Battery Cell Injection Hole Placement for Tab-Safe Electrolyte Diffusion
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Solution Overview
Problem
The arrangement of liquid injection holes in batteries relative to tab portions affects the liquid injection effect and safety performance, with existing configurations either causing electrolyte to spray onto tabs or resulting in inadequate electrolyte diffusion, impacting charging and discharging rates and structural integrity.
Innovation Solution
The battery design includes liquid injection holes positioned on the battery casing opposite to larger surfaces of tab portions, with a controlled minimum vertical distance and width ratio (5≤b/a≤20) to ensure reliable electrolyte injection without impacting tab portions, ensuring proper electrolyte infiltration and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid injection holes are arranged close to tab portions to improve electrolyte injection efficiency, then injection effect is improved, but electrolyte sprays onto tabs causing safety issues
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-setting the safe distance range (5≤b/a≤20) between liquid injection holes and tab portions during the design phase. This predetermined spatial relationship ensures that when liquid injection occurs, the electrolyte will naturally diffuse away from the tab portions without requiring real-time control adjustments, thus preventing electrolyte spraying while maintaining injection efficiency.
2Object-affected harmful factors
If liquid injection holes are positioned far from tab portions to prevent electrolyte spraying, then safety is improved, but electrolyte diffusion becomes inadequate
Solution Approach 1:
The patent applies parameter changes by optimizing the spatial parameters (distance ratio b/a between 5 and 20) of the liquid injection hole relative to the tab portion. This parameter optimization creates a balanced configuration where the liquid injection hole is far enough to prevent electrolyte spraying onto tabs (improving safety) but close enough to ensure adequate electrolyte diffusion into the cell (maintaining productivity).
3Ease of manufacture
If liquid injection holes are arranged on the same side as tab portions for structural simplicity, then manufacturing is easier, but charging and discharging rates are affected
Solution Approach 1:
The patent applies dimensionality change by transitioning from a one-dimensional arrangement (injection holes on the same side as tabs) to a three-dimensional spatial configuration (injection holes on the opposite side at a specific distance). This spatial reconfiguration in multiple dimensions allows the system to simultaneously achieve manufacturing feasibility and optimal charging/discharging performance by ensuring proper electrolyte diffusion pathways.
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
This configuration enhances the overcurrent capability, charging and discharging rates, and overall performance of the battery by preventing electrolyte from affecting tab portions during injection, ensuring effective electrolyte diffusion and structural integrity.
Implementation Method 1
ensuring proper electrolyte infiltration and maintaining structural integrity
Data Source
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AI summary
A battery includes a battery casing (10) and a cell (20) disposed in the battery casing (10). The battery casing (10) has a liquid injection hole (11). The cell includes a cell body (21) and a tab portion (22). The tab portion (22) extends from a side surface of the cell body (21), the liquid injection hole (11) is located on a side of the cell body (21) adjacent to the tab portion (22), and the liquid injection hole (11) is disposed on a surface of the battery casing (10) opposite to a larger surface of the tab portion (22). In a direction perpendicular to an extending direction of the cell body (21) and the tab portion (22), a minimum vertical distance between the liquid injection hole (11) and the tab portion (22) is a, and a width of the cell body (21) is b, where 5≤b/a≤20.