Search

DE-212026000006-U1 - Battery cell, battery device and power-consuming device

DE212026000006U1DE 212026000006 U1DE212026000006 U1DE 212026000006U1DE-212026000006-U1

Abstract

Battery cell comprising a stacked electrode assembly, wherein the stacked electrode assembly comprises a cathode foil, a separator and an anode foil, which are arranged in a stacked configuration. wherein the anode foil comprises an anode collector and an anode film layer provided on at least one side of the anode collector, wherein the cathode foil comprises a cathode collector and a cathode film layer provided on at least one side of the cathode collector, wherein the cathode film layer comprises an active cathode material, wherein the active cathode material comprises lithium-containing transition metal phosphate particles, where the density of the cathode foil is 2.25 g/ cm³ to 2.65 g/ cm³ , where in the cumulative distribution curve of the roughness area of the particles obtained in a cross-sectional area of the cathode film layer along the thickness direction of the electrode foil, R A50 of the roughness is 0.90 to 0.98, where R A90 of the roughness is more than 0.93, where R A50 is a roughness if, in the cumulative distribution curve of the roughness, the cumulative area fraction of the vertical axis is 50%, where R A90 is a roughness if, in the cumulative distribution curve of the roughness, the cumulative area fraction of the vertical axis is 90%.

Assignees

  • CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

Dates

Publication Date
20260513
Application Date
20260104
Priority Date
20250620

Claims (20)

  1. Battery cell comprising a stacked electrode assembly, wherein the stacked electrode assembly comprises a cathode foil, a separator, and an anode foil arranged in a stacked configuration, wherein the anode foil comprises an anode collector and an anode film layer provided on at least one side of the anode collector, wherein the cathode foil comprises a cathode collector and a cathode film layer provided on at least one side of the cathode collector, wherein the cathode film layer comprises an active cathode material, wherein the active cathode material comprises lithium-containing transition metal phosphate particles, wherein the density of the cathode foil is 2.25 g/ cm³ to 2.65 g/ cm³ , wherein in the cumulative distribution curve of the roughness area of the particles obtained in a cross-sectional area of the cathode film layer along the thickness direction of the electrode foil, R A50 of the roughness is 0.90 to 0.98 is, where R A90 of the roughness is greater than 0.93, where R A50 is a roughness if in the cumulative distribution curve of the roughness the cumulative area fraction of the vertical axis is 50%, where R A90 is a roughness if in the cumulative distribution curve of the roughness the cumulative area fraction of the vertical axis is 90%.
  2. Battery cell after Claim 1 , where in the cumulative distribution curve of the roughness area of the particles obtained in a cross-sectional area of the cathode film layer along the thickness direction of the electrode foil, R A90 of the roughness is 0.93 to 0.995.
  3. Battery cell after Claim 1 or 2 , wherein in the cumulative distribution curve of the roughness area of the particles obtained in a cross-sectional area of the cathode film layer along the thickness direction of the electrode foil, R A10 of the roughness is 0.85 to 0.90, where R A10 is a roughness if in the cumulative distribution curve of the roughness the cumulative area fraction of the vertical axis is 10%.
  4. Battery cell after Claim 1 or 2 , wherein in the cumulative distribution curve of the roughness area of the particles obtained in a cross-sectional area of the cathode film layer along the thickness direction of the electrode foil, the degree of concentration (R A90 -R A10 )/R A50 of the roughness is 0.085 to 0.105.
  5. Battery cell after Claim 1 or 2 , where the density of the cathode foil is 2.35 g/cm 3 to 2.45 g/cm 3 .
  6. Battery cell after Claim 1 or 2 , where the one-sided coating weight of the cathode film layer is 0.33 g/1540.25 mm² to 0.43 g/1540.25 mm² .
  7. Battery cell after Claim 1 or 2 , where the one-sided coating weight of the cathode film layer is 0.36 g/1540.25 mm² to 0.40 g/1540.25 mm² .
  8. Battery cell after Claim 1 or 2 , where the porosity of the cathode foil is between 23% and 32%.
  9. Battery cell after Claim 1 or 2 , wherein the lithium-containing transition metal phosphate particles comprise a lithium-containing transition metal phosphate substrate and a coating layer located on at least a part of the surface of the lithium-containing transition metal phosphate substrate, wherein the coating layer comprises a carbon element.
  10. Battery cell after Claim 9 , wherein the lithium-containing transition metal phosphate substrate has a general formula of Li x1 A y1 Me a1 M b1 P 1-c1 X c1 Y z1 , where 0.5≤x1≤1.3, 0≤y1≤0.8, 0.9≤x1+y1≤1.3; 0.9≤a1≤1.5, 0≤b1≤0.5, 0.9≤a1+b1≤1.5; 0≤c1≤0.5; where 3≤z1≤5; where A comprises one or more of the elements Na, K and Mg; where Me comprises one or more of the elements Mn, Fe, Co, Ni; where M comprises one or more of the elements B, Mg, Al, Si, P, S, Ca, Sc, Ti, V, Cr, Cu, Zn, Sr, Y, Zr, Nb, Mo, Cd, Sn, Sb, Te, Ba, Ta, W, Yb, La, Ce; where X comprises one or more of the elements S, Si, Cl, B, C, N, P; where Y comprises one or more of the elements O, F.
  11. Battery cell after Claim 9 , wherein the lithium-containing transition metal phosphate comprises a lithium iron phosphate.
  12. Battery cell after Claim 9 , wherein the lithium-containing transition metal phosphate comprises Ti element, wherein the mass content of the Ti element is 0.05% to 0.2% based on the mass of the lithium-containing transition metal phosphate.
  13. Battery cell after Claim 1 or 2 , wherein in the cross-sectional area of the cathode film layer along the thickness direction of the electrode foil D A50 of the lithium-containing transition metal phosphate particles is 100 nm to 2.5 µm, where D A50 is a particle size if in the cumulative distribution curve of the areas the cumulative area fraction of the vertical axis is 50%.
  14. Battery cell after Claim 1 or 2 , where the thickness of the cathode collector is 12 µm to 20 µm.
  15. Battery cell after Claim 1 or 2 , where the pressing density of the anode foil is 1.3 g/cm 3 to 1.55 g/cm 3 .
  16. Battery cell after Claim 1 or 2 , where the pressing density of the anode foil is 1.40 g/cm 3 to 1.50 g/cm 3 .
  17. Battery cell after Claim 1 or 2 , wherein the one-sided coating weight of the anode film layer is 0.15 g/1540.25 mm² to 0.207 g/1540.25 mm² .
  18. Battery cell after Claim 1 or 2 , wherein the one-sided coating weight of the anode film layer is 0.17 g/1540.25 mm² to 0.2 g/1540.25 mm² .
  19. Battery cell after Claim 1 or 2 , where the porosity of the anode foil is 23% to 32%.
  20. Battery cell after Claim 1 or 2 , where the thickness of the anode collector is 6 µm to 12 µm.

Description

CROSS-REFERENCE TO RELATED REGISTRATION The present application is based on the Chinese patent application No. filed on June 20, 2025. 202510830382.9 entitled "Battery cell, battery device and power-consuming device" and claims priority for this Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into the present application by reference. 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 In recent years, with the increasing use of secondary batteries, they have been deployed in a wide variety of fields, such as energy storage systems for hydroelectric, thermal, wind, and solar power plants, as well as power tools, e-bikes, e-motorcycles, electric vehicles, and aerospace. Among these, lithium iron hydride system batteries have gained prominence in recent years due to their outstanding safety performance. With the rapid advancement of lithium iron system batteries, higher demands are being placed on their cycle performance and energy density. CONTENT OF THE PRESENT INVENTION The present application relates to the above subject matter and aims to provide a battery cell, a battery device and a power-consuming device, wherein the battery cell in the present application can balance energy density and cycle power. To achieve the above purpose, a first aspect of the present application provides a battery cell comprising a stacked electrode assembly, wherein the stacked electrode assembly comprises a cathode foil, a separator, and an anode foil arranged in a stacked manner, wherein the anode foil comprises an anode collector and an anode film layer provided on at least one side of the anode collector, wherein the cathode foil comprises a cathode collector and a cathode film layer provided on at least one side of the cathode collector, wherein the cathode film layer comprises an active cathode material, the active cathode material comprising lithium-containing transition metal phosphate particles, wherein the density of the cathode foil is 2.25 g/ cm³ to 2.65 g/ cm³ , wherein in the cumulative distribution curve of the roughness area of the particles obtained in a cross-sectional area of the cathode film layer along the thickness direction of the electrode foil, R <sub>A50 </sub> of the roughness is 0.90 to 0.98, where R <sub>A90 </sub> of the roughness is greater than 0.93, where R <sub>A50 </sub> is a roughness if the cumulative area fraction of the vertical axis is 50% in the cumulative distribution curve of the roughness, and where R<sub>A90</sub> is a roughness if the cumulative area fraction of the vertical axis is 90% in the cumulative distribution curve of the roughness. The battery cell in the present application can balance energy density and cycle power. In some embodiments, in the cumulative distribution curve of the roughness area of the particles obtained in a cross-section of the cathode film layer along the thickness direction of the electrode foil, R <sub>A90</sub> of the roughness is 0.93 to 0.995, where R<sub> A90 </sub> is a roughness value when the cumulative area fraction of the vertical axis in the cumulative distribution curve is 90%. In some embodiments, in the cumulative distribution curve of the roughness area of the particles obtained in a cross-section of the cathode film layer along the thickness direction of the electrode foil, R <sub>A10</sub> of the roughness is 0.85 to 0.90, where R<sub> A10 </sub> is a roughness value when the cumulative area fraction of the vertical axis in the cumulative distribution curve is 10%. R A10 and R A90 of the roughness are within the above range, which suggests that the particles in the cathode film layer have a high degree of smoothness on the surface and can slide easily under the influence of external forces. In some embodiments, the concentration degree ( RA90-RA10 )/ RA50 of the roughness in the cumulative distribution curve of the roughness area of the particles obtained in the cross-sectional area of the cathode film layer along the thickness direction of the electrode foil is 0.085 to 0.105. The low concentration degree of roughness in the cathode film layer indicates that the distribution of the roughnesses of the particles in the cathode film layer is narrow and well concentrated. In some embodiments, the density of the cathode foil is 2.35 g/ cm³ to 2.45 g/ cm³ . Therefore, it is advantageous for the battery cell to achieve a high energy density. In some embodiments, the one-sided coating weight of the cathode film layer is 0.33 g/1540.25 mm² to 0.43 g/1540.25 mm² . In some embodiments, the one-sided coating weight of the cathode film layer is 0.36 g/1540.25 mm² to 0.40 g/1540.25 mm² . Therefore, it is advantageous for the battery to achieve a high energy density. In some embodiments, the porosity of the cathode foil is between 23% and 32%. A porosity in this range