Battery Pack Pressure Relief Structure for Unblocked Gas Discharge
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Solution Overview
Problem
Existing battery packs lack a pressure relief mechanism, leading to a risk of explosion due to the absence of channels for gas release during pressure buildup.
Innovation Solution
A battery pack design incorporating a spacer with an air vent between the cell assembly and the housing, along with a pressure relief part on the housing, ensures a gas discharge path is maintained without obstructing the glue fixation, using air-permeable materials for the spacer and allowing gas to escape through designated channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glue is filled around the cell assembly to fix it in the housing, then the cell assembly is securely fixed, but the pressure relief channel is blocked and explosion risk increases
Solution Approach 1:
The space around the cell assembly is segmented into two zones: a glue-filled zone for fixation and a glue-free zone for pressure relief. The spacer physically divides the accommodating cavity into a first region (where glue is filled for fixation) and a second region (where no glue is filled, maintaining pressure relief channels). This segmentation allows both strong fixation and safe pressure relief coexist without contradiction.
Solution Approach 2:
The spacer acts as an intermediary component between the cell assembly and the housing. It serves multiple functions: (1) maintaining the gap between the cell assembly and housing, (2) defining the boundary of the glue-free zone, (3) providing structural support, and (4) ensuring pressure relief channels remain open. The spacer mediates between the need for strong fixation (glue) and the need for pressure relief (open channels).
2Ease of manufacture
If no spacer is used and glue is filled completely, then manufacturing is simpler, but gas discharge path is blocked
Solution Approach 1:
The spacer is pre-installed in the accommodating cavity before the glue filling process. This preliminary action establishes the boundaries of the glue-free zone in advance, ensuring that when glue is subsequently filled, it automatically stops at the spacer and cannot block the pressure relief channels. The spacer performs the preliminary action of defining the safe zone before the harmful action (glue filling) occurs.
3Reliability
If a pressure relief structure is added to the housing, then explosion risk is reduced, but device complexity increases
Solution Approach 1:
The spacer is designed as a multi-functional component that simultaneously serves as: (1) a structural support element, (2) a spacer maintaining gaps, (3) a boundary marker for glue filling, and (4) an integral part of the pressure relief system. By making the spacer multi-functional, the patent avoids adding separate complex pressure relief structures, thus reducing overall device complexity while maintaining reliability.
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
The design effectively prevents glue obstruction in the gas discharge path, enhancing structural shock resistance and ensuring safe gas release, thereby reducing the risk of explosion.
Implementation Method 1
a spacer, arranged between a first side of the cell assembly and the housing and provided with an air vent
Implementation Method 2
The top seal is provided with at least one weak region enabling gas in the cell body to flow out of the cell body when the weak region is impacted by the gas
Data Source
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AI summary
Disclosed by the application is a battery pack with a pressure relief structure, including: a housing, provided with an accommodating cavity; a cell assembly, accommodated in the accommodating cavity; a spacer, arranged between a first side of the cell assembly and the housing and provided with an air vent; a pressure relief part, arranged on the housing, the pressure relief part being in contact with the spacer or an air channel being formed therebetween; and glue, filled in a gap between at least partial regions outside the first side of the cell assembly and the housing and used for fixing the cell assembly and the housing. The battery pack is provided with the spacer with the air vent, the spacer is arranged between the first side of the cell assembly and the housing, and the glue is filled in the gap between at least partial regions outside the first side of the cell assembly and the housing, so that no glue exists between the spacer and the cell assembly and a pressure relief channel for gas is formed. The housing is provided with the pressure relief part which is in contact with the spacer or has an air channel therewith, so that no glue exists between the spacer and the cell assembly and the pressure relief channel for gas is formed. Gas in the cell assembly is discharged out of the battery pack through the pressure relief channel, the air vent and the pressure relief part.