End Cover Vent Recess for Accurate Battery Explosion Threshold

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Solution Overview

Problem

Existing energy-storage devices have a high air pressure in the gap between the explosion-proof valve and the protective sheet, leading to a decrease in the accuracy of the explosion threshold of the explosion-proof valve.

Innovation Solution

The end cover assembly includes a top cover with a vent recess that communicates with the explosion-proof hole, allowing air inside the explosion-proof hole to be discharged, which maintains normal air pressure and improves the accuracy of the explosion threshold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the protective sheet and explosion-proof valve are mounted directly on the top cover without a vent recess, then the structure is simpler, but high air pressure builds up in the gap causing the protective sheet to wrinkle and shift, reducing explosion threshold accuracy

Engineering Contradiction:

Improveexplosion threshold accuracyVSAvoidtop cover structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The top cover is segmented into functional zones: a first mounting surface for the explosion-proof valve, a second mounting surface for the protective sheet, and a vent recess with gradual width increase to discharge air pressure. This segmentation allows each component to perform its specific function while maintaining overall system reliability and preventing protective sheet deformation.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the vent recess has a uniform width, then the manufacturing is easier, but air pressure discharge is insufficient causing protective sheet shifting

Engineering Contradiction:

Improveprotective sheet position stabilityVSAvoidvent recess geometry

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The vent recess employs local quality variation with width K1 gradually increasing from the explosion-proof hole toward the vent opening. This non-uniform geometry creates optimal air pressure discharge at each location: narrower near the hole for controlled pressure release, wider at the opening for efficient air egress, thereby stabilizing the protective sheet position while remaining manufacturable.

Inventive Principle:

Principle #3Local quality

3Reliability

If the protective sheet is tightly attached to the top cover, then the sealing is better, but air pressure buildup causes wrinkling and reduces explosion threshold accuracy

Engineering Contradiction:

Improveexplosion threshold accuracyVSAvoidprotective sheet flatness

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The vent recess acts as an intermediary channel between the enclosed space and the external environment. It provides a controlled pathway for air pressure discharge, allowing the protective sheet to remain tightly attached for sealing while preventing pressure buildup that would cause wrinkling. The gradual width increase optimizes the mediator function by facilitating smooth air flow.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of operation

If the vent recess width increases gradually, then air pressure discharge is more effective, but the manufacturing precision requirement increases

Engineering Contradiction:

Improveair pressure discharge efficiencyVSAvoidvent recess width gradient

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The vent recess utilizes parameter changes in its width dimension, transitioning from a smaller width near the explosion-proof hole to a larger width at the vent opening. This gradual parameter change optimizes air pressure discharge efficiency by creating a pressure gradient that facilitates smooth air flow while avoiding sudden geometric transitions that would demand excessive manufacturing precision.

Inventive Principle:

Principle #35Parameter changes

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 solution effectively reduces the risk of the protective sheet wrinkling and shifting due to high air pressure, enhancing the accuracy of the explosion threshold and improving the safety performance of the energy-storage device.

Implementation Method 1

A width K1 of the vent recess gradually increases in an extension direction of the vent recess... allowing air inside the explosion-proof hole to be discharged, which maintains normal air pressure

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentUS20250125458A1End cover assembly, energy-storage device, and electricity-consumption device

Publication Date: 2025.04.17 HITHIUM TECH HK LTD

AI summary

An end cover assembly, an energy-storage device, and an electricity-consumption device are disclosed in the present disclosure. The end cover assembly includes a top cover, an explosion-proof valve, and a protective sheet. The top cover has a first mounting surface and a second mounting surface. The top cover defines a first mounting recess, an explosion- proof hole, and a vent recess, where the first mounting recess is recessed from the first mounting surface, and the vent recess is in communication with the explosion-proof hole. The explosion-proof valve is attached to the second mounting surface and covers an opening of the explosion-proof hole positioned on the second mounting surface. The protective sheet is attached to the bottom wall of the first mounting recess and covers an opening of the explosion-proof hole positioned on the bottom wall of the first mounting recess and the other part of the vent recess.