Battery Pack Exterior Casing Volume Efficiency
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Solution Overview
Problem
Existing battery packs with metal exterior casings have restricted volume efficiency due to engagement parts, leading to low volume efficiency and a high number of parts, which limits design flexibility and increases costs.
Innovation Solution
A battery pack design featuring a box-shaped exterior casing formed from a single plate-shaped member, covering five faces of the nonaqueous electrolyte secondary battery, including a first end face from which terminals are led out, with no engagement parts, allowing for terminal extension along connection portions and use of dead space for increased design flexibility without reducing volume efficiency, and utilizing a support to protect terminal extensions and anchor the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two members are engaged in the exterior casing to serve as end faces, then the battery pack provides structural support and terminal protection, but the engagement parts restrict space for receiving the battery element, leading to low volume efficiency
Solution Approach 1:
The invention merges the exterior casing and the support into a single integrated component. The support is formed as an integral part of the exterior casing, eliminating the need for separate engagement parts while maintaining both structural support and terminal protection functions. This integration removes the engagement parts that were restricting space, thereby improving volume efficiency.
2Reliability
If two members are engaged in the exterior casing to serve as end faces, then the battery pack provides structural support and terminal protection, but the number of parts increases
Solution Approach 1:
The invention combines multiple functional components (exterior casing and support) into a single integrated part. The support is formed as an integral portion of the exterior casing, reducing the total number of parts while maintaining all necessary structural and protective functions.
3Strength
If engagement parts are used in the exterior casing, then the battery pack provides structural integrity, but the engagement parts prevent an increase in volume efficiency
Solution Approach 1:
The invention integrates the support structure directly into the exterior casing, forming a unified component that provides structural integrity without requiring separate engagement parts. This integration eliminates the space-consuming engagement parts while maintaining the necessary strength and structural stability of the battery pack.
Data Source
AI summary
A battery pack is provided. The battery pack includes a nonaqueous electrolyte secondary battery that includes a substantially thin-plate-shaped battery element covered with a laminated sheet such that a positive electrode terminal and a negative electrode terminal are exposed, and has a first end face from which the positive electrode terminal and the negative electrode terminal are led out. An exterior casing covers five faces of the nonaqueous electrolyte secondary battery, the five faces excluding a second end face next to the first end face. A support covers the second end face of the nonaqueous electrolyte secondary battery. At least one of the positive electrode terminal and the negative electrode terminal is extended along a first connection portion provided for the first end face and a second connection portion provided for the second end face and is connected to an external power supply provided for the support.