WO2021010622A1 - Dispositif électronique comprenant une batterie et son procédé de commande de charge de batterie - Google Patents

Dispositif électronique comprenant une batterie et son procédé de commande de charge de batterie Download PDF

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Publication number
WO2021010622A1
WO2021010622A1 PCT/KR2020/008549 KR2020008549W WO2021010622A1 WO 2021010622 A1 WO2021010622 A1 WO 2021010622A1 KR 2020008549 W KR2020008549 W KR 2020008549W WO 2021010622 A1 WO2021010622 A1 WO 2021010622A1
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WIPO (PCT)
Prior art keywords
battery
value
voltage
electronic device
current value
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PCT/KR2020/008549
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English (en)
Korean (ko)
Inventor
배찬중
임경우
Original Assignee
삼성전자 주식회사
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Publication of WO2021010622A1 publication Critical patent/WO2021010622A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage

Definitions

  • Various embodiments disclosed in this document relate to an electronic device including a battery and a method for controlling charging of the battery thereof.
  • Portable electronic devices that can be used while moving, such as mobile communication terminals, personal digital assistants (PDAs), electronic notebooks, smart phones, tablet PCs, and smart watches, have been released.
  • Portable electronic devices generally use batteries for portability.
  • the battery has a characteristic that the internal resistance (IR) of the battery increases as the battery is used for a long time, and the increase of the internal resistance of the battery is accelerated according to the influence of temperature and current.
  • IR internal resistance
  • the electronic device does not use a separate fuel gauge, it may not be possible to check accurate battery status information.
  • Electronic devices may include a battery, a printed circuit board, a memory, and a processor.
  • the processor may periodically check the current value of the battery, and in response to the checked current value of the battery being equal to or greater than a first threshold value, the processor may periodically check the current value and the voltage value of the battery Stored in a memory, and in response to a decrease in the checked current value of the battery to less than a second threshold value, a first current value and a first voltage value of the stored current value and voltage value of the stored battery are determined, and
  • the voltage value of the battery which is checked after a predetermined time elapses from when the current value decreases below the second threshold value, is determined as a second voltage value, and the first voltage value, the second voltage value, and the first Based on the current value, it may be configured to control the charging voltage and charging current of the battery.
  • the battery charging control method of an electronic device includes an operation of periodically checking a current value of a battery, and in response to a current value of the checked battery being equal to or greater than a first threshold, the current value of the battery And periodically checking and storing a voltage value, in response to a decrease in the checked current value of the battery below a second threshold value, a first current value and a first voltage value of the stored battery current value and voltage value.
  • the charging voltage and charging current of the battery may be controlled based on the second voltage value and the first current value.
  • Electronic devices may include a battery, a printed circuit board, a memory, and a processor.
  • the processor checks the voltage value of the battery and measures a first voltage value and a first current value of the battery in response to a decrease in the checked voltage value of the battery below a specified threshold value.
  • the voltage value of the battery is determined as a second voltage value, stored in the memory, and checked after a predetermined time has elapsed from when the voltage value of the checked battery has decreased below the specified threshold value, and the first voltage value , Based on the second voltage value and the first current value, it may be configured to control the charging voltage and the charging current of the battery.
  • the electronic device may slow the aging rate of the battery by calculating the internal resistance of the battery and controlling the battery charging voltage and the charging current.
  • the electronic device may more accurately determine the aging state of the battery by measuring the voltage change amount of the battery and calculating the internal resistance of the battery.
  • the electronic device may slow the aging rate of the battery by measuring the voltage change amount of the battery and controlling the battery charging voltage and the charging current.
  • FIG. 1 is a block diagram of an electronic device in a network environment according to various embodiments of the present disclosure.
  • 2A is a graph of the internal resistance R of the battery according to the number of use cycles of the battery.
  • 2B is a graph of a battery supplyable capacity and battery internal resistance according to the number of times of use of the battery.
  • 3A is a block diagram of an electronic device according to various embodiments of the present disclosure.
  • 3B is a block diagram of an electronic device according to various embodiments of the present disclosure.
  • FIG. 3C is a diagram illustrating changes in voltage (V bat ) and current (I bat ) of a battery over time when a load of a specific level is applied and released to an electronic device having different number of uses. It is a graph.
  • FIG. 4 is a flowchart illustrating an operation of an electronic device according to various embodiments of the present disclosure.
  • FIG. 5 is a flowchart illustrating an operation of an electronic device according to various embodiments of the present disclosure.
  • FIG. 1 is a block diagram of an electronic device 101 in a network environment 100 according to various embodiments.
  • the electronic device 101 communicates with the electronic device 102 through a first network 198 (for example, a short-range wireless communication network), or a second network 199 It is possible to communicate with the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network).
  • the electronic device 101 may communicate with the electronic device 104 through the server 108.
  • the electronic device 101 includes a processor 120, a memory 130, an input device 150, an audio output device 155, a display device 160, an audio module 170, and a sensor module ( 176, interface 177, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196, or antenna module 197 ) Can be included.
  • a sensor module 176, interface 177, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196, or antenna module 197
  • at least one of these components may be omitted or one or more other components may be added to the electronic device 101.
  • some of these components may be implemented as one integrated circuit.
  • the sensor module 176 eg, a fingerprint sensor, an iris sensor, or an illuminance sensor
  • the display device 160 eg, a display.
  • the processor 120 for example, executes software (eg, a program 140) to implement at least one other component (eg, a hardware or software component) of the electronic device 101 connected to the processor 120. It can be controlled and can perform various data processing or operations. According to an embodiment, as at least part of data processing or operation, the processor 120 may store commands or data received from other components (eg, the sensor module 176 or the communication module 190) to the volatile memory 132. The command or data stored in the volatile memory 132 may be processed, and result data may be stored in the nonvolatile memory 134.
  • software eg, a program 140
  • the processor 120 may store commands or data received from other components (eg, the sensor module 176 or the communication module 190) to the volatile memory 132.
  • the command or data stored in the volatile memory 132 may be processed, and result data may be stored in the nonvolatile memory 134.
  • the processor 120 includes a main processor 121 (eg, a central processing unit or an application processor), and a secondary processor 123 (eg, a graphic processing unit, an image signal processor) that can be operated independently or together , A sensor hub processor, or a communication processor). Additionally or alternatively, the coprocessor 123 may be set to use lower power than the main processor 121 or to be specialized for a designated function. The secondary processor 123 may be implemented separately from the main processor 121 or as a part thereof.
  • the coprocessor 123 is, for example, on behalf of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 is active (eg, an application is executed). ) While in the state, together with the main processor 121, at least one of the components of the electronic device 101 (for example, the display device 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the functions or states related to. According to an embodiment, the coprocessor 123 (eg, an image signal processor or a communication processor) may be implemented as part of another functionally related component (eg, the camera module 180 or the communication module 190). have.
  • an image signal processor or a communication processor may be implemented as part of another functionally related component (eg, the camera module 180 or the communication module 190). have.
  • the memory 130 may store various data used by at least one component of the electronic device 101 (eg, the processor 120 or the sensor module 176).
  • the data may include, for example, software (eg, the program 140) and input data or output data for commands related thereto.
  • the memory 130 may include a volatile memory 132 or a nonvolatile memory 134.
  • the program 140 may be stored as software in the memory 130, and may include, for example, an operating system 142, middleware 144, or an application 146.
  • the input device 150 may receive a command or data to be used for a component of the electronic device 101 (eg, the processor 120) from an outside (eg, a user) of the electronic device 101.
  • the input device 150 may include, for example, a microphone, a mouse, a keyboard, or a digital pen (eg, a stylus pen).
  • the sound output device 155 may output an sound signal to the outside of the electronic device 101.
  • the sound output device 155 may include, for example, a speaker or a receiver.
  • the speaker can be used for general purposes such as multimedia playback or recording playback, and the receiver can be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.
  • the display device 160 may visually provide information to the outside of the electronic device 101 (eg, a user).
  • the display device 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device.
  • the display device 160 may include a touch circuitry set to sense a touch, or a sensor circuit (eg, a pressure sensor) set to measure the strength of a force generated by the touch. have.
  • the audio module 170 may convert sound into an electric signal or, conversely, convert an electric signal into sound. According to an embodiment, the audio module 170 acquires sound through the input device 150, the sound output device 155, or an external electronic device (for example, an external electronic device directly or wirelessly connected to the electronic device 101). Sound may be output through the electronic device 102 (for example, a speaker or headphones).
  • the sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101, or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the detected state. can do.
  • the sensor module 176 may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.
  • the interface 177 may support one or more designated protocols that may be used for the electronic device 101 to connect directly or wirelessly with an external electronic device (eg, the electronic device 102 ).
  • the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.
  • HDMI high definition multimedia interface
  • USB universal serial bus
  • SD card interface Secure Digital Card
  • the connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to an external electronic device (eg, the electronic device 102 ).
  • the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).
  • the haptic module 179 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that a user can perceive through a tactile or motor sense.
  • the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.
  • the camera module 180 may capture a still image and a video.
  • the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.
  • the power management module 188 may manage power supplied to the electronic device 101.
  • the power management module 188 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).
  • PMIC power management integrated circuit
  • the battery 189 may supply power to at least one component of the electronic device 101.
  • the battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.
  • the communication module 190 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, electronic device 102, electronic device 104, or server 108). It is possible to support establishment and communication through the established communication channel.
  • the communication module 190 operates independently of the processor 120 (eg, an application processor), and may include one or more communication processors that support direct (eg, wired) communication or wireless communication.
  • the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg : A LAN (local area network) communication module, or a power line communication module) may be included.
  • a corresponding communication module is a first network 198 (for example, a short-range communication network such as Bluetooth, WiFi direct or IrDA (infrared data association)) or a second network 199 (for example, a cellular network, the Internet, or It can communicate with external electronic devices through a computer network (for example, a telecommunication network such as a LAN or WAN).
  • the wireless communication module 192 uses subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 in a communication network such as the first network 198 or the second network 199.
  • subscriber information e.g., International Mobile Subscriber Identifier (IMSI)
  • IMSI International Mobile Subscriber Identifier
  • the antenna module 197 may transmit a signal or power to the outside (eg, an external electronic device) or receive from the outside.
  • the antenna module 197 may include one antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern.
  • the antenna module 197 may include a plurality of antennas. In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is, for example, provided by the communication module 190 from the plurality of antennas. Can be chosen.
  • the signal or power may be transmitted or received between the communication module 190 and an external electronic device through the at least one selected antenna.
  • other components eg, RFIC
  • other than the radiator may be additionally formed as part of the antenna module 197.
  • At least some of the components are connected to each other through a communication method (e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI))) between peripheral devices and signals ( E.g. commands or data) can be exchanged with each other.
  • a communication method e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)
  • GPIO general purpose input and output
  • SPI serial peripheral interface
  • MIPI mobile industry processor interface
  • commands or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199.
  • Each of the external electronic devices 102 and 104 may be a device of the same or different type as the electronic device 101.
  • all or part of the operations executed by the electronic device 101 may be executed by one or more of the external electronic devices 102, 104, or 108.
  • the electronic device 101 needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device 101 does not execute the function or service by itself.
  • One or more external electronic devices receiving the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit the execution result to the electronic device 101.
  • the electronic device 101 may process the result as it is or additionally and provide it as at least a part of a response to the request.
  • cloud computing, distributed computing, or client-server computing technology may be used.
  • 2A is a graph of the internal resistance R of the battery according to the number of use cycles of the battery.
  • the number of times the battery is used may mean, for example, the number of times the battery is charged and discharged.
  • G101, g102, and g103 shown in FIG. 2A denote different types of batteries, and it can be seen that the internal resistance of the battery increases as the number of times of use of the battery increases, regardless of the type of battery in general.
  • the internal resistance of the battery may increase.
  • unexpected voltage fluctuations may occur, and unnecessary power consumption may increase.
  • the internal resistance of the battery is, for example, a value related to energy that can be accumulated in the battery according to the aging state of the battery.When the same power is consumed/accumulated in the battery, the voltage value change amount and the current value are measured It may be a value obtained by dividing the voltage change amount by the measured current value.
  • 2B is a graph of a battery supplyable capacity g201 and a battery internal resistance g202 according to the number of times the battery is used.
  • the supplyable capacity of the battery tends to decrease as the number of times of use of the battery increases.
  • the supplyable capacity of the battery may be, for example, an amount of current that the battery can constantly supply.
  • the supplyable capacity of the battery may be a value obtained by multiplying a supply current value of the battery by an outputable time.
  • 3A and 3B are block diagrams of an electronic device according to various embodiments of the present disclosure.
  • an electronic device 101 may include a battery management system 310, a battery 320, and a printed circuit board (eg, a PCB) (not shown).
  • the electronic device 101 may further include a battery protection control device 330, a battery protection operation device 340, or a fuel gauge 350 (fuel gauge IC).
  • the electronic device 101 may further include a memory (not shown).
  • the configurations shown in FIG. 3A may be formed on a printed circuit board.
  • Various embodiments disclosed in this document may be configured by omitting, replacing or combining some of the configurations illustrated in FIG. 3A.
  • the electronic device 101 includes a processor 311, an input/output interface 313, a battery charging device 315, a battery discharging device 317, a battery 320, a fuel gauge 350, and a battery protection device.
  • the control device 330 or the battery protection operation device 340 may be included.
  • the processor 311 is a configuration capable of performing an operation or data processing related to control and/or communication of each component of the electronic device 101.
  • the processor 311 may be operatively connected to, for example, components of the electronic device 101.
  • the processor 311 may load commands or data received from other components of the electronic device 101 into a memory, process commands or data stored in the memory, and store result data.
  • the input/output interface 313 may be a component capable of transmitting and receiving power or data through connection of an external power device or data device.
  • the battery charging device 315 may control charging of the battery 320 with the received power.
  • the battery charging device 315 may receive, for example, a setting value for controlling charging of the battery 320 from the processor 311, and control charging of the battery 320 based on the setting value. have.
  • the set value for controlling the charging of the battery 320 may include, for example, a charging voltage, a charging current, a full charging voltage, and a value regarding a full determination current.
  • the battery charging device 315 includes the type of external power (eg, a power adapter, USB or wireless charging), the amount of power that can be supplied from the external power source (eg, about 20 watts or more), or a battery ( A charging method (eg, normal charging or rapid charging) may be selected based on at least some of the attributes of 320), and the battery 320 may be charged using the selected charging method.
  • the external power supply is wired to the electronic device 101, for example, through a connection terminal (for example, the connection terminal 178 in FIG. 1), or through an antenna module (for example, the antenna module 197 in FIG. 1). Can be connected wirelessly.
  • the battery discharging device 317 may include various devices for discharging the battery 320 due to a load.
  • the battery discharging device 317 may include, for example, a display (eg, the display device 160 in FIG. 1 ), a power conversion device that generates an external output, and may include all power consuming devices necessary for system maintenance. I can.
  • the battery charging device 315 and the battery discharging device 317 may be implemented as one component.
  • the battery 320 may supply power required to operate each component of the electronic device 101.
  • the battery protection control apparatus 330 may be configured to determine whether to perform a protection operation by determining a state of the battery 320.
  • the battery protection control device 330 may determine whether the battery 320 is protected based on, for example, voltage, current, or temperature information of the battery 320.
  • the battery protection operation device 340 may be a component that serves to disconnect power from the battery 320 under control of the protection control device of the battery 320.
  • the battery protection operation device 340 may use, for example, a field effect transistor (FET) device.
  • FET field effect transistor
  • the battery protection operation device 340 may perform one or more of various functions (eg, a pre-blocking function) for preventing performance degradation or burnout of the battery 320.
  • the battery protection operation device 340 may include, for example, a battery 320 protection circuit module (PCN).
  • PCN battery 320 protection circuit module
  • a battery management system 310 capable of performing various functions including cell balancing, capacity measurement of the battery 320, charge/discharge frequency measurement, temperature measurement, or voltage measurement. ) (battery management system (BMS)).
  • BMS battery management system
  • the fuel gauge 350 may monitor state information of the battery 320 to check the state of charge (SOC) of the battery 320 and determine the aging state of the battery 320. have.
  • the fuel gauge 350 may measure usage state information (eg, capacity of the battery 320, the number of times of charging and discharging, voltage, or temperature) of the battery 320. Information determined through the fuel gauge 350 may be transmitted to the processor 311 in the battery management system 310.
  • the fuel gauge 350 may continuously track the state of charge (SOC) of the battery 320 by using an algorithm that accumulates the input/output current of the battery 320.
  • SOC state of charge
  • the processor 311 may control charging and discharging of the battery 320 based on information on the battery 320 received from the fuel gauge 350.
  • 3B is a block diagram of an electronic device 101 according to various embodiments disclosed in this document.
  • 3B is a block diagram of an electronic device 101 that does not include a fuel gauge 350. Descriptions of contents overlapping with those disclosed in FIG. 3A will be omitted.
  • an electronic device 101 may include a battery management system 310, a battery 320, and a printed circuit board (eg, a PCB) (not shown).
  • the electronic device 101 may further include a battery protection control device 330 and a battery protection operation device 340.
  • the electronic device 101 may further include a memory (not shown).
  • the configurations shown in FIG. 3B may be formed on a printed circuit board.
  • the various embodiments disclosed in this document may be configured by omitting, replacing, or combining some of the configurations illustrated in FIG. 3B.
  • the processor 311 may measure the voltage and current of the battery 320.
  • the processor 311 may check the amount of voltage change of the battery 320 and calculate the internal resistance of the battery 320.
  • the processor 311 may calculate the internal resistance of the battery 320 by checking the amount of change in the voltage of the battery 320 according to, for example, a change in load.
  • the processor 311 may check a current value of the battery 320 (eg, an output current of the battery 320 or an input current of the battery 320) (I bat ). For example, the processor 311 may check the current value of the battery 320 through the battery protection control device 330. The processor 311 may check the current value of the battery 320 periodically or continuously, for example.
  • the processor 311 may periodically check and store a current value and a voltage value of the battery 320 when the checked current value of the battery 320 is greater than or equal to the first threshold value.
  • the processor 311 for example, when it is confirmed that the current value of the battery 320 has increased beyond the first threshold value, a load of a specific level is applied, and power of a certain level or more from the battery 320 It can be judged as being supplied.
  • the processor 311 may periodically check and store the current value of the battery 320 in response to the checked current value of the battery 320 being equal to or greater than the first threshold value, and periodically check the voltage value of the battery 320 You can save it.
  • the processor 311 may periodically check the current value and the voltage value of the battery 320 through the battery protection control device 330 and may store the periodically checked current value and the voltage value of the battery 320 in a memory.
  • the first threshold value (eg, 5A) may be variously set according to the characteristics of the battery management system 310 of the electronic device 101.
  • the processor 311 responds to a decrease in the checked current value of the battery 320 below the second threshold value, the first current value and the first voltage among the stored current values and voltage values of the battery 320. Value can be determined.
  • the processor 311 for example, after confirming that the current value of the battery 320 is equal to or greater than the first threshold value, and then confirms that the current value of the battery 320 has decreased below the second threshold value, the electronic device 101 ) May be determined to have entered the idle state. Since the processor 311 periodically checks and stores the current and voltage values of the battery 320, the current value of the battery 320 is less than the second threshold among the stored current and voltage values of the battery 320.
  • the current value and the voltage value of the battery 320 stored immediately before the decrease to may be determined as the first current value and the first voltage value.
  • the second threshold value (eg, 10mA to 500uA) may be variously set according to the characteristics of the battery management system 310 of the electronic device 101. According to various embodiments, the greater the difference between the first threshold value and the second threshold value, the more accurate internal resistance of the battery 320 may be calculated.
  • Processor 311 to determine the voltage value of the battery 320 after a predetermined time has elapsed from the time the current value of the checked battery 320 decreases below the second threshold value as a second voltage value. You can decide.
  • the processor 311 may start the timer when the checked current value of the battery 320 decreases below the second threshold value.
  • the processor 311 may determine whether a predetermined time (eg, 5 minutes) has elapsed from when the current value of the battery 320 checked through the timer decreases below the second threshold value.
  • the processor 311 may check the voltage value of the battery 320 and may determine the determined voltage value of the battery 320 as the second voltage value.
  • the predetermined time may be, for example, a pause time sufficient to determine that the voltage value of the battery 320 has reached close to the voltage value measured in the state where no OC load is applied, the open circuit voltage value. have.
  • the processor 311 may check the voltage value of the battery 320.
  • the processor 311 may control the battery 320 to stop supplying power to the outside when the voltage value of the checked battery 320 decreases below a specified threshold value.
  • the current value of the battery 320 may decrease to less than the second threshold value (eg, a current off state).
  • the processor 311 measures and stores the first voltage value and the first current value of the battery 320 in response to a decrease in the checked voltage value of the battery 320 below a specified threshold value.
  • the processor 311 is, for example, a current value and a voltage value of the battery 320 stored immediately before the current value of the battery 320 decreases below a second threshold value by stopping supply of external power to the battery 320 May be determined as a first current value and a first voltage value.
  • the processor 311 may determine the voltage value of the battery that is checked as the second voltage value after a predetermined time has elapsed from the time when the voltage value of the checked battery 320 decreases below the specified threshold value.
  • the processor 311 may control the charging voltage and charging current of the battery 320 based on the first voltage value, the second voltage value, and the first current value.
  • V bat voltage of the battery 320 and the current of the battery 320 according to time when a load of a specific level is applied and released to the electronic device 101 having different number of uses.
  • I bat is a graph showing the change.
  • the time t 0 means the time when the applied load is released.
  • g311 (V bat _CY 100 ) and g313 (I bat _CY 100 ) are the voltage change amount g311 of the battery 320 of the electronic device 101 in which the number of uses (the number of charge/discharge) is one
  • the current change amount (g313) of (320) is shown.
  • g321 (V bat _CY 100 ) and g323 (I bat _CY 100 ) are the voltage change amount (g321) of the battery 320 of the electronic device 101 and the current change amount of the battery 320 in which the number of uses (the number of charge/discharge) is 100 represents (g323).
  • g331 (V bat _CY 200 ) and g333 (I bat _CY 200 ) are the voltage change amount (g331) of the battery 320 of the electronic device 101 and the current change amount of the battery 320 in which the number of uses (the number of charge/discharge) is 200 (g333) is shown.
  • g341 (V bat _CY 300 ) and g343 (I bat _CY 300 ) are the voltage change amount (g341) of the battery 320 of the electronic device 101 and the current change amount of the battery 320 in which the number of uses (the number of charge/discharge) is 300 (g343) is shown.
  • the current value of the battery 320 may substantially decrease to a level close to zero (eg, 10 mA).
  • the processor 311 may determine that the electronic device 101 has entered the idle state. It can be seen that the current value of the battery 320 decreases below the second threshold value when the applied load is released regardless of the number of uses.
  • the voltage value of the battery 320 when the load applied to the electronic device 101 is released is measured by measuring an open circuit voltage (OCV) measured in a state in which no load is applied. can do.
  • OCV open circuit voltage
  • the amount of change in which the voltage value of the battery 320 returns to OCV may be affected by the internal resistance of the battery 320.
  • when a load applied to the electronic device 101 changes eg, when a resistance value of the load decreases
  • the voltage value of the battery 320 may increase.
  • the amount of change in the voltage value of the battery 320 may be affected by the internal resistance of the battery 320.
  • the internal resistance value of the battery 320 may be the smallest and the OCV values are different. It may be the smallest compared to (the voltage value may hardly occur.) As the number of times of use of the battery 320 increases (100 times -> 200 times -> 300 times), the internal resistance value of the battery 320 may increase. Referring to graphs g311, g321, g331, and g341, the OCV value may increase as the number of times the battery 320 is used increases. Therefore, the internal resistance of the battery 320 can be calculated using the above characteristics.
  • the processor 311 includes an internal resistance R of the battery 320 based on the determined first voltage value V bat1 , the second voltage value V bat2 , and the first current value I bat1 . cycle ) can be calculated.
  • the processor 311 may calculate the internal resistance of the battery 320 using, for example, Equation 1 below.
  • the processor 311 responds to a decrease in the current value of the battery 320 below the second threshold value.
  • the first voltage value and the first current value may be determined.
  • the processor 311 may determine I bat1, which is the current value immediately before the decrease, as the first current value.
  • the processor 311 since the processor 311 periodically checks and stores the current value of the battery 320, the current value of the battery 320 among the stored current values of the battery 320 is less than the second threshold value. I bat1, which is the current value of the battery 320 stored immediately before decreasing to, may be determined as the first current value.
  • the processor 311 may determine, as the first voltage value, V bat1, which is a voltage value when the checked current value decreases below the second threshold value (t 0 ). According to various embodiments, since the processor 311 periodically checks and stores the voltage value of the battery 320, the current value of the battery 320 among the stored voltage values of the battery 320 is less than the second threshold value. V bat1, which is the voltage value of the battery 320 stored immediately before the decrease to, may be determined as the first voltage value.
  • the processor 311 may check the voltage value of the battery 320 at a time t 1 after a predetermined time elapses from a time when the checked current value decreases below the second threshold value (t 0 ).
  • the processor 311 may determine the voltage value V bat2 checked at time t 1 as the second voltage value.
  • the processor 311 may calculate the internal resistance of the battery 320 based on the first voltage value V bat1 , the first current value I bat1 , and the second voltage value V bat2 . .
  • the processor 311 may store the calculated internal resistance in a memory.
  • the processor 311 may store, for example, the calculated internal resistance corresponding to the number of charging and discharging times of the battery 320.
  • the processor 311 may, for example, calculate the internal resistance each time charging and discharging the battery 320 and store it in a table form.
  • the processor 311 may control the charging voltage and charging current of the battery 320 based on the calculated internal resistance.
  • the charging voltage and charging current of the battery 320 may be a voltage and a current when charging the battery 320 with the received power. As the internal resistance of the battery 320 increases, when the charging voltage and the charging current of the battery 320 are set to be lower, the life of the battery 320 may increase.
  • the processor 311 may set the charging voltage and charging current of the battery 320 to be lower as the internal resistance of the battery 320 increases.
  • the processor 311 compares the calculated internal resistance with the internal resistance of the battery 320 in a pre-stored initial state, and controls the charging voltage and charging current of the battery 320 based on the comparison result. can do.
  • the internal resistance (R cycle_initial ) of the battery 320 in the initial state may mean, for example, an average value of the internal resistance of at least one battery 320 that has been calculated and stored up to a specific number of charging and discharging times.
  • the internal resistance of the battery 320 in the initial state is an average value of the internal resistance value calculated in the first charge and discharge, the internal resistance value calculated in the second charge and discharge, and the internal resistance values calculated in the third charge and discharge. I can. If the average value of the internal resistance calculated and stored up to a specific number of charge/discharge is used, the accuracy can be further improved.
  • the processor 311 is the ratio of the calculated internal resistance (R cycle(n) ) to the internal resistance (R cycle_initial ) of the battery 320 in an initial state (R cycle(n) / R cycle_initial ), the charging voltage and charging current of the battery 320 may be controlled to decrease.
  • Table 1 shows an exemplary charging voltage (eg, a buffer voltage, a charging voltage) and a charging current to be set according to the ratio of the calculated internal resistance to the internal resistance of the battery 320 in an initial state according to various embodiments. It is a table.
  • the processor 311 compares the internal resistance value of the battery 320 with the internal resistance value of the battery 320 in the initial state whenever the internal resistance of the battery 320 is calculated, and controls the charging voltage and the charging current based on the compared value. can do.
  • the values disclosed in Table 1 are exemplary values, and it is obvious that various values can be set and applied.
  • the processor 311 may calculate the internal resistance by periodically checking the current value of the battery 320 in response to the start of the power off procedure of the electronic device 101.
  • the power-off procedure of the electronic device 101 may occur at a certain voltage point of the battery 320, and since sufficient idle time can be secured after the power is turned off, the internal resistance of the battery 320 can be more accurately calculated.
  • FIG. 4 is a flowchart illustrating an operation of an electronic device 101 according to various embodiments of the present disclosure.
  • the processor 311 may periodically check the current value I bat of the battery 320.
  • the processor 311 may periodically check the current value of the battery 320 through the battery protection control device 330, for example.
  • the processor 311 in response to the checked current value of the battery 320 being equal to or greater than the first threshold value, the current value I bat of the battery 320 and the The voltage value (V bat ) can be periodically checked and saved.
  • the first threshold value may be, for example, a threshold current value capable of determining that power is supplied to a component included in the electronic device 101 or an external device connected to the electronic device 101 with a certain level or higher.
  • the processor 311 in response to a decrease in the checked current value of the battery 320 below the second threshold, in operation 430, the first current among the stored current and voltage values of the battery 320 The value and the first voltage value may be determined.
  • the processor 311 may first determine the stored current value of the battery 320 immediately before the checked current value of the battery 320 among the stored current values of the battery 320 decreases below the second threshold value. It can be determined by the current value.
  • the processor 311 may first determine the voltage value of the stored battery 320 immediately before the determined current value of the battery 320 among the stored voltage values of the battery 320 decreases below the second threshold value. It can be determined by the voltage value.
  • the second threshold value may be, for example, a threshold current value capable of determining that the electronic device 101 has entered an idle state.
  • the processor 311 in operation 440, checks the voltage value of the battery 320 after a predetermined time elapses from the time when the checked current value of the battery 320 decreases below the second threshold value.
  • the checked voltage value of the battery 320 may be determined as the second voltage value.
  • the predetermined time may be, for example, a pause time sufficient to determine that the voltage value of the battery 320 approaches the OCV value.
  • the processor 311 may control the charging voltage and charging current of the battery 320 based on the determined first voltage value, the second voltage value, and the first current value in operation 450.
  • a change amount of a voltage value may be calculated based on the first voltage value and the second voltage value, and the charging voltage and the charging current of the battery 320 may be controlled based on the change amount of the voltage value.
  • the internal resistance of the battery 320 may be calculated based on the determined first voltage value, the second voltage value, and the first current value.
  • the processor 311 compares the calculated internal resistance with the previously stored internal resistance of the battery 320 in an initial state, and calculates the charging voltage and charging current of the battery 320 based on the comparison result. Can be controlled.
  • the internal resistance (R cycle_initial ) of the battery 320 in the initial state may mean, for example, an average value of the internal resistance of at least one battery 320 that has been calculated and stored up to a specific number of charging and discharging times.
  • the processor 311 is the ratio of the calculated internal resistance (R cycle(n) ) to the internal resistance (R cycle_initial ) of the battery 320 in an initial state (R cycle(n) / R cycle_initial ), it is possible to control to lower the charging voltage and charging current of the battery 320.
  • FIG. 5 is a flowchart illustrating an operation of an electronic device 101 according to various embodiments of the present disclosure.
  • the processor 311 may periodically check the current value I bat of the battery 320 in operation 501.
  • the processor 311 may check whether the checked current value of the battery 320 is greater than or equal to the first threshold value.
  • the first threshold value may be, for example, a threshold current value capable of determining that power is supplied to a component included in the electronic device 101 or an external device connected to the electronic device 101 with a certain level or higher.
  • operation 501 may be branched again.
  • the checked current value of the battery 320 is greater than or equal to the first threshold value, branching to operation 505, the current value of the battery 320 (I bat ) and the voltage value of the battery 320 (V bat ) are periodically checked. Can be saved.
  • the processor 311 may check whether the checked current value of the battery 320 has decreased below the second threshold value.
  • the second threshold value may be, for example, a threshold current value capable of determining that the electronic device 101 has entered an idle state.
  • the process proceeds to operation 509, and the processor 311 includes a first current value and a first voltage value among the stored current value and voltage value of the battery 320 Can be determined.
  • the processor 311 may first determine the stored current value of the battery 320 immediately before the checked current value of the battery 320 among the stored current values of the battery 320 decreases below the second threshold value. It can be determined by the current value.
  • the processor 311 may first determine the voltage value of the stored battery 320 immediately before the determined current value of the battery 320 among the stored voltage values of the battery 320 decreases below the second threshold value. It can be determined by the voltage value.
  • the second threshold value may be, for example, a threshold current value capable of determining that the electronic device 101 has entered an idle state.
  • operation 508 may be branched to delete the stored current value and voltage value of the battery 320, and then branched back to operation 501. According to various embodiments, operation 508 may be omitted.
  • the processor 311 may start the timer when the checked current value of the battery 320 decreases below the second threshold in operation 511.
  • the timer may inform whether a predetermined time has elapsed from the start.
  • the processor 311 may check the current voltage value of the battery 320 and determine the determined voltage value as the second voltage value in response to the timer expiration.
  • the processor 311 may calculate an internal resistance (R cycle ) of the battery 320 based on the determined first voltage value, the second voltage value, and the first current value in operation 515.
  • the processor 311 may control the charging current and the charging voltage of the battery 320 based on the internal resistance of the battery 320 in operation 517.
  • the processor 311 compares the calculated internal resistance with the internal resistance of the battery 320 in a pre-stored initial state, and controls the charging voltage and charging current of the battery 320 based on the comparison result. can do.
  • the internal resistance (R cycle_initial ) of the battery 320 in the initial state may mean, for example, an average value of the internal resistance of at least one battery 320 that has been calculated and stored up to a specific number of charging and discharging times.
  • the processor 311 is the ratio of the calculated internal resistance (R cycle(n) ) to the internal resistance (R cycle_initial ) of the battery 320 in an initial state (R cycle(n) / R cycle_initial ), it is possible to control to lower the charging voltage and charging current of the battery 320.
  • An electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments disclosed in this document includes a battery (eg, the battery 320 of FIG. 3B ), a printed circuit board, a memory, and a processor (eg, FIG. 3B ). It may include a processor 311 of.
  • the processor may periodically check the current value of the battery, and in response to the checked current value of the battery being equal to or greater than a first threshold value, the processor may periodically check the current value and the voltage value of the battery Stored in a memory, and in response to a decrease in the checked current value of the battery to less than a second threshold value, a first current value and a first voltage value of the stored current value and voltage value of the stored battery are determined, and The voltage value of the battery, which is checked after a predetermined time elapses from when the current value decreases below the second threshold value, is determined as a second voltage value, and the first voltage value, the second voltage value, and the first Based on the current value, it may be configured to control the charging voltage and charging current of the battery.
  • the processor may calculate an internal resistance of the battery based on the first voltage value, the second voltage value, and the first current value, and the calculated internal resistance Based on, it may be configured to control the charging voltage and charging current of the battery.
  • the processor may be configured to store the calculated internal resistance corresponding to the number of charging and discharging times of the battery.
  • the processor compares the calculated internal resistance with the internal resistance of the battery in a pre-stored initial state, and based on the comparison result, the charging voltage and charging of the battery It can be configured to control the current.
  • the processor may be configured to lower the charging voltage and charging current of the battery as the ratio of the calculated internal resistance to the internal resistance of the battery in the initial state increases. I can.
  • the internal resistance of the battery in the initial state may be an average value of at least one internal resistance of the battery stored up to a specific number of charging and discharging times.
  • the processor in response to the checked current value of the battery being reduced to less than the second threshold value, may include the second threshold value among the stored current value and voltage value of the battery. It may be configured to determine a current value and a voltage value of the battery stored immediately before decreasing to less than the first current value and the first voltage value.
  • the processor may be configured to periodically check the current value of the battery in response to the start of a power-off procedure of the electronic device.
  • the second threshold value may be a threshold current value capable of determining that the electronic device has entered an idle state.
  • the first threshold is a state in which power is supplied to a certain level or higher to a component included in the electronic device or to an external device connected to the electronic device. May be a threshold current value.
  • a method for controlling battery charging of an electronic device includes periodically checking a current value of a battery (eg, the battery 320 of FIG. 3B ). Operation, in response to the checked current value of the battery being equal to or greater than the first threshold value, periodically checking and storing the current value and the voltage value of the battery, when the checked current value of the battery has decreased below a second threshold value. In response, an operation of determining a first current value and a first voltage value among current values and voltage values of the stored battery, and a predetermined time has elapsed from when the checked current value of the battery decreases below the second threshold value. Determining the voltage value of the battery checked as a second voltage value, and controlling the charging voltage and charging current of the battery based on the first voltage value, the second voltage value, and the first current value It may include.
  • the controlling may include determining the internal resistance of the battery based on the first voltage value, the second voltage value, and the first current value. An operation of calculating and controlling a charging voltage and a charging current of the battery based on the calculated internal resistance.
  • the battery charging control method of an electronic device may further include an operation of storing the calculated internal resistance corresponding to the number of charging/discharging times of the battery after the calculating operation.
  • the controlling operation may include an operation of comparing the calculated internal resistance with a pre-stored internal resistance of the battery, and the comparison result. And controlling the charging voltage and charging current of the battery.
  • the controlling operation is, as the ratio of the calculated internal resistance to the internal resistance of the battery in the initial state increases, the charging voltage of the battery and It may be an operation of controlling to lower the charging current.
  • the battery internal resistance in the initial state may be an average value of at least one internal resistance of the battery stored up to a specific number of charging and discharging times.
  • the determining of the first current value and the first voltage value in the battery charging control method of an electronic device may be performed when the checked current value of the battery is reduced to less than the second threshold value.
  • an operation of determining a current value and a voltage value of the battery stored immediately before decreasing to less than the second threshold among the stored current value and voltage value as the first current value and the first voltage value I can.
  • the operation of periodically checking the current value of the battery may be an operation performed in response to the start of a power-off procedure of the electronic device.
  • the second threshold value may be a threshold current value capable of determining that the electronic device has entered an idle state.
  • An electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments disclosed in this document includes a battery (eg, the battery 320 of FIG. 3B ), a printed circuit board, a memory, and a processor (eg, FIG. 3B ). It may include a processor 311 of.
  • the processor checks the voltage value of the battery, measures the first voltage value and the first current value of the battery and stores it in the memory in response to a decrease in the determined voltage value of the battery below a specified threshold value.
  • Electronic devices may be devices of various types.
  • the electronic device is, for example, a portable communication device (eg, a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, a portable power supply device (eg, a battery pack, an auxiliary battery), or a home appliance device. It may include.
  • the electronic device according to the embodiment of the present document is not limited to the above-described devices.
  • phrases such as “at least one of B or C” may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof.
  • Terms such as “first”, “second”, or “first” or “second” may be used simply to distinguish the component from other corresponding components, and the components may be referred to in other aspects (eg, importance or Order) is not limited.
  • Some (eg, a first) component is referred to as “coupled” or “connected” with or without the terms “functionally” or “communicatively” to another (eg, second) component. When mentioned, it means that any of the above components can be connected to the other components directly (eg by wire), wirelessly, or via a third component.
  • module used in this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic blocks, parts, or circuits.
  • the module may be an integrally configured component or a minimum unit of the component or a part thereof that performs one or more functions.
  • the module may be implemented in the form of an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • Various embodiments of the present document include one or more instructions stored in a storage medium (eg, internal memory 136 or external memory 138) readable by a machine (eg, electronic device 101). It may be implemented as software (for example, the program 140) including them.
  • the processor eg, the processor 120 of the device (eg, the electronic device 101) may call and execute at least one command among one or more commands stored from a storage medium. This makes it possible for the device to be operated to perform at least one function according to the at least one command invoked.
  • the one or more instructions may include code generated by a compiler or code executable by an interpreter.
  • a storage medium that can be read by a device may be provided in the form of a non-transitory storage medium.
  • non-transient only means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic wave), and this term refers to the case where data is semi-permanently stored in the storage medium. It does not distinguish between temporary storage cases.
  • a signal e.g., electromagnetic wave
  • a method according to various embodiments disclosed in the present document may be provided by being included in a computer program product.
  • Computer program products can be traded between sellers and buyers as commodities.
  • Computer program products are distributed in the form of a device-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or through an application store (e.g. Play StoreTM) or two user devices (e.g. It can be distributed (e.g., downloaded or uploaded) directly between, e.g. smartphones).
  • a device e.g. compact disc read only memory (CD-ROM)
  • an application store e.g. Play StoreTM
  • two user devices e.g. It can be distributed (e.g., downloaded or uploaded) directly between, e.g. smartphones).
  • at least a portion of the computer program product may be temporarily stored or temporarily generated in a storage medium that can be read by a device such as a server of a manufacturer, a server of an application store, or a memory of a relay server.
  • each component eg, a module or program of the above-described components may include a singular number or a plurality of entities.
  • one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added.
  • a plurality of components eg, a module or a program
  • the integrated component may perform one or more functions of each component of the plurality of components in the same or similar to that performed by the corresponding component among the plurality of components prior to the integration. .
  • operations performed by a module, program, or other component are sequentially, parallel, repeatedly, or heuristically executed, or one or more of the above operations are executed in a different order or omitted. Or one or more other actions may be added.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne, selon divers modes de réalisation, un dispositif électronique pouvant comprendre une batterie, une carte de circuit imprimé, une mémoire et un processeur. Selon divers modes de réalisation, le processeur peut être configuré pour : lire périodiquement une valeur de courant de la batterie ; en réponse à la valeur de courant lue de la batterie étant égale ou supérieure à une première valeur de seuil, lire périodiquement la valeur de courant et une valeur de tension de la batterie et les stocker dans la mémoire ; en réponse à la valeur de courant lue de la batterie étant réduite à moins d'une seconde valeur de seuil, déterminer une première valeur de courant et une première valeur de tension à partir des valeurs de courant et des valeurs de tension stockées de la batterie ; déterminer, en tant que seconde valeur de tension, une valeur de tension de la batterie qui est lue après une période de temps prédéterminée s'est écoulée depuis que la valeur de courant lue de la batterie diminue à moins de la seconde valeur de seuil ; et commander une tension de charge et un courant de charge de la batterie sur la base de la première valeur de tension, de la seconde valeur de tension et de la première valeur de courant. Divers autres modes de réalisation sont possibles.
PCT/KR2020/008549 2019-07-12 2020-06-30 Dispositif électronique comprenant une batterie et son procédé de commande de charge de batterie WO2021010622A1 (fr)

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CN116094083B (zh) * 2022-06-29 2024-03-12 荣耀终端有限公司 充电方法、装置及存储介质

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Publication number Priority date Publication date Assignee Title
JPH11259190A (ja) * 1998-03-11 1999-09-24 Nec Corp 電池駆動携帯端末における電力管理方法および装置
JP2005037151A (ja) * 2003-07-15 2005-02-10 Matsushita Electric Ind Co Ltd ２次電池の劣化判定回路
JP2006262614A (ja) * 2005-03-16 2006-09-28 Sanyo Electric Co Ltd 充電装置及び充電方法
JP2009044946A (ja) * 2007-07-13 2009-02-26 Sanyo Electric Co Ltd 組電池の充電方法
KR101741183B1 (ko) * 2011-11-24 2017-05-30 에스케이이노베이션 주식회사 배터리의 내부 저항 추정 장치 및 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11259190A (ja) * 1998-03-11 1999-09-24 Nec Corp 電池駆動携帯端末における電力管理方法および装置
JP2005037151A (ja) * 2003-07-15 2005-02-10 Matsushita Electric Ind Co Ltd ２次電池の劣化判定回路
JP2006262614A (ja) * 2005-03-16 2006-09-28 Sanyo Electric Co Ltd 充電装置及び充電方法
JP2009044946A (ja) * 2007-07-13 2009-02-26 Sanyo Electric Co Ltd 組電池の充電方法
KR101741183B1 (ko) * 2011-11-24 2017-05-30 에스케이이노베이션 주식회사 배터리의 내부 저항 추정 장치 및 방법

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