Battery

Abstract

The utility model discloses a battery which comprises a current collecting plate and a pole, the current collecting plate comprises a current collecting plate body and a protruding part protruding out of the current collecting plate body along the axial direction, and the outer diameter of the protruding part is a; a first through hole is formed in the pole in the axial direction, the first through hole sequentially comprises a first hole and a second hole from inside to outside in the axial direction, the maximum value of the diameter range of the first hole is b, the minimum value of the diameter range of the second hole is c, b is smaller than c, and a is smaller than c; the protruding part is located in the first through hole and connected with the pole in a welded mode, a first welding seam is formed in the welded connection position, the distance d between the first welding seam and the edge of the second hole in the radial direction of the second hole is larger than or equal to 0.2 mm and smaller than or equal to 1.5 mm. Therefore, according to the battery, the protruding part of the current collecting disc and the first through hole are arranged in a nested mode, welding is carried out in the nested area, the welding position is arranged outside the cylindrical battery structure, visual welding can be achieved, the welding quality can be guaranteed, and overcurrent is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries. Background Art

[0002] The battery includes components such as a shell, a pole, a collector plate, and a cell. Before the cell is placed in the shell, the pole end is insulated and sealed between the pole and the shell through a sealing ring and insulating plastic. After the cell is placed in the shell, the pole and the collector plate are penetrated and welded, and the internal welding condition cannot be observed. The welding quality is difficult to control, and the assembly process under this structural form is complex and difficult, and the defective rate of finished batteries is high. The visual welding structure currently used can directly observe the welding condition, but excessive energy during welding will produce thermal effects at the edge of the weld mark, resulting in irreversible physical changes in the pole and / or collector plate near the welding position, and these changes may cause the resistance to change accordingly, affecting the overcurrent. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a battery, in which the protrusion and the first through hole are nested and welding is performed in the nested area so that the welding position is placed outside the cylindrical battery structure, which can realize visual welding without affecting the overcurrent.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A battery comprising:

[0006] A current collecting plate, the current collecting plate comprising a current collecting plate body and a protrusion protruding from the current collecting plate body in the axial direction, the outer diameter of the protrusion is a;

[0007] A pole, wherein the pole is provided with a first through hole along the axial direction, wherein the first through hole includes a first hole and a second hole in sequence from the inside to the outside along the axial direction, wherein the maximum value of the diameter range of the first hole is b, and the minimum value of the diameter range of the second hole is c, where b<c, a<c;

[0008] The protrusion is located in the first through hole and is welded to the pole;

[0009] A first weld is formed at the welded connection, and along the radial direction of the second hole, the first weld is at a distance d from the edge of the second hole, 0.2 mm ≤ d ≤ 1.5 mm;

[0010] Optionally, in the above battery, (cb) / 2≥0.2mm.

[0011] Optionally, in the above battery, a diameter b of the first hole gradually increases from inside to outside along the axial direction.

[0012] Optionally, in the above battery, the protrusion and the current collecting disc body are an integrally formed structure.

[0013] Optionally, in the above battery, the protrusion includes a circumferential side wall and an end cover, and a cavity enclosed by the circumferential side wall and the end cover;

[0014] The collecting plate body is provided with a second through hole, and the circumferential outer wall is connected to the collecting plate body at the edge of the second through hole.

[0015] Optionally, in the above battery, the protrusion is welded to the current collecting plate body, and the protrusion is a solid structural member.

[0016] Optionally, in the above battery, the protrusion height of the protrusion is h1, the height of the pole is h2, and h1>h2.

[0017] Optionally, in the above battery, 0mm

[0018] Optionally, in the above battery, the weld width of the first weld is w, 0.2 mm ≤ w ≤ 2.0 mm;

[0019] And / or, the penetration depth of the first weld is h3, 0.2mm≤h3≤2.0mm.

[0020] Optionally, in the above battery, the depth of the second hole in the axial direction is h4, 0.1 mm≤h4≤1 mm;

[0021] and / or, the second hole has an axial depth of h4, 0.5 mm ≤ h3 / h4 ≤ 6 mm;

[0022] and / or, the penetration depth and the distance d between the first weld and the edge of the second hole satisfy: w≤2d;

[0023] And / or, the fusion depth and the fusion width satisfy: 0.5≤h3 / w≤3. Optionally, the battery further comprises a seal, which is sleeved on the outside of the pole and at least partially abuts against the outer surface of the pole to isolate the pole from the battery housing.

[0024] Optionally, in the above battery, the pole includes a first pole region, a second pole region and a third pole region in sequence from inside to outside along the axial direction, the outer diameter of the first pole region is d, the outer diameter of the second pole region is e, and the outer diameter of the third pole region is f, d>e, f>e, e>c;

[0025] ​The sealing member includes a first portion, a second portion and a third portion in sequence from the inside to the outside along the axial direction, the inner diameters of the first portion, the second portion and the third portion are all g, g is matched with e, and the outer wall of the second column area abuts against the inner walls of the first portion, the second portion and the third portion;

[0026] The shell abuts against the outer wall of the second portion.

[0027] Optionally, in the above battery, the sealing member further comprises a fourth portion connected to the free end of the third portion, and the inner diameter of the fourth portion is i;

[0028] i and f are adapted, and the outer wall of the third column area abuts against the inner wall of the fourth part.

[0029] Optionally, the above battery further comprises a gasket, which is sleeved on the outside of the pole and arranged between the pole and the sealing member along the axial direction;

[0030] The thickness of the gasket is h4, the height of the first portion is h5, the height of the second portion is h6, the height of the third portion is h7, the height of the second column region is h8, and h4+h5+h6+h7=h8.

[0031] Optionally, in the above battery, the sum of the area of ​​the outer end surface of the collector plate body and the area of ​​the outer wall surface of the protrusion is S1, the sum of the area of ​​the inner wall surface of the pole and the inner end surface of the pole is S2, and the effective contact area between the pole and the collector plate is S3, S3=S1∩S2, S1≥nC / K; S2≥nC / K; S3≥nC / K; S1=I1 / K; S2=I2 / K;

[0032]

[0033] Wherein, Kt is the temperature coefficient of resistance, the unit is ppm / ℃, and the measurement environment temperature is 25℃;

[0034] S is the area through which the current flows, in mm 2 ;

[0035] △T is the temperature rise, the unit is ℃; ρ is the resistivity, the unit is Ω*cm, and the measurement environment temperature is 25℃;

[0036] K is the current carrying capacity per unit area of ​​metal, unit is A / mm 2 ;

[0037] C is the cell capacity, in Ah; I1 is the current of the pole, in A;

[0038] I2 is the current of the collector disk, in A; n is a constant.

[0039] Optionally, in the above battery, along the radial direction, the connection between the protrusion and the current collecting plate body is a first chamfered angle at a cross section of an outer wall surface of the protrusion, and the radius thereof is r1;

[0040] Along the radial direction, the cross section at the intersection of the inner end surface of the pole and the first through hole is a second chamfer, and the radius thereof is r2, where r2≥r1.

[0041] Optionally, in the above-mentioned battery, the battery includes a cylindrical battery and a square battery.

[0042] It can be seen from the above technical solution that the battery provided by the utility model is nested between the protrusion of the collecting plate and the first through hole, and welding is performed in the nested area, so that the welding position is placed outside the cylindrical battery structure, which can realize visual welding and ensure welding quality. At the same time, the first through hole includes a first hole and a second hole in sequence from the inside to the outside along the axial direction. The maximum value of the diameter range of the first hole is b, and the minimum value of the diameter range of the second hole is c, b<c, which can make the welding weld within the height range of the second hole, ensuring that the weld between the collecting plate and the pole is not higher than the upper surface of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 The structure explosion of the pole and the collecting plate provided in the embodiment of the utility model Figure 1 ;

[0045] Figure 2 The structure explosion of the pole and the collecting plate provided in the embodiment of the utility model Figure 2 ;

[0046] Figure 3 A schematic diagram of the structure of a current collecting plate provided in an embodiment of the utility model;

[0047] Figure 4 A cross-sectional view of a cylindrical battery pole end provided by an embodiment of the utility model;

[0048] Figure 5 A schematic diagram of the structure of the current collecting plate provided in an embodiment of the utility model;

[0049] Figure 6 A cross-sectional view of a square battery pole provided in an embodiment of the utility model.

[0050] in:

[0051] 1-current collecting plate, 11-current collecting plate body, 12-protrusion, 13-first chamfer,

[0052] 2-pole,

[0053] 21-first through hole, 22-first column area, 23-second column area, 24-third column area, 25-second chamfer,

[0054] 3-seal, 31-first part, 32-second part, 33-third part, 34-fourth part;

[0055] 4-shell, 5-gasket. DETAILED DESCRIPTION

[0056] 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 in 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.

[0057] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model 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 utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0058] like Figures 1 to 5 As shown, an embodiment of the utility model provides a battery.

[0059] First, the battery includes a current collecting plate 1 and a pole 2, wherein the current collecting plate 1 includes a current collecting plate body 11 and a protrusion 12 protruding axially from the current collecting plate body 11, and the outer diameter of the protrusion 12 is a; the pole 2 is provided with a first through hole 21 along the axial direction, and the first through hole 21 includes a first hole and a second hole in sequence from the inside to the outside along the axial direction, the maximum value of the diameter range of the first hole is b, and the minimum value of the diameter range of the second hole is c, b<c, a<c; the protrusion 12 is located in the first through hole 21 and is welded to the pole 2. It should be noted that from the inside to the outside refers to the direction from the inside of the battery to the outside of the battery, which will not be annotated one by one in the following text. In addition, the first through hole 21 can be circular, polygonal, elliptical, or runway-shaped. The specific shape of the first through hole 21 can be specifically designed by those skilled in the art according to actual needs. When the first through hole 21 is a polygon, the diameter of the first through hole 21 is the diameter of the inscribed circle of the polygon; when the first through hole 21 is an ellipse, the diameter of the first through hole 21 is the length of the minor axis of the ellipse; when the first through hole 21 is a racetrack, the diameter of the first hole is the spacing between two parallel racetracks. In addition, the central axis of the first through hole 21 coincides with the central axis of the pole 2. At the same time, the circumferential shape of the protrusion 12 is the same as the shape of the first through hole 21, which facilitates the protrusion 12 to extend into the first through hole 21 and connect with the pole 2, so that the connection area can be relatively large, wherein the connection refers to welding connection in some areas, and fitting or abutting connection in some areas.

[0060] It can be seen that the battery provided by the embodiment of the utility model is nested between the protrusion 12 of the current collecting plate 1 and the first through hole 21, and welding is performed in the nested area, so that the welding position is placed outside the cylindrical battery structure, which can achieve visual welding and ensure welding quality. At the same time, the first through hole 21 includes a first hole and a second hole in sequence from the inside to the outside along the axial direction. The maximum value of the diameter range of the first hole is b, and the minimum value of the diameter range of the second hole is c, b<c, which can make the welding weld within the height range of the second hole, ensuring that the weld between the current collecting plate 1 and the pole 2 is not higher than the upper surface of the pole 2.

[0061] In a specific implementation, (cb) / 2≥0.2 mm, which can better ensure the welding effect of the pole 2 and the collector plate 1.

[0062] In a specific implementation, the diameter b of the first hole gradually increases from the inside to the outside along the axial direction. That is, the hole wall of the first hole can be a conical surface, and the opening of the conical surface faces the side away from the inside of the battery. However, it is not limited to this. The diameter b of the first hole can also be a custom one, that is, the hole wall of the first hole is a cylindrical surface, and those skilled in the art can make a specific design according to actual needs.

[0063] In specific implementation, the protrusion 12 and the collector disc body 11 are an integrally formed structure. The collector disc 1 is stamped with the protrusion 12. The integrally formed collector disc 1 can avoid the joint surface in the traditional assembly method, reduce the weak points at the joint, and help improve the overall structural strength. The central axis of the collector disc 1 coincides with the central axis of the concentrated first through hole 21, and the bottom surface of the pole 2 abuts against the side of the collector disc body 11 that is away from the winding core. The side of the collector disc body 11 close to the battery cell is connected to the winding core.

[0064] In a specific implementation, the protrusion 12 includes a circumferential side wall 121 and an end cover 122, and a cavity enclosed by the circumferential side wall 121 and the end cover 122; the collector plate body 11 is provided with a second through hole, and the circumferential side wall 121 is connected to the collector plate body 11 at the edge of the second through hole. That is, the cavity is not a closed cavity, and the cavity can be connected to the outside through the second through hole. The cavity can accommodate more electrolyte, which can not only reduce the weight, but also improve the energy density of the battery.

[0065] For specific implementation, see Figure 3 The protrusion 12 is welded to the collector plate body 11, and the protrusion 12 is a solid structural member. The protrusion 12 and the collector plate body 11 are two separate parts, which are welded together. The collector plate body 11 does not have a through hole at the position where the protrusion 12 is connected, and the protrusion 12 is a solid structure. The bottom surface of the protrusion 12 is in close contact with the upper surface of the first collector plate and welded to provide a larger contact area for the connection between the two, making the connection more stable. In addition, the protrusion 12 of the solid structure has a strong current flow capacity, which can increase the current flow capacity between the collector plate 1 and the pole 2 here.

[0066] In specific implementation, the welding area of ​​the pole 2 and the collector plate 1 is preferably made of the same material and homogeneous welding, which has a better welding effect, is easy to meet the air tightness requirements of the weld, and improves the yield rate.

[0067] In a specific implementation, the protruding height of the protruding portion 12 is h1, the height of the pole 2 is h2, and h1>h2.

[0068] In specific implementation, 0mm

[0069] In specific implementation, a first weld is formed at the welding connection, and the weld width of the first weld is w, 0.2mm≤w≤2.0mm, specifically, w can be 0.2mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, etc.; and / or, the weld depth of the first weld is h3, 0.2mm≤h3≤2.0mm, specifically, h3 can be 0.2mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, etc. The weld width and weld depth are kept within the above ranges, which can maintain the strength of the material and the aesthetic appearance, and at the same time can meet the welding strength. ​

[0070] During specific implementation, along the radial direction of the second hole, the distance between the first weld and the edge of the second hole is d, 0.2mm≤d≤1.5mm, specifically, d can be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, etc., d is not greater than 1.5mm, which can avoid excessive energy during welding, resulting in heat-affected zones in the poles and / or collectors around the weld marks, and the heat-affected zones can cause irreversible physical changes in the material, such as hardness, crystal structure, elastic modulus, etc. If physical changes occur, the overcurrent will be affected. Therefore, it is necessary to control the range of the heat-affected zone so that the heat-affected zone does not spread to the top surface of the pole. When the top surface of the pole is welded to the busbar of the module, the welding area will not be reduced due to the presence of the heat-affected zone, thereby affecting the overcurrent; at the same time, d is not less than 0.2mm, which can ensure that the weld width is within a certain range without causing poor welding problems;

[0071] And / or, the depth of the second hole in the axial direction is h4, 0.1mm≤h4≤1mm, specifically, d can be 0.1mm, 0.25mm, 0.5mm, 0.8mm, 1mm, etc., h4 is not less than 0.1mm, which can prevent the molten metal from exceeding the top surface of the pole after welding, and when the top surface of the pole and the busbar are welded, the busbar welding will not be mismatched due to the presence of molten metal; at the same time, h4 is not greater than 1mm, which avoids compressing the external space of the battery during packing, thereby reducing the energy density in disguise and avoiding waste of materials;

[0072] And / or, the axial depth of the second hole is h4, 0.5mm≤h3 / h4≤6mm, when h3 / h4 is kept within this range, the welding strength can be ensured and the heat affected zone can be prevented from spreading to the top surface of the pole;

[0073] And / or, the penetration depth and the distance d between the first weld and the edge of the second hole satisfy: w≤2d. When this relationship is satisfied, the welding strength can be ensured and the heat-affected zone can be prevented from spreading to the top surface of the pole;

[0074] And / or, the fusion depth and the fusion width satisfy: 0.5≤h3 / w≤3. When this relationship is satisfied, the welding strength between the collector plate and the pole can be ensured to avoid poor welding.

[0075] In specific implementation, the minimum current-carrying area of ​​the first weld is S4, S4= ,

[0076]

[0077] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 , and the measurement environment temperature is 25℃.

[0078] In the specific implementation, it also includes a seal 3, which is sleeved on the outside of the pole 2 and at least partially abuts against the outer surface of the pole 2 to isolate the pole 2 from the battery shell 4. The seal 3 is made of a material with insulation and a certain elasticity. The seal 3 is located between the pole 2 and the shell 4 to isolate the pole 2 from the shell 4, so that the pole 2 and the shell 4 are insulated and deformed to a certain extent under the pressure of the shell 4 and the pole 2, thereby playing a sealing role. It should be noted that the seal 3 includes plastics such as PBT, PFA, and PPS, but is not limited thereto. The specific material of the seal 3 can be specifically designed by those skilled in the art according to actual needs.

[0079] In specific implementation, the pole 2 includes the first column area 22, the second column area 23 and the third column area 24 in the axial direction from the inside to the outside, the outer diameter of the first column area 22 is d, the outer diameter of the second column area 23 is e, and the outer diameter of the third column area 24 is f, d>e, f>e, e>c; to ensure the compact structure and flow rate of the pole 2; the shapes of the first column area 22, the second column area 23 and the third column area 24 can be the same or different, and can be circular or polygonal. If it is a polygon, it is preferably a regular polygon. It should be noted that if it is a polygon, the outer diameter of the polygonal column area is the diameter of the inscribed circle of the polygon. In addition, the pole 2 can be an integrated structural part or each part can be set separately and connected together by welding. The seal 3 includes a first part 31, a second part 32 and a third part 33 in the axial direction from the inside to the outside. The inner diameters of the first part 31, the second part 32 and the third part 33 are all g, and g is adapted to e. The outer wall of the second column area 23 abuts against the inner walls of the first part 31, the second part 32 and the third part 33; the shell 4 abuts against the outer wall of the second part 32.

[0080] In specific implementation, the seal 3 further includes a fourth portion 34 connected to the free end of the third portion 33 , the inner diameter of the fourth portion 34 is i; i is matched with f, and the outer wall of the third column area 24 abuts against the inner wall of the fourth portion 34 .

[0081] In a specific implementation, it also includes a gasket 5, which is sleeved on the outside of the pole 2 and axially arranged between the pole 2 and the seal 3; the thickness of the gasket 5 is h4, the height of the first part 31 is h5, the height of the second part 32 is h6, the height of the third part 33 is h7, and the height of the second column area 23 is h8, h4+h5+h6+h7=h8. The pole 2 passes through the shell 4, the seal 3 and the gasket 5 to form a riveted structure, which can better fix the pole 2 and the shell 4.

[0082] In a specific implementation, the sum of the area of ​​the outer end surface of the collector plate body 11 and the area of ​​the outer wall surface of the protrusion 12 is S1, the sum of the area of ​​the inner wall surface of the pole 2 and the inner end surface of the pole 2 is S2, and the effective contact area between the pole 2 and the collector plate 1 is S3, S3=S1∩S2, S1≥nC / K; S2≥nC / K; S3≥nC / K; S1=I1 / K; S2=I2 / K;

[0083]

[0084] Wherein, Kt is the temperature coefficient of resistance, the unit is ppm / ℃, and the measurement environment temperature is 25℃;

[0085] S is the area through which the current flows, in mm 2 ;

[0086] △T is the temperature rise, the unit is ℃; ρ is the resistivity, the unit is Ω*cm, and the measurement environment temperature is 25℃;

[0087] K is the current carrying capacity per unit area of ​​metal, in A / mm 2 ;

[0088] C is the cell capacity, in Ah; I1 is the current of pole 2, in A;

[0089] I2 is the current of the collector plate 1, in A; n is a constant.

[0090] In specific implementation, along the radial direction, the section of the outer wall surface of the protrusion 12 at the connection between the protrusion 12 and the collector plate body 11 is a first chamfer 13, whose radius is r1; along the radial direction, the section of the intersection of the inner end surface of the pole 2 and the first through hole 21 is a second chamfer 25, whose radius is r2, r2 ≥ r1. This facilitates the assembly of the pole 2 and the collector plate 1, and is conducive to better contact between the two and contact flow.

[0091] In specific implementation, the battery includes cylindrical batteries and square batteries. The cylindrical battery can be single-pass or double-pass, and can also be a single pole column 2 and a double pole column 2, wherein the collector plate 1 is circular, but not limited to a circular shape; the collector plate 1 in the square battery can be polygonal, and the top cover of the square battery is provided with positive and negative poles 2, a liquid injection hole and an explosion-proof valve, etc. It should be noted that, for details, see Figure 5 The pole 2 end of the square battery is connected to the top cover, and the insulating member and the gasket 5 are arranged between the pole 2 and the top cover, that is, the top cover in the square battery is equivalent to the shell 4 at the end of the pole 2 of the cylindrical battery.

[0092] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, characterized in that: include: A current collecting plate (1), the current collecting plate (1) comprising a current collecting plate body (11) and a protruding portion (12) protruding axially from the current collecting plate body (11), the outer diameter of the protruding portion (12) being a; A pole (2), the pole (2) being provided with a first through hole (21) along the axial direction, the first through hole (21) comprising a first hole and a second hole in sequence from the inside to the outside along the axial direction, the maximum value of the diameter range of the first hole being b, the minimum value of the diameter range of the second hole being c, b<c, a<c; The protruding portion (12) is located in the first through hole (21) and is welded to the pole (2); A first weld is formed at the welded connection. Along the radial direction of the second hole, the first weld is at a distance d from the edge of the second hole, and 0.2 mm ≤ d ≤ 1.5 mm.

2. The battery according to claim 1, characterized in that (cb) / 2≥0.2mm.

3. The battery according to claim 1, characterized in that The diameter b of the first hole gradually increases from inside to outside along the axial direction.

4. The battery according to claim 1, characterized in that The protruding portion (12) and the current collecting plate body (11) are an integrally formed structure.

5. The battery according to claim 4, characterized in that The protruding portion (12) comprises a circumferential side wall (121) and an end cover (122), and a cavity enclosed by the circumferential side wall (121) and the end cover (122); The current collecting plate body (11) is provided with a second through hole, and the circumferential outer wall is connected to the current collecting plate body (11) at the edge of the second through hole.

6. The battery according to claim 1, characterized in that The protruding portion (12) and the current collecting plate body (11) are connected by welding, and the protruding portion (12) is a solid structural member.

7. The battery according to claim 1, characterized in that The protruding height of the protruding portion (12) is h1, the height of the pole (2) is h2, and h1>h2.

8. The battery according to claim 7, characterized in that 0mm<h1-h2≤1mm.

9. The battery according to claim 1, characterized in that The weld width of the first weld is w, 0.2 mm ≤ w ≤ 2.0 mm; And / or, the penetration depth of the first weld is h3, 0.2mm≤h3≤2.0mm.

10. The battery according to claim 9, characterized in that The second hole has a depth in the axial direction The degree is h4, 0.1mm≤h4≤1mm; And / or, the axial depth of the second hole is h4 and the penetration depth h3 satisfies: 0.5 mm ≤ h3 / h4 ≤ 6 mm; and / or, the penetration depth and the distance d between the first weld and the edge of the second hole satisfy: w≤2d; And / or, the weld depth and the weld width satisfy: 0.5≤h3 / w≤3.

11. The battery according to claim 1, characterized in that It also comprises a sealing member (3), wherein the sealing member (3) is sleeved on the outside of the pole (2) and at least partially abuts against the outer surface of the pole (2).

12. The battery according to claim 11, characterized in that The pole (2) comprises, from inside to outside along the axial direction, a first pole region (22), a second pole region (23) and a third pole region (24), the outer diameter of the first pole region (22) being d, the outer diameter of the second pole region (23) being e, the outer diameter of the third pole region (24) being f, d>e, f>e, e>c; The sealing member (3) comprises a first portion (31), a second portion (32) and a third portion (33) in order from the inside to the outside along the axial direction, the inner diameters of the first portion (31), the second portion (32) and the third portion (33) are all g, g is matched with e, and the outer wall of the second column area (23) is in contact with the inner walls of the first portion (31), the second portion (32) and the third portion (33); The shell (4) abuts against an outer wall of the second part (32).

13. The battery according to claim 12, characterized in that The sealing element (3) further comprises a fourth portion (34) connected to the free end of the third portion (33), and the inner diameter of the fourth portion (34) is i; i and f are adapted, and the outer wall of the third column area (24) abuts against the inner wall of the fourth part (34).

14. The battery according to claim 12, characterized in that It also comprises a gasket (5), wherein the gasket (5) is sleeved on the outside of the pole (2) and is arranged axially between the pole (2) and the sealing element (3); The thickness of the gasket (5) is h4, the height of the first part (31) is h5, the height of the second part (32) is h6, the height of the third part (33) is h7, the height of the second column area (23) is h8, and h4+h5+h6+h7=h8.

15. The battery according to claim 1, characterized in that The sum of the area of ​​the outer end surface of the collector plate body (11) and the area of ​​the outer wall surface of the protrusion (12) is S1, the sum of the area of ​​the inner wall surface of the pole (2) and the inner end surface of the pole (2) is S2, and the effective contact area between the pole (2) and the collector plate (1) is S3, S3=S1∩S2, S1≥nC / K; S2≥nC / K; S3≥nC / K; S1=I1 / K; S2=I2 / K; Wherein, Kt is the temperature coefficient of resistance, the unit is ppm / ℃, and the measurement environment temperature is 25℃; S is the area through which the current flows, in mm 2 ; △T is the temperature rise, the unit is ℃; ρ is the resistivity, the unit is Ω*cm, and the measurement environment temperature is 25℃; K is the current carrying capacity per unit area of ​​metal, unit is A / mm 2 ; C is the cell capacity, in Ah; I1 is the current of the pole (2), in A; I2 is the current of the collecting disc (1), in A; n is a constant.

16. The battery according to claim 1, characterized in that In the radial direction, the connection between the protrusion (12) and the collecting plate body (11) is a first chamfer (13) at the cross section of the outer wall surface of the protrusion (12), and the radius thereof is r1; Along the radial direction, the cross section at the intersection of the inner end surface of the pole (2) and the first through hole (21) is a second chamfer (25), the radius of which is r2, where r2≥r1.

17. The battery according to any one of claims 1 to 16, characterized in that The batteries include cylindrical batteries and square batteries.

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