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1178 results about "Thermal runaway" patented technology

Thermal runaway occurs in situations where an increase in temperature changes the conditions in a way that causes a further increase in temperature, often leading to a destructive result. It is a kind of uncontrolled positive feedback.

Lithium ion battery diaphragm and high temperature thermal-stable lithium ion battery

InactiveCN102437302AAvoid thermal runawayImproved high temperature thermal stabilitySecondary cellsCell component detailsThermal runawaySilicon nitride
The invention provides a lithium ion battery diaphragm and a high temperature thermal-stable lithium ion battery, which relate to lithium ion batteries. The diaphragm comprises a polyolefin microporous membrane which acts as a basic layer, wherein a nano ceramic material coating is manufactured on one side surface or two side surfaces of the polyolefin microporous membrane; and compositions of the nano ceramic material coating comprise any one of a zirconium oxide, an aluminum oxide, a silicon oxide, a titanium oxide, a silicon nitride, a boron nitride and an aluminum nitride or a combination of any oxide and any nitride, and additionally comprise binders. Since a high temperature resistant nano ceramic material is led into the surface of a conventional diaphragm, an insulating property better than the insulating property of the conventional diaphragm is provided, further internal insulating property damage brought by thermal contraction of the conventional diaphragm, which leads to thermal runaway of the lithium battery, is avoided particularly at high temperatures of 130 DEG C, 150 DEG C and 180 DEG C, and thereby the high temperature thermal stability of the lithium ion battery is improved and the safe reliability of the lithium ion battery is increased.
Owner:DONGGUAN ADVANCED ELECTRONICS TECH

Composite plate for heat dissipation and thermal runaway propagation prevention of battery system

The invention discloses a composite plate for heat dissipation and thermal runaway propagation prevention of a battery system. The composite plate comprises a heat conduction shell, a phase changing material and an isolation plate; in at least two single batteries, the composite plate is tightly arranged in a gap between the batteries, and the composite plate and the single batteries are alternatively arranged; the heat conduction shell can be used for transferring heat generated by the single batteries to the phase changing material and an environment so as to improve the cooling capability of a battery pack; the filled phase changing material can absorb a large amount of heat, the batteries are effectively enabled to work in a normal temperature range, and the temperature uniformity of the battery pack is greatly improved; and the isolation plate can be used for effectively preventing heat from directly passing through the composite plate, the heat generated the thermal runway single batteries can be effectively isolated, so that thermal runway of the batteries is limited in the single battery, and chain thermal runway of the batter pack is prevented. By the composite plate, the conflict between thermal runway blocking in the battery system and system cooling is solved, thermal runway blocking and system cooling can synergistically act, and thus, the safety of the battery pack is improved.
Owner:安徽中科久安新能源有限公司

Temperature drop and extinguishment liquid cooling device, monitoring system and monitoring method for thermal runaway of power battery

The invention relates to a temperature drop and extinguishment liquid cooling device, a monitoring system and a monitoring method for thermal runaway of a power battery. The liquid cooling device comprises a plurality of liquid cooling units, wherein each liquid cooling unit comprises a liquid cooling unit body and a coolant in the liquid cooling unit body; the liquid cooling unit bodies are prepared from high-temperature fusible materials, and tightly bound with the surfaces of corresponding single batteries by respective matched structures; when thermal runaway temperatures of the single batteries exceed fusion points of the high-temperature fusible materials, the liquid cooling unit bodies are fused and then the coolants in the liquid cooling unit bodies enter a battery pack to perform temperature drop cooling or extinguishment on the single batteries. The temperature drop and extinguishment liquid cooling device for the thermal runaway of the power battery is simple in structure, and lower in cost, can effectively monitor and treat the thermal runaway of the power battery of an electromobile, eliminates a potential safety hazard in first time, and ensures the safety and the reliability of an electromobile system.
Owner:BEIJING HANGSHENG NEW ENERGY TECH CO LTD

System for testing thermal performance of vehicle power battery

A system for testing thermal performance of a vehicle power battery belongs to the field of electric vehicle batteries. The system includes a high-temperature explosion-proof box; a pressure sensor, a temperature sensor, a heating and cooling device, a battery module and a circulating fan are arranged in the high temperature explosion-proof box; the circulating fan is connected with a circulating motor; the high temperature explosion-proof box is provided with an exhaust hole; the exhaust hole, a ball valve, a sampling port, a cut-off valve and a gas chromatograph are connected in sequence; the ball valve is connected to a gas collecting bag through an air exhaust pipe; the pressure sensor and the temperature sensor are connected to the computer through a data collector; a charge-discharge machine is connected to the battery module through a socket; the high temperature explosion-proof box is provided with an observation window; and the observation window is connected to a camera through an endoscope. The system can perform thermal property test of the battery, battery discharge analysis and thermal runaway test of the battery. The system has the advantages of simple structure and low cost, can carry out test on multiple functions of the lithium ion battery, so as to realize design optimization on the structure of the battery pack; and the system has broad market prospects.
Owner:BEIJING UNIV OF TECH

Power lithium ion battery thermal runaway early warning system and early warning method

InactiveCN106569142AAvoid personal accidentsReduce lossesSecondary cellsElectrical testingAviationLow speed
The invention discloses a power lithium ion battery thermal runaway early warning system. The system comprises a microprocessor and an alarming apparatus, and the system is characterized in that the system further comprises an electric signal monitoring unit, a smog monitoring unit, a temperature monitoring unit, a controller and a human-computer interaction end. One ends of the electric signal monitoring unit, the smog monitoring unit, the temperature monitoring unit are connected to the lithium ion battery respectively, the other ends are connected to the microprocessor, one connecting end of the controller is connected to the microprocessor, and the other end of the controller is connected to the alarming apparatus. The invention further discloses a power lithium ion battery thermal runaway early warning method applicable to the system. The power lithium ion battery thermal runaway early warning system can conduct monitoring on the charge-discharge voltage, electric current, battery temperature and smog in a battery package of the lithium battery, can perform early warning in time according to a monitoring result and notify a user to manage in time, and is applicable to other fields of energy storage equipment, low-speed scooters, passenger cars, business cars and aviation and the like.
Owner:HUAZHONG UNIV OF SCI & TECH

Method and device for restraining and preventing thermal runaway of lithium ion battery

InactiveCN104882639AMethods of suppressing and preventing thermal runawayTemperature monitoringSecondary cells servicing/maintenanceAutomatic controlPower efficient
The invention relates to a method and a device for restraining and preventing thermal runaway of a lithium ion battery. According to the method, a liquid inert gas is utilized to perform spraying refrigeration and fire fighting on a faulted lithium ion battery. The method comprises the following steps: A, selecting spraying time; B, determining the spraying quantity of a sprayed gas; C, determining a spraying mode, wherein the spraying mode refers to continuous spraying or interrupted spraying. The device comprises a control cabinet, a storage tank, a main control valve, a secondary control valve, a nozzle, a detector and a safety valve, wherein the control cabinet is a manual button control cabinet or an automatic control cabinet provided with a PLC (Programmable Logic Controller); the detector comprises a temperature sensor used for monitoring the temperature of one or more battery monomers. The method and the device have the advantages that dual effects of refrigeration and fire fighting are achieved, a security mode is complete in functions, stable, safe, reliable and efficient, a vaporization product of the liquid inert gas is nontoxic, environmentally friendly and clean as well as free from secondary damages on battery equipment.
Owner:湖北长海新能源科技有限公司

Lithium ion battery overcharge thermal-runaway modeling method

The invention provides a lithium ion battery overcharge thermal-runaway modeling method and belongs to the field of batteries. The lithium ion battery overcharge thermal-runaway modeling method comprises the steps that a heat-insulating overcharge thermal-runaway experiment is firstly conducted on a first lithium ion battery, and the temperature, voltage and internal resistance of the first lithium ion battery at different moments are recorded; then, a second lithium ion battery same as the first lithium ion battery is disassembled, and relation curves including positive and negative voltages of the second lithium ion battery and the stoichiometric number of lithium ions are respectively obtained; stage division is conducted on the overcharge thermal-runaway process of the first lithium ion battery, internal chemical reactions of the batteries corresponding to different stages are determined, and finally a mathematical model of the first lithium ion battery in the heat-insulating overcharge thermal-runaway experiment process is established. The lithium ion battery overcharge thermal-runaway modeling method simultaneously simulates the change rules of the voltage and temperature in the overcharge thermal-runaway process, accurately simulates overcharge thermal-runaway behaviors of the lithium ion batteries and guarantees the battery system safety.
Owner:TSINGHUA UNIV

Method for monitoring thermal runaway of lithium ion battery of electric vehicle

The invention relates to a method for monitoring thermal runaway of a lithium ion battery of an electric vehicle. A voltage changing rate parameter when thermal runaway occurs in the lithium ion battery is monitored, and a battery voltage can be reduced abruptly, is maintained at a low voltage for 40-60 seconds and then is gradually raised to an initial voltage when the thermal runway occurs in the lithium ion battery; the fact that thermal runaway occurs in the battery can be judged by taking the battery voltage changing rate parameter as a monitoring object and is a first judgment method; abattery temperature rising rate changing parameter is monitored, the fact that thermal runaway occurs in the battery also can be judged when the battery temperature rising rate is larger than or equalto 10 DEG C per minute and is a second judgment method; and a battery management system (BMS) is used for monitoring, analyzing and judging the battery voltage changing parameter and the battery temperature rising rate parameter, the two methods are used as an independent condition or a logic combination condition and used as a technological basis for judgment on thermal runaway of the battery, and an early-warning signal can be given out in advance when thermal runaway occurs. By the method, the battery thermal runaway judgment time is greatly increased, and enough handling time is providedfor a person to escape and timely take a measure to prevent battery thermal runaway from being generated, propagating and being expanded.
Owner:应急管理部天津消防研究所
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