Cover plate assembly and battery cell, battery pack, electric device, method for assembling battery cell

Abstract

The application discloses a cover plate assembly and a battery monomer, a battery pack, an electric device, and an assembling method of the battery monomer. The cover plate assembly comprises a cover plate body provided with a liquid injection hole; a sealing cover is arranged on the liquid injection hole, a sealing groove is defined between the sealing cover and the cover plate body, one side of the sealing groove facing the liquid injection hole is provided with a blocking protrusion separating the sealing groove and the liquid injection hole, and a glue layer for gluing the sealing cover and the cover plate body is arranged in the sealing groove. According to the battery monomer of the embodiment of the application, the sealing cover is fixed on the cover plate body by gluing, the process of fixing the sealing cover on the cover plate body is simpler, the glue layer and the liquid injection hole are separated by the blocking protrusion, the glue agent is prevented from overflowing into the liquid injection hole, the probability that the electrolyte affects the glue layer is reduced, the adhesion of the glue layer is ensured, the glue layer can firmly connect the sealing cover and the cover plate body together, and then the product yield of the battery monomer is improved and the scrap rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a cover plate assembly, a battery monomer, a battery pack, an electric device and an assembling method of the battery monomer. BACKGROUND

[0002] In the related art, a liquid injection hole is formed in a cover plate body of a battery monomer, and a sealing cover is welded and fixed to the cover plate body to cover the liquid injection hole. When laser welding is used, the laser welding is very sensitive to the matching gap, and the size precision of the sealing cover and the liquid injection hole is required to be high. When resistance welding is used, the connection efficiency is low. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the prior art. To this end, the present application provides a cover plate assembly. The cover plate assembly is fixed to the cover plate body by gluing the sealing cover to the cover plate body, so that the process of fixing the sealing cover to the cover plate body is simpler. The blocking protrusion separates the adhesive layer and the liquid injection hole, so that the adhesive agent cannot overflow into the liquid injection hole. At the same time, the probability of the electrolyte affecting the adhesive layer can be reduced, so as to ensure the adhesion of the adhesive layer, so that the adhesive layer can firmly connect the sealing cover and the cover plate body together, thereby facilitating the improvement of the product yield of the battery monomer and the reduction of the scrap rate.

[0004] The present application also provides an electric device having the battery monomer.

[0005] The present application also provides an assembling method of the battery monomer.

[0006] According to the cover plate assembly of the first aspect of the present application, the cover plate body is provided with a liquid injection hole, and the sealing cover is provided on the liquid injection hole. The sealing cover and the cover plate body define a sealing groove, and the side of the sealing groove facing the liquid injection hole has a blocking protrusion separating the sealing groove and the liquid injection hole. The sealing groove is provided with an adhesive layer for gluing the sealing cover and the cover plate body.

[0007] According to the cover plate assembly of the present application, the sealing cover is fixed to the cover plate body by gluing the sealing cover to the cover plate body, so that the process of fixing the sealing cover to the cover plate body is simpler. The blocking protrusion separates the adhesive layer and the liquid injection hole, so that the adhesive agent cannot overflow into the liquid injection hole. At the same time, the probability of the electrolyte affecting the adhesive layer can be reduced, so as to ensure the adhesion of the adhesive layer, so that the adhesive layer can firmly connect the sealing cover and the cover plate body together, thereby facilitating the improvement of the product yield of the battery monomer and the reduction of the scrap rate.

[0008] In addition, the battery monomer according to the above-mentioned embodiments of the present application can also have the following additional technical features:

[0009] According to some embodiments of the present application, the blocking protrusion is defined by a portion of the cover plate body protruding towards the sealing cover, and the blocking protrusion is arranged around the liquid injection hole.

[0010] According to some embodiments of the present application, the blocking protrusion is arranged on the sealing cover and abuts against the cover plate body to define at least part of the side wall of the sealing groove.

[0011] According to some optional embodiments of the present application, the cover plate body is provided with an annular protrusion arranged around the liquid injection hole, and the annular protrusion is located on a side of the blocking protrusion facing the liquid injection hole.

[0012] According to some specific embodiments of the present application, the sealing cover is provided with a recessed space on a side wall thereof facing the liquid injection hole, the recessed space is recessed in a direction away from the liquid injection hole, and at least part of the annular protrusion extends into the recessed space.

[0013] According to some optional embodiments of the present application, the cover plate body is provided with an insertion groove arranged below the bottom wall of the sealing groove in the thickness direction of the cover plate body, and part of the blocking protrusion is located in the insertion groove.

[0014] According to some embodiments of the present application, the cover plate body is provided with a first recessed groove arranged around the liquid injection hole; the sealing cover comprises a fitting portion and an extending protrusion, the extending protrusion is connected with the fitting portion and extends towards the cover plate body, the extending protrusion abuts against the bottom wall of the first recessed groove, the adhesive layer is arranged between the fitting portion and the bottom wall of the first recessed groove, and the extending protrusion defines the blocking protrusion or the extending protrusion and the blocking protrusion define opposite side walls of the sealing groove.

[0015] According to some optional embodiments of the present application, at least one of the fitting portion and the side wall of the first recessed groove is provided with a stepped portion.

[0016] According to some optional embodiments of the present application, the peripheral wall of the first recessed groove away from the liquid injection hole is formed as an inclined surface extending obliquely.

[0017] According to some embodiments of the present application, the cover plate body is provided with a first recessed groove arranged around the liquid injection hole, and at least part of the sealing cover extends into the first recessed groove to jointly define a sealing groove with the cover plate body, wherein the volume of the first recessed groove is greater than the volume of the sealing groove.

[0018] According to some embodiments of the present application, the adhesive layer is an annular adhesive layer arranged around the central axis of the liquid injection hole; and / or, the blocking protrusion is annular and arranged around the central axis of the liquid injection hole.

[0019] According to some embodiments of the present invention, the cover plate assembly further includes a first seal, at least a portion of which is disposed within the injection hole to block the injection hole, and the sealing cap is disposed on the first seal.

[0020] According to some optional embodiments of the present invention, the first sealing member includes a sealing portion that extends into the injection hole and abuts against the inner wall of the injection hole to seal the injection hole; the first sealing member further includes a stop portion disposed in the sealing portion, the cover plate body is provided with a second recess, the second recess is located on the side of the injection hole facing the sealing cover and communicates with the injection hole, and the stop portion abuts against the bottom wall of the second recess.

[0021] According to a second aspect of the present invention, a battery cell is provided, the battery cell including the cover plate assembly described in the first aspect of the present invention.

[0022] According to the embodiments of the present invention, the electrical equipment uses the cover plate assembly described in the first aspect of the present invention to adhesively fix the sealing cover to the cover plate body, which simplifies the process of fixing the sealing cover to the cover plate body. The blocking protrusion separates the adhesive layer and the injection hole, preventing the adhesive from overflowing into the injection hole. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer, so as to ensure the adhesiveness of the adhesive layer. This allows the adhesive layer to firmly connect the sealing cover and the cover plate body together, thereby facilitating the improvement of the product yield of the battery cell and reducing the scrap rate.

[0023] According to a third aspect of the present invention, a battery pack is provided, the battery pack comprising the battery cells described in the second aspect of the present invention.

[0024] According to the battery pack of the present invention, by using the battery cell described in the second aspect of the present invention, the sealing cap is glued and fixed to the cover plate body, which simplifies the process of fixing the sealing cap to the cover plate body. The blocking protrusion separates the adhesive layer and the injection hole, preventing the adhesive from overflowing into the injection hole. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer, so as to ensure the adhesiveness of the adhesive layer. This allows the adhesive layer to firmly connect the sealing cap and the cover plate body together, thereby improving the product yield of the battery cell and reducing the scrap rate.

[0025] According to a fourth aspect of the present invention, an electrical device is provided, the electrical device comprising a battery cell as described in an embodiment of a second aspect of the present invention; or comprising a battery pack as described in an embodiment of a third aspect of the present invention.

[0026] According to the electrical equipment of the present invention, the sealing cap is glued and fixed to the cover plate body, which simplifies the process of fixing the sealing cap to the cover plate body. The blocking protrusion separates the adhesive layer and the injection hole, preventing the adhesive from overflowing into the injection hole. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer, so as to ensure the adhesiveness of the adhesive layer and enable the adhesive layer to firmly connect the sealing cap and the cover plate body together. This facilitates the improvement of the product yield of battery cells and reduces the scrap rate.

[0027] According to a fifth aspect of the present invention, a method for assembling a battery cell is provided, wherein the battery cell is the battery cell described in the second aspect of the present invention. The assembly method includes: injecting liquid into the battery cell through the injection hole; installing a first sealant to block the injection hole; applying adhesive to the sealing cap and / or the cover plate body; assembling the sealing cap such that the adhesive is located within the sealing groove to define the adhesive layer.

[0028] According to the battery cell assembly method of the present invention, by adhesively fixing the sealing cap to the cover plate body, the process of fixing the sealing cap to the cover plate body is simpler, which facilitates the improvement of assembly efficiency and assembly yield.

[0029] In some embodiments of the invention, the portion of the cover body surrounding the injection hole is cleaned before dispensing adhesive; and / or, the sealing cap is cleaned before dispensing adhesive.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is a partial structural schematic diagram of a battery cell according to an embodiment of the present invention;

[0033] Figure 2 This is a top view of a portion of the battery cell structure according to an embodiment of the present invention;

[0034] Figure 3 This is an exploded view of a portion of the battery cell structure according to some embodiments of the present invention;

[0035] Figure 4 This is a partially enlarged exploded view of the housing and sealing cap according to some embodiments of the present invention;

[0036] Figure 5This is a cross-sectional view of a portion of the battery cell structure according to some embodiments of the present invention, wherein the adhesive layer is located within the sealing groove;

[0037] Figure 6 This is a cross-sectional view of a portion of the battery cell structure according to some embodiments of the present invention;

[0038] Figure 7 This is a cross-sectional view of an exploded view of the housing and sealing cap according to some embodiments of the present invention;

[0039] Figure 8 This is a partially enlarged exploded view of the housing and sealing cap according to other embodiments of the present invention;

[0040] Figure 9 This is a cross-sectional view of a portion of the battery cell structure according to other embodiments of the present invention, wherein the adhesive layer is located within the sealing groove;

[0041] Figure 10 This is a cross-sectional view of a portion of the battery cell structure according to other embodiments of the present invention;

[0042] Figure 11 This is a partial structural schematic diagram of a battery cell according to some embodiments of the present invention;

[0043] Figure 12 This is a top view of a portion of the battery cell structure according to some embodiments of the present invention;

[0044] Figure 13 This is a partially enlarged exploded view of the housing and sealing cap according to some embodiments of the present invention;

[0045] Figure 14 This is a cross-sectional view of a battery cell partial structure according to some embodiments of the present invention, wherein the adhesive layer is located inside the sealing groove;

[0046] Figure 15 This is a partial structural schematic diagram of a battery cell according to some embodiments of the present invention;

[0047] Figure 16 This is a schematic diagram of the structure of a battery cell according to some embodiments of the present invention;

[0048] Figure 17 These are schematic diagrams of the structure of a battery cell according to some embodiments of the present invention;

[0049] Figure 18 This is a flowchart of a method for assembling a battery cell according to some embodiments of the present invention;

[0050] Figure 19 This is a flowchart of a method for assembling a battery cell according to some embodiments of the present invention.

[0051] Reference numerals: Battery cell 1, Cover assembly 1000, Cover body 10, Injection hole 11, Sealing groove 12, Blocking protrusion 13, Annular protrusion 14, Insertion groove 15, First recessed groove 16, Second recessed groove 17

[0052] First sealing element 20, sealing part 21, stop part 22

[0053] Sealing cap 30, recessed space 31, mating part 32, stepped part 321, extended protrusion 33, adhesive layer 41. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0055] The cover plate assembly 1000 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0056] like Figures 1-6 As shown, the cover plate assembly 1000 according to an embodiment of the present invention includes a cover plate body 10 and a sealing cover 30.

[0057] The cover plate body 10 is provided with an injection hole 11. Electrolyte is injected into the cover plate body 10 through the injection hole 11 for the charging and discharging consumption of the battery cell 1.

[0058] The sealing cap 30 is placed on the liquid injection hole 11 to seal the liquid injection hole 11, preventing dust and other substances from entering the battery cell 1 from the liquid injection hole 11. At the same time, it can also prevent the liquid injection hole 11 from leaking out, improving the appearance of the battery cell 1.

[0059] A sealing groove 12 is defined between the sealing cap 30 and the cover plate body 10. The sealing groove 12 has a blocking protrusion 13 on the side facing the injection hole 11. The blocking protrusion 13 separates the sealing groove 12 and the injection hole 11. An adhesive layer 41 for adhesively bonding the sealing cap 30 is provided in the sealing groove 12. The adhesive layer 41 adhesively bonds the sealing cap 30 and the cover plate body 10 together to fix the sealing cap 30 on the cover plate body 10 so that the sealing cap 30 can cover the injection hole 11.

[0060] Specifically, the blocking protrusion 13 can separate the sealing groove 12 and the injection hole 11 to prevent the adhesive from overflowing into the injection hole 11 and to prevent the electrolyte at the injection hole 11 from flowing into the sealing groove 12. This reduces the probability of the electrolyte affecting the adhesive layer 41, ensuring the adhesiveness of the adhesive layer 41. The adhesive layer 41 can firmly connect the sealing cap 30 and the cover plate body 10 together and form a sealed sealing groove 12, thereby using the sealing cap 30 to seal the injection hole 11.

[0061] Compared to the prior art where the sealing cap 30 is welded and fixed to the cover plate body 10, this invention simplifies the process of fixing the sealing cap 30 to the cover plate body 10 by adhesive bonding. Furthermore, the blocking protrusion 13 separates the adhesive layer 41 and the injection hole 11, preventing adhesive from overflowing into the injection hole 11 and reducing the probability of electrolyte affecting the adhesive layer 41. This ensures the adhesiveness of the adhesive layer 41, allowing it to firmly connect the sealing cap 30 and the cover plate body 10 together, forming a sealed sealing groove 12. This, in turn, facilitates improved product yield of the battery cell 1 and reduces the scrap rate.

[0062] Therefore, according to the cover plate assembly 1000 of the present invention, the process of fixing the sealing cover 30 to the cover plate body 10 by adhesively fixing the sealing cover 30 to the cover plate body 10 is simpler. The blocking protrusion 13 separates the adhesive layer 41 and the injection hole 11, preventing the adhesive from overflowing into the injection hole 11. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer 41, so as to ensure the adhesiveness of the adhesive layer 41. The adhesive layer 41 can firmly connect the sealing cover 30 and the cover plate body 10 together, thereby facilitating the improvement of the product yield of the battery cell 1 and reducing the scrap rate.

[0063] The cover plate assembly 1000 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0064] In some specific embodiments of the present invention, such as Figures 1-6 As shown, the cover assembly 1000 includes a cover body 10 and a sealing cover 30.

[0065] In some embodiments of the present invention, such as Figure 4 , Figure 5 As shown, the blocking protrusion 13 protrudes from a portion of the cover plate body 10 toward the sealing cover 30. The blocking protrusion 13 is arranged around the injection hole 11 to fully separate the injection hole 11 and the sealing groove 12, thereby reducing the possibility of electrolyte entering the sealing groove 12. This facilitates reducing the probability of electrolyte affecting the adhesive layer 41, ensuring the adhesiveness of the adhesive layer 41. The adhesive layer 41 can firmly connect the sealing cover 30 and the cover plate body 10 together and form a sealed sealing groove 12, thereby improving the product yield of the battery cell 1 and reducing the scrap rate.

[0066] In some embodiments, such as Figure 6 , Figure 7 As shown, a first recess 16 is defined on the cover plate body 10. The first recess 16 is located outside the injection hole 11. A portion of the sealing cap 30 extends into the first recess 16 to define a sealing groove 12 together with the cover plate body 10. A blocking protrusion 13 is provided on the cover plate body 10 and located between the first recess 16 and the injection hole 11 to separate the sealing groove 12 and the injection hole 11. This can prevent the adhesive from overflowing into the injection hole 11 and reduce the possibility of electrolyte entering the first recess 16, as well as the possibility of electrolyte affecting the adhesive layer 41. This makes it easier to use the adhesive layer 41 to glue the sealing cap 30 and the cover plate body 10 together.

[0067] In some examples, when the sealing cap 30 is fixed to the cover plate body 10, glue is first applied in the first sink 16. The blocking protrusion 13 can also prevent the glue in the sealing groove 12 from overflowing into the injection hole 11, thus avoiding glue overflow.

[0068] The blocking protrusion 13 is provided on the cover plate body 10, which also helps to improve the structural strength of the cover plate body 10 and improve the shear resistance of the cover plate body 10, so as to protect the components inside the battery cell 1 using the cover plate body 10.

[0069] In other embodiments, a first recess 16 is defined on the cover body 10, the first recess 16 is located outside the injection hole 11, and a blocking protrusion 13 is provided on the sealing cover 30, the blocking protrusion 13 extends into the first recess 16 to separate the sealing groove 12 and the injection hole 11.

[0070] In some examples, the cover plate assembly 1000 also includes a first seal 20, at least a portion of which is disposed within the injection hole 11 to seal the injection hole 11. When the sealing cap 30 is fixed to the cover plate body 10, adhesive is first applied to the first settling groove 16. The adhesive can flow from the first settling groove 16 to the injection hole 11 to bond the first seal 20 and the injection hole 11 together, thereby improving the sealing performance of the first seal 20 to the injection hole 11.

[0071] The placement of the blocking protrusion 13 on the sealing cover 30 also facilitates the improvement of the structural strength and shear resistance of the sealing cover 30, thereby protecting the first sealing element 20.

[0072] In some embodiments, such as Figure 6As shown, the sealing cap 30 has a recessed space 31 on the side wall facing the injection hole 11. The recessed space 31 is recessed in a direction away from the injection hole 11. The blocking protrusion 13 extends into the recessed space 31 and cooperates with the side wall of the recessed space 31. The blocking protrusion 13 limits the position of the sealing cap 30, thereby facilitating the fixing of the sealing cap 30 and the cover plate body 10 together.

[0073] In some embodiments, the cover plate body 10 is provided with an annular protrusion 14 surrounding the injection hole 11, and a blocking protrusion 13 is provided on the cover plate body 10. The annular protrusion 14 is located on the side of the blocking protrusion 13 facing the injection hole 11, and the blocking protrusion 13 defines the sidewall of the sealing groove 12.

[0074] In some embodiments of the present invention, such as Figure 9 As shown, the blocking protrusion 13 is provided on the sealing cover 30 and abuts against the cover plate body 10 to define at least a portion of the sidewall of the sealing groove 12, thereby defining the space for the adhesive layer 41, so as to fix the cover plate body 10 and the sealing cover 30 together by using the adhesive layer 41. At the same time, by making the blocking protrusion 13 abut against the cover plate body 10, the thickness of the adhesive layer 41 can also be limited, ensuring the uniformity of the thickness of the adhesive layer 41 and preventing the adhesive from overflowing from the gap between the blocking protrusion 13 and the cover plate body.

[0075] The blocking protrusion 13 abuts against the cover plate body 10 to define a sealing groove 12 with uniform thickness, thereby facilitating the uniform distribution of the adhesive layer 41 between the sealing cover 30 and the cover plate body 10, and improving the firmness of the adhesive layer 41 in connecting the sealing cover 30 and the cover plate body 10.

[0076] In some embodiments, such as Figure 9 , Figure 10 As shown, a first recess 16 is defined on the cover plate body 10. The first recess 16 is located outside the injection hole 11. The blocking protrusion 13 on the sealing cap 30 extends into the first recess 16 to define the sealing groove 12 together with the cover plate body 10, so that the thickness of the sealing groove 12 is uniform, which facilitates the uniform distribution of the adhesive layer 41 between the sealing cap 30 and the cover plate body 10, and improves the firmness of the adhesive layer 41 in connecting the sealing cap 30 and the cover plate body 10.

[0077] In some examples, the cover body 10 is provided with an annular protrusion 14, which is located between the blocking protrusion 13 and the injection hole 11. The annular protrusion 14 on the cover body 10 extends into the recessed space 31 of the sealing cap 30 to define the position of the sealing cap 30 on the cover body 10.

[0078] In some alternative embodiments of the present invention, such as Figures 8-10As shown, the cover plate body 10 is provided with an annular protrusion 14 surrounding the injection hole 11. The annular protrusion 14 is located on the side of the blocking protrusion 13 facing the injection hole 11, so that the annular protrusion 14 and the blocking protrusion 13 can be used together to separate the injection hole 11 and the sealing groove 12, further reducing the possibility that the electrolyte will enter the sealing groove 12.

[0079] In some embodiments, such as Figure 9 As shown, the blocking protrusion 13 is provided on the sealing cover 30, and the cover plate body 10 defines the first recess 16. The blocking protrusion 13 on the sealing cover 30 can extend into the first recess 16 and define the side wall of the sealing groove 12.

[0080] In some alternative embodiments of the present invention, such as Figure 10 As shown, the sealing cap 30 has a recessed space 31 on the side wall facing the injection hole 11. The recessed space 31 is recessed in a direction away from the injection hole 11. At least a portion of the annular protrusion 14 extends into the recessed space 31 to limit the position of the sealing cap 30 on the cover plate body 10, thereby facilitating the fixing of the sealing cap 30 and the cover plate body 10 together.

[0081] In some alternative embodiments of the present invention, such as Figure 8 , Figure 9 As shown, in the thickness direction of the cover plate body 10, the cover plate body 10 is provided with an insertion groove 15 that is lower than the bottom wall of the sealing groove 12. A part of the blocking protrusion 13 is located in the insertion groove 15, so that the sealing cover 30 is initially fixed on the cover plate body 10 by the insertion and engagement of the blocking protrusion 13 and the insertion groove 15.

[0082] Furthermore, the insertion and engagement of the blocking protrusion 13 and the insertion groove 15 facilitates the initial positioning of the sealing cover 30, so as to facilitate the quick and accurate installation of the sealing cover 30 to the designated position of the cover plate body 10.

[0083] In some embodiments of the present invention, such as Figure 6 , Figure 7 As shown, the cover plate body 10 is provided with a first settling groove 16 surrounding the injection hole 11. The sealing cover 30 includes a mating part 32 and an extending protrusion 33. The extending protrusion 33 is connected to the mating part 32 and extends toward the cover plate body 10. The extending protrusion 33 abuts against the bottom wall of the first settling groove 16 so that the mating part 32 and the bottom wall of the first settling groove 16 are spaced apart, thereby defining the sealing groove 12.

[0084] The adhesive layer 41 is disposed between the mating part 32 and the bottom wall of the first sink 16 to bond the mating part 32 and the bottom wall of the first sink 16, bond the extension protrusion 33 and the side wall of the first sink 16, and thus fix the sealing cover 30 and the cover plate body 10 together.

[0085] The first settling tank 16 can be an annular tank or a polygonal tank; no further restrictions are imposed here.

[0086] In some embodiments, such as Figure 6 , Figure 7 As shown, the first recess 16 is recessed in the first direction away from the sealing cap 30, the mating part 32 extends in the second direction, the second direction is perpendicular to the first direction, the extending protrusion 33 extends in the first direction, and one end of the extending protrusion 33 in the first direction abuts against the bottom wall of the first recess 16, so that the mating part 32 and the bottom wall of the first recess 16 define a space with uniform thickness in the first direction, thereby ensuring that the adhesive layer 41 has uniform thickness in the first direction, so that the adhesive layer 41 can firmly fix and bond the cap and the cover plate body 10 together, and form a sealed sealing groove 12.

[0087] In some alternative embodiments of the present invention, such as Figure 10 As shown, the extended protrusion 33 defines the blocking protrusion 13 to separate the sealing groove 12 and the injection hole 11, preventing the adhesive from overflowing into the injection hole 11. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer 41, so as to ensure the adhesiveness of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cap 30 and the cover plate body 10 together and form a sealed sealing groove 12.

[0088] In some examples, such as Figure 9 As shown, the extended protrusion 33 is located on the side of the mating part 32 near the injection hole 11, so as to separate the injection hole 11 and the sealing groove 12, prevent the adhesive from overflowing into the injection hole 11, and at the same time reduce the probability of the electrolyte affecting the adhesive layer 41, so as to ensure the adhesiveness of the adhesive layer 41, and enable the adhesive layer 41 to firmly connect the sealing cap 30 and the cover plate body 10 together.

[0089] In other alternative embodiments of the invention, such as Figure 5 As shown, the extending protrusion 33 and the blocking protrusion 13 define the opposite sidewalls of the sealing groove 12.

[0090] In some embodiments, such as Figure 6 As shown, the extension protrusion 33 is located on the side of the mating part 32 away from the injection hole 11. The extension protrusion 33 and the blocking protrusion 13 are arranged opposite each other in the second direction to define the sidewalls of the sealing groove 12 opposite each other in the second direction.

[0091] It should be explained here that "near" and "far" are relative to the axis of the injection hole 11. The side of the mating part 32 that is far away from the injection hole 11 refers to the side of the mating part that is far away from the axis of the injection hole 11, and the side of the mating part 32 that is close to the injection hole 11 refers to the side of the mating part that is close to the axis of the injection hole 11.

[0092] In some alternative embodiments of the present invention, such as Figure 13 , Figure 14 As shown, at least one of the sidewalls of the mating part 32 and the first sink 16 is provided with a stepped part 321 to increase the connection area between the adhesive layer 41 and the sidewall of the mating part 32 or the first sink 16, thereby improving the adhesion between the adhesive layer 41 and the sidewall of the mating part 32 or the first sink 16, and thus facilitating the secure connection between the cover plate body 10 and the sealing cover 30 and form a sealed sealing groove 12.

[0093] In some embodiments, such as Figures 13-15 As shown, the mating part 32 has a stepped part 321 on the side facing the bottom wall of the first sink 16. The stepped part 321 includes a first stepped surface and a second stepped surface. The adhesive layer 41 is located in the sealing groove 12 and is bonded to the first stepped surface and the second stepped surface to increase the connection area between the sealing cover 30 and the adhesive layer 41, thereby improving the adhesion between the adhesive layer 41 and the mating part 32, and making it easier to firmly fix the cover plate body 10 and the sealing cover 30 together.

[0094] In some specific embodiments of the present invention, the depth of the first sink 16 along the first direction is H, the depth of the extended protrusion 33 along the first direction is H1, the length of the mating part 32 along the first direction is H2, and the thickness of the adhesive layer 41 along the first direction is H3.

[0095] In some examples, such as Figure 5 , Figure 7 As shown, the end of the extension protrusion 33 abuts against the bottom wall of the first sink 16, the mating part 32 and the extension protrusion 33 are fully inserted into the first sink 16, the extension protrusion 33 defines the side wall of the sealing groove 12, one side wall of the mating part 32 defines the top wall of the sealing groove 12 and the other side wall of the mating part 32 is flush with the opening of the first sink 16, at this time H=H1+H2.

[0096] In other examples, the end of the extension protrusion 33 abuts against the bottom wall of the first recess 16, the mating part 32 and the extension protrusion 33 extend completely into the first recess 16, the extension protrusion 33 defines the side wall of the sealing groove 12, one side wall of the mating part 32 defines the top wall of the sealing groove 12 and the other side wall of the mating part 32 is lower than the opening of the first recess 16, in which case H > H1 + H2.

[0097] In some other examples, the end of the extending protrusion 33 abuts against the bottom wall of the first recess 16, the mating part 32 and the extending protrusion 33 extend completely into the first recess 16, the extending protrusion 33 defines the side wall of the sealing groove 12, one side wall of the mating part 32 defines the top wall of the sealing groove 12 and the other side wall of the mating part 32 is higher than the opening of the first recess 16, in which case H < H1 + H2. Or, as... Figure 10As shown, the cover plate body 10 is provided with an insertion groove 15 that is lower than the bottom wall of the sealing groove 12, and a part of the extension protrusion 33 is located in the insertion groove 15, at which time H < H1 + H2.

[0098] In some other examples, at least a portion of the adhesive layer 41 is located between the extended protrusion 33 and the bottom wall of the first sink 16, where H3 > H1.

[0099] In some alternative embodiments of the present invention, such as Figure 10 , Figure 15 As shown, the outer peripheral wall of the first settling tank 16 away from the injection hole 11 is formed as an inclined surface to facilitate the insertion of the mating part 32 into the first settling tank 16, thereby facilitating the quick and easy installation of the sealing cap 30 onto the cover plate body 10.

[0100] In some embodiments, the extended protrusion 33 is located on the side of the mating part 32 near the injection hole 11. The outer peripheral wall of the mating part 32 is parallel to the outer peripheral wall of the first sink 16. The outer peripheral wall of the first sink 16 extends obliquely away from the injection hole 11 and the bottom wall of the first sink 16, so that the opening of the first sink 16 is larger, thereby facilitating the mating part 32 to extend into the first sink 16 and reducing the assembly difficulty.

[0101] In some embodiments of the present invention, the cover plate body 10 is provided with a first recess 16 surrounding the injection hole 11, and at least a portion of the sealing cap 30 extends into the first recess 16 to define the sealing groove 12 together with the cover plate body 10, and then the cover plate body 10 and the sealing cap 30 are bonded and fixed together by the adhesive layer 41.

[0102] The volume of the first sink 16 is larger than the volume of the sealing groove 12, so as to reserve enough space for the part of the sealing cover 30 that extends into the first sink 16.

[0103] In some embodiments, such as Figure 10 , Figure 15 As shown, the volume of the first sink 16 is larger than the volume of the sealing groove 12, so that the mating part 32 and the extension protrusion 33 of the sealing cover 30 can extend into the first sink 16.

[0104] The extended protrusion 33 is located below the mating part 32. The top of the mating part 32 is flush with or below the upper surface of the cover body 10. This improves the overall aesthetics of the cover assembly 1000 and prevents the upper surface of the cover assembly 1000 from snagging on objects or scratching users.

[0105] In some embodiments of the present invention, the adhesive layer 41 is an annular adhesive layer, which is arranged around the central axis of the injection hole 11 so that the adhesive layer 41 can be evenly distributed in the circumferential direction of the injection hole 11, thereby using the adhesive layer 41 to adhesively connect the cover plate body 10 and the sealing cover 30 together, so that the sealing cover 30 can fully seal the injection hole 11.

[0106] It should be explained here that the adhesive layer 41 is an annular adhesive layer, which means that the projection of the adhesive layer 41 in the axial direction of the injection hole 11 is annular.

[0107] In some embodiments of the present invention, the blocking protrusion 13 is annular and is arranged around the central axis of the injection hole 11 so that the blocking protrusion 13 extends circumferentially along the injection hole 13, thereby using the blocking protrusion 13 to fully separate the injection hole 11 and the sealing groove 12, preventing adhesive from overflowing into the injection hole 11 and preventing electrolyte at the injection hole 11 from flowing into the sealing groove 12.

[0108] It needs to be explained here that the blocking protrusion 13 is annular, which means that the projection of the blocking protrusion 13 is annular in the axial direction of the injection hole 11.

[0109] In some embodiments of the present invention, the cover plate assembly 1000 further includes a first sealing member 20, at least a portion of which is disposed within the injection hole 11 to block the injection hole 11. A sealing cap 30 is disposed on the first sealing member 20. In this way, after the electrolyte is injected into the cover plate body 10 from the injection hole 11, the first sealing member 20 is used to block the injection hole 11 to prevent the electrolyte in the battery cell 1 from leaking from the injection hole 11.

[0110] In some embodiments, the cover plate body 10 covers the first seal 20 to prevent the first seal 20 from leaking out, thereby protecting the first seal 20 and preventing the first seal 20 from falling off from the injection hole 11 due to accidental contact.

[0111] In some alternative embodiments of the present invention, such as Figure 15 As shown, the first seal 20 includes a sealing part 21, which extends into the injection hole 11 and abuts against the inner wall of the injection hole 11 to seal the injection hole 11 and prevent the electrolyte in the battery cell 1 from leaking from the injection hole 11.

[0112] In some alternative embodiments of the present invention, such as Figure 15As shown, the first sealing member 20 also includes a stop portion 22 provided on the sealing part 21. The cover plate body 10 is provided with a second recess 17. The second recess 17 is located on the side of the injection hole 11 facing the sealing cover 30 and is connected to the injection hole 11. The stop portion 22 abuts against the bottom wall of the second recess 17 to limit the position of the first sealing member 20 in the injection hole 11, so that the first sealing member 20 can fully seal the injection hole 11.

[0113] In some embodiments, such as Figure 1 As shown, the stop part 22 is located at the end of the sealing part 21 facing the sealing cover 30. The size of the sealing part 21 is smaller than the size of the stop part 22. The sealing part 21 can enter the injection hole 11 through the second sink 17 to abut against the inner wall of the injection hole 11, thereby sealing the injection hole 11. When the first sealing member 20 is installed in place, the stop part 22 abuts against the bottom wall of the second sink 17 to limit the position of the first sealing member 20.

[0114] In some specific embodiments of the present invention, such as Figure 5 , Figure 9 and Figure 11 As shown, the first seal 20 is an integral rubber nail. The first seal 20 is interference-fitted with the injection hole 11. The sealing cover 30 has a recessed space 31 on the side wall facing the first seal 20, and the recessed space 31 forms a protrusion on the side wall of the sealing cover 30 facing away from the first seal 20. A part of the first seal 20 extends into the recessed space 31 to protect the first seal 20 using the sealing cover 30.

[0115] The sealing cap 30 can be a circular cap or a polygonal cap; there are no further restrictions here.

[0116] In other specific embodiments of the present invention, such as Figure 12 , Figure 14 and Figure 17 As shown, the first sealing element 20 has a split structure, including a stop portion 22 and a sealing portion 21. The sealing portion 21 is interference-fitted with the injection hole 11. The sealing cap 30 has a recessed space 31 on its side wall facing the first sealing element 20, and the side wall of the sealing cap 30 facing away from the first sealing element 20 is flat.

[0117] The following describes a battery cell according to an embodiment of the present invention. The battery cell according to an embodiment of the present invention includes a housing and a cover assembly 1000 according to the above embodiment of the present invention. The cover body is disposed at the end of the housing to close the end of the housing, thereby forming a closed space.

[0118] According to an embodiment of the present invention, the sealing cap 30 is glued and fixed to the cover plate body 10 using the cover plate assembly 1000 of the present invention, which simplifies the process of fixing the sealing cap 30 to the cover plate body 10. The blocking protrusion 13 separates the adhesive layer 41 and the injection hole 11, preventing the adhesive from overflowing into the injection hole 11. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer 41, so as to ensure the adhesiveness of the adhesive layer 41. The adhesive layer 41 can firmly connect the sealing cap 30 and the cover plate body 10 together, thereby improving the product yield of the battery cell 1 and reducing the scrap rate.

[0119] The following describes a battery pack according to an embodiment of the present invention. The battery pack according to an embodiment of the present invention includes a plurality of battery cells 1 according to the above embodiments of the present invention.

[0120] According to the battery pack of the present invention, by using the battery cell 1 of the present invention as described above, the sealing cover 30 is glued and fixed to the cover plate body 10, which simplifies the process of fixing the sealing cover 30 to the cover plate body 10. The blocking protrusion 13 separates the adhesive layer 41 and the injection hole 11, preventing the adhesive from overflowing into the injection hole 11. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer 41, so as to ensure the adhesiveness of the adhesive layer 41. The adhesive layer 41 can firmly connect the sealing cover 30 and the cover plate body 10 together, thereby improving the product yield of the battery cell 1 and reducing the scrap rate.

[0121] The following describes an electrical appliance according to an embodiment of the present invention. The electrical appliance according to an embodiment of the present invention includes a battery cell 1 or a battery pack according to the above embodiments of the present invention.

[0122] According to the electrical equipment of the present invention, the sealing cap 30 is glued and fixed to the cover plate body 10, which simplifies the process of fixing the sealing cap 30 to the cover plate body 10. The blocking protrusion 13 separates the adhesive layer 41 and the injection hole 11, preventing the adhesive from overflowing into the injection hole 11. At the same time, it can reduce the probability of the electrolyte affecting the adhesive layer 41, so as to ensure the adhesiveness of the adhesive layer 41. The adhesive layer 41 can firmly connect the sealing cap 30 and the cover plate body 10 together, thereby facilitating the improvement of the product yield of the battery cell 1 and reducing the scrap rate.

[0123] The following describes an assembly method for a battery cell 1 according to an embodiment of the present invention. The battery cell 1 is the battery cell 1 according to the above embodiment of the present invention.

[0124] like Figure 18 , Figure 17 As shown, the assembly method of the first seal 20 includes:

[0125] S1: Inject electrolyte into the battery cells through the injection hole;

[0126] S2: Install the first seal to block the injection hole;

[0127] S4: Apply adhesive to the sealing cap and / or the cap plate body;

[0128] S5: Assemble the sealing cap.

[0129] Specifically, electrolyte is first added into the battery cell 1 through the injection hole 11, then the first sealing member 20 is used to seal the injection hole 11, adhesive is applied to at least one of the sealing cap 30 and the cover plate body 10, and then the sealing cap 30 is assembled onto the cover plate body 10, with the adhesive applied in the sealing groove 12 to define the adhesive layer 41 in the sealing groove 12. The adhesive layer 41 is used to fix the sealing cap 30 and the cover plate body 10 together, so that the sealing cap 30 covers the injection hole 11 and the first sealing member 20, and the sealing cap 30 and the cover plate body 10 form a closed sealing groove 12.

[0130] According to the assembly method of the battery cell 1 of the present invention, the process of fixing the sealing cover 30 to the cover plate body 10 by adhesively fixing the sealing cover 30 to the cover plate body 10 is simpler, which facilitates the improvement of assembly efficiency and assembly yield.

[0131] In some embodiments of the present invention, such as Figure 19 As shown, the assembly method of battery cell 1 further includes, before dispensing adhesive:

[0132] S31: Clean the area surrounding the injection hole on the cover plate body.

[0133] To remove stains from the area around the injection hole 11 of the cover plate body 10, thereby improving the adhesion between the adhesive layer 41 and the area around the injection hole 11 of the cover plate body 10, so that the adhesive layer 41 and the cover plate body 10 are firmly bonded together.

[0134] In some embodiments, cleaning the portion of the cover plate body 10 surrounding the injection hole 11 includes plasma cleaning. Plasma cleaning can remove dirt from the portion of the cover plate body 10 surrounding the injection hole 11 and increase the free energy of the surface of the portion of the cover plate body 10 surrounding the injection hole 11. This allows the adhesive molecules to penetrate to the surface of the portion of the cover plate body 10 surrounding the injection hole 11 during dispensing, or enables the adhesive to react chemically with its surface. This, in turn, improves the adhesion between the adhesive and the portion of the cover plate body 10 surrounding the injection hole 11 and enhances the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0135] Furthermore, by performing plasma cleaning on the portion of the cover plate body 10 surrounding the injection hole 11, the wettability of the surface of the portion of the cover plate body 10 surrounding the injection hole 11 can be improved. This allows the adhesive to spread quickly on the surface of the portion of the cover plate body 10 surrounding the injection hole 11 when the adhesive is applied. This facilitates the formation of a uniform adhesive layer 41, which in turn securely fixes the cover plate body 10 and the sealing cap 30 together, improving the sealing performance of the adhesive layer 41 on the sealing groove 12.

[0136] In some embodiments, cleaning the portion of the cover plate body 10 surrounding the injection hole 11 includes laser cleaning. Laser cleaning can remove stains on the portion of the cover plate body 10 surrounding the injection hole 11, thereby increasing the free energy of the surface of the portion of the cover plate body 10 surrounding the injection hole 11 and increasing the wettability of the surface of the portion of the cover plate body 10 surrounding the injection hole 11, so that the adhesive and the portion of the cover plate body 10 surrounding the injection hole 11 are firmly bonded together.

[0137] On the other hand, it can also increase the surface roughness of the cover plate body 10 surrounding the injection hole 11, so as to improve the mechanical interlocking ability of the adhesive and the surface of the cover plate body 10 surrounding the injection hole 11 when the adhesive is applied to its surface, thereby making the adhesive and the cover plate body 10 firmly bonded together around the injection hole 11, and improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0138] In addition, when electrolyte overflows into the area surrounding the injection hole 11 on the cover plate body 10, laser cleaning can also remove the electrolyte from the area surrounding the injection hole 11 on the cover plate body 10, so as to prevent the electrolyte from being located between the adhesive layer 41 and the cover plate body 10 and affecting the adhesion between the adhesive layer 41 and the cover plate body 10.

[0139] The portion of the cover plate body 10 surrounding the injection hole 11 can be cleaned by plasma first and then by laser, or it can be cleaned by plasma only or by laser only. There are no restrictions on this.

[0140] In some embodiments of the present invention, such as Figure 7 As shown, the assembly method of battery cell 1 further includes, before dispensing adhesive:

[0141] S32: Clean the sealing cap.

[0142] To remove stains from the sealing cap 30, thereby improving the adhesion between the adhesive layer 41 and the sealing cap 30, so that the adhesive layer 41 and the sealing cap 30 are firmly bonded together.

[0143] In some embodiments, cleaning the sealing cap 30 includes plasma cleaning, which can remove dirt from the sealing cap 30 and increase the free energy of the surface of the sealing cap 30 so that when adhesive is applied later, the molecules of the adhesive can penetrate to the surface of the sealing cap 30 at the microscopic level, or enable the adhesive to react chemically with its surface, thereby improving the adhesion between the adhesive and the sealing cap 30 and improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0144] In addition, plasma cleaning of the sealing cover 30 can improve the wettability of the sealing cover 30 surface, so that when the adhesive is applied to the sealing cover 30, the adhesive can spread quickly on its surface, thus enabling the adhesive to spread smoothly on the surface of the sealing cover 30, so as to form a uniform adhesive layer 41. The adhesive layer 41 is then used to firmly fix the sealing cover 30 and the sealing cover 30 together, thereby improving the sealing performance of the adhesive layer 41 on the sealing groove 12.

[0145] In some embodiments, cleaning the sealing cap 30 includes laser cleaning. Laser cleaning can remove stains from the sealing cap 30, thereby increasing the free energy and wettability of the sealing cap 30 surface, so that the adhesive and the sealing cap 30 are firmly bonded together. On the other hand, it can also increase the surface roughness of the sealing cap 30, so that when the adhesive is applied to its surface, the mechanical interlocking ability between the adhesive and the sealing cap 30 surface is improved, thereby making the adhesive and the sealing cap 30 firmly bonded together and improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0146] In addition, when electrolyte spills onto the sealing cap 30, laser cleaning can also remove the electrolyte from the sealing cap 30 to prevent the electrolyte from being located between the adhesive layer 41 and the sealing cap 30, thus affecting the adhesion between the adhesive layer 41 and the sealing cap 30.

[0147] The sealing cover 30 can be subjected to plasma cleaning first, followed by laser cleaning, or it can be subjected to plasma cleaning only, or it can be subjected to laser cleaning only. There are no major restrictions here.

[0148] In some specific embodiments of the present invention, such as ​ As shown, the cover plate body 10 is provided with a first recess 16 surrounding the injection hole 11. The sealing cap 30 includes a mating part 32 and an extending protrusion 33. The extending protrusion 33 is connected to the mating part 32 and extends toward the cover plate body 10. The extending protrusion 33 abuts against the bottom wall of the first recess 16, so that the mating part 32 and the bottom wall of the first recess 16 are spaced apart, thereby defining a sealing groove 12. The extending protrusion 33 includes a first adhesive surface, and the mating part 32 includes a second adhesive surface. The first adhesive surface and the second adhesive surface respectively define different inner walls of the sealing groove 12.

[0149] When cleaning the portion of the cover plate body 10 surrounding the injection hole 11, the bottom and side walls of the first settling tank 16 can also be cleaned. Specifically, when plasma cleaning is performed on the bottom and side walls of the first settling tank 16, oil stains on the bottom and side walls of the first settling tank 16 can be removed, thereby increasing the free energy and wettability of the bottom and side walls of the first settling tank 16. When laser cleaning is performed on the bottom and side walls of the first settling tank 16, the roughness of the bottom and side walls of the first settling tank 16 can be increased, oil stains on the bottom and side walls of the first settling tank 16 can be removed, thereby increasing the free energy and wettability of the bottom and side walls of the first settling tank 16.

[0150] When cleaning the sealing cover 30, the first and second adhesive surfaces can also be cleaned. Specifically, when plasma cleaning is performed on the sealing cover 30, oil stains on the surfaces of the first and second adhesive surfaces can be removed, thereby increasing the free energy and wettability of the surfaces. When laser cleaning is performed on the sealing cover 30, the roughness of the first and second adhesive surfaces can be increased, oil stains on the surfaces of the first and second adhesive surfaces can be removed, thereby increasing the free energy and wettability of the surfaces.

[0151] The adhesive can be applied to the bottom and side walls of the first sink 16, and / or applied to the first and second adhesive surfaces. When the sealing cap 30 is placed on the cover plate body 10, the sealing cap 30 and the cover plate body 10 define a sealing groove 12. The adhesive is located in the sealing groove 12 and defines an adhesive layer 41, so as to firmly bond the sealing cap 30 and the cover plate body 10 together and form a closed sealing groove 12.

[0152] In some specific embodiments of the present invention, laser cleaning equipment can be used to perform laser cleaning on the portion of the cover plate body 10 surrounding the injection hole 11, and to perform laser cleaning on the sealing cover 30.

[0153] The laser cleaning power of the laser cleaning equipment ranges from 20 to 200W. The laser cleaning frequency ranges from 50 to 300 kHz. The laser cleaning speed ranges from 10 to 7000 mm / s.

[0154] In some specific embodiments of the present invention, plasma cleaning equipment can be used to perform laser cleaning on the portion of the cover plate body 10 surrounding the injection hole 11, and to perform laser cleaning on the sealing cover 30.

[0155] The cleaning power of plasma cleaning equipment is 100-2000W, the cleaning distance is 5-30mm, and the cleaning speed is 1-300mm / s.

[0156] In some specific embodiments of the present invention, an automatic glue applicator can be used to apply glue to the sealing cap 30 and / or the cap plate body 10.

[0157] Specifically, the amount of adhesive can be calculated based on the volume of the sealing groove 12. An automatic adhesive applicator is used to apply adhesive dots to the sealing cover 30 and / or the cover plate body 10 along a set trajectory, at a set adhesive speed, and with a set adhesive amount. The amount of adhesive applied is determined by the sealing groove 12, which helps to reduce the possibility of adhesive overflow.

[0158] In some embodiments, the cover plate body 10 is provided with a first sink 16 surrounding the injection hole 11, and the sealing cover 30 includes a mating part 32 and an extending protrusion 33. The extending protrusion 33 is connected to the mating part 32 and extends toward the cover plate body 10. The extending protrusion 33 abuts against the bottom wall of the first sink 16 so that the mating part 32 and the bottom wall of the first sink 16 are spaced apart, thereby defining the sealing groove 12.

[0159] The volume of the first settling tank 16 is V, the volume of the extension protrusion 33 and the mating part 32 extending into the first settling tank 16 is V1, and the volume of the adhesive is V2, wherein V2 > V - V1, so as to reserve the volume of the adhesive that may be compressed and the adhesive loss.

[0160] In some specific embodiments of the present invention, the adhesive applied to the sealing cap 30 and / or the cover plate body 10 may be a sealant, structural adhesive or hot melt adhesive, so that the sealing cap 30 and the cover plate body 10 form a sealed sealing groove 12. Of course, other adhesives may also be used, and no further restrictions are imposed here.

[0161] The cover plate body 10 and the sealing cover 30 are bonded together using sealant, structural adhesive and hot melt adhesive. The sealing performance of the sealing groove 12 meets the requirements of 1000 hours of aging test at -40℃ to 85℃, 1000 hours of aging test at constant temperature and humidity of 85℃ and RH of 85%, and 1000 hours of immersion in 5% NaCl seawater.

[0162] In some specific embodiments of the present invention, after assembling the sealing cap 30, a settling period is included to allow the adhesive to cure and form an adhesive layer 41. The settling time can be determined according to the type of adhesive.

[0163] In some embodiments, the shear strength of the adhesive layer 41 can be tested after standing. If the shear strength of the adhesive layer 41 is >1 MPa, the next process can be carried out.

[0164] Other configurations and operations of the battery cell 1 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0165] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0166] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0167] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0168] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0169] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (1000), characterized in that, include: The cover plate body (10) is provided with a liquid injection hole (11). A sealing cap (30) is provided on the injection hole (11). A sealing groove (12) is defined between the sealing cap (30) and the cover plate body (10). The sealing groove (12) has a blocking protrusion (13) on the side facing the injection hole (11) that separates the sealing groove (12) and the injection hole (11). An adhesive layer (41) for bonding the sealing cap (30) and the cover plate body (10) is provided in the sealing groove (12). The blocking protrusion (13) is used to prevent the adhesive from overflowing into the injection hole (11). The adhesive is suitable for curing to form the adhesive layer (41).

2. The cover plate assembly (1000) according to claim 1, characterized in that, The blocking protrusion (13) is defined by a portion of the cover body (10) protruding toward the sealing cap (30), and the blocking protrusion (13) is arranged around the injection hole (11).

3. The cover plate assembly (1000) according to claim 1, characterized in that, The blocking protrusion (13) is provided on the sealing cover (30) and the blocking protrusion (13) abuts against the cover body (10) to define at least a portion of the sidewall of the sealing groove (12).

4. The cover plate assembly (1000) according to claim 3, characterized in that, The cover plate body (10) is provided with an annular protrusion (14) surrounding the injection hole (11), the annular protrusion (14) being located on the side of the blocking protrusion (13) facing the injection hole (11).

5. The cover plate assembly (1000) according to claim 4, characterized in that, The sealing cap (30) has a recessed space (31) on its side wall facing the injection hole (11). The recessed space (31) is recessed in a direction away from the injection hole (11), and at least a portion of the annular protrusion (14) extends into the recessed space (31).

6. The cover plate assembly (1000) according to claim 3, characterized in that, In the thickness direction of the cover plate body (10), the cover plate body (10) is provided with an insertion groove (15) that is lower than the bottom wall of the sealing groove (12), and a portion of the blocking protrusion (13) is located in the insertion groove (15).

7. The cover plate assembly (1000) according to any one of claims 1-6, characterized in that, The cover plate body (10) is provided with a first settling groove (16) surrounding the injection hole (11). The sealing cap (30) includes a mating part (32) and an extension protrusion (33). The extension protrusion (33) is connected to the mating part (32) and extends toward the cover plate body (10). The extension protrusion (33) abuts against the bottom wall of the first sink (16). The adhesive layer (41) is disposed between the mating part (32) and the bottom wall of the first sink (16). The extension protrusion (33) defines the blocking protrusion (13) or the extension protrusion (33) and the blocking protrusion (13) define the opposite sidewalls of the sealing groove (12).

8. The cover plate assembly (1000) according to claim 7, characterized in that, At least one of the mating part (32) and the sidewall of the first settling tank (16) is provided with a stepped part (321).

9. The cover plate assembly (1000) according to claim 7, characterized in that, The outer peripheral wall of the first settling tank (16) away from the injection hole (11) is formed as an inclined slope.

10. The cover plate assembly (1000) according to any one of claims 1-6, characterized in that, The cover plate body (10) is provided with a first recess (16) surrounding the injection hole (11), and at least a portion of the sealing cap (30) extends into the first recess (16) to define a sealing groove (12) together with the cover plate body (10). The volume of the first settling tank (16) is greater than the volume of the sealing tank (12).

11. The cover plate assembly (1000) according to any one of claims 1-6, characterized in that, The adhesive layer (41) is an annular adhesive layer, which is arranged around the central axis of the injection hole (11); Alternatively, the blocking protrusion (13) is annular and is arranged around the central axis of the injection hole (11).

12. The cover plate assembly (1000) according to claim 1, characterized in that, It also includes a first seal (20), at least a portion of which is disposed within the injection hole (11) to block the injection hole (11), and a sealing cap (30) is disposed on the first seal (20).

13. The cover plate assembly (1000) according to claim 12, characterized in that, The first sealing element (20) includes a sealing part (21), which extends into the injection hole (11) and abuts against the inner wall of the injection hole (11) to seal the injection hole (11); the first sealing element (20) also includes a stop part (22) provided in the sealing part (21), the cover plate body (10) is provided with a second sink groove (17), the second sink groove (17) is located on the side of the injection hole (11) facing the sealing cover (30) and is connected to the injection hole (11), and the stop part (22) abuts against the bottom wall of the second sink groove (17).

14. A single battery cell, characterized in that, include: The housing and the cover assembly (1000) according to any one of claims 1-13, wherein the cover body is disposed at an end of the housing.

15. A battery pack, characterized in that, It includes multiple battery cells, wherein the battery cells are the battery cells according to claim 14.

16. An electrical device comprising a single battery cell as claimed in claim 14; or comprising a battery pack as claimed in claim 15.

17. A method for assembling a single battery cell, characterized in that, The battery cell is the battery cell according to claim 14, and the assembly method includes: Liquid is injected into the battery cell through the injection hole; Install the first seal to block the injection hole; Apply adhesive to the sealing cap and / or the cap plate body; Assemble the sealing cap such that the adhesive is applied within the sealing groove to define the adhesive layer.

18. The method for assembling a single battery cell according to claim 17, characterized in that, Before applying the adhesive, clean the area surrounding the injection hole on the cover plate body; Or, clean the sealing cap before applying the adhesive.

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