Abstract: A negative electrode plate having a negative electrode material layer. The negative electrode material layer of the negative electrode plate includes a silicon-based particle and a graphite particle. In a silicon-based particle of a diameter larger than 3 ?m, a Si content in a superficial region is lower than a Si content in an inner region. In this way, a surface stress of the negative electrode plate is reduced, thereby improving stability of an interface between a silicon-based particle and an electrolytic solution, and in turn, effectively improving the cycle performance of the electrochemical device and alleviating the problem of expansion and deformation.

Abstract: A positive electrode material, including at least one of element Al or element Zr; and particles of the positive electrode material satisfies 0.01?(Dv99a-Dv99b)/Dv99b?0.5, where Dv99a and Dv99b are Dv99 values of the particles of the positive electrode material measured before and after ultrasonic treatment respectively. The positive electrode material can improve processability of positive electrode materials and cycling performance of electrochemical apparatuses.

Abstract: A battery charging method is provided, including: constant-current charging the battery with a first charge current I1 to a first voltage U1 and constant-voltage charging the battery with the first voltage U1 to a first charge cut-off current I1? (S1); constant-current charging the battery with the first charge current I1 to a second voltage U2, where U2 is a limited charge voltage of the battery, and U2>U1 (S2); and constant-current charging the battery with a second charge current I2 to a third voltage U3 and constant-voltage charging the battery with the third voltage U3 to a second charge cut-off current I2?, where U3>U2, I2<I1, and I1??I2? (S3). An electronic apparatus and a medium are provided, which can shorten the time of a battery being at high voltage, thus alleviating capacity decay of the battery during charge-discharge cycles.

Abstract: An electrochemical apparatus includes an electrode assembly, where the electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator for separating the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector, a positive electrode active material layer, and a non-active material layer. The positive electrode active material layer is formed on a surface of the positive electrode current collector, and the non-active material layer is formed on a surface of the positive electrode active material layer away from the positive electrode current collector. In a first direction, the non-active material layer has a thickness of 1 µm to 20 µm, where the first direction is a thickness direction of the positive electrode current collector. A diffusion rate of lithium ions in the non-active material layer is less than that in the positive active material layer.

Abstract: An electrochemical device includes an electrode assembly, a packaging bag accommodating the electrode assembly, and electrode terminals connected to the electrode assembly. The packaging bag includes a first seal edge, a third seal edge, a first sidewall connected to the first seal edge, a second sidewall connected to the third seal edge, and a third sidewall. The first sidewall includes a first section connected to the second sidewall; and an arc-shaped second section connected to the third sidewall and the first section. The first seal edge includes a first hem connected to the first section and a second hem connected to the first hem. The first hem is disposed along the thickness direction of the electrode assembly. The second hem includes a first part and a second part. The second part is connected to the second section and the first part and abuts against the second section.

Abstract: A separator and a lithium-ion battery. The separator includes a porous substrate, and a first coating layer arranged on at least one surface of the porous substrate, wherein the first coating layer includes an aromatic polyamide. An aramid coating layer is used; the aromatic polyamide in the aramid coating layer swells or plasticizes under the action of a solvent and a lithium salt in the electrolyte at high temperature or normal temperature, to increase the elongation of the separator, while improving the safety performance of the lithium-ion battery by interaction between the aramid coating layer and the electrode active material or the binder.

Abstract: A heat exchange pipe joint includes a first pipe and a second pipe that are separately formed and in communication with each other. The first pipe is detachably connected to a second side of the installation plate, and the second pipe is detachably connected to a first side of the installation plate. When the heat exchange pipe joint is applied to the battery pack, the heat exchange pipe joint in a split-structure requires a small operation space for detachment and installation. In this case, a process of taking out the entire heat exchange pipe joint from the case can be avoided. In this way, the detachment and installation of the heat exchange pipe joint can be easy and convenient, thereby facilitating the reparation process thereof.

Abstract: A negative electrode includes a current collector and an active substance layer arranged on the current collector, and an ionic conductivity of the active substance layer is 0.01 S/m to 1 S/m. The ionic conductivity of the active substance layer is defined as 0.01 S/m to 1 S/m, so that the electrochemical device can meet requirements for fast charging, and meanwhile, lithium plating on a surface of the negative electrode of the electrochemical device can be inhibited in a fast-charging condition, ensuring safety performance of the electrochemical device.

Abstract: An electrochemical apparatus, including a positive electrode, a negative electrode, and an electrolyte, where the negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, and the negative electrode current collector contains tin; and the electrolyte contains a sulfur-oxygen double bond-containing compound. The electrochemical apparatus has improved high-temperature cycling performance and overcharge protection performance.

Abstract: An electrochemical apparatus, including a positive electrode, a negative electrode, and an electrolyte, where the electrolyte includes fluoroethylene carbonate and non-fluorinated cyclic carbonate, the fluoroethylene carbonate accounts for a % of the electrolyte by mass, and the non-fluorinated cyclic carbonate accounts for b % of the electrolyte by mass, where 0.05?a/b?2.5.

Abstract: An electrochemical device includes a housing, an electrode assembly, and an insulating tape. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The insulating tape includes a body portion and a first connecting portion. The electrode assembly includes a first surface and a second surface opposite to each other. The body portion is disposed on the first surface, and is fixedly bonded to the electrode assembly and the housing separately. The first connecting portion is formed together with the body portion in one piece. A first end of the first connecting portion is connected to the body portion, and a second end of the first connecting portion is disposed on the second surface, and is fixedly bonded to the electrode assembly and the housing separately. The first connecting portion is bonded to an edge of the separator.

Abstract: An electrochemical apparatus including a negative electrode active substance. The negative electrode active substance includes a first active substance and a second active substance, a discharge capacity per unit mass of the first active substance is smaller than that of the second active substance, and a life cycle of the electrochemical apparatus includes N cycle segments arranged sequentially, where N is a positive integer greater than or equal to 2, each cycle segment includes at least one charge-discharge cycle of the electrochemical apparatus, and the electrochemical apparatus is charged and discharged cyclically based on the ith discharge cut-off voltage in the ith cycle segment, where 1?i?N and the ith discharge cut-off voltage between the 1st discharge cut-off voltage and the (N?1)th discharge cut-off voltage is smaller than the (i+1)th discharge cut-off voltage.

Abstract: A separator includes: a first porous substrate; and a second porous substrate arranged on at least one surface of the first porous substrate; wherein the elongation at break of the second porous substrate is greater than the elongation at break of the first porous substrate in at least one of the machine and transverse directions of the separator. The separator has a high tensile strength and an elongation at break and good heat resistance, and may improve the safety performance of the energy storage device when the separator is applied to the energy storage device.

Abstract: Embodiments of the present application provide a sleeve assembly, a cover plate assembly, a battery, and an electricity-consuming apparatus. The sleeve assembly is used for sealing a through hole. The sleeve assembly includes: a sleeve with an opening on at least one end; a nail body including a body portion. The size of the body portion is larger than the size of the barrel diameter of the sleeve. The body portion is configured to be inserted into the sleeve through the opening and press the inner wall of the sleeve after the sleeve is inserted into the through hole in the axial direction so as to form a protrusion for riveting the sleeve to the through hole on the outer wall of the sleeve.

Abstract: An electrochemical apparatus includes an electrode. The electrode includes a current collector. The current collector includes a coated region provided with an active material and an uncoated region provided with no active material. The uncoated region is at least partially provided with an insulation layer. The insulation layer includes a binder and inorganic particles. A swelling rate of the insulation layer is not higher than 8% after the insulation layer is immersed in an electrolyte at 85° C. for 24 h.

Abstract: A negative electrode plate includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material. The negative electrode active material contains a silicon-based active material, and a mass percentage of the silicon-based active material based on a mass of the negative electrode active material is X%. The electrolyte contains metal ions. Based on mass of the electrolyte, a mass proportion of the metal ions is A ppm, and 0<X/A?8.

Abstract: An electrochemical device includes a packaging bag, an electrode assembly, and a binder. The electrode assembly is disposed in the packaging bag. The binder is configured to bond the electrode assembly to the packaging bag. The binder includes a first bonding layer, a substrate layer, and a second bonding layer that are stacked in sequence. The first bonding layer adheres to a surface of the electrode assembly. The second bonding layer adheres to a surface that is of the packaging bag and that is close to the electrode assembly. A peel strength between the first bonding layer and the electrode assembly is F1, a peel strength between the second bonding layer and the packaging bag is F2, and the peel strengths satisfy 50 N/m?F1?1000 N/m and 1?F1/F2?10. A tensile strength of the substrate layer is 100 MPa to 2000 MPa.

Abstract: An anode material having 0.8?0.06×(Dv50)2?2.5×Dv50+Dv99?12 (1); and 1.2?0.2×Dv50?0.006×(Dv50)2+BET?5 (2), where Dv50 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 50% of the particles, Dv99 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 99% of the particles, and BET is a specific surface area of the anode material, wherein Dv50 and Dv99 are expressed in ?m and BET is expressed in m2/g. The anode material is capable of significantly improving the rate performance of electrochemical devices.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 2.3, about 5 wt %?Z?about 50 wt %, 1 wt %<Y<5 wt %, and about 0.02?(Y/Z)?about 0.3; wherein wherein the dinitrile compound is one or more compounds selected from the group consisting of butanedinitrile, adiponitrile, and 1,4-dicyano-2-butene; and the trinitrile compound is one or more compounds selected from the group consisting of 1,3,6-hexanetricarbonitrile, 1,2,6-hexanetricarbonitrile and 1,2,3-tris(2-cyanoethoxy)propane.

Abstract: The present disclosure provides a cell and an electrochemical device. The cell comprises: a first electrode plate comprising a first current collector and a first active material layer, a second electrode plate comprising a second current collector and a second active material layer; a first electrode tab, a second electrode tab, a separator. The first current collector has a first surface uncoated region; the second current collector has a second surface uncoated region; the first electrode tab is provided on the first surface uncoated region, the second electrode tab is provided on the second surface uncoated region. The first electrode tab and/or the second electrode tab are enlarged in length and width. When the cell is subjected to a mechanical shock, the first electrode tab and the second electrode tab are deformed to puncture the separator therebetween, so the first current collector and the second current collector are electrically connected.