Solar Battery Systems

Battery development background: With technological advancement and social progress, dedicated solar lithium batteries have emerged. This power system must ensure safety, stable operation, and ultra-high safety under high-altitude movement and high-current discharge.

The lithium battery design uses high-quality LiFePO4 cells, industrial-grade inverter modules, and a BMS management system. The BMS management system uses imported chips, featuring comprehensive multi-level protection design, precise single-cell voltage detection, efficient active balancing management, and intelligent management of multi-cell lithium batteries, effectively extending battery life with high reliability and intelligence.

This power supply can also be used for outdoor emergency communication equipment, mobile radio wave detection systems, and other field emergency equipment. The system can output AC/220V alternating current via vehicle charging or battery power supply. The complete system includes lithium batteries, BMS (Battery Management System), battery status display, inverter system, and charger, housed in a military-grade chassis that is shockproof and drop-resistant.

I. Design Requirements:

Based on product specifications and customer requirements, design a smart lithium battery compatible with the host, integrating high-spec safety performance, efficient automatic balancing management, intelligent battery pack management, and outstanding cycle life into the solution.

II. Industrial Portable Emergency Power Supply Design Solution:

1) Protection Circuit Board (PCM): A protection circuit designed for LiFePO4 battery packs. Based on the chemical characteristics of LiFePO4 batteries, it includes conventional protections such as overcharge, over-discharge, overcurrent, short circuit, and overtemperature, as well as battery capacity detection and dynamic balancing of the entire pack.

2) Protection Circuit: Uses imported ICs and MOSFETs for real-time online monitoring of overcharge, over-discharge, overcurrent, and short circuit conditions. The intelligent management scheme maximizes battery capacity and cycle life.

3) Overcurrent Fuse: Designed for BMS protection failure. Since the solution uses high-capacity, high-power cells, although the PCM provides overcurrent and short circuit protection, anomalies may cause protection failure. In the event of an output short circuit, a very large current could occur, leading to danger. Therefore, an overcurrent fuse is added to the solution. When an abnormal short circuit occurs, the fuse disconnects the circuit irreversibly, achieving abnormal protection.

4) Cells: Uses LARGE26650/3.2V/3000mAh LiFePO4 cells, with high consistency, high safety, and a cycle life of up to 2000 cycles. The battery pack parameters are 12.8V/60Ah.

5) Current Design: The normal operating current of the battery pack is 20A, with a maximum operating current of 30A and a peak starting current of 60A.

6) High-efficiency active balancing with low power consumption: 60mA balancing current, equivalent to 1.5A balancing effect.

7) Dedicated battery display for real-time monitoring of battery status.

8) The battery pack is isolated and fixed using plastic brackets, enhancing heat dissipation and safe use.