Battery Cell Injection-Hole Sealing With a Position-Limit Boss

Solution Overview

Problem

Existing battery technologies face challenges in ensuring the long-term sealing performance of liquid injection holes, leading to potential electrolyte leakage and safety hazards due to inconsistent compression of sealing members caused by rivet inclination during the riveting process.

Innovation Solution

A battery cell design incorporating a position-limit boss on the nail cap or end cover assembly to limit the compression amount of the sealing member, ensuring consistent compression and improved sealing fit between the nail cap and end cover assembly, thereby preventing electrolyte leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If riveting is performed without a position-limit boss, then the riveting process is simple, but the compression amount of the sealing member is inconsistent due to nail body inclination, leading to poor sealing performance

Engineering Contradiction:

Improvecompression amount consistency of sealing memberVSAvoidstructure of nail cap or end cover assembly

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The position-limit boss is pre-formed on the nail cap or end cover assembly before riveting. This preliminary structural feature guides the nail body during insertion, ensuring that the sealing member is compressed to a predetermined extent and preventing excessive or insufficient compression, thereby achieving consistent sealing performance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The position-limit boss acts as an intermediary element between the nail body and the sealing member. It mediates the compression force by providing a physical stop that limits how far the nail body can penetrate, ensuring uniform compression of the sealing member regardless of slight variations in riveting alignment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the sealing member is compressed without a position-limit boss, then the riveting process is fast, but the sealing fit between nail cap and end cover assembly is poor, leading to electrolyte leakage

Engineering Contradiction:

Improvesealing performance of liquid injection holeVSAvoidriveting process efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The position-limit boss is pre-formed on the nail cap or end cover assembly before riveting. This preliminary structural feature guides the nail body during insertion, ensuring that the sealing member is compressed to a predetermined extent and preventing excessive or insufficient compression, thereby achieving consistent sealing performance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The position-limit boss acts as an intermediary element between the nail body and the sealing member. It mediates the compression force by providing a physical stop that limits how far the nail body can penetrate, ensuring uniform compression of the sealing member regardless of slight variations in riveting alignment.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the nail body is allowed to incline during riveting, then the riveting operation is easier, but the compression amounts at different positions of the sealing member are inconsistent, compromising long-term sealing performance

Engineering Contradiction:

Improveriveting operation easeVSAvoidcompression uniformity of sealing member

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The position-limit boss creates an asymmetric constraint within the otherwise symmetric riveting structure. By placing the limit at a specific location, it allows the nail body to self-align during insertion, compensating for operational tolerances and ensuring that the sealing member is compressed uniformly even when the riveting operation is performed with slight variations in alignment.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The position-limit boss acts as an intermediary element between the nail body and the sealing member. It mediates the compression force by providing a physical stop that limits how far the nail body can penetrate, ensuring uniform compression of the sealing member regardless of slight variations in riveting alignment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20230327306A1Battery cell, battery and electrical apparatus

Publication Date: 2023.10.12 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

A battery cell may comprise: a case having an opening; an end cover assembly for closing the opening, wherein the end cover assembly may be provided with a liquid injection hole, and the liquid injection hole may comprise a first hole segment; a rivet, comprising a nail cap and a nail body, wherein the nail body may pass through the first hole segment, and the nail cap may be located on the side of the first hole segment away from the interior of the case; and a sealer, disposed between the nail cap and the end cover assembly, for sealing the first hole segment.