Power Storage Sealing Body Slit for Reliable Pressure Venting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power storage devices face reliability issues with their explosion prevention mechanisms, as the sealing body deteriorates over time, leading to potential rupture before the mechanism operates, due to a mismatch between the sealing strength and the operating pressure of the explosion prevention mechanism.
Innovation Solution
A power storage device with a sealing body featuring a slit that extends radially inward from a second pressing part, allowing gas to escape when internal pressure exceeds a predetermined threshold, maintaining high operation reliability by ensuring the slit remains functional despite sealing body deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is formed on the case bottom surface as an explosion prevention mechanism, then the case can release gas when internal pressure rises, but the groove bottom has inferior strength and may cause the sealed part to rupture before the mechanism operates
Solution Approach 1:
The case bottom is segmented into a groove portion and a pressing part portion. The groove is formed only in the groove portion, while the pressing part maintains full strength to prevent rupture. This segmentation allows the groove to function for pressure relief while the pressing part provides structural support.
Solution Approach 2:
A pressing part is introduced as an intermediary structure between the groove and the sealed part. This pressing part reinforces the groove area, preventing rupture while allowing the groove to operate for pressure relief. The pressing part acts as a mediator that maintains structural integrity at the weak groove location.
2Duration of action of stationary object
If the sealing body deteriorates over time, then the sealing strength decreases and case internal pressure at rupture decreases, but the explosion prevention mechanism operating pressure remains unchanged
Solution Approach 1:
The explosion prevention mechanism is designed to operate at a predetermined pressure threshold that is established in advance, independent of sealing body condition. This preliminary set pressure ensures that when the sealing body deteriorates and allows pressure to build up, the explosion prevention mechanism will activate before rupture occurs, regardless of how much the sealing strength has degraded.
Solution Approach 2:
The groove structure serves as a beforehand cushioning measure against sealing body deterioration. By providing a pressure relief path that operates at a fixed threshold, the system compensates for the gradual loss of sealing strength over time, ensuring safety even as the sealing body ages and deteriorates.
3Reliability
If a groove or slit extends from one end edge to the other on the sealing body, then it can function as an explosion prevention mechanism, but it may open even when case internal pressure does not increase much due to sealing body deterioration
Solution Approach 1:
The groove is localized to only the groove portion of the case bottom, not extending through the entire case structure. The pressing part maintains full integrity and does not contain grooves. This local placement ensures the groove only activates at the intended pressure threshold and prevents premature opening due to sealing body deterioration.
Solution Approach 2:
The pressing part acts as an intermediary that prevents the groove from opening prematurely. By maintaining structural integrity in the pressing part area, it prevents the groove from activating due to minor pressure changes caused by sealing body deterioration, ensuring activation only occurs at the proper pressure threshold.
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 device maintains high operation reliability by ensuring the explosion prevention mechanism operates effectively, preventing unexpected rupture and ensuring safety even with deteriorated sealing bodies.
Implementation Method 1
The case includes a first pressing part and a second pressing part in a vicinity of the opening. The first pressing part that presses a side surface of the sealing body and protrudes to an inside of the case, and the second pressing part that presses an upper surface of the sealing body.
Implementation Method 2
The sealing body includes a slit on the upper surface of the sealing body. The slit extends radially inward of the case with respect to the second pressing part and opens at the side surface of the sealing body.
Data Source
AI summary
A power storage device of the present disclosure includes: a power storage element; a case that houses the power storage element, the case having a bottomed tubular shape and including an opening at one end of the case; and a sealing body that seals the opening. The case includes a first pressing part and a second pressing part in a vicinity of the opening. The first pressing part presses a side surface of the sealing body and protrudes to an inside of the case, and the second pressing part presses an upper surface of the sealing body. The sealing body includes a slit on the upper surface of the sealing body. The slit extends radially inward of the case with respect to the second pressing part and opens at the side surface of the sealing body.