AESC

A lid assembly (10) and a lithium-ion battery is provided. The lid assembly (10) includes a lid base (1), a lower insulating member (4) stacked with the lid base (1), and a terminal (5) and an explosion protection valve (6) disposed on the lid base (1). The terminal (5) penetrates the lower insulating member (4) and the lid base (1). A first protruding portion (11) corresponding to a position of the explosion protection valve (6) and a second protruding portion (7) are provided on the lower insulating member (4). The second protruding portion (7) includes a planar region (7-1) and a curved region (7-2). A minimum dimension of an orthogonal projection of the curved region (7-2) on the lid base (1) in a length direction is L1. A minimum distance between the planar region (7-1) and the terminal base plate (5-1) on the terminal (5) is L0, which satisfies 0.5≤L1/L0≤0.9.

Disclosed are a lower casing and a battery pack. The lower casing includes: a base plate (1); a cold plate (2) provided with a stamped portion (201) and a peripheral connecting portion (202), the stamped portion is recessed in a direction away from the base plate, and encloses to form a heat-exchange channel (203) together with the base plate, the peripheral connecting portion surrounds the stamped portion, and the peripheral connecting portion is welded to the base plate; and a first port (3) and a second port (4), the first port and the second port are both fixedly connected to the base plate, and one of the first port and the second port is in communication with an inlet end of the heat-exchange channel, and the other of the first port and the second port is in communication with an outlet end of the heat-exchange channel.

The invention provides a sulfide solid electrolyte and a preparation method and an application thereof. A molecular formula of the sulfide solid electrolyte is Li_aP_1-bM_bS_cO_dX_e; wherein: 5<a<10; 0<b<1, 3<c<6, 0<d<2.5, 4<c+d<6, 0<e<2; M is selected from one or a plurality of Al, Ga, In, Ti, Sc, As, Sb, Bi, V, Nb, Ca, Mg, Sr, Ba, Zn, Cr, Sn, or Pb, and X is selected from one or a plurality of Cl, Br, or I. In an X-ray diffraction pattern obtained by CuKα radiation of a sulfide solid electrolyte powder, no diffraction peaks appear in ranges of 27° to 27.3°, 29° to 29.5°, and 35° to 35.2°. The invention provides a sulfide solid electrolyte and a preparation method and an application thereof that may obtain a high-purity doped sulfide solid electrolyte, suppress the formation of impurity phases, and improve the energy efficiency and cycle performance of the lithium-ion battery.

The disclosure provides an electrode sheet (300), including: an electrode sheet body (310), and a tab (320) protruding from the electrode sheet body (310) along a first direction (F), the tab (320) is set with a reinforcing rib array (321), the reinforcing rib array (321) includes multiple first reinforcing ribs (322); wherein in the first direction (F), every two adjoining first reinforcing ribs (322) are separated from each other. The purpose of the disclosure lies in providing an electrode sheet (300), a secondary battery (100A/B) and an electronic device (1000), so as to at least strengthen the supporting force for the tab (320).

Disclosed are a secondary battery (100), a battery pack (1002), and an electronic device (1000). The secondary battery (100) includes: a housing (200), including an end wall (111) and a side wall (109) surrounding the end wall (111), the end wall (111) having an opening portion (111V); an electrode assembly (120), including positive and negative electrode sheets (10, 20) and a separator (122); an electrode terminal (160), passing through the opening portion (111V) and fixed on the end wall (111); and a current collecting plate (202), disposed between the electrode assembly (120) and the end wall (111) and electrically connecting the electrode assembly (120) and the electrode terminal (160). Along a radial direction of the electrode assembly (120), the electrode assembly (120) includes a first region (Ra) and a second region (Rb). A minimum distance between a surface of the current collecting plate (202) facing the electrode assembly (120) and a first end (16u) of a negative electrode active material layer (16) along a first direction (D1) is L_A mm, L_A mm ≥1.5 mm.

Provided are a separator (100) and an electrochemical device. The separator (100) includes a porous base film (101) and a heat resistant layer (102). The heat resistant layer (102) is disposed on at least one surface of the porous base film (101), and includes inorganic particles and an adhesive agent. A surface static friction coefficient of the heat resistant layer (102) is ≤0.8, and a bulk density A of the heat resistant layer (102) satisfies: A=(0.4 to 0.5)×ρ. A heat resistant layer (102) with dense stacking and flat surface is obtained by controlling the static friction coefficient and bulk density of the heat resistant layer (102), which may increase an effective contact area between the adhesive particles in the heat resistant layer (102) and the electrode sheet, thereby increasing the adhesive force between the separator (100) as a whole and the electrode sheet.

An electrode sheet (100, 100A, 100B), a secondary battery (500), and an electronic device (1000) are provided. The electrode sheet (100, 100A, 100B) includes: an electrode sheet body (160); and an electrode tab (150, 150') extending from the electrode sheet body (160) in a first direction (D1), where a stiffener (190) is disposed on a surface of the electrode tab (150, 150'), where the stiffener (190) at least includes a first portion (192) and a second portion (194), the first portion (192) and the second portion (194) are connected through a bending part (196). An angle formed by the first portion (192) and the second portion (194) is a, 28°≤a≤45°.

An electrode sheet (100) includes a current collector (10) including a current collector body (12) and a tab (14) extending from the current collector body (12) along a first direction (d); an active material layer (20) disposed on at least one side of the current collector (10) in a thickness direction; and a reinforcement rib (30). The tab (14) has a tab bare foil region (40) where the active material layer (20) is not disposed. In the first direction (d), the reinforcement rib (30) continuously extends from the tab bare foil region (40) to a surface of the active material layer (20). The disclosure provides an electrode sheet (100) and a secondary battery (1300) to at least achieve avoiding tab folding.

An electrode sheet (100), a secondary battery (500), and an electronic device (1000) are provided. The electrode sheet (100) includes: an electrode sheet body (160), including a current collector (110) and an active material layer (130), the current collector (110) has two opposite surfaces, and the two surfaces are respectively coated with active material layers (130); and a tab (150), extending from the electrode sheet body (160), the tab (150) is provided with a second stiffener region (192) and a first stiffener region (191), the second stiffener region (192) is disposed between the first stiffener region (191) and the active material layer (130), a stiffener (190) is disposed in the first stiffener region (191) and the second stiffener region (192), a depth (H1) of the stiffener (190) in the first stiffener region (191) is greater than a depth (H2) of the stiffener (190) in the second stiffener region (192).

Disclosed are a separator (100) and an electrochemical device, specifically relating to the battery technology field. The separator (100) includes a porous base film (101), a heat-resistant layer (102) and an adhesive layer (103), wherein the heat-resistant layer (102) is disposed on at least one surface of the porous base film (101). The adhesive layer (103) is at least disposed on a surface of the heat-resistant layer (102) opposite to a surface in contact with the porous base film (101). An effective adhesion degree R-value of the separator (100) on a side where the heat-resistant layer (102) is provided is 40%-80%, and a difference between a maximum value and a minimum value of the effective adhesion degree R-value is <30%; wherein the effective adhesion degree R-value indicates a ratio of an effective adhesion area to a theoretical adhesion area of the separator (100).