Battery cover plate structure and battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cover plate structure and a battery, the battery cover plate structure comprises: a cover plate body provided with a first mounting hole; the first welding table comprises a welding plate body and a convex part; the welding plate body is arranged on one side of the first direction of the cover plate body and comprises a first face and a second face which are oppositely arranged in the first direction. The protruding part is recessed from the first face in the first direction and protrudes out of the second face, and the protruding part is suitable for being arranged in the first installation hole. The second welding table is arranged on the side, away from the first welding table, of the cover plate body, and insulating assemblies are arranged between the second welding table and the cover plate body and between the first welding table and the cover plate body for insulation; the second welding table is suitable for being welded with a tab; a second mounting hole is formed in the second welding table; and the connecting piece penetrates through the second mounting hole and is welded to the protruding part, and the connecting piece is suitable for fixedly connecting the second welding table with the first welding table. According to the battery cover plate structure provided by the utility model, the process yield of the cover plate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a battery cover plate structure and a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries, as power batteries, are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. The lithium battery cover plate is a core component for safety and assembly, and its structural design is crucial for the safety of the battery core. However, in the existing lithium battery cover plates, the pole column and the riveting block need to be riveted at the pole column position, resulting in a relatively low process yield. Content of the Utility Model

[0003] In view of this, the utility model provides a battery cover plate structure and a battery to solve the problem of relatively low process yield of the existing lithium battery cover plates.

[0004] In a first aspect, the utility model provides a battery cover plate structure, including:

[0005] A cover plate body, on which a first mounting hole is opened;

[0006] A first welding platform, including a welding plate body and a protruding part; the welding plate body is arranged on one side of the cover plate body in a first direction, the welding plate body includes a first surface and a second surface arranged opposite to each other along the first direction; the protruding part is recessed from the first surface along the first direction and protrudes from the second surface, and the protruding part is adapted to be placed inside the first mounting hole;

[0007] A second welding platform, arranged on the side of the cover plate body away from the first welding platform, and an insulating component is arranged between the second welding platform and the first welding platform and the cover plate body for insulation; the second welding platform is adapted to be welded with a tab; a second mounting hole is opened on the second welding platform;

[0008] A connecting piece, passing through the second mounting hole along the first direction and welded to the protruding part, and the connecting piece is adapted to fixedly connect the second welding platform and the first welding platform.

[0009] Beneficial effects: In the battery cover plate structure provided by the present utility model, by locally stamping a convex portion on the solder plate body, on the one hand, no machining is required, thereby improving the material utilization rate, achieving material cost reduction, and the first solder pad can be made of aluminum material with lower cost and lighter weight. Therefore, the setting of the convex portion can reduce the height of the pole column body, achieve pole column weight reduction and material cost reduction; on the other hand, when stamping, the convex portion is recessed from the first surface along the first direction and protrudes from the second surface, which can play a role in strengthening the structure on the solder plate body, improving the structural strength and stability of the first solder pad. There is a certain stress release when welding the tab, which can reduce the risk of thermal deformation of the first solder pad during tab welding, thereby improving the process yield; additionally, the convex portion is installed in the first mounting hole, which not only facilitates the positioning between the first solder pad and the cover plate body during cover plate assembly, ensuring the assembly accuracy, but also can improve the thrust level of the first solder pad in the direction perpendicular to the first direction, ensuring the overall structural strength of the cover plate, thereby improving the process yield.

[0010] In addition, by directly welding the second solder pad to the tab, no additional parts such as connecting pieces need to be provided between the second solder pad and the tab for connection, which can not only achieve structural cost reduction, but also facilitate maximizing the effective space inside the battery cell, thereby improving the volumetric energy density of the battery cell; the second solder pad and the first solder pad are independently arranged, and by setting a connecting piece to pass through the second mounting hole and perform penetration welding with the convex portion, the assembled fixed connection between the second solder pad and the first solder pad is realized, which is convenient for platform design and more conducive to meeting the requirements of batch cost reduction.

[0011] In an optional embodiment, the thickness of the convex portion is W, and W satisfies 1mm ≤ W ≤ 2mm.

[0012] Beneficial effects: By making the thickness W of the convex portion satisfy 1mm ≤ W ≤ 2mm, it can not only ensure sufficient structural strength of the convex portion to meet the welding strength requirements between the convex portion and the connecting piece, but also avoid the excessive thickness of the plate of the first solder pad, thereby reducing the material cost and reducing the weight of the battery cell.

[0013] In an optional embodiment, the solder plate body is recessed along the first direction from the first surface to form a sink, and the sink is arranged on the side of the convex portion away from the connecting piece along the first direction;

[0014] The depth of the sink is H, and H satisfies 1mm ≤ H ≤ 5mm.

[0015] Beneficial effects: Since the depth of the sunken groove is much greater than the depth of the welding mark, it will not affect the appearance of the cover plate and the assembly of the first welding platform surface and the bar piece, reducing the requirements for the welding process, facilitating better adjustment of the welding penetration depth and width between the protruding part and the connecting piece, and thus achieving a more stable structure. The depth H of the sunken groove satisfies 1 mm ≤ H ≤ 5 mm. On the one hand, it avoids affecting the assembly plane of the cover plate. On the other hand, it ensures the height of the protruding part, avoids increasing the height of the connecting piece, thereby reducing the weight and material cost of the connecting piece. On the third hand, it avoids increasing the difficulty and complexity of the stretching forming process, and at the same time avoids exceeding the material stretching limit of the welding plate body, effectively preventing serious wall thinning of the first welding platform, and thus ensuring the structural strength of the first welding platform.

[0016] In an optional embodiment, the second welding platform includes a first stepped portion, and the first stepped portion is arranged along the circumferential direction of the second mounting hole;

[0017] The connecting piece includes a cylindrical portion and a second stepped portion. The cylindrical portion is adapted to pass through the second mounting hole along the first direction and is penetration-welded to the protruding part. The second stepped portion is arranged at one end of the cylindrical portion away from the protruding part along the first direction, and the second stepped portion is adapted to abut against the first stepped portion along the first direction.

[0018] Beneficial effects: During assembly, the cylindrical portion passes through the second mounting hole and abuts against the protruding part. At the same time, the second stepped portion abuts against the first stepped portion along the first direction, and the protruding part and the cylindrical portion are penetration-welded, so as to fix the second welding platform to the first welding platform through the connecting piece, ensuring the stability of the cover plate structure.

[0019] In an optional embodiment, the insulating assembly includes a sealing ring, and the sealing ring is arranged between the protruding part, the connecting piece and the cover plate body. The sealing ring is adapted to seal and insulate between the protruding part, the connecting piece and the cover plate body;

[0020] One side of the second welding platform facing the cover plate body along the first direction abuts against the sealing ring, and the second welding platform is adapted to jointly limit and fix the sealing ring with the welding plate body.

[0021] Beneficial effects: One side of the second welding platform facing the cover plate body along the first direction is directly in contact and assembled with the sealing ring, and the protruding part and the cylindrical portion are penetration-welded, thus avoiding the risk of thermal deformation of the sealing ring caused by the direct welding of the second welding platform and the first welding platform, and further reducing the risk of poor sealing of the cover plate.

[0022] In an optional embodiment, the insulating assembly further includes a first insulating member, and the first insulating member is arranged between the second welding platform and the cover plate body. The first insulating member is adapted to insulate between the second welding platform and the cover plate body;

[0023] A receiving groove is provided on one side of the first insulating member facing the second welding platform along the first direction; the second welding platform is installed in the receiving groove.

[0024] Beneficial effects: On the one hand, it can perform initial positioning of the second soldering station and the first insulating part during the assembly process. On the other hand, it can reduce the space occupied by the second soldering station and the first insulating part, which is beneficial to maximizing the effective space inside the battery cell. On the third hand, it can reduce the weight and cost of the first insulating part.

[0025] In an alternative embodiment, the cover plate body protrudes away from the first insulating part in the first direction to form a limiting boss, and an explosion-proof hole is formed through the limiting boss;

[0026] The battery cover plate structure further includes an explosion-proof valve, which is arranged on the side of the limiting boss facing the first insulating part, and the explosion-proof valve closes the explosion-proof hole;

[0027] The battery cover plate structure further includes a fixing ring, which is arranged on the side of the explosion-proof valve away from the limiting boss along the first direction. The fixing ring is welded to the cover plate body, and the fixing ring is suitable for fixing the explosion-proof valve.

[0028] Beneficial effects: By welding the fixing ring to the cover plate body to fix the explosion-proof valve, it avoids directly welding the explosion-proof valve to the cover plate body, and reduces the risk of deformation and failure of the explosion-proof valve caused by the influence of welding heat.

[0029] In an alternative embodiment, the battery cover plate structure further includes a sealing gasket, which is wrapped around the circumferential edge of the explosion-proof valve. The sealing gasket is pressed and fixed by the fixing ring, and the sealing gasket is suitable for sealing between the explosion-proof valve and the cover plate body;

[0030] The sealing gasket is made of a heat-insulating material, and the sealing gasket is suitable for isolating the welding heat between the fixing ring and the cover plate body from the explosion-proof valve.

[0031] Beneficial effects: By wrapping the sealing gasket around the circumferential edge of the explosion-proof valve, the sealing gasket is made of a heat-insulating material, and the sealing gasket is pressed and fixed by the fixing ring during assembly. It can not only seal between the explosion-proof valve and the cover plate body through the sealing gasket, but also isolate the influence of welding heat on the explosion-proof valve through the sealing gasket, avoiding deformation and failure of the explosion-proof valve caused by poor welding.

[0032] In an alternative embodiment, the fixing ring includes a ring body and ribs connected to the inner circumferential wall of the ring body;

[0033] The ribs and the ring body jointly enclose an exhaust channel, and the exhaust channel is arranged opposite to the explosion-proof valve.

[0034] Beneficial effects: The fixing ring includes a ring body and ribs. The ring body is adapted to be welded to the cover plate body and press and fix the gasket. The ribs can enhance the structural strength of the fixing ring, thereby ensuring the structural stability of the fixing ring. The ribs and the ring body jointly enclose an exhaust passage, which is convenient for guiding the thermal runaway gas inside the battery cell to the explosion-proof valve to ensure the normal detonation and opening of the explosion-proof valve.

[0035] In a second aspect, the present utility model further provides a battery, including: a pole group, and the battery cover plate structure as described above;

[0036] A pole ear is provided on one side of the pole group facing the battery cover plate structure, and the pole ear is adapted to be welded to the second welding station.

[0037] Beneficial effects: The battery in the second aspect includes the battery cover plate structure in the first aspect. Therefore, the battery in the second aspect includes all the beneficial effects of the battery cover plate structure in the first aspect. Description of the drawings

[0038] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is an assembly drawing of a battery cover plate structure according to an embodiment of the present utility model;

[0040] Figure 2 It is a first exploded view of a battery cover plate structure according to an embodiment of the present utility model;

[0041] Figure 3 It is a second exploded view of a battery cover plate structure according to an embodiment of the present utility model;

[0042] Figure 4 It is for Figure 1 a cross-sectional view of the first welding station in

[0043] Figure 5 It is for Figure 1 a partial enlarged schematic view of part A in

[0044] Figure 6 It is for Figure 1 a cross-sectional view of the second welding station in

[0045] Figure 7 It is for Figure 1 a partial enlarged schematic view of part B in

[0046] Figure 8A perspective view of a battery cover structure according to an embodiment of the present utility model;

[0047] Figure 9 A perspective view of a fixing ring of a battery cover structure according to an embodiment of the present utility model.

[0048] Explanation of reference numerals:

[0049] 10. Cover body; 101. First mounting hole; 11. Limiting boss;

[0050] 20. First soldering platform; 21. Solder plate body; 211. First surface; 212. Second surface; 22. Protruding portion; 23. Sunk groove;

[0051] 30. Second soldering platform; 301. Second mounting hole; 31. First stepped portion;

[0052] 40. Insulating component; 41. Sealing ring; 42. First insulating member; 421. Accommodating groove; 43. Second insulating member;

[0053] 50. Connecting member; 51. Cylindrical portion; 52. Second stepped portion;

[0054] 60. Explosion-proof valve;

[0055] 70. Fixing ring; 701. Exhaust passage; 71. Ring body; 72. Rib;

[0056] 80. Sealing gasket. Detailed implementation manners

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0058] In the related art, at the position of the pole column, the cover plate needs to be riveted and pressed with the riveting block and the pole column, and problems such as poor riveting often occur. Moreover, the pole column is usually made of pure copper or aluminum copper. Not only is the material cost relatively high, but also the weight is relatively heavy. The pole column is integrally machined, which not only has a high processing cost but also is not conducive to automated production. When the bus bar is welded, excessive welding power often causes deformation of the riveting block of the flat structure and affects the sealing performance. The pole column body and the pole column bottom plate adopt a friction welding process, which has a potential risk of failure and is not easy to observe and identify, affecting the process yield. In addition, the lithium battery cover plate uses two parts, the pole column and the connecting piece, for welding, occupying a relatively large space. The explosion-proof valve is directly welded to the light aluminum sheet, and welding defects such as welding of the explosion-proof valve and welding around the shell cover may cause deformation, cracking and other defects of the explosion-proof valve.

[0059] Next, in conjunction with Figures 1 to 9 , embodiments of the present invention will be described.

[0060] According to an embodiment of the present invention, on the one hand, a battery cover plate structure is provided, including:

[0061] A cover plate body 10, please refer to Figure 2 and Figure 3 as shown. A first mounting hole 101 is formed therein;

[0062] A first welding platform 20, please refer to Figure 5 as shown. The first welding platform 20 includes a welding plate body 21 and a protruding portion 22; the welding plate body 21 is disposed on one side of the cover plate body 10 in a first direction. The protruding portion 22 is formed by local stamping of the welding plate body 21. Please refer to Figure 4 as shown together. The welding plate body 21 includes a first surface 211 and a second surface 212 that are oppositely disposed in the first direction; the protruding portion 22 is recessed from the first surface 211 in the first direction and protrudes from the second surface 212. The protruding portion 22 is adapted to be placed inside the first mounting hole 101;

[0063] A second welding platform 30 is disposed on a side of the cover plate body 10 away from the first welding platform 20. An insulating component 40 is provided between the second welding platform 30 and the first welding platform 20 and the cover plate body 10 for insulation; the second welding platform 30 is adapted to be welded to the tab. Please refer to Figure 6 as shown. A second mounting hole 301 is formed in the second welding platform 30;

[0064] A connecting member 50, please refer to Figure 5 as shown. The connecting member 50 passes through the second mounting hole 301 in the first direction and abuts against the protruding portion 22. The connecting member 50 is then welded to the protruding portion 22. The connecting member 50 is adapted to fixedly connect the second welding platform 30 and the first welding platform 20.

[0065] The battery cover plate structure provided by the present utility model forms a convex portion 22 by locally stamping on the solder plate body 21. On the one hand, machining is not required, thereby improving the material utilization rate, achieving material cost reduction, and the first solder pad 20 can be made of aluminum material with lower cost and lighter weight. Therefore, the setting of the convex portion 22 can reduce the height of the pole column body, achieve pole column weight reduction and material cost reduction; on the other hand, when stamping, the convex portion 22 is recessed from the first surface 211 along the first direction and protrudes from the second surface 212, which can play a role in strengthening the structure on the solder plate body 21, improving the structural strength and stability of the first solder pad 20. There is a certain stress release when welding the tab, which can reduce the risk of thermal deformation of the first solder pad 20 when welding the tab, thereby improving the process yield; additionally, the convex portion 22 is installed in the first mounting hole 101, which not only facilitates the positioning between the first solder pad 20 and the cover plate body 10 during cover plate assembly, ensuring the assembly accuracy, but also can improve the thrust level of the first solder pad 20 in the direction perpendicular to the first direction, ensuring the overall structural strength of the cover plate, thereby improving the process yield.

[0066] In addition, by directly welding the second solder pad 30 to the tab, no additional parts such as connecting pieces are required between the second solder pad 30 and the tab for connection, which can not only achieve structural cost reduction, but also is beneficial to maximizing the effective space inside the battery cell, thereby improving the volume energy density of the battery cell; the second solder pad 30 and the first solder pad 20 are independently arranged. By setting a connecting piece 50 to pass through the second mounting hole 301 and perform penetration welding with the convex portion 22, the assembled fixed connection between the second solder pad 30 and the first solder pad 20 is realized, which is convenient for adopting a platform design and is more conducive to meeting the requirements of batch cost reduction.

[0067] Furthermore, the first solder pad 20 can be made of aluminum material.

[0068] Furthermore, the connecting piece 50 can be made of pure copper material or aluminum - copper material.

[0069] In some embodiments, please refer to Figure 5 As shown, the thickness of the convex portion 22 is W, and W satisfies 1mm ≤ W ≤ 2mm.

[0070] It should be noted that if the thickness of the convex portion 22 is too thin, it is easy to cause insufficient structural strength of the convex portion 22 and cannot meet the welding strength requirements between the convex portion 22 and the connecting piece 50. Therefore, the thickness W of the convex portion 22 needs to satisfy W ≥ 1mm; since the convex portion 22 is locally stamped from the solder plate body 21, if the thickness of the convex portion 22 is too thick, the plate thickness of the first solder pad 20 needs to be increased, which not only easily leads to an increase in material cost, but also easily increases the weight of the battery cell. Therefore, the thickness of the convex portion 22 also needs to satisfy W ≤ 2mm.

[0071] In this embodiment, the thickness W of the convex portion 22 satisfies 1 mm ≤ W ≤ 2 mm, which can not only ensure sufficient structural strength of the convex portion 22 to meet the welding strength requirements between the convex portion 22 and the connecting member 50, but also avoid excessive thickness of the plate of the first welding platform 20, thereby reducing the material cost and the weight of the battery cell.

[0072] In some embodiments, please refer to Figure 4 and Figure 5 As shown, the solder plate body 21 is recessed from the first surface 211 along the first direction to form a sinking groove 23, and the sinking groove 23 is arranged on the side of the convex portion 22 away from the connecting member 50 along the first direction;

[0073] The depth of the sinking groove 23 is H, and H satisfies 1 mm ≤ H ≤ 5 mm.

[0074] Please refer to Figure 5 As shown, the solder plate body 21 forms the sinking groove 23 while stamping the convex portion 22, and penetration welding is performed between the convex portion 22 and the connecting member 50. Since the depth of the sinking groove 23 is much greater than the depth of the welding mark, it will not affect the appearance of the cover plate and the assembly of the surface of the first welding platform 20 and the bar piece, reduces the welding process requirements, and is convenient for better adjusting the welding penetration depth and width between the convex portion 22 and the connecting member 50, thereby achieving more stable structure.

[0075] It should be noted that since the convex portion 22 is locally stamped from the solder plate body 21, if the depth of the sinking groove 23 is too shallow, it will not only easily affect the assembly plane of the cover plate, but also easily cause the height of the convex portion 22 to decrease, resulting in an increase in the height of the connecting member 50, an increase in the weight of the connecting member 50, and affecting the cost reduction and weight reduction of the cover plate. Therefore, the depth H of the sinking groove 23 needs to satisfy H ≥ 1 mm; if the depth of the sinking groove 23 is too deep, it will not only easily increase the difficulty and complexity of the stretching forming process, but also easily exceed the material stretching limit of the solder plate body 21, resulting in serious wall change of the first welding platform 20 and affecting the structural strength of the first welding platform 20. Therefore, the depth H of the sinking groove 23 also needs to satisfy H ≤ 5 mm.

[0076] In this embodiment, the depth H of the sinking groove 23 satisfies 1 mm ≤ H ≤ 5 mm. On the one hand, it avoids affecting the assembly plane of the cover plate. On the other hand, it ensures the height of the convex portion 22, avoids an increase in the height of the connecting member 50, thereby reducing the weight and material cost of the connecting member 50. On the third hand, it avoids increasing the difficulty and complexity of the stretching forming process, and at the same time avoids exceeding the material stretching limit of the solder plate body 21, effectively preventing serious wall change of the first welding platform 20, thereby ensuring the structural strength of the first welding platform 20.

[0077] In some embodiments, please refer to Figure 6 As shown, the second welding platform 30 includes a first stepped portion 31, and the first stepped portion 31 is arranged along the circumference of the second mounting hole 301;

[0078] Please also combine with Figure 5 As shown, the connecting member 50 includes a cylindrical portion 51 and a second stepped portion 52. The cylindrical portion 51 is adapted to pass through the second mounting hole 301 along the first direction and penetrate-weld with the protruding portion 22. The second stepped portion 52 is disposed at one end of the cylindrical portion 51 away from the protruding portion 22 along the first direction, and the second stepped portion 52 is adapted to abut against the first stepped portion 31 along the first direction.

[0079] During assembly, the cylindrical portion 51 passes through the second mounting hole 301 and abuts against the protruding portion 22. At the same time, the second stepped portion 52 abuts against the first stepped portion 31 along the first direction, and the protruding portion 22 and the cylindrical portion 51 are penetration-welded, thereby fixing the second solder pad 30 and the first solder pad 20 through the connecting member 50, ensuring the stability of the cover structure.

[0080] In some embodiments, please refer to Figure 5 As shown, the insulating assembly 40 includes a sealing ring 41. The sealing ring 41 is disposed between the protruding portion 22, the connecting member 50 and the cover body 10. The sealing ring 41 is adapted to seal and insulate between the protruding portion 22, the connecting member 50 and the cover body 10;

[0081] One side of the second solder pad 30 facing the cover body 10 along the first direction abuts against the sealing ring 41, and the second solder pad 30 is adapted to jointly limit and fix the sealing ring 41 with the solder plate body 21.

[0082] In this embodiment, one side of the second solder pad 30 facing the cover body 10 along the first direction is directly in contact and assembled with the sealing ring 41. The protruding portion 22 and the cylindrical portion 51 are penetration-welded, thereby avoiding the risk of thermal deformation of the sealing ring 41 caused by the direct welding of the second solder pad 30 and the first solder pad 20, and further reducing the risk of poor sealing of the cover.

[0083] In some embodiments, please refer to Figure 5 As shown, the insulating assembly 40 further includes a first insulating member 42. The first insulating member 42 is disposed between the second solder pad 30 and the cover body 10, and the first insulating member 42 is adapted to insulate between the second solder pad 30 and the cover body 10;

[0084] Please also combine with Figure 3 As shown, a receiving groove 421 is provided on one side of the first insulating member 42 facing the second solder pad 30 along the first direction; the second solder pad 30 is installed in the receiving groove 421.

[0085] In this embodiment, a receiving groove 421 is provided on one side of the first insulating member 42 facing the second soldering station 30 along the first direction, so as to install the second soldering station 30 in the receiving groove 421. On the one hand, it can perform primary positioning of the second soldering station 30 and the first insulating member 42 during the assembly process. On the other hand, it can reduce the space occupied by the second soldering station 30 and the first insulating member 42, which is beneficial to maximizing the effective space inside the battery cell. On the third hand, it can reduce the weight and cost of the first insulating member 42.

[0086] Further, please refer to Figure 5 As shown, the insulating assembly 40 further includes a second insulating member 43. The second insulating member 43 is disposed between the solder plate body 21 and the cover plate body 10, and the second insulating member 43 is adapted to insulate between the solder plate body 21 and the cover plate body 10.

[0087] In some embodiments, please refer to Figure 7 As shown, a limiting boss 11 is formed by stamping on the cover plate body 10 along the first direction away from the first insulating member 42. The height of the limiting boss 11 does not occupy the internal space of the battery cell, and an explosion-proof hole is formed by opening on the limiting boss 11;

[0088] The battery cover structure further includes an explosion-proof valve 60. The explosion-proof valve 60 is disposed on the side of the limiting boss 11 facing the first insulating member 42, and the explosion-proof valve 60 closes the explosion-proof hole;

[0089] The battery cover structure further includes a fixing ring 70. The fixing ring 70 is disposed on the side of the explosion-proof valve 60 away from the limiting boss 11 along the first direction. The fixing ring 70 is welded to the cover plate body 10, and the fixing ring 70 is adapted to fix the explosion-proof valve 60.

[0090] In this embodiment, by providing a fixing ring 70 on the side of the explosion-proof valve 60 away from the limiting boss 11 along the first direction, and fixing the explosion-proof valve 60 by welding the fixing ring 70 to the cover plate body 10, the direct welding of the explosion-proof valve 60 and the cover plate body 10 is avoided, and the risk of deformation and failure of the explosion-proof valve 60 caused by the welding heat effect is reduced.

[0091] In some embodiments, please refer to Figure 7 As shown, the battery cover structure further includes a sealing gasket 80. The sealing gasket 80 is wrapped around the circumferential edge of the explosion-proof valve 60. The sealing gasket 80 is pressed and fixed by the fixing ring 70, and the sealing gasket 80 is adapted to seal between the explosion-proof valve 60 and the cover plate body 10;

[0092] The sealing gasket 80 is made of a heat-insulating material, and the sealing gasket 80 is adapted to isolate the welding heat of the fixing ring 70 and the cover plate body 10 from the explosion-proof valve 60.

[0093] In this embodiment, by wrapping a gasket 80 around the circumferential edge of the explosion-proof valve 60, the gasket 80 is made of a heat-insulating material, and the gasket 80 is pressed and fixed by a fixing ring 70 during assembly. It can not only seal between the explosion-proof valve 60 and the cover body 10 through the gasket 80, but also isolate the influence of welding heat on the explosion-proof valve 60 through the gasket 80, avoiding deformation and failure of the explosion-proof valve caused by poor welding.

[0094] Further, the gasket 80 can be made of fluororubber.

[0095] In some embodiments, please also refer to Figure 7 and Figure 9 As shown, the fixing ring 70 includes a ring body 71 and ribs 72 connected to the inner circumferential wall of the ring body 71;

[0096] The ribs 72 and the ring body 71 together enclose an exhaust passage 701, and the exhaust passage 701 is disposed opposite to the explosion-proof valve 60.

[0097] In this embodiment, the fixing ring 70 includes a ring body 71 and ribs 72. The ring body 71 is adapted to be welded to the cover body 10 and press and fix the gasket 80. The ribs 72 can enhance the structural strength of the fixing ring 70, thereby ensuring the structural stability of the fixing ring 70; the ribs 72 and the ring body 71 together enclose an exhaust passage 701, which is convenient for guiding the thermal runaway gas inside the battery cell to the explosion-proof valve 60 to ensure the normal detonation and opening of the explosion-proof valve 60.

[0098] Further, an exhaust through-hole (not shown in the figure) is provided on the first insulating member 42, and the exhaust through-hole is communicated with the exhaust passage 701.

[0099] According to an embodiment of the present invention, on the other hand, a battery is also provided, including: a pole group, and the battery cover structure as described above;

[0100] A pole ear is provided on one side of the pole group facing the battery cover structure, and the pole ear is adapted to be welded to the second soldering station 30.

[0101] The battery in this embodiment includes the above battery cover structure. Therefore, the battery in this embodiment includes all the beneficial effects of the above battery cover structure.

[0102] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover plate structure, characterized in that, Comprising: A cover plate body, on which a first mounting hole is provided; A first soldering station, including a soldering plate body and a protruding portion; the soldering plate body is disposed on one side of the cover plate body in a first direction, the soldering plate body includes a first surface and a second surface oppositely disposed along the first direction; the protruding portion is recessed from the first surface along the first direction and protrudes from the second surface, and the protruding portion is adapted to be disposed inside the first mounting hole; A second soldering station, disposed on a side of the cover plate body away from the first soldering station, and an insulating component is provided between the second soldering station and the first soldering station and the cover plate body for insulation; the second soldering station is adapted to be welded to a tab; a second mounting hole is provided on the second soldering station; A connecting member, passing through the second mounting hole along the first direction and welded to the protruding portion, and the connecting member is adapted to fixedly connect the second soldering station and the first soldering station.

2. The battery cover plate structure according to claim 1, characterized in that, The thickness of the protruding portion is W, and W satisfies 1 mm ≤ W ≤ 2 mm.

3. The battery cover plate structure according to claim 1, wherein, The soldering plate body is recessed from the first surface along the first direction to form a sinking groove, and the sinking groove is disposed on a side of the protruding portion away from the connecting member along the first direction; The depth of the sinking groove is H, and H satisfies 1 mm ≤ H ≤ 5 mm.

4. The battery cover plate structure according to claim 1, characterized in that, The second soldering station includes a first step portion, and the first step portion is disposed along the circumference of the second mounting hole; The connecting member includes a columnar portion and a second step portion, the columnar portion is adapted to pass through the second mounting hole along the first direction and penetrate and weld with the protruding portion, the second step portion is disposed at one end of the columnar portion away from the protruding portion along the first direction, and the second step portion is adapted to abut against the first step portion along the first direction.

5. The battery cover plate structure according to claim 1, characterized in that, The insulating component includes a sealing ring, and the sealing ring is disposed between the protruding portion and the connecting member and the cover plate body, and the sealing ring is adapted to seal and insulate between the protruding portion and the connecting member and the cover plate body; One side of the second soldering station facing the cover plate body along the first direction abuts against the sealing ring, and the second soldering station is adapted to jointly limit and fix the sealing ring with the soldering plate body.

6. The battery cover plate structure according to claim 1, characterized in that The insulating component further includes a first insulating member, and the first insulating member is disposed between the second soldering station and the cover plate body, and the first insulating member is adapted to insulate between the second soldering station and the cover plate body; A receiving groove is provided on one side of the first insulating member facing the second soldering station along the first direction; the second soldering station is installed in the receiving groove.

7. The battery cover plate structure according to claim 6, characterized in that, The cover plate body protrudes along the first direction toward a direction away from the first insulating member to form a limiting boss, and an explosion-proof hole is formed by opening on the limiting boss; The battery cover plate structure further includes an explosion-proof valve, and the explosion-proof valve is disposed on a side of the limiting boss facing the first insulating member, and the explosion-proof valve closes the explosion-proof hole; The battery cover plate structure further includes a fixing ring, and the fixing ring is disposed on a side of the explosion-proof valve away from the limiting boss along the first direction, and the fixing ring is welded to the cover plate body, and the fixing ring is adapted to fix the explosion-proof valve.

8. The battery cover plate structure according to claim 7, characterized in that, The battery cover plate structure further includes a sealing gasket, the sealing gasket is wrapped around the circumferential edge of the explosion-proof valve, the sealing gasket is pressed and fixed by the fixing ring, and the sealing gasket is adapted to seal between the explosion-proof valve and the cover plate body; The sealing gasket is made of a heat-insulating material, and the sealing gasket is adapted to isolate the welding heat between the fixing ring and the cover plate body from the explosion-proof valve.

9. The battery cover plate structure according to claim 7, wherein, The fixing ring includes a ring body and ribs connected to the inner circumferential wall of the ring body; The ribs and the ring body together enclose an exhaust passage, and the exhaust passage is disposed opposite to the explosion-proof valve.

10. A battery, characterized in that, Comprising: a pole group, and the battery cover plate structure according to any one of claims 1 to 9 above; A pole ear is provided on one side of the pole group facing the battery cover plate structure, and the pole ear is adapted to be welded to the second soldering station.

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