External Analyzer for Battery State Diagnosis via Junction Box
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Solution Overview
Problem
Existing battery management systems face challenges in accurately and efficiently obtaining and diagnosing battery state information, particularly in lithium-ion batteries, which affects durability and safety due to reduced charging capacity and increased risk of accidents over time.
Innovation Solution
A system comprising a first harness cable connected to a battery management system, an analyzer, and a junction box to transmit data, including voltage, temperature, and AC impedance measurements, allowing for the collection and output of state information such as SoC, SoH, SoP, and SoB, even when the BMS is not operating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery management system is used to monitor battery state, then battery safety and durability are improved, but the system complexity and cost increase
Solution Approach 1:
The patent introduces an external analyzer as an intermediary device that connects to the battery management system through a junction box and harness cable. This external analyzer performs the complex diagnostic functions and state information extraction, allowing the internal BMS to remain relatively simple while still achieving comprehensive battery monitoring and safety management.
2Measurement precision
If multiple measurement parameters (voltage, temperature, AC impedance) are collected, then measurement precision and diagnostic accuracy are improved, but the device complexity and data processing requirements increase
Solution Approach 1:
The external analyzer is designed as a multi-functional device that can perform multiple types of measurements (voltage, temperature, AC impedance) and execute various diagnostic functions through a single unified system. This consolidates multiple measurement functions into one device, reducing overall system complexity while maintaining comprehensive measurement capabilities.
Solution Approach 2:
The junction box serves as an intermediary that consolidates multiple signal lines from the battery management system into a unified interface for the external analyzer. This simplifies the connection architecture and data collection process while enabling comprehensive measurement of multiple battery parameters.
3Reliability
If the system can obtain battery state information when BMS is not operating, then reliability and diagnostic capability are improved, but the system complexity increases
Solution Approach 1:
The external analyzer is designed to independently obtain battery state information through direct connections to battery terminals via the junction box, without relying on the BMS being operational. The analyzer can perform self-service diagnostics by directly measuring voltage, temperature, and AC impedance parameters, ensuring diagnostic availability even when the BMS is inactive or malfunctioning.
Data Source
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AI summary
A system for obtaining state information of a battery may be disclosed. The system includes: at least one first harness cable for obtaining, on the basis of a CAN protocol, data indicating state information of the battery from a battery management system of the battery; an analyzer for providing a driving signal for driving the battery management system; and a first junction box for transmitting the data input through the first harness cable to the analyzer, wherein the analyzer may be configured to output the data received from the first junction box to the outside.