Lower Plastic Assembly Venting for Fast Electrolyte Injection
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Solution Overview
Problem
Existing secondary batteries face issues with gas discharge during increased electrolyte injection speeds, leading to potential misoperation of explosion-proof valves and failure due to the small size of the liquid injection hole, which restricts the flow of gas and can cause explosions.
Innovation Solution
The design incorporates a lower plastic assembly with a larger first liquid-injection through-hole and a cutout that facilitates faster electrolyte flow and gas discharge, ensuring the electrolyte can flow quickly and preventing gas buildup, thereby avoiding valve misoperation and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquid injection hole size is increased to enable faster electrolyte injection, then the electrolyte injection speed increases and productivity improves, but the structural complexity of the lower plastic member increases due to the need for additional cutouts and modified hole configurations
Solution Approach 1:
The liquid injection system is segmented into multiple pathways: a first liquid-injection through-hole for primary electrolyte injection and a cutout for secondary injection and gas discharge. This segmentation allows each pathway to be optimized for its specific function, enabling faster overall injection speed while managing structural complexity through functional division
Solution Approach 2:
The cutout structure serves multiple functions simultaneously: it acts as a secondary liquid injection pathway for increased electrolyte flow, a gas discharge channel for pressure relief, and a structural feature that can be integrated into the lower plastic member design. This multi-functionality resolves the contradiction by achieving productivity improvement without proportionally increasing device complexity
2Productivity
If the liquid injection hole size is increased to allow faster electrolyte flow, then the electrolyte injection efficiency improves, but gas discharge capability deteriorates due to restricted gas flow paths in the housing
Solution Approach 1:
The injection and discharge functions are segmented into separate but connected structures: the first liquid-injection through-hole handles primary electrolyte injection while the cutout provides dedicated gas discharge pathways. This segmentation ensures that increased electrolyte flow does not compromise gas discharge capability, as each function has its own optimized pathway
Solution Approach 2:
The cutout acts as an intermediary structure that connects the liquid injection system with the gas discharge system. It allows electrolyte to flow through while simultaneously providing escape routes for gas bubbles, mediating between the conflicting requirements of fast electrolyte injection and effective gas discharge
3Loss of time
If the electrolyte injection speed is increased to reduce injection time, then the manufacturing time is reduced, but the risk of explosion-proof valve misoperation increases due to inadequate gas discharge
Solution Approach 1:
The cutout structures are pre-configured in the lower plastic member to provide gas discharge pathways before electrolyte injection begins. This preliminary arrangement of gas escape routes ensures that when high-speed electrolyte injection occurs, gas can be discharged immediately through the pre-positioned cutouts, preventing pressure buildup that would cause valve misoperation
Solution Approach 2:
The cutout serves as an intermediary channel that mediates between the high-speed electrolyte injection process and the gas discharge requirement. It allows the system to achieve fast injection times while maintaining valve reliability by providing a dedicated gas escape route that operates concurrently with the electrolyte injection
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 solution allows for increased electrolyte injection speed without risking explosion-proof valve failure, enhancing the safety and efficiency of the battery by ensuring effective gas discharge and preventing electrolyte overflow or waste.
Implementation Method 1
The first liquid-injection through-hole extends through the first-lower-plastic-member body and is located at one end of the first-lower-plastic-member body. A cutout is defined at one side of the first liquid-injection through-hole and is in direct communication with the first liquid-injection through-hole
Implementation Method 2
When the liquid injection speed is increased, gas in the housing cannot be discharged in time, and this may even lead to a misoperation of an explosion-proof valve
Data Source
AI summary
A lower plastic assembly, an energy storage apparatus, and an electric device are provided in the disclosure. The lower plastic assembly includes a first lower plastic member. The first lower plastic member includes a first-lower-plastic-member body. The first-lower-plastic-member body further has a first upper surface and a first lower surface. The first upper surface is opposite to the first lower surface. The first-lower-plastic-member body defines a first liquid-injection through-hole. The first liquid-injection through-hole extends through the first-lower-plastic-member body and is located at one end of the first-lower-plastic-member body. A cutout is defined at one side of the first liquid-injection through-hole and is in direct communication with the first liquid-injection through-hole, and the cutout extends through the first upper surface and the first lower surface.