Detailed explanation of BMC technical requirements for electric vehicles

1. Introduction to BMC Technology

BMC (Battery Management Controller) is the core component of the electric vehicle power battery management system (BMS), responsible for the management and control of the battery pack. It consists of microcontrollers, sensors, A/D converters, D/A converters, communication interfaces and other components.

BMC technology has the following characteristics:

Safety: BMC can effectively prevent battery overcharge, over discharge, over current, short circuit and other safety accidents.

Efficiency: BMC can improve the charging and discharging efficiency of the battery pack.

Reliability: BMC ensures stable operation of the battery pack.

2. BMC technical workflow

The workflow of BMC technology mainly includes the following steps:

1. Data collection: BMC collects data such as voltage, current, temperature, impedance, etc. of the battery pack through sensors .

2. Data processing: BMC processes the collected data, including filtering, calibration, conversion, etc.

3. Status evaluation: The BMC evaluates the status of the battery pack based on the processed data, including health status, remaining power, charge and discharge status, etc.

4. Control strategy: BMC formulates the control strategy of the battery pack according to the status of the battery pack and the power requirements of the vehicle, including charge and discharge control, protection control, and balancing control.

5. Execution control: BMC executes control strategies through actuators to control the charging, discharging, protection, and balancing of the battery pack.

6. Fault diagnosis: BMC diagnoses battery pack faults and provides fault information.

3. BMC Technical Principle

BMC technology is based on the following principles:

Battery management algorithm: BMC uses a battery management algorithm to manage and control the battery pack.

Control theory: BMC adopts control theory to achieve stable control of the battery pack.

Communication technology: BMC uses communication technology to communicate with the components inside the battery pack and other vehicle systems.

4. BMC Technical Communication Protocol

BMC technology uses the following communication protocols:

CAN bus: CAN bus is a commonly used communication protocol of BMC, which is used for communication between various components inside the battery pack.

LIN bus: LIN bus is a commonly used communication protocol for BMC, used for communication between battery packs and other components of BMS.

Ethernet: Ethernet is the communication protocol that BMC will develop in the future and is used for communication between the battery pack and other vehicle systems.

V. BMC Technical Reference Data

Commonly used reference data in BMC technology include:

Battery Voltage: The typical voltage range for an electric vehicle battery pack is 200V-400V.

Battery Current: Typical current range for electric vehicle battery packs is 100A-500A.

Battery temperature: The typical operating temperature range of electric vehicle battery packs is -40℃-60℃.

Charge and discharge efficiency: The typical charge and discharge efficiency of electric vehicle battery packs is 90%-95%.

6. BMC Technology Application

BMC technology is widely used in the field of electric vehicles, including:

Passenger cars: BMC is widely used in electric passenger cars, such as Tesla, BYD, etc.

Commercial vehicles: BMC is widely used in electric commercial vehicles, such as Foton, Dongfeng, etc.

Construction machinery: BMC is widely used in electric construction machinery, such as excavators, loaders, etc.

7. Future Development of BMC Technology

BMC technology will develop in the following directions in the future:

Functional integration: Integrate battery management, charge and discharge control, protection control, balancing control and other functions into the BMC to improve the integration and functionality of the BMC.

Intelligence: Artificial intelligence technology is used to improve the intelligence level of BMC and realize active management and predictive maintenance of battery packs.

Networking: Connect BMC with other vehicle systems to achieve vehicle data sharing and collaborative control.