Battery Stack Connection Breakoff Under Gas Venting
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Solution Overview
Problem
The discharge of gas from power storage stacks can lead to the spread of debris, potentially causing a short-circuit between the total positive and negative terminals, resulting in heat generation across the power storage module.
Innovation Solution
A power storage device with an expansible region in the housing case and a fragile electrical connection member that breaks when gas is discharged, interrupting the electrical connection between stacks and preventing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power storage stacks are electrically connected in series to increase total potential, then power output is improved, but the risk of short-circuit and heat generation increases when gas is discharged
Solution Approach 1:
The electrical connection member is designed with a fragile portion that can dynamically change its state from connected to disconnected. When gas discharge causes expansion pressure, the fragile portion breaks, automatically disconnecting the electrical connection between power storage stacks to prevent short-circuit and heat generation, thus maintaining system reliability while preserving power output capability.
2Ease of operation
If a hollow member with through holes is used for gas exhaust, then gas discharge function is improved, but debris can spread and cause short-circuit between terminals
Solution Approach 1:
The harmful effect of debris spread is addressed by extracting the electrical connection function from the gas exhaust structure. The electrical connection member is separately positioned and designed with a fragile portion that breaks upon gas discharge, removing the risk of debris causing short-circuit while maintaining the gas discharge function of the hollow member.
3Reliability
If the electrical connection member is fixed rigidly to maintain stable connection, then electrical connectivity is improved, but the connection cannot be interrupted when gas is discharged
Solution Approach 1:
The electrical connection member incorporates a fragile portion that enables dynamic response to gas discharge conditions. During normal operation, the connection remains stable and rigid for reliable electrical connectivity. When gas is discharged and expansion pressure occurs, the fragile portion breaks, allowing the connection to be interrupted and preventing heat generation, thus achieving both reliability and adaptability.
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 solution effectively suppresses heat generation by breaking the electrical connection upon gas discharge, preventing short-circuits and maintaining stack integrity.
Implementation Method 1
when gas is discharged from the first power storage stack or the second power storage stack, the expansible region of the housing case expands
Data Source
AI summary
The power storage device includes a first power storage stack and a second power storage stack, a housing case that houses the first power storage stack and the second power storage stack, and an electrical connection member that electrically connects the first power storage stack and the second power storage stack, wherein the housing case includes an expansible region that is inflatable and deformable when gas is discharged from the first power storage stack or the second power storage stack, and the electrical connection member has a fragile portion and is fixed to the expansible region.