Battery Consistency Impact For Batteries
Battery consistency refers to the degree of uniformity in voltage,capacity,internal resistance,charge and discharge characteristics of each battery cell in a battery pack,it has multiple impacts on batteries,including following:
1.The impact on battery performance
Charge and discharge efficiency:A battery pack with good consistency allows each cell to charge and discharge synchronously,resulting in high energy transfer efficiency between the charger and the battery,opposite,due to the different charging acceptance ability and discharge depth of each individual cell,can lead to longer charging time, premature depletion of some batteries during discharge,and affect the overall charging and discharging efficiency.
Output power:The output power of a battery pack depends on the worst performing cell,good consistency allows each individual cell to work together and output stable power,opposite,the performance will be limited by the battery with poor performance,unable to fully exert its output power,resulting in a decrease in the overall output power of the battery pack.
2.The impact on battery life
Cycle life:During the charging and discharging process,in battery packs with poor consistency,the charging and discharging depth and voltage changes of each individual cell are inconsistent,which can lead to overcharging or overdischarging of some cells,accelerate battery aging and damage,and shorten the cycle life of the battery pack,opposite it has a relatively balanced working state of each individual cell,which can effectively reduce irreversible damage to the battery and extend its cycle life.
Calendar life:Even if the battery is in a static state, the self discharge rate of each individual cell in a battery pack with poor consistency is different,which can lead to voltage differences inside the battery pack, thereby exacerbating chemical side reactions inside the battery and shortening its calendar life.
3.The impact on battery safety
Thermal stability:During the charging and discharging process with poor consistency,the heating situation of each individual cell is different,which may lead to local overheating and affect the thermal stability of the battery pack,when heat accumulates to a certain extent,it may cause thermal runaway,posing safety hazards such as fire and explosion,a battery pack with good consistency has uniform heating and relatively uniform heat dissipation among individual cells,good thermal stability,and higher safety.
Risk of overcharging and overdischarging:Due to the inconsistent voltage,capacity,and other parameters of individual batteries in a battery pack with poor consistency,some batteries may be fully charged while others are not,continuing to charge may result in overcharging of fully charged batteries;during discharge,it is possible that some batteries have already been fully discharged while other batteries still have remaining charge,resulting in overdischarging of the fully discharged batteries,both overcharging and overdischarging can cause serious damage to the battery and even lead to safety accidents.