Battery monitoring circuit control method, battery management system, battery equipment and electronic equipment

Abstract

A battery monitoring circuit control method comprises the following steps: when the communication failure duration of a battery monitoring circuit and a control circuit is greater than or equal to a first duration, configuring a first pin of the battery monitoring circuit to be in a high-resistance state, and sending a first control signal to the battery monitoring circuit, so that the battery monitoring circuit responds to the first control signal to execute an initialization operation. Wherein the first pin is a multifunctional pin.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, and in particular to a battery monitoring circuit control method, a battery management system, a battery device, and an electronic device. Background Art

[0002] Battery monitoring circuits (such as analog front-end chips) are electronic devices used in electronic systems to collect analog signals and perform preliminary processing on them. They serve as a bridge between sensors and control circuits. In battery management systems, battery monitoring circuits monitor data such as battery voltage, current, and temperature, perform preliminary processing on this data, and transmit the processed data to the control circuit (such as a microprocessor unit) through communication. Summary of the Invention

[0003] Embodiments of the present application provide a battery monitoring circuit control method, a battery management system, a battery device, and an electronic device, which restore communication between a battery monitoring circuit and a control circuit when communication between the two fails.

[0004] In a first aspect, the present application provides a method for controlling a battery monitoring circuit. The control method includes: in response to a communication failure duration being greater than or equal to a first duration, configuring a first pin of the battery monitoring circuit to be in a high-impedance state, sending a first control signal to the battery monitoring circuit, and causing the battery monitoring circuit to perform an initialization operation in response to the first control signal, wherein the communication failure duration is the duration of communication failure between the control circuit and the battery monitoring circuit, and the first pin is a multi-function pin. In some embodiments, the first pin is a general-purpose output port.

[0005] When the communication failure between the battery monitoring circuit and the control circuit lasts for a first duration, the first pin is set to a high-impedance state, effectively disconnecting the circuit connection at the first pin. This prevents or minimizes current flow, reduces leakage current at the first pin, and stabilizes the voltage output by the voltage conversion unit in the battery monitoring circuit, allowing the voltage output by the voltage conversion unit to properly power the internal circuits of the battery monitoring circuit. After the battery monitoring circuit is reinitialized, normal operation resumes. Communication between the battery monitoring circuit and the control circuit is automatically restored, eliminating the need for factory repairs.

[0006] In some embodiments, sending the first control signal to the battery monitoring circuit includes one of the following steps: sending a power-down signal and a wake-up signal to the battery monitoring circuit; sending a reset signal to the battery monitoring circuit; or sending a reset signal and a wake-up signal to the battery monitoring circuit. The battery monitoring circuit powers down in response to the power-down signal, resets in response to the reset signal, and wakes up in response to the wake-up signal.

[0007] In some embodiments, the battery monitoring circuit receives a reset signal and a power-down signal through the same pin (hereinafter referred to as the shutdown reset pin). The control circuit sends a reset signal to the shutdown reset pin to trigger the reset function of the battery monitoring circuit, and sends a power-down signal to the shutdown reset pin to trigger the power-down function of the battery monitoring circuit. Optionally, the power-down signal may include a first-level signal lasting for a fourth duration, and the reset signal may include a second-level signal that is less than a fifth duration, the fifth duration being less than or equal to the fourth duration, the fourth duration being greater than or equal to 1 second, and the fifth duration being less than 1 second. The first-level signal is either high or low, and the second-level signal is either high or low. Using the same pin to implement both power-down and multiplexing functions conserves pin resources.

[0008] Control the battery monitoring circuit to perform a "power-down + wake-up" operation, completely powering off the battery monitoring circuit. Then, powering on the battery monitoring circuit again and reinitializing it, returning it to its initial state at the physical level. This completes initialization and increases the probability that the battery monitoring circuit will return to normal operation. Control the battery monitoring circuit to perform a "reset + wake-up" operation, causing the battery monitoring circuit to perform two initialization operations, increasing the probability that the battery monitoring circuit will return to normal operation.

[0009] In other embodiments, the battery monitoring circuit control method further includes: in response to a communication failure duration being greater than or equal to a third duration and less than the first duration, sending a second control signal to the battery monitoring circuit, wherein the battery monitoring circuit performs an initialization operation in response to the second control signal. Sending the second control signal to the battery monitoring circuit includes one of the following steps: sending a power-off signal and a wake-up signal to the battery monitoring circuit; sending a reset signal to the battery monitoring circuit; or sending a reset signal and a wake-up signal to the battery monitoring circuit.

[0010] In other embodiments, the battery monitoring circuit control method further includes: in response to a communication failure duration being greater than or equal to a second duration and less than a third duration, sending a wake-up signal to the battery monitoring circuit, the battery monitoring circuit performing an initialization operation in response to the wake-up signal, and the third duration being less than the first duration.

[0011] Some embodiments of the present application improve the efficiency of restoring communication between the battery monitoring circuit and the control circuit by adopting a hierarchical processing approach for communication failures.

[0012] In some other embodiments, when the communication failure duration between the battery monitoring circuit and the control circuit reaches a third duration, the control circuit further controls the charging switch and / or the discharging switch to turn off, where the third duration is less than the first duration. When communication failure between the battery monitoring circuit and the control circuit is determined, the charging switch and / or the discharging switch is turned off, thereby improving the safety of the BMS.

[0013] In other embodiments, a communication failure flag is recorded when the communication failure duration is greater than or equal to a third duration, and the third duration is less than the first duration. The communication failure flag is used to mark a communication failure event. A functional module in the control circuit marks the communication failure flag, and other functional modules process the communication failure event based on the communication failure flag, achieving modular processing and improving the operating efficiency of the control circuit.

[0014] In a second aspect, an embodiment of the present application further provides a battery management system, including a battery monitoring circuit and a control circuit, wherein the battery monitoring circuit and the control circuit are used in the battery monitoring circuit control method of the first aspect.

[0015] In a third aspect, an embodiment of the present application further provides a battery device, comprising a battery module and the battery management system described in the second aspect, wherein the battery module is electrically connected to the battery management system. In a fourth aspect, an embodiment of the present application further provides an electronic device, comprising a load and the battery device described in the third aspect, wherein the battery device is used to power the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by the figures in the accompanying drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0017] Figure 1 is a schematic structural diagram of an electronic device in an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the battery device in the embodiment of the present application; Figure 3 is a structural diagram of a battery monitoring circuit in an embodiment of the present application; Figure 4 This is a schematic diagram of the reset signal and power-off signal in the embodiment of the present application; Figure 5 is a structural diagram of a battery monitoring circuit in an embodiment of the present application; Figure 6 This is a flowchart of a battery monitoring circuit control method according to an embodiment of the present application; Figure 7 This is a flowchart of a battery monitoring circuit control method according to an embodiment of the present application; Figure 8 This is a flowchart of a battery monitoring circuit control method according to an embodiment of the present application; Figure 9 This is a flowchart of a battery monitoring circuit control method according to an embodiment of the present application; Figure 10 This is a flowchart of a battery monitoring circuit control method according to an embodiment of the present application; Figure 11 It is a flowchart of the battery monitoring circuit control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0019] In the embodiments of the present application, words such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0020] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0021] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0022] Figure 1 An electronic device 1 is shown. In this application, the electronic device 1 refers to a device or system that uses electric energy to work. The electronic device 1 includes a load (not shown) and a battery device 1000. The battery device 1000 is used to power the load. In this application, optionally, the electronic device 1 is an electric vehicle, an aircraft, an electric tool, or an energy storage system. Specifically, electric vehicles may include electric vehicles, electric two-wheeled vehicles, electric three-wheeled vehicles, electric scooters, etc., aircraft may include unmanned aerial vehicles, manned aerial vehicles, etc., electric tools may include electric drills, sweeping robots, electric vacuum cleaners, etc., and energy storage systems may include portable mobile power supplies, household energy storage systems, industrial and commercial energy storage systems, uninterruptible power supplies, etc.

[0023] It is understandable that in different usage scenarios, the electronic device 1 has different product forms, and the corresponding battery device 1000 also presents different structural forms accordingly. For example, in electric two-wheeled vehicles, unmanned aerial vehicles, power tools, and portable mobile power supplies, the battery device 1000 appears in the form of a battery pack, and the battery module and battery management system are arranged in the battery pack; in household energy storage systems and industrial and commercial energy storage systems, the battery device 1000 has multiple parallel battery modules and battery management systems. The battery device 1000 of this application broadly refers to a battery and a control device for controlling the charging and discharging of the battery. This application does not specifically limit the specific structure and usage scenarios of the battery device 1000.

[0024] like Figure 2 As shown, the battery device 1000 includes a battery management system (BMS) 100 and a battery module 200. Depending on different usage scenarios, the battery module 200 has different structural forms, and the number of battery modules 200 is one or more. Among them, the battery module 200 includes multiple battery cells connected in parallel, series, or mixed (including series and parallel). Battery cells are used to store and provide electrical energy. As a component unit of the battery module, battery cells include lithium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, solid-state cells, etc. The BMS 100 manages the charging and / or discharging of the battery module 200, and is also used to monitor data such as the voltage, current, and cell temperature of the battery device to ensure the charging and discharging safety of the battery device.

[0025] The BMS 100 includes a battery monitoring circuit 10 and a control circuit 20. The battery monitoring circuit 10 is electrically connected to the battery module 200 and the control circuit 20, respectively. As a circuit connecting the battery module 200 and the control circuit 20, the battery monitoring circuit 10 is used to monitor the operating status of the battery device 1000, including collecting data such as battery cell voltage, battery cell temperature, and charge and discharge current in the main circuit, and performing preliminary processing on the collected data. The processed data is transmitted to the control circuit 20 via communication methods such as SPI / I²C. The control circuit 20 controls the charging and discharging of the battery based on this data.

[0026] In some embodiments, the battery monitoring circuit 10 includes an AFE chip, and the models of the AFE chip include BQ76PL455A, LTC6811, BQ76952, etc. The control circuit 20 includes a control chip, such as a microcontroller unit (MCU), etc.

[0027] Optionally, Figure 3 The diagram shows a partial structure of a battery monitoring circuit 10. The battery monitoring circuit 10 includes a voltage conversion unit, internal circuitry, and a logic control unit. The battery monitoring circuit 10 also includes multiple pins, some of which are multi-function pins. A multi-function pin is a pin that can assume multiple functions depending on the configuration or operating mode of the chip. For example, if the battery monitoring circuit is an AFE chip, the multi-function pins include: CFETOFF, DFETOFF, DCHG, DDSG, HDQ, ALERT, TS1, TS2, and TS3.

[0028] The voltage conversion unit is electrically connected to the battery module 200 and converts the output voltage of the battery module 200 into a target voltage. This target voltage serves as the supply voltage for the internal circuit and the logic control unit. For example, this target voltage is 1.8V. The internal circuit is a general term for the circuit structures or modules that implement various functions in the battery monitoring circuit 10. The logic control unit serves as the control part of the battery monitoring circuit 10 and is responsible for logical judgment, executing control logic, etc.

[0029] Figure 3 The following diagram illustrates some of the pins of the battery monitoring circuit 10, including the BAT pin, WAKE pin, RST_SHUT pin, function pin 1, function pin 2, communication pin 1, communication pin 2, a pin for collecting battery module voltage, and a pin for collecting battery module temperature. Some of these pins are multi-function pins. For example, communication pin 1 and communication pin 2 have other functions in addition to communication. Function pin 1 and function pin 2 have two or more functions.

[0030] Among them, the BAT pin is a power pin used to electrically connect to a power source, and the WAKE pin is a wake-up pin. The control circuit 20 sends a wake-up signal (e.g., a high-level signal) to the wake-up pin to trigger the wake-up function of the battery monitoring circuit 10. After the battery monitoring circuit 10 is awakened, the battery monitoring circuit 10 is initialized, including initialization of the communication interface, reconfiguration of registers, etc. Optionally or additionally, after the control circuit 20 wakes up the battery monitoring circuit 10, it can also set customized functions for the battery monitoring circuit 10.

[0031] The RST_SHUT pin is a shutdown reset pin that performs both a power-on reset and a power-off function on the battery monitoring circuit 10. In some embodiments of the present application, the control circuit 20 "long-pulls" the RST_SHUT pin to trigger the power-off function of the battery monitoring circuit 10. "Long-pulling" means that the trigger signal sent by the control circuit 20 to the RST_SHUT pin lasts for a long time. For example, the high-level signal sent by the control circuit 20 to the RST_SHUT pin lasts for more than 1 second, exemplarily, for 1500 milliseconds.

[0032] Optionally or additionally, the control circuit 20 can also "short-pull" the RST_SHUT pin to trigger a power-on reset of the battery monitoring circuit 10. "Short-pull" means that the trigger signal sent by the control circuit 20 to the RST_SHUT pin has a short duration. For example, the high-level signal sent by the control circuit 20 to the RST_SHUT pin lasts less than 1 second, illustratively, for 400 milliseconds. After the power-on reset, the battery monitoring circuit 10 performs initialization operations, including reinitializing internal logic and registers. Optionally or additionally, after the power-on reset of the battery monitoring circuit 10, the control circuit 20 can also set custom functions for the battery monitoring circuit 10.

[0033] In order to simplify the drawing, the "short pull" signal and the "long pull" signal are grouped together. Figure 4 shown.

[0034] Figure 3 One solution shown is to integrate the reset pin and the power-down pin into one pin. Optionally, in some other possible implementations, the reset pin and the power-down pin are different pins on the battery monitoring circuit. In this way, the control circuit can control the power-down and reset of the battery monitoring circuit separately, without the need for the control circuit to "long-pull" and turn off the reset pin to control the power-down of the battery monitoring circuit or "short-pull" and turn off the reset pin to control the reset of the battery monitoring circuit.

[0035] Alternatively or additionally, such as Figure 5 As shown, the battery monitoring circuit 10 may further include a DSG pin and a CHG pin. A charging switch and a discharging switch are provided on the BMS 100. The charging switch is provided on the charging path for controlling the charging of the battery module 200, and the discharging switch is provided on the discharging path for controlling the discharging of the battery module 200. The DSG pin is electrically connected to the discharging switch for controlling the on or off of the discharging switch, and the CHG pin is electrically connected to the charging switch for controlling the on or off of the charging switch. It is understandable that Figure 5 The circuit structure is that the charging port and the discharging port of the battery device 1000 are different ports. Figure 5 Another variation of this scheme is that the charging port and discharging port of the battery device 1000 are the same port, that is, the charging switch and the discharging switch are connected in series and arranged in the conductive path of the main circuit. Specifically, the charging switch and the discharging switch are connected in series and arranged between the positive output port P+ and the positive terminal B+ of the battery, or the charging switch and the discharging switch are connected in series and arranged between the negative output port P- and the negative terminal B- of the battery.

[0036] Please refer to Figure 5 The control circuit 20 communicates with the battery monitoring circuit 10 through a communication transmission line to control the opening or closing of the charging switch and the discharging switch.

[0037] As mentioned above, the battery monitoring circuit 10 needs to maintain communication with the control circuit 20 so that the control circuit 20 can obtain data from the battery device and control the battery monitoring circuit 10 to drive the charge and discharge switches to open and close. However, when the communication between the two fails, the battery monitoring circuit 10 cannot respond to the control circuit 20, and the battery device cannot work normally or cannot be stopped, resulting in the battery device losing control and posing a risk of use. In addition, when the battery monitoring circuit 10 cannot respond to the control circuit 20 for a long time, the battery device needs to be returned to the factory for repair, which reduces the user experience and increases the repair cost.

[0038] The applicant discovered that there are multiple reasons for the communication failure between the battery monitoring circuit 10 and the control circuit 20. When further studying the mechanism causing the communication failure between the battery monitoring circuit 10 and the control circuit 20, it was found that: when the control circuit 20 sends a low level to the battery monitoring circuit 10, some pins of the battery monitoring circuit 10 change from input state to output state, thereby generating leakage current, lowering the voltage output by the voltage conversion unit (for example, lowering 1.8V to less than 1.7V), causing the internal circuit of the battery monitoring circuit 10 to fail to work normally due to the reduced supply voltage, thereby causing the communication failure between the battery monitoring circuit 10 and the control circuit 20.

[0039] After discovering the above-mentioned technical problems, the applicant designed a battery monitoring circuit control method. This control method can restore communication between the battery monitoring circuit 10 and the control circuit 20 after communication failure occurs, eliminating the need for factory repair and reducing repair costs. This method involves controlling the multi-function pin of the battery monitoring circuit 10 to a high-impedance state after communication failure. The control circuit 20 then sends a control signal to the battery monitoring circuit to cause the battery monitoring circuit 10 to perform an initialization operation. Setting the multi-function pin of the battery monitoring circuit 10 to a high-impedance state effectively "disconnects" the circuit connection, preventing or minimizing current flow, reducing leakage current, and stabilizing the output voltage of the voltage conversion unit (for example, stabilizing the output voltage at 1.8V), allowing it to properly power the internal circuits of the battery monitoring circuit 10. After receiving the control signal from the control circuit 20, the battery monitoring circuit 10 performs the initialization operation, resuming normal operation and thus establishing a communication connection between the battery monitoring circuit 10 and the control circuit 20.

[0040] The battery monitoring circuit control method according to an embodiment of the present application is described in detail below.

[0041] like Figure 6 As shown, the battery monitoring circuit control method of the present application includes: Step 101: When the communication failure duration is greater than or equal to a first duration, configure a first pin of a battery monitoring circuit to be in a high-impedance state.

[0042] When the duration of the communication failure between the control circuit and the battery monitoring circuit reaches a first duration, the first pin of the battery monitoring circuit is configured to be in a high-impedance state. Communication failure refers to the loss of communication between the control circuit and the battery monitoring circuit, and the battery monitoring circuit is unable to respond to the control circuit. The first duration is set according to product specifications and requirements. For products with high communication requirements, the first duration is set to be smaller, for example, less than or equal to 65 seconds, and exemplarily, 62 seconds or 65 seconds. For products with low communication requirements, the first duration is set to be larger, for example, greater than 65 seconds, and exemplarily, 105 seconds or 102 seconds. It is understandable that this application does not specifically limit the first duration.

[0043] The first pin is a multi-function pin of the battery monitoring circuit. Optionally, the first pin can be a general-purpose output (GPO). Exemplarily, the battery monitoring circuit is a BQ76952 AFE chip. The first pin includes one or more of the following pins: CFETOFF pin, DFETOFF pin, DCHG pin, DDSG pin, HDQ pin, ALERT pin, TS1 pin, TS2 pin, and TS3 pin.

[0044] The first pin being in a high-impedance state means that the first pin presents a high impedance to ground. In some implementations, the battery monitoring circuit has one or more first pins, and the first pins are electrically connected to a control circuit. The control circuit configures the first pin to be in a high-impedance state via a configuration register. The high-impedance state of the first pin is achieved by electrically connecting the first pin to a resistor with a relatively large resistance. The resistance value of the resistor can be determined based on the supply voltage (e.g., 1.8V). The purpose is to ensure that the output voltage of the voltage conversion unit is stable at or near the supply voltage after the first pin is connected to the resistor.

[0045] Alternatively or additionally, the first pin may further include a multi-function pin that is not connected to the control circuit. If the first pin is suspended, the first pin remains in the suspended state.

[0046] 102: Send a first control signal to the battery monitoring circuit.

[0047] The first control signal is used to control the battery monitoring circuit to perform an initialization operation. The first control signal includes one of the following signals: a power-down signal and a wake-up signal, a reset signal, or a reset signal and a wake-up signal. The control circuit triggers the battery monitoring circuit to perform the initialization operation in one of the following ways: Method A: Send power-down signal and wake-up signal to the battery monitoring circuit; Method B: Send a reset signal to the battery monitoring circuit; Method C: Send a reset signal and a wake-up signal to the battery monitoring circuit.

[0048] The battery monitoring circuit starts to perform an initialization operation when receiving one or two control signals among a power-off signal, a reset signal and a wake-up signal sent by the control circuit.

[0049] In some embodiments, the initialization operation of the battery monitoring circuit includes one or more of the following operations: self-test, register configuration, and communication interface initialization.

[0050] The control circuit triggers the battery monitoring circuit to perform initialization operations through method A, specifically including: (1) The control circuit sends a power-off signal to the battery monitoring circuit, and the battery monitoring circuit powers off after receiving the power-off signal; (2) The control circuit sends a wake-up signal to the battery monitoring circuit, and the battery monitoring circuit is awakened after receiving the wake-up signal.

[0051] The control circuit first sends a power-down signal to the battery monitoring circuit. Upon receiving the power-down signal, the battery monitoring circuit powers down and shuts down. The control circuit then sends a wake-up signal to the battery monitoring circuit. Upon receiving the wake-up signal, the battery monitoring circuit wakes up and begins initialization operations, including initializing the communication interface and reconfiguring registers. Optionally or additionally, after receiving the wake-up signal, the control circuit further configures customized functions for the battery monitoring circuit.

[0052] Through method A, the battery monitoring circuit is completely powered off, then powered on again and reinitialized, so that the battery monitoring circuit returns to its initial state from the physical layer, thereby improving the success rate of restoring communication between the battery monitoring circuit and the control circuit.

[0053] The control circuit triggers the battery monitoring circuit to perform an initialization operation through mode B, which specifically includes: the control circuit sends a reset signal to the battery monitoring circuit, and the battery monitoring circuit resets after receiving the reset signal.

[0054] The control circuit sends a reset signal to the battery monitoring circuit. Upon receiving the reset signal, the battery monitoring circuit resets during power-on and begins initialization operations, including reinitializing internal logic and registers. Optionally or additionally, after the battery monitoring circuit is reset during power-on, the control circuit further configures customized functions for the battery monitoring circuit. It will be appreciated that in approach B, the battery monitoring circuit is in a powered state during the reset.

[0055] The control circuit triggers the battery monitoring circuit to perform initialization operations through method C, specifically including: (1) The control circuit sends a reset signal to the battery monitoring circuit, and the battery monitoring circuit resets after receiving the reset signal; (2) The control circuit then sends a wake-up signal to the battery monitoring circuit, and the battery monitoring circuit is awakened after receiving the wake-up signal.

[0056] The control circuit first sends a reset signal to the battery monitoring circuit. After receiving the reset signal, the battery monitoring circuit is powered on and reset. The battery monitoring circuit begins initialization operations, including initializing the communication interface and reconfiguring registers. The control circuit then sends a wake-up signal to the battery monitoring circuit. After receiving the wake-up signal, the control circuit further configures customized functions for the battery monitoring circuit.

[0057] Method C uses a "reset" and "wake-up" process. If the battery monitoring circuit receives a reset signal but another program in the control circuit takes precedence, the original reset signal may become a power-down signal. To avoid this, the control circuit sends a wake-up signal to the battery monitoring circuit to ensure that the battery monitoring circuit wakes up, thereby improving the success rate of restoring communication between the battery monitoring circuit and the control circuit.

[0058] In some embodiments, the battery monitoring circuit is provided with three different pins: a wake-up pin, a power-down pin, and a reset pin. The battery monitoring circuit receives wake-up signals, power-down signals, and reset signals from the control circuit through these three pins. The control circuit sends control signals (e.g., high-level signals or low-level signals with a certain duration) to different pins to trigger the wake-up, power-down, and reset functions of the battery monitoring circuit, respectively.

[0059] Optionally, the power-down pin and reset pin on the battery monitoring circuit share a single pin (hereinafter referred to as the power-down reset pin), while the wake-up pin is a separate pin. The control circuit sends different control signals to the power-down reset pin to trigger the power-down and reset functions of the battery monitoring circuit. For example, a short pull of the power-down reset pin triggers the reset function of the battery monitoring circuit, while a long pull of the power-down reset pin triggers the power-down function of the battery monitoring circuit. The control circuit sends a control signal (such as a high-level signal or a low-level signal sustained for a certain period of time) to the wake-up pin to trigger the wake-up function of the battery monitoring circuit. Sharing the same pin for the power-down and reset pins conserves pin resources.

[0060] When communication between the battery monitoring circuit and the control circuit fails for a first duration, the first pin is set to a high-impedance state, effectively disconnecting the first pin. This prevents or minimizes current flow, reduces leakage current on the first pin, and stabilizes the voltage output by the voltage conversion unit, thereby providing a stable power supply for the internal circuits of the battery monitoring circuit. After the battery monitoring circuit is reinitialized, normal operation resumes, and communication between the battery monitoring circuit and the control circuit is automatically restored, eliminating the need for factory repair.

[0061] Optionally or additionally, there may be a certain time interval between step 101 and step 102, such as an interval of 1S-10S, illustratively, an interval of 2S, 3S, etc. This application does not impose any specific limitation on the length of the interval.

[0062] Optionally or additionally, the battery monitoring circuit control method may further include: when the communication failure duration is greater than or equal to the third duration and less than the first duration, the control circuit sending a second control signal to the battery monitoring circuit. The second control signal is used to control the battery monitoring circuit to perform an initialization operation, and the second control signal includes one of the following signals: a power-off signal and a wake-up signal, a reset signal, or a reset signal and a wake-up signal. The control circuit triggers the battery monitoring circuit to perform the initialization operation in one of the following ways: Method A: Send power-down signal and wake-up signal to the battery monitoring circuit; Method B: Send a reset signal to the battery monitoring circuit; Method C: Send a reset signal and a wake-up signal to the battery monitoring circuit.

[0063] When the communication failure duration between the battery monitoring circuit and the control circuit reaches a third duration but has not reached the first duration, the battery monitoring circuit is first controlled to perform an initialization operation using one of methods A, B, and C. If communication between the battery monitoring circuit and the control circuit cannot be restored using methods A, B, or C, and the communication failure duration reaches the first duration, the first pin is set to a high-impedance state and the battery monitoring circuit is reinitialized. In this way, a hierarchical approach is adopted for communication failures, improving the efficiency of restoring communication between the battery monitoring circuit and the control circuit.

[0064] For the description of Method A, Method B and Method C, please refer to the above introduction, which will not be repeated here. The third duration is set according to the product specifications and requirements. For products with higher communication requirements, the third duration is set to be smaller, for example, less than or equal to 62S, exemplarily, 60S or 61S. For products with lower communication requirements, the third duration is set to be larger, for example, greater than 60S, exemplarily, 100S or 101S. The third duration is less than the first duration, and the interval between the first duration and the third time is 1S-5S, exemplarily, 1S, 2S, 3S, 4S or 5S. It is understandable that this application does not specifically limit the third duration.

[0065] Optionally or additionally, the battery monitoring circuit control method may further include: D: If the communication failure duration is greater than or equal to the second duration and less than the third duration, the control circuit sends a wake-up signal to the battery monitoring circuit to wake up the battery monitoring circuit.

[0066] When the communication failure duration between the battery monitoring circuit and the control circuit reaches the second duration but has not reached the third duration, a wake-up signal is first sent to the battery monitoring circuit to wake up the battery monitoring circuit. If the communication between the battery monitoring circuit and the control circuit still cannot be restored by waking up the battery monitoring circuit, other communication restoration operations are performed.

[0067] The specific implementation process of method D includes: The control circuit sends a wake-up signal to the battery monitoring circuit, and the battery monitoring circuit performs a wake-up operation upon receiving the wake-up signal.

[0068] The control circuit sends a wake-up signal to the battery monitoring circuit. Upon receiving the wake-up signal, the battery monitoring circuit wakes up and performs initialization operations for the battery monitoring circuit, including initializing the communication interface and reconfiguring registers. Optionally or additionally, after the battery monitoring circuit wakes up, the control circuit may further configure customized functions for the battery monitoring circuit.

[0069] The second duration is less than the third duration and less than the first duration. The second duration is set according to product specifications and requirements and is a relatively small value, such as 1S-10S. Exemplarily, it is 4S, 5S, 6S, 7S, 8S, 9S or 10S.

[0070] Figure 7 and Figure 8 Some embodiments of the battery monitoring circuit control method of the present application are exemplified. Other embodiments of the battery monitoring circuit control method further include at least: ① If the communication failure duration is greater than or equal to the third duration and less than the first duration, execute method A. If communication is not restored and the communication failure duration is greater than or equal to the first duration, configure the first pin of the battery monitoring circuit to a high-impedance state and execute method A.

[0071] 2. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode A is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode B is executed.

[0072] 3. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode A is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode C is executed.

[0073] 4. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode B is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode A is executed.

[0074] 5. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode B is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode B is executed.

[0075] 6. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode B is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode C is executed.

[0076] 7. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode C is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode A is executed.

[0077] 8. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode C is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode B is executed.

[0078] 9. The communication failure time is greater than or equal to the third time length and less than the first time length, and the execution mode C is executed. The communication is not restored and the communication failure time is greater than or equal to the first time length. The first pin of the battery monitoring circuit is in a high resistance state, and the execution mode C is executed.

[0079] Optionally or additionally, the battery monitoring circuit control method can further include: In the above embodiments 1-9, the communication failure time is greater than or equal to the second time length and less than the third time length, and the control circuit sends a wake-up signal to the battery monitoring circuit to wake up the battery monitoring circuit.

[0080] In some other embodiments, please refer to Figure 9 To improve the safety of the BMS, when the communication failure duration between the battery monitoring circuit and the control circuit reaches a third duration, the control circuit further controls the charging switch and / or the discharging switch to be turned off.

[0081] In some embodiments, the control circuit directly controls the charging switch and / or the discharging switch to be turned off.

[0082] Optionally, the control circuit controls the charging switch and / or the discharging switch to be turned off through the battery monitoring circuit. Specifically, the control circuit sends an electrical signal to a functional pin other than the communication pin, and the battery monitoring circuit controls the charging switch and / or the discharging switch to be turned off based on the electrical signal.

[0083] by Figure 5 Taking the circuit structure shown as an example, the control circuit sends an electrical signal to the function pin 1 of the battery monitoring circuit to control the charging switch to be disconnected, and sends an electrical signal to the function pin 2 of the battery monitoring circuit to control the discharging switch to be disconnected.

[0084] Alternatively or additionally, see Figure 10 and Figure 11 The battery monitoring circuit control method of the present application may further include recording a communication failure flag when the communication failure duration is greater than or equal to a third duration. The communication failure flag is used to mark a communication failure event. A functional module in the control circuit marks the communication failure flag, and other functional modules process the communication failure event based on the communication failure flag, thereby implementing module-based processing and improving the operating efficiency of the control circuit.

[0085] The present application also provides a battery management system 100, please refer to Figure 2 BMS 100 includes the aforementioned battery monitoring circuit 10 and control circuit 20, which are electrically connected to each other. When communication between the battery monitoring circuit and the control circuit fails, the control circuit and the battery monitoring circuit execute the aforementioned battery monitoring circuit control method to restore communication between the battery monitoring circuit and the control circuit. For detailed descriptions of the hardware structure of the battery management system 100 and the battery monitoring control method executed by the control circuit, please refer to the above-described embodiment and will not be repeated here.

[0086] The present application also provides a battery device 1000, please refer to Figure 2 The battery device 1000 includes the battery management system 100 and the battery module 200 . Regarding the structure of the battery device 1000 , please refer to the description of the above embodiment, which will not be repeated here.

[0087] The present application also provides an electronic device 1, please refer to Figure 1The electronic device 1 includes a load (not shown) and the above-mentioned battery device 1000, and the battery device 1000 is used to power the load. In the present application, optionally, the electronic device 1 is an electric vehicle, an aircraft, an electric tool, or an energy storage system. Specifically, electric vehicles include electric vehicles, electric two-wheeled vehicles, electric three-wheeled vehicles, electric scooters, etc., aircraft include unmanned aerial vehicles, manned aerial vehicles, etc., electric tools include electric drills, sweeping robots, electric vacuum cleaners, etc., and energy storage systems include portable mobile power supplies, household energy storage systems, industrial and commercial energy storage systems, uninterruptible power supplies, etc.

[0088] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0089] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, and the steps may be implemented in any order. A person skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some of the technical features may be replaced by equivalents. However, such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery monitoring circuit control method, characterized in that: In response to a communication failure duration being greater than or equal to a first duration, configuring the first pin of the battery monitoring circuit to be in a high impedance state; sending a first control signal to the battery monitoring circuit, wherein the battery monitoring circuit performs an initialization operation in response to the first control signal; The communication failure duration is the duration of communication failure between the control circuit and the battery monitoring circuit, and the first pin is a multi-function pin.

2. The battery monitoring circuit control method according to claim 1, characterized in that: The sending of the first control signal to the battery monitoring circuit comprises one of the following steps: Sending a power-off signal and a wake-up signal to the battery monitoring circuit; sending a reset signal to the battery monitoring circuit; A reset signal and a wake-up signal are sent to the battery monitoring circuit.

3. The battery monitoring circuit control method according to claim 1 or 2, characterized in that: Also includes: In response to the communication failure duration being greater than or equal to the second duration and less than a third duration, sending a wake-up signal to the battery monitoring circuit, and the battery monitoring circuit performing an initialization operation in response to the wake-up signal; The third duration is shorter than the first duration.

4. The battery monitoring circuit control method according to any one of claims 1 to 3, characterized in that: The method further comprises: In response to the communication failure time being greater than or equal to a third time and less than the first time, sending a second control signal to the battery monitoring circuit, and the battery monitoring circuit performing an initialization operation in response to the second control signal; The sending of the second control signal to the battery monitoring circuit comprises one of the following steps: Sending a power-off signal and a wake-up signal to the battery monitoring circuit; sending a reset signal to the battery monitoring circuit; A reset signal and a wake-up signal are sent to the battery monitoring circuit.

5. The battery monitoring circuit control method according to any one of claims 2 to 4, characterized in that: The battery monitoring circuit is powered off in response to the power-off signal; The battery monitoring circuit is reset in response to the reset signal; The battery monitoring circuit wakes up in response to the wake-up signal.

6. The battery monitoring circuit control method according to claim 5, characterized in that: The power-off signal includes: a first level signal lasting for a fourth time period; The reset signal includes: a second level signal that is less than a fifth time length; The fifth duration is less than or equal to the fourth duration.

7. The battery monitoring circuit control method according to claim 6, characterized in that: The fourth duration is greater than or equal to 1 second.

8. The battery monitoring circuit control method according to any one of claims 1 to 7, characterized in that: Also includes: In response to the communication failure duration being greater than or equal to a third duration, controlling the charging switch and / or the discharging switch to be turned off; The third duration is shorter than the first duration.

9. The battery monitoring circuit control method according to any one of claims 1 to 8, characterized in that: Also includes: In response to the communication failure duration being greater than or equal to a third duration, recording a communication failure flag; The third duration is shorter than the first duration.

10. The battery monitoring circuit control method according to any one of claims 1 to 10, characterized in that: The first pin is a general output port.

11. A battery management system, comprising a battery monitoring circuit and a control circuit, characterized in that: The battery monitoring circuit and the control circuit are used to execute the method according to any one of claims 1 to 10.

12. A battery device, characterized in that: comprising a battery module and a battery management system as claimed in claim 11; Wherein, the battery module is electrically connected to the battery management system.

13. An electronic device, characterized in that: The invention comprises a load and the battery device according to claim 12, wherein the battery device is used to power the load.

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