Top cover assembly, battery and electric equipment

Abstract

The utility model provides a top cover subassembly, battery and electric equipment, wherein the top cover subassembly is used for connecting battery cell, includes: top cover, weldment, pole and upper plastic part, the weldment includes vertical section and bending section, the upper plastic part includes first section, second section and third section that connect in proper order, along the radial direction of first through hole, the first through hole passes through the first through hole, and the second through hole passes through the second through hole. The second section is arranged between the pole and the bent section, the first section and the third section are respectively connected with two ends of the second section along the axial direction of the first through hole and extend towards the direction deviating from the pole, and the bent section is clamped between the first section and the third section. The upper plastic part is provided with the first section, the second section and the third section which are sequentially connected, and the bent section in the welding part is clamped between the first section and the third section, so that the upper plastic part is limited in the axial direction of the first through hole, and the stability of connection between the upper plastic part and the welding part is greatly improved; and the probability that the upper plastic part falls off due to accidents such as collision and the like is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a top cap subassembly, battery and electric equipment. BACKGROUND

[0002] Secondary battery is mainly applied to energy storage battery and power battery in new energy industry, and with the development of new energy industry, the requirement of battery is also continuously improved, and the safety performance and sealing performance of battery top cap as the core part of battery are paid more and more attention.

[0003] In the top cap assembly process, the assembly of the battery top cap is mainly made by injection molding process, and the insulation and relative fixation between the welding ring and the pole are realized by the plastic part formed by injection molding. However, the existing top cap assembly structure design is unreasonable, the connection between the upper plastic part and the welding ring is loose after injection molding, which leads to the easy falling of the upper plastic part and the large safety hazard. SUMMARY

[0004] The embodiment of the utility model provides a top cap subassembly, which can improve the technical problem that the upper plastic part of the top cap subassembly is easy to fall off in the related art.

[0005] In the first aspect, the embodiment of the utility model provides a top cap subassembly for connecting the battery cell, which comprises:

[0006] A top cap, wherein a first through hole is arranged on the top cap;

[0007] A welding part, comprising a vertical section and a bent section, wherein the vertical section is at least partially attached to the inner wall of the first through hole, the vertical section is enclosed to form a second through hole, and the second through hole corresponds to the first through hole; the bent section is connected to one end of the vertical section away from the battery cell, and the bent section extends towards the second through hole;

[0008] A pole, wherein the pole is at least partially arranged in the second through hole and is spaced apart from the welding part; and

[0009] An upper plastic part, wherein the upper plastic part comprises a first section, a second section and a third section connected in sequence, along the radial direction of the first through hole, the second section is arranged between the pole and the bent section, the first section and the third section are respectively connected to both ends of the second section along the axial direction of the first through hole and extend in the direction away from the pole, and the bent section is clamped between the first section and the third section.

[0010] In some embodiments, the size of the third section along the radial direction of the first through hole is between 0.2mm and 1.8mm.

[0011] In some embodiments, the third segment has a dimension along an axial direction of the first through hole of between 0.2mm and 1mm.

[0012] In some embodiments, the second segment has a dimension along a radial direction of the first through hole of between 0.1mm and 1.5mm.

[0013] In some embodiments, the welding piece further comprises a bearing segment connected to an end of the vertical segment distal to the bent segment, and the bearing segment comprises a first end portion extending away from the second through hole, and the first end portion is connected to the top cover.

[0014] In some embodiments, the top cover assembly further comprises a sealing piece, the bearing segment further comprises a second end portion extending toward the second through hole, and the sealing piece is clamped between the pole post and the second end portion.

[0015] In some embodiments, the pole post comprises a main body and a protruding portion protruding from a circumferential surface of the main body, the protruding portion corresponds to the bent segment, and the protruding portion is clamped between the sealing piece and the upper plastic piece.

[0016] In some embodiments, the sealing piece comprises a fourth segment, a fifth segment, and a sixth segment, the fifth segment is clamped between the vertical segment and the protruding portion, the fourth segment and the sixth segment are respectively connected to two ends of the fifth segment along a radial direction of the first through hole and extend toward the pole post, and at least part of the protruding portion is clamped between the fourth segment and the sixth segment.

[0017] In some embodiments, the fourth segment is connected to the third segment.

[0018] In some embodiments, the upper plastic piece comprises a first top surface facing away from the battery cell, the pole post comprises a second top surface facing away from the battery cell, and along an axial direction of the first through hole, a height of the first top surface is more than 0.3mm lower than a height of the second top surface.

[0019] In a second aspect, embodiments of the utility model provide a battery, comprising:

[0020] a shell;

[0021] a battery cell, the battery cell is arranged in the shell; and

[0022] a top cover assembly as described in the foregoing embodiments, the top cover assembly is welded to the shell to close the shell.

[0023] In a third aspect, embodiments of the utility model provide a power utilization device, comprising the battery as described in the foregoing embodiments or the battery pack as described in the foregoing embodiments.

[0024] The embodiment of the utility model has the advantages of

[0025] The utility model discloses a first through hole, a second through hole and a third through hole are arranged on the upper cover, and the upper plastic part is connected with the welding part through the first through hole, the second through hole and the third through hole, and the upper plastic part is clamped between the first through hole and the third through hole, and the second section is clamped between the pole and the bending section, so that the stability of the connection between the upper plastic part and the welding part is improved, and the probability of the upper plastic part falling off due to the accidental situation such as collision is reduced, and the safety of the battery cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawing needed to be used in the embodiment description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for the person skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0027] Figure 1 It is the structure schematic view of the top cover assembly provided by the embodiment of the utility model;

[0028] Figure 2 It is the explosion view of the top cover assembly provided by the embodiment of the utility model;

[0029] Figure 3 It is the sectional view of the top cover assembly provided by the embodiment of the utility model;

[0030] Figure 4 It is Figure 3 The enlarged view of A in the figure;

[0031] Figure 5 It is the connection structure schematic view of the sealing piece and the upper plastic part provided by the embodiment of the utility model;

[0032] Figure 6 It is the sectional view of the welding part provided by the embodiment of the utility model.

[0033] The respective marks in the figure are:

[0034] 1, top cover assembly;

[0035] 11, top cover; 111, first through hole;

[0036] 12, welding part; 121, vertical section; 1211, second through hole; 122, bending section; 123, bearing section; 1231, first end; 1232, second end;

[0037] 13, pole; 131, main body; 132, protruding part; 133, second top surface;

[0038] 14, upper plastic part; 141, first section; 142, second section; 143, third section; 144, first top surface;

[0039] 15, sealing part; 151, fourth section; 152, fifth section; 153, sixth section;

[0040] H1, radial direction of the first through hole;

[0041] H2, axial direction of the first through hole. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, 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 the specific is the drawing direction in the drawings. And 'inner' and 'outer' are relative to the outline of the device.

[0043] The power battery generally comprises a battery cell, a battery shell accommodating the battery cell, a battery top cover sealedly mounted on the battery shell, and an electrolyte filled in the battery shell. When the battery shell is closed by the battery top cover, the positive and negative pole lugs of the battery cell need to be inserted into the bottom end inside the top cover and connected with the pole post, so that after the battery shell is closed by the battery top cover, the top end of the pole post exposed outside is connected with the external circuit, realizing the leading-out of the positive and negative pole posts of the battery cell. However, the inventor of the utility model finds that in the use process of the power battery provided by the related art, the connection between the upper plastic and other structures is not tight enough, so that when the collision, falling and other situations occur, the upper plastic is easy to fall off, resulting in short circuit.

[0044] Based on the above situation, with reference to Figures 1 to 5The utility model discloses a first aspect provides a kind of top cover assembly 1, top cover assembly 1 is used to connect electric core, top cover assembly 1 includes top cover 11, welding piece 12, pole 13 and upper plastic piece 14.Top cover 11 is provided with first through-hole 111.Welding piece 12 includes vertical section 121 and bending section 122, vertical section 121 is at least partially attached to the inner wall of first through-hole 111, and vertical section 121 is enclosed into second through-hole 1211, and second through-hole 1211 corresponds with first through-hole 111;Bending section 122 is connected with the end of vertical section 121 away from electric core, and bending section 122 extends towards second through-hole 1211.Pole 13 is at least partially arranged in second through-hole 1211 and is spaced apart from welding piece 12.Upper plastic piece 14 includes sequentially connected first section 141, second section 142 and third section 143, along the radial direction H1 of first through-hole, second section 142 is arranged between pole 13 and bending section 122, and first section 141 and third section 143 are respectively connected with the two ends of second section 142 along the axial direction H2 of first through-hole and extend towards the direction away from pole 13, and bending section 122 is clamped between first section 141 and third section 143.

[0045] Wherein, first through-hole 111 and second through-hole 1211 are correspondingly arranged with pole 13, so that pole 13 can be connected with the connecting sheet, tab and other structures inside electric core through first through-hole 111 and second through-hole 1211, to realize the conduction of circuit.Welding piece 12 includes vertically connected vertical section 121 and bending section 122, and vertical section 121 can be connected with the inner wall of first through-hole 111 by welding, bonding, clamping and other ways, and makes vertical section 121 fit with the inner wall of first through-hole 111, so as to fix welding piece 12 on top cover 11, and save the space occupied by top cover assembly 1.Bending section 122 and vertical section 121 can be made by one-piece forming, or bending section 122 and vertical section 121 can be made respectively, and connected into welding piece 12 by subsequent welding, bonding and other ways, which is not limited in the utility model.Bending section 122 extends towards second through-hole 1211, that is, towards the inside of welding piece 12, which helps to improve the tightness of the connection between upper plastic piece 14 and bending section 122 after injection molding, and reduces the material of upper plastic piece 14.

[0046] Pole 13 is made of metal material, usually copper, aluminum, nickel and other materials with good conductivity.Pole 13 is spaced apart from welding piece 12 to prevent short circuit, and the gap between pole 13 and welding piece 12 is formed to facilitate the normal operation of subsequent injection molding process.

[0047] The upper plastic part 14 comprises a first section 141, a second section 142 and a third section 143 connected by bending. The first section 141 and the third section 143 extend away from the pole 13 and clamp the bent section 122 therebetween, so that the upper plastic part 14 is fixed in the axial direction H2 of the first through hole; and since the welding part 12 is fixedly connected to the cover plate, the upper plastic part 14 that partially surrounds the bent section 122 is also stably installed on the cover plate, so that the upper plastic part 14 is not easily detached during production, use, or vibration during transportation of the battery cell, thereby improving the connection reliability between the components in the top cover assembly 1.

[0048] The second section 142 is arranged between the pole 13 and the bent section 122 and serves to isolate the pole 13 and the bent section 122. The second section 142 can prevent the pole 13 and the bent section 122 from directly contacting each other, thereby avoiding possible short circuiting. Moreover, the second section 142 can serve as a buffer to some extent. When the top cover assembly 1 is subjected to external vibration or impact, the second section 142 can prevent damage caused by mutual friction or collision between the components in the top cover assembly 1.

[0049] The third section 143 extends to the area inside the second through hole 1211, which can better fill the space in the second through hole 1211, reduce the possibility of dust, moisture and other impurities in the external environment entering the area of the first through hole 111 and the second through hole 1211, and reduce the probability of the battery cell being damp or corroded. This can effectively prolong the service life of the battery cell and improve the safety and performance stability of the battery.

[0050] It can be understood that the upper plastic part 14 is usually made by injection molding. The upper plastic part 14 can be injection molded by a specific mold and then installed in the top cover assembly 1. Alternatively, the pole 13 and the welding part 12 can be assembled to form an intermediate part, and then the upper plastic part 14 can be injection molded on the intermediate part. In this case, in order to form the third section 143 of the upper plastic part 14, the intermediate part can be rotated to make the fluid material flow along the bent section 122 before the fluid material solidifies. Alternatively, a protruding section can be added to the vertical section 121, so that a gap is formed between the protruding section and the bent section 122. In this way, the fluid material can flow into the gap and form the third section 143.

[0051] The utility model discloses a first section 141, second section 142 and third section 143 are connected in proper order to the upper plastic piece 14, and the bending section 122 in the welding piece 12 is clamped between the first section 141 and the third section 143, realizes the spacing of the upper plastic piece 14 on the axial direction H2 of the first through -hole, and the second section 142 is clamped between the pole 13 and the bending section 122, realizes the spacing of the upper plastic piece 14 on the radial direction H1 of the first through -hole, thereby greatly improve the stability of the connection between the upper plastic piece 14 and the welding piece 12, reduce the probability that the upper plastic piece 14 falls off due to the accidental situation such as collision, thereby improve the security of the electric core.

[0052] In an embodiment, with reference to Figure 4 and Figure 5 The size of the third section 143 along the radial direction H1 of the first through -hole is between 0.2mm and 1.8mm.

[0053] If the size of the third section 143 along the radial direction H1 of the first through -hole is less than 0.2mm, the length of the third section 143 is too small, and the clamping effect of the first section 141 and the third section 143 on the bending section 122 is poor, and if a relatively strong impact, collision, etc. occurs, the upper plastic piece 14 is still likely to separate from the bending section 122. If the size of the third section 143 along the radial direction H1 of the first through -hole is greater than 1.8mm, the third section 143 is too long, and occupies a larger space, resulting in that the volume of the entire top cover assembly 1 is too large, which is easy to affect the installation of other components in the electric core. Therefore, in the embodiment of the utility model, the size of the third section 143 along the radial direction H1 of the first through -hole is set to be between 0.2mm and 1.8mm, and exemplarily can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, so that the length of the third section 143 is maintained within a reasonable range, which can not only ensure the stability of the connection between the upper plastic piece 14 and the welding piece 12, but also reduce the influence of the third section 143 on other structures in the electric core.

[0054] In an embodiment, with reference to Figure 4 and Figure 5 The size of the third section 143 along the axial direction H2 of the first through -hole is between 0.2mm and 1mm.

[0055] If the size of the third segment 143 along the axial direction H2 of the first through hole is less than 0.2 mm, the thickness of the third segment 143 is too small, the connection between the third segment 143 and the second segment 142 is not stable enough, and if a relatively strong impact, collision or the like occurs, the third segment 143 is prone to break, thereby causing the first segment 141 and the second segment 142 of the upper plastic part 14 to fall off from the bending segment 122. If the size of the third segment 143 along the axial direction H2 of the first through hole is greater than 1 mm, the thickness of the third segment 143 is too large, and the space occupied is relatively large, thereby causing the volume of the entire top cover assembly 1 to be too large, which is prone to affect the installation of other components in the battery cell. Therefore, in the embodiment of the utility model, the size of the third segment 143 along the axial direction H2 of the first through hole is set to be between 0.2 mm and 1 mm, and for example, can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, so that the thickness of the third segment 143 is maintained within a reasonable range, which can not only ensure the stability of the structure of the upper plastic part 14 and reduce the probability of breakage, but also reduce the influence of the third segment 143 on other structures in the battery cell.

[0056] In an embodiment, with reference to Figure 4 and Figure 5 , the size of the second segment 142 along the radial direction H1 of the first through hole is between 0.1 mm and 1.5 mm.

[0057] If the size of the second segment 142 along the radial direction H1 of the first through hole is less than 0.1 mm, the width of the second segment 142 is too small, the second segment 142 has a poor isolation effect on the pole column 13 and the bending segment 122, and the second segment 142 is prone to be damaged under the action of an external force during use of the battery cell, thereby causing a short circuit between the pole column 13 and the welding part 12. If the size of the second segment 142 along the radial direction H1 of the first through hole is greater than 1.5 mm, the width of the second segment 142 is too large, and the space occupied is relatively large, which is prone to affect the installation of the pole column 13 and the welding part 12. Therefore, in the embodiment of the utility model, the size of the second segment 142 along the radial direction H1 of the first through hole is set to be between 0.1 mm and 1.5 mm, and for example, can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, so that the width of the second segment 142 is maintained within a reasonable range, which can not only ensure the stability of the connection between the upper plastic part 14 and the welding part 12, but also reduce the influence of the second segment 142 on other structures in the battery cell.

[0058] In an embodiment, with reference to Figure 6The welding piece 12 further comprises a bearing segment 123 connected to one end of the vertical segment 121 away from the bending segment 122, and the bearing segment 123 comprises a first end portion 1231 extending away from the second through hole 1211 and connected to the top cover 11.

[0059] The first end portion 1231 of the bearing segment 123 can be welded, bonded or clamped to the top cover 11, so that the contact area between the welding piece 12 and the top cover 11 is increased, thereby better dispersing the external force received by the welding piece 12 when encountering an external force impact, reducing stress concentration at the connection between the vertical segment 121 and the top cover 11, and making the connection of the welding piece 12 on the top cover 11 more stable.

[0060] In some embodiments, the first end portion 1231 is arranged perpendicularly to the vertical segment 121, so that when assembling the top cover assembly 1, the bearing segment 123 can serve as a positioning reference structure, so that the first end portion 1231 and the vertical segment 121 can be attached to two adjacent surfaces of the top cover 11 respectively, and the accuracy of the installation of the welding piece 12 can be determined by observing the degree of fit. It can be understood that the angle between the first end portion 1231 and the vertical segment 121 can be set according to actual needs, so that the welding piece 12 and the top cover 11 can be better connected.

[0061] In some embodiments, the first end portion 1231 is a flat plate structure, thereby reducing the difficulty of manufacturing the welding piece 12. The upper surface of the first end portion 1231 is welded to the lower surface of the top cover 11, and then the vertical segment 121 is connected to the side wall of the first through hole 111, so as to ensure the stability of the connection between the welding piece 12 and the top cover 11.

[0062] In an embodiment, referring to Figure 4 and Figure 5 The top cover assembly 1 further comprises a sealing piece 15, and the bearing segment 123 further comprises a second end portion 1232 extending towards the second through hole 1211, and the sealing piece 15 is clamped between the pole post 13 and the second end portion 1232.

[0063] The sealing piece 15 is usually made of a material with certain elasticity, such as rubber, silicone, etc., so that the pole post 13 and the second end portion 1232 can extrude the sealing piece 15, so that the internal stress of the three is maintained, and the sealing piece 15 relies on the rebound effect to maintain the sealing of the top cover assembly 1, thereby improving the safety of the battery.

[0064] In an embodiment, referring to Figure 4 The pole post 13 comprises a main body 131 and a protruding portion 132 protruding from the peripheral side surface of the main body 131, the protruding portion 132 corresponds to the bending segment 122, and the protruding portion 132 is clamped between the sealing piece 15 and the upper plastic piece 14.

[0065] At this time, the sealing member 15 is clamped between the protruding portion 132 of the pole column 13 and the second end portion 1232 of the bearing segment 123, so that insulation is maintained between the pole column 13 and the welding member 12. The protruding portion 132 and the bent segment 122 correspond, so that when the upper plastic member 14 is formed, the fluid material can flow along the side wall of the pole column 13 to the gap between the protruding portion 132 and the bent segment 122, and then form the third segment 143 in the upper plastic member 14. The bent segment 122 of the welding member 12, the third segment 143 of the upper plastic member 14, the protruding portion 132 of the pole column 13, the sealing member 15, and the bearing portion of the welding member 12 are arranged along the axial direction H2 of the first through hole, so that the third segment 143, the protruding portion 132, and the sealing member 15 are firmly locked in the welding member 12, which is connected to the top cover 11, thereby maintaining good stability of the entire top cover assembly 1.

[0066] In an embodiment, referring to Figure 4 and Figure 5 , the sealing member 15 includes a fourth segment 151, a fifth segment 152, and a sixth segment 153. The fifth segment 152 is clamped between the vertical segment 121 and the protruding portion 132. The fourth segment 151 and the sixth segment 153 are respectively connected to two ends of the fifth segment 152 along the radial direction H1 of the first through hole and extend towards the pole column 13. At least part of the protruding portion 132 is clamped between the fourth segment 151 and the sixth segment 153.

[0067] The upper and lower sides of the protruding portion 132 are both provided with the sealing member 15, that is, the fourth segment 151 and the sixth segment 153 can both provide internal stress, so that the connection between the third segment 143, the protruding portion 132, and the sealing member 15 along the axial direction H2 of the first through hole is more stable. The fifth segment 152 of the sealing member 15 is filled between the protruding portion 132 and the vertical segment 121, which reduces the gap inside the top cover assembly 1, improves the sealing performance of the top cover assembly 1, and reduces the movable space of the pole column 13 and the sealing member 15 when the battery cell is subjected to external force impact, thereby reducing the friction and collision between the pole column 13 and the sealing member 15 or other components, and improving the service life of the battery cell.

[0068] In an embodiment, referring to Figure 4 , the fourth segment 151 is connected to the third segment 143. By controlling the connection between the fourth segment 151 of the sealing member 15 and the third segment 143 of the upper plastic member 14, the gap inside the top cover assembly 1 is further reduced, thereby improving the sealing performance of the top cover assembly 1. When the top cover assembly 1 is subjected to external force, the fourth segment 151 can also provide pulling force for the movement of the upper plastic member 14, thereby further reducing the probability of the upper plastic member 14 falling off.

[0069] In an embodiment, referring to Figure 4The upper plastic part 14 includes a first top surface 144 facing away from the battery cell, and the pole 13 includes a second top surface 133 facing away from the battery cell, and along the axial direction H2 of the first through hole, the height of the first top surface 144 is lower than the height of the second top surface 133 by more than 0.3 mm.

[0070] If the distance between the first top surface 144 and the second top surface 133 is less than 0.3 mm, the distance between the first top surface 144 and the second top surface 133 is set too small, and the error of the injection molding process is large, and under the influence of the error, the height of the upper plastic part 14 has a high probability of exceeding the pole 13, so that the normal welding of the pole 13 and the tab in the subsequent process is affected. Therefore, the height difference in the embodiment of the present application is set to be more than 0.3 mm, and exemplarily can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, so that a certain distance is maintained between the first top surface 144 of the upper plastic part 14 and the second top surface 133 of the pole 13, and the probability of interference of the pole 13 is reduced.

[0071] According to a second aspect of the present application, a battery is provided, comprising: a shell; a battery cell arranged in the shell; and the top cover assembly 1 in the foregoing embodiments, wherein the top cover assembly 1 is welded to the shell to close the shell. The battery comprises the above-mentioned top cover assembly 1, so the battery has all the beneficial effects of the above-mentioned top cover assembly 1, and the embodiments of the present application will not be repeated here.

[0072] According to a third aspect of the present application, an electric device is provided, comprising the battery in the foregoing embodiments, so the electric device has all the beneficial effects of the above-mentioned battery, and the embodiments of the present application will not be repeated here. The electric device can be a vehicle, an energy storage power supply, consumer electronics, medical equipment, smart city, etc., and the present application does not make specific limitations.

[0073] The embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A top cover assembly, characterized in that, For connecting the battery cell, the top cover assembly includes: Top cover, wherein a first through hole is provided on the top cover; The welded component includes a vertical section and a bent section. The vertical section is at least partially attached to the inner wall of the first through hole, and the vertical section forms a second through hole, which corresponds to the first through hole. The bent section is connected to the end of the vertical section away from the battery cell, and the bent section extends toward the second through hole. A pole post, wherein the pole post is at least partially disposed within the second through hole and spaced apart from the weldment; and, The upper plastic part includes a first section, a second section and a third section connected in sequence. Along the radial direction of the first through hole, the second section is disposed between the pole post and the bending section. The first section and the third section are respectively connected to the two ends of the second section along the axial direction of the first through hole and extend in a direction away from the pole post. The bending section is sandwiched between the first section and the third section.

2. The top cover assembly according to claim 1, characterized in that, The dimension of the third segment along the radial direction of the first through hole is between 0.2 mm and 1.8 mm.

3. The top cover assembly according to claim 2, characterized in that, The dimension of the third segment along the axial direction of the first through hole is between 0.2 mm and 1 mm.

4. The top cover assembly according to claim 2, characterized in that, The second segment has a radial dimension between 0.1 mm and 1.5 mm along the first through hole.

5. The top cover assembly according to any one of claims 1 to 4, characterized in that, The welded component further includes a support section connected to the end of the vertical section away from the bent section, and the support section includes a first end extending away from the second through hole, the first end being connected to the top cover.

6. The top cover assembly according to claim 5, characterized in that, The top cover assembly also includes a seal, and the bearing section also includes a second end extending toward the second through hole, the seal being held between the pole and the second end.

7. The top cover assembly according to claim 6, characterized in that, The pole includes a main body and a protrusion on the peripheral side of the main body. The protrusion corresponds to the bent section and is sandwiched between the seal and the upper plastic part.

8. The top cover assembly according to claim 7, characterized in that, The sealing element includes a fourth section, a fifth section, and a sixth section. The fifth section is sandwiched between the vertical section and the protrusion. The fourth section and the sixth section are respectively connected to the two ends of the fifth section along the radial direction of the first through hole and extend toward the pole post. At least a portion of the protrusion is sandwiched between the fourth section and the sixth section.

9. The top cover assembly according to claim 8, characterized in that, The fourth segment is connected to the third segment.

10. The top cover assembly according to any one of claims 1 to 4, characterized in that, The upper plastic part includes a first top surface facing away from the battery cell, and the electrode includes a second top surface facing away from the battery cell. Along the axial direction of the first through hole, the height of the first top surface is more than 0.3 mm lower than the height of the second top surface.

11. A battery, characterized in that, include: shell; A battery cell, wherein the battery cell is disposed within the housing; and, The top cover assembly as claimed in any one of claims 1 to 10, wherein the top cover assembly is welded to the housing to close the housing.

12. An electrical appliance, characterized in that, Includes the battery as described in claim 11.

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