Abstract: Disclosed are an electrolyte for lithium secondary batteries including 10 to 50% by weight of a cyclic carbonate compound, and 50 to 90% by weight of a linear ester compound, based on the total weight of a non-aqueous solvent, wherein a content of ethyl propionate of the linear ester compound is 20 to 60% by weight, based on the total weight of the non-aqueous solvent, and a lithium secondary battery including the electrolyte and exhibiting superior low-temperature characteristics.

Abstract: Disclosed herein is a prismatic battery cell including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, the electrode assembly having a positive electrode terminal and a negative electrode terminal protruding from at least one side of the positive electrode and the negative electrode, two or more case members coupled to each other so as to have a shape corresponding to the external shape of the electrode assembly such that the case members surround the electrode assembly, the case members having a predetermined opening, through which one surface of the electrode assembly, at least, corresponding to protruding portions of the positive electrode terminal and the negative electrode terminal is exposed, and a cap plate coupled to the opening of the case members in a sealed state.

Abstract: Disclosed is a case for secondary batteries including a laminate sheet composed of multiple layers, the laminate sheet including an insulating layer having an elongation percentage of 10% or more.

Abstract: Disclosed are an electrolyte for lithium secondary batteries including 10 to 50% by weight of a cyclic carbonate compound, and 50 to 90% by weight of a linear ester compound, based on the total weight of a non-aqueous solvent, wherein a content of ethyl propionate of the linear ester compound is 20 to 60% by weight, based on the total weight of the non-aqueous solvent, and a lithium secondary battery including the electrolyte and exhibiting superior low-temperature characteristics.

Abstract: Disclosed are an electrolyte for lithium secondary batteries including 10 to 50% by weight of a cyclic carbonate compound, and 50 to 90% by weight of a linear ester compound, based on the total weight of a non-aqueous solvent, wherein a content of ethyl propionate of the linear ester compound is 20 to 60% by weight, based on the total weight of the non-aqueous solvent, and a lithium secondary battery including the electrolyte and exhibiting superior low-temperature characteristics.

Abstract: According to the present invention, grip feeling of an electronic device to which the battery is mounted may be improved by optimizing a shape of a battery, and miniaturization of the electronic device may be promoted at the same time. In order to achieve the above-described object, a battery is disclosed, the battery including: a first surface having a circumference of a closed curve having a curve; a second surface having a circumference of a closed curve having a curve; and a volume portion configured to connect the first surface to the second surface and defining a volume, wherein at least one of the first surface and the second surface has a circumference of the closed curve defined by connecting ends of each of two curves curved in the same direction to each other, and the first surface has an area different from that of the second surface.

Abstract: An electrode assembly includes a plurality of unit cells, each including a positive electrode, a negative electrode, and a separator disposed therebetween, and a single separation sheet disposed between the unit cells while surrounding side surfaces thereof. First and second stack parts of unit cells are wound with the separation sheet from each end of the separation sheet toward the middle of the separation sheet, a facing unit cell has one surface that contacts the first stack part with the separation sheet between the one surface of the facing unit cell and the first stack part and the other surface that contacts the second stack part with the separation sheet between the other surface of the facing unit cell and the second stack part, and the unit cells are stacked such that electrodes having opposite polarities are disposed in contact with each other with the separation sheet therebetween.

Abstract: Disclosed herein is a battery pack configured to have a structure including a plate-shaped battery cell having electrode terminals formed at one side thereof including a sealed surplus part and a protection circuit module (PCM) mounted at the sealed surplus part, wherein each of the electrode terminals of the battery cell is made of a plate-shaped conductive member, the PCM includes a protection circuit board (PCB), a safety element electrically connected between one of the electrode terminals of the battery cell and the PCB or loaded on the PCB, an external input and output terminal electrically connected to a protection circuit of the PCB, and an electrically insulative module case in which the PCB and the safety element are mounted in a state in which the external input and output terminal extends outside, the PCM is loaded on the sealed surplus part of the battery cell in a state in which the PCM is received in the module case such that the PCM is electrically connected to the electrode terminals of the b

Abstract: A battery cell configured to have a structure in which an electrode assembly, including a positive electrode, a negative electrode, and a separator interposed therebetween, is mounted in a battery case, the electrode assembly including two or more unit cells having different planar sizes, the unit cells being stacked in the height direction on the basis of a plane, at least one first unit cell selected from among the unit cells has an asymmetric structure formed on at least one side of the outer edge thereof on the basis of a middle axis crossing a main body of the first unit cell when viewed from above, and at least one second unit cell selected from among the unit cells has an indented portion indented from at least one side of the second unit cell toward the middle of the second unit cell.

Abstract: According to the present invention, grip feeling of an electronic device to which the battery is mounted may be improved by optimizing a shape of a battery, and miniaturization of the electronic device may be promoted at the same time. In order to achieve the above-described object, a battery is disclosed, the battery including: a first surface having a circumference of a closed curve having a curve; a second surface having a circumference of a closed curve having a curve; and a volume portion configured to connect the first surface to the second surface and defining a volume, wherein at least one of the first surface and the second surface has a circumference of the closed curve defined by connecting ends of each of two curves curved in the same direction to each other, and the first surface has an area different from that of the second surface.

Abstract: Disclosed herein is a battery pack configured to have a structure including a plate-shaped battery cell having electrode terminals formed at one side thereof including a sealed surplus part and a protection circuit module (PCM) mounted at the sealed surplus part, wherein each of the electrode terminals of the battery cell is made of a plate-shaped conductive member, the PCM includes a protection circuit board (PCB), a safety element electrically connected between one of the electrode terminals formed at one side of the battery cell and the PCB or loaded on the PCB, an external input and output terminal electrically connected to a protection circuit of the PCB, and an electrically insulative module case in which the PCB and the safety element are mounted in a state in which the external input and output terminal extends outside, the module case is configured to have a structure in which two outer surfaces of the module case are open outward to form a first open surface and a second open surface, the module cas

Abstract: Disclosed herein is a method of manufacturing a battery cell having a structure in which an electrode assembly including a positive electrode, a separator, and a negative electrode is mounted in a battery case, and the battery case is sealed by thermal welding, the method including (a) mounting the electrode assembly in a receiving part of the battery case and forming sealed portions at an outer edge of the receiving part by thermal welding, (b) perpendicularly bending the sealed portions and bringing the bent sealed portions into contact with an outer side wall of the receiving part, (c) mounting and fixing the battery case processed at step (b) in a jig provided with a depressed part having a size corresponding to that of the battery case, and (d) injecting a curable material into a space defined between the outer side wall of the receiving part of the battery case and an inner side wall of the depressed part of the jig and curing the injected curable material.

Abstract: Provided is a battery pack. The battery pack includes a battery module including first and second battery cells that are disposed adjacent to each other, wherein first and second electrode terminals are disposed on each of the first and second electrode terminals, a fuse part including a first fuse connecting the second electrode terminal of the first battery cell to the first electrode terminal of the second battery cell, and a switching device including a first switch disposed outside a top surface of the first battery cell of the battery module and connected to the first fuse and a second switch disposed below the first switch and connected to the second electrode terminal of the second battery cell.

Abstract: Disclosed herein is a prismatic battery cell wherein a cap plate is mounted at an open top of a prismatic cell case in a state in which an electrode assembly configured to have a structure in which a separator is disposed between a cathode and an anode is mounted in the prismatic cell case, the cap plate is provided with an anode terminal or a cathode terminal as a protruding terminal, and the prismatic cell case is configured to have a structure in which two or more case members divided in a major axis direction, in a minor axis direction, or in the major axis direction and the minor axis direction based on a horizontal sectional shape of the cap plate with respect to the protruding terminal are coupled to each other.

Abstract: The present invention relates to a battery module, which includes one or more battery cell units, and the battery cell unit includes a battery cell, a fixing member located surrounding an outer circumference surface of the battery cell, and a heat absorbing material located between the battery cell and the fixing member, and as a result, heat generation inside the battery module is suppressed, and ignition between the series-connected battery cell units may be suppressed. Accordingly, excellent charge and discharge efficiency, an excellent cycle property and a lifespan property of the battery may be exhibited without concern for explosion or ignition of the battery module.

Abstract: Disclosed herein is a battery pack configured to have a structure in which a protection circuit module (PCM) is mounted at a sealed surplus part of a battery cell at which electrode terminals of the battery cell are located, wherein the PCM includes a protection circuit board (PCB), a safety element, and an electrically insulative module case for surrounding the PCB and the safety element, the module case includes an upper case and a lower case coupled to each other through an assembly type fastening structure for receiving the PCB and the safety element, the module case, the PCB, and the electrode terminals are provided with first openings and second openings having a sufficient size to allow a first joint fastening member and a second joint fastening member to extend therethrough, and the PCB is received between the upper case and the lower case such that the PCB is electrically connected to the electrode terminals of the battery cell in a state in which the PCB is coupled to the electrode terminals of the

Abstract: Disclosed are an electrolyte for lithium secondary batteries including 10 to 50% by weight of a cyclic carbonate compound, and 50 to 90% by weight of a linear ester compound, based on the total weight of a non-aqueous solvent, wherein a content of ethyl propionate of the linear ester compound is 20 to 60% by weight, based on the total weight of the non-aqueous solvent, and a lithium secondary battery including the electrolyte and exhibiting superior low-temperature characteristics.

Abstract: Disclosed herein is an electrode assembly including a plurality of unit cells, each of which is configured to have a structure including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a single separation sheet disposed between the unit cells while surrounding side surfaces of the unit cells, wherein the unit cells include unit cells wound together with the separation sheet from one end of the separation sheet toward the middle of the separation sheet to constitute a first stack part, unit cells wound together with the separation sheet from the other end of the separation sheet toward the middle of the separation sheet to constitute a second stack part, and a facing unit cell having one surface that contacts the first stack part in the state in which the separation sheet is disposed between the one surface of the facing unit cell and the first stack part and the other surface that contacts the second stack part in the state in

Abstract: Disclosed herein is a prismatic battery cell including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, the electrode assembly having a positive electrode terminal and a negative electrode terminal protruding from at least one side of the positive electrode and the negative electrode, two or more case members coupled to each other so as to have a shape corresponding to the external shape of the electrode assembly such that the case members surround the electrode assembly, the case members having a predetermined opening, through which one surface of the electrode assembly, at least, corresponding to protruding portions of the positive electrode terminal and the negative electrode terminal is exposed, and a cap plate coupled to the opening of the case members in a sealed state.

Abstract: Disclosed is a case for secondary batteries including a laminate sheet composed of multiple layers, the laminate sheet including an insulating layer having an elongation percentage of 10% or more.