Lithium/Iron Phosphate Battery BMS Introduction
It is well known that battery management systems (BMS) are usually found in lithium batteries ( LiFePO4 batteries ), but not in lead-acid batteries. So why lithium batteries need an additional BMS than lead-acid batteries? This has a lot to do with the material properties of Li-ion battery itself.
1. First, in terms of materials, lithium in lithium batteries (LiFePO4 batteries) has more activity than lead in lead-acid batteries. The negative electrode material of lithium batteries is flammable. In order to achieve the same safety of lead-acid batteries, lithium-ion battery materials such as diaphragm and shell should be made stronger and thicker.
Therefore, lithium batteries by definition should be heavier and larger than lead-acid batteries. But apparently lithium batteries (lithium iron phosphate batteries) currently on the market are much smaller in weight and size than lead-acid batteries. This is due to the wisdom of Aolithium technology.
2. Secondly, lithium batteries (LiFePo4 BATTERY), although they have more advantages than other types of batteries, are also limited by factors such as cell materials and current manufacturing processes. This leads to differences in internal resistance, capacity and voltage between individual lithium batteries. As a result, in practice, individual cells in a battery pack are prone to uneven heat dissipation or overcharging and discharging. Over time, under harsh operating conditions, these cells are likely to be damaged prematurely and the overall life of the battery pack will be greatly reduced.
To avoid the above situation, the technicians decided to equip the lithium battery (LiFePo4 battery) with a BMS management system.
As the battery management system (BMS) is mainly for intelligent management and maintenance of each battery cell, preventing overcharging and overcharging, prolonging the battery life and monitoring the battery status. It provides security for the use of the battery.
Battery Management System (BMS) Features
1. Accurate estimation of SOC (residual performance)
Accurately estimate the state of charge, i.e., remaining capacity, of lithium batteries (lithium iron phosphate batteries). It ensures that the state of charge is kept within a reasonable range to avoid damage to the battery by overcharging or over discharging. This is the most basic feature that allows the user to understand the specific situation of the battery and perform the next operation on the battery according to the actual situation.
2. Dynamic battery monitoring
Lithium battery (lithium iron phosphate) in the charging and discharging process, real-time detection of the voltage, temperature, charging and discharging current and total battery voltage of each cell in the battery to prevent the battery from overcharging or overcharging. At the same time can reflect the battery status in time to maintain the reliability and efficiency of the operation of the entire lithium battery (lithium iron phosphate).
3. Balance between lithium batteries (lithium iron phosphate)
That is, the single battery is balanced charging, so that the lithium battery (lithium iron phosphate) in each cell reaches a balanced state. Balancing technology is the key technology of the battery energy management system, and is currently being researched and developed around the world.
Therefore, from all aspects, equipping the battery (lithium iron phosphate) with a BMS management system is an essential step. This can extend the life of the battery, but also to protect the battery. But not all lithium battery brands are equipped with BMS management systems, such as battleborn and SOK. As a consumer, you should pay attention to this when buying lithium iron phosphate batteries. You can specifically check the difference between Aolithium and SOK, battleborn.