Prismatic Battery Can With Nested Pouch for Electrolyte Injection
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Solution Overview
Problem
The electrolyte injection process in prismatic type secondary batteries is inefficient, leading to low productivity and stability concerns due to the lack of a vent structure, while pouch type batteries have high efficiency but lack rigidity and stability.
Innovation Solution
A prismatic type secondary battery design that incorporates a pouch type battery into a prismatic can, with a cap assembly including a vent structure and a metal current collector, ensuring rigidity and stability, and utilizing a production line from pouch type batteries to reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a prismatic can is used to accommodate the electrode assembly, then structural stability and rigidity are improved, but electrolyte injection efficiency deteriorates
Solution Approach 1:
The patent applies nesting by placing a pouch-type electrode assembly inside a prismatic can. The pouch contains the electrode assembly and is inserted into the prismatic can, creating a nested structure that combines the structural advantages of the prismatic can with the manufacturing advantages of the pouch type battery. This resolves the contradiction by allowing efficient electrolyte injection into the pouch while maintaining the structural stability of the outer prismatic can.
2Productivity
If a pouch type structure is used, then electrolyte injection efficiency is improved, but structural stability and rigidity deteriorate
Solution Approach 1:
The pouch-type electrode assembly is nested within the prismatic can, allowing the inner pouch to provide efficient electrolyte injection characteristics while the outer prismatic can provides structural stability and rigidity. This nested configuration enables both contradictory requirements to be satisfied simultaneously.
3Reliability
If a vent structure is added to the prismatic can, then safety is improved, but device complexity increases
Solution Approach 1:
The cap assembly serves multiple functions: it seals the electrolyte injection hole, provides a vent structure for safety, and supports the electrode leads. By integrating these multiple functions into a single component, the vent structure is added without proportionally increasing device complexity. The cap assembly acts as a multi-functional element that addresses safety requirements while maintaining manufacturing efficiency.
Data Source
AI summary
A prismatic type secondary battery includes a pouch type secondary battery in which an electrode assembly having an electrode lead connected thereto is accommodated in a pouch, a prismatic can having one side open to accommodate the pouch type secondary battery, and a cap assembly including a metal current collector and inserted into the open side of the prismatic can, and in this case, the electrode lead is bent while being connected to the metal current collector when the cap assembly is inserted, and the prismatic type secondary battery improves the efficiency of an electrolyte injection process through a structure in which a pouch type secondary battery is inserted into a prismatic can.