Secondary Battery Electrolyte Injection Hole Design

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Solution Overview

Problem

The existing secondary battery design is prone to deformation and structural damage during electrolyte injection due to excessive impact force on the electrode assembly's end surface, which can lead to reduced safety and reliability.

Innovation Solution

The design incorporates a casing with a first through hole and a second through hole, where the electrolyte flows through both holes to slow down its velocity, reducing the impact force on the electrode assembly's end surface, and includes a sealing member and a protective member to prevent direct electrolyte contact with the tabs and end surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the injection pressure of the electrolyte is increased to improve injection efficiency, then the injection efficiency is improved, but the end surface of the electrode assembly will be deformed due to excessive impact force

Engineering Contradiction:

Improveinjection efficiencyVSAvoiddeformation of end surface

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

A protective member is introduced as an intermediary element between the electrolyte injection hole and the electrode assembly. This protective member intercepts the electrolyte flow and prevents direct impact on the electrode assembly, allowing high injection pressure to be used without causing deformation to the end surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the injection pressure of the electrolyte is increased to improve injection efficiency, then the injection efficiency is improved, but the structural damage to the electrode assembly increases

Engineering Contradiction:

Improveinjection efficiencyVSAvoidstructural damage

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The protective member serves as a mediator that absorbs and redirects the electrolyte flow. It is positioned to receive the electrolyte from the injection hole and guide it into the battery cavity, preventing direct structural impact on the electrode assembly while maintaining efficient injection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective member is pre-installed in position to cushion and mitigate the impact force of the electrolyte before it reaches the electrode assembly. This beforehand protection prevents structural damage during the injection process.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Manufacturing precision

If a protective member is added to prevent direct electrolyte contact with the electrode assembly, then the deformation and structural damage are reduced, but the device complexity increases

Engineering Contradiction:

Improvedeformation of end surfaceVSAvoidstructure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The protective member is designed as a thin-walled structure that provides effective protection against electrolyte impact while minimizing material usage and structural complexity. The thin-walled design allows it to be simple in form yet effective in function.

Inventive Principle:

Principle #30Flexible shells and thin films

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 configuration minimizes the risk of deformation and structural damage to the electrode assembly, enhancing the safety and reliability of the secondary battery by reducing the impact force during electrolyte injection.

Implementation Method 1

a sealing member connected to the casing and configured to seal the first through hole

Methodology Applied

Scientific EffectSealing:

Implementation Method 2

the electrolyte flows through both holes to slow down its velocity, reducing the impact force on the electrode assembly's end surface

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentEP3726626B1Secondary battery and battery module

Publication Date: 2022.02.23 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

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AI summary

The present disclosure relates to a secondary battery and a battery module. The secondary battery includes: a casing having a receiving cavity and an opening which is in communication with the receiving cavity; an electrode assembly housed in the casing; a first top cover plate, which covers the opening and is connected with the casing, the first top cover plate including an insertion portion extending into the casing and an exposed portion disposed outside the casing; and a sealing member; the casing is provided with a first through hole, the insertion portion is provided with a second through hole, the second through hole includes an inlet which is in communication with the first through hole and an outlet which is in communication with the receiving cavity, and the sealing member is connected to the casing and seals the first through hole. The secondary battery according to the present disclosure can reduce the possibility of deformation and displacement of the end surface caused by the impact force applied to the end surface of the electrode assembly during the liquid injection process.