A high-performance battery cell structure

Abstract

This invention discloses a high-performance battery cell structure, comprising a hollow battery cell shell; an inner cavity of the battery cell shell containing a battery cell electrode assembly; and an interior of the battery cell shell containing a composite magnet layer; the composite magnet layer comprising a magnetic coating, an insulating protective layer, and an outer protective film; the magnetic coating being applied at a predetermined coating location inside the battery cell shell; the insulating protective layer covering the surface of the magnetic coating; and the outer protective film covering the surface of the insulating protective layer. This invention discloses a high-performance battery cell structure with a scientifically designed magnetic field. The magnetic coating constructs a magnetic field that can effectively interfere with the electric field and the transmission of lithium ions (specifically, the magnetic coating generates a magnetic field that effectively promotes the transmission of lithium ions (Li+)). The battery cell assembled with this structure exhibits significantly improved discharge capacity, reduced internal resistance, and enhanced battery performance.

Description

Technical Field

[0001] This invention relates to the field of battery cell manufacturing technology, and in particular to a high-performance battery cell structure. Background Technology

[0002] Lithium-ion batteries have advantages such as high specific energy, high cycle life, and long storage time. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools. Therefore, the performance requirements for lithium-ion batteries are becoming increasingly stringent.

[0003] Currently, the two main directions of lithium-ion battery development are: improving capacity density and increasing charge / discharge rate. Improving capacity density primarily relies on enhancing raw materials, but the persistently high price of raw materials makes this increasingly difficult. Improving charge rate, on the other hand, is based on lower internal resistance, but optimizing the battery system to improve internal resistance is complex and energy-intensive.

[0004] Meanwhile, during charging and discharging, the lithium-ion transfer speed may slow down locally due to different stress points on the battery cell. During the battery's lifespan, there is a risk of lithium plating in certain areas of the battery, affecting the battery's cycle life and safety. Summary of the Invention

[0005] The purpose of this invention is to provide a high-performance battery cell structure to address the technical deficiencies of existing technologies.

[0006] Therefore, the present invention provides a high-performance battery cell structure, which includes a hollow battery cell housing;

[0007] The inner cavity of the battery cell casing is provided with a battery cell electrode assembly;

[0008] Inside the battery cell casing, there is also a composite magnet layer;

[0009] The composite magnet layer includes a magnetic coating, an insulating protective layer, and an outer protective film;

[0010] Magnetic coating, applied to a predetermined coating location inside the cell casing;

[0011] An insulating protective layer covers the surface of the magnetic coating;

[0012] The outer protective film covers the surface of the insulating protective layer;

[0013] The preparation of the magnetic coating includes the following steps:

[0014] Step 1, slurry preparation: Mix the powdered magnetic coating material with the binder and stir evenly, then gradually add solvent to dilute and stir to obtain the magnetic coating slurry;

[0015] The second step is slurry coating: the magnetic coating slurry obtained in the first step is uniformly coated onto the preset coating position inside the cell shell. After the magnetic coating slurry dries, the magnetic coating is obtained.

[0016] The preparation of the insulating protective layer includes the following operations:

[0017] The insulating binder, insulating additives, and insulating dispersant are mixed and stirred evenly to obtain an insulating protective layer slurry. The insulating protective layer slurry is then coated onto the surface of the magnetic coating, completely covering the surface of the magnetic coating. After the insulating protective layer slurry dries, an insulating protective layer is obtained.

[0018] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a high-performance cell structure with a scientific design. The magnetic field body constructed by the magnetic coating can realize the interference of the magnetic field on the electric field and the transmission of lithium ions (specifically, the magnetic coating generates a magnetic field, which has a good promoting effect on the transmission of lithium ions Li+). The discharge capacity of the battery cell assembled with this structure is significantly improved, the internal resistance is reduced, and the performance of the battery is improved.

[0019] The unique feature of this invention is that by setting a magnetic field at a specific location in the battery, the battery capacity can be increased, the lithium-ion transfer speed at that specific location can be accelerated, and the problem of lithium plating at the corners of the cell electrode assembly caused by the obstruction of lithium-ion transfer can be avoided.

[0020] This invention reduces internal resistance, increases lithium-ion transport speed and activity, and improves cell capacity through the interaction of magnetism and electricity. The technical solution of this invention is applicable not only to batteries but also to battery packs / packs, resulting in an overall capacity improvement effect. Attached Figure Description

[0021] Figure 1 A schematic diagram of a high-performance battery cell structure provided by the present invention;

[0022] Figure 2 A schematic diagram of the composite magnet layer in a high-performance battery cell structure provided by the present invention;

[0023] Figure 3 A schematic diagram comparing the charging and discharging capacity of the battery cell under magnetic and no magnetic fields.

[0024] Figure 4 This is a schematic diagram comparing the DCIR (DC internal resistance) of a battery cell under magnetic and non-magnetic conditions. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] See Figures 1 to 4 The present invention provides a high-performance battery cell structure, including a hollow battery cell housing 1;

[0030] The inner cavity of the cell housing 1 is provided with a cell electrode assembly;

[0031] Inside the battery cell housing 1, a composite magnet layer 2 is also provided;

[0032] The composite magnet layer 2 includes a magnetic coating 201, an insulating protective layer 202, and an outer protective film 203;

[0033] Magnetic coating 201 is applied to a predetermined coating position inside the cell housing 1;

[0034] An insulating protective layer 202 covers the surface of the magnetic coating 201 and serves to provide insulation protection for the magnetic coating 201.

[0035] The outer protective film 203 covers the surface of the insulating protective layer 202 to protect the insulating protective layer 202 from external scratches.

[0036] In this invention, specifically, the insulating protective layer 202 is coated onto the surface of the magnetic coating 201.

[0037] In this invention, specifically, the outer protective film 203 is an insulating film pasted on the surface of the insulating protective layer 202.

[0038] In this invention, specifically, a cell cover plate is provided on the top of the cell housing 1;

[0039] Positive terminal 3 and negative terminal 4 are respectively provided at the left and right ends of the battery cell cover.

[0040] The bottom of the inner cavity of the cell housing 1 is covered with horizontally distributed lower gaskets (insulating gaskets);

[0041] When the cell electrode assembly inside the cell housing 1 is placed vertically, the preset coating positions inside the cell housing 1 are specifically: the lower surface of the cell cover plate and the upper surface of the lower gasket (first scheme);

[0042] When the cell electrode assembly inside the cell housing 1 is flat (i.e., horizontal, lying flat), the preset coating position inside the cell housing 1 is specifically: the inner wall of the four sides of the cell housing 1 (second scheme).

[0043] It should be noted that the positive and negative tabs of the battery cell electrode assembly are connected to the bottom of the positive terminal 3 and the bottom of the negative terminal 4, respectively, to achieve electrical conduction.

[0044] It should be noted that the preset coating positions inside the cell casing 1 can be flexibly adjusted according to different battery structures. The coating positions are not fixed and can include all positions that can improve battery capacity and lithium-ion transfer rate. Battery cells are not limited to prismatic aluminum-cased battery cells, but also include round, pouch, and other types of battery cells.

[0045] In specific implementation, in this invention, the first approach is to coat the lower surface of the cell cover plate and the upper surface of the lower gasket with a magnetic coating 201; the second approach is to coat the inner wall of the side walls around the cell housing 1 with a magnetic coating 201. These two approaches are chosen differently depending on the structure of the cell: for example, when the cell electrode group inside the cell housing 1 is placed vertically (i.e., placed perpendicular to the horizontal plane, in which case the positive and negative electrodes of the electrode group are distributed at the top of the electrode group), then the first approach is used to coat the magnetic coating 201; if the cell electrode group inside the cell housing 1 is placed flat (i.e., placed horizontally or lying flat), then the coating is applied around the cell (i.e., the second approach is used to coat the magnetic coating 201), which involves the issue of the force of the magnetic field.

[0046] In this invention, specifically, the preparation of the magnetic coating 201 includes the following operations:

[0047] Step 1, slurry preparation: Mix the powdered magnetic coating material with the binder and stir evenly, then gradually add solvent to dilute and stir to obtain the magnetic coating slurry;

[0048] The second step is slurry coating: The magnetic coating slurry obtained in the first step is uniformly coated on the preset coating positions inside the cell housing 1 (e.g., the lower surface of the cell cover plate, the inner wall of the side walls of the cell housing 1, and the upper surface of the lower gasket). After the magnetic coating slurry dries, the magnetic coating 201 can be obtained.

[0049] In the first step, the solute in the magnetic coating slurry includes the magnetic coating material and the binder, and the solute comprises the following components by mass percentage:

[0050] 90-98% magnetic coating material and 2-10% binder;

[0051] In magnetic coating slurries, the solvent accounts for 20%–60% of the mass of the solute (including the magnetic coating material and binder).

[0052] In practice, the solute may include 92% by mass of magnetic coating material and 8% by mass of binder; the solvent accounts for 40% by mass of the solute.

[0053] In the first step, the magnetic coating material includes at least one of alloys, ferrites, and intermetallic compounds;

[0054] In specific implementation, the alloy includes at least one of the following: natural ferrite magnetic materials, AlNi(Co), FeCr(Co), and FeCrMo alloys;

[0055] It should be noted that natural ferromagnetic materials can be, for example, FeO·Fe2O3 (Fe3O4).

[0056] Ferrites, including at least one of ferrites such as BaO·6Fe2O3, SrO·6Fe2O3 and PbO·6Fe2O3;

[0057] Intermetallic compounds, including at least one of the following: FeCrCo, PtCo, MnAlC, CuNiFe, and AlMnAg.

[0058] In the first step, the binder is polyvinylidene fluoride (PVDF).

[0059] In the first step, the magnetic coating material is in powder form, and the powders are bonded together by a PVDF-based adhesive.

[0060] In the first step, the solvent includes at least one of NMP, DMC, and EC.

[0061] It should be noted that, in this invention, the solvent between the binder and the magnetic coating material powder is one or more of organic NMP, DMC, EC, etc. The magnetic coating material and binder are mixed and then uniformly stirred using a planetary mixer. Subsequently, the solvent is gradually added for dilution and stirring to form a slurry.

[0062] In this invention, specifically, the preparation of the insulating protective layer 202 includes the following operations:

[0063] The insulating binder, insulating additives and insulating dispersant (the dispersant is used as a solvent) are mixed and stirred evenly to obtain an insulating protective layer slurry. The insulating protective layer slurry is then coated on the surface of the magnetic coating 201, and the insulating protective layer slurry completely covers the surface of the magnetic coating 201. After the insulating protective layer slurry dries, the insulating protective layer 202 is obtained.

[0064] In the insulating protective layer slurry, the solute includes binders and additives, and the solute comprises the following components by mass percentage:

[0065] 4–17% binder and 83–96% additives;

[0066] In the insulating protective layer slurry, the mass of the solvent accounts for 20% to 60% of the mass of the solute (including binders and additives).

[0067] In practice, the solute may include 12% by mass of binder and 88% by mass of additives; the solvent accounts for 36% by mass of the solute.

[0068] In terms of specific implementation, regarding the preparation of the insulating protective layer 202, the insulating adhesive can be polyvinylidene fluoride (PVDF).

[0069] In terms of specific implementation, regarding the preparation of the insulating protective layer 202, the insulating additives can be ceramic or borosilicate additives, such as ceramic powder or borosilicate powder.

[0070] In terms of specific implementation, regarding the preparation of the insulating protective layer 202, the insulating dispersant can be NMP (N-methylpyrrolidone), specifically one or more of the NMP class.

[0071] To better understand the technical solution of the present invention, the following specific embodiments will be used to illustrate the technical solution of the present invention.

[0072] Example 1.

[0073] PVDF powder was placed in a planetary stirrer, and NMP solvent was added (PVDF:NMP ratio 1:10). The mixture was stirred for 30 minutes at a speed of 1500 rpm. After stirring, the mixture was cooled to room temperature for 30 minutes. Subsequently, BaO·6Fe2O3 and Fe2O3 powders were added, maintaining a mass ratio of 2:1. The stirring speed was 2000 rpm for 60 minutes. The resulting slurry was used as the magnetic coating slurry.

[0074] This magnetic coating paste was applied to the inner surface of the cell cover plate at a coating amount of 100 mg / cm². 2 Simultaneously, a magnetic coating slurry is applied to the bottom inner surface of the battery cell casing at a coating amount of 100 mg / cm². 2 The coating covers the entire inner surface of the cell casing and cell cover. The coated cell casing and cell cover are then placed in an oven and dried at 70°C for 24 hours to obtain the magnetic coating.

[0075] PVDF and boehmite powder were placed in a stirrer at a weight ratio of 1:5, with NMP as the dispersant. The stirring speed was 1300 r / min, and the stirring time was 60 min. After stirring, an insulating protective layer slurry was obtained. The insulating protective layer slurry was coated onto the surface of the above magnetic coating and dried in an oven for 24 h. After drying, an insulating protective layer was obtained. Polyimide tape (as an outer protective film) was then adhered to the surface of the insulating protective layer, completely covering its surface.

[0076] In Example 1, the electrode assembly in the battery cell is in a wound form, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a finishing tape. The positive electrode sheet includes a current collector and a surface-active material, and the negative electrode sheet includes a current collector and a surface-active material. The separator is a PE-based film. After the positive electrode sheet, negative electrode sheet, and separator are wound, a square electrode assembly is formed. The wound battery cell electrode assembly is connected to the battery cell cover plate through initial soldering and final soldering processes. The lower surface of the battery cell cover plate and the inner bottom surface of the battery cell shell have been pre-coated with a magnetic material layer (i.e., a composite magnet layer) to form the main body for energy storage. After the battery cell is filled with electrolyte, a complete battery cell body is formed.

[0077] During the charging and discharging process of the battery cell, the magnetic coating on the battery cell casing and the magnetic coating on the bottom of the battery cell casing will form a strong magnetic field. The magnetic field acts on the inside of the electrode group and the C-corner of the electrode group, which promotes the increase of ion transfer speed, reduces lithium ion transfer impedance, and delays the occurrence of lithium plating problem at the C-corner.

[0078] It should be noted that the C-corner of the pole group refers to the curved end (e.g., the lower end) on the side of the pole group formed by winding. This side may fail during the cycle process because the winding tension is different from that of the main side.

[0079] Example 2.

[0080] PVDF powder was placed in a planetary stirrer, and NMP solvent was added (PVDF:NMP ratio 1:10). The mixture was stirred for 30 minutes at a speed of 1500 rpm. After stirring, the mixture was allowed to cool to room temperature for 30 minutes. Subsequently, natural magnetite ore was ground into powder in a crusher and grinder. The powder was then added to the PVDF slurry, and the mixture was stirred at a speed of 2000 rpm for 60 minutes. The resulting slurry was used as the magnetic coating slurry.

[0081] This magnetic coating paste was applied to the inner surface of the cell cover plate at a coating amount of 100 mg / cm². 2 Simultaneously, a magnetic coating slurry is applied to the bottom inner surface of the battery cell casing at a coating amount of 100 mg / cm². 2 The coating covers the entire inner surface of the cell casing and cell cover. The coated cell casing and cell cover are then dried in an oven at 70°C for 24 hours to obtain the magnetic coating.

[0082] PVDF and boehmite powder were placed in a stirrer at a weight ratio of 1:5, with NMP as the dispersant. The stirring speed was 1300 r / min, and the stirring time was 60 min. After stirring, an insulating protective layer slurry was obtained. The insulating protective layer slurry was coated onto the surface of the above magnetic coating and dried in an oven for 24 h. After drying, an insulating protective layer was obtained. Polyimide tape (as an outer protective film) was adhered to the surface of the insulating protective layer, completely covering its surface.

[0083] In Example 2, the electrode assembly in the battery cell is in a wound form, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and a finishing tape. The positive electrode sheet includes a current collector and a surface-active material, and the negative electrode sheet includes a current collector and a surface-active material. The separator is a PE-based film. After the positive electrode sheet, negative electrode sheet, and separator are wound, a square electrode assembly is formed. The wound battery cell electrode assembly is connected to the battery cell cover plate through initial soldering and final soldering processes. The lower surface of the battery cell cover plate and the inner bottom surface of the battery cell shell have been pre-coated with a magnetic material layer (i.e., a composite magnet layer) to form the main body for energy storage. After the battery cell is filled with electrolyte, a complete battery cell body is formed.

[0084] During the charging and discharging process of the battery cell, the magnetic coating on the battery cell casing and the magnetic coating on the bottom of the battery cell casing will form a strong magnetic field. The magnetic field acts on the inside of the electrode group and the C-corner of the electrode group, which promotes the increase of ion transfer speed, reduces lithium ion transfer impedance, and delays the occurrence of lithium plating problem at the C-corner.

[0085] See Figure 3 As shown, Figure 3 This diagram illustrates the comparison of charge and discharge capacities of battery cells with and without magnetic coatings. Figure 3 In the diagram, 1 turn, 2 turns...5 turns correspond to the first, second, ... fifth turns of charging and discharging, respectively. By comparison, it can be found that the charging and discharging capacity of the battery cell is significantly improved after adding the coating structure.

[0086] exist Figure 3 In the graph, the horizontal axis represents the comparison between applying a magnetic field and not applying a magnetic field, specifically including the comparison under different charge-discharge cycles, with the aim of illustrating the comparison of having and not having a magnetic field after multiple charge-discharge cycles; the vertical axis represents the charge-discharge capacity of the battery cell.

[0087] See Figure 4 As shown, Figure 4 This is a schematic diagram comparing the DCIR (direct current internal resistance) during charging and discharging of battery cells with and without magnetic coatings. Figure 4 It can be seen that the internal resistance of the battery cell is large when there is no magnetic coating. However, after adding the magnetic coating structure, the DCIR (direct current internal resistance) of the battery cell is significantly reduced. This is mainly because the magnetic field exerts a force on the lithium ion Li+, which reduces the diffusion resistance of Li+, resulting in a decrease in the internal resistance of the battery cell.

[0088] exist Figure 4 In the graph, the horizontal axis represents the comparison between the application of a magnetic field and the absence of a magnetic field, specifically including the comparison of charging internal resistance and discharging internal resistance under charging and discharging conditions; the vertical axis represents the internal resistance value of the battery cell.

[0089] pass Figure 3 and Figure 4The comparison shows that the addition of a magnetic coating significantly reduces the internal resistance of the battery cell during charging and discharging, indicating that the magnetic coating promotes the transfer of lithium ions (Li+), resulting in a significant increase in charging and discharging capacity, which also demonstrates the promoting effect on the battery cell capacity.

[0090] Compared with existing technologies, the high-performance battery cell structure provided by this invention has the following advantages:

[0091] 1. Simple to manufacture, without affecting the production of other components. Compared to changing materials to improve performance, the improvement of this high-performance battery cell structure is more convenient and adaptable, suitable for mass production. Compared to general magnetic field emitting devices, this structure has lower costs.

[0092] 2. The performance improvement brought about by the high-performance cell structure provided by the present invention can be permanent, especially the improvement is significant in the later stages of cell charging and discharging.

[0093] 3. The high-performance cell structure provided by this invention can reduce the pressure to improve cell energy density to a certain extent, while also reducing cell design costs. It can also solve problems such as lithium plating at the C-angle of the electrode assembly to some extent. It should be noted that improving cell energy density becomes increasingly difficult after exceeding a certain threshold. This invention, through the addition of a magnetic coating, helps to improve cell capacity.

[0094] In summary, compared with the prior art, the high-performance cell structure provided by this invention is scientifically designed. Through the magnetic field body constructed by the magnetic coating, the magnetic field can interfere with the electric field and the transmission of lithium ions (specifically, the magnetic coating generates a magnetic field, which has a good promoting effect on the transmission of lithium ions Li+). The discharge capacity of the battery cell assembled with this structure is significantly improved, the internal resistance is reduced, and the battery performance is improved.

[0095] The unique feature of this invention is that by setting a magnetic field at a specific location in the battery, the battery capacity can be increased, the lithium-ion transfer speed at that specific location can be accelerated, and the problem of lithium plating at the corners of the cell electrode assembly caused by the obstruction of lithium-ion transfer can be avoided.

[0096] This invention reduces internal resistance, increases lithium-ion transport speed and activity, and improves cell capacity through the interaction of magnetism and electricity. The technical solution of this invention is applicable not only to batteries but also to battery packs / packs, resulting in an overall capacity improvement effect.

[0097] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-performance battery cell structure, characterized in that, Including a hollow cell casing (1); The inner cavity of the battery cell housing (1) is provided with a battery cell electrode assembly; Inside the battery cell housing (1), a composite magnet layer (2) is also provided. The composite magnet layer (2) includes a magnetic coating (201), an insulating protective layer (202), and an outer protective film (203). A magnetic coating (201) is applied to a predetermined coating position inside the cell housing (1); An insulating protective layer (202) covers the surface of the magnetic coating (201); An outer protective film (203) covers the surface of the insulating protective layer (202); The preparation of the magnetic coating (201) includes the following operations: Step 1, slurry preparation: Mix the powdered magnetic coating material with the binder and stir evenly, then gradually add solvent to dilute and stir to obtain the magnetic coating slurry; The second step is slurry coating: the magnetic coating slurry obtained in the first step is uniformly coated on the preset coating position inside the battery cell housing (1). After the magnetic coating slurry dries, the magnetic coating (201) can be obtained. The preparation of the insulating protective layer (202) includes the following operations: The insulating binder, insulating additive and insulating dispersant are mixed and stirred evenly to obtain an insulating protective layer slurry. The insulating protective layer slurry is then coated on the surface of the magnetic coating (201). The insulating protective layer slurry completely covers the surface of the magnetic coating (201). After the insulating protective layer slurry dries, an insulating protective layer (202) is obtained.

2. The high-performance cell structure as described in claim 1, characterized in that, An insulating protective layer (202) is applied to the surface of the magnetic coating (201). The outer protective film (203) is an insulating film that is pasted on the surface of the insulating protective layer (202).

3. The high-performance cell structure as described in claim 1, characterized in that, A cell cover plate is provided on the top of the cell housing (1); The bottom of the inner cavity of the battery cell housing (1) is covered with horizontally distributed lower gaskets; When the cell electrode assembly inside the cell housing (1) is placed vertically, the preset coating position inside the cell housing (1) is specifically: the lower surface of the cell cover plate and the upper surface of the lower gasket. When the cell electrode assembly inside the cell housing (1) is placed flat, the preset coating position inside the cell housing (1) is specifically: the inner wall of the side wall of the cell housing (1).

4. The high-performance cell structure as described in claim 1, characterized in that, In the first step, the solute in the magnetic coating slurry includes the magnetic coating material and the binder, and the solute comprises the following components by mass percentage: 90-98% magnetic coating material and 2-10% binder; In magnetic coating slurries, the mass of the solvent accounts for 20-60% of the mass of the solute.

5. The high-performance cell structure as described in claim 1 or 4, characterized in that, In the first step, the magnetic coating material is selected from at least one of alloys, ferrites, and intermetallic compounds; The alloy is selected from at least one of natural ferromagnetic materials, AlNi (Co), FeCr (Co), and FeCrMo; Ferrite, selected from at least one of BaO·6Fe2O3, SrO·6Fe2O3 and PbO·6Fe2O3; Intermetallic compounds selected from at least one of FeCrCo, PtCo, MnAlC, CuNiFe, and AlMnAg; In the first step, the adhesive is polyvinylidene fluoride (PVDF); In the first step, the solvent is selected from at least one of NMP, DMC, and EC.

6. The high-performance cell structure as described in claim 1, characterized in that, In the insulating protective layer slurry, the solute includes binders and additives, and the solute comprises the following components by mass percentage: 4-17% binder and 83-96% additives; In the insulating protective layer slurry, the mass of the solvent accounts for 20-60% of the mass of the solute.

7. The high-performance cell structure as described in claim 1 or 6, characterized in that, Regarding the preparation of the insulating protective layer (202), the insulating adhesive is polyvinylidene fluoride (PVDF); Regarding the preparation of the insulating protective layer (202), the insulating additive is ceramic powder or boehmite powder; Regarding the preparation of the insulating protective layer (202), the dispersant for the insulation is NMP.

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