Prismatic Battery Cell End-Tab Terminal Layout
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Solution Overview
Problem
Lithium-ion battery cells are sensitive to environmental influences such as air and humidity, and existing designs require significant space for collectors, limiting the capacity of the battery cell within a given housing size.
Innovation Solution
The battery cell features anode and cathode contact lugs that extend to the same end surface of the prismatically-designed cell housing, reducing the space required for collectors and allowing for a larger electrode coil, thereby increasing capacity while maintaining the same housing dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If collectors are used to connect electrodes to terminals, then electrical connection is achieved, but significant space is consumed limiting battery capacity
Solution Approach 1:
The patent merges the function of collectors with the cell housing by making the housing itself electrically conductive and using it as the collector. The housing serves dual purposes: mechanical protection and electrical connection, eliminating the need for separate collector components and thereby reducing the space they occupy, which increases the volume available for active materials and battery capacity.
Solution Approach 2:
The cell housing is designed to perform multiple functions simultaneously: it provides mechanical protection for the electrode coil, maintains structural integrity, and serves as an electrical conductor for current collection. This multi-functionality eliminates the need for dedicated collector components, reducing overall space requirements and increasing battery capacity within the same housing dimensions.
2Quantity of substance
If battery cell dimensions are increased to accommodate larger electrode coils, then capacity increases, but housing size increases
Solution Approach 1:
By integrating the collector function into the housing structure, the patent eliminates the space that would otherwise be occupied by separate collector components. This allows the electrode coil to be positioned more efficiently within the housing, maximizing the use of available space for active materials without increasing the external housing dimensions, thereby increasing capacity within the same footprint.
3Ease of manufacture
If contact lugs extend to different end surfaces, then electrode connection is simplified, but space utilization is reduced
Solution Approach 1:
The patent positions both anode and cathode contact lugs to extend to the same end surface of the housing, merging their exit points. This configuration allows for more efficient space utilization within the housing while maintaining ease of manufacturing through standardized connection points. The housing's conductive nature ensures proper electrical connection without requiring complex collector structures.
Data Source
AI summary
The invention relates to a battery cell (2), comprising a prismatically designed cell housing (3) with a cover surface (31), on which a negative terminal (11) and a positive terminal (12) are arranged, and at least one electrode coil (10) which is arranged inside the cell housing (3) and comprises a cathode (14) having cathode contact lugs (24) and an anode (16) having anode contact lugs (26). The cathode contact lugs (24) and the anode contact lugs (26) extend next to one another from the electrode coil (10) toward exactly one end face (35, 36) of the cell housing (3), the end face (35, 36) running at a right angle to the cover surface (31). The invention also relates to a battery system comprising at least one battery cell (2) according to the invention.