Battery Sealing Structure for Pressure-Triggered Current Interruption
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Solution Overview
Problem
The operational reliability of current interrupt devices in power storage devices is compromised due to the displacement of leads when the base of the gasket undergoes deformation, affecting the device's ability to disconnect the protrusion from the lead in response to increasing internal pressure.
Innovation Solution
A power storage device design that includes a reinforcing member between the base of the gasket and the lead, which prevents deformation of the base and reduces the displacement of the lead, ensuring proper operation of the current interrupt device by maintaining the connection between the lead and the base even when the protrusion is displaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead is made difficult to displace to enhance operational reliability of the current interrupt device, then the operational reliability is improved, but the lead cannot accommodate the displacement of the protrusion when the base deforms
Solution Approach 1:
The patent introduces a reinforcing member as an intermediary element between the base and the lead. This reinforcing member has a second through hole that aligns with the first through hole in the base, allowing the protrusion to pass through both. The reinforcing member provides structural support to prevent base deformation while maintaining the displacement path for the protrusion, thus mediating between the need for stability and the need for adaptability.
2Ease of operation
If the base of the gasket is allowed to deform to accommodate protrusion displacement, then the current interrupt function is enabled, but the lead displaces along with the protrusion impairing operational reliability
Solution Approach 1:
The patent segments the structural support function from the displacement accommodation function. The reinforcing member provides structural support to the base, preventing excessive deformation that would cause lead displacement. Meanwhile, the aligned through holes in both the base and reinforcing member maintain the displacement path for the protrusion, enabling the current interrupt function while preserving lead stability.
3Reliability
If a reinforcing member is added to prevent base deformation, then the lead connection integrity is maintained, but the device complexity increases
Solution Approach 1:
The reinforcing member serves multiple functions: it provides structural support to prevent base deformation, maintains the alignment of through holes for protrusion passage, and preserves the lead connection integrity. By consolidating these functions into a single component, the patent minimizes the increase in device complexity while achieving multiple benefits.
Data Source
AI summary
A power storage device includes a case, a power storage element, a lead, and a sealing member. The sealing member includes an insulating gasket that includes a base; and a conductive sealing plate. The sealing plate includes a displaceable part that includes a protrusion projecting toward the power storage element. The base is disposed between the sealing plate and the power storage element. The power storage device further includes a reinforcing member reinforcing the base. The base includes a first through hole, and the reinforcing member includes a second through hole. The protrusion is inserted in the first and second through holes. The protrusion is connected to the lead. The protrusion is disconnected from the lead when displaced in a direction away from the lead in response to an increase in internal pressure of the case.