Battery management system wake-up circuit for automobile

Abstract

The utility model relates to a battery management system wake-up circuit for an automobile, which comprises a management chip and a control chip MCU (Microprogrammed Control Unit), the management chip interacts with the control chip MCU, the battery management system wake-up circuit also comprises a VBAT input interface, the VBAT input interface is coupled with a VBAT pin of the management chip, the battery management system wake-up circuit also comprises a WAKE interface, the WAKE interface is electrically connected with a resistor R2 and then is electrically connected with a WAKE pin of the management chip, the battery management system wake-up circuit also comprises a BP interface and a BM interface, and the BM interface is electrically connected with the BM interface. And the BP interface and the BM interface are electrically connected with the CMC respectively and then electrically connected with the BP pin and the BM pin of the management chip.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and more specifically to a wake-up circuit for a battery management system for an automobile. Background Art

[0002] In the context of the current automotive industry's transformation to electrification, the battery management system (BMS) is one of the core components of electric vehicles (EV) and hybrid electric vehicles (HEV), and its performance directly affects the vehicle's range, safety and battery life. Traditional battery management systems face many technical challenges, including but not limited to low energy management efficiency, insufficient system reliability, limited communication compatibility, and imperfect battery balancing strategies.

[0003] Low energy efficiency: Early BMS designs often do not have efficient energy management mechanisms. Even when the vehicle is not driving, the system will continue to consume power, which not only shortens the vehicle's endurance but also accelerates the battery aging process.

[0004] System reliability issues: Due to design defects, some BMSs fail to monitor battery status and handle exceptions in a timely and effective manner, which may lead to battery overcharging, over-discharging or abnormal temperature, and even cause safety accidents in severe cases.

[0005] Communication compatibility limitations: Due to the lack of standardized communication protocol support, BMS in the past may be difficult to integrate seamlessly with other electronic control systems within the vehicle, affecting the efficiency and accuracy of data exchange and hindering the improvement of the vehicle's overall intelligence level.

[0006] Poor battery balancing management: The consistency differences between the battery cells in the battery pack will increase over time. If the BMS balancing management strategy is not smart or precise enough, the performance of the entire battery pack will decay rapidly, shortening its service life.

[0007] Therefore, it is urgent to develop a new type of automotive battery management system wake-up circuit to solve the above technical problems. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a battery management system wake-up circuit for an automobile in view of the above-mentioned defects of the prior art.

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] A battery management system wake-up circuit for an automobile is constructed, comprising a management chip and a control chip MCU, the management chip and the control chip MCU interact with each other, a VBAT input interface, the VBAT input interface is coupled to the VBAT pin of the management chip, a WAKE interface, the WAKE interface is electrically connected to a resistor R2 and then electrically connected to the WAKE pin of the management chip, and a BP interface and a BM interface, the BP interface and the BM interface are electrically connected to the CMC respectively and then electrically connected to the BP pin and the BM pin of the management chip.

[0011] Furthermore, the model of the management chip is NCV7381.

[0012] Furthermore, the control chip MCU includes a communication controller, a bus monitor, and a host interface. The communication controller of the control chip MCU is electrically connected to the TxD pin and TxEN pin input of the management chip, the RxD pin of the management chip is electrically connected to the communication controller output of the control chip MCU, the bus monitor of the control chip MCU is electrically connected to the RxEN pin input of the management chip, the BGE pin of the management chip is electrically connected to the bus monitor output of the control chip MCU, the host interface of the control chip MCU is electrically connected to the STBN pin and EN input of the management chip, and the ERRN pin of the management chip is electrically connected to the bus monitor output of the control chip MCU.

[0013] Furthermore, the main power of the car battery is input from the VBAT input interface, the VBAT input interface is electrically connected to a voltage stabilizing diode and then electrically connected to the V0 terminal, the VCC terminal and the VBAT pin of the management chip, the V0 terminal is electrically connected to the capacitor C1 and then electrically connected to the Vo pin of the management chip, the VCC terminal is electrically connected to the capacitor C1 and then electrically connected to the Vcc pin of the management chip, and the VBAT input interface is electrically connected to the capacitor C3 and then electrically connected to the VBAT pin of the management chip.

[0014] Furthermore, the VBAT input interface is electrically connected to a voltage stabilizing diode and then electrically connected to a resistor R1, and the resistor R1 is electrically connected to the WAKE interface.

[0015] Furthermore, the BP interface is electrically connected to a resistor R3, the BM interface is electrically connected to a resistor R4, and the resistor R3 and the resistor R4 are electrically connected in parallel to a diode and then grounded.

[0016] The beneficial effects of the utility model are:

[0017] 1. Efficient energy management: Through a specially designed wake-up mechanism (WAKE interface and WAKE pin), the system can efficiently enter the working state from low-power mode according to external signals. This means that the battery management system (BMS) will only be activated when a wake-up signal is received, which significantly reduces energy consumption during non-essential times, extends the service life of the vehicle battery, and improves overall energy efficiency.

[0018] 2. Enhanced system reliability: NCV7381 is used as the management chip, which is specially designed for automotive applications and has high reliability and stability. With the multi-faceted monitoring and control functions of the control chip MCU (such as bus monitoring, communication control, host interface, etc.), it can effectively monitor the battery status and respond to errors or abnormal conditions in a timely manner (reported through the ERRN pin), ensuring the stability and safety of BMS operation.

[0019] 3. Flexible communication capabilities: The communication controller of the control chip MCU supports serial communication with the TxD and RxD pins of the management chip and is compatible with CAN or LIN protocols. This not only improves the speed and efficiency of data transmission, but also enhances the compatibility and integration of the system with other automotive electronic components, making it easier to realize information exchange and control in complex networks.

[0020] 4. Fine power management: The combination of VBAT input interface, voltage regulator diode and capacitor ensures the stable supply of main power. At the same time, the V0 and VCC split power supply mechanism meets the different voltage requirements of different parts and ensures the stable operation of internal circuits. In addition, through the configuration of resistors R1 to R4, the current is effectively controlled to prevent overload, protect circuit components from damage, and improve the durability of the entire system.

[0021] 5. Support battery balancing management: BP and BM interfaces are directly related to battery balancing management. Through connection with CMC, the status of each battery cell can be accurately monitored to achieve efficient battery balancing control, optimize battery pack performance, and extend the overall service life of the battery pack.

[0022] In summary, the technical solution of the present application significantly improves the energy efficiency, reliability, communication capability and ability to maintain battery health of the automotive battery management system through optimized wake-up strategies, enhanced system monitoring, flexible communication design, sophisticated power management and support for battery balancing, and is of great value in promoting the development of electric vehicle and hybrid vehicle technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0024] Figure 1 The utility model discloses a circuit principle diagram of a wake-up circuit of a battery management system for an automobile. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be described clearly and completely in combination with the technical solution in the embodiments of the utility model. Obviously, the described embodiments are partial embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0026] The automobile battery management system wake-up circuit of the preferred embodiment of the utility model is as follows Figure 1As shown, it includes a management chip and a control chip MCU. The model of the management chip is NCV7381. The management chip and the control chip MCU interact with each other. The control chip MCU includes a communication controller, a bus monitor, and a host interface. The communication controller of the control chip MCU is electrically connected to the TxD pin and TxEN pin input of the management chip, the RxD pin of the management chip is electrically connected to the communication controller output of the control chip MCU, the bus monitor of the control chip MCU is electrically connected to the RxEN pin input of the management chip, the BGE pin of the management chip is electrically connected to the bus monitor output of the control chip MCU, the host interface of the control chip MCU is electrically connected to the STBN pin and EN input of the management chip, the ERRN pin of the management chip is electrically connected to the bus monitor output of the control chip MCU, and also includes a VBAT input interface. The VBAT input interface is coupled to the VBAT pin of the management chip. The main power of the car battery is input from the VBAT input interface. VB The AT input interface is electrically connected to a voltage stabilizing diode and then electrically connected to the V0 end, the VCC end and the VBAT pin of the management chip respectively. The V0 end is electrically connected to the capacitor C1 and then electrically connected to the Vo pin of the management chip. The VCC end is electrically connected to the capacitor C1 and then electrically connected to the Vcc pin of the management chip NCV7381. The VBAT input interface is electrically connected to the capacitor C3 and then electrically connected to the VBAT pin of the management chip NCV7381. It also includes a WAKE interface, and the WAKE interface is electrically connected to a resistor R2 and then electrically connected to the WAKE pin of the management chip. The VBAT input interface is electrically connected to a voltage stabilizing diode and then electrically connected to a resistor R1. The resistor R1 is electrically connected to the WAKE interface. It also includes a BP interface and a BM interface. The BP interface and the BM interface are electrically connected to the CMC respectively and then electrically connected to the BP pin and the BM pin of the management chip. The BP interface is electrically connected to a resistor R3, and the BM interface is electrically connected to a resistor R4. The resistor R3 and the resistor R4 are connected in parallel and then electrically connected to a diode and then grounded.

[0027] Among them, VBAT is the main power supply, which comes from the car battery, and V0 and VCC are provided by two different level converters to power the internal circuits at different voltages. The INH (Inhibit) interface allows external control of the activity state of NCV7381, the WAKE pin receives the wake-up signal from other systems to activate the BMS, the TBN (Standby) and EN (Enable) pins are used to control the standby mode and enable state of downstream devices, and the BM (Balancing Management) and BP (Balancing Pin) are pins related to battery balancing management. The Tx and Rx pins represent the serial communication interfaces for sending and receiving data, respectively, and can communicate using the CAN (Controller Area Network) or LIN (Local Interconnect Network) protocol. TxD, RxD, TxEN, and RxEN correspond to the direction of data transmission and the enable signals for sending and receiving, respectively. The ERRN pin is used to report system errors or abnormal conditions. When the WAKE pin receives a high level, the system wakes up from low power mode and starts normal operation. Resistors (R1, R2, R3, R4) and capacitors (C1, C2) are used to stabilize the power supply, prevent overcurrent, and ensure reliable communication. Energy is saved by receiving a wake-up signal through the WAKE pin, and the BMS is activated only when needed. In addition, the entire system can be disabled through the INH pin to further reduce power consumption.

[0028] The automotive battery management system wake-up circuit proposed in this application has the following significant beneficial effects:

[0029] 1. Efficient energy management: Through a specially designed wake-up mechanism (WAKE interface and WAKE pin), the system can efficiently enter the working state from low-power mode according to external signals. This means that the battery management system (BMS) will only be activated when a wake-up signal is received, which significantly reduces energy consumption during non-essential times, extends the service life of the vehicle battery, and improves overall energy efficiency.

[0030] 2. Enhanced system reliability: NCV7381 is used as the management chip, which is specially designed for automotive applications and has high reliability and stability. With the multi-faceted monitoring and control functions of the control chip MCU (such as bus monitoring, communication control, host interface, etc.), it can effectively monitor the battery status and respond to errors or abnormal conditions in a timely manner (reported through the ERRN pin), ensuring the stability and safety of BMS operation.

[0031] 3. Flexible communication capabilities: The communication controller of the control chip MCU supports serial communication with the TxD and RxD pins of the management chip and is compatible with CAN or LIN protocols. This not only improves the speed and efficiency of data transmission, but also enhances the compatibility and integration of the system with other automotive electronic components, making it easier to realize information exchange and control in complex networks.

[0032] 4. Fine power management: The combination of VBAT input interface, voltage regulator diode and capacitor ensures the stable supply of main power. At the same time, the V0 and VCC split power supply mechanism meets the different voltage requirements of different parts and ensures the stable operation of internal circuits. In addition, through the configuration of resistors R1 to R4, the current is effectively controlled to prevent overload, protect circuit components from damage, and improve the durability of the entire system.

[0033] 5. Support battery balancing management: BP and BM interfaces are directly related to battery balancing management. Through connection with CMC, the status of each battery cell can be accurately monitored to achieve efficient battery balancing control, optimize battery pack performance, and extend the overall service life of the battery pack.

[0034] In summary, the technical solution of the present application significantly improves the energy efficiency, reliability, communication capability and ability to maintain battery health of the automotive battery management system through optimized wake-up strategies, enhanced system monitoring, flexible communication design, sophisticated power management and support for battery balancing, and is of great value in promoting the development of electric vehicle and hybrid vehicle technologies.

[0035] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A battery management system wake-up circuit for an automobile, characterized in that: It includes a management chip and a control chip MCU, which interact with each other. It also includes a VBAT input interface, which is coupled to the VBAT pin of the management chip. It also includes a WAKE interface, which is electrically connected to a resistor R2 and then electrically connected to the WAKE pin of the management chip. It also includes a BP interface and a BM interface, which are electrically connected to the CMC respectively and then electrically connected to the BP pin and BM pin of the management chip.

2. The automotive battery management system wake-up circuit according to claim 1, characterized in that: The model of the management chip is NCV7381.

3. The automotive battery management system wake-up circuit according to claim 2, characterized in that: The control chip MCU includes a communication controller, a bus monitor, and a host interface. The communication controller of the control chip MCU is electrically connected to the TxD pin and TxEN pin input of the management chip, the RxD pin of the management chip is electrically connected to the communication controller output of the control chip MCU, the bus monitor of the control chip MCU is electrically connected to the RxEN pin input of the management chip, the BGE pin of the management chip is electrically connected to the bus monitor output of the control chip MCU, the host interface of the control chip MCU is electrically connected to the STBN pin and EN input of the management chip, and the ERRN pin of the management chip is electrically connected to the bus monitor output of the control chip MCU.

4. The battery management system wake-up circuit for automobile according to claim 3, characterized in that The main power supply of the car battery is input from the VBAT input interface. The VBAT input interface is electrically connected to a voltage stabilizing diode and then electrically connected to the V0 terminal, the VCC terminal and the VBAT pin of the management chip. The V0 terminal is electrically connected to the capacitor C1 and then electrically connected to the Vo pin of the management chip. The VCC terminal is electrically connected to the capacitor C1 and then electrically connected to the Vcc pin of the management chip. The VBAT input interface is electrically connected to the capacitor C3 and then electrically connected to the VBAT pin of the management chip.

5. The battery management system wake-up circuit for automobile according to claim 4, characterized in that The VBAT input interface is electrically connected to a voltage stabilizing diode and then electrically connected to a resistor R1, and the resistor R1 is electrically connected to the WAKE interface.

6. The automotive battery management system wake-up circuit according to claim 5, characterized in that The BP interface is electrically connected to a resistor R3, and the BM interface is electrically connected to a resistor R4. The resistor R3 and the resistor R4 are connected in parallel and electrically connected to a diode and then grounded.

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