Electric battery unit, with battery cells in contact with a flow of a temperature-regulating liquid and with optimized flow control

A rigid hollow body with restricted passages in the inlet collector chamber of battery units addresses non-uniform temperature distribution and leakage issues, ensuring consistent flow and improved thermal management.

WO2026125986A1 Publication Date: 2026-06-18CENTRO RICERCHE FIAT SCPA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CENTRO RICERCHE FIAT SCPA
Filing Date
2025-11-19
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing battery units face issues with non-uniform temperature distribution among cells due to uneven flow of temperature-regulating liquid, leading to thermal gradients, swelling, and potential leakage, which reduces cell life and increases the risk of thermal runaway.

⚗Method used

The inlet collector chamber is defined by a rigid hollow body with restricted passages in its upper wall, independent of the housing, to control the flow of temperature-regulating liquid uniformly and prevent pressure-induced deformation of cells.

🎯Benefits of technology

Ensures uniform temperature distribution across cells, reduces thermal gradients, and prevents leakage, enhancing cell longevity and safety by maintaining consistent flow without structural stress.

✦ Generated by Eureka AI based on patent content.

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Abstract

An electric battery unit, for example a battery pack or a single module contained in a battery pack, comprises a housing (4) and a plurality of battery cells (2) within the housing (4), which are configured and arranged to come into direct contact with a flow of a temperature-regulating liquid that passes through the housing (4) for maintaining the battery cells (2) within a determined temperature range. The temperature-regulating liquid flows from an inlet collector chamber (5), which extends below the battery cells (2), through the spaces (7) between the battery cells (2) and up to an outlet collector chamber (6) which extends above the battery cells (2). The inlet collector chamber (5) communicates with the spaces (7) between the battery cells via a plurality of relatively restricted passages (9), which offer the flow of the temperature-regulating liquid sufficient resistance to prevent the temperature-regulating liquid from tending to flow to a greater extent in the spaces that are closer to the inlet and / or the outlet for the temperature-regulating liquid. The inlet collector chamber (5) is defined by the internal cavity of a rigid hollow body (50), constituting an element independent of the structure of the housing (4), disposed inside the housing (4) below the battery cells (2). The rigid hollow body (50) has an inlet (5A) for the temperature-regulating liquid and an upper wall with a distribution of apertures (9) that define said restricted passages.
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