Battery Cell Gas Sensing for Formation and Thermal Runaway Detection

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Solution Overview

Problem

Existing battery cell monitoring systems fail to effectively detect and manage gases generated during the formation and intended use of battery cells, leading to potential safety issues such as thermal runaway and overcharging events.

Innovation Solution

A battery cell monitoring system with integrated gas sensors and a gas monitoring circuit that detects levels of gases like CO, CO2, H2, C2H4, and CH4, and communicates with a network device to identify issues, isolate faulty cells, and control formation processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If battery cells are monitored during formation and use, then safety issues such as thermal runaway and overcharging can be detected early, but the device complexity increases due to integrated gas sensors and monitoring circuits

Engineering Contradiction:

Improvesafety detection capabilityVSAvoidmonitoring system structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates gas sensors, monitoring circuits, memory, and transceiver components into a single unified monitoring system within the battery cell case. This merging of multiple functional components into one integrated system enables comprehensive safety monitoring (detecting gases like CO, CO2, H2, C2H4, and CH4) while reducing the overall device complexity compared to having separate monitoring systems.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The monitoring system performs multiple functions simultaneously: it detects various gases (CO, CO2, H2, C2H4, CH4), monitors battery formation processes, detects thermal runaway events, tracks overcharging conditions, and communicates with external devices. This multi-functionality allows a single system to address multiple safety concerns without requiring separate specialized systems for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If gas sensors are integrated within the battery cell case, then real-time gas level monitoring is enabled, but the volume of the battery cell increases

Engineering Contradiction:

Improvegas level detection accuracyVSAvoidbattery cell volume

Core Design Contradiction:

Measurement precisionVSVolume of stationary object

Solution Approach 1:

The monitoring system with gas sensors is nested within the existing battery cell case structure. The gas sensors, monitoring circuits, memory, and transceiver are all housed inside the battery cell case, utilizing the available internal space efficiently. This nesting approach enables real-time gas level monitoring without significantly increasing the overall battery cell volume.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Measurement precision

If multiple gas sensors are connected in series and parallel configurations, then measurement precision for different gases improves, but the device complexity increases

Engineering Contradiction:

Improvegas composition detection accuracyVSAvoidsensor connection structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Different gas sensors are strategically positioned and connected in specific series-parallel configurations to detect particular gases of interest (CO, CO2, H2, C2H4, CH4). Each sensor or sensor group is optimized for detecting specific gas compositions, allowing the system to monitor different aspects of battery health with targeted precision rather than using a uniform sensor arrangement.

Inventive Principle:

Principle #3Local quality

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 real-time monitoring and management of gas levels, allowing for optimal formation times and early detection of anomalies, preventing safety hazards and improving battery performance.

Implementation Method 1

one or more gas sensors disposed within, attached to or connected to the case and configured to detect levels of one or more gases within the case

Methodology Applied

Scientific EffectGas detection:

Data Source

PatentUS12469893B2In-situ gas detection and monitoring of battery cells during formation and intended use

Publication Date: 2025.11.11 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A battery cell monitoring system includes: a battery cell including an electrode stack disposed within a case; a gas sensor disposed within, attached to or connected to the case and configured to detect levels of one or more gases within the case; and a gas monitoring circuit connected to the gas sensor. The gas monitoring circuit includes: a memory that stores data collected from the gas sensor; a transceiver configured to transfer the data to a network device separate from the battery cell; and a control module that monitors the levels of one or more gases and based on the levels of the one or more gases detects (i) an issue with the battery cell during operative use of the battery cell, (ii) an issue with the battery cell during formation of the battery cell, or (iii) completion of a formation operation of the battery cell.