Top cover structure, battery cells, battery and electrical devices

Abstract

This application relates to a top cover structure, a battery cell, a battery, and an electrical device. The top cover structure includes: a top cover plate having a first side and a second side disposed opposite each other along its thickness direction, and the top cover plate including a first through hole penetrating the first side and the second side; and an electrode post, the electrode post including a column body and a first plate, the column body at least partially penetrating the first through hole, the first plate being located on the first side of the top cover plate, and the first plate including a first metal layer and a second metal layer, the first metal layer being recessed inward on the side facing the top cover plate to form a first groove, the second metal layer being located within the first groove, and the second metal layer being welded to the column body. The top cover structure, battery cell, battery, and electrical device provided by this application can reduce manufacturing costs and improve structural stability.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a top cover structure, a battery cell, a battery, and an electrical device. Background Technology

[0002] In recent years, the new energy industry has received increasing attention, and batteries, as an important component of this industry, occupy a large market share. Batteries are formed by connecting multiple individual cells in series, parallel, or a combination of both.

[0003] A battery cell includes a top cover structure, which contains terminals, the components used to output the electrical energy of the battery cell. Traditionally, the top plate in the terminals is a composite plate; to meet the requirements for weld penetration depth, the top plate has a large thickness, resulting in high manufacturing costs. Therefore, how to reduce the manufacturing cost of the top cover structure and improve its structural stability has become an urgent problem to be solved. Utility Model Content

[0004] Therefore, it is necessary to provide a top cover structure, battery cell, battery, and power supply device that can reduce manufacturing costs and improve structural stability in response to the above problems.

[0005] On one hand, this application provides a top cover structure, the top cover structure comprising:

[0006] A top cover plate has a first side and a second side disposed opposite each other along its thickness direction, and the top cover plate includes a first through hole penetrating the first side and the second side; and

[0007] The pole includes a column and a first plate. The column is at least partially inserted through the first through hole. The first plate is located on the first side of the top cover plate and includes a first metal layer and a second metal layer. The first metal layer is recessed inward on the side facing the top cover plate to form a first groove. The second metal layer is located in the first groove and is welded to the column.

[0008] In some embodiments, the first plate is recessed inward on the side facing the top cover to form a second groove, the second groove extending from the second metal layer to the first metal layer, and one end of the column is embedded in the second groove.

[0009] In some embodiments, the second metal layer is recessed inward on the side facing the top cover plate to form the second groove, and one end of the column is embedded in the second groove.

[0010] In some embodiments, the column includes a column body and a flange. The column body is at least partially inserted through the first through hole. The flange is located at one end of the column body, and the projection of the flange in the thickness direction of the top cover plate at least partially extends beyond the edge of the first through hole. The flange is embedded in the second groove and welded to the second metal layer.

[0011] In some embodiments, the first plate has a second through hole that penetrates the first metal layer and the second metal layer, and the column passes through the second through hole.

[0012] In some embodiments, the second via includes a first sub-via and a second sub-via located on the first metal layer and communicating with each other, wherein the cross-sectional area of ​​the first sub-via is larger than the cross-sectional area of ​​the second sub-via, and the first sub-via is farther away from the second metal layer relative to the second sub-via.

[0013] The column includes a first sub-part and a second sub-part connected together. The first sub-part passes through the first sub-hole, and the projection of the first sub-part in the thickness direction of the top cover plate at least partially extends beyond the edge of the second sub-hole. The second sub-part passes through the second sub-hole.

[0014] In some embodiments, the second through hole includes a third sub-hole and a fourth sub-hole located in the second metal layer, wherein the cross-sectional area of ​​the third sub-hole is smaller than the cross-sectional area of ​​the fourth sub-hole, and the fourth sub-hole is disposed away from the first metal layer relative to the third sub-hole;

[0015] The column includes a column body and a flange. The column body passes through the first through hole and the second through hole. The flange is arranged circumferentially around the column body and is located in the fourth sub-hole and welded to the second metal layer.

[0016] In some embodiments, the pole post further includes a second plate located on the second side of the top cover plate, and the projection of the second plate in the thickness direction of the top cover plate at least partially extends beyond the edge of the first through hole, and the second plate is fixedly connected to the pole body.

[0017] In some embodiments, the column includes a second sub-part and a third sub-part connected together. The second sub-part passes through the first through hole, and the third sub-part is fixedly connected to the second plate. The outer peripheral surface of the third sub-part is recessed relative to the outer peripheral surface of the second sub-part and defines an annular groove with the surface of the second sub-part facing the second plate.

[0018] The top cover structure also includes a sealing ring, which is at least partially disposed within the annular groove and located between the top cover plate and the second plate.

[0019] In some embodiments, the column includes a column body and a flange, the flange being disposed around the outer periphery of the column body, the projection of the flange in the thickness direction of the top cover plate at least partially extending beyond the edge of the first through hole, and the flange being located on the first side of the top cover plate and welded to the second metal layer;

[0020] The top cover structure also includes a sealing ring, which is at least partially located between the flange and the top cover plate.

[0021] In some embodiments, the outer peripheral surfaces of both the second metal layer and the sealing ring are arranged around the central axis of the second metal layer, and the outer peripheral surface of the second metal layer is farther away from the central axis of the second metal layer relative to the outer peripheral surface of the sealing ring.

[0022] In some embodiments, the first metal layer is an aluminum component, and the second metal layer and the column are copper components.

[0023] In some embodiments, the total thickness b of the first plate satisfies b≥2mm; the thickness d of the second metal layer satisfies d≥0.8mm; and the thickness n of the portion of the first metal layer that overlaps with the projection of the second metal layer in the thickness direction of the top cover plate satisfies n≤1.5mm.

[0024] On the other hand, this application provides a battery cell including a top cover structure as described in any of the above embodiments, wherein a welding area is provided on the surface of the first metal layer away from the top cover plate relative to the second metal layer, and the welding area is used for welding with an electrical connector.

[0025] In some embodiments, the welding area on the first metal layer does not coincide with the projection of the second metal layer in the thickness direction of the top cover plate.

[0026] In another aspect, this application provides a battery comprising a battery cell and an electrical connector as described in any of the above embodiments, wherein the electrical connector is welded to the welding area.

[0027] In another aspect, this application provides an electrical device that includes a battery as described in the above embodiments.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] In the aforementioned top cover structure, battery cell, battery, and electrical device, the first groove on the first metal layer of the first plate can accommodate the second metal layer, making the total thickness of the first plate the same as the total thickness of the first metal layer. This design reduces the total thickness of the first plate, thereby reducing its manufacturing cost. Furthermore, when the second metal layer is disposed within the first groove, its length and width are both less than those of the first metal layer. This design reduces the length and width of the second metal layer, further reducing the manufacturing cost of the first plate. In summary, the manufacturing costs of the top cover structure, battery cell, battery, and electrical device are also reduced. Moreover, welding the second metal layer to the column provides a more stable and reliable connection between the column and the first plate compared to traditional riveting methods, thus improving the structural stability of the top cover structure, battery cell, battery, and electrical device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a battery in an embodiment of this application, showing the cooperation between multiple battery cells and multiple electrical connectors.

[0031] Figure 2 for Figure 1 A top view of the battery shown;

[0032] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the battery taken along the AA direction.

[0033] Figure 4 for Figure 3 An enlarged schematic diagram of a local structure B in the battery shown;

[0034] Figure 5 for Figure 1 A schematic diagram of the column structure in a single battery cell is shown.

[0035] Figure 6 This is a schematic diagram of the top cover structure in a battery cell according to another embodiment of this application;

[0036] Figure 7 for Figure 6 The diagram shown is a schematic of the top cover structure without the first insulating component.

[0037] Figure 8 for Figure 6 The top view of the roof structure shown;

[0038] Figure 9 for Figure 6 The diagram shows the top cover structure without the first metal layer.

[0039] Figure 10 for Figure 6 The top view of the roof structure shown;

[0040] Figure 11 for Figure 10 The diagram shows a cross-sectional view of the top cover structure taken along the CC direction.

[0041] Figure 12 for Figure 11 An enlarged schematic diagram of a portion of structure M in the top cover structure shown;

[0042] Figure 13 for Figure 6 A schematic diagram of the column structure in the top cover structure shown;

[0043] Figure 14 for Figure 6 The diagram shows the structural arrangement of the column and the sealing ring in a single battery cell.

[0044] Figure 15 This is a top view of the top cover structure in a battery cell according to another embodiment of this application;

[0045] Figure 16 for Figure 15 The diagram shows a cross-sectional view of the top cover structure taken along the EE direction.

[0046] Figure 17 for Figure 16 An enlarged schematic diagram of a portion of structure F in the top cover structure shown;

[0047] Figure 18 for Figure 15 A schematic diagram of the column structure in the top cover structure shown;

[0048] Figure 19 for Figure 15 A schematic diagram of the structure in which the column and the sealing ring mate in the top cover structure shown;

[0049] Figure 20 This is a top view of the top cover structure in a battery cell according to another embodiment of this application;

[0050] Figure 21 for Figure 20 The diagram shows a cross-sectional view of the top cover structure taken along the GG direction.

[0051] Figure 22 for Figure 21 An enlarged schematic diagram of a local structure H in the top cover structure shown;

[0052] Figure 23 for Figure 20 A schematic diagram of the column structure in the top cover structure shown;

[0053] Figure 24 for Figure 20 A schematic diagram of the structure in which the column and the sealing ring mate in the top cover structure shown;

[0054] Figure 25 This is an exploded view of a battery in one embodiment of this application;

[0055] Figure 26 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0056] Icon labels:

[0057] 10000, Electrical appliances;

[0058] 1000, battery;

[0059] 100. Battery cell; 200. Electrical connector; 300. First part; 400. Second part;

[0060] 10. Housing; 20. Electrode assembly; 30. Top cover plate; 31. First side; 32. Second side; 33. First through hole; 40. Electrode post; 41. Post body; 411. Post body; 4111. First sub-part; 4112. Second sub-part; 4113. Third sub-part; 4114. Annular groove; 412. Flange; 42. First plate; 421. First metal layer; 4211. First groove; 4212. Welding area; 422. Second metal layer; 4221. Second groove; 4222. Second through hole; 42221. First sub-hole; 42222. Second sub-hole; 42223. Third sub-hole; 42224. Fourth sub-hole; 43. Second plate; 431. Third through hole; 50. First insulating component; 60. Second insulating component; 70. Sealing ring; 71. First ring; 72. Second ring. Detailed Implementation

[0061] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0062] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the liquid level of the first feature is higher than that of the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the liquid level of the first feature is lower than that of the second feature.

[0066] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0067] Please see Figures 1 to 4 This application provides a top cover structure and a battery cell 100. The battery cell 100 includes a housing 10, a top cover structure, and an electrode assembly 20. The top cover structure includes a top cover plate 30 and electrode posts 40. The top cover plate 30 covers the opening of the housing 10 and forms a receiving cavity with the housing 10, and the electrode assembly 20 is enclosed in the receiving cavity. The top cover plate 30 has a first side 31 and a second side 32 disposed opposite to each other along its thickness direction. The first side 31 is located on the side away from the receiving cavity, and the second side 32 is located on the side facing the receiving cavity. The top cover plate 30 includes a first through hole 33 penetrating the first side 31 and the second side 32. The electrode post 40 includes a post 41 and a first plate 42. The post 41 is at least partially inserted through the first through hole 33. The first plate 42 is located on the first side 31 of the top cover plate 30 and includes a first metal layer 421 and a second metal layer 422. The first metal layer 421 is recessed inward on the side facing the top cover plate 30 to form a first groove 4211. The second metal layer 422 is located in the first groove 4211 and is welded to the post 41. The post 41 is electrically connected to the electrode assembly 20.

[0068] As an example, the housing 10 can be a hollow structure with one end open and the other closed, or with both ends open. The top cover 30 closes to the opening of the housing 10 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the top cover 30 is adapted to the shape of the housing 10. For example, if the housing 10 is a cuboid structure, the top cover 30 is a rectangular plate structure adapted to the housing 10. Or, if the housing 10 is a cylindrical structure, the top cover 30 is a circular plate structure adapted to the housing 10.

[0069] Electrode assembly 20 is the smallest unit in the battery 1000 where electrochemical reactions take place. Typically, electrode assembly 20 includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the positive and negative electrode, insulating them while allowing ions to pass through. Currently, common types of electrode assemblies 20 are wound and stacked. The positive electrode includes a positive tab, and the negative electrode includes a negative tab.

[0070] The terminal 40 is a component used to output electrical energy from the battery cell 100. The terminal 40 may include a positive terminal and a negative terminal. The positive terminal is used to electrically connect to the positive tab of the electrode assembly 20, and the negative terminal is used to electrically connect to the negative tab of the electrode assembly 20. The positive terminal and the positive tab can be directly connected or indirectly connected through an adapter, and the negative terminal and the negative tab can be directly connected or indirectly connected through an adapter.

[0071] The pole post 40 includes a post 41, which can be completely located within the first through hole 33, or the post 41 can be partially located within the first through hole 33, with the remaining part of the post 41 protruding from the first side 31 and / or the second side 32, which can be set according to requirements.

[0072] The pole post 40 also includes a first plate 42, which is located on the first side 31 of the top cover plate 30, that is, on the outer side of the top cover plate 30. The first plate 42 includes a first metal layer 421 and a second metal layer 422, which are made of different materials. The side of the first metal layer 421 facing the top cover plate 30 is recessed inward to form a first groove 4211. The second metal layer 422 is located in the first groove 4211 and is welded to the pole post 41.

[0073] In this application, the first plate 42 is the aforementioned top plate. A first groove 4211 formed on the first metal layer 421 of the first plate 42 can accommodate the second metal layer 422, such that the total thickness of the first plate 42 is the same as the total thickness of the first metal layer 421. This design reduces the total thickness of the first plate 42, thereby reducing its manufacturing cost. Furthermore, when the second metal layer 422 is disposed within the first groove 4211, the length of the second metal layer 422 is less than the length of the first metal layer 421, and the width of the second metal layer 422 is also less than the width of the first metal layer 421. This design reduces the length and width of the second metal layer 422, thereby further reducing the manufacturing cost of the first plate 42. In summary, the manufacturing costs of the top cover structure and the battery cell 100 are also reduced. In addition, the second metal layer 422 is welded to the column 41. Compared with the traditional riveting method, the connection between the column 41 and the first plate 42 is more stable and reliable, thereby improving the structural stability of the top cover structure and the battery cell 100.

[0074] Specifically, the second metal layer 422 is made of the same material as the pillar 41 and its corresponding tab. When components made of the same material are welded, the physical properties are the same, such as thermal conductivity and coefficient of linear expansion, which can complement each other. Therefore, the welding is less difficult and less prone to cracking, resulting in a good welding effect.

[0075] As an example, taking the negative electrode post 40 as an example, the second metal layer 422, the post 41, and the negative electrode tab are all copper components. Copper has good conductivity and can efficiently conduct current, ensuring the battery's 1000 performance. In this embodiment, the first metal layer 421 is an aluminum component. Aluminum has a low melting point and is easy to weld, making it suitable as a structural support for the first plate 42. The aluminum-copper composite structure can balance processing and conductivity, resulting in a top cover structure with better structural stability and conductivity. Furthermore, since copper is more expensive, using a copper-aluminum composite structure as the negative electrode post can also reduce costs.

[0076] Typically, multiple battery cells 100 are connected in series or in parallel by the first plate 42 through electrical connectors 200. Generally, the electrical connectors 200 are made of aluminum, and the first metal layer 421 is also made of aluminum. This ensures that the electrical connectors 200 and the first metal layer 421 are welded to the same metal. Welding to the same metal is less difficult and less prone to cracking. This ensures the welding effect while also improving the current carrying capacity.

[0077] In some embodiments, the central axes of the first metal layer 421 and the second metal layer 422 coincide, that is, the second metal layer 422 is located in the central region of the first metal layer 421. Alternatively, the central axes of the first metal layer 421 and the second metal layer 422 may be parallel and spaced apart, that is, the second metal layer 422 may be eccentrically positioned relative to the first metal layer 421. The specific configuration can be determined according to requirements and is not limited here.

[0078] Please see Figures 6 to 12 In some embodiments, the total thickness b of the first plate 42 satisfies b≥2mm, preferably 2mm≤b≤3mm. If the thickness is less than 2mm, it is difficult to meet the welding penetration requirements when 1000 batteries are connected in series and parallel. If the thickness is greater than 3mm, it will result in a large thickness of the first plate 42, increasing unnecessary costs. The thickness d of the second metal layer 422 satisfies d≥0.8mm. The second metal layer 422 needs a certain thickness to connect with the column 41. If the thickness d of the second metal layer 422 is less than 0.8mm, it is difficult to meet the connection requirements with the column 41. The thickness n of the portion of the first metal layer 421 that overlaps with the projection of the second metal layer 422 in the thickness direction of the top cover plate 30 satisfies n≤1.5mm.

[0079] As an example, b can be, but is not limited to, 2mm, 2.5mm, and 3mm, etc.; d can be, but is not limited to, 0.8mm, 1mm, and 1.2mm, etc.; and n can be, but is not limited to, 1mm, 1.2mm, and 1.5mm, etc.

[0080] Specifically, the total thickness of the first plate 42 is the same as the total thickness of the first metal layer 421, and specifically the thickness of the portion of the first metal layer 421 projected onto the top cover plate 30 outside the second metal layer 422. This portion is typically used for welding with the electrical connector 200 to output the electrical energy of the battery cell 100. Generally, when this portion is welded to the electrical connector 200, the thickness 'a' of the solder mark formed on the first metal layer 421 is typically in the range of 0.8 mm to 1.5 mm. Therefore, to prevent the first plate 42 from being melted through during welding, the total thickness 'b' of the first plate 42 needs to be designed to satisfy 'b≥2mm'. Simultaneously, a first insulating member 50 is provided between the first plate 42 and the top cover plate 30. The first insulating member 50 belongs to the top cover structure and is used to achieve an insulating connection between the first plate 42 and the top cover plate 30. If the first plate 42 is melted through, the first insulating component 50 will melt due to heat, and the insulation effect of the first insulating component 50 will fail, making it easy for the first plate 42 to conduct electricity with the top cover plate 30, thus causing a serious safety hazard.

[0081] As an example, 25% ≤ a / b ≤ 75%, preferably 35% ≤ a / b ≤ 65%, wherein a / b can be, but is not limited to, 25%, 35%, 45%, 65%, and 75%, etc.

[0082] When the second metal layer 422 is welded to the column 41, the thickness of the weld mark formed by the second metal layer 422 and the column 41 is generally in the range of 0.3mm to 0.8mm. In order to avoid the second metal layer 422 being melted through during welding, which would cause the welding laser, electric arc, electron beam, etc. to come into contact with the contact surface of the first metal layer 421 and the second metal layer 422 and cause a blowout, the thickness d of the second metal layer 422 needs to be designed to satisfy d≥0.8mm.

[0083] The thickness n of the portion of the first metal layer 421 that overlaps with the second metal layer 422 in the thickness direction of the top cover plate 30 is the difference between the total thickness b of the first plate 42 and the thickness d of the second metal layer 422, i.e., bd = n. If n ≤ 1.5 mm, the total thickness of the first plate 42 can be further reduced, thereby further reducing the manufacturing cost of the top cover structure and the battery cell 100.

[0084] Please refer to it again. Figure 12 In some embodiments, a welding area 4212 is provided on the surface of the first metal layer 421 that is away from the top cover plate 30 relative to the second metal layer 422. The welding area 4212 is used to weld with the electrical connector 200 to achieve the purpose of connecting the battery cell 100 and the electrical connector 200.

[0085] Furthermore, the welding area 4212 on the first metal layer 421 and the projection of the second metal layer 422 in the thickness direction of the top cover plate 30 do not coincide. That is, the welding area 4212 on the first metal layer 421 and the second metal layer 422 are staggered, for example, the second metal layer 422 is located in the central region of the first metal layer 421, and the welding area 4212 is eccentrically positioned relative to the first metal layer 421.

[0086] The welding area 4212 on the first metal layer 421 and the projection of the second metal layer 422 in the thickness direction of the first wall 30 do not coincide, so that the weld marks formed when the first metal layer 421 is welded to the electrical connector 200 and the weld marks formed when the second metal layer 422 is welded to the column 41 are misaligned. In this way, the thickness of the first plate 42 can be reduced, the manufacturing cost of the battery cell 100 can be reduced, and the space utilization rate can be improved.

[0087] In some embodiments, the welding area 4212 is disposed around the outer periphery of the second metal layer 422, thereby enabling the formation of a solder mark surrounding the second metal layer 422. This solder mark has a large welding area, which is beneficial to improving the reliability and stability of the welding between the battery cell 100 and the electrical connector 200.

[0088] In some embodiments, there are two welding areas 4212, which are arranged along the length of the top cover plate 30 on opposite sides of the second metal layer 422. In this case, both opposite ends of the first plate 42 can be welded and fixed to the electrical connector 200, and the welding is reliable and stable.

[0089] As an example, the distance D between the welding area 4212 and the second metal layer 422 in the length direction of the top cover plate 30 satisfies 1mm≤D≤10mm, preferably 2mm≤D≤6mm.

[0090] As an example, D can be, but is not limited to, 1mm, 2mm, 5mm, 6mm, 7mm, and 10mm, etc.

[0091] When D is too small, during welding of the welding area 4212 of the first metal layer 421 to the electrical connector 200, or during welding of the second metal layer 422 to the column 41, the welding laser, electric arc, electron beam, etc., are prone to contact with the first metal layer 421 and the second metal layer 422, causing welding defects such as craters and incomplete welds. When D is too large, the first metal layer 421 will have a large dimension in the length direction of the top cover plate 30, resulting in increased manufacturing costs.

[0092] By designing D to satisfy 1mm≤D≤10mm, preferably 2mm≤D≤6mm, the spacing between the welding area 4212 and the second metal layer 422 in the length direction of the top cover plate 30 is appropriate, which can reduce welding defects and reduce the size of the first metal layer 421, thereby achieving the purpose of improving safety and reducing costs.

[0093] In some embodiments, the first plate 42 is recessed inward on the side facing the top cover plate 30 to form a second groove 4221. The second groove 4221 extends from the second metal layer 422 to the first metal layer 421. One end of the column 41 is embedded in the second groove 4221 and welded to the second metal layer 422. That is, the second groove 4221 is located in both the first metal layer 421 and the second metal layer 422. This design can increase the depth of the second groove 4221, thereby increasing the length of the column 41 extending into the second groove 4221, which facilitates the positioning of the column 41.

[0094] Please see Figure 4 In some embodiments, the second metal layer 422 is recessed inward on the side facing the top cover plate 30 to form a second groove 4221, and one end of the column 41 is embedded in the second groove 4221. That is, the second groove 4221 is located only on the second metal layer 422. In this design, the second groove 4221 is relatively shallow, which facilitates molding and can position the column 41.

[0095] Please continue reading. Figure 4 In some embodiments, the column 41 includes a column body 411 and a flange 412. The column body 411 is at least partially inserted through the first through hole 33. The flange 412 is located at one end of the column body 411, and the projection of the flange 412 in the thickness direction of the top cover plate 30 at least partially extends beyond the edge of the first through hole 33. The flange 412 is embedded in the second groove 4221 and welded to the second metal layer 422.

[0096] Specifically, the cross-sectional area of ​​the flange 412 is larger than that of the first through hole 33. When the flange 412 is disposed on the first side 31 of the top cover plate 30, the flange 412 can prevent the column 41 from moving toward the second side 32 of the top cover plate 30, thereby positioning and limiting the installation of the column 41. In addition, the flange 412 extends circumferentially along the column body 411, thereby enabling more stable positioning.

[0097] It is worth mentioning that the cross-sectional area of ​​the flange 412 mentioned in this application refers to the area of ​​the region enclosed by the outer peripheral surface of the flange 412.

[0098] The flange 412 is embedded in the second groove 4221 and welded to the second metal layer 422, thereby achieving the connection between the column 41 and the first plate 42. In this embodiment, the flange 412 and the second groove 4221 can be configured to have an interference fit, and the first metal layer 421 and the second metal layer 422 can be bonded more tightly through expansion, so as to reduce the installation gap between the first metal layer 421 and the second metal layer 422, thereby reducing the contact resistance between the first metal layer 421 and the second metal layer 422.

[0099] Please see Figure 4 and Figure 5 This saves material usage for flange 412 and allows flange 412 to have a suitable width for easy welding with the second metal layer 422. The width of the flange 412 protrusion is set to C, where C satisfies 1mm≤C≤7mm, preferably 2mm≤C≤5mm.

[0100] Where C can be, but is not limited to, 1mm, 2mm, 3mm, 5mm, and 7mm, etc.

[0101] Please see Figures 10 to 13 In some embodiments, the first plate 42 has a second through hole 4222 penetrating the first metal layer 421 and the second metal layer 422, and the column 41 passes through the second through hole 4222. In this embodiment, the length of the column 41 inserted into the first plate 42 is relatively long, which is beneficial for positioning and installing the column 41.

[0102] Please see Figures 15 to 18 Furthermore, in some embodiments, the second through hole 4222 includes a first sub-hole 42221 and a second sub-hole 42222 located on the first metal layer 421 and communicating with each other. The cross-sectional area of ​​the first sub-hole 42221 is larger than the cross-sectional area of ​​the second sub-hole 42222, and the first sub-hole 42221 is farther away from the second metal layer 422 relative to the second sub-hole 42222. The column 41 includes a first sub-part 4111 and a second sub-part 4112 connected together. The first sub-part 4111 passes through the first sub-hole 42221, and the projection of the first sub-part 4111 in the thickness direction of the top cover plate 30 at least partially extends beyond the edge of the second sub-hole 42222. The second sub-part 4112 passes through the second sub-hole 42222.

[0103] The first sub-part 4111 passes through the first sub-hole 42221 and is riveted to and fixed to the first sub-hole 42221. Combined with the second metal layer 422 and welded to the column 41, this improves the connection strength between the column 41 and the first plate 42. Furthermore, under the riveting force between the first sub-part 4111 and the first sub-hole 42221, the first metal layer 421 and the second metal layer 422 are more tightly bonded, reducing the contact resistance between them.

[0104] It is worth mentioning that the cross-sectional area of ​​the hole mentioned in this application refers to the area of ​​the region enclosed by the edge of the hole.

[0105] In some embodiments, the second through hole 4222 includes a third sub-hole 42223 and a fourth sub-hole 42224 located in the second metal layer 422. The cross-sectional area of ​​the third sub-hole 42223 is smaller than that of the fourth sub-hole 42224, and the fourth sub-hole 42224 is disposed away from the first metal layer 421 relative to the third sub-hole 42223. The column 41 includes a column body 411 and a flange 412. The column body 411 passes through the first through hole 33 and the second through hole 4222. The flange 412 is disposed circumferentially around the column body 411 and is located in the fourth sub-hole 42224 and welded to the second metal layer 422.

[0106] Specifically, the column body 411 includes a first sub-part 4111 and a second sub-part 4112, with a flange 412 disposed on the second sub-part 4112.

[0107] In this embodiment, the flange 412 cooperates with the first sub-part 4111 to limit the column 41 along the thickness direction of the top cover plate 30, so as to prevent the column 41 from moving in the thickness direction, making the installation of the column 41 and the first plate 42 more secure and stable.

[0108] Please see Figure 17 In some embodiments, the pole post 40 further includes a second plate 43 located on the second side 32 of the top cover plate 30, and the projection of the second plate 43 in the thickness direction of the top cover plate 30 extends at least partially beyond the edge of the first through hole 33, and the second plate 43 is fixedly connected to the post 41.

[0109] As an example, the second plate 43 and the column 41 can be fixedly connected by welding, bonding or other means, which can be set according to the requirements.

[0110] Preferably, the second plate 43 is disposed at the end of the column 41 away from the first plate 42 and is welded to the column 41 through the weld. Alternatively, the second plate 43 is provided with a third through hole 431, the column 41 is disposed in the third through hole 431 and is laser welded to the second plate 43.

[0111] As an example, the second plate 43 is made of the same material as the column 41, which facilitates welding of the second plate 43 to the column 41.

[0112] The projection of the second plate 43 in the thickness direction of the top cover plate 30 at least partially extends beyond the edge of the first through hole 33. Therefore, the second plate 43 can prevent the post 41 from exiting the first through hole 33. The first plate 42 and the second plate 43 cooperate to further prevent the post 41 from moving in the thickness direction of the top cover plate 30, thereby improving the stability and reliability of the installation of the top cover plate 30 and the pole post 40.

[0113] In some embodiments, the top cover structure further includes a second insulating member 60 (commonly known as the lower plastic), which is located between the second plate 43 and the top cover plate 30 and is used to achieve an insulating connection between the second plate 43 and the top cover plate 30.

[0114] Please see Figures 11 to 14 , Figures 17 to 19 In some embodiments, the column 41 includes a second sub-part 4112 and a third sub-part 4113 connected together. The second sub-part 4112 passes through the first through hole 33, and the third sub-part 4113 is fixedly connected to the second plate 43. The outer peripheral surface of the third sub-part 4113 is recessed relative to the outer peripheral surface of the second sub-part 4112, and defines an annular groove 4114 with the surface of the second sub-part 4112 facing the second plate 43. The top cover structure also includes a sealing ring 70, which is at least partially disposed in the annular groove 4114 and located between the top cover plate 30 and the second plate 43.

[0115] Specifically, the third sub-part 4113 is located on the main body 411 of the column.

[0116] As an example, the sealing ring 70 can be a rubber ring, a silicone ring, or other elastic ring, which can be set according to the requirements.

[0117] When there is a gap at the weld mark formed by the welding of the second plate 43 and the column 41, the electrolyte may flow outward along the gap, causing leakage of the battery cell 100. In this application, by providing the annular groove 4114, the top cover plate 30 and the second plate 43 in cooperation, the sealing ring 70 can be at least partially pressed between the top cover plate 30 and the second plate 43, thereby reducing the risk of leakage due to incomplete sealing caused by gaps when the second plate 43 is welded to the column 41.

[0118] Furthermore, in this embodiment, since the sealing ring 70 is located between the top cover plate 30 and the second plate 43, there is a certain distance between the sealing ring 70 and the first plate 42, so that the composite interface formed by the first metal layer 421 and the second metal layer 422 facing the top cover plate 30 will not be affected by the reaction force of the sealing ring 70, thus reducing the risk of the composite interface detaching.

[0119] It is understood that the composite interface is formed by the surface of the first metal layer 421 facing the top cover plate 30 in the part where the first groove 4211 is not formed, and the surface of the second metal layer 422 facing the top cover plate 30.

[0120] Please see Figures 20 to 24 In some embodiments, the column 41 includes a column body 411 and a flange 412. The flange 412 is disposed around the outer periphery of the column body 411. The projection of the flange 412 in the thickness direction of the top cover plate 30 extends at least partially beyond the edge of the first through hole 33. The flange 412 is located on the first side 31 of the top cover plate 30 and is welded to the second metal layer 422. The top cover structure also includes a sealing ring 70, which is at least partially located between the flange 412 and the top cover plate 30 and is in close contact with the flange 412 and the top cover plate 30.

[0121] By engaging the flange 412 with the top cover plate 30 and pressing the sealing ring 70, the electrolyte can be prevented from flowing outward, thus avoiding leakage.

[0122] Please see Figure 4 , Figure 12 , Figure 17 and Figure 22 In some embodiments, the outer peripheral surfaces of both the second metal layer 422 and the sealing ring 70 are arranged around the central axis of the second metal layer 422, and the outer peripheral surface of the second metal layer 422 is farther away from the central axis of the second metal layer 422 relative to the outer peripheral surface of the sealing ring 70.

[0123] In this way, the electrolyte can be sealed within the area defined by the outer peripheral surface of the sealing ring 70, so as to ensure that the electrolyte will not flow outside the area defined by the outer peripheral surface of the sealing ring 70, thereby reducing the risk of corrosion of the first metal layer 421 and the second metal layer 422 due to contact between the electrolyte and the first metal layer 421 and the second metal layer 422.

[0124] like Figure 22 As shown, in some embodiments, the minimum distance A between the outer peripheral surface of the second metal layer 422 and the outer peripheral surface of the sealing ring 70 satisfies 0 < A ≤ 6 mm, preferably 0.5 mm ≤ A ≤ 3 mm.

[0125] As an example, A can be, but is not limited to, 0.5mm, 1mm, 3mm, 4mm, and 6mm, etc.

[0126] In this embodiment, by limiting the value range of A to the above range, the size of A is set more appropriately, which can save the amount of the second metal layer 422 and reserve sufficient space on the first metal layer 421 to set the welding area 4212, so as to facilitate the welding of the first metal layer 421 and the electrical connector 200.

[0127] In some embodiments, the maximum distance B between the inner circumferential surface of the sealing ring 70 and the outer circumferential surface of the sealing ring 70 satisfies 1.8mm≤B≤3mm.

[0128] Specifically, the maximum distance B between the inner circumferential surface of the sealing ring 70 and the outer circumferential surface of the sealing ring 70 can be, but is not limited to, 1.8 mm, 2 mm, and 3 mm, etc.

[0129] Taking a sealing ring 70 as an annular structure, with the entire sealing ring 70 located between the top cover plate 30 and the second plate 43, or entirely between the flange 412 and the top cover plate 30, as an example, the distance between the inner circumferential surface and the outer circumferential surface of the sealing ring 70 is B. Taking a sealing ring 70 including a connected first ring portion 71 and a second ring portion 72 (e.g.) Figure 4 and Figure 22 Taking the example shown, the first ring portion 71 is located inside the first through hole 33, and the second ring portion 72 is located between the top cover plate 30 and the second plate 43, or between the flange 412 and the top cover plate 30 (i.e., the sealing ring portion is located between the top cover plate 30 and the second plate 43, or between the flange 412 and the top cover plate 30). The inner circumferential surfaces of the first ring portion 71 and the second ring portion 72 are flush, and the outer circumferential surface of the second ring portion 72 is far away from the central axis of the sealing ring 70 relative to the outer circumferential surface of the first ring portion 71. The maximum distance B between the inner circumferential surface of the sealing ring 70 and the outer circumferential surface of the sealing ring 70 is the distance between the inner circumferential surface of the second ring portion 72 and the outer circumferential surface of the second ring portion 72.

[0130] The maximum distance B between the inner circumferential surface and the outer circumferential surface of the sealing ring 70 is designed to satisfy 1.8mm≤B≤3mm. This ensures that the sealing ring 70 has sufficient compression width (i.e., the radial dimension of the sealing ring 70) while also saving material usage in manufacturing the sealing ring 70 and reducing the manufacturing cost of the battery cell 100.

[0131] like Figure 12 and Figure 22 In some embodiments, the projections of the welding area 4212 and the sealing ring 70 in the thickness direction of the top cover plate 30 do not overlap. This is to avoid leakage caused by the sealing ring 70 melting through during the welding process of the electrical connector 200 in the welding area 4212.

[0132] It is understandable that the distance between the welding area 4212 and the sealing ring 70 is D+A.

[0133] Please refer to 2. This application also provides a battery 1000, which includes a battery cell 100 as described in any of the above and an electrical connector 200, wherein the electrical connector 200 is welded to the welding area 4212.

[0134] The battery 1000 in this application has the effects of any of the above embodiments, so it will not be described again here.

[0135] Please see Figure 25 In some embodiments, the battery 1000 further includes a housing, which includes a first portion 300 and a second portion 400. The first portion 300 and the second portion 400 enclose a space for placing the battery cell 100 and the electrical connector 200, so as to reduce external interference to the battery cell 100 and the electrical connector 200.

[0136] Please see Figure 26 This application also provides an electrical device 10000, which includes a battery 1000 as described in any of the above embodiments, the battery 1000 being used to provide electrical energy to the electrical device 10000.

[0137] The electrical device 10000 can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0138] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical device 10000 described above.

[0139] Please see Figures 1 to 5 In the aforementioned top cover structure, battery cell 100, battery 1000, and power device 10000, the first groove 4211 on the first metal layer 421 of the first plate 42 can accommodate the second metal layer 422, so that the total thickness of the first plate 42 is the same as the total thickness of the first metal layer 421. This design can reduce the total thickness of the first plate 42, thereby reducing the manufacturing cost of the first plate 42. Furthermore, when the second metal layer 422 is disposed in the first groove 4211, the length of the second metal layer 422 will be less than the length of the first metal layer 421, and the width of the second metal layer 422 will also be less than the width of the first metal layer 421. This design reduces the length and width of the second metal layer 422, thereby further reducing the manufacturing cost of the first plate 42. In summary, the manufacturing costs of the top cover structure, battery cell 100, battery 1000, and power device 10000 are also reduced accordingly. In addition, the second metal layer 422 is welded to the column 41. Compared with the traditional riveting method, the connection between the column 41 and the first plate 42 is more stable and reliable, thereby improving the structural stability of the top cover structure, the battery cell 100, the battery 1000 and the power device 10000.

[0140] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A top cover structure, characterized in that, The top cover structure includes: A top cover plate (30) has a first side (31) and a second side (32) disposed opposite to each other along its thickness direction, and the top cover plate (30) includes a first through hole (33) penetrating the first side (31) and the second side (32); and The pole (40) includes a column (41) and a first plate (42). The column (41) is at least partially inserted through the first through hole (33). The first plate (42) is located on the first side (31) of the top cover plate (30). The first plate (42) includes a first metal layer (421) and a second metal layer (422). The first metal layer (421) is recessed inward on the side facing the top cover plate (30) to form a first groove (4211). The second metal layer (422) is located in the first groove (4211) and is welded to the column (41).

2. The top cover structure according to claim 1, characterized in that, The first plate (42) is recessed inward on the side facing the top cover plate (30) to form a second groove (4221). The second groove (4221) extends from the second metal layer (422) to the first metal layer (421). One end of the column (41) is embedded in the second groove (4221).

3. The top cover structure according to claim 1, characterized in that, The second metal layer (422) is recessed inward on the side facing the top cover plate (30) to form a second groove (4221), and one end of the column (41) is embedded in the second groove (4221).

4. The top cover structure according to claim 2 or 3, characterized in that, The column (41) includes a column body (411) and a flange (412). The column body (411) is at least partially inserted through the first through hole (33). The flange (412) is located at one end of the column body (411), and the projection of the flange (412) in the thickness direction of the top cover plate (30) at least partially extends beyond the edge of the first through hole (33). The flange (412) is embedded in the second groove (4221) and welded to the second metal layer (422).

5. The top cover structure according to claim 1, characterized in that, The first plate (42) has a second through hole (4222) that penetrates the first metal layer (421) and the second metal layer (422), and the column (41) is inserted into the second through hole (4222).

6. The top cover structure according to claim 5, characterized in that, The second through hole (4222) includes a first sub-hole (42221) and a second sub-hole (42222) located on the first metal layer (421) and communicating with each other. The cross-sectional area of ​​the first sub-hole (42221) is larger than the cross-sectional area of ​​the second sub-hole (42222), and the first sub-hole (42221) is farther away from the second metal layer (422) relative to the second sub-hole (42222). The column (41) includes a first sub-part (4111) and a second sub-part (4112) connected together. The first sub-part (4111) passes through the first sub-hole (42221), and the projection of the first sub-part (4111) in the thickness direction of the top cover plate (30) extends at least partially beyond the edge of the second sub-hole (42222). The second sub-part (4112) passes through the second sub-hole (42222).

7. The top cover structure according to claim 5, characterized in that, The second through hole (4222) includes a third sub-hole (42223) and a fourth sub-hole (42224) located in the second metal layer (422). The cross-sectional area of ​​the third sub-hole (42223) is smaller than the cross-sectional area of ​​the fourth sub-hole (42224), and the fourth sub-hole (42224) is disposed away from the first metal layer (421) relative to the third sub-hole (42223). The column (41) includes a column body (411) and a flange (412). The column body (411) passes through the first through hole (33) and the second through hole (4222). The flange (412) is arranged around the column body (411) in the circumferential direction and is located in the fourth sub-hole (42224) and welded to the second metal layer (422).

8. The top cover structure according to claim 1, characterized in that, The pole post (40) further includes a second plate (43), which is located on the second side (32) of the top cover plate (30), and the projection of the second plate (43) in the thickness direction of the top cover plate (30) extends at least partially beyond the edge of the first through hole (33), and the second plate (43) is fixedly connected to the post (41).

9. The top cover structure according to claim 8, characterized in that, The column (41) includes a second sub-part (4112) and a third sub-part (4113) connected together. The second sub-part (4112) passes through the first through hole (33). The third sub-part (4113) is fixedly connected to the second plate (43). The outer peripheral surface of the third sub-part (4113) is recessed relative to the outer peripheral surface of the second sub-part (4112), and defines an annular groove (4114) with the surface of the second sub-part (4112) facing the second plate (43). The top cover structure also includes a sealing ring (70), which is at least partially disposed in the annular groove (4114) and located between the top cover plate (30) and the second plate (43).

10. The top cover structure according to claim 1, characterized in that, The column (41) includes a column body (411) and a flange (412). The flange (412) is disposed around the outer periphery of the column body (411). The projection of the flange (412) in the thickness direction of the top cover plate (30) extends at least partially beyond the edge of the first through hole (33). The flange (412) is located on the first side (31) of the top cover plate (30) and is welded to the second metal layer (422). The top cover structure also includes a sealing ring (70), which is at least partially located between the flange (412) and the top cover plate (30).

11. The top cover structure according to claim 9 or 10, characterized in that, The outer peripheral surfaces of both the second metal layer (422) and the sealing ring (70) are arranged around the central axis of the second metal layer (422), and the outer peripheral surface of the second metal layer (422) is far away from the central axis of the second metal layer (422) relative to the outer peripheral surface of the sealing ring (70).

12. The top cover structure according to claim 1, characterized in that, The first metal layer (421) is an aluminum component, and the second metal layer (422) and the column (41) are copper components.

13. The top cover structure according to claim 12, characterized in that, The total thickness b of the first plate (42) satisfies b≥2mm; the thickness d of the second metal layer (422) satisfies d≥0.8mm; the thickness n of the portion of the first metal layer (421) that overlaps with the projection of the second metal layer (422) in the thickness direction of the top cover plate (30) satisfies n≤1.5mm.

14. A single battery cell, characterized in that, The top cover structure includes any one of claims 1 to 13 above, wherein the first metal layer (421) has a welding area (4212) on the surface of the top cover plate (30) opposite to the second metal layer (422), the welding area (4212) being used for welding with an electrical connector (200).

15. The battery cell according to claim 14, characterized in that, The welding area (4212) on the first metal layer (421) does not coincide with the projection of the second metal layer (422) in the thickness direction of the top cover plate (30).

16. A battery, characterized in that, Includes a battery cell and an electrical connector (200) as described in any one of claims 14 to 15, wherein the electrical connector (200) is welded to the welding area (4212).

17. An electrical appliance, characterized in that, Includes the battery as described in claim 16 above.

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