Abstract: A manufacturing method of a multilayer collector is provided, comprising preparing a resin layer, and a laminate in which collectors including a first metal layer and a second metal layer arranged on both sides of the resin layer are laminated, arranging a tab on one of an upper surface side and a lower surface side of the laminate, and a Sub-tab on another, performing heat compression on a portion to be welded of the tab, the laminate, and the Sub-tab in a laminating direction, to elute resin of the resin layer in the portion to be welded, and performing resistance welding on the portion to be welded.

Abstract: An active material used in a secondary battery includes a heterocyclic chemical compound including one or more pyrazine rings and two or more benzene rings, or a salt or derivative thereof. The heterocyclic chemical compound is preferably a chemical compound in which at least 4 oxygen atoms are bonded to the benzene ring. The active material used in the secondary battery may also include phenazine or a salt or derivative thereof. The phenazines are preferably chemical compounds in which at least 4 oxygen atoms are bonded to a benzene ring included in a phenazine structure.

Abstract: A negative electrode material that is used for a negative electrode of a lithium secondary battery containing a non-aqueous electrolyte solution, includes: a first layer that contains lithium metal as a negative electrode active material; and a second layer that is arranged on at least one surface of the first layer. The second layer consists of a compound represented by a general formula MxAy (M is an element selected from a group consisting of Al, In, Mg, Ag, Si, and Sn, and A is an element selected from a group consisting of O, N, P, and F, and 0.3<x/y<3). The second layer has a thickness of 100 nm or less.

Abstract: Provided is a system including: a management unit configured to manage a plurality of battery packs connected in parallel, in which the management unit is configured to control the plurality of battery packs to cause the plurality of battery packs to be discharged alternately so that a discharge rate of each of the plurality of battery packs becomes higher than the discharge rate in a case of discharging all of the plurality of battery packs. The plurality of battery packs include a plurality of left-hand side battery packs and a plurality of right-hand side battery packs, and the management unit is configured to manage the plurality of battery packs to cause at least one of the plurality of battery packs in each of the plurality of left-hand side battery packs and the plurality of right-hand side battery packs to be discharged at a time in order.