Factors affecting the health of no 5 alkaline battery.
In recent years, various countries around the world have carried out a lot
of scientific research on the embrittlement mechanism and regularity of no 5
alkaline battery. It is widely believed that the accumulation of lithium ion
batteries, the increase in SEI film thickness and the damage of active materials
are responsible for the embrittlement and volume attenuation coefficient of
rechargeable batteries. The main reason. The misuse of no 5 alkaline battery
will accelerate the aging of the battery, and normal charging and discharging
will also affect the health of the battery and accelerate the aging of the
battery.
1. The harm of temperature to the SOH value of rechargeable batteries.
It is generally believed that temperature is an important factor affecting
the health of the battery. Temperature has a two-way impact on battery
performance. On the one hand, high temperature will accelerate the chemical
changes inside the battery and improve the efficiency and performance of the
battery. On the other hand, high temperature will cause some irreversible
damage. Chemical changes occur, resulting in the reduction of active materials
in the rechargeable battery, resulting in embrittlement and volume attenuation
coefficient of the rechargeable battery. Scientific research shows that high
temperatures will accelerate the growth of the battery level SEI film, increase
the difficulty of lithium-ion batteries passing through the SEI film, and
increase the internal resistance of the battery.
2. The harm of charging and discharging current rate to SOH components.
A 300-cycle test of three different charge-discharge ratios was carried out
using Sony 18650 rechargeable battery. The results showed: battery power
attenuation coefficient, battery power reduction, battery internal resistance
increase, battery internal resistance increase, battery internal resistance
increase, battery internal resistance increase, battery internal resistance
increase, battery internal resistance increase, battery internal resistance
increase, battery internal resistance increase, battery internal resistance
increase, battery internal resistance increase The resistance increases; in
addition, the charging and discharging of polymer cells will generate a large
amount of heat inside the battery, accelerating the aging of the battery.
According to transmission electron microscopy observations, it is found that the
SEI film on the surface of polymer battery cells has a lower charge and
discharge level. Multiple charge and discharge film thickness.
3. The harm of deep discharge to the SOH value of rechargeable
batteries.
Battery charging is closely related to the health and aging of the battery.
Some people believe that the battery has accumulated total transfer energy, and
the volume attenuation coefficient and aging of the battery are analyzed based
on the total transfer energy. Through cyclic experiments on no 5 alkaline
battery at different charging and discharging depths, Fei Xiang et al. analyzed
the relationship between the accumulated migration energy of the battery and the
battery capacity attenuation coefficient, and found that before the battery
capacity attenuation coefficient reached 85%, the battery was charged deeply,
discharged deeply, and discharged shallowly. The accumulated transfer energy
under the two methods is basically the same. When the battery capacity
attenuation coefficient reaches 85%~75%, the accumulated transfer energy and
energy efficiency of the battery under the deep charge and deep discharge method
are both better than the shallow discharge method.
4. The impact of circulation system spacing on the SOH concentration value
of rechargeable batteries.
The cycle interval between charging and discharging a lithium battery pack
will also affect the aging process of the battery. Different cycle intervals
match different internal resistances of the batteries, so the battery heats up
and reacts slightly differently during the cycle. , long-term operation will
affect the health and aging of the battery. Experts believe that the SOC range
of batteries is 20% to 80%, which is beneficial to the health and circulatory
life of batteries.
5. The harm of battery charging cut-off voltage to SOH value;
Overcharging and losing power of the lithium battery pack will affect the
health of the battery, and poor voltage and low voltage limits will also affect
the health of the lithium battery pack. As the charging and discharging voltage
decreases, the internal resistance of the battery increases, causing the battery
to become hot inside. At the same time, side effects increase, the battery
active material decreases, the negative grade high-purity graphite flakes
collapse, the battery accelerates aging, and the attenuation capacity increases.
If the battery charging cut-off voltage is too high, the internal resistance of
the battery will increase, and the internal heat of the battery will increase.
Overcharging the battery will cause the negative stage to cause "lithium
precipitation", which will lead to increased adverse reactions, affecting
battery power and aging.
All in all, battery operating temperature, battery charging rate, charge
and discharge depth, cycle time interval, battery charging cut-off voltage, etc.
will affect the health and service life of the battery. The scientific research
on factors affecting battery health is still in the stage of qualitative
analysis. This qualitative analysis of influencing factors and the coupling
relationship between each factor is a difficult problem for scientific research,
and it will also be a hot spot for future scientific research on battery health
and service life. .
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