Author ：Iflowpower – Portable Power Station Supplier
Lithium-ion battery high temperature effect, high temperature is the cause of lithium-ion battery drums? The lithium-ion battery has the advantages of high operating voltage, low-discipline, no memory effect, no pollution, is optimistic about the lithium iron phosphate ion battery in the new energy industry, widely used in the field of power lithium batteries and energy storage. However, the speed of promotion and the application are wide, but the depth is not satisfactory, the factors that hinder their rapid promotion In addition to the price of batch consistency caused by the battery material, its temperature performance is also an important factor. Lithium-ion battery high temperature effects In all environmental factors, the temperature affects the charge and discharge performance of the battery, the electrochemical reaction on the electrode / electrolyte interface is related to the ambient temperature, and the temperature rise, the lithium ion battery output power will rise.
The temperature also affects the transmission speed of the electrolytic liquid, and the temperature rise is accelerated, the transfer temperature is lowered, the transmission is slow, and the battery charge and discharge performance will also be affected. However, the temperature is too high over 45 ¡ã C to destroy the chemical balance in the battery, resulting in side reactions. The effect of temperature on discharge performance directly reacts to discharge capacity and discharge voltage.
The temperature is lowered, the internal resistance is increased, the electrochemical reaction rate is slow, the polarization internal resistance is increased, the battery discharge capacity and the discharge platform are lowered, affect the output of battery power and energy. The lithium-ion battery capacity decline has the effect of battery polarization, that is, the lithium ion diffusion velocity is not in the transfer speed of electrons, so that the lithium ions accommodated by the battery are less and less. This polarization process further exacerbates at a high temperature of 60 ¡ã C, which is the root cause of lithium ion battery capacity attenuation.
The high temperature failure mechanism of lithium-ion batteries is far more complex in the predecessors, and it is difficult to distinguish between active lithium loss and loss of active materials in actual research. There is a lithium iron phosphate phase in which a lithium phosphate material is lithium phosphate is isolated from the electron conductive channel formed by the internal stress, so that the loss of remembering lithium cannot be reversible. High temperature is the cause of lithium-ion battery drums? 1 It is manifested as a cell bullet, so the battery is buns is also an early warning that the battery is damaged or may have security issues.
2, the battery is affected by high temperature, most of the time cells are stored for a long time, and the temperature will accelerate some chemical reactions in the battery cell to form a gas, especially if the battery is full or slightly overcharged. The effects of high temperature storage in this are more obvious, so it should be prevented from being stored in high temperatures. 3.
During this process, the lithium ions of the negative electrode are increasing, and the over-accumulation allows the lithium atom to be crystallized, so that the battery is bulging. 4, the SEI film will prevent the negative electrode material, so that the material structure is not easy to collapse, and the cycle life of the electrode material can be added. The SEI film is not a constant, there will be a little change during the charge and discharge process, it is important that some organic matter will reversible changes.
After the battery is excessively discharged, the SEI film occurs reversible to break the ring, and the SEI destruction of the negative electrode material makes the negative electrode material collapse, thereby forming a bulk phenomenon. The chemistry and electrochemical reaction of lithium-ion batteries at high temperatures are very complicated, studying the reactive mechanism between the internal composition of the battery, and improving the occurrence of various types of exothermic reactions, improving the safety performance under battery abuse is critical. Lithium-ion batteries are affected by temperature, in terms of application environments in the field and temperature of the power lithium battery, to improve the battery efficiency, extend battery system service life.
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