JP4435000B2 - Battery control circuit, electronic device equipped with the battery control circuit, charge control program, and charge control method - Google Patents

Description

  The present invention relates to a charging circuit that charges a battery with externally supplied power, an output voltage detection circuit that detects an output voltage of the battery, and a charging circuit based on an output voltage signal of the battery that is output from the output voltage detection circuit. The present invention relates to a battery control circuit including a charge control circuit that performs start and stop control, an electronic device including the battery control circuit, a battery charge control program, and a battery charge control method.

  Batteries that can be repeatedly charged and discharged, such as lithium ion batteries, are widely used as power sources for small electronic devices that are particularly easy to carry. Here, a problem in using a battery-driven electronic device is that the power that can be supplied to the electronic device is limited as long as only the battery is used as a power source. When using such an electronic device, the user checks the remaining amount of battery power as necessary and uses the remaining time considering how much time is available. Therefore, it is necessary to guarantee to some extent the time during which an electronic device can be driven by a battery having a certain capacity.

  However, if the battery performance is degraded due to deterioration of the cells inside the battery, the time during which the electronic device can be driven may be extremely short as compared to the same fully charged normal battery. In addition, a battery in which deterioration of a cell inside the battery or the like has occurred may be overcharged during charging and may be ruptured. For this reason, in a battery control circuit that executes control for charging the battery, the battery deterioration due to the deterioration of the cells inside the battery is detected promptly, the user is notified of this, and charging is immediately stopped. It is necessary to execute appropriate control.

  As an example of conventional technology for detecting that battery performance has deteriorated due to deterioration of cells inside the battery, in a fuel cell in which a plurality of single cells (cells) are connected in series, one of the single cells breaks down the electrode. A method of determining that any single battery (cell) has deteriorated by detecting a steep and minute temporary voltage drop that occurs when the battery deteriorates due to, for example, is known (see, for example, Patent Document 1). . There is also a known charging device that determines whether or not a battery has deteriorated based on whether or not the output voltage of the battery at the time when a predetermined time has elapsed from the start of charging has reached a predetermined voltage (see, for example, Patent Document 2).

JP 57-111962 A JP-A-6-178454

However, in the prior art disclosed in Patent Document 1, the battery output voltage must always be monitored, and the deterioration of the single battery (cell) can be detected only when the single battery (cell) deteriorates. If a single battery (cell) deteriorates when it fails to be detected, there is a problem that it cannot be detected with the deterioration thereafter.
In the prior art disclosed in Patent Document 2, the predetermined voltage to be compared when a predetermined time elapses from the start of charging is approximately 90% of that at the time of full charging at which the increase in battery voltage due to charging is substantially flat. This is a voltage corresponding to the voltage when the battery is charged. In other words, battery deterioration cannot be detected for a long time until charging at around 90% of full charge, and overcharging is performed as described above by continuing charging the deteriorated battery for a long time. The battery may burst.

  The present invention has been made in view of such a situation, and its problem is to quickly detect a decrease in battery performance due to deterioration or the like in charge control of the battery, and to detect the deterioration of the battery due to overcharge of the deteriorated battery. This is to reduce the risk of rupture or the like.

  To achieve the above object, according to a first aspect of the present invention, there is provided a charging circuit that charges a battery with power supplied from the outside, an output voltage detection circuit that detects an output voltage of the battery, and the output voltage detection circuit. A charge control circuit that executes start and stop control of the charge circuit based on an output voltage signal of the battery that is output from the battery, wherein the charge control circuit is immediately after the start of charging by the charge circuit. When the output voltage of the battery is substantially stabilized after the charge is stopped, the output voltage of the battery is stored as an initial voltage, and then the charging by the charging circuit is resumed. It is determined whether or not the difference between the output voltage of the battery and the initial voltage at the time when the charging time has passed exceeds a predetermined voltage α. If the difference is less than the predetermined voltage α, the battery is deteriorated. Judgment This is a battery control circuit characterized by that.

  First, in order to acquire the initial voltage for determining the deterioration of the battery immediately after the start of charging, the charging is once stopped and the process waits until the output voltage of the battery is stabilized. If the battery consumes little power due to the load, the battery output voltage should stabilize in a short time. When the battery output voltage is substantially stabilized, the battery output voltage is stored as an initial voltage. After the initial voltage is stored, charging of the battery is resumed. When the first charging time has elapsed since the resumption of charging, the voltage difference between the battery output voltage at that time and the stored initial voltage is calculated and calculated. It is determined whether the measured voltage difference exceeds a predetermined voltage α.

  That is, in a normal battery, an increase in output voltage exceeding a certain voltage (predetermined voltage α) should occur due to charging for a certain time (first charging time). Conversely, in a deteriorated battery, a constant voltage (predetermined voltage) No voltage increase exceeding α) occurs. Therefore, when the first charging time has elapsed since the resumption of charging, whether the battery is normal or not is deteriorated depending on whether or not the voltage difference between the output voltage of the battery and the stored initial voltage exceeds the predetermined voltage α. You can determine whether you are doing.

  Here, the first charging time is such that the voltage difference between the initial voltage and the battery output voltage exceeds the predetermined voltage α when the battery is normal, and is lower than the predetermined voltage α when the battery is deteriorated. Is set to the charging time. In other words, if the battery is normal, it is a time for the battery output voltage to rise to a voltage exceeding the predetermined voltage α by charging. It is time not to rise. The first charging time and the predetermined voltage α are different times depending on specifications such as battery type and charge / discharge characteristics. In order to detect battery deterioration with higher accuracy, set the first charging time as long as possible so that the voltage difference differs greatly between when the battery is normal and when it is deteriorated. It is preferable to set the predetermined voltage α to a high voltage.

  When the difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after the resumption of charging is equal to or less than the predetermined voltage α, it is determined that the battery has deteriorated. Thereby, the deterioration of the battery can be detected promptly at an early stage immediately after the start of charging the battery. Therefore, by notifying the user to that effect or immediately stopping charging at that time, it is possible to prevent the possibility of battery explosion due to overcharging with a high probability.

As a result, according to the battery control device of the first aspect of the present invention, it is possible to quickly detect a decrease in battery performance due to battery deterioration or the like at an early stage immediately after the start of charging. As a result, it is possible to reduce the possibility that an unexpected situation such as the battery after charging has been unexpectedly short time due to deterioration of the battery can be reduced.
In addition, since the possibility of battery rupture due to overcharge can be prevented with a high probability, the risk of battery rupture due to overcharge of a deteriorated battery can be reduced in battery charge control. The effect is obtained.

  According to a second aspect of the present invention, in the first aspect described above, the battery has a configuration in which a plurality of cells are connected in series, and the charge control circuit performs the first charging time after charging is resumed. When the difference between the output voltage of the battery and the initial voltage when the time elapses is a predetermined voltage α or less, it is determined that the battery has deteriorated, and the battery has deteriorated from the voltage difference. It is a battery control circuit characterized by specifying the number of cells.

  In a battery having a configuration in which a plurality of cells (single cells) are connected in series, the difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after resuming charging, depending on the number of deteriorated cells. Therefore, the number of deteriorated cells in the battery can be specified from the voltage difference. As a result, it becomes possible to easily and reliably replace a deteriorated cell.

  According to a third aspect of the present invention, in the first aspect or the second aspect described above, the charge control circuit is configured such that the output voltage of the battery and the initial value when the first charge time elapses after resumption of charging. When the difference from the voltage exceeds the predetermined voltage α, the charging is continued as it is, and when the second charging time has elapsed from the start of charging by the charging circuit, the output voltage of the battery exceeds the predetermined voltage β. In the battery control circuit, it is determined whether or not the battery is deteriorated when the voltage is equal to or lower than the predetermined voltage β.

  In normal batteries, the output voltage should exceed a certain voltage (predetermined voltage β) by charging for a certain time (second charging time). Conversely, in a deteriorated battery, the output voltage does not exceed a certain voltage (predetermined voltage β). . Therefore, when the second charging time has elapsed from the start of charging, it is possible to determine whether the battery is normal or deteriorated depending on whether or not the output voltage of the battery at that time exceeds the predetermined voltage β. it can.

  Here, the second charging time is when the output voltage of the battery exceeds the predetermined voltage β when the battery is normal when the second charging time has elapsed from the start of charging, and the battery has deterioration or the like. Is set to a charging time that is equal to or less than the predetermined voltage β. That is, if the battery is normal, it is the time for the battery output voltage to rise to a voltage exceeding the predetermined voltage β by charging. If the battery is deteriorated, the battery output voltage to a voltage exceeding the predetermined voltage β by charging. It is time not to rise. The second charging time and the predetermined voltage β are different times depending on specifications such as the type of battery and charge / discharge characteristics.

  The second charging time is set to be longer than the first charging time described above. That is, when it is determined whether or not the difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after resumption of charging of the battery exceeds the predetermined voltage α, the battery deteriorates. However, if the battery has deteriorated during the subsequent charging process, the battery deterioration can be detected when the second charging time has elapsed since the start of charging. Therefore, since the deterioration of the battery can be detected with higher accuracy, it is possible to further reduce the risk of the battery bursting due to overcharging of the deteriorated battery.

  According to a fourth aspect of the present invention, in the third aspect described above, the battery has a configuration in which a plurality of cells are connected in series, and the charge control circuit is configured to start from the start of charging by the charging circuit. If the output voltage of the battery is equal to or lower than the predetermined voltage β when the charging time has elapsed, it is determined that the battery has deteriorated, and the number of cells in which the battery has deteriorated is identified from the voltage. This is a battery control circuit characterized by that.

  In a battery having a configuration in which a plurality of cells (unit cells) are connected in series, the output voltage of the battery at the time when the second charging time has elapsed after the resumption of charging differs depending on the number of deteriorated cells. Therefore, the number of deteriorated cells in the battery can be specified from the output voltage of the battery at the time when the second charging time has elapsed after the resumption of charging. As a result, it becomes possible to easily and reliably replace a deteriorated cell.

  A fifth aspect of the present invention is an electronic device including the battery control circuit according to any one of the first to fourth aspects described above.

  According to the electronic device according to the fifth aspect of the present invention, the operational effect of the invention according to any one of the first to fourth aspects described above can be obtained in the electronic device.

According to a sixth aspect of the present invention, there is provided the output voltage detection circuit of the battery control circuit including a charging circuit that charges the battery with power supplied from the outside and an output voltage detection circuit that detects the output voltage of the battery. A charge control program for causing a computer to execute start and stop control of the charging circuit based on an output voltage signal of the battery to be output, the procedure for temporarily stopping charging immediately after the charging circuit starts charging, and charging stop Later, when the output voltage of the battery is substantially stabilized, the procedure of resuming charging by the charging circuit after storing the output voltage of the battery as an initial voltage, and the time when the first charging time has elapsed after resuming charging A procedure for determining whether or not a difference between the output voltage of the battery and the initial voltage exceeds a predetermined voltage α, and the battery is deteriorated when the difference is not more than the predetermined voltage α. A charge control program characterized by having a determination procedure.
According to the charge control program described in the sixth aspect of the present invention, the same effect as that of the invention described in the first aspect described above is brought to any battery control circuit capable of executing this charge control program. Can do.

According to a seventh aspect of the present invention, there is provided a method for controlling charging of a battery, the step of temporarily stopping charging immediately after starting charging, and the output voltage of the battery when the output voltage of the battery is substantially stabilized after stopping charging. Whether or not the difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after the resumption of charging exceeds a predetermined voltage α. And a step of determining that the battery has deteriorated when the voltage is equal to or lower than the predetermined voltage α.
According to the charge control method described in the seventh aspect of the present invention, it is possible to obtain the same effects as those of the invention described in the first aspect.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram showing a power supply system of an electronic apparatus provided with a “battery control circuit” according to the present invention.
The power supply line Vcc is supplied with power from an external AC adapter 10 and a lithium ion battery pack 20 (hereinafter referred to as a battery pack 20) that is detachably incorporated. The AC adapter 10 performs AC-DC conversion of AC power (such as AC100V) to DC power (DC20V). The DC power output from the AC adapter 10 is supplied to the power supply line Vcc via the diode D1. The battery pack 20 incorporates a plurality of lithium ion batteries (not shown, hereinafter referred to as “cells”) as “cells (single cells)”, and a DC power of about 16.8 V in a fully charged state. Is output. The DC power output from the battery pack 20 is supplied to the power supply line Vcc via the diode D2.

  That is, power supply from the AC adapter 10 and power supply from the battery pack 20 are diode-ORed by the diode D1 and the diode D2 and supplied to the power supply line Vcc. The power supplied to the power supply line Vcc is supplied to a drive system such as a DC motor, and is converted into a control voltage (3.3 V) by the DC-DC converter 30 to be a control circuit 100 as a “charge control circuit”. Etc. A power switch 35 is disposed on the power line Vcc, and the power supply line Vcc is directly connected / disconnected at the contact point of the power switch 35 to turn on / off the electronic device.

  The battery control circuit 50 according to the present invention includes a charging circuit 21 that charges a battery with DC power supplied from the AC adapter 10, and an A / D conversion as an “output voltage detection circuit” that detects an output voltage of the battery pack 20. And a control circuit 100 as a “charge control circuit” that performs start and stop control of the charging circuit 21 based on the output voltage signal of the battery pack 20 output from the A / D conversion circuit 22. .

The charging circuit 21 performs charging of the battery pack 20 using DC 20V power supplied from the AC adapter 10 via the diode D3.
The A / D conversion circuit 22 divides the output voltage of the battery pack 20 by a predetermined voltage division ratio, converts it to a voltage value of a digital signal, and outputs it to the control circuit 100. In this embodiment, the A / D conversion circuit 22 divides the voltage difference of 0 to 17V into 3.3V, and then converts it into a digital signal with a resolution of 10 bits. Therefore, the output voltage of the battery pack 20 can be detected in units of about 16.618 mV.

  The power supply detection circuit 23 detects the presence / absence of power supply from the AC adapter 10 and the attachment / detachment state of the battery pack 20, and outputs each detection state (power supply detection signal) to the control circuit 100. The attachment / detachment state of the battery pack 20 is detected from the short-circuit state of the short terminal S that is short-circuited to GND when the battery pack 20 is attached. Based on the power supply detection signal output from the power supply detection circuit 23, the control circuit 100 is in a state where power is supplied from the AC adapter 10, and the output voltage of the attached battery pack 20 is below a certain voltage. When the voltage drops, the activation control of the charging circuit 21 is executed. In addition, the control circuit 100 is configured to switch the power switch from the power switch contact signal when the power is not supplied from the AC adapter 10 and the output voltage of the battery pack 20 that is mounted falls below a certain voltage. Similarly to the case where the power-off operation of the electronic device by 35 is detected, the power of the electronic device is turned off after predetermined backup control.

FIG. 2 is a flowchart showing a procedure for starting and stopping control of the charging circuit 21 in the control circuit 100.
First, the charging circuit 21 is activated when power is supplied from the AC adapter 10 and when the output voltage of the attached battery pack 20 drops below a certain voltage (step S1). Subsequently, it is determined based on the power detection signal output from the power detection circuit 23 whether or not the power supply from the AC adapter 10 is continued (step S2). When there is no power supply from the AC adapter 10 (No in step S2), the charging to the battery pack 20 cannot be continued. At that time, the charging circuit 21 is stopped (step S5). Exit.

  When the power supply from the AC adapter 10 is continued (Yes in Step S2), it is subsequently determined whether or not the state where the battery pack 20 is attached is maintained (Step S3). If the battery pack 20 has been removed (No in step S3), charging to the battery pack 20 cannot be continued. At that time, the charging circuit 21 is stopped (step S5) and the procedure is repeated. finish. If the state in which the battery pack 20 is attached is maintained (Yes in step S3), it is subsequently determined whether or not the state of charge of the battery pack 20 has reached full charge (step S4). If the state of charge of the battery pack 20 has not reached full charge (No in step S4), the process returns to step S2, and charging of the battery pack 20 by the charging circuit 21 is continued. Then, when the state of charge of the battery pack 20 reaches full charge (Yes in step S4), the charging circuit 21 is stopped (step S5).

FIG. 3 is a flowchart showing a procedure for detecting deterioration of the battery pack 20. The procedure is a procedure executed when the charging circuit 21 is activated.
FIG. 4 is a timing chart schematically showing a change in the output voltage of the battery pack 20 immediately after the start of charging.
First, immediately after the charging circuit 21 is activated, the charging circuit 21 is temporarily stopped to stop charging the battery pack 20 (step S11 in FIG. 3, timing T1 in FIG. 4), and the charging is stopped for 10 seconds. Wait (step S12 in FIG. 3). The time of 10 seconds is a time sufficient for the output voltage of the battery pack 20 to be substantially stabilized after the charging is stopped. Subsequently, the output voltage of the battery pack 20 at this time is stored as the initial voltage V1 (step S13 in FIG. 3, timing T2 in FIG. 4), and then the charging circuit 21 is restarted to charge the battery pack 20. The process is resumed (step S14 in FIG. 3).

  When 10 seconds (first charging time) have elapsed since recharging of the battery pack 20 (step S15 in FIG. 3, timing T3 in FIG. 4), the output voltage of the battery pack 20 at that time is detected as the output voltage V2. (Step S16 in FIG. 3). Then, it is determined whether or not the difference (V2−V1) between the output voltage V2 and the initial voltage V1 is larger than the predetermined voltage α (step S17 in FIG. 3). If the difference between the output voltage V2 and the initial voltage V1 is equal to or less than the predetermined voltage α (No in step S17 in FIG. 3), it is determined that the battery pack 20 has deteriorated, and the output voltage V2 and the initial voltage V1 are The number of deteriorated cells of the battery pack 20 is specified from the difference (V2−V1). And the charging circuit 21 is stopped (step S21 of FIG. 3), the charge to the battery pack 20 is stopped, and the said procedure is complete | finished.

  That is, the normal battery pack 20 should have an output voltage exceeding a certain voltage (predetermined voltage α) by charging for a certain time (first charging time). No voltage rise exceeding the voltage (predetermined voltage α) occurs. Therefore, when the “first charging time” (10 seconds) has elapsed since the resumption of charging, whether the voltage difference between the output voltage V2 of the battery pack 20 and the stored initial voltage V1 at that time exceeds the predetermined voltage α. Whether or not the battery pack 20 is normal or deteriorated can be determined depending on whether or not it is.

  The battery pack 20 has a configuration in which a plurality of cells are connected in series. Depending on the number of deteriorated cells, the battery pack 20 at the time when 10 seconds (first charging time) has elapsed after resuming charging. Since the difference between the output voltage V2 and the initial voltage V1 is different, the number of deteriorated cells in the battery pack 20 can be specified from the voltage difference. As a result, it becomes possible to easily and reliably replace a deteriorated cell.

  The “first charging time” (10 seconds) is a voltage at which the voltage difference (V2−V1) between the initial voltage V1 and the output voltage V2 of the battery pack 20 exceeds the predetermined voltage α when the battery pack 20 is normal. (The voltage V2n in FIG. 4), and when the battery pack 20 is deteriorated, the charging time is set to a voltage equal to or lower than the predetermined voltage α (voltage V2f in FIG. 4). The “first charging time” and the predetermined voltage α are different times depending on the type of the battery pack 20 and specifications such as charge / discharge characteristics. In order to detect the deterioration of the battery pack 20 with higher accuracy, the “first charging time” is as much as possible so that the voltage difference is greatly different between when the battery pack 20 is normal and when it is deteriorated. It is preferable to set the predetermined voltage α to a large voltage by setting a long time.

On the other hand, if the difference between the output voltage V2 and the initial voltage V1 is larger than the predetermined voltage α (Yes in step S17 in FIG. 3), the charging is continued until 2 minutes (second charging time) elapses from the start of charging. (Step S18 in FIG. 3), the output voltage of the battery pack 20 when 2 minutes have elapsed from the start of charging is detected as the output voltage V3 (Step S19 in FIG. 3, timing T4 in FIG. 4).
The “second charging time” (2 minutes) is the output voltage of the battery pack 20 when the “second charging time” elapses from the start of charging. If the battery pack 20 is normal, the predetermined voltage β (13. 5V) (voltage V3n in FIG. 4), and when the battery pack 20 is deteriorated, the charging time is set to a voltage equal to or lower than the predetermined voltage β (voltage V3f in FIG. 4). The “second charging time” and the predetermined voltage β are different times depending on the type of the battery pack 20 and specifications such as charge / discharge characteristics.

  Then, it is determined whether or not the detected output voltage V3 exceeds 13.5 V (predetermined voltage β) (step S20 in FIG. 3). If the output voltage V3 exceeds 13.5 V (Yes in step S20 in FIG. 3, voltage V3n in FIG. 4), it is determined that the battery pack 20 has not deteriorated, and the procedure is terminated as it is. If the output voltage V3 is 13.5 V or less (No in step S20 in FIG. 3, voltage V3f in FIG. 4), it is determined that the battery pack 20 has deteriorated and 13.5 V (predetermined voltage β). The number of deteriorated cells of the battery pack 20 is specified from the voltage difference with the output voltage V3f. And the charging circuit 21 is stopped (step S21 of FIG. 3), the charge to the battery pack 20 is stopped, and the said procedure is complete | finished.

  That is, in the normal battery pack 20, the output voltage should exceed a certain voltage (predetermined voltage β) by charging for a certain time (second charging time). Conversely, in the deteriorated battery pack 20, the constant voltage (default) The voltage β) is not exceeded. Therefore, when the “second charging time” (2 minutes) has elapsed from the start of charging, the battery pack 20 is normal depending on whether or not the output voltage V3 of the battery pack 20 at that time exceeds the predetermined voltage β. It can be determined whether it is degraded or not.

  The battery pack 20 has a configuration in which a plurality of cells are connected in series. Depending on the number of deteriorated cells, the output of the battery pack 20 at the time when 2 minutes (second charging time) has elapsed from the start of charging. Since the difference between the voltage V3 and the predetermined voltage β (13.5V) is different, the number of deteriorated cells in the battery pack 20 can be specified from the voltage difference. As a result, it becomes possible to easily and reliably replace a deteriorated cell.

As described above, according to the battery control circuit 50 of the present invention, the battery pack 20 is quickly deteriorated at an early stage immediately after the start of charging the battery pack 20 (in this embodiment, 20 seconds after the start of charging). It can be detected (timing T3 in FIG. 4). At that time, the user is notified of the fact and charging is immediately stopped, so that the possibility of the battery pack 20 bursting due to overcharging can be prevented with a high probability.
In addition, when the first charging time (10 seconds) has elapsed since recharging of the battery pack 20 resumed, the battery pack 20 did not deteriorate, but the battery pack 20 deteriorated during the subsequent charging process. In such a case, the deterioration of the battery pack 20 can be detected when the second charging time (2 minutes) has elapsed since the start of charging. Therefore, since the deterioration of the battery pack 20 can be detected with higher accuracy, it is possible to further reduce the risk of the battery pack 20 bursting due to overcharging of the deteriorated battery pack 20.

  In this way, in the charging control of the battery pack 20, it is possible to quickly detect a decrease in battery performance of the battery pack 20 due to deterioration or the like, and there is a risk of battery rupture due to overcharging the deteriorated battery pack 20. Can be reduced.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and they are also included in the scope of the present invention. Needless to say.

It is a power supply circuit diagram of the electronic device provided with the “battery control circuit” according to the present invention. It is the flowchart which showed the procedure of starting and a stop control of a charging circuit. It is the flowchart which showed the procedure which detects degradation of a battery pack. 6 is a timing chart showing changes in the output voltage of the battery pack.

Explanation of symbols

10 AC adapter, 20 lithium ion battery pack, 21 charging circuit, 22 A / D conversion circuit, 23 power supply detection circuit, 30 DC-DC converter, 50 battery control circuit, 100 control circuit (charge control circuit)

Claims (6)

A charging circuit that charges the battery with power supplied from the outside; an output voltage detection circuit that detects an output voltage of the battery; and an output voltage signal of the battery that is output from the output voltage detection circuit. A battery control circuit comprising a charge control circuit for executing start and stop control,
The charging control circuit once stops charging immediately after the charging circuit starts charging,
When the output voltage of the battery is substantially stabilized after the charging is stopped, the battery output voltage is stored as an initial voltage, and then charging by the charging circuit is resumed.
Determining whether the difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after resuming charging exceeds a predetermined voltage α;
If the voltage is less than the predetermined voltage α, it is determined that the battery has deteriorated ,
When the predetermined voltage α is exceeded, the charging is continued as it is, and when the second charging time has elapsed from the start of charging by the charging circuit, it is determined whether or not the output voltage of the battery exceeds the predetermined voltage β. A battery control circuit that determines and determines that the battery has deteriorated when the voltage is equal to or lower than a predetermined voltage β .   2. The battery according to claim 1, wherein the battery has a configuration in which a plurality of cells are connected in series, and the charge control circuit includes the output voltage of the battery at the time when the first charging time has elapsed after resumption of charging, and the battery. When the difference from the initial voltage is equal to or less than the predetermined voltage α, it is determined that the battery is deteriorated, and the number of deteriorated cells of the battery is specified from the voltage difference. Battery control circuit. 3. The battery according to claim 2 , wherein the battery has a configuration in which a plurality of cells are connected in series, and the charging control circuit outputs the output of the battery when a second charging time has elapsed from the start of charging by the charging circuit. A battery control circuit characterized in that, when the voltage is equal to or lower than a predetermined voltage β, the battery is determined to be deteriorated, and the number of deteriorated cells of the battery is specified from the voltage. The electronic device provided with the battery control circuit of any one of Claims 1-3 . An output voltage signal of the battery output by the output voltage detection circuit of the battery control circuit including a charging circuit that charges the battery with power supplied from the outside and an output voltage detection circuit that detects the output voltage of the battery. A charge control program for causing a computer to execute start and stop control of the charging circuit based on
A procedure for once stopping charging immediately after starting charging by the charging circuit,
A procedure for resuming charging by the charging circuit after storing the output voltage of the battery as an initial voltage when the output voltage of the battery is substantially stabilized after the charging is stopped;
A procedure for determining whether or not a difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after resuming charging exceeds a predetermined voltage α;
A procedure for determining that the battery has deteriorated when the voltage is equal to or lower than the predetermined voltage α ;
When the predetermined voltage α is exceeded, the charging is continued as it is, and when the second charging time has elapsed from the start of charging by the charging circuit, it is determined whether or not the output voltage of the battery exceeds the predetermined voltage β. A charge control program comprising: determining and determining that the battery has deteriorated if the voltage is equal to or less than the predetermined voltage β . A battery charge control method comprising:
A process of stopping charging immediately after the start of charging;
Storing the output voltage of the battery as an initial voltage when the output voltage of the battery is substantially stabilized after the charging is stopped;
Determining whether the difference between the output voltage of the battery and the initial voltage at the time when the first charging time has elapsed after resuming charging exceeds a predetermined voltage α;
A step of determining that the battery has deteriorated when the voltage is equal to or lower than the predetermined voltage α ;
When the predetermined voltage α is exceeded, the charging is continued as it is, and when the second charging time has elapsed from the start of charging by the charging circuit, it is determined whether or not the output voltage of the battery exceeds the predetermined voltage β. And a step of determining that the battery has deteriorated when the voltage is equal to or lower than the predetermined voltage β .

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