Battery Pack Gap Layout for Cell Expansion and Space Utilization
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Solution Overview
Problem
Existing battery packs face challenges in balancing battery expansion with space utilization, as reserving gaps between batteries either wastes space or fails to alleviate expansion effectively, impacting service life and safety.
Innovation Solution
A battery pack design with a gap ratio (c/a) between neighboring batteries ranging from 0.01 to 0.5, where c is the gap and a is the expansion rate, allowing for efficient expansion buffering while optimizing space use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a gap is reserved between neighboring batteries to alleviate battery expansion, then battery service life is improved, but space utilization of the battery pack is reduced
Solution Approach 1:
The patent applies parameter changes by establishing a quantitative relationship between the gap size and battery expansion rate, expressed as c/a=0.01-0.5. This parameter-based approach transforms the gap design from a qualitative decision into a precise calculation, allowing the gap to be optimized based on actual battery expansion characteristics rather than using fixed conservative values
Solution Approach 2:
The patent implements dynamics by making the gap design adaptive to different battery types and expansion rates. Instead of using a uniform static gap for all batteries, the gap size dynamically adjusts according to the specific expansion rate of each battery type, allowing the system to optimize space utilization while providing adequate expansion buffer for each battery
2Reliability
If a large gap is reserved between batteries, then battery expansion is effectively alleviated, but the number of batteries that can be installed is reduced
Solution Approach 1:
The patent uses parameter changes to transition from qualitative gap descriptions to quantitative precision. By defining the gap-to-thickness ratio c/a within 0.01-0.5 and linking it to the expansion rate a, the patent enables precise calculation of optimal gap sizes, maximizing battery density while ensuring adequate expansion space
Solution Approach 2:
The patent applies partial action by providing just enough gap space to handle the actual expansion needs of batteries, rather than reserving excessive uniform gaps. This targeted approach ensures adequate expansion buffer for each battery while minimizing wasted space, allowing maximum battery installation density
3Volume of stationary object
If a small gap is reserved between batteries, then space utilization is improved, but battery expansion cannot be effectively alleviated
Solution Approach 1:
The patent employs parameter changes to establish a minimum gap threshold based on battery expansion characteristics. By calculating the required gap using the c/a ratio, the patent ensures that even small gaps are sufficient to prevent battery degradation, eliminating the need for unnecessarily large gaps that would reduce space utilization
4Ease of manufacture
If uniform gaps are reserved between all batteries, then manufacturing simplicity is maintained, but overall space utilization is significantly reduced
Solution Approach 1:
The patent applies parameter changes by replacing uniform gap design with a calculation-based approach. The gap size is determined by the formula c/a=0.01-0.5, where c is the gap and a is the expansion rate. This allows different gap sizes for different battery positions and types, optimizing space utilization while maintaining manufacturing feasibility through clear calculation criteria
Data Source
AI summary
This application provides a battery pack, a vehicle, and an energy storage device. The battery pack includes at least one battery sequence. The battery sequence includes a plurality of batteries. A thickness of each battery extends along a first direction. The plurality of batteries are successively arranged along the first direction to form the battery sequence. At least one of the batteries includes a casing and a core packaged in the casing. A gap exists between at least two neighboring batteries. A ratio of the gap to the thickness of the battery is c, and c satisfies the following relational expression: c/a=0.01−0.5, where a represents an expansion rate of the battery.