Pouch Cell Battery Pack Assembly With Accessible Welded Tabs
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Solution Overview
Problem
Existing battery packs for electrically driven treatment apparatuses, such as gardening and forestry tools, face challenges in simple and efficient production and connection of pouch cells due to complex structural designs and inaccessible cell tabs.
Innovation Solution
A battery pack design featuring pouch cells with cell tabs projecting beyond the housing edge, allowing for direct electrical and mechanical connections via welded connections, facilitated by a stack housing with a common opening and a frame for easy access and positioning of circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cell tabs are enclosed within the stack housing, then the battery pack structure is compact and protected, but the cell tabs become difficult to access for electrical connections
Solution Approach 1:
The cell tabs are extracted from the enclosed stack housing structure and allowed to project outward through the housing opening. This extraction enables direct access to the tab parts for welding operations while maintaining the protective enclosure of the stack housing for the battery cells themselves.
Solution Approach 2:
The cell tabs extend in multiple spatial dimensions - projecting outward from the stack housing through the housing opening. This dimensional arrangement allows the tab parts to be accessible from the outside while the battery cells remain enclosed, solving the accessibility problem without compromising structural protection.
2Ease of manufacture
If cell tabs are made accessible for easy connection, then production is simplified, but the structural integrity and protection of the battery cells may be compromised
Solution Approach 1:
The battery pack structure is segmented into distinct functional zones: the stack housing encloses and protects the battery cells, while the housing opening provides an access path for the cell tabs. This segmentation allows the connection area to be accessible while the cell storage area remains protected and enclosed.
Solution Approach 2:
The housing opening acts as an intermediary element that mediates between the enclosed cell tabs and the external connection environment. It allows the tab parts to project outward for easy access while maintaining the protective barrier of the stack housing for the battery cells.
3Reliability
If multiple cell tabs are directly connected via welding, then electrical connection reliability is improved, but the production time and complexity increase
Solution Approach 1:
The cell tabs are pre-positioned and allowed to project outward through the housing opening during the stacking process. This preliminary arrangement ensures that the tab parts are already in the optimal position for welding operations, eliminating the need for additional positioning steps and enabling direct welding connections.
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
Enables simple and efficient production and connection of pouch cells, enhancing the structural design and electrical connectivity of battery packs for electrically driven treatment apparatuses.
Implementation Method 1
the tab parts, in particular in each case, of next pouch cells are directly electrically connected to each other by welded connections
Implementation Method 2
the tab parts, in particular in each case, of next pouch cells are directly electrically connected to each other by welded connections
Data Source
AI summary
A battery pack supplies an electrically driven treatment apparatus with an electric driving power. The battery pack includes: a stack housing, wherein the stack housing has a common housing opening defined by a housing edge, and a plurality of pouch cells, wherein the pouch cells have cell tabs and are configured and disposed in a stack within the stack housing such that the cell tabs at least with tab parts on the common housing opening project beyond at least one edge portion of the housing edge. The tab parts are directly electrically connected to each other by welded connections.