Fiber Optic Temperature Monitoring for EV Battery

Optimizing temperature management in large-scale energy storage systems using optical fiber temperature sensors and variable frequency cooling. The system improves temperature consistency and reduces overheating compared to fixed temperature control. It uses optical fiber temperature sensors inside battery modules to accurately monitor temperatures. An energy management system analyzes the data and sends adjustment instructions to the cooling system. Variable frequency pumps, compressors, and valves allow customized cooling capacity and flow rates. This enables dynamic temperature control based on real-time conditions to maintain optimal battery performance and prevent thermal runaway.

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Temperature measurement device for energy storage systems like battery storage that can measure temperatures both inside and outside the battery modules. It uses an optical fiber cable with spaced sensing spots to measure temperatures at intervals between modules. Additional outer sections connect the inner sections between stages. This allows monitoring temperatures between modules as well as inside the modules. The cable fixing units secure the cable between stages.

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System for measuring the temperature of battery cells inside a battery module without making physical contact. The system uses sensors placed within the module to optically measure cell temperatures through openings in the end walls. A cell monitoring unit processes the sensor data to generate temperature readings for the cells. The non-contact optical measurement allows accurate temperature monitoring of the cells without contacting them, which can minimize or eliminate contact and maximize the surface area being measured.

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Battery module temperature measurement system using optical sensors to non-invasively measure cell temperatures without contact. The system involves placing sensors in the module frame that can make line-of-sight temperature measurements through apertures in the frame to the battery cells. A cell monitoring unit processes the sensor readings to generate accurate cell temperatures. This allows quick, accurate, and non-invasive temperature monitoring of battery cells without contact, minimizing disruption to the cells.

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Optically operating temperature sensor for measuring surface temperatures of components like battery cells in electric vehicles without using electrical connections that could increase risk of short circuits. The sensor uses fiber optics with spaced-apart elements inside a rigid protective element that connects to the component surface. External forces are absorbed by the protective element, preventing deformation of the fiber and false temperature readings. The fiber's thermal expansion detects temperature changes.

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Battery pack thermal management system for electric vehicles that can monitor, control, and regulate battery temperature independently of the vehicle power state. The system has modules for temperature monitoring, data processing, judgment, and thermal management. It allows continuous temperature monitoring of the battery and environment during vehicle operation, compares against thresholds, generates control strategies based on alarms, judges strategies with historical data, and executes temperature adjustments to keep the battery within normal range. This improves battery life by preventing excessive temperature extremes when the vehicle is off.

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Low-profile traction battery for electric vehicles that uses infrared sensors with deflection optics to measure temperature of battery cells without contact. The sensors have arrays of IR-sensitive elements to spatially resolve temperatures. Deflection optics direct IR beams from cell surfaces to the sensor array outside the battery housing. This allows non-invasive, contactless temperature mapping of cells without needing to mount sensors inside. The deflection optics can be mirrors or curved surfaces. Multiple cells from different modules can be monitored with a single sensor.

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Temperature measurement device for battery packs that can efficiently monitor the temperature of multiple cells without using individual temperature sensors in each cell. The device uses a gathering part to collect infrared radiation emitted from the battery cells. The gathered radiation is focused and directed to a light receiving part with sensors. By analyzing the spectrum of radiation, the device can determine the temperature of at least a portion of the battery cell sides without needing temperature sensors in each cell. This reduces cost and space compared to individually sensing each cell. The radiation gathering and focusing is done using lenses and light guides to concentrate the emitted radiation.

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Thermo-fluorescent optical fiber sensor for measuring temperatures in applications like batteries. The sensor uses a thermo-fluorescent optical fiber with a layer containing thermo-fluorescent particles at one end or along the length. The particles emit light when heated and can be imaged through the fiber. The particles are held in place by a photo-polymerized matrix. The fiber is made by depositing the thermo-fluorescent particles, followed by the photo-polymerizable system, then curing to polymerize the matrix. This provides controlled distribution of the particles in the matrix for optimal sensor performance.

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An optical fiber temperature measurement system for power devices like battery modules to enable distributed temperature monitoring. Optical fiber cables are installed inside each module and connected to an external control unit. The cables contain fiber optics that can measure temperatures based on Raman scattering. This allows accurate temperature monitoring inside each module as well as between modules by connecting the fiber ends.

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Online monitoring system for batteries using fiber optic sensors to simultaneously measure multiple parameters like temperature, strain, pressure, voltage, current, and gas composition inside batteries in a closed, corrosive environment. The sensors are based on fiber Bragg gratings (FBG) that can be multiplexed and connected in series on a single fiber. This allows distributed, integrated, and distributed monitoring of batteries, modules, clusters, and systems. The FBG sensors have ultra-low reflectivity to enable high capacity multiplexing. A FBG demodulator reads the signals and transmits them to a computer. The FBG sensors are connected inside the battery using optical fiber connectors. This provides compact, corrosion-resistant, and electromagnetic interference-resistant monitoring without wiring complexities.

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A battery temperature monitoring system for electric vehicles that uses an infrared sensor instead of multiple temperature sensors on the battery pack. The system has an infrared photoelectric converter attached to the battery pack surface. An infrared sensor inside the converter emits infrared light and measures the reflected infrared light to determine the battery pack temperature. The converter has a voltage sampling circuit to provide the measured voltage to the vehicle's controller. This provides accurate battery pack temperature monitoring without the cost, complexity, and space requirements of multiple temperature sensors.

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Optimizing electric vehicle battery monitoring using separate onboard data collection and remote data analysis. A data collection device in the vehicle detects battery parameters like temperature and strain using fiber optics. The collected data is sent wirelessly to a remote analysis center for processing. This allows using existing vehicle electronics for data collection without needing dedicated hardware. The remote analysis enables efficient centralized processing of data from multiple vehicles, reducing onboard computational requirements.

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Embedding optical fibers in a flexible substrate to create a sensing membrane that can be attached to devices like batteries to monitor thermal, mechanical, and radiation properties without directly embedding the fibers in the device. The substrate thickness and material properties are chosen to accurately sense device properties when the membrane is either embedded in the device or attached to its surface. This allows monitoring temperature, strain, vibration, etc. of devices like batteries without complex fiber routing through each component.

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An optical fiber-based sensing membrane for monitoring temperature, strain, vibrations, and radiation in devices like batteries, nuclear power plants, and defense equipment. The membrane has integrated optical fibers embedded in a flexible substrate with a specified layout pattern. The layout compensates for spatial resolution and fiber losses. This allows accurate sensing of localized temperature, strain, etc. without needing individual fiber connections. The membrane can be applied directly to device surfaces or embedded in molded parts. It enables compact, flexible, and scalable sensing compared to embedding single fibers.

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A PHM (prognostics and health management) based control method and system for energy storage vehicles that predicts and prevents battery degradation and failure by continuously monitoring and analyzing battery parameters. The method involves collecting operating conditions, like temperature, voltage, and current, from the battery module. It uses machine learning models to process the data and predict future battery behavior. Based on the predictions, the system takes proactive actions to mitigate issues and prevent failures, such as adjusting cooling or heating, rather than waiting for problems to occur. The PHM approach enables more accurate and effective temperature control for energy storage vehicles.

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Battery temperature detection device for accurately measuring temperature inside battery cells. The device uses an infrared sensor with course changing means to direct IR rays from the cell to a specific area of the sensor. This ensures accurate temperature measurement by focusing the IR signal on a small area rather than averaging over the entire sensor. The course changing means can be a reflective member or guide to direct IR rays from the cell to the sensor. The sensor may have an absorbing region facing the cell to improve IR absorption. This allows more accurate temperature measurement by focusing the IR signal on a small area instead of averaging over the entire sensor.

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Electric vehicle battery temperature monitoring and alarm system that uses fiber optic sensors to provide high density, low cost temperature monitoring for battery packs. The system uses low cost components like fiber grating sensors, dense wavelength division multiplexers (DWDM), and narrowband filters. It allows simultaneous monitoring of absolute and relative battery temperatures. The absolute temperature is measured by a DWDM that only responds when the center wavelength of a grating sensor reaches a set threshold. Relative temperature is measured by a narrowband filter that only allows the center wavelength of all gratings to pass through. This allows dense grating arrays on each battery cell to be multiplexed and simultaneously monitored for absolute and relative temperature.

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Compact temperature measuring device for battery cells that occupies less space while accurately determining temperatures of at least partial regions of battery cells. The device uses a light guide plate to condense and direct electromagnetic radiation emitted by battery cells. This allows receiving the radiation using a compact light sensor array. The device measures temperatures by analyzing the spectrum of radiation from each cell to determine max/min values.

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Vehicle battery protection system using infrared imaging to monitor battery temperatures and prevent overheating. The system uses an infrared camera to capture images of the battery pack. Software processes the images to extract temperature data from each battery cell. If a cell's temperature exceeds a threshold, the system takes protective actions like cutting off power and limiting charging current. It also triggers active cooling if multiple cells are above threshold. This allows proactive intervention before thermal runaway.

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Real-time monitoring device for vehicle battery temperature to improve safety and performance of electric vehicles by constantly monitoring battery pack temperatures. The device has a temperature monitoring mechanism inside a collection chamber on the battery box. A heat-conducting belt connects the monitoring mechanism to the battery pack. A temperature sensor in the mechanism contacts the pack to directly monitor temperatures. The sensor collects data that is sent to a monitoring terminal. This allows real-time monitoring of individual battery cell temperatures to detect overheating issues.

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Real-time monitoring of battery temperature in electric vehicles to improve battery health and prevent overheating. The system uses an optical fiber sensor inside the battery pack that is illuminated by a light source. The sensor reflects back a spectrum based on the battery temperature. An electronic module processes the reflected signal to extract the temperature. This allows monitoring the internal battery temperature and coolant in/out temperatures in real-time. Alerts are sent if temperatures become abnormal.

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Lithium-ion battery with implanted optical sensor for monitoring battery health parameters. The battery has a sensing element that can monitor internal battery parameters like gas composition, temperature, and pressure. An optical fiber is used to connect the sensing element to an external demodulation module. The fiber is inserted into the battery and sealed. This allows internal sensing without removing the battery. The fiber connects to a demodulation module outside the battery to analyze and process the sensor signals. The demodulation module can be connected to equipment for further analysis.

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Battery module and energy storage system with temperature monitoring to improve efficiency and lifespan of battery packs. The battery module has multiple cells with temperature sensors at the top and bottom. This allows measuring the temperature gradient within the module. By monitoring the temperature at both ends of the cells, the overall working environment temperature of the module can be determined. This provides insight into the temperature range experienced by the cells during operation, which is critical for optimizing battery performance and longevity.

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Embedding optical sensors inside Li-ion battery cells using 3D printing techniques to provide real-time monitoring of cell-level parameters like temperature, state of charge, and state of health. The sensors are printed using a silica-based ink that cures in-situ. The sensors are located on the separator layer between the electrodes. This allows direct measurement of internal conditions without invasive techniques. The 3D printing enables precise placement of the sensors without impacting cell performance. The optical sensors have inert properties that can withstand the battery environment.

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Dynamic temperature monitoring system for lithium batteries in electric bicycles that provides real-time temperature monitoring and alerts to prevent overheating and fires. The system uses FPGA, temperature sensors, and an alarm. It compares battery and ambient temperatures to critical values. The FPGA processes temperature data, sets boundaries, and triggers alarms if thresholds are exceeded. This provides more accurate and timely temperature monitoring than traditional battery management systems.

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An intelligent battery management system for electric passenger vehicles that uses a network of high-precision temperature sensors connected via 5G-IoT. The sensors continuously monitor the temperature of each battery in real-time while driving, charging, and parked. This data is analyzed using edge computing to detect issues like overheating, abnormal self-discharge, and internal resistance. It also records charge/discharge data to evaluate battery health and lifespan. The system can limit speeds, currents, and removes faulty packs to prevent battery fires and explosions. The historical battery data improves safety, extends range, and recycling value.

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Battery management monitoring system for electric vehicles that uses optical fiber temperature sensors for temperature monitoring and communication between battery packs. The system replaces electrical connections between battery packs with optical fiber connections. Each pack has an optical fiber temperature sensor integrated into it that measures temperature and transmits the data over the optical fiber. This allows direct, high-speed, and interference-free communication between packs using the optical fiber itself.

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A secondary battery module with integrated optical sensing for monitoring cell characteristics and condition. The module has a battery pack with cells stacked inside. Each cell has a light-emitting unit to generate an optical signal based on cell voltage and temperature. An optical waveguide covers the cells and extends over them. The waveguide has a common path for the optical signals to propagate. This allows optical sensing of all cells in the pack without wiring connections. An exterior body contains the pack and waveguide. A light-receiving unit away from the pack receives the propagating signals to determine cell conditions.

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A battery temperature monitoring system for electric vehicles that uses inverse heat conduction to accurately monitor the internal temperature of the battery. The system has a temperature monitoring module, heating module, cooling module, and alarm module all mounted on the battery exterior. The main control unit uses inverse heat conduction algorithms to derive the internal battery temperature based on the external readings. This allows more accurate monitoring compared to just measuring the exterior temperature. The heating and cooling modules can then be controlled based on the derived internal temperature to maintain optimal battery performance.

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Battery module with improved temperature sensing for accurate battery monitoring without additional sensors on the cells. The module has temperature sensors on the circuit board near the cells and further away from the electronics. A controller calculates cell temperatures using signals from both sensors. This provides better estimation compared to just using the closer sensor, as the further sensor accounts for board temperature effects.

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Battery matrix temperature monitoring and controlling system for electric vehicles to enable real-time monitoring and adjustment of single battery temperatures during charging, discharging, and parking. The system vertically integrates temperature sensors in the battery pack, individual battery units, and current master control. It allows monitoring and controlling battery temperatures caused by current factors for 24 hours. This enables adjusting charging currents in real-time during fast charging to prevent overheating. It ensures battery safety and longevity by closely monitoring and managing individual battery temperatures.

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Battery monitoring method and system for lithium power batteries in electric vehicles that improves accuracy and safety compared to conventional methods. The monitoring involves using a fiber grating temperature sensor inside the battery instead of traditional on-board sensors. The sensor provides more accurate temperature data as it is less prone to interference and is less susceptible to short circuits. The sensor is connected to a processing module that analyzes the data. This allows more reliable and accurate monitoring of the battery's temperature, which is a critical parameter for safety and performance.

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Temperature monitoring system for early detection of vehicle fires, particularly in the engine compartment or battery compartment, using fiber optic sensors. The system has a light source with a tunable wavelength, an optical fiber interferometer, and a detector connected to a signal processing module. The light source is pulsed with a short periodic waveform to scan the fiber length. The interferometer detects temperature changes along the fiber. By sweeping the wavelength, sub-centimeter resolution is achieved. This allows highly localized temperature monitoring near components like batteries and pumps. Alarms are triggered when temperatures exceed thresholds at specific points.

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Battery management monitoring system using optical fiber temperature sensors that enables efficient, high-speed, and low-cost communication between battery packs without additional wiring. The system leverages the existing optical fiber temperature sensors in each battery pack to also transmit data over the same fiber. This eliminates the need for separate electrical connections and communication devices. The sensors have both temperature measurement and optical communication functionality. The sensors transmit temperature data using modulated light signals through the fiber to neighboring packs. This allows direct, fiber-based communication between packs using the sensors themselves, improving reliability and speed compared to electrical signals.

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Monitoring the surface temperature of a battery cell to improve accuracy compared to just measuring the cell connection temperature. The method involves determining a compensation value based on cell state and using that along with connection temperature to estimate surface temperature. The compensation is higher for cells with low charge and lower for cells with high charge. This accounts for the fact that the heat generated by charging/discharging is not evenly distributed on the cell surface. By considering the charge level, the method provides a more accurate estimate of the surface temperature of the cell.

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Temperature measurement device for battery packs that provides full coverage monitoring of cell temperatures without direct contact. The device uses a non-contact infrared thermometer mounted on the battery pack frame to measure the temperature of the cells indirectly through radiation. This avoids issues like bonding errors, complicated wiring, and representative cell selection. The thermometer's position is optimized to capture the average cell temperature.

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Self-correcting method for detecting battery temperature in hybrid electric vehicles using infrared sensors instead of traditional temperature sensors. The method involves continuously monitoring the infrared radiation emitted by the battery and surroundings to accurately determine the battery temperature. It compensates for temperature propagation delays and sensitivity degradation issues of traditional sensors by leveraging the faster and more reliable infrared detection. This allows better control of battery charging/discharging in hybrid electric vehicles with distributed batteries.

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Remote and isolated temperature sensing of an electrical terminal like an EV charging connector without adding thermal mass or electrical resistance to the terminal. The method involves applying a thin patch with low thermal mass to the terminal surface and sensing changes in the patch using an isolated external circuit. The patch allows isolation without adding thermal mass like embedded sensors do. The patch can have magnetic particles that expand/contract with temperature, or a photodetector reflecting light from the terminal.

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Lithium battery thermal safety monitoring system using optical fiber detection to accurately and efficiently monitor battery temperature inside a pack without needing multiple surface sensors. The system involves inserting an optical fiber through the battery wall to measure temperature inside. It uses a laser source to shine light into the fiber, which is scattered by molecules at different temperatures. This scattered light is detected at the other end of the fiber to determine the temperature at that point inside the battery. The system can also have a mobile spray head to cool overheating batteries.

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A battery pack temperature monitoring system for electric vehicles that uses a non-contact infrared laser sensor to scan the internal temperature of battery cells in real-time. The sensor slides on a rail inside the battery pack and is electrically connected to a controller outside the pack. This allows continuous monitoring of cell temperatures without physical contact to detect overheating and prevent damage or safety issues.

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Safety control system for lithium battery energy storage systems that uses optical fiber temperature measurement to monitor battery temperature and prevent thermal runaway. The system uses optical fibers with temperature-sensitive grating elements to accurately and rapidly monitor the temperature of each battery cell. By comprehensively monitoring the temperature of each cell, it can diagnose battery health and predict thermal runaway. This allows early warning and control to prevent battery fires in the storage system.

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Intelligent battery management system for electric vehicles that can detect and mitigate thermal runaway in batteries more effectively. The system uses a distributed temperature sensor network with cells and pack temperature sensors. It calculates the temperature change rates of individual cells and the pack. If a cell's rate exceeds the pack rate, it indicates thermal runaway. This enables earlier detection of runaway cells compared to just monitoring pack temperature.

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Lithium battery thermal safety monitoring system using optical fibers to accurately and rapidly detect temperature inside battery packs without needing many temperature sensors. The system uses an optical fiber temperature sensor that is inserted against the battery wall. A light source emits light into the fiber which is scattered by Raman effect as it travels through the fiber. The scattered light is detected at the end of the fiber and demodulated to extract temperature data. This allows precise, non-invasive temperature measurement inside battery packs without needing multiple temperature sensors. The fiber is also filled with flame retardant liquid to protect the battery.

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Adjusting vehicle systems based on the thermal profile of an electric vehicle battery to improve battery life and vehicle performance. The method involves monitoring temperatures at multiple locations inside the battery using sensors. If a sensor's temperature deviates from a threshold, it indicates reduced battery capacity or power supply at that location. The deviations are used to generate variable control signals to adjust power consumption in vehicle systems. This mitigates overloading or underutilizing battery areas with temperature issues.

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Battery temperature management system for electric vehicles that improves the accuracy and functionality of the on-board battery management system. The system uses a fiber grating sensor on the battery pack surface to measure temperature in addition to the existing temperature sensor. This additional temperature data is fused with other inputs using multi-algorithm state estimation to more accurately estimate battery state parameters like remaining charge, available current, and health. The fused estimates are then used for final battery status judgment and display by the on-board management device.

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Fiber optic network for monitoring temperature of batteries in electric vehicles. The system uses fiber optic sensors to measure battery temperature instead of point-type thermocouples. It provides a centralized and more reliable way to monitor the temperature of each battery module in an EV pack. The fiber optic system has multiple channels to monitor multiple batteries simultaneously. The fiber sensors are integrated into the battery pack and send the temperature data via optical fibers to a central processing unit. This allows real-time monitoring of battery temperatures without the need for multiple electrical connections and wiring.

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Embedding optical fiber sensors inside electrodes of lithium-ion batteries to enable real-time, in-situ monitoring of internal parameters like temperature, stress, strain, concentration, chemistry, and gas presence. The fiber optic cables with sensors are placed between the current collector and electrode material layers during battery manufacturing. This provides more accurate and stable sensor signals compared to external methods. The embedded sensors enable better characterization of individual anode/cathode electrodes versus average cell values. The sensors can also detect electrode failures earlier.

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Battery management system with an infrared monitoring system to detect the temperature of individual battery cells within a pack. This allows fine adjustment and detection of abnormalities in the cells. Multiple infrared cameras are placed inside the battery compartment to capture temperature fields at each cell point. The system can also have heating and cooling systems, insulation detection, and cloud connectivity for optimization and monitoring.

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Battery temperature monitoring and early warning system for electric vehicle batteries that can accurately detect and alert on internal battery temperatures to prevent overheating and thermal runaway. The system involves placing a liquid-cooled flat tube with temperature sensors inside the battery pack, between sub-modules. This allows monitoring the internal battery temperatures. An early warning unit connected to the sensors can detect abnormal temperatures and issue alerts to prevent issues like thermal instability.

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