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Why do electric vehicle batteries need BMS lithium battery intelligent management system?

pxid 2021-01-28 158 times

Why do electric vehicle batteries need BMS lithium battery intelligent management system? The BMS lithium battery management system should be able to control the charging and discharging of electric vehicle batteries, battery temperature, and the balance between single cells. 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 of the vehicle manufacturing cost. As the monitoring and management center of the electric vehicle power battery pack, the battery management system must Related parameters such as temperature, voltage and charge and discharge current are monitored dynamically in real time.

Why do electric vehicle batteries need BMS lithium battery intelligent management system?

1. Safety. Lithium batteries have poor safety and some defects such as explosions. In particular, lithium cobalt oxide batteries cannot be discharged at a high current, and their safety is poor.

2. Maintainability. The capacity decay and power consumption of lithium batteries cannot be accurately predicted at low temperatures, making the maintainability of the equipment poor. Long-term online meters need to replace batteries regularly, but remote monitoring equipment has scattered work sites and long distances between sites. Therefore, the workload of battery replacement is huge and the cost is high.

In order to reduce maintenance workload and maintenance costs, it is necessary for the lithium battery BMS management system to have an accurate state of charge estimation function to accurately grasp the state of charge of the battery, and to perform battery replacement work more purposefully; at the same time, the battery management system is also required Low power consumption to reduce maintenance frequency and extend battery life.

Why do electric vehicle batteries need BMS lithium battery intelligent management system?

The BMS lithium battery management system is mainly used in the communication field and the mining industry. Specific products include a backup lithium iron battery system for communication, an electric vehicle battery management system, and a mine lithium iron phosphate explosion-proof battery 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 very long life. However, its low specific energy (less than half of NCA) makes its application in small mopeds not universal.

Lithium nickel cobalt aluminate (NCA) is the compound with the highest specific energy with a specific energy of 250-290Wh/kg, but its cost is high and its safety is low. The service life is also different. Generally, the number of recharges is between 500 and 1000, which is only about half of that of lithium iron batteries. Tesla uses thousands of 18650 nickel-cobalt lithium batteries and uses more stringent tests to improve the 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 production, higher battery capacity and reduces warranty commitments. A good battery management system also records mechanical impact, deep discharge date and information, so it can avoid false warranty applications. An excellent BMS can also detect the humidity of the lithium battery pack to avoid accidents.

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

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