Battery Cell Pressure Relief Groove Structure for Faster Venting
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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, compromising their reliability.
Innovation Solution
The battery cell incorporates a pressure relief component with a first groove and a second groove arranged in a specific direction, allowing the pressure relief component to rupture and 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 score groove is disposed on the shell to enable pressure relief through rupture, then the battery cell can release internal pressure during thermal runaway, but the pressure relief rate is low resulting in delayed pressure relief and increased risk of fire and explosion
Solution Approach 1:
The pressure relief component is divided into multiple segments through the first groove and second groove, allowing the structure to rupture and flip open in a controlled manner. The first groove defines a pressure relief region that can flip open around the second groove, creating multiple opening paths for pressure release.
Solution Approach 2:
The pressure relief component transitions from a closed state to an open state through a flipping motion enabled by the groove structure. The second groove acts as a hinge axis, allowing the pressure relief region to dynamically open up when pressure builds up, significantly increasing the pressure relief area and rate.
2Ease of manufacture
If the first groove and second groove are arranged in contact or at intervals in the first direction, then processing is facilitated and interference between grooves is reduced, but the structural complexity increases
Solution Approach 1:
The groove structure extends into the thickness direction of the first wall, creating a three-dimensional flipping mechanism. The second groove penetrates through the thickness direction to form an axis around which the pressure relief region can flip, adding a rotational dimension to the pressure relief process.
Data Source
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AI summary
The present application belongs to the technical field of batteries, and provides a battery cell, a battery, and an electrical apparatus. The battery cell comprises a casing and a pressure relief component. The casing comprises a first wall. The pressure relief component is disposed on the first wall, the pressure relief component is provided with a first groove, the first groove defines at least one predetermined pressure relief region, and the pressure relief component is configured to be capable of cracking along at least part of the first groove when pressure is relieved from the battery cell. The pressure relief component is further provided with a second groove, the second groove and the first groove are arranged in a first direction, the second groove is located on a side of the first groove in the first direction, the first direction is perpendicular to the thickness direction of the first wall, and the second groove is configured to guide at least part of the predetermined pressure relief region to invert so as to open at least part of the predetermined pressure relief region. According to such a battery cell, the effect of inverting around the second groove after the predetermined pressure relief region is opened can be improved, so that the angle of inversion of the predetermined pressure relief region is increased, which is beneficial for increasing the pressure relief area of the battery cell.