Laptop battery structure and reasonable charge and discharge
Posted by admin on February 18th, 2013Laptop battery structure and reasonable charge and discharge
The lithium-ion battery cathode materials are usually composed of the active compounds of lithium, the negative electrode is a special molecular structure of the carbon. The main component of the common cathode material LiCoO2, charging, added to the poles of the laptop battery potential forcing positive compounds release of lithium ions, embedded negative elements arranged in a lamellar structure of carbon. Discharge, lithium ion from the lamellar structure of the carbon precipitation and re-cathode combination of compounds. The movement of the lithium ions produces a current.
Reactions lithium toshiba battery cathode materials are usually composed of the active compounds of lithium, the negative electrode is a special molecular structure of carbon. The main component of the common cathode material LiCoO2, charging, added to the poles of the acer battery potential forcing positive compounds release of lithium ions, embedded negative elements arranged in a lamellar structure of carbon. Discharge, lithium ion from the lamellar structure of the carbon precipitation and re-cathode combination of compounds. The movement of the lithium ions produces a current. Should principle although very simple, in the actual industrial production, however, the need to consider the actual problem much more: a positive electrode material of additives required to maintain the activity of the repeated charge-discharge, the negative electrode material in the level of molecular structure to design in order to accommodate more lithium ions; filled in the electrolyte between the positive and negative electrodes, in addition to maintaining stability, but also needs to have a good electrical conductivity, reducing the sony laptop battery internal resistance.
Although the lithium ion apple battery is rarely have the memory effect of the nickel-cadmium batteries, the principles of the memory effect of the crystallization, this reaction is hardly generated in the lithium battery. the lithium-ion battery for lg
capacity after repeated charge-discharge will decline, its causes are complex and varied. Positive and negative changes, from the molecular level, the positive and negative on the capacity of the lithium-ion hole structure will gradually collapse, clogging; From the chemical point of view, is the active anode material passivation, Vice reaction stability other compounds. The physical will appear on the cathode material gradually peeling, in short, ultimately reducing the number of lithium-ion batteries can freely move in the process of charging and discharging.
Over-charge and over-discharge, cause permanent damage to the sony batteries will be positive and negative, from the molecular level, intuitive understanding, excessive discharge of carbon anode will lead to excessive release of lithium ions and making it appear lamellar structure collapse over-charging lithium-ion will too hard into negative carbon structure, and makes some of the lithium-ion no longer be released. This is also why the asus laptop batteries usually equipped with a control circuit causes the charging and discharging.
Not suitable temperature, will lead to other chemical reactions within the lithium-ion compaq battery to generate compounds that we do not want to see, so many of the lithium-ion battery is between the positive and negative features the protective thermostat diaphragm or electrolyte additives. Batteries for samsung heat up to a certain case, the composite membrane film hole closed or the electrolyte degeneration, increased battery internal resistance until the circuit, the battery is no longer warming, to ensure that the temperature of the dell battery charging normal. Deep charge-discharge can improve the actual capacity of the lithium-ion battery? Experts clearly told me, this makes no sense. They even said, “activate”, three times a full charge and discharge before the so-called use their knowledge of Dr. figure out what is necessary. However, why a lot of people deep charge-discharge Battery Information marked capacity will change it? Will be mentioned later.
Laptops use lenovo lithium-ion batteries are generally with management chip and charge control chips. Management chip, a series of registers, there is capacity, temperature, ID, charge status, discharge times and values. These values ??are in use will gradually change. Personally, I think that the main role should use a month later in the instructions for use of the laptop should fully charge and discharge practice is to fix these registers where improper value, making the battery of gateway charge control and a nominal capacity of the battery match actual situation. The charge control chips to control the battery charging process. The hp lithium-ion battery charging process is divided into two phases, constant current fast charge phase (the battery indicator light yellow) and voltage current phase (the battery indicator light flashes green. Constant current fast charge phase, the battery voltage is gradually increased The standard voltage to the battery, and then transferred to the constant voltage phase control chip, the voltage will not rise to ensure that you do not over-charge current as the battery level rise gradually weakened to 0, and the final charge.
Statistics chip power consumption by recording the discharge curve (voltage, current, time) can calculate the sample ibm battery power, this is that we read in the Battery Information wh. Values. The lithium-ion battery in repeated use, the discharge curve will change, if the chip has been no opportunity to once again read out a complete discharge curve, the calculated electricity that is not accurate. Therefore, we need deep charge and discharge to calibrate the battery chip.
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