Lead-Acid Battery Lid Joint Detection via Isolated Guide Passage
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Solution Overview
Problem
The existing lead-acid battery design with a tunnel-shaped exhaust passage for guiding gas from the second exhaust hole to the discharge opening is ineffective in detecting the joint state between the lid body and lid body cover due to blockage by a valve, preventing the detection of abnormal joint conditions.
Innovation Solution
The lead-acid battery incorporates a guide passage system with different guide directions, including upward, horizontal, and downward guide portions, and omits the second exhaust hole, allowing gas to be discharged through a cutout for radial direction discharge, ensuring reliable gas discharge and joint state detection by isolating the guide passage from an annular groove, and using locking portions with elongated holes to accommodate thermal expansion and shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tunnel-shaped exhaust passage is used to guide gas from the second exhaust hole to the discharge opening, then gas discharge function is achieved, but the joint state between lid body and lid body cover cannot be detected due to blockage by valve
Solution Approach 1:
The exhaust system is segmented into two separate pathways: a first exhaust passage (tunnel-shaped) for gas discharge that remains blocked by the valve, and a second exhaust passage (annular groove) for detection purposes. This segmentation allows the detection function to operate independently from the gas discharge function, resolving the contradiction between maintaining reliable gas discharge and enabling joint state detection.
Solution Approach 2:
The annular groove acts as an intermediary detection channel that bypasses the valve blockage. By providing this alternative pathway that communicates with the interior space without being blocked by the valve, the system can detect joint state abnormalities through pressurized air injection while the main gas discharge function remains intact through the original tunnel-shaped passage.
2Difficulty of detecting and measuring
If the guide passage is isolated from the annular groove, then joint state detection becomes possible, but gas discharge path becomes more complex
Solution Approach 1:
The interior space formed by the recessed portion serves multiple functions: it acts as both the guide passage for directing gas from exhaust holes to the particular cell chamber, and as the detection chamber for joint state detection through the annular groove. This multi-functionality reduces overall system complexity while achieving both gas discharge and detection objectives.
Solution Approach 2:
The guide passage and detection system are merged through the shared interior space. The annular groove connects to this interior space, which also serves as the guide passage. This merging allows the detection system to utilize the existing gas flow path structure, minimizing additional complexity while enabling joint state detection.
3Stability of the object's composition
If locking portions with elongated holes are used, then thermal expansion and shrinkage are compensated, but manufacturing precision requirements increase
Solution Approach 1:
The locking portions utilize parameter changes in the form of elongated holes that allow positional adjustment to accommodate thermal expansion and shrinkage. The elongated geometry provides a range of motion that absorbs dimensional changes due to temperature variations, maintaining stable attachment despite thermal effects.
Solution Approach 2:
The elongated holes in the locking portions provide beforehand cushioning for thermal dimensional changes. By designing the locking mechanism with built-in adjustment capacity through the elongated geometry, the system prepares for and accommodates thermal expansion and shrinkage before they cause misalignment or detachment issues.
Data Source
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AI summary
There is provided a lead-acid battery in which the joint state between a lid body and a lid body cover can be checked based on both the joint state between a protruding portion in the periphery of a second exhaust hole and a joining portion of the lid body cover, and the joint state between a protruding portion of the lid body and a joining portion of the lid body cover. The lead-acid battery comprises: a container having at least one cell chamber; a lid body 1 for covering a top opening of the container, the lid body 1 having on a top surface a recessed portion 4, the recessed portion 4 having therein an annular protruding portion 4C protruding upward and having, in an area of a bottom wall inside the protruding portion, an exhaust hole 4D for exhausting gas from the cell chamber, wherein a guide passage for guiding gas from the exhaust hole 4D to the outside is formed by joining the protruding portion 4C with a joining portion provided on the lid body cover; an annular groove 4M formed between the protruding portion and the vertical wall is covered with an outer periphery of the lid body cover 5; and the guide passage is isolated from the groove 4M.