Battery Electrolyte Injection With Weight-Based Fill Adjustment

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Solution Overview

Problem

Existing technologies face challenges in easily and accurately injecting a predetermined amount of electrolyte into secondary battery exterior cases, which affects the performance and stability of the battery.

Innovation Solution

An electrolyte injection system comprising an injector, extractor, measurer, and controller that adjusts the electrolyte amount based on weight measurements to ensure precise injection and extraction, using a syringe-like nozzle and motor parts to manage the electrolyte flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a predetermined amount of electrolyte is injected into the exterior case, then the battery performance and stability are improved, but the complexity of the injection system increases

Engineering Contradiction:

Improvebattery performance and stabilityVSAvoidinjection system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses a weight sensor to measure the actual weight of the exterior case after electrolyte injection, compares it with the target weight, and automatically controls the extractor to remove excess electrolyte or the injector to add more electrolyte to achieve the precise target amount, ensuring battery performance and stability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces complex flow-based measurement systems with a weight-based measurement system using a weight sensor, which directly measures the mass of the electrolyte injected into the exterior case, providing more accurate and reliable control with simpler implementation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If the electrolyte injection amount is precisely controlled, then the manufacturing precision is improved, but the operation complexity increases

Engineering Contradiction:

Improveelectrolyte injection precisionVSAvoidoperation complexity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The system automatically completes the entire electrolyte injection and adjustment process without manual intervention. The weight sensor automatically detects the electrolyte amount, the controller automatically compares with target values, and the extractor or injector automatically adjusts the amount, achieving precise manufacturing while simplifying operation

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The weight sensor serves as an intermediary that objectively measures the electrolyte amount and provides accurate data to the controller, eliminating the need for manual measurement and calculation, thereby improving precision while reducing operational complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If the electrolyte amount is adjusted based on weight measurement, then the measurement precision is improved, but the device complexity increases

Engineering Contradiction:

Improveelectrolyte amount measurementVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex volumetric measurement systems with a straightforward weight-based measurement system using a weight sensor, which directly measures the mass of the electrolyte, providing high measurement precision with a relatively simple device configuration

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The weight sensor serves multiple functions: it measures the weight of the exterior case before injection, measures the weight after injection to calculate electrolyte amount, and provides data for the controller to determine whether extraction or additional injection is needed, reducing the need for separate measurement devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables easy and accurate electrolyte injection, ensuring optimal battery performance and stability by maintaining the correct electrolyte capacity within the exterior case.

Implementation Method 1

a measurer that measures a weight of the exterior case into which the electrolyte is injected

Methodology Applied

Scientific EffectWeight measurement:

Implementation Method 2

a motor part that extracts the electrolyte through the nozzle part

Methodology Applied

Scientific EffectMechanical force: Mechanical Force

Data Source

PatentUS20250219274A1Electrolyte Injection System and Electrolyte Injecting Method Using the Same

Publication Date: 2025.07.03 SK ON CO LTD

AI summary

An electrolyte injection system of the present disclosure includes: an injector configured to inject an electrolyte into an exterior case; an extractor configured to extract a portion of the electrolyte injected into the exterior case; a measurer configured to measure a weight of the exterior case into which the electrolyte is injected; and a controller configured to control the injector and the extractor to adjust an amount of the electrolyte located inside the exterior case based on the weight of the exterior case into which the electrolyte is injected.