Battery Cell Electrode Terminal Structure for Shared Casing Space
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Solution Overview
Problem
Existing battery cell designs face challenges in maximizing energy density due to the protrusion of electrode terminals, which increases the size of the battery cell and reduces space utilization within the casing, leading to lower energy density.
Innovation Solution
The design incorporates a casing with a first electrode terminal that is convexly arranged on a surface intersecting the direction of the casing, allowing it to connect with the electrode assembly without protruding, thereby sharing space and optimizing the battery cell's size and energy density. This design includes specific geometric configurations, such as angles and surface orientations, to balance capacity and overcurrent capacity, and includes notches for terminal installation, ensuring efficient space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal is arranged to protrude from the casing for electrical connection, then the electrical connection function is improved, but the battery cell size increases and effective volume utilization decreases
Solution Approach 1:
The first surface is designed to intersect with the first direction (the direction perpendicular to the outer side surface), creating a dimensional transition that allows the electrode terminal to be mounted on this intersecting surface rather than protruding from the outer side surface, thereby achieving electrical connection without increasing the battery cell size in the first direction
Solution Approach 2:
The electrode terminal is nested within the space defined by the intersecting first surface, utilizing the angular configuration to fit the terminal within the existing envelope of the battery cell rather than extending beyond it
2Ease of manufacture
If the first surface is made larger to accommodate the electrode terminal, then the terminal installation space is improved, but the battery cell capacity decreases due to wasted external space
Solution Approach 1:
The first surface is designed with an asymmetric angular configuration relative to the outer side surface, creating an optimized mounting area for the electrode terminal that does not require symmetric expansion of the battery cell envelope, thus avoiding waste of external space while providing sufficient installation area
Solution Approach 2:
The angle θ between the first surface and the outer side surface is optimized within the range of 120°-150° to balance the available space for electrode terminal installation with the overall capacity of the battery cell, achieving an optimal compromise between terminal accommodation and energy storage
Data Source
AI summary
The embodiments of the present application provide a battery cell, a method and system for manufacturing a battery cell, a battery and an electrical device. The battery cell of the embodiment includes an electrode assembly, a casing, and a first electrode terminal. The casing is for accommodating the electrode assembly, an outer surface of the casing includes an outer side surface parallel to a first direction and a first surface connected with the outer side surface, the outer side surface is arranged surrounding the electrode assembly, the first surface intersects the first direction. The first electrode terminal is convexly arranged on the first surface and for electrically connecting with the electrode assembly, the first electrode terminal does not protrude, in the first direction, from an outermost end of the first surface along the first direction.