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release time:2023-08-12
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(1) Reduced amount of recyclable lithium;
(2) The deposited metal lithium reacts with solvents or supporting electrolytes to form Li2CO3, LiF, or other biological products;
(3) Lithium metal often forms between the negative electrode and the separator, which may block the gap in the separator and increase the internal resistance of the battery. When the proportion of positive active substance to negative active substance is too low, it is easy to cause overcharging of the positive electrode. The overcharging of the positive electrode mainly results in the formation of inert substances, causing oxygen loss and resulting in a decrease in battery capacity. Overdischarge can also cause damage to the lattice of the electrode plate, and if overcharging causes "reverse polarity", it can cause danger.
In order to provide a relatively high voltage to the electric vehicle motor, dozens of individual cells (cells) are generally used in series to provide power (the experimental sample vehicle involved in this article is equipped with 108 individual lithium-ion batteries with a working voltage of 3.8V). The complexity of using in series, as well as the inconsistency between batteries, pose higher requirements for management systems.
Compared with other batteries, the discharge current of lithium-ion power batteries is lower in terms of discharge rate and specific power. A good long-term battery can discharge at 1C and pulse at 2C. It is necessary to consider increasing the battery capacity to meet the requirements of electric vehicles.
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