Liquid-cooled cylindrical cell battery module

Abstract

The invention discloses a liquid-cooled cylindrical cell battery module comprising a battery body and a hollow fastener. The battery body comprises a plurality of battery modules connected in series,the fastener passes through the battery modules connected in series and locks, and a cooling liquid is introduced into the hollow fastener. Each of the battery modules comprises a cell unit which comprises a plurality of single cylindrical cells, and the two ends of the cell unit are provided with heat conduction frames. The invention provides the liquid-cooled cylindrical cell battery module, cell positive and negative electrodes are directly connected in series, the assembly problem in the production and manufacturing process is greatly simplified, and the production efficiency is improved.A bridging copper piece or aluminum piece between the positive and negative electrodes is canceled, and the energy density of the module is increased. At the same time, the cooling liquid circulates in the whole module, a cooling system and an electrical system are separated, and the safety of the battery module is improved. The cooling system and a fastening system are combined, the number of parts is reduced, and the energy density of the module is increased.

Description

technical field [0001] The invention belongs to the technical field of cylindrical cell battery modules, in particular to a liquid-cooled cylindrical cell battery module. Background technique [0002] At present, most of the module grouping modes of cylindrical cells are natural cooling. A typical solution for liquid cooling modules is Tesla's serpentine tube liquid cooling solution. However, the serpentine liquid cooling scheme (such as figure 1 As shown, taking the 37P9S module with 18650 cells as an example) has the following disadvantages: (1), the 18650 cells connected in series and parallel require the positive and negative electrodes of the cells to be assembled alternately, and the positive poles of each 37 cells face upwards. The positive poles of the adjacent 37 battery cells face down, which increases the difficulty of the manufacturing and assembly process, making it easy to assemble the wrong direction of the battery cells and cause the entire module to be scr...

AI Technical Summary

Problems solved by technology

However, the serpentine liquid cooling scheme (such as figure 1 As shown, taking the 37P9S module with 18650 cells as an example) has the following disadvantages: (1), the 18650 cells connected in series and parallel require the positive and negative electrodes of the cells to be assembled alternately, and the positive poles of each 37 cells face upwards. The positive poles of the adjacent 37 battery cells face down, which increases the difficulty of the manufacturing and assembly process, making it easy to assemble the wrong direction of the battery cells and cause the entire module to be scrapped; After being assembled to the lower bracket, because the serpentine tube needs to be insulated and its side wall needs to be pasted with a heat-conducting silicone pad in order to eliminate manufacturing tolerances, it requires an interference fit between the serpentine tube and the battery cell, making it difficult to assemble the serpentine tube. It is difficult to realize automatic production, resulting in low production efficiency and high cost; (3) because the positive and negative electrodes of the battery need to be connected in series, the copper sheets 4 need to be connected in series, resulting in excessive copper sheets and increased weight, making the entire mold The grouping efficiency of the group is reduced

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