JP3039379B2 - Rechargeable battery pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery pack, and more particularly to a non-contact chargeable secondary battery pack that performs charging without connecting to a jack or a terminal.

[0001]

2. Description of the Related Art A conventional charging circuit for a secondary battery pack will be described with reference to the circuit diagram of FIG. In FIG. 5, a rectifying / smoothing / power amplifying circuit 12 performs high-frequency power amplification after an AC input signal is supplied and rectification / smoothing is performed. The primary coil 13 is supplied with power from the rectifier / smoothing / power amplifier circuit 12 to generate an electromagnetic flux. The external power supply unit 11 includes the rectifying / smoothing / power amplifying circuit 12 and the primary coil 13 described above.

The device side circuit has a secondary coil 23, a smoothing / charging control circuit 22 and a device input circuit 31. The secondary coil 23 and the smoothing / charging control circuit 22 control the secondary battery 24 in the secondary battery pack 21. Charge.

When an AC input signal is supplied to the external power supply unit 11, rectification and smoothing are performed by a rectification / smoothing / power amplification circuit 12 to perform high-frequency power amplification, and power is supplied to a primary coil 13. The primary coil 13 receives power supply, generates an electromagnetic flux, and causes the secondary coil 23 to generate an electromotive force by electromagnetic induction. The electromotive force is rectified and smoothed by the smoothing / charging control circuit 22, and further performs charging control suitable for the secondary battery 24 in the independent secondary battery pack 21.

[0004] With the above configuration, the secondary battery 24 is charged. The power supply to the device is performed by the secondary battery 24 via the device input circuit 31.

[0005]

The first problem is that in the conventional charging circuit for a secondary battery pack, it is not possible to later change a pre-designed device that assumes the use of a primary battery to a non-contact charging specification. That was the point.

The reason is that a dedicated circuit must be built in the device, and a large design change is required for an already designed device.

A second problem is that the conventional charging circuit cannot charge the battery pack alone using the same external power supply unit.

The reason is that a circuit required for charging is fixed in the device, and when the battery pack is used alone, the required circuit is not in the battery pack.

An object of the present invention is to provide a secondary battery pack which can easily take in non-contact charging into an apparatus using a primary battery.

[0010]

In the secondary battery pack of the present invention, a secondary battery (6 in FIG. 1) and a secondary coil (5 in FIG. 1) which receives power supply from an external power supply unit are provided. And a charge control circuit (4 in FIG. 1) for determining a power supply specification for charging the secondary battery.

Further , by incorporating a secondary battery, a secondary coil, and a charge control circuit for performing smoothing and charging in a pack occupying the same space as the primary battery, the charging operation itself of the battery is completed in the battery pack. As a result, easily allows the realization of the contactless charging of the secondary battery by the use of the secondary battery pack device designed to correspond to the primary battery.

[0012]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

1 (a) and 1 (b) are structural views showing an embodiment of a secondary battery pack according to the present invention, wherein (a) is a plan view with a case removed, and (b) is a case. It is AA sectional drawing of (a) in the state attached. In the figure, a secondary battery pack 1 includes a substrate 4 on which a smoothing / charging control circuit for performing smoothing and charging control on the secondary side during non-contact charging is mounted, and a secondary coil 5 receiving power supply from the primary side. And a secondary battery 6 for storing electric power, and these are housed in the case 3. A positive terminal 31 is fixed to one end of the case 3, and a negative terminal 32 is fixed to the other end of the case 3. The positive terminal 31 is a positive electrode of the secondary battery 6, and the negative terminal 32 is a secondary battery 6
Are connected respectively to the negative electrodes of.

The secondary battery pack 1 shown in FIGS. 1 (a) and 1 (b)
Can be used instead of the primary battery 10 shown in FIG. In FIG. 2, a primary battery 10 is an alkaline / manganese dry battery, which is housed and connected to a battery housing section of the apparatus housing 2. When the power supply from the primary battery 10 in FIG. 2 is stopped, the primary battery 10 is removed and the secondary battery pack 1 is temporarily stored and used.

FIG. 3 is a circuit diagram showing an example of use of the secondary battery pack of FIG.

In FIG. 3, a rectifying / smoothing / power / amplifying circuit 12 receives an AC input, rectifies and smoothes, and then performs high-frequency power amplification. The primary coil 13 generates a magnetic flux by the AC power generated by the rectification / smoothing / power amplification circuit 12. The external power supply unit 11 includes a rectifying / smoothing / power amplifying circuit 12 and a primary coil 13. Secondary coil 5 receives the magnetic flux generated in primary coil 13. Smoothing / charging control circuit 2
Reference numeral 2 performs charge control for rectifying and smoothing the AC power generated in the secondary coil 5 and generating a charge output suitable for the secondary battery 6. The diode 23 prevents the discharge current of the secondary battery 6 from being input to the smoothing / charging control circuit 22. The secondary battery pack 1 includes a secondary coil 5, a smoothing / charging control circuit 22, a diode 23, and a secondary battery 6, and corresponds to the secondary battery pack 1 in FIG. A device-side input circuit 31 that performs output conversion and the like as device-side input is provided outside the battery pack.

In FIG. 3, the rectification / smoothing / power amplifying circuit 12 which has received the AC input amplifies the power once rectified and smoothed at a high frequency and supplies it to the primary coil 13. The primary coil 13 receives the high-frequency power amplified AC power,
An electromagnetic flux is generated from an alternating current flowing in the coil. The electromagnetic flux passes through the external coil 5 through the external power supply unit 11 and the case 3 of the secondary battery pack 1 to generate an induced electromotive force in the secondary coil 5. The electromotive force is applied to the smoothing / charging control circuit 22.
And supplies a charging output suitable for the secondary battery 6 to the secondary battery 6.

In the embodiment of the present invention, since power is directly supplied from the secondary battery pack 1, the device can be handled with a design specification that only receives power from the output of the secondary battery pack 1. . Thus, the space can be shared with the primary battery 10 such as the dry battery shown in FIG.

FIG . 4 is a circuit diagram showing another usage state of the secondary battery pack of the present invention. In the figure, the external power supply unit is the same as FIG. The difference from FIG. 3 is that the secondary battery pack 1 obtains an output from the smoothing / charge control circuit 22 and is connected to a charging state detection circuit 32 indicating the charging state of the secondary battery 6 to the device side. This charge state detection circuit 32 is shown in FIG.
(A) and (b) may be provided inside the case 100.

The rectifying / smoothing / power amplifying circuit 12 receiving the AC input amplifies the high-frequency power of the power once rectified and smoothed and supplies it to the primary coil 13. The primary coil 13 receives the AC power amplified by the high frequency power and generates an electromagnetic flux from the AC current flowing in the coil. The electromagnetic flux passes through the secondary coil 5 through the external power supply unit 11 and the case of the secondary battery pack 1 to generate an induced electromotive force in the secondary coil 5. The electromotive force is rectified and smoothed by the smoothing / charging control circuit 22 and supplies a charging output suitable for the secondary battery 6 to the secondary battery 6. The smoothing / charging control circuit 22 has a function of outputting to the outside that charging is completed or charging is being performed. The output from the smoothing / charging control circuit is output to a charging state detection circuit 32 provided on the device side. Detected and converted into a signal to the device CPU and output. The device can use the signal from the charge state detection circuit 32 to display the state of charge on the device display unit.

[0021]

The first effect is that non-contact charging by electromagnetic induction can be realized without changing the circuit in an already designed device using a primary battery.

The reason is that a secondary coil and a smoothing / charging control circuit necessary for non-contact charging are incorporated in the secondary battery pack, and they are housed in a case corresponding to the size of the primary battery. is there.

The second effect is that the charging of only the secondary battery pack can be carried out by contactless charging.

The reason is that a circuit necessary for charging is housed in the secondary battery pack.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a secondary battery pack of the present invention,
(A) is a plan view with the case removed, and (b) is an AA cross-sectional view of (a) with the case attached.

FIG. 2 shows a usage state of the primary battery pack in FIG.
It is a top view .

FIG. 3 is a circuit diagram showing a use state of the secondary battery pack of FIG. 1;

FIG. 4 is a circuit diagram showing another usage state of the secondary battery pack of FIG. 1;

FIG. 5 is a circuit diagram of a conventional charging circuit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 secondary battery pack 2 device housing 3 case 4 smoothing / charging control circuit board 5 secondary coil 6 secondary battery 11 external power supply unit 12 rectifying / smoothing / power amplifier circuit 13 primary coil 22 smoothing / charge control circuit 31 device input Circuit 32 Charge state detection circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01M 10/42-10/48 H01M 2/10 H02J 7/00

Claims (3)

(57) [Claims] 1. A secondary battery, a secondary coil receiving power supply from an external power supply unit, and a charge control circuit that rectifies and smoothes an output of the secondary coil and controls charging of the secondary battery. , the secondary battery, the secondary coil and the charging control circuit, have a external terminals, occupy the same space and primary batteries
A secondary battery pack incorporated in a pack having the same . 2. The rechargeable battery pack further includes a charge state detection circuit provided with an external output terminal for indicating a charge state and outputting a result of detection of the charge state in the pack .
The secondary battery pack as described. 3. The secondary battery pack according to claim 1, wherein a diode for blocking a discharge current of the secondary battery is connected between the charge control circuit and the secondary battery.