CN116566008A - Battery circuit and power supply method - Google Patents

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 in particular relates to a battery circuit and a power supply method.

Background technique

Electronic devices generally include processors, memory, charging modules, power management modules, batteries, antennas, radio frequency modules, audio modules, speakers, receivers, microphones, sensors, motors, cameras, displays, etc. The source of power is a battery or a charger, and the working voltage of a lithium-ion battery is generally in the range of 3.0V to 4.5V.

However, due to the different designs and manufacturing processes of different modules of electronic equipment, there are large differences in power supply characteristics. For example, the working voltage of processors, memories, sensors, and cameras is generally below 1.8V, and the battery needs to step down to supply power to these modules. Display screens, high-voltage linear motors, and some audio modules require working voltages of 5V and above, and the battery needs to step down the voltage to supply power to these modules.

When two or more batteries are used to power electronic equipment, they are generally connected in series or in parallel. Multi-battery power supply in series requires the capacity of each battery to be the same, to avoid overcharging or overdischarging of some batteries, and has high requirements for stacking, and the power supply link from the battery to the load must first go through the process of stepping down and then boosting, resulting in a large loss of efficiency. Large, not conducive to the improvement of battery life. For the load with high working voltage, the voltage difference between the input and output voltage is relatively large when multiple batteries are connected in parallel, and the conversion efficiency of the power supply is low.

Contents of the invention

The purpose of the embodiments of the present application is to provide a battery circuit and a power supply method, which can solve the problem of low power supply efficiency.

In the first aspect, the 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, the positive terminal of the first battery is connected to the second battery The negative terminal of the first battery is connected to the first load, the negative terminal of the first battery is connected to the ground, and the positive terminal of the second battery is connected to the second load; the collection module is used to collect the voltage and current of the first battery and the voltage and current of the second battery; the control module is connected to the acquisition module and the buck-boost module respectively, and the control module is based on the voltage and current of the first battery collected by the acquisition module , the voltage and current of the second battery send control signals to the buck-boost module; the buck-boost module is respectively connected to the positive terminal of the first battery and the positive terminal of the second battery, the The buck-boost module adjusts the power supply to the first load and the second load based on the control signal so that the state of charge of the first battery is synchronized with the state of charge of the second battery.

In the second aspect, the embodiment of the present application provides a power supply method, which is applied to the battery circuit described in the first aspect above, 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;

When it is determined according to the collected voltage and current that the state of charge of the first battery is not synchronized with the state of charge of the second battery, adjusting the power supply to the first load and the second load so that The state of charge of the first battery is synchronized with the state of charge of the second battery.

In a third aspect, an embodiment of the present application provides an electronic device, including the battery circuit described in the first aspect above.

In the embodiment of the present application, by connecting the positive end of the first battery to the negative end of the second battery and the first load respectively, the positive end of the second battery is connected to the second load 2, and the buck-boost module is respectively connected to the first load. The positive terminal of the first battery and the positive terminal of the second battery are connected, and the buck-boost module can adjust the power supply to the first load and the second load based on the voltage and current of the first battery and the voltage and current of the second battery, by By connecting the first battery and the second battery in series, the input voltage to the high operating voltage load can be increased to the sum of the voltages of the two batteries, reducing the voltage difference between the input and output voltage of the high operating voltage load, and greatly improving the conversion of the power supply Efficiency, and directly provide a battery output voltage to the low working voltage load, avoid voltage up-down conversion, reduce power supply efficiency loss, and improve battery life. In addition, based on the voltage and current of the first battery and the second battery, the buck-boost module adjusts the power supply to the first load and the second load, so that the state of charge of the first battery and the second battery can be synchronized, avoiding the existence of batteries Overcharge or overdischarge, improve battery life.

Description of drawings

FIG. 1 is a structural block diagram of a battery circuit according to an embodiment of the present application.

FIG. 2 is a schematic circuit diagram of a battery circuit according to an embodiment of the present application.

FIG. 3 is a schematic circuit diagram of a battery circuit corresponding to a discharge state according to an embodiment of the present application.

FIG. 4 is a schematic circuit diagram of a battery circuit corresponding to a charging state according to an embodiment of the present application.

Fig. 5 is a schematic diagram of the working principle of the buck-boost module according to an embodiment of the present application.

Fig. 6 is a schematic diagram of the working principle of the buck-boost module according to an embodiment of the present application.

FIG. 7 is a schematic circuit diagram of a battery circuit according to another embodiment of the present application.

FIG. 8 is a schematic diagram of a working principle of a buck-boost module according to another embodiment of the present application.

FIG. 9 is a schematic flowchart of a power supply method according to an embodiment of the present application.

Detailed ways

The following will clearly describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein, and that references to "first," "second," etc. distinguish Objects are generally of one type, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

The battery circuit and power supply method provided by the embodiments of the present application will be described in detail below through specific embodiments and application scenarios with reference to the accompanying drawings.

Fig. 1 is a structural block diagram of the battery circuit of the embodiment of the present application, as shown in Fig. 1, the battery circuit includes a first battery 10, a second battery 20, a buck-boost module 30, an acquisition module 40 and a control module 50, the first battery The positive terminal of 10 is respectively connected with the negative terminal of the second battery 20 and the first load 1, the negative terminal of the first battery 10 is grounded, and the positive terminal of the second battery 20 is connected with the second load 2; The module 40 is used to collect the voltage and current of the first battery 10 and the voltage and current of the second battery 20; the control module 50 is respectively connected with the collection module 40 and the buck-boost module 30, The control module 50 sends a control signal to the buck-boost module 30 based on the voltage and current of the first battery 10 and the voltage and current of the second battery 20 collected by the collection module 40; The voltage module 30 is respectively connected to the positive terminal of the first battery 10 and the positive terminal of the second battery 20. The power supply of the two loads 2 synchronizes 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 to the negative terminal of the second battery 20, the negative terminal of the first battery 10 is grounded through the ground terminal GND, the positive terminal of the first battery 10 is also connected to the first load 1, and can directly output voltage, Supply power to the first load 1 . The positive end of the second battery 20 is connected to the second load 2 , and the voltages output by 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 can be lithium batteries, and the operating voltage range of the lithium batteries is in the range of 3.0V to 4.5V, so the voltage provided by the first battery 10 to the first load 1 can reach up to 4.5V, and the series connection The voltage provided by the first battery 10 and the second battery to the second load 2 can be up to 9V. The first load 1 is a high working voltage load, and the second load 2 is a low working voltage load.

Since the first load 1 and the second load 2 are determined based on scenarios used by users, their sizes are uncontrollable. Therefore, there will be situations where the power consumption of the first load 1 and the second load 2 are different, so that the state of charge (SOC) of the first battery 10 and the second battery 20 is different, which in turn leads to overcharging or overdischarging of a certain battery phenomenon, causing damage to the battery.

The collection module 40 can collect data such as the voltage and current of the first battery 10 and the voltage and current of the second battery 20 respectively, and the control module 50 is connected with the collection module 40, so that the collection data of the collection module 40 can be obtained, and the second battery can be judged accordingly. Whether the current states of charge of the first battery 10 and the second battery 20 are different. And when the state of charge is different, send a control signal to the buck-boost module 30 to control the buck-boost module 30 to adjust the voltage provided by the first battery 10 and the second battery 20 to the first load 1 and the second load 2 .

In the embodiment of the present application, the buck-boost module 30 is connected to the positive terminal of the first battery 10 and the positive terminal of the second battery 20 respectively, that is, the buck-boost module 30 can be connected to the first load 1 and the second load 2 , forming the corresponding current path.

Referring to FIG. 1 , the first end of the buck-boost module 30 is respectively connected to the positive end of the first battery 10 and the first load 1 at the first node A; the second end of the buck-boost module 30 terminals are respectively connected to the positive terminal of the second battery 20 and the second load 2 at the second node B; the third terminal of the buck-boost module 30 is connected to the control module 50 .

In addition to forming a path for connecting to the first load 1 , the first battery 10 may also form a path for connecting to the second load 2 with the buck-boost module 30 . Thus, the voltage output from the positive terminal of the first battery 10 can directly supply power to the first load 1, or can be used to supply power to the first load 1 with the buck-boost module 30, and can also be used to supply power to the second load 2 with the buck-boost module 30. .

Similarly, in addition to forming a path for connecting to the second load 2 , the second battery 20 can also form a path for connecting to the first load 1 with the buck-boost module 30 . Thus, the second load 2 can be directly powered by the voltage output from the positive terminal of the second battery 20 , or can be combined with the buck-boost module 30 to supply power to the second load 2 .

As shown in FIG. 1 , the third terminal of the buck-boost module 30 and the control module 50 are used to receive the control signal sent by the control module 50 . The working principle of how the control module 50 sends the control signal so that the buck-boost module 30 correspondingly adjusts the power supply to the first load 1 and the second load 2 will be described below.

As mentioned above, the collection module 40 is used to collect the voltage and current of the first battery 10 and the second battery 20 . With reference to Fig. 2, in one embodiment, acquisition module 40 comprises the first sampling resistance Rsense1 and the first current acquisition unit Isns1, the second sampling resistance Rsense2 and current acquisition unit Isns2, and the first voltage acquisition unit Vsns1 and the second voltage acquisition unit 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 acquisition unit Isns1 collects the voltage at both ends of the first sampling resistor Rsense1 and the first The resistance value of a sampling resistor Rsense1 is used to collect the current flowing through the first battery 10; 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 , the second current collection unit Isns2 collects the current flowing through the second battery 20 by collecting the voltage across the second sampling resistor Rsense2 and the resistance value of the second sampling resistor Rsense2; the first voltage The collection unit Vsns is connected to the positive terminal of the first battery 10 for collecting the voltage of the first battery 10; the second voltage collection unit Vsns2 is connected to the positive terminal of the second battery 20 for collecting The voltage of the second battery 20; the control module 50 is connected to the collection module 40, and is used to send the voltage to the third terminal of the buck-boost module 30 according to the current and voltage collected by the collection module 40. control signal.

The collection module 40 includes a module for collecting current signals and a module for collecting voltage signals. In the embodiment of FIG. module, the first sampling resistor Rsense1 is connected between the negative terminal of the first battery 10 and the ground. In other embodiments, current collection may also be performed by using MOS transistors instead of sampling resistors, and the present application is not limited to the above specific embodiments.

The first current acquisition unit Isns1 is connected to both ends of the first sampling resistor Rsense1 to collect voltage signals at each end, then by dividing the voltage difference between the two ends of the first sampling resistor Rsense1 by the resistance value of the first sampling resistor Rsense1 , the current flowing through the first sampling resistor Rsense1 can be obtained, and the current flowing through the first sampling resistor Rsense1 is the current flowing through the first battery 10 .

Similarly, the second sampling resistor Rsense2 and the second current acquisition unit Isns2 form 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 between.

The voltage signal at each end is collected by connecting the two ends of the second sampling resistor Rsense2 through the second current acquisition unit Isns2, then by dividing the voltage difference between the two ends of the second sampling resistor Rsense2 by the resistance value of the second sampling resistor Rsense2 , 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 used to acquire the voltage VBAT1 of the first battery 10, and the voltage at the first node A when discharging and supplying power to the first load 1 for VBAT1. The second voltage collection unit Vsns2 is connected to the positive terminal of the second battery 20 for collecting the voltage VBAT2 of the second battery 20. When discharging and supplying power to 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 combined 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 realized by collaborating with the buck-boost module 30 .

As mentioned above, when the battery discharges to supply power to the load, the voltage at the first node A can be VBAT1, the voltage at the second node B can be VBAT1+VBAT2, the voltage at the first node B is greater than the voltage at the second node A, Therefore, 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 within the operating voltage range corresponding to the load, and there is no second load 2 with a high operating voltage. The input and output voltage difference is large In the case of the power supply, the conversion efficiency of the power supply is improved. There is also no need to use other boost modules or step-down modules to avoid a large loss of efficiency, which is conducive to improving battery life.

As mentioned above, since the first load 1 and the second load 2 are determined based on the scene used by the user, when the power consumption of the first load 1 and the second load 2 are different, the load of the first battery 10 will be The state of charge of the first battery 10 and the state of charge of the second battery 20 are different or not synchronized. In the process of supplying power to the first load 1 and the second load 2, it is necessary to control the synchronization of the state of charge of the first battery 10 and the second battery 20 in real time. Thus, the power supply to the first load 1 and the second load 2 is adjusted.

For the discharge state and the charge state, the current and voltage corresponding to the first battery 10 and the second battery 20 are different, and the ways in which the buck-boost module 30 adjusts the power supply to the first load 1 and the second load 2 are also different.

Optionally, the first load 1 is a low operating voltage load, and the second load 2 is a high operating voltage load. When the current collected by the acquisition module 40 is a discharge current, the control module 50 according to a first discharge current flowing through the first battery 10 , a second discharge current flowing through the second battery 20 , the maximum available capacity of the first battery 10 and the maximum available capacity of the second battery 20 , controlling the buck-boost module 30 to adjust the first current flowing through the second terminal of the buck-boost module 30, so that the state of charge of the first battery 10 is synchronized with the state of charge of the second battery 20 .

In the discharge state, as shown in FIG. 3 , the power supply voltage of the second load 2 is increased to VBAT1+VBAT2 after the first battery 10 and the second battery 20 are connected in series, which can greatly improve the power supply efficiency.

The discharge current of the first battery 10 is I1, and the discharge current of the second battery 20 is I2. The second terminal of the buck-boost module 30 is a port connected to the second node B, and the current flowing through the second terminal of the buck-boost module 30 is I4. The first terminal of the buck-boost module 30 is a port connected to the first node A, and the current flowing through the first terminal of the buck-boost module 30 is I3.

When the buck-boost module 30 works in the step-down mode, the corresponding input current is current I4, and the output current is current I3, then the corresponding input voltage is VBAT1+VBAT2, the output voltage is VBAT1, and the conversion efficiency is η0:

Current input to first load 1:

Current into the second load 2:

I2=I4+Iload2

While the first battery 10 and the second battery 20 are discharged in series to supply power to the load, 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 can regulate the buck-boost 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 generally be expressed as a function: SOC=f(Q, OCV, T), wherein Q represents the Coulomb integral of the current I and time t; OCV is the open circuit voltage , used for calibration and power correction; T represents the battery temperature.

When the open circuit voltage OCV does not reach the calibration condition and the temperature T is the same, the state of charge SOC1 of the first battery 10 and the state of charge SOC2 of the second battery 20 are estimated based on the current integral:

Wherein, Qmax1 and Qmax2 represent the available maximum capacity of the first battery 10 and the second battery 20 respectively.

In order to keep the state of charge of the first battery 10 and the second battery 20 synchronized, f(Q1)=f(Q2), then when the state of charge is synchronized, VBAT1≈VBAT2, due to the current Iload1 input to the first load 1 and the input current Iload1 The current Iload2 of the second load 2 is determined by the user scenario and is uncontrollable. According to f(Q1)=f(Q2), it can be deduced as follows:

In the above formula, the current Iload1 and the current Iload2 are related to the user scene and can be represented by I1 and I2, while η0 is a fixed value, Qmax1 and Qmax2 are known values obtained through the acquisition module 40, and I4 is a value that can be adjusted through the control module 50 variable, SOC1=SOC2 can be achieved by adjusting the current I4.

The control module 50 can judge whether the current state of charge of the first battery 10 and the second battery 20 are synchronized by judging whether the voltage VBAT1 of the first battery 10 collected by the collection module is equal to the voltage VBAT1 of the second battery 20 . When |VBAT1-VBAT2|<△V0, that is, when the voltage difference between VBAT1 and VBAT2 is within a certain threshold △V0, VBAT1≈VBAT2, it is judged to be synchronous; otherwise, it is not synchronous.

When it is determined that the state of charge of the first battery 10 is not synchronized with the state of charge of the second battery 20 , according to the collected voltage of the first battery 10 , the voltage of the second battery 20 and the first discharge flowing through the first battery 10 The current, the second discharge current flowing through the second battery 20 , determines the current Iload1 supplied to the first load 1 and the current Iload2 supplied to the second load 2 .

According to parameters such as current Iload1 and current Iload2, the available maximum capacity of the first battery 10 and the available maximum capacity of the second battery 20, the size of the current I4 flowing through the second end of the buck-boost module 30 is adjusted in combination with the above formula (2), and the current I4 is adjusted by The power supply to the first load 1 and the second load 2 is adjusted until it is detected that |VBAT1-VBAT2|

When the control module 50 detects that the state of charge of the second battery 20 drops faster than the first battery 10, that is, when the second load 2 is relatively large, the buck-boost module 30 works in a buck mode, as shown in FIG. 3 The module 30 works in the step-down mode, and the current direction of the current I4 is positive, and the buck-boost module 30 is controlled to reduce the current I4 to compensate; if the second load 2 is very large, the buck-boost module 30 can work in the boost mode , the buck-boost module 30 works in the boost mode, the current I4 is reversed, and the first battery 10 is reversely boosted by the buck-boost module 30 to supply power to the second load 2, reducing the power consumption of the second battery 20, and at the same time The power consumption of the first battery 10 is increased to compensate, so that the state of charge of the first battery 10 is synchronized with that of the second battery 20 .

When the state of charge of the second battery 20 drops slower than that of the first battery 10 , that is, when the second load 2 is small, the buck-boost module 30 is controlled to increase the current I4 to compensate. The power consumption of the second battery 20 is increased while the power consumption of the first battery 10 is decreased to compensate, so that the state of charge of the second battery 20 is synchronized with that of the first battery 10 .

In another embodiment, the first load 1 is a low operating voltage load, and the second load 2 is a high operating voltage load. When the current collected by the acquisition module 40 is a charging current, the control The module 50 is based on 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 capacity of the second battery 20 maximum capacity, controlling the buck-boost module 30 to adjust the second current flowing through the second terminal of the buck-boost module 30, so that the state of charge SOC of the first battery 10 is the same as that of the second battery 20 State of charge SOC synchronization.

In the charging state, the control module 50 can determine whether the current state of charge of the first battery 10 and the second battery 20 is equal by judging whether the voltage VBAT1 of the first battery 10 collected by the collection module 40 is equal to the voltage VBAT1 of the second battery 20 Synchronize. When |VBAT1-VBAT2|<△V0, that is, when the voltage difference between VBAT1 and VBAT2 is within a certain threshold △V0, it is judged to be synchronous; otherwise, it is not synchronous.

When it is determined that the state of charge of the first battery 10 is not synchronized with the state of charge of the second battery 20 , according to the collected voltage of the first battery 10 , the voltage of the second battery 20 and the first discharge flowing through the first battery 10 The current, the second discharge current flowing through the second battery 20 , determines the current Iload1 supplied to the first load 1 and the current Iload2 supplied to the second load 2 .

The buck-boost conversion module 30 works in the boost mode, the input current of the first terminal of the buck-boost module 30 is , and the output current of the second terminal of the buck-boost module 30 is for charging the second battery 20 and for the second load 2 at the same time. powered by.

According to parameters such as current Iload1 and current Iload2, the available maximum capacity of the first battery 10 and the available maximum capacity of the second battery 20, the size of the current I4 flowing through the second end of the buck-boost module 30 is adjusted in combination with the above formula (2), and the current I4 is adjusted by The power supply to the first load 1 and the second load 2 is adjusted until it is detected that |VBAT1-VBAT2|

When the control module 50 detects that the state of charge of the second battery 20 rises faster than that of the first battery 10, that is, when the charging current for charging the second battery 20 is relatively large, it controls the buck-boost module 30 to reduce the voltage flowing through the buck-boost module. The output current of the second terminal of 30 is compensated. The buck-boost module 30 can even stop working, and the output current at the second terminal is 0, so as to ensure that the state of charge of the second battery 20 and the first battery 10 increase synchronously.

When the state of charge of the second battery 20 drops slower than that of the first battery 10 , that is, when the second load 2 is small, the buck-boost module 30 is controlled to increase the output current of the second terminal to compensate. Thus, 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 that of the first battery 10 .

In one embodiment, the battery circuit further includes a charging module, the first end of the charging module is connected to an external power supply, the second end of the charging module is connected to the first load 1, and the third end of the charging module The first node A is respectively connected to the positive terminal of the first battery 10 and the first terminal of the buck-boost module 30, and the fourth terminal of the charging module is connected to the control module 50; the The control module 50 is also used 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 voltage collected by the collection module 40 .

As shown in Figure 2, one end of the charging module 60 is connected to the charger 70, the second end of the charging module 60 is connected to the first load 1, and the third end of the charging module 60 is connected to the positive terminal of the first battery 10 and the buck-boost module 30 on the first end.

The charging module has a path management function. In a discharging state, the first battery supplies power to the first load through the path management of the charging module; and in a charging state, the charging module converts the energy of the external power supply into Then supply 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 cooperates with the buck-boost module 30 to charge the second battery 20 . Meanwhile, the charging module 60 has a path management function. When discharging, the first battery 10 supplies power to the first load 1 through the path management of the charging module 60; when charging, the energy of the charger 70 is converted by the charging module 60, while charging the first battery 10 and the second battery 20, Supply power to the first load 1 .

In the discharging state, as shown in FIG. 4 , when the user connects the charger 70 to charge, after being converted by the charging module 60, the charging current is divided into two directions at the first node A to respectively charge the first battery 10 and the second battery. 20 for charging, 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 at the same time. At this time, the buck-boost module 30 works in the boost model.

The total current output by the charging module 60 is Ichg, and the charging module 60 has a path management function, so the first load 1 can be directly provided with a current Iload1 by the charging module 60, the charging current of the first battery 10 is Ichg1=Ichg0+Ichg2, and the second battery 20 The charging current of the buck-boost module 30 is Ichg2. When the buck-boost module 30 works in the boost mode, the current output by the buck-boost module 30 corresponding to the second terminal at the second node B is Ichg4. The buck-boost module 30 works as shown in FIG. 4 In the boost mode, the current Ichg4 is reversed, while the current Ichg2 is used to charge the second battery 20 and provide the second load 2 with the current Iload2. The buck-boost module 30 corresponds to the current input by the first terminal at the first node A as Ichg3, the output voltage corresponding to the second terminal of the buck-boost module 30 is VBAT1+VBAT2, and the first terminal of the buck-boost module 30 corresponds to The input voltage is VBAT1, and the conversion efficiency is η1:

Ichg2=Ichg4-Iload2

In the case that the open circuit voltage OCV does not reach the calibration condition and the temperature T is the same, the state of charge of the first battery 10 and the second battery 20 is estimated based on the current integral:

In order to keep the state of charge of the first battery 10 and the second battery 20 synchronized, f(Q1)=f(Q2), when the state of charge is the same, VBAT1≈VBAT2, due to the current Iload1 input to the first load 1 and the current Iload1 input to the second The current Iload2 of load 2 is determined by the user scenario and is uncontrollable. According to f(Q1)=f(Q2), it can be deduced as follows:

In the above formula, the current Iload2 is related to the user scene, and η1 is a fixed value, Qmax1, Qmax2 and current Ichg1 are known values obtained through the acquisition module 40, and Ichag4 is a variable that can be regulated by the control module 50, so by adjusting the current Ichg4 SOC1=SOC2 can be achieved.

The control module 50 can judge whether the current state of charge of the first battery 10 and the second battery 20 are synchronized by judging whether the voltage VBAT1 of the first battery 10 collected by the collection module is equal to the voltage VBAT1 of the second battery 20 . When |VBAT1-VBAT2|<△V0, that is, when the voltage difference between VBAT1 and VBAT2 is within a certain threshold △V0, it is judged to be synchronous; otherwise, it is not synchronous.

When it is determined that the state of charge of the first battery 10 is not synchronized with the state of charge of the second battery 20 , according to the collected voltage VBAT1 of the first battery 10 , the voltage VBAT2 of the second battery 20 and the first battery 10 flowing through the first battery 10 A charging current Ichg1 and a second charging current Ichg2 flowing through the second battery 20 determine the current Iload2 provided to the second load 2 .

According to the parameters of 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 current flowing through the second terminal of the buck-boost module 30 is adjusted in combination with the above formula (3). Ichg4, thereby adjusting the power supply to the first load 1 and the second load 2 until |VBAT1-VBAT2|<△V0 is detected, that is, the state of charge of the first battery 10 is synchronized with the state of charge of the second battery 20 stop the adjustment.

When the control module 50 detects that the state of charge of the second battery 20 rises faster than that of the first battery 10, that is, when the charging current lchg2 of the second battery 20 is relatively large, it compensates by controlling the buck-boost module 30 to reduce the current Ichg4 to ensure that the second battery 20 The state of charge of the second battery 20 rises synchronously with that of the first battery 10 .

When the control module 50 detects that the state of charge of the second battery 20 rises slower than that of the first battery 10, that is, when the second load 2 is small, it compensates by controlling the buck-boost module 30 to increase the current Ichg4 to ensure that the second battery 20 is compatible with the first battery 10. The state of charge of a battery 10 rises synchronously.

In one embodiment, as shown in FIG. 2 to FIG. 4 , the buck-boost module includes a first transistor Q1, a second transistor Q2, a drive unit 32 and an inductor L, and the gate of the first transistor Q1 is connected to the drive unit 32, the source of the first transistor Q1 is respectively connected to the positive terminal of the second battery and the second load at the second node B, and the drain of the first transistor Q1 is connected to the The second transistor Q2 is connected; the gate of the second transistor Q2 is connected to the driving unit, the source of the second transistor Q2 is connected to the drain of the first transistor Q1, and the second transistor Q2 The drain of the inductor L 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 between the first transistor Q1 and the source of the second transistor Q2. The nodes are respectively connected to the positive terminal of the first battery and the first load.

For the discharge state of the above embodiment, when the control module 50 detects that the state of charge of the second battery 20 drops faster than that of the first battery 10, the control module 50 reduces the current by controlling the buck-boost module 30 of the embodiment shown in FIG. 2 to FIG. 4 I4 compensates, the specific principle is as follows:

It is defined that the first transistor Q1 and the second transistor Q2 are turned on as a high level, and that they are turned off as a low level, and that the current IL flowing through the inductor L during step-down is defined as positive, then the first transistor Q1, the second transistor Q2 and The control waveform of the inductor current IL is shown in FIG. 5 . When in the step-down mode, if the second load 2 gradually becomes larger, the control module 50 sends a corresponding control signal to the driving unit 32 to gradually reduce the voltage of the first transistor Q1. The on-time ton reduces the current I4; when the current I4 is small enough and the inductor current IL crosses zero, it enters the step-down light load mode shown in FIG. 5; when the second load 2 is large enough, the buck-boost module 30 enters voltage mode, the inductor current IL reverses.

For the discharge state of the above embodiment, when the state of charge of the second battery 20 drops slower than that of the first battery 10, that is, when the second load 2 is small, the control module 50 compensates by controlling the buck-boost module 30 to increase the current I4, specifically The principle is as follows:

At this time, the buck-boost module 30 works in the step-down mode, and the first transistor Q1 and the second transistor Q2 are defined as high level when they are turned on and low level when they are turned off, and the current IL flowing through the inductor L during step-down is defined as positive , then the control module 50 sends the corresponding control signal to the driving unit 32 to obtain the control waveforms of the first transistor Q1 and the second transistor Q2 and the inductor current IL as shown in FIG. The inductor is charged, and the inductor is discharged within the off time toff of the first transistor Q1, so the current I3 is approximately the average value of the inductor current IL. The pulse width modulation (PWM) switching period T=ton+toff, by adjusting the time length of ton, the magnitude of the current I3 and the current I4 can be controlled, and the balance of the first battery 10 and the second battery 20 can be adjusted.

For the charging state of the above embodiment, the working principle of the control module 50 controlling the buck-boost module 30 to boost or buck the voltage can refer to the working principle of the above-mentioned discharging state, which will not be repeated here.

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. The third transistor The gate of the third transistor is connected to the drive unit, the source of the third transistor is respectively connected to the positive terminal of the second battery and the second load at the second node, and the drain of the third transistor The pole is connected to the fourth transistor; the gate of the fourth transistor is connected to the drive unit, the source of the fourth transistor is connected to the drain of the third transistor, and the drain of the fourth transistor The pole is connected to the fifth transistor; the gate of the fifth transistor is connected to the drive unit, the source of the fifth transistor is connected to the drain of the fourth transistor, and the drain of the fifth transistor The pole is connected to the sixth transistor; the gate of the sixth transistor is connected to the drive unit, the source of the sixth transistor is connected to the drain of the fifth transistor, and the drain of the sixth transistor grounded; the first end of the capacitor Cfly is connected between the drain of the third transistor and the source of the fourth transistor, and the second end of the capacitor Cfly is connected to the drain of the fifth transistor pole and the source of the sixth transistor; the drain of the fourth transistor or the source of the fifth transistor is also connected to the positive terminal of the first battery, the positive terminal of the first battery, and the first node respectively. first load connection.

The control principle of the buck-boost module of this embodiment is as follows: as shown in FIG. 8 , during the charging and discharging process, when the power of the second battery 20 is higher than that of the first battery 10, that is, VBAT2>VBAT1, the control module 50 The driving unit 32 is controlled to work 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; in the period t2, the capacitor Cfly is released to VBAT1 energy.

When the power of the first battery 10 is higher than that of the second battery 20, that is, VBAT1>VBAT2, the control module 50 controls the driving unit 32 to work in the boost mode, the input voltage is VBAT1, and the output voltage is VBAT1+VBAT2, within the period t1 The fourth transistor Q4 and the sixth transistor Q6 are turned on, and the capacitor Cfly is charged; in the period t2, the capacitor Cfly releases energy to VBAT1+VBAT2 .

The buck-boost module 30 in the above-mentioned embodiment can realize both step-down and step-up.

In the embodiment of the present application, the capacity of the first battery 10 is different from that of the second battery 20 .

For example, the capacity of the first battery 10 is Cap1, and the capacity of the second battery 20 is Cap2, then Cap1 and Cap2 can be preliminarily designed according to the power consumption ratio of the second load 2 with high operating voltage, for example, through a certain number of user samples Next, calculate the average power consumption distribution of the user's daily usage scenarios, and the second load 2 accounts for about 23%, then the power consumption P2 of the second load 2 and the power consumption P1 of the first load 1 with low operating voltage are approximately The proportion is:

Through 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 nearly synchronized, that is, VBAT1 ≈ VBAT2 .

Then the capacity ratio of the first battery 10 and the second battery 20 can be roughly designed according to the following formula:

If the battery capacity of the electronic device is 5000mAh, it can be designed according to the capacity Cap1 of the first battery = 652mAh and the capacity of the second battery Cap2 = 4348mAh. The above is only a rough estimation method, and it can be adjusted according to the load power consumption and the control capability of the buck-boost module.

The use of batteries with different capacities can realize series charging, increase the charging speed, and reduce the difficulty of stacking.

In other embodiments, the capacity of the first battery and the second battery can also be the same, and batteries with the same capacity can solve the problem of power balance caused by aging speed and the like during the series charging process.

In the embodiment of the present application, by connecting the positive end of the first battery to the negative end of the second battery and the first load respectively, the positive end of the second battery is connected to the second load 2, and the buck-boost module is respectively connected to the first load. The positive terminal of the first battery and the positive terminal of the second battery are connected, and the buck-boost module can adjust the power supply to the first load and the second load based on the voltage and current of the first battery and the voltage and current of the second battery, by By connecting the first battery and the second battery in series, the input voltage to the high operating voltage load can be increased to the sum of the voltages of the two batteries, reducing the voltage difference between the input and output voltage of the high operating voltage load, and greatly improving the conversion of the power supply Efficiency, and directly provide a battery output voltage to the low working voltage load, avoid voltage up-down conversion, reduce power supply efficiency loss, and improve battery life. In addition, based on the voltage and current of the first battery and the second battery, the buck-boost module adjusts the power supply to the first load and the second load, so that the state of charge of the first battery and the second battery can be synchronized, avoiding the existence of batteries Overcharge or overdischarge, improve battery life.

As shown in FIG. 9, the embodiment of the present application also provides a power supply method, which is applied to the battery circuit described in any one of the above-mentioned embodiments in FIG. 1 to FIG. 8, and 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, when it is determined according to the collected voltage and current that the state of charge of the first battery is not synchronized with the state of charge of the second battery, adjust the power supply to the first load and the second load so that the charge of the first battery The state of charge is synchronized with the state of charge of the second battery.

Step 102 can be performed by the acquisition module of the battery circuit, and can achieve the same technical effect, so in order to avoid repetition, details are not repeated here.

In step 104, optionally, when the current is the current collected in the discharge state of the first battery and the second battery, adjust the power supply to the first load and the second load , comprising: according to the collected voltage of the first battery and the voltage of the second battery, determining whether the state of charge of the first battery is synchronized with the state of charge of the second battery; if not, according to the collected The voltage of the first battery, the voltage of the second battery, the first discharge current flowing through the first battery, and the second discharge current flowing through the second battery are determined to be supplied to the first The first supply current of the load and the second supply current provided to the second load; according to the first supply current, the second supply current, the available maximum capacity of the first battery and the second battery the available maximum capacity, adjust the magnitude of the second current flowing through the second terminal of the buck-boost module to adjust the power supply to the first load and the second load, until the state of charge of the first battery is equal to The states of charge of the second batteries are synchronized.

In step 104, optionally, in the case that the current is the current collected in the charging state of the first battery and the second battery, adjust the power supply to the first load and the second load , comprising: according to the collected voltage of the first battery and the voltage of the second battery, determining whether the state of charge of the first battery is synchronized with the state of charge of the second battery; if not, according to the collected The voltage of the first battery, the voltage of the second battery, the first charging current flowing through the first battery, and the second charging current flowing through the second battery are determined to be provided to the second The third power supply current of the load; 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, adjust the voltage flowing through the buck-boost The magnitude of the second current at the second terminal of the module is used to adjust the power supply to the first load and the second load until the state of charge of the first battery is synchronized with the state of charge of the second battery.

The steps in step 104 can be executed correspondingly by the control module of the battery circuit and the buck-boost module, and can achieve the same technical effect. To avoid repetition, details are not repeated here.

In addition, an embodiment of the present application also provides an electronic device, including the battery circuit as described in any one of the embodiments in FIG. 1 to FIG. 8 above.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, 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.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , optical disc), including several instructions to enable a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this 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.