Component selection and testing of battery design

Component selection and testing of battery design

1 component selection criteria

1.1 Protection IC Selection

● High-end: MM3280H02, Seiko 8261AAGMD, Ricoh R5400N110FA

● Low-end: composite IC, etc.

● Special requirements for individual customers

1.2 MOSFET selection

● High-end: Panasonic MTMC8E2A0L; AON3816, Magna, etc.

● Low end: MOS 8205, etc.

1.3 resistance, capacitance

● Capacitor: Use TDK, MARUTA capacitor brand, the required material is X5R or X7R, and the capacitor of Y5V material is not used.

● Resistance: use TDK, Guoju brand, requires better precision material

1.4 ID resistance and NTC resistance

●The choice of the two is to configure the resistance value and accuracy according to the customer's requirements. The NTC thermistor needs to determine the B value. The package should be determined according to the space and wiring requirements of the PCM.

1.5 fuse and PTC

● When the customer requests to use, the fuse should be given priority in the 6A/0603 package.

● The customer does not require it, but when it is needed for the relevant certification, it is necessary to consider using a PTC or a fuse.

● Do not use fuses and PTCs when the customer does not require or require relevant certification

2 protection board design

2.1 PCB material

FR4 is mainly used in the material selection of the protection board, mainly considering factors such as fire rating, mechanical strength and price. When the gold finger on the PCM needs to be exposed, it is necessary to plate a metal layer with good appearance and wear resistance, such as the standard gold plating thickness of A thick gold ≥ 0.25 um B ordinary gold plating gold thickness ≥ 0.015 um, hard copper thickness ≥ 1.0 ounce

3 Electrical performance test standards

3.1 Measuring instrument requirements

● Voltmeter requirements: The accuracy of the meter for measuring voltage should be no less than 0.5, and the internal resistance should be no less than 10KΩ/V.

● Ammeter requirements: The accuracy of the meter for measuring current should be no less than 0.5.

● Thermometer requirements: The accuracy of the meter for measuring temperature should be no less than ±0.5 °C.

● The current of the constant current source is constantly adjustable, and the current change should be within ±1%.

● The voltage of the constant voltage source is adjustable, and the voltage change should be within ±0.5%.

3.2 Internal resistance test

Test method: use the AC 1KHz detection method and the instrument with accuracy less than 0.5, measure the internal resistance between the positive and negative terminals of the battery interface. Usually, the internal resistance of the mobile phone battery is ≤150mΩ. If there is a PTC battery internal resistance, it is recommended. ≤180mΩ, as the case may be.

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