A battery module includes a plurality of secondary batteries, each including an electrode assembly and an electrolyte accommodated in an inner space of an exterior case. The battery module also includes an electrode lead having a body and a plate-shaped head portion. A first end of the body is electrically connected to a positive electrode plate or a negative electrode plate of the electrode assembly, and a second end of the body protrudes outward from the exterior case. The plate-shaped head extends in both directions perpendicular to the protruding direction of the body from the second end. The battery module also includes a bus bar having a plate shape with a slit extending inwardly from one end thereof so as to receive a portion of the body. The electrode lead and the bus bar may be at least partially made of an electrically conductive material.

A battery module includes a plurality of secondary batteries, each including an electrode assembly and an electrolyte accommodated in an inner space of an exterior case. The battery module also includes an electrode lead having a body and a plate-shaped head portion. A first end of the body is electrically connected to a positive electrode plate or a negative electrode plate of the electrode assembly, and a second end of the body protrudes outward from the exterior case. The plate-shaped head extends in both directions perpendicular to the protruding direction of the body from the second end. The battery module also includes a bus bar having a plate shape with a slit extending inwardly from one end thereof so as to receive a portion of the body. The electrode lead and the bus bar may be at least partially made of an electrically conductive material.

Systems, methods, and apparatus for a structurally cross-tied energy cell are disclosed. In one or more embodiments, a battery comprises a plurality of battery cells, each comprising an anode layer and a cathode layer. The battery further comprises a plurality of anode cross ties electrically connected to at least some of the anode layers of the battery. Further, the battery comprises a plurality of cathode cross ties electrically connected to at least some of the cathode layers of the battery. In one or more embodiments, the anode cross ties and the cathode cross ties run through all of the battery cells of the battery. In at least one embodiment, the anode cross ties and the cathode cross ties are manufactured from an electrical conductor material. In some embodiments, the anode cross ties and the cathode cross ties each comprise conductive protrusions, which are located external to the battery.

A secondary battery includes an electrode body, a battery case, and an electrode terminal. The electrode body has a foil collecting portion. The electrode terminal corresponding to at least one of a positive electrode and a negative electrode is electrically connected to the foil collecting portion via a current collector terminal. The current collector terminal is joined to the foil collecting portion. The foil collecting portion has a joining mark composed of a plurality of recesses on a surface on an opposite side of the foil collecting portion from a surface joined to the current collector terminal. The joining mark has two corners on an inner side of the electrode body and two corners on an outer side of the electrode body, and only the two corners on the inner side of the electrode body have a chamfered shape.

A tab, a preparation method thereof, and a battery including the tab are disclosed. The tab is a copper foil material, a surface of the copper foil material having a large compressive stress is an S surface, a surface having a small compressive stress is an M surface, and only the M surface is provided with an indentation or a reinforcing rib. In the preparation method of the tab of the disclosure, the S surface/M surface of the copper foil material are identified, and it is ensured that a feed direction is oriented so that the M surface faces outward (or inward), and winding/unwinding directions of each process and a mounting direction of an embossing device are reasonably fixed, so as to ensure that a tab emboss pattern of a product is pressed on the M surface of the copper foil material rather than the S surface or both surfaces.

According to an embodiment, there are provided a method for manufacturing a battery module for an electric vehicle and a battery module manufactured by the method. The method comprises preparing an electrode assembly, the electrode assembly including a plurality of electrode plates, a plurality of electrode tabs, and a separator, forming a plurality of electrode leads by friction-welding a copper piece and an aluminum piece, attaching a sealing film to each of the plurality of electrode leads, packing the electrode assembly in a pouch case, with the aluminum piece exposed to an outside of the pouch case, injecting an electrolyte into the pouch case, sealing the pouch case to form each of the plurality of battery cells, stacking the plurality of battery cells one over another, and connecting the aluminum pieces of the plurality of battery cells to each other via a sensing bus bar.

According to an embodiment, there are provided a method for manufacturing a battery module for an electric vehicle and a battery module manufactured by the method. The method comprises preparing an electrode assembly, the electrode assembly including a plurality of electrode plates, a plurality of electrode tabs, and a separator, forming a plurality of electrode leads by friction-welding a copper piece and an aluminum piece, attaching a sealing film to each of the plurality of electrode leads, packing the electrode assembly in a pouch case, with the aluminum piece exposed to an outside of the pouch case, injecting an electrolyte into the pouch case, sealing the pouch case to form each of the plurality of battery cells, stacking the plurality of battery cells one over another, and connecting the aluminum pieces of the plurality of battery cells to each other via a sensing bus bar.

A battery cell includes: an electrode unit including a positive electrode, a negative electrode, a current collector, and a separator; a housing unit accommodating the electrode unit; a first insulator disposed inside the housing unit and between the electrode unit and the housing unit, an internal terminal disposed inside the housing unit and electrically connected to the current collector; a second insulator disposed inside the housing unit and between the internal terminal and the housing unit; and an external terminal disposed outside the housing unit. A contact surface of the first insulator with the electrode unit has indented shape. The first insulator is fixed to the housing unit.

An energy storage apparatus includes: two energy storage devices each including an electrode assembly formed by stacking in a stacking direction and a metal case in which the electrode assembly is accommodated, the two energy storage devices including a first energy storage device and a second energy storage device that are arrayed in an array direction intersecting the stacking direction; and a pair of restraint bodies that collectively sandwiches the first energy storage device and the second energy storage device in the stacking direction.

A secondary battery may include an electrode assembly formed by alternately stacking an electrode and a separator; a battery case; a plurality of electrode tabs, each of which protrudes from the electrode assembly; a plurality of electrode leads, each of which has one end connected to the electrode tab and the other end protruding outward; a piezoelectric element which is disposed to the outside of a cup portion of the battery case that accommodates the electrode assembly and which, when the battery case expands in volume, receives pressure and supplies electric power to the outside; and a short-circuit inducing part which has a wire shape and both ends respectively positioned on sealing portions of the battery case that seal the electrode leads, wherein, when the electric power is applied from the piezoelectric element, both the ends respectively extend toward the electrode leads and come into contact with the electrode leads.