Jelly Roll Electrode Assembly With Swelling Tape for Low Resistance
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Solution Overview
Problem
Existing rechargeable batteries face challenges in maintaining low internal resistance and stability due to the expansion of electrodes during charging and discharging, which can lead to increased internal resistance and potential damage.
Innovation Solution
The integration of a swelling tape with a substrate layer and adhesive layer, containing swelling particles, is applied to the uncoated portion of the electrode, which expands to maintain stable contact with the battery case, reducing internal resistance and enhancing electrode stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrodes are allowed to expand freely during charging and discharging, then electrode capacity is maintained, but internal resistance increases and electrode stability deteriorates
Solution Approach 1:
A swelling tape comprising a substrate layer and swelling particles is attached to the electrode plate. The swelling particles expand when absorbing electrolyte, generating swelling pressure that compensates for electrode volume changes during charging and discharging, thereby maintaining stable contact between the electrode and current collector while preserving electrode capacity.
Solution Approach 2:
The swelling particles undergo parameter changes in volume when absorbing electrolyte. This volume expansion of the swelling particles is utilized to dynamically adjust the tape's thickness and maintain optimal contact pressure between the electrode and current collector throughout the charging and discharging cycles.
2Reliability
If swelling tape is attached to electrode uncoated portion, then internal resistance is reduced and electrical connection is stabilized, but device complexity increases
Solution Approach 1:
The swelling tape is selectively attached only to the uncoated portion of the electrode plate where current collector exposure occurs, rather than covering the entire electrode. This localized application maintains electrical connection stability at the critical interface while minimizing additional structural complexity and material usage.
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 swelling tape effectively stabilizes the electrode assembly by maximizing thickness expansion in the radial direction, ensuring stable electrical connection and reducing internal resistance, thereby enhancing the battery's performance and safety.
Implementation Method 1
a swelling tape that is attached to at least one of both surfaces of the uncoated portion and includes a swelling particle
Implementation Method 2
The swelling tape effectively stabilizes the electrode assembly by maximizing thickness expansion in the radial direction
Implementation Method 3
The swelling tape may include a substrate layer and an adhesive layer, and the swelling particle may be included in the adhesive layer
Data Source
AI summary
An electrode assembly includes a first electrode, a first separator on the first electrode, a second electrode on the first separator, the second electrode including an outer uncoated portion, a second separator on the second electrode, the first electrode, the first separator, the second electrode, and the second separator being wound into a jelly roll shape, and the outer uncoated portion of the second electrode being at an outermost turn of the jelly roll shape, and a swelling tape attached to at least one of opposite surfaces of the outer uncoated portion of the second electrode, the swelling tape including swelling particles.