JPH05137265A - Secondary battery system and charger - Google Patents

Abstract

PURPOSE:To simplify the circuit configuration of a charger by charging batteries in series at the time of discharging of the batteries and by charging the batteries in parallel at the time of charging of the batteries, in a secondary battery system for power supply of a magnetic recording and regenerating device and a charger. CONSTITUTION:To simplify the circuit configuration of a charger by providing switching switches 25 and 26 for switching the combination of batteries in a secondary battery system from series to parallel or vice versa, a switching device 4 for switching a switch, and a switching mechanism for letting the charger operate the switching device 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery device and a charging device having a built-in secondary battery used as a power source of a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art In recent years, in a camera and a video integrated type (hereinafter referred to as a movie), mounting technology of a mechanism, a lens and an electric circuit has been dramatically improved, and reduction in size and weight has been actively promoted.

Along with this, a battery as a power source for movies is also required to have high capacity, small size and light weight.
A battery pack that contains multiple batteries that use high-capacity secondary batteries such as nickel-metal hydride batteries, and has the drawback of not being able to perform series charging because it uses an organic electrolyte, but has a high volume energy density and high weight energy. A lithium secondary battery (hereinafter, referred to as a battery) having a density and a large capacity, a small and lightweight lithium or a lithium alloy as a negative electrode acting substance is used, and is compatible with a battery pack including a plurality of batteries and the battery pack. A charging device (hereinafter referred to as a charger) has been developed and commercialized.

Hereinafter, an example of the above-described conventional secondary battery device and charger will be described with reference to the drawings.

FIG. 4 is a perspective view of a conventional secondary battery device. 41 and 42 are batteries, 43 is an exterior, 44 is a positive electrode terminal connected to the positive electrode of the battery, 45 is a negative electrode terminal, and 46 is a negative electrode terminal 45. And 47 is a common electrode connected to the positive electrode terminal 44, and 47 is a common wire for connecting the batteries 41 and 42.

FIG. 5 is a block diagram of a charger for charging a battery. 501 is an outlet connected to an external AC power source, 502 is a voltage conversion circuit, 503 is a positive electrode rectification circuit,
504 is a negative electrode rectification circuit, 505 is a positive electrode charging circuit, 506
Is a negative charging circuit, 507 is a micro-computer, 50
8 is a power supply circuit for a micro computer, 509 is a level conversion circuit, 510 is a positive terminal, 511 is a common terminal,
Reference numeral 512 represents a negative electrode terminal.

The operation of the secondary battery device and the charger configured as described above will be briefly described with reference to the configuration diagrams of FIGS. 4 and 5.

When the battery is used as a power source, that is, when the battery is discharged, the electrode 44 connected to the positive electrode of the battery and the electrode 45 connected to the negative electrode of the battery of FIG.
1, 42 are used as a series connection.

At the time of charging, the charger of FIG. 5 having a circuit for charging the positive electrode of the battery and a circuit for charging the negative electrode of the battery is used.

The operation during charging will be briefly described with reference to the configuration diagram of the charger shown in FIG. In the charging circuit on the positive electrode side, 501 is connected to an external AC power source, and a voltage conversion circuit 502 converts the voltage into a voltage suitable for charging the battery. The converted AC power is converted into positive DC by the rectifier circuit 503 and supplied to the positive charging circuit 505.

The charging circuit on the negative electrode side is the voltage conversion circuit 5
The AC power source converted in 02 is converted into a negative direct current by the rectifier circuit 504 and supplied to the negative electrode charging circuit 506.

The connection to the battery is made by connecting the electrode 44 connected to the positive electrode of the battery of FIG. 4, the positive electrode terminal 510 connected to the positive electrode of the battery of FIG. 5, and the negative electrode terminal 4 connected to the negative electrode of the battery of FIG.
5 and the negative terminal 512 connected to the negative electrode of the battery of FIG. 5, the common terminal connected to the negative electrodes 41 and 42 of FIG. 4, and the common pin 5 connected to the common terminal of the battery of FIG.
11 are connected and the battery 41 and the battery 42 of FIG. 4 are charged.

Regarding the charging condition for the battery, the micro-computer 507 for controlling the charging state and the level conversion circuit 509 for converting the negative voltage to the positive voltage for operating the micro-computer 507 are charged under the optimum operating condition.

[0014]

However, in the above configuration, in the charging device, each battery is separately charged at the time of charging, so the voltage conversion circuit 502 and the rectification circuit 50 are used.
The charging circuit including 3, 504 has a positive electrode side and a negative electrode side.
A micro-computer 507 that requires a system and that operates on the positive electrode to control the charge state on the negative electrode side
The level conversion circuit 509 is required to match the operating voltages of the above, and the circuit becomes complicated.

The present invention solves the above-mentioned conventional problems, and provides a rechargeable battery device having a simple structure and a charger capable of simplifying a charging circuit.

[0016]

In order to solve the above problems, the present invention provides a secondary battery device having a plurality of rechargeable secondary batteries having a plurality of charging or discharging functions. 2 electrically connected to the positive electrode and the negative electrode of the secondary battery for electrical connection between the secondary battery device and an external device
A secondary battery device having at least one connection terminal and a connection switching means for connecting a plurality of secondary batteries in series or in parallel, and a plurality of secondary battery devices mounted and incorporated in the secondary battery device. A charging device having a function of charging the secondary battery, and a connection for connecting a plurality of secondary batteries connected in series or in parallel when the secondary battery device is mounted. A plurality of two abutting switching means
The charging device includes a switching unit that switches the secondary battery from serial connection to parallel connection.

[0017]

With the above structure, when the secondary battery device is discharged, the secondary batteries in the device are connected in series, and when charging, connection switching means for switching to parallel connection is arranged in the secondary battery device and connected to the charging device. By providing the switching means for operating the switching means, the charging device does not need an individual charging circuit of the battery and a level conversion circuit for controlling charging of the negative electrode, and a plurality of secondary batteries can be operated by one charging circuit. It can be recharged.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the usage state of the charger and the secondary battery device. 1 is a battery pack, 2 is a positive electrode terminal, 3 is a negative electrode terminal, 4 is a switching device, 5 is a charger, 6 is a positive electrode pin, 7 is a negative electrode pin, and 8 is a switching mechanism.

FIG. 2 is a block diagram of a secondary battery device, in which 21 is a battery A, 22 is a battery B, 2 is a positive electrode terminal, 3
Is a negative terminal, 25 and 26 are changeover switches, and 4 is a changeover device for changing over the switches 25 and 26.

FIG. 3 is a block diagram of a charger for charging a battery, 31 is an outlet connected to an external AC power source, 32 is a voltage conversion circuit, 33 is a positive electrode rectifying circuit, 34 is a positive electrode charging circuit, Reference numeral 35 is a micro-computer, 36 is a power supply circuit for the micro-computer, 6 is a positive pin, and 7 is a negative pin.

The operation of the charger and the battery pack configured as described above will be described with reference to FIGS. 1, 2 and 3.

In the state of FIG. 1, the battery pack 1 is not attached to the charger 5, and the contacts of the switch A25 shown in FIG. 2 are connected to c and d. Since the contact point of the switch B26 is connected to e and f, the battery A21 and the battery B22 are connected in series to the positive electrode terminal 2 and the negative electrode terminal 3 in FIG. The state at this time is the discharge use state.

Next, the charging state is such that the battery pack 1 is attached to the charger 5 of FIG. 1, but the switching device 4 of the battery pack 1 and the switching mechanism portion 8 are in contact with each other, and the switching device 4 of the battery pack 1 is the battery. Change the connection status of.

The charging state will be described with reference to FIGS.
When the battery pack 1 is attached to the charger 5, the switching mechanism 8 of FIG. 1 pushes the switching device 4 of FIG. 2 to connect the contact c and the contact b of the switch A25, and the switch B26 similarly contacts e. And g are connected, and by the above operation, the batteries are connected in parallel in the battery pack 1.

The positive terminal 2 of FIG. 2 is connected to the positive pin 6 of FIG. 3, the negative terminal 3 of FIG. 2 is connected to the negative pin 7 of FIG. 3, and the batteries in the battery pack 1 are charged in parallel. ..

As described above, according to the battery pack 1 and the charger 5 of one embodiment of the present invention, it is possible to use the batteries in series connection when discharging the batteries and use the batteries in parallel connection when charging.

The figure shows the configuration of the charger of the present invention. A battery pack device having a device for switching between parallel and series and a mechanism for operating the parallel and series switching device of the battery pack are provided in the battery charger. As a result, the circuit configuration of the charger can be simplified.

[0029]

As described above, the present invention is provided with the secondary battery device having a device for switching the parallel and series of the lithium battery and the charging device having the mechanism for operating the parallel and series of the lithium battery pack. As a result, the circuit configurations of the secondary battery device and the charging device can be simplified, and the secondary battery device and the charging device can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of an embodiment of a charging device and a secondary battery device of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of a secondary battery device of the present invention.

FIG. 3 is a block diagram showing a circuit configuration of an embodiment of a charging device of the present invention.

FIG. 4 is a perspective view showing a conventional secondary battery device.

FIG. 5 is a block diagram showing a circuit configuration of a conventional charging device.

[Explanation of symbols]

 4 Switching device 6 Positive electrode terminal 7 Negative electrode terminal 8 Switching mechanism 31 Outlet 32 Voltage conversion circuit 33 Positive electrode rectifier circuit 34 Positive electrode charging circuit 35 Microcomputer 36 Power supply circuit for microcomputer

Claims (2)

[Claims] 1. A rechargeable battery device having a plurality of rechargeable rechargeable batteries having a function of charging or discharging a plurality of times, wherein the rechargeable battery device is electrically connected to an external device. It is characterized by comprising two or more connection terminals electrically connected to the positive electrode and the negative electrode of the secondary battery, and connection switching means for connecting a plurality of the secondary batteries in series or in parallel. Secondary battery device. 2. A charging device having a function of charging a plurality of secondary batteries incorporated in the secondary battery device by mounting the secondary battery device, wherein the charging device is 2 when the secondary battery device is mounted. The secondary battery device is equipped with a switching device that is incorporated in the secondary battery device and is in contact with a connection switching device for connecting the plurality of secondary batteries in series or in parallel, and that switches the plurality of secondary batteries from serial connection to parallel connection. A charging device characterized in that.