Basic knowledge of lithium ion battery protection board
Lithium-ion battery protection board:
(1) Main technical parameters:
A. Overcharge protection voltage
B. Overcharge actual battery voltage
C. Overcurrent protection voltage
D. Over-discharge protection voltage
E. Overdischarge recovery voltage
F. Self-consumption during normal work
G. Standby state self-consumption current (quiescent working current)
H. Short circuit protection time
(2) Main components used in battery protection board
Board: PCB board, the craft is divided into: Immersion gold, gold plating, nickel plating, spray tin, sinking tin, among which the gold plating process is the most complicated, and the cost is slightly higher: the color is generally divided into: green oil, black oil, butter. The board thickness is generally: 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm.
FPC board, battery protection board is generally single-sided, but also double-sided, but due to the cost point of view, various manufacturers have changed to single-sided, the general thickness is 0.1mm.
PCB board and FPC board, FPC board has the highest cost, so many manufacturers try not to make FPC board surface and use PCB board instead. ------- Flexible boards are available from 0.5 yuan to 3 yuan. According to different requirements, the price is different.
A. Ricoh Japan: RN5VM111C, RN5VM112C, R5421N11C, R5421N112C, R5421N51F, R5421N152F, RS5VG201C, RS5VG202C (for dual-cell use 168 and 338)
B. Seiko: 8241, 8261, 8491, S-8261, 8232 (used in TWO CELL 168, 388)
C. The beauty of Japanese beauty: MM1491, MM1421, MM3061, MM3077
D. Motorola: MC33349
E. Taiwan Liqi: RT9542OCER, RT9545OCER (RICH)
F. Fortune Taiwan: DW01, DW01 (Fortune)
G. Taiwan IC: A8631, A8632, 301, 302, 002B, etc.
Among the above ICs, Japan's Ricoh and Seiko EC have the best quality, and they are also used as the standard for controlling IC performance. Therefore, the price is relatively high, and Taiwan IC is the worst. -----------The price of IC in Japan is around 1.3 yuan, and that in Taiwan is around 0.8 yuan.
CET: CEM9926, CEM9936, CEM9925
SI: 9926, 6968
SILICONLX: SI9926, SI6869
Motorola: 7N02, NTQD6968
ST: 9926, 6N03V, 5N20V
SANYO: D2011, D2017
9926 is the most common, usually called thick IC, TPC8212 is the best. TPCS8201 is mainly used for 8088, 2400, 100 and other narrow circuit boards. The IC is relatively narrow and thin. It is commonly called ultra-thin IC. ------The foreign price is roughly 1.3 yuan, and SANYO's is slightly more expensive, around 1.8.
United States: DS250
Taiwan: TF2923, TF2928, TF2929, TF2933, TF2935, TF2936, TF2937
Taiwan: SC2502 etc.
Ericsson special code: 508A, 509A, the price is the highest, around RMB 5.5. TF2929 has the highest price (it is a coded IC), and Taiwan IC is the most common.
NTC (Negative Temperature Coefficient): The resistance value decreases as the humidity increases, and the function plays a protective role. The standard is 25 degrees Celsius, and the resistance value is different at different temperatures.
NCT 10K is suitable for Motorola and Ericsson.
NTC 47K is suitable for NOKIA.
For general customers, they don't require NTC for the protection board. -------The price of decoding IC varies greatly depending on the situation.