Maintenance and usage of HM lithium batteries

Prepare for equipment, power supply, B6 charger, cable, and RC lithium battery.

Plug the B6 charger into the cable and turn it on. Then connect the battery, first insert the balance head, then connect the T plug. After connecting, press the left and right option button to make the interface go to the "LiBobatt" interface, press Enter to enter.

After entering the lithium battery charging function, there are several options for fast punching and balancing. I am used to choosing a balance. Use the arrow keys to select the balance mode.

The arrow keys and the enter key adjust the parameters, press enter key selects the parameters, and the direction keys adjust the height. Here, adjust the current to 2.1, adjust to 3S, press and hold the enter button for 3 seconds, then press enter to confirm charging.

The lithium battery of the electric vehicle and the lithium battery of the model airplane are not one thing. The batteries are different, the chemical composition is different, and the maximum current of charging and discharging is different and cannot be compared. If the lithium battery of the model is charged in series, it is easy to over-current, and the characteristics between the multiple cells may not be completely consistent. The series charging will cause the voltage of each cell to be unbalanced or even charged. The principle of balanced charging is very simple. For example, the battery of 3S is composed of three 3.7V batteries connected in series. After fully charged, each battery is 4.2V, and the whole is externally 13V. The balanced charging will convert AC power and rectify to obtain 13V DC. Three electrolytic capacitors and voltage equalizing resistors are divided into 13V, and each capacitor has 4.33V. Then, using a triode as a simple closed-loop circuit, the charging switch and current can be controlled, so that three batteries can be used, independently charged.

The so-called balanced charging is the charging of the characteristics of the balanced battery. It means that during the use of the battery, the battery terminal voltage is unbalanced due to individual differences in the battery, temperature differences, etc., in order to avoid the deterioration of the imbalance trend, it is necessary to increase the battery. The charging voltage of the group is activated and charged. The main reason is that the battery life is longer. The actual electric vehicle is the balanced charging voltage of 48v and the charging voltage is charged by 60v.

To buy a special lithium battery charger, if you use 2S, 3S, 4S ... then you need to balance the charge, just charge one piece. It will be enough, after buying the charger will have instructions.

If you do not buy a charger, you can also use the mobile phone charger to charge, you need to solder a battery head, rush one by one, pay attention to the charging time cannot be too long, the mobile phone charger output voltage is 5V, greater than the battery saturation voltage 4.2V, Otherwise it is easy to damage the battery

Generally, the minimum voltage of the alarm is set to 3.3V. If it is low, it will be over-discharged. When the battery is fully charged, the power can be cut off. Lithium batteries are not like nickel-metal hydride batteries, they can't be put out of power, and they can be used as needed. Generally, the 4000 MAH lithium battery is fully charged with a balanced charge for about 6 or 7 hours, and the balance is charged with an indicator light. The large-capacity battery recommends that you use the B6 charger, the charging speed is fast, you can set the charging voltage, and you can repair it after the over-discharge. Try not to over discharge, sometimes the repair fluid is gone.

After we get a lithium battery, don't rush to charge it. This is blind. Before using this, you must carefully read the battery specifications. The charging current, voltage and charging temperature must not exceed the standards written in the specification. So what can happen if the standard written on the specification is exceeded?

1. Using more than the recommended current charging may cause problems with the battery's charge and discharge performance, mechanical properties and safety performance, and may cause heat or leakage, which will greatly reduce battery life.

2. The charging voltage is higher than the recommended voltage, which may cause the battery to be overcharged. Generally, it is caused by the user's wrong charging method (such as DC charging). The figure shows the most serious consequences of using DC overcharging.

3. Charging temperature, first of all, the charging temperature here refers not to the temperature generated during battery charging, but the ambient temperature during battery charging. When the battery surface temperature is found to be abnormal, the charging should be terminated immediately.

Discharge articles:

1. Discharge current: The discharge current must not exceed the maximum discharge current specified by the battery (the formula is “MA ÷ 1000 and then multiplied by C number” = limit discharge current.) Excessive current discharge will lead to a sharp drop in capacity and cause the battery to overheat and expand. . In the popular words of the model friends, don't pump the battery too hard, so even if it is not put, the battery life will be significantly reduced.

2. Discharge temperature: The battery must be discharged within the operating temperature range specified in the data sheet. When the surface temperature of the battery exceeds 60 ° C, temporarily stop using it until the battery cools to room temperature.

3. Over-discharge: Over-discharge will cause devastating damage to the battery, so it is best not to make the voltage of the single-cell battery lower than 3.7V during discharge.

Battery storage articles:

The battery should be stored in a cool environment. When storing the battery for a long time (more than 3 months), it is recommended to place it in an environment with a temperature of 10-25 ° C and low temperature and no corrosive gas. The battery is charged and discharged every 3 months during long-term storage to maintain battery activity and ensure that each cell voltage is in the range of 3.85V.

Finally, if a battery is not intended for use in the short term, remember not to fully charge it before saving it, which makes it easy to have a battery drum during the storage process. The best storage method is that the optimal storage voltage is about 3.8V for a single piece.

The reasons for the expansion of different types of batteries are different. In summary, the reasons for the expansion of rechargeable batteries are mainly due to the following reasons:

1. Battery protection circuit is defective

2. The battery has no protection function and the battery core is inflated.

3. Poor charger performance, excessive battery charging current causes battery expansion

4. The battery is continuously overcharged by high rate and high current

5. The problem of the design of the battery itself may also occur. The main reasons for the battery expansion are:

a, raw materials are not pure

b, electrolyte precipitation

c, the storage place is humid

Lithium battery use test (mobile phone battery as an example)

If the user wants to extend the battery's effective use time, in addition to the quality of the charger, the correct charging technique is also necessary, because poor quality charger or wrong charging method will affect the battery life and cycle life. Here are the charging tips compiled by users:

1. Before the battery leaves the factory, the manufacturer has activated the process and pre-charged it. Therefore, the battery has surplus power. Some friends say that the battery is charged according to the adjustment period. The standby is still seriously insufficient. If the battery is a genuine battery, this kind of in the case, the adjustment period should be extended and then 3-5 full charge and discharge.

2. If the newly purchased mobile phone battery is lithium ion, then the first 3-5 times of charging is generally called the adjustment period, and should be charged for more than 14 hours to ensure full activation of lithium ion activity. Lithium-ion batteries have no memory effect, but they are highly sturdy and should be fully activated to ensure optimal performance in future use.

3. Before charging, the lithium battery does not need to be specially discharged. If it is improperly discharged, it will damage the battery. When charging, try to charge slowly, reduce the fast charging mode; do not exceed 24 hours. After three to five full charge and discharge cycles, the internal chemicals will be “activated” to achieve the best results.

4. Please use the original factory, or a good brand reputation of charger, want to use lithium battery chargers for lithium-ion batteries, and follow the instructions, otherwise it will damage the battery, and even dangerous.

5, there are a lot of users are often in charge when the phone open, actually such life will be very easy to hurt my cell phone, because in the process of charging, the phone's circuit board will be fever, at this time if there is a foreign phone, may produce instant return current, the damage to the inside of the mobile phone parts.

6, the life of the battery is determined by the number of repeated charge and discharge, so should try to avoid charging when the battery has surplus power, which will shorten the battery life. When the phone is turned off for more than 7 days, the battery of the phone should be completely discharged and fully charged before use.

7. When charging, the longer the time, the better. If the battery without the protection circuit is full, stop charging. Otherwise, the battery will affect performance due to heat or overheating.

1. How to charge a new battery

In the use of lithium batteries, it should be noted that after the battery is placed for a period of time, it enters a sleep state. At this time, the capacity is lower than the normal value, and the use time is also shortened. However, the lithium battery is easy to activate, as long as the battery is activated after 3 to 5 normal charge and discharge cycles, and the normal capacity is restored. Due to the characteristics of the lithium battery itself, it is determined that it has almost no memory effect.

Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only in theory, but from my own practice, it is best to use a standard method of charging this "natural activation" method from the beginning. For the "activation" problem of lithium batteries, many claims are: charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement that "the first three charges have to be charged for more than 12 hours" is obviously a continuation of nickel batteries (such as nickel cadmium and nickel hydride). So this kind of statement can be said to be misinformation at the beginning. The charge and discharge characteristics of lithium and nickel batteries are very different, and it is very clear to tell you that all the serious formal technical information I have reviewed emphasizes that overcharge and over discharge will make lithium batteries, especially liquid lithium. Ion batteries cause great damage. Therefore, charging is preferably done in accordance with standard time and standard methods, especially for ultra-long charging of more than 12 hours. Usually, the charging method described in the mobile phone manual is a standard charging method suitable for the mobile phone.

In addition, the lithium battery phone or charger will automatically stop charging after the battery is fully charged, there is no so-called “turbulent” charging that the nickel battery charger has for 10 hours. In other words, if your lithium battery is full, it will be white charger on the charger. And none of us can guarantee that the characteristics of the battery's charge and discharge protection circuit will never change and the quality will be foolproof, so your battery will be on the edge of danger for a long time. This is another reason why we oppose long charging.

In addition, on some mobile phones, after charging for more than a certain period of time, if you do not remove the charger, then the system will not stop charging, and will start the discharge-charge cycle. Perhaps the manufacturer of this approach has its own purpose, but it is clearly unfavorable for the life of the battery and the phone/charger. At the same time, long charging takes a long time and often needs to be carried out at night. In the case of China's power grid, the voltage at night is high in many places and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and they are much less resistant to fluctuations in charge and discharge than nickel, which in turn poses additional risks.

In addition, another aspect that cannot be ignored is that lithium batteries are also not suitable for over-discharge, and over-discharge is also disadvantageous for lithium batteries. This leads to the following problem.

2. When should I start charging during normal use?

On the Internet, you can often see this statement, because the number of charge and discharge is limited, so you should recharge the battery of the mobile phone as much as possible. But I found an experimental table on the charge and discharge cycle of lithium-ion batteries. The data on cycle life are listed below:

Cycle life (10% DOD) : >1000 times

Cycle life (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

If converted to the actual total capacity of the charge: 10% * 1000 = 100, 100% * 200 = 200, the latter's full charge and discharge is still better, but the previous user's statement to do some correction: in normal circumstances Next, you should reserve the charge according to the principle that the remaining battery power is used up and recharge, but if your battery is not likely to stick to the whole day on the 2nd day, you should start charging in time, of course, if you are willing to carry it. The charger is in the office.

And you need to charge to cope with the expected important events that will cause the communication to be busy, even if the battery still has a lot of power, then you only charge in advance, because you have not really lost "1" charge cycle life. That is, "0.x" times, and often this x will be small.

The principle of recharging the remaining battery power is not to go to extremes. One of the more widely spread sayings like long charging is that "try to run out of battery power, it is best to use automatic shutdown." This practice is actually only a nickel battery. The purpose is to avoid memory effects, 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. As a result, the mobile phone in this example did not respond during the subsequent charging and booting, and had to be sent to the customer service for repair. This is actually caused by the battery being over-discharged and the voltage is too low, so that it does not have normal charging and power-on conditions.

3, the correct practice for lithium battery mobile phones

To sum up, my most important tips on the charging and discharging problems of lithium battery mobile phones in use are:

1. Charge according to standard time and procedures, even if it is the first three times;

2. When there is a low battery power prompt, you should start charging as soon as possible;

3. The activation of the lithium battery does not require a special method. The lithium battery will naturally activate during normal use of the mobile phone. If you insist on using the "first three 12-hour long charge activation" method, it will not actually work.

Therefore, all the pursuit of 12 hours of ultra-long charging and the use of lithium battery mobile phones to automatically shut down is wrong. If you have done it in the wrong way, please correct it in time, maybe it is not too late.

Of course, in the case of good quality of the mobile phone and charger protection and control circuit, the protection of the lithium battery is quite guaranteed. So the understanding of the charging rules is the focus, and in some cases it is also possible to make some concessions. For example, if you find that the phone must be charged before you go to sleep at night, you can also start charging before going to bed. The point is that you should know what the right approach is and don't deliberately follow the wrong way.

The page contains the contents of the machine translation.