Novel grouping structure of large cylindrical battery cells

Abstract

The invention discloses a novel grouping structure of large cylindrical battery cells. The novel grouping structure comprises a plurality of battery cells, and a battery cell group consisting of an upper bracket and a lower bracket at two ends of the battery cells; the middle parts of the upper bracket and the lower bracket are respectively provided with a plurality of filling columns and glue pouring columns which are matched with each other; the filling columns are provided with gaskets for interfering the movement of the circumferential battery cells; glue filling holes matched with the filling columns are formed in the centers of the glue filling columns; glue is arranged in the glue filling holes; busbars are arranged at the two ends of the battery cell group; and a heat conduction pad, a heating film and a heat preservation pad are sequentially arranged on the outer sides of the busbars. The invention provides a novel grouping structure of large cylindrical battery cells, which can improve the welding tear resistance of an aluminum tab of the large cylindrical battery cell, balance the heating area of a single battery cell and ensure the temperature rise consistency.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a novel group structure of large cylindrical batteries. Background technique [0002] With the progress and development of society, the intelligentization of warehousing, family, travel, etc., the diversification of mobile consumer electronic products, and the battery as a provider of clean energy make it more and more sought after by consumers. Favored, become an integral part of electronic products. [0003] In the application process, by improving the reliability and safety of the battery pack, improving the temperature environment of the battery pack to adapt to the harsh environment, and helping to improve user satisfaction has become a very meaningful research topic. [0004] In the prior art, the radial dimension of the cylindrical cell is taken as an example of the 18650 cell, and the size data is relatively concentrated and stable, while the diameter range of ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the radial dimension of the cylindrical cell is taken as an example of the 18650 cell, and the size data is relatively concentrated and stable, while the diameter range of the cylindrical cell of the ultra-large-diameter cell is relatively large, and the tab is made of aluminum, and the tab and the The connecting piece is usually connected by laser welding, and the welding bonding force of aluminum alloy is weak. Affected by vibration, the diameter range of the bracket is large, resulting in a large gap with the bracket. The risk of cracking, that is, the failure of the power supply circuit

Secondly, in order to make the battery pack adapt to the harsh winter environment with low temperature and supply heat to the battery pack, usually the heating of the battery pack is achieved by wrapping the surface of the battery core to heat the battery core, but this way of winding cannot achieve the heating of the battery pack. The control of the effective contact area will result in uneven heating of each battery cell, resulting in inconsistent discharge internal resistance of each battery cell due to temperature, so the battery cells will generate mutual supplementary electricity, etc. If this is the case for a long time, the battery cells will be discharged ahead of schedule. Entering the aging period, the mileage is lower than the expected life value, which brings a bad experience to the user

Images