Battery Cell Electrode Post Structure for Plug-Free Electrolyte Filling
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Solution Overview
Problem
The existing design of battery cells requires additional injection holes and plugs for electrolyte injection, reducing energy density due to occupied space and protruding components.
Innovation Solution
A battery cell design with a housing, insulation piece, and electrode post configuration that allows the first through-hole to serve as an injection hole, eliminating the need for additional injection holes and plugs, while ensuring insulation and electrical connectivity through a protruding portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If additional injection holes and plugs are provided on the shell for electrolyte injection, then the injection function is achieved, but the energy density is reduced due to occupied space and protruding components
Solution Approach 1:
The patent combines the injection hole function with the existing through-hole in the housing cover, eliminating the need for separate injection holes and plugs. The electrode post body is positioned to enable electrolyte injection through the through-hole, merging multiple functions into a single structural element, thereby saving space and increasing energy density
Solution Approach 2:
The through-hole in the housing cover serves multiple functions: it acts as both a structural passage for the electrode post and an injection hole for electrolyte filling. This multi-functional design eliminates redundant components and optimizes the use of available space within the battery cell
2Device complexity
If the electrode post is directly connected to the housing cover without insulation, then electrical connectivity is simplified, but short-circuiting risk increases
Solution Approach 1:
The patent introduces an insulation piece as an intermediary component between the electrode post and the housing cover. This insulation piece prevents direct electrical contact that could cause short-circuiting, while still allowing the electrode post to pass through the housing cover. The intermediary component resolves the contradiction by providing both electrical isolation and structural support
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
Increases energy density by reducing internal space usage and preventing short-circuiting, with enhanced safety and pressure relief features.
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
AI summary
A battery cell includes a housing, an electrode assembly, a housing cover, a first insulation piece, and an electrode post. The electrode assembly is accommodated in the housing. The housing cover is connected to the housing. The housing cover is provided with a first through-hole. A first tab of the electrode assembly is electrically connected to the housing cover. The first insulation piece is disposed on one side of the housing cover, the side facing away from the electrode assembly. The first insulation piece is provided with a second through-hole. The electrode post includes a body and a protruding portion. The body is sheet-shaped and disposed on one side of the first insulation piece, the side facing away from the housing cover. The protruding portion runs through the first through-hole and the second through-hole and is electrically connected to a second tab of the electrode assembly.