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DE-212026000004-U1 - Battery cell, battery device, power-consuming device

DE212026000004U1DE 212026000004 U1DE212026000004 U1DE 212026000004U1DE-212026000004-U1

Abstract

Battery cell, characterized in that it comprises a stacked electrode assembly and an electrolyte solution, wherein the stacked electrode assembly comprises a cathode foil, a separator and an anode foil which are provided in a stacked arrangement, wherein the cathode foil comprises an active cathode material, wherein the active cathode material comprises a lithium-containing phosphate, wherein the lithium-containing phosphate comprises a lithium-containing phosphate substrate and a cathode coating layer which is coated on at least a part of a surface of the lithium-containing phosphate substrate, wherein the cathode coating layer comprises a carbon element, wherein the density of the cathode foil is 2.3 g/ cm³ to 2.65 g/ cm³ ; wherein the anode foil comprises an active anode material, wherein the active anode material comprises graphite, wherein the pressing density of the anode foil is 1.30 g/cm 3 to 1.52 g/cm 3 ; wherein the electrolyte solution comprises an organic solvent, wherein the organic solvent comprises a first solvent, wherein the first solvent comprises at least one of a linear carbonate, a linear carboxylic acid ester; wherein the separator is provided between the cathode foil and the anode foil, wherein the separator comprises a base film and an organic coating layer on at least one surface of one side of the base film, wherein the organic coating layer is a continuous layer with a porous structure.

Assignees

  • CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

Dates

Publication Date
20260513
Application Date
20260104
Priority Date
20250620

Claims (20)

  1. Battery cell, characterized in that it comprises a stacked electrode assembly and an electrolyte solution, wherein the stacked electrode assembly comprises a cathode foil, a separator and an anode foil, which are arranged in a stacked manner, wherein the cathode foil comprises an active cathode material, wherein the active cathode material comprises a lithium-containing phosphate, wherein the lithium-containing phosphate comprises a lithium-containing phosphate substrate and a cathode coating layer, which is coated on at least a part of a surface of the lithium-containing phosphate substrate, wherein the cathode coating layer comprises carbon element, wherein the density of the cathode foil is 2.3 g/ cm³ to 2.65 g/ cm³ ; wherein the anode foil comprises an active anode material, wherein the active anode material comprises graphite, wherein the density of the anode foil is 1.30 g/ cm³ to 1.52 g/ cm³ ; wherein the electrolyte solution comprises an organic solvent, wherein the organic solvent comprises a first solvent, wherein the first solvent comprises at least one of a linear carbonate, a linear carboxylic acid ester; wherein the separator is provided between the cathode foil and the anode foil, wherein the separator comprises a base film and an organic coating layer on at least one surface of one side of the base film, wherein the organic coating layer is a continuous layer with a porous structure.
  2. Battery cell after Claim 1 , characterized in that the organic coating layer comprises a fluorine-containing polymer.
  3. Battery cell after Claim 2 , characterized in that the area fraction of a region comprising the fluorine-containing polymer is 50% to 90% within a 50 µm × 50 µm area of the organic coating layer.
  4. Battery cell after Claim 2 or 3 , characterized in that the fluorine-containing polymer comprises one or more of polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer.
  5. Battery cell after one of the Claims 1 until 4 , characterized in that the thickness of the organic coating layer is 0.5 µm to 2 µm.
  6. Battery cell after one of the Claims 1 until 5 , characterized in that the separator further comprises an inorganic coating layer, wherein the inorganic coating layer is provided between the base film and the organic coating layer along a thickness direction of the separator.
  7. Battery cell after Claim 6 , characterized in that the inorganic coating layer comprises inorganic particles, wherein the inorganic particles comprise at least one of aluminium oxide, boehmite and magnesium oxide.
  8. Battery cell after one of the Claims 1 until 7 , characterized in that the linear carbonate comprises dimethyl carbonate.
  9. Battery cell after one of the Claims 1 until 8 , characterized in that the linear carboxylic acid ester R 1 -COO-R 2 comprises, wherein R 1 , R 2 each independently comprise at least one C 1 -C 5 alkyl group and one C 1 -C 5 alkyl halide group.
  10. Battery cell after Claim 9 , characterized in that the linear carboxylic acid ester comprises at least one of ethyl acetate, methyl acetate, methyl propionate, propyl acetate, ethyl formate, or isopropyl formate.
  11. Battery cell after one of the Claims 1 until 10 , characterized in that the mass content of the first solvent, based on the total mass of the electrolyte solution, is 8.6% to 77%.
  12. Battery cell after Claim 11 , characterized in that the mass content of the first solvent, based on the total mass of the electrolyte solution, is 34.4% to 66%.
  13. Battery cell after one of the Claims 1 until 12 , characterized in that the ionic conductivity of the electrolyte solution at room temperature is 9.5 ms/cm to 20 ms/cm.
  14. Battery cell after Claim 13 , characterized in that the ionic conductivity of the electrolyte solution at room temperature is 12 ms/cm to 16 ms/cm.
  15. Battery cell after one of the Claims 1 until 14 , characterized in that the electrolyte solution comprises an electrolyte salt, wherein the electrolyte salt comprises one or more of lithium hexafluorophosphate and lithium bis(fluorosulfonimide).
  16. Battery cell after Claim 15 , characterized in that the mass content of the electrolyte salt, based on the total mass of the electrolyte solution, is 12% to 20%.
  17. Battery cell after Claim 15 or 16 , characterized in that the electrolyte salt comprises lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide, wherein the mass ratio of lithium hexafluorophosphate to lithium bis(sulfonyl)imide is 1.2 to 3.
  18. Battery cell after one of the Claims 1 until 17 , characterized in that the ratio of the mass of the electrolyte solution to the capacity of the battery cell is 2.8 g/Ah to 3.5 g/Ah.
  19. Battery cell after Claim 18 , characterized in that the ratio of the mass of the electrolyte solution to the capacity of the battery cell is 3.0 g/Ah to 3.2 g/Ah.
  20. Battery cell after one of the Claims 1 until 19 , characterized in that the one-sided density of the cathode foil is 0.33 g/1540.25 mm 2 to 0.45 g/1540.25 mm 2 .

Description

CROSS-REFERENCE TO RELATED REGISTRATION The present application claims priority from Chinese patent application no. 202510828097.3 and entitled “Battery cell, battery device and power-consuming device”, which were filed with the State Intellectual Property Administration in China on June 20, 2025, and are incorporated in their entirety by reference as part of the present application. TECHNICAL AREA The present application relates to the technical field of batteries, in particular a battery cell, a battery device and a power-consuming device. STATE OF THE ART The new energy industry is gaining increasing attention. Battery technology is a key factor in the development of this industry. The development of battery technology requires consideration of various design factors, such as energy density, cycle life, lifespan, capacity, fast-charging performance, reliability, etc. A pressing technical problem is how to develop a battery cell with high energy density, good fast-charging performance, and excellent cycle performance. CONTENT OF THE PRESENT INVENTION The present application is made in view of the aforementioned subject matter with the aim of providing a battery cell with high energy density, good fast charging performance and excellent cycle performance. To achieve the above purpose, the present application provides a battery cell, a battery device and a power-consuming device. A first aspect provides a battery cell comprising a stacked electrode assembly and an electrolyte solution, wherein the stacked electrode assembly comprises a cathode foil, a separator, and an anode foil arranged in a stacked configuration, the cathode foil comprising an active cathode material, the active cathode material comprising a lithium-containing phosphate substrate, and a cathode coating layer coated on at least a portion of the surface of the lithium-containing phosphate substrate, the cathode coating layer comprising a carbon element, the density of the cathode foil being 2.3 g/ cm³ to 2.65 g/ cm³ ; the anode foil comprising an active anode material, the active anode material comprising graphite, the density of the anode foil being 1.30 g/ cm³ to 1.52 g/ cm³ . wherein the electrolyte solution comprises an organic solvent, wherein the organic solvent comprises a first solvent, wherein the first solvent comprises at least one of a linear carbonate, a linear carboxylic acid ester; wherein the separator is provided between the cathode foil and the anode foil, wherein the separator comprises a base film and an organic coating layer on at least one surface of one side of the base film, wherein the organic coating layer is a continuous layer with a porous structure. In one embodiment of the present application, the battery cell comprises a stacked electrode assembly, wherein the stacked electrode assembly includes a cathode foil, a separator, and an anode film layer, the cathode foil and the anode film layer having a high compression density. Furthermore, the lithium-containing phosphate cathode coating layer comprises a carbon element and is combined with an electrolyte solution containing at least one linear carbonate and one linear carboxylic acid ester, so that the battery cell exhibits a higher energy density and improved fast-charging performance. The organic coating layer in the separator is a continuous layer with a porous structure. In this way, the bonding strength between the separator, the cathode foil, and the anode foil is improved, and the risk of a gap between the separator, the cathode foil, and the anode foil can be reduced. This reduces the risk of gases escaping from the linear carbonate and the linear carboxylic acid ester through at least one organic solvent. The formation of gases that accumulate at the gap between the separator and the cathode and anode foils can be reduced, the adverse effect of these gases on lithium ion transfer can be minimized, the risk of lithium precipitation is reduced, and thus the cycle performance of the battery cell can be favorably improved. Therefore, the battery cell of the present application can exhibit higher energy density, better fast-charging performance, and improved reliability. In some embodiments, the organic coating layer comprises a fluorine-containing polymer. The organic coating layer containing the fluorine-containing polymer has improved bonding properties, which helps to increase the bond strength between the separator and the cathode and anode foils, thereby reducing the risk of lithium ion transfer being blocked due to gas accumulation between the separator and the cathode and anode foils, which leads to lithium precipitation, and improving the cycle performance of the battery cell. In some embodiments, the area fraction of the region comprising the fluorine-containing polymer within a 50 µm × 50 µm area of the organic coating layer is 50% to 90%. The area fraction covered by the fluorinated polymer reflects the continuity of the organic coating layer. T