Battery Cap-Up Notch Venting for Controlled Pressure Release
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Solution Overview
Problem
Secondary batteries face safety risks due to increased pressure and temperature caused by gas generation during abnormal conditions, leading to potential ignition and performance deterioration.
Innovation Solution
A secondary battery design featuring a cap-up with notches in the base plate, terminal part, or connection part that rupture at a set pressure to facilitate controlled gas emission, enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the battery is sealed without a safety vent, then the structural integrity and sealing are improved, but the safety risk due to pressure buildup is worsened
Solution Approach 1:
A notch is pre-formed in the cap-up structure at a location designed to rupture at a specific pressure threshold. This preliminary structural feature ensures that when abnormal pressure builds up inside the battery, the cap-up will rupture at the predetermined notch location, providing automatic pressure relief without requiring additional safety vent components.
2Object-affected harmful factors
If a safety vent is added to the battery, then the pressure relief capability is improved, but the device complexity is worsened
Solution Approach 1:
The safety vent function is merged into the cap-up structure itself by forming a notch directly in the cap-up material. This integration eliminates the need for separate safety vent components, reducing structural complexity while maintaining pressure relief capability. The cap-up serves dual purposes: sealing the battery and providing pressure relief through the embedded notch.
3Object-affected harmful factors
If the cap-up thickness is reduced to facilitate notch rupture, then the gas emission capability is improved, but the mechanical strength is worsened
Solution Approach 1:
The cap-up structure employs non-uniform thickness distribution, with the majority of the cap-up maintaining sufficient thickness for mechanical strength and sealing, while a localized region at the notch position has reduced thickness to facilitate rupture at the predetermined pressure threshold. This local thinning creates a weak point that preferentially fails under pressure, enabling gas emission without compromising the overall structural integrity of the cap-up.
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 notched cap-up structure effectively manages internal pressure by allowing controlled gas discharge, preventing explosions and improving battery stability and performance.
Implementation Method 1
a notch is provided in at least one of the base plate, the terminal part, and the connection part so as to be ruptured at a set pressure within the can
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a secondary battery including an electrode assembly, in which a notch is provided in a cap-up so that the cap-up is ruptured at a set internal pressure so a gas inside the battery is easily discharged to improve stability of the battery, preventing chain rupture or explosion. The secondary battery includes an electrode assembly, a can configured to accommodate the electrode assembly, and a cap assembly configured to seal an upper portion of the can and having a cap-up comprising a base plate, a terminal part protruding upwardly from an upper side of the base plate and disposed at a center of the cap-up, and a connection part configured to connect the base plate to the terminal part. A notch is provided in at least one of the base plate, the terminal part, or the connection part to be ruptured at a set pressure within the can.