Coin Cell Battery Module with V-Shaped Bonding Wire
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Solution Overview
Problem
Current technology faces challenges in manufacturing all-solid-state battery cells of large area due to the need for extra-high pressure pressing processes, which are difficult to apply effectively, limiting their application in battery modules.
Innovation Solution
A battery module is designed using coin cells with stacked arrays connected by bonding wires, where the bonding wire is bent in a V-shape and pressed between adjacent cells, allowing for efficient electrical connection and assembly, enabling the use of all-solid-state batteries in a module structure despite the difficulty in achieving large areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If all-solid-state battery cells are manufactured with large area, then energy capacity is improved, but manufacturing difficulty increases due to extra-high pressure pressing process requirements
Solution Approach 1:
The battery module is divided into multiple coin cell arrays, each comprising several coin cells stacked in series. This segmentation allows the use of small-area coin cells (which can be manufactured with existing pressing technology) while achieving the desired total energy capacity through parallel arrangement of multiple arrays.
Solution Approach 2:
Multiple coin cells are nested within cell carriers that hold them in stacked arrays. The cell carriers contain receiving holes that receive and organize the coin cells, creating a nested structure where small cells are contained within carriers, which are in turn arranged in modules.
2Reliability
If coin cells are connected using traditional wiring methods, then electrical connection is achieved, but device complexity and assembly difficulty increase
Solution Approach 1:
The bonding wire is bent into a V-shape that simultaneously connects electrode terminals of adjacent coin cells. This merged configuration replaces multiple separate wiring connections with a single integrated wire structure, reducing assembly steps and complexity.
Solution Approach 2:
The bonding wire acts as an intermediary element that facilitates electrical connection between coin cell arrays. The V-shaped wire is pressed between adjacent cells to establish electrical contact, serving as a simple mediator that enables connectivity without complex wiring harnesses.
3Temperature
If all-solid-state batteries are used, then operating temperature range is improved, but cooling system requirements are reduced, potentially affecting thermal management
Solution Approach 1:
The patent utilizes the inherent parameter change of all-solid-state batteries, which have a broader operating temperature range compared to liquid electrolyte batteries. This parameter change eliminates the need for active cooling systems in many applications, simplifying the overall battery module design.
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 approach allows for the creation of a battery module with enhanced energy capacity and improved operating temperature range, advancing the commercialization of all-solid-state batteries and reducing cooling-related issues, while maintaining structural integrity and functionality.
Implementation Method 1
electrode terminals on facing surfaces of adjacent coin cells included in the coin cell array may be connected to each other by a bonding wire
Implementation Method 2
the bonding wire may be bent in a V-shape and pressed between the adjacent coin cells
Data Source
Figure 1
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AI summary
A battery module includes a cell structure configured with a plurality of coin cell arrays each including a plurality of stacked coin cells, the plurality of coin cell arrays being arranged in an aligned manner in a transverse direction of the battery module. Tirst and second bus bars may be arranged on both sides, respectively, of the cell structure and make an electrical connection to each array. First and second end plates may be arranged on a side surface of the first bus bar and the second bus bar, respectively. First and second covers may be arranged in front of and behind, respectively, the cell structure, with which the first and second end plates, respectively, may be combined, and which cover the front and the rear sides, respectively, of the cell structure.