Insulating Covering for Battery Protrusions
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Solution Overview
Problem
Conventional power storage devices with laminated film batteries are prone to short circuits when the electrolyte solution leaks out, as there is no effective insulation to prevent electrical contact between the cells.
Innovation Solution
A power storage device design that includes a covering portion made of insulating material covering protrusions on the current collector plates, which are connected to the power storage cells, to prevent short circuits even if the electrolyte solution leaks out of the laminated film, along with a thermally conductive filling portion to enhance cooling and reduce resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a laminated film is used to cover electrode bodies and current collector plate, then the power storage device achieves a compact structure with good sealing, but the risk of short circuit increases when electrolyte solution leaks out
Solution Approach 1:
An insulating covering portion is introduced as an intermediary element between the current collector plate and other components. This covering portion specifically covers the protrusion of the current collector plate that extends beyond the laminated film, preventing direct electrical contact and short circuits when electrolyte leaks occur, while maintaining the compact laminated structure.
Solution Approach 2:
The insulating covering portion is pre-installed on the protrusion of the current collector plate before assembly. This beforehand protective measure ensures that even if the laminated film fails and electrolyte leaks, the protrusion is already protected with insulation, preventing short circuits without requiring additional protective measures after failure occurs.
2Reliability
If the current collector plate protrusion is left exposed, then the electrical connection is maintained, but the power storage device becomes vulnerable to short circuits upon electrolyte leakage
Solution Approach 1:
The insulating covering portion is applied locally only to the protrusion area of the current collector plate that extends beyond the laminated film, rather than covering the entire current collector plate. This localized insulation maintains electrical connection functionality where needed while providing protective insulation precisely where the short circuit risk exists due to electrolyte leakage.
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 solution effectively reduces the occurrence of short circuits and enhances cooling efficiency while minimizing resonance in the power storage device, ensuring reliable operation even when electrolyte leakage occurs.
Implementation Method 1
a covering portion made of an insulating material and covering a part of each of the plurality of power storage cells
Implementation Method 2
a thermally conductive filling portion to enhance cooling
Data Source
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AI summary
A power storage device (1) includes a plurality of power storage cells (101), a case (200) for accommodating the plurality of power storage cells, and a covering portion (15) made of an insulating material and covering a part of each of the plurality of power storage cells. Each power storage cell (101) includes a plurality of electrode bodies (110), a current collector plate (120) connected to the plurality of electrode bodies, a laminated film (130) covering the plurality of electrode bodies and a part of the current collector plate, and an electrolyte solution filling the laminated film. The current collector plate (120) includes a protrusion (122) protruding from the laminated film. The covering portion (15) covers the protrusion (122).