Component selection and testing of battery design

1 yuan selection standard 1.1 protection IC selection ● Middle and high end: mm3280h02, precision 8261aagmd, 理光 R5400N110FA ● Low-end: Composite IC, etc. ● Special requirements for individual customers 1.2 MOSFET selection ● Middle and high-end: Panasonic MTMC8E2A0L; AON3816, MAGNA, etc. ● Low-end: MOS 8205, etc. 1.3 resistance, capacitance ● Capacitor: Use TDK, Maruta Capacitive Brand, requires the material to be X5R or X7R, and does not use a capacitance of Y5V material. ● Resistance: Use TDK, national brands, materials with good accuracy 1.4 ID resistance and NTC resistance ● The selection of the two is based on the customer's requirements, the accuracy, the NTC thermistor needs to determine its B value size, and determine the package according to the space and wiring requirements of PCM. 1.5 fuse and PTC ● When the customer has requested the use, the fuse should give priority to the use of 6A / 0603 package. ● Customers have no requirements, but it is necessary to use the PTC or fused when the relevant certification is required. ● If the customer has no requirements, no cuts and PTC are not required when relevant authentication is required. 2 protection board design 2.1 PCB material The material selected in the material of the protector mainly selected FR4, mainly considering the fire level, mechanical strength, price and other factors. When the gold finger on the PCM needs to be exhibited, it needs to be electroplated and wear-resistant metal layers, such as the standard gold plating thickness of the A thick gold ≥ 0.25um B ordinary plated gold thickness ≥ 0.015 um, hardboard copper thickness ≥1.0 OUNCE 3 electrical performance test standard 3.1 Measuring Instrumentation ● Voltage meter requirements: The accuracy of the meter of the measurement voltage should not be less than 0.5, and the internal resistance is not less than 10kΩ / v. ● Current table requirements: The accuracy of the meter of the measurement should not be less than 0.5. ● Temperature meter requirements: The accuracy of measuring temperature should not be less than ± 0.5 ° C. ● The current of the constant current source is constant, and its current change should be within ± 1%. ● The voltage of the constant voltage source is adjustable, and its voltage change should be in the range of ± 0.5%. 3.2 internal resistance test Test method: Use the AC 1kHz detection method and the accuracy of the 0.5-level meter, measure the internal resistance between the positive and negative poles at the battery interface, usually the mobile phone battery internal resistance ≤ 150mΩ, if there is a PTC battery internal resistance recommendation ≤180mΩ, depending on the specific situation. Technology area On Mu, the SiC, GaN, and Three Levels brought by Siqiang reach your efficiency. How to prevent switching power supply noise by using secondary output filters Ceramic vertical mount package (CVMP) welding precautions and layout Mathematical modeling and loop compensation design of DC-DC converters What are the commonly used benchmark regulated power?