Author ：Iflowpower – Portable Power Station Supplier
If the lithium-ion battery is presuppostable, the charging will continue to charge in the case where the battery is full, resulting in a variation of the positive material material, which causes capacity loss, and its disconnection oxygen and electrolyte will have severe chemical reactions, the worst result is naturally happening. explode. After the lithium ion battery is put on the amount of internal storage, the voltage reaches a certain value, which will continue to discharge, usually determine the discharge cutout voltage according to the discharge current.
0.2C-2C discharge is typically set 1.0V / branch, 3C or more, and the discharge of 5C or 10C is set to 0.
8V / branch, battery excess may bring catastrophic consequences to the battery, especially large current over, or Repeated overlapping the battery effect is greater. In general, the over-discharge will increase the pressure of the lithium ion battery, and the positive and negative active substance is reversible, even if charging can only be partially recovered, the capacity will also be significantly attenuated. The lithium-ion battery is deeply placed, the greater the loss of the battery, the more ideal state of the lithium-ion battery work is shallow and shallow, the longer the battery life is.
Why is the lithium ion battery extends or overlaps if the gas occurs? Ordinary lithium ion batteries will have a small amount of gas inside the battery during the charging process, generally absorbed during discharge. The charging current is too large, often overcharge will exacerbate the occurrence of gas, so that the increase in the internal pressure of lithium-ion batteries causes a bulging phenomenon. The battery is slightly burden is allowed to prevent overcharge is the key to reducing bulging phenomena.
In addition, the chemical properties of lithium are very active, it is easy to combust, when the lithium ion battery charges and discharge, the internal temperature of the battery continues to heat up, the gas expansion in the activation process, the internal pressure of the battery is increased, and the pressure can be broken, causing Leakage, fire, or even explosion, it is absolutely important to ensure its safety performance. Lithium-ion battery overcharge control method In order to prevent lithium ion battery prevention, the charging endpoint is controlled. When the battery is full, there will be some special information available to determine whether the charging reaches the end point.
There are generally the following six ways to prevent the battery from being overchaled: 1. Peak voltage control: Judgment the end of charging by detecting the peak voltage of the battery; 2. DT / DT control: Judgment the end of charging by detecting the peak temperature change rate of the battery ; 3.
T control: The difference between the temperature and the ambient temperature of the battery will reach the maximum; 4.-V Control: After the battery is fully charged to a peak voltage, the voltage will drop a certain value; 5. Timing control: By setting A certain charging time controls the charging end point, generally set the time required to charge 130% nominal capacity to control; 6.
TCO control: Considering the safety and characteristics of lithium ion batteries should prevent high temperature (except high temperature battery), Therefore, when the battery temperature is increased by 60, the charging should be stopped. What is the advantage of lithium-ion batteries? High energy density lithium battery strength high working voltage has no memory effect circulating life, no pollution weight, self-discharge small summary: lithium ion battery overtake, over-discharge will affect battery life. Pay attention to the charging voltage of lithium ion batteries, charging current.
Then select the appropriate charging chip to charge the lithium-ion battery correctly to prevent shortened life.
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