EVE POWER CO., LTD.

This application provides a battery cell, which relates to the technical field of battery cells. The battery cell includes a housing, wherein an explosion-proof structure is provided on the housing; a valve opening area S of the explosion-proof structure, a valve opening pressure P of the explosion-proof structure, an electrolyte injection amount m of the battery cell, and a capacity C of the battery cell satisfy 2.4≤S×P−C/(m×1000)≤5.4.

The present disclosure provides a battery and an electrical device. The battery includes a connection member and a package member, where the connection member has an electrode lead-out portion for connecting an electrode of the battery and a tab connection portion for connecting a tab of the battery; and where at least a partial structure of the package portion is provided at the connection between the electrode lead-out portion and the tab connection portion and/or the connection between the electrode lead-out portion and an electrode of the battery. The battery of the present disclosure improves the connection stability of between the tab of the battery and the electrode of the battery.

A core, a battery, and a battery pack are provided. The core includes: an electrode sheet assembly including a plurality of electrode sheets each including a tab; where a plurality of tabs are welded to form a weld imprint area, a height of the tabs after folded is H1, and the height of the weld imprint area is H2; and where the core further has two side surfaces opposite to each other in a thickness direction of the core, a distance between the weld imprint area and one of the side surfaces is D, and a thickness of the core is d; and where 0.42≤arctan((H1−H2)/(d−D))/arctan((H1−H2)/D)≤1.

A positive electrode active material, a method for preparing the same, a positive electrode plate, and a battery are provided. The positive electrode active material includes a ternary material and lithium manganese iron phosphate. A mass of the lithium manganese iron phosphate is represented by A, a total mass of the ternary material and the lithium manganese iron phosphate is represented by B, where A and B satisfy: 0<A/B<50%. The lithium manganese iron phosphate has a hollow spherical structure and has a median particle size ranging from 0.5 μm to 3 μm.

A conductive adhesive and a preparation method thereof, a negative electrode sheet and a battery are provided herein. The conductive adhesive has a structural formula represented by formula (1), where m:n=(1-4):1.

A battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The battery satisfies: 1.5 ⩽ V × PD C ⩽ 3.6 , and where V represents a viscosity of the electrolyte in mPa·s, PD represents a compaction density of the positive electrode sheet in g/cm 3 , and C represents an injection coefficient of the electrolyte in g/Ah.

A conductive structure, a cover plate assembly, and a battery cell are provided. The conductive structure includes a first limiting portion and a second limiting portion disposed on one side of the first limiting portion. The second limiting portion includes a bendable and deformable annular rib. A free end of the annular rib is partially recessed inward to form a first groove. In a use state, the conductive structure is configured to pass through a cover plate and be connected to the tab, and at least the free end of the annular rib is turned outward to form a first flange. The first flange and the first limiting portion both abut against the cover plate and jointly clamp the cover plate.

A core pack assembly, a battery, a battery pack, and a vehicle are provided. The core pack assembly includes a core pack and one or more wicking components. The core pack is provided with tabs, and each wicking component is arranged on an outer surface of the core pack and located on a same side of the core pack as the tabs, and is configured to absorb electrolyte outside the core pack and transfer the electrolyte into the core pack.

The present disclosure provides a lithium-ion battery and an electrical device. The lithium-ion battery includes a positive electrode sheet and an electrolyte. Active material in the positive electrode sheet includes a lithium phosphate positive electrode material and a lithium cobalt nickel manganese oxide. The electrolyte includes a positive electrode film forming agent, a negative electrode film forming agent, and a lithium salt. The lithium salt includes lithium hexafluorophosphate and lithium bisfluorosulfonylimide. The lithium-ion battery satisfies a formula as follows: 0.1 ≤ NL × S alt A dd ≤ 0 . 5 ⁢ 9 , wherein NL is a mass ratio of the lithium cobalt nickel manganese oxide to the lithium phosphate positive electrode material, S alt is a value of a sum of molar concentrations of the lithium hexafluorophosphate and the lithium bisfluorosulfonylimide in the electrolyte in mol/L, and A dd is a mass ratio of the positive electrode film forming agent to the negative electrode film forming agent.

A heat spreader includes a first plate, a second plate and a plurality of protrusions. The first plate is configured to fit against at least one side surface of a cell. The second plate is hermetically connected to the first plate to form an enclosed space filled with a liquid medium. The protrusions are disposed between the first plate and the second plate and dispersedly arranged in the enclosed space. Some of the protrusions are arranged at intervals in a first direction to form a protrusion group, and two parts of the protrusions respectively belonging to two adjacent protrusion groups are at least partially staggered in a second direction different from the first direction.