Top cover assembly, energy storage device and electric equipment

Abstract

The utility model provides a top cover assembly, an energy storage device and electric equipment. The top cover assembly comprises a top cover, a pole, a mounting sleeve and a collector plate. The top cover comprises a first side and a second side which are opposite to each other in the thickness direction, and is provided with a first through hole. The pole is arranged on the second side and covers the first through hole. The installation sleeve comprises a protruding part and comprises a first surface and a second surface which are opposite in the thickness direction, the first surface is closer to the first side of the top cover than the second surface, the second surface is sunken towards the first surface so that the protruding part can be formed on the side where the first surface is located, and a sunken space can be formed on the side where the second surface is located. The protruding part penetrates through the first through hole, and the top wall of the protruding part is connected with the bottom of the pole. At least part of the flow collecting disc is contained in the concave space, and the flow collecting disc is connected with the second surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a top cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] Energy storage devices, such as battery cells, are widely used as the main power source of electric equipment due to their recyclable characteristics. As the demand for energy storage devices gradually increases, people's requirements for their performance in all aspects are also becoming higher and higher.

[0003] However, in the assembly process of the top cover assembly of the energy storage device, the current collector plate needs to be bent twice, which challenges the assembly precision of the assembly equipment, and makes the structure of the assembly equipment more complex. The more complex the structure of the assembly equipment is, the lower the assembly stability will be, which affects the stability of mass production. On the other hand, because the current collector plate needs to be bent twice, centered and put into the shell and other processes, the multiple processes are not conducive to high-speed production, which reduces the production efficiency of the energy storage device. SUMMARY

[0004] In view of the above problems, the present application provides a top cover assembly, an energy storage device and an electric equipment.

[0005] In a first aspect, the present application provides a top cover assembly. The top cover assembly comprises a top cover, a pole, a mounting sleeve and a current collector plate. The top cover comprises a first side and a second side opposite in the thickness direction, and is provided with a first through hole. The pole is arranged on the second side and covers the first through hole. The mounting sleeve comprises a protruding portion and comprises a first surface and a second surface opposite in the thickness direction, the first surface is closer to the pole than the second surface, and the second surface is recessed towards the first surface, so as to form a protruding portion on one side where the first surface is located, and form a recessed space on one side where the second surface is located, the protruding portion passes through the first through hole, and the top wall of the protruding portion is connected with the bottom of the pole. The current collector plate is at least partially accommodated in the recessed space, and the current collector plate is connected with the second surface.

[0006] In the technical solution, the pole is connected with a part of the first surface of the mounting sleeve, i.e., the top wall of the protruding part, and the current collecting plate is at least partially accommodated in the recessed space and connected with the second surface of the mounting sleeve, so that the current collecting plate can be connected with the pole without bending. On the one hand, the recessed space can be used to position the current collecting plate, so that the current collecting plate is easily aligned with the pole, the position between the top cover assembly and the battery cell connected with the current collecting plate is accurate, the top cover assembly and the battery cell are easily assembled into the shell of the battery monomer, and the top cover assembly and the shell of the battery monomer are prevented from being scratched. On the other hand, the recessed space can provide better support and fixation for the current collecting plate, so that the structure of the top cover assembly is more stable, and the risk of deformation or damage during use is reduced. On the other hand, the current collecting plate does not need to be bent, the current collecting plate is connected with the second surface in the recessed space, the relative position between the current collecting plate and the top cover assembly is fixed, the current collecting plate is not easily pulled or compressed due to vibration of the battery cell, compared with the current collecting plate which needs to be bent, the bent part of the current collecting plate is easily pulled or compressed when the battery cell vibrates, and the bent part of the current collecting plate is easily broken, so that the service life of the current collecting plate is longer. On the other hand, the current collecting plate does not need to be bent, the risk of short circuit caused by miscontact between the current collecting plate and other elements (e.g., the top cover) of the top cover assembly is reduced, and the material of the current collecting plate is more economical, so that the production cost of the top cover assembly is reduced.

[0007] As an optional technical solution of the application, the mounting sleeve further comprises an extension part, the protruding part is protruded relative to the extension part, and a bending section is formed at the joint of the protruding part and the extension part. In the direction from the first side to the second side, the opening size of the recessed space at the bending section gradually decreases.

[0008] In the technical solution, if the mounting sleeve is subjected to an acting force in the direction from the first side to the second side, the extension part can abut against the first side, so that the mounting sleeve is prevented from being pulled and deformed.

[0009] As an optional technical solution of the application, the current collecting plate comprises a first surface and a second surface opposite to each other in the thickness direction, the first surface is closer to the first side of the top cover than the second surface, the second surface is recessed relative to the first surface, so as to form a protruding part on the side where the first surface is located and form a recessed part on the side where the second surface is located, and the protruding part is accommodated in the recessed space.

[0010] In the technical solution, the protruding part shortens the connection distance between the current collecting plate and the mounting sleeve, so that the connection between the current collecting plate, the mounting sleeve and the pole is more compact, and the risk of loose connection caused by vibration or impact during operation of the top cover assembly is reduced. In addition, the protruding part provides more space for accommodating gas inside the battery monomer, so that the battery monomer is prevented from swelling or exploding due to excessive internal pressure

[0011] As an optional technical solution of the present application, the top wall of the protruding part comprises a first part and a second part, the second part surrounds the first part, the first part is connected with the second surface, and the second part is spaced from the second surface.

[0012] In the above technical solution, the second part is spaced from the second surface, which can avoid the welding mark generated when the mounting sleeve and the current collecting disc are welded, and avoid the welding mark interfering with the mounting sleeve and affecting the fitting and connection of the mounting sleeve and the current collecting disc.

[0013] As an optional technical solution of the present application, the current collecting disc is further provided with a second through hole penetrating the first face and the second face, the current collecting disc comprises a plurality of first areas and a plurality of second areas, the plurality of first areas and the plurality of second areas are arranged alternately in sequence around the center of the protruding part, the first area is provided with the second through hole, and the first face of the second area is recessed toward the second face of the second area to form a containing groove.

[0014] In the above technical solution, the first face of the second area is recessed toward the second face of the second area to form a containing groove, which can keep a certain gap between the second face of the first area and the structure inside the energy storage device (such as the battery cell inside the battery monomer), and when the internal pressure of the energy storage device increases due to failure, the gap can provide additional space to store more gas, preventing the energy storage device from rapidly swelling and exploding. In addition, the gap can also serve as a pressure relief path for the gas. The bottom of the containing groove protrudes into the energy storage device, which can guide the gas to gather at the second through hole, so that the gas can enter the exhaust space from the second through hole. Further, the setting of the containing groove increases the distance between the first face of the second area and the lower plastic, which increases the volume of the exhaust space, and when the internal pressure of the energy storage device increases due to failure, the exhaust space can store more gas, preventing the energy storage device from rapidly swelling and exploding.

[0015] As an optional technical solution of the present application, the pole and the mounting sleeve are connected by laser welding.

[0016] In the above technical solution, the heating area of laser welding is small, so the penetration depth is small. At the same time, the welding speed is fast, and the area affected by the heating of the pole and the mounting sleeve is small, which can reduce the thermal deformation of the pole and the mounting sleeve caused by welding.

[0017] As an optional technical solution of the present application, the pole is provided with a perforation, and the perforation is used for welding the current collecting disc and the mounting sleeve.

[0018] In the above technical solution, in the case of welding the current collecting disc and the mounting sleeve, the welding equipment can extend into the pole from the perforation to weld the current collecting disc and the mounting sleeve

[0019] As an optional technical solution of the application, the top cover assembly further comprises an upper plastic, a lower plastic and a seal around the pole of the pole column. The upper plastic is installed on the second side of the top cover, and the upper plastic is clamped between the top cover and the pole. The lower plastic is installed on the first side of the top cover, and the lower plastic is clamped between the top cover and the pole. In the thickness direction of the top cover, the seal is arranged between the top cover and the pole, and in the length / radial direction of the top cover, the seal is located between the upper plastic and the lower plastic.

[0020] In the above technical solution, the upper plastic and the lower plastic have good insulation performance, which can prevent internal short circuit of the energy storage device and improve the use safety of the energy storage device. The seal is arranged between the top cover and the pole, and in the length / radial direction of the top cover, the seal is located between the pole and the lower plastic, which can provide good sealing effect, prevent internal electrolyte leakage of the battery monomer, and also prevent external moisture and impurities from entering the internal of the energy storage device.

[0021] As an optional technical solution of the application, one side of the lower plastic towards the first side is provided with a mounting protrusion, and the first side is provided with a mounting hole matched with the mounting protrusion.

[0022] In the above technical solution, the cooperation of the mounting protrusion and the mounting hole can make the assembly process between the lower plastic and the top cover more simple and direct, easy to align and position, thereby improving the assembly efficiency.

[0023] As an optional technical solution of the application, the mounting protrusion is ultrasonically welded in the mounting hole.

[0024] In the above technical solution, ultrasonic welding does not require additional welding materials such as welding wire, welding flux and the like, which can reduce the cost of the top cover assembly

[0025] In a second aspect, the application provides an energy storage device. The energy storage device comprises the top cover assembly of any one of the above embodiments.

[0026] In the technical solution, the pole is connected with a part of the first surface of the mounting sleeve, i.e., the top wall of the protruding part, the current collecting disc is at least partially accommodated in the recessed space, and the current collecting disc is connected with the second surface of the mounting sleeve, so that the current collecting disc can be connected with the pole without bending. On the one hand, the recessed space can position the current collecting disc, so that the current collecting disc is easily aligned with the pole, the position between the top cover assembly and the battery cell connected with the current collecting disc is accurate, the top cover assembly and the battery cell are easily loaded into the shell of the battery monomer, and scratching between the top cover assembly and the shell of the battery monomer is avoided. On the other hand, the recessed space can provide better support and fixation for the current collecting disc, so that the structure of the top cover assembly is more stable, and the risk of deformation or damage in the use process is reduced. On the other hand, the current collecting disc does not need to be bent, the current collecting disc is connected with the second surface in the recessed space, the relative position between the whole current collecting disc and the top cover assembly is fixed, the current collecting disc is not pulled or compressed with the vibration of the battery cell, compared with the current collecting disc that needs to be bent, the bent part of the current collecting disc is easily pulled or compressed when the battery cell vibrates, and the bent part of the current collecting disc is easily broken, so that the current collecting disc has a longer service life. On the other hand, the current collecting disc does not need to be bent, the risk of short circuit caused by the miscontact between the current collecting disc and other elements (e.g., the top cover) of the top cover assembly is reduced, and the material of the current collecting disc is more saved, so that the production cost of the top cover assembly can be saved.

[0027] In a third aspect, the application provides a power utilization device. The power utilization device comprises the energy storage device described in any of the above embodiments.

[0028] In the technical solution, the pole is connected with a part of the first surface of the mounting sleeve, i.e., the top wall of the protruding part, the current collecting disc is at least partially accommodated in the recessed space, and the current collecting disc is connected with the second surface of the mounting sleeve, so that the current collecting disc can be connected with the pole without bending. On the one hand, the recessed space can position the current collecting disc, so that the current collecting disc is easily aligned with the pole, the position between the top cover assembly and the battery cell connected with the current collecting disc is accurate, the top cover assembly and the battery cell are easily loaded into the shell of the battery monomer, and scratching between the top cover assembly and the shell of the battery monomer is avoided. On the other hand, the recessed space can provide better support and fixation for the current collecting disc, so that the structure of the top cover assembly is more stable, and the risk of deformation or damage in the use process is reduced. On the other hand, the current collecting disc does not need to be bent, the current collecting disc is connected with the second surface in the recessed space, the relative position between the whole current collecting disc and the top cover assembly is fixed, the current collecting disc is not pulled or compressed with the vibration of the battery cell, compared with the current collecting disc that needs to be bent, the bent part of the current collecting disc is easily pulled or compressed when the battery cell vibrates, and the bent part of the current collecting disc is easily broken, so that the current collecting disc has a longer service life. On the other hand, the current collecting disc does not need to be bent, the risk of short circuit caused by the miscontact between the current collecting disc and other elements (e.g., the top cover) of the top cover assembly is reduced, and the material of the current collecting disc is more saved, so that the production cost of the top cover assembly can be saved.

[0029] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application, and therefore should not be considered to narrow the scope of the present application in any way. Instead, they are included to provide illustration of the preferred embodiments of the present application. In the drawings:

[0031] Figure 1 A perspective assembly view of a top cover assembly of some embodiments of the present application is shown;

[0032] Figure 2 A perspective exploded view of the top cover assembly shown in Figure 1

[0033] Figure 3 A cross-sectional view of the top cover assembly shown in along line III-III; Figure 1

[0034] A perspective structural view of a battery cell of some embodiments of the present application is shown; Figure 4

[0035] A perspective structural view of a battery of some embodiments of the present application is shown; Figure 5

[0036] A planar structural view of an electrical device of some embodiments of the present application is shown. Figure 6 Reference signs in the detailed description of the embodiments are as follows:

[0037]

[0038] ​​Electric device 10000; battery pack 1000; battery cell 100; load 2000, 3000; conversion device 4000; top cover assembly 10; top cover 11; first side 111; mounting hole 1111; second side 113; explosion-proof valve 115; first through hole 114; mounting sleeve 12; first surface 121; second surface 122; protruding part 125; bent section 1251; recessed space 127; extension part 129; pole post 13; perforation 131; current collector plate 15; first face 151; second face 152; protruding part 153; first part 1531; second part 1532; second through hole 156; recess 157; first region 1501; second region 1502; accommodating groove 158; upper plastic 16; lower plastic 17; mounting protrusion 172; explosion-proof through hole 171; sealing member 18; explosion-proof valve 19; shell 30; battery box 300; box body 310; cover body 330. DETAILED DESCRIPTION

[0039] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore can only serve as examples, and cannot limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0041] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0042] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, mounting protrusion and mounting hole existing at the same time, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0044] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "liquid level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements.

[0047] Please refer to Figures 1 to 4 The present application provides a top cover assembly 10. The top cover assembly 10 comprises a top cover 11, a mounting sleeve 12, a pole 13 and a current collector 15. The top cover 11 comprises a first side 111 and a second side 113 opposite in the thickness direction, and is provided with a first through hole 114. The pole 13 is arranged on the second side 113 and covers the first through hole 114. The mounting sleeve 12 comprises a protruding portion 125, and comprises a first surface 121 and a second surface 122 opposite in the thickness direction, the first surface 121 is closer to the pole 13 than the second surface 122, and the second surface 122 is recessed to the first surface 121 to form the protruding portion 125 on one side where the first surface 121 is located, and to form a recessed space 127 on one side where the second surface 122 is located, the protruding portion 125 penetrates the first through hole 114, and the top wall of the protruding portion 125 is connected with the bottom of the pole 13. The current collector 15 is at least partially accommodated in the recessed space 127, and the current collector 15 is connected with the second surface 122.

[0048] Specifically, the top cover 11 is used to close the opening of the shell 30 of the battery cell 100 and provide necessary electrical connection and mechanical protection. The cross-sectional shape (the shape of the plane obtained by cutting the top cover 11 with a plane perpendicular to the thickness direction Z) of the top cover 11 can be determined according to the shape of the opening of the shell 30, i.e., the cross-sectional shape of the top cover 11 can be circular, square, polygonal, etc. For example, if the shape of the opening is circular, the corresponding cross-sectional shape of the top cover 11 can be circular; if the shape of the opening is rectangular, the corresponding cross-sectional shape of the top cover 11 can be rectangular. In this application, the top cover 11 with a circular cross-sectional shape is described, and the diameter direction of the top cover 11 is the radial direction. The first side 111 of the top cover 11 is the side inside the battery cell 100, and the second side 113 of the top cover 11 is the side in contact with the external environment. The top cover 11 is provided with a first through hole 114 penetrating the first side 111 and the second side 113 along the thickness direction Z. The mounting sleeve 12 described below can pass through the first through hole 114 to connect with the pole 13 provided on the second side 113. In the projection plane perpendicular to the thickness direction Z, the projection of the first through hole 114 is located in the projection of the top cover 11. For example, the first through hole 114 is located at the center of the top cover 11.

[0049] The pole 13 can be a positive pole 13 or a negative pole 13. The outer circuit of the battery cell 100 generally uses aluminum material to reduce cost and weight, so the connection between the battery cells 100 in the outer circuit generally uses aluminum sheets. In the internal part of the battery cell 100, the positive current collector 15 uses aluminum foil material, and the negative current collector 15 uses copper foil material, so the positive pole 13 is required to be made of aluminum material and the negative pole 13 is required to be made of copper material to ensure the use performance of the battery cell 100. According to this requirement, the positive pole 13 can be made of aluminum as a whole. The negative pole 13 can be a composite pole 13 formed by copper-aluminum composite, and the part of the negative pole 13 made of copper material is closer to the side provided with the current collector 15 to ensure the conductivity efficiency between the current collector 15, and the part of the negative pole 13 made of aluminum material is closer to the side away from the current collector 15. The price of aluminum is lower than that of copper, and the cost of the negative pole 13 formed by copper-aluminum composite is lower.

[0050] At present, the top cover assembly is a folded current collector structure, i.e., the current collector in the top cover assembly needs to be folded twice to be connected with the pole. The positions of the first folding and the second folding are relatively fixed to ensure the coaxiality of the pole and the current collector after folding, which is the deviation degree of the axis of the pole and the axis of the current collector in the thickness direction Z. If the coaxiality of the pole and the current collector is low, it will be difficult for the top cover assembly and the battery cell connected with the current collector to enter the shell of the battery cell, or when entering, the edges of the top cover will be seriously scratched with the shell, generating metal wires or causing the shell to be deformed, which affects the connection of the top cover assembly and the shell of the battery cell.

[0051] In addition, the battery cell has certain requirements for the overcurrent capacity of the current collecting disc (for example, the overcurrent capacity of the current collecting disc is required to be greater than or equal to 2C for a 50 Ah battery cell). Therefore, the width, thickness and hardness of the current collecting disc are relatively large. When the battery cell vibrates, the current collecting disc is pulled or compressed. The greater the hardness of the current collecting disc, the more likely the current collecting disc is broken due to vibration of the battery cell. The greater the hardness of the current collecting disc, the poorer the deformation ability of the current collecting disc, which indirectly leads to an increase in the difficulty of bending the current collecting disc, and the positions of primary bending and secondary bending are difficult to control and are not easy to correct. If the current collecting disc is forcibly corrected, the area of the current collecting disc connected with the tab is likely to be torn, and the tab is torn.

[0052] Based on the above problems, the mounting sleeve 12 is arranged between the current collecting disc 15 and the pole 13.

[0053] The protruding part 125 is a part of the mounting sleeve 12 penetrating the first through hole 114. The protruding part 125 protrudes in the direction from the first side 111 to the second side 113 in the thickness direction Z, so as to be close to the pole 13 and connected with the pole 13. In one example, the mounting sleeve 12 protrudes from the first side 111 to the second side 113 in the first through hole 114, that is, the first surface 121 of the mounting sleeve 12 is closer to the pole 13 than the second side 113, and the pole 13 outside the first through hole 114 is connected with the mounting sleeve 12. In another example, the mounting sleeve 12 does not protrude from the first through hole 114, that is, the second side 113 is closer to the pole 13 than the first surface 121 of the mounting sleeve 12, at least part of the pole 13 extends into the first through hole 114 and is connected with the mounting sleeve 12. Exemplarily, the side of the pole 13 close to the mounting sleeve 12 is welded with the first surface 121 of the mounting sleeve 12.

[0054] The current collecting disc 15 is arranged on the first side 111 of the top cover 11 and spaced from the top cover 11. The current collecting disc 15 is used to lead the electric energy of the battery cell inside the battery cell 100 to the positive electrode or the negative electrode of the battery cell 100, so as to realize the connection between the inside and the outside of the battery cell 100. At least part of the current collecting disc 15 can be accommodated in the recessed space 127.

[0055] The second surface 122 is recessed to the first surface 121 to form a recessed space 127 on the side where the second surface 122 is located. The shape of the projection surface of the recessed space 127 can be circular, elliptical, triangular, quadrilateral, or other polygonal, etc. In the present application, the recessed space 127 is approximately circular, thereby matching the shape of the protruding portion 153. It can be understood that in the thickness direction Z, the recessed space 127 is at least partially opposite to the protruding portion 153, so that the protruding portion 153 can be accommodated in the recessed space 127. The recessed space 127 can be one or multiple. Exemplarily, in the present application, the recessed space 127 is one and is arranged at the center of the mounting sleeve 12, that is, the recessed space 127 is arranged at the center of the projection surface of the mounting sleeve 12 perpendicular to the thickness direction Z. In the embodiment in which the recessed space 127 includes multiple, the recessed space 127 can have other arrangements.

[0056] Exemplarily, in one assembly scheme, the first surface 121 of the mounting sleeve 12 is pre-welded with the pole 13, and after the current collector plate 15 is pre-welded with the cell, the cell is inserted into the shell 30 of the battery monomer 100, and then at least part (the protruding portion 153) of the current collector plate 15 is aligned with the recessed space 127 and inserted into the recessed space 127. In this way, the current collector plate 15 can be aligned with the mounting sleeve 12 through the recessed space 127, thereby realizing the positional alignment with the pole 13. After alignment, the side of the current collector plate 15 close to the second surface 122 of the mounting sleeve 12 is connected with the second surface 122 of the mounting sleeve 12, thereby realizing the connection between the pole 13, the mounting sleeve 12 and the current collector plate 15. Thus, the current can be transmitted from the cell to the tab, then to the current collector plate 15, and then from the current collector plate 15 to the mounting sleeve 12 and then to the outside from the pole 13.

[0057] In the above technical solution, the pole column 13 is connected with a part of the first surface 121 of the mounting sleeve 12, i.e., the top wall of the protruding part 125, the current collector plate 15 is at least partially accommodated in the recessed space 127, and is connected with the second surface 122 of the mounting sleeve 12, so that the current collector plate 15 can be connected with the pole column 13 without bending. On the one hand, the recessed space 127 can be used to install and position the current collector plate 15, so that the current collector plate 15 is easily aligned with the pole column 13, the position between the top cover assembly 10 and the battery cell connected with the current collector plate 15 is accurate, the top cover assembly 10 and the battery cell are easily installed into the shell 30 of the battery monomer 100, and scratching between the top cover assembly and the shell of the battery monomer is avoided. On the other hand, the recessed space 127 can provide better support and fixation for the current collector plate 15, so that the structure of the top cover assembly 10 is more stable, and the risk of deformation or damage during use is reduced; on the other hand, the current collector plate 15 does not need to be bent, the current collector plate 15 is connected with the second surface 122 in the recessed space 127, the relative position between the current collector plate 15 and the top cover assembly 10 is fixed, the current collector plate 15 is not easily pulled or compressed due to vibration of the battery cell, compared with the current collector plate which needs to be bent, the bent part of the current collector plate is easily pulled or compressed during vibration of the battery cell, which causes the bent part of the current collector plate to be easily broken, and the service life of the current collector plate 15 is longer. On the other hand, the current collector plate 15 does not need to be bent, the risk of short circuit caused by miscontact between the current collector plate 15 and other elements (such as the top cover 11) of the top cover assembly 10 is reduced, and the material of the current collector plate 15 is more saved, so that the production cost of the top cover assembly 10 is saved.

[0058] Please refer to Figure 2 and Figure 3 As an optional technical solution of the present application, the mounting sleeve 12 further comprises an extension part 129, the protruding part 125 is protruded relative to the extension part 129, and a bending segment 1251 is formed at the joint between the protruding part 125 and the extension part 129. In the direction from the first side 111 to the second side 113, the opening size of the recessed space 127 at the bending segment 1251 gradually decreases.

[0059] Specifically, the extension part 129 surrounds the protruding part 125 and extends in the circumferential direction of the top cover 11. The extension part 129 is located in the projection plane of the first side 111 and abuts against the first side 111, so as to better fix the mounting sleeve 12. If the mounting sleeve 12 is subjected to an acting force in the direction from the first side 111 to the second side 113, the extension part 129 can abut against the first side 111, so as to avoid deformation of the mounting sleeve 12 due to pulling. In one example, the bending segment 1251 is a smooth circular arc, and in another example, the bending segment 1251 is chamfered. When a part (the protruding part 153) of the current collector plate 15 enters the recessed space 127, the bending segment 1251 can give appropriate guidance to the part of the current collector plate 15, so that the protruding part 153 is more easily guided into the recessed space 127.

[0060] It can be understood that the protruding portion 125, the bent portion 1251 and the extending portion 129 are made of electrically conductive material, including but not limited to copper, aluminum alloy, etc. In an embodiment where the mounting sleeve 12 is formed by the protruding portion 125, the bent portion 1251 and the extending portion 129, the materials for making the protruding portion 125, the bent portion 1251 and the extending portion 129 can be the same, for example, the protruding portion 125, the bent portion 1251 and the extending portion 129 are all made of aluminum alloy. The same material has similar electrical properties, and when the mounting sleeve 12 is made, there is no need to consider compatibility issues, and the process difficulty can be simplified. In another embodiment where the mounting sleeve 12 is formed by the protruding portion 125, the bent portion 1251 and the extending portion 129, the materials for making the protruding portion 125, the bent portion 1251 and the extending portion 129 can all be different, or two of them can be the same and the other one is different, so that the mounting sleeve 12 has the advantages brought by different materials. For example, the protruding portion 125 and the extending portion 129 can be made of aluminum alloy material, which is lighter in quality and can reduce the weight of the pole 13, while the bent portion 1251 is made of copper material, which has higher tensile strength and hardness, and can provide good support for the pole 13, and also can improve the mechanical strength of the extending portion 129, avoiding deformation of the mounting sleeve 12 under stress.

[0061] Please refer to Figure 2 and Figure 3 , as an optional technical solution of the present application, the current collecting plate 15 includes a first face 151 and a second face 152 opposite in the thickness direction Z, the first face 151 is closer to the first side 111 of the top cover 11 than the second face 152, and the second face 152 is recessed 157 towards the first face 151 to form a protruding portion 153 on the side where the first face 151 is located and a recessed space 157 on the side where the second face 152 is located, and the protruding portion 153 is accommodated in the recessed space 127.

[0062] Specifically, the protruding portion 153 is accommodated in the recessed space 127 and connected with the protruding portion 125, so as to realize the connection between the current collecting plate 15 and the mounting sleeve 12. The current collecting plate 15 further comprises a body portion, and the protruding portion 153 protrudes from the center portion of the body portion. In some embodiments of the present application, the protruding portion 153 is a protruding structure formed by the recess 157 of the second surface 152 of the current collecting plate 15 towards the first surface 151, that is, the protruding portion 153 and the body portion are integrally formed. In other embodiments of the present application, the protruding portion 153 can be a protruding structure arranged on the body portion and separately formed with the body portion, that is, the protruding portion 153 and the body portion are two different structures. In an example, the protruding portion 153 and the body portion can be combined together by a detachable connection mode, which includes but is not limited to a buckle connection or a threaded connection, etc. In another example, the protruding portion 153 and the body portion can be combined together by a non-detachable connection mode, which includes but is not limited to bonding or welding, etc. It can be understood that the mounting sleeve 12, the body portion and the protruding portion 153 are all made of conductive materials, which include but are not limited to copper, aluminum alloy, etc. In an embodiment in which the current collecting plate 15 is separately formed by the protruding portion 153 and the body portion, the materials for manufacturing the mounting sleeve 12, the body portion and the protruding portion 153 can be the same, for example, the mounting sleeve 12, the body portion and the protruding portion 153 are all made of aluminum alloy. The same materials have similar electrical properties, and when manufacturing the top cover assembly 10, compatibility problems do not need to be considered, and the process difficulty can be simplified. In another embodiment in which the current collecting plate 15 is separately formed by the protruding portion 153 and the body portion, the materials for manufacturing the mounting sleeve 12, the body portion and the protruding portion 153 can all be different, or two of them can be the same and the other one is different, so as to let the top cover assembly 10 have the advantages brought by different materials. For example, the mounting sleeve 12 and the body portion can be both made of aluminum alloy material, and the aluminum alloy has a relatively light weight, which can reduce the weight of the top cover assembly 10, while the protruding portion 153 is made of copper material, and the copper has a relatively high tensile strength and hardness, which can provide good support for the mounting sleeve 12 and improve the mechanical strength of the protruding portion 153, so as to avoid the deformation of the protruding portion 153 under stress.

[0063] In the above technical solution, the protruding portion 153 shortens the connection distance between the current collecting plate 15 and the mounting sleeve 12, can make the connection between the current collecting plate 15, the mounting sleeve 12 and the pole 13 more compact, and reduce the risk of connection loosening caused by vibration or impact during the working of the top cover assembly 10. In addition, the protruding portion 153 provides more space for accommodating gas inside the battery monomer 100, prevents the battery monomer 100 from swelling or explosion caused by excessive internal pressure.

[0064] Please refer to Figure 3As an optional technical solution of the present application, the top wall of the protruding portion 153 comprises a first portion 1531 and a second portion 1532, the second portion 1532 surrounds the first portion 1531, the first portion 1531 is connected with the second surface 122, and the second portion 1532 is spaced from the second surface 122.

[0065] Specifically, the top wall of the protruding portion 125 is part of the first surface 121. Exemplarily, the first portion 1531 is located at the center of the protruding portion 125 and is connected with the second surface 122. The second portion 1532 surrounds the first portion 1531. In the embodiment in which the mounting sleeve 12 and the current collector plate 15 are connected by welding, the welding will generate a certain welding mark, which will generate a certain protrusion on the second surface 122. The second portion 1532 is spaced from the second surface 122, which can avoid the welding mark generated when the mounting sleeve 12 and the current collector plate 15 are welded, so as to avoid the welding mark interfering with the mounting sleeve 12 and affecting the fit and connection of the mounting sleeve 12 and the current collector plate 15.

[0066] Please refer to Figure 2 As an optional technical solution of the present application, the current collector plate 15 is further provided with a second through hole 156 penetrating the first surface 151 and the second surface 152. The current collector plate 15 comprises a plurality of first regions 1501 and a plurality of second regions 1502, the plurality of first regions 1501 and the plurality of second regions 1502 are arranged alternately around the center of the protruding portion 125, the first region 1501 is provided with the second through hole 156, and the first surface 151 of the second region 1502 is recessed toward the second surface 152 of the second region 1502 to form a receiving groove 158.

[0067] Specifically, the current collector plate 15 can be divided into a plurality of fan-shaped regions, each of which extends outward from the center of the protruding portion 125 to the edge of the current collector plate 15. In each fan-shaped region, further comprises a first region 1501 and a second region 1502. In the present application, the current collector plate 15 is equally divided into fan-shaped regions, each of which further comprises a first region 1501 and a second region 1502. That is, the current collector plate 15 comprises a first region 1501 and a second region 1502, the first region 1501 and the plurality of second regions 1502 are arranged alternately around the center of the protruding portion 125. The areas of the first region 1501 and the second region 1502 can be the same or different. In the present application, the area of the first region 1501 is larger than that of the second region 1502, so as to provide a larger forming space for the second through hole 156. The first region 1501 is provided with the second through hole 156. In one first region 1501, the number of second through holes 156 can be one or more. In the present application, one first region 1501 contains six second through holes 156.

[0068] The first surface 151 of the second region 1502 is recessed 157 towards the second surface 152 of the second region 1502 to form a receiving groove 158. The receiving groove 158 is used to connect the tab of the battery cell. The tab can be fixed to the second region 1502 by welding or the like to achieve electrical connection between the current collector 15 and the battery cell. In the projection plane perpendicular to the thickness direction Z, the projection plane of the receiving groove 158 can be circular, elliptical, triangular, quadrilateral, or other polygonal, etc. In this application, the receiving groove 158 is approximately track-shaped. In one second region 1502, the receiving groove 158 can be one or more. In this application, one second region 1502 contains one receiving groove 158. The projection plane of the receiving groove 158 of different second regions 1502 can be the same or different.

[0069] In the above technical solution, the receiving groove 158 formed by the recess 157 of the first surface 151 of the second region 1502 towards the second surface 152 of the second region 1502 can keep a certain gap between the second surface 152 of the first region 1501 and the structure inside the energy storage device (such as the battery cell inside the battery monomer 100). When the internal pressure of the energy storage device increases due to a fault, the gap can provide additional space to store more gas, preventing the battery monomer 100 from rapidly swelling and exploding. In addition, the gap can also serve as a pressure relief path for the gas. The bottom of the receiving groove 158 protrudes towards the inside of the energy storage device, which can guide the gas to gather at the second through hole 156, so that the gas can enter the exhaust space from the second through hole 156. Further, the arrangement of the receiving groove 158 increases the distance between the first surface 151 of the second region 1502 and the lower plastic 17, which increases the volume of the exhaust space. When the internal pressure of the energy storage device increases due to a fault, the exhaust space can store more gas, preventing the energy storage device from rapidly swelling and exploding.

[0070] Please refer to Figure 2 As an optional technical solution of the present application, the pole post 13 and the mounting sleeve 12 are connected by laser welding.

[0071] Specifically, the heating area of laser welding is small, so the penetration depth is small. At the same time, the welding speed is fast, and the area affected by the heating of the pole post 13 and the mounting sleeve 12 is small, which can reduce the thermal deformation of the pole post 13 and the mounting sleeve 12 caused by welding.

[0072] Please refer to Figure 2 As an optional technical solution of the present application, the pole post 13 is provided with a perforation 131, and the perforation 131 is used to weld the current collector 15 and the mounting sleeve 12.

[0073] Specifically, the through hole 131 penetrates the pole 13 in the thickness direction Z, and in the case of the welding of the current collector plate 15 and the mounting sleeve 12, the welding equipment can extend into the pole 13 from the through hole 131 to weld the current collector plate 15 and the mounting sleeve 12. The through hole 131 can be one or more for welding the current collector plate 15 and the mounting sleeve 12. In this application, the through hole 131 is one. Exemplarily, the through hole 131 is located at the center of the pole 13, so as to facilitate the welding of the current collector plate 15 and the mounting sleeve 12 at the center of the pole 13, and the welding position at the center can also make the welding of the current collector plate 15 and the mounting sleeve 12 be evenly stressed and not easy to be torn.

[0074] Referring to Figure 2 and Figure 3 , as an optional technical solution of the application, the top cover assembly 10 further comprises an upper plastic 16, a lower plastic 17, and a sealing member 18 surrounding the pole body of the pole 13. The upper plastic 16 is installed on the second side 113 of the top cover 11, and the upper plastic 16 is clamped between the top cover 11 and the pole 13. The lower plastic 17 is installed on the first side 111 of the top cover 11, and the lower plastic 17 is clamped between the top cover 11 and the pole 13. In the thickness direction Z of the top cover 11, the sealing member 18 is arranged between the top cover 11 and the pole 13, and in the length / radial direction of the top cover 11, the sealing member 18 is located between the upper plastic 16 and the lower plastic 17.

[0075] Specifically, the upper plastic 16 and the lower plastic 17 are both components for providing insulation function in the top cover assembly 10. The upper plastic 16 and the lower plastic 17 can be made of the same insulating material, or can be made of different insulating materials respectively. The insulating material includes but is not limited to polypropylene, polyethylene, polyvinylidene fluoride, or polycarbonate, etc.

[0076] In the above technical solution, the upper plastic 16 and the lower plastic 17 have good insulation performance, which can prevent internal short circuit of the energy storage device and improve the use safety of the energy storage device. In the thickness direction Z of the top cover 11, the sealing member 18 is arranged between the top cover 11 and the pole 13, and in the length / radial direction of the top cover 11, the sealing member 18 is located between the pole body and the lower plastic 17, which can provide good sealing effect, prevent the internal electrolyte of the battery monomer 100 from leaking, and also prevent external moisture and impurities from entering the internal energy storage device.

[0077] Referring to Figure 2 and Figure 3 , as an optional technical solution of the application, one side of the lower plastic 17 facing the first side 111 is provided with a mounting protrusion 172, and the first side 111 is provided with a mounting hole 1111 matched with the mounting protrusion 172.

[0078] Specifically, the cooperation between the mounting protrusion 172 and the mounting hole 1111 can make the assembly process between the lower plastic 17 and the top cover 11 simpler and more direct, and easy to align and position, thereby improving assembly efficiency. The mounting protrusion 172 can be one or more. Exemplarily, the mounting protrusion 172 of the present application is 2. In the plane cut by the plane perpendicular to the thickness direction Z, the cross-sectional area of ​​the mounting protrusion 172 can be the same everywhere, or partially different, or all different. In another embodiment, the lower plastic 17 is provided with a mounting hole 1111 on a side facing the first side 111, and the first side 111 is provided with a mounting protrusion 172 that cooperates with the mounting hole 1111.

[0079] See also Figure 3 As an optional technical solution of the present application, the mounting protrusion 172 is ultrasonically welded in the mounting hole 1111.

[0080] Specifically, in one example, the mounting protrusion 172 and the mounting hole 1111 can be connected together using a detachable connection method, which includes but is not limited to a snap connection or a threaded connection. In another example, the mounting protrusion 172 and the mounting hole 1111 can be connected together using a non-detachable connection method, which includes but is not limited to bonding or welding. Furthermore, in an embodiment in which welding is used between the mounting protrusion 172 and the mounting hole 1111, the welding method is ultrasonic welding. Ultrasonic welding does not require additional welding materials such as welding wire, flux, etc., which can reduce the cost of the top cover assembly 10.

[0081] Furthermore, as an optional technical solution of the present application, an explosion-proof valve 19115 is provided on the top cover 11, and an explosion-proof through-hole 171 is provided on the lower plastic 17. The explosion-proof valve 19115 covers the explosion-proof through-hole 171. When gas is generated inside the energy storage device due to a fault, the gas flows from the interior of the energy storage device to the gap between the collecting plate 15 and the structure inside the energy storage device. The gap serves as a pressure relief path for the gas, and the gas converges and concentrates. When a certain pressure is reached, the gas can flow out of the explosion-proof through-hole 171 and break through the explosion-proof valve 19115 to relieve pressure, thereby preventing the energy storage device from exploding due to rapid expansion.

[0082] See also Figures 2 to 5 The present application provides an energy storage device, which includes a top cover assembly 10 .

[0083] Specifically, the energy storage device can be a single battery cell or a battery pack 1000 composed of one or more battery cells 100, and the energy storage device can be used for energy storage, energy scheduling, and energy storage power station, but is not limited thereto. Specifically, in some applications, the energy storage device can convert electrical energy into chemical energy for storage to meet the electricity demand during the peak period of energy demand, thereby playing the role of energy storage. In other applications, the energy storage device can flexibly adjust the supply and demand of electrical energy to achieve energy balance and scheduling, thereby improving energy utilization and playing the role of energy scheduling. In still other applications, the energy storage device can be composed of an energy storage power station to store and schedule energy on a large scale and provide reliable energy supply, thereby playing the role of an energy storage power station.

[0084] Referring to Figure 5 When the energy storage device is a battery pack 1000 composed of a plurality of battery cells 100, the battery pack 1000 includes the battery cells 100 and a battery box 300. The battery cell 100 is the smallest unit for storing and releasing electrical energy. The battery pack 1000 can store and release energy by connecting and controlling the battery cells 100. The plurality of battery cells 100 can be connected in series, in parallel, or in a mixed connection, wherein the mixed connection means that the plurality of battery cells 100 are connected in series and in parallel. The plurality of battery cells 100 can be directly connected in series, in parallel, or in a mixed connection, and the plurality of battery cells 100 are accommodated in a carrier (for example, the battery box 300). The battery pack 1000 can also include other structures, for example, the battery pack 1000 can also include a busbar component (not shown) for realizing the electrical connection between the plurality of battery cells 100. It can be understood that the number of battery cells 100 in the battery pack 1000 can be adaptively adjusted according to the application scenario and the capacity.

[0085] Referring to Figure 4 The battery cell 100 includes a top cover assembly 10, a shell 30, and an electrode core (not shown). The shell 30 is provided with an opening, and the top cover assembly 10 is mounted on the shell 30 and closes the opening. The electrode core is accommodated in the shell 30. The shell 30 is a structure for loading the electrode core. The cross section (a plane obtained by cutting the shell 30 in a thickness direction Z) of the shell 30 can be, but is not limited to, circular, elliptical, square, or other polygonal. The material of the shell 30 includes, but is not limited to, metal or non-metal, wherein the metal includes aluminum, iron, steel, aluminum alloy, or iron alloy, and the non-metal includes, but is not limited to, plastic, etc. In this application, the cross section of the shell 30 is circular, which facilitates the integration of the cylindrical battery cell 100. The material of the shell 30 is aluminum alloy, which can make the battery cell 100 lighter and more convenient to transport while ensuring rigidity.

[0086] The electric cell is a core structure in the battery monomer 100 for realizing conversion between electric energy and chemical energy through chemical reaction for charging and discharging. The electric cell is generally made by winding an electrode assembly on a core rod. The electrode assembly mainly includes a negative electrode sheet, a positive electrode sheet, and a separator. In one possible design, the negative electrode sheet, the separator, and the positive electrode sheet are sequentially stacked, and are adhered to the core rod by means of adhesive or hot melting, and then are wound to form the electric cell. The electric cell has a gap after being formed, and electrolyte can enter the electric cell through the gap. The electrolyte is used for impregnating the electric cell to ensure that ions can freely move during charging and discharging of the electric cell. The electrolyte includes, but is not limited to, electrolyte lithium salt, organic solvent, and additives. The negative electrode sheet includes a negative current collector 15 (for example, a copper foil) and a negative active material layer (for example, carbon or silicon) coated on the surface of the negative current collector 15. The positive electrode sheet includes a positive current collector 15 (for example, an aluminum foil) and a positive active material layer (for example, a ternary material, lithium iron phosphate, or lithium cobaltate) coated on the surface of the positive current collector 15. The separator is located between adjacent negative electrode sheets and positive electrode sheets, and is used for separating the negative electrode sheets and the positive electrode sheets.

[0087] The battery box 300 is a structure for placing the battery monomer 100. The cross section (a plane obtained by cutting a plane perpendicular to the thickness direction Z) of the battery box 300 can be, but is not limited to, circular, elliptical, square, or other polygonal. The material of the battery box 300 includes, but is not limited to, metal or non-metal, wherein the metal includes aluminum, iron, steel, aluminum alloy, or iron alloy, and the non-metal includes, but is not limited to, plastic. In this application, the cross section of the battery box 300 is rectangular. The material of the battery box 300 is aluminum alloy, so that the battery pack 1000 is lighter and more convenient to transport while ensuring strength.

[0088] The battery box 300 includes a box body 310 and a cover body 330. The box body 310 and the cover body 330 are combined and surround a containing cavity, and the battery monomer 100 is contained in the containing cavity. The box body 310 is a component of the battery box 300 for loading and supporting the battery monomer 100, one end of the box body 310 is closed, and the other end is provided with an opening for loading the battery monomer 100 into the containing cavity. The cover body 330 is a component of the battery box 300 for covering the opening. The connection between the box body 310 and the cover body 330 can be detachable connection or non-detachable connection. The detachable connection includes, but is not limited to, screw connection, clamping connection, or a combination of screw connection and clamping connection. The non-detachable connection includes, but is not limited to, adhesive connection, welding, or a combination of adhesive connection and welding. In this application, the box body 310 and the cover body 330 are detachably connected.

[0089] In addition, in the case that the battery box 300 includes the box body 310 and the cover body 330, the battery box 300 can be made of one kind of material, for example, the box body 310 and the cover body 330 are made of the same material, both of which are aluminum alloy. The battery box 300 can also be made of different materials for different parts. For example, the box body 310 is made of a metal material, and the cover body 330 is made of plastic. Of course, the material of the box body 310 and the material of the cover body 330 can also be other combinations of different materials, which are not listed here.

[0090] In the above technical solutions, the pole 13 in the energy storage device is connected with a part of the first surface 121 of the mounting sleeve 12, that is, the top wall of the convex part 125, the current collecting disc 15 is at least partially accommodated in the recessed space 127, and is connected with the second surface 122 of the mounting sleeve 12, so that the current collecting disc 15 can be connected with the pole 13 without bending. On the one hand, the recessed space 127 can be used to position the current collecting disc 15, so that the current collecting disc 15 is easy to align with the pole 13, the position between the top cover assembly 10 and the battery cell connected with the current collecting disc 15 is accurate, which is beneficial to the assembly of the top cover assembly 10 and the battery cell into the shell 30 of the battery monomer 100, and can avoid scratching between the top cover assembly 10 and the shell 30 of the battery monomer 100. On the other hand, the recessed space 127 can provide better support and fixation for the current collecting disc 15, so that the structure of the top cover assembly 10 is more stable, and the risk of deformation or damage in use is reduced; on the other hand, the current collecting disc 15 does not need to be bent, the current collecting disc 15 is connected with the second surface 122 in the recessed space 127, the relative position between the current collecting disc 15 and the top cover assembly 10 is fixed, and the current collecting disc 15 will not be pulled or compressed due to vibration of the battery cell. Compared with the current collecting disc 15 which needs to be bent, the bent part of the current collecting disc 15 is easy to be pulled or compressed when the battery cell vibrates, which causes the bent part of the current collecting disc 15 to be easy to break, and the service life of the current collecting disc 15 is longer. On the other hand, the current collecting disc 15 does not need to be bent, which can reduce the risk of short circuit caused by the miscontact between the current collecting disc 15 and other elements (for example, the top cover 11) of the top cover assembly 10, and the material of the current collecting disc 15 is more saved, so that the production cost of the top cover assembly 10 can be saved.

[0091] Please refer to Figure 2 , Figure 5 and Figure 6 , the application provides a kind of electric equipment 10000. Electric equipment 10000 includes energy storage device.

[0092] Further, the application also provides electric equipment 10000 using energy storage device as power supply. Electric equipment 10000 can include but not limited to electric tool, mobile phone, ship, spacecraft or household energy storage system and so on. Among them, spacecraft can include unmanned aerial vehicle, rocket, space shuttle and the like. The application only takes electric equipment 10000 as household energy storage system for example to explain.

[0093] The household energy storage system includes an energy storage device (for example, the battery pack 1000), a conversion device 4000 (a photovoltaic panel), a user load 2000 (a street lamp), another user load 3000 (a household appliance), and the conversion device 4000. The energy storage device can be installed on an outdoor wall in a wall-mounted manner. Specifically, the conversion device 4000 can be a photoelectric conversion device 4000 and is installed on a roof for converting light energy into electrical energy. The energy storage device is used to store the electrical energy and supply the street lamp and the household appliance during a peak electricity price period, or supply power during a power grid outage, or supply power to the power grid after being connected to the power grid. It should be noted that the energy storage device of the present application is not limited to the household energy storage scenario.

[0094] In the power consumption device 10000, the pole 13 is connected to a part of the first surface 121 of the mounting sleeve 12, i.e., the top wall of the protruding part 125, the current collector plate 15 is at least partially accommodated in the recessed space 127, and is connected to the second surface 122 of the mounting sleeve 12, so that the current collector plate 15 can be connected to the pole 13 without bending. On the one hand, the recessed space 127 can be used to position the current collector plate 15, so that the current collector plate 15 is easily aligned with the pole 13, the position between the top cover assembly 10 and the battery cell connected to the current collector plate 15 is accurate, which is beneficial to the assembly of the top cover assembly 10 and the battery cell into the shell 30 of the battery monomer 100, and prevents the top cover assembly 10 and the shell 30 of the battery monomer 100 from being scratched. On the other hand, the recessed space 127 can provide better support and fixation for the current collector plate 15, so that the structure of the top cover assembly 10 is more stable, and the risk of deformation or damage during use is reduced; on the other hand, the current collector plate 15 does not need to be bent, and the relative position between the current collector plate 15 and the top cover assembly 10 is fixed by connecting the current collector plate 15 to the second surface 122 in the recessed space 127, so that the current collector plate 15 is not pulled or compressed due to vibration of the battery cell. Compared with the current collector plate 15 that needs to be bent, the bent part of the current collector plate 15 is easily pulled or compressed during vibration of the battery cell, which causes the bent part of the current collector plate 15 to be easily broken, and the current collector plate 15 of the present application has a longer service life. On the other hand, the current collector plate 15 does not need to be bent, which can reduce the risk of short circuit caused by the miscontact between the current collector plate 15 and other elements (for example, the top cover 11) of the top cover assembly 10, and the material of the current collector plate 15 of the present application is more economical, thereby saving the production cost of the top cover assembly 10.

[0095] It should be noted that the above-mentioned embodiments are only used to explain the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cap assembly, characterized by, The top cover includes a first side and a second side opposite to each other in a thickness direction, and is provided with a first through hole; the pole is arranged on the second side and covers the first through hole; the mounting sleeve includes a protruding portion and a first surface and a second surface opposite to each other in the thickness direction, the first surface is closer to the pole than the second surface, and the second surface is recessed towards the first surface to form a protruding portion on a side where the first surface is located and a recessed space on a side where the second surface is located, the protruding portion passes through the first through hole, and a top wall of the protruding portion is connected to a bottom of the pole; and the current collector plate is at least partially accommodated in the recessed space and connected to the second surface. The mounting sleeve further includes an extension portion, the protruding portion is protruded relative to the extension portion, a bending section is formed at a joint of the protruding portion and the extension portion, and an opening size of the recessed space at the bending section gradually decreases in a direction from the first side to the second side. The current collector plate includes a first surface and a second surface opposite to each other in the thickness direction, the first surface is closer to the first side of the top cover than the second surface, and the second surface is recessed towards the first surface to form a protruding portion on a side where the first surface is located and a recess on a side where the second surface is located, and the protruding portion is accommodated in the recessed space.

2. The roof assembly of claim 1, wherein, The top wall of the protruding portion includes a first portion and a second portion surrounding the first portion, the first portion is connected to the second surface, and the second portion is spaced apart from the second surface.

3. The roof assembly of claim 1, wherein, The current collector plate is further provided with a second through hole penetrating the first surface and the second surface, the current collector plate includes a plurality of first regions and a plurality of second regions, the plurality of first regions and the plurality of second regions are arranged alternately in sequence around a center of the protruding portion, the second through hole is arranged in the first region, and the first surface of the second region is recessed towards the second surface of the second region to form an accommodation groove.

4. The roof assembly of claim 3, wherein, 6. The top cover assembly according to claim 1, wherein 5. The roof assembly of claim 3, wherein, the pole and the mounting sleeve are connected by laser welding; and / or the pole is provided with a perforation for welding the current collector plate and the mounting sleeve. The top cover assembly further includes an upper plastic installed on the second side of the top cover, the upper plastic being clamped between the top cover and the pole; 7. The cap assembly of any one of claims 1-6, wherein, a lower plastic installed on the first side of the top cover, the lower plastic being clamped between the top cover and the pole; and a sealing member surrounding a pole body of the pole, the sealing member being arranged between the top cover and the pole in a thickness direction of the top cover and being located between the upper plastic and the lower plastic in a length / radial direction of the top cover. One side of the lower plastic facing the first side is provided with a mounting protrusion, and the first side is provided with a mounting hole matched with the mounting protrusion. The mounting protrusion is ultrasonically welded in the mounting hole.

8. The roof assembly of claim 7, wherein, The energy storage device includes the top cover assembly according to any one of claims 1-9.

9. The roof assembly of claim 8, wherein, The electric equipment includes the energy storage device according to claim 10.

10. An energy storage device, characterized by, ​ 11. An electrical device, characterized by ​

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