Battery management system for an electric battery, and method for monitoring the operation of an electric battery

The forwarding transmission method in battery management systems enables reliable and efficient data packet transfer from cell monitoring units to the control unit, even in challenging radio connection scenarios, thereby addressing the limitations of current BMS technologies.

WO2025056367A1 Publication Date: 2025-03-20SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Application Number
PCT/EP2024/074567
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-11
Filing Date
2024-09-03
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

Current battery management systems (BMS) face challenges in reliably and efficiently transmitting data packets from cell monitoring units to the control unit, especially in scenarios with large distances or impaired radio connection quality, which can lead to increased data transfer times and reduced reliability.

Method used

The proposed solution involves a forwarding transmission method where data packages from cell monitoring units are initially transferred to another cell monitoring unit acting as a forwarding unit, and then forwarded to the control unit in a second step, thereby enhancing data transfer reliability and efficiency.

Benefits of technology

This approach allows for reliable and rapid data packet transmission even when cell monitoring units are far from the control unit or have poor radio connections, addressing the limitations of current wireless transmission technologies and ensuring consistent performance in battery management systems.

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Abstract

The invention relates to a battery management system (20) for monitoring the operation of an electric battery (10) formed from battery cells (12) which are electrically interconnected, said battery management system comprising a plurality of cell monitoring units (30) and a control device unit (40), wherein the cell monitoring units (30) are each designed to generate a data packet relating to an operating state of the allocated battery cells (12), wherein the control device unit (40) is designed to evaluate the data packets generated by the cell monitoring units (30), and wherein the cell monitoring units (30) and the control device unit (40) are each provided with a radio apparatus (36, 46) and are designed to perform data transmission with the aid of the radio apparatuses (36, 46), by way of which data transmission the data packets generated by the cell monitoring units (30) are transmitted from the cell monitoring units (30) to the control device unit (40). In order to enable particularly reliable and quick transmission of the data packets, the invention proposes that for at least one of the cell monitoring units (30), the data packet generated by said cell monitoring unit (30) is transmitted, in a first step, to another of the cell monitoring units (30) and, in a subsequent second step, is transmitted from the cell monitoring unit (30) in question to the control device unit (40). The invention further relates to a corresponding method for monitoring the operation of an electric battery (10).
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