End cover assembly, energy storage device and electric equipment

Abstract

According to the end cover assembly, the energy storage device and the electric equipment provided by the invention, the arching deformation of the adapter plate can be avoided, and the occurrence of cracks after the adapter plate is welded with the pole is prevented, so that the use reliability of the energy storage device is improved. The end cover assembly comprises a cover plate, a pole, a welding ring, a switching piece and a supporting protrusion, the cover plate comprises a first surface and a second surface, the first surface and the second surface are oppositely arranged in the thickness direction of the cover plate, the cover plate is provided with an assembly hole, and the assembly hole penetrates through the first surface and the second surface; the pole penetrates through the assembly hole, and the welding ring is located on the side, away from the second surface, of the first surface, sleeves the pole and is fixedly connected with the pole; the adapter plate is positioned on one side, deviating from the cover plate, of the welding ring and is fixedly connected with the pole; and the supporting bulge is positioned between the switching piece and the welding ring and is arranged around the pole.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an end cover assembly, an energy storage device and an electrical equipment. Background Art

[0002] A secondary battery (rechargeable battery), also known as a rechargeable battery or storage battery, refers to a battery that can be recharged to activate the active material and continue to be used after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people's requirements for the energy density and reliability of secondary batteries are also getting higher and higher. In existing secondary batteries, when the welding nozzle is used to press down the welding adapter and the pole, the adapter is prone to arching and deformation, resulting in cracks in the connecting piece after welding, which reduces the reliability of the secondary battery. Summary of the invention

[0003] The present application provides an end cover assembly, an energy storage device and an electrical device, which can prevent the adapter from arching and deforming, and prevent cracks from appearing on the adapter after welding with the pole, thereby helping to improve the reliability of the energy storage device.

[0004] In the first aspect, the present application provides an end cap assembly for use in an energy storage device. The end cap assembly includes a cover plate, a pole, a welding ring, a transfer plate, and a support protrusion. The cover plate includes a first surface and a second surface. The first surface and the second surface are arranged opposite to each other along the thickness direction of the cover plate. The cover plate is provided with an assembly hole, and the assembly hole passes through the first surface and the second surface. The pole is passed through the assembly hole. The welding ring is located on the side of the first surface away from the second surface, and is sleeved on the pole and fixedly connected to the pole. The transfer plate has a welding area and an abutment area. Along the thickness direction of the end cap assembly, the welding area is arranged corresponding to the pole, and the abutment area is arranged around the welding area. The transfer plate is located on the side of the welding ring away from the cover plate, and is fixedly connected to the pole. The support protrusion is located between the transfer plate and the welding ring, and is arranged around the pole. Along the thickness direction of the end cap assembly, at least part of the projection of the support protrusion on the transfer plate is located in the abutment area.

[0005] The supporting protrusion is connected to the surface of the adapter plate facing the welding ring, and abuts against the surface of the welding ring facing the adapter plate.

[0006] Wherein, the supporting protrusion is connected to the surface of the welding ring facing the adapter plate, and abuts against the surface of the adapter plate facing the welding ring.

[0007] Wherein, the supporting protrusion includes a plurality of sub-supporting portions, and the plurality of sub-supporting portions are arranged at intervals around the pole.

[0008] Wherein, each of the sub-support portions extends along the radial direction of the pole.

[0009] Wherein, the supporting protrusion is centrally symmetrical about the central axis of the pole.

[0010] Wherein, the supporting protrusion is an annular protrusion.

[0011] Wherein, the height h of the supporting protrusion is 0.1mm≤h≤0.3mm.

[0012] The adapter plate is provided with a groove, the opening of the groove is located on the surface of the adapter plate away from the welding ring, the groove is arranged around the pole, and along the thickness direction of the adapter plate, the groove is arranged opposite to the supporting protrusion.

[0013] Wherein, the pole includes a welding surface facing the adapter plate. When the pole and the adapter plate are fixed by welding using a welding nozzle, the welding nozzle is located on a side of the adapter plate away from the pole and covers the welding surface.

[0014] Wherein, along the thickness direction of the end cover assembly, the surface of the welding ring facing the adapter plate is located on the side of the welding surface facing away from the adapter plate.

[0015] In a second aspect, the present application also provides an energy storage device, comprising a shell, a battery cell and an end cover assembly as described above, wherein the shell has an opening and a receiving cavity, the opening is connected to the receiving cavity, the battery cell is received in the receiving cavity, the end cover assembly is installed on the shell and closes the opening, and the adapter is electrically connected to the battery cell.

[0016] In a third aspect, the present application further provides an electrical device, comprising the energy storage device as described above, wherein the energy storage device supplies power to the electrical device.

[0017] In the end cap assembly provided by the present application, by arranging a support protrusion between the adapter plate and the welding ring, when the adapter plate is welded to the pole, the support protrusion can provide support force for the adapter plate to prevent the adapter plate from being deformed when subjected to the pressure of the welding nozzle, thereby avoiding the cracking of the molten pool during the welding of the adapter plate, and preventing the adapter plate from cracking after cooling, thereby helping to improve the reliability of the energy storage device. At the same time, arranging the support protrusion on the adapter plate also helps to improve the flow effect of the end cap assembly, ensuring the safety and reliability of the energy storage device. In addition, the support protrusion is arranged around the pole, which can also play a pre-positioning role for the assembly between the adapter plate and the pole, ensuring a high degree of assembly accuracy between the pole and the adapter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0019] Figure 1 is a schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 The schematic diagram of the structure of the end cover assembly in the energy storage device shown in the first embodiment;

[0021] Figure 3 yes Figure 2 The cross-sectional structure diagram of the end cover assembly after being cut along AA;

[0022] Figure 4 yes Figure 2 A schematic diagram of the structure of the adapter plate and the supporting protrusion in the end cover assembly shown;

[0023] Figure 5 yes Figure 4 A schematic diagram of the structure of the adapter plate and the supporting protrusion at another angle;

[0024] Figure 6 yes Figure 3 A partial cross-sectional structural diagram of the end cover assembly and the welding nozzle is shown;

[0025] Figure 7 yes Figure 1 The schematic diagram of the structure of the end cover assembly in the energy storage device shown in the second embodiment;

[0026] Figure 8 yes Figure 7 The cross-sectional structure diagram of the end cover assembly after being cut along BB;

[0027] Fig. 9 yes Figure 7 A schematic diagram of the structure of the adapter plate and the supporting protrusion in the end cover assembly shown;

[0028] Fig.10 yes Fig. 9 A schematic diagram of the structure of the adapter plate and the supporting protrusion at another angle;

[0029] Fig.11 yes Figure 8 A partial cross-sectional structural diagram of the end cover assembly and the welding nozzle is shown;

[0030] Fig.12 yes Figure 1 A schematic diagram of the structure of the end cover assembly in the energy storage device in the third embodiment;

[0031] Fig.13 yes Fig.12 The structure diagram of the end cover assembly after being cut along CC is shown;

[0032] Fig.14 yes Fig.12 A schematic diagram of the structure of the welding ring and the supporting protrusion in the end cover assembly shown;

[0033] Fig.15 is along Fig.14 Schematic diagram of the cross-sectional structure after cutting at DD in the middle;

[0034] Fig.16 yes Fig.14 The structure diagram of the support protrusion and the welding ring in the fourth embodiment is shown.

[0035] The names corresponding to the reference numerals in the figures are:

[0036] Energy storage device 100, shell 110, end cover assembly 120, lower plastic 10, cover plate 20, explosion-proof valve 30, pole unit 40, adapter 50, explosion-proof fence 101, through hole 102, first surface 21, second surface 22, explosion-proof hole 201, assembly hole 202, upper plastic 41, pole 42, seal 43, welding ring 44, flange portion 421, fixing portion 422, welding surface 422a, first surface 50a, second surface 50b, first part 501, second part 502, groove 51, support protrusion 60, sub-support portion 61, sub-groove 511, matching hole 441, welding nozzle 200, welding area 50c, abutment area 50d. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0038] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of the energy storage device 100 provided in an embodiment of the present application. For the convenience of description, the length direction of the energy storage device 100 is defined as the X-axis direction, the width direction of the energy storage device 100 is defined as the Y-axis direction, and the height direction of the energy storage device 100 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0039] The energy storage device 100 includes a shell 110, a battery cell (not shown) and an end cap assembly 120. The shell 110 has an opening (not shown) and a receiving cavity (not shown), and the opening is connected to the receiving cavity. The battery cell is received in the receiving cavity. The receiving cavity is also used to receive an electrolyte, and the battery cell is immersed in the electrolyte. The end cap assembly 120 is installed on the top side of the shell 110 in the height direction of the energy storage device 100 (Z-axis direction shown in the figure) and closes the opening. Exemplarily, the energy storage device 100 is a square battery. In some other embodiments, the energy storage device 100 may also be a cylindrical battery or other batteries.

[0040] It should be noted that the directional terms such as "top" and "bottom" involved in this application are referenced to the attached Figure 1 The description of the orientation shown uses the positive direction of the Z-axis as the "top" and the negative direction of the Z-axis as the "bottom". Similar descriptions below may be understood in the same way, but they do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0041] See also Figure 2 and Figure 3 , Figure 2 yes Figure 1 The schematic diagram of the structure of the end cover assembly 120 in the energy storage device 100 in the first embodiment is shown. Figure 3 yes Figure 2 The cross-sectional structure diagram of the end cap assembly 120 is shown after being cut along AA. Wherein, "cut along AA" means cutting along the plane where the AA line is located, and similar descriptions in the following text can be understood in the same way.

[0042] The end cap assembly 120 includes a lower plastic 10, a cover plate 20, an explosion-proof valve 30, two pole units 40, two adapters 50 and two support protrusions 60. The lower plastic 10 is installed on one side of the cover plate 20 in the thickness direction. The explosion-proof valve 30 and the two pole units 40 are installed on the cover plate 20. Among them, along the length direction of the energy storage device 100, the two pole units 40 are respectively located on opposite sides of the explosion-proof valve 30. The two adapters 50 are installed on the side of the lower plastic 10 away from the cover plate 20. Each adapter 50 is electrically connected to a pole unit 40 and the battery cell of the energy storage device 100. Each support protrusion 60 is located between an adapter 50 and a pole unit 40.

[0043] Specifically, the lower plastic 10 includes an explosion-proof fence 101, and the explosion-proof fence 101 penetrates the top surface (not shown) and the bottom surface (not shown) of the lower plastic 10. Among them, the explosion-proof fence 101 is located in the middle of the lower plastic 10. The lower plastic 10 is also provided with a through hole 102, and the through holes 102 penetrate the lower plastic 10 along the thickness direction of the lower plastic 10 (Z-axis direction shown in the figure), and are spaced apart from the explosion-proof fence 101. In this embodiment, there are two through holes 102. Along the length direction of the lower plastic 10 (X-axis direction shown in the figure), the two through holes 102 are respectively located on opposite sides of the explosion-proof fence 101.

[0044] Please continue reading Figure 3 . The cover plate 20 includes a first surface 21 and a second surface 22. Along the thickness direction of the cover plate 20, the first surface 21 and the second surface 22 are arranged opposite to each other. Among them, the first surface 21 is the side of the cover plate 20 facing the lower plastic 10, and the second surface 22 is the side of the cover body away from the lower plastic 10. The cover plate 20 is also provided with an explosion-proof hole 201 and an assembly hole 202. The explosion-proof hole 201 and the assembly hole 202 both penetrate the first surface 21 and the second surface 22 of the cover plate 20, and are arranged at intervals from each other. Specifically, the explosion-proof hole 201 is located in the middle of the cover plate 20. Among them, the explosion-proof hole 201 can be connected to the interior of the energy storage device 100 through the explosion-proof fence 101.

[0045] Along the length direction of the cover plate 20 (the X-axis direction in the figure), the assembly hole 202 is located at the edge of the cover plate 20. In this embodiment, there are two assembly holes 202. Along the length direction of the cover plate 20 (the X-axis direction in the figure), the two assembly holes 202 are respectively located on opposite sides of the explosion-proof hole 201. Each assembly hole 202 is connected to a through hole 102 of the lower plastic 10 to facilitate the subsequent installation of the pole unit 40.

[0046] The explosion-proof valve 30 is installed in the explosion-proof hole 201 and fixedly connected to the hole wall of the explosion-proof hole 201. Exemplarily, the explosion-proof valve 30 can be fixedly connected to the hole wall of the explosion-proof hole 201 by welding to be installed in the explosion-proof hole 201. It can be understood that since the explosion-proof hole 201 connects the inside and outside of the energy storage device 100, when the air pressure inside the energy storage device 100 is too high, the explosion-proof valve 30 will rupture under the action of the air pressure, and the gas inside the energy storage device 100 can be discharged to the outside of the energy storage device 100 in time through the explosion-proof fence 101 of the lower plastic 10 and the explosion-proof hole 201 in turn, so as to avoid the explosion of the energy storage device 100 and improve the reliability of the use of the energy storage device 100.

[0047] In this embodiment, the two pole units 40 may have the same or similar structures. One pole unit is a positive pole unit and is electrically connected to the positive pole tab of the battery cell. The other pole unit 40 is a negative pole unit and is electrically connected to the negative pole tab of the battery cell. The structure of one pole unit 40 will be described in detail below as an example.

[0048] Please continue to refer to 3. The pole unit 40 includes an upper plastic 41, a pole 42, a seal 43 and a welding ring 44. Among them, the pole 42 is inserted into the assembly hole 202 of the cover plate 20. Exemplarily, the pole 42 is made of aluminum metal material. In this embodiment, the pole 42 also includes a flange portion 421 and a fixing portion 422. The flange portion 421 is located on the side of the second surface 22 of the cover plate 20 away from the first surface 21. The fixing portion 422 is fixedly connected to the side of the flange portion 421 facing the second surface 22. Among them, the peripheral side surface of the flange portion 421 protrudes relative to the peripheral side surface of the fixing portion 422. Specifically, the fixing portion 422 is inserted into the assembly hole 202. In addition, the pole 42 also includes a welding surface 422a away from the cover plate 20. Specifically, the fixing portion 422 includes a welding surface 422a away from the cover plate 20. The welding surface 422a is used for subsequent laser welding with the adapter 50. It can also be understood that the pole 42 includes a welding surface 422 a facing the adapter plate 50 .

[0049] The upper plastic 41 is sleeved on the pole 42 and is located between the pole 42 and the cover plate 20. Part of the upper plastic 41 is located between the second surface 22 of the cover plate 20 and the flange portion 421 of the pole 42, and another part of the upper plastic 41 is located between the fixing portion 422 of the pole 42 and the hole wall of the assembly hole 202. Under this arrangement, the short circuit problem caused by the direct contact between the pole 42 and the cover plate 20 can be avoided, ensuring good reliability of the end cover assembly 120.

[0050] In this embodiment, the welding ring 44 is located on the side of the first surface 21 of the cover plate 20 away from the second surface 22, and is sleeved on the fixing portion 422 of the pole 42, and is fixedly connected to the fixing portion 422 of the pole 42. In the thickness direction of the end cover assembly 120 (Z-axis direction in the figure), the surface of the welding ring 44 away from the cover plate 20 is located on the side of the welding surface 422a of the pole 42 facing the first surface 21.

[0051] The seal 43 is sleeved on the upper plastic 41 and clamped between the welding ring 44 and the cover plate 20. It can be understood that the seal 43 can not only ensure the assembly stability between the welding ring 44 and the cover plate 20, but also prevent the welding ring 44 and the cover plate 20 from directly contacting and conducting electricity, thereby achieving insulation between the welding ring 44 and the cover plate 20.

[0052] Please refer to Figure 3 , Figure 4 and Figure 5 , Figure 4 yes Figure 2 The schematic diagram of the structure of the adapter plate 50 and the support protrusion 60 in the end cover assembly 120 is shown. Figure 5 yes Figure 4 The schematic diagram of the structure of the adapter plate 50 and the supporting protrusion 60 at another angle is shown.

[0053] Each adapter plate 50 is located on the side of the welding ring 44 away from the cover plate 20, and is welded and fixed to the fixing portion 422 of the pole 42. At this time, along the thickness direction of the end cover assembly 120, the surface of the welding ring 44 facing the adapter plate 50 is located on the side of the welding surface 422a of the pole 42 away from the adapter plate 50. Under this setting, it is possible to prevent the surface of the welding ring 44 facing the adapter plate 50 from being higher than the welding surface 422a of the pole 42, thereby preventing the welding ring 44 from affecting the welding between the adapter plate 50 and the pole 42, and ensuring that the welding of the adapter plate 50 and the pole 42 is completed smoothly.

[0054] In this embodiment, each adapter 50 has a welding area 50c and an abutment area 50d. In the thickness direction of the end cap assembly 120, the welding area 50c is arranged corresponding to the pole 42. The adapter 50 and the pole 42 are laser welded in the welding area 50c to fix the adapter 50 and the pole 42. The abutment area 50d is arranged around the circumference of the welding area 50c.

[0055] The adapter plate 50 includes a first surface 50a and a second surface 50b. Along the thickness direction of the adapter plate 50, the first surface 50a and the second surface 50b are arranged opposite to each other. Among them, the first surface 50a is the side of the adapter plate 50 facing the welding ring 44, and the first surface 50a and the surface of the welding ring 44 facing the adapter plate 50 are spaced apart. The second surface 50b is the side of the adapter plate 50 away from the welding ring 44. The adapter plate 50 also includes a first part 501 and two second parts 502. Among them, the first part 501 is used for welding with the fixing part 422 of the pole 42. The two second parts 502 are fixedly connected to the first part 501. Along the width direction of the adapter plate 50 (the Y-axis direction shown in the figure), the two second parts 502 are respectively located on opposite sides of the first part 501. The two second parts 502 are both used to connect to the tabs of the battery cell, so that the adapter 50 is electrically connected to the battery cell, and thus the pole unit 40 is electrically connected to the battery cell through the adapter 50 .

[0056] Please continue reading Figure 3 and Figure 5 The support protrusion 60 is located between the adapter plate 50 and the welding ring 44, and is arranged around the circumference of the pole 42. Along the thickness direction of the end cover assembly 120, at least part of the projection of the support protrusion 60 on the adapter plate 50 is located in the abutment area 50d of the adapter plate 50. In this embodiment, the support protrusion 60 is connected to the surface of the adapter plate 50 facing the welding ring 44, and abuts the surface of the welding ring 44 facing the adapter plate 50. Along the thickness direction of the end cover assembly 120, the projection of the support protrusion 60 on the adapter plate 50 is completely located in the abutment area 50d of the adapter plate 50.

[0057] Specifically, the support protrusion 60 is provided on the first surface 50a of the first part 501 of the adapter sheet 50, and is provided around the fixing portion 422 of the pole 42. In the present embodiment, the support protrusion 60 is an annular protrusion. The support protrusion 60 is symmetrical about the center axis of the fixing portion 422 of the pole 42. Among them, the height h of the support protrusion 60 is 0.1mm≤h≤0.3mm, so as to ensure that the support protrusion 60 can abut against the surface of the welding ring 44 facing the adapter sheet 50. Exemplarily, the height h of the support protrusion 60 is 0.2mm.

[0058] Please refer again Figures 3 to 5 , the adapter plate 50 is provided with a groove 51. Specifically, the first portion 501 of the adapter plate 50 is provided with a groove 51. The opening of the groove 51 is located on the second surface 50b of the first portion 501. The groove 51 is recessed from the second surface 50b to the first surface 50a, and is arranged around the fixing portion 422 of the pole 42. Along the thickness direction of the end cover assembly 120, the groove 51 is arranged opposite to the support protrusion 60.

[0059] In this embodiment, the adapter plate 50 can be punched from the second surface 50b to the first surface 50a to form a groove 51 on the second surface 50b, and a support protrusion 60 can be formed on the first surface 50a, that is, the support protrusion 60 and the groove 51 are formed simultaneously in one stamping process, thereby simplifying the manufacturing process of the adapter plate 50 and reducing the production cost of the adapter plate 50.

[0060] See also Figure 6 , Figure 6 yes Figure 3 The end cover assembly 120 and the welding nozzle 200 are partially cross-sectional schematic diagrams.

[0061] When the adapter 50 is laser welded to the pole 42, the welding nozzle 200 is required to press down the adapter 50 to prevent light leakage during the laser welding process. At this time, the welding nozzle 200 abuts against the abutment area 50d of the adapter 50. The welding nozzle 200 is located on the side of the adapter 50 away from the fixing portion 422 of the pole 42, and covers the welding surface 422a of the pole 42. That is, the diameter of the orthographic projection of the welding surface 422a of the fixing portion 422 on the second surface 50b of the adapter 50 is smaller than the inner diameter of the orthographic projection of the welding nozzle 200 on the second surface 50b of the adapter 50. Under this setting, the welding surface 422a of the pole 42 can be completely located on the inner side of the welding nozzle 200, ensuring that the welding reliability between the pole 42 and the adapter 50 is better.

[0062] In this embodiment, a support protrusion 60 is provided on the adapter plate 50, and the support protrusion 60 is abutted against the welding ring 44. When the welding nozzle 200 presses down the adapter plate 50, the support protrusion 60 is correspondingly provided with the welding nozzle 200, and the support protrusion 60 is abutted between the welding ring 44 and the adapter plate 50, thereby filling the gap between the surface of the welding ring 44 facing away from the cover plate 20 and the surface of the adapter plate 50 facing the welding ring 44, and can play a supporting role, thereby preventing the adapter plate 50 from arching and deforming under the action of the welding nozzle 200, thereby preventing the adapter plate 50 from cracking due to deformation during welding, and further helping to improve the reliability of the energy storage device 100. By making the support protrusion 60 symmetrical about the central axis of the pole 42, the force on the adapter 50 can be balanced, and the adapter 50 can be prevented from tilting, thereby preventing the adapter 50 from deforming when pressed by the welding nozzle 200, which can also help to improve the problem of cracks caused by deformation of the adapter 50 during welding, and improve the reliability of the energy storage device 100. On this basis, the support protrusion 60 set on the adapter 50 can also increase the flow effect of the adapter 50 and improve the safety of the energy storage device 100.

[0063] In this embodiment, when the adapter 50 is placed on the pole 42 and before being welded to the pole 42, the height h of the support protrusion 60 is greater than the distance d between the welding surface 422a of the fixing portion 422 of the pole 42 and the surface of the welding ring 44 away from the cover plate 20. Among them, the difference a of the distance d between the welding surface 422a and the surface of the welding ring 44 away from the cover plate 20 is 0.05mm≤a≤0.07mm. Under this setting, the support protrusion 60 can enable the adapter 50 to have a pre-positioning function. It can be understood that during the assembly of the adapter 50 and the pole 42, when the adapter 50 is moved left and right, the support protrusion 60 on the adapter 50 will be blocked by the pole 42, preventing the position where the adapter 50 and the pole 42 are welded to be displaced, thereby improving the welding reliability between the adapter 50 and the pole 42 and improving the assembly accuracy between the adapter 50 and the pole 42. At the same time, since the support protrusion 60 is formed by stamping the adapter plate 50, when the welding nozzle 200 presses down the adapter plate 50, due to the high air pressure of the welding nozzle 200, the support protrusion 60 will rebound and deform, so that the support protrusion 60 can be reliably held between the welding ring 44 and the adapter plate 50.

[0064] Please refer to Figure 7 , Figure 8 and Fig. 9 , Figure 7 yes Figure 1 The schematic diagram of the structure of the end cover assembly 120 in the energy storage device 100 in the second embodiment is shown. Figure 8 yes Figure 7 The cross-sectional structure diagram of the end cover assembly 120 after being cut along BB is shown. Fig. 9 yes Figure 7 A schematic structural diagram of the adapter plate 50 and the support protrusion 60 in the end cover assembly 120 is shown.

[0065] The end cap assembly 120 shown in this embodiment is different from the end cap assembly 120 shown in the first embodiment described above in that the support protrusion 60 includes a plurality of sub-support portions 61. The plurality of sub-support portions 61 are arranged at intervals around the pole 42. Specifically, the plurality of sub-support portions 61 are arranged at intervals around the fixing portion 422 of the pole 42. It is understandable that during the production process, it is easier for the stamping die to stamp out a plurality of spaced-apart sub-support portions 61 on the adapter sheet 50, while also being able to reduce the degree of damage to the stamping die, thereby helping to extend the service life of the stamping die.

[0066] Each sub-support portion 61 extends in the radial direction of the fixing portion 422 of the pole 42. In the thickness direction of the end cap assembly 120, a portion of the projection of each sub-support portion 61 on the adapter plate 50 is located within the abutment area 50d of the adapter plate 50. Under this arrangement, each sub-support portion 61 has a certain length, which can increase the contact area between the support protrusion 60 and the surface of the welding ring 44 facing the adapter plate 50, so that the support protrusion 60 of the adapter plate 50 and the welding ring 44 can be reliably abutted.

[0067] Please refer to Figure 8 and Fig.10 , Fig.10 yes Fig. 9 The schematic diagram of the structure of the adapter plate 50 and the supporting protrusion 60 at another angle is shown.

[0068] In the present embodiment, the groove 51 of the adapter plate 50 includes a plurality of sub-grooves 511. The openings of the plurality of sub-grooves 511 are all located on the second surface 50b of the first portion 501, and the plurality of sub-grooves 511 are all recessed in the second direction from the second surface 50b to the first surface 50a. The plurality of sub-grooves 511 are spaced apart from each other. Along the thickness direction of the adapter plate 50, each sub-groove 511 is disposed opposite to a sub-support portion 61. In the present embodiment, a sub-support portion 61 can be formed by stamping the adapter plate 50 from the second surface 50b to the first surface 50a, and a sub-groove 511 can be formed on the second surface 50b, that is, each sub-support portion 61 and each sub-groove 511 are formed simultaneously in a single stamping process, thereby simplifying the manufacturing process of the adapter plate 50 and reducing the production cost of the adapter plate 50.

[0069] See also Fig.11 , Fig.11 yes Figure 8 The end cover assembly 120 and the welding nozzle 200 are partially cross-sectional schematic diagrams.

[0070] In this embodiment, when the welding nozzle 200 is used to press down the adapter sheet 50 so that the adapter sheet 50 and the pole 42 are laser welded, the multiple sub-support portions 61 are all in contact with the welding ring 44. At this time, the multiple sub-support portions 61 are all arranged corresponding to the welding nozzle 200, and the support protrusion 60 is held between the welding ring 44 and the adapter sheet 50, which can play a supporting role, and prevent the adapter sheet 50 from being arched and deformed under the action of the welding nozzle 200, thereby preventing the adapter sheet 50 from cracking due to deformation during welding, thereby helping to improve the reliability of the energy storage device 100. At the same time, by making each sub-support portion 61 extend in the radial direction of the fixing portion 422 of the pole 42, the adapter sheet 50 can be adapted to the welding nozzles 200 with different inner diameters, and can still maintain force balance in different welding scenarios, thereby preventing the adapter sheet 50 from cracking during welding due to tilt deformation, thereby helping to improve the reliability of the energy storage device 100.

[0071] In this embodiment, by setting the support protrusion 60 on the surface of the adapter sheet 50 facing the welding ring 44, the support protrusion 60 can abut against the welding ring 44. When the welding nozzle 200 presses down the adapter sheet 50, the support protrusion 60 is set corresponding to the welding nozzle 200, and the support protrusion 60 abuts between the welding ring 44 and the adapter sheet 50, which can play a supporting role, and prevent the adapter sheet 50 from being deformed when it is subjected to the pressure of the welding nozzle 200, thereby avoiding the cracking of the molten pool when the adapter sheet 50 is welded, and preventing the adapter sheet 50 from cracking after cooling, thereby helping to improve the reliability of the energy storage device 100. At the same time, setting the support protrusion 60 on the adapter sheet 50 also helps to improve the flow effect of the end cover assembly 120, and ensures that the safety and reliability of the energy storage device 100 are good.

[0072] On this basis, by making the support protrusion 60 include a plurality of spaced-apart sub-support portions 61, and making the plurality of spaced-apart sub-support portions 61 symmetrical about the central axis of the pole 42, it is possible to ensure that the adapter plate 50 is subjected to balanced forces, avoid tilting of the adapter plate 50, and further ensure that the adapter plate 50 will not be deformed when subjected to the pressure of the welding nozzle 200, thereby preventing the adapter plate 50 from cracking due to deformation during welding, thereby helping to improve the reliability of the energy storage device 100.

[0073] Please refer to Figures 12 to 15 , Fig.12 yes Figure 1 The schematic diagram of the structure of the end cover assembly 120 in the energy storage device 100 in the third embodiment is shown. Fig.13 yes Fig.12 The structure diagram of the end cover assembly 120 after being cut along CC is shown. Fig.14 yes Fig.12 The schematic diagram of the structure of the welding ring 44 and the supporting protrusion 60 in the end cover assembly 120 is shown. Fig.15 is along Fig.14 Schematic diagram of the cross-sectional structure after cutting at DD in the middle.

[0074] The end cap assembly 120 shown in this embodiment is different from the end cap assembly 120 shown in the first embodiment described above in that the support protrusion 60 is connected to the surface of the welding ring 44 facing the adapter plate 50, and abuts against the surface of the adapter plate 50 facing the welding ring 44. In this embodiment, the height h of the support protrusion 60 is 0.15mm≤h≤0.3mm. Under this setting, it is ensured that the support protrusion 60 can abut against the surface of the adapter plate 50 facing the welding ring 44, and it is also possible to avoid the support protrusion 60 from affecting the welding between the adapter plate 50 and the pole 42, thereby ensuring that the adapter plate 50 and the pole 42 are welded smoothly.

[0075] Specifically, the welding ring 44 is provided with a matching hole 441. The matching hole 441 penetrates the welding ring 44 along the thickness direction of the welding ring 44. The matching hole 441 is used to install the pole 42. Among them, the support protrusion 60 is arranged around the circumference of the matching hole 441. When the pole 42 and the welding ring 44 are assembled, the support protrusion 60 is arranged around the circumference of the pole 42. When the adapter 50 is welded to the pole 42, the adapter 50 is located on the side of the welding ring 44 away from the cover plate 20. At this time, the support protrusion 60 abuts against the surface of the adapter 50 facing the welding ring 44.

[0076] In this embodiment, by providing a support protrusion 60 on the surface of the welding ring 44 facing the adapter sheet 50, and making the support protrusion 60 abut against the adapter sheet 50, when the welding nozzle 200 presses down the adapter sheet 50, the welding nozzle 200 is arranged corresponding to the support protrusion 60. The support protrusion 60 abuts between the welding ring 44 and the adapter sheet 50, and can play a supporting role, so as to prevent the adapter sheet 50 from being deformed by the welding nozzle 200, thereby preventing the adapter sheet 50 from cracking due to deformation during welding, and thus helping to improve the reliability of the energy storage device 100. At the same time, by making the support protrusion 60 symmetrical about the central axis of the pole 42, the adapter sheet 50 can be balanced in force, and the adapter sheet 50 can be prevented from tilting, thereby preventing the adapter sheet 50 from being deformed when being pressed down by the welding nozzle 200, and thus helping to improve the problem of cracking due to deformation of the adapter sheet 50 during welding, and improving the reliability of the energy storage device 100.

[0077] See also Fig.16 , Fig.16 yes Fig.14 The structure diagram of the support protrusion 60 and the welding ring 44 in the fourth embodiment is shown.

[0078] The end cap assembly 120 shown in this embodiment is different from the end cap assembly 120 shown in the third embodiment described above in that the support protrusion 60 includes a plurality of sub-support portions 61. The plurality of sub-support portions 61 are arranged at intervals around the pole 42. Specifically, the plurality of sub-support portions 61 are arranged at intervals around the fixing portion 422 of the pole 42. Each sub-support portion 61 extends in the radial direction of the fixing portion 422 of the pole 42. Under this arrangement, each sub-support portion 61 has a certain length, which can increase the contact area between the support protrusion 60 and the surface of the adapter plate 50 facing the welding ring 44, so that the adapter plate 50 and the support protrusion 60 can be reliably abutted.

[0079] The present application also provides an electric device, which includes the energy storage device 100, and the energy storage device 100 supplies power to the electric device. The electric device may be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

[0080] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An end cap assembly for use in an energy storage device, characterized in that: The end cap assembly comprises a cover plate, a pole, a welding ring, a transfer sheet and a supporting protrusion, the cover plate comprises a first surface and a second surface, the first surface and the second surface are arranged opposite to each other along the thickness direction of the cover plate, the cover plate is provided with an assembly hole, and the assembly hole passes through the first surface and the second surface; The pole is passed through the assembly hole, the welding ring is located on the side of the first surface away from the second surface, and is sleeved on the pole and fixedly connected to the pole; The adapter is located on a side of the welding ring away from the cover plate and is fixedly connected to the pole. The adapter has a welding area and an abutment area. Along the thickness direction of the end cover assembly, the welding area is arranged corresponding to the pole, and the abutment area is arranged around the welding area. The support protrusion is located between the adapter plate and the welding ring and is arranged around the pole. Along the thickness direction of the end cover assembly, at least part of the projection of the support protrusion on the adapter plate is located in the abutment area.

2. The end cap assembly according to claim 1, characterized in that: The supporting protrusion is connected to the surface of the adapter plate facing the welding ring, and abuts against the surface of the welding ring facing the adapter plate.

3. The end cap assembly according to claim 1, characterized in that: The supporting protrusion is connected to the surface of the welding ring facing the adapter plate, and abuts against the surface of the adapter plate facing the welding ring.

4. The end cap assembly according to any one of claims 1 to 3, characterized in that: The supporting protrusion includes a plurality of sub-supporting portions, and the plurality of sub-supporting portions are arranged at intervals around the pole.

5. The end cap assembly according to claim 4, characterized in that: Each of the sub-supporting portions extends along the radial direction of the pole.

6. The end cap assembly according to any one of claims 1 to 3, characterized in that: The supporting protrusion is centrally symmetrical about the central axis of the pole.

7. The end cap assembly according to any one of claims 1 to 3, characterized in that: The supporting protrusion is an annular protrusion.

8. The end cap assembly according to any one of claims 1 to 3, characterized in that: The height h of the supporting protrusion is 0.1mm≤h≤0.3mm.

9. The end cap assembly according to claim 2, characterized in that: The adapter plate is provided with a groove, the opening of the groove is located on the surface of the adapter plate away from the welding ring, the groove is arranged around the pole, and along the thickness direction of the adapter plate, the groove is arranged opposite to the supporting protrusion.

10. The end cap assembly according to claim 1, characterized in that: The pole comprises a welding surface facing the adapter. When the pole and the adapter are fixed by welding using a welding nozzle, the welding nozzle is located on a side of the adapter away from the pole and covers the welding surface.

11. The end cap assembly according to claim 10, characterized in that: Along the thickness direction of the end cover assembly, the surface of the welding ring facing the adapter plate is located on the side of the welding surface facing away from the adapter plate.

12. An energy storage device, characterized in that: It comprises a shell, a battery cell and an end cover assembly as described in any one of claims 1 to 11, the shell having an opening and a receiving cavity, the opening being connected to the receiving cavity, the battery cell being received in the receiving cavity, the end cover assembly being mounted on the shell and closing the opening, and the adapter being electrically connected to the battery cell.

13. An electrical equipment, characterized in that: It includes the energy storage device as described in claim 12, and the energy storage device supplies power to the electrical equipment.

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