June 11, 2010 -
PRLog -- Laptop battery problems have asked to see the people! ! Now express opinion! ! We want to help! ! First introduced to the principle! ! Lithium-ion battery cathode material of lithium in the active compounds are usually formed, the negative is a special molecular structure of carbon. Common cathode material mainly composed of licoo2, charging, plus the battery cathode polarization of the electric potential to force release of lithium-ion compounds, embedded negative elements arranged in lamellar structure of carbon. Discharge, the lithium-ion from the lamellar structure of the carbon in precipitation, and positive re-combination of compounds. Lithium-ion mobile rise to a current. Although the chemical reaction principle is very simple, but in the actual industrial production, the practical problems need to be considered much more: cathode material additives required to maintain the activity of several charge and discharge, anode material required to design the molecular structure level accommodate more lithium-ion;
fill in the electrolyte between the positive and negative, in addition to stability, but also has good electrical conductivity and reduce the battery internal resistance. Although the lithium-ion batteries are nickel-cadmium batteries few memory effect, memory effect is the principle of crystallization in lithium battery will not produce such a reaction, almost. However, lithium-ion battery capacity after repeated charge and discharge will continue to decline, its causes are complex and diverse. Mainly positive and negative changes in the material itself, from the molecular level, the positive and negative electrodes of lithium ion on the hole to accommodate the structure will gradually collapse, blocking; from a chemical point of view, is the anode and cathode materials Huoxing passivation, there's the other side to form a stable compounds. Cathode material physics will appear gradually falling off, etc. In short, can ultimately reduce the battery charge and discharge process of free movement in the lithium-ion number. Over-charging and over-discharge, lithium-ion batteries will cause permanent damage to positive and negative, from the molecular level, intuitive understanding, excessive discharge of carbon anode will lead to excessive release of lithium ion and makes it appear lamellar structure collapsed, over- will charge too much into the negative electrode of lithium ion hard carbon structure to go, and make some lithium-ion can no longer be released. This is also why the lithium-ion batteries are usually equipped with charge-discharge control circuit reasons. Not suitable for the temperature, will lead to an internal lithium-ion batteries produce other chemical reactions of compounds that we do not want to see, so many of the lithium ion battery between the positive and negative temperature with protective membrane or electrolyte additives. The battery temperature to a certain situation, composite membrane electrolyte membrane hole closed or degeneration, increased battery internal resistance until the circuit, the battery will not heat up, to ensure the battery temperature is normal. The deep charge and discharge can improve the practical capacity of lithium-ion batteries it? Experts clearly told me that this is meaningless. They even said that the so-called three full charge up before using the "activation"
in their knowledge of where the two doctors, also need to figure out what this. But why so many people of deep charge and discharge capacity after the battery information will change in labeling it? Will be mentioned later. Notebook computer lithium-ion batteries are generally charged with the management of chip and controller chip. Management chip which has a series of registers, there is capacity, temperature, id, charge status, discharge frequency values. These values are in use will gradually change. Personally, I think, in notebook computers for use in the "use of one month after the full charge should put a" major role in the practice should be an amendment to the register where the value of improperly, making the battery charge control and consistent with a nominal capacity of the battery the actual situation. Main control chip, battery charge control the charging process. Lithium-ion battery charging process is divided into two phases, constant current fast charge phase (when the battery indicator light yellow) and reduced voltage current phase (the battery indicator light flashes green. Constant current fast charge phase, the battery voltage is gradually increased to the standard battery voltage, then under the control chip into the constant pressure phase, the voltage will not rise to ensure that no over charge and current as the battery level gradually decreased up to 0, and the ultimate completion of charge. Statistics chip power consumption by recording discharge curve (voltage, current, time) can calculate the sample battery power, this is what we read in the battery information in wh.. for lithium ion batteries used in many occasions, the discharge curve may change, If the chip has been no opportunity to once again read out a complete discharge curve, the calculated power is not accurate. so we need to calibrate the battery charge and discharge of deep chips.
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