Top cover assembly, energy storage device and electrical equipment

Abstract

The present invention discloses a top cover assembly, an energy storage device and an electrical equipment. The top cover assembly includes a top cover body, a voltage conducting block and a pole column. The voltage conducting block is arranged on one side of the body. The second end of the pole column penetrates through the first through hole of the voltage conducting block and is riveted to the voltage conducting block, and a first deformation part and a second deformation part are formed at the second end. The first deformation part is used to realize the connection between the pole column and the voltage conducting block and limit the axial movement of the pole column relative to the voltage conducting block along the axis of the pole column. The second deformation part is engaged with a third deformation part formed on the voltage conducting block to limit the rotation of the pole column relative to the voltage conducting block. Thereby, good anti-torsion performance is achieved between the pole column and the voltage conducting block, and the reliability of the top cover assembly during use is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a top cover assembly, an energy storage device, and an electrical equipment. Background Art

[0002] An energy storage device module is usually composed of multiple energy storage devices, and the multiple energy storage devices are electrically connected through a bus bar. Specifically, a top cover assembly of the energy storage device includes a pole column and a voltage conducting block. The voltage conducting block is sleeved on the outer periphery of the pole column. The voltage conducting block is used for welding with the bus bar, and the pole column is used for connecting with an electrode assembly, so as to realize the electrical connection between the multiple energy storage devices and the electrode assembly.

[0003] In order to ensure the welding strength between the pole column and the voltage conducting block, usually the materials of the pole column and the voltage conducting block are the same. For example, the negative electrodes are both copper. However, the bus bar of the energy storage device module usually uses aluminum to reduce costs and achieve light weight. Since the copper voltage conducting block and the aluminum bus bar have different materials, the welding strength is insufficient. During the transportation or use of the energy storage device module, the welded part is easily broken due to vibration or collision, resulting in the disconnection of the electrical connection of the energy storage device module and the failure of the energy storage device module. Summary of the Invention

[0004] Embodiments of the present invention disclose a top cover assembly, an energy storage device, and an electrical equipment, which can ensure the welding strength by realizing the welding of the voltage conducting block and the bus bar with the same material, and effectively prevent relative torsion between the pole column and the first pressing block, thereby improving the use reliability of the energy storage device.

[0005] To achieve the above object, in a first aspect, the present invention discloses a top cover assembly, which is applied to an energy storage device and includes:

[0006] A top cover body, in which a pole column through hole is provided;

[0007] A voltage conducting block, arranged on one side of the top cover body, the voltage conducting block is provided with a first through hole, and the first through hole corresponds to and communicates with the pole column through hole;

[0008] A pole, the pole having a first end and a second end opposite to each other, the first end being located on a side of the top cover body away from the conductive voltage block, the first end being used to connect to an electrode assembly of the energy storage device, the second end being passed through the pole through hole and the first through hole, the second end being riveted to the conductive voltage block to form a first deformation portion and a second deformation portion on the second end, the first deformation portion being formed at an end portion of the second end to limit the pole from moving relative to the conductive voltage block along the pole axis direction, the second deformation portion being located on a side of the first deformation portion facing the first end, the conductive voltage block forming a third deformation portion corresponding to the second deformation portion, the third deformation portion being configured to cooperate with the second deformation portion to limit the pole from rotating relative to the conductive voltage block.

[0009] By riveting the pole, firstly, the pole is riveted to form a first deformation part, so that the pole is clamped on the conductive voltage block to achieve the connection between the pole and the conductive voltage block, and prevent the pole from coming off the conductive voltage block. Secondly, the second deformation part is riveted on the pole and the third deformation part is formed on the conductive voltage block at the same time, and the second deformation part is clamped in the third deformation part to achieve the effect of preventing the pole from rotating relative to the conductive voltage block, so that the pole and the conductive voltage block have good anti-torsion performance, and the reliability of the top cover assembly during use is improved.

[0010] As an optional implementation, in an embodiment of the present invention, the first deformation portion and the second deformation portion are respectively formed by two punching and riveting operations.

[0011] Through two riveting operations, the riveting processes can be controlled separately to ensure that the first deformation portion and the second deformation portion formed have good morphology, while avoiding punch wear during mass production, which causes the second deformation portion to be too shallow and affects the anti-rotation effect.

[0012] As an optional implementation, in an embodiment of the present invention, the second end is subjected to a first punch riveting to form the second deformation portion, and the second end is subjected to a second punch riveting to form the first deformation portion.

[0013] The first deformation portion is formed after the second deformation portion is formed. During the process of forming the first deformation portion, the first deformation portion can better fill the gap between the pole and the first through hole of the conductive voltage block through deformation, further improve the sealing performance of the riveting between the pole and the conductive voltage block, and enhance the sealing effect of the top cover assembly.

[0014] As an optional implementation, in an embodiment of the present invention, the first deformation portion has an abutment surface toward the first end, the second deformation portion is protruding from the abutment surface, the first through hole has a first step surface, the abutment surface abuts against the first step surface, and the third deformation portion is formed on the first step surface.

[0015] Through the cooperation between the abutting surface and the first stepped surface, the stability of the connection between the pole column and the voltage-conducting block can be improved, and the pole column can be prevented from being removed from the first through hole. By forming the second deformed portion on the abutting surface and the third deformed portion on the first stepped surface, the structure after the connection between the pole column and the voltage-conducting block can be made more compact, and at the same time, the effect of preventing relative rotation between the pole column and the voltage-conducting block is achieved.

[0016] As an alternative embodiment, in the embodiment of the present invention, the first through hole is a stepped hole. Along the through direction of the first through hole, the first through hole includes a first hole section and a second hole section connected in sequence. The first hole section is close to the top cover body, the inner diameter of the second hole section is larger than that of the first hole section, the first stepped surface is formed at the connection between the first hole section and the second hole section, and the third deformed portion is formed on the first hole section.

[0017] By setting the first through hole as a stepped hole and making the inner diameter of the second hole section larger than that of the first hole section, in this way, the second hole section can provide sufficient accommodation space for the first deformed portion, and the first deformed portion can be clamped in the second hole section, so as to realize the connection between the pole column and the voltage-conducting block and prevent the pole column from being removed from the voltage-conducting block.

[0018] As an alternative embodiment, in the embodiment of the present invention, one of the second deformed portion and the third deformed portion is a protrusion, and the other is a groove.

[0019] By using the mutual cooperation between the protrusion and the groove, the mutual engagement between the second deformed portion and the third deformed portion can be realized, so as to limit the circumferential rotation of the pole column relative to the voltage-conducting block along the circumference of the voltage-conducting block.

[0020] As an alternative embodiment, in the embodiment of the present invention, there are a plurality of second deformed portions, and the plurality of second deformed portions are spaced and evenly distributed along the center of the pole column.

[0021] By forming a plurality of second deformed portions, a second deformed portion with a larger area can be set in the limited space of the first deformed portion, further improving the anti-torsion performance of the pole column. And the even distribution can evenly disperse the riveting pressure around the pole column, improving the sealing performance.

[0022] As an alternative embodiment, in the embodiment of the present invention, there are 2 second deformed portions, and the 2 second deformed portions are symmetrically arranged relative to the center of the pole column.

[0023] The two second deformation parts symmetrically arranged along the center of the pole column can be completed by one-time punching and riveting with a punching and riveting die, improving the efficiency of punching and riveting. Among them, the punching and riveting pattern of the punching and riveting die is symmetrically arranged along the center of the pole column, so that the number of punching and riveting times can be reduced on the premise of forming a sufficient number of second deformation parts.

[0024] As an alternative implementation manner, in the embodiment of the present invention, the voltage-conducting block includes a first pressing block and a second pressing block. The second pressing block is sleeved on the outer periphery of the first pressing block. The first pressing block is provided with the first through hole. The pole column passes through the first pressing block and is riveted to the first pressing block. The third deformation part abuts against the first pressing block.

[0025] Both the pole column and the first pressing block are made of copper, and the second pressing block is an aluminum pressing block.

[0026] The voltage-conducting block is set as the first pressing block and the second pressing block, and the first pressing block is a copper pressing block and the second pressing block is an aluminum pressing block. In this way, by using the conversion function of the second pressing block, on the premise of avoiding direct welding of two different metal materials of the pole column and the bus bar, better electrical connection between the bus bar and the first pressing block is realized, and then electrical connection between the bus bar and the pole column is realized.

[0027] As an alternative implementation manner, in the embodiment of the present invention, the second pressing block is provided with a second through hole. The second through hole corresponds to and communicates with the pole column through hole. The second through hole is a stepped hole, including a third hole section and a fourth hole section connected in sequence. The third hole section is close to the top cover body. The inner diameter of the fourth hole section is larger than that of the third hole section. The first pressing block is arranged in the fourth hole section.

[0028] By setting the second through hole as a stepped hole, on the one hand, the first pressing block can be clamped in the second pressing block, and by using the clamping of the first riveting part of the pole column and the first pressing block, the second pressing block is connected to the top cover body to prevent the second pressing block from coming off the top cover body. On the other hand, the stepped hole can increase the connection area between the first pressing block and the second pressing block, thereby improving the reliability of the physical connection and electrical connection between the two.

[0029] As an alternative implementation manner, in the embodiment of the present invention, the first pressing block has a first surface away from the top cover body, the second pressing block has a second surface away from the top cover body, the first deformation part has a third surface, and the first surface, the second surface and the third surface face the same direction. The first surface is flush with the third surface.

[0030] Along the axial direction of the pole column, the second surface at least protrudes from the first surface and / or the third surface, and the protruding height h of the second surface ≥ 0.5 mm.

[0031] By setting a certain height difference between the second surface and the first surface (and the third surface), when the second surface is welded to the bus bar, a certain gap can be generated between the first surface (and the third surface) and the bus bar, so as to avoid the bus bar and prevent interference between the pole column or the first pressing block and the bus bar.

[0032] As an optional implementation manner, in the embodiment of the present invention, a chamfer is provided at one end of the second through hole facing the top cover.

[0033] During the process of inserting the second end of the pole column into the second through hole, the chamfer can provide guidance for the pole column to avoid collision between the pole column and the outer periphery of the second through hole, thereby improving the assembly yield and efficiency.

[0034] As an optional implementation manner, in the embodiment of the present invention, the first pressing block is welded to the first deformed portion.

[0035] By welding the first deformed portion and the first pressing block, the connection strength between the pole column and the first pressing block can be strengthened, thereby improving the anti-torsion performance between the pole column and the first pressing block. Welding connection can slow down the creep generated after riveting and improve the reliability of the electrical connection between the pole column and the first pressing block.

[0036] As an optional implementation manner, in the embodiment of the present invention, along the radial direction of the second pressing block, the weld formed by welding the first pressing block and the first deformed portion has a distance d from the second pressing block, and d≥0.5mm.

[0037] By designing a certain distance between the weld and the second pressing block, contact or interference between the weld and the second pressing block can be avoided. Since the material of the second pressing block is different from that of the first pressing block, when welding the first deformed portion and the first pressing block, avoiding contact with the second pressing block can reduce the generation of welding defects, thereby improving the welding effect.

[0038] As an optional implementation manner, in the embodiment of the present invention, the pole column includes a column body and a connecting portion. The column body is disposed through the pole column through hole and the first through hole, and the column body includes the first end and the second end. The connecting portion is connected to the first end of the column body, and the outer periphery of the connecting portion protrudes from the outer periphery of the column body to be connected to the top cover body and located on the other side of the top cover body. The connecting portion is used to connect to the electrode assembly of the energy storage device.

[0039] By providing the connecting portion, on the one hand, the connection area between the pole column and the electrode assembly can be increased, and the reliability of the electrical connection between the pole column and the electrode assembly can be improved. On the other hand, the pole column can be clamped to the top cover body to prevent the pole column from disengaging from the top cover body.

[0040] In a second aspect, the present invention also discloses an energy storage device, which includes a housing, an electrode assembly, and a top cover assembly as described in the first aspect above. The housing has an opening, the electrode assembly is disposed in the housing and electrically connected to the pole post of the top cover assembly, and the top cover body is disposed on the housing to cover the opening.

[0041] In a third aspect, the present invention also discloses an electrical equipment having the energy storage device as described in the second aspect above, and the energy storage device supplies power to the electrical equipment.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] A top cover assembly provided in an embodiment of the present invention, by riveting the pole post, first, riveting the pole post to form a first deformation part, thereby clamping the pole post on the voltage-conducting block to realize the connection between the pole post and the voltage-conducting block and prevent the pole post from disengaging from the voltage-conducting block. Second, simultaneously riveting on the pole post to form a second deformation part and forming a third deformation part on the voltage-conducting block, and using the second deformation part to be clamped in the third deformation part to achieve the effect of preventing the pole post from rotating relative to the voltage-conducting block, so that there is good anti-torsion performance between the pole post and the voltage-conducting block, and the reliability of the top cover assembly during use is improved. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 is a schematic structural diagram of the top cover assembly provided in an embodiment of the present invention;

[0046] Figure 2 is an exploded schematic structural diagram of the top cover assembly provided in an embodiment of the present invention;

[0047] Figure 3 is an exploded schematic structural diagram of the pole post and the voltage-conducting block provided in an embodiment of the present invention;

[0048] Figure 4 is a schematic structural diagram of the pole post provided in an embodiment of the present invention;

[0049] Figure 5 is an assembled schematic diagram of the pole post and the voltage-conducting block provided in an embodiment of the present invention;

[0050] Figure 6 is a schematic structural diagram of the second pressure block provided in an embodiment of the present invention;

[0051] Figure 7 It is a schematic structural diagram of another perspective of the second pressing block provided by an embodiment of the present invention;

[0052] Figure 8 It is a schematic structural diagram of the energy storage device provided by an embodiment of the present invention;

[0053] Figure 9 It is a structural block diagram of the electrical equipment provided by an embodiment of the present invention.

[0054] Icons: 100, top cover assembly; 10, top cover body; 11, pole post through-hole; 20, voltage-conducting pressing block; 21, first through-hole; 210, first step surface; 211, first hole section; 212, second hole section; 22, third deformation part; 23, first pressing block; 230, first surface; 24, second pressing block; 240, second through-hole; 2401, third hole section; 2402, fourth hole section; 241, second surface; 242, chamfer; 30, pole post; 31, first end; 32, second end; 321, first deformation part; 3210, abutting surface; 3211, third surface; 322, second deformation part; 33, column body; 34, connecting part; 200, energy storage device; 201, housing; 2011, opening; 300, electrical equipment. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] In addition, the terms "installed", "set", "provided with", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and do not indicate or imply the relative importance and quantity of the indicated devices, components or parts. Unless otherwise stated, the meaning of "a plurality" is two or more.

[0058] The energy storage device module is usually composed of multiple energy storage devices, and the multiple energy storage devices are electrically connected through the busbar. Specifically, the top cover assembly of the energy storage device includes a pole and a conductive voltage block, the conductive voltage block is sleeved on the outer periphery of the pole, the conductive voltage block is used to be welded with the busbar, and the pole is used to connect with the electrode assembly, thereby realizing the electrical connection between the multiple energy storage devices and the electrode assembly.

[0059] However, during the use of the energy storage device module, due to the presence of a certain tangential force between the busbar and the energy storage device, a torsional force exists between the conductive voltage block and the pole along the circumferential direction of the conductive voltage block. This creates a risk of relative torsion between the pole and the conductive voltage block, which can easily lead to conductive failure of the battery and affect the reliability of the battery.

[0060] Based on this, the present invention provides a top cover assembly, which can effectively prevent relative torsion between the pole and the first pressing block, thereby improving the reliability of the energy storage device.

[0061] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0062] First, see Figures 1 to 3 The present application provides a top cover assembly 100, which can be applied to an energy storage device. The top cover assembly 100 includes a top cover body 10, a conductive voltage block 20 and a pole 30. The top cover body 10 is provided with a pole through hole 11, the conductive voltage block 20 is arranged on one side of the top cover body 10, and the conductive voltage block 20 is provided with a first through hole 21, which corresponds to and is connected to the pole through hole 11. The pole 30 has a first end 31 and a second end 32 opposite to each other. The first end 31 is located on a side of the top cover body 10 away from the conductive voltage block 20. The first end 31 is used to connect to the electrode assembly of the energy storage device. The second end 32 is inserted into the pole through hole 11 and the first through hole 21. The second end 32 is riveted to the conductive voltage block 20 to form a first deformation portion 321 and a second deformation portion 322 on the second end 32. The first deformation portion 321 is formed at the end of the second end 32 to limit the movement of the pole 30 relative to the conductive voltage block 20 along the axial direction of the pole 30. The second deformation portion 322 is located on a side of the first deformation portion 321 facing the first end 31. The conductive voltage block 20 forms a third deformation portion 22 corresponding to the second deformation portion 322. The third deformation portion 22 is configured to cooperate with the second deformation portion 322 to limit the rotation of the pole 30 relative to the conductive voltage block 20.

[0063] By riveting the terminal post 30, first, the terminal post 30 is riveted to form a first deformation portion 321, thereby clamping the terminal post 30 to the voltage-conducting block 20 to realize the connection between the terminal post 30 and the voltage-conducting block 20 and prevent the terminal post 30 from disengaging from the voltage-conducting block 20. Second, a second deformation portion 322 is formed by riveting on the terminal post 30 at the same time and a third deformation portion 22 is formed on the voltage-conducting block 20. The second deformation portion 322 is clamped in the third deformation portion 22 to prevent the terminal post 30 from rotating relative to the voltage-conducting block 20, so that the terminal post 30 and the voltage-conducting block 20 have good anti-torsion performance and improve the reliability of the top cover assembly 100 during use.

[0064] Exemplarily, the first deformation portion 321 and the second deformation portion 322 can be formed simultaneously by one-time riveting or can be formed successively by two-time riveting respectively. In some examples, a conical punch is used, and a linear protrusion is provided on the surface of the punch for contacting the terminal post 30. When the punch is used to rivet the terminal post 30, the punch can not only rivet the second end 32 of the terminal post 30 to form the first deformation portion 321, but also use the linear protrusion to simultaneously form the second deformation portion 322 on the terminal post 30. In this way, the first deformation portion 321 and the second deformation portion 322 can be formed simultaneously by only one-time riveting, avoiding multiple alignments and rivetings between the punch and the terminal post 30, which is beneficial to improving the accuracy and efficiency of riveting.

[0065] In other examples, the first deformation portion 321 and the second deformation portion 322 are formed by two-time riveting respectively. By performing two-time riveting respectively, the process of riveting can be controlled separately to ensure that the formed first deformation portion 321 and second deformation portion 322 have good morphologies, and at the same time, to avoid the second deformation portion 322 being too shallow due to punch wear during mass production, affecting the anti-rotation effect.

[0066] Furthermore, the second end 32 of the terminal post 30 is first riveted for the first time to form the second deformation portion 322, and then riveted for the second time to form the first deformation portion 321. For example, first, a punch with a linear protrusion is used for riveting to form the second deformation portion 322, and then a conical punch is used for riveting to form the first deformation portion 321. Since the first deformation portion 321 is mainly annular, that is, circumferentially annularly distributed along the second end 32 of the terminal post 30, after the second deformation portion 322 is formed and then the first deformation portion 321 is formed, during the formation of the first deformation portion 321, the first deformation portion 321 can better fill the gap between the terminal post 30 and the first through hole 21 of the voltage-conducting block 20 through deformation, further improving the sealing performance of the riveting between the terminal post 30 and the voltage-conducting block 20 and enhancing the sealing effect of the top cover assembly 100.

[0067] In some embodiments, please combine Figure 3 andFigure 4 The first deformation part 321 has an abutting surface 3210 facing the first end 31. The second deformation part 322 protrudes from the abutting surface 3210. The first through hole 21 has a first stepped surface 210. The abutting surface 3210 abuts against the first stepped surface 210, and the third deformation part 22 is formed on the first stepped surface 210.

[0068] Through the cooperation between the abutting surface 3210 and the first stepped surface 210, the connection stability between the pole column 30 and the voltage-conducting block 20 can be improved, and the pole column 30 can be prevented from being removed from the first through hole 21. By forming the second deformation part 322 on the abutting surface 3210 and forming the third deformation part 22 on the first stepped surface 210, the structure after the connection between the pole column 30 and the voltage-conducting block 20 can be made more compact, and at the same time, the effect of preventing relative rotation between the pole column 30 and the voltage-conducting block 20 is achieved.

[0069] Optionally, the first through hole 21 is a stepped hole. Along the through direction of the first through hole 21, the first through hole 21 includes a first hole section 211 and a second hole section 212 that are connected in sequence. The first hole section 211 is close to the top cover body 10. The inner diameter of the second hole section 212 is larger than the inner diameter of the first hole section 211. The first stepped surface 210 is formed at the connection between the first hole section 211 and the second hole section 212, and the third deformation part 22 is formed on the first hole section 211. By setting the first through hole 21 as a stepped hole and making the inner diameter of the second hole section 212 larger than the inner diameter of the first hole section 211, in this way, the second hole section 212 can provide sufficient accommodation space for the first deformation part 321 and make the first deformation part 321 snap into the second hole section 212, so as to realize the connection between the pole column 30 and the voltage-conducting block 20 and prevent the pole column 30 from being disengaged from the voltage-conducting block 20.

[0070] In some embodiments, one of the second deformation part 322 and the third deformation part 22 is a protrusion, and the other is a groove. By using the mutual cooperation between the protrusion and the groove, the mutual engagement between the second deformation part 322 and the third deformation part 22 can be realized, so as to limit the circumferential rotation of the pole column 30 relative to the voltage-conducting block 20 along the circumference of the voltage-conducting block 20. As Figure 3 shown in the example, the second deformation part 322 is a protrusion, and the third deformation part 22 is a groove.

[0071] Furthermore, there are multiple second deformation parts 322, and the multiple second deformation parts 322 are spaced apart and evenly distributed along the center of the pole column 30. By forming multiple second deformation parts 322, a second deformation part 322 with a larger area can be set in the limited space of the first deformation part 321, further improving the anti-torsion performance of the pole column 30. And the even distribution can evenly disperse the riveting pressure on the outer periphery of the pole column 30, thereby further improving the sealing performance.

[0072] Optionally, there are two second deformed portions 322, and the two second deformed portions 322 are symmetrically arranged with respect to the center of the pole post 30. The two second deformed portions 322 arranged symmetrically along the center of the pole post 30 can be completed by one-time punching and riveting with a punch, improving the punching and riveting efficiency. Among them, the punching and riveting pattern of the punch is arranged symmetrically along the center of the pole post 30. For example, a punch with a linear protrusion can reduce the number of punching and riveting operations on the premise of forming a sufficient number of second deformed portions 322.

[0073] In some embodiments, such as Figure 2 and Figure 3 As shown, the pole post 30 includes a column body 33 and a connecting portion 34. The column body 33 passes through the pole post through-hole 11 and the first through-hole 21, and the column body 33 includes the aforementioned first end 31 and second end 32. The connecting portion 34 is connected to the first end 31 of the column body 33. The outer periphery of the connecting portion 34 protrudes from the outer periphery of the column body 33 to be connected to the top cover body 10 and is located on the other side of the top cover body 10. The connecting portion 34 is used to connect to the electrode assembly of the energy storage device. By providing the connecting portion 34, on the one hand, the connection area between the pole post 30 and the electrode assembly can be increased, improving the reliability of the electrical connection between the pole post 30 and the electrode assembly. On the other hand, the pole post 30 can be clamped to the top cover body 10 to prevent the pole post 30 from disengaging from the top cover body 10.

[0074] In some embodiments, please refer to Figures 5 to 7 , the voltage-conducting block 20 includes a first pressing block 23 and a second pressing block 24. The second pressing block 24 is sleeved on the outer periphery of the first pressing block 23. The first pressing block 23 is provided with a first through-hole 21. The pole post 30 passes through the first pressing block 23 and is riveted to the first pressing block 23. The third deformed portion 22 abuts against the first pressing block 23. Both the pole post 30 and the first pressing block 23 are made of copper, and the second pressing block 24 is an aluminum pressing block.

[0075] Since the voltage-conducting block 20 needs to be welded to the bus bar to realize the electrical connection of adjacent energy storage devices in the energy storage device module, and there is a problem that it is difficult to weld due to different base metals between the voltage-conducting block 20 and the bus bar. For example, the pole post 30 of the negative electrode usually uses a copper post. Correspondingly, the voltage-conducting block 20 connected to the negative electrode pole post 30 is usually also set as a copper pressing block, while the bus bar usually uses an aluminum part. Therefore, there is a problem that it is difficult to weld the voltage-conducting block 20 and the bus bar. Based on this, the voltage-conducting block 20 is set as the first pressing block 23 and the second pressing block 24, and the first pressing block 23 is a copper pressing block and the second pressing block 24 is an aluminum pressing block. In this way, by using the conversion function of the second pressing block 24, on the premise of avoiding the direct welding of two different metal materials of the pole post 30 and the bus bar, a better electrical connection between the bus bar and the first pressing block 23 is realized, and then the electrical connection between the bus bar and the pole post 30 is realized.

[0076] In some embodiments, the second pressing block 24 is provided with a second through hole 240, the second through hole 240 corresponds to and communicates with the pole post through hole 11, the second through hole 240 is a stepped hole, including a third hole section 2401 and a fourth hole section 2402 connected in sequence, the third hole section 2401 is close to the top cover body 10, the inner diameter of the fourth hole section 2402 is larger than that of the third hole section 2401, and the first pressing block 23 is arranged in the fourth hole section 2402. By setting the second through hole 240 as a stepped hole, on the one hand, the first pressing block 23 can be clamped in the second pressing block 24, and the first pressing block 23 is clamped by the first riveting part of the pole post 30, so that the second pressing block 24 is connected to the top cover body 10, avoiding the second pressing block 24 from coming off the top cover body 10. On the other hand, the stepped hole can increase the connection area between the first pressing block 23 and the second pressing block 24, thereby improving the reliability of the physical connection and electrical connection between the two.

[0077] In some embodiments, the first pressing block 23 has a first surface 230 away from the top cover body 10, the second pressing block 24 has a second surface 241 away from the top cover body 10, the first deformation part 321 has a third surface 3211, the orientations of the first surface 230, the second surface 241 and the third surface 3211 are the same, and the first surface 230 is flush with the third surface 3211. Along the axial direction of the pole post 30, the second surface 241 at least protrudes from the first surface 230 and / or the third surface 3211, and the protruding height h of the second surface 241 ≥ 0.5 mm. For example, h can take values such as 0.5 mm, 0.6 mm, 0.7 mm, etc. In some examples, when the first surface 230 is flush with the third surface 3211, the pole post 30 and the first pressing block 23 form an integral body, which helps the two to be connected at the joint part of the first surface 230 and the third surface 3211. At this time, the second surface 241 protrudes from the first surface 230 and the third surface 3211. In this way, when the second surface 241 is welded to the bus bar, a certain gap can be generated between the first surface 230 and the third surface 3211 and the bus bar, so as to avoid the bus bar and prevent interference between the pole post 30 or the first pressing block 23 and the bus bar. Of course, in other examples, if the first surface 230 is not flush with the third surface 3211, the second surface 241 at least protrudes from any one of the first surface 230 or the third surface 3211, so as to avoid interference between the second pressing block 24 and the first surface 230 or the third surface 3211 during the welding process of the second pressing block 24 and the bus bar.

[0078] Exemplarily, the first pressing block 23 is welded to the first deformation part 321. By welding the first deformation part 321 to the first pressing block 23, the connection strength between the pole post 30 and the first pressing block can be enhanced, thereby improving the anti-torsion performance between the pole post 30 and the first pressing block 23. Welding connection can slow down the creep generated after riveting and improve the reliability of the electrical connection between the pole post 30 and the first pressing block 23.

[0079] In some embodiments, along the radial direction of the second pressing block 24, there is a distance d between the weld formed by welding the first pressing block 23 and the first deformation part 321 and the second pressing block 24, and d≥0.5 mm. For example, d can take values such as 0.5 mm, 0.6 mm, 0.7 mm, etc. By designing a certain distance between the weld and the second pressing block 24, contact or interference between the weld and the second pressing block 24 can be avoided. Since the second pressing block 24 is an aluminum pressing block and the first pressing block 23 is a copper pressing block, and their materials are different, when welding the first deformation part 321 and the first pressing block 23, avoiding contact with the second pressing block 24 can reduce the generation of welding defects, thereby improving the welding effect.

[0080] In some embodiments, a chamfer 242 is provided at one end of the second through hole 240 facing the top cover. During the process of inserting the second end 32 of the pole column 30 into the second through hole 240, the chamfer 242 can provide guidance for the pole column 30, avoiding collision between the pole column 30 and the outer periphery of the second through hole 240, thereby improving the assembly yield and efficiency.

[0081] In a second aspect, please refer to Figure 8 , the present application further provides an energy storage device 200, including a housing 201, an electrode assembly (not shown), and a top cover assembly 100 as described in the foregoing first aspect. The housing 201 has an opening 2011. The electrode assembly is disposed in the housing 201 and is electrically connected to the pole column 30 of the top cover assembly 100. The top cover body 10 is disposed on the housing 201 and covers the opening 2011.

[0082] In a third aspect, please refer to Figure 9 , the present application further provides an electrical device 300. The electrical device 300 has the energy storage device 200 as described in the foregoing second aspect, and the energy storage device 200 supplies power to the electrical device 300. Among them, the electrical device 300 can be a means of transportation such as an electric vehicle.

[0083] The top cover assembly, energy storage device, and electrical device disclosed in the embodiments of the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the top cover assembly, energy storage device, and electrical device of the present invention and their core ideas; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A top cover assembly, characterized in that, The top cover assembly is applied to an energy storage device, and includes: A top cover body, wherein the top cover body is provided with a pole through hole; A conductive voltage block is arranged on one side of the top cover body, and the conductive voltage block is provided with a first through hole, and the first through hole corresponds to and is connected to the pole through hole; A pole, the pole having a first end and a second end opposite to each other, the first end being located on a side of the top cover body away from the conductive voltage block, the first end being used to connect to an electrode assembly of the energy storage device, the second end being inserted through the pole through hole and the first through hole, the second end being riveted to the conductive voltage block to form a first deformation portion and a second deformation portion on the second end, the first deformation portion being formed at an end portion of the second end to limit the pole from moving relative to the conductive voltage block along the pole axis direction, the second deformation portion being located on a side of the first deformation portion facing the first end, the conductive voltage block forming a third deformation portion corresponding to the second deformation portion, the third deformation portion being configured to cooperate and connect with the second deformation portion to limit the pole from rotating relative to the conductive voltage block; The conductive pressure block includes a first pressure block and a second pressure block, the second pressure block is sleeved on the outer circumference of the first pressure block, the first pressure block is provided with the first through hole, the pole is passed through the first pressure block and riveted to the first pressure block, and the third deformation portion abuts against the first pressure block; The pole and the first pressing block are both made of copper, and the second pressing block is an aluminum pressing block.

2. The top cover assembly according to claim 1, wherein The first deformation portion and the second deformation portion are respectively formed by two punch riveting operations.

3. The top cover assembly according to claim 2, characterized in that, The second end is subjected to a first riveting operation to form the second deformed portion, and the second end is subjected to a second riveting operation to form the first deformed portion.

4. The top cover assembly according to claim 1, wherein The first deformation portion has an abutting surface facing the first end, the second deformation portion is protruded from the abutting surface, the first through hole has a first step surface, the abutting surface abuts against the first step surface, and the third deformation portion is formed on the first step surface.

5. The top cover assembly according to claim 4, characterized in that The first through hole is a stepped hole. Along the through direction of the first through hole, the first through hole includes a first hole segment and a second hole segment connected in sequence. The first hole segment is close to the top cover body, the inner diameter of the second hole segment is larger than the inner diameter of the first hole segment, the first step surface is formed at the connection between the first hole segment and the second hole segment, and the third deformation portion is formed in the first hole segment.

6. The top cover assembly according to claim 1, wherein, One of the second deformation portion and the third deformation portion is a protrusion, and the other is a groove.

7. The top cover assembly according to claim 1, wherein, There are a plurality of second deformation portions, and the plurality of second deformation portions are spaced apart and evenly distributed along the center of the pole.

8. The top cover assembly according to claim 6, characterized in that, There are two second deformation parts, and the two second deformation parts are symmetrically arranged relative to the center of the pole.

9. The top cover assembly according to claim 1, wherein, The second pressing block is provided with a second through hole, which corresponds to and is connected to the pole through hole. The second through hole is a stepped hole, including a third hole segment and a fourth hole segment connected in sequence. The third hole segment is close to the top cover body, and the inner diameter of the fourth hole segment is larger than the inner diameter of the third hole segment. The first pressing block is arranged in the fourth hole segment.

10. The top cover assembly according to claim 1, characterized in that, The first pressing block has a first surface facing away from the top cover body, the second pressing block has a second surface facing away from the top cover body, the first deformation part has a third surface, and the first surface, the second surface and the third surface face the same direction, and the first surface is flush with the third surface; Along the axial direction of the pole column, the second surface protrudes at least from the first surface and / or the third surface, and the protruding height h of the second surface is h≥0.5 mm.

11. The top cover assembly according to claim 1, characterized in that, A chamfer is provided at one end of the second through hole facing the top cover.

12. The top cover assembly according to claim 9, wherein The first pressing block is connected to the first deformation part by welding.

13. The top cover assembly according to claim 12, characterized in that, Along the radial direction of the second pressing block, the weld formed by welding the first pressing block and the first deformation part has a distance d from the second pressing block, and d≥0.5 mm.

14. The top cover assembly according to any one of claims 1-8, characterized in that, The pole column includes a column body and a connecting part. The column body passes through the pole column through hole and the first through hole, and the column body includes the first end and the second end. The connecting part is connected to the first end of the column body, and the outer periphery of the connecting part protrudes from the outer periphery of the column body to be connected to the top cover body and located on the other side of the top cover body. The connecting part is used to connect to the electrode assembly of the energy storage device.

15. An energy storage device, characterized in that, It includes a housing, an electrode assembly and a top cover assembly according to any one of claims 1-12. The housing has an opening. The electrode assembly is arranged in the housing and is electrically connected to the pole column of the top cover assembly. The top cover body is arranged on the housing and covers the opening.

16. An electrical device, characterized in that, There is an energy storage device as described in claim 15, and the energy storage device supplies power to the electrical equipment.

Images