Battery Pack Bus Bar Terminal Positioning for Compact Design
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Solution Overview
Problem
Conventional battery packs with integrally configured bus bars and electrode tabs have limited design flexibility, making it difficult to connect terminal members from all directions, resulting in increased device size and welding space requirements.
Innovation Solution
The battery pack design features a flat bus bar connected to electrode tabs of unit cells, with the terminal joining position positioned away from the bus bar and electrode tab joining positions, allowing for reduced device size and simplified welding by aligning all joining points on the same surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal joining position is disposed at a different position from the joining position between the bus bar and the electrode tabs, then design flexibility for connecting terminal members is improved, but device size increases
Solution Approach 1:
The patent utilizes the surface dimension of the bus bar to separate joining positions. By disposing the terminal joining position and electrode tab joining position at different locations on the same surface, the invention achieves design flexibility without increasing device volume, effectively applying dimensional arrangement to resolve the contradiction.
2Ease of operation
If the terminal joining position is disposed at a different position from the joining position between the bus bar and the electrode tabs, then connection accessibility from all directions is improved, but welding space requirements increase
Solution Approach 1:
The invention arranges joining positions on the two-dimensional surface of the bus bar, allowing terminal members to be connected from different directions along the surface without requiring additional three-dimensional welding space, thus improving accessibility while controlling welding space requirements.
3Ease of manufacture
If the bus bar and electrode tabs are integrally configured, then manufacturing simplicity is improved, but design flexibility for terminal connection is reduced
Solution Approach 1:
The invention segments the bus bar into distinct functional zones: one area for electrode tab joining and another area for terminal member joining. This segmentation allows the bus bar to maintain its integral structure for manufacturing simplicity while providing separate optimized regions for different connection purposes, thereby achieving design flexibility.
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 reduces the device size and welding space requirements, improves manufacturing efficiency by allowing welding on a single plane, and maintains effective electrical connections between the bus bar, electrode tabs, and terminal members.
Implementation Method 1
The bus bar is formed into a flat plate shape and joined to the electrode tabs of the unit cells, and it electrically connects the electrode tabs of at least two of the unit cells with each other
Implementation Method 2
The terminal member is joined to the bus bar and relays the input and output of electric power in the cell group
Data Source
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AI summary
[PROBLEM] To provide a battery pack capable of reducing the size of a device. [SOLUTION] The battery pack 100 comprises a cell group 100G, a bus bar 131, and a terminal member (anode side terminal 133 or cathode side terminal 134). The cell group 100G is obtained by stacking, in the thickness direction, a plurality of unit cells 110 provided with a cell body 110H, which includes a power generation element 111 and is formed into a flat shape, and an electrode tab 113 protruding out from the cell body, and the electrode tabs 113 are arranged along the stacking direction. The bus bar is formed into a flat plate shape and joined to the electrode tabs of the unit cells, and it electrically connects the electrode tabs of at least two of the unit cells with each other. The terminal member is joined to the bus bar and relays the input and output of electric power in the cell group. Here, the battery pack is configured such that a terminal joining position where the terminal member is joined to the bus bar is disposed away from the joining position between the bus bar and the electrode tabs, when viewing the surface on which the electrode tabs are arranged in the cell group from a direction that is orthogonal to the surface.