Top cover assembly, battery and electric equipment

Abstract

The utility model 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 along a first direction in a penetrating manner, the pole is partially arranged in the first mounting hole, and the pole is provided with a first end face arranged deviating 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 utility model relates to the technical field of electric equipment, concretely relates to top cover assembly, battery and electric equipment. BACKGROUND

[0002] The battery generally includes an electric core, a shell containing the electric core, a top cover assembly sealedly installed on the shell, and electrolyte filled in the shell. The top cover assembly has a significant impact on the safety of the battery. Since the top cover assembly is used to close the shell, the top cover assembly needs to have good sealing performance to prevent air and moisture from entering the inside 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. The pole and the welding ring only form a sealing barrier at the pole side wall connection, which results in poor sealing performance of the top cover assembly. SUMMARY

[0003] Embodiments of the utility model provide a top cover assembly, a battery and electric equipment, aiming to improve the sealing performance of the top cover assembly.

[0004] In a first aspect, embodiments of the utility model provide a top cover assembly.

[0005] In an embodiment, the top cover assembly comprises:

[0006] a cover body provided with a first mounting hole in the first direction;

[0007] a pole partially arranged in the first mounting hole, the pole having a first end face arranged away from the first mounting hole;

[0008] a welding ring surrounding the side of the pole, comprising a connected annular body and a limiting ring, the annular body being connected to the cover body, and the limiting ring being arranged opposite and spaced apart from the first end face in the first direction;

[0009] a sealing member clamped between the welding ring and the pole, the sealing member being arranged to wrap the side of the pole, and the sealing member comprising an abutting end portion adjacent to the first end face;

[0010] an upper plastic ring comprising a sleeving ring and a crimping ring connected in sequence, the sleeving ring being adapted to be sleeved on the outside of the annular body, and the crimping ring being connected to the limiting ring;

[0011] wherein part of the crimping ring and / or the abutting end portion is clamped between the first end face and the limiting ring.

[0012] In an embodiment, part of the crimping ring is respectively sealed and abutted with the abutting end portion and the first end face.

[0013] In an embodiment, the crimping ring is in abutment with the first end face, and the thickness of the crimping ring is H1 in the first direction, wherein 0.8mm≤H1≤5mm.

[0014] In an embodiment, the limiting ring has a limiting hole, and an axis of the limiting hole is arranged to extend in the first direction.

[0015] The crimping ring comprises a first insulating section and a second insulating section, the first insulating section is sleeved on the limiting ring, the second insulating section is in abutment with an inner side wall of the limiting hole, one end of the second insulating section is connected with the first insulating section, and the other end of the second insulating section is in abutment with the first end face.

[0016] In an embodiment, the thickness of the first insulating section is H2 in the first direction, wherein 0.2mm≤H2<4.8mm.

[0017] In an embodiment, the second insulating section has a through hole, and an axis of the through hole is arranged to extend in the first direction, and an inner side wall of the through hole is arranged to taper inwardly in the direction of the axis of the through hole in the direction toward the first mounting hole.

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

[0019] an insulating body in abutment with the inner side wall of the limiting hole and formed with the through hole;

[0020] an insulating table protruding from a side of the insulating body away from the through hole, and a clamping groove is formed between the insulating table, the insulating body and the first insulating section, and the clamping groove is used for clamping the limiting ring.

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

[0022] In an embodiment, one end of the sleeving ring away from the crimping ring is in sealing abutment with the cover.

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

[0024] In an embodiment, two pole columns are provided, one of the two pole columns comprises a first metal layer and a second metal layer arranged in sequence in the first direction, the first metal layer is arranged away from the limiting ring, the thickness of the first metal layer is H4 in the first direction, 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 an embodiment, the annular body portion is in the first mounting hole and is welded to the cover.

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

[0027] The annular body comprises an annular seat and an annular wall extending in the first direction, the annular seat is mounted in the mounting 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 mounting hole and is connected to the limiting ring.

[0028] In an embodiment, a lower plastic is further included, and the lower plastic comprises:

[0029] A flat portion is arranged on a side of the cover away from the limiting ring and abuts against the cover and the annular seat, the flat portion is provided with a communication hole penetrating in the first direction, and the communication hole is in communication with the first mounting hole;

[0030] A sleeve is arranged around a circumferential side of the communication hole, one end of the sleeve is connected to the flat portion, and the other end of the sleeve is adapted to extend into the through hole to abut against the pole column.

[0031] In an embodiment, 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 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 annular wall and the side wall of the pole column, the third sealing ring segment is clamped between the annular seat and the pole column, and the fourth sealing ring segment is clamped between the sleeve and the annular seat.

[0032] In a second aspect, the application further provides a battery, which comprises the top cover assembly as described above.

[0033] In a third aspect, the application further provides a power consumption device, which comprises the battery as described above.

[0034] The embodiment of the utility model has the advantages of:

[0035] In the embodiment of the utility model, the cover body is provided with a first mounting hole penetrating along the first direction, and the first mounting hole provides a mounting position for the mounting of the pole. By arranging the pole part in the first mounting hole, a more compact design of the top cover assembly can be realized, the space occupied by the pole is reduced, and thus the overall space utilization of the battery or the electrical equipment is improved. The sealing element is cleverly clamped 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 sealing element abuts the first end face of the pole, further enhancing the sealing effect and reducing the risk of leakage caused by the gap between the end faces. The crimping ring is connected with the limiting ring, and part and / or the abutting end of the crimping ring is clamped between the first end face and the limiting ring. In this way, on the one hand, the limiting installation of the pole is realized, and the pole is prevented from falling out of the first mounting hole. On the other hand, the crimping ring part and / or the abutting end 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 not only play a sealing role, but also form an insulation barrier between the welding ring and the pole, which isolates the electrical connection between the welding ring and the pole to a certain extent, thereby reducing the electrical failure and improving the safety of the electrical equipment with the top cover assembly. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0037] Figure 1 It is the structure schematic diagram of the top cover assembly provided by the embodiment of the utility model;

[0038] Figure 2 It is Figure 1 It is the explosion schematic diagram of the top cover assembly shown in figure 1;

[0039] Figure 3 It is Figure 1 It is the sectional view schematic diagram of the top cover assembly (one angle of view) shown in figure 1;

[0040] Figure 4 It is Figure 1 It is the sectional view schematic diagram of the top cover assembly (another angle of view) shown in figure 1;

[0041] Figure 5 It is Figure 1 It is the sectional view schematic diagram of the upper plastic ring in figure 1;

[0042] Figure 6 is Figure 1 is a structural diagram of a welding ring.

[0043] BRIEF DESCRIPTION OF DRAWINGS

[0044] 10, top cover assembly; 1, cover body; 11, first mounting hole; 12, mounting groove; 13, second mounting hole; 2, pole column; 21, first end face; 22, first metal layer; 23, second metal layer; 3, welding ring; 31, annular body; 311, annular seat; 312, annular wall; 32, limiting ring; 321, limiting hole; 4, sealing element; 41, abutting end; 42, first sealing ring segment; 43, second sealing ring segment; 44, third sealing ring segment; 45, fourth sealing ring segment; 5, upper plastic ring; 51, sleeving ring; 52, crimping ring; 521, first insulation segment; 522, second insulation segment; 5221, penetrating hole; 5223, insulation body; 5224, insulation table; 5225, clamping groove; 6, lower plastic; 61, flat portion; 62, sleeve; 7, explosion-proof valve; 8, protective sheet; 9, connecting sheet. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device.

[0046] A battery generally comprises a battery cell, a shell accommodating the battery cell, a top cover assembly sealingly mounted on the shell, and an electrolyte filled in the shell. The top cover assembly has a significant impact on the safety of the battery. Since the top cover assembly is used to close the shell, the top cover assembly needs to have good sealing performance to prevent air and moisture from entering the inside 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 column, so that the pole column and the welding ring only form a sealing barrier at the connection of the side wall of the pole column. Thus, the sealing performance of the top cover assembly is poor.

[0047] In view of this, the present application provides a top cover assembly, Figures 1 to 6The utility model provides a top cover assembly's embodiment structure schematic drawing provided by the utility model has higher sealing.

[0048] Refer to Figures 1 to 4 , top cover assembly 10 includes cover body 1, pole 2, welding ring 3, sealing element 4 and upper plastic ring 5, cover body 1 is provided with first mounting hole 11 along the first direction, pole 2 is partially arranged in first mounting hole 11, pole 2 has the first end surface 21 set apart from first mounting hole 11;Welding ring 3 is surrounded in the circumferential side of pole 2, including the annular main body 31 of connection setting and the limiting ring 32, the annular main body 31 is connected with cover body 1, the limiting ring 32 is opposite and interval setting along the first direction with the first end surface 21;Sealing element 4 is clamped between welding ring 3 and pole 2, and the side part of sealing element 4 is wrapped in pole 2, and sealing element 4 includes the abutting end 41 of first end surface 21;Upper plastic ring 5 includes the sleeve ring 51 and the pressure joint ring 52 of connection setting in sequence, the sleeve ring 51 is suitable for being sleeved in the outside of annular main body 31, and the pressure joint ring 52 is connected with limiting ring 32, wherein the part of pressure joint ring 52 and / or abutting end 41 is clamped between first end surface 21 and limiting ring 32.

[0049] In the embodiment of the utility model, cover body 1 is provided with first mounting hole 11 along the first direction, and the setting of first mounting hole 11 provides the installation position for the installation of pole 2.Through the part of pole 2 is arranged in first mounting hole 11, the more compact design of top cover assembly 10 can be realized, and the space occupied by pole 2 is reduced, thereby improving the overall space utilization of battery or electrical equipment.Sealing element 4 is clamped between welding ring 3 and pole 2, and the side part of pole 2 is wrapped, effectively preventing external liquid or gas from penetrating into the inside through the gap between pole 2 and cover body 1.The abutting end 41 of sealing element 4 is adjacent to the first end surface 21 of pole 2, which further enhances the sealing effect and reduces the risk of leakage caused by the gap between the end faces.The pressure joint ring 52 is connected with the limiting ring 32, and the part of the pressure joint ring 52 and / or the abutting end 41 is clamped between the first end surface 21 and the limiting ring 32.In this way, on the one hand, the limiting installation of the pole 2 is realized, and the pole 2 is prevented from falling out of the first mounting hole 11.On the other hand, the pressure joint ring 52 part and / or the abutting end 41 form a tight sealing barrier between the first end surface 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 pressure joint ring 52 and / or the abutting end 41 not only play a sealing role, but also form an insulation barrier between the welding ring 3 and the pole 2, which isolates the electrical connection between the welding ring 3 and the pole 2 to a certain extent, thereby reducing the electrical failure and improving the safety of the electrical equipment with the top cover assembly 10.

[0050] In an embodiment, the portion of the crimping ring 52 sealingly abuts against the abutment end 41 and the first end face 21 respectively, so that 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 one hand. On the other hand, the crimping ring 52 and the abutment end 41 completely insulate the pole 2 and the welding ring 3, 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. In addition, the portion of the crimping ring 52 sealingly abutting against the abutment end 41 and the first end face 21 respectively can stabilize the installation of the pole 2, avoid the pole 2 from shaking, and ensure that the battery with the top cover assembly 10 can work normally.

[0051] In an embodiment, the crimping ring 52 abuts against the first end face 21, and the thickness of the crimping ring 52 in the first direction is H1, where 0.8mm≤H1≤5mm. The thickness H1 of the crimping ring 52 is between 0.8mm and 5mm, which can ensure that the crimping ring 52 has sufficient material to form a tight seal, and avoid installation difficulties or material waste caused by excessive thickness. Such a design can ensure that the crimping ring 52 and the first end face 21 form a good sealing effect. The thickness H1 of the crimping ring 52 between 0.8mm and 5mm ensures that the crimping ring 52 can effectively limit the pole 2. The thickness H1 of the crimping ring 52 between 0.8mm and 5mm 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 being damaged. The thickness H1 of the crimping ring 52 between 0.8mm and 5mm helps to improve the durability of the crimping ring 52. Even if it is worn or corroded during use, the crimping ring 52 can still maintain a certain thickness and sealing performance, thereby prolonging the service life of the top cover assembly 10. The thickness H1 of the crimping ring 52 between 0.8mm and 5mm can also improve the voltage resistance of the top cover, make the stability of the battery with the top cover assembly 10 high, be suitable for high-voltage platforms, and make the insulation level of the crimping ring 52 excellent, not easy to fail in extreme conditions.

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

[0053] In an embodiment, the limiting ring 32 has a limiting hole 321, an axis of the limiting hole 321 extends along the first direction, 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 protection of the limiting ring 32 is realized, the risk of rust damage of the limiting ring 32 caused by long-term exposure is avoided, and the limiting ring 32 can always apply pressure to the abutting end portion 41 and / or the crimping ring 52. In addition, since the pole 2 needs to be electrically connected with the bar sheet later, by sleeving the first insulating section 521 on the outside of the limiting ring 32, the bar sheet can be electrically isolated from the limiting ring 32, the electrical contact between the bar sheet and the limiting ring 32 is effectively prevented, the possible electrical interference or short circuit problem is avoided, and it is ensured 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, and the stable installation of the second insulating section 522 is realized. One end of the second insulating section 522 is connected with the first insulating section 521, and the other end of the second insulating section 522 abuts against the first end face 21, so that on the one hand, the limiting installation of the pole 2 is realized, and the pole 2 is prevented from being separated from or shaken in the first mounting hole 11, and on the other hand, the sealing performance of the top cover assembly 10 is improved.

[0054] In an embodiment, along the first direction, the thickness of the first insulating section 521 is H2, wherein 0.2mm≤H2<4.8mm, so that the thickness of the first insulating section 521 is between 0.2mm and 4.8mm, the current flow between the bar sheet and the limiting ring 32 can be effectively prevented, so that the electrical short circuit or interference is avoided, and the electrical coupling between the bar sheet and the limiting ring 32 is reduced, so that the mutual influence between them is reduced. The thickness of the first insulating section 521 between 0.2mm and 4.8mm can ensure the electrical isolation effect while avoiding excessive use of materials. When the thickness of the first insulating section 521 is less than 0.2mm, the electrical isolation of the limiting ring 32 and the bar sheet cannot be effectively realized, and the first insulating section 521 is prone to damage and failure after long-term use. When the thickness of the first insulating section 521 is greater than 4.8mm, the material cost is increased, and additional installation and maintenance difficulties may be caused.

[0055] It should be noted that the electrical coupling refers to the phenomenon that two or more circuit elements interact through electric field or magnetic field. In addition, the thickness of the first insulating section 521 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 first insulating section 521 can be selected as needed, which is not limited in the present application.

[0056] In an embodiment, the second insulation section 522 has a through hole 5221, an axis of the through hole 5221 extends in the first direction, and an inner side wall of the through hole 5221 is tapered inwardly towards the axis of the through hole 5221 in a direction towards the first end face 21. In this way, the tapered through hole 5221 provides a guide for the tab to pass through the through hole 5221 and electrically connect with the pole 2, so that the tab is inserted into the through hole 5221 to electrically connect with the pole 2, and the operation is simple. The tapered inner side wall has a cross-sectional area adjacent to the first end face 21 in the first direction larger than a cross-sectional area away from the first end face 21, which increases the contact area of the inner side wall with the first end face 21, improves the sealing effect of the second insulation section 522 and the effect of pressing the pole 2, and prevents sealing failure or damage due to part shaking or vibration.

[0057] In an embodiment, the second insulation section 522 includes an insulation body 5223 and an insulation base 5224. The insulation body 5223 abuts against the inner side wall of the limiting hole 321, so that the stable installation of the insulation body 5223 is realized. The insulation base 5224 is protruded from a side of the insulation body away from the through hole 5221, and a clamping groove 5225 is formed between the insulation base 5224, the insulation body 5223 and the first insulation section 521. Since the limiting ring 32 is connected with the cover 1, the position of the limiting ring 32 is fixed. Since the limiting ring 32 is 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. Therefore, only the welding ring 3 needs to be fixedly connected with the cover 1, so that the upper plastic ring 5, the pole 2 and the sealing ring are fixed on the cover 1, which makes the assembly of the top cover assembly 10 more simple and convenient, easy to implement, and greatly improves the production efficiency.

[0058] In an embodiment, the thickness of the insulation base 5224 is H3, where 0.2mm≤H3<4.8mm. In this way, the electrical isolation between the pole 2 and the limiting ring 32 is realized, so as to avoid the risk of short circuit of the battery with the top cover. When the thickness of the insulation base 5224 is less than 0.2mm, the electrical isolation between the limiting ring 32 and the pole 2 cannot be effectively realized, and the insulation base 5224 is easy to be damaged and fail after long time use. When the thickness of the insulation base 5224 is greater than 4.8mm, the electrical isolation between the limiting ring 32 and the pole 2 can be realized, but the production cost is increased.

[0059] It should be noted that the thickness of the insulation base 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 insulation base 5224 can be selected as needed, which is not limited in the present application.

[0060] In an embodiment, the sleeve ring 51 is sealed against the cover 1 at an end away from the crimp ring 52. In this way, fluid or gas can be prevented from seeping from the first mounting hole 11, improving the sealing 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 upper plastic ring 5 can include at least one of an insulating material, such as plastic, rubber, and ceramic material. 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, which is not limited in the present application.

[0062] In an embodiment, the thickness of the pole column 2 is H1, where 2mm≤H1≤5mm. In this way, the thickness H1 of the pole column 2 is in the range of 2mm to 5mm, which helps to optimize the current transmission path, reduce the resistance in the transmission process, and make the current flow more smoothly. The thickness H1 of the pole column 2 in the range of 2mm to 5mm helps to reduce the resistance, which means that when transmitting the same current, the power consumption will be reduced, thereby improving the energy utilization efficiency of the battery. The thickness H1 of the pole column 2 in the range of 2mm to 5mm helps to dissipate heat, as heat can be transferred to the surrounding environment more quickly through a larger surface area, which helps to avoid overheating of the pole column 2 when transmitting large currents, thereby protecting the safety of the circuit and equipment. The thickness H1 of the pole column 2 in the range of 2mm to 5mm ensures the strength of the pole column 2 while enabling the transmission of larger currents under the same conditions. When the thickness of the pole column 2 is less than 2mm, although the overcurrent capacity of the pole column 2 is improved, the strength of the pole column 2 is not enough, resulting in easy deformation of the pole column 2. When the thickness of the pole column 2 is greater than 5mm, although the strength of the pole column 2 is ensured, the overcurrent capacity of the pole column 2 is reduced.

[0063] It should be noted that the thickness of the pole column 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 column 2 can be selected as needed, which is not limited in the present application.

[0064] In an embodiment, two pole posts 2 are provided, one of the two pole posts 2 includes a first metal layer 22 and a second metal layer 23 arranged in sequence along a first direction, 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 be selected to have high conductivity, such as copper or silver, to optimize current transmission. The second metal layer 23 can be selected to have other properties (such as corrosion resistance, high strength, etc.) to meet the specific application requirements of the pole post 2, which 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, thus, it helps to ensure that the pole post 2 has good electrical conductivity while maintaining sufficient mechanical strength, thereby achieving the goal of saving production costs while ensuring that the pole post 2 has good current-carrying capacity. In addition, in actual operation, since the first metal layer 22 needs to be welded with the connecting piece 9, the thickness of the first metal layer 22 in the range of 0.5mm to 3.5mm can prevent the risk of welding through the first metal layer 22. In addition, the layered design can also reduce thermal stress caused by temperature changes. When the pole post 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 more effectively dispersed, thereby protecting the pole post 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, which is not limited in the present application. 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, which is not limited in the present application.

[0066] In addition, the pole post 2 is made of a composite plate by an integrated forming process, and the shape of the joint line between the first metal layer and the second metal layer is formed naturally during the metal forming process, and the joint line is attached to the outer shape of the pole post 2. The combination interface of the pole post 2 is physically combined, there are pores in the microstructure, and two kinds of metal materials can exist on a horizontal plane at the same time.

[0067] Specifically, the material of the second metal layer 23 can include aluminum, aluminum alloy, magnesium, or magnesium alloy. Of course, in other embodiments, the material of the second metal layer 23 can be selected as needed, which is not limited in the present application. 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 can be selected as needed, which is not limited in the present application.

[0068] In an embodiment, the annular body 31 is partially located in the first mounting hole 11, increasing the contact area between the welding ring 3 and the cover 1. By welding the annular body 31 and the cover 1, the stability of the entire top cover assembly 10 structure is thus enhanced, preventing the welding ring 3 and the cover 1 from loosening due to vibration or external force. The welding connection has a certain sealing property, which can reduce the risk of leakage at the welding position of the welding ring 3 and the cover 1 due to loose connection.

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

[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 material, such as aluminum plate. The pole 2 is installed on the cover plate, and is used to lead out the positive and negative poles of the battery cell. Since the cover plate body made of metal material also has the ability to conduct electricity, in addition, the welding ring 3 is usually made of metal material in order to be welded and fixed with the cover body 1. In an embodiment, the top cover assembly 10 further comprises a lower plastic 6, the lower plastic 6 comprises a flat portion 61 and a sleeve 62, the flat portion 61 is arranged on the side of the cover body 1 away from the limiting ring 32 and abuts with the cover body 1 and the annular seat 311, so that the pole 2 can be insulated and isolated from the cover body 1 and the annular seat 311, preventing the cover body 1 and the welding ring 3 from being electrified and affecting the use of the battery with the top cover assembly 10. The flat portion 61 is provided with a communication hole in the first direction, the communication hole is in communication with the first mounting hole 11, the sleeve 62 is arranged around the side of the communication hole, one end of the sleeve 62 is connected with the flat portion 61, and the other end of the sleeve 62 is adapted to extend into the through hole to abut with the pole 2, so that the lower plastic 6 is limited and installed on the pole 2, avoiding the shaking of the pole 2 affecting the use of the top cover assembly 10, and in addition, the setting of the communication hole facilitates the connection of the bottom end of the pole 2 with the positive and negative poles 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 material. Of course, in other embodiments, the material of the lower plastic 6 can be selected as needed, which is not limited in the present application.

[0072] In an embodiment, the sealing member 4 comprises 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 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, so that the multi-segment sealing of the sealing member 4 is realized, and the sealing effect of the top cover assembly 10 is improved.

[0073] It should be noted that the material of the sealing member 4 can be selected as needed, for example, the material of the sealing member 4 can include at least one of plastic or rubber. Of course, in other embodiments, the material of the sealing member 4 can be selected as needed, which is not limited in the present application.

[0074] In an embodiment, the cover body 1 is further provided with a second mounting hole 13, the top cover assembly 10 further comprises an explosion-proof valve 7 mounted on the cover body 1, and a protective sheet mounted outside the explosion-proof valve 7. When the top cover assembly 10 is mounted in cooperation with the shell assembled with the battery cell, when overcharging occurs in the battery cell, a large amount of gas is generated in the shell, the internal pressure of the shell is increased, at this time, the gas in the shell can act on the explosion-proof valve 7, 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 safety accidents. The protective sheet is arranged to cover the mounting hole, and is used to protect the explosion-proof valve 7 from being damaged by sharp objects, affecting the use of the explosion-proof valve 7, and preventing foreign matter, dust and the like from falling into the explosion-proof valve 7, thereby improving the safety performance of the top cover assembly 10, improving the practicability, and further improving 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 and the cover body 1, the sealing part of the upper plastic ring 5 is adapted to press the pole 2 tightly on the cover body 1, and the sealing element 4 seals the gap between the pole 2 and the welding ring 3, thereby improving the sealing performance of the top cover assembly 10. Therefore, the assembly of the top cover assembly 10 only needs one welding process of the welding ring 3 and the cover body 1, and then the upper plastic ring 5, the pole 2 and the sealing element 4 are fixed on the cover body 1, and then the lower plastic 6 is assembled, thereby completing the assembly of the top cover assembly 10, thereby making the assembly of the top cover assembly 10 more simple and convenient, easy to implement, greatly improving the production efficiency, preventing poor welding and failure 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 improved top cover assembly 10 of the present application improves the torsional strength of the top cover assembly 10, and improves the safety performance of the battery cell. The top cover assembly 10 has better overcurrent capacity and can meet the large rate charging and discharging.

[0076] In a second aspect, the embodiments of the utility model further propose a battery, the battery comprises the top cover assembly 10 as described above, and the specific structure of the top cover assembly 10 refers to the above-mentioned embodiments. Since the battery adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0077] In a third aspect, the embodiments of the utility model further propose an electric equipment, the electric equipment comprises the battery as described above, and the specific structure of the electric equipment refers to the above-mentioned embodiments. Since the electric equipment adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0078] It should be noted that the types of the electric equipment can be selected as needed, for example, the electric equipment can include a vehicle, an energy storage power supply, consumer electronics, medical equipment, or a smart city, etc.

[0079] The above has introduced the embodiments of the utility model in detail, the principle and implementation mode of the utility model have been described in this paper by applying specific examples, the above embodiment explanation is only for helping understanding the method and core idea of the utility model; simultaneously, for the technical personnel in the art, according to the idea of the utility model, there will be changes in specific implementation mode and application range, and on the basis of the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A cap assembly, characterized by, The utility model relates to a sealing structure of a terminal post, comprising: a cover body provided with a first mounting hole in a first direction; a pole partially arranged in the first mounting hole, the pole having a first end face arranged away from the first mounting hole; a welding ring arranged around the pole, comprising a ring-shaped main body and a limiting ring, the ring-shaped main body being connected to the cover body, the limiting ring being arranged opposite to and spaced apart from the first end face in the first direction; a sealing element arranged between the welding ring and the pole, the sealing element being arranged around the side of the pole, the sealing element comprising an abutting end portion adjacent to the first end face; an upper plastic ring comprising a sleeving ring and a crimping ring connected in sequence, the sleeving ring being adapted to be sleeved on the outside of the ring-shaped main body, and the crimping ring being connected to the limiting ring; wherein part of the crimping ring and / or the abutting end portion is arranged between the first end face and the limiting ring.

2. The roof assembly of claim 1, wherein, Part of the crimping ring is in sealing abutment with the abutting end portion and the first end face, respectively.

3. The roof assembly of claim 1, wherein, The crimping ring is in abutment with the first end face, and the thickness of the crimping ring in the first direction is H1, wherein 0.8mm≤H1≤5mm.

4. The roof assembly of claim 3, wherein, The limiting ring has a limiting hole, and the axis of the limiting hole extends in the first direction; The crimping ring comprises a first insulating section and a second insulating section, the first insulating section being sleeved on the limiting ring, and the second insulating section being in abutment with the inner side wall of the limiting hole, one end of the second insulating section being connected to the first insulating section, and the other end of the second insulating section being in abutment with the first end face.

5. The roof assembly of claim 4, wherein, In the first direction, the thickness of the first insulating section is H2, wherein 0.2mm≤H2<4.8mm.

6. The roof assembly of claim 4, wherein, The second insulating section has a through hole, and the axis of the through hole extends in the first direction, and the inner side wall of the through hole is tapered inward in the direction of the axis of the through hole towards the first mounting hole.

7. The roof assembly of claim 6, wherein, The second insulating section comprises: an insulating main body in abutment with the inner side wall of the limiting hole and having the through hole formed therein; an insulating platform protruding from one side of the insulating main body away from the through hole, the insulating platform, the insulating main body and the first insulating section forming a clamping groove for clamping the limiting ring.

8. The roof assembly of claim 7, wherein, The thickness of the insulating platform is H3, wherein 0.2mm≤H3<4.8mm.

9. The roof assembly of any one of claims 1 to 8, wherein, The end of the sleeving ring away from the crimping ring is in sealing abutment with the cover body.

10. The roof assembly of any one of claims 1 to 8, wherein, The thickness of the pole is H1, wherein 2mm≤H1≤5mm.

11. The roof assembly of any one of claims 1 to 8, wherein, The pole is provided with two poles, one of the two poles comprising a first metal layer and a second metal layer arranged in the first direction in sequence, the first metal layer being arranged away from the limiting ring, the thickness of the first metal layer in the first direction being H4, and the thickness of the second metal layer being H5, wherein 0.5mm≤H4≤3.5mm; and / or, 1.5mm≤H5≤4.5mm.

12. The roof assembly of any one of claims 1 to 8, wherein, The ring-shaped main body is partially arranged in the first mounting hole and is welded and fixed to the cover body.

13. The roof assembly of claim 12, wherein, The side of the cover body away from the limiting ring is provided with a mounting groove, and the bottom of the mounting groove is provided with the first mounting hole in a penetrating manner; The annular body comprises an annular seat and an annular wall extending along the first direction, the annular seat is installed in the mounting slot, one end of the annular wall is connected with the annular seat, and the other end of the annular wall extends out of the first mounting hole and is connected with the limiting ring.

14. The roof assembly of claim 13, wherein, Further comprising a lower plastic, the lower plastic comprises: A flat portion is arranged on the side of the cover body away from the limiting ring and abuts against the cover body and the annular seat, a communication hole is arranged through the flat portion along the first direction, and the communication hole is in communication with the first mounting hole; A sleeve is arranged around the periphery of the communication hole, one end of the sleeve is connected with the flat portion, and the other end of the sleeve is adapted to extend into the through hole to abut against the pole column.

15. The roof assembly of claim 14, wherein, 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 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 annular wall and the side wall of the pole column, the third sealing ring segment is clamped between the annular seat and the pole column, and the fourth sealing ring segment is clamped between the sleeve and the annular seat.

16. A battery, characterized by The top cover assembly comprises the top cover assembly according to any one of claims 1 to 15.

17. An electrical device, characterized by The battery comprises the battery according to claim 16.

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