JP2019004534A - Charge control device, charge control method and program - Google Patents

Abstract

To provide a charge control device, a charge control method and a program, with which charging is performed with a charge system appropriate for a user in a device having a rechargeable battery.SOLUTION: A smart watch 100 having a secondary battery 34 comprises a charge control section 33 comprising: use state acquisition means for acquiring a use state of the smart watch 100; and charge control means for controlling a charge system to the secondary battery 34 on the basis of the acquired use state of the smart watch 100.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a charge control device, a charge control method, and a program.

  Conventionally, as a charging method for charging a portable device having a secondary battery (rechargeable battery, battery), normal charging and rapid charging with a charging time shorter than that of normal charging are known. However, rapid charging causes battery deterioration compared to normal charging.

  For this reason, there is known a charge control method that selectively uses rapid charging and normal charging according to the terminal voltage indicating the state of charge of the battery of the portable device (see Patent Document 1).

JP-A-7-322523

  However, in the charge control method described in Patent Document 1, proper use of normal charge and quick charge is not always appropriate for the user.

  An object of the present invention is to charge a device having a rechargeable battery by a charging method appropriate for the user.

  In order to solve the above-described problem, the charge control device of the present invention is based on a usage state acquisition unit that acquires a usage state of a device having a rechargeable battery, and a usage state of the device acquired by the usage state acquisition unit. Charging control means for controlling a charging system for the rechargeable battery.

  ADVANTAGE OF THE INVENTION According to this invention, in the apparatus which has a rechargeable battery, it can charge with a charging system suitable for a user.

(A) is a front view of the smartwatch of the embodiment of the present invention. (B) is a front view of a smartwatch showing display screens of a first display unit and a second display unit. It is a block diagram which shows the function structure of a smart watch. It is a flowchart which shows a 1st charge control process. It is a figure which shows the state of charge with respect to the elapsed time when the scheduled time in a 1st charge control process is long and not performing quick charge. (A) is a figure which shows the battery voltage with respect to the elapsed time after the full charge of a 1st charge control process, a battery current, and temperature. (B) is a figure which shows the battery voltage, battery current, and temperature with respect to the elapsed time after the full charge of the conventional charge. It is a flowchart which shows a 2nd charge control process. It is a figure which shows the state of charge with respect to the elapsed time when the scheduled time in a 2nd charge control process is long and not performing quick charge. It is a flowchart which shows a 3rd charge control process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments and modifications according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the illustrated example.

(Embodiment)
The embodiment according to the present invention will be described with reference to FIGS. First, with reference to FIG. 1 and FIG. 2, a device configuration of a smart watch 100 as a device having a rechargeable battery according to the present embodiment will be described. FIG. 1A is a front view of the smart watch 100 of the present embodiment. FIG. 1B is a front view of the smartwatch 100 showing display screens of the first display unit 12 and the second display unit 22.

  As shown in FIG. 1A, the smart watch 100 is an arm-mounted information processing apparatus that can mount the main body 1 on the user's arm using the band 2. The main body 1 of the smart watch 100 includes a frame 3, a display screen 4, a push button switch B1, and the like.

  The frame 3 exposes and supports the display screen 4 on one surface, and holds functional configurations related to various operations described later. When the push button switch B1 is pressed, the operation mode is returned from a later-described sleep mode.

On the display screen 4, two display portions are stacked. As shown in FIG. 1B, a display screen 12a of the first display unit 12 (see FIG. 2) is provided at the lower part, and a display screen 22a of the second display unit 22 (see FIG. 2) is provided at the upper part. Is provided. That is, FIG. 1A shows a state in which display is performed by the first display unit 12 and the display screen 22a of the second display unit 22 transmits the display by the first display unit 12.
A touch sensor (touch panel) (not shown) is provided at an upper part of the second display unit 22 so that a user operation can be accepted. A push button switch B1 is provided on the side surface of the frame 3 so as to be able to accept a user operation together with the touch sensor.

The first display unit 12 has a color liquid crystal display screen based on a dot matrix, and switches various displays related to various functions and / or performs them in parallel according to a user input operation or various program operations.
The second display unit 22 has a display screen that can display the time by simplified display with lower power consumption than the first display unit 12, and performs, for example, a monochrome liquid crystal display by a segment method. Alternatively, a memory in-pixel liquid crystal (MIP liquid crystal), a PN liquid crystal (Polymer Network), or the like may be used for the display screen 22a of the second display unit 22. In addition, the display screen 22a of the second display unit 22 can transmit the display content of the first display unit 12 upward without applying any display by applying a predetermined voltage.

FIG. 2 is a block diagram showing a functional configuration of the smart watch 100.
The smart watch 100 includes a main microcomputer 11, a first display unit 12, an operation reception unit 13, a wireless communication controller 14, an external storage unit 15, a sub-microcomputer 21, a second display unit 22, and a measurement unit 23. A satellite radio wave receiving module 24, a switch 25, a notification unit 26, a PMIC (Power Management Integrated Circuit) 31, an external power supply terminal 32, a charging control device (use state acquisition means, first time acquisition means, A charge control unit 33 as a second time acquisition unit, a charge control unit), a secondary battery 34 as a rechargeable battery, a temperature measurement unit 35, and the like.

  The main microcomputer 11 is a main control unit including a main CPU (Central Processing Unit) 111, a RAM (Random Access Memory) 112, a storage unit 113, a time measuring unit 114, and the like. The main microcomputer 11 receives power supply from the power supply via the PMIC 31 and controls the operations of the respective units such as the first display unit 12, the operation receiving unit 13, the wireless communication controller 14, and the external storage unit 15.

The main CPU 111 performs various arithmetic processes and controls the operation of the smart watch 100 in a normal operation state. The main CPU 111 acquires measurement data from the satellite radio wave reception module 24 and the measurement unit 23 from the sub-microcomputer 21 and performs various processes (information processing).
The RAM 112 provides a working memory space to the main CPU 111 and stores temporary data.

  The storage unit 113 is a nonvolatile memory such as a flash memory that stores control programs (including various application programs (applications)) executed by the main CPU 111 and setting data. The data stored in the storage unit 113 includes a time display program for performing time display, a program such as an application that uses a positioning result (positioning information) by the satellite radio wave receiving module 24, various data, and the like.

  The timer 114 counts the current date and time (time information) based on the control of the main CPU 111. The timer unit 114 includes a counter and counts the date and time with higher accuracy than the RTC 214 described later in accordance with the operation clock frequency of the main microcomputer 11.

  The main CPU 111 can be temporarily suspended when no operation is required. For example, when a predetermined command is received by the operation receiving unit 13 or when there is no operation and a predetermined time has elapsed, the entire operation of the main microcomputer 11 is stopped and a transition is made to a sleep mode in which the sub-microcomputer 21 operates. Shall. In the smart watch 100, the main microcomputer 11 is provided with two modes, a sleep mode and an operation mode. A mode in which the main microcomputer 11 and the sub microcomputer 21 operate is referred to as an operation mode.

  The first display unit 12 described above is displayed mainly by the control operation of the main microcomputer 11 (main CPU 111). Here, when the operation of the main microcomputer 11 is stopped, the display is also turned off. The display content may be controlled by the sub microcomputer 21 (sub CPU 211).

  The operation reception unit 13 includes the above-described touch sensor, receives an input operation from the outside (that is, a user), converts the operation content into an electric signal, and outputs the electric signal to the main CPU 111. When the input operation to the touch sensor is performed, when the main CPU 111 is inactive (in a standby state), this electric signal becomes an operation resumption signal, and the operation of the main CPU 111 is resumed.

  The wireless communication controller 14 is a controller for performing wireless communication with an external electronic device (external device). The wireless communication standard is not particularly limited, and examples thereof include short-range wireless communication such as Bluetooth (registered trademark: Bluetooth), wireless LAN (IEEE 802.11), and the like. The main microcomputer 11 (main CPU 111) can acquire necessary information, programs, update data thereof, and the like from the outside via the wireless communication controller 14. Examples of the external device that is a communication connection target include a smartphone, a mobile phone, a tablet terminal, a PDA (Personal Digital Assistant), an external server via an access point, and the like.

  The external storage unit 15 is a nonvolatile large-capacity storage, and stores map data for performing navigation and map display. The external storage unit 15 is not limited to the one built in the smart watch 100, and may be provided with a removable portable small storage medium such as a flash memory.

  The sub microcomputer 21 includes a sub CPU 211, a RAM 212, a storage unit 213, an RTC 214 (real time clock), a buffer memory 215, and the like. The sub-microcomputer 21 receives power supply from the power source via the PMIC 31 and operates. The sub-microcomputer 21 controls the operation of the second display unit 22, the measurement unit 23, and the satellite radio wave reception module 24 and the exchange of data with the main microcomputer 11. The sub-microcomputer 21 consumes power (during normal operation and maximum; mainly based on TDP (thermal design power) of the CPU and the influence of the capacity and number of RAM, etc.) Is a sub-control unit for performing continuously performed operations with relatively low power consumption, which is smaller than the power consumption of the main microcomputer 11 (in normal operation and at the maximum time, respectively).

The sub CPU 211 performs various arithmetic processes and controls the operation of the sub microcomputer 21. The sub CPU 211 may have lower power consumption (TDP or the like) than the main CPU 111, and accordingly, may have lower capacity than the main CPU 111. As long as the power supply from the PMIC 31 is not insufficient, the sub CPU 211 basically maintains the minimum operation. When the minimum operation is periodically performed at a predetermined interval, the operation other than the period of operation at the predetermined interval may be paused (set to a standby state).
The RAM 212 provides a working memory space to the sub CPU 211 and stores temporary data. The RAM 212 retains stored data as long as the power supply from the PMIC 31 is normally performed even when the sub CPU 211 performs the operation intermittently as described above.

  The storage unit 213 is a non-volatile memory such as a flash memory that stores a control program (including various application programs (applications)) executed by the sub CPU 211 and setting data. The programs stored in the storage unit 213 include a time display program executed in the sub-microcomputer 21 and a positioning control program for the satellite radio wave reception module 24.

  The RTC 214 is a normal one that performs a timekeeping operation of date and time (time information). As described above, the RTC 214 has a lower accuracy than the timekeeping operation by the timekeeping unit 114 of the main microcomputer 11, but on the other hand, the timekeeping operation by the timekeeping unit 114. Therefore, the date and time are continuously counted even when the main microcomputer 11 is stopped or the sub-microcomputer 21 is on standby.

  The buffer memory 215 is a volatile memory that temporarily stores the positioning result acquired by the satellite radio wave reception module 24, and a DRAM (Dynamic RAM) or the like is used. The positioning result acquired by the satellite radio wave receiving module 24 is once stored in the buffer memory 215 and output to the main microcomputer 11 at an appropriate timing.

  As described above, the second display unit 22 consumes less power than the first display unit 12 and is used for displaying time during the display operation. When the MIP liquid crystal is used for the display screen, the second display unit 22 can lower the display content update frequency under the control of the sub CPU 211.

  The measurement unit 23 includes a sensor that measures a physical quantity indicating the motion state of the smart watch 100. Here, the measurement unit 23 includes an acceleration sensor, and in addition to this, may include an orientation sensor (geomagnetic field sensor), an atmospheric pressure sensor (used as an altitude sensor), and the like. The measurement unit 23 also includes a tilt sensor that detects a predetermined posture of the smartwatch 100, in this case, the tilted state of the smartwatch 100 when the user lifts his arm in front of the user so that the display screen of the smartwatch 100 is easy to see. You may have.

The satellite radio wave receiving module 24 captures, receives and demodulates radio waves from positioning satellites, here at least radio waves from positioning satellites (GNSS satellites) related to GNSS (Global Navigation Satellite System), and acquires time points and positioning. Module (satellite radio wave reception LSI (Large Scale Integration)). The radio wave from the positioning satellite includes time information measured by the positioning satellite. The satellite radio wave receiving module 24 has an antenna (not shown), and receives radio waves (1.57542 GHz (for example, L1 band of GPS (Global Positioning System) in the GNSS satellite)) based on the control of the sub microcomputer 21 (sub CPU 211). Receives radio waves, performs reverse spectrum spread, and acquires and decodes navigation messages. The satellite radio wave receiving module 24 performs positioning calculation based on the navigation message acquisition and decoding results. The obtained date and current position and current position are output in a predetermined format.
Note that the satellite radio wave receiving module 24 may be configured to receive radio waves from positioning satellites other than the GNSS system to acquire time and perform positioning.

  The satellite radio wave reception module 24 includes a memory 241 and stores temporary data necessary for operation. The memory 241 is a volatile memory such as SRAM (Static RAM). During operation, time information acquisition, execution control program (firmware) necessary for positioning operation, navigation message format information for each positioning satellite, each positioning satellite, etc. Orbit information (ephemeris, almanac) acquired from is stored. The memory 241 can maintain the operation even when the operation of the reception operation unit of the satellite radio wave reception module 24 is stopped, but when the operation of the memory 241 is stopped and restarted, At least a part (firmware or the like) of these is re-acquired from the storage unit 213 of the sub-microcomputer 21. The satellite radio wave receiving module 24 can acquire radio waves from the number of positioning satellites necessary for positioning and acquire ephemeris, respectively, and then perform positioning calculation continuously to obtain the current position.

  The switch 25 is an on switch that accepts a predetermined user operation for restarting the main microcomputer 11 when the main microcomputer 11 is in the sleep mode. The switch 25 may be provided exclusively or may be used in combination with the push button switch B1.

  The notification unit 26 includes an audio output unit, a vibration unit, and the like, and notifies that the current time is an alarm time by outputting an alarm sound and vibration.

  The PMIC 31 controls the power supply to the main microcomputer 11 and the sub-microcomputer 21 using the power supply power input from the external power supply via the external power supply terminal 32 or the power supply power input from the secondary battery 34. The PMIC 31 includes, for example, a switch for determining whether or not power can be output to the main microcomputer 11 and the sub-microcomputer 21, a DC / DC converter that adjusts an output voltage, and the like, and supplies appropriate power when the main microcomputer 11 and the sub-microcomputer 21 operate. Supply to these.

  The external power supply terminal 32 is an input terminal of a connector for an external power supply. The external power source is an AC (Alternative Current) adapter that converts AC from commercial power to DC, or an external device that can supply power to the outside such as a PC (Personal Computer). The connector of the cable connected between the external power supply terminal 32 and the external power supply is, for example, a USB (Universal Serial Bus) type, but is not particularly limited.

  The charging control unit 33 is a circuit unit that controls the charging of the secondary battery 34 by outputting the power source power input from the external power source via the external power source terminal 32 to the secondary battery 34. In particular, the charge control unit 33 executes a first charge control process described later. Further, the charging control unit 33 acquires the battery voltage (terminal voltage) of the secondary battery 34 and the battery current (charging current) to the secondary battery 34. In addition, the charging control unit 33 is connected to the main microcomputer 11 and the sub-microcomputer 21, acquires current time information measured by the clock unit 114 during the operation mode from the main microcomputer 11, and is clocked by the RTC 214 during the sleep mode. Current time information is acquired from the sub-microcomputer 21. In addition, the charging control unit 33 is connected to the temperature measurement unit 35 and acquires temperature information of the secondary battery 34 measured by the temperature measurement unit 35 from the temperature measurement unit 35.

  The charge control unit 33 includes a memory (not shown) such as a semiconductor memory. The memory of the charge control unit 33 stores various data (alarm time, first predetermined time, second predetermined time, threshold value of current value for full charge determination, predetermined amount of decrease in constant voltage, recharge trigger, Is stored).

  The charge control unit 33 will be described as a circuit unit in which the function of the first charge control process is incorporated, but is not limited to this. For example, the charging control unit 33 may be configured as a microcomputer having a storage unit, a RAM, and a CPU in which a program for the first charging control process is stored, and as a part of another microcomputer (for example, the sub microcomputer 21). It may be configured.

  The secondary battery 34 is a secondary battery that can be charged and discharged, such as a lithium ion rechargeable battery. The secondary battery 34 is charged by a charging current as power source power input from the charging control unit 33, and the accumulated power is discharged to the PMIC 31 as an operating current of each part of the smartwatch 100.

  The temperature measurement unit 35 is a temperature sensor, measures the temperature of the secondary battery 34, and outputs the measured temperature to the charge control unit 33 as temperature information.

  Next, with reference to FIGS. 3 to 5, an operation related to charging of the secondary battery 34 in the smart watch 100 will be described. FIG. 3 is a flowchart showing the first charging control process. FIG. 4 is a diagram illustrating a state of charging with respect to an elapsed time when the scheduled time in the first charging control process is long and rapid charging is not performed. Fig.5 (a) is a figure which shows the battery voltage with respect to the elapsed time after the full charge of a 1st charge control process, a battery current, and temperature. FIG.5 (b) is a figure which shows the battery voltage, the battery current, and temperature with respect to the elapsed time after the full charge of the conventional charge.

  With reference to FIG. 3, the 1st charge control process performed by the charge control part 33 is demonstrated. In advance, the main CPU 111 receives an alarm time setting input from the user via the operation reception unit 13, and stores the input alarm time in the memory of the storage unit 113, the storage unit 213, and the charge control unit 33. The alarm time is target date and time information for the user to complete charging (full charge) of the secondary battery 34. For example, when the user completes charging of the smart watch 100 while the user is sleeping at night and uses the smart watch 100 after getting up, the wake-up time is set and input as the alarm time. In addition, during the charging of the secondary battery 34 (during the charging mode), the smart watch 100 is in the operation mode or the sleep mode.

  In the smart watch 100, for example, the charging control unit 33 executes the first charging control process using a trigger of the detection of the voltage of the input power supply when a connector of the external power supply is connected to the external power supply terminal 32. . In addition, for example, the first charge control process is appropriately terminated with a trigger that the connector of the external power supply is disconnected from the external power supply terminal 32 and the voltage of the input power supply is not detected. The smart watch 100 may be configured to mechanically detect that an external power supply connector is connected to or disconnected from the external power supply terminal 32.

  As shown in FIG. 3, first, the charging control unit 33 acquires the current date and time information as the charging start time from the main microcomputer 11 (in operation mode) or the sub-microcomputer 21 (in sleep mode) (step S11). Then, the charge control unit 33 reads and acquires the alarm time from the built-in memory, and acquires the current temperature information of the secondary battery 34 from the temperature measurement unit 35 (step S12).

  Then, the charge control unit 33 calculates the scheduled charge time, the threshold value of the charge amount of the secondary battery 34, and the charge resumption time using the information acquired in steps S11 and S12 (step S13). FIG. 4 shows various times and charging methods according to the elapsed time from the charging start time when the scheduled time in the first charging control process is long and quick charging is not performed. In step S13, as shown in FIG. 4, the charging control unit 33 subtracts the charging start time acquired in step S11 from the alarm time acquired in step S12 to calculate the scheduled charging time.

  The amount of charge of the secondary battery 34 is a value expressed as a percentage from 0% that is not charged to 100% that is fully charged. As shown in FIG. 4, the threshold value of the charge amount is a charge amount smaller than the full charge of the target secondary battery 34 that is charged with a constant current when the scheduled time is long and rapid charging is not performed. The threshold value of the charge amount is set to 70% at room temperature, for example. However, if the temperature of the secondary battery 34 is low, the battery voltage of the secondary battery 34 is a predetermined voltage (for example, CCCV (Constant Current Constant Voltage) charging method) even in constant current charging with the same current amount. The battery voltage of the secondary battery 34 reaches the predetermined voltage later if the temperature is high. The CCCV charging method starts charging the secondary battery with the battery current as a constant current (CC), and when the battery voltage reaches a predetermined constant voltage (CV), the secondary battery is charged with the constant voltage. This is a charging method in which the battery is fully charged. The battery current immediately after the start of charging in the CCCV charging method may be charged as a current value smaller than a constant current.

  For this reason, if the temperature of the secondary battery 34 is lower than the normal temperature, it is preferable to lower the threshold of the charge amount from the threshold at the normal temperature according to the temperature. If the temperature is higher than the normal temperature, the charge is performed according to the temperature. The amount threshold is preferably raised from the room temperature threshold. In this way, in step S13, the charge control unit 33 calculates an appropriate charge amount threshold value from the temperature information acquired in step S12.

  In addition, as shown in FIG. 4, when the scheduled time is long and quick charging is not performed, after charging with a constant current, charging is stopped to prevent deterioration of the secondary battery 34, and the second predetermined time from the alarm time is stopped. Before, charging is resumed by the normal CCCV charging method. The second predetermined time is a time during which the secondary battery 34 can be fully charged from the charge amount threshold value by normal CCCV charging, and is, for example, one hour. In step S13, the charging control unit 33 calculates the second predetermined time from the temperature information acquired in step S12 and the calculated threshold value of the charge amount, and subtracts the second predetermined time from the alarm time acquired in step S12. Calculate the charge resumption time.

  Then, the charging control unit 33 reads the first predetermined time from the built-in memory, and determines whether or not the scheduled time calculated in step S13 is shorter than the first predetermined time (step S14). The first predetermined time is a threshold value indicating whether or not the scheduled time is short enough to require quick charging, and is, for example, one hour.

  When the scheduled time is shorter than the first predetermined time (step S14; YES), the charging control unit 33 uses the power supply power input from the external power supply via the external power supply terminal 32 to perform the secondary battery 34 by the quick charging method. Is charged (step S15). The rapid charging method is, for example, a CCCV charging method, and a constant current value is higher than that of a normal CCCV charging method. Since the current value of the constant current is high, the charging time until the battery voltage becomes a constant voltage is shorter than the normal CCCV charging method, and can be charged quickly. The current value of the constant current in the constant current charging of the quick charge is set to a current value at which charging is completed in a short time such as several tens of minutes, and also varies depending on the battery capacity of the secondary battery 34.

  Then, the charge control unit 33 reads the threshold value of the current value for full charge determination from the built-in memory, refers to the battery current (charge current) of the secondary battery 34, and the battery current of the secondary battery 34 has the current value. It is determined whether or not the battery is fully charged due to the threshold value (step S16). The battery current of the secondary battery 34 is constant in the constant current charging of the CCCV charging method, and continues to decrease after the constant voltage charging is performed. When the battery is not fully charged (step S16; NO), the process proceeds to step S15.

  When the battery is fully charged (step S16; YES), the charging control unit 33 stops charging the secondary battery 34 (step S17). When the scheduled time is equal to or longer than the first predetermined time (step S14; NO), the charging control unit 33 charges the secondary battery 34 with a constant current (step S18). The current value of the constant current in step S18 is, for example, the same as the current value of the constant current of the normal CCCV charging method.

  Then, the charge control unit 33 determines whether or not the charge amount corresponding to the battery voltage of the secondary battery 34 is the threshold value of the charge amount calculated in step S13 (step S19). The amount of charge of the secondary battery 34 in constant current charging increases as the battery voltage increases. When the charge amount is not the threshold value of the charge amount (step S19; NO), the process proceeds to step S18.

  When the charge amount is a threshold value for the charge amount (step S19; YES), the charge control unit 33 stops charging the secondary battery 34 (step S20). Then, the charging control unit 33 acquires current time information from the main microcomputer 11 or the sub-microcomputer 21, and determines whether or not the current time is the charging restart time calculated in step S13 (step S21). If the current time is not the charging resumption time (step S21; NO), the process proceeds to step S21.

  When the current time is the charging resumption time (step S19; YES), the charging control unit 33 charges the secondary battery 34 by a normal CCCV charging method (step S22). Step S23 is the same as step S16. When the battery is not fully charged (step S23; NO), the process proceeds to step S22. When the battery is fully charged (step S23; YES), the process proceeds to step S17, and the charging control unit 33 stops charging the secondary battery 34. As shown in FIG. 4, in steps S18 to S23, constant current charging → charge stop when the charge amount reaches a threshold value → restart charging of the normal CCCV charge method when full time is reached → full charge (charge) Completed) processing is executed in order.

  Then, the charge control unit 33 reads a predetermined amount of decrease in constant voltage from the built-in memory, and sets the constant voltage of the CCCV charging method to decrease by a predetermined amount (step S24). In step S24, for example, the initial constant (the original voltage before the decrease setting) is set to 4.35 [V], and a predetermined amount of the constant voltage decrease is set to 0.1 [V] (100 [mV]) as described later. ), The lowered constant voltage is 4.25 [V] obtained by subtracting a predetermined amount 0.1 [V] from the original constant voltage 4.35 [V]. And the charge control part 33 discriminate | determines whether the charge start event by the load increase of the smartwatch 100 generate | occur | produced (step S25).

  Here, recharging when a charging start event occurs due to an increase in the load of the smartwatch 100 after full charging in steps S17 and S24 to S29 will be described. When charging a lithium-ion rechargeable battery as a secondary battery, if the rechargeable battery is held at a high voltage for a long period of time by continuing to apply the charging voltage without stopping charging even when it is fully charged, the temperature of the battery at that time Although the degree is different, there is a problem that the decomposition of the electrolyte is promoted inside the battery to generate gas, and the swelling and performance deterioration of the battery are accelerated. Therefore, the charging of the lithium ion rechargeable battery is performed by detecting that the battery current has sufficiently decreased in the constant voltage charging process of the CCCV charging method, or by specifying the fully charged state by dividing the time by using a timer or the like. A charging method is recommended in which a high charging voltage is not continuously applied by disconnecting the path from the charging circuit to the rechargeable battery. It is also recommended that recharging after the end of the charging process due to full charge not give a high battery voltage frequently by adding hysteresis to the voltage and restarting the charging with the battery voltage lowered to some extent. Has been.

  However, even if the charging circuit adopts a method that satisfies the recommended processing for charging termination and recharging, if a charging start event occurs frequently due to an external factor, recharging in a fully charged state will result. There is a risk that it is frequently performed and the battery voltage is maintained at a high level. Factors that cause frequent charging start events include the following.

  For example, when a product (equipment) having a secondary battery is operated by USB power supply and is charged with charging current, the current that can be supplied by the corresponding USB port is limited, so that the limit is not exceeded. It is necessary to limit the input current of the charging circuit. If the operating current temporarily exceeds the current limit due to an increase in the load of the product, the supply current from the USB port is limited by the limiting operation, and even if all of it is used as the operating current of the product, Since charging cannot be performed and part of the operating current is supplied from the secondary battery, the charging mode is temporarily shifted to the discharging mode at that time. Next, when the operating current is reduced, the current limitation is released and charging can be performed. Therefore, a charging start event occurs, charging is performed again by shifting to the charging mode. If this charging start event occurs after the end of the charging process due to full charging, recharging is started before the battery voltage decreases, so that if it occurs frequently, the battery voltage is always kept high.

  In step S25, the charging control unit 33 determines whether or not a charging start event has occurred due to the transition from the discharging mode to the charging mode due to the load increase of the smartwatch 100 (for example, the occurrence of wireless communication in the wireless communication controller 14). The determination is made based on a change in the voltage of the power supply system supplied from the USB port.

  When a charging start event due to an increase in load occurs (step S25; YES), the charging control unit 33 determines whether or not the battery voltage of the secondary battery 34 is lower than the constant voltage decreased in step S24 (step S26). ). If the battery voltage is equal to or higher than the reduced constant voltage (step S26; NO), recharging is not performed and the process proceeds to step S25.

  If the battery voltage is lower than the reduced constant voltage (step S26; YES), the charging control unit 33 recharges the secondary battery 34 by the CCCV charging method with the constant voltage reduced in step S24 (step S27). Step S28 is the same processing as steps S16 and S23. When the battery is not fully charged (step S28; NO), the process proceeds to step S27. When the battery is fully charged (step S28; YES), the charging control unit 33 stops recharging the secondary battery 34 (step S29), and proceeds to step S25.

  When a charging start event due to an increase in load has not occurred (step S25; NO), the charging control unit 33 reads the first threshold voltage that triggers recharging from the built-in memory, and the battery voltage of the secondary battery 34. Is lower than the first threshold voltage (step S30). The first threshold voltage is, for example, a voltage (4.05 [V]) obtained by subtracting a predetermined amount (0.2 [V]) from the constant voltage at that time (decrease-set constant voltage 4.25 [V]). It is. However, the present invention is not limited to this, and the first threshold voltage is, for example, a voltage (4.15) obtained by subtracting a predetermined amount (0.2 [V]) from the original constant voltage (4.35 [V]). [V]). Thus, it is assumed that there is a relationship of original constant voltage> decrease set constant voltage> first threshold voltage.

  In step S25, the trigger for recharging due to the occurrence of a charging start event due to an increase in load is determined. In step S30, the secondary battery is passed after a long time (for example, 6 days) after charging is stopped in step S17. The recharge trigger necessary when the charge amount of 34 greatly decreases is determined. When the battery voltage is equal to or higher than the first threshold voltage (step S30; NO), the process proceeds to step S25.

When the battery voltage is lower than the first threshold voltage (step S30; YES), the charge control unit 33 recharges the secondary battery 34 by the constant voltage CCCV charging method reduced in step S24 (step S31). Step S32 is the same processing as steps S16, S23, and S28. When the battery is not fully charged (step S32; NO), the process proceeds to step S31. When the battery is fully charged (step S32; YES), the charging control unit 33 stops recharging the secondary battery 34 (step S33), and proceeds to step S25.
It should be noted that the fully charged battery voltage when the secondary battery 34 is recharged by the CCCV charging method with the constant voltage set to decrease at steps S27 and S31 is the full voltage when the constant voltage is not set to decrease at step S15 and step S22. It becomes lower than the battery voltage for charging.

  Here, with reference to FIG. 5, a specific example of recharging when a charging start event due to load increase occurs will be described. As a specific example showing the effect of recharging the secondary battery of the conventional device, in the secondary battery of the conventional device, after the battery voltage of the secondary battery reaches the fully charged voltage VF1, steps S17 and S25 are performed. It is assumed that the process of S33 has been executed. However, in step S <b> 26, it is assumed that the charge control unit 33 determines whether or not the battery voltage of the secondary battery is lower than a constant voltage that is not set to decrease. In FIG. 5B, the horizontal axis represents elapsed time [minutes], and the vertical axis represents secondary battery battery voltage [V], battery current [mA], and room temperature [° C.]. The battery voltage of the secondary battery is represented by a one-dot chain line, the battery current of the secondary battery is represented by a broken line, and the temperature at room temperature is represented by a solid line.

  As shown in the battery voltage of FIG. 5 (b), even after completion of the constant voltage charging process due to full charge, recharging due to an increase in operating current due to a temporary load increase of the product occurs and frequent pulse charging is performed. Current is generated. In synchronism with this, the battery voltage also rises, the average voltage gradually rises, and it can be seen that a high voltage is continuously applied.

  On the other hand, in order to solve the above problem, the smart watch 100 of the present embodiment starts charging at step S25 by resetting the constant voltage at step S24 at the end of the charging process by full charging. This is a charging method that prevents the battery voltage from rising even if an event occurs and the recharging in step S27 occurs.

  In general, the battery voltage after fully charged in the charging of a lithium ion battery is not continuously applied, and in a released state where there is no load current, the voltage gradually decreases from the constant voltage at the end of charging, and after several hours Settles to a voltage (generally referred to as a relaxed state) reduced by 30-50 [mV]. In battery development, an upper limit that can be used for a constant voltage during charging is determined by designing and evaluating in anticipation of this voltage drop.

  Therefore, the voltage which is reset to a constant voltage at the end of the charging process by full charge in step S24 of the present embodiment is set so as not to exceed the voltage with reference to the voltage reduced by 30 to 50 [mV]. For example, the constant voltage is set to decrease by a predetermined amount 100 [mV] = 0.1 [V]. By doing so, even if a charging start event occurs (step S25; YES) and recharging occurs, the battery voltage can be prevented from rising beyond the lowered voltage.

  FIG. 5A shows a specific example of the present embodiment. In the secondary battery 34 of the smart watch 100, after the battery voltage reaches the fully charged voltage VF0, the processes of steps S17 and S24 to S33 are executed. Shall be. The expression of the battery voltage, the battery current, and the room temperature of the secondary battery 34 in FIG. 5A is the same as that in FIG. Here, it is assumed that the constant voltage of the CCCV charging method before step S17 is set to 4.35 [V], and the constant voltage is set to be lowered to 4.25 [V] in step S24. Then, as shown in FIG. 5A, an increase in operating current due to the occurrence of a charging start event due to a temporary load increase of the smart watch 100 occurs in the same manner as in the measurement of FIG. Since the voltage is equal to or higher than the set constant voltage, step S27 is not executed and the charging current does not flow and the battery voltage is prevented from rising, as is apparent from FIG.

  Further, in the charging mode suspension mode, in parallel with the first charging control process, the sub-microcomputer 21 determines whether or not the current time information measured by the RTC 214 has reached the alarm time stored in the storage unit 213. When the alarm time is reached, the fact that the current time is the alarm time is notified by display of the second display unit 22, sound output of the notification unit 26, and vibration. In the operation mode of the charging mode, in parallel with the first charging control process, the main microcomputer 11 determines whether or not the current time information measured by the timer unit 114 has reached the alarm time stored in the storage unit 113. When the alarm time is reached, the fact that the current time is the alarm time is notified by display of the first display unit 12, sound output of the notification unit 26, and vibration.

  When the charging mode is the sleep mode, the sub-microcomputer 21 determines whether or not the current time is the alarm time. When the current time is the alarm time, the sub-microcomputer 21 activates the main microcomputer 11 to The microcomputer 11 may be configured to notify that the current time is the alarm time by displaying the first display unit 12, outputting sound from the notification unit 26, and vibrating. In this configuration, the notification unit 26 may be connected to the main microcomputer 11.

  As described above, according to the present embodiment, the smart watch 100 acquires the usage state of the smart watch 100 having the secondary battery 34, and charges the secondary battery 34 based on the acquired usage state of the smart watch 100. A charge control unit 33 for controlling the system is provided. For this reason, in the smart watch 100 having the secondary battery 34, the secondary battery 34 can be charged by a charging method appropriate for the user.

  The charging control unit 33 acquires the charging start time for the secondary battery 34, acquires the alarm time set for the alarm, and controls the charging method for the secondary battery 34. The charging control unit 33 controls the charging method for the secondary battery 34 based on the time from the acquired charging start time for the secondary battery 34 to the acquired alarm time. For this reason, the secondary battery 34 can be charged by an appropriate charging method according to the use state of the smartwatch 100 based on the alarm time.

  Moreover, the charge control part 33 charges the secondary battery 34 with a quick charge system, when the time from the charge start time to the acquired secondary battery 34 to the acquired alarm time is shorter than the 1st predetermined time. For this reason, the secondary battery 34 can be rapidly charged by the quick charging method by the alarm time.

  In addition, when the time from the charging start time to the acquired secondary battery 34 to the acquired alarm time is equal to or longer than the first predetermined time, the charging control unit 33 sets the secondary battery 34 in a charging method different from the rapid charging method. Charge. For this reason, the deterioration of the secondary battery 34 can be reduced by a charging method with less battery deterioration than the quick charging method, and the secondary battery 34 can be charged by the alarm time.

  In addition, a charging method different from the quick charging method is a charging method that maintains a charged state with a charge amount smaller than the full charge and then performs a full charge at a predetermined time. When the time from the acquired charging start time to the secondary battery 34 to the acquired alarm time is equal to or longer than the first predetermined time, the charging control unit 33 maintains a charging state with a charging amount smaller than the full charge, and then the predetermined time The secondary battery 34 is charged so as to be fully charged. For this reason, the time of full charge of the secondary battery 34 can be reduced, and deterioration of the secondary battery 34 can be reduced.

  The predetermined time is an alarm time. When the time from the acquired charging start time to the secondary battery 34 to the acquired alarm time is equal to or longer than the first predetermined time, the charging control unit 33 maintains a charging state with a charging amount smaller than the full charge, and then the alarm time The secondary battery 34 is charged so as to be fully charged. For this reason, the time of full charge of the secondary battery 34 can be reduced, deterioration of the secondary battery 34 can be reduced, and the secondary battery 34 can be reliably charged until full charge by the alarm time.

  In addition, when the time from the acquired charging start time to the secondary battery 34 to the acquired alarm time is equal to or longer than the first predetermined time, the charging control unit 33 sets the charging state of the charging amount smaller than the full charge to the first alarm time. 2 The battery is maintained until the charging restart time up to a predetermined time, and then the secondary battery 34 is charged so as to be fully charged at the alarm time. For this reason, the time of full charge of the secondary battery 34 can be reduced, and deterioration of the secondary battery 34 can be reduced effectively.

  Further, the charging control unit 33 charges the secondary battery 34 to a charge amount smaller than the full charge when the time from the acquired charging start time to the secondary battery 34 to the acquired alarm time is equal to or longer than the first predetermined time. Then, the charging is stopped until the time before the second predetermined time before the alarm time, and then the secondary battery 34 is charged so as to be fully charged at the alarm time. For this reason, deterioration of the secondary battery 34 can be more effectively reduced by the charging stop time.

  The alarm time is a wake-up alarm time. For this reason, when the user gets up, the smart watch 100 in which the secondary battery 34 is fully charged can be used.

  Further, when the quick charging method is used and when the scheduled time is equal to or longer than the first predetermined time, the charging control unit 33 charges the secondary battery 34 with a constant current, and the battery voltage of the secondary battery 34 is a predetermined constant voltage. When it becomes, it charges with the said constant voltage until a full charge (CCCV charge system). For this reason, the secondary battery 34 can be appropriately charged until fully charged.

  In addition, the charging control unit 33 sets the constant voltage to be lowered after full charging. For this reason, in the smart watch 100 as a product that is charged and operated simultaneously with an external power supply, even if a temporary operating current of the smart watch 100 exceeds the supply capacity of the external power supply, the battery voltage increases due to recharging. And the deterioration of the battery can be suppressed, so that restrictions on the external power source can be relaxed. Therefore, a product (smartwatch 100) having an operating current exceeding the supply capacity of the external power supply can be realized.

  Moreover, the charge control part 33 stops charge after full charge, and sets a constant voltage to fall. For this reason, the smart watch 100 having an operating current exceeding the supply capability of the external power source can be realized, and the secondary battery 34 can be prevented from being deteriorated by stopping the charging, and the charging power can be saved.

  In addition, the charging control unit 33 sets the secondary battery 34 at a constant current when the battery voltage of the secondary battery 34 becomes a first threshold voltage lower than the set constant voltage after the constant voltage is lowered. Is recharged, and when the battery voltage of the secondary battery 34 reaches a constant voltage set to decrease, the secondary battery 34 is charged with the constant voltage set to decrease to full charge. For this reason, after the charging after the full charge is stopped, when the charge amount of the secondary battery 34 is lowered after a long time, it can be appropriately recharged, and the charge amount of the secondary battery 34 is used for the use of the smartwatch 100. It can be in a preferable state.

(Modification 1)
A first modification of the above embodiment will be described with reference to FIGS. The device configuration of the first modification uses the smart watch 100 as in the above embodiment. However, the charge control unit 33 is configured to execute a second charge control process, which will be described later, instead of the first charge control process.

  Next, with reference to FIG.6 and FIG.7, the operation | movement regarding charge of the secondary battery 34 of the smartwatch 100 is demonstrated. FIG. 6 is a flowchart showing the second charge control process. FIG. 7 is a diagram illustrating a charging state with respect to an elapsed time when the scheduled time in the second charging control process is long and rapid charging is not performed.

  In the smart watch 100, for example, the charging control unit 33 executes the second charging control process with a trigger of the detection of the voltage of the input power supply power connected to the external power supply terminal 32. . Further, for example, the second charge control process is appropriately terminated with a trigger that the connector of the external power supply is disconnected from the external power supply terminal 32 and the voltage of the input power supply is not detected.

  As shown in FIG. 6, steps S41 and S42 are the same as steps S11 and S12 of the first charge control process of FIG. Then, using the information acquired in steps S41 and S42, the charging control unit 33 calculates the scheduled charging time, the threshold value of the charging amount of the secondary battery 34, and the constant current value until the charging method is changed (step S43). . In step S <b> 43, the charging control unit 33 calculates the scheduled charging time and the charge amount threshold value of the secondary battery 34 in the same manner as in the first charging control process.

  FIG. 7 shows various times and charging methods according to the elapsed time from the charging start time when the scheduled time in the second charging control process is long and quick charging is not performed. In the second charging control process, when the scheduled time is long and rapid charging is not performed, constant current charging is performed from the charging start time to the second predetermined time before the alarm time, and then the charging method is normal CCCV charging. Changed to method. The first constant current charging time of the second charging control process is longer than the first constant current charging time of the first charging control process because there is no charge stop.

  For this reason, in step S43, the charging control unit 33 sets the charging amount of the secondary battery 34 as the constant current value until the charging method is changed to the threshold value calculated before the second predetermined time of the alarm time, for example, A current value lower than the constant current value of the normal CCCV charging method is calculated.

  Steps S44 to S47 are the same as steps S14 to S17 in FIG. When the scheduled time is equal to or longer than the first predetermined time (step S44; NO), the charging control unit 33 charges the secondary battery 34 with a constant current having the current value calculated in step S43 (step S48).

  Steps S49, S50, and S51 are the same as steps S19, S22, and S23 of FIG. Steps S52 to S61 are the same as steps S24 to S33 in FIG.

  As described above, according to the first modification, when the time from the acquired charging start time to the secondary battery 34 to the acquired alarm time is equal to or longer than the first predetermined time, the charging control unit 33 sets the second predetermined alarm time. The secondary battery 34 is charged with a constant current until a charge amount smaller than the full charge until the time of changing the charging method up to the time before, and then the secondary battery 34 is charged so as to be fully charged at the alarm time. For this reason, deterioration of the secondary battery 34 can be more effectively reduced by charging with a low constant current.

(Modification 2)
With reference to FIG. 8, the modification 2 of the said embodiment is demonstrated. FIG. 8 is a flowchart showing the third charge control process.

In steps S24 to S33 of the first charge control process of FIG. 3 of the above embodiment and steps S52 to S61 of the second charge control process of FIG. Since the secondary battery 34 is recharged in this manner, the fully charged battery voltage is lower than the fully charged battery voltage when the constant voltage is not set to be lowered.
In the second modification, instead of steps S24 to S33 in FIG. 3 and steps S52 to S61 in FIG. 6, the third steps S71 to S82 in FIG. The fully charged battery voltage is set to the fully charged battery voltage when the constant voltage is not lowered.

  Here, with reference to FIG. 8, a third charging control process will be described as an operation related to the charging of the secondary battery 34 of the smart watch 100. It is assumed that the second threshold voltage is stored in advance in the built-in memory of the charging control unit 33 in addition to the first threshold voltage. In the second modification, the first threshold voltage is, for example, an initial (original) constant voltage (4.35 [V]) − a predetermined value (0.2 [V]) (4.15 [V]). V]). The second threshold voltage is a voltage value lower than the original constant voltage and higher than the lower set constant voltage, for example, 4.27 [V]. That is, the original constant voltage (4.35 [V])> second threshold voltage (4.27 [V])> decreased constant voltage (4.25 [V])> first threshold voltage (4 .15 [V]).

  In the smart watch 100, for example, the charging control unit 33 executes the third charging control process by using, as a trigger, an external power supply connector connected to the external power supply terminal 32 and detecting the input power supply voltage. . Further, for example, the third charge control process is appropriately terminated with a trigger that the connector of the external power supply is disconnected from the external power supply terminal 32 and the voltage of the input power supply is not detected.

  As shown in FIG. 8, in the third charge control process, the steps after the start are the same as steps S11 to S17 in FIG. 3 or steps S41 to S47 in FIG. Step S71 is the same as step S24 of FIG.

  Then, the charging control unit 33 reads the second threshold voltage that triggers recharging from the built-in memory, and determines whether or not the battery voltage of the secondary battery 34 is lower than the second threshold voltage (step S72). ). When the battery voltage of the secondary battery 34 is lower than the second threshold voltage (step S72; YES), the charge control unit 33 returns the constant voltage reduced by a predetermined amount in step S71 to the original constant voltage (step S72). S73). After step S73 or when the battery voltage of the secondary battery 34 is equal to or higher than the second threshold voltage (step S72; NO), the process proceeds to step S74. Step S74 is the same as step S25 of FIG.

  When a charging start event occurs due to an increase in load (step S74; YES), the charging control unit 33 determines whether the battery voltage of the secondary battery 34 is currently set to a constant voltage (a constant voltage set to be lowered in step S71 or step S73). It is determined whether or not it is lower than the original constant voltage returned in step S75). When the battery voltage is equal to or higher than the set constant voltage (step S75; NO), recharging is not performed and the process proceeds to step S72.

  When the battery voltage is lower than the constant voltage being set (step S75; YES), the charging control unit 33 recharges the secondary battery 34 by the CCCV charging method of the constant voltage being set (step S76). Steps S77 and S78 are the same as steps S28 and S29 in FIG. After step S78, the process proceeds to step S71.

  When the charging start event due to the load increase has not occurred (step S74; NO), the process proceeds to step S79. Steps S79 to S82 are the same as steps S30 to S33 in FIG. When the battery voltage is equal to or higher than the first threshold voltage (step S79; NO), the process proceeds to step S72. After step S82, the process proceeds to step S71.

  In the third charging control process, after the secondary battery 34 is fully charged and the charging is stopped in step S17 or S47, the constant voltage is once set to decrease, and the battery voltage of the secondary battery 34 becomes the second threshold as time passes. When the voltage drops, the constant voltage is set to the original constant voltage. In this way, the fully charged battery voltage when the secondary battery 34 is recharged in the original constant voltage CCCV charging method in step S80 is the full charge in steps S15 and S22 (or steps S45 and S50). It becomes the same as the battery voltage.

  As described above, according to the second modification, after the charging control unit 33 sets the constant voltage to be lower, the second battery voltage of the secondary battery 34 is higher than the first threshold voltage lower than the lower set constant voltage. When the threshold voltage is reached, the lowered constant voltage is returned to the original constant voltage. For this reason, after the first full charge, the battery voltage of the secondary battery 34 can be returned to the original constant voltage before the battery voltage drops to the first threshold voltage over time.

  In addition, the charging control unit 33 returns the constant voltage set to be lower to the original constant voltage and then turns the secondary battery 34 at a constant current when the battery voltage of the secondary battery 34 becomes the first threshold voltage. When the battery voltage of the secondary battery 34 becomes the original constant voltage after recharging, the secondary battery 34 is charged with the original constant voltage until full charge. For this reason, the secondary battery 34 whose battery voltage has decreased over time can be recharged to the original constant voltage, and a secondary battery 34 with a large charge can be obtained.

  The second threshold voltage is lower than the original constant voltage and higher than the lower set constant voltage. For this reason, after the first full charge, the battery voltage of the secondary battery 34 can be reliably returned to the original constant voltage before the battery voltage drops to the set constant voltage.

  Note that the descriptions in the above-described embodiments and modifications are examples of the charge control device, the charge control method, and the program according to the present invention, and the present invention is not limited thereto.

  For example, in the above embodiment, when the scheduled time is equal to or longer than the first predetermined time in step S18 of the first charge control process, the secondary battery 34 is determined until the charge amount of the secondary battery 34 reaches the threshold value. Although the current charging is configured, the present invention is not limited to this. For example, in step S18, the secondary battery 34 may be charged by the CCCV charging method. However, the charge amount of the secondary battery 34 is based on the battery voltage at the time of constant current charge, and based on the time of constant voltage charge at the time of constant voltage charge.

  Moreover, in the said embodiment and modification, although the smart watch 100 as an apparatus was set as the structure which has the charge control part 33, it is not limited to this. For example, the external power supply of the smart watch 100 such as an AC adapter or an external device may have a charge control unit similar to the charge control unit 33. The charge control unit of the external power source has the same function as the charge control unit 33, communicates with the main microcomputer 11 and the sub-microcomputer 21 in the smart watch 100, and controls the charge of the secondary battery 34.

  Further, the device having the rechargeable battery (secondary battery 34) is not limited to the smart watch 100. The device having a rechargeable battery may be another device such as a smartphone, a feature phone, a tablet PC, a palmtop PC, or a handy terminal.

  Of course, the detailed configuration and detailed operation of each component of the smart watch 100 in the above-described embodiments and modifications can be appropriately changed without departing from the spirit of the present invention.

Although the embodiments and modifications of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments and modifications, and the scope of the invention described in the claims and equivalents thereof are described. Includes range.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
Use state acquisition means for acquiring a use state of a device having a rechargeable battery;
Charge control means for controlling a charging method for the rechargeable battery based on the use state of the device acquired by the use state acquisition means;
A charge control device comprising:
<Claim 2>
The use state acquisition means includes
First time acquisition means for acquiring a charging start time for the rechargeable battery;
Second time acquisition means for acquiring an alarm time set in the alarm of the device,
The charging control unit charges the rechargeable battery based on a time from a charging start time acquired to the rechargeable battery acquired by the first time acquiring unit to an alarm time acquired by the second time acquiring unit. Control the method,
The charge control device according to claim 1, wherein
<Claim 3>
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is shorter than a first predetermined time, Charging the rechargeable battery with a charging method of 1,
The charge control device according to claim 2, wherein
<Claim 4>
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Charging the rechargeable battery in a second charging method;
The charge control device according to claim 3, wherein
<Claim 5>
The first charging method is a quick charging method,
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is shorter than the first predetermined time, the charge control unit, Charging the rechargeable battery in the rapid charging method;
The charge control device according to claim 3 or 4, wherein
<Claim 6>
The second charging method is a charging method that maintains a charging state with a charging amount smaller than a full charge and then fully charges at a predetermined time,
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Maintaining a charged state of a charge amount smaller than a full charge, and then charging the rechargeable battery so as to be fully charged at a predetermined time;
The charge control apparatus according to claim 4, wherein
<Claim 7>
The predetermined time is the alarm time;
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Maintaining a charged state of a charge amount smaller than a full charge, and then charging the rechargeable battery so as to be fully charged at the alarm time,
The charge control apparatus according to claim 6.
<Claim 8>
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Maintaining a state of charge of a charge amount smaller than a full charge until a time until a second predetermined time before the alarm time, and then charging the rechargeable battery so as to be fully charged at the alarm time;
The charge control device according to claim 7, wherein
<Claim 9>
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is The rechargeable battery is charged to a charge amount smaller than a full charge, the charge is stopped until a second predetermined time before the alarm time, and then the rechargeable battery is charged so as to be fully charged at the alarm time. ,
The charge control apparatus according to claim 8.
<Claim 10>
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Charging the rechargeable battery with a constant current to a charge amount smaller than a full charge until a time up to a second predetermined time before the alarm time, and then charging the rechargeable battery to be fully charged at the alarm time;
The charge control apparatus according to claim 8.
<Claim 11>
The alarm time is a wake-up alarm time,
The charge control device according to claim 2, wherein the charge control device is a charge control device.
<Claim 12>
The charging control unit charges the rechargeable battery with a constant current, and when the battery voltage of the rechargeable battery reaches a predetermined constant voltage, charges the rechargeable battery with the constant voltage until full charge.
The charge control device according to claim 1, wherein the charge control device is a charge control device.
<Claim 13>
The charge control means sets the constant voltage to lower after full charge.
The charge control device according to claim 12, wherein
<Claim 14>
The charge control means stops charging after full charge and sets the constant voltage to a lower level.
The charging control apparatus according to claim 13.
<Claim 15>
The charging control means sets the rechargeable battery at the constant current when the battery voltage of the rechargeable battery becomes a first threshold voltage lower than the constant voltage set to decrease after the constant voltage is set to decrease. When recharging and when the battery voltage of the rechargeable battery reaches the constant voltage set to decrease, the rechargeable battery is charged with the constant voltage set to decrease until full charge.
The charge control device according to claim 13 or 14, characterized in that:
<Claim 16>
The charge control means, after setting the constant voltage to lower, when the battery voltage of the rechargeable battery becomes a second threshold voltage higher than the first threshold voltage lower than the lower set constant voltage, The lowered constant voltage is returned to the constant voltage.
The charge control device according to claim 13 or 14, characterized in that:
<Claim 17>
The charge control means recharges the rechargeable battery with the constant current when the battery voltage of the rechargeable battery reaches a first threshold voltage after returning the lowered constant voltage to the constant voltage. When the battery voltage of the rechargeable battery becomes the constant voltage, the rechargeable battery is charged with the constant voltage until full charge.
The charge control device according to claim 16.
<Claim 18>
18. The charge control device according to claim 16, wherein the second threshold voltage is lower than the constant voltage and higher than the lowered set constant voltage.
<Claim 19>
A usage state acquisition step of acquiring a usage state of a device having a rechargeable battery;
Based on the use state of the device acquired by the use state acquisition step, a charge control step for controlling a charging method for the rechargeable battery;
The charge control method characterized by including.
<Claim 20>
Computer
A usage state acquisition means for acquiring a usage state of a device having a rechargeable battery;
Charge control means for controlling a charging method for the rechargeable battery based on the use state of the device acquired by the use state acquisition means;
A program characterized by functioning as

DESCRIPTION OF SYMBOLS 1 Main part 2 Band 3 Frame 4, 12a, 22a Display screen B1 Pushbutton switch 100 Smart watch 11 Main microcomputer 111 Main CPU
112 RAM
113 Storage Unit 114 Timekeeping Unit 12 First Display Unit 13 Operation Accepting Unit 14 Wireless Communication Controller 15 External Storage Unit 21 Sub-microcomputer 211 Sub-CPU
212 RAM
213 Storage unit 214 RTC
215 Buffer memory 22 Second display unit 23 Measurement unit 24 Satellite radio wave reception module 241 Memory 25 Switch 26 Notification unit 31 PMIC
32 External power supply terminal 33 Charge control unit 34 Secondary battery 35 Temperature measurement unit

Claims (20)

Use state acquisition means for acquiring a use state of a device having a rechargeable battery;
Charge control means for controlling a charging method for the rechargeable battery based on the use state of the device acquired by the use state acquisition means;
A charge control device comprising: The use state acquisition means includes
First time acquisition means for acquiring a charging start time for the rechargeable battery;
Second time acquisition means for acquiring an alarm time set in the alarm of the device,
The charging control unit charges the rechargeable battery based on a time from a charging start time acquired to the rechargeable battery acquired by the first time acquiring unit to an alarm time acquired by the second time acquiring unit. Control the method,
The charge control device according to claim 1, wherein When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is shorter than a first predetermined time, Charging the rechargeable battery with a charging method of 1,
The charge control device according to claim 2, wherein When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Charging the rechargeable battery in a second charging method;
The charge control device according to claim 3, wherein The first charging method is a quick charging method,
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is shorter than the first predetermined time, the charge control unit, Charging the rechargeable battery in the rapid charging method;
The charge control device according to claim 3 or 4, wherein The second charging method is a charging method that maintains a charging state with a charging amount smaller than a full charge and then fully charges at a predetermined time,
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Maintaining a charged state of a charge amount smaller than a full charge, and then charging the rechargeable battery so as to be fully charged at a predetermined time;
The charge control apparatus according to claim 4, wherein The predetermined time is the alarm time;
When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Maintaining a charged state of a charge amount smaller than a full charge, and then charging the rechargeable battery so as to be fully charged at the alarm time,
The charge control apparatus according to claim 6. When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Maintaining a state of charge of a charge amount smaller than a full charge until a time until a second predetermined time before the alarm time, and then charging the rechargeable battery so as to be fully charged at the alarm time;
The charge control device according to claim 7, wherein When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is The rechargeable battery is charged to a charge amount smaller than a full charge, the charge is stopped until a second predetermined time before the alarm time, and then the rechargeable battery is charged so as to be fully charged at the alarm time. ,
The charge control apparatus according to claim 8. When the time from the charging start time to the rechargeable battery acquired by the first time acquisition unit to the alarm time acquired by the second time acquisition unit is equal to or longer than the first predetermined time, the charge control unit is Charging the rechargeable battery with a constant current to a charge amount smaller than a full charge until a time up to a second predetermined time before the alarm time, and then charging the rechargeable battery to be fully charged at the alarm time;
The charge control apparatus according to claim 8. The alarm time is a wake-up alarm time,
The charge control device according to claim 2, wherein the charge control device is a charge control device. The charging control unit charges the rechargeable battery with a constant current, and when the battery voltage of the rechargeable battery reaches a predetermined constant voltage, charges the rechargeable battery with the constant voltage until full charge.
The charge control device according to claim 1, wherein the charge control device is a charge control device. The charge control means sets the constant voltage to lower after full charge.
The charge control device according to claim 12, wherein The charge control means stops charging after full charge and sets the constant voltage to a lower level.
The charging control apparatus according to claim 13. The charging control means sets the rechargeable battery at the constant current when the battery voltage of the rechargeable battery becomes a first threshold voltage lower than the constant voltage set to decrease after the constant voltage is set to decrease. When recharging and when the battery voltage of the rechargeable battery reaches the constant voltage set to decrease, the rechargeable battery is charged with the constant voltage set to decrease until full charge.
The charge control device according to claim 13 or 14, characterized in that: The charge control means, after setting the constant voltage to lower, when the battery voltage of the rechargeable battery becomes a second threshold voltage higher than the first threshold voltage lower than the lower set constant voltage, The lowered constant voltage is returned to the constant voltage.
The charge control device according to claim 13 or 14, characterized in that: The charge control means recharges the rechargeable battery with the constant current when the battery voltage of the rechargeable battery reaches a first threshold voltage after returning the lowered constant voltage to the constant voltage. When the battery voltage of the rechargeable battery becomes the constant voltage, the rechargeable battery is charged with the constant voltage until full charge.
The charge control device according to claim 16.   18. The charge control device according to claim 16, wherein the second threshold voltage is lower than the constant voltage and higher than the lowered set constant voltage. A usage state acquisition step of acquiring a usage state of a device having a rechargeable battery;
Based on the use state of the device acquired by the use state acquisition step, a charge control step for controlling a charging method for the rechargeable battery;
The charge control method characterized by including. Computer
A usage state acquisition means for acquiring a usage state of a device having a rechargeable battery;
Charge control means for controlling a charging method for the rechargeable battery based on the use state of the device acquired by the use state acquisition means;
A program characterized by functioning as

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