Pouch Battery Cell Conductive Frame for Sealed Terminal Connection
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Solution Overview
Problem
The exposure of electrode leads in pouch-type secondary battery cells weakens the sealing force of the pouch case, leading to potential venting defects due to increased internal pressure.
Innovation Solution
A battery cell design featuring a conductive frame electrically coupled to the electrode lead within the cell case, secured by fastening members, and partially covered by an insulating frame, which maintains the sealing force while allowing for reduced electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrode lead is exposed to the outside of the pouch case to function as a terminal, then electrical connection is enabled, but the sealing force of the pouch case is weakened
Solution Approach 1:
A conductive frame is introduced as an intermediary component between the electrode lead and the external environment. The conductive frame is disposed on the pouch case and electrically connected to the electrode lead, allowing electrical connection to be made to the terminal without exposing the electrode lead itself. This mediator enables the electrical function while preserving the sealing integrity of the pouch case.
2Ease of operation
If multiple layers are formed in the electrode lead drawing region to enable electrical connection, then terminal function is achieved, but the sealing force in that region is reduced
Solution Approach 1:
The electrode lead is extracted from the pouch case interior and kept inside, while its terminal function is transferred to the conductive frame on the exterior. By taking out the terminal function from the electrode lead drawing region and placing it on the conductive frame, the multi-layer structure is eliminated from the sealing region, thereby restoring the sealing force while maintaining electrical connection capability.
3Strength
If the electrode lead is kept inside the cell case, then sealing force is maintained, but electrical connection to external terminals becomes difficult
Solution Approach 1:
The conductive frame serves as an intermediary that bridges the interior electrode lead and the exterior environment. It is disposed on the pouch case surface and electrically connected to the electrode lead, providing an external access point for electrical connection without requiring the electrode lead to be exposed or drawn out, thus maintaining both sealing force and electrical connectivity.
4Ease of operation
If a component is drawn out through the joint portion of the pouch case to function as a terminal, then electrical connection is enabled, but the sealing force at the joint portion is deteriorated
Solution Approach 1:
The terminal function is extracted from the joint portion of the pouch case and relocated to the conductive frame disposed on the pouch case surface. By removing the need for components to pass through the joint portion, the sealing integrity at this critical location is preserved while electrical connection functionality is maintained through the conductive frame structure.
Data Source
AI summary
Disclosed is a battery cell, which includes an electrode assembly having a cell body and an electrode tab extending from the cell body; a cell case having an accommodation portion configured to accommodate the electrode assembly and a circumferential portion extending outward from the accommodation portion; an electrode lead electrically coupled to the electrode tab; and a conductive frame disposed on a first surface of the circumferential portion and electrically coupled to the electrode lead through the first surface of the circumferential portion.