On the Thinkpad laptop computer batteries and maintenance of (b)
On the Thinkpad laptop computer batteries and maintenance of (b)
Over-charging and over-discharge, lithium batteries will be positive laptop battery and negative result in permanent damage, from the molecular level, intuitive understanding, over-discharge of carbon anode will lead to excessive release of lithium ion and makes it appear lamellar structure collapsed, over-charging will too hard into the negative electrode of lithium-ion go carbon structure, causing some of the lithium-ion can no longer be released. This is why Li-ion batteries are usually equipped with charge-discharge control circuit causes.
Not suitable for the temperature, will lead to other chemicals in the internal lithium battery that we do not want to see the reaction of the compounds, so in some lithium between the positive and negative electrodes with a protective membrane or electrolyte additives, temperature control. In the battery temperature reached a certain circumstances, the composite membrane electrolyte IBM 02K6928 Battery membrane hole closed or degeneration, increased battery internal resistance until the circuit, the battery is no longer to heat up, to ensure that the battery charging temperature is normal.
And deep charge-discharge of lithium batteries improve the actual capacity, experts clearly tell me that this is meaningless. They even said that the so-called three full charge-discharge prior to use of "activation" in their knowledge of the two Phd years, could not understand this as a need. Why do so many people, however, after the deep charge-discharge capacity of Battery Information label will occur where a change? Will be mentioned later.
IBM laptop with a lithium-ion battery IBM ThinkPad R32 Battery management chip and charge control chips. Which management chip in a series of registers, there is capacity, temperature, ID, charge status, discharge frequency values. These values are a gradual change in use, said that some value in a number of non-full-full which may lead to decline in the battery nominal capacity, the battery charge time, dissatisfaction, or the use of shorter and so on.
I personally think that the use of IBM instructions in a month should be full charge-discharge a major role in the practice now is to fix these registers where the wrong values, making the battery charge control and the nominal capacity of the battery match the actual situation. If people are way to directly read out these values, combined with recharge to analyze the situation, I would like the protection of the circuit is not difficult to crack under the control of deep charge-discharge of the battery IBM ThinkPad R40 Battery indicator has improved the real reason.
Charge control the main control chip, the battery charging process. ThinkPad Li-ion battery charging process is divided into two phases, constant-current fast charge phase (when the battery indicator light yellow) and constant-voltage current decreasing phase (the battery indicator light flashes green. Heng flow fast-charge stage, the battery voltage gradually rises to the battery's nominal voltage, and subsequently transferred under constant pressure phase control chip, the voltage will not rise in order to ensure that no over-charge, current battery, along with the gradual weakening of the increase in to 0, and the ultimate completion of charging.
Statistics chip power consumption by recording the discharge curve (voltage, current, time) can calculate the sample battery power, this is what we read in the Battery IBM 92P1075 Battery Information inside wh. While the use of lithium in the many after-discharge curve will change, if the Chip has not been opportunity to once again read out a complete discharge curve, which is calculated out of electricity that is not accurate. So we need to deep charge-discharge to calibrate the battery chips.
Finally, I right battery maintenance view is:
1. No need to ensure that every time a re-release END electric charge;
2. A period of time to do a protection circuit placed under the control of deep-charge battery IBM 08K8197 Battery power to amend the statistics, but it will not improve your battery's actual capacity.
3. A long time without the battery, should be placed in the shade in order to weaken its internal self-passivation reaction speed.
4. Protection circuit is also able to monitor the battery self-discharge, long-term without the battery should be charging to a certain degree of power to prevent self-discharge of batteries in storage in the discharge of excessive lead to excessive damage;
In fact, there is not much to take into account the battery use of attention, in other words is taken into account is not much use. The number of times a cell can use, and perhaps more from the battery itself, differences in the manufacture of individual IBM 08K8198 Battery differences, rather than use.
