Battery Cell Inclined Injection Port for Electrolyte Sealing

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Solution Overview

Problem

The challenge in battery cell manufacturing is to prevent electrolyte leakage during the transfer of battery cells between various processes, which affects manufacturing efficiency and productivity.

Innovation Solution

The implementation of a battery cell design that includes a case with an electrode assembly accommodating space, a cap plate with an inclined electrolyte injection port, and a temporary sealing member with an inclined outer peripheral surface that fits into the injection port, ensuring secure sealing and preventing electrolyte leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a vertical electrolyte injection port is used, then the structure is simple, but electrolyte leakage occurs during battery cell transfer

Engineering Contradiction:

Improveelectrolyte sealingVSAvoidinjection port structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The injection port is designed with an inclined structure rather than a vertical symmetric design. The inclined port creates an asymmetric geometry where the sealing surface is angled relative to the battery cell axis, allowing the temporary sealing member to maintain contact with the port walls during transfer operations, thereby preventing electrolyte leakage.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The temporary sealing member features a curved outer peripheral surface that corresponds to the inclined angle of the electrolyte injection port. This curvature allows the sealing member to conform to the inclined port geometry, ensuring continuous contact and effective sealing throughout the battery cell transfer process.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Quantity of substance

If multiple electrolyte injection processes are performed, then complete electrolyte filling is achieved, but manufacturing time increases

Engineering Contradiction:

Improveelectrolyte filling completenessVSAvoidmanufacturing efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The temporary sealing member is pre-installed in the inclined electrolyte injection port before electrolyte injection. This preliminary action ensures that the port is properly sealed and positioned, enabling efficient electrolyte filling in a single process step without requiring multiple injection operations, thereby improving manufacturing productivity.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If the temporary sealing member is removed after electrolyte injection, then the injection port is cleared, but electrolyte leakage may occur during transfer

Engineering Contradiction:

Improveinjection port accessibilityVSAvoidelectrolyte sealing during transfer

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The temporary sealing member is designed to be dynamically removable after electrolyte injection is complete. The sealing member remains in place during injection to ensure sealing, then can be easily removed to clear the injection port for subsequent operations, providing dynamic adaptability to different manufacturing stages.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250132478A1Battery cell

Publication Date: 2025.04.24 SK ON CO LTD

AI summary

A battery cell includes a case including an electrode assembly accommodating space in which an electrode assembly and an electrolyte are accommodated, a cap plate covering the electrode assembly accommodating space, an electrolyte injection port formed as a hole penetrating through the cap plate and inclined towards the electrode assembly accommodating space, a terminal portion provided in the cap plate and connected to the electrode assembly, and a temporary sealing member having an outer peripheral surface inclined at an angle corresponding to the electrolyte injection port and inserted into the electrolyte injection port.