WO2017154071A1

WO2017154071A1 - Battery device

Info

Publication number: WO2017154071A1
Application number: PCT/JP2016/056972
Authority: WO
Inventors: 中濱　敬文; 小林　武則
Original assignee: 株式会社東芝
Priority date: 2016-03-07
Filing date: 2016-03-07
Publication date: 2017-09-14
Also published as: JP6542462B2; JPWO2017154071A1

Abstract

A battery device according to an embodiment of the present invention comprises a plurality of batteries, a battery case, a terminal case, a first ventilation duct, and a second ventilation duct. The battery main bodies of the plurality of batteries each comprise a first surface having the widest surface area among the surfaces of said battery main bodies and a second surface having a narrower surface area than the first surface. The battery main bodies of the plurality of batteries are accommodated in the battery case. The terminal case covers gaps formed between the first surfaces of adjacent battery main bodies from one direction. The first ventilation duct extends substantially parallel to the first surfaces at a position on the opposite side from the terminal case with respect to the battery case and communicates with the interior of the battery case from the opposite side from the terminal case. The second ventilation duct extends substantially parallel to the second surfaces and communicates with the interior of the battery case.

Description

Battery device

Embodiments of the present invention relate to a battery device.

A battery device including a plurality of batteries and a case containing a plurality of batteries is known.
Such a battery device is desired to have improved cooling performance.

Japanese Unexamined Patent Publication No. 2002-141114 Japanese Unexamined Patent Publication No. 2013-187010

The problem to be solved by the present invention is to provide a battery device capable of improving the cooling performance.

The battery device of the embodiment includes a plurality of batteries, an electrical connection portion, a battery case, a terminal portion case, a first ventilation duct, and a second ventilation duct. Each of the plurality of batteries has a flat rectangular parallelepiped battery body and a terminal provided at one end of the battery body. The battery body has a first surface having the largest area among the surfaces of the battery body, and a second surface having a smaller area than the first surface. The plurality of batteries are arranged with the first surfaces facing each other with a gap between the first surfaces of the battery bodies adjacent to each other. The electrical connection portion electrically connects the terminals of the plurality of batteries. The battery case houses battery bodies of the plurality of batteries. The terminal case is combined with the battery case, accommodates the electrical connection portion, and covers the gap formed between the first surfaces of the battery bodies adjacent to each other from one side. The first ventilation duct extends substantially parallel to the first surface of the battery body at a position opposite to the terminal case with respect to the battery case, and the battery case from the opposite side to the terminal case. It communicates with the inside. The second ventilation duct extends substantially parallel to the second surface of the battery body and communicates with the inside of the battery case from a direction different from the direction in which the battery case and the terminal case are arranged.

The perspective view which shows the battery apparatus of 1st Embodiment. The perspective view which shows the battery of 1st Embodiment. Sectional drawing which shows the battery apparatus of 1st Embodiment. Sectional drawing which shows the battery apparatus of 2nd Embodiment. Sectional drawing which shows the battery apparatus of 3rd Embodiment. Sectional drawing which shows the battery apparatus of 4th Embodiment. Sectional drawing which shows the battery apparatus of 5th Embodiment. Sectional drawing which shows the battery apparatus of 6th Embodiment. Sectional drawing which shows the battery apparatus of 7th Embodiment. Sectional drawing which shows the battery apparatus of 8th Embodiment. The graph which shows the relationship between the channel height ratio Rh of the channel height of the exhaust main duct part with respect to the channel height of an intake main duct part, and cooling performance. Sectional drawing which shows the modification of the battery apparatus of embodiment.

Hereinafter, the battery device of the embodiment will be described with reference to the drawings. In the following description, components having substantially the same or similar functions are denoted by the same reference numerals. And the description which overlaps those structures may be abbreviate | omitted.

(First embodiment)
First, a first embodiment will be described with reference to FIGS. 1 to 3.
FIG. 1 is a perspective view showing the battery device 1 of the first embodiment.
As shown in FIG. 1, the battery device 1 of the present embodiment is a device that includes a plurality of batteries (battery cells) 21 and a cooling structure that cools the plurality of batteries 21. The battery device 1 may be referred to as, for example, “storage battery device”, “assembled battery device”, “battery cooling device”, and the like. The battery device 1 is installed in various devices, machines, facilities, and the like, and is used as a power source for these various devices, machines, facilities, and the like. For example, the battery device 1 may be used as a mobile power source such as a power source mounted on an automobile, or may be used as a fixed power source such as a POS (Point Of Sales) system power source. .

As shown in FIG. 1, the battery device 1 of this embodiment includes a battery module (battery pack) 11, an intake duct 12, and an exhaust duct 13.

First, the battery module 11 will be described.
The battery module 11 of the present embodiment includes a plurality of batteries (battery cells) 21, a plurality of bus bars 22 (see FIG. 3), a substrate 23 (see FIG. 3), a battery case 24, and a terminal portion case 25. Have.

Each of the plurality of batteries 21 is, for example, a lithium ion secondary battery. Instead of this, the battery 21 may be another secondary battery such as a nickel metal hydride battery, a nickel cadmium battery, or a lead storage battery.
FIG. 2 is a perspective view showing the battery 21 of the present embodiment.
As shown in FIG. 2, each battery 21 includes a battery main body 31 and a pair of terminals 32 A and 32 B.

The battery body 31 has a case C that forms the outer shape of the battery body 31. In the case C, the positive electrode, the negative electrode, the insulating film, the electrolyte, and the like, which are components of the battery 21, are accommodated. Case C is formed in a flat rectangular parallelepiped shape. In other words, the battery main body 31 (battery 21) is formed in a flat rectangular parallelepiped shape.

Specifically, the battery body 31 has an upper surface 31a, a lower surface 31b, a pair of first side surfaces 31c, and a pair of second side surfaces 31d. A pair of

terminals

32A and 32B are provided on the upper surface 31a. The lower surface 31b is located on the opposite side to the upper surface 31a. The pair of first side surfaces 31c and the pair of second side surfaces 31d extend in a direction substantially orthogonal to the upper surface 31a and the lower surface 31b, and connect the edge of the upper surface 31a and the edge of the lower surface 31b. In other words, the pair of first side surfaces 31c and the pair of second side surfaces 31d are side surfaces that connect the upper end portion (first end portion) of the case C and the lower end portion (second end portion) of the case C. The pair of first side surfaces 31c are substantially parallel to each other. Each of the pair of first side surfaces 31 c is a surface having the largest area among the surfaces of the battery body 31. Each of the pair of first side surfaces 31c is an example of a “first surface (main surface)”. On the other hand, the pair of second side surfaces 31d extends in a direction substantially orthogonal to the first side surface 31c, and connects the edges of the pair of first side surfaces 31c. The pair of second side surfaces 31d are substantially parallel to each other. The second side surface 31d has a smaller area than the first side surface 31c. Each of the pair of second side surfaces 31d is an example of a “second surface”. Further, the upper surface 31a may be referred to as a “third surface”.

The pair of

terminals

32A and 32B are provided at one end (upper end) of the battery body 31. The pair of

terminals

32A and 32B includes a positive terminal 32A and a negative terminal 32B. The positive terminal 32 A is electrically connected to the positive electrode in the case C. The negative terminal 32B is electrically connected to the negative electrode in the case C.

As shown in FIG. 1, the plurality of batteries 21 are arranged substantially parallel to each other, for example, with a pair of terminals 32 A and 32 B facing in the same direction. The plurality of batteries 21 need not have the

terminals

32A and 32B facing in the same direction. The plurality of batteries 21 may be arranged with the

terminals

32A and 32B facing in different directions (for example, opposite directions).
The plurality of batteries 21 include a plurality (for example, three or more) of batteries 21 arranged in the first row L1 and a plurality of (for example, three or more) batteries 21 arranged in the second row L2. The plurality of batteries 21 included in the first row L1 are arranged with the first side surfaces 31c facing each other with a gap g between the first side surfaces 31c. Similarly, the plurality of batteries 21 included in the second row L2 are arranged with the first side surfaces 31c facing each other with a gap g between the first side surfaces 31c. The gap g formed between the plurality of batteries 21 included in the first row L1 is connected to the gap g formed between the plurality of batteries 21 included in the second row L2. On the other hand, the plurality of batteries 21 included in the first row L1 and the plurality of batteries 21 included in the second row L2 are spaced apart from each other or provided with an insulator therebetween, and the second side surface. 31d is arranged facing each other.

Here, on the inner surface of the battery case 24 or the like, a protrusion or the like inserted between the plurality of batteries 21 is provided. The plurality of batteries 21 are held in a state in which a gap g is left between them by a protrusion provided on the battery case 24. Hereinafter, for convenience of explanation, the gap g formed between the plurality of batteries 21 is referred to as “ventilating gap g”. The ventilation gap g is a fluid path (fluid flow part) extending along the first side surface 31 a of the battery body 31.

Here, the + X direction, -X direction, Y direction, and Z direction are defined. The + X direction is a direction from the first row L1 toward the second row L2. The −X direction is the opposite direction to the + X direction. The Y direction is a direction in which the plurality of batteries 21 are arranged with the first side surfaces 31c facing each other. The Z direction is a direction from the lower surface 31b of the battery body 31 toward the upper surface 31a. The + X direction (−X direction), the Y direction, and the Z direction intersect with each other (for example, substantially orthogonal). The Z direction is an example of a “first direction”. The + X direction is an example of a “second direction”. The upper surface 31a and the lower surface 31b of each battery 21 are surfaces along the + X direction and the Y direction. The first side surface 31c of each battery 21 is a surface along the + X direction and the Z direction. The second side surface 31d of each battery 21 is a surface along the Y direction and the Z direction.

FIG. 3 is a cross-sectional view showing the internal configuration of the battery device 1 of the present embodiment.
As shown in FIG. 3, the plurality of bus bars 22 are connected to the terminals 32 A and 32 B of the plurality of batteries 21. The plurality of bus bars 22 is an example of an “electrical connection part”. The plurality of bus bars 22 electrically connect the terminals 32 A and 32 B of the plurality of batteries 21. For example, the bus bar 22 electrically connects the positive terminal 32 A of one battery 21 and the negative terminal 32 B of another battery 21. Thereby, the plurality of batteries 21 are electrically connected in series or in parallel.

The board (circuit board) 23 is a monitoring board for monitoring the voltage and temperature of the battery 21, for example. In addition, the board | substrate 23 may be a control board which controls charging / discharging of the battery 21, and may be a board | substrate which has another function.

Next, the battery case 24 will be described.
As shown in FIGS. 1 and 3, the battery case (battery box, first case) 24 is formed in a box shape in which one side is opened, and a plurality of batteries 21 included in the first row L1 and the second row L2. The battery main body 31 is accommodated integrally. The battery case 24 has a lower wall 24a, a first side wall 24b, a second side wall 24c, a third side wall 24d, and a fourth side wall 24e. The lower wall 24a is a wall along the + X direction and the Y direction. The lower wall 24 a faces the lower surfaces 31 b of the plurality of batteries 21. The four

side walls

24b, 24c, 24d, 24e extend in the Z direction from the edge of the lower wall 24a. The first side wall 24b and the second side wall 24c are separated from each other in the + X direction and extend substantially parallel to each other along the Y direction. The first side wall 24b faces the second side surface 31d of the plurality of batteries 21 included in the first row L1. The second side wall 24c is located on the opposite side of the plurality of batteries 21 from the first side wall 24b. The second side wall 24c faces the second side surface 31d of the plurality of batteries 21 included in the second row L2. The third side wall 24d and the fourth side wall 24e are separated from each other in the Y direction and extend substantially parallel to each other along the + X direction. The third side wall 24d and the fourth side wall 24e face the first side surfaces 31c of the plurality of batteries 21 included in the first row L1 and the second row L2.

As shown in FIG. 3, the lower wall 24a of the battery case 24 has an air inlet 41 facing the ventilation gap g. The intake port 41 is an example of a “ventilator” and a “first vent”. The intake port 41 is open in the Z direction. The intake port 41 is, for example, a rectangular slot along the + X direction. However, the shape of the inlet 41 is not limited to the above example. A plurality of intake ports 41 may be provided for one ventilation gap g, or only one intake port 41 may be provided. On the other hand, the lower wall 24 a of the battery case 24 does not have the air inlet 41 at a position facing the battery 21. That is, the lower surface 31 b of the battery 21 is covered with the lower wall 24 a of the battery case 24.

The second side wall 24c of the battery case 24 has an exhaust port 42 that faces the ventilation gap g. The exhaust port 42 is an example of a “second vent”. The exhaust port 42 opens in the + X direction. The exhaust port 42 is, for example, a rectangular slot along the Z direction. However, the shape of the exhaust port 42 is not limited to the above example. A plurality of exhaust ports 42 may be provided for one ventilation gap g, or only one exhaust port 42 may be provided. On the other hand, the second side wall 24 c of the battery case 24 does not have the exhaust port 42 at a position facing the battery 21. That is, the second side surface 31 d of the battery 21 is covered with the second side wall 24 c of the battery case 24. The

other side walls

24b, 24d, and 24e of the battery case 24 have neither the intake port 41 nor the exhaust port 42.

Next, the terminal part case 25 will be described.
As shown in FIG. 1, the terminal case 25 (terminal box, second case) is combined with the battery case 24 and closes the internal space (accommodating portion) of the battery case 24. Specifically, the terminal case 25 is formed in a flat box shape that is thin in the Z direction. The terminal case 25 has substantially the same outer shape in the + X direction and the Y direction as the battery case 24. The terminal case 25 is attached to the battery case 24 from the side opposite to the lower wall 24 a of the battery case 24 and covers the internal space of the battery case 24. Thereby, the battery case 24 and the terminal part case 25 are located in a line in the Z direction. The terminal case 25 is connected to the battery case 24 by a coupler or an adhesive.

More specifically, the terminal case 25 has an upper wall 25a, a first side wall 25b, a second side wall 25c, a third side wall 25d, a fourth side wall 25e, and a partition wall 25f (see FIG. 3). The upper wall 25a faces away from the battery case 24. The four

side walls

25b, 25c, 25d, and 25e extend along the Z direction from the edge of the upper wall 25a. The first side wall 25b and the second side wall 25c are separated from each other in the + X direction and extend substantially parallel to each other along the Y direction. The third side wall 25d and the fourth side wall 25e are separated from each other in the Y direction and extend substantially parallel to each other along the + X direction.

As shown in FIG. 3, the partition wall (partition plate) 25f of the terminal case 25 is located at the boundary between the battery case 24 and the terminal case 25. The partition wall 25f is a flat wall along the + X direction and the Y direction. The partition wall 25f has a plurality of insertion holes 45 through which the

terminals

32A and 32B of the plurality of batteries 21 are passed. The terminals 32 A and 32 B of the plurality of batteries 21 are passed through the insertion holes 45 of the partition wall 25 f and exposed inside the terminal portion case 25. A plurality of bus bars 22 and a substrate 23 are accommodated inside the terminal case 25. The terminals 32 A and 32 B of the plurality of batteries 21 are electrically connected by a plurality of bus bars 22 accommodated in the terminal portion case 25.

On the other hand, the partition wall 25f does not have a hole at a position facing the ventilation gap g. The partition wall 25f faces a plurality of ventilation gaps g formed between the plurality of batteries 21, and integrally covers the plurality of ventilation gaps g. That is, the partition wall 25f covers the plurality of ventilation gaps g from one side. In other words, the plurality of ventilation gaps g are closed in the Z direction by the partition wall 25f.

Next, the intake duct 12 will be described.
As shown in FIG. 3, the intake duct 12 forms an intake passage that guides a cooling fluid (refrigerant, for example, air) from the outside of the battery module 11 toward the battery module 11. The intake duct 12 is an example of a “first ventilation duct”. More specifically, the intake duct 12 has a first portion 12a and a second portion 12b.

The first portion 12a of the intake duct 12 is provided at a position that does not overlap the battery case 24 in the Z direction. The first portion 12a of the intake duct 12 extends from the outside of the battery case 24 in the direction approaching the battery case 24 along the + X direction. The + X direction is a direction substantially parallel to the first side surface 31c of the battery body 31. Cooling fluid is supplied to the first portion 12a of the intake duct 12 from the outside by an unillustrated intake fan or the like. The cooling fluid supplied to the first portion 12a of the intake duct 12 flows along the + X direction inside the first portion 12a of the intake duct 12.

The second portion 12b of the intake duct 12 is located downstream of the first portion 12a in the flow direction of the cooling fluid in the intake duct 12. The second portion 12b of the intake duct 12 extends along the lower wall 24a of the battery case 24 from the first portion 12a. That is, the second portion 12 b of the intake duct 12 extends in the + X direction at a position opposite to the terminal case 25 with respect to the battery case 24. The second portion 12b of the intake duct 12 extends over substantially the entire length of the battery case 24 in the + X direction. The cooling fluid flows into the second portion 12b of the intake duct 12 from the first portion 12a. The cooling fluid that has flowed into the second portion 12b of the intake duct 12 flows along the + X direction inside the second portion 12b.

As shown in FIG. 3, the second portion 12b of the intake duct 12 overlaps the battery case 24 in the Z direction. The second portion 12 b of the intake duct 12 communicates with the inside of the battery case 24 from the side opposite to the terminal case 25 through the intake port 41 of the battery case 24. For example, the second portion 12b of the intake duct 12 communicates with the inside of the battery case 24 in the Z direction. The second portion 12 b of the intake duct 12 causes the cooling fluid flowing inside the second portion 12 b of the intake duct 12 to flow into the battery case 24 from the intake port 41 of the battery case 24.

As shown in FIG. 3, the width of the intake duct 12 in the Y direction is substantially the same as the width of the battery case 24 in the Y direction. The intake duct 12 overlaps all the ventilation gaps g formed between the plurality of batteries 21 in a plan view viewed along the Z direction.

Next, the exhaust duct 13 will be described.
As shown in FIG. 3, the exhaust duct 13 forms an exhaust passage through which the cooling fluid that has passed through the inside of the battery module 11 flows out. The exhaust duct 13 is an example of a “second ventilation duct”. More specifically, the exhaust duct 13 has a first portion 13a and a second portion 13b.

The first portion 13a of the exhaust duct 13 overlaps the second side wall 24c of the battery case 24 in the -X direction. The first portion 13 a of the exhaust duct 13 extends in the Z direction along the second side wall 24 c of the battery case 24. The Z direction is a direction substantially parallel to the second side surface 31d of the battery body 31. For example, the first portion 13a of the exhaust duct 13 extends over substantially the entire length of the battery case 24 in the Z direction.

The first portion 13 a of the exhaust duct 13 communicates with the inside of the battery case 24 through the exhaust port 42 of the battery case 24. That is, the first portion 13 a of the exhaust duct 13 communicates with the inside of the battery case 24 from a direction different from the direction in which the battery case 24 and the terminal case 25 are arranged. In the present embodiment, the battery case 24 and the exhaust duct 13 communicate with each other in the + X direction. The cooling fluid that has passed through the inside of the battery case 24 flows out from the exhaust port 42 of the battery case 24 to the first portion 13 a of the exhaust duct 13.

The second portion 13b of the exhaust duct 13 is located downstream of the first portion 13a in the flow direction of the cooling fluid in the exhaust duct 13. The second portion 13b of the exhaust duct 13 extends in the Z direction from the first portion 13a. For example, the second portion 13 b of the exhaust duct 13 extends along the second side wall 25 c of the terminal case 25. The cooling fluid flows into the second portion 13b of the exhaust duct 13 from the first portion 13a. The second portion 13 b of the exhaust duct 13 guides the cooling fluid flowing from the first portion 13 a toward the outside of the battery module 11.

As shown in FIG. 3, the width of the exhaust duct 13 in the Y direction is substantially the same as the width of the battery case 24 in the Y direction. The exhaust duct 13 overlaps all the ventilation gaps g formed between the plurality of batteries 21 in a plan view viewed along the + X direction.
In addition, a plurality of energization cables (not shown) are arranged in the exhaust duct 13. The plurality of energization cables are electrically connected to the plurality of batteries 21 via the plurality of bus bars 22. The exhaust duct 13 of the present embodiment is also used as a space for connecting a plurality of energizing cables.

Next, the operation of the battery device 1 will be described.
When the battery device 1 is charged or discharged, a cooling fluid is supplied to the intake duct 12 from the outside of the battery module 11. The cooling fluid supplied to the intake duct 12 flows through the intake duct 12 along the + X direction. The cooling fluid that has flowed inside the intake duct 12 changes its flow direction so as to go toward the inside of the battery case 24 in the second portion 12b of the intake duct 12. Then, the cooling fluid flowing inside the second portion 12 b of the intake duct 12 flows into the ventilation gap g between the plurality of batteries 21 from the intake port 41 of the battery case 24. The cooling fluid that has flowed into the ventilation gap g takes heat away from the battery 21 by directly contacting the first side surface 31c of the battery 21 in the process of passing through the ventilation gap g. Thereby, cooling of the some battery 21 is accelerated | stimulated. Further, the cooling fluid that has flowed into the ventilation gap g changes its flow direction toward the exhaust duct 13 while passing through the ventilation gap g. And the cooling fluid which passed the ventilation gap g flows in into the 1st part 13a of the exhaust duct 13 from the exhaust port 42 of the battery case 24. FIG. The cooling fluid that has flowed into the first portion 13 a of the exhaust duct 13 changes the flow direction toward the second portion 13 b of the exhaust duct 13 in the first portion 13 a of the exhaust duct 13, and toward the outside of the battery module 11. Flowing.

According to the above configuration, the cooling performance of the battery device 1 can be improved. That is, in the present embodiment, the intake duct 12 extends substantially parallel to the first side surface 31c (the surface having the largest area) of the battery body 31 at a position opposite to the terminal case 25 with respect to the battery case 24, The battery case 24 communicates with the inside of the battery case 24 from the side opposite to the terminal case 25. According to such a configuration, the cooling fluid flowing in the intake duct 12 flows in the direction of flowing toward the inside of the battery case 24 in a relatively wide range (region) along the first side surface 31 c of the battery body 31. Can be changed. For this reason, as compared with the case where the intake duct 12 is provided along a direction substantially orthogonal to the first side surface 31 c of the battery body 31, the cooling fluid flowing through the intake duct 12 is formed between the plurality of batteries 21. Can smoothly flow into the ventilation gap g. As a result, the flow rate of the cooling fluid from the intake duct 12 toward the inside of the battery case 24 can be increased, and the cooling performance of the battery device 1 can be improved.

Further, when the intake duct 12 extends substantially parallel to the first side surface 31c of the battery body 31, the cooling fluid is evenly supplied to the plurality of batteries 21 arranged with the first side surfaces 31c facing each other. It becomes easy to do. Thereby, the temperature variation in the battery case 24 can be suppressed, and the plurality of batteries 21 can be efficiently cooled. Also from this viewpoint, the cooling performance of the battery device 1 can be improved.

In the present embodiment, the intake duct 12 extends substantially parallel to the first side surface 31 c of the battery body 31. On the other hand, the exhaust duct 13 extends substantially parallel to the second side surface 31 d of the battery body 31. According to such a configuration, both the intake duct 12 and the exhaust duct 13 can be accommodated in a region that is substantially the same as or smaller than the width of the battery case 24 in the Y direction. Thereby, size reduction of the battery apparatus 1 can be achieved. Further, according to the configuration of the present embodiment, even when the plurality of battery devices 1 (battery modules 11) are arranged in the Y direction, the intake duct 12 and the exhaust duct 13 become an obstacle between the plurality of battery devices 1. Hateful. For this reason, the some battery apparatus 1 (battery module 11) can be arrange | positioned densely.

In the present embodiment, the battery case 24 and the terminal case 25 are aligned in the Z direction. The intake duct 12 extends in a + X direction that is substantially parallel to the first side surface 31c of the battery body 31 at a position opposite to the terminal case 25 with respect to the battery case 24 and intersects the Z direction. ing. According to such a structure, it can suppress that the battery apparatus 1 becomes thick compared with the case where the intake duct 12 is extended in the Z direction. Thereby, further size reduction of the battery apparatus 1 can be achieved.

In this embodiment, the battery case 24 and the exhaust duct 13 communicate with each other in the + X direction. According to such a configuration, a part of the cooling fluid flowing into the battery case 24 while having an inertial force component in the + X direction by flowing in the intake duct 12 in the + X direction is exhausted from the inside of the battery case 24. It can flow into the duct 13 in the + X direction. For this reason, the cooling fluid flowing through the intake duct 12 easily flows smoothly into the exhaust duct 13 through the inside of the battery case 24. As a result, the flow rate of the cooling fluid from the intake duct 12 toward the inside of the battery case 24 can be further increased, and the cooling performance of the battery device 1 can be further improved.

In the present embodiment, the intake duct 12 and the battery case 24 are arranged in the Z direction. The exhaust duct 13 extends in the Z direction. According to such a configuration, a part of the cooling fluid flowing into the battery case 24 while having an inertial force component in the Z direction by flowing in the Z direction from the intake duct 12 toward the inside of the battery case 24 is obtained. The exhaust duct 13 can flow in the Z direction. For this reason, it becomes easier for the cooling fluid to flow into the exhaust duct 13 more smoothly from the inside of the battery case 24. As a result, the flow rate of the cooling fluid from the intake duct 12 toward the inside of the battery case 24 can be further increased, and the cooling performance of the battery device 1 can be further improved.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that the exhaust duct 13 has a plurality of

exhaust passages

51 and 52. The configurations other than those described below are the same as the configurations of the first embodiment.

As shown in FIG. 4, the exhaust duct 13 has a first exhaust flow path 51 and a second exhaust flow path 52. The first exhaust flow path 51 and the second exhaust flow path 52 are arranged separately on both sides of the battery case 24 in the + X direction, and communicate with the inside of the battery case 24, respectively. The first exhaust passage 51 is an example of a “first ventilation passage”. The second exhaust passage 52 is an example of a “second ventilation passage”.

More specifically, the battery case 24 of the present embodiment has an exhaust port 42 in the first side wall 24b in addition to the second side wall 24c. That is, the first side wall 24b has an exhaust port 42 that faces the ventilation gap g. The exhaust port 42 of the first side wall 24b opens in the −X direction. The first side wall 24 b does not have the exhaust port 42 at a position facing the battery 21.

The first exhaust passage 51 overlaps the first side wall 24b of the battery case 24 in the + X direction. The first exhaust passage 51 extends in the Z direction along the first side wall 24 b of the battery case 24. The first exhaust passage 51 communicates with the inside of the battery case 24 in the + X direction through the exhaust port 42 of the first side wall 24b of the battery case 24. In other words, the first exhaust passage 51 communicates with the inside of the battery case 24 from a direction different from the direction in which the battery case 24 and the terminal case 25 are arranged. Part of the cooling fluid that has flowed into the battery case 24 flows out from the exhaust port 42 of the first side wall 24 b of the battery case 24 to the first exhaust flow path 51.

On the other hand, the second exhaust flow path 52 overlaps the second side wall 24c of the battery case 24 in the -X direction. The second exhaust flow path 52 extends in the Z direction along the second side wall 24 c of the battery case 24. The second exhaust passage 52 communicates with the inside of the battery case 24 in the −X direction through the exhaust port 42 of the second side wall 24 c of the battery case 24. That is, the second exhaust flow path 52 communicates with the inside of the battery case 24 from a direction different from the direction in which the battery case 24 and the terminal portion case 25 are arranged. The cooling fluid that has flowed into the battery case 24 flows out from the exhaust port 42 of the second side wall 24 c of the battery case 24 to the second exhaust flow path 52.

According to such a configuration, the cooling performance of the battery device 1 can be improved as in the first embodiment. In the present embodiment, the exhaust duct 13 includes a first exhaust passage 51 and a second exhaust passage 52. The first exhaust flow path 51 and the second exhaust flow path 52 are arranged separately on both sides of the battery case 24 in the + X direction, and communicate with the inside of the battery case 24, respectively. According to such a structure, the ventilation cross-sectional area of the exhaust duct 13 can be increased. The “ventilation cross-sectional area” referred to in the present application is a cross-sectional area along a direction substantially orthogonal to the flow direction of the cooling fluid, and means a flow path cross-sectional area through which the cooling fluid flows. When the ventilation cross-sectional area of the exhaust duct 13 increases, the ventilation resistance of the exhaust duct 13 can be reduced. Thereby, the quantity of the cooling fluid which flows into the ventilation gap g can be increased, and the cooling performance of the battery device 1 can be further improved.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. This embodiment is different from the second embodiment in that the first exhaust flow path 51 and the second exhaust flow path 52 are provided so as to bypass the terminal portion case 25. The configurations other than those described below are the same as the configurations of the second embodiment.

As shown in FIG. 5, each of the first exhaust passage 51 and the second exhaust passage 52 has a third portion 13c (extension portion) in addition to the first portion 13a and the second portion 13b described above. The third portion 13 c is located on the downstream side of the second portion 13 b in the flow direction of the cooling fluid in the exhaust duct 13.

The third portion 13 c of the first exhaust flow path 51 extends in the + X direction along the upper wall 25 a of the terminal case 25 from the end of the second portion 13 b of the first exhaust flow path 51. On the other hand, the third portion 13 c of the second exhaust passage 52 extends in the −X direction along the upper wall 25 a of the terminal case 25 from the end of the second portion 13 b of the second exhaust passage 52. The third portions 13 c of the first exhaust flow path 51 and the second exhaust flow path 52 are located on the opposite side of the battery case 24 with respect to the terminal case 25. The cooling fluid that has passed through the second portion 13b flows into the third portion 13c. The cooling fluid that has flowed into the third portion 13 c flows inside the third portion 13 c along the upper wall 25 a of the terminal portion case 25. For example, the third portion 13 c of each of the first exhaust flow channel 51 and the second exhaust flow channel 52 is formed in a cylindrical shape in which one surface facing the terminal case 25 is opened. For this reason, the cooling fluid flowing through the third portion 13 c directly contacts the upper wall 25 a of the terminal portion case 25.

In the present embodiment, the first exhaust flow channel 51 and the second exhaust flow channel 52 merge with each other at the substantially central portion of the battery case 24 in the + X direction. An outlet 62 of the exhaust duct 13 that opens in the Z direction is provided at a junction between the first exhaust flow path 51 and the second exhaust flow path 52.

According to such a configuration, as in the second embodiment, the cooling performance of the battery device 1 can be improved. In the present embodiment, the exhaust duct 13 has a third portion 13 c (extension portion) through which wind flows along the terminal portion case 25. According to such a configuration, the terminal case 25 is directly cooled by the cooling fluid flowing through the third portion 13 c of the exhaust duct 13. Thereby, heat dissipation of components (such as the bus bar 22 and the substrate 23) accommodated in the terminal case 25, the terminals 32 A and 32 B of the battery 21, and the upper part of the battery main body 31 can be further promoted. Thereby, the cooling performance of the battery device 1 can be further improved.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. This embodiment is different from the third embodiment in that the first exhaust passage 51 extends longer than the second exhaust passage 52. The configurations other than those described below are the same as the configurations of the third embodiment.

As shown in FIG. 6, in the present embodiment, the second exhaust flow path 52 does not have the third portion 13c. On the other hand, the third portion 13c of the first exhaust passage 51 is provided over substantially the entire length of the terminal case 25 in the + X direction. The third portion 13 c of the first exhaust passage 51 joins the second portion 13 b of the second exhaust passage 52.

According to such a configuration, as in the third embodiment, the cooling performance of the battery device 1 can be improved. In the present embodiment, the first exhaust flow path 51 has a third portion 13 c (extension part) that flows along the terminal part case 25 and merges with the second exhaust flow path 52. According to such a configuration, the outlets of the first exhaust passage 51 and the second exhaust passage 52 are gathered at one end of the battery case 24. For this reason, for example, it becomes easy to arrange a plurality of battery devices 1 in multiple stages in the Z direction (see FIG. 9).

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIG. This embodiment is different from the fourth embodiment in that the terminal part case 25 has an opening 65a through which a cooling fluid flows. The configuration other than that described below is the same as the configuration of the fourth embodiment.

As illustrated in FIG. 7, the terminal case 25 has a first opening 65a and a second opening 65b. The first opening 65 a is provided in the first side wall 25 b of the terminal case 25 and opens (communicates) inside the first exhaust flow path 51. The first opening 65 a allows a part of the cooling fluid flowing inside the first exhaust passage 51 to flow into the terminal case 25.
On the other hand, the second opening 65 b is provided in the second side wall 25 c of the terminal case 25 and opens (communicates) inside the second exhaust passage 52. The second opening 65 b flows from the first opening 65 a into the terminal case 25 and allows the cooling fluid that has passed through the terminal case 25 to flow into the second exhaust flow path 52.

According to such a configuration, the cooling performance of the battery device 1 can be improved as in the fourth embodiment. In the present embodiment, the terminal case 25 has an opening 65 a through which a part of the wind flowing in the exhaust duct 13 flows into the terminal case 25. According to such a configuration, a part of the cooling fluid flowing through the exhaust duct 13 flows through the inside of the terminal portion case 25, so that the components (for example, the bus bar 22 and the substrate 23) housed in the terminal portion case 25, the battery The heat radiation of the

terminals

32A and 32B of the 21 and the upper part of the battery body 31 can be further promoted. Thereby, the cooling performance of the battery device 1 can be further improved.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIG. This embodiment is different from the fourth embodiment in that the plurality of batteries 21 are arranged in three rows and the opening ratio of the air inlet 41 is different depending on the region of the lower wall 24a of the battery case 24. . The configuration other than that described below is the same as the configuration of the fourth embodiment.

As shown in FIG. 8, the plurality of batteries 21 are arranged in a first row L1, a second row L2, and a third row L3. The third row L3 is located on the opposite side to the second row L2 with respect to the first row L1.

Each of the first column L1, the second column L2, and the third column L3 includes a plurality of (for example, three or more) batteries 21. In each of the first row L1, the second row L2, and the third row L3, the plurality of batteries 21 face each other in the Y direction with a gap g between the first side surfaces 31c. Are arranged. The plurality of batteries 21 included in the first row L1, the plurality of batteries 21 included in the second row L2, and the plurality of batteries 21 included in the third row L3 are spaced from each other in the + X direction. The second side surfaces 31d are arranged to face each other with a gap between them or an insulator.

From another viewpoint, the second row L2 and the third row L3 are located at the ends of the plurality of rows L1, L2, and L3. The second row L2 is closest to the second exhaust passage 52 (exhaust duct 13) among the plurality of rows L1, L2, and L3. Similarly, the third row L3 is closest to the first exhaust passage 51 (exhaust duct 13) among the plurality of rows L1, L2, and L3. On the other hand, the first row L1 is located between the second row L2 and the third row L3, and is sandwiched from both sides by the second row L2 and the third row L3. The first row L1 is farther from the exhaust duct 13 than the second row L2 and the third row L3.

In the present embodiment, the lower wall 24a of the battery case 24 includes a first region 71, a second region 72, and a third region 73. The first area 71 is an area in which the plurality of batteries 21 included in the first row L1 are arranged. The second area 72 is an area where the plurality of batteries 21 included in the second row L2 are arranged. The third area 73 is an area in which the plurality of batteries 21 included in the third row L3 are arranged. The second region 72 and the third region 73 are closer to the exhaust port 42 (exhaust duct 13) than the first region 71.

The first region 71, the second region 72, and the third region 73 each have at least one intake port 41. The opening ratio of the intake port 41 in the second region 72 and the third region is smaller than the opening rate of the intake port 41 in the first region 71. The “opening ratio” in the present application means the ratio of the opening area of the intake port 41 to the area (total area) of a certain region. That is, for example, “the opening ratio of the intake port 41 in the first region 71” means the opening area of the intake port 41 provided in the first region 71 (if a plurality of intake ports 41 are provided, This is a value obtained by dividing the total opening area of the intake port 41 by the area of the first region 71.

For example, in the present embodiment, the second region 72 and the third region 73 are provided with a plurality of intake ports 41 at predetermined intervals. On the other hand, the first region 71 is provided with a relatively large intake port 41 over the entire length of the first region 71 in the + X direction. Thereby, the opening ratio of the intake port 41 in the second region 72 and the third region 73 is smaller than the opening rate of the intake port 41 in the first region 71.

According to such a configuration, it is possible to improve the cooling performance of the battery device 1 as in the fourth embodiment.
Here, the plurality of batteries 21 included in the first row L1 are relatively far from the exhaust port 42 (exhaust duct 13). For this reason, the plurality of batteries 21 included in the first row L1 are less likely to be exposed to the cooling fluid and are less likely to be cooled than the plurality of batteries 21 included in the second row L2 and the third row L3. For this reason, temperature variation may occur in the battery case 24, and cooling performance may deteriorate.

However, in the present embodiment, the opening ratio of the intake port 41 in the second region 72 and the third region 73 is smaller than the opening rate of the intake port 41 in the first region 71. According to such a configuration, the flow rate of air flowing into the battery case 24 from the air inlet 41 of the first region 71 can be increased. Thereby, cooling of the some battery 21 contained in the 1st row | line L1 comparatively far from the exhaust port 42 (exhaust duct 13) can be accelerated | stimulated effectively. As a result, it is possible to suppress temperature variations in the battery case 24 and improve the cooling performance of the battery device 1. Moreover, the lifetime of each battery 21 can be improved by suppressing the temperature variation of the plurality of batteries 21.

(Seventh embodiment)
Next, a seventh embodiment will be described with reference to FIG. This embodiment is different from the fourth embodiment in that a plurality of battery modules 11 are arranged in multiple stages. The configuration other than that described below is the same as the configuration of the fourth embodiment.

As shown in FIG. 9, the battery device 1 of this embodiment includes a plurality of battery modules 11, an intake duct 12, an exhaust duct 13, and a fan 81. Each of the plurality of battery modules 11 includes a plurality of batteries 21, a plurality of bus bars 22, a substrate 23, a battery case 24, and a terminal part case 25. The plurality of battery modules 11 are arranged in multiple stages in the Z direction, which is the direction in which the battery case 24 and the terminal case 25 are arranged.

The intake duct 12 has an intake main duct portion 91 and a plurality of intake passages 92. The intake main duct portion 91 extends in a direction (Z direction) in which the plurality of battery modules 11 are arranged in multiple stages. The intake main duct portion 91 extends over the plurality of battery modules 11 so as to be located on all sides of the plurality of battery modules 11. The intake main duct portion 91 is a flow path through which the cooling fluid supplied to the plurality of battery modules 11 flows. The intake main duct portion 91 has an inlet 61 that opens to the outside of the battery device 1 at one end portion (for example, an upper end portion) of the battery device 1. The cooling fluid flows into the intake main duct portion 91 from the outside of the battery device 1 through the inlet 61.

The plurality of intake channels 92 are provided corresponding to the plurality of battery modules 11. Each intake channel 92 is an example of a “ventilating channel”. The plurality of intake passages 92 are branched from the intake main duct portion 91. The cooling fluid flowing in the intake main duct portion 91 flows into the plurality of intake flow paths 92, respectively. Each of the plurality of intake flow paths 92 is substantially the same as the first side surface 31c of the battery body 31 at a position opposite to the terminal case 25 with respect to the battery case 24 with respect to the battery module 11 to which the intake flow path 92 corresponds. It extends in parallel and communicates with the inside of the battery case 24 from the side opposite to the terminal case 25. In the present embodiment, each intake flow channel 92 includes a first portion 12a and a second portion 12b, as in the first embodiment. Accordingly, the plurality of intake passages 92 supply the cooling fluid to the inside of the battery cases 24 of the plurality of battery modules 11.

The exhaust duct 13 has an exhaust main duct portion 95 and a plurality of exhaust passages 51. The exhaust main duct portion 95 is located on the side opposite to the intake main duct portion 91 with respect to the plurality of battery modules 11. The exhaust main duct portion 95 extends in a direction (Z direction) in which the plurality of battery modules 11 are arranged in multiple stages. The exhaust main duct portion 95 extends over the plurality of battery modules 11 so as to be positioned on all sides of the plurality of battery modules 11. The exhaust main duct portion 95 is a flow path in which cooling fluids that have passed through the plurality of battery modules 11 merge. The exhaust main duct portion 95 has an outlet 62 opened to the outside of the battery device 1 at one end portion (for example, an upper end portion) of the battery device 1. The exhaust main duct 95 causes the air that has passed through the inside of the battery cases 24 of the plurality of battery modules 11 to flow out of the battery device 1 from the outlet 62. The plurality of exhaust passages 51 are provided corresponding to the plurality of battery modules 11 and are connected to the exhaust main duct portion 95.

In this embodiment, the fan 81 is provided at the outlet 62 of the exhaust duct 13 as an exhaust fan. When the fan 81 is driven, the cooling fluid in the exhaust duct 13 is exhausted to the outside of the battery device 1. As a result, the pressure inside the battery device 1 decreases, and a new cooling fluid flows into the intake duct 12 from the outside of the battery device 1. The place where the fan 81 is provided is not limited to the outlet 62 of the exhaust duct 13 but may be in the middle of the exhaust duct 13.

According to such a configuration, it is possible to improve the cooling performance of the battery device 1 as in the fourth embodiment.
In the present embodiment, the plurality of battery modules 11 are arranged in multiple stages in the Z direction. The intake duct 12 has a plurality of intake passages 92 provided corresponding to the plurality of battery modules 11. Each of the plurality of intake passages 92 extends substantially parallel to the first side surface 31 c of the battery body 31 and communicates with the inside of the battery case 24 from the side opposite to the terminal portion case 25. According to such a configuration, the plurality of battery modules 11 can be arranged densely. Thereby, size reduction of the battery apparatus 1 provided with the some battery module 11 can be achieved.

(Eighth embodiment)
Next, an eighth embodiment will be described with reference to FIG. This embodiment is different from the seventh embodiment in that the fan 81 is provided in the intake duct 12. The configuration other than that described below is the same as the configuration of the seventh embodiment.

As shown in FIG. 10, in this embodiment, the fan 81 is provided at the inlet 61 of the intake duct 12 as an air supply fan. The fan 81 is cooled toward the battery module 11 (the lowermost battery module 11 in the present embodiment) farthest from the inlet 61 of the intake duct 12 among the plurality of battery modules 11 arranged in multiple stages along the Z direction. Force the fluid. The place where the fan 81 is provided is not limited to the inlet 61 of the intake duct 12 but may be in the middle of the intake duct 12.

Next, the relationship between the ventilation cross section of the intake duct 12 and the ventilation cross section of the exhaust duct 13 will be described. As shown in FIG. 10, in the present embodiment, the flow path height Ho of the exhaust main duct portion 95 is set to be approximately 0.5 times or more the flow path height Hi of the intake main duct 91. The “flow path height” referred to in the present application means the duct width in the direction substantially orthogonal to the flow direction of the cooling fluid (in this embodiment, the duct width in the + X direction). Here, in the present embodiment, the width of the intake main duct portion 91 in the paper surface depth direction (Y direction) in FIG. 10 is substantially the same as the width of the exhaust main duct portion 95 in the paper surface depth direction. In other words, the ventilation cross-sectional area of the exhaust main duct portion 95 is approximately 0.5 times or more the ventilation cross-sectional area of the intake main duct portion 91. In the present embodiment, the ventilation cross-sectional area (or flow path height Hi) of the intake main duct portion 91 and the ventilation cross-sectional area (or flow path height Ho) of the exhaust main duct portion 95 are constant in the Z direction.

FIG. 11 shows a flow path height ratio Rh (= Ho / Hi) between the flow path height Hi of the intake main duct section 91 and the flow path height Ho of the exhaust main duct section 95 obtained by experiments by the inventors of the present application. ) And the cooling performance. The “maximum temperature rise” in the graph is a temperature rise relative to the intake air temperature of the battery 21 having the highest temperature among the batteries 21 included in the plurality of battery modules 11 arranged in multiple stages. The “minimum temperature rise” is a temperature rise relative to the intake air temperature of the battery 21 having the lowest temperature among the batteries 21 included in the plurality of battery modules 11 arranged in multiple stages. The “temperature rise variation” is the difference between the “maximum temperature rise” and the “minimum temperature rise”. The experiment is based on a model in which a uniform cooling fluid flows from the inlet 61 of the intake main duct portion 91 (for example, when the fan 81 is installed) and the outlet 62 of the exhaust duct 92 is opened to the atmosphere. Was done.

As shown in FIG. 11, in a region where the flow path height Ho of the exhaust main duct portion 95 is approximately 0.5 times or more the flow path height Hi of the intake main duct portion 91, the temperature of the battery 21 rises (for example, a plurality of The maximum temperature rise in the battery 21) is relatively small. Further, in the region where the flow passage height Ho of the exhaust main duct portion 95 is approximately 0.5 times or more the flow passage height Hi of the intake main duct portion 91, the flow passage height ratio Rh (= Ho / Hi) is large. Even when the flow path height Ho of the exhaust main duct portion 95 is further increased, the temperature rise of the battery 21 (for example, the maximum temperature rise in the plurality of batteries 21) hardly changes.

On the other hand, in the region where the flow passage height Ho of the exhaust main duct portion 95 is less than about 0.5 times the flow passage height Hi of the intake main duct portion 91, the maximum temperature rise in the plurality of batteries 21 becomes large. The minimum temperature rise in the battery 21 becomes smaller, and the difference in temperature rise (temperature variation) among the plurality of batteries 21 suddenly increases.

According to such a configuration, as in the seventh embodiment, the cooling performance of the battery device 1 can be improved.
In the present embodiment, the cooling fluid is forcibly sent by the fan 81 toward the battery module 11 farthest from the inlet 61 of the intake duct 12 among the plurality of battery modules 11 arranged in multiple stages. According to such a configuration, the cooling performance of the battery device 1 can be further improved.

Here, when the ventilation cross-sectional area of the exhaust main duct portion 95 is less than about 0.5 times the ventilation cross-sectional area of the intake main duct portion 91, the difference in temperature rise (temperature) of the plurality of batteries 21 as described above. (Variation) may increase suddenly. In this case, the life of the battery 21 having a large maximum temperature rise is shortened. For this reason, it is necessary to replace the battery module 11 and the battery device 1 despite the presence of the battery 21 whose temperature rise is relatively small and still has a life remaining. For this reason, the maintenance interval of the battery system such as replacement of the battery 21 is shortened.

Therefore, in this embodiment, the ventilation cross-sectional area of the exhaust main duct portion 95 is set to a size that is approximately 0.5 times or more the ventilation cross-sectional area of the intake main duct portion 91. According to such a configuration, the maximum temperature rise in the plurality of batteries 21 is reduced, and the maintenance interval of the battery system such as replacement of the batteries 21 can be extended. Further, the ventilation cross-sectional area of the exhaust main duct portion 95 is approximately 0.5 times as large as the ventilation cross-sectional area of the intake main duct portion 91 (or approximately 0.5 times or more and less than 1.0 times). When set, the electronic device 1 can be downsized.

(Modification of the embodiment)
Next, with reference to FIG. 12, the modification of the battery apparatus 1 of embodiment is demonstrated. This modification is applicable to the first, fourth, fifth, seventh, and eighth embodiments. In FIG. 12, an example applied to the configuration of the first embodiment will be described.

As shown in FIG. 12, the lower wall 24 a of the battery case 24 has a first region 71 and a second region 72. The first area 71 is an area in which the plurality of batteries 21 included in the first row L1 are arranged. On the other hand, the second area 72 is an area in which the plurality of batteries 21 included in the second row L2 are arranged. The second region 72 is closer to the exhaust port 42 (exhaust duct 13) than the first region 71.

The first region 71 and the second region 72 each have at least one intake port 41. The opening ratio of the intake port 41 in the second region 72 is smaller than the opening rate of the intake port 41 in the first region 71.

For example, in the present embodiment, the individual opening areas of the intake ports 41 provided in the first region 71 are larger than the individual opening areas of the intake ports 41 provided in the second region 72, so that in the second region 72 The opening ratio of the intake port 41 is smaller than the opening ratio of the intake port 41 in the first region 71. Instead, since the number of intake ports 41 provided in the first region 71 is larger than the number of intake ports 41 provided in the second region 72, the opening ratio of the intake ports 41 in the second region 72 is increased. The opening ratio of the intake port 41 in the first region 71 may be smaller. For example, in the present embodiment, the opening areas of the plurality of intake ports 41 provided in the first region 71 and the second region 72 are gradually increased as the intake ports 41 are further away from the exhaust port 42 (exhaust duct 13). It has become.

According to such a configuration, similarly to the sixth embodiment, cooling of the plurality of batteries 21 included in the first row L1 that is relatively far from the exhaust port 42 (exhaust duct 13) can be promoted. Thereby, it is possible to suppress the temperature variation in the battery case 24 and to improve the cooling performance of the battery device 1. Moreover, if the temperature variation of the some battery 21 can be suppressed, the improvement of the lifetime of each battery 21 can be aimed at.

Further, by applying the configuration of this modification to the fourth, fifth, seventh, and eighth embodiments, the amount of cooling fluid flowing along the surface of the terminal case 25 and the amount of the terminal case 25 The amount of cooling fluid flowing inside can be increased. As a result, the cooling performance of the battery device 1 can be further improved.

As mentioned above, although the battery apparatus 1 which concerns on some embodiment and modification was demonstrated, the structure of embodiment is not limited to the said example. For example, the configurations of the first to eighth embodiments described above may be applied in combination with each other. In the configuration of the above embodiment, the flow direction of intake / exhaust air may be reversed. That is, the first ventilation port provided on the lower wall 24a of the battery case 24 may be an exhaust port, and the second ventilation port provided on the side wall 24b of the battery case 24 may be an exhaust port. Further, the first ventilation duct that communicates with the inside of the battery case 24 in the Z direction may be an exhaust duct, and the second ventilation duct that communicates with the interior of the battery case 24 in the −X direction may be an intake duct. The fan 81 may be provided in both the intake duct 12 and the exhaust duct 13. Lower wall 24a of battery case 24, first to

fourth side walls

24b, 24c, 24d, 24e, upper wall 25a of terminal case 25, first to

fourth side walls

25b, 25c, 25d, 25e, and partition walls The name 25f is given for convenience of explanation. Therefore, these walls may be referred to as “first wall”, “second wall”, “third wall”,.

According to at least one embodiment described above, the battery body of the battery has a first surface having the largest area among the surfaces of the battery body, and a second surface having a smaller area than the first surface. . The plurality of batteries are arranged with a gap between first surfaces of adjacent battery bodies. The battery case houses battery bodies of the plurality of batteries. The terminal case covers the gap between the first surfaces of the battery bodies adjacent to each other from one side. The air intake duct extends substantially parallel to the first surface of the battery body at a position opposite to the terminal case with respect to the battery case, and enters the inside of the battery case from the side opposite to the terminal case. Communicate. According to such a configuration, the cooling performance of the battery device can be improved.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Battery device, 11 ... Battery module, 12 ... Intake duct (1st ventilation duct), 13 ... Exhaust duct (2nd ventilation duct), 21 ... Battery, 22 ... Bus bar (electrical connection part), 24 ... Battery case, 25 ... Terminal part case, 25a ... Opening of terminal part case, 31 ... Battery body, 31c ... First side surface (first surface), 31d ... Second side surface (second surface), 32A, 32B ... Terminal, 41 ... Intake port (ventilation port), 42 ... exhaust port, 51 ... first exhaust channel, 52 ... second exhaust channel, 81 ... fan, 91 ... intake main duct, 92 ... intake channel, 95 ... exhaust main duct Part, g: Ventilation gap (gap).

Claims

The battery body has a flat rectangular parallelepiped battery body and a terminal provided at one end of the battery body. The battery body has a first surface having the largest area among the surfaces of the battery body, the first body A plurality of batteries having a second surface having a smaller area than one surface and having the first surfaces facing each other with a gap between the first surfaces of adjacent battery bodies;
An electrical connection part electrically connecting the terminals of the plurality of batteries;
A battery case containing battery bodies of the plurality of batteries;
A terminal case that is combined with the battery case and accommodates the electrical connection portion, and covers the gap formed between the first surfaces of the battery bodies adjacent to each other from one side, and
The battery case extends substantially parallel to the first surface of the battery body at a position opposite to the terminal case with respect to the battery case, and communicates with the inside of the battery case from the side opposite to the terminal case. A ventilation duct;
A second ventilation duct that extends substantially parallel to the second surface of the battery body and communicates with the inside of the battery case from a direction different from the direction in which the battery case and the terminal case are aligned;
A battery device comprising:
The battery case and the terminal case are aligned in a first direction,
The first ventilation duct is a direction substantially parallel to the first surface of the battery body at a position opposite to the terminal case with respect to the battery case, and intersects the first direction. Extended in the direction,
The battery device according to claim 1.
The battery case and the second ventilation duct communicated in the second direction;
The battery device according to claim 2.
The first ventilation duct is an intake duct that allows cooling fluid to flow into the battery case, and the second ventilation duct is an exhaust duct that allows the cooling fluid to flow through the battery case.
The battery device according to claim 2.
The second ventilation duct has a first exhaust passage and a second exhaust passage,
The first exhaust passage and the second exhaust passage are arranged separately on both sides of the battery case in the second direction, and communicate with the inside of the battery case, respectively.
The battery device according to claim 4.
The second ventilation duct has an extension portion that is located on a side opposite to the battery case with respect to the terminal portion case and through which the wind flows along the terminal portion case.
The battery device according to claim 1.
The first exhaust passage has an extension portion that is located on the opposite side of the battery case with respect to the terminal case and that has an extension portion that flows along the terminal case and merges with the second exhaust passage. did,
The battery device according to claim 5.
The terminal part case has an opening that communicates with the inside of the second ventilation duct and a part of the cooling fluid that flows in the second ventilation duct flows into the terminal part case.
The battery device according to claim 1.
The battery case has a first region and a second region, and the first region and the second region each have at least one ventilation port for communicating the first ventilation duct with the inside of the battery case. The second region is closer to the second ventilation duct than the first region,
The opening rate of the ventilation hole in the second region is smaller than the opening rate of the ventilation port in the first region,
The battery device according to claim 1.
A plurality of battery modules each including the plurality of batteries, the electrical connection portion, the battery case, and the terminal portion case, and arranged in multiple stages in the direction in which the battery case and the terminal portion case are arranged; ,
With fans,
Further comprising
The first ventilation duct has a plurality of ventilation channels provided corresponding to the plurality of battery modules, and each of the plurality of ventilation channels is different from the terminal case with respect to the battery case. It extends substantially parallel to the first surface of the battery body at the opposite side position and communicates with the inside of the battery case from the opposite side of the terminal case,
The second ventilation duct communicates with the inside of the battery case of the plurality of battery modules,
The fan is provided in at least one of the first ventilation duct and the second ventilation duct.
The battery device according to claim 1.
The first ventilation duct is an intake duct having an intake main duct portion extending in a direction in which the plurality of battery modules are arranged in multiple stages,
The second ventilation duct is an exhaust duct having an exhaust main duct portion extending in a direction in which the plurality of battery modules are arranged in multiple stages,
The ventilation cross-sectional area of the exhaust main duct part is approximately 0.5 times or more the ventilation cross-sectional area of the intake main duct part.
The battery device according to claim 10.