Battery Cell Weak Region Rupture for Explosion Prevention
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Solution Overview
Problem
Battery cells face an explosion risk due to increased internal pressure and temperature caused by gas generation from electrolyte and active materials, which can lead to deformation and potential failure of the housing.
Innovation Solution
A battery cell design with a weak region on the electrode terminal that ruptures when internal pressure or temperature exceeds thresholds, allowing gas discharge and reducing the risk of explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the weak region is disposed on the housing, then the explosion-proof function is achieved, but the housing is prone to deformation
Solution Approach 1:
The weak region is extracted from the housing and transferred to the electrode terminal. The electrode terminal is provided with a weak region that can rupture under excessive pressure or temperature, achieving the explosion-proof function without compromising the housing's structural integrity and shape stability.
2Shape
If the weak region is disposed on the electrode terminal, then the housing deformation is reduced, but the sensitivity to internal pressure needs to be enhanced
Solution Approach 1:
The electrode terminal is designed with a localized weak region that has different mechanical properties from the rest of the terminal. This weak region, positioned at specific locations such as the insertion portion or first flange portion, is engineered to be highly sensitive to internal pressure changes, allowing it to rupture at predetermined pressure thresholds while the rest of the electrode terminal maintains its structural strength.
3Reliability
If the weak region is disposed on the insertion portion or first flange portion, then the pressure sensitivity is enhanced, but the structural strength may be compromised
Solution Approach 1:
The weak region is pre-designed and pre-positioned on the insertion portion or first flange portion of the electrode terminal during manufacturing. This preliminary design ensures that under normal operating conditions, the electrode terminal maintains sufficient structural strength, while under excessive pressure or temperature conditions, the pre-designed weak region ruptures to provide the explosion-proof function.
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 design effectively reduces the likelihood of explosion by facilitating rapid pressure relief through the electrode terminal's fracture or bending, maintaining structural integrity of the housing.
Implementation Method 1
the weak region is configured to be ruptured when an internal pressure of the housing exceeds a pressure threshold or a temperature exceeds a temperature threshold, allowing the interior of the housing to communicate with the exterior of the housing
Implementation Method 2
the weak region is configured to be ruptured when an internal pressure of the housing exceeds a pressure threshold or a temperature exceeds a temperature threshold
Data Source
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AI summary
This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes a housing and an electrode terminal. The housing includes a wall portion, where the wall portion is provided with an outlet hole. The electrode terminal is disposed at the outlet hole, where the electrode terminal is provided with a weak region, and the weak region is configured to be ruptured when an internal pressure of the housing exceeds a pressure threshold or a temperature exceeds a temperature threshold, allowing interior of the housing to communicate with exterior of the housing. In this way, a risk of explosion of the battery cell can be reduced.