Battery Fire-Extinguishing Pipe Restraint Against Vent Blow-Off
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Solution Overview
Problem
Existing battery designs face safety issues due to untimely fire extinguishing during thermal runaway, primarily because the fire-extinguishing pipe is not securely fastened and can be blown off when the pressure relief mechanism is actuated.
Innovation Solution
A fire-extinguishing pipe is fastened to a restraining member via a fastener, which includes limiting structures to prevent the pipe from being blown off, ensuring timely fire extinguishing by maintaining its position during thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fire-extinguishing pipe is not securely fastened, then the structure is simple and easy to install, but the pipe can be blown off when the pressure relief mechanism is actuated, causing untimely fire extinguishing
Solution Approach 1:
The fastening structure is divided into multiple components: a fastening plate, limiting structures (limiting plates or limiting blocks), and fastening members (bolts or rivets). This segmentation allows each component to perform its specific function - the fastening plate provides mounting surface, the limiting structures prevent pipe displacement, and the fastening members secure the assembly - while collectively ensuring reliable fire extinguishing without excessive overall complexity
Solution Approach 2:
The limiting structures are pre-installed on the fastening plate before the pressure relief mechanism is actuated. These limiting structures protrude toward the battery cell and are positioned to limit the displacement of the fire-extinguishing pipe in advance. When thermal runaway occurs and the pressure relief mechanism activates, the pipe is already constrained and cannot be blown off, ensuring timely fire extinguishing
2Stability of the object's composition
If the fire-extinguishing pipe is securely fastened with limiting structures, then the pipe position is maintained during thermal runaway, but the fastening structure becomes more complex
Solution Approach 1:
The limiting function is extracted as a separate structural element (limiting plates or limiting blocks) that protrude from the fastening plate toward the battery cell. This extraction allows the limiting structures to independently perform the displacement limitation function without complicating the overall fastening mechanism, as they can be simple protruding features rather than complex mechanical constraints
Solution Approach 2:
The fastening plate serves as an intermediary component between the battery cell and the fire-extinguishing pipe. It provides a mounting surface for the pipe while incorporating limiting structures that act as mediators to prevent pipe displacement during thermal runaway. The fastening members then secure this intermediary assembly, creating a stable configuration without requiring direct complex constraints on the pipe itself
Data Source
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AI summary
Embodiments of the present application provide a battery (10), an electric device, and a method and device for preparing the battery (10). The battery (10) comprises: a plurality of battery cells (20) arranged in a first direction (X), the battery cells (20) being provided with pressure relief mechanisms (213), and the pressure relief mechanisms (213) being used for actuating, when the internal pressure or temperature of the battery cells (20) reaches a threshold, to discharge the internal pressure; a fire-fighting pipeline (13) for accommodating a fire-fighting medium, the fire-fighting pipeline (13) being configured to discharge the fire-fighting medium when the pressure relief mechanisms (213) actuate; restraining members (14) provided at the end portions of the plurality of battery cells (20) arranged in the first direction (X), the restraining member (14) being used for restraining the plurality of battery cells (20) in the first direction (X); and fixing members (15) connected to the surfaces of the restraining members (14) facing the fire-fighting pipeline (13), the fixing members (15) being used for fixing the fire-fighting pipeline (13). The battery (10), the electric device, and the method and device for preparing the battery (10) in the embodiments of the present application can improve the safety performance of the battery (10).