Battery Module Insulation Inspection via Conductive Rivet
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Solution Overview
Problem
Conventional battery modules with metal casings face challenges in insulation inspection due to surface coatings, which hinder the detection of potential contact-induced current flow and voltage reduction, while enhancing casing strength with metal materials complicates downsizing and increases volume.
Innovation Solution
A battery module configuration featuring a metal casing with a conductive portion, such as a rivet, and an insulation layer allows for easy insulation inspection by exposing the conductive portion on the surface, enabling electrical conduction and detection without increasing operational steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal material is used for the casing to enhance strength, then the strength is improved, but the volume occupied by the casing is increased
Solution Approach 1:
The patent applies local quality by providing insulation layers at specific locations where electrical insulation is needed (between the metal casing and battery cells), rather than insulating the entire casing. This allows the casing to maintain its metal structure for strength while minimizing the volume added by insulation materials only where necessary for electrical isolation.
2Reliability
If the surface of the metal casing is subject to coating for rust prevention, then the rust resistance is improved, but the insulation inspection difficulty is increased
Solution Approach 1:
The patent segments the casing surface into two functional zones: a coated area for rust prevention and an uncoated conductive portion for insulation inspection. The conductive portion is intentionally left without coating to enable electrical contact for inspection purposes, while the rest of the surface maintains protective coating. This segmentation resolves the contradiction by assigning different surface treatments to different functional requirements.
Solution Approach 2:
The conductive portion acts as an intermediary element that enables insulation inspection without compromising the overall rust protection. By providing a dedicated uncoated area, the system allows inspection personnel to perform electrical continuity tests to detect insulation failures, thus mediating between the need for rust protection and the need for inspectability.
3Ease of operation
If the conductive portion is provided on the casing for insulation inspection, then the insulation inspection ease is improved, but the device complexity is increased
Solution Approach 1:
The conductive portion serves multiple functions: it enables insulation inspection through electrical contact, maintains structural integrity of the casing, and can serve as a mounting point for insulation sheets. By integrating these functions into a single feature, the patent avoids adding separate inspection components, thus improving inspection ease without proportionally increasing device 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
This configuration facilitates straightforward insulation inspection without altering the casing's structure, ensuring reliable detection of insulation integrity and maintaining the module's strength and compactness.
Implementation Method 1
a casing made of metal and provided on its outer surface with an insulation layer
Implementation Method 2
a conductive portion, and wherein the conductive portion is a rivet which is fixed to the casing so as to penetrate the casing and the insulation layer
Data Source
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AI summary
A battery module includes a metal casing (4) and a battery cell (3) accommodated in the casing (4). The casing (4) is provided on its outer surface with an insulation layer (8) and a conductive portion (11). An insulation inspection can be easily conducted with a simple configuration without increasing the number of operation steps.