WO2024016693A1 - 双电池管理电路和电子设备 - Google Patents

双电池管理电路和电子设备 Download PDF

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Publication number
WO2024016693A1
WO2024016693A1 PCT/CN2023/081716 CN2023081716W WO2024016693A1 WO 2024016693 A1 WO2024016693 A1 WO 2024016693A1 CN 2023081716 W CN2023081716 W CN 2023081716W WO 2024016693 A1 WO2024016693 A1 WO 2024016693A1
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WO
WIPO (PCT)
Prior art keywords
battery
pmic
voltage
electronic device
coupled
Prior art date
Application number
PCT/CN2023/081716
Other languages
English (en)
French (fr)
Inventor
毛扬
石聪
张铁利
张长营
Original Assignee
荣耀终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Priority to CN202380008757.2A priority Critical patent/CN116569441A/zh
Publication of WO2024016693A1 publication Critical patent/WO2024016693A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • 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

  • the present application relates to the field of battery charging, and in particular, to a dual battery management circuit and electronic equipment.
  • Embodiments of the present application provide a dual-battery management circuit and electronic device for preventing large currents between two batteries and achieving voltage balance of the two batteries.
  • a dual battery management circuit including: a first power management integrated circuit PMIC and a second PMIC; the first PMIC is used to control the charging and discharging of the first battery and measure the voltage of the first battery; the second PMIC Used to control the charge and discharge of the second battery and measure the voltage of the second battery; the first battery is coupled to the coupling point through the first PMIC, the second battery is coupled to the coupling point through the second PMIC, the coupling point is coupled to the load, and the coupling point is also used to couple to the power supply through the first PMIC and the second PMIC respectively; when the voltage difference between the first battery and the second battery is greater than or equal to the threshold, the first PMIC and the second PMIC are used to: if the power supply is not connected, Then, the first battery and the second battery are connected, and the conduction current between the first battery and the second battery is limited, so that the battery with high voltage performs current-limited charging on the battery with low voltage.
  • the dual battery management circuit compares the voltage difference between the two batteries. When the voltage difference is greater than the threshold, the two batteries are turned on, and the two PMICs control the conduction between the two batteries. The current is passed to limit the current, thereby preventing large currents between the two batteries and achieving voltage balance between the two batteries.
  • the first PMIC and the second PMIC are also used to: if the power supply is connected, stop charging the battery with high voltage. The battery is charged, the current limiting function is turned on, and the battery with low voltage is charged with current limiting. Make the voltage difference between the first battery and the second battery less than the threshold as soon as possible.
  • the first PMIC and the second PMIC are also used to: conduct the first battery and the second battery, and turn off Current limiting function.
  • the two batteries are charged and discharged at the same time to ensure the voltage balance of the two batteries.
  • the battery voltage is too low (for example, 2.4V), which cannot guarantee the normal operation of the entire electronic device and can only guarantee the operation of the PMIC. If the power adapter is plugged in at this time, the battery with a higher voltage can be charged to increase its power supply. voltage, so that the battery can return to the supply voltage (such as 3V) that can ensure the normal operation of the electronic device as soon as possible. Therefore, the function of the comparator is to ensure that the battery with a relatively high voltage can be charged quickly in a scenario where the electronic device is shut down due to battery over-discharge.
  • the first PMIC includes a first switch transistor
  • the second PMIC includes a second switch transistor
  • the first battery is coupled to the coupling point through the first switch transistor
  • the second battery is coupled to the coupling point through the second switch transistor. Coupled to the coupling point.
  • connecting the first battery to the second battery and turning on the current limiting function includes: controlling the first switch tube to be turned on, controlling the second switch tube to be turned on, and controlling the first switch One of the transistors or the second switching transistor is in the linear impedance region.
  • the conduction current of the switch tube can be adjusted, so that the conduction current of the switch tube is limited and controllable, thereby preventing the occurrence of a high voltage between the first battery and the second battery. High Current.
  • the second aspect reminds an electronic device, including a dual battery management circuit as described in the first aspect and any embodiment thereof, a first battery and a second battery.
  • the dual battery management circuit is used to manage the first battery and the second battery. The charge and discharge of the secondary battery are managed.
  • Figure 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of an electronic device provided by an embodiment of the present application, which is a folding screen mobile phone;
  • Figure 3 is a schematic diagram of another electronic device provided by an embodiment of the present application, which is a folding screen mobile phone;
  • Figure 4 is a schematic structural diagram of a dual battery management circuit provided by an embodiment of the present application.
  • Figure 5 is a schematic diagram of the working principle of a dual battery management circuit provided by an embodiment of the present application.
  • Figure 6 is a schematic diagram of a current path provided by an embodiment of the present application.
  • Figure 7 is a schematic diagram of another current path provided by an embodiment of the present application.
  • Figure 8 is a schematic diagram of another current path provided by an embodiment of the present application.
  • Figure 9 is a schematic diagram of yet another current path provided by an embodiment of the present application.
  • Figure 10 is a schematic diagram of yet another current path provided by an embodiment of the present application.
  • Figure 11 is a schematic diagram of yet another current path provided by an embodiment of the present application.
  • Figure 12 is a schematic diagram of yet another current path provided by an embodiment of the present application.
  • FIG. 13 is a schematic diagram of yet another current path provided by an embodiment of the present application.
  • Coupled and “connection” involved in the embodiments of this application should be understood in a broad sense. For example, they may refer to physical direct connections, or they may refer to indirect connections realized through electronic devices, such as resistors, inductors, and capacitors. or other electronic devices.
  • the embodiment of the present application provides an electronic device.
  • the electronic device may be a device with at least two batteries.
  • the electronic device may be mobile or fixed. Electronic devices can be deployed on land (such as indoor or outdoor, handheld or vehicle-mounted, etc.), on water (such as ships, etc.), or in the air (such as aircraft, balloons, satellites, etc.).
  • the electronic equipment may be called user equipment (UE), access terminal, terminal unit, subscriber unit, terminal station, mobile station (MS), mobile station, terminal agent or terminal device, etc. .
  • the electronic device can be a mobile phone, a tablet, a laptop, a smart bracelet, a smart watch, a headset, a smart speaker, a virtual reality (VR) device, an augmented reality (AR) device, an industrial control ( Terminals in industrial control, terminals in self-driving, terminals in remote medical, terminals in smart grid, terminals in transportation safety, smart cities Terminals in (smart city), terminals in smart homes (smart home), etc.
  • VR virtual reality
  • AR augmented reality
  • an industrial control Terminals in industrial control, terminals in self-driving, terminals in remote medical, terminals in smart grid, terminals in transportation safety, smart cities Terminals in (smart city), terminals in smart homes (smart home), etc.
  • the embodiments of the present application do not limit the specific type and structure of the electronic device. A possible structure of the electronic device is described below.
  • FIG. 1 shows a possible structure of the electronic device 101 .
  • the electronic device 101 may include a processor 210, an external memory interface 220, an internal memory 221, a universal serial bus (USB) interface 230, a power management module 240, a battery 241, a wireless charging coil 242, an antenna 1, an antenna 2.
  • Mobile communication module 250 wireless communication module 260, audio module 270, speaker 270A, receiver 270B, microphone 270C, headphone interface 270D, sensor module 280, button 290, motor 291, indicator 292, camera 293, display screen 294 and Subscriber identification module (SIM) card interface 295, etc.
  • SIM Subscriber identification module
  • the sensor module 280 may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, etc.
  • the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the electronic device 101.
  • the electronic device 101 may include more or less components than shown in the figures, or combine some components, or split some components, or arrange different components.
  • the components illustrated may be implemented in hardware, software, or a combination of software and hardware.
  • the processor 210 may include one or more processing units.
  • the processor 210 may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on a chip (system on chip).
  • SoC chip
  • CPU central processing unit
  • AP application processor
  • NP network processor
  • DSP digital signal processor
  • MCU microcontroller Unit
  • PLD programmable logic device
  • modem processor graphics processing unit
  • GPU image signal processor
  • ISP image signal processor
  • Controller video codec
  • baseband processor and neural network processor neural-network processing unit, NPU
  • processor 210 may be an application processor AP.
  • the above-mentioned processor 210 can be integrated in a system on chip (SoC).
  • SoC system on chip
  • the above-mentioned processor 210 may be integrated in an integrated circuit (IC) chip.
  • the processor 210 may include an IC The analog front end (AFE) and micro-controller unit (MCU) in the chip.
  • AFE analog front end
  • MCU micro-controller unit
  • the controller may be the nerve center and command center of the electronic device 101 .
  • the controller can generate operation control signals based on the instruction operation code and timing signals to complete the control of fetching and executing instructions.
  • the processor 210 may also be provided with a memory for storing instructions and data.
  • the memory in processor 210 is cache memory. This memory may hold instructions or data that have been recently used or recycled by processor 210 . If the processor 210 needs to use the instructions or data again, it can be called directly from the memory. Repeated access is avoided and the waiting time of the processor 210 is reduced, thus improving the efficiency of the system.
  • processor 210 may include one or more interfaces.
  • Interfaces can include integrated circuit (inter-integrated circuit, I2C) interface, integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, pulse code modulation (pulse code modulation, PCM) interface, universal asynchronous receiver and transmitter (universal asynchronous receiver/transmitter (UART) interface, mobile industry processor interface (MIPI), general-purpose input/output (GPIO) interface, subscriber identity module (subscriber identity module, SIM) interface and/ Or USB interface, etc.
  • I2C integrated circuit
  • I2S integrated circuit built-in audio
  • PCM pulse code modulation
  • PCM pulse code modulation
  • UART universal asynchronous receiver and transmitter
  • MIPI mobile industry processor interface
  • GPIO general-purpose input/output
  • SIM subscriber identity module
  • SIM subscriber identity module
  • the interface connection relationship between the modules illustrated in the embodiment of the present application is only a schematic explanation and does not constitute a structural limitation on the electronic device 101.
  • the electronic device 101 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.
  • the wireless communication function of the electronic device 101 can be implemented through the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modem processor and the baseband processor.
  • Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals.
  • Each antenna in electronic device 101 may be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve antenna utilization. For example: Antenna 1 can be reused as a diversity antenna for a wireless LAN. In other embodiments, antennas may be used in conjunction with tuning switches.
  • the mobile communication module 250 can provide solutions for wireless communication including 2G/3G/4G/5G applied on the electronic device 101 .
  • the wireless communication module 260 can provide applications on the electronic device 101 including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) network), Bluetooth (bluetooth, BT), and global navigation satellites. Wireless communication solutions such as global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (infrared, IR), etc.
  • WLAN wireless local area networks
  • GNSS global navigation satellite system
  • FM frequency modulation
  • NFC near field communication
  • infrared technology infrared, IR
  • the antenna 1 of the electronic device 101 is coupled to the mobile communication module 250, and the antenna 2 is coupled to the wireless communication module 260, so that the electronic device 101 can communicate with the network and other devices through wireless communication technology.
  • the external memory interface 220 can be used to connect an external memory card, such as a micro SanDisk (Micro SD) card, to expand the storage capacity of the electronic device 101.
  • the external memory card communicates with the processor 210 through the external memory interface 220 to implement the data storage function. Such as saving music, videos, etc. files in external memory card.
  • Internal memory 221 may be used to store computer executable program code, which includes instructions.
  • the processor 210 executes instructions stored in the internal memory 221 to execute various functional applications and data processing of the electronic device 101 .
  • the internal memory 221 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc.
  • the memory involved in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include a volatile memory. Both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate SDRAM double data rate SDRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • direct rambus RAM direct rambus RAM
  • the electronic device 101 can implement audio functions through the audio module 270, the speaker 270A, the receiver 270B, the microphone 270C, the headphone interface 270D, and the application processor. Such as music playback, recording, etc.
  • the audio module 270 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals.
  • the audio module 270 may be provided in the processor 210 , or some functional modules of the audio module 270 may be provided in the processor 210 .
  • Speaker 270A also called “speaker” is used to convert audio electrical signals into sound signals.
  • Receiver 270B also called “earpiece”, is used to convert audio electrical signals into sound signals.
  • Microphone 270C also called “microphone” or “microphone” is used to convert sound signals into electrical signals.
  • the electronic device 101 may be provided with at least one microphone 270C.
  • the headphone interface 270D is used to connect wired headphones.
  • the headphone interface 270D can be a USB interface 230, or a 3.5mm open mobile terminal platform (OMTP) standard interface, or a cellular telecommunications industry association of the USA (CTIA) standard interface.
  • OMTP open mobile terminal platform
  • CTIA cellular
  • the buttons 290 include a power button, a volume button, etc.
  • Key 290 may be a mechanical key. It can also be a touch button.
  • the electronic device 101 may receive key input and generate key signal input related to user settings and function control of the electronic device 101 .
  • the motor 291 can generate vibration prompts.
  • the motor 291 can be used for vibration prompts for incoming calls and can also be used for touch vibration feedback.
  • the indicator 292 may be an indicator light, which may be used to indicate charging status, power changes, or may be used to indicate messages, missed calls, notifications, etc.
  • the SIM card interface 295 is used to connect a SIM card.
  • the SIM card can be connected to or separated from the electronic device 101 by inserting it into the SIM card interface 295 or pulling it out from the SIM card interface 295 .
  • the electronic device 101 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1.
  • the SIM card interface 295 can support SIN (Nano SIM) cards, micro SIM (Micro SIM) cards, SIM cards, etc.
  • the electronic device 101 uses an embedded SIM (eSIM) card.
  • the eSIM card can be embedded in the electronic device 101 and cannot be separated from the electronic device 101.
  • the electronic device 101 can implement the shooting function through an ISP, a camera 293, a video codec, a GPU, a display screen 294, an application processor, and the like.
  • the ISP is used to process the data fed back by the camera 293.
  • the ISP may be provided in the camera 293.
  • Camera 293 is used to capture still images or video.
  • the electronic device 101 may include 1 or N cameras 293, where N is a positive integer greater than 1.
  • the electronic device 101 can implement display functions through a GPU, a display screen 294, an application processor, and the like.
  • the GPU is an image processing microprocessor and is connected to the display screen 294 and the application processor. GPU is used to perform mathematical and geometric calculations Computational, used for graphics rendering.
  • Processor 210 may include one or more GPUs that execute program instructions to generate or alter display information.
  • the display screen 294 is used to display images, videos, etc.
  • Display 294 includes a display panel.
  • electronic device 101 may include one or more display screens 294.
  • the touch screen in the display screen 294 may be a folding screen.
  • the display panel of the display screen 294 may include a first touch area 31 and a second touch area 32.
  • the first touch area 31 and the second touch area 32 may be located on different planes, wherein the display screen 294 in FIG. 2 is folded outward, so that the first touch area 31 and the second touch area 32 are visible to the user after being folded, and the user can still view the display.
  • the display screen 294 in Figure 3 is folded inward, so that the first touch area 31 and the second touch area 32 face each other after being completely folded, which is beneficial to protecting the display panel of the display screen 294.
  • the display screen 294 provided by the embodiment of the present application can be an outward-folding folding screen as shown in FIG. 2 , and can also be applied to an inward-folding folding screen as shown in FIG. 3 .
  • the battery 241 may include at least two batteries, and the two batteries are respectively located in two touch areas of the display screen 294.
  • the power management module 240 is used to receive charging input from the charger.
  • the charger may be a wireless charger (such as a wireless charging base of the electronic device 101 or other devices that can wirelessly charge the electronic device 101), or a wired charger.
  • the power management module 240 may receive charging input from a wired charger through the USB interface 230 .
  • the power management module 240 may receive wireless charging input through the wireless charging coil 242 of the electronic device.
  • the power management module 240 can also provide power for electronic devices while charging the battery 241 .
  • the power management module 240 receives input from the battery 241 and supplies power to the processor 210, internal memory 221, external memory interface 220, display screen 294, camera 293, wireless communication module 260, etc.
  • the power management module 240 can also be used to monitor the battery capacity, battery cycle times, battery health status (leakage, impedance) and other parameters of the battery 241.
  • the power management module 240 may also be provided in the processor 210 .
  • the power management module 240 includes dual battery management circuits for charging two batteries respectively.
  • the current two batteries will inevitably have a voltage difference during production and use. When the voltage difference is large, a large current will be generated between the two batteries, and there is a risk of damaging the battery and power management chip.
  • the dual battery management circuit provided in the embodiment of the present application compares the voltage difference of the two batteries. When the voltage difference is greater than the threshold, if it is a non-charging scenario, the battery with high voltage is controlled to charge the battery with low voltage to reach the voltage. The difference is less than the threshold. If it is a charging scenario, the battery with a low voltage is controlled to be charged first until the voltage difference is less than the threshold. It should be noted that this application takes two batteries as an example for explanation, and can also be applied to scenarios with more batteries.
  • the dual battery management circuit 40 includes: a first over voltage protection (OVP) circuit 401, a second OVP circuit 402, a first power management integrated circuit (power management integrated circuit) circuit, PMIC) 403, the second PMIC 404, and the comparator 405. It also includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, inductor L1, and inductor L2.
  • the capacitor C1 is used to filter the charging current input to the first PMIC 403
  • the capacitor C2 is used to filter the charging current input to the second PMIC 404 .
  • the inductor L1 and the capacitor C3 are used to filter the charging current output by the first PMIC 403 to the load 45 and the first battery 43.
  • the inductor L2 and the capacitor C4 are used to charge the second PMIC 404 output to the load 45 and the second battery 44. The current is filtered.
  • One end of the first OVP circuit 401 and one end of the second OVP circuit 402 can be coupled to the power adapter 41 (which can be referred to as the power supply) through a USB interface.
  • the other end of the first OVP circuit 401 is coupled to the first PMIC 403.
  • the second OVP circuit 402 The other end is coupled to the second PMIC 404.
  • the first OVP circuit 401 is used for overvoltage protection of the first PMIC 403, and the second OVP circuit 402 is used for overvoltage protection of the second PMIC 404.
  • the first battery 43 is coupled to the coupling point N through the first PMIC 403
  • the second battery 44 is coupled to the coupling point N through the second PMIC 404
  • the coupling point N is coupled to the load 45
  • the coupling point N is also used to pass through the first PMIC 403 respectively.
  • second PMIC 404 coupled to power adapter 41 (i.e., power supply).
  • the first PMIC 403 is used to control the charge and discharge of the first battery 43, measure the voltage of the first battery 43, and provide power to the load 45.
  • the second PMIC 404 is used to control the charge and discharge of the second battery 44, measure the voltage of the second battery 44, and provide power to the load 45.
  • the first PMIC 403 includes a switching transistor Q11, a first voltage conversion circuit and a switching transistor Q14.
  • the first voltage conversion circuit includes a switching transistor Q12 and a switching transistor Q13.
  • the first voltage conversion circuit may be a buck circuit, a boost circuit, a buck-boost circuit, etc.
  • the first voltage conversion circuit is named after the USB_IN1 port.
  • For the input port take the VSW1 port as the output port as an example.
  • the first voltage conversion circuit is a buck circuit.
  • the first voltage conversion circuit is a boost circuit.
  • the USB_IN1 pin is used to input charging current.
  • the USB_IN1 pin is coupled to the PMID1 pin through the switch Q11, and the PMID1 pin is coupled to the capacitor C1, thereby filtering the charging current input to the first PMIC 403.
  • the PMID1 pin is coupled to the VSW1 pin through the switch Q12, the VSW1 pin is grounded through the switch Q13, the VPH_PW1 pin is coupled to the VCHG_OUT1 pin through the switch Q14, and the VCHG_OUT1 pin is coupled to the first battery 43 and the comparator 405.
  • the first PMIC 403 controls the electrical connection between the first voltage conversion circuit and the USB_IN1 pin by controlling the on and off of the switch Q11.
  • the first PMIC 403 adjusts the output charging voltage and charging current by controlling the duty cycle of the switching tube Q12 and the switching tube Q13.
  • the VSW1 pin is coupled to the inductor L1 and the capacitor C3, and is used to filter the charging current output by the first PMIC 403 to the load 45 and the first battery 43.
  • the second PMIC 404 includes a switching transistor Q21, a second voltage conversion circuit and a switching transistor Q24.
  • the second voltage conversion circuit includes a switching transistor Q22 and a switching transistor Q23.
  • the second voltage conversion circuit may be a buck circuit, a boost circuit, a buck-boost circuit, etc.
  • the second voltage conversion circuit is named after the USB_IN2 port.
  • the VSW2 port is used as the output port as an example.
  • the second voltage conversion circuit is a buck circuit.
  • the second voltage conversion circuit is a boost circuit.
  • the USB_IN2 pin is used to input charging current.
  • the USB_IN2 pin is coupled to the PMID2 pin through the switch Q21, and the PMID2 pin is coupled to the capacitor C2 to filter the charging current input to the second PMIC 404.
  • the PMID2 pin is coupled to the VSW2 pin through the switch Q22, the VSW2 pin is grounded through the switch Q23, the VPH_PW2 pin is coupled to the VCHG_OUT2 pin through the switch Q24, and the VCHG_OUT2 pin is coupled to the second battery 44 and the comparator 405.
  • the second PMIC 404 controls the electrical connection between the second voltage conversion circuit and the USB_IN2 pin by controlling the on and off of the switch Q21.
  • the second PMIC 404 adjusts the output charging voltage and charging current by controlling the duty cycle of the switching tube Q22 and the switching tube Q23.
  • the VSW2 pin is coupled to the inductor L2 and capacitor C4 for The charging current output by the second PMIC 404 to the load 45 and the second battery 44 is filtered.
  • the VPH_PW1 pin of the first PMIC 403 is coupled to the VPH_PW2 pin of the second PMIC 404, so that the first battery 43 and the second battery 44 can be connected in parallel.
  • the first PMIC 403 and the second PMIC 404 can be connected through an internal integrated circuit (inter-integrated circuit, I2C) bus, a serial peripheral interface (serial peripheral interface, SPI) bus, signal processing and multimedia image (signal processing and multimedia) image, SPMI) bus, etc. to communicate.
  • I2C internal integrated circuit
  • SPI serial peripheral interface
  • SPMI signal processing and multimedia image
  • One of the PMICs can serve as the master PMIC
  • the other PMIC can serve as the slave PMIC.
  • the master PMIC can notify the slave PMIC to turn on a certain function of a certain pin, and the slave PMIC can notify the master PMIC of the battery voltage measured by the slave PMIC through the VCHG_OUT pin.
  • the comparator 405 is used to compare the voltages of the first battery 43 and the second battery 44, and output an enable signal to the first PMIC 403 or the second PMIC 404.
  • the enable signal is used to instruct the PMIC to turn on the corresponding battery. charging function.
  • the working principle of the dual battery management circuit 40 is as follows:
  • the comparator 405 compares the voltages of the first battery 43 and the second battery 44, and outputs an enable signal to the PMIC coupled to the battery with the higher voltage to instruct the corresponding PMIC to turn on the charging function of the battery with the higher voltage.
  • the comparator 405 outputs an enable signal to the first PMIC 403 to instruct the first PMIC 403 to turn on charging.
  • the first PMIC 403 turns on the switching tube Q11, the switching tube Q12, and the switching tube Q14, so that the charging current can be output to the first battery 43 to charge the first battery 43.
  • the comparator 405 outputs an enable signal to the second PMIC 404 to instruct the second PMIC 404 to turn on charging.
  • the second PMIC 404 turns on the switch tube Q21, the switch tube Q22, and the switch tube Q24, so that the charging current can be output to the second battery 44 to charge the second battery 44.
  • the battery voltage is too low (for example, 2.4V), which cannot guarantee the normal operation of the entire electronic device and can only guarantee the operation of the PMIC.
  • the power adapter 41 is plugged in at this time, the battery with a higher voltage can be charged to increase its supply voltage, so that the battery can quickly return to a supply voltage that can ensure the normal operation of the electronic device (for example, 3V). Therefore, the function of the comparator 405 is to ensure that the battery with a relatively high voltage can be charged quickly in a scenario where the electronic device is shut down due to over-discharge of the battery.
  • This application takes the first PMIC 403 turning on the charging function as an example to illustrate.
  • the first PMIC 403 serves as the master PMIC and the second PMIC 404 serves as the slave PMIC, but it is not intended to be limited to this.
  • the first PMIC 403 detects whether the start is triggered by plugging in the power adapter 41 or by long pressing the power button.
  • the first PMIC 403 will detect the power on at the pin coupled to the power button (not shown in the figure). signal, steps S103-S104 are executed at this time. If the boot is triggered by plugging in the power adapter 41 (that is, charging the battery), the first PMIC 403 will detect a higher charging voltage at the USB_IN1 pin and perform the steps S105-S106.
  • the first PMIC 403 and the second PMIC 404 will The first battery 43 and the second battery 44 are electrically connected, so that the first battery 43 and the second battery 44 are discharged in parallel.
  • the first PMIC 403 can obtain the voltage VBAT1 of the first battery 43 by measuring the voltage of the VCHG_OUT1 pin
  • the second PMIC 404 can obtain the voltage VBAT1 of the first battery 43 by measuring the VCHG_OUT2 tube. pin voltage to obtain the voltage VBAT2 of the second battery 44, and then send the voltage VBAT2 of the second battery 44 to the first PMIC 403, and the first PMIC 403 compares the voltage VBAT1 of the first battery 43 with the voltage VBAT2 of the second battery 44 voltage difference between them.
  • the first PMIC 403 turns on the switch transistor Q14 and is in the saturation zone.
  • the first PMIC 403 instructs the second PMIC 404 to turn on the switch transistor Q24 and is in the saturation zone.
  • the first battery 43 and the second battery 44 are connected in parallel and the switch tube is in saturation.
  • the conduction current reaches the maximum when the battery reaches the maximum value (that is, the conduction current no longer increases with the increase of the gate voltage).
  • the discharge current of the battery is not limited, that is, the current limiting function is turned off, so that the battery can normally supply power to the load.
  • the first PMIC 403 can turn off the switching tube Q11 and the switching tube Q12
  • the second PMIC 404 can turn off the switching tube Q21 and the switching tube Q22
  • the parallel-connected first battery 43 and the second battery 44 can jointly turn off the switching tube Q11 and the switching tube Q12. Load 45 is powered.
  • the switch tube Q14 and the switch tube Q24 are always turned on.
  • the voltage difference between the first battery 43 and the second battery 44 is very small, and they can be discharged synchronously. No large current will be generated during the operation, and the battery or PMIC will not be damaged.
  • the first PMIC 403 and the second PMIC 404 connect the first battery 43 and the second battery 44 Turning on, the first PMIC 403 or the second PMIC 404 limits the conduction current between the first battery 43 and the second battery 44, so that the battery with a high voltage performs current-limiting charging on the battery with a low voltage until the first battery 43
  • the voltage difference between the voltage VBAT1 and the voltage VBAT2 of the second battery 44 is less than the threshold value ⁇ Vth.
  • the first PMIC 403 turns on the switch Q14
  • the second PMIC 404 turns on the switch Q24
  • the first PMIC 403 turns on the switch Q14 and is in the saturation zone, and instructs the second PMIC 404 to turn on the switch Q24 and is in the linear impedance zone.
  • the first battery 43 not only supplies power to the load 45, but also charges the second battery 44 in a current limiting manner.
  • the voltage difference between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 will gradually decrease until the voltage between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 is If the difference is less than the threshold ⁇ Vth, step S103 will continue.
  • the first PMIC 403 turns on the switch Q14 and is in the linear impedance region, and instructs the second PMIC 404 to turn on the switch Q24 and is in the saturation region.
  • the second battery 44 not only supplies power to the load 45, but also charges the first battery 43 in a current limiting manner.
  • the voltage difference between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 will gradually decrease until the voltage between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 is If the difference is less than the threshold ⁇ Vth, step S103 will continue.
  • the first PMIC 403 and the second PMIC 404 will The first battery 43 and the second battery 44 are electrically connected, so that the first battery 43 and the second battery 44 are charged in parallel.
  • the first PMIC 403 turns on the switch transistor Q14 and is in the saturation zone.
  • the first PMIC 403 instructs the second PMIC 404 to turn on the switch transistor Q24 and is in the saturation zone.
  • the first battery 43 and the second battery 44 are connected in parallel and the switch tube is in saturation.
  • the conduction current reaches the maximum when the gate voltage reaches the maximum (that is, the conduction current no longer increases with the increase of the gate voltage).
  • the charging current of the battery is not limited, that is, the current limiting function is turned off, so that the battery can be charged as quickly as possible.
  • the first PMIC 403 and the second PMIC 404 not only supply power to the load 45, but also charge the first battery 43 and the second battery 44 at the same time.
  • the switching tube Q14 and the switching tube Q24 are always turned on.
  • the voltage difference between the first battery 43 and the second battery 44 is very small, and they can be charged simultaneously without generating a large current between each other. , will not damage the battery or PMIC.
  • the corresponding PMIC can turn off the function of charging the battery (i.e., turn off the switch Q14 or Q24), and the two PMICs can continue to charge the other unfilled battery until both All batteries are fully charged, which solves the problem that a certain battery cannot be fully charged in a single PMIC solution with multiple batteries.
  • the PMIC corresponding to the battery with a higher voltage stops charging the battery with a lower voltage.
  • the PMIC corresponding to the battery turns on the current limiting (regulation) function, and the first PMIC 403 and the second PMIC 404 jointly charge the low-voltage battery in a current limiting manner.
  • the first PMIC 403 turns off the switch Q14, and instructs the second PMIC 404 to turn on the switch Q24 and is in the linear impedance region.
  • the first PMIC 403 and the second PMIC 404 jointly charge the second battery 44 in a current limiting manner.
  • the voltage difference between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 will gradually decrease until the voltage between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 is If the difference is less than the threshold ⁇ Vth, step S105 will continue.
  • the first PMIC 403 turns on the switch Q14 and is in the linear impedance region, and instructs the second PMIC 403 to turn off the switch Q24.
  • the first PMIC 403 and the second PMIC 404 jointly charge the first battery 43 in a current limiting manner.
  • the voltage difference between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 will gradually decrease until the voltage between the voltage VBAT1 of the first battery 43 and the voltage VBAT2 of the second battery 44 is If the difference is less than the threshold ⁇ Vth, step S105 will continue.
  • the dual battery management circuit and electronic device provided by the embodiment of the present application compare the voltage difference between the two batteries. When the voltage difference is greater than the threshold, the two batteries are turned on, and the two PMICs are connected to each other. The conduction current between the two batteries is limited to prevent large currents between the two batteries and achieve voltage balance between the two batteries.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of modules is only a logical function division. In actual implementation, there may be other division methods.
  • multiple modules or components may be combined or can be integrated into another device, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or modules, which may be in electrical, mechanical or other forms.
  • modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located on one device, or they may be distributed to multiple devices. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional module in each embodiment of the present application can be integrated in one device, or each module can exist physically alone, or two or more modules can be integrated in one device.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • computer program instructions When computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transferred from a website, computer, server, or data center Transmission to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or include one or more data storage devices such as servers and data centers that can be integrated with the medium.
  • the available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), etc.

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Abstract

本申请公开了一种双电池管理电路和电子设备，涉及电池充电领域，用于防止两个电池之间产生大电流，并实现两个电池的电压均衡。双电池管理电路包括：第一PMIC和第二PMIC；第一PMIC控制第一电池的充放电以及测量第一电池的电压，第二PMIC控制第二电池的充放电以及测量第二电池的电压；第一电池通过第一PMIC并且第二电池通过第二PMIC耦合至耦合点，耦合点耦合至负载以及分别通过第一PMIC和第二PMIC耦合至电源；当第一电池与第二电池之间的电压差大于或等于阈值时，第一PMIC和第二PMIC用于：如果未接入电源，则将第一电池与第二电池导通，并限制第一电池与第二电池之间的导通电流。

Description

双电池管理电路和电子设备
本申请要求于2022年7月22日提交国家知识产权局、申请号为202221920460.2、发明名称为“双电池管理电路和电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池充电领域，尤其涉及一种双电池管理电路和电子设备。
背景技术
目前有一些手机采用双电池管理电路来提升电池的充放电效率，但是由于两个电池在生产、使用过程中必然会出现电压差，当电压差较大时会产生两个电池之间的大电流，存在烧毁电池的风险。
发明内容
本申请实施例提供一种双电池管理电路和电子设备，用于防止两个电池之间产生大电流，并实现两个电池的电压均衡。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种双电池管理电路，包括：第一电源管理集成电路PMIC和第二PMIC；第一PMIC用于控制第一电池的充放电以及测量第一电池的电压，第二PMIC用于控制第二电池的充放电以及测量第二电池的电压；第一电池通过第一PMIC耦合至耦合点，第二电池通过第二PMIC耦合至耦合点，耦合点耦合至负载，耦合点还用于分别通过第一PMIC和第二PMIC耦合至电源；当第一电池与第二电池之间的电压差大于或等于阈值时，第一PMIC和第二PMIC用于：如果未接入电源，则将第一电池与第二电池导通，并限制第一电池与第二电池之间的导通电流，使得电压高的电池对电压低的电池进行限流充电。
本申请实施例提供的双电池管理电路，通过比较两个电池之间的电压差，当电压差大于阈值时，将两个电池导通，并且，这两个PMIC对两个电池之间的导通电流进行限流，从而防止两个电池之间产生大电流，并实现两个电池的电压均衡。
在一种可能的实施方式中，当第一电池与第二电池之间的电压差大于或等于阈值时，第一PMIC和第二PMIC还用于：如果接入电源，则停止对电压高的电池进行充电，打开限流功能，对电压低的电池进行限流充电。尽快使得第一电池与第二电池之间的电压差小于阈值。
在一种可能的实施方式中，当第一电池与第二电池之间的电压差小于阈值时，第一PMIC和第二PMIC还用于：将第一电池与第二电池导通，并且关闭限流功能。使得两个电池同时进行充放电，以保证两个电池的电压均衡。
在一种可能的实施方式中，还包括比较器，比较器，用于比较第一电池的电压以及第二电池的电压，并向电压高的电池所对应的PMIC输出使能信号，使能信号用于指示对应的PMIC打开对电压高的电池的充电功能。对于电池过放导致电子设备关机的场景，电池电压过低(例如2.4V)无法保证整个电子设备的正常运行，仅能保证PMIC的工作。如果此时插入电源适配器，可以对电压较高的电池进行充电以提高其供电电 压，使得电池尽快恢复至能够保证电子设备正常运行的供电电压(例如3V)。因此，比较器的作用是保证在电池过放导致电子设备关机的场景下，电压相对较高的电池可以快速被充电。
在一种可能的实施方式中，第一PMIC中包括第一开关管，第二PMIC中包括第二开关管，第一电池通过第一开关管耦合至耦合点，第二电池通过第二开关管耦合至耦合点。该实施方式提供了第一电池和第二电池如何并联的一种方案。
在一种可能的实施方式中，将第一电池与第二电池导通，并打开限流功能，包括：控制第一开关管导通，并控制第二开关管导通，并且控制第一开关管或第二开关管中的一个处于线性阻抗区。通过调节处于线性阻抗区的开关管的等效阻值，即可以调节开关管的导通电流，使得开关管的导通电流受限可控，从而防止第一电池与第二电池之间产生较大电流。
第二方面，提醒了一种电子设备，包括如第一方面及其任一实施方式所述的双电池管理电路、第一电池和第二电池，双电池管理电路用于对第一电池和第二电池的充放电进行管理。
第二方面的技术效果参照第一方面及其任一实施方式的技术效果，在此不再重复。
附图说明
图1为本申请实施例提供的一种电子设备的结构示意图；
图2为本申请实施例提供的一种电子设备为折叠屏手机的示意图；
图3为本申请实施例提供的另一种电子设备为折叠屏手机的示意图；
图4为本申请实施例提供的一种双电池管理电路的结构示意图；
图5为本申请实施例提供的一种双电池管理电路的工作原理的示意图；
图6为本申请实施例提供的一种电流通路的示意图；
图7为本申请实施例提供的另一种电流通路的示意图；
图8为本申请实施例提供的又一种电流通路的示意图；
图9为本申请实施例提供的再一种电流通路的示意图；
图10为本申请实施例提供的再一种电流通路的示意图；
图11为本申请实施例提供的再一种电流通路的示意图；
图12为本申请实施例提供的再一种电流通路的示意图；
图13为本申请实施例提供的再一种电流通路的示意图。
具体实施方式
首先对本申请涉及的一些概念进行描述。
本申请实施例涉及的术语“第一”、“第二”等仅用于区分同一类型特征的目的，不能理解为用于指示相对重要性、数量、顺序等。
本申请实施例涉及的术语“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
本申请实施例涉及的术语“耦合”、“连接”应做广义理解，例如，可以指物理上的直接连接，也可以指通过电子器件实现的间接连接，例如通过电阻、电感、电容 或其他电子器件实现的连接。
本申请实施例提供了一种电子设备，该电子设备可以是一种具有至少两个电池的设备，电子设备可以是移动的，也可以是固定的。电子设备可以部署在陆地上(例如室内或室外、手持或车载等)，也可以部署在水面上(例如轮船等)，还可以部署在空中(例如飞机、气球和卫星等)。该电子设备可以称为用户设备(user equipment，UE)、接入终端、终端单元、用户单元(subscriber unit)、终端站、移动站(mobile station，MS)、移动台、终端代理或终端装置等。例如，该电子设备可以是手机、平板电脑、笔记本电脑、智能手环、智能手表、耳机、智能音箱、虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的终端、无人驾驶(self driving)中的终端、远程医疗(remote medical)中的终端、智能电网(smart grid)中的终端、运输安全(transportation safety)中的终端、智慧城市(smart city)中的终端、智慧家庭(smart home)中的终端等。本申请实施例对电子设备的具体类型和结构等不作限定。下面对电子设备的一种可能结构进行说明。
以电子设备为手机为例，图1示出了电子设备101的一种可能的结构。该电子设备101可以包括处理器210、外部存储器接口220、内部存储器221、通用串行总线(universal serial bus，USB)接口230、电源管理模块240、电池241、无线充电线圈242、天线1、天线2、移动通信模块250、无线通信模块260、音频模块270、扬声器270A、受话器270B、麦克风270C、耳机接口270D、传感器模块280、按键290、马达291、指示器292、摄像头293、显示屏294以及用户标识模块(subscriber identification module，SIM)卡接口295等。
其中，传感器模块280可以包括压力传感器、陀螺仪传感器、气压传感器、磁传感器、加速度传感器、距离传感器、接近光传感器、指纹传感器、温度传感器、触摸传感器、环境光传感器、骨传导传感器等。
可以理解的是，本申请实施例示意的结构并不构成对电子设备101的具体限定。在本申请另一些实施例中，电子设备101可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
处理器210可以包括一个或多个处理单元，例如：处理器210可以为现场可编程门阵列(field programmable gate array，FPGA)、专用集成电路(application specific integrated circuit，ASIC)、片上系统(system on chip，SoC)、中央处理单元(central processing unit，CPU)、应用处理器(application processor，AP)、网络处理器(network processor，NP)、数字信号处理器(digital signal processor，DSP)、微控制单元(micro controller unit，MCU)、可编程逻辑器件(programmable logic device，PLD)、调制解调处理器、图形处理器(graphics processing unit，GPU)、图像信号处理器(image signal processor，ISP)、控制器、视频编解码器、基带处理器以及神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。例如，处理器210可以是应用处理器AP。或者，上述处理器210可以集成在片上系统(system on chip，SoC)中。或者，上述处理器210可以集成在集成电路(integrated circuit，IC)芯片中。该处理器210可以包括IC 芯片中的模拟前端(analog front end，AFE)和微控制单元(micro-controller unit，MCU)。
其中，控制器可以是电子设备101的神经中枢和指挥中心。控制器可以根据指令操作码和时序信号，产生操作控制信号，完成取指令和执行指令的控制。
处理器210中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器210中的存储器为高速缓冲存储器。该存储器可以保存处理器210刚用过或循环使用的指令或数据。如果处理器210需要再次使用该指令或数据，可从所述存储器中直接调用。避免了重复存取，减少了处理器210的等待时间，因而提高了系统的效率。
在一些实施例中，处理器210可以包括一个或多个接口。接口可以包括集成电路(inter-integrated circuit，I2C)接口、集成电路内置音频(inter-integrated circuit sound，I2S)接口、脉冲编码调制(pulse code modulation，PCM)接口、通用异步收发传输器(universal asynchronous receiver/transmitter，UART)接口、移动产业处理器接口(mobile industry processor interface，MIPI)、通用输入输出(general-purpose input/output，GPIO)接口、用户标识模块(subscriber identity module，SIM)接口和/或USB接口等。
可以理解的是，本申请实施例示意的各模块间的接口连接关系，只是示意性说明，并不构成对电子设备101的结构限定。在本申请另一些实施例中，电子设备101也可以采用上述实施例中不同的接口连接方式，或多种接口连接方式的组合。
电子设备101的无线通信功能可以通过天线1、天线2、移动通信模块250、无线通信模块260、调制解调处理器以及基带处理器等实现。
天线1和天线2用于发射和接收电磁波信号。电子设备101中的每个天线可用于覆盖单个或多个通信频带。不同的天线还可以复用，以提高天线的利用率。例如：可以将天线1复用为无线局域网的分集天线。在另外一些实施例中，天线可以和调谐开关结合使用。
移动通信模块250可以提供应用在电子设备101上的包括2G/3G/4G/5G等无线通信的解决方案。无线通信模块260可以提供应用在电子设备101上的包括无线局域网(wireless local area networks，WLAN)(如无线保真(wireless fidelity，Wi-Fi)网络)、蓝牙(bluetooth，BT)、全球导航卫星系统(global navigation satellite system，GNSS)、调频(frequency modulation，FM)、近距离无线通信技术(near field communication，NFC)、红外技术(infrared，IR)等无线通信的解决方案。在一些实施例中，电子设备101的天线1和移动通信模块250耦合，天线2和无线通信模块260耦合，使得电子设备101可以通过无线通信技术与网络以及其他设备通信。
外部存储器接口220可以用于连接外部存储卡，例如微闪迪(micro SanDisk，Micro SD)卡，实现扩展电子设备101的存储能力。外部存储卡通过外部存储器接口220与处理器210通信，实现数据存储功能。例如将音乐，视频等文件保存在外部存储卡中。
内部存储器221可以用于存储计算机可执行程序代码，所述可执行程序代码包括指令。处理器210通过运行存储在内部存储器221的指令，从而执行电子设备101的各种功能应用以及数据处理。此外，内部存储器221可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、通用闪存存储器(universal flash storage，UFS)等。
本申请实施例涉及的存储器可以是易失性存储器或非易失性存储器，或可包括易 失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
电子设备101可以通过音频模块270、扬声器270A、受话器270B、麦克风270C、耳机接口270D以及应用处理器等实现音频功能。例如音乐播放，录音等。
音频模块270用于将数字音频信息转换成模拟音频信号输出，也用于将模拟音频输入转换为数字音频信号。在一些实施例中，音频模块270可以设置于处理器210中，或将音频模块270的部分功能模块设置于处理器210中。扬声器270A，也称“喇叭”，用于将音频电信号转换为声音信号。受话器270B，也称“听筒”，用于将音频电信号转换成声音信号。麦克风270C，也称“话筒”，“传声器”，用于将声音信号转换为电信号。电子设备101可以设置至少一个麦克风270C。耳机接口270D用于连接有线耳机。耳机接口270D可以是USB接口230，也可以是3.5mm的开放移动终端平台(open mobile terminal platform，OMTP)标准接口，美国蜂窝电信工业协会(cellular telecommunications industry association of the USA，CTIA)标准接口。
按键290包括开机键、音量键等。按键290可以是机械按键。也可以是触摸式按键。电子设备101可以接收按键输入，产生与电子设备101的用户设置以及功能控制有关的键信号输入。马达291可以产生振动提示。马达291可以用于来电振动提示，也可以用于触摸振动反馈。指示器292可以是指示灯，可以用于指示充电状态，电量变化，也可以用于指示消息、未接来电、通知等。SIM卡接口295用于连接SIM卡。SIM卡可以通过插入SIM卡接口295，或从SIM卡接口295拔出，实现和电子设备101的接触和分离。电子设备101可以支持1个或N个SIM卡接口，N为大于1的正整数。SIM卡接口295可以支持纳SIN(Nano SIM)卡、微SIM(Micro SIM)卡、SIM卡等。在一些实施例中，电子设备101采用嵌入式(embedded SIM，eSIM)卡，eSIM卡可以嵌在电子设备101中，不能和电子设备101分离。
电子设备101可以通过ISP、摄像头293、视频编解码器、GPU、显示屏294以及应用处理器等实现拍摄功能。ISP用于处理摄像头293反馈的数据。在一些实施例中，ISP可以设置在摄像头293中。摄像头293用于捕获静态图像或视频。在一些实施例中，电子设备101可以包括1个或N个摄像头293，N为大于1的正整数。
电子设备101可以通过GPU、显示屏294以及应用处理器等实现显示功能。GPU为图像处理的微处理器，连接显示屏294和应用处理器。GPU用于执行数学和几何计 算，用于图形渲染。处理器210可包括一个或多个GPU，其执行程序指令以生成或改变显示信息。
显示屏294用于显示图像，视频等。显示屏294包括显示面板。在一些实施方式中，电子设备101可以包括1个或多个显示屏294。在另一些实施方式中，显示屏294中的触控屏可以为折叠屏。示例性的，如图2和图3中所示，显示屏294的显示面板可以包括第一触控区域31和第二触控区域32，当显示屏294进行折叠时，第一触控区域31和第二触控区域32可以位于不同平面，其中，图2中的显示屏294向外折叠，使得折叠后第一触控区域31和第二触控区域32对用户可见，用户仍可以对显示屏294进行触控操作，图3中的显示屏294向内折叠，使得完全折叠后第一触控区域31和第二触控区域32相对，有利于保护显示屏294的显示面板。本申请实施例提供的显示屏294可以为图2所示的向外折叠的折叠屏，还可以应用于图3所示的向内折叠的折叠屏。
电池241可以包括至少两个电池，这两个电池分别位于显示屏294的两个触控区域中。
电源管理模块240用于从充电器接收充电输入。其中，充电器可以是无线充电器(如电子设备101的无线充电底座或者其他可以为电子设备101无线充电的设备)，也可以是有线充电器。例如，电源管理模块240可以通过USB接口230接收有线充电器的充电输入。电源管理模块240可以通过电子设备的无线充电线圈242接收无线充电输入。
其中，电源管理模块240为电池241充电的同时，还可以为电子设备供电。电源管理模块240接收电池241的输入，为处理器210、内部存储器221、外部存储器接口220、显示屏294、摄像头293和无线通信模块260等供电。电源管理模块240还可以用于监测电池241的电池容量、电池循环次数、电池健康状态(漏电、阻抗)等参数。在其他一些实施例中，电源管理模块240也可以设置于处理器210中。
电源管理模块240中包括双电池管理电路，用于分别对两个电池进行充电。目前的两个电池在生产、使用过程中必然会出现电压差，当电压差较大时会在两个电池之间产生较大电流，存在损坏电池和电源管理芯片的风险。针对该问题，本申请实施例提供的双电池管理电路通过比较两个电池的电压差，在电压差大于阈值时，如果是非充电场景，则控制电压高的电池向电压低的电池充电以达到电压差小于阈值，如果是充电场景，则控制先对电压低的电池进行充电以达到电压差小于阈值。需要说明的是，本申请以两个电池为例进行说明，还可以应用于更多电池的场景。
如图4所示，本申请实施例提供的双电池管理电路40包括：第一过压保护(over voltage protection，OVP)电路401、第二OVP电路402、第一电源管理集成电路(power management integrated circuit，PMIC)403、第二PMIC 404、比较器405。还包括电容C1、电容C2、电容C3、电容C4、电感L1、电感L2。电容C1用于对输入第一PMIC 403的充电电流进行滤波，电容C2用于对输入第二PMIC 404的充电电流进行滤波。电感L1和电容C3用于对第一PMIC 403向负载45和第一电池43输出的充电电流进行滤波，电感L2和电容C4用于对第二PMIC 404向负载45和第二电池44输出的充电电流进行滤波。
第一OVP电路401的一端以及第二OVP电路402的一端可以通过USB接口耦合至电源适配器41(可以简称电源)，第一OVP电路401的另一端耦合至第一PMIC 403，第二OVP电路402的另一端耦合至第二PMIC 404。第一OVP电路401用于对第一PMIC 403进行过压保护，第二OVP电路402用于对第二PMIC 404进行过压保护。
第一电池43通过第一PMIC 403耦合至耦合点N，第二电池44通过第二PMIC 404耦合至耦合点N，耦合点N耦合至负载45，耦合点N还用于分别通过第一PMIC 403和第二PMIC 404耦合至电源适配器41(即电源)。
第一PMIC 403用于控制第一电池43的充放电，测量第一电池43的电压，以及，向负载45供电。第二PMIC 404用于控制第二电池44的充放电，测量第二电池44的电压，以及，向负载45供电。
对于第一PMIC 403来说，第一PMIC 403包括开关管Q11、第一电压变换电路和开关管Q14，第一电压变换电路包括开关管Q12和开关管Q13。第一电压变换电路可以为降压(buck)电路、升压(boost)电路、降压升压(buck-boost)电路等，本申请实施例中第一电压变换电路的命名是以USB_IN1端口作为输入端口，以VSW1端口作为输出端口为例，此时第一电压变换电路是降压电路。那么当以VSW1端口作为输入端口，以USB_IN1端口作为输出端口时，该第一电压变换电路就是升压电路。
USB_IN1管脚用于输入充电电流。USB_IN1管脚通过开关管Q11耦合至PMID1管脚，PMID1管脚耦合至电容C1，从而对输入第一PMIC 403的充电电流进行滤波。PMID1管脚通过开关管Q12耦合至VSW1管脚，VSW1管脚通过开关管Q13接地，VPH_PW1管脚通过开关管Q14耦合至VCHG_OUT1管脚，VCHG_OUT1管脚耦合至第一电池43和比较器405。
第一PMIC 403通过控制开关管Q11的导通和关断来控制第一电压变换电路与USB_IN1管脚之间的电连接。第一PMIC 403通过控制开关管Q12和开关管Q13的占空比来调节输出的充电电压和充电电流。VSW1管脚耦合至电感L1、电容C3，用于对第一PMIC 403向负载45和第一电池43输出的充电电流进行滤波。
对于第二PMIC 404来说，第二PMIC 404包括开关管Q21、第二电压变换电路和开关管Q24，第二电压变换电路包括开关管Q22和开关管Q23。第二电压变换电路可以为降压(buck)电路、升压(boost)电路、降压升压(buck-boost)电路等，本申请实施例中第二电压变换电路的命名是以USB_IN2端口作为输入端口，以VSW2端口作为输出端口为例，此时第二电压变换电路是降压电路。那么当以VSW2端口作为输入端口，以USB_IN2端口作为输出端口时，该第二电压变换电路就是升压电路。
USB_IN2管脚用于输入充电电流。USB_IN2管脚通过开关管Q21耦合至PMID2管脚，PMID2管脚耦合至电容C2，从而对输入第二PMIC 404的充电电流进行滤波。PMID2管脚通过开关管Q22耦合至VSW2管脚，VSW2管脚通过开关管Q23接地，VPH_PW2管脚通过开关管Q24耦合至VCHG_OUT2管脚，VCHG_OUT2管脚耦合至第二电池44和比较器405。
第二PMIC 404通过控制开关管Q21的导通和关断来控制第二电压变换电路与USB_IN2管脚之间的电连接。第二PMIC 404通过控制开关管Q22和开关管Q23的占空比来调节输出的充电电压和充电电流。VSW2管脚耦合至电感L2、电容C4，用于 对第二PMIC 404向负载45和第二电池44输出的充电电流进行滤波。
第一PMIC 403的VPH_PW1管脚与第二PMIC 404的VPH_PW2管脚相耦合，从而可以实现第一电池43与第二电池44并联。
第一PMIC 403与第二PMIC 404之间可以通过内部集成电路(inter-integrated circuit，I2C)总线、串行外设接口(serial peripheral interface，SPI)总线、信号处理与多媒体图像(signal processing and multimedia image，SPMI)总线等进行通信。其中一个PMIC可以作为主PMIC，另一个PMIC可以作为从PMIC。主PMIC可以通知从PMIC开启某一管脚的某一功能，从PMIC可以向主PMIC通知从PMIC通过VCHG_OUT管脚测量的电池的电压。
比较器405用于对第一电池43和第二电池44的电压进行比较，并向第一PMIC 403或第二PMIC 404输出使能信号，该使能信号用于指示该PMIC打开向对应的电池的充电功能。
如图5所示，该双电池管理电路40的工作原理如下：
S101、比较器405对第一电池43和第二电池44的电压进行比较，并向电压高的电池所耦合的PMIC输出使能信号，以指示对应的PMIC打开对电压高的电池的充电功能。
示例性的，如图6所示，如果第一电池43的电压VBAT1高于第二电池44的电压VBAT2，则比较器405向第一PMIC 403输出使能信号，以指示第一PMIC 403打开充电功能，如果此时插入电源适配器41，则第一PMIC 403导通开关管Q11、开关管Q12、开关管Q14，从而可以向第一电池43输出充电电流以对第一电池43进行充电。
示例性的，如图7所示，如果第二电池44的电压VBAT2高于第一电池43的电压VBAT1，则比较器405向第二PMIC 404输出使能信号，以指示第二PMIC 404打开充电功能，如果此时插入电源适配器41，则第二PMIC 404导通开关管Q21、开关管Q22、开关管Q24，从而可以向第二电池44输出充电电流以对第二电池44进行充电。
对于电池过放导致电子设备关机的场景，电池电压过低(例如2.4V)无法保证整个电子设备的正常运行，仅能保证PMIC的工作。如果此时插入电源适配器41，可以对电压较高的电池进行充电以提高其供电电压，使得电池尽快恢复至能够保证电子设备正常运行的供电电压(例如3V)。因此，比较器405的作用是保证在电池过放导致电子设备关机的场景下，电压相对较高的电池可以快速被充电。
本申请以第一PMIC 403打开充电功能为例进行说明，此时第一PMIC 403作为主PMIC，第二PMIC 404作为从PMIC，但并不意在限定于此。
S102、第一PMIC 403在电子设备开机时检测是由于插入电源适配器41触发的开机或者由于长按开机键触发的开机。
如果是由于长按开机键触发的开机(即并未插入电源适配器41，未在对电池进行充电)，第一PMIC 403会在耦合至开机键的管脚(图中未示出)检测到开机信号，此时执行步骤S103-S104。如果是由于插入电源适配器41触发的开机(即在对电池进行充电)，第一PMIC 403会在USB_IN1管脚检测到较高的充电电压，执行步骤 S105-S106。
S103、如果第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth(即|VBAT1-VBAT2|<△Vth)，则第一PMIC 403和第二PMIC 404将第一电池43和第二电池44导通，使得第一电池43和第二电池44并联进行放电。
以第一PMIC 403作为主PMIC，第二PMIC 404作为从PMIC为例，第一PMIC 403可以通过测量VCHG_OUT1管脚的电压从而得到第一电池43的电压VBAT1，第二PMIC 404可以通过测量VCHG_OUT2管脚的电压从而得到第二电池44的电压VBAT2，再将第二电池44的电压VBAT2发送给第一PMIC 403，由第一PMIC 403比较第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差。
第一PMIC 403导通开关管Q14并处于饱和区，第一PMIC 403指示第二PMIC 404导通开关管Q24并处于饱和区，从而将第一电池43和第二电池44并联，开关管处于饱和区时的导通电流达到最大(即导通电流不再随栅极电压增大而增大)，此时对电池的放电电流不作限制，即关闭限流功能，使得电池能够正常为负载供电。如图8所示，第一PMIC 403可以关断开关管Q11、开关管Q12，第二PMIC 404可以关断开关管Q21、开关管Q22，并联的第一电池43和第二电池44可以共同向负载45供电。
电子设备在正常使用过程中(非充电模式下)，开关管Q14和开关管Q24始终导通，第一电池43和第二电池44之间的电压差很小，并且可以同步进行放电，互相之间不会产生较大电流，不会损坏电池或PMIC。
S104、如果第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差大于或等于阈值△Vth，则第一PMIC 403和第二PMIC 404将第一电池43与第二电池44导通，第一PMIC 403或第二PMIC 404限制第一电池43与第二电池44之间的导通电流，使得电压高的电池对电压低的电池进行限流充电，直至第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth。
此时，第一PMIC 403导通开关管Q14，第二PMIC 404导通开关管Q24，并且控制开关管Q14或开关管Q24中的一个处于线性阻抗区，通过调节处于线性阻抗区的开关管的等效阻值，即可以调节开关管的导通电流，使得开关管的导通电流受限可控，从而防止第一电池43与第二电池44之间产生较大电流。
示例性的，如图9所示，假设VBAT1>VBAT2+△Vth，第一PMIC 403导通开关管Q14并处于饱和区，并指示第二PMIC 404导通开关管Q24并处于线性阻抗区，此时，第一电池43不仅向负载45供电，还以限流方式对第二电池44进行充电。在此过程中，第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差会逐渐减小，直至第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth，会继续执行步骤S103。
示例性的，如图10所示，假设VBAT2>VBAT1+△Vth，第一PMIC 403导通开关管Q14并处于线性阻抗区，并指示第二PMIC 404导通开关管Q24并处于饱和区，此时，第二电池44不仅向负载45供电，还以限流方式对第一电池43进行充电。在此过程中，第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差会逐渐减小，直至第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth，会继续执行步骤S103。
S105、如果第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth(即|VBAT1-VBAT2|<△Vth)，则第一PMIC 403和第二PMIC 404将第一电池43和第二电池44导通，使得第一电池43和第二电池44并联进行充电。
第一PMIC 403导通开关管Q14并处于饱和区，第一PMIC 403指示第二PMIC 404导通开关管Q24并处于饱和区，从而将第一电池43和第二电池44并联，开关管处于饱和区时的导通电流达到最大(即导通电流不再随栅极电压增大而增大)，此时对电池的充电电流不作限制，即关闭限流功能，使得电池能够尽快充电。如图11所示，第一PMIC 403和第二PMIC 404不仅向负载45供电，还同时对第一电池43和第二电池44进行充电。
在电子设备充电过程中，开关管Q14和开关管Q24始终导通，第一电池43和第二电池44之间的电压差很小，并且可以同步进行充电，互相之间不会产生较大电流，不会损坏电池或PMIC。另外，当某一个电池先充满时，对应的PMIC可以关闭对该电池进行充电的功能(即关断开关管Q14或Q24)，两个PMIC可以继续对另一个未充满的电池进行充电，直至两个电池都充满，解决了多个电池单个PMIC方案中某个电池无法完全充满的问题。
S106、如果第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差大于或等于阈值△Vth，则电压高的电池对应的PMIC停止向电压高的电池进行充电，电压低的电池对应的PMIC打开限流(regulation)功能，第一PMIC 403和第二PMIC 404以限流方式共同对电压低的电池进行充电。
示例性的，如图12所示，假设VBAT1>VBAT2+△Vth，第一PMIC 403关断开关管Q14，并指示第二PMIC 404导通开关管Q24并处于线性阻抗区，此时，第一PMIC 403和第二PMIC 404以限流方式共同对第二电池44进行充电。在此过程中，第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差会逐渐减小，直至第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth，会继续执行步骤S105。
示例性的，如图13所示，假设VBAT2>VBAT1+△Vth，第一PMIC 403导通开关管Q14并处于线性阻抗区，并指示第二PMIC 403关断开关管Q24，此时，第一PMIC 403和第二PMIC 404以限流方式共同对第一电池43进行充电。在此过程中，第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差会逐渐减小，直至第一电池43的电压VBAT1与第二电池44的电压VBAT2之间的电压差小于阈值△Vth，会继续执行步骤S105。
本申请实施例提供的双电池管理电路和电子设备，通过比较两个电池之间的电压差，当电压差大于阈值时，将两个电池导通，并且，这两个PMIC对两个电池之间的导通电流进行限流，从而防止两个电池之间产生大电流，并实现两个电池的电压均衡。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的模块及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功 能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和模块的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、设备和方法，可以通过其它的方式实现。例如，以上所描述的设备实施例仅仅是示意性的，例如，所述模块的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个模块或组件可以结合或者可以集成到另一个设备，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，设备或模块的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的模块可以是或者也可以不是物理上分开的，作为模块显示的部件可以是或者也可以不是物理模块，即可以位于一个设备，或者也可以分布到多个设备上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能模块可以集成在一个设备中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个设备中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(Digital Subscriber Line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (7)

  1. 一种双电池管理电路，其特征在于，包括：第一PMIC和第二PMIC；所述第一PMIC用于控制第一电池的充放电以及测量所述第一电池的电压，所述第二PMIC用于控制第二电池的充放电以及测量所述第二电池的电压；所述第一电池通过所述第一PMIC耦合至耦合点，所述第二电池通过所述第二PMIC耦合至所述耦合点，所述耦合点耦合至负载，所述耦合点还用于分别通过所述第一PMIC和所述第二PMIC耦合至电源；当所述第一电池与所述第二电池之间的电压差大于或等于阈值时，所述第一PMIC和所述第二PMIC用于：
    如果未接入电源，则将所述第一电池与所述第二电池导通，并限制所述第一电池与所述第二电池之间的导通电流，使得电压高的电池对电压低的电池进行限流充电。
  2. 根据权利要求1所述的电路，其特征在于，当所述第一电池与所述第二电池之间的电压差大于或等于阈值时，所述第一PMIC和所述第二PMIC还用于：
    如果接入电源，则停止对电压高的电池进行充电，打开限流功能，对电压低的电池进行限流充电。
  3. 根据权利要求1或2所述的电路，其特征在于，当所述第一电池与所述第二电池之间的电压差小于阈值时，所述第一PMIC和所述第二PMIC还用于：
    将所述第一电池与所述第二电池导通，并且关闭限流功能。
  4. 根据权利要求1或2所述的电路，其特征在于，还包括比较器，
    所述比较器，用于比较所述第一电池的电压以及所述第二电池的电压，并向电压高的电池所对应的PMIC输出使能信号，所述使能信号用于指示对应的PMIC打开对所述电压高的电池的充电功能。
  5. 根据权利要求1或2所述的电路，其特征在于，所述第一PMIC中包括第一开关管，所述第二PMIC中包括第二开关管，所述第一电池通过所述第一开关管耦合至所述耦合点，所述第二电池通过所述第二开关管耦合至所述耦合点。
  6. 根据权利要求5所述的电路，其特征在于，所述将所述第一电池与所述第二电池导通，并打开限流功能，包括：
    控制所述第一开关管导通，并控制所述第二开关管导通，并且控制所述第一开关管或所述第二开关管中的一个处于线性阻抗区。
  7. 一种电子设备，其特征在于，包括如权利要求1-6任一项所述的双电池管理电路、第一电池和第二电池，所述双电池管理电路用于对所述第一电池和所述第二电池的充放电进行管理。
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