Battery Case Partition Wall for Directed Cell Gas Venting
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Solution Overview
Problem
Existing electric power storage apparatuses do not effectively control the path of gas discharged from cells to a pressure relief valve, potentially leading to unwanted contact with electronic components.
Innovation Solution
The apparatus includes a partition wall that partitions the case into an accommodation chamber and a non-accommodation chamber, with a specific opening facing the space between stacks, directing gas to a pressure relief valve in the non-accommodation chamber, and a respiratory membrane to manage pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is discharged from electric power storage cells without a partition wall, then the gas can reach the pressure relief valve freely, but the gas may contact electronic components and cause damage
Solution Approach 1:
The case is segmented into an accommodation chamber for battery stacks and a non-accommodation chamber for electronic components by a partition wall. This segmentation prevents gas discharged from battery cells in the accommodation chamber from reaching electronic components in the non-accommodation chamber, while still allowing gas to reach the pressure relief valve through a controlled path via an opening in the partition wall.
2Reliability
If a partition wall is added to restrict gas path, then electronic components are protected from gas contact, but the device structure becomes more complex
Solution Approach 1:
The case is divided into two chambers by a partition wall with an opening, creating a simple yet effective barrier that guides gas flow while protecting electronic components.
Solution Approach 2:
The partition wall acts as an intermediary structure between the accommodation chamber and non-accommodation chamber, controlling gas flow through its opening while preventing direct contact between gas and electronic components.
3Reliability
If the partition wall completely seals the accommodation chamber, then gas is fully isolated from electronic components, but gas cannot reach the pressure relief valve
Solution Approach 1:
The partition wall has different properties at different locations: it is solid and sealing at most areas to block gas flow, but has a localized opening to allow gas passage to the pressure relief valve. This local quality differentiation enables both protection and functional operation.
Data Source
AI summary
An electric power storage apparatus includes: a plurality of first electric power storage stacks; a plurality of second electric power storage stacks; a case; and a pressure relief valve. The case includes a case body and a partition wall. The partition wall partitions the inside of the case body into an accommodation chamber and a non-accommodation chamber. The partition wall includes a contact end face configured to come into contact with the inner surface of the case body, and an opening. The pressure relief valve is provided at a portion of the non-accommodation chamber. The portion faces the opening in the first direction.