Abstract: An electrochemical device includes a packaging shell having a first packaging body provided with a first dent and a first flange connected to a sidewall of the first dent, and a second packaging body provided with a second dent and a second flange connected to a sidewall of the second dent; a first electrode assembly disposed in the first dent; a second electrode assembly disposed in the second dent; and a partition plate including a partition layer and a first bonding layer located on a first surface of the partition layer. The partition plate is located between the first packaging body and the second packaging body. The flange overlaps the partition plate and extends beyond an edge of the partition plate. The partition plate fits with the first packaging body and the second packaging body to form mutually independent cavities on two sides of the partition plate.

Abstract: An electrochemical device, including a first housing, a second housing, and a first separation piece. The first separation piece is disposed between the first housing and the second housing. A first cavity and a second cavity are disposed on two sides of the first separation piece of the electrochemical device respectively. The first separation piece includes a first substrate layer and a first sealing material layer located on a surface of the first substrate layer. The electrochemical device satisfies: 1.2?Fs11/F11?15, where F11 is a peel force between the first sealing material layer and the first substrate layer, and Fs11 is a peel force between the first housing and the first sealing material layer. This arrangement can reduce the risk of bursting the seal interface when the electrochemical device is impacted such as dropped, thereby improving the safety and reliability of the electrochemical device.

Abstract: An electrochemical device, including a housing and N separators. The N separators and the housing together define N+1 accommodating cavities arranged along a first direction. The N+1 accommodating cavities include a first accommodating cavity and a second accommodating cavity adjacent to each other, wherein N?2. A first electrode assembly is accommodated in the first accommodating cavity, and a second electrode assembly is accommodated in the second accommodating cavity. The second electrode assembly is far from a reference surface relative to the first electrode assembly. The reference surface is a plane that passes through the 10 center of the electrochemical device along the first direction and is perpendicular to the first direction. The volume V1 of the first accommodating cavity and the volume V2 of the second accommodating cavity satisfy 0.5%?(V2?V1)/V1?5%, so that the safety performance of the electrochemical device is improved.

Abstract: An electrochemical apparatus, including: a first electrode assembly including a first negative electrode plate having a first negative current collector with a first negative active material layer disposed on at least one surface; and a second electrode assembly including a second negative electrode plate having a second negative current collector with a second negative active material layer disposed on at least one surface. A coating weight W1f of the first negative active material layer and a coating weight W2f of the second negative active material layer satisfy: 30 mg/1540.25 mm2?W2f?W1f?100 mg/1540.25 mm2. By regulating a value of W2f?W1f to be within the above range, energy density of the electrochemical apparatus and swelling performance of the electrochemical apparatus can be improved while fast charging performance is satisfied.

Abstract: A cylindrical battery, including: a housing, an electrode assembly, a first current collecting disc, and a protection piece. The housing contains a first end portion. The electrode assembly is accommodated in the housing. The first current collecting disc is electrically connected to the electrode assembly in the housing. The first end portion contains several welding track configured to be connected to the first current collecting disc. The first end portion further contains a first surface oriented away from the first current collecting disc. On the first surface, the welding track are arranged away from a center of the first surface. The protection piece is sheathed around the housing, extends beyond the first surface, and covers the welding track. No welding track is arranged at the center of the first surface.

Abstract: An electrochemical device and an electronic device containing the electrochemical device. With a first accommodation portion disposed in the electrochemical device, a specific accommodation space is provided for a bend portion of a first tab, thereby avoiding a need to additionally increasing space for accommodating the bend portion, where the space is originally intended for accommodating the electrode assembly. This effectively saves the space occupied by the tab in the packaging shell, reduces the size of the electrochemical device, and improves an energy density of the electrochemical device. The electronic device also achieves a high energy density.

Abstract: A battery pack, including a housing, a circuit board, and a plurality of electrode assemblies. The housing includes a first surface and a second surface opposite to each other. The first surface is provided with a plurality of first slots. The battery pack further includes a plurality of first caps, and the plurality of first caps respectively cover the plurality of first slots to form a plurality of mutually separated accommodation spaces. The electrode assemblies each includes an electrode plate assembly, a first electrode tab, and a second electrode tab. The electrode plate assembly is accommodated in the accommodating space. The first tab and the second tab extend out of the accommodating space. At least one first electrode tab and at least one second electrode tab are electrically connected to the circuit board. The structure and the manufacturing process of the battery pack can be simplified.

Abstract: An electrochemical device includes a packaging shell having a first packaging body provided with a first dent and a first flange connected to a sidewall of the first dent, and a second packaging body provided with a second dent and a second flange connected to a sidewall of the second dent; a first electrode assembly disposed in the first dent; a second electrode assembly disposed in the second dent; and a partition plate including a partition layer and a first bonding layer located on a first surface of the partition layer. The partition plate is located between the first packaging body and the second packaging body. The flange overlaps the partition plate and extends beyond an edge of the partition plate. The partition plate fits with the first packaging body and the second packaging body to form mutually independent cavities on two sides of the partition plate.