Simple lithium battery charge and discharge protection circuit research question and answer

Source: 2020 - 04 - 12 clicks and: time ask: hello, I studied the lithium battery charging requirements and instructions on the use of the IC chip. Your circuit is very good, because lithium battery protection circuit. But don't know if you have noticed that some do not use for a long time, or did not cause any discharge protection circuit of lithium battery, charging, if less than 3 v voltage, according to the need, should be no more than 3 v, 25 horses awakens the charging current, voltage 3 v, such as the normal fee, so I can fill it with protection circuit in the lithium battery discharge, what do you think? In my analysis of the data and MAX846A should be the best charging chip design: 2. Lithium batteries and other types of battery can be charge; 3. There are four different stages of charging; 4. Peripheral component is not a lot, but I have 5 - hand 6 for patch seal, there is a teacher and I have a dispute, so I can't weld it in his spare time. A: this is good advice. I will add wake up in the back of the circuit. Without this function, only the manual measurement, does not conform to the requirements of simple, or manually change the small current to charge ( Because the current can be adjusted) 。 Race, of course, some people say, circuit will become more and more complex and MAX846A really is very good, very normal, but in addition to the amateur welding condition is bad outside, don't know how to price, easy to buy? In addition, the circuit does not support more than 3 or 3 blocks of lithium batteries, right? Q: is the use of lithium-ion batteries in order to protect the plate, pop, on the other side of death. Use protection board charge much easier. When you eat, it will stop when you take it. Answer: the problem is to give each part of the lithium ion battery how much is the cost of installing protection circuit, how long does it take to production, some 10 X10 lithium battery protection board, 10 days of lithium battery constant current, constant voltage charger, who are more likely to DIY, who can spend the least meters, easier to DIY, discharge protection is a must, of course, otherwise after discharge, lithium battery. Q: it's not every day protection plate, as a whole, discharge voltage, in fact, one of the most commonly used part, the second part and the three problems, in parallel, 1 - Section 3 guard the relationship between the maturity and cheap, 1 eight feet of double field effect tube, only 1 5 teaching control IC, 2, 3, resistance, only add the fuse. A: another lithium battery charging termination voltage, 4. 2 V, 4。 1 V or other, not too big significance, because the consistency of lithium-ion batteries is bad, so can't charging series, so the termination of the lithium battery voltage is not completely the same, so I think the termination voltage than 5% lower than 4. 2 V, the battery fully rushed to 100% and not reality, also is not necessary in the actual application, lead to the complexity of the charging circuit, this wisdom is the design of the building, the component of cumulative error, will lead to greater error, this is not desirable for DIY, if the circuit of figure 1, cut-off can be precisely controlled less than 5% of the maximum voltage of lithium-ion batteries, protective circuit can be ignored, termination voltage is set in 4. 00 should be very safe. A: serial charging test each battery voltage respectively. As long as a full battery section, it will power outages. This method is enough. If they are already full, full discharge to N escape to charge and discharge path, and down work in the big electric charge and discharge circuit, power problem is much more difficult than the detection circuit. For instance, a 4. 2 v voltage adjustment tube with each battery in parallel, is only applicable to small current charging.