Gun drawing wake-up circuit, battery management system comprising same and vehicle control unit

Abstract

The invention relates to a gun pulling wake-up circuit for a battery management system, the battery management system comprising the circuit and a vehicle control unit. The circuit comprises an input pin connected to a vehicle-mounted charger to receive a gun drawing confirmation signal from the vehicle-mounted charger; the power supply pin is used for supplying power to the gun drawing wake-up circuit; the output pin is connected to a battery management system of the vehicle and is used for outputting a wake-up signal to the battery management system; the control loop comprises a first transistor and a second transistor, each transistor comprises a control end, a power input end and a power output end, the control end of the first transistor is connected to the input pin, the power input end of the first transistor is connected to the control end of the second transistor, and the power output end of the second transistor is connected to the control end of the first transistor. The power output end of the first transistor is grounded, the power input end of the second transistor is connected to the power supply pin, and the power output end of the second transistor is connected to the output pin.

Description

Technical Field

[0001] This disclosure relates to the technical field of waking up a battery management system, and more specifically, to a pull-out wake-up circuit for a battery management system, as well as a battery management system and a vehicle controller including the circuit. Background Technology

[0002] In the design of new energy vehicles (especially pure electric vehicles), the vehicle's battery pack needs to be charged regularly. The battery management system (BMS) plays a crucial role in this process, responsible for controlling and coordinating the charging process of each cell within the battery pack to ensure charging safety, efficiency, and minimal impact on battery life.

[0003] During vehicle charging, the BMS may enter a dormant state to reduce energy consumption and maximize vehicle efficiency. Therefore, it is required to be able to quickly wake up the BMS when the charging gun is disconnected in order to perform necessary battery status monitoring and charging termination procedures.

[0004] Existing charging gun-pulling wake-up mechanisms use a microcontroller to identify the charging gun's connection status and then use this microcontroller to wake up the BMS system. However, this existing wake-up mechanism still has some limitations. For example, the introduction of a microcontroller increases the complexity of circuit design and additional hardware, which not only increases circuit costs but also design complexity. Furthermore, relying on a single microcontroller for system wake-up carries the risk that the microcontroller will malfunction and fail to wake up the BMS, thus causing the BMS system to malfunction. Summary of the Invention

[0005] To overcome the problems existing in the current BMS pull-to-wake mechanism, this disclosure proposes an improved pull-to-wake circuit. This circuit is designed to provide an immediate and reliable wake-up signal upon pull-out, ensuring that the BMS can quickly recover from its sleep state to perform the required battery management and safety monitoring functions. Specifically, the circuit employs a high-efficiency transistor configuration, along with additional components such as resistors and diodes, to achieve a fast response to pull-out actions and accurate output of the wake-up signal.

[0006] Specifically, according to a first aspect of this disclosure, a battery management system pull-out wake-up circuit is provided, the circuit comprising:

[0007] An input pin is connected to the on-board charger to receive a gun disconnection confirmation signal from it.

[0008] A power supply pin is connected to an external power supply to power the gun-pulling wake-up circuit.

[0009] An output pin, connected to the vehicle's battery management system, is used to output a wake-up signal to the battery management system; and

[0010] The control loop includes a first transistor and a second transistor. Each transistor includes a control terminal, a power input terminal, and a power output terminal. The control terminal of the first transistor is connected to the input pin, the power input terminal of the first transistor is connected to the control terminal of the second transistor, the power output terminal of the first transistor is grounded, the power input terminal of the second transistor is connected to the power supply pin, and the power output terminal of the second transistor is connected to the output pin.

[0011] Advantageously, the first transistor and the second transistor are selected from the group consisting of bipolar transistors, metal-oxide-semiconductor field-effect transistors, junction field-effect transistors and insulated-gate bipolar transistors.

[0012] Advantageously, the first transistor is an NPN transistor and the second transistor is a PNP transistor.

[0013] Advantageously, the base of the NPN transistor is connected to the input pin, the collector of the NPN transistor is connected to the base of the PNP transistor, the emitter of the NPN transistor is grounded, the emitter of the PNP transistor is connected to the power supply pin, and the collector of the PNP transistor is connected to the output pin.

[0014] Advantageously, the circuit further includes at least one of the following resistors:

[0015] A first resistor is disposed between the input pin and the control terminal of the first transistor;

[0016] A second resistor is disposed between the control terminal and the ground terminal of the first transistor;

[0017] A third resistor is disposed between the power output terminal of the second transistor and the output pin; and

[0018] A fourth resistor is disposed between the output pin and the ground terminal.

[0019] Advantageously, the circuit further includes a diode, the anode of which is connected to the power output terminal of the second transistor, and the cathode of which is connected to the output pin.

[0020] Advantageously, the power supply pin is connected to the vehicle's low-voltage auxiliary power supply.

[0021] Advantageously, when the input pin receives a disconnect confirmation signal from the on-board charger, the first and second transistors are turned on, causing the output pin to output an edge-triggered signal to the vehicle's battery management system.

[0022] According to a second aspect of this disclosure, a battery management system is also proposed, the system including a battery control unit and a pull-out wake-up circuit as described above, the battery control unit being configured to wake up the battery management system when it receives an edge-triggered signal from the pull-out wake-up circuit.

[0023] According to a third aspect of this disclosure, a vehicle controller is also proposed, which integrates the gun-pulling wake-up circuit described above.

[0024] The disclosed pull-to-wake circuit not only improves the reliability and response speed of BMS wake-up, but also reduces the overall cost and complexity of the circuit by decreasing the number of components and optimizing the circuit layout. Furthermore, this wake-up circuit has strong compatibility, particularly with charging standards such as CN DC 2015+ and Super 2023, ensuring its wide applicability to different vehicle models and charging equipment. In particular, it can be integrated into various battery management systems and vehicle controllers, providing strong protection for the charging safety and energy efficiency of electric vehicles. Attached Figure Description

[0025] By incorporating the figures in this article and subsequently the accompanying figures Figure 1 The specific embodiments used to illustrate certain principles of this disclosure will make other features and advantages of the methods of this disclosure clearer or more specifically explained.

[0026] Figure 1 An internal structural diagram of a pull-to-wake circuit for a battery management system according to an exemplary embodiment of the present disclosure is shown. Detailed Implementation

[0027] The BMS pull-to-wake circuit according to the present disclosure will now be described with reference to the accompanying drawings and embodiments. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand the present disclosure. However, it will be apparent to those skilled in the art that implementations of the present disclosure may not include some of these specific details. Instead, the present disclosure may be practiced with any combination of the following features and elements, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims.

[0028] To overcome the problems existing in the current BMS pull-out wake-up mechanism, this disclosure proposes an improved BMS pull-out wake-up circuit. This circuit can not only simplify the design, reduce costs, and improve system reliability, but also ensure compatibility with existing charging standards, and achieve better pull-out wake-up and charging process management.

[0029] Figure 1 An internal structural diagram of a pull-out wake-up circuit for a battery management system according to an exemplary embodiment of the present disclosure is shown. The core of the circuit includes two transistors, namely a first transistor T1 and a second transistor T2, as well as several key resistors R1-R4 and a diode D1. These circuit components work together to achieve the pull-out wake-up function for the BMS. The following is in conjunction with… Figure 1 The internal structure of this circuit is described in detail.

[0030] like Figure 1 As shown, the unplugging and waking-up circuit mainly includes an input pin PIN, a power supply pin VCC, an output pin POUT, and a control loop. The input pin PIN is the circuit's input port, responsible for receiving the unplugging confirmation signal from the on-board charger, which is typically the CC2 signal. When the user unplugs the charging gun from the vehicle, the on-board charger's CC2 signal is transmitted to this input pin.

[0031] The power supply pin VCC provides the necessary power to the battery gun removal wake-up circuit. For example, this pin VCC can receive power from the vehicle's low-voltage auxiliary power supply KL30. The output pin POUT connects to the vehicle's battery management system (BMS) (e.g., the battery management unit within the BMS) to output a wake-up signal to the BMS. Once a battery gun removal action is detected, the output pin will be automatically activated, waking the battery management system from its sleep state.

[0032] The control loop is the core of this wake-up circuit, and it includes two key transistors, T1 and T2. Figure 1 In this embodiment, T1 is an NPN transistor and T2 is a PNP transistor. The base of T1 is connected to the input pin PIN of the wake-up circuit, the collector of T1 is connected to the base of T2, the emitter of T1 is grounded, the emitter of T2 is connected to the power supply pin VCC of the wake-up circuit, and the collector of T2 is connected to the output pin POUT of the wake-up circuit.

[0033] exist Figure 1In the specific embodiment shown, although T1 uses an NPN transistor and T2 uses a PNP transistor, this disclosure is not limited to using only these types of transistors. For example, transistors T1 and T2 can be selected from, but are not limited to, the following types of transistors: bipolar junction transistors (BJTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), junction field-effect transistors (JFETs), and insulated-gate bipolar transistors (IGBTs). These transistor types each have their own characteristics and advantages, and can be selected according to specific application requirements and circuit design requirements. When selecting the transistor types for T1 and T2, designers need to consider factors such as circuit voltage, current rating, switching speed, power consumption, and cost. By flexibly selecting appropriate transistor types, the pull-to-wake circuit of this disclosure can adapt to the application requirements of different battery management systems and vehicle controllers, thereby improving circuit performance and reliability.

[0034] In addition, the circuit includes multiple resistors R1 to R4 and diode D1 to optimize circuit performance and protect the circuit from overvoltage or current surges. For example, resistor R1 limits the current flowing to transistor T1 while reducing the input signal voltage level, ensuring that transistor T1 is not damaged by excessive voltage. R2 provides a stable voltage reference for transistor T1 and also suppresses potential noise, ensuring stable transistor operation. R3 limits the current flowing from T2 to POUT, protecting the battery management system from excessive current surges. R4 provides a stable voltage reference for the output pin and also serves a protective function, preventing abnormal output voltage.

[0035] In addition, the circuit includes a diode D1, whose anode is connected to the collector of the second transistor T2, and its cathode is connected to the output pin POUT of the wake-up circuit. The function of diode D1 is to allow current to flow in only one direction, preventing reverse current from damaging the circuit, and to provide protection when a reverse voltage is detected.

[0036] Through the coordinated work of these components, the pull-out wake-up circuit not only ensures the rapid and accurate wake-up of the battery management system when the gun is pulled out, but also protects the circuit from damage under various operating conditions, improving the reliability and safety of the entire system.

[0037] When the on-board charger is connected to an external charging station and charging begins, the BMS may enter a sleep state to conserve energy. The voltage on the CC2 line suddenly increases the instant the user finishes charging and unplugs the charging gun. This voltage, typically 12V, is captured by the voltage divider circuit between R1 and GND and transmitted through the first transistor T1. When the base of T1 receives the unplug signal from the CC2 line, T1 turns on. The turn-on of T1 further triggers the second transistor T2, allowing current to flow from the power supply pin VCC to the output pin POUT, thus sending a wake-up signal to the BMS. This wake-up signal is an edge-triggered signal that enables the BMS to quickly wake from sleep mode to perform necessary battery status monitoring and charging termination procedures. When the charging gun is plugged in, the voltage at the CC2 terminal is 6V. After voltage division, the voltage reaching the base of the transistor is less than its turn-on voltage, therefore the system is not woken up.

[0038] Through this design, the disclosed pull-to-wake circuit not only improves the reliability and response speed of BMS wake-up, but also reduces the overall circuit cost and complexity by decreasing the number of components and optimizing the circuit layout. Furthermore, this wake-up circuit has strong compatibility, particularly with charging standards such as CN DC 2015+ and Super 2023, ensuring its wide applicability to different vehicle models and charging equipment. In particular, it can be integrated into various battery management systems and vehicle controllers, providing strong protection for the charging safety and energy efficiency of electric vehicles.

[0039] An exemplary embodiment of this disclosure also proposes a battery management system including a battery control unit and the pull-to-wake circuit described above. The battery control unit is configured to wake up the battery management system upon receiving an edge-triggered signal from the pull-to-wake circuit. By integrating this wake-up circuit, not only is the power consumption of the BMS system optimized, but the reliability and efficiency of BMS wake-up are also improved.

[0040] Another exemplary embodiment of this disclosure also proposes a vehicle controller that integrates the above-described gun-pulling wake-up circuit.

[0041] Those skilled in the art will understand that, in this disclosure, terms such as “comprising” and “including” indicate that, in addition to the steps that are directly and explicitly stated in the specification and claims, the technical solution of this application does not exclude the presence of other steps that are not directly or explicitly stated.

[0042] While this disclosure has been described above with reference to preferred embodiments, it is not limited thereto. Any modifications and alterations made by those skilled in the art without departing from the spirit and scope of this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A battery management system with a battery gun removal wake-up circuit, characterized in that, The circuit includes: An input pin (PIN) is connected to the on-board charger to receive a disconnect confirmation signal from it; A power supply pin (VCC) is connected to an external power supply to power the gun-pulling wake-up circuit. An output pin (POUT) is connected to the vehicle's battery management system to output a wake-up signal to the system; and The control loop includes a first transistor (T1) and a second transistor (T2). Each transistor includes a control terminal, a power input terminal, and a power output terminal. The control terminal of the first transistor (T1) is connected to the input pin (PIN), the power input terminal of the first transistor (T1) is connected to the control terminal of the second transistor (T2), the power output terminal of the first transistor (T1) is grounded, the power input terminal of the second transistor (T2) is connected to the power supply pin (VCC), and the power output terminal of the second transistor (T2) is connected to the output pin (POUT).

2. The gun-pulling wake-up circuit according to claim 1, characterized in that, The first transistor (T1) and the second transistor (T2) are selected from the group consisting of bipolar transistors, metal-oxide-semiconductor field-effect transistors, junction field-effect transistors and insulated-gate bipolar transistors.

3. The gun-pulling wake-up circuit according to claim 1 or 2, characterized in that, The first transistor (T1) is an NPN transistor, and the second transistor (T2) is a PNP transistor.

4. The gun-pulling wake-up circuit according to claim 3, characterized in that, The base of the NPN transistor is connected to the input pin (PIN), the collector of the NPN transistor is connected to the base of the PNP transistor, the emitter of the NPN transistor is grounded, the emitter of the PNP transistor is connected to the power supply pin (VCC), and the collector of the PNP transistor is connected to the output pin (POUT).

5. The gun-pulling wake-up circuit according to claim 1 or 2, characterized in that, The circuit further includes at least one of the following resistors: A first resistor (R1) is disposed between the input pin (PIN) and the control terminal of the first transistor (T1); A second resistor (R2) is disposed between the control terminal and the ground terminal of the first transistor (T1); A third resistor (R3) is disposed between the power output terminal of the second transistor (T2) and the output pin (POUT); and A fourth resistor (R4) is placed between the output pin (POUT) and the ground terminal.

6. The gun-pulling wake-up circuit according to claim 1 or 2, characterized in that, The circuit further includes a diode (D1) whose anode is connected to the power output terminal of the second transistor (T2) and whose cathode is connected to the output pin (POUT).

7. The gun-pulling wake-up circuit according to claim 1 or 2, characterized in that, The power supply pin (VCC) is connected to the vehicle's low-voltage auxiliary power supply.

8. The gun-pulling wake-up circuit according to claim 1 or 2, characterized in that, When the input pin (PIN) receives a disconnect confirmation signal from the on-board charger, the first transistor (T1) and the second transistor (T2) are turned on, so that the output pin (POUT) outputs an edge-triggered signal to the vehicle's battery management system.

9. A battery management system, characterized in that, The system includes a battery control unit and a pull-out wake-up circuit according to any one of claims 1 to 8, the battery control unit being configured to wake up the battery management system when it receives an edge-triggered signal from the pull-out wake-up circuit.

10. A vehicle controller, characterized in that, The vehicle controller integrates a gun-pulling wake-up circuit according to any one of claims 1 to 8.

Images