Battery Cell Electrolyte Wetting Layout to Prevent Air Bubble Trapping

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Solution Overview

Problem

Existing methods for wetting battery cell wicks are inefficient and can trap air bubbles, slowing the wetting process.

Innovation Solution

A system and method involving a battery cell with an electrolyte inlet opening and an air hole, oriented to face opposite and perpendicular to the gravitational direction, respectively, and a sump housing to feed electrolyte efficiently into the cell housing, ensuring the wick is fully wetted without air bubble trapping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If electrolyte is fed into the battery cell using existing methods, then the wick will be wetted, but air bubbles are trapped and the wetting process is slowed down

Engineering Contradiction:

Improvewetting speedVSAvoidair bubble trapping

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent inverts the traditional wetting approach by positioning the air hole at the bottom of the cell and the electrolyte inlet at the top. This inversion allows air to escape naturally from the bottom while electrolyte flows down from the top, preventing air bubble trapping and significantly improving wetting speed and reliability

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the battery cell is oriented with the electrolyte inlet facing upward, then air can vent easily, but the wick may not be fully wetted

Engineering Contradiction:

Improveair ventingVSAvoidwetting completeness

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent inverts the orientation by placing the air hole at the bottom and electrolyte inlet at the top, allowing both air venting and complete wick wetting to occur simultaneously through the inverted flow path

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If existing wetting methods are used, then the process is simple, but the wetting efficiency is low and time-consuming

Engineering Contradiction:

Improvewetting efficiencyVSAvoidwetting time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The inverted configuration with air hole at bottom and electrolyte inlet at top creates a highly efficient wetting process that reduces both time and resource consumption while improving overall effectiveness

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The system uses gravity and natural air displacement to drive the wetting process without requiring external assistance or complex mechanisms, achieving self-service wetting that is both fast and efficient

Inventive Principle:

Principle #25Self-service

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 method enhances the efficiency of wetting the battery cell wick by preventing air bubble formation, ensuring complete wetting and optimizing the electrolyte distribution.

Implementation Method 1

a wick of the stack formed at least in part by the anode active material and the cathode active material

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

an air hole formed on the side wall... venting from the air hole air released from the wick when displaced by the electrolyte

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Data Source

PatentUS20250260148A1Battery cell electrolyte wetting system and method

Publication Date: 2025.08.14 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A system includes a battery cell having a cell housing having at least a wall and a side wall, an electrolyte inlet opening formed on the wall, and an air hole formed on the side wall, and a sump including a sump housing configured to hold electrolyte therein. The electrolyte inlet opening is fluidly coupled to the sump housing to allow for the electrolyte to be fed from the sump housing into the cell housing.