What is the industry situation of new energy vehicle battery management system (BMS)?

2021-11-17 10:52:01 POWER GEN 131

The battery management system (BMS) is the link between the battery and the user, and the main target is the secondary battery. Secondary batteries have the following shortcomings, such as low energy storage, short life, serial and parallel use problems, safety in use, and difficulty in battery power estimation. The performance of the battery is very complicated, and the characteristics of different types of batteries are also very different. The battery management system (BMS) is mainly to improve the utilization rate of the battery, prevent the battery from being overcharged and overdischarged, extend the service life of the battery, and monitor the status of the battery. With the development of the battery management system, other functions will be added.

The battery management system is a key component of electric vehicles and hybrid vehicles. In order to ensure the safe and reliable operation of the battery, the battery management system needs to have the following three functions:

  • 1. Accurately estimate the state of charge of the power battery pack

  • 2. Dynamically monitor the working status of the power battery pack

  • 3. Balance between single cells

In the future, electric vehicles will use lithium batteries as the main power source. The main reason is that lithium batteries have the advantage of high energy density, so their performance is relatively stable. However, the quality of lithium batteries is not easy to grasp when mass production of lithium batteries. There are slight differences in the power of battery cells when they leave the factory. With operating environment, aging and other factors, the inconsistency between batteries will become more obvious, and battery efficiency and life will also deteriorate. In addition, overcharging or overdischarging may lead to safety problems such as fire and combustion in severe cases. Therefore, the battery management system (BMS) can accurately measure the usage of the battery pack, protect the battery from overcharge and discharge, balance the power of each battery in the battery pack, and analyze and calculate the power of the battery pack and convert it to driving. Understand the endurance information to ensure the safe operation of the power battery.

Basic types of BMS

  • 1. Distributed

  • 2. Centralized

  • 3. Modular

  • 4. Selection of batteries

BMS cost and development trend

With the development of the domestic economy, the development of the battery management system market is facing huge opportunities and challenges. In terms of market competition, the number of battery management system companies is increasing, and the market is facing an asymmetry between supply and demand. The battery management system industry has a strong demand for further reshuffle. However, there are still relatively few battery management system market segments. With large room for development, information technology will become the core competitiveness.

The battery management system (BMS) accounts for a relatively high cost in the battery pack, and the price is still relatively expensive. The price of the battery management system (BMS) is positively related to the number of cells in the battery pack, and the battery management system (BMS) accounts for 30% of the total cost of the battery pack. Considering that the circuit board and chip design of BMS is still in its infancy, and the complexity of later products, the speed of replacement and the scale of mass production will gradually increase, it is expected that the prices of mainstream battery management systems (BMS) will show a slow downward trend. , Which can be reduced to about 60% in 2025. The battery management system (BMS), as an electronic component for real-time monitoring, automatic balancing, and intelligent charging and discharging, plays important functions such as ensuring safety, prolonging life, and estimating remaining power. It is an indispensable component in power and energy storage battery packs. Its market scale will expand simultaneously with lithium batteries in the power and energy storage fields. It is predicted that the demand for battery management system (BMS) market will reach more than 50 billion yuan in 2025.

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