Battery Pack Assembly Gap for Swelling Cell Service Life
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Solution Overview
Problem
Battery packs face reduced service life due to increased squeezing force between adjacent batteries caused by swelling over time, which affects their performance and longevity.
Innovation Solution
A battery pack design where a gap is intentionally created between adjacent batteries during assembly, allowing for swelling without generating a pre-pressing force, and using a conductive connector or fixing bracket for secure placement within the battery box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If batteries are tightly arranged in the battery box during assembly, then space utilization and energy density are improved, but squeezing force increases between adjacent batteries causing reduced service life
Solution Approach 1:
The battery pack structure is segmented into modular units with independent battery modules. Each module contains batteries arranged in a specific pattern with controlled spacing, allowing the system to maintain high energy density while managing swelling forces locally within each module rather than across the entire battery pack.
Solution Approach 2:
Batteries are nested within modular compartments that provide structural support and controlled spacing. The modular design allows batteries to be nested in a configuration where swelling forces are contained and distributed, preventing direct contact between adjacent batteries while maintaining compact overall structure.
2Reliability
If a gap is created between adjacent batteries to accommodate swelling, then service life is extended, but space utilization and energy density decrease
Solution Approach 1:
The battery module structure incorporates dynamic adjustment capabilities through elastic support elements and compliant mounting mechanisms. These elements allow the structure to adapt to battery swelling over time, maintaining optimal spacing and contact forces dynamically rather than relying on fixed rigid structures.
Solution Approach 2:
The design changes the physical parameters of the battery module structure, including using elastic materials with specific modulus values, designing gap dimensions as percentages of battery dimensions, and optimizing the stiffness of support structures to balance space utilization with swelling accommodation.
Data Source
AI summary
A battery pack and an assembling method for the battery pack are provided. The battery pack includes a battery box, a first battery and a second battery. The first battery is disposed in the battery box and includes a first stack surface. The first stack surface includes a first peripheral region and a first intermediate region. The second battery is disposed in the battery box and adjacent to the first battery and includes a second stack surface. The second stack surface includes a second peripheral region and a second intermediate region. At least a part of the first peripheral region is arranged opposite to the second peripheral region, and at least a part of the first intermediate region is arranged opposite to the second intermediate region, and a gap is defined between the at least a part of the first peripheral region and the second peripheral region.