66results about How to "Prevent internal short circuit" patented technology

Disclosed is an electrode comprising a first organic/inorganic composite porous coating layer formed on its surface, wherein the first coating layer includes inorganic particles and a binder polymer for interconnecting and fixing the inorganic particles, and has micropores formed by interstitial volumes among the inorganic particles. An electrochemical device including the same electrode is also disclosed. Further, disclosed is a method for manufacturing an electrode having an organic/inorganic composite porous coating layer on the surface thereof, comprising the steps of: (a) coating a current collector with slurry containing an electrode active material and drying it to provide an electrode; and (b) coating the surface of electrode obtained from step (a) with a mixture of inorganic particles with a binder polymer. A lithium secondary battery including the electrode shows improved safety and minimized degradation in battery performance.

The invention discloses a lithium ion liquid flow battery, belonging to a chemical energy storage battery technology field. A fixed electrode layer is arranged between an electrode reaction chamber and a diaphragm of the lithium ion liquid flow battery of the invention, thereby avoiding the direct contact between the diaphragm and a flowing electrode suspension liquid, effectively avoiding internal short circuit of the battery, and raising safety performance and work efficiency of the battery.

An alkaline battery separator comprising an alkali-resistance synthetic fiber, a fibrillated organic solvent-spun cellulose fiber having a Canadian standard freeness value of 10 to 280 ml, and a mercerized pulp having a Canadian standard freeness value of not less than 550 ml is prepared. In the separator, the proportion of the alkali-resistance synthetic fiber, the proportion of the fibrillated organic solvent-spun cellulose fiber, and the proportion of the mercerized pulp relative to the total amount of the separator are respectively 25 to 62% by mass, 5 to 25% by mass, and 33 to 50% by mass, provided that the total amount of the separator is 100% by mass. The alkali-resistance synthetic fiber may comprise a polyvinyl alcohol-series fiber having an average fiber fineness of not more than 1 dtex. The alkaline battery separator may further comprise a polyvinyl alcohol-series binder in a proportion of 3 to 20% by mass relative to the total amount of the separator. The alkaline battery separator of the present invention may have a shrinkage by the area of not more than 3.5% after immersing in an aqueous solution of potassium hydroxide having a concentration of 40% by mass at 80° C. for 24 hours and a stiffness strength of not less than 2 N.

A display device and a manufacturing method thereof are provided. The display device includes a substrate, a semiconductor layer formed on the substrate, an organic insulating layer formed on the semiconductor layer, a plurality of conductive wires formed on the organic insulating layer. The organic insulating layer has an open groove that is formed between the conductive wires.

The invention relates to a lithium ion battery composite separator, a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery composite separator comprises a base film; one side of the base film is coated with a hot-melting polymer coating; the other side of the base film is coated with a heat-proof coating; the melting temperature of the hot-melting polymer coating is lower than the hot-melting temperature of the base film; the melting temperature of the heat-proof coating is higher than the hot-melting temperature of the base film; the hot-melting polymer coating comprises the following ingredients by weight: 50 to 98 parts of one or more hot-melt polymer materials, and 2 to 50 parts of one or more agglomerants; the heat-proof coating comprises the following ingredients by weight: 50 to 92 parts of one or more heat-proof polymer materials, and 3 to 20 parts of one or more agglomerants. The lithium ion battery composite separator is favorable in liquid sucking and retention properties, low in heat blocking hole temperature, and high in separator breaking temperature, thereby being capable of obviously improving the safety and the electrochemical property of the battery.

The present invention provides a lithium ion secondary battery including: an electrode group including a belt-like positive electrode and a belt-like negative electrode that are wound with a separator interposed therebetween; and a can with a bottom for accommodating the electrode group, wherein the positive electrode has a positive electrode current collector and a positive electrode mixture layer carried on the positive electrode current collector, the negative electrode has a negative electrode current collector and a negative electrode mixture layer carried on the negative electrode current collector, and a porous heat-resistant layer is partially provided between the separator and at least one of the positive electrode mixture layer and the negative electrode mixture layer. Since a porous heat-resistant layer is thus placed, a high performance lithium ion secondary battery capable of efficiently preventing internal short circuit due to overheating while preventing decrease in battery characteristics can be provided.

A material that can be used in a wide temperature range and a manufacturing method thereof are provided. A graphene compound has a substituted or unsubstituted chain group. The chain group has one or more ester groups or carboxyl groups and contains a Si atom. The chain group is bonded to a graphene layer through the Si atom. A method for forming a graphene compound includes a step of stirring graphene oxide and a Lewis base and a step of mixing a silicon compound having one or more ester groups or carboxyl groups into the mixed solution and stirring the obtained mixed solution. The Lewis base is butylamine, pentylamine, hexylamine, diethylamine, dipropylamine, dibutylamine, triethylamine, tripropylamine, or pyridine.

The invention discloses a polypropylene microporous membrane with a three-layer compound structure and a preparation method of the polypropylene microporous membrane. The polypropylene microporous membrane with the three-layer compound structure comprises surface layers A and C and a core layer B, wherein the surface layers A and C are made from beta crystal form homo-polypropylene and the core layer B is made from beta crystal form co-polypropylene; or, the surface layers A and C are made from beta crystal form co-polypropylene and the core layer B is made from beta crystal form homo-polypropylene. The preparation method comprises the following steps: (1) respectively melting and mixing the beta crystal form homo-polypropylene and the beta crystal form co-polypropylene, carrying out co-extrusion via a three-layer compound die head and cooling the extruded molten membrane; and (2) stretching the three-layer compound beta crystal form polypropylene membrane. The polypropylene microporous membrane with the three-layer compound structure, disclosed by the invention, has high fusing temperature and low closed pore temperature simultaneously and has the advantages that when the membrane is used for battery diaphragms, closed pores can be timely molten to terminate the battery reaction and the internal short caused by fusing can be avoided, so that the safety is greatly increased.

The present invention discloses a thermal-resistant and flame-retardant membrane and a preparation method thereof, and applications. According to the preparation method, the cost is controllable, theoperation of the preparation process is simple, and thus the preparation method is suitable for mass production. The prepared thermal-resistant and flame-retardant membrane has a double-layer composite structure with both thermal stability and flame retardancy, the membrane can prevent internal short circuit of a battery at a lower temperature, so that severe thermal runaway of the battery is prevented, and thus safety accidents, such as burning and explosion are prevented; the membrane can effectively prevent the battery from burning and exploding after the thermal runaway of the battery occurs under the conditions of overcharge, puncture and abuse; and the membrane has good applications in the chemical power supply system, especially in lithium ion batteries.

The invention discloses a production method for a diaphragm used for a lithium ion battery, which comprises the following steps: preparing high melting point plastic particles blended with a nano material; extruding and stretching the obtained high melting point plastic particles blended with the nano material; and thermoforming; wherein the nano material is one of nanosilicon dioxide, nano-barium sulfate and nano calcium carbonate, and the high melting point plastic particles are one of PEEK, PEI or PPS plastic particles. The thickness of the produce diaphragm can reach 1 micrometer, the porosity can reach 80%; the inorganic nano particles are non-conducting material, and can not be melted under the temperature of diaphragm melting, anode cathode contact of the battery can be effectively obstructed, and the generation of internal short circuit of the battery can be prevented. The production method for the diaphragm used for the lithium ion battery can reduce the cost of the lithium ion battery and increase the service life of the lithium ion battery.

The invention discloses a self-regulation safety charging gun for a new energy vehicle, which comprises a hollow gun body, a charging module is arranged in the gun body, a plug is slidably connected to the side wall of the gun body in a sleeving mode, a plurality of limiting grooves are formed in the side wall of the plug, and a plurality of first springs are fixedly connected between the plug and the inner wall of a groove of the gun body. First conducting strips are glued to the side walls of the plug and the gun body, the first conducting strips are electrically connected with the charging module through wires, a plurality of vent holes are formed in the side wall of the gun body, and a thermal inductance device is arranged in the gun body. The charging gun has the advantages that the charging gun can open the vent holes to dissipate heat in case of overheating on the premise of ensuring waterproofness, and can automatically regulate and control to reduce current to suppress the overheating condition in case of poor heat dissipation effect, thereby avoiding long-term high-temperature working aging of an internal circuit, and actively disconnecting charging in case of short circuit and serious overheating to avoid economic loss or fire caused by spontaneous combustion; and safety and reliability are improved.

A nonaqueous secondary battery comprises a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, wherein at least one of the positive electrode and the negative electrode is provided with a current collector composed of a film-like or fibrous resin layer having a conductive layer on both sides, and the separator has a higher thermal deformation temperature than the resin layer.

The invention discloses a lithium ion battery positive plate, which comprises a positive current collector. A cathode material layer is painted on the surface of the positive current collector. An isolation layer is painted on the surface of the cathode material layer. The cathode material layer is prepared from the following components in percentage by weight: 55 to 60% of positive active material, 3 to 5% of first binder, 1 to 3% of conductive agent, and the balance being a first organic solvent. The isolation layer is prepared from the following components in percentage by weight: 62 to 65% of nano silicon dioxide, 1.5 to 2% of second binder, 0.5 to 1% of sodium naphthalene sulfonate-formaldehyde condensate, 1 to 3% of ethanol, and the balance being a second organic solvent. The positive plate cannot be dissolved or oxidized, the safety of battery is improved, and the safety risk of lithium battery is reduced. The invention also discloses a preparation method of the lithium ion battery positive plate. The preparation technology is simple, there is not special requirement on equipment, the preparation cost is low, the operability is strong, and the method is suitable for large scale industrial production.

The invention relates to an anode of a lithium-ion battery and a lithium-ion battery prepared from the same. The anode of the lithium-ion battery comprises an anode base material layer, an anode active substance layer, and an aluminum oxide micro-pore coating which can replace traditional lithium-ion battery PP and PE isolating membranes. The aluminum oxide micro-pore coating on the surface of the anode of the lithium-ion battery not only has relatively high mechanical intensity, but also has good electrolyte-keeping capability, avoids the phenomenon of closing holes at a high temperature, furthermore guarantees a battery to have better high-temperature adaptability in a temperature application scope, and is applicable for a high-power lithium-ion battery.

The invention discloses a technology for improving the wavy shape of the edge of a lithium ion battery positive plate. The technology comprises the following steps: (1) rolling the laminated lithium ion battery positive plate by using a hot-pressing silica gel skin material with the inner diameter of 5 to 10 mm; (2) after rolling, putting the positive plate into an oven without vacuum pumping forbaking for 2 to 4 h, wherein the baking temperature is 100 to 120 DEG C; and (3) after baking, cooling a plate roll to the room temperature, carrying out stripping to prepare the positive plate. The laminated positive plate is rolled by using the silica gel skin material, the rebound and stress of the plate during rolling can be buffered effectively, and the uniform rolling orderliness and tensionof the plate are guaranteed; the pressure of the plate is released by baking the plate at high temperature, uniform stress of the plate during stripping is guaranteed, and the wavy shape of the edgeof the positive plate is avoided. Therefore, internal short circuits of a lithium ion battery in the using process are avoided, and the potential safety hazards, such as fire and explosion, of the lithium ion battery are reduced.

The invention discloses a damping and buffering device for a storage battery, and the device comprises a box body, a cover plate, a clamping mechanism and a damping mechanism; the damping mechanism comprises a sliding rod and a damping assembly, and the clamping mechanism comprises a lantern ring, a limiting rod, a pushing rod, a connecting rod, a first connecting rod, a second connecting rod, a clamping plate and a moving assembly. According to the damping and buffering device for the storage battery, primary damping of the storage battery is achieved through the damping mechanism, up-down limiting of the storage battery is achieved through the abutting mechanism and the bearing plate, left-right limiting of the storage battery is achieved through the clamping mechanism, and meanwhile, the secondary damping of the storage battery is achieved through the second spring; through the buffer mechanism arranged in the rubber ball, when the storage battery is vibrated, the storage battery can return slowly, so the storage battery returns more stably, a sliding block is driven to move through the dead weight of the storage battery, and a clamping plate clamps the storage battery, so the storage battery is prevented from being internally short-circuited due to excessive vibration, and the service life of the storage battery is prolonged; and the usability of use is improved.

The invention provides a pole piece and a secondary battery with the same. The pole piece comprises a current collector and an active substance layer, the current collector comprises a main body part and a tab, the active substance layer is coated on the surface of the main body part, and the tab extends from one end of the main body part along a first direction; a first insulating part is formed on the end face, provided with the tabs, of the main body part, and a second insulating part different from the first insulating part is formed on the end face, not provided with the tabs, of the main body part. The pole piece has good end face insulation protection, and the safety performance of the secondary battery can be improved.

The invention discloses a polymer electrolyte and a preparation method and application thereof. The polymer electrolyte comprises a polymer matrix, the polymer matrix is a polymer formed by self-polymerization of a polymeric monomer composed of three building blocks of acryloyl, carbamate and phosphate, or a polymer formed by copolymerizing a polymeric monomer and other monomers, wherein the polymeric monomer is composed of three building blocks, namely acryloyl, carbamate and phosphate. The polymer electrolyte can be used in a battery, the polymer matrix can be subjected to a self-crosslinking reaction at a high temperature of 130-190 DEG C to generate a compact thermosetting polymer which can cut off ion transmission and prevent thermal runaway of the battery; the self-crosslinking reaction is an endothermic reaction, so that the temperature of the battery can be quickly reduced, and the thermal runaway of the battery can be prevented; the polymer electrolyte can capture free radicals and has intrinsic flame retardance; and the characteristics of the polymer matrix are synergistic, so that the thermal runaway of the battery can be effectively prevented.