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 collector plate and a pole. The top cover comprises a first side and a second side which are opposite in the thickness direction. The flow collecting disc is arranged on the first side of the top cover and comprises a first face and a second face which are opposite in the thickness direction, the first face is closer to the first side of the top cover than the second face, and the flow collecting disc is provided with a first through hole penetrating through the first face and the second face. The pole penetrates through the top cover and the first through hole and protrudes relative to the first side and the second side, a bent part is arranged at one end, close to the second surface, of the pole, and the bent part penetrates through the first through hole and is connected with the second surface.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a top cover assembly, an energy storage device, and an electrical device. Background Art

[0002] Energy storage devices, such as battery cells, are widely used as the primary power source for electrical devices due to their recyclable properties. As the demand for energy storage devices continues to grow, so too are the demands on their performance in all aspects.

[0003] However, during the assembly of the top cover assembly of the energy storage device, the collecting plate needs to be bent twice, which poses a challenge to the assembly accuracy of the assembly equipment and makes the structure of the assembly equipment more complicated. The more complicated the structure of the assembly equipment, the lower its assembly stability will be, affecting the stability of mass production. On the other hand, because the collecting plate requires multiple processes such as two bendings, centering and shell insertion, the large number of processes is not conducive to high-speed production, which reduces the production efficiency of the energy storage device. Utility Model Content

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

[0005] In a first aspect, the present application provides a top cover assembly. The top cover assembly includes a top cover, a current collecting plate and a pole. The top cover includes a first side and a second side opposite to each other in the thickness direction. The current collecting plate is provided on the first side of the top cover, and the current collecting 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 current collecting plate is provided with a first through hole that passes through the first surface and the second surface. The pole is provided through the top cover and the first through hole, and protrudes relative to both the first side and the second side. The pole is provided with a bent portion at one end close to the second surface, and the bent portion passes through the first through hole and is connected to the second surface.

[0006] In the above technical solution, the pole passes through the first through-hole through the bending portion and is connected to the second side of the current collecting disc, so that the current collecting disc can be connected to the pole without bending. On the one hand, the bending portion can provide better support and fixation for the second side, making the structure of the top cover assembly more stable and reducing the risk of deformation or damage during use; on the other hand, the reduction of the bending process of the current collecting disc is conducive to the high-speed production of the top cover assembly and improves the production efficiency of the top cover assembly. On the other hand, the current collecting disc does not need to be bent, so compared with the current collecting disc that needs to be bent, the current collecting disc of the present application is more material-saving, thereby saving the production cost of the top cover assembly. On the other hand, the current collecting disc does not need to be bent, which can reduce the risk of short circuit caused by accidental contact between the current collecting disc and other components of the top cover assembly (such as the top cover).

[0007] As an optional technical solution of the present application, the thickness of the bent portion is greater than the thickness of the collecting plate.

[0008] In the above technical solution, the thickness of the bent portion is greater than that of the collector plate, which improves the structural strength of the bent portion and makes it less likely to deform under external forces, thereby improving the connection strength between the bent portion and the collector plate. The thickness of the bent portion is greater than that of the collector plate, which means that the collector plate does not need to be thicker to ensure connection strength, thereby reducing the material usage of the collector plate and saving the cost of the top cover assembly.

[0009] As an optional technical solution of the present application, the pole includes a pole body, a clamping portion, and the bent portion. The pole body passes through the top cover and protrudes relative to both the first side and the second side. The two opposite sides of the clamping portion are respectively connected to the pole body and the bent portion, and are located between the top cover and the first surface. The bent portion is provided with a thinned region at one end away from the clamping portion, and the thickness of the thinned region is less than the thickness of other areas on the bent portion.

[0010] In the above technical solution, the clamping portion is located between the top cover and the first surface of the current collecting plate, making it difficult for the clamping portion to be pulled out of the top cover by external forces, thereby improving the stability of the connection between the terminal and the top cover. The thickness of the thinned area is thinner than that of other areas on the bent portion, which can reduce the volume of the terminal and thus reduce the space occupied by the battery. When the internal pressure of the battery increases, more space is provided to store gas, thereby improving the safety performance of the battery and preventing the battery from swelling or explosion due to excessive internal pressure.

[0011] As an optional technical solution of the present application, the cross-sectional area of ​​the thinned region gradually decreases in a direction away from the central axis of the pole.

[0012] In the above technical solution, the gradually decreasing cross-sectional area of ​​the thinned region reduces the volume of the terminal and the space occupied by the battery interior. This improves the battery's gas storage capacity and provides more space for gas storage when the internal pressure of the battery increases, thereby improving battery safety and preventing bulging or explosion caused by excessive internal pressure. Furthermore, the gradually decreasing cross-sectional area of ​​the thinned region creates a certain guiding angle, which facilitates the positioning of the bent portion during connection with the second surface.

[0013] As an optional technical solution of the present application, the second surface is recessed relative to the first surface, so as to form a raised portion on the side where the first surface is located, and a recessed portion on the side where the second surface is located. The first through hole is provided in the raised portion, and the top wall of the raised portion is connected to the bottom of the clamping portion.

[0014] In this technical solution, the raised portion shortens the distance between the collector plate and the terminal, creating a more compact connection between the collector plate, the clamping portion, and the top cover. This reduces the risk of loosening due to vibration or impact during operation of the top cover assembly. Furthermore, the recessed portion provides more space for gas inside the battery, preventing bulging or explosion caused by excessive internal pressure.

[0015] As an optional technical solution of the present application, the bent portion is accommodated in the recess and is spaced apart from the inner side wall of the recess in the radial direction of the collecting plate.

[0016] In the above technical solution, the space between the bent portion and the inner sidewall of the recess provides a certain amount of redundant space for the connection between the bent portion and the second surface, preventing the bent portion from squeezing the inner sidewall of the recess during the connection process. If the bent portion is deformed radially toward the collector disc by external forces, the recess prevents the bent portion from squeezing the inner sidewall of the recess, causing deformation of the recess. Furthermore, the recess provides a space for gas to accumulate within the battery, preventing bulging or explosion caused by excessive internal pressure.

[0017] As an optional technical solution of the present application, a spacer is formed on the first surface protruding away from the second surface, and the spacer is higher than the protruding portion.

[0018] In the above technical solution, a spacer is formed on the first surface protruding away from the second surface, and the spacer is higher than the protrusion. When the air pressure inside the energy storage device is large and impacts the current collecting disc, the spacer can support the lower plastic of the top cover assembly. On the one hand, the spacer can provide a support point for the lower plastic, thereby improving the installation stability of the lower plastic. On the other hand, the spacer can ensure that there is always an exhaust space for gas circulation between the first surface of the current collecting disc and the lower plastic, thereby preventing the gas from being unable to flow to the explosion-proof valve and unable to achieve pressure relief. On the other hand, when the top cover assembly is subjected to external forces due to impact or extrusion, the spacer can support the lower plastic and prevent the lower plastic from being deformed. At the same time, the spacer can withstand most of the external forces, thereby preventing the external forces from being concentratedly transmitted to the protrusion, thereby causing the electrical connection between the protrusion and the pole to fail.

[0019] As an optional technical solution of the present application, the spacers are evenly distributed around the center of the raised portion.

[0020] In the above technical solution, the spacers are evenly distributed around the center of the raised portion, more evenly distributing external forces, preventing localized force concentration on the collector plate, thereby reducing the risk of localized cracking or deformation. The evenly distributed spacers also provide more uniform and comprehensive support for the lower plastic, thereby improving the assembly stability of the entire top cover assembly. The even distribution of the spacers also simplifies the manufacturing process, reducing the complexity of the process.

[0021] As an optional technical solution of this application, the current collecting plate further comprises a second through-hole extending through the first and second surfaces. The current collecting plate comprises a plurality of first regions and a plurality of second regions. These first regions and second regions are alternately arranged around the center of the raised portion. The first regions are provided with the spacer and the second through-hole, and the first surfaces of the second regions are recessed toward the second surfaces of the second regions to form a receiving groove.

[0022] In the above technical solution, the accommodating groove formed by the depression of the first surface of the second zone toward the second surface of the second zone can maintain a certain gap between the second surface of the first zone and the internal structure of the energy storage device (such as the battery cell in the battery cell). When the air pressure inside the energy storage device increases due to a fault, the gap can provide additional space to store more gas, thereby preventing the battery from rapidly swelling and exploding. In addition, the gap can also serve as a pressure relief path for the gas. The bottom of the accommodating groove protrudes toward the interior of the energy storage device, which can guide the gas to converge at the second through hole, so that the gas can enter the exhaust space from the second through hole. Furthermore, the provision of the accommodating groove increases the distance between the first surface of the second zone and the lower plastic, that is, increases the volume of the exhaust space. When the air pressure inside the energy storage device increases due to a fault, the exhaust space can store more gas, thereby preventing the energy storage device from rapidly swelling and exploding. In addition, the second through hole and the spacer are both in the first zone, so the distance between the second through hole and the spacer is small. Even if the exhaust space partially collapses due to external force, the spacer can still support a certain space around the second through hole for gas to flow to the explosion-proof valve, thereby achieving the purpose of pressure relief and improving the safety of the energy storage device.

[0023] As an optional technical solution of the present application, the cross-section of the protrusion obtained by a plane along the thickness direction of the top cover is a trapezoid that is smaller at the top and larger at the bottom.

[0024] In the above technical solution, when the top cover assembly is subjected to forces due to impact or extrusion, the trapezoidal shape can more evenly distribute the forces. In particular, when subjected to forces in the thickness direction, the wider side of the trapezoid can provide a larger support area, thereby reducing the forces per unit area. In addition, when the trapezoid is subjected to oblique forces (i.e., forces at a certain angle to the thickness direction Z), the hypotenuse of the trapezoid can provide support, preventing cross-sectional distortion caused by the forces, thereby preventing distortion and deformation of the raised portion, and ensuring the stability of the electrical connection between the raised portion and the terminal.

[0025] As an optional technical solution of the present application, a positioning notch is provided on the outer periphery of the collecting plate.

[0026] In the above technical solution, during the assembly of the top cover assembly, the positioning notch provides a clear positioning point for the collecting plate, which facilitates the installation of the collecting plate and increases the assembly speed of the top cover assembly. The positioning notch has a specific shape compared to the outer periphery of the collecting plate, which can help the collecting plate to achieve precise alignment during the installation process and ensure that the collecting plate is installed in the correct position in the top cover assembly. In addition, the positioning notch can also serve as a gas pressure relief channel. When the air pressure inside the energy storage device increases due to a fault, the gas can also enter the exhaust space above the collecting plate from the positioning notch, thereby preventing the energy storage device from rapidly expanding and exploding.

[0027] As an optional technical solution of the present application, the top cover assembly also includes an upper plastic, a lower plastic, a pressure block and a seal surrounding the column of the pole. The upper plastic is installed on the first 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 second 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 and / or radial direction of the top cover, the seal is located between the column and the lower plastic. The pressure block is installed on the first side of the top cover, and the pressure block is clamped between the pole and the upper plastic.

[0028] In the above technical solution, the upper and lower plastics have excellent insulation properties, preventing short circuits within the energy storage device and improving its safety. A seal is provided between the top cover and the flange of the terminal, providing a good seal to prevent leakage of electrolyte within the energy storage device and also to prevent external moisture and impurities from entering the device. A pressure block is provided between the terminal and the upper plastic, enhancing the fastening force between the terminal and the upper plastic and preventing the terminal from loosening.

[0029] As an optional technical solution of the present application, the collecting plate and the bent portion are riveted; and / or the pressing block and the pole are riveted.

[0030] In the above technical solution, the collecting plate and the bent portion are riveted, which can improve the connection strength between the collecting plate and the bent portion. The collecting plate and the bent portion, the pressure block and the pole are all riveted, which can simplify the assembly process and improve assembly efficiency.

[0031] As an optional technical solution of this application, the top cover is provided with an explosion-proof hole, and the lower plastic is provided with a through-hole. The explosion-proof through-hole is connected to the corresponding explosion-proof hole. In the thickness direction of the top cover, the explosion-proof through-hole is staggered with the spacer on the collecting plate. The top cover assembly also includes an explosion-proof valve, which is mounted on the top cover and covers the explosion-proof hole.

[0032] In the above technical solution, when the gas pressure inside the energy storage device increases due to a fault, gas flows from the energy storage device into the gap between the collecting tray and the internal structure of the energy storage device. This gap serves as a pressure relief path for the gas, guiding the gas to converge at the explosion-proof through-holes in the collecting tray. The gas then enters the exhaust space above the collecting tray through the explosion-proof through-holes, where it converges and concentrates. When a certain pressure is reached, the gas can flow out of the explosion-proof through-holes, then burst out of the explosion-proof holes, breaking through the explosion-proof valve to relieve pressure and prevent the energy storage device from exploding due to rapid expansion. The explosion-proof through-holes are staggered from the spacer on the collecting tray to prevent the spacer from occupying the space near the explosion-proof through-holes and thus preventing obstruction of the gas path to the explosion-proof valve.

[0033] As an optional technical solution of the present application, in the direction from the first side of the top cover to the second side of the top cover, the outer contour size of the lower plastic first remains unchanged and then gradually decreases.

[0034] In the above technical solution, the outer contour of the lower plastic remains unchanged at first and then gradually decreases to form a guide angle. During the assembly of the energy storage device, the guide angle can reduce interference between the lower plastic and other components, facilitating the correct installation of the lower plastic into the top cover assembly.

[0035] In a second aspect, the present application provides an energy storage device, which includes the top cover assembly described in any one of the above embodiments.

[0036] In the above technical solution, the pole passes through the first through-hole through the bending portion and is connected to the second surface of the current collecting disc, so that the current collecting disc can be connected to the pole without bending. On the one hand, the bending portion can provide better support and fixation for the current collecting disc, making the structure of the top cover assembly more stable and reducing the risk of deformation or damage during use; on the other hand, the reduction of the current collecting disc bending process is conducive to the high-speed production of the top cover assembly and improves the production efficiency of the top cover assembly. On the other hand, the current collecting disc does not need to be bent, so compared with the current collecting disc that needs to be bent, the current collecting disc of the present application is more material-saving, thereby saving the production cost of the top cover assembly. On the other hand, the current collecting disc does not need to be bent, which can reduce the risk of short circuit caused by accidental contact between the current collecting disc and other components of the top cover assembly (such as the top cover).

[0037] In a third aspect, the present application provides an electrical device comprising the energy storage device described in any one of the above embodiments.

[0038] In the above technical solution, the pole of the electrical equipment passes through the first through-hole through the bending portion and is connected to the second surface of the current collecting disc, so that the current collecting disc can be connected to the pole without bending. On the one hand, the bending portion can provide better support and fixation for the current collecting disc, making the structure of the top cover assembly more stable and reducing the risk of deformation or damage during use; on the other hand, the reduction of the current collecting disc bending process is conducive to the high-speed production of the top cover assembly and improves the production efficiency of the top cover assembly. On the other hand, the current collecting disc does not need to be bent, so compared with the current collecting disc that needs to be bent, the current collecting disc of the present application is more material-saving, thereby saving the production cost of the top cover assembly. On the other hand, the current collecting disc does not need to be bent, which can reduce the risk of short circuit caused by accidental contact between the current collecting disc and other components of the top cover assembly (such as the top cover).

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 This is a schematic three-dimensional assembly diagram of a top cover assembly according to some embodiments of the present application;

[0042] Figure 2 for Figure 1 An exploded perspective view of the top cover assembly shown;

[0043] Figure 3 for Figure 1 A schematic cross-sectional view of the top cover assembly along line III-III is shown;

[0044] Figure 4 for Figure 1 A schematic cross-sectional view of the top cover assembly along line III-III is shown;

[0045] Figure 5 for Figure 1 A schematic plan view of the structure of the collecting plate in the top cover assembly is shown;

[0046] Figure 6 Schematic diagram of the three-dimensional structure of a battery cell in some embodiments of the present application;

[0047] Figure 7Schematic diagram of the three-dimensional structure of batteries according to some embodiments of the present application;

[0048] Figure 8 This is a schematic diagram of the planar structure of electrical equipment in some embodiments of the present application.

[0049] The accompanying drawings in the specific implementation manner are as follows:

[0050] Power-consuming device 10000; battery pack 1000; battery cell 100; loads 2000 and 3000; conversion device 4000;

[0051] Top cover assembly 10; top cover 11; first side 111; second side 113; explosion-proof hole 115; pole 13; pole body 131; snap-fit ​​portion 133; bend 135; thinned area 1351; pressure block 14; collecting plate 15; first surface 151; second surface 152; raised portion 153; spacer 154; first through hole 155; second through hole 156; recess 157; first area 1501; second area 1502; accommodating groove 158; positioning notch 159; upper plastic 16; lower plastic 17; explosion-proof through hole 171; seal 18; explosion-proof valve 19; shell 30; battery box 300; box body 310; box body 330. DETAILED DESCRIPTION

[0052] The following embodiments of the technical solution of the present application are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0054] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0055] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "liquid level", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0059] In the description of the implementation methods of the present application, unless otherwise clearly stipulated and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0060] See also Figures 1 to 3The present application provides a top cover assembly 10. The top cover assembly 10 includes a top cover 11, a pole 13 and a current collecting plate 15. The top cover 11 includes a first side 111 and a second side 113 opposite to each other in the thickness direction Z. The current collecting plate 15 is provided on the first side 111 of the top cover 11. The current collecting plate 15 includes a first surface 151 and a second surface 152 opposite to each other in the thickness direction Z. The first surface 151 is closer to the first side 111 of the top cover 11 than the second surface 152. The current collecting plate 15 is provided with a first through hole 155 that passes through the first surface 151 and the second surface 152. The pole 13 is provided in the top cover 11 and the first through hole 155, and protrudes relative to the first side 111 and the second side 113. A bending portion 135 is provided at one end of the pole 13 close to the second surface 152. The bending portion 135 passes through the first through hole 155 and is connected to the second surface 152.

[0061] Specifically, the top cover 11 is used to close the housing 30 ( Figure 6 ) and provide the necessary electrical connections and mechanical protection. The shape of the cross section of the top cover 11 (the plane cut by a plane perpendicular to the thickness direction Z) can be determined according to the shape of the opening of the shell 30, that is, the cross-sectional shape of the top cover 11 can be a variety of shapes such as 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. Among them, this application is described with the top cover 11 having a circular cross-sectional shape, and the diameter direction of the top cover 11 is radial. The first side 111 of the top cover 11 is the side arranged inside the battery cell 100, and the second side 113 of the top cover 11 is the side in contact with the external environment.

[0062] The collecting plate 15 is provided on the first side 111 of the top cover 11 and is spaced apart from the top cover 11. The collecting plate 15 is used to lead the electric energy of the battery cells inside the battery cell 100 outward to the positive or negative electrode of the battery cell 100, thereby realizing the connection between the internal and external circuits of the battery cell 100. The collecting plate 15 is provided with a first through hole 155, and the bending portion 135 can pass through the first through hole 155. When the pole 13 and the collecting plate 15 are connected, the bending portion 135 is bent after passing through the first through hole 155, thereby connecting the bent portion of the bending portion 135 to the second surface 152 to fix the pole 13 and the collecting plate 15. The first through hole 155 can be circular, triangular, quadrilateral or polygonal, and is not limited in this application. It can be understood that the position of the first through hole 155 corresponds to the position of the pole 13.

[0063] In the above technical solution, the pole 13 passes through the first through-hole 155 through the bending portion 135 and is connected to the second surface 152 of the current collecting disc 15, so that the current collecting disc 15 can be connected to the pole 13 without bending. On the one hand, the bending portion 135 can provide better support and fixation for the current collecting disc 15, making the structure of the top cover assembly 10 more stable and reducing the risk of deformation or damage during use; on the other hand, the reduction of the bending process of the current collecting disc 15 is conducive to the high-speed production of the top cover assembly 10 and improves the production efficiency of the top cover assembly 10. On the other hand, the current collecting disc 15 does not need to be bent, so compared with the current collecting disc 15 that needs to be bent, the current collecting disc 15 of the present application saves more material, thereby saving the production cost of the top cover assembly 10. 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 accidental contact between the current collecting disc 15 and other components of the top cover assembly 10 (such as the top cover 11).

[0064] See also Figure 4 As an optional technical solution of the present application, the thickness of the bent portion 135 is greater than the thickness of the collecting plate 15 .

[0065] In the above technical solution, the thickness of the bent portion 135 is greater than the thickness of the current collecting tray 15, which can improve the structural strength of the bent portion 135 and make the bent portion 135 less likely to deform under external forces, thereby improving the connection strength between the bent portion 135 and the current collecting tray 15. Furthermore, it can be understood that while thickening the bent portion 135 can improve the connection strength, the current collecting tray 15 does not need to be thicker to maintain the connection strength. Therefore, the thickness of the bent portion 135 is greater than the thickness of the current collecting tray 15, which can reduce the material usage of the current collecting tray 15 and save the cost of the top cover assembly 10.

[0066] See also Figures 3 to 5 As an optional technical solution of the present application, the pole 13 includes a pole body 131, a clamping portion 133, and a bent portion 135. The pole body 131 passes through the top cover 11 and protrudes relative to both the first side 111 and the second side 113. The opposite sides of the clamping portion 133 are respectively connected to the pole body 131 and the bent portion 135, and are located between the top cover 11 and the first surface 151. A thinned region 1351 is provided at one end of the bent portion 135 away from the clamping portion 133. The thickness of the thinned region 1351 is less than the thickness of other areas on the bent portion 135.

[0067] Specifically, in the thickness direction Z, the pole 13 can be divided into a pole body 131, a clamping portion 133 and a bent portion 135. The pole body 131 passes through a through hole on the top cover 11, and the clamping portion 133 is clamped between the top cover 11 and the current collecting plate 15. It can be understood that, in the projection of the thickness direction Z, the outer contour of the through hole is located within the outer contour of the clamping portion 133. As a result, the clamping portion 133 is not easily pulled out of the top cover 11 by external force, thereby improving the connection strength between the pole 13 and the top cover 11. In some embodiments of the present application, the pole body 131, the clamping portion 133 and the bent portion 135 are an integrally formed structure. In other embodiments of the application, the clamping portion 133 and the bent portion 135 can be a protruding structure provided on the pole body 131 and formed separately from the pole body 131. That is, the clamping portion 133 and the bent portion 135 are different structures from the pole body 131. In one example, the clamping portion 133 and the bent portion 135 can be joined to the pole body 131 using a removable connection, including but not limited to a snap-fit ​​connection or a threaded connection. In another example, the clamping portion 133 and the bent portion 135 can be joined to the pole body 131 using a non-removable connection, including but not limited to bonding or welding. It is understood that the clamping portion 133, the bent portion 135, and the pole body 131 are all made of conductive materials, including but not limited to copper, aluminum alloy, and the like. In an embodiment in which the current collecting plate 15 is formed separately from the clamping portion 133, the bent portion 135, and the pole body 131, the clamping portion 133, the bent portion 135, and the pole body 131 can be made of the same material, for example, aluminum alloy. Identical materials have similar electrical properties, eliminating the need to consider compatibility issues when manufacturing the pole 13, simplifying the manufacturing process. In another embodiment in which the pole 13 is formed separately from the clamping portion 133 and the bent portion 135 and the pole body 131, the materials used to make the clamping portion 133, the bent portion 135, and the pole body 131 can all be different, or two of them can be the same and the other different, thereby allowing the pole 13 to have the advantages of different materials. For example, the clamping portion 133 and the bent portion 135 can both be made of an aluminum alloy, which is lightweight and can reduce the weight of the pole 13, while the pole body 131 can be made of copper, which has high tensile strength and hardness, providing good support for the pole 13 and improving the mechanical strength of the pole body 131, thereby preventing deformation of the pole body 131 under stress.

[0068] In the above technical solution, the clamping portion 133 is located between the top cover 11 and the first surface 151 of the current collecting tray 15. This prevents the clamping portion 133 from being pulled out of the top cover 11 by external forces, thereby improving the connection strength between the pole 13 and the top cover 11. Furthermore, the clamping portion 133 is provided on the first surface 151 of the current collecting tray 15, and the bent portion 135 is provided on the second surface 152 of the current collecting tray 15, providing two support surfaces for the current collecting tray 15. When the pole 13 is subjected to a force from the second surface 152 toward the first surface 151, the side of the clamping portion 133 close to the top cover 11 can provide support force to prevent the pole 13 from being pulled out under the force. The connection between the bent portion 135 and the second surface 152 can also provide support force to prevent the pole 13 from being pulled out under the force. When the pole 13 is subjected to a force from the first surface 151 toward the second surface 152, the area of ​​the clamping portion 133 is larger than the area of ​​the first through hole 155. Therefore, the clamping portion 133 can disperse the force acting around the first through hole 155, thereby preventing the first through hole 155 from deforming. The thickness of the thinned area 1351 is smaller than the thickness of other areas on the bent portion 135, which can reduce the volume of the pole 13 and reduce the occupation of the internal space of the battery cell 100, thereby improving the gas storage capacity of the battery cell 100, and providing more space to store gas when the internal air pressure of the battery cell 100 increases, thereby improving the safety performance of the battery cell 100 and preventing the battery cell 100 from swelling or exploding due to excessive internal pressure.

[0069] See also Figures 3 to 5 As an optional technical solution of the present application, the cross-sectional area of ​​the thinning region 1351 gradually decreases in the direction away from the central axis of the pole 13.

[0070] In the above technical solution, the cross-sectional area of ​​the thinned region 1351 gradually decreases, which can reduce the volume of the terminal 13 and the space occupied by the internal battery cell 100. This improves the gas storage capacity of the battery cell 100 and provides more space for gas storage when the internal pressure of the battery cell 100 increases, thereby improving the safety performance of the battery cell 100 and preventing the battery cell 100 from bulging or exploding due to excessive internal pressure. In addition, the gradually decreasing cross-sectional area of ​​the thinned region 1351 can form a certain guiding angle, which facilitates the positioning of the bent portion 135 during the connection (e.g., riveting) with the second surface 152.

[0071] See also Figures 3 to 5 As an optional technical solution of the present application, the second surface 152 is recessed toward the first surface 151 to form a raised portion 153 on the side where the first surface 151 is located, and a recess 157 on the side where the second surface 152 is located. A first through hole 155 is provided in the raised portion 153, and the top wall of the raised portion 153 is connected to the bottom of the engaging portion 133.

[0072] The raised portion 153 is used to connect the current collecting plate 15 to the pole 13. The current collecting plate 15 also includes a main body, with the raised portion 153 protruding from the center of the main body. In some embodiments of the present application, the raised portion 153 is a raised structure formed by recessing the second surface 152 of the current collecting plate 15 toward the first surface 151. That is, the raised portion 153 and the main body are integrally formed. In other embodiments of the present application, the raised portion 153 may be a raised structure provided on the main body and formed separately from the main body. That is, the raised portion 153 and the main body are two different structures. In one example, the raised portion 153 and the main body can be connected together using a removable connection, including but not limited to a snap-fit ​​connection or a threaded connection. In another example, the raised portion 153 and the main body can be connected together using a non-removable connection, including but not limited to bonding or welding. It is understood that the pole 13, the main body, and the raised portion 153 are all made of conductive materials, including but not limited to copper and aluminum alloys. In one embodiment where the current collecting disc 15 is formed from the raised portion 153 and the main body, the pole 13, the main body, and the raised portion 153 can be made of the same material. For example, the pole 13, the main body, and the raised portion 153 can all be made of aluminum alloy. Identical materials have similar electrical properties, eliminating the need to consider compatibility issues when manufacturing the top cover assembly 10, simplifying the manufacturing process. In another embodiment where the current collecting disc 15 is formed from the raised portion 153 and the main body, the pole 13, the main body, and the raised portion 153 can all be made of different materials, or two of them can be the same and one different, allowing the top cover assembly 10 to take advantage of the advantages of different materials. For example, the pole 13 and the main body can both be made of aluminum alloy, which is lightweight and can reduce the weight of the top cover assembly 10. The raised portion 153 can be made of copper, which has high tensile strength and hardness, providing good support for the pole 13 and improving the mechanical strength of the raised portion 153, preventing deformation under stress.

[0073] In the above technical solution, raised portion 153 shortens the connection distance between collecting plate 15 and terminal 13, making the connection between collecting plate 15, clamping portion 133, and top cover 11 more compact, reducing the risk of loosening due to vibration or impact during operation of top cover assembly 10. Furthermore, raised portion 153 provides more space for gas inside battery cell 100, preventing bulging or explosion of battery cell 100 due to excessive internal pressure.

[0074] See also Figures 3 to 5 As an optional technical solution of the present application, the bent portion 135 is accommodated in the recess 157 and is spaced apart from the inner side wall of the recess 157 in the radial direction of the collecting plate 15 .

[0075] Specifically, the bent portion 135 is spaced apart from the inner sidewall of the recess 157 in the radial direction of the current collecting plate 15 , that is, the outer contour dimension of the bent portion 135 is smaller than the inner contour dimension of the protruding portion.

[0076] In the above technical solution, the gap between the bent portion 135 and the inner sidewall of the recess 157 provides a certain amount of redundant space for the connection between the bent portion 135 and the second surface. This prevents the bent portion 135 from squeezing the inner sidewall of the recess 157 during the connection process. Furthermore, when the bent portion 135 is deformed radially toward the current collecting plate 15 by an external force, this prevents the bent portion 135 from squeezing the inner sidewall of the recess 157, causing deformation of the recess 157. Furthermore, the recess 157 provides a space for gas to remain within the battery, preventing the battery cell 100 from bulging or exploding due to excessive internal pressure.

[0077] See also Figure 2 and Figure 5 As an optional technical solution of the present application, the second surface 152 protrudes away from the first surface 151 to form a spacer 154, and the spacer 154 is higher than the protrusion 153.

[0078] Specifically, the spacer 154 supports the structure located on the side of the first surface 151 of the current collecting tray 15. For example, the spacer 154 supports the top cover 11 located on the side of the first surface 151 of the current collecting tray 15. In the present application, a lower plastic 17 is provided between the top cover 11 and the current collecting tray 15, and the spacer 154 is higher than the raised portion 153. Therefore, the spacer 154 supports the lower plastic 17. The outer contour of the top wall of the spacer 154 can be circular, elliptical, triangular, quadrilateral, or other polygonal. There can be one or more spacers 154. When there are multiple spacers 154, the top wall shapes of the multiple spacers 154 can be the same, partially different, or all different, and this is not limited in the present application. In some embodiments of the present application, the spacer 154 is a raised structure integrally formed with the main body. In other embodiments of the present application, the spacer 154 can be a raised structure provided on the main body and formed separately from the main body. That is, the spacer 154 and the main body are two different structures. In one example, the spacer 154 and the main body can be connected together using a detachable connection method, including but not limited to a snap connection or a threaded connection. In another example, the spacer 154 and the main body can be connected together using a non-detachable connection method, including but not limited to bonding or welding. In addition, the spacer 154 can be a solid structure or a hollow structure, without limitation.

[0079] When the raised portion 153 and the main body are formed separately, since the spacer 154 is in contact with the lower plastic 17, and the lower plastic 17 itself is an insulating material, the spacer 154 can be made of a conductive material or a non-conductive material. Conductive materials include but are not limited to copper, aluminum alloy, etc., and non-conductive materials include but are not limited to polypropylene (PP), polyethylene (PE), polyvinylidene fluoride (PVDF) or polycarbonate (PC), etc. In an embodiment in which the raised portion 153 and the main body are formed separately, the materials used to make the spacer 154 and the main body can be the same. For example, the main body and the spacer 154 are both made of aluminum alloy. The same materials have similar electrical properties. When making the top cover assembly 10, there is no need to consider compatibility issues, which can simplify the process difficulty. In another embodiment, the materials used to make the main body and the spacer 154 can be different, so that the top cover assembly 10 has the advantages brought by different materials. For example, the main body can be made of aluminum alloy material, which is lightweight and can reduce the weight of the top cover assembly 10, while the spacer 154 is made of copper material, which has high tensile strength and hardness, can provide good support for the lower plastic 17, and can also improve the mechanical strength of the spacer 154 to prevent the spacer 154 from being deformed by force.

[0080] In the above technical solution, the first surface 151 protrudes away from the second surface 152 to form a spacer 154, and the spacer 154 is higher than the raised portion 153. When the air pressure inside the energy storage device is high and impacts the collecting tray 15, the spacer 154 can support the lower plastic 17 of the top cover assembly 10. On the one hand, the spacer 154 can provide a support point for the lower plastic 17, improving the installation stability of the lower plastic 17. On the other hand, the spacer 154 can ensure that there is always an exhaust space for gas to flow between the first surface 151 of the collecting tray 15 and the lower plastic 17, preventing the gas from being unable to flow to the explosion-proof valve 19 and achieving pressure relief. On the other hand, when the top cover assembly 10 is subjected to external forces due to impact or extrusion, the spacer 154 can support the lower plastic 17 and prevent the lower plastic 17 from deforming. At the same time, the spacer 154 can withstand most of the external force, preventing the external force from being concentratedly transmitted to the protrusion 153 and causing the electrical connection between the protrusion 153 and the pole 13 to fail.

[0081] See also Figure 2 and Figure 5 As an optional technical solution of the present application, the spacers 154 are evenly distributed around the center of the raised portion 153 .

[0082] Specifically, when there are multiple spacers 154, the spacers 154 are evenly distributed around the center of the protrusion 153. In one example, the spacers 154 are distributed in an annular shape, that is, the circumferential spacing between the multiple spacers 154 is equal, and they are respectively located on a certain circumference with the center of the protrusion 153 as the center. In another example, the spacers 154 are distributed in multiple annular shapes, and the multiple rings are distributed in concentric circles with the center of the protrusion 153 as the center. In another example, the spacers 154 are distributed according to fan-shaped areas, the area of ​​each fan-shaped area is equal, and the spatial distribution of the spacers 154 within the fan-shaped area is the same. In addition, there are other cases of uniform distribution, which are not listed here one by one.

[0083] In the above technical solution, the spacers 154 are evenly distributed around the center of the raised portion 153. This allows the spacers 154 to more evenly distribute the external forces transmitted, preventing localized force concentration on the collecting tray 15 and thus reducing the risk of localized cracking or deformation. The even distribution of the spacers 154 also enables the collecting tray 15 to provide more uniform and comprehensive support for the lower plastic 17, thereby improving the assembly stability of the entire top cover assembly 10. The even distribution of the spacers 154 also simplifies the manufacturing process of the spacers 154, reducing the manufacturing complexity.

[0084] See also Figure 2 and Figure 5 As an optional technical solution of the present application, the current collecting tray 15 further includes a second through-hole 156 extending through the first surface 151 and the second surface 152. The current collecting tray 15 includes 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 alternately arranged around the center of the raised portion 153. The first regions 1501 are provided with a spacer 154 and a second through-hole 156. The first surface 151 of the second regions 1502 is recessed toward the second surface 152 of the second regions 1502 to form a receiving groove 158.

[0085] Specifically, the collecting tray 15 can be divided into multiple sector-shaped areas, each of which extends roughly outward from the center of the raised portion 153 to the edge of the collecting tray 15. Each sector-shaped area further includes a first area 1501 and a second area 1502. In the present application, the collecting tray 15 is equally divided into six sector-shaped areas, each of which further includes a first area 1501 and a second area 1502. That is, the collecting tray 15 includes six first areas 1501 and six second areas 1502, with the first area 1501 and multiple second areas 1502 arranged alternately in sequence around the center of the raised portion 153. The areas of the first area 1501 and the second area 1502 can be the same or different. In the present application, the area of ​​the first area 1501 is larger than that of the second area 1502, thereby providing a larger space for the spacer 154 and the second through hole 156 to form. The spacer 154 and the second through hole 156 are provided within the first area 1501. In a first zone 1501, the number of spacers 154 may be one or more, and the number of second through holes 156 may be one or more. The number of spacers 154 may be the same as or different from the number of second through holes 156. In the present application, a first zone 1501 contains one spacer 154 and two second through holes 156. The centers of the spacer 154 and the second through holes 156 are triangularly distributed, so that the space of the first zone 1501 can be fully utilized. In a first zone 1501, in the projection plane perpendicular to the thickness direction Z, the projected area of ​​the spacer 154 may be greater than, equal to, or less than the projected area of ​​the second through hole 156, and is not limited here. In the present application, the projected area of ​​the spacer 154 is greater than the projected area of ​​a single second through hole 156, thereby ensuring the supporting role of the spacer 154.

[0086] The first surface 151 of the second zone 1502 is recessed toward the second surface 152 of the second zone 1502 to form a receiving groove 158. In a projection plane perpendicular to the thickness direction Z, the shape of the projected surface of the receiving groove 158 can be circular, elliptical, triangular, quadrilateral, or other polygonal. In the present application, the receiving groove 158 is generally runway-shaped. Within a second zone 1502, there can be one or more receiving grooves 158. In the present application, a second zone 1502 includes one receiving groove 158. The projected shapes of the receiving grooves 158 in different second zones 1502 can be the same or different.

[0087] Please combine Figure 5In the above technical solution, 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. This allows a certain gap to be maintained between the second surface 152 of the first region 1501 and the internal structures of the energy storage device (e.g., the battery cells within the battery cell 100). When the internal pressure of the energy storage device increases due to a fault, the gap provides additional space to store more gas, preventing the battery from rapidly expanding and exploding. Furthermore, the gap also serves as a pressure relief path for gas. The bottom of the receiving groove 158 protrudes toward the interior of the energy storage device, guiding the gas to converge at the second through-hole 156, allowing the gas to enter the exhaust space from the second through-hole 156. Furthermore, the provision of the receiving groove 155 increases the distance between the first surface 151 of the second region 1502 and the lower plastic 17, thereby increasing 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 expanding and exploding. In addition, the second through hole 156 and the spacer 154 are both located in the first zone 1501, so the distance between the second through hole 156 and the spacer 154 is small. Even if the exhaust space partially collapses due to external force, the spacer 154 can still support a certain space around the second through hole 156 for gas to flow to the explosion-proof valve 19, thereby achieving the purpose of pressure relief and improving the safety of the energy storage device.

[0088] See also Figure 2 As an optional technical solution of the present application, a positioning notch 159 is provided on the outer periphery of the collecting plate 15 .

[0089] Specifically, the positioning notch 159 is used to position the collecting plate 15 when it is installed. The shape of the positioning notch 159 can be a sector, a semi-ellipse, a triangle, a quadrilateral, or other polygonal shape. There can be one or more positioning notches 159. The shapes of the multiple positioning notches 159 can be the same or different.

[0090] In the above technical solution, during the assembly process of the top cover assembly 10, the positioning notch 159 provides a clear positioning point for the collecting plate 15, which facilitates the installation of the collecting plate 15 and improves the assembly speed of the top cover assembly 10. The positioning notch 159 has a specific shape compared to the outer periphery of the collecting plate 15, which can help the collecting plate 15 to achieve precise alignment during the installation process and ensure that the collecting plate 15 is installed in the correct position in the top cover assembly 10. In addition, the positioning notch 159 can also serve as a gas pressure relief channel. When gas is generated due to a fault inside the energy storage device, the gas can also enter the exhaust space above the collecting plate 15 from the positioning notch 159, thereby preventing the energy storage device from rapidly expanding and exploding.

[0091] See also Figure 2 and Figure 4As an optional technical solution of the present application, the top cover assembly 10 further includes an upper plastic 16, a lower plastic 17, and a seal 18 surrounding the column of the pole 13. The upper plastic 16 is mounted on the first side 111 of the top cover 11 and is sandwiched between the top cover 11 and the pole 13. The lower plastic 17 is mounted on the second side 113 of the top cover 11 and is sandwiched between the top cover 11 and the pole 13. In the thickness direction Z of the top cover 11, the seal 18 is disposed between the top cover 11 and the pole 13. In the lengthwise and / or radial direction of the top cover 11, the seal 18 is located between the column 135 and the lower plastic 17.

[0092] Specifically, the upper plastic 16 and the lower plastic 17 are both components in the top cover assembly 10 for providing insulation function. The upper plastic 16 and the lower plastic 17 can be made of the same insulating material, or they can be made of different insulating materials. Insulating materials include but are not limited to polypropylene, polyethylene, polyvinylidene fluoride or polycarbonate. The top cover assembly 10 also includes a pressing block 14, which is arranged between the upper plastic 16 and the pole 13 to fix the pole 13. The pressing block 14 is installed on the first side, and the pressing block 14 is clamped between the pole 13 and the upper plastic 16, which can increase the fastening force between the pole 13 and the upper plastic 16 and prevent the pole 13 from loosening.

[0093] In the above technical solution, the upper plastic 16 and lower plastic 17 have excellent insulation properties, which can prevent internal short circuits in the energy storage device and improve the safety of the energy storage device. In the thickness direction Z of the top cover 11, the seal 18 is provided between the top cover 11 and the terminal 13. In the longitudinal and / or radial direction of the top cover 11, the seal 18 is located between the column 135 and the lower plastic 17. This provides a good sealing effect, preventing the leakage of electrolyte inside the battery cell 100, and also preventing external moisture and impurities from entering the energy storage device.

[0094] See also Figure 3 and Figure 4 As an optional technical solution of the present application, the collecting plate 15 is riveted to the bent portion 135 ; and / or the pressing block 14 is riveted to the pole 13 .

[0095] In the above technical solution, the collecting plate 15 and the bent portion 135 are riveted, which can improve the connection strength between the collecting plate 15 and the bent portion 135. The collecting plate 15 and the bent portion 135, the pressing block 14 and the pole 13 are all riveted, which can simplify the assembly process and improve assembly efficiency.

[0096] See also Figure 2As an optional technical solution of this application, the top cover 11 is provided with an explosion-proof hole 115, and the lower plastic 17 is provided with an explosion-proof through-hole 171. The explosion-proof through-hole 171 is connected to the explosion-proof hole 115. In the thickness direction Z of the top cover 11, the explosion-proof through-hole 171 is offset from the spacer 154 on the collecting plate 15. The top cover assembly 10 also includes an explosion-proof valve 19, which is mounted on the top cover 11 and covers the explosion-proof hole 115.

[0097] Specifically, the explosion-proof hole 115 can be in various shapes such as circular, elliptical, triangular, quadrilateral or other polygonal shapes.

[0098] In the above technical solution, when gas is generated within 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 within the energy storage device. The gap serves as a pressure relief path for the gas, guiding the gas to converge at the second through hole 156 of the collecting plate 15. The gas then enters the exhaust space above the collecting plate 15 through the second through hole 156. The gas converges and concentrates in the exhaust space. When a certain pressure is reached, the gas can flow out of the explosion-proof through hole 171, then rush out of the explosion-proof hole 115, and break through the explosion-proof valve 19 to relieve pressure, preventing the energy storage device from exploding due to rapid expansion. The explosion-proof through hole 171 is staggered from the spacer on the collecting plate 15, which can prevent the spacer from occupying the space near the explosion-proof through hole 171 and avoid obstruction on the path of the gas to the explosion-proof valve 19.

[0099] See also Figure 2 As an optional technical solution of the present application, in the direction from the first side 111 of the top cover 11 to the second side 113 of the top cover 11, the outer contour size of the lower plastic 17 remains unchanged at first and then gradually decreases.

[0100] In the above technical solution, the outer dimensions of the lower plastic 17 remain unchanged at first and then gradually decrease to form a guide angle. During the assembly of the energy storage device, the guide angle can reduce interference between the lower plastic 17 and other components, facilitating the correct positioning of the lower plastic 17 in the top cover assembly 10.

[0101] See also Figure 2 、 Figure 6 、 Figure 7 and Figure 8 The present application provides an energy storage device, which includes the top cover assembly 10 described in any one of the embodiments.

[0102] Specifically, the energy storage device can be a single battery 100, or a battery pack 1000 composed of one or more battery cells 100. The functions of the energy storage device include but are not limited to energy storage, energy scheduling and energy storage power stations. Specifically, in some applications, the energy storage device can convert electrical energy into chemical energy for storage to meet the electricity demand during peak energy demand periods, thereby playing the role of energy storage. In other applications, the energy storage device can flexibly adjust the supply and demand of electrical energy, achieve energy balance and scheduling, and improve energy utilization, thereby playing the role of energy scheduling. In some other applications, the energy storage device can form an energy storage power station to store energy and schedule energy on a large scale, provide a reliable energy supply, and thus play the role of an energy storage power station.

[0103] Please also refer to Figure 6 and Figure 7 When the energy storage device is a battery pack 1000 composed of multiple battery cells 100, the battery pack 1000 includes 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 achieve energy storage and release by connecting and controlling the battery cells 100. The multiple battery cells 100 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of the multiple battery cells 100 is accommodated in a carrier (such as a battery box 300). The battery pack 1000 may also include other structures. For example, the battery pack 1000 may also include a busbar component (not shown) for achieving electrical connection between the multiple battery cells 100. It is understandable that the number of battery cells 100 in the battery pack 1000 can be adaptively adjusted according to the application scenario and capacity.

[0104] The battery cell 100 includes a top cover assembly 10, a shell 30 and a battery cell (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 battery cell is housed in the shell 30. The shell 30 is a structure for loading battery cells. The cross-section of the shell 30 (a plane cut by a plane perpendicular to the thickness direction Z) may be, but is not limited to, circular, oval, square or other polygonal shapes. The material of the shell 30 includes, but is not limited to, metal or non-metal, wherein metal includes aluminum, iron, steel, aluminum alloy or iron alloy, etc., and non-metal includes, but is not limited to, plastic, etc. In the present application, the cross-section of the shell 30 is circular, so that it can be easily integrated into a cylindrical battery cell 100. The material of the shell 30 is aluminum alloy, so that while ensuring rigidity, the battery cell 100 can also be made lighter and easier to transport.

[0105] The battery cell is the core structure of the battery cell 100 that converts electrical energy into chemical energy through chemical reactions for charging and discharging. The battery cell is generally made by winding a pole piece assembly on a core rod. The pole piece assembly mainly includes a negative pole piece, a positive pole piece and a separator. In one possible design, the negative pole piece, the separator and the positive pole piece are stacked in sequence, adhered to the core rod by adhesive or hot melt, and then wound to form a battery cell. After the battery cell is formed, it has gaps through which the electrolyte can enter the battery cell. The electrolyte is used to soak the battery cell to ensure that ions can move freely during the charging and discharging process of the battery cell. The electrolyte includes but is not limited to electrolyte lithium salts, organic solvents and additives. The negative pole piece includes a negative electrode current collector (such as copper foil) and a negative electrode active material layer (such as carbon or silicon) coated on the surface of the negative electrode current collector. The positive pole piece includes a positive electrode current collector (such as aluminum foil) and a positive electrode active material layer (such as ternary material, lithium iron phosphate or lithium cobalt oxide) coated on the surface of the positive electrode current collector. The separator is located between adjacent negative and positive electrodes and is used to separate the negative and positive electrodes.

[0106] The battery box 300 is a structure for placing battery cells 100. The cross-section of the battery box 300 (the plane cut by a plane perpendicular to the thickness direction Z) can be, but is not limited to, circular, oval, square or other polygonal shapes. The material of the battery box 300 includes, but is not limited to, metal or non-metal, wherein metal includes aluminum, iron, steel, aluminum alloy or iron alloy, etc., and non-metal includes, but is not limited to plastic, etc. In the present application, the cross-section of the battery box 300 is rectangular. The material of the battery box 300 is aluminum alloy, so that while ensuring strength, the battery pack 1000 can be made lighter and easier to transport.

[0107] 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 to form a receiving cavity, and the battery cell 100 is received in the receiving cavity. The box body 310 is a component in the battery box 300 that loads and supports the battery cell 100. One end of the box body 310 is closed, and the other end is provided with an opening, and the opening is used for the battery cell 100 to be loaded into the receiving cavity. The cover body 330 is a component in the battery box 300 that covers the opening. The connection between the box body 310 and the cover body 330 can be detachably connected or non-detachably connected. The detachable connection includes but is not limited to screw connection, snap connection, or a combination of screw connection and snap connection. The non-detachable connection includes but is not limited to gluing connection, welding, or a combination of gluing connection and welding. In the present application, the box body 310 and the cover body 330 are detachably connected.

[0108] Furthermore, when the battery case 300 includes a body 310 and a cover 330, the battery case 300 may be made of more than one material. For example, the body 310 and the cover 330 may be made of the same aluminum alloy. Alternatively, different components of the battery case 300 may be made of different materials. For example, the body 310 may be made of metal, while the cover 330 may be made of plastic. Of course, the body 310 and the cover 330 may also be made of other different materials, which are not listed here.

[0109] Furthermore, this application also provides an electrical device 10000 that uses an energy storage device as a power source. Electrical device 10000 may include, but is not limited to, power tools, mobile phones, ships, spacecraft, or household energy storage systems. Spacecraft may include drones, rockets, and space shuttles. This application will only illustrate the example of electrical device 10000 being a household energy storage system.

[0110] The household energy storage system includes an energy storage device (taking the battery pack 1000 as an example), a conversion device 4000 (photovoltaic panel), a user load 2000 (street lamp), another user load 3000 (household appliances), etc. and a conversion device 4000. The energy storage device can be mounted on an outdoor wall in a wall-mounted manner. Specifically, the conversion device 4000 can be a photoelectric conversion device, which is installed on the roof and is used to convert light energy into electrical energy. The energy storage device is used to store the electrical energy and supply it to street lamps and household appliances when the electricity price is peak, or to supply power when the power grid is outage / power outage, or to supply power to the grid after being connected to the grid. It should be noted that the energy storage device of this application is not limited to household energy storage scenarios.

[0111] In the above technical solution, the pole 13 of the electrical equipment 10000 passes through the first through-hole 155 through the bending portion 135 and is connected to the second surface 152 of the current collecting plate 15, so that the current collecting plate 15 can be connected to the pole 13 without bending. On the one hand, the bending portion 135 can provide better support and fixation for the current collecting plate 15, making the structure of the top cover assembly 10 more stable and reducing the risk of deformation or damage during use; on the other hand, the reduction of the bending process of the current collecting plate 15 is conducive to the high-speed production of the top cover assembly 10 and improves the production efficiency of the top cover assembly 10. On the other hand, the current collecting plate 15 does not need to be bent, so compared with the current collecting plate 15 that needs to be bent, the current collecting plate 15 of the present application saves more material, thereby saving the production cost of the top cover assembly 10. On the other hand, the current collecting plate 15 does not need to be bent, which can reduce the risk of short circuit caused by accidental contact between the current collecting plate 15 and other components of the top cover assembly 10 (such as the top cover 11).

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A top cover assembly, characterized in that: include: a top cover including a first side and a second side opposite to each other in a thickness direction; a current collecting plate, the current collecting plate being disposed on the first side of the top cover, the current collecting plate comprising a first surface and a second surface opposite to each other in a thickness direction, the first surface being closer to the first side of the top cover than the second surface, the current collecting plate being provided with a first through hole penetrating the first surface and the second surface; and A pole is provided through the top cover and the first through hole, and protrudes relative to both the first side and the second side. A bent portion is provided at one end of the pole close to the second surface, and the bent portion passes through the first through hole and is connected to the second surface.

2. The top cover assembly according to claim 1, wherein: The thickness of the bent portion is greater than the thickness of the collecting plate.

3. The top cover assembly according to claim 1, wherein: The pole includes a pole body, a clamping portion, and the bent portion. The pole body passes through the top cover and protrudes relative to the first side and the second side. The opposite sides of the clamping portion are respectively connected to the pole body and the bent portion, and are located between the top cover and the first surface. A thinned area is provided at one end of the bent portion away from the clamping portion, and the thickness of the thinned area is less than the thickness of other areas on the bent portion.

4. The top cover assembly according to claim 3, wherein: The cross-sectional area of ​​the thinned region gradually decreases in a direction away from the central axis of the pole.

5. The top cover assembly according to claim 3, wherein: The second surface is recessed toward the first surface to form a protrusion on the side where the first surface is located, and a recess is formed on the side where the second surface is located, the first through hole is provided in the protrusion, and the top wall of the protrusion is connected to the bottom of the clamping portion.

6. The top cover assembly according to claim 5, characterized in that The bent portion is received in the recess and is spaced apart from an inner sidewall of the recess in a radial direction of the collecting plate.

7. The top cover assembly according to claim 5, wherein: A spacer is formed on the second surface protruding away from the first surface, and the spacer is higher than the protruding portion.

8. The top cover assembly according to claim 7, wherein: The spacers are evenly distributed around the center of the raised portion.

9. The top cover assembly according to claim 7, wherein: The collecting plate is further provided with a second through hole passing through the first surface and the second surface. The collecting plate includes a plurality of first areas and a plurality of second areas, which are alternately arranged in sequence around the center of the raised portion. The spacer and the second through hole are provided in the first area, and the first surface of the second area is recessed towards the second surface of the second area to form a receiving groove.

10. The top cover assembly according to claim 5, wherein: The cross section of the protrusion cut by a plane along the thickness direction of the top cover is a trapezoid that is smaller at the top and larger at the bottom.

11. The top cover assembly according to claim 1, wherein: The outer periphery of the collecting plate is provided with a positioning notch.

12. The top cover assembly according to any one of claims 1 to 11, characterized in that: The top cover assembly further comprises: an upper plastic, the upper plastic being mounted on a first side of the top cover and being sandwiched between the top cover and the pole; A lower plastic, the lower plastic being mounted on the second side of the top cover and being sandwiched between the top cover and the pole; a seal surrounding the column of the pole, wherein the seal is disposed between the top cover and the pole in the thickness direction of the top cover, and between the column and the lower plastic in the length / radial direction of the top cover; and A pressing block is installed on the first side of the top cover and is sandwiched between the pole and the upper plastic.

13. The top cover assembly according to claim 12, wherein: The collecting plate is riveted to the bent portion; and / or, The pressing block is riveted to the pole.

14. The top cover assembly according to claim 12, wherein: The top cover is provided with an explosion-proof hole, the lower plastic is provided with an explosion-proof through hole, the explosion-proof through hole is correspondingly connected to the explosion-proof hole, and in the thickness direction of the top cover, the explosion-proof through hole is staggered with the spacer on the collecting plate; The top cover assembly further includes an explosion-proof valve, which is installed on the top cover and covers the explosion-proof hole.

15. The top cover assembly according to claim 12, wherein: In the direction from the first side of the top cover to the second side of the top cover, the outer contour size of the lower plastic remains unchanged at first and then gradually decreases.

16. An energy storage device, characterized in that: The energy storage device comprises the top cover assembly according to any one of claims 1-15.

17. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to claim 16.

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