JPH0715317Y2 - Automatic voltage switching battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Purpose of the Invention (Field of Industrial Application) The present invention relates to a voltage automatic switching battery.

(Prior Art) Conventionally, a battery mounted on a battery vehicle has, for example, a voltage
A low voltage type that uses one 36V battery is common. Then, two positive and negative terminals of this battery are connected to a plug, and a plug having a load or a two terminal of a charger is connected to the plug for discharging or charging.

In addition, in recent years, increasing the battery voltage from 36V to 72V can reduce the current value, and as a result, there are advantages such as thin wires for electrical wiring and miniaturization of electronic elements. Voltage conversion is required.

(Problems to be solved by the invention) However, if the battery voltage is simply changed,
The charger must also be changed to a high voltage one. Also, 72
There is also a problem that the V battery cannot be directly applied to a low voltage type vehicle equipped with a conventional 36V battery.

The present invention has been made to solve the above problems, and its purpose is to be compatible with loads such as vehicles having different voltages and chargers, and particularly to loads such as low voltage type vehicles. The purpose of the present invention is to provide a highly practical battery that can be applied with the conventional structure without changing the plug or the like of the battery charger or the charger.

Configuration of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention connects a plurality of battery units to a three-terminal plug through a control unit, and Of these, two terminals are positive and negative terminals, and the remaining one is an auxiliary terminal,
A parallel circuit for connecting the battery units to the positive electrode terminal and the load terminal in parallel, the normally-closed contacts interposed in the parallel circuit, and the battery units when the normally-closed contacts are opened. Composed of a series circuit for connecting in series to the positive electrode terminal and the load terminal, a normally open contact interposed in the series circuit, and a relay coil excited to simultaneously open and close the normally closed contact and the normally open contact. However, one end of the relay coil is connected to one of the positive terminal and the load terminal, and the other end of the relay coil is connected to the auxiliary terminal.

(Effect) By adopting the above means, the present invention makes it possible to prevent the relay coil from being excited by connecting the positive and negative two-terminal plugs to the conventional low-voltage type vehicle load and charger. The units remain connected in parallel. Therefore, the low voltage type can be applied with the conventional positive / negative two-terminal plug, so that there is no need to change the design of the load and charger of the conventional low voltage type vehicle, etc. Can be used.

On the other hand, for a high-voltage type vehicle load or charger, if a type with auxiliary terminals for the relay coil added to the positive and negative two-terminal plug is used, the relay coil is excited and each battery The units are directly connected and high voltage can be obtained.

(Embodiment) An embodiment embodying the present invention will be described in detail below with reference to FIGS.

FIG. 1 shows the entire circuit of a voltage switching battery according to the present invention, a battery section 1 consisting of two battery units 2 and 3, a relay coil 4 and a normally closed and normally open contacts a, b and c.
It is composed of a control unit 5 having a and a plug 6. In this embodiment, each battery unit 2,3
The output voltage of is 36V.

The battery unit 1 is composed of two battery units 2 and 3, and the positive electrode terminal P1 of the first battery unit 2 is connected to the positive electrode terminal P2 of the plug 6. Further, the positive electrode terminal P1 of the first battery unit 2 is connected to the normally closed contact point a of the controller 5, and the normally closed contact point a is respectively connected to the normally open contact point b and the positive electrode terminal P1 ′ of the second battery unit 3. It is connected. Further, the positive terminal P1 of the first battery unit 2 is connected to the auxiliary terminal A of the plug 6 via the relay coil 4.

On the other hand, the negative electrode terminal M1 of the first battery unit 2 is connected to the normally open contact b, and the normally open contact b is connected to the second battery unit 3
Is connected to the positive electrode terminal P1 '. The negative terminal M1 of the first battery unit 2 is connected to the normally closed contact c, and the normally closed contact c is connected to the negative terminal M1 'of the second battery unit 3 and the negative terminal M2 of the plug 6, respectively. There is. The negative terminal M1 ′ of the second battery unit 3 is connected to the negative terminal M2 of the plug 6.

Reference numeral 7 indicates a machine body plug driven by a voltage of 72V, and includes a positive electrode terminal P3, a negative electrode terminal M3, and a negative electrode terminal M3.
The auxiliary terminals B are connected to each other, and when they are connected to the plug 6 of the battery, the terminals having the same polarity are matched with each other. 2 shows a plug 8 of the charger shown in FIG. 2, which is composed of a positive electrode terminal P4 and a negative electrode terminal M4, and when connected to the battery plug 6, the terminals having the same polarity are aligned with each other. ing.

Now, the operation of the automatic voltage switching battery configured as described above will be described below.

In FIG. 1, the positive electrode terminal P1 of the first battery unit 2
Is connected to the positive terminal P1 'of the second battery unit 3 via the normally closed contact a, and the negative terminal of the first battery unit 2 is
M1 is connected to the negative terminal M'of the second battery unit via the normally closed contact c. Therefore, both battery units
2, 3 are connected in parallel, and a voltage of 36 V is applied between the positive and negative terminals P2, M2 of the plug 6.

Now, when the machine body plug 7 is connected to the battery plug 6, the current flowing from the positive electrode terminal P1 of the first battery unit 2 is relay coil 4, the auxiliary terminals A and B of both plugs 6 and 7, and the negative electrodes M2 and M3. To reach the negative electrode terminal M1 'of the second battery unit 3. Therefore, the relay coil 4 is excited,
The normally closed contacts a and c are opened and the normally open contact b is closed. Therefore, the power supply between the positive electrode terminals P1 and P1 'of both battery units 2 and 3 and these negative electrode terminals M1 and M1' is cut off, and the negative electrode terminal M1 of the first battery unit 2 and the positive electrode of the second battery unit 3 are positively connected. The terminal P1 'is connected via a normally open contact b. Therefore, both battery units
2,3 are connected in series, and the positive and negative terminals P3,
A voltage of 72V is applied between M3.

When charging the above-mentioned battery, the plug 8 shown in FIG. 2 is connected to the battery plug 6. As described above, the plug 8 has the positive and negative terminals P4 and M4, but does not have the auxiliary terminal. Therefore, the first
The current flowing from the battery unit 2 does not reach the relay coil 4, the normally closed contacts a and c are in the closed state, and the normally open contact b.
Is opened, and both battery units 2 and 3 are connected in parallel. Therefore, the battery can be charged at a voltage of 36V.

As described above, since this battery can be discharged at a high voltage, the current value can be reduced. Therefore, the wires in the electric wiring of the machine base can be thinned and the electronic element can be miniaturized.

Also, if the machine drive voltage is 36 V, machine stand plug 7
If the auxiliary terminal B is omitted, both battery units 2 and 3 are connected in parallel. Therefore, a voltage of 36 V is applied between the positive and negative terminals P3 and M3 of the machine body plug 7.

As described above, this battery is compatible with loads and chargers having different voltages.

Effects of the Invention As described in detail above, the present invention is compatible with loads and chargers of vehicles having different voltages, and particularly plugs and the like for loads and chargers of low voltage type vehicles and the like. This is a highly practical device that has the effect that it can be applied with the existing structure without modification.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram embodying the present invention, FIG. 2 is an electric circuit diagram of a charger, and FIG. 3 is an electric circuit diagram showing a conventional example. Battery units 2, 3, control unit 5, battery plug 6,
Load side plug 7, positive terminals P2, P3, negative terminals M2, M3, auxiliary terminals A, B.

Claims (1)

[Scope of utility model registration request] 1. A plurality of battery units are connected to a three-terminal plug through a control unit, two terminals of the three-terminal plug are used as a positive electrode terminal and a negative electrode terminal, and the remaining one terminal is assisted. A parallel circuit for connecting the battery units to the positive electrode terminal and the negative electrode terminal in parallel, the normally closed contact interposed in the parallel circuit, and the normally closed contact when the normally closed contact is opened. A series circuit that connects each battery unit to the positive electrode terminal and the negative electrode terminal in series, a normally open contact interposed in the series circuit, and a relay coil that is excited to simultaneously open and close the normally closed contact and the normally open contact. And a voltage automatic switching battery in which one end of a relay coil is connected to one of a positive electrode terminal and a negative electrode terminal and the other end of the relay coil is connected to an auxiliary terminal.