리튬 이온 배터리의 충전 온도-0℃에 어떤 영향을 미칩니까? Posted by batterymanufactory.com
Li-ion battery charging in low temperature environment has certain risks. Because with the decrease of temperature, the dynamic characteristics of graphite anode become worse and worse. During the charging process, the electrochemical polarization of the anode is significantly intensified. The precipitated metal lithium is easy to form lithium dendrites, break through the diaphragm and cause the positive and negative pole short circuit. Try to prevent lithium ion batteries from charging at low temperature.
Because
of the low temperature, the lithium ion battery nested on the negative
electrode will appear ionic crystals, which will directly pierce the
diaphragm. Generally, it will cause micro-circuit, which will affect the
life and performance, and may explode seriously!
According to the research of experts, the use of lithium-ion batteries in low temperature environment
for a short time, or when the temperature is not low enough, will only
temporarily affect the battery capacity of lithium-ion batteries, but
will not cause permanent damage. However, if it is used in a
low-temperature environment for a long time, or in an ultra-low
temperature environment of - 40 ℃, the lithium-ion battery may be frozen
and cause permanent damage.
Lithium
ion batteries used at low temperature have problems such as low
capacity, serious attenuation, poor cycle rate performance, obvious
lithium precipitation and imbalance of lithium removal and insertion.
However, with the continuous expansion of application fields, the low
temperature performance of lithium-ion batteries has become more and
more obvious. In the fields of special aerospace, special and electric
vehicles, the battery is required to work normally at - 40 ℃. Therefore,
it is of great significance to improve the low-temperature properties
of lithium ion batteries.
As
for lithium-ion battery, there is no clear theory to support its
internal resistance, discharge platform, life, capacity and other
inevitable relations under various temperature performance in the
industry at present, and the relevant calculation formula and
mathematical model are still in the exploratory stage. In general,
lithium-ion batteries are not sensitive to temperatures in the range of
0-40 ℃. However, once the temperature exceeds this range, life and
capacity will be reduced.
The low temperature performance of lithium-ion batteries made of different materials is also different. Now the hottest lithium iron phosphate
is the worst at low temperature. Our products have a capacity of 89% of
the maximum capacity at - 10 ℃, which should be relatively high in the
industry; The discharge capacity can reach 95% at 55 ℃, and the
attenuation of relatively low temperature is relatively small.
Recharging
lithium ion battery at low temperature will precipitate metal lithium
on the anode surface of the battery, and this process is irreversible.
This will cause permanent damage to the battery and reduce the safety of
the lithium-ion battery.
batterymanufactory.com
BENZO 에너지 과학 기술 유한 회사
UFine Technology Co.,Ltd
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