Cover plate, battery device and electric equipment

Abstract

The utility model discloses a cover plate, a battery device and electric equipment, the cover plate is used for the battery device, the cover plate comprises a liquid injection part, the liquid injection part is provided with a first end face, a liquid injection hole and a first groove are formed from the first end face along the thickness direction of the cover plate, and the first groove is located at the periphery of the liquid injection hole. The liquid injection part is provided with the liquid injection hole formed in the first end face and the first annular groove located in the periphery of the liquid injection hole, the first annular groove can receive the electrolyte overflowing from the liquid injection hole in the liquid injection process, the electrolyte is prevented from overflowing to the surface of the cover plate, and the product yield can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of battery devices, in particular to a cover plate, a battery device and electrical equipment. Background Art

[0002] The battery generally includes a cell, a battery shell, a cover plate, and an electrolyte poured into the battery shell. The outer shell of a lithium-ion battery is usually a steel shell or an aluminum shell, and the bare cell is encapsulated in the shell through the cover plate. There is a liquid injection hole on the cover plate. After the battery is filled with liquid, the seal is welded to the liquid injection hole on the cell cover to achieve the sealing of the cover plate.

[0003] The structural design of the existing cover plate may cause the electrolyte to overflow onto the surface of the cover plate during the liquid injection process. If not handled in time, electrolyte crystallization will occur, which will directly affect the sealing welding fire and cause a decrease in yield. Utility Model Content

[0004] The utility model aims to provide a cover plate, a battery device and an electric device, which solve the problem that the electrolyte is easy to overflow to the surface of the cover plate when the liquid injection hole of the cover plate is injected.

[0005] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a cover plate for a battery device, wherein the cover plate includes a liquid injection portion having a first end surface, and a liquid injection hole and a first groove are provided from the first end surface and along the thickness direction of the cover plate, wherein the first groove is located at the periphery of the liquid injection hole.

[0007] In one embodiment, the injection part includes a first cylinder, which encloses the injection hole, the first groove includes a first side wall, a portion of the outer circumferential surface of the first cylinder is the first side wall, and the first cylinder includes the first end face, which is connected to the first side wall; the cover plate also includes a fixing part, which is connected to the outer circumference of the injection part, and the fixing part includes a first surface and a second surface opposite to each other, the first surface and the first end face have the same orientation, and the distance between the first end face and the second surface is smaller than the distance between the first surface and the second surface.

[0008] In one embodiment, the first cylinder protrudes from the second surface.

[0009] In one embodiment, the first groove is an annular groove.

[0010] In one embodiment, there are a plurality of the first grooves, and the plurality of the first grooves are concentrically arranged and spaced apart along the radial direction of the first cylinder.

[0011] In one embodiment, the liquid injection portion also includes a second cylinder, the first groove also includes a second side wall opposite to the first side wall, a portion of the inner circumferential surface of the second cylinder is the second side wall, the second cylinder includes a second end face, the second end face is connected to the second side wall, and the distance between the second end face and the second face is greater than the distance between the first end face and the second face.

[0012] In one embodiment, the liquid injection portion further has a second groove, the second groove surrounds the outer circumference of the first groove, the second groove includes a third side wall, a portion of the outer circumferential surface of the second cylinder is the third side wall, and the second end face is connected to the third side wall.

[0013] In one embodiment, the distance from the bottom wall of the second groove to the second surface is greater than the distance from the bottom wall of the first groove to the second surface.

[0014] In one embodiment, the second cylinder is provided with a through hole, and the through hole passes through the second side wall and the third side wall to connect the first groove and the second groove.

[0015] In one embodiment, there are a plurality of through holes, and the plurality of through holes are arranged at equal intervals along the circumference of the second cylinder.

[0016] In one implementation, the first groove has a first width D1, and the second groove has a second width D2, satisfying: D2≤D1.

[0017] In one embodiment, the injection portion further includes a boss, the second groove further includes a fourth side wall opposite to the third side wall, a portion of the boss constitutes at least a portion of the fourth side wall, and the boss protrudes from the first surface; the cover plate further includes a sealing member and a covering member, the sealing member is suitable for blocking the injection hole, and the covering member is connected and fixed to the boss to cover the sealing member, the first groove and the second groove.

[0018] In a second aspect, the utility model further provides a battery device, comprising a housing, a battery cell and a cover plate as described in any one of the various embodiments of the first aspect, wherein the battery cell is accommodated in the housing, and the cover plate is connected to the housing.

[0019] In a third aspect, the utility model further provides an electrical equipment, comprising an electrical device and a battery device as described in the second aspect, wherein the battery device supplies power to the electrical device.

[0020] By providing the injection part with an injection hole opened from the first end surface and a first annular groove located on the outer periphery of the injection hole, the first annular groove can receive the electrolyte overflowing from the injection hole during the injection process, thereby preventing the electrolyte from overflowing to the surface of the cover plate, thereby improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic top view of a cover plate of an embodiment;

[0023] Figure 2 It is a partial cross-sectional view of the cover plate AA of an embodiment.

[0024] Description of reference numerals:

[0025] 100-cover plate;

[0026] 10-liquid injection portion, 11-liquid injection hole, 12-first groove, 121-first side wall, 122-second side wall, 13-first cylinder, 131-first end surface, 14-second cylinder, 141-second end surface, 142-through hole, 15-second groove, 151-third side wall, 152-fourth side wall, 16-boss, 161-connecting portion, 162-flange;

[0027] 20-fixing portion, 21-first surface, 22-second surface;

[0028] H1-first distance, H2-second distance, H3-third distance. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0031] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0032] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] An embodiment of the utility model provides an electric device, including an electric device and a battery device in the embodiment of the utility model, and the battery device supplies power to the electric device.

[0034] Optionally, the electrical device may be an electric vehicle, a hybrid vehicle, a base station, a household electrical load, etc.

[0035] Optionally, the battery device may be a power battery device, an energy storage battery device, etc., without specific limitation.

[0036] The electrical equipment adopts the battery device in the embodiment of the utility model, and the battery device has a long service life and a high yield rate.

[0037] The embodiment of the utility model further provides a battery device, comprising a housing, a battery cell and a cover plate in the embodiment of the utility model, wherein the battery cell is accommodated in the housing, and the cover plate is connected to the housing.

[0038] Optionally, the battery cell can be a square laminated battery cell, a wound battery cell, etc., without limitation.

[0039] Optionally, the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator, which are stacked in sequence. The battery device also includes a positive electrode tab and a negative electrode tab, which can be arranged at one end of the battery cell in the length direction, or at two opposite or adjacent ends of the battery cell, without specific limitation.

[0040] Optionally, the housing includes a bottom plate and a plurality of side plates, the side plates are connected to the bottom plate and enclosed to form a receiving cavity. The receiving cavity is open at one end opposite to the bottom plate, and the battery cell is received in the receiving cavity.

[0041] Optionally, the shell is made of a material with high structural strength, specifically metal materials, high-strength plastics, ceramics, etc., and metal materials such as aluminum, aluminum alloys, magnesium alloys, iron and iron alloys, etc. The shell can be an integrated structure, that is, the bottom plate and the side plates are an integrated structure made by an integrated molding process, and the integrated molding process can be specifically stamping, casting, etc., without limitation. The shell can also be a split structure, and the side plates and the bottom plate can be connected and fixed by welding, bonding, clamping, screwing, etc. The wall thickness of the shell can be roughly uniform everywhere, that is, the thickness of the side plates can be roughly uniform, and the thickness of the bottom plate and the side plates can also be roughly the same.

[0042] Optionally, the battery device further comprises a cover plate, which is connected to the opening of the shell to close the accommodating cavity. The connection between the cover plate and the shell can be welding, bonding, clamping, screwing, etc., without limitation. The shape of the cover plate can be substantially the same as that of the bottom plate.

[0043] In the manufacturing process of lithium-ion battery devices, welding technology is a key link. The structural design and process stability of welding directly affect the reliability of welding effect, and thus determine the safety of power batteries. In addition to the battery cell, shell, and cover plate, the battery device also includes electrolyte poured into it. There is an injection hole on the cover plate, and the electrolyte is poured in from the injection hole of the cover plate.

[0044] Based on the existing cover plate structural design, electrolyte may overflow onto the surface of the cell cover plate during the injection process. If it is not wiped clean in time, electrolyte crystallization will occur, which will directly affect the subsequent welding process of sealing welding and fire, resulting in a decrease in yield. Therefore, it is of great significance to improve the overflow phenomenon by optimizing the structure of the injection hole of the cover plate to improve the life and reliability of the battery device.

[0045] The battery device in the embodiment of the utility model can solve the problem that the electrolyte is easy to overflow to the surface of the cover plate when the liquid injection hole of the cover plate is injected by adopting the cover plate in the embodiment of the utility model.

[0046] The cover plate in the embodiment of the utility model is described in detail below.

[0047] First define the direction, please refer to Figure 2 . Z is the thickness direction of the cover plate 100 .

[0048] Please refer to Figure 1 and Figure 2 The embodiment of the utility model provides a cover plate 100, comprising a liquid injection portion 10. The liquid injection portion 10 has a first end surface 131, and a liquid injection hole 11 and a first groove 12 are provided from the first end surface 131 and along the thickness direction Z of the cover plate 100. The first groove 12 is located at the periphery of the liquid injection hole 11.

[0049] Optionally, the shape of the injection hole 11 can be circular, square, triangular, polygonal, etc., without specific limitation.

[0050] Optionally, the first groove 12 may be an annular groove or a non-annular groove, and is not specifically limited. The opening direction of the first groove 12 is along the thickness direction Z of the cover plate 100 and faces away from the battery cell.

[0051] Optional, such as Figure 2 As shown, the first groove 12 is an annular groove, which may be a circular annular groove, a square annular groove, etc., without any specific limitation.

[0052] By setting the first groove 12 as an annular groove, it is convenient to receive the electrolyte overflowing from the injection hole 11.

[0053] In the current injection process, the three-step static non-gradient setting of the injection action is used, and there are a large number of bubbles in the electrolyte inside the battery cell that has just been injected (normal pressure injection). With rapid vacuuming, the bubbles will quickly move up and rupture, which can easily cause electrolyte overflow. In addition, during the formation process, due to the negative pressure, there is also the possibility of electrolyte overflow, thereby forming electrolyte crystals around the positive and negative pole ends of the cover plate 100 and the explosion-proof valve, which directly affects the sealing welding fire and leads to a decrease in yield.

[0054] The cover plate 100 in the embodiment of the utility model is provided with a liquid injection hole 11 opened from the first end surface 131 and a first groove 12 located on the outer periphery of the liquid injection hole 11 by setting the liquid injection part 10. The first groove 12 can receive the electrolyte overflowing from the liquid injection hole 11 during the liquid injection process, thereby preventing the electrolyte from overflowing to the surface of the cover plate 100, thereby improving the product yield of the battery device.

[0055] Optional, such as Figure 1 and Figure 2 As shown, the liquid injection part 10 includes a first barrel 13, the first barrel 13 encloses the liquid injection hole 11, the first groove 12 includes a first side wall 121, and the outer peripheral surface of the first barrel 13 is the first side wall 121. The first barrel 13 includes a first end surface 131, and the first end surface 131 is connected to the first side wall 121. The cover plate 100 also includes a fixing part 20, which is connected to the outer periphery of the liquid injection part 10, and the fixing part 20 includes a first surface 21 and a second surface 22 opposite to each other, and the first surface 21 and the first end surface 131 are oriented in the same direction.

[0056] Optionally, the second surface 22 is suitable for facing the battery cell.

[0057] Optionally, the first cylinder 13 may be cylindrical, prismatic, etc., without specific limitation.

[0058] Optionally, a connection between the first end surface 131 and the first side wall 121 is chamfered.

[0059] Optionally, the cover plate 100 further includes a plate body (not shown in the figure), and the fixing portion 20 is a portion connecting the plate body and the liquid injection portion 10 .

[0060] Optionally, the shape of the plate is not specifically limited. For example, when the battery device is a square battery, the plate is square; when the battery device is a cylindrical battery, the plate is round.

[0061] Optionally, the liquid injection part 10 and the fixing part 20 may be an integrated structure, that is, the liquid injection part 10 and the fixing part 20 are an integrated structure made by an integrated molding process, and the integrated molding process may be stamping, casting, etc. The liquid injection part 10 and the fixing part 20 may also be a split structure, and the liquid injection part 10 and the fixing part 20 may be connected and fixed by welding, bonding, clamping, screwing, etc., without specific limitation.

[0062] Optionally, the fixing portion 20 is provided with a through hole (not shown) along the thickness direction Z of the cover plate 100 , the liquid injection portion 10 is received in the through hole, and the outer periphery of the liquid injection portion 10 is connected to the inner wall of the through hole.

[0063] Optionally, the distance between the first end surface 131 and the second surface 22 is smaller than the distance between the first surface 21 and the second surface 22 .

[0064] Optional, such as Figure 2 As shown, the distance between the first end surface 131 and the second surface 22 is a first distance H1, and the distance between the first surface 21 and the second surface 22 is a second distance H2, satisfying: H1≤H2.

[0065] The liquid injection portion 10 includes a first barrel 13, a portion of the outer peripheral surface of the first barrel 13 is the first side wall 121 of the first groove 12, the first barrel 13 includes a first end face 131 connected to the first side wall 121, the fixing portion 20 includes a second face 22 facing the battery cell and a first face 21 opposite to the second face 22, and the distance between the first end face 131 and the second face 22 is smaller than the distance between the first face 21 and the second face 22. In the liquid injection process, the electrolyte overflowing from the liquid injection hole 11 will first accumulate in the first groove 12 to prevent the electrolyte from overflowing to the surface of the cover plate 100, thereby improving the product yield of the battery device.

[0066] Optional, such as Figure 2 As shown, the first cylinder 13 protrudes from the second surface 22 .

[0067] By arranging a portion of the first cylinder 13 to protrude from the fixing portion 20 toward the second surface 22 of the battery cell, alignment and installation of the cover plate 100 and the battery cell are facilitated.

[0068] Optionally, in one embodiment, there are multiple first grooves 12 , and the multiple first grooves 12 are concentrically arranged and spaced apart along the radial direction of the first cylinder 13 .

[0069] Optionally, multiple first grooves 12 are opened from the first end face 131 of the first cylinder 13 along the thickness direction Z of the cover plate 100, and the multiple first grooves 12 are concentrically arranged and radially spaced apart along the first cylinder 13. The side walls of two adjacent first grooves 12 are connected by an end face that is in the same plane as the first end face 131. The first side wall 121 refers to a side wall of the radially innermost first groove 12 along the first cylinder 13.

[0070] By providing a plurality of first grooves 12 , which are concentrically arranged and spaced apart along the radial direction of the first cylinder 13 , the amount of overflowed electrolyte can be increased, thereby preventing the electrolyte from overflowing onto the surface of the cover plate 100 .

[0071] Optional, such as Figure 2 As shown, the liquid injection part 10 further includes a second cylinder 14 , the first groove 12 further includes a second side wall 122 opposite to the first side wall 121 , and a portion of the inner circumference of the second cylinder 14 is the second side wall 122 .

[0072] Optionally, the shape of the second barrel 14 can be cylindrical, prism-shaped, etc., corresponding to the first barrel 13, and there is no specific limitation.

[0073] Optionally, the inner circumference of the second cylinder 14 and the outer circumference of the first cylinder 13 are connected through the bottom surface of the first groove 12. The second cylinder 14 and the first cylinder 13 can be an integral structure or a split structure. The specific connection method can be welding, bonding, clamping, screwing, etc., without specific limitation.

[0074] Optionally, the second cylinder 14 includes a second end surface 141 , the second end surface 141 is connected to the second side wall 122 , and the distance between the second end surface 141 and the second surface 22 is greater than the distance between the first end surface 131 and the second surface 22 .

[0075] Optional, such as Figure 2 As shown, the distance between the second end surface 141 and the second surface 22 is a third distance H3, which satisfies: H3 ≥ H1.

[0076] Optionally, the magnitude relationship between the third distance H3 between the second end surface 141 and the second surface 22 and the second distance H2 between the first surface 21 and the second surface 22 is not limited. In one embodiment, Figure 2 As shown, the third distance H3 is greater than the second distance H2.

[0077] Optionally, the second end surface 141 faces away from the battery cell in the thickness direction Z of the cover plate 100 .

[0078] The liquid injection portion 10 also includes a second barrel 14, a portion of the inner circumferential surface of the second barrel 14 is the second side wall 122 of the first groove 12, the second barrel 14 includes a second end face 141, the second end face 141 is connected to the second side wall 122, the distance between the second end face 141 and the second face 22 is greater than the distance between the first end face 131 and the second face 22, so that the setting position of the first groove 12 is close to the battery cell in the thickness direction Z of the cover plate 100, so as to facilitate and timely receive the electrolyte overflowing from the liquid injection hole 11.

[0079] Optional, such as Figure 2 As shown, the liquid injection part 10 also has a second groove 15, which surrounds the outer periphery of the first groove 12. The second groove 15 includes a third side wall 151, and part of the outer peripheral surface of the second cylinder 14 is the third side wall 151. The second end surface 141 is connected to the third side wall 151.

[0080] Optionally, the second groove 15 can be an annular groove, specifically a circular annular groove, a square annular groove, etc., or a non-annular groove, and there is no specific limitation. When the second groove 15 is an annular groove, the shape of the second groove 15 corresponds to the first groove 12.

[0081] Optionally, the opening direction of the second groove 15 is along the thickness direction Z of the cover plate 100 and faces away from the battery cell.

[0082] Optionally, a connection between the second end surface 141 and the second side wall 122 and a connection between the second end surface 141 and the third side wall 151 are both chamfered.

[0083] Optionally, since the distance between the second end face 141 and the second face 22 is greater than the distance between the first end face 131 and the second face 22, the opening of the first groove 12 is flush with the first end face 131, and the opening of the second groove 15 is flush with the second end face 141, so the opening of the second groove 15 is farther away from the battery cell than the opening of the first groove 12. The liquid overflowing from the injection hole 11 will first accumulate in the first groove 12. After the first groove 12 is filled, the electrolyte will overflow to the second groove 15. The second groove 15 can form a secondary protection function, thereby effectively preventing the electrolyte from contaminating the cover plate 100.

[0084] By setting the liquid injection part 10 also including a second groove 15, the second groove 15 surrounds the outer periphery of the first groove 12, the outer peripheral surface of the second cylinder 14 is the third side wall 151 of the second groove 15, and the second end face 141 is connected to the third side wall 151. The first groove 12 and the second groove 15 form primary and secondary protections for the electrolyte, which can effectively prevent the electrolyte from overflowing and improve the product yield.

[0085] Optionally, the distance from the bottom wall of the second groove 15 to the second surface 22 is greater than the distance from the bottom wall of the first groove 12 to the second surface 22 .

[0086] By setting the distance from the bottom wall of the second groove 15 to the second surface 22 to be greater than the distance from the bottom wall of the first groove 12 to the second surface 22, a height difference is created between the first groove 12 and the second groove 15, which facilitates the reflux of overflowed electrolyte.

[0087] Optional, such as Figure 2 As shown, the second cylinder 14 is provided with a through hole 142 , and the through hole 142 passes through the second side wall 122 and the third side wall 151 to connect the first groove 12 and the second groove 15 .

[0088] Optionally, the shape of the through hole 142 can be circular, square, triangular, etc., without specific limitation.

[0089] Optionally, the opening direction of the through hole 142 may be perpendicular to the thickness direction Z of the cover plate 100 , or may have a certain angle with the thickness direction Z of the cover plate 100 , and there is no specific limitation.

[0090] Optionally, the distance between the opening position of the through hole 142 on the third side wall 151 (based on the center of the through hole 142) and the second surface 22 is greater than the distance between the opening position of the through hole 142 on the second side wall 122 (based on the center of the through hole 142) and the second surface 22 to facilitate electrolyte reflux.

[0091] The second cylinder 14 is provided with a through hole 142 , which penetrates the second side wall 122 and the third side wall 151 to connect the first groove 12 and the second groove 15 , so that the electrolyte overflowing into the second groove 15 can flow back through the through hole 142 , thereby improving the overflow prevention effect.

[0092] Optionally, the number of the through hole 142 may be one or more, and there is no specific limitation.

[0093] Optionally, there are multiple through holes 142 , and the multiple through holes 142 are arranged at equal intervals along the circumference of the second cylinder 14 .

[0094] Optionally, the through hole 142 is circular, and a diameter d of the through hole 142 satisfies: 1 mm≤d≤3 mm.

[0095] Optionally, the specific value of the diameter d can be 1 mm, 1.5 mm, 2 mm, etc., without specific limitation.

[0096] Optionally, the number of the through holes 142 may be 6 to 20, such as 8, 12, 14, 16, etc., without limitation.

[0097] Optionally, the plurality of through holes 142 are provided at equal intervals along the circumference of the second cylinder 14 , and the interval A satisfies: 1.5 mm≤A≤5 mm.

[0098] Optionally, the specific value of the spacing A can be 2 mm, 3 mm, 4 mm, etc., without specific limitation.

[0099] Optionally, the size, number and arrangement of the through holes 142 can be determined according to parameters such as the electrolyte cavity, the material used in the electrolyte cavity, the type of electrolyte, and the ambient temperature of use.

[0100] By providing a plurality of through holes 142 , which are equally spaced along the circumference of the second cylinder 14 , the electrolyte overflowing into the second tank 15 flows back to the first tank 12 through the through holes 142 , thereby improving the overflow prevention effect.

[0101] Optionally, the first groove 12 has a first width D1, and the second groove 15 has a second width D2, satisfying: D2≤D1.

[0102] By setting the first width D1 of the first groove 12 to be larger than the second width D2 of the second groove 15 , when the electrolyte overflows, it will first overflow into the first groove 12 . The wider first groove 12 can receive more electrolyte, thereby improving the anti-overflow effect.

[0103] Optional, such as Figure 2 As shown, the liquid injection portion 10 further includes a boss 16 , and the second groove 15 further includes a fourth side wall 152 opposite to the third side wall 151 . Part of the boss 16 constitutes at least part of the fourth side wall 152 , and the boss 16 protrudes from the first surface 21 .

[0104] Optionally, the shape of the boss 16 can be cylindrical, prismatic, etc., without specific limitation.

[0105] Optional, such as Figure 2 As shown, the boss 16 includes a connecting portion 161 and a flange 162 . The flange 162 is connected to the connecting portion 161 , and the flange 162 protrudes from a surface of the connecting portion 161 facing away from the battery cell.

[0106] Optionally, the cover plate 100 further includes a seal (not shown in the figure) and a cover (not shown in the figure), the seal is suitable for blocking the injection hole 11, and the cover is connected and fixed to the boss 16 to cover the seal, the first groove 12 and the second groove 15.

[0107] Optionally, the sealing member may be made of rubber, silicone, tetrachloroethylene (PTFE), etc., and its shape may correspond to the injection hole 11, without any specific limitation.

[0108] Optionally, the covering member may be a cap, a sealing nail, etc., and the covering member and the boss may be connected by welding, bonding, clamping, screwing, etc., without specific limitation.

[0109] Optionally, the cover member and the boss 16 are fixed by welding, and the welding method may be laser welding, induction brazing, etc., which is not specifically limited.

[0110] Optionally, the cover is welded to the connection portion 161 of the boss 16, and after the welding is completed, the side of the cover facing away from the battery cell is flush with the flange 162 of the boss 16, forming an edge welding effect, thereby better ensuring the air tightness and strength of the welding. On the other hand, the cover and the sealing member are not in contact, which is conducive to preventing the sealing member from being directly heated and causing deformation or melting.

[0111] During welding, the presence of the first groove 12 and / or the second groove 15 can also offset the stress in the sealing component welding process to a certain extent, thereby reducing the risk of welding cracks.

[0112] By setting the liquid injection part 10 also including a boss 16, a part of the boss 16 constitutes at least a part of the fourth side wall 152 of the second groove 15, and the boss 16 protrudes from the first surface 21. The sealing member of the cover plate 100 blocks the liquid injection hole 11, and the covering member is connected and fixed to the boss 16. The boss 16 can provide positioning for the covering member to facilitate assembly, and the covering member and the sealing member are not in contact, which is beneficial to avoid deformation or melting of the sealing member due to direct heat.

[0113] The specific process parameters of the cover plate 100 in one embodiment are introduced below.

[0114] In this embodiment, the first width D1 of the first groove 12 is 0.5 mm, the second width D2 of the second groove 15 is 0.2 mm, and the height difference between the bottom surface of the second groove 15 and the bottom surface of the first groove 12 is 0.8 mm. The diameter of the through hole 142 is 2 mm, the distance from the second side wall 122 to the third side wall 151 (the thickness of the second cylinder 14) is 0.5 mm, and the height of the boss 16 is 0.5 mm.

[0115] In one embodiment, the sealing member is a rubber plug and the covering member is a sealing nail. The assembly process of the sealing member, the covering member and the liquid injection part is as follows:

[0116] First, place the rubber plug at the corresponding position of the injection hole 11 to ensure that the rubber plug is tightly connected to the injection hole 11 .

[0117] Afterwards, the sealing pin is assembled onto the boss 16 of the cover plate 100 using an automated robot, and the sealing pin is ensured to be coaxial with the injection hole 11. In this embodiment, the cover plate 100 is provided with a boss 16 to allow the robot to position it, thereby facilitating the assembly of the sealing pin.

[0118] Afterwards, the sealing pin is pressed by a fixture to fix the position of the sealing pin, and spot welding is used to ensure that the relative position between the cover plate 100 and the sealing pin is fixed. After the spot welding is fixed, a continuous welding machine is used for full welding.

[0119] Finally, post-weld inspection, such as helium inspection, is performed.

[0120] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0121] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A cover plate for a battery device, characterized in that: include: The liquid injection part has a first end surface, and a liquid injection hole and a first groove are arranged from the first end surface and along the thickness direction of the cover plate. The first groove is located at the outer periphery of the liquid injection hole.

2. The cover plate according to claim 1, characterized in that: The liquid injection part includes a first cylinder, which encloses the liquid injection hole, the first groove includes a first side wall, a portion of the outer circumferential surface of the first cylinder is the first side wall, and the first cylinder includes the first end surface, which is connected to the first side wall; the cover plate also includes a fixing part, which is connected to the outer circumference of the liquid injection part, and the fixing part includes a first surface and a second surface opposite to each other, the first surface has the same orientation as the first end surface, and the distance between the first end surface and the second surface is smaller than the distance between the first surface and the second surface.

3. The cover plate according to claim 2, characterized in that: The first cylinder protrudes from the second surface.

4. The cover plate according to claim 2, characterized in that: The first groove is an annular groove.

5. The cover plate according to claim 2, characterized in that: There are a plurality of the first grooves, and the plurality of the first grooves are concentrically arranged and spaced apart along the radial direction of the first cylinder.

6. The cover plate according to claim 2, characterized in that: The liquid injection part also includes a second cylinder, the first groove also includes a second side wall opposite to the first side wall, a portion of the inner circumferential surface of the second cylinder is the second side wall, the second cylinder includes a second end face, the second end face is connected to the second side wall, and the distance between the second end face and the second face is greater than the distance between the first end face and the second face.

7. The cover plate according to claim 6, characterized in that: The liquid injection part also has a second groove, which surrounds the outer circumference of the first groove. The second groove includes a third side wall, a portion of the outer circumferential surface of the second cylinder is the third side wall, and the second end surface is connected to the third side wall.

8. The cover plate according to claim 7, characterized in that: The distance from the bottom wall of the second groove to the second surface is greater than the distance from the bottom wall of the first groove to the second surface.

9. The cover plate according to claim 7, characterized in that: The second cylinder is provided with a through hole, and the through hole passes through the second side wall and the third side wall to connect the first groove and the second groove.

10. The cover plate according to claim 9, characterized in that: There are a plurality of through holes, and the plurality of through holes are arranged at equal intervals along the circumference of the second cylinder.

11. The cover plate according to claim 7, characterized in that: The first groove has a first width D1, and the second groove has a second width D2, satisfying: D2≤D1.

12. The cover plate according to claim 7, characterized in that: The injection portion also includes a boss, and the second groove also includes a fourth side wall opposite to the third side wall, a portion of the boss constitutes at least a portion of the fourth side wall, and the boss protrudes from the first surface; the cover plate also includes a sealing member and a covering member, the sealing member is suitable for blocking the injection hole, and the covering member is connected and fixed to the boss to cover the sealing member, the first groove and the second groove.

13. A battery device, characterized in that: The invention comprises a shell, a battery cell and a cover plate as claimed in any one of claims 1 to 12, wherein the battery cell is accommodated in the shell, and the cover plate is connected to the shell.

14. An electrical device, characterized in that: It comprises an electric device and the battery device as claimed in claim 13, wherein the battery device supplies power to the electric device.

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