Battery Cap Plate Assembly With Integrated Terminal Sealing
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Solution Overview
Problem
Secondary batteries face issues with electrolyte leakage between the cap plate and electrode terminal due to material differences, leading to increased component count and complexity in joining different metallic materials, which results in high resistance and inefficiency in electric power transmission.
Innovation Solution
A cap plate assembly is designed with a first electrode part that includes a terminal plate, insulation part, electrode terminal, and sub-plate made of different materials, stacked in the width or length direction of the cap plate. This assembly is manufactured using insert-injection molding to form the insulation part and by joining the terminal plate and electrode terminal through welding and direct bonding, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket is installed between the cap plate and the electrode terminal to prevent electrolyte leakage, then the leakage prevention is improved, but the number of components increases and the manufacturing complexity increases
Solution Approach 1:
The patent merges the sealing function into the electrode terminal structure itself by forming a sealing protrusion that fits into a sealing groove on the cap plate. This integration eliminates the need for separate gaskets while maintaining effective electrolyte leakage prevention, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The electrode terminal structure provides its own sealing capability through the integrated sealing protrusion and groove mechanism. The terminal serves dual purposes: electrical conduction and sealing, eliminating the need for external sealing components and simplifying the overall device structure
2Use of energy by moving object
If different types of metallic materials are joined between the electrode terminal and busbar, then the electrical conductivity is improved, but the joining process becomes complicated and the resistance value increases
Solution Approach 1:
The patent applies local quality by using different metallic materials only where necessary for optimal electrical conductivity (at the electrode terminal and busbar interfaces), while using the same material for the cap plate and electrode terminal body. This localized material differentiation improves power transmission efficiency without requiring complex multi-material joining processes throughout the entire structure
Solution Approach 2:
The patent employs composite material construction with the electrode terminal made of first metallic material and the busbar made of second metallic material, joined through welding or direct bonding. This composite approach optimizes electrical conductivity at critical interfaces while maintaining manufacturing feasibility through established joining techniques
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 cap plate assembly effectively prevents electrolyte leakage, simplifies the manufacturing process, reduces resistance between the electrode assembly and busbar, and enhances the efficiency of electric power transmission.
Implementation Method 1
the first insulation part may be formed on the cap plate and the first terminal plate by insert-injection molding so as to be formed between the cap plate and the first terminal plate
Implementation Method 2
by joining the terminal plate and electrode terminal through welding and direct bonding, respectively
Implementation Method 3
so that a current is applied to the first terminal plate from the inside of the housing
Data Source
AI summary
The present disclosure relates to a cap plate assembly, a method of manufacturing a cap plate assembly, and a battery cell including the same. The cap plate assembly may include a cap plate formed to cover an upper side of a housing and having a first accommodation hole formed through at least a part of the cap plate so that the inside and outside of the housing communicate with each other, and a first electrode part coupled to the first through-hole from above and below the cap plate.