Battery Cell One-Way Venting for Stable Internal Pressure
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Solution Overview
Problem
Existing pressure relief mechanisms in battery cells often prematurely activate, leading to poor operational stability and reduced service life and reliability.
Innovation Solution
A battery cell design incorporating a one-way valve on the housing that allows unidirectional discharge of gas, featuring a valve body with a valve core and gas inlet/outlet configuration to manage internal pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief mechanism is provided on the housing to release internal pressure, then safety of the battery cell is improved, but the pressure relief mechanism may prematurely actuate during use, resulting in poor operational stability
Solution Approach 1:
The pressure relief function is segmented into two distinct mechanisms: a one-way valve for normal gas discharge and a pressure relief mechanism for emergency pressure release. This segmentation allows each component to operate independently at different pressure thresholds, preventing premature activation and improving operational stability while maintaining safety.
Solution Approach 2:
The one-way valve is designed with a specific opening pressure parameter that is lower than the activation pressure of the pressure relief mechanism. By changing and differentiating these pressure parameters, the system enables the one-way valve to handle normal gas accumulation while the pressure relief mechanism remains dormant until truly necessary, thus preventing premature actuation.
2Reliability
If internal pressure of the battery cell reaches a threshold prematurely due to rise of internal gas pressure, then safety function is activated, but service life and reliability of the battery cell are reduced
Solution Approach 1:
The one-way valve performs preliminary action by discharging gas during normal operation before internal pressure reaches the dangerous threshold. This preliminary gas discharge prevents the need for premature activation of the pressure relief mechanism, thereby extending the service life of the battery cell while maintaining the safety function.
3Quantity of substance
If gas accumulates inside the housing during normal operation, then internal pressure rises, but this may trigger premature pressure release
Solution Approach 1:
The one-way valve provides continuous feedback control for gas pressure inside the housing. When gas accumulates and pressure rises above the valve's opening threshold, the valve automatically opens to discharge gas, then closes when pressure normalizes. This feedback mechanism maintains internal pressure within acceptable limits without triggering premature pressure release.
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
Enhances operational stability and extends service life by preventing premature pressure release, ensuring reliable battery cell performance.
Implementation Method 1
when the internal pressure of the housing rises, gas inside the housing can act on the valve core and drive the valve core to open the gas inlet
Data Source
AI summary
A battery cell includes a housing, an electrode assembly, and a one-way valve. The housing has a wall portion, the electrode assembly is accommodated within the housing, the one-way valve is disposed on the wall portion, and the one-way valve is configured to discharge gas from inside the housing. Through provision of the one-way valve on the wall portion of the housing, the one-way valve can open unidirectionally to discharge gas inside the housing to the exterior of the housing, allowing gas generated inside the housing during normal operation of the battery cell to be discharged to the exterior of the housing through the one-way valve.