An electronic device includes a cell, a circuit board, and a cell protection unit. The circuit board is provided in the electronic device and configured to control the electronic device. The circuit board is electrically coupled to the cell, and the cell protection unit is provided on the circuit board. The cell protection unit is integrated with the circuit board, so as to facilitate heat dissipation of the cell, prolong the service life of the cell, speed up the production cycle of the cell, and reduce the production cost of the cell.

The purpose of the present disclosure is to provide a sealed battery that can expand a joint area of an electrode lead with respect to a sealing body or the like without using a large-width electrode lead. A sealed battery, which is an example of an embodiment, comprises: an electrode body having an electrode lead; a bottomed tubular exterior can that accommodates the electrode body; and a sealing body that plugs an opening section of the exterior can. The electrode lead is welded, with energy beams, to the inner surface of the sealing body. In addition, the electrode lead includes: a first main surface making contact with the inner surface of the sealing body; and a second main surface on the opposite side of the first main surface, wherein the first main surface and the second main surface are formed in no-parallel with each other.

The purpose of the present disclosure is to provide a sealed battery that can expand a joint area of an electrode lead with respect to a sealing body or the like without using a large-width electrode lead. A sealed battery, which is an example of an embodiment, comprises: an electrode body having an electrode lead; a bottomed tubular exterior can that accommodates the electrode body; and a sealing body that plugs an opening section of the exterior can. The electrode lead is welded, with energy beams, to the inner surface of the sealing body. In addition, the electrode lead includes: a first main surface making contact with the inner surface of the sealing body; and a second main surface on the opposite side of the first main surface, wherein the first main surface and the second main surface are formed in no-parallel with each other.

A welding method includes: irradiating a plurality of metal foils stacked on a first surface of a metal member in a first direction with laser light to weld the metal member and the plurality of metal foils to each other, the laser light including first laser light having a wavelength of 800 [nm] or more and 1200 [nm] or less and second laser light having a wavelength of 550 [nm] or less, a second surface of a metal foil farthest from the metal member in the first direction among the plurality of metal foils, on a side opposite to the metal member, being irradiated with the laser light.

A welding method includes: irradiating a plurality of metal foils stacked on a first surface of a metal member in a first direction with laser light to weld the metal member and the plurality of metal foils to each other, the laser light including first laser light having a wavelength of 800 [nm] or more and 1200 [nm] or less and second laser light having a wavelength of 550 [nm] or less, a second surface of a metal foil farthest from the metal member in the first direction among the plurality of metal foils, on a side opposite to the metal member, being irradiated with the laser light.

The embodiments of the present disclosure provide a secondary battery, a battery module, a battery pack, a device, and a manufacturing method. The secondary battery includes: an electrode unit, including a main body portion and a first tab and a second tab extending out from the main body portion; a casing, including an accommodating cavity for accommodating the main body portion and a first opening which is in communication with the accommodating cavity; a first cover plate capping the first opening, the first cover plate including a first relief hole penetrating therethrough, the first tab passes through the first relief hole and is connected to a side of the first cover plate facing away from the accommodating cavity; and a sealing plate, which is sealingly connected to the side of the first cover plate facing away from the accommodating cavity and covers the first relief hole.

A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly in which a separator is disposed between a first electrode and a second electrode; a case having an opening on one side and accommodating the electrode assembly; and a cap assembly coupled to the opening so as to seal the case. The cap assembly includes: a cap plate coupled to the opening and provided with a terminal hole; a terminal plate disposed inside the terminal hole; and an insulating material, and also includes a sealing portion which covers a circumferential portion on the terminal hole side of the cap plate and a circumferential portion of the terminal plate so as to form a seal between the cap plate and the terminal plate.

A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly in which a separator is disposed between a first electrode and a second electrode; a case having an opening on one side and accommodating the electrode assembly; and a cap assembly coupled to the opening so as to seal the case. The cap assembly includes: a cap plate coupled to the opening and provided with a terminal hole; a terminal plate disposed inside the terminal hole; and an insulating material, and also includes a sealing portion which covers a circumferential portion on the terminal hole side of the cap plate and a circumferential portion of the terminal plate so as to form a seal between the cap plate and the terminal plate.

Embodiments of this application provide a battery, an electric apparatus, and a method for preparing battery. The battery includes: a plurality of battery cells, where at least two of the battery cells are arranged along a first direction; a sampling part, configured to collect electrical signals from the plurality of battery cells; and a support part, configured to support the sampling part, where the support part is disposed between two adjacent battery cells in the first direction, and is attached to the battery cells. In the technical solution in the embodiments of this application, the sampling part is easy to install, and the sampling part can be prevented from falling off during use of the battery.

Embodiments of this application provide a battery, an electric apparatus, and a method for preparing battery. The battery includes: a plurality of battery cells, where at least two of the battery cells are arranged along a first direction; a sampling part, configured to collect electrical signals from the plurality of battery cells; and a support part, configured to support the sampling part, where the support part is disposed between two adjacent battery cells in the first direction, and is attached to the battery cells. In the technical solution in the embodiments of this application, the sampling part is easy to install, and the sampling part can be prevented from falling off during use of the battery.