JPH09298806A - Power supply method for electric motor car and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and weight of a power supply equipment and moreover increase the discharge capacity and output by installing 2 kinds of storage batteries to electric motor cars and supplying power by selecting one of the batteries depending on the value of a discharge current requested. SOLUTION: A power supply equipment 1 for electric motor car has two kinds of storage batteries: a battery A with a large energy density, and a battery B with a large output density, and power can be supplied by selecting one of the batteries depending on the value of the discharge current requested. That is, if the detected information from discharge current detection means 10 exceeds a predetermined value, then a change-over switch SWa opens and a change-over switch Swb closes, power is supplied from the battery B to a load 4 and, if it is lower than the predetermined value, then the change-over switch SWb is opened, charge-over switch SWa is closed, and power is supplied from the battery A to the load 4. The switching of the batteries A and B is indicated on a power supply switching means 23. As started above, the compact, lightweight power source having large discharge power and output can be obtained for the electric motor car.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supplying electric power to an electric vehicle mounted on an electric vehicle such as an electric two-wheeled vehicle or an electric three-wheeled vehicle.

[0002]

2. Description of the Related Art For example, there is an electric vehicle equipped with a storage battery as an electric power source. In the electric vehicle, a motor is driven by the electric power of the storage battery and the vehicle is driven only by the driving force of the motor, or the human power and the motor are driven. There are things that run with the combined force of power.

The storage battery of an electric vehicle needs to be charged frequently, and a single charging system in which the storage battery is removed from the vehicle and an in-vehicle charging system in which the storage battery is mounted in the vehicle are used. The system allows charging.

[0004]

An electric vehicle equipped with such a storage battery has a limited discharge capacity of the storage battery, a short mileage, insufficient acceleration and climbing performance, and the storage battery increases the weight of the vehicle. I have a problem.

By the way, when one type of storage battery is used to solve the problems of these electric vehicles, the storage battery to be used has a large energy density but a small output density, which is necessary for acceleration and climbing. There is a problem that the weight and volume of the storage battery increase in order to satisfy the generated discharge current. Also, as the discharge characteristics of the storage battery used,
When the output density is high, but the energy density is low, there is a problem that the weight and volume of the storage battery similarly increase in order to satisfy the traveling distance.

[0006] Therefore, in the case of either storage battery, the amount of the on-board battery increases and the problem as the electric power source for the vehicle, that is, the problem that the traveling distance is long, the acceleration and climbing performance are good, and the vehicle weight is reduced. I couldn't be satisfied.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems and to provide a small-sized and light-weight electric power supply method and device for an electric vehicle that has a large discharge capacity and a large output. There is.

[0008]

In order to solve the above-mentioned problems and to achieve the object, a power supply method for an electric vehicle according to a first aspect of the present invention is such that an electric vehicle has a storage battery having a large output density and a large energy density. It is characterized in that two types of storage batteries, that is, storage batteries, are installed, and one of the two types of storage batteries is selected according to the magnitude of the required discharge current to supply electric power. To obtain a power source for an electric vehicle that is small and lightweight and has a large discharge capacity and output by selecting and discharging one of the two types of storage batteries according to the magnitude of the required discharge current of the electric vehicle. You can

A power supply method for an electric vehicle according to a second aspect of the present invention is characterized in that, when a large current is required such as when the electric vehicle starts or climbs a slope, electric power is supplied from a storage battery having a large output density. When a large current is required when starting an electric vehicle or climbing a hill, electric power is supplied from a storage battery having a large output density, so that it is small and lightweight, and acceleration and climbing performance are improved.

According to a third aspect of the present invention, there is provided a power supply method for an electric vehicle in which electric power is supplied from a storage battery having a large energy density when the electric vehicle is running at a constant speed after starting. When the electric vehicle is running at a constant speed after starting, electric power is supplied from a storage battery having a large energy density, so that the vehicle is small and lightweight, and the traveling distance is long.

According to a fourth aspect of the present invention, there is provided an electric vehicle power supply method in which an electric vehicle is equipped with the two types of storage batteries, and both storage batteries are discharged at the same time. It is characterized in that it is changed according to the depth of discharge of a storage battery having a large output density, and electric power is supplied from both of these two types of storage batteries. By changing the ratio of the discharge current of both storage batteries according to the discharge density of the storage battery with a large output density, and supplying power to the load from both of these two types of storage batteries, it is compact and lightweight, yet has a discharge capacity and output. It is possible to obtain a large electric power source for an electric vehicle.

According to a fifth aspect of the present invention, there is provided a power supply method for an electric vehicle, wherein 50% or less of the required discharge current from both storage batteries is charged to the storage battery having a large energy density, and 0 to 50.
The feature is that it is variable between%. By discharging electricity from both of two types of storage batteries to the load,
It is possible to obtain a power source for an electric vehicle that is small and lightweight, and that has a large discharge capacity and a large output.

According to a sixth aspect of the present invention, there is provided a power supply method for an electric vehicle, wherein an electric vehicle is equipped with a storage battery having a large output density and a storage battery having a large energy density, and the remaining capacity of the storage battery having a large output density is reduced. Charging is performed from the storage battery having a large energy density to the storage battery having a large output density. When the remaining capacity of a storage battery with a large output density decreases, by charging the storage battery with a large output density from a storage battery with a large energy density, the next start of an electric vehicle, when a large current is required such as when climbing a slope, Electric power can be supplied from a storage battery with a high output density, and it is small and lightweight, improving acceleration and climbing performance.

According to a seventh aspect of the present invention, there is provided a power supply method for an electric vehicle in which two types of storage batteries are mounted at a ratio suitable for the purpose of the electric vehicle. It is possible to obtain a small-sized and lightweight electric power source for an electric vehicle that has a large discharge capacity and a large output by mounting two types of storage batteries at a ratio suitable for the purpose of the electric vehicle.

According to another aspect of the present invention, there is provided a power supply device for an electric vehicle, comprising two types of storage batteries mounted on the electric vehicle: a storage battery having a large output density and a storage battery having a large energy density; A control means for selecting one of the two types of storage batteries and supplying power according to the magnitude of the required discharge current. By selecting and discharging one of two types of storage batteries according to the size of the load of the electric vehicle, a simple power supply device can be used to provide a small and lightweight power supply for electric vehicles that has a large discharge capacity and output. Obtainable.

In a power supply device for an electric vehicle according to a ninth aspect of the present invention, the control means selects a storage battery having a large output density to supply electric power when a large current is required such as when the electric vehicle starts or climbs a slope. It is characterized by that. When a large current is required when starting an electric vehicle or climbing a slope, electric power is supplied from a storage battery having a large output density. Therefore, a simple power supply unit is small and lightweight, and acceleration and climbing performance is improved.

In the power supply device for an electric vehicle according to the tenth aspect, the control means supplies electric power by selecting a storage battery having a large energy density when the electric vehicle is running at a constant speed after starting. Is characterized by. When the electric vehicle is running at a constant speed after starting, electric power is supplied from a storage battery having a large energy density. Therefore, a simple power supply device is used to reduce the size and weight of the vehicle and to increase the traveling distance.

An electric power supply system for an electric vehicle according to claim 11 is characterized in that the two types of storage batteries mounted on the electric vehicle, a discharge ratio setting means for setting a ratio of simultaneous discharge from both storage batteries, and both storage batteries. Control means for changing the discharge current ratio of one of the storage batteries according to the depth of discharge of the storage battery having a large output density when setting the discharge current ratio from the two storage batteries, and supplying electric power to the load from both of the two types of storage batteries. Is characterized by. By changing the ratio of the discharge current of one storage battery according to the depth of discharge of the storage battery with a large output density, and supplying power to the load from both of these two types of storage batteries, a simple power supply device is small and lightweight, Moreover, it is possible to obtain an electric vehicle power source having a large discharge capacity and a large output.

In the electric power supply system for an electric vehicle according to claim 12, the control means sets 50% or less of the required discharge current from both storage batteries to the storage battery having a large energy density based on the setting of the discharge ratio setting means. And 0 to 50
The feature is that it is variable between%. By supplying electric power to the load from both of the two types of storage batteries, it is possible to obtain a small-sized and lightweight electric power source for an electric vehicle that has a large discharge capacity and a large output with a simple power supply device.

According to a thirteenth aspect of the present invention, there is provided a power supply device for an electric vehicle in which electric power is supplied from a storage battery having a large output density and a storage battery having a large energy density, which are mounted on the electric vehicle, and the two types of storage batteries depending on the required discharge current. Supply means, a remaining capacity detection means for detecting the remaining capacity of a storage battery having a large output density, and the discharge capacity of the storage battery having a large output density is reduced, the storage battery having a large energy density from the storage battery having a large output density. And a charging means for charging the storage battery. When the remaining capacity of a storage battery with a large output density decreases, the storage battery with a large energy density charges the storage battery with a large output density, so that a large current such as when the electric vehicle is next started or when climbing a slope is generated with a simple power supply device. When necessary, power can be supplied from a storage battery with a large output density,
It is small and lightweight, which improves acceleration and climbing performance.

A power supply device for an electric vehicle according to a fourteenth aspect is characterized in that the two types of storage batteries are mounted in a ratio suitable for the purpose of the electric vehicle. It is possible to obtain a power source for an electric vehicle that is equipped with two types of storage batteries in a ratio suitable for the purpose of the electric vehicle and is small and lightweight with a simple power supply device and has a large discharge capacity and a large output.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the electric power supply method for an electric vehicle and the device storage thereof according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an electric vehicle power supply apparatus, and FIG. 2 is a flow chart showing an operation of the first embodiment of the electric vehicle power supply apparatus.

The power supply device 1 for an electric vehicle is mounted on an electric vehicle and includes two types of storage batteries A and B, which are a storage battery A having a large energy density and a storage battery B having a large output density. The two types of storage batteries A and B are discharged to supply power.

As the storage battery A having a large energy density,
For example, there are Ni-MH batteries, Li-ion batteries, fuel cells, solar cells, etc., and a storage battery A having a large energy density is required in terms of traveling distance and weight. Further, as the storage battery B having a large output density, there are, for example, a lead battery (bipolar), a Ni-Cd battery, a capacitor, etc., and the storage battery B having a large output density of the battery in terms of acceleration and climbability.
is required.

A series circuit 2 of the storage battery A and the changeover switch SWa, a series circuit 3 of the storage battery B and the changeover switch SWb,
The load 4 and the series circuit 5 of the power switch SW1 and the charging switch SW2 are connected in parallel.

The load 4 may be a motor or the like.
At the time of charging, the charger 7 is connected via the connector 6. In addition, in FIG. 1 and FIG. 2, the discharge and the charge are collectively described for convenience.

When the electric vehicle is stopped and, for example, charging is performed at night, the charger 7 is connected via the connector 6, and if the charging switch SW2 is manually closed, the changeover switch SWa and the changeover switch SWa are controlled under the control of the controller 8 constituting the control means. The storage batteries A and B are charged by closing the changeover switch SWb and manually opening the changeover switch SW1. Changeover switch SW
A current sensor 9 is connected between a and the changeover switch SWb, and this current information is input to the discharge current detecting means 10 of the controller 8 to detect the required discharge current.

A voltage sensor 11a is connected in parallel to the storage battery A, a voltage sensor 11b is connected in parallel to the storage battery B, and this voltage information is input to the battery voltage detection means 12 of the controller 8.

Further, the controller 8 is provided with a power supply switching means 21 and a discharge stopping means 22, and the power supply switching means 21 switches the changeover switch SWa when the current information from the discharge current detecting means 10 exceeds a predetermined value. Power is supplied from the storage battery B to the load 4, and when the value is not more than a predetermined value, the changeover switch SWb is opened and the changeover switch SWa is closed to supply power from the storage battery A to the load 4. In this way, one of the two types of storage batteries A and B is selected according to the magnitude of the required discharge current to supply power, and the switching between the storage batteries A and B is displayed on the power source switching display means 23. It

Further, the discharge stopping means 22 is operated when the voltage information from the battery voltage detecting means 12 is inputted and the voltages of the respective storage batteries A and B become equal to or lower than a predetermined value (end voltage) and stops the electric vehicle. At the same time, the discharge stop warning means 24 is driven. As the discharge stop warning means 24, a warning lamp or a warning buzzer can be used.

Next, the control of the controller 9 will be described based on the flowchart of FIG. At the time of starting the electric vehicle, both the changeover switch SWa and the changeover switch SWb are closed, and in step a1, if the power switch SW1 is manually closed at the time of start, discharging is started. In step b1, the electric vehicle starts and the storage batteries A and B detected by the current sensor 9 by the load 4 for climbing uphill.
If the required discharge current It for is 10 A or more, the changeover switch SWa is turned off, and the changeover switch SWb
Is on, the storage battery B having a high output density is discharged (step c1). At this time, it is determined in step d1 whether or not the voltage Vb of the storage battery B having a high output density detected by the voltage sensor 11b is equal to or lower than the final voltage V0. If the voltage is not lower than the final voltage V0, the process proceeds to step b1 to discharge. Step i1
(Step e1).

When the electric vehicle starts running and the required discharge current is 10 A or less (step b)
1), the changeover switch SWb is turned off, the changeover switch SWa is turned on, and the storage battery A having a large energy density is discharged (step f1). At this time,
In step f1, it is determined whether or not the voltage Va of the storage battery A detected by the voltage sensor 11 is equal to or lower than the final voltage V1, and when the voltage Va of the storage battery A is equal to or lower than the final voltage V1, discharging is finished (step h1). If it is not lower than the cutoff voltage V1, the process proceeds to step b1 to discharge.

During the repetition of starting, running and stopping of the electric vehicle, the storage battery A having a large energy density and the storage battery B having a large output density are switched to discharge the storage battery A and the storage battery B. . When the remaining capacity of the storage battery A decreases and the battery voltage reaches the final voltage, the discharging ends in step h1. Similarly, when the capacity of the storage battery B decreases and the battery voltage reaches the final voltage, the discharging ends in step e1. Then, the electric vehicle stops traveling.

As described above, by selecting and discharging one of the two types of storage batteries A and B in accordance with the magnitude of the required discharge current of the electric vehicle, a simple power supply device is provided which is small and lightweight, Moreover, it is possible to obtain an electric vehicle power source having a large discharge capacity and a large output.

In addition, when a large current is required such as when starting an electric vehicle or climbing a hill, the storage battery B having a large output density is selected to supply electric power. Is improved. Furthermore, when the electric vehicle is running at a constant speed after starting, the storage battery A having a large energy density is selected to supply electric power. Therefore, the simple power supply device is small and lightweight, and the traveling distance is long.

When the electric vehicle stops running, the charger 7 is connected through the connector 6 for charging at night, for example, and the controller 8 controls the changeover switches SWa and SWb to be closed and the charge switch SW2 to be manually changed. Close,
Similarly, the storage batteries A and B are charged by manually opening the power switch SW1 (step i1). In this way, after stopping traveling, the storage batteries A and B are charged using the charger 7.
Charging is performed, the electric vehicle is allowed to run again, and the chargers 7 optimally charge the storage batteries A and B (step j1).

FIG. 3 is a block diagram showing the schematic construction of a second embodiment of the electric vehicle power supply apparatus, and FIG. 4 is a flow chart showing the operation of the second embodiment of the electric vehicle power supply apparatus.

In the electric vehicle power supply system 1 of the second embodiment, the same components as those of the first embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted.

The controller 8 of the electric vehicle power supply system 1 of the second embodiment is provided with a discharge current integration means 30, a discharge depth calculation means 31, and a discharge current ratio setting means 32. The discharge current information is input from the ammeter 33 connected in series to the storage battery B to the discharge current integration means 30, and the discharge current information is integrated. The discharge depth calculation means 31 calculates the discharge depth of the storage battery B from the integration of the discharge current. Discharge rate setting means 3
2 indicates that both storage batteries A, from the calculation information of the depth of discharge of the storage battery B,
The ratio of simultaneous discharge from B is set, and both storage batteries A and B are set.
When setting the discharge current ratio from the one storage battery, the discharge current ratio of one storage battery is changed according to the depth of discharge of the storage battery having a large output density, and electric power is supplied to the load from both of the two types of storage batteries. In this way, the ratio of the discharge current of one storage battery is
It changes according to the depth of discharge of a storage battery with a large output density,
By supplying electric power to the load from both of these two types of storage batteries, it is possible to obtain a small-sized and lightweight electric power source for an electric vehicle having a large discharge capacity and a large output with a simple power supply device.

In this embodiment, the discharge current ratio setting means 3
Based on the setting of 2, one of the storage batteries A bears 50% or less of the total discharge current of the discharges from both storage batteries A and B, and 0 to
It is variable between 50%. In this way, the discharge current ratio of the two storage batteries A and B is calculated as follows.
These two types of storage batteries A,
By supplying electric power to the load from both B, it is possible to obtain a small-sized and lightweight electric power source for an electric vehicle that has a large discharge capacity and a large output with a simple power supply device.

Next, the control of the controller 8 will be described based on the flowchart of FIG. In step a2, when the power switch SW1 is manually closed, discharging is started (step b2), and the storage battery A and the storage battery B are discharged while the vehicle is repeatedly started, running, and stopped.

Depth of discharge C of storage battery B having a large output density C
P, that is, Y having a predetermined value of the discharge capacity to the nominal capacity
% Or less (step c2), and when Y% or less, that is, when the storage battery B has a sufficient capacity, the storage battery A having a large energy density is 30% of the required discharge current It.
The battery B is discharged, and the storage battery B is discharged by 70% (step c2).
In step e2, the discharge capacities of the storage battery B are integrated to obtain the storage battery B
The discharge depth CP of is calculated. In step f2, it is determined whether the battery voltages Va and Vb of any of the storage batteries A and B are equal to or lower than the final voltages Va0 and Vb0. If either is not equal to or lower than the final voltage, the process proceeds to step c2.

In step c2, when the depth of discharge CP of the storage battery B is Y% or more, that is, when the remaining capacity of the storage battery B is small, the storage battery A discharges 50% of the required discharge current It in step g2, and the storage battery B is discharged. B discharges 50%. In step h2, the discharge capacity of the storage battery B is integrated, and the discharge depth CP of the storage battery B is calculated. Step i2
Then, it is determined whether or not the battery voltages Va and Vb of any of the storage batteries A and B are equal to or lower than the final voltages Va0 and Vb0. If neither is equal to or lower than the final voltage, the process proceeds to step b2.

When either of the storage batteries A, B reaches the final voltage Va0, Vb0 in step f2, the discharge is terminated in step j2 and the electric vehicle stops running.

Then, in step k2, the charger 7 is connected to start charging the storage battery A and the storage battery B, and in step l2 the charging is completed to enable traveling. Also, step i2
And either of the storage batteries A, B has a final voltage of Va0, Vb0.
In the same manner, the discharge is ended in step m2, the electric vehicle stops traveling, the charger 7 is connected in step n2 to start charging the storage battery A and the storage battery B, and the charging is ended in step o2. It becomes possible to run.

As described above, the ratio of the discharge currents of both storage batteries A and B is changed according to the depth of discharge of the storage batteries having a large output density, and electric power is supplied to the load from both of these two types of storage batteries. , Small size and light weight with simple power supply,
Moreover, it is possible to obtain a power supply for an electric vehicle having a large discharge capacity and a large output.

Further, based on the setting of the discharge current ratio setting means 32, 50% or less of the required discharge current is set as a burden on the storage battery A having a large energy density, and the storage battery A is made variable between 0 and 50%. By supplying electric power to the load from both B, it is possible to obtain a small and lightweight electric power source for an electric vehicle having a large discharge capacity and a large output by a simple power supply device.

FIG. 5 is a block diagram showing the schematic construction of the third embodiment of the electric vehicle power supply apparatus, and FIG. 6 is a flow chart showing the operation of the third embodiment of the electric vehicle power supply apparatus.

In the electric power supply system 1 for an electric vehicle of the third embodiment, the same components as those of the embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted. In the electric vehicle power supply device 1 of the third embodiment, a DC / DC converter 50 is connected between a storage battery A and a storage battery B, and when the remaining capacity of the storage battery B having a large output density decreases, energy It is configured such that it can be charged from the storage battery A having a high density.

When the remaining capacity of the storage battery B having a large output density decreases, the charge control means 51 of the controller 8 causes the storage battery A having a large energy density to charge the storage battery B having a large output density, and a simple power source. When a large current is required by the device, such as when the electric vehicle is next started or when climbing a hill, electric power can be supplied from the storage battery B having a large output density, which is small and lightweight, and acceleration and climbing performance are improved.

Next, the control of the controller 8 will be described based on the flowchart of FIG. In step a3, when the power switch SW1 is manually closed, discharging is started. When the required discharge current It for the storage batteries A and B by the load 4 for starting and climbing the electric vehicle is 10 A or more (step b3), the changeover switch S is selected in step c3.
Wb is turned on, and storage battery B having a high output density is discharged. When the voltage Vb of the storage battery B becomes equal to or lower than the final voltage V4 (step d3), discharging is stopped at step e3.

When the electric vehicle starts running and the required discharge current It becomes 10 A or less at step b3, the storage battery A having a large energy density is obtained at step f3.
If the voltage Va is lower than a certain threshold voltage V1, the changeover switch SWb is turned off in step g3,
The changeover switch SWa is turned on and the storage battery A is discharged. When the voltage Va of the storage battery A becomes equal to or lower than the final voltage V2 (step h3), discharging is stopped at step i3.

If the voltage Va of the storage battery A having a large energy density is higher than a certain threshold voltage V1 in step f3, the changeover switches SWa and SWb are turned on in step j3.
The storage battery A is discharged, and the storage battery B starts to be charged. Threshold voltage V with voltage Va of storage battery A
When it is larger than 1 (step k3), when the voltage Vb becomes the charging stop voltage V3 due to the charging of the storage battery B in step l3, the charging of the storage battery B is stopped (step m3).

When the voltage Va of the storage battery A is smaller than a certain threshold voltage V1 in step k3, the storage battery A is discharged and the charging of the storage battery B is stopped in step n3. Storage battery A
When the voltage Va of the voltage becomes equal to or lower than the final voltage V2 (step o
3), the discharge is stopped in step p3.

When the discharging is stopped in steps e3 and p3, the storage batteries A and B are charged in step q3, and when the charging is completed, the vehicle is ready to run (step r).
3).

Although the discharge stop of the storage batteries A and B is controlled by the final voltage, when the discharge capacity is integrated and the set discharge amount is reached,
A method of stopping the discharge is also possible, and this method is not easily affected by other factors such as temperature and state of charge and has good accuracy.

Further, the electric vehicle power supply device 1 is equipped with two types of storage batteries A and B in a ratio suitable for the purpose of the electric vehicle, so that the electric power supply device 1 is small in size and light in weight with a simple power supply device and has a discharge capacity and an output. It is possible to obtain a large electric power source for an electric vehicle.

[0059]

As described above, the first and the eighth aspects are provided.
According to the invention described above, one of two types of storage batteries is selected and discharged according to the magnitude of the required discharge current of the electric vehicle. Therefore, the electric power for an electric vehicle is small and lightweight and has a large discharge capacity and a large output. You can get the source.

According to the second and ninth aspects of the present invention, when a large current is required such as when the electric vehicle is starting or climbing a slope, electric power is supplied from a storage battery having a large output density.
It is compact and lightweight, and can improve acceleration and climbing performance.

According to the third and tenth aspects of the present invention, when the electric vehicle is driven at a constant speed after starting, electric power is supplied from a storage battery having a large energy density, so that the vehicle is small and lightweight and has a long traveling distance. Can be long.

In the inventions according to claims 4 and 11, the ratios of the discharge currents of the two types of storage batteries are changed in accordance with the discharge densities of the storage batteries having large output densities, and the load from both of the two types of storage batteries is changed. (F) Since electric power is supplied, it is possible to obtain a small and lightweight electric power source for an electric vehicle that has a large discharge capacity and a large output.

According to the fifth and the twelfth aspects of the invention, 50% or less of the required discharge current from both storage batteries is a burden on the storage battery having a large energy density and is variable between 0 and 50%. Since electric power is supplied by discharging the load from both of the storage batteries, it is possible to obtain a small and lightweight electric power source for an electric vehicle that has a large discharge capacity and a large output.

According to the sixth and thirteenth aspects of the present invention, when the remaining capacity of the storage battery having a large output density decreases, the storage battery having a large energy density charges the storage battery having a large output density. When a large amount of current is required, such as when starting or climbing the next time, power can be supplied from a storage battery with a large output density, and it is small and lightweight.
Acceleration and climbing performance can be improved.

In the inventions according to claims 7 and 14, since two types of storage batteries are mounted in a ratio suitable for the purpose of use of the electric vehicle, the power source for the electric vehicle is small and lightweight and has a large discharge capacity and a large output. Can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an electric vehicle power supply device.

FIG. 2 is a flowchart showing the operation of the first embodiment of the electric vehicle power supply system.

FIG. 3 is a block diagram showing a schematic configuration of a second embodiment of the electric vehicle power supply device.

FIG. 4 is a flowchart showing an operation of the second embodiment of the electric vehicle power supply system.

FIG. 5 is a block diagram showing a schematic configuration of a third embodiment of an electric vehicle power supply device.

FIG. 6 is a flowchart showing the operation of the third embodiment of the electric vehicle power supply system.

[Explanation of symbols]

 1 Electric Power Supply Device for Electric Vehicle 2 Series Circuit of Storage Battery A and Changeover Switch SW 3 Series Circuit of Storage Battery B and Changeover Switch SWb 4 Load 5 Series Circuit of Load 4 and Power Switch SW1 7 Charger 8 Controller 9 Current Sensor SWa Changeover Switch SWb selector switch A storage battery B storage battery

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H02J 7/00 H02J 7/00 X 302 302C

Claims (14)

[Claims] 1. An electric vehicle equipped with two types of storage batteries, a storage battery having a large output density and a storage battery having a large energy density, and one of the two storage batteries is selected according to the required discharge current. A power supply method for an electric vehicle, comprising: 2. A power supply method for an electric vehicle according to claim 1, wherein when a large current is required such as when the electric vehicle starts or climbs a slope, electric power is supplied from a storage battery having a large output density. 3. The electric power supply method for an electric vehicle according to claim 1, wherein electric power is supplied from a storage battery having a large energy density when the electric vehicle is running at a constant speed after starting. 4. An electric vehicle equipped with the above-mentioned two types of storage batteries, and these two storage batteries are discharged simultaneously, and the ratio of the discharge current of both storage batteries at the time of discharging is determined according to the depth of discharge of the storage battery having a large output density. A power supply method for an electric vehicle, which is changed and power is supplied from both of these two types of storage batteries. 5. 50% of the required discharge current from both storage batteries
The following is a load of the storage battery having a large energy density, and is variable between 0 and 50%.
The electric power supply method for an electric vehicle according to claim 1. 6. An electric vehicle, and a storage battery having a high output density,
When a storage battery with a large energy density is installed and the remaining capacity of the storage battery with a large output density is reduced, charging is performed from the storage battery with a large energy density to the storage battery with a large output density. Vehicle power supply method. 7. The storage battery according to claim 1, wherein two types of storage batteries are mounted at a ratio suitable for use in an electric vehicle.
The electric power supply method for an electric vehicle according to any one of 1. 8. An electric vehicle equipped with two types of storage batteries, a high output density storage battery and a high energy density storage battery, current detection means for detecting a required discharge current, and 2 according to the required discharge current. A power supply device for an electric vehicle, comprising: a control unit that supplies power by selecting one of two types of storage batteries. 9. The electric motor according to claim 8, wherein the control means supplies a power by selecting a storage battery having a high output density when a large current is required such as when the electric vehicle starts or climbs a slope. Vehicle power supply device. 10. The control means supplies power by selecting a storage battery having a large energy density when the electric vehicle is running at a constant speed after starting.
A power supply device for an electric vehicle as described. 11. A storage battery installed in an electric vehicle, a discharge ratio setting means for setting a ratio of simultaneous discharge from both storage batteries, and one storage battery when setting a discharge current ratio from both storage batteries. The electric power supply apparatus for an electric vehicle, comprising: a control unit configured to change the discharge current ratio of the storage battery according to the depth of discharge of a storage battery having a large output density to supply electric power to a load from both of the two types of storage batteries. 12. The control means sets the required discharge current of 50 from both storage batteries based on the setting of the discharge ratio setting means.
The electric power supply device for an electric vehicle according to claim 11, wherein the load of the battery having a large energy density is less than or equal to%, and is varied between 0 and 50%. 13. A storage battery having a large output density and a storage battery having a large energy density, which is mounted on an electric vehicle, a control means for supplying electric power from the two types of storage batteries according to the magnitude of a required discharge current, and a large output density. Remaining capacity detection means for detecting the remaining capacity of the storage battery, and charging means for performing charging from the storage battery with large energy density to the storage battery with large output density when the discharge capacity of the storage battery with large output density is reduced. An electric power supply device for an electric vehicle, comprising: 14. The electric power supply apparatus for an electric vehicle according to claim 8, wherein the two types of storage batteries are mounted in a ratio suitable for the purpose of use of the electric vehicle.