Secondary Battery Protection Member with Pressure-Sensitive Curing Layer
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Solution Overview
Problem
Secondary batteries face safety issues due to internal gas generation leading to increased or decreased internal volume, causing pressure on components and potentially resulting in degraded functionality or explosion, especially under high potential and high temperature conditions.
Innovation Solution
A secondary battery design incorporating a protection member with a protective film that separates a curing promoter and an adhesive, which reacts to form a curing layer when pressure exceeds a predetermined threshold, preventing further expansion or explosion by reinforcing the internal case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the secondary battery uses materials to improve energy density and operating voltage, then performance is improved, but internal gas generation under high potential and high temperature conditions increases, leading to safety issues
Solution Approach 1:
The patent applies preliminary action by pre-installing a protection member containing adhesive and curing promoter inside the battery case before assembly. This protection member is designed to react and form a curing layer only when internal pressure increases due to gas generation, thereby preventing explosion or deformation before they occur. The protective film separates the adhesive and curing promoter until needed, ensuring they are ready to act immediately when the safety threshold is exceeded.
2Volume of stationary object
If the internal volume of the secondary battery changes due to gas generation, then pressure on components increases, but the battery structure lacks sufficient protection against this pressure
Solution Approach 1:
The patent applies parameter changes by utilizing the phase transition and chemical reaction properties of the adhesive and curing promoter. When internal pressure reaches a critical level, these materials undergo a chemical reaction to form a curing layer with different physical properties (higher strength and rigidity). This dynamic parameter change allows the battery structure to adapt to pressure changes, transforming from a soft state to a hardened protective state that can withstand the increased internal pressure without exploding or deforming.
3Reliability
If a protection member is added to prevent explosion, then safety is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating multiple functions into a single protection member component. The protection member combines the adhesive, curing promoter, and protective film into one unified structure that performs multiple functions: separating the reactive materials during normal operation, detecting pressure increases through film rupture, initiating the curing reaction, and forming the protective layer. This consolidation reduces the number of separate components needed while maintaining comprehensive safety functionality.
Solution Approach 2:
The protective film serves as an intermediary element that separates the adhesive and curing promoter during normal battery operation. This film allows the two materials to coexist without reacting prematurely while still permitting their interaction when needed. The film acts as a controlled barrier that ruptures at a specific pressure threshold, thereby mediating between the need to prevent premature reaction and the need to enable protective reaction when safety threats arise.
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 maintains the battery in a safe state by forming a curing layer inside the case when pressure increases, preventing further expansion or explosion, thus enhancing safety and preventing physical impacts on other components.
Implementation Method 1
the protective film may be configured to be destroyed when pressure is equal to or greater than a predetermined pressure
Implementation Method 2
the curing promoter and the adhesive may contact and react with each other when the protective film is destroyed. In particular, a curing layer may be formed inside the case when a reaction between the curing promoter and the adhesive occurs
Data Source
AI summary
A secondary battery is provided. The secondary battery includes an electrode assembly, a case that accommodates the electrode assembly, and a protection member disposed within the case. The protection member includes a curing promoter, an adhesive, and a protective film that separates the curing promoter and the adhesive.