Rechargeable Battery Separation Member for Vent Blockage Prevention
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Solution Overview
Problem
High power rechargeable batteries face safety issues due to internal pressure buildup from gas discharge, which can lead to explosion when the electrode assembly blocks the vent hole, preventing efficient gas release.
Innovation Solution
A rechargeable battery design incorporating a separation member with a support plate and interception plate to maintain a sufficient distance between the electrode assembly and the cap plate, allowing for unobstructed gas discharge through a vent member and preventing the electrode assembly from rising and blocking the vent hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sufficient space is formed between the vent and the electrode assembly to stably discharge gas, then gas discharge stability is improved, but the internal pressure increases and the electrode assembly may block the vent hole
Solution Approach 1:
A separation member is introduced as an intermediary component between the electrode assembly and the vent. This separation member includes a support plate that contacts the electrode assembly and a vent plate that contacts the vent, maintaining a predetermined space between them. The intermediary structure prevents direct contact while ensuring stable gas discharge passage, resolving the contradiction between discharge stability and pressure buildup.
Solution Approach 2:
The separation member is pre-installed to maintain the predetermined space between the electrode assembly and the vent before gas generation occurs. By establishing this spatial relationship in advance, the system prevents electrode assembly displacement that would block the vent, thereby maintaining reliable gas discharge while controlling internal pressure.
2Reliability
If the electrode assembly is allowed to move toward the cap plate, then the vent can be blocked to prevent gas discharge, but this causes internal pressure increase and potential explosion
Solution Approach 1:
The separation member acts as a mediator that prevents the electrode assembly from directly contacting and blocking the vent. By maintaining a predetermined space through the support plate and vent plate structure, it ensures gas discharge pathways remain open, preventing pressure buildup that could lead to explosion while maintaining safety.
Solution Approach 2:
The separation member preemptively prevents the harmful action of electrode assembly blocking the vent by maintaining a fixed spatial relationship. This preliminary structural arrangement counteracts the potential displacement of the electrode assembly before it can block the vent, thereby preventing the harmful effect of pressure buildup and explosion.
3Object-affected harmful factors
If a vent fracturable at predetermined pressure is installed to prevent explosion, then safety is improved, but gas discharge may be blocked by electrode assembly rising with gas discharge pressure
Solution Approach 1:
The separation member serves as an intermediary structure that decouples the electrode assembly from the vent. The support plate contacts the electrode assembly while the vent plate contacts the vent, maintaining a predetermined space that prevents electrode assembly from blocking the vent during gas discharge, ensuring both safety and discharge efficiency.
Solution Approach 2:
The predetermined space is established in advance through the separation member structure before gas discharge occurs. This preliminary spatial arrangement ensures that when gas discharge happens, the electrode assembly cannot rise to block the vent, maintaining reliable gas discharge efficiency while the fracturable vent provides explosion prevention.
Data Source
AI summary
A rechargeable battery includes an electrode assembly having a positive electrode, a negative electrode, and a separator located between the positive electrode and the negative electrode; a case housing the electrode assembly, the case having an opening; a cap assembly including a cap plate coupled to the opening of the case and a vent member on the cap plate adapted to discharge a gas from the case; and a separation member located between the electrode assembly and the cap plate to prevent the electrode assembly from significantly moving toward the cap plate.