What happen to the temperature of an electric battery when the battery is discharging?
So when charging it actually sucks heat from its surroundings and stays cool (until it is full and the reaction finishes), while during discharge it produces heat and gets hotter than you might expect. NiMH batteries do the opposite – they get hot while charging, but cool themselves during discharge.
Why does battery temperature increase?
As the temperature of the battery increases the chemical reactions inside the battery also quicken. At higher temperatures one of the effects on lithium-ion batteries’ is greater performance and increased storage capacity of the battery.
How does temperature and discharge rate affect battery capacity?
The rate at which a battery is discharged and its operating temperature have a profound effect on its capacity and life. An example of the effect of discharge rate on battery capacity is shown in Figure A for traction batteries.
How is battery temperature used to determine full charge?
The charge termination methods used by the LTC4010 and LTC4011 utilize battery voltage and battery temperature changes to reliably indicate when full charge is reached as a function of the charge current selected.
Why does temperature rise in lithium chemistry batteries?
As larger lithium-chemistry batteries are designed, managing the waste heat generated by the ever-higher charge and discharge currents becomes an increasing challenge. Excessive temperature rise in lithium-chemistry cell packs has always been a major design issue.
What happens when the temperature of a battery gets too high?
In the worst case, if cell temperatures get too high, venting may occur, resulting in battery failure or even a cell fire. New lithium battery chemistries like lithium iron phosphate (LiFePO4) promise to increase both charge and discharge max temperatures, but there will always be a fairly low upper limit.