Battery Case Upper Bonding Fold for Electrode Length
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lithium ion polymer batteries have limited power storage capacity and output due to restricted length of the battery case, which restricts the size of the electrode assembly, and existing folding mechanisms do not ensure adequate sealing and safety.
Innovation Solution
The battery case is designed with an upper bonding portion folded toward the upper end, side bonding portions folded inward, and inner corners with large radii of curvature to increase the length of the electrode assembly and enhance sealing, while cutting off common portions to prevent injury and maintain decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper bonding portion is extended along the longitudinal direction to seal the battery case, then the sealing reliability is improved, but the length available for the electrode assembly is reduced, decreasing the power storage capacity
Solution Approach 1:
The upper bonding portion is folded toward the upper end of the battery case, changing the spatial arrangement from a linear extension along the longitudinal direction to a folded configuration. This dimensional reorganization allows the bonding portion to provide sealing while freeing up longitudinal space for the electrode assembly, thereby resolving the contradiction between sealing reliability and power storage capacity.
Solution Approach 2:
The battery case is divided into upper and lower bodies that are separated and then bonded together through the folded upper bonding portion. This segmentation allows the sealing function to be distributed to the bonding portion while the main bodies can accommodate longer electrode assemblies, thus improving both sealing reliability and power storage capacity.
2Quantity of substance
If the upper bonding portion is folded toward the upper end to increase electrode assembly length, then the power storage capacity is improved, but the sealing capacity may be compromised
Solution Approach 1:
By folding the upper bonding portion toward the upper end rather than extending it linearly, the patent creates additional space in the longitudinal direction for the electrode assembly while maintaining the sealing function through the folded configuration. This dimensional change ensures both increased power storage capacity and maintained sealing capacity.
Solution Approach 2:
The upper bonding portion is pre-formed with extended portions along both sides and the upper end before assembly. This preliminary preparation allows the bonding portion to be folded and bonded in a controlled manner that ensures proper sealing while maximizing the space available for the electrode assembly.
3Ease of operation
If the common portions of the upper bonding portion and side portions are cut off to enable folding, then the ease of operation is improved, but the sealing capacity is reduced
Solution Approach 1:
The upper bonding portion is segmented into common portions (at the corners) and non-common portions. The common portions are cut off to enable easy folding and assembly operations, while the non-common portions retain sufficient length to provide adequate sealing capacity. This segmentation resolves the contradiction between ease of operation and sealing capacity.
Solution Approach 2:
Different portions of the upper bonding portion have different treatments: the common portions at the corners are cut off to facilitate folding, while the main body of the bonding portion maintains its integrity for sealing. This local differentiation allows the structure to simultaneously achieve ease of operation and adequate sealing capacity.
Data Source
AI summary
The present invention provides a battery having a structure for increasing the power storage capacity and output thereof In accordance with the present invention, in a battery comprising an electrode assembly including anode plates, cathode plates and separators; and a battery case, both side bonding portions of which are folded toward adjacent sides thereof, for accommodating the electrode assembly and a designated amount of electrolyte, and sealing the electrode assembly such that two electrode terminals connected to corresponding electrode taps of the anode and cathode plates of the electrode assembly are exposed to the outside, an upper bonding portion of the battery case is folded toward the upper end of the battery case, and/or common portions of the upper bonding portion and both side portions of the battery case are cut off, and/or inner corners corresponding to the upper bonding portion have larger radiuses of curvature, and/or receipt portions for receiving the electrode assembly are respectively formed in upper and lower bodies of the battery case. The battery having the above structure has high power storage capacity and output at the same size of the battery package, and high sealing capacity and safety.