Battery Tab Root Recess Structure for Bend Stress Relief
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Solution Overview
Problem
The reliability of lithium-ion batteries is compromised due to tab rebound issues when tabs are bent to reduce battery volume, affecting connection stability and packaging reliability.
Innovation Solution
A battery design featuring a multilayer body with a conductive portion and a second layer having a recessed region to disperse bending stress at the root of the tabs, improving connection stability and reducing rebound probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If tabs are bent to reduce battery volume, then battery volume is reduced, but tab rebound occurs affecting connection stability
Solution Approach 1:
The patent applies local quality by creating a recessed structure specifically at the tab root area where bending stress concentrates. This localized structural modification allows the tab to be bent for volume reduction while the recessed region provides stress relief and prevents rebound, thereby maintaining connection stability despite the bending operation.
Solution Approach 2:
The recessed structure is designed in advance at the tab root position to cushion and absorb bending stress before it can cause rebound. This pre-configured stress-absorbing feature ensures that when the tab is bent, the stress is distributed into the recessed region, preventing the harmful rebound effect and maintaining reliable electrical connection.
2Volume of moving object
If tabs are bent to reduce battery volume, then battery volume is reduced, but bending stress at tab root increases
Solution Approach 1:
The patent introduces a recessed structure specifically at the tab root position where bending stress concentrates. This localized geometric modification creates additional volume in the stress concentration zone, allowing bending stress to be distributed into the recessed region rather than being concentrated at a single point, thereby reducing peak stress while enabling volume reduction through tab bending.
Solution Approach 2:
The recessed structure serves as a pre-configured stress-absorbing feature that cushions bending stress before it can cause damage or rebound. By providing this stress-relief geometry in advance at the critical tab root position, the patent enables safe tab bending for volume reduction without excessive stress accumulation.
3Volume of moving object
If tabs are bent to reduce battery volume, then battery volume is reduced, but rebound probability increases
Solution Approach 1:
The patent applies local quality by creating a recessed structure specifically at the tab root area where rebound originates. This localized structural feature provides stress relief precisely where needed, allowing the tab to be bent for volume reduction while the recessed region prevents the elastic rebound that would otherwise occur, thereby maintaining reliable electrical connection.
Solution Approach 2:
The recessed structure is designed in advance to cushion and absorb the elastic energy that would cause rebound. This pre-configured stress-absorbing feature ensures that when the tab is bent, the rebound tendency is counteracted by the stress-distributing geometry of the recessed region, maintaining stable electrical connection.
Data Source
AI summary
A battery including a multilayer body, a first conductive portion, a second layer, and a housing. The multilayer body includes a first conductive layer, a second conductive layer, and a first layer positioned therebetween, the first layer including an insulating material. The first conductive portion is electrically connected to the first conductive layer, and the first conductive portion extends in a first direction away from the multilayer body. The housing encompasses the multilayer body, and the housing encompasses a portion of the first conductive portion and a portion of the second layer. When viewed along a third direction perpendicular to both the first direction and the second direction, the second layer includes a first region that overlaps with the first conductive portion and a second region apart from the first conductive portion, where in the first direction, the second region has a first recess recessed toward the housing.