Battery Cell Vent Channel Support for Thermal Runaway Relief
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Solution Overview
Problem
The reliability of battery cells is compromised due to the blocking of discharge channels during thermal runaway, which hinders the rapid discharge of high-temperature and high-pressure substances, leading to potential failures and reduced performance.
Innovation Solution
A battery cell design incorporating a supporting member within an insulating member to restrict deformation of discharge channels, ensuring the pressure relief mechanism remains unobstructed and functional during thermal events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cell uses a pressure relief mechanism to discharge high-temperature and high-pressure substances, then the safety performance is improved, but the discharge channel may be blocked by the electrode assembly during thermal runaway, reducing the reliability
Solution Approach 1:
The patent introduces an insulating member as an intermediary component between the electrode assembly and the pressure relief mechanism. This insulating member includes a discharge channel that provides a dedicated pathway for high-temperature and high-pressure substances to reach the pressure relief mechanism, preventing the electrode assembly from directly blocking the discharge path during thermal runaway events
Solution Approach 2:
The patent segments the battery cell structure into distinct functional zones: the electrode assembly area, the insulating member with discharge channel, and the pressure relief mechanism. This segmentation allows the discharge channel to be isolated from the electrode assembly, ensuring that thermal runaway substances can travel through the dedicated channel without being blocked by electrode movement or deformation
2Reliability
If the battery cell allows free movement of the electrode assembly, then the manufacturing simplicity is improved, but the discharge channel deforms under thermal runaway conditions, reducing the reliability
Solution Approach 1:
The insulating member serves as a mediator that structurally separates the electrode assembly from the discharge channel. This intermediary structure allows the electrode assembly to move freely during manufacturing and operation while the discharge channel maintains its structural integrity through the supporting member, preventing deformation during thermal runaway
Solution Approach 2:
The patent applies local quality by providing structural support specifically at the discharge channel region through the supporting member, while allowing other parts of the battery cell to remain flexible. The supporting member is strategically positioned to maintain discharge channel geometry only where needed, without adding unnecessary complexity to the overall cell structure
Data Source
AI summary
Provided are a battery cell, a battery, and an electrical device. The reliability of the battery cell can be improved. The battery cell comprises: a shell, where the shell has a first wall, and the first wall is provided with a pressure relief mechanism; an electrode assembly, where the electrode assembly is accommodated in the shell; an insulating member, where the insulating member is arranged between the electrode assembly and the first wall, the insulating member has an accommodating cavity, and the insulating member has a discharge channel in communication with the pressure relief mechanism and the electrode assembly; and a supporting member, where the supporting member is accommodated in the accommodating cavity for restricting a deformation of the discharge channel.