Battery charging control device and battery charging control method

Abstract

The invention discloses a battery charging control device and a battery charging control method. The battery charging control device comprises a wireless charging module, a load circuit module, a main control module and a temperature monitoring module, a load circuit module comprises a preheating circuit and a charging circuit, when a battery is pre-charged, a main control module receives first temperature information monitored by a temperature monitoring module, and controls a wireless charging module to output different working powers to the load circuit module according to the first temperature information and preset temperature information; the preheating circuit is controlled to be electrically connected with the battery, so that the battery works in a preheating stage; the control circuit is electrically connected with the battery, so that the battery works in a charging stage; and the preheating circuit is arranged, heat is generated through the chemical reaction of charging and discharging of the lithium battery, meanwhile, the lithium precipitation phenomenon caused by accumulation of excessive lithium ions at the negative electrode of the battery is avoided, and the effects of battery protection and safe charging are achieved.

Description

technical field [0001] The invention relates to the technical field of charging, in particular to a battery charging control device and a battery charging control method. Background technique [0002] Conventional lithium batteries are forbidden to be charged at low temperatures, especially below zero temperature. Since the viscosity of the electrolyte of lithium batteries increases below 0°C, the conductivity decreases, and the dynamic characteristics of the graphite negative electrode gradually deteriorate. Therefore, during low temperature charging, lithium The ions cannot be embedded in the graphite of the negative electrode in time, so they accumulate on the surface of the negative electrode to precipitate metal lithium. The precipitated metal lithium may further develop and eventually become lithium dendrites, which break through the separator and cause a short circuit between the positive and negative electrodes. Therefore, low temperature, especially zero temperature...

AI Technical Summary

Problems solved by technology

[0002] Conventional lithium batteries are forbidden to be charged at low temperatures, especially below zero temperature. Since the viscosity of the electrolyte of lithium batteries increases below 0°C, the electrical conductivity decreases, and the dynamic characteristics of graphite negative electrodes gradually deteriorate. Therefore, during low temperature charging, lithium The ions cannot be embedded in the graphite of the negative electrode in time and accumulate on the surface of the negative electrode to precipitate metal lithium. The precipitated metal lithium may further develop and eventually become lithium dendrites, which break through the separator and cause a short circuit between the positive and negative electrodes.

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