JP2909326B2 - Charging device for small electric vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery and a power supply.
A battery charger that artificially connects and disconnects the battery, and when the actual charging voltage reaches a predetermined voltage value set in advance with respect to the target charging voltage of the battery, a constant low current is supplied to the battery. The present invention relates to a charging device for a small-sized electric vehicle including a constant-current / constant-time charging means for supplying and charging for a set time.

[0002]

2. Description of the Related Art Conventionally, in a charging device for a small electric vehicle of this type, when charging an on-board battery, when charging by a constant voltage system or a constant current system, first, a battery terminal is used. After a predetermined voltage is applied, the battery is charged with a small current for a predetermined time set by a timer or the like.
It was trying to secure a percentage of charge.

[0003]

However, in the above-mentioned method, when the battery is used in a moderately used state, that is, when the battery is charged in a discharged state, the charged amount with respect to the discharged amount is appropriately maintained, but the battery is hardly discharged. When charging is repeated with, for a certain period of time set by a timer, etc.
Since the charging operation is performed, the battery is overcharged, and the battery is damaged and the life of the battery is shortened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a charging apparatus for a small electric vehicle that can prevent overcharging when a battery is charged with a small amount of discharge.

[0005]

A charging device for a small electric vehicle according to the present invention is connected to a battery and a power source and connected to a power source.
It is equipped with a charger that artificially disconnects,
The actual charging voltage relative to the target charging voltage of the battery
Reaches a predetermined voltage value set in advance, the battery
A constant current that charges the battery by supplying a constant low current for a set time
This is a charging device for a small electric vehicle equipped with a fixed time charging means.
Te, a discharge amount integrating means for integrating the amount of discharge from the battery after charging, the accumulated discharge amount by comparing the accumulated discharge amount and the predetermined discharge amount value detected by the discharge amount integrating means the predetermined discharge A specified discharge amount detection means for detecting whether or not the amount is equal to or more than a value, and prohibiting charging the battery until the integrated discharge amount exceeds the predetermined discharge amount value based on a detection result of the specified discharge amount detection means, A charge determination unit for allowing charging of the battery when the integrated discharge amount exceeds the predetermined discharge amount value; The operation and effect of this characteristic configuration are as follows.

[0006]

In other words, the amount of discharge of the battery after charging is detected, and the detected amount of discharge is integrated. If the integrated amount of discharge is smaller than a predetermined amount of discharge, overcharging is prevented.
Charging to the battery is prohibited by the charging possibility determination means.

[0007]

Therefore, even if an attempt is made to charge a battery that has not been used much after charging, that is, a battery that has not been sufficiently discharged, the charging is prohibited.
The battery can be prevented from being overcharged due to being improperly charged, and problems such as damage to the battery and shortening of its life can be solved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a small electric vehicle. This small electric vehicle has front wheels 2, which are steered by operating a steering handle 1,
And a pair of left and right rear wheels 4 and 4 driven by the electric motor 3.
Is supported by the vehicle body frame 5, and a seat 6, a pair of left and right batteries 7, 7, and a control device 8 are provided on the upper side of the rear wheels 4, 4.

As shown in FIGS. 1 and 2, the charging of the batteries 7, 7 is performed by a charger 9 disposed in a space between the two batteries 7, 7 arranged in parallel. This charger 9
Is artificially connected to a commercial AC power supply as shown in FIG.
They are connected and disconnected, and are connected to the terminals of the batteries 7,7. In the charger 9, when the actual charging voltage reaches a predetermined voltage value with respect to the target charging voltage of the batteries 7, 7 so that the battery 7, 7 is charged to a predetermined charging amount. 7 is provided with a constant current / constant time charging means 10 for supplying a constant small current for a set time and charging. Then, a voltage value between terminals of the resistor R interposed in a circuit between the batteries 7, 7 and a load device such as the electric motor 3 is detected, and the electric motor 3
And the like, that is, a discharge amount integrating means 11 for detecting a current supply amount to a load device, that is, a discharge amount of the batteries 7,7. The discharge amount integrating means 11 constantly detects the voltage across the resistor R to detect the discharge amount of the batteries 7, 7 with time, and integrates the discharge amount after the batteries 7, 7 are charged. It is configured to be. Each time the batteries 7 are charged, the discharge amount integrating means 11 is set to an initial state so that the integration starts from zero. Then, the integrated discharge amount information integrated by the discharge amount integration unit 11 is input to the specified discharge amount detection unit 12, and is compared with a predetermined discharge amount value set in the specified discharge amount detection unit 12. The integrated discharge amount by the specified discharge amount detecting means 12 and a predetermined discharge amount
Comparison with coulometric value, wherein when the accumulated discharge amount is smaller than a predetermined discharge amount value <br/> from prescribed discharge amount detecting means 12,
A prohibition signal is output to the charge permission signal generating means 13, and when the integrated discharge amount is larger than the predetermined discharge amount value , a permission signal is output from the specified discharge amount detection means 12 to the charge permission signal generating means 13. . Then, the prescribed discharge amount detecting means 12
When a prohibition signal is input from the controller, the charging permission signal generating means 1
3 switches the charging circuit of the constant current constant time charging means 10 of the charger 9 to an off state to disable charging,
When a permission signal is input from the prescribed discharge amount detecting means 12,
The charge permission signal generating means 13 is a constant current constant time charging means 10
The charging circuit is turned on to enable charging.
The predetermined discharge amount value is assumed to be close to a predetermined voltage value for starting charging from a full charge state of the batteries 7, 7 at a preset small current for a certain period of time under normal conditions such as temperature. When the battery terminal voltage is set to the amount and the battery terminal voltage is lower than the predetermined voltage value at the start of charging, the charger 9 is configured to perform charging as usual. Here, the prescribed discharge amount detection means 12 and the charge permission signal generation means 13 constitute a charge permission / prohibition determination means 14.

With the above configuration, even if the small electric vehicle travels a small amount after the batteries 7 and 7 are fully charged and the amount of discharge from the batteries 7 and 7 is extremely small, the above-described chargeability determination is made. Since the charging is prohibited by the means 14, it is possible to prevent the battery 7, 7 from being unduly overcharged and damaging or shortening its life.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram showing a battery, a charger, and means for avoiding overcharging of a battery.

FIG. 2 is an overall side view showing a small electric vehicle.

[Explanation of symbols]

 Reference Signs List 7 Battery 9 Charger 10 Constant current constant time charging means 11 Discharge amount integrating means 12 Specified discharge amount detecting means 14 Chargeability determining means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60L 11/18 H02J 7/00 H02J 7/04 H02J 7/10

Claims (1)

(57) [Claims] 1. Connection to a battery (7) and a power supply
And a charger (9) for artificially canceling the connection, and when the actual charging voltage reaches a predetermined voltage value with respect to a target charging voltage of the battery (7), the battery ( 7) A charging device for a small electric vehicle comprising a constant current / constant time charging means (10) for supplying a constant small current for a set time and charging the battery, wherein the amount of discharge from the battery (7) after charging is A discharge amount integrating means for integrating, and comparing the integrated discharge amount detected by the discharge amount integrating means with a predetermined discharge amount value to determine whether the integrated discharge amount is equal to or greater than the predetermined discharge amount value A specified discharge amount detecting means (12) for detecting the discharge, and the specified discharge amount detecting means (12)
Based on the detection result, charging of the battery (7) is prohibited until the integrated discharge amount exceeds the predetermined discharge amount value. When the integrated discharge amount exceeds the predetermined discharge amount value, the battery (7) is charged. Charging permission / non-permission judging means (1)
4) A charging device for a small electric vehicle, wherein