A motor vehicle includes a traction battery module which has a hermetically sealed module housing in which at least one cell stack pair including a left-hand-side and a right-hand-side cell stack including, in each case, at least two battery cells is accommodated. The traction battery module is arranged in the vehicle floor and extends symmetrically in relation to the vehicle center (M) in the vehicle transverse direction (X). The traction battery module has a bottom wall in a horizontal plane. A gas space is formed in the module housing in the vehicle center (M) and between the left-hand-side cell stack and the right-hand-side cell stack with respect to the vehicle transverse direction (X). The module bottom wall has a degassing element centrally in the vehicle in the region of the gas space.

A motor vehicle includes a traction battery module which has a hermetically sealed module housing in which at least one cell stack pair including a left-hand-side and a right-hand-side cell stack including, in each case, at least two battery cells is accommodated. The traction battery module is arranged in the vehicle floor and extends symmetrically in relation to the vehicle center (M) in the vehicle transverse direction (X). The traction battery module has a bottom wall in a horizontal plane. A gas space is formed in the module housing in the vehicle center (M) and between the left-hand-side cell stack and the right-hand-side cell stack with respect to the vehicle transverse direction (X). The module bottom wall has a degassing element centrally in the vehicle in the region of the gas space.

An electrode structure, a bipolar all-solid secondary battery including the same, and a method of manufacturing the electrode structure are provided. The electrode structure includes: a current collector having a first surface and a second surface, wherein the first surface includes a first portion, a second portion, and an intermediate portion between the first portion and the second portion, the first portion and the second portion are arranged toward the outside in opposite directions to each other around the intermediate portion, and the second surface has an inward-folded structure; a cathode active material layer formed on the first portion of the first surface; an anode active material layer formed on the second portion of the first surface; and a compression pad arranged inside the inward-folded structure of the current collector.

A battery pack includes: a first battery cell; a circuit board electrically connected to the first battery cell and extending along a first axis, a first surface of the circuit board facing the first battery cell; a first connection tab protruding from the first surface of the circuit board toward the first battery cell along a second axis crossing the first axis; and a detection connection member connecting the first connection tab to the first battery cell.

A bipolar stack unit cell structure includes: a bicell in which a first anode current collector, a first anode active material layer, a first electrolyte layer, a first cathode active material layer, a cathode current collector, a second cathode active material layer, a second electrolyte layer, a second anode active material layer, and a second anode current collector are sequentially arranged, wherein a plurality of the bicells are stacked, and a compression pad is provided between the first anode current collector and the second anode current collector of adjacent bicells of the plurality of bicells. The bipolar stack unit cell structure absorbs a volume change of an anode and suppresses or reduces a volume change of the entire cell to obtain a stable (or suitable) lifespan, and the capacity and voltage thereof can be freely (or suitably) designed by bipolar connection of the unit cells.

A secondary battery includes: a first electrode provided with a first collector and a first electrode active material applied on at least one surface of the first collector; and a second electrode provided with a second collector and a second electrode active material applied on at least one surface of the second collector, wherein an uneven coating portion at which the first electrode active material irregularly increases in amount and is applied is provided on at least one of a coating start portion or a coating end portion of the first electrode active material, and an inactive coating portion configured to cover the uneven coating portion is provided on at least one of a coating start portion or a coating end portion of the second electrode active material. A method of manufacturing the secondary battery is also provided.

A hybrid series battery module includes a first-type battery cell including a first negative electrode plate and a second-type battery cell including a second negative electrode plate. Energy density of the first-type battery cell is less than energy density of the second-type battery cell. A first interlayer spacing of a negative electrode active material of the first negative electrode plate is greater than a second interlayer spacing of a negative electrode active material of the second negative electrode plate. In a state of charge of 0%, a ratio of the first interlayer spacing to the second interlayer spacing falls within a range of greater than or equal to 1.005 and less than or equal to 1.600.

A hybrid series battery module includes a first-type battery cell including a first negative electrode plate and a second-type battery cell including a second negative electrode plate. Energy density of the first-type battery cell is less than energy density of the second-type battery cell. A first interlayer spacing of a negative electrode active material of the first negative electrode plate is greater than a second interlayer spacing of a negative electrode active material of the second negative electrode plate. In a state of charge of 0%, a ratio of the first interlayer spacing to the second interlayer spacing falls within a range of greater than or equal to 1.005 and less than or equal to 1.600.

An electrochemical device includes a packaging bag, an electrode assembly, and a binder. The electrode assembly is disposed in the packaging bag. The binder is configured to bond the electrode assembly to the packaging bag. The binder includes a first bonding layer, a substrate layer, and a second bonding layer that are stacked in sequence. The first bonding layer adheres to a surface of the electrode assembly. The second bonding layer adheres to a surface that is of the packaging bag and that is close to the electrode assembly. A peel strength between the first bonding layer and the electrode assembly is F.sub.1, a peel strength between the second bonding layer and the packaging bag is F.sub.2, and the peel strengths satisfy 50 N/m≤F.sub.1≤1000 N/m and 1≤F.sub.1/F.sub.2≤10. A tensile strength of the substrate layer is 100 MPa to 2000 MPa.

A cylindrical secondary battery of one embodiment of the present disclosure comprises: an electrode body in which a positive electrode and a negative electrode are wound with a separator therebetween; an electrolytic solution; and a cylindrical housing that accommodates the electrode body and the electrolytic solution. A plurality of linear insulators extend in the short-direction of the separator and are disposed between the separator and at least one of the positive electrode and the negative electrode. The insulators do not overlap each other in the radial direction of the electrode body.