Low-temperature self-heating method of lithium ion battery pack
A lithium-ion battery pack and self-heating technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of low heating efficiency of the battery pack, difficulty in heating the battery pack, and high cost, and achieve shortened self-heating time, heating The effect of good temperature uniformity and fast self-heating rate
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[0061] The following specific embodiments take a ternary-lithium manganate hybrid power battery as an example for description.
[0062] During the charging and discharging process of the battery, the battery has a polarization voltage. The polarization voltage is used to describe the physical and chemical processes in the battery. It is caused by the restriction of the transportation of substances in the electrolyte and the solid phase of the electrode material, the contact obstacles between the solid phases, and the Caused by a delayed electrochemical reaction. The battery impedance increases significantly at low temperatures, such as figure 1 It is the EIS diagram of 35Ah ternary-lithium manganate hybrid lithium-ion power battery under different aging conditions at -20℃, by figure 1 It can be seen that there is no obvious relationship between battery impedance and battery aging. figure 2 It is the EIS diagram of 35Ah ternary-lithium manganate hybrid material lithium-ion power b...
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