Pros and cons of lithium-iron battery

Pros and cons of lithium-iron battery

Lithium-iron battery by using different materials and processes, as well as stringent quality laptop battery control in varying degrees, but had a great difference. In particular, a greater difference in price. Some difference between high and low prices or even nearly twice as much.

Why is there such a large difference in Na? Also why lithium iron batteries will be so expensive good na? One difference there? How to choose?

The production of lithium-iron battery on the environment and production process requirements are more stringent, a neglect of non-performing rate of slightly will improve immediately; To reduce the price it had to lower quality standards. Because of this, some grade B or even C grade will flow to the market. As the lithium-iron battery is still a relatively new product, many buyers now do not know how to tell whether this is also, therefore, would like to provide some distinguishing characteristics of this method and the importance of the battery pack for your reference.

Lithium-iron battery is good or bad judgments, the most basic points that can be analyzed from 02K7054 the following:

1. Uniformity

Battery hardest to do is homogeneous, but the most important of the battery string is also homogeneous. If the 10 batteries strung together, there is a first to reach over-discharge protection standards, while several others are still sufficient power, then this string of battery pack that can power capacity is not the entire lower? Has been achieved with a first place is the same reasoning.

The lack of uniformity of the battery pack, without the added protection board is very easy to broken, it is easy to overcharge or over-discharge; have unprotected board battery pack can be more you use electricity capacity will also be lower. This is also a lot of batteries plant has launched production of batteries, but was not required to group string of product causes. Because to achieve uniformity in the entire manufacturing process control is to be very strict.

Simple test method: Series 4 batteries, so 1C and 3C charge-discharge, and concept of charge-discharge process of investigation, all the voltage ThinkPad A20 batteries to see if differences in lifting the situation will know. If a row 4,5 times better to do.

2. Self-discharge rate

Lithium iron battery self-discharge rate, the theoretical value should be less than 2% per month, more than this value is not a good battery. Is not a process problem is to use the material in question.

Low self-discharge rate has always been the characteristics of lithium-iron battery, if the self-discharge rate, when you install a good finished product delivered to customer sites, it had no power, and customers will feel? Furthermore, also on behalf of a lot of energy wasted.

String in the group context, it will affect the balance of battery, that is, the battery pack that can power capacity will be less and less, and that battery life will be reduced.

Simple test method: Take 10 approximately equal to the capacitance of the battery, charge saturation put it aside for a month's time after power-up, and then measure the capacitance value to calculate the self-discharge rate ThinkPad A20M. (Put it aside after recall what the amount of voltage value, than what the battery voltage changes.)

3. Charge-discharge rate (Charge C-rate)

Fast charge and discharge is actually one of lithium-iron batteries, one of the most advantageous features, because of its fast charge and discharge, and thus allowed very similar features and a super capacitor, but its super-capacitor big capacitor than several hundred times. If the charge-discharge characteristics of its fast enough, the use of lithium-iron battery is not much significance.

In general, good quality lithium-iron battery, the charging speed of the 3C (about 20 minutes charge saturation power), while the discharge rate can reach 30C. Have special requirements can attain a higher magnification of the charge and discharge. The above situation is not hurt battery life is the premise.

Simple test method: that is, in order to manufacturer's specifications can be used to test the maximum charge-discharge rate; if the testing process, ThinkPad A21M batteries heat very serious, then the quality of the batteries is not very good.

4. Cycle life

In general, the user can not be measured, and can only trust the data provided by the manufacturer, or appointed by a professional unit on behalf of the measure. Good quality lithium-iron batteries, in 3000 the use of 1C charge and discharge cycles, its electricity capacity, attenuation, will be less than 15%.

In short, the lithium iron battery to dolphin alone, the problem spots are not large; but after the series-parallel connection to use, then the features described above should pay special attention to the. Especially in the high-voltage large-capacity battery electric strings in the group, but also pay special attention to the quality of ThinkPad R60 batteries.