Do LiFePO4 Batteries Need BMS From Custom Lithium-Ion Battery Pack Manufacturer?

Views:4     Author:China Lithium Ion Battery Factory     Publish Time: 2021-01-06      Origin:https://www.jbbatterychina.com/

Do LiFePO4 Batteries Need BMS From Custom Lithium-Ion Battery Pack Manufacturer?

Lithium iron phosphate (LiFePO4) batteries come in a single package with a lot of power and value. This chemistry of lithium battery is the big part of its superior performance. While all reputed lithium-ion batteries also include another important component along with the battery cells from custom lithium-ion battery pack manufacturer: a carefully designed battery management system (BMS). A well-designed battery management system can utmost protect and monitor a lithium-ion battery to optimize performance, maximize lifetime, and ensure safe operation over a wide range of using conditions. All Polinovel lifepo4 batteries come along with a BMS integrated inside or outside. Let's have a closer look at how Polinovel BMS optimizes the life of a lithium iron phosphate batteries. 

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Lithium iron phosphate batteries pack a lot of power and value into a small package. The chemistry of these batteries is a big part of their superior performance. But all reputable commercial lithium-ion batteries also include another important element along with the battery cells themselves: a carefully designed electronic battery management system (BMS). A well-designed battery management system protects and monitors a lithium-ion battery to optimize performance, maximize lifetime, and ensure safe operation over a wide range of conditions. LiFePO4 cells from custom lithium-ion battery pack manufacturer operate safely in a range of voltages, typically from 2.0V to 4.2V. Some lithium chemistries result in cells that are highly sensitive to over-voltage, but LiFePO4 cells are more tolerant. Still, significant over-voltage for a prolonged period during charging can cause plating of metallic lithium on the battery's anode which permanently degrades performance. Also, the cathode material may oxidize, become less stable, and produce carbon dioxide which may lead to a buildup of pressure in the cell. Polinovel BMS limit each cell and the battery itself to a maximum voltage to 3.9V and 15.6V. 

Under & Over Voltage Protection 

Under-voltage during battery discharge is also a concern since discharging a LiFePO4 cell below approximately 2.0V may result in a breakdown of the electrode materials. The BMS acts as a fail safe to disconnect the battery from circuit if any cell drops below 2.0V. Polinovel lithium batteries have a recommended minimum operational voltage, which is 2.5V for cell, and 10V for battery. 

Lithium iron phosphate cells operate safely over a range of voltages, typically from 2.0V to 4.2V. Some lithium chemistries result in cells that are highly sensitive to overvoltage, but LiFePO4 cells are more tolerant. Still, significant overvoltage for a prolonged period during charging can cause plating of metallic lithium on the battery's anode which permanently degrades performance. Also, the cathode material may oxidize, become less stable, and produce carbon dioxide which may lead to a buildup of pressure in the cell. All RELiON battery management systems limit each cell and the battery itself to a maximum voltage. The BMS in the RELiON RB100 LiFePO4 battery, for example, protects each cell in the battery and limits the voltage in the battery to 15.6V.

Undervoltage during battery discharge is also a concern since discharging a LiFePO4 cell below approximately 2.0V may result in a breakdown of the electrode materials. Lithium batteries have a recommended minimum operational voltage. The minimum recommended voltage is 11V. The BMS acts as a failsafe to disconnect the battery from the circuit if any cell drops below 2.0V.

Every battery has a maximum specified current for safe operation. If a load which draws a higher current to the batter, it can result in overheating the battery. While it's important to use the battery in a way to keep the current draw below the maximum specification, the BMS again acts as a backstop against over-current conditions and disconnects the battery from circuit. 

Short Circuit Protection 

Short circuit of the battery from custom lithium ion battery pack manufacturer is the most serious form of over-current condition. It most commonly happens when the electrodes are accidentally connected with a piece of metal. The BMS must quickly detect a short circuit condition before the sudden and massive current draw overheats the battery and causes catastrophic damage. 

Over Temperature 

Lithium iron phosphate batteries operate efficiently and safely at temperatures up to 60oC or more. But at higher operating and storage temperatures, as with all batteries, the electrode materials will begin to degrade. The BMS of a lithium battery uses embedded thermistors to  monitor the temperature during operation, and it will disconnect the battery from the circuit at a specified temperature. 

Cell Imbalance

Lithium-ion batteries from custom lithium ion battery pack manufacturer have a major difference from lead-acid batteries when it comes to balancing the voltage in each individual cell during charging. Because of small differences in manufacturing or operating conditions, each cell in a battery charges at a slightly different rate. In a lead-acid battery, if one cell charges faster and reaches its full voltage, the typical low end of charge current, along with the excess charge-return, will ensure the other cells get fully charged. In a sense, the cells in a lead-acid battery are self-equalizing during charge.

This is not the case with lithium-ion batteries. When a lithium-ion cell is fully charged, its voltage begins to rise further which may lead to electrode damage. If the charge of the entire battery is stopped when only one cell is fully charged, the remaining cells do not reach full charge and the battery will operate below peak capacity. A well-designed BMS will ensure each cell safely and fully charges before the entire charging process is complete.

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Summary 

Lithium iron phosphate batteries from custom lithium ion battery pack manufacturer are constructed of more than just individual cells connected together. They would also include a battery management system (BMS) which is not usually visible to the end user, makes sure each cell in the battery remains within safe limits. At the Polinovel, all our LiFePO4 batteries include an internal or external BMS to protect, control, organize and monitor the battery to ensure the safety and maximize the lifetime over the full range of operating conditions.

For more about LiFePO4 batteries BMS,you can pay a visit to china custom ev lithium ion battery factory JB Battery at https://www.jbbatterychina.com/aboutus.html for more info.

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JBBATTERY has over 10 years experiences in designing and manufacturing lithium battery, also is become one of the best Lithium ion Battery Manufacturer in China. We also design and develop BMS communication protocol like 232,485 and CAN BUS ect. All our lithium batteries are equipped with Deep Sleep Function now.
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