Experts talk about the right laptop battery charging and use of
We love machine How lithium battery maintenance to be correct? This problem has plagued many loyal users of laptop computers, including me. In access to some information, have the opportunity not long ago an electrochemical professional advice at the time of Dr. and a well-known domestic battery, deputy director of the Institute. The recently acquired a number of relevant knowledge and experience to write out to satisfy your readers.
Lithium-ion battery cathode material of lithium are usually composed of the active compounds, the negative electrode is a special molecular structure of carbon. Common cathode materials for major components of LiCoO2, charging, the increase in the bipolar battery of the electric potential positive force the release of lithium-ion compounds, embedded negative elements were arranged lamellar structure of the carbon. Discharge, the lithium-ion from the lamellar structure of the carbon in precipitation, and re-cathode combination of the compounds. Lithium-ion movement have had a current.
Although the principle of chemical reaction is very simple, but in the actual industrial production, the need to consider much more practical issues: the needs of cathode material additives to maintain the charge on many occasions put the activity, the need for negative electrode materials at the molecular level to design the structure to accommodate more lithium ion; fill in the electrolyte between the positive and negative, in addition to maintaining stability, but also need to have good electrical conductivity, reducing the battery internal resistance.
Change the shape of a variety of notebook batteries
Although few lithium-ion batteries Ni-Cd battery memory effect, memory effect is the crystallization of the principle, in the lithium batteries will not have nearly such a response. However, lithium-ion rechargeable battery in a number of post-release will continue to decline in capacity, its causes are complex and diverse. Anode material is mainly the change itself, from the molecular level, is negative on the hole to accommodate the structure of lithium-ion will gradually collapse, plug; from a chemical point of view, is a passive activity of anode materials are there to form a stable reaction of the other compounds. Physics will emerge gradually falling off the cathode material, etc. In short, the end can reduce the freedom of battery charge and discharge process of lithium-ion mobile number.
Over-charging and over-discharge, the lithium-ion battery cathode is caused permanent damage, from the molecular level, can be an intuitive understanding of the excessive discharge of carbon anode will lead to excessive release of lithium ion and allow its lamellar structure collapsed, over – rechargeable lithium-ion would be too much hard carbon anode into the structure going, and makes some lithium-ion can no longer be released. This is why lithium-ion batteries are usually equipped with charge-discharge control circuit of the reasons.
Not suitable for the temperature, will lead to an internal lithium-ion batteries to generate other chemical reactions that we do not want to see the compounds, so a lot of lithium-ion batteries are among the negative control with protective membrane or electrolyte additives. The battery reaches a certain temperature, the composite membrane electrolyte membrane hole closed or degeneration, increased battery internal resistance until the circuit, the battery is no longer up to ensure that the battery temperature is normal.
And deep-filling can take to enhance the practical lithium-ion battery capacity? Experts clearly told me that this is meaningless. They even said that the so-called pre-release of three all-sufficient “activation”, in their knowledge of the two, Dr. Lane, is also not convinced that what is necessary. Why do so many people, however deep-rechargeable Battery Information released in the future will be marked changes in this capacity? Behind will be mentioned.
Li-ion laptop batteries are generally with the management of chip and charge control chips. Management chip which has a series of registers, there is capacity, temperature, ID, state-of-charge, discharge frequency values. These values are in use will gradually change. I personally believe that the use of notebook computers in the description of “the use of one month after the full charge should take a” major role in the practice should be amended is inappropriate in these register values, making the battery charge control and battery with a nominal capacity of the actual situation.
The main charge control chips to control the battery charging process. Rechargeable lithium-ion battery process is divided into two phases, fast charge constant current phase (when the battery indicator light yellow) and the descending phase of constant current (the battery indicator light flashes green. Constant current fast charge phase, the battery voltage gradually increased to the standard battery voltage, and then transferred to the next chip in the control of constant phase, higher voltage is no longer than necessary and sufficient to ensure that no current will rise as the battery gradually weakened to 0, and the final charge.
Statistics chip power consumption records through the discharge curve (voltage, current, time) can calculate the sample battery power, this is what we read in the Battery Information in wh. Value. The lithium-ion batteries used in many occasions, the discharge curve may change, if the chip has not been the opportunity to once again read out a complete discharge curve, its power consumption calculated is not accurate. Therefore, we need to put the deep filling of the chip to calibrate the battery.
Finally, I battery maintenance view is:
1. No need to deliberately ensure that every time a re-release END electric charge;
2. A period of time can be under the control of a protection circuit for deep-rechargeable battery release power to amend the statistics, but it does not increase the actual capacity of your battery.
3. The long-term without the batteries, should be placed on a cool place to weaken its own passive response to its internal speed.
4. The protection circuit is also able to monitor the battery self-discharge, long-term without the battery, should allow a certain degree of power into the battery to prevent self-discharge in storage in the discharge of excessive lead to excessive damage.
In fact, there is no battery to take into account the use of too much attention, in other words is taken into account and has little use. A battery to use the number of times, perhaps more from differences in the manufacture of the battery itself, the individual differences, rather than use. Choice of word-of-mouth has a good brand of notebook computers is the future use of long-life battery, one of the security.
