Prismatic Battery Tab Grouping and Metal Interlayer
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Solution Overview
Problem
Current prismatic secondary batteries face challenges in achieving high energy density and reliable current collection structures, which hinder their assembly and performance in electric vehicles and hybrid electric vehicles.
Innovation Solution
The design incorporates a stacked electrode body with positive and negative electrode tab portions, a metal member held by a holding member, and a collector connected to the tab groups, along with a pressure-sensitive current breaking mechanism, to enhance energy density and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wound electrode body with exposed portions at both ends is used, then current collection is improved, but spaces are required in the battery case which reduces energy density
Solution Approach 1:
The patent merges the positive and negative electrode exposed portions to the same end of the electrode body, allowing both current collectors to be positioned at one location. This consolidation eliminates the need for separate spaces at both ends of the battery case, thereby improving energy density while maintaining reliable current collection through the unified tab group structure.
Solution Approach 2:
The patent transitions from a spatial distribution where exposed portions are at opposite ends (one-dimensional arrangement) to a configuration where both exposed portions are stacked at the same end (two-dimensional stacking). This dimensional reorganization optimizes space utilization within the battery case, eliminating wasted spaces and improving energy density.
2Quantity of substance
If electrode bodies are configured to achieve high energy density, then assembly difficulty increases
Solution Approach 1:
The patent segments the electrode body into distinct groups: a first tab group (positive electrode), a metal member, and a second tab group (negative electrode). This segmentation allows each component to be independently positioned and connected, simplifying the assembly process while achieving high energy density through the compact stacked arrangement at one end.
Solution Approach 2:
The metal member serves as an intermediary component positioned between the first and second tab groups. It facilitates the connection and spatial arrangement of the electrode tabs, making assembly easier by providing a structured interface while enabling the compact configuration required for high energy density.
3Volume of stationary object
If tab groups are stacked without intermediate structures, then space is reduced, but connection reliability decreases
Solution Approach 1:
The patent implements a nested structure where the metal member is positioned between and connects the first and second tab groups. This nested arrangement allows the tab groups to be closely stacked, maximizing space utilization, while the intermediate metal member ensures reliable electrical connection and mechanical stability between the electrodes.
Data Source
AI summary
An electrode body including a positive electrode plate and a negative electrode plate is accommodated in a prismatic outer package having an opening. The opening of the prismatic outer package is sealed with a sealing plate. The electrode body includes positive electrode tab portions stacked at an end portion on the sealing plate side. The stacked positive electrode tab portions are divided into two forming a first tab group and a second tab group. A resin member serving as a holding member holding a metal member is fixed to the sealing plate. The metal member is disposed between the first tab group and the second tab group. Lead portions of a positive electrode collector is connected to the first tab group and the second tab group at a surface positioned opposite to a surface that opposes the metal member.