Battery Case Connector Venting for Thermal Runaway Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries can generate high-temperature gas or dust, which affects neighboring cells and degrades stability, leading to potential fires and reduced reliability.
Innovation Solution
A battery case with a connector that disconnects from the battery cell when internal pressure increases, and a venting path to discharge gases externally, ensuring electrical disconnection and gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connector maintains electrical connection to the battery cell, then electrical functionality is preserved, but fire risk increases during high-pressure events
Solution Approach 1:
The connector is designed with movable components that can dynamically change their electrical connection state in response to pressure changes. The contact pin can move between connected and disconnected positions, allowing the system to adapt its electrical connectivity based on thermal runaway conditions.
Solution Approach 2:
The connector automatically detects and responds to high-pressure conditions through its own structural design. The movable contact pin is pushed by the expanding battery cell, causing automatic disconnection without requiring external sensing or control systems.
2Reliability
If the connector remains fixed and connected, then electrical connectivity is maintained, but gas accumulation increases internal pressure
Solution Approach 1:
The movable contact pin serves as an intermediary mechanism between the battery cell and the external electrical circuit. It mediates the pressure relief function by using the expanding gas pressure to drive its movement, which simultaneously achieves both pressure equalization and electrical disconnection.
3Reliability
If the connector is designed to move outward for disconnection, then fire risk is reduced, but manufacturing complexity increases
Solution Approach 1:
The connector combines multiple functions into a single integrated structure: electrical connection, pressure sensing, and automatic disconnection. The movable contact pin integrates the sensing and actuation functions, eliminating the need for separate sensors and actuators that would increase manufacturing complexity.
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
Enhances stability and reliability by preventing electrical connections from maintaining during high pressure events, reducing fire risk and damage by discharging gases.
Implementation Method 1
when the internal pressure of the case body increases
Implementation Method 2
a venting path formed in the case body, discharging gases generated in the case body to an outside
Data Source
AI summary
A battery case according to embodiments of the present disclosure includes a case body including a receiving space in which a battery cell is arranged, and a connector formed on one surface of the case body and electrically connecting the battery cell arranged therein to an external device, wherein the connector is configured to be electrically disconnected from the battery cell when the internal pressure of the case body increases.