Signal latching circuit, method, battery management system, battery system

Abstract

The application relates to a signal latching circuit, a method, a battery management system and a battery system, and belongs to the field of electronic circuits. The signal latching circuit comprises a controller, a latch and a first reset device. The controller is electrically connected with the latch and the first reset device respectively, and the latch is configured to be electrically connected with a switch on a charging path and / or a discharging path. The controller is configured to send a first signal to the latch and a second signal to the first reset device; wherein the first signal is used for controlling the switch to be turned on, and the second signal is used for indicating that the controller is in a working state. The first reset device is configured to send a reset signal to the controller in response to not receiving the second signal within a first duration. The latch is configured to latch the first signal during the reset of the controller.

Description

Technical Field

[0001] This application belongs to the field of electronic circuits, and specifically relates to a signal latching circuit, a method, a battery management system, and a battery system. Background Technology

[0002] With the development of integrated circuits, controllers such as MCUs (Micro Controller Units) have been widely used, for example in Battery Management Systems (BMS). Microcontrollers often experience program crashes due to external interference or other factors, causing them to malfunction. Currently, when a microcontroller malfunctions, the BMS directly cuts off the battery's charging and / or discharging paths. This affects the battery's normal charging and discharging, leading to poor BMS system stability and a negative impact on user experience. Summary of the Invention

[0003] Therefore, the purpose of this application is to provide a signal latching circuit, method, battery management system, and battery system to improve the current system's poor stability and poor user experience.

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, embodiments of this application provide a signal latching circuit, including: a controller, a latch, and a first reset device. The controller is electrically connected to both the latch and the first reset device, and the latch is configured to be electrically connected to a switch on a charging path and / or a discharging path. The controller is configured to send a first signal to the latch and a second signal to the first reset device. The first signal controls the switch to turn on, and the second signal indicates that the controller is in an operating state. The first reset device is configured to send a reset signal to the controller in response to not receiving the second signal for a first duration. The latch is configured to latch the first signal during a controller reset.

[0006] In this embodiment, a latch is used to latch the first signal used to control the switch to turn on, keeping it unchanged during controller reset. This prevents the battery's charging and / or discharging paths from being directly cut off when the controller malfunctions, thus avoiding affecting the battery's normal charging and discharging. This improves the current BMS system's poor stability and user experience. Meanwhile, if the first reset device does not receive the second signal within the first duration, it sends a reset signal to the controller to reset it, thereby restoring normal operation and ensuring the system's stable operation.

[0007] In one possible implementation of the first aspect embodiment, the first reset device is a first watchdog timer.

[0008] In this embodiment of the application, selecting a watchdog timer to send a reset signal to the controller can reduce costs and complexity of the solution while achieving the purpose of the invention, thus increasing the applicability of the solution.

[0009] In one possible implementation of the first aspect embodiment, the device further includes: a second reset device; the second reset device is electrically connected to both the controller and the latch; the second reset device is configured to send a reset signal to the latch in response to not receiving the second signal within a second duration, thereby controlling the switch to turn off. The second duration is longer than the first duration.

[0010] In this embodiment, the latch is reset by a second reset device to control the switch to turn off, thereby reducing the risk that when the controller has a permanent malfunction, the switches on the battery charging path and / or discharging path will always be in the conducting state, thus losing effective protection for the battery and causing safety risks such as overcharging, over-discharging, and short circuits.

[0011] In one possible implementation of the first aspect embodiment, the second duration is less than a duration threshold. The duration threshold is configured such that, within the duration threshold, the controller enters an abnormal state after receiving the reset signal.

[0012] In this embodiment of the application, by setting an upper limit for the second duration, i.e. less than the duration threshold, the system can be guaranteed to operate safely and reliably, and avoid the fact that the switches on the charging path and / or discharging path of the battery are in a conducting state for a long time due to the second duration being too long, and cannot be turned off, thereby causing safety risks.

[0013] In one possible implementation of the first aspect embodiment, the second reset device is a second watchdog.

[0014] In this embodiment, a watchdog timer is selected to send a reset signal to the controller. This reduces costs and complexity while achieving the invention's objective, thus increasing the applicability of the solution.

[0015] Secondly, embodiments of this application also provide a signal latching circuit, including: a controller, a latch, and a second reset device. The controller is electrically connected to both the latch and the second reset device, and the second reset device is also electrically connected to the latch. The latch is configured to be electrically connected to a switch on a charging path and / or a discharging path. The controller is configured to send a first signal to the latch and a second signal to the second reset device. The first signal is used to control the switch to turn on, and the second signal is used to indicate that the controller is in an operating state. The latch is configured to latch the first signal in response to a controller reset. The second reset device is configured to send a reset signal to the latch in response to not receiving the second signal from the controller within a second duration, to control the switch to turn off.

[0016] Thirdly, embodiments of this application also provide a battery management system, including a charging switch and a discharging switch, as well as the aforementioned signal latching circuit. The latch is electrically connected to the charging switch and / or the discharging switch.

[0017] In one possible implementation of the third aspect embodiment, it further includes: a switch driving circuit, wherein the latch is electrically connected to the input terminal of the switch driving circuit, and the output terminal of the switch driving circuit is electrically connected to the charging switch and / or the discharging switch.

[0018] Fourthly, embodiments of this application also provide a battery system, including a battery and the aforementioned battery management system; the battery is electrically connected to the battery management system; wherein the battery management system is used to control the charging and / or discharging of the battery.

[0019] Fifthly, embodiments of this application also provide an electrical device, including a load and a battery system as described above; the battery system supplies power to the load.

[0020] Sixthly, embodiments of this application also provide a signal latching method applied to the above-described signal latching circuit, comprising: the first reset device sending a reset signal to the controller in response to not receiving a second signal from the controller within a first duration; and the latch latching a first signal during the controller reset. The first signal is used to control the switch to remain on during the controller reset.

[0021] In one possible implementation of the sixth aspect embodiment, the second reset device sends a reset signal to the latch in response to not receiving a second signal from the controller during the second duration.

[0022] In a seventh aspect, embodiments of this application also provide a signal latching method applied to the above-described signal latching circuit, comprising: a second reset device sending a reset signal to the latch in response to not receiving a second signal from the controller within a second duration; the latch clearing a first signal latched thereon in response to the reset signal; wherein the first signal is used to control the switch to remain on during the controller reset period. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of this application will become clearer through the accompanying drawings.

[0024] Figure 1 The diagram shows a schematic of the first signal latching circuit provided in this application connected to switch s.

[0025] Figure 2 The diagram shows a schematic of the second signal latching circuit provided in this application connected to switch s.

[0026] Figure 3 The diagram shows a schematic of the third signal latching circuit provided in this application connected to switch s.

[0027] Figure 4 A schematic diagram of the structure of a battery management system provided in an embodiment of this application is shown.

[0028] Figure 5 A flowchart illustrating the first signal latching method provided in an embodiment of this application is shown.

[0029] Figure 6 A flowchart illustrating the second signal latching method provided in an embodiment of this application is shown. Detailed Implementation

[0030] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following embodiments are provided as examples to more clearly illustrate the technical solution of this application, and should not be used to limit the scope of protection of this application. Those skilled in the art will understand that, without conflict, the following embodiments and features described herein can be combined with each other.

[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "electrical connection" can refer to a direct electrical connection or an indirect electrical connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0033] Given that current controller malfunctions, such as occasional errors due to program crashes, can directly cut off the battery's charging and / or discharging paths, thus affecting normal battery charging and / or discharging and impacting user experience, this application provides a signal latch circuit to mitigate this issue. This circuit latches a first signal used to control the conduction of switches on the battery's charging and / or discharging paths when the controller malfunctions, ensuring this first signal remains unchanged during controller reset. This prevents the direct cutting off of the battery's charging and / or discharging paths during controller malfunctions, preserving normal battery charging and / or discharging and improving user experience.

[0034] To better understand this solution, the following will combine... Figure 1 The signal latching circuit shown is described below. This signal latching circuit includes a controller, a latch, and a first reset device. The controller is electrically connected to both the latch and the first reset device. The latch is configured to be electrically connected to a switch on the charging path and / or discharging path. This switch can be a controlled switch capable of turning on or off upon receiving a control signal; for example, it can be various relays, transistor switches, IGBTs, etc.

[0035] Figure 1 The switch s can be a switch on the charging path and / or the discharging path. In some embodiments, the switch on the charging path and the switch on the discharging path can be the same switch; in other embodiments, the switch on the charging path and the switch on the discharging path can be different switches.

[0036] The controller is configured to send a first signal to the latch and a second signal to the first reset device. When the controller is in normal operating condition, it sends both the first signal and the second signal. When the controller malfunctions, it stops sending the second signal to the first reset device, or although it still sends a signal, the sent signal no longer follows the timing control logic of the second signal; in this case, the sent signal can be understood as no longer being the second signal. Similarly, when the controller malfunctions, it stops sending the first signal to the latch, or the signal sent to the latch no longer follows the timing control logic of the first signal; in this case, the sent signal can be understood as no longer being the first signal.

[0037] The controller can be an integrated circuit chip with signal processing capabilities. The aforementioned controller can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microcontroller unit (MCU) or any conventional processor.

[0038] It is understood that, in some embodiments, the first signal can be a high-level signal, which can control the switching on and / or off of the battery's charging and / or discharging paths. In other embodiments, the first signal can be a low-level signal, which can control the switching on and off of the battery's charging and / or discharging paths. Similarly, in some embodiments, the second signal can be a high-level signal, which can be used to indicate that the controller is in an operational state. In other embodiments, the second signal can be a low-level signal, which can be used to indicate that the controller is in an operational state.

[0039] The first reset device is configured to send a reset signal to the controller in response to the absence of a second signal within a first duration. Upon receiving the reset signal, the controller performs a reset, which can recover from the abnormal situation caused by the intermittent program crash. Once the controller returns to normal, it will resend the second signal to the first reset device and the first signal to the latch.

[0040] It is understood that in some embodiments, the first reset device may be considered not to have received the second signal during the first duration if any of the following conditions occur:

[0041] (i) If the first reset device does not receive a signal for a period of time exceeding the first duration, it can be assumed that the controller has not sent a signal to the first reset device. Therefore, the first reset device cannot receive the second signal within the first duration.

[0042] (ii) If the time during which the first reset device does not receive the second signal exceeds the first duration, although the first reset device can receive the signal sent by the controller, the signal is no longer the second signal.

[0043] In some embodiments, the first reset device can be a first watchdog timer. The first watchdog timer is enabled upon power-up, and the controller can implement the watchdog feeding function through level changes of the IO (Input Output) pins. Once the controller malfunctions and the watchdog feeding timeout time equals the first duration, the first watchdog timer will generate a reset signal to reset the controller.

[0044] In some other embodiments, the first reset device may be a device such as a microcontroller, configured to send a reset signal to the controller if it does not receive a second signal from the controller within a first duration.

[0045] The latch is configured to latch a first signal in response to a controller reset so that the first signal remains unchanged during the controller reset, so that even if the controller malfunctions, the control logic of the switch on the battery charging path and / or discharging path will not be changed, for example, the switch will not be controlled to perform a shutdown.

[0046] A latch can be any device with signal latching function, such as an SR (Set Reset) latch or a D (Data) latch.

[0047] Considering that when the controller experiences a permanent malfunction, such as failing to return to normal operation after a reset, it can be considered a permanent malfunction. The first reset device continuously sends a reset signal to the controller, which will remain in a reset state. This causes the switches on the battery's charging and / or discharging paths to remain in a conducting state, preventing them from being turned off and thus losing effective protection for the battery. The battery may then face safety risks such as overcharging, over-discharging, and short circuits.

[0048] To improve this problem, in some embodiments, the signal latch circuit further includes a second reset device, such as... Figure 2 As shown, the second reset device is electrically connected to the controller and the latch respectively.

[0049] The second reset device is configured to send a reset signal to the latch in response to the absence of a second signal within a second duration, thereby controlling the switch to turn off. When a permanent malfunction occurs in the controller and the malfunction lasts longer than the second duration, the second reset device controls the latch to reset, thereby turning off the switches on the charging and / or discharging paths of the battery to protect the battery, reduce the probability of overcharging and / or over-discharging, and mitigate risks such as short circuits.

[0050] In this embodiment, when the controller is in normal working condition, it will also send a second signal to the second reset device. When the controller malfunctions, it will stop sending the second signal to the second reset device, or although it will still send a signal, the sent signal will no longer comply with the timing control logic of the second signal. In this case, it can be understood that the sent signal is no longer the second signal.

[0051] It is understood that in some embodiments, the second reset device may be considered not to have received the second signal during the second duration if any of the following conditions occur:

[0052] (i) If the second reset device does not receive a signal for a period of time exceeding the second duration, it can be assumed that the controller has not sent a signal to the second reset device. Therefore, the second reset device cannot receive the second signal during the second duration.

[0053] (ii) If the second reset device does not receive the second signal for a period of time exceeding the second duration, although the second reset device can receive the signal sent by the controller, the signal is no longer the second signal.

[0054] The second duration is longer than the first duration. For example, the first duration is t, which can be configured, such as to be 5 seconds. The second duration is n*t, where n can be any number greater than or equal to 2, and the second duration is less than a duration threshold. The duration threshold is configured such that the controller enters an abnormal state after receiving a reset signal within this threshold. In some embodiments, the duration threshold can be the safe runaway time of the battery management system where the signal latch circuit is located. The safe runaway time refers to the time during which the battery management system experiences a safety failure due to the controller being in a reset state for an extended period. This time can be determined in advance through experiments; that is, n*t cannot be too large and must be an acceptable safe runaway time for the system, within which the battery will not experience a safety failure.

[0055] In some embodiments, the second reset device can be a second watchdog timer. The second watchdog timer is enabled upon power-up, and the controller can implement the watchdog feeding function through level changes of the IO (Input Output) pins. Once the controller malfunctions and the watchdog feeding timeout time equals the second duration, the second watchdog timer will send a reset signal to the latch to control the switch to perform shutdown.

[0056] In some other embodiments, the second reset device may be a device such as a microcontroller, configured to send a reset signal to the latch if a second signal is not received from the controller during a second duration.

[0057] It is understood that the first reset device and the second reset device described above may not exist simultaneously. In one possible implementation, the signal latch circuit may only include a controller, a latch, and a second reset device, as shown in the schematic diagram below. Figure 3 As shown. This is to reduce the risk that when the controller malfunctions permanently, the switches on the battery's charging and / or discharging paths will remain in a conducting state, thus losing effective protection for the battery and potentially leading to safety risks such as overcharging, over-discharging, and short circuits.

[0058] This application also provides a Battery Management System (BMS), which includes a charging switch, a discharging switch, and the aforementioned signal latching circuit. The charging switch is located on the battery's charging path, and the discharging switch is located on the battery's discharging path. The latch is electrically connected to the charging switch and / or discharging switch, managing the battery's charging and discharging by controlling the on / off state of the charging switch and / or discharging switch. For example, when the charging switch is closed, the battery can be charged; when the discharging switch is closed, the battery can be discharged. The aforementioned charging switch and / or discharging switch can be controllable switches capable of receiving control signals to turn on or off, such as various relays, transistor switches, IGBTs, etc.

[0059] In some embodiments, such as Figure 4 As shown, the battery management system also includes a switch drive circuit. The latch is electrically connected to the input terminal of the switch drive circuit, and the output terminal of the switch drive circuit is electrically connected to the charging switch and / or discharging switch. The latch is electrically connected to the charging switch and / or discharging switch through the switch drive circuit.

[0060] Understandable, Figure 4 This is only one of the many embodiments of this application, and Figure 4 This illustration only shows the case where the charging switch and the discharging switch are the same switch. In other embodiments, the charging switch and the discharging switch can be different switches.

[0061] The switch drive circuit can convert the first signal used to control the charging switch and / or discharging switch according to the requirements of the control target, so that it can drive the corresponding switch to turn on or off.

[0062] Different types of switches may require different switch drive circuits. For example, when the charging switch and / or discharging switch described above are relays, the corresponding switch drive circuit can be a relay drive circuit. When the charging switch and / or discharging switch described above are transistor switches, the corresponding switch drive circuit can be a transistor drive circuit.

[0063] Battery energy storage systems, as well as other electrical devices (powered by batteries), are typically equipped with a Battery Management System (BMS). The BMS and the battery together constitute the battery system, and the BMS is used to manage various parameters of the battery (voltage, current, temperature, etc.).

[0064] The principle and technical effects of the signal latching circuit provided in the battery management system embodiment are the same as those in the aforementioned signal latching circuit embodiment. For the sake of brevity, any parts not mentioned in the battery management system embodiment can be referred to the corresponding content in the aforementioned signal latching circuit embodiment.

[0065] This application also provides a battery system, which includes a battery and the aforementioned battery management system. The battery management system is electrically connected to the battery and is used to control the charging and / or discharging of the battery.

[0066] Currently, judging from market trends, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand for them is also constantly increasing.

[0067] During application, the battery needs to be charged and discharged, and its operation can be controlled by a battery management system. The battery can be any type of battery that can provide power, such as a lithium iron phosphate battery, a ternary lithium battery, or even a sodium-ion or magnesium-ion battery, but it is not limited to these.

[0068] The principle and technical effects of the battery management system provided in the battery system embodiment are the same as those in the aforementioned battery management system embodiment. For the sake of brevity, any parts not mentioned in the battery system embodiment can be referred to the corresponding content in the aforementioned battery management system embodiment.

[0069] This application also provides an electrical device, which includes a load and the aforementioned battery system, the battery system being used to supply power to the load. Different electrical devices correspond to different loads.

[0070] The electrical equipment can be a battery energy storage system, or it can be an electric train, electric car, ship, electric two-wheeler (such as electric car, electric bicycle, etc.), electric motorcycle, electric tricycle, etc.

[0071] The principle and technical effects of the battery system provided in the electrical equipment embodiment are the same as those in the aforementioned battery system embodiment. For the sake of brevity, any parts not mentioned in the electrical equipment embodiment can be referred to the corresponding content in the aforementioned battery system embodiment.

[0072] This application also provides a signal latching method, which can be applied to the above-mentioned... Figure 1 or Figure 2 The signal latching circuit shown below. This will be discussed in conjunction with... Figure 5 The signal latching method provided in the embodiments of this application will be described.

[0073] S1: The first reset device sends a reset signal to the controller in response to not receiving a second signal from the controller within a first duration.

[0074] When the controller is in normal working condition, it sends a first signal to the latch and a second signal to the first reset device. When the controller experiences an occasional program malfunction, it stops sending the second signal to the first reset device. If the first reset device does not receive the second signal from the controller within a first time period, it sends a reset signal to the controller to reset it.

[0075] S2: The latch responds to latching the first signal during controller reset.

[0076] To prevent the battery's charging and / or discharging paths from being directly cut off when the controller malfunctions, in this embodiment, a latch is used to latch the first signal so that the first signal remains unchanged during the controller reset, that is, the switches on the battery's charging and / or discharging paths are kept on during the controller reset.

[0077] When this signal latching method is applied to the above Figure 2 When the signal latching circuit shown also includes a second reset device, the signal latching method further includes: the second reset device sending a reset signal to the latch in response to not receiving a second signal from the controller within a second duration.

[0078] When the latching circuit also includes a second reset device, when the controller is in normal working condition, it will also send a second signal to the second reset device. If the second reset device does not receive the second signal sent by the controller within the second duration, it will send a reset signal to the latch to clear its latched first signal, thereby controlling the switches on the charging path and / or discharging path of the battery to be disconnected, so as to protect the battery, reduce the probability of overcharging and / or over-discharging, and the risk of short circuits.

[0079] This application also provides a signal latching method, which can be applied to the above-mentioned... Figure 3 The signal latching circuit shown below. This will be discussed in conjunction with... Figure 6 The signal latching method provided in the embodiments of this application will be described.

[0080] S10: The second reset device sends a reset signal to the latch in response to not receiving a second signal from the controller within a second duration.

[0081] To prevent the switches on the battery's charging and / or discharging paths from remaining in a conducting state when the controller experiences a permanent malfunction, thus failing to effectively protect the battery and potentially leading to safety risks such as overcharging, over-discharging, and short circuits, this embodiment of the application specifies that if the second reset device does not receive a second signal from the controller within a second duration, it sends a reset signal to the latch to clear its latched first signal, thereby controlling the switches on the battery's charging and / or discharging paths to open.

[0082] S20: The latch clears its latched first signal in response to the reset signal.

[0083] To prevent the switches on the battery charging and / or discharging paths from remaining in the on state in case of controller malfunction, a reset signal is sent to the latch, causing the latch to clear its latched first signal in response to the reset signal, thereby controlling the switches on the battery charging and / or discharging paths to perform shutdown.

[0084] The signal latching method provided in this application embodiment has the same implementation principle and technical effect as the aforementioned signal latching circuit embodiment. For the sake of brevity, any parts not mentioned in the signal latching method embodiment can be referred to the corresponding content in the aforementioned signal latching circuit embodiment.

[0085] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0086] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0087] 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 signal latching circuit, comprising: Controller, latch, first reset device, and second reset device; The controller is electrically connected to the latch and the first reset device respectively, and the second reset device is electrically connected to the controller and the latch respectively; The latch is configured to be electrically connected to a switch on the charging path and / or discharging path. The controller is configured to send a first signal to the latch and a second signal to the first reset device; The first signal is used to control the switch to be turned on, and the second signal is used to indicate that the controller is in a working state. The first reset device is configured to send a reset signal to the controller in response to not receiving the second signal for a first duration. The latch is configured to latch the first signal in response to a controller reset. The second reset device is configured to send a reset signal to the latch to clear the first signal latched by the latch in response to the failure to receive the second signal within a second duration, so as to control the switch to perform a shutdown.

2. The signal latching circuit according to claim 1, wherein the first reset device is a first watchdog timer.

3. The signal latching circuit according to claim 1, wherein, The second duration is greater than the first duration.

4. The signal latching circuit according to claim 3, wherein the second duration is less than a duration threshold; in, The duration threshold is configured such that within the duration threshold, the controller is in an abnormal state after receiving the reset signal.

5. The signal latching circuit according to claim 3 or 4, wherein the second reset device is a second watchdog timer.

6. A signal latching circuit, comprising: Controller, latch, and second reset device; The controller is electrically connected to the latch and the second reset device respectively, and the second reset device is also electrically connected to the latch. The latch is configured to be electrically connected to a switch on the charging path and / or discharging path. The controller is configured to send a first signal to the latch and a second signal to the second reset device, wherein the first signal is used to control the switch to be turned on, and the second signal is used to indicate that the controller is in an operating state. The latch is configured to latch the first signal in response to a controller reset. The second reset device is configured to send a reset signal to the latch to clear the first signal latched by the latch in response to not receiving the second signal from the controller within a second duration, so as to control the switch to perform a shutdown.

7. A battery management system, comprising a charging switch and a discharging switch, and a signal latching circuit as described in any one of claims 1 to 6; in, The latch is electrically connected to the charging switch and / or the discharging switch.

8. The battery management system according to claim 7, further comprising: Switch drive circuit, The latch is electrically connected to the input terminal of the switch driving circuit, and the output terminal of the switch driving circuit is electrically connected to the charging switch and / or the discharging switch.

9. A battery system comprising a battery and a battery management system as described in claim 7 or 8; The battery is electrically connected to the battery management system; in, The battery management system is used to control the charging and / or discharging of the battery.

10. An electrical appliance, comprising a load and a battery system as claimed in claim 9; The battery system supplies power to the load.

11. A signal latching method, applied to a signal latching circuit as described in any one of claims 1-5, comprising: The first reset device sends a reset signal to the controller in response to not receiving a second signal from the controller within the first duration. The latch responds to latching a first signal during controller reset; The first signal is used to control the switch to remain on during the controller reset.

12. The method of claim 11, further comprising: The second reset device sends a reset signal to the latch in response to not receiving a second signal from the controller during the second duration.

13. A signal latching method, applied to the signal latching circuit as described in claim 6, comprising: The second reset device sends a reset signal to the latch in response to not receiving a second signal from the controller during the second duration; The latch, in response to the reset signal, clears the first signal it has latched; The first signal is used to control the switch to remain on during the controller reset.

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