Integrated Safety Vent in Secondary Battery Case
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Solution Overview
Problem
Secondary batteries lack integrated safety vents, which can lead to increased manufacturing costs and complexity, and pose safety risks due to the absence of a dedicated mechanism for releasing internal pressure during abnormal operations.
Innovation Solution
A secondary battery design featuring a safety vent integrally formed with the side wall or bottom part of the case, comprising a vent groove and notch groove with specific depth ratios, and rounded or linear edges, to facilitate efficient pressure release while reducing manufacturing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate safety vent component is used, then safety function is provided, but device complexity and manufacturing cost increase
Solution Approach 1:
The safety vent function is merged with the case structure by forming a through-hole directly in the case wall. This eliminates the need for separate safety vent components and reduces assembly steps, while still providing the essential pressure relief function. The case itself becomes both the container and the safety vent mechanism.
2Reliability
If a separate safety vent component is used, then safety function is provided, but manufacturing cost increases
Solution Approach 1:
The safety vent function is merged with the case structure by forming a through-hole directly in the case wall. This eliminates the need for separate safety vent components and assembly operations, reducing manufacturing cost while maintaining the essential pressure relief function.
3Ease of manufacture
If safety vent is integrally formed with case, then manufacturing cost and complexity are reduced, but safety effectiveness may be compromised
Solution Approach 1:
The case wall thickness at the safety vent location is specifically designed to be sufficient to maintain structural integrity under normal operating conditions, while the through-hole provides an unobstructed pressure relief path when needed. This local optimization ensures both safety effectiveness and manufacturing simplicity.
4Reliability
If multiple components are used for safety vent, then safety function is enhanced, but productivity decreases due to additional assembly steps
Solution Approach 1:
The safety vent function is merged with the case structure, eliminating the need for separate components and assembly steps. The through-hole is formed directly in the case wall during case manufacturing, significantly improving productivity while maintaining the safety 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 integrated safety vent enhances safety by allowing for effective pressure relief, simplifies the manufacturing process, and reduces costs by eliminating the need for separate safety vent components, while improving processability and accuracy during production.
Implementation Method 1
a safety vent is integrally formed with an edge part of one region selected from among the side wall parts and the bottom part
Data Source
AI summary
Disclosed in the present invention is a secondary battery having a safety vent integrally formed with a side wall part of a case thereof whereby the secondary battery is improved in safety and has the effect of reducing manufacturing cost and simplifying process. As an example, disclosed is a secondary battery comprising: an electrode assembly; a case for receiving the electrode assembly; and a cap plate for covering an opened opening of the case, wherein the case includes two pairs of side wall parts, the side wall parts in each pair facing each other, and a bottom part perpendicular to the side wall parts, and a safety vent is integrally formed with an edge part of one region selected from the side wall parts and the bottom part.