Key points and requirements for electric vehicle BMS PCB design

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Key points and requirements for electric vehicle BMS PCB design

Posted Date: 2024-01-17

With the popularity of electric vehicles, the battery management system (Battery Management System, BMS) plays a crucial role in the performance, safety and lifespan of electric vehicles. BMS is responsible for monitoring the status of the battery, controlling the charge and discharge process, managing the battery temperature, and preventing overcharge and over-discharge to ensure optimal battery performance, safety and reliability. BMS PCB design plays a key role in ensuring battery performance, safety and reliability. This article briefly explains the main points of electric vehicle BMS PCB design and relevant domestic specifications and requirements to help PCB engineers better meet the needs of battery management.

Key points of electric vehicle BMS PCB design:

Hierarchical design: Electric vehicle BMS usually includes multiple modules, such as battery management, communication, power management, etc. Therefore, PCB design should adopt a hierarchical structure so that the signal and power lines of different modules can be clearly and effectively separated.

EMC (Electromagnetic Compatibility) considerations: Electric vehicle BMS PCB design must consider electromagnetic compatibility to prevent electromagnetic interference from interfering with other vehicle electronic equipment and ensure system reliability. In the design, shielding measures, ground wire planning and noise reduction technology should be adopted to reduce electromagnetic radiation and anti-interference capabilities.

High-temperature environment adaptability: Electric vehicle battery packs work in high-temperature environments, so BMS PCB must have high-temperature resistance. The use of high-temperature-resistant materials, proper heat dissipation design, and temperature sensors to monitor battery temperature are key.

Safety requirements: BMS is responsible for battery safety management and must meet strict safety requirements. PCB design should consider battery overcharge, over-discharge and short-circuit protection to ensure battery safety.

Communication interface: Electric vehicle BMS usually requires data interaction with vehicle control systems, charging piles and monitoring systems. Therefore, communication interfaces such as CAN, LIN, and Ethernet should be considered in the design to meet different communication needs.

Maintainability: Electric vehicle BMS requires regular maintenance and upgrades. PCB design should consider easy maintenance features such as clear markings, easily replaceable components and modular design.

Low-power design: To extend battery life, BMS should adopt a low-power design. PCB design should pay attention to reducing power consumption, including optimizing circuits, selecting low-power components and sleep mode design.

Fault tolerance: The electric vehicle BMS must have a certain fault tolerance to prevent a single point of failure from affecting the entire system. Employing redundant designs and fault detection techniques is a common practice.

Domestic electric vehicle BMS specifications and requirements:

In China, the BMS PCB design of electric vehicles must comply with a series of national and local standards to ensure the safety and performance of electric vehicles. Here are some key specifications and requirements:

GB/T 31485-2015 "General Specifications for Battery Management Systems for Electric Vehicles": This standard specifies the performance, reliability, safety and communication requirements of electric vehicle BMS. These specifications must be adhered to in the design to ensure BMS compliance.

GB/T 31486-2015 "Safety Specifications for Lithium-Ion Power Batteries for Electric Vehicles": This standard specifies the safety requirements for lithium-ion batteries. The BMS must be able to monitor and manage the status of the battery to ensure safety.

GB/T 32960-2016 "Technical Requirements for Remote Diagnosis and Communication of Road Vehicles": This standard specifies the remote diagnosis and communication requirements for electric vehicles, including BMS data transmission and cloud monitoring. The application of these communication technologies should be considered in the design.

Local standards: Some local governments may establish additional BMS requirements to meet local safety and environmental standards. Design teams should pay close attention to local regulations and requirements.

in conclusion:

Electric vehicle BMS PCB design is a key factor in ensuring battery performance, safety and reliability. Designers must consider points such as hierarchical design, EMC, high-temperature environmental adaptability, safety requirements, communication interfaces, maintainability, low-power design, and fault tolerance. At the same time, relevant domestic norms and requirements, such as GB/T 31485-2015, GB/T 31486-2015 and GB/T 32960-2016, must be followed to ensure the compliance of BMS. The future development of electric vehicles requires continuous improvement and innovation in BMS PCB design to meet growing needs and challenges.

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