CN117199655A

CN117199655A - Top cap subassembly, battery cell, battery package, energy storage equipment and power consumption device

Info

Publication number: CN117199655A
Application number: CN202311468916.5A
Authority: CN
Inventors: 肖和攀
Original assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-11-07
Filing date: 2023-11-07
Publication date: 2023-12-08

Abstract

The application relates to a top cover assembly, a battery cell, a battery pack, energy storage equipment and an electric device, which comprises a pole, wherein the pole is provided with a first surface, and the first surface is arranged towards a switching piece so as to be welded with the switching piece; and the clamping ring is sleeved on the periphery of the pole and used for tightly pressing and positioning the pole, the clamping ring is provided with a second surface which is used for being arranged towards the adapter piece, a first concave part is formed at the edge of the second surface, which is close to the pole, and the height of the first concave part is lower than that of the first surface. Thereby avoid the bump to jack the transfer piece, cause the transfer piece unable with the effective laminating of first surface, appear the rosin joint problem when leading to transfer piece and utmost point post welding, also the structural design of this scheme can guarantee transfer piece and utmost point post welding quality promptly, and then help guaranteeing joint strength and the electric current transmission ability after transfer piece and the utmost point post welding, ensure the performance and the reliability of follow-up equipment fashioned lithium cell.

Description

Top cap subassembly, battery cell, battery package, energy storage equipment and power consumption device

Technical Field

The application relates to the technical field of secondary batteries, in particular to a top cover assembly, a battery cell, a battery pack, energy storage equipment and an electric device.

Background

Lithium batteries are widely used in various product fields such as new energy automobiles and electronic devices as a common secondary battery. The lithium battery is provided with a top cover assembly, the top cover assembly is generally formed by assembling parts such as a top cover plate, a pole, upper plastic, lower plastic and the like, and during installation, the pole is generally pressed by a pressing ring after penetrating through a mounting hole of the lower plastic, so that the subsequent pole and a transfer sheet are convenient to weld, and finally, a pole lug and the transfer sheet are welded and fixed, so that the circuit communication of the lithium battery is formed. However, the existing switching piece and the electrode post are easy to have the cold joint problem after being welded, so that the connection strength of the switching piece and the electrode post is low, the current transmission capability is weak, and the service performance and the reliability of the lithium battery are affected.

Disclosure of Invention

Based on this, it is necessary to provide a top cover assembly, a battery cell, a battery pack, an energy storage device and an electric device for solving the problems that the connection strength and the current transmission are affected due to the cold joint of the switching piece and the pole.

In one aspect, the present application provides a top cap assembly comprising:

a pole having a first surface and a reference surface, the first surface and the reference surface being disposed opposite each other at an interval in a height direction of the cap assembly; the method comprises the steps of,

the clamping ring is sleeved on the periphery of the pole and used for tightly pressing and positioning the pole, the clamping ring is provided with a second surface which is arranged in the same direction as the first surface, a first concave part is formed at the edge of the second surface, which is close to the pole, and the height difference between the first concave part and the reference surface is smaller than the height difference between the first surface and the reference surface.

When the top cover assembly in the scheme is assembled, the compression ring is sleeved on the periphery of the pole so as to compress the pole through the compression ring, and the pole and the adapter piece are convenient to weld; when the welding processing is carried out, the adapter piece is placed on the first surface of the pole and the second surface of the pressing ring, welding can be completed by respectively applying welding to the abutting part of the first surface and the adapter piece and the abutting part of the second surface and the adapter piece, before the welding processing is carried out on the pressing ring and the pole, as the edge part of the second surface, which is close to the pole, is provided with the first concave part, the pole is also provided with the reference surface, the reference surface and the first surface are oppositely arranged at intervals in the height direction of the top cover assembly, and the height difference between the first concave part and the reference surface is smaller than the height difference between the first surface and the reference surface, namely, the first concave part is lower than the first surface, so that after the welding head of the welding equipment acts on the first concave part to apply welding to the pressing ring and the pole, the salient point of the welding seam formed in the first concave part is still lower than the first surface, the salient point is prevented from propping up the adapter piece, the fact that the adapter piece cannot effectively adhere to the first surface, the problem of welding occurs when the adapter piece and the pole are welded, namely, the structural design of the adapter piece and the lithium battery can be connected with the lithium battery in a certain way, and the subsequent welding quality can be guaranteed, and the subsequent welding quality and the lithium battery can be guaranteed, and the subsequent welding quality can be guaranteed, and the following quality can be guaranteed, and the battery can be welded.

The technical scheme of the application is further described as follows:

in one embodiment, a height difference between the height of the first concave portion and the height of the first surface is 0.1mm to 0.3mm. The height difference range corresponds to the assembly of the compression ring and the pole with different sizes, so that the production and processing requirements of different top cover assemblies are met, meanwhile, the welding seam protruding points can be reliably guaranteed not to cause abutting interference to the adapter plate, and the welding quality of the adapter plate and the pole is guaranteed.

In one embodiment, the height of the second surface is lower than the height of the first surface, and the height difference is 0.05 mm-0.15 mm. The height of the first concave part formed on the second surface is basically ensured to be lower than that of the first surface, so that the normal and reliable implementation of the scheme is not interfered by uncertain influencing factors such as machining errors and the like.

In one embodiment, a second concave part is further formed on the first surface near the edge of the pressure ring, and the second concave part is arranged side by side with the first concave part;

the clamping ring is matched with the pole to form an annular assembly seam, the first concave part is located on the outer side of the annular assembly seam, and the second concave part is located on the inner side of the annular assembly seam. The total width of the first concave part and the second concave part is increased, so that the width of a welding seam formed by welding can also be obviously increased, thereby being beneficial to improving the welding quality and the connection strength of the compression ring and the pole; the first concave part and the second concave part are arranged on the outer side and the inner side of the annular assembly seam formed by the cooperation of the compression ring and the polar post, so that the uniform distribution of the seam can be further ensured, and the integral quality of the formed annular seam is ensured.

In one embodiment, the pressing ring is further provided with a third surface opposite to the second surface and a fourth surface positioned between the second surface and the third surface, the pole is further provided with a circumferential side surface facing the pressing ring, the circumferential side surface is concavely provided with a step part along the axial direction of the pole, the third surface is lapped on the step part, the step part comprises a side wall in the vertical direction and an abutting surface in the horizontal direction, and the pressing ring is lapped on the abutting surface so that the pressing ring compresses and positions the pole;

wherein, the circumference face, the third surface and the fourth surface cooperate to form a folded annular assembly seam. The structure mode of the compression ring for compressing and positioning the pole is simple, and no extra positioning structure or means are needed.

In one embodiment, the top cover assembly further comprises a top cover plate and an upper plastic, wherein the top cover plate is provided with a through hole, a part of the pole is penetrated in the through hole, and a part of the upper plastic is inserted between the pole and the hole wall of the through hole;

the third surface is provided with a first tooth structure, the step part is provided with a second tooth structure, and the second tooth structure is engaged with the first tooth structure in an adapting way. Can form a barrier to the flow of exhaust gas, thereby preventing the exhaust gas flow from flowing upwards to the plastic and the opposite sides of the top cover plate and the pole.

the side of the third surface facing the upper plastic exceeds the abutting surface. Can prevent waste gas from flowing out of the annular assembly seam and contacting the upper plastic and the opposite side surfaces of the top cover plate and the pole, thereby avoiding the occurrence of the problems of black smoking and short circuit of the upper plastic.

In one embodiment, the top cover assembly further comprises a lower plastic and a sealing member, a portion of the lower plastic is arranged between the top cover plate and the pressure ring in a propping mode, the sealing member is arranged between the top cover plate and the pressure ring in a sealing mode, and the sealing member is arranged between the upper plastic and the lower plastic. The insulation protection capability and the sealing performance of the top cover assembly are guaranteed.

In one embodiment, the pole has a copper layer for welding and attaching to the interposer wafer, the copper layer having a C-angle structure. The copper layer can be provided with a larger welding window, the penetration and the melting width can be made larger, and the effectiveness of connection of the pole and the adapter piece is improved.

In another aspect, the present application also provides a battery cell including the top cap assembly as described above.

In addition, the application also provides a battery pack which comprises at least one battery cell.

In addition, the application also provides energy storage equipment, which comprises the battery pack.

Finally, the present application also provides an electrical device, comprising:

an electricity consumption main body; the method comprises the steps of,

the energy storage device is characterized in that the electricity utilization main body is electrically connected with the energy storage device.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an isometric view of a cap assembly according to one embodiment.

Fig. 2 is a schematic view of a longitudinal axial section of the cap assembly of fig. 1.

Fig. 3 is a partially enlarged structural view at a in fig. 2.

Fig. 4 is a schematic view of a longitudinal axial cross-section of a header assembly according to another embodiment.

Fig. 5 is a partially enlarged schematic structural view of fig. 4 at B.

Fig. 6 is a schematic structural view of a longitudinal axial section of a cap assembly according to still another embodiment.

Fig. 7 is a partially enlarged schematic view of the structure at C in fig. 6.

Fig. 8 is a schematic view of a longitudinal axial cross-section of a cap assembly according to yet another embodiment.

Fig. 9 is a partially enlarged schematic structural view of D in fig. 8.

Reference numerals illustrate:

100. a top cover assembly; 10. a pole; 11. a first surface; 111. a second concave portion; 12. a step portion; 121. a second tooth structure; 122. a sidewall; 123. an abutment surface; 13. a copper layer; 131. a C-angle structure; 14. a peripheral side surface; 15. a reference surface; 20. a compression ring; 21. a second surface; 211. a first concave portion; 22. a third surface; 221. a boss; 222. a first tooth structure; 223. a groove; 24. a fourth surface; 30. an annular assembly seam; 31. a vertical slit section; 32. a horizontal slit section; 40. a top cover plate; 50. applying plastic; 60. lower plastic; 70. and a seal.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1-3, a top cover assembly 100 is shown according to an embodiment of the present application, which includes a pole 10, a pressure ring 20, a top cover plate 40, an upper plastic 50, a lower plastic 60, and a seal 70. The top cover plate 40 is typically an aluminum plate and functions as a load-bearing body member of the top cover assembly 100, serving to load the support pole 10, the compression ring 20, the upper plastic 50, the lower plastic 60, and the seal 70.

The top cover 40 is provided with a through hole, and a portion of the pole 10 is disposed in the through hole, for example, a column portion of the pole 10 in the present embodiment is disposed in the through hole. Specifically, the two poles 10 are respectively a positive pole and a negative pole, and correspondingly, the top cover plate 40 is provided with two through holes at intervals, and the positive pole and the negative pole respectively pass through the corresponding through holes one by one.

The part of the upper plastic 50 is inserted between the pole 10 and the wall of the through hole, and plays a role in isolating, insulating and protecting the pole 10 and the top cover plate 40. The lower plastic 60 is partially pressed between the top cover 40 and the pressing ring 20, and plays a role in isolating, insulating and protecting the top cover 40 and the pressing ring 20. The seal 70 is sealingly disposed between the top cover plate 40 and the compression ring 20, and the seal 70 is disposed between the upper and lower plastics 50, 60. The sealing member 70 may be a sealing rubber ring, etc., and can seal the assembly surface of the pressure ring 20 and the top cover plate 40, so as to prevent the leakage of the liquid flowing inside and outside.

With continued reference to fig. 3, in the present embodiment, the pole 10 has a first surface 11, and the first surface 11 is configured to be disposed towards the tab for welding with the tab; in addition, the pole 10 further has a reference surface 15, and the first surface 11 and the reference surface 15 are disposed opposite to each other at intervals in the height direction of the cap assembly 100.

The clamping ring 20 is sleeved on the periphery of the pole 10 and is used for tightly pressing and positioning the pole 10, and the clamping ring 20 is provided with a second surface 21 which is used for being arranged towards the rotating sheet, namely the second surface 21 and the first surface 11 are arranged in the same direction; the second surface 21 is formed with a first recess 211 near the edge of the pole 10, and the difference in height between the first recess 211 and the reference surface 15 is smaller than the difference in height between the first surface 11 and the reference surface 15.

With continued reference to fig. 3, implementing the technical solution of the present embodiment has the following advantages: when the top cover assembly 100 of the above-mentioned scheme is assembled, the press ring 20 is sleeved on the periphery of the pole 10 so as to press the pole 10 by the press ring 20, so that the pole 10 is convenient to weld with the adapter plate, when the welding process is performed, the adapter plate is placed on the first surface 11 of the pole 10 and the second surface 21 of the press ring 20, and the welding and fixing can be completed by respectively applying welding to the abutting part of the first surface 11 and the adapter plate and the abutting part of the second surface 21 and the adapter plate, before that, the welding process is also required to be performed on the press ring 20 and the pole 10, since the edge part of the second surface 21 close to the pole 10 is formed with the first concave part 211, the pole 10 is also provided with the reference surface 15, the reference surface 15 and the first surface 11 are oppositely arranged at intervals in the height direction of the top cover assembly 100, the height difference between the first concave portion 211 and the reference surface 15 is smaller than the height difference between the first surface 11 and the reference surface 15, that is, the first concave portion 211 is lower than the first surface 11, so that after the welding head of the welding device acts on the first concave portion 211 to apply welding to the compression ring 20 and the pole 10, the salient point of the welding seam formed in the first concave portion 211 can be ensured to be still lower than the first surface 11, thereby avoiding the situation that the salient point props against the switching piece, causing the switching piece to be unable to be effectively attached to the first surface 11, and causing the problem of cold welding when the switching piece is welded with the pole 10, that is, the structural design of the scheme can ensure the welding quality of the switching piece and the pole 10, and further be helpful to ensure the connection strength and the current transmission capability after the welding of the switching piece and the pole 10, and ensure the usability and reliability of the lithium battery formed by subsequent assembly.

For example, the first concave portion 211 in this embodiment is a circular groove that is closed in the circumferential direction, and has an L-shaped cross section. The processing preparation of the first recess 211 is thus simpler.

On the basis of the above embodiment, the height difference between the height of the first concave portion 211 and the height of the first surface 11 is 0.1mm to 0.3mm. On the one hand, this difference in height scope corresponds not unidimensional clamping ring 20 and utmost point post 10 assembly to satisfy the production and processing demand of different top cap subassemblies 100, on the other hand, this difference in height scope also can more reliably guarantee that the welding seam bump can not cause the butt to interfere the changeover piece, guarantees changeover piece and utmost point post 10 welding quality.

Alternatively, the height of the first recess 211 in this embodiment is 0.2mm below the height of the first surface 11.

Further, the height of the second surface 21 is lower than the height of the first surface 11, and the height difference is 0.05mm to 0.15mm. By designing the height of the second surface 21 to be lower than the height of the first surface 11, it is fundamentally ensured that the height of the first recess 211 formed on the second surface 21 is lower than the height of the first surface 11, and thus, no interference occurs to the normal and reliable implementation of the present solution due to uncertain influencing factors such as machining errors.

Alternatively, the height of the second surface 21 is 0.1mm lower than the height of the first surface 11 in this embodiment.

In addition, on the basis of any of the above embodiments, a second recess 111 is further formed on the first surface 11 near the edge of the pressure ring 20, and the second recess 111 is disposed side by side with the first recess 211; the annular fitting slit 30 is formed by the compression ring 20 and the pole 10, the first concave portion 211 is located outside the annular fitting slit 30, and the second concave portion 111 is located inside the annular fitting slit 30.

Specifically, the second recess 111 is an annular groove formed on the peripheral side face 14 of the pole 10, and the annular groove is L-shaped in cross section. After the compression ring 20 and the pole 10 are assembled, the bottom surfaces of the first concave part 211 and the second concave part 111 are level, so that welding is more convenient to apply.

In the welding process, the welding head of the welding apparatus can act on both the first recess 211 and the second recess 111, and since the total width of the first recess 211 and the second recess 111 is increased, the width of the weld formed by welding can also be significantly increased, thereby contributing to the improvement of the welding quality and the connection strength of the pressure ring 20 and the pole 10. And the first concave part 211 and the second concave part 111 are respectively arranged on the outer side and the inner side of the annular assembly seam 30 formed by the cooperation of the compression ring 20 and the pole 10, so that the uniform distribution of the seam can be further ensured, and the integral quality of the formed annular seam can be ensured.

With continued reference to fig. 3 to 7, in still other embodiments, the pressure ring 20 further has a third surface 22 opposite to the second surface 21, and a fourth surface 24 located between the second surface 21 and the third surface 22, the pole 10 further has a circumferential surface 14 disposed towards the pressure ring 20, the circumferential surface 14 is concavely formed with a step 12 along the axial direction of the pole 10, the step 12 includes a sidewall 122 located in the vertical direction and an abutment surface 123 located in the horizontal direction, and the pressure ring 20 overlaps the abutment surface 123, so that the pressure ring 20 compresses the pole 10 to be positioned. The structure mode of the compression ring 20 for compressing and positioning the pole 10 is simple, no extra positioning structure or means are needed, the structure composition of the top cover assembly 100 is simplified, the assembly and disassembly operations are convenient, and the manufacturing cost of the top cover assembly 100 is reduced.

Wherein the peripheral side surface 14 cooperates with the third surface 22 and the fourth surface 24 to form a folded annular assembly seam 30.

It will be readily appreciated that when welding is applied to the compression ring 20 and the pole 10, the hot-melt metal will inevitably generate waste gas (such as black smoke) which flows along the annular assembly seam 30 toward the inside of the top cover assembly 100, on one hand, the upper plastic 50 will be smoked to affect the insulation protection capability of the upper plastic 50, on the other hand, the waste gas is mixed with metal powder, which will adhere to the opposite sides of the top cover plate 40 and the pole 10 after flowing into the inside along the annular assembly seam 30, so that the short circuit problem is easily caused, therefore, the length of the waste gas flowing path can be prolonged to a certain extent by matching the peripheral side surface 14 with the third surface 22 and the fourth surface 24, the waste gas flowing potential energy can be reduced, and a certain flow blocking effect is achieved by adopting the diversion runner design to prevent or make the waste gas flow into the inside of the top cover assembly 100 as little as possible.

In order to more thoroughly and effectively block the exhaust gas generated by the welding from flowing along the annular assembly seam 30 to the opposite sides of the plastic 50, top cover 40 and pole 10, in some embodiments, the third surface 22 is provided with a first tooth formation 222 and the step 12 is provided with a second tooth formation 121, the second tooth formation 121 being adapted to engage with the first tooth formation 222.

The first tooth structure 222 is engaged with the second tooth structure 121, so that the effect of extending the exhaust gas permeation path can be achieved, and the first tooth structure 222 is engaged with the second tooth structure 121 tightly, and the exhaust gas flow can be blocked, so that the exhaust gas flow is prevented from upwards flowing to the plastic 50 and the opposite side surfaces of the top cover plate 40 and the pole 10.

With continued reference to fig. 3, 6 and 7, or alternatively to the above embodiment, the third surface 22 may be designed to protrude beyond the abutment surface 123 toward the side of the upper plastic 50.

Specifically, the third surface 22 is provided with a groove 223 facing the upper plastic 50, and the third surface is further formed with a protrusion 221 formed on one side of the groove 223 and protruding opposite to the groove 223, and the annular assembly slot 30 has a vertical slot segment 31 and a horizontal slot segment 32 which are communicated with each other. The third surface 22 is beyond the abutting surface 123 towards one side of the upper plastic 50, that is, the protruding portion 221 directly and transversely plugs the port of the horizontal slit section 32, so that exhaust gas can be prevented from flowing out of the annular assembly slit 30 to contact the upper plastic 50 and the opposite side surfaces of the top cover plate 40 and the pole 10, the upper plastic 50 is prevented from being blacked and short-circuited, and only one protruding portion 221 is needed to enable the implementation structure to be simpler, the cost to be lower, and the flow blocking reliability to be higher.

Of course, in other embodiments, means such as a sealing member 70 and a negative pressure cavity may be disposed at the fracture of the end of the horizontal slit section 32 away from the vertical slit section 31 to limit the exhaust gas from flowing out of the annular assembly slit 30, and the exhaust gas may be flexibly selected according to actual needs, which is not described herein.

With continued reference to fig. 8 and 9, in still other embodiments, the pole 10 has a copper layer 13, the copper layer 13 is used for bonding with the interposer wafer, and the copper layer 13 has a C-angle structure 131. When the adapter plate is welded with the pole 10, the pole 10 is subjected to extrusion force, especially the copper layer 13 attached to the pole 10 and the adapter plate is subjected to the extrusion force to form a C-angle structure 131, so that the copper layer 13 has a larger welding window, the penetration depth and the penetration width can be made larger, and the connection effectiveness of the pole 10 and the adapter plate is improved.

In addition, the application also provides a battery cell, which comprises a shell, an electric core and the top cover assembly 100 in any embodiment. The battery cell is installed in the shell, the top cover assembly 100 is connected with the shell in a sealing way, and the pole 10 of the top cover assembly 100 is welded with the battery cell to realize electric connection and conduction.

The battery cell consists of a positive pole piece, a negative pole piece and a diaphragm. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug.

Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate and the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the positive electrode current collector without the negative electrode active material layer protrudes out of the positive electrode current collector coated with the negative electrode active material layer, and the positive electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The separator may be made of PP (polypropylene) or PE (polyethylene). In addition, the battery cell may be a winding type structure or a lamination type structure, and the embodiment of the application is not limited thereto.

In addition, the application also provides an electricity utilization device which comprises an electricity utilization main body and energy storage equipment, wherein the electricity utilization main body is electrically connected with the energy storage equipment.

The energy storage device includes a battery pack. The battery pack includes at least two battery cells connected in series. The power-consuming body may take various forms, such as a cellular phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, and an electric tool, etc., for example, a spacecraft including an airplane, a rocket, a space plane, and a spacecraft, etc., an electric toy including a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A header assembly, comprising:

2. The header assembly of claim 1, wherein a height difference between the height of the first recess and the height of the first surface is 0.1mm to 0.3mm.

3. The header assembly of claim 1, wherein the second surface has a height that is less than the height of the first surface and a height difference of 0.05mm to 0.15mm.

4. The header assembly of claim 1, wherein the first surface is further formed with a second recess adjacent an edge of the pressure ring, the second recess being disposed side-by-side with the first recess;

the clamping ring is matched with the pole to form an annular assembly seam, the first concave part is located on the outer side of the annular assembly seam, and the second concave part is located on the inner side of the annular assembly seam.

5. The top cap assembly of claim 1, wherein the pressure ring further has a third surface disposed opposite the second surface, and a fourth surface located between the second surface and the third surface, the pole further has a peripheral side surface disposed toward the pressure ring, the peripheral side surface being concavely formed with a stepped portion along an axial direction of the pole, the stepped portion including a side wall in a vertical direction and an abutment surface in a horizontal direction, the pressure ring overlapping the abutment surface such that the pressure ring compresses the pole in place;

wherein, the circumference face, the third surface and the fourth surface cooperate to form a folded annular assembly seam.

6. The top cap assembly of claim 5, further comprising a top cap plate and an upper plastic, wherein the top cap plate is provided with a through hole, a portion of the pole is disposed through the through hole, and a portion of the upper plastic is interposed between the pole and a wall of the through hole;

the third surface is provided with a first tooth structure, the step part is provided with a second tooth structure, and the second tooth structure is engaged with the first tooth structure in an adapting way.

7. The top cap assembly of claim 5, further comprising a top cap plate and an upper plastic, wherein the top cap plate is provided with a through hole, a portion of the pole is disposed through the through hole, and a portion of the upper plastic is interposed between the pole and a wall of the through hole;

the side of the third surface facing the upper plastic exceeds the abutting surface.

8. The header assembly of claim 6 or 7, further comprising a lower plastic, a portion of the lower plastic being disposed against the top cover plate and the pressure ring, and a seal disposed between the top cover plate and the pressure ring, the seal being disposed between the upper plastic and the lower plastic.

9. The header assembly of claim 1, wherein the post has a copper layer for solder attachment to the interposer web, the copper layer being provided with a C-angle structure.

10. A battery cell comprising the cap assembly of any one of claims 1 to 9.

11. A battery pack comprising at least one cell according to claim 10.

12. An energy storage device comprising the battery pack of claim 11.

13. An electrical device, comprising:

an electricity consumption main body; the method comprises the steps of,

the energy storage device of claim 12, the power-consuming body being electrically connected to the energy storage device.