Decided to move the power of good and bad two major components: batteries and PCB board
Batteries: There are two kinds of 18650 and polymer, lithium cobalt oxide 18650 usually liquid lithium-ion polymer usually solid or colloidal nickel cobalt manganese ions. Click here for special instructions, 18650, is not so dangerous online said, this poor resistance to high temperature batteries in extreme high temperature circumstances will an explosion, and how to control the temperature, is that the PCB circuit design and the battery itself resistance heating, for a regular manufacturers of 18650 and a complete PCB circuit board, it is generally okay. Many laptops, rechargeable batteries, digital camera batteries are used in 18650, if it will explode at any time, it is not should all throw?
Common 18650 and polymer batteries, PCB board: with lots of small parts supply / charging chip, boost chip protection circuits, capacitors, etc. These small parts for battery conversion rate and discharge stability plays a key role in the quality of these functions need to use specialized equipment to test it out, we can see that the circuit is clean, the layout is reasonable, there are good and bad capacitor, the capacitance of the most widely used at present, there are three: electrolytic capacitors, tantalum capacitors , ceramic capacitors, in ascending order of quality, are currently used in most mobile power supply electrolytic capacitors, this capacitor in extreme environments easy to aging, breakdown, leakage, tantalum and ceramic capacitors this problem does not exist. Capacitors on the PCB's role is filtered to ensure stable output current, we can think of the current instability on the phone continue to charge what impact? Specific estimates can not tell, but the answer is definitely not good.
1, try to choose the appearance of solid workmanship mobile power (personally think that if an explosion, or at least reduce the power point)
2, if you select 18650 mobile power, capacity options try not to over 12,000 mA, too, and in extreme cases, explosion up powerful, single cell made so as not to over 2800 mA, because the current domestic goods production process, more than this number of mAh battery in terms of anti-attenuation and dispersion to be worse.
3, try to choose a regular indicate the source of the 18650 and polymer mobile power, but at present there is little domestic battery manufacturers indicate the source, as long as the regular factory on the line, from the appearance, difficult to distinguish between polymer and 18,650, because many uses aggregation objects by multi-layered structure composed piece, but if the thin, must be polymers, too thick, although difficult to distinguish, but the price should be able to tell you some information.
4, do not be too superstitious sales on Taobao, Taobao sales of over a million are usually high-capacity, low cost, low selling price of mobile power, this part of the product by the majority of users blitz. We must remember that you pay for this sentence, it means that low-quality low-cost, domestic mobile power batteries are similar, and many manufacturers to reduce costs, the use of 18650 There are several extreme tactics:
1, the old batteries
2, poor quality batteries
3, PCB board materials and poor design is not complete and does not provide over-voltage, over-charge, over discharge, over current, short circuit protection, overheating and six basic protection functions
4, low capacity battery virtual standard capacity 18650 hundreds capacity to more than two thousand mA range, made 2000 mA or less is more stable, more than 2400 mA high price, if someone saw 2600 mA, the price is low, and that the basic part of this. .