Cover plate assembly, single battery, battery pack, electric equipment and assembly method of single battery

Abstract

The invention discloses a cover plate assembly, a battery monomer, a battery pack, electric equipment and an assembly method of the battery monomer, the cover plate assembly comprises: a cover plate body, the cover plate body is provided with a liquid injection hole; the sealing cover covers the liquid injection hole, a sealing groove is defined between the sealing cover and the cover plate body, the side, facing the liquid injection hole, of the sealing groove is provided with a blocking protrusion used for separating the sealing groove and the liquid injection hole, and an adhesive layer used for adhering the sealing cover and the cover plate body is arranged in the sealing groove. According to the battery monomer disclosed by the embodiment of the invention, the sealing cover is glued and fixed on the cover plate body, so that the process of fixing the sealing cover on the cover plate body is simpler, the adhesive layer and the liquid injection hole are separated by utilizing the blocking bulge, an adhesive is prevented from overflowing into the liquid injection hole, meanwhile, the probability that the adhesive layer is influenced by electrolyte can be reduced, and the service life of the battery monomer is prolonged. The sealing cover and the cover plate body can be firmly connected together through the adhesive layer, so that the product yield of the single battery is improved, and the rejection rate is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to an assembly method of a cover plate assembly and a battery cell, a battery pack, an electrical device, and a battery cell. Background Art

[0002] In the related art, a liquid injection hole is opened on the cover body of the battery cell, and a sealing cover is welded and fixed to the cover body to seal the liquid injection hole. When laser welding is used, since laser welding is very sensitive to the fitting clearance, high dimensional accuracy requirements are placed on the sealing cover and the liquid injection hole. When resistance welding is used, the connection efficiency is low. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cover plate assembly, which makes the process of fixing the sealing cover to the cover plate body simpler by gluing the sealing cover to the cover plate body, and uses a blocking protrusion to separate the adhesive layer and the injection hole to prevent 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, 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 cell and reducing the scrap rate.

[0004] The present invention also provides an electric device having the battery cell.

[0005] The invention also provides a method for assembling a battery cell.

[0006] According to the first aspect of the present invention, the cover assembly comprises: a cover body, the cover body being provided with a liquid injection hole; a sealing cover, the sealing cover being provided on the liquid injection hole, a sealing groove being defined between the sealing cover and the cover body, a blocking protrusion being provided on the side of the sealing groove facing the liquid injection hole for spacing the sealing groove and the liquid injection hole, an adhesive layer being provided in the sealing groove for gluing the sealing cover and the cover body.

[0007] According to the cover plate assembly of the embodiment of the present invention, the sealing cover is glued to the cover plate body to make the process of fixing the sealing cover to the cover plate body simpler, and the blocking protrusion is used to separate the adhesive layer and the injection hole to prevent the adhesive from overflowing into the injection hole. At the same time, the probability of the electrolyte affecting the adhesive layer can be reduced 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 cell and reducing the scrap rate.

[0008] In addition, the battery cell according to the above embodiment of the present invention may also have the following additional technical features:

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

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

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

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

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

[0014] According to some embodiments of the present invention, the cover body is provided with a first groove arranged around the injection hole; the sealing cover includes a mating portion and an extension protrusion, the extension protrusion is connected to the mating portion and extends toward the cover body, the extension protrusion stops at the bottom wall of the first groove, the adhesive layer is provided between the mating portion and the bottom wall of the first groove, the extension protrusion defines the blocking protrusion or the extension protrusion and the blocking protrusion define the opposite side walls of the sealing groove.

[0015] According to some optional embodiments of the present invention, at least one of the matching portion and the side wall of the first sink is provided with a step portion.

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

[0017] According to some embodiments of the present invention, the cover body is provided with a first groove arranged around the injection hole, and at least a portion of the sealing cover extends into the first groove to jointly define a sealing groove with the cover body, wherein the volume of the first groove is larger than the volume of the sealing groove.

[0018] According to some embodiments of the present invention, the adhesive layer is an annular adhesive layer, and the annular adhesive layer is arranged around the central axis of the injection hole; and\or, the blocking protrusion is annular, and the blocking protrusion is arranged around the central axis of the 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 in the injection hole to seal the injection hole, and the sealing cover is disposed on the first seal.

[0020] According to some optional embodiments of the present invention, the first sealing member includes a sealing portion, which extends into the injection hole and cooperates with the inner wall of the injection hole to close the injection hole; the first sealing member also includes a stop portion provided on the sealing portion, and the cover plate body is provided with a second groove, which is located on the side of the injection hole facing the sealing cover and is connected to the injection hole, and the stop portion abuts against the bottom wall of the second groove.

[0021] According to a second aspect of the present invention, a battery cell is provided. The battery cell includes the cap plate assembly according to the embodiment of the first aspect of the present invention.

[0022] According to the electrical equipment of the embodiment of the present invention, the sealing cover is glued and fixed to the cover body by utilizing the cover assembly described in the embodiment of the first aspect of the present invention, so that the process of fixing the sealing cover to the cover body is simpler, and the blocking protrusion is used to separate the adhesive layer and the injection hole to prevent the adhesive from overflowing into the injection hole. At the same time, the probability of the electrolyte affecting the adhesive layer can be reduced to ensure the adhesion of the adhesive layer, so that the adhesive layer can firmly connect the sealing cover and the cover body together, thereby facilitating the improvement of the product yield of the battery cell and reducing the scrap rate.

[0023] According to an embodiment of a third aspect of the present invention, a battery pack is provided. The battery pack includes the battery cell according to the embodiment of the second aspect of the present invention.

[0024] According to the battery pack of the embodiment of the present invention, the sealing cover is glued and fixed to the cover body by utilizing the battery cell described in the embodiment of the second aspect of the present invention, so that the process of fixing the sealing cover to the cover body is simpler, and the blocking protrusion is used to separate the adhesive layer and the injection hole to prevent the adhesive from overflowing into the injection hole. At the same time, the probability of the electrolyte affecting the adhesive layer can be reduced to ensure the adhesion of the adhesive layer, so that the adhesive layer can firmly connect the sealing cover and the cover body together, thereby facilitating 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 includes the battery cell according to the embodiment of the second aspect of the present invention; or includes the battery pack according to the embodiment of the third aspect of the present invention.

[0026] According to the electrical equipment of the embodiment of the present invention, the sealing cover is glued and fixed to the cover body, which makes the process of fixing the sealing cover to the cover body simpler. The blocking protrusion is used to separate the adhesive layer and the injection hole to prevent the adhesive from overflowing into the injection hole. At the same time, the probability of the electrolyte affecting the adhesive layer can be reduced to ensure the adhesion of the adhesive layer, so that the adhesive layer can firmly connect the sealing cover and the cover body together, thereby facilitating the improvement of the product yield of the battery cell and reducing the scrap rate.

[0027] According to a fifth aspect of the present invention, an assembly method for a battery cell is provided. The battery cell is the battery cell described in the second aspect of the present invention. The assembly method comprises: injecting liquid into the battery cell through the injection hole; installing the first seal to seal the injection hole; applying glue to the sealing cover and / or the cover plate body; assembling the sealing cover and making the glue located in the sealing groove to define the adhesive layer.

[0028] According to the battery cell assembly method of the embodiment of the present invention, the sealing cover is fixed to the cover body by gluing, so that the process of fixing the sealing cover to the cover body is simpler, which is convenient for improving assembly efficiency and assembly yield.

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

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

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

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

[0040] Fig. 9 is a cross-sectional view of a partial structure of a battery cell according to some other embodiments of the present invention, wherein the adhesive layer is located in the sealing groove;

[0041] Fig.10 is a cross-sectional view of a partial structure of a battery cell according to some other embodiments of the present invention;

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

[0043] Fig.12 is a top view of a partial structure of a battery cell according to some other embodiments of the present invention;

[0044] Fig.13 is a partially enlarged exploded view of a housing and a sealing cover according to some other embodiments of the present invention;

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

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

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

[0048] Fig.17 is a schematic diagram of the structure of a battery cell according to some other embodiments of the present invention;

[0049] Fig.18 is a flow chart of a method for assembling a battery cell according to some embodiments of the present invention;

[0050] Fig.19 is a flow chart of a method for assembling a battery cell according to some embodiments of the present invention.

[0051] Reference numerals: battery cell 1, cover plate assembly 1000, cover plate body 10, liquid injection hole 11, sealing groove 12, blocking protrusion 13, annular protrusion 14, plug-in groove 15, first sink groove 16, second sink groove 17,

[0052] The first sealing member 20, the sealing portion 21, the stop portion 22,

[0053] Sealing cover 30 , recessed space 31 , matching portion 32 , step portion 321 , extending protrusion 33 , adhesive layer 41 . DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

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

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

[0057] The cover body 10 is provided with a liquid injection hole 11 , and the electrolyte is injected into the cover body 10 through the liquid injection hole 11 for consumption during charging and discharging of the battery cell 1 .

[0058] The sealing cover 30 is disposed on the injection hole 11 to seal the injection hole 11 to prevent dust and other substances from entering the battery cell 1 from the injection hole 11 , and also to prevent the injection hole 11 from leaking out, thereby improving the appearance of the battery cell 1 .

[0059] A sealing groove 12 is defined between the sealing cover 30 and the cover body 10. The side of the sealing groove 12 facing the injection hole 11 has a blocking protrusion 13. The blocking protrusion 13 separates the sealing groove 12 and the injection hole 11. An adhesive layer 41 for gluing the sealing cover 30 is provided in the sealing groove 12. The adhesive layer 41 glues the sealing cover 30 and the cover body 10 together to fix the sealing cover 30 on the cover body 10 so that the sealing cover 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 prevent the electrolyte at the injection hole 11 from flowing into the sealing groove 12, thereby reducing the probability of the electrolyte affecting the adhesive layer 41 to ensure the adhesion of the adhesive layer 41, so that 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, and then use the sealing cover 30 to seal the injection hole 11.

[0061] Among them, compared with the prior art in which the sealing cover 30 is welded and fixed on the cover body 10, the present invention fixes the sealing cover 30 on the cover body 10 by gluing, so that the process of fixing the sealing cover 30 to the cover body 10 is simpler, and the blocking protrusion 13 is used to separate the adhesive layer 41 and the injection hole 11 to prevent the adhesive from overflowing into the injection hole 11, and at the same time, the probability of the electrolyte affecting the adhesive layer 41 can be reduced to ensure the adhesiveness of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cover 30 and the cover body 10 together, and form a sealed sealing groove 12, thereby facilitating the improvement of the product yield of the battery cell 1 and reducing the scrap rate.

[0062] Therefore, according to the cover assembly 1000 of the embodiment of the present invention, the sealing cover 30 is glued to the cover body 10 to make the process of fixing the sealing cover 30 to the cover body 10 simpler, and the blocking protrusion 13 is used to separate the adhesive layer 41 and the injection hole 11 to prevent the adhesive from overflowing into the injection hole 11. At the same time, the probability of the electrolyte affecting the adhesive layer 41 can be reduced to ensure the adhesion of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cover 30 and the cover 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 will be described below with reference to the accompanying drawings.

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

[0065] In some embodiments of the present invention, Figure 4 , Figure 5 As shown, the blocking protrusion 13 is defined by a portion of the cover body 10 protruding toward the sealing cover 30, and the blocking protrusion 13 is arranged around the injection hole 11 to fully separate the injection hole 11 and the sealing groove 12, so as to reduce the possibility of the electrolyte entering the sealing groove 12, thereby facilitating the reduction of 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 cover 30 and the cover body 10 together, and form a sealed sealing groove 12, thereby facilitating the improvement of the product yield of the battery cell 1 and reducing the scrap rate.

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

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

[0068] The blocking protrusion 13 is arranged on the cover body 10 , which is convenient for improving the structural strength of the cover body 10 and the shear resistance of the cover body 10 , so as to utilize the cover body 10 to protect the components in the battery cell 1 .

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

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

[0071] The blocking protrusion 13 is arranged on the sealing cover 30 , which is convenient for improving the structural strength of the sealing cover 30 and the shear resistance of the sealing cover 30 , so that the sealing cover 30 can be used to protect the first sealing member 20 .

[0072] In some embodiments, Figure 6As shown, a recessed space 31 is provided on the side wall of the sealing cover 30 facing the injection hole 11, and the recessed space 31 is recessed in the 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, so that the position of the sealing cover 30 is limited by the blocking protrusion 13, thereby facilitating the sealing cover 30 and the cover plate body 10 to be fixed together.

[0073] In some embodiments, the cover body 10 is provided with an annular protrusion 14 arranged around the injection hole 11, and the blocking protrusion 13 is arranged on the cover 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 side wall of the sealing groove 12.

[0074] In some embodiments of the present invention, Fig. 9 As shown, the blocking protrusion 13 is provided on the sealing cover 30 and the blocking protrusion 13 stops at the cover body 10 to define at least a portion of the side wall of the sealing groove 12, thereby being able to define a space for setting the adhesive layer 41, so that the cover body 10 and the sealing cover 30 can be fixed together by using the adhesive layer 41, and at the same time, by making the blocking protrusion 13 stop at the cover body 10, the thickness of the adhesive layer 41 can also be limited, thereby ensuring the uniformity of the thickness of the adhesive layer 41 and preventing the glue from overflowing from the gap between the blocking protrusion 13 and the cover body.

[0075] The blocking protrusion 13 is stopped at the cover body 10 to define a sealing groove 12 with uniform thickness, thereby facilitating the adhesive layer 41 to be evenly distributed between the sealing cover 30 and the cover body 10 , thereby improving the firmness of the adhesive layer 41 connecting the sealing cover 30 and the cover body 10 .

[0076] In some embodiments, Fig. 9 , Fig.10 As shown, a first recessed groove 16 is defined on the cover body 10, and the first recessed groove 16 is located on the outer side of the injection hole 11. The blocking protrusion 13 on the sealing cover 30 extends into the first recessed groove 16 to define a sealing groove 12 together with the cover body 10, so that the thickness of the sealing groove 12 is uniform, thereby facilitating the adhesive layer 41 to be evenly distributed between the sealing cover 30 and the cover body 10, thereby improving the firmness of the adhesive layer 41 connecting the sealing cover 30 and the cover body 10.

[0077] In some examples, an annular protrusion 14 is provided on the cover body 10, and the annular protrusion 14 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 cover 30 to limit the position of the sealing cover 30 on the cover body 10.

[0078] In some optional embodiments of the present invention, Figure 8-Figure 10As shown, the cover body 10 is provided with an annular protrusion 14 arranged around the injection hole 11, and 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 to separate the injection hole 11 and the sealing groove 12, further reducing the possibility of electrolyte entering the sealing groove 12.

[0079] In some embodiments, Fig. 9 As shown, the blocking protrusion 13 is disposed on the sealing cover 30 , and the cover body 10 defines a first recessed groove 16 . The blocking protrusion 13 on the sealing cover 30 can extend into the first recessed groove 16 and define the side wall of the sealing groove 12 .

[0080] In some optional embodiments of the present invention, Fig.10 As shown, a recessed space 31 is provided on the side wall of the sealing cover 30 facing the injection hole 11, and the recessed space 31 is recessed in the direction away from the injection hole 11. At least a portion of the annular protrusion 14 extends into the recessed space 31, so that the position of the sealing cover 30 on the cover body 10 can be limited by the annular protrusion 14, thereby facilitating fixing the sealing cover 30 and the cover body 10 together.

[0081] In some optional embodiments of the present invention, Figure 8 , Fig. 9 As shown, in the thickness direction of the cover body 10, the cover body 10 is provided with an insertion groove 15 which is arranged below the bottom wall of the sealing groove 12, and a part of the blocking protrusion 13 is located in the insertion groove 15, so as to utilize the insertion fit between the blocking protrusion 13 and the insertion groove 15 to preliminarily fix the sealing cover 30 on the cover body 10.

[0082] In addition, the plug-in fit between the blocking protrusion 13 and the plug-in groove 15 also facilitates the preliminary positioning of the sealing cover 30 , so as to facilitate the rapid and accurate installation of the sealing cover 30 at the designated position of the cover body 10 .

[0083] In some embodiments of the present invention, Figure 6 , Figure 7 As shown, the cover body 10 is provided with a first recessed groove 16 arranged around the injection hole 11, and the sealing cover 30 includes a matching portion 32 and an extension protrusion 33. The extension protrusion 33 is connected to the matching portion 32 and extends toward the cover body 10. The extension protrusion 33 stops at the bottom wall of the first recessed groove 16, so that the matching portion 32 and the bottom wall of the first recessed groove 16 are spaced apart, thereby defining the sealing groove 12.

[0084] The adhesive layer 41 is disposed between the fitting portion 32 and the bottom wall of the first groove 16 to adhere the fitting portion 32 and the bottom wall of the first groove 16, adhere the extending protrusion 33 and the side wall of the first groove 16, and further fix the sealing cover 30 and the cover plate body 10 together.

[0085] The first sink groove 16 may be an annular groove or a polygonal groove, and no further limitation is imposed here.

[0086] In some embodiments, Figure 6 , Figure 7 As shown, the first groove 16 is recessed along the first direction away from the sealing cover 30, the matching portion 32 extends along the second direction, the second direction is perpendicular to the first direction, the extension protrusion 33 extends along the first direction, and one end of the extension protrusion 33 in the first direction stops at the bottom wall of the first groove 16, so that the matching portion 32 and the bottom wall of the first groove 16 define a space with uniform thickness in the first direction, thereby ensuring that the thickness of the adhesive layer 41 in the first direction is uniform, so that the adhesive layer 41 can firmly fix and bond the sealing cover and the cover plate body 10 together, and form a sealed sealing groove 12.

[0087] In some optional embodiments of the present invention, Fig.10 As shown, the extended protrusion 33 defines a blocking protrusion 13, so that the extended protrusion 33 is used to separate the sealing groove 12 and the injection hole 11, so as to 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, so that 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.

[0088] In some examples, such as Fig. 9 As shown, the extended protrusion 33 is located on the side of the matching portion 32 close to the injection hole 11, so as to separate the injection hole 11 and the sealing groove 12 to prevent 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 to ensure the adhesiveness of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cover 30 and the cover body 10 together.

[0089] In some other optional embodiments of the present invention, Figure 5 As shown, the extending protrusion 33 and the blocking protrusion 13 define opposite side walls of the sealing groove 12 .

[0090] In some embodiments, Figure 6 As shown, the extending protrusion 33 is located on the side of the matching portion 32 away from the injection hole 11, and the extending protrusion 33 and the blocking protrusion 13 are arranged opposite to each other along the second direction to define the opposite side walls of the sealing groove 12 in the second direction.

[0091] It needs to be explained here that the said close and far are relative to the axis of the injection hole 11. The side of the fitting part 32 away from the injection hole 11 refers to the side of the fitting part away from the axis of the injection hole 11, and the side of the fitting part 32 close to the injection hole 11 refers to the side of the fitting part close to the axis of the injection hole 11.

[0092] In some optional embodiments of the present invention, Fig.13 , Fig.14 As shown, at least one of the side walls of the mating portion 32 and the first groove 16 is provided with a step portion 321 to increase the connection area between the adhesive layer 41 and the mating portion 32 or the side wall of the first groove 16, thereby improving the degree of adhesion between the adhesive layer 41 and the mating portion 32 or the side wall of the first groove 16, thereby facilitating the cover plate body 10 and the sealing cover 30 to be firmly fixed together and form a sealed sealing groove 12.

[0093] In some embodiments, Figure 13-Figure 15 As shown, a step portion 321 is provided on one side of the matching portion 32 facing the bottom wall of the first recess 16, and the step portion 321 includes a first step surface and a second step surface. The adhesive layer 41 is located in the sealing groove 12 and adheres to the first step surface and the second step surface to increase the connection area between the sealing cover 30 and the adhesive layer 41, thereby improving the degree of adhesion between the adhesive layer 41 and the matching portion 32, thereby facilitating the cover body 10 and the sealing cover 30 to be firmly fixed together.

[0094] In some specific embodiments of the present invention, the depth of the first groove 16 along the first direction is H, the depth of the extending protrusion 33 along the first direction is H1, the length of the matching portion 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 extended protrusion 33 stops at the bottom wall of the first groove 16, the matching portion 32 and the extended protrusion 33 are completely extended into the first groove 16, the extended protrusion 33 defines the side wall of the sealing groove 12, one side wall of the matching portion 32 defines the top wall of the sealing groove 12 and the other side wall of the matching portion 32 is flush with the open mouth of the first groove 16, at this time H=H1+H2.

[0096] In other examples, the end of the extended protrusion 33 stops at the bottom wall of the first groove 16, the matching portion 32 and the extended protrusion 33 are completely extended into the first groove 16, the extended protrusion 33 defines the side wall of the sealing groove 12, one side wall of the matching portion 32 defines the top wall of the sealing groove 12 and the other side wall of the matching portion 32 is lower than the opening of the first groove 16, and at this time H>H1+H2.

[0097] In some other examples, the end of the extended protrusion 33 stops at the bottom wall of the first recessed groove 16, the matching portion 32 and the extended protrusion 33 are completely extended into the first recessed groove 16, the extended protrusion 33 defines the side wall of the sealing groove 12, one side wall of the matching portion 32 defines the top wall of the sealing groove 12 and the other side wall of the matching portion 32 is higher than the opening of the first recessed groove 16, in this case H Fig.10 ​As shown, the cover body 10 is provided with an inserting groove 15 which is arranged below the bottom wall of the sealing groove 12 , and a part of the extending protrusion 33 is located in the inserting groove 15 , and at this time H

[0098] In some other examples, at least a portion of the adhesive layer 41 is located between the extending protrusion 33 and the bottom wall of the first recess 16 , and in this case, H3 > H1 .

[0099] In some optional embodiments of the present invention, Fig.10 , Fig.15 As shown, the outer peripheral wall of the first sink 16 away from the injection hole 11 is formed as an inclined surface extending obliquely, so as to facilitate the fitting portion 32 to extend into the first sink 16, thereby conveniently and quickly installing the sealing cover 30 on the cover body 10.

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

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

[0102] The volume of the first sink groove 16 is larger than the volume of the sealing groove 12 , so as to reserve sufficient space for the portion of the sealing cover 30 extending into the first sink groove 16 .

[0103] In some embodiments, Fig.10 , Fig.15 As shown, the volume of the first sink groove 16 is made larger than the volume of the sealing groove 12 , so that the matching portion 32 and the extending protrusion 33 of the sealing cover 30 can extend into the first sink groove 16 .

[0104] Among them, the extended protrusion 33 is located below the matching part 32, and the top of the matching part 32 is flush with the upper surface of the cover body 10 or located below the upper surface of the cover body 10. On the one hand, it is convenient to improve the overall aesthetics of the cover assembly 1000, and on the other hand, it can prevent the upper surface of the cover assembly 1000 from hooking onto 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 on the circumference of the injection hole 11, and then the cover plate body 10 and the sealing cover 30 are glued together by using the adhesive layer 41, 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 in the axial direction of the injection hole 11 , the projection of the adhesive layer 41 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 of the injection hole 13, and then the blocking protrusion 13 is used to fully separate the injection hole 11 and the sealing groove 12 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.

[0108] It should be explained here that the blocking protrusion 13 is in a ring shape, which means that in the axial direction of the injection hole 11, the projection of the blocking protrusion 13 is in a ring shape.

[0109] In some embodiments of the present invention, the cover assembly 1000 also includes a first seal 20, at least a portion of which is disposed in the injection hole 11 to seal the injection hole 11, and the sealing cover 30 is disposed on the first seal 20, so that after the electrolyte is injected into the cover body 10 from the injection hole 11, the first seal 20 is used to seal 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 body 10 covers the first sealing member 20 to prevent the first sealing member 20 from leaking out, thereby protecting the first sealing member 20 and preventing the first sealing member 20 from falling off from the injection hole 11 due to accidental touch.

[0111] In some optional embodiments of the present invention, Fig.15 As shown, the first sealing member 20 includes a sealing portion 21 , which extends into the injection hole 11 and abuts against the inner wall of the injection hole 11 to close the injection hole 11 to prevent the electrolyte in the battery cell 1 from leaking from the injection hole 11 .

[0112] In some optional embodiments of the present invention, Fig.15As shown, the first sealing member 20 further includes a stop portion 22 disposed on the sealing portion 21, and the cover body 10 is provided with a second recessed groove 17, which is located on the side of the injection hole 11 facing the sealing cover 30 and is communicated with the injection hole 11, and the stop portion 22 abuts against the bottom wall of the second recessed groove 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, Fig.15 As shown, the stop portion 22 is located at one end of the sealing portion 21 facing the sealing cover 30. The size of the sealing portion 21 is smaller than that of the stop portion 22. The sealing portion 21 can enter the injection hole 11 through the second groove 17 to stop against the inner wall of the injection hole 11, thereby blocking the injection hole 11. When the first sealing component 20 is installed in place, the stop portion 22 stops at the bottom wall of the second groove 17 to limit the position of the first sealing component 20.

[0114] In some specific embodiments of the present invention, Figure 1 , Figure 5 and Fig. 9 As shown, the first seal 20 is an integrated rubber nail, the first seal 20 is interference fit 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 convex portion on the side wall of the sealing cover 30 facing away from the first seal 20, and a part of the first seal 20 extends into the recessed space 31, so that the sealing cover 30 is used to protect the first seal 20.

[0115] The sealing cover 30 may be a circular cover or a polygonal cover, and no further restrictions are imposed here.

[0116] In other specific embodiments of the present invention, Fig.11 , Fig.12 and Fig.14 As shown, the first sealing member 20 is a split structure, and the first sealing member 20 includes a stop portion 22 and a sealing portion 21. The sealing portion 21 is interference-fitted with the injection hole 11. The sealing cover 30 has a recessed space 31 on the side wall facing the first sealing member 20, and the side wall of the sealing cover 30 facing away from the first sealing member 20 is a plane.

[0117] The battery cell according to the embodiment of the present invention is described below. The battery cell according to the embodiment of the present invention comprises a housing and a cap assembly 1000 according to the above embodiment of the present invention, and the cap body is disposed at the end of the housing to close the end of the housing to form a closed space.

[0118] According to the battery cell of the embodiment of the present invention, the sealing cover 30 is glued and fixed to the cover body 10 by utilizing the cover assembly 1000 according to the above-mentioned embodiment of the present invention, so that the process of fixing the sealing cover 30 to the cover body 10 is simpler, and the blocking protrusion 13 is utilized to separate the adhesive layer 41 and the injection hole 11 to prevent the adhesive from overflowing into the injection hole 11, and at the same time, the probability of the electrolyte affecting the adhesive layer 41 can be reduced, so as to ensure the adhesiveness of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cover 30 and the cover body 10 together, thereby facilitating the improvement of the product yield of the battery cell 1 and reducing the scrap rate.

[0119] The battery pack according to the embodiment of the present invention is described below. The battery pack according to the embodiment of the present invention comprises a plurality of battery cells 1 according to the above-mentioned embodiment of the present invention.

[0120] According to the battery pack of the embodiment of the present invention, by utilizing the battery cell 1 according to the above-mentioned embodiment of the present invention, the sealing cover 30 is glued and fixed on the cover body 10, so that the process of fixing the sealing cover 30 to the cover body 10 is simpler, and the blocking protrusion 13 is utilized to separate the adhesive layer 41 and the injection hole 11, so as to prevent the adhesive from overflowing into the injection hole 11, and at the same time, the probability of the electrolyte affecting the adhesive layer 41 can be reduced, so as to ensure the adhesiveness of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cover 30 and the cover body 10 together, thereby facilitating the improvement of the product yield of the battery cell 1 and reducing the scrap rate.

[0121] The following describes an electric device according to an embodiment of the present invention. The electric device according to an embodiment of the present invention comprises a battery cell 1 or a battery pack according to the above-mentioned embodiment of the present invention.

[0122] According to the electrical equipment of the embodiment of the present invention, the sealing cover 30 is glued and fixed to the cover body 10, so that the process of fixing the sealing cover 30 to the cover body 10 is simpler, and the blocking protrusion 13 is used to separate the adhesive layer 41 and the injection hole 11 to prevent the adhesive from overflowing into the injection hole 11. At the same time, the probability of the electrolyte affecting the adhesive layer 41 can be reduced to ensure the adhesion of the adhesive layer 41, so that the adhesive layer 41 can firmly connect the sealing cover 30 and the cover 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 of 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-mentioned embodiment of the present invention.

[0124] like Fig.17 , Fig.18 As shown, the first sealing member 20 assembly method includes:

[0125] S1: injecting liquid into the battery cell through the injection hole;

[0126] S2: Installing a first sealing member to seal the injection hole;

[0127] S4: dispensing glue on the sealing cover and / or the cover plate body;

[0128] S5: Assemble the sealing cover.

[0129] Specifically, the electrolyte is first added to the battery cell 1 from the injection hole 11, and then the first sealant 20 is used to seal the injection hole 11, and glue is applied to at least one of the sealing cover 30 and the cover body 10, and then the sealing cover 30 is assembled to the cover body 10, so that the glue is located in the sealing groove 12 to define an adhesive layer 41 in the sealing groove 12, and the sealing cover 30 and the cover body 10 are fixedly connected together by using the adhesive layer 41, so that the sealing cover 30 is used to seal the injection hole 11 and the first sealant 20, and the sealing cover 30 and the cover body 10 form a closed sealing groove 12.

[0130] According to the assembly method of the battery cell 1 of the embodiment of the present invention, by gluing the sealing cover 30 to the cover body 10 , the process of fixing the sealing cover 30 to the cover body 10 is simplified, which is convenient for improving assembly efficiency and assembly yield.

[0131] In some embodiments of the present invention, Fig.17 As shown, the assembly method of the battery cell 1 further includes, before dispensing glue:

[0132] S31: Cleaning the area surrounding the injection hole of the cover body.

[0133] This can remove stains on the cover body 10 surrounding the injection hole 11, thereby improving the adhesion between the adhesive layer 41 and the cover body 10 surrounding the injection hole 11, so that the adhesive layer 41 and the cover body 10 are firmly bonded together.

[0134] In some embodiments, the cleaning of the portion of the cover body 10 surrounding the injection hole 11 includes plasma cleaning, which can remove dirt on the portion of the cover body 10 surrounding the injection hole 11 and increase the free energy of the surface of the portion of the cover body 10 surrounding the injection hole 11, so that when dispensing glue, the microscopic molecules of the glue can penetrate into the surface of the portion of the cover body 10 surrounding the injection hole 11, or the glue can react chemically with its surface, thereby improving the firmness of the glue and the portion of the cover body 10 surrounding the injection hole 11, and improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0135] In addition, by plasma cleaning the portion of the cover body 10 surrounding the injection hole 11, the wettability of the surface of the cover body 10 surrounding the injection hole 11 can be improved, so that when the glue is applied to the portion of the cover body 10 surrounding the injection hole 11, the glue can spread quickly on its surface, thereby allowing the glue to spread smoothly on the surface of the cover body 10 surrounding the injection hole 11, so as to form a uniform adhesive layer 41, and then use the adhesive layer 41 to firmly fix the cover body 10 and the sealing cover 30 together, thereby improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

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

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

[0138] In addition, when the electrolyte overflows to the portion of the cover body 10 surrounding the injection hole 11, laser cleaning can also remove the electrolyte at the portion of the cover body 10 surrounding the injection hole 11 to avoid the electrolyte being located between the adhesive layer 41 and the cover body 10, affecting the viscosity between the adhesive layer 41 and the cover body 10.

[0139] The portion of the cover body 10 surrounding the injection hole 11 may be first plasma cleaned and then laser cleaned, or may be only plasma cleaned or only laser cleaned, without too many restrictions here.

[0140] In some embodiments of the present invention, Fig.19 As shown, the assembly method of the battery cell 1 further includes, before dispensing glue:

[0141] S32: Clean the sealing cover.

[0142] The stains on the sealing cover 30 can be removed, thereby improving the adhesion between the adhesive layer 41 and the sealing cover 30, so that the adhesive layer 41 and the sealing cover 30 are firmly bonded together.

[0143] In some embodiments, the cleaning of the sealing cover 30 includes plasma cleaning, which can remove dirt on the sealing cover 30 and increase the free energy of the surface of the sealing cover 30, so that when the glue is dispensed later, the microscopic molecules of the glue can penetrate into the surface of the sealing cover 30, or the glue can produce a chemical reaction with its surface, thereby improving the firmness of the adhesion between the glue and the sealing cover 30, and improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0144] In addition, by plasma cleaning the sealing cover 30, the wettability of the surface of the sealing cover 30 can be improved, so that when the glue is applied to the sealing cover 30, the glue can spread quickly on its surface, thereby allowing the glue to spread smoothly on the surface of the sealing cover 30 to form a uniform adhesive layer 41, and then the sealing cover 30 and the sealing cover 30 are firmly fixed together using the adhesive layer 41, thereby improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

[0145] In some embodiments, the cleaning of the sealing cover 30 includes laser cleaning. On the one hand, laser cleaning can remove stains on the sealing cover 30, thereby increasing the free energy of the surface of the sealing cover 30 and the wettability of the surface of the sealing cover 30, so that the glue and the sealing cover 30 are firmly glued together. On the other hand, it can also increase the roughness of the surface of the sealing cover 30, so as to improve the mechanical interlocking ability of the glue and the surface of the sealing cover 30 when the glue is applied to the surface, thereby making the glue and the sealing cover 30 firmly glued together, and improving the sealing performance of the adhesive layer 41 to the sealing groove 12.

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

[0147] The sealing cover 30 may be first plasma cleaned and then laser cleaned, or may be only plasma cleaned, or only laser cleaned, without further limitation.

[0148] In some specific embodiments of the present invention, Figure 7 As shown, the cover body 10 is provided with a first sink groove 16 arranged around the injection hole 11, and the sealing cover 30 includes a matching portion 32 and an extension protrusion 33. The extension protrusion 33 is connected to the matching portion 32 and extends toward the cover body 10. The extension protrusion 33 stops at the bottom wall of the first sink groove 16, so that the matching portion 32 and the bottom wall of the first sink groove 16 are spaced apart, thereby defining the sealing groove 12. The extension protrusion 33 includes a first surface to be bonded, and the matching portion 32 includes a second surface to be bonded. The first surface to be bonded and the second surface to be bonded respectively define different inner walls of the sealing groove 12.

[0149] Among them, when cleaning the portion of the cover body 10 surrounding the injection hole 11, the bottom wall and the side wall of the first trough 16 can be cleaned. Specifically, when the bottom wall and the side wall of the first trough 16 are plasma cleaned, the oil stains on the bottom wall and the side wall of the first trough 16 can be removed, thereby increasing the free energy of the bottom wall and the side wall of the first trough 16 and improving the wettability of the bottom wall and the side wall of the first trough 16; when the bottom wall and the side wall of the first trough 16 are laser cleaned, the roughness of the bottom wall and the side wall of the first trough 16 can be increased, and the oil stains on the bottom wall and the side wall of the first trough 16 can be removed, thereby increasing the free energy of the bottom wall and the side wall of the first trough 16 and improving the wettability of the bottom wall and the side wall of the first trough 16.

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

[0151] Among them, glue dots can be applied to the bottom wall and side walls of the first sink 16, and / or, glue dots can be applied to the first bonding surface and the second bonding surface. When the sealing cover 30 is arranged on the cover body 10, the sealing cover 30 and the cover body 10 define a sealing groove 12, and the glue is located in the sealing groove 12 and defines an adhesive layer 41, so as to firmly bond the sealing cover 30 and the cover body 10 together and form a closed sealing groove 12.

[0152] In some specific embodiments of the present invention, laser cleaning equipment may 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 is 20-200W. The laser cleaning frequency of the laser cleaning equipment is 50-300KHz. The laser cleaning rate of the laser cleaning equipment is 10-7000mm / s.

[0154] In some specific embodiments of the present invention, a plasma cleaning device may 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 the plasma cleaning equipment is 100-2000W, the cleaning distance of the plasma cleaning equipment is 5-30mm, and the cleaning speed of the plasma cleaning equipment is 1-300mm / s.

[0156] In some specific embodiments of the present invention, an automatic glue coating machine may be used to dispense glue on the sealing cover 30 and / or the cover plate body 10 .

[0157] Specifically, the amount of glue applied can be calculated based on the volume of the sealing groove 12, and an automatic glue coating machine can be used to apply glue to the sealing cover 30 and / or the cover body 10 along a set trajectory, set glue coating speed, and set glue coating amount. The amount of glue applied is determined by the sealing groove 12 to reduce the possibility of glue overflow.

[0158] In some embodiments, the cover body 10 is provided with a first groove 16 arranged around the injection hole 11, and the sealing cover 30 includes a mating portion 32 and an extension protrusion 33. The extension protrusion 33 is connected to the mating portion 32 and extends toward the cover body 10. The extension protrusion 33 stops at the bottom wall of the first groove 16 so that the mating portion 32 and the bottom wall of the first groove 16 are spaced apart, thereby defining the sealing groove 12.

[0159] The volume of the first sink 16 is V, the volume of the extended protrusion 33 and the matching portion 32 extending into the first sink 16 is V1, and the volume of the glue is V2, wherein V2>V-V1, so as to reserve the volume that may be compressed by the glue and the loss of the glue.

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

[0161] Among them, the cover body 10 and the sealing cover 30 are bonded together by sealant, structural adhesive and hot melt adhesive, and the sealing performance of the sealing groove 12 meets the requirements of a 1000-hour aging test at -40°C-85°C, meets the requirements of a 1000-hour aging test at a constant temperature and humidity of 85°C and RH85%, and meets the requirements of a 1000-hour immersion test in 5% NaCl seawater.

[0162] In some specific embodiments of the present invention, after assembling the sealing cover 30, the process further includes standing still to allow the glue to solidify and form the adhesive layer 41. The standing still time can be determined according to the type of the adhesive.

[0163] In some embodiments, the shear strength of the adhesive layer 41 may be tested after standing still, and the next process may be performed when the shear strength of the adhesive layer 41 is greater than 1 MPa.

[0164] Other structures and operations of the battery cell 1 according to the embodiment 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 the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0166] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0167] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0168] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

1. A cover plate assembly (1000), characterized in that: include: A cover plate body (10), wherein the cover plate body (10) is provided with a liquid injection hole (11); A sealing cover (30), the sealing cover (30) is arranged to cover the injection hole (11), a sealing groove (12) is defined between the sealing cover (30) and the cover plate body (10), a blocking protrusion (13) is provided on the side of the sealing groove (12) facing the injection hole (11) to separate the sealing groove (12) and the injection hole (11), and an adhesive layer (41) is provided in the sealing groove (12) for gluing the sealing cover (30) and the cover plate body (10).

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 plate body (10) protruding toward the sealing cover (30), and the blocking protrusion (13) is arranged around the liquid injection hole (11).

3. The cover plate assembly (1000) according to claim 1, characterized in that: The blocking protrusion (13) is arranged on the sealing cover (30) and the blocking protrusion (13) abuts against the cover plate body (10) to define at least a portion of the side wall 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) arranged around the liquid injection hole (11), and the annular protrusion (14) is located on a side of the blocking protrusion (13) facing the liquid injection hole (11).

5. The cover plate assembly (1000) according to claim 4, characterized in that: A recessed space (31) is provided on the side wall of the sealing cover (30) facing the liquid injection hole (11); the recessed space (31) is recessed in a direction away from the liquid 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 inserting groove (15) arranged below the bottom wall of the sealing groove (12), and a part of the blocking protrusion (13) is located in the inserting groove (15).

7. The cover plate assembly (1000) according to any one of claims 1 to 6, characterized in that: The cover plate body (10) is provided with a first sink (16) arranged around the liquid injection hole (11); The sealing cover (30) comprises a matching portion (32) and an extending protrusion (33), wherein the extending protrusion (33) is connected to the matching portion (32) and extends toward the cover plate body (10), wherein the extending protrusion (33) stops at the bottom wall of the first recessed groove (16), wherein the adhesive layer (41) is disposed between the matching portion (32) and the bottom wall of the first recessed groove (16), and wherein the extending protrusion (33) defines the blocking protrusion (13) or the extending protrusion (33) and the blocking protrusion (13) define opposite side walls of the sealing groove (12).

8. The cover plate assembly (1000) according to claim 7, characterized in that: At least one of the matching portion (32) and the side wall of the first sink (16) is provided with a step portion (321).

9. The cover plate assembly (1000) according to claim 7, characterized in that: The outer peripheral wall of the first sink (16) away from the liquid injection hole (11) is formed as an inclined surface extending obliquely.

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

11. The cover plate assembly (1000) according to any one of claims 1 to 6, characterized in that: The adhesive layer (41) is an annular adhesive layer, and the annular adhesive layer is arranged around the central axis of the injection hole (11); And\or, 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 comprises a first sealing member (20), at least a portion of which is disposed in the liquid injection hole (11) to seal the liquid injection hole (11), and the sealing cover (30) is disposed on the first sealing member (20).

13. The cover plate assembly (1000) according to claim 12, characterized in that: The first sealing member (20) comprises a sealing portion (21), the sealing portion (21) extends into the liquid injection hole (11) and abuts against the inner wall of the liquid injection hole (11) to close the liquid injection hole (11); the first sealing member (20) further comprises a stop portion (22) arranged on the sealing portion (21), the cover plate body (10) is provided with a second recessed groove (17), the second recessed groove (17) is located on a side of the liquid injection hole (11) facing the sealing cover (30) and is connected to the liquid injection hole (11), and the stop portion (22) abuts against the bottom wall of the second recessed groove (17).

14. A battery cell, characterized in that: include: A shell and a cover plate assembly (1000) according to any one of claims 1 to 13, wherein the cover plate body is arranged at the end of the shell.

15. A battery pack, characterized in that: The invention comprises a plurality of battery cells, wherein the battery cells are the battery cells according to claim 14. 16 . An electrical device, comprising the battery cell according to claim 14 ; or comprising the battery pack according to claim 15 .

17. A method for assembling a battery cell, characterized in that: The battery cell is the battery cell according to claim 14, and the assembly method comprises: injecting liquid into the battery cell through the injection hole; Installing a first sealing member to seal the injection hole; Dispensing glue on the sealing cover and / or the cover plate body; The sealing cover is assembled so that the glue dots are located in the sealing groove to define the adhesive layer.

18. The method for assembling a battery cell according to claim 17, characterized in that: Before dispensing glue, cleaning the portion of the cover plate body surrounding the injection hole; And\or, before dispensing, cleaning the sealing cover.

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