Battery Cell Pressure Relief Grooves for Faster Vent Opening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery cells have a low pressure relief rate during thermal runaway, leading to a risk of fire and explosion due to untimely pressure release, which compromises their reliability and safety.
Innovation Solution
A battery cell design featuring a pressure relief component with strategically arranged first and second grooves that facilitate controlled pressure relief by allowing the predetermined pressure relief region to flip open, increasing the pressure relief area and reducing the risk of untimely pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single groove structure is used for pressure relief, then the structure is simple and easy to manufacture, but the pressure relief rate is low and the pressure relief area is insufficient
Solution Approach 1:
The pressure relief component is divided into multiple functional grooves: a first groove that defines a predetermined pressure relief region and a second groove that guides the flipping motion. This segmentation allows each groove to perform a specific function, thereby increasing the pressure relief rate while maintaining manufacturing feasibility through standardized groove formation processes.
Solution Approach 2:
The patent introduces a flipping dimension by configuring the pressure relief region to rotate or flip open during pressure relief. The second groove acts as a hinge axis, enabling the pressure relief region to move from a flat closed state to an open state, thereby dramatically increasing the effective pressure relief area without adding complex mechanical components.
2Area of stationary object
If the first groove and second groove are arranged close together, then the structure is compact, but the second groove may be torn when the first groove ruptures
Solution Approach 1:
The patent optimizes the local spatial relationship between the first and second grooves by arranging them in a specific configuration where the second groove is positioned adjacent to but not overlapping with the first groove's rupture path. This local quality adjustment ensures that the second groove maintains its structural integrity as a guiding hinge while the first groove ruptures to open the pressure relief region.
3Reliability
If the pressure relief region flips open completely, then the pressure relief area is maximized, but the shell structural strength may be compromised
Solution Approach 1:
The patent pre-configures the pressure relief region with a predetermined shape and positioning before thermal runaway occurs. The region is designed with specific geometric features that enable controlled flipping motion along the second groove axis. This preliminary configuration ensures that when pressure relief is needed, the region can rapidly flip open to maximize pressure relief area while the overall shell structure maintains its strength through the controlled nature of the flipping mechanism.
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus. The battery cell includes a shell and a pressure relief component. The shell includes a first wall. The pressure relief component is disposed on the first wall and provided with a first groove defining at least one predetermined pressure relief region, and the pressure relief component is configured to be capable of rupturing along at least part of the first groove during pressure relief of the battery cell. The pressure relief component is further provided with a second groove which is arranged in first direction perpendicular to a thickness direction of the first wall with the first groove, located on one side of the first groove in the first direction, and configured to guide at least part of the predetermined pressure relief region to flip over to open at least part of the predetermined pressure relief region.