Exploring the Components of a Mobile Phone Battery

Mobile phone batteries contain various components that play crucial roles in their functionality. Let’s take a closer look at some key elements:

1. Component Selection Criteria

• Protection IC Selection
  • High-end options: MM3280H02, Seiko 8261AAGMD, Ricoh R5400N110FA
  • Low-end options: Composite IC, etc.
• Special Requirements of Individual Customers
• MOSFET Selection
  • Mid-to-high end choices: Panasonic MTMC8E2A0L, AON3816, Magna, etc.
  • Low-end choices: MOS 8205, etc.
• Resistor-Capacitor
  • Capacitors: Opt for TDK, MARUTA brands with X5R or X7R materials. Avoid Y5V capacitors.
  • Resistors: Use TDK, Yageo brands with higher accuracy materials.
• ID Resistance and NTC Resistance
  • Select resistance values and accuracy based on customer needs. Customize NTC thermistors based on space and wiring requirements.
• Fuse and PTC

When considering fuse usage, prioritize the 6A/0603 package. In the absence of specific customer requests or certification needs, the use of PTC or fuse becomes essential. However, if neither applies, the fuse and PTC can be omitted.

2. Design of PCB Protection Board

When designing a PCB protection board, opt for FR4 material due to its fire resistance, mechanical strength, and cost-effectiveness. Ensure gold fingers on the PCM are electroplated with durable metal layers such as thick gold plating or hard plate copper skin.

3. Electrical Performance Test Standards

For accurate testing, use voltmeters and ammeters with at least 0.5% accuracy. Thermometers should have a ±0.5°C accuracy. Constant current and voltage sources should provide stable outputs with minimal variations.

4. PCB Quotation Method

When preparing to manufacture a PCBA board, calculate material costs, SMT patches, DIP plug-ins, and testing expenses. Consider packaging, logistics, and regional pricing adjustments to provide a comprehensive quotation. A well-prepared PCBA quotation showcases expertise and enhances customer conversion rates.