Cover assembly for prismatic battery cells and method for producing such cover assembly
The lid assembly for prismatic battery cells addresses conductivity issues by using projections to perforate the insulating member's outer skin during assembly, ensuring stable electrical connections and reducing resistance, thus effectively managing parasitic currents.
JP2026524597APending Publication Date: 2026-07-23FREUDENBERG SEALING TECHNOLOGIES SAS DI EXTERNA ITALIA SRLU
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- FREUDENBERG SEALING TECHNOLOGIES SAS DI EXTERNA ITALIA SRLU
- Filing Date
- 2023-06-06
- Publication Date
- 2026-07-23
AI Technical Summary
Technical Problem
Existing lid assemblies for prismatic battery cells suffer from non-uniform interfaces, shape and position tolerances, and material density variations in insulating members, leading to increased electrical resistance and parasitic current issues.
Method used
The lid assembly incorporates projections on the insulating member or terminal/base plate to perforate the outer skin during assembly, ensuring consistent electrical conductivity and reducing non-uniformity and positioning errors, with optional compressible conductive layers for further improvement.
Benefits of technology
The solution maintains desired electrical resistance within a range of 100 to 10,000 ohms, effectively discharging parasitic currents and improving structural stability while preventing short circuits.
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Smart Images
Figure 2026524597000001_ABST
Abstract
A lid assembly (1) for a rectangular battery cell is described, comprising a base plate (4), a current collector (5) electrically connectable to each electrode of the battery cell to collect electrical energy, a terminal (6) electrically coupled to the current collector (5) and for receiving electrical energy from the current collector, and an insulating member (7) sandwiched between the terminal (6) and the base plate (4) to electrically insulate the terminal (6) from the base plate (4), wherein the insulating member (7) has an inner portion (7b) and an outer skin (7a) surrounding the inner portion (7b) and defining its outer surface, and at least one of the inner portion (7b) of the insulating member (7), the terminal (6), and the base plate (4) includes at least one projection (13) protruding therefrom to perforate the outer skin (7a) from the inside or the outside, respectively.
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