Battery monomer, battery and electric equipment

Abstract

The invention discloses a battery monomer, a battery and electric equipment. The battery monomer comprises an electrode assembly, an insulation protection sheet and a shell, the electrode assembly and the insulation protection sheet are accommodated in the shell, an opening is formed in one end of the shell in the first direction, the insulation protection sheet is used for wrapping the electrode assembly, the insulation protection sheet and the electrode assembly jointly form a liquid climbing channel, and at least part of the liquid climbing channel extends in the first direction; the liquid climbing channel is located on the surface of the insulation protection sheet close to the electrode assembly. According to the battery monomer, the battery and the electric equipment, the liquid climbing channel is jointly formed by the insulating protection sheet and the electrode assembly, and the electrolyte can climb upwards through the liquid climbing channel to reach the top of the electrode assembly in the initial infiltration and circulating infiltration processes of the battery monomer by utilizing a capillary effect principle; the problem of lithium precipitation in a thinned region or large surface of the electrode assembly due to insufficient electrolyte at the top is avoided, the probability of lithium precipitation at the edge of the top is greatly reduced, and the service life and the performance of the battery monomer are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0002] With the rapid development of the battery industry, the safety requirements of power cells are becoming higher and higher. As the energy density of the cells increases, the volume of the single cell also increases. Because the volume of the cell increases, the process of electrolyte penetration takes longer, which leads to great challenges in the safety of the cell and the infiltration performance of the later cycle. SUMMARY

[0003] In view of the above problems, the present application provides a battery monomer, a battery and an electric device.

[0004] In a first aspect, the present application provides a battery monomer, comprising an electrode assembly, an insulating protective sheet and a shell, the electrode assembly and the insulating protective sheet are contained in the shell, the shell is formed with an opening at one end along a first direction, the insulating protective sheet is used to wrap the electrode assembly, and the insulating protective sheet and the electrode assembly jointly form a liquid climbing channel, the liquid climbing channel extends at least partially along the first direction, and the liquid climbing channel is located on the surface of the insulating protective sheet close to the electrode assembly.

[0005] In the technical scheme of the present application, the insulating protective sheet used to wrap the electrode assembly and the electrode assembly jointly form a liquid climbing channel, which utilizes the principle of capillary effect to make the electrolyte climb upward to the top of the electrode assembly through the liquid climbing channel during the initial infiltration and the cycle infiltration process, thereby avoiding the problems of lithium precipitation in the thinned area of the electrode assembly or lithium precipitation on the large surface due to insufficient electrolyte at the top, greatly reducing the probability of lithium precipitation at the top edge, and improving the life and performance of the battery monomer.

[0006] In some embodiments, the insulating protective sheet is provided with a notch, and the notch and the electrode assembly jointly form the liquid climbing channel.

[0007] In the above technical scheme, by providing a notch in the insulating protective sheet, the notch and the electrode assembly jointly form a liquid climbing channel, which can more effectively guide the flow of electrolyte during the infiltration process and ensure that each part of the electrode assembly is fully infiltrated. In addition, the notch in the insulating protective sheet can improve the internal space of the battery monomer and to some extent improve the problem of battery liquid injection and overflow.

[0008] In some embodiments, the width of the notch in a second direction is greater than 0 and less than or equal to 5 cm, the second direction is parallel to the surface of the insulating protective sheet and intersects the first direction.

[0009] In the above technical solution, the width of the notch in the second direction is not particularly limited but is less than or equal to 5 cm. If the width of the notch is too large, it will result in the inability to generate a capillary effect.

[0010] In some embodiments, the depth of the notch in the third direction is greater than 0 and less than or equal to 8 mm, the third direction is parallel to the thickness direction of the insulating protective sheet, and the first direction, the second direction, and the third direction are not coplanar and intersect with each other.

[0011] In the above technical solution, the depth range is set based on the requirements of the infiltration efficiency and the feasibility of the manufacturing process. Although a deeper notch has a stronger capillary effect and can more effectively guide the electrolyte to infiltrate the electrode assembly, a too deep notch will increase the manufacturing difficulty and cost, and also affect the overall structural stability of the battery cell.

[0012] In some embodiments, along the first direction, the depth of the notch in the third direction gradually decreases.

[0013] In the above technical solution, when the depth of the notch in the third direction gradually decreases along the first direction, the electrolyte will undergo a change from deep to shallow during the infiltration process. The deeper notch can guide the electrolyte to flow faster at the initial stage, and the gradually shallower notch can slow down the infiltration speed. This change helps to ensure that the electrolyte is more evenly distributed on the electrode assembly, avoiding the situation of excessive infiltration at the bottom area or insufficient infiltration at the top area of the electrode assembly.

[0014] In some embodiments, the notch includes a plurality of notches, and the plurality of notches are arranged at intervals along the second direction, the second direction is parallel to the surface of the insulating protective sheet and intersects with the first direction.

[0015] In the above technical solution, the interval arrangement of the multiple notches increases the contact area between the electrolyte and the insulating protective sheet, and also prevents the situation of uneven distribution of electrolyte caused by too many notches in the local area of the insulating protective sheet.

[0016] In some embodiments, at least part of the notches have a different width in the second direction than the other notches.

[0017] In the above technical solution, in different parts of the electrode assembly, notches of different widths can be designed according to the structure and performance requirements. In areas where rapid infiltration is required, the width and number of notches can be increased to speed up the flow of electrolyte. In areas where the infiltration is excessive, the width of the notch can be reduced to slow down the flow of electrolyte, ensuring that the electrolyte can be evenly distributed on the entire electrode assembly during the infiltration process, avoiding the situation of insufficient or excessive infiltration.

[0018] In some embodiments, the depth of at least some of the indentations in a third direction is different from the depth of other indentations in the third direction, the third direction being parallel to the thickness direction of the insulation protection sheet, the first direction, the second direction and the third direction being non-coplanar and intersecting with each other.

[0019] In the above technical solution, by designing indentations with different depths, liquid climbing channels with different capillary effect characteristics can be formed. Deeper indentations have stronger surface tension and can more effectively guide the electrolyte to infiltrate the electrode assembly; while shallower indentations can provide a more uniform infiltration layer on the surface of the electrode assembly.

[0020] In some embodiments, the roughness of the indentations is greater than 3.2.

[0021] In the above technical solution, rough indentations can increase the effective surface area, increase the contact area with the electrolyte, enhance the capillary effect, and make it easier for the electrolyte to be absorbed into the indentations, thereby improving the infiltration effect of the electrolyte and the performance of the battery.

[0022] In some embodiments, the projection of the indentations in a third direction is at least one of a straight line, a tree cluster, a polyline, a curve, a rhombus, a square, and a circle, the third direction being parallel to the thickness direction of the insulation protection sheet.

[0023] In the above technical solution, the shape refers to the shape of the projection of the indentation in the third direction. The indentation is in a straight line shape, which is simple and clear in structure, easy to manufacture, and suitable for occasions that require electrolyte to quickly infiltrate in a specific direction. The indentation is in a tree cluster shape, the indentation shape is similar to the branches of a tree, has multiple branches and nodes, and helps to form a more complex infiltration network inside the electrode assembly, improving the infiltration efficiency. The indentation is in a polyline shape, the indentation is composed of multiple straight line segments, the direction changes, forming a polyline, which is conducive to guiding the electrolyte to flow in a specific path while increasing the infiltration area. The indentation is in a curve shape, such as a circular arc or a wavy line, which helps to reduce resistance during the infiltration process and makes the electrolyte flow more smoothly. The indentation is in a rhombus or square shape, which has a regular geometric boundary and is suitable for occasions that require precise control of the infiltration area, and also has a specific effect on the flow of electrolyte. The indentation is in a circular shape, which has uniform curvature and no sharp corners, which helps to reduce stress concentration and bubble generation during the infiltration process.

[0024] In some embodiments, the insulation protection sheet includes a plurality of protrusions, the plurality of protrusions are arranged at intervals along a second direction, and adjacent two of the protrusions and the electrode assembly together form the liquid climbing channel, the second direction being parallel to the surface of the insulation protection sheet and intersecting with the first direction.

[0025] In the above technical solution, the liquid climbing channel can also be formed between two protruding parts. When the electrolyte enters the liquid climbing channel formed by the adjacent two protruding parts and the electrode assembly, the electrolyte will also be affected by the surface tension and accelerate the infiltration process. In addition, through the design of multiple protruding parts of the insulating protective sheet, when the electrode assembly starts to swell, the protruding parts can resist the main surface of the electrode assembly, limiting its excessive swelling, thereby solving the problem of battery charging and swelling.

[0026] In some embodiments, the height of the protruding part in the third direction is greater than 0 millimeters and less than or equal to 3 centimeters, and the first direction, the second direction, and the third direction are not coplanar and intersect with each other.

[0027] In the above technical solution, the height needs to be reasonably set. If the height of the protruding part in the third direction is too high, the electrolyte cannot be fully infiltrated in some areas, forming an infiltration dead angle. If the height is too low, the electrolyte cannot flow effectively, resulting in uneven infiltration.

[0028] In some embodiments, the height of at least part of the protruding part is different from the height of other protruding parts.

[0029] In the above technical solution, by adjusting the height of the protruding part in different areas, the electrolyte can be guided to infiltrate the electrode assembly along a predetermined path and speed. This differentiated design helps to achieve more uniform and efficient infiltration.

[0030] In some embodiments, along the first direction, the height of the protruding part in the third direction gradually decreases.

[0031] In the above technical solution, the height of the protruding part gradually decreases along the first direction, which can form a natural inclined surface to guide the electrolyte to flow in this direction. This design helps to reduce the resistance in the infiltration process, making the electrolyte more smoothly infiltrate into each part of the electrode assembly.

[0032] In some embodiments, at least part of the protruding part in the second direction is different from the width of other protruding parts in the second direction.

[0033] In the above technical solution, different width of the protruding part can affect the infiltration path and speed of the electrolyte. The wider protruding part can provide more infiltration area, while the narrower protruding part can guide the electrolyte to pass through some areas faster. By adjusting the width of the protruding part, the infiltration effect of the electrolyte can be optimized to ensure uniformity and efficiency of infiltration.

[0034] In some embodiments, the width of the protruding part in the second direction is greater than 0 and less than 2 centimeters.

[0035] In the above technical solution, the width of the protruding part directly affects the infiltration path and area of the electrolyte. An appropriate width can ensure that the electrolyte can fully infiltrate into the pores of the electrode assembly, improving the infiltration efficiency and uniformity. A too wide protruding part will increase the manufacturing difficulty and cost; while a too narrow protruding part is difficult to accurately process and control the size.

[0036] In some embodiments, the width of the interval between at least some adjacent protruding parts is different from the width of the interval between other adjacent protruding parts.

[0037] In the above technical solution, different interval widths can affect the infiltration path of the electrolyte. By adjusting the interval width, the electrolyte can be guided to infiltrate along a specific path, thereby improving the infiltration efficiency and uniformity. The differentiated interval width design can ensure that the electrolyte can fully infiltrate into all key areas.

[0038] In some embodiments, the width of the interval between adjacent protruding parts is greater than 0 and less than or equal to 5 cm.

[0039] In the above technical solution, the interval width directly affects the infiltration path and efficiency of the electrolyte. An appropriate interval can ensure that the electrolyte can flow smoothly and infiltrate into the electrode assembly, thereby improving the performance of the battery.

[0040] In some embodiments, the protruding part is provided with a notch, and the notch extends at least partially along the first direction.

[0041] In the above technical solution, the notch can serve as a guide path for electrolyte infiltration, helping the electrolyte to penetrate more uniformly into the battery. This design can improve the infiltration efficiency of the electrolyte, ensuring that the electrode material is fully infiltrated, thereby improving the performance of the battery. The notch increases the complexity of the surface of the protruding part, providing more infiltration points or surface area, so that the electrolyte can more fully contact the electrode material.

[0042] In some embodiments, the projection of the protruding part in the third direction is at least one of a rectangle, a polyline, a curve, and a circle, and the first direction, the second direction, and the third direction are not coplanar and intersect with each other.

[0043] In the above technical solution, the two-dimensional shape refers to the projection shape of the protruding part in the third direction. The rectangular protruding part has a simple shape, is easy to process and manufacture, has clear edges, can provide clear infiltration paths and support points, and can form good alignment and cooperation with other structures (such as electrode sheets). The fold line-shaped protruding part has a complex shape with multiple turning points and edges. It can provide multiple infiltration paths and support points, which helps to optimize the infiltration effect of the electrolyte. The curved protruding part has a smooth curved profile, which can reduce friction and stress concentration, and improve the stability and durability of the structure. The curved design can also improve the flowability and infiltration effect of the electrolyte. The cylindrical protruding part has a shape similar to a cylinder with a clear diameter and height. It can provide stable support and clear infiltration paths. The cylindrical design can also increase the surface area of the protruding part and improve the contact efficiency with the electrolyte.

[0044] In some embodiments, the insulating protective sheet includes an insulating body, a thickness direction of the insulating body is perpendicular to the first direction, and the liquid climbing channel is located on the insulating body.

[0045] In the above technical solution, the insulating body is the main part of the insulating protective sheet that wraps all sides of the electrode assembly, and is made of Mylar film as the material. The surface of the Mylar film is smooth and easy to process, which facilitates the engraving of the liquid climbing channel on the surface of the Mylar film. Through precise laser etching or mechanical processing technology, fine notches can be formed on the Mylar film, which can be used to form the liquid climbing channel.

[0046] In some embodiments, the insulating protective sheet further includes a connecting part, at least one end of the insulating body along the first direction is connected with the connecting part, the thickness direction of the connecting part is parallel to the thickness direction of the insulating body, the liquid climbing channel is also located on the connecting part, and the liquid climbing channel of the insulating body and the liquid climbing channel of the connecting part are in communication.

[0047] In the above technical solution, the connecting part is the part of the insulating protective sheet located above the top of the electrode assembly, which serves to connect the insulating body and is also provided with a liquid climbing channel, and is in communication with the liquid climbing channel of the insulating body. The communication design enables the electrolyte to cover the entire electrode assembly more quickly, improving the infiltration efficiency.

[0048] In some embodiments, the connecting part is integrally formed with the insulating body.

[0049] In the above technical solution, the integral molding is a manufacturing process, and the integral molding process directly combines multiple components originally manufactured separately into one whole during the manufacturing process, thereby simplifying the production process, improving production efficiency, and reducing problems caused by poor connection between components. After the integral molding process combines the insulating body and the connecting portion into the insulating protective sheet, a space is left inside the insulating protective sheet, which can be used to accommodate the electrode assembly, and a proper gap is maintained between the electrode assembly and the insulating protective sheet, so that the electrolyte can flow and infiltrate smoothly.

[0050] In a second aspect, the application also provides a battery device, which comprises any one of the battery monomers described above.

[0051] In the above technical solution, the battery device is formed by connecting and packaging multiple battery monomers in a specific manner. The battery device composed of the above battery monomers sets a liquid climbing channel on the insulating protective sheet, and uses the capillary effect principle to make the electrolyte climb upward to the top of the electrode assembly through the liquid climbing channel set on the insulating protective sheet during the initial infiltration and cyclic infiltration process, thereby avoiding the problem of lithium precipitation in the thinned area or large-area lithium precipitation of the electrode assembly due to insufficient electrolyte at the top, reducing the safety hazards such as short circuit and liquid leakage of the battery device, and increasing the service life of the battery device. At the same time, the restraint of the protruding portion on the insulating protective sheet on the electrode assembly prevents the battery device from swelling and wrinkling during the charging process, further improving the safety of the battery device.

[0052] In a third aspect, the application also provides an electric equipment, which comprises the battery device or any one of the battery monomers described above.

[0053] In the above technical solution, the battery device or any one of the battery monomers can be used as a power supply for the electric equipment. The electric equipment using the above battery device or any one of the battery monomers as a power supply will have significant advantages in safety, stability, high efficiency, and prolonging the service life, which helps to improve the user experience.

[0054] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0055] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation of the application. Moreover, in the entire drawings, the same reference numerals are used for the same components. In the drawings:

[0056] Figure 1 Structure diagram of the electrode assembly with the insulating protection sheet for some embodiments of the present application;

[0057] Figure 2 Front view diagram of the battery cell for some embodiments of the present application;

[0058] Figure 3 Exploded view diagram of the battery cell for some embodiments of the present application;

[0059] Figure 4 Diagram of the liquid climbing path on the electrode assembly for some embodiments of the present application;

[0060] Figure 5 Planar structure diagram of the insulating protection sheet for some embodiments of the present application;

[0061] Figure 6 Structure diagram of the insulating protection sheet with indentations for some embodiments of the present application;

[0062] Figure 7 Structure diagram of the insulating protection sheet with indentations for some embodiments of the present application;

[0063] Figure 8 Structure diagram of the insulating protection sheet with indentations for some embodiments of the present application;

[0064] Figure 9 Structure diagram of the insulating protection sheet with indentations for some embodiments of the present application;

[0065] Figure 10 Structure diagram of the insulating protection sheet with indentations for some embodiments of the present application;

[0066] Figure 11 Structure diagram of the insulating protection sheet for some embodiments of the present application;

[0067] Figure 12 Structure diagram of the insulating protection sheet with protrusions for some embodiments of the present application;

[0068] Figure 13 Structure diagram of the insulating protection sheet with protrusions and indentations for some embodiments of the present application;

[0069] Figure 14 Structure diagram of the insulating protection sheet with protrusions for some embodiments of the present application;

[0070] Figure 15 Structure diagram of the insulating protection sheet with protrusions for some embodiments of the present application;

[0071] Figure 16 Structure diagram of the fourth embodiment of the insulating protection sheet with the protruding part.

[0072] Reference signs:

[0073] Battery cell 100, electrode assembly 10, insulating protection sheet 20, insulating body 21, connecting part 22, shell 30, shell cover 31, shell body 32, liquid channel 40, indentation 41, protruding part 50, first direction X, second direction Y, third direction Z, width D1 of indentation, depth D2 of indentation, height D3 of protruding part, width D4 of protruding part, interval width D5 between protruding parts. DETAILED DESCRIPTION

[0074] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0076] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0077] In this paper, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0078] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, X and / or Y, which means that there are three cases of X alone, X and Y together, and Y alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0079] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0080] In the description of the embodiments of the present application, the technical terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements 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 embodiments of the present application.

[0081] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0082] In related battery designs, if the size of the cell is too large or too high, and the amount of electrolyte is relatively limited, then during the infiltration process, the electrolyte may not be able to completely cover the top area of the electrode assembly. This will cause insufficient electrolyte in the top area, and further cause the problem of thinning area lithium deposition or large area lithium deposition.

[0083] Thinning area lithium deposition usually occurs at the edge of the electrode assembly or the part with thinner thickness, because the electrolyte concentration in these areas is lower or unevenly distributed, so that lithium ions are prone to form lithium dendrites or lithium metal layer during deposition. Large area lithium deposition refers to the phenomenon of lithium deposition in a large area on the top of the entire electrode assembly. Both of these two lithium deposition phenomena will seriously damage the performance and life of the battery.

[0084] Therefore, please refer to Figures 1-4 , in a first aspect, the present application provides a battery monomer 100, the monomer battery 100 includes an electrode assembly 10, an insulating protective sheet 20 and a shell 30, the shell 30 includes a shell cover 31 and a shell body 32. The electrode assembly 10 and the insulating protective sheet 20 are contained in the shell body 32, and the shell body 32 is formed with an opening at one end along the first direction X, and the insulating protective sheet 20 is used to wrap the electrode assembly 10, and the insulating protective sheet 20 and the electrode assembly 10 jointly form a liquid climbing channel 40, the liquid climbing channel 40 at least partially extends along the first direction X, the first direction X isFigure 1 From the bottom to the top of the electrode assembly 10, in the direction from bottom to top, the wicking channel 40 is located on the surface of the insulating protective sheet 20 close to the electrode assembly 10.

[0085] The present application forms the wicking channel 40 by the insulating protective sheet 20 and the electrode assembly 10 together, uses the principle of capillary effect, so that the electrolyte can climb up to the top of the electrode assembly 10 through the wicking channel 40 in the initial wetting and cyclic wetting process of the battery monomer 100, avoids the problem of lithium precipitation in the thinned area or large area of the electrode assembly 10 due to insufficient electrolyte at the top, greatly reduces the probability of lithium precipitation at the top edge, and improves the life and performance of the battery monomer 100.

[0086] It should be noted that capillary effect is a physical phenomenon that occurs when a liquid comes into contact with a solid surface, especially when a liquid comes into contact with a solid surface with small pores or channels. When a liquid comes into contact with such a solid surface, the liquid will exhibit an upward or downward phenomenon in these small pores or channels, depending on the interaction force between the liquid and the solid surface. There is a force on the surface of the liquid that minimizes the surface area, called surface tension. In a capillary tube or small channel, the surface tension acts on the contact surface between the liquid and the channel wall, generating a force pointing to the inside of the channel.

[0087] The electrode assembly 10 is the core part of the battery monomer 100, including positive electrode, negative electrode and separator film and other key components. The material of the separator film is not limited, for example, it can be polypropylene or polyethylene, etc. The positive electrode tab can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as the positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. In order to ensure that no fusing occurs when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The electrode assembly 10 can be a laminated structure, and the embodiments of the present application are not limited thereto.

[0088] The positive and negative electrode plates and the separator inside the electrode assembly 10 are all porous structures, which can be equivalent to capillary structures with different porosities. The infiltration process of the electrolyte in the porous positive and negative electrodes and the separator can be understood as a capillary absorption effect.

[0089] The speed of the electrolyte climbing depends on the capillary penetration effect, and the Lucas-Washburn penetration model is used to describe the liquid absorption kinetics of the electrode plate. As shown in equations (1) and (2):

[0090]

[0091] Where t represents the infiltration time, h represents the infiltration height, K represents the infiltration rate; θ represents the contact angle between the solid-liquid surface, r represents the capillary pore radius, η represents the viscosity of the electrolyte, and σ is the surface tension of the liquid.

[0092] The gap between the insulating protective sheet 20 and the electrode plate can be increased by providing the climbing channel 40 on the insulating protective sheet 20, i.e., r in the formula is increased, the infiltration rate is proportional to the gap, the infiltration rate is significantly improved, the electrode plate expands after the electrode assembly 10 is charged, and the electrolyte in the climbing channel 40 on the insulating protective sheet 20 is squeezed to the top of the electrode assembly 10 or is partially absorbed during the contact process, thereby enabling better infiltration of the electrode assembly 10. Thus, based on the capillary penetration model, the climbing efficiency is improved by increasing the gap, and the infiltration process is improved.

[0093] Thus, the climbing channel 40 is provided on the insulating protective sheet 20 by using the capillary effect, the climbing channel 40 is arranged at a certain interval and depth, forming a series of small, interconnected channel networks, to ensure that sufficient surface tension can be generated during the electrolyte infiltration process, so that the electrolyte can smoothly climb along these channels.

[0094] Illustratively, when the battery cell 100 begins to be infiltrated, the electrolyte first contacts the climbing channel 40 on the insulating protective sheet 20. Due to the small size and geometric shape of the notch, the electrolyte generates a significant capillary effect in the channel. The capillary effect enables the electrolyte to spontaneously climb up the channel without external pressure. As the electrolyte continues to infiltrate, the capillary effect continuously transports the electrolyte from the bottom to the top until the entire electrode assembly 10 is completely infiltrated.

[0095] By using the climbing channel 40 in the present application, it can be ensured that even in the case of a large size of the electrode assembly 10 or a relatively small amount of electrolyte consumed in the subsequent circulation process, the electrolyte can be smoothly climbed to the top area of the electrode assembly 10 by the capillary effect. In this way, the problem of lithium precipitation caused by insufficient electrolyte at the top can be effectively avoided, thereby improving the safety and service life of the battery.

[0096] Referring to Figure 5 and Figure 6 In some embodiments, the insulating protective sheet 20 is provided with a notch 41, and the notch 41 cooperates with the electrode assembly 10 to form a liquid climbing channel 40.

[0097] By providing the notch 41 on the insulating protective sheet 20, the notch 41 cooperates with the electrode assembly 10 to form the liquid climbing channel 40, so that the electrolyte can be more effectively guided to flow during the soaking process, and ensure that each part of the electrode assembly 10 can be fully soaked. The notch 41 is designed by mechanical or laser marking during the processing of the insulating protective sheet 20, or by using a film tool to make an indentation.

[0098] In addition, the notch 41 provided on the insulating protective sheet 20 can increase the internal space of the battery monomer 100, and to a certain extent, improve the problem of liquid injection overflow of the battery. The problem of liquid injection overflow refers to that during the production process of the battery, the staff uses the liquid injection process to inject a specified amount of electrolyte into the battery, the internal space of the battery monomer 100 is insufficient, and the injection amount is too large, so that the height of the electrolyte in the battery exceeds the rated height to cause overflow, which seriously damages the performance of the battery.

[0099] Exemplarily, after the notch 41 is provided on the insulating protective sheet 20, the liquid absorption path of the electrode assembly 10 is increased, the internal space of the battery monomer 100 is increased, the liquid injection efficiency is increased by 10%, the liquid climbing rate of the electrolyte is increased by 10%, so that the soaking time of the battery is shortened by 20%, the soaking capacity is increased, and the failure rate of soaking is reduced by more than 30%.

[0100] In some embodiments, the width D1 of the notch 41 in the second direction Y is greater than 0 and less than or equal to 5 cm, the second direction Y is parallel to the surface of the insulating protective sheet 20, and intersects the first direction X.

[0101] The second direction Y is Figure 6 The width D1 of the notch 41 in the second direction Y is, for example, 1 mm, 1.5 mm, 2 mm, 5 mm, 8 mm, 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm, 3.5 cm, 4 cm or 4.5 cm, and the like, that is, the width D1 of the notch 41 in the second direction Y is not particularly limited, and if the width of the notch 41 is too large, the capillary effect cannot be generated.

[0102] In some embodiments, the depth D2 of the notch 41 in the third direction Z is greater than 0 and less than or equal to 8 mm, the third direction Z is parallel to the thickness direction of the insulating protective sheet 20, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect each other.

[0103] The third direction Z is Figure 6The thickness direction of the insulating protective sheet 20 is parallel, running from top to bottom. The depth D2 of the indentation 41 in the third direction Z is less than or equal to 8 mm. This depth range is set based on the requirements of wetting efficiency and the feasibility of the manufacturing process. Although a deeper indentation 41 has a stronger capillary effect and can more effectively guide the electrolyte to wet the electrode assembly 10, an excessively deep indentation 41 will increase the manufacturing difficulty and cost, and will also affect the overall structural stability of the battery cell 100.

[0104] Please see Figure 6 In some embodiments, along the first direction X, the depth D2 of the indentation 41 in the third direction Z gradually decreases.

[0105] As the depth D2 of the indentation 41 in the third direction Z gradually decreases along the first direction X, the electrolyte undergoes a process of changing from deep to shallow during the wetting process. The deeper indentation 41 can guide the electrolyte flow faster in the initial stage, while the gradually shallower indentation 41 can slow down the wetting speed. This change helps to ensure that the electrolyte is more evenly distributed on the electrode assembly 10, avoiding over-wetting in the bottom area or insufficient wetting in the top area of ​​the electrode assembly 10.

[0106] In some embodiments, the indentation 41 includes multiple indentations arranged at intervals along a second direction Y. The second direction Y is parallel to the surface of the insulating protective sheet 20 and intersects with the first direction X.

[0107] The spaced arrangement of multiple indentations 41 increases the contact area between the electrolyte and the insulating protective sheet 20, and can also prevent uneven electrolyte distribution caused by excessive local indentations 41 on the insulating protective sheet 20.

[0108] Please see Figure 6 In some embodiments, at least some of the indentations 41 have a width in the second direction Y that is different from the width D1 of the other indentations 41 in the second direction Y.

[0109] In different parts of the electrode assembly 10, indentations 41 of different widths can be designed according to their structure and performance requirements. In areas where rapid wetting is required, the width D1 and number of indentations 41 can be increased to accelerate the flow rate of the electrolyte. In areas where wetting is excessive, the width D1 of indentations 41 can be reduced to slow down the flow of the electrolyte, ensuring that the electrolyte can be evenly distributed on the entire electrode assembly 10 during the wetting process, and avoiding insufficient or excessive wetting.

[0110] Please see Figure 6In some embodiments, the depth D2 of the at least partial indentation 41 in the third direction Z is different from the depth D2 of the other indentations 41 in the third direction Z, the third direction Z being parallel to the thickness direction of the insulation protection sheet 20, the first direction X, the second direction Y and the third direction Z are not coplanar and intersect with each other.

[0111] Thus, by designing the indentations 41 with different depths, the wicking channels 40 with different capillary effect characteristics can be formed. The deeper indentations 41 have stronger surface tension and can more effectively guide the electrolyte to infiltrate the electrode assembly 10; while the shallower indentations 41 can provide a more uniform infiltration layer on the surface of the electrode assembly 10.

[0112] Please refer to Figure 6 In some embodiments, the roughness of the indentation 41 is greater than 3.2.

[0113] It should be noted that the roughness refers to the surface roughness, which refers to the unevenness of the small pitch and micro peaks and valleys of the processed surface. The morphology features with a wavelength less than 1 millimeter are generally attributed to the surface roughness. The smaller the surface roughness, the smoother the surface.

[0114] The roughness of the indentation 41 may, for example, be 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9 or 4.0. The rough indentation 41 can increase the effective surface area, which can increase the contact area with the electrolyte, thereby enhancing the capillary effect, making it easier for the electrolyte to be absorbed into the indentation 41, and being beneficial to improve the infiltration effect of the electrolyte and the battery performance.

[0115] Please refer to Figures 7-10 In some embodiments, the projection of the indentation 41 in the third direction Z is at least one of a straight line, a tree cluster, a polyline, a curve, a rhombus, a square, and a circle, the third direction Z being parallel to the thickness direction of the insulation protection sheet 20.

[0116] It should be noted that the shape here refers to the shape of the projection of the indentation 41 in the third direction Z. The indentation 41 is linear, simple and clear in structure, easy to manufacture, and suitable for occasions that require electrolyte to quickly infiltrate in a specific direction. The indentation 41 is in the shape of a tree cluster, similar to the branches of a tree, with multiple branches and nodes, which helps to form a more complex infiltration network inside the electrode assembly 10 and improve the infiltration efficiency. The indentation 41 is in the shape of a polyline, which is composed of multiple straight line segments with different directions, forming a polyline, which is conducive to guiding the electrolyte to flow in a specific path while increasing the infiltration area. The indentation 41 is in the shape of a curve, such as a circular arc or a wavy line, which helps to reduce resistance during infiltration and make the electrolyte flow more smoothly. The indentation 41 is in the shape of a rhombus or a square, with regular geometric boundaries, suitable for occasions that require precise control of the infiltration area, and will also have a specific effect on the flow of electrolyte. The indentation 41 is in the shape of a circle, which has the characteristics of uniform curvature and no sharp corners, which helps to reduce stress concentration and bubble generation during infiltration.

[0117] Please refer to Figure 11 and Figure 12 In some embodiments, the insulating protective sheet 20 includes a plurality of protrusions 50, which are arranged at intervals along the second direction Y, and adjacent two protrusions 50 form a wicking channel 40 together with the electrode assembly 10. The second direction Y is parallel to the surface of the insulating protective sheet 20 and intersects the first direction X.

[0118] Thus, the wicking channel 40 can also be formed between two protrusions 50, and when the electrolyte enters the wicking channel 40 formed by the adjacent two protrusions 50 and the electrode assembly 10, it will also be affected by the surface tension to accelerate the infiltration process.

[0119] In addition, if the battery monomer 100 generates gas inside during charging due to an electrochemical reaction, causing the internal pressure of the electrode assembly 10 to increase, the surface of the electrode assembly 10 will swell and form unevenness or wrinkles, which will damage the battery performance and pose a safety hazard.

[0120] Through the design of the plurality of protrusions 50 of the insulating protective sheet 20, when the electrode assembly 10 starts to swell, the protrusions 50 can resist the main surface of the electrode assembly 10 to limit its excessive swelling, thereby solving the problem of battery charging swelling and wrinkling.

[0121] Please refer to Figure 12 In some embodiments, the height D3 of the protrusion 50 in the third direction Z is greater than 0 millimeters and less than or equal to 3 centimeters, and the first direction X, the second direction Y and the third direction Z are not coplanar and intersect with each other.

[0122] The height D3 of the protrusions 50 may, for example, be 1 cm, 1.5 cm, 2 cm, 2.5 cm, or 3 cm. If the height D3 of the protrusions 50 is too high in the third direction Z, it can cause the electrolyte to be unable to fully soak in certain areas, forming a soaking dead angle. If the height is too low, it can not effectively guide the flow of electrolyte, causing uneven soaking. Therefore, it is crucial to reasonably set the height D3 of the protrusions 50 to ensure uniformity of soaking.

[0123] Referring to Figure 12 In some embodiments, the height D3 of at least some of the protrusions 50 is different from the height D3 of other protrusions 50.

[0124] In this way, by adjusting the height D3 of the protrusions 50 in different areas, the electrolyte can be guided to soak the electrode assembly 10 according to a predetermined path and speed. This differentiated design helps to achieve more uniform and efficient soaking.

[0125] For example, setting higher protrusions 50 on the side of the insulating protective sheet 20 close to the top of the electrode assembly 10 can accelerate the soaking speed of the electrolyte, while setting lower protrusions 50 on the side close to the bottom of the electrode assembly 10 to balance the soaking speed and uniformity.

[0126] Referring to Figure 12 In some embodiments, along the first direction X, the height D3 of the protrusions 50 in the third direction Z gradually decreases.

[0127] In this way, the gradual decrease of the height D3 of the protrusions 50 along the first direction X can form a natural inclined surface to guide the flow of electrolyte in this direction. This design helps to reduce resistance during soaking, making the electrolyte flow more smoothly to each part of the electrode assembly 10. As the height D3 of the protrusions 50 gradually decreases, the electrolyte will gradually spread to a wider area during soaking. This dispersion effect helps to reduce soaking dead angles and improve soaking uniformity.

[0128] Referring to Figure 12 In some embodiments, the width D4 of at least some of the protrusions 50 in the second direction Y is different from the width D4 of other protrusions 50 in the second direction Y.

[0129] In this way, protrusions 50 of different widths can affect the soaking path and speed of the electrolyte. Wider protrusions 50 can provide more soaking area, while narrower protrusions 50 can guide the electrolyte to pass through certain areas more quickly. By adjusting the width D4 of the protrusions 50, the soaking effect of the electrolyte can be optimized to ensure uniformity and efficiency of soaking.

[0130] Referring to Figure 12In some embodiments, the width D4 of the protrusion 50 in the second direction Y is greater than 0 and less than 2 cm.

[0131] The width D4 of the protrusion 50 can be, for example, 0.5 cm, 0.6 cm, 0.7 cm, 0.8 cm, 0.9 cm, 1.0 cm, 1.1 cm, 1.2 cm, 1.3 cm, or 1.4 cm. The width D4 of the protrusion 50 directly affects the infiltration path and area of the electrolyte. An appropriate width can ensure that the electrolyte can sufficiently infiltrate into the pores of the electrode assembly 10, improving the infiltration efficiency and uniformity. A protrusion 50 that is too wide can increase the difficulty and cost of manufacturing; while a protrusion 50 that is too narrow can be difficult to accurately process and control the size.

[0132] In some embodiments, the spacing width D5 between at least some adjacent protrusions 50 is different from the spacing width D5 between other adjacent protrusions 50.

[0133] Thus, different spacing widths can affect the infiltration path of the electrolyte. By adjusting the spacing width, the electrolyte can be guided to infiltrate along a specific path, thereby improving the infiltration efficiency and uniformity. The differential spacing width design can ensure that the electrolyte can sufficiently infiltrate into all key areas.

[0134] In some embodiments, the spacing width D5 between adjacent protrusions 50 is greater than 0 and less than or equal to 5 cm.

[0135] The spacing width D5 between adjacent protrusions 50 can be, for example, 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm, 3.5 cm, 4 cm, or 4.5 cm. The spacing width directly affects the infiltration path and efficiency of the electrolyte. An appropriate spacing can ensure that the electrolyte can flow smoothly and infiltrate into the electrode assembly 10, thereby improving the performance of the battery.

[0136] Referring to Figure 13 In some embodiments, the protrusion 50 is provided with an indentation 41, which extends at least partially along the first direction X.

[0137] Thus, the indentation 41 can serve as a guide path for electrolyte infiltration, helping the electrolyte to penetrate more uniformly into the battery. This design can improve the infiltration efficiency of the electrolyte, ensuring that the electrode material is sufficiently infiltrated, thereby improving the performance of the battery. The indentation 41 increases the complexity of the surface of the protrusion 50, providing more infiltration points or surface area, so that the electrolyte can more fully contact the electrode material.

[0138] Referring to Figures 14-16 In some embodiments, the projection of the protrusion 50 in the third direction Z is at least one of a rectangle, a polyline, a curve, or a circle, and the first direction X, the second direction Y, and the third direction Z are not coplanar and intersect with each other.

[0139] It should be noted that the two-dimensional shape here refers to the projection shape of the protrusion 50 in the third direction Z. The rectangular protrusion 50 is simple in shape, easy to process and manufacture, and has clear edges, which can provide clear wicking paths and support points, and the rectangular protrusion 50 can form good alignment and cooperation with other structures (such as electrode sheets). The broken line protrusion 50 is complex in shape and has multiple turning points and edges. It can provide multiple wicking paths and support points, which helps to optimize the wicking effect of the electrolyte. The broken line design can also increase the surface area of the protrusion 50 and improve the contact efficiency with the electrolyte. The curved protrusion 50 is smooth in shape and has a smooth curved profile. It can reduce friction and stress concentration, improve the stability and durability of the structure. The curved design can also improve the flowability and wicking effect of the electrolyte. The cylindrical protrusion 50 has a clear diameter and height similar to a cylinder. It can provide stable support and clear wicking paths. The cylindrical design can also increase the surface area of the protrusion 50 and improve the contact efficiency with the electrolyte.

[0140] Please refer to Figure 1 and Figure 5 In some embodiments, the insulating protective sheet 20 includes an insulating body 21, the thickness direction of the insulating body 21 is perpendicular to the first direction X, and the liquid climbing channel 40 is located on the insulating body 21.

[0141] The insulating body 21 is the main part of the insulating protective sheet 20 that wraps all sides of the electrode assembly 10 and is made of Mylar film as the material. Mylar film is a polyester film with high insulation, chemical corrosion resistance and good flexibility. Mylar film not only effectively isolates the electrode assembly 10 from the external environment to prevent short circuit and electrolyte leakage, but also can withstand mechanical stress and thermal stress generated during the charging and discharging process of the battery.

[0142] In addition, the surface of the Mylar film is smooth and easy to process, which facilitates the engraving of the liquid climbing channel 40 on the surface of the Mylar film. Through precise laser etching or mechanical processing technology, fine indentations 41 can be formed on the Mylar film, which can be used to constitute the liquid climbing channel 40.

[0143] Please refer to Figure 1 In some embodiments, the insulating protective sheet 20 further includes a connecting portion 22, at least one end of the insulating body 21 along the first direction X is connected with the connecting portion 22, the connecting portion 22 is parallel to the thickness direction of the insulating body 21, the liquid climbing channel 40 is also located on the connecting portion 22, and the liquid climbing channel 40 of the insulating body 21 and the liquid climbing channel 40 of the connecting portion 22 are communicated.

[0144] The connecting portion 23 is the part of the insulation protection sheet 20 above the top of the electrode assembly 10, which serves to connect the insulation body 21 and is also provided with the liquid creeping channels 40, which are in communication with the liquid creeping channels 40 of the insulation body 21.

[0145] Exemplarily, when the electrolyte starts to infiltrate, the electrolyte first contacts the liquid creeping channels 40 on the insulation body 21. Due to the capillary effect, the electrolyte will quickly creep upward along these channels. At the same time, since the liquid creeping channels 40 on the connecting portion 22 are in communication with the channels on the insulation body 21, the electrolyte can also smoothly enter the connecting portion 22 and continue to creep upward.

[0146] Thus, the communication design enables the electrolyte to cover the entire electrode assembly 10 more quickly, improving the infiltration efficiency.

[0147] In some embodiments, the connecting portion 22 is integrally formed with the insulation body 21.

[0148] Integrally forming is a manufacturing process in which multiple components that would otherwise need to be manufactured separately are directly combined into one whole during the manufacturing process, thereby simplifying the production process, improving production efficiency, and reducing problems caused by poor connection between components. After the insulation body 21 and the connecting portion 22 are combined into the insulation protection sheet 20 by the integrally forming process, a space is left inside the insulation protection sheet 20, which can be used to accommodate the electrode assembly 10, and the electrode assembly 10 and the insulation protection sheet 20 maintain a proper gap therebetween, so that the electrolyte can flow and infiltrate smoothly.

[0149] In a second aspect, the present application also provides a battery device, which comprises the battery monomer 100 of any one of the above.

[0150] The battery device is formed by connecting and packaging a plurality of battery monomers 100 in a specific manner.

[0151] First, the battery monomer 100 that meets the specifications is manufactured according to the design requirements. This includes assembling the components such as the insulation protection sheet 20, the electrode assembly 10, etc. in a specific order and manner, and performing necessary tests and inspections to ensure the performance and quality of the battery monomer 100. Next, a plurality of battery monomers 100 are connected in series or parallel to form a larger battery pack or battery package. During the connection process, it is necessary to ensure that the electrical connection between the battery monomers 100 is reliable and stable, and can meet the overall performance requirements of the battery system. Finally, the connected battery monomers 100 are packaged and protected. This includes adding a shell, heat sink, etc. to the outside of the battery to improve the impact resistance, waterproof and dustproof performance, and heat dissipation performance of the battery.

[0152] Exemplarily, the battery device can be a power battery in an electric vehicle, which is composed of thousands of battery monomers 100. These battery monomers 100 are designed to be flat rectangles or cylinders, etc., and are connected in series or parallel by metal connecting sheets or welding, etc. Between the battery monomers 100 and outside the battery pack, components such as insulating materials, heat-conducting materials, and protective structures are also provided to ensure the safety, reliability, and durability of the battery system. Finally, the entire battery system is installed at the bottom of the electric vehicle or under the seat, etc., to provide power support for the vehicle.

[0153] The battery device composed of the above battery monomers 100 uses the capillary effect principle to make the electrolyte climb up to the top of the electrode assembly 10 through the liquid climbing channel 40 provided on the insulating protective sheet 20 during the initial wetting and cyclic wetting process, avoiding the problem of lithium precipitation in the thinned area or large area of the electrode assembly 10 due to insufficient electrolyte at the top, reducing the safety hazards such as short circuit and liquid leakage of the battery device, and increasing the service life of the battery device. At the same time, the restraint of the protruding part 50 on the insulating protective sheet 20 to the electrode assembly 10 prevents the battery device from swelling and wrinkling during charging, further improving the safety of the battery device.

[0154] In a third aspect, the application also provides a power-using device, which includes the above battery device or any one of the battery monomers.

[0155] The battery device or any one of the battery monomers disclosed in the embodiments of the application can be used as a power source for a power-using device. The power-using device can be, but is not limited to, an electric vehicle or a hybrid electric vehicle, a portable electronic device, an industrial device, an energy storage system, and a medical device. The portable electronic device includes a smart phone, a tablet computer, a notebook computer, etc., the industrial device includes a drone, a robot, a power tool (such as a power drill, a power saw, a power wrench, etc.), and the medical device includes a cardiac pacemaker, a breathing machine, a B-ultrasound machine, etc.

[0156] The power-using device using the above battery device or any one of the battery monomers as a power source will have significant advantages in safety, stability, high efficiency, and prolonging the service life, which helps to improve the user experience.

[0157] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises an electrode assembly, an insulating protective sheet and a shell, the electrode assembly and the insulating protective sheet are contained in the shell, the shell is formed with an opening at one end along a first direction, the insulating protective sheet is used for covering the electrode assembly, the insulating protective sheet and the electrode assembly jointly form a liquid creeping channel, the liquid creeping channel at least partially extends along the first direction, and the liquid creeping channel is located at a surface of the insulating protective sheet close to the electrode assembly.

2. The battery cell of claim 1, wherein, The insulating protective sheet is provided with an indentation, and the indentation and the electrode assembly jointly form the liquid creeping channel.

3. The battery cell of claim 2, wherein, A width of the indentation in a second direction is greater than 0 and less than or equal to 5 cm, the second direction is parallel to the surface of the insulating protective sheet and intersects the first direction.

4. The battery cell of claim 3, wherein, A depth of the indentation in a third direction is greater than 0 and less than or equal to 8 mm, the third direction is parallel to the thickness direction of the insulating protective sheet, and the first direction, the second direction and the third direction are not coplanar and intersect each other.

5. The battery cell of claim 4, wherein, Along the first direction, the depth of the indentation in the third direction gradually decreases.

6. The battery cell of any one of claims 2-5, wherein, The indentation comprises a plurality of indentations, and the plurality of indentations are arranged at intervals along the second direction, the second direction is parallel to the surface of the insulating protective sheet and intersects the first direction.

7. The battery cell of claim 6, wherein, The width of at least part of the indentation in the second direction is different from the width of other indentations in the second direction.

8. The battery cell of claim 6, wherein, The depth of at least part of the indentation in the third direction is different from the depth of other indentations in the third direction, the third direction is parallel to the thickness direction of the insulating protective sheet, and the first direction, the second direction and the third direction are not coplanar and intersect each other.

9. The battery cell of any one of claims 2-8, wherein, The roughness of the indentation is greater than 3.

2.

10. The battery cell of any one of claims 2-9, wherein, A projection of the indentation in the third direction is at least one of a straight line, a tree cluster, a polyline, a curve, a rhombus, a square and a circle, and the third direction is parallel to the thickness direction of the insulating protective sheet.

11. The battery cell of any one of claims 1-10, wherein, The insulating protective sheet comprises a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the second direction, and two adjacent protrusions and the electrode assembly jointly form the liquid creeping channel, the second direction is parallel to the surface of the insulating protective sheet and intersects the first direction.

12. The battery cell of claim 11, wherein, A height of the protrusion in the third direction is greater than 0 mm and less than or equal to 3 cm, and the first direction, the second direction and the third direction are not coplanar and intersect each other.

13. The battery cell of claim 12, wherein, The height of at least part of the protrusion is different from the height of other protrusions.

14. The battery cell of claim 12, wherein, Along the first direction, the height of the protrusion in the third direction gradually decreases.

15. The battery cell of any one of claims 11-14, wherein, The width of at least part of the protrusion in the second direction is different from the width of other protrusions in the second direction.

16. The battery cell of claim 15, wherein, The width of the protrusion in the second direction is greater than 0 and less than 2 cm.

17. The battery cell of claim 11, wherein, The interval width between at least part of the adjacent protrusions is different from the interval width between other adjacent protrusions.

18. The battery cell of claim 17, wherein, The interval width between the adjacent protrusions is greater than 0 and less than or equal to 5 cm.

19. The battery cell of any of claims 11-18, wherein, The protrusion is provided with an indentation, and the indentation at least partially extends along the first direction.

20. The battery cell of any one of claims 11-19, wherein, A projection of the protruding portion in a third direction is at least one of a rectangle, a polyline, a curve, and a circle, and the first direction, the second direction, and the third direction are not coplanar and intersect with each other.

21. The battery cell of any one of claims 1-20, wherein, The insulating protective sheet includes an insulating body, a thickness direction of the insulating body is perpendicular to the first direction, and the liquid creep channel is located on the insulating body.

22. The battery cell of claim 21, wherein, The insulating protective sheet further includes a connecting portion, at least one end of the insulating body along the first direction is connected with the connecting portion, a thickness direction of the connecting portion is parallel to the thickness direction of the insulating body, the liquid creep channel is also located on the connecting portion, and the liquid creep channel of the insulating body and the liquid creep channel of the connecting portion are communicated.

23. The battery cell of claim 22, wherein, The connecting portion is integrally formed with the insulating body.

24. A battery device, characterized by A battery cell as claimed in any of claims 1 to 23.

25. An electrical device, comprising: A battery device as claimed in claim 23 or a battery cell as claimed in any of claims 1 to 23.

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