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Rechargeable lithium ion battery using common sense, application note

Release date: 2016-06-15
Browse popularity: 131

Rechargeable lithium ion battery has been widely in radio, but it is "temperamental", in use do not overcharge, discharge (can damage the battery or scrap). As a result, have protection components or protection circuit on the battery to prevent damage of expensive battery. (most of counterfeit inferior products without the protection circuit) high demand for lithium ion batteries, to ensure that the termination voltage precision is within 1%, the current major semiconductor device factory has developed a variety of lithium ion battery charging IC, to ensure safe, reliable and fast charging.

Now intercom has widespread and radio part is nickel metal hydride batteries, but to poach intercom is lithium ion battery. Proper use of lithium ion battery is very important to extend battery life. Lithium ion battery is the most widely used lithium battery, it according to the requirements of different electronic products can be made flat rectangular, cylindrical, rectangular and button, and there are composed of several cells in series with the battery pack. The lithium ion battery of the rated voltage of 3.6 v (some products of 3.7 v). Fully charged when the termination of charging voltage related to battery anode material: 4.2 v for graphite anode materials; Anode material for coke 4.1 v. Different internal resistance of the anode materials are also different, coke anode resistance slightly larger, its discharge curve also slightly different, generally called 4.1 v lithium ion battery and 4.2 v lithium ion batteries. Now use the most is 4.2 v, the termination of lithium ion battery discharge voltage of 2.5 v to 2.75 v (battery or termination of the discharge voltage, voltage range is given the parameters is slightly different). Below terminate discharge voltage continue to discharge called discharge, discharge the battery will be damaged.

Lithium ion battery is not suitable for used as large current discharge, large current discharge will reduce the discharge time (internal will produce high temperature and energy losses). So give maximum discharge current battery production factories, in use should be less than the maximum discharge current. Lithium ion batteries have certain requirements for temperature, the factory gives the scope of charge temperature, discharge temperature range and temperature range. Lithium ion battery is very high to the requirement of charging, it requires that the precision of the charging circuit to ensure the safety of charging. Termination of charging voltage accuracy tolerance for rating plus or minus 1% (for example: 4.2 v lithium ion batteries, the tolerance is + / - 0.042 v), overvoltage rechargeable lithium-ion batteries, permanent damage. Lithium ion battery charging current should be on the advice of the battery factory, and ask the limited current circuit in order to avoid happened flow (overheating). Charge rate usually used is 0.25 c ~ 1 c (c is the capacity of the battery, such as c = 800 mah, 1 c charge rate the charging current is 800 ma). Tend to detect when large current charging battery temperature, to prevent overheating damage to the battery or explosion.

Lithium ion batteries are divided into two stages: the first constant current charging, to about the termination voltage to constant voltage charge, this is a 800 mah battery, the capacity of the termination of the charging voltage of 4.2 v. Battery at 800 ma (charge rate for 1 c) constant current charging, battery voltage with a larger slope booster at the beginning, when the battery voltage close to 4.2 v to 4.2 v constant voltage charging, gradual decline current, voltage change is not big, the charging current to 1/10 c (about 80 ma), close to full, may terminate charging (some charger to start the timer after 1/10 c, after a certain time end charging). Lithium-ion batteries in charging or discharging process if happened or over-current etc. To top it off, will cause damage to the battery or reduce the service life.

Application note:

Lithium ion battery application considerations in addition to the same as the above non-rechargeable lithium batteries, also in charge should be paid attention to the following:

1. Lithium ion battery is 4.1 v and 4.1 v charging termination of different varieties, so pay attention to when charging is 4.1 v battery can't use 4.2 v charger, otherwise there will be a charge of dangerous (4.1 v to 4.2 v charger sputters charger IC is different!) .

2. The battery charging, the environment temperature cannot exceed product features the temperature range listed in the table.

3. Can't reverse charge.

4. Cannot use rechargeable nickel cadmium battery charger (three nickel cadmium battery charging for rechargeable lithium ion batteries (although the rated voltage, 3.6 v), but different charging ways, easy to cause the overcharge.

Discharge aspects should be paid attention to the following:

1. The lithium ion battery discharge current can't more than product features maximum discharge current is given in the table. When the discharge current is larger, can produce high temperature (energy loss), reduce the discharge time, unless otherwise stipulated in the battery protection components will cause overheating and damage to the battery.

2. Different temperature lowering electricity curve is different, in different temperature, the discharge voltage and discharge time is also different. In the worst - 20 ℃ discharge.

In terms of storage:

1. The battery if long term storage, keep in 50% discharge state.

2. The battery should be stored in low temperature, dry environment.

3. Stay away from heat source, also do not put in direct sunlight place. The principle of image analogy: will now principle of lithium ion battery and charging and discharging mechanism, common bubble phenomenon analogy with life. Lithium ion batteries as a heap of soap bubbles, stored inside the bubble is electricity. When charging, the bubble will be increasing with charging time extended, the bubble will burst when over the limit, at this time that damaged the lithium electricity crystal type, causing permanent damage.

When excessive discharge can cause bubble collapse and disappear, so the next time the charging bubble also filled up, and cause lithium electricity failure. How to control the bubbles don't charge blasting and bubble collapse? Is to use protection circuit must be strictly controlled. Of course, the high quality batteries and precise control circuit can greatly prolong the service life of batteries.


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