Amperex Technology Limited Patente

A secondary battery includes a non-aqueous electrolyte. The non-aqueous electrolyte includes: fluoroethyl propionate, where the fluoroethyl propionate is selected from the group consisting of 2,2-difluoroethyl propanoate, 2,2,2-trifluoroethyl propionate, and a combination thereof, and based on a total mass of the non-aqueous electrolyte, a mass percentage of the fluoroethyl propionate is 5% to 65%; and ethylene carbonate (EC) and propylene carbonate (PC), where based on the total mass of the non-aqueous electrolyte, the sum of the mass percentages of the ethylene carbonate (EC) and the propylene carbonate (PC) is less than or equal to 15%.

An electrochemical device and an electronic device. A packaging bag of the electrochemical device includes a main portion and a top seal portion connected together. A sealed region of the top seal portion includes an edge point Q2 close to an edge of the cell assembly and located on a first wall. The top seal portion includes the first wall extending along a first direction. A second wall of the main portion is connected to the first wall and a third wall. A connection point Q3 is formed at a junction between the second wall and the third wall. An angle R between the first wall and a straight line K1 satisfies: 80° ≤ R ≤ 110°; and/or along the first direction, a distance h between the edge point Q2 and the connection point Q3 satisfies: 0 mm ≤ h ≤ 1 mm.

The present application discloses a secondary battery and an electronic apparatus. The secondary battery includes a first shell, a second shell, and an electrode assembly. The first shell includes a first portion and a second portion, where the second portion surrounds an edge of the first portion. The second shell includes a third portion and a fourth portion, where the fourth portion surrounds an edge of the third portion; the second shell and the first shell are assembled together, and the second shell is insulatedly connected to the first shell. The electrode assembly includes a plurality of first electrode plates and a plurality of second electrode plates, where an outermost first electrode plate of the electrode assembly is a first sub-electrode plate; an outermost second electrode plate of the electrode assembly is a second sub-electrode plate. The first sub-electrode plate includes a first current collector, where the first current collector has a first surface and a second surface opposite to each other, and the first surface is electrically connected to the first portion; the second sub-electrode plate includes a second current collector, where the second current collector has a third surface and a fourth surface opposite to each other, and the third surface is electrically connected to the third portion. This solution is advantageous for reducing the dimension of the secondary battery and increasing the volumetric energy density of the secondary battery.

A secondary battery, in which an outermost electrode plate of an electrode assembly is a first single-sided positive electrode plate. The first single-sided positive electrode plate includes a first positive electrode coating facing the first negative electrode plate, and a capacity of the first positive electrode coating is C<11>. The first negative electrode plate includes a first negative electrode coating facing the first positive electrode coating, and a capacity of the first negative electrode coating is C<21>. The first inner positive electrode plate includes a first inner positive electrode coating facing the first inner negative electrode plate, and a capacity of the first inner positive electrode coating is C<31>. The first inner negative electrode plate includes a first inner negative electrode coating facing the first inner positive electrode coating, and a capacity of the first inner negative electrode coating is C<41>, satisfying: 1 < (C<21>/C<11>)/(C<41>/C<31>) < 1.12.

An electrode plate composite (10) includes a negative electrode plate (11), a first separator (12), a second separator (13), and a plurality of positive electrode plates (14). The negative electrode plate (11) includes a first current collector (111), a first active material layer (112), and a second active material layer (113). The first current collector (111) includes a first surface (1111) and a second surface (1112) arranged opposite to each other along a first direction (X). The first active material layer (112) is disposed on the first surface (1111), and the second active material layer (113) is disposed on the second surface (1112). The plurality of positive electrode plates (14) are alternately laminated on the first separator (12) and the second separator (13), and projections of the plurality of positive electrode plates (14) along the first direction (X) do not overlap.

A secondary battery (100) includes an electrode assembly (20) with a wound structure, and the electrode assembly (20) includes a first electrode plate (21). The first electrode plate (21) includes a first current collector (211) and a first active material layer (212), and the first current collector (211) includes a first surface (211A) and a second surface (211B). The first current collector (211) includes a first section (2111) and a second section (2112), where the first surface (211A) and the second surface (211B) of the first section (2111) are both provided with the first active material layer (212), the second surface (211B) of the second section (2112) is provided with the first active material layer (212), and the first surface (211A) of the second section (2112) is not provided with an active material layer. A position where the first section (2111) and the second section (2112) meet is defined as a boundary line (101), and the first electrode plate (21) corresponding to the first section (2111) includes a first region (213), where the first region (213) is a region extending by a distance L₁ from the boundary line (101) along a direction from the second section (2112) toward the first section (2111), and 0.5 mm ≤ L₁ ≤ 5 mm. The first current collector (211) in the first region (213) is a first sub-section (2111A), the first active material layer (212) on the first surface (211A) of the first sub-section (2111A) is a first portion (212A), and at least one recess (102) is provided on the first portion (212A).

A secondary battery includes an electrode assembly having a winding structure and an electrolyte. The electrode assembly includes a positive electrode, a separator, and a negative electrode, where the positive electrode and the negative electrode each include a current collector and a material layer disposed on at least one surface of the current collector. The negative electrode material layer extends beyond the positive electrode material layer in a winding direction, the extended region is a first region, a length of the first region is L mm, a length of the negative electrode material layer is L₀ mm, and 0.8% ≤ L/L₀ ≤ 18%. The electrolyte includes 1,3-propanesultone, and based on total mass of the electrolyte, a mass content of the 1,3-propanesultone is A%, where 0.01 ≤ A ≤ 8.

This application provides a cylindrical battery and an electric device. The cylindrical battery includes an electrode assembly and an adhesive tape. The electrode assembly is a wound structure and has a winding central axis. The electrode assembly includes a first electrode sheet and a first tab. An outermost turn of the first electrode sheet is connected to the first tab. The first electrode sheet is provided with a winding tail end. The adhesive tape includes a first portion and a second portion. The first portion is attached to the first electrode sheet. The second portion is attached to the first tab. Along a winding direction of the electrode assembly, the second portion includes a first side and a second side that are oppositely disposed. The second side is closer to the winding tail end than the first side. The first portion is located on the first side. When viewed from an extension direction of the winding central axis, a line connecting a winding center and one end of the first portion close to the second portion is defined as a first virtual line, a line connecting the winding center and one end of the first portion away from the second portion is defined as a second virtual line, and an angle between the first virtual line and the second virtual line is not less than 10°, reducing a possibility of fracture at a welding edge.

A battery cell, including an electrode assembly and a packaging bag, where the electrode assembly includes a tab, the packaging bag is configured to accommodate the electrode assembly, a sealing zone is formed on a periphery of the packaging bag, one end of the tab is electrically connected to a body of the electrode assembly, and the other end of the tab protrudes out of the sealing zone; the sealing zone is provided with a weak zone, and in a predetermined temperature range, a packaging tension of the weak zone in the packaging bag reduces to release gas inside the battery cell to the outside of the battery cell. This application further discloses an electronic apparatus, including a battery, where the battery includes a battery cell and a housing accommodating the battery cell, and the battery cell includes the foregoing battery cell.

A secondary battery includes a housing and an electrode assembly. The housing includes a packaging film. The packaging film is wrapped around to enclose the electrode assembly. The housing further includes an adhesive layer. The packaging film is coated with the adhesive layer on a surface facing away from the electrode assembly. The adhesive layer includes a resin compound. A tensile elongation at break of the packaging film is φ₁, and a tensile elongation at break of a part of the housing coated with the adhesive layer is φ₂, wherein φ₂ < φ₁.

A temple arm (10) includes a housing (11), a first electrode assembly (12), an electrolyte solution, and an acoustic assembly (13), and the housing (11) includes a first chamber (Q1) and a second chamber (Q2). The first electrode assembly (12) includes a first electrode terminal (121), the first electrode assembly (12) is disposed in the first chamber (Q1), and the first electrode terminal (121) extends out of the first chamber (Q1) and is located within the housing (11). The electrolyte solution is directly accommodated in the first chamber (Q1). The acoustic assembly (13) is disposed in the second chamber (Q2) and electrically connected to the first electrode terminal (121). The first electrode terminal (121) extends out of the first chamber (Q1) and is located within the housing (11), and the electrolyte solution is directly accommodated in the first chamber (Q1).

A hard carbon material has a flake-like structure, where a length of the flake-like structure is denoted as L, and a width of the flake-like structure is denoted as D1, where L satisfies: 2 µm ≤ L ≤ 16 µm; and D1 satisfies: 0.1 µm ≤ D1 ≤ 3 µm. The hard carbon material can have good contact between particles thereof, better processing performance, and a higher gram capacity, thereby further increasing the compacted density of the battery electrode plate, reducing electrode plate resistance, and improving the energy density of the secondary battery while improving the rate performance, and cycling performance of the secondary battery.

A secondary battery includes an electrolyte and a negative electrode plate, where a viscosity of the electrolyte is P MPa·s. A first material layer includes a first negative electrode active material, which includes no silicon element. A second material layer includes a second negative electrode active material and a polyurethane binder. Based on a mass of the second material layer, a mass percentage of the silicon element is W₁%, and a mass percentage of the polyurethane binder is W₂%. Along a thickness direction of the negative electrode plate, the negative electrode active material layer is provided with at least one groove, where a cross-sectional area of the groove is S µm², and a depth of the groove is H µm. Wherein 1≤W₁≤50, and S=K₁+20W₁; 400≤K₁≤800;1≤W₂≤10, 2≤P≤8, and H=K₂W₂P/S;800≤K₂≤1200.

A secondary battery includes a current interrupt device. A trigger pressure of the current interrupt device is a kPa, 1 ≤ a ≤ 4. The secondary battery contains an electrolyte solution. The electrolyte solution includes a chain ester. A saturation vapor pressure of the chain ester at 25 °C ranges from 4 kPa to 100 kPa. Based on a mass of the electrolyte solution, a mass percent of the chain ester is b%, 35 ≤ b ≤ 80.

A negative electrode active material is granular, and the negative electrode active material includes first particles and second particles, where a sphericity of the first particles is greater than a sphericity of the second particles, the sphericity of the first particles is 0.6 to 1.0, and a particle size D_v50 of the first particles is smaller than a particle size D_v50 of the second particles. Applying the negative electrode active material of this application to a secondary battery can increase a compacted density of a battery electrode plate, thereby increasing the energy density of the secondary battery while improving the cycling performance of the secondary battery.

A secondary battery, including a negative electrode plate and an electrolyte, where the negative electrode plate includes a negative electrode active material layer. The negative electrode active material layer includes graphite and a silicon-carbon material, and an average sphericity of the silicon-carbon material is 0.81 to 0.95. The electrolyte includes ethylene carbonate, propylene carbonate, ethyl propionate and propyl propionate, where based on a mass of the electrolyte, a mass percentage of the ethylene carbonate is a%, a mass percentage of the propylene carbonate is b%, a mass percentage of the ethyl propionate is c%, a mass percentage of the propyl propionate is d%, and (a+b)/(c+d) is in a range of 0.23 to 1.51.

An coating composition includes a modified melamine salt and a binder. An endothermic temperature of the modified melamine salt is lower than an endothermic temperature of an unmodified melamine salt as characterized by a differential scanning calorimetry curve. A difference between the two endothermic temperatures is Δt, 5 °C ≤ Δt ≤ 100 °C. This configuration enables the electrochemical device to exhibit excellent high-temperature storage performance and mechanical safety performance.

A secondary battery (100) includes a negative electrode plate (22), a positive electrode plate (21), and a separator (23). The positive electrode plate (21) includes a positive current collector (211), a first positive active material layer (212), and a positive tab (213). Along a thickness direction of the positive current collector (211), a surface of the positive current collector (211) is provided with the first positive active material layer (212). The first positive active material layer (212) is provided with a first groove (2121). The positive tab (213) is disposed in the first groove (2121) and is electrically connected to the positive current collector (211). A first positive electrode insulation layer (24) is disposed on a surface of the first positive active material layer (212) facing the negative electrode plate (22). The first positive electrode insulation layer (24) covers the first groove (2121). A first negative electrode insulation layer (24) is disposed on a surface of the negative electrode plate (22) facing the first positive active material layer (212). Along a direction perpendicular to a surface of the first negative electrode insulation layer (25), a projection of the first negative electrode insulation layer (25) on the first positive active material layer (212) covers the first groove (2121). Along a width direction of the first groove (2121), a first hole (2521) is provided on one side of the first negative electrode insulation layer (25).

This application provides an electrochemical device and an electronic device containing same. The electrochemical device includes a positive electrode plate. The positive electrode plate includes a current collector and a positive electrode material layer located on at least one surface of the current collector in a thickness direction of the current collector. The positive electrode material layer includes a first positive electrode material layer and a second positive electrode material layer. The second positive electrode material layer is located between the first positive electrode material layer and the current collector. The positive electrode material layer includes a positive active material. The positive active material includes two or more lithium nickel cobalt manganese oxide ternary materials. The two or more lithium nickel cobalt manganese oxide ternary materials are divided into two groups, with a first group of lithium nickel cobalt manganese oxide ternary materials being represented by a chemical formula Li<n1>Ni<x1>Co<y1>Mn<z1>M1<m1>O<2>, satisfying x1 + y1 + z1 + m1 = 1 and 0.15 ≤ y1 ≤ 0.60, with a second group of lithium nickel cobalt manganese oxide ternary materials being represented by a chemical formula Li<n2>Ni<x2>Co<y2>Mn<z2>M2<m2>O<2>, satisfying x2 + y2 + z2 + m2 = 1 and 0 < y2 ≤ 0.14. The two groups of lithium nickel cobalt manganese oxide ternary materials are located in the first positive electrode material layer and the second positive electrode material layer respectively. The positive electrode plate meets the above characteristics, thereby improving the discharge performance of the electrochemical device at a low temperature and a low SOC.

A secondary battery includes an electrode assembly (100). The electrode assembly (100) is of a wound structure and includes a positive electrode plate (40), a negative electrode plate (30), a first separator (10), and a second separator (20). The negative electrode plate (30) is provided between the first separator (10) and the second separator (20). The first separator (10) includes an aqueous bonding layer (12), and the second separator (20) includes an oily bonding layer (22). The aqueous bonding layer (12) includes a first binder, and the oily bonding layer (22) includes a second binder.

This application discloses a secondary battery and an electronic apparatus. The secondary battery includes a packaging pouch, an electrode assembly, an electrical connection member, a first insulating member, and a second insulating member, where the electrode assembly is located in the packaging pouch, the electrode assembly includes a main body portion and a tab assembly, the tab assembly includes a plurality of tabs, and the electrical connection member is located outside the packaging pouch and is electrically connected to the tab assembly. The tab assembly includes a first portion and a second portion. The first portion protrudes from the main body portion and is connected to the second portion. The second portion is bent toward the main body portion, the second portion forms a weld mark with the electrical connection member, and the second portion includes a first surface and a second surface. The first insulating member covers the weld mark, the second insulating member is located on one side in a thickness direction of the tab, and the second insulating member extends from the first surface of the second portion through the first portion to the main body portion. A thickness of the first insulating member is T₁, a thickness of the second insulating member is T₂, T₁ > T₂, 25 µm ≤ T₁ ≤ 60 µm, and T₂ ≥ 4 µm, balancing the safety performance and drop performance of the secondary battery.

This application provides a secondary battery and an electronic device. The secondary battery includes an electrode assembly. The electrode assembly includes first electrode plates, second electrode plates, and separators. The first electrode plates include two outer first electrode plates and an inner first electrode plate. The two outer first electrode plates are located on two outermost sides of the electrode assembly respectively. The first electrode plate includes a first current collector and a first active material layer. The first current collector includes a first surface and a second surface. At least one of the outer first electrode plates is a single-side-coated first electrode plate. The first active material layer applied to the second surface of the single-side-coated first electrode plate is a first material layer. Both the first surface and the second surface of the inner first electrode plate are coated with the first active material layer. The first active material layer applied to the first surface and the second surface of the inner first electrode plate is a second material layer. A conductivity of the single-side-coated first electrode plate is a S/cm, and a conductivity of the inner first electrode plate is b S/cm, satisfying a ≤ b. This configuration reduces the risk of black spots and lithium plating on the outer electrode plates of the electrode assembly.

This application relates to the technical field of energy storage, and specifically discloses a secondary battery, a secondary battery manufacturing method, and an electrical device. The secondary battery includes an electrode assembly. The electrode assembly includes a first electrode plate, a second electrode plate, a separator, and a filler. The first electrode plate includes a first current collector and a first active material layer. The second electrode plate includes a second current collector and a second active material layer. The separator is disposed between the first active material layer and the second active material layer. The first active material layer is provided with a groove. The groove includes a groove opening and a groove wall. Another side of the separator facing the groove opening corresponds to the second active material layer. The filler includes a filling portion. The filling portion is located in the groove. The filling portion covers at least a part of the groove wall. The filler can separate the separator from lithium dendrites deposited in the groove, and limit the growth of lithium dendrites in the groove toward the separator, thereby hindering the lithium dendrites from piercing the separator.

A secondary battery and an electronic apparatus are provided. The secondary battery includes a housing made of a metal material, a wound electrode assembly, a first tab, and a first layer. The housing includes a first wall and a first conductive member provided on the first wall. The first tab includes a first extension section, a second extension section, and a third extension section. The first extension section includes a first end connected to a first electrode plate, and the first extension section extends from the first end toward a first side in a thickness direction of the electrode assembly and is inclined with respect to the thickness direction. The second extension section includes a second end connected to the first extension section. Viewed along a third direction, the second extension section extends from the second end toward the first side and is inclined with respect to the thickness direction. The third extension section is electrically connected to the first conductive member and includes a third end connected to the second extension section. A distance between the third end and the first wall is greater than a distance between the second end and the first wall. The first layer is provided on a surface of the second extension section facing the electrode assembly and extends to the first extension section and the third extension section. The reliability can be improved, and the service life can be prolonged.

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A battery cell, an electronic device, and a battery cell packaging method are provided. The battery cell includes an electrode assembly, a tab, and a packaging pouch. The tab is connected to one side of the electrode assembly along a first direction. The packaging pouch includes a main portion and a sealing portion. The electrode assembly is disposed in the main portion. The main portion includes a top wall as well as a first wall and a second wall that are connected to two sides of the top wall respectively along a second direction. The sealing portion includes a top seal edge and a side seal edge. The tab extends out from the top seal edge. The side seal edge is connected to the first wall. The packaging pouch is formed by folding and hermetically securing a packaging film along the second wall. Along the second direction, a spacing between the electrode assembly and the first wall is W1, and a spacing between the electrode assembly and the second wall is W2, |W1 - W2| ≤ 30 µm. The third direction is a thickness direction of the electrode assembly. The first direction, the second direction, and the third direction are perpendicular to each other. The battery cell can improve safety performance.

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