Battery management circuit, battery pack and electronic equipment

Abstract

The invention discloses a battery management circuit, a battery pack and electronic equipment, relates to the field of battery management, can control the connection state of a battery pack and a battery management chip through the battery management chip, further controls the connection and disconnection of the battery pack and a main control board, and improves the real-time performance of control. The battery management circuit is arranged on the battery pack, and the battery management circuit comprises a battery management chip and a battery pack control circuit; the battery management chip detects state parameters of a battery pack in the battery pack in real time; the battery management chip controls the connection state of the battery pack and the battery management chip through the battery pack control circuit according to the state parameters of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery management, and more particularly to a battery management circuit, battery pack, and electronic device. Background Technology

[0002] Currently, mobile phones and other electronic devices consist of a battery pack and a main control board. In the battery pack, each battery is connected to a battery management chip, and each battery management chip communicates with the power management chip on the main control board. Each battery management chip independently controls the connection status between its corresponding battery and the chip, and the power management chip uses these individual battery management chips to control the connection between the battery pack and the main control board.

[0003] Because each battery management chip individually controls the connection status between its corresponding battery and the chip, and each battery management chip communicates with the power management chip, the power management chip controls the connection status between its corresponding battery and the chip through each battery management chip, thereby controlling the on and off states of the battery pack and the main control board. Therefore, during the process of controlling the on and off states of the battery pack and the main control board, there will be time differences and asynchronous control, which will result in poor real-time control. Summary of the Invention

[0004] This application provides a battery management circuit, a battery pack, and an electronic device to improve the real-time performance of control.

[0005] To achieve the objective, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, a battery management circuit is provided, which is disposed on a battery pack. The battery management circuit includes a battery management chip and a battery pack control circuit. The battery management chip detects the status parameters of the battery pack in the battery pack in real time. Based on the status parameters of the battery pack, the battery management chip controls the connection status between the battery pack and the battery management chip through the battery pack control circuit.

[0007] The aforementioned battery management circuit can control the connection state between the battery pack and the battery management chip through a single battery management chip, thereby controlling the conduction and shutdown of the battery pack and the main control board. This improves upon the problems of poor real-time performance, high cost, low charging efficiency, high power consumption, complex control process, and inability to power on electronic devices caused by using multiple battery management chips to control the conduction and shutdown of the battery pack and the main control board. It improves real-time performance and charging efficiency, reduces cost and power consumption, simplifies the control process, and enables electronic devices to power on successfully.

[0008] In one possible implementation of the first aspect, the battery pack includes a first battery and a second battery, and the battery pack control circuit includes a first switch, a second switch, a third switch, and a fourth switch; a first terminal of the fourth switch is connected to a battery management chip, and a second terminal of the fourth switch is connected to the positive terminal of the first battery; the negative terminal of the first battery is connected to the first terminal of the first switch, and the second terminal of the first switch is connected to the positive terminal of the second battery; the negative terminal of the first battery is connected to the first terminal of the third switch, and the second terminal of the third switch is connected to the negative terminal of the second battery; a first terminal of the fourth switch is connected to the first terminal of the second switch, and the second terminal of the second switch is connected to the positive terminal of the second battery; the control terminals of the first, second, third, and fourth switches are all connected to the battery management chip.

[0009] The battery pack includes a first battery and a second battery. The battery pack control circuit includes a first switch, a second switch, a third switch, and a fourth switch. This four-switch control circuit switches the connection state between the two batteries and the battery management chip, with four possible scenarios: 1) the first battery is connected to the battery management chip; 2) the second battery is connected to the battery management chip; 3) the first and second batteries are connected in series and then to the battery management chip; 4) the first and second batteries are connected in parallel and then to the battery management chip. Using four switches to switch the connection state between the two batteries and the battery management chip allows for switching of all connection states between the battery pack and the battery management chip with fewer switches.

[0010] In this implementation, the battery management chip monitors the status parameters of the first and second batteries in real time. Based on these parameters, it controls the connection status between the first and second batteries and the battery management chip via a first, second, third, and fourth switch, thereby controlling the on / off state of the battery pack and the main control board. This improves upon the previous method of using multiple battery management chips to control the on / off state of the battery pack and the main control board, which resulted in poor real-time performance, high cost, low charging efficiency, high power consumption, inability to power on, and complex control processes. It enhances real-time performance and charging efficiency, reduces cost and power consumption, simplifies the control process, and enables the electronic device to power on successfully.

[0011] In one possible implementation of the first aspect, the state parameters of the battery pack include at least one of the following: voltage, current, temperature, and charge.

[0012] In this implementation, by selecting the state parameters of the battery pack, the connection state between the battery pack and the battery management chip is controlled through the battery management chip, thereby controlling the conduction and shutdown of the battery pack and the main control board. This can improve the accuracy of control and thus enhance the real-time performance of the control.

[0013] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the first state parameter of the first battery is detected to be greater than a first threshold or less than a second threshold, the battery management chip disconnects the third switch and the fourth switch, and connects the second battery to the battery management chip; wherein the second threshold is less than the first threshold, and the first state parameter is the voltage or temperature of the first battery.

[0014] The first and second thresholds are voltage thresholds, which can be set according to actual needs. For example, the first threshold can be obtained by statistically analyzing multiple voltages of the first battery when an abnormality occurs, such as the maximum value of multiple voltages under abnormal conditions, or it can be set based on empirical values. Similarly, the second threshold can also be obtained by statistically analyzing multiple voltages of the first battery when an abnormality occurs, such as the minimum value of multiple voltages under abnormal conditions, or it can be set based on empirical values.

[0015] Alternatively, the first and second thresholds can be temperature thresholds, which can be set according to actual needs. For example, the first threshold can be obtained by statistically analyzing multiple temperatures of the first battery when an anomaly occurs, such as the maximum value of multiple temperatures under these conditions, or it can be set based on empirical values. Similarly, the second threshold can also be obtained by statistically analyzing multiple temperatures of the first battery when an anomaly occurs, such as the minimum value of multiple temperatures under these conditions, or it can be set based on empirical values.

[0016] In this implementation, when the first battery is detected to be over-voltage, under-voltage, high-temperature, or low-temperature, it indicates that the first battery has malfunctioned and the connection between the first battery and the battery management chip needs to be disconnected to prevent the first battery from providing abnormal power supply voltage to the main control board through the battery management chip, thereby protecting the main control board.

[0017] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the first state parameter of the first battery is detected to be greater than a third threshold, the battery management chip disconnects the third switch and the fourth switch, and connects the second battery to the battery management chip; wherein, the first state parameter is the current of the first battery.

[0018] The third threshold is the current threshold, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple currents of the first battery when an abnormality occurs, such as calculating the maximum value of multiple currents when the first battery is abnormal; it can also be set based on empirical values.

[0019] In this implementation, when an overcurrent is detected in the first battery, it indicates that the first battery has malfunctioned and the connection between the first battery and the battery management chip needs to be disconnected to prevent the first battery from providing abnormal power supply voltage to the main control board through the battery management chip, thus protecting the main control board.

[0020] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the first state parameter of the first battery is detected to be less than a fourth threshold, the battery management chip disconnects the third switch and the fourth switch and connects the second battery to the battery management chip; wherein, the first state parameter is the charge of the first battery.

[0021] The fourth threshold is the battery level threshold, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple battery levels when the first battery malfunctions, such as calculating the minimum value of multiple battery levels when the first battery malfunctions; it can also be set based on empirical values.

[0022] In this implementation, when the first battery is detected to be low, it indicates that the first battery has malfunctioned and the connection between the first battery and the battery management chip needs to be disconnected to prevent the first battery from providing abnormal power supply voltage to the main control board through the battery management chip, thus protecting the main control board.

[0023] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the second state parameter of the second battery is detected to be greater than a fifth threshold or less than a sixth threshold, the battery management chip disconnects the first switch and the second switch, and connects the first battery to the battery management chip; wherein the sixth threshold is less than the fifth threshold, and the second state parameter is the voltage or temperature of the second battery.

[0024] The fifth and sixth thresholds are voltage thresholds and can be set according to actual needs. For example, the fifth threshold can be obtained by statistically analyzing multiple voltages of the second battery when an anomaly occurs, such as the maximum value of multiple voltages under these conditions; it can also be set based on empirical values. Similarly, the sixth threshold can also be obtained by statistically analyzing multiple voltages of the second battery when an anomaly occurs, such as the minimum value of multiple voltages under these conditions; it can also be set based on empirical values.

[0025] Alternatively, the fifth and sixth thresholds can be temperature thresholds, which can be set according to actual needs. For example, the fifth threshold can be obtained by statistically analyzing multiple temperatures of the second battery when an anomaly occurs, such as calculating the maximum value of multiple temperatures under these conditions; it can also be set based on empirical values. Similarly, the sixth threshold can also be obtained by statistically analyzing multiple temperatures of the second battery when an anomaly occurs, such as calculating the minimum value of multiple temperatures under these conditions; it can also be set based on empirical values.

[0026] In this implementation, when overvoltage, undervoltage, high temperature, or low temperature of the second battery are detected, it indicates that the second battery has malfunctioned and the connection between the second battery and the battery management chip needs to be disconnected to prevent the second battery from providing abnormal power supply voltage to the main control board through the battery management chip, thereby protecting the main control board.

[0027] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the second state parameter of the second battery is detected to be greater than a seventh threshold, the battery management chip disconnects the first switch and the second switch, and connects the first battery to the battery management chip; wherein the second state parameter is the current of the second battery.

[0028] The seventh threshold is the current threshold, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple currents of the second battery when an abnormality occurs, such as calculating the maximum value of multiple currents when the second battery is abnormal; it can also be set based on empirical values.

[0029] In this implementation, when an overcurrent is detected in the second battery, it indicates that the second battery has malfunctioned and the connection between the second battery and the battery management chip needs to be disconnected to prevent the second battery from providing abnormal power supply voltage to the main control board through the battery management chip, thus protecting the main control board.

[0030] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the second state parameter of the second battery is detected to be less than an eighth threshold, the battery management chip disconnects the first switch and the second switch, and connects the first battery to the battery management chip; wherein the second state parameter is the charge of the second battery.

[0031] The eighth threshold is the battery level threshold, which can be set according to actual needs. For example, it can be obtained by counting multiple battery levels when the second battery malfunctions, such as counting the minimum value of multiple battery levels when the second battery malfunctions; or it can be set based on empirical values.

[0032] In this implementation, when the second battery is detected to be low, it indicates that the second battery has malfunctioned and needs to be disconnected from the battery management chip to prevent the second battery from providing abnormal power supply voltage to the main control board through the battery management chip, thus protecting the main control board.

[0033] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the voltage difference between the first battery and the second battery is detected to be greater than a ninth threshold, in response to the received connection information of the external power supply, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit, so that the voltages of the first battery and the second battery are balanced.

[0034] The ninth threshold is the voltage difference threshold between the two batteries, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple voltage differences when the first and second batteries are unbalanced, such as calculating the minimum value of multiple voltage differences when the first and second batteries are unbalanced; it can also be set based on empirical values.

[0035] In this implementation, when the voltage difference between the two batteries is detected to be greater than the ninth threshold, it indicates that the two batteries are unbalanced and the battery with the lower charge needs to be charged to balance the two batteries. This prevents the unbalanced batteries from being unable to be fully charged or fully discharged, which would affect the operation of the battery pack and improve the problem of accelerated aging of unbalanced batteries.

[0036] In one possible implementation of the first aspect, in response to received connection information from an external power source, the battery management chip controls the connection state between the battery pack and the battery management chip via a battery pack control circuit to balance the voltages of the first battery and the second battery. This includes: in response to receiving first connection information from the main control board, the first connection information indicating that the main control board connects to an external power source; when the first battery has a high charge and the second battery has a low charge, the battery management chip closes a second switch and opens a third switch and the fourth switch, connecting the second battery to the battery management chip, and the external power source charges the second battery until the charge difference between the first battery and the second battery is within a first preset range; or, when the first battery has a low charge and the second battery has a high charge, the battery management chip closes a fourth switch and a third switch and opens a first switch and the second switch, connecting the first battery to the battery management chip, and the external power source charges the first battery until the charge difference between the first battery and the second battery is within a first preset range.

[0037] In response to received external power supply connection information, the connection information is used to indicate whether the main control board is connected to an external power supply or not.

[0038] When the main control board is connected to an external power source, the difference in battery power between the two batteries includes two scenarios: 1) the first battery has a high charge and the second battery has a low charge; 2) the first battery has a low charge and the second battery has a high charge. When the first battery has a high charge and the second battery has a low charge, the battery management chip closes the second switch and opens the third and fourth switches, connecting the second battery to the battery management chip. The external power source charges the second battery until the charge difference between the first and second batteries is within a preset range. When the first battery has a low charge and the second battery has a high charge, the battery management chip closes the fourth and third switches and opens the first and second switches, connecting the first battery to the battery management chip. The external power source charges the first battery until the charge difference between the first and second batteries is within a preset range.

[0039] The first preset range is the error range for dual-battery balancing, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple charge difference ranges of the first and second batteries when they are balanced, such as the average or median of multiple charge difference ranges when the first and second batteries are balanced; it can also be set based on empirical values.

[0040] In this implementation, when the main control board is connected to an external power source, charging balancing is performed by closing the corresponding switch to connect the low-power battery to the battery management chip and using the external power source to charge the low-power battery, thereby balancing the two batteries.

[0041] In one possible implementation of the first aspect, in response to received connection information from an external power source, the battery management chip controls the connection state between the battery pack and the battery management chip via a battery pack control circuit to balance the voltages of the first and second batteries. This includes: in response to receiving second connection information from the main control board, the second connection information indicating that the main control board is not connected to the external power source; the battery management chip closes a fourth switch, a second switch, and a third switch, and opens a first switch, connecting the first and second batteries in parallel before connecting them to the battery management chip, so that the higher-capacity battery charges the lower-capacity battery until the capacity difference between the first and second batteries is within a first preset range. When the main control board is not connected to an external power source, the battery management chip controls the connection state between the battery pack and the battery management chip via the battery pack control circuit to balance the voltages of the first and second batteries.

[0042] The first preset range is the error range for dual-battery balancing, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple charge difference ranges of the first and second batteries when they are balanced, such as the mean or median of multiple charge difference ranges when the first and second batteries are balanced; it can also be set based on empirical values.

[0043] In this implementation, when the main control board is not connected to an external power source, discharge balancing is performed. The corresponding switch is closed to connect the two batteries in parallel and then connect them to the battery management chip. The high-capacity battery charges the low-capacity battery, thus balancing the two batteries.

[0044] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the state parameters of the battery pack, including: when the battery pack's charge is less than or equal to the tenth threshold, the battery management chip closes the fourth switch, the second switch, and the third switch, opens the first switch, connects the second battery in parallel with the first battery, and then connects it to the battery management chip.

[0045] The tenth threshold is the battery pack's power threshold, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple battery levels when the battery pack is low, such as calculating the minimum value of multiple battery levels when the battery pack is low; or it can be set based on empirical values.

[0046] In this implementation, when the battery pack has low power, the corresponding switch is closed, which connects the two batteries in the battery pack in parallel and then connects them to the battery management chip, so that the current distribution of each battery is even, thereby extending the service life of the battery pack.

[0047] In one possible implementation of the first aspect, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's state parameters. This includes: in the battery pack's default state, the battery management chip closes the fourth switch and the first switch, and opens the second switch and the third switch, connecting the first battery and the second battery in series before connecting them to the battery management chip. The battery pack's default state refers to the first state parameter of the first battery and the second state parameter of the second battery both being within a preset range.

[0048] The default state of the battery pack refers to the state parameters of each battery in the pack being normal, meaning that the first state parameter of the first battery and the second state parameter of the second battery are both within preset ranges. In this implementation, when the battery pack is functioning normally, the first and second batteries are connected in series and then connected to the battery management chip. This dual-battery series connection method results in high voltage and low current, leading to less heat generation and lower losses in the battery pack, thus achieving high charging efficiency.

[0049] In a second aspect, a battery pack is provided, the battery pack including a battery and a battery management circuit as described in the first aspect and any embodiment thereof, the battery management circuit being used to control the connection state between the battery pack and the battery management chip in the battery management circuit through a battery pack control circuit based on detected battery pack state parameters.

[0050] Thirdly, an electronic device is provided, including a main control board and a battery pack as described in the second aspect and any embodiment thereof. After receiving connection information of an external power source from the main control board, the battery management chip in the battery pack controls the connection state between the battery pack and the battery management chip through the battery pack control circuit in the battery pack, based on the status parameters of the battery pack in the battery pack and the connection information of the external power source.

[0051] The technical effects of the design methods in the second and third aspects can be found in the technical effects of the different design methods in the first aspect, and will not be repeated here. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of a possible structure of an electronic device provided in an embodiment of this application;

[0053] Figure 2 A schematic diagram of the structure of a power management circuit for a related technology provided in the prior art;

[0054] Figure 3 This is a schematic diagram of a battery management circuit provided in an embodiment of this application;

[0055] Figure 4 A schematic diagram of a dual-battery battery management circuit provided in an embodiment of this application;

[0056] Figure 5 A schematic diagram of a dual-battery, four-switch battery management circuit provided in an embodiment of this application;

[0057] Figure 6 This is a schematic diagram of the structure of a battery pack control circuit in a battery management circuit provided in an embodiment of this application;

[0058] Figure 7 A flowchart illustrating the software operation of a battery management circuit provided in this application embodiment;

[0059] Figure 8 This is a flowchart illustrating the identification of application scenarios during the software operation of a battery management circuit, as provided in an embodiment of this application. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. In the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can represent A or B. "And / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple. Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. Meanwhile, in the embodiments of this application, the words "exemplary" or "for example" are used to indicate that something is being used as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding. The terms "coupling" and "connection" involved in the embodiments of this application should be interpreted broadly. For example, it can refer to a physical direct connection or an indirect connection implemented through electronic devices, such as a connection implemented through resistors, inductors, capacitors, or other electronic devices.

[0061] A battery pack typically includes battery modules, a thermal management system, a battery management system (BMS), an electrical system, and structural components. The battery module consists of multiple batteries.

[0062] A battery management system (BMS) is mainly used for intelligent management and maintenance of each battery cell, preventing overcharging and over-discharging, extending battery life, and monitoring battery status.

[0063] A battery management system (BMS) mainly consists of two parts: hardware (including sensors, data acquisition units, control units, etc.) and software.

[0064] The working principle of a battery management system (BMS) is as follows: a series of sensors continuously monitor the key parameters of each battery in the battery pack, including voltage, current, and temperature; the central control unit uses advanced algorithms (such as state estimation algorithms, battery equalization algorithms, and temperature control algorithms) to analyze the collected data (i.e., the key parameters of each individual battery in the battery pack), identify the battery status, and make corresponding decisions based on preset strategies.

[0065] A battery management circuit is a circuit that enables the functions of a battery management system.

[0066] This application provides an electronic device with battery management functionality. The electronic device can be mobile or fixed. It can be deployed on land (e.g., indoors or outdoors, handheld or vehicle-mounted), on water (e.g., on ships), or in the air (e.g., airplanes, balloons, and satellites). This electronic device can be referred to as user equipment (UE), access terminal, terminal unit, subscriber unit, terminal station, mobile station (MS), mobile station, terminal agent, or terminal device. For example, it can be a mobile phone, tablet computer, laptop computer, smart bracelet, smart screen, smartwatch, virtual reality (VR) device, augmented reality (AR) device, terminal in industrial control, terminal in self-driving, terminal in remote medical care, terminal in smart grid, terminal in transportation safety, terminal in smart city, terminal in smart home, etc. This application does not limit the specific type and structure of the electronic device. The following describes one possible structure of the electronic device.

[0067] Taking mobile phones as an example, the attached document... Figure 1A possible structure of an electronic device 100 is shown. This electronic device 100 may include a processor 210, an external memory interface 220, an internal memory 221, a universal serial bus (USB) interface 230, a power management module 240, a battery pack 1, a battery group 2, a battery management circuit 5, a wireless charging coil 242, a mobile communication module 250, a wireless communication module 260, antennas 251 and 261, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, a headphone jack 270D, a sensor module 280, buttons 290, a motor 291, an indicator 292, a camera 293, a display screen 294, and a subscriber identification module (SIM) card interface 295, etc. Optionally, in some embodiments, it may also include an audio digital signal processor (ADSP) 243.

[0068] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0069] Processor 210 may include one or more processing units, such as: a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system-on-chip (SoC), a central processing unit (CPU), an application processor (AP), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, and a neural network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors. For example, processor 210 may be an application processor (AP). Alternatively, processor 210 may be integrated into a system-on-chip (SoC). Or, processor 210 may be integrated into an integrated circuit (IC) chip. The processor 210 may include an analog front end (AFE) and a micro-controller unit (MCU) in an IC chip.

[0070] The processor 210 can be located on the main control board provided in the embodiments of this application.

[0071] The processor 210 may also include a memory for storing computer instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. This memory can store computer instructions or data that the processor 210 has just used or that are being used repeatedly. If the processor 210 needs to use the same computer instructions or data again, it can retrieve them directly from the memory. This avoids repeated accesses, reduces the waiting time of the processor 210, and thus improves system efficiency.

[0072] In some embodiments, the processor 210 may include one or more interfaces. These interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a USB interface, etc.

[0073] The ADSP 243 can be coupled to the audio module 270 and the sensor module 280. The ADSP 243 can process audio signals and sensor data. Even when the processor is in sleep mode, the ADSP 243 can remain operational, thereby reducing the power consumption of the electronic device.

[0074] It is understood that the interface connection relationships between the modules illustrated in the embodiments of this application are merely illustrative and do not constitute a structural limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may also employ different interface connection methods or a combination of multiple interface connection methods.

[0075] The external storage interface 220 can be used to connect an external memory card, such as a micro SanDisk (Micro SD) card, to expand the storage capacity of the electronic device 100. The external memory card communicates with the processor 210 through the external storage interface 220 to perform data storage functions. For example, music, video, and other files can be stored on the external memory card.

[0076] Internal memory 221 can be used to store computer executable program code, which includes computer instructions. Processor 210 executes various functional applications and data processing of electronic device 100 by running the computer instructions stored in internal memory 221. In addition, internal memory 221 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc.

[0077] The memory involved in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0078] Electronic device 100 can implement audio functions such as music playback and recording through audio module 270, speaker 270A, receiver 270B, microphone 270C, headphone jack 270D, and application processor.

[0079] Buttons 290 include power buttons, volume buttons, etc. Buttons 290 can be mechanical buttons or touch buttons. Electronic device 100 can receive button inputs and generate key signal inputs related to user settings and function control of electronic device 100. Motor 291 can generate vibration alerts. Motor 291 can be used for incoming call vibration alerts or for touch vibration feedback. Indicator 292 can be an indicator light, used to indicate charging status, battery level changes, or to indicate messages, missed calls, notifications, etc. SIM card interface 295 is used to connect a SIM card. The SIM card can be inserted into or removed from the SIM card interface 295 to achieve contact and separation with electronic device 100. Electronic device 100 can support one or N SIM card interfaces, where N is a positive integer greater than 1. SIM card interface 295 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. In some embodiments, the electronic device 100 employs an embedded SIM (eSIM) card, which can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

[0080] The electronic device 100 can implement its shooting function through an ISP, a camera 293, a video codec, a GPU, a display 294, and an application processor. The ISP is used to process data fed back from the camera 293. In some embodiments, the ISP can be located within the camera 293. The camera 293 is used to capture still images or videos. In some embodiments, the electronic device 100 may include one or N cameras 293, where N is a positive integer greater than 1.

[0081] Electronic device 100 can implement display functions through a GPU, display screen 294, and application processor. The GPU is a microprocessor for image processing, connected to the display screen 294 and the application processor. The GPU is used to perform mathematical and geometric calculations and for graphics rendering. Processor 210 may include one or more GPUs, which execute computer instructions to generate or modify display information.

[0082] In this embodiment, the battery pack 1 includes a battery management circuit 5 and a battery group 2. The battery group 2 may include one or more batteries to supply power to the load. The battery management circuit 5 includes a battery management chip and a battery group control circuit. The battery management chip can also be used to detect parameters such as the capacity, voltage, current, battery cycle count, and battery health status (leakage current, impedance) of the battery group 2. Based on the detected status parameters of the battery group 2, the battery management chip can control the connection status between the battery group 2 and the battery management chip through the battery group control circuit.

[0083] The power management module 240 can be installed on the main control board provided in the embodiments of this application.

[0084] The power management module 240 is used to receive charging input from a charger. The charger can be a wireless charger, such as a wireless charging dock, or other electronic device 100 with reverse wireless charging capability. The power management module 240 can receive wireless charging input via the wireless charging coil 242 of the electronic device. The charger can also be a wired charger; for example, the power management module 240 can receive charging input from a wired charger via a USB interface 230. The power management module 240 is also referred to as a charging chip.

[0085] In this embodiment, the power management module 240 includes a power management chip. This chip can charge the battery pack 2 via the battery management circuit 5 and also supply power to the electronic device 100. The power management module 240 receives input from the battery pack 1 and supplies power to the processor 210, internal memory 221, external memory interface 220, display screen 294, camera 293, and wireless communication module 260 on the main control board.

[0086] The wireless communication function of the electronic device 100 can be realized through antenna 251, antenna 261, mobile communication module 250, wireless communication module 260, modem processor, etc.

[0087] Mobile communication module 250 can provide wireless communication solutions including 2G / 3G / 4G / 5G for use on electronic device 100. Wireless communication module 260 can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) for use on electronic device 100.

[0088] In related technologies, such as the attached Figure 2 As shown, the battery pack 1 includes a battery group 2, a battery management chip 3, and a battery group control circuit 4. The battery group 2 includes a first battery 21 and a second battery 22. The battery management chip 3 is a dual-chip battery management chip, including a battery management chip 31 and a battery management chip 32. Correspondingly, the battery group control circuit 4 includes a battery group control circuit 41 and a battery group control circuit 42.

[0089] The positive terminal of the first battery 21 is connected to the second terminal of the battery pack control circuit 41, and the first terminal of the battery pack control circuit 41 is connected to the second terminal of the battery management chip 31. The positive terminal of the second battery 22 is connected to the second terminal of the battery pack control circuit 42, and the first terminal of the battery pack control circuit 42 is connected to the second terminal of the battery management chip 32. The negative terminal of the first battery 21 is connected to the negative terminal of the second battery 22. Both battery management chips 31 and 32 are connected to the power management chip 6 on the main control board 7, and communicate with each other.

[0090] Battery management chip 31 monitors the status parameters of the first battery 21 in real time and controls the connection status between the first battery 21 and battery management chip 31 through battery pack control circuit 41 based on the status parameters of the first battery 21. Similarly, battery management chip 32 monitors the status parameters of the second battery 22 in real time and controls the connection status between the second battery 22 and battery management chip 32 through battery pack control circuit 42. Power management chip 6 controls the connection status between the first battery 21, the second battery 22 and battery management chip 31 and battery management chip 32 respectively through battery management chip 31 and battery management chip 32, thereby controlling the on and off states of battery pack 2 (first battery 21, second battery 22) and main control board 7.

[0091] In related technologies, on the one hand, using two battery management chips 3 to operate independently and control the connection status of the two batteries with their respective battery management chips 3 not only increases the cost of the chips, leading to higher overall costs, but also requires two independent control schemes during the separate control process, making the control process more complex. Furthermore, due to limitations in the circuit connection structure, the battery pack 2 and the main control board 7 can only be switched on and off in three ways: 1) only the first battery 21 is switched on with the main control board 7; 2) only the second battery 22 is switched on with the main control board 7; 3) the first battery 21 and the second battery 22 are connected in parallel and then switched on with the main control board 7. When the main control board 7 is connected to an external power source, it controls the battery pack 2 to be in a charging state. Due to the limitations of this circuit connection structure, it is impossible to control the first battery 21 and the second battery 22 to be connected in series; it can only control the dual batteries to charge in parallel, resulting in a single charging mode and low charging efficiency.

[0092] On the other hand, the battery management chip 31 and the battery management chip 32 operate independently. During the process of controlling the battery pack 2 and the main control board 7 to turn on and off, there will be time difference and control asynchrony, resulting in poor real-time performance.

[0093] Furthermore, asynchronous control can also cause problems such as the battery management chip 3 being unable to enter low-power mode, resulting in high power consumption, and electronic devices 100 failing to power on.

[0094] The low-power modes of the battery management chip 3 include a sleep mode and a full sleep mode. Whether entering sleep mode or full sleep mode, the battery management chip 3 needs to disconnect the battery pack 2 from the main control board 7. In sleep mode, the battery management chip 3 is powered off. At this time, some services need to be reduced to decrease the power consumption of the battery management chip 3. After a first preset time in sleep mode, the battery management chip 3 automatically transitions from sleep mode to full sleep mode. In full sleep mode, the battery management chip 3 is in a long-term sleep state. During this time, except for responding to interrupts, all periodic services are stopped, such as monitoring battery status and stopping battery power-related algorithms, to further reduce the power consumption of the battery management chip 3. The first preset time can be obtained by statistically analyzing the duration of full sleep mode for multiple electronic devices or the current electronic device, such as by calculating the average or median of multiple full sleep mode durations; it can also be set according to actual needs, such as based on empirical values, for example, a first preset time of 5 days. Therefore, battery management chip 3 entering low-power mode means that battery management chip 3 enters sleep mode or complete sleep mode, and battery management chip 3 disconnects the battery pack 2 from the main control board 7. Battery management chip 3 cannot enter low-power mode; in other words, it cannot enter sleep mode or complete sleep mode.

[0095] When entering full sleep mode, for example, in response to the complete shutdown of electronic device 100, it is necessary to synchronously control the disconnection of the first battery 21 and the second battery 22 from the main control board 7. Due to asynchronous control, the connection between the first battery 21 and the second battery 22 and the battery management chip 3 cannot be synchronously disconnected, thereby disconnecting the battery pack 2 from the main control board 7. Assuming that in response to the complete shutdown of electronic device 100, the battery management chip 31 first disconnects from the first battery 21, and then the power management chip 6 detects the power supply status of the main control board 7, since the battery management chip 32 has not yet disconnected from the second battery 22, when it detects that the second battery 22 connected to the battery management chip 32 is supplying power to the main control board 7, that is, when it detects that the main control board 7 is still in a power supply state, the power management chip 6 will send a control command to the battery management chip 31 instructing it to reconnect with the first battery 21. After receiving the control command, the battery management chip 31 will forcibly reconnect with the first battery 21, causing the process of disconnecting from the first battery 21 to fail, and the battery management chip 31 will not be able to enter full sleep mode. Similar to battery management chip 31, battery management chip 32 first disconnects from the second battery 22 and then reconnects to it, thus preventing battery management chip 32 from entering a complete sleep mode. Therefore, battery management chip 32 cannot enter a low-power mode, resulting in high power consumption.

[0096] When entering sleep mode, for example, after detecting that both the first battery 21 and the second battery 22 are at low power, in response to the low power of both batteries, the connection between the first battery 21 and the second battery 22 and the main control board 7 needs to be simultaneously disconnected. Due to asynchronous control, as described above, the battery management chip 31 first disconnects from the first battery 21 and then reconnects to the second battery 22, and so on. Similarly, the battery management chip 3 cannot enter low power mode, resulting in high power consumption.

[0097] For electronic device 100 to successfully power on, it needs to simultaneously establish connections with both the first battery 21 and the second battery 22, thereby synchronously establishing connections between the first battery 21 and the main control board 7, and between the second battery 22 and the main control board 7. Asynchronous control will prevent electronic device 100 from powering on. For example, if battery management chip 3 fails to synchronously establish connections between the first battery 21 and the main control board 7, and between the second battery 22 and the main control board 7, then electronic device 100 will not power on.

[0098] Therefore, this application provides a battery management circuit 5. Based on the battery management circuit 5 provided in this application, a battery management chip 3 can be used to control the connection state between the battery pack 2 and the battery management chip 3, thereby controlling the on and off states of the battery pack 2 and the main control board 7.

[0099] The battery management circuit 5 provided in this application embodiment uses only one battery management chip 3 to control the connection state between the battery pack 2 and the battery management chip 3, resulting in low cost; it requires only one control scheme, making the control process simple; when the main control board 7 is connected to an external power source, it can control multiple batteries in the battery pack 2 to be connected in series for charging, improving charging efficiency; one battery management chip 3 can synchronously control the connection state between multiple batteries and the battery management chip 3, providing good real-time control; due to synchronous control, it can synchronously control the disconnection of multiple batteries from the battery management chip 3, allowing the battery management chip 3 to enter a low-power mode and reducing power consumption; due to synchronous control, it can synchronously control the connection between multiple batteries and the battery management chip 3, enabling the electronic device 100 to successfully power on.

[0100] Therefore, the battery management circuit 5 provided in this application embodiment improves the problems of poor real-time performance, high cost, low charging efficiency, high power consumption, complex control process and inability of electronic device 100 to power on, which are caused by controlling the conduction and shutdown of battery pack 2 and main control board 7 through multiple battery management chips 3. It improves real-time performance and charging efficiency, reduces cost, reduces power consumption, simplifies the control process, and enables electronic device 100 to power on successfully.

[0101] The battery management circuit 5 provided in this application embodiment can be the battery management circuit 5 in the battery pack 1 of the electronic device 100. The battery pack 1 can be the battery pack 1 in the electronic device 100, the battery group 2 can be the battery group 2 in the battery pack 1, the main control board 7 can be the main control board including the processor 210 and the power management module 240 in the electronic device 100, and the power management chip 6 can be the power management chip in the power management module 240.

[0102] For example, see attached Figure 3 As shown, the battery management circuit 5 is mounted on the battery pack 1, and the battery management circuit 5 includes a battery management chip 3 and a battery pack control circuit 4.

[0103] The battery management chip 3 monitors the status parameters of the battery pack 2 in the battery pack 1 in real time. Based on the status parameters of the battery pack 2, the battery management chip 3 controls the connection status between the battery pack 2 and the battery management chip 3 through the battery pack control circuit 4.

[0104] In one possible implementation, battery pack 2 includes n batteries, where n>=2. The embodiments of this application do not limit the number of batteries.

[0105] In one possible implementation, the battery pack control circuit 4 includes m switches, where m >= n. The embodiments of this application do not limit the number of switches.

[0106] In one possible implementation, the connection state between the battery pack 2 and the battery management chip 3 can be a single battery connected to the battery management chip 3, or at least two batteries connected in series or parallel to the battery management chip 3. This application embodiment does not limit the connection state between the battery pack 2 and the battery management chip 3.

[0107] In one possible implementation, the state parameters of battery pack 2 may include at least one of the following information: voltage, current, temperature and charge. The specific information of the state parameters of battery pack 2 is not limited in the embodiments of this application.

[0108] Both the battery management circuit 5 and the battery pack 2 are mounted on the battery pack 1. The battery management chip 3 in the battery management circuit 5 monitors the status parameters of the battery pack 2 in real time. Based on these parameters, the battery pack control circuit 4 in the battery management circuit 5 controls the connection between the battery pack 2 and the battery management chip 3, thereby controlling the on / off state of the battery pack 2 and the main control board 7. This improves upon the previous method of using multiple battery management chips 3 to control the on / off state of the battery pack 2 and the main control board 7, which resulted in poor real-time performance, high cost, low charging efficiency, high power consumption, complex control process, and the inability to power on the electronic device 100. The new method improves real-time performance and charging efficiency, reduces cost and power consumption, simplifies the control process, and enables the electronic device 100 to power on successfully.

[0109] The working principle of the battery management circuit 5 is as follows:

[0110] A battery management circuit 5, including a battery management chip 3 and a battery pack control circuit 4, is installed in the battery pack 1. A battery management chip 3 is used to detect the status parameters of the battery pack 2 in real time, and according to the status parameters of the battery pack 2, the battery pack control circuit 4 controls the connection status between the battery pack 2 and the battery management chip 3, thereby controlling the conduction and shutdown of the battery pack 2 and the main control board 7.

[0111] The battery management circuit 5 provided in this application embodiment includes a battery management chip 3. The battery management chip 3 controls the connection state between the battery pack 2 and the battery management chip 3, thereby controlling the conduction and shutdown of the battery pack 2 and the main control board 7. Therefore, it improves the problems of poor real-time performance, high cost, low charging efficiency, high power consumption, complex control process, and failure of electronic device 100 to power on, which are caused by controlling the conduction and shutdown of the battery pack 2 and the main control board 7 through multiple battery management chips 3. It improves real-time performance and charging efficiency, reduces cost, reduces power consumption, simplifies the control process, and enables electronic device 100 to power on successfully.

[0112] In the following embodiments of this application, the circuit structure of the battery management circuit 5 of this application is specifically described using the battery pack 2, which includes a first battery 21 and a second battery 22, as an example.

[0113] For example, see attached Figure 4 As shown, corresponding to the single-chip battery management chip 3, there is only one battery pack control circuit 4. The positive terminal of the first battery 21 is connected to the second terminal of the battery pack control circuit 4, and the first terminal of the battery pack control circuit 4 is connected to the second terminal of the battery management chip 3. The positive terminal of the second battery 22 is connected to the second terminal of the battery pack control circuit 4, and the first terminal of the battery pack control circuit 4 is connected to the second terminal of the battery management chip 3.

[0114] The working principle of the battery management circuit 5 that controls the dual batteries is as follows:

[0115] The battery management chip 3 detects the status parameters of the first battery 21 and the second battery 22 in real time, and controls the connection status of the first battery 21 and the second battery 22 with the battery management chip 3 through the battery pack control circuit 4 based on the status parameters of the first battery 21 and the second battery 22, thereby controlling the conduction and shutdown of the first battery 21 and the main control board 7.

[0116] The single-chip battery management chip 3 implements dual-channel status parameter acquisition in hardware to manage two batteries and monitor their connection status. This enables accurate acquisition of status parameters and improves the real-time performance, high cost, low charging efficiency, high power consumption, complex control process, and inability of electronic device 100 to power on, which are caused by multiple battery management chips 3 controlling the conduction and shutdown of battery pack 2 and main control board 7.

[0117] In the following embodiments of this application, the battery pack control circuit 4, including a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4, is used as an example to specifically describe the circuit structure of the battery management circuit 5, which includes a single-chip battery management chip 3.

[0118] For example, see attached Figure 5 As shown, the first terminal of the fourth switch S4 is connected to the battery management chip 3, and the second terminal of the fourth switch S4 is connected to the positive terminal of the first battery 21; the negative terminal of the first battery 21 is connected to the first terminal of the first switch S1, and the second terminal of the first switch S1 is connected to the positive terminal of the second battery 22; the negative terminal of the first battery 21 is connected to the first terminal of the third switch S3, and the second terminal of the third switch S3 is connected to the negative terminal of the second battery 22; the first terminal of the fourth switch S4 is connected to the first terminal of the second switch S2, and the second terminal of the second switch S2 is connected to the positive terminal of the second battery 22; the control terminals of the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all connected to the battery management chip 3.

[0119] In this embodiment, the battery management chip 3 uses a battery pack control circuit 4 with four switches (first switch S1, second switch S2, third switch S3 and fourth switch S4) to switch the connection state of the two batteries (first battery 21 and second battery 22) with the battery management chip 3.

[0120] The battery pack control circuit 4, which uses four switches, switches the connection state of the two batteries 2 and the battery management chip 3, and there are four scenarios: 1) the first battery 21 is connected to the battery management chip 3; 2) the second battery 22 is connected to the battery management chip 3; 3) the first battery 21 and the second battery 22 are connected in series and then connected to the battery management chip 3; 4) the first battery 21 and the second battery 22 are connected in parallel and then connected to the battery management chip 3.

[0121] For example, see attached Figure 6 As shown, the working principles corresponding to these four scenarios are as follows:

[0122] 1) See Appendix Figure 6As shown in (a), when the fourth switch S4 and the third switch S3 are closed, and the first switch S1 and the second switch S2 are open, the first battery 21 is connected to the battery management chip 3.

[0123] 2) See Appendix Figure 6 (b) and appendix Figure 6 As shown in (c), when the fourth switch S4 and the third switch S3 are open and the second switch S2 is closed, the second battery 22 is connected to the battery management chip 3.

[0124] 3) See Appendix Figure 6 As shown in (d), when the fourth switch S4 and the first switch S1 are closed, and the third switch S3 and the second switch S2 are open, the first battery 21 and the second battery 22 are connected in series and then connected to the battery management chip 3.

[0125] 4) See Appendix Figure 6 As shown in (e), when the fourth switch S4, the third switch S3, and the second switch S2 are closed and the first switch S1 is open, the first battery 21 and the second battery 22 are connected in parallel and then connected to the battery management chip 3.

[0126] As can be seen from the above four scenarios, the battery management circuit 5, including the battery management chip 3 and the battery pack control circuit 4, supports independent charging and discharging of any one battery, parallel charging and discharging of the two batteries, and series charging and discharging of the two batteries when controlling the dual batteries.

[0127] The battery management chip 3 monitors the status parameters of the first battery 21 and the second battery 22 in real time. Based on these parameters, it controls the connection status between the first battery 21, the second battery 22, and the battery management chip 3 via the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4. This, in turn, controls the connection between the battery pack 2 and the main control board 7. This improves upon the previous method of using multiple battery management chips 3 to control the connection between the battery pack 2 and the main control board 7, which resulted in poor real-time performance, high cost, low charging efficiency, high power consumption, complex control processes, and the inability to power on the electronic device 100. It enhances real-time performance and charging efficiency, reduces cost and power consumption, simplifies the control process, and enables the electronic device 100 to power on successfully.

[0128] In this embodiment, the electronic device 100 includes a main control board 7, which includes a power management chip 6 and a processor. The power management chip 6 is connected to the processor, and the battery management chip 3 can also communicate with the power management chip 6.

[0129] For example, see Appendix Figure 2 - Appendix Figure 4The battery management chip 3 detects the status parameters of the battery pack 2 and sends the status parameters of the battery pack 2 to the power management chip 6. The power management chip 6 generates a first control command based on the status parameters of the battery pack 2 and sends it to the battery management chip 3. The battery management chip 3 receives the first control command and controls the current magnitude when the battery pack 2 is connected to the main control board 7 according to the first control command. The first control command is used to indicate the current magnitude when the battery pack 2 is connected to the main control board 7.

[0130] In one possible implementation, the power management chip 6 can also send the status parameters of the battery pack 2 to the processor on the main control board 7. After receiving the status parameters of the battery pack 2, the processor calculates the status parameters, generates a second control command, and sends it to the power management chip 6. After receiving the second control command, the power management chip 6 generates a first control command based on the second control command and sends it to the battery management chip 3. The battery management chip 3 receives the first control command and controls the current magnitude when the battery pack 2 is connected to the main control board 7; wherein, the first control command is used to indicate the current magnitude when the battery pack 2 is connected to the main control board 7. This application does not limit the specific control method.

[0131] The above description introduces the hardware circuit structure of the battery management circuit 5 provided in the embodiments of this application. The following is an exemplary description of the software operation flow of the battery management chip 3 provided in the embodiments of this application.

[0132] For example, see Appendix Figure 7 The operation process may include steps S701-S709:

[0133] Step S701: Battery management chip 3 initializes the system.

[0134] The battery management chip initialization system typically includes power-on, initializing hardware devices such as the clock module and analog-to-digital converter, and calibrating the clock, among other preparatory work.

[0135] In step S702, the battery management chip 3 monitors the status of the battery pack 2.

[0136] The battery management chip 3 monitors the status of the battery pack 2 by detecting the status parameters of the first battery 21 and the second battery 22 in real time.

[0137] Similarly, in one possible implementation, the state parameters of the first battery 21 and the second battery 22 may include at least one of the following information: voltage, current, temperature and charge. The specific information of the state parameters of the first battery 21 and the second battery 22 is not limited in the embodiments of this application.

[0138] In step S703, the battery management chip 3 performs data processing.

[0139] Data processing refers to calculating the state parameters of battery pack 2 in its current connection state. For example, if the first battery 21 and the second battery 22 are connected in series, the voltage of the first battery 21 is added to the voltage of the second battery 22. As another example, if the first battery 21 and the second battery 22 are connected in parallel, the current of the first battery 21 is added to the current of the second battery 22.

[0140] In step S704, the battery management chip 3 performs battery malfunction protection.

[0141] The battery management chip 3 detects the status parameters of the first battery 21 and the second battery 22 respectively. If the status parameters of the first battery 21 and / or the second battery 22 are abnormal, the corresponding battery abnormality protection is triggered.

[0142] Step S705: Battery management chip 3 sets the status of battery pack 2.

[0143] After the battery protection is triggered, the connection status between the corresponding battery pack 2 and the battery management chip 3 is set by the switch in the battery pack control circuit 4 according to the corresponding battery abnormality protection strategy.

[0144] In step S706, the battery management chip 3 calculates the battery level.

[0145] Power calculation refers to the battery management chip 3 detecting the power of the first battery 21 and the second battery 22 respectively, and calculating the sum of the power of the first battery 21 and the second battery 22.

[0146] In step S707, the battery management chip 3 determines whether charge-discharge balancing is required.

[0147] The battery management chip 3 detects the voltage of the first battery 21 and the second battery 22 respectively. If the voltage difference between the two batteries is greater than a preset threshold, charge-discharge balancing is required. Otherwise, charge-discharge balancing is not required, and the process returns to the second step.

[0148] In step S708, the battery management chip 3 performs charge-discharge balancing.

[0149] When charge-discharge balancing is required, perform charge-discharge balancing.

[0150] Step S709, charge balancing and discharge balancing.

[0151] Charging and discharging balancing includes charging balancing and discharging balancing. Charging balancing refers to charging batteries with low charge levels using an external power source to achieve balance. Discharging balancing refers to discharging batteries with high charge levels to achieve balance.

[0152] In the above operation process, after the battery management chip 3 collects the status parameters of the two batteries (first battery 21 and second battery 22), it can identify the application scenario.

[0153] In this embodiment of the application, a dual-battery configuration is used as an example to illustrate the specific application scenarios identified in this application.

[0154] For example, see the appendix. Figure 8 The process of identifying application scenarios may include steps S801-S805:

[0155] Step S801: Battery management chip 3 collects the status parameters of the dual batteries.

[0156] Battery management chip 3 collects the status parameters of the two batteries. For example, at time t1, it collects the voltage v1 and current i1 of the first battery 21, and at time t2, it collects the voltage v2 and current i2 of the second battery 22.

[0157] In step S802, the battery management chip 3 determines whether to perform battery abnormality protection. Battery abnormality protection means that when an abnormal state parameter of any battery in the battery pack 2 is detected, the protection function is triggered, and the connection between the corresponding battery and the battery management chip 3 is disconnected through the switch in the battery pack control circuit 4.

[0158] Battery anomaly protection includes single-cell protection or simultaneous dual-cell protection. Battery anomalies include several common abnormal conditions, such as overvoltage, undervoltage, high temperature, low temperature, overcurrent, and low charge, which are not limited in the embodiments of this application.

[0159] Battery malfunctions generally fall into three categories: 1) The first battery 21 malfunctions; 2) The second battery 22 malfunctions; 3) Both the first battery 21 and the second battery 22 malfunction.

[0160] In this embodiment, the specific battery fault protection process, in conjunction with the power management circuit 5 described above, is as follows:

[0161] 1) The first battery 21 is malfunctioning.

[0162] When the first battery 21 experiences overvoltage, undervoltage, high temperature, or low temperature abnormalities—in other words, when the voltage or temperature of the first battery 21 is detected to be greater than a first threshold or less than a second threshold—the battery management chip 3 disconnects the third switch S3 and the fourth switch S4, disconnecting the first battery 21 from the battery management chip 3 and connecting the second battery 22 to the battery management chip 3. The second threshold is less than the first threshold.

[0163] The first and second thresholds are voltage thresholds, which can be set according to actual needs. For example, the first threshold can be obtained by statistically analyzing multiple voltages of the first battery 21 when an abnormality occurs, such as the maximum value of multiple voltages when the first battery 21 is abnormal; it can also be set based on empirical values. Similarly, the second threshold can also be obtained by statistically analyzing multiple voltages of the first battery 21 when an abnormality occurs, such as the minimum value of multiple voltages when the first battery 21 is abnormal; it can also be set based on empirical values.

[0164] Alternatively, the first and second thresholds can be temperature thresholds, which can be set according to actual needs. For example, the first threshold can be obtained by statistically analyzing multiple temperatures of the first battery when an anomaly occurs, such as the maximum value of multiple temperatures when the first battery is abnormal, or it can be set based on empirical values. Similarly, the second threshold can also be obtained by statistically analyzing multiple temperatures of the first battery 21 when an anomaly occurs, such as the minimum value of multiple temperatures when the first battery 21 is abnormal, or it can be set based on empirical values.

[0165] When the first battery 21 experiences an overcurrent abnormality, in other words, when the current of the first battery 21 is detected to be greater than the third threshold, the management chip 3 disconnects the third switch S3 and the fourth switch S4, disconnects the first battery 21 from the battery management chip 3, and connects the second battery 22 to the battery management chip 3.

[0166] The third threshold is a current threshold, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple currents of the first battery 21 when an abnormality occurs, such as calculating the maximum value of multiple currents when the first battery 21 is abnormal; it can also be set based on empirical values.

[0167] When the first battery 21 experiences a low power abnormality, in other words, when the power of the first battery 21 is detected to be less than the fourth threshold, the management chip 3 disconnects the third switch S3 and the fourth switch S4, disconnects the first battery 21 from the battery management chip 3, and connects the second battery 22 to the battery management chip 3.

[0168] The fourth threshold is the battery level threshold, which can be set according to actual needs. For example, it can be obtained by counting multiple battery levels of the first battery 21 when an abnormality occurs, such as counting the minimum value of multiple battery levels when the first battery 21 is abnormal; it can also be set based on empirical values.

[0169] When the first battery 21 is detected to have overvoltage, undervoltage, high temperature, low temperature, overcurrent, or low charge, it indicates that the first battery 21 has malfunctioned and the connection between the first battery 21 and the battery management chip 3 needs to be disconnected to prevent the first battery 21 from providing abnormal power supply voltage to the main control board 7 through the battery management chip 3, so as to protect the main control board 7.

[0170] 2) The second battery 22 is malfunctioning.

[0171] When the second battery 22 experiences overvoltage, undervoltage, high temperature, or low temperature abnormalities—in other words, when the voltage or temperature of the second battery 22 is detected to be greater than the fifth threshold or less than the sixth threshold—the management chip 3 disconnects the first switch S1 and the second switch S2, disconnecting the second battery 22 from the battery management chip 3 and connecting the first battery 21 to the battery management chip 3. The fifth threshold is less than the sixth threshold.

[0172] The fifth and sixth thresholds are voltage thresholds and can be set according to actual needs. For example, the fifth threshold can be obtained by statistically analyzing multiple voltages of the second battery 22 when an abnormality occurs, such as the maximum value of multiple voltages when the second battery 22 is abnormal; it can also be set based on empirical values. Similarly, the sixth threshold can also be obtained by statistically analyzing multiple voltages of the second battery 22 when an abnormality occurs, such as the minimum value of multiple voltages when the second battery 22 is abnormal; it can also be set based on empirical values.

[0173] Alternatively, the fifth and sixth thresholds can be temperature thresholds, which can be set according to actual needs. For example, the fifth threshold can be obtained by statistically analyzing multiple temperatures of the second battery when an anomaly occurs, such as the maximum value of multiple temperatures when the second battery is abnormal; it can also be set based on empirical values. Similarly, the sixth threshold can also be obtained by statistically analyzing multiple temperatures of the second battery 22 when an anomaly occurs, such as the minimum value of multiple temperatures when the second battery 22 is abnormal; it can also be set based on empirical values.

[0174] When the second battery 22 experiences an overcurrent abnormality, in other words, when the current of the second battery 22 is detected to be greater than the seventh threshold, the management chip 3 disconnects the first switch S1 and the second switch S2, disconnects the second battery 22 from the battery management chip 3, and connects the first battery 21 to the battery management chip 3.

[0175] The seventh threshold is a current threshold, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple currents of the second battery 22 when an abnormality occurs, such as calculating the maximum value of multiple currents when the second battery 22 is abnormal; it can also be set based on empirical values.

[0176] When the second battery 22 experiences a low power abnormality, in other words, when the power of the second battery 22 is detected to be less than the eighth threshold, the management chip 3 disconnects the first switch S1 and the second switch S2, disconnects the second battery 22 from the battery management chip 3, and connects the first battery 21 to the battery management chip 3.

[0177] The eighth threshold is a power threshold, which can be set according to actual needs. For example, it can be obtained by counting multiple power levels of the second battery 22 when an abnormality occurs, such as counting the minimum power level of the second battery 22 when an abnormality occurs; it can also be set based on empirical values.

[0178] When the second battery 22 is detected to have overvoltage, undervoltage, high temperature, low temperature, overcurrent, or low charge, it indicates that the second battery 22 has malfunctioned and needs to be disconnected from the battery management chip 3 to prevent the second battery 22 from providing abnormal power supply voltage to the main control board 7 through the battery management chip 3, thereby protecting the main control board 7.

[0179] As can be seen from the first type of battery malfunction (the first battery 21 malfunctions) and the second type of battery malfunction (the second battery 22 malfunctions), these two battery malfunctions are single-battery malfunctions. In this case, it is necessary to disconnect the connection between the malfunctioning battery and the battery management chip 3. That is, the battery pack 2 disconnects 1 / 2 of the batteries to prevent the malfunctioning battery from providing abnormal power supply voltage to the main control board 7 through the battery management chip 3, so as to protect the main control board 7.

[0180] 3) Both the first battery 21 and the second battery 22 are malfunctioning.

[0181] If both the first battery 21 and the second battery 22 malfunction, the connection between the first battery 21 and the second battery 22 and the battery management chip 3 needs to be disconnected simultaneously. At this time, the battery pack 2 will no longer work. This situation is not common, and this embodiment will not describe it in detail here. The specific process of the fault protection when both the first battery 21 and the second battery 22 malfunction is as described in section 1) when the first battery 21 malfunctions and section 2) when the second battery 22 malfunctions, and will not be repeated here.

[0182] The three abnormal protection processes described above require disconnecting the first battery 21 and / or the second battery 22 from the battery management chip 3 when an abnormality is detected in the first battery 21 and / or the second battery 22, in order to prevent the first battery 21 and / or the second battery 22 from providing abnormal power supply voltage to the main control board 7 through the battery management chip 3, thereby protecting the main control board 7.

[0183] In step S803, the battery management chip 3 determines whether to perform charge / discharge balancing. This determination requires balancing the two batteries. Balance detection involves checking the state parameters of each battery (first battery 21 and second battery 22) to determine if they are balanced. Since battery balance is fundamental for safe battery operation, charge / discharge balancing is necessary when the batteries are unbalanced. In other words, if the need for charge / discharge balancing is detected, it can be performed as needed.

[0184] In this embodiment of the application, the specific charge-discharge balancing process is as follows:

[0185] When the voltage difference between the first battery 21 and the second battery 22 is detected to be greater than the ninth threshold, in response to the received external power supply connection information, the battery management chip 3 controls the connection state between the battery pack 2 and the battery management chip through the battery pack control circuit 4, so that the voltage of the first battery 21 and the second battery 22 is balanced.

[0186] The ninth threshold is the voltage difference threshold between the two batteries, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple voltage differences between the first battery 21 and the second battery 22 when imbalance occurs, such as calculating the minimum value of multiple voltage differences when imbalance occurs between the first battery 21 and the second battery 22; it can also be set based on empirical values.

[0187] When the voltage difference between the first battery 21 and the second battery 22 is detected to be greater than the ninth threshold, it indicates that the first battery 21 and the second battery 22 are unbalanced. It is necessary to charge and discharge the battery with low power to balance the first battery 21 and the second battery 22, so as to avoid the unbalanced battery from not being able to be fully charged or fully discharged, affecting the operation of the battery pack 2, and improving the problem of accelerated aging of unbalanced batteries.

[0188] The response to the received external power supply connection information refers to the battery management chip 3 receiving the connection information from the main control board 7 indicating that the main control board 7 is connected to the external power supply or that the main control board 7 is not connected to the external power supply.

[0189] With the main control board 7 connected to an external power source:

[0190] If the first battery 21 has a high charge and the second battery 22 has a low charge, the battery management chip 3 closes the second switch S2 and opens the third switch S3 and the fourth switch S4, connecting the second battery 22 to the battery management chip 3. An external power source charges the second battery 22 until the charge difference between the first battery 21 and the second battery 22 is within a first preset range.

[0191] If the first battery 21 has a low charge and the second battery 22 has a high charge, the battery management chip 3 closes the fourth switch S4 and the third switch S3, and opens the first switch S1 and the second switch S2, connecting the first battery 21 to the battery management chip 3. An external power source charges the first battery 21 until the charge difference between the first battery 21 and the second battery 22 is within a first preset range.

[0192] The first preset range is the error range for balancing the two batteries, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple charge difference ranges of the first battery 21 and the second battery 22 when they are balanced, such as the mean or median of multiple charge difference ranges when the first battery 21 and the second battery 22 are balanced; it can also be set based on empirical values.

[0193] With the main control board 7 connected to an external power source, closing the corresponding switch connects the low-power battery to the battery management chip 3, allowing the external power source to charge the low-power battery and balance the dual batteries.

[0194] When the main control board 7 is not connected to an external power source:

[0195] The battery management chip closes the fourth switch S4, the second switch S2, and the third switch S3, and opens the first switch S1. After connecting the first battery 21 and the second battery 22 in parallel, it is then connected to the battery management chip 3, so that the high-capacity battery charges the low-capacity battery until the difference in capacity between the first battery 21 and the second battery 22 is within a first preset range.

[0196] Similarly, the first preset range is the error range for dual-battery balancing, which can be set according to actual needs. For example, it can be obtained by statistically analyzing multiple charge difference ranges of the first battery 21 and the second battery 22 when they are balanced, such as the mean or median of multiple charge difference ranges when the first battery 21 and the second battery 22 are balanced; it can also be set based on empirical values.

[0197] When the main control board 7 is not connected to an external power source, closing the corresponding switch connects the low-capacity battery and the high-capacity battery in parallel, forming a dual-battery charging and discharging circuit. The high-capacity battery charges the low-capacity battery, thereby balancing the two batteries.

[0198] In one possible implementation, discharge balancing can be achieved by connecting two batteries in parallel and charging the lower-charge battery with the higher-charge battery to achieve balance. Alternatively, the higher-charge battery can be connected to a discharge resistor to discharge to the outside to achieve balance. As long as the higher-charge battery can be discharged to balance the charge of the two batteries, the specific method of discharge balancing is not limited in the embodiments of this application.

[0199] In step S804, the battery management chip 3 determines whether to perform low-charge discharge. Low-charge discharge refers to the process where, when a low charge is detected in battery pack 2, the two batteries in battery pack 2 are connected in parallel to increase the discharge current. Determining low-charge discharge ensures even current distribution to each battery, extending the lifespan of battery pack 2. In a low-charge discharge scenario, the two batteries in battery pack 2 switch to a parallel connection state.

[0200] In this embodiment of the application, the specific low-voltage discharge process is as follows:

[0201] When the charge of battery pack 2 is less than or equal to the tenth threshold, battery management chip 3 closes the fourth switch S4, the second switch S2, and the third switch S3, opens the first switch S1, connects the second battery 22 in parallel with the first battery 21, and then connects it to battery management chip 3.

[0202] The tenth threshold is the battery capacity threshold for battery pack 2, which can be set according to actual needs. For example, it can be obtained by counting multiple battery capacities of battery pack 2 when it is low, such as counting the minimum value of multiple battery capacities when battery pack 2 is low; it can also be set based on empirical values.

[0203] In this embodiment of the application, the battery pack 2's charge level can be displayed on the display screen 294 of the electronic device 100.

[0204] In one possible implementation, the battery pack 2's charge level on the display screen 294 of the electronic device 100 can be displayed as a percentage or as the actual charge level. This application embodiment does not limit the form of displaying the battery pack 2's charge level.

[0205] When the battery pack 2 has low power, the corresponding switch is closed, which connects the two batteries in the battery pack 2 in parallel and then connects them to the battery management chip 3. At this time, the battery pack 2 is connected to the main control board 7 and discharges to the main control board 7, so that the current distribution of each battery in the battery pack 2 is even, thereby extending the service life of the battery pack 2.

[0206] Step S805, normal charging and discharging. Normal charging and discharging refers to the charging and discharging of battery pack 2 under normal conditions, with battery pack 2 connected to battery management chip 3 and main control board 7 conducting electricity, and main control board 7 connected to an external power source. Here, "normal conditions" refers to the default state of battery pack 2, meaning that battery pack 2 does not exhibit any abnormalities, such as no abnormal protection activation, no need for charge / discharge balancing, or low battery status.

[0207] In one possible implementation, the normal charging and discharging process is as follows:

[0208] In the default state of battery pack 2, battery management chip 3 closes the fourth switch S4 and the first switch S1, and opens the second switch S2 and the third switch S3, connecting the first battery 21 and the second battery 22 in series, and then connecting them to battery management chip 3. The default state of battery pack 2 means that the first state parameter of the first battery 21 and the second state parameter of the second battery 22 are both within a preset range.

[0209] In this context, the default state of battery pack 2 refers to the normal state parameters of each battery in battery pack 2 (i.e., the first battery 21 and the second battery 22). For example, the first state parameter of the first battery 21 is within a preset range, meaning there are no issues such as overvoltage, undervoltage, high temperature, low temperature, overcurrent, or low charge. Similarly, the second state parameter of the second battery 22 is within a preset range, meaning there are no issues such as overvoltage, undervoltage, high temperature, low temperature, overcurrent, or low charge. In the default state of battery pack 2, the first battery 21 and the second battery 22 are connected in series and then connected to the battery management chip 3. This series connection method results in high voltage and low current, leading to less heat generation and lower power loss in battery pack 2, thus achieving high charging efficiency.

[0210] In the embodiments of this application, in the default state of battery pack 2, a single battery can be connected to battery management chip 3, or two batteries can be connected in parallel to battery management chip 3. As long as the connection between battery pack 2 and battery management chip 3 can be made to work normally, the embodiments of this application do not limit the specific connection method.

[0211] This application embodiment also provides a battery pack, which may include a battery group and a battery management circuit as described above. The battery management circuit is used to control the connection state between the battery group and the battery management chip 3 in the battery management circuit through a battery group control circuit, based on the detected state parameters of the battery group.

[0212] This application embodiment also provides an electronic device, which may include a main control board and a battery pack as described above. After receiving the connection information of the external power source from the main control board, the battery management chip in the battery pack controls the connection state between the battery pack and the battery management chip through the battery pack control circuit in the battery pack according to the status parameters of the battery pack in the battery pack and the connection information of the external power source.

[0213] The battery management circuit, battery pack, and electronic device provided in this application embodiment are provided. The battery management circuit is set on the battery pack and adopts a single-chip battery management chip. It detects the status parameters of the battery pack in real time and controls the connection status between the battery pack and the battery management chip in the battery management circuit through the battery pack control circuit according to the status parameters of the battery pack. This controls the conduction and shutdown of the battery pack 2 and the main control board 7. It improves the problems of poor real-time performance, high cost, low charging efficiency, high power consumption, complex control process, and failure to power on electronic devices caused by controlling the conduction and shutdown of the battery pack and the main control board through multiple battery management chips. It improves real-time performance and charging efficiency, reduces cost, reduces power consumption, simplifies the control process, and enables the electronic device to be powered on successfully.

[0214] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing embodiments, and will not be repeated here.

[0215] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located on one device or distributed across multiple devices. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0216] In addition, the functional modules in the various embodiments of this application can be integrated into one device, or each module can exist physically separately, or two or more modules can be integrated into one device.

[0217] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery management circuit, characterized in that, The battery management circuit is mounted on the battery pack, and the battery management circuit includes a battery management chip and a battery pack control circuit. The battery management chip monitors the status parameters of the battery pack in the battery pack in real time. The battery management chip controls the connection status between the battery pack and the battery management chip through the battery pack control circuit based on the status parameters of the battery pack.

2. The battery management circuit according to claim 1, characterized in that, The battery pack includes a first battery and a second battery. The battery pack control circuit includes a first switch, a second switch, a third switch, and a fourth switch. The first terminal of the fourth switch is connected to the battery management chip, and the second terminal of the fourth switch is connected to the positive terminal of the first battery. The negative terminal of the first battery is connected to the first terminal of the first switch, and the second terminal of the first switch is connected to the positive terminal of the second battery. The negative terminal of the first battery is connected to the first terminal of the third switch, and the second terminal of the third switch is connected to the negative terminal of the second battery. The first terminal of the fourth switch is connected to the first terminal of the second switch, and the second terminal of the second switch is connected to the positive terminal of the second battery. The control terminals of the first switch, the second switch, the third switch, and the fourth switch are all connected to the battery management chip.

3. The battery management circuit according to any one of claims 1-2, characterized in that, The state parameters of the battery pack include at least one of the following: voltage, current, temperature, and charge.

4. The battery management circuit according to claim 3, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the first state parameter of the first battery is detected to be greater than a first threshold or less than a second threshold, the battery management chip disconnects the third switch and the fourth switch and connects the second battery to the battery management chip; wherein, the second threshold is less than the first threshold, and the first state parameter is the voltage or temperature of the first battery.

5. The battery management circuit according to claim 3, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the first state parameter of the first battery is detected to be greater than the third threshold, the battery management chip disconnects the third switch and the fourth switch, and connects the second battery to the battery management chip; wherein, the first state parameter is the current of the first battery.

6. The battery management circuit according to claim 3, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the first state parameter of the first battery is detected to be less than the fourth threshold, the battery management chip disconnects the third switch and the fourth switch, and connects the second battery to the battery management chip; wherein, the first state parameter is the charge level of the first battery.

7. The battery management circuit according to claim 3, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the second state parameter of the second battery is detected to be greater than the fifth threshold or less than the sixth threshold, the battery management chip disconnects the first switch and the second switch and connects the first battery to the battery management chip; wherein the sixth threshold is less than the fifth threshold, and the second state parameter is the voltage or temperature of the second battery.

8. The battery management circuit according to claim 3, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the second state parameter of the second battery is detected to be greater than the seventh threshold, the battery management chip disconnects the first switch and the second switch, and connects the first battery to the battery management chip; wherein, the second state parameter is the current of the second battery.

9. The battery management circuit according to claim 3, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the second state parameter of the second battery is detected to be less than the eighth threshold, the battery management chip disconnects the first switch and the second switch, and connects the first battery to the battery management chip; wherein, the second state parameter is the charge level of the second battery.

10. The battery management circuit according to any one of claims 3-4 and 7, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: If the voltage difference between the first battery and the second battery is detected to be greater than a ninth threshold, in response to the received connection information of the external power source, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit, so that the voltage of the first battery and the second battery are balanced.

11. The battery management circuit according to claim 10, characterized in that, In response to received connection information from an external power source, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit, thereby balancing the voltages of the first battery and the second battery, including: In response to receiving first connection information from the main control board, the first connection information is used to instruct the main control board to connect to the external power supply; When the first battery has a high charge and the second battery has a low charge, the battery management chip closes the second switch and opens the third and fourth switches, connecting the second battery to the battery management chip. The external power supply charges the second battery until the charge difference between the first and second batteries is within a first preset range; or... When the first battery has a low charge and the second battery has a high charge, the battery management chip closes the fourth switch and the third switch, and opens the first switch and the second switch, connecting the first battery to the battery management chip so that the external power supply charges the first battery until the charge difference between the first battery and the second battery is within a first preset range.

12. The battery management circuit according to claim 10, characterized in that, In response to received connection information from an external power source, the battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit, thereby balancing the voltages of the first battery and the second battery, including: In response to receiving second connection information from the main control board, the second connection information is used to indicate that the main control board is not connected to the external power supply; The battery management chip closes the fourth switch, the second switch, and the third switch, and opens the first switch. After connecting the first battery and the second battery in parallel, it connects to the battery management chip, so that the high-capacity battery charges the low-capacity battery until the capacity difference between the first battery and the second battery is within a first preset range.

13. The battery management circuit according to any one of claims 3, 6, and 9, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: When the battery pack's charge is less than or equal to the tenth threshold, the battery management chip closes the fourth switch, the second switch, and the third switch, opens the first switch, connects the second battery in parallel with the first battery, and then connects it to the battery management chip.

14. The battery management circuit according to any one of claims 2-13, characterized in that, The battery management chip controls the connection state between the battery pack and the battery management chip through the battery pack control circuit based on the battery pack's status parameters, including: In the default state of the battery pack, the battery management chip closes the fourth switch and the first switch, and opens the second switch and the third switch, connecting the first battery and the second battery in series, and then connecting them to the battery management chip; wherein, the default state of the battery pack means that the first state parameter of the first battery and the second state parameter of the second battery are both within a preset range.

15. A battery pack, characterized in that, The battery pack includes a battery assembly and a battery management circuit as described in any one of claims 1-14. The battery management circuit is used to control the connection state between the battery assembly and the battery management chip in the battery management circuit through a battery assembly control circuit based on the detected state parameters of the battery assembly.

16. An electronic device, characterized in that, The system includes a main control board and a battery pack as described in claim 15. After receiving connection information from an external power source from the main control board, the battery management chip in the battery pack controls the connection status between the battery pack and the battery management chip through the battery pack control circuit in the battery pack, based on the status parameters of the battery pack in the battery pack and the connection information of the external power source.

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