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What is the damage to the battery caused by overcharge and overdischarge?

2019-3-19

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  Overcharge

  The so-called overcharge,as the name suggests,is overcharged,that is,after the battery is fully charged,continue to charge it.

  After charging fully,the battery will continue to be charged to a certain extent.The gas generated by the decomposition of the electrolyte in the lithium ion battery will cause the battery to expand and even smoke.In this way,the battery will not work properly.Just like a balloon,after filling with gas,it will continue to charge,and the balloon will burst sooner or later.

  Some customers,in order to suit the aesthetics of their products,or in order to meet the product mold design requirements,often only buy batteries,and design their own protection board,which is also easy to cause overcharge.On the one hand,because their battery professional level is not high,the experimental equipment is backward,the overcharge protection parameters of the design are different;on the other hand,because the quality of the batteries produced by different battery manufacturers is different,the lithium materials used are different.They can't judge,always use the same process to design overcharge protection parameters,which is also prone to errors,resulting in overcharge.

  Of course,if you charge it once or twice,the damage to the battery is not great,and the user experience is not deep,but the time is long,the number of overcharges is too much,and the battery will change due to the amount of change,until it can not be charged,it can not be released.The results can be imagined.

  Over discharge

  The so-called over-discharge refers to the amount of electricity stored in the battery after the battery is discharged.After the voltage drops to a certain value,it continues to discharge,causing over-discharge.Generally,the discharge cutoff voltage is determined according to the discharge current,that is,the threshold voltage value for judging whether or not the discharge is performed.For a 3.7V lithium battery,the 0.2C-2C discharge is generally set to 3.0V,and the discharge of 3C or more,such as 5C or 10C.For discharge,set to 2.4V.

  Over-discharge of the battery often causes catastrophic consequences for the battery,especially high-current over-discharge,or repeated over-discharge,which has a greater impact on the battery's electrical performance.This is like a person,a blood loss of three or five hundred milliliters,will not affect the health of people,but once the blood loss is too much,the normal physical function of the person can not be maintained,to a certain extent,people will die.In the case of batteries,over-discharge will increase the internal pressure of the battery,and the reversible function of the positive and negative active materials will be destroyed.Even if it is remedied by charging,it is difficult to fully recover.Naturally,the capacity is obviously attenuated and attenuated to a certain extent.Death,there is no way to return to life.

  In order to avoid excessively causing the consequences,we should set the pre-protection parameters according to the characteristics of the battery itself.For the later use,we should strictly follow the battery"use regulations"in accordance with the instruction manual,and the quality and quantity are guaranteed.Execution.It is best to leave"remaining power"to the battery.Just as"doing a thing to stay in the line and seeing it in the future",it is like doing a"basic"for recharging,just like doing things,starting from"zero"is difficult.We have been emphasizing that the rechargeable battery is a science of application.It is especially important to use.It will be used well.It will listen to you and serve you with your loyalty and service,especially for the extremely active lithium-ion battery.You should be careful to serve,otherwise,it will abandon you to a hard horse that is difficult to tame,so that you can not laugh.