JP2013115862A - Charging device, electric device, and coulomb counter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the state of a battery charger to charge the battery charger.SOLUTION: In an electric device 1, a controller 101 detects a charging current, a voltage of a battery 50, and a time period elapsed from the charging start during charging of the battery 50 and determines whether the battery 50 is normal or abnormal utilizing detected values and reference data. When the controller 101 determines that the battery 50 is normal, the controller 101 continues charging of the battery 50. Meanwhile, the controller 101 determines that the battery is abnormal, the controller 101 stops the charging of the battery 50.

Description

  The present invention relates to a charging device, an electric device, and a coulomb counter, and in particular, a charging device for charging a rechargeable battery, an electric device equipped with such a charging device, and a communication device that can communicate with such a charging device. Concerning the coulomb counter.

  Conventionally, various techniques have been proposed for determining the end of charging of a rechargeable battery. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-254055) discloses a timer control in a final constant current control for charging a rechargeable battery used for a vehicle such as a forklift after a constant current control and a constant voltage control. Thus, a technique for simplifying control related to charging is disclosed.

JP 2009-254055 A

  Here, the technique disclosed in Patent Document 1 targets a rechargeable battery that is unlikely to be repeatedly used during charging, such as a forklift. In addition, when a battery is repeatedly used even during charging, such as when a charging place is incorporated in a home appliance or a portable terminal, the battery is fully charged when the technology described in Patent Document 1 is applied. It is assumed that charging is stopped by the timer without reaching.

  While the power consumption increases due to the increase in screen size and multifunction as in recent mobile terminals, the user more reliably completes charging until full charge and uses the mobile terminal without charging for a longer time. There is a request. Moreover, there is such a demand not only for portable terminals but also for household appliances such as a TV and a vacuum cleaner that can be used in a cordless manner, and also for electric vehicles that are already in practical use.

  The present invention has been conceived in view of such circumstances, and an object of the present invention is to provide a charging device, an electric device, and a coulomb counter capable of more accurately detecting the state of a rechargeable battery and performing a charging process. It is.

  A charging device according to the present invention is a charging device for charging a secondary battery, and includes a control unit for supplying power to the secondary battery for charging the secondary battery, and a secondary by the control unit. A time measuring means for measuring a time from when charging of the battery is started; a first detecting means for detecting a charging current in charging of the secondary battery; and a first detecting means for detecting the voltage of the secondary battery. The second detection means, the third detection means for detecting the temperature of the secondary battery, and the information about the relationship between the charging time, the charging current, the voltage and the temperature of the secondary battery in the charging of the secondary battery are stored. Storage means, and the control means during the charging of the secondary battery, the time measured by the time measuring means, the charging current detected by the first detection means, and the second current detected by the second detection means The voltage of the secondary battery and the temperature detected by the third detection means are stored in the storage means. Based on whether the stored relationship to determine whether to continue the charging of the secondary battery.

  Preferably, the apparatus further includes fourth detection means for detecting the amount of electricity charged in the secondary battery, and the control means completes charging of the secondary battery based on the amount of electricity detected by the fourth detection means. Determine whether or not.

  Preferably, the control means uses the voltage of the secondary battery detected by the second detection means based on the information associating the voltage value of the secondary battery with the remaining capacity characteristic, and the remaining charge of the secondary battery. Calculate time.

  Preferably, the control unit terminates the power supply to the secondary battery on the condition that a specific time has elapsed after starting the power supply for charging the secondary battery.

  Preferably, the control unit corrects at least one of the charging current detected by the first detection unit and the voltage detected by the second detection unit based on the temperature detected by the third detection unit.

  Preferably, the control means calculates the remaining capacity of the secondary battery based on the voltage detected by the second detection means, and is provided on the condition that the remaining capacity is equal to or less than a specific capacity. Start feeding.

  Preferably, the control unit starts power feeding to the secondary battery on condition that the remaining capacity of the secondary battery continues for a certain time and becomes equal to or less than a specific capacity.

  Preferably, the storage means stores the relationship for each number of times the secondary battery is charged, and the control means stores the secondary battery based on the relationship stored in the storage means corresponding to the number of secondary batteries. Whether to continue charging is determined.

  An electric device according to the present invention includes the above-described charging device and an operation unit that realizes a predetermined function by being supplied with power from a secondary battery charged in the charging device.

  The coulomb counter according to the present invention is a coulomb counter capable of communicating with a charging device for charging a secondary battery. The charging device includes a control unit for supplying power to the secondary battery for charging the secondary battery, and a time measuring unit for measuring a time from when charging of the secondary battery is started by the control unit; Is provided. The coulomb counter includes first detection means for detecting a charging current in charging the secondary battery, and second detection means for detecting the voltage of the secondary battery. The charging device also includes third detection means for detecting the temperature of the secondary battery, and information on the relationship between the charging time, the charging current, the voltage and the temperature of the secondary battery in charging the secondary battery. Storage means for storing. And the control means of the charging device includes the time measured by the time measuring means, the charging current detected by the first detecting means, and the voltage of the secondary battery detected by the second detecting means during charging of the secondary battery. And determining whether or not to continue charging the secondary battery based on whether or not the temperature detected by the third detection means is in a relationship stored in the storage means.

  Preferably, the coulomb counter further includes fourth detection means for detecting the amount of electricity charged in the secondary battery. And the control means of a charging device judges whether charge of a secondary battery was completed based on the electric quantity which the 4th detection means detected.

  According to the present invention, when charging the secondary battery, the secondary battery is charged based on whether the relationship between the charging current and the voltage of the secondary battery is a suitable relationship according to the charging time. It is determined whether or not to continue.

  Thereby, charging can be stopped when the internal impedance of the secondary battery is increased due to repeated charging or the like.

It is a figure which shows typically the whole structure of the electric equipment which is one Embodiment of the electric equipment of this invention. It is a figure which shows typically the electric constitution of the part which comprises a charging device in the electric equipment of FIG. It is a figure which shows typically the example of the data utilized in the electric equipment of FIG. 2 is a flowchart of processing executed when charging a battery in the electric device of FIG. 1. It is a figure which shows the modification of the charging device shown by FIG. It is a figure which shows the other modification of the charging device shown by FIG. It is a figure for demonstrating the modification of the process shown by the flowchart of FIG. It is a figure for demonstrating the modification of the whole structure of the electric equipment of FIG.

  Hereinafter, embodiments of an electric apparatus according to the present invention will be described with reference to the drawings. In the following description, elements having the same function and action are denoted by the same reference numerals, and redundant description will not be repeated.

<Schematic configuration of electrical equipment>
FIG. 1 is a diagram schematically showing an overall configuration of an electrical device that is an embodiment of the electrical device of the present invention.

  Referring to FIG. 1, electric device 1 includes a battery (secondary battery) 50 for charging. In the electrical device 1, the battery 50 is charged by receiving power from the external power supply 90.

  In addition, the electric device 1 includes an AC (Alternating Current) adapter 70 that converts electric power supplied from the external power supply 90 into electric power for charging the battery 50, and a PMIC (Power Management) that controls supply of electric power to the battery 50. Integrated Circuit) 100, FGIC (Fuel Gauge Integrated Circuit) 300 for measuring the voltage of the battery 50, the temperature sensor 20 for detecting the temperature in the vicinity of the battery 50, and the essential functions of the electric device 1 And an internal system 60 for exerting. The internal system 60 is supplied with power from the battery 50.

  As an essential function of the electric device 1, for example, if the electric device 1 is a telephone, a call function is included. In this case, the internal system 60 includes a microphone and a speaker for inputting and outputting audio, an audio input circuit and an audio output circuit, and a circuit for communication for transmitting and receiving audio. In addition, when the telephone has a function of data transmission / reception for mail transmission / reception, web browsing, etc., the internal system 60 converts a communication circuit and data conversion for transmitting / receiving such data. Including a circuit (software and an arithmetic circuit for realizing the software).

  If the electric device 1 is a vacuum cleaner, the above-described essential function includes a function of sucking dust. In this case, the internal system 60 includes a motor for realizing the function and a circuit for controlling supply of electric power to the motor.

  If the electrical device 1 is a television, it includes a function for displaying video. In this case, the internal system 60 outputs a circuit for receiving the video, a circuit for displaying the video (a circuit for controlling the operation of the display device), and audio received along with the video. Including a circuit for

  If the electric device 1 is an electric vehicle, it includes a traveling function. In this case, the internal system 60 includes a motor for rotating the wheels and a circuit for controlling the supply of electric power to the motor.

  In the electrical device 1, power from the external power supply 90 is supplied to the internal system 60 and the battery 50 via the PMIC 100. The PMIC 100 controls the current (load current) supplied to the internal system 60 and the current (charge current) supplied to the battery 50.

The PMIC 100 measures the charging current of the battery 50 and the discharging current (current supplied from the battery 50 to the internal system 60). The PMIC 100 and the FGIC 300 communicate with each other by I ² C (Inter-Integrated Circuit).

  The FGIC 300 measures the voltage of the battery 50 and the discharge current based on the voltage applied between the resistor 40 provided between the battery 50 and ground (ground). In addition, the FGIC 300 functions as a coulomb counter that acquires the charging current of the battery 50 from the PMIC 100 and calculates the amount of electricity charged in the battery 50 based on the charging current and the discharging current.

  In the electric device 1, a part for controlling the charging of the battery 50 is called a charging device. Specifically, in the electric device 1, a portion other than the internal system 60 and the battery 50 in the electric device 1 includes a charging device.

<Configuration of charging device>
FIG. 2 is a diagram schematically showing an electrical configuration of a portion constituting the charging device in the electrical apparatus 1.

Referring to FIG. 2, in electrical device 1, PMIC 100 and FGIC 300 include I ² C interfaces 103 and 303 for I ² C communication, respectively.

  The PMIC 100 also includes a controller 101 for controlling various operations such as charging of the battery 50. The controller 101 includes a calculation device such as a CPU (Central Processing Unit) and a storage device that stores a program executed by the calculation device. The controller 101 implements the functions described in the present specification, for example, when the arithmetic device executes the program. The storage device may be configured to be detachable from the main body of the PMIC 100.

  PMIC 100 also includes a charge control unit 110 for adjusting the load current and / or the charging current. Further, the PMIC 100 includes a timer 104 having a timekeeping function.

  The FGIC 300 includes a controller 301 for controlling various operations such as communication with the PMIC 100. The controller 301 includes an arithmetic device such as a CPU and a storage device that stores a program executed by the arithmetic device. The controller 301 implements the functions described in the present specification, for example, when the arithmetic device executes the program. Note that the storage device may be configured to be detachable from the main body of the FGIC 300.

  The FGIC 300 also includes a voltage detection unit 312 that measures the voltage of the battery 50 as described above.

  As described above, the controller 301 calculates the amount of electricity charged in the battery 50 based on the charging current and discharging current detected by the PMIC 100. Then, the controller 301 stores the amount of electricity in the storage device of the controller 301 and transmits it to the PMIC 100. The controller 301 may directly transmit the amount of electricity to the PMIC 100 without storing it in the storage device.

  In step S40, which will be described later, the controller 101 calculates the amount of electricity charged in the battery 50 from the start of charging by calculating the integrated amount of the amount of electricity stored in the FGIC 300 from the start of charging.

<Reference data>
In the present embodiment, the controller 101 detects the charging current, the voltage of the battery 50, and the time from the start of charging during charging of the battery 50, and uses these detected values and reference data. Then, it is determined whether the battery 50 is normal or abnormal. If it is determined to be normal, charging of the battery 50 is continued. On the other hand, if it is determined that there is an abnormality, charging of the battery 50 is stopped.

  FIGS. 3A to 3C are diagrams schematically illustrating an example of reference data for determining whether the battery 50 is normal or abnormal.

  The data shown in FIG. 3 (A) to FIG. 3 (C) are the charging current (current value) for each of a plurality of temperature ranges of t1 to t2 ° C., t2 to t3 ° C., t3 to t4 ° C. It includes one or more combinations for each range of voltage (voltage value) and time from the start of charging (charging time). 3A shows the data for t1 to t2 ° C., FIG. 3B shows the data for t2 to t3 ° C., and FIG. 3C shows the data for t3 to t4 ° C.

  In the data in each temperature range in FIGS. 3A to 3C, combinations of current value, voltage value, and charging time are arranged for each row. For example, in the data about the temperature range from t1 to t2 ° C. (FIG. 3A), the current value range (At11 to At12), the voltage value range (Vt11 to Vt12), and the charging time range (Tt11 to Tt12). Constitute one combination.

  Note that in this embodiment, the reference data may be information that can specify a combination of a current value, a voltage value, and a charging time for each temperature range, and is shown in FIGS. 3 (A) to 3 (C). It is not limited to the tabular form as listed. For example, when a current value is detected at a certain temperature, the reference data includes a voltage value (or a range of voltage values) and a charge corresponding to the detected current value at the temperature and the charging time at that time. Data of a function that can specify time (or a range of charging time) may be used. In the present embodiment, data about three types of temperature ranges is described as shown in FIGS. 3A to 3C. However, the types of temperature ranges included in the reference data are described. Is not limited to three types.

<Charge control process>
FIG. 4 is a flowchart of processing (control processing) executed when the battery 50 is charged in the PMIC 100.

  With reference to FIG. 4, the controller 101 executes step S <b> 10 at a timing such as when the AC adapter 70 is connected to the external power supply 90. In step S <b> 10, the controller 101 starts charging the battery 50. Specifically, the controller 101 starts supplying power supplied from the external power supply 90 to the battery 50.

  Next, in step S20, the controller 101 acquires the temperature detected by the temperature sensor 20, the charging current of the battery 50, and the voltage of the battery 50, and proceeds to step S30. In step S <b> 20, the controller 101 acquires the voltage value of the battery 50 from the FGIC 300.

  In step S30, the controller 101 determines that the battery 50 is normal based on the data acquired in step S20 and the reference data as described with reference to FIGS. 3 (A) to 3 (C). Determine whether or not. Specifically, for example, first, the temperature range to which the detected temperature of the temperature sensor 20 acquired in step S20 belongs from a plurality of temperature ranges as shown in FIGS. (For example, which of FIGS. 3A to 3C is specified). Then, in the data of the temperature range, the range of the charging time including the elapsed time from the start of charging in step S10 is specified. The current value acquired in step S20 belongs to the current value range corresponding to the range of the charging time specified as described above, and the voltage value acquired in step S20 is specified as described above. When it belongs to the voltage value range corresponding to the charging time range, it is determined that the battery 50 is normal. On the other hand, if it is determined that at least one of the current value and the voltage value does not belong to the range, it is determined that the battery 50 is abnormal.

  In step S30, the controller 101 proceeds to step S40 when determining that the battery 50 is normal, and proceeds to step S70 when determining that the battery 50 is abnormal. Note that the controller 101 also proceeds to step S70 when the temperature detected by the temperature sensor 20 acquired in step S20 does not belong to the temperature range stored in the reference data.

  In step S70, the controller 101 stops the charging of the battery 50, notifies the end of the charging of the battery 50, and ends the process. The stop of charging is to stop the supply of power from the external power source 90 to the battery 50. The notification is, for example, lighting of a predetermined lamp provided in the above-described charging device or an instruction to display a message to the internal system 60 that the charging of the battery 50 has ended abnormally. In step S70, at least the charging of the battery 50 may be stopped, and the notification operation may be omitted.

  In step S40, the controller 101 determines whether or not the battery 50 has been charged. This determination is made, for example, by calculating the amount of electricity charged from the start of charging in step S10 as described above. Specifically, if the amount of electricity has reached a predetermined amount of electricity for the battery 50 (hereinafter referred to as “end amount of electricity”), it is determined that charging has been completed, and the amount of electricity is still determined in advance. If the amount of electricity has not been reached, it is determined that charging has not been completed. Controller 101 proceeds to step S50 when determining that charging is complete, and proceeds to step S60 when determining that charging is not yet completed.

  In step S50, the controller 101 ends charging of the battery 50 by supplying power to the battery 50, and ends the process shown in FIG.

  In step S60, the controller 101 calculates and displays the remaining charge time, and returns the process to step S20. For example, if the PMIC 100 does not include a display device, the controller 101 may instruct the internal system 60 to display the remaining time. For example, the controller 101 calculates an amount of electricity (hereinafter referred to as “difference amount of electricity”) obtained as a difference between the above-described amount of electricity and the amount of electricity charged in the battery 50 from the start of charging acquired in step S40. The difference electric quantity is calculated by calculating the time required to charge the difference electric quantity with the charging current acquired in the latest step S20 and the voltage value of the battery 50.

  The controller 101 can also calculate the remaining time based on the voltage-remaining capacity characteristic of the battery 50 using the maximum electric capacity of the battery 50 and the voltage value acquired in step S20. . Specifically, the controller 101 obtains a difference between the maximum electric capacity and the remaining capacity corresponding to the voltage value acquired in step S20 in the above characteristics, and uses the difference capacity as the charging current acquired in step S20. The remaining time is calculated by calculating the time required for charging with the voltage value of the battery 50.

  The maximum electric capacity and voltage-remaining capacity characteristics of the battery 50 may be stored in advance in the storage device of the controller 101, for example. Alternatively, the storage device stores the maximum electric capacity and voltage-remaining capacity characteristics of a plurality of types of secondary batteries, and the controller 101 acquires the type of the battery 50 attached to the electric device 1. Thus, the maximum electric capacity and voltage-remaining capacity characteristics corresponding to the acquired type used for calculating the remaining time may be selected. The controller 101 acquires the type of the attached battery 50, for example, by accepting input of information from the outside, or by reading information recorded on the attached battery 50 (the surface thereof). .

  Moreover, in the electric device 1, the controller 101 or the controller 301 corrects the charging current and / or voltage of the battery 50 acquired in step S20 according to the environment (for example, the temperature detected by the temperature sensor 20). Also good. The controller 101 or the controller 301 stores, for example, a means (for example, a correction value or a correction function) for correction associated with the temperature in the storage device, and uses the means to calculate the charging current and / or voltage. to correct. Note that the controller 101 performs correction after obtaining the charging current and voltage from the FGIC 300 in step S20 and before the determination in step S30. In addition, the controller 301 performs correction after acquiring the charging current and voltage and before transmitting to the PMIC 100.

  In the charge control process described above with reference to FIG. 4, the time from the start of charging, the charging current, and the voltage of the battery 50 are specified in the reference data while the secondary battery (battery 50) is being charged. Whether or not to continue charging the battery 50 is determined based on the result of the determination of whether or not there is a relationship (step S30). If it is determined that the relationship is not specified, charging of the battery 50 is stopped (step S70). On the other hand, if it is determined that the relationship is specified in the reference data, the charging is continued until the charged amount of electricity reaches the “end amount of electricity”. Specifically, the processes of step S20 to step S60 are repeated.

  Here, in the electrical device 1, the controller 101 may start the above-described charging control process on the condition that the AC adapter 70 is connected to the external power supply 90.

  In addition, after the charging control process is finished, when the connection between the AC adapter 70 and the external power supply 90 is continued, the controller 101 periodically acquires the voltage value of the battery 50 in the same manner as in step S20. The charge control process may be resumed on the condition that the remaining capacity corresponding to the voltage value thus obtained in the voltage-remaining capacity characteristic is equal to or less than a specific capacity. Thereby, in the electric equipment 1, even when the remaining capacity of the battery 50 is reduced due to the discharge, the charging of the battery 50 can be appropriately started.

  When starting the charge control process based on the value of the remaining capacity of the battery 50, the controller 101 performs the charge control on the condition that the remaining capacity of the battery 50 continuously becomes equal to or less than the specific capacity for a certain time. Processing may be started. Thereby, it is possible to avoid the start of the charge control process due to a temporary and unnatural increase / decrease in the remaining capacity of the battery 50 due to a voltage value detection error of the battery 50 or the like.

  Moreover, in the said charge control process, the process of step S20-step S60 is repeated for every predetermined time. Specifically, the current value acquired in step S20 is, for example, the charging current at the predetermined time (the integrated value of the charges sent from the external power supply 90 to the battery 50 at the predetermined time). Moreover, the voltage value acquired in step S20 is a voltage value detected at a certain time in the predetermined time. Note that it may be an average value of voltage values detected at a plurality of time points included in the predetermined time.

  Moreover, in this Embodiment, the electric equipment 1 may be comprised integrally with the internal system 60, the battery 50, and the charging device, and as shown in FIG. The part may be configured separately. That is, as shown in FIG. 5, the battery 50 may be configured to be detachable from the electric device 1A and replaceable to the electric device 1A.

  The charging device may also be configured separately from the internal system 60 as shown in FIG. In FIG. 6, the charging device 1 </ b> B may be configured as a device for charging the battery 50 and independently of the internal system 60. In this case, the charging device 1 </ b> B may be traded independently of the internal system 60. The battery 50 is charged by the charging device 1 </ b> B, then is detached from the charging device 1 </ b> B, is attached to the internal system 60, and supplies power to the internal system 60.

  In addition, as shown in FIG. 7, electric device 1 according to the present embodiment is configured to forcibly end charging based on the elapse of a specific time after starting charging in step S <b> 10. May be. In the process shown in FIG. 7, the controller 101 determines that charging is not completed in step S <b> 40 and then starts charging in step S <b> 10 by referring to the time measured by the timer 104 in step S <b> 41. It is determined whether or not a specific time has passed. If the controller 101 determines that the specific time has elapsed, the controller 101 ends the charging in step S50. On the other hand, when determining that it has not yet elapsed, the controller 101 advances the process to step S60. As a result, in the electric device 1, it is reliably avoided that power is supplied to the battery 50 for charging for a specific time or longer. The specific value of the specific time may be changed according to the type of secondary battery used as the battery 50.

  In the charging control process, as described with reference to FIGS. 3A to 3C, the determination of whether the battery 50 is normal or abnormal is set for each temperature range. The determination was made based on a reference value for a combination of current value, voltage value, and charging time. Such a reference value may be set for each number of times the battery 50 is charged. In addition, as a tendency of the reference value for the same charging time in the same temperature range, the current value tends to decrease as the number of times of charging increases, and the voltage value tends to increase as the number of times of charging increases. In this case, every time charging is started in step S10, the controller 101 updates the count value of the counter that counts the number of times of charging by one. In step S30, the controller 101 determines whether or not the battery 50 is normal by using the reference value as described with reference to FIG. 3 for the number of times of charging corresponding to the count value in the counter. To do. Thereby, when the number of times the battery 50 is charged increases and the battery 50 is assumed to be deteriorated, it is possible to determine whether the battery 50 is normal or abnormal according to the reference value corresponding to the deteriorated battery 50.

  Moreover, in the electric equipment 1 of this Embodiment, as FIG. 8 shows, FGIC300 is comprised with respect to the electric equipment 1 (charging device) so that attachment or detachment is possible, and it may be made into the object of a transaction independently. .

  Each embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1, 1A electrical equipment, 1B charging device, 20 temperature sensor, 40 resistance, 50 battery, 60 internal system, 70 AC adapter, 90 external power supply, 100 PMIC, 101, 301 controller, 103, 303 I ² C interface, 104 timer 110 charge control unit, 300 FGIC, 312 voltage detection unit.

Claims (11)

A charging device for charging a secondary battery,
Control means for supplying power to the secondary battery for charging the secondary battery;
Time measuring means for measuring the time from when charging of the secondary battery is started by the control means;
First detecting means for detecting a charging current in charging the secondary battery;
Second detection means for detecting a voltage of the secondary battery;
Third detection means for detecting the temperature of the secondary battery;
In the charging of the secondary battery, comprising a storage means for storing information about the relationship between the charging time, the charging current, the voltage and temperature of the secondary battery,
The control means includes a time measured by the time measuring means during charging of the secondary battery, a charging current detected by the first detection means, and the secondary battery detected by the second detection means. Charging that determines whether or not to continue charging the secondary battery based on whether or not the voltage and the temperature detected by the third detection means are in the relationship stored in the storage means. apparatus. Further comprising a fourth detection means for detecting the amount of electricity charged in the secondary battery,
2. The charging device according to claim 1, wherein the control unit determines whether or not charging of the secondary battery is completed based on an amount of electricity detected by the fourth detection unit.   The control means uses the voltage of the secondary battery detected by the second detection means based on information associating a voltage value and a remaining capacity characteristic of the secondary battery to charge the secondary battery. The charging device according to claim 1, wherein the remaining time is calculated.   The control unit according to claim 1, wherein the control unit terminates the power supply to the secondary battery on the condition that a specific time has elapsed since the start of power supply for charging the secondary battery. The charging apparatus in any one.   The control means corrects at least one of a charging current detected by the first detection means and a voltage detected by the second detection means based on the temperature detected by the third detection means. The charging device according to any one of claims 1 to 4.   The control means calculates the remaining capacity of the secondary battery based on the voltage detected by the second detection means, and is provided to the secondary battery on the condition that the remaining capacity is equal to or less than a specific capacity. The charging device in any one of Claims 1-5 which starts electric power feeding.   The control unit according to claim 6, wherein power supply to the secondary battery is started on a condition that a remaining capacity of the secondary battery is continuously equal to or less than the specific capacity for a predetermined time. Charging device. The storage means stores the relationship for each number of times of charging the secondary battery,
The control unit determines whether or not to continue charging the secondary battery based on the relationship stored in the storage unit corresponding to the number of times of the secondary battery. Item 8. The charging device according to any one of Items 7. The charging device according to any one of claims 1 to 8,
An electric device comprising: an operation unit that realizes a predetermined function by being supplied with electric power from a secondary battery charged in the charging device. A coulomb counter capable of communicating with a charging device for charging a secondary battery,
The charging device is:
Control means for supplying power to the secondary battery for charging the secondary battery;
A time measuring means for measuring a time from when charging of the secondary battery is started by the control means,
The coulomb counter is
First detecting means for detecting a charging current in charging the secondary battery;
Second detection means for detecting the voltage of the secondary battery,
The charging device is:
Third detection means for detecting the temperature of the secondary battery;
In the charging of the secondary battery, further comprising storage means for storing information on the relationship between the charging time, the charging current, the voltage and temperature of the secondary battery,
The control means of the charging device includes the time measured by the time measuring means, the charging current detected by the first detecting means, and the second detecting means detected during the charging of the secondary battery. It is determined whether or not to continue charging the secondary battery based on whether or not the voltage of the secondary battery and the temperature detected by the third detection means are in a relationship stored in the storage means. A coulomb counter. Further comprising a fourth detection means for detecting the amount of electricity charged in the secondary battery,
11. The coulomb counter according to claim 10, wherein the control unit of the charging device determines whether or not charging of the secondary battery is completed based on an amount of electricity detected by the fourth detection unit.

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