CN217239715U - Battery cover plate and battery - Google Patents

Abstract

The application provides a battery cover plate and a battery, and the battery cover plate comprises a cover plate main body, a spherical sealing nail and a welding structure. The cover plate main body is provided with a liquid injection hole which penetrates through the inner surface and the outer surface of the cover plate main body; the spherical sealing nail is positioned in the liquid injection hole and comprises a middle sealing part and a first part which are connected, in the first direction, the first part is positioned between the middle sealing part and the outer surface of the cover plate main body, the size of the first part along the second direction is smaller than that of the middle sealing part along the second direction, the second direction is vertical to the first direction, and the middle sealing part is in interference fit with the inner wall of the part of the liquid injection hole to form a first sealing layer; the welding structure is arranged around the first part and welded between the first part and the inner wall of the liquid injection hole to form a second sealing layer. Two sealing layers are sealed annotating the liquid hole simultaneously, promote the sealed effect to annotating the liquid hole, and welded structure plays the fixed action to spherical seal nail, prevents that spherical seal nail from droing, promotes the security of battery.

Description

Battery cover plate and battery

Technical Field

The application relates to the technical field of batteries, in particular to a battery cover plate and a battery.

Background

The battery cover plate is one of the important components of the battery, and the battery cover plate is provided with a liquid injection hole for injecting electrolyte into the battery or supplementing the electrolyte. In order to prevent the follow-up condition of leaking liquid that appears in notes liquid hole, need seal annotating the liquid hole, adopt spherical sealed nail to impress in annotating the liquid hole with annotate liquid downthehole wall interference fit in order to seal, this kind of sealed mode makes spherical sealed nail have in the use and deviate from or transfer into the inside risk of battery from annotating the liquid hole, the leakproofness is not good and causes the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The application provides a battery cover plate and battery, setting through spherical sealed nail and welded structure, spherical sealed nail and welded structure form first sealing layer and second sealing layer with annotating liquid downthehole wall respectively, two sealing layers are sealed annotating the liquid hole simultaneously, promote the sealed effect to annotating the liquid hole, prevent revealing of electrolyte better, and welded structure plays the fixed action to spherical sealed nail, prevent that spherical sealed nail from dropping to the battery inside or dropping to annotating the liquid hole outside, guarantee to annotate the sealed effect in liquid hole and the security that promotes the battery.

In a first aspect, the present application provides a battery cover plate for use on a battery, the battery cover plate comprising a cover plate body, a spherical seal nail, and a weld structure. The cover plate main body comprises an inner surface and an outer surface which are oppositely arranged along a first direction, the cover plate main body is provided with a liquid injection hole which penetrates through the inner surface and the outer surface of the cover plate main body, and electrolyte is injected into the battery through the liquid injection hole; the spherical sealing nail is positioned in the liquid injection hole and comprises a middle sealing part and a first part which are connected, in the first direction, the first part is positioned between the middle sealing part and the outer surface of the cover plate main body, the size of the first part along the second direction is smaller than that of the middle sealing part along the second direction, the second direction is vertical to the first direction, and the middle sealing part is in contact with part of the inner wall of the liquid injection hole and is in interference fit with the inner wall of the liquid injection hole to form a first sealing layer; the welding structure is welded between the first part and the inner wall of the liquid injection hole and is arranged around the first part, and the first part and the part of the inner wall of the liquid injection hole are sealed to form a second sealing layer.

Wherein the inner surface of the cap plate body is disposed adjacent to the battery interior compared to the outer surface; in one embodiment, the cover plate body is made of metal, metal matrix composite, polymer or polymer composite. The first direction is the axial direction of annotating the liquid hole, the second direction is annotate the radial direction of liquid hole, it includes the opening to annotate the liquid hole, the opening is close to the apron main part the surface sets up, and electrolyte follows the opening gets into it is downthehole to annotate the liquid.

Before the spherical sealing nail is assembled into the liquid injection hole, the diameter of the spherical sealing nail is larger than that of the liquid injection hole; the assembly of spherical sealed nail gets into annotate the liquid hole, through spherical sealed nail or annotate the deformation in liquid hole, spherical sealed nail with annotate liquid hole interference fit, make spherical sealed nail with the inner wall of annotating the liquid hole closely laminates, in order to form first sealing layer is right annotate the liquid hole and seal, prevent revealing of electrolyte. In one embodiment, the material of the spherical sealing nail is metal, metal matrix composite, polymer or polymer composite.

The part of the spherical sealing nail which is in direct contact with the inner wall of the liquid injection hole is the middle sealing part, in one embodiment, the middle sealing part is not in direct contact with the first part, and the distance between the middle sealing part and the first part in the first direction is more than 0. The minimum diameter of the projection of the middle sealing part on the cross section of the liquid injection hole along the first direction is larger than the maximum diameter of the projection of the first part on the cross section of the liquid injection hole along the first direction.

The welded structure will the surface of first part with annotate the inner wall welding in liquid hole, in order to form the second sealing layer, in this application, welded structure is used for connecting annotate the inner wall in liquid hole with spherical sealed nail will welded structure is constantly encircleed the first part sets up, and multiplexing welding constitutes 300 as the second sealing layer, in order to right annotate the liquid hole is sealed. In an embodiment, the spherical sealing nail further comprises a second part, the second part is located on one side, away from the middle sealing part, of the first part, the welding structure only covers the surface of the first part, and the second part is not covered by the welding structure, so that materials of the welding structure are saved. In an embodiment, a projection of the welded structure in the second direction does not coincide or partially coincide with a projection of the second portion in the second direction. Welded structure is right annotate the liquid hole and carry out the secondary seal, just the second sealing layer will spherical sealed nail is fixed annotate on the liquid hole inner wall, reduce spherical sealed nail falls into the inside hidden danger that causes the incident of battery reduces spherical sealed nail drop extremely annotate the liquid hole outside and can not reach sealed effect, promote the security of battery.

Through the arrangement of the spherical sealing nail and the welding structure, on one hand, the welding structure has a fixing effect on the spherical sealing nail, so that the spherical sealing nail is prevented from falling into the battery or falling to the outer side of the liquid injection hole, the sealing effect on the liquid injection hole is ensured, and the safety of the battery is improved; on the other hand, the welding structure is reused as the second sealing layer, the spherical sealing nail is used as the first sealing layer, the two sealing layers simultaneously seal the liquid injection hole, the sealing effect of the liquid injection hole is improved, and leakage of electrolyte is better prevented.

In one possible implementation, the welding structure includes a first sealing surface that is welded to seal with the surface of the first portion, and the ratio of the area of the first portion surface to the first sealing surface welding surface to the surface area of the spherical sealing pin surface is greater than or equal to 1/6 times and less than 1/2 times. The first sealing surface welds and seals the first part with the inner wall of the liquid injection hole to form the second sealing layer; the ratio of the area of the surface of the first part covered by the first sealing surface to the surface area of the spherical sealing nail is greater than or equal to 1/6, so that the welding of the first sealing surface and the inner wall of the liquid filling hole is stable, and the second sealing layer can play a sealing role. In an embodiment, a ratio of an area of a surface of the first portion covered by the first sealing surface to a surface area of the spherical sealing peg is less than or equal to 1/3.

In a possible implementation manner, the welding structure further includes a second sealing surface intersecting and connected to the first sealing surface, the second sealing surface is welded and sealed with the inner wall of the liquid injection hole, and the second sealing surface extends to the opening of the liquid injection hole. In an embodiment, a thickness of the second sealing surface near the opening is smaller than a thickness of the second sealing surface far from the opening, and the thickness of the second sealing surface is a thickness of the second sealing surface in the second direction, so that the thickness of the second sealing surface near the opening is reduced, and welding between the second sealing surface and the inner wall of the liquid filling hole is easier to realize. Through welded structure's setting, increase the second sealed face with annotate the welding area of the inner wall of liquid hole, can promote welded structure's sealed effect.

In one possible implementation, there is a gap between the first sealing layer and the second sealing layer in the first direction. In one embodiment, the spherical sealing nail further comprises a third part located between the middle sealing part and the first part, and the surface of the third part, the welding structure and the inner wall of the liquid injection hole jointly surround to form the gap. Sufficient space is reserved in the setting in clearance, makes welded structure with annotate liquid downthehole wall with first part welding forms during the second sealing layer, it is right to reduce first sealing layer influence layer upon layer, guarantees the sealed effect of first sealing layer.

In a possible implementation manner, the spherical sealing nail further comprises a second part, the second part is located on the side, away from the middle sealing part, of the first part, the size of the second part in the second direction is smaller than that of the first part in the second direction, the welding structure comprises a sealing area and a filling area which are connected, the sealing area is welded between the first part and the inner wall of the liquid injection hole and is arranged around the first part, and the filling area covers the second part and is welded with the second part. The sealing area welds and seals the first part and the inner wall of the liquid injection hole to form the second sealing layer; the periphery of the filling area is connected with the sealing area, and the filling area and the sealing area cover the liquid injection hole together.

In one embodiment, the material of the filling region and the material of the sealing region may be the same or different. Through the filling area with the setting of sealing area has strengthened welded structure's structural strength makes spherical sealed nail with annotate the connection of liquid downthehole wall more firm, the reinforcing the sealed effect of second sealing layer.

In one possible implementation, the filling area fills the pouring hole located outside the intermediate seal. The liquid injection hole on the outer side of the middle sealing part is the liquid injection hole facing the opening from the middle sealing part along the first direction, and the filling area fills the liquid injection hole on the outer side of the middle sealing part, which is not occupied by the sealing area and the spherical sealing nail, so that the sealing effect of the second sealing layer is enhanced.

In one embodiment, the sealing area and the filling area partially overlap in a projection onto a cross section of the pour hole in the first direction. In one embodiment, the filling-space filling portion is located at the pouring hole outside the intermediate sealing portion. In one embodiment, the filling area fills all of the pour holes located outside the intermediate seal portion and not occupied by the seal area and the spherical seal pin.

In one possible implementation, the sealing region and the filling region are of a unitary structure. The intensity of integral structure is higher, the sealed area with the filling zone is connected closely, is difficult for breaking away from, and the reinforcing welded structure is right annotate the sealed effect in liquid hole and will better the spherical sealed nail is fixed on annotating the inner wall in liquid hole.

In a possible implementation manner, the welding structure includes a sealing area and an auxiliary sealing sheet which are connected, the sealing area is welded between the first portion and the inner wall of the liquid injection hole and surrounds the first portion, the peripheral side of the auxiliary sealing sheet is welded with the sealing area, and the auxiliary sealing sheet, the sealing area and the first portion are surrounded to form a closed space. The auxiliary sealing sheet and the sealing area are welded to form the third sealing layer, so that on one hand, the structural strength of the welding structure is improved, and the welding structure and the spherical sealing nail are prevented from being loosened due to external impact to cause leakage of electrolyte; on the other hand, the third sealing layer can enhance the sealing of the liquid injection hole. Supplementary gasket with spherical sealed nail not direct contact, in order to form the enclosure space reduces the welding degree of difficulty of supplementary gasket, and reduces it is right during supplementary gasket welding the better sealed effect of realization is guaranteed to the influence of spherical sealed nail.

In a possible implementation manner, the diameter of the auxiliary sealing sheet is smaller than that of the liquid injection hole. The auxiliary sealing sheet is positioned outside the opening of the liquid injection hole, namely the auxiliary sealing sheet is not positioned inside the liquid injection hole. The diameter of supplementary gasket is less than annotate the diameter in liquid hole, supplementary gasket with the sealed area covers jointly annotate the liquid hole, supplementary gasket is in along first direction the projection on the cross section of annotating the liquid hole is located on annotating the cross section of liquid hole, can reduce the welding degree of difficulty of supplementary gasket.

In a possible implementation manner, the liquid injection hole is a cylindrical hole. The cylindrical hole is formed in the battery cover plate in a machining mode, and the machining process is simple when the liquid injection hole is formed. In a specific embodiment, the liquid injection hole is not strictly a standard cylindrical hole, the liquid injection hole is a cylindrical hole within an error range, and the liquid injection hole can deform within a certain range during welding.

In a second aspect, the present application provides a battery, which includes a battery core, a casing, and the battery cover plate as described above, where the battery cover plate and the casing are connected to form an accommodating space for accommodating the battery core and the electrolyte. The shell is provided with a shell opening, and the battery cover plate covers the shell opening, so that the battery cover plate and the shell are surrounded to form the accommodating space. The battery cover plate is provided with the liquid injection hole for meeting the liquid injection requirement of the battery, and in order to prevent the subsequent liquid leakage of the liquid injection hole, the battery cover plate is further provided with a sealing structure such as a spherical sealing nail and a welding structure for sealing the liquid injection hole.

In an embodiment, the electrolyte injection hole is located on the width central line of the cover plate main body, so that electrolyte can flow into the bottom of the battery core quickly, and the electrolyte injection efficiency is improved. In an embodiment, the electrolyte injection hole is located between two battery cells or between four battery cells, so that the electrolyte can flow into the bottom of the battery cells quickly, and the electrolyte injection efficiency is improved. In one embodiment, the battery is a secondary battery, and may be subjected to repeated charge and discharge cycles, and the battery or the batteries are used for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, and uninterruptible power supplies. In one embodiment, the battery is square or cylindrical and the battery cover plate is rectangular or circular, respectively.

In this application, through spherical sealed nail and welded structure's setting, spherical sealed nail forms first sealing layer with annotating liquid downthehole wall interference fit, welded structure forms the second sealing layer with spherical sealed nail with annotate liquid downthehole wall welding, two sealing layers are sealed annotating the liquid hole simultaneously, promote the sealed effect to annotating the liquid hole, prevent revealing of electrolyte better, and simultaneously, welded structure fixes spherical sealed nail on annotating liquid downthehole wall, prevent that spherical sealed nail from dropping to the battery inside or dropping to annotating the liquid downthehole side, guarantee the sealed effect of spherical sealed nail to annotating the liquid hole and the security that promotes the battery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application;

fig. 2 is a sectional view illustrating a structure of a battery cover plate according to an embodiment of the present disclosure;

FIG. 3 is a top view of a battery cover provided in accordance with an embodiment of the present application;

fig. 4 is a partially enlarged view of a portion M in fig. 2;

fig. 5 is a partial enlarged view of a portion N in fig. 4;

fig. 6 is a partial structural schematic view of a battery cover plate according to an embodiment of the present disclosure;

fig. 7 is a sectional view illustrating a structure of a battery cover plate according to an embodiment of the present application;

FIG. 8 is a top view of a battery cover plate provided in accordance with an embodiment of the present application;

fig. 9 is a partially enlarged view of a portion P of fig. 7;

fig. 10 is a partial structural schematic view of a battery cover plate according to an embodiment of the present disclosure;

fig. 11 is a sectional view illustrating a structure of a battery cover plate according to an embodiment of the present application;

FIG. 12 is a top view of a battery cover provided in accordance with an embodiment of the present application;

fig. 13 is a partial enlarged view of a portion Q in fig. 11.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

Herein, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

Further, where directional terms such as "upper", "lower", etc., are defined herein with respect to a schematically-disposed orientation of a structure in the drawings, it is to be understood that such directional terms are relative concepts that are used for descriptive and clarity purposes relative to the structure, and that they may vary accordingly depending on the orientation in which the structure is disposed.

Referring to fig. 1, in one embodiment of the present disclosure, a battery 1 is provided, where the battery 1 includes a battery cell (not shown in the drawings), a case 11, and a battery cover plate 10, and the battery cover plate 10 and the case 11 are connected to form an accommodating space 13 for accommodating the battery cell and an electrolyte. The case 11 is provided with a case opening 12, and the battery cover 10 covers the case opening 12, so that the battery cover 10 and the case 11 enclose to form an accommodating space 13. Be equipped with on the battery apron 10 and annotate liquid hole 110 for satisfy the notes liquid demand of battery 1, in order to prevent to annotate the follow-up condition that the weeping appears in liquid hole 110, still be equipped with seal structure such as spherical sealed nail 200 and welded structure 300 on the battery apron 10, be used for annotating liquid hole 110 and seal.

In one embodiment, the electrolyte injection hole 110 is located on the width center line of the cover plate main body 100, so that the electrolyte can rapidly flow into the bottom of the battery cell, and the electrolyte injection efficiency is improved. In an embodiment, the electrolyte injection hole 110 is located between two battery cells or between four battery cells, so that the electrolyte can flow into the bottom of the battery cells quickly, and the electrolyte injection efficiency is improved. In one embodiment, the battery 1 is a secondary battery that can perform repeated charge and discharge cycles, and the battery 1 or the plurality of batteries 1 are used for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, and uninterruptible power supplies. In one embodiment, the battery 1 has a square or cylindrical shape and the battery cover 10 has a corresponding rectangular or circular shape.

The battery cover plate 10 of the present application will be described in detail below.

Referring to fig. 2 and 4, fig. 2 is a schematic structural view of a battery cover plate according to the present invention, fig. 4 is a partially enlarged view of a portion M in fig. 2, and a filling pattern of the ball sealing nail 200 in fig. 4 is only shown to divide the ball sealing nail 200, and does not represent a cross section. The present application provides a battery cover plate 10, which is applied to a battery 1, and the battery cover plate 10 includes a cover plate main body 100, a spherical sealing nail 200, and a welding structure 300. The cover plate main body 100 comprises an inner surface 102 and an outer surface 101 which are oppositely arranged along a first direction X, the cover plate main body 100 is provided with a liquid injection hole 110 which penetrates through the inner surface 102 and the outer surface 101 of the cover plate main body 100, and electrolyte is injected into the battery 1 through the liquid injection hole 110; the spherical sealing nail 200 is positioned in the liquid injection hole 110, the spherical sealing nail 200 comprises a middle sealing part 220 and a first part 210 which are connected, in the first direction X, the first part 210 is positioned between the middle sealing part 220 and the outer surface 101 of the cover plate main body 100, the size of the first part 210 along the second direction Y is smaller than that of the middle sealing part 220 along the second direction Y, the second direction Y is perpendicular to the first direction X, and the middle sealing part 220 is in contact with and in interference fit with part of the inner wall of the liquid injection hole 110 to form a first sealing layer 201; the weld structure 300 is welded between the first portion 210 and the inner wall of the pour spout 110 and is disposed around the first portion 110, sealing the first portion 210 and a portion of the inner wall of the pour spout 110 to form a second sealant layer 301.

Wherein, the outer surface 101 of the cover plate main body 100 is located outside the accommodating space 13, and the inner surface 102 is disposed adjacent to the accommodating space 13 compared with the outer surface 101; in one embodiment, the material of the cover plate body 100 is metal, metal matrix composite, polymer or polymer composite. The first direction X is the axial direction of the pour hole 110, the second direction Y is the radial direction of the pour hole 110, the pour hole 110 includes an opening 111, the opening 111 is disposed adjacent to the outer surface 101 of the lid main body 100, and the electrolyte enters the pour hole 110 from the opening 111 and enters the interior of the battery 1 through the pour hole 110. Before the spherical sealing nail 200 is assembled into the liquid injection hole 110, the diameter of the spherical sealing nail 200 is larger than that of the liquid injection hole 110; the spherical sealed nail 200 assembles into annotates liquid hole 110, through the deformation of spherical sealed nail 200 or notes liquid hole 110, and spherical sealed nail 200 and notes liquid hole 110 interference fit make the inner wall of spherical sealed nail 200 and notes liquid hole 110 closely laminate to form first sealing layer 201, seal annotating liquid hole 110, prevent revealing of electrolyte.

In one embodiment, when the ball seal 200 is fitted into the pour hole 110, the ball seal 200 is deformed by the pour hole 110, and the pour hole 110 is not deformed. In one embodiment, when the ball seal nail 200 is fitted into the pour hole 110, the pour hole 110 is deformed, and the ball seal nail 200 is not deformed. In one embodiment, when the ball-shaped sealing nail 200 is fitted into the injection hole 110, the injection hole 110 is compressed by the ball-shaped sealing nail 200 and deformed, and the ball-shaped sealing nail 200 is pressed by the ball-shaped sealing nail 200 and deformed. In one embodiment, the material of the spherical sealing nail 200 is metal, metal matrix composite, polymer or polymer composite.

The part of the spherical sealing nail 200 directly contacting the inner wall of the pour hole 110 is the middle sealing part 220 (as shown in FIG. 4), and the first part 210 of the spherical sealing nail 200 is arranged closer to the opening 111 of the pour hole 110 than the middle sealing part 220; in the present embodiment, the intermediate sealing part 220 is not disposed in direct contact with the first part 210, and the distance between the intermediate sealing part 220 and the first part 210 in the first direction X is greater than 0. The center of the sphere of the spherical sealing pin 200 is located in the middle sealing part 220, the projection of the middle sealing part 220 on the cross section of the pour hole 110 along the first direction X is a circular ring, the projection of the first part 210 on the cross section of the pour hole 110 along the first direction X is a circular ring or a circle, and the minimum diameter of the projection of the middle sealing part 220 on the cross section of the pour hole 110 along the first direction X is larger than the maximum diameter of the projection of the first part 210 on the cross section of the pour hole 110 along the first direction X.

The weld structure 300 welds the surface of the first part 210 to the inner wall of the pour spout 110 to form the second sealant layer 301. in this application, the weld structure 300 is used to connect the inner wall of the pour spout 110 to the ball seal peg 200. the weld structure 300 is positioned continuously around the first part 210, and the weld structure 300 is reused as the second sealant layer 301 to seal the pour spout 110. In an embodiment, the spherical sealing nail 200 further includes a second portion 230, the second portion 230 is located on a side of the first portion 210 away from the middle sealing portion 220, the welding structure 300 only covers a surface of the first portion 210, and the second portion 230 is not covered by the welding structure 300 (as shown in fig. 3 and 4), so that material consumption of the welding structure 300 is reduced.

In one embodiment, the projection of the welded structure 300 in the second direction Y is not coincident or partially coincident with the projection of the second portion 230 in the second direction Y (as shown in fig. 6). Welded structure 300 carries out the secondary to annotating liquid hole 110 and seals, and second sealing layer 301 fixes spherical sealed nail 200 on annotating liquid hole 110 inner wall, reduces spherical sealed nail 200 and falls into the inside hidden danger that causes the incident of battery 1, reduces spherical sealed nail 200 and drops to annotating outside the liquid hole 110 and can not reach sealed effect, promotes battery 1's security.

Through the arrangement of the spherical sealing nail 200 and the welding structure 300, on one hand, the welding structure 300 has a fixing effect on the spherical sealing nail 200, so that the spherical sealing nail 200 is prevented from falling into the battery 1 or falling out of the liquid injection hole 110, the sealing effect on the liquid injection hole 110 is ensured, and the safety of the battery 1 is improved; on the other hand, the multiplexing welded structure 300 is used as the second sealing layer 301, the spherical sealing nail 200 is used as the first sealing layer 201, and the two sealing layers simultaneously seal the liquid injection hole 110, so that the sealing effect on the liquid injection hole 110 is improved, and the leakage of the electrolyte is better prevented.

In one possible implementation, the welding structure 300 includes a first sealing surface 311, the first sealing surface 311 is welded and sealed with the surface of the first part 210 (as shown in fig. 4), and the ratio of the area of the surface of the first part 210 and the welding surface of the first sealing surface 311 to the surface area of the surface of the spherical sealing nail 200 is greater than or equal to 1/6 times and less than 1/2 times. The first sealing surface 311 welds and seals the first part 210 with the inner wall of the pour hole 110 to form a second sealing layer 301; the ratio of the surface area of the first part 210 covered by the first sealing surface 311 to the surface area of the spherical sealing nail 200 is greater than or equal to 1/6, so that the welding of the first sealing surface 311 and the inner wall of the pour hole 110 is stable and the second sealing layer 301 can play a sealing role. In an embodiment, the ratio of the area of the surface of the first portion 210 covered by the first sealing surface 311 to the surface area of the spherical sealing peg 200 is less than or equal to 1/3.

In one possible implementation, the welding structure 300 further includes a second sealing surface 312 (shown in FIG. 4) intersecting and connected to the first sealing surface 311, the second sealing surface 312 is welded and sealed with the inner wall of the pour hole 110, and the second sealing surface 312 extends to the opening 111 of the pour hole 110. In one embodiment, the thickness of the second sealing surface 312 near the end of the opening 111 is smaller than the thickness of the second sealing surface 312 far from the end of the opening 111, the thickness of the second sealing surface 312 is the thickness of the second sealing surface 312 in the second direction Y, and the thickness of the second sealing surface 312 near the end of the opening 111 is reduced, so that the welding between the second sealing surface 312 and the inner wall of the pour hole 110 is easier. By arranging the welding structure 300, the welding area between the second sealing surface 312 and the inner wall of the liquid injection hole 110 is increased, and the sealing effect of the welding structure 300 can be improved.

In one possible implementation, in the first direction X, there is a gap 302 (as shown in fig. 4 and 5) between the first sealing layer 201 and the second sealing layer 301. In one embodiment, the ball seal nail 200 further includes a third portion 240, the third portion 240 is located between the middle seal 220 and the first portion 210, and the surface of the third portion 240, the weld structure 300, and the inner wall of the pour hole 110 collectively form a gap 302 therebetween. The gap 302 is provided to reserve enough space, so that when the welding structure 300 is welded with the inner wall of the liquid injection hole 110 and the first part 210 to form the second sealing layer 301, the influence on the first sealing layer 201 is reduced, and the sealing effect of the first sealing layer 201 is ensured.

In one possible implementation, the spherical sealing nail 200 further includes a second portion 230 (as shown in fig. 7 and 9), the second portion 230 is located on a side of the first portion 210 away from the middle sealing portion 220, a dimension of the second portion 230 in the second direction Y is smaller than a dimension of the first portion 210 in the second direction Y, the welding structure 300 includes a sealing area 310 and a filling area 320 which are connected, the sealing area 310 is welded between the first portion 210 and an inner wall of the pour hole 110 and is arranged around the first portion 210, and the filling area 320 covers the second portion 230 and is welded with the second portion 230. The middle sealing part 220, the first part 210 and the second part 230 are sequentially arranged along the first direction X, and the middle sealing part 220, the first part 210 and the second part 230 are sequentially reduced in size along the second direction Y; the sealing area 310 welds and seals the first part 210 with the inner wall of the pour hole 110 to form a second sealant 301; the peripheral side of the filling zone 320 is connected to the sealing zone 310, and the filling zone 320 and the sealing zone 310 together cover the pour hole 110 (as shown in fig. 8 and 9).

In one embodiment, the material of the filling region 320 is the same as that of the sealing region 310. In one embodiment, the material of the filling region 320 is different from that of the sealing region 310. Through the setting of filling area 320 and sealing area 310, strengthened welded structure 300's structural strength, make the connection of spherical sealing nail 200 and notes liquid hole 110 inner wall more firm, strengthen the sealed effect of second sealing layer 301.

In one possible implementation, the filling area 320 fills the pour hole 110 located outside the middle seal 220. The pour hole 110 outside the middle seal portion 220 is the pour hole 110 facing the opening 111 in the first direction X from the middle seal portion 220, and the filling section 320 fills the pour hole 110 outside the middle seal portion 220 that is not occupied by the seal section 310 and the ball seal nail 200, thereby enhancing the sealing effect of the second sealant layer 301. In one embodiment, the seal area 310 and the fill area 320 partially overlap in a projection in the first direction X onto a cross-section of the pour spout 110. In one embodiment, the filling area 320 fills the pour hole 110 (shown in FIG. 10) partially outside the intermediate seal 220. In the present embodiment, the filling area 320 fills all of the pour holes 110 (shown in fig. 9) located outside the intermediate seal portion 220 and not occupied by the seal area 310 and the ball seal nails 200.

In one possible implementation, the sealing region 310 and the filling region 320 are of a unitary structure. The strength of the integrated structure is higher, the sealing area 310 and the filling area 320 are tightly connected and are not easy to separate, the sealing effect of the welding structure 300 on the liquid injection hole 110 is enhanced, and the spherical sealing nail 200 is better fixed on the inner wall of the liquid injection hole 110.

In one possible implementation, the welding structure 300 includes a sealing area 310 and an auxiliary sealing sheet 330 (as shown in fig. 11 and 13) connected to each other, the sealing area 310 is welded between the first portion 210 and the inner wall of the pour hole 110 and is disposed around the first portion 210, the peripheral side of the auxiliary sealing sheet 330 is welded to the sealing area 310, and the auxiliary sealing sheet 330, the sealing area 310 and the first portion 210 enclose the enclosed space 303.

The auxiliary sealing piece 330 and the sealing area 310 are welded to form a third sealing layer 331, on one hand, the structural strength of the welding structure 300 is improved, and the welding structure 300 and the spherical sealing nail 200 are prevented from being loosened due to external impact, so that electrolyte leakage is prevented; on the other hand, the third sealing layer 331 may enhance sealing of the pour spout 110. Supplementary gasket 330 and spherical sealed nail 200 direct contact not to form enclosure space 303, reduce supplementary gasket 330's the welding degree of difficulty, and reduce the influence to spherical sealed nail 200 when supplementary gasket 330 welds, guarantee to realize better sealed effect.

In one possible implementation, the diameter of the auxiliary sealing fin 330 is smaller than the diameter of the liquid injection hole 110. The auxiliary sealing fin 330 is located outside the opening 111 of the pour hole 110, i.e., the auxiliary sealing fin 330 is not located inside the pour hole 110. The diameter of the auxiliary sealing fin 330 is smaller than the diameter of the pour hole 110, the auxiliary sealing fin 330 and the sealing area 310 together cover the pour hole 110 (as shown in fig. 12 and 13), and the projection of the auxiliary sealing fin 330 on the cross section of the pour hole 110 along the first direction X is located on the cross section of the pour hole 110, which can reduce the welding difficulty of the auxiliary sealing fin 330. The cross section of the pour hole 110 is a cross section obtained by cutting the pour hole 110 perpendicularly in the second direction Y.

In one possible implementation, the pour hole 110 is a cylindrical hole (as shown in FIGS. 2, 7, and 11). The cylindrical hole is provided, so that the processing technology is simple when the liquid injection hole 110 is formed in the battery cover plate 10. In a specific embodiment, the pour hole 110 is not strictly a standard cylindrical hole, the pour hole 110 is a cylindrical hole within a tolerance range, and the pour hole 110 is deformed within a certain range during welding.

The above detailed description is provided for the battery cover plate and the battery provided in the embodiments of the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the above description of the embodiments is only used to help understanding the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (11)

1. A battery cover plate for use with a battery, the battery cover plate comprising:

the cover plate main body comprises an inner surface and an outer surface which are oppositely arranged along a first direction, the cover plate main body is provided with a liquid injection hole which penetrates through the inner surface and the outer surface of the cover plate main body, and electrolyte is injected into the battery through the liquid injection hole;

the spherical sealing nail is positioned in the liquid injection hole and comprises a middle sealing part and a first part which are connected, in the first direction, the first part is positioned between the middle sealing part and the outer surface of the cover plate main body, the size of the first part along the second direction is smaller than that of the middle sealing part along the second direction, the second direction is vertical to the first direction, and the middle sealing part is in contact with part of the inner wall of the liquid injection hole and is in interference fit with the inner wall of the liquid injection hole to form a first sealing layer;

and the welding structure is welded between the first part and the inner wall of the liquid injection hole and is arranged around the first part, and the first part and the part of the inner wall of the liquid injection hole are sealed to form a second sealing layer.

2. The battery cover plate of claim 1, wherein the welding structure comprises a first sealing surface that welds to the surface of the first portion, and the ratio of the area of the surface of the first portion to the welding surface of the first sealing surface to the surface area of the surface of the spherical sealing nail is greater than or equal to 1/6 times and less than 1/2 times.

3. The battery cover plate according to claim 2, wherein the welding structure further comprises a second sealing surface intersecting and connected to the first sealing surface, the second sealing surface being welded and sealed to the inner wall of the pour hole, the second sealing surface extending to the opening of the pour hole.

4. The battery cover plate of claim 1, wherein there is a gap between the first sealant and the second sealant in the first direction.

5. The battery lid plate according to any one of claims 1 to 4, wherein the spherical sealing nail further comprises a second portion located on a side of the first portion remote from the intermediate sealing portion, the second portion having a smaller dimension in the second direction than the first portion, the welded structure comprising a sealing zone and a filling zone connected, the sealing zone being welded between the first portion and the inner wall of the pour hole and disposed around the first portion, the filling zone covering the second portion and being welded to the second portion.

6. The battery lid plate according to claim 5, wherein the filling section fills the pour hole located outside the intermediate seal portion.

7. The battery cover plate according to claim 5, wherein the sealing region and the filling region are of a unitary structure.

8. The battery lid according to any one of claims 1 to 4, wherein the welded structure includes a sealing land welded between the first portion and the inner wall of the liquid inlet and provided around the first portion, and an auxiliary sealing sheet welded at its peripheral side to the sealing land, the auxiliary sealing sheet, the sealing land, and the first portion enclosing a closed space.

9. The battery lid according to claim 8, wherein the auxiliary sealing sheet has a diameter smaller than that of the pour hole.

10. The battery cover plate according to any one of claims 1 to 4, wherein the liquid injection hole is a cylindrical hole.

11. A battery, characterized in that the battery comprises a battery core, a casing and the battery cover plate of any one of claims 1 to 10, the battery cover plate and the casing are connected to form a containing space for containing the battery core and the electrolyte.

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