Why do lithium batteries cause accidents?

A lot of people are afraid of lithium battery, but also helpless. Helpless because cell phones, laptops, tablet and so on equipment are used it, afraid because I don't know which day lithium battery will suddenly make terrorist attacks: in front of your face or burning, or explosion. This case, natural is associated with the electrical characteristics, quality of lithium battery itself, but does not rule out, whether it is right to use the lithium battery, is also one of the reasons for lithium battery accident.

The correct way of using the lithium battery of lithium battery

Method is based on the characteristics on the basis of lithium battery itself.Therefore, we first came up from electrical to analyze why the lithium battery explosion or burning.The combustion or explosion, usually because of heat accumulation and cannot spread out, the cumulative to the fire, or heat accumulation within a certain amount of space to a certain degree, will happen.As a battery, and, in the aggregate, the above situation is usually not the following four reasons.

1, internal short circuit (mostly mild package large monomer) : a structure or process defects lead to a ear interpolation, diaphragm packages too little surplus, burr, a discount on the diaphragm.Very often appears in the thick ear interpolation within the cell and parallel structure, pole ear insulation does not reach the designated position, in the subsequent product plus protection board or use process is easy to cause acute short-circuit and internal combustion or blast (internal short circuit: this man is have deep experience, then scrap more than 2 k the batteries, the actual essence belongs to a design flaw - the anomaly is: acute internal short circuit), but now this situation is very few, unless the external force factors.

2, external short circuit: 1 ah battery under external combustion after explosion caused by short circuit, usually appear to bulge or simply put the ears burn out, and the individual is analyzed power battery or large capacity battery short circuit caused by burning.This involves the customer use undeserved, install metal outer ear insulation, don't consider when abnormal occurs at the scene of the installed battery smoldering combustion;Power battery is lack of common structure fixed measures (ill-considered), the user use process battery shake battery external insulation protective film breakage or the cable skin damaged, eventually lead to short circuit burning.

3, overcharge explosion: this is the most dangerous, is also the most afraid of, but, still occasionally appear.From know there are two conditions: a, the user is not required to use the matching chargers, undermining protection circuit and charging users often are unlimited filling, this situation is not fry are difficult;Group b, the battery is not reasonable and protective plate failure, this case will fry a mess...Single battery in the same way.

4, battery material itself does not pass.Material does not pass, may produce overheating in calibration voltage electrical flow, thus accident.

Based on the above analysis, if you can correct use of lithium-ion batteries, as far as possible to avoid the above situation, you can find some methods to:

1, frequent deep cycles: the lithium battery almost no memory, a lot of friends in the use of lithium trams, or electric digital products, like not to use power in a little (protection board) and then to charge, and in many people's eyes, which also is a kind of to activate the battery.In use of lithium batteries, we called the run out of battery recharging case depth charge and discharge.

In fact, the depth of the charge and discharge is a lot of people in the use of lithium battery when a significant error, scientists have come to the conclusion through the experiment, the depth of the charge and discharge frequency in the case of other environmental condition of constant, and battery life is proportional to the charge and discharge can lead to an early end to the battery life many times.And long service life of the end of the lithium battery is easy to cause the battery to bulge, etc., to explode.

2, overcharge and high charge and discharge, the situation is in the protection board design is not reasonable and the charging time will often happens, we always like in the device's battery is full charge again after a while, let oneself of the equipment can resist longer, but many people do not know is that long-term over charge and discharge conditions can have serious injury and damage the performance of lithium batteries, serious can cause extreme cases such as explosion, so the battery is full of good, if has been plugged in the charger, sooner or later will be a tragedy.

3, at the time of charging and discharging to general current load current of the charger and use electrical appliances within the prescribed scope, high current load is easy to cause the battery internal short circuit, undermining lithium ion, the safe hidden trouble that trigger circuit.Similarly, for plug-in charger voltage, truth is the same.And we should pay attention to when using the charger charger whether qualified.

4, the work environment.Lithium batteries are extremely sensitive to temperature, if the below freezing for a long time use, can greatly influence and damage to the battery life-span.While on overheating environment for a long time, will significantly reduce the battery life, serious, explosion caused by inner pressure increase, even if they failed to explode, the battery will quickly scrapped in high fever, feeling some cases because the pool of explosions that killed, most of the reasons is because the working environment of high temperature.

After several times after the accident, the manufacturer also finally had the action, for the most current manufacturers are increased protection especially electronic digital products have increased double or multiple protection, try to avoid this from happening, users increased awareness of their own, however, is still very important.

The correct way of using the lithium battery of mobile phone lithium battery

Although lithium batteries, widely used in automobile, electric cars, mobile phones, tablet, notebook, and so on are useful to the equipment, in the near future, maybe have more equipment to use it, but for now, equipment, such as cell phones and tablet, is still the nearest lithium battery power supply equipment.Therefore, it is necessary to make special instructions to cell phone lithium battery.

1 how to charge

That should be paid attention to in using lithium battery, battery placed after a period of time to enter a dormant state, capacity is lower than normal at this time, use time is shortened.But the lithium battery is easy to activate, if after 3-5 times the normal charge and discharge cycle can activate cells, back to normal capacity.Due to the characteristics of lithium battery itself, determines its almost no memory effect.So new lithium-ion batteries in the user's phone in the process of activation, is don't need special method and the device.Is so in theory, not only from my own practice, from the start with a standard method to charge this way of "natural activation" is the best.For the "activation" of lithium-ion batteries, many say: charging time must be more than 12 hours, if you do this three times, in order to activate the battery.This "the first three time charge to charge more than 12 hours", apparently from nickel battery, such as nickel cadmium and nickel metal hydride) continue down.So that, the outset misinformation, so to speak.Lithium-ion and nickel batteries charging and discharging characteristics have very big difference, and can be very clear tell you, I have looked at all serious formal technical data will emphasize overcharge and over discharge of lithium batteries, especially in the liquidLithium ion batteriesCaused great damage.And charging in accordance with the best charging standard time and standard methods, especially don't charging for more than 12 hours long.Usually, the introduction of charging method, on the phone's manual standard charging method is suitable for the mobile phone.

In addition, the lithium battery cell phone or the charger will automatically stop after the battery, there is no nickel electric charger of the so-called "trickle charging for 10 hours.That is to say, if your lithium battery, after full on the charger is Bai Chong.And none of us there is no guarantee that the battery charge and discharge protection circuit will never change and quality according to the features of foolproof, so your battery will be on the brink of danger for a long time.This is another reason we object to a longer charge.Charging in addition on the phone for some, after more than a certain amount of time, if you don't go to remove the charger, the system does not stop charging, will also begin to discharge - charging cycles.Perhaps this vendor has its purpose, but apparently for life of battery and mobile phone/charger is unfavorable.At the same time, the charging takes a long time long, often need to be done in the night, and to power grid in China, many places are relatively high voltage in the night, and volatile.Have already said, in front of the lithium battery is very delicate, it is better than nickel electric resistance to fluctuation in charging and discharging ability worse, so it brings the risk of additional.In addition, another aspect can not be ignored is the lithium battery is also not suitable for discharge, over discharge to the lithium battery is bad also.This leads to the following questions.

2 when in normal use should start charging

On our BBS, often can see this statement, because the number of charge and discharge is limited, so should be mobile phone battery electric light recharging as much as possible.But I find a lithium ion battery charge and discharge cycle experiment table, the cycle life of the data are listed as follows:

Cycle lifetime (10% DOD) : > 1000 times

Cycle lifetime (100% DOD) : > 200 times

The DOD is the abbreviation of the depth of discharge.From the table, but the depth of the number of charging and discharging, 10% DOD cycle life than 100% DOD much longer., of course, if the conversion to the actual charge relative to the total capacity: * 1000 * 200 = 200 = 100100%, 10% of the latter to fully charge and discharge is still relatively good, but in front of the net friend of the idea to do some correction: under normal circumstances, you should have a reservation, according to the principle of battery remaining power run out to refill charging, but if your batteries in your expected to 2 days can't insist on the whole during the day, it should start charging in a timely manner, of course, if you are willing to carry the charger to the office when BieLun again.And you need to charge for the upcoming is expected to lead to the communication of the most important events in the busy, even when there are a lot more than battery, so you can just charge in advance, because you didn't really lose "1" time charge cycle life, namely "0. X", and often the x will be small.The principle of battery remaining power run out to refill is not want you to extremes.As widespread and long charging a saying that is "as far as possible put the cell phone battery power run out, had better use automatic shutdown".The practice of this kind of practice is just nickel batteries, purpose is to avoid the memory effect, unfortunately it also in lithium battery of circulating on today.Once someone because the cell phone battery low warning, without a charge to continue using has been used examples of automatic shutdown.The result from this example phone no response in the later charging and boot, had to send to the maintenance of the service.This is because the battery voltage is too low, caused by the excessive discharge that do not have normal charging and boot conditions.

Three important for the proper use of lithium battery cell phone

Boil down to, I on the problem of lithium battery cell phones in use is the most important tip:

1, according to the standard time and procedure charging, even so will three times before;

2, when there is a hint when battery power is too low, should try to start charging in a timely manner;

3, the activation of the lithium battery does not need special method, in the normal use of mobile phone lithium batteries will naturally activation.If you are determined to use of "three times before 12 hours long charging activation" approach, in fact there will be no effect.Therefore, all the pursuit of 12 hours long use the lithium battery cell phone charging and automatic shutdown, are wrong.If you've made according to the error, please correct in time, maybe it is not too late.Of course, in the mobile phone and charger itself under the condition of good quality, protection and control circuit for lithium battery protection still has quite a guarantee.So the understanding of charging rules is the key, in some cases, also can make some concessions.Such as you find mobile phone must be charge before you sleep at night, you can also start charging before going to bed.The crux of the problem is that you should know what is the right thing to do, and do not deliberately according to error.

The correct way of using the lithium battery of battery maintenance

Actually the battery without too much consideration on the use of attention, in other words is also not too helpful.How many times a cell can use, difference between individual differences in more from the battery itself, instead of using the method.In addition to the quality of battery, the service life of the battery itself is limited.Once the battery off the production line, its life started to pass.Whether or not you use it, the service life of lithium-ion batteries are only in two to three years.Battery capacity decline in one of the important reasons is caused by the oxidation of internal resistance increases, the cell resistance can reach a certain point, although a full battery at this moment, but the battery can't release already stored power.Many friends think first use lithium battery should be charged more than 16 hours, so that we can fully activate cells, actually do not according to, this is just the popular Ni-Mh or nickel cadmium battery charging method, is not suitable for lithium ion batteries.Because of this with a core of lithium polymer batteries, in theory, no memory effect, even if have, also is completely negligible.So just rushing around 3 hours is ok, if charging status has been completed, and the power converter is temporarily do not need to use, you can unplug the power and don't have to wait so long.

In fact the battery maintenance has always been the hot topic of laptop users, and in each big laptop battery section of BBS, this topic already formed the consensus.But in fact the misunderstanding here very much, in the final analysis is from two aspects, one is "thinking hasn't caught up with nickel metal hydride battery to lithium batteries", more funny, another is from mobile phones, because the mobile phone is actually the most users come into contact with the earliest use rechargeable battery equipment repeatedly, so will take it for granted some of your phone habits extends to the PSP.I didn't ability the most PSP users trained specialists, and also does not have the necessary.There is no absolute truth, I don't like some theory is only friends, promised to say his theory must be correct, and to convince everyone to him, I just at major notebook BBS and electrical appliance industry will generally recognized by the senior engineer's point of view to share with you.Ultimately, the PSP is consumables, no matter how hard you tried, in the service life of battery only in 2 ~ 3 years.If you feel that in order to bring the PSP batteries has little to almost no effect of so-called maintenance method, willingly to gather together often interrupt the game fully charge and discharge time, waiting for charging, that you don't need to continue to look down.

Here I put some of the most easy to clarify the misunderstanding, and I think the correct ideas and practices are presented.

Myth: PSP buy requires repeated three times in order to activate the battery charging and discharging.Unless you buy the PSP is the inventory of products more than one year, otherwise there is no need to do this, because now the batteries have been activated in the factory, the batteries when encapsulated into a PSP batteries after an equivalent to activate test again, so you get its hands on the battery, already had been activated, only three times of charging and discharging process cost anymore to increase the wastage of the battery.

Erroneous zone 2: for the first time charge must be sufficient enough for 12 hours.For the those without early control circuit of Ni-Mh battery equipment is applicable, but for now has a smart charging and discharging control module of the PSP is a joke, when the PSP batteries, the charging current can be automatically cut off, and when the system is shown as "external power supply.Even if you continue to 120 hours, filling state also won't have any change, in general, is completely filled with 3 hours, the rest of the "charging" is just wasting your time.Is the time to get a new machine instead should put power rechargeable light.

Myth 3: cells need once a month completely charged.For Ni-Mh battery memory effect is very strong, this is must work, but for lithium-ion batteries, the cycle is too frequent, lithium battery, in theory, is to eliminate the memory effect, even if there were, also has been greatly weakened the negligible degree, if you use the battery is very frequent, then you should discharge the battery to the low (about 10 ~ 15%) recharging, but if the discharge to even open machine (0 ~ 1%), belong to the lithium battery has great damage depth of discharge, usually once every 2 months to do this operation.If you rarely use the battery, as long as once every 3 months for this operation.

Myth 4: charging while work or charging will continue to use after the completion of the power converter can damage the host and the battery.This is one of the most ridiculous argument.So-called cavity electronics, time filling the theoretical arguments on the level of mechanism, such as how much you can learn in the actual reaction?Battery industry academic view of the first is not unified.Theory still have differences, how to guide consumers to use the actual?Battery consumption is divided into normal loss and damage loss, the power converter using and the degree of loss of charge while using the real cause, completely within the normal wear and tear, the battery that is to say, no matter how theoretical maintenance measures system, battery is aging, it's like how the magic of cosmetics and maintenance also can not stop the beauty become old woman, most are just slow, but on the surface of the plaster of utility can exactly how many truly, this is by no means theory can explain the actual use experience is correct - respect and understanding of the scientific concept.Maybe someone says, the only way to avoid the battery aging is not used, so a lot of people will choose to take down the battery), but would make PSP portability loss of meaning, and secondly the battery even in the condition of storage, and over time and natural aging.Battery is actually a half comsumption products, as long as the battery has brought convenient enough for you and happiness, I think they sacrifice is valuable.

Error, nature is because have corresponding universal battery maintenance and use of the method, listed below:

1. Avoid completely discharge power (used to black screen)

2. Often to the lithium battery charge and discharge, charge when not put or use an external power source, charging while using, continue to use after the completion of external or charge, all the battery will not cause additional loss.

3. When not in use for a long time, should remove the lithium battery, in a cool and dry place.Don't freeze, avoid water erosion.Avoid car use in high temperature.Such as long time preservation, place after the battery to 40%

4. As a laptop users, if most of the time is to use a fixed power supply, can remove the battery in shade, but this is only for the battery to improve the environment factors such as temperature, humidity, etc.For the PSP, with batteries using the power converter is not cause additional damage to the battery.And for portable and protecting the battery cover, the metal contact the idea, is not recommended because of using an external power supply, remove the batteries.

5. Avoid buying spare lithium batteries for storage, because the battery even if does not use, its service life is also in the natural fracture, so the battery within the limited time to live, utmost ground USES is to reflect the value of the battery, rather than using a variety of practical theories to torture yourself and to entertain the PSP.

The page contains the contents of the machine translation.