Method for realizing tight serial and parallel connection on cylindrical battery cells in battery pack

Abstract

The invention discloses a method for realizing tight serial and parallel connection on cylindrical battery cells in a battery pack. According to the method, firstly, a plurality of battery cells which have the same appearances and are in cylindrical shapes are mutually parallelly gathered for forming several rows, then, bridge connection fixation is carried out at the round cross section part of each battery cell through welding connecting sheets for forming the battery pack consisting of a plurality of battery cells, and the single battery cell is connected with the adjacent electric cells in the current row through the welding connecting sheets and is also welded with one battery cell in the adjacent row, so the welding connecting sheets of the battery cell and other two connected battery cells form obtuse angle or acute angle fixed connection structures, and the two obtuse angle or acute angle fixed connection structures are connected into a Z shape. The method has the advantages that through a plurality of piled and gathered battery cells in the battery pack, the battery cells are adopted and are directly provided with Z-shaped or square-shaped welding connecting sheets, so the battery cells realize the serial and parallel connection conduction on the circuit structure, and in addition, the piled and gathered battery cells cannot easily become loose like solid gum or fixing support frames.

Description

Technical field: [0001] The invention relates to the structure of electric cores in a battery pack, in particular to a method for realizing close series-parallel connection of cylindrical electric cores in a battery pack by improving solder tabs. Background technique: [0002] At present, the DC large-capacity battery pack uses long strip soldering tabs to connect the internal cells. Specifically, it is realized by arranging a plurality of cylindrical electric cores 100 in a row, and then using the elongated soldering piece 110 to perform butt welding with the arranged electric cores. Its style is like figure 1 shown. [0003] However, this connection method has the following disadvantages: [0004] 1. The combination of adjacent battery cells is single and inflexible, which is not conducive to the connection of large battery packs. [0005] 2. The connection between the battery cells is not tight and unstable, and additional external auxiliary materials are needed to ma...

AI Technical Summary

Problems solved by technology

[0004] 1. The combination of adjacent batteries is single and inflexible, which is not conducive to the connection of large battery packs

[0005] 2. The connection between the battery core and the battery core is not tight and unstable, and additional external auxiliary materials are needed to make it tightly connected, such as double-sided tape, brackets, etc.

[0006] 3. Butt welding requires high-precision positioning fixtures and skilled workers, which increases production costs and difficulties in disguise

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