Abstract: Disclosed are an electrolyte and a battery electrolyte adapted to a lithium manganese iron phosphate positive electrode material. The electrolyte includes a non-aqueous solvent, a lithium salt, and a negative electrode film-forming additive. The mass ratio a of a total mass of the dimethyl carbonate and the carboxylate in the non-aqueous solvent, a molar ratio b of the lithium bis(fluorosulfonyl)imide in the lithium salt, the molar ratio y of a manganese element in the lithium manganese iron phosphate positive electrode material, and a compaction density c of a positive electrode sheet satisfy a formula I as follows: 0.1 ? a + b y × c < ¯ 3 ; 0.01?a?1; 0.01?b?1; 1.8?c?2.7 in a unit of g/cm3; a chemical formula of the lithium manganese iron phosphate positive electrode material is LixMnyFe1-yPO4, 0.95?x?1.05, 0.3?y?0.8; and a mass ratio d of the negative electrode film-forming additive in the electrolyte and the y satisfy a formula as follows: 3?(100×d)/y?20 and 0.001?d?0.2.

Abstract: 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.

Abstract: 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.

Abstract: 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/cm3, and C represents an injection coefficient of the electrolyte in g/Ah.

Abstract: 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.

Abstract: The present application provides an adapter piece structure, a battery cell structure and an assembly process therefor, as well as a battery for large-scale energy storage. The adapter piece structure includes a tab connecting portion and a terminal connecting portion, the tab connecting portion is configured to connect with a tab of a battery cell, and the terminal connecting portion is connected with the tab connecting portion. The terminal connecting portion has a first side, the first side has a clean area provided to be cleaned, and the clean area includes a welding area and an annular area arranged around a circumference of the welding area. The welding area is configured for welding the terminal connecting portion with a terminal of a cover plate.

Abstract: Provided are a core cell stack assembly and a stacking method therefor, and a battery. The core cell stack assembly includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet in a thickness direction of the core cell stack assembly. An edge of the separator is flush with an edge of the negative electrode sheet and extends beyond an edge of the positive electrode sheet on at least one end of each of the positive electrode sheet, the negative electrode sheet, and the separator.

Abstract: The present disclosure provides a cover plate assembly and a battery. The cover plate assembly is mounted on a shell with an accommodation cavity, and includes: a cover plate, provided with a first mounting hole in communication with the accommodation cavity; a collection component, located in the accommodation cavity and configured to acquire parameter information inside the shell; a lower connection part, of which a first end is located in the first mounting hole and a second end is communicatively connected with the collection component; and, an upper connection part, of which a first end is detachably communicatively connected with the first end of the lower connection part and a second end passes through the first mounting hole.

Abstract: The present disclosure provides a packaging device and a packaging method. The packaging device includes a conveying mechanism, a packaging mechanism and a guide mechanism. The conveying mechanism is configured to convey a battery in a first direction; the packaging mechanism comprises a driving assembly, two supports arranged at an interval and two pressing members arranged in parallel, and the supports are connected to the driving assembly; and the packaging mechanism is mounted on the guide mechanism.

Abstract: The present disclosure provides an electrode plate die-cutting method and an electrode plate die-cutting device. The electrode plate die-cutting method includes: conveying an electrode plate material strip in a first direction to a cutting area of an electrode plate die-cutting device; and adjusting, based on the electrode plate material strip, a position of each of a first laser cutting assembly and a second laser cutting assembly of the electrode plate die-cutting device to position a center point of a first laser galvanometer of the first laser cutting assembly above a predetermined electrode plate cutting line and to position a center point of a second laser galvanometer of the second laser cutting assembly above the tab cutting area.

Abstract: The present disclosure provides a bonding structure, a bonding method, an insulating adhesive tape, and a battery. The insulating adhesive tape includes a first bonding area and a second bonding area disposed at intervals, and a non-bonding area disposed between the first bonding area and the second bonding area. The first bonding area is configured to bond a cell, the second bonding area is configured to bond a welding area formed by a tab of the cell and a current collector, and the non-bonding area is configured to correspond to a bending area of the tab.

Abstract: The present application relates to a battery capable of monitoring an electrolyte and a battery pack. The battery capable of monitoring the electrolyte includes a housing, a cover plate and an acquisition module. The acquisition module includes a processing chip and an acquisition sensor electrically connected to the processing chip. The acquisition sensor is configured to acquire state data of the electrolyte in the battery capable of monitoring the electrolyte. The processing chip is disposed in the cover plate. The acquisition sensor is disposed in an accommodating cavity. A first end of the acquisition sensor is disposed in the electrolyte in the accommodating cavity. A distance between the first end of the acquisition sensor and a bottom plate of the housing is less than or equal to a first threshold.

Abstract: A battery and a battery pack are provided. The battery includes: a housing; and an explosion-proof valve, including a welding portion, the welding portion is welded to the housing, and the explosion-proof valve further includes a weakened portion. A buffer structure is arranged on the explosion-proof valve or the housing, the buffer structure is arranged close to the welding portion, and the buffer structure is configured to release the stress produced by the welding portion during welding.

Abstract: A laminated cell, a prismatic lithium battery and a battery pack are provided. The laminated cell includes a plurality of cell units stacked in sequence along a first direction, each of the cell units includes a positive electrode plate, a separator and a negative electrode plate that are stacked in sequence, and a separator is disposed between two adjacent ones of the cell units. A ratio of a length to a thickness of the positive electrode plate and a ratio of a length to a thickness of the negative electrode plate are respectively and independently selected from 6.3×102 to 9.4×102, and a ratio of a width to the thickness of the positive electrode plate and a ratio of a width to the thickness of the negative electrode plate are respectively and independently selected 6.3×102 to 9.4×102.

Abstract: An electrode tab connecting structure, a battery, and a welding detection system are provided in the present application. The electrode tab connecting structure includes a battery pin, and the battery pin includes an electrode terminal connecting portion and an electrode tab connecting portion. The electrode tab connecting portion includes a bent portion, a main body portion, and a connecting sub-portion. An outer side face, facing away from the main body portion and the connecting sub-portion, of the bent portion is arranged to be rounded. An outer circumference of a cross section of the bent portion is L1, a thickness of the main body portion is L2, L1=aL2, a is a first coefficient, and ??a<10.

Abstract: A drying device is provided and is configured to dry an electrode sheet. The drying device includes: a box body, a plurality of first infrared drying assemblies, and a plurality of second infrared drying assemblies. The box body defines a drying channel extending through the box body. The electrode sheet is capable of being conveyed in the drying channel; the drying channel has a first side and a second side opposite to the first side; the box body includes a first drying section arranged along a conveying direction of the electrode sheet. The plurality of first infrared drying assemblies are arranged on an inner wall of the first drying section and located on the first side of the drying channel. The plurality of second infrared drying assemblies are arranged on the inner wall of the first drying section and located on the second side of the drying channel.

Abstract: A positive electrode sheet, a method for preparing the same, and its application. The positive electrode sheet includes a positive electrode current collector and a composite positive electrode active material layer arranged on at least one side surface of the positive electrode current collector; the composite positive electrode active material layer includes a first positive electrode active material layer and a second positive electrode active material layer stacked in sequence, the second positive electrode active material layer is arranged on a side, away from the positive electrode current collector, of the first positive electrode active material layer; a material of the first positive electrode active material layer comprises a positive electrode material with a layered structure, and a first conductive agent; and a material of the second positive electrode active material layer comprises a positive electrode material with an olivine structure, a second conductive agent, and a pore forming agent.

Abstract: The present application discloses a fusing device and a power battery. The fusing device includes: a conductive sheet and an insulating connection component, wherein a clearance portion is arranged on the conductive sheet, and the conductive sheet defines a fusing portion at the clearance remaining position on at least one side of the clearance portion; and the insulating connection component is provided with a connection portion and a load bearing portion, the insulating connection component is connected to the conductive sheet through the connection portion, the load bearing portion is located below the fusing portion, and molten beads formed after the fusing portion is blown are enabled to fall into the load bearing portion.

Abstract: A preparation method of a thermally composited laminated cell and a thermally composited laminated cell are provided. The preparation method includes: preparing a plurality of first electrode plate groups and a plurality of second electrode plate groups, each of the first electrode plate groups includes a plurality of first units, each of the second electrode plate groups includes a plurality of second units. An outermost side of the first unit is provided with a negative electrode plate, and an outermost side of the second unit is provided with a positive electrode plate. Providing a first separator, and assembling the plurality of first electrode plate groups, the plurality of second electrode plate groups and the first separator to prepare a composite cell group. Cutting the composite cell group to prepare a plurality of thermally composited laminated cells.

Abstract: A thermal composite laminated cell and a battery cell are disclosed by this application. The thermal composite laminated battery cell includes a first cell unit, a second cell unit and a separator with a continuous layer structure, wherein the outermost sides of the first cell unit are negative electrode sheets, and the outermost sides of the second cell unit are positive electrode sheets. The separator with a continuous layer structure includes a plurality of main bodies and a plurality of bent portions all alternately and continuously disposed, the first cell units and the second cell units are alternately disposed in a thickness direction, and the adjacent first cell unit and the second cell unit are separated by the main body.