Cylindrical Power Storage Cell Layout for Dual Current and Heat Paths
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Solution Overview
Problem
Conventional power storage devices face reliability issues due to inadequate electrical and mechanical connections, which affect their performance and longevity.
Innovation Solution
A power storage device design featuring a first electrode with a strip-shaped current collector and active material layer, a second electrode with a strip-shaped current collector and active material layer, and a separator forming a columnar wound body, along with a cylindrical case and a current collection plate that is electrically connected to both the electrode and the case, including an overlapping region for direct electrical connection and a non-overlapping region for enhanced heat dissipation and mechanical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collection plate is mechanically and electrically connected to the exposed current collector and the bottom of the case (conventional design), then the electrical connection is established, but the reliability is insufficient due to inadequate connection paths
Solution Approach 1:
The current collector is divided into two functional regions: an overlapping region that contacts the current collection plate for electrical connection, and a non-overlapping region that extends to contact the bottom of the case directly. This segmentation creates multiple independent connection paths, improving reliability without requiring a more complex overall structure.
Solution Approach 2:
The overlapping region acts as an intermediary between the current collection plate and the case bottom, providing a dedicated electrical connection path. Meanwhile, the non-overlapping region provides a direct mechanical contact path to the case bottom, creating redundant connection mechanisms that enhance system reliability.
2Temperature
If a single connection path is used between the electrode and case, then the structure is simple, but heat dissipation is insufficient
Solution Approach 1:
The current collector is segmented into overlapping and non-overlapping regions, creating two distinct heat dissipation paths: one through the current collection plate and another directly to the case bottom. This dual-path approach improves heat dissipation efficiency without adding complex thermal management systems.
3Reliability
If the current collector is fully covered by the current collection plate, then electrical connection is maximized, but mechanical contact with the case bottom is lost
Solution Approach 1:
The current collector is divided such that the overlapping region provides electrical connection through the current collection plate, while the non-overlapping region extends beyond the plate to make direct mechanical contact with the case bottom. This segmentation ensures both electrical and mechanical connection requirements are met simultaneously.
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
This configuration improves the reliability and heat dissipation characteristics of the power storage device by providing multiple paths for current flow and heat transfer, reducing resistance and stabilizing the wound body's attitude within the case.
Implementation Method 1
the first current collector of the first electrode has a contact part that is provided in at least a part of the non-overlapping region and contacts the bottom of the case
Implementation Method 2
a current collection plate that is provided between the first electrode and a bottom of the case and is electrically connected to both the first electrode and the bottom of the case
Data Source
AI summary
A power storage device includes a first electrode having a first current collector, a second electrode having a second current collector, and a separator interposed between the first electrode and the second electrode. The first electrode, the second electrode, and the separator constitute a wound body having a columnar shape. The power storage device further includes a case having a cylindrical bottomed shape for accommodating the wound body, and a current collection plate electrically connected to the first electrode and the case. The first electrode has an overlapping region overlapping the current collection plate when viewed from a case axial direction and a non-overlapping region not overlapping the current collection plate when viewed from the axial direction. The first electrode and the current collection plate are electrically connected to each other in the overlapping region. The first current collector is provided in at least a part of the non-overlapping region, and has a contact part in contact with the case bottom.