Battery cell, method for manufacturing battery cell, battery and electric device

Abstract

The application relates to a kind of electric core and its preparation method, battery and electric equipment, including electric core main body, the electric core main body includes laminated first pole piece, diaphragm and second pole piece;Tab assembly, the tab assembly includes first tab and second tab, the first tab is connected with first pole piece, and the second tab is connected with second pole piece;Adhesive tape is attached around the electric core main body, the adhesive tape is provided with a let hole, the tab assembly is arranged and is out, the adhesive tape surrounds the electric core main body at least one circle, so that the first pole piece, the diaphragm and the second pole piece are closely attached;The first end and the tail of the adhesive tape are fixedly pasted.The structure is compact, not easy to loosen, facilitates electric core handling, guarantees electric core quality.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery cell and its preparation method, a battery, and an electrical device. Background Technology

[0002] With the rapid development of batteries, energy storage batteries have become an important strategic direction. Currently, to meet market demands for energy storage, the capacity and size of battery cells are increasing, and the width of the cells is also increasing. To reduce the cost of battery cells, PP-based membranes are typically used for separators. However, using PP-based membranes while increasing cell width makes the cells soft and prone to collapse, easily causing overhang defects during cell handling and hindering cell transport.

[0003] Typically, after the battery cell is wound, there is an adhesive application process. This adhesive application refers to applying finishing adhesive to the battery cell along its winding direction after winding. However, this finishing adhesive only serves to seal the winding and cannot solve the problem of the battery cell being loose or collapsing. Although existing technologies also perform a hot-pressing shaping process after battery cell winding to compact the cell, when the battery cell size is large, the hot-pressing shaping process can still result in a relatively loose battery cell. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the technical defects in the prior art where the battery cell is loose, soft and collapses when the size of the battery cell is large, which is not conducive to handling.

[0005] To solve the above-mentioned technical problems, the present invention provides a battery cell, comprising:

[0006] A battery cell body, the battery cell body comprising a wound first electrode, a separator, and a second electrode;

[0007] A tab assembly, the tab assembly including a first tab and a second tab, the first tab being connected to a first electrode plate, and the second tab being connected to a second electrode plate;

[0008] An adhesive tape is wrapped around and attached to the main body of the battery cell. The tape has clearance holes through which the electrode assembly passes. The tape wraps around the main body of the battery cell at least once to ensure that the first electrode, the separator, and the second electrode are tightly bonded. The two ends of the tape are glued and fixed. Along the winding direction, the first electrode, the second electrode, and the separator are wound to form the main body of the battery cell. The wrapping direction of the tape is perpendicular to the winding direction.

[0009] In one embodiment of the present invention, the battery cell body is a cuboid structure, the electrode assembly is disposed on a first surface, the two relatively large surfaces on both sides of the first surface are the second surface and the fourth surface, and the surface opposite to the first surface is the third surface.

[0010] The tape is sequentially wrapped around the first, second, third and fourth surfaces of the battery cell body.

[0011] In one embodiment of the present invention, the tape includes a substrate layer and an adhesive layer; the adhesive layer is located between the substrate layer and the battery cell body, and the adhesive layer includes a first colloid having a preset hardness.

[0012] In one embodiment of the present invention, the first colloid is one of polyvinylidene fluoride, polyvinyl acetate, and polyacrylate.

[0013] In one embodiment of the present invention, the adhesive layer further includes a second adhesive, which is used for bonding and fixing the beginning and end of the tape.

[0014] In one embodiment of the present invention, the adhesive force of the second colloid is greater than that of the first colloid.

[0015] In one embodiment of the present invention, the second colloid is one of acrylate, polyurethane, and polyisoprene.

[0016] In one embodiment of the present invention, the tape is provided with an impregnation area, and the impregnation area is provided with a plurality of holes for impregnating the battery cell with electrolyte.

[0017] In one embodiment of the present invention, a first wetting area is provided on the tape near the tab assembly, and a second wetting area is provided on the tape away from the tab assembly;

[0018] Multiple holes are provided in both the first and second wetting areas to allow electrolyte to be wetted into the battery cell.

[0019] In one embodiment of the present invention, the clearance hole is a contoured structure that projects the tab assembly toward the main body of the battery cell.

[0020] This invention discloses a method for preparing a battery cell, comprising the following steps:

[0021] S1. Obtain a battery cell, the battery cell including a battery cell body and a tab assembly, the battery cell body including a first electrode, a diaphragm and a second electrode wound together, the tab assembly including a first tab and a second tab, the first tab being connected to the first electrode and the second tab being connected to the second electrode;

[0022] S2. Obtain adhesive tape, wherein the adhesive tape has clearance holes;

[0023] S3. Wrap the tape around the battery cell body at least once, so that the clearance holes on the tape fit onto the tab assembly, and the two ends of the tape wrapping around the battery cell body overlap and are pasted and fixed.

[0024] This invention discloses a method for preparing a battery cell, comprising the following steps:

[0025] S1. Obtain a battery cell, the battery cell including a battery cell body and an electrode assembly, a first electrode, a separator and a second electrode are wound to form the battery cell body, the electrode assembly includes a first electrode and a second electrode, the first electrode is connected to the first electrode, and the second electrode is connected to the second electrode;

[0026] S2. Obtain an adhesive tape, wherein the adhesive tape has a clearance hole, and the adhesive tape includes a substrate layer and a first adhesive coated on the substrate layer, wherein the first adhesive has thermoplasticity.

[0027] S3. Heat the tape to keep the first adhesive in a molten state, wrap the tape around the battery cell body at least once, so that the clearance hole on the tape fits onto the tab assembly, and the two ends of the tape are glued and fixed together.

[0028] S4. The first colloid is cooled and cured to fix the tape to the battery cell.

[0029] This invention discloses a battery comprising the above-described battery cell; or comprising a battery cell prepared by the above-described battery cell preparation method.

[0030] This invention discloses an electrical device, including the battery described above.

[0031] The battery cell of the present invention has the following advantages compared with the prior art:

[0032] 1. The present invention uses an adhesive tape that wraps around the main body of the battery cell at least once, with both ends of the tape being glued and fixed. In this way, the tape provides a binding force to the main body of the battery cell, making the first electrode, the separator, and the second electrode fit tightly together, resulting in a compact structure that is not easy to loosen, facilitating the handling of the battery cell and ensuring its quality.

[0033] 2. This invention can prevent overhang defects during cell operation and prevent the R-angle of the cell from rebounding after hot pressing.

[0034] 3. Since the tape has clearance holes and the tab assembly is set in the clearance holes, the reserved tab holes can be used as the standard for judging tab misalignment, which can save the time of manual measurement and judgment of tab misalignment.

[0035] The method for preparing the battery cell of the present invention has the following advantages compared with the prior art:

[0036] 1. In this invention, since the first colloid is thermoplastic, it is in a molten state during the heating process of the tape, which makes it easy for the tape to be attached to the battery cell body. Afterwards, as the first colloid cools and solidifies, it has a preset hardness, thereby strengthening the battery cell and fixing the battery cell body.

[0037] 2. In the cell preparation method of the present invention, since the tape is set and the tape is wrapped around the cell body at least once, and the first and second ends of the tape are attached and fixed, the tape provides a binding force to the cell body, so that the first electrode, the separator and the second electrode are tightly attached, the structure is compact and not easy to loosen. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the battery cell structure;

[0039] Figure 2 This is a schematic diagram of the tape structure;

[0040] Figure 3 This is a schematic diagram of the battery cell structure in this invention.

[0041] Explanation of reference numerals in the accompanying drawings: 10, main body of the battery cell; 11, first surface; 12, second surface; 20, tab assembly; 30, tape; 31, clearance hole; 32, first wetting area; 33, second wetting area. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0043] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that different names may be used to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. Furthermore, terms such as "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In practice, the inventors of this invention have discovered that as the weight and size of the battery cell increase, problems such as loosening, softening, and collapse easily occur, which have a very negative impact on the manufacturing and use of the battery. Specifically, during the battery manufacturing process, loose, soft, and collapsed cells are difficult to handle and affect the reliability of the connection between the cell and the top cover; during battery use, the electrodes of loose, soft, and collapsed cells are not tightly bonded together, thereby reducing the effective electrochemical reaction area, lowering the usable energy density of the battery, and causing misalignment between the sub-tabs, thus reducing the effective current flow area of ​​the battery.

[0045] Reference Figures 1-3 As shown, the present invention discloses a battery cell, including a battery cell body 10, a tab assembly 20, and an adhesive tape 30.

[0046] The cell body 10 includes a wound first electrode, a separator, and a second electrode.

[0047] The cell body 10 can be formed by winding. Specifically, the cell body 10 is formed by winding the first electrode, separator, and second electrode sequentially. In the prior art, because the cell body 10 is formed by winding, when the size of the cell body 10 is large, the cell will be relatively loose, resulting in a battery with low energy density and large overcurrent temperature rise.

[0048] Here, overhang is a type of excess design in the battery manufacturing industry. To prevent short circuits caused by contact between the positive and negative electrodes, the separator must have overhang relative to the positive and negative electrode sheets. In addition, the negative electrode sheet also has overhang requirements relative to the positive electrode sheet.

[0049] The electrode assembly 20 includes a first electrode and a second electrode. The first electrode is connected to a first electrode plate, and the second electrode is connected to a second electrode plate. It should be noted that the first and second electrodes have opposite polarities, with one electrode plate being a positive electrode plate and the other a negative electrode plate. Similarly, the first and second electrodes have opposite polarities, with the electrode plate connected to the positive electrode plate being the positive electrode and the electrode plate connected to the negative electrode plate being the negative electrode. The first electrode includes multiple layers of first sub-electrodes extending in parallel, all with the same polarity. Likewise, the second electrode includes multiple layers of second sub-electrodes extending in parallel, all with the same polarity.

[0050] Adhesive tape 30 is wrapped around and attached to the battery cell body 10. The tape 30 has clearance holes 31 through which the tab assembly 20 passes. The tape 30 wraps around the battery cell body 10 at least once, ensuring a tight fit between the first electrode, the separator, and the second electrode. The tape 30 is fixed at both ends; specifically, the ends can be fixed at the bottom or the side of the battery cell. Two clearance holes 31 can be provided, with the first and second tabs located in the two holes 31 respectively.

[0051] The working principle of this invention is as follows: By setting an adhesive tape 30, along a direction perpendicular to the forming direction of the battery cell body 10, the tape 30 is wrapped around the battery cell body 10 at least once from the tab side to the non-tab side, with the first and last ends of the tape 30 adhered and fixed. In this way, the tape 30 provides a binding force to the battery cell body 10, ensuring a tight fit between the first electrode, separator, and second electrode, resulting in a compact structure that is not easily loosened, facilitating battery cell handling, and ensuring battery cell quality. It should be noted that the "forming direction" refers to the winding direction or stacking direction. This invention can prevent overhang defects during battery cell operation and prevent the R-angle of the separator from rebounding after hot pressing, ensuring tight adhesion of the battery electrodes, high energy density, and low overcurrent temperature rise. Furthermore, since the tape 30 has clearance holes 31, and the tab assembly 20 is disposed in the clearance holes 31, the reserved tab holes can be used as a standard for judging tab misalignment, saving time spent manually measuring and judging tab misalignment.

[0052] Under normal circumstances, it is sufficient to wrap the battery cell body 10 with tape 30 once to secure it. In actual production applications, workers can increase the number of wraps of tape 30 according to the actual production process requirements to achieve the fixation and binding of the battery cell body 10.

[0053] Furthermore, the first electrode, the second electrode, and the separator are wound to form the main body 10 of the battery cell, with the wrapping direction of the tape 30 perpendicular to the winding direction. Since the wrapping direction of the tape 30 is perpendicular to the winding direction of the main body 10 of the battery cell, it can be ensured that the main body 10 of the battery cell is tightly wrapped and will not loosen.

[0054] In one embodiment, the battery cell body 10 has a cuboid structure, and the tab assembly 20 is disposed on the first surface 11. The two relatively large surfaces on both sides of the first surface 11 are the second surface 12 and the fourth surface, respectively, and the third surface is opposite to the first surface 11. Adhesive tape 30 is sequentially wrapped around the first surface 11, the second surface 12, the third surface, and the fourth surface of the battery cell body 10. This wrapping method of the adhesive tape 30 can effectively wrap the battery cell body 10.

[0055] Understandably, regardless of whether the battery cell body 10 is formed by stacking or winding, the outermost layer of the battery cell body 10 is a separator, with the end of the separator located on the second surface 12 or the fourth surface, to prevent short circuits. In the prior art, finishing tape is typically used to adhere the end of the separator to the battery cell body along the forming direction of the battery cell body, thus finishing the entire battery cell body 10. However, since the existing finishing tape only serves as a finishing touch, the bonding area of ​​the finishing tape to the battery cell is small, and since the finishing tape is applied along the forming direction of the battery cell, the binding force on the battery cell is weak, which cannot effectively solve the problem of the battery cell becoming loose and collapsing. In this invention, tape 30 is wrapped around the battery cell body 10 from the tab side to the non-tab side in a direction perpendicular to the forming direction of the battery cell. This not only adheres the end of the separator to the surface of the battery cell body 10, achieving a finishing effect, but also prevents the battery cell body 10 from becoming loose and collapsing.

[0056] Furthermore, the tape 30 includes a substrate layer and an adhesive layer. The adhesive layer is located between the substrate layer and the battery cell body 10, and the adhesive layer includes a first adhesive with a preset hardness. Due to the preset hardness of the first adhesive, the strength of the battery cell body 10 can be enhanced under the action of the first adhesive, and the battery cell body 10 can be well fixed.

[0057] When heated, the first colloid is in a molten state. After the tape 30 is wound around the battery cell body 10, the molten first colloid ensures good adhesion between the tape 30 and the battery cell body 10. After cooling, the first colloid has a preset hardness. After the first colloid cools and solidifies, the structure of the battery cell body 10 is strengthened, thus tightly binding the battery cell body 10. The tape 30 coated with the first colloid can be wound around the second surface 12 and the fourth surface. In this way, the first colloid covers a large area of ​​the battery cell body 10, thereby giving the battery cell greater structural strength.

[0058] Furthermore, the battery cell expands during charging and discharging. The largest areas of the cell, namely the second and fourth surfaces of the cell body 10, experience the most significant expansion. Because the first colloid has a preset hardness, it applies preset pressure to these large areas, thereby mitigating cell expansion and evenly dispersing the expansion force, preventing electrode wrinkling. This invention improves upon existing finishing tapes. Using the tape structure and wrapping method of this invention, there is no need for additional structures or devices to address cell expansion, resulting in lower manufacturing costs.

[0059] Specifically, the first colloid is one of polyvinylidene fluoride, polyvinyl acetate, or polyacrylate. Of course, technicians can also choose other thermoplastic first colloids according to actual needs.

[0060] The adhesive layer also includes a second adhesive, which is used to bond and fix the ends of the tape 30. In order to better fix the battery cell body 10 and prevent the tape 30 from loosening, in this embodiment, the adhesive force of the second adhesive is greater than that of the first adhesive. In this way, the battery cell body 10 can be better bound, and the tape 30 is not easy to loosen even under long-term use and battery vibration conditions.

[0061] Specifically, the second colloid is one of acrylate, polyurethane, or polyisoprene. Of course, technicians can also choose other second colloids with strong adhesive properties according to actual needs.

[0062] In another embodiment, the tape 30 is provided with an impregnation area, and the impregnation area has a plurality of holes for impregnating the battery cell with electrolyte.

[0063] Specifically, a first wetting area 32 is provided on the tape 30 near the tab assembly 20, and a second wetting area 33 is provided on the tape 30 away from the tab assembly 20. Both the first wetting area 32 and the second wetting area 33 have multiple holes to allow electrolyte to be wetted into the battery cell. For example, the first wetting area 32 can be located on the first surface 11 of the aforementioned cuboid-shaped battery cell body 10, and the second wetting area 33 can be located on the third surface of the aforementioned cuboid-shaped battery cell body 10. The shape of the holes in the first and second wetting areas 32 and 33 can be circular, square, or polygonal, as long as it allows the electrolyte to penetrate into the battery cell body 10. The holes can be circular holes with a diameter of 3 mm. Multiple holes can be arranged in an array.

[0064] Of course, the present invention may also omit the wetting area, and the tape 30 may be made of a hydrophilic material, so that the electrolyte can enter the battery cell body 10 through the hydrophilic tape 30.

[0065] In another embodiment, the clearance hole 31 is a contoured structure projected by the tab assembly 20 toward the cell body 10. The size of the clearance hole 31 can be 8-12mm wider than the width of the tab assembly 20, which can accommodate the tab misalignment. At the same time, the reserved clearance hole 31 can be used as a standard for judging the tab misalignment, saving the time of manual measurement and judgment of the tab misalignment. Furthermore, there are two clearance holes 31, with the first tab and the second tab located in the two clearance holes 31 respectively. Specifically, the multi-layered parallel-extending first sub-tabs pass through one clearance hole 31, and the multi-layered parallel-extending second sub-tabs pass through the other clearance hole 31.

[0066] In another embodiment, the present invention discloses a method for preparing a battery cell, comprising the following steps:

[0067] S1. Obtain a battery cell. The battery cell includes a battery cell body 10 and a tab assembly 20. The battery cell body 10 includes a first electrode, a diaphragm, and a second electrode wound together. The tab assembly 20 includes a first tab and a second tab. The first tab is connected to the first electrode and the second tab is connected to the second electrode.

[0068] The battery cell body 10 can be formed by winding. Specifically, the battery cell body 10 is formed by winding the first electrode, the separator, and the second electrode in sequence. In the prior art, because the battery cell body 10 is formed by winding, when the size of the battery cell body 10 is large, the battery cell will have a relatively loose structure.

[0069] S2. Obtain the tape 30, which has a clearance hole 31. The size of the clearance hole 31 matches the size of the tab assembly 20. Specifically, the clearance hole 31 can be a contoured structure of the tab assembly 20 projected toward the cell body 10.

[0070] S3. Wrap the tape 30 around the cell body 10 at least once, so that the clearance hole 31 on the tape 30 is fitted onto the tab assembly 20, and the two ends of the tape 30 wrapped around the cell body 10 overlap and are pasted and fixed.

[0071] In the cell manufacturing method of the present invention, since an adhesive tape 30 is provided, which wraps around the cell body 10 at least once and is fixed at both ends, the adhesive tape 30 provides a binding force to the cell body 10, making the first electrode, the separator, and the second electrode fit tightly together, resulting in a compact structure that is not easily loosened. The present invention can prevent overhang defects during cell operation and prevent the R-angle of the separator from rebounding after hot pressing. Furthermore, since the adhesive tape 30 has clearance holes 31, and the tab assembly 20 is disposed in the clearance holes 31, the reserved tab clearance holes 31 can be used as a standard for judging tab misalignment, saving time spent manually measuring and judging tab misalignment.

[0072] In another embodiment, the present invention discloses a method for preparing a battery cell, comprising the following steps:

[0073] S1. Obtain a battery cell. The battery cell includes a battery cell body 10 and a tab assembly 20. A first electrode, a diaphragm, and a second electrode are wound to form the battery cell body 10. The tab assembly 20 includes a first tab and a second tab. The first tab is connected to the first electrode and the second tab is connected to the second electrode.

[0074] S2. Obtain tape 30. Tape 30 has clearance holes 31. Tape 30 includes a substrate layer and a first adhesive coated on the substrate layer. The first adhesive is thermoplastic.

[0075] S3. Heat the tape 30 to keep the first adhesive in a molten state. Wrap the tape 30 around the battery cell body 10 at least once, so that the clearance holes 31 on the tape 30 fit onto the tab assembly 20, and the two ends of the tape 30 are glued and fixed together. Specifically, a heatable finishing roller is used to heat the finishing adhesive so that the first adhesive on it is kept in a molten state, so that it can have a good adhesion to the battery cell body 10 when it is wrapped around the surface of the battery cell. The first adhesive covers the large surface area of ​​the battery cell body 10, that is, the first adhesive covers the second surface 12 and the fourth surface.

[0076] S4. The first colloid is cooled and cured to fix the tape 30 to the battery cell.

[0077] In this invention, because the first colloid is thermoplastic, it is in a molten state during the heating process of the tape 30. This facilitates the adhesion and bonding of the tape 30 to the battery cell body 10. Subsequently, as the first colloid cools and solidifies, it acquires a preset hardness, thereby strengthening the battery cell and securing the battery cell body 10. Since the first colloid covers a large portion of the battery cell body 10 and has a preset hardness, the battery cell possesses significant structural strength.

[0078] Furthermore, in S3, a second adhesive is provided on the tape 30, which is used to adhere and fix the two ends of the tape 30. The adhesive force of the second adhesive is greater than that of the first adhesive, so the tape 30 can better bind the battery cell body 10.

[0079] This invention discloses a battery comprising the aforementioned battery cell; or, comprising a battery cell prepared by the aforementioned battery cell preparation method. Because the battery comprises the aforementioned battery cell, the battery cell structure is compact, not easily loosened, and has high rigidity, ensuring battery quality and avoiding problems such as misalignment of the anode and cathode plates and overhang defects caused during battery cell operation.

[0080] This invention discloses an electrical device including the aforementioned battery. The main design feature of this invention lies in the structural improvement of the battery cell. Other structural aspects of the electrical device, such as its electrical connections and mechanical components, will not be described in detail.

[0081] Electrical equipment can be various types of electrical devices, such as automobiles, mobile phones, computers, ships, spacecraft, electric toys, and power tools, etc. The embodiments of the present invention do not impose any special limitations on the aforementioned electrical equipment. Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation methods.

[0082] For those skilled in the art, various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this invention.

Claims

1. A battery cell, characterized in that, include: The battery cell body (10) includes a first electrode, a diaphragm, and a second electrode wound together. A tab assembly (20) includes a first tab and a second tab, wherein the first tab is connected to a first electrode plate and the second tab is connected to a second electrode plate; Adhesive tape (30) is wrapped around and attached to the battery cell body (10). The adhesive tape (30) has a clearance hole (31) through which the electrode assembly (20) passes. The adhesive tape (30) wraps around the battery cell body (10) at least once to make the first electrode, the diaphragm and the second electrode fit tightly together. The two ends of the adhesive tape (30) are glued and fixed. Along the winding direction, the first electrode, the second electrode, and the diaphragm are wound to form the battery cell body (10), and the wrapping direction of the tape (30) is perpendicular to the winding direction.

2. The battery cell according to claim 1, characterized in that, The main body (10) of the battery cell is a cuboid structure, and the tab assembly (20) is disposed on the first surface (11). The relatively large surfaces on both sides of the first surface (11) are the second surface (12) and the fourth surface, respectively, and the third surface is opposite to the first surface (11). The tape (30) is wrapped around the first surface (11), second surface (12), third surface and fourth surface of the battery cell body (10) in sequence.

3. The battery cell according to claim 1, characterized in that, The tape (30) includes a substrate layer and an adhesive layer; the adhesive layer is located between the substrate layer and the battery cell body (10), and the adhesive layer includes a first adhesive with a preset hardness.

4. The battery cell according to claim 3, characterized in that, The first colloid is one of polyvinylidene fluoride, polyvinyl acetate, and polyacrylate.

5. The battery cell according to claim 3, characterized in that, The adhesive layer also includes a second adhesive, which is used to bond and fix the ends of the tape (30).

6. The battery cell according to claim 5, characterized in that, The adhesive force of the second colloid is greater than that of the first colloid.

7. The battery cell according to claim 5, characterized in that, The second colloid is one of acrylate, polyurethane, and polyisoprene.

8. The battery cell according to claim 1, characterized in that, The tape (30) is provided with an impregnation area, and the impregnation area is provided with a plurality of holes for impregnating the electrolyte into the battery cell.

9. The battery cell according to claim 1, characterized in that, A first wetting area (32) is provided on the tape (30) near the tab assembly (20), and a second wetting area (33) is provided on the tape (30) away from the tab assembly (20); Multiple holes are provided on the first wetting area (32) and the second wetting area (33) to wet the electrolyte into the battery cell.

10. The battery cell according to claim 1, characterized in that, The clearance hole (31) is a contour structure of the tab assembly (20) projected toward the cell body (10).

11. A method for preparing a battery cell, characterized in that, Includes the following steps: S1. Obtain a battery cell, the battery cell including a battery cell body (10) and a tab assembly (20), the battery cell body (10) including a first electrode, a diaphragm and a second electrode wound together, the tab assembly (20) including a first tab and a second tab, the first tab being connected to the first electrode and the second tab being connected to the second electrode; S2. Obtain the tape (30), wherein the tape (30) is provided with a clearance hole (31); S3. Wrap the tape (30) around the cell body (10) at least once, so that the clearance hole (31) on the tape (30) is fitted onto the tab assembly (20). The tape (30) is wrapped around the cell body (10) and the two ends overlap and are pasted and fixed. The first electrode, the second electrode and the diaphragm are wound to form the cell body (10) along the winding direction. The wrapping direction of the tape (30) is perpendicular to the winding direction.

12. A method for preparing a battery cell, characterized in that, Includes the following steps: S1. Obtain a battery cell, the battery cell including a battery cell body (10) and a tab assembly (20), a first electrode, a diaphragm and a second electrode are wound to form the battery cell body (10), the tab assembly (20) includes a first tab and a second tab, the first tab is connected to the first electrode, and the second tab is connected to the second electrode; S2. Obtain tape (30), the tape (30) having a clearance hole (31) and the tape (30) including a substrate layer and a first adhesive coated on the substrate layer, the first adhesive being thermoplastic; S3. Heat the tape (30) so that the first adhesive remains in a molten state. Wrap the tape (30) around the battery cell body (10) at least once so that the clearance hole (31) on the tape (30) is fitted onto the tab assembly (20) and the two ends of the tape (30) are glued and fixed together. S4. The first colloid is cooled and cured to fix the tape (30) to the battery cell.

13. A battery, characterized in that, It includes the battery cell according to any one of claims 1-10; or, it includes the battery cell prepared by the battery cell preparation method according to claim 11 or 12.

14. An electrical appliance, characterized in that, Includes the battery as described in claim 13.

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