1. Design requirements of low speed lithium battery for warehouse and Airport
The low-speed power lithium-ion battery of warehouse and airport should meet the requirements of high current discharge, which will not affect the transportation of goods and people, but the continuous working time of the battery should be at least 8 hours, and the charging time of the battery should be controlled within 5 hours. The battery requires high current discharge instantly, and the battery should be explosion-proof. For this reason, our company adopts the imported battery cell, which has the advantages of high energy ratio, light weight, small volume, high cycle life, high safety, high voltage and good consistency. The lithium battery pack adopts the special structure explosion-proof process design, and the customized BMS management system can prevent the battery from being unable to return without power. The specific parameters are as follows:
Nominal voltage: 64V
Nominal capacity: 80Ah
Charging voltage: 73V
Discharge current: 50A
Instantaneous discharge current: 150A
Discharge cut off voltage: 50V
Product size: 320 * 300 * 260mm
Charging temperature: 0 ~ 45 ℃
Discharge temperature: - 20 ~ 60 ℃
Battery shell: cold rolled sheet metal
Waterproof grade: IP4X
2. Low speed lithium battery design for warehouse and airport:
1) BMS: it is mainly a protection circuit designed for rechargeable lithium battery pack. Due to the chemical characteristics of lithium battery, it is necessary to provide intelligent power calculation, overcharge, over discharge, short circuit, overcurrent and other protection functions to avoid burning, explosion and other hazards.
2) Protection IC (Protection IC): the main protection function chip of the design scheme, which can monitor the overcharge, over discharge, over current, short circuit and other functions of the cell online and constantly, so that the cell can work in a safe, stable and efficient range.
3) Temperature switch: mainly designed for temperature protection function. When the temperature of the battery itself reaches 70±5℃ due to other abnormal problems, the temperature switch will act for temperature protection
4) Lithium ion cell: lithium ternary / lithium iron phosphate.
5) Field effect transistor (MOSFET): MOSFET, in the protection circuit to play a switching role, always make the voltage at both ends of the load will not rise or fall, to ensure voltage stability.
6) Battery packaging: cold rolled sheet metal.