Detachable Cell Module Case for Sealed Battery Maintenance

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Solution Overview

Problem

Conventional liquid-cooling PACK and cell modules are un-maintainable due to the integration of the case cover and case body through potting or bonding, making it impossible to access and repair the cells inside.

Innovation Solution

A case design with a housing and a detachable upper cover featuring maintenance openings, sealant, buckle structures, and airtight detection, allowing for easy access and repair of cells while maintaining a sealed environment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the case cover and case body are integrated by potting or bonding, then the sealing and structural integrity are improved, but the maintainability deteriorates as the case cover cannot be opened for cell repair

Engineering Contradiction:

Improvesealing integrityVSAvoidcell maintainability

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The case is divided into a case body and a detachable case cover that can be separated. The case cover is designed to be removable from the case body, allowing cells to be accessed for maintenance while maintaining sealing integrity when closed. This segmentation enables both reliable sealing during operation and easy repair during maintenance cycles.

Inventive Principle:

Principle #1Segmentation

2Ease of repair

If the case cover is made detachable for maintenance access, then the ease of repair is improved, but the sealing reliability deteriorates due to potential gaps and contamination

Engineering Contradiction:

Improvecell maintainabilityVSAvoidsealing integrity

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

A sealing structure acts as an intermediary element between the case body and case cover. This sealing mechanism ensures that when the case cover is detached for maintenance and reattached, the sealing integrity is maintained, preventing contamination and gaps. The intermediary sealing structure resolves the conflict between detachability and sealing reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If maintenance openings are provided for cell repair, then the ease of operation is improved, but the protection against harmful factors deteriorates due to potential foreign material entry

Engineering Contradiction:

Improvemaintenance accessibilityVSAvoidforeign material contamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The case cover transitions between two dynamic states: closed during normal operation to protect against foreign material contamination, and open during maintenance to provide access for cell repair. This dynamic design allows the system to adapt its protection level based on operational requirements, maintaining both ease of operation and protection against harmful factors at different times.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4576369A1Case and cell module having the same

Publication Date: 2025.06.25 SUNGROW POWER SUPPLY CO LTD

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AI summary

A case used for storing cells includes a housing (10) and an upper cover (20). The housing (10) is provided with an accommodation chamber (11), a maintenance opening (12) is formed at a top of the housing (10), and the maintenance opening (12) is in communication with the accommodation chamber (11). The accommodation chamber (11) is used for accommodating the cells, and the maintenance opening (12) is arranged corresponding to the cells. The upper cover (20) is detachably arranged on the housing (10) and is able to cover the maintenance opening (12).