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Advanced Battery Management System in Lithium iron Phosphate Battery

4,068 Published by BSLBATT Aug 22,2019

Battery management systems (BMS) are real-time systems controlling many functions vital to the correct and safe operation of the electrical energy storage system in EVs and PHEVs. This includes monitoring of temperatures, voltages and currents, maintenance scheduling, battery performance optimization, failure prediction and/or prevention as well as battery data collection/analysis.

Battery Management System

Lithium iron phosphate batteries come in a single package with a lot of power and value. This chemistry of lithium offers superior performance. But all reputed commercial batteries which include another vital component along with Lithium phosphate batteries i.e. carefully planned and designed Battery Management system(BMS). A cautiously designed Battery management system(BMS) protects, increase lifetime, monitor, balance and communicate with different modules which ensures safe operation over a wide range of conditions.

For the power or plant engineer responsible for standby power who’s the battery is the last line of defense against a power blackout or a telecommunications network outage BMS means Battery Management Systems. Such systems encompass not only the monitoring and protection of the battery but also methods for keeping it ready to deliver full power when called upon and methods for prolonging its life. This includes everything from controlling the charging regime to planned maintenance.

For the automotive engineer, the Battery Management System is a component of a much more complex fast-acting Energy Management System and must interface with other onboard systems such as engine management, climate controls, communications and safety systems.

Battery Management System

At BSLBATT, all our lithium iron phosphate batteries come along with BMS integrated inside or outside. Let’s have a closer look at how the BSLBATT battery management system(BMS) optimizes the life of lithium iron phosphate batteries.

1. An LFP cell will be damaged if the voltage over the cell falls to less than 2,5V.

2. An LFP cell will be damaged if the voltage over the cell increases to more than 4,2V.

Lead-acid batteries will eventually also be damaged when discharged too deeply or overcharged, but not immediately. A lead-acid battery will recover from total discharge even after it has been left in discharged state during days or weeks (depending on battery type and brand).

3. The cells of a LFP battery do not auto-balance at the end of the charge cycle. The cells in a battery are not 100% identical. Therefore, when cycled, some cells will be fully charged or discharged earlier than others. The differences will increase if the cells are not balanced/equalized from time to time.

4. In a lead-acid battery a small current will continue to flow even after one or more cells are fully charged (the main effect of this current is a decomposition of water into hydrogen and oxygen). This current helps to fully charge other cells that are lagging behind, thus equalizing the charge state of all cells. The current which flows through a fully-charged LFP cell however, is nearly zero, and lagging cells will therefore not be fully charged. Over time the differences between cells may become so extreme that, even though the overall battery voltage is within limits, some cells will be destroyed due to over- or under voltage. An LFP battery therefore must be protected by a BMS that actively balances the individual cells and prevents under- and over-voltage.

BSLBATT Battery Management System

Lithium iron phosphate batteries constructed of more than single cells connected together. It also consists of a Battery management system(BMS) which is not visible to the end-user, which ensures that each cell of the battery remains within the safe limits. At BSLBATT, all our lithium iron phosphate batteries come along with BMS integrated inside or outside which protects, increase the lifetime, monitor, balance and communicate with different modules which ensures safe operation over a wide range of conditions.

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