Battery monomer and electric equipment

Abstract

The utility model discloses a battery monomer and electric equipment. The battery monomer comprises a shell and a battery cell arranged in the shell, a liquid injection hole is formed in the shell; wherein a first hydrophobic layer is arranged on at least partial area of the inner surface of the liquid injection hole. A liquid injection nozzle is aligned and inserted into the liquid injection hole, and electrolyte is injected into the shell through the liquid injection nozzle; when liquid injection is completed, the liquid injection nozzle is pulled out, at the moment, the electrolyte remaining in the liquid injection nozzle can drop to the liquid injection hole, due to the fact that the first hydrophobic layer is arranged on the inner surface of the liquid injection hole, the dropped electrolyte cannot be attached to the inner surface of the liquid injection hole and completely flows into the shell, and the problem that the electrolyte is left on the inner surface of the liquid injection hole is solved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more specifically, to a battery cell, and also relates to an electrical device including the above battery cell. Background Art

[0002] Based on the current production process of lithium batteries, a certain amount of electrolyte needs to be injected into the battery to enable the battery to reach its designed capacity to meet market demand; during the injection process, the injection nozzle needs to extend into the injection hole reserved on the battery cover, and the electrolyte is injected into the battery through this hole communicating with the inside of the battery. However, during the first injection and the second injection, there may be a problem that the electrolyte dripping from the injection nozzle cannot flow into the battery and remains on the inner surface of the injection hole. Utility Model Content

[0003] In view of this, this application provides a battery cell, and also provides an electrical device including the above battery cell, which solves the problem of the residue of the electrolyte on the inner surface of the injection hole.

[0004] To achieve the above object, this application provides the following technical solutions:

[0005] A battery cell includes a housing and an electrode core disposed in the housing; an injection hole is provided on the housing;

[0006] Wherein, at least a partial area of the inner surface of the injection hole is provided with a first hydrophobic layer.

[0007] Optionally, in the above battery cell, the housing includes a first wall provided with the injection hole, and the first wall includes a first surface away from the electrode core;

[0008] The injection hole is a counterbore hole, and the counterbore hole includes a step surface;

[0009] The first hydrophobic layer includes a first area disposed on the step surface, and one side of the first area facing away from the step surface is an inclined surface, and the included angle between the inclined surface and the first surface is 5° - 15°.

[0010] Optionally, in the above battery cell, the step surface is inclined relative to the first surface, and the thickness of each part of the first area is the same, and the first area is parallel to the step surface to form the inclined surface.

[0011] Optionally, in the above battery cell, the step surface is parallel to the first surface, and the thicknesses of different parts of the first area are different. From the edge of the opening of the injection hole to the center of the opening of the injection hole, the thickness of the first area gradually decreases to form the inclined surface.

[0012] Optionally, in the above battery cell,

[0013] The thickness of the first hydrophobic layer is 0.1 mm - 0.5 mm;

[0014] and / or,

[0015] The contact angle of the first hydrophobic layer > 150°.

[0016] Optionally, in the above battery cell, the housing includes a first wall provided with the liquid injection hole, and the first wall includes a first surface facing away from the battery cell core;

[0017] The liquid injection hole includes an opening, and a second hydrophobic layer surrounding the opening is provided on the first surface.

[0018] Optionally, in the above battery cell, in the direction from the center of the opening to the edge of the opening, the width of the second hydrophobic layer is 5 mm - 10 mm.

[0019] Optionally, in the above battery cell,

[0020] The thickness of the second hydrophobic layer is 0.1 mm - 0.5 mm;

[0021] and / or,

[0022] The contact angle of the second hydrophobic layer > 150°.

[0023] Optionally, in the above battery cell, the housing includes a housing body and a top cover covering the housing body; the liquid injection hole is provided in the top cover.

[0024] An electrical device includes the above battery cell.

[0025] In the battery cell and the electrical device provided in the present application, a first hydrophobic layer is provided on the inner surface of the liquid injection hole, and the electrolyte dripping from the liquid injection nozzle cannot adhere to the inner surface of the liquid injection hole and completely flows into the battery, solving the problem that the electrolyte remains on the inner surface of the liquid injection hole. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0027] Figure 1 It is a top view of the battery cover of the present application;

[0028] Figure 2 It is a front view of the battery cover of the present application;

[0029] Figure 3 This is a cross-sectional view of the liquid injection hole of the present application;

[0030] Figure 4 This is a cross-sectional view of the liquid injection hole of another embodiment of the present application;

[0031] Figure 5 This is a contact angle measurement diagram of the sample of the embodiment provided by the present application;

[0032] Figure 6 This is a contact angle measurement diagram of the sample of the comparative example provided by the present application.

[0033] Figures 1-6 In:

[0034] 1. Top cover body; 2. Terminal post;

[0035] 11. First surface; 12. Second surface; 13. Liquid injection hole; 14. First hydrophobic layer; 15. Second hydrophobic layer.

[0036] 131. Opening; 132. Step surface; 133. First section; 134. Second section. Detailed implementation manners

[0037] The present application provides a battery cell, and also provides an electrical device including the above battery cell. A liquid injection hole is opened on the housing, and a first hydrophobic layer is provided on at least a part of the inner surface of the liquid injection hole. The electrolyte dripping from the liquid injection nozzle cannot adhere to the inner surface of the liquid injection hole and completely flows into the battery interior, solving the problem that the electrolyte remains on the inner surface of the liquid injection hole.

[0038] In the embodiment of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use. The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiment of the present application is not limited thereto. As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc., and the present application has no special limitation.

[0039] The battery mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity.

[0040] In some embodiments, the battery may be a battery module. When there are multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

[0041] In some embodiments, the battery may be a battery pack. The battery pack includes a box body and a battery, and the battery or the battery module is accommodated in the box body.

[0042] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage electric cabinet, etc.

[0043] The embodiments of the present utility model further provide an electrical equipment, including multiple batteries as described in any one of the foregoing embodiments. The multiple batteries can directly supply power to the electrical equipment, or can form a power supply device, such as a battery module, through parallel connection, series connection or hybrid connection, and supply power to various electrical equipment in the form of the power supply device. The electrical equipment can be in various forms, for example, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric car, a ship, a spacecraft, an electric toy, an electric tool or various household appliances, etc.

[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0045] As Figures 1-4 shown, a battery cell includes a housing and an electrode core disposed in the housing. A liquid injection hole 13 is formed in the housing, and at least a part of the inner surface of the liquid injection hole 13 is provided with a first hydrophobic layer 14.

[0046] Preferably, the entire area of the inner surface of the liquid injection hole 13 is provided with the first hydrophobic layer 14.

[0047] It should be noted that the first hydrophobic layer 14 is made of a superhydrophobic material, which has an extremely low surface energy and can repel the electrolyte, making it impossible or difficult for the electrolyte to wet or penetrate on its surface, and thus showing extremely strong hydrophobic performance.

[0048] The superhydrophobic material can be selected from at least one of fluorinated polymers, nanocomposites containing hydrophobic organic components and inorganic nanoparticles, biomimetic materials with microtopography to achieve superhydrophobic performance, etc.

[0049] Preferably, the superhydrophobic material is sprayed on the inner surface of the liquid injection hole 13 by spraying to form the first hydrophobic layer 14.

[0050] Align the liquid injection nozzle and insert it into the liquid injection hole 13, and inject electrolyte into the interior of the housing through the liquid injection nozzle; when the liquid injection is completed, pull out the liquid injection nozzle. At this time, the electrolyte remaining in the liquid injection nozzle will drip onto the inner surface of the liquid injection hole 13. Since the first hydrophobic layer 14 is provided on the inner surface of the liquid injection hole 13, the dripping electrolyte droplets cannot adhere to the inner surface of the liquid injection hole 13 and completely flow into the interior of the housing, solving the problem that the electrolyte remains on the inner surface of the liquid injection hole 13.

[0051] Please refer to the appendix Figures 3-4 , in some embodiments of the present application, the housing includes a first wall provided with a liquid injection hole 13. The first wall includes a first surface 11 away from the battery cell and a second surface 12 close to the battery cell; the liquid injection hole 13 penetrates through the first surface 11 and the second surface 12. The liquid injection hole 13 is a counterbore hole, and the counterbore hole includes a step surface 132. The first hydrophobic layer 14 includes a first region provided on the step surface 132. The side of the first region facing away from the step surface 132 is an inclined surface, and the included angle between the inclined surface and the first surface 11 is 5°-15°.

[0052] Please refer to the appendix Figures 3-4 , in the direction from the first surface 11 to the second surface 12, the liquid injection hole 13 includes a first section 133, a step surface 132, and a second section 134 connected in sequence; the first section 133 is in the shape of a funnel with a wider upper part and a narrower lower part; the inclined surface is also in the shape of a funnel with a wider upper part and a narrower lower part; the second section 134 is perpendicular to the first surface 11. At least the step surface 132 is provided with the first hydrophobic layer 14; preferably, the first section 133, the step surface 132, and the second section 134 are all provided with the first hydrophobic layer 14.

[0053] It should be noted that the included angle between the inclined surface and the first surface 11 is the inclination angle of the inclined surface; the inclination angle can be any one of 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°. The larger the inclination angle of the inclined surface, the larger the rolling angle of the electrolyte droplets dripping on the inclined surface, and the easier it is for the electrolyte droplets to roll downward along the inclined surface to automatically flow into the interior of the housing.

[0054] The step surface 132 is formed with an inclined surface, which can guide the electrolyte to flow down quickly into the interior of the housing. Further, the step surface and the first hydrophobic layer 14 cooperate to limit the inclination angle of the inclined surface within a relatively small range of 5°-15°, which can well avoid the adhesion of the electrolyte on the surface of the step surface 132; as above, there is no need to set the inclination angle of the inclined surface too large, avoiding the problem that the local thickening of the liquid injection hole 13 caused by forming too large an inclination angle affects the overall design of the battery cell.

[0055] Please refer to the appendix Figure 3, in some embodiments of the present application, the stepped surface 132 is inclined with respect to the first surface 11, the thickness of each part in the first region is the same, and the first region is parallel to the stepped surface 132 to form an inclined surface.

[0056] When forming the first wall, a stepped surface 132 with an inclination angle of 5° - 15° is punched out at the liquid injection hole 13; at this time, a layer of superhydrophobic material with a uniform thickness is sprayed on the inner surface of the liquid injection hole 13, and the complete first hydrophobic layer 14 can be obtained, and an inclined surface is formed in the first region located on the stepped surface 132.

[0057] As above, the inclined surface is formed by adhering to the shape of the stepped surface 132, which can avoid waste of the superhydrophobic material.

[0058] Please refer to the attached Figure 4 , in some embodiments of the present application, the stepped surface 132 is parallel to the first surface 11, the thicknesses of different parts in the first region are different, and in the direction from the edge of the opening of the liquid injection hole 13 to the center of the opening of the liquid injection hole 13, the thickness of the first region gradually decreases to form an inclined surface.

[0059] It should be noted that the direction from the edge of the opening of the liquid injection hole 13 to the center of the opening of the liquid injection hole 13 is the direction indicated by the arrow in the attached Figure 4 figure.

[0060] When forming the first wall, a stepped surface 132 parallel to the first surface 11 is punched out at the liquid injection hole 13; at this time, following the principle of thicker outside and thinner inside, superhydrophobic materials with different thicknesses are sprayed on the stepped surface 132 to form the inclined surface of the first region; and superhydrophobic materials with uniform thicknesses are sprayed on the first section 133 and the second section 134 respectively to obtain the complete first hydrophobic layer 14.

[0061] As above, by controlling the thickness change trend of the superhydrophobic material on the stepped surface 132, an inclined surface that meets the hydrophobic requirements can be obtained. The formation of the inclined surface no longer depends on the shape of the stepped surface 132. As above, the forming process of the liquid injection hole 13 can be simplified; further, the structural types for forming the inclined surface are enriched, and users can select according to actual needs, with strong flexibility and applicability.

[0062] In some embodiments of the present application, the thickness of the first hydrophobic layer 14 is 0.1 mm - 0.5 mm; for example, the thickness of the first hydrophobic layer 14 can be any one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, and 0.5 mm.

[0063] By limiting the thickness of the first hydrophobic layer 14 within the above range, on the premise of ensuring that the first hydrophobic layer 14 has excellent hydrophobic performance, it can avoid excessive thickness of the first hydrophobic layer 14, resulting in waste of the superhydrophobic material and waste of processing costs.

[0064] Furthermore, the contact angle of the first hydrophobic layer 14 > 150°. Still further, the rolling contact angle of the first hydrophobic layer 14 < 10°.

[0065] It should be noted that the contact angle is an important physical quantity for measuring the hydrophobic performance of a material, which is the angle formed by the edge of a liquid droplet and the solid surface at the three-phase junction of solid, liquid, and gas. The rolling contact angle is an important physical quantity for describing the rolling behavior of a liquid on a solid surface, which is the minimum inclination angle between the surface and the horizontal plane when the liquid droplet starts to roll on the inclined surface of the solid. The contact angle of the first hydrophobic layer 14 is the angle formed by the edge of the electrolyte droplet and the first hydrophobic layer 14 at the three-phase junction of the first hydrophobic layer 14, the electrolyte droplet, and air; the rolling contact angle is the minimum inclination angle between the first hydrophobic layer 14 and the horizontal plane when the electrolyte droplet can roll on the first hydrophobic layer 14.

[0066] As above, the extremely low surface energy of the first hydrophobic layer 14 is ensured. The electrolyte droplet presents a spherical shape on the surface of the first hydrophobic layer 14 and can quickly flow down to enter the interior of the housing under the guidance of an inclined surface with a small inclination angle, thus ensuring the self-cleaning ability of the first hydrophobic layer 14 and the ability not to adhere to the electrolyte.

[0067] In some embodiments of the present application, the liquid injection hole includes an opening 131, and a second hydrophobic layer 15 is provided on the first surface 11 around the opening 131.

[0068] It should be noted that the second hydrophobic layer 15 is made of a superhydrophobic material, which has an extremely low surface energy and can repel the electrolyte. It is very difficult for the electrolyte to wet or penetrate its surface, thus showing extremely strong hydrophobic performance. The second hydrophobic layer 15 and the first hydrophobic layer 14 can use the same superhydrophobic material or different superhydrophobic materials.

[0069] Furthermore, the first surface 11 includes a surrounding portion around the opening, and the second hydrophobic layer 15 is provided on the surrounding portion. The superhydrophobic material is sprayed on the surrounding portion by spraying to form the second hydrophobic layer 15.

[0070] Align the liquid injection nozzle with the liquid injection hole 13 and inject the electrolyte into the interior of the housing through the liquid injection nozzle; when the injection is completed and the liquid injection nozzle is pulled out, under the action of the pulling force, the electrolyte remaining in the liquid injection nozzle is easily shaken off onto the surrounding portion of the first surface 11 around the opening 131. Since the second hydrophobic layer 15 is provided on the surrounding portion, the dripping electrolyte cannot adhere to the surface of the surrounding portion, avoiding the problem of electrolyte remaining on the first surface 11.

[0071] Please refer to the appendix Figures 3-4, in some embodiments of the present application, in the direction from the center of the opening 131 to the edge of the opening 131, the width of the second hydrophobic layer 15 is 5 mm - 10 mm; for example, the width of the second hydrophobic layer 15 can be any one of 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm.

[0072] Limiting the width of the second hydrophobic layer 15 within the above range can avoid waste of hydrophobic materials caused by an overly large area of the second hydrophobic layer 15 on the premise that the electrolyte droplets ejected from the liquid injection nozzle can always fall within the range where the second hydrophobic layer 15 is located.

[0073] , in some embodiments of the present application, the thickness of the second hydrophobic layer 15 is 0.1 mm - 0.5 mm; for example, the thickness of the second hydrophobic layer 15 can be any one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm.

[0074] Limiting the thickness of the second hydrophobic layer 15 within the above range can avoid waste of superhydrophobic materials and processing costs caused by an overly large thickness of the second hydrophobic layer 15 on the premise that the second hydrophobic layer 15 has superhydrophobic properties.

[0075] Further, the contact angle of the second hydrophobic layer 15 > 150°. Still further, the rolling contact angle of the second hydrophobic layer 15 < 10°.

[0076] It should be noted that the contact angle of the second hydrophobic layer 15 is the angle formed between the edge of the electrolyte droplet and the second hydrophobic layer 15 at the three-phase junction of the second hydrophobic layer 15, the electrolyte droplet, and air; the rolling contact angle of the second hydrophobic layer 15 is the minimum inclination angle between the second hydrophobic layer 15 and the horizontal plane when the electrolyte droplet can roll on the second hydrophobic layer 15.

[0077] As above, the low surface energy characteristic of the second hydrophobic layer 15 is ensured, and the electrolyte droplets are spherical on the surface of the second hydrophobic layer 15, which is convenient for wiping and cleaning, thereby ensuring the self-cleaning ability of the second hydrophobic layer 15 and its ability not to adhere to the electrolyte.

[0078] , in some embodiments of the present application, the housing includes a housing body and a top cover covering the housing body; the liquid injection hole is opened on the top cover; at this time, the top cover is the first wall described above.

[0079] Please refer to the appendix Figures 1-2 , it should be noted that the top cover includes a top cover body 1, and the liquid injection hole 13 is opened on the top cover body 1. A pole installation hole is opened on the top cover body 1, and a pole 2 is installed in the pole installation hole.

[0080] It should be noted that, in addition to being the top cover, the first wall of the housing can also be any enclosing wall that encloses the housing body, which will not be elaborated one by one here.

[0081] Based on the above battery cell, an embodiment of the present application further provides a battery, which includes a plurality of battery cells arranged side by side, and the battery cells are the battery cells described above.

[0082] Since this battery includes the battery cells described above, for the beneficial effects brought by the battery cells to the battery, please refer to the above, which will not be elaborated one by one here.

[0083] Based on the above battery cell, an embodiment of the present application also discloses an electrical device, which includes the battery cell described above. Only one battery cell can be provided, or multiple battery cells can be arranged side by side to form a battery for supplying power to the electrical device.

[0084] Since this electrical device has the battery cell described above, for the beneficial effects brought by the battery cell to the electrical device, please refer to the above, which will not be elaborated one by one here.

[0085] Embodiment 1

[0086] A liquid injection hole is provided on the top cover, a first hydrophobic layer is provided on the inner surface of the liquid injection hole, the first surface of the top cover away from the battery core includes a surrounding portion around the opening of the liquid injection hole, and a second hydrophobic layer is provided on the surrounding portion.

[0087] Comparative Example 1

[0088] A liquid injection hole is provided on the top cover, a first hydrophobic layer is not provided on the inner surface of the liquid injection hole, the first surface of the top cover away from the battery core includes a surrounding portion around the opening of the liquid injection hole, and a second hydrophobic layer is not provided on the surrounding portion.

[0089] The liquid injection hole and the surrounding portion in Embodiment 1 are respectively cut and sampled to obtain Embodiment Specimen 1 and Embodiment Specimen 2 with a first hydrophobic layer on the surface of the liquid injection hole, and Embodiment Specimen 3 and Embodiment Specimen 4 with a second hydrophobic layer on the surface of the surrounding portion. The liquid injection hole and the surrounding portion in Comparative Example 1 are respectively cut and sampled to obtain Comparative Example Specimen 1 and Comparative Example Specimen 2 without a first hydrophobic layer on the surface of the liquid injection hole, and Comparative Example Specimen 3 and Comparative Example Specimen 4 without a second hydrophobic layer on the surface of the surrounding portion.

[0090] The specimens of Examples 1-4 and Comparative Examples 1-4 were placed horizontally on the surface respectively, and water droplets were dripped onto the surfaces of Example Specimen 1, Example Specimen 3, Comparative Specimen 1, and Comparative Specimen 3; electrolyte droplets were dripped onto the surfaces of Example Specimen 2, Example Specimen 4, Comparative Specimen 2, and Comparative Specimen 4; when the droplets (water droplets and electrolyte droplets are collectively referred to as droplets) dropped onto the specimen surface and reached a stationary state, the contact angles of each droplet were measured by a contact angle measuring instrument; the test results are shown in Table 1.

[0091] It should be noted that the time for the droplets to drop onto the specimen surface and reach a stationary state is 8 s - 10 s. Attached Figure 5 is the contact angle measurement diagram of the example specimen; Attached Figure 6 is the contact angle measurement diagram of the comparative specimen. The contact angle measurement diagram is taken by a contact angle measuring instrument and is used to analyze the shape of the droplets dropping onto the surface of the specimen, and then calculate the size of the contact angle.

[0092] Table 1

[0093]

[0094] From Table 1 and Attached Figures 5-6 it can be seen that the contact angles of water droplets and electrolyte droplets in the example specimens are all greater than those in the comparative specimens; therefore, the top cover provided with the first hydrophobic layer 14 and the second hydrophobic layer 15 has better hydrophobic performance.

[0095] The components and devices involved in this application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with them. The word "or" and "and" used here refer to the word "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0096] It should also be noted that in the device of this application, each component can be disassembled and / or recombined. These disassembly and / or recombination should be regarded as equivalent solutions of this application.

[0097] The foregoing description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0098] The foregoing description has been presented for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

[0099] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, It includes a housing and an electric core disposed within the housing; a liquid injection hole is formed in the housing, and at least a partial region of the inner surface of the liquid injection hole is provided with a first hydrophobic layer; The housing includes a first wall in which the liquid injection hole is formed, and the first wall includes a first surface remote from the electric core; The liquid injection hole includes an opening, the first surface includes a surrounding portion surrounding the opening, and the surrounding portion is provided with a second hydrophobic layer connected to the first hydrophobic layer.

2. The battery cell according to claim 1, characterized in that, The liquid injection hole is a counterbore, and the counterbore includes a step surface; The first hydrophobic layer includes a first region disposed on the step surface, and a side of the first region facing away from the step surface is an inclined surface, and an included angle between the inclined surface and the first surface is 5°-15°.

3. The battery cell according to claim 2, characterized in that, The step surface is inclined relative to the first surface, and each part of the first region has the same thickness, and the first region is parallel to the step surface to form the inclined surface.

4. The battery cell according to claim 2, characterized in that, The step surface is parallel to the first surface, and the thicknesses of different parts of the first region are different. In a direction from the edge of the opening of the liquid injection hole to the center of the opening of the liquid injection hole, the thickness of the first region gradually decreases to form the inclined surface.

5. The battery cell according to claim 1, wherein The thickness of the first hydrophobic layer is 0.1 mm - 0.5 mm; and / or, The contact angle of the first hydrophobic layer > 150°.

6. The battery cell according to claim 1, characterized in that, In a direction from the center of the opening to the edge of the opening, the width of the second hydrophobic layer is 5 mm - 10 mm.

7. The battery cell according to claim 1, wherein The thickness of the second hydrophobic layer is 0.1 mm - 0.5 mm; and / or, The contact angle of the second hydrophobic layer > 150°.

8. The battery cell according to any one of claims 1-7, characterized in that, The housing includes a housing body and a top cover covering the housing body; the liquid injection hole is formed in the top cover.

9. An electrical device, characterized in that, It includes the battery cell according to any one of claims 1-8.

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