18650 rechargeable battery lithium 3.7v 3500mah
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18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

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3500mah 18650 battery.What is a BMS battery? Introduction to BMS battery management system framework

release time:2024-01-05 Hits:     Popular:AG11 battery

  

  BMS is an electric vehicle battery management system and is an important link between the vehicle power battery and electric vehicles. The BMS collects, processes, and stores important information during the operation of the battery pack in real time, exchanges information with external devices such as vehicle controllers, and solves key issues such as safety, availability, ease of use, and service life in the lithium battery system. The main function is to improve the utilization rate of the battery, prevent the battery from overcharging and over-discharging, extend the service life of the battery, and monitor the status of the battery. In layman's terms, it is a system for managing, controlling, and using battery packs.

  Source of this article: Panda Hardware WeChat public account ID: xiongmaoyingjian

  1. What is BMS?

  Lithium-ion batteries have limited range of use;

  For lithium-ion batteries, their ideal operating range is very limited and not wide. Therefore, lithium-ion batteries must be managed during application, especially in power battery application scenarios.

  2. Security issues

  Distortion

  Swelling

  Flaming on fire

  Explosion

  Overvoltage (overcharge), overcurrent and overtemperature will bring a series of safety hazards to lithium-ion batteries.

  3.Performance management

  The external characteristics of lithium batteries are closely related to their own status (SOC/SOH/temperature) and ambient temperature.

  4.Lifespan

  Temperature factor environmental factor

  Voltage factor (SOC & ΔSOC) Voltage factor (SOC window)

  Current factor Current factor

  High SOC and high temperature environments will aggravate the irreversible capacity loss of the battery.

  5. Consistency

  Capacity

  Impedance

  Self-disge rate Self-disge rate

  It is almost impossible to require all the cells in the battery pack to be completely consistent. This means that there will be inconsistent working conditions (internal resistance/heat generation/SOC range) and different aging rates between the cells. Therefore, it is necessary to Balanced management.

  What are the main tasks of BMS?

  BMS main tasks:

  Battery status monitoring

  Battery status analysis

  Battery safety protection

  Energy control management

  Battery information management

  …

  BMS needs to avoid over-range abuse of power batteries and ensure safe, reliable, efficient and long-life operation of power batteries.

  1. Introduction to BMS system

  1.1 BMS system architecture

  A typical BMS system architecture

  BMS system architecture

  Master-slave BMS topology

  Local ECU layer

  Management of 6-12 cells in a module

  Communication via CAN or daisy-chain

  Voltage monitor for every cell

  Multi-points temperature monitor

  Passive balance or active balancing

  Function realization by MCU or ASIC

  Is daisy chain communication used?

  Advantages

  No isolator for each LECU

  Easy harness for system

  Low cost

  Disadvantages

  EMI/EMC problem for vertical bus

  Limited range

  Break on daisy-chain cause the interruption of whole communication

  Cost comparison of two options


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