Battery Cell Injection Port for Vacuum Electrolyte Filling

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Solution Overview

Problem

Conventional battery cell manufacturing is hindered by complex and costly facilities required for electrolyte injection and sealing, limiting productivity and flexibility in managing electrolyte injection and gas removal.

Innovation Solution

A battery cell design featuring an electrolyte injection hole with a detachable cap and an electrolyte injecting device that allows for easy injection and removal of electrolyte in a vacuum state, using a screw-thread mechanism for secure attachment and anti-slip grooves for user convenience.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolyte injection facilities are used, then electrolyte can be injected into vacuum chamber, but manufacturing cost increases and productivity decreases due to complicated facilities

Engineering Contradiction:

Improveelectrolyte injection capabilityVSAvoidfacility complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The battery case is segmented to include a separate injection hole portion that can be detached or opened independently from the main battery case body. This allows electrolyte injection without requiring complex vacuum chamber facilities, as the injection can be performed through the separate injection hole portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The injection hole portion is extracted as a separate functional element from the battery case. This extracted portion includes the injection hole and associated sealing structures, allowing it to be handled independently during electrolyte injection while simplifying the overall manufacturing process.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If battery case is sealed in vacuum chamber, then electrolyte injection is possible, but manufacturing cost increases and productivity decreases

Engineering Contradiction:

Improvevacuum sealing capabilityVSAvoidmanufacturing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The battery case is divided into a main body and a separate injection hole portion. The injection hole portion can be opened or detached to allow electrolyte injection without requiring the entire battery case to be sealed in a vacuum chamber, thereby improving manufacturing efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The injection hole portion includes integrated sealing structures (such as sealing ribs and sealing grooves) that enable self-sealing after electrolyte injection. This eliminates the need for external vacuum chamber facilities, allowing the battery case to perform its own sealing function and improving productivity.

Inventive Principle:

Principle #25Self-service

3Reliability

If battery case is cut and sealed again in vacuum state, then gaseous products can be removed, but manufacturing cost increases

Engineering Contradiction:

Improvegas removal capabilityVSAvoidvacuum processing facilities

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The battery case is segmented with a separate injection hole portion that can be opened to remove gaseous products. This segmented design allows gas removal without requiring the battery case to be cut and resealed in a vacuum chamber, simplifying the manufacturing process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The injection hole portion is designed to be opened before final sealing, allowing gaseous products to be removed in advance. This preliminary action eliminates the need for subsequent vacuum processing facilities, reducing manufacturing complexity.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If battery case is completely sealed, then manufacturing is complete, but additional electrolyte injection or gas removal becomes impossible

Engineering Contradiction:

Improvesealing integrityVSAvoidfuture maintenance flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The battery case is segmented with a separate injection hole portion that can be opened independently from the main battery case body. This segmentation maintains sealing integrity of the main case while providing access for future electrolyte injection or gas removal operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The injection hole portion is designed with dynamic characteristics, allowing it to be opened when needed and sealed when not in use. This dynamic design provides flexibility for future maintenance operations while maintaining sealing integrity during normal operation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3349272B1Battery cell and method for manufacturing battery cell

Publication Date: 2024.09.11 LG ENERGY SOLUTION LTD

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AI summary

Disclosed is a battery cell, which includes an electrode assembly, a pair of electrode leads electrically connected to the electrode assembly, a battery case configured to accommodate the electrode assembly and expose a portion of the pair of electrode leads to the outside, an electrolyte injection hole formed in the battery case and connectable to an electrolyte injecting device that injects an electrolyte in a vacuum state so that the electrolyte is injected into the battery case, and an injection hole cap configured to cover the electrolyte injection hole and mounted to the electrolyte injection hole so as to be detachable from the electrolyte injection hole by user manipulation.