Overview

The Dongjin 5kWh Lithium-ion Battery is a high-performance energy storage solution designed for solar and backup power systems. It is based on advanced LiFePO4 (Lithium Iron Phosphate) technology, offering high safety, long lifespan, and stable power output.

This battery is mainly used in residential solar systems, commercial backup setups, UPS systems, and hybrid inverter configurations. Its wall-mounted compact design makes it suitable for space-limited installations while providing modern smart monitoring features like WiFi and Bluetooth connectivity.

The system is engineered to deliver efficient energy storage, fast charging capability, and scalable expansion support, making it a reliable solution for long-term energy independence.

1. Battery Chemistry & Internal Structure

The battery uses Lithium Iron Phosphate (LiFePO4) chemistry.

Internal Components:

• Cathode: LiFePO4
• Anode: Graphite
• Electrolyte: Lithium-ion conductive medium
• Separator: Ionic flow control layer

Working Principle:

• During charging, lithium ions move from cathode to anode and store energy
• During discharging, ions return to cathode and generate electrical power

Key Advantages:

• Extremely safe chemistry (low fire risk)
• High thermal stability
• Long cycle life
• Stable voltage output throughout discharge

2. Cell Configuration & Voltage System

Voltage discharge is smooth and stable without sudden drops.

3. Electrical Specifications

Low resistance reduces heat generation, improves efficiency, and ensures stable inverter compatibility.

4. Charging System (CC-CV Method)

Charging follows Constant Current / Constant Voltage (CC-CV) method.

Charging Process: Constant Current Phase (fast charging) → Constant Voltage Phase (stabilization) → Termination when current drops below 0.05C

5. Discharging Performance

Supports high-load appliances (AC, fridge, motors). Stable voltage under load with no sudden voltage drop.

6. Cycle Life & Durability

Real-Life Interpretation: 1 cycle per day = 15 years lifespan | 2 cycles per day = 7-8 years. Gradual capacity degradation over time.

7. Battery Management System (BMS)

Built-in intelligent BMS ensures safety and performance.

Protection Features: Overcharge protection, Over-discharge protection, Over-temperature protection, Short circuit protection

Smart Functions: Cell balancing, Voltage monitoring (individual cells), Current regulation, Fault detection & automatic shutdown

8. Communication & Smart Features

Supported interfaces: CAN Bus, RS485, RS232, WiFi, Bluetooth

Features: Mobile app monitoring, Real-time system tracking, Inverter integration

9. Display System

Touch LCD Display showing Voltage, Current, State of Charge (SOC), and System status.

10. Temperature Range

Suitable for hot climates like Pakistan.

11. Physical Specifications

12. Protection Rating

Limited dust protection and splash resistance. Recommended for indoor or covered installation.

13. Scalability & Expansion

Supports up to 15 batteries in parallel

Voltage remains constant, capacity increases.

14. Performance Summary

• High surge power capability
• Stable voltage under heavy load
• Fast charging and discharging
• High efficiency energy transfer

15. Engineering Summary

The Dongjin 5kWh Lithium-ion Battery is an advanced energy storage system designed with a focus on:

• Long lifespan (6000 cycles)
• High safety (LiFePO4 chemistry + BMS)
• Smart connectivity (WiFi/Bluetooth)
• Expandable energy storage system
• Stable and efficient power delivery
• High temperature resistance

It is a reliable, efficient, and future-ready solution for modern solar energy systems and backup power applications.