Battery cell, battery device and power-consuming device

Abstract

Battery cell comprising a stacked electrode arrangement, wherein the stacked electrode arrangement comprises a cathode foil, a separating film and an anode foil stacked on top of each other; wherein the separating film comprises a base film and a coating arranged on both sides of the base film, wherein the coating comprises a ceramic coating and an oil-based adhesive layer, wherein the ceramic coating is arranged between the base film and the oil-based adhesive layer; where the thickness of the one-sided coating is 1 µm to 3 µm.

Description

TECHNICAL AREA

[0001] The present disclosure relates to the field of battery technology and in particular to a battery cell, a battery device and a power-consuming device. STATE OF THE ART

[0002] As the range of applications for secondary batteries has expanded considerably in recent years, they are now used in numerous sectors, including energy storage systems such as hydroelectric, thermal, wind, and solar power plants, as well as in many other applications like power tools, e-bikes, e-motorcycles, electric vehicles, and aerospace. With the rapid development of secondary batteries, the demands on their cycle life and safety performance have also increased.

[0003] Therefore, improving the cycle performance and safety performance of secondary batteries has become an urgent technical problem that needs to be solved. DISCLOSURE OF REGISTRATION

[0004] The present disclosure is made with regard to the problems mentioned above and aims to provide a battery cell, a battery device and a power-consuming device, wherein the battery cell of the present disclosure exhibits excellent cycle performance and safety performance.

[0005] To achieve the aforementioned objectives, the first aspect of the present disclosure provides a battery cell with a stacked electrode arrangement, the stacked electrode arrangement comprising a cathode foil, a separator film and an anode foil stacked on top of each other; the separator film comprising a base film and a coating arranged on both sides of the base film, the coating comprising a ceramic coating and an oil-based adhesive layer, the ceramic coating being arranged between the base film and the oil-based adhesive layer; wherein the thickness of the one-sided coating is 1 µm to 3 µm.

[0006] In this disclosure, the separating film of the battery cell comprises a coating, and the coating comprises a ceramic coating and an oil-based adhesive layer. The ceramic coating exhibits excellent wetting properties, promotes the uptake of the electrolyte solution during the cycling process, and improves the electrolyte solution retention capacity of the separating film, thereby reducing the risk of lithium precipitation during the cycling process. This contributes to improving the cycling performance and safety performance of the battery cells. The oil-based adhesive layer refers to the adhesive layer that is formed by dissolving the adhesive material in an oil-based solvent such as N-methylpyrrolidone and dissolving the adhesive material at 90 °C to 120 °C, so that a porous network structure is formed, as can be seen under a scanning electron microscope.Due to the similar polarity of the adhesive material and the oil-based solvent, they exhibit good compatibility. Therefore, the adhesive material distributes more evenly in the oil-based adhesive layer after dissolving. Compared to the water-based adhesive layer, the oil-based adhesive layer exhibits stronger adhesion, which increases the bond strength between the separator film and the electrode foil. This allows for a tighter bond between the electrode foils during long-term cycles and thus effectively improves the problem of contact failure at the interface between the electrode foils, further enhancing the cycle performance and safety of the battery cells.Furthermore, the separating film presented in this disclosure utilizes a double-sided coating, which increases the strength of the separating film compared to a single-sided coating and further improves the safety performance of the battery cell. Based on this, by specifying the thickness of the single-sided coating within the aforementioned range, it is ensured that both the adhesion strength between the separating film and the electrode foil and the electrolyte solution retention capacity of the battery cell remain within a suitable range, which will contribute to further improving the cycle performance and safety performance of the battery cells.

[0007] In some embodiments, the thickness of the single-sided coating is 1 µm to 2.5 µm. This also contributes to improving the cycle performance and safety performance of the battery cells.

[0008] In some embodiments, the thickness of the separating film is specified as being between 9 µm and 13 µm. This contributes to improving the safety performance of the battery cells.

[0009] In some embodiments, the coating weight of the single-sided coating is provided for to be 2 mg / 1540.25 mm². 2 up to 4.5 mg / 1540.25 mm 2 This allows for further improvements in the cycle performance and safety performance of the battery cells.

[0010] In some embodiments, the oil-based adhesive layer comprises an adhesive material, wherein the adhesive material includes one or more components of polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene copolymer. This further improves the cycle performance and safety performance of the battery cells. In some embodiments, the adhesive material comprises polyvinylidene fluoride.

[0011] In some embodiments, the ceramic coating comprises a ceramic material, wherein the ceramic material includes one or more of the following: aluminum oxide, boehmite, silicon dioxide, magnesium oxide, titanium dioxide, tin oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, aluminum hydroxide, magnesium hydroxide, and calcium hydroxide. This contributes to improving the cycle performance of the battery cells. In some embodiments, the ceramic material includes aluminum oxide.

[0012] In some embodiments, the average particle size of the ceramic material is between 0.2 µm and 0.8 µm. This contributes to improving the cycle life and safety performance of the battery cells.

[0013] In some embodiments, the length-to-width ratio of the cathode foil and / or the anode foil is 4:5. This prevents heat buildup inside the battery cell, thus preventing the SEI film from degrading and regenerating, and further improving the cycle life and safety of the battery cells. In some embodiments, the length-to-width ratio of the cathode foil and / or the anode foil is 4.3:4.8.

[0014] In some embodiments, the compression density of the anode foil is provided for to be 1.4 g / cm³. 3 up to 1.6 g / cm³ 3 This improves the wetting rate of the electrolyte solution in the anode foil, which increases the kinetic performance of the electrode foil and reduces the risk of lithium excretion.

[0015] In some embodiments, the anode foil comprises an anode current collector and an anode film layer located on at least one side of the anode current collector, comprising an active anode material; wherein the active anode material comprises a graphite material, the volumetric particle size distribution Dv50 of the graphite material being between 15 µm and 22 µm. This contributes to a further improvement in the cycle performance and safety performance of the battery cells.

[0016] In some embodiments, the specific surface area of ​​the graphite material is in the range of 0.5 m². 2 / g up to 2 m 2 / g. This contributes more to improving the cycle performance and safety performance of the battery cells.

[0017] In some embodiments, the one-sided coating weight of the anode film layer is 160 mg / 1540.25 mm². 2up to 200mg / 1540.25 mm 2 This also contributes to improving the cycle performance of the battery cells.

[0018] In some embodiments, the anode film layer comprises a first active anode layer and a second active anode layer, with the second active anode layer positioned between the anode current collector and the first active anode layer. The density of the first active anode layer is lower than that of the second active anode layer. Therefore, the upper first active anode layer exhibits greater porosity, providing a smoother channel for lithium ion transport. This can rapidly improve lithium ion insertion / extraction kinetics, reduce the risk of lithium precipitation in the battery cell, and thus contribute to improved safety performance and cycle life. Furthermore, the lower second active anode layer has a high density, which positively impacts the energy density of the battery cell.

[0019] In some embodiments, the density of the first active anode layer is specified as 1.35 g / cm³. 3 up to 1.5 g / cm³ 3 This contributes to further improvements in cycle performance and the safety performance of the battery cells.

[0020] In some embodiments, the density of the second active anode layer is provided for to be 1.5 g / cm³. 3 up to 1.75g / cm³ 3 This contributes to improving the energy density of the battery cell.

[0021] In some embodiments, the first active anode layer and the second active anode layer each comprise a graphite material, with the mass ratio of the graphite material in the first active anode layer and the second active anode layer being 4:6 to 6:4. This helps to balance the safety performance, cycle life, and energy density of the battery cells.

[0022] In some embodiments, the battery cell also includes an electrolyte with an electrical conductivity of 10 S / m to 15 S / m. This facilitates lithium ion transport and reduces lithium deposition on the surface of the anode foil.

[0023] The second aspect of the present disclosure provides a battery device comprising the battery cell provided in the first aspect.

[0024] A third aspect of the present disclosure provides a power-consuming device comprising a battery device provided in the second aspect. PRESENTATION OF THE REGISTRATION Fig. Figure 1 schematically shows a structural representation of the separating film in a battery cell according to an embodiment of the present disclosure. Fig. Figure 2 is a schematic representation of a battery cell according to an embodiment of the present disclosure, Fig. Figure 3 is an exploded view of a battery cell according to an embodiment of the present disclosure, which is in Fig. 2 is shown. Fig. Figure 4 is a schematic representation of a battery module according to an embodiment of the present disclosure. Fig. Figure 5 is a schematic representation of a battery pack according to an embodiment of the present disclosure. Fig. Figure 6 is an exploded view of a battery pack according to an embodiment of the present disclosure, which is in Fig. 5 is shown. Fig. Figure 7 is a schematic representation of a power-consuming device which, according to one embodiment of the present disclosure, uses the secondary battery as a power source. Fig. Figure 8 is a schematic structural representation of the cross-section of the separating film in the thickness direction from embodiment 1. Fig. Figure 9 is a schematic structural representation of the cross-section of the separating film in the thickness direction from comparative example 3. Reference symbol list: 1 battery pack; 2 Upper case; 3 Lower case; 4 battery modules; 5 battery cells; 51 cases; 52 Electrode arrangement; 53 Cover assembly; 100 release film; 10 Basic film; 20 coating; 201 Ceramic coating; 202 Oil-based adhesive layer; 30 Water-based adhesive layer. SPECIFIC EXECUTION FORMS

[0025] In the following, embodiments of the battery cell, the battery device, and the power-consuming device of the present disclosure are described in detail with reference to the accompanying drawings. However, an unnecessarily detailed description can be omitted. For example, a detailed description of known facts and a repeated description of essentially the same structure can be omitted. This is to avoid making the following description unnecessarily long and to facilitate understanding by those skilled in the art. Furthermore, the drawings and the following description serve to enable those skilled in the art to fully understand the present disclosure and are not intended to limit the subject matter described in the claims.

[0026] In this disclosure, unless otherwise specified, the number range "ab" represents an abbreviation for any combination of real numbers between a and b, where a and b are both real numbers. For example, the number range "0 to 5" means that all real numbers between "0 to 5" are listed in this article, and "0 to 5" is simply an abbreviation for these number combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or the like.

[0027] Unless otherwise stated, all embodiments and optional embodiments of the present disclosure can be combined to form a new technical solution.

[0028] Unless otherwise stated, all technical features and optional technical features of this disclosure can be combined to form a new technical solution.

[0029] Unless otherwise specified, all steps of this disclosure may be carried out sequentially or in any order, but preferably sequentially. For example, if a process includes steps (a) and (b), this means that the process may include steps (a) and (b) carried out sequentially, or steps (b) and (a) carried out sequentially. For example, the said process may also include step (c), which means that step (c) may be inserted into the process in any order; for example, the process may include steps (a), (b), and (c), or steps (a), (c), and (b), or steps (c), (a), and (b), and the like.

[0030] Unless otherwise stated, the terms used in this disclosure have the general meanings which are generally known to those skilled in the art in this field.

[0031] Unless otherwise stated, the values ​​of the parameters mentioned in this disclosure can be determined using various test procedures commonly used in this field, for example, according to the test procedures specified in this disclosure.

[0032] Currently, electrode array structures typically comprise a wound structure and a stacked structure. In the wound structure, the cathode foil, anode foil, and separator film are laid sequentially on top of each other and then wound from one end into a circular cylindrical or square body. The stacked structure is created by stacking the cathode foil, anode foil, and separator film layer by layer in a specific sequence, resulting in a sandwich-like structure. During the charging and discharging process of the battery cell, the lithium insertion and delithiation reactions of the active substance in the battery cell lead to a significant volume expansion.Due to the parallel arrangement of the electrode foils in the laminated battery cell, the adhesion between the electrode foil interfaces is weak. Volume expansion during charging and discharging can easily lead to separation of the electrode foil layers, interrupting contact between the electrode foil interfaces and causing widespread lithium precipitation within the battery cell. Furthermore, the insertion and removal of lithium ions during charging and discharging can result in uneven pressure distribution between the electrode foils. This can displace the electrolyte solution from the gap between the electrode foils, impairing electrolyte retention and consequently causing lithium precipitation.Lithium deposition on the electrode foils is detrimental to the cycle performance of the battery cell and, in extreme cases, can also compromise its safety. In a wound battery cell, where the outer ring encloses the structure of the inner ring, expansion during charging and discharging results in a higher voltage concentration. This leads to higher pressure between the electrode foils, eliminating the problem of poor adhesion at the interface. Furthermore, this coating structure makes it more difficult for the electrolyte solution to be squeezed out and also ensures better electrolyte solution retention. Therefore, improvements are needed to address the problem of lithium deposition in laminated battery cells.

[0033] In related technologies, one approach to improving the lithium precipitation problem is to increase the lateral pressure between the laminated battery cells at the module level, thereby improving the contact between the inner electrode foils of the battery cells. However, this solution results in a large expansion force when the battery cell is fully charged. This forces the electrolyte solution inside the battery cell out and prevents it from flowing back in, leading to lithium precipitation within the battery cell, a deterioration in the battery cell's cycle performance, and even safety risks for the battery cell.On the other hand, optimizing the electrode foil manufacturing process, for example by adjusting the particle size distribution of the active substance and the amount of binder, can achieve a suitable porosity of the electrode foil and thus improve the electrolyte solution retention capacity. However, increased porosity of the electrode foil can lead to a reduction in its strength, making the electrode structure more susceptible to failure during the battery's charging and discharging processes, thereby impairing the battery's cycle performance and safety.

[0034] Based on this, the present disclosure introduces a new battery cell, a battery device, and a new power-consuming device. The battery cell described in this disclosure is characterized by excellent cycle performance and high safety performance. The present disclosure and its alternative embodiments are described in more detail below. Battery cell

[0035] The first aspect of this disclosure provides a battery cell comprising a stacked electrode arrangement, wherein the stacked electrode arrangement comprises a cathode foil, a separator film, and an anode foil stacked on top of each other; wherein the separator film comprises a base film and a coating arranged on both sides of the base film, the coating comprising a ceramic coating and an oil-based adhesive layer, wherein the ceramic coating is arranged between the base film and the oil-based adhesive layer; wherein the thickness of the one-sided coating is 1 µm to 3 µm.

[0036] In this disclosure, the separating film of the battery cell comprises a coating, and the coating comprises a ceramic coating and an oil-based adhesive layer. The ceramic coating exhibits excellent wetting properties, promotes the uptake of the electrolyte solution during the cycling process, and improves the electrolyte solution retention capacity of the separating film, thereby reducing the risk of lithium precipitation during the cycling process. This contributes to improving the cycling performance and safety performance of the battery cells. The oil-based adhesive layer refers to the adhesive layer that is formed by dissolving the adhesive material in an oil-based solvent such as N-methylpyrrolidone and dissolving the adhesive material at 90 °C to 120 °C, so that a porous network structure is formed, as can be seen under a scanning electron microscope.Due to the similar polarity of the adhesive material and the oil-based solvent, they exhibit good compatibility. Therefore, the adhesive material distributes more evenly in the oil-based adhesive layer after dissolving. Compared to the water-based adhesive layer, the oil-based adhesive layer exhibits stronger adhesion, which increases the bond strength between the separator film and the electrode foil. This allows for a tighter fit between the electrode foils during long-term cycles, effectively improving the problem of contact failure at the interface between the electrode foils. This can further improve the cycle performance and safety of the battery cells.Furthermore, the separating film presented in this disclosure utilizes a double-sided coating, which increases the strength of the separating film compared to a single-sided coating and further improves the safety performance of the battery cell. Based on this, by specifying the thickness of the single-sided coating within the aforementioned range, both the adhesion strength between the separating film and the electrode foil and the electrolyte solution retention capacity of the battery cell are maintained within a suitable range, which contributes to further improving the cycle performance and safety performance of the battery cell.

[0037] In this disclosure, the electrode arrangement has a stacked structure.

[0038] In some embodiments, it is provided that several cathode foils and anode foils can be adjusted separately, and several cathode foils and several anode foils can be stacked alternately on top of each other.

[0039] In some embodiments, it is provided that several cathode foils are provided, and anode foils are folded to form several stacked folded segments, with a cathode foil embedded between adjacent folded segments.

[0040] In some embodiments, it is provided that both the cathode foils and the anode foils are folded to form several stacked folded segments.

[0041] In some embodiments, it is provided that several separating films can be configured and arranged between any adjacent cathode foils or anode foils.

[0042] In some embodiments, it is provided that the separating film can be arranged continuously and stacked between any adjacent cathode foils or anode foils.

[0043] In some embodiments, the shape of the electrode arrangement can be cylindrical, flat, polygonal, or the like.

[0044] In some embodiments, the electrode arrangement is provided with a tab that allows current to be drawn from the electrode arrangement. The tab comprises a cathode tab and an anode tab.

[0045] In the present disclosure, the oil-based adhesive layer and the ceramic coating can be distinguished by observing their morphology under a scanning electron microscope (SEM). In the oil-based adhesive layer, the adhesive material dissolves in the oil-based solvent, and its molecular chains are exposed, revealing a porous network structure under the scanning electron microscope. In the ceramic coating, the ceramic material is present in particulate form in the oil-based solvent. The underlying granular ceramic coating is visible through the porous structure of the oil-based adhesive layer in the scanning electron microscope image of the release film.

[0046] Fig. Figure 1 schematically shows a structural representation of the separating film in a battery cell according to an embodiment of the present disclosure. As in Fig.As shown in Figure 1, the separating film 100 comprises a base film 10 and a coating 20 arranged on both sides of the base film 10, the coating 20 comprising a ceramic coating 201 and an oil-based adhesive layer 202, the ceramic coating 201 being arranged between the separating film 10 and the oil-based adhesive layer 202.

[0047] It should be noted that Fig. Figure 1 shows an exemplary schematic structural representation of the separating film 100, the ceramic coating 201 and the oil-based adhesive layer 202; in reality, there is no clear dividing line between the ceramic coating 201 and the oil-based adhesive layer 202, and the ceramic coating 201 and the oil-based adhesive layer 202 overlap in the thickness direction.

[0048] In some embodiments, the thickness of the one-sided coating is specified as being between 1 µm and 2.5 µm. This results in a more suitable range for the adhesion strength between the separating film and the electrode foil, as well as for the electrolyte solution retention capacity of the battery cell, which in turn contributes to improved cycle performance and safety performance of the battery cell.

[0049] For example, the thickness of the one-sided coating is 1 µm, 1.2 µm, 1.5 µm, 1.8 µm, 2 µm, 2.2 µm, 2.5 µm, 2.8 µm, 3 µm or a value within a range of any two values.

[0050] In this disclosure, the thickness of the coating in the release film can be measured using a method commonly used in this field. For example, the release film sample to be tested is adhered to the sample stage, and then the sample stage is inserted into the vacuum sample chamber and fixed there. The argon-ion cross-section polisher (e.g., the IB-09010 CP argon-ion cross-section polisher from JEOL Corporation, Japan) is switched on and vacuum-sealed (e.g., to 10). -7The argon flow rate (e.g., 0.12 MPa) and polishing time (e.g., 90 min) are set, the sample stage is set to swivel mode, and the polishing process is started. After polishing, the cross-section of the release film is examined using a scanning electron microscope. Since the base film has numerous pores, the base film and the coating can be distinguished in the cross-section of the release film, and the coating thickness can be determined using the measurement software integrated into the scanning electron microscope.

[0051] In some embodiments, the thickness of the separating film is specified as 9 µm to 13 µm, optionally also 11 µm. Therefore, a thicker separating film can further improve its strength, contributing to an increase in the puncture resistance of the separating film, which in turn improves the safety performance of the battery cells. For example, the thickness of the separating film is 9 µm, 9.5 µm, 10 µm, 10.5 µm, 11 µm, 11.5 µm, 12 µm, 12.5 µm, 13 µm, or a value within any two such values.

[0052] In this disclosure, the thickness of the separating film is measured using methods common in this field, for example with a micrometer.

[0053] In some embodiments, the thickness of the base film is specified as being between 3 µm and 7 µm. This contributes to improving the safety performance of the battery cells. For example, the thickness of the base film may be 3 µm, 4 µm, 5 µm, 6 µm, 7 µm, or a value within any two such values.

[0054] In some embodiments, the coating weight of a single-sided coating is provided for to be 2 mg / 1540.25 mm². 2 up to 4.5 mg / 1540.25 mm 2 , optionally also 2.5 mg / 1540.25 mm 2 up to 3.5 mg / 1540.25 mm 2 This allows for further improvements in the cycle performance and safety performance of the battery cells. For example, the coating weight of the single-sided coating is 2 mg / 1540.25 mm². 2 , 2.2 mg / 1540.25 mm 2 , 2.5 mg / 1540.25 mm 2 , 2.8 mg / 1540.25 mm 2 , 3 mg / 1540.25 mm 2 , 3.2 mg / 1540.25 mm 2, 3.5 mg / 1540.25 mm 2 , 3.8 mg / 1540.25 mm 2 , 4 mg / 1540.25 mm 2 , 4.2 mg / 1540.25 mm 2 , 4.5 mg / 1540.25 mm 2 or a value within a range of any two such values.

[0055] This disclosure describes the determination of the coating weight of a one-sided coating using methods commonly used in this field. For example, a separating film removed from an electrode assembly can be cut to a specific size and used as the separating film under test. Its weight is measured and designated M1. The separating film under test is then immersed in an N-methylpyrrolidone (NMP) solution and ultrasonically treated for 60 minutes at 60 °C to remove the coating on the separating film. After drying, the weight of the separating film under test (i.e., the base film) after coating removal is measured and recorded as M2. The coating weight of the one-sided coating is then calculated using the formula: Coating weight of the one-sided coating = (M1 - M2) / 2.

[0056] In some embodiments, the oil-based adhesive layer comprises an adhesive material containing one or more polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene copolymers; optionally, the adhesive material includes polyvinylidene fluoride (PVDF). Since the adhesive material dissolves in the oil-based solvent, its molecular chains are in an open state, resulting in improved adhesion. An oil-based adhesive layer using this adhesive material can enhance the adhesion between the separator film and the cathode foil, as well as between the separator film and the anode foil. This allows for a more complete contact between the electrode foil and the separator film, thereby improving the cycle performance and safety of the battery cell.

[0057] This disclosure does not impose any particular limitation on the weight-average molecular weight of the “adhesive material” as long as the purpose of this disclosure can be achieved. For example, the weight-average molecular weight of the adhesive material may be between 1.5 × 10 4 and 9 × 10 6 lay.

[0058] The adhesive material may, for example, but not exclusively, include at least one of the following materials: KYNAR PVDF lithium-ion battery binder (Kynar761A), PVDF5130 or HSV900; the models for Kynar 761A may, for example, but not exclusively, include HSV761, HSV761A, HSV301F, HSV2801, HSVLBG and the like.

[0059] The adhesive material exists in different forms in water-based and oil-based solvents. For example, polyvinylidene fluoride is insoluble in water-based solvents but disperses in them in particulate form, thus existing as particles in water-based solvents. Polyvinylidene fluoride (PVDF) has a similar polarity to oil-based solvents and is soluble in them. As a result, the molecular chains of PVDF open in oil-based solvents, and the adhesive material forms a porous network structure. With this disclosure, it is possible to determine whether the adhesive material is water-based or oil-based by observing its morphology under a scanning electron microscope (SEM).

[0060] In some embodiments, the ceramic coating comprises the ceramic material, which includes one or more of the following: aluminum oxide, boehmite, silicon dioxide, magnesium oxide, titanium dioxide, tin oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, aluminum hydroxide, magnesium hydroxide, and calcium hydroxide; optionally, the ceramic material may also include aluminum oxide. The aforementioned material, as a ceramic coating, can further improve the wettability of the electrolyte solution and promote its transport. This helps to reduce interfacial problems between the cathode and anode foils caused by insufficient electrolyte solution, thereby further improving the cycle performance of the battery cell.

[0061] In this disclosure, the specific materials of the oil-based adhesive layer and the ceramic coating are examined using the following methods: the separating film removed from the electrode assembly is examined by infrared spectroscopy; the adhesive material in the oil-based adhesive layer is determined by identifying the characteristic peaks in the coating. Additionally, the separating film is immersed in N-methylpyrrolidone (NMP) solvent and ultrasonically treated for 60 minutes at 60 °C to remove the coating on the separating film; the coating material is then collected and subjected to X-ray diffraction. Since the adhesive material in the coating is an organic material, it showed no diffraction peaks in the XRD pattern.Therefore, the presence of ceramic material can be determined by identifying the spectral patterns of the ceramic material based on XRD test results of coating material.

[0062] In some embodiments, the average particle size of the ceramic material is specified as being between 0.2 µm and 0.8 µm; optionally between 0.3 µm and 0.6 µm. Controlling the average particle size of the ceramic material within the aforementioned range is advantageous for improving the electrolyte solution retention capacity of the separating film, which in turn further improves lithium precipitation and thus increases the cycle life and safety performance of the battery cells. For example, the average particle size of the ceramic material may be 0.2 µm, 0.3 µm, 0.4 µm, 0.5 µm, 0.6 µm, 0.7 µm, 0.8 µm, or a value within any two such ranges.

[0063] This disclosure does not impose any special restrictions on the manufacturing process of the release film, as long as the purpose of this disclosure can be achieved. The manufacturing process of the release film includes, for example, but is not limited to, the following steps: the aforementioned ceramic material and adhesive material are each dispersed in an oil-based solvent to form a ceramic slurry, respectively.to form an adhesive slurry; the ceramic slurry is applied to both sides of the base film to form a ceramic coating; the adhesive slurry is applied to the surface of the ceramic coating to create an initial oil-based adhesive layer; the ceramic coating and the initial oil-based adhesive layer form the initial coating; after drying, an initial release film is formed; optionally, the ceramic slurry can be applied to the surface of the base film by a gravure coating process; the adhesive slurry can be applied to the surface of the ceramic coating by a gravure coating process or a spraying process to form an initial oil-based adhesive layer.The initial separating film is then assembled with the cathode foil and anode foil to form a stacked electrode assembly. This stacked assembly is then hot-pressed, causing the adhesive material in the initial oil-based adhesive layer to melt and reduce its thickness, thus forming an oil-based adhesive layer. The coating consists of an oil-based adhesive layer and a ceramic coating, which together form a separating film.

[0064] In some embodiments, it is provided that the hot pressing of the stacked electrode arrangement is maintained at 0.5 MPa to 3 MPa and 90 °C to 120 °C for 10 s to 90 s.

[0065] In some embodiments, the oil-based solvent comprises one or more of N-methylpyrrolidone (NMP), dimethylacetamide (DMAC), dimethyl sulfoxide (DMSO), cyclohexanone and acetone; optionally, the oil-based solvent may also include N-methylpyrrolidone.

[0066] In some embodiments, the mass ratio of ceramic material to adhesive material is (4:6) to (6:4); optionally, the ratio can also be 5:5.

[0067] In some embodiments, the coating slurry may also include a thickening agent. This helps to increase the stability of the coating slurry and to prevent the deposition of components within it. This disclosure does not impose any specific restrictions regarding the type of thickening agent, as long as it achieves the purpose of this disclosure. For example, at least one of the following substances may be selected as the thickening agent: hydroxyethylcellulose, methylhydroxyethylcellulose, sodium carboxymethylcellulose, polyacrylamide, or sodium alginate. This disclosure does not impose any specific restrictions regarding the thickening agent content in the oil-based adhesive layer; those skilled in the art may choose the content as required, as long as it achieves the purpose of this disclosure.

[0068] In some embodiments, the length-to-width ratio of the cathode foil and / or the anode foil is 4:5, optionally 4.3:4.8. By setting the length-to-width ratio of the cathode foil or anode foil within the aforementioned range, the internal heat dissipation rate of the electrode foil is maintained within a suitable range, thereby preventing heat buildup inside the battery cell. This prevents the SEI film from degrading and regenerating, further improving the cycle performance and safety of the battery cells. For example, the length-to-width ratio of the cathode foil and / or the anode foil may be 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, or a value within any two such values.

[0069] In this disclosure, by equipping the separating film with a double-sided ceramic coating and an oil-based adhesive layer, and by matching the cathode foil or the anode foil to a suitable length-to-width ratio, a closer contact of the electrode foils without internal heat accumulation is achieved, thereby effectively resolving the problem of contact failure at the interface between the electrode foils and the safety risks caused by heat build-up, resulting in better cycle performance and higher safety performance of the battery cells.

[0070] In this disclosure, the length-width ratio of the cathode foil and / or the anode foil is calculated by disassembling the battery cell and measuring the length and width of the cathode foil or anode foil.

[0071] In some embodiments, the compression density of the anode foil is provided for to be 1.4 g / cm³. 3 up to 1.6 g / cm³3 The density of the anode foil is within the range mentioned above, indicating a relatively high porosity. This can improve the wetting rate of the electrolyte solution in the anode foil, thereby increasing the kinetic performance of the electrode foil and reducing the risk of lithium precipitation. For example, the density of the anode foil is 1.4 g / cm³. 3 , 1.45 g / cm³ 3 , 1.5 g / cm³ 3 , 1.55 g / cm³ 3 , 1.6 g / cm³ 3 or a value within a range of any two such values.

[0072] In this disclosure, the density of the anode foil has a meaning known in this field and can be measured using instruments and methods known in this field. Density of the anode foil = areal density of the anode film layer / thickness of the anode film layer. The thickness of the anode film layer can be measured using instruments and methods known in this field, such as a micrometer (e.g., Mitutoyo 293-100 with an accuracy of 0.1 µm). The thickness is measured at at least 12 different points along the thickness direction of the anode foil, then the average value is taken as the thickness of the anode foil, and then the thickness of the anode current collector is subtracted to obtain the thickness of the anode film layer.The areal density of the anode film layer can be measured using known instruments and methods. For example, the electrode foil obtained after cold pressing or disassembly of the battery (if it is a double-sided coated electrode foil, the anode film layer is first wiped off one side) can be cut into small slices with an area S1, weighed, and recorded as M1. Then, the anode film layer is wiped off the weighed electrode foil, the anode current collector is weighed, and this is recorded as M0. The areal density of the anode film layer = (M1 - M0) / S1.

[0073] In some embodiments, the anode foil comprises an anode current collector and an anode film layer located on at least one side of the anode current collector, comprising an active anode material. The active anode material comprises graphite material, wherein the volumetric particle size distribution Dv50 of the graphite material is 15 µm to 22 µm; optionally, the volumetric particle size distribution Dv50 of the graphite material is 18 µm to 21 µm. The volumetric particle size distribution Dv50 of the graphite material lies within the aforementioned range, indicating a larger particle size of the graphite material. Graphite with a larger particle size exhibits a more uniform volume change during lithium insertion and extraction, and the internal stresses of the particles are better distributed. This can reduce the risk of graphite cracking and pulverization during long-term cycles and improve cycle performance.For example, the volumetric particle size distribution Dv50 of the graphite material lies between 15 µm, 16 µm, 17 µm, 18 µm, 19 µm, 20 µm, 21 µm, 22 µm or at a value within a range of any two such values.

[0074] In this disclosure, the volumetric particle size distribution Dv50 of the graphite material is the particle size corresponding to a cumulative volume distribution percentage of 50% for the graphite material and which can be measured using instruments and methods known in this field. The determination can be carried out, for example, using a laser particle size analyzer in accordance with standard GB / T 19077-2016. The Mastersizer 3000 laser particle size analyzer from Malvern Instruments Ltd., UK, can be used as the testing device.

[0075] In some embodiments, the specific surface area of ​​the graphite material is in the range of 0.5 m². 2 / g up to 2 m 2The graphite material therefore has a smaller specific surface area and fewer active sites in contact with the electrolyte solution, which can reduce side reactions (such as gas formation and lithium precipitation) during the cycle and thus improve the cycle performance and safety of the battery cells. The specific surface area of ​​the graphite material is, for example, between 0.5 m². 2 / g, 1.0 m 2 / g, 1.2 m 2 / g, 1.5 m 2 / g, 1.6 m 2 / g, 1.8 m 2 / g, 2.0 m 2 / g or a value within a range of any two such values.

[0076] In this disclosure, the term "specific surface area" has a meaning known in this field and can be determined by tests using instruments or methods known in this field. Specifically, the powder of the anode film layer is scraped off as the sample to be tested, and then the specific surface area of ​​the sample is determined by gas adsorption, specifically with reference to standard GB / T19587-2017, and calculated according to the BET (Brunauer-Emmett Teller) method. The Tri-Star 3020 specific surface area and pore size analyzer from Micromeritics, Inc., can be used as the testing instrument.

[0077] In some embodiments, the one-sided coating weight of the anode film layer is 160 mg / 1540.25 mm². 2 up to 200mg / 1540.25 mm 2The one-sided coating mass of the anode film layer lies within the aforementioned range, thus ensuring that the porosity of the anode film layer is within a suitable range and further improving the cycle performance of the battery cell. For example, the coating mass of the anode film layer is 160 mg / 1540.25 mm². 2 , 170 mg / 1540.25 mm 2 , 180 mg / 1540.25 mm 2 , 190 mg / 1540.25 mm 2 , 200 mg / 1540.25 mm 2 or a value within a range of any two such values.

[0078] In some embodiments, the anode film layer comprises a first active anode layer and a second active anode layer, with the second active anode layer positioned between the anode current collector and the first active anode layer. The density of the second active anode layer is greater than that of the first active anode layer. Therefore, the upper first active anode layer exhibits greater porosity, providing a smoother channel for lithium ion transport and rapidly improving lithium ion insertion / extraction kinetics. This reduces the risk of lithium precipitation within the battery cell and thus contributes to improved safety performance and cycle life. Furthermore, the lower second active anode layer has a high density, which positively impacts the energy density of the battery cell.

[0079] In some embodiments, the density of the first active anode layer is specified as 1.35 g / cm³. 3 up to 1.5 g / cm³ 3 This facilitates the deintercalation of lithium ions, reduces the risk of lithium deposition in battery cells, and thus improves the cycle performance and safety of battery cells. For example, the density of the first active anode layer is 1.35 g / cm³. 3 , 1.4g / cm³ 3 , 1.45g / cm³ 3 , 1.5g / cm³ 3 or a value within a range of any two such values.

[0080] In some embodiments, the density of the second active anode layer is provided for to be 1.5 g / cm³. 3 up to 1.75g / cm³ 3 This contributes to improving the energy density of the battery cell. For example, the density of the second active anode layer is 1.5 g / cm³.3 , 1.55g / cm³ 3 , 1.6g / cm³ 3 , 1.65g / cm³ 3 , 1.7g / cm³ 3 , 1.75g / cm³ 3 or a value within a range of any two such values.

[0081] In some embodiments, the first active anode layer and the second active anode layer each comprise a graphite material, wherein the mass ratio of the graphite material in the first active anode layer and the second active anode layer is between 4:6 and 6:4. Having the mass ratio of the graphite material within the aforementioned range is advantageous for achieving a balance between the safety performance, cycle life, and energy density of the battery cells. For example, the mass ratio of the graphite material in the first active anode layer and the second active anode layer may be between 4:6, 4.5:5.5, 5:5, 5.5:4.5, 6:4, or a value within any two such ranges.

[0082] In some embodiments, the graphite material in the first active anode layer and the second active anode layer is the graphite material described in the embodiments above, with a volumetric particle size distribution Dv50 of 15 µm to 22 µm and a specific surface area of ​​0.5 m². 2 / g up to 2m 2 / g, or it can be another graphite material. Optionally, the graphite material in the first active anode layer and the second active anode layer is the graphite material described in the embodiments above, with a volumetric particle size distribution Dv50 of 15 µm to 22 µm and a specific surface area of ​​0.5 m². 2 / g up to 2m 2 / g, or it could be other graphite materials.

[0083] In some embodiments, it is provided that the battery cell can be a secondary battery, meaning a battery cell that can be recharged after discharge to activate the active material and can be used further.

[0084] For example, the battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery or the like, and the embodiments of the present disclosure are not limited by this.

[0085] In some embodiments, the battery cell comprises a housing and an electrode assembly. The housing is the outer protective shell of the battery cell, and an internal chamber is formed to encapsulate components such as the electrode assembly and electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (for example, made of polypropylene), a metal composite shell (for example, a copper-aluminum composite shell), an aluminum-plastic film, or the like.

[0086] In some embodiments, the electrode assembly is a component within the battery cell where electrochemical reactions take place. The electrode assembly is typically stacked along the thickness direction (stacking direction) of the battery cell. The electrode assembly comprises a cathode foil, an anode foil, and a separator film. During the charging and discharging process of the battery cell, active ions (such as ions) are inserted into and removed from between the cathode foil and the anode foil. The separator film is placed between the cathode foil and the anode foil, preventing a short circuit between them while allowing the passage of active ions.

[0087] In some embodiments, the cathode foil may comprise a cathode current collector and an active cathode material arranged on at least one surface of the cathode current collector.

[0088] For example, the cathode current collector has two surfaces opposite each other in its thickness direction, and the active cathode material is arranged on one or both of the two opposite surfaces of the cathode current collector.

[0089] For example, the cathode current collector can be a metal foil or a composite current collector. For example, aluminum or stainless steel with a silver surface treatment, copper, nickel, or titanium can be used as the metal foil. Composite current collectors can comprise a polymer base layer and a metal layer. The composite current collector can be formed by bonding a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, silver alloy, or the like) to a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0090] For example, the active cathode material can be a known active cathode material used in lithium-ion batteries. For instance, the active cathode material can comprise at least one of the following: lithium-containing phosphate with an olivine structure, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other conventional materials suitable for use as battery active cathode materials may also be employed. These active cathode materials can be used alone or in combination with one or more of them.Examples of lithium transition metal oxides can be at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0,5 Co 0,2 Mn 0,3 O2 (also known as NCM523), LiNi 0,5 Co 0,25 Mn 0,25 O2 (also known as NCM211), LiNi 0,6 Co 0,2 Mn 0,2 O2 (also known as NCM622), LiNi 0,8 Co 0,1 Mn 0,1 O2 (also known as NCM811) and lithium nickel cobalt aluminum oxides (such as LiNi) 0,85 Co 0,10 Al 0,05Examples of lithium-containing phosphate with an olivine structure may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (also known as LFP)), lithium iron phosphate carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate carbon composites.

[0091] In the present disclosure, deintercalation and consumption of lithium occur during the charging and discharging process in the battery, and the molar content of lithium varies depending on how the battery is discharged. In the enumeration of the active cathode material in the present disclosure, the molar content of lithium represents the initial state of the material, i.e., the state before the addition of the active cathode material within the battery system, and the molar content of lithium changes after the charging and discharging cycle.

[0092] In the list of active cathode material in the present disclosure, the molar content of O is only a theoretical value. Due to the release of oxygen from the crystal lattice, the molar content of oxygen changes, and the actual molar content of O fluctuates.

[0093] In some embodiments, the cathode film layer may optionally also include a binder. For example, the binder may comprise at least one of the following: polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorine-containing acrylate resin.

[0094] In some embodiments, the cathode film layer may optionally also include a conductive material. For example, the conductive material may comprise at least one of the following: superconducting carbon, carbon black, carbon black, Ketjen carbon black, carbon dot, carbon nanotube, graphene, and carbon nanofiber.

[0095] In some embodiments, the cathode foil can be produced as follows: the above-mentioned components for producing the cathode foil, for example the active cathode material, the conductive agent, the binder and all other components, are dispersed in a solvent (e.g. N-methylpyrrolidone) to form a cathode slurry; the cathode slurry is applied to the cathode current collector and after processes such as drying and cold pressing, the cathode foil can be obtained.

[0096] In some embodiments, the anode foil comprises an anode current collector and an anode film layer located on at least one side of the anode current collector and comprising an active anode material.

[0097] For example, the anode current collector has two surfaces opposite each other in its thickness direction, and the active anode material is arranged on one or both of the two opposite surfaces of the anode current collector.

[0098] In some embodiments, the anode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, the metal foil can be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, nickel, carbon, or titanium. Composite current collectors can comprise a polymer base layer and a metal layer. The foamed metal can be, for example, foamed nickel, foamed copper, foamed aluminum, or foamed alloys. The composite current collector can be formed by forming a metal material (copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, or the like) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0099] In some embodiments, the anode film layer may optionally include a binder. The binder can be selected from one or more of the following: styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS).

[0100] In some embodiments, the anode film layer optionally includes a conductive material. The conductive material can be selected from one or more of the following: superconducting carbon, carbon black, carbon black, Ketjen carbon black, carbon dot, carbon nanotube, graphene, and carbon nanofiber.

[0101] In some embodiments, the anode film layer may optionally include other additives, such as a thickening agent (e.g. sodium carboxymethylcellulose (CMC-Na)).

[0102] In some embodiments, it is provided that the anode foil can be produced by the following method: Dispersing the above-mentioned components for the production of the anode foil, such as the active anode material, the conductive agent, the binder and all other components in a solvent (such as deionized water) to form an anode slurry; the anode slurry is applied to the anode current collector and after processes such as drying and cold pressing, the anode foil can be obtained.

[0103] The electrolyte conducts ions between the cathode foil and the anode foil. For the purposes of this disclosure, there are no particular restrictions regarding the type of electrolyte, which can be selected as required. For example, the electrolyte can be liquid, gel-like, or completely solid.

[0104] In some embodiments, the electrolyte is provided as an electrolyte solution. The electrolyte solution comprises an electrolyte salt and a solvent.

[0105] In some embodiments, it is provided that the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bistrifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorobisoxalatophosphate and lithium tetrafluorooxalate phosphate.

[0106] In some embodiments, it is provided that the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane sulfone, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone.

[0107] In some embodiments, the electrolyte solution optionally includes an additive. The additive may, for example, be an additive that forms the anode film and an additive that forms the cathode film, and may also include an additive that can improve certain battery properties, such as an additive that improves the battery's overcharge performance, an additive that improves the battery's performance at high or low temperatures, or the like.

[0108] In some embodiments, the electrical conductivity of the electrolyte is specified as being between 10 S / m and 15 S / m. Therefore, the electrolyte exhibits high conductivity, which promotes the transport of lithium ions and can reduce the formation of lithium precipitate on the surface of the anode foil. For example, the electrical conductivity of the electrolyte is between 10 S / m, 11 S / m, 12 S / m, 13 S / m, 14 S / m, 15 S / m, or at a value within any two such values.

[0109] In some embodiments, the battery cell may include an outer packaging. The outer packaging can be used to package the electrode assembly and the electrolyte.

[0110] In some embodiments, the outer packaging of the battery cell can be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, or the like. The outer packaging of the battery cell can also be a soft packaging, such as a bag-like soft packaging. The material of the soft packaging can be plastic, and examples of plastics include polypropylene, polybutylene terephthalate, and polybutylene succinate, among others.

[0111] The present disclosure is not subject to any particular restrictions regarding the shape of the battery cell, and it may be circular cylindrical, square or any other shape. Fig. Figure 2 shows, for example, a schematic representation of a battery cell according to an embodiment of the present disclosure, Fig. Figure 2 shows an example of a battery cell 5 with a square structure.

[0112] Fig.Figure 3 shows an exploded view of a battery cell according to an embodiment of the present disclosure, which is described in Fig. 2 is shown, with reference to Fig.3. The outer packaging can comprise a housing 51 and a cover assembly 53. The housing 51 can comprise a base plate and a side plate connected to the base plate, and the base plate and side plates enclose and form a receiving space. The housing 51 has an opening that communicates with the receiving space, and the cover assembly 53 can cover the opening to close the receiving space. An electrode assembly 52 can be produced from the cathode foil, the anode foil, and the separating film by a lamination process. The electrode assembly 52 is encapsulated in the receiving space. The electrolyte solution wets the electrode assembly 52. ​​The number of electrode assemblies 52 contained in the battery cell 5 can be one or more, and the person skilled in the art can select one according to the specific practical requirements. Battery device

[0113] A second aspect of the embodiments of the present disclosure provides a battery device that may include one or more battery cell arrangements for providing voltage and capacity. A battery cell arrangement may comprise several battery cells provided in the first aspect described above, which are connected in series, parallel, or in a mixed configuration via a bus component.

[0114] In some embodiments, it is provided that a battery cell arrangement is typically formed by the arrangement of several battery cells.

[0115] For example, the battery cell arrangement can be a battery module formed by arranging and securing several battery cells in an independent module. For instance, a battery module can be formed by bundling several battery cells with cable ties.

[0116] For example, the battery cell arrangement can be a battery module, and the battery cell arrangement can be incorporated into the housing by attaching the battery module to the housing.

[0117] For example, the battery cell arrangement can also be incorporated into the housing by attaching several battery cells directly to the housing.

[0118] For example, the housing can comprise a first housing and a second housing. The first and second housings are interlocked, and the interior of the housing forms a sealed space to accommodate the battery cell array. "Sealed" here means "covered" or "closed" and can be sealed or unsealed. The first housing can be a top cover or a bottom plate.

[0119] For example, the housing can comprise a top cover, a frame, and a base plate. The top cover and the base plate are each connected to the frame, so that the interior of the housing forms a sealed space to accommodate the battery cell assembly.

[0120] In some embodiments, the housing can be used as part of the vehicle's chassis structure. For example, part of the housing can become at least part of the vehicle's floor covering, or part of the housing can become at least part of a cross member and a longitudinal member of the vehicle.

[0121] In some embodiments, the battery device may be a battery pack comprising a housing and one or more battery cell assemblies contained within the housing.

[0122] The technical solutions described in the embodiments of the present disclosure are applicable to various power-consuming devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric motorcycles, electric toys, power tools, vehicles, ships and spacecraft, and the spacecraft include, for example, airplanes, rockets, spaceships and spacecraft.

[0123] Fig. Figure 4 is a schematic representation of a battery module according to an embodiment of the present disclosure, with reference to Fig. In battery module 4, several battery cells 5 can be arranged sequentially along the longitudinal direction of the battery module 4. Of course, the arrangement can also be any other way. The multiple battery cells 5 can additionally be secured by fastening elements.

[0124] Optionally, the battery module 4 can also include an outer shell with a receiving space, and the multiple battery cells 5 are received in the receiving space.

[0125] Fig. Figure 5 is a schematic representation of a battery pack according to an embodiment of the present disclosure, and Fig. Figure 6 is an exploded view of the battery pack according to an embodiment of the present disclosure, which is in Fig. 5 is shown, with reference to Fig. 5 and Fig. 6. The battery pack 1 can comprise a battery box and several battery modules 4 arranged within the battery box. The battery box comprises a first housing 2 and a second housing 3; the first housing 2 can cover the second housing 3 and form a sealed space for the battery module 4. The arrangement of the multiple battery modules 4 within the battery box is arbitrary. Power-consuming device

[0126] A third aspect of the embodiments of the present disclosure also relates to a power-consuming device, which is described below with reference to the accompanying drawings.

[0127] The power-consuming device mentioned in the embodiments of this disclosure comprises the battery device provided in the second part of this disclosure. The battery device can be used either as the power supply for the power-consuming device or as the energy storage unit for the power-consuming device. The power-consuming device may include, but is not limited to, mobile devices (e.g., mobile phones, laptops, and the like), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, and the like), electric trains, ships and satellites, energy storage systems, and the like.

[0128] Fig.Figure 7 is a schematic representation of a power-consuming device which, according to one embodiment of the present disclosure, uses the secondary battery as a power source. The power-consuming device is a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or the like. To meet the power-consuming device's requirements for high battery power and energy density, a battery pack or battery module can be used.

[0129] As another example, the device could be a mobile phone, a tablet computer, a laptop computer, or the like. The device typically needs to be lightweight and thin, and a battery cell can be used as the power source. Examples of implementation

[0130] The following are examples of embodiments of the present disclosure. These embodiments are exemplary and serve only to illustrate the present disclosure; they should not be construed as limiting it. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the technical literature or the product instructions must be followed. Any reagents or instruments used without manufacturer information are exclusively commercially available products. Example 1: Production of battery cells: 1) Production of the anode foil

[0131] Artificial graphite (Dv50 of 20 µm and specific surface area of ​​0.75m²) 2 / g) as the active anode material, lithium-ion carbon black powder (SP-Li) as the conductive agent, and polyvinyl alcohol as the binder are uniformly mixed in a weight ratio of 90:5:5 and dissolved in deionized water to obtain a negative anode slurry with a solids content of 45%. The anode slurry is applied to the surface of the copper foil of the anode current collector to a thickness of 8 µm and subsequently dried to form an anode film layer; the anode foil is then shaped by processes such as rolling and cutting; the one-sided coating weight of the anode film layer is 175 mg / 1540.25 mm². 2 , and the length-to-width ratio of the anode foil is 4.6. 2) Production of the cathode foil

[0132] The active cathode material LiFePO4, the conductive carbon black (as the conductive cathode medium), and the binder PVDF are uniformly mixed in a weight ratio of 98:1:1 and dissolved in the solvent N-methylpyrrolidone to obtain a cathode slurry with a solids content of 56%. This cathode slurry is applied to both sides of the 11 µm thick aluminum foil of the cathode current collector to form the cathode film layer. After drying, cold pressing, and cutting, the cathode foil is obtained. The single-sided coating mass of the cathode film layer is 384 mg / 1540.25 mm². 2 , and the length-to-width ratio of the cathode foil is 4.6. 3) Production of the initial release film

[0133] A 7 µm thick polyethylene film is used as the base film for the release film. 1.75 mg each of aluminum oxide powder (as the ceramic material) and polyvinylidene fluoride (PVDF) (as the adhesive material) are separately added to an oil-based solvent (NMP) and thoroughly mixed to produce the ceramic slurry and the adhesive slurry, respectively. The ceramic slurry is then applied to both sides of the base film by intaglio printing to form a ceramic coating. Subsequently, an adhesive slurry is sprayed onto the surface of the ceramic coating to form an initial oil-based adhesive layer. The ceramic coating and the initial oil-based adhesive layer together constitute the initial coating. The coating weight of the one-sided initial coating is 3.5 mg / 1540.25 mm². 2 , the initial separating film is retained after drying. 4) Preparation of the electrolyte solution

[0134] Ethylene carbonate, diethyl carbonate and dimethyl carbonate are mixed in a volume ratio of 1:1:1 to form an organic solvent; lithium hexafluorophosphate and lithium bis(trifluoromethanesulfonyl)imide are dissolved in a mass ratio of 7:3 in this organic solvent to prepare an electrolyte solution with a concentration of 1 mol / L and an electrical conductivity of 11 S / m. 5) Production of battery cells

[0135] The cut cathode foil, the initial separator film, and the anode foil are stacked using a Z-shaped stacking method, with the stacking sequence being "cathode foil - initial separator film - anode foil - initial separator film" to form a stacked electrode assembly. Subsequently, the stacked electrode assembly is hot-pressed for 60 seconds at 2 MPa and 100 °C. The hot-pressed stacked electrode assembly is then placed in an aluminum-plastic film and an airtight package is formed by liquid injection, vacuum sealing, and hot-press sealing, ultimately creating a single battery cell.During the hot pressing process of the stacked electrode assembly, the polyvinylidene fluoride in the initial oil-based adhesive layer melts upon heating, transforming the initial oil-based adhesive layer into an oil-based adhesive layer and forming the initial separator film into a separator film. In the final battery cell, the thickness of the one-sided coating of the separator film is 2 µm, and the total thickness of the separator film is 11 µm. Characterization of the battery cell: (1) Scanning electron microscopy (SEM) examination of the separating film

[0136] The microstructure of the release film is determined by scanning and testing with a scanning electron microscope (SEM) (ZEISS Sigma300 model, acceleration voltage 3 kV, magnification 5000x). The testing process is as follows: the release film is cut into samples of a specific size (e.g., 2 cm x 2 cm) and fixed to the sample stage with paraffin. The sample stage is then inserted into the sample holder, locked, and secured. The argon-ion cross-section polisher (IB-19500CP) is switched on and evacuated (104 Pa). The argon flow rate (0.15 MPa), voltage (8 kV), and polishing time (2 hours) are set. The sample stage is set to swivel mode, and the polishing process is started. After polishing, tests can be performed according to JY / T010-1996. To ensure the accuracy of the test results, several (e.g. 10) different areas of the sample to be tested can be randomly selected for scanning.

[0137] Based on the examined scanning electron microscope images, a schematic structural representation of the cross-section of the separating film in embodiment 1 is created along the thickness direction, as shown in Fig. Figure 8 shows that the separating film in embodiment 1 comprises a base film 10, a ceramic coating 201 and an oil-based adhesive layer 202, the ceramic coating 201 is granular, the oil-based adhesive layer 202 has a porous network structure or a similar porous sponge structure. (2) Compression density test for the anode foil

[0138] After disassembling the battery cell, the anode foil is removed (in the case of a double-sided coated anode foil, the anode film layer is first wiped off one side). Using a micrometer (Mitutoyo 293-100, accuracy 0.1 µm), the thickness of the anode foil is measured at at least twelve different points in the thickness direction. The average value is then taken as the thickness of the anode foil, and the thickness of the anode current collector is subsequently subtracted to obtain the thickness of the anode film layer. The aforementioned anode foil is then punched out into a small disc with area S1, the weight of which is recorded as M1. Next, the anode film layer is wiped off the weighed anode foil, and the weight of the anode current collector is measured and recorded as M0.The areal density of the anode film layer = (M1 - M0) / S1; subsequently, the compaction density of the anode foil is calculated using the formula: Compaction density = areal density of the anode film layer / thickness of the anode film layer.

[0139] After measurement and calculation, the compaction density of the anode foil in embodiment 1 is 1.5 g / cm³. 3 . Battery cell performance test: (1) Cyclic performance test

[0140] At 25 °C, the battery cell is charged to 4.3 V with a constant current of 0.01 C, then charged to a reverse current of 0.04 C with a constant voltage of 4.3 V, left to rest for 5 minutes, and then discharged to 2.8 V with a constant current of 0.01 C. It is left to rest for another 5 minutes. This is one charge and discharge cycle. After three repetitions, the discharge capacity at that point is recorded as C0. The battery cell is then charged to 4.3 V at 25 °C with a constant current of 0.33 C0, then discharged to a reverse current of 0.04 C0 with a constant voltage of 4.3 V, left to rest for 50 minutes, and then discharged to 2.8 V with a constant current of 0.33 C0. After a rest period of 5 minutes, this charge and discharge cycle is repeated for the battery cell, and the discharge capacity C is recorded. n of the 1000th cycle recorded.

[0141] The cycle capacity retention rate of a battery cell after 1000 cycles is expressed as (C n / C0) * 100% calculated, and the test results are listed in Table 2 below. (2) Security performance test

[0142] At 25 °C, the battery cell, which has undergone 1000 charge cycles, is fully charged to 100% state of charge (SOC), left to rest for 2 hours, and then the initial open-circuit voltage OCV1 of the battery cell is measured. Afterward, the battery cell is left to rest for another 24 hours, and the open-circuit voltage is measured as OCV2; k-value = (OCV1-OCV2) / 24h. The test results are listed in Table 2 below. Examples 2 to 6

[0143] The battery cell is manufactured using the same method as in embodiment 1, however, the relevant parameters of the separating film and the anode foil in the battery cell are adjusted according to Table 1 below. Comparative example 1

[0144] The battery cell is manufactured according to the same method as in embodiment 1, except that the coating slurry used for the manufacturing process of the separating film did not contain PVDF, so that the manufactured coating comprises only a ceramic coating. Comparative example 2

[0145] The battery cell is manufactured according to the same procedure as in embodiment 1, except that the coating slurry used for the manufacturing process of the separating film did not contain aluminium oxide powder, so that the manufactured coating comprises only an oil-based adhesive layer. Comparative example 3

[0146] The battery cell was manufactured according to the same procedure as in embodiment 1, except that the manufacturing process of the coating material in the separating film was carried out as follows: Aluminum oxide powder as a ceramic material and polyvinylidene fluoride (PVDF) as an adhesive material are added to deionized water as an aqueous solvent in a weight ratio of 1:1 and mixed uniformly to form a coating slurry; this coating slurry is then applied to both sides of the base film of the separating film to form a ceramic coating and a water-based adhesive layer.

[0147] The separating film in comparative example 3 is examined using scanning electron microscopy (SEM) in the same way as in embodiment 1. Based on the obtained scanning electron microscope images, a schematic structural representation of the cross-section of the separating film in comparative example 3 is created along the thickness direction, as shown in Fig. As shown in Figure 9, the separating film in comparative example 3 comprises a base film 10, a ceramic coating 201 and a water-based adhesive layer 30; both the ceramic coating 201 and the water-based adhesive layer 30 are granular.

[0148] It should be noted that the Fig. 8 and Fig.9. The schematic structural representations of the release film in embodiment 1 and comparative example 3 illustrate, by way of example, the difference between the oil-based binder 202 and the water-based adhesive layer 30. The shapes, sizes, and spacings of the particles in the individual layers of the figure are simplified representations and do not reflect the exact proportions of the actual product. Similarly, the patterns, shadows, or particle densities in the figure serve only to differentiate structural applications and do not reflect the actual density or porosity of the coating or other microstructures. Comparative example 4

[0149] The battery cells are manufactured using the same method as in embodiment 1, except that in the manufacturing process of the separating film the coating was applied only to one side of the base film. Comparative example 5

[0150] The battery cells are manufactured according to the same method as in embodiment 1, except that the coating weight of the one-sided coating is reduced to 1 mg / 1540.25 mm². 2 This is controlled, resulting in a thickness of the one-sided coating of 0.5 µm and a total thickness of the separating film of 8 µm. Comparative example 6

[0151] The battery cells are manufactured according to the same method as in embodiment 1, except that the coating weight of the one-sided coating is reduced to 6 mg / 1540.25 mm². 2 This is controlled, resulting in a thickness of the one-sided coating of 4 µm and a total thickness of the separating film of 15 µm.

[0152] The performance test is carried out for the battery cells produced in embodiments 2 to 6 and comparative examples 1 to 6 using the same test procedures as in embodiment 1. Table 2 below shows the results of the performance test of the battery cells produced in embodiments 1 to 6 and comparative examples 1 to 6. Table 1 registration Release film Anode foil Coating material Coating positions of the coating Base film thickness (µm) Thickness of one-sided coating (µm) Total thickness (µm) Coating weight of the one-sided coating (mg / mm²) 2 ) Compaction density (g / cm³) 3 ) Example 1 Aluminum oxide + oil-based PVDF double-sided 7 2 11 3,5 1,5 Example 2 Aluminum oxide + oil-based PVDF double-sided 7 1 9 2 1,5 Example 3 Aluminum oxide + oil-based PVDF double-sided 7 3 13 4,5 1,5 Example 4 Alumina +Polyvinylidene Fluoride-Hexafluoropropylene Copolymer double-sided 7 2 11 3,5 1,5 Example 5 boehmite + oil-based PVDF double-sided 7 2 11 3,5 1,5 Example 6 Aluminum oxide + oil-based PVDF double-sided 7 2 11 3,5 1,7 Comparative example 1 Aluminum oxide double-sided 7 2 11 4 1,5 Comparative example 2 oil-based PVDF double-sided 7 2 11 1,5 1,5 Comparative example 3 Aluminium oxide + water-based PVDF double-sided 7 2 11 3,5 1,5 Comparative example 4 Aluminum oxide + oil-based PVDF one-sided 7 2 9 3,5 1,5 Comparative example 5 Aluminum oxide + oil-based PVDF double-sided 7 0,5 8 1 1,5 Comparative example 6 Aluminum oxide + oil-based PVDF double-sided 7 4 15 6 1,5 Table 2 registration Battery cell performance test k-value (mV / h) Capacity retention rate (%) after 1000 cycles at 25°C Example 1 0,05 92,5 Example 2 0,11 90,5 Example 3 0,05 90,2 Example 4 0,05 91,2 Example 5 0,09 89,8 Example 6 0,16 88,5 Comparative example 1 0,25 85,5 Comparative example 2 0,31 84,8 Comparative example 3 0,20 86,6 Comparative example 4 0,39 84,1 Comparative example 5 0,22 86,8 Comparative example 6 0,03 84,5

[0153] As shown in Tables 1 and 2, in embodiments 1-6, providing a separating film with a double-sided ceramic coating and an oil-based adhesive layer with a single-sided coating thickness of 1 µm to 3 µm significantly improves lithium precipitation and the cycle performance of the battery cells. The separating film in comparative example 1 comprises only a ceramic coating. Due to the low adhesion of the separating film, contact defects can easily occur at the electrode foil interface, which in turn leads to lithium deposits in the battery cell and thus impairs the safety performance and cycle performance of the battery cell.The separating film of comparison example 2 comprises only an oil-based adhesive layer, which has poor electrolyte solution retention capacity and also leads to lithium precipitation, impairing the safety performance and cycle performance of the battery cells; the separating film of comparison example 3 comprises a ceramic coating and a water-based adhesive layer, its adhesion is relatively low compared to the oil-based adhesive layer, the volume expansion during the charging and discharging process can easily lead to separation between the electrode foil layers, resulting in lithium precipitation in the battery cell and thus impairing the safety performance and cycle stability of the battery cell;The separator film in comparative example 4 comprises only a single-sided coating and has low strength; lithium dendrites can penetrate the separator film more easily, leading to battery cell failures and thus impairing the safety and cycle performance of the battery cells; the thickness of the single-sided coating of the separator film in comparative example 5 is relatively small, and the strength of the separator film is also low, which impairs the safety and cycle performance of the battery cells; the single-sided coating of the separator film in comparative example 6 has a greater thickness, making it more difficult for lithium dendrites to penetrate the separator film and thus achieving higher safety performance; however, the greater thickness impairs the dynamic behavior and leads to lower cycle performance of the battery cells. Examples 7 to 13

[0154] The battery cell is manufactured using the same method as in embodiment 1, however, the relevant parameters of the separating film, the cathode foil and the anode foil in the battery cell are adjusted according to Table 3 below.

[0155] The performance test for the battery cells produced in embodiments 7 to 13 is carried out using the same test procedures as in embodiment 1. Table 4 below shows the results of the performance test for the battery cells produced in embodiments 7 to 13. For better comparability, the relevant parameters from embodiment 1 are also listed. Table 3 registration Release film Length-to-width ratio of the cathode foil to the anode foil Graphite material Coating material Coating positions of the coating Thickness of one-sided coating (µm) Total thickness (µm) Dv50(µm) Specific surface area (m²) 2 / kg) Example 1 Aluminium oxide + oil-based PVDF double-sided 2 11 4,6 20 0,75 Example 7 Aluminium oxide + oil-based PVDF double-sided 2 11 4,6 15 1,4 Example 8 Aluminium oxide + oil-based PVDF double-sided 2 11 4,6 10 2,3 Example 9 Aluminium oxide + oil-based PVDF double-sided 2 11 4,6 25 0,48 Example 10 Aluminium oxide + oil-based PVDF double-sided 2 11 4 20 0,75 Example 11 Aluminium oxide + oil-based PVDF double-sided 2 11 5 20 0,75 Example 12 Aluminium oxide + oil-based PVDF double-sided 2 11 3 20 0,75 Example 13 Aluminium oxide + oil-based PVDF double-sided 2 11 6 20 0,75 Table 4 registration Battery cell performance test k-value (mV / h) Capacity retention rate (%) after 1000 cycles at 25°C Example 1 0,05 92,5 Example 7 0,09 90,9 Example 8 0,16 89,5 Example 9 0,14 88,2 Example 10 0,09 92,1 Example 11 0,08 91,8 Example 12 0,12 90,4 Example 13 0,17 89,3

[0156] As shown in Tables 3 and 4, adjusting the Dv50 of the graphite material to a value between 15 µm and 22 µm and the length-to-width ratio of the cathode foil to the anode foil to a value between 4 and 5 can improve lithium precipitation and the cycle performance of the battery cell. The graphite material in embodiment 8 has a smaller Dv50 value and a larger specific surface area, making it more susceptible to side reactions, which impairs the cycle performance of the battery cells.The graphite material in embodiment 9 has a high Dv50 and a low specific surface area, resulting in a longer transport path for lithium ions. This impairs the insertion / extraction rate of the lithium ions and prevents them from being incorporated into the graphite in a timely manner, causing lithium precipitation. This negatively impacts the safety performance and cycle performance of the battery cells. The electrode foil in embodiment 12 has a small length-to-width ratio, resulting in a low internal heat dissipation rate of the electrode foil and thus internal heat accumulation in the battery cell. This negatively impacts the safety performance and cycle performance of the battery cells.In embodiment 13, the electrode foil has a large length-to-width ratio, which leads to an uneven current distribution across the electrode foil and a tendency to local heat accumulation; this impairs the safety performance and the cycle performance of the battery cells. Example 14

[0157] The battery cells are manufactured according to the same method as in embodiment 1, except that the anode foil is manufactured according to the following method:

[0158] Using the same anode slurry as in embodiment 1, the anode slurry is first applied to the surface of the copper foil of the anode current collector with a thickness of 8 µm, then dried and rolled for the first time to form the second active anode layer. The aforementioned anode slurry is then applied to the surface of the second active anode layer, and after drying and a second rolling process, the first active anode layer is formed, resulting in an anode foil comprising a first active anode layer and a second active anode layer. The pressure of the first rolling process is 110 t, and the rolling speed is 60 m / min. The pressure of the second rolling process is 90 t, and the rolling speed is 50 m / min. The compaction density of the first active anode layer in the produced anode foil is 1.4 g / cm³. 3, where the density of the second active anode layer is 1.6 g / cm³ 3 The coating weight of the first active anode material layer is 87.5 mg / 1540.25 mm². 2 The coating weight of the second active anode material layer is 87.5 mg / 1540.25 mm². 2 , wherein the mass ratio of the graphite material in the first active anode layer and the second active anode layer is 1:1. Examples 15 to 18

[0159] The battery cells are manufactured according to the same procedure as in embodiment 14, however, the parameters of the first and second active anode layers are adjusted according to Table 5 below.

[0160] The performance test is carried out for the battery cells produced in embodiments 14 to 18 using the same test procedures as in embodiment 1. Table 6 below shows the results of the performance test of the battery cells produced in embodiments 14 to 18. For better comparison, the relevant parameters from embodiment 1 are also shown here. Table 5 registration Is the anode coated with a double layer? First active anode layer Second active anode layer Mass ratio of the graphite material in the first active anode layer and the second active anode layer Compaction density (g / cm³) 3 ) Coating weight (g / 1540.25mm) 2 ) Compaction density (g / cm³) 3 ) Coating weight (g / 1540.25mm) 2 ) Example 1 No / / 1,5 175 / Example 14 Yes 1,4 87,5 1,6 87,5 1:1 Example 15 Yes 1,35 87,5 1,5 87,5 1:1 Example 16 Yes 1,5 87,5 1,75 87,5 1:1 Example 17 Yes 1,4 70 1,6 105 4:6 Example 18 Yes 1,4 105 1,6 70 6:4 Table 6 registration Battery cell performance test k-value (mV / h) Capacity retention rate (%) after 1000 cycles at 25°C Example 1 0,05 92,5 Example 14 0,03 93,2 Example 15 0,01 93,6 Example 16 0,08 91,2 Example 17 0,03 93,2 Example 18 0,02 93,4

[0161] As can be seen from Tables 5 and 6, the anode film layer is arranged such that it includes a first active anode layer far away from the current collector and a second active anode layer close to the current collector, and the compaction density of the first active anode layer is lower than that of the second active anode layer, which can improve the safety performance and cycle performance of the battery cell.

[0162] It should be noted that the present disclosure is not limited to the embodiments mentioned above. The embodiments mentioned above are merely examples, and all embodiments that exhibit essentially the same structure and effects as the technical idea within the technical solution of the present disclosure are all included within the technical scope of the present disclosure. Furthermore, other embodiments in which various modifications conceivable to a person skilled in the art are added to the embodiments, and some components of the embodiments are combined to form the other embodiments, are also included within the scope of the present disclosure without departing from the core of the present disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] Standard GB / T 19077-2016

[0074]

Claims

Battery cell comprising a stacked electrode arrangement, wherein the stacked electrode arrangement comprises a cathode foil, a separator film and an anode foil stacked on top of each other; wherein the separator film comprises a base film and a coating arranged on both sides of the base film, the coating comprising a ceramic coating and an oil-based adhesive layer, the ceramic coating being arranged between the base film and the oil-based adhesive layer; wherein the thickness of the one-sided coating is 1 µm to 3 µm. Battery cell according to claim 1, wherein the thickness of the one-sided coating is 1 µm to 2.5 µm. Battery cell according to claim 1 or 2, wherein the thickness of the separating film is 9 µm to 13 µm. Battery cell according to one of claims 1 to 3, wherein the coating weight of the one-sided coating is 2 mg / 1540.25 mm2 to 4.5 mg / 1540.25 mm2. Battery cell according to one of claims 1 to 4, wherein the oil-based adhesive layer comprises an adhesive material, wherein the adhesive material comprises one or more of polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene copolymer. Battery cell according to claim 5, wherein the adhesive material comprises polyvinylidene fluoride. Battery cell according to one of claims 1 to 6, wherein the ceramic coating comprises a ceramic material, wherein the ceramic material comprises one or more of aluminium oxide, boehmite, silicon dioxide, magnesium oxide, titanium dioxide, tin oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, aluminium hydroxide, magnesium hydroxide and calcium hydroxide. Battery cell according to claim 7, wherein the ceramic material comprises aluminium oxide. Battery cell according to claim 7 or 8, wherein the average particle size of the ceramic material is between 0.2 µm and 0.8 µm. Battery cell according to one of claims 1 to 9, wherein the length-to-width ratio of the cathode foil and / or the anode foil is 4 to 5. Battery cell according to one of claims 1 to 10, wherein the length-to-width ratio of the cathode foil and / or the anode foil is 4.3 to 4.

8. Battery cell according to one of claims 1 to 11, wherein the compression density of the anode foil is 1.4 g / cm3 to 1.6 g / cm3. Battery cell according to one of claims 1 to 12, wherein the anode foil comprises an anode current collector and an anode film layer located on at least one side of the anode current collector and comprising an active anode material; wherein the active anode material comprises a graphite material, wherein the volumetric particle size distribution Dv50 of the graphite material is between 15 µm and 22 µm. Battery cell according to claim 13, wherein the specific surface area of ​​the graphite material is in the range of 0.5 m2 / g to 2 m2 / g. Battery cell according to claim 13 or 14, wherein the one-sided coating weight of the anode film layer is 160mg / 1540.25 mm2 to 200mg / 1540.25 mm2. Battery cell according to one of claims 13 to 15, wherein the anode film layer comprises a first active anode layer and a second active anode layer, wherein the second active anode layer is arranged between the anode current collector and the first active anode layer; wherein the density of the first active anode layer is lower than the density of the second active anode layer. Battery cell according to claim 16, wherein the density of the first active anode layer is 1.35 g / cm3 to 1.5 g / cm3; and / or wherein the density of the second active anode layer is 1.5 g / cm3 to 1.75 g / cm3. Battery cell according to claim 16 or 17, wherein the first active anode layer and the second active anode layer each comprise a graphite material, wherein the mass ratio of the graphite material in the first active anode layer and the second active anode layer is 4:6 to 6:

4. Battery cell according to one of claims 1 to 18, further comprising an electrolyte, wherein the electrical conductivity of the electrolyte is 10 S / m to 15 S / m. Battery device comprising a battery cell according to any one of claims 1 to 19. Power-consuming device comprising a battery device according to claim 20.

Images