Disclosed herein are battery systems for electric vehicles. A battery may include a plurality of electrochemical cells and an flexible circuit disposed above the electrochemical cells. The flexible circuit may be generally defined by a longitudinal and lateral axis. The flexible circuit may include a positive conductive path, a negative conductive path, at least one opening extending through the flexible circuit, at least one expandable positive interconnect capable of electrically connecting the positive path to a positive terminal of an electrochemical cell, and at least one expandable negative interconnect capable of electrically connecting the negative conductive path to a negative terminal of an electrochemical cell. The positive and negative interconnects may be expandable in at least the transverse direction and may extend from an edge of the at least one opening and terminate at a connection pad.

A method for producing a battery resulting from the joining with a plurality of weld nuggets therebetween of a foil layered part, at which foil exposed portions exposing an aluminum foil overlap, and a positive terminal member made of aluminum, includes: a formation step for forming at the foil layered part a foil welded part at which are formed, by welding aluminum foils together by means of ultrasonic welding, a first high-position part at at least a section of a surface to be joined, and a plurality of first low-position parts distributed at scattered points within the first high-position part; and a resistance-welding step for contacting the first high-position part to the positive terminal member, generating weld nuggets at the first low-position part by flowing an electric current, and resistance-welding the foil welded part and the positive terminal member with the weld nuggets therebetween.

A secondary battery including an electrode assembly, the electrode assembly including a first electrode, a second electrode, and a separator; a case accommodating the electrode assembly therein; a cell cover sealing the case; and a first terminal unit having one end that is electrically connected to the first electrode of the electrode assembly and having another end extracted to an outside of the case, wherein the first terminal unit includes a first collector in the case and electrically connected to the first electrode of the electrode assembly, the first collector having a fuse area; and an arc cutting block adjacent to the fuse area of the first collector, the arc cutting block being movable to a position previously occupied by the fuse area in the event that the fuse area is cut off, and cutting an arc generation path.

The secondary battery of the present invention includes: a top cover, a first electrode terminal, a second electrode terminal, an electrode-tab pad-plate, an electrode assembly, a first electrode-tab and a second electrode-tab; the first and second electrode terminal are arranged on the top cover, the electrode-tab pad-plate is a strip-plate shaped structure, and is located between the top cover and electrode assembly, the first electrode-tab includes a connecting part, a folding part and a welding part, the connecting part is located at upside of the electrode-tab pad-plate, the welding part is located at downside thereof, the connecting part is connected with the electrode assembly, the welding part is connected with the first electrode terminal, the folding part is connected with the connecting part and welding part bypassing the electrode-tab pad-plate; the second electrode terminal is connected with the electrode assembly through the second electrode-tab.

The present application relates to an electrode tab pad plate, the electrode tab pad plate is of a fork shape, including a joint part and two first fork feet, the two first fork feet are arranged in parallel, and a first gap is provided between the two first fork feet, both the first fork feet are connected with the joint part. The electrode tab pad plate provided by the present application, through gathering the electrode tabs at inner sides of the electrode tab pad plate, so that the electrode tabs are gathered toward the direction away from the battery housing, so as to guarantee the safety performance of the Li-ion battery, since the space occupied by the electrode tab pad plate is small, which facilitates the improvement of the cell capacity, thereby improving the performance of the battery.

A battery pack includes a thermally conductive plate that can be cooled or heated, and an array of electrochemical cells. The cells include a stacked or rolled arrangement of electrode plates, and a current collector disposed in the battery cell that forms an electrical connection with the electrode plates and provides a thermal conduction pathway for conducting heat from the electrode plates to the thermally conductive plate.

A method and a test fixture for evaluating a weld seam joining an electrode foil element and a terminal of a battery cell include segmenting the weld seam joining the electrode foil element and the terminal into a plurality of zones. For each of the zones, an electrical current is applied between the terminal and the electrode foil element in the zone, and a resistance is determined across the terminal and the electrode foil element in the zone. Integrity of the weld seam is evaluated for each of the zones based upon the resistance between the terminal and the electrode foil element in the zone.

According to one embodiment, there is provided a battery having a plurality of current collector tabs extended from a plurality of points of a current collector of at least one electrode of a positive electrode and a negative electrode. The battery further has a lid and a lead. The lead has a current collector tab junctional part connected with the current collector tabs, a lid junctional part fixed to the lid, and a vibration absorber part linking the current collector tab junctional part to the lid junctional part.

Described is an apparatus which comprises: a cathode current collector configured to be in direct contact to a first client terminal; an anode current collector configured to be in direct contact to a second client terminal; and at least two layers of active material, where one layer is adjacent to the cathode current collector and another layer is adjacent to the anode current collector.

In a method for manufacturing a connecting contact for an electrode of an electrochemical store, the electrode having a first material, a contact element made of a second material is provided, the contact element having a section coated using the first material, and the coated section is electrically and mechanically connected to the electrode to manufacture the connecting contact.