Techniques to Reduce Cascading Failure in EV Battery Cells

Redundant battery management system architecture for electric vehicles that enables fault-tolerant operation under load conditions. The system comprises two battery management systems (BMS) that communicate with each other and with the vehicle's electrical control system. Each BMS monitors its own state and the state of its paired BMS, determining operating limits based on both individual battery health and system performance metrics. The system then dynamically adjusts system parameters to maintain safe operating conditions, including torque levels, voltage levels, and motor performance. This architecture enables the vehicle to continue operating safely even when one BMS fails, while the other BMS continues to manage the vehicle's electrical systems.

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Operating a battery system for electric vehicles that allows fault tolerance without sacrificing capacity or redundancy. The battery system has parallel strings, each with one or more modules containing series-connected cells. Cells and modules can be selectively switched on/off. If a cell fault occurs, only the faulty cell is disconnected. The string with the faulty cell is not switched off. Instead, it's charged from the other strings during regenerative braking until voltage equalization. This avoids wasting intact cells and maintains capacity.

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Battery management system for electric vehicles that detects and controls battery degradation through advanced monitoring of state-of-charge (SOC) and voltage conditions. The system employs a unique switching strategy that identifies battery cells with the lowest state-of-charge values when voltage conditions are detected, and connects these cells to the positive terminal. This approach enables proactive management of battery health by prioritizing cells with the most critical state-of-charge values during charging and discharging phases.

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High-voltage battery system for commercial vehicles that enables selective isolation of critical segments through dynamic monitoring of insulation resistance. The system employs a hierarchical power distribution architecture with separate segments connected by switchable connecting lines. An insulation monitor continuously monitors the system's insulation resistance, triggering segment disconnection when the value falls below predetermined thresholds. This selective isolation enables targeted maintenance and shutdown of critical segments while maintaining system integrity. The system can be configured to prioritize high-priority segments, with lower-priority segments automatically disconnected in case of insulation failure.

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Operating a battery system for electric vehicles that enables fault-tolerant operation by dynamically managing voltage levels across the battery pack. The system comprises battery modules connected in parallel, with each module comprising battery cells connected in series and/or parallel. The battery pack is divided into independent strands, each with its own battery modules, allowing for independent control of each strand. The system detects faults in individual battery cells and modules, and automatically adjusts voltage levels across the pack to maintain optimal operating conditions. This enables fault-tolerant operation while maintaining the pack's overall voltage level, allowing for reliable traction supply even in the presence of individual cell or module faults.

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A power management system for energy storage power stations that enables efficient operation of short-board cells by isolating them from the main battery pack. The system comprises a circuit with two contacts for each battery cell, where one of the contacts is connected between the positive and negative terminals of each cell. This configuration enables the removal of a short-board cell without powering down the entire battery pack, while maintaining system safety.

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Operating a battery system with enhanced fault detection capabilities through a novel method that compares battery cell measurements across module and pack levels. The system employs both module-internal monitoring units and pack-level analysis to detect anomalies in battery cell voltages, state of charge, and overall system performance. By comparing measurements from both levels, the system can identify potential module-level faults before they propagate to the pack level, enabling early detection and potential corrective action.

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Battery system safety isolation device and control method for electric vehicles through complex network control. The device integrates battery packs into a power system through series and parallel connections, with each pack connected in parallel to a backup circuit. The system comprises current sensors, control switches, and backup switches for each pack, along with vehicle load and battery management systems. The device monitors battery voltage, current, and temperature data against predefined thresholds to identify faults. The control switches and backup switches are automatically controlled to isolate the faulty battery, preventing system-wide failure and enabling precise fault isolation.

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Standardized safety evaluation framework for power batteries in cascade utilization, addressing the unique challenges of long-duration battery operation. The method assesses battery performance under controlled conditions before deployment, leveraging standardized testing protocols to evaluate degradation patterns and environmental influences. This comprehensive approach enables the development of reliable safety standards for cascaded battery applications, ensuring the long-term reliability and safety of battery systems.

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A wireless multi-agent-based battery management system that enables real-time monitoring of individual battery states, in-situ temperature measurement, and automatic isolation of faulty batteries in battery packs. The system employs wireless communication through multiple agents to collect and transmit data from individual batteries, while maintaining precise temperature monitoring and real-time fault detection capabilities. This enables independent battery management and control, with each battery able to operate independently without affecting the overall system.

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Battery management system for cascade battery systems that enables independent module failure detection and replacement while maintaining system operation. The system comprises isolated DC-DC converters for each battery module, which are connected in parallel to the DC bus. Each module is connected to an isolated DC-DC converter that is also connected to the DC bus. The battery management unit monitors the state of charge and health of all modules, and when a module fails, it can independently replace the faulty module without disrupting system operation. This enables the system to maintain power output while addressing module failures through selective replacement.

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Distributed battery management system for automotive power systems that enables fault-tolerant operation by dynamically disconnecting power supplies from affected components when a single point of failure occurs. The system monitors sub-power supply systems and their associated loads, detects component failures, and automatically disconnects power supplies from the affected components while maintaining system safety. This approach prevents cascading failures by isolating the affected power supply from the entire system, thereby preserving critical electrical loads and preventing overall system failure.

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A single-string metering protection board for mobile power supplies that eliminates the need for battery curve learning and charging/discharging processes. The board integrates a battery cell, power metering module, charging device, and protection module into a single unit. The battery cell is connected to the power metering module, which is then connected to the charging device. The protection module is connected to the battery cell, and the board automatically monitors and controls the battery cell's state of charge and voltage. This eliminates the need for battery curve learning and charging/discharging processes, reducing production time and cost while maintaining accurate battery state of charge monitoring.

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Energy storage system with fault isolation capability that enables continuous operation without system-wide shutdown. The system comprises a battery pack with multiple cells connected in series and/or parallel, along with a monitoring module that continuously tracks battery health parameters. When a cell fails, the monitoring module automatically isolates the faulty cell without requiring system-wide shutdown, allowing the system to continue operating while the faulty cell is repaired. The monitoring module employs advanced algorithms to detect and isolate faults, ensuring uninterrupted energy supply while maintaining system safety.

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A lithium-ion battery management system with advanced protection and power measurement capabilities for multi-string batteries. The system integrates comprehensive protection functions, including temperature management, overcurrent protection, and voltage regulation, while providing accurate power measurement through precise current and voltage monitoring. This enables reliable battery operation across multiple string configurations, with enhanced safety features and precise energy management.

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Battery management system for electric vehicles that enables rapid detection of battery faults through integrated monitoring of individual battery cells. The system comprises a battery control unit that continuously monitors each battery cell in the string, and a module control unit that controls the battery modules within the string. When a cell's current exceeds predetermined limits, the control unit sends a wake-up signal to the battery control unit, which automatically disconnects the affected string. This enables quick and efficient fault detection and isolation of battery cells, reducing overall system downtime and improving overall system reliability.

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Power battery management system for electric vehicles that enables rapid fault detection and removal of series battery packs. The system employs a unique approach where the faulty series pack is disconnected from the remaining healthy packs, allowing complete removal without affecting the overall battery voltage. This approach eliminates the traditional series-parallel configuration limitations, enabling precise fault detection and removal of individual series packs while maintaining overall battery health.

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Battery system and electric vehicle that prevents series circuit failure due to abnormal interrupting device operation. The system features a parallel-connected battery pack with a current interrupting device, where each pack contains two identical batteries connected in parallel. The current interrupting device is integrated into the pack design, eliminating the need for separate interrupting devices in each battery cell. This configuration ensures reliable protection of the entire series circuit when an interrupting device malfunctions, rather than disconnecting individual cells.

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Battery system and electric vehicle that prevent soft pack battery overcharging through a novel configuration. The system comprises a series loop containing a soft pack battery and a first single battery connected in series with the soft pack battery. An additional current interrupting device is integrated into the first single battery. This configuration enables the system to automatically detect and interrupt overcharging currents in the series loop, protecting the soft pack battery from damage.

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Battery system and electric vehicle that prevents soft pack battery overheating through an intelligent current interruption mechanism. The system incorporates a current interrupting device that automatically disconnects the battery when abnormal conditions are detected, such as overcharging. This device is integrated into the battery cell casing and communicates with the internal gas to prevent overheating. The device is designed to respond quickly to abnormal conditions, ensuring safe operation of both the battery and the vehicle.

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