Battery Pack Dual-Valve Venting for Thermal Runaway Pressure Relief
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Solution Overview
Problem
The safety of energy storage systems, particularly during thermal runaway of batteries, is a key concern due to the potential for gas leakage and explosion within the battery pack.
Innovation Solution
An energy storage system design featuring a first and second explosion-proof valve, with a sealing member isolating the space between shells, and a connecting member linking the valves to ensure synchronized opening, thereby preventing pressure buildup and facilitating timely gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single explosion-proof valve is used to release gas from the battery, then the structure is simple, but the pressure cannot be effectively controlled and may cause explosion
Solution Approach 1:
The single explosion-proof valve is segmented into two separate valves: a first explosion-proof valve on the battery and a second explosion-proof valve on the energy storage system. This segmentation divides the pressure relief function into two stages, improving safety while maintaining reasonable structural complexity.
Solution Approach 2:
The sealing member acts as an intermediary between the first and second explosion-proof valves. It creates an isolated inner space that temporarily contains gas from the first valve before releasing it through the second valve, mediating the pressure control process between the two valves.
2Reliability
If the space between first shell and second shell is not isolated from the sealing member inner space, then the structure is simple, but pressure buildup may cause explosion
Solution Approach 1:
The internal space is segmented into three distinct regions: the battery inner space, the sealing member inner space, and the space between shells. The sealing member creates a fluid isolation barrier between these regions, preventing pressure buildup in the space between shells while maintaining structural integrity.
3Reliability
If the second explosion-proof valve opens only by pressure, then the response time is delayed, but the structure is simple
Solution Approach 1:
The connecting member performs a preliminary action by pre-positioning the second explosion-proof valve's valve core in a state ready for immediate opening. When the first valve opens and pressure increases, the connecting member quickly actuates the second valve, reducing the response delay while adding minimal structural 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
The system effectively prevents explosions by isolating fluid spaces and ensuring rapid pressure relief, enhancing safety and thermal insulation, thus improving the overall security of energy storage systems.
Implementation Method 1
a sealing member, arranged between the first shell and the second shell, in which a space between the first shell and the second shell is fluidly isolated from an inner space of the sealing member
Implementation Method 2
a first explosion-proof valve, mounted on the second shell to communicate with an inner space of the second shell and the inner space of the sealing member when the first explosion-proof valve is opened
Implementation Method 3
a second explosion-proof valve, mounted on the first shell to communicate with the inner space of the sealing member and an outer space of the first shell when the second explosion-proof valve is opened
Data Source
AI summary
The present application provides an energy storage system, including a first shell, a battery pack, a sealing member, a first explosion-proof valve and a second explosion-proof valve. The battery pack is arranged inside the first shell and includes a second shell and a battery. The sealing member is arranged between the first shell and the second shell, and a space between the first shell and the second shell is fluidly isolated from an inner space of the sealing member. The first explosion-proof valve is mounted on the second shell to communicate with an inner space of the second shell and the inner space of the sealing member when the first explosion-proof valve is opened. The second explosion-proof valve is mounted on the first shell to communicate with the inner space of the sealing member and an outer space of the first shell when the second explosion-proof valve is opened.