Cylindrical lithium ion battery with thermal management function

Abstract

The invention relates to the technical field of lithium ion battery thermal management, in particular to a cylindrical lithium ion battery with a thermal management function. The battery mainly comprises a shell, a battery cell, a heat-conducting insulating column, heat-conducting insulating sealing blocks, a phase-change material and an electric heating wire. The battery cell is wrapped by the shell. The shell is of a hollow structure, and the heat-conducting insulating column is located in the center of the shell. The heat-conducting insulating column is connected with the shell through theheat-conducting insulating sealing blocks at the two ends. The phase-change material is filled between the shell and the heat conduction insulating column. The electric heating wire is wound on the surface of the heat-conducting insulating column. According to the battery provided by the invention, the phase-change material is matched with the heat-conducting insulating sealing blocks and the heat-conducting insulating column during high-rate charging and discharging, so the highest temperature of the battery can be effectively reduced, and the temperature uniformity is improved; at a low temperature below zero DEG C, the battery cell can quickly reach a safe charging and discharging temperature by electrically heating the electric heating wire for a short time, and the temperature can bemaintained for a period of time by virtue of the heat preservation effect of the phase-change material.

Description

technical field [0001] The patent of the present invention relates to the technical field of thermal management of lithium-ion batteries, in particular to a cylindrical lithium-ion battery with thermal management function. Background technique [0002] Lithium-ion batteries have been widely used in various fields due to their excellent charge and discharge performance. Among them, the cylindrical lithium-ion battery is one of the battery types selected for power batteries in the automotive field. Temperature has a great influence on the performance and safety of the battery, so the thermal management of the battery is particularly important. At present, the main methods of battery thermal management include air cooling, liquid cooling, phase change material cooling, and heat pipe cooling. The liquid cooling system is widely used in actual vehicles. For example, the Tesla car arranges cooling channels outside the cylindrical battery, and the coolant flows inside. The main p...

AI Technical Summary

Problems solved by technology

The liquid cooling system is widely used in actual vehicles. For example, the Tesla car arranges cooling channels outside the cylindrical battery, and the coolant flows inside. The main problems are the risk of leakage and high energy consumption. In addition to cooling the battery to prevent it from overheating, when the ambient temperature is too low to affect the battery's operation, the liquid cooling system can also heat the coolant and then transfer the heat to the battery to restore it to the operating temperature, but it usually takes a long time and once Stop heating, the battery temperature will drop rapidly again soon

However, at present, most of them only use phase change materials to dissipate heat from batteries, and lack a battery structure that can fully combine the above two advantages of phase change materials to achieve both heat dissipation and heating.

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