Battery Pack Top Plate Maintains Side and End Plate Intervals
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Solution Overview
Problem
Battery packs experience deformation and a decrease in electrical characteristics due to the expansion of lithium ion battery cells during charging and discharging, leading to increased electrical resistance and rigidity issues, especially when subjected to external distortions.
Innovation Solution
A battery pack design featuring a top plate with a base frame and support frames that maintain constant intervals between end and side plates, along with a rigidity reinforcing portion and bead portions, coupled with bus bars and interconnection line guides, to enhance mechanical rigidity and prevent swelling and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery cells are connected in parallel to increase capacity and output current, then the battery pack provides higher power output, but the battery pack expands by 5 to 10% during charging causing deformation and increased electrical resistance
Solution Approach 1:
The battery pack is divided into multiple compartments separated by partition walls, with each compartment housing a subset of battery cells. This segmentation allows independent management of expansion in each section, preventing cumulative deformation across the entire pack while maintaining high capacity through parallel connection of cells across compartments.
Solution Approach 2:
Different regions of the battery pack are given different structural properties - partition walls provide rigid confinement to prevent deformation, while spacing structures provide compliant accommodation for expansion. This local differentiation allows the pack to simultaneously maintain structural integrity and accommodate volume changes during charging.
2Quantity of substance
If battery cells expand during charging, then lithium ions move and charge capacity increases, but the battery pack deformation increases electrical resistance and decreases electrical characteristics
Solution Approach 1:
Partition walls divide the battery pack into separate compartments, allowing lithium ion expansion to be contained locally within each compartment. This prevents cumulative deformation that would otherwise increase electrical resistance and degrade electrical characteristics across the entire pack.
Solution Approach 2:
Partition walls act as intermediary structures between battery cells, providing a rigid barrier that prevents cells from deforming into each other. This intermediary structure maintains proper spacing and alignment, ensuring stable electrical connections and preventing increased resistance during charging cycles.
3Adaptability or versatility
If a distortion moment is applied to the battery pack from external elements, then the battery pack is subjected to mechanical stress, but the lack of rigidity causes distortion deformation and deteriorates charging and discharging characteristics
Solution Approach 1:
The battery pack structure is segmented into rigid partition walls and compliant spacing structures. The partition walls provide the necessary mechanical rigidity to resist external distortion moments, while the spacing structures allow controlled movement to accommodate thermal and swelling effects.
Solution Approach 2:
The battery pack employs a composite structural approach combining rigid partition walls (for strength and rigidity) with compliant spacing structures (for flexibility and stress absorption). This composite design enables the pack to resist external distortion moments while maintaining charging and discharging characteristics.
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
The design effectively suppresses swelling of battery cells, maintains electrical characteristics, and provides sufficient rigidity to resist external distortions, thereby improving the performance and reliability of the battery pack.
Implementation Method 1
a top plate that maintains an interval between the end plates constant and an interval between the side plates constant
Implementation Method 2
a pair of end plates arranged to face each other; a plurality of battery cells arranged between the end plates in a first direction; a pair of side plates that cover facing side surfaces of the battery cells
Implementation Method 3
the bending portion may have a connection coupling member that is coupled to a through-hole coupling member passing through the first and second side plates
Data Source
AI summary
A battery pack that has end plates and side plates so as to define an opening. The end plates and side plates are interconnected to inhibit swelling of the batteries in direction of the end plates. The battery pack includes a top plate that is interconnected to the side plates so as to maintain an interval between the side plates to inhibit swelling of the batteries in the direction of the side plates.