A battery-based low temperature compensation method and device

Abstract

The invention discloses low-temperature compensation method and device based on a battery. The method includes the steps that the surface temperature value of the battery is acquired; whether the surface temperature value of the battery is lower than a first temperature threshold value or not is judged; if the surface temperature value of the battery is lower than the first temperature threshold value, a switching circuit controls a valve arranged on a spontaneous heating module to be switched on, air enters the spontaneous heating module, makes contact with a spontaneous heating material in the spontaneous heating module, and then release heat to heat the battery. In this way, the battery can be heated in the extreme low-temperature environment, and therefore the battery can be normally charged and discharged in the extreme low-temperature environment.

Description

technical field [0001] The present invention relates to the field of batteries, in particular to a method and device for low temperature compensation based on batteries. Background technique [0002] Lithium-ion batteries used in mobile terminals are composed of positive electrodes, negative electrodes, and electrolytes. Among them, when the lithium ion battery is working, the lithium ion uses the electrolyte as a carrier to move between the positive and negative electrodes to realize the charging and discharging of the battery. When the temperature is very low, the migration rate of lithium ions will slow down, which will lead to a large amount of lithium deposition in the lithium ion battery during charging and a large loss of discharge capacity of the lithium ion battery during discharge, which greatly affects the use of lithium ion batteries by users, and then It greatly affects the use of mobile terminals by users. For example, at -20°C, the discharge capacity of lith...

AI Technical Summary

Problems solved by technology

When the temperature is very low, the migration rate of lithium ions will slow down, resulting in a large amount of lithium ion battery during charging and a large loss of discharge capacity of lithium ion batteries during discharge, which greatly affects the use of lithium ion batteries by users. Greatly affect the use of mobile terminals by users

For example, at -20°C, the discharge capacity of lithium-ion batteries decays greatly, and a fully charged battery can only discharge less than 5% of its electricity.

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