CN116566008A - Battery circuit and power supply method - Google Patents

Battery circuit and power supply method Download PDF

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Publication number
CN116566008A
CN116566008A CN202310555662.4A CN202310555662A CN116566008A CN 116566008 A CN116566008 A CN 116566008A CN 202310555662 A CN202310555662 A CN 202310555662A CN 116566008 A CN116566008 A CN 116566008A
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CN
China
Prior art keywords
battery
load
voltage
transistor
module
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Pending
Application number
CN202310555662.4A
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Chinese (zh)
Inventor
陈光辉
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Application filed by Vivo Mobile Communication Co Ltd filed Critical Vivo Mobile Communication Co Ltd
Priority to CN202310555662.4A priority Critical patent/CN116566008A/en
Publication of CN116566008A publication Critical patent/CN116566008A/en
Pending legal-status Critical 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
    • H02J7/00032—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
    • 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
    • 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
    • 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
    • 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
    • H02J7/00306—Overdischarge protection
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • 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
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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

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

Abstract

The application discloses a battery circuit and a power supply method, and belongs to the technical field of communication. The battery circuit comprises a first battery, a second battery, a buck-boost module, an acquisition module and a control module, wherein the positive electrode end of the first battery is respectively connected with the negative electrode end of the second battery and a first load, the negative electrode end of the first battery is grounded, and the positive electrode end of the second battery is connected with a second load; the acquisition module is used for acquiring the voltage and the current of the first battery and the voltage and the current of the second battery; the control module is respectively connected with the acquisition module and the lifting and pressing module, and sends control signals to the lifting and pressing module based on the voltage and the current of the first battery and the voltage and the current of the second battery acquired by the acquisition module; the voltage boosting and reducing module is respectively connected with the positive electrode end of the first battery and the positive electrode end of the second battery, and adjusts power supply to the first load and the second load based on control signals so as to synchronize the charge state of the first battery with the charge state of the second battery.

Description

Battery circuit and power supply method
Technical Field
The application belongs to the technical field of communication, and particularly relates to a battery circuit and a power supply method.
Background
Electronic devices typically include processors, memories, charging modules, power management modules, batteries, antennas, radio frequency modules, audio modules, speakers, receivers, microphones, sensors, motors, cameras, displays, and the like. The source of the electric power is a battery or a charger, and the working voltage of the lithium ion battery is generally in the range of 3.0V-4.5V.
However, due to different designs and manufacturing processes of different modules of the electronic device, the power supply characteristics have large differences, for example, the working voltages of a processor, a memory, a sensor, a camera and the like are generally below 1.8V, and the battery needs to supply power to the modules through voltage reduction. The display screen, the high-voltage linear motor and part of the audio modules need working voltage of 5V and above, and the battery needs to supply power for the modules through voltage reduction.
When two or more batteries are used to power an electronic device, a serial or parallel connection is typically used. The multi-battery serial power supply needs the same capacity of each battery, so that overcharge or overdischarge of part of batteries is avoided, the stacking requirement is high, the batteries need to be subjected to a step-down and step-up process on a power supply link from the batteries to a load, the efficiency loss is large, and the continuous voyage is not facilitated. The multi-battery parallel power supply has larger input and output voltage difference for a load with high working voltage, and the conversion efficiency of the power supply is low.
Disclosure of Invention
The embodiment of the application aims to provide a battery circuit and a power supply method, which can solve the problem of low power supply efficiency.
In a first aspect, an embodiment of the present application provides a battery circuit, including a first battery, a second battery, a buck-boost module, an acquisition module and a control module, where an anode end of the first battery is connected to a cathode end of the second battery and a first load respectively, a cathode end of the first battery is grounded, and an anode end of the second battery is connected to the second load; the acquisition module is used for acquiring the voltage and the current of the first battery and the voltage and the current of the second battery; the control module is respectively connected with the acquisition module and the lifting pressure module, and the control module sends control signals to the lifting pressure module based on the voltage and the current of the first battery and the voltage and the current of the second battery acquired by the acquisition module; the voltage boosting and reducing module is respectively connected with the positive electrode end of the first battery and the positive electrode end of the second battery, and adjusts power supply to the first load and the second load based on the control signals so as to synchronize the charge state of the first battery with the charge state of the second battery.
In a second aspect, an embodiment of the present application provides a power supply method applied to the battery circuit in the first aspect, including:
collecting the voltage of the first battery, the voltage of the second battery, the current flowing through the first battery and the current flowing through the second battery;
and in the case that the state of charge of the first battery is not synchronous with the state of charge of the second battery according to the acquired voltage and current, adjusting power supply to the first load and the second load so as to synchronize the state of charge of the first battery with the state of charge of the second battery.
In a third aspect, embodiments of the present application provide an electronic device including a battery circuit as described in the first aspect above.
In this embodiment of the present application, through being connected the positive terminal of first battery with the negative terminal of second battery, first load respectively, the positive terminal of second battery is connected with second load 2, and the buck-boost module is connected with the positive terminal of first battery, the positive terminal of second battery respectively, buck-boost module can be based on the voltage and the electric current of first battery and voltage and the electric current adjustment of second battery to the power supply of first load, second load, from this through first battery and the second battery of establishing ties, can be at the sum of promotion to the input voltage of high operating voltage load to the voltage of two batteries, reduce high operating voltage load input and output voltage differential, greatly improve the conversion efficiency of power, and provide the voltage of a battery output to low operating voltage load is direct, avoid the buck-boost conversion of voltage, reduce power supply efficiency loss, promote duration. In addition, based on the voltage and the current of the first battery and the second battery, the voltage-boosting module adjusts the power supply to the first load and the second load, so that the states of charge of the first battery and the second battery are synchronous, the overcharge or overdischarge of the batteries is avoided, and the service life of the batteries is prolonged.
Drawings
Fig. 1 is a block diagram of the structure of a battery circuit according to an embodiment of the present application.
Fig. 2 is a circuit schematic of a battery circuit according to one embodiment of the present application.
Fig. 3 is a circuit schematic diagram of a battery circuit according to a discharge state in an embodiment of the present application.
Fig. 4 is a circuit schematic diagram of a battery circuit according to a state of charge in an embodiment of the present application.
Fig. 5 is a schematic diagram of the working principle of the buck-boost module according to one embodiment of the present application.
Fig. 6 is a schematic diagram illustrating an operating principle of the buck-boost module according to an embodiment of the present application.
Fig. 7 is a circuit schematic of a battery circuit according to another embodiment of the present application.
Fig. 8 is a schematic diagram illustrating an operation principle of a buck-boost module according to another embodiment of the present application.
Fig. 9 is a schematic flow chart of a power supply method according to an embodiment of the present application.
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The battery circuit and the power supply method provided by the embodiment of the application are described in detail below by means of specific embodiments and application scenes thereof with reference to the accompanying drawings.
Fig. 1 is a block diagram of a battery circuit according to an embodiment of the present application, and as shown in fig. 1, the battery circuit includes a first battery 10, a second battery 20, a step-up and step-down module 30, an acquisition module 40, and a control module 50, where an anode terminal of the first battery 10 is connected to a cathode terminal of the second battery 20 and a first load 1, respectively, and a cathode terminal of the first battery 10 is grounded, and a cathode terminal of the second battery 20 is connected to a second load 2; the acquisition module 40 is configured to acquire a voltage and a current of the first battery 10 and a voltage and a current of the second battery 20; the control module 50 is respectively connected with the acquisition module 40 and the voltage-raising and voltage-lowering module 30, and the control module 50 sends control signals to the voltage-raising and voltage-lowering module 30 based on the voltage and current of the first battery 10 and the voltage and current of the second battery 20 acquired by the acquisition module 40; the voltage raising and lowering module 30 is respectively connected to the positive electrode terminal of the first battery 10 and the positive electrode terminal of the second battery 20, and the voltage raising and lowering module 30 adjusts the power supply to the first load 1 and the second load 2 based on the control signal so as to synchronize the state of charge of the first battery with the state of charge of the second battery.
The positive terminal of the first battery 10 is connected with the negative terminal of the second battery 20, the negative terminal of the first battery 10 is grounded through the grounding terminal GND, and the positive terminal of the first battery 10 is also connected with the first load 1, so that voltage can be directly output to supply power to the first load 1. The positive terminal of the second battery 20 is connected to the second load 2, and the voltages output from the first battery 10 and the second battery 20 can be superimposed to supply power to the second load 2.
The first battery 10 and the second battery 20 may be lithium batteries, and the operating voltage of the lithium batteries ranges from 3.0V to 4.5V, so that the voltage provided by the first battery 10 to the first load 1 may be up to 4.5V, and the voltage provided by the first battery 10 and the second battery connected in series to the second load 2 may be up to 9V. The first load 1 is a high operating voltage load and the second load 2 is a low operating voltage load.
Since the first load 1 and the second load 2 are decided based on the scene of use of the user, the size is not controllable. Therefore, there may be a case where the first load 1 and the second load 2 consume different amounts of electricity, which causes a difference in state of charge (SOC) of the first battery 10 and the second battery 20, and further causes an overcharge or overdischarge phenomenon of a certain battery, resulting in damage to the battery.
The collecting module 40 can collect data such as voltage and current of the first battery 10 and voltage and current of the second battery 20, and the control module 50 is connected with the collecting module 40, so as to obtain the collected data of the collecting module 40, and determine whether the current states of charge of the first battery 10 and the second battery 20 are different according to the collected data. And when the states of charge are different, a control signal is sent to the step-up/down module 30 to control the step-up/down module 30 to adjust the voltages provided by the first battery 10 and the second battery 20 to the first load 1 and the second load 2.
In this embodiment, the voltage raising and lowering module 30 is connected to the positive electrode terminal of the first battery 10 and the positive electrode terminal of the second battery 20, respectively, that is, the voltage raising and lowering module 30 may be connected to the first load 1 and the second load 2 to form corresponding current paths.
Referring to fig. 1, a first end of the voltage raising and lowering module 30 is connected to the positive end of the first battery 10 and the first load 1 at a first node a, respectively; a second end of the voltage raising and lowering module 30 is connected to the positive end of the second battery 20 and the second load 2 at a second node B, respectively; a third end of the buck-boost module 30 is connected to the control module 50.
The first battery 10 may form a path to the second load 2 with the voltage step-up/down module 30 in addition to a path to the first load 1. Therefore, the voltage output by the positive terminal of the first battery 10 may directly supply power to the first load 1, may supply power to the first load 1 with the buck-boost module 30, and may supply power to the second load 2 with the buck-boost module 30.
Likewise, the second battery 20 may form a path to the first load 1 with the voltage raising and lowering module 30 in addition to a path to the second load 2. Therefore, the second load 2 may be directly powered by the voltage output from the positive terminal of the second battery 20, or may be matched with the buck-boost module 30 to supply power to the second load 2.
As shown in fig. 1, the third end of the buck-boost module 30 and the control module 50 are configured to receive a control signal sent by the control module 50. The working principle of how the control module 50 sends the control signals so that the buck-boost module 30 correspondingly adjusts the power supply to the first load 1 and the second load 2 according to the control signals will be described below.
As described above, the acquisition module 40 is used to acquire the voltages and currents of the first battery 10 and the second battery 20. Referring to fig. 2, in one embodiment, the collecting module 40 includes a first sampling resistor Rsense1 and a first current collecting unit Isns1, a second sampling resistor Rsense2 and a current collecting unit Isns2, and a first voltage collecting unit Vsns1 and a second voltage collecting unit Vsns2, the first sampling resistor Rsense1 is connected between the negative terminal of the first battery 10 and the ground, and the first current collecting unit Isns1 collects the current flowing through the first battery 10 by collecting the voltage across the first sampling resistor Rsense1 and the resistance value of the first sampling resistor Rsense 1; the second sampling resistor Rsense2 is connected between the negative terminal of the second battery 20 and the positive terminal of the first battery 10, and the second current collecting unit Isns2 collects the current flowing through the second battery 20 by collecting the voltage at two ends of the second sampling resistor Rsense2 and the resistance value of the second sampling resistor Rsense 2; the first voltage acquisition unit Vsns is connected to the positive terminal of the first battery 10, and is configured to acquire the voltage of the first battery 10; the second voltage acquisition unit Vsns2 is connected to the positive terminal of the second battery 20, and is configured to acquire the voltage of the second battery 20; the control module 50 is connected to the collection module 40, and is configured to send the control signal to the third terminal of the buck-boost module 30 according to the current and the voltage collected by the collection module 40.
The collection module 40 includes a module for collecting a current signal and a module for collecting a voltage signal, and in the embodiment of fig. 2, the first sampling resistor Rsense1 and the first current collection unit iss 1 constitute a module for collecting a current flowing through the first battery 10, and the first sampling resistor Rsense1 is connected between the negative terminal of the first battery 10 and the ground. In other embodiments, the current collection may be performed by replacing the sampling resistor with a MOS transistor, which is not limited to the specific embodiment described above.
The first current collection unit iss 1 is connected to two ends of the first sampling resistor Rsense1 to collect voltage signals of each end, and then the voltage difference between the two ends of the first sampling resistor Rsense1 is divided by the resistance value of the first sampling resistor Rsense1 to obtain current flowing through the first sampling resistor Rsense1, wherein the current flowing through the first sampling resistor Rsense1 is the current flowing through the first battery 10.
Likewise, the second sampling resistor Rsense2 and the second current collecting unit Isns2 constitute a module for collecting the current flowing through the second battery 20, and the second sampling resistor Rsense2 is connected between the positive terminal of the first battery 10 and the negative terminal of the second battery 20.
The second current collection unit Isns2 is connected to two ends of the second sampling resistor Rsense2 to collect the voltage signals of each end, and then the voltage difference between the two ends of the second sampling resistor Rsense2 is divided by the resistance value of the second sampling resistor Rsense2, so that the current flowing through the second sampling resistor Rsense2 can be obtained, and the current flowing through the second sampling resistor Rsense2 is the current flowing through the second battery 20.
In the embodiment of fig. 2, the first voltage acquisition unit Vsns1 is connected to the positive terminal of the first battery 10, and is configured to acquire the voltage VBAT1 of the first battery 10, and the voltage at the first node a is VBAT1 when the first load 1 is powered by discharging. The second voltage acquisition unit Vsns2 is connected to the positive terminal of the second battery 20, and is configured to acquire the voltage VBAT2 of the second battery 20, and when discharging and powering the second load 2, the voltage at the second node B is vbat1+vbat2.
The power supply of the first load 1 is realized by the voltage VBAT1 output by the first battery 10, or the voltage VBAT1 output by the first battery 10 is matched with the buck-boost module 30, and the power supply of the second load 2 is realized by the voltage VBAT1+vbat2 output by the second battery 20, or the voltage VBAT1+vbat2 output by the second battery 20 is matched with the buck-boost module 30.
As described above, when the battery discharges to power the load, the voltage at the first node a may be VBAT1, the voltage at the second node B is vbat1+vbat2, and the voltage of the first node B is greater than the voltage of the second node a, so the first load 1 connected to the first node a is selected as a low operating voltage load, and the second load 2 connected to the second node B is selected as a high operating voltage load.
In this way, the voltage output by the first battery 10 and the second battery 20 corresponding to the circuit connection relationship can fall in the working voltage range corresponding to the load, the condition that the voltage difference between the input voltage and the output voltage of the second load 2 with high working voltage is larger does not exist, and the conversion efficiency of the power supply is improved. And other boosting modules or step-down modules are not needed, so that the efficiency loss is avoided to be large, and the cruising and lifting are facilitated.
As described above, since the first load 1 and the second load 2 are determined based on the user's usage scenario, when the power consumption of the first load 1 and the second load 2 is different, the state of charge of the first battery 10 and the state of charge of the second battery 20 may be different or not synchronized, and it is necessary to control the state of charge of the first battery 10 and the state of charge of the second battery 20 in real time during the power supply to the first load 1 and the second load 2, so as to adjust the power supply to the first load 1 and the second load 2.
The current and the voltage of the first battery 10 and the second battery 20 are different from each other in the discharge state and the charge state, and the power supply mode of the buck-boost module 30 to the first load 1 and the second load 2 is also different.
Optionally, the first load 1 is a low operating voltage load, the second load 2 is a high operating voltage load, and the control module 50 controls the buck-boost module 30 to adjust the first current flowing through the second end of the buck-boost module 30 to synchronize the state of charge of the first battery 10 with the state of charge of the second battery 20 according to the first discharging current flowing through the first battery 10, the second discharging current flowing through the second battery 20, the available maximum capacity of the first battery 10, and the available maximum capacity of the second battery 20 when the current collected by the collection module 40 is a discharging current.
In the discharging state, as shown in fig. 3, after the supply voltage of the second load 2 is connected in series through the first battery 10 and the second battery 20, the supply voltage is raised to vbat1+vbat2, so that the supply efficiency can be greatly improved.
The discharge current of the first battery 10 is I1, and the discharge current of the second battery 20 is I2. The second end of the buck-boost module 30 is a port connected to the second node B, and the current flowing through the second end of the buck-boost module 30 is I4. The first end of the buck-boost module 30 is a port connected to the first node a, and the current flowing through the first end of the buck-boost module 30 is I3.
When the buck-boost module 30 operates in the buck mode, the corresponding input current is the current I4, the corresponding output current is the current I3, the corresponding input voltage is vbat1+vbat2, the output voltage is VBAT1, and the conversion efficiency is η0:
current input to the first load 1:
current input to the second load 2:
I2＝I4+Iload2
while the load is supplied by the series discharge of the first battery 10 and the second battery 20, it is also necessary to control the state of charge of the first battery 10 to be synchronized with the state of charge of the second battery 20. At this time, the control module 50 may regulate the voltage raising and lowering module 30 through the current and voltage information of the first battery 10 and the second battery 20 collected by the collection module 40, and the specific scheme is as follows:
The state of charge (SOC) of the first battery 10 or the second battery 20 can be generally expressed as a function: soc=f (Q, OCV, T), where Q represents the coulomb integral of current I with time T; OCV is open circuit voltage, used for calibration and electric quantity correction; t represents the battery temperature.
In the case where the open circuit voltage OCV does not reach the same calibration condition and the temperature T, the state of charge SOC1 of the first battery 10, the state of charge SOC2 of the second battery 20 are estimated based on the current integration:
wherein Qmax1 and Qmax2 represent the maximum capacities available of the first battery 10 and the second battery 20, respectively.
In order to keep the states of charge of the first battery 10 and the second battery 20 synchronized, f (Q1) =f (Q2), VBAT1≡vbat2 when the states of charge are synchronized, since the current Iload1 input to the first load1 and the current Iload2 input to the second load2 are determined by the user scenario and are not controllable, it can be deduced that according to f (Q1) =f (Q2):
in the above formula, the current Iload1 and the current Iload2 are related to the user scene, and may be represented by I1 and I2, where η0 is a fixed value, qmax1 and Qmax2 are known values obtained by the acquisition module 40, I4 is a variable that can be regulated by the control module 50, and SOC 1=soc2 can be achieved by adjusting the current I4.
The control module 50 may determine whether the current states of charge of the first battery 10 and the second battery 20 are synchronous by determining whether the voltage VBAT1 of the first battery 10 and the voltage VBAT1 of the second battery 20 acquired by the acquisition module are equal. When the absolute value of VBAT1-VBAT2 is less than delta V0, namely the pressure difference of VBAT1 and VBAT2 is within a certain threshold delta V0, VBAT1 is approximately equal to VBAT2, judging synchronization; otherwise, the synchronization is not performed.
Upon determining that the state of charge of the first battery 10 is not synchronized with the state of charge of the second battery 20, a current Iload1 supplied to the first load1 and a current Iload2 supplied to the second load2 are determined based on the collected voltage of the first battery 10, the voltage of the second battery 20, and the first discharge current flowing through the first battery 10, the second discharge current flowing through the second battery 20.
The magnitude of the current I4 flowing through the second end of the buck-boost module 30 is adjusted according to the current Iload1 and the current Iload2, the available maximum capacity of the first battery 10, the available maximum capacity of the second battery 20, and other parameters, in combination with the above formula (2), so as to adjust the power supply to the first load1 and the second load2 until the detection of |vbat1-vbat2| < Δv0, that is, the adjustment is stopped when the state of charge of the first battery 10 is synchronous with the state of charge of the second battery 20.
When the control module 50 detects that the state of charge of the second battery 20 drops faster than the first battery 10, i.e. the second load 2 is larger, the buck-boost module 30 operates in the buck mode, as shown in fig. 3, the buck-boost module 30 operates in the buck mode, and the current direction of the current I4 is forward, and the current I4 is reduced by controlling the buck-boost module 30 to compensate; if the second load 2 is large, the buck-boost module 30 may operate in a boost mode, where the current I4 is reversed, the first battery 10 is boosted in reverse through the buck-boost module 30 to power the second load 2, reducing the power consumption of the second battery 20, and increasing the power consumption of the first battery 10 to compensate, so that the state of charge of the first battery 10 is synchronized with the second battery 20.
When the state of charge of the second battery 20 drops slower than the first battery 10, i.e. the second load 2 is smaller, compensation is performed by controlling the buck-boost module 30 to increase the current I4. The charge consumption of the second battery 20 is increased while the charge consumption of the first battery 10 is decreased to compensate so that the state of charge of the second battery 20 is synchronized with the first battery 10.
In another embodiment, the first load 1 is a low operating voltage load, the second load 2 is a high operating voltage load, and the control module 50 controls the buck-boost module 30 to adjust the second current flowing through the second end of the buck-boost module 30 to synchronize the state of charge SOC of the first battery 10 with the state of charge SOC of the second battery 20 according to the first charging current flowing through the first battery 10, the second charging current flowing through the second battery 20, the available maximum capacity of the first battery 10, and the available maximum capacity of the second battery 20 when the current collected by the collection module 40 is the charging current.
In the state of charge, the control module 50 may determine whether the current states of charge of the first battery 10 and the second battery 20 are synchronous by determining whether the voltage VBAT1 of the first battery 10 and the voltage VBAT1 of the second battery 20 acquired by the acquisition module 40 are equal. Judging synchronization when the pressure difference between VBAT1 and VBAT2 is within a certain threshold value delta V0; otherwise, the synchronization is not performed.
Upon determining that the state of charge of the first battery 10 is not synchronized with the state of charge of the second battery 20, a current Iload1 supplied to the first load1 and a current Iload2 supplied to the second load2 are determined based on the collected voltage of the first battery 10, the voltage of the second battery 20, and the first discharge current flowing through the first battery 10, the second discharge current flowing through the second battery 20.
The buck-boost conversion module 30 operates in a boost mode, the first terminal of the buck-boost module 30 inputs current as the second terminal of the buck-boost module 30 outputs current, while charging the second battery 20 and powering the second load2.
The magnitude of the current I4 flowing through the second end of the buck-boost module 30 is adjusted according to the current Iload1 and the current Iload2, the available maximum capacity of the first battery 10, the available maximum capacity of the second battery 20, and other parameters, in combination with the above formula (2), so as to adjust the power supply to the first load1 and the second load2 until the detection of |vbat1-vbat2| < Δv0, that is, the adjustment is stopped when the state of charge of the first battery 10 is synchronous with the state of charge of the second battery 20.
When the control module 50 detects that the state of charge of the second battery 20 rises faster than the first battery 10, i.e. the charging current for charging the second battery 20 is larger, the output current flowing through the second end of the buck-boost module 30 is reduced by controlling the buck-boost module 30 to compensate. The buck-boost module 30 may even stop operating, with a current output at the second end of 0, ensuring that the second battery 20 is synchronized with the state of charge rise of the first battery 10.
When the state of charge of the second battery 20 drops slower than the first battery 10, i.e. the second load 2 is smaller, compensation is performed by controlling the buck-boost module 30 to increase the output current of the second terminal. Thereby, the charging of the second battery 20 is increased, while the charging of the first battery 10 is decreased to compensate, so that the state of charge of the second battery 20 is synchronized with the first battery 10.
In one embodiment, the battery circuit further includes a charging module, a first end of the charging module is connected to an external power source, a second end of the charging module is connected to the first load 1, a third end of the charging module is connected to the positive end of the first battery 10 and the first end of the voltage raising and lowering module 30 at the first node a, and a fourth end of the charging module is connected to the control module 50; the control module 50 is further configured to control the charging module 60 to charge the first battery 10 and charge the second battery 20 through the buck-boost module 30 according to the current and the voltage collected by the collection module 40.
As shown in fig. 2, one end of the charging module 60 is connected to the charger 70, a second end of the charging module 60 is connected to the first load 1, and a third end of the charging module 60 is connected to the positive end of the first battery 10 and the first end of the buck-boost module 30.
The charging module has a path management function, and the first battery supplies power to the first load through path management of the charging module in a discharging state; and in a charging state, the charging module converts energy of the external power supply and supplies power to the first battery, the second battery and the first load respectively.
The charging module 60 is responsible for charging the first battery 10, and is matched with the voltage boosting and reducing module 30 to charge the second battery 20. Meanwhile, the charging module 60 has a path management function. During discharging, the first battery 10 supplies power to the first load 1 through path management of the charging module 60; in charging, the energy of the charger 70 is converted by the charging module 60, and the first load 1 is supplied with power while the first battery 10 and the second battery 20 are charged.
In a discharging state, as shown in fig. 4, when the user connects the charger 70 to charge, after the user is converted by the charging module 60, the charging current is split into two directions at the first node a to charge the first battery 10 and the second battery 20 respectively, wherein the current Ichg0 directly charges the first battery 10, and the current Ichg3 is converted by the buck-boost module 30 to charge the second battery 20 and the first battery 10 simultaneously, and at this time, the buck-boost module 30 operates in the boost mode.
Since the total current output by the charging module 60 is Ichg and the charging module 60 has a path management function, the first load1 can directly supply the current Iload1 by the charging module 60, the charging current of the first battery 10 is ichg1=ichg0+ichg2, the charging current of the second battery 20 is Ichg2, when the buck-boost module 30 is operated in the boost mode, the current output by the buck-boost module 30 corresponding to the second end at the second node B is Ichg4, and as shown in fig. 4, the buck-boost module 30 is operated in the boost mode, the current Ichg4 is reversed, and simultaneously the current Ichg2 is used to charge the second battery 20 and supply the current Iload2 to the second load2. The current input by the first end of the buck-boost module 30 corresponding to the first node a is Ichg3, the output voltage corresponding to the second end of the buck-boost module 30 is vbat1+vbat2, the input voltage corresponding to the first end of the buck-boost module 30 is VBAT1, and the conversion efficiency is η1:
Ichg2＝Ichg4-Iload2
in the case where the open circuit voltage OCV does not reach the same calibration condition and the temperature T, the states of charge of the first battery 10 and the second battery 20 are estimated based on the current integration:
in order to keep the states of charge of the first battery 10 and the second battery 20 synchronous, f (Q1) =f (Q2), VBAT1≡vbat2 when the states of charge are the same, since the current Iload1 input to the first load1 and the current Iload2 input to the second load2 are determined by the user scenario and are not controllable, it can be deduced from f (Q1) =f (Q2):
In the above formula, the current Iload2 is related to the user scene, η1 is a fixed value, qmax1, qmax2 and the current Ichg1 are known values obtained by the acquisition module 40, ichg4 is a variable that can be regulated by the control module 50, and thus soc1=soc2 can be achieved by adjusting the current Ichg 4.
The control module 50 may determine whether the current states of charge of the first battery 10 and the second battery 20 are synchronous by determining whether the voltage VBAT1 of the first battery 10 and the voltage VBAT1 of the second battery 20 acquired by the acquisition module are equal. Judging synchronization when the pressure difference between VBAT1 and VBAT2 is within a certain threshold value delta V0; otherwise, the synchronization is not performed.
Upon determining that the state of charge of the first battery 10 is not synchronized with the state of charge of the second battery 20, the current Iload2 supplied to the second load2 is determined based on the collected voltage VBAT1 of the first battery 10, the voltage VBAT2 of the second battery 20, and the first charging current Ichg1 flowing through the first battery 10, the second charging current Ichg2 flowing through the second battery 20.
According to the first charging current Ichg1, the current Iload2, the available maximum capacity Qmax1 of the first battery 10 and the available maximum capacity Qmax2 of the second battery 20, the magnitude of the current Ichg4 flowing through the second terminal of the buck-boost module 30 is adjusted in conjunction with the above formula (3), thereby adjusting the power supply to the first load 1 and the second load2 until |vbat1-vbat2| < Δv0is detected, i.e., the adjustment is stopped when the state of charge of the first battery 10 is synchronized with the state of charge of the second battery 20.
When the control module 50 detects that the state of charge of the second battery 20 rises faster than the first battery 10, that is, the charging current lchg2 of the second battery 20 is larger, the current Ichg4 is reduced by controlling the buck-boost module 30 to compensate, so as to ensure that the state of charge of the second battery 20 is synchronous with the state of charge of the first battery 10.
When the control module 50 detects that the state of charge of the second battery 20 rises slower than the first battery 10, i.e. the second load 2 is smaller, the current Ichg4 is increased by controlling the buck-boost module 30 to compensate, so as to ensure that the state of charge of the second battery 20 is synchronous with the state of charge of the first battery 10.
In one embodiment, as shown in fig. 2 to 4, the buck-boost module includes a first transistor Q1, a second transistor Q2, a driving unit 32 and an inductor L, where a gate of the first transistor Q1 is connected to the driving unit 32, a source of the first transistor Q1 is connected to a positive terminal of the second battery and the second load at the second node B, and a drain of the first transistor Q1 is connected to the second transistor Q2; the grid electrode of the second transistor Q2 is connected with the driving unit, the source electrode of the second transistor Q2 is connected with the drain electrode of the first transistor Q1, and the drain electrode of the second transistor Q2 is grounded; the first end of the inductor L is connected between the drain of the first transistor Q1 and the source of the second transistor Q2, and the second end of the inductor L is connected to the positive end of the first battery and the first load at the first node, respectively.
For the discharging state of the above embodiment, when the control module 50 detects that the state of charge of the second battery 20 drops faster than the first battery 10, the control module 50 compensates by controlling the current I4 to be reduced by the voltage step-up/down module 30 of the embodiment of fig. 2 to 4, and the specific principle is as follows:
defining the first transistor Q1 and the second transistor Q2 to be turned on to be high and turned off to be low, and defining the current IL flowing through the inductor L to be positive when the voltage is reduced, the control waveforms of the first transistor Q1, the second transistor Q2 and the inductor current IL are as shown in fig. 5, and when the voltage is reduced, if the second load 2 becomes larger gradually, the control module 50 sends a corresponding control signal to the driving unit 32 to reduce the on time ton of the first transistor Q1 gradually, so as to reduce the current I4; when the current I4 is small enough, the inductance current IL is zero-crossing, and the step-down light-load mode shown in FIG. 5 is entered; when the second load 2 is large enough, the buck-boost module 30 enters boost mode and the inductor current IL reverses.
For the discharging state of the above embodiment, when the state of charge of the second battery 20 drops slower than the first battery 10, i.e. the second load 2 is smaller, the control module 50 compensates by controlling the buck-boost module 30 to increase the current I4, as follows:
At this time, the buck-boost module 30 operates in the buck mode, defining that the first transistor Q1 and the second transistor Q2 are turned on to be high level and turned off to be low level, defining that the current IL flowing through the inductor L is positive during buck, the control module 50 obtains control waveforms of the first transistor Q1, the second transistor Q2 and the inductor current IL by sending corresponding control signals to the driving unit 32, as shown in fig. 6, the first transistor Q1 is turned on for a time ton and is input to the inductor for charging, and the first transistor Q1 is turned off for a time toff and is inductively discharged, so that the current I3 is about the average value of the inductor current IL. The switching period t=ton+toff of Pulse Width Modulation (PWM), and the time period ton is adjusted to control the magnitude of the current I3 and the current I4, so as to realize the regulation and control of the electric quantity balance of the first battery 10 and the second battery 20.
For the working principle of the control module 50 controlling the buck-boost module 30 to perform corresponding boost or buck for the charge state of the above embodiment, reference may be made to the working principle of the discharge state, which is not repeated herein.
In another embodiment, as shown in fig. 7, the buck-boost module includes a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, a driving unit 32 and a capacitor Cfly, wherein a gate of the third transistor is connected to the driving unit, a source of the third transistor is connected to a positive terminal of the second battery and the second load at the second node, and a drain of the third transistor is connected to the fourth transistor; the grid electrode of the fourth transistor is connected with the driving unit, the source electrode of the fourth transistor is connected with the drain electrode of the third transistor, and the drain electrode of the fourth transistor is connected with the fifth transistor; the grid electrode of the fifth transistor is connected with the driving unit, the source electrode of the fifth transistor is connected with the drain electrode of the fourth transistor, and the drain electrode of the fifth transistor is connected with the sixth transistor; the grid electrode of the sixth transistor is connected with the driving unit, the source electrode of the sixth transistor is connected with the drain electrode of the fifth transistor, and the drain electrode of the sixth transistor is grounded; a first end of the capacitor Cfly is connected between the drain of the third transistor and the source of the fourth transistor, and a second end of the capacitor Cfly is connected between the drain of the fifth transistor and the source of the sixth transistor; the drain electrode of the fourth transistor or the source electrode of the fifth transistor is also connected to the positive terminal of the first battery and the first load at the first node, respectively.
The control principle of the buck-boost module of this embodiment is as follows: as shown in fig. 8, in the charge/discharge process, when the electric quantity of the second battery 20 is higher than that of the first battery 10, i.e. VBAT2 > VBAT1, the control module 50 controls the driving unit 32 to operate in the step-down mode, the input voltage is VBAT1+vbat2, the output voltage is VBAT1, the third transistor Q3 and the fifth transistor Q5 are turned on in the period t1, and the capacitor Cfly is charged; during period t2, the capacitor Cfly releases energy to VBAT 1.
When the electric quantity of the first battery 10 is higher than that of the second battery 20, i.e., VBAT1 > VBAT2, the control module 50 controls the driving unit 32 to operate in the boost mode, the input voltage is VBAT1, the output voltage is VBAT1+vbat2, the fourth transistor Q4 and the sixth transistor Q6 are turned on in the period t1, and the capacitor Cfly is charged; during period t2, the capacitor Cfly releases energy to VBAT1+ VBAT 2.
The step-up/down module 30 of the above embodiment may realize both the step-down and the step-up.
In the embodiment of the present application, the capacity of the first battery 10 is different from the capacity of the second battery 20.
For example, the capacity of the first battery 10 is Cap1, the capacity of the second battery 20 is Cap2, and the caps 1 and Cap2 may be initially designed according to the power consumption ratio of the second load 2 with high operating voltage, for example, by counting the average power consumption distribution ratio of the usage scenario of the user every day under a certain number of user samples, the second load 2 accounts for about 23%, and the approximate ratio of the power consumption P2 of the second load 2 to the power consumption P1 of the first load 1 with low operating voltage is:
By the regulation of the buck-boost module 30, the states of charge of the two first batteries 10 and the second battery 20 can be made to be nearly synchronous, i.e., vbat1≡vbat2.
The capacity ratio of the first battery 10 and the second battery 20 can be approximately designed as follows:
if the battery capacity of the electronic device is 5000mAh, the electronic device may be designed according to the capacity of the first battery, cap1 = 652mAh, and the capacity of the second battery, cap2 = 4348 mAh. The above method is only a rough estimation method, and can be actually adjusted according to the load power consumption condition and the control capability of the buck-boost module.
The batteries with different capacities can be used for realizing series charging, so that the charging speed is improved, and the stacking difficulty is reduced.
In other embodiments, the capacities of the first battery and the second battery may be the same, and the batteries with the same capacity may solve the problem of balancing the electric quantity caused by the aging speed and the like in the serial charging process.
In this embodiment of the present application, through being connected the positive terminal of first battery with the negative terminal of second battery, first load respectively, the positive terminal of second battery is connected with second load 2, and the buck-boost module is connected with the positive terminal of first battery, the positive terminal of second battery respectively, buck-boost module can be based on the voltage and the electric current of first battery and voltage and the electric current adjustment of second battery to the power supply of first load, second load, from this through first battery and the second battery of establishing ties, can be at the sum of promotion to the input voltage of high operating voltage load to the voltage of two batteries, reduce high operating voltage load input and output voltage differential, greatly improve the conversion efficiency of power, and provide the voltage of a battery output to low operating voltage load is direct, avoid the buck-boost conversion of voltage, reduce power supply efficiency loss, promote duration. In addition, based on the voltage and the current of the first battery and the second battery, the voltage-boosting module adjusts the power supply to the first load and the second load, so that the states of charge of the first battery and the second battery are synchronous, the overcharge or overdischarge of the batteries is avoided, and the service life of the batteries is prolonged.
As shown in fig. 9, the embodiment of the present application further provides a power supply method applied to the battery circuit described in any one of the embodiments of fig. 1 to 8, where the method includes:
step 102, collecting the voltage of the first battery, the voltage of the second battery, the current flowing through the first battery and the current flowing through the second battery;
step 104, in the case that the state of charge of the first battery is not synchronous with the state of charge of the second battery according to the collected voltage and current, adjusting power supply to the first load and the second load so as to synchronize the state of charge of the first battery with the state of charge of the second battery.
Step 102 may be performed by the acquisition module of the battery circuit, and the same technical effects can be achieved, and in order to avoid repetition, the description is omitted here.
In step 104, optionally, adjusting power supply to the first load and the second load when the current is the current collected in the discharging state of the first battery and the second battery, including: determining whether the state of charge of the first battery is synchronous with the state of charge of the second battery according to the acquired voltage of the first battery and the acquired voltage of the second battery; if not, determining a first power supply current provided to the first load and a second power supply current provided to the second load according to the acquired voltage of the first battery, the acquired voltage of the second battery, the acquired first discharge current flowing through the first battery and the acquired second discharge current flowing through the second battery; and adjusting the second current flowing through the second end of the buck-boost module according to the first power supply current, the second power supply current, the available maximum capacity of the first battery and the available maximum capacity of the second battery to adjust the power supply to the first load and the second load until the state of charge of the first battery is synchronous with the state of charge of the second battery.
In step 104, optionally, adjusting power supply to the first load and the second load when the current is the current collected in the charging states of the first battery and the second battery, including: determining whether the state of charge of the first battery is synchronous with the state of charge of the second battery according to the acquired voltage of the first battery and the acquired voltage of the second battery; if not, determining a third power supply current provided to the second load according to the collected voltage of the first battery, the collected voltage of the second battery, the collected first charging current flowing through the first battery and the collected second charging current flowing through the second battery; and adjusting the second current flowing through the second end of the buck-boost module according to the first charging current, the third power supply current, the available maximum capacity of the first battery and the available maximum capacity of the second battery to adjust power supply to the first load and the second load until the state of charge of the first battery is synchronous with the state of charge of the second battery.
The steps in step 104 may be correspondingly performed by the control module and the voltage raising and lowering module of the battery circuit, and the same technical effects can be achieved, so that repetition is avoided and detailed description is omitted.
In addition, the embodiment of the application also provides electronic equipment, which comprises the battery circuit as described in any one of the embodiments of fig. 1 to 8.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims (14)

1. A battery circuit is characterized by comprising a first battery, a second battery, a buck-boost module, an acquisition module and a control module,
the positive electrode end of the first battery is respectively connected with the negative electrode end of the second battery and the first load, the negative electrode end of the first battery is grounded,
the positive terminal of the second battery is connected with a second load;
the acquisition module is used for acquiring the voltage and the current of the first battery and the voltage and the current of the second battery;
the control module is respectively connected with the acquisition module and the lifting pressure module, and the control module sends control signals to the lifting pressure module based on the voltage and the current of the first battery and the voltage and the current of the second battery acquired by the acquisition module;
the voltage boosting and reducing module is respectively connected with the positive electrode end of the first battery and the positive electrode end of the second battery, and adjusts power supply to the first load and the second load based on the control signals so as to synchronize the charge state of the first battery with the charge state of the second battery.
2. The circuit of claim 1, wherein the circuit comprises a plurality of capacitors,
The first end of the buck-boost module is respectively connected with the positive end of the first battery and the first load at a first node;
the second end of the buck-boost module is respectively connected with the positive end of the second battery and the second load at a second node;
and the third end of the lifting and pressing module is connected with the control module.
3. The circuit of claim 2 wherein the first load is a low operating voltage load and the second load is a high operating voltage load,
and under the condition that the current acquired by the acquisition module is discharge current, the control module controls the voltage boosting and reducing module to adjust the first current flowing through the second end of the voltage boosting and reducing module according to the first discharge current flowing through the first battery, the second discharge current flowing through the second battery, the available maximum capacity of the first battery and the available maximum capacity of the second battery so as to synchronize the charge state of the first battery with the charge state of the second battery.
4. The circuit of claim 2 wherein the first load is a low operating voltage load and the second load is a high operating voltage load,
And under the condition that the current acquired by the acquisition module is the charging current, the control module controls the voltage boosting and reducing module to adjust the second current flowing through the second end of the voltage boosting and reducing module according to the first charging current flowing through the first battery, the second charging current flowing through the second battery, the available maximum capacity of the first battery and the available maximum capacity of the second battery so as to synchronize the charge state of the first battery with the charge state of the second battery.
5. The circuit of claim 4, further comprising a charging module,
the first end of the charging module is connected with an external power supply, the second end of the charging module is connected with the first load, the third end of the charging module is respectively connected with the positive end of the first battery and the first end of the lifting pressure module at the first node, and the fourth end of the charging module is connected with the control module;
the control module is also used for controlling the charging module to charge the first battery and charge the second battery through the lifting and pressing module according to the current and the voltage acquired by the acquisition module.
6. The circuit of claim 5, wherein the charging module has a path management function, and wherein the first battery supplies power to the first load through path management of the charging module in a discharged state; and in a charging state, the charging module converts energy of the external power supply and supplies power to the first battery, the second battery and the first load respectively.
7. The circuit of any one of claims 3-6, wherein the buck-boost module includes a first transistor, a second transistor, a drive unit, and an inductor,
the grid electrode of the first transistor is connected with the driving unit, the source electrode of the first transistor is connected with the positive electrode end of the second battery and the second load at the second node respectively, and the drain electrode of the first transistor is connected with the second transistor;
the grid electrode of the second transistor is connected with the driving unit, the source electrode of the second transistor is connected with the drain electrode of the first transistor, and the drain electrode of the second transistor is grounded;
the first end of the inductor is connected between the drain electrode of the first transistor and the source electrode of the second transistor, and the second end of the inductor is respectively connected with the positive end of the first battery and the first load at the first node.
8. The circuit of any one of claims 3-6, wherein the buck-boost module includes a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a drive unit, and a capacitor,
the grid electrode of the third transistor is connected with the driving unit, the source electrode of the third transistor is respectively connected with the positive electrode end of the second battery and the second load at the second node, and the drain electrode of the third transistor is connected with the fourth transistor;
The grid electrode of the fourth transistor is connected with the driving unit, the source electrode of the fourth transistor is connected with the drain electrode of the third transistor, and the drain electrode of the fourth transistor is connected with the fifth transistor;
the grid electrode of the fifth transistor is connected with the driving unit, the source electrode of the fifth transistor is connected with the drain electrode of the fourth transistor, and the drain electrode of the fifth transistor is connected with the sixth transistor;
the grid electrode of the sixth transistor is connected with the driving unit, the source electrode of the sixth transistor is connected with the drain electrode of the fifth transistor, and the drain electrode of the sixth transistor is grounded;
a first end of the capacitor is connected between the drain of the third transistor and the source of the fourth transistor, and a second end of the capacitor is connected between the drain of the fifth transistor and the source of the sixth transistor;
the drain electrode of the fourth transistor or the source electrode of the fifth transistor is also connected to the positive terminal of the first battery and the first load at the first node, respectively.
9. The circuit of claim 1, wherein a capacity of the first battery is different from a capacity of the second battery.
10. The circuit of claim 1, wherein the collection module comprises a first sampling resistor and a first current collection unit, a second sampling resistor and a current collection unit, and a first voltage collection unit and a second voltage collection unit,
the first sampling resistor is connected between the negative end of the first battery and the ground, and the first current acquisition unit acquires the current flowing through the first battery by acquiring the voltage at two ends of the first sampling resistor and the resistance value of the first sampling resistor;
the second sampling resistor is connected between the negative electrode end of the second battery and the positive electrode end of the first battery, and the second current acquisition unit acquires the current flowing through the second battery by acquiring the voltage at the two ends of the second sampling resistor and the resistance value of the second sampling resistor;
the first voltage acquisition unit is connected with the positive electrode end of the first battery and is used for acquiring the voltage of the first battery;
the second voltage acquisition unit is connected with the positive electrode end of the second battery and is used for acquiring the voltage of the second battery;
the control module is connected with the acquisition module and is used for sending the control signal to the third end of the lifting pressure module according to the current and the voltage acquired by the acquisition module.
11. A power supply method, characterized by being applied to the battery circuit according to any one of claims 1 to 10, comprising:
collecting the voltage of the first battery, the voltage of the second battery, the current flowing through the first battery and the current flowing through the second battery;
and in the case that the state of charge of the first battery is not synchronous with the state of charge of the second battery according to the acquired voltage and current, adjusting power supply to the first load and the second load so as to synchronize the state of charge of the first battery with the state of charge of the second battery.
12. The method of claim 11, wherein adjusting the power to the first load, the second load, if the current is the current drawn by the first battery, the second battery being discharged, comprises:
determining whether the state of charge of the first battery is synchronous with the state of charge of the second battery according to the acquired voltage of the first battery and the acquired voltage of the second battery;
if not, determining a first power supply current provided to the first load and a second power supply current provided to the second load according to the acquired voltage of the first battery, the acquired voltage of the second battery, the acquired first discharge current flowing through the first battery and the acquired second discharge current flowing through the second battery;
And adjusting the second current flowing through the second end of the buck-boost module according to the first power supply current, the second power supply current, the available maximum capacity of the first battery and the available maximum capacity of the second battery to adjust the power supply to the first load and the second load until the state of charge of the first battery is synchronous with the state of charge of the second battery.
13. The method of claim 11, wherein adjusting the power to the first load, the second load, if the current is the current drawn by the first battery, the second battery, and the state of charge comprises:
determining whether the state of charge of the first battery is synchronous with the state of charge of the second battery according to the acquired voltage of the first battery and the acquired voltage of the second battery;
if not, determining a third power supply current provided to the second load according to the collected voltage of the first battery, the collected voltage of the second battery, the collected first charging current flowing through the first battery and the collected second charging current flowing through the second battery;
and adjusting the second current flowing through the second end of the buck-boost module according to the first charging current, the third power supply current, the available maximum capacity of the first battery and the available maximum capacity of the second battery to adjust power supply to the first load and the second load until the state of charge of the first battery is synchronous with the state of charge of the second battery.
14. An electronic device comprising a battery circuit as claimed in any one of claims 1 to 10.
CN202310555662.4A 2023-05-16 2023-05-16 Battery circuit and power supply method Pending CN116566008A (en)

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Application Number Priority Date Filing Date Title
CN202310555662.4A CN116566008A (en) 2023-05-16 2023-05-16 Battery circuit and power supply method

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Application Number Priority Date Filing Date Title
CN202310555662.4A CN116566008A (en) 2023-05-16 2023-05-16 Battery circuit and power supply method

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CN116566008A true CN116566008A (en) 2023-08-08

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