Power adjusting device and charging system

Abstract

The invention provides a charging system. The charging system comprises a first device; a second device; the power regulation device comprises a direct current-direct current conversion unit; the micro-control unit is used for receiving the charging instruction, the first electric power information of the first device and the second electric power information of the second device, and executing the following steps: when the charging instruction indicates that the first device charges the second device, according to the first electric power information and the second electric power information; controlling the DC-DC conversion unit to convert a first power supply current received by the first device into a first charging current so as to charge a second device; and when the charging instruction indicates that the second device charges the first device, controlling the DC-DC conversion unit to convert a second power supply current received by the second device into a second charging current to charge the first device according to the first electric power information and the second electric power information.

Description

Technical Field

[0001] The present invention relates to a power conditioning device and a charging system, and more particularly to a power conditioning device and a charging system capable of bidirectional charging and discharging. Background Art

[0002] With the popularization of electric vehicles, the application of light electric vehicles has also received attention, including electric assisted bicycles, electric motorcycles, electric wheelchairs, or golf carts, etc. At present, the development of light electric vehicles is limited by the battery capacity, thus limiting the endurance. Therefore, it is necessary to connect more batteries in parallel to increase the capacity. For example, a light electric vehicle can be provided with a main battery and one or more auxiliary batteries to increase the endurance. However, currently, light electric vehicles can only charge the main battery and auxiliary batteries through an AC charger, and cannot directly charge the main battery and auxiliary batteries with an external battery or other external power supplies. In addition, the main battery and auxiliary batteries of light electric vehicles cannot directly supply power to charge an external battery or other external devices.

[0003] Therefore, how to manage the power of external devices, the main battery, and the auxiliary battery, and control the external devices, the main battery, and the auxiliary battery to perform bidirectional charging and discharging has become one of the goals pursued by the industry. Summary of the Invention

[0004] The object of the present invention is to provide a power conditioning device and a charging system that can control external devices, the main battery, and the auxiliary battery to perform bidirectional charging and discharging, so that the charging system can be applicable to more specifications of charging devices and battery modules.

[0005] To achieve the above object, the present invention provides a power conditioning device and a charging system. The charging system includes:

[0006] A first device;

[0007] A second device; and

[0008] A power conditioning device, wherein the power conditioning device includes:

[0009] A DC-DC conversion unit coupled to the first device and the second device; and

[0010] A micro control unit coupled to the DC-DC conversion unit, the first device, and the second device, for receiving a charging instruction, first power information of the first device, and second power information of the second device, and performing the following steps:

[0011] When the charging instruction indicates that the first device charges the second device, according to the first power information and the second power information, control the DC-DC conversion unit to convert the first power supply current received by the first device into a first charging current to charge the second device; and

[0012] When the charging instruction indicates that the second device charges the first device, according to the first power information and the second power information, control the DC-DC conversion unit to convert the second power supply current received by the second device into a second charging current to charge the first device.

[0013] Preferably, the first device is an AC-DC voltage conversion device, and the second device is a battery module.

[0014] Preferably, the power regulation device further includes a first detection unit, coupled between the AC-DC voltage conversion device and the DC-DC conversion unit, and the first detection unit is used to detect the first power information;

[0015] Wherein, the first power information includes the output power of the AC-DC voltage conversion device, and the second power information includes the battery voltage and battery current of the battery module.

[0016] Preferably, the AC-DC voltage conversion device complies with the Universal Serial Bus Power Delivery (PD) standard or the Quick Charge (QC) standard.

[0017] Preferably, the first device is a first battery module, and the second device is a second battery module;

[0018] Wherein, the first power information includes the first battery voltage and first battery current of the first battery module, and the second power information includes the second battery voltage and second battery current of the second battery module.

[0019] Preferably, the power regulation device includes:

[0020] A DC-DC conversion unit, coupled to the first device and the second device; and

[0021] A micro control unit, coupled to the DC-DC conversion unit, the first device and the second device, used to receive a charging instruction, the first power information of the first device and the second power information of the second device, and perform the following steps:

[0022] When the charging instruction indicates that the first device charges the second device, according to the first power information and the second power information, control the DC-DC conversion unit to convert the first supply current received by the first device into a first charging current to charge the second device; and

[0023] When the charging instruction indicates that the second device charges the first device, according to the first power information and the second power information, control the DC-DC conversion unit to convert the second power supply current received by the second device into a second charging current to charge the first device.

[0024] Preferably, the first device is an AC-DC voltage conversion device, and the second device is a battery module.

[0025] Preferably, the power adjustment device further includes a first detection unit, coupled between the AC-DC voltage conversion device and the DC-DC conversion unit, and the first detection unit is used to detect the first power information;

[0026] Wherein, the first power information includes the output power of the AC-DC voltage conversion device, and the second power information includes the battery voltage and battery current of the battery module.

[0027] Preferably, the AC-DC voltage conversion device complies with the Universal Serial Bus (USB) Power Delivery (PD) standard or the Quick Charge (QC) standard.

[0028] Preferably, the first device is a first battery module, and the second device is a second battery module;

[0029] The first power information includes the first battery voltage and first battery current of the first battery module, and the second power information includes the second battery voltage and second battery current of the second battery module.

[0030] Compared with the prior art, the charging system provided by the present invention includes a first device, a second device and a power adjustment device; the power adjustment device includes a DC-DC conversion unit and a micro control unit. The micro control unit is coupled to the first and second devices and the DC-DC conversion unit. The micro control unit controls the DC-DC conversion unit to convert the power supply current received by one of the first and second devices into a charging current to charge the other one of the first and second devices based on the charging instruction, the power information of the first device and the power information of the second device. It effectively realizes that the first device and the second device can charge or discharge each other through the power adjustment device of the present invention, that is, two-way charge and discharge. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of a charging system according to Embodiment 1 of the present invention.

[0032] Figure 2 It is a schematic diagram of another charging system according to an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of another charging system according to an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of another charging system according to an embodiment of the present invention.

[0035] Figure 5 This is a flowchart of a charging method according to an embodiment of the present invention.

[0036] Figure 6 This is a flowchart of another charging method according to an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of another charging system according to an embodiment of the present invention. Detailed implementation manners

[0038] To further understand the purpose, structure, features, and functions of the present invention, the following provides a detailed description in conjunction with embodiments.

[0039] In the specification and claims, certain terms are used to refer to specific elements. Those of ordinary skill in the art should understand that manufacturers may use different terms to refer to the same element. The specification and claims do not use the difference in names as a way to distinguish elements, but use the difference in functions of elements as the criterion for distinction. The term "comprising" mentioned throughout the specification and claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect electrical connection means. Therefore, if it is described in the text that the first device is coupled to the second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0040] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the charging system 1 according to an embodiment of the present invention. The charging system 1 includes a first device 10, a second device 20, and a power conditioning device 30. The power conditioning device 30 is coupled to the first device 10 and the second device 20 and is used to control the first device 10 to discharge to charge the second device 20 or control the second device 20 to discharge to charge the first device 10. Specifically, the power conditioning device 30 includes a DC-DC conversion unit 301 and a micro control unit 302. The micro control unit 302 is coupled to the first device 10, the second device 20, and the DC-DC conversion unit 301 and is used to receive a charging instruction, first power information of the first device 10, and second power information of the second device 20. The charging instruction can instruct the first device 10 to discharge to charge the second device 20 or instruct the second device 20 to discharge to charge the first device 10. It should be noted that the charging instruction can be input by the user through a user interface (not shown inFigure 1 ) or by a controller (not shown in ) of the first device 10, the second device 20 or the power conditioning device 30 Figure 1 ) is generated, but not limited to this. In this way, the micro control unit 302 can perform the following steps: when the charging instruction instructs the first device 10 to charge the second device 20, according to the first power information and the second power information, the DC-DC conversion unit 301 is controlled to convert the first supply current received by the first device 10 into a first charging current to charge the second device 20; and when the charging instruction instructs the second device 20 to charge the first device 10, according to the first power information and the second power information, the DC-DC conversion unit 301 is controlled to convert the second supply current received by the second device 20 into a second charging current to charge the first device 10. In short, the first device 10 and the second device 20 can charge or discharge each other through the power conditioning device 30 of the present invention, that is, bidirectional charging and discharging.

[0041] It should be noted that Figure 1 This is only an embodiment of the present invention. A person with ordinary knowledge in the field can make appropriate adjustments according to the needs of the system. For example, the charging system of the present invention can be applied to an electric-assisted bicycle, but it is not limited to this. As long as it is applied to a charging system that requires bidirectional charging and discharging functions, it should fall within the scope of the present invention. For the convenience of explanation, in the following embodiments, the charging system is applied to an electric-assisted bicycle.

[0042] In one embodiment, please refer to Figure 2 , Figure 2 is a schematic diagram of a charging system 2 according to an embodiment of the present invention. In the charging system 2, the first device 10 may be a first battery module 12, for example, a main battery module of an electric-assisted bicycle; the second device 20 may be a second battery module 22, for example, an auxiliary battery module of an electric-assisted bicycle. The microcontroller unit 302 may communicate with the first battery module 12 and the second battery module 22 through a communication interface to receive first power information and second power information. The first power information may include a first battery voltage and a first battery current of the first battery module 12, and the second power information may include a second battery voltage and a second battery current of the second battery module 22, but is not limited thereto. Specifically, the microcontroller unit 302 may determine the battery capacity of the first battery module 12 and the battery capacity of the second battery module 22 according to the charging instruction, the first power information and the second power information, and further determine the charging power or the discharging power. In this way, the microcontroller unit 302 may control the first battery module 12 and the second battery module 22 to charge and discharge each other at the charging power or the discharging power. It should be noted that the communication interface can be an inter-integrated circuit (I 2C), a universal asynchronous receiver / transmitter (UART) or a controller area network (CAN), but not limited thereto. In addition, vehicle communication protocols such as integrated bus circuits, universal asynchronous receiver / transmitters, and controller area networks are well known in the art and will not be described in detail.

[0043] In another embodiment, please refer to Figure 3 , Figure 3Schematic diagram of the charging system 3 according to an embodiment of the present invention. In the charging system 3, the first device 10 may be an AC-to-DC voltage conversion device 14. For example, a dedicated charger for an electric assist bicycle, or other chargers compliant with the Universal Serial Bus (USB) Power Delivery (PD) standard or Quick Charge (QC) standard; the second device 20 may be a second battery module 22. For example, the main battery module of an electric assist bicycle, an auxiliary battery module, or a combination of the main battery module and the auxiliary battery module. Specifically, if the AC-to-DC voltage conversion device 14 is a dedicated charger for an electric assist bicycle, the microcontroller unit 302 can communicate with the AC-to-DC voltage conversion device 14 and the second battery module 22 through a communication interface to receive the first power information and the second power information. Among them, the first power information may include an output power of the AC-to-DC voltage conversion device 14, and the second power information may include a second battery voltage and a second battery current of the second battery module 22, but not limited thereto. On the other hand, if the AC-to-DC voltage conversion device 14 is not a dedicated charger for an electric assist bicycle, the AC-to-DC voltage conversion device 14 may not have a communication function, that is, it will not provide the first power information to the microcontroller unit 302. Therefore, the power adjustment device 30 of the charging system 3 may further include a first detection unit 303 coupled between the AC-to-DC voltage conversion device 14 and the microcontroller unit 302. The first detection unit 303 can be used to detect the first power information of the AC-to-DC voltage conversion device 14, such as the output power, but not limited thereto. In this way, the microcontroller unit 302 can determine the charging power or the discharging power according to the first power information (output power) and the second power information, and control the AC-to-DC voltage conversion device 14 to charge the second battery module 22. On the other hand, the microcontroller unit 302 can transmit the second power information (second battery voltage and second battery current) of the second battery module 22 to the AC-to-DC voltage conversion device 14. In this way, the AC-to-DC voltage conversion device 14 can charge the second battery module 22 with a suitable input power according to the second power information. For example, the output voltage of a charger compliant with the Universal Serial Bus Power Delivery standard can be 5V, 9V, 15V, 20V, 28V, 36V or 48V, and the charger can charge the second battery module 22 with an output voltage suitable for the second battery module 22. In short, the charging system 3 can prevent the AC-to-DC voltage conversion device 14 from charging the second battery module 22 with an inappropriate specification and causing damage to the second battery module 22.

[0044] It should be noted that the power adjustment device 30 of the present invention can also be applied to a scenario where neither the first device 10 nor the second device 20 provides power information. In another embodiment, please refer to Figure 4 , Figure 4Schematic diagram of the charging system 4 according to an embodiment of the present invention. In the charging system 4, the first device 10 may be the third battery module 16. For example, it may be a mobile power supply that supports the Universal Serial Bus Power Delivery standard or the fast charging standard; the second device 20 may be the fourth battery module 24, for example, a mobile device. In other words, the charging system 4 can be applied to the scenario where the mobile power supply and the mobile device charge and discharge each other through the power regulation device 30. It should be noted that the third battery module 16 and the fourth battery module 24 may not provide their power information or may not be able to provide sufficient power information to the microcontroller unit 302. Therefore, as Figure 4 shown, the power regulation device 30 of the charging system 4 may further include a first detection unit 303 coupled between the third battery module 16 and the microcontroller unit 302 and a second detection unit 304 coupled between the fourth battery module 24 and the microcontroller unit 302. The first detection unit 303 can be used to detect the first power information of the alternating current to the third battery module 16, such as the output power, but not limited thereto. The second detection unit 304 can be used to detect the second power information of the fourth battery module 24, such as the input power, but not limited thereto. In this way, the microcontroller unit 302 can determine the charging power or the discharging power according to the first power information (output power) and the second power information (input power), and control the third battery module 16 to charge the fourth battery module 24, or the fourth battery module 24 to charge the third battery module 16. In another embodiment, the third battery module 16 may be an automotive battery module or other battery modules with a higher output voltage. For example, the third battery module 16 and the fourth battery module 24 may be battery modules of 12V, 24V, 36V, 48V, 72V or 96V. The first detection unit 303 detects that the output voltage of the third module 16 is between 9.6V and 14.4V, and the second detection unit 304 detects that the output voltage of the fourth module 24 is between 28.8V and 43.2V. The microcontroller unit 302 can then determine that the third battery module 16 is a 12V battery module and the fourth battery module 24 is a 36V battery module, and control the DC-DC conversion unit 301 to convert an appropriate charging current for the third battery module 16 and the fourth battery module 24 to charge and discharge each other. In short, even if the third battery module 16 and the fourth battery module 24 are not dedicated battery modules for electric assist bicycles, the power regulation device 30 can still control the third battery module 16 and the fourth battery module 24 to charge and discharge each other, and avoid damage to the third battery module 16 or the fourth battery module 24 caused by inappropriate charging specifications. In addition, it should be noted that regarding the third battery module 16 and the fourth battery module 24, in addition to the output voltage being different, the battery capacity can also be different.

[0045] Regarding the operation of the charging systems 1 to 4, it can be summarized as a charging method 5, as Figure 5 shown. The charging method 5 includes the following steps:

[0046] Step S500: Start.

[0047] Step S502: Detect or receive the first power information of the first device and the second power information of the second device.

[0048] Step S504: Control the first device and the second device to charge and discharge each other according to the first power information and the second power information.

[0049] Step S506: End.

[0050] For the detailed description of Process 5 and its derivatives, reference can be made to the foregoing description and will not be elaborated here.

[0051] It should be noted that Charging Systems 1-4 are different embodiments of the present invention, and those with general knowledge in the art can make different modifications accordingly, which are not limited thereto. For example, the microcontroller unit 302 can also perform the following functions: controlling the first device 10 or the second device 20 to preferentially supply power to the motor of the electric assist bicycle; controlling the first device 10 and the second device 20 to supply power to the motor of the electric assist bicycle simultaneously; controlling the one with the higher output voltage among the first device 10 and the second device 20 to supply power preferentially, but not limited thereto. For example, the microcontroller unit 302 can also perform the following functions: controlling the first device 10 to charge the second device 20 until the battery capacity of the second device 20 is full; controlling the first device 10 and the second device 20 to charge and discharge each other so that the battery power of the first device 10 and the second device 20 is balanced, but not limited thereto. For example, the microcontroller unit 302 can control the first device 10 and the second device 20 to charge and discharge each other in a constant voltage (CV) priority state, a constant current (CC) priority state, or a constant power (CP) priority state, but not limited thereto. For example, the first device 10 and the second device 20 are respectively the main battery and the backup battery of the electric assist bicycle, and the microcontroller unit 302 can execute Charging Method 6, as Figure 6 shown. Charging Method 6 includes the following steps:

[0052] Step S600: Start. The user inputs a charging instruction through the user interface.

[0053] Step S602: The main battery supplies power preferentially. The microcontroller unit 302 judges the first state of charge (SoC) of the main battery. When the first state of charge is less than the first critical value (for example, 0%), control the output voltage of the backup battery to be equal to the current battery voltage of the backup battery; when the first state of charge is greater than or equal to the first critical value, the backup battery does not discharge.

[0054] Step S604: The backup battery supplies power preferentially. The microcontroller unit 302 judges the second battery power state of the backup battery. When the second battery power state is less than or equal to the second critical value (for example, 0%), it controls the output voltage of the main battery to be equal to the current battery voltage of the main battery; when the second battery power state is greater than the second critical value, the main battery does not discharge. Step S606: The main battery and the backup battery supply power together. The microcontroller unit 302 judges the battery voltage of the main battery and the battery voltage of the backup battery. When the battery voltage difference between the main battery and the backup battery is less than the third critical value (for example, 0.5V), it controls the DC-DC conversion unit 301 to conduct; when the battery voltage difference between the main battery and the backup battery is greater than or equal to the third critical value and the battery voltage of the main battery is greater than the battery voltage of the backup battery, the backup battery does not discharge; when the battery voltage difference between the main battery and the backup battery is greater than or equal to the third critical value and the battery voltage of the main battery is less than or equal to the battery voltage of the backup battery, the main battery does not discharge.

[0055] Step S608: The main battery charges the backup battery. It is set that the backup battery is charged in a constant voltage (CV) priority state or a constant current (CC) priority state.

[0056] Step S610: The backup battery charges the main battery. It is set that the main battery is charged in a constant voltage (CV) priority state or a constant current (CC) priority state.

[0057] For the detailed description of charging method 6 and its derivative variations, reference can be made to the foregoing description, which will not be elaborated here.

[0058] It should be noted that charging systems 1 to 4 only represent the necessary components required to implement charging method 5, and their basic architectures are well known in the art, so they will not be elaborated. Those with ordinary knowledge in the art can appropriately add other components according to needs. For example, as Figure 7 shown, Figure 7 is a schematic diagram of charging system 7 according to an embodiment of the present invention. In charging system 7, the power conditioning device 30 controls the PD charger 18(10) to discharge to charge the main battery 28(20). The first detection unit 303 includes a power sensing circuit 3031 and a voltage sensing circuit 3032. In addition, the power conditioning device 30 further includes a DC control circuit 305 and a voltage and current sensing circuit 306. Specifically, when the power sensing circuit 3031 detects the PD charger 18, the power sensing circuit 3031 judges and passes through the integrated bus bar circuit I 2The C transfers the input power of the PD charger 18 to the microcontroller unit 302. Meanwhile, the main battery 28 transmits the power information of the main battery 28 to the microcontroller unit 302 via the Controller Area Network CANBUS. The microcontroller unit 302 can then, based on the input power of the PD charger 18 and the power information of the main battery 28, command the voltage and current control circuit 306 and the DC control circuit 305 to control the DC-DC conversion unit 301 to charge the main battery 28 from the PD charger 18. The operating principles of the power sensing circuit 3031, the voltage sensing circuit 3032, the DC control circuit 305, and the voltage and current sensing circuit 306 are well known in the art and will not be elaborated herein.

[0059] It should be noted that the charging systems 1 to 4 are embodiments of the present invention. Those with ordinary knowledge in the art can combine, modify, or vary the above-described embodiments in accordance with the spirit of the present invention, and are not limited thereto. All the above descriptions, steps, and / or processes (including the proposed steps) can be implemented by means of hardware, software, firmware (i.e., a combination of a hardware device and computer instructions, where the data in the hardware device is read-only software data), an electronic system, or a combination of the above devices. The hardware can include analog, digital, and hybrid circuits (i.e., microcircuits, microchips, or silicon wafers). The electronic system can include a system on chip (SoC), a system in package (SiP), a computer on module (CoM), and a computer system. The process steps and embodiments of the present invention can exist in the form of programs or instructions and be stored in a storage unit. The storage unit can be a computer-readable recording medium. The storage unit can include a read-only memory (ROM), a flash memory, a random-access memory (RAM), a subscriber identity module (SIM), a hard disk, or a CD-ROM / DVD-ROM / BD-ROM, but is not limited thereto. The above processes and embodiments can be compiled into program codes or instructions and stored in the storage unit. The microcontroller unit 302 can be used to read and execute the codes or instructions stored in the storage unit to implement all the above steps and functions.

[0060] In summary, in the charging system of the present invention, the power regulation device detects or receives the charging information of the first device and the second device, and controls the first device and the second device to perform bidirectional charging and discharging at a suitable charging specification to avoid damage to each other. In this way, compared with the prior art, the charging system of the present invention can support more charging device and battery module specifications.

[0061] The present invention has been described by the above related embodiments. However, the above embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and refinements made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention.

Claims

1. A charging system, characterized in that: Include: first device; Second device; as well as A power conditioning device, wherein the power conditioning device comprises: A DC-DC conversion unit coupled to the first device and the second device; as well as The micro control unit is coupled to the DC-DC conversion unit, the first device and the second device, and is used to receive a charging instruction, first power information of the first device and second power information of the second device, and perform the following steps: When the charging instruction instructs the first device to charge the second device, the DC-DC conversion unit is controlled to convert the first supply current received by the first device into a first charging current to charge the second device according to the first power information and the second power information; as well as When the charging instruction instructs the second device to charge the first device, the DC-DC conversion unit is controlled to convert the second supply current received by the second device into a second charging current to charge the first device according to the first power information and the second power information.

2. The charging system according to claim 1, characterized in that: The first device is an AC to DC transformer, and the second device is a battery module.

3. The charging system according to claim 2, characterized in that: The power regulating device further comprises a first detection unit coupled between the AC-DC transformer and the DC-DC converter unit, the first detection unit being used to detect the first power information; The first power information includes the output power of the AC-to-DC transformer, and the second power information includes the battery voltage and battery current of the battery module.

4. The charging system according to claim 2, characterized in that: The AC-DC transformer complies with the universal serial bus power delivery (Power Delivery, PD) standard or the quick charge (Quick Charge, QC) standard.

5. The charging system according to claim 1, characterized in that: The first device is a first battery module, and the second device is a second battery module; The first power information includes a first battery voltage and a first battery current of the first battery module, and the second power information includes a second battery voltage and a second battery current of the second battery module.

6. A power conditioning device, used for a first device and a second device, characterized in that: The power conditioning device comprises: A DC-DC conversion unit coupled to the first device and the second device; as well as The micro control unit is coupled to the DC-DC conversion unit, the first device and the second device, and is used to receive a charging instruction, first power information of the first device and second power information of the second device, and perform the following steps: When the charging instruction instructs the first device to charge the second device, the DC-DC conversion unit is controlled to convert the first supply current received by the first device into a first charging current to charge the second device according to the first power information and the second power information; as well as When the charging instruction instructs the second device to charge the first device, the DC-DC conversion unit is controlled to convert the second supply current received by the second device into a second charging current to charge the first device according to the first power information and the second power information.

7. The power conditioning device according to claim 6, characterized in that: The first device is an AC to DC transformer, and the second device is a battery module.

8. The power conditioning device according to claim 7, characterized in that: The power regulating device further comprises a first detection unit coupled between the AC-DC transformer and the DC-DC converter unit, the first detection unit being used to detect the first power information; The first power information includes the output power of the AC-to-DC transformer, and the second power information includes the battery voltage and battery current of the battery module.

9. The power conditioning device according to claim 7, characterized in that: The AC-to-DC transformer complies with the Universal Serial Bus (USB) Power Delivery (PD) standard or the Quick Charge (QC) standard.

10. The power conditioning device according to claim 6, characterized in that: The first device is a first battery module, and the second device is a second battery module; The first power information includes a first battery voltage and a first battery current of the first battery module, and the second power information includes a second battery voltage and a second battery current of the second battery module.

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