Pouch Battery Pressure-Triggered Circuit Cut-Off for Gas Ejection Risk
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Solution Overview
Problem
Pouch batteries, despite not exploding, pose safety hazards due to gas ejection from damaged pouches, which can power connected devices, posing a risk if not addressed.
Innovation Solution
Incorporating a safety protection device that includes a circuit cut-off mechanism triggered by gas pressure changes within the pouch, such as a circuit breaker or actuator, to interrupt the electrical connection and provide alerts when predetermined pressure is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a pouch battery is used instead of a steel-case or aluminum-case battery, then the battery achieves light weight, compact dimension, flexible design, and arbitrary shape variation, but the battery lacks protection from a hard case which can cause gas ejection from damaged pouches and pose safety hazards
Solution Approach 1:
The battery is divided into functional segments: the pouch containing electrode materials and electrolyte, tabs for electrical connection, and an integrated safety protection device. This segmentation allows the lightweight pouch structure to maintain safety through the dedicated protection mechanism rather than relying on a heavy hard case.
Solution Approach 2:
A safety protection device acts as an intermediary between the pouch battery and external devices. This intermediary monitors the battery state and interrupts electrical connection when abnormal conditions are detected, preventing gas ejection and safety hazards without requiring a hard case.
2Adaptability or versatility
If the pouch battery is made with plastic-aluminum composite film for flexibility and light weight, then the battery can crack instead of explode under safety issues, but the damaged pouch may eject expanded gas and continue powering devices posing safety hazards
Solution Approach 1:
The safety protection device performs preliminary anti-action by monitoring battery conditions and preemptively interrupting electrical connection when abnormal expansion or gas generation is detected. This prevents the harmful effects of gas ejection and continuous power output before they can occur.
Solution Approach 2:
The safety protection device implements feedback by continuously monitoring battery parameters (such as gas pressure or expansion) and automatically responding by cutting off electrical connection when predetermined thresholds are exceeded, thereby preventing gas ejection and continuous operation under abnormal conditions.
3Reliability
If a circuit breaker or actuator is integrated into the pouch battery for safety protection, then the battery can automatically cut off electrical connection under abnormal conditions, but the device complexity increases
Solution Approach 1:
The safety protection device is merged with the battery's internal structure, integrating the circuit breaker or actuator within the pouch rather than as a separate external component. This combining approach enables safety protection while minimizing additional complexity by sharing space and structural elements with the battery's existing components.
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
Ensures safe operation by automatically disconnecting the internal circuit and providing user alerts, preventing power delivery under abnormal conditions without requiring external components, thus enhancing pouch battery safety.
Implementation Method 1
when the gas pressure in the pouch reaches a predetermined value due to the gas expansion
Implementation Method 2
a pressure sensor; a controller connected to the pressure sensor
Data Source
AI summary
A pouch battery contains a pouch, an electrode material and a safety protection device. The electrode material is located in the pouch. The safety protection device is configured to generate an action based on a change in gas pressure within the pouch. In this way, even if the pouch battery is abnormal, its internal circuit can be cut off in time to avoid providing power to external devices while being under abnormal conditions.