Secondary Battery Short Inducing Member for Pressure Safety
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Solution Overview
Problem
Secondary batteries face instability and potential explosion risks in harsh environments due to external pressures or shocks, as existing designs lack effective mechanisms to prevent electrical short circuits.
Innovation Solution
Incorporating a short inducing member between current collectors that electrically short-circuits when the battery case shape changes beyond a predetermined pressure level, using a material with low electric resistivity like copper to minimize heat generation and ensure quick current passage, thereby preventing explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short inducing member is added to prevent explosion in pressurized environments, then reliability is improved, but device complexity increases
Solution Approach 1:
A short inducing member is introduced as an intermediary component between the first and second current collectors. This member remains electrically isolated during normal operation but makes contact with both current collectors when the case deforms under external pressure, creating a controlled short circuit path that prevents thermal runaway without requiring complex monitoring or control systems.
Solution Approach 2:
The short inducing member is designed to automatically activate the safety function through its own deformation and movement in response to case pressure changes. The component self-regulates the short circuit activation based on the physical state of the battery housing, eliminating the need for external sensors, control circuits, or power sources to detect and respond to dangerous conditions.
2Loss of energy
If the short inducing member is made of low resistivity material like copper, then heat generation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The electrical resistivity parameter of the short inducing member is changed to a low value by selecting copper or copper-like materials. This parameter change reduces Joule heating during the short circuit event. The manufacturing precision challenge is addressed by designing the component with clear geometric features and standardized dimensions that can be reliably produced using conventional metal forming techniques.
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 solution effectively prevents explosions and ensures excellent stability and reliability of secondary batteries in pressurized environments by inducing a controlled short circuit when external pressures exceed safe limits, maintaining operational safety.
Implementation Method 1
a short inducing member disposed between the first current collector and the second current collector, the short inducing member being configured to electrically short-circuit the first current collector and the second current collector when a shape of the case is changed
Implementation Method 2
the short inducing member being configured to electrically short-circuit the first current collector and the second current collector
Implementation Method 3
using a material with low electric resistivity like copper to minimize heat generation and ensure quick current passage
Data Source
AI summary
A secondary battery including an electrode assembly, the electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case, the case accommodating the electrode assembly; a first current collector and a second current collector electrically connected to the first electrode plate and the second electrode plate of the electrode assembly, respectively; and a short inducing member disposed between the first current collector and the second current collector, the short inducing member being configured to electrically short-circuit the first current collector and the second current collector when a shape of the case is changed.