Twisted Current Collecting Member for Battery Impact Absorption
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Solution Overview
Problem
Rechargeable batteries face challenges in effectively absorbing external forces and impacts, particularly from the narrow walls of their cases, which can lead to intrusion and potential damage during usage.
Innovation Solution
The rechargeable battery design incorporates a current collecting member with a twisted electrode connecting part that faces the case's sidewall at a predetermined inclination angle, allowing for torsional elasticity to absorb external forces and impacts, and includes notches to enhance flexibility and connection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collecting member uses a straight electrode connecting part, then the structure is simple and easy to manufacture, but it cannot effectively absorb external forces and impacts from the case sidewalls
Solution Approach 1:
The electrode connecting part is designed with a twisted surface geometry instead of a straight configuration. This curved/twisted structure enables the component to absorb external forces and impacts from the case sidewalls through torsional elasticity, directly resolving the contradiction between structural simplicity and impact absorption capability
Solution Approach 2:
The electrode connecting part incorporates notches that enhance flexibility and allow dynamic response to external forces. The twisted surface combined with notches creates a structure that can deform elastically under impact while maintaining electrical connection, transforming a static rigid structure into a dynamic force-absorbing component
2Reliability
If the electrode connecting part is twisted to face the sidewall at an inclination angle, then impact absorption is improved, but the manufacturing precision and alignment become more difficult
Solution Approach 1:
The electrode connecting part features an asymmetric twisted surface with a specific inclination angle relative to the case sidewall. This asymmetric geometry is optimized to face the narrow walls at the predetermined inclination angle, allowing the structure to effectively absorb impacts from specific directions while the patent provides guidance for achieving proper alignment during assembly
3Ease of operation
If the electrode connecting part includes notches, then flexibility and connection stability are enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The electrode connecting part is segmented by introducing notches that divide the continuous structure into sections. These notches enhance flexibility and connection stability by allowing localized deformation while maintaining overall structural integrity. The segmentation enables the component to better accommodate dimensional variations and assembly tolerances, improving ease of operation despite added manufacturing steps
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
This design effectively absorbs external forces and impacts, improving the safety and durability of the rechargeable battery by distributing and dissipating the force through the twisted surface and notches, preventing intrusion into the electrode assembly.
Implementation Method 1
The twisted surface faces a sidewall of the case at a predetermined inclination angle with respect to a direction from the sidewall toward an end of the uncoated region... effectively absorbs external forces and impacts, improving the safety and durability of the rechargeable battery by distributing and dissipating the force through the twisted surface
Data Source
AI summary
A rechargeable battery includes an electrode assembly that performs charging and discharging operations, a case having the electrode assembly enclosed therein, a cap plate coupled with an opening of the case, an electrode terminal on the cap plate, and a current collecting member connecting the electrode assembly to the electrode terminal. The current collecting member includes a terminal connecting part connected to the electrode terminal, and an electrode connecting part connected to an uncoated region of the electrode assembly, the electrode connecting part including a twisted surface, the twisted surface facing a sidewall of the case at a predetermined inclination angle with respect to a direction from the sidewall toward an end of the uncoated region.