JP6299953B2 - Vehicle battery mounting structure - Google Patents

Description

  The present invention relates to a battery mounting structure for a vehicle in which a main battery and a sub battery for supplying electric power to auxiliary devices included in the vehicle are mounted in an engine room.

  The vehicle is provided with various auxiliary machines including electrical components, and an auxiliary battery (12V battery) for supplying electric power to these auxiliary machines is also mounted on the vehicle. This auxiliary battery is generally mounted in the engine room. In recent years, in order to improve fuel efficiency of vehicles, vehicles in which a sub battery is mounted as an auxiliary battery together with a main battery have been put into practical use.

  Here, the sub-battery can be mounted in the vehicle compartment (for example, under the seat), but the distance from the main battery mounted in the engine room is increased. Therefore, there is a possibility that the wiring connecting the both becomes long, the component cost increases, and the work efficiency decreases. For this reason, it is preferable to mount the sub-battery together with the main battery in the engine room, and it is preferable to arrange the sub-battery adjacent to the main battery.

  Further, when the main battery and the sub-battery are arranged in the engine room, it is necessary to prevent the occurrence of a short circuit due to the damage of these batteries at the time of a frontal collision. As a structure for this purpose, for example, in a vehicle in which the first and second batteries are mounted in the engine room, the first and second batteries are disposed at the rear end of the engine room, so that a front collision can occur. There is one that ensures a crash space (see, for example, Patent Document 1).

Japanese Patent No. 5158315

  If a plurality of batteries can be arranged at the rear end of the engine room as described above, the battery may be prevented from being damaged during a forward collision.

  However, the space of the engine room is limited, and the main battery and the sub battery may not be arranged at desired positions. That is, the main battery and the sub-battery must be disposed relatively in front of the engine room, and there are cases where a sufficient crash space cannot be secured.

  As countermeasures in this case, for example, the main battery is surrounded by a protector such as metal, and the sub battery is formed of aluminum or iron, or the thickness of the battery is increased by increasing the plate thickness. Although it is conceivable to increase the rigidity, there is a problem that the weight of the battery increases. In other words, as the weight of the battery increases, it is necessary to increase the strength of the portion where the battery is fixed, leading to an increase in the weight of the entire vehicle.

  The present invention has been made in view of such circumstances, and can suppress the increase in the weight of the vehicle and can mount the main battery and the sub battery in the engine room, and also can suppress the damage of the battery at the time of a forward collision. An object is to provide a battery mounting structure.

A first aspect of the present invention that solves the above problem is a battery mounting structure for a vehicle in which a main battery and a sub battery are mounted in an engine room, and the sub battery is connected to the main battery in front of the main battery. An upper cushioning member made of an insulating material is disposed between the sub-battery and the frame member forming the engine room, and the frame member forms an upper edge of the front end of the engine room. The upper bar includes an upper bar center constituting a central portion in the vehicle width direction, and a pair of upper bar sides respectively connected to both ends of the upper bar center in the vehicle width direction. The battery accommodates a battery cell unit and a control unit for controlling the battery cell unit in the casing. Rutotomoni, the control unit in the vehicle longitudinal direction is in the battery mounting structure for a vehicle, characterized in that disposed in a position that does not overlap the upper bar center.

  According to a second aspect of the present invention, in the battery mounting structure for a vehicle according to the first aspect, the buffer member is disposed at a position overlapping the positive terminal portion of the sub-battery in the front-rear direction of the vehicle. The vehicle has a battery mounting structure.

According to a third aspect of the present invention, in the vehicle battery mounting structure according to the first or second aspect, the buffer member is a hollow member having a space therein.

According to a fourth aspect of the present invention, there is provided the vehicle battery mounting structure according to the third aspect, wherein the buffer member is a reservoir tank of a radiator.

According to a fifth aspect of the present invention, in the vehicle battery mounting structure according to the third or fourth aspect, the housing of the sub battery and the buffer member are formed of a resin material, and the strength of the housing of the sub battery is However, it is in the battery mounting structure of the vehicle characterized by being lower than the intensity | strength of the said buffer member.

  In the present invention, by providing the buffer member, it is possible to suppress occurrence of a short circuit in the sub-battery at the time of a vehicle front collision. Further, since it is not necessary to increase the rigidity of the sub-battery or the like, an increase in the weight of the vehicle can be suppressed.

It is a top view which shows the whole engine room structure of a vehicle. It is a top view which shows the mounting structure of the battery which concerns on one Embodiment of this invention. It is a perspective view which shows typically the frame structure of a vehicle front part. It is a top view which shows typically the state of the battery at the time of a front collision. It is a top view which shows the modification of the mounting structure of the battery which concerns on one Embodiment of this invention. It is a top view which shows the modification of the mounting structure of the battery which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the engine room 2 of the vehicle 1 according to the present embodiment has an engine 3 mounted in the center thereof, and a radiator 4 mounted in front of the engine 3.

  Here, for example, as shown in FIG. 3, the upper edge of the front end of the engine room 2 of the vehicle 1 is a metal (conductor) skeleton member that extends in the front-rear direction on both the left and right sides in the vehicle width direction. 21 and a front end upper bar (hereinafter referred to as an upper bar) 22 that extends in the width direction of the vehicle body and connects the left and right upper frames 21 at the front end of the vehicle body. The upper bar 22 includes an upper bar center 23 located at the center in the vehicle width direction, and upper bar sides 24 provided at both ends of the upper bar center 23.

  The radiator 4 is disposed below the upper bar center 23, and a front end cross member 25 extending in the vehicle width direction is provided in front of the radiator 4. The front end cross member 25 is connected to the upper bar center 23 by a support portion 26.

  Returning to the description of FIG. 1 and FIG. 2, various members are mounted around the engine 3 in the engine room 2, for example, on the side of the engine 3 (right side in the drawing). A main battery 5 and a sub-battery 6 which are batteries for supplying electric power to the auxiliary machines and improving the fuel consumption of the vehicle are mounted. The main battery 5 and the sub-battery 6 are disposed adjacent to each other in the engine room 2. Specifically, the sub-battery 6 is disposed adjacent to the front side (lower side in the figure) of the main battery 5. By arranging the main battery 5 and the sub-battery 6 adjacent to each other in this way, the wiring for connecting them can be shortened, the component cost can be reduced, and the work efficiency can be improved.

  By the way, when the main battery 5 and the sub-battery 6 are arranged in the engine room 2 as described above, the sub-battery 6 is positioned on the relatively front end side in the engine room 2. Therefore, the crash space at the time of forward collision is relatively narrow. However, according to the present invention, as will be described below, even if the crash space is relatively narrow, damage to the sub battery 6 and the main battery 5 at the time of a forward collision can be suppressed.

  As shown in FIGS. 1 and 2, in the battery mounting structure according to the present embodiment, a part of the sub-battery 6 is disposed at a position overlapping the upper bar center 23 in the front-rear direction of the vehicle 1. . In a plan view, a buffer member made of an insulating material is disposed between the sub battery 6 and the upper bar center 23. That is, the reservoir tank 7 of the radiator 4 is disposed between the sub battery 6 and the upper bar center 23, and the reservoir tank 7 functions as the buffer member. Since the reservoir tank 7 is a hollow member formed of a resin material that is an insulating material and having a space inside, the reservoir tank 7 can alleviate an impact input to the sub-battery 6 at the time of a front collision, and can also reduce the sub-battery 6. And the surrounding members can be insulated.

  For example, as shown in FIG. 4, at the time of a frontal collision of the vehicle 1, even if the upper bar center 23 that is a metal (conductor) is deformed to the rear side of the vehicle 1, the reservoir tank 7 that is a buffer member is 23 and the sub-battery 6, thereby reducing the impact input to the sub-battery 6. Further, it is possible to suppress the upper bar center 23 from breaking into the housing of the sub battery 6 and entering the inside. Further, the reservoir tank 7 made of an insulating material can insulate the sub-battery 6 from surrounding members such as the upper bar center 23. Therefore, it is possible to suppress occurrence of a short circuit in the sub battery 6 at the time of a front collision. For example, even when the casing is damaged, it is possible to insulate the internal electric circuit component from the upper bar center 23 and to suppress the occurrence of a short circuit. Further, with such a configuration, it is not necessary to increase the rigidity of the sub-battery 6 and the like, and an increase in the weight of the vehicle can be suppressed.

  In the present embodiment, the sub-battery 6 includes the positive electrode terminal portion 6a in the vicinity of the end of the sub-battery 6 on the center side of the engine room, and the reservoir tank 7 overlaps the positive electrode terminal portion 6a in the front-rear direction of the vehicle. Placed in position. Thereby, generation | occurrence | production of the short circuit at the time of a front collision can be suppressed more effectively.

  Although the housing of the sub battery 6 is made of a resin material, the positive terminal portion 6a of the sub battery 6 is made of a metal material. For this reason, at the time of a forward collision, the positive electrode terminal portion 6a is in contact with the upper bar center 23, which is a metal (conductor), and a short circuit is likely to occur. However, by arranging the reservoir tank 7 at a position facing the positive electrode terminal portion 6a, it is possible to more effectively suppress a short circuit due to contact between the positive electrode terminal portion 6a and the upper bar center 23 at the time of a forward collision.

  The sub battery 6 may be disposed on the vehicle front side of the main battery 5 as described above, but it is preferable that a part of the sub battery 6 is disposed so as not to overlap the upper bar center 23.

  Specifically, as shown in FIG. 5, the sub battery 6 includes a battery cell unit 10 including a plurality of battery cells 9 in the housing 8, and the battery cell unit 10 on the vehicle front side of the battery cell unit 10. A control unit (battery management unit: BMU) 11 for controlling 10 is accommodated. Then, the sub battery 6 is placed in the engine room so that the control unit 11 does not overlap the upper bar center 23 in the front-rear direction of the vehicle 1, that is, the control unit 11 is outside the upper bar center 23 in the vehicle width direction. 2 is preferable.

  The control unit 11 includes, for example, a plurality of circuit boards. If these circuit boards are damaged at the time of a forward collision, a problem such as a short circuit is likely to occur. However, by arranging the sub-battery 6 as described above, it is possible to effectively suppress contact between the upper bar center 23 and the circuit board constituting the control unit 11 at the time of a forward collision. That is, the occurrence of a short circuit at the time of a forward collision can be more reliably suppressed.

  Further, it is preferable that the interval between the reservoir tank 7 and the portion of the sub battery 6 facing the control unit 11 is set wider than the interval between the reservoir tank 7 and the portion other than the control unit 11 of the sub battery 6. In the example shown in FIG. 5, the interval between the reservoir tank 7 and the portion of the sub battery 6 facing the control unit 11 is controlled by gradually reducing the width of the reservoir tank 7 as it approaches the control unit 11. It is secured wider than the interval with the portion other than the unit 11. With such a configuration, the reservoir tank 7 comes into contact with a portion other than the control unit 11 of the sub-battery 6 and collides with the control unit 11 after a delay in a forward collision of the vehicle. Therefore, damage to the control unit 11 due to a forward collision can be further reliably suppressed.

  Furthermore, as shown in FIG. 6, the reservoir tank 7 is arranged in a position that does not overlap the control unit 11 of the sub battery 6 in the front-rear direction of the vehicle 1, and a relatively wide space is secured in front of the control unit 11. Is preferred. Thereby, the contact of the other member with respect to the control unit 11 at the time of a front collision can be suppressed. Therefore, damage to the control unit 11 due to a forward collision can be more reliably suppressed.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. The present invention can be modified as appropriate without departing from the spirit of the present invention.

  For example, in the above-described embodiment, a reservoir tank as a buffer member is disposed between the upper bar center and the sub-battery, but the buffer member is not limited to the reservoir tank. By using a reservoir tank, which is an existing member, as a buffer member, the battery mounting structure of the present invention can be realized at a low cost. However, a buffer member may be provided separately from the reservoir tank.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine room 3 Engine 4 Radiator 5 Main battery 6 Sub battery 6a Positive electrode terminal part 7 Reservoir tank (buffer member)
8 Housing 9 Battery cell 10 Battery cell unit 11 Control unit 21 Upper frame (frame member)
22 Upper bar (framework member)
23 upper bar center 24 upper bar side 25 front end cross member 26 support part

Claims (5)

A vehicle battery mounting structure in which a main battery and a sub battery are mounted in an engine room,
The sub-battery is disposed adjacent to the main battery on the vehicle front side of the main battery, and a buffer member made of an insulating material is disposed between the sub-battery and a skeleton member that forms the engine room. ,
The skeleton member is an upper bar that forms the upper edge of the front end of the engine room,
The upper bar has an upper bar center that constitutes a vehicle width direction center portion, and a pair of upper bar sides that are respectively coupled to both ends of the upper bar center in the vehicle width direction,
The sub-battery accommodates a battery cell unit and a control unit for controlling the battery cell unit in a housing thereof, and is disposed at a position where the control unit does not overlap the upper bar center in the vehicle front-rear direction. A battery mounting structure for a vehicle. The vehicle battery mounting structure according to claim 1,
The battery mounting structure for a vehicle, wherein the buffer member is disposed at a position overlapping with a positive electrode terminal portion of the sub-battery in a longitudinal direction of the vehicle. In the battery mounting structure of the vehicle according to claim 1 or 2 ,
The battery mounting structure for a vehicle, wherein the buffer member is a hollow member having a space inside. The battery mounting structure for a vehicle according to claim 3 ,
A battery mounting structure for a vehicle, wherein the buffer member is a reservoir tank of a radiator. In the vehicle battery mounting structure according to claim 3 or 4 ,
A battery mounting structure for a vehicle, wherein the housing of the sub battery and the buffer member are made of a resin material, and the strength of the housing of the sub battery is lower than the strength of the buffer member.

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