Laminated Cell Tab Layout Without Bus Bars for Series-Parallel Joining
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Solution Overview
Problem
Existing laminated battery technologies require space and increase weight when using bus bars for parallel and series connections, and lack methods for direct joining of positive and negative electrode terminals in combined connections.
Innovation Solution
A cell laminate design where first and second laminated cells connected in parallel are directly joined in series without a bus bar, using bent tab leads made of aluminum and copper, respectively, to reduce dimension and weight by eliminating the need for conductive connection members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bus bars are used for joining positive and negative electrode terminals in parallel and series connections, then electrical connection is achieved, but space is required and total weight increases
Solution Approach 1:
The patent extracts and eliminates the bus bar component from the battery assembly. Instead of using separate conductive connection members, the positive and negative electrode terminals themselves are directly welded to each other to achieve both parallel and series connections, thereby removing the unnecessary bus bars and reducing total weight
Solution Approach 2:
The patent merges the functions of electrical connection and structural support into a single integrated design. The electrode terminals serve dual purposes: as conductive elements for electrical connection and as structural components for mechanical support, eliminating the need for separate bus bars
2Reliability
If bus bars are used for joining positive and negative electrode terminals in parallel and series connections, then electrical connection is achieved, but space for the bus bar is required
Solution Approach 1:
The patent extracts and eliminates the bus bar component from the battery assembly. Instead of using separate conductive connection members, the positive and negative electrode terminals themselves are directly welded to each other to achieve both parallel and series connections, thereby removing the unnecessary bus bars and reducing total weight
Solution Approach 2:
The patent merges the functions of electrical connection and structural support into a single integrated design. The electrode terminals serve dual purposes: as conductive elements for electrical connection and as structural components for mechanical support, eliminating the need for separate bus bars
3Weight of stationary object
If direct joining of positive and negative electrode terminals is implemented without bus bars, then weight and space are reduced, but connection complexity must be managed
Solution Approach 1:
The patent segments the battery assembly into modular units with standardized terminal configurations. By dividing the system into manageable sections with consistent wiring patterns, the complexity of direct terminal connections is reduced and made more manageable
Solution Approach 2:
The patent employs preliminary arrangement of electrode terminals with pre-determined welding positions and configurations. The terminals are positioned and prepared in advance to facilitate straightforward direct welding connections, reducing the complexity of the joining process
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 design reduces the dimension and weight of the cell laminate, improves energy density, and simplifies assembly by eliminating the need for bus bars and reducing joining time.
Implementation Method 1
a positive electrode tab lead and a negative electrode tab lead are directly joined
Data Source
AI summary
A cell laminate includes: a plurality of laminated cells that are laminated, wherein the plurality of laminated cells include a plurality of first laminated cells and a plurality of second laminated cells, each of first electrode tab leads of the plurality of first laminated cells and second electrode tab leads of the plurality of second laminated cells has a bent portion, and wherein a bent portion of a second electrode tab lead of a second laminated cell closest to the plurality of first laminated cells extends to overlap a bent portion of a first electrode tab lead of a first laminated cell farthest from the plurality of second laminated cells among the plurality of first laminated cells, and each of the bent portions of the plurality of first electrode tab leads overlaps and is directly joined to at least one bent portion of the plurality of second electrode tab leads.