BMS Relay Communication for Long Harness Signal Integrity

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Solution Overview

Problem

In vehicles with multiple battery casings, the battery management unit (BMU) and cell supervision circuit (CSC) cannot be installed in the same area due to layout constraints, leading to excessively long communication wiring harnesses that cause signal distortion.

Innovation Solution

A communication method for a battery management system (BMS) that includes a relay unit connected to a same communication network with the BMU and CSC, performing enhancement processing on battery status and instruction information to reduce attenuation and extend transmission distance, alleviating signal distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the communication wiring harness between BMU and CSC is made longer to accommodate different battery casing layouts, then the adaptability to different vehicle configurations is improved, but signal distortion occurs

Engineering Contradiction:

Improveadaptability to different battery casing layoutsVSAvoidsignal quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a relay unit as an intermediary device in the communication network between BMU and CSC. This relay unit receives signals from one component, performs enhancement processing, and transmits to the other component, thereby mediating the signal transmission over long distances and preventing signal distortion while accommodating flexible battery casing layouts

Inventive Principle:

Principle #24Intermediary (Mediator)

2Area of stationary object

If the communication wiring harness is extended to connect BMU and CSC in vehicles with multiple battery casings, then the coverage area is improved, but signal attenuation increases

Engineering Contradiction:

Improvecoverage area of communication networkVSAvoidsignal attenuation

Core Design Contradiction:

Area of stationary objectVSLoss of energy

Solution Approach 1:

The relay unit acts as a signal regeneration station in the communication network, receiving attenuated signals from distant CSC or BMU, performing enhancement processing to restore signal strength, and retransmitting the enhanced signals, thereby extending the effective coverage area while compensating for signal attenuation over long distances

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The relay unit performs enhancement processing that involves changing signal parameters such as amplitude and baud rate adaptation. By adjusting these parameters, the relay unit compensates for signal attenuation and extends the effective transmission distance, allowing the communication network to cover larger areas with multiple battery casings

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4691842A1Battery management system communication method, battery management system, electronic device, and medium

Publication Date: 2026.02.11 EVE ENERGY CO LTD

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AI summary

A communication method for a battery management system (BMS), a BMS, an electronic device, and a medium. The communication method for the BMS includes receiving battery status information from a cell supervision circuit (CSC); performing enhancement processing on the battery status information to obtain enhanced battery status information; and transmitting the enhanced battery status information to a battery management unit (BMU) so that the BMU controls the operating condition of a battery based on the enhanced battery status information.