Lithium ion battery with indented aluminum foil and indented aluminum foil processing device

Abstract

The utility model provides a lithium ion battery with an indented aluminum foil and a processing device for the indented aluminum foil. The lithium ion battery with the indented aluminum foil comprises a shell assembly, a lithium ion battery core and a lithium ion battery core, the positive electrode assembly comprises a positive plate, an aluminum foil structure and a positive electrode active material layer, the positive plate is connected with the aluminum foil structure and is partially located outside the shell assembly, the aluminum foil structure is provided with indentations, the positive electrode active material layer covers the aluminum foil structure, and the aluminum foil structure and the positive electrode active material layer are both located in the shell assembly. According to the technical scheme, the problem that in the prior art, in the using process of the lithium ion battery, due to the fact that the adhesive force of the positive electrode current collector is insufficient, and the stress bearing capacity is limited, the safety performance of the lithium ion battery is poor is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion battery manufacturing, and in particular to a lithium ion battery with an aluminum foil with indentations and a device for processing the aluminum foil with indentations. BACKGROUND

[0002] With the rapid development of portable electronic devices, electric vehicles, and power storage, the requirements for the cycle life, energy density, charge-discharge performance, and safety performance of lithium ion batteries are becoming higher and higher.

[0003] In traditional lithium ion batteries, aluminum foil is a common positive current collector, and the positive active material is usually coated on the aluminum foil surface of the smooth aluminum foil. When combined with the positive active material, its performance has an important influence on the overall performance of the battery.

[0004] In the prior art, the smooth positive current collector surface has the problems of small contact area, insufficient adhesion, limited stress bearing capacity, and the like, which affect the safety performance of the battery. CONTENT OF THE UTILITY MODEL

[0005] One technical problem to be solved by the present application is that, during the use of a lithium ion battery, the insufficient adhesion and limited stress bearing capacity of the positive current collector result in poor safety performance of the lithium ion battery.

[0006] To solve the above technical problem, the present application provides a lithium ion battery with an aluminum foil with indentations and a device for processing the aluminum foil with indentations.

[0007] The lithium ion battery with an aluminum foil with indentations provided by the present application comprises a shell assembly, a positive electrode assembly, the positive electrode assembly comprising a positive electrode sheet, an aluminum foil structure, and a positive active material layer, the positive electrode sheet being connected to the aluminum foil structure and partially located outside the shell assembly, the aluminum foil structure having indentations, and the positive active material layer being covered on the aluminum foil structure, the aluminum foil structure and the positive active material layer being both located inside the shell assembly.

[0008] In some embodiments, the projection of the indentation in the vertical direction is circular.

[0009] In some embodiments, the indentation depth is 2-5 mu m.

[0010] In some embodiments, the indentation diameter is 150-200 mu m.

[0011] In some embodiments, the indentations are arranged in multiple rows, each row of indentations comprising multiple indentations, and adjacent rows of indentations are arranged alternately.

[0012] In some embodiments, the spacing between adjacent indentations is 200-250 mu m.

[0013] In some embodiments, the lithium ion battery with the indented aluminum foil further comprises a negative electrode assembly and a separator assembly, the negative electrode assembly is partially located outside the housing assembly, and the separator assembly is arranged between the positive electrode assembly and the negative electrode assembly and located inside the housing assembly.

[0014] In some embodiments, the application further provides a device for processing the indented aluminum foil according to another aspect of the application, the device for processing the indented aluminum foil adopts the lithium ion battery with the indented aluminum foil described above, and the device for processing the indented aluminum foil comprises a rack structure, a first roller structure and a second roller structure, the first roller structure and the second roller structure are rotatably connected with the rack structure, the aluminum foil to be processed is arranged between the first roller structure and the second roller structure, and the first roller structure is provided with a protrusion corresponding to the indentation.

[0015] In some embodiments, the second roller structure comprises a second roller and an elastic layer, the second roller is rotatably connected with the rack structure, and the elastic layer is sleeved on the second roller.

[0016] In some embodiments, the rack structure comprises a rack and a mounting seat, the first roller structure is rotatably connected with the mounting seat, the second roller structure is rotatably connected with the rack, and the mounting seat is movably connected with the rack.

[0017] By means of the technical solution described above, the lithium ion battery with the indented aluminum foil provided by the application is provided with the indentation on the aluminum foil structure, the contact area of the positive electrode active material layer and the aluminum foil structure is increased, more attachment points are provided for the positive electrode active material layer, the adhesion between the positive electrode active material layer and the aluminum foil structure is improved, the specific capacity of the positive electrode material is improved, the positive electrode surface density is improved, the contact between the positive electrode active material layer and the aluminum foil structure is ensured during the charging and discharging process of the lithium ion battery, the contact resistance is reduced, and the energy density and the charging and discharging performance of the lithium ion battery are improved. The technical solution of the application effectively solves the problem of poor safety performance of the lithium ion battery caused by insufficient adhesion of the positive electrode current collector, limited stress bearing capacity and other problems in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A front view structural schematic diagram of the lithium ion battery with the indented aluminum foil disclosed in Embodiment One of the application is shown;

[0020] Figure 2a top view structural schematic diagram of the aluminum foil structure of the lithium ion battery with the aluminum foil with indentations is shown; Figure 1 a top view structural schematic diagram of the aluminum foil structure of the lithium ion battery with the aluminum foil with indentations is shown;

[0021] Figure 3 a top view structural schematic diagram of the aluminum foil structure of the lithium ion battery with the aluminum foil with indentations is shown; Figure 1 a sectional view structural schematic diagram of the aluminum foil structure of the lithium ion battery with the aluminum foil with indentations is shown;

[0022] Figure 4 a sectional view structural schematic diagram of the lithium ion battery with the aluminum foil with indentations is shown; Figure 1 a sectional view structural schematic diagram of the lithium ion battery with the aluminum foil with indentations is shown;

[0023] Figure 5 a structural schematic diagram of the aluminum foil with indentations processing device disclosed by the embodiments of the present application is shown;

[0024] Figure 6 a structural schematic diagram of the aluminum foil with indentations processing device rack structure is shown. Figure 5 a structural schematic diagram of the aluminum foil with indentations processing device rack structure is shown.

[0025] Explanation of reference signs:

[0026] 10, housing assembly; 20, positive electrode assembly; 21, positive electrode sheet; 22, aluminum foil structure; 221, indentation; 30, negative electrode assembly; 40, diaphragm assembly; 51, rack structure; 511, rack; 512, mounting seat; 52, first roller shaft structure; 53, second roller shaft structure. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be further described in conjunction with the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, and the present application can be implemented in many different forms, and is not limited to the specific embodiments of the present application, but includes all technical solutions falling within the scope of the claims.

[0028] The present application provides these embodiments in order to make the present application thorough and complete, and fully express the scope of the present application to the person skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these embodiments should be interpreted as merely exemplary, and not as a limitation.

[0029] It should be noted that in the description of the present application, unless otherwise specified and limited, the meaning of "a plurality of" is greater than or equal to two; The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In addition, "first", "second", and similar words used in the present application do not indicate any order, number or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0031] It should also be noted that in the description of the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. When it is described that a specific device is located between a first device and a second device, there can be or can not be an intermediate device between the specific device and the first device or the second device.

[0032] All terms used in the present application have the same meaning as understood by those skilled in the art to which the present application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted to have meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or extremely formalized sense, unless specifically defined here.

[0033] Techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be considered as part of the specification.

[0034] As Figures 1 to 4As shown, the lithium ion battery with aluminum foil with indentation disclosed by the embodiment one of the present application comprises: a shell assembly 10 and a positive electrode assembly 20, the positive electrode assembly 20 comprises a positive electrode sheet 21, an aluminum foil structure 22 and a positive electrode active material layer, the positive electrode sheet 21 is connected with the aluminum foil structure 22 and part of which is located outside the shell assembly 10, the aluminum foil structure 22 has an indentation 221, and the positive electrode active material layer covers the aluminum foil structure 22, and the aluminum foil structure 22 and the positive electrode active material layer are both located in the shell assembly 10.

[0035] The technical scheme of the embodiment one is applied, the indentation 221 is arranged on the aluminum foil structure 22, the contact area of the positive electrode active material layer and the aluminum foil structure 22 is increased, more attachment points are provided for the positive electrode active material layer, the adhesion between the positive electrode active material layer and the aluminum foil structure 22 is improved, the specific capacity of the positive electrode material is improved, and the positive electrode surface density is improved, so that the contact between the positive electrode active material layer and the aluminum foil structure 22 is good during the charging and discharging process of the lithium ion battery, the contact resistance is reduced, and the energy density and the charging and discharging performance of the lithium ion battery are improved. The technical scheme of the embodiment one effectively solves the problem of poor safety performance of the lithium ion battery caused by insufficient adhesion of the positive electrode current collector, limited stress bearing capacity and other problems in the prior art during use of the lithium ion battery.

[0036] As shown in Figure 2 and Figure 3 in the technical scheme of the embodiment one, the projection of the indentation 221 in the vertical direction is circular. The stress of the circular indentation 221 is uniformly distributed, and the circular recess formed on the surface of the aluminum foil structure 22 can provide relatively stable attachment points for the positive electrode active material layer. The indentation 221 of this shape is relatively easy to control the depth and spacing during processing, and can ensure the consistency of the aluminum foil structure 22 as a whole. Figure 2 and Figure 3 As shown in the technical scheme of the embodiment one, the depth of the indentation 221 is 2 μm to 5 μm. In the technical scheme of the embodiment one, the thickness of the aluminum foil structure 22 is 10-20 μm, and the surface density is 27-54 (grams per square meter). When the depth of the indentation 221 is less than 2 μm, the combination between the positive electrode active material layer and the aluminum foil structure 22 is not firm enough, and in the process of long-term use of the lithium ion battery, the phenomenon of active material falling off is easy to occur, and the cycle life of the lithium ion battery is reduced; when the depth of the indentation 221 is greater than 5 μm, the thickness of the aluminum foil structure 22 in the indentation 221 area is thinner, while the thickness of the aluminum foil structure 22 in other areas is thicker, the thickness variation of the aluminum foil structure 22 is larger, which affects the flatness and the compaction density of the positive electrode assembly 20, and affects the performance of the lithium ion battery.

[0037] As shown in Figure 2 and Figure 3As shown in the technical solution of Embodiment One, the indentation 221 has a diameter of 150-200 μm. When the diameter of the indentation 221 is less than 150 μm, the contact area between the indentation 221 and the positive active material layer is small, which cannot effectively provide sufficient contact points for the active material to combine with the aluminum foil structure 22, and the two are not firmly combined, which can easily cause the active material to fall off during the long-term use of the lithium ion battery, reducing the cycle life of the lithium ion battery. When the diameter of the indentation 221 is greater than 200 μm, the tensile strength of the aluminum foil structure 22 as a whole is weakened, and the aluminum foil structure is easily damaged, causing internal short circuit of the lithium ion battery.

[0038] As shown in the technical solution of Embodiment One, Figure 2 and Figure 3 As shown in the technical solution of Embodiment One, the indentation 221 is provided with multiple rows, each row of indentation 221 includes multiple indentations, and adjacent rows of indentations 221 are staggered. The indentation 221 is located on the perpendicular line of the two closest indentations 221 of adjacent rows, and the distance between any two of the above three indentations 221 is the same, that is, the connecting line of the three is an equilateral triangle. The multiple indentations 221 arranged in this way make the stress distribution on the entire aluminum foil structure 22 uniform, and the aluminum foil structure 22 is not easily damaged.

[0039] As shown in the technical solution of Embodiment One, Figure 2 and Figure 3 As shown in the technical solution of Embodiment One, the distance between adjacent indentations 221 is 200-250 μm. When the distance between adjacent indentations 221 is less than 200 μm, the stress between adjacent indentations is superimposed, and the aluminum foil structure 22 is easily damaged, causing internal short circuit of the lithium ion battery; when the distance between adjacent indentations 221 is greater than 250 μm, the adhesion between the aluminum foil structure 22 in the area between adjacent indentations 221 and the positive active material layer is small, and the positive active material is easily detached, reducing the cycle life of the battery.

[0040] As shown in the technical solution of Embodiment One, Figure 1 and Figure 4 As shown in the technical solution of Embodiment One, the lithium ion battery with an indentation aluminum foil further includes a negative electrode assembly 30 and a separator assembly 40, the negative electrode assembly 30 is partially located outside the shell assembly 10, and the separator assembly 40 is arranged between the positive electrode assembly 20 and the negative electrode assembly 30 and located inside the shell assembly 10. The separator assembly 40 is used to separate the positive electrode assembly 20 and the negative electrode assembly to avoid short circuit between the two, and provides different working spaces for the two, and the separator assembly 40 has micropores for lithium ions to pass through, ensuring the normal charging and discharging of the lithium ion battery.

[0041] The technical solution of the second embodiment is different from the technical solution of the first embodiment in that the projection of the indentation 221 in the vertical direction is a polygon. The inner wall of the polygonal indentation 221 has an angle, which improves the mechanical interlocking force between the positive active material layer and the aluminum foil structure 22, and further avoids the shedding of the positive active material. In the second embodiment, the depth of the indentation 221 is 2-3 μm, and the pitch is 200-250 μm. The determination of the size of the indentation 221 needs to consider factors such as the shape, depth of the indentation 221, and the size of the aluminum foil structure 22. By optimizing the pitch of the indentation 221, the best combination of the aluminum foil structure 22 and the positive active material can be achieved, and the charging and discharging efficiency and cycle life of the battery can be improved.

[0042] As shown in Figure 5 and Figure 6 According to another aspect of the present application, a pressed aluminum foil processing device is also provided. The pressed aluminum foil processing device uses the above-mentioned lithium ion battery with pressed aluminum foil. The pressed aluminum foil processing device includes a rack structure 51, a first roller shaft structure 52, and a second roller shaft structure 53. The first roller shaft structure 52 and the second roller shaft structure 53 are rotatably connected to the rack structure 51. The aluminum foil to be processed is arranged between the first roller shaft structure 52 and the second roller shaft structure 53. The first roller shaft structure 52 has a protrusion corresponding to the indentation 221. The flat aluminum foil is placed between the first roller shaft structure 52 and the second roller shaft structure 53. The rotation directions of the first roller shaft structure 52 and the second roller shaft structure 53 are opposite, driving the aluminum foil to move. As the aluminum foil passes through the first roller shaft structure 52 and the second roller shaft structure 53, the protrusion on the first roller shaft structure 52 presses the surface of the aluminum foil, making it become the aluminum foil structure 22 with the indentation 221. The pressed aluminum foil processing device of the present application processes the indentation 221 on the aluminum foil structure 22 while conveying the aluminum foil structure 22. The pressed aluminum foil processing device is arranged at the front end of the coating machine. After the indentation 221 is processed, the aluminum foil structure 22 can directly enter the coating machine to complete the positive material spraying, and finally be made into a positive plate. The pressed aluminum foil processing device of the present application can continuously operate, has high processing efficiency, and provides a continuous supply of pressed aluminum foil for subsequent processes, thereby improving production efficiency.

[0043] As shown in Figure 5 and Figure 6 In the technical solution of the present application, the second roller shaft structure 53 includes a second roller shaft and an elastic layer. The second roller shaft is rotatably connected to the rack structure 51, and the elastic layer is sleeved on the second roller shaft. The elastic layer is made of rubber material, which increases the friction force between the aluminum foil structure 22 and the second roller shaft structure 53, avoids the slippage of the aluminum foil structure 22, and reduces the size error of the indentation 221. The elastic layer also absorbs the impact when the protrusion presses the aluminum foil structure 22, avoids the damage of the aluminum foil structure 22, and reduces the reaction force on the protrusion, thereby improving the service life of the protrusion.

[0044] As shown in Figure 5 and Figure 6 In the technical solution of the present application, the rack structure 51 comprises a rack 511 and a mounting seat 512, the first roller shaft structure 52 is rotatably connected with the mounting seat 512, the second roller shaft structure 53 is rotatably connected with the rack 511, and the mounting seat 512 is movably connected with the rack 511. The first roller shaft structure 52 moves with the movement of the mounting seat 512, and the spacing between the first roller shaft structure 52 and the second roller shaft structure 53 changes with the movement of the first roller shaft structure 52, so that the aluminum foil with indentation processing device can be suitable for processing aluminum foil structures 22 with different thicknesses, and the versatility is stronger. The rack 511 comprises a sliding rail, and the mounting seat 512 comprises a sliding groove, which cooperates with the sliding rail to guide the movement of the mounting seat 512.

[0045] In summary, the present application provides a kind of indentation type lithium ion battery aluminum foil (aluminum foil structure 22), aluminum foil (aluminum foil structure 22) surface has indentation structure (indentation 221).Indentation type aluminum foil structure (aluminum foil structure 22) includes multiple indentation units (indentation 221), the shape of indentation unit can be circular, oval, polygon or irregular shape.Indentation 221 of indentation type aluminum foil is 2-5 μm in depth, 150-200 μm in diameter, and 200-250 μm in pitch.Suitable indentation depth, diameter and pitch can maintain the tensile strength of the aluminum foil while ensuring the increase of the contact area and adhesion of the aluminum foil and the positive active material, and ensure the reliability of the battery.When the indentation depth is less than 2um, the diameter is less than 150um, and the pitch is greater than 250um, the indentation is too shallow, the diameter is too small, and the pitch is too large, which may not effectively provide enough contact points between the active material and the aluminum foil, and the role of the indentation cannot be fully played, and the contact area cannot be effectively increased and the adhesion cannot be improved.The combination of active material and aluminum foil is not firm enough, and active material may fall off during long-term use of the battery, reducing the cycle life of the battery.When the indentation depth is greater than 5um, the diameter is greater than 200um, and the pitch is less than 200um, the indentation is too deep, the diameter is too large, and the pitch is too small, which may cause the local thickness of the aluminum foil to change too much, and the uneven thickness of the aluminum foil may affect the flatness and compaction density of the electrode, and further affect the performance of the battery.Meanwhile, it may weaken the overall tensile strength of the aluminum foil, and if the tensile strength of the aluminum foil is insufficient, the stress between adjacent indentations may be superimposed, increasing the risk of aluminum foil rupture and causing internal short circuit and other safety problems of the battery.The thickness of the indentation type aluminum foil is 10-20 μm, and the area density is 27-54 (grams per square meter).A specific indentation device (aluminum foil with indentation processing device) is used, which consists of a steel roller with protrusions (first roller structure 52) and a smooth rubber roller (second roller structure 53).The gap between the two rollers can be adjusted to accommodate foils of various thicknesses.The surface of the steel roller has a certain number of protrusions, each protrusion is 2-5 μm high, 150-200 μm in diameter, and 200-250 μm in pitch.The aluminum foil is clamped between the steel roller with protrusions and the smooth rubber roller, and the roller rotates to drive the aluminum foil while applying pressure to the aluminum foil surface, forming indentation units with a depth of 2-5 μm, a diameter of 150-200 μm, and a pitch of 200-250 μm.The indentation device is arranged in front of the coating, and the pressed aluminum foil is directly pulled to the positive electrode coating head area of the coating machine through the roller. The front indentation device can be driven to rotate by the tension of the coating machine, or the indentation device with a servo motor can drive the two rollers to rotate continuously. The aluminum foil between the two rollers is pressed and the surface forms an indentation. The indentation device with a servo motor can be linked with the coating machine for aluminum foil indentation treatment, or it can be used alone for aluminum foil indentation treatment. The aluminum foil with a thickness of 10-13 μm is introduced into the indentation device, the aluminum foil is fixed and clamped between the gap of the convex indentation steel roller and the smooth rubber roller, the roller rotates to drive the aluminum foil and at the same time applies pressure to the surface of the aluminum foil, forming a circular indentation unit with a depth of 2-3 μm, a diameter of 150-200 μm, and a spacing of 200-250 μm. The indentation processing of the aluminum foil is realized by adjusting the pressure, speed and other parameters. The width of the indentation 221 is consistent with the coated width of the material area, or a blank area can be reserved on both sides. Subsequently, the aluminum foil with the indentation 221 is used for coating, rolling, and sheet making to form a positive electrode sheet (positive electrode assembly 20), which is combined with a corresponding negative electrode sheet (negative electrode assembly 30) and a separator (separator assembly 40) to form a lithium cell by winding / stacking, and then the lithium ion battery with the indentation aluminum foil (lithium ion battery with the indentation aluminum foil) is manufactured through the processes of assembly, baking, liquid injection, and formation. The circular indentation 221 has uniform stress distribution characteristics, and the circular depression formed on the surface of the aluminum foil can provide relatively stable attachment points for the positive electrode active material. The indentation 221 of this shape is relatively easy to control the depth and spacing during processing, which can ensure the consistency of the aluminum foil as a whole. A kind of indentation type lithium ion battery aluminum foil with a polygonal indentation unit is prepared. By optimizing the parameters and process of the indentation equipment, a polygonal indentation unit with a depth of 2-3 μm and a spacing of 200-250 μm is prepared. Subsequently, the aluminum foil with the indentation is used for coating, rolling, and sheet making to form a positive electrode sheet, which is combined with a corresponding negative electrode sheet and a separator to form a lithium cell by winding / stacking, and then the lithium ion battery with the indentation aluminum foil is manufactured through the processes of assembly, baking, liquid injection, and formation. The polygonal indentation shape is diverse and can be customized according to different applications. The corner part of the polygonal indentation 221 can increase the mechanical engagement force with the positive electrode active material and improve the adhesion. The determination of the spacing of the indentation 221 needs to consider factors such as the shape, depth of the indentation 221, and the size of the aluminum foil. By optimizing the spacing of the indentation 221, the best combination of the aluminum foil and the positive electrode active material can be achieved, and the charge-discharge efficiency and cycle life of the battery can be improved.

[0046] So far, the embodiments of the present application have been described in detail. In order not to obscure the concept of the present application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions of the present application according to the above description.

[0047] Although some specific embodiments of the present application have been described in detail by way of examples, one skilled in the art should understand that the above examples are only for the purpose of illustration, but not for the purpose of limiting the scope of the present application. One skilled in the art should understand that the above embodiments can be modified or equivalent replacements can be made to some technical features without departing from the scope and spirit of the present application. In particular, each technical feature mentioned in each embodiment can be combined in any manner as long as there is no structural conflict.

Claims

1. A lithium ion battery having an aluminum foil with indentations, characterized in that, The application relates to a lithium ion battery with an aluminum foil with indentations. The application relates to a lithium ion battery with an aluminum foil with indentations. The projection of the indentation (221) in the vertical direction is circular.

2. The lithium-ion battery with an indented aluminum foil according to claim 1, wherein, The depth of the indentation (221) is 2-5 microns.

3. The lithium-ion battery with an indented aluminum foil according to claim 2, wherein, The diameter of the indentation (221) is 150-200 microns.

4. The lithium-ion battery with an indented aluminum foil according to claim 2, wherein, The indentation (221) is provided with multiple rows, each row of the indentation (221) comprising multiple indentations, and adjacent rows of the indentation (221) are staggered.

5. The lithium-ion battery with an indented aluminum foil according to claim 2, wherein, The spacing between adjacent indentations (221) is 200-250 microns.

6. The lithium-ion battery with an indented aluminum foil according to claim 5, wherein, The lithium ion battery with the aluminum foil with indentations further comprises a negative electrode assembly (30) and a separator assembly (40), the negative electrode assembly (30) being partially located outside the shell assembly (10), and the separator assembly (40) being arranged between the positive electrode assembly (20) and the negative electrode assembly (30) and located inside the shell assembly (10).

7. The lithium-ion battery with an embossed aluminum foil according to any one of claims 1 to 6, characterized in that, The indentation aluminum foil processing device adopts the lithium ion battery with the indentation aluminum foil according to any one of claims 1-7, and comprises a rack structure (51), a first roller shaft structure (52) and a second roller shaft structure (53), the first roller shaft structure (52) and the second roller shaft structure (53) are rotatably connected with the rack structure (51), and the aluminum foil to be processed is arranged between the first roller shaft structure (52) and the second roller shaft structure (53), the first roller shaft structure (52) is provided with a protrusion corresponding to the indentation (221).

8. A creasing aluminum foil processing apparatus characterized by comprising: The second roller shaft structure (53) comprises a second roller shaft and an elastic layer, the second roller shaft is rotatably connected with the rack structure (51), and the elastic layer is sleeved on the second roller shaft.

9. The scored aluminum foil processing apparatus of claim 8, wherein, The rack structure (51) comprises a rack (511) and a mounting seat (512), the first roller shaft structure (52) is rotatably connected with the mounting seat (512), the second roller shaft structure (53) is rotatably connected with the rack (511), and the mounting seat (512) is movably connected with the rack (511).

10. The scored aluminum foil processing apparatus of claim 8, wherein, ​

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