Battery Terminal Resin Structure for Heat and Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery designs face issues with heat resistance and impact durability of resin members, leading to potential short circuits when subjected to impacts or vibrations, as high heat resistance resins are fragile and lack sufficient impact resistance.
Innovation Solution
The battery incorporates a resin member with a first region of high melting point for heat resistance and a second region of lower melting point for improved impact resistance, integrated to prevent burning and melting, and enhance resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the resin member is formed of a resin with high heat resistance, then burning and melting due to heat effect can be suppressed, but the resin member becomes fragile and has low impact resistance
Solution Approach 1:
The resin member is designed with different materials in different regions: the first region (peripheral edge of through hole) uses high melting point material for heat resistance, while the second region (outer peripheral side) uses low melting point material for impact resistance. This local differentiation resolves the contradiction by assigning appropriate material properties to specific functional zones.
Solution Approach 2:
The resin member is formed as a composite structure integrating two different resin materials with distinct properties. The first material (high melting point) and second material (low melting point) are combined in a single molded piece, allowing the resin member to simultaneously exhibit heat resistance in critical areas and impact resistance in other areas.
2Reliability
If the resin member is formed of a resin with high heat resistance, then burning and melting due to heat effect can be suppressed, but the resin member is fragile and may be broken during use
Solution Approach 1:
Different regions of the resin member are assigned different material properties: the first region near the through hole uses high melting point material for heat resistance, while the second region uses low melting point material for impact resistance. This ensures reliability in heat-exposed areas while maintaining strength in impact-prone areas.
Solution Approach 2:
The resin member integrates two different resin materials to create a composite structure that simultaneously provides heat resistance and impact resistance in different regions, resolving the contradiction between reliability under heat and strength against impact.
3Object-affected harmful factors
If the resin member is broken due to impact, then the electrode body may collide with the resin member and be damaged, but using high heat resistance resin reduces impact resistance
Solution Approach 1:
The resin member uses low melting point material in the second region (outer peripheral side) where impact resistance is critical, while using high melting point material in the first region where heat resistance is critical. This prevents breakage in impact-prone areas while maintaining heat resistance where needed.
Solution Approach 2:
By combining two different resin materials in a composite structure, the resin member achieves both heat resistance and impact resistance, preventing both heat-induced damage and impact-induced breakage that could lead to electrode body damage.
Data Source
AI summary
A battery disclosed herein includes a battery case, an electrode body, a current collecting unit that is connected to a positive electrode or a negative electrode inside the battery case and includes a second through hole, a resin member that is disposed between the battery case and the current collecting unit and includes a first through hole, and a terminal that is inserted into the first through hole and the second through hole and has one end electrically connected to the current collecting unit inside the battery case. The resin member includes a first region provided on a peripheral edge of the first through hole and a second region provided on an outer peripheral side of the first region and formed with the first region integrally. A first material of the first region has a higher melting point than a second material of the second region.