Electrochemical Cell Clamp Structure for Seal and Tab Integrity
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Solution Overview
Problem
Electrochemical cells face challenges in maintaining the integrity of seals and electrode connections under conditions such as elevated temperatures and shipping, leading to potential failure due to internal pressure and mechanical stress.
Innovation Solution
A clamp system that applies a compressive clamp force to reinforce contacts between portions of the electrochemical cell container and electrode tabs, using a combination of lower and upper clamp portions with a compressible article to ensure even pressure distribution, and a housing that applies an anisotropic force normal to the electrode active surface during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamp system applies compressive force to reinforce seals and electrode connections, then the reliability of contacts is improved, but the device complexity increases
Solution Approach 1:
The clamp system is divided into multiple independent components: upper clamp portion, lower clamp portion, and compressible article. This segmentation allows each component to perform a specific function (clamping force application, structural support, and pressure distribution) while collectively achieving reliable contact reinforcement without requiring a monolithic complex structure.
Solution Approach 2:
A compressible article is introduced as an intermediary element between the clamp portions and the electrochemical cell components. This intermediary distributes the compressive force evenly across the contact surfaces, preventing localized stress concentrations that could damage seals or electrode tabs while maintaining reliable electrical and mechanical contacts.
2Productivity
If the housing applies anisotropic force normal to electrode active surface, then electrode utilization is improved, but the stress on internal components increases
Solution Approach 1:
The anisotropic force application is localized to specific regions of the electrochemical cell through the housing structure. By applying normal force selectively to the electrode active surfaces rather than uniformly across all components, the system improves electrode utilization while concentrating stress only where necessary for electrochemical performance, minimizing impact on other internal components.
Solution Approach 2:
The compressible article serves as a cushioning element that absorbs and distributes the anisotropic forces generated during charge/discharge cycles. This pre-positioned cushioning protects seals, electrode tabs, and other internal components from excessive stress while allowing the housing to apply the necessary normal force to the electrodes for optimal performance.
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 clamp system effectively maintains the integrity of seals and electrode connections, preventing failure under challenging conditions by distributing compressive forces and stabilizing the connections, while the anisotropic force improves electrode utilization and reduces issues like surface roughening and dendrite formation.
Implementation Method 1
a compressible article between the lower clamp portion and the upper clamp portion
Implementation Method 2
compressible article between the lower clamp portion and the upper clamp portion
Implementation Method 3
the housing is configured to apply, during at least one period of time during charge and/or discharge of the electrochemical cell, an anisotropic force with a component normal to an electrode active surface
Data Source
AI summary
Clamps for electrochemical cells and related systems and methods are generally described. In some embodiments, a clamp system can apply a compressive clamp force to reinforce a contact between first and second portions of a container of an electrochemical cell (e.g., to reinforce a seal of an electrochemical cell pouch). In some embodiments, a clamp system can apply a compressive clamp force to reinforce electronic communication between an electrode tab and an electrode tab extension. Application of such compressive clamp forces via a clamp may assist with maintaining integrity of contacts (e.g., seals, electrode tab connections) under challenging conditions such as during testing of the electrochemical cell (e.g., at elevated temperatures) and/or during shipping.