Pouch Battery Electrode Lead Notch Segmentation
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Solution Overview
Problem
Pouch type secondary batteries lack sufficient protection mechanisms to warn users of impending electrical connection interruption due to increasing internal pressure from gas generation, posing safety risks, especially in applications like electric vehicles.
Innovation Solution
The implementation of multiple electrode leads with notches on their bonding surfaces, allowing staged detachment as pressure increases, providing a resistance-based warning system to notify users of replacement needs before complete electrical disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electrode lead is used in pouch type secondary batteries, then the device complexity is reduced, but the reliability is insufficient because users cannot be warned before electrical connection interruption occurs
Solution Approach 1:
The electrode lead is divided into multiple segments (first electrode lead and second electrode lead) connected in series. Each segment can be independently detached at different pressure thresholds, enabling staged warning functionality. The first electrode lead includes a first notch for initial detachment at lower pressure, while the second electrode lead includes a second notch for final detachment at higher pressure, providing users with advance warning before complete electrical connection interruption.
Solution Approach 2:
The electrode leads are pre-configured with notches at specific positions that determine detachment pressure thresholds. The first notch is positioned to detach at a lower pressure level, providing early warning, while the second notch is positioned for detachment at a higher pressure level, providing final warning. This preliminary configuration enables the system to warn users in advance before complete electrical connection failure occurs.
2Reliability
If multiple electrode leads with notches are implemented, then the reliability and safety warning capability are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The electrode lead system is segmented into multiple independent leads (first and second electrode leads) with distinct notches. This segmentation allows each notch to be manufactured and positioned independently, reducing the cumulative precision requirements compared to a single complex lead with multiple notches. Each notch can be positioned with standard manufacturing tolerances, and the staged detachment functionality emerges from the series configuration rather than requiring precise coordination of multiple notches in a single component.
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 solution enables users to anticipate and prepare for electrical connection interruption, enhancing safety by providing a staged warning mechanism that increases resistance as pressure builds, allowing for timely battery replacement and preventing sudden power loss.
Implementation Method 1
when the inside of a case is expanded... when a gas is generated in a case to increase in pressure
Implementation Method 2
the plurality of electrode leads may be detached in stages with respect to the positions, on which the notches are provided, to increase in resistance
Data Source
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AI summary
To solve the above problem, a pouch type secondary battery according to an embodiment of the present invention includes: an electrode assembly in which an electrode including a positive electrode and a negative electrode and a separator are laminated; a battery case having a pouch shape to accommodate the electrode assembly; an electrode tab connected to the electrode and protruding from one side of the electrode; a first electrode lead having one end connected to the electrode tab; a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to the outside of the battery case; and a connection part bonding the first electrode lead to the second electrode lead to connect the first and second electrode leads to each other, wherein, in at least one of the first and second electrode leads, at least one notch is provided on a boding surface on which the first and second electrode leads are bonded to each other through the connection part.