US20190115769A1 - Battery Management Circuit, Balancing Circuit, and Device to be Charged - Google Patents
Battery Management Circuit, Balancing Circuit, and Device to be Charged Download PDFInfo
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- US20190115769A1 US20190115769A1 US16/209,946 US201816209946A US2019115769A1 US 20190115769 A1 US20190115769 A1 US 20190115769A1 US 201816209946 A US201816209946 A US 201816209946A US 2019115769 A1 US2019115769 A1 US 2019115769A1
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
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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
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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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/02—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
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/40—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries adapted for charging from various sources, e.g. AC, DC or multivoltage
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- This disclosure relates to the field of charging technology, and more particularly to a battery management circuit and a battery management method, a balancing circuit and a balancing method, and a device to be charged.
- devices to be charged such as smart phones
- the device to be charged needs to be charged frequently due to its high power consumption.
- Implementations of the disclosure provide a battery management circuit and a battery management method, a balancing circuit and a balancing method, and a device to be charged, where, on the premise of guaranteed charging speed, heating of the device to be charged can be reduced.
- a battery management circuit includes a first charging channel, a balancing circuit, and a communication circuit.
- the first charging channel Through the first charging channel, charging voltage and/or charging current are received from a power supply device and applied directly to a battery for charging, where the battery includes a first cell and a second cell coupled in series.
- the communication circuit is configured to communicate with the power supply device to make magnitude of the charging voltage and/or charging current provided by the power supply device match a present charging stage of the battery.
- the balancing circuit is coupled with the first cell and the second cell and configured to balance voltage of the first cell and voltage of the second cell.
- the balancing circuit includes an RLC series circuit, a switch circuit, and a control circuit.
- the switch circuit has one end coupled with the first cell and the second cell and another end coupled with the RLC series circuit.
- the switch circuit has a control end coupled with the control circuit.
- the control circuit is configured to control the switch circuit to make the first cell and the second cell alternately form a closed loop with the RLC series circuit to provide input voltage for the RLC series circuit, when the voltage of the first cell and the voltage of the second cell are unbalanced.
- a device to be charged includes a battery and the battery management circuit according to the first aspect of the disclosure, where the battery includes a first cell and a second cell coupled in series.
- a balancing circuit includes an RLC series circuit, a switch circuit, and a control circuit.
- the switch circuit has one end coupled with a first cell and a second cell and another end coupled with the RLC series circuit, and the switch circuit has a control end coupled with the control circuit.
- the control circuit is configured to control the switch circuit to make the first cell and the second cell alternately form a closed loop with the RLC series circuit to provide input voltage for the RLC series circuit, when the voltage of the first cell and the voltage of the second cell are unbalanced.
- FIG. 1 is a schematic structural diagram illustrating a charging system according to an implementation of the present disclosure.
- FIG. 2 is a schematic diagram illustrating a coupling relationship between a balancing circuit and cells according to an implementation of the present disclosure.
- FIG. 3 is an equivalent circuit diagram illustrating an RLC series circuit according to an implementation of the present disclosure.
- FIG. 4 is a waveform diagram illustrating input voltage of an RLC series circuit according to an implementation of the present disclosure.
- FIG. 5 is a diagram illustrating correspondence between an input voltage waveform of an RLC series circuit and a current waveform of an RLC series circuit according to an implementation of the present disclosure.
- FIG. 6 is an exemplary diagram illustrating an alternative implementation of a switch circuit according to an implementation of the present disclosure.
- FIG. 7 is an exemplary diagram illustrating another alternative implementation of a switch circuit according to an implementation of the present disclosure.
- FIG. 8 is a flowchart illustrating a control method according to an implementation of the present disclosure.
- FIG. 9 is a flowchart illustrating a control method according to another implementation of the present disclosure.
- FIG. 10 is a schematic structural diagram illustrating a charging system according to another implementation of the present disclosure.
- FIG. 11 is a schematic structural diagram illustrating a device to be charged according to an implementation of the present disclosure.
- FIG. 12 is a schematic diagram illustrating a waveform of a pulsating direct current (DC) current according to an implementation of the present disclosure.
- FIG. 13 is a flowchart illustrating a quick charging process according to an implementation of the present disclosure.
- FIG. 14 is a schematic flowchart illustrating a battery management method according to an implementation of the present disclosure.
- a and/or B it means A alone, B alone, or both A and B.
- charging current and/or charging voltage it means charging current, charging voltage, or, both charging current and charging voltage.
- a power supply device configured to charge a device to be charged has been provided in the related art.
- the power supply device works in a constant-voltage mode, where voltage output by the power supply device remains nearly constant, such as 5V, 9V, 12V, 20V, etc.
- Voltage output by the power supply device is not suitable for being applied directly to a battery. Instead, the voltage output by the power supply device needs to be converted by a conversion circuit of the device to be charged, so that expected charging voltage and/or charging current of the battery of the device to be charged can be acquired.
- the conversion circuit is configured to convert voltage output by the power supply device, so as to meet the requirements on expected charging voltage and/or charging current of the battery.
- the conversion circuit can be a charging management module, such as a charging integrated circuit (IC), which, when the battery is charged, is configured to manage the charging voltage and/or charging current of the battery.
- the conversion circuit functions as a voltage feedback module and/or a current feedback module, so as to implement management of the charging voltage and/or charging current of the battery.
- a charging process of the battery can include at least one of a trickle charging stage, a constant-current charging stage, and a constant-voltage charging stage.
- the conversion circuit can utilize a current feedback loop, so as to make current flowing into the battery in the trickle charging stage satisfy expected charging current of the battery (such as a first charging current).
- the conversion circuit can utilize a current feedback loop, so as to make current flowing into the battery in the constant-current charging stage satisfy expected charging current of the battery (such as a second charging current, which may be higher than the first charging current).
- the conversion circuit can utilize a voltage feedback loop, so as to make voltage applied to the battery in the constant-voltage charging stage satisfy expected charging voltage of the battery.
- the conversion circuit when the voltage output by the power supply device is higher than expected charging voltage of the battery, the conversion circuit can be configured to decrease (that is, step down) the voltage output by the power supply device, so as to make decreased charging voltage meet requirements on the expected charging voltage of the battery.
- the conversion circuit when the voltage output by the power supply device is lower than the expected charging voltage of the battery, the conversion circuit can be configured to increase (that is, step up) the voltage output by the power supply device, so as to make increased charging voltage meet requirements on the expected charging voltage of the battery.
- the voltage output by the power supply device is a constant 5V voltage, for example.
- the conversion circuit such as a Buck circuit
- the conversion circuit can decrease the voltage output by the power supply device, so as to make the decreased charging voltage meet requirements on the expected charging voltage of the battery.
- the voltage output by the power supply device is a constant 5V voltage, for example.
- the conversion circuit such as a Boost circuit
- the conversion circuit can increase the voltage output by the power supply device, so as to make the increased charging voltage meet requirements on the expected charging voltage of the battery.
- the conversion circuit is limited by low circuit conversion efficiency, which results in electrical energy that fails to be converted dissipating in the form of heat.
- the heat can be accumulated inside the device to be charged. Since designed space and heat dissipation space of the device to be charged are both very small, for example, the physical size of a user's mobile terminal is increasingly lighter and thinner, and a large number of electronic components are densely arranged in the mobile terminal at the same time, difficulty in designing the conversion circuit is increased. In addition, it is difficult to remove promptly heat accumulated inside the device to be charged, which in turn results in abnormality of the device to be charged.
- heat accumulated inside the conversion circuit may cause heat interference with electronic components near the conversion circuit, which results in working abnormality of the electronic components.
- the heat accumulated inside the conversion circuit may shorten service life of the conversion circuit and the electronic components near the conversion circuit.
- the heat accumulated inside the conversion circuit may cause heat interference with the battery, which in turn brings about abnormality of charge and discharge of the battery.
- the heat accumulated inside the conversion circuit may raise temperature of the device to be charged and thus influence user experience in the charging process.
- the heat accumulated inside the conversion circuit may result in short circuit of the conversion circuit itself, causing abnormality of charging since the voltage output by the power supply device is applied directly to the battery. In case that the battery is charged with overvoltage for a long time, battery explosion may even occur, thus putting users at risk.
- a power supply device with adjustable output voltage can acquire state information of a battery.
- the state information of a battery can include present power and/or present voltage of the battery.
- the power supply device can adjust output voltage of the power supply device itself according to the state information of the battery acquired, so as to meet requirements on expected charging voltage and/or charging current of the battery.
- Output voltage adjusted by the power supply device can be applied directly to the battery to charge the battery (referred to as “direct charging” hereinafter).
- direct charging in the constant-current charging stage of the battery, the output voltage adjusted by the power supply device can be applied directly to the battery for charging.
- the power supply device can function as a voltage feedback module and/or a current feedback module, so as to achieve management of the charging voltage and/or charging current of the battery.
- the power supply device configured to adjust the output voltage of the power supply device itself according to the state information of the battery acquired can be configured to acquire the state information of the battery in real time and adjust the output voltage of the power supply device itself according to real-time state information of the battery acquired each time, so as to meet requirements on the expected charging voltage and/or charging current of the battery.
- the power supply device configured to adjust the output voltage of the power supply device itself according to the real-time state information of the battery acquired can be configured to acquire, with increase in voltage of the battery in the charging process, current state information of the battery at different time points in the charging process and adjust in real time the output voltage of the power supply device itself according to the current state information of the battery, so as to meet requirements on the expected charging voltage and/or charging current of the battery.
- the charging process of the battery can include at least one of the trickle charging stage, the constant-current charging stage, and the constant-voltage charging stage.
- the power supply device can output the first charging current in the tricked charging stage to charge the battery, so as to meet requirements on expected charging current (the first charging current can be a constant DC current) of the battery.
- the power supply device can utilize the current feedback loop to make the current output in the constant-current charging stage from the power supply device to the battery meet requirements of the battery on expected charging current, such as the second charging current.
- the second charging current may be a pulsating waveform current and may be larger than the first charging current, where a peak value (that is, peak current) of the pulsating waveform current in the constant-current charging stage may be greater than magnitude of the constant DC current in the trickle charging stage, and “constant-current” in the constant-current charging stage may refer to a situation where peak value or average value of the pulsating waveform current remain nearly constant.
- the power supply device can utilize the voltage feedback loop to make the voltage output in the constant-voltage charging stage from the power supply device to the device to be charged (that is, constant DC voltage) remain constant.
- the power supply device can be mainly configured to control the constant-current charging stage of the battery of the device to be charged.
- control of the trickle charging stage and the constant-voltage charging stage of the battery of the device to be charged can also be cooperatively completed by the power supply device of the implementation of the present disclosure and an extra charging chip of the device to be charged.
- charging powers of the battery received in the trickle charging stage and in the constant-voltage charging stage are lower, so conversion efficiency loss and heat accumulation of the charging chip of the device to be charged are acceptable.
- the constant-current charging stage or the constant-current stage can refer to a charging mode of controlling output current of the power supply device but does not require that the output current of the power supply device remain completely constant, and may be, for example, a peak value or an average value of a pulsating waveform current output by the power supply device remaining nearly constant, or remaining nearly constant within a certain time period.
- the power supply device usually charges the battery in a multi-stage constant current charging manner.
- Multi-stage constant current charging can include N constant-current stages, where N is an integer not less than two.
- a first stage charging begins with a pre-determined charging current.
- the N constant-current stages of the multi-stage constant current charging are executed in sequence from the first stage to an N th stage.
- the peak value or average value of the pulsating waveform may decrease.
- voltage of the battery reaches a threshold value of charging cut-off voltage, the previous constant-current stage ends and the next constant-current stage begins.
- a current conversion process between two adjacent constant-current stages may be a gradual process or in a step-like manner.
- the constant-current mode can refer to a charging mode of controlling a peak value or an average value of the pulsating DC current, that is, controlling the peak value of the current output by the power supply device not greater than current corresponding to the constant-current mode.
- the constant-current mode can refer to a charging mode of controlling a peak value of the AC current.
- the device to be charged can be a terminal.
- the “terminal” can include but is not limited to a device configured via a wired line and/or a wireless interface to receive/transmit communication signals.
- Examples of the wired line may include, but are not limited to, at least one of a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct connection cable, and/or other data connection lines or network connection lines.
- Examples of the wireless interface may include, but are not limited to, a wireless interface with a cellular network, a wireless local area network (WLAN), a digital television network (such as a digital video broadcasting-handheld (DVB-H) network), a satellite network, an AM-FM broadcast transmitter, and/or with other communication terminals.
- a communication terminal configured to communicate via a wireless interface may be called a “wireless communication terminal”, a “wireless terminal”, and/or a “mobile terminal”.
- Examples of a mobile terminal may include, but are not limited to, a satellite or cellular telephone, a personal communication system (PCS) terminal capable of cellular radio telephone, data processing, fax, and/or data communication, a personal digital assistant (PDA) equipped with radio telephone, pager, Internet/Intranet access, web browsing, notebook, calendar, and/or global positioning system (GPS) receiver, and/or other electronic devices equipped with radio telephone capability such as a conventional laptop or a handheld receiver.
- the device to be charged or terminal can also include a power bank. The power bank can be charged by the power supply device and thus store the energy to charge other electronic devices.
- charging current when a pulsating waveform voltage output by the power supply device is applied directly to a battery of the device to be charged to charge the battery, charging current can be represented in the form of a pulsating wave (such as a steamed bun wave). It can be understood that, the charging current can charge the battery in an intermittent manner. Period of the charging current can vary with frequency of an input AC such as an AC power grid. For instance, frequency corresponding to the period of the charging current is N times (N is a positive integer) or N times the reciprocal of frequency of a power grid. Additionally, when the charging current charges the battery in an intermittent manner, current waveform corresponding to the charging current can include one pulsation or one group of pulsations synchronized with the power grid.
- the battery when the battery is charged (such as in at least one of the trickle charging stage, the constant-current charging stage, and the constant-voltage charging stage), the battery can receive a pulsating DC (direction remains constant, and magnitude varies with time), an AC (both direction and magnitude vary with time), or a DC (that is, a constant DC, neither magnitude nor direction varies with time) output by the power supply device.
- a pulsating DC direction remains constant, and magnitude varies with time
- an AC both direction and magnitude vary with time
- a DC that is, a constant DC, neither magnitude nor direction varies with time
- the device to be charged usually has only one single cell.
- heating of the device to be charged is serious.
- structure of the cell of the device to be charged is modified in the implementation of the present disclosure.
- a battery with cells coupled in series, together with a battery management circuit that is able to conduct direct charging on the battery with cells coupled in series, is provided. Since, to achieve equal charging speed, charging current of the battery with cells coupled in series is 1/N time the magnitude of charging current of the battery with one single cell, where N represents the number of cells coupled in series of the device to be charged.
- the battery management circuit of the implementation of the present disclosure acquires smaller charging current from an external power supply device, thereby reducing heating in the charging process. The following will describe the implementation of the disclosure in detail in conjunction with FIG. 1 .
- FIG. 1 is a schematic structural diagram illustrating a charging system according to an implementation of the present disclosure.
- the charging system includes a power supply device 10 , a battery management circuit 20 , and a battery 30 .
- the battery management circuit 20 can be configured to manage the battery 30 .
- the battery management circuit 20 can be configured to manage a charging process of the battery 30 , such as selecting a charging channel, controlling charging voltage and/or charging current, and so on.
- the battery management circuit 20 can be configured to manage cells of the battery 30 , such as balancing voltage between the cells of the battery 30 .
- the battery management circuit 20 can include a first charging channel 21 and a communication circuit 23 .
- charging voltage and/or charging current can be received from the power supply device 10 and applied to the battery 30 for charging.
- direct charging can be conducted on the battery 30 by applying directly the charging voltage and/or charging current received from the power supply device 10 to the battery 30 .
- “Direct charging” is elaborated in the whole disclosure and will not be repeated herein.
- the first charging channel 21 can be referred to as a direct charging channel.
- the direst charging channel does not need to be provided with a conversion circuit such as a charging IC. That is to say, unlike a conventional charging channel, through the direct charging channel, the charging voltage and/or charging current received from the power supply device do not need to be converted and then applied to the battery. Instead, through the direct charging channel, the charging voltage and/or charging current received from the power supply device can be applied directly to the battery.
- the first charging channel 21 can be, for example, a wire.
- the first charging channel 21 can be provided with other circuit components unrelated to charging voltage and/or charging current conversion.
- the battery management circuit 20 includes the first charging channel 21 and a second charging channel.
- the first charging channel 21 can be provided with a switch component configured to switch between charging channels, which will be described in detail in FIG. 10 .
- the power supply device 10 can be the power supply device with adjustable output voltage mentioned above.
- the types of the power supply device 10 are not limited herein.
- the power supply device 10 can be a device specially configured to charge such as an adaptor, a power bank, etc., or other devices that are able to provide both power and data service such as a computer.
- the battery 30 can include multiple cells coupled in series (at least two cells).
- the cells coupled in series can be configured to divide the charging voltage provided by the power supply device 10 in the charging process.
- a first cell 31 a and a second cell 31 b can be any two of the multiple cells or any two groups of the multiple cells.
- the first cell 31 a (or the second cell 31 b ) includes a group of cells, all cells in this cell-group can be coupled in series or in parallel.
- the coupling manners of the cells are not limited herein.
- the battery 30 can be one battery or multiple batteries. That is to say, the cells coupled in series according to the implementations of the present disclosure can be packaged into one battery pack to form one battery or be packaged into multiple battery packs to form multiple batteries.
- the battery 30 can be one battery.
- the one battery includes the first cell 31 a and the second cell 31 b coupled in series.
- the battery 30 can include two batteries. One of the two batteries includes the first cell 31 a , and the other one of the two batteries includes the second cell 31 b.
- the communication circuit 23 can be configured to communicate with the power supply device 10 , so as to make magnitude of the charging voltage and/or charging current received from the power supply device 10 match a present charging stage of the battery 30 , or make magnitude of the charging voltage and/or charging current received from the power supply device 10 meet requirements on the charging voltage and/or charging current in the present charging stage of the battery 30 .
- the first charging channel 21 is a direct charging channel, through which the charging voltage and/or charging current received from the power supply device 10 can be applied directly to the battery 30 .
- the implementations of the present disclosure introduce in the battery management circuit 20 a control circuit with a communication function, that is, the communication circuit 23 .
- the communication circuit 23 can be configured to keep communicating with the power supply device 10 in a direct charging process to form a closed-loop feedback mechanism, so as to enable the power supply device 10 to acquire the state information of the battery in real time, thus adjusting continuously the charging voltage and/or charging current flowing into the first charging channel to guarantee that magnitude of the charging voltage and/or charging current received from the power supply device 10 matches the present charging stage of the battery 30 .
- the present charging stage of the battery 30 can be any one of the trickle charging stage, the constant-current charging stage, and the constant-voltage charging stage.
- the communication circuit 23 can be configured to communicate with the power supply device 10 , so that the power supply device 10 can adjust charging current provided for the first charging channel 21 , to make the charging current match charging current corresponding to the trickle charging stage, or make the charging current to meet requirements on charging current in the trickle charging stage of the battery 30 .
- the communication circuit 23 can be configured to communicate with the power supply device 10 , so that the power supply device 10 can adjust charging voltage provided for the first charging channel 21 , to make the charging voltage match charging voltage corresponding to the constant-voltage charging stage, or make the charging voltage meet requirements on charging voltage in the constant-voltage charging stage of the battery 30 .
- the communication circuit 23 can be configured to communicate with the power supply device 10 , so that the power supply device 10 can adjust charging current provided for the first charging channel 21 , to make the charging current match charging current corresponding to the constant-current charging stage, or make the charging current meet requirements on charging current in the constant-current charging stage of the battery 30 .
- the battery management circuit 20 can further include a balancing circuit 22 .
- the balancing circuit 22 can be coupled with the first cell 31 a and the second cell 31 b to balance the voltage of the first cell 31 a and the voltage of the second cell 31 b.
- the battery management circuit 20 can be configured to conduct direct charging on the battery.
- the battery management circuit 20 according to the implementation of the present disclosure is a battery management circuit that supports a direct charging architecture.
- the direct charging channel does not need to be provided with a conversion circuit, which in turn reduces heating of the device to be charged in the charging process.
- Direct charging scheme can reduce heating of the device to be charged in the charging process to some extent.
- charging current received from the power supply device 10 is excessive, such as an output current of the power supply device 10 reaching a magnitude between 5 A and 10 A, heating of the battery management circuit 20 is still serious, and thus safety problems may occur.
- structure of the battery is modified in the implementations of the present disclosure.
- a battery with cells coupled in series is provided.
- charging current of the battery with cells coupled in series is 1/N time the magnitude of charging current of a battery with one single cell, where N represents the number of cells coupled in series of the device to be charged. That is to say, as to an equal charging speed, the implementations of the present disclosure can substantially reduce magnitude of charging current, thereby further reducing heating of the device to be charged in the charging process.
- a charging current of 9 A (ampere) is needed to reach a charging speed of 3 C (Coulomb).
- 3 C Coulomb
- two cells, each of 1500 mAh can be coupled in series to replace the single cell of 3000 mAh.
- a charging current of 4.5 A is needed to reach the charging speed of 3 C.
- the charging current of 4.5 A produces substantially less heat than the charging current of 9 A.
- the power management circuit in the implementations of the present disclosure can be configured to balance voltage between cells coupled in series and make parameters of the cells coupled in series be approximate, so as to facilitate unified management of cells of the battery. Furthermore, in case that the battery includes multiple cells, keeping parameters between the cells consistent can improve overall performance and service life of the battery.
- charging voltage received from the power supply device 10 needs to be higher than total voltage of the battery 30 .
- working voltage of a single cell is between 3.0V and 4.35V.
- output voltage of the power supply device 10 can be set equal to or higher than 10V.
- the balancing circuit 22 can be implemented in various manners.
- the implementations of the disclosure provide a balancing circuit based on an RLC series circuit. The following will describe in detail the balancing circuit based on an RLC series circuit in conjunction with FIG. 2 to FIG. 9 .
- the balancing circuit 22 includes an RLC series circuit 25 , a switch circuit 26 , and a control circuit 27 .
- the switch circuit 26 has one end coupled with the first cell 31 a and the second cell 31 b and another end coupled with the RLC series circuit 25 .
- the switch circuit 26 has a control end coupled with the control circuit 27 .
- the control circuit 27 is configured to control the switch circuit 26 to make the first cell 31 a and the second cell 31 b alternately form a closed loop with the RLC series circuit 25 to provide input voltage for the RLC series circuit 25 , when the voltage of the first cell 31 a and the voltage of the second cell 31 b are unbalanced.
- the control circuit 27 can be configured to control the switch circuit 26 to make the first cell 31 a and the second cell 31 b alternately be a voltage source of the RLC series circuit 25 to provide input voltage for the RLC series circuit 25 .
- VG 1 represents an equivalent power supply of the RLC series circuit 25 formed by the first cell 31 a and the second cell 31 b being alternately coupled with the RLC series circuit 25 .
- the voltage of the first cell 31 a is 4.3V and the voltage of the second cell 31 b is 4.2V.
- a voltage waveform of VG 1 is illustrated in FIG. 4 .
- the input voltage can be divided into a DC component of a 4.25V voltage and an AC component of a 4.25V voltage.
- V pp of the AC component is 0.5V.
- FIG. 5 is a diagram illustrating correspondence between a waveform of Current I in the RLC series circuit 25 and a voltage waveform of VG 1 of the RLC series circuit. It should be understood that, the specific value of I depends on overall impedance of the RLC series circuit 25 and is not limited herein.
- the balancing circuit in the implementations of the disclosure is a balancing circuit based on an RLC series circuit.
- the balancing circuit has a simple circuit structure and is able to reduce complexity of a battery management circuit.
- the number of components of the RLC series circuit is small and total impedance of the RLC series circuit is low. Therefore, heating is low during working of the balancing circuit.
- the waveform of the current I in the RLC series circuit 25 is illustrated in FIG. 5 .
- the impedance of the RLC series circuit 25 is excessively high, magnitude of the current I is low, and a balancing process between the voltage of the first cell 31 a and the voltage of the second cell 31 b is slow.
- the RLC series circuit 25 has a resonant characteristic.
- the magnitude of the current I in the RLC series circuit 25 depends on voltage frequency of VG 1 (that is, the frequency of the input voltage of the RLC series circuit 25 ). The more the voltage frequency of VG 1 approximates to resonant frequency of the RLC series circuit 25 , the higher the current in the RLC series circuit 25 is.
- the control circuit 27 can control the switch circuit 26 , to make frequency of the input voltage of the RLC series circuit 25 approximate to the resonant frequency of the RLC series circuit 25 , which can substantially improve efficiency in energy transfer between the first cell 31 a and the second cell 31 b .
- Inductor L and Capacitor C When the RLC series circuit 25 is in a resonant state, Inductor L and Capacitor C have voltages which are equal in magnitude and opposite in phase, and thus the voltages can cancel each other out, which makes Inductor L and Capacitor C form a short circuit (Inductor L and Capacitor C are equivalent to a wire).
- the RLC series circuit 25 becomes a pure resistance circuit, magnitude of the current I in the RLC series circuit 25 reaches a maximum value, and efficiency in energy transfer in the balancing circuit 22 reaches the highest level.
- the configuration of the switch circuit 26 is not limited herein, as long as the first cell 31 a and the second cell 31 b can be alternately coupled with the RLC series circuit 25 through on-off of a switch component(s) of the switch circuit 26 .
- the following will provide several alternative implementations of the switch circuit 26 .
- FIG. 6 illustrates an alternative implementation of the switch circuit.
- the switch circuit includes a first switch transistor Q 1 , a second switch transistor Q 2 , a third switch transistor Q 3 , and a fourth switch transistor Q 4 .
- the first switch transistor Q 1 has a first connected end 60 coupled with a positive electrode of the first cell 31 a and a second connected end 61 coupled with a first connected end 63 of the second switch transistor Q 2 .
- the second switch transistor Q 2 has a second connected end 64 coupled with a first connected end 66 of the third switch transistor Q 3 and a negative electrode of the first cell 31 a .
- the third switch transistor Q 3 has a second connected end 67 coupled with a first connected end 69 of the fourth switch transistor Q 4 .
- the fourth switch transistor Q 4 has a second connected end 70 coupled with a negative electrode of the second cell 31 b .
- the second cell 31 b has a positive electrode coupled with a negative electrode of the first cell 31 a .
- the first switch transistor Q 1 has a control end 62 coupled with the control circuit 27 .
- the second switch transistor Q 2 has a control end 65 coupled with the control circuit 27 .
- the third switch transistor Q 3 has a control end 68 coupled with the control circuit 27 .
- the fourth switch transistor Q 4 has a control end 71 coupled with the control circuit 27 .
- Components of the RLC series circuit (including a capacitor C, an inductor L, and a resistor R illustrated in FIG. 6 ) are coupled in series between the second connected end 61 of the first switch transistor Q 1 and the second connected end 67 of the third switch transistor Q 3 .
- FIG. 7 illustrates another alternative implementation of the switch circuit.
- the switch circuit includes a first switch transistor Q 1 , a second switch transistor Q 2 , a third switch transistor Q 3 , and a fourth switch transistor Q 4 .
- the first switch transistor Q 1 has a first connected end 60 coupled with a positive electrode of the first cell 31 a and a second connected end 61 coupled with a first connected end 63 of the second switch transistor Q 2 .
- the second switch transistor Q 2 has a second connected end 64 coupled with a first connected end 66 of the third switch transistor Q 3 .
- the third switch transistor Q 3 has a second connected end 67 coupled with a first connected end 69 of the fourth switch transistor Q 4 .
- the fourth switch transistor Q 4 has a second connected end 70 coupled with a negative electrode of the second cell 31 b .
- the second cell 31 b has a positive electrode coupled with a negative electrode of the first cell 31 a .
- the first switch transistor Q 1 has a control end 62 coupled with the control circuit 27 .
- the second switch transistor Q 2 has a control end 65 coupled with the control circuit 27 .
- the third switch transistor Q 3 has a control end 68 coupled with the control circuit 27 .
- the fourth switch transistor Q 4 has a control end 71 coupled with the control circuit 27 .
- At least part of components of the RLC series circuit are coupled in series between the second connected end 64 of the second switch transistor Q 2 and the negative electrode of the first cell 31 a , and components of the RLC series circuit, other than the above mentioned at least part of components of the RLC series circuit coupled in series between the second connected end 64 of the second switch transistor Q 2 and the negative electrode of the first cell 31 a , are coupled in series between the second connected end 61 of the first switch transistor Q 1 and the second connected end 67 of the third switch transistor Q 3 .
- the at least part of components of the RLC series circuit mentioned above can be at least one of Capacitor C, Inductor L, and Resistor R.
- the at least part of components of the RLC series circuit mentioned above can be Inductor L, and the components other than the at least part of components of the RLC series circuit, can be Capacitor C and Resistor R.
- the at least part of components of the RLC series circuit mentioned above can be Inductor L and Capacitor C, and the components of the RLC series circuit, other than the at least part of components of the RLC series circuit, can be Resistor R.
- the at least part of components of the RLC series circuit mentioned above can be Resistor R, Capacitor C, and Inductor L, and there is no other component except the at least part of components of the RLC series circuit.
- the second connected end 61 of the first switch transistor Q 1 can be coupled with the second connected end 67 of the third switch transistor Q 3 directly through wires.
- the switch transistor mentioned above can be, for example, a MOS (metal oxide semiconductor) transistor.
- the connected end of the switch transistor mentioned above can be a source electrode and/or a drain electrode of the switch transistor.
- the control end of the switch transistor can be a grid electrode of the switch transistor.
- FIG. 8 is a flowchart illustrating a control method according to an implementation of the present disclosure.
- FIG. 8 describes a situation where the voltage of the first cell 31 a and the voltage of the second cell 31 b are unbalanced and the voltage of the first cell 31 a is higher than the voltage of the second cell 31 b .
- the control method illustrated in FIG. 8 includes operations at block 810 to block 840 . The following will describe the method in detail.
- a dead time can be understood as a protection time, which aims to avoid the first switch transistor Q 1 and the third switch transistor Q 3 being simultaneously in the on-state with the second switch transistor Q 2 and the fourth switch transistor Q 4 and thus resulting in circuit fault.
- value of t3-t2 can be equal to value of t1-t0, that is, a time period of the second switch transistor Q 2 and the fourth switch transistor Q 4 being in the on-state can be equal to a time period of the first switch transistor Q 1 and the third switch transistor Q 3 being in the on-state.
- the second dead time can be equal to the first dead time.
- work frequency of the control circuit 27 can be made to be equal to the resonant frequency of the RLC series circuit, which can make frequency of the input voltage of the RLC series circuit be equal to the resonant frequency of the RLC series circuit, thereby prompting the RLC series circuit to reach the resonant state.
- FIG. 8 illustrates a control time sequence of the control circuit 27 in any work period. Control time sequences of other work periods are similar and will not be repeated herein.
- FIG. 9 is a flowchart illustrating a control method according to another implementation of the present disclosure.
- FIG. 9 describes a situation where the voltage of the first cell 31 a and the voltage of the second cell 31 b are unbalanced and the voltage of the second cell 31 b is higher than the voltage of the first cell 31 a .
- the control method of FIG. 9 is similar to that of FIG. 8 , and the difference lies in that in FIG. 9 , the on and off order of the first switch transistor Q 1 and the third switch transistor Q 3 are exchanged with that of the second switch transistor Q 2 and the fourth switch transistor Q 4 .
- the control method illustrated in FIG. 9 includes operations at block 910 to block 940 . The following will describe the method in detail.
- value of t3-t2 can be equal to value of t1-t0, that is, a time period of the second switch transistor Q 2 and the fourth switch transistor Q 4 being in the on-state can be equal to a time period of the first switch transistor Q 1 and the third switch transistor Q 3 being in the on-state.
- the second dead time can be equal to the first dead time.
- work frequency of the control circuit 27 can be made to be equal to the resonant frequency of the RLC series circuit, which can make frequency of the input voltage of the RLC series circuit be equal to the resonant frequency of the RLC series circuit, thereby prompting the RLC series circuit to reach the resonant state.
- FIG. 9 illustrates a control time sequence of the control circuit 27 in any work period. Control time sequences of other work periods are similar and will not be repeated herein.
- the battery management circuit 20 can further include a second charging channel 24 .
- the second charging channel 24 is provided with a boost circuit 25 .
- the boost circuit 25 is configured to receive initial voltage from the power supply device 10 and increase the initial voltage to a target voltage to charge the battery 30 according to the target voltage.
- the initial voltage is lower than total voltage of the battery 30 and the target voltage is higher than the total voltage of the battery 30 .
- the battery management circuit 20 can further include a second control circuit 28 .
- the second control circuit 28 can be configured to control switching between the first charging channel 21 and the second charging channel 24 .
- direct charging is conducted on cells of the battery 30 , and direct charging requires that charging voltage received from the power supply device 10 be higher than total voltage of cells coupled in series of the battery.
- the charging voltage received from the power supply device 10 is required to be at least higher than 8V.
- output voltage of a conventional power supply device is usually unable to reach 8V (for example, a conventional adaptor usually provides an output voltage of 5V), which results in the conventional power supply device being unable to charge the battery 30 through the first charging channel 21 .
- the second charging channel 24 is provided herein.
- the second charging channel 24 is provided with a boost circuit 25 , and the boost circuit 25 is configured to increase the initial voltage provided by the power supply device 10 to a target voltage to make the target voltage be higher than the total voltage of the battery 30 , so as to solve the problem of the conventional power supply device being unable to charge the battery 30 with multiple cells coupled in series according to the implementations of the disclosure.
- the configuration of the boost circuit 25 is not limited herein.
- a Boost circuit or a charge pump can be adopted to increase voltage.
- the second charging channel 24 can adopt a conventional charging channel design, that is, the second charging channel 24 can be provided with a conversion circuit, such as a charging IC.
- the conversion circuit can take constant-voltage and constant-current control of the charging process of the battery 30 and adjust (such as boost or buck) the initial voltage received from the power supply device 10 according to actual needs.
- the initial voltage received from the power supply device 10 can be increased to the target voltage by utilizing a boost function of the conversion circuit.
- the communication circuit 23 can achieve switching between the first charging channel 21 and the second charging channel 24 through a switch component.
- the first charging channel 21 is provided with a switch transistor Q 5 .
- the communication circuit 23 controls the switch transistor Q 5 to switch-on, the first charging channel 21 works and direct charging is conducted on the battery 30 through the first charging channel 21 .
- the second charging channel 24 works and charging is conducted on the battery 30 through the second charging channel 24 .
- a device to be charged is provided. As illustrated in FIG. 11 , the device to be charged 40 can include the battery management circuit 20 and the battery 30 described above.
- a single-cell power supply scheme is generally adopted for charging in a device to be charged (such as a terminal).
- Multiple cells coupled in series are proposed in implementations of the disclosure. Total voltage of the multiple cells is high and is therefore unsuitable to be used directly to supply power to the device to be charged.
- a practical scheme is to adjust working voltage of the system of the device to be charged, so as to enable the system of the device to be charged to support power supply of multiple cells at the same time.
- this scheme results in too many modifications to the device to be charged and high cost.
- the device to be charged 40 can be provided with a buck circuit, so as to make decreased voltage meet requirements of the device to be charged 40 on power supply voltage.
- working voltage of a single cell is 3.0V to 4.35V.
- the buck circuit can be configured to decrease the total voltage of the battery 30 to a value between 3.0V and 4.35V.
- the buck circuit can be implemented in various manners, such as a Buck circuit, a charge pump, etc., to decrease voltage.
- a power supply circuit of the device to be charged 40 has an input end that can be coupled with both ends of any one single cell of the battery 30 .
- the power supply circuit can supply power to the system of the device to be charged 40 according to voltage of the one single cell.
- voltage decreased by the buck circuit may have ripples and in turn influence power supply quality of the device to be charged.
- the implementations of the disclosure still adopt one single cell to supply power to the system of the device to be charged, due to steady voltage output by one single cell. Therefore, in the implementations of the disclosure, while a problem of how to supply power based on a multiple-cell scheme is solved, power supply quality of the system of the device to be charged can be guaranteed.
- the balancing circuit 22 is used to balance voltage between cells, thereby keeping voltage between the cells of the battery 30 balanced even if the above single-cell power supply scheme is adopted.
- the power supply device 10 can be controlled to output a pulsating DC current (also referred to as a one-way pulsating output current, a pulsating waveform current, or a steamed bun-wave current). Since the direct charging manner is adopted to charge the battery 30 through the first charging channel 21 , the pulsating DC current received from the power supply device 10 can be applied directly to the battery 30 . As illustrated in FIG. 12 , magnitude of the pulsating DC current varies periodically. Compared with a constant DC current, the pulsating DC current can reduce lithium precipitation of a cell, thereby increasing service life of the cell. In addition, compared with the constant DC current, the pulsating DC current can decrease possibility and intensity in arcing of a contact of a charging interface, thereby increasing service life of the charging interface.
- a pulsating DC current also referred to as a one-way pulsating output current, a pulsating waveform current, or a steamed bun-wave current. Since the
- Adjusting charging current output by the power supply device 10 to the pulsating DC current can be achieved in various manners. For example, a primary filtering circuit and a secondary filtering circuit of the power supply device 10 can be removed, so as to make the power supply device 10 output the pulsating DC current.
- the charging current received from the power supply device 10 by the first charging channel 21 can be an AC current, for example, a primary filtering circuit, a secondary rectifying circuit, and a secondary filtering circuit of the power supply device 10 can be removed to make the power supply device 10 output the AC current.
- the AC current can also reduce lithium precipitation of the cell and increase the service life of the cell.
- the power supply device 10 is selectively operable in a first charging mode or a second charging mode. Charging speed of the power supply device 10 charging the battery 30 in the second charging mode is faster than that of the power supply device 10 charging the battery 30 in the first charging mode. In other words, compared with the power supply device 10 working in the first charging mode, the power supply device 10 working in the second charging mode takes less time to charge battery of the same capacity. In addition, in some implementations, in the first charging mode, the power supply device 10 charges the battery 30 through the second charging channel 24 ; in the second charging mode, the power supply device 10 charges the battery 30 through the first charging channel 21 .
- the first charging mode can be a normal charging mode.
- the second charging mode can be a quick charging mode.
- the power supply device In the normal charging mode, the power supply device outputs smaller current (usually smaller than 2.5 A) or adopts low power (usually lower than 15 W) to charge the battery of the device to be charged. In the normal charging mode, charging fully a battery of high capacity (such as a 3000 mA battery) usually takes several hours.
- the power supply device can output larger current (usually larger than 2.5 A, such as 4.5 A, 5 A, or even larger) or adopt higher power (usually higher than or equal to 15 W) to charge the battery of the device to be charged.
- the power supply device can charge fully the battery of the same capacity within a substantially shorter charging period and at a higher charging speed.
- the communication circuit 23 can be configured to conduct two-way communication with the power supply device 10 , to control output of the power supply device 10 in the second charging mode, that is, to control the charging voltage and/or charging current provided by the power supply device 10 in the second charging mode.
- the device to be charged 40 can include a charging interface.
- the communication circuit 23 is configured to communicate with the power supply device 10 through a data line of the charging interface.
- the charging interface can be a USB interface.
- the data line can be a D+ line and/or a D ⁇ line of the USB interface.
- the device to be charged 40 can be further configured to conduct wireless communication with the power supply device 10 .
- the communication circuit 23 can be configured to communicate with the power supply device 10 , interact with present total voltage and/or present power of the battery 30 of the device to be charged 40 , and adjust output voltage and/or output current of the power supply device 10 according to the present total voltage and/or present power of the battery 30 .
- the following will describe in detail the content communicated between the communication circuit 23 and the power supply device 10 and the control manners of the communication circuit 23 on output of the power supply device 10 in the second charging mode in conjunction with specific implementations of the disclosure.
- any one of the power supply device 10 and the device to be charged can function as a master device to initiate a two-way communication, and correspondingly the other one of the power supply device 10 and the device to be charged can function as a slave device to make a first response or a first reply to the communication initiated by the master device.
- identities of the master device and the slave device can be determined by comparing levels of the power supply device 10 and the device to be charged with reference to earth in a communication process.
- any one of the power supply device 10 and the device to be charged can function as the master device to initiate the communication, and correspondingly the other one of the power supply device 10 and the device to be charged can function as the slave device to make the first response or the first reply to the communication initiated by the master device.
- the master device can make a second response to the first response or the first reply of the slave device, as such, the master device and the slave device complete a negotiation on charging modes.
- charging between the master device and the slave device can be executed after completion of multiple negotiations on charging modes between the master device and the slave device, so as to guarantee that the charging process is safe and reliable after negotiations.
- the master device can make the second response to the first response or the first reply to the communication of the slave device as follows.
- the master device receives from the slave device the first response or the first reply to the communication and makes the second response to the first response or the first reply of the slave device.
- the master device makes the second response to the first response or the first reply of the slave device as follows.
- the master device and the slave device complete a negotiation on charging modes. Charging between the master device and the slave device is executed in the first charging mode or in the second charging mode according to the negotiation result, that is, the power supply device 10 is operable in the first charging mode or in the second charging mode to charge the device to be charged according to the negotiation.
- the master device can also make the second response to the first response or the first reply to the communication of the slave device as follows.
- the master device fails to receive from the slave device the first response or the first reply to the communication within a preset time period, the master device can still make the second response to the first response or the first reply made by the slave device.
- the master device fails to receive from the slave device the first response or the first reply to the communication within a preset time period, the master device can still make the second response to the first response or the first reply made by the slave device as follows: the master device and the slave device complete a negotiation on charging modes. Charging is executed in the first charging mode between the master device and the slave device, that is, the power supply device is operable in the first charging mode to charge the device to be charged.
- the power supply device 10 after the device to be charged, as the main device, initiates the communication and the power supply device 10 , as the subordinate device, makes the first response or the first reply to the communication initiated by the main device, without the device to be charged making the second response to the first response or the first reply of the power supply device 10 , it can be regarded as the main device and the subordinate device completing a negotiation on charging modes, and thus the power supply device 10 can determine to charge the device to be charged in the first charging mode or in the second charging mode according to the negotiation.
- the communication circuit 23 conducts two-way communication with the power supply device 10 , so as to control output of the power supply device 10 in the second charging mode as follows.
- the communication circuit 23 conducts two-way communication with the power supply device 10 , so as to negotiate charging modes between the power supply device 10 and the device to be charged.
- the communication circuit 23 conducts two-way communication with the power supply device 10 to negotiate charging modes between the power supply device 10 and the device to be charged as follows.
- the communication circuit 23 receives a first instruction from the power supply device 10 , the first instruction is for enquiring whether the device to be charged enable (in other words, switches on) the second charging mode; the communication circuit 23 sends a reply instruction of the first instruction to the power supply 10 , the reply instruction of the first instruction is for indicating whether the device to be charged agrees to enable the second charging mode; in case that the device to be charged agrees to enable the second charging mode, the communication circuit 23 controls the power supply device 10 to charge the battery 30 though the first charging channel 21 .
- the communication circuit 23 conducts two-way communication with the power supply device 10 to control output of the power supply device 10 in the second charging mode as follows.
- the communication circuit 23 conducts two-way communication with the power supply device 10 , so as to determine charging voltage which is output by the power supply device in the second charging mode and used for charging the device to be charged.
- the communication circuit 23 conducts two-way communication with the power supply device 10 , so as to determine charging voltage which is output by the power supply device in the second charging mode and used for charging the device to be charged as follows.
- the communication circuit 23 receives a second instruction from the power supply device 10 , the second instruction is for enquiring whether the charging voltage output by the power supply device 10 matches present total voltage of the battery 30 of the device to be charged; the communication circuit 23 sends a reply instruction of the second instruction to the power supply 10 , the reply instruction of the second instruction is for indicating that the voltage output by the power supply device 10 matches the present total voltage of the battery 30 or does not match, that is, is at higher voltage levels, or is at lower voltage levels.
- the second instruction can be for enquiring whether it is suitable to use present output-voltage of the power supply device 10 as the charging voltage, which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged.
- the reply instruction of the second instruction is for indicating whether the present output-voltage of the power supply device 10 is suitable or unsuitable, that is, at higher voltage levels or at lower voltage levels.
- the present output-voltage of the power supply device 10 matching the present total voltage of the battery 30 , or the present output-voltage of the power supply device 10 being suitable to be used as the charging voltage which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged can be understood as follows.
- the present output-voltage of the power supply device 10 is slightly higher than the present total voltage of the battery, and the difference between the output-voltage of the power supply device 10 and the present total voltage of the battery is within a preset range (usually at a level of several hundred millivolts (mV)).
- the communication circuit 23 can conduct two-way communication with the power supply device 10 , so as to control output of the power supply device 10 in the second charging mode as follows.
- the communication circuit 23 conducts two-way communication with the power supply device 10 , so as to determine charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged.
- the communication circuit 23 can conduct two-way communication with the power supply device 10 to determine charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged as follows.
- the communication circuit 23 receives a third instruction sent by the power supply device 10 , the third instruction is for enquiring a maximum charging current the device to be charged supports; the communication circuit 23 sends a reply instruction of the third instruction to the power supply device 10 , the reply instruction of the third instruction is for indicating the maximum charging current the device to be charged supports, so that the power supply device 10 can determine the charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged, according to the maximum charging current the device to be charged supports.
- the communication circuit 23 determining the charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged according to the maximum charging current the device to be charged supports can be implemented in various manners.
- the power supply device 10 can determine the maximum charging current the device to be charged supports as the charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged, or comprehensively take into account the maximum charging current the device to be charged supports and other factors such as current output capability of the power supply device 10 itself to determine the charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged.
- the communication circuit 23 conducts two-way communication with the power supply device 10 to control output of the power supply device 10 in the second charging mode as follows.
- the communication circuit 23 conducts two-way communication with the power supply device 10 to adjust output-current of the power supply device 10 in the second charging mode.
- the communication circuit 23 conducts two-way communication with the power supply device 10 to adjust the output-current of the power supply device 10 as follows.
- the communication circuit 23 receives a fourth instruction from the power supply device 10 , the fourth instruction is for enquiring present total voltage of the battery; the communication circuit 23 sends a reply instruction of the fourth instruction to the power supply device 10 , the reply instruction of the fourth instruction is for indicating the present total voltage of the battery, so that the power supply device 10 can adjust the output-current of the power supply device 10 according to the present total voltage of the battery.
- the communication circuit 23 conducts two-way communication with the power supply device 10 , so as to control output of the power supply device 10 in the second charging mode as follows.
- the communication circuit 23 conducts two-way communication with the power supply device 10 to determine whether there is contact failure in a charging interface.
- the communication circuit 23 can conduct two-way communication with the power supply device 10 to determine whether there is contact failure in the charging interface as follows.
- the communication circuit 23 receives a fourth instruction sent by the power supply device 10 , the fourth instruction is for enquiring present voltage of the battery of the device to be charged; the communication circuit 23 sends a reply instruction of the fourth instruction to the power supply device 10 , the reply instruction of the fourth instruction is for indicating the present voltage of the battery of the device to be charged, so that the power supply device 10 can determine whether there is contact failure in the charging interface according to output voltage of the power supply 10 and the present voltage of the battery of the device to be charged.
- the power supply device 10 determines that difference between the output voltage of the power supply 10 and the present voltage of the battery of the device to be charged is greater than a preset voltage threshold value, it indicates that impedance, which is obtained by the difference (that is, the difference between the output voltage of the power supply 10 and the present voltage of the battery of the device to be charged) divided by output-current of the power supply device 10 , is greater than a preset impedance threshold value, it can be determined that there is contact failure in the charging interface.
- contact failure in the charging interface can be determined by the device to be charged.
- the communication circuit 23 sends a sixth instruction to the power supply device 10 , the sixth instruction is for enquiring output-voltage of the power supply device 10 ; the communication circuit 23 receives a reply instruction of the sixth instruction from the power supply device 10 , the reply instruction of the sixth instruction is for indicating the output-voltage of the power supply device 10 , the communication circuit 23 determines whether there is contact failure in the charging interface according to present voltage of the battery and the output-voltage of the power supply 10 .
- the communication circuit 23 can send a fifth instruction to the power supply device 10 , the fifth instruction is for indicating contact failure in the charging interface. After receiving the fifth instruction, the power supply device 10 can exit the second charging mode.
- FIG. 13 is just for those skilled in the art to understand the implementations of the disclosure, instead of limiting the implementations of the disclosure to specific numeric values or specific situations of the example. Those skilled in the art can make equivalent modifications and changes without departing from the scope of the implementations of the disclosure.
- the communication procedure between the power supply device 10 and the device to be charged 40 (also referred to as the communication procedure of a quick charging process) can include the following five stages.
- the device to be charged 40 can detect the type of the power supply device 10 though data line D+ and data line D ⁇ .
- the power supply device 10 is detected to be a power supply device specially configured to charge such as an adaptor, current absorbed by the device to be charged 40 can be higher than a preset current threshold value I2 (can be 1 A, for example).
- I2 can be 1 A, for example.
- the power supply device 10 detects that output-current of the power supply device 10 is larger than or equal to I2 within a preset duration (can be a continuous time period T 1 , for example), the power supply device 10 can consider that identification of the type of the power supply device by the device to be charged 40 is completed.
- the power supply device 10 begins a negotiation process with the device to be charged 40 and send Instruction 1 (corresponding to the first instruction mentioned above), so as to enquire whether the device to be charged 40 agrees to be charged by the power supply device 10 in the second charging mode.
- the power supply device 10 When the power supply device 10 receives a reply instruction of Instruction 1 and the reply instruction of Instruction 1 indicates that the device to be charged 40 disagrees to be charged by the power supply device 10 in the second charging mode, the power supply device 10 detects once again the output-current of the power supply device 10 . When the output-current of the power supply device 10 is still larger than or equal to I2 within a preset continuous duration (can be a continuous time period T 1 ), the power supply device 10 sends once again Instruction 1 to enquire whether the device to be charged 40 agrees to be charged by the power supply device 10 in the second charging mode. The power supply device 10 repeats the above operations at Stage 1 until the device to be charged 40 agrees to be charged by the power supply device 10 in the second charging mode, or the output-current of the power supply device 10 is no longer larger than or equal to I2.
- the output voltage of the power supply device 10 can include multiple grades.
- the power supply device 10 sends Instruction 2 (corresponding to the second instruction mentioned above) to enquire whether the output voltage of the power supply device 10 (present output-voltage) matches present voltage of the battery 30 of the device to be charged 40 .
- the device to be charged 40 sends a reply instruction of Instruction 2 to indicate whether the output voltage of the power supply device 10 matches the present voltage of the battery 30 of the device to be charged 40 or does not match, that is, is at higher levels, or is at lower levels.
- the reply instruction of Instruction 2 indicates that the output voltage of the power supply device 10 is at higher levels or is at lower levels
- the power supply device 10 can adjust the output voltage of the power supply device 10 by one grade and send once again Instruction 2 to the device to be charged 40 to enquire whether the output voltage of the power supply device 10 matches the present voltage of the battery. Repeat the above operations until the device to be charged 40 determines that the output voltage of the power supply device 10 matches the present voltage of the battery 30 of the device to be charged 40 . and proceed to Stage 3.
- the power supply device 10 sends Instruction 3 (corresponding to the third instruction mentioned above) to enquire a maximum charging current the device to be charged 40 supports.
- the device to be charged 40 sends a reply instruction of Instruction 3 to indicate the maximum charging current the device to be charged 40 supports. Proceed to Stage 4.
- the power supply device 10 determines, according to the maximum charging current the device to be charged 40 supports, the charging current which is output by the power supply device 10 in the second charging mode and used for charging the device to be charged 40 . Proceed to Stage 5, the constant-current charging stage.
- the power supply device 10 can send Instruction 4 (corresponding to the fourth instruction mentioned above) to the device to be charged 40 at certain time intervals, so as to enquire present voltage of the battery 30 of the device to be charged 40 .
- the device to be charged 40 can send a reply instruction of Instruction 4 to feed back the present voltage of the battery.
- the power supply device 10 can determine whether the charging interface is in a good contact and whether it is necessary to reduce the output current of the power supply device 10 , according to the present voltage of the battery. When the power supply device 10 determines that there is contact failure in the charging interface, the power supply device 10 can send Instruction 5 (corresponding to the fifth instruction mentioned above), thereby exiting the second charging mode and being reset to return to Stage 1.
- the reply instruction of Instruction 1 can carry path impedance data (or information) of the device to be charged 40 .
- the path impedance data of the device to be charged 40 can be used for determining whether the charging interface is in a good contact at Stage 5.
- duration from when the device to be charged 40 agrees to be charged by the power supply device 10 in the second charging mode to when the power supply device 10 adjusts the output voltage thereof to a suitable charging voltage can be controlled within a certain range.
- the power supply device 10 or the device to be charged 40 can determine that the communication process is abnormal, being reset to return to Stage 1.
- the device to be charged 40 can send the reply instruction of Instruction 2 to indicate that the output voltage of the power supply device 10 matches the voltage of the battery of the device to be charged 40 .
- adjusting speed of the output current of the power supply device 10 can be controlled within a certain range, so as to avoid abnormality of the charging process resulting from excessively high adjusting speed.
- change magnitude of the output current of the power supply device 10 can be controlled within 5%.
- the power supply device 10 can detect in real time impedance of charging path. Specifically, the power supply device 10 can detect the impedance of charging path according to the output voltage and the output current of the power supply device 10 and the present voltage of the battery fed back by the device to be charged 40 . When the impedance of charging path is higher than the impedance of path of the device to be charged 40 plus impedance of a charging cable, it indicates that there is contact failure in the charging interface, and thus the power supply device 10 stops charging the device to be charged 40 in the second charging mode.
- time intervals of communication between the power supply device 10 and the device to be charged 40 can be controlled within a certain range, to avoid abnormality of communication resulting from excessively short time intervals of communication.
- stopping of the charging process can include a recoverable stopping and a non-recoverable stopping.
- the charging process stops, a charging communication process is reset, and the charging process enters again Stage 1. Then, when the device to be charged 40 disagrees to be charged by the power supply device 10 in the second charging mode, the communication procedure will not proceed to Stage 2.
- the stopping of the charging process in this case can be considered as the non-recoverable stopping.
- the charging process stops, the charging communication process is reset, and the charging process enters again Stage 1.
- the device to be charged 40 agrees to be charged by the power supply device 10 in the second charging mode, so as to recover the charging process.
- the stopping of the charging process in this case can be considered as the recoverable stopping.
- the charging process stops and is reset to enter again Stage 1. Then, the device to be charged 40 disagrees to be charged by the power supply device 10 in the second charging mode. After the battery returns to normal and the requirements on Stage 1 are satisfied, the device to be charged 40 agrees to be charged by the power supply device in the second charging mode.
- the stopping of the quick charging process in this case can be considered as the recoverable stopping.
- the above communication steps or operations of FIG. 13 are just illustrative.
- handshake communication between the device to be charged 40 and the power supply device 10 can also be initiated by the device to be charged 40 .
- the device to be charged 40 sends Instruction 1, to enquire whether the power supply device 10 enables the second charging mode.
- the power supply device 10 begins to charge the battery of the device to be charged 40 in the second charging mode.
- the communication procedure can further include the constant-voltage charging stage.
- the device to be charged 40 can feed back the present voltage of the battery to the power supply device 10 .
- the charging stage turns to the constant-voltage charging stage from the constant-current charging stage.
- the charging current gradually decreases.
- the charging current decreases to a certain threshold value, it indicates that the battery of the device to be charged 40 is fully charged, and thus the whole charging process is stopped.
- FIG. 14 is a schematic flowchart illustrating a battery management method according to an implementation of the present disclosure.
- the battery management method illustrated in FIG. 14 is applicable to a battery management circuit including a first charging channel, a balancing circuit, and a communication circuit.
- the battery includes a first cell and a second cell coupled in series.
- the balancing circuit is coupled with the first cell and the second cell and configured to balance voltage of the first cell and voltage of the second cell.
- the balancing circuit includes an RLC series circuit, a switch circuit, and a control circuit.
- the switch circuit has one end coupled with the first cell and the second cell and another end coupled with the RLC series circuit, and the switch circuit has a control end coupled with the control circuit.
- the battery management method includes operations at blocks 1410 to 1420 . The following will describe the method in detail.
- the communication circuit communicates with the power supply device to make magnitude of the charging voltage and/or charging current received from the power supply device match a present charging stage of the battery.
- the control circuit controls the switch circuit to make the first cell and the second cell alternately form a closed loop with the RLC series circuit to provide input voltage for the RLC series circuit.
- control circuit controls the switch circuit to make frequency of input voltage of the RLC series circuit be equal to resonant frequency of the RLC series circuit.
- the switch circuit includes a first switch transistor, a second switch transistor, a third switch transistor, and a fourth switch transistor.
- the first switch transistor has a first connected end coupled with a positive electrode of the first cell and a second connected end coupled with a first connected end of the second switch transistor.
- the second switch transistor has a second connected end coupled with a first connected end of the third switch transistor and a negative electrode of the first cell.
- the third switch transistor has a second connected end coupled with a first connected end of the fourth switch transistor.
- the fourth switch transistor has a second connected end coupled with a negative electrode of the second cell.
- the second cell has a positive electrode coupled with a negative electrode of the first cell.
- the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor each has a control end coupled with the control circuit.
- Components of the RLC series circuit are coupled in series between the second connected end of the first switch transistor and the second connected end of the third switch transistor.
- the switch circuit includes a first switch transistor, a second switch transistor, a third switch transistor, and a fourth switch transistor.
- the first switch transistor has a first connected end coupled with a positive electrode of the first cell and a second connected end coupled with a first connected end of the second switch transistor.
- the second switch transistor has a second connected end coupled with a first connected end of the third switch transistor.
- the third switch transistor having a second connected end coupled with a first connected end of the fourth switch transistor.
- the fourth switch transistor having a second connected end coupled with a negative electrode of the second cell.
- the second cell having a positive electrode coupled with a negative electrode of the first cell.
- the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor each has a control end coupled with the control circuit. At least part of components of the RLC series circuit are coupled in series between the second connected end of the second switch transistor and the negative electrode of the first cell. Components of the RLC series circuit, other than the at least part of components of the RLC series circuit (that is, those coupled in series between the second connected end of the second switch transistor and the negative electrode of the first cell) are coupled in series between the second connected end of the first switch transistor and the second connected end of the third switch transistor.
- operations at block 1420 can include the following.
- control the first switch transistor and the third switch transistor to an on-state from time t0 to time t1 and control the second switch transistor and the fourth switch transistor to an off-state from time t0 to time t1, where time t0 represents a start time of a work period of the control circuit; control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to the off-state from time t1 to time t2, where a time period from time t1 to time t2 represents a preset first dead time; control the second switch transistor and the fourth switch transistor to the on-state from time t2 to time t3 and control the first switch transistor and the third switch transistor to the off-state from time t2 to time t
- working frequency of the control circuit is equal to the resonant frequency of the RLC series circuit.
- operations at block 1420 can include the following.
- control the second switch transistor and the fourth switch transistor to an on-state from time t0 to time t1 and control the first switch transistor and the third switch transistor to an off-state from time t0 to time t1, where time t0 represents a start time of a work period of the control circuit; control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to the off-state from time t1 to time t2, where a time period from time t1 to time t2 represents a preset first dead time; control the first switch transistor and the third switch transistor to the on-state from time t2 to time t3 and control the second switch transistor and the fourth switch transistor to the off-state from time t2 to time t
- working frequency of the control circuit is equal to the resonant frequency of the RLC series circuit.
- the battery management circuit further includes a second charging channel provided with a boost circuit
- the boost circuit is configured to receive initial voltage from the power supply device and increase the initial voltage to a target voltage to charge the battery according to the target voltage, when the power supply device charges the battery through the second charging channel.
- the initial voltage is lower than total voltage of the battery and the target voltage is higher than the total voltage of the battery.
- the above example illustrates the balancing circuit 22 , as a part of the battery management circuit 20 , providing a balancing method to balance the voltage of the first cell 31 a and the voltage of the second cell 31 b , where the first cell 31 a and the second cell 31 b are coupled in series and managed by the battery management circuit 20 .
- implementations of the disclosure are not limited to the above example. Practically, the balancing circuit 22 can be applied to any situation where voltage between cells needs to be balanced.
- the systems, apparatuses, and methods disclosed in implementations herein may also be implemented in various other manners.
- the above apparatus implementations are merely illustrative, e.g., the division of units (including sub-units) is only a division of logical functions, and there may exist other ways of division in practice, e.g., multiple units (including sub-units) or components may be combined or may be integrated into another system, or some features may be ignored or not included.
- the coupling or direct coupling or communication connection as illustrated or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical, or otherwise.
- Separated units may or may not be physically separated.
- Components or parts displayed as units (including sub-units) may or may not be physical units, and may reside at one location or may be distributed to multiple networked units. Some or all of the units (including sub-units) may be selectively adopted according to practical needs to achieve desired objectives of the disclosure.
- various functional units may be integrated into one processing unit or may be present as a number of physically separated units, and two or more units may be integrated into one.
- the integrated units are implemented as software functional units and sold or used as standalone products, they may be stored in a computer readable storage medium.
- Computer software products can be stored in a storage medium and may include multiple instructions that, when executed, can cause a computing device, e.g., a personal computer, a server, a second adapter, a network device, etc., to execute some or all operations of the methods as described in the various implementations.
- the above storage medium may include various kinds of media that can store program code, such as a USB flash disk, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
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Abstract
Description
- This application is a continuation of International Application No. PCT/CN2017/087829, filed on Jun. 9, 2017, which claims priority to International Application No. PCT/CN2016/101944, filed on Oct. 12, 2016 and International Application No. PCT/CN2017/073653, filed on Feb. 15, 2017, the disclosures of all of which are hereby incorporated by reference in their entireties.
- This disclosure relates to the field of charging technology, and more particularly to a battery management circuit and a battery management method, a balancing circuit and a balancing method, and a device to be charged.
- At present, devices to be charged, such as smart phones, are enjoying increasing popularity among consumers. However, the device to be charged needs to be charged frequently due to its high power consumption.
- In order to improve charging speed, a practical scheme is to charge the device to be charged with large current. The larger the current, the higher the charging speed is. Nevertheless, the heating problem of the device to be charged is also getting more serious.
- Therefore, requirements on reducing heating of the device to be charged are proposed.
- Implementations of the disclosure provide a battery management circuit and a battery management method, a balancing circuit and a balancing method, and a device to be charged, where, on the premise of guaranteed charging speed, heating of the device to be charged can be reduced.
- According to a first aspect of the disclosure, a battery management circuit is provided. The battery management circuit includes a first charging channel, a balancing circuit, and a communication circuit. Through the first charging channel, charging voltage and/or charging current are received from a power supply device and applied directly to a battery for charging, where the battery includes a first cell and a second cell coupled in series. When the power supply device charges the battery through the first charging channel, the communication circuit is configured to communicate with the power supply device to make magnitude of the charging voltage and/or charging current provided by the power supply device match a present charging stage of the battery. The balancing circuit is coupled with the first cell and the second cell and configured to balance voltage of the first cell and voltage of the second cell. The balancing circuit includes an RLC series circuit, a switch circuit, and a control circuit. The switch circuit has one end coupled with the first cell and the second cell and another end coupled with the RLC series circuit. The switch circuit has a control end coupled with the control circuit. The control circuit is configured to control the switch circuit to make the first cell and the second cell alternately form a closed loop with the RLC series circuit to provide input voltage for the RLC series circuit, when the voltage of the first cell and the voltage of the second cell are unbalanced.
- According to a second aspect of the disclosure, a device to be charged is provided. The device to be charged includes a battery and the battery management circuit according to the first aspect of the disclosure, where the battery includes a first cell and a second cell coupled in series.
- According to a third aspect of the disclosure, a balancing circuit is provided. The balancing circuit includes an RLC series circuit, a switch circuit, and a control circuit. The switch circuit has one end coupled with a first cell and a second cell and another end coupled with the RLC series circuit, and the switch circuit has a control end coupled with the control circuit. The control circuit is configured to control the switch circuit to make the first cell and the second cell alternately form a closed loop with the RLC series circuit to provide input voltage for the RLC series circuit, when the voltage of the first cell and the voltage of the second cell are unbalanced.
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FIG. 1 is a schematic structural diagram illustrating a charging system according to an implementation of the present disclosure. -
FIG. 2 is a schematic diagram illustrating a coupling relationship between a balancing circuit and cells according to an implementation of the present disclosure. -
FIG. 3 is an equivalent circuit diagram illustrating an RLC series circuit according to an implementation of the present disclosure. -
FIG. 4 is a waveform diagram illustrating input voltage of an RLC series circuit according to an implementation of the present disclosure. -
FIG. 5 is a diagram illustrating correspondence between an input voltage waveform of an RLC series circuit and a current waveform of an RLC series circuit according to an implementation of the present disclosure. -
FIG. 6 is an exemplary diagram illustrating an alternative implementation of a switch circuit according to an implementation of the present disclosure. -
FIG. 7 is an exemplary diagram illustrating another alternative implementation of a switch circuit according to an implementation of the present disclosure. -
FIG. 8 is a flowchart illustrating a control method according to an implementation of the present disclosure. -
FIG. 9 is a flowchart illustrating a control method according to another implementation of the present disclosure. -
FIG. 10 is a schematic structural diagram illustrating a charging system according to another implementation of the present disclosure. -
FIG. 11 is a schematic structural diagram illustrating a device to be charged according to an implementation of the present disclosure. -
FIG. 12 is a schematic diagram illustrating a waveform of a pulsating direct current (DC) current according to an implementation of the present disclosure. -
FIG. 13 is a flowchart illustrating a quick charging process according to an implementation of the present disclosure. -
FIG. 14 is a schematic flowchart illustrating a battery management method according to an implementation of the present disclosure. - In the following, when we refer to “A and/or B”, it means A alone, B alone, or both A and B. For example, when we refer to “charging current and/or charging voltage”, it means charging current, charging voltage, or, both charging current and charging voltage.
- A power supply device configured to charge a device to be charged has been provided in the related art. The power supply device works in a constant-voltage mode, where voltage output by the power supply device remains nearly constant, such as 5V, 9V, 12V, 20V, etc.
- Voltage output by the power supply device is not suitable for being applied directly to a battery. Instead, the voltage output by the power supply device needs to be converted by a conversion circuit of the device to be charged, so that expected charging voltage and/or charging current of the battery of the device to be charged can be acquired.
- The conversion circuit is configured to convert voltage output by the power supply device, so as to meet the requirements on expected charging voltage and/or charging current of the battery.
- As an implementation, the conversion circuit can be a charging management module, such as a charging integrated circuit (IC), which, when the battery is charged, is configured to manage the charging voltage and/or charging current of the battery. The conversion circuit functions as a voltage feedback module and/or a current feedback module, so as to implement management of the charging voltage and/or charging current of the battery.
- For example, a charging process of the battery can include at least one of a trickle charging stage, a constant-current charging stage, and a constant-voltage charging stage. In the trickle charging stage, the conversion circuit can utilize a current feedback loop, so as to make current flowing into the battery in the trickle charging stage satisfy expected charging current of the battery (such as a first charging current). In the constant-current charging stage, the conversion circuit can utilize a current feedback loop, so as to make current flowing into the battery in the constant-current charging stage satisfy expected charging current of the battery (such as a second charging current, which may be higher than the first charging current). In the constant-voltage charging stage, the conversion circuit can utilize a voltage feedback loop, so as to make voltage applied to the battery in the constant-voltage charging stage satisfy expected charging voltage of the battery.
- As one implementation, when the voltage output by the power supply device is higher than expected charging voltage of the battery, the conversion circuit can be configured to decrease (that is, step down) the voltage output by the power supply device, so as to make decreased charging voltage meet requirements on the expected charging voltage of the battery. As another implementation, when the voltage output by the power supply device is lower than the expected charging voltage of the battery, the conversion circuit can be configured to increase (that is, step up) the voltage output by the power supply device, so as to make increased charging voltage meet requirements on the expected charging voltage of the battery.
- As yet another implementation, the voltage output by the power supply device is a constant 5V voltage, for example. When the battery includes a single cell (for example, a lithium battery cell, with a 4.2V charging cut-off voltage), the conversion circuit (such as a Buck circuit) can decrease the voltage output by the power supply device, so as to make the decreased charging voltage meet requirements on the expected charging voltage of the battery.
- As still another implementation, the voltage output by the power supply device is a constant 5V voltage, for example. When the power supply device charges two or more single-cell batteries coupled in series (for example, a lithium battery cell, with a 4.2V charging cut-off voltage), the conversion circuit (such as a Boost circuit) can increase the voltage output by the power supply device, so as to make the increased charging voltage meet requirements on the expected charging voltage of the battery.
- The conversion circuit is limited by low circuit conversion efficiency, which results in electrical energy that fails to be converted dissipating in the form of heat. The heat can be accumulated inside the device to be charged. Since designed space and heat dissipation space of the device to be charged are both very small, for example, the physical size of a user's mobile terminal is increasingly lighter and thinner, and a large number of electronic components are densely arranged in the mobile terminal at the same time, difficulty in designing the conversion circuit is increased. In addition, it is difficult to remove promptly heat accumulated inside the device to be charged, which in turn results in abnormality of the device to be charged.
- For example, heat accumulated inside the conversion circuit may cause heat interference with electronic components near the conversion circuit, which results in working abnormality of the electronic components. For another example, the heat accumulated inside the conversion circuit may shorten service life of the conversion circuit and the electronic components near the conversion circuit. For yet another example, the heat accumulated inside the conversion circuit may cause heat interference with the battery, which in turn brings about abnormality of charge and discharge of the battery. For still another example, the heat accumulated inside the conversion circuit may raise temperature of the device to be charged and thus influence user experience in the charging process. For still another example, the heat accumulated inside the conversion circuit may result in short circuit of the conversion circuit itself, causing abnormality of charging since the voltage output by the power supply device is applied directly to the battery. In case that the battery is charged with overvoltage for a long time, battery explosion may even occur, thus putting users at risk.
- According to an implementation of the present disclosure, a power supply device with adjustable output voltage is provided. The power supply device can acquire state information of a battery. The state information of a battery can include present power and/or present voltage of the battery. The power supply device can adjust output voltage of the power supply device itself according to the state information of the battery acquired, so as to meet requirements on expected charging voltage and/or charging current of the battery. Output voltage adjusted by the power supply device can be applied directly to the battery to charge the battery (referred to as “direct charging” hereinafter). In addition, in the constant-current charging stage of the battery, the output voltage adjusted by the power supply device can be applied directly to the battery for charging.
- The power supply device can function as a voltage feedback module and/or a current feedback module, so as to achieve management of the charging voltage and/or charging current of the battery.
- The power supply device configured to adjust the output voltage of the power supply device itself according to the state information of the battery acquired can be configured to acquire the state information of the battery in real time and adjust the output voltage of the power supply device itself according to real-time state information of the battery acquired each time, so as to meet requirements on the expected charging voltage and/or charging current of the battery.
- The power supply device configured to adjust the output voltage of the power supply device itself according to the real-time state information of the battery acquired can be configured to acquire, with increase in voltage of the battery in the charging process, current state information of the battery at different time points in the charging process and adjust in real time the output voltage of the power supply device itself according to the current state information of the battery, so as to meet requirements on the expected charging voltage and/or charging current of the battery.
- For example, the charging process of the battery can include at least one of the trickle charging stage, the constant-current charging stage, and the constant-voltage charging stage. In the trickle charging stage, the power supply device can output the first charging current in the tricked charging stage to charge the battery, so as to meet requirements on expected charging current (the first charging current can be a constant DC current) of the battery. In the constant-current charging stage, the power supply device can utilize the current feedback loop to make the current output in the constant-current charging stage from the power supply device to the battery meet requirements of the battery on expected charging current, such as the second charging current. The second charging current may be a pulsating waveform current and may be larger than the first charging current, where a peak value (that is, peak current) of the pulsating waveform current in the constant-current charging stage may be greater than magnitude of the constant DC current in the trickle charging stage, and “constant-current” in the constant-current charging stage may refer to a situation where peak value or average value of the pulsating waveform current remain nearly constant. In the constant-voltage charging stage, the power supply device can utilize the voltage feedback loop to make the voltage output in the constant-voltage charging stage from the power supply device to the device to be charged (that is, constant DC voltage) remain constant.
- For example, in implementations of the present disclosure, the power supply device can be mainly configured to control the constant-current charging stage of the battery of the device to be charged. In other implementations, control of the trickle charging stage and the constant-voltage charging stage of the battery of the device to be charged can also be cooperatively completed by the power supply device of the implementation of the present disclosure and an extra charging chip of the device to be charged. Compared with charging power of the battery received in the constant-current charging stage, charging powers of the battery received in the trickle charging stage and in the constant-voltage charging stage are lower, so conversion efficiency loss and heat accumulation of the charging chip of the device to be charged are acceptable. It should be noted that, in implementations of the present disclosure, the constant-current charging stage or the constant-current stage can refer to a charging mode of controlling output current of the power supply device but does not require that the output current of the power supply device remain completely constant, and may be, for example, a peak value or an average value of a pulsating waveform current output by the power supply device remaining nearly constant, or remaining nearly constant within a certain time period. Practically, for example, in the constant-current charging stage, the power supply device usually charges the battery in a multi-stage constant current charging manner.
- Multi-stage constant current charging can include N constant-current stages, where N is an integer not less than two. In the multi-stage constant current charging, a first stage charging begins with a pre-determined charging current. The N constant-current stages of the multi-stage constant current charging are executed in sequence from the first stage to an Nth stage. When a previous constant-current stage ends and a next constant-current stage begins, the peak value or average value of the pulsating waveform may decrease. When voltage of the battery reaches a threshold value of charging cut-off voltage, the previous constant-current stage ends and the next constant-current stage begins. A current conversion process between two adjacent constant-current stages may be a gradual process or in a step-like manner.
- In addition, in case that the current output by the power supply device is a pulsating DC current, the constant-current mode can refer to a charging mode of controlling a peak value or an average value of the pulsating DC current, that is, controlling the peak value of the current output by the power supply device not greater than current corresponding to the constant-current mode. Furthermore, in case that the current output by the power supply device is an alternating current (AC) current, the constant-current mode can refer to a charging mode of controlling a peak value of the AC current.
- In addition, it should be noted that, in the implementations of the present disclosure, the device to be charged can be a terminal. The “terminal” can include but is not limited to a device configured via a wired line and/or a wireless interface to receive/transmit communication signals. Examples of the wired line may include, but are not limited to, at least one of a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct connection cable, and/or other data connection lines or network connection lines. Examples of the wireless interface may include, but are not limited to, a wireless interface with a cellular network, a wireless local area network (WLAN), a digital television network (such as a digital video broadcasting-handheld (DVB-H) network), a satellite network, an AM-FM broadcast transmitter, and/or with other communication terminals. A communication terminal configured to communicate via a wireless interface may be called a “wireless communication terminal”, a “wireless terminal”, and/or a “mobile terminal”. Examples of a mobile terminal may include, but are not limited to, a satellite or cellular telephone, a personal communication system (PCS) terminal capable of cellular radio telephone, data processing, fax, and/or data communication, a personal digital assistant (PDA) equipped with radio telephone, pager, Internet/Intranet access, web browsing, notebook, calendar, and/or global positioning system (GPS) receiver, and/or other electronic devices equipped with radio telephone capability such as a conventional laptop or a handheld receiver. In addition, in the implementations of the present disclosure, the device to be charged or terminal can also include a power bank. The power bank can be charged by the power supply device and thus store the energy to charge other electronic devices.
- In addition, in the implementations of the present disclosure, when a pulsating waveform voltage output by the power supply device is applied directly to a battery of the device to be charged to charge the battery, charging current can be represented in the form of a pulsating wave (such as a steamed bun wave). It can be understood that, the charging current can charge the battery in an intermittent manner. Period of the charging current can vary with frequency of an input AC such as an AC power grid. For instance, frequency corresponding to the period of the charging current is N times (N is a positive integer) or N times the reciprocal of frequency of a power grid. Additionally, when the charging current charges the battery in an intermittent manner, current waveform corresponding to the charging current can include one pulsation or one group of pulsations synchronized with the power grid.
- As an implementation, in the implementations of the present disclosure, when the battery is charged (such as in at least one of the trickle charging stage, the constant-current charging stage, and the constant-voltage charging stage), the battery can receive a pulsating DC (direction remains constant, and magnitude varies with time), an AC (both direction and magnitude vary with time), or a DC (that is, a constant DC, neither magnitude nor direction varies with time) output by the power supply device.
- As to a conventional device to be charged, the device to be charged usually has only one single cell. When the single cell is charged with large charging current, heating of the device to be charged is serious. In order to guarantee charging speed and reduce heating of the device to be charged, structure of the cell of the device to be charged is modified in the implementation of the present disclosure. A battery with cells coupled in series, together with a battery management circuit that is able to conduct direct charging on the battery with cells coupled in series, is provided. Since, to achieve equal charging speed, charging current of the battery with cells coupled in series is 1/N time the magnitude of charging current of the battery with one single cell, where N represents the number of cells coupled in series of the device to be charged. For the equal charging speed, the battery management circuit of the implementation of the present disclosure acquires smaller charging current from an external power supply device, thereby reducing heating in the charging process. The following will describe the implementation of the disclosure in detail in conjunction with
FIG. 1 . -
FIG. 1 is a schematic structural diagram illustrating a charging system according to an implementation of the present disclosure. The charging system includes apower supply device 10, abattery management circuit 20, and abattery 30. Thebattery management circuit 20 can be configured to manage thebattery 30. As an implementation, thebattery management circuit 20 can be configured to manage a charging process of thebattery 30, such as selecting a charging channel, controlling charging voltage and/or charging current, and so on. As another implementation, thebattery management circuit 20 can be configured to manage cells of thebattery 30, such as balancing voltage between the cells of thebattery 30. - The
battery management circuit 20 can include afirst charging channel 21 and acommunication circuit 23. - Through the
first charging channel 21, charging voltage and/or charging current can be received from thepower supply device 10 and applied to thebattery 30 for charging. - In other words, through the
first charging channel 21, direct charging can be conducted on thebattery 30 by applying directly the charging voltage and/or charging current received from thepower supply device 10 to thebattery 30. “Direct charging” is elaborated in the whole disclosure and will not be repeated herein. Thefirst charging channel 21 can be referred to as a direct charging channel. The direst charging channel does not need to be provided with a conversion circuit such as a charging IC. That is to say, unlike a conventional charging channel, through the direct charging channel, the charging voltage and/or charging current received from the power supply device do not need to be converted and then applied to the battery. Instead, through the direct charging channel, the charging voltage and/or charging current received from the power supply device can be applied directly to the battery. - The
first charging channel 21 can be, for example, a wire. Optionally, thefirst charging channel 21 can be provided with other circuit components unrelated to charging voltage and/or charging current conversion. For instance, thebattery management circuit 20 includes thefirst charging channel 21 and a second charging channel. Thefirst charging channel 21 can be provided with a switch component configured to switch between charging channels, which will be described in detail inFIG. 10 . - The
power supply device 10 can be the power supply device with adjustable output voltage mentioned above. However, the types of thepower supply device 10 are not limited herein. For example, thepower supply device 10 can be a device specially configured to charge such as an adaptor, a power bank, etc., or other devices that are able to provide both power and data service such as a computer. - The
battery 30 according the implementations of the present disclosure can include multiple cells coupled in series (at least two cells). The cells coupled in series can be configured to divide the charging voltage provided by thepower supply device 10 in the charging process. As illustrated inFIG. 1 , afirst cell 31 a and asecond cell 31 b can be any two of the multiple cells or any two groups of the multiple cells. Exemplarily, when thefirst cell 31 a (or thesecond cell 31 b) includes a group of cells, all cells in this cell-group can be coupled in series or in parallel. The coupling manners of the cells are not limited herein. - The
battery 30 can be one battery or multiple batteries. That is to say, the cells coupled in series according to the implementations of the present disclosure can be packaged into one battery pack to form one battery or be packaged into multiple battery packs to form multiple batteries. For instance, thebattery 30 can be one battery. The one battery includes thefirst cell 31 a and thesecond cell 31 b coupled in series. For another instance, thebattery 30 can include two batteries. One of the two batteries includes thefirst cell 31 a, and the other one of the two batteries includes thesecond cell 31 b. - When the
power supply device 10 charges thebattery 30 through thefirst charging channel 21, thecommunication circuit 23 can be configured to communicate with thepower supply device 10, so as to make magnitude of the charging voltage and/or charging current received from thepower supply device 10 match a present charging stage of thebattery 30, or make magnitude of the charging voltage and/or charging current received from thepower supply device 10 meet requirements on the charging voltage and/or charging current in the present charging stage of thebattery 30. - As mentioned above, the
first charging channel 21 is a direct charging channel, through which the charging voltage and/or charging current received from thepower supply device 10 can be applied directly to thebattery 30. In order to achieve direct charging, the implementations of the present disclosure introduce in the battery management circuit 20 a control circuit with a communication function, that is, thecommunication circuit 23. Thecommunication circuit 23 can be configured to keep communicating with thepower supply device 10 in a direct charging process to form a closed-loop feedback mechanism, so as to enable thepower supply device 10 to acquire the state information of the battery in real time, thus adjusting continuously the charging voltage and/or charging current flowing into the first charging channel to guarantee that magnitude of the charging voltage and/or charging current received from thepower supply device 10 matches the present charging stage of thebattery 30. - The present charging stage of the
battery 30 can be any one of the trickle charging stage, the constant-current charging stage, and the constant-voltage charging stage. - In the trickle charging stage of the
battery 30, thecommunication circuit 23 can be configured to communicate with thepower supply device 10, so that thepower supply device 10 can adjust charging current provided for thefirst charging channel 21, to make the charging current match charging current corresponding to the trickle charging stage, or make the charging current to meet requirements on charging current in the trickle charging stage of thebattery 30. - In the constant-voltage charging stage of the
battery 30, thecommunication circuit 23 can be configured to communicate with thepower supply device 10, so that thepower supply device 10 can adjust charging voltage provided for thefirst charging channel 21, to make the charging voltage match charging voltage corresponding to the constant-voltage charging stage, or make the charging voltage meet requirements on charging voltage in the constant-voltage charging stage of thebattery 30. - In the constant-current charging stage of the
battery 30, thecommunication circuit 23 can be configured to communicate with thepower supply device 10, so that thepower supply device 10 can adjust charging current provided for thefirst charging channel 21, to make the charging current match charging current corresponding to the constant-current charging stage, or make the charging current meet requirements on charging current in the constant-current charging stage of thebattery 30. - In implementations of the present disclosure, content communicated and communication methods between the
communication circuit 23 and thepower supply device 10 are not limited. The above aspects will be described in detail hereinafter in conjunction with specific implementations and will not be repeated herein. - The
battery management circuit 20 can further include abalancing circuit 22. The balancingcircuit 22 can be coupled with thefirst cell 31 a and thesecond cell 31 b to balance the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b. - The
battery management circuit 20 according to the implementations of the present disclosure can be configured to conduct direct charging on the battery. In other words, thebattery management circuit 20 according to the implementation of the present disclosure is a battery management circuit that supports a direct charging architecture. In the direct charging architecture, the direct charging channel does not need to be provided with a conversion circuit, which in turn reduces heating of the device to be charged in the charging process. - Direct charging scheme can reduce heating of the device to be charged in the charging process to some extent. However, when charging current received from the
power supply device 10 is excessive, such as an output current of thepower supply device 10 reaching a magnitude between 5 A and 10 A, heating of thebattery management circuit 20 is still serious, and thus safety problems may occur. - In order to guarantee charging speed and further reduce heating of the device to be charged in the charging process, structure of the battery is modified in the implementations of the present disclosure. A battery with cells coupled in series is provided. Compared with a battery with one single cell, to achieve an equal charging speed, charging current of the battery with cells coupled in series is 1/N time the magnitude of charging current of a battery with one single cell, where N represents the number of cells coupled in series of the device to be charged. That is to say, as to an equal charging speed, the implementations of the present disclosure can substantially reduce magnitude of charging current, thereby further reducing heating of the device to be charged in the charging process.
- For example, as to a single-cell battery of 3000 mAh, a charging current of 9 A (ampere) is needed to reach a charging speed of 3 C (Coulomb). In order to reach an equal charging speed and reduce heating of the device to be charged in the charging process at the same time, two cells, each of 1500 mAh, can be coupled in series to replace the single cell of 3000 mAh. As a result, only a charging current of 4.5 A is needed to reach the charging speed of 3 C. In addition, compared with the charging current of 9 A, the charging current of 4.5 A produces substantially less heat than the charging current of 9 A.
- In addition, the power management circuit in the implementations of the present disclosure can be configured to balance voltage between cells coupled in series and make parameters of the cells coupled in series be approximate, so as to facilitate unified management of cells of the battery. Furthermore, in case that the battery includes multiple cells, keeping parameters between the cells consistent can improve overall performance and service life of the battery.
- It should be noted that, since a direct charging manner is adopted to charge the
battery 30 with multiple cells coupled in series through thefirst charging channel 21, charging voltage received from thepower supply device 10 needs to be higher than total voltage of thebattery 30. In general, working voltage of a single cell is between 3.0V and 4.35V. In case of double cells coupled in series, when thefirst charging channel 21 is adopted in the charging process, output voltage of thepower supply device 10 can be set equal to or higher than 10V. - The balancing
circuit 22 can be implemented in various manners. The implementations of the disclosure provide a balancing circuit based on an RLC series circuit. The following will describe in detail the balancing circuit based on an RLC series circuit in conjunction withFIG. 2 toFIG. 9 . - As illustrated in
FIG. 2 , the balancingcircuit 22 includes anRLC series circuit 25, aswitch circuit 26, and acontrol circuit 27. Theswitch circuit 26 has one end coupled with thefirst cell 31 a and thesecond cell 31 b and another end coupled with theRLC series circuit 25. Theswitch circuit 26 has a control end coupled with thecontrol circuit 27. - The
control circuit 27 is configured to control theswitch circuit 26 to make thefirst cell 31 a and thesecond cell 31 b alternately form a closed loop with theRLC series circuit 25 to provide input voltage for theRLC series circuit 25, when the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b are unbalanced. In other words, thecontrol circuit 27 can be configured to control theswitch circuit 26 to make thefirst cell 31 a and thesecond cell 31 b alternately be a voltage source of theRLC series circuit 25 to provide input voltage for theRLC series circuit 25. - When the
control circuit 27 couples alternately thefirst cell 31 a and thesecond cell 31 b with theRLC series circuit 25 via theswitch circuit 26, an equivalent circuit diagram ofFIG. 3 can be obtained. As illustrated inFIG. 3 , VG1 represents an equivalent power supply of theRLC series circuit 25 formed by thefirst cell 31 a and thesecond cell 31 b being alternately coupled with theRLC series circuit 25. For example, the voltage of thefirst cell 31 a is 4.3V and the voltage of thesecond cell 31 b is 4.2V. A voltage waveform of VG1 is illustrated inFIG. 4 . The input voltage can be divided into a DC component of a 4.25V voltage and an AC component of a 4.25V voltage. Vpp of the AC component (difference between a minimum value of the AC component and a maximum value of the AC component) is 0.5V. - Still take the voltage of the
first cell 31 a being 4.3V and the voltage of thesecond cell 31 b being 4.2V as an example.FIG. 5 is a diagram illustrating correspondence between a waveform of Current I in theRLC series circuit 25 and a voltage waveform of VG1 of the RLC series circuit. It should be understood that, the specific value of I depends on overall impedance of theRLC series circuit 25 and is not limited herein. - When the voltage of VG1 is 4.3V, it means that the
first cell 31 a is coupled with theRLC series circuit 25; when input voltage of VG1 is 4.2V it means that thesecond cell 31 b is coupled with theRLC series circuit 25. By comparing the waveform of Current I in theRLC series circuit 25 and the voltage waveform of VG1 of theRLC series circuit 25, it can be seen that when thesecond cell 31 b is coupled with theRLC series circuit 25, current in theRLC series circuit 25 is a negative current, that is, the current flows from the outside to thesecond cell 31 b to charge thesecond cell 31 b, so as to balance the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b. - The balancing circuit in the implementations of the disclosure is a balancing circuit based on an RLC series circuit. The balancing circuit has a simple circuit structure and is able to reduce complexity of a battery management circuit. In addition, the number of components of the RLC series circuit is small and total impedance of the RLC series circuit is low. Therefore, heating is low during working of the balancing circuit.
- As pointed above, when the
control circuit 27 couples alternately thefirst cell 31 a and thesecond cell 31 b with theRLC series circuit 25, the waveform of the current I in theRLC series circuit 25 is illustrated inFIG. 5 . When the impedance of theRLC series circuit 25 is excessively high, magnitude of the current I is low, and a balancing process between the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b is slow. - The
RLC series circuit 25 has a resonant characteristic. The magnitude of the current I in theRLC series circuit 25 depends on voltage frequency of VG1 (that is, the frequency of the input voltage of the RLC series circuit 25). The more the voltage frequency of VG1 approximates to resonant frequency of theRLC series circuit 25, the higher the current in theRLC series circuit 25 is. - Therefore, in order to improve efficiency in energy transfer of the balancing circuit, the
control circuit 27 can control theswitch circuit 26, to make frequency of the input voltage of theRLC series circuit 25 approximate to the resonant frequency of theRLC series circuit 25, which can substantially improve efficiency in energy transfer between thefirst cell 31 a and thesecond cell 31 b. When the frequency of the input voltage of theRLC series circuit 25 reaches the resonant frequency of theRLC series circuit 25, that is, the frequency of the input voltage of theRLC series circuit 25 reaches f=1/π√{square root over (LC)}, where L represents self-inductance coefficient of Inductor L and C represents capacitance of Capacitor C, theRLC series circuit 25 goes into a resonant state. When theRLC series circuit 25 is in a resonant state, Inductor L and Capacitor C have voltages which are equal in magnitude and opposite in phase, and thus the voltages can cancel each other out, which makes Inductor L and Capacitor C form a short circuit (Inductor L and Capacitor C are equivalent to a wire). TheRLC series circuit 25 becomes a pure resistance circuit, magnitude of the current I in theRLC series circuit 25 reaches a maximum value, and efficiency in energy transfer in the balancingcircuit 22 reaches the highest level. - The configuration of the
switch circuit 26 is not limited herein, as long as thefirst cell 31 a and thesecond cell 31 b can be alternately coupled with theRLC series circuit 25 through on-off of a switch component(s) of theswitch circuit 26. The following will provide several alternative implementations of theswitch circuit 26. -
FIG. 6 illustrates an alternative implementation of the switch circuit. As illustrated inFIG. 6 , the switch circuit includes a first switch transistor Q1, a second switch transistor Q2, a third switch transistor Q3, and a fourth switch transistor Q4. The first switch transistor Q1 has a firstconnected end 60 coupled with a positive electrode of thefirst cell 31 a and a secondconnected end 61 coupled with a firstconnected end 63 of the second switch transistor Q2. The second switch transistor Q2 has a secondconnected end 64 coupled with a firstconnected end 66 of the third switch transistor Q3 and a negative electrode of thefirst cell 31 a. The third switch transistor Q3 has a secondconnected end 67 coupled with a firstconnected end 69 of the fourth switch transistor Q4. The fourth switch transistor Q4 has a secondconnected end 70 coupled with a negative electrode of thesecond cell 31 b. Thesecond cell 31 b has a positive electrode coupled with a negative electrode of thefirst cell 31 a. The first switch transistor Q1 has acontrol end 62 coupled with thecontrol circuit 27. The second switch transistor Q2 has acontrol end 65 coupled with thecontrol circuit 27. The third switch transistor Q3 has acontrol end 68 coupled with thecontrol circuit 27. The fourth switch transistor Q4 has acontrol end 71 coupled with thecontrol circuit 27. Components of the RLC series circuit (including a capacitor C, an inductor L, and a resistor R illustrated inFIG. 6 ) are coupled in series between the secondconnected end 61 of the first switch transistor Q1 and the secondconnected end 67 of the third switch transistor Q3. -
FIG. 7 illustrates another alternative implementation of the switch circuit. As illustrated inFIG. 7 , the switch circuit includes a first switch transistor Q1, a second switch transistor Q2, a third switch transistor Q3, and a fourth switch transistor Q4. The first switch transistor Q1 has a firstconnected end 60 coupled with a positive electrode of thefirst cell 31 a and a secondconnected end 61 coupled with a firstconnected end 63 of the second switch transistor Q2. The second switch transistor Q2 has a secondconnected end 64 coupled with a firstconnected end 66 of the third switch transistor Q3. The third switch transistor Q3 has a secondconnected end 67 coupled with a firstconnected end 69 of the fourth switch transistor Q4. The fourth switch transistor Q4 has a secondconnected end 70 coupled with a negative electrode of thesecond cell 31 b. Thesecond cell 31 b has a positive electrode coupled with a negative electrode of thefirst cell 31 a. The first switch transistor Q1 has acontrol end 62 coupled with thecontrol circuit 27. The second switch transistor Q2 has acontrol end 65 coupled with thecontrol circuit 27. The third switch transistor Q3 has acontrol end 68 coupled with thecontrol circuit 27. The fourth switch transistor Q4 has acontrol end 71 coupled with thecontrol circuit 27. At least part of components of the RLC series circuit are coupled in series between the secondconnected end 64 of the second switch transistor Q2 and the negative electrode of thefirst cell 31 a, and components of the RLC series circuit, other than the above mentioned at least part of components of the RLC series circuit coupled in series between the secondconnected end 64 of the second switch transistor Q2 and the negative electrode of thefirst cell 31 a, are coupled in series between the secondconnected end 61 of the first switch transistor Q1 and the secondconnected end 67 of the third switch transistor Q3. - The at least part of components of the RLC series circuit mentioned above can be at least one of Capacitor C, Inductor L, and Resistor R. For instance, the at least part of components of the RLC series circuit mentioned above can be Inductor L, and the components other than the at least part of components of the RLC series circuit, can be Capacitor C and Resistor R. For another instance, the at least part of components of the RLC series circuit mentioned above can be Inductor L and Capacitor C, and the components of the RLC series circuit, other than the at least part of components of the RLC series circuit, can be Resistor R. For yet another instance, the at least part of components of the RLC series circuit mentioned above can be Resistor R, Capacitor C, and Inductor L, and there is no other component except the at least part of components of the RLC series circuit. In this case, the second
connected end 61 of the first switch transistor Q1 can be coupled with the secondconnected end 67 of the third switch transistor Q3 directly through wires. - The switch transistor mentioned above can be, for example, a MOS (metal oxide semiconductor) transistor. In addition, the connected end of the switch transistor mentioned above can be a source electrode and/or a drain electrode of the switch transistor. The control end of the switch transistor can be a grid electrode of the switch transistor.
- Based on the balancing circuit illustrated in
FIG. 6 andFIG. 7 , the following will describe alternative control manners of thecontrol circuit 27. -
FIG. 8 is a flowchart illustrating a control method according to an implementation of the present disclosure.FIG. 8 describes a situation where the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b are unbalanced and the voltage of thefirst cell 31 a is higher than the voltage of thesecond cell 31 b. The control method illustrated inFIG. 8 includes operations atblock 810 to block 840. The following will describe the method in detail. - At
block 810, control the first switch transistor Q1 and the third switch transistor Q3 to an on-state from time t0 to time t1 and control the second switch transistor Q2 and the fourth switch transistor Q4 to an off-state from time t0 to time t1, where time t0 represents a start time of a work period of the control circuit 27 (that is,time 0 of the work period). - It can be seen from
FIG. 6 orFIG. 7 that, when the first switch transistor Q1 and the third switch transistor Q3 are in the on-state and the second switch transistor Q2 and the fourth switch transistor Q4 are in the off-state, thefirst cell 31 a, the capacitor C, the inductor L, and the resistor R form a closed circuit, and thefirst cell 31 a provides input voltage for the RLC series circuit. - At
block 820, control the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, and the fourth switch transistor Q4 to the off-state from time t1 to time t2, where a time period from time t1 to time t2 represents a preset first dead time. - A dead time can be understood as a protection time, which aims to avoid the first switch transistor Q1 and the third switch transistor Q3 being simultaneously in the on-state with the second switch transistor Q2 and the fourth switch transistor Q4 and thus resulting in circuit fault.
- At
block 830, control the second switch transistor Q2 and the fourth switch transistor Q4 to the on-state from time t2 to time t3 and control the first switch transistor Q1 and the third switch transistor Q3 to the off-state from time t2 to time t3. - It can be seen from
FIG. 6 orFIG. 7 that, when the second switch transistor Q2 and the fourth switch transistor Q4 are in the on-state and the first switch transistor Q1 and the third switch transistor Q3 are in the off-state, thesecond cell 31 b, Capacitor C, Inductor L, and Resistor R form a closed circuit, and thesecond cell 31 b provides input voltage for the RLC series circuit. - In some implementations, value of t3-t2 can be equal to value of t1-t0, that is, a time period of the second switch transistor Q2 and the fourth switch transistor Q4 being in the on-state can be equal to a time period of the first switch transistor Q1 and the third switch transistor Q3 being in the on-state.
- At
block 840, control the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, and the fourth switch transistor Q4 to the off-state from time t3 to time t4, where t4 represents an end time of the work period and a time period from time t3 to time t4 represents a preset second dead time. - In some implementations, the second dead time can be equal to the first dead time.
- In addition, in some implementations, by setting reasonably value of t1-t4, work frequency of the
control circuit 27 can be made to be equal to the resonant frequency of the RLC series circuit, which can make frequency of the input voltage of the RLC series circuit be equal to the resonant frequency of the RLC series circuit, thereby prompting the RLC series circuit to reach the resonant state. - It should be understood that,
FIG. 8 illustrates a control time sequence of thecontrol circuit 27 in any work period. Control time sequences of other work periods are similar and will not be repeated herein. -
FIG. 9 is a flowchart illustrating a control method according to another implementation of the present disclosure.FIG. 9 describes a situation where the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b are unbalanced and the voltage of thesecond cell 31 b is higher than the voltage of thefirst cell 31 a. The control method ofFIG. 9 is similar to that ofFIG. 8 , and the difference lies in that inFIG. 9 , the on and off order of the first switch transistor Q1 and the third switch transistor Q3 are exchanged with that of the second switch transistor Q2 and the fourth switch transistor Q4. The control method illustrated inFIG. 9 includes operations atblock 910 to block 940. The following will describe the method in detail. - At
block 910, control the second switch transistor Q2 and the fourth switch transistor Q4 to an on-state from time t0 to time t1 and control the first switch transistor Q1 and the third switch transistor Q3 to an off-state from time t0 to time t1, where time t0 represents a start time of a work period of thecontrol circuit 27. - It can be seen from
FIG. 6 orFIG. 7 that, when the second switch transistor Q2 and the fourth switch transistor Q4 are in the on-state and the first switch transistor Q1 and the third switch transistor Q3 are in the off-state, thesecond cell 31 b, the capacitor C, the inductor L, and the resistor R form a closed circuit, and thesecond cell 31 b provides input voltage for the RLC series circuit. - At
block 920, control the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, and the fourth switch transistor Q4 to the off-state from time t1 to time t2, where a time period from time t1 to time t2 represents a preset first dead time. - At
block 930, control the first switch transistor Q1 and the third switch transistor Q3 to the on-state from time t2 to time t3 and control the second switch transistor Q2 and the fourth switch transistor Q4 to the off-state from time t2 to time t3. - It can be seen from to
FIG. 6 orFIG. 7 that, when the first switch transistor Q1 and the third switch transistor Q3 are in the on-state and the second switch transistor Q2 and the fourth switch transistor Q4 are in the off-state, thefirst cell 31 a, Capacitor C, Inductor L, and Resistor R form a closed circuit, and thefirst cell 31 a provides input voltage for the RLC series circuit. - In some implementations, value of t3-t2 can be equal to value of t1-t0, that is, a time period of the second switch transistor Q2 and the fourth switch transistor Q4 being in the on-state can be equal to a time period of the first switch transistor Q1 and the third switch transistor Q3 being in the on-state.
- At
block 940, control the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, and the fourth switch transistor Q4 to the off-state from time t3 to time t4, where t4 represents an end time of the work period and a time period from time t3 to time t4 represents a preset second dead time. - In some implementations, the second dead time can be equal to the first dead time.
- In addition, in some implementations, by setting reasonably value of t1-t4, work frequency of the
control circuit 27 can be made to be equal to the resonant frequency of the RLC series circuit, which can make frequency of the input voltage of the RLC series circuit be equal to the resonant frequency of the RLC series circuit, thereby prompting the RLC series circuit to reach the resonant state. - It should be understood that,
FIG. 9 illustrates a control time sequence of thecontrol circuit 27 in any work period. Control time sequences of other work periods are similar and will not be repeated herein. - Optionally, in some implementations, as illustrated in
FIG. 10 , thebattery management circuit 20 can further include asecond charging channel 24. Thesecond charging channel 24 is provided with aboost circuit 25. When thepower supply device 10 charges thebattery 30 through thesecond charging channel 24, theboost circuit 25 is configured to receive initial voltage from thepower supply device 10 and increase the initial voltage to a target voltage to charge thebattery 30 according to the target voltage. The initial voltage is lower than total voltage of thebattery 30 and the target voltage is higher than the total voltage of thebattery 30. In addition, as illustrated inFIG. 10 , in some implementations, thebattery management circuit 20 can further include asecond control circuit 28. Thesecond control circuit 28 can be configured to control switching between thefirst charging channel 21 and thesecond charging channel 24. - It can be understood from above that, through the
first charging channel 21, direct charging is conducted on cells of thebattery 30, and direct charging requires that charging voltage received from thepower supply device 10 be higher than total voltage of cells coupled in series of the battery. For example, as to two cells coupled in series, suppose present voltage of each cell is 4V, when the two cells are charged through thefirst charging channel 21, the charging voltage received from thepower supply device 10 is required to be at least higher than 8V. However, output voltage of a conventional power supply device is usually unable to reach 8V (for example, a conventional adaptor usually provides an output voltage of 5V), which results in the conventional power supply device being unable to charge thebattery 30 through thefirst charging channel 21. In order to make the above direct charging circuit be compatible with the conventional power supply device, such as a conventional power adaptor, thesecond charging channel 24 is provided herein. Thesecond charging channel 24 is provided with aboost circuit 25, and theboost circuit 25 is configured to increase the initial voltage provided by thepower supply device 10 to a target voltage to make the target voltage be higher than the total voltage of thebattery 30, so as to solve the problem of the conventional power supply device being unable to charge thebattery 30 with multiple cells coupled in series according to the implementations of the disclosure. - The configuration of the
boost circuit 25 is not limited herein. For instance, a Boost circuit or a charge pump can be adopted to increase voltage. Optionally, in some implementations, thesecond charging channel 24 can adopt a conventional charging channel design, that is, thesecond charging channel 24 can be provided with a conversion circuit, such as a charging IC. The conversion circuit can take constant-voltage and constant-current control of the charging process of thebattery 30 and adjust (such as boost or buck) the initial voltage received from thepower supply device 10 according to actual needs. In the implementations of the disclosure, the initial voltage received from thepower supply device 10 can be increased to the target voltage by utilizing a boost function of the conversion circuit. - The
communication circuit 23 can achieve switching between thefirst charging channel 21 and thesecond charging channel 24 through a switch component. Specifically, as illustrated inFIG. 10 , thefirst charging channel 21 is provided with a switch transistor Q5. When thecommunication circuit 23 controls the switch transistor Q5 to switch-on, thefirst charging channel 21 works and direct charging is conducted on thebattery 30 through thefirst charging channel 21. When thecommunication circuit 23 controls the switch transistor Q5 to switch-off, thesecond charging channel 24 works and charging is conducted on thebattery 30 through thesecond charging channel 24. - In implementations of the disclosure, a device to be charged is provided. As illustrated in
FIG. 11 , the device to be charged 40 can include thebattery management circuit 20 and thebattery 30 described above. - At present, a single-cell power supply scheme is generally adopted for charging in a device to be charged (such as a terminal). Multiple cells coupled in series are proposed in implementations of the disclosure. Total voltage of the multiple cells is high and is therefore unsuitable to be used directly to supply power to the device to be charged. In order to solve this problem, a practical scheme is to adjust working voltage of the system of the device to be charged, so as to enable the system of the device to be charged to support power supply of multiple cells at the same time. However, this scheme results in too many modifications to the device to be charged and high cost.
- Optionally, in some implementations, the device to be charged 40 can be provided with a buck circuit, so as to make decreased voltage meet requirements of the device to be charged 40 on power supply voltage.
- For example, working voltage of a single cell is 3.0V to 4.35V. In order to guarantee normal power supply voltage of the system of the device to be charged, the buck circuit can be configured to decrease the total voltage of the
battery 30 to a value between 3.0V and 4.35V. The buck circuit can be implemented in various manners, such as a Buck circuit, a charge pump, etc., to decrease voltage. - Optionally, in other implementations, a power supply circuit of the device to be charged 40 has an input end that can be coupled with both ends of any one single cell of the
battery 30. The power supply circuit can supply power to the system of the device to be charged 40 according to voltage of the one single cell. - It should be understood that, voltage decreased by the buck circuit may have ripples and in turn influence power supply quality of the device to be charged. The implementations of the disclosure still adopt one single cell to supply power to the system of the device to be charged, due to steady voltage output by one single cell. Therefore, in the implementations of the disclosure, while a problem of how to supply power based on a multiple-cell scheme is solved, power supply quality of the system of the device to be charged can be guaranteed.
- When one single cell is adopted to supply power, imbalance of voltage between different cells of the
battery 30 may occur. The imbalance of voltage between different cells can cause difficulty in battery management. In addition, difference in parameters of cells of the battery can result in decrease in service life of the battery. In the implementation of the disclosure, the balancingcircuit 22 is used to balance voltage between cells, thereby keeping voltage between the cells of thebattery 30 balanced even if the above single-cell power supply scheme is adopted. - With output power of the power supply device increasing, when the power supply device charges the cells of the device to be charged, lithium precipitation may occur, which deceases service life of the cells.
- In order to improve reliability and safety of the cells, in some implementations, the
power supply device 10 can be controlled to output a pulsating DC current (also referred to as a one-way pulsating output current, a pulsating waveform current, or a steamed bun-wave current). Since the direct charging manner is adopted to charge thebattery 30 through thefirst charging channel 21, the pulsating DC current received from thepower supply device 10 can be applied directly to thebattery 30. As illustrated inFIG. 12 , magnitude of the pulsating DC current varies periodically. Compared with a constant DC current, the pulsating DC current can reduce lithium precipitation of a cell, thereby increasing service life of the cell. In addition, compared with the constant DC current, the pulsating DC current can decrease possibility and intensity in arcing of a contact of a charging interface, thereby increasing service life of the charging interface. - Adjusting charging current output by the
power supply device 10 to the pulsating DC current can be achieved in various manners. For example, a primary filtering circuit and a secondary filtering circuit of thepower supply device 10 can be removed, so as to make thepower supply device 10 output the pulsating DC current. - Optionally, in some implementations, the charging current received from the
power supply device 10 by thefirst charging channel 21 can be an AC current, for example, a primary filtering circuit, a secondary rectifying circuit, and a secondary filtering circuit of thepower supply device 10 can be removed to make thepower supply device 10 output the AC current. The AC current can also reduce lithium precipitation of the cell and increase the service life of the cell. - Optionally, in some implementations, the
power supply device 10 is selectively operable in a first charging mode or a second charging mode. Charging speed of thepower supply device 10 charging thebattery 30 in the second charging mode is faster than that of thepower supply device 10 charging thebattery 30 in the first charging mode. In other words, compared with thepower supply device 10 working in the first charging mode, thepower supply device 10 working in the second charging mode takes less time to charge battery of the same capacity. In addition, in some implementations, in the first charging mode, thepower supply device 10 charges thebattery 30 through thesecond charging channel 24; in the second charging mode, thepower supply device 10 charges thebattery 30 through thefirst charging channel 21. - The first charging mode can be a normal charging mode. The second charging mode can be a quick charging mode. In the normal charging mode, the power supply device outputs smaller current (usually smaller than 2.5 A) or adopts low power (usually lower than 15 W) to charge the battery of the device to be charged. In the normal charging mode, charging fully a battery of high capacity (such as a 3000 mA battery) usually takes several hours. However, in the quick charging mode, the power supply device can output larger current (usually larger than 2.5 A, such as 4.5 A, 5 A, or even larger) or adopt higher power (usually higher than or equal to 15 W) to charge the battery of the device to be charged. Compared with the normal charging mode, in the quick charging mode, the power supply device can charge fully the battery of the same capacity within a substantially shorter charging period and at a higher charging speed.
- In addition, the
communication circuit 23 can be configured to conduct two-way communication with thepower supply device 10, to control output of thepower supply device 10 in the second charging mode, that is, to control the charging voltage and/or charging current provided by thepower supply device 10 in the second charging mode. The device to be charged 40 can include a charging interface. Thecommunication circuit 23 is configured to communicate with thepower supply device 10 through a data line of the charging interface. For instance, the charging interface can be a USB interface. The data line can be a D+ line and/or a D− line of the USB interface. Optionally, the device to be charged 40 can be further configured to conduct wireless communication with thepower supply device 10. - Content communicated between the
power supply device 10 and thecommunication circuit 23 and control manners of thecommunication circuit 23 on output of thepower supply device 10 in the second charging mode are not limited herein. For example, thecommunication circuit 23 can be configured to communicate with thepower supply device 10, interact with present total voltage and/or present power of thebattery 30 of the device to be charged 40, and adjust output voltage and/or output current of thepower supply device 10 according to the present total voltage and/or present power of thebattery 30. The following will describe in detail the content communicated between thecommunication circuit 23 and thepower supply device 10 and the control manners of thecommunication circuit 23 on output of thepower supply device 10 in the second charging mode in conjunction with specific implementations of the disclosure. - Description above does not limit master-slave relationship between the
power supply device 10 and the device to be charged (or thecommunication circuit 23 of the device to be charged). That is to say, any one of thepower supply device 10 and the device to be charged can function as a master device to initiate a two-way communication, and correspondingly the other one of thepower supply device 10 and the device to be charged can function as a slave device to make a first response or a first reply to the communication initiated by the master device. As a practical manner, identities of the master device and the slave device can be determined by comparing levels of thepower supply device 10 and the device to be charged with reference to earth in a communication process. - The implementation of the two-way communication between the
power supply device 10 and the device to be charged is not limited herein. In other words, any one of thepower supply device 10 and the device to be charged can function as the master device to initiate the communication, and correspondingly the other one of thepower supply device 10 and the device to be charged can function as the slave device to make the first response or the first reply to the communication initiated by the master device. Besides, the master device can make a second response to the first response or the first reply of the slave device, as such, the master device and the slave device complete a negotiation on charging modes. As a possible implementation, charging between the master device and the slave device can be executed after completion of multiple negotiations on charging modes between the master device and the slave device, so as to guarantee that the charging process is safe and reliable after negotiations. - The master device can make the second response to the first response or the first reply to the communication of the slave device as follows. The master device receives from the slave device the first response or the first reply to the communication and makes the second response to the first response or the first reply of the slave device. As an example, when the master device receives from the slave device the first response or the first reply to the communication within a preset time period, the master device makes the second response to the first response or the first reply of the slave device as follows. The master device and the slave device complete a negotiation on charging modes. Charging between the master device and the slave device is executed in the first charging mode or in the second charging mode according to the negotiation result, that is, the
power supply device 10 is operable in the first charging mode or in the second charging mode to charge the device to be charged according to the negotiation. - The master device can also make the second response to the first response or the first reply to the communication of the slave device as follows. When the master device fails to receive from the slave device the first response or the first reply to the communication within a preset time period, the master device can still make the second response to the first response or the first reply made by the slave device. As an example, when the master device fails to receive from the slave device the first response or the first reply to the communication within a preset time period, the master device can still make the second response to the first response or the first reply made by the slave device as follows: the master device and the slave device complete a negotiation on charging modes. Charging is executed in the first charging mode between the master device and the slave device, that is, the power supply device is operable in the first charging mode to charge the device to be charged.
- Optionally, in some implementations, after the device to be charged, as the main device, initiates the communication and the
power supply device 10, as the subordinate device, makes the first response or the first reply to the communication initiated by the main device, without the device to be charged making the second response to the first response or the first reply of thepower supply device 10, it can be regarded as the main device and the subordinate device completing a negotiation on charging modes, and thus thepower supply device 10 can determine to charge the device to be charged in the first charging mode or in the second charging mode according to the negotiation. - Optionally, in some implementations, the
communication circuit 23 conducts two-way communication with thepower supply device 10, so as to control output of thepower supply device 10 in the second charging mode as follows. Thecommunication circuit 23 conducts two-way communication with thepower supply device 10, so as to negotiate charging modes between thepower supply device 10 and the device to be charged. - Optionally, in some implementations, the
communication circuit 23 conducts two-way communication with thepower supply device 10 to negotiate charging modes between thepower supply device 10 and the device to be charged as follows. Thecommunication circuit 23 receives a first instruction from thepower supply device 10, the first instruction is for enquiring whether the device to be charged enable (in other words, switches on) the second charging mode; thecommunication circuit 23 sends a reply instruction of the first instruction to thepower supply 10, the reply instruction of the first instruction is for indicating whether the device to be charged agrees to enable the second charging mode; in case that the device to be charged agrees to enable the second charging mode, thecommunication circuit 23 controls thepower supply device 10 to charge thebattery 30 though thefirst charging channel 21. - Optionally, in some implementations, the
communication circuit 23 conducts two-way communication with thepower supply device 10 to control output of thepower supply device 10 in the second charging mode as follows. Thecommunication circuit 23 conducts two-way communication with thepower supply device 10, so as to determine charging voltage which is output by the power supply device in the second charging mode and used for charging the device to be charged. - Optionally, in some implementations, the
communication circuit 23 conducts two-way communication with thepower supply device 10, so as to determine charging voltage which is output by the power supply device in the second charging mode and used for charging the device to be charged as follows. Thecommunication circuit 23 receives a second instruction from thepower supply device 10, the second instruction is for enquiring whether the charging voltage output by thepower supply device 10 matches present total voltage of thebattery 30 of the device to be charged; thecommunication circuit 23 sends a reply instruction of the second instruction to thepower supply 10, the reply instruction of the second instruction is for indicating that the voltage output by thepower supply device 10 matches the present total voltage of thebattery 30 or does not match, that is, is at higher voltage levels, or is at lower voltage levels. Optionally, the second instruction can be for enquiring whether it is suitable to use present output-voltage of thepower supply device 10 as the charging voltage, which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged. The reply instruction of the second instruction is for indicating whether the present output-voltage of thepower supply device 10 is suitable or unsuitable, that is, at higher voltage levels or at lower voltage levels. The present output-voltage of thepower supply device 10 matching the present total voltage of thebattery 30, or the present output-voltage of thepower supply device 10 being suitable to be used as the charging voltage which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged can be understood as follows. The present output-voltage of thepower supply device 10 is slightly higher than the present total voltage of the battery, and the difference between the output-voltage of thepower supply device 10 and the present total voltage of the battery is within a preset range (usually at a level of several hundred millivolts (mV)). - Optionally, in some implementations, the
communication circuit 23 can conduct two-way communication with thepower supply device 10, so as to control output of thepower supply device 10 in the second charging mode as follows. Thecommunication circuit 23 conducts two-way communication with thepower supply device 10, so as to determine charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged. - Optionally, in some implementations, the
communication circuit 23 can conduct two-way communication with thepower supply device 10 to determine charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged as follows. Thecommunication circuit 23 receives a third instruction sent by thepower supply device 10, the third instruction is for enquiring a maximum charging current the device to be charged supports; thecommunication circuit 23 sends a reply instruction of the third instruction to thepower supply device 10, the reply instruction of the third instruction is for indicating the maximum charging current the device to be charged supports, so that thepower supply device 10 can determine the charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged, according to the maximum charging current the device to be charged supports. It should be understood that, thecommunication circuit 23 determining the charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged according to the maximum charging current the device to be charged supports can be implemented in various manners. For example, thepower supply device 10 can determine the maximum charging current the device to be charged supports as the charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged, or comprehensively take into account the maximum charging current the device to be charged supports and other factors such as current output capability of thepower supply device 10 itself to determine the charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged. - Optionally, in some implementations, the
communication circuit 23 conducts two-way communication with thepower supply device 10 to control output of thepower supply device 10 in the second charging mode as follows. Thecommunication circuit 23 conducts two-way communication with thepower supply device 10 to adjust output-current of thepower supply device 10 in the second charging mode. - Specifically, the
communication circuit 23 conducts two-way communication with thepower supply device 10 to adjust the output-current of thepower supply device 10 as follows. Thecommunication circuit 23 receives a fourth instruction from thepower supply device 10, the fourth instruction is for enquiring present total voltage of the battery; thecommunication circuit 23 sends a reply instruction of the fourth instruction to thepower supply device 10, the reply instruction of the fourth instruction is for indicating the present total voltage of the battery, so that thepower supply device 10 can adjust the output-current of thepower supply device 10 according to the present total voltage of the battery. - Optionally, in some implementations, the
communication circuit 23 conducts two-way communication with thepower supply device 10, so as to control output of thepower supply device 10 in the second charging mode as follows. Thecommunication circuit 23 conducts two-way communication with thepower supply device 10 to determine whether there is contact failure in a charging interface. - Specifically, the
communication circuit 23 can conduct two-way communication with thepower supply device 10 to determine whether there is contact failure in the charging interface as follows. Thecommunication circuit 23 receives a fourth instruction sent by thepower supply device 10, the fourth instruction is for enquiring present voltage of the battery of the device to be charged; thecommunication circuit 23 sends a reply instruction of the fourth instruction to thepower supply device 10, the reply instruction of the fourth instruction is for indicating the present voltage of the battery of the device to be charged, so that thepower supply device 10 can determine whether there is contact failure in the charging interface according to output voltage of thepower supply 10 and the present voltage of the battery of the device to be charged. For instance, in case that thepower supply device 10 determines that difference between the output voltage of thepower supply 10 and the present voltage of the battery of the device to be charged is greater than a preset voltage threshold value, it indicates that impedance, which is obtained by the difference (that is, the difference between the output voltage of thepower supply 10 and the present voltage of the battery of the device to be charged) divided by output-current of thepower supply device 10, is greater than a preset impedance threshold value, it can be determined that there is contact failure in the charging interface. - Optionally, in some implementations, contact failure in the charging interface can be determined by the device to be charged. For example, the
communication circuit 23 sends a sixth instruction to thepower supply device 10, the sixth instruction is for enquiring output-voltage of thepower supply device 10; thecommunication circuit 23 receives a reply instruction of the sixth instruction from thepower supply device 10, the reply instruction of the sixth instruction is for indicating the output-voltage of thepower supply device 10, thecommunication circuit 23 determines whether there is contact failure in the charging interface according to present voltage of the battery and the output-voltage of thepower supply 10. When thecommunication circuit 23 determines that there is contact failure in the charging interface, thecommunication circuit 23 can send a fifth instruction to thepower supply device 10, the fifth instruction is for indicating contact failure in the charging interface. After receiving the fifth instruction, thepower supply device 10 can exit the second charging mode. - The following will describe in detail a communication process between the
power supply device 10 and the device to be charged 40 (thecommunication circuit 23 of the device to be charged 40, to be specific) in conjunction withFIG. 13 . It should be noted that, the example ofFIG. 13 is just for those skilled in the art to understand the implementations of the disclosure, instead of limiting the implementations of the disclosure to specific numeric values or specific situations of the example. Those skilled in the art can make equivalent modifications and changes without departing from the scope of the implementations of the disclosure. - As illustrated in
FIG. 13 , the communication procedure between thepower supply device 10 and the device to be charged 40 (also referred to as the communication procedure of a quick charging process) can include the following five stages. - Stage 1:
- After the device to be charged 40 is coupled with the
power supply device 10, the device to be charged 40 can detect the type of thepower supply device 10 though data line D+ and data line D−. When thepower supply device 10 is detected to be a power supply device specially configured to charge such as an adaptor, current absorbed by the device to be charged 40 can be higher than a preset current threshold value I2 (can be 1 A, for example). When thepower supply device 10 detects that output-current of thepower supply device 10 is larger than or equal to I2 within a preset duration (can be a continuous time period T1, for example), thepower supply device 10 can consider that identification of the type of the power supply device by the device to be charged 40 is completed. Next, thepower supply device 10 begins a negotiation process with the device to be charged 40 and send Instruction 1 (corresponding to the first instruction mentioned above), so as to enquire whether the device to be charged 40 agrees to be charged by thepower supply device 10 in the second charging mode. - When the
power supply device 10 receives a reply instruction ofInstruction 1 and the reply instruction ofInstruction 1 indicates that the device to be charged 40 disagrees to be charged by thepower supply device 10 in the second charging mode, thepower supply device 10 detects once again the output-current of thepower supply device 10. When the output-current of thepower supply device 10 is still larger than or equal to I2 within a preset continuous duration (can be a continuous time period T1), thepower supply device 10 sends once againInstruction 1 to enquire whether the device to be charged 40 agrees to be charged by thepower supply device 10 in the second charging mode. Thepower supply device 10 repeats the above operations atStage 1 until the device to be charged 40 agrees to be charged by thepower supply device 10 in the second charging mode, or the output-current of thepower supply device 10 is no longer larger than or equal to I2. - When the device to be charged 40 agrees to be charged by the
power supply device 10 in the second charging mode, the communication procedure proceeds toStage 2. - Stage 2:
- The output voltage of the
power supply device 10 can include multiple grades. Thepower supply device 10 sends Instruction 2 (corresponding to the second instruction mentioned above) to enquire whether the output voltage of the power supply device 10 (present output-voltage) matches present voltage of thebattery 30 of the device to be charged 40. - The device to be charged 40 sends a reply instruction of
Instruction 2 to indicate whether the output voltage of thepower supply device 10 matches the present voltage of thebattery 30 of the device to be charged 40 or does not match, that is, is at higher levels, or is at lower levels. When the reply instruction ofInstruction 2 indicates that the output voltage of thepower supply device 10 is at higher levels or is at lower levels, thepower supply device 10 can adjust the output voltage of thepower supply device 10 by one grade and send once againInstruction 2 to the device to be charged 40 to enquire whether the output voltage of thepower supply device 10 matches the present voltage of the battery. Repeat the above operations until the device to be charged 40 determines that the output voltage of thepower supply device 10 matches the present voltage of thebattery 30 of the device to be charged 40. and proceed toStage 3. - Stage 3:
- The
power supply device 10 sends Instruction 3 (corresponding to the third instruction mentioned above) to enquire a maximum charging current the device to be charged 40 supports. The device to be charged 40 sends a reply instruction ofInstruction 3 to indicate the maximum charging current the device to be charged 40 supports. Proceed to Stage 4. - Stage 4:
- The
power supply device 10 determines, according to the maximum charging current the device to be charged 40 supports, the charging current which is output by thepower supply device 10 in the second charging mode and used for charging the device to be charged 40. Proceed to Stage 5, the constant-current charging stage. - Stage 5:
- After proceeding to the constant-current charging stage, the
power supply device 10 can send Instruction 4 (corresponding to the fourth instruction mentioned above) to the device to be charged 40 at certain time intervals, so as to enquire present voltage of thebattery 30 of the device to be charged 40. The device to be charged 40 can send a reply instruction ofInstruction 4 to feed back the present voltage of the battery. Thepower supply device 10 can determine whether the charging interface is in a good contact and whether it is necessary to reduce the output current of thepower supply device 10, according to the present voltage of the battery. When thepower supply device 10 determines that there is contact failure in the charging interface, thepower supply device 10 can send Instruction 5 (corresponding to the fifth instruction mentioned above), thereby exiting the second charging mode and being reset to return toStage 1. - Optionally, in some implementations, at
Stage 1, when the device to be charged 40 sends the reply instruction ofInstruction 1, the reply instruction ofInstruction 1 can carry path impedance data (or information) of the device to be charged 40. The path impedance data of the device to be charged 40 can be used for determining whether the charging interface is in a good contact atStage 5. - Optionally, in some implementations, at
Stage 2, duration from when the device to be charged 40 agrees to be charged by thepower supply device 10 in the second charging mode to when thepower supply device 10 adjusts the output voltage thereof to a suitable charging voltage can be controlled within a certain range. When the duration is beyond the certain range, thepower supply device 10 or the device to be charged 40 can determine that the communication process is abnormal, being reset to return toStage 1. - Optionally, in some implementations, at
Stage 2, when the output voltage of thepower supply device 10 is higher than the present voltage of the battery of the device to be charged 40 by ΔV(ΔV can be set between 200 mV and 500 mV), the device to be charged 40 can send the reply instruction ofInstruction 2 to indicate that the output voltage of thepower supply device 10 matches the voltage of the battery of the device to be charged 40. - Optionally, in some implementations, at
Stage 4, adjusting speed of the output current of thepower supply device 10 can be controlled within a certain range, so as to avoid abnormality of the charging process resulting from excessively high adjusting speed. - Optionally, in some implementations, at
Stage 5, change magnitude of the output current of thepower supply device 10 can be controlled within 5%. - Optionally, in some implementations, at
Stage 5, thepower supply device 10 can detect in real time impedance of charging path. Specifically, thepower supply device 10 can detect the impedance of charging path according to the output voltage and the output current of thepower supply device 10 and the present voltage of the battery fed back by the device to be charged 40. When the impedance of charging path is higher than the impedance of path of the device to be charged 40 plus impedance of a charging cable, it indicates that there is contact failure in the charging interface, and thus thepower supply device 10 stops charging the device to be charged 40 in the second charging mode. - Optionally, in some implementations, after the
power supply device 10 enables the second charging mode to charge the device to be charged 40, time intervals of communication between thepower supply device 10 and the device to be charged 40 can be controlled within a certain range, to avoid abnormality of communication resulting from excessively short time intervals of communication. - Optionally, in some implementations, stopping of the charging process (or stopping of the
power supply device 10 charging the device to be charged 40 in the second charging mode) can include a recoverable stopping and a non-recoverable stopping. - For example, when it is detected that the battery of the device to be charged 40 is fully charged or there is contact failure in the charging interface, the charging process stops, a charging communication process is reset, and the charging process enters again
Stage 1. Then, when the device to be charged 40 disagrees to be charged by thepower supply device 10 in the second charging mode, the communication procedure will not proceed to Stage 2. The stopping of the charging process in this case can be considered as the non-recoverable stopping. - For another example, when there is abnormality of the communication between the
power supply device 10 and the device to be charged 40, the charging process stops, the charging communication process is reset, and the charging process enters againStage 1. After requirements onStage 1 are satisfied, the device to be charged 40 agrees to be charged by thepower supply device 10 in the second charging mode, so as to recover the charging process. The stopping of the charging process in this case can be considered as the recoverable stopping. - For yet another example, when the device to be charged 40 detects abnormality of the battery, the charging process stops and is reset to enter again
Stage 1. Then, the device to be charged 40 disagrees to be charged by thepower supply device 10 in the second charging mode. After the battery returns to normal and the requirements onStage 1 are satisfied, the device to be charged 40 agrees to be charged by the power supply device in the second charging mode. The stopping of the quick charging process in this case can be considered as the recoverable stopping. - The above communication steps or operations of
FIG. 13 are just illustrative. For instance, atStage 1, after the device to be charged 40 is coupled with thepower supply device 10, handshake communication between the device to be charged 40 and thepower supply device 10 can also be initiated by the device to be charged 40. In other words, the device to be charged 40 sendsInstruction 1, to enquire whether thepower supply device 10 enables the second charging mode. When the device to be charged 40 receives a reply instruction from thepower supply device 10 indicating that thepower supply device 10 agrees to charge the device to be charged 40 in the second charging mode, thepower supply device 10 begins to charge the battery of the device to be charged 40 in the second charging mode. - For another instance, after
Stage 5, the communication procedure can further include the constant-voltage charging stage. Specifically, atStage 5, the device to be charged 40 can feed back the present voltage of the battery to thepower supply device 10. When the present voltage of the battery reaches a threshold value of charging voltage in the constant-voltage charging stage, the charging stage turns to the constant-voltage charging stage from the constant-current charging stage. In the constant-voltage charging stage, the charging current gradually decreases. When the charging current decreases to a certain threshold value, it indicates that the battery of the device to be charged 40 is fully charged, and thus the whole charging process is stopped. - Apparatus implementations of the disclosure are described in detail above in conjunction with
FIG. 1 toFIG. 13 . The following will describe in detail method implementations of the disclosure in conjunction withFIG. 14 . It should be understood that, description of method and description of apparatus correspond to each other. For simplicity, repeated description will be properly omitted. -
FIG. 14 is a schematic flowchart illustrating a battery management method according to an implementation of the present disclosure. The battery management method illustrated inFIG. 14 is applicable to a battery management circuit including a first charging channel, a balancing circuit, and a communication circuit. Through the first charging channel, charging voltage and/or charging current is received from a power supply device and applied directly to a battery for charging. The battery includes a first cell and a second cell coupled in series. The balancing circuit is coupled with the first cell and the second cell and configured to balance voltage of the first cell and voltage of the second cell. The balancing circuit includes an RLC series circuit, a switch circuit, and a control circuit. The switch circuit has one end coupled with the first cell and the second cell and another end coupled with the RLC series circuit, and the switch circuit has a control end coupled with the control circuit. - The battery management method includes operations at
blocks 1410 to 1420. The following will describe the method in detail. - At
block 1410, when the power supply device charges the battery through the first charging channel, the communication circuit communicates with the power supply device to make magnitude of the charging voltage and/or charging current received from the power supply device match a present charging stage of the battery. - At
block 1420, when the voltage of the first cell and the voltage of the second cell are unbalanced, the control circuit controls the switch circuit to make the first cell and the second cell alternately form a closed loop with the RLC series circuit to provide input voltage for the RLC series circuit. - Optionally, in some implementations, the control circuit controls the switch circuit to make frequency of input voltage of the RLC series circuit be equal to resonant frequency of the RLC series circuit.
- Optionally, in some implementations, the switch circuit includes a first switch transistor, a second switch transistor, a third switch transistor, and a fourth switch transistor. The first switch transistor has a first connected end coupled with a positive electrode of the first cell and a second connected end coupled with a first connected end of the second switch transistor. The second switch transistor has a second connected end coupled with a first connected end of the third switch transistor and a negative electrode of the first cell. The third switch transistor has a second connected end coupled with a first connected end of the fourth switch transistor. The fourth switch transistor has a second connected end coupled with a negative electrode of the second cell. The second cell has a positive electrode coupled with a negative electrode of the first cell. The first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor each has a control end coupled with the control circuit. Components of the RLC series circuit are coupled in series between the second connected end of the first switch transistor and the second connected end of the third switch transistor.
- Optionally, in some implementations, the switch circuit includes a first switch transistor, a second switch transistor, a third switch transistor, and a fourth switch transistor. The first switch transistor has a first connected end coupled with a positive electrode of the first cell and a second connected end coupled with a first connected end of the second switch transistor. The second switch transistor has a second connected end coupled with a first connected end of the third switch transistor. The third switch transistor having a second connected end coupled with a first connected end of the fourth switch transistor. The fourth switch transistor having a second connected end coupled with a negative electrode of the second cell. The second cell having a positive electrode coupled with a negative electrode of the first cell. The first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor each has a control end coupled with the control circuit. At least part of components of the RLC series circuit are coupled in series between the second connected end of the second switch transistor and the negative electrode of the first cell. Components of the RLC series circuit, other than the at least part of components of the RLC series circuit (that is, those coupled in series between the second connected end of the second switch transistor and the negative electrode of the first cell) are coupled in series between the second connected end of the first switch transistor and the second connected end of the third switch transistor.
- Optionally, in some implementations, when the voltage of the first cell and the voltage of the second cell are unbalanced, operations at
block 1420 can include the following. When the voltage of the first cell and the voltage of the second cell are unbalanced and the voltage of the first cell is higher than the voltage of the second cell, control the first switch transistor and the third switch transistor to an on-state from time t0 to time t1 and control the second switch transistor and the fourth switch transistor to an off-state from time t0 to time t1, where time t0 represents a start time of a work period of the control circuit; control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to the off-state from time t1 to time t2, where a time period from time t1 to time t2 represents a preset first dead time; control the second switch transistor and the fourth switch transistor to the on-state from time t2 to time t3 and control the first switch transistor and the third switch transistor to the off-state from time t2 to time t3; control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to the off-state from time t3 to time t4, where t4 represents an end time of the work period and a time period from time t3 to time t4 represents a preset second dead time. - Optionally, in some implementations, working frequency of the control circuit is equal to the resonant frequency of the RLC series circuit.
- Optionally, in some implementations, when the voltage of the first cell and the voltage of the second cell are unbalanced, operations at
block 1420 can include the following. When the voltage of the first cell and the voltage of the second cell are unbalanced and the voltage of the second cell is higher than the voltage of the first cell, control the second switch transistor and the fourth switch transistor to an on-state from time t0 to time t1 and control the first switch transistor and the third switch transistor to an off-state from time t0 to time t1, where time t0 represents a start time of a work period of the control circuit; control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to the off-state from time t1 to time t2, where a time period from time t1 to time t2 represents a preset first dead time; control the first switch transistor and the third switch transistor to the on-state from time t2 to time t3 and control the second switch transistor and the fourth switch transistor to the off-state from time t2 to time t3; control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to the off-state from time t3 to time t4, where time t4 represents an end time of the work period, and a time period from time t3 to time t4 represents a second dead time. - Optionally, in some implementations, working frequency of the control circuit is equal to the resonant frequency of the RLC series circuit.
- Optionally, in some implementations, the battery management circuit further includes a second charging channel provided with a boost circuit, the boost circuit is configured to receive initial voltage from the power supply device and increase the initial voltage to a target voltage to charge the battery according to the target voltage, when the power supply device charges the battery through the second charging channel. The initial voltage is lower than total voltage of the battery and the target voltage is higher than the total voltage of the battery.
- The above example illustrates the balancing
circuit 22, as a part of thebattery management circuit 20, providing a balancing method to balance the voltage of thefirst cell 31 a and the voltage of thesecond cell 31 b, where thefirst cell 31 a and thesecond cell 31 b are coupled in series and managed by thebattery management circuit 20. However, implementations of the disclosure are not limited to the above example. Practically, the balancingcircuit 22 can be applied to any situation where voltage between cells needs to be balanced. - Those of ordinary skill in the art will appreciate that units (including sub-units) and algorithmic operations of various examples described in connection with implementations herein can be implemented by electronic hardware or by a combination of computer software and electronic hardware. Whether these functions are performed by means of hardware or software depends on the application and the design constraints of the associated technical solution. A professional technician may use different methods with regard to each particular application to implement the described functionality, but such methods should not be regarded as lying beyond the scope of the disclosure.
- It will be evident to those skilled in the art that the corresponding processes of the above method implementations can be referred to for the working processes of the foregoing systems, apparatuses, and units, for purposes of convenience and simplicity and will not be repeated herein.
- It will be appreciated that the systems, apparatuses, and methods disclosed in implementations herein may also be implemented in various other manners. For example, the above apparatus implementations are merely illustrative, e.g., the division of units (including sub-units) is only a division of logical functions, and there may exist other ways of division in practice, e.g., multiple units (including sub-units) or components may be combined or may be integrated into another system, or some features may be ignored or not included. In other respects, the coupling or direct coupling or communication connection as illustrated or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical, or otherwise.
- Separated units (including sub-units) as illustrated may or may not be physically separated. Components or parts displayed as units (including sub-units) may or may not be physical units, and may reside at one location or may be distributed to multiple networked units. Some or all of the units (including sub-units) may be selectively adopted according to practical needs to achieve desired objectives of the disclosure.
- Additionally, various functional units (including sub-units) described in implementations herein may be integrated into one processing unit or may be present as a number of physically separated units, and two or more units may be integrated into one.
- If the integrated units are implemented as software functional units and sold or used as standalone products, they may be stored in a computer readable storage medium. Based on such an understanding, the essential technical solution, or the portion that contributes to the prior art, or all or part of the technical solution of the disclosure may be embodied as software products. Computer software products can be stored in a storage medium and may include multiple instructions that, when executed, can cause a computing device, e.g., a personal computer, a server, a second adapter, a network device, etc., to execute some or all operations of the methods as described in the various implementations. The above storage medium may include various kinds of media that can store program code, such as a USB flash disk, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10886766B2 (en) * | 2017-04-28 | 2021-01-05 | Contemporary Amperex Technology Co., Limited | Method and device for multi-stage battery charging |
US11018512B2 (en) * | 2018-12-06 | 2021-05-25 | Hitachi Automotive Systems Americas, Inc. | Energy storage device charge balancing |
US20210349505A1 (en) * | 2020-05-07 | 2021-11-11 | Google Llc | Multi-Battery Support for Wearables |
US11251628B2 (en) * | 2017-01-23 | 2022-02-15 | Rafael Advanced Defense Systems Ltd. | System for balancing a series of cells |
US20220065934A1 (en) | 2020-09-01 | 2022-03-03 | Samsung Electronics Co., Ltd. | Method and apparatus with battery state estimation |
US11476677B2 (en) | 2020-06-02 | 2022-10-18 | Inventus Power, Inc. | Battery pack charge cell balancing |
US11489343B2 (en) | 2020-06-02 | 2022-11-01 | Inventus Power, Inc. | Hardware short circuit protection in a large battery pack |
US11498446B2 (en) * | 2020-01-06 | 2022-11-15 | Ford Global Technologies, Llc | Plug-in charge current management for battery model-based online learning |
US11545841B2 (en) * | 2019-11-18 | 2023-01-03 | Semiconductor Components Industries, Llc | Methods and apparatus for autonomous balancing and communication in a battery system |
US11552479B2 (en) | 2020-06-02 | 2023-01-10 | Inventus Power, Inc. | Battery charge balancing circuit for series connections |
US11588334B2 (en) | 2020-06-02 | 2023-02-21 | Inventus Power, Inc. | Broadcast of discharge current based on state-of-health imbalance between battery packs |
US11594892B2 (en) | 2020-06-02 | 2023-02-28 | Inventus Power, Inc. | Battery pack with series or parallel identification signal |
US11695280B2 (en) | 2019-11-29 | 2023-07-04 | Samsung Electronics Co, Ltd | Electronic device for managing multiple batteries connected in series and method for operating same |
US11699908B2 (en) | 2020-06-02 | 2023-07-11 | Inventus Power, Inc. | Large-format battery management system identifies power degradation |
US11705741B2 (en) | 2020-07-24 | 2023-07-18 | Inventus Power, Inc. | Mode-based disabling of communication bus of a battery management system |
US11817723B2 (en) | 2020-06-02 | 2023-11-14 | Inventus Power, Inc. | Large-format battery management system with in-rush protection using multiple thermistors |
Families Citing this family (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5545970B2 (en) * | 2009-03-26 | 2014-07-09 | 株式会社半導体エネルギー研究所 | Light emitting device and manufacturing method thereof |
EP3429057B1 (en) * | 2016-01-05 | 2021-10-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Quick charging method, mobile terminal, and power adapter |
CN209488195U (en) * | 2016-10-12 | 2019-10-11 | Oppo广东移动通信有限公司 | Mobile terminal |
US11056896B2 (en) | 2016-10-12 | 2021-07-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Terminal and device |
CN109417308B (en) | 2017-04-07 | 2023-06-20 | Oppo广东移动通信有限公司 | Wireless charging system, device and method and equipment to be charged |
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EP3462565B1 (en) | 2017-04-13 | 2021-02-24 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged and charging method |
CN108769088B (en) * | 2018-03-14 | 2021-01-08 | 维沃移动通信有限公司 | Communication method and communication device |
CN108448673B (en) * | 2018-03-29 | 2020-08-18 | 维沃移动通信有限公司 | Charging method, mobile terminal and charger |
WO2019218162A1 (en) * | 2018-05-15 | 2019-11-21 | Oppo广东移动通信有限公司 | Device to be charged and wireless charging method and system |
CN108767919B (en) * | 2018-05-25 | 2021-05-28 | 维沃移动通信有限公司 | Charging device, terminal equipment and charging method |
JP7185692B2 (en) * | 2018-05-31 | 2022-12-07 | オッポ広東移動通信有限公司 | Charging method and charging device |
CN110677041B (en) * | 2018-07-03 | 2022-03-18 | 株式会社村田制作所 | Control method and control device for DC converter |
DE102018214612A1 (en) * | 2018-08-29 | 2020-03-05 | Robert Bosch Gmbh | Method for detecting contact errors in a battery pack and system for carrying out the method |
CN108973758A (en) * | 2018-08-31 | 2018-12-11 | 金华安靠电源科技有限公司 | A kind of charging recognition methods of charging system for electric automobile and electric car charging circuit |
US11342764B2 (en) * | 2018-11-28 | 2022-05-24 | Shenzhen Innokin Technology Co., Ltd. | Low voltage charging control and protection circuit for electronic cigarette and method of charging the electronic cigarette using the circuit |
TWI681286B (en) * | 2018-11-29 | 2020-01-01 | 群光電能科技股份有限公司 | Power supply apparatus |
CN109510272B (en) * | 2018-12-07 | 2022-04-29 | 青岛海信移动通信技术股份有限公司 | Charging control method and charging circuit |
EP3706282B1 (en) * | 2018-12-21 | 2023-04-05 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged and charging control method |
CN113056855A (en) * | 2018-12-21 | 2021-06-29 | Oppo广东移动通信有限公司 | Charging control device and method and electronic equipment |
US11221663B2 (en) | 2019-02-07 | 2022-01-11 | Datalogic Ip Tech S.R.L. | Removal prediction of a data reader from a charging base unit |
WO2020191550A1 (en) | 2019-03-22 | 2020-10-01 | Oppo广东移动通信有限公司 | Charging and discharging control method and device to be charged |
US20200395774A1 (en) * | 2019-06-17 | 2020-12-17 | Renesas Electronics America Inc. | Single inductor multiple output charger for multiple battery applications |
CN110635186B (en) * | 2019-08-29 | 2021-06-01 | 华为技术有限公司 | Charging method and electronic equipment |
CN112994126A (en) * | 2019-12-13 | 2021-06-18 | 北京小米移动软件有限公司 | Charging circuit, electronic device, charging method and device |
CN111327097B (en) * | 2020-03-09 | 2023-08-08 | Oppo广东移动通信有限公司 | Charging circuit and electronic equipment |
CN111817388A (en) * | 2020-07-14 | 2020-10-23 | Oppo广东移动通信有限公司 | Charging circuit and electronic device |
CN111817387A (en) * | 2020-07-14 | 2020-10-23 | Oppo广东移动通信有限公司 | Charging circuit, control method thereof and electronic equipment |
CN113937837A (en) * | 2020-07-14 | 2022-01-14 | Oppo广东移动通信有限公司 | Charging circuit and electronic device |
CN111864843A (en) * | 2020-07-27 | 2020-10-30 | Oppo广东移动通信有限公司 | Double-battery charging device and mobile terminal |
US11646597B2 (en) * | 2020-09-08 | 2023-05-09 | Southwest Research Institute | Fast charging for lithium-ion batteries using pulse width modulated charging and cooling |
CN112319296B (en) * | 2020-10-13 | 2022-08-30 | 武汉蔚来能源有限公司 | Charging protection method and system and rechargeable battery |
CN112350397A (en) * | 2020-10-21 | 2021-02-09 | 成都芯源系统有限公司 | Battery charging circuit and charging method for the same |
CN114844135A (en) * | 2021-02-02 | 2022-08-02 | 北京小米移动软件有限公司 | Charging method, charging device, terminal and storage medium |
US11904727B2 (en) * | 2021-03-03 | 2024-02-20 | Ford Global Technologies, Llc | Battery thermal management via current control |
US11846679B2 (en) * | 2021-05-04 | 2023-12-19 | International Business Machines Corporation | Battery control using non-linear rate-of-change failure threshold(s) |
WO2022246771A1 (en) * | 2021-05-27 | 2022-12-01 | 华为技术有限公司 | Charging and discharging circuit and terminal device |
JP2023032026A (en) * | 2021-08-26 | 2023-03-09 | 株式会社今仙電機製作所 | active balancer |
KR102464670B1 (en) * | 2021-09-06 | 2022-11-09 | 울산대학교 산학협력단 | Apparatus and method for balancing charging of battery cells |
WO2023146128A1 (en) * | 2022-01-25 | 2023-08-03 | 삼성전자 주식회사 | Electronic device for suppressing heating |
CN114498866B (en) * | 2022-04-19 | 2022-07-29 | 伏达半导体(合肥)有限公司 | Dual-battery charging device and method and controller thereof |
CN115864609B (en) * | 2023-02-23 | 2023-06-30 | 荣耀终端有限公司 | Electronic equipment and charging method |
Family Cites Families (168)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2242793B (en) * | 1990-04-05 | 1994-08-10 | Technophone Ltd | Battery charging apparatus |
JPH0773413B2 (en) * | 1990-07-31 | 1995-08-02 | 三洋電機株式会社 | External battery adapter and battery system |
DE69130729D1 (en) * | 1990-11-07 | 1999-02-18 | Toshiba Kawasaki Kk | Computer power supply control device |
EP0494780B1 (en) * | 1991-01-11 | 1997-03-26 | Kabushiki Kaisha Toshiba | An adapter unit for adaptively supplying a portable radio telephone with power |
JPH0624357U (en) | 1992-08-20 | 1994-03-29 | 株式会社アイチコーポレーション | Power supply |
JP2601974B2 (en) * | 1992-09-16 | 1997-04-23 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Power supply for electronic equipment and electronic equipment system |
JP3421373B2 (en) * | 1992-11-26 | 2003-06-30 | 三洋電機株式会社 | Attachment, charging device and power supply device |
GB2284127B (en) | 1993-11-22 | 1998-08-12 | Matsushita Electric Ind Co Ltd | Cordless telephone system |
JP3185502B2 (en) | 1993-11-22 | 2001-07-11 | 松下電器産業株式会社 | Cordless telephone equipment |
US5532524A (en) * | 1994-05-11 | 1996-07-02 | Apple Computer, Inc. | Distributed power regulation in a portable computer to optimize heat dissipation and maximize battery run-time for various power modes |
JP3620118B2 (en) * | 1995-10-24 | 2005-02-16 | 松下電器産業株式会社 | Constant current / constant voltage charger |
US6008620A (en) * | 1996-04-05 | 1999-12-28 | Sony Corporation | Battery charging device, method for charging battery pack and battery pack |
US5877564A (en) * | 1997-02-18 | 1999-03-02 | Nokia Mobile Phones Limited | Mobile station voltage supply using level shift of base band operating voltages |
US6040684A (en) * | 1997-06-30 | 2000-03-21 | Compaq Computer Corporation | Lithium ion fast pulse charger |
US6835491B2 (en) | 1998-04-02 | 2004-12-28 | The Board Of Trustees Of The University Of Illinois | Battery having a built-in controller |
US6326767B1 (en) | 1999-03-30 | 2001-12-04 | Shoot The Moon Products Ii, Llc | Rechargeable battery pack charging system with redundant safety systems |
JP2000333377A (en) * | 1999-05-21 | 2000-11-30 | Sony Computer Entertainment Inc | Entertainment system and charging system |
CA2380586A1 (en) * | 2002-04-05 | 2003-10-05 | Robert S. Feldstein | Fast pulse battery charger |
US6841971B1 (en) | 2002-05-29 | 2005-01-11 | Alpha Technologies, Inc. | Charge balancing systems and methods |
US7076375B2 (en) * | 2002-06-27 | 2006-07-11 | Spx Corporation | Apparatus and method for incorporating the use of a processing device into a battery charger and tester |
US7193392B2 (en) * | 2002-11-25 | 2007-03-20 | Tiax Llc | System and method for determining and balancing state of charge among series connected electrical energy storage units |
US6873134B2 (en) * | 2003-07-21 | 2005-03-29 | The Boeing Company | Autonomous battery cell balancing system with integrated voltage monitoring |
US20050077875A1 (en) * | 2003-10-14 | 2005-04-14 | Bohley Thomas K. | Battery cell balancing circuit |
KR20050106745A (en) | 2004-05-06 | 2005-11-11 | 삼성전자주식회사 | Apparatus for supplying power in portable device |
DE102004031216A1 (en) | 2004-06-28 | 2006-01-19 | Siemens Ag | Apparatus and method for charge equalization in series connected energy storage |
JP2006166615A (en) * | 2004-12-08 | 2006-06-22 | Fuji Heavy Ind Ltd | Voltage equalization control system of storage device |
JP2006353010A (en) | 2005-06-16 | 2006-12-28 | Renesas Technology Corp | Secondary battery pack and manufacturing method therefor |
US20070139012A1 (en) | 2005-11-01 | 2007-06-21 | Aerovironment, Inc. | Motive power dual battery pack |
JP2007336664A (en) | 2006-06-14 | 2007-12-27 | Mitsumi Electric Co Ltd | Secondary battery charging circuit |
CN101150327A (en) | 2006-09-22 | 2008-03-26 | 鸿富锦精密工业(深圳)有限公司 | Portable device power borrowing system and portable device |
KR101380748B1 (en) | 2006-10-10 | 2014-04-02 | 삼성전자 주식회사 | Computer system and control method thereof capable of changing battery charging mode according to user's selection |
JP2008182809A (en) * | 2007-01-24 | 2008-08-07 | Matsushita Electric Ind Co Ltd | Battery circuit, battery pack, and battery system |
US7598706B2 (en) * | 2007-01-26 | 2009-10-06 | General Electric Company | Cell balancing battery pack and method of balancing the cells of a battery |
CN101022179A (en) * | 2007-03-15 | 2007-08-22 | 淮阴工学院 | Storage battery fast charging method |
US8098048B2 (en) | 2007-06-15 | 2012-01-17 | The Gillette Company | Battery charger with integrated cell balancing |
JP4805223B2 (en) * | 2007-07-27 | 2011-11-02 | レノボ・シンガポール・プライベート・リミテッド | Charging system and charging method |
CN101442209A (en) * | 2007-11-22 | 2009-05-27 | 威海科益达电子有限公司 | Cascade combined protection equilibrium module for large-capacity lithium ion battery |
JP2009159726A (en) | 2007-12-26 | 2009-07-16 | Honda Motor Co Ltd | Discharge control system |
CN101557118B (en) | 2008-04-09 | 2012-05-30 | 鹏智科技(深圳)有限公司 | Charging control circuit of secondary battery |
TWI377758B (en) * | 2008-06-20 | 2012-11-21 | Green Solution Tech Co Ltd | The battery charging controller and battery module thereof |
CN201298737Y (en) * | 2008-09-23 | 2009-08-26 | 何远强 | Battery equalizing device |
CN101409455B (en) * | 2008-11-19 | 2011-10-26 | 华为终端有限公司 | Voltage balance apparatus and method for battery system |
JP4691171B2 (en) | 2009-03-11 | 2011-06-01 | 本田技研工業株式会社 | Charge / discharge device |
US8129952B2 (en) * | 2009-04-16 | 2012-03-06 | Valence Technology, Inc. | Battery systems and operational methods |
JP4966998B2 (en) | 2009-06-18 | 2012-07-04 | パナソニック株式会社 | Charge control circuit, battery pack, and charging system |
CN101986502A (en) | 2009-07-28 | 2011-03-16 | 深圳富泰宏精密工业有限公司 | Mobile phone battery charging circuit |
JP2011055308A (en) | 2009-09-02 | 2011-03-17 | Ricoh Co Ltd | Imaging apparatus |
US8405362B2 (en) | 2009-12-04 | 2013-03-26 | Linear Technology Corporation | Method and system for minimum output-voltage battery charger |
KR101097262B1 (en) | 2009-12-28 | 2011-12-21 | 삼성에스디아이 주식회사 | Battery pack and charging method of the same |
KR101211756B1 (en) | 2010-02-11 | 2012-12-12 | 삼성에스디아이 주식회사 | Battery Pack |
EP2367258B1 (en) * | 2010-03-16 | 2018-06-27 | CTEK Sweden AB | A combined battery charger and battery equalizer |
US20110140662A1 (en) | 2010-03-31 | 2011-06-16 | Guoxing Li | Balancing system for a battery pack |
TWI414125B (en) | 2010-04-14 | 2013-11-01 | Simplo Technology Co Ltd | Charging device and charging method |
US9054385B2 (en) | 2010-07-26 | 2015-06-09 | Energyor Technologies, Inc | Passive power management and battery charging for a hybrid fuel cell / battery system |
US9331499B2 (en) * | 2010-08-18 | 2016-05-03 | Volterra Semiconductor LLC | System, method, module, and energy exchanger for optimizing output of series-connected photovoltaic and electrochemical devices |
CN102377203B (en) * | 2010-08-26 | 2015-11-25 | 联想(北京)有限公司 | A kind of electronic equipment and charge control method thereof |
JP5937011B2 (en) * | 2010-10-19 | 2016-06-22 | 三洋電機株式会社 | Power supply device, vehicle using the same, and power storage device |
TWM402554U (en) * | 2010-11-10 | 2011-04-21 | Richtek Technology Corp | Charger circuit |
US8810207B2 (en) * | 2010-11-17 | 2014-08-19 | Texas Instruments Incorporated | Communication systems and methods for transmitting communications between a charge system and an AC adapter |
KR20120059247A (en) * | 2010-11-30 | 2012-06-08 | 현대자동차주식회사 | System for cell balance control of battery pack and method thereof |
CN102545278A (en) * | 2010-12-14 | 2012-07-04 | 西安众智惠泽光电科技有限公司 | Storage battery pack equalizing charging system |
CN102064702B (en) * | 2010-12-31 | 2013-09-11 | 刘闯 | Bidirectionally isolating type series resonance DC/DC converter |
TWI412205B (en) | 2011-01-28 | 2013-10-11 | Acbel Polytech Inc | Battery pack potential balance circuit |
CN102651563B (en) * | 2011-02-25 | 2014-06-18 | 香港理工大学 | Battery energy balancing circuit |
TW201246751A (en) * | 2011-05-12 | 2012-11-16 | Lite On Clean Energy Technology Corp | A battery system and a battery equalizer |
JP2012249410A (en) | 2011-05-27 | 2012-12-13 | Sharp Corp | Electric vehicle charger and charging system |
EP2538519B1 (en) * | 2011-06-15 | 2022-12-07 | Analog Devices International Unlimited Company | Stackable bi-directional multicell battery balancer |
JP5830971B2 (en) * | 2011-06-30 | 2015-12-09 | ソニー株式会社 | Battery monitor circuit, power storage device, electric vehicle, and power system |
US8947048B2 (en) * | 2011-07-29 | 2015-02-03 | Infineon Technologies Ag | Power supply system with charge balancing |
WO2013031412A1 (en) * | 2011-08-26 | 2013-03-07 | 本田技研工業株式会社 | Charging and discharging device |
JP5789846B2 (en) * | 2011-09-05 | 2015-10-07 | 三洋電機株式会社 | Power supply device for vehicle and vehicle equipped with this power supply device |
US9225179B2 (en) | 2011-10-12 | 2015-12-29 | Texas Instruments Incorporated | Capacitor-based active balancing for batteries and other power supplies |
CN103094939A (en) | 2011-11-01 | 2013-05-08 | 宏碁股份有限公司 | Battery management circuit |
TW201325014A (en) | 2011-12-02 | 2013-06-16 | Emerald Battery Technologies Co Ltd | Isolation-type battery balancing device |
WO2013084999A1 (en) * | 2011-12-08 | 2013-06-13 | 株式会社エネルギー応用技術研究所 | Rapid charging power supply system |
US8837170B2 (en) * | 2011-12-13 | 2014-09-16 | Busek Company | Passive resonant bidirectional converter with galvanic barrier |
CN103248077B (en) * | 2012-02-08 | 2016-05-18 | 东莞赛微微电子有限公司 | Battery equalizing circuit |
CN103247821A (en) * | 2012-02-10 | 2013-08-14 | 联想(北京)有限公司 | Battery and charging and discharging method |
JP5737207B2 (en) | 2012-02-15 | 2015-06-17 | 三菱自動車工業株式会社 | Voltage balance control device |
CN103311562B (en) | 2012-03-12 | 2015-06-03 | 联想(北京)有限公司 | Charging battery, and charging control method and discharging control method thereof |
JP5773920B2 (en) * | 2012-03-19 | 2015-09-02 | ルネサスエレクトロニクス株式会社 | Charger |
CN102655346B (en) * | 2012-04-25 | 2016-04-20 | 浙江大学 | There is Smart battery module and the battery pack of autobalance ability |
US20140042815A1 (en) * | 2012-06-10 | 2014-02-13 | The Regents of the University of Colorado, A Body Corporate | Balancing, filtering and/or controlling series-connected cells |
US9711962B2 (en) * | 2012-07-09 | 2017-07-18 | Davide Andrea | System and method for isolated DC to DC converter |
US10346567B2 (en) | 2012-07-13 | 2019-07-09 | Fu-Sheng Tsai | Method and apparatus for performing battery cell control with aid of virtual battery mechanism |
TWI560972B (en) | 2012-07-13 | 2016-12-01 | Fu Sheng Tsai | Balancing circuit for balancing battery units |
CN103181054B (en) * | 2012-08-07 | 2015-11-25 | 华为终端有限公司 | For device, method and the subscriber equipment of powering |
JP2014087200A (en) | 2012-10-25 | 2014-05-12 | Nec Personal Computers Ltd | Charger, charging method, program, and information processing apparatus |
CN103107575B (en) | 2013-01-18 | 2015-07-29 | 华为终端有限公司 | Charging method, mobile device, charging device and charging system |
CN204992789U (en) | 2013-01-21 | 2016-01-20 | 株式会社村田制作所 | Power transmission system |
JP2014158346A (en) * | 2013-02-15 | 2014-08-28 | Omron Automotive Electronics Co Ltd | Voltage monitoring apparatus for battery pack |
JP6028625B2 (en) * | 2013-02-28 | 2016-11-16 | ミツミ電機株式会社 | Charge / discharge control circuit and charge / discharge control method |
TWI482391B (en) * | 2013-04-02 | 2015-04-21 | Wistron Corp | Charging circuit for electronic device and related charging method |
CN103219769B (en) | 2013-04-17 | 2015-12-02 | 广东欧珀移动通信有限公司 | Method for charging batteries, batter-charghing system and mobile terminal |
KR101470735B1 (en) * | 2013-05-15 | 2014-12-08 | 주식회사 엘지씨엔에스 | Apparatus and Method with an active balancing control circuit and an active balancing algorithm for charging and discharging the series connected secondary batteries |
JP6127290B2 (en) | 2013-05-28 | 2017-05-17 | 国立研究開発法人宇宙航空研究開発機構 | Charger / discharger with equalization function using both converter and multi-stage voltage doubler rectifier circuit |
CN103326552B (en) * | 2013-06-28 | 2016-03-30 | 成都多林电器有限责任公司 | The current balance system of super high power IGBT induction heating equipment and full-bridge inverting unit |
CN103441542B (en) * | 2013-08-13 | 2015-02-11 | 天津谷泰科技有限公司 | Lithium battery distributed charging equalization circuit and control method thereof |
JP2015065795A (en) * | 2013-09-26 | 2015-04-09 | ソニー株式会社 | Power storage, power storage controller and power storage control method |
JP6112222B2 (en) * | 2013-11-13 | 2017-04-12 | 株式会社村田製作所 | Frequency characteristic measurement method |
JP6301637B2 (en) | 2013-11-20 | 2018-03-28 | Necプラットフォームズ株式会社 | Electronic device and charging method |
EP2879266A1 (en) * | 2013-11-28 | 2015-06-03 | Dialog Semiconductor GmbH | Power management method for a stacked cell rechargeable energy storage and stacked cell rechargeable energy storage device |
CN103746425B (en) | 2014-01-09 | 2016-02-17 | 成都芯源系统有限公司 | Mobile power supply circuit and method thereof |
KR20150085642A (en) | 2014-01-16 | 2015-07-24 | 삼성전자주식회사 | Power supply, electronic apparatus including the same and method for power supplying |
CN103762690B (en) * | 2014-01-28 | 2016-08-24 | 广东欧珀移动通信有限公司 | Charging system |
CN203747451U (en) | 2014-01-28 | 2014-07-30 | 广东欧珀移动通信有限公司 | Battery charging device |
CN104810873B (en) * | 2014-01-28 | 2018-03-16 | 广东欧珀移动通信有限公司 | Electronic equipment battery charge controller and method |
CN106532884B (en) * | 2014-01-28 | 2019-07-19 | Oppo广东移动通信有限公司 | Battery charger and method |
CN106385094B (en) * | 2014-01-28 | 2019-02-12 | Oppo广东移动通信有限公司 | Control method for quickly charging and system |
CN106787027B (en) * | 2014-01-28 | 2019-05-10 | Oppo广东移动通信有限公司 | Charge mode switching circuit and method |
CN103762702B (en) | 2014-01-28 | 2015-12-16 | 广东欧珀移动通信有限公司 | Charging device of electronic appliances and power supply adaptor thereof |
TWI492482B (en) | 2014-02-27 | 2015-07-11 | Hycon Technology Corp | Master-slave type battery management system for accurate capacity gauge of battery pack |
JP2015180179A (en) * | 2014-02-27 | 2015-10-08 | 日立工機株式会社 | Charger |
TWI536706B (en) | 2014-03-11 | 2016-06-01 | 登騰電子股份有限公司 | Smart power adaptor and control method of power supplay thereof |
WO2015147503A1 (en) * | 2014-03-28 | 2015-10-01 | Samsung Electronics Co., Ltd. | Method for charging battery and electronic device |
TW201539935A (en) | 2014-04-03 | 2015-10-16 | Lausdeo Corp | Mobile power bank |
US20150295426A1 (en) * | 2014-04-11 | 2015-10-15 | Kabushiki Kaisha Toshiba | Battery and electronic device |
CN203813491U (en) | 2014-04-29 | 2014-09-03 | 深圳市前海富达科技有限公司 | Charging adapter device |
US9800075B2 (en) | 2014-06-04 | 2017-10-24 | Societe Bic | Smart charging cable and method for operating a portable electronic device |
CN104065147B (en) * | 2014-06-27 | 2017-06-06 | 宇龙计算机通信科技(深圳)有限公司 | A kind of charging adapter, terminal, charge control method |
CN104124734B (en) * | 2014-07-22 | 2016-09-14 | 深圳市富满电子集团股份有限公司 | A kind of charging system and charging method |
CN104167780B (en) | 2014-07-30 | 2016-06-08 | 广州益维电动汽车有限公司 | A kind of continuous controlled isolating active active equalization charging module and charge system thereof |
CN105471001A (en) * | 2014-08-19 | 2016-04-06 | 中兴通讯股份有限公司 | Mobile terminal using multi-cathode mix battery and charging and discharging circuit thereof |
US9997933B2 (en) * | 2014-09-03 | 2018-06-12 | Mophie, Inc. | Systems and methods for battery charging and management |
JP6400407B2 (en) * | 2014-09-18 | 2018-10-03 | Ntn株式会社 | Charger |
JP6428107B2 (en) | 2014-09-29 | 2018-11-28 | 株式会社村田製作所 | Power storage device, electronic device, electric vehicle and power system |
KR101712244B1 (en) * | 2014-10-08 | 2017-03-13 | 주식회사 엘지화학 | System and method for balancing a battery cell using LC resonance |
TWI640145B (en) | 2014-10-13 | 2018-11-01 | 力智電子股份有限公司 | Adapter, portable electronic device and charge control method thereof |
CN204243803U (en) | 2014-10-14 | 2015-04-01 | 深圳市坤兴科技有限公司 | A kind of Multifunctional portable power source |
CN105576306A (en) * | 2014-10-17 | 2016-05-11 | 东莞新能源科技有限公司 | Fast battery charging method |
CN108667094B (en) * | 2014-11-11 | 2020-01-14 | Oppo广东移动通信有限公司 | Communication method, power adapter and terminal |
EP3220506B1 (en) * | 2014-11-11 | 2020-02-19 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Communication method, power adaptor and terminal |
DK3131171T3 (en) * | 2014-11-11 | 2019-04-15 | Guangdong Oppo Mobile Telecommunications Corp Ltd | POWER ADAPTERS, TERMINAL AND CHARGING SYSTEM |
MY176505A (en) * | 2014-11-11 | 2020-08-12 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Power adapter and terminal |
TWI524626B (en) * | 2014-12-05 | 2016-03-01 | 利佳興業股份有限公司 | Modularized bidirectional push/pull type battery balancing monitoring system |
WO2016098631A1 (en) | 2014-12-15 | 2016-06-23 | 日本電気株式会社 | Battery pack, electronic instrument, cell balance device, cell balance method, and program |
US9929582B2 (en) * | 2014-12-23 | 2018-03-27 | Intel Corporation | Adaptive charge current for a battery |
CN105762884B (en) * | 2014-12-24 | 2020-01-17 | Oppo广东移动通信有限公司 | Method for charging electronic device and electronic device |
JP6222744B2 (en) | 2015-01-16 | 2017-11-01 | オムロンオートモーティブエレクトロニクス株式会社 | Power control device |
CN204481505U (en) | 2015-01-30 | 2015-07-15 | 深圳众思康科技有限公司 | Multisection lithium battery series connection quick charge device |
US9678528B2 (en) | 2015-02-15 | 2017-06-13 | Skyworks, Solutions Inc. | Voltage supply system with boost converter and charge pump |
CN104659885B (en) | 2015-03-23 | 2017-01-04 | 阳光电源股份有限公司 | A kind of balanced system for storage battery pack and balance control method |
CN204668976U (en) * | 2015-03-26 | 2015-09-23 | 深圳市力可普尔电子有限公司 | Portable power source and charging system |
CN106160038B (en) | 2015-03-31 | 2018-11-09 | 鸿富锦精密工业(武汉)有限公司 | Charging circuit |
AU2015397725B2 (en) | 2015-06-01 | 2018-10-04 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging circuit and mobile terminal |
JP2017529044A (en) | 2015-06-01 | 2017-09-28 | グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッド | Charging circuit and mobile terminal |
CN104917271A (en) | 2015-06-19 | 2015-09-16 | 李�昊 | Adapter |
CN105071451A (en) * | 2015-07-14 | 2015-11-18 | 合肥华信电动科技发展有限公司 | Battery management system |
CN104993182B (en) * | 2015-08-05 | 2018-01-09 | 青岛海信移动通信技术股份有限公司 | A kind of mobile terminal, can directly charge source adapter and charging method |
CN105098900B (en) | 2015-08-05 | 2018-05-29 | 青岛海信移动通信技术股份有限公司 | Mobile terminal, can directly charge source adapter and charging method |
CN104967201B (en) | 2015-08-05 | 2018-10-02 | 青岛海信移动通信技术股份有限公司 | Fast charge method, mobile terminal and the source adapter that can directly charge |
CN105140985B (en) * | 2015-08-05 | 2017-08-25 | 青岛海信移动通信技术股份有限公司 | Mobile terminal, can directly charge source adapter and charging method |
CN104993565B (en) * | 2015-08-05 | 2017-12-05 | 青岛海信移动通信技术股份有限公司 | Can directly be charged source adapter |
CN105048602B (en) * | 2015-08-31 | 2017-12-05 | 矽力杰半导体技术(杭州)有限公司 | Cell balancing circuit and cell apparatus |
CN105162206B (en) * | 2015-09-30 | 2018-03-23 | 环旭电子股份有限公司 | The charge control method of rechargeable battery |
TWM518824U (en) | 2015-10-14 | 2016-03-11 | Reduce Carbon Energy Develop Co Ltd | Charging device with active charge equalization |
CN105375597A (en) * | 2015-12-08 | 2016-03-02 | 重庆瑞升康博电气有限公司 | Unmanned aerial vehicle intelligent charger |
CN105471033B (en) * | 2015-12-21 | 2018-06-26 | 南京信息职业技术学院 | Intelligent charging method and intelligent charging system based on charging curve |
US20170201101A1 (en) * | 2016-01-12 | 2017-07-13 | Richtek Technology Corporation | Mobile device charger for charging mobile device and related adaptive charging voltage generator |
MY181704A (en) | 2016-02-05 | 2021-01-04 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Charge method, adapter and mobile terminal |
CN105720645A (en) * | 2016-04-11 | 2016-06-29 | 浙江德景电子科技有限公司 | Charging method, charging device and charger |
CN105896670A (en) * | 2016-05-25 | 2016-08-24 | 乐视控股(北京)有限公司 | Charging device and mobile terminal |
CN106021155B (en) | 2016-05-25 | 2018-12-21 | 深圳市昂宇电子有限公司 | A kind of USB power supply port that audio-visual video output can be achieved |
CN105958581B (en) * | 2016-05-31 | 2024-01-09 | 零度智控(北京)智能科技有限公司 | Charging method, charging device and unmanned aerial vehicle |
EP3723231B1 (en) * | 2016-07-26 | 2021-10-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, charging method, and power adapter |
CN106230083B (en) | 2016-08-22 | 2018-12-04 | 维沃移动通信有限公司 | Charger charging circuit, mobile terminal charging circuit, charger and mobile terminal |
CN106208260B (en) | 2016-08-31 | 2018-12-04 | 维沃移动通信有限公司 | A kind of charging circuit, data line and charging interface |
CN209488195U (en) | 2016-10-12 | 2019-10-11 | Oppo广东移动通信有限公司 | Mobile terminal |
-
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US11545841B2 (en) * | 2019-11-18 | 2023-01-03 | Semiconductor Components Industries, Llc | Methods and apparatus for autonomous balancing and communication in a battery system |
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US11498446B2 (en) * | 2020-01-06 | 2022-11-15 | Ford Global Technologies, Llc | Plug-in charge current management for battery model-based online learning |
US20210349505A1 (en) * | 2020-05-07 | 2021-11-11 | Google Llc | Multi-Battery Support for Wearables |
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US11594892B2 (en) | 2020-06-02 | 2023-02-28 | Inventus Power, Inc. | Battery pack with series or parallel identification signal |
US11699908B2 (en) | 2020-06-02 | 2023-07-11 | Inventus Power, Inc. | Large-format battery management system identifies power degradation |
US11476677B2 (en) | 2020-06-02 | 2022-10-18 | Inventus Power, Inc. | Battery pack charge cell balancing |
US11705741B2 (en) | 2020-07-24 | 2023-07-18 | Inventus Power, Inc. | Mode-based disabling of communication bus of a battery management system |
US11828807B2 (en) | 2020-09-01 | 2023-11-28 | Samsung Electronics Co., Ltd. | Method and apparatus with battery state estimation |
US20220065934A1 (en) | 2020-09-01 | 2022-03-03 | Samsung Electronics Co., Ltd. | Method and apparatus with battery state estimation |
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