Leading-out sheet, cover plate assembly, battery, battery pack and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a lead-out sheet, a cover plate assembly, a battery, a battery pack and an electric device. The lead-out sheet is provided with a first surface, a second surface and a side wall surface, the first surface is opposite to the second surface in the first direction, and the side wall surface is connected between the first surface and the second surface; an accommodating groove is formed in the first surface and is suitable for accommodating a pole part of the battery; the second surface is suitable for welding a tab of a pole core of the battery, the whole surface of the second surface can be used for welding the tab, the pole does not occupy a weldable area on the second surface, and the welding area of the lead-out sheet and the tab can be effectively increased, so that the overcurrent capacity and the quick charge capacity of the battery can be improved, and the safety and the reliability of the battery are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a lead-out sheet, a cover plate assembly, a battery, a battery pack and an electrical device. Background Art

[0002] At present, the overall structure of the battery cover plate is getting smaller and smaller, and it is required to have good over-current capacity within the limited cover plate space, which requires increasing the welding area between the lead-out sheet and the tab.

[0003] In the existing battery cover plates, a pole post mounting hole is designed on the lead-out sheet. After the pole post is welded to the lead-out sheet, the weld bead protrudes from the surface of the lead-out sheet, which is easy to scratch the tab. Moreover, due to the uneven weld bead at the position of the pole post on the lead-out sheet, the tab cannot be welded, greatly reducing the welding space of the tab, thereby affecting the over-current capacity of the battery. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: aiming at the problem that the tab cannot be welded at the position of the pole post on the existing lead-out sheet due to the uneven weld bead, greatly reducing the welding space of the tab, a lead-out sheet, a cover plate assembly, a battery, a battery pack and an electrical device are provided.

[0005] To solve the above technical problem, on the one hand, an embodiment of the utility model provides a lead-out sheet, which has a first surface, a second surface and a side surrounding surface. The first surface and the second surface are opposite in a first direction, and the side surrounding surface is connected between the first surface and the second surface;

[0006] The first surface is provided with a receiving groove, and the receiving groove is adapted to receive a part of the pole post of the battery;

[0007] The second surface is adapted to weld the tab of the pole core of the battery.

[0008] Optionally, the second surface is a continuous surface.

[0009] Optionally, the lead-out sheet is in a flat plate shape.

[0010] Optionally, the receiving groove penetrates the lead-out sheet in a second direction perpendicular to the first direction.

[0011] On the other hand, an embodiment of the present utility model provides a cover plate assembly, which includes a cover plate, a pole column, a first insulating member, and the lead-out piece as described above. The cover plate, the first insulating member, and the lead-out member are stacked along the first direction. One end of the pole column is at least partially received in the receiving groove and is welded to at least one of the first surface and the side circumferential surface. A pole column through-hole is provided on the cover plate, and a first connection hole facing the pole column through-hole is provided on the first insulating member. The other end of the pole column passes through the first connection hole and the pole column through-hole in a direction away from the lead-out piece.

[0012] Optionally, the pole column includes a column body and a pole column flange. The pole column flange is received in the receiving groove. One end of the column body is connected to the pole column flange, and the other end of the column body passes through the first connection hole and the pole column through-hole.

[0013] Optionally, the pole column further includes a boss. The boss is connected to the pole column flange and is located outside the receiving groove. The boss extends in a direction away from the column body along the first direction, and the boss is welded to the lead-out piece.

[0014] Optionally, a relief groove is provided on the lead-out piece. The relief groove extends along the first direction, and the boss is disposed in the relief groove.

[0015] Optionally, a notch is provided on the side circumferential surface. The notch penetrates the lead-out piece along the first direction to form the relief groove.

[0016] Optionally, the boss includes a first boss and a second boss. The first boss and the second boss are oppositely disposed on the pole column flange, and the first boss and the second boss are welded to opposite sides of the lead-out piece in a second direction perpendicular to the first direction.

[0017] Optionally, the surface of the boss away from the cover plate is located between the first surface and the second surface in the first direction.

[0018] Optionally, a step is provided on the lead-out piece. The step has a first connection surface and a second connection surface. The first connection surface is connected between the second connection surface and the second surface, and the second connection surface is located between the first surface and the second surface in the first direction;

[0019] The surface of the boss away from the cover plate is coplanar with the second connection surface.

[0020] Optionally, a plurality of pole columns are provided, and a plurality of receiving grooves are provided on the lead-out piece at intervals. The plurality of pole columns and the plurality of receiving grooves are arranged in one-to-one correspondence.

[0021] Optionally, it further includes a second insulating member and a conductive terminal, and the conductive terminal, the second insulating member and the cover plate are stacked along the first direction;

[0022] The second insulating member is provided with a second connection hole, and the other end of the pole column sequentially passes through the first connection hole, the pole column through hole and the second connection hole and is connected to the conductive terminal.

[0023] Optionally, the cover plate is provided with a first groove, and the second insulating member is installed in the first groove;

[0024] The second insulating member is provided with a second groove, and the conductive terminal is installed in the second groove.

[0025] Optionally, it further includes a sealing ring, and the sealing ring is sleeved on the outer peripheral side of the pole column;

[0026] The sealing ring includes a first sealing ring and a second sealing ring. The second sealing ring is connected to one end of the first sealing ring away from the lead-out piece. The first sealing ring is arranged between the inner wall surface of the first connection hole and the outer surface of the pole column, and the second sealing ring is arranged between the inner wall surface of the pole column through hole and the outer surface of the pole column.

[0027] On the other hand, an embodiment of the present invention provides a battery, including the cover plate assembly as described above.

[0028] On the other hand, an embodiment of the present invention provides a battery pack, including the battery as described above.

[0029] On yet another hand, an embodiment of the present invention provides an electrical device, including the battery pack as described above, or the battery as described above.

[0030] The lead-out piece provided by the embodiment of the present invention, by providing a receiving groove on the first surface, the receiving groove does not penetrate the second surface of the lead-out piece along the first direction, thereby avoiding the pole column from affecting the tab welding area on the second surface, so that the entire surface of the second surface can be welded with tabs, the pole column does not occupy the weldable area on the second surface, and can effectively increase the welding area between the lead-out piece and the tab, thereby being able to improve the over-current capacity and fast charging capacity of the battery and enhance the safety and reliability of the battery. Description of the Drawings

[0031] Figure 1 is a schematic diagram of a lead-out piece provided by an embodiment of the present invention;

[0032] Figure 2 is another schematic diagram of a lead-out piece provided by an embodiment of the present invention;

[0033] Figure 3It is an exploded view of the cover plate assembly provided by an embodiment of the present utility model;

[0034] Figure 4 It is a sectional view of the cover plate assembly provided by an embodiment of the present utility model;

[0035] Figure 5 It is a schematic diagram of the terminal post provided by an embodiment of the present utility model;

[0036] Figure 6 It is a schematic diagram of the cooperation between the terminal post and the lead-out sheet provided in Embodiment 1 of the present utility model;

[0037] Figure 7 It is a schematic diagram of the cooperation between the terminal post and the lead-out sheet provided in Embodiment 2 of the present utility model;

[0038] Figure 8 It is a schematic diagram of the cooperation between the terminal post and the lead-out sheet provided in Embodiment 3 of the present utility model;

[0039] Figure 9 It is a schematic diagram of the battery provided by an embodiment of the present utility model.

[0040] The reference numerals in the specification are as follows:

[0041] 10. Cover plate assembly;

[0042] 1. Lead-out sheet; 11. First surface; 12. Second surface; 13. Side surrounding surface; 131. Third surface; 132. Fourth surface; 14. Accommodating groove; 15. Avoidance groove; 151. First avoidance groove; 152. Second avoidance groove; 16. Step; 161. First connection surface; 162. Second connection surface;

[0043] 2. Terminal post; 21. Column body; 22. Terminal post flange; 23. Boss; 231. First boss; 232. Second boss;

[0044] 3. Cover plate; 31. Terminal post through hole; 32. First groove; 33. First liquid injection hole;

[0045] 4. First insulating part; 41. First connection hole; 42. Second liquid injection hole;

[0046] 5. Second insulating part; 51. Second connection hole; 52. Second groove;

[0047] 6. Conductive terminal; 61. Third connection hole;

[0048] 7. Sealing ring; 71. First sealing ring; 72. Second sealing ring;

[0049] 20. Shell;

[0050] a, the first direction; b, the second direction; c, the third direction. Detailed implementation

[0051] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0052] As Figures 1 to 8 shown, a lead-out piece 1 provided by an embodiment of the present utility model is used to connect with the electrode core of the battery, and the electric energy in the battery is transmitted to the outside through the electrode post 2 of the battery by the electrode post 2, so as to realize the transmission of electric energy.

[0053] The lead-out piece 1 has a first surface 11, a second surface 12 and a side surrounding surface 13. The first surface 11 and the second surface 12 are opposite in the first direction a, and the side surrounding surface 13 is connected between the first surface 11 and the second surface 12. A receiving groove 14 is provided on the first surface 11. The receiving groove 14 is recessed from the first surface 11 towards the second surface 12, and the receiving groove 14 is adapted to receive a part of the electrode post 2 of the battery. One end of the electrode post 2 of the battery is installed in the receiving groove 14, and the other end of the electrode post 2 can be connected to an external component, and electric energy is transmitted through the lead-out piece 1 and the electrode post 2. The second surface 12 is adapted to weld the electrode tab of the electrode core.

[0054] Among them, the receiving groove 14 is provided on the first surface 11 and does not extend to the second surface 12 in the first direction, that is, the dimension of the receiving groove 14 in the first direction a is smaller than the dimension of the lead-out piece 1 in the first direction a. The receiving groove 14 is in the form of a blind hole. The first direction a is the thickness direction of the lead-out piece 1. The dimension of the receiving groove 14 in the first direction is the depth of the receiving groove 14, and the dimension of the lead-out piece 1 in the first direction is the thickness of the lead-out piece 1. By setting that the receiving groove 14 does not penetrate the lead-out piece 1 in the first direction a, it can be avoided that the electrode post 2 affects the electrode tab welding area on the second surface 12. Compared with the existing lead-out piece 1, the welding area between the lead-out piece 1 and the electrode tab is effectively increased, so that the over-current capacity and fast charging capacity of the battery can be improved, and the safety and reliability of the battery can be improved.

[0055] In one embodiment, the second surface 12 is a continuous plane. The continuous surface is a surface without recessed structures such as holes or grooves. There are no breaks, jumps or mutations on the second surface 12, but it extends smoothly and continuously, so that the entire surface of the second surface 12 can weld the electrode tab, and the electrode post 2 does not occupy the weldable area on the second surface 12.

[0056] In one embodiment, as Figure 1 , Figure 2As shown, the lead-out piece 1 is in a flat plate shape, and the first surface 11 and the second surface 12 are arranged in parallel and are planes, which is convenient for welding the tab on the second surface 12. Among them, the thickness of the lead-out piece 1 is the distance between the first surface 11 and the second surface 12 in the first direction a.

[0057] During riveting, only the second surface 12 needs to be supported. Compared with the existing method that requires supporting both the surface of the lead-out piece 1 and the surface of the pole column 2, the tolerance dimension chain is reduced, avoiding the situation of the bottom of the pole column 2 collapsing or the pole column 2 deforming.

[0058] In one embodiment, the lead-out piece 1 is formed by stamping or upsetting, with low processing difficulty and easier to ensure product accuracy.

[0059] In one embodiment, as Figure 1 、 Figure 3 shown, the accommodating groove 14 penetrates the lead-out piece 1 along the second direction b perpendicular to the first direction a, and the pole column 2 and the lead-out piece 1 can be welded from the side surrounding surface 13, so that the weld bead between the pole column 2 and the lead-out piece 1 is located on the side surrounding surface 13, avoiding the weld bead affecting the tab. The second direction b is the width direction of the lead-out piece 1.

[0060] Among them, the side surrounding surface 13 has a third surface 131 and a fourth surface 132 arranged oppositely in the second direction b. The third surface 131 and the fourth surface 132 are arranged in parallel between the first surface 11 and the second surface 12, and the accommodating groove 14 extends from the third surface 131 to the fourth surface 132, so that the pole column 2 can be welded from the third surface 131 and the fourth surface 132 during welding.

[0061] On the other hand, as Figures 3 to 8 shown, an embodiment of the present invention provides a cover plate assembly 10, including a cover plate 3, a pole column 2, a first insulating member 4 and the lead-out piece 1 of the above embodiment. The cover plate 3, the first insulating member 4 and the lead-out piece 1 are stacked along the first direction a. The first surface 11 of the lead-out piece 1 faces the cover plate 3, and the second surface 12 faces the lead-out piece 1. The cover plate 3 can be connected to the housing 20 of the battery, and the first insulating member 4 insulates between the cover plate 3 and the lead-out piece 1, avoiding conduction between the lead-out piece 1 and the cover plate 3.

[0062] One end of the terminal post 2 is at least partially received in the receiving groove 14, and one end of the terminal post 2 is welded to at least one of the first surface 11 and the side surrounding surface 13. A terminal post through hole 31 is provided on the cover plate 3, and a first connection hole 41 facing the terminal post through hole 31 is provided on the first insulating member 4. The terminal post through hole 31 and the first connection hole 41 are communicated and coaxial. The other end of the terminal post 2 passes through the first connection hole 41 and the terminal post through hole 31 in a direction away from the lead-out piece 1. By connecting one end of the terminal post 2 in the receiving groove 14 of the lead-out piece 1 and passing the other end of the terminal post 2 through the first connection hole 41 and the terminal post through hole 31 in sequence, the assembly of the lead-out piece 1, the terminal post 2, and the cover plate 3 can be realized, and the other end of the terminal post 2 can transmit electric energy to the outside.

[0063] Wherein, one end of the terminal post 2 is welded to at least one of the first surface 11 and the side surrounding surface 13, and the welding seam between the lead-out piece 1 and the terminal post 2 is located on the first surface 11 and / or the side surrounding surface 13, avoiding the situation that the welding seam is located on the second surface 12 and affecting the welding area of the pole ear, so that the entire surface of the second surface 12 can be welded with the pole ear, thereby increasing the welding area and improving the current-carrying capacity.

[0064] In one embodiment, as Figure 3 shown, a first liquid injection hole 33 is provided on the cover plate 3, and a second liquid injection hole 42 facing the first liquid injection hole 33 is provided on the first insulating member 4. The electrolyte can be injected into the battery housing 20 through the first liquid injection hole 33 and the second liquid injection hole 42.

[0065] In one embodiment, as Figure 3 、 Figure 5 shown, the terminal post 2 includes a column body 21 and a terminal post flange 22. The terminal post flange 22 is received in the receiving groove 14. One end of the column body 21 is connected to the terminal post flange 22, and the other end of the column body 21 passes through the first connection hole 41 and the terminal post through hole 31 in sequence. The electric energy of the battery is transmitted to the outside through the lead-out piece 1, the terminal post flange 22, and the terminal post 2 in sequence.

[0066] Wherein, the contour of the receiving groove 14 is consistent with the outer contour of the terminal post flange 22. The connection between the terminal post 2 and the lead-out piece 1 is realized through the cooperation of the terminal post flange 22 and the receiving groove 14. After riveting, the terminal post flange 22 and the lead-out piece 1 are more closely attached, which can reduce the internal resistance of the battery.

[0067] In one embodiment, the column body 21 can be, but is not limited to, cylindrical, elliptical columnar, or special-shaped columnar. The terminal post 2 can be manufactured by upsetting or machining, with low processing cost of parts and easier guarantee of product precision.

[0068] In one embodiment, as Figure 3As shown, the terminal post 2 further includes a boss 23. The boss 23 is connected to the terminal post flange 22 and is located outside the receiving groove 14. The boss 23 extends in the first direction a away from the column body 21. The boss 23 is welded to the lead-out piece 1. At this time, the welding seam between the lead-out piece 1 and the terminal post 2 is located on the side surrounding surface 13, which can avoid the situation that the strength of the lead-out piece 1 is affected by simultaneous welding on the first surface 11 and the second surface 12.

[0069] In one embodiment, as Figure 6 , Figure 7 shown, the lead-out piece 1 is provided with an avoidance groove 15. The avoidance groove 15 extends in the first direction a. The boss 23 is arranged in the avoidance groove 15. When assembling the terminal post 2 and the lead-out piece 1, the terminal post flange 22 is received in the receiving groove 14, and the boss 23 is arranged in the avoidance groove 15. Through the avoidance groove 15, the boss 23 can be avoided, so that the size of the upper cover assembly 10 in the second direction b will not be too large after assembly.

[0070] In one embodiment, a notch is provided on the side surrounding surface 13. The notch penetrates the lead-out piece 1 in the first direction a to form an avoidance groove 15, that is, the avoidance groove 15 is arranged at the edge of the lead-out piece 1, which is convenient for welding the boss 23 from the side surrounding surface 13.

[0071] Preferably, the size of the avoidance groove 15 in the second direction b is the same as the size of the boss 23, so that the boss 23 will not protrude from the lead-out piece 1 in the second direction.

[0072] As an example, as Figure 7 , Figure 8 shown, the boss 23 includes a first boss 231 and a second boss 232. The first boss 231 and the second boss 232 are oppositely arranged on the terminal post flange 22. The first boss 231 and the second boss 232 are welded to the opposite sides of the lead-out piece 1 in the second direction b.

[0073] The avoidance groove 15 includes a first avoidance groove 151 and a second avoidance groove 152. The first avoidance groove 151 is arranged on the third surface 131 of the lead-out piece 1, and the second avoidance groove 152 is arranged on the fourth surface 132 of the lead-out piece 1. The first boss 231 is arranged in the first avoidance groove 151, and the second boss 232 is arranged in the second avoidance groove 152.

[0074] Wherein, the dimension of the first boss 231 in the second direction b is consistent with the dimension of the first avoidance groove 151, and the surface of the first boss 231 away from the second boss 232 is coplanar with the third surface 131. The dimension of the second boss 232 is consistent with the dimension of the second avoidance groove 152, and the surface of the second boss 232 away from the first boss 231 is coplanar with the fourth surface 132, so that the first boss 231 will not protrude from the third surface 131 in the second direction b, and the second boss 232 will not protrude from the fourth surface 132, without increasing the overall dimension of the cover plate assembly 10.

[0075] As an example, the notch on the third surface 131 penetrates through the lead-out piece 1 in the first direction to form the first avoidance groove 151. The notch on the fourth surface 132 penetrates through the lead-out piece 1 in the first direction to form the second avoidance groove 152. Among them, the first avoidance groove 151 can be recessed from the third surface 131 towards the fourth surface 132, and the second avoidance groove 152 can be recessed from the fourth surface 132 towards the third surface 131, so that the relatively arranged first boss 231 and second boss 232 respectively enter the first avoidance groove 151 and the second avoidance groove 152.

[0076] In one embodiment, as Figure 6 shown, when no avoidance groove is provided on the lead-out piece 1, the boss 23 adheres to one surface of the side wall 13 close to the boss 23, so that the boss 23 protrudes from the lead-out piece 1 in the second direction b. During welding, the welding seam between the lead-out piece 1 and the pole 2 is located on the side wall 13, which can avoid the situation that the lead-out piece 1 is affected in strength due to simultaneous welding on the first surface 11 and the second surface 12.

[0077] Wherein, the surface of the boss 23 close to the side wall 13 is a plane or a curved surface. Correspondingly, the part of the lead-out piece 1 in contact with the boss 23 is set as a plane or a curved surface.

[0078] As an example, the boss 23 includes a first boss 231 and a second boss 232. The first boss 231 and the second boss 232 are oppositely arranged on the pole flange 22, and the first boss 231 and the second boss 232 are welded to the opposite sides of the lead-out piece 1 in the second direction b.

[0079] In the second direction b, the distance between the first boss 231 and the second boss 232 is equal to the width of the lead-out piece 1. The third surface 131 and the fourth surface 132 are both continuous planes. The surface of the first boss 231 close to the second boss 232 adheres to the third surface 131, and the surface of the second boss 232 close to the first boss 23 adheres to the fourth surface 132.

[0080] The surface of the first boss 231 close to the second boss 232 is a plane or a curved surface, and the surface of the second boss 232 close to the first boss 23 is a plane or a curved surface.

[0081] In one embodiment, the surface of the boss 23 away from the cover plate 3 is located between the first surface 11 and the second surface 12 in the first direction a, such that the surface of the boss 23 away from the cover plate 3 is not coplanar with the second surface 12. When the tab is welded to the second surface 12, the tab can completely avoid the weld seam between the boss 23 and the lead-out piece 1, and is not affected by the uneven weld seam, which can greatly reduce the risk of the tab being scratched by the weld seam.

[0082] In one embodiment, as Figure 1 , Figure 2 shown, a step 16 is provided on the lead-out piece 1. The step 16 has a first connection surface 161 and a second connection surface 162. The first connection surface 161 is connected between the second connection surface 162 and the second surface 12. The second connection surface 162 is located between the first surface 11 and the second surface 12 in the first direction a. The surface of the boss 23 away from the cover plate 3 is coplanar with the second connection surface 162.

[0083] Through the first connection surface 161, a gap is formed between the second connection surface 162 and the second surface 12 in the first direction a. The surface of the boss 23 away from the cover plate 3 is coplanar with the second connection surface 162, so that the surface of the boss 23 away from the cover plate 3 is located between the first surface 11 and the second surface 12 in the first direction. When the tab is welded to the second surface 12, the risk of the tab being scratched by the weld seam can be reduced, and at the same time, it is convenient for welding between the boss 23 and the lead-out piece 1.

[0084] Preferably, the second connection surface 162 and the second surface 12 are arranged in parallel.

[0085] In one embodiment, two steps 16 are provided. The steps 16 extend along the third direction c. The dimension of the steps 16 in the third direction is the same as the dimension of the lead-out piece 1 in the third direction. The third direction is the length direction of the lead-out piece 1, that is, the length of the steps 16 is the same as the length of the lead-out piece 1.

[0086] The surface of the first boss 231 away from the cover plate 3 is coplanar with the second connection surface 162 of one step 16, and the surface of the second boss 232 away from the cover plate 3 is coplanar with the second connection surface 162 of the other step 16.

[0087] In an alternative embodiment, the dimension of the steps 16 in the third direction is smaller than the dimension of the lead-out piece 1 in the third direction.

[0088] In one embodiment, a plurality of pole posts 2 are provided. A plurality of receiving grooves 14 are arranged at intervals on the lead-out sheet 1. The plurality of pole posts 2 and the plurality of receiving grooves 14 are arranged in one-to-one correspondence. The use of a plurality of pole posts 2 can improve the electrical conductivity, and the plurality of pole posts 2 can provide a more stable connection. Even if one or several of them fail or are damaged, it will not affect the transmission circuit, ensuring the stability and reliability of the circuit.

[0089] In one embodiment, as Figure 3 、 Figure 4 shown, the cover plate assembly 10 further includes a second insulating member 5 and a conductive terminal 6. The conductive terminal 6, the second insulating member 5 and the cover plate 3 are stacked along the first direction a. The conductive terminal 6 is installed on the side of the cover plate 3 away from the lead-out sheet 1. The second insulating member 5 can insulate between the conductive terminal 6 and the cover plate 3, preventing the conductive terminal 6 and the cover plate 3 from being electrically connected.

[0090] The second insulating member 5 is provided with a second connection hole 51. The second connection hole 51 is aligned with the pole post through hole 31, and the second connection hole 51 and the pole post through hole 31 are coaxial. The end of the pole post 2 away from the lead-out sheet 1 sequentially passes through the first connection hole 41, the pole post through hole 31 and the second connection hole 51 and is connected to the conductive terminal 6.

[0091] Specifically, the end of the column body 21 of the pole post 2 away from the pole post flange 22 sequentially passes through the first connection hole 41, the pole post through hole 31 and the second connection hole 51 and is connected to the conductive terminal 6. Through the pole post 2, the lead-out sheet 1 and the conductive terminal 6 can be electrically connected. The conductive terminal 6 is electrically connected to an external component. The electrical energy of the battery is transmitted to the outside through the lead-out sheet 1, the pole post 2 and the conductive terminal 6.

[0092] In one embodiment, the conductive terminal 6 is provided with a third connection hole 61. The third connection hole 61 is aligned with the pole post through hole 31. The column body 21 of the pole post 2 sequentially passes through the first connection hole 41, the pole post through hole 31 and the second connection hole 51 and is inserted into the third connection hole 61. After riveting, the fixation between the conductive terminal 6 and the pole post 2 is formed.

[0093] Among them, the number of the first connection hole 41, the pole post through hole 31, the second connection hole 51 and the third connection hole 61 is the same as the number of the pole posts 2.

[0094] In one embodiment, as Figure 3 shown, the cover plate 3 is provided with a first groove 32. The second insulating member 5 is installed in the first groove 32. The second insulating member 5 is provided with a second groove 52. The conductive terminal 6 is installed in the second groove 52, so that the cover plate 3, the second insulating member 5 and the conductive terminal 6 are assembled together.

[0095] Among them, the size of the first groove 32 in the first direction is smaller than the size of the second insulating member 5 in the first direction, and the side of the second insulating member 5 away from the conductive terminal 6 is received in the first groove 32. The size of the second groove 52 in the first direction is smaller than the size of the conductive terminal 6 in the first direction, and a part of the conductive terminal 6 is disposed in the second groove 52.

[0096] In one embodiment, as Figure 3 , Figure 4 shown, the cover plate assembly 10 further includes a sealing ring 7. The sealing ring 7 is sleeved on the outer peripheral side of the pole column 2. The sealing ring 7 includes a first sealing ring 71 and a second sealing ring 72. The second sealing ring 72 is connected to one end of the first sealing ring 71 away from the lead-out piece 1. The first sealing ring 71 is disposed between the inner wall surface of the first connection hole 41 and the outer surface of the pole column 2, and can seal between the pole column 2 and the first insulating member 4. The second sealing ring 72 is disposed between the inner wall surface of the pole column through hole 31 and the outer surface of the pole column 2, and can perform insulating sealing between the pole column 2 and the cover plate 3.

[0097] Among them, the inner diameters of the first sealing ring 71 and the second sealing ring 72 are the same, and the outer diameter of the first sealing ring 71 is larger than the outer diameter of the second sealing ring 72.

[0098] In one embodiment, the first sealing ring 71 abuts against the pole column flange 22. After riveting is completed, the first sealing ring 71 is compressed. The first sealing ring 71 can fill the gap between the outer surface of the pole column 2 and the first connection hole 41. The first sealing ring 71 completely covers the pole column flange 22 in the first direction a, thereby isolating the pole column flange 22 from the cover plate 3.

[0099] Preferably, the shape of the first sealing ring 71 is the same as the shape of the pole column flange 22, and the shape of the first sealing ring 71 is square, circular, oval or other shapes.

[0100] When assembling the cover plate assembly 10, after welding the pole column 2 to the lead-out piece 1, the sealing ring 7, the first insulating member 4, the cover plate 3, the second insulating member 5 and the conductive terminal 6 are sequentially installed on the pole column 2, and the components are assembled into one body by riveting. Compared with the existing battery cover plate 3, this cover plate assembly 10 is not affected by uneven welding beads, the tolerance dimension chain is reduced, and the compression amount stability of the sealing ring 7, the safety performance and the service life of the battery can be improved.

[0101] Next, the structure of the cover plate assembly 10 will be described through specific embodiments.

[0102] Embodiment 1

[0103] As Figure 6As shown in the figure, the cover plate assembly 10 includes a conductive terminal 6, a first insulating member 4, a cover plate 3, a second insulating member 5, a sealing ring 7, a pole column 2, and a lead-out piece 1. The conductive terminal 6, the second insulating member 5, the cover plate 3, the first insulating member 4, and the lead-out piece 1 are stacked in the first direction a. The pole column 2 is welded to the lead-out piece 1, and the sealing ring 7 is sleeved outside the pole column 2.

[0104] The lead-out piece 1 has a first surface 11, a second surface 12, and a side surrounding surface 13. The first surface 11 and the second surface 12 are opposite to each other in the first direction a, and a pole lug is welded on the second surface 12. The side surrounding surface 13 has a third surface 131 and a fourth surface 132 arranged oppositely in the second direction b. A step 16 is provided on the lead-out piece 1. The step 16 has a first connection surface 161 and a second connection surface 162, and the first connection surface 161 is connected between the second connection surface 162 and the second surface 12.

[0105] The pole column 2 includes a pole column flange 22, a column body 21, and a boss 23. The boss 23 includes a first boss 231 and a second boss 232. Two steps 16 are provided. In the third direction c, the length of the step 16 is the same as the length of the lead-out piece 1.

[0106] The surface of the first boss 231 away from the cover plate 3 is coplanar with the second connection surface 162 of one step 16, and the surface of the second boss 232 away from the cover plate 3 is coplanar with the second connection surface 162 of the other step 16. The surface of the first boss 231 close to the second boss 232 is attached to the third surface 131, and the surface of the second boss 232 close to the first boss 231 is attached to the fourth surface 132.

[0107] Embodiment 2

[0108] As Figure 7 shown, it is substantially the same as the structure of Embodiment 1, the difference being that an avoidance groove 15 is provided on the lead-out piece 1, and the boss 23 is arranged in the avoidance groove 15.

[0109] Specifically, the avoidance groove 15 includes a first avoidance groove 151 and a second avoidance groove 152. The first boss 231 is arranged in the first avoidance groove 151, and the second boss 232 is arranged in the second avoidance groove 152.

[0110] The surface of the first boss 231 away from the second boss 232 is coplanar with the third surface 131, and the surface of the second boss 232 away from the first boss 231 is coplanar with the fourth surface 132.

[0111] Embodiment 3

[0112] As Figure 8As shown, it is substantially the same as the structure of the second embodiment, except that the dimension of the step 16 in the third direction is smaller than the dimension of the lead-out piece 1 in the third direction, and the dimension of the step 16 in the third direction is set according to the dimension of the boss 23 in the third direction. When assembling the terminal post 2, the number of steps 16 is set according to the number of terminal posts 2. Two bosses 23 are provided on each terminal post 2, and the total number of steps 16 is twice the number of bosses 23.

[0113] On the other hand, as Figure 9 shown, an embodiment of the present invention provides a battery, including the cover plate assembly 10 of the above embodiment.

[0114] In one embodiment, the battery includes a housing 20, a battery core, a positive cover plate assembly and a negative cover plate assembly. The battery core is disposed inside the housing 20. Both ends of the housing 20 are open. The positive cover plate assembly is connected to one open end of the housing 20, and the negative cover plate assembly is connected to the other open end of the housing 20. At least one of the positive cover plate assembly and the negative cover plate assembly is the above cover plate assembly 10.

[0115] The positive electrode tab of the battery is connected to the second surface 12 of the positive cover plate assembly, and the negative electrode tab of the battery is connected to the second surface 12 of the negative cover plate assembly.

[0116] In another embodiment, the battery includes a housing 20, a battery core and a cover plate assembly 10. The battery core is disposed inside the housing 20. One end of the housing 20 is open, and the cover plate assembly 10 is connected to the open end of the housing 20.

[0117] The cover plate assembly 10 includes a conductive terminal 6, a first insulating member 4, a cover plate 3, a second insulating member 5, a sealing ring 7, a terminal post 2 and a lead-out piece 1. Among them, the conductive terminal 6 includes a positive conductive terminal and a negative conductive terminal. The terminal post 2 includes a positive terminal post and a negative terminal post. The lead-out piece 1 includes a positive lead-out piece and a negative lead-out piece. The positive lead-out piece is conducted with the positive conductive terminal through the positive terminal post, and the negative lead-out piece is conducted with the negative conductive terminal through the negative terminal post.

[0118] On the other hand, an embodiment of the present invention provides a battery pack, including the battery of the above embodiment.

[0119] On the other hand, an embodiment of the present invention provides an electrical device, including the battery pack of the above embodiment or the battery of the above embodiment.

[0120] In some embodiments, the electrical device is a vehicle, and the battery pack provides electrical energy for the vehicle.

[0121] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lead-out piece, characterized in that, The lead-out piece has a first surface, a second surface and a side surrounding surface. The first surface and the second surface are opposite in a first direction, and the side surrounding surface is connected between the first surface and the second surface; The first surface is provided with a receiving groove which is adapted to receive a part of the pole column of the battery; The second surface is adapted to weld the tab of the electrode core of the battery.

2. The lead-out piece according to claim 1, characterized in that, The second surface is a continuous plane.

3. The lead-out piece according to claim 1, characterized in that, The lead-out piece is in the shape of a flat plate.

4. The lead-out piece according to claim 1, characterized in that, The receiving groove penetrates the lead-out piece in a second direction perpendicular to the first direction.

5. A cover plate assembly, characterized in that, It includes a cover plate, a pole column, a first insulating member and the lead-out piece according to any one of claims 1-4. The cover plate, the first insulating member and the lead-out member are stacked along the first direction. One end of the pole column is at least partially received in the receiving groove and is welded to at least one of the first surface and the side surrounding surface. A pole column through hole is provided on the cover plate, and a first connection hole is provided on the first insulating member opposite to the pole column through hole. The other end of the pole column passes through the first connection hole and the pole column through hole in a direction away from the lead-out piece.

6. The cover plate assembly according to claim 5, wherein, The pole column includes a column body and a pole column flange. The pole column flange is received in the receiving groove. One end of the column body is connected to the pole column flange, and the other end of the column body passes through the first connection hole and the pole column through hole.

7. The cover plate assembly according to claim 6, wherein, The pole column further includes a boss. The boss is connected to the pole column flange and is located outside the receiving groove. The boss extends in the first direction away from the column body, and the boss is welded to the lead-out piece.

8. The cover plate assembly according to claim 7, wherein A relief groove is provided on the lead-out piece. The relief groove extends in the first direction, and the boss is provided in the relief groove.

9. The cover plate assembly according to claim 8, wherein, A notch is provided on the side surrounding surface. The notch penetrates the lead-out piece in the first direction to form the relief groove.

10. The cover plate assembly according to any one of claims 7-9, characterized in that, The boss includes a first boss and a second boss. The first boss and the second boss are oppositely arranged on the pole column flange, and the first boss and the second boss are welded to opposite sides of the lead-out piece in a second direction perpendicular to the first direction.

11. The cover plate assembly according to any one of claims 7-9, characterized in that The surface of the boss away from the cover plate is located between the first surface and the second surface in the first direction.

12. The cover plate assembly according to any one of claims 7-9, characterized in that, A step is provided on the lead-out piece. The step has a first connection surface and a second connection surface. The first connection surface is connected between the second connection surface and the second surface, and the second connection surface is located between the first surface and the second surface in the first direction; The surface of the boss away from the cover plate is coplanar with the second connection surface.

13. The cover plate assembly according to any one of claims 6-9, characterized in that, A plurality of pole columns are provided. A plurality of receiving grooves are arranged at intervals on the lead-out piece, and the plurality of pole columns and the plurality of receiving grooves are arranged in one-to-one correspondence.

14. The cover plate assembly according to any one of claims 6-9, characterized in that, It further includes a second insulating member and a conductive terminal. The conductive terminal, the second insulating member and the cover plate are stacked along the first direction; A second connection hole is provided on the second insulating member. The other end of the pole column sequentially passes through the first connection hole, the pole column through hole and the second connection hole and is connected to the conductive terminal.

15. The cover plate assembly according to claim 14, wherein, A first groove is provided on the cover plate, and the second insulating member is installed in the first groove; The second insulating member is provided with a second groove, and the conductive terminal is installed in the second groove.

16. The cover plate assembly according to any one of claims 6-9, characterized in that It further includes a sealing ring, and the sealing ring is sleeved on the outer peripheral side of the pole column; The sealing ring includes a first sealing ring and a second sealing ring. The second sealing ring is connected to one end of the first sealing ring away from the lead-out piece. The first sealing ring is arranged between the inner wall surface of the first connection hole and the outer surface of the pole column, and the second sealing ring is arranged between the inner wall surface of the through hole of the pole column and the outer surface of the pole column.

17. A battery, characterized in that, It includes the cover plate assembly according to any one of claims 5-16.

18. A battery pack, characterized in that, It includes the battery according to claim 17.

19. An electrical device, characterized in that, It includes the battery pack according to claim 18, or the battery according to claim 17.

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