Top cover assembly, battery and electric equipment

Abstract

The invention provides a top cover assembly, a battery and electric equipment, the top cover assembly comprises a cover body, a pole, a welding ring, a sealing piece and an upper plastic ring, the cover body is provided with a first mounting hole in a penetrating manner along a first direction, the pole is partially arranged in the first mounting hole, and the pole is provided with a first end face arranged away from the first mounting hole; the welding ring surrounds the peripheral side of the pole and comprises an annular main body and a limiting ring which are connected, the annular main body is connected with the cover body, the limiting ring is opposite to the first end face in the first direction and is arranged in a spaced mode, the sealing piece is clamped between the welding ring and the pole, the sealing piece wraps the side portion of the pole, and the sealing piece comprises an abutting end portion adjacent to the first end face; the upper plastic ring comprises a sleeving ring and a crimping ring which are sequentially connected, the sleeving ring is suitable for being arranged on the outer side of the annular main body in a sleeving mode, the crimping ring is connected with the limiting ring, and part of the crimping ring and / or the abutting end are / is clamped between the first end face and the limiting ring, so that the sealing performance of the top cover assembly is improved.

Description

Technical Field

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

[0002] The battery generally includes a battery cell, a shell that accommodates the battery cell, a top cover assembly sealed and mounted on the shell, and an electrolyte poured into the shell. Among them, the top cover assembly has a significant impact on the safety of the battery. Since the top cover assembly is used to seal the shell, the top cover assembly needs to have good sealing properties to prevent air moisture and the like from entering the interior of the shell, and to prevent the electrolyte in the shell from leaking. In the related art, the top cover assembly is usually provided with a sealing ring, which is clamped between the welding ring and the side wall of the pole, so that the pole and the welding ring only form a sealing barrier at the connection between the side walls of the pole, which results in poor sealing of the top cover assembly. Summary of the invention

[0003] The embodiments of the present invention provide a top cover assembly, a battery and an electric device, aiming to improve the sealing performance of the top cover assembly.

[0004] In a first aspect, an embodiment of the present invention provides a top cover assembly.

[0005] In one embodiment, the top cover assembly includes:

[0006] The cover body is provided with a first mounting hole extending through the cover body along a first direction;

[0007] A pole, partially disposed in the first mounting hole, the pole having a first end surface disposed away from the first mounting hole;

[0008] a welding ring, arranged around the circumference of the pole, comprising an annular body and a limiting ring which are connected and arranged, wherein the annular body is connected to the cover body, and the limiting ring is arranged opposite to the first end face and spaced apart along the first direction;

[0009] A sealing member, sandwiched between the welding ring and the pole, the sealing member wraps around the side of the pole, and the sealing member includes an abutting end portion adjacent to the first end surface;

[0010] The upper plastic ring comprises a sleeve ring and a crimping ring which are sequentially connected and arranged, wherein the sleeve ring is suitable for being sleeved on the outer side of the annular body, and the crimping ring is connected to the limiting ring;

[0011] Part of the crimping ring and / or the abutting end portion is sandwiched between the first end surface and the limiting ring.

[0012] In one embodiment, parts of the crimping ring are in sealing contact with the abutting end portion and the first end surface, respectively.

[0013] In one embodiment, the crimping ring abuts against the first end surface, and along the first direction, the thickness of the crimping ring is H1, wherein 0.8 mm≤H1≤5 mm.

[0014] In one embodiment, the limiting ring has a limiting hole, and the axis of the limiting hole is extended along the first direction;

[0015] The crimping ring includes a first insulating section and a second insulating section, the first insulating section is sleeved on the limiting ring, the second insulating section abuts against the inner wall of the limiting hole, one end of the second insulating section is connected to the first insulating section, and the other end of the second insulating section abuts against the first end face.

[0016] In one embodiment, along the first direction, the thickness of the first insulating segment is H2, wherein 0.2 mm≤H2<4.8 mm.

[0017] In one embodiment, the second insulating section has a through hole, the axis of the through hole extends along the first direction, and the inner side wall of the through hole is gradually contracted inwardly toward the axis of the through hole in a direction toward the first mounting hole.

[0018] In one embodiment, the second insulating section comprises:

[0019] An insulating body, abutting against the inner side wall of the limiting hole and forming the through hole;

[0020] The insulating platform is convexly arranged on a side of the insulating body away from the penetration hole, and a clamping groove is formed between the insulating platform, the insulating body and the first insulating section, and the limiting ring is clamped in the clamping groove.

[0021] In one embodiment, the thickness of the insulating platform is H3, wherein 0.2 mm ≤ H3 < 4.8 mm.

[0022] In one embodiment, one end of the sleeve ring away from the crimping ring is in sealing contact with the cover body.

[0023] In one embodiment, the thickness of the pole is H1, wherein 2mm≤H1≤5mm.

[0024] In one embodiment, two poles are provided, and one of the two poles includes a first metal layer and a second metal layer arranged in sequence along the first direction, the first metal layer is arranged away from the limiting ring, and along the first direction, the thickness of the first metal layer is H4, and the thickness of the second metal layer is H5, wherein 0.5mm≤H4≤3.5mm; and / or, 1.5mm≤H5≤4.5mm.

[0025] In one embodiment, the annular main body portion is located in the first mounting hole and is fixed to the cover body by welding.

[0026] In one embodiment, a mounting groove is provided on a side of the cover body away from the limiting ring, and the first mounting hole is provided through the bottom of the mounting groove;

[0027] The annular body includes an annular seat and an annular wall extending along the first direction, the annular seat is installed in the installation groove, one end of the annular wall is connected to the annular seat, and the other end of the annular wall extends out of the first installation hole and is connected to the limiting ring.

[0028] In one embodiment, it further includes a lower plastic, wherein the lower plastic includes:

[0029] A straight portion, the straight portion is arranged on a side of the cover body away from the limiting ring and is in contact with the cover body and the annular seat, the straight portion is provided with a connecting hole penetrating along the first direction, and the connecting hole is connected with the first mounting hole;

[0030] A sleeve is arranged around the communicating hole, one end of the sleeve is connected to the straight portion, and the other end of the sleeve is suitable for extending into the through hole to abut against the pole.

[0031] In one embodiment, the seal includes a first sealing ring segment, a second sealing ring segment, a third sealing ring segment and a fourth sealing ring segment connected in sequence, the first sealing ring segment is clamped between the limiting ring and the first end face, the second sealing ring segment is clamped between the ring wall and the side wall of the pole, the third sealing ring segment is clamped between the annular seat and the pole, and the fourth sealing ring segment is clamped between the sleeve and the annular seat.

[0032] In a second aspect, the present application also provides a battery, comprising a top cover assembly as described above.

[0033] In a third aspect, the present application also provides an electrical device, wherein the electrical device comprises the battery as described above.

[0034] Beneficial effects of the embodiments of the present invention:

[0035] In an embodiment of the present invention, the cover body is provided with a first mounting hole through the first direction, and the setting of the first mounting hole provides a mounting position for the installation of the pole. By arranging the pole part in the first mounting hole, a more compact design of the top cover assembly can be achieved, reducing the space occupied by the pole, thereby improving the overall space utilization of the battery or electrical equipment. The seal is cleverly sandwiched between the welding ring and the pole, and wraps the side of the pole, effectively preventing external liquid or gas from penetrating into the interior through the gap between the pole and the cover body. The abutting end of the seal is adjacent to the first end face of the pole, further enhancing the sealing effect and reducing the risk of leakage caused by the end face gap. The crimping ring is connected to the limiting ring, and part of the crimping ring and / or the abutting end are sandwiched between the first end face and the limiting ring. In this way, on the one hand, the limiting installation of the pole is achieved to prevent the pole from falling off from the first mounting hole. On the other hand, the crimping ring part and / or the abutting end portion form a tight sealing barrier between the first end face and the limiting ring, which can effectively prevent external fluid or impurities from entering the gap between the welding ring and the pole, thereby improving the sealing performance of the top cover assembly. The crimping ring and / or the abutting end portion not only play a sealing role, but also can form an insulating barrier between the welding ring and the pole, isolating the electrical connection between the welding ring and the pole to a certain extent, thereby reducing electrical failures, thereby improving the safety of electrical equipment with the top cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic structural diagram of a top cover assembly provided by an embodiment of the present invention;

[0038] Figure 2 yes Figure 1 An exploded schematic diagram of the top cover assembly shown;

[0039] Figure 3 yes Figure 1 A schematic cross-sectional view of the top cover assembly (from one perspective);

[0040] Figure 4 yes Figure 1 A schematic cross-sectional view of the top cover assembly (from another perspective);

[0041] Figure 5 yes Figure 1 A schematic cross-sectional view of the upper middle plastic ring;

[0042] Figure 6yes Figure 1 Schematic diagram of the structure of the welding ring.

[0043] Description of reference numerals:

[0044] 10. Top cover assembly; 1. Cover body; 11. First mounting hole; 12. Mounting groove; 13. Second mounting hole; 2. Pole; 21. First end face; 22. First metal layer; 23. Second metal layer; 3. Welding ring; 31. Ring body; 311. Ring seat; 312. Ring wall; 32. Limiting ring; 321. Limiting hole; 4. Sealing member; 41. Abutting end; 42. First sealing ring segment; 43. The second sealing ring segment; 44, the third sealing ring segment; 45, the fourth sealing ring segment; 5, the upper plastic ring; 51, the sleeve ring; 52, the crimping ring; 521, the first insulating segment; 522, the second insulating segment; 5221, the penetration hole; 5223, the insulating body; 5224, the insulating platform; 5225, the slot; 6, the lower plastic; 61, the straight portion; 62, the sleeve; 7, the explosion-proof valve; 8, the protective sheet; 9, the connecting sheet. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0046] The battery generally includes a battery cell, a shell that accommodates the battery cell, a top cover assembly sealed and mounted on the shell, and an electrolyte poured into the shell. Among them, the top cover assembly has a significant impact on the safety of the battery. Since the top cover assembly is used to seal the shell, the top cover assembly needs to have good sealing properties to prevent air moisture and the like from entering the interior of the shell, and to prevent the electrolyte in the shell from leaking. In the related art, the top cover assembly is usually provided with a sealing ring, which is clamped between the welding ring and the side wall of the pole, so that the pole and the welding ring only form a sealing barrier at the connection between the side walls of the pole, which results in poor sealing of the top cover assembly.

[0047] In view of this, the present invention proposes a top cover assembly. Figures 1 to 6The top cover assembly provided by the present invention has a high sealing performance. The top cover assembly will be described in detail below in conjunction with the main drawings.

[0048] Reference Figures 1 to 4 The top cover assembly 10 includes a cover body 1, a pole 2, a welding ring 3, a sealing member 4 and an upper plastic ring 5. The cover body 1 is provided with a first mounting hole 11 along a first direction. The pole 2 is partially provided in the first mounting hole 11. The pole 2 has a first end face 21 which is provided away from the first mounting hole 11. The welding ring 3 is provided around the circumference of the pole 2, and includes an annular body 31 and a limiting ring 32 which are connected. The annular body 31 is connected to the cover body 1. The limiting ring 32 is connected to the first end face 21 along the first direction. The sealing member 4 is sandwiched between the welding ring 3 and the pole 2, and the sealing member 4 is arranged to wrap the side of the pole 2. The sealing member 4 includes an abutting end portion 41 adjacent to the first end face 21; the upper plastic ring 5 includes a sleeve ring 51 and a crimping ring 52 which are sequentially connected, the sleeve ring 51 is suitable for being sleeved on the outer side of the annular body 31, and the crimping ring 52 is connected to the limiting ring 32, wherein part of the crimping ring 52 and / or the abutting end portion 41 is sandwiched between the first end face 21 and the limiting ring 32.

[0049] In an embodiment of the present invention, the cover body 1 is provided with a first mounting hole 11 along the first direction, and the setting of the first mounting hole 11 provides a mounting position for the installation of the pole 2. By partially arranging the pole 2 in the first mounting hole 11, a more compact design of the top cover assembly 10 can be achieved, and the space occupied by the pole 2 can be reduced, thereby improving the overall space utilization of the battery or electrical equipment. The seal 4 is cleverly sandwiched between the welding ring 3 and the pole 2, and wraps the side of the pole 2, effectively preventing external liquid or gas from penetrating into the interior through the gap between the pole 2 and the cover body 1. The abutting end 41 of the seal 4 abuts the first end face 21 of the pole 2, further enhancing the sealing effect and reducing the risk of leakage caused by the end face gap. The crimping ring 52 is connected to the limiting ring 32, and a part of the crimping ring 52 and / or the abutting end 41 are sandwiched between the first end face 21 and the limiting ring 32. In this way, on the one hand, the limiting installation of the pole 2 is achieved to prevent the pole 2 from falling off from the first mounting hole 11. On the other hand, the crimping ring 52 and / or the abutting end 41 form a tight sealing barrier between the first end face 21 and the limiting ring 32, which can effectively prevent external fluids or impurities from entering the gap between the welding ring 3 and the pole 2, thereby improving the sealing performance of the top cover assembly 10. The crimping ring 52 and / or the abutting end 41 not only play a sealing role, but also can form an insulating barrier between the welding ring 3 and the pole 2, isolating the electrical connection between the welding ring 3 and the pole 2 to a certain extent, thereby reducing electrical failures, thereby improving the safety of electrical equipment with the top cover assembly 10.

[0050] In one embodiment, portions of the crimping ring 52 are sealed against the abutment end 41 and the first end face 21, respectively. In this way, a seal is formed between the crimping ring 52 and the abutment end 41 and between the crimping ring 52 and the first end face 21. This double sealing design can improve the sealing performance of the top cover assembly 10. On the other hand, the pole 2 and the welding ring 3 are completely insulated and separated by the crimping ring 52 and the abutment end 41, avoiding electrical connection between the pole 2 and the welding ring 3, thereby improving the safety of the battery with the top cover assembly 10. On the other hand, portions of the crimping ring 52 are sealed against the abutment end 41 and the first end face 21, respectively, so that the pole 2 is stably installed, avoiding shaking of the pole 2, and ensuring that the battery with the top cover assembly 10 can work normally.

[0051] In one embodiment, the crimping ring 52 abuts against the first end face 21, and the thickness of the crimping ring 52 along the first direction is H1, wherein 0.8 mm ≤ H1 ≤ 5 mm, and the thickness H1 of the crimping ring 52 is between 0.8 mm and 5 mm. This range not only ensures that the crimping ring 52 has enough material to form a tight seal, but also avoids installation difficulties or material waste caused by excessive thickness. Such a design can ensure a good sealing effect between the crimping ring 52 and the first end face 21. The thickness H1 of the crimping ring 52 is between 0.8 mm and 5 mm, which ensures that the crimping ring 52 can effectively limit the pole 2. The thickness H1 of the crimping ring 52 is between 0.8 mm and 5 mm, which can make it have a certain pressure resistance. When the top cover assembly 10 is subjected to external pressure, the crimping ring 52 can absorb part of the pressure, thereby protecting the pole 2 from damage. The thickness H1 of the crimping ring 52 is between 0.8 mm and 5 mm, which helps to improve the durability of the crimping ring 52. Even if it is worn or corroded during use, the crimping ring 52 can maintain a certain thickness and sealing performance, thereby extending the service life of the top cover assembly 10. The thickness H1 of the crimping ring 52 is between 0.8 mm and 5 mm, which can also improve the voltage resistance performance of the top cover, so that the battery with the top cover assembly 10 has high stability and is suitable for high-voltage platforms, and the insulation level of the crimping ring 52 is excellent and is not easy to fail under extreme conditions.

[0052] It should be noted that, along the first direction, the thickness of the crimping ring 52 can be 0.8 mm, 0.9 mm, 1 mm, 1.4 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.4 mm, 3.9 mm, 4 mm, 4.3 mm, 4.8 mm or 5 mm, etc. Specifically, the thickness of the crimping ring 52 can be selected as needed, and the present application does not limit this.

[0053] In one embodiment, the limiting ring 32 has a limiting hole 321, the axis of the limiting hole 321 extends along the first direction, and the crimping ring 52 includes a first insulating section 521 and a second insulating section 522. The first insulating section 521 is sleeved on the limiting ring 32, so that the limiting ring 32 is protected and the limiting ring 32 is prevented from being exposed to the risk of rust and damage for a long time, so that the limiting ring 32 can always apply pressure to the abutting end 41 and / or the crimping ring 52. In addition, since the pole 2 is to be electrically connected to the bar piece later, the first insulating section 521 is sleeved outside the limiting ring 32, so that the bar piece and the limiting ring 32 can be electrically isolated, effectively preventing the electrical contact between the bar piece and the limiting ring 32, avoiding possible electrical interference or short circuit problems, and ensuring that the battery with the top cover assembly 10 can work normally. The second insulating section 522 abuts against the inner side wall of the limiting hole 321, so that the second insulating section 522 is stably installed. One end of the second insulating segment 522 is connected to the first insulating segment 521, and the other end of the second insulating segment 522 is in contact with the first end surface 21. In this way, on the one hand, the pole 2 is limitedly installed to prevent the pole 2 from detaching from or shaking from the first mounting hole 11, and on the other hand, the sealing performance of the top cover assembly 10 is improved.

[0054] In one embodiment, along the first direction, the thickness of the first insulating segment 521 is H2, wherein 0.2 mm ≤ H2 < 4.8 mm. Thus, the thickness of the first insulating segment 521 is between 0.2 mm and 4.8 mm, which can effectively prevent the current from flowing between the bar piece and the limiting ring 32, thereby avoiding the occurrence of electrical short circuit or interference, and can also reduce the electrical coupling between the bar piece and the limiting ring 32, thereby reducing the mutual influence between them. The thickness of the first insulating segment 521 is between 0.2 mm and 4.8 mm, which can ensure the electrical isolation effect while avoiding excessive use of materials. When the thickness of the first insulating segment 521 is less than 0.2 mm, it will not be able to effectively electrically isolate the limiting ring 32 and the bar piece, and the first insulating segment 521 is prone to damage and failure after long-term use. The thickness of the first insulating segment 521 is greater than 4.8 mm, which will increase the material cost and may bring additional installation and maintenance difficulties.

[0055] It should be noted that electrical coupling refers to the phenomenon of interaction between two or more circuit elements through electric fields or magnetic fields. In addition, the thickness of the first insulating segment 521 can be 0.2 mm, 0.4 mm, 0.7 mm, 0.9 mm, 1 mm, 1.4 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.4 mm, 3.9 mm, 4 mm, 4.3 mm or 4.8 mm, etc. Specifically, the thickness of the first insulating segment 521 can be selected as needed, and this application does not limit this.

[0056] In one embodiment, the second insulating section 522 has a through hole 5221, the axis of the through hole 5221 extends along the first direction, and the inner side wall of the through hole 5221 is gradually reduced in the direction of the axis of the through hole 5221 in the direction toward the first mounting hole 11, so that the design of the gradually reduced through hole 5221 provides a guide for the tab to pass through the through hole 5221 and be electrically connected to the pole 2, making it easy to insert the tab into the through hole 5221 and be electrically connected to the pole 2. The area of ​​the cross section of the gradually reduced inner side wall adjacent to the first end face 21 in the first direction is larger than the area of ​​the cross section away from the first end face 21, thereby increasing the contact area between the inner side wall and the first end face 21, improving the sealing effect of the second insulating section 522 and the effect of pressing the pole 2, and preventing the sealing failure or damage caused by the shaking or vibration of the components.

[0057] In one embodiment, the second insulating section 522 includes an insulating body 5223 and an insulating platform 5224, and the insulating body 5223 abuts against the inner side wall of the limiting hole 321, so that the insulating body 5223 is stably installed. The insulating platform 5224 is convexly arranged on the side of the insulating body away from the through hole 5221, and a clamping groove 5225 is formed between the insulating platform 5224, the insulating body 5223 and the first insulating section 521. Since the welding ring 3 is connected to the cover body 1, the position of the welding ring 3 is fixed. Since the limiting ring 32 is a part of the welding ring 3, the limiting ring 32 is clamped in the clamping groove 5225, so that the position of the upper plastic ring 5 is fixed, and it is only necessary to fix the welding ring 3 to the cover body 1 to achieve the fixing of the upper plastic ring 5, the pole 2 and the sealing ring on the cover body 1, so that the assembly of the top cover assembly 10 is simpler and more convenient, easy to implement, and greatly improves the production efficiency.

[0058] In one embodiment, the thickness of the insulating platform 5224 is H3, wherein 0.2 mm ≤ H3 < 4.8 mm, so that electrical isolation between the pole 2 and the limiting ring 32 is achieved, thereby avoiding the risk of short circuit safety hazards of the battery with the top cover. When the thickness of the insulating platform 5224 is less than 0.2 mm, the limiting ring 32 and the pole 2 cannot be effectively electrically isolated, and the insulating platform 5224 is prone to damage and failure after long-term use. When the thickness of the insulating platform 5224 is greater than 4.8 mm, although the limiting ring 32 and the pole 2 can be electrically isolated, the production cost will increase.

[0059] It should be noted that the thickness of the insulating platform 5224 can be 0.2mm, 0.4mm, 0.7mm, 0.9mm, 1mm, 1.4mm, 1.8mm, 2mm, 2.5mm, 3mm, 3.4mm, 3.9mm, 4mm, 4.3mm or 4.8mm, etc. Specifically, the thickness of the insulating platform 5224 can be selected as needed, and this application does not limit this.

[0060] In one embodiment, one end of the sleeve ring 51 away from the crimping ring 52 is in sealing contact with the cover body 1 , thereby preventing fluid or gas from penetrating from the first mounting hole 11 , thereby improving the sealing performance of the top cover assembly 10 .

[0061] The material of the upper plastic ring 5 can be selected as needed. For example, the material of the lower upper plastic ring 5 can include insulating materials, such as at least one of plastic, rubber and ceramic materials. Of course, in other embodiments, the material of the upper plastic ring 5 can also include semi-insulating plastic. Specifically, the material of the upper plastic ring 5 can be selected as needed, and this application does not limit this.

[0062] In one embodiment, the thickness of the pole 2 is H1, wherein 2mm≤H1≤5mm. Thus, the thickness H1 of the pole 2 is within the range of 2mm to 5mm. This design helps to optimize the transmission path of the current, reduce the obstacles to the current during the transmission process, and enable the current to pass more smoothly. The thickness H1 of the pole 2 within the range of 2mm to 5mm helps to reduce the resistance. The reduction in resistance means that when the same current is transmitted, the power consumption will be reduced, thereby improving the energy efficiency of the battery. The thickness H1 of the pole 2 within the range of 2mm to 5mm helps to dissipate heat, because the heat can be transferred to the surrounding environment more quickly through a larger surface area, which helps to avoid overheating of the pole 2 when transmitting a large current, thereby protecting the safety of the circuit and the equipment. The thickness H1 of the pole 2 within the range of 2mm to 5mm ensures the strength of the pole 2 while enabling a larger current to be transmitted under the same conditions. When the thickness of the pole 2 is less than 2mm, although the current carrying capacity of the pole 2 is improved, the strength of the pole 2 is insufficient, resulting in the easy deformation of the pole 2. When the thickness of the pole 2 is greater than 5 mm, although the strength of the pole 2 can be ensured, the current carrying capacity of the pole 2 is reduced.

[0063] It should be noted that the thickness of the pole 2 can be 2mm, 2.4mm, 2.7mm, 2.9mm, 3mm, 3.4mm, 3.8mm, 4mm, 4.5mm, 4.8mm, 4.9mm or 5mm, etc. Specifically, the thickness of the pole 2 can be selected as needed, and the present application does not limit this.

[0064] In one embodiment, two poles 2 are provided, and one of the two poles 2 includes a first metal layer 22 and a second metal layer 23 sequentially arranged along a first direction, and the first metal layer 22 is arranged away from the limiting ring 32, and materials with different conductive properties can be selected as needed. For example, the first metal layer 22 can select a material with high conductivity, such as copper or silver, to optimize current transmission. The second metal layer 23 can select a material with other characteristics (such as corrosion resistance, high strength, etc.) to meet the specific application requirements of the pole 2. This design can improve the performance of the battery cell. Along the first direction, the thickness of the first metal layer 22 is H4, and the thickness of the second metal layer is H5, wherein 0.5mm≤H4≤3.5mm; and / or, 1.5mm≤H5≤4.5mm, so that it helps to ensure that the pole 2 has good conductive properties while maintaining sufficient mechanical strength, so as to save production costs while ensuring that the pole 2 has good current capacity. In addition, in actual operation, since the first metal layer 22 needs to be welded to the connecting piece 9, the thickness of the first metal layer 22 is in the range of 0.5 mm to 3.5 mm to prevent the risk of welding through the first metal layer 22. In addition, the layered design can also reduce the thermal stress caused by temperature changes. When the pole 2 is affected by temperature changes, the difference in thermal expansion coefficients between different metal layers will cause thermal stress. Through the layered design, these stresses can be dispersed more effectively, thereby protecting the pole 2 from damage.

[0065] It should be noted that the thickness of the first metal layer 22 can be 0.5mm, 0.7mm, 0.9mm, 1mm, 1.4mm, 1.8mm, 2mm, 2.5mm, 3mm, 3.4mm or 3.5mm, etc. Specifically, the thickness of the first metal layer 22 can be selected as needed, and the present application does not limit this. In addition, the thickness of the second metal layer 23 can be 1.5mm, 1.7mm, 1.9mm, 2mm, 2.4mm, 2.8mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.3mm or 4.5mm, etc. Specifically, the thickness of the second metal layer 23 can be selected as needed, and the present application does not limit this.

[0066] In addition, the pole 2 is made by an integrated composite plate molding process. The shape of the boundary line between the first metal layer and the second metal layer is formed by the natural flow during the metal molding process. The boundary line fits the appearance of the pole 2. The bonding interface of the pole 2 is a physical bond, and there are pores at the microscopic level, and two metal materials may exist simultaneously on a horizontal plane.

[0067] Specifically, the material of the second metal layer 23 may include aluminum, aluminum alloy, magnesium or magnesium alloy. Of course, in other embodiments, the material of the second metal layer 23 may be selected as needed, and the present application does not limit this. The material of the first metal layer 22 includes copper or copper alloy. Of course, in other embodiments, the material of the first metal layer 22 may be selected as needed, and the present application does not limit this.

[0068] In one embodiment, the annular body 31 is partially located in the first mounting hole 11, which increases the contact area between the welding ring 3 and the cover body 1. The annular body 31 is fixed to the cover body 1 by welding, thereby enhancing the stability of the entire top cover assembly 10 structure and preventing the welding ring 3 and the cover body 1 from loosening due to vibration or external force. The welding connection has a certain sealing performance, which can reduce the risk of leakage caused by loose connection between the welding ring 3 and the cover body 1.

[0069] In one embodiment, a mounting groove 12 is provided on the side of the cover body 1 away from the limiting ring 32, and a first mounting hole 11 is provided through the bottom of the mounting groove 12. The annular body 31 includes an annular seat 311 and an annular wall 312 extending along the first direction. The annular seat 311 is installed in the mounting groove 12, one end of the annular wall 312 is connected to the annular seat 311, and the other end of the annular wall 312 extends out of the first mounting hole 11 and is connected to the limiting ring 32. In this way, the contact area between the annular body 31 and the cover body 1 is increased, so that the welding ring 3 and the cover body 1 are more stable after welding, and the risk of loosening of the welding ring 3 and the cover body 1 due to vibration or external force is reduced. The operation of installing the annular seat 311 in the mounting groove 12 realizes the positioning installation of the welding ring 3, so that the welding ring 3 can be quickly installed in place, and the assembly efficiency of the top cover assembly 10 is improved. The annular seat 311 and the limiting ring 32 are respectively arranged on both sides of the pole 2, which can realize the limiting installation and protection of the pole 2 to prevent the pole 2 from shaking or being damaged.

[0070] In actual production, in order to ensure the structural strength of the top cover assembly 10, the cover body 1 is usually made of metal materials, such as aluminum plates. The pole 2 is installed on the cover plate in order to lead out the positive and negative electrodes of the battery cell. Since the cover plate body made of metal materials also has conductivity, in addition, the welding ring 3 is usually made of metal materials in order to be welded and fixed to the cover body 1. In one embodiment, the top cover assembly 10 also includes a lower plastic 6, and the lower plastic 6 includes a straight portion 61 and a sleeve 62. The straight portion 61 is arranged on the side of the cover body 1 away from the limit ring 32 and is in contact with the cover body 1 and the annular seat 311. In this way, the pole 2 can be insulated from the cover body 1 and the annular seat 311 to prevent the cover body 1 and the welding ring 3 from being charged and affecting the use of the battery with the top cover assembly 10. A connecting hole is provided through the straight portion 61 along the first direction, and the connecting hole is connected to the first mounting hole 11. A sleeve 62 is arranged around the connecting hole. One end of the sleeve 62 is connected to the straight portion 61, and the other end of the sleeve 62 is suitable for extending into the through hole to abut against the pole 2. In this way, the lower plastic 6 is used to limit the installation of the pole 2 to prevent the pole 2 from shaking and affecting the use of the top cover assembly 10. In addition, the setting of the connecting hole facilitates the connection between the bottom end of the pole 2 and the positive and negative ears of the battery cell.

[0071] The material of the lower plastic 6 can be selected as needed, for example, the material of the lower plastic 6 can include at least one of plastic, rubber and ceramic materials. Of course, in other embodiments, the material of the lower plastic 6 can be selected as needed, and this application does not limit this.

[0072] In one embodiment, the seal 4 includes a first crimping ring 52 segment 42, a second crimping ring 52 segment 43, a third crimping ring 52 segment 44 and a fourth crimping ring 52 segment 45 which are connected in sequence. The first crimping ring 52 segment 42 is clamped between the limiting ring 32 and the first end face 21, the second crimping ring 52 segment 43 is clamped between the annular wall 312 and the side wall of the pole 2, the third crimping ring 52 segment 44 is clamped between the annular seat 311 and the pole 2, and the fourth crimping ring 52 segment 45 is clamped between the sleeve 62 and the annular seat 311. In this way, multi-stage sealing of the seal 4 is achieved, and the sealing effect of the top cover assembly 10 is improved.

[0073] It should be noted that the material of the seal 4 can be selected as needed, for example, the material of the seal 4 can include at least one of plastic or rubber. Of course, in other embodiments, the material of the seal 4 can be selected as needed, and this application does not limit this.

[0074] In one embodiment, the cover body 1 is further provided with a second mounting hole 13, and the top cover assembly 10 also includes an explosion-proof valve 7 mounted thereon, and a protective sheet mounted on the outside of the explosion-proof valve 7. When the top cover assembly 10 is installed in cooperation with a shell equipped with a battery cell, when the battery cell is overcharged, a large amount of gas is generated in the shell, increasing the internal pressure of the shell. At this time, the gas in the shell can act on the explosion-proof valve 7, and the gas is released through the explosion-proof valve 7, thereby reducing the internal pressure of the shell, preventing the battery from exploding and causing a safety accident. The protective sheet is arranged to cover the mounting hole, so as to protect the explosion-proof valve 7, prevent sharp objects from damaging the explosion-proof valve 7, and affect the use of the explosion-proof valve 7. It can also prevent foreign matter, dust, etc. from falling into the explosion-proof valve 7, affecting the use of the explosion-proof valve 7, thereby making the safety performance of the top cover assembly 10 better, more practical, and further ensuring the service life of the battery.

[0075] Specifically, in the present application, the fixing of the upper plastic ring 5 on the cover body 1 is achieved by welding the welding ring 3 to the cover body 1, and the sealing portion of the upper plastic ring 5 is suitable for pressing the pole 2 on the cover body 1, and the seal 4 seals the gap between the pole 2 and the welding ring 3, thereby improving the sealing of the top cover assembly 10. Therefore, the assembly of the top cover assembly 10 only requires one welding process of the welding ring 3 and the cover body 1 to achieve the fixing of the upper plastic ring 5, the pole 2 and the seal 4 on the cover body 1, and then the lower plastic 6 is installed to complete the assembly of the top cover assembly 10, thereby making the assembly of the top cover assembly 10 simpler and more convenient, easy to implement, greatly improving the production efficiency, and preventing problems such as poor welding and failure that may be caused by multiple welding, further improving the safety performance of the battery with the top cover assembly 10, and ensuring the service life of the battery with the top cover assembly 10. In addition, the top cover assembly 10 improved in the present application increases the torsional strength of the top cover assembly 10 and improves the safety performance of the battery cell. Furthermore, the top cover assembly 10 has better current-carrying capacity and can meet the requirements of high-rate charging and discharging.

[0076] On the second aspect, an embodiment of the present invention further proposes a battery, which includes a top cover assembly 10 as described above. The specific structure of the top cover assembly 10 refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0077] On the third aspect, an embodiment of the present invention further proposes an electrical device, which includes a battery as described above. The specific structure of the electrical device refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0078] It should be noted that the type of electrical equipment can be selected as needed, for example, the electrical equipment may include vehicles, energy storage power supplies, consumer electronics, medical equipment or smart cities, etc. Specifically, the present application does not limit the type of electrical equipment.

[0079] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A top cover assembly, characterized in that: include: The cover body is provided with a first mounting hole extending through the cover body along a first direction; A pole, partially disposed in the first mounting hole, the pole having a first end surface disposed away from the first mounting hole; a welding ring, arranged around the circumference of the pole, comprising an annular body and a limiting ring which are connected and arranged, wherein the annular body is connected to the cover body, and the limiting ring is arranged opposite to the first end face and spaced apart along the first direction; A sealing member, sandwiched between the welding ring and the pole, the sealing member wraps around the side of the pole, and the sealing member includes an abutting end portion adjacent to the first end surface; The upper plastic ring comprises a sleeve ring and a crimping ring which are sequentially connected and arranged, wherein the sleeve ring is suitable for being sleeved on the outer side of the annular body, and the crimping ring is connected to the limiting ring; Part of the crimping ring and / or the abutting end portion is sandwiched between the first end surface and the limiting ring.

2. The top cover assembly according to claim 1, characterized in that: Portions of the crimping ring are in sealing contact with the abutment end portion and the first end surface, respectively.

3. The top cover assembly according to claim 1, characterized in that: The crimping ring is in contact with the first end surface, and along the first direction, the thickness of the crimping ring is H1, wherein 0.8 mm≤H1≤5 mm.

4. The top cover assembly according to claim 3, characterized in that: The limiting ring has a limiting hole, and the axis of the limiting hole extends along the first direction; The crimping ring includes a first insulating section and a second insulating section, the first insulating section is sleeved on the limiting ring, the second insulating section abuts against the inner wall of the limiting hole, one end of the second insulating section is connected to the first insulating section, and the other end of the second insulating section abuts against the first end face.

5. The top cover assembly according to claim 4, characterized in that: Along the first direction, the thickness of the first insulating segment is H2, wherein 0.2 mm≤H2<4.8 mm.

6. The top cover assembly according to claim 4, characterized in that: The second insulating section has a through hole, the axis of the through hole extends along the first direction, and the inner side wall of the through hole is gradually contracted inwardly toward the axis of the through hole in a direction toward the first mounting hole.

7. The top cover assembly according to claim 6, characterized in that: The second insulating section comprises: An insulating body, abutting against the inner side wall of the limiting hole and forming the through hole; The insulating platform is convexly arranged on a side of the insulating body away from the penetration hole, and a clamping groove is formed between the insulating platform, the insulating body and the first insulating section, and the limiting ring is clamped in the clamping groove.

8. The top cover assembly according to claim 7, characterized in that: The thickness of the insulating platform is H3, wherein 0.2 mm ≤ H3 < 4.8 mm.

9. The top cover assembly according to any one of claims 1 to 8, characterized in that: One end of the sleeve ring away from the crimping ring is in sealing contact with the cover body.

10. The top cover assembly according to any one of claims 1 to 8, characterized in that: The thickness of the pole is H1, wherein 2mm≤H1≤5mm.

11. The top cover assembly according to any one of claims 1 to 8, characterized in that: Two poles are provided, and one of the two poles includes a first metal layer and a second metal layer arranged in sequence along the first direction, the first metal layer is arranged away from the limiting ring, and along the first direction, the thickness of the first metal layer is H4, and the thickness of the second metal layer is H5, wherein 0.5mm≤H4≤3.5mm; and / or, 1.5mm≤H5≤4.5mm.

12. The top cover assembly according to any one of claims 1 to 8, characterized in that: The annular main body portion is located in the first mounting hole and is fixed to the cover body by welding.

13. The top cover assembly according to claim 12, characterized in that: A mounting groove is provided on one side of the cover body away from the limiting ring, and the first mounting hole is penetrated through the bottom of the mounting groove; The annular body includes an annular seat and an annular wall extending along the first direction, the annular seat is installed in the installation groove, one end of the annular wall is connected to the annular seat, and the other end of the annular wall extends out of the first installation hole and is connected to the limiting ring.

14. The top cover assembly according to claim 13, characterized in that: Also includes a lower plastic, the lower plastic includes: A straight portion, the straight portion is arranged on a side of the cover body away from the limiting ring and is in contact with the cover body and the annular seat, the straight portion is provided with a connecting hole penetrating along the first direction, and the connecting hole is connected with the first mounting hole; A sleeve is arranged around the communicating hole, one end of the sleeve is connected to the straight portion, and the other end of the sleeve is suitable for extending into the through hole to abut against the pole.

15. The top cover assembly according to claim 14, characterized in that: The sealing member comprises a first sealing ring segment, a second sealing ring segment, a third sealing ring segment and a fourth sealing ring segment which are connected in sequence, wherein the first sealing ring segment is clamped between the limiting ring and the first end face, the second sealing ring segment is clamped between the ring wall and the side wall of the pole, the third sealing ring segment is clamped between the annular seat and the pole, and the fourth sealing ring segment is clamped between the sleeve and the annular seat.

16. A battery, characterized in that: Comprising a top cover assembly as claimed in any one of claims 1 to 15.

17. An electrical equipment, characterized in that: Comprising the battery of claim 16.

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