Bus Bar Resin Shielding in Power Storage Module Gaps
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Solution Overview
Problem
The discharge of hot gas containing electrically-conductive debris from power storage cells can lead to short-circuiting with bus bars, posing a risk of electrical faults in power storage devices.
Innovation Solution
A power storage device design that includes a resin member covering the bus bar between modules, with a specific arrangement of modules, bus bars, and wire harnesses, along with a cooling plate and reinforcement members to prevent debris contact and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power storage modules are arranged close together to increase energy density, then productivity and space utilization improve, but the risk of short-circuiting from debris increases
Solution Approach 1:
A resin member is introduced as an intermediary substance between adjacent power storage modules to cover and protect bus bars. This mediator prevents direct contact between debris and conductive components while maintaining close module spacing for high energy density.
Solution Approach 2:
The resin member is pre-applied to bus bars before module assembly, creating a protective barrier in advance. This preliminary protective action prevents potential short-circuits before they can occur, allowing modules to be arranged closely without increasing risk.
2Ease of operation
If bus bars are exposed for electrical connection, then ease of operation improves, but the risk of debris contact and short-circuiting increases
Solution Approach 1:
The resin member is selectively applied only to specific portions of the bus bar where debris contact risk exists, while leaving other portions exposed for electrical connections. This localized protection maintains operational ease while preventing harmful effects.
Solution Approach 2:
The resin member serves as a localized intermediary coating on the bus bar surface, providing protection where needed while maintaining electrical contact capability at connection points.
3Reliability
If resin member is added to cover bus bar, then protection against short-circuiting improves, but device complexity increases
Solution Approach 1:
A thin resin coating is applied to the bus bar surface, providing effective protection against debris contact while adding minimal structural complexity. The thin film approach maintains simplicity while achieving the protective function.
Solution Approach 2:
The resin member combines insulating properties with adhesive characteristics, creating a composite protective layer that integrates multiple functions (electrical insulation, mechanical adhesion, debris barrier) into a single component, reducing overall device complexity.
Data Source
AI summary
A power storage device comprises a first power storage module, a second power storage module spaced apart from the first power storage module, a bus bar connected to the second power storage module and passing between the first power storage module and the second power storage module, and a resin member that is disposed between the first power storage module and the second power storage module and that covers the bus bar between the first power storage module and the second power storage module.