Vehicle Battery Housing Sealing for Zero-Gap Electrolyte Protection
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Solution Overview
Problem
Existing battery housings face challenges such as increased assembly errors, reduced energy capacity, complex manufacturing processes, and corrosive infiltration due to electrolyte penetration in the zero-gap area, which are not adequately addressed by current sealing methods.
Innovation Solution
A battery housing design incorporating a liquid seal in the zero-gap area between the housing cover and sealing flange, combined with a circumferential seal, using a fluid-resistant and electrolyte-impermeable sealant to prevent electrolyte penetration and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a molded seal is used in larger battery housings, then sealing effectiveness is improved, but handling difficulty increases and assembly errors rise
Solution Approach 1:
The sealing system is divided into two independent parts: a molded seal for the contact edge and a liquid seal for the zero-gap area. This segmentation allows each seal to be optimized for its specific function and application method, with the liquid seal being easier to apply than handling large molded seals.
Solution Approach 2:
The liquid seal acts as an intermediary element that fills the zero-gap area between housing components. It mediates the sealing function in regions where molded seals are difficult to apply, providing a complementary sealing solution that is easier to handle and apply.
2Reliability
If a sealing cord is used, then sealing is achieved, but the sealing flange size increases reducing battery cell installation space
Solution Approach 1:
Different sealing methods are applied to different locations: the molded seal is applied to the contact edge where structural sealing is needed, while the liquid seal is applied to the zero-gap area where space efficiency is critical. This local differentiation optimizes both sealing effectiveness and space utilization.
3Reliability
If adhesive joints are used for housing seals, then sealing is achieved, but curing time increases extending production time
Solution Approach 1:
The liquid seal replaces adhesive joints by using a liquid-based sealing mechanism that does not require curing time. The liquid seal sets quickly upon application, eliminating the extended curing periods associated with adhesive bonding and thereby reducing production time.
4Reliability
If adhesive seams are used, then sealing is achieved, but process parameter control complexity increases manufacturing costs
Solution Approach 1:
The liquid seal is applied as a simple, quick-setting material that does not require complex process control systems. It replaces expensive adhesive systems that need precise control of temperature, humidity, and surface quality parameters, thereby simplifying the manufacturing process and reducing costs.
5Reliability
If adhesive seams are used, then sealing is achieved, but removability during maintenance is lost
Solution Approach 1:
The liquid seal is designed to be removable during maintenance and repair operations. Unlike permanent adhesive bonds, the liquid seal can be discarded or removed without causing damage to the housing components, enabling easy maintenance and recovery of the sealing system.
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
Ensures a reliable, leak-free, and corrosion-resistant battery housing that reduces manufacturing complexity and assembly errors, maintaining energy capacity and extending the battery's service life.
Implementation Method 1
a liquid seal which prevents penetration of the electrolyte into the zero-gap area
Implementation Method 2
molded seals made of plastic or rubber materials, such as EPDM (ethylene propylene diene rubber), NBR (acrylonitrile or nitrile butadiene rubber), or silicone foam
Data Source
Figure 1~2
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AI summary
The invention relates to a battery housing (4) for a vehicle battery (2), comprising a housing part (6) with a circumferential sealing flange (10), and a housing cover (8) which has a circumferential seal (14) which seals a contact edge (16) formed between the sealing flange (10) and the housing cover (6), wherein a zero-gap area (20) is formed radially outside to the seal (14) between the housing cover (6) and the sealing flange (10), and wherein a liquid seal (22) is introduced into the zero-gap area (20).