JIANGSU ZENERGY BATTERY TECHNOLOGIES CO., LTD.

A cell and an assembly method thereof. The cell has an elongated structure with a positive electrode end and a negative electrode end. The negative electrode end is provided with a liquid injection hole, a tab protector and a single-cell collection board. A negative electrode column is connected to a negative tab on a cell core set through an aluminum plate, which is bendable to be accommodated into an accommodating cavity. The liquid injection hole is sunk into an avoidance hole on a top frame plate of the tab protector to clamp the tab protector. The electrolyte flows through the accommodating cavity to fill a core cavity, and the liquid injection hole is sealed by a sealing mechanism including a steel ball welded in the liquid injection hole and a structural adhesive filled in the recess.

Disclosed is a preparation method for modified polypropylene, comprising the following steps: dissolving polypropylene in a solvent; and adding a Lewis acid and an initiator into the solution in which the polypropylene is dissolved, and then performing a grafting reaction, to obtain the modified polypropylene; wherein the Lewis acid is selected from at least one of boron trifluoride diethyl etherate, boron trifluoride methyl ether, boron trifluoride acetic acid and boron trifluoride propionic acid; and the initiator is an organic peroxide initiator. Further disclosed are modified polypropylene prepared by the described method, a separator and a preparation method therefor, and a lithium-sulfur battery. Lewis acid monomers are grafted onto molecules of the modified polypropylene provided in the present disclosure, and therefore the modified polypropylene is suitable for being prepared into a separator of a lithium-sulfur battery, and can improve the electrochemical performance of the lithium-sulfur battery.

The disclosure provides a power battery top cover, a battery and an electrical device. The power battery top cover includes: a top cover plate, and a first electrode terminal assembly and a second electrode terminal assembly are mounted on the top cover plate; the first electrode terminal assembly includes an electrode member and a connecting piece, wherein the electrode member is formed by protruding upward from the top cover plate; and the connecting piece includes a body portion and a connecting portion, the connecting portion is provided at an end portion of the body portion, a recess is provided at the bottom of the top cover plate, and at least a part of the connecting portion is embedded in the recess. In the disclosure, the insulation fitting and the air-tightness fitting are omitted, thereby facilitating reduction of the production cost of the top cover.

The present disclosure discloses a cathode plate and a lithium ion battery, and relates to the field of battery technologies. The cathode plate includes a cathode current collector and a cathode active material layer provided on the cathode current collector, wherein the compact density of the cathode active material layer is a g/cm 3 , where 2.9≤a≤3.5; the areal density of the cathode active material layer is b g/cm 2 , where 0.012≤b≤0.018; and the mass percentage of the conductive agent in the cathode active material layer is c, where 2.4%≤c≤4.4%, and the cathode active material layer satisfies the formula below: 3.3<a 2 ×b/c<5.5. The lithium ion battery prepared from the cathode plate can achieve excellent Direct Current Resistance (DCR) performance while ensuring the energy density of the battery cell.

The disclosure relates to the field of battery technology, and provides a cell, a battery and an electric device. At least one end of the cell is provided with a tab group. The tab group includes a plurality of layers of tabs arranged sequentially outward from the center of the cell, and each layer of the plurality of layers of tabs surround the center of the cell. Each layer of the plurality of layers of tabs includes a plurality of sub-tabs, a slit is provided between two adjacent sub-tabs in each layer of the plurality of layers of tabs, and the slits in two adjacent layers of the plurality of layers of tabs are misaligned, which is conducive to the flattening of the tabs and makes the tabs less likely to wrinkle, and in turn will not easily lead to poor welding between the tabs and the connecting member.

The present disclosure belongs to the technical field of secondary batteries, and in particular, to a secondary battery and an electric device. The secondary battery includes a cell and a connecting member; the cell includes a cell body, a first tab led out along one end of the cell body, and a second tab led out along the other end of the cell body; and the connecting member is sleeved on the first tab and/or the second tab. The secondary battery of the present disclosure is provided with a connecting member, the connecting member is provided with a side surface welding portion, the side surface welding portion is attached to a side edge of the first tab and/or the second tab; and since the welding direction is a horizontal direction, a cell in a vertical direction is avoided, thereby preventing a failure of the cell.

Disclosed are a composite electrode terminal, a top cover and a battery, which relate to the technical field of batteries; the composite electrode terminal includes an inner electrode terminal and an outer electrode terminal; the inner electrode terminal is provided with a first fitting portion; the outer electrode terminal is provided with a second fitting portion fitting with the first fitting portion; one of the first fitting portion and the second fitting portion is a recessed groove, and the other of the first fitting portion and the second fitting portion is a protrusion; and when the first fitting portion is fitted with the second fitting portion, the circumferential edge of the protrusion is fitted with the circumferential edge of the inner wall of the recessed groove, and the end face of the protrusion is attached to the bottom of the recessed groove.

Disclosed are an electrode plate and a battery having the same. The electrode plate includes a current collector, a first coating and a second coating, the first coating is coated on at least one surface of the current collector, the second coating is coated on a surface of the first coating away from the current collector, and an Ol value of the second coating is less than an Ol value of the first coating. Compared with the related art, the electrode plate of the disclosure divides a thick coating layer into the first coating and the second coating for separate coating in order to ensure an energy density of the battery, and then the Ol value of the second coating is set to be less than that of the first coating. Therefore, an entire Ol value of the electrode plate is low.

The present invention discloses an electrode plate, a manufacturing method therefor and a battery. The manufacturing method for an electrode plate comprises: obtaining at least two active material films; stacking the at least two active material films, the fiberization directions of the two adjacent active material films being perpendicular to each other or forming an included angle, and applying a conductive glue between two adjacent active material films; rolling the stacked at least two active material films to obtain an electrode film; and combining the electrode film with a current collector to obtain the electrode plate. The manufacturing method of the present disclosure can improve the strength of the electrode film, and thus the electrode film is not prone to cracking. The included angle is formed between the fiberization directions of the two adjacent active material films, so that the electrode plate is prone to cracking are solved.

Disclosed are an electrolyte additive and a preparation method therefor, an electrolyte and a lithium ion battery. The preparation method for an electrolyte additive comprises: dissolving a picric acid in an organic solvent to obtain an additive solution, the organic solvent comprising at least one element of B, F and N; and performing crystallization from the additive solution, to precipitate an electrolyte additive. The electrolyte additive helps to make a polymer layer and an SEI film more rigid and stable, and helps to suppress the growth of lithium dendrites. The electrolyte added with the electrolyte additive can reduce the resistance of a lithium ion battery, and further improving the cycle performance of the lithium ion battery. The lithium ion battery provided in the present disclosure comprises the electrolyte added with the electrolyte additive, and therefore has a lower resistance and better cycle performance.