Turnable Plate Terminal for Secondary Battery Safety
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Solution Overview
Problem
Conventional current cut-off structures in electric vehicle batteries fail to prevent overheating and potential fires during nail penetration tests, as they cannot accommodate additional resistance elements, leading to insufficient safety measures.
Innovation Solution
A secondary battery design featuring a turnable plate and resistance element connected to the cap plate, which cuts off electrical connections when internal pressure exceeds a reference pressure, reducing loop current and heat generation during nail penetration tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional current cut-off structure is used with a turnable plate directly connected to the cap plate, then the battery can cut off the main circuit to prevent overcharging, but the battery cannot accommodate additional resistance elements and fails the nail penetration test
Solution Approach 1:
The patent introduces a connecting plate as an intermediary component between the turnable plate and the cap plate. This connecting plate provides a separate mounting surface for resistance elements, allowing current to pass through these elements during nail penetration tests to reduce heating and sparking, while maintaining the overcharge protection function of the turnable plate.
2Device complexity
If the turnable plate is directly electrically connected to the cap plate, then the structure is simple, but extra resistance elements cannot be added to the cap plate
Solution Approach 1:
The patent segments the electrical connection path by introducing a connecting plate as a separate component. This segmentation allows the cap plate to have both the turnable plate connection and resistance elements mounted on it, as the connecting plate serves as an intermediate structure that distributes the electrical connection functions.
3Object-affected harmful factors
If a resistance element is added to reduce current during nail penetration, then safety improves, but the device structure becomes more complex
Solution Approach 1:
The patent merges multiple functions into the connecting plate: it serves as an electrical connection component between the turnable plate and cap plate, and simultaneously as a mounting platform for resistance elements. This merging approach adds safety functionality without proportionally increasing structural complexity.
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 battery ignition by reducing current flow and heat during nail penetration tests, enhancing safety and energy density by allowing additional space for the electrode component.
Implementation Method 1
when a pressure inside the secondary battery exceeds a reference pressure, the turnable plate (40) turns over to cut off an electrical connection between the turnable plate (40) and the first electrode plate
Implementation Method 2
the connecting plate (20) is electrically connected to the cap plate (10) through the resistance element (90)... reducing loop current and heat generation during nail penetration tests
Implementation Method 3
reducing loop current and heat generation during nail penetration tests
Data Source
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AI summary
The present application provides a secondary battery including a first terminal component, a second terminal component (30), a cap plate (10), an electrode component and a resistance element (90). One of the first and second terminal components is electrically connected to the cap plate (10) through the resistance element (90), while the other is insulated from the cap plate (10). The first terminal component includes a connecting plate (20) and a turnable plate (40) attached to each other. When the battery is in a normal state, a first electrode plate is electrically connected to the connecting plate (20) through the turnable plate (40), and the second electrode plate is electrically connected to the second terminal component (30). When a pressure inside the battery exceeds a reference pressure, the turnable plate (40) turns over to cut off an electrical connection between the turnable plate (40) and the first electrode plate.