Prismatic Battery Collector Attachment and Tab Arrangement
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Solution Overview
Problem
Conventional methods for manufacturing prismatic secondary batteries face challenges in increasing energy density due to space requirements for exposed electrode core portions and complex collector structures, hindering the development of high-energy-density batteries for electric vehicles.
Innovation Solution
A method involving the attachment and electrical connection of positive and negative electrode collectors to a sealing plate, with tab portions connected in a specific arrangement to minimize space usage, allowing for the assembly of electrode body elements that enhance energy density by reducing the volume occupied by the collector portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods with wound electrode bodies are used, then the battery can be manufactured with exposed core portions at both ends, but the energy density decreases due to required spaces for left and right exposed portions and upper space between sealing plate and electrode body
Solution Approach 1:
The patent segments the electrode body structure by positioning exposed core portions at opposite ends (first end and second end) rather than both at one end, and divides the battery case into specific zones (first case portion, second case portion, third case portion) to optimize space utilization. This segmentation allows for more efficient packing of active materials while maintaining manufacturing reliability.
Solution Approach 2:
The patent transitions from a conventional single-end exposure configuration to a multi-dimensional space optimization approach by utilizing both ends of the battery case for exposed core portions and creating specific spatial relationships between electrode bodies and case portions. This dimensional reorganization maximizes the volume available for active materials, thereby increasing energy density.
2Quantity of substance
If electrode bodies with exposed core portions at one end are used, then energy density increases, but manufacturing complexity increases due to complex collector portion assembly
Solution Approach 1:
The patent merges the collector portion assembly process with the electrode body assembly by integrating the connection of positive and negative electrode collectors to the sealing plate with the positioning of electrode bodies. This consolidation simplifies the overall manufacturing process while maintaining the space-efficient single-end exposure configuration that enhances energy density.
Solution Approach 2:
The patent performs preliminary positioning and connection of collectors to the sealing plate before final electrode body assembly. This preliminary action ensures proper alignment and reduces manufacturing complexity by establishing fixed reference points early in the assembly process, allowing for more efficient subsequent steps.
3Ease of manufacture
If more space is allocated for collector portions, then assembly is simplified, but the volume available for active materials decreases, reducing energy density
Solution Approach 1:
The patent applies local quality optimization by allocating specific case portions (first, second, and third case portions) with distinct functions - some areas optimized for collector access and connection, while other areas maximize active material volume. This localized differentiation allows simplified assembly in critical areas without sacrificing overall energy density.
Solution Approach 2:
The patent optimizes the spatial parameters of the battery case and electrode body arrangement, specifically the positioning of exposed core portions at opposite ends and the definition of case portions, to achieve an optimal balance between collector assembly accessibility and active material volume. These parameter changes enable both ease of manufacture and high energy density.
Data Source
AI summary
A first electrode body element and a second electrode body element including a positive electrode plate and a negative electrode plate are fabricated, a first positive electrode tab group of the first electrode body element and a second positive electrode tab group of the second electrode body element are connected to a lead portion of a positive electrode collector attached to a sealing plate, a first negative electrode tab group of the first electrode body element and a second negative electrode tab group of the second electrode body element are connected to a lead portion of a negative electrode collector attached to the sealing plate, and the first electrode body element and the second electrode body element are arranged together as one such that an electrode body is formed.