JPH06245397A - Output controller for battery - Google Patents

Abstract

PURPOSE:To prevent completely stop by warning when a residual capacity meter of a motor operated vehicle with a storage battery becomes a predetermined low capacity, lowering a maximum load through a controller, closing a reuse switch to a light load, and traveling a position capable of charging it. CONSTITUTION:A residual capacity meter 102 of a storage battery 101 is provided in an electric motor vehicle or a scooter which travels with the battery 101. When the battery is lowered to a predetermined low capacity, a warning unit 107 is operated to stop the vehicle. A controller 103 switches a maximum load to a low load by a governor mechanism 104, closes a reuse switch 106, and travels at a low speed up to a charging place or a storage battery replacing place. Thus, complete stop is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an output control device for a battery of a device such as an electric vehicle whose main power source is a battery.

[0002]

2. Description of the Related Art Conventionally, a device whose main power source is a battery is
There was a limit to the amount of energy that could be used, so there was a limit to its use. In particular, there was a problem at the end of the output capacity of the battery during use of the device. In many devices that do not measure the remaining capacity information, the output of the devices suddenly stops without a warning regarding the end of battery capacity. Also, as seen in JP-A-2-143181 having a battery residual capacity meter,
In advanced equipment, the remaining capacity meter was displayed in different colors at the end of the battery capacity, and a sound alarm was issued.

[0003]

However, in the prior art, when the alarm is issued, the energy is already
At the end. Also, if you want to give an alarm before the end,
In the case of only the warning by light, it may be ignored and the equipment may be stopped without additional energy supply. Even if the alarm is not reached, if the device is left with a small amount of energy stored in the battery, the remaining capacity of the battery may be terminated due to self-discharge of the battery. Especially when a large moving body such as an electric vehicle stops at the end of energy, it is often difficult to replenish energy. As described above, the conventional technique has a problem that the residual energy is suddenly terminated.

[0004]

The battery of the present invention for solving the problems is (1) measuring the remaining amount of the battery, and when the remaining amount becomes a certain low value, the main output of the equipment used. To stop.

(2) The device can be used by connecting the reuse switch after the output of the used device is stopped.

(3) An alarm for a certain period is issued before the output is stopped.

(4) When the remaining amount becomes a certain low value, the maximum output of the equipment used is reduced.

[0008]

In the present invention, the energy of the battery is distinguished from the main part and the spare part, and when the main part is finished, the output of the device using the battery is temporarily stopped. In order to use the reserve part of the energy of the battery, a special switch for reuse must be connected, and the user strongly recognizes that the remaining amount is low. It has a remaining capacity meter to distinguish the energy in the battery, and when the remaining capacity falls below a certain standard, it is used as reserve energy. This ensures that the device is replenished with energy without stopping unexpectedly during use. In the case of an electric vehicle, there is a strong recognition of the remaining capacity of the energy, and at the time of recognition, a small amount of drive / driving can be performed with reserve energy, so the vehicle will not stop at a place where the battery cannot be charged during traveling, and You can drive to a place where you can recharge and stop operation.

If the control device suddenly stops the used device regardless of the intentions of the user and the driver, work is being performed, and in the case of an electric vehicle, the running state is disturbed. Therefore, a warning is given for a certain period before the stop. As a result, the user / driver performs preliminary actions for stopping in advance, and there is no hindrance to work / running.

In general, when the discharge output of a battery is increased, the power that can be taken out decreases. It is considered that this is due to an increase in internal resistance accompanying an increase in current. Therefore, it is necessary to reduce the discharge output in order to increase the work amount of the equipment used and extend the traveling distance of the electric vehicle.

Particularly in a state where the reserve energy is used and the remaining capacity is small, when the output is extremely increased, the equipment used may stop. According to the present invention, by limiting the output in the reserve energy use region where the remaining capacity is small, the electric vehicle or the like can be easily moved to a rechargeable place.

[0012]

EXAMPLES The present invention will be described below based on examples.

(Example) An electric scooter having a sealed lead battery was used as an example. FIG. 1 is a conceptual diagram of a control system of an electric scooter using the battery output control device of the present invention. A lead battery 101 has a voltage of 48 V and a capacity of 30 Ah when discharged at a rate of 5 hours. The battery capacity was measured by equipping the battery with the remaining capacity meter 102, and 25 Ah out of the total capacity was defined as the main energy and 5 Ah as the reserve energy. Electric power from the battery is input to the control circuit 103 and output to the electric motor 105 according to an instruction from the speed control mechanism 104 such as an accelerator. Reuse switch 1 for control circuit
06 is connected. Alarm device 107 for the remaining capacity meter
Are connected.

An urban driving test was conducted at a maximum speed of 30 km. When the main energy of 24Ah has been consumed due to the consumption of energy by running the scooter, the self-discharge of the battery, or the decrease of the battery capacity due to the change of the battery temperature, the warning device built in the remaining capacity meter gave a warning. . When 25 Ah was consumed, the output to the electric motor was stopped by the control circuit and the running was stopped. By turning on the reuse switch, it became possible to run again.

A maximum current of 100 A flowed during acceleration until 25 Ah of main energy was consumed. Maximum current of 5 when using reserve energy with continuous reuse switch
The output was reduced and limited by limiting it to 0A. Due to this, 1.7 km / Ah when main energy is used
The mileage per energy was 2 km / Ah, and the mileage increased. Therefore, it became possible to move to a rechargeable place after a warning that the remaining capacity of the main energy had decreased. However, as a result of limiting the output, driving performance such as acceleration was inferior.

By using the present invention, it becomes possible to sufficiently drive the electric vehicle without stopping in the place where charging is not possible.

Comparative Example In order to verify the effectiveness of the present invention, as a comparative example, a control device obtained by omitting the battery energy dividing mechanism from the battery control device of this embodiment was mounted on an electric scooter. Since the battery energy split mechanism was abolished, the reuse switch, the alarm device when the main energy decreased, and the output control mechanism when the reserve energy was used would naturally not work.

The same scooter of this comparative example was subjected to the same urban running test as in the above-mentioned example. As a result, although the energy can be confirmed by the remaining capacity meter, the energy was consumed in places where it could not be charged, and the scooter stopped.

The electric vehicle has been described above.
It is obvious that this control mechanism is effective when used for general electric equipment in which charging and battery replacement are not so easy.

[0020]

EFFECT OF THE INVENTION By using the battery output control device of the present invention having the above-described structure, it is possible to eliminate the suddenness of termination of residual energy and to easily perform charging and battery replacement.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a control system of an electric scooter using the battery output control device of the present invention.

[Explanation of symbols]

 101 Storage Battery 102 Remaining Capacity Meter 103 Control Circuit 104 Speed Control Mechanism 105 Electric Motor 106 Reuse Switch 107 Alarm Device

Claims (4)

[Claims] 1. An output control device for a battery, which measures the remaining amount of the battery and stops the main output of the equipment used when the remaining amount reaches a certain low value. 2. The battery output control device according to claim 1, wherein the device can be used by connecting a reuse switch after the output of the used device is stopped. 3. The battery output control device according to claim 1, wherein an alarm for a certain period is issued before the output is stopped. 4. The battery output control device according to claim 1, wherein the maximum output of the device used is reduced when the remaining amount becomes a constant low value.