JP6507751B2 - Battery gas discharge structure - Google Patents

Description

  The present disclosure relates to a gas discharge structure of a battery that discharges gas generated from a battery mounted in a vehicle compartment to the outside of the vehicle compartment.

  Some vehicles, such as hybrid vehicles, have a battery pack equipped with a large number of batteries mounted in the passenger compartment. In such a vehicle, gas may be released from the battery due to a manufacturing defect of the battery, a collision or the like. An exhaust structure of a battery has been proposed in which the released gas is released to the outside of the vehicle so as not to leak into the vehicle compartment (see Patent Document 1).

  The exhaust structure of the battery described in Patent Document 1 includes an exhaust hose for flowing exhaust air from a battery pack mounted in a vehicle compartment, a rear floor cross member attached to the lower side of a vehicle body floor between rear wheels, and jackup An exhaust passage formed by the point member and the vehicle body floor and communicated with the space outside the vehicle is provided. Exhaust gas discharged from the exhaust hose is discharged out of the vehicle through a space separated from the space outside the vehicle by the jack up point member via the space formed by the vehicle body floor and the rear floor cross member.

Patent No. 4826342

  The discharge hose described in Patent Document 1 extends from one end of the battery pack in the vehicle width direction and is bent toward the rear of the vehicle body to extend the rear of the battery pack, and the end of the discharge hose is a rear floor cross member It is arranged to be connected to That is, the discharge hose is connected to the rear floor cross member so as to pass through the position on the rear side of the battery pack. For this reason, when the vehicle collides due to a collision or the like, if the rear part of the vehicle behind the battery pack comes in contact with the discharge hose and the discharge hose is damaged, gas leaks from the discharge hose and enters the vehicle compartment There is a risk of intrusion.

  In view of the above-described circumstances, at least one embodiment of the present invention aims to provide a battery gas discharge structure of a battery which is free from the risk of gas being leaked into the vehicle compartment when the discharge hose is damaged at the time of rear collision of the vehicle. I assume.

  The gas discharge structure of a battery according to some embodiments of the present invention includes a high voltage component pack which is at least accommodated in a battery and supported by a pair of side members extended in the front and rear direction on both sides in the vehicle body width direction; An exhaust pipe connected on the side to the high voltage component pack and connected on the other end side to the side member and circulating exhaust gas from the battery from the high voltage component pack into the side member; The voltage component pack is supported by the side members via a plurality of brackets, and the exhaust pipe is disposed so as to extend between a pair of the brackets disposed adjacent in the front-rear direction in a plan view of the vehicle body Be done.

  According to the gas discharge structure of the battery, the exhaust pipe extends between a pair of brackets arranged adjacent in the front-rear direction in plan view of the vehicle body, so that the rear portion of the vehicle body is on the front side at the time of rear collision of the vehicle body. When deformed, the high voltage component pack is pushed forward by the deformed rear part of the vehicle and moves. Here, since the strength of the side member is greater than that of the bracket, when the high voltage component pack moves to the front side, the pair of brackets arranged adjacent to each other in the front-rear direction is the high voltage component with respect to the portion connected to the side member side The part connected to the pack side is deformed to move forward. Therefore, the gap between the pair of brackets in the front-rear direction hardly changes in plan view. Therefore, there is no risk that the exhaust pipe will be damaged by the brackets coming into contact with the exhaust pipe extending between the pair of brackets. Therefore, it is possible to realize the gas discharge structure of the battery without the risk that the exhaust pipe may be damaged and the gas may leak into the vehicle interior at the time of the rear collision of the vehicle.

  Further, in some embodiments, the exhaust pipe is configured to be disposed close to a bracket disposed on the front side of the pair of brackets.

  In this case, since the exhaust pipe is disposed close to the bracket disposed on the front side of the pair of brackets, the gap between the exhaust pipe and the rear bracket is large in a plan view of the vehicle body. Therefore, even if the rear side of the pair of brackets is deformed and moved to the front during rear collision of the vehicle body, the rear side bracket can be less likely to contact the exhaust pipe. . Therefore, the risk of damaging the exhaust pipe can be further reduced.

  Further, in some embodiments, the exhaust pipe is configured to extend obliquely to the front side of the vehicle body as it travels to the outer side in the vehicle body width direction in a plan view of the vehicle body.

  In this case, the exhaust pipe is inclined and extends forward in the vehicle body width direction in the plan view of the vehicle body in plan view of the vehicle body. Therefore, when the high voltage component pack moves forward in the rear collision of the vehicle body, Because the strength of the side members is high, the amount of forward movement of the high voltage component pack is larger than that of the side members. Therefore, although the high voltage component pack side end of the exhaust pipe also moves forward, the exhaust pipe is inclined forward to advance outward in the vehicle width direction in a plan view of the vehicle body. If the amount of movement is not large, the exhaust pipe is not pulled and a large tension does not act. For this reason, a possibility that a big tension acts on the exhaust pipe and damaging it can be reduced.

  In addition, in some embodiments, the high voltage component pack has a bottomed container-like tray having an opening at the top and containing the battery, and a cover covering the opening of the tray. The exhaust pipe is configured to extend to the outside of the high voltage component pack by passing between contact portions where the cover and the tray contact when the opening is closed by the cover.

  In this case, since the exhaust pipe passes through the contact portion where the cover and the tray contact when the opening is closed by the cover, it is not necessary to provide a hole for passing the exhaust pipe in the tray. For this reason, it is possible to reliably prevent the possibility of water entering the tray from the tray.

  Also, in some embodiments, the contact portion is configured to be disposed above the vehicle floor.

  In this case, even when the occupant spills liquid such as water on the vehicle body floor, the contact portion is disposed above the vehicle body floor, so that the possibility of water entering from the contact portion can be reduced.

  Also, in some embodiments, the tray of the high voltage component pack is formed by integral molding.

  In this case, since the tray is formed by integral molding, there is no risk of forming a hole in the tray. For this reason, it is possible to further reduce the possibility that a liquid such as water intrudes into the tray.

  According to at least some embodiments of the present invention, it is possible to provide a battery gas discharge structure of a battery without the risk of the discharge hose being damaged at the time of a rear collision of the vehicle and the gas leaking out into the vehicle interior.

FIG. 1 is a partial perspective view of a rear portion of a vehicle provided with a gas discharge structure of a battery according to an embodiment of the present invention. It is sectional drawing of the part corresponded to the II arrow of FIG. It is an enlarged view of the part corresponded to the A arrow of FIG. FIG. 5 is a partial plan view of a vehicle rear structure at the time of a vehicle rear collision. FIG. 7 is a partial plan view of a vehicle rear structure showing another embodiment of an exhaust pipe.

  Hereinafter, an embodiment of a gas discharge structure of a battery of the present invention will be described with reference to FIGS. 1 to 5 according to the attached drawings. In addition, the material of the component described in this embodiment, the shape, the relative arrangement, etc. are not the meaning which limits the scope of the present invention to this, but are only a mere illustration example.

  FIG. 1 shows a partial perspective view of a rear portion of a vehicle body to which a battery exhaust structure is applied. In addition, the direction of the arrow shown in FIG. 1 is demonstrated below as the front-back direction and the left-right direction. The vehicle in the present embodiment is a vehicle equipped with an indoor battery (for example, an electric vehicle, a hybrid vehicle (vehicle provided with an electric motor and an engine), etc.), and its vehicle body is a monocoque body structure without a body frame. . The monocoque body structure is a structure assembled into a box shape by laminating thin steel plates formed by pressing and joining them by spot welding.

  As shown in FIGS. 1 and 2, a rear floor pan 3 as a vehicle body floor is disposed at the rear portion 1 a of the vehicle body 1. A storage recess 5 is formed in the rear floor pan 3, and a high voltage component pack 12 storing at least a plurality of battery cells 10 is stored in the storage recess 5. The high voltage component pack 12 accommodates a battery module 11 including a plurality of battery cells 10 and high voltage components such as an inverter of a motor and a DC-DC converter. Also, the battery module 11 is housed in the high voltage component pack 12. The structure for storing the high voltage component pack 12 in the storage recess 5 will be described later.

  The lower sides of the left and right sides of the vehicle body 1 of the rear floor pan 3 are connected by welding or the like to a rear floor side member 7 extending in the vehicle longitudinal direction (in FIG. 1, the rear floor side member 7 on the right side of the vehicle body is indicated by a broken line). ). As shown in FIGS. 2 and 3, the rear floor side member 7 is formed in a hat shape in cross section whose upper side is opened, and the left and right flanges 7a are joined to the rear floor pan 3 to form a closed cross section. Configured. Thus, the rear floor side member 7 reinforces the rear floor pan 3 to increase the strength of the body.

  A plurality of communication holes 7b are provided in the lower portion of the rear floor side member 7 at intervals in the longitudinal direction of the rear floor side member 7, and the communication holes 7b communicate the internal space 7c of the rear floor side member 7 with the outside air. ing. Further, in the rear floor pan 3 joined to the upper portion of the rear floor side member 7, a hole 3a for passing an exhaust pipe 20 for discharging the gas generated from the battery cell 10 is formed. A grommet 4 is inserted into the hole 3a, and the tip of the exhaust pipe 20 is fixed to the hole 3a via the grommet 4.

  The rear floor side member 7 is a component that receives a load directly via a rear bumper (not shown) at the time of rear collision (collision), and is deformed when the input load from the rear bumper becomes a predetermined value or more. It is configured to do.

  A high voltage component pack 12 is stored in the storage recess 5 of the rear floor pan 3. As shown in FIGS. 1 and 2, the high voltage pack 12 has a bottomed container-like tray 13 having an opening 13 a at the top and capable of accommodating the battery module 11, and a cover covering the opening 13 a of the tray 13. And 15.

  The tray 13 includes a bottom surface portion 13b, a peripheral wall portion 13c standing upward from the periphery of the bottom surface portion 13b, and a main body side flange portion 13d extending outward from the upper end of the peripheral wall portion 13c. An opening 13a is formed inside the peripheral wall 13c. The cover 15 includes a top plate 15a covering the opening 13a, a side wall 15b extending downward from the periphery of the top plate 15a, and a cover-side flange 15c extending outward from the lower end of the side wall 15b. . When the cover 15 is disposed on the tray 13, the cover side flange portion 15c is disposed opposite to the main body side flange portion 13d, and a fastening means such as a bolt and a nut is inserted between these flange portions to cover the tray 13 15 can be fixed.

  As shown in FIG. 1, a pair of brackets 30 and 30 ′ arranged at an interval in the front-rear direction is provided on the side surfaces of the respective peripheral wall portions 13 c on the left and right sides of the tray 13. The brackets 30, 30 'are formed in a plate shape, one end of the brackets 30, 30' is connected to the side surface of the peripheral wall 13c by welding or the like, and the other end of the brackets 30, 30 'is connected to the rear floor via the rear floor pan 3. It is fastened and fixed to the side member 7 by a bolt or the like. Thus, the high voltage component pack 12 is fixed to the rear floor side member 7 via the four brackets 30, 30 ′ and the rear floor pan 3.

  As shown in FIG. 2, the battery module 11 is configured by connecting a large number of battery cells 10 (for example, lithium ion batteries, nickel hydrogen batteries, etc.) in series. For this reason, since the battery module 11 is a heavy component, steering stability can be improved by arranging the battery module 11 at a position close to the center of gravity of the vehicle (position close to the center). For example, when the battery cell 10 is in the overcharged state or the overdischarged state, the battery cell 10 discharges gases such as hydrogen, carbon dioxide, and carbon monoxide. For this reason, the high-voltage component pack 12 containing the battery module 11 is provided with an exhaust pipe 20 for discharging these gases.

  As shown in FIGS. 2 and 3, the exhaust pipe 20 has one end connected to the lower side of the battery module 11 and the other end extending upward along the inner surface of the peripheral wall 13 c of the tray 13 to cover the cover 15. It extends to the outside of the high voltage component pack 12 through the space between the side flange portion 15c and the body side flange portion 13d of the tray 13 (hereinafter referred to as "contact portion 17"). As shown in FIG. 1 and FIG. 2, the exhaust pipe 20 extends between a pair of brackets 30, 30 ′ arranged adjacent to each other in the front-rear direction in plan view of the vehicle body 1 and along the upper surface of the rear floor pan 3. Extends to the side of the rear floor side member 7, and the tip of the exhaust pipe 20 is bent downward and inserted into the rear floor side member 7 through the grommet 4. In this embodiment, the high voltage component pack 12 The extending exhaust pipe 20 is disposed close to the bracket 30 disposed on the front side of the pair of brackets 30, 30 'disposed adjacent in the front-rear direction.

  Therefore, when gas is generated from the battery module 11, the gas is released into the internal space 7c of the rear floor side member 7 through the exhaust pipe 20 and then released to the outside through the communication hole 7b.

  The main body side flange portion 13 d of the tray 13 of the high voltage component pack 12 is disposed above the upper surface of the rear floor pan 3. Therefore, when the occupant spills liquid such as water on the rear floor pan 3, the contact portion 17 between the main body side flange portion 13 d and the cover side flange portion 15 c is disposed above the upper surface of the rear floor pan 3. As a result, the possibility of water entering the tray 13 from the contact portion 17 can be reduced.

  Further, the tray 13 is formed by integral molding. For this reason, the possibility that the hole is formed in the tray 13 is small. Therefore, the possibility of water in the rear portion 1 a of the vehicle body 1 entering the tray 13 can be further reduced.

  Next, a change in the rear body structure when the vehicle body 1 makes a rear collision will be described. When the rear portion 1a of the vehicle body 1 is deformed to the front side at the time of rear collision of the vehicle body 1, as shown in FIG. 4, the high voltage component pack 12 is pushed by the rear portion 1a of the deformed vehicle body 1 and moves to the front side. Here, since the strength of the rear floor side member 7 is larger than the strength of the brackets 30, 30 ', when the high voltage component pack 12 moves to the front side, the pair of brackets 30, 30' arranged adjacent to each other in the front and rear direction With respect to the portion connected to the side member 7 side, the portion connected to the high voltage component pack 12 is deformed so as to move to the front side. However, the distance between the pair of brackets 30, 30 'in the front-rear direction gap 33 hardly changes in plan view. Therefore, there is no possibility that the exhaust pipe 20 is damaged by the bracket 30 'coming into contact with the exhaust pipe 20 extending between the pair of brackets 30, 30'. Therefore, there is no possibility that the exhaust pipe 20 may be damaged and gas may leak into the vehicle compartment at the time of a rear collision of the vehicle.

  Further, since the exhaust pipe 20 is disposed close to the bracket 30 disposed on the front side of the pair of brackets 30, 30 ', a gap between the exhaust pipe 20 and the rear bracket 30' in plan view Is getting bigger. Therefore, even if the bracket 30 'disposed on the rear side in the rear collision of the vehicle body 1 is deformed and moved to the front side, the possibility that the rear bracket 30' comes in contact with the exhaust pipe 20 can be further lowered. . Therefore, the risk of damaging the exhaust pipe 20 can be further reduced.

  Note that, as shown in FIG. 5, the exhaust pipe 20 may be inclined and extended toward the front side of the vehicle body as it proceeds to the right side of the vehicle body in a plan view. Thus, when the high voltage component pack 12 moves to the front during a rear collision of the vehicle body 1, the exhaust pipe 20 bends when the amount of movement of the high voltage component pack 12 is small, and the amount of movement is high As long as T increases, there is no risk that the exhaust pipe 20 will be damaged, as long as no tensile force acts on the exhaust pipe 20. Therefore, the risk of damaging the exhaust pipe 20 can be reduced.

  Further, as shown in FIG. 2, the exhaust pipe 20 passes through the contact portion 17 between the cover side flange portion 15 c of the cover 15 and the main body side flange portion 13 d of the tray 13 when the opening 13 a is closed by the cover 15. Therefore, it is not necessary to provide the tray 13 with a hole for passing the exhaust pipe 20. Therefore, the possibility of water entering the tray 13 can be reliably prevented.

  In the embodiment described above, the case where the two brackets 30, 30 'are provided on the right side of the high voltage component pack 12 is shown, but three or more brackets may be provided. The exhaust pipe 20 may be provided not only on the right side of the high voltage component pack 12 but also on the left side.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said form, A various change in the range which does not deviate from the objective of this invention is possible.

Reference Signs List 1 vehicle body 1a rear 3 rear floor pan 3a hole 4 grommet 5 storage recess 7 rear floor side member 7a flange 7b communicating hole 7c internal space 10 battery cell (battery)
DESCRIPTION OF SYMBOLS 11 battery module 12 high voltage parts pack 13 tray 13a opening part 13b bottom part 13c peripheral wall part 13d main body side flange part 15 cover 15a top plate part 15b side wall part 15c cover side flange part 17 contact part 20 exhaust pipe 30, 30 'bracket 33 Gap

Claims (6)

A high voltage component pack supported by a pair of side members accommodating at least a battery and extending in the front-rear direction on both sides in the vehicle body width direction;
And an exhaust pipe having one end connected to the high voltage component pack and the other end connected to the side member and circulating exhaust gas from the battery from the high voltage component pack into the side member.
The high voltage component pack is supported by the side member via a plurality of brackets.
The gas exhaust structure of a battery, wherein the exhaust pipe extends between a pair of the brackets disposed adjacent in the front-rear direction in a plan view of a vehicle body. The gas exhaust structure of a battery according to claim 1, wherein the exhaust pipe is disposed close to a bracket disposed on the front side of the pair of brackets. The gas discharge structure of a battery according to claim 2, wherein the exhaust pipe is inclined and extended to the front side of the vehicle body as it goes outward in the vehicle body width direction in a plan view of the vehicle body. The high voltage component pack has a bottomed container-like tray having an opening at the top and containing the battery, and a cover covering the opening of the tray.
The exhaust pipe extends to the outside of the high voltage component pack by passing between a contact portion where the cover and the tray contact when the opening is closed by the cover. The gas discharge structure of the battery according to any one of 3. The said contact part is arrange | positioned above a vehicle body floor. The gas discharge structure of the battery of Claim 4 characterized by the above-mentioned. The gas discharge structure of a battery according to claim 4, wherein the tray of the high voltage component pack is formed by integral molding.

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