A thermally balanced lithium-ion battery pack

Abstract

The invention discloses a thermal equalization lithium ion battery pack. The battery pack comprises a battery pack box body and a battery module group arranged in the battery pack box body, the battery module group is formed by a plurality of battery modules arranged in parallel, every battery module is formed through superposing a plurality of square single cells along the thickness direction, the battery modules are separated by insulating plates, the insulating plates are closely laminated to the shells of the single cells for forming the battery modules, every insulating plate is provided with heat conduction holes, and the heat conduction holes are filled with a pasty insulating and heat conducting material. The battery module group is a cuboid-shaped battery module group, the external surface of the battery module group is provided with a heat conduction layer closely laminated to the surface of the battery module group, the insulating plates are laid outside the heat conduction layer, every insulating plate is provided with the plurality of heat conduction holes, and the heat conduction holes are filled with the pasty insulating and heat conducting material, so heat in the thermal equalization lithium ion battery pack can rapidly reach equalization, the working voltages of all single cells in the battery modules are balanced, and the heat dissipation and shock vibration effects of the battery pack are good.

Description

technical field [0001] The invention relates to the technical field of battery packs, in particular to a lithium-ion battery pack with rapid internal heat balance. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, high output power, fast charging and discharging, and green and low pollution. With the popularity of green energy, the application range of lithium-ion batteries is becoming more and more extensive. In order to meet the requirements of large capacity and high voltage, it is necessary to connect several single cells in parallel to form a large-capacity lithium-ion battery module, and then connect several large-capacity lithium-ion battery modules in series to form a high-voltage large-capacity lithium-ion battery module. Group, high-voltage and large-capacity lithium-ion battery module, electronic components, protection devices, interfaces of other external systems (such as high voltage, auxiliary ...

AI Technical Summary

Problems solved by technology

The air and insulating materials prevent the rapid balance of heat in the battery pack, resulting in a large temperature difference inside the battery module, affecting the consistency and reliability of the entire battery pack

[0004] Since the internal resistance of the power lithium-ion battery is at the milliohm level, the difference in the resistance of the conductive connecting piece will affect the current distribution of each single cell in the battery module, resulting in a difference in the working voltage of the single cells in the same battery module. This difference will also amplify the temperature difference between single cells, which in turn affects the consistency and reliability of the entire battery pack

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