Battery Pack Cell Arrangement for Welding Efficiency
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Solution Overview
Problem
Existing battery packs face inefficiencies in the welding process due to suboptimal spatial arrangements of secondary battery cells and conductive plates, leading to reduced welding quality and increased error possibilities during automatic welding operations.
Innovation Solution
The battery pack design features a stack of cells arranged with non-perpendicular center connecting lines along a short axis, utilizing conductive plates with multiple welding points and current fences to facilitate efficient welding by an automatic device moving in a straightforward up-down and left-right direction, optimizing movement flow and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells are arranged with perpendicular center connecting lines along the long axis, then the spatial arrangement is simple and regular, but the welding operation efficiency is reduced and errors increase
Solution Approach 1:
The patent applies asymmetry by arranging cells such that the center connecting lines of adjacent cells along the long axis are non-perpendicular to the short axis. This asymmetric arrangement optimizes the welding device's movement flow, allowing it to perform welding operations more efficiently while reducing errors, despite increasing spatial arrangement complexity.
2Reliability
If multiple welding points are included in connection parts, then welding quality and reliability are improved, but the complexity of the conductive plate structure increases
Solution Approach 1:
The conductive plate's connection parts are segmented into multiple welding points, with each welding point separated by current fences. This segmentation allows the welding device to perform multiple precise welding operations on different cells simultaneously or sequentially, improving welding quality and reliability while managing structural complexity through modular design.
Solution Approach 2:
Different regions of the conductive plate are designed with different numbers and arrangements of welding points based on local requirements. Connection parts are configured with specific welding point positions and current fence placements optimized for the particular cells they connect, achieving high welding quality without uniformly increasing complexity across the entire structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances welding operation efficiency and quality by allowing precise welding without rotating the stack, improving space utilization and reducing errors in the welding process.
Implementation Method 1
The conductive plates may be welded to top and bottom surfaces of the cells, respectively, according to a connection method of the cells
Implementation Method 2
Each of the connection parts may include a current fence separating the at least two welding points from each other by a predetermined distance
Data Source
AI summary
A battery pack including a stack, the stack including a plurality of cells having different polarities at top and bottom surfaces thereof, the plurality of cells being arranged such that at least two cells are arranged along a short axis of the stack when viewed from top or bottom surfaces of the cells, and center connecting lines of adjacent cells along a long axis of the stack are other than perpendicular to the short axis; and conductive plates electrically connecting the plurality of cells to each other, each of the conductive plates including connection parts electrically connected to the cells and a linking part between the connection parts, wherein each of the connection parts includes at least two welding points and a line connecting the welding points, the line being parallel with the short axis of the stack.