Battery Cell Insulation Structure for High-Voltage Shell Isolation
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Solution Overview
Problem
High-voltage environments in battery cells lead to lithium plating corrosion and potential combustion or explosion due to high voltage between the positive/negative terminal posts and the shell, posing a risk of breakdown.
Innovation Solution
A battery cell design incorporating a first insulating protective layer on the inner wall of the shell and a second insulating protective layer enveloping the electrode assembly, enhancing creepage distance and breakdown voltage resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery cells are connected in series to form a battery pack, then high voltage is generated, but the shell of the battery cell undergoes lithium plating corrosion breakdown under high voltage
Solution Approach 1:
An insulating protective layer is introduced as an intermediary substance between the shell and the electrode assembly/electrolyte solution. This protective layer acts as a mediator that prevents direct contact and chemical reactions, thereby protecting the shell from lithium plating corrosion and breakdown under high voltage conditions without affecting the battery's power output.
2Device complexity
If the shell is directly exposed to the electrolyte solution, then the structure is simple, but the shell is susceptible to high-voltage breakdown
Solution Approach 1:
A thin film insulating protective layer is applied to the inner wall of the shell. This thin film provides effective electrical insulation and chemical protection while maintaining the overall simplicity of the battery structure and not significantly increasing device complexity.
3Reliability
If the creepage distance between the shell and electrode assembly is increased, then breakdown voltage resistance is improved, but the space within the battery cell is reduced
Solution Approach 1:
A thin film insulating protective layer is used to provide electrical insulation between the shell and the electrode assembly. This thin film approach increases the creepage distance and improves breakdown voltage resistance while occupying minimal space within the battery cell's accommodating cavity.
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 insulating protective layers effectively increase the breakdown voltage resistance between the shell and electrode assembly, reducing the probability of combustion or explosion.
Implementation Method 1
the first insulating protective layer is disposed on an inner wall of the shell; and the second insulating protective layer is configured to envelop at least a portion of the electrode assembly
Data Source
AI summary
A battery cell, a battery, and an electrical device are described. The battery cell includes a shell, an electrode assembly, a first insulating protective layer, and a second insulating protective layer. The first insulating protective layer is disposed on an inner wall of the shell, and the second insulating protective layer is configured to envelop at least a portion of the electrode assembly. The battery cell provided in the embodiments of the present application uses the first insulating protective layer and the second insulating protective layer to separate the shell from the electrode assembly, thereby increasing the creepage distance between the shell and the electrode assembly. This can achieve the purpose of improving the breakdown voltage resistance between the shell and the electrode assembly, thereby effectively enhancing the high-voltage breakdown resistance of the shell, and consequently reducing the probability of combustion or explosion of the battery cell.