Battery Case Venting With Fixed Lid for Higher Gas Discharge
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Solution Overview
Problem
The existing battery case designs, such as those disclosed in Patent Literature 1, face challenges in securing an adequate gas discharge flow rate due to the lid member moving outward with the wall plates, resulting in a small gap and insufficient gas release when internal pressure exceeds external air pressure.
Innovation Solution
A battery case with a gas discharge mechanism featuring a gas discharge port on the wall plates and a fixed lid part that covers the port from inside, allowing the wall plate to swell outward and create a larger gap for gas discharge without the lid part moving, ensuring a sufficient flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lid member is attached integrally to the wall plate so that it moves outward together with the wall plates when pressure increases, then the structure is simple and integrated, but the gap generated is small (equal to the deformation amount of the wall plates) and insufficient gas discharge flow rate is achieved
Solution Approach 1:
The gas discharge mechanism is segmented into two independent components: the wall plate and the lid part. The lid part is separated from the wall plate and fixed to the housing, while the wall plate remains movable. This segmentation allows the wall plate to deform outward independently to create a large gap for gas discharge, while the lid part remains stationary to maintain structural integrity. The segmentation resolves the contradiction by enabling both simple structure and high gas discharge flow rate.
Solution Approach 2:
Different parts of the system are given different properties: the wall plate is designed to be deformable and movable to create the gas discharge gap, while the lid part is designed to be fixed and stationary to provide a stable reference point. This local differentiation of properties allows the system to achieve both structural simplicity and effective gas discharge functionality.
2Duration of action of moving object
If the lid member moves outward together with the wall plates during pressure increase, then the wall plate deformation can be utilized, but the relative movement between lid and wall plate is limited resulting in small gap formation
Solution Approach 1:
Instead of allowing both the wall plate and lid to move outward together (conventional approach), the invention inverts the approach by fixing the lid part to the housing and allowing only the wall plate to move. This inversion creates maximum relative movement between the lid and wall plate, resulting in a large gap for gas discharge while still utilizing the wall plate's deformation capability.
3Productivity
If the lid part is fixed to the housing while the wall plate swells outward, then a large facing gap can be formed for sufficient gas discharge, but the lid part must be securely anchored to the housing
Solution Approach 1:
The lid part is merged with the housing structure through secure fixation, creating a unified stationary component. This merging allows the lid part to serve as a stable anchor point while the wall plate moves, enabling large gap formation for gas discharge. The fixation method integrates the lid part into the housing structure, balancing the ease of manufacture with the requirement for secure anchoring.
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
This configuration ensures a higher gas discharge flow rate by maintaining the lid part fixed and allowing the wall plate to deform outward, effectively managing pressure differences and preventing external ignition risks.
Implementation Method 1
the at least one wall plate to separate from the lid part by outward swelling deformation of the at least one wall plate in accordance with increase of internal pressure of the battery case
Data Source
AI summary
When the pressure in the battery case is increased, the gas discharge flow rate is secured sufficiently. This battery case (30) is a battery case in which a battery (2) is housed in a housing (10). The battery case (30) includes a gas discharge mechanism (G). The gas discharge mechanism (G) includes a gas discharge port (51) that opens in a wall plate (43) that covers a periphery of the housing (10), and a lid part (35m). The lid part (35m) is disposed to cover the gas discharge port (51) from inside the wall plate (43), and is fixed on the housing (10) side.