JP2004106807A - Hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a split back seat by achieving planarization of a luggage compartment restraining the decrease of a luggage compartment space in various types of hybrid vehicles such as sedan, mini-van, and SUV series. <P>SOLUTION: The hybrid vehicle is provided with a high-potential battery 10 supplying power to a driving motor 3 driving the vehicle and a low-potential battery 9 supplying the power to an auxiliary machine of the vehicle. The high-potential battery 10 is divided into a plurality of battery units 10a, 10b and the battery units 10a, 10b divided from the high-potential battery and the low-potential battery 9 are arranged in a divided manner on one side and the other side in the directions of side walls of vehicle bodies 16, 18 behind the backmost seat S, which enables homogenization of weight balance of the vehicle, planarization of the luggage compartment (a trunk room 15), and the split back seat. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hybrid vehicle including a power supply device having a high-potential battery that supplies power to a drive motor for driving a vehicle and a low-potential battery that supplies power to auxiliary devices of the vehicle.
[0002]
[Prior art]
In recent years, a hybrid vehicle (HEV) in which an engine and a drive motor are mounted, an auxiliary device is driven by a low-potential battery for the auxiliary device, and a drive motor is driven by a high-potential battery has been put into practical use.
[0003]
This type of hybrid vehicle is produced based on the body of a gasoline-powered vehicle in order to reduce costs by sharing it with a gasoline-powered vehicle, and a low-potential battery (12 V battery) for driving an engine, a drive motor, and accessories. A high-potential battery (36V battery) for driving a drive motor is disposed in a luggage room such as a trunk room in an engine room at a front portion of a vehicle because there is not enough room in the engine room.
[0004]
However, when the high-potential battery is arranged at the center of the floor of the luggage compartment, there is a problem that the battery hinders the trunk through. On the other hand, when the battery is arranged close to one side of the luggage compartment, trunk through is possible. However, since the high-potential battery is relatively heavy, there is a problem that the weight distribution between the left and right as a vehicle is deteriorated.
[0005]
Also, if the high-potential battery is attached to the back of the rear seat in the rearmost seat, the high-potential battery will hit the rear floor when the rear seat is tilted and the falling angle of the rear seat will be small. Therefore, there is a problem that mounting of a long object becomes difficult.
[0006]
In the electric vehicle, the battery is disposed in the luggage compartment at the rear of the vehicle.The battery is attached to the rear of the rear seat of the rearmost seat of the vehicle, and the battery is fixed to the floor of the luggage compartment and the cover fixed to the rear of the rear seat. It has been proposed to prevent the battery liquid from leaking to the luggage compartment side by covering (Patent Document 1). However, even in this case, it is not possible to solve the problems that the space of the luggage compartment is reduced, the luggage compartment cannot be flattened, and the trunk cannot be through.
[0007]
[Patent Document 1]
JP 10-255746 A
[Problems to be solved by the invention]
As described above, in the hybrid vehicle, even if the high-potential battery is disposed behind the rearmost seat of the vehicle, depending on the mounting position, the high-potential battery becomes an obstacle and the trunk through cannot be performed. There is a problem that the weight distribution between the front, rear, left and right of the vehicle body is deteriorated. In addition, since the luggage compartment becomes uneven due to the high-potential battery, the shape and size of luggage that can be loaded may be limited.
[0009]
Therefore, the present invention reduces the space in the luggage compartment in various hybrid vehicles such as sedans, minivans, and SUVs in which a high-potential battery for supplying power to the drive motor is disposed behind the rearmost seat of the vehicle. It is an object of the present invention to solve problems such as an inability to flatten a luggage compartment, an inability to carry out a trunk through, and a deterioration in weight distribution of a vehicle, and to be able to cope with various future seat arrangements.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is a hybrid vehicle including a power supply device having a high-potential battery for supplying power to a drive motor for driving a vehicle and a low-potential battery for supplying power to auxiliary devices of the vehicle. The high-potential battery is divided into a plurality of battery units, and the divided battery units and the low-potential battery are arranged behind the rearmost seat of the vehicle near both side walls of the vehicle body, and are arranged. A hybrid vehicle in which battery units are connected in series with each other is provided.
That is, the high-potential battery is divided into a plurality of battery units, and the thickness (depth) of each battery unit is reduced, and the weight of a single unit is also reduced. Therefore, each battery unit and the low-potential battery are distributed near both vehicle body side walls. This arrangement results in an increase in the volume behind the rearmost seat of the vehicle body, and facilitates trunk through. Also, if the battery units and the low-potential battery are arranged separately near both vehicle body side walls, the rear of the rearmost seat of the vehicle body becomes flat except for the battery unit and the low-potential battery arrangement part, so that Can be easily taken in and out. In addition, since the space behind the rearmost seat of the vehicle is flat except for the side wall of the vehicle body, a luggage space that can be used in a minivan or an SUV-based hybrid vehicle in accordance with various future seat arrangements can be provided.
Further, when the high-potential battery and the low-potential battery are disposed behind the rearmost seat of the vehicle, the conventional battery arrangement (the low-potential battery is disposed in the engine room, and the high-potential battery is disposed behind the rearmost seat of the vehicle). Since the length of the wiring is shorter than in the case of the arrangement, the resistance loss of the wiring is reduced, and the vehicle weight is reduced by the shortened wiring.
[0011]
The invention according to claim 2 provides a hybrid vehicle in which each of the batteries is arranged outside an interior wall.
In this case, the high-potential battery and the low-potential battery are covered by the interior wall, so that the appearance behind the rearmost seat of the vehicle is improved. In addition, the interior wall prevents contact between the luggage and each battery, thereby preventing mutual damage.
[0012]
The invention according to claim 3 includes a DC-DC converter that supplies power by stepping down from the high-potential battery to the low-potential battery, wherein the DC-DC converter is connected to at least one of the high-potential battery and the low-potential battery. It is an object of the present invention to provide a hybrid vehicle which is disposed close to and behind a rearmost seat of the vehicle.
By doing so, the length of the wiring connected to the DC-DC converter, the low-potential battery, and the high-potential battery is shortened, so that the resistance loss and weight due to the wiring are reduced.
[0013]
Further, the invention according to claim 4 provides a hybrid vehicle in which the negative terminal of each of the batteries is grounded to the vehicle body behind the rearmost seat of the vehicle. When the negative terminal of each battery is grounded to the vehicle body behind the rearmost seat of the vehicle in this manner, the negative wiring is greatly reduced, so that the resistance loss due to the wiring and the weight due to the wiring are reduced.
[0014]
The invention according to claim 5 provides a hybrid vehicle in which the + and-terminals of the high-potential battery face inward in the vehicle width direction.
In this way, wiring and maintenance for each battery can be facilitated.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a vehicle power supply device according to the present invention will be described with reference to the drawings.
[0016]
FIG. 1 is a configuration diagram of a sedan-type hybrid vehicle that runs by driving front wheels with a drive motor and an engine. As shown, the engine 2 and the drive motor 3 of the hybrid vehicle 1 are installed in an engine room 4 at the front of the vehicle, and an inverter 28 is connected to the drive motor 3.
[0017]
Various accessories such as a starter 6 of the engine 2, an air conditioner (not shown), an ignition switch (not shown), a headlight (not shown), an EPS (Electric Power Steering) 7, and a control unit 8 include a low-potential battery. 9, and the drive motor 3 is connected to the high-potential battery 10 via the inverter 28. The low-potential battery 9 and the high-potential battery 10 are installed in a trunk room 15 of the hybrid vehicle 1 and are connected to each other via a DC-DC converter 14 attached to the rear surface of a rear parcel 13.
[0018]
The high-potential battery 10 is divided into battery units 10a and 10b in which a plurality of modules having the same capacity and the same voltage in which a plurality of cells are electrically connected in series are further connected in series. It is connected. In this embodiment, the control unit 8 is attached to the DC-DC converter 14 to form a unit, but may be arranged separately.
[0019]
Next, the layout of the high-potential battery 10, the low-potential battery 9, the DC-DC converter 14, the control unit 8, and the like in the sedan hybrid vehicle 1 will be described with reference to FIGS.
[0020]
The battery units 10 a and 10 b of the high-potential battery 10 are arranged behind the rearmost seat S of the hybrid vehicle 1, that is, between one vehicle body side wall 16 and one interior wall 17 that define a trunk room 15, and , And the low-potential battery 9 is disposed between the other vehicle body side wall 18 and the other interior wall 19 that define the trunk room 15. To equalize the weight distribution, the battery unit 10a is disposed on the tire house 20, the battery unit 10b is disposed behind the tire house 20, and the low-potential battery 9 is connected to the battery unit 10b and the vehicle width. They are arranged at positions facing each other in the direction.
[0021]
In addition, wiring for connecting the low-potential battery 9 and the DC-DC converter 14, wiring for connecting the DC-DC converter 14 and the high-potential battery 10, and wiring for connecting the battery units 10a and 10b and the wiring box 10c. Are laid between one vehicle body side wall 16 and one interior wall 17, between the other vehicle body side wall 18 and the other interior wall 19, and on the back surface of the parcel 13. The negative terminal of the high-potential battery 10 and the negative terminal of the low-potential battery 9 are grounded to the vehicle body via ground wires in the periphery of the trunk room 15 of the vehicle body.
[0022]
By arranging the high-potential battery 10 and the low-potential battery 9 in the trunk room 15 in this way, the weight distribution in the hybrid vehicle 1 is optimized. When the low-potential battery 9 and the high-potential battery 10 are arranged outside the interior walls 17 and 19 and concealed, the external appearance is improved and the luggage accommodated in the trunk room 15 and the batteries 9 and 10 are separated. Contact is prevented and mutual damage due to contact is prevented. In addition, since the interior of the trunk room 15 is flat, luggage having different shapes and sizes can be easily loaded in the trunk room 15 and the work can be facilitated. In addition, since the capacity of the trunk room 15 is substantially larger than that of the conventional hybrid vehicle, it is possible to load large luggage. Further, since the rear seat can be turned over to a horizontal state, a long object can be mounted by a trunk through.
[0023]
Electrically, the low-potential battery 9, the high-potential battery 10, and the DC-DC converter 14 are close to each other and have short wiring lines for connecting each other, so that electrical resistance loss is reduced. Further, in terms of weight, the vehicle weight is reduced by the reduction in the length of the wiring.
[0024]
In the sedan vehicle, the hinge of the trunk lid (not shown) is disposed inside the interior wall 17 and the interior wall 19, so that the hinge can be opened and closed satisfactorily.
[0025]
4 to 6 show the layout of the high-potential battery 10, the low-potential battery 9, the DC-DC converter 14, and the like for the minivan and the SUV hybrid vehicle 25.
[0026]
Referring to FIGS. 4 to 6, the battery unit 10 a of the high-potential battery 10 is located behind the rearmost seat S of the hybrid vehicle 25, that is, between the vehicle body side wall 21 and the interior wall 22 of the luggage compartment 27. The battery unit 10b is disposed between the other vehicle body side wall 23 and the other and the interior wall 24.
[0027]
The two battery units 10a and 10b are arranged on the left and right tire houses 26 so as to be distributed to the left and right of the luggage compartment 27 in order to equalize the weight distribution of the hybrid vehicle 25. It is arranged close to the battery units 10a and 10b (in the illustrated example, between the other vehicle body side wall 23 and the other interior wall 24). In addition, the DC-DC converter 14 is provided between the vehicle body side wall and the interior wall opposite to the installation side of the low-potential battery 9 (in the illustrated example, one vehicle body) in order to equalize the weight distribution before and after the hybrid vehicle 25. (Between the side wall 21 and one interior wall 22). The battery units 10a and 10b are connected in series to the DC-DC converter 14 via a wiring box 10c, and the low-potential battery 9 is also connected in series to the DC-DC converter 14.
[0028]
Therefore, even in the case of a minivan or an SUV hybrid vehicle 25, the weight distribution can be equalized. In addition, since the luggage compartment 27 does not have unevenness due to the low-potential battery 9 and the high-potential battery 10, it is easy to put the luggage in and out and to trunk through. Further, since there is no restriction on the fall of the rear seat, various seat arrangements are possible. In addition, since the interior walls 22 and 24 cover the high-potential battery 10 and the low-potential battery 9, the appearance is improved, and the low-potential battery 9 and the high-potential battery 10 are prevented from contacting with the luggage to prevent mutual contact. Damage is prevented.
[0029]
Further, electrically, the low-potential battery 9, the high-potential battery 10, and the DC-DC converter 14 are close to each other, and the length of the wiring connecting the battery units 10a and 10b is shortened. Resistance loss and vehicle weight are reduced.
[0030]
In FIG. 1, the battery unit 10a may be disposed between one vehicle body side wall 16 and one interior wall 17, and the battery unit 10b may be disposed between the other vehicle body side wall 18 and the other interior wall 19. 5, the battery units 10a and 10b may be installed between one interior wall 22 and the vehicle body side wall 21, and the low-potential battery 9 may be installed between the other interior wall 24 and the vehicle body side wall 23.
[0031]
In addition, since the positive terminal and the negative terminal of the low-potential battery 9 and the high-potential battery 10 protrude inward in the vehicle width direction, wiring work and maintenance are excellent. The positive terminal and the negative terminal may be concave terminals.
[0032]
Next, the configuration and operation of the power supply device described above will be briefly described with reference to FIG.
[0033]
The control unit 8 is configured by a microcomputer such as an ECU including a CPU, a ROM, a RAM, and an I / O. The inverter 28 attached to the input side of the drive motor 3 includes a switching circuit (not shown) in which two switching elements (not shown) for controlling the driving force of the drive motor 3 are connected in series. I have.
[0034]
These switching elements are turned on / off by the control unit 8 when the drive motor 3 is driven, so that a DC current supplied from the high-potential battery 10 to the inverter 28 is converted into a three-phase AC current. The three-phase alternating current is supplied to the drive motor 3 via a three-phase wire.
[0035]
The inverter 28 converts the three-phase AC current generated by the drive motor 3 into a DC current by ON / OFF control of the control unit 8 during regenerative braking by the drive motor 3, and converts the converted DC current to the high-potential battery 10. Supply.
[0036]
An ON / OFF switch (contactor) is provided between the + side of the low-potential battery 9 and the DC-DC converter 14, and a ground connection between the − side terminal of the high-potential battery 10 and the vehicle body of the hybrid vehicle 1. A changeover switch (contactor) is interposed between the points, and the ON / OFF switch (contactor) and the changeover switch (contactor) are connected by wiring.
[0037]
In this power supply circuit, when the ON / OFF switch is turned ON, the low-potential battery 9 is electrically connected to the DC-DC converter 14, and the low-potential battery 9 is grounded to the vehicle body by switching the changeover switch. The battery 10 is connected, and the low-potential battery 9 is connected to the high-potential battery 10 via the DC-DC converter 14. When each switch is switched in this manner, the power of the high-potential battery 10 and the power of the low-potential battery 9 boosted by the DC-DC converter 14 can be supplied to the drive motor 3 (idle stop of the vehicle, Cruise mode).
It is also possible to charge the high-potential battery 10 directly from the drive motor 3 and the low-potential battery 9 from the drive motor 3 via the high-potential battery 10 and the DC-DC converter 14 (small-power regeneration mode). .
[0038]
On the other hand, the ON / OFF switch is turned OFF to electrically cut off the connection between the low-potential battery 9 and the DC-DC converter 14, and the changeover switch is switched so that the + terminal of the low-potential battery 9 and the- When the high-potential battery 10 is disconnected from the vehicle body by connecting the terminals, the low-potential battery 9 and the high-potential battery 10 are connected in series to the drive motor 3. The power obtained by adding the power of the battery 9 can be supplied to the drive motor 3 (start, assist mode). In addition, in this switching state, it is possible to charge each of the batteries 9 and 10 with a larger amount of power than in the above-described small-current regeneration mode (high-power regeneration mode).
[0039]
In the embodiment of the present invention, the high-potential battery 10 is described as being divided into two battery units 10a and 10b. However, the battery unit may be divided into three or more to make the battery unit thinner and lighter in unit weight. In this way, the battery unit is light and thin, so that the battery units can be distributed so that the weight distribution to the vehicle can be more evenly distributed. Further, the distance between the left and right vehicle body side walls 16, 18, 21, 23 and the interior walls 17, 19, 22, 24 can be reduced, so that the volume behind the rearmost seat S of the vehicle, such as a trunk room or a cabin, can be reduced. Can be expanded.
[0040]
As described above, the present invention can be variously modified within the scope of the technical idea, and it goes without saying that the present invention extends to the modified invention.
[0041]
【The invention's effect】
As described above, according to the present invention, the following effects are exhibited.
(1) The space behind the rearmost seat of the vehicle is substantially enlarged and flattened, so that the trunk through and luggage can be easily taken in and out. Further, it is possible to cope with various future seat arrangements. Further, the length of the wiring connecting the high-potential battery and the low-potential battery is shortened, the resistance loss due to the wiring is reduced, and the weight due to the wiring is reduced (claim 1).
[0042]
(2) Since the interior wall covers the high-potential battery and the low-potential battery, the appearance of the vehicle rearward from the rearmost seat of the vehicle is improved. In addition, the interior wall prevents contact between the luggage and each battery, thereby preventing damage due to mutual contact.
[0043]
(3) Since the wiring connected to the DC-DC converter, the low-potential battery, and the high-potential battery is shortened, the resistance loss of the wiring and the vehicle weight due to the wiring are reduced (claim 3).
[0044]
(4) Since the wiring on the negative side is greatly reduced, the resistance loss due to the wiring and the weight due to the wiring are reduced (claim 4).
[0045]
(5) Wiring and maintenance work for each battery can be facilitated (claim 5).
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a hybrid vehicle of a sedan system that travels by driving front wheels with a drive motor and an engine according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing an arrangement of a low-potential battery and a high-potential battery when a sedan hybrid vehicle is viewed from a side according to an embodiment of the present invention.
FIG. 3 is an explanatory view showing an arrangement of a low-potential battery and a high-potential battery when a vehicle body of a sedan hybrid vehicle is viewed from a rear side according to the embodiment of the present invention.
FIG. 4 is an explanatory view showing an arrangement of a low-potential battery and a high-potential battery when a minivan and an SUV-based hybrid vehicle are viewed from the side according to the embodiment of the present invention.
FIG. 5 is an explanatory view showing an arrangement of a low-potential battery and a high-potential battery when a minivan and an SUV hybrid vehicle are viewed from above according to an embodiment of the present invention.
FIG. 6 is an explanatory view showing an arrangement of a low-potential battery and a high-potential battery when a vehicle body of a minivan or an SUV hybrid vehicle is viewed from a rear side according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sedan hybrid vehicle 2 Engine 3 Drive motor 9 Low potential battery 10 High potential battery 10a Battery unit 10b Battery unit 14 DC-DC converter 16 One body side wall 17 One interior wall 18 The other body side wall 19 The other interior wall Reference Signs List 20 tire house 21 one body side wall 22 one interior wall 23 other body side wall 24 other body side wall 25 minivan, hybrid vehicle of SUV system 26 tire house S rearmost seat

Claims (5)

A hybrid vehicle including a power supply device having a high-potential battery that supplies power to a drive motor for driving the vehicle and a low-potential battery that supplies power to auxiliary devices of the vehicle,
The high-potential battery is divided into a plurality of battery units,
These divided battery units and the low-potential battery are arranged behind the rearmost seat of the vehicle near both side walls of the vehicle body,
A hybrid vehicle, wherein the plurality of battery units are connected in series with each other. The hybrid vehicle according to claim 1, wherein each of the batteries is disposed outside an interior wall. A DC-DC converter for supplying power by stepping down the power from the high-potential battery to the low-potential battery, wherein the DC-DC converter is arranged near at least one of the high-potential battery and the low-potential battery to close the rear of the vehicle. The hybrid vehicle according to claim 1, wherein the hybrid vehicle is disposed behind a rearmost seat. The hybrid vehicle according to claim 1, wherein the negative terminal of each of the batteries is grounded to a vehicle body behind a rearmost seat at the rear of the vehicle. The hybrid vehicle according to any one of claims 1 to 4, wherein each of the positive and negative terminals of the high-potential battery faces the inside in the vehicle width direction.

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