JP6416683B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including a supply duct member that supplies a cooling medium to a power storage unit in which a plurality of storage batteries are stacked.

  Generally, a power storage unit including a storage battery group (battery module) in which a plurality of storage batteries (battery cells) are stacked is known. Since this power storage unit is mounted on an electric vehicle such as a hybrid vehicle or an EV, for example, the output voltage is set high by using a battery pack in which a large number of storage battery groups are stacked.

  Since this type of storage battery tends to deteriorate particularly at high temperatures, temperature control is required. For this reason, a cooling flow path in which the power storage device is arranged is usually formed. One end of the cooling flow path is provided with an intake opening that opens upward into the vehicle interior, and the other end of the cooling flow path is provided with a cooling fan that takes air in the vehicle interior into the cooling flow path. It has been.

  However, since the intake opening that opens into the passenger compartment is directed upward, there is a high possibility that foreign matter or the like will enter the cooling flow path, and the power storage device may be damaged due to the influence of the foreign matter. Therefore, for example, a cooling structure for a power storage device disclosed in Patent Document 1 is known.

  In this cooling structure, the first intake port provided in the duct cover that covers the intake duct of the power storage device is opened sideways, and the second intake port provided in the intake duct is referred to as the first intake port. Open sideways in the opposite direction. As a result, even if foreign matter temporarily enters from the first intake port, the foreign matter is less likely to enter the opposite second intake port, and as a result, the foreign matter is prevented from reaching the inside of the power storage device. It can be done.

JP 2014-158202 A

  The present invention has been made in connection with this type of technology, and provides a power storage device capable of suppressing entry of foreign substances as much as possible and particularly reducing pressure loss of a cooling medium satisfactorily. With the goal.

  The present invention relates to a power storage device including a supply duct member that supplies a cooling medium to a power storage unit in which a plurality of storage batteries are stacked. In the power storage device, the supply duct member includes an inlet-side opening for introducing the cooling medium, and an outlet-side opening connected to the inlet-side opening via a bent portion and opened to the power storage unit side. ing.

  The inner wall surface of the supply duct member has an inclined portion that is inclined upward from the projection surface of the inlet side opening toward the outlet side opening from the outside.

  In this power storage device, the inclined portion is preferably a flat surface or a concave curved surface.

  Furthermore, in this power storage device, it is preferable that the opening on the inlet side opens in the vertical direction. At that time, a foreign object is dropped from the end opening closest to the outlet opening of the inlet opening to the outlet opening with respect to a virtual vertical line extending vertically downward toward the outlet opening. A falling direction line is set. Here, it is preferable that the inclined portion is arranged on the line of the drop direction line.

  Furthermore, in this power storage device, it is preferable that the inclined portion has an inclination angle of 1.5 θ ° or more with respect to the horizontal direction.

  In this power storage device, it is preferable that a buffer material be provided on the surface of the inclined portion.

  According to the present invention, the inner wall surface of the supply duct member is provided with the inclined portion that is inclined upward toward the outlet opening. For this reason, when foreign matter falls from the inlet side opening to the inner wall surface of the supply duct member, the foreign matter is bounced back to the opposite side to the outlet side opening, that is, opposite to the power storage unit, due to the inclination of the inclined portion. . Accordingly, it is possible to suppress foreign substances from entering the power storage unit as much as possible, and to simplify the shape of the bent portion, and in particular, it is possible to favorably reduce the pressure loss of the cooling medium.

1 is a schematic perspective explanatory view of a power storage device according to a first embodiment of the present invention. It is side surface explanatory drawing of the said electrical storage apparatus. It is principal part sectional explanatory drawing of the said electrical storage apparatus. 6 is a cross-sectional explanatory view of an intake duct member of Comparative Example 1. FIG. 10 is a cross-sectional explanatory view of an intake duct member of Comparative Example 2. FIG. It is principal part cross-sectional explanatory drawing of the electrical storage apparatus which concerns on the 2nd Embodiment of this invention. It is principal part cross-sectional explanatory drawing of the electrical storage apparatus which concerns on the 3rd Embodiment of this invention.

  As shown in FIGS. 1 and 2, the power storage device 10 according to the first embodiment of the present invention is mounted on an electric vehicle (for example, a hybrid vehicle or an EV) (not shown). In the power storage device 10, a plurality of sets, for example, four sets of power storage units (power storage modules) 12A, 12B, 12C, and 12D are arranged in the arrow A direction.

  The power storage units 12A, 12B, 12C, and 12D are electrically connected to each other in series. Although not shown, each of the power storage units 12A, 12B, 12C, and 12D includes a plurality of storage batteries (battery cells) and an insulating separator that are alternately stacked and accommodated in the casings 14A, 14B, 14C, and 14D. A storage battery consists of a lithium ion battery, for example.

  A lower duct member 16 is integrally connected to the lower portions of the casings 14A, 14B, 14C, and 14D, and an upper duct member 18 is integrally connected to the upper portions of the casings 14A, 14B, 14C, and 14D. Provided.

  A discharge flow passage 16a is formed in the lower duct member 16, and an inlet side of the fan 20 is connected to the downstream side of the discharge flow passage 16a. As shown in FIG. 1, a DC / DC converter 22 is connected to the outlet side of the fan 20, and an exhaust duct member 24 is connected to the DC / DC converter 22. The DC / DC converter 22 has a function of stepping down a direct current for driving auxiliary equipment.

  A supply flow passage 18a is formed in the upper duct member 18, and an intake duct member (supply duct member) 26 is connected to the upstream side of the supply flow passage 18a. As shown in FIG. 2, the intake duct member 26 is provided with a grill 30 in which a plurality of louvers 28 a and 28 b are arranged so as to intersect with each other on the upper surface. The plurality of louvers 28 a arranged in the lateral direction are inclined as a whole so that the height decreases along the direction away from the upper duct member 18.

  The intake duct member 26 is connected to an inlet-side opening 32 for introducing a cooling medium, for example, external air, and an outlet-side opening connected to the inlet-side opening 32 via a bent portion 34 and opened to the power storage unit 12A side. Part 36. The inlet side opening 32 is formed by the grill 30, and the bent portion 34 is formed by the inner wall surface 38.

The inner wall surface 38 of the intake duct member 26 has a horizontal plane 38f extending in the horizontal direction. An inclined portion 38 _{inc that} is inclined upward (upward in the direction of arrow B) from the outer side toward the outlet side opening 36 than the projection surface 32f of the inlet side opening 32 is connected to the horizontal plane 38f. The inclined portion 38 _inc is a concave curved surface.

As shown in FIG. 3, the plurality of louvers 28a have a plate shape that is long in the lateral direction, and are arranged in a standing posture in the vertical direction. The entrance side opening part 32 opened toward the direction is formed. A drop angle θ ° from the _end opening 32 _end closest to the outlet opening 36 of the inlet opening 32 toward the outlet opening 36 with respect to a virtual vertical line Lv extending vertically downward. The drop direction line Ld at which the foreign matter falls is set. The drop angle θ ° is set based on the size and weight of the foreign matter, the air volume of the air flowing through the intake duct member 26, and the like.

An inclined portion 38 _inc is arranged on the line of the drop direction line Ld. The inclined portion 38 _inc has an angle of inclination of an angle α ° formed by the virtual horizontal line Lh and the tangent line Ls of 1.5θ ° or more (angle α ° ≧ angle 1.5θ °). A cushioning material is provided on the surface of the inclined portion 38 _inc as necessary. As the cushioning material, a material having a low elastic modulus is used. For example, low-resilience urethane, vibration damping rubber, or the like can be used.

  The operation of power storage device 10 configured as described above will be described below.

  As shown in FIG. 1, when the fan 20 is driven, external air is sucked from the inlet side opening 32 of the intake duct member 26. As shown in FIGS. 2 and 3, the air sucked into the intake duct member 26 is introduced into the supply flow passage 18 a in the upper duct member 18 from the outlet side opening 36 through the bent portion 34. For this reason, as shown in FIG. 2, air flows into the casings 14A, 14B, 14C, and 14D communicating with the supply flow passage 18a. And the air which cooled each electrical storage unit 12A, 12B, 12C and 12D is discharged | emitted by the discharge flow path 16a in the lower duct member 16. FIG.

  As shown in FIG. 1, the air discharged into the discharge flow passage 16 a is sucked into the fan 20, and then the DC / DC converter 22 is cooled and introduced into the exhaust duct member 24. Further, the air is discharged from the exhaust duct member 24 to the outside (outside of the electric vehicle).

In this case, in the first embodiment, the inner wall surface 38 of the intake duct member 26 is provided with an inclined portion 38 _{inc that} is inclined upward toward the outlet side opening 36. For this reason, when a foreign substance (for example, a clip or a pin) falls from the inlet side opening 32 to the inner wall surface 38 of the intake duct member 26, the foreign substance is _{separated from} the outlet side opening 36 by the inclination of the inclined portion 38 _inc. It is bounced back to the other side. Accordingly, it is possible to suppress foreign substances from entering the power storage unit 12A as much as possible, and to simplify the shape of the bent portion 34, and in particular, it is possible to favorably reduce the pressure loss of the refrigerant air. .

In addition, as shown in FIG. 3, the falling direction in which the foreign matter falls from the _end opening 32 _end toward the outlet side opening 36 at a falling angle θ ° with respect to a virtual vertical line Lv extending vertically downward. A line Ld is set. Then, the line of fall direction line Ld is inclined portion 38 _inc is disposed, the inclined portion 38 _inc is the angle α゜Ga a virtual horizontal line Lh and tangent Ls, the inclination angle greater than the angle 1.5Shita ° (Angle α ° ≧ angle 1.5θ °).

  For example, in the intake duct member 2a of the comparative example 1 shown in FIG. 4, the inner wall surface 38 does not have an inclined portion, and the horizontal plane 38f is disposed on the drop direction line Ld. For this reason, when the foreign matter falls along the drop direction line Ld, the foreign matter collides with the horizontal plane 38f and rebounds to the outlet opening 36 side at an angle of 2θ ° with the drop direction line Ld. Therefore, there is a possibility that the foreign matter enters the power storage unit 12 </ b> A disposed in the outlet side opening 36.

Further, in the intake duct member 2b of the comparative example 2 shown in FIG. 5, an inclined portion 4 _inc is arranged on the line of the falling direction line Ld, and the inclined portion 4 _inc is an angle formed by the virtual horizontal line Lh and the tangent line Ls. α1 ° has an inclination angle of angle θ ° (angle α1 ° = angle θ °). As a result, when the foreign matter collides with the inclined portion 4 _inc , it bounces substantially upward in the vertical direction, then falls at a falling angle of angle θ °, and collides with the inclined portion 4 _inc . For this reason, the foreign matter may move toward the outlet side opening 36 while repeatedly colliding with the inclined portion 4 _inc, and may enter the power storage unit 12 </ b> A disposed in the outlet side opening 36.

On the other hand, in the first embodiment, as shown in FIG. 3, the inclined portion 38 _inc has an inclination angle of an angle α ° formed by the virtual horizontal line Lh and the tangent line Ls of 1.5 °° or more. (Angle α ° ≧ angle 1.5θ °). At this time, if the angle α ° = the angle 1.5θ °, the foreign matter dropped along the falling direction line Ld rebounds along the falling direction line Ld after colliding with the inclined portion 38 _inc . Therefore, foreign matter, after repeated collisions at the same position of the inclined portion 38 _inc, is placed on the inner wall surface 38 moves in a direction away from the exit side opening 36 along the inclination of the inclined portion 38 _inc The Thereby, it can suppress that a foreign material approachs into the electrical storage unit 12A.

Further, if the angle α °> the angle 1.5θ °, the foreign matter dropped along the falling direction line Ld collides with the inclined portion 38 _inc and is further away from the outlet side opening 36 than the dropping direction line Ld. Bounce back in the direction to go. Then, the foreign matter falls and collides with a position moved in a direction away from the outlet side opening 36 from the previous time of the inclined portion 38 _inc and rebounds backward. For this reason, it is possible to prevent foreign matters from being placed on the inner wall surface 38 and entering the outlet side opening 36 as much as possible.

  FIG. 6 is an explanatory cross-sectional view of a main part of a power storage device 40 according to the second embodiment of the present invention. Note that the same components as those of the power storage device 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The power storage device 40 includes an intake duct member (supply duct member) 42, and the intake duct member 42 includes a grill 44. The grill 44 includes a plurality of louvers 46 a and 46 b that are arranged on the upper surface of the intake duct member 42 so as to cross each other. The plurality of louvers 46a are arranged in a standing posture in a direction inclined in the vertical direction, and an inlet-side opening 32a that opens in a direction inclined in the vertical direction is formed between the louvers 46a. .

  In 2nd Embodiment comprised in this way, the entrance side opening part 32a is opening toward the direction which inclines in a perpendicular direction. For this reason, in 2nd Embodiment, the effect similar to said 1st Embodiment is acquired.

  In addition, in 1st and 2nd embodiment, although the exit side opening part 36 is open in the perpendicular direction, it is not limited to this. For example, the outlet side opening 36 may be opened in the horizontal direction or in a direction inclined from the horizontal direction. The third embodiment described below can be configured similarly.

  FIG. 7 is an explanatory cross-sectional view of a main part of a power storage device 50 according to the third embodiment of the present invention.

The power storage device 50 includes an intake duct member (supply duct member) 52, and the intake duct member 52 has an inner wall surface 54. The inner wall surface 54 has a horizontal surface 54f extending in the horizontal direction. An inclined portion 54 _{inc that} is inclined upward from the projection surface 32 f of the inlet side opening 32 toward the outlet side opening 36 is connected to the horizontal plane 54 f. The inclined portion 54 _inc is a flat surface.

An inclined portion 54 _inc is arranged on the line of the drop direction line Ld. The inclined portion 54 _inc has an inclination angle of an angle α ° formed by the virtual horizontal line Lh and the tangent line Ls of 1.5θ ° or more (angle α ° ≧ angle 1.5θ °).

  In the third embodiment configured as described above, the same effect as in the first embodiment can be obtained. The third embodiment may be configured similarly to the second embodiment described above.

DESCRIPTION OF SYMBOLS 10, 40, 50 ... Power storage device 12A-12D ... Power storage unit 14A-14D ... Casing 16 ... Lower duct member 18 ... Upper duct member 20 ... Fan 24 ... Exhaust duct member 26, 42, 52 ... Intake duct members 28a, 28b, 46a, 46b ... louver 30, 44 ... grille 32, 32a ... inlet side opening 32f ... projection plane 34 ... bent portion 36 ... outlet opening 38, 54 ... inner wall surface 38 _inc, 54 _inc ... inclined portion 38f, 54f ... Horizontal plane

Claims (7)

A power storage device including a supply duct member that supplies a cooling medium to a power storage unit in which a plurality of storage batteries are stacked,
The supply duct member includes an inlet side opening for introducing the cooling medium;
An outlet-side opening connected to the inlet-side opening through a bent portion and opened to the power storage unit side;
Have
It said inner wall surface of the supply duct member have a sloping portion that slopes from the outside than the projection surface of the inlet-side opening upwardly toward the outlet opening,
Foreign matter falls from the end opening of the inlet side opening closest to the outlet side opening to the outlet side opening with a drop angle θ ° with respect to a virtual vertical line extending vertically downward A power storage device in which a falling direction line is set and the inclined portion is arranged on the line of the falling direction line .   The power storage device according to claim 1, wherein the inclined portion is a flat surface or a concave curved surface. The electric storage device according to claim 1 or 2, wherein said inlet-side opening is open toward the vertical direction, the power storage device.   The power storage device according to claim 3, wherein the inclined portion has an inclination angle of 1.5 ° or more with respect to a horizontal direction.   5. The power storage device according to claim 1, wherein a buffer material is provided on a surface of the inclined portion. 6. A power storage device including a supply duct member that supplies a cooling medium to a power storage unit in which a plurality of storage batteries are stacked,
The supply duct member includes an inlet side opening for introducing the cooling medium;
An outlet-side opening connected to the inlet-side opening through a bent portion and opened to the power storage unit side;
Have
The inner wall surface of the supply duct member has an inclined portion inclined upward from the projection surface of the inlet side opening toward the outlet side opening from the outside,
A power storage device, wherein a buffer material is provided on a surface of the inclined portion. The power storage device according to claim 6, wherein the inclined portion is a flat surface or a concave curved surface.

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