Battery Cell Outer Insulation Support for Pressure Relief
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Solution Overview
Problem
Existing battery cell insulation arrangements are prone to damage from external pressure fluctuations, leading to uncontrolled perforation and loss of electrical insulation due to gaps or cavities formed between the outer insulation and the cell casing.
Innovation Solution
A single-piece outer insulation arrangement with support elements and pressure equalization features, such as support ribs, insert plates, and pressure equalization openings, to prevent tensile stress and maintain electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer insulation covers recesses and openings in the cell housing, then electrical insulation is improved, but cavities form between the insulation and cell housing causing vulnerability to pressure damage
Solution Approach 1:
The support element is pre-installed in the cell housing at the location where the outer insulation will form cavities over recesses. This preliminary placement ensures that when the outer insulation is applied, the support element is already positioned to prevent cavity formation and protect against pressure damage, resolving the contradiction between maintaining electrical insulation coverage and preventing pressure-induced damage.
Solution Approach 2:
The support element acts as an intermediary component between the cell housing and the outer insulation. It mediates the interaction by providing structural support in cavity-prone areas, preventing the outer insulation from being directly subjected to pressure fluctuations while maintaining its electrical insulation function, thus resolving the harm caused by cavity formation.
2Reliability
If the outer insulation is applied over the entire cell housing, then electrical insulation is ensured, but the insulation becomes vulnerable to uncontrolled perforation in cavity areas
Solution Approach 1:
Instead of uniformly reinforcing the entire outer insulation, support elements are strategically placed only in specific locations where cavities form over recesses and openings. This localized reinforcement provides mechanical strength exactly where needed to prevent uncontrolled perforation, while maintaining the overall electrical insulation function without unnecessary additional material or complexity.
Solution Approach 2:
The support elements are pre-positioned in the cell housing before the outer insulation is applied. This preliminary action ensures that when pressure fluctuations occur, the support elements are already in place to prevent uncontrolled perforation, maintaining both the electrical insulation integrity and mechanical strength of the insulation system.
3Reliability
If recesses are covered by outer insulation to ensure electrical insulation, then insulation coverage is improved, but pressure equalization becomes difficult
Solution Approach 1:
The support element serves as a mediator that allows pressure equalization to occur while maintaining insulation coverage. It provides a structured interface between the outer insulation and the cell housing, enabling pressure to be distributed and equalized in the cavity areas without compromising the electrical insulation function or causing uncontrolled deformation of the insulation material.
Data Source
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AI summary
The invention relates to an insulation arrangement for a battery cell with an outer insulation formed in at least one piece, wherein the outer insulation rests at least partially on the outside of a cell housing and electrically insulates the cell housing, wherein at least one recess or cavity is covered by the outer insulation, and wherein the outer insulation is supported and/or covered in or on the at least one cavity by at least one support element and/or provided with a pressure equalization opening. The invention further relates to a battery cell.