Abstract: A battery module includes: a plurality of second battery cells, each including an electrode lead connected to an electrode assembly, a terrace portion of a cell body member in which the electrode assembly is accommodated, and a sealing portion connected to the terrace portion; a housing unit in which the plurality of secondary battery cells are accommodated; and a guard unit including a first area, facing at least a portion of the terrace portion, to delay swelling or bursting of the sealing portion of at least one of the plurality of secondary battery cells. The guard unit has a shape in which a first gap is smaller than a thickness of the cell body member to limit expansion of a thickness of the terrace portion, the first gap being a distance between internal surfaces of the first area.

Abstract: Provided is a method for determining the wetting degree of a lithium ion battery cell using a low current test. The wetting degree determination method according to the present disclosure includes a) obtaining, as a reference charge profile, a charge profile recorded while charging a reference battery cell having undergone receiving an electrode assembly and an electrolyte solution in a case, assembling and pre-aging with a low current of 0.01 C-rate or less, b) measuring and recording a charge profile while charging another battery cell having undergone receiving an electrode assembly and an electrolyte solution in a case, assembling and pre-aging with a low current of 0.01 C-rate or less in the same way as the reference battery cell, and c) determining the wetting degree of another battery cell relative to the reference battery cell by comparative analysis of the reference charge profile and the measured charge profile.

Abstract: An object of the present invention is to provide a reduced graphene-based material to improve charge/discharge efficiency of a lithium ion secondary battery. The reduced graphene-based material of the present invention has a coating containing lithium element (Li), phosphorus element (P), fluorine element (F), and oxygen element (O) on at least a part of the surface, wherein in the elemental composition of the surface as measured by X-ray photoelectron spectroscopy (XPS), the proportion of lithium element (Li) is 0.8 to 2.0 (atomic %), the proportion of phosphorus element (P) is 0.5 to 2.0 (atomic %), the proportion of fluorine element (F) is 0.05 to 1.0 (atomic %), and the proportion of oxygen element (O) is 7.0 to 12.0 (atomic %).

Abstract: The present application relates to an electrochemical device comprising a separator and an electrolyte, wherein the separator comprises a first porous layer and a second porous layer; and the electrolyte comprises at least one compound containing 2 to 3 cyano groups.

Abstract: The present invention provides an electrode for a lithium secondary battery, the electrode including an electrode current collector, an electrode active material layer formed on the electrode current collector, and an insulating layer formed on the electrode current collector and overlapping the electrode active material layer in a partial region. Here, a thickness of the electrode active material layer in the region in which the electrode active material layer and insulating layer do not overlap is d1, a thickness of the insulating layer in the region in which the electrode active material layer and insulating layer do not overlap is d2, and d2/d1 is 0.02 to 0.4.

Abstract: An electrochemical device of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator. The separator includes a first porous layer composed mainly of a thermoplastic resin and a second porous layer composed mainly of insulating particles with a heat-resistant temperature of 150° C. or higher. The first porous layer is disposed to face the negative electrode.

Abstract: This application discloses a battery cushion and a forming method thereof, and a battery module and a forming method thereof. The battery cushion includes a body and breakable bubbles. The breakable bubbles are disposed in the body. The breakable bubbles include at least a first bubble and a second bubble. A breaking pressure of the first bubble is less than a breaking pressure of the second bubble, so that the battery cushion can release a space occupied by the battery cushion in a progressive manner under different external forces. The battery cushion disclosed in this application can not only achieve a pre-tightening force required during assembly of the battery module but also effectively relieve an expansive force generated during working of the battery module.

Abstract: A battery module includes: a plurality of secondary battery cells, each including an electrode lead connected to an electrode assembly, a terrace portion forming a periphery of a cell body member in which the electrode assembly is accommodated, and a sealing portion formed to be connected to the terrace portion; a housing in which the plurality of secondary battery cells are accommodated; and a guard unit installed to face at least a portion of the terrace portion and at least a portion of the sealing portion to delay bursting of the sealing portion of at least one of the secondary battery cells. In the guard unit, a gap between internal surfaces facing the terrace portion is formed to be smaller than a thickness of the cell body member to limit expansion thickness of the terrace portion.

Abstract: A lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution that includes an alkoxy compound represented by CmX2m+1—O—(CX2)n—OH. Each X represents hydrogen (H) or a halogen, m is an integer of 1 or greater, n is an integer of 1 or greater, and (m+n) is 4 or greater.

Abstract: A secondary battery includes a wound electrode body having a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode are stacked on each other with the separator interposed therebetween and are wound about a winding axis. The wound electrode body has a section perpendicular to the winding axis. The section has an elongated shape that includes a flat part and a pair of curved parts. The curved parts oppose each other with the flat part interposed therebetween. The negative electrode includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector. A ratio of a second distance to a first distance is less than 1.

Abstract: The invention relates to nanostructured hybrid polymer composite membranes and methods for producing same. Specifically, the invention relates to nanofiber membranes produced through various methods, including electrospinning of at least one polymer into a non-woven nanofiber structure. The disclosed nanofiber membranes may also be compressed to further provide unique physical, chemical, and thermal properties that make such membranes suitable for a range of specific applications, including, but not limited to, use as nanostructured separators in lithium-ion batteries.

Abstract: An object is to improve the characteristics of a power storage device such as a charging and discharging rate or a charge and discharge capacity. The grain size of particles of a positive electrode active material is nano-sized so that a surface area per unit mass of the active material is increased. Specifically, the grain size is set to greater than or equal to 10 nm and less than or equal to 100 nm, preferably greater than or equal to 20 nm and less than or equal to 60 nm. Alternatively, the surface area per unit mass is set to 10 m2/g or more, preferably 20 m2/g or more, further, the crystallinity of the active material is increased by setting an XRD half width to greater than or equal to 0.12° and less than 0.17°, preferably greater than or equal to 0.13° and less than 0.16°.

Abstract: The present invention aims to provide an electrolyte composition from which an electrolyte film having a higher battery performance than typical electrolyte films is obtained. The present invention provides an electrolyte composition containing an alkali metal salt. The composition further contains a photocurable and/or thermosetting monomer; and a salt dissociating agent. A content ratio of the alkali metal salt is 50% by mass or more relative to 100% by mass of the total amount of the alkali metal salt, the photocurable and/or thermosetting monomer, and the salt dissociating agent.

Abstract: This application discloses a battery box, a battery pack, and a vehicle. The battery box includes: a lower box, including a bottom plate and a side plate connected to and disposed around the bottom plate; an upper box, connected to the side plate, where the upper box contains a cover plate disposed in opposition to the bottom plate, and the upper box and the lower box jointly close in to form an accommodation chamber; and a connector, disposed in the accommodation chamber and connected to the upper box and the lower box. The connector contains a guide channel, and the guide channel runs through the bottom plate and the cover plate along a first direction. The battery box, the battery pack, and the vehicle in this application satisfies requirements on strength of the battery box and connection strength between the battery pack and the vehicle.

Abstract: A main object is to provide a method of producing a cathode active material having a high average discharge potential, and a high degree of stability at high potential. A step of preparing a Na-doped precursor of making a transition metal oxide having a P2 structure belonging to a space group of P63/mmc; and an ion exchange step of substituting lithium for at least part of sodium contained in the transition metal oxide by an ion exchange method are included, wherein the transition metal oxide has the composition represented by NaaMnx?pNiy?qCoz?rM1p+q+rO2, where 0.5?a?1, x+y+z=1, 3?4x+2y+3z?3.5, and 0.05?p+q+r<0.25, M1 is Al or Mo, when M1 is Al, p is not equal to q, and any one of p and q is not 0.

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: The present disclosure is directed to an electric power tool system with cordless power tools and removable, rechargeable battery packs that mate with the power tools to provide stored energy to the power tools. The battery packs may include a first battery pack having a basic interface and a second battery pack having an advanced interface. The power tools may include a first power tool having a basic interface and a second power tool having an advanced interface. The basic interface battery pack may mate with both the basic interface power tool and the advanced interface power tool. The advanced interface battery pack may mate with both the basic interface power tool and the advanced interface power tool.

Abstract: A battery pack includes a main frame supporting a battery cell, the main frame including a hook hole and a reinforcer adjacent to the hook hole; and a main cover coupled to the main frame, the main cover including a hook inserted into and retained in engagement with the hook hole, wherein the reinforcer faces the hook hole with the hook therebetween to support the hook.

Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide particle and a thio-based compound formed on at least portion of a surface of the lithium metal oxide particle. The thio-based compound has a double bond that contains a sulfur atom. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the thio-based compound.

Abstract: Aspects of the disclosure relate to a service port for an electrical power supply such as a battery. The service port may be an integrated pressure equalization and electrical probe port. In one or more implementations, the service port may include a housing have an open bore within which an electrical header is disposed. A gap may be provided between the electrical header and the housing to allow airflow though the service port into and/or out of an internal chamber of the electrical power supply for pressure equalization of the internal chamber. In one or more implementations, a breather element may be disposed in a distal end of the housing of the service port.