CN116865406A

CN116865406A - Charging and discharging circuit, control method and electronic equipment

Info

Publication number: CN116865406A
Application number: CN202311095022.6A
Authority: CN
Inventors: 邓旭同
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2023-10-10
Anticipated expiration: 2043-08-29
Also published as: CN116865406B

Abstract

The application discloses a charge and discharge circuit, a control method and electronic equipment, relates to the field of battery management, and is used for solving the problem of unbalanced charge and discharge of each battery in a battery pack at low cost. The circuit comprises: the device comprises a processor, a first battery and a second battery which are connected in parallel. The processor is coupled to the first battery protection module of the first battery, and is used for adjusting the impedance of the first battery protection module according to the voltage of the first battery and the voltage of the second battery in the charge-discharge process of the first battery and the second battery; or the processor is coupled to the second battery protection module of the second battery, and is used for adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery; alternatively, the processor is coupled to the first battery protection module and the second battery protection module, and the processor is configured to adjust an impedance of the first battery protection module and/or an impedance of the second battery protection module according to a voltage of the first battery, a voltage of the second battery, and/or the like.

Description

Charging and discharging circuit, control method and electronic equipment

Technical Field

The embodiment of the application relates to the field of battery management, in particular to a charge and discharge circuit, a control method and electronic equipment.

Background

Currently, in order to achieve rapid charging of electronic devices, the electronic devices are generally powered by a battery pack including a plurality of batteries. For example, a battery pack may include a plurality of batteries connected in parallel. Because the capacities of the batteries may be different, a larger voltage difference may exist in each battery, so that the charging and discharging of each battery are unbalanced, the safety of the battery is affected, and finally the reliability of the battery pack is reduced.

For this reason, an additional battery balancing module is generally required in the electronic device to limit the charging current and the discharging current of the battery, so that the voltage of each battery is within a preset range, thereby balancing the charging and discharging of each battery. However, this increases the cost of the electronic device.

Disclosure of Invention

The application provides a charge and discharge circuit, a control method and electronic equipment, which are used for solving the problem of unbalanced charge and discharge of each battery in a battery pack at low cost.

In order to achieve the above purpose, the application adopts the following technical scheme:

in a first aspect, the present application provides a charge-discharge circuit comprising: the device comprises a processor, a first battery and a second battery, and the first battery and the second battery are connected in parallel. The first battery includes a first battery protection module and the second battery includes a second battery protection module. The connection mode of the processor and each battery protection module can comprise the following three conditions. In the first case, the processor is coupled to the first battery protection module. In this case, the processor may adjust the impedance of the first battery protection module according to the voltage of the first battery, the voltage of the second battery, during the charge or discharge of the first battery and the second battery. In a second case, the processor is coupled to a second battery protection module. In this case, the processor may adjust the impedance of the second battery protection module according to the voltage of the first battery, the voltage of the second battery during the charge or discharge of the first battery and the second battery. In a third case, the processor is coupled to the first battery protection module and the second battery protection module. In this case, the processor may adjust the impedance of the first battery protection module and the impedance of the second battery protection module according to the voltage of the first battery, the voltage of the second battery, during the charge or discharge of the first battery and the second battery.

In the charge-discharge circuit provided by the embodiment of the application, the processor adjusts the impedance of the battery protection module in one battery in the process of charging or discharging the battery, so as to adjust the charge current or the discharge current of the path where the battery is positioned, further directly adjust the voltage of the battery, and indirectly adjust the voltages of other batteries. Based on this, the purpose of charge equalization or discharge equalization of each battery can be achieved. Since the equalization module is not additionally added, the area of the charge-discharge circuit is reduced, and the cost of the electronic device is reduced. That is, the charge-discharge circuit provided by the embodiment of the application can solve the problem of unbalanced charge and unbalanced discharge of each battery in the battery pack at low cost.

In a possible implementation manner of the first aspect, each battery further includes a battery cell. Each battery protection module comprises M control units and M first impedance adjustment units connected in series, wherein the output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units. M is a positive integer. The positive electrode of the battery cell is coupled to the power supply end of each control unit, and the positive electrode of the battery cell or the negative electrode of the battery cell is coupled to the input ends of the M first impedance adjustment units. The control terminal of the at least one control unit is coupled to the processor. That is, the processor can adjust the impedance of at least one first impedance adjusting unit in the battery protection module through at least one control unit, so as to achieve the purpose of adjusting the impedance of the battery protection unit, thereby adjusting the current of the path where the battery is located and further adjusting the voltage of the battery.

In another possible implementation manner of the first aspect, the charge and discharge circuit provided by the present application further includes N voltage divider circuits, N is a positive integer, and N is less than or equal to M. Each voltage divider subcircuit is coupled to the processor. The N voltage dividing subcircuits are respectively coupled to N control units in the M control units. The positive electrode of the battery core is coupled to the control ends of the N impedance adjusting units through N voltage dividing sub-circuits and N control units. The positive electrode of the battery cell is also coupled to the control ends of the (M-N) first impedance adjusting units through the (M-N) control units. The (M-N) control units are control units other than the above-mentioned N control units, and the (M-N) first impedance adjustment units are first impedance adjustment units other than the above-mentioned N first impedance adjustment units.

When the processor cannot directly adjust the impedance of the first impedance adjusting unit through the control unit, the charge and discharge circuit can further comprise a voltage divider circuit. Therefore, the processor can control the voltage divider circuit to enable the voltage divider circuit and the control unit to cooperatively adjust the impedance of the first impedance adjusting unit, so that the aim of adjusting the impedance of the battery protection module is fulfilled.

In another possible implementation manner of the first aspect, a control terminal of each voltage divider circuit is coupled to the processor, and a power supply terminal of each voltage divider circuit is coupled to an anode of the battery cell. The output ends of the N voltage dividing sub-circuits are respectively coupled to the power supply ends of the N control units. The power supply terminals of the other (M-N) control units except the N voltage dividing sub-circuits are directly coupled to the positive electrode of the battery cell. The output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units.

That is, the power supply terminal of one part of the control units may be directly coupled to the positive electrode of the battery cell, and the power supply terminal of the other part of the control units may be respectively coupled to the positive electrode of the battery cell through the voltage divider circuit. Based on this, the processor adjusts the supply voltage provided by the voltage divider sub-circuit to the portion of the control unit coupled thereto by sending control information to the voltage divider sub-circuit. Since the output voltage of the control unit (i.e. the voltage of the control terminal of the impedance adjusting unit) is equal to the power supply voltage of the control unit, adjusting the power supply voltage of the portion of the control unit is equivalent to adjusting the voltage of the control terminal of the portion of the first impedance adjusting unit, thereby adjusting the impedance of the portion of the first impedance adjusting unit and further adjusting the impedance of the battery protection module.

In another possible implementation manner of the first aspect, the power supply terminal of each control unit is coupled to the positive electrode of the battery cell, and the output terminals of the N control units are respectively coupled to the power supply terminals of the N voltage divider circuits. The output ends of the N voltage dividing sub-circuits are respectively coupled to the control ends of the N first impedance adjusting units. The control terminal of each voltage divider circuit is coupled to the processor. The output ends of the (M-N) control units are respectively and directly coupled to the control ends of the (M-N) first impedance adjusting units.

That is, the output terminals of the partial control units may be coupled to the control terminals of the partial first impedance adjusting units through the voltage divider circuits, respectively, and the output terminals of the other partial control units may be directly coupled to the control terminals of the other partial first impedance adjusting units. Based on this, the processor controls the voltage dividing sub-circuit to divide the output voltage of the control unit coupled thereto by transmitting the control information to the voltage dividing sub-circuit, and then supplies the voltage to the control terminal of the part of the first impedance adjusting unit coupled thereto. That is, the voltage divider sub-circuit may adjust the voltage of the control terminal of the portion of the first impedance adjusting unit coupled thereto, thereby adjusting the impedance of the portion of the first impedance adjusting unit, and thus, the impedance of the battery protection module.

In another possible implementation manner of the first aspect, each battery further includes a battery cell. Each battery protection module comprises M control units, M first impedance adjusting units connected in series and M second impedance adjusting units connected in series. The output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units and the control ends of the M second impedance adjustment units, and the control end of at least one control unit is coupled to the processor. The positive electrode of the battery core is coupled to the power supply end of each control unit and the input ends of the M first impedance adjusting units. The negative electrode of the battery cell is coupled to the input ends of the M second impedance adjusting units.

That is, the processor may adjust the impedance of at least one first impedance adjusting unit and/or the impedance of at least one second impedance adjusting unit in the battery protection module through the control unit, so as to achieve the purpose of adjusting the impedance of the battery protection unit, thereby adjusting the current of the path where the battery is located, and further adjusting the voltage of the battery.

In another possible implementation manner of the first aspect, the charge and discharge circuit further includes N voltage dividing sub-circuits. Each voltage divider sub-circuit is coupled to the processor, and the N voltage divider sub-circuits are respectively coupled to N control units of the M control units. The positive electrode of the battery core is coupled to the control ends of the N first impedance adjusting units and the control ends of the N second impedance adjusting units through N voltage dividing sub-circuits and N control units. The positive electrode of the battery cell is also directly coupled to the control ends of the (M-N) first impedance adjusting units and the control ends of the (M-N) second impedance adjusting units through the (M-N) control units. Wherein the (M-N) control units are control units other than the above-mentioned N control units among the M control units. The (M-N) first impedance adjusting units are first impedance adjusting units other than the N first impedance adjusting units among the M first impedance adjusting units. The (M-N) second impedance adjusting units are second impedance adjusting units other than the N second impedance adjusting units among the M second impedance adjusting units.

When the processor cannot directly adjust the impedance of the first impedance adjusting unit through the control unit and/or the impedance of the second impedance adjusting unit, the charge-discharge circuit can further comprise a voltage divider circuit. In this way, the processor can control the voltage divider circuit to enable the voltage divider circuit to be matched with the control unit to adjust the impedance of the first impedance adjusting unit and/or adjust the impedance of the second impedance adjusting unit, so that the aim of adjusting the impedance of the battery protection module is fulfilled.

In another possible implementation manner of the first aspect, the control terminal of each voltage divider circuit is coupled to the processor, the power supply terminal of each voltage divider circuit is coupled to the positive electrode of the battery cell, and the output terminals of the N voltage divider circuits are respectively coupled to the power supply terminals of the N control units. The power supply terminals of the other (M-N) control units except the N voltage dividing sub-circuits are directly coupled to the positive electrode of the battery cell. The output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units, and the output ends of the M control units are also respectively coupled to the control ends of the M second impedance adjustment units.

That is, the power supply terminal of one part of the control units may be directly coupled to the positive electrode of the battery cell, and the power supply terminal of the other part of the control units may be respectively coupled to the positive electrode of the battery cell through the voltage divider circuit. Based on this, the processor adjusts the supply voltage provided by the voltage divider sub-circuit to the portion of the control unit coupled thereto by sending control information to the voltage divider sub-circuit. Since the output voltage of the control unit (i.e., the voltage of the control terminal of the impedance adjusting unit) is equal to the power supply voltage of the control unit, adjusting the power supply voltage of the control unit corresponds to adjusting the voltage of the control terminal of the first impedance adjusting unit, thereby adjusting the impedance of the first impedance adjusting unit, and/or adjusting the voltage of the control terminal of the second impedance adjusting unit, thereby adjusting the impedance of the battery protection module.

In another possible implementation manner of the first aspect, the power supply terminal of each control unit is coupled to the positive electrode of the battery cell. The output ends of the N control units are respectively coupled to the power supply ends of the N voltage divider circuits. The control terminal of each voltage divider circuit is coupled to the processor. The output ends of the N voltage dividing sub-circuits are respectively coupled to the control ends of the N first impedance adjusting units, and the output ends of the N voltage dividing sub-circuits are also respectively coupled to the control ends of the N second impedance adjusting units. The output ends of the (M-N) control units are respectively coupled to the control ends of the (M-N) first impedance adjusting units, and the output ends of the (M-N) control units are also respectively coupled to the control ends of the (M-N) second impedance adjusting units.

That is, the output terminals of the partial control units may be coupled to the control terminals of the partial first impedance adjusting units and the control terminals of the partial second impedance adjusting units, respectively, through the voltage divider circuit; the output of the further part of the control unit may be directly coupled to the control terminal of the further part of the first impedance adjustment unit and to the control terminal of the further part of the second impedance adjustment unit. Based on this, the processor controls the voltage dividing sub-circuit to divide the output voltage of the partial control unit coupled thereto by transmitting the control information to the voltage dividing sub-circuit, and then supplies the voltage to the control terminal of the partial first impedance adjusting unit and the control terminal of the partial second impedance adjusting unit coupled thereto. That is, the voltage dividing sub-circuit may adjust the voltage of the control terminal of the portion of the first impedance adjusting unit coupled thereto, thereby adjusting the impedance of the portion of the first impedance adjusting unit. And/or the voltage dividing sub-circuit can adjust the voltage of the control end of the part of the second impedance adjusting unit coupled with the voltage dividing sub-circuit, so as to adjust the impedance of the part of the second impedance adjusting unit and further adjust the impedance of the battery protection module.

In another possible implementation manner of the first aspect, the N voltage dividing subcircuits may be located outside the battery. Of course, the N voltage divider circuits may also be located in a battery protection module of the battery. Of course, part of the voltage dividing sub-circuits of the N voltage dividing sub-circuits may be located outside the battery, and another part of the voltage dividing sub-circuits may be located in a battery protection module of the battery. The application is not limited in this regard. The position of the voltage dividing sub-circuit does not affect the connection relation between the voltage dividing sub-circuit and other parts in the charge and discharge circuit.

In another possible implementation manner of the first aspect, the charging and discharging circuit is used for supplying power to the load circuit. Each of the impedance adjusting units includes a first switching element and a second switching element. The control terminal of the first switching element is coupled to the output terminal of the control unit, the first terminal of the first switching element is coupled to the positive electrode of the battery cell or the negative electrode of the battery cell, and the second terminal of the first switching element is coupled to the second terminal of the second switching element. The control terminal of the second switching element is coupled to the output terminal of the control unit, and the first terminal of the second switching element is configured to be coupled to the power supply terminal of the load circuit. That is, the processor adjusts the impedance of the impedance adjusting unit by adjusting the impedance of at least one switching element in each of the impedance adjusting units.

In a second aspect, the present application provides a charge-discharge circuit comprising: a processor, a first battery, and a second battery. The first battery and the second battery are connected in parallel. The first battery includes a first battery protection module and the second battery includes a second battery protection module. Wherein: the processor is coupled to the first battery protection module and the second battery protection module, and is used for adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery in the process of charging or discharging the first battery and the second battery.

In a third aspect, the present application provides a control method of a charge-discharge circuit. The control method may be applied to the first aspect and any possible implementation manner, or the charge-discharge circuit described in the second aspect. The control method may include: and adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery.

In a possible implementation manner of the third aspect, each battery protection module includes M control units and M first impedance adjustment units connected in series, where M is a positive integer. The adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes: and sending control information to at least one control unit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the control unit to adjust the impedance of the first impedance adjusting unit coupled thereto.

In another possible implementation manner of the third aspect, the charge-discharge circuit further includes N voltage divider circuits, N is a positive integer, and N is less than or equal to M. The adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes: and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the impedance of the first impedance adjusting unit coupled with the voltage divider circuit.

In another possible implementation manner of the third aspect, the N voltage divider circuits are respectively located between the positive electrode of the battery cell and the power supply terminals of the N control units. And the control information is sent to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the impedance of a first impedance adjusting unit coupled with the voltage divider circuit, and comprises: and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the input voltage of the control unit coupled thereto so as to adjust the impedance of the first impedance adjusting unit coupled thereto.

In another possible implementation manner of the third aspect, the N voltage dividing subcircuits are respectively located between the output ends of the N control units and the control ends of the N first impedance adjusting units. And the control information is sent to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the impedance of a first impedance adjusting unit coupled with the voltage divider circuit, and comprises: and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the output voltage of the voltage divider circuit so as to adjust the impedance of the first impedance adjusting unit coupled with the voltage divider circuit.

In another possible implementation manner of the third aspect, each battery protection module includes M control units, M first impedance adjustment units connected in series, and M second impedance adjustment units connected in series. The adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes: and sending control information to at least one control unit according to the voltage of the first battery and the voltage of the second battery. The control information is used for indicating the voltage divider circuit to adjust the impedance of the first impedance adjusting unit coupled with the voltage divider circuit and/or is used for indicating the voltage divider circuit to adjust the impedance of the second impedance adjusting unit coupled with the voltage divider circuit.

In another possible implementation manner of the third aspect, the charge and discharge circuit further includes N voltage dividing subcircuits. The adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes: and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the output voltage of the voltage divider circuit so as to adjust the impedance of the first impedance adjusting unit coupled with the voltage divider circuit and/or adjust the impedance of the second impedance adjusting unit.

In another possible implementation manner of the third aspect, the N voltage divider circuits are respectively located between the positive electrode of the battery cell and the power supply terminals of the N control units. And the control information is sent to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the impedance of a first impedance adjustment unit coupled thereto, and/or the control information is used for instructing the voltage divider circuit to adjust the impedance of a second impedance adjustment unit coupled thereto, and comprises: and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the input voltage of the control unit coupled thereto to adjust the impedance of the first impedance adjustment unit coupled thereto and/or to adjust the impedance of the second impedance adjustment unit coupled thereto.

In another possible implementation manner of the third aspect, the N voltage dividing subcircuits are respectively located between the output ends of the N control units and the control ends of the N first impedance adjusting units. And the control information is sent to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the impedance of a first impedance adjustment unit coupled thereto, and/or the control information is used for instructing the voltage divider circuit to adjust the impedance of a second impedance adjustment unit coupled thereto, and comprises: and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information is used for instructing the voltage divider circuit to adjust the output voltage of the voltage divider circuit so as to adjust the impedance of the first impedance adjusting unit coupled with the voltage divider circuit. And/or adjusting the impedance of the second impedance adjusting unit coupled thereto.

In another possible implementation manner of the third aspect, each of the above-mentioned impedance adjusting units includes a first switching element and a second switching element. The adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes: according to the voltage of the first battery and the voltage of the second battery, control information is sent to at least one control unit, the control information is used for instructing the control unit to adjust the impedance of the first switching element and/or the control information is used for instructing the control unit to adjust the impedance of the second switching element;

Or alternatively, the process may be performed,

and sending control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery, wherein the control information is used for instructing the voltage dividing sub-circuit to adjust the impedance of the first switching element and/or the control information is used for instructing the voltage dividing sub-circuit to adjust the impedance of the second switching element.

In another possible implementation manner of the third aspect, during the charging process, adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes:

when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold, increasing the impedance of the first battery protection module and/or decreasing the impedance of the second battery protection module;

and/or the number of the groups of groups,

when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, increasing the impedance of the second battery protection module and/or decreasing the impedance of the first battery protection module.

In another possible implementation manner of the third aspect, during the discharging, adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery includes:

When the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than a target threshold, increasing the impedance of the second battery protection module and/or decreasing the impedance of the first battery protection module;

and/or the number of the groups of groups,

when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, increasing the impedance of the first battery protection module and/or decreasing the impedance of the second battery protection module.

In a fourth aspect, the present application provides an electronic device, which includes a load circuit, and a charge-discharge circuit according to the first aspect and any possible implementation manner thereof, or a charge-discharge circuit according to the second aspect. The charge-discharge circuit also comprises a power management module. The power management module is coupled to the first battery protection module, the second battery protection module, the processor, and the load circuit of the charge-discharge circuit. The processor is also coupled to the load circuit.

In a fifth aspect, the application provides a computer readable storage medium comprising instructions which, when run on an electronic device, cause the electronic device to perform the method of the third aspect and any one of its possible implementations.

In a sixth aspect, the application provides a computer program product comprising instructions which, when run on an electronic device as described above, cause the electronic device to perform the method according to the third aspect and any one of its possible implementations.

In a seventh aspect, a chip system is provided, the chip system comprising a processor for supporting an electronic device to implement the functions referred to in the first aspect above. In one possible design, the electronic device may further include interface circuitry that may be used to receive signals from other devices (e.g., memory) or to send signals to other devices (e.g., a communication interface). The system-on-chip may include a chip, and may also include other discrete devices.

The technical effects of the second to seventh aspects are referred to the technical effects of the first aspect and any of its embodiments and are not repeated here.

Drawings

FIG. 1 is a schematic diagram of an electronic device in the prior art;

fig. 2 is a schematic circuit diagram of an electronic device in the prior art;

FIG. 3 is a schematic circuit diagram of another electronic device according to the prior art;

fig. 4 is a schematic circuit diagram of an electronic device according to an embodiment of the present application;

FIG. 5 is a second schematic circuit diagram of an electronic device according to an embodiment of the present application;

FIG. 6 is a third schematic diagram of a circuit structure of an electronic device according to an embodiment of the present application;

fig. 7 is a schematic flow chart of a control method of a charge-discharge circuit according to an embodiment of the present application;

fig. 8 is a schematic circuit diagram of a battery according to an embodiment of the present application;

FIG. 9 is a second schematic diagram of a circuit structure of a battery according to an embodiment of the present application;

FIG. 10 is a third schematic diagram of a battery circuit according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a circuit structure of a battery according to an embodiment of the present application;

FIG. 12 is a schematic diagram of a battery circuit according to an embodiment of the present application;

fig. 13 is a schematic diagram of connection between a processor and a battery in an electronic device according to an embodiment of the present application;

FIG. 14 is a second schematic diagram of a connection relationship between a processor and a battery in an electronic device according to an embodiment of the present application;

FIG. 15 is a third schematic diagram illustrating a connection relationship between a processor and a battery in an electronic device according to an embodiment of the present application;

FIG. 16 is a schematic diagram of a battery circuit according to an embodiment of the present application;

FIG. 17 is a schematic diagram of a battery circuit according to an embodiment of the present application;

FIG. 18 is a schematic diagram of a battery circuit according to an embodiment of the present application;

FIG. 19 is a diagram illustrating a circuit structure of a battery according to an embodiment of the present application;

FIG. 20 is a schematic diagram of a circuit structure of a battery according to an embodiment of the present application;

FIG. 21 is a schematic diagram of a voltage divider circuit according to an embodiment of the present application;

fig. 22 is a second schematic circuit diagram of a voltage divider circuit according to an embodiment of the present application.

Detailed Description

Some concepts to which the present application relates will be described first.

The terms "first," "second," and the like, in accordance with embodiments of the present application, are used solely for the purpose of distinguishing between similar features and not necessarily for the purpose of indicating a relative importance, number, sequence, or the like.

The terms "exemplary" or "such as" and the like, as used in relation to embodiments of the present application, are used to denote examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The terms "coupled" and "connected" in accordance with embodiments of the application are to be construed broadly, and may refer, for example, to a physical direct connection, or to an indirect connection via electronic devices, such as, for example, electrical resistance, inductance, capacitance, or other electrical devices.

In order to improve the endurance, the charging efficiency, and the like, some electronic devices (such as a folding screen mobile phone folded left and right as shown in a in fig. 1, or a folding screen mobile phone folded up and down as shown in C in fig. 1) may be powered by a battery pack. The battery pack may include a plurality of batteries connected in parallel with each other. However, there may be a difference in the capacities of the respective batteries connected in parallel in the battery pack, which may cause the pressure difference between the respective batteries to exceed a target threshold (e.g., 0.1V) during the charge or discharge process, thereby causing the charge imbalance or discharge imbalance of the respective batteries, affecting the safety of the batteries in the battery pack, and eventually causing the reliability of the battery pack to be lowered.

Illustratively, as shown in B of fig. 1, the left-right folded screen phone 10 includes a first main board 110, a first sub-board 120, and a first flexible circuit board 130, the first flexible circuit board 130 connecting the first main board 110 and the first sub-board 120. The first motherboard 110 includes a battery a (with a capacity of 1900 AH), a first host processor 111, and a first universal serial bus (universal serial bus, USB) interface 112, a data terminal of the first USB interface 112 is coupled to the first host processor 111, and a power terminal of the first USB interface 112 is coupled to the battery a. The first sub-board 120 includes a battery B (capacity 2400 AH) and a first sub-processor 121. Battery a and battery B are connected in parallel and the first master processor 111 is coupled to the first slave processor 121. When the folding screen mobile phone 10 folded left and right is charged, the USB interface of the charger is coupled to the USB interface of the folding screen mobile phone 10 folded left and right, and the power supply end of the charger is coupled to an external power supply.

Illustratively, as shown at C in fig. 1, the folding screen handset 20 folded up and down includes a second main board 140, a second sub-board 150, and a second flexible circuit board 160, the second flexible circuit board 160 connecting the second main board 140 and the second sub-board 150. The second motherboard 140 includes a battery D (with a capacity of 1900 AH), a second host processor 142, and a second universal serial bus (universal serial bus, USB) interface 141, a data terminal of the second USB interface 141 is coupled to the second host processor 142, and a power terminal of the second USB interface 141 is coupled to the battery D. The second sub board 150 includes a battery C (capacity 2400 AH) and a second sub processor 151. Battery C and battery D are connected in parallel, and the second master processor 142 is coupled to the second slave processor 151. When the folding screen mobile phone 20 folded up and down is charged, the USB interface of the charger is coupled to the USB interface of the folding screen mobile phone 20 folded up and down, and the power supply end of the charger is coupled to an external power supply.

The capacity (1900 AH) of battery a (or battery D) is smaller than the capacity (2400 AH) of battery B (or battery C), which may cause the pressure difference between battery a and battery B (or the pressure difference between battery D and battery C) to exceed a target threshold during charging or discharging of the folding screen phone 10 (or folding screen phone 20), thereby causing the charge imbalance or discharge imbalance of battery a and battery B (or battery C and battery D) (e.g., battery a (or battery D) is overdischarged or battery B (or battery C) is overcharged), thereby causing the life of battery a (or battery D), battery B (or battery C) to be shortened. If either of the battery a, the battery B (or the battery C, the battery D) is damaged or aged, the problem of the imbalance in the capacities of the battery a and the battery B (or the battery C and the battery D) is more serious, thereby exacerbating the life span degradation and capacity degradation of the battery a, the battery B (or the battery C, the battery D).

In general, in order to balance charge and discharge of the batteries in the battery pack, an equalization circuit (or equalization module) is additionally added to the electronic device to limit the charge current or the discharge current of the batteries, so that the voltage difference of each battery in the battery pack is smaller than a target threshold value, and thus charge or discharge of each battery is balanced.

It should be noted that, the parallel batteries in the battery pack may be referred to herein as a first battery and a second battery, respectively. The first battery and the second battery are different batteries, but it is not indicated that only two batteries connected in parallel are included in the battery pack. For convenience of description, the following description will be given by taking an example in which the first battery and the second battery are two batteries connected in parallel.

Fig. 2 shows a schematic circuit configuration of an electronic device according to the prior art. As shown in fig. 2, the electronic device may include: a charge-discharge circuit 210 and a load circuit 220. The charge/discharge circuit 210 includes: a power management module 211, a first battery 212, a second battery 213, a first equalization module 214, a second equalization module 215, a first monitoring module 216, a second monitoring module 217, and a processor 218. The power management module 211 is coupled to the first battery 212, the second battery 213, the load circuit 220, and the processor 218. First battery 212 is connected in series with first equalization module 214, and first battery 212 is connected in parallel with first monitoring module 216. The second battery 213 is connected in series with the second equalization module 215, and the second battery 213 is connected in parallel with the second monitoring module 217. Processor 218 is also coupled to first equalization module 214, second equalization module 215, first monitoring module 216, second monitoring module 217, and load circuit 220.

In connection with B in fig. 1 and fig. 2, the power management module 211 may be coupled to an external power source through a charger (not shown in both B in fig. 2 and fig. 1) during charging of the first battery 212 (corresponding to battery a or battery D) and the second battery 213 (corresponding to battery B or battery C). Thus, in one aspect, the power management module 211 may receive a charging input from a charger to charge the first battery 212 and the second battery 213; on the other hand, the power management module 211 may receive charging input from a charger to power the load circuit 220, the processor 218.

During discharge of the first battery 212 and the second battery 213, the power management module 211 may receive discharge inputs from the first battery 212, the second battery 213, and power the processor 218 and the load circuit 220.

In the above process, the first monitoring module 216 monitors the voltage of the first battery 212 and sends it to the processor 218. The second monitoring module 217 monitors the voltage of the second battery 213 and sends to the processor 218. The processor 218 may adjust the impedance of the first balancing module 214 located on the path of the first battery 212 according to the voltage of the first battery 212 and the voltage of the second battery 213, so as to directly adjust the charge/discharge current on the path of the first battery 212, and further adjust the voltage of the first battery 212. Since the charge and discharge current of the electronic device is unchanged, and the charge and discharge current of the electronic device is the sum of the charge and discharge current of the path of the first battery 212 and the charge and discharge current of the path of the second battery 213, after the charge and discharge current of the path of the first battery 212 is adjusted, the charge and discharge current of the path of the second battery 213 is correspondingly adjusted, and therefore, the voltage of the second battery 213 is correspondingly adjusted.

In another embodiment, the processor 218 may also adjust the impedance of the second equalization module 215 located on the path of the second battery 213, thereby adjusting the charge-discharge current on the path of the second battery 213 and thus adjusting the voltage of the second battery 213. In this way, the processor 218 can indirectly adjust the charge-discharge current on the path of the first battery 212, and thus adjust the voltage of the first battery 212.

In another embodiment, the processor 218 may adjust the impedance of the first balancing module 214 located on the path of the first battery 212, thereby adjusting the charge-discharge current of the path of the first battery 212, thereby adjusting the voltage of the first battery 212, and adjust the impedance of the second balancing module 215 located on the path of the second battery 213, thereby adjusting the charge-discharge current of the path of the second battery 213, thereby adjusting the voltage of the second battery 213.

Based on the above circuit structure and the adjustment process, the voltage difference between the voltage of the first battery 212 and the voltage of the second battery 213 is smaller than the target threshold (e.g. 0.1V), so as to finally ensure charge-discharge balance of each battery, and improve the reliability of the battery pack including the first battery 212 and the second battery 213.

However, the electronic device needs to additionally include two equalization modules, which not only increases the area of the charge-discharge circuit, but also increases the cost of the electronic device.

The equalization module may be an integrated equalization chip, or an equalization circuit built by a separate electronic component (such as a field effect transistor), but is not limited thereto.

In order to reduce the cost of the electronic device and to equalize the charge and discharge of the individual batteries in the electronic device, another electronic device is provided in one possible modification. Specifically, only an equalization module is arranged on the path where one battery is located. Based on this, the processor adjusts the impedance of the equalization module according to the voltage of each battery. Therefore, the charge and discharge balance of each battery can be ensured, and the reliability of the battery pack is improved.

By way of example, as shown in fig. 3, one possible modification to the electronic device provided may include: a modified charge-discharge circuit 210, and a load circuit 220. Wherein, the improved charge-discharge circuit 210 comprises: the power management module 211, the first battery 212, the second battery 213, the third equalization module 310, the first monitoring module 216, the second monitoring module 217, and the processor 218. The power management module 211 is coupled to the first battery 212, the second battery 213, the load circuit 220, and the processor 218. The first battery 212 is connected in series with the third equalization module 310, and the first battery 212 is connected in parallel with the first monitoring module 216. The second battery 213 is connected in parallel with the second monitoring module 217. The processor 218 is coupled to the third equalization module 310, the first monitoring module 216, the second monitoring module 217, and the load circuit 220.

In the process of charging and discharging the first battery 212 and the second battery 213, the processor 218 directly adjusts the charging and discharging current of the path where the first battery 212 is located according to the voltage of the first battery 212 and the voltage of the second battery 213, so as to adjust the voltage of the first battery 212, and indirectly adjust the charging and discharging current of the path where the second battery 213 is located, so that the voltage of the second battery 213 is correspondingly adjusted, and the voltage difference between the voltage of the first battery 212 and the voltage of the second battery 213 is smaller than the target threshold value, so as to finally ensure that the charging and discharging balance of each battery.

However, in the electronic device provided by this possible improvement, an additional equalization module is still required. In this way, the area of the charge-discharge circuit is still increased, and the cost of the electronic device is increased.

In summary, in the prior art, in order to ensure charge-discharge equalization of each battery in the electronic device, at least one equalization module needs to be additionally added in the electronic device, so that the area of the charge-discharge circuit is increased, and the cost of the electronic device is increased.

Therefore, the embodiment of the application provides the electronic equipment, and the impedance of the battery protection module in the battery is adjusted to adjust the charging current or the discharging current of the path of each battery, so that the pressure difference between the batteries is smaller than the target threshold value, and the charge balance or the discharge balance of each battery is finally ensured. That is, in the electronic device in the embodiment of the application, the battery protection module is multiplexed without adding an additional equalization module, so that the charge equalization or the discharge equalization of each battery is realized, and therefore, the area of a charge-discharge circuit is not increased, and the cost of the electronic device is not increased.

The electronic device according to the embodiment of the application can be mobile or fixed. The electronic device may be deployed on land (e.g., indoor or outdoor, hand-held or vehicle-mounted, etc.), on water (e.g., ship model), or in the air (e.g., drone, etc.). The electronic device may be referred to as a User Equipment (UE), an access terminal, a terminal unit, a subscriber unit (subscriber unit), a terminal station, a Mobile Station (MS), a mobile station, a terminal agent, a terminal apparatus, or the like. For example, the electronic device may be a cell phone, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a terminal in industrial control (industrial control), a terminal in unmanned (self driving), a terminal in remote medical (remote medical), a terminal in smart grid (smart grid), a terminal in transportation security (transportation safety), a terminal in smart city, a terminal in smart home (smart home), and the like. The embodiment of the application is not limited to the specific type, structure and the like of the electronic equipment.

As shown in fig. 4, an electronic device provided by an embodiment of the present application may include: a further improved charge-discharge circuit 210, and a load circuit 220. The further improved charge-discharge circuit 210 includes: a power management module 211, a first battery 212, a second battery 213, a first monitoring module 216, a second monitoring module 217, and a processor 218. Wherein the first battery 212 may include: a first cell 410 and a first battery protection module 420, the first cell 410 coupled to the first battery protection module 420; the second battery 213 may include: the second battery cell 430, the second battery protection module 440, the second battery cell 430 is coupled to the second battery protection module 440. The power management module 211 is coupled to the first battery protection module 420, the second battery protection module 440, the load circuit 220, and the processor 218. The first monitoring module 216 is connected in parallel with the first battery 212. The second monitoring module 217 is connected in parallel with the second battery 213. The processor 218 is also coupled to the first monitoring module 216, the second monitoring module 217, the first battery protection module 420, and the load circuit 220.

Alternatively, as shown in fig. 5 in conjunction with fig. 4, the processor 218 is coupled to the second battery protection module 440, but the processor 218 is not coupled to the first battery protection module 420.

Alternatively, as shown in fig. 6 in conjunction with fig. 4, the processor 218 may be coupled to both the first battery protection module 420 and the second battery protection module 440.

The first monitoring module, the second monitoring module, the first battery and the second battery according to the embodiments of the present application may be independent modules (as shown in fig. 4 to 6). In other embodiments, the first monitoring module may be integrated in a first battery and the second monitoring module may be integrated in a second battery. Each monitoring module is used for monitoring the corresponding electric quantity information such as the voltage of the battery, the battery capacity, the current of the path where the battery is located and the like. The first monitoring module and the second monitoring module may be fuel gauges, but are not limited thereto.

The load circuit related to the embodiment of the application can comprise a display screen, keys, a mobile communication module, a wireless communication module, a sensor module and the like.

The processor to which embodiments of the present application relate may be a system-on-chip (SoC) in an electronic device. For example, a first master processor 111 and a first slave processor 121 shown in B in fig. 1.

In an embodiment of the present application, the processor may be coupled to each battery protection module through a board-to-board (BTB) connector.

The processor 218 may be configured to execute the method for controlling the charge/discharge circuit provided in the embodiment of the present application during the charge or discharge process of the first battery 212 and the second battery 213. As shown in fig. 7, the control method may include:

s701, the processor acquires the voltage of the first battery and the voltage of the second battery.

The processor may obtain the voltage of each battery separately from a monitoring module for monitoring each battery. The following description is made in terms of possible configurations of the individual monitoring modules.

In one embodiment, as shown in fig. 4-6, the first monitoring module 216 is a separate module from the first battery 212, and the first monitoring module 216 is connected in parallel with the first battery 212; the second monitoring module 217 and the second battery 213 are independent modules, and the second monitoring module 217 is connected in parallel with the second battery 213. During charging or discharging of the first battery 212 and the second battery 213, the first monitoring module 216 may monitor the voltage of the first battery 212 and send to the processor 218. The second monitoring module 217 may monitor the voltage of the second battery 213 and send to the processor 218.

In another embodiment, as shown at a in fig. 8, the monitoring module 810 may be integrated inside the battery protection module 800. In particular, the battery protection module 800 may include a monitoring module 810, a control unit 820, and a first impedance adjustment unit 830, an output terminal of the control unit 820 being coupled to a control terminal of the first impedance adjustment unit 830. The positive pole of the battery 840 is coupled to the power supply terminal of the control unit 820, the first terminal of the power management module. The negative pole of the battery cell 840 is coupled to the second terminal of the power management module through the first impedance adjusting unit 830. The processor 218 is coupled to a control terminal of the control unit 820, and the monitoring module 810. The monitoring module 810 is connected in parallel with the battery cells 840. The monitoring module 810 may monitor the voltage of the battery cells 840 and send to the processor 218. The voltage of the battery is substantially equal to the voltage of the cell. Thus, the monitoring module 810 monitors the voltage of the battery cells 840, which is equivalent to monitoring the voltage of the battery.

In another embodiment, as shown at B in fig. 8, the monitoring module is integrated inside the control unit 820. That is, the control unit 820 also has a function of monitoring the voltage of the battery cell 840. At this time, the control unit 820 is also coupled to the negative electrode of the battery cell 840. Other connection relationships are not described in detail herein.

S702, the processor adjusts the impedance of the first battery protection module and/or adjusts the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery.

Specifically, the processor may adjust the impedance of the first battery protection module and/or adjust the impedance of the second battery protection module according to the connection relationship between the processor and the first battery protection module and the second battery protection module. The following is a description of the case.

In one embodiment, as shown in fig. 4, the processor 218 is coupled to a first battery protection module 420. The processor 218 may adjust the impedance of the first battery protection module 420 according to the voltage of the first battery 212 and the voltage of the second battery 213, thereby adjusting the charging current or the discharging current of the path of the first battery 212, and further adjusting the voltage of the first battery 212. Meanwhile, since the charging current (or discharging current) of the electronic device is unchanged, the charging current (or discharging current) of the path where the first battery 212 is located is adjusted, and the charging current (or discharging current) of the path where the second battery 213 is located is also indirectly adjusted, so as to adjust the voltage of the second battery 213. Based on this, it is possible to ensure that the voltage difference between the first battery 212 and the second battery 213 is smaller than the target threshold value, thereby ensuring charge equalization (or discharge equalization) of the first battery 212 and the second battery 213, and without increasing the area of the charge-discharge circuit 210, and without increasing the cost of the electronic device.

For example, the processor may increase the impedance of the first battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold during charging of the first battery and the second battery. Thus, the charging current of the passage where the first battery is located can be reduced, and the charging speed of the first battery can be reduced. Meanwhile, the charging current of the passage where the second battery is located can be indirectly increased, and the charging speed of the second battery is improved, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charging balance of the first battery and the second battery is ensured.

Similarly, when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, the processor may decrease the impedance of the first battery protection module. Thus, the charging current of the passage where the first battery is located can be increased, and the charging speed of the first battery can be improved. Meanwhile, the charging current of the passage where the second battery is located can be indirectly reduced, and the charging speed of the second battery is reduced, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charging balance of the first battery and the second battery is ensured.

For example, the processor may decrease the impedance of the first battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold during discharging of the first battery and the second battery. Thus, the discharging current of the passage where the first battery is positioned can be increased, and the discharging speed of the first battery can be improved. Meanwhile, the discharging current of the passage where the second battery is located can be indirectly reduced, and the discharging speed of the second battery is reduced, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charge balance of the first battery and the second battery is ensured.

Similarly, when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, the impedance of the first battery protection module is increased. Thus, the discharging current of the passage where the first battery is located can be reduced, and the discharging speed of the first battery can be reduced. Meanwhile, the discharging current of the passage where the second battery is located can be indirectly increased, and the discharging speed of the second battery is increased, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charge balance of the first battery and the second battery is ensured.

In another embodiment, as shown in fig. 5, the processor 218 is coupled to a second battery protection module 440. The processor 218 may adjust the impedance of the second battery protection module 440 according to the voltage of the first battery 212 and the voltage of the second battery 213, thereby adjusting the charging current (or discharging current) of the path of the second battery 213, and further adjusting the voltage of the second battery 213. Meanwhile, since the charging current (or discharging current) of the electronic device is unchanged, the charging current (or discharging current) of the path in which the second battery 213 is located is adjusted, and the charging current (or discharging current) of the path in which the first battery 212 is located is also indirectly adjusted, so as to adjust the voltage of the first battery 212. Based on this, it is possible to ensure that the voltage difference between the first battery 212 and the second battery 213 is smaller than the target threshold value, thereby ensuring charge equalization (or discharge equalization) of the first battery 212 and the second battery 213, and without increasing the area of the charge-discharge circuit 210, and without increasing the cost of the electronic device.

For example, the processor may decrease the impedance of the second battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold during charging of the first battery and the second battery. Thus, the charging current of the path where the second battery is located can be increased, and the charging speed of the second battery can be improved. Meanwhile, the charging current of the passage where the first battery is located can be indirectly reduced, and the charging speed of the first battery is reduced, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charging balance of the first battery and the second battery is ensured.

Similarly, the processor may increase the impedance of the second battery protection module when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold. Thus, the charging current of the path where the second battery is located can be reduced, and the charging speed of the second battery can be reduced. Meanwhile, the charging current of the passage where the first battery is located can be indirectly increased, and the charging speed of the first battery is improved, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charging balance of the first battery and the second battery is ensured.

For example, the processor may increase the impedance of the second battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold during discharging of the first battery and the second battery. Thus, the discharging current of the path where the second battery is located can be reduced, and the discharging speed of the second battery can be reduced. Meanwhile, the discharging current of the passage where the first battery is located can be indirectly increased, and the discharging speed of the first battery is increased, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charge balance of the first battery and the second battery is ensured.

Similarly, when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, the impedance of the second battery protection module is reduced. Thus, the discharging current of the passage where the second battery is positioned can be increased, and the discharging speed of the second battery can be improved. Meanwhile, the discharging current of the passage where the first battery is located can be indirectly reduced, and the discharging speed of the first battery is reduced, so that the pressure difference between the first battery and the second battery is smaller than a target threshold value, and the charge balance of the first battery and the second battery is ensured.

In another embodiment, as shown in fig. 6, the processor 218 is coupled to a first battery protection module 420 and a second battery protection module 440. The processor 218 may adjust the impedance of the first battery protection module 420 and/or the impedance of the second battery protection module 440 according to the voltage of the first battery 212 and the voltage of the second battery 213, so as to adjust the charging current (or discharging current) of the path in which the first battery 212 is located and the charging current (or discharging current) of the path in which the second battery 213 is located, and further adjust the voltage of the first battery 212 and the voltage of the second battery 213, so that the differential pressure between the first battery 212 and the second battery 213 is smaller than the target threshold value, and finally charge balance (or discharge balance) of the first battery 212 and the second battery 213. Thus, the area of the charge/discharge circuit 210 is not increased, and the cost of the electronic device is not increased.

For example, the processor may increase the impedance of the first battery protection module and/or decrease the impedance of the second battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold during charging of the first battery and the second battery. In this way, the pressure difference between the first battery and the second battery is smaller than the target threshold value, and the charge balance of the first battery and the second battery is ensured.

Similarly, when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, the processor may increase the impedance of the second battery protection module and/or decrease the impedance of the first battery protection module. In this way, the pressure difference between the first battery and the second battery is smaller than the target threshold value, and the charge balance of the first battery and the second battery is ensured. For the specific analysis process, reference may be made to the analysis process in the above two embodiments, and the description thereof will not be repeated here.

For example, the processor may increase the impedance of the second battery protection module and/or decrease the impedance of the first battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than the target threshold during discharging of the first battery and the second battery. In this way, the pressure difference between the first battery and the second battery is smaller than the target threshold value, and the charge balance of the first battery and the second battery is ensured.

Similarly, when the voltage of the second battery is greater than the voltage of the first battery and the difference between the voltage of the second battery and the voltage of the first battery is greater than the target threshold, the impedance of the first battery protection module is increased and/or the impedance of the second battery protection module is decreased. In this way, the pressure difference between the first battery and the second battery is smaller than the target threshold value, and the charge balance of the first battery and the second battery is ensured. For the specific analysis process, reference may be made to the analysis process in the above two embodiments, and the description thereof will not be repeated here.

In the following, a possible structure of each battery protection module 800 and the above step S702 are described in detail with reference to fig. 9-22, taking an example that the battery does not include the monitoring module, i.e., the monitoring module is independent from the battery.

Optionally, the battery protection module may include M control units 820 and M first impedance adjustment units connected in series, and output ends of the M control units are respectively coupled to control ends of the M first impedance adjustment units. M is a positive integer. That is, the control unit 820 and the first impedance adjusting unit 830 may have the same number, and may have at least one. The control unit 820 may be a protection chip.

In one embodiment, as shown in a of fig. 9, each of the battery protection modules 800 may include: a control unit 820 and a first impedance adjusting unit 830, the output of the control unit 820 being coupled to the control terminal of the first impedance adjusting unit 830. The positive pole of the battery 840 is coupled to the power supply terminal of the control unit 820, and to the first terminal of the power management module. The negative electrode of the battery cell 840 is coupled to the input terminal of the first impedance adjusting unit 830. An output terminal of the first impedance adjusting unit 830 is coupled to a second terminal of the power management module. A control terminal of the control unit 820 is coupled to the processor 218. During the charge or discharge of the first battery and the second battery, the processor 218 transmits control information to the control unit 820 according to the voltage of the first battery and the voltage of the second battery. The control information may instruct the control unit 820 to adjust the impedance of the first impedance adjusting unit 830.

Note that, the first impedance adjusting unit 830 may be coupled to the positive electrode of the battery cell (as shown by a in fig. 9) or may be coupled to the negative electrode of the battery cell (as shown by B in fig. 9).

As shown in B in fig. 9, the positive electrode of the battery cell 840 is coupled to the first terminal of the power management module through the first impedance adjusting unit 830, and the positive electrode of the battery cell 840 is also coupled to the power supply terminal of the control unit 820. The negative pole of the cell 840 is directly coupled to the second terminal of the power management module. An output of the control unit 820 is coupled to a control terminal of the first impedance adjusting unit 830, and a control terminal of the control unit 820 is coupled to the processor 218.

In another embodiment, as shown in a of fig. 10, in order to enhance the protection capability of the battery cell in the battery, each of the battery protection modules 800 may include: a plurality of control units 820 and a plurality of first impedance adjusting units 830, wherein the output ends of the plurality of control units 820 are respectively coupled to the control ends of the plurality of first impedance adjusting units 830. The positive pole of the battery cell 840 is coupled to the power supply terminal of each control unit 820, and to the first terminal of the power management module. The negative electrode of the battery cell 840 is coupled to a first terminal of the power management module through a plurality of first impedance adjusting units 830 connected in series. A control terminal of each control unit 820 is coupled to the processor 218. During the charge or discharge of the first battery and the second battery, the processor 218 sends control information to the at least one control unit 820 based on the voltage of the first battery, the voltage of the second battery. The control information may instruct the control unit 820 to adjust the impedance of the first impedance adjustment unit 830 coupled to the control unit 820.

It should be noted that, in the embodiment of the present application, a control end of at least one control unit 820 is coupled to the processor 218. A control terminal of each control unit 820 is shown in fig. 10 as coupled to the processor 218. The input ends of the plurality of first impedance adjusting units 830 connected in series may be coupled to the positive electrode of the battery cell (as shown in a in fig. 10) or may be coupled to the negative electrode of the battery cell (as shown in B in fig. 10), and the specific connection relationship may refer to the circuit connection relationship in B in fig. 9.

Optionally, the battery protection module provided in the embodiment of the present application may further include M second impedance adjustment units connected in series, in addition to the M control units 820 and the M first impedance adjustment units connected in series. The output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units and the control ends of the M second impedance adjustment units. The positive electrode of the battery core can be coupled to the first end of the power management module through M first impedance adjustment units, and the negative electrode of the battery core can be coupled to the second end of the power management module through M second impedance adjustment units. Alternatively, the negative electrode of the battery cell may be coupled to the first end of the power management module through M first impedance adjustment units, and the positive electrode of the battery cell may be coupled to the second end of the power management module through M second impedance adjustment units.

Illustratively, in connection with B in fig. 10, as shown in fig. 11, each of the above-described battery protection modules 800 may include: the output terminals of the plurality of control units 820 are coupled to the control terminals of the plurality of first impedance adjusting units 830, and the control terminals of the plurality of second impedance adjusting units 850, respectively. The positive electrode of the battery cell 840 is coupled to the power supply terminal of each control unit 820, and the positive electrode of the battery cell 840 is coupled to the first terminal of the power management module through the plurality of first impedance adjusting units 830 connected in series. The negative pole of the battery cell 840 is coupled to a second terminal of the power management module through a plurality of second impedance adjustment units 850 connected in series. A control terminal of each control unit 820 is coupled to the processor 218. During the charge or discharge of the first battery and the second battery, the processor 218 sends control information to the at least one control unit 820 based on the voltage of the first battery, the voltage of the second battery. The control information may instruct the control unit 820 to adjust the impedance of the first impedance adjustment unit 830 coupled to the control unit 820. And/or, the control information may instruct the control unit 820 to adjust the impedance of the second impedance adjustment unit 850 coupled to the control unit 820. That is, one control unit may adjust the impedance of at least one impedance adjustment unit coupled thereto.

Alternatively, the control information may be any one of a direct current signal, a square wave signal, and a communication protocol signal (e.g., a bidirectional serial bus (I2C) protocol signal). When the control information is a square wave signal, the charge and discharge circuit provided by the embodiment of the application can further comprise 2M filter circuits. Wherein, M filter circuits correspond to the first battery, and M filter circuits correspond to the second battery. For a battery, the processor is respectively coupled to the control ends of the M control units through the M filter circuits to obtain direct current signals after filtering the square wave signals. When the control information is a communication protocol signal, the charge-discharge circuit provided by the embodiment of the application may or may not include a filter circuit. The filter circuit may be a circuit composed of a capacitor and an inductor, but is not limited thereto.

Taking m=1 as an example, in conjunction with a in fig. 9, as shown in fig. 12, a first terminal of the filter circuit 1101 is coupled to the processor 218, and a second terminal of the filter circuit 1101 is coupled to a control terminal of the protection chip 1102 (i.e., the control unit). In this way, the filter circuit 1101 can filter the control information and transmit the control information to the protection chip 1102.

The detailed connection relationship between the processor and the first and second batteries will be described below by taking the example that the input ends of M impedance adjusting units connected in series are coupled to the negative electrode of the battery cell.

In one embodiment, in conjunction with a in fig. 10, as shown in fig. 13, the first battery 212 includes a first battery cell 410 and a first battery protection module 420, and the first battery protection module 420 includes a first protection chip 1201 and a first impedance adjustment unit a1202. The positive electrode of the first battery cell 410 is coupled to the power supply terminal of each first protection chip 1201, the first terminal of the power management module 211, and the negative electrode of the first battery cell 410 is coupled to the input terminals of the plurality of first impedance adjustment units a1202 connected in series. The output terminals of the plurality of first impedance adjusting units a1202 connected in series are coupled to the second terminal of the power management module 211. The control terminal of each first protection chip 1201 is coupled to the processor 218, and the output terminals of the plurality of first protection chips 1201 are respectively coupled to the control terminals of the plurality of first impedance adjusting units a1202. The first monitoring module 216 is coupled to the positive electrode of the first battery 212 (i.e., the positive electrode of the first battery cell 410), the negative electrode of the first battery 212 (i.e., the output terminals of the plurality of first impedance adjustment units a1202 connected in series).

The second battery 213 includes a second battery cell 430 and a second battery protection module 440, and the second battery protection module 440 includes a second protection chip 1203 and a first impedance adjusting unit B1204. The positive electrode of the second battery cell 430 is coupled to the power supply terminal of the second protection chip 1203 and the first terminal of the power management module 211, and the negative electrode of the second battery cell 430 is coupled to the input terminals of the plurality of first impedance adjusting units B1204 connected in series. The output terminals of the plurality of first impedance adjusting units B1204 connected in series are coupled to the second terminal of the power management module 211. The output terminals of the second protection chips 1203 are respectively coupled to the control terminals of the first impedance adjusting units B1204. The second monitoring module 217 is coupled to the positive electrode of the second battery 213 (i.e. the positive electrode of the second battery cell 430), the negative electrode of the second battery 213 (i.e. the output terminals of the plurality of first impedance adjusting units B1204 connected in series).

During the charge and discharge of the first battery 212 and the second battery 213, the processor 218 transmits control information to each of the first protection chips 1201 according to the voltage of the first battery 212, the voltage of the second battery 213. The control information may be used to instruct the first protection chip 1201 to adjust the impedance of the first impedance adjustment unit a 1202. That is, by adjusting the impedance of the first impedance adjusting unit a1202, the impedance of the first battery protection module 420 can be adjusted. For a specific adjustment process, reference may be made to the above description of the impedance adjustment process of the first battery protection module, which is not repeated herein.

In another embodiment, as shown in fig. 14 in conjunction with fig. 13, the control terminal of each first protection chip 1201 is not coupled to the processor 218, and the control terminal of each second protection chip 1203 is coupled to the processor 218. During the charge and discharge of the first battery 212 and the second battery 213, the processor 218 transmits control information to the second protection chip 1203 according to the voltage of the first battery 212 and the voltage of the second battery 213. The control information may be used to instruct the second protection chip 1203 to adjust the impedance of the first impedance adjustment unit B1204. That is, by adjusting the impedance of the first impedance adjusting unit B1204, the impedance of the second battery protection module 440 may be adjusted. For a specific adjustment process, reference may be made to the above description of the impedance adjustment process of the second battery protection module, which is not repeated herein.

In another embodiment, referring to fig. 13 and 14, as shown in fig. 15, the control terminal of the first protection chip 1201 and the control terminal of the second protection chip 1203 are coupled to the processor 218. During the charge and discharge of the first battery 212 and the second battery 213, the processor 218 sends control information to the first protection chip 1201 according to the voltage of the first battery 212 and the voltage of the second battery 213, and the control information may be used to instruct the first protection chip 1201 to adjust the impedance of the first impedance adjusting unit a 1202; and/or, the processor 218 sends control information to the second protection chip 1203 according to the voltage of the first battery 212 and the voltage of the second battery 213, and the control information may be used to instruct the second protection chip 1203 to adjust the impedance of the first impedance adjusting unit B1204. The specific adjustment process is not described here in detail.

Next, with reference to fig. 16 to 22, a possible structure of the first impedance adjusting unit 830 and the detailed procedure of the above step S702 will be described.

Alternatively, in combination with a in fig. 9, as shown in a in fig. 16, each of the above-described impedance adjusting units 830 may include a first switching element 1501 and a second switching element 1502. Wherein, the control terminal of the first switching element 1501 is coupled to the output terminal of the control unit 820, the first terminal of the first switching element 1501 is coupled to the negative electrode of the battery cell, the second terminal of the first switching element 1501 is coupled to the second terminal of the second switching element 1502, the control terminal of the second switching element 1502 is coupled to the output terminal of the control unit 820, the first terminal of the second switching element 1502 is the negative electrode of the battery cell, and the control terminal of the second switching element 1502 can be coupled to the power supply terminal (not shown in fig. 15) of the load circuit 220 through the power management module.

During the charge and discharge of the first battery and the second battery, the processor may send control information to at least one control unit in at least one battery protection module according to the voltage of the first battery and the voltage of the second battery. The control information may be used to instruct the control unit to adjust the impedance of the first switching element in the first impedance adjustment unit coupled thereto, and/or the control information may be used to instruct the control unit to adjust the impedance of the second switching element in the first impedance adjustment unit coupled thereto.

That is, during the charge and discharge of the first battery and the second battery, the processor may equalize the charge and discharge of the first battery and the second battery by adjusting the impedance of at least one first switching element and/or the impedance of at least one second switching element in the first battery protection module so that the pressure difference between the first battery and the second battery is less than the target threshold value according to the voltage of the first battery and the voltage of the second battery; the first battery and the second battery can be charged and discharged uniformly by adjusting the impedance of at least one first switching element and/or the impedance of at least one second switching element in the second battery protection module so that the pressure difference between the first battery and the second battery is smaller than a target threshold value; the impedance of at least one first switching element and/or the impedance of at least one second switching element in the first battery protection module may be adjusted, and the impedance of at least one first switching element and/or the impedance of at least one second switching element in the second battery protection module may be adjusted so that the differential pressure between the first battery and the second battery is smaller than the target threshold value, thereby equalizing charge and discharge of the first battery and the second battery. For the specific adjustment process, reference may be made to the impedance of the first battery protection module and/or the impedance of the second battery protection module, which are not described herein.

Illustratively, as shown in B in fig. 16, the first switching element 1501 and the second switching element 1502 according to the embodiment of the present application may be field effect transistors (e.g., N-type field effect transistors or P-type field effect transistors). For example, the first end of the first switching element (or the second switching element) may be a source of an N-type field effect transistor, and the second end of the first switching element (or the second switching element) may be a drain of an N-type field effect transistor. For another example, the first end of the first switching element (or the second switching element) may be a drain of an N-type field effect transistor, and the second end of the first switching element (or the second switching element) may be a source of an N-type field effect transistor. That is, each impedance adjusting unit may include two field effect transistors connected in opposite directions.

As shown by C in fig. 16, in adjusting the impedance of one impedance adjustment unit including each switching element (equivalent to adjusting the impedance of the impedance adjustment unit), each switching element can be made to be in a variable resistance state by adjusting the voltage of the control terminal of each switching element. At this time, each switching element corresponds to a slide varistor (or variable resistor). Meanwhile, in the case where the switching elements are in the variable resistance state, the magnitude of the impedance of each switching element can be adjusted by adjusting the magnitude of the voltage of the control terminal of the switching element. The adjustment range of the impedance may be 0-maximum impedance. The maximum impedance of the switching elements of different models is different. When the impedance is 0, the switching element (such as a field effect transistor) is in a fully-on state; when the impedance is the maximum impedance, the switching element (e.g., a field effect transistor) is in an off state.

Optionally, when the control unit (e.g. the protection chip) does not have a control terminal, i.e. the control unit cannot be coupled to the processor, the processor cannot send control information to the control unit. Therefore, the processor cannot directly adjust the impedance of the first impedance adjusting unit (or the second impedance adjusting unit) through the control unit. At this time, the charge and discharge circuit provided in the embodiment of the present application may further include 2N voltage divider sub-circuits. N is a positive integer, and N is less than or equal to M. The first battery may correspond to N voltage divider sub-circuits and the second battery may correspond to another N voltage divider sub-circuits.

Specifically, for one battery, each voltage divider sub-circuit is coupled to the processor, and the N voltage divider sub-circuits are also coupled to N control units of the M control units, respectively. The positive electrode of the battery core is coupled to the control ends of the N impedance adjusting units through N voltage dividing sub-circuits and N control units. The positive electrode of the battery cell is also directly coupled to the control ends of the (M-N) impedance adjusting units through the (M-N) control units. The (M-N) control units are control units other than the N control units. The (M-N) impedance adjusting units are impedance adjusting units other than the N impedance adjusting units. All the voltage dividing subcircuits may be located in the battery protection board module of the battery, or may be located outside the battery, which is not limited in the embodiment of the present application. The positional relationship between the voltage dividing sub-circuit and the battery does not affect the connection relationship between the voltage dividing sub-circuit and other parts in the electronic equipment.

In the following, taking an example that N is smaller than M and the voltage divider circuit is located in the battery protection module in the battery, a possible structure of the voltage divider circuit, a connection relationship between the voltage divider circuit and the battery and the processor, and the detailed steps of the step S702 are described.

Alternatively, as shown in fig. 17, the power supply terminals of the N voltage divider sub-circuits 1600 are coupled to the positive electrode of the cell 840. The output terminals of the N voltage dividing sub-circuits 1600 are respectively coupled to the power supply terminals of the N control units 820. The power terminals of the other (M-N) control units 820, except for those coupled to the N voltage divider sub-circuits 1600, are directly coupled to the positive electrode of the cell 840. A control terminal of each voltage divider sub-circuit 1600 is coupled to the processor 218. The output terminals of the M control units 820 are coupled to the control terminals of the M first impedance adjusting units 830, respectively.

During the process of charging or discharging the first battery and the second battery, the processor sends control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information may instruct the voltage divider sub-circuit to adjust an input voltage of at least one control unit to adjust an impedance of at least one first impedance adjusting unit 830 respectively coupled to an output terminal of the at least one control unit. Since the input voltage of each control unit 820 is equal to the output voltage, adjusting the input voltage of each of the at least one control unit is equivalent to adjusting the output voltage of each of the at least one control unit. The output voltage of each of the at least one control unit corresponds to the voltage of the control terminal of the at least one first impedance adjusting unit coupled to the output terminal of the at least one control unit, respectively. Adjusting the voltage at the control end of the first impedance adjusting unit corresponds to adjusting the impedance of the first impedance adjusting unit, and thus adjusting the input voltage of each of the at least one control unit corresponds to adjusting the impedance of each of the at least one first impedance adjusting unit.

Optionally, in conjunction with fig. 11 and 17, as shown in fig. 18, the output terminals of the M control units 820 are further coupled to the control terminals of the M second impedance adjusting units 850, respectively. Thus, during the process of charging or discharging the first battery and the second battery, the processor sends control information to the at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information may instruct the voltage divider sub-circuit to adjust an input voltage of the at least one control unit to adjust an impedance of the at least one first impedance adjusting unit 830 and/or an impedance of the at least one second impedance adjusting unit 850 coupled to output terminals of the at least one control unit, respectively.

Alternatively, as shown in fig. 19, the power supply terminals of the M control units 820 are coupled to the positive electrode of the battery cell 840. The output terminals of the N control units 820 are respectively coupled to the power supply terminals of the N voltage dividing sub-circuits 1600. A control terminal of each voltage divider sub-circuit 1600 is coupled to the processor 218. The output terminals of the N voltage dividing sub-circuits 1600 are respectively coupled to the control terminals of the N first impedance adjusting units 830. The output terminals of the (M-N) control units 820 are directly coupled to the control terminals of the (M-N) first impedance adjusting units 830, respectively. The (M-N) control units 820 are other control units 820 than those coupled to the N voltage divider sub-circuits 1600. The (M-N) first impedance adjusting units 830 are other first impedance adjusting units than those coupled to the N voltage divider sub-circuits 1600.

During the process of charging or discharging the first battery and the second battery, the processor sends control information to at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information may instruct the voltage divider circuit to adjust an output voltage of the voltage divider circuit to adjust an impedance of at least one first impedance adjustment unit respectively coupled to the output terminals of the at least one voltage divider circuit. The output voltage of the at least one voltage divider circuit corresponds to the voltage of the control terminal of the at least one first impedance adjusting unit coupled thereto, respectively. Adjusting the voltage at the control terminal of the first impedance adjusting unit corresponds to adjusting the impedance of the first impedance adjusting unit. Thus, adjusting the output voltage of each of the at least one voltage divider circuit corresponds to adjusting the impedance of each of the at least one first impedance adjusting unit.

Optionally, as shown in fig. 20 in conjunction with fig. 11 and 19, the output terminals of the N voltage divider sub-circuits 1600 are further coupled to the control terminals of the N second impedance adjusting units 850, respectively, and the output terminals of the remaining (M-N) control units are also directly coupled to the control terminals of the remaining (M-N) second impedance adjusting units 850, respectively. Thus, during the process of charging or discharging the first battery and the second battery, the processor sends control information to the at least one voltage dividing sub-circuit according to the voltage of the first battery and the voltage of the second battery. The control information may instruct the voltage divider circuit to adjust an output voltage of the voltage divider circuit to adjust an impedance of the at least one first impedance adjusting unit 830 and/or an impedance of the at least one second impedance adjusting unit 850 coupled to the output terminal of the at least one control unit, respectively.

Alternatively, each voltage divider sub-circuit may include: a fixed resistor and a third switching element connected in series. The connection relation between the fixed resistor, the third switch element, the battery core, the control unit and the processor is described below.

In one embodiment, N voltage divider circuits are respectively located between the positive electrode of the battery cell and the N control units. As shown in fig. 21, a first terminal of the fixed resistor 1801 is coupled to the positive electrode of the battery cell 840, and a second terminal of the fixed resistor 1801 is coupled to a first terminal of the third switching element 1802 and a power supply terminal of the control unit 820. The control terminal of the third switching element 1802 is coupled to the processor 218. The second terminal of the third switching element 1802 is coupled to the ground terminal of the electronic device.

During the charge and discharge of the first battery and the second battery, the processor 218 sends control information to the third switching element 1802 according to the voltage of the first battery and the voltage of the second battery, and adjusts the impedance of the third switching element 1802. Since the fixed resistor 1801 and the third switching element 1802 are connected in series, and the input voltage of the control unit 820 is related to the voltage of the third switching element, the voltage of the third switching element 1802 is related to the impedance of the third switching element 1802. Accordingly, the processor 218 adjusts the impedance of the third switching element 1802, and may adjust the input voltage of the control unit 820.

It should be noted that the third switching element may be a field effect transistor (e.g., an N-type field effect transistor or a P-type field effect transistor).

In another embodiment, N voltage dividing sub-circuits are respectively located between the N control units and the N impedance adjusting units. As shown in fig. 22, a first terminal of the fixed resistor 1801 is coupled to an output terminal of the control unit 820, and a second terminal of the fixed resistor 1801 is coupled to a first terminal of the third switching element 1802 and a control terminal of the first impedance adjusting unit 830. The control terminal of the third switching element 1802 is coupled to the processor 218. The second terminal of the third switching element 1802 is coupled to the ground terminal of the electronic device.

Of course, the second terminal of the fixed resistor 1801 may also be coupled to the control terminal of a second impedance adjustment unit (not shown in fig. 22).

During the charge and discharge of the first battery and the second battery, the processor 218 sends control information to the third switching element 1802 according to the voltage of the first battery and the voltage of the second battery, and adjusts the impedance of the third switching element 1802. Since the fixed resistor 1801 and the third switching element 1802 are connected in series, and the voltage of the control terminal of the first impedance adjusting unit 830 (and/or the second impedance adjusting unit) is related to the voltage of the third switching element 1802, the voltage of the third switching element 1802 is related to the impedance of the third switching element 1802. Accordingly, the processor 218 adjusts the impedance of the third switching element 1802, and may adjust the voltage of the control terminal of the first impedance adjusting unit 830 (and/or the second impedance adjusting unit).

Optionally, when the charge-discharge circuit provided in the embodiment of the present application further includes 2N voltage divider circuits and the control information is a square wave signal or a communication protocol signal, the charge-discharge circuit may further include 2N filter circuits. The N filter circuits correspond to the first battery, and the other N filter circuits correspond to the second battery. For a battery, the processor may be coupled to the control terminals of the N voltage dividing sub-circuits through N filtering circuits, respectively, for filtering the wave signal or the communication protocol signal.

Specifically, when the charge-discharge circuit provided in the embodiment of the present application further includes a filter circuit, the processor may be coupled to the control terminal of the third switching element through the filter circuit.

In summary, the charge-discharge circuit provided in the embodiment of the present application has no additional equalization module, and in the process of charging or discharging the battery, the processor may adjust the impedance of at least one impedance adjustment unit in the battery, so as to achieve the purpose of equalizing charge equalization or discharge equalization of each battery, thereby enabling each battery to be fully charged in the charging process, and each battery may release more electric quantity in the discharging process. Since the equalization module is not additionally added, the area of the charge-discharge circuit is reduced, and the cost of the electronic device is reduced. That is, the charge-discharge circuit and the control method provided by the embodiment of the application can solve the problem of unbalanced charge-discharge of each battery in the battery pack at low cost.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system, apparatus and module may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, e.g., the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple modules or components may be combined or integrated into another device, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.

The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physically separate, i.e., may be located in one device, or may be distributed over multiple devices. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in the embodiments of the present application may be integrated in one device, or each module may exist alone physically, or two or more modules may be integrated in one device.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A charge-discharge circuit, comprising: a processor, a first battery and a second battery connected in parallel with each other; the first battery comprises a first battery protection module, and the second battery comprises a second battery protection module;

The processor is coupled to the first battery protection module, and during charging or discharging of the first battery and the second battery, the processor is configured to: adjusting the impedance of the first battery protection module according to the voltage of the first battery and the voltage of the second battery;

and/or the number of the groups of groups,

the processor is coupled to the second battery protection module, and during charging or discharging of the first battery and the second battery, the processor is configured to: and adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery.

2. The circuit of claim 1, wherein each battery further comprises a cell, each battery protection module comprises M control units and M first impedance adjustment units connected in series, and the output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units; the positive electrode of the battery cell is coupled to the power supply end of each control unit; the positive electrode of the battery cell or the negative electrode of the battery cell is coupled to the input ends of the M first impedance adjustment units; a control terminal of at least one of the control units is coupled to the processor; and M is a positive integer.

3. The circuit of claim 1, wherein each battery further comprises a cell, each battery protection module comprises M control units, M first impedance adjustment units in series, and M second impedance adjustment units in series, wherein the output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units and the control ends of the M second impedance adjustment units; the anodes of the battery cells are coupled to the power supply end of each control unit and the input ends of the M first impedance adjustment units; the cathodes of the electric cores are coupled to the input ends of the M second impedance adjusting units; a control terminal of at least one of the control units is coupled to the processor; and M is a positive integer.

4. The circuit of claim 2, wherein the charge-discharge circuit further comprises N voltage divider sub-circuits; each of the voltage divider subcircuits is coupled to the processor; the N voltage dividing subcircuits are respectively coupled to N control units in the M control units; the positive electrode of the battery cell is coupled to the control ends of the N first impedance adjustment units through the N voltage divider circuits and the N control units; the positive electrode of the battery cell is coupled to the control ends of the (M-N) first impedance adjusting units through the (M-N) control units; the (M-N) control units are control units other than the N control units; (M-N) the first impedance adjusting units are first impedance adjusting units other than the N first impedance adjusting units; the N is a positive integer, and the N is less than or equal to the M.

5. The circuit of claim 3, wherein the charge-discharge circuit further comprises N voltage divider sub-circuits; each of the voltage divider subcircuits is coupled to the processor; the N voltage dividing subcircuits are respectively coupled to N control units in the M control units; the positive electrode of the battery core is coupled to the control ends of the N first impedance adjustment units and the control ends of the N second impedance adjustment units through the N voltage divider circuits and the N control units; the positive electrode of the battery cell is coupled to the control ends of the (M-N) first impedance adjusting units and the control ends of the (M-N) second impedance adjusting units through the (M-N) control units; (M-N) said control units being control units other than said N control units; (M-N) the first impedance adjusting units being first impedance adjusting units other than the N first impedance adjusting units, and (M-N) the second impedance adjusting units being second impedance adjusting units other than the N second impedance adjusting units; the N is a positive integer, and the N is less than or equal to the M.

6. The circuit of claim 4, wherein a power supply terminal of each voltage divider circuit is coupled to the positive electrode of the cell and a control terminal of each voltage divider circuit is coupled to the processor; the output ends of the N voltage dividing sub-circuits are respectively coupled to the power supply ends of the N control units; the power supply terminals of other (M-N) control units except the N voltage dividing sub-circuits are coupled to the positive electrode of the battery cell; the output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units.

7. The circuit of claim 5, wherein a power supply terminal of each voltage divider circuit is coupled to the positive electrode of the cell and a control terminal of each voltage divider circuit is coupled to the processor; the output ends of the N voltage dividing sub-circuits are respectively coupled to the power supply ends of the N control units; the power supply terminals of other (M-N) control units except the N voltage dividing sub-circuits are coupled to the positive electrode of the battery cell; the output ends of the M control units are respectively coupled to the control ends of the M first impedance adjustment units and the control ends of the M second impedance adjustment units.

8. The circuit of claim 4, wherein a power terminal of each control unit is coupled to the positive electrode of the cell; the output ends of the N control units are respectively coupled to the power supply ends of the N voltage divider circuits; a control terminal of each of the voltage dividing subcircuits is coupled to the processor; the output ends of the N voltage dividing subcircuits are respectively coupled to the control ends of the N first impedance adjusting units; the output ends of the (M-N) control units are respectively coupled to the control ends of the (M-N) first impedance adjusting units.

9. The circuit of claim 5, wherein a power terminal of each control unit is coupled to the positive terminal of the cell; the output ends of the N control units are respectively coupled to the power supply ends of the N voltage divider circuits; a control terminal of each of the voltage dividing subcircuits is coupled to the processor; the output ends of the N voltage dividing sub-circuits are respectively coupled to the control ends of the N first impedance adjusting units and the control ends of the N second impedance adjusting units; the output ends of the (M-N) control units are respectively coupled to the control ends of the (M-N) first impedance adjusting units and the control ends of the (M-N) second impedance adjusting units.

10. The circuit of any of claims 4-9, wherein the N voltage divider sub-circuits are located outside a battery or in the battery protection module.

11. The circuit of any of claims 4-9, wherein the charge-discharge circuit is configured to supply power to a load circuit; each impedance adjusting unit includes a first switching element and a second switching element; the control end of the first switching element is coupled to the output end of the control unit or the output end of the voltage divider circuit, the first end of the first switching element is coupled to the positive electrode of the battery cell or the negative electrode of the battery cell, the second end of the first switching element is coupled to the second end of the second switching element, the control end of the second switching element is coupled to the output end of the control unit or the output end of the voltage divider circuit, and the first end of the second switching element is used for being coupled to the power supply end of the load circuit.

12. A charge-discharge circuit, comprising: a processor, a first battery and a second battery connected in parallel with each other; the first battery comprises a first battery protection module, and the second battery comprises a second battery protection module;

the processor is coupled to the first battery protection module, the second battery protection module, and during charging or discharging of the first battery and the second battery, the processor is configured to: and adjusting the impedance of the first battery protection module or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery.

13. A control method of a charge-discharge circuit, characterized by being applied to the circuit of any one of claims 1 to 11 or claim 12; the control method comprises the following steps:

and adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery.

14. The control method according to claim 13, wherein each battery protection module includes M control units, M first impedance adjustment units connected in series, M being a positive integer; the adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery comprises:

Transmitting control information to at least one control unit according to the voltage of the first battery and the voltage of the second battery; the control information is used for instructing the control unit to adjust the impedance of the first impedance adjustment unit.

15. The control method according to claim 13, wherein each battery protection module includes M control units, M first impedance adjustment units connected in series, and M second impedance adjustment units connected in series, M being a positive integer; the adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery comprises:

transmitting control information to at least one control unit according to the voltage of the first battery and the voltage of the second battery; the control information is used for instructing the control unit to adjust the impedance of the first impedance adjustment unit, and/or the control information is used for instructing the control unit to adjust the impedance of the second impedance adjustment unit.

16. The control method according to claim 14, wherein the charge-discharge circuit further includes N voltage divider circuits, wherein N is a positive integer, and wherein N is less than or equal to M; the adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery comprises:

Transmitting control information to at least one voltage divider sub-circuit according to the voltage of the first battery and the voltage of the second battery; the control information is used for instructing the voltage dividing sub-circuit to adjust the impedance of the first impedance adjusting unit.

17. The control method according to claim 15, wherein the charge-discharge circuit further includes N voltage divider circuits, wherein N is a positive integer, and wherein N is less than or equal to M; the adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery comprises:

transmitting control information to at least one voltage divider sub-circuit according to the voltage of the first battery and the voltage of the second battery; the control information is used for indicating the voltage divider circuit to adjust the impedance of the first impedance adjusting unit, and/or the control information is used for indicating the voltage divider circuit to adjust the impedance of the second impedance adjusting unit.

18. The control method according to claim 16, wherein the N voltage divider circuits are respectively located between the positive electrode of the battery cell and the power supply terminals of the N control units; the voltage divider circuit is used for dividing the voltage of the first battery into a plurality of voltage division sub-circuits; the control information is used for instructing the voltage dividing sub-circuit to adjust the impedance of the first impedance adjusting unit, and includes:

Transmitting control information to at least one voltage divider sub-circuit according to the voltage of the first battery and the voltage of the second battery; the control information is used for indicating the voltage dividing sub-circuit to adjust the input voltage of the control unit so as to adjust the impedance of the first impedance adjusting unit.

19. The control method according to claim 17, wherein the N voltage divider circuits are respectively located between the positive electrode of the battery cell and the power supply terminals of the N control units; the voltage divider circuit is used for dividing the voltage of the first battery into a plurality of voltage division sub-circuits; the control information is used for instructing the voltage dividing sub-circuit to adjust the impedance of the first impedance adjusting unit, and includes:

transmitting control information to at least one voltage divider sub-circuit according to the voltage of the first battery and the voltage of the second battery; the control information is used for instructing the voltage divider sub-circuit to adjust the input voltage of the control unit so as to adjust the impedance of the first impedance adjustment unit and/or adjust the impedance of the second impedance adjustment unit.

20. The control method according to claim 16, wherein the N voltage dividing sub-circuits are respectively located between the N control units and the N first impedance adjusting units; the voltage divider circuit is used for dividing the voltage of the first battery into a plurality of voltage division sub-circuits; the control information is used for instructing the voltage dividing sub-circuit to adjust the impedance of the first impedance adjusting unit, and includes:

Transmitting control information to at least one voltage divider sub-circuit according to the voltage of the first battery and the voltage of the second battery; the control information is used for indicating the voltage divider circuit to adjust the output voltage of the voltage divider circuit so as to adjust the impedance of the first impedance adjusting unit.

21. The control method according to claim 17, wherein the N voltage dividing sub-circuits are respectively located between the N control units and the N first impedance adjusting units, the N second impedance adjusting units; the voltage divider circuit is used for dividing the voltage of the first battery into a plurality of voltage division sub-circuits; the control information is used for instructing the voltage divider sub-circuit to adjust the impedance of the first impedance adjustment unit, and/or the control information is used for instructing the voltage divider sub-circuit to adjust the impedance of the second impedance adjustment unit, and comprises:

and sending control information to at least one voltage divider circuit according to the voltage of the first battery and the voltage of the second battery, wherein the control information is used for instructing the voltage divider circuit to adjust the output voltage of the voltage divider circuit so as to adjust the impedance of the first impedance adjusting unit and/or adjust the impedance of the second impedance adjusting unit.

22. The control method according to any one of claims 16 to 21, wherein each of the impedance adjusting units includes a first switching element and a second switching element; the adjusting the impedance of the first battery protection module and/or the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery comprises:

transmitting control information to at least one control unit according to the voltage of the first battery and the voltage of the second battery, wherein the control information is used for instructing the control unit to adjust the impedance of the first switching element and/or the control information is used for instructing the control unit to adjust the impedance of the second switching element;

or alternatively, the process may be performed,

and sending control information to at least one voltage divider circuit according to the voltage of the first battery and the voltage of the second battery, wherein the control information is used for instructing the voltage divider circuit to adjust the impedance of the first switching element, and/or the control information is used for instructing the voltage divider circuit to adjust the impedance of the second switching element.

23. The control method according to any one of claims 13 to 21, wherein adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery during charging includes:

Increasing the impedance of the first battery protection module and/or decreasing the impedance of the second battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than a target threshold;

and/or the number of the groups of groups,

24. The control method according to any one of claims 13 to 21, wherein adjusting the impedance of the first battery protection module and/or adjusting the impedance of the second battery protection module according to the voltage of the first battery and the voltage of the second battery during discharging comprises:

increasing the impedance of the second battery protection module and/or decreasing the impedance of the first battery protection module when the voltage of the first battery is greater than the voltage of the second battery and the difference between the voltage of the first battery and the voltage of the second battery is greater than a target threshold;

And/or the number of the groups of groups,

25. An electronic device comprising a load circuit and any one of claims 1-11, or the charge-discharge circuit of claim 12; the charging and discharging circuit also comprises a power management module; the power management module is coupled to the first battery protection module, the second battery protection module, the processor, and the load circuit of the charge-discharge circuit; the processor is also coupled to the load circuit.

26. A computer readable storage medium comprising instructions which, when executed on an electronic device, cause the electronic device to perform the method of any of claims 13-24.