The lithium battery design scheme uses high-quality lithium iron phosphate batteries, industrial-grade inverter modules, and a BMS management system. The BMS management system uses an imported chip design. The battery has a complete multiple protection design, accurate single-string battery voltage detection, and efficient active balance. The management plan, the intelligent management of multiple strings of lithium batteries, and other advantages, effectively extend battery life, with high reliability and high intelligence.
Design requirements
1. Design requirements: According to product specifications and customer requirements, design intelligent lithium batteries that match the host, and integrate high-specification safety performance, high-efficiency automatic balance management, intelligent battery pack management, and outstanding cycle life into the solution. 2. Industrial portable emergency power supply design scheme: 1) Protective board (PCM): A protection circuit designed for lithium iron phosphate battery packs. According to the chemical characteristics of lithium iron phosphate batteries, the design has conventional overcharge, over-discharge, overcurrent, short circuit, and overtemperature, etc. In addition to protection; it also provides battery power detection and dynamic balance of the entire battery pack.
2) Protection circuit: Imported IC and MOS tubes are used to perform online real-time monitoring of cell overcharge, over-discharge, overcurrent, short circuit, and other functions. The intelligent management scheme can maximize battery capacity and cycle life.
3) Overcurrent fuse: mainly designed for BMS protection failure. Because the solution uses large-capacity, high-power batteries, although PMC has over-current and short-circuit protection if an abnormality occurs, the protection function will fail, and a very large current will be generated in the case of output short-circuit, leading to danger. Therefore, an over-current fuse is added to the scheme. When an abnormal short-circuit occurs, the fuse opens the circuit and cannot be restored to achieve the purpose of abnormal protection.
4) Battery: LARGE26650/3.2V/3000mAh lithium iron phosphate battery is used. The single battery has the characteristics of high consistency, high safety, and a cycle life of 2000 times. The whole battery parameter is 12.8V/60Ah.
5) Current design: The normal working current of the whole battery is 20A, the maximum working current can reach 30A, and the instant starting current can reach 60A.
6) High-efficiency active equalization, low power consumption 60mA equalization current, equivalent to 1.5A equalization effect.
7) A dedicated display screen for battery design can monitor battery usage in real-time.
8) The battery pack is isolated and fixed by a plastic bracket, which is more conducive to heat dissipation and safe use of the battery.
