A battery module includes: a plurality of battery cells which have positive electrode tabs and negative electrode tab formed at both ends thereof, respectively, wherein the plurality of battery cells are stacked; a first bus bar assembly having first bus bars to which the positive electrode tabs and the negative electrode tabs located at one end of the battery cells are connected; a second bus bar assembly having second bus bars to which the positive electrode tabs and the negative electrode tabs located at the other end of the battery cells are connected; and a sensing unit which is connected to any one bus bar of the first and second bus bars to detect states of the battery cells.

Disclosed herein is a method for manufacturing an electrode assembly. The method may include a step of applying an electrode active material to at least a portion of an electrode collector, which is formed by sequentially stacking a first electrode foil, an electrode insulating layer, and a second electrode foil, to manufacture an electrode, a step of stacking the electrode and a separator, and a step of connecting an electrode lead to a non-coating portion that is not coated with the electrode active material on the electrode collector. The step of connecting the electrode lead may include passing a coupling part through the electrode collector and the electrode lead to connect the electrode collector to the electrode lead.

A method for manufacturing an electrode assembly according to an embodiment of the present invention may include applying a positive electrode active material to at least a portion of a positive electrode collector, applying a negative electrode active material to at least a portion of a negative electrode collector, The method may include interposing a separator between a positive electrode and a negative electrode, and respectively removing a positive electrode insulating layer and a negative electrode insulating layer from at least partial areas of a positive electrode tab, which is not coated with the positive electrode active material, and an negative electrode tab, which is not coated with the negative electrode active material in the negative electrode collector. The method may include connecting a positive electrode lead and a negative electrode lead to the positive electrode tab and the negative electrode tab, respectively.

Provided is a secondary battery and a comb-type electrode. A negative electrode layer sheet formed by stacking a negative electrode active material layer on two surfaces of a negative electrode current collector and a positive electrode layer sheet formed by stacking a positive electrode active material layer on two surfaces of a positive electrode current collector are alternately stacked, and an electrolyte body is interposed between the negative electrode layer sheet and the positive electrode layer sheet adjacent in a stacking direction. Each of the negative electrode current collector and the positive electrode current collector includes a bent connecting part sandwiching a notch part and formed by bending two sides in directions opposite to each other. The bent connecting parts of the negative electrode current collectors adjacent in the stacking direction and the bent connecting parts of the positive electrode current collectors adjacent in the stacking direction are connected.

The present disclosure relates to an electrode assembly. The electrode assembly can include a coating portion coated with an electrode active material and an electrode provided with an electrode tab without the electrode active material. The electrode can include a crack spreading prevention part, The crack spreading prevention part can include a crack spreading prevention hole formed in the electrode and an insulating coating layer provided on a circumferential surface of the crack spreading prevention hole.

The present disclosure relates to an electrode assembly. The electrode assembly can include a coating portion coated with an electrode active material and an electrode provided with an electrode tab without the electrode active material. The electrode can include a crack spreading prevention part, The crack spreading prevention part can include a crack spreading prevention hole formed in the electrode and an insulating coating layer provided on a circumferential surface of the crack spreading prevention hole.

A battery including a separator film, a plurality of cathodes, each having a cathode base, a first end of each cathode base having a cathode connection portion extending contiguously across the width of the cathode base and free of a cathode material, the battery including a plurality of anodes, each having an anode base, a first end of each anode base having an anode connection portion extending contiguously across the width of the anode base and free of an anode material, and the anode connection portion. The cathodes and anodes are in an electrode stack with alternating anodes and cathodes and each separated by a portion of the separator film. Each cathode connection portion of each cathode connected to a bus bar at a first end of the battery, and each anode connection portion electrically connected to a bus bar disposed at a second end of the battery.

A cylindrical battery includes: an outer can in the shape of a bottomed cylinder; a sealing body which closes one end of the outer can; an electrode body disposed inside the outer can; and an insulating resin component disposed between the outer can and the sealing body. The sealing body includes a metal component which is connected to a positive electrode lead that leads out from the electrode body. The metal component has an easily broken portion radially inward of the connecting portion of the metal component and the positive electrode lead, and is crimp-secured by means of the outer can, with the resin component interposed therebetween. The resin component is crimp-secured by means of the metal component, on the radially inner side of the metal component relative to the easily broken portion.

A cylindrical battery includes: an outer can in the shape of a bottomed cylinder; a sealing body which closes one end of the outer can; an electrode body disposed inside the outer can; and an insulating resin component disposed between the outer can and the sealing body. The sealing body includes a metal component which is connected to a positive electrode lead that leads out from the electrode body. The metal component has an easily broken portion radially inward of the connecting portion of the metal component and the positive electrode lead, and is crimp-secured by means of the outer can, with the resin component interposed therebetween. The resin component is crimp-secured by means of the metal component, on the radially inner side of the metal component relative to the easily broken portion.

A battery assembly can be formed on a base layer provided on a substrate, with a thin film battery stack including an anode layer, a cathode layer, and an electrolyte layer between the anode and cathode layers. The thin film battery stack can be attached to a pattern film layer with holes for electrical connection to the anode and cathode layers.