Assembled Battery Length Control via Cell Thickness Ranking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The variation in thickness among electrode bodies in assembled batteries leads to irregularities in the length of assembled batteries, causing mounting issues and requiring additional space for accommodation, as the existing methods fail to accurately control the external dimensions of assembled batteries.
Innovation Solution
A method involving the classification of battery cells into different thickness ranks based on their electrode body thickness, allowing for the selection and arrangement of cells to achieve a predetermined length in the arrangement direction, thereby offsetting thickness variations and ensuring precise dimensional conformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery cells are arranged and fastened with load applied in the arrangement direction, then the assembled battery achieves structural stability and compact mounting, but variation in electrode body thickness causes accumulation of length variation in the arrangement direction
Solution Approach 1:
The patent measures the thickness of electrode bodies before assembling battery cells into the final configuration. By performing this measurement and classification action in advance, the system can sort battery cells into different thickness ranks and deliberately arrange them to compensate for thickness variations, thereby preventing length variation accumulation in the finished assembled battery.
Solution Approach 2:
The patent applies different arrangement strategies to different groups of battery cells based on their measured thickness characteristics. By classifying battery cells into multiple thickness ranks and assigning specific arrangement positions to each rank, the system creates a non-uniform local arrangement that achieves uniform overall dimensions, rather than treating all cells identically.
2Productivity
If battery cells with varying electrode body thickness are arranged in the stacking direction, then production efficiency is maintained, but length variation accumulates causing mounting space issues
Solution Approach 1:
The measurement and classification of battery cell thickness is performed before the final assembly process, allowing for efficient sorting and arrangement planning without slowing down production. This preliminary categorization enables the subsequent assembly to proceed smoothly while ensuring dimensional accuracy.
Solution Approach 2:
The patent changes the arrangement parameter from random or uniform positioning to position-based sorting according to measured thickness values. By adjusting the arrangement strategy to account for thickness variations, the system maintains production efficiency while achieving consistent final dimensions.
3Adaptability or versatility
If allowance is increased to accommodate length variation, then mounting flexibility is improved, but design space is reduced and mounting efficiency decreases
Solution Approach 1:
This principle is not applicable to this patent as the solution does not involve pneumatic or hydraulic mechanisms.
Solution Approach 2:
By measuring and classifying battery cell thickness in advance, the system eliminates the need for excessive design allowances. The preliminary data collection enables precise arrangement planning that achieves tight tolerances without requiring additional space buffers.
Data Source
AI summary
A producing method of an assembled battery includes: preparing plural battery cells each of which includes an electrode body having a positive electrode and a negative electrode, and a container for housing the electrode body; classifying the plural battery cells into plural thickness ranks depending on a thickness in an arrangement direction of the electrode body housed inside each battery cell; and arranging the plural battery cells in the arrangement direction, and fastening the plural battery cells such that a load is applied to the plural battery cells in the arrangement direction, the plural battery cells being selected from the plural thickness ranks in a manner as to conform a length in the arrangement direction of the battery cells is adapted to a predetermined length when the plural battery cells are arranged in the arrangement direction.