Prismatic Battery Deformation Plate Current Collection
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Solution Overview
Problem
Current prismatic secondary batteries face challenges in achieving high energy density and reliable current collection structures, particularly in electric vehicles and hybrid electric vehicles, due to space constraints and assembly complexities.
Innovation Solution
A prismatic secondary battery design featuring a stacked electrode body with positive and negative electrode tab portions connected to collectors, a deformation plate that cuts off the conductive path when pressure exceeds a certain value, and a resin member holding a metal member to facilitate easy assembly and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wound electrode body with exposed portions at both ends is used, then the battery can be assembled with the sealing plate, but spaces are required on left and right sides and upper space between sealing plate and electrode body, reducing energy density
Solution Approach 1:
The patent transitions from a wound electrode body (cylindrical geometry requiring lateral spaces) to a stacked electrode body (planar geometry allowing vertical compression). This dimensional change enables the electrode body to be compressed in the vertical direction between the sealing plate and diaphragm, eliminating the need for lateral spaces and significantly increasing energy density while maintaining assembly capability.
Solution Approach 2:
Instead of having exposed electrode portions at both ends (wound structure), the patent inverts the configuration by having exposed tab portions at only one end (stacked structure). This inversion allows the electrode body to be positioned closer to the sealing plate without requiring lateral clearance, thereby increasing the active material volume and energy density.
2Quantity of substance
If electrode body is positioned close to sealing plate to increase energy density, then space is optimized, but reliable current collection structure becomes difficult to achieve
Solution Approach 1:
The patent segments the current collection function into distinct components: tab portions at the electrode body end, collectors that bridge the gap, and terminals on the sealing plate. This segmentation allows each component to be optimized independently - the tab portions can be positioned close to the sealing plate for space efficiency, while the collectors and terminals provide reliable electrical connection pathways.
Solution Approach 2:
The patent introduces collectors as intermediary components between the tab portions and terminals. These collectors serve as mediators that maintain reliable electrical connection even when the electrode body is positioned close to the sealing plate, thus enabling both high energy density and reliable current collection.
3Reliability
If complex current collection structure is used to ensure reliability, then connection quality improves, but assembly complexity increases
Solution Approach 1:
The patent merges the current collection function with the electrode plate structure itself by forming tab portions directly from the electrode core body. This integration eliminates the need for separate complex current collection components, simplifying assembly while maintaining reliable electrical connection through the inherent conductivity of the electrode material.
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
The design achieves a higher energy density and reliability by optimizing the current collection structure, reducing assembly complexity, and minimizing space requirements, while ensuring high connection quality and suppressing potential damage.
Implementation Method 1
a deformation plate provided in a conductive path between the positive electrode plate or the negative electrode plate and the terminal, the deformation plate being deformed when a pressure inside the battery becomes equivalent to or above a predetermined value
Data Source
AI summary
A prismatic secondary battery in which a deformation plate becoming deformed when a pressure inside the battery becomes equivalent to or higher than a predetermined value is disposed in a conductive path between a positive electrode plate and a positive electrode terminal. A positive electrode collector electrically connected to the positive electrode plate includes a collector body portion disposed on an electrode body side of the deformation plate, a collector connection that extends from an end of the collector body portion in a longitudinal direction of a sealing plate towards the sealing plate, and a lead portion that extends from the collector connection in the longitudinal direction of the sealing plate. A positive electrode tab portion is connected to the lead portion.