Rectangular Battery Shielding Valve Molten Eruption
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Solution Overview
Problem
In large rectangular secondary batteries, when a gas discharge valve is activated due to increased pressure from an abnormality, there is a risk of high-temperature molten materials and sparks erupting, which compromises the battery's reliability.
Innovation Solution
A shielding member made of metal is positioned between the gas discharge valve and the electrode body within the battery casing to prevent high-temperature molten materials and sparks from escaping, enhancing the battery's reliability by using either the current collecting member as the shielding member or a separate component connected to the battery's inner surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas discharge valve is activated to release pressure, then gas can be discharged from the battery case, but high-temperature molten materials and sparks may erupt from the valve
Solution Approach 1:
A shielding member made of heat-resistant material is positioned between the gas discharge valve and the electrode body to intercept and block molten materials and sparks before they can erupt outward. This intermediary component allows the gas discharge valve to function normally while preventing the harmful effects of molten materials and sparks from reaching the exterior.
2Reliability
If a shielding member is added to prevent molten materials and sparks, then reliability increases, but device complexity increases
Solution Approach 1:
The shielding member is designed to serve multiple functions: it acts as both a structural support element and a protective barrier against molten materials and sparks. By integrating these functions into a single component, the design avoids adding excessive complexity while achieving the desired safety improvement.
Solution Approach 2:
The shielding member is designed as a simple, inexpensive component made from heat-resistant material that can be easily manufactured and integrated. Rather than designing a complex active protection system, a passive shielding structure provides effective protection at low cost and minimal structural complexity.
Data Source
AI summary
To provide a highly reliable rectangular secondary battery. A rectangular secondary battery (20) includes: an electrode body (3) that includes a positive electrode plate and a negative electrode plate; a rectangular casing (1) that includes an opening and that contains the electrode body (3); and a sealing plate (2) that seals the opening of the rectangular casing (1). The sealing plate (2) includes a gas discharge valve (17) that ruptures when the pressure inside the rectangular casing (1) has a predetermined value or more to discharge gas inside the rectangular casing (1) to outside the rectangular casing (1). A portion of a second negative electrode current collector (8b) is disposed, as a shielding member, at a location that is between the sealing plate (2) and the electrode body (3) and that faces the gas discharge valve (17).