Battery

Abstract

The utility model discloses a battery which comprises a shell, a battery cell, a pole and a collector plate, and a first cavity is formed in the shell; the battery cell is mounted in the first cavity; the pole is arranged on the shell, and a first through hole is formed in the pole in a penetrating mode in the first direction; the current collecting plate is arranged between the battery cell and the pole, the current collecting plate comprises a plate body, a protruding column body and a protruding part, the protruding column body protrudes out of the surface, in the first direction, of the plate body, the protruding column body comprises a first surface far away from the plate body, the protruding part is arranged on the first surface, and at least part of the protruding column body penetrates through the first through hole and is welded to the pole. The problem that the welding quality between the pole and the collector plate is difficult to control is solved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a battery. Background Art

[0002] The battery includes components such as a shell, a pole, a collector plate, and a cell. The collector plate is one of the important components of a full-ear battery. The collector plate is used to lead the electric energy of the cell to the positive or negative terminal of the battery. After the cell is loaded into the shell and its pole ear is welded to the collector plate, the pole and the collector plate are penetrated and welded. The so-called penetration welding is mainly a method of welding the pole and the collector plate together by welding through the pole. During penetration welding, the welding condition between the pole and the collector plate cannot be observed, and it is easy for the welding to be loose or even produce poor welding, which makes it difficult to control the welding quality between the pole and the collector plate. It also makes the assembly process between the pole and the collector plate complicated and difficult, and the defective rate of the finished battery is high. Utility Model Content

[0003] The main purpose of the present application is to provide a battery to at least solve the problem in the background art that the welding quality between the pole and the current collecting plate is difficult to control.

[0004] According to one aspect of the present application, a battery is provided, comprising:

[0005] A housing having a first cavity disposed therein;

[0006] A battery cell, wherein the battery cell is installed in the first cavity;

[0007] A pole, the pole is arranged on the shell, and a first through hole is penetrated in the pole along a first direction;

[0008] A current collecting disk, wherein the current collecting disk is arranged between the battery cell and the pole, the current collecting disk comprises a disk body, a protruding column and a protruding portion, the protruding column protrudes from the surface of the disk body along a first direction, the protruding column comprises a first surface away from the disk body, the protruding portion is arranged on the first surface, and the protruding column is at least partially penetrated into the first through hole and welded to the pole.

[0009] Furthermore, the protruding column also includes a second surface, the second surface is the outer peripheral surface of the protruding body, the first surface includes a planar area between the protruding portion and the second surface, and there is a circular chamfer or a right angle between the planar area and the second surface, wherein the radius of the circular chamfer is not greater than 0.5 mm.

[0010] Further, the cross-section of the protrusion is circular, and the diameter of the protrusion gradually decreases or remains unchanged in the direction away from the first surface; and / or, there is an interface between the protrusion and the first surface, and the shape of the interface includes a circular ring.

[0011] Furthermore, the protrusion includes a first wall surface, the first wall surface is an outer peripheral surface of the protrusion, and an angle between a normal line of the planar area and the first wall surface is not less than 25° and not more than 75°.

[0012] Furthermore, the pole comprises a first end surface, the first end surface is located at an end of the pole away from the disk body, and the plane area is arranged flush with the first end surface.

[0013] Further, the first through hole includes a first hole segment and a second hole segment, the second hole segment is located on a side of the first hole segment away from the disk body, the diameter of the first hole segment is d1, the diameter of the second hole segment is d2, d2 is greater than d1, wherein the first end face is the bottom surface of the second hole segment close to the first hole segment, and the value of (d2-d1) / 2 is not less than 0.4 mm.

[0014] Further, along the first direction, the distance between the vertex of the protrusion away from the first surface and the disk body is h, the cross section of the protruding column is circular, and the diameter of the protruding column is greater than 0.5h and less than d1.

[0015] Furthermore, the cross-section of the protruding cylinder is circular, the protruding cylinder and the raised portion are coaxially arranged, the diameter of the protruding cylinder is a, the maximum value of the diameter of the raised portion is e, the value of (ae) / 2 is not less than 0.4 mm, and the value of (ae) / 2 is greater than the radius of the circular chamfer.

[0016] Further, along the first direction, the distance between the first surface and the disk body is h1, the distance between the vertex of the protrusion away from the first surface and the first surface is h2, and h2 is not greater than 0.3 times of h1.

[0017] Further, along the first direction, the distance between the vertex of the protrusion away from the first surface and the disk body is h, and the first through hole has a hole depth along the first direction, and the hole depth is not less than h.

[0018] Furthermore, a second cavity is provided in the protruding column, and the second cavity is communicated with the first cavity.

[0019] Furthermore, along the radial direction of the first through hole, the weld width of the weld between the protruding column and the pole is not less than 0.2 mm and not more than 2.0 mm; and / or, along the axial direction of the first through hole, the weld depth of the weld between the protruding column and the pole is not less than 0.2 mm.

[0020] Further, the pole includes a main body, a first outer flange and a second outer flange, the main body is arranged on the shell, the first outer flange is arranged at one end of the main body located inside the shell and abuts against the surface of the disk body, the second outer flange is arranged at one end of the main body located outside the shell and a groove is formed between the first outer flange, and the battery also includes:

[0021] A flexible insulating member, wherein the flexible insulating member is embedded in the groove and covers the portion of the housing located in the groove;

[0022] An insulating pad, the insulating pad is disposed between the side of the disk body away from the battery core and the shell, and at least a portion of the insulating pad along the radial direction of the first through hole is located between the first outer flange and the shell;

[0023] A sealing ring is arranged between the flexible insulating member and the insulating pad.

[0024] Furthermore, it also includes:

[0025] Reinforcing ribs are arranged on the insulating pad, and the reinforcing ribs include at least one first reinforcing rib, at least one second reinforcing rib and a plurality of third reinforcing ribs, the first reinforcing ribs and the second reinforcing ribs are both annular structures, at least one first reinforcing rib is arranged on a side of the insulating pad close to the disk body, at least one second reinforcing rib is arranged around the outer circumference of at least one first reinforcing rib, and a plurality of third reinforcing ribs are arranged between the first reinforcing rib and the second reinforcing rib along the circumferential direction of the first reinforcing rib.

[0026] Furthermore, the number of the third reinforcing ribs is not less than 3 and not more than 10; and / or, the first reinforcing rib and the second reinforcing rib have a first width along the radial direction of the first through hole, and the third reinforcing rib has a second width along the circumferential direction of the first reinforcing rib, and the first width and the second width are both not less than 0.4 mm and not more than 3 mm.

[0027] The battery provided in the present application is provided with a first through hole in the pole, and a protruding column is provided on the disc body of the current collecting disc, and the protruding column is at least partially penetrated in the first through hole of the pole and welded to the pole. During welding, the protruding column can be welded to the inner wall surface of the first through hole, or to the end surface of the pole away from the disc body. Since the welding position is between the end of the protruding column away from the disc body and the pole, visual welding of the pole and the current collecting disc is realized, and the welding personnel can observe the welding condition between the pole and the current collecting disc, thereby avoiding the occurrence of undesirable phenomena such as loose welding or even cold welding, so as to ensure the welding firmness and reliability between the pole and the current collecting disc, and reduce the assembly difficulty between the pole and the current collecting disc.

[0028] Secondly, the present application also reduces the welding gap between the collector plate and the pole by providing a protrusion on the protruding body, thereby further improving the welding quality between the pole and the collector plate. Specifically, the present application provides a protrusion on the first surface of the protruding column, and the protrusion can ensure that the first surface of the protruding column and the outer peripheral surface of the protruding column are at a right angle or a circular chamfer with a small radius in the manufacturing process. When the first surface and the outer peripheral surface of the protruding column are at a right angle or a circular chamfer with a small radius, the welding gap between the protruding column and the pole will be greatly reduced, thereby reliably welding the pole and the collector plate together.

[0029] In addition, the raised portion on the protruding column can also improve the structural strength of the protruding column, reduce the probability of deformation of the protruding column during the battery production process, better ensure the welding quality, improve the battery yield rate, and increase the battery safety during use. Specifically, when the protruding portion is processed on the protruding column, the protruding column undergoes strong plastic deformation, causing the material of the protruding column to undergo cold work hardening. The cold work hardening phenomenon improves the yield strength and surface hardness of the material of the protruding column at the protruding portion, reduces the risk of deformation and scratches during the protruding column manufacturing process and transportation, improves the yield rate of the collector plate, and reduces the processing cost of the collector plate. The raised portion enhances the structural strength and bending resistance of the first surface of the protruding column. During the use of the battery, fatigue failure of the weld between the protruding column and the pole due to internal pressure fluctuations in the battery can be avoided, causing safety problems such as battery leakage and gas leakage. In addition, the raised portion provides a larger heat dissipation area for the collector plate, which is more conducive to heat exchange between the battery cell and the outside world, and reduces the risk of thermal runaway of the battery to a certain extent. During the charge and discharge process of the battery, the chemical reaction inside the battery cell generates thermal expansion. The design of the protrusion makes the collecting plate have a certain structural elasticity. The protrusion can accommodate the expansion changes of the battery cell, reduce the degree of deformation of the shell when it is deformed by force due to expansion, and improve the life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0031] Figure 1 A schematic diagram of the structure of the battery disclosed in this application;

[0032] Figure 2 for Figure 1 An exploded schematic diagram of the pole, collector plate, flexible insulating member and insulating pad in FIG.

[0033] Figure 3 It is a schematic diagram of the structure of the collecting plate;

[0034] Figure 4 is a schematic structural diagram of the second cavity of the current collecting plate;

[0035] Figure 5 is a cross-sectional view of the collecting plate;

[0036] Figure 6 for Figure 1 A magnified schematic diagram of part A;

[0037] Figure 7 This is a schematic diagram of the structure when reinforcing ribs are set on the insulating pad.

[0038] The above drawings include the following reference numerals:

[0039] 10. Shell; 11. First cavity; 12. Opening; 20. Battery cell; 30. Pole; 301. First through hole; 011. First hole section; 012. Second hole section; 31. Main body; 32. First outer flange; 33. Second outer flange; 34. First end face; 40. Collector disk; 41. Disk body; 42. Protruding column; 421. First surface; 211. Planar area; 422. Second surface; 423. Second cavity; 43. Protrusion; 431. First wall; 432. Interface; 44. Circular chamfer; 45. Welding position; 50. Flexible insulating member; 60. Insulating pad; 61. First reinforcing rib; 62. Second reinforcing rib; 63. Third reinforcing rib; 70. Sealing ring. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In order to solve the problem that the welding quality between the pole 30 and the current collecting plate 40 is difficult to control, the embodiment of the utility model provides a battery, see Figures 1 to 3 The battery comprises a housing 10, a battery cell 20, a pole 30 and a current collecting plate 40. The housing 10 is provided with a first cavity 11, and the battery cell 20 is installed in the first cavity 11. The pole 30 is provided on the housing 10, and a first through hole 301 (such as Figure 2 As shown). The current collecting disk 40 is arranged between the battery cell 20 and the pole 30, and the current collecting disk 40 is used to be electrically connected to the pole lug of the battery cell 20. The current collecting disk 40 includes a disk body 41, a protruding column 42 and a protrusion 43. The protruding column 42 protrudes from the surface of the disk body 41 along the first direction, and the protruding body and the disk body 41 can be integrally formed. The outer contour shape of the disk body 41 includes one of a circle, a polygon, a runway shape (that is, a rectangular shape with arcs on both sides), etc. The specific situation of the disk body 41 depends on the specific overall structure of the battery, and this embodiment does not make a sole limitation here. The protruding column 42 includes a first surface 421 away from the disk body 41, as shown in FIG. Figure 3 As shown, the protrusion 43 is disposed on the first surface 421 , and the protruding column 42 is at least partially disposed in the first through hole 301 and welded to the pole 30 .

[0044] It can be seen that the pole 30 of the battery provided in this embodiment is provided with a first through hole 301, and the disc body 41 of the current collecting disc 40 is provided with a protruding column 42, and the protruding column 42 is at least partially penetrated in the first through hole 301 of the pole 30 and welded to the pole 30. During welding, the protruding column 42 can be welded to the inner wall surface of the first through hole 301, and can also be welded to the end surface of the pole 30 away from the disc body 41. Since the welding position 45 is between the end of the protruding column 42 away from the disc body 41 and the pole 30, visual welding of the pole 30 and the current collecting disc 40 is achieved, and the welding personnel can observe the welding condition between the pole 30 and the current collecting disc 40, thereby avoiding the occurrence of undesirable phenomena such as loose welding or even cold welding, so as to ensure the welding firmness and reliability between the pole 30 and the current collecting disc 40, and reduce the assembly difficulty between the pole 30 and the current collecting disc 40.

[0045] Secondly, the present embodiment further improves the welding quality between the pole 30 and the current collecting disc 40 by reducing the welding gap between the current collecting disc 40 and the pole 30 through the protrusion 43 provided on the protruding body. Specifically, the present embodiment is provided with the protrusion 43 on the first surface 421 of the protruding column 42, and the protrusion 43 can ensure that the first surface 421 of the protruding column 42 and the outer peripheral surface of the protruding column 42 are at a right angle or at an arc chamfer 44 with a small radius in the manufacturing process. When the first surface 421 and the outer peripheral surface of the protruding column 42 are at a right angle or at an arc chamfer 44 with a small radius, the welding gap between the protruding column 42 and the pole 30 will be greatly reduced, so that the pole 30 and the current collecting disc 40 can be reliably welded together.

[0046] In addition, the protrusion 43 on the protruding column 42 can also improve the structural strength of the protruding column 42, reduce the probability of deformation of the protruding column 42 during the battery production process, better ensure the welding quality, improve the battery yield rate, and increase the battery safety during use. Specifically, when the protrusion 43 is processed on the protruding column 42, the protruding column 42 produces strong plastic deformation, causing the material of the protruding column 42 to produce cold work hardening. The cold work hardening phenomenon improves the yield strength and surface hardness of the material of the protruding column 42 at the protruding portion 43, reduces the risk of deformation and scratches during the process and transportation of the protruding column 42, improves the yield rate of the collector 40, and reduces the processing cost of the collector 40. The protrusion 43 enhances the structural strength and bending resistance of the first surface 421 of the protruding column 42. During the use of the battery, fatigue failure of the weld between the protruding column 42 and the pole 30 caused by the internal air pressure fluctuation of the battery can be avoided, causing safety problems such as battery leakage and gas leakage. In addition, the protrusion 43 provides a larger heat dissipation area for the collector plate 40, which is more conducive to heat exchange between the battery cell 20 and the outside world, and reduces the risk of thermal runaway of the battery to a certain extent. During the battery charging and discharging process, the battery cell 20 generates thermal expansion due to chemical reactions. The design of the protrusion 43 makes the collector plate 40 have a certain structural elasticity. The protrusion 43 can accommodate the expansion changes of the battery cell 20, reduce the deformation degree of the shell 10 when it is deformed by force due to expansion, and improve the life of the battery.

[0047] like Figure 3As shown, the protruding column 42 in this embodiment also includes a second surface 422, and the second surface 422 is the outer peripheral surface of the protruding body. The first surface 421 includes a plane area 211 located between the protruding portion 43 and the second surface 422. Therefore, when the protruding body has a plane area 211 in this embodiment, the protruding column 42 and the pole 30 are angle-welded on the step surface formed by the plane area 211 and the inner wall surface of the first through hole 301, or the protruding body and the pole 30 are flat-welded between the plane area 211 and the end surface of the pole 30 away from the disk body 41. Whether it is angle welding or flat welding, the welding method is visual. Compared with the traditional method of welding the pole 30 through the pole 30 to weld the pole 30 and the collector 40 together, it can avoid the generation of a virtual weld between the pole 30 and the collector 40, and can better ensure the firmness of the welding. Specifically, there is a circular chamfer 44 or a right angle between the plane area 211 and the second surface 422, wherein the radius of the circular chamfer 44 is not greater than 0.5 mm. Since the protrusion 43 ensures that the first surface 421 of the protruding column 42 and the outer peripheral surface of the protruding column 42 are at a right angle or a circular chamfer 44 with a smaller radius, when the circular chamfer 44 is formed between the plane area 211 and the second surface 422, the radius of the circular chamfer 44 is not greater than 0.5 mm, so that the weld between the plane area 211 of the protruding column 42 and the pole 30 is smaller, thereby improving the welding quality between the protruding column 42 and the pole 30. In this embodiment, when the plane area 211 of the protruding column 42 and the second surface 422 are at a right angle, the welding gap between the pole 30 and the plane area 211 of the protruding column 42 is minimized, thereby further improving the welding quality between the protruding column 42 and the pole 30. The radius of the circular chamfer 44 may specifically include one of 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm, 0.1 mm, 0 mm, etc.

[0048] In some embodiments of the present invention, the cross section of the protrusion 43 is circular (the cross section is the cross section of the protrusion 43 along the radial direction of the first through hole 301). The protrusion 43 with a circular structure is easier to process and can ensure the consistency of the structural strength of each part of the protrusion 43. The diameter of the protrusion 43 gradually decreases or remains unchanged in the direction away from the first surface 421, so that the structural strength of the protruding column 42 at the first surface 421 is improved by the protrusion 43 of this structure, the probability of deformation of the protruding column 42 during the battery production process is reduced, the welding quality is better guaranteed, the battery yield rate is improved, and the battery safety during use is increased. There is an interface 432 between the protrusion 43 and the first surface 421, and the shape of the interface 432 includes a circular ring. When the cross section of the protrusion 43 is circular, the circular ring-shaped interface 432 is easy to process. When the protrusion 43 is punched out, a circular ring-shaped interface 432 is formed between the protrusion 43 and the first surface 421 of the protruding column 42.

[0049] like Figure 3 and Figure 5 As shown, the protrusion 43 includes a first wall surface 431, and the first wall surface 431 is the outer peripheral surface of the protrusion 43, and the normal line of the plane area 211 (the normal line is Figure 5 The angle between the dashed line indicated by the letter f in the figure and the first wall 431 (the angle is Figure 5 The angle shown in θ is not less than 25° and not more than 75°. The protrusion 43 in this angle range can not only improve the structural strength of the protruding column 42, but also enable the protrusion 43 to provide a larger heat dissipation area for the current collector, which is helpful for the heat exchange between the battery cell 20 and the outside world, and reduces the risk of thermal runaway of the battery. The angle between the normal of the plane area 211 and the first wall 431 may specifically include 25°, 26°, 28°, 29°, 30°, 32°, 34°, 35°, 37°, 38°, 40°, 41°, 43°, 45°, 48°, 50°, 52°, 54°, 56°, 58°, 59°, 60°, 62°, 63°, 65°, 67°, 69°, 70°, 72°, 73°, 74°, 75° and the like.

[0050] See also Figure 5 , along the first direction, the distance between the vertex of the protrusion 43 away from the first surface 421 and the disk body 41 is h, and the first through hole 301 has a hole depth along the first direction, and the hole depth is not less than h (that is, the hole depth is greater than or equal to h). Therefore, after the protrusion column and the pole 30 are welded, the protrusion column and the protrusion 43 will not be higher than the upper end surface of the pole 30 away from the disk body 41 along the first direction, so as to avoid the protrusion column 42 and the protrusion 43 from interfering with the connection between the battery and the bus when the battery is connected in series or in parallel through the bus.

[0051] like Figure 2 and Figure 6 As shown, the pole 30 in this embodiment includes a first end face 34, and the first end face 34 is located at one end of the pole 30 away from the disk body 41, and the plane area 211 is arranged flush with the first end face 34. When the plane area 211 is arranged flush with the first end face 34, when laser welding is used to perform flat welding on the plane area 211 and the first end face 34 of the protruding column 42, it is not only more conducive to controlling the laser focal length, but also less difficult to weld, thereby ensuring the welding quality between the protruding column 42 and the pole 30.

[0052] Specifically, see Figure 6In this embodiment, the first through hole 301 includes a first hole section 011 and a second hole section 012. The second hole section 012 is located on the side of the first hole section 011 away from the disk body 41. The diameter of the first hole section 011 is d1, and the diameter of the second hole section 012 is d2, and d2 is greater than d1. Among them, the first end surface 34 is the bottom surface of the second hole section 012 close to the first hole section 011. In the case that the first end surface 34 and the plane area 211 are arranged flush and the welding gap between the two along the radial direction of the second hole section 012 is small, the bottom surface of the second hole section 012 is welded together with the plane area 211 of the protruding column 42, which can better ensure the welding quality between the collector 40 and the pole 30. Moreover, the value of (d2-d1) / 2 is not less than 0.4 mm, that is, the radial dimension of the first end face 34 along the second hole section 012 is not less than 0.4 mm, thereby reducing the difficulty of welding between the plane area 211 of the protruding column 42 and the first end face 34 of the pole 30, and the welding position 45 formed after welding is firm and reliable, avoiding the generation of a cold weld between the protruding column 42 and the pole 30. The value of (d2-d1) / 2 may specifically include one of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, etc. Since the value of (d2-d1) / 2 may be determined according to the size of the pole 30 and the protruding column 42 actually used, the value of (d2-d1) / 2 in this embodiment is not limited to the above-listed sizes.

[0053] To ensure the welding quality between the protruding column 42 and the pole 30, the weld width (i.e. Figure 6 The width indicated by the symbol W at the welding position 45 is not less than 0.2 mm and not more than 2.0 mm to avoid a virtual weld between the protruding column 42 and the pole 30. The fusion width of the weld between the protruding column 42 and the pole 30 may specifically include 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, etc. Along the axial direction of the first through hole 301, the fusion depth (i.e. Figure 6 The depth indicated by the symbol V at the welding position 45 is not less than 0.2 mm, thereby improving the welding quality between the protruding column 42 and the pole 30. The penetration depth of the weld between the protruding column 42 and the pole 30 may specifically include one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0054] like Figure 5 As shown, along the first direction, the distance between the vertex of the protrusion 43 away from the first surface 421 and the disk body 41 is h, the cross section of the protruding column 42 is circular, and the diameter of the protruding column 42 (in this embodiment, the diameter of the protruding column 42 is the outer diameter of the protruding column 42) is greater than 0.5h and less than d1. In this embodiment, by making the diameter of the protruding column 42 greater than 0.5h, it is ensured that the protruding column 42 has a strong structural strength. This is because when the protruding column 42 is stamped out on the disk body 41, the protruding column 42 is obtained by stretching and deforming the disk body 41. In order to avoid the protruding column 42 from being too high in the first direction and affecting the strength of the protruding column 42, in this embodiment, by reducing the height of the protruding column 42 protruding from the disk body 41 in the first direction and making the diameter of the protruding column 42 greater than 0.5h, the protruding column 42 can be visually welded with the pole 30, and the structural strength of the protruding column 42 can be improved. The diameter of the protruding column 42 is smaller than d1 in order to ensure that the protruding column 42 can be inserted into the first through hole 301 of the pole 30 and be welded together with the pole 30 after being nested with the pole 30, so as to realize visual welding.

[0055] When the cross section of the protruding column 42 is circular, the protruding column 42 and the protruding portion 43 are coaxially arranged, thereby ensuring that the protruding portion 43 can improve the structural strength of the protruding column 42, and the first surface 421 of the protruding column 42 has a plane area 211 along the circumference of the protruding column 42, and the plane area 211 and the pole 30 are welded along the circumference of the protruding column 42, so as to further improve the welding strength and reliability between the protruding column 42 and the pole 30. In this embodiment, the diameter of the protruding column 42 is a, and the maximum value of the diameter of the protruding portion 43 is e, wherein when the diameter of the protruding portion 43 gradually decreases in the direction away from the first surface 421, the maximum value of the diameter of the protruding portion 43 is located on the side of the protruding portion 43 close to the first surface 421, and when the diameter of the protruding portion 43 remains unchanged in the direction away from the first surface 421, e is the diameter of the protruding portion 43. Among them, the value of (ae) / 2 is not less than 0.4mm, and the value of (ae) / 2 is greater than the radius of the arc chamfer 44, so that there is a plane area 211 between the first surface 421 and the protrusion 43, and the weld between the plane area 211 and the pole 30 is small. When the plane area 211 is welded to the pole 30, not only the welding difficulty can be reduced, but also the weld width at the formed welding position 45 is not less than 0.2mm, ensuring the welding quality between the protruding column 42 and the pole 30. The value of (ae) / 2 can specifically include one of 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, etc. The value of (ae) / 2 can specifically include one of 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc.

[0056] like Figure 5 As shown, along the first direction, the distance between the first surface 421 and the disk body 41 is h1 (i.e., the distance between the first surface 421 and the surface of the disk body 41 on the side close to the pole 30 is h1), and the distance between the vertex of the protrusion 43 away from the first surface 421 and the first surface 421 is h2, and h2 is not greater than 0.3 times of h1 (i.e., h2≤0.3h1). Therefore, the portion of the protrusion 43 protruding from the first surface 421 along the direction away from the first surface 421 will not be too high, which not only reduces the difficulty of processing the protrusion 43, but also improves the overall structural strength of the protrusion 43 and the protruding column 42. When the side of the protrusion 43 away from the first surface 421 is a plane, the distance between the vertex of the protrusion 43 away from the first surface 421 and the first surface 421 is the distance from the plane of the protrusion 43 away from the first surface 421 to the first surface 421.

[0057] like Figure 4 and Figure 5 As shown, a second cavity 423 is provided in the protruding column 42, and the second cavity 423 is connected to the first cavity 11. The second cavity 423 is formed by the side wall where the second surface 422 (i.e., the outer peripheral surface) of the protruding column 42 is located, and the top wall where the first surface 421 and the protruding portion 43 are located. When the protruding column 42 and the protruding portion 43 are punched out, the second cavity 423 can be obtained, and the processing is simple, efficient and convenient. When the battery is injected with electrolyte (at this time, the battery cell 20 is immersed in the electrolyte), the second cavity 423 in the protruding column 42 can accommodate more electrolyte, thereby improving the energy density of the battery. Moreover, the existence of the second cavity 423 can also reduce the weight of the collecting plate 40, thereby reducing the weight of the entire battery.

[0058] See also Figure 2 The pole 30 in this embodiment includes a main body 31, a first outer flange 32 and a second outer flange 33. The main body 31 is disposed on the housing 10. The first outer flange 32 is disposed at one end of the main body 31 located inside the housing 10 and abuts against the surface of the disk body 41 away from the battery cell 20. The second outer flange 33 is disposed at one end of the main body 31 located outside the housing 10 and a groove is formed between the first outer flange 32. The pole 30 in this embodiment can be an integrated riveted structure. In this case, the main body 31, the first outer flange 32 and the second outer flange 33 are an integrated structure. The pole 30 can also be a welded structure. In this case, one of the first outer flange 32 and the second outer flange 33 is welded to the main body 31. If the pole 30 is a riveted structure, a process fillet is provided between the inner wall surface of the second hole section 012 of the pole 30 and the upper surface of the pole 30 away from the disk body 41.

[0059] The battery provided in this embodiment further includes a flexible insulating member 50, an insulating pad 60 and a sealing ring 70. The flexible insulating member 50 is embedded in the groove and covers the portion of the shell 10 located in the groove to insulate and isolate the shell 10 from the pole 30. Specifically, the shell 10 is provided with an opening 12 connected to the first cavity 11 on one side along the first direction, and the opening 12 is the shell 10 itself or the top cover of the shell 10. The main body 31 of the pole 30 is installed at the opening 12, and the first outer flange 32 is located outside the shell 10, and the second outer flange 33 is located in the first cavity 11 and abuts against the upper surface of the disk body 41 near the opening 12 or the pole 30. The flexible insulating member 50 is embedded in the groove formed between the first outer flange 32 and the second outer flange 33, and the portion of the shell 10 at the opening 12 extends into the groove and the shell 10 itself or the top cover is isolated from the pole 30 by the flexible insulating member 50. The flexible insulating member 50 is made of a material with insulation and certain elasticity. The flexible insulating member 50 may include one of polybutylene terephthalate insulating member (the chemical abbreviation of polybutylene terephthalate is PBT), tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer insulating member (the chemical abbreviation of insulating member is PFA), polyphenylene sulfide insulating member (the chemical abbreviation of polyphenylene sulfide is PPS), etc.

[0060] The insulating gasket 60 is disposed between the side of the disk body 41 away from the battery cell 20 and the shell 10 to insulate the disk body 41 and the shell 10. In addition, the insulating gasket 60 is located between the first outer flange 32 and the shell 10 at least partially along the radial direction of the first through hole 301, so that the portion of the first outer flange 32 that is not covered and insulated by the flexible insulating member 50 is isolated from the shell 10 by the insulating gasket 60. The sealing ring 70 is disposed between the flexible insulating member 50 and the insulating gasket 60 to further improve the sealing performance of the battery and prevent electrolyte leakage. Specifically, along the axial direction of the first through hole 301, the sealing ring 70 is located between the shell 10 and the first outer flange 32 of the pole 30, and along the radial direction of the first through hole 301, the sealing ring 70 is disposed between the insulating gasket 60 and the flexible insulating member 50 to prevent electrolyte leakage caused by failure of the flexible insulating member 50.

[0061] See also Figure 7The battery provided in this embodiment also includes reinforcing ribs, which are arranged on the insulating pad 60. The reinforcing ribs include at least one first reinforcing rib 61, at least one second reinforcing rib 62 and a plurality of third reinforcing ribs 63. The first reinforcing rib 61 and the second reinforcing rib 62 are both annular structures (specifically, they can be circular ring structures or polygonal ring structures). At least one first reinforcing rib 61 is arranged on the side of the insulating pad 60 close to the disc body 41, and at least one second reinforcing rib 62 is arranged around the outer periphery of at least one first reinforcing rib 61. A plurality of third reinforcing ribs 63 are arranged between the first reinforcing rib 61 and the second reinforcing rib 62 at intervals along the circumference of the first reinforcing rib 61 to improve the structural strength of the insulating pad 60. Among them, the number of the third reinforcing ribs 63 is not less than 3 and not more than 10. When the plurality of third reinforcing ribs 63 are arranged at intervals, they are evenly arranged along the circumference of the first reinforcing rib 61. If the number of the third reinforcing ribs 63 is less than 3, it cannot be ensured that the insulating pad 60 has sufficient structural strength, which affects the insulation effect. Therefore, in this embodiment, the number of the third reinforcing ribs 63 is at least 3, thereby improving the structural strength of the insulating pad 60 and the insulating effect of the insulating pad 60 on the collector plate 40 and the pole 30. The number of the third reinforcing ribs 63 may specifically include one of 3, 4, 5, 6, 7, 8, 9, 10, etc. The first reinforcing rib 61 and the second reinforcing rib 62 have a first width along the radial direction of the first through hole 301, and the third reinforcing rib 63 has a second width along the circumferential direction of the first reinforcing rib 61. Both the first width and the second width are not less than 0.4 mm and not more than 3 mm, so that the structural strength of the insulating pad 60 is ensured by the first reinforcing rib 61, the second reinforcing rib 62 and the third reinforcing rib 63 within this width range. The sizes of the first width and the second width may specifically include 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.3mm, 2.5mm, 2.7mm, 2.9mm, 3mm, etc.

[0062] As can be seen from the above, in order to improve the welding quality between the current collecting disc 40 and the pole 30 and realize visual welding of the current collecting disc 40 and the pole 30, in this embodiment, a protruding column 42 is provided on the current collecting disc 40 of the sheet structure, so that the protruding column 42 is inserted into the first through hole 301 provided on the pole 30 to be welded with the pole 30. Among them, the protruding column 42 and the disc body 41 of the current collecting disc 40 are integrally formed, and in order to ensure that the upper surface (i.e., the first surface 421) of the protruding column 42 and its second surface 422 are at a right angle or have a circular arc chamfer 44 with a smaller diameter, a protruding portion 43 is provided on the first surface 421 of the protruding column 42 (the protruding portion 43 is a protruding block occupying a part of the area of ​​the first surface 421). The protruding column 42 of the current collecting plate 40 is nested with the first through hole 301 of the pole 30, that is, the protruding column 42 is at least partially nested in the first through hole 301, and welding is performed in the nesting area between the protruding column 42 and the pole 30 (such as between the first surface 421 of the protruding column 42 and the inner wall surface of the first through hole 301, and between the first surface 421 and the first end surface 34 of the pole 30), so that the welding position 45 is placed outside the battery structure, and visual welding can be achieved, thereby ensuring the welding quality between the pole 30 and the current collecting plate 40. The circumferential side wall where the second surface 422 of the protruding column 42 is located and the top where the first surface 421 is located enclose a second cavity 423 that can accommodate more electrolyte. The raised portion 43 on the first surface 421 can reduce the process fillet of the protruding column 42 of the current collecting plate 40 and the pole 30, so that the welding effect of the pole 30 and the current collecting plate 40 is good, a good sealing effect is achieved, and the yield rate of the battery product is improved.

[0063] The protrusion 43 on the first surface 421 can also improve the structural strength of the protruding column 42 of the current collecting plate 40, reduce the probability of deformation of the protruding column 42 during battery production, better ensure the welding effect of the current collecting plate 40 after welding with the pole 30 through the protruding column 42, and improve the battery yield and safety during battery use. The current collecting plate 40 in this embodiment can be specifically applied to at least one of cylindrical batteries, square batteries, blade batteries, etc.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A housing (10), wherein a first cavity (11) is provided in the housing (10); A battery core (20), the battery core (20) being installed in the first cavity (11); A pole (30), the pole (30) being arranged on the housing (10), and a first through hole (301) penetrating the pole (30) along a first direction; A current collecting disk (40), the current collecting disk (40) being arranged between the battery cell (20) and the pole (30), the current collecting disk (40) comprising a disk body (41), a protruding column (42) and a protruding portion (43), the protruding column (42) protruding from a surface of the disk body (41) along a first direction, the protruding column (42) comprising a first surface (421) away from the disk body (41), the protruding portion (43) being arranged on the first surface (421), and the protruding column (42) at least partially passing through the first through hole (301) and being welded to the pole (30).

2. The battery according to claim 1, characterized in that The protruding column (42) also includes a second surface (422), the second surface (422) is the outer peripheral surface of the protruding column, the first surface (421) includes a plane area (211) located between the protruding portion (43) and the second surface (422), and there is a circular chamfer (44) or a right angle between the plane area (211) and the second surface (422), wherein the radius of the circular chamfer (44) is not greater than 0.5 mm.

3. The battery according to claim 2, characterized in that The cross section of the protrusion (43) is circular, and the diameter of the protrusion (43) gradually decreases or remains unchanged in the direction away from the first surface (421); and / or, there is an interface (432) between the protrusion (43) and the first surface (421), and the shape of the interface (432) includes a circular ring.

4. The battery according to claim 2, characterized in that The raised portion (43) comprises a first wall surface (431), the first wall surface (431) being the outer peripheral surface of the raised portion (43), and an angle between a normal line of the plane region (211) and the first wall surface (431) being not less than 25° and not greater than 75°.

5. The battery according to claim 3, characterized in that The pole (30) comprises a first end surface (34), the first end surface (34) is located at an end of the pole (30) away from the disk body (41), and the plane area (211) is arranged flush with the first end surface (34).

6. The battery according to claim 5, characterized in that The first through hole (301) comprises a first hole segment (011) and a second hole segment (012), wherein the second hole segment (012) is located on a side of the first hole segment (011) away from the disk body (41), the diameter of the first hole segment (011) is d1, the diameter of the second hole segment (012) is d2, d2 is greater than d1, wherein the first end surface (34) is the bottom surface of the second hole segment (012) close to the first hole segment (011), and the value of (d2-d1) / 2 is not less than 0.4 mm.

7. The battery according to claim 6, characterized in that Along the first direction, the distance between the vertex of the protrusion (43) away from the first surface (421) and the disk body (41) is h, the cross-section of the protruding column (42) is circular, and the diameter of the protruding column (42) is greater than 0.5h and less than d1.

8. The battery according to claim 3, characterized in that The cross section of the protruding column (42) is circular, the protruding column (42) and the raised portion (43) are coaxially arranged, the diameter of the protruding column (42) is a, the maximum value of the diameter of the raised portion (43) is e, the value of (ae) / 2 is not less than 0.4 mm, and the value of (ae) / 2 is greater than the radius of the circular chamfer (44).

9. The battery according to claim 1, characterized in that Along the first direction, the distance between the first surface (421) and the disk body (41) is h1, and the distance between the vertex of the protrusion (43) away from the first surface (421) and the first surface (421) is h2, and h2 is not greater than 0.3 times of h1.

10. The battery according to any one of claims 1 to 9, characterized in that: Along the first direction, the distance between the vertex of the protrusion (43) away from the first surface (421) and the disk body (41) is h, and the first through hole (301) has a hole depth along the first direction, and the hole depth is not less than h.

11. The battery according to any one of claims 1 to 9, characterized in that: A second cavity (423) is provided in the protruding column (42), and the second cavity (423) is communicated with the first cavity (11).

12. The battery according to any one of claims 1 to 9, characterized in that: Along the radial direction of the first through hole (301), the weld width of the weld between the protruding column (42) and the pole (30) is not less than 0.2 mm and not more than 2.0 mm; and / or, along the axial direction of the first through hole (301), the weld depth of the weld between the protruding column (42) and the pole (30) is not less than 0.2 mm.

13. The battery according to any one of claims 1 to 9, characterized in that: The pole (30) comprises a main body (31), a first outer flange (32) and a second outer flange (33); the main body (31) is arranged through the shell (10); the first outer flange (32) is arranged at one end of the main body (31) located inside the shell (10) and abuts against the surface of the disk body (41); the second outer flange (33) is arranged at one end of the main body (31) located outside the shell (10) and a groove is formed between the first outer flange (32); the battery further comprises: a flexible insulating member (50), the flexible insulating member (50) being embedded in the groove and covering the portion of the housing (10) located in the groove; an insulating pad (60), the insulating pad (60) being arranged between a side of the disk body (41) away from the battery core (20) and the shell (10), and at least a portion of the insulating pad (60) along the radial direction of the first through hole (301) being located between the first outer flange (32) and the shell (10); A sealing ring (70), wherein the sealing ring (70) is arranged between the flexible insulating member (50) and the insulating pad (60).

14. The battery according to claim 13, characterized in that Also includes: The reinforcing ribs are arranged on the insulating pad (60), and the reinforcing ribs include at least one first reinforcing rib (61), at least one second reinforcing rib (62) and a plurality of third reinforcing ribs (63). The first reinforcing rib (61) and the second reinforcing rib (62) are both annular structures. At least one of the first reinforcing ribs (61) is arranged on a side of the insulating pad (60) close to the disk body (41), at least one of the second reinforcing ribs (62) is arranged around the outer circumference of at least one of the first reinforcing ribs (61), and a plurality of the third reinforcing ribs (63) are arranged between the first reinforcing rib (61) and the second reinforcing rib (62) at intervals along the circumference of the first reinforcing rib (61).

15. The battery according to claim 14, characterized in that The number of the third reinforcing ribs (63) is not less than 3 and not more than 10; and / or the first reinforcing rib (61) and the second reinforcing rib (62) have a first width along the radial direction of the first through hole (301), and the third reinforcing rib (63) has a second width along the circumferential direction of the first reinforcing rib (61), and the first width and the second width are both not less than 0.4 mm and not more than 3 mm.

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