JPH07147739A - Apparatus for forcing rechargeable battery to discharge - Google Patents

Abstract

PURPOSE:To force a rechargeable battery to discharge for a proper period at a proper timing and, after that, transfer to a charging operation easily. CONSTITUTION:A control unit 2 which is driven by a rechargeable battery 1 receives a instruction 3 for forced discharge and generates a discharge signal. When the voltage of the battery 1 becomes too low to drive the control unit 2, the forced discharge is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forcibly discharging a charging battery, and more particularly to a technology of a discharge system for forcibly discharging at a suitable time and at a suitable time.

[0002]

2. Description of the Related Art The conventional forced discharge device for charging batteries is
A switch button is provided, and the switch button is operated to start forced discharge. Then, the battery voltage of the charging battery is managed, and when the voltage value drops to a certain level, the forced discharge is terminated. Generally, since the forced discharge device is often attached to a charger, it can be charged again after the forced discharge is completed.

[0003]

By the way, since it is normally up to the user of the apparatus to start the forced discharge, the switch button is not operated even at an appropriate time to start the forced discharge. Sometimes. Therefore, a memory effect occurs in the charging battery and the purpose of forced discharge cannot be achieved. On the other hand, if the switch button is frequently operated, the charging battery may be deteriorated due to repeated operations of charging and discharging. In particular, there is also a problem that if the charging battery is fully charged and forced discharge is started, the battery is forcedly discharged for a long time.

In view of the above problems, the present invention provides a charging battery that can be forcibly discharged for an appropriate time at an appropriate time to start the forced discharge, and then can easily shift to a charging operation. It is intended to provide a forced charging device.

[0005]

In order to achieve the above-mentioned object, in a forced discharge device for a charging battery according to the present invention, a control unit driven by the charging battery receives a forced discharge start command and outputs a forced discharge signal. When the voltage of the charging battery drops and the control unit is in the non-driving state, the forced discharge is terminated.

Further, the battery capacity of the charging battery is managed, and when the battery capacity reaches below the forced discharge start line, the forced discharge is started. Further, the battery capacity of the charging battery is managed for a certain period, and if the battery capacity does not reach below the forced discharge end line during that period, the forced discharge is started. Further, the battery capacity of the charging battery is managed for a certain period of time, and the battery capacity of the charging battery is suppressed during charging when the battery capacity does not reach below the forced discharge end line during that period.

Further, a time zone in which the battery capacity is least used is searched for, and when the time zone is reached, forced discharge is started. Further, even if the forced discharge start signal is received, the forced discharge is not started immediately, and then the forced discharge is started by waiting until the battery capacity is used up. In addition, the forced discharge is terminated while leaving the minimum required battery capacity.

Further, it operates when receiving the charging signal.

[0009]

Next, the operation of the forced discharge device for a charging battery according to the present invention will be described. When the control unit receives a command to start forced discharge from a switch or a determination in the control unit, the charging battery starts forced discharge. After a while, the battery voltage of the charging battery gradually decreases, the power supply to the control unit is stopped, and the forced discharge ends.

If the charging section enters during this series of processes, the charging operation starts immediately after the forced discharge is completed. At the same time, a stop command was issued to the charging section, and after a while,
The battery voltage of the charging battery drops and the power supply to the control unit is stopped, the forced discharge ends, and the stop command is released. When the amount of forced discharge is much larger than the amount of charge, the stop instruction to the charging unit may not be issued. At this time, the charge operation and the forced discharge operation are performed at the same time, but the amount of forced discharge is much larger than the amount of charge, so the voltage of the charging battery drops and power is supplied to the control unit. Stops. Then, the forced discharge is released and the charging operation is started.

[0011]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1A is an explanatory diagram of a system in which power is supplied from the charging battery 1 to the control unit 2. Here, the control unit 2 uses a switch (not shown), determination in the control unit 2, and the like. When receiving the forced discharge start command 3 from
The charging battery 1 starts forced discharge. FIG. 1B is an explanatory diagram of the system at this time. After a while from FIG. 1B, the voltage of the charging battery 1 drops, the power supply to the control unit 2 stops, and the forced discharging of the charging battery 1 ends. FIG. 1C is an explanatory diagram of the system at this time.

When the charging section 4 is turned on in the series of steps described with reference to FIGS. 1A, 1B and 1C, the charging operation starts immediately after the forced discharge. At the same time, the control unit 2 outputs a charge stop signal to the charging unit 4, and after a while, the battery voltage of the charging battery 1 decreases and the power supply to the control unit 2 is stopped, so that the charging battery 1 The forced discharge ends. If the charge stop signal is stopped or the amount of forced discharge is much larger than the amount of charge, the charge stop signal to the charging unit 4 may not be issued.

At this time, the charging operation and the forcible discharging operation are performed at the same time. However, since the amount of the forcible discharging is much larger than the amount of the charging, the voltage of the charging battery 1 drops and the control is performed. The power supply to the unit 2 is stopped.
Then, from this time, the forced discharge is released and the battery enters the charged state. FIGS. 1D to 1G are explanatory diagrams of the system when the above-described operation is performed.

FIG. 2 is a graph showing the relationship between the battery capacity of the charging battery 1 and time. In this figure, a forced discharge start line is provided so that the battery capacity of the charging battery 1 is the forced discharge start line. When the voltage drops below the level, the forced discharge signal is transmitted, and thus, the forced discharge signal can be transmitted within an appropriate time until the end of the forced discharge.

FIG. 3 (a) is a graph showing the case where the battery capacity of the charging battery 1 does not drop below the forced discharge start line even after a long time has passed. When the battery capacity of the charging battery 1 does not drop below the forced discharge start line, the forced discharge start line is set by changing the battery capacity of the charging battery 1. As a countermeasure in this case, the minimum amount of the battery capacity of the charging battery 1 in a certain past period may be set as the forced discharge start line. In addition, although there are cases where forced discharge occurs immediately, FIG. 3B is a graph showing this case.
As a countermeasure in this case, the setting may be changed to a forced discharge start line smaller by a certain capacity.

FIG. 4 is a graph showing the case where the battery capacity of the charging battery 1 is managed for a certain period of time, and the forced discharge is started when the forced discharge end line has never been reached. Since the battery capacity of the charging battery 1 may be forcibly discharged when it is fully charged, it may be provided with a forced discharge standby function so that the discharging is started to the lower limit of the next battery capacity. Further, there is a method of selecting the time for forced discharge so as not to cause trouble to the user of the charging battery 1 or reducing the time required for forced discharge. It manages the usage status of No. 1 and finds the time zone when the charging battery 1 is not used most. Then, if the forced discharge is started when the time period comes, it is effective when the use condition of the charging battery 1 is substantially constant.

After a certain amount of time has passed after the battery capacity of the charging battery 1 is used and it is confirmed that the charging battery 1 will not be used any more, forced discharge is started or the minimum required battery capacity is reached. If the forced discharge is started with the capacity left, the trouble of the user of the charging battery 1 can be reduced. In addition, it operates when receiving the charge signal, and if the forced discharge is temporarily stopped or terminated when the charge signal is not received, the battery is forcibly discharged and charged after being left for a long time. It is possible to prevent the drawback that the battery capacity of the battery 1 is lost. In order to reduce annoyance to the user of the battery 1 for charging, the method of selecting the time for forced discharge or shortening the time required for forced discharge is only available in the case shown in FIG. It is not effective, but can be adopted as an independent method.

FIG. 5 is a graph showing a case where the battery capacity of the charging battery 1 is managed for a certain period of time and the full charge amount is suppressed when the forced discharge end line has never been reached. For example, by reducing the full charge amount by the difference x between the minimum amount of the battery capacity of the charging battery 1 and the forced discharge end line for a certain period, the forced discharge end line is changed to the forced discharge end line only by making a similar change in the battery capacity. Can reach It should be noted that it is possible to set a fixed time without using a timer and count by the integrated amount of charging or the integrated amount of discharging. In addition, rechargeable battery 1
The battery capacity of can be represented by the difference between the integrated amount of charging and the integrated amount of discharging, or can be substituted by the battery voltage.

[0019]

The forced discharge device according to the present invention is constructed as described above and has the following effects. By controlling the battery capacity of the charging battery for a certain period of time to determine the presence / absence of forced discharge, and by limiting the battery capacity of the charging battery at the start of forced discharge, it is possible to force the battery at an appropriate time and within an appropriate time. The battery can be discharged, and the memory effect and deterioration of the charging battery can be prevented. In addition, when the control unit driven by the charging battery outputs a forced discharge signal and the control unit goes into a non-driving state due to a decrease in the battery voltage of the charging battery, the forced discharge is terminated and the charging state is changed from the forced discharge. There is an advantage that the operation of shifting to can be performed easily and efficiently.

[Brief description of drawings]

FIG. 1A is an explanatory diagram of a system in which power is supplied from a charging battery to a control unit, and FIG. Is an explanatory diagram of a system in which the charging battery starts forced discharge, and (c) is an explanatory diagram of a system in which the voltage of the charging battery drops and the power supply to the control unit is stopped, and the forced discharge ends, In addition, in (d) to (g), since the amount of forced discharge is much larger than the amount of charge, the voltage of the charging battery drops and the power supply to the control unit is stopped. Explanatory drawing of the system which is released and enters a charging state.

FIG. 2 is a graph showing the relationship between the battery capacity of a charging battery and time.

FIG. 3A is a graph showing a case in which the discharge does not drop below a forced discharge start line even after a long time has passed, and FIG. 3B is a graph showing a case in which forced discharge immediately occurs.

FIG. 4 is a graph showing the case where the battery capacity of the charging battery is managed for a certain period of time, and when the forced discharge end line has never been reached, forced discharge is started.

FIG. 5 is a graph showing a case where the battery capacity of the charging battery is managed for a certain period of time and the full charge amount is suppressed when the forced discharge end line has never been reached.

[Explanation of symbols]

 1 Charging battery 2 Control unit 3 Forced discharge start command 4 Charging unit

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[Procedure amendment]

[Submission date] February 14, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 14

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

When the charging section 4 is turned on in the series of processes described with reference to FIGS. 1A, 1B and 1C, the charging operation can be started immediately after the forced discharge is completed. Figure 1
In (d), the control unit 2 outputs a charging stop signal to the charging unit 4, and after a while, the battery voltage of the charging battery 1 is lowered and the power supply to the control unit 2 is stopped. The forced discharge of No. 1 is completed. At this time, the stop signal is released.
The charging battery is charged. In addition, when the amount of forced discharge is much larger than the amount of charge, FIG. 1 (f), (g)
It is not necessary to output the charging stop signal to the charging unit 4 as described above .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

FIG. 5 is a graph showing a case where the battery capacity of the charging battery 1 is managed for a certain period of time and the full charge amount is suppressed when the forced discharge end line has never been reached. For example, by reducing the full charge amount by the difference x between the minimum amount of the battery capacity of the charging battery 1 and the forced discharge end line for a certain period, the forced discharge end line is changed to the forced discharge end line only by making a similar change in the battery capacity. Can reach Incidentally, without using the timer, the predetermined time may be counted by the integrated amount of the accumulated amount and the discharge charging. In addition, the battery capacity of the rechargeable battery 1 is represented by the difference between the integrated amount of charging and the integrated amount of discharging,
It is also possible to substitute the battery voltage.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1A is an explanatory diagram of a system in which power is supplied from a charging battery to a control unit, and FIG. Is an explanatory diagram of a system in which the charging battery starts forced discharge, and (c) is an explanatory diagram of a system in which the voltage of the charging battery drops and the power supply to the control unit is stopped, and the forced discharge ends, Further, (d) ~ (g) the power supply is stopped to the control unit decreases the voltage of the battery for charging, der illustration of a system comprising a charge state forced discharge is released from the time
Of these, in (f) to (g), the amount of forced discharge is the amount of charge.
Explanatory drawing of the system at the time of being very large compared .

Claims (14)

[Claims] 1. When a control unit driven by a charging battery receives a forced discharge start command and outputs a forced discharge signal, and the battery voltage of the charging battery drops and the control unit goes into a non-driving state. A forced discharge device characterized in that forced discharge is terminated. 2. A forced discharge device for a charging battery, which manages the battery capacity of the charging battery and starts forced discharge when the battery capacity reaches below a forced discharge start line. 3. The forced discharge device for a charging battery according to claim 2, wherein the forced discharge start line is set by changing the battery capacity of the charging battery. 4. A charging battery characterized in that the battery capacity of the charging battery is managed for a certain period of time, and if the battery capacity does not reach below the forced discharge end line during that period, forced discharging is started. Forced discharge device. 5. The battery capacity of the charging battery is managed for a certain period of time, and the battery capacity of the charging battery is suppressed during charging when the battery capacity does not reach below the forced discharge end line during that period. A forced discharge device for charging batteries. 6. The forced discharge device for a charging battery according to claim 4, wherein the fixed period is calculated by integrating the charge amount. 7. The forced discharge device for a charging battery according to claim 4, wherein the fixed period is calculated by integrating the discharge amount. 8. The battery capacity of the charging battery is calculated based on the difference between the integrated value of the charged amount and the integrated value of the discharged amount, according to claim 2, claim 3, claim 4, or claim 5. A device for forcibly discharging a charging battery according to. 9. When a time zone in which the battery capacity is least used is searched and then the time zone is reached,
A forced discharge device for a charging battery, which starts forced discharge. 10. The forcing of a charging battery, wherein the forced discharging is not started immediately after receiving the forced discharging start signal, and then the forced discharging is started by waiting until the battery capacity is used up. Discharge device. 11. The forced discharge device for a charging battery according to claim 10, wherein after the battery capacity has been used, the forced discharge is started by waiting for a certain period of time. 12. A forced discharge device for a charging battery, which terminates forced discharge while leaving a minimum required battery capacity. 13. A device for forcibly discharging a charging battery, which operates when receiving a charging signal. 14. The device for forcibly discharging a charging battery according to claim 12, wherein the forced discharge is temporarily stopped or terminated when the charging signal is not received.