JP3292431B2 - Method for preventing overdischarge of secondary battery and battery pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing overdischarge of a secondary battery and a battery pack capable of preventing overdischarge of the secondary battery.

[0002]

2. Description of the Related Art In recent years, portable electronic devices have rapidly spread, and rechargeable secondary batteries have been used in various portable electronic devices.

A nickel cadmium battery is currently used as a secondary battery in the mainstream, but a lithium ion secondary battery has attracted attention because of its high energy density.

However, some of these high-performance secondary batteries have their characteristics deteriorated when they are overcharged or overdischarged. Therefore, the secondary batteries are overcharged or overcharged by using a control circuit together. The battery is not discharged.

FIG. 2 is a configuration diagram showing an example of a battery pack using a secondary battery which also uses a control circuit as described above. In the figure, 1 is a secondary battery, 2 is a voltage detection control circuit, 3 is a power control circuit, 4a and 4b are output terminals, and a charge / discharge control circuit 5 is constituted by the voltage detection control circuit 2 and the power control circuit 3. ing.

The positive terminal of the secondary battery 1 is connected to the voltage detection control circuit 2 and the output terminal 4a, and the negative terminal is connected to the voltage detection control circuit 2 and to the output terminal 4b via the power control circuit 3. ing. The power control circuit 3 controls a current between the secondary battery 1 and the output terminal 4b based on a control signal from the voltage detection control circuit 2.

According to the above configuration, the voltage between the terminals of the secondary battery 1 is detected by the voltage detection control circuit 2, and the detected voltage becomes equal to or higher than a predetermined upper limit value or lower than a lower limit value. Alternatively, when the battery is about to be over-discharged, a control signal is output from the voltage detection control circuit 2 and the power control circuit 3 cuts off the flow of current between the secondary battery 1 and the output terminal 4b. . This prevents the secondary battery 1 from being overcharged or overdischarged,
The characteristics of the secondary battery 1 are prevented from deteriorating.

[0008]

However, in the above-described conventional battery pack, since current always flows from the secondary battery 1 to the voltage detection control circuit 2, power is consumed even when the battery pack is not used. In some cases, the battery may have reached a discharge state, causing deterioration of characteristics of the secondary battery.

In view of the above problems, an object of the present invention is to provide a method for preventing overdischarge of a secondary battery by eliminating power consumption when not in use, and a battery pack using the same.

[0010]

According to the present invention, in order to achieve the above-mentioned object, the present invention has an operation start switch,
In addition, for a higher-level device to be supplied with power, the higher-level device
A case that is configured to be detachable from the
Voltage between the secondary battery and the terminal voltage of the secondary battery
Detected by the control circuit, and based on the detection result, the secondary
A charge / discharge detection circuit that controls the current from the battery to the load;
Connected between the voltage detection control circuit and the secondary battery,
A battery provided with a switch interlocked with the operation start switch.
This is a method for preventing overdischarge of secondary batteries in a terry pack.
When the battery pack is attached to the host device,
When the operation start switch is turned on
Only, a method for preventing overdischarge of a secondary battery in which a switch of the battery pack is turned on is proposed.

According to a second aspect of the present invention, a magnet is provided at the end,
The battery pack of the host device is moved so that the magnet slides.
The slide switch located adjacent to the
Used as an operation start switch and the battery
-Use a reed switch as a switch of the pack,
A battery pack is attached to the host device,
Only when the start switch is on, the magnet is
Magnetic force generated by the magnet when approaching the mode switch
Accordingly, a method for preventing overdischarge of a secondary battery that turns on the reed switch is proposed.

According to a third aspect of the present invention, the operation start switch is provided.
One end of the operation start switch when the switch is turned on.
Part is an opening provided in a predetermined position of the battery pack mounting part
Slide switch arranged to protrude through the part
Is used as the operation start switch, and
When mounted on the position device, it faces the opening of the upper device.
Battery pack switch with an opening at
Using a microswitch, and the battery pack
The operation start switch is attached to the host
Is turned on, and is turned on.
The operation start switch to the opening of the battery pack
When one end is inserted, the one end is
A method for preventing overdischarge of a secondary battery that turns on a switch is proposed.

According to the present invention, the electric power is supplied.
It has a case that is configured to be detachable from the host
The voltage between the terminals of the secondary battery is detected in the
A voltage detection control circuit that outputs a control signal based on
The control signal connected between a secondary battery and a power supply terminal
Based on the voltage between the secondary battery and the power supply terminal.
A power control circuit for controlling the flow of electricity,
A charge / discharge control circuit for controlling discharge and overcharge.
In the battery pack, the operation provided in the host
Switch that works in conjunction with the operation start switch
A battery connected between the battery and the voltage detection control circuit.
Suggest a battery pack.

According to a fifth aspect of the present invention, there is provided the battery according to the fourth aspect.
-Pack, a reed switch as the switch
That faces the battery pack mounting surface of the host device.
The reed switch is arranged adjacent to the surface to be
Suggest a battery pack.

According to a sixth aspect of the present invention, there is provided the battery according to the fourth aspect.
In the pack, a microswitch is used as the switch.
To the battery pack mounting surface of the host device.
An opening provided at a predetermined position on the facing surface;
Having a micro switch disposed inside
Suggest a pack.

[0016]

According to the first aspect of the present invention, the overdischarge of the secondary battery is prevented.
In the method, the battery pack is attached to the host device.
State, the operation start switch is turned on.
Only when the battery pack is turned on.
State, the secondary battery and the voltage detection circuit are energized,
The voltage between terminals of the secondary battery is controlled by the voltage detection control circuit.
Detected. At the same time, the detection result is a predetermined upper limit value.
Above or below the lower limit, the secondary battery is overcharged
Or, when it is about to reach an overdischarge state,
The current from the secondary battery to the host device is controlled. Conversely,
When the operation start switch is off, the battery pack
The battery switch is also off, and the secondary battery and the voltage
The outgoing circuit remains shut off. Note that the battery pack
When the host is not attached to the host device, the secondary
The battery and the voltage detection control circuit are not energized.
As described above, the battery pack
Not only in the non-mounted state, but also in the mounted state
Also controlling the on / off state of the operation start switch
This prevents unnecessary current from flowing through the voltage detection control circuit.
Can be passed.

Further , the secondary battery according to claim 2 is prevented from being over-discharged.
In the stopping method, the battery pack is connected to the host device.
And the operation start switch is turned on.
Only when the magnet approaches the reed switch
The magnetic force generated by the magnet
When the switch is turned on, the secondary battery and the voltage detection
The control circuit is energized, and the voltage between the terminals of the secondary battery is
It is detected by the detection control circuit. At the same time,
Result is not less than a predetermined upper limit value or less than a lower limit value, the secondary
The battery is about to overcharge or overdischarge
The current from the secondary battery to the host device is controlled.
It is. Conversely, when the operation start switch is in the off state
Means that the magnetic force from the magnet does not reach the reed switch.
The reed switch remains off and the
The secondary battery and the voltage detection control circuit remain disconnected.
Therefore, no current flows to the host device. The battery
When the pack is not attached to the host device,
The energization of the secondary battery and the voltage detection control circuit is interrupted.
You. As described above, the battery pack is
Not only when the camera is not mounted, but also when
Controlling the on-off state of the operation start switch can have
As a result, unnecessary current flows through the voltage detection control circuit.
Can be prevented.

Further, the secondary battery according to claim 3 is prevented from being over-discharged.
In the stopping method, the battery pack is connected to the host device.
When the operation start switch is on.
Only when one end of the operation start switch is connected to the microphone
Switch, the secondary battery and the voltage detector
Output control circuit is energized, and the voltage between the terminals of the secondary battery is
It is detected by the voltage detection control circuit. At the same time, the inspection
The output result is equal to or higher than a predetermined upper limit or lower than a lower limit, and
The rechargeable battery is almost overcharged or overdischarged
The current from the secondary battery to the host
Is controlled. Conversely, when the operation start switch is in the off state,
When the operation start switch is the micro switch
Is not turned on, the secondary battery and the voltage detection control
The circuit remains disconnected. The battery pack
Is not attached to the host device, the secondary
The energization of the battery and the voltage detection control circuit is cut off. Less than
As above, the battery pack is
Not only when not wearing, but also when wearing
Controlling the on / off state of the operation start switch;
This prevents unnecessary current from flowing through the voltage detection control circuit.
Can be passed.

Further, in the battery pack according to the fourth aspect,
According to the voltage detection control circuit, the voltage between the terminals of the secondary battery
Is detected, and a control signal based on the inter-terminal voltage is output.
You. Based on the control signal, the power control circuit
Current control between the secondary battery and the power supply terminal is performed.
In particular, it is linked to the operation start switch provided in the host device.
The switch that operates by operating the battery is connected to the secondary battery and the voltage detector.
The connection between the output control circuit and the
Even when attached to a higher-level device,
If the obtained operation start switch is not turned on,
Since the switch of the battery pack does not turn on,
The secondary battery and the voltage detection control circuit are not energized. Reverse
Only when the operation start switch is turned on,
Since the battery pack switch is turned on,
The secondary battery and the voltage detection control circuit are energized, and the secondary battery
Is detected by the voltage detection control circuit.
You . At the same time, the detection result is above or below a predetermined upper limit.
Limit value, the secondary battery is overcharged or overcharged.
When the battery is about to be discharged, the secondary battery
The current to the host device is controlled. In addition, the upper device
On the other hand, when it is not attached, the switch is turned off.
Therefore, there is no communication between the secondary battery and the voltage detection control circuit.
There is no electricity. As described above, the battery pack
Not only when the device is not mounted, but also when
In this state, the on / off state of the operation start switch is controlled.
Control, an unnecessary current flows through the voltage detection control circuit.
Can be prevented.

[0020] In the battery pack according to the fifth aspect,
According to the battery pack according to claim 4,
A reed switch as the switch;
When mounted on the battery pack of the host device
The reed switch is arranged adjacent to the surface facing the mounting surface.
So that, for example, at the end as the operation switch
A slide switch having a magnet can be used.
In this case, next to the battery pack mounting part of the host device
The magnet can slide in contact with the battery.
When the upper device of the Reapack is attached to the slide switch,
Switch on the bottom of the reed switch.
The reed by the magnetic force generated from the magnet to be placed
When the switch is turned on, the secondary battery and the voltage detection
The control circuit is energized, and the voltage between the terminals of the secondary battery is
It is detected by the detection control circuit. At the same time, the detection
The result is not less than the predetermined upper limit or not more than the lower limit, and
The secondary battery is likely to reach an overcharged or overdischarged state.
The current from the secondary battery to the host device is
Is done. Conversely, when the operation start switch is in the off state,
When the magnetic force from the magnet reaches the reed switch,
The reed switch remains off because there is no
The secondary battery and the voltage detection control device remain disconnected.
You. The battery pack is not attached to the host device.
Sometimes, the reed switch stays off
Then, the energization of the secondary battery and the voltage detection control circuit is cut off.
Have been. As described above, the battery pack
Not only when the device is not
State, the operation start switch is turned on and off.
By controlling, unnecessary current is supplied to the voltage detection control circuit.
It can be prevented from flowing.

Further , according to the battery pack of the sixth aspect,
For example, in the battery pack according to claim 4, the switch
Equipped with a micro switch as a switch
When the battery pack mounting surface of the host device is
An opening provided at a predetermined position on the facing surface; and the opening
Has a microswitch arranged inside. here
Is, for example, a slide switch as the operation start switch.
Switches can be used. Turn on the operation switch
When one end of the operation start switch is
-Projects through the opening provided at the specified position of the pack mounting part
So that the operation start switch is set in the host device.
Place. Slide the operation start switch to the ON state
The battery pack from the opening of the host device.
One end of the operation start switch is inserted into the opening of
When the one end turns on the micro switch
Such an arrangement can be taken. Therefore, with the secondary battery
The voltage detection control circuit can be energized;
The terminal voltage of the secondary battery is detected by the detection control circuit.
Is done. At the same time, if the detection result is equal to or more than a predetermined upper limit,
Is less than or equal to the lower limit, and the secondary battery is in an overcharged state.
Indicates that the secondary battery is
The current from the controller to the host device is controlled. In addition, the sly
When the switch is off, one end of the operation start switch
Does not turn on the microswitch, so the
No current flows between the secondary battery and the voltage detection control circuit.
Note that the battery pack is not attached to the host device.
State, the micro switch remains off
Therefore, between the secondary battery and the voltage detection control circuit
There is no electricity. As described above, the battery pack
Not only when the device is not
The on / off state of the operation start switch even in the wearing state
Is controlled, the unnecessary current is supplied to the voltage detection control circuit.
Can be prevented from flowing.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a block diagram showing a battery pack using a secondary battery in combination with charge-discharge control circuit of Example 1 of the present invention. In the figure, the same components as those of the above-described conventional example are denoted by the same reference numerals. That is, 1 is a secondary battery, 2 is a voltage detection control circuit, 3 is a power control circuit, 4a and 4b are output terminals, 6 is a reed switch, and the voltage detection control circuit 2
The power control circuit 3 and the reed switch 6 constitute a charge / discharge control circuit 7.

The positive terminal of the secondary battery 1 is connected to the output terminal 4a and to the voltage detection control circuit 2 via the reed switch 6, and the negative terminal is connected to the voltage detection control circuit 2 and the power control circuit. 3 is connected to an output terminal 4b. The power control circuit 3 controls the current between the secondary battery 1 and the output terminal 4b based on the control signal from the voltage detection control circuit 2, and the power supply from the secondary battery 1 to the voltage detection control circuit 2 When there is no output, the voltage detection control circuit 2 outputs the secondary battery 1 and the output terminal 4b in the power control circuit 3.
Is electrically disconnected.

Each of the components described above is housed in a case 8 to form a battery pack 10 as shown in FIG. 3, and output terminals 4a and 4b are provided on one side of the case 8. Further, the reed switch 6 is arranged at a position facing the mounting surface of the charger or the upper device 20 suitable for the battery pack 10, and the upper device 20 has a magnet at a position facing the reed switch 6 when the battery pack is mounted. 21 are provided.

According to the above configuration, the battery pack 1
When 0 is attached to the host device 20, the magnet 21 faces the reed switch 6 as shown in FIG. 4, and the reed switch 6 is turned on by the magnetic force generated from the magnet 21.
As a result, the secondary battery 1 is connected to the voltage detection control circuit 2 via the reed switch 6, and the voltage between the terminals of the secondary battery 1 is detected by the voltage detection control circuit 2. When this detection voltage becomes equal to or more than a predetermined upper limit value or equal to or less than a lower limit value and the secondary battery is about to reach an overcharged state or an overdischarged state, a control signal is output from the voltage detection control circuit 2 and power control is performed. The circuit 3 blocks the flow of current between the secondary battery 1 and the output terminal 4b. Thereby, the secondary battery 1 does not enter an overcharged state or an overdischarged state, and the characteristic deterioration of the secondary battery 1 is prevented.

When the battery pack 10 is detached from the host device 20 when not in use, the magnetic force from the magnet 21 does not affect the reed switch 6, and the reed switch 6 is turned off. This allows
The power supply from the secondary battery 1 to the voltage detection control circuit 2 is cut off, the wasteful power consumption by the voltage detection control circuit 2 is suppressed, and the discharge current of the secondary battery 1 when not in use is reduced by the self-discharge inside the battery element. And the time required to reach the overdischarge state becomes longer than before.

Further, since the reed switch 6 is turned on and off by the magnet 21, it can be used only by the host device 20 suitable for the battery pack 10, so that accidents due to misuse can be prevented and safety can be prevented. Performance can be improved.

Next, a first embodiment of the present invention will be described.
FIG. 5 is a configuration diagram showing the first embodiment . Configuration of the battery pack 10 in this embodiment is the same as in Reference Example 1 described above, the difference from the reference example 1 and the first embodiment lies in that the movable magnet 21 provided to the host device 20 .

That is, in the figure, reference numeral 22 denotes an operation start switch (power switch) of the host device, which is composed of, for example, a sliding slide switch. A magnet 21 is attached to one end of the operation start switch 22. When the switch 22 is turned on, the magnet 21 moves with the sliding of the switch 22 and faces the reed switch 6. .

According to the above configuration, the battery pack 1
Only when 0 is attached to the host device 20 and the operation start switch 22 is turned on, power is supplied from the secondary battery 1 of the battery pack 10 to the host device, and the secondary battery 1 is connected to the host device via the reed switch 6. The voltage detection control circuit 2 is energized to perform charge / discharge control.

Therefore, even when the battery pack 10 is mounted on the host device 20, the operation start switch 22
Is off, the power supply from the secondary battery 1 to the host device 20 is cut off, and the reed switch 6 is turned off, so that the power supply from the secondary battery 1 to the voltage detection control circuit 2 is also cut off. Unnecessary power consumption by the voltage detection control circuit 2 is suppressed, and the discharge current of the secondary battery 1 when not in use is only self-discharge inside the battery element, and the time to reach the overdischarge state is longer than before. Become.

In the first embodiment , the operation start switch 22 of the host device 20 is a slide switch and the magnet 21 moves together with the slide switch. However, the present invention is not limited to this. The same effect can be obtained by using a push button type, a seesaw type, a rotary type, or the like by configuring the magnet 21 to move in accordance with the on / off state of the switch.

[0033] Next, a description will be given of Reference Example 2 of the present invention. FIG.
FIG. 7 is a configuration diagram showing a battery pack using a secondary battery that also uses the charge / discharge control circuit of Reference Example 2 ; In the figure,
The same components as those in the first embodiment are denoted by the same reference numerals. Further, the difference between the reference example 1 and the reference example 2 is that a mechanical switch, for example, a micro switch 9 is used instead of the reed switch 6.

That is, 1 is a secondary battery, 2 is a voltage detection control circuit, 3 is a power control circuit, 4a and 4b are output terminals, 9 is a micro switch, and the voltage detection control circuit 2, the power control circuit 3, and the micro switch. The switch 9 forms a charge / discharge control circuit 7.

The positive terminal of the secondary battery 1 is connected to the output terminal 4a and to the voltage detection control circuit 2 via the microswitch 9, and the negative terminal is connected to the voltage detection control circuit 2 and the power control circuit. Output terminal 4b via 3
It is connected to the. The power control circuit 3 controls the current between the secondary battery 1 and the output terminal 4b based on the control signal from the voltage detection control circuit 2, and the power supply from the secondary battery 1 to the voltage detection control circuit 2 If not, the voltage detection control circuit 2
From the power control circuit 3, the secondary battery 1 and the output terminal 4
b is electrically disconnected.

Each of the above-described components is housed in a case 31 having an open corner as shown in FIG. 7 to constitute a battery pack 30.
Output terminals 4a and 4b are provided on one side surface adjacent to 1a.

Further, the microswitch 9 is arranged near the opening 31a so that the microswitch 9 is turned on when a charger or a host device 40 having a shape adapted to the battery pack 30 is mounted in the opening 31a. ing.

According to the above configuration, the battery pack 3
When 0 is mounted on the host device 40, the protrusion 41 of the host device 40 is inserted into the opening 31a of the battery pack 30 as shown in FIG. 7, and the protrusion 41 comes into contact with the microswitch 9 to turn on the microswitch 9. State. Thus, the secondary battery 1 is connected to the voltage detection control circuit 2 via the microswitch 9, and the voltage between the terminals of the secondary battery 1 is detected by the voltage detection control circuit 2.

When this detection voltage becomes equal to or more than a predetermined upper limit value or equal to or less than a lower limit value, and the rechargeable battery is about to be overcharged or overdischarged, a control signal is output from the voltage detection control circuit 2. , The secondary battery 1 by the power control circuit 3
The flow of current between the power supply and the output terminal 4b is interrupted. Thereby, the secondary battery 1 does not enter an overcharged state or an overdischarged state, and the characteristic deterioration of the secondary battery 1 is prevented.

When the battery pack 30 is removed from the host device 40 when not in use, the host device 40
Is separated from the opening 31a, so that the microswitch 9 is turned off. As a result, the power supply from the secondary battery 1 to the voltage detection control circuit 2 is cut off, the wasteful power consumption by the voltage detection control circuit 2 is suppressed, and the discharge current of the secondary battery 1 when it is not in use is reduced inside the battery element. Only the self-discharge, and the time to reach the overdischarge state becomes longer than before.

Further, since the micro switch 9 is turned on and off by the protruding portion 41, it can be used only by the host device 40 compatible with the battery pack 30, so that accidents due to misuse can be prevented. Safety can be improved.

Next, a second embodiment of the present invention will be described.
FIG. 8 is a configuration diagram showing the second embodiment . Configuration of the battery pack 30 in this embodiment is substantially the same manner as in Reference Example 2 described above, differences between the Reference Example 2 and the second embodiment will be off the microswitch 9 by a slide switch provided in the host apparatus 40 That's what I did.

That is, in the figure, reference numeral 42 denotes an operation start switch (power switch) of the host device 40, which is composed of, for example, a sliding slide switch. One end of the operation start switch 42 faces an opening 43 provided corresponding to the opening 31a of the battery pack 30.
When the switch is turned on, one end 42a of the switch 42 is inserted into the opening 31a as the switch 42 slides, and presses the microswitch 9.

According to the above configuration, the battery pack 3
Only when 0 is attached to the host device 40 and the operation start switch 42 is turned on, power is supplied from the secondary battery 1 of the battery pack 30 to the host device, and the secondary battery 1 is supplied to the host device via the microswitch 9. The voltage detection control circuit 2 is energized to perform charge / discharge control.

Therefore, even when the battery pack 30 is mounted on the host device 40, the operation start switch 42
Is off, the power supply from the secondary battery 1 to the host device 40 is cut off, and the microswitch 9 is turned off, so that the power supply from the secondary battery 1 to the voltage detection control circuit 2 is also cut off. Unnecessary power consumption by the voltage detection control circuit 2 is suppressed, and the discharge current of the secondary battery 1 when not in use is only self-discharge inside the battery element, and the time to reach the overdischarge state is longer than before. Become.

In the second embodiment , the operation start switch 42 of the host device 40 is a slide switch. However, the present invention is not limited to this. The operation start switch 42 may be a push button type, a seesaw type, or a rotary type. However, the same effect can be obtained by configuring so that the microswitch 9 can be turned on / off in accordance with the on / off state of the switch.

In the first and second embodiments described above, the reed switch 6 or the micro switch 9 is provided between the voltage detection control circuit 2 and the positive electrode of the secondary battery 1, but is provided between the voltage detection control circuit 2 and the negative electrode. Has the same effect. Further, the power control circuit 3 may be provided on the positive electrode side.

In this embodiment, the battery packs 10 and 30 each include one rechargeable battery 1 and include one corresponding voltage detection control circuit 2. However, the present invention is not limited to this. In the case where a plurality of secondary batteries 1 are provided and a plurality of voltage detection control circuits 2 are provided correspondingly, a reed switch 6 or a micro switch is provided for each of these voltage detection control circuits 2 as shown in FIG. The same effect can be obtained by providing the switch 9.

Further, as shown in FIG. 10, the charging path and the discharging path are different, and a power control circuit 3a for charging and a power control circuit 3b for discharging are provided correspondingly to these paths. Even when the operation of the charging and discharging power control circuits 3a and 3b is controlled by a signal,
The same effect can be obtained by providing the reed switch 6 or the micro switch 9 between the secondary battery 1 and the voltage detection control circuit 2.

[0050]

As described above, the first aspect of the present invention is as follows.
According to the method for preventing overdischarge of a secondary battery described in the above,
When Reapack is not attached to the host device
The battery pack switch is off.
Therefore, the secondary battery and the voltage detection control circuit are shut off.
Therefore, the power of the secondary battery is not consumed. Previous
Not only when the upper device of the battery pack is not installed but also when it is installed
Even when the operation start switch is in the off state
Because the battery pack switch is off,
The power of the secondary battery is not consumed. In addition,
Turn on the operation start switch and discharge the secondary battery.
Starts, the voltage detection control circuit sets a predetermined voltage value.
When detected, the current to the power control circuit is interrupted.
To prevent the secondary battery from consuming extra power.
You. Thus, the host device of the battery pack
The battery power of the secondary battery can be
No extra power is consumed, leading to overdischarge
And prevent deterioration of secondary battery characteristics.
Wear.

Further , the secondary battery according to claim 2 is prevented from being over-discharged.
According to the stopping method, the host device of the battery pack
When the battery pack is not mounted, the lead
The switch is off, the secondary battery and the voltage detection
The control circuit is shut off and the power of the secondary battery is consumed.
It will not be done. Host device of the battery pack
Even when wearing, when the operation start switch is in the off state
The reed switch of the battery pack is off
Therefore, the power of the secondary battery is not consumed. Ma
The operation start switch is turned on, and the secondary power
Even when the discharge of the pond starts, the voltage detection control circuit
When the voltage value is detected, the current to the power control circuit is cut off.
To prevent the secondary battery from consuming extra power.
I'm here. Thus, the upper part of the battery pack
Regardless of whether or not the secondary device is attached,
The power of the pond is not consumed excessively,
To prevent deterioration of the characteristics of the secondary battery.
Can be. In addition, provided for the reed switch
Of the reed switch by the magnetic force from the generated magnetic force
Since the on / off state can be changed, the battery pack
Can only be used with a compatible charger or host device
No accidents due to misuse prevent accidents
Performance can be improved.

In addition, the secondary battery according to claim 3 is prevented from being over-discharged.
According to the stopping method, the host device of the battery pack
When not attached, the battery pack
The switch is off, and the secondary battery and the voltage detection
The output control circuit is shut off, and the power of the secondary battery is turned off.
It will not be spent. Upper device of the battery pack
Even during mounting, the operation start switch is in the off state.
When the micro switch of the battery pack is turned off,
Therefore, the power of the secondary battery is not consumed.
No. Further, the operation start switch is turned on, and the
Even when the discharge of the secondary battery starts, the voltage detection control circuit
When a predetermined voltage value is detected, a current to the power control circuit is detected.
So that the secondary battery consumes extra power
Is preventing. Thus, the battery pack
When the upper device is mounted or not mounted,
The power of the rechargeable battery is not consumed
Prevents deterioration of secondary battery characteristics without reaching discharge state
can do. Further, the operation start switch is switched
Ride to the ON state and open the upper device
The operation start switch to the opening of the battery pack.
When one end of the microphone is inserted, the one end is connected to the microphone.
Switch on, so that the battery pack
It can only be used with the combined charger or host device.
Can prevent accidents due to misuse and safety
Can be improved.

In the battery pack according to the fourth aspect,
According to the battery pack,
When not attached, switch on the battery pack
Is off, and the secondary battery and the voltage detection control circuit
The road is blocked, and the power of the secondary battery is consumed
Nothing. When the host device of the battery pack is not mounted
Not only when mounting, but also when
When in the off state, the switch of the battery pack is
Since it is off, the power of the secondary battery is not consumed.
No. Further, the operation start switch is turned on, and the
Even when the discharge of the secondary battery starts, the voltage detection control circuit
Upon detecting a predetermined voltage value, the current to the power control circuit
So that the secondary battery consumes extra power
Is preventing. Thus, the battery pack
When the upper device is mounted or not mounted,
The power of the rechargeable battery is not consumed
Prevents deterioration of secondary battery characteristics without reaching discharge state
can do.

Further, according to the battery pack of the fifth aspect,
According to the fourth aspect, in addition to the effect of the fourth aspect, the battery
Use only with a charger or host device that conforms to the
Can prevent accidents due to misuse.
Safety can be improved.

Further, according to the battery pack of the sixth aspect,
According to the fourth aspect, in addition to the effect of the fourth aspect, the battery
Use only with a charger or host device that conforms to the
Can prevent accidents due to misuse.
Safety can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a battery pack according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

FIG. 3 is a diagram illustrating the structure and operation of a first embodiment of the present invention;

FIG. 4 is a diagram for explaining the operation of Embodiment 1 of the present invention;

FIG. 5 is a configuration diagram showing a first embodiment of the present invention.

FIG. 6 is a configuration diagram showing a battery pack according to a second embodiment of the present invention.

FIG. 7 is a view for explaining the structure and operation of Embodiment 2 of the present invention;

FIG. 8 is a diagram illustrating the structure and operation of a second embodiment of the present invention.

FIG. 9 is a configuration diagram showing another embodiment of the present invention.

FIG. 10 is a configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Secondary battery, 2 ... Voltage detection control circuit, 3 ... Power control circuit, 3a ... Charging power control circuit, 3b ... Discharge power control circuit, 4a, 4b ... Output terminal, 5 ... Charge / discharge control circuit, 6
... reed switch, 7 ... charge / discharge control circuit, 8 ... case,
9 Micro switch, 10, 30 Battery pack, 20, 40 Host device, 21 Magnet, 22, 42
Operation start switch, 31: case, 31a: opening, 4
1. Projection, 43 ... Opening.

Continuation of front page (56) References JP-A-5-115129 (JP, A) JP-A-1-235169 (JP, A) JP-A-4-14361 (JP, U) JP-A-2-55169 ( Microfilm (JP, U) (58) Field of investigation (Int. Cl. ⁷ , DB name) H01M 10/42- 10/48 H01M 2/10

Claims (6)

(57) [Claims] 1. A power supply having an operation start switch.
Detachable to and from the target host device
A configured case and a secondary battery arranged in the case
And the voltage between the terminals of the secondary battery by a voltage detection control circuit.
From the secondary battery based on the detection result.
A charge / discharge detection circuit for controlling current to the
Connected between the control circuit and the secondary battery
Battery pack with switch that works with the switch
A overdischarge prevention method for a secondary battery in the battery pack is in the mounted state to the host device
Only when the operation start switch is turned on,
That the switch of the battery pack in the ON state
A method for preventing overdischarge of a secondary battery, comprising: 2. A magnet having a magnet at an end thereof, wherein said magnet slides.
Adjacent to the battery pack mounting part of the host device
The disposed slide switch is referred to as the operation start switch.
And the switch of the battery pack
As a reed switch, the battery pack is mounted on the host device,
Only when the operation start switch is ON, the magnet is
Approaching the reed switch, emitted from the magnet
By a magnetic force, the turning on the reed switch
The method for preventing overdischarge of a secondary battery according to claim 1. 3. The operation start switch is turned on.
Sometimes, one end of the operation start switch is
Project through an opening provided at a predetermined position in the
Slide switch that is arranged
When used as a switch and attached to the host device
An opening at a position facing the opening of the upper device.
Switch as a battery pack
The battery pack is attached to the host device,
Is the operation start Suitchigasu ride before being turned on
From the opening of the host device to the opening of the battery pack
When one end of the operation start switch is inserted into
Patent that the one end to turn the micro switch
The method for preventing overdischarge of a secondary battery according to claim 1, wherein: 4. It is detachable from a host device to which power is supplied.
Has a case configured in the case, in the case, the secondary battery
Detects a voltage between terminals and generates a control signal based on the voltage between terminals.
An output voltage detection control circuit, the secondary battery and power supply
Terminal and connected to the terminal based on the control signal.
Power control for controlling current between a battery and the power supply terminal
Control circuit to control overdischarge and overcharge of the secondary battery.
Battery pack having a charge / discharge control circuit
And interlocked with an operation start switch provided in the higher-level device.
The functioning switch is connected to the secondary battery and the voltage detection control circuit.
Battery connected to a road
pack. 5. A reed switch as said switch.
The surface of the host device facing the battery pack mounting surface
JP said reed switch adjacent are arranged
5. The battery pack according to claim 4, wherein: 6. A micro switch as said switch.
And a surface of the upper device facing the battery pack mounting surface.
It has an opening at a predetermined position, and a micros
5. The device according to claim 4, wherein a switch is arranged.
Battery pack.