AESC Patente

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 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 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 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).

A secondary battery (100), a battery pack (10), and an electronic device (1) are provided. The secondary battery (100) includes an electrode assembly (120), a shell (110), and a current collecting component (130). The shell (110) accommodates the electrode assembly (120), and a side of the shell (110) close to an opening (113) includes a rolling groove (114). The current collecting component (130) is disposed between the rolling groove (114) and the electrode assembly (120) and includes a current collecting body (131) connected to the electrode assembly (120) and a connecting sheet (132) bending toward the current collecting body (131) and welded to the rolling groove (114), thereby forming a first welding mark (1325). The connecting sheet (132) includes a bending portion (1322) provided with a first weak portion (1323) which is located between the first welding mark (1325) and the current collecting body (131).

A secondary battery (1), a battery pack (100), and an electronic device (1000) are provided. The secondary battery (1) includes a housing (10, 30); an electrode assembly (20) accommodated in the housing (10, 30), in which the electrode assembly (20) is formed by stacking a first electrode (21), a separator (22), and a second electrode (23); the first electrode (21) includes a first current collector (211), and a partial area of at least one surface of the first current collector (211) is covered with a conductive layer (212) and an insulation layer (213) along a preset direction; the conductive layer (212) is covered with a first active material layer (214), and the first active material layer (214) at least partially covers the insulation layer (213); setting that a thickness of the conductive layer (212) is m, and a thickness of the insulation layer (213) is n, then n≤m.

A housing (10) of a battery cell (100) is provided, which includes: a housing body, having a through hole (11), , in a first direction (A), the housing body includes a first side (a) and a second side (b) opposite to each other; a positive terminal (3), passing through the through hole (11); an upper insulation member (5), disposed between the positive terminal (3) and the housing body to insulate the positive terminal (3) from the housing body; a negative terminal (4), including a first terminal layer (41) and a second terminal layer (42) disposed along the first direction (A), the first terminal layer (41) and the second terminal layer (42) are electrically connected, the second terminal layer (42) is electrically connected with the first side (a), the material of the first terminal layer (41) is different from the second terminal layer (42).

A battery cover plate and a secondary battery are provided. The battery cover plate includes a cover plate body (10) provided with an electrode terminal hole (11); and an electrode terminal assembly including an electrode terminal body (30) and a limiting piece (40). The electrode terminal body (30) is inserted into the electrode terminal hole (11). The limiting piece (40) is engaged with the electrode terminal body (30) in a thickness direction of the electrode terminal body (30) to fix the limiting piece (40) made of a first material. A portion of the electrode terminal body (30) engaged with the limiting piece (40) is made of a first conductive material (31). A hardness of the first material is greater than a hardness of the first conductive material (31).

The present disclosure discloses a negative electrode sheet, an electrochemical device, and an electronic equipment. A specific surface area decrease rate P<0> of the negative electrode sheet is 12% to 18%; wherein P<0>=1-P, P is a ratio of a specific surface area of the negative electrode sheet under a second compaction to the specific surface area of the negative electrode sheet under a first compaction; an electrode sheet porosity ε of the negative electrode sheet is 13% or more, wherein the electrode sheet porosity is the electrode sheet porosity of the negative electrode sheet under the second compaction. The electrochemical device (especially a lithium-ion battery) containing the above can ensure excellent discharge capacity, fast charging performance, and cycle performance, and take into account excellent energy density, cycle performance, and storage performance.

Disclosed are a graphite material and a method for preparing the same, an electrochemical device and an electronic apparatus. The graphite material satisfies the following conditions: La≤72nm, Lc≤15nm; wherein, La is a lattice constant of a graphite crystal in a 110 plane in the graphite material, Lc is a lattice constant of the graphite crystal in a 002 plane in the graphite material; F≥15mN, F is a particle crushing force. The electrochemical device (especially lithium-ion battery) containing the same may ensure an excellent initial efficiency and fast-charging performance, while maintaining an excellent self-discharge performance, capacity performance and cycling performance.

A sulfide solid electrolyte, a method of preparing the same, and an application are provided. A molecular formula of the sulfide solid electrolyte is Li<f>P<1-g>E<g>S<w>O<g>Q<z>, where, 5<f<10, 0<g<1, 3<w<6, 4<w+g<6, 0<z<2, E is selected from one or more of Mg, Ca, Sr, Ba, Zn, Cr, Sn, or Pb, and Q is selected from one or more of Cl, Br, or I. Through the sulfide solid electrolyte, the method of preparing the same, and the application provided by the disclosure, the stability of ionic conductivity of the sulfide solid electrolyte is increased, the air stability is enhanced, and the electrolyte/active material interface properties are improved, so that the service life and safety of an all-solid-state lithium-ion battery are increased.

Provided are a solid-state battery (10) and an application thereof. The solid-state battery (10) at least includes: a first solid-state electrolyte layer (131), disposed on a positive electrode (11) side of the solid-state battery (10), an ionic conductivity of the first solid-state electrolyte layer (131) being 1×10^-4S/cm to 1×10^-2S/cm; and a second solid-state electrolyte layer (132), disposed on a negative electrode (12) side of the solid-state battery (10), an ionic conductivity of the second solid-state electrolyte layer (132) being 1×10^-3S/cm to 2×10^-2S/cm. Through the solid-state battery (10) and the application thereof, the solid-state electrolyte membrane of the solid-state battery (10) may have advantages of high lithium ion conductivity, excellent electrochemical redox stability, and good compatibility with positive electrode (11) and negative electrode (12), thereby improving a performance of the solid-state battery (10).

The invention provides a solid electrolyte membrane and a preparation method and application thereof, wherein the solid electrolyte membrane includes a binder; and a sulfide solid electrolyte, and a molecular formula of the sulfide solid electrolyte is Li_aP_1-bM_bS_cO_dX_e; wherein 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2; M is selected from one or a plurality of Al, Ga, In, Ti, Sc, As, Sb, Bi, As, V, or Nb; X is selected from one or a plurality of Cl, Br, or I; and an ionic conductivity of the solid electrolyte membrane is 1×10^-3 S/cm to 2×10^-2 S/cm. The invention provides a solid electrolyte membrane and a preparation method and application thereof to improve the stability of the conductivity of the solid electrolyte membrane, enhance air stability, improve electrolyte/active material interface properties, and improve the life and the safety of the all-solid-state lithium-ion battery.

A secondary battery (100), a battery assembly (1002), and an electronic device (1000) are provided. The secondary battery (100) includes an electrode assembly (120) including a negative electrode sheet (10), a positive electrode sheet (20), and a separator (122) disposed between the negative electrode sheet (10) and the positive electrode sheet (20). A negative electrode uncoating area (18b) of the negative electrode sheet (10) includes a negative electrode tab (18b2) and a negative electrode connecting area (18b1). The negative electrode tab (18b2) includes a negative electrode tab body (18b22) and a negative electrode tab transition portion (18b21) including a first negative electrode tab transition end point (E11). A range of a distance (H3) in a first direction (D1) between the first negative electrode tab transition end point (E11) and the first separator end (122u) of the separator (122) in the first direction (D1) is 0.5mm to 2mm.

Provided are an all-solid-state battery (10) and application thereof, and the all-solid-state battery (10) at least includes: at least two first solid electrolyte layers (131), respectively disposed on a positive electrode (11) side and a negative electrode (12) side of the all-solid-state battery (10), an ionic conductivity of a first solid electrolyte layer (131) is 1×10^-3S/cm to 1×10^-2S/cm; and a second solid electrolyte layer (132), disposed between the two first solid electrolyte layers (131), an ionic conductivity of the second solid electrolyte layer (132) is 1×10^-3S/cm to 2×10^-2S/cm. Through the all-solid-state battery and application thereof provided by the disclosure, the lithium dendrite penetration resistance performance of the solid electrolyte membrane in the all-solid-state battery may be improved, the interfacial stability between the solid electrolyte membrane and the negative electrode may be improved, thereby enhancing the cycle performance and safety of the battery.

A cell assembly, a battery module, and a battery pack are provided. The cell assembly includes a cell (100) including a cell body (110), where a first end surface (111) of the cell body (110) is arranged with an electrode post (120) protruding outward, and an insulating ring (130) is arranged between the first end surface (111) and the electrode post (120); and a sealed insulating unit (200) including a sealed insulating cover (210) sealingly connected between the first end surface (111) and the electrode post (120) and covering the insulating ring (130).

An all-solid-state battery (10) and an application thereof are provided. The all-solid-state battery (10) includes at least: a first solid electrolyte layer (131) disposed on a side of a positive electrode (11) of the all-solid-state battery (10), with an ionic conductivity of 1×10<-4>~1×10<-2>S/cm; a second solid electrolyte layer (132) disposed on a side of a negative electrode (12) of the all-solid-state battery (10), with an ionic conductivity of 1×10<-3>~2×10<-2>S/cm; and a third solid electrolyte layer (133) disposed between the first solid electrolyte layer (131) and the second solid electrolyte layer (132), with an ionic conductivity of 1×10<-3>~2×10<-2>S/cm. The disclosure may improve resistance of a solid electrolyte membrane to lithium dendrite penetration in the all-solid-state battery, improve the ionic conductivity, electrochemical reduction stability, and compatibility between the solid electrolyte membrane and the positive and negative electrodes, thereby improving cycle life and safety of a battery.

The disclosure proposes a solid electrolyte membrane and a preparation method and an application thereof. The solid electrolyte membrane includes a binder and a sulfide solid electrolyte. The sulfide solid electrolyte has a molecular formula of Li<f>P<1-g>E<g>S<w>O<g>Q<z>, wherein, 5<f<10; 0<g<1, 3<w<6, 4<w+g<6, 0<z<2; E is selected from one or more of Mg, Ca, Sr, Ba, Zn, Cr, Sn or Pb; Q is selected from one or more of Cl, Br or I. Ionic conductivity of the solid electrolyte membrane is 1×10<-3>S/cm to 2×10<-2>S/cm. Through the solid electrolyte membrane and the preparation method and the application thereof proposed by the disclosure, the stability of the conductivity of the solid electrolyte membrane may be enhanced, the air stability may be enhanced, and the lifetime and safety of all-solid-state lithium-ion batteries may be improved.

The disclosure provides a secondary battery (100), a battery pack (10), and an electronic device (1). The secondary battery (100) includes a housing (110) and an electrode assembly (120); the housing (110) includes an end wall (111) and a sidewall (112) surrounding the end wall (111), the sidewall (112) and the end wall (111) are integrally formed by stretching; the electrode assembly (120) is accommodated in the housing (110); wherein a wall thickness of the end wall (111) is a, a wall thickness of the sidewall (112) is b, 1 < a/b < 3, and the technical issue of battery performance degradation caused by uneven side pressure of the housing (110) on the electrode assembly (120) may be alleviated.

Provided are a cover plate assembly (100, 200) and a battery cell of a secondary battery. The cover plate assembly (100, 200) includes a cover plate (110) provided with a pole post installation hole (112A, 112B); a lower insulation plate (150) located on a first side (110S1) of the cover plate (110) and having a through hole (151A, 151B) corresponding to the pole post installation hole (112A, 112B); and a pole post (220A, 220B) passing through the through hole (151A, 151B) and the pole post installation hole (112A, 112B). In a second direction perpendicular to a first direction (Z), one of the pole post (220A, 220B) and the lower insulation plate (150) includes a protrusion portion (150P, 225P) while the other one includes a recess portion (150R, 225R) matched with the protrusion portion (150P, 225P). The pole post (220A, 220B) further includes a main body portion (225).

Disclosed are a sulfide solid electrolyte and a preparation method and an application thereof. The sulfide solid electrolyte has a molecular formula of Li<a>P<1-b>M<b>S<c>O<d>X<e>; wherein: 5<a<6; 0<b<1; 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2; M is selected from one or more of Al, Ga, In, Ti, Sc, As, Sb, Bi, V or Nb; X is selected from one or more of Cl, Br or I. Through the sulfide solid electrolyte and the preparation method and the application thereof provided by the present disclosure, it is possible to enhance the air stability and chemical stability of the sulfide solid electrolyte, increase the conductivity of the sulfide solid electrolyte, improve the air stability, and ameliorate the electrolyte/active material interface properties, thereby improving the compatibility with active materials, reducing packaging steps and the use of packaging materials, and thus significantly improving the capacity, number of cycles and energy density of lithium-ion batteries.

Disclosed are a battery management system, an encoding method for the battery management system, and an electronic device. The battery management system includes: a battery management control panel (BMC) and at least two battery cell sampling control panels (CMC, CMC1-CMCN). Each of the battery cell sampling control panels (CMC, CMC1-CMCN) includes a bridge chip. The battery management control panel (BMC) is configured to send a first level signal to a GPIO port (GPIO0-GPIO4) of the bridge chip contained in each battery cell sampling control panel (CMC, CMC1-CMCN) to change an ID status of an ID port of the battery cell sampling control panel (CMC, CMC1-CMCN). The first level signal sent by the battery management control panel (BMC) to each of the battery cell sampling control panels (CMC, CMC1-CMCN) is different from one another. The ID status represents a unique identifier of the battery cell sampling control panel (CMC, CMC1-CMCN).

A sulfide solid electrolyte, a method of preparing the same, and an application are provided. The sulfide solid electrolyte has a molecular formula of Li_aP_1-bM_bS_cO_dX_e, where 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2, M is selected from one or more of Al, Ga, In, Ti, Sc, As, Sb, Bi, V, or Nb, and X is selected from one or more of Cl, Br, or I. Through the sulfide solid electrolyte, the method of preparing the same, and the application provided by the disclosure, the stability of ionic conductivity of the sulfide solid electrolyte is increased, the air stability is enhanced, and the electrolyte/active material interface properties are improved, so that the service life and safety of an all-solid-state lithium-ion battery are increased.

A prismatic-housing battery (100) including a housing (10) and two cell assemblies (20) accommodated in the housing (10) is provided. Each cell assembly (20) includes at least two cells (30) stacked along a first direction (A) and a first insulation tape (41) covering the first corner area (305a) of the second cell (32). An outer peripheral surface of each cell (30) along a winding direction (B) includes two plane areas (304) and a first corner area (305a) and a second corner area (305b). The cell (30) adjacent to the housing (10) along the first direction (A) is a first cell (31), and the cell (30) adjacent to another cell assembly (20) is a second cell (32). One end of the first insulation tape (41) extends to the first corner area (305a) of the first cell (31) through the first corner area (305a) of the second cell (32).

A prismatic cell (100) including a shell (10) and two jelly roll assemblies (20) accommodated therein is provided. Each jelly roll assembly (20) includes at least two jelly rolls (30) and a first insulating tape (40), wherein one jelly roll (30) is designated as a first jelly roll (31), and another jelly roll (30) is designated as a second jelly roll (32). An outer peripheral surface of each jelly roll (30) includes two plane regions (304) and a first corner region (305a) and a second corner region (305b) respectively connected to the opposite ends of the two plane regions (304). The first insulating tape (40) covers the first corner region (305a) of the second jelly roll (32). One end of the first insulating tape (40) extends to the first plane region (304a) via the first corner region (305a) of the first jelly roll (31).

Disclosed are an electrolyte and a bipolar battery including the same. The electrolyte includes a first component, the first component being a compound shown by Formula I below, wherein R₁ and R₂ are each independently selected from any one of an alkyl group having 1-3 carbon atoms, an alkenyl group having 2-3 carbon atoms, and a substituent having 1-3 heteroatoms; the heteroatoms are nitrogen atoms and/or sulfur atoms. When the electrolyte containing the compound shown by Formula I of the present disclosure is applied in the bipolar battery, the bipolar battery exhibits a good high-temperature storage performance and a good high-temperature cycling performance.

A secondary battery (1), a battery assembly (100), and an electronic device (1000) are provided. The secondary battery (1) includes: a housing (10) and an electrode assembly (20) accommodated in the housing (10). The electrode assembly (20) includes a wound structure (201) formed by a positive electrode sheet (21), a separator (22), and a negative electrode sheet (23). A positive electrode current collector (211) of the positive electrode sheet (21) includes a positive electrode coated region (212) and a positive electrode uncoated region (213). A negative electrode current collector (231) of the negative electrode sheet (23) includes a negative electrode coated region (232) and a negative electrode uncoated region (233). A part of the positive electrode uncoated region (213) is bent to form a stacked positive electrode tab region (2131). A part of the negative electrode uncoated region (233) is bent to form a stacked negative electrode tab region (2331).

Disclosed are an electrolyte coating, a solid-state battery and an electrical device. The electrolyte coating is coated on the surface of a solid-state electrolyte. The solid-state electrolyte includes one or both of a sulfide electrolyte and a halide electrolyte, wherein the electrolyte coating is a copolymer of tridecafluorooctyl methacrylate and n-butyl methacrylate. By coating the electrolyte coating on the surface of the sulfide electrolyte and the halide electrolyte, the present disclosure significantly increases the stability thereof in the air (even with high humidity) on the premise of not substantially affecting the conductivity thereof.

A secondary battery (100), a battery pack (200) and an electronic device (300) are provided. The secondary battery (100) includes: a housing (110) and an electrode assembly (120). The housing (110) includes a side wall (111) with an opening (112) at one end and a cover plate assembly (140). The cover plate assembly (140) seals the opening (112). The electrode assembly (120) is disposed within the housing (110). The cover plate assembly (140) includes: a first cover plate (141) and a second cover plate (142). The first cover plate (141) covers the opening (112) and is connected with the side wall (111) in a sealed manner. The first cover plate (141) includes a through hole (1411). The second cover plate (142) at least partially blocks the through hole (1411). The second cover plate (142) is connected with the first cover plate (141).

Disclosed are a positive electrode and a preparation method thereof and a battery. The positive electrode includes a current collector, an active material layer, and a conductive layer disposed between the current collector and the active material layer. The conductive layer includes an MXene material. Adding the MXene material in the conductive layer may elevate the conductive performance and stability of the battery, and may also strengthen the adhesion between the current collector and the active material layer, enhance the peel force of the positive electrode, and improve the long-term cycle stability of the battery. In addition, since the addition of the MXene material enhances the adhesion between the current collector and the active material layer, under the condition that the peel strength of the electrode sheet is ensured, the content of binder in the active material layer may be reduced.

A secondary battery (100), a battery pack (200), and an electronic device (300) are provided. The secondary battery (100) includes a casing (110), an electrode assembly (120), a current-collecting member (130), and a sealing plate (160). The casing (110) includes a side wall (111) and a cover plate assembly (140). The side wall (111) includes an opening (112) sealed by the cover plate assembly (140). The electrode assembly (120) mounted in the casing (110) has a winding cell through hole (121). The current-collecting member (130) is electrically connected to the electrode assembly (120) and the casing (110). The sealing plate (160) is arranged on a side of the cover plate assembly (140) away from the electrode assembly (120). The cover plate assembly (140) is provided with a liquid injection hole (170). The sealing plate (160) seals the liquid injection hole (170).

The disclosure provides a cylindrical battery (100), a pack (1002), and an electronic device (1000). The cylindrical battery (100) includes a housing (200) having an opening (205) at one end in a height direction (Hd) of the cylindrical battery (100); an electrode assembly (120) located in the housing (200) and having a winding center hole (120c); a cover plate (220) covering the opening of the housing (200) and having an explosion-proof valve region (222) formed by being surrounded by explosion-proof valves (350). The winding center hole (120c) is located within a range of an orthogonal projection of the explosion-proof valve region (222) of the cover plate (220) in the height direction (Hd). The winding center hole (120c) has a diameter D1, a partial region of the cover plate (220) has a diameter D2, and 35%≥D1/D2≥10%.

Disclosed is a battery pack, including: multiple cells (210); a casing (100), wherein the inner bottom surface (10) of the casing (100) has a stepped surface for dividing the inner bottom surface (10) of the casing (100) into at least two placement areas (11) having a height difference in the height direction of the casing (100), and the cells (210) are placed in each of the placement areas (11). With stepped surfaces disposed on the inner bottom surface (10) of the casing (100), the battery pack may form at least two placement areas (11) with height differences within the casing (100), making it possible to provide a force to the adhesive located in the placement area with a higher height, helping the adhesive flow toward the placement area with lower height.

Zusammenfassung wird geladen …