Lithium ion battery pack charge heating system and heating method

Abstract

The invention discloses a lithium ion battery pack charge heating system and a lithium ion battery pack charge heating method, which are provided aiming at the problem of low-temperature heating of a lithium ion battery pack. According to the method, a heating mode adopted during the low-temperature charging of the lithium ion battery pack is that the interior and the exterior of a battery pack are simultaneously heated through discharge of the battery pack and simultaneous work of an external heating device, so that the heating efficiency is high and the heating time is short. The SOC (State of Charge) lost due to discharge is replenished through work of a charge loop; and data such as charge and discharge time, charge and discharge current, temperature and SOC in an entire process are acquired, monitored, processed and the like by a battery management system.

Description

Technical field: [0001] The invention relates to the field of lithium-ion batteries, in particular to a low-temperature charging heating system and heating method for a lithium-ion battery pack. Background technique: [0002] When lithium-ion batteries are charged at low temperatures, lithium ions are prone to dendrites on the negative electrode. As the dendrites grow, they will pierce the diaphragm between the positive and negative electrodes of the battery and form a short circuit, causing great danger. At present, most of the heating methods for lithium-ion batteries are external heating, so that the battery is heated unevenly, and lithium precipitation will still occur. Invention content: [0003] In order to solve the above-mentioned problems existing in the prior art, the object of the present invention is to propose a charging and heating system for a lithium-ion battery pack, which system includes a charging circuit, a discharging circuit, a battery pack, a dischar...

AI Technical Summary

Problems solved by technology

[0002] When lithium-ion batteries are charged at low temperature, dendrites are prone to appear on the negative electrode of lithium ions. As the dendrites grow, they will pierce the diaphragm between the positive and negative electrodes of the battery and form a short circuit, causing great danger.

At present, most of the heating methods for lithium-ion batteries are external heating, so that the battery is not heated evenly, and lithium precipitation will still occur.

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