A system and method for monitoring the temperature of a cylindrical lithium-ion battery

Abstract

The invention discloses a system and a method for monitoring the temperature of a cylindrical lithium ion battery, belonging to the field of lithium batteries. A system and method for monitoring the temperature of a cylindrical lithium-ion battery, including a lithium-ion battery body and a control module, a comparison module, a temperature detection module, a temperature control module, and an alarm module disposed in the lithium-ion battery body, the lithium-ion battery body includes The battery steel shell and the winding core fixed in the battery steel shell, the comparison module, the temperature detection module, the temperature control module and the alarm module are all connected to the control module signal, and the comparison module is used to compare the lithium-ion battery body displayed by the temperature detection module External and internal temperature difference information, the temperature detection module is used to detect the internal temperature and external temperature of the lithium-ion battery body, which can realize real-time monitoring and accurate measurement of the internal and external temperature of the battery during the charging and discharging process of the battery, and improve the quality of the lithium-ion battery. safety of use.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a system and method for monitoring the temperature of a cylindrical lithium ion battery. Background technique [0002] Lithium-ion batteries have been more and more widely used due to their advantages such as high energy density, long cycle life and environmental protection. It appears in various fields such as electric vehicles, electric bicycles, mobile phones, energy storage and 3C digital. [0003] With the widespread use of lithium batteries, the safety accidents caused by them have attracted more and more people's attention, causing consumers' fear. In this case, the safety performance of lithium-ion batteries has become the most concerned performance in the production process of lithium batteries. Although lithium-ion batteries have a high energy density, they are prone to generate heat during charging and discharging. These heats are mainly due to the physical heating c...

AI Technical Summary

Problems solved by technology

Although lithium-ion batteries have a high energy density, they are prone to generate heat during charging and discharging. These heats are mainly due to the physical heating caused by the battery's own resistance and the heating caused by chemical reactions. These heats will accumulate under certain conditions. At the same time, if the heat accumulates for a long time and is not released in time, it may cause the battery to overheat, which will affect the electrical performance and safety performance of the battery

[0004] How to monitor the temperature inside the lithium-ion battery has become the top priority in the production of lithium-ion batteries. The usual way to measure the battery temperature is to measure the surface temperature of the battery during the safety test process (such as overcharge, short circuit, extrusion) to measure the temperature of the battery. Measure whether the battery meets the corresponding safety standards or use a thermal imager to monitor the temperature change of the lithium-ion battery during charging and discharging. The above-mentioned methods have large measurement errors and cannot represent the real temperature and temperature changes inside the battery, which restricts the safety research of lithium-ion batteries. development of

In addition, each part of the battery is not a good conductor of temperature, and there will be hysteresis in heat conduction, which is also very unfavorable for the safety research of lithium-ion batteries

Images