Prismatic Battery Can Recess Forming for Internal Gap Control
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Solution Overview
Problem
In prismatic battery cells, the internal gaps between the battery can and electrode stacks are not uniformly controlled, leading to heterogeneous contact conditions between cathodes and anodes, which exacerbates the Li-Plating phenomenon, deteriorating electrochemical performance.
Innovation Solution
A process is introduced to control internal gaps by forming face recesses on the battery can walls after sealing, using controlled pressure to achieve predefined final gaps, ensuring uniform contact conditions between the electrode stacks and the can walls, thereby reducing Li-Plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If predefined insertion gaps are used to enable seamless insertion of electrode stacks, then ease of manufacture is improved, but manufacturing precision of internal gaps deteriorates
Solution Approach 1:
The patent applies preliminary action by forming face recesses in the battery can walls before inserting the electrode stacks. These pre-formed recesses create controlled initial gaps that ensure seamless insertion while establishing a foundation for subsequent uniform contact conditions through controlled pressure application.
Solution Approach 2:
The patent changes the physical state and dimensions of the battery can walls by applying controlled pressure during assembly. This pressure causes plastic deformation of the can walls, reducing the internal gaps from the initial insertion gap size to a controlled final gap size, thereby improving manufacturing precision of the internal gaps while maintaining ease of manufacture.
2Ease of manufacture
If manufacturing tolerances of battery can and electrode stacks are combined, then ease of manufacture is improved, but manufacturing precision of internal gaps deteriorates
Solution Approach 1:
The patent applies parameter changes by using controlled pressure to plastically deform the battery can walls during assembly. This process transforms the internal gaps from being determined by random tolerance combinations to being controlled by the applied pressure, achieving uniform final gap dimensions despite variations in initial component dimensions.
Solution Approach 2:
The patent uses preliminary action by forming face recesses before final assembly. These recesses are designed to accommodate the electrode stacks with predetermined clearance, establishing a baseline that subsequent controlled pressure can refine to achieve the target internal gap dimensions, thereby compensating for manufacturing tolerances.
3Ease of manufacture
If internal gaps are not controlled, then ease of manufacture is improved, but electrochemical performance deteriorates due to Li-Plating
Solution Approach 1:
The patent applies parameter changes by controlling the internal gap dimensions through applied pressure during assembly. This controlled pressure plastically deforms the battery can walls to reduce internal gaps to specific target dimensions, ensuring uniform contact conditions between electrode stacks and can walls, which prevents Li-Plating while maintaining ease of manufacture.
Solution Approach 2:
The patent implements feedback by using controlled pressure application that responds to the actual assembly state. The pressure control system adjusts the deformation of battery can walls based on feedback from sensors or pre-programmed parameters, ensuring that the final internal gaps achieve the precise dimensions needed for optimal electrochemical performance and Li-Plating prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The controlled internal gaps result in more uniform and homogeneous contact conditions, significantly reducing Li-Plating occurrences and enhancing the electrochemical performance of the battery cells.
Implementation Method 1
a face recess is plastically formed on at least one of said opposite main walls after that said opening of said battery can is sealed. A depth of said face recess is reached during the face recess forming stage by applying a controlled pressure on said at least one of the opposite main walls
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4
AI summary
The invention relates to a process for controlling internal gaps (18) inside a battery cell (1) between opposite main walls (3, 4) of a battery can (2) and at least one electrode stack (10) inserted in said battery can (2). Insertion gaps (16) are arranged between the opposite main walls (3, 4) of the battery can (2) and said at least one electrode stack (10) so that said at least one electrode stack (10) can be seamlessly inserted into the battery can (2) through an opening (8) formed on the top of said battery can (2). Then, a face recess (17) is plastically formed on at least one of said opposite main walls (3, 4) after that said opening (8) of said battery can (2) is sealed. A depth of said face recess (17) is reached during the face recess forming stage by applying a controlled pressure on said at least one of the opposite main walls (3, 4) so that predefined final internal gaps (18) are achieved between the opposite main walls (3, 4) of the battery can (2) and said at least one electrode stack (10).