Energy Storage Battery 48V 50Ah Lithium Battery for Telecommunications Backup Power Supply

Functional requirements for lithium iron phosphate batteries

Sleep function

Lithium batteries should have a sleep function, and the BMS of the battery pack should be completely disconnected during transportation, storage, or offline operation; When the battery pack transitions from an online state (i.e. the positive and negative terminals of the battery pack output and the communication interface are connected to the outside world) to an offline state (i.e. the positive and negative terminals of the battery pack output and the communication interface are disconnected from the outside world), the BMS should have a discrimination function to automatically enter sleep mode based on the power and battery pack status. When the battery pack transitions from an offline state (i.e., the positive and negative terminals of the battery pack output terminal and the communication interface are disconnected from the outside world) to an online state (i.e., the positive and negative terminals of the battery pack output terminal and the communication interface are connected to the outside world), the BMS should be able to distinguish and automatically activate it, and adjust the working state according to the power and battery pack conditions.

Electric heating function

When lithium batteries are used in scenarios below -5 ℃, a DC heating device should be installed (temperature should be controlled and adjusted according to the actual situation), and the battery pack should have a dedicated heat dissipation design to ensure uniform heating and normal operation of the equipment.

Charging current limiting management function

Lithium batteries should have autonomous current limiting charging function to ensure that the battery pack can charge normally when the voltage input is within the working range. The charging current limit value should be set between 0.1C3 (A) and 0.2C3 (A), with a default value of 0.2C3 (A).

Protection against high total charging voltage

Lithium batteries should have a high total charging voltage protection function. When the charging reaches the total voltage alarm point, an alarm will be triggered, and when it reaches the protection point, protection will be provided to cut off the battery. When the total voltage drops to the recovery point, charging will resume.

Protection against low total discharge voltage

Lithium batteries should have a low discharge total voltage protection function. When the discharge reaches the low total voltage alarm point, the discharge circuit should be cut off and an alarm should be triggered. After a period of time, the battery pack should enter sleep mode.

Low voltage protection for discharge cells

Lithium batteries should have a low voltage protection function for individual cells during discharge. When the discharge reaches the individual cell voltage alarm point, an alarm will be triggered, and when it reaches the protection point, protection will be applied to cut off the battery. After a period of time, the battery should enter sleep mode.

Discharge overcurrent management

Lithium batteries should have an output overcurrent protection function set according to user needs, during which the circuit should be cut off and an alarm should be triggered.

Battery high temperature protection function

Lithium batteries should have high-temperature protection function, which will sound an alarm when the battery temperature reaches the alarm point; Protect when reaching the protection point, acting to cut off; After the temperature drops to a certain value, it automatically recovers.

Low temperature protection function of battery

Lithium batteries should have low-temperature protection function, which will sound an alarm when the battery temperature reaches the alarm point; Protect when reaching the protection point, acting to cut off; After the temperature rises to a certain value, it will automatically recover.

Calculation of State of Charge (SOC) of battery pack

Lithium batteries should have dynamic charge calculation function, and the error between the calculated value and the actual battery charge should not exceed 5%.

Output short circuit protection

When a direct short circuit occurs between the positive and negative terminals of a lithium battery output, the circuit should be automatically cut off and an alarm should be triggered in an instant. The BMS and battery cells should not be damaged (including no ignition, deformation, leakage, smoking, fire or explosion); After troubleshooting, it should be possible to manually or automatically restore work.

Technical requirements for lithium battery monitoring

Remote measurement

It can perform remote monitoring of battery pack/battery voltage, state of charge (SOC), battery pack charging/discharging current, cycle times (discharging over 80% of nominal capacity is considered as one cycle), ambient temperature/battery pack temperature, battery pack internal resistance (optional), as well as historical data query, fault log query and other functions.

Remote signal quantity

It can collect remote signaling indicators such as charging/discharging status of lithium batteries, overcharge/overcurrent alarm of battery packs, undervoltage/overcurrent alarm of battery pack discharge, overvoltage alarm of single cell charging (optional), undervoltage alarm of single cell discharge (optional), polarity reversal alarm of battery packs, high temperature alarm of environment/battery pack/PCBA board (optional), low temperature alarm of environment, low capacity alarm of battery packs, failure alarm of temperature/voltage/current sensor of battery packs, failure alarm of single cell (optional), and failure alarm of battery packs (optional).