JP2006020424A - Power supply device and motor-driven vehicle having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more simplify the configuration of a power supply device when the power supply device has a battery which can supply power to a motor and an auxiliary machine with a plurality of secondary cells connected in series. <P>SOLUTION: The power supply device 1 includes the battery 14 which can supply power to the motor 7 and the auxiliary machine 12 with the plurality of secondary cells 14a connected in series. The rated voltage V2 of the auxiliary machine 12 is set lower than the rated voltage V1 of the motor 7. The terminal voltage BV2 of each cell 14a is set to the rated voltage V2 of the auxiliary machine 12 or lower. The power supply device 1 includes a selector 18 which can select at least one cell 14a from a battery 14a group. The power is supplied to the auxiliary machine 12 by the selected cell 14a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power supply apparatus including a battery having a plurality of secondary batteries connected in series and capable of supplying power to an electric motor and an auxiliary machine, and an electric vehicle including the power supply apparatus. .

  Conventionally, there are those shown in Patent Documents 1 and 2 below for the power supply device and the electric vehicle equipped with the power supply device.

  According to the thing of the said patent document 1, the electric vehicle provided with the said power supply device was connected in series with the electric motor which can output driving force for driving | running | working, and auxiliary machines, such as a lighting device which assists driving | running | working drive. A battery having a plurality of secondary batteries and capable of supplying electric power to the electric motor and the auxiliary machine is provided, and the rated voltage of the auxiliary machine is set lower than the rated voltage of the electric motor.

  Then, when the electric power is supplied from the battery to the electric motor, the electric motor outputs a driving force. Then, with this driving force, the wheels are rotated and the vehicle can travel. In addition, a part of the output voltage of the battery is reduced by the DC-DC converter, and the electric power is supplied to the auxiliary machine.

  On the other hand, according to the thing of the said patent document 2, the charge rate equalization apparatus which controls each battery so that the value of the charge rate (synonymous with a charge condition (SOC)) of each battery in a battery may become equal mutually. Is provided.

Japanese Patent No. 3240020 Japanese Patent No. 3304777

  By the way, in the above-mentioned patent document 1, the DC-DC converter interposed between the battery and the auxiliary machine has many components such as an output voltage control circuit in addition to the switching circuit, and the configuration is complicated. . For this reason, the structure of the said power supply device is complicated.

  On the other hand, when the battery is used for a long period of time, each battery deteriorates, and the charge rate values tend to be unequal with each other based on the temperature and characteristics. If the battery continues to be used in this state, the temperature of some of the above battery group whose degree of deterioration has progressed and the charging rate has become lower rises rapidly during charging and output. This causes the inconvenience that the deterioration proceeds rapidly.

  Here, the battery generally has a structure in which it is difficult to replace only some of the batteries with new ones when deterioration of some of the batteries progresses. For this reason, as described above, when deterioration of some of the batteries progresses, it is necessary to replace the batteries with new ones as a whole. That is, there is a problem that the life of the battery is unnecessarily deteriorated due to deterioration of some of the batteries.

  Therefore, it is conceivable to apply the charge rate equalizing device of Patent Document 2 to the battery group in Patent Document 1. In this way, the charge rate values of the batteries are equalized. Therefore, it is considered that the above problem is solved.

  However, as described above, the configuration of the charging rate equalizing apparatus is complicated. For this reason, when such a device is applied, there arises a problem that the configuration of the power supply device becomes complicated.

  The present invention has been made paying attention to the above-described circumstances, and an object of the present invention is to provide a power supply device having a plurality of secondary batteries connected in series and supplying power to an electric motor and an auxiliary machine, respectively. When the battery which can supply is provided, it is to make the structure of the said power supply device simpler.

  Another object of the present invention is to achieve unnecessary deterioration of the battery with a simple configuration.

The invention of claim 1 includes a battery 14 having a plurality of secondary batteries 14a connected in series and capable of supplying power to the electric motor 7 and the auxiliary machine 12, respectively, from the rated voltage V1 of the electric motor 7. In the power supply device in which the rated voltage V2 of the auxiliary machine 12 is lowered,
A selection device 18 is provided for setting the terminal voltage BV2 of each battery 14a to be equal to or lower than the rated voltage V2 of the auxiliary machine 12, and selecting at least one battery 14a from the group of batteries 14a. Electric power is supplied to the auxiliary machine 12.

  In addition to the invention of claim 1, the invention of claim 2 is such that the selection device 18 selects a high charge rate battery 14a having a higher charge rate value from the group of batteries 14a.

  In addition to the invention of claim 1, the invention of claim 3 is a selection device 18 that makes it possible to select a low charge rate battery 14 a having a lower charge rate value from the group of batteries 14 a and the selected low charge. The other generator 11 which can supply electric power to the rate battery 14a is provided.

  According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, a part of the batteries 14a1-m in the battery 14a1-n group is selected by the selection device 18. is there.

  According to a fifth aspect of the present invention, the power supply device 1 according to the first aspect is provided, and the driving force for traveling is output by the electric motor 7.

  In this section, the reference numerals appended to the above terms are not to be construed as limiting the technical scope of the present invention to the section “Example” described later or the contents of the drawings.

  The effects of the present invention are as follows.

The invention of claim 1 includes a battery having a plurality of secondary batteries connected in series and capable of supplying power to the electric motor and the auxiliary machine, respectively, and the rating of the auxiliary machine is higher than the rated voltage of the electric motor. In a power supply with a reduced voltage,
A selection device is provided that allows the terminal voltage of each battery to be equal to or lower than the rated voltage of the auxiliary machine, and allows at least one battery to be selected from the battery group, and supplies power to the auxiliary machine by the selected battery. I have to.

  For this reason, the supply of electric power to the auxiliary machine is achieved by using some of the batteries selected by the selection device in the battery group of the batteries. And the said selection apparatus can obtain the switching circuit with a simple structure as a main structure compared with the DC-DC converter in a prior art, for example. Therefore, the configuration of the power supply device can be simplified.

  According to a second aspect of the present invention, a high charge rate battery having a higher charge rate value is selected from the battery group by the selection device.

  For this reason, when the battery is used, if the value of each battery charge rate is unequal, a high charge rate battery is selected and output to supply power to the auxiliary machine as described above. Be made.

  Therefore, it is possible to prevent the charge rate of the high charge rate battery from being lowered and the charge rate of each battery to be uneven. As a result, the battery is prevented from being deteriorated unnecessarily.

  Further, as described above, in order to prevent the respective charging rates of the respective batteries from becoming uneven, it is not necessary to apply a charging rate equalizing apparatus having a complicated configuration in the conventional technology.

  Therefore, prevention of unnecessary deterioration of the battery described above can be achieved with a simple configuration. Further, as described above, the power supply device can be reduced in weight because the charge rate equalizing device is unnecessary.

  According to a third aspect of the present invention, there is provided a selection device capable of selecting a low charge rate battery having a lower charge rate value from the battery group, and another power generation capable of supplying power to the selected low charge rate battery. Machine.

  For this reason, when the charge rate value of each battery is unequal due to the use of the battery, a low charge rate battery is selected as described above and is charged by the other generator. The

  Therefore, it is possible to prevent the charging rate of the low charging rate battery from being increased and the charging rates of the respective batteries from becoming uneven. As a result, the battery is prevented from being deteriorated unnecessarily.

  In a fourth aspect of the present invention, a part of the battery group is selected by the selection device.

  Here, it is assumed that, for example, the temperature environment around the other battery in the battery is favorable. In this case, the battery in the other part is unlikely to become the high and low charge rate battery. Therefore, as described above, the other batteries are excluded from the selection targets by the selection device, and some of the batteries are selected by the selection device.

  As a result of the above, since the number of selection targets of the selection device is reduced, the configuration of the selection device can be simplified. That is, the configuration of the power supply device can be simplified.

  According to a fifth aspect of the present invention, the power supply device according to the first aspect is provided, and the driving force for traveling is output by the electric motor.

  For this reason, the structure of this electric vehicle can be simplified by applying the said power supply device to an electric vehicle.

  When the power supply apparatus according to the present invention includes a plurality of secondary batteries connected in series and includes a battery that can supply power to the electric motor and the auxiliary machine, In order to achieve the object of making the configuration simpler, the best mode for carrying out the present invention is as follows.

  That is, the power supply device includes a battery having a plurality of secondary batteries connected in series and capable of supplying electric power to the electric motor and the auxiliary machine, respectively, and the rated voltage of the auxiliary machine is higher than the rated voltage of the electric motor. The voltage is low. A selection device is provided that allows the terminal voltage of each battery to be equal to or lower than the rated voltage of the auxiliary machine, and allows at least one battery to be selected from the battery group, and power is supplied to the auxiliary machine by the selected battery. Is done.

  In order to explain the present invention in more detail, the first embodiment will be described with reference to FIG.

  In FIG. 1, symbol A is a hybrid electric vehicle exemplified by an automobile.

  The electric vehicle A includes a power supply device 1 as a driving device for traveling. The power supply device 1 includes an internal combustion engine 2 supported by a vehicle body, a motor / generator 4 linked to the internal combustion engine 2 via a clutch 3, and a transmission 5 linked to the motor / generator 4. ing.

  The motor / generator 4 is integrally provided with an electric motor 7 and a generator 8. The electric motor 7 outputs a driving force to wheels connected to the transmission 5. On the other hand, the generator 8 is driven mainly by the internal combustion engine 2 and outputs electric power.

  The internal combustion engine 2 is connected to a starter motor 10 and another generator 11. The power supply device 1 includes an auxiliary machine 12. The auxiliary machine 12 is, for example, a headlight lamp, an air conditioning compressor, a wind regulator motor, or the like.

  The rated voltage V1 of the electric motor 7 and the generator 8 is 288V. The rated voltage V2 of the starter motor 10, the other generator 11, and the auxiliary machine 12 is 12V, and the rated voltage V2 of the auxiliary machine 12 is set to be considerably lower than the rated voltage V1 of the electric motor 7.

  A battery 14 that can supply electric power to the electric motor 7, the starter motor 10, and the auxiliary machine 12 is provided. In this case, the electric motor 7 is connected to the battery 14 via a motor control unit 16, and the battery 14 is charged by supplying power from the generator 8. The battery 14 includes a plurality of first to n-th batteries 14a1-n connected in series. Each of these batteries 14a is a secondary battery. The terminal voltage BV1 of the battery 14 is 288 V, which is the same as the rated voltage V1 of the electric motor 7. The terminal voltage BV2 of each battery 14a is set to 12V, which is the same as the rated voltage V2 of the auxiliary machine 12, respectively.

  The terminal voltage BV2 of each battery 14a may be equal to or lower than the rated voltage V2 of the auxiliary machine 12. For example, the rated voltage V2 of the battery 14a may be 6V or 3V that is lower than the rated voltage V2 of the auxiliary machine 12. The rated voltage V2 of the auxiliary machine 12 may be 24V, and the terminal voltage BV2 of the battery 14a may be 24V, 12V, 8V, or the like.

  A selection device 18 is provided that enables selection of at least one desired battery 14a from the group of batteries 14a1-n. In this case, a part of the batteries 14a1-m in the battery 14a1-n group is selected as the selection device 18 and the other battery 14an is excluded from the selection target.

  The battery 14a selected by the selection device 18 supplies power to the starter motor 10 and the auxiliary machine 12 at 12V that matches the rated voltage V2. At the time of this power supply, the battery 14a1-n group maintains the series state as it is, and the terminal voltage BV1 of the battery 14 is maintained at 288V.

  If the terminal voltage BV2 of the battery 14a is, for example, 6V (or 4V), the selection device 18 selects two batteries 14a (or three batteries 14a) in a series circuit, and the terminals The voltage is 6V × 2 = 12V (or 4V × 3 = 12V) that matches the rated voltage V2 of the starter motor 10 and the auxiliary machine 12.

  The selection device 18 inputs a charge rate measurement unit 19 that detects each charge rate (0-100%) of each of the batteries 14a1-m and a detection signal of the charge rate measurement unit 19, A determination unit 20 that determines whether or not the detection signal matches a predetermined one, and a predetermined battery 14a is selected from the partial batteries 14a1-m based on the determination result of the determination unit 20. The selection unit 21 that connects the selected battery 14a to the auxiliary machine 12 and supplies power to the auxiliary machine 12 from the battery 14a, and the power supply from the battery 14a to the auxiliary machine 12 includes the selection. And a capacitor 22 that prevents momentary interruption during the selection operation of the unit 21.

  The charging rate measuring unit 19 measures the voltage between the terminals of each of the batteries 14a1-n to measure the charging rate. In this case, at least one of the current during charging, the current during output, and the temperature of each battery 14a1-n is detected, and the measured value by the charge rate measuring unit 19 is corrected. Also good.

  The selection device 18 selects a high charge rate battery 14a having a higher charge rate value (for example, 70% or more) from the partial battery 14a1-m group. Then, the selected high charge rate battery 14 a is connected to the auxiliary machine 12 by the selection unit 21, and power is supplied from the high charge rate battery 14 a to the auxiliary machine 12.

  In addition, a low charge rate battery 14a having a lower charge rate value (for example, 30% or less) than the battery 14a1-m can be selected by the selection device 18. And the electric power can be supplied from the other generator 11 to the low charge rate battery 14a selected by the selection device 18 at 12V.

  In addition, as shown by a one-dot chain line in FIG. 1, at least one desired battery 14 a may be selected by the selection device 18 from all the batteries 14 a 1 -n of the battery 14. The other generator 11 may not be provided.

According to the said structure, it has the battery 14 which has the some secondary battery 14a connected in series, and can supply electric power to the electric motor 7 and the auxiliary machine 12, respectively, rather than the rated voltage V1 of the said electric motor 7 In the power supply device in which the rated voltage V2 of the auxiliary machine 12 is lowered,
A selection device 18 is provided for setting the terminal voltage BV2 of each battery 14a to be equal to or lower than the rated voltage V2 of the auxiliary machine 12, and selecting at least one battery 14a from the group of batteries 14a. Electric power is supplied to the auxiliary machine 12.

  For this reason, the supply of electric power to the auxiliary machine 12 is achieved by using a part of the batteries 14 a selected by the selection device 18 in the battery 14 a group of the batteries 14. The selection device 18 can obtain, for example, a switching circuit with a simple configuration as a main configuration, compared to a DC-DC converter in the prior art. Therefore, the configuration of the power supply device 1 can be simplified.

  Further, as described above, the selection device 18 selects the high charge rate battery 14a having a higher charge rate value from the battery 14a group.

  For this reason, the use of the battery 14 selects the high charge rate battery 14a to supply power to the auxiliary machine 12 as described above when the values of the charge rates of the batteries 14a are unequal. And output.

  Therefore, the charging rate of the high charging rate battery 14a is reduced, and each charging rate of each battery 14a is prevented from becoming uneven. As a result, the battery 14 is prevented from being deteriorated unnecessarily.

  In addition, as described above, in order to prevent the charging rates of the batteries 14a from becoming uneven, it is not necessary to apply a charging rate equalizing apparatus having a complicated configuration according to the conventional technology.

  Therefore, prevention of unnecessary deterioration of the battery 14 described above can be achieved with a simple configuration. Further, as described above, the power supply device 1 can be reduced in weight because the charge rate equalizing device is unnecessary.

  In addition, as described above, the selection device 18 that enables selection of the low charge rate battery 14a having a lower charge rate value from the group of the batteries 14a, and power can be supplied to the selected low charge rate battery 14a. The other generator 11 is provided.

  For this reason, when the battery 14 is used so that the values of the charging rates of the batteries 14a are unequal, the low charging rate battery 14a is selected as described above, and the other generators are selected. 11 is charged.

  Therefore, it is possible to prevent the charging rate of the low charging rate battery 14a from being increased and the charging rates of the respective batteries 14a from becoming uneven. As a result, the battery 14 is prevented from being deteriorated unnecessarily.

  Further, as described above, some of the batteries 14a1-m in the battery 14a1-n group are selected by the selection device 18.

  Here, for the other battery 14an in the battery 14a1-n, for example, it is assumed that the surrounding temperature environment is in a favorable condition. In this case, the other battery 14a is unlikely to become the high and low charge rate battery 14a. Therefore, as described above, the other battery 14an is excluded from the selection target by the selection device 18, and a part of the batteries 14a1-m are selected by the selection device 18.

  As a result, since the number of selection targets of the selection device 18 is reduced, the configuration of the selection device 18 can be simplified. That is, the configuration of the power supply device 1 can be simplified.

  In addition, as described above, the power supply device 1 according to the first aspect is provided, and the driving force for traveling is output by the electric motor 7.

  For this reason, by applying the power supply device 1 to the electric vehicle A, the configuration of the electric vehicle A can be simplified.

  In addition, although the above is based on the example of illustration, you may provide the selection apparatus 18 which each selects the said high and low charge rate battery 14a separately.

  FIG. 2 below shows a second embodiment. The second embodiment is common in many respects to the configuration and operational effects of the first embodiment. Therefore, regarding these common items, common reference numerals are attached to the drawings, and redundant description thereof is omitted, and different points are mainly described. In addition, the configuration of each part in this embodiment may be variously combined in light of the object and operational effects of the present invention.

  In order to explain the present invention in more detail, Example 2 will be described with reference to FIG.

  In FIG. 2, the electric vehicle A is a straddle-type vehicle that is a motorcycle.

  The electric vehicle A is supported by a vehicle body 25, a front wheel 26 that is steerably supported by a front portion of the vehicle body 25, a rear wheel 27 supported by a rear portion of the vehicle body 25, and the vehicle body 25. The power supply device 1 that enables the rear wheel 27 to be driven to travel is provided.

  The power supply device 1 includes an electric motor 7 that drives the rear wheel 27 and a battery 14 that supplies electric power to the electric motor 7. The battery 14 is charged by a separate power source. The battery 14 is detachably supported by a support portion 28 provided on the vehicle body 25. The battery 14 supported by the support portion 28 is connected to the electric motor 7 and the auxiliary machine 12 by a wire harness without going through the vehicle body 25 (floating state). The battery 14 includes two (n = 2) batteries 14a.

  The rated voltage V1 of the motor 7 is 24V, the rated voltage V2 of the auxiliary machine 12 is 12V, the terminal voltage BV1 of the battery 14 is 24V, and the terminal voltage BV2 of the battery 14a is 12V.

  As described above, the battery 14 has only two batteries 14a. For this reason, the charging rate measurement unit 19 and the determination unit 20 in the selection device 18 can be simply a voltage comparator. Moreover, a general-purpose relay can be simply used for the selection unit 21. Therefore, the configuration of the power supply device 1 can be extremely simple and lightweight.

  As a result, it is extremely beneficial to use the power supply device 1 particularly for the saddle riding type vehicle A in which the extra space is narrow and light weight is strongly required.

1 is a block diagram illustrating an electric power supply device according to a first embodiment. FIG. FIG. 9 is a side view of the entire saddle type vehicle according to the second embodiment.

Explanation of symbols

A Electric vehicle 1 Power supply device 2 Internal combustion engine 7 Electric motor 8 Generator 11 Other generator 12 Auxiliary machine 14 Battery 14a Battery 18 Selection device V1 Rated voltage V2 Rated voltage BV1 Terminal voltage BV2 Terminal voltage

Claims (5)

In a power supply apparatus having a plurality of secondary batteries connected in series and having a battery capable of supplying electric power to an electric motor and an auxiliary machine, respectively, wherein the rated voltage of the auxiliary machine is lower than the rated voltage of the electric motor ,
A selection device is provided that allows the terminal voltage of each battery to be equal to or lower than the rated voltage of the auxiliary machine, and allows at least one battery to be selected from the battery group, and supplies power to the auxiliary machine by the selected battery. A power supply device characterized by that.   2. The power supply device according to claim 1, wherein a high charge rate battery having a higher charge rate value is selected from the battery group by the selection device.   A selection device that enables selection of a low charge rate battery having a lower charge rate value from the battery group, and another generator that can supply power to the selected low charge rate battery. The power supply device according to claim 1.   The power supply apparatus according to any one of claims 1 to 3, wherein a part of the battery group is selected by the selection device.   An electric vehicle comprising the power supply device according to claim 1, wherein a driving force for traveling is output by the electric motor.

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