JP3061361U - Control device for battery charger - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reliably prevent charging in a state where the liquid level of a battery is low, and to avoid early deterioration and explosion of the battery. A power plug unit connected to a commercial power supply, a power outlet unit connected to a power plug of a battery charger, and an open connection connected between the power plug unit and the power outlet unit. An opening / closing control unit 5 that opens and closes a power line 4 between the power plug unit 2 and the power outlet unit 3 by a signal So or a close signal, a liquid level sensor 6 that detects a liquid level Lf of the battery B, and the liquid level sensor 6 A liquid level detecting unit 7 is provided that, when detecting that the liquid level Lf has dropped below the set reference level Ls, gives the opening signal So to the opening / closing control unit 5 and opens the power supply line 4.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a control device for a battery charger suitable for being connected to a battery charger for charging a battery mounted on an electric construction machine or the like.

[0002]

[Background and issues]

 Generally, an electric construction machine operated by a battery as well as an electric vehicle is known.

[0003] In this type of electric construction machine, it is necessary to charge the battery with a battery charger after using the electric construction machine for a predetermined period of time. Insert the power plug of the unit into the power outlet of the commercial power supply.

[0004] By the way, the battery needs to contain a specified amount of battery liquid (electrolyte), and if charging is repeated in a state where the liquid level of the battery liquid is lowered, deterioration of the battery is only accelerated. In addition, there is a possibility that explosion may be caused by generation of hydrogen gas. Usually, in order to avoid this problem, the worker checks the liquid level before performing the charging work, and replenishes the battery fluid when the liquid level is low. Actually, it is difficult to avoid this problem reliably due to forgetting to check the inspection.

The present invention solves the problem based on such a background, and can reliably prevent charging in a state where the liquid level of a battery is low, thereby avoiding early deterioration and explosion of the battery. It is an object of the present invention to provide a battery charger control device as described above.

[0006]

Means and Embodiments for Solving the Problems

 The control device 1 for a battery charger according to the present invention includes a power plug unit 2 connected to a commercial power supply, a power outlet unit 3 connected to a power plug Ca of the battery charger C, and a power plug unit 2 and a power outlet unit 3. And an open / close control unit 5 that opens and closes a power line 4 between the power plug unit 2 and the power outlet unit 3 by an applied open signal So or close signal, and a liquid level sensor 6 that detects a liquid level Lf of the battery B. If the liquid level sensor 6 detects that the liquid level Lf is lower than the set reference level Ls, the liquid level detecting section 6 gives an open signal So to the opening / closing control section 5 to open the power line 4. 7 is provided. In this case, according to a preferred embodiment, it is desirable to provide a notification unit 8 for notifying that the power supply line 4 has been opened.

Thus, in use, the power plug Ca of the battery charger C is connected to the power outlet 3, the liquid level sensor 6 is attached to the battery B, and the power plug 2 is connected to a commercial power supply. For example, the liquid level sensor 6 detects the liquid level Lf of the battery B, and the detection result is provided to the liquid level detecting unit 7. When the liquid level sensor 6 detects that the liquid level Lf has dropped below the reference level Ls, an open signal So is given from the liquid level detecting section 7 to the opening / closing control section 5, and the power plug section 2 and the power outlet The power supply line 4 between the sections 3 is opened. Therefore, when the liquid level Lf of the battery B to be charged is low, the power supply to the battery charger C is forcibly cut off by the battery charger control device 1 according to the present invention, and the battery is charged. Charging in a state where the liquid level Lf of B is lowered is reliably prevented. The opening of the power supply line 4 is reported by the reporting unit 8.

[0008]

【Example】

 Next, a preferred embodiment according to the present invention will be described in detail with reference to the drawings.

First, the configuration of the battery charger control device 1 according to the present embodiment will be described with reference to FIGS.

The battery charger control device 1 includes a casing 10 shown in FIGS. 2 and 3. Reference numeral 2 denotes a power plug unit connected to a commercial power source, 3 denotes a power outlet unit connected to a power plug Ca (see FIG. 5) of a battery charger C, and a power cord 11 connected to the power plug unit 2 The power cord 13 connected to the power outlet unit 3 is attached to and detached from the casing 10 via a connector 14. Further, a series circuit of the fuse 15, the power supply line 4, and the open / close control unit 5 is connected between the connector 12 and the connector 14. In this case, the opening / closing control unit 5 has, for example, a function of opening and closing the power supply line 4 in response to an opening signal So or a closing signal provided from the liquid level detecting unit 7 described later, for example, incorporating a relay or the like. Further, the input side of the DC power supply unit 16 is connected to the power supply line 4. The DC power supply unit 16 has a function of converting an AC input from the power supply line 4 into a DC output and supplying power to each unit of the battery charger control device 1.

On the other hand, reference numeral 7 denotes a liquid level detecting unit which is connected to a liquid level sensor 6 for detecting the liquid level Lf of the battery B on the input side, and has a liquid level alarm LED (light emitting diode) on the output side. (Iodine) 17 and the opening / closing controller 5 are connected. In this case, as shown in FIG. 4, the liquid level sensor 6 includes a detection electrode 18 for detecting the liquid level Lf, a screw portion 20 to be attached to and detached from the liquid supply port Bo of the battery B, a knob portion 21, and a cable connected to the detection electrode 18. 22 are provided together. Therefore, the cap 31 (see FIG. 5) is removed from the liquid supply port Bo of the battery B, and the screw portion 20 of the liquid level sensor 6 is screwed into the screw hole of the liquid supply port Bo as shown in FIG. For example, the liquid level sensor 6 can be attached to the battery B. The liquid level alarm LED 17 constitutes the notification unit 8. As the notification unit 8, an audible notification unit such as a chime or a voice may be used in addition to the LED. Further, the detection of the liquid level Lf is performed based on the presence or absence of a voltage generated when the detection electrode 18 of the liquid level sensor 6 comes into contact with the battery liquid. As the liquid level sensor, any sensor including switches capable of detecting the liquid level Lf, such as a float switch, can be used.

On the other hand, reference numeral 23 denotes a voltage detection unit, and a positive terminal clip 24 and a negative terminal clip 25 are connected to the input side of the voltage detection unit 23. In this case, the cord 26 of the terminal clip 24, the cord 27 of the terminal clip 25, and the cable 22 of the liquid level sensor 6 are connected via a detachable connector 28 provided on the casing 10 to the voltage detecting section 21 and the liquid level detecting section. 7 respectively. The output side of the voltage detection unit 23 is connected to a voltage alarm LED (light emitting diode) 29. Thus, the voltage detection unit 23 turns on the voltage alarm LED 29 when the voltage of the battery B is lower than the specified value.

Next, a method of using and operation of the battery charger control device 1 according to the present embodiment will be described with reference to FIG.

In FIG. 5, B is a battery, Bp is a positive electrode terminal, Bn is a negative electrode terminal, 31... Indicate caps attached to the liquid supply ports Bo. The embodiment shows a case in which two batteries B, B are connected in series. A negative terminal Bn of one battery B and a positive terminal Bp of the other battery B are connected by a connection cord 32. C is a battery charger, and a power plug Ca of the battery charger C is connected to a power outlet unit 3 of the battery charger control device 1. The positive and negative charging codes Cp and Cn of the battery charger C are connected to the positive terminal Bp of one battery B and the negative terminal Bn of the other battery B, respectively.

On the other hand, the liquid level sensor 6 of the battery charger control device 1 is attached to the battery B. The embodiment shows a case in which two liquid level sensors 6 and 6 are provided, and the liquid level sensors 6 and 6 are attached to the two batteries B and B, respectively. In this case, when one of the liquid level sensors 6 detects that the liquid level Lf has dropped below the reference level Ls, the liquid level detecting section 7 outputs an open signal So. Therefore, the number of the liquid level sensors 6 is arbitrary, and may be one or two or more. Further, the positive terminal clip 24 is connected to the positive terminal Bp of one battery B, and the negative terminal clip 25 is connected to the negative terminal Bn of the other battery B.

If the power switch (not shown) is turned on while the power plug unit 2 is connected to the commercial power source or the power plug unit 2 is connected to the commercial power source, the liquid level sensor 6 will be connected to the batteries B ... Is detected, and the detection result is provided to the liquid level detection unit 7. If the liquid level Lf of the batteries B is equal to or higher than the reference level Ls, that is, in a normal state, a closing signal is given from the liquid level detecting section 7 to the opening / closing control section 5, and the power plug section 2 and the power outlet are connected. The power supply line 4 between the units 3 is closed (on). Therefore, the commercial power is supplied to the battery charger C via the battery charger control device 1, and the batteries B can be charged.

On the other hand, if the liquid level sensor 6 detects that the liquid level Lf of the batteries B has dropped below the reference level Ls, an opening signal So is given from the liquid level detecting section 7 to the opening / closing control section 5, The power line 4 between the power plug unit 2 and the power outlet unit 3 is opened (off). Therefore, when the liquid level Lf of the batteries B to be charged is abnormally low, the supply of the commercial power to the battery charger C is forcibly cut off by the battery charger control device 1, and The notification unit 8 notifies the worker that the power supply line 4 has been opened. Therefore, charging in a state where the liquid level Lf of the batteries B is lowered is reliably prevented, and early deterioration and explosion of the batteries B are avoided.

Although the embodiment has been described in detail above, the present invention is not limited to such an embodiment, but deviates from the gist of the present invention in the detailed configuration, shape, quantity, used parts, and the like. You can arbitrarily change, add, or delete as long as you do not.

[0019]

[Effect of the invention]

 As described above, the battery charger control device according to the present invention includes a power plug connected to the commercial power supply, a power outlet connected to the power plug of the battery charger, and a power plug connected between the power plug and the power outlet. An open / close control unit that opens and closes a power line between a power plug unit and a power outlet unit in response to an open signal or a close signal applied thereto; a liquid level sensor that detects a liquid level of a battery; When it detects that the level of the battery has dropped below the set reference level, it has a liquid level detector that sends an open signal to the open / close controller and opens the power line. It has a remarkable effect that charging is reliably prevented, and thus early deterioration and explosion of the battery can be avoided.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a control device for a battery charger according to a preferred embodiment of the present invention;

FIG. 2 is an external plan view of the battery charger control device,

FIG. 3 is an external front view of the battery charger control device;

FIG. 4 is a side view of a liquid level sensor used in the battery charger control device;

FIG. 5 is a connection diagram when the battery charger control device is used,

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Battery charger control device 2 Power plug unit 3 Power outlet unit 4 Power line 5 Open / close control unit 6 Liquid level sensor 7 Liquid level detection unit 8 Notification unit C Battery charger Ca Power plug So open signal B Battery Lf Liquid level Ls Reference surface

Continuing on the front page (72) Inventor Mitsuru Nitta 3297-2 Yawata, Kohan, Nagano Pref. Nagano Industry Co., Ltd.

Claims (2)

[Utility model registration claims] A power plug connected to a commercial power supply; a power outlet connected to a power plug of a battery charger; and an open signal or a closed signal connected between the power plug and the power outlet. An open / close control unit that opens and closes a power line between the power plug unit and the power outlet unit according to a signal, a liquid level sensor that detects a liquid level of the battery, and a liquid level sensor that is higher than a reference level set by the liquid level sensor. A control device for a battery charger, comprising: a liquid level detection unit that gives an open signal to the opening / closing control unit when it detects a drop, and opens the power line. 2. The control device for a battery charger according to claim 1, further comprising a notifying unit for notifying that the power supply line has been opened.