AESC

A positive electrode sheet, methods for designing and evaluating performance of the same, an electrode assembly, and a secondary battery belonging to the technical field of power batteries are provided. The positive electrode sheet includes a positive current collector and a positive active material layer on at least one side of the positive current collector. The positive active material layer satisfies the following relational expression: 0.97(FD+D<v50>2 *LT*µ<1/2>/20)≤PD≤FD+D<v50>2 *LT*µ<1/2>/20. A new feasible solution for designing a positive electrode sheet is provided. The rationality of positive electrode sheet design and material utilization are improved, a reliable supporting solution for material selection is provided, resources required for electrode sheet verification is saved, and development efficiency is enhanced. The solution is suitable for application in actual processing and design of a secondary battery.

A secondary battery (500) and an electronic device (400) are provided. The secondary battery (500) includes a housing (600), an electrode assembly (700), and a current-collecting plate (902). The housing (600) includes an end wall configured with an explosion-proof valve (904). The electrode assembly (700) is accommodated within the housing (600), with a tab (716) extending from an end of the electrode assembly (700) facing the explosion-proof valve (904). The current-collecting plate (902) is welded to the tab (716) and includes a first opening (102) passing through the center thereof and multiple second openings (104). The first opening (102) extends in a radial direction of the current-collecting plate (902). The second openings (104) are distributed on both sides of the first opening (102). A portion between end portions of the second openings (104) close to the first opening (102) and the first opening (102) constitutes a tearable portion (108).

Provided are a negative electrode material and a preparation method thereof and a lithium ion battery, specifically relating to the technical field of lithium ion batteries. The Young's modulus E of the negative electrode material has a value of: 8GPa≤E≤17Gpa, the negative electrode material includes natural graphite and a coating layer coated on the surface of the natural graphite. The negative electrode material of the disclosure has a relatively high Young's modulus, may better maintain the microscopic crystal structure when lithium ions deintercalate, undergoes smaller irreversible deformation, and has better cycle performance.

A secondary battery (100) and a battery pack (1002) are provided. The secondary battery (100) includes: an outer shell including a housing (110) and a cover plate (140) covering an opening (113) formed at an end of housing (110); an electrode assembly (130) accommodated in the outer shell and including a first electrode sheet, a separator (132), and a second electrode sheet, the first electrode sheet has a first electrode tab (300) facing the cover plate (140); a current collector plate (150) disposed between the cover plate (140) and the electrode assembly (130), and including a main body (152) welded to the first electrode tab (300) and a weld block (154) welded to the cover plate (140), a thermal conductivity coefficient of the weld block (154) is W1, a thermal conductivity coefficient of the main body (152) is W2, and W2 is greater than W1.

A battery cell (1), a battery pack (100), and an electronic device (1000) are provided. The battery cell (1) includes: a housing (10), including an end wall (11) and a side wall (12) surrounding the end wall (11), wherein the end wall (11) and the side wall (12) are enclosed to form an accommodating cavity (13); an electrode assembly (20), located in the accommodating cavity (13), wherein the electrode assembly (20) includes a positive electrode sheet (21), a separator (22), and a negative electrode sheet (23) stacked and wound to form a wound structure (201), the wound structure (201) includes a first end provided with a positive electrode tab (211) and a second end provided with a negative electrode tab along a height direction (H); and a first insulation film (40), encircling around an outer periphery of the wound structure (201) close to the first end.

Provided are a negative electrode material and a preparation method thereof and a lithium ion battery. The negative electrode material includes natural graphite and a coating layer coated on the surface of the natural graphite, and the compression index K of the negative electrode material is: 30≤K≤80; in which the compression index K=100(V₀-V_F)/V₀, where V₀ is the apparent volume per unit mass in a loose state, and V_F is the tapped volume per unit mass. The negative electrode material of an embodiment has suitable powder fluidity, reduced functional groups on the surface of negative electrode material particles, is easy to disperse during processing, and at the same time, fewer functional groups on the surface reduce side reactions during high temperature storage, thereby improving the high temperature storage performance of the negative electrode material.

A lithium manganese iron phosphate composite positive electrode material, a method of preparing the same, a positive electrode sheet, and a secondary battery belonging to the technical field of battery active materials are provided. The lithium manganese iron phosphate composite positive electrode material includes a component A and a component B. The component A is a Ni/Ti co-doped lithium manganese iron phosphate material, and a chemical formula of the Ni/Ti co-doped lithium manganese iron phosphate material is LiMn_0.6(1-x-y)Fe_0.4(1-x-y)Ni_xTi_yPO₄, where 0≤x≤0.05 and 0≤y≤0.05. The component B includes amorphous carbon. The Ni+Ti co-doping strategy effectively addresses the problems such as energy density and capacity decay of the lithium manganese iron phosphate positive electrode material, so lithium manganese iron phosphate is enabled to better exert its advantages of high energy density, enhanced safety, and low costs, and the capacity and cycle stability of the lithium manganese iron phosphate battery are thus improved.

A battery cell (100), a battery pack (700), and an electronic device (800) are provided. The battery cell (100) includes a housing (1), an electrode assembly (2), and a current collecting plate (3). A first extension portion (31) of the current collecting plate (3) extends from a main body portion (30) along a radial direction of the main body portion (30) to be in contact with an outer tab (21). A second extension portion (32) is connected to the main body portion (30) between the two adjacent first extension portions (31). The second extension portion (32) is formed with an outer edge surface along a circumferential direction. The outer edge surface is projected orthographically onto a plane where the outer tab (21) is located to form an outer edge surface projection (9032) at least partially overlapping each outer tab (21) between the two adjacent first extension portions (31).

A high-voltage box and an energy storage container are provided. The high-voltage box includes: multiple electrical components (100); multiple conductive components (200), each having a first panel surface (210) including a first region (211) and a second panel surface (220) disposed opposite to each other along a first direction; multiple semiconductor cooling components (300), each including a cooling end (310) for absorbing heat. Each conductive component (200) is electrically connected with the corresponding electrical component (100) through the first region (211). The cooling ends (310) are thermally connected with the conductive components (200) through the second panel surfaces (220). Along the first direction, an orthogonal projection of each cooling end (310) on the corresponding first panel surface (210) at least partially overlaps with of the first region (211).

A fiberizing equipment and a dry film forming equipment are provided. The fiberizing equipment includes a fiberizing mechanism (100), an infeed mechanism (200) and a cutting screening mechanism (300). The fiberizing mechanism (100) includes two fiberizing rollers (101) disposed opposite to each other. An infeed gap (102) is formed between the two fiberizing rollers (101). The infeed gap (102) includes an infeed port (1021) and an outfeed port (1022). The infeed mechanism (200) is located above the infeed port (1021). The cutting screening mechanism (300) is located below the outfeed port (1022) and includes a stock bin (301), a shredding component (302), and a screen (303). The screen (303) is located below the shredding component (302).