Zhuhai CosMX Battery Patente

Disclosed is a battery, which is a high-safety battery with excellent high-temperature performance at high voltage. High-temperature cycling performance of a prepared battery can be improved effectively by adjusting and controlling a ratio of an area of a positive electrode welding region to a content of a cyano compound and a ratio of the area of the positive electrode welding region to a width of a positive tab, so that a metal conductor and a tab tape of the tab are more resistant to high temperature and high voltage, and an adhesive layer is stabilized. In addition, liquid leakage can be prevented, and safety performance of battery cell under conditions such as dropping of an entire battery cell and high furnace temperature can be improved.

The present invention relates to the technical field of batteries, and in particular relates to a negative electrode plate and a battery. The negative electrode plate comprises a negative electrode current collector and a negative electrode active coating layer on a surface of at least one side of the negative electrode current collector, wherein the negative electrode active coating layer comprises silicon-based particles; the number of the silicon-based particles in a region of 100 µm x 100 µm of the surface of the negative electrode active coating layer is a, 1 ≤ a ≤ 50; the average sphericity of the silicon-based particles is b, 0.66 ≤ b ≤ 1; and a and b satisfy: 1 ≤ a/b ≤ 67, thereby the degree of self-discharge of the battery can be reduced and the high-temperature storage performance of the battery can be improved.

The present disclosure relates to the technical field of lithium batteries and provides a wound-type lithium-ion battery. In the wound-type lithium-ion battery, a plurality of recessed portions are provided on one side of the negative electrode current collector in the single-sided area of the negative electrode plate at the center of the jelly roll, where the negative electrode active layer is not provided. Additionally, the projections of the leading end of the first negative electrode active layer and the leading end of the second negative electrode active layer in different bending regions overlap in the thickness direction of the jelly roll. The combined effect of the recessed portions and the overlapping projections of the negative electrode active layers can significantly increase the liquid retention at the center of the jelly roll, improve the wettability of the electrolyte solution to the electrode plates, thereby enhancing the cycling performance of the battery and reducing lithium deposition.

A battery, comprising a case and a cell, wherein the case is provided with a pressure relief groove; the cell is arranged within the case and comprises a positive electrode plate, a negative electrode plate, and a separator located between the positive and negative electrode plates; the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer located on the negative electrode current collector, the negative electrode active material layer comprising a silicon-carbon composite material; and a ratio of the Dv50 of the silicon-carbon composite material to a depth of the pressure relief groove ranges from 0.06 to 0.6.

The present invention provides a battery, including: a housing (1) enclosed to form a chamber and including a first side plate (11) and a bottom side plate (16) connected with the first side plate (11); a cell (2) located in the chamber and provided with a first tab (21); and a first adapter (31) electrically connected with the first tab (21), where the first adapter (31) is disposed between the first side plate (11) and the cell (2), and a projection of the first adapter (31) on the first side plate (11) does not overlap with a projection of the first tab (21) on the first side plate (11); and where the battery further includes a first connector located between the cell (2) and the first side plate (11) and connected with the first tab (21) and the first adapter (31), respectively; and the first connector includes a first connection sheet (51) connected with the first adapter (31) and a fourth connection sheet (54) connected with a side of the first tab (21) facing away from the cell (2); and a side of the first connection sheet (51) facing away from the first adapter (31) is provided with a sixth insulation layer (86), and a projection of the sixth insulation layer (86) on the sixth side plate (16) overlaps with a projection of the first tab (21) on the sixth side plate (16). The present invention can improve the battery performance such as energy density.

The present disclosure provides a battery and an electronic device. The battery comprises a negative electrode plate (100), a positive electrode plate (200) and an electrolyte, wherein the negative electrode plate (100) comprises a negative electrode current collector (110) and a negative electrode active material layer (120) located on the surface of at least one side of the negative electrode current collector (110), the positive electrode plate (200) comprises a positive electrode current collector (210) and a positive electrode active material layer (220) located on the surface of at least one side of the positive electrode current collector (210), a tab groove (230) is provided on the positive electrode active material layer (220) with a positive tab (240) accommodated in the tab groove (230) and a tab adhesive layer (250) provided on the surface of the positive tab (240), a groove (130) is provided on the negative electrode active material layer (120), the tab groove (230) is arranged opposite the groove (130) in the third direction of the positive electrode plate (200), and an insulating adhesive layer (300) is provided in the groove (130), and the electrolyte comprises a fluorinated solvent, and the mass content percentage of the fluorinated solvent in the electrolyte is m1%, where 5% ≤ m1% ≤ 50%. The battery of the present disclosure can provide the preset groove in the negative electrode region with a certain corrosion resistance, such that the cycling life and safety performance of the battery can be improved.

The present disclosure provides a lithium-ion battery. In the lithium-ion battery of the present disclosure, the positive electrode plate comprises a first surface and a second surface arranged oppositely along its thickness direction. The first surface is provided with a plurality of first projections at intervals, and the second surface is correspondingly provided with a plurality of first recesses. The height of the first projection is denoted as H µm, and the diameter of the first projection is denoted as R mm, with H and R satisfying 0.2 ≤ H/R ≤ 80. The electrolyte comprises a carboxylic ester, with the mass percentage of the carboxylic ester relative to the total electrolyte mass denoted as A, which satisfies 10 ≤ A ≤ 80. When the above conditions are met, the battery's fast-charging performance and cycle stability can be improved.

A jelly roll includes a positive electrode plate, a negative electrode plate and a separator located between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a first surface and a second surface opposite to each other in a first direction, the positive electrode plate is provided with a plurality of protruding portions and straight portions located between the adjacent protruding portions. A maximum distance from a vertex of the protruding portion to a plane where the first surface is located is hl, in the first direction, a thickness of the straight portion on the positive electrode plate is h, and 5% ≤ h1/h ≤ 30%. The negative electrode plate includes a negative electrode active layer with a weight percentage content of a silicon element being W1, and 0.3≤ W1/(h1/h) ≤5.

A lithium-ion battery includes an electrolyte, a negative electrode plate and a positive electrode plate. The electrolyte includes a fluorinated solvent; and with a content of the fluorinated solvent being f wt% based on a total weight of the electrolyte, and a ratio of a width of the negative electrode plate to a width of the positive electrode plate being g, the lithium-ion battery satisfies a following relation: 2≤f/g≤30.

Disclosed is a lithium-ion battery. The lithium-ion battery comprises a cell and an electrolyte, wherein the cell comprises a positive electrode plate, a separator, and a negative electrode plate that are stacked, wherein the positive electrode plate body has a first surface and a second surface opposite to each other in a thickness direction, and the positive electrode plate has a plurality of protruding portions on the first surface and recessed portions corresponding to the protruding portions on the second surface; and the electrolyte comprises A wt % of a sulfur-containing additive, which comprises at least one of a sulfonate, a sulfate, and a sulfite, with the lithium-ion battery satisfying 0.3≤H/T≤6 and 0.1≤A≤6; where H is the height of the protruding portion, in µm; and T is the thickness of the separator, in µm. The lithium-ion battery has both good electrochemical performance and safety.

The present invention provides an electrode piece and a battery. The electrode piece includes a current collector and a functional layer arranged on a first surface of the current collector, a tab is further arranged in middle of the first surface, and the functional layer on the first surface has a first slope area near the tab and a first normal area away from the tab, and a thickness of the first slope area gradually decreases along a direction towards the tab. The present invention can improve performances of the battery, such as rate capacity, safety and the like.

The present disclosure relates to the technical field of batteries, and in particular to a negative electrode active material, and a negative electrode plate and a battery comprising the negative electrode active material. The negative electrode active material comprises silicon-carbon composite particles; the silicon-carbon composite particles have closed pores, and the volume fraction of the closed pores is 4%-50%; the silicon-carbon composite particles have a core-shell structure with a shell thickness of t, where 0 < t ≤ 10 nm; the silicon-carbon composite particles have a first region and a second region on cross section, the content of silicon element in the first region is c1, the content of silicon element in the second region is c2, and 0.15 ≤ c2/c1 ≤ 1.4; where the dimension of the perpendicular line to the tangent line at any point on the edge of the cross section is L on the cross section, and on the perpendicular line, a region 0.001L-0.1L away from the edge of the cross section constitutes the first region, and a region 0.1L-0.5L away from the edge of the cross section constitutes the second region. The battery of the present disclosure can have high energy density, initial Coulombic efficiency, rate performance and cycling stability at the same time.

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