Battery Current Collector Layout for Low-Friction Electrode Insertion
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Solution Overview
Problem
The manufacturing process of flat wound-type secondary batteries can cause damage to the electrode body due to friction with the battery can during insertion.
Innovation Solution
The energy storage device design includes a container with a first and second wall portion, a current collector with a terminal connection, intermediate, and bent portions that facilitate smooth placement of the electrode body along the container wall, reducing friction and potential damage during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the wound group is inserted from an open end of the battery can, then the manufacturing process is simple, but the electrode body may be damaged by friction from the battery can
Solution Approach 1:
The current collector is pre-formed with a bent portion that allows it to navigate the corner of the container body before the electrode body is inserted. This preliminary shaping of the current collector enables smooth insertion without friction damage to the electrode body.
Solution Approach 2:
The bent portion of the current collector acts as an intermediary element that facilitates the insertion process. It serves as a guide and buffer between the electrode body and the container body corner, preventing direct contact and friction damage.
2Quantity of substance
If the electrode body is tightly accommodated in the container, then energy density increases, but the electrode body may be damaged during insertion
Solution Approach 1:
The current collector is pre-formed with a bent portion that creates insertion clearance and guidance path before the electrode body enters the container. This allows tight accommodation while preventing damage during the insertion process.
Solution Approach 2:
The bent portion of the current collector introduces curvature to the otherwise linear insertion path. This curved configuration allows the electrode body to navigate around the container corner smoothly, reducing friction and damage while maintaining tight fit.
3Device complexity
If the current collector is directly connected to the terminal without a bent portion, then the structure is simpler, but the electrode body cannot be smoothly located during manufacturing
Solution Approach 1:
The bent portion is pre-formed on the current collector to create the necessary insertion geometry. This preliminary shaping enables smooth electrode body placement while adding minimal complexity to the current collector structure.
Solution Approach 2:
The bent portion adds a spatial dimension to the current collector configuration, allowing it to navigate the corner of the container body. This three-dimensional configuration simplifies the manufacturing process by enabling smooth electrode body insertion.
Data Source
AI summary
An energy storage device includes an electrode body, a current collector electrically connected to the electrode body, a container accommodating therein the electrode body and the current collector, and a terminal attached to the container and electrically connected to the current collector. The container includes a container body and a container lid joined to the container body. The container body includes a first wall portion and a second wall portion extending from at least a portion of a peripheral edge of the first wall portion. The current collector includes a terminal connection portion joined to the terminal, an intermediate portion extending from the terminal connection portion along the first wall portion, a bent portion facing the terminal connection portion from the intermediate portion, and an electrode body connection portion extending from the bent portion to approach the terminal connection portion and joined to the electrode body.