Lithium battery pack with self-heating system

Abstract

The invention discloses a lithium battery pack with a self-heating system. The lithium battery pack comprises a battery box body, a plurality of battery core bodies arranged in the battery box body, and a battery management system module, a temperature monitoring module and a battery self-heating module which are matched. The temperature monitoring module is configured to monitor the temperaturesof the battery core bodies in real time, the battery self-heating module includes a plurality of PTC heating fins wound on the surfaces of the battery core bodies, the PTC heating fins of each sets ofbattery core bodies are connected through one PCB heating tradition board, the PCB heating tradition boards are electrically connected with the battery core bodies through an anode heating relay anda cathode heating relay, and the battery management system module starts the anode heating relay and the cathode heating relay according to the monitoring signals of the temperature monitoring modulein real time to achieve the self-heating for the battery core bodies after power on. The lithium battery pack with a self-heating system is simple and compact in structure, high in integration degree,uniform in heating and high in safety.

Description

technical field [0001] The invention mainly relates to the technical field of lithium battery pack processing, in particular to a lithium battery pack with a self-heating system. Background technique [0002] With my country's policy support for new energy and the rapid development of related technologies, lithium battery packs are increasingly used in various fields, especially in the fields of new energy, electric vehicles, and electric energy storage. At the same time, countries around the world and major companies eager to seek a way out of energy structure transformation have also stepped up research and development efforts. The continuous innovation of positive and negative electrode material technology and the continuous improvement of battery capacity make the lithium battery PACK more and more practical, and the application fields are getting wider and wider. However, the existing lithium battery packs have the following technical problems: [0003] First, the app...

AI Technical Summary

Problems solved by technology

As the temperature decreases, the internal resistance of the battery increases, the electrochemical reaction speed slows down, the polarization internal resistance increases rapidly, and the battery discharge capacity and discharge platform decrease, resulting in a decrease in charge and discharge capacity and capacity

However, some existing lithium battery packs cannot achieve real-time rapid heating, which affects the efficient use of lithium battery packs

[0004] Second, some existing lithium battery packs need to be equipped with a special heating system, which has low energy density, insufficient integration, and large volume, which is not conducive to the installation and maintenance of battery packs.

[0005] The third is that some existing lithium battery packs are heated unevenly, the local heating temperature is too high, and the local heating temperature cannot reach a reasonable range, which seriously affects the efficient use of the battery

[0006] Fourth, the safety of some existing lithium battery packs is low, and the degree of heating cannot be monitored and controlled in real time

Since lithium-ion batteries also have restrictions on high-temperature environments, when the temperature is too high, the internal pressure of lithium-ion batteries with electrolyte inside will gradually increase. At least, the explosion-proof valve will open and the electrolyte will leak, and at worst, it will explode. pose a great threat to the safety performance of the battery

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