Battery Cell Electrode Post Layout for Injection Hole Elimination
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Solution Overview
Problem
The existing design of battery cells includes a protruding electrode post that requires a through-hole in the shell, necessitating an additional injection hole and plug, which reduces energy density and increases the risk of short-circuiting.
Innovation Solution
A battery cell design featuring a housing, insulation piece, and electrode post configuration that allows the through-hole to serve as an injection point, eliminating the need for an additional injection hole and plug, while ensuring insulation and electrical connectivity, and incorporating a meltable insulation piece for pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an additional injection hole and injection plug are provided on the shell of the battery cell, then the electrolyte solution can be injected into the battery cell, but the energy density of the battery cell is reduced due to the additional space occupation
Solution Approach 1:
The patent merges the injection hole function with the existing through-hole in the shell by positioning the electrode post at the through-hole location. The electrode post structure itself serves as the injection access point, eliminating the need for a separate injection hole and plug, thereby saving internal space and increasing energy density while maintaining electrolyte injection capability
Solution Approach 2:
The through-hole in the shell is given multiple functions: it serves as both the structural opening for the electrode post and the injection hole for electrolyte solution. This multi-functional design eliminates the need for additional dedicated injection structures, optimizing space utilization and improving energy density
2Quantity of substance
If the electrode post is disposed inside the shell without protruding, then the energy density is improved, but the electrical connection to the load becomes difficult
Solution Approach 1:
The electrode post utilizes the spatial dimension by protruding through the shell in the radial direction while its body remains positioned within the internal space. This dimensional arrangement allows the electrical connection function to extend outward for load connection while minimizing the space occupied within the battery cell interior
3Reliability
If the through-hole is sealed after shell assembly, then the shell integrity is maintained, but the electrolyte injection becomes impossible
Solution Approach 1:
The electrode post is installed in the through-hole before the shell is fully sealed and assembled. This preliminary positioning creates a built-in access pathway that remains open during assembly, allowing electrolyte injection to occur through the electrode post structure itself before final sealing, thus maintaining both shell integrity and injection capability
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 design enhances energy density by reducing internal space occupation and minimizes short-circuiting risks, while providing efficient electrolyte injection and pressure relief without additional structures.
Implementation Method 1
a melting point of the first insulation piece is T, satisfying: 100 °C ≤ T ≤ 400 °C. The first insulation piece is meltable or debondable by heat to form a pressure relief channel connecting the interior and the exterior of the battery cell
Data Source
Figure 1
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Figure 4~5
AI summary
This application provides a battery cell (10) and an electrical device. The battery cell (10) includes a housing (100), an electrode assembly (200), a housing cover (300), a first insulation piece (400), and an electrode post (500). The electrode assembly (200) is accommodated in the housing (100). The housing cover (300) is connected to the housing (100). The housing cover (300) is provided with a first through-hole (310). A first tab (210) of the electrode assembly (200) is electrically connected to the housing cover (300). The first insulation piece (400) is disposed on one side of the housing cover (300), the side facing away from the electrode assembly (200). The first insulation piece (400) is provided with a second through-hole (410). The electrode post (500) includes a body (510) and a protruding portion (520). The body (510) is sheet-shaped and disposed on one side of the first insulation piece (400), the side facing away from the housing cover (300). The protruding portion (520) runs through the first through-hole (310) and the second through-hole (410) and is electrically connected to a second tab (220) of the electrode assembly (200). In this way, the first through-hole (310) can be used as an injection hole for injecting an electrolyte solution. After completion of the injection, the electrode post (500) can seal the first through-hole (310), so that the shell of the battery cell (10) does not need to be provided with an additional injection hole, thereby saving space reserved for injection inside the shell of the battery cell (10). In addition, no injection plug is required, so that the overall space occupied by the battery cell (10) is smaller, and the energy density of the battery cell (10) is higher.