JPH07240238A - Storage battery, discharger and charger - Google Patents

Abstract

PURPOSE:To realize improvement in the number of charging and discharging cycle times by performing discharging and charging for each cell in a storage battery with a plurality of cells placed in series connection, conerning charging and discharging of the storage battery. CONSTITUTION:A discharger 18 comprises a plurality of discharging terminals 13 to which a storage battery 12 is attached and having a plurality of storage battery cells 11 with each of which has a positive/negative terminal 10, a voltmeter 14, a load resistor 15, switches 16 and a discharging control unit 17 and the discharging terminals 13 draw out the positive/negative terminals 10 of all the storage battery cells 11. Each changeover switch 16 selects the discharging terminals connected to the positive/negative terminals 10 of the target storage battery cells 11 one by one by means of control of the discharging control unit 17, discharging is performed for each cell by a load resistor 15, and when all storage battery cells are discharged 11, and the storage battery 12 and the discharger 18 and electrically separated by the switch 16 and discharging is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to charging / discharging of a storage battery,
The present invention relates to discharging and charging in a storage battery in which a plurality of cells are connected in series, in which charging and discharging are performed for each of the cells to increase the number of charge and discharge cycles.

[0002]

2. Description of the Related Art In recent years, storage batteries have been widely used as power sources for various portable electronic devices such as video movies and notebook personal computers. Each dedicated storage battery is used to miniaturize the electronic device. In order to obtain the desired voltage, the required number of cells are connected in series inside the storage battery, and two positive and negative terminals are connected to the outside. There is. In addition, some storage batteries, such as nickel-cadmium batteries, have a memory effect of reducing the charge capacity when the discharge is stopped during the discharge and charging is performed. In order to prevent or recover from this, a method has been performed in which the battery is fully discharged and then charged.
Therefore, not only the charger but also the discharger has become an important device for using the storage battery.

A conventional discharging device and charging device will be described below with reference to the drawings. First, a conventional discharge device is shown in FIG. In FIG. 3, the discharge device includes a discharge terminal 33 to which a storage battery 32 having a plurality of storage battery cells 31 connected in series having two positive and negative terminals 30 is attached, and a voltmeter 34 for measuring an output voltage of the storage battery 32. , A load resistor 35, a switch 36, and a discharge controller 37,
The voltmeter 34, the load resistance 35, the switch 36, and the discharge controller 37 constitute a discharger 38.

In the discharging operation, the storage battery 32 is discharged by the load resistance 35 which is the discharge resistance of the discharger 38, the output voltage of the storage battery 32 is measured by the voltmeter 34, and the switch 36 is turned off when the output voltage falls below a certain voltage. The discharge controller 37
Was controlled to discharge.

Next, a conventional charging device is shown in FIG. In FIG. 4, the charging device includes a charging terminal 43 to which a storage battery 42 having a plurality of storage battery cells 41 connected in series having two positive and negative terminals 40 is attached, and a voltmeter 44 for measuring the output voltage of the storage battery 42. , Current source 45 and switch 46
And a charging control unit 47. The voltmeter 44, the current source 45, the switch 46, and the charging control unit 47 make up a charger 48.
Was configured.

In the charging operation, the storage battery 42 is charged by the current source 45 of the charger 48 and the storage battery 4 is charged by the voltmeter 44.
The voltage applied to No. 2 is measured, and the charging control unit 47 controls the charging so that the switch 46 is turned off when the voltage exceeds a certain voltage.

[0007]

However, in the above-mentioned conventional method, as shown in FIG.
The capacities of 0.51 actually vary even if the same nominal value is used. Therefore, the storage battery cell 50 having a small capacity at the time of discharging has a normal capacity at the initial stage of discharging shown in FIG. 5A, but the storage battery cell 50 having a small capacity at the latter stage of discharging shown in FIG. Large storage battery cell 51
Due to this, reverse charging occurs and the characteristics deteriorate. As a result, there is a problem that the number of charge / discharge cycles of the storage battery is reduced. Reference numeral 52 in FIG. 5 is a load resistance.

An object of the present invention is to provide a storage battery, a discharging device and a charging device in which a storage battery cell having a small capacity is not reversely charged.

[0009]

In order to solve the above-mentioned conventional problems, the storage battery of the present invention is a storage battery having a plurality of storage battery cells, each storage battery cell being connected to a discharging device or a charging device. It has a positive / negative terminal connected to a plurality of charge / discharge terminals and drawn out.

Further, the discharge device comprises a plurality of discharge terminals to which storage batteries having a plurality of storage battery cells each having positive and negative terminals are attached, and a discharger, and the discharger measures and monitors the output voltage of the storage battery. Voltmeter, a load resistance for discharging the capacity of the storage battery, a switch for selecting and connecting one discharge terminal connected to the positive and negative terminals of the storage battery cell, and the switch based on the measurement value of the voltmeter And a discharge control unit that controls load resistance and connection switching with the discharge terminal, and the discharge terminal is connected to all positive and negative terminals of the storage battery cell.

The charging device comprises a plurality of charging terminals to which storage batteries having a plurality of storage battery cells each having a positive and negative terminal are attached, and a charger, and the charger measures and monitors the voltage applied to the storage batteries. Voltmeter, a current source for applying a current to be applied to the storage battery, a switch for selecting and connecting one by one the charging terminals connected to the positive and negative terminals of the storage battery cell, and the switch based on the measured value of the voltmeter And a charging control unit for controlling connection switching with the charging terminal and a current source, and the charging terminal is connected to all positive and negative terminals of the storage battery cell.

[0012]

With the above structure, in a storage battery in which a plurality of cells are connected in series, charge and discharge can be performed for each of the cells regardless of any capacity variation among the storage batteries. By performing charging, it becomes possible to charge and discharge each cell without reverse charging, and the number of charge and discharge cycles of the storage battery is improved.

[0013]

EXAMPLES An example of the present invention will be described below.

FIGS. 1 and 2 show a storage battery, a discharging device and a charging device according to an embodiment of the present invention.
Instead of discharging or charging the storage batteries connected in series at the same time, a means for discharging or charging one by one is used.

First, the storage battery according to this embodiment will be described with reference to FIG. The storage battery of this embodiment is a storage battery 12 having a plurality of storage battery cells 11 each having a positive / negative terminal 10. With this configuration, through each positive and negative terminal,
It is possible to individually charge and discharge each charge cell 11.

Next, referring to FIG. 1, a storage battery and a discharging device according to this embodiment will be described. The storage battery and the discharge device of the present embodiment include a plurality of discharge terminals 13 to which a storage battery 12 having a plurality of storage battery cells 11 each having a positive / negative terminal 10 is attached, and a voltmeter 14 for measuring an output voltage of the storage battery 12. , A load resistor 15, a switch 16 and a discharge control unit 17, the voltmeter 14 and the load resistor 15
The switch 16 and the discharge control unit 17 constitute a discharger 18. The discharge terminal 13 is used for all the storage battery cells 11
The positive and negative terminals 10 are drawn out.

The discharge operation is controlled by the discharge controller 17 so that the switch 16 for switching is connected to the positive / negative terminal 10 of the target storage battery cell 11 and the discharge terminal 1
3 is selected one by one, each cell is discharged by the load resistance 15, and the output voltage of the storage battery cell 11 is monitored by the voltmeter 14,
When the voltage becomes equal to or lower than a certain voltage and all the storage battery cells 11 are discharged, the switch 16 for switching electrically disconnects the storage battery 12 and the discharger 18 and ends the discharge.

Next, the storage battery and the charging device according to this embodiment will be described with reference to FIG. The storage battery and the charging device of the present embodiment each have a positive / negative terminal 20, a plurality of charging terminals 23 to which a storage battery 22 having a plurality of storage battery cells 21 is attached, and a voltmeter for measuring the voltage applied to the storage battery 22. 24, a current source 25 for applying a current to the storage battery cells of the storage battery 22, a switch 26, and a charge control unit 27.
And a voltmeter 24, a current source 25 and a switch 2
6 and the charging control unit 27 constitute a charger 28. The charging terminal 23 is the positive / negative terminal 2 of all the storage battery cells 21.
0 is pulled out.

The discharging operation is controlled by the charging control unit 27 so that the switch 26 for switching is connected to the positive / negative terminal 20 of the target storage battery cell 21 and the charging terminal 2
3 is selected one by one, each cell is charged by the current source 25, the applied voltage to the storage battery cell 21 is measured by the voltmeter 24,
When the voltage is monitored and becomes a certain voltage or more, the switch 26 for switching is switched to the next storage battery cell 21. When all the storage battery cells 21 are charged, the switch 26 for switching
To electrically disconnect the storage battery 22 and the charger 28 from each other,
That is to end charging.

Needless to say, in the discharging device and the charging device of this embodiment, the number of positive / negative terminals and the number of charging / discharging terminals are increased / decreased as the number of storage battery cells is increased / decreased.

[0021]

The discharge device and the charging device of the present invention discharge and charge the cells in the storage battery one by one, so that the cells are charged and discharged without being reversely charged. This makes it possible to improve the number of charge / discharge cycles.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a storage battery and a discharge device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a storage battery and a charging device according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional storage battery and a discharging device.

FIG. 4 is a configuration diagram showing a conventional storage battery and a charging device.

FIG. 5 is a diagram showing a change in capacity of a conventional storage battery cell.

[Explanation of symbols]

 10, 20 Positive / negative terminals 11, 21, 31, 41, 50, 51 Storage battery cells 12, 22, 32, 42 Storage battery 13, 33 Discharge terminals 14, 24, 34, 44 Voltmeter 15, 35, 52 Load resistance 16, 26 , 36, 46 Switch 17, 37 Discharge control unit 18, 38 Discharger 23, 43 Charging terminal 25, 45 Current source 27, 47 Charge control unit 28, 48 Charger 30, 40 Positive and negative 2 terminals

Claims (3)

[Claims] 1. A storage battery comprising a plurality of storage battery cells, each storage battery cell having a positive / negative terminal connected to a plurality of charging / discharging terminals connected to a discharging device or a charging device, and drawn out. . 2. A voltmeter for measuring and monitoring the output voltage of the storage battery, which comprises a plurality of discharge terminals to which storage batteries having a plurality of storage battery cells each having positive and negative terminals are attached, and a discharger. A load resistance that discharges the capacity of the storage battery, a switch that selects and connects one discharge terminal connected to the positive and negative terminals of the storage battery cell, and the discharge of the switch based on the measurement value of the voltmeter. A discharge device comprising: a discharge control unit that controls connection switching with a terminal and load resistance, and the discharge terminal is connected to all positive and negative terminals of the storage battery cell. 3. A plurality of charging terminals to which a storage battery having a plurality of storage battery cells each having a positive and negative terminal is attached, and a charger, wherein the charger measures and monitors a voltage applied to the storage battery. Meter, a current source for applying a current to be applied to the storage battery, a switch for selecting and connecting one charging terminal connected to each of the positive and negative terminals of the storage battery cell, and the switch of the switch based on the measurement value of the voltmeter. A charging device comprising: a charging control unit for controlling connection switching with a charging terminal and a current source, wherein the charging terminal is connected to all positive and negative terminals of the storage battery cell.