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Why does the electric vehicle battery need a BMS lithium battery intelligent management system?

pxid 2019-12-05 276 times

Why does the electric vehicle battery need a BMS lithium battery intelligent management system? The BMS lithium battery management system should be able to control the charge and discharge of electric vehicle batteries, battery temperature, and the balance between individual batteries. In the electric vehicles of industrial design companies, the power lithium battery pack is one of the core components, which occupies a very high proportion in the manufacturing cost of the entire vehicle. Temperature, voltage and charge / discharge current and other related parameters are monitored in real time and dynamically.

Why does the electric vehicle battery need a BMS lithium battery intelligent management system?

Why does the electric vehicle battery need a BMS lithium battery intelligent management system?

 

1. Safety. Lithium batteries have poor safety and sometimes have defects such as explosions. In particular, lithium batteries with lithium cobaltate as the positive electrode material cannot be discharged at a large current and have poor safety.

2. Maintainability. The capacity decay and power cannot be accurately predicted at low temperature of the lithium battery, which makes the equipment maintainable. Meters that have been online for a long time require regular battery replacement, and remote monitoring equipment has scattered work sites, and the distance between each site is long. Therefore, the battery replacement workload is huge and the cost is high.

In order to reduce the maintenance workload and maintenance cost, it is required that the lithium battery BMS management system has an accurate charge state estimation function to accurately grasp the battery's charge state and perform battery replacement work in a more targeted manner. Low self-power consumption to reduce maintenance frequency and extend battery life.

BMS lithium battery management system is mainly used in the communication field and the mineral industry. Specific products include backup lithium iron battery systems for communication, battery management systems for electric vehicles, and lithium iron phosphate explosion-proof battery management systems.

Why does the electric vehicle battery need a BMS lithium battery intelligent management system?

The thermal runaway temperature of the lithium iron phosphate battery (LFP) is higher than 250 ° C, which makes it a very safe battery with a long life. However, its low specific energy (less than half of NCA) makes its application in small mopeds not common.

Nickel cobalt aluminate (NCA) has the highest specific energy compound with a specific energy of 250-290 Wh / kg, but its cost is high and its safety is low. Its service life is also different, and the number of repeated charging is generally between 500 and 1,000, which is only about half of that of lithium iron batteries. Tesla uses thousands of 18650 nickel-cobalt-lithium batteries and more rigorous tests to increase service life to avoid full discharge and full charge.

A good BMS battery management system has a temperature sensor that can monitor the voltage of a single battery pack and detect low-performance batteries before the lithium battery pack is packaged. This 100% test guarantees higher yields, higher battery capacity and reduced warranty commitments. Good battery management systems also record mechanical shock, deep discharge dates and information, so you can avoid false warranty claims. Excellent BMS can also detect the humidity of lithium battery packs to avoid accidents.

Why does the electric vehicle battery need a BMS lithium battery intelligent management system?

The BMS lithium battery intelligent management system should have the function of displaying the state of charge (SOC) of the battery and monitoring the energy flow of the battery (charging and discharging processes). When the SOC of the power battery used for ship propulsion reaches the minimum power required for the normal operation of the ship, visual and audible alarm signals should be issued. The alarm device of this alarm signal shall be independent of other alarm devices.

With the widespread use of electric vehicles, battery capacity, safety, health, and endurance have become increasingly important concerns. Lithium battery management system (BMS) is an important link between on-board batteries and electric vehicles. Its main functions include: real-time monitoring of battery physical parameters; battery status estimation; online diagnosis and early warning; charge, discharge and precharge control; balance management and Management, etc.

In short: BMS lithium battery management system is the core component of electric vehicles and the heart of power. The importance of battery management system BMS is self-evident.

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