Rechargeable Battery Connecting Tabs for Uniform Current Distribution
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Solution Overview
Problem
Rechargeable batteries experience reduced service life and output due to temperature deviations and unbalanced charging/discharging caused by concentrated current density at electrode terminals and tabs, leading to degradation.
Innovation Solution
The design includes a pair of electrode assemblies with connecting tabs that connect in parallel, distributing current density uniformly across the electrodes, reducing temperature differences and extending the battery's service life by minimizing heat concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current is concentrated at electrode terminals and tabs for efficient charging/discharging, then charging/discharging efficiency is improved, but temperature deviations and degradation occur reducing service life
Solution Approach 1:
The electrode assembly is divided into multiple segments with multiple tabs distributed along the length of the electrodes. Instead of having current flow through a single concentrated tab, the current path is segmented into multiple parallel paths through multiple tabs, distributing the current density and reducing localized heating that would otherwise reduce service life.
2Power
If current density is concentrated at tabs connected to electrode terminals, then electrical connection efficiency is improved, but temperature differences are generated causing unbalanced charging/discharging
Solution Approach 1:
Multiple tabs are distributed at different locations along the electrode assembly, creating local current collection points throughout the structure. This distributes the electrical connection function across multiple locations rather than concentrating it at single terminals, resulting in more uniform current density and reduced temperature differences across the electrode assembly.
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
Uniform current distribution reduces temperature differences within the electrode assemblies, enhancing the battery's performance and longevity by preventing degradation and ensuring balanced charging and discharging.
Implementation Method 1
current density is concentrated in areas of the tabs of the electrode assembly, which are connected to the electrode terminals, temperature deviations may be generated in the electrode assembly
Data Source
AI summary
A rechargeable battery according to one or more exemplary embodiments includes: a pair of electrode assemblies, each including a first electrode including a coated region, a tab, and a connecting tab, a second electrode including a coated region, a tab, and a connecting tab, and a separator between the first electrode and the second electrode, the first electrode, the separator, and the second electrode being wound; a case accommodating the pair of electrode assemblies; a cap plate at an opening of the case and defining terminal openings; and first and second electrode terminals respectively connected to the tabs of the first and second electrodes and respectively passing through the terminal openings. The pair of electrode assemblies are electrically connected to each other via the connecting tabs.