Battery Cell Terminal Structure for Faster Electrolyte Injection
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Solution Overview
Problem
Existing battery cells require improvements in use performance and manufacturability, particularly in terms of electrolyte injection efficiency, structural complexity, and space utilization of the post terminal area, which affects current passage efficiency and energy density.
Innovation Solution
The liquid injection hole is formed on the post terminal cover plate, with a communication channel on the post terminal body, allowing for increased post terminal area without enlarging the housing, and incorporating accommodating grooves to buffer electrolyte solution and reduce splashing, while optimizing the conductive part's placement to enhance energy density and structural simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid injection hole is disposed on the housing, then the housing structure is simplified, but the post terminal area becomes congested and current passage efficiency decreases
Solution Approach 1:
The liquid injection hole is extracted from the housing and relocated to the post terminal cover plate. This separation allows the housing to maintain its simple structure while the post terminal area is freed from congestion, enabling both the housing simplicity and current passage efficiency to coexist without conflict.
2Area of stationary object
If the post terminal area is enlarged to improve connection, then the connection area increases, but the housing dimension must be increased
Solution Approach 1:
The liquid injection hole is merged into the post terminal cover plate structure, allowing the post terminal area to be enlarged for improved connection without requiring additional housing space. The housing dimension remains unchanged while the post terminal connection area is expanded.
3Reliability
If the housing is thickened to weld sealing pin, then sealing reliability improves, but weight and material cost increase
Solution Approach 1:
The liquid injection hole is extracted from the housing and placed on the post terminal cover plate, eliminating the need to thicken the housing for welding sealing pins. The housing maintains its original thin structure, reducing weight and material cost while sealing reliability is maintained through the alternative sealing arrangement on the cover plate.
4Productivity
If the liquid injection hole is made larger to improve injection efficiency, then injection speed increases, but machining precision and structural strength decrease
Solution Approach 1:
The post terminal cover plate is designed with a buffer cavity that preliminarily receives and cushions the electrolyte solution before it enters the main injection channel. This preliminary action allows for better control of injection flow, maintaining both injection speed and machining precision by reducing the direct impact of high-speed injection on the hole structure.
Data Source
AI summary
A battery cell, a battery and an electric device, relating to the technical field of batteries. The battery cell comprises: a housing, an electrode column body and an electrode column cover plate, wherein the housing defines an accommodating cavity; the electrode column body is arranged on the housing; a communication channel in communication with the accommodating cavity is formed on the electrode column body; the electrode column cover plate is arranged on the electrode column body; and a liquid injection hole in communication with the communication channel is formed in the electrode column cover plate.