244 results about "Thermal safety" patented technology

The invention discloses a preparation method of a ceramic-gel polymer multilayer composite lithium battery diaphragm. The preparation method comprises the following steps: 1, preparing aqueous PVDF (polyvinylidene fluoride) slurry and aqueous ceramic slurry; 2, thermally compounding a polypropylene diaphragm and a polyethylene diaphragm at 50-100 DEG C to obtain PP/ PE (polypropylene/ polyethylene) composite diaphragm; 3, with the PP/ PE composite diaphragm obtained in the step 2 as a coating substrate, coating the aqueous slurry prepared in the step 1 onto the PE surface of the substrate: coating the aqueous ceramic slurry to form a ceramic layer first and then coating the aqueous PVDF slurry to form a gel polymer layer, with the coating speed of 5-100m/min, and drying in a drying box with the temperature of 30-100 DEG C to obtain a final four-layer composite diaphragm. The invention further discloses a ceramic-gel polymer multilayer composite lithium battery diaphragm prepared by the preparation method. The prepared ceramic-gel polymer multilayer composite lithium battery diaphragm has the advantages of high thermal safety and high capability of keeping electrolyte.

The invention discloses a composite diaphragm which comprises a supporting layer and an organic/inorganic particle blended coating layer, laminated; the coating layer comprises a polymer particle and an inorganic particle, uniformly mixed in an adhesive; micropore structures are arranged on the surface and at the inner part of the coating layer; the porosity is 20%-80%; the aperture average is 0.01 to 10 micrometers; the polymer particle comprises one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyimide, polyacrylonitrile and aramid fiber resin; the particle size of the polymer particle is 0.01-10 micrometers; the inorganic particle comprises any one or more of SiO2, Al2O3, CaO, TiO2, MgO, ZnO, SnO2 and ZrO2; the particle size of the inorganic particle is 0.01-10 micrometers; the mass ratio of the polymer particle to the inorganic particle is (1:10) to (10:1). The invention further discloses a method for preparing the composite diaphragm. The composite diaphragm and the method have good thermal safety and strong in electrolyte absorption stiffness value, and meanwhile, and can achieve the advantages of low cost and low pollution.

Disclosed is an electrode whose surface includes an organic/inorganic composite porous coating layer comprising heat-absorbing inorganic particles and a binder polymer, wherein the heat-absorbing inorganic particle is at least one particle selected from the group consisting of antimony-containing compounds, metal hydroxides, guanidine-based compounds, boron-containing compounds and zinc tartrate compounds. A separator using the heat-absorbing inorganic particles as a component for forming or coating the separator, and an electrochemical device including the electrode and/or the separator are also disclosed. The separator using the heat-absorbing inorganic particles as a component for forming or coating the separator can ensure excellent thermal safety and minimizes degradation of the quality of a battery.

The invention discloses a lithium battery diaphragm compounded from an aqueous polymer and inorganic nanoparticles. The lithium battery diaphragm comprises a polyolefin supporting layer, wherein one side of the polyolefin supporting layer is polymer coating, and the other side of the polyolefin supporting layer is ceramic coating; the polymer coating and the ceramic coating are compounded by a coating process; coating slurry used by the polymer coating and the ceramic coating is aqueous slurry; the polymer coating at least comprises aqueous adhesive and polymer particles; the ceramic coating at least comprises aqueous adhesive and the inorganic nanoparticles. The invention further discloses a preparation method of the lithium battery diaphragm. The invention has the advantages as follows: the prepared lithium battery diaphragm is high in thermal safety and long in cycle life; environment pollution is low during preparation.

Disclosed is an electrode active material comprising: (a) electrode active material particles capable of lithium intercalation/deintercalation; and (b) a multinary oxide coating layer partially or totally formed on the surface of the electrode active material particles, the multinary oxide coating layer comprising Al, P and a halogen element. A method for preparing the electrode active material, an electrode using the electrode active material, and an electrochemical device comprising the electrode, preferably a lithium secondary battery, are also disclosed. The electrode active material comprising a multinary oxide coating layer has improved structural stability and thermal safety, and thus can provide an electrochemical device having high capacity, long service life and excellent safety.

A vehicle warning system uses a switch placed on a vehicle childseat to determine occupancy of the seat, and a temperature detector to determine if an unsafe temperature exists in the vehicle interior. The system alarms if both these conditions exist to warn of a hazard to a child. The system installation in the vehicle is simply to place the switch on the childseat connect it into the system and provide power to the system. The system also provides a reminder if the alarm is turned off.

The present invention refers to a separator for an electrochemical device and an electrochemical device having the same. More specifically, the separator of the present invention comprises a porous substrate; a first porous coating layer formed on one surface of the porous substrate and comprising a mixture of inorganic particles and a first binder polymer; and a second porous coating layer formed on the other surface of the porous substrate and comprising a product obtained by drying a mixture of a solvent, a non-solvent and a second binder polymer.

Such separator of the present invention can have good thermal safety due to a porous organic-inorganic coating layer formed on one surface thereof, and superior adhesiveness due to a porous coating layer made of a binder thin film formed by applying and drying a mixture of a binder polymer and a non-solvent on the other surface thereof. Also, the separator can have a decreased thickness to reduce the resistance of electrochemical device and improve the capacity thereof.

The invention provides a flash evaporation super-cooling air-admission electric automobile waste heat recovery heat pump type integrated thermal management system. The system comprises an electric compressor, a four-way reversing valve, a vehicle interior air-conditioning heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a third electronic expansion valve, a vehicle exterior air-conditioning heat exchanger, a driving motor waste heat recovery heat exchanger, a driving motor heat exchanger, a motor water pump, a flash evaporation super-cooling air-admission device, a first solenoid valve, a second solenoid valve, a third solenoid valve, a multi-inlet gas-liquid separator and a thermal management controller. By employing the integrated thermal management system, integrated thermal management on a vehicle power system and the vehicle interior thermal environment is carried out; waste heat of a driving motor of an electric automobile and a power battery system is recovered; flash evaporation super-cooling air-admission automatic control is realized; the energy efficiency of the system is improved; the load of the vehicle exterior heat exchanger during a heating process is reduced; the thermal safety of a driving motor system and the power battery system is guaranteed; and damage to the driving motor system and the power battery system is prevented. The integrated thermal management system is low in cost, is high-efficient and energy-saving, has reliable performance, and is convenient to maintain.

A lightweight composite panel is provided that includes at least one mineral glass or glass-ceramic panel and at least one organic layer. The weight per unit area of the lightweight composite panel is in the range from 0.5 kg/m² to 5.5 kg/m², the ratio of the total thickness of the one or more mineral glass or glass-ceramic panels to the total thickness of all of the organic layers is from 1:0.01 to 1:1 and the total thickness of all of the organic layers is less than or equal to 350 μm. The lightweight composite panel complies with the thermal safety requirements of the air travel authorities and its “Total Heat Release,” measured in accordance with JAR/FAR/CS 25, App. F, Part IV & AITM 2.0006, is less than 65 kW×min/m² and its flame time after removal of the flame in the “Vertical Bunsen Burner Test”, measured in accordance with FAR/JAR/CS 25, App. F, Part 1 & AITM 2.0002A, is less than 15 s.

The invention relates to a module for the cooling circuit of an engine in an automobile, that comprises at least one control valve (18) allowing a flow according to at least one so-called nominal mode. The module further includes a thermal safety device (30) for said circuit, the thermal safety device (30) being capable of authorising a flow according to another so-called short-circuit mode in case of failure of the nominal flow mode. The invention can be used for automobiles.

The application relates to a comprehensive evaluation method and system for thermal runaway safety of a power battery. With the comprehensive evaluation method, multi-scale mechanism analysis and comprehensive evaluation are carried out on the thermal runaway of a battery. According to comprehensive evaluation method, related thermal stability testing is carried at three dimensions of the batterymaterial, the battery pole piece and the single battery body. On the basis of comprehensive comparative analysis of the test data, influences on the thermal runaway of the single battery body by thermal characteristics of different components and the mutual coupling effects between components are determined by combining in situ and ex-situ observation and material characterization methods. The mechanism analysis and thermal safety quantitative evaluation of the thermal runaway of the battery are provided by combining the test result of the adiabatic thermal runaway of the single battery body.The comprehensive evaluation method and system have the important practical value and guiding significance in the safety design and thermal runaway prevention of the power battery for an electric vehicle.

A circuit with at least one catalytic measuring element (1), in which the at least one catalytic measuring element (1) is connected to a supply voltage (5) without a protective resistor and without a thermal safety device arranged upstream. The circuit makes it possible to develop gas-measuring devices with catalytic measuring elements that are characterized by an especially low power consumption.

The invention discloses a thermal safety monitoring method for a lithium ion battery under dynamic pressure and variable temperature conditions. The method comprises the steps of: S1, putting a lithium ion battery under dynamic pressure and variable temperature conditions, and continuously monitoring and obtaining a plurality of parameters of the lithium ion battery; S2, judging the battery body temperature of the lithium ion battery, and if the battery body temperature is higher than T<safe>, executing S3, T<safe> representing the self-heat-production starting temperature of the battery; andS3, judging whether the lithium ion battery is subjected to thermal runaway or not according to the change conditions of the multiple parameters, if the lithium ion battery is subjected to thermal runaway, directly giving alarm information, and otherwise, calculating the thermal runaway time of the lithium ion battery, and giving early warning information. According to the method, the influence ofexternal working conditions such as delay and errors from a sensor and environmental pressure on the thermal runaway behavior of the battery is fully considered, and the problem that the selection ofthe critical value of the thermal runaway characteristic parameter of the battery is inaccurate is solved. The method can give an alarm in time, and control measures can be effectively taken to prevent the heat propagation behavior of the lithium ion battery.

The invention provides an EVA (ethylene vinyl acetate) based PTC (phenylthiocarbamide) composite material, a lithium battery anode and a lithium battery. The EVA based PTC composite material comprises the following components by mass: 60-83% of ethylene-vinyl acetate copolymer base material, 10-30% of conductive additive and 1-10% of dispersant. The Curie temperature of the EVA based PTC composite material is 90 DEG C. The EVA based PTC composite material is applied to the lithium ion battery anode to effectively prevent thermal runaway of the lithium ion battery so as to improve thermal safety performance of the lithium ion battery.

The invention discloses a main shaft sealing device of a high-speed turbine-generator applied to an ORC (organic Rankine cycle). The main shaft sealing device is characterized by comprising a high-speed turbine expander, a high-speed generator, a fastening bolt, a high-speed shaft seal and an air sealing and cooling system, wherein the high-speed shaft seal is arranged on a main shaft on one side of the impeller back of an impeller of the high-speed turbine expander, and the steam leakage of an organic working medium is reduced through contact sealing; according to a core technology adopted by the air sealing and cooling system, a high-pressure air chamber is built on the back side of the high-speed shaft seal, and the pressure of the high-pressure air chamber is regulated through a pressure relief valve; the air pressure of the high-pressure air chamber supplies back pressure to the high-speed shaft seal, and the high-pressure air chamber has an air sealing function; air flowing in the high-pressure air chamber can be used for cooling the high-speed shaft seal and taking away a trace amount of leakage from the high-speed shaft seal. According to the main shaft sealing device, the problems of low thermal safety, over-large ventilation loss and friction loss and the like of the high-speed generator caused by blow-by of the main shaft can be solved.

The invention discloses a visualized explosive cooking-off and gas product analysis device. The problem of thermal safety research of 1 kilogram of explosive under semi restriction condition at present is solved, and whole-process visualized observation and recording of testing phenomena and real-time qualitative analysis of cooking-off process gas products are achieved. The visualized explosive cooking-off and gas product analysis device mainly consists of three parts including a high-definition image pickup system, an explosive cooking-off system and a gas analysis system. The device adjusts and records the cooking-off temperature of a tested explosive by adopting a program control method. The reaction phenomena in the explosive testing process are recorded through the high-definition image pickup system. The qualitative analysis is conducted on decomposed gas products at different stages in the cooking-off process through the gas analysis system. The visualized explosive cooking-off and gas product analysis device is mainly used for thermal safety research of an energy-containing material/formula.

The invention discloses a composite coated diaphragm for a high-nickel ternary lithium-ion battery and a preparation method thereof. According to the composite coated diaphragm provided by the invention, a ceramic coating at one side of a negative electrode contains inorganic oxide so that the ceramic coating has relatively good heat-resisting property and mechanical strength and the thermal safety stability of the high-nickel ternary lithium-ion battery can be effectively improved; a sulfonic acid group on a carbon coating at one side of a positive electrode can be used for inhibiting the decomposition of electrolyte to a certain extent so that the interface stability between a material and the electrolyte is enhanced, the circulating performance of the battery is improved and the rate performance of the battery is effectively improved; the two types of coatings are complementary to each other due to respective excellent performance, so that the circulating performance, the rate performance and the safety performance of the high-nickel ternary lithium-ion battery are improved and large-scale application of a system is promoted; the composite coated diaphragm for the high-nickel ternary lithium-ion battery is high in practicability and equipment is easy to popularize and apply.

The invention provides a vehicle thermal exchanging system. A battery thermal exchanger in the vehicle thermal exchanging system realizes heating, refrigerating, temperature equalization and the likeof a battery pack through phase change of a refrigerant and thermal exchanging of the battery pack. Through a compressor, a low pressure gaseous refrigerant is compressed into a high pressure gaseousrefrigerant and is re-conveyed to a position needing to exchange heat. Moreover, when the battery pack needs to be thermal-insulated with outside environment, only thin gaseous refrigerant exists in the battery thermal exchanger; and at the moment, the battery thermal exchanger realizes thermal blocking ability to block transmission of heating between single batteries and prevent spreading of a thermal runaway phenomenon between the single batteries. When the temperature of the battery pack is close to or reaches a thermal runaway critical temperature, a high pressure low temperature liquid refrigerant in a refrigerant storage tank is sprayed out from a refrigerant atomizing device to cool the battery thermal exchanger and the single batteries so as to achieve thermal safety management ofthe battery pack.

The invention discloses a cooling-fin cylindrical battery pack heat dissipation device and method employing a composite phase changing material. A cooling fin comprises a main fin and auxiliary fins,wherein the main fin is of a fully-closed shell structure, a phase changing material is packaged in the main fin, the auxiliary fins are expanded towards two sides from a surface of the main fin, andtail ends of the auxiliary fins are in tangential contact with the surface of a battery. Cylindrical batteries in different specification sizes can be adapted by adjusting the size and the distance ofthe fins and the thickness of the phase changing material, and the heat dissipation and the heat preservation performance requirement is met. A fixed base is arranged at the bottom of a battery pack,the battery pack can be reinforced, the shock resistant capability is improved, a fan can be externally connected to improve convection, and the heat dissipation and heat preservation effect is improved. By the heat dissipation device, the advantage of the phase changing material is fully utilized, the temperature uniformity of the battery pack is improved, light requirement is conformed, thermaldisaster is prevented from propagating in a battery stack, the thermal safety of the battery pack is improved, and the heat dissipation device can be widely applied to various fields of automobile and aerospace.

A battery pack is disclosed which can inhibit unwanted electric short-circuits between a secondary battery and a thermal safety device. The battery pack may be further configured such that the number of welding points is reduced, simplifying a manufacturing process for the battery pack. The battery pack may include a secondary battery including a case having a first polarity, a terminal protruding from the case having a second polarity opposite to the first polarity, a safety member including an insulating holder mounted in the case around the terminal, a thermal safety device, and a conductive plate. The thermal safety device may be mounted in the insulating holder and electrically connected to the terminal. The conductive plate may be electrically connected to the thermal safety device and mounted in the insulating holder around the thermal safety device.