 . A structural battery for an electric vehicle, the structural battery comprising:

an upper rail comprising a first current collecting layer, a first electrode layer, a second current collecting layer, a second electrode layer, and a third current collecting layer sequentially stacked from top to bottom; and

a lower rail coupled with the upper rail, wherein the lower rail comprises a fourth current collecting layer, a third electrode layer, and a fifth current collecting layer sequentially stacked from top to bottom;

wherein the upper rail and the lower rail are electrically connected with each other by a terminal and a wiring so that the upper rail and the lower rail serve as both the structural battery and a roof rail of a vehicle body;

wherein each of the first, the second, and the third electrode layers comprises a positive electrode layer, an electrolyte layer, and a negative electrode layer sequentially stacked from top to bottom;

wherein the positive electrode layer and the negative electrode layer comprise a positive electrode active material and a negative electrode active material, respectively, between glass fiber prepregs; and

wherein the electrolyte layer comprises an electrolyte between glass fibers.

2 . The structural battery of claim 1 , wherein outermost upper and lower layers of the upper rail and the lower rail, respectively, are structural reinforcement layers.

3 . The structural battery of claim 2 , wherein, between a first structural reinforcement layer, of the structural reinforcement layers, and the upper rail or the lower rail, an insulating layer and a sealing layer are sequentially stacked starting from the first structural reinforcement layer.

4 . The structural battery of claim 2 , wherein the upper rail or the lower rail comprises one cell or a plurality of cells.

5 . The structural battery of claim 4 , wherein:

the upper rail comprises one cell; and

the lower rail comprises two cells disposed under the upper rail.

6 . The structural battery of claim 4 , wherein:

the upper rail comprises one cell; and

the lower rail comprises one cell disposed under the upper rail.

7 . The structural battery of claim 4 , wherein:

the upper rail comprises two cells stacked on each other; and

the lower rail comprises two cells disposed under the upper rail.

8 . A structural battery for an electric vehicle, the structural battery comprising:

an upper rail comprising two cells stacked on each other, wherein the upper rail comprises a first current collecting layer, a first electrode layer, a second current collecting layer, a second electrode layer, and a third current collecting layer sequentially stacked from top to bottom; and

a lower rail coupled with the upper rail, the lower rail comprising one cell disposed under the upper rail, wherein the lower rail comprises a fourth current collecting layer, a third electrode layer, and a fifth current collecting layer sequentially stacked from top to bottom;

wherein the upper rail and the lower rail are electrically connected with each other by a terminal and a wiring, so that the upper rail and the lower rail serve as both the structural battery and a roof rail of a vehicle body;

wherein outermost upper and lower layers of the upper rail and lower rail, respectively, are structural reinforcement layers;

wherein each of the first, the second, and the third electrode layers comprises a positive electrode layer, an electrolyte layer, and a negative electrode layer sequentially stacked from top to bottom;

wherein the positive electrode layer and the negative electrode layer comprise a positive electrode active material and a negative electrode active material, respectively, between glass fiber prepregs; and

wherein the electrolyte layer comprises an electrolyte between glass fibers.

9 . The structural battery of claim 8 , wherein:

on a first side of the lower rail, a lower rail-negative electrode terminal is interposed between the structural reinforcement layer of the outermost upper layer of the lower rail and the fourth current collecting layer; and

on a second side of the lower rail, a lower rail-positive electrode terminal is interposed between the structural reinforcement layer of the outermost lower layer of the lower rail and the fifth current collecting layer.

10 . The structural battery of claim 9 , wherein:

on a first side of the upper rail, an upper rail-positive electrode terminal is interposed between the structural reinforcement layer of the outermost upper layer of the upper rail and the first current collecting layer; and

on a second side of the upper rail, an upper rail-negative electrode terminal is interposed between the structural reinforcement layer of the outermost lower layer of the upper rail and the third current collecting layer.

11 . The structural battery of claim 10 , wherein the structural reinforcement layer of the upper rail and the structural reinforcement layer of the lower rail are adhesively bonded with each other by a structural adhesive.

12 . The structural battery of claim 10 , wherein the lower rail-negative electrode terminal and the upper rail-positive electrode terminal are adhesively bonded with each other by a conductive adhesive.

13 . The structural battery of claim 10 , wherein:

the lower rail-positive electrode terminal and the upper rail-negative electrode terminal are electrically connected with each other by the wiring; and

the wiring is inserted into a flange groove positioned in an edge of a flange on which the lower rail is mounted and extracted to an outside of the lower rail.

14 . The structural battery of claim 13 , wherein:

the wiring is defined by a covering that covers a negative electrode-wiring terminal and a positive electrode-wiring terminal;

the negative electrode-wiring terminal is connected to the upper rail-negative electrode terminal; and

the positive electrode-wiring terminal is connected to the lower rail-positive electrode terminal.

15 . The structural battery of claim 14 , wherein the covering of the wiring is adhesively fixed into the flange groove by a fixing adhesive.

16 . The structural battery of claim 11 , wherein the lower rail-positive electrode terminal and the upper rail-negative electrode terminal are connected with each other in a direction perpendicular to the wiring to form an ‘L’-shaped path.

17 . A vehicle comprising:

a vehicle body comprising a floor;

a roof coupled to the vehicle body;

a high voltage battery coupled to the floor; and

a structural battery disposed in front of the roof in a transverse direction of the vehicle and connected with the high voltage battery, wherein the structural battery comprises:

an upper rail comprising at least one cell, wherein the upper rail comprises a first current collecting layer, a first electrode layer, a second current collecting layer, a second electrode layer, and a third current collecting layer sequentially stacked from top to bottom; and

a lower rail comprising at least one cell, the lower rail being electrically connected to the upper rail by a terminal and a wiring so that the upper rail and the lower rail serve as both the structural battery and a roof rail of the vehicle body,

wherein the lower rail comprises a fourth current collecting layer, a third electrode layer, and a fifth current collecting layer sequentially stacked from top to bottom,

wherein each of the first, the second, and the third electrode layers comprises a positive electrode layer, an electrolyte layer, and a negative electrode layer sequentially stacked from top to bottom;

wherein the positive electrode layer and the negative electrode layer comprise a positive electrode active material and a negative electrode active material, respectively, between glass fiber prepregs; and

wherein the electrolyte layer comprises an electrolyte between glass fibers.

18 . The vehicle of claim 17 , wherein:

outermost upper and lower layers of the upper rail and the lower rail, respectively, are structural reinforcement layers;

on a first side of the lower rail, a lower rail-negative electrode terminal is interposed between the structural reinforcement layer of the outermost upper layer of the lower rail and the fourth current collecting layer; and

on a second side of the lower rail, a lower rail-positive electrode terminal is interposed between the structural reinforcement layer of the outermost lower layer of the lower rail and the fifth current collecting layer.

19 . The vehicle of claim 18 , wherein:

on a first side of the upper rail, an upper rail-positive electrode terminal is interposed between the structural reinforcement layer of the outermost upper layer of the upper rail and the first current collecting layer; and

on a second side of the upper rail, an upper rail-negative electrode terminal is interposed between the structural reinforcement layer of the outermost lower layer of the upper rail and the third current collecting layer.

20 . The vehicle of claim 19 , wherein the structural reinforcement layer of the upper rail and the structural reinforcement layer of the lower rail are adhesively bonded with each other by a structural adhesive.