Advanced Li-Ion Battery Charging System

1. System Overview

* Total batteries to be charged simultaneously: 100 Li-Ion batteries
* System divided into 5 racks, each rack charging 20 batteries
* Each rack will have one dedicated charging circuit (PCB)

2. Battery Specifications (Per Battery)

* Battery Type: Rechargeable Li-Ion
* Capacity: 1800 mAh
* Nominal Voltage: 3.7 V
* Energy: 6.66 Wh
* Connector: Male crimp pin (ZMJM), 5 mm pitch

3. Charging Architecture (Per Rack – 20 Batteries)

* Each battery must be charged individually and safely, even though powered from a common PCB
* Charging method to follow CC–CV (Constant Current – Constant Voltage) profile
* Charging completion indication is mandatory (per battery or per channel)

4. Driver / Charger Requirement

Preferred approach:

20 independent charging channels per rack

* Multiple multi-channel Li-Ion charger ICs, or
* Individual charger IC per battery, or
* Modular driver architecture (recommended for safety and fault isolation)

5. Protection & Safety (Mandatory)

* Over-charge protection
* Over-current protection
* Reverse polarity protection
* Thermal monitoring (PCB or battery-level if feasible)
* Fault indication for failed or disconnected battery

6. Indications & Interface

* Charging status indication:

* Charging
* Fully charged
* Fault (optional but preferred)
* Indicators can be light ,alarms i attached the picture