36results about How to "Improve nail penetration safety performance" patented technology

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector, an electrode active material layer arranged on at least one surface of the current collector, and an electric connection component electrically connected with the current collector, the current collector comprises a supporting layerand a conductive layer arranged on at least one surface of the supporting layer, the thickness D2 of a single surface of the conductive layer satisfies the following formula: D2<=D2<=1. D2 is greaterthan or equal to 30nm and less than or equal to 3[mu]m; the supporting layer is a high polymer material layer or a high polymer composite material layer; the electrode active material layer comprisesan electrode active material, a binder and a conductive agent; seen from the width direction of the coated surface of the electrode plate, the coated electrode active material layer comprises 2n+1 (n=1, 2 or 3) areas based on the compaction density, the compaction density of the middle area is higher than the compaction density of the two side areas, and a support protection layer is arranged on the surface of the extension area of the current collector.

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a metal current collector, a positive active material layer and a safety coating arranged between the metal current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler, the positive activematerial layer contains Li<1+x>NiaCobMe<1-a-b>O2, x is greater than or equal to -0.1 and less than or equal to 0.2, a is greater than or equal to 0.6 and less than 1, b is greater than 0 and less than1, (1-a-b) is greater than 0 and less than 1, and Me is selected from at least one of Mn, Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti and Zr; and the metal current collector is an aluminum-containing porous current collector. The positive pole piece can improve the electrical performance and safety performance of an electrochemical device (such as a capacitor, a primary battery or a secondary battery).

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a metal current collector, a positive active material layer and a safety coating arranged between the metal current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler; the polymer matrix is a polyvinylidene fluoride and/or polyvinylidene chloride polymer matrix; based on the total weight of the safety coating, the weight percentage of the polymer matrix is 35wt%-75wt%, the weight percentage of the conductive material is 5wt%-25wt%, and the weight percentage of the inorganic filler is 10wt%-60wt%, and the elongation at break [delta] of the metal current collector is greater than orequal to 0.8% and less than or equal to 4%. The positive pole piece can quickly disconnect a circuit when an electrochemical device (such as a capacitor, a primary battery or a secondary battery) is in a high-temperature condition or an internal short circuit occurs due to nail penetration and the like, so that the high-temperature safety of the electrochemical device is improved.

The invention relates to an electrochemical device. The electrochemical device comprises a positive pole piece, a negative pole piece and an electrolyte, wherein the positive pole piece comprises a current collector, a positive active material layer and a safety coating arranged between the current collector and the positive active material layer; the safety coating comprises a polymer matrix, a conductive material and an inorganic filler; and relative to the total weight of the polymer matrix, the conductive material and the inorganic filler, the weight percentage of the polymer matrix is 35wt%-75wt%, the weight percentage of the conductive material is 5wt%-25wt%, the weight percentage of the inorganic filler is 10wt-60wt%, the inorganic filler is an electrochemical active material or a conductive carbon-coated modified, conductive metal-coated modified or conductive polymer-coated modified material of the electrochemical active material, and the normal-temperature viscosity of the electrolyte is less than or equal to 4cp. The electrochemical device (e.g., a capacitor, a primary battery or a secondary battery, etc.) has improved safety performance and electrical performance.

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector, an electrode active material layer arranged on at least one surface of the current collector, and an electric connection component electrically connected with the current collector, the electrode active material layer is arranged onthe main body part of the current collector, the area is called as a membrane area, the electric connecting component and the current collector are welded and connected at the edge of the current collector, the welding area is called as an adapter welding area, wherein the transition area of the current collector between the membrane area and the adapter welding area, which is not coated with theelectrode active material layer, is called as an extension area, the current collector is a composite current collector, the electrode plate further comprises a heat conduction coating, and the heat conduction coating covers at least one part of the electric connection component in the adapter welding area.

The invention relates to the field of batteries, in particular to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector and an electrode active material layer arranged on at least one surface of the current collector, wherein the current collector comprises a support layer and a conductive layer arranged on at least one surface of the support layer, the thickness D2 of a single surface of the conductive layer is more than or equal to 30nm and less than or equal to 3mu m, the thickness D1 of the support layer is more than or equal to 1mu m and less than or equal to 30mu m, and the support layer is made of a high polymer material or a high polymer composite material; the electrode active material layer includes an electrode active material, a binder, and a conductive agent, and the electrode active material includes a small-particle active material having an average particle diameter D50 of 1.0 [mu] m to 7.0 [mu] m and a large-particleactive material having an average particle diameter D50 of 7.1 [mu] m to 20.0 [mu] m. The electrochemical device comprising the positive pole piece has high energy density, good safety performance (especially nail penetrating safety performance) and electrochemical performance.

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector, a positive active material layer and a safety coating arranged between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler, and when the safety coating andthe positive active material layer are collectively called as a diaphragm layer, the ductility of the diaphragm layer is greater than or equal to 30%. The positive pole piece can improve the nail penetration safety performance of an electrochemical device (such as a capacitor, a primary battery or a secondary battery).

The invention relates to a battery. The battery comprises a positive pole piece, a diaphragm and a negative pole piece, wherein the positive pole piece comprises a positive current collector and at least two positive active material layers coated on at least one surface of the positive current collector; the lower-layer positive active material layer in contact with the positive current collectorcomprises a first positive active material, a first polymer material and a first conductive material; based on the total weight of the lower-layer positive active material layer, the weight percentageof the first positive active material is A%, the weight percentage of the first polymer material is B%, and the weight percentage of the first conductive material is C%; the upper-layer positive active material layer which is in contact with the lower-layer positive active material layer and is away from the positive current collector comprises a second positive active material, a second polymermaterial and a second conductive material; based on the total weight of the upper-layer positive active material layer, the weight percentage of the second positive active material is A'%, the weightpercentage of the second polymer material is B'%, the weight percentage of the second conductive material is C'%, A% is less than A'%, B% is greater than B'%, C% is greater than or equal to C'%; and the first polymer material comprises an oily polymer material with the solubility in NMP at the temperature of 130 DEG C within 5min being 30% or less of the solubility of PVDF under the same conditions. The battery has good safety and improved electrical properties.

The invention relates to the field of batteries, in particular to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector and an electrode active material layer arranged on at least one surface of the current collector, the current collector comprises a supporting layer and a conductive layer arranged on at least one surface of the supporting layer, the single-side thickness D2 of the conductive layer meets the condition that D2 is larger than or equal to 30 nm and smaller than or equal to 3 microns, the conductive layer is made of aluminum oraluminum alloy, the density of the conductive layer is 2.5 g/cm<3>-2.8 g/cm<3>, and an adhesive bottom coating containing a conductive material and a binder is also arranged between the current collector and the electrode active material layer. The positive pole piece has good machinability, and the electrochemical device comprising the positive pole piece has high energy density, good electrochemical performance, good safety performance and long-term reliability.

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector, a positive active material layer and a safety coating arranged between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler; the polymer matrix comprises atleast two types of polymer materials; the first type of polymer material is polyvinylidene fluoride and/or polyvinylidene chloride; the solubility of the second type of polymer material in an oily solvent is less than that of the first type of polymer material; and the weight percentage of the first type of polymer material relative to the total weight of the polymer matrix, the conductive material and the inorganic filler is greater than or equal to 17.5%. The positive pole piece can quickly disconnect a circuit when an electrochemical device (such as a capacitor, a primary battery or a secondary battery) is in a high-temperature condition or an internal short circuit occurs, so that the high-temperature safety of the electrochemical device is improved.

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector, a positive active material layer and a safety coating arranged between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix and a conductive material, and the polymer matrix is polyvinylidene fluoride and/or polyvinylidene chloride. When the safety coating and the positive active material layer are collectively called as a positive diaphragm layer, the positive diaphragm layer contains Na ions and/orK ions of which the content is greater than or equal to 100ppm, and the infrared absorption spectrum of the positive diaphragm layer has an absorption peak at 1646cm<-1>. The positive pole piece can quickly disconnect a circuit when an electrochemical device (such as a capacitor, a primary battery or a secondary battery) is in a high-temperature condition or an internal short circuit occurs, so that the high-temperature safety of the electrochemical device is improved.

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector, a positive active material layer and a safety coating arranged between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler, the polymer matrix is polyvinylidene fluoride and/or polyvinylidene chloride, and the weight ratio of the polymer matrix to the conductive material is greater than or equal to 2. The positive pole piece can improve the nail penetration safety performance of an electrochemical device (such as a capacitor, a primary battery or a secondary battery).

The invention relates to a battery. The battery comprises a positive pole piece, a diaphragm, a negative pole piece and electrolyte, wherein the positive pole piece comprises a positive current collector and at least two positive active material layers coated on at least one surface of the positive current collector; the lower-layer positive active material layer in contact with the positive current collector comprises a first positive active material, a first polymer material and a first conductive material; based on the total weight of the lower-layer positive active material layer, the weight percentage of the first positive active material is A%, the weight percentage of the first polymer material is B%, and the weight percentage of the first conductive material is C%; the upper-layerpositive active material layer which is in contact with the lower-layer positive active material layer and is away from the positive current collector comprises a second positive active material, a second polymer material and a second conductive material; based on the total weight of the upper-layer positive active material layer, the weight percentage of the second positive active material is A'%, the weight percentage of the second polymer material is B'%, the weight percentage of the second conductive material is C'%, A% is less than A'%, B% is greater than B'% and C% is greater than or equal to C'%; and the first polymer material comprises a polyvinylidene fluoride and/or polyvinylidene chloride polymer material. The battery has good safety and improved electrical properties, and the normal-temperature viscosity of the electrolyte is less than or equal to 4cp.

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector and an electrode active material layer arranged on at least one surface of the current collector, wherein the current collector comprises a supporting layer and a conductive layer arranged on at least one surface of the supporting layer, the thickness D2 of a single surface of the conductive layer is greater than or equal to 30nm and less than or equal to 3mu m, the supporting layer is made of a high polymer material or a high polymer composite material, and the thickness D1 of the supporting layer is greater than or equal to 1mu m and less than or equal to 30mu m; wherein the electrode active material layer includes an electrode active material, a binder, and a conductive agent, and the coated electrode active material layer includes three regions based on a compaction density when viewed from a width direction of a coated surface of the electrode sheet, and a compaction density of a middle region is higher than compaction densities of both side regions. The electrode pole piece and the electrochemical device have high energy density and good electrical performance and safety.

The invention discloses a positive pole current collector, a positive pole piece and an electrochemical device. The positive pole current collector comprises a support layer and a conductive layer arranged on the support layer, the conductive layer is made of aluminum or aluminum alloy, and the thickness D1 of the conductive layer is greater than or equal to 300nm and less than or equal to 2mu m;the elongation at break B of the supporting layer is greater than or equal to 12% and greater than or equal to 10000%; the volume resistivity of the supporting layer is greater than or equal to 1.0 *10 <5> ohm.m; when the tensile strain of the positive electrode current collector is 2%, the square resistance growth rate T1 of the conductive layer is less than or equal to 10%. The positive electrode current collector provided by the invention can give consideration to relatively high safety performance and electrical performance at the same time, so that the positive electrode piece and the electrochemical device adopting the positive electrode current collector can give consideration to relatively high safety performance and electrochemical performance at the same time.