Prismatic Battery Deformation Plate for Overcharge Current Interruption
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Solution Overview
Problem
Existing prismatic secondary batteries lack a reliable mechanism to prevent overcharging, which can lead to increased internal pressure and potential safety hazards.
Innovation Solution
A secondary battery design featuring a deformation plate with a specific shape and grooves that deforms to disconnect the conduction path between the electrode and terminal when internal pressure exceeds a predetermined value, ensuring smooth operation of the current interrupting mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current interrupting mechanism is installed in a secondary battery, then reliability against overcharge is improved, but device complexity increases
Solution Approach 1:
The deformation plate automatically interrupts the current path when internal pressure increases due to overcharge, without requiring external control systems. The plate's own deformation under pressure serves as both the sensor and actuator, making the system self-regulating and eliminating complex control mechanisms.
Solution Approach 2:
The invention extracts only the essential function of current interruption from complex battery management systems. By using a simple deformation plate that physically blocks the current path when deformed, it separates the safety function from the overall battery system, reducing overall device complexity while maintaining reliability.
2Reliability
If the deformation plate deforms to disconnect the conduction path, then overcharge prevention is improved, but electrical resistance increases
Solution Approach 1:
The deformation plate has a localized deformation region with grooves that concentrate the deformation effect. This ensures that only the necessary portion of the plate deforms to interrupt the current, minimizing the overall increase in electrical resistance while achieving reliable current interruption at the critical location.
Solution Approach 2:
The plate deforms partially rather than completely, using just enough deformation to interrupt the current path. The grooves are designed to guide this partial deformation, ensuring sufficient current interruption while avoiding excessive deformation that would unnecessarily increase electrical resistance in non-critical areas.
3Ease of manufacture
If the deformation plate has a simple structure, then ease of manufacture is improved, but manufacturing precision decreases
Solution Approach 1:
The grooves are pre-formed on the deformation plate during manufacturing, establishing the deformation pattern in advance. This preliminary structuring ensures that when the plate deforms under pressure, it follows a predetermined path that achieves consistent current interruption, reducing variability without requiring complex post-manufacturing adjustments.
Solution Approach 2:
The deformation plate is segmented into regions with different functions: the thick central portion for structural integrity and the grooved regions for controlled deformation. This segmentation allows each region to be optimized independently, maintaining manufacturing simplicity while achieving precise deformation behavior through the combination of simple geometric features.
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 design provides a reliable secondary battery that effectively prevents overcharging by ensuring smooth disconnection of the conduction path, avoiding leaks and maintaining sealability while reducing electrical resistance and process variations.
Implementation Method 1
the deformation plate deforms when an internal pressure of the battery case reaches a predetermined value or higher
Implementation Method 2
the deformation plate deforms when an internal pressure of the battery case reaches a predetermined value or higher, and the deformation of the deformation plate causes electrical disconnection
Implementation Method 3
the thick portion is weld-connected to the current collector to form a weld
Data Source
AI summary
A secondary battery includes an electrode body including a positive electrode plate and a negative electrode plate; a battery case containing the electrode body; a positive electrode terminal attached to the battery case; a conductive member having an opening adjacent to the electrode body; a deformation plate that seals the opening, and a current collector. The positive electrode plate and the positive electrode terminal are electrically connected to each other via a first positive electrode current collector, the deformation plate, and the conductive member. The deformation plate has a thick portion, which has a larger thickness than the surrounding area, in a central part. The thick portion of the deformation plate is welded to the first positive electrode current collector to form a weld.