Battery End Cover Assembly With Rotatable Pressure Relief Vent

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Solution Overview

Problem

Existing battery cell designs face challenges in improving performance, particularly in terms of energy density and service life, due to the arrangement of pressure relief members and liquid injection holes, which leads to irreversible damage and limited electrolyte replenishment capabilities.

Innovation Solution

The introduction of a rotatable pressure relief device with a clamping mechanism that allows for easy disassembly and assembly, integrating the pressure relief function with the liquid injection process through a single through hole, thereby reducing space occupation and enhancing energy density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a pressure relief member is welded to the end cover to ensure sealing, then sealing reliability is improved, but the pressure relief member cannot be disassembled for electrolyte replenishment and causes irreversible damage when destroyed

Engineering Contradiction:

Improvesealing reliabilityVSAvoidelectrolyte replenishment capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The pressure relief device is divided into separate components: the end cover, the pressure relief member, and the sealing ring. The pressure relief member is not welded to the end cover but is held in place by the sealing ring, allowing the pressure relief member to be removed and replaced independently for electrolyte replenishment while maintaining sealing reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pressure relief member is designed to be replaceable rather than permanent. When the pressure relief member is destroyed during pressure relief, it can be recovered, replaced, and the sealing ring reinstalled to restore the seal, enabling electrolyte replenishment and extending battery service life.

Inventive Principle:

Principle #34Discarding and recovering

2Stability of the object's composition

If the pressure relief device is fixed to the end cover, then structural stability is improved, but metal chips generated during disassembly fall into the battery cell causing short circuits

Engineering Contradiction:

Improvestructural stabilityVSAvoidmetal chip contamination

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The clamping mechanism is extracted and positioned on the outer surface of the end cover, away from the battery cell interior. This allows the pressure relief device to be securely fixed during operation while enabling safe disassembly outside the battery cell to prevent metal chip contamination.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The clamping mechanism acts as an intermediary that provides secure fixation during normal operation but can be easily released for maintenance. It mediates between the need for structural stability and the need for safe disassembly, allowing the pressure relief device to be firmly held in place while enabling controlled removal without contaminating the battery cell.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If separate holes are provided for pressure relief and liquid injection, then functional independence is improved, but space occupation increases reducing energy density

Engineering Contradiction:

Improvefunctional independenceVSAvoidspace occupation

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The pressure relief function and liquid injection function are merged into a single through-hole in the end cover. The pressure relief member can be removed through this hole for pressure relief, and the same hole is used for liquid injection during maintenance, eliminating the need for separate holes and reducing space occupation to increase energy density.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The through-hole is designed to serve multiple functions: it acts as the pressure relief pathway when the pressure relief member is in place, and serves as the liquid injection pathway when the pressure relief member is removed. This multi-functional design eliminates redundant structures and maximizes space utilization for higher energy density.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12294121B2End cover assembly, housing assembly, battery cell, battery, and electric equipment

Publication Date: 2025.05.06 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

An end cover assembly includes: an end cover with a through hole for injecting electrolyte and a first clamping portion, wherein the first clamping portion is disposed along a circumferential direction of the through hole and is located on one side of the end cover away from an interior of the battery cell; a sealing ring for sealing the through hole; and a pressure relief device covering at least part of the sealing ring and closing the through hole; wherein the pressure relief device includes a second clamping portion, and is rotatable such that when the pressure relief device is rotated to a first position, the second clamping portion is clamped with the first clamping portion; and when the pressure relief device is rotated to a second position, the second clamping portion is disengaged from the first clamping portion.