Battery management device, battery device and electric equipment

Abstract

The utility model provides a battery management device, a battery device and electric equipment, the battery management device comprises a monitoring module, a switch module, a pre-charging module and a main control module, the monitoring module is configured to be electrically connected to a first power interface so as to obtain power supply voltage from the first power interface; the main control module is electrically connected to the monitoring module, the switch module and the pre-charging module; wherein when the first power interface is in a power-down state, the monitoring module is in a non-working state or outputs a first indication signal, and the main control module is configured to execute resetting based on the non-working state of the monitoring module and the first indication signal. The monitoring module is in a non-working state or outputs a first indication signal when the first power interface is in a power-down state to inform the main control module to execute resetting, and after the main control module executes resetting and the voltage of the first power interface is recovered, the main control module firstly controls the pre-charging module to be closed, so that damage to the switch module is reduced, and the service life of the switch module is prolonged. The reliability of the battery management device and the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery management device, a battery device, and an electrical appliance. Background Technology

[0002] The vehicle's battery pack powers the electrical equipment on board. The main power supply circuit typically includes a switching module to control its on / off state. This switching module receives a power interface from the battery pack to power its drive units. If the power interface fails to output a normal voltage, it may cause the switching module's state to change, for example, switching from closed to open. If the switching module closes immediately after the power interface's output voltage returns to normal, it can cause a large surge voltage across the module, potentially damaging it. Utility Model Content

[0003] This application proposes a battery management device, a battery device, and an electrical device that can improve the problem of surge voltage generated across the switching module after the output voltage of the power interface returns to normal, which can damage the switching module, thereby improving the reliability of the battery management device and the battery device.

[0004] According to one aspect of this application, a battery management device is disclosed, comprising: a monitoring module, a switching module, a pre-charge module, and a main control module. The monitoring module is configured to be electrically connected to a first power interface to obtain a power supply voltage from the first power interface; the switching module is configured to be electrically connected to the first power interface to obtain a drive voltage from the first power interface and form a main power supply circuit for the load; the pre-charge module is configured to be electrically connected to the first power interface to obtain a drive voltage from the first power interface and form a pre-charge circuit connected in parallel with the main power supply circuit; the main control module is electrically connected to the monitoring module, the switching module, and the pre-charge module; wherein, when the first power interface is in a power-off state, the monitoring module is in a non-operating state or outputs a first indication signal, and the main control module is configured to perform a reset based on the non-operating state of the monitoring module and the first indication signal. Since the first power interface is used to provide drive voltage for the switching module, when the first power interface fails to power down, it can no longer support the switching module to maintain its original closed state and will enter the cut-off state. When the voltage of the first power interface is restored, the switching module directly switches from the cut-off state to the closed state, which will cause a large surge voltage to be generated across the switching module and thus damage the switching module. In this application, a monitoring module is electrically connected to the main control module. When the first power interface is in a power-down state, the monitoring module is in a non-working state or outputs a first indication signal to promptly notify the main control module to perform a reset. After the main control module performs a reset, when the voltage of the first power interface is restored, the main control module will first control the pre-charge module to close. Through the pre-charge circuit, the voltage difference across the switching module is reduced, and then the switching module is closed. Therefore, the possibility of generating a large surge voltage across the switching module is reduced, thereby reducing damage to the switching module and improving the reliability of the battery management device and the battery device.

[0005] In some embodiments, the main control module further includes a second indication signal output terminal, and the monitoring module includes a second indication signal receiving terminal. The second indication signal output terminal is connected to the second indication signal receiving terminal of the monitoring module. The second indication signal output terminal is configured to periodically send a second indication signal to the monitoring module at predetermined time intervals. The second indication signal is used to indicate that the main control module is working normally. The monitoring module also includes a first indication signal output terminal, and the main control module also includes a first indication signal receiving terminal. The first indication signal output terminal is configured to output a first indication signal when no second indication signal is received within a predetermined time period. By having the main control module periodically send a second indication signal to the monitoring module at predetermined time intervals, and the monitoring module can output a first indication signal when no second indication signal is received within a predetermined time period, the monitoring module can monitor whether the main control module is working normally, and reset the main control module through the first indication signal when the main control module is not working normally, thereby further improving the reliability of the battery management device and the battery device.

[0006] In some embodiments, the monitoring module includes a first indication signal output terminal, and the main control module includes a first indication signal receiving terminal, with the first indication signal output terminal connected to the first indication signal receiving terminal. The monitoring module is configured to output a first indication signal through the first indication signal output terminal when no power supply voltage is received. By outputting the first indication signal when the monitoring module does not receive power supply voltage, the monitoring module can promptly notify the main control module and reset it when a power failure occurs at the first power interface, thereby further improving the reliability of the battery management device and the battery device.

[0007] In some embodiments, the monitoring module includes a watchdog chip, and the main control module includes a microcontroller unit (MCU), which is electrically connected to the watchdog chip. This embodiment implements the monitoring module and the main control module using a watchdog chip and an MCU, resulting in a simple structure, small size, and improved circuit integration.

[0008] In some embodiments, the switching module further includes a relay configured to remain closed for a preset holding time after the first power interface is powered off. This embodiment implements the switching module using a relay, and the relay remains closed for a preset holding time after the first power interface is powered off, which can improve the problem of vehicles suddenly losing power and being unable to drive normally, thus threatening driving safety.

[0009] In some embodiments, the main control module is electrically connected to a second power interface, which supplies power to the main control module. In this embodiment, the main control module and the monitoring module are powered by the second power interface and the first power interface, respectively. Therefore, when the first power interface is powered off, the second power interface still works normally, meaning the main control module is unaffected, which further improves the reliability of the battery management device and the battery device.

[0010] In some embodiments, the monitoring module includes a watchdog chip; the main control module includes an MCU; wherein the watchdog chip and a relay are connected to a first power interface to obtain a supply voltage from the first power interface; the MCU is electrically connected to a second power interface to obtain a supply voltage from the second power interface; the MCU is connected to the watchdog chip to obtain a first indication signal or the watchdog chip's non-operating state, and the MCU is configured to perform a reset based on the first indication signal or the watchdog chip's non-operating state. This embodiment implements the monitoring module and the main control module using a watchdog chip and an MCU, resulting in a simple structure, small size, and improved circuit integration.

[0011] In some embodiments, the switching module includes a first conducting terminal, a second conducting terminal, and a driving unit. The driving unit is electrically connected to a first power interface and obtains a driving voltage from the first power interface to drive the switching module to close or open. One end of the pre-charge module is electrically connected to the first conducting terminal, and the other end is electrically connected to the second conducting terminal. In this embodiment, the driving unit of the switching module obtains the driving voltage from the first power interface and shares the same voltage source as the monitoring module. Therefore, no new power supply is needed, the circuit structure is simple, and it is beneficial to further reduce the size.

[0012] In some embodiments, the drive unit is also connected to the main control module and receives an enable signal from the main control module. In this embodiment, the main control module is connected to the drive unit of the switch module and can send an enable signal to the drive unit, thus enabling the main control module to control the switch module.

[0013] To address the aforementioned issues, this application provides a battery device comprising the aforementioned battery management device. Since the first power interface provides drive voltage to the switching module, when a power failure occurs at the first power interface, it can no longer support the switching module in maintaining its original switching state. Furthermore, when the voltage of the first power interface recovers, the direct closure of the switching module will result in a large surge voltage across the switching module, potentially damaging it. This application adds a monitoring module and a main control module, with the monitoring module electrically connected to the main control module. When the first power interface is in a power-off state, the monitoring module is either in a non-operating state or outputs a first indication signal to promptly notify the main control module to perform a reset. After the main control module performs the reset, upon recovery of the first power interface voltage, the main control module first controls the pre-charge module to close. Through the pre-charge circuit, the voltage difference across the switching module is reduced before closing the switching module, reducing the likelihood of a large surge voltage across the switching module and thus minimizing damage to the switching module. This improves the reliability of the battery management device and the battery device as a whole.

[0014] To address the aforementioned problems, this application provides an electrical device comprising the aforementioned battery device. Since the first power interface provides driving voltage to the switching module, when a power failure occurs at the first power interface, it can no longer support the switching module in maintaining its original switching state. When the voltage of the first power interface recovers, the direct closure of the switching module will cause a large surge voltage across the switching module, potentially damaging it. This application adds a monitoring module and a main control module, with the monitoring module electrically connected to the main control module. When the first power interface is in a power-off state, the monitoring module is either in a non-operating state or outputs a first indication signal to promptly notify the main control module to perform a reset. After the main control module performs the reset, upon recovery of the first power interface voltage, the main control module first controls the pre-charge module to close. Through the pre-charge circuit, the voltage difference across the switching module is reduced before the switching module is closed, reducing the likelihood of a large surge voltage across the switching module and thus minimizing damage to the switching module. This improves the reliability of the battery management device and the battery device.

[0015] Unlike existing technologies, the battery management device provided in this application includes a monitoring module electrically connected to the main control module and the first power interface to obtain power supply voltage from the first power interface. The switching module is also configured to be electrically connected to the first power interface to obtain drive voltage from it. Therefore, the monitoring module and the switching module share a power supply. When the first power interface is powered off, the monitoring module is in a non-operating state or outputs a first indication signal to cause the main control module to perform a reset. After the main control module is reset, the switching module will not close directly when the first power interface is powered on again. Instead, the main control module first controls the pre-charge module to close, reducing the voltage difference across the switching module through the pre-charge circuit before closing the switching module. This reduces the possibility of surge voltage damaging the switching module, thus improving the reliability of the battery management device and the battery assembly. Attached Figure Description

[0016] Various other advantages and benefits will become clear from the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the main power supply circuit for the vehicle's load.

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the electrical equipment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of an embodiment of the battery device of this application;

[0020] Figure 4 This is a schematic diagram of the structure of an embodiment of the battery management device of this application;

[0021] Figure 5 This is a schematic diagram of the structure of one embodiment of the main control module and monitoring module of this application;

[0022] Figure 6 This is a schematic diagram of signal interaction between the main control module and the monitoring module of this application in another embodiment;

[0023] Figure 7 This is a schematic diagram of the signal interaction between the watchdog chip and the MCU in one embodiment of this application;

[0024] Figure 8 This is a schematic diagram of signal interaction in another embodiment of the main control module and monitoring module of this application;

[0025] Figure 9 This is a schematic diagram of another embodiment of the battery management device of this application;

[0026] The reference numerals in the detailed embodiments are as follows: Battery cell group BAT; Main positive relay CB1; Precharge relay CB2; Main negative relay CB3; Precharge resistor R1; Precharge capacitor C1; Load Z; Vehicle 1000a; Battery device 100a; Controller 200a; Motor 300a; Battery cell 1, Battery box 10a; First part 11a; Second part 12a; Battery management device 400; Monitoring module 410; Switch module 420; Precharge module 430; Main control module 440; First power interface P1; Watchdog chip 710; MCU 720; Second power interface P2; First conducting terminal T1; Second conducting terminal T2; Drive unit 910; Relay 920. Detailed Implementation

[0027] To better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. 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. Please refer to... Figure 1 , Figure 1This is a schematic diagram of the main power supply circuit for the vehicle's load. The battery cell group BAT can form a main power supply circuit to supply power to the load Z through switching modules, such as the main positive relay CB1 and the main negative relay CB3. The main positive relay CB1, the main negative relay CB3, and the precharge relay CB2 can obtain driving voltage from the first power interface P1 (e.g., the power interface from the vehicle's lead-acid battery unit) (as shown by the dotted line in the diagram) to drive the opening or closing of the main positive relay CB1, the main negative relay CB3, and the precharge relay CB2. When the first power interface P1 is de-energized, the main positive relay CB1 and the main negative relay CB3 disconnect due to the loss of driving voltage, thereby disconnecting the main power supply circuit for the load Z. At this time, the precharge capacitor C1 will begin to release the charge stored in the main power supply circuit when it is closed. The longer the first power interface P1 remains in a power-off state, the greater the voltage discharged by the pre-charge capacitor C1, and the greater the energy consumed by the load Z. If the first power interface P1 is restored to power at this time, and the main positive relay CB1 and the main negative relay CB3 are directly closed without first charging the pre-charge capacitor C1 through the pre-charge relay CB2, a large surge voltage will be generated, which will damage the aforementioned relays, such as causing the relays to stick together.

[0034] Based on the above considerations, in order to improve the problem of surge voltage generated across the switching module after the power interface output voltage returns to normal, causing damage to the switching module, this application proposes a battery management device. The battery management device includes a monitoring module electrically connected to the main control module and the first power interface to obtain the supply voltage from the first power interface; the switching module is also configured to be electrically connected to the first power interface to obtain the drive voltage from the first power interface; therefore, the monitoring module and the switching module share a power supply; when the first power interface is in a power-off state, the monitoring module is in a non-operating state or outputs a first indication signal to cause the main control module to perform a reset. After the main control module is reset, the switching module will not close directly when the first power interface resumes power supply. Instead, the main control module first controls the pre-charge module to close, reducing the voltage difference across the switching module through the pre-charge circuit before closing the switching module. This reduces the possibility of surge voltage generated across the switching module and damaging it, thus improving the reliability of the battery management device and the battery assembly.

[0035] The battery management device provided in this application can be used in electrical equipment with battery devices, such as vehicles, energy storage systems, and mobile devices.

[0036] Please refer to Figure 2Vehicle 1000a can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100a is installed inside vehicle 1000a, which can be located at the bottom, front, or rear of vehicle 1000a. Battery device 100a can be used to power vehicle 1000a; for example, battery device 100a can serve as the operating power source for vehicle 1000a. Vehicle 1000a may also include a controller 200a and a motor 300a. Controller 200a is used to control the battery device 100a to supply power to motor 300a, for example, to meet the power needs of vehicle 1000a during starting, navigation, and driving.

[0037] In some embodiments of this application, the battery device 100a can not only serve as the operating power source for the vehicle 1000a, but also as the driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0038] In some embodiments, the battery device 100a may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0039] In some embodiments, as Figure 3 As shown, the battery device 100a includes a battery housing 10a and a battery cell 1, with the battery cell 1 or battery module housed in the battery housing 10a.

[0040] In some embodiments, the battery housing 10a may be part of the chassis structure of the vehicle 1000a. For example, a portion of the battery housing 10a may be at least a portion of the floor of the vehicle 1000a, or a portion of the battery housing 10a may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000a.

[0041] Please refer to Figure 3The battery device 100a includes a battery housing 10a and a battery cell 1, with the battery cell 1 housed within the battery housing 10a. The battery housing 10a provides a space for the battery cell 1 and can have various structures. In some embodiments, the battery housing 10a may include a first portion 11a and a second portion 12a, which overlap each other, together defining a space for accommodating the battery cell 1. The second portion 12a may be a hollow structure with one open end, and the first portion 11a may be a plate-like structure, covering the open side of the second portion 12a so that the first portion 11a and the second portion 12a together define the space. Alternatively, both the first portion 11a and the second portion 12a may be hollow structures with one open side, with the open side of the first portion 11a covering the open side of the second portion 12a. Of course, the battery box 10a formed by the first part 11a and the second part 12a can be of various shapes, such as cylinder, cuboid, etc.

[0042] In the battery device 100a, a single battery cell 1 can be multiple battery cells, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 1 are connected in both series and parallel connections. Multiple battery cells 1 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 1 is housed within the battery casing 10a. Alternatively, the battery device 100a can also consist of multiple battery cells 1 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the battery casing 10a. The battery device 100a may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 1. The battery device 100a also includes a battery management device 400 for monitoring and managing the status of the battery device 100a. The battery management device 400 communicates with the vehicle controller, i.e., controller 200a, via the CAN bus, reports the status parameters of the battery device 100a, receives instructions from the vehicle controller, and determines the power output in accordance with the needs of the vehicle. At the same time, the battery management device 400 is also used to monitor the operating status of the entire battery device 100a, protect the battery device 100a from abnormal operating conditions such as over-discharge and overheating, etc.

[0043] Please refer to Figure 4The battery management device 400 provided in this application includes a monitoring module 410, a switch module 420, a precharge module 430, and a main control module 440. The monitoring module 410 is configured to be electrically connected to a first power interface P1 to obtain a power supply voltage from the first power interface P1. The switch module 420 is configured to be electrically connected to the first power interface P1 to obtain a drive voltage from the first power interface P1 and forms a main power supply circuit for load Z. The precharge module 430 is configured to be electrically connected to the first power interface P1 to obtain a drive voltage from the first power interface P1 and forms a precharge circuit connected in parallel with the main power supply circuit. The main control module 440 is electrically connected to the monitoring module 410, the switch module 420, and the precharge module. When the first power interface P1 is in a power-off state, the monitoring module 410 is in a non-working state or outputs a first indication signal. The main control module 440 is configured to perform a reset based on the non-working state of the monitoring module 410 and the first indication signal. Since the first power interface P1 is used to provide drive voltage for the switch module 420, when the first power interface P1 experiences a power failure, it can no longer support the switch module 420 to maintain its original switching state. When the voltage of the first power interface P1 is restored, the switch module 420 will close directly, resulting in a large surge voltage across the switch module 420 and potentially damaging it. This application adds a monitoring module 410 and a main control module 440, with the monitoring module 410 electrically connected to the main control module 440. The monitoring module 410 operates when the first power interface P1 is in a power-off state. When the device is in a non-working state or outputs the first indication signal, it promptly notifies the main control module 440 to perform a reset. After the main control module 440 performs the reset, once the voltage of the first power interface P1 is restored, the main control module 440 will first control the pre-charge module 430 to close. Through the pre-charge circuit, the voltage difference across the switch module 420 is reduced, and then the switch module 420 is closed. This reduces the possibility of generating a large surge voltage across the switch module 420, thereby reducing the damage to the switch module 420 and improving the reliability of the battery management device 400 and the battery device.

[0044] Different switching modules 420 can be selected to suit different application scenarios. For example, a suitable switching module 420 can be determined based on parameters such as the voltage of the main power supply circuit of the load Z. The switching module 420 may include a relay, a field-effect MOSFET, a transistor, a thyristor, or an integrated circuit that implements the switching function. When the switching module 420 includes a relay, a large surge voltage is generated across the switching module 420. The huge voltage may cause the relay contacts to melt and stick together, thus preventing the relay from performing its switching function normally and affecting the reliability of the battery management device 400 and the battery device. This application uses a monitoring module 410 to monitor the first power interface P1 when it is in a power-off state, either in a non-working state or by outputting a first indication signal. This promptly notifies the main control module 440 to perform a reset. After the main control module 440 performs the reset, once the voltage at the first power interface P1 is restored, it first controls the pre-charge module 430 to close. Through the pre-charge circuit, the voltage difference across the switch module 420 is reduced. Then, the switch module 420 is closed, reducing the possibility of large surge voltages across the switch module 420. This reduces the possibility of relay contacts sticking together, thereby improving the reliability of the battery management device 400 and the battery device.

[0045] For ease of understanding, this article will use the example of a switch module 420 including a relay.

[0046] Similar to the switch module 420, the precharge module 430 may also have a drive unit (or control unit, etc., not shown in the figure). The first power interface P1 provides a drive voltage to the precharge module 430 to power the drive unit in the precharge module 430, so that the drive unit generates a drive signal to control the precharge module 430 to turn on or off, thereby controlling the on / off state of the precharge circuit. Furthermore, different precharge modules can be selected to suit different application scenarios; please refer to the previous description of the switch module 420 for details.

[0047] The main control module 440 is electrically connected to the monitoring module 410, the switch module 420, and the pre-charge module. When the first power interface P1 is in a power-off state, the monitoring module 410 is in a non-working state or outputs a first indication signal. The main control module 440 is configured to perform a reset based on the non-working state of the monitoring module 410 and the first indication signal. That is, the main control module 440 can obtain electrical signals from the monitoring module 410 and then perform a reset operation based on the electrical signals provided by the monitoring module 410. After the main control module 440 performs a reset operation, it can turn on the pre-charge module 430 and the switch module 420 in sequence. That is, the pre-charge module 430 is turned on first to close the pre-charge circuit, and then the switch module 420 is closed to close the main power supply circuit.

[0048] For example, after the main control module 440 performs a reset operation, it can send enable signals to the switch module 420 and the precharge module 430 sequentially. Specifically, the main control module 440 can be electrically connected to the enable terminals of the switch module 420 and the precharge module 430. After the reset, the main control module 440 can first send an enable signal to the precharge module 430, thereby activating the drive unit of the precharge module 430. This allows the drive unit of the precharge module 430 to drive the precharge module 430 to close under the excitation of the drive voltage provided by the first power interface P1, thus closing the precharge circuit. Furthermore, the main control module 440 can choose not to send an enable signal to the enable terminal of the switch module 420 while sending the enable signal to the precharge module 430. Therefore, even if the first power interface P1 can provide a normal drive voltage to the switch module 420, the drive unit of the switch module 420 will not drive the switch module 420 to close, and thus the main power supply circuit will not be closed. After the pre-charge circuit is closed for a period of time, the main control module 440 can stop sending enable signals to the pre-charge module 430 and send enable signals to the switch module 420. Therefore, the pre-charge module 430 will not close even if it obtains normal drive voltage from the first power interface P1, while the switch module 420 can close when the first power interface P1 provides normal drive voltage.

[0049] The first power interface P1 is in a power-off state, including the state in which the first power interface P1 cannot provide the voltage that enables the monitoring module 410, the switch module 420, and the precharge module 430 to work normally. For example, the voltage provided by the first power interface P1 drops to one-third, one-half, or zero of the normal voltage.

[0050] In some embodiments, the monitoring module 410 includes a detection circuit (not shown). The detection circuit may include a comparator, an operational amplifier, or an integrated circuit with current or voltage detection functions. For example, the voltage detection circuit may include a comparator. One input terminal of the comparator may be connected to the first terminal of the detection circuit, and the other input terminal of the comparator may be connected to a reference voltage, such as the normal output voltage of the first power interface P1. The output terminal of the comparator is connected to the main control module 440. Therefore, when the first power interface P1 is in a power-off state, the comparator can output a first indication signal. The power input terminal of the comparator may also be connected to the first power interface P1 to obtain the power supply voltage from the first power interface P1. Thus, when the power supply voltage provided by the first power interface P1 cannot support the normal operation of the comparator, the output terminal of the comparator can also generate a corresponding indication signal to indicate that it is in a non-working state, such as generating a logic low-level signal.

[0051] In some embodiments, please refer to Figure 5The main control module 440 also includes a second indication signal output terminal, and the monitoring module 410 includes a second indication signal receiving terminal. The second indication signal output terminal is connected to the second indication signal receiving terminal of the monitoring module 410. The second indication signal output terminal is configured to periodically send a second indication signal to the monitoring module 410 at predetermined time intervals. The second indication signal is used to indicate that the main control module 440 is working normally. The monitoring module 410 also includes a first indication signal output terminal, and the main control module 440 also includes a first indication signal receiving terminal. The first indication signal output terminal is configured to output a first indication signal when no second indication signal is received within a predetermined time period.

[0052] The monitoring module 410 may be an integrated circuit with timing function, for example, the monitoring module 410 may have a clock unit (not shown) and a counting unit (not shown). The clock unit can generate a clock signal, and the counting unit is connected to the clock unit to receive the clock signal and can count the clock signal to realize the timing function. The counting unit is connected to a second indication signal receiving terminal. If the second indication signal is received within a predetermined threshold of the counting unit, the counting unit is reset and counts again. If the counting unit does not receive the second indication signal within the predetermined threshold, the first indication signal is output through the first indication signal output terminal.

[0053] In this embodiment, the main control module 440 periodically sends a second indication signal to the monitoring module 410 at predetermined time intervals. When the monitoring module 410 does not receive the second indication signal within the predetermined time, it outputs a first indication signal, thereby causing the main control module 440 to perform a reset. Therefore, the monitoring module 410 can also monitor whether the main control module 440 is operating normally, and reset the main control module 440 when it fails to operate normally, thereby restoring the main control module 440 to normal operation and improving the reliability of the battery management device 400 and the battery device.

[0054] In some embodiments, please refer to Figure 6 The monitoring module 410 includes a first indication signal output terminal, and the main control module 440 includes a first indication signal receiving terminal. The first indication signal output terminal is connected to the first indication signal receiving terminal. The monitoring module 410 is configured to output a first indication signal through the first indication signal output terminal when no power supply voltage is received.

[0055] The monitoring module 410 can be an integrated circuit with voltage or current detection capability or a circuit module including discrete components such as comparators and resistors. The monitoring module 410 can monitor the voltage or current of the first power interface P1 and output a corresponding first indication signal at the first indication signal output terminal according to the voltage or current of the first power interface P1. The first indication signal can include a logic high-level signal or a logic low-level signal. Taking the first indication signal as a logic low-level signal as an example, when the voltage output by the first power interface P1 is 0 or cannot support the normal operation of the monitoring module 410, it is considered that the monitoring module 410 has not received a power supply voltage, that is, the monitoring module 410 has lost power supply, so there is no voltage output at the first indication signal output terminal, which is manifested as a logic low level. When the first indication signal receiving terminal of the main control module 440 detects the logic low level, it performs a reset.

[0056] In some embodiments, please refer to Figure 7 The monitoring module 410 includes a watchdog chip 710, and the main control module 440 includes an MCU 720, which is electrically connected to the watchdog chip 710. As shown in the figure, the watchdog chip 710 includes a first indicator signal output terminal and a second indicator signal receiving terminal, and the MCU 720 includes a first indicator signal receiving terminal and a second indicator signal output terminal. When the MCU 720 is working normally, it sends a second indicator signal to the watchdog chip 710 at regular intervals. If no signal is sent for a certain period, the watchdog chip 710 outputs a first indicator signal to the MCU 720, causing the MCU 720 to reset.

[0057] As is easily understood, the watchdog chip 710 is connected to an I / O pin (i.e., the second indicator signal output terminal) of the MCU720. This I / O pin is controlled by the program to periodically send a high level (or low level) to this pin of the watchdog. This program statement is scattered among other control statements of the MCU720. Once the MCU720 enters an infinite loop state due to interference causing the program to run away, the program on this I / O pin cannot be executed. At this time, the watchdog chip 710 will send a reset signal (i.e., the first indicator signal output terminal) to the pin (i.e., the first indicator signal output terminal) connected to the MCU720 reset pin (i.e., the first indicator signal receiving terminal) because it cannot receive the signal from the MCU720. This causes the MCU720 to reset, that is, the program starts executing from the beginning of the program memory, thus realizing the automatic reset of the MCU720.

[0058] In some embodiments, the switch module 420 further includes a relay 920, which is configured to remain closed for a preset holding time after the first power interface P1 is in a power-off state. Therefore, when the first power interface P1 experiences a power-off fault, the switch module 420 will not immediately disconnect the main power supply circuit of the load Z, so that the load Z can still be powered normally and maintain normal operation within the preset holding time, thus preventing dangerous situations caused by sudden power outages. For example, when the battery management device 400 is used for vehicle battery cell pack (BAT) management, it can maintain normal vehicle operation for a preset holding time after the first power interface P1 experiences a power-off fault, allowing the driver as much time as possible to drive to a safe area. The preset holding time is longer than a predetermined time interval.

[0059] In some embodiments, please refer to Figure 8 The main control module 440 is electrically connected to the second power interface P2, which supplies power to the main control module 440. In this embodiment, the main control module 440 and the monitoring module 410 are powered by different power interfaces. When the first power interface P1 is in a power-off state, the second power interface P2 can still supply power to the main control module 440, thus maintaining the normal operation of the main control module 440. This allows the main control module to control the pre-charge module 430 and the switch module 420 to close sequentially after a reset. Therefore, when the first power interface P1 is in a power-off state, the second power interface P2 still operates normally, meaning the main control module 440 is unaffected, further improving the reliability of the battery management device 400 and the battery device. In some embodiments, the monitoring module 410 includes a watchdog chip 710; the main control module 440 includes an MCU 720; wherein the watchdog chip 710 and the relay 920 are connected to a first power interface P1 to obtain a power supply voltage from the first power interface P1; the MCU 720 is electrically connected to a second power interface P2 to obtain a power supply voltage from the second power interface P2; the MCU 720 is connected to the watchdog chip 710 to obtain a first indication signal or the non-operating state of the watchdog chip 710, and the MCU is configured to perform a reset based on the first indication signal or the non-operating state of the watchdog chip 710. This embodiment implements the monitoring module 410 and the main control module 440 using the watchdog chip 710 and the MCU 720, resulting in a simple structure, small size, and improved circuit integration.

[0060] In some embodiments, please refer to Figure 9The switch module 420 includes a relay 920 and a drive unit 910. The relay 920 includes a first conducting terminal T1 and a second conducting terminal T2. The drive unit 910 is electrically connected to a first power interface P1 and obtains a drive voltage from the first power interface P1 to drive the switch module 420 to close or open. One end of the pre-charge module 430 is electrically connected to the first conducting terminal T1, and the other end is electrically connected to the second conducting terminal T2. In this embodiment, the drive unit 910 of the switch module 420 obtains the drive voltage from the first power interface P1 and shares the same voltage source as the monitoring module 410. Therefore, no new power supply is needed, the circuit structure is simple, and it is beneficial to further reduce the size.

[0061] In some embodiments, the first conducting terminal T1 is used to connect to a battery device (not shown), and the second conducting terminal T2 is used to connect to a load (not shown).

[0062] In some embodiments, the drive unit 910 is also connected to the main control module 440 and receives an enable signal from the main control module 440. In this embodiment, the main control module is connected to the drive unit of the switch module and can send an enable signal to the drive unit, thus enabling the main control module to control the switch module.

[0063] The precharge module 430 also has a drive unit 910 and a relay 920, the relay 920 including a third conducting terminal and a fourth conducting terminal. The precharge module 430 and the switch module 420 can share a drive unit 910, which can be used to drive the relays 920 of the precharge module 430 and the switch module 420 respectively; the precharge module 430 and the switch module 420 can also use different drive units 910.

[0064] The following combination Figure 1 and Figure 9 The working principle of the battery management device of this application is illustrated by example:

[0065] like Figure 9The monitoring module 410 is powered by the first power interface P1. When the monitoring module 410 does not receive the power supply voltage provided by the first power interface P1, the monitoring module 410 enters a non-working state. The main control module 440 can determine whether the monitoring module 410 is in a working state based on the level state of the pin connected to the monitoring module 410. For example, if the pin connected to the main control module 440 and the monitoring module 410 is at a logic low level, it is determined that the monitoring module 410 is in a non-working state, indicating that the first power interface P1 is in a power-off state, and the main control module 440 performs a reset. In addition, the main control module 440 can also periodically send a second indication signal to the monitoring module 410 at predetermined time intervals. If the monitoring module 410 receives the second indication signal within the predetermined time, it indicates that the main control module 440 is still working normally. If the monitoring module 410 does not receive the second indication signal within the predetermined time, it indicates that the main control module 440 is not working normally. Therefore, the monitoring module 410 outputs a first indication signal to make the main control module 440 perform a reset. After the main control module 440 performs a reset, it can control the precharge module 430 and the switch module 420 to close in the order of closing the precharge module 430 first and then closing the switch module 420. For example, after the main control module 440 performs a reset operation, it can send enable signals to the switch module 420 and the precharge module 430 in sequence. Specifically, the main control module 440 can be electrically connected to the enable terminals of the drive units 910 of the switch module 420 and the precharge module 430, respectively. After reset, the main control module 440 can first send an enable signal to the drive unit 910 of the precharge module 430, thereby activating the drive unit 910 of the precharge module 430. This allows the drive unit 910 of the precharge module 430 to drive the relay 920 of the precharge module 430 to close under the excitation of the drive voltage provided by the first power interface P1, thus closing the precharge circuit. Furthermore, the main control module 440 can choose not to send an enable signal to the enable terminal of the drive module of the switch module 420 while sending the enable signal to the precharge module 430. Therefore, even if the first power interface P1 can provide a normal drive voltage to the drive unit 910 of the switch module 420, the drive unit 910 of the switch module 420 will not drive the switch module 420 to close, thus preventing the main power supply circuit from closing. After the pre-charge circuit is closed for a period of time, the main control module 440 can stop sending enable signals to the drive unit 910 of the pre-charge module 430 and send enable signals to the drive unit 910 of the switch module 420. Therefore, the pre-charge module 430 will not close even if it obtains normal drive voltage from the first power interface P1, while the switch module 420 can close when the first power interface P1 provides normal drive voltage.

[0066] like Figure 1The switching module 420 includes a main positive relay CB1, while the precharge module 430 includes a precharge relay CB2. After the main control module 440 performs a reset, it first closes the precharge relay CB2. At this time, the main positive relay CB1 is open, and the battery cell group BAT supplies power to the precharge capacitor C1 and the load Z through the precharge circuit. Due to the presence of the precharge resistor R1, the precharge circuit can limit the voltage across the precharge relay CB2 and the current flowing through the precharge relay CB2. As the precharge capacitor C1 charges, the voltage across the main positive relay CB1 gradually decreases. At this time, the main control module 440 controls the main positive relay CB1 to close, which can reduce the possibility of surge voltage being generated across the main positive relay CB1 and causing the relay 920 to stick.

[0067] Therefore, this application uses the monitoring module 410 to either be in a non-working state or output a first indication signal when the first power interface P1 is in a power-off state, to promptly notify the main control module 440 to perform a reset. After the main control module 440 performs the reset, once the voltage of the first power interface P1 is restored, the main control module 440 will first control the pre-charge module 430 to close. Through the pre-charge circuit, the voltage difference across the switch module 420 is reduced, and then the switch module 420 is closed. This reduces the possibility of generating a large surge voltage across the switch module 420, thereby reducing the possibility of the relay 920 contacts sticking together, and thus improving the reliability of the battery management device and the battery device.

[0068] This application further proposes a battery device 100a, including a battery housing 10a, a battery cell 1, and a battery management device 400. The battery housing 10a has a receiving space; the battery cell 1 is disposed in the receiving space; and the battery management device 400 is disposed in the receiving space, so as to improve the reliability of the battery management device 400 and the reliability of its data interaction and storage with other components in the battery device 100a, thereby improving the reliability of the battery device 100a.

[0069] The description of the battery management device 400 can be found in the above embodiments. Based on this, since the first power interface P1 is used to provide drive voltage to the switching module 420, when the first power interface P1 experiences a power failure, it can no longer support the switching module 420 in maintaining its original switching state. When the voltage of the first power interface P1 recovers, the direct closure of the switching module 420 will cause a large surge voltage across the switching module 420, thereby damaging the switching module 420. This application adds a monitoring module 410 and a main control module 440, and the monitoring module 410 is electrically connected to the main control module 440. The monitoring module 410 in the... When the power interface P1 is in a power-off state, it is either in a non-working state or outputs a first indication signal, promptly notifying the main control module 440 to perform a reset. After the main control module 440 performs the reset, once the voltage of the first power interface P1 is restored, the main control module 440 will first control the pre-charge module 430 to close. Through the pre-charge circuit, the voltage difference across the switch module 420 is reduced, and then the switch module 420 is closed. This reduces the possibility of generating a large surge voltage across the switch module 420, thereby reducing damage to the switch module 420 and improving the reliability of the battery management device 400 and the battery device.

[0070] This application further proposes an electrical device including the aforementioned battery device. Based on this, since the first power interface P1 is used to provide driving voltage to the switch module 420, when the first power interface P1 experiences a power failure, it can no longer support the switch module 420 in maintaining its original switching state. Furthermore, when the voltage of the first power interface P1 recovers, the direct closure of the switch module 420 will cause a large surge voltage across the switch module 420, thereby damaging the switch module 420. This application adds a monitoring module 410 and a main control module 440, with the monitoring module 410 electrically connected to the main control module 440. The monitoring module 410... When the first power interface P1 is in a power-off state, it is either in a non-working state or outputs a first indication signal, promptly notifying the main control module 440 to perform a reset. After the main control module 440 performs the reset, once the voltage of the first power interface P1 is restored, the main control module 440 will first control the pre-charge module 430 to close. Through the pre-charge circuit, the voltage difference across the switch module 420 is reduced, and then the switch module 420 is closed. This reduces the possibility of generating a large surge voltage across the switch module 420, thereby reducing damage to the switch module 420 and improving the reliability of the battery management device 400 and the battery device.

[0071] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. A battery management device, characterized in that, The battery management device includes: The monitoring module is configured to be electrically connected to the first power interface to obtain the power supply voltage from the first power interface; The switching module is configured to be electrically connected to the first power interface to obtain the drive voltage from the first power interface and to form the main power supply circuit for the load. The pre-charge module is configured to be electrically connected to the first power interface to obtain a drive voltage from the first power interface, and is formed in a pre-charge circuit that is connected in parallel with the main power supply circuit. The main control module is electrically connected to the monitoring module, the switch module, and the precharge module; When the first power interface is in a power-off state, the monitoring module is in a non-working state or outputs a first indication signal, and the main control module is configured to perform a reset based on the non-working state of the monitoring module and the first indication signal.

2. The battery management device according to claim 1, characterized in that, The main control module further includes a second indication signal output terminal, and the monitoring module includes a second indication signal receiving terminal. The second indication signal output terminal is connected to the second indication signal receiving terminal of the monitoring module. The second indication signal output terminal is configured to periodically send a second indication signal to the monitoring module at predetermined time intervals. The second indication signal is used to indicate that the main control module is working normally. The monitoring module further includes a first indication signal output terminal, and the main control module further includes a first indication signal receiving terminal. The first indication signal output terminal is configured to output the first indication signal when no second indication signal is received within the predetermined time period.

3. The battery management device according to claim 1, characterized in that, The monitoring module includes a first indicator signal output terminal, and the main control module includes a first indicator signal receiving terminal, with the first indicator signal output terminal connected to the first indicator signal receiving terminal. The monitoring module is configured to output a first indication signal through the first indication signal output terminal when the power supply voltage is not received.

4. The battery management device according to claim 2 or 3, characterized in that, The monitoring module includes a watchdog chip, and the main control module includes a microcontroller unit, which is electrically connected to the watchdog chip.

5. The battery management device according to claim 2 or 3, characterized in that, The switching module further includes a relay, which is configured to remain closed for a preset holding time after the first power interface is in the power-off state.

6. The battery management device according to claim 1, characterized in that, The main control module is electrically connected to the second power interface, and the second power interface supplies power to the main control module.

7. The battery management device according to claim 1, characterized in that, The monitoring module includes a watchdog chip; the main control module includes a microcontroller unit; wherein... The watchdog chip and relay are connected to the first power interface to obtain the power supply voltage from the first power interface; The microcontroller unit is electrically connected to the second power interface to obtain the power supply voltage from the second power interface; The microcontroller unit is connected to the watchdog chip to obtain the first indication signal or the non-operating state of the watchdog chip, and the microcontroller unit is configured to perform a reset based on the first indication signal or the non-operating state of the watchdog chip.

8. The battery management device according to claim 1, characterized in that, The switching module includes a first conducting terminal, a second conducting terminal, and a driving unit; the driving unit is used to be electrically connected to the first power interface and to obtain a driving voltage from the first power interface for driving the switching module to close or open; one end of the pre-charge module is electrically connected to the first conducting terminal, and the other end is electrically connected to the second conducting terminal.

9. The battery management device according to claim 8, characterized in that, The first conductive terminal is used to connect to the battery device, and the second conductive terminal is used to connect to the load.

10. The battery management device according to claim 8, characterized in that, The drive unit is also connected to the main control module and receives an enable signal from the main control module.

11. A battery device, characterized in that, Includes the battery management device according to any one of claims 1-10.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11.

Images