Conductive module, cover assembly, and battery unit

Abstract

This invention provides a conductive module, cover assembly, and battery unit that can improve the technical challenge of metal layers easily falling off in composite electrode poles. [Solution] The present invention provides a conductive module, a cover assembly, and a battery unit. The conductive module 10a includes a first metal column 1 and a second metal layer 2 bonded to the surface of the first metal column, the second metal layer including a pole column with a clamping portion 20, and a terminal pressing block 102 connected to the pole column, the clamping portion being sandwiched between the first metal column and the terminal pressing block. The pole column is installed to include the first metal column and the second metal layer, the pole column is connected to the terminal pressing block, and a portion of the second metal layer (i.e., the clamping portion) is sandwiched between the first metal column and the terminal pressing block, thereby reducing the risk of the second metal layer separating from the first metal column.

Description

Technical Field

[0002] ,

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[0003]

[0001] This application claims the priority of a Chinese patent application with application number 202411252080.X filed with the China National Intellectual Property Administration on September 6, 2024, and the priority of a Chinese utility model application with application number 202422195822.1 filed with the China National Intellectual Property Administration on September 6, 2024, and incorporates by reference all the content described in those applications.

[0002] This application relates to the field of battery technology, and specifically relates to a conductive module, a cover assembly, and a battery cell.

Background Art

[0003] The pole is an important component that connects the inside and outside of a battery cell (also referred to as a battery unit). Usually, one end of the pole is connected to the external circuit of the battery cell, for example, connected to a busbar module through a terminal pressing block, and the other end of the pole is connected to the internal circuit of the battery cell, for example, connected to a pole tab in an electrode assembly through a current collector. Currently, the material of many poles is a single metal material. For example, the material of the positive pole is aluminum, and the material of the negative pole is copper. However, a pole made of a single metal material is likely to cause problems such as difficult welding. Taking the case where the negative pole is a pure copper pole as an example, when the pure copper pole is laser welded to a terminal pressing block, in order to reduce costs and the weight of the battery cell, the material of the terminal pressing block is usually aluminum. Since copper and aluminum have different melting points, laser welding is very likely to fail and cause cracks.

[0004] To reduce the difficulty of welding, related technologies have designed composite electrode columns. These composite electrode columns include two metal layers of different materials, positioned vertically, and joined together by friction welding or press working. For example, when the composite electrode column is a negative electrode column, it includes an aluminum layer and a copper layer. However, in such composite electrode columns, there are limitations to the bonding strength between the different metal layers, making it easy for the metal layers connected to the electrode assembly to detach and fall into the battery cell, resulting in battery cell failure. [Overview of the project] [Problems that the invention aims to solve]

[0005] Embodiments of the present invention provide a conductive module, a cover assembly, and a battery unit, thereby improving the technical problem of metal layers being prone to detachment in composite electrode poles. [Means for solving the problem]

[0006] In a first aspect, an embodiment of the present application provides a conductive module, the conductive module is, The pole column comprises a first metal column and a second metal layer bonded to the surface of the first metal column, wherein the second metal layer includes a clamping portion. Includes a terminal pressing block connected to the pole pole, The clamping portion is sandwiched between the first metal column and the terminal pressing block.

[0007] In one embodiment, the terminal pressing block has a through hole, and the terminal pressing block is placed over the pole post through the through hole.

[0008] In one embodiment, the through-hole and the pole post are connected by an interference fit.

[0009] In one embodiment, the terminal pressing block and the pole post are connected by crimping.

[0010] In one embodiment, the clamping portion is clamped between at least a portion of the hole wall of the through-hole and the first metal column.

[0011] In one embodiment, at least a portion of the hole wall of the through-hole is in direct contact with the first metal column.

[0012] In one embodiment, the hole wall of the through-hole is welded to the pole column.

[0013] In one embodiment, the second metal layer has a support surface, and the terminal pressing block is supported on the support surface.

[0014] In one embodiment, the support surface is an inclined surface, and along a direction away from the first end of the first metal column, the inclined surface gradually approaches the outer surface of the second metal layer and the outer surface of the first metal column.

[0015] In one embodiment, the inclined surface is an inclined plane, and the angle between the inclined plane and the outer surface of the second metal layer is 110° to 130°.

[0016] In one embodiment, the support surface is a stair surface, and the stair surface includes a second sub-stair surface and a first sub-stair surface that are connected in sequence, wherein the number of second sub-stair surfaces is 1 or more, and the number of first sub-stair surfaces is 1 or more.

[0017] In one embodiment, the height of the second sub-stair surface is 0.2 mm or more along the axial direction of the pole column, and / or the width of the first sub-stair surface is 0.2 mm or more along the radial direction of the pole column.

[0018] In one embodiment, the width of the support surface along the radial direction of the pole column is 0.3 mm or more and less than or equal to the average thickness of the second metal layer.

[0019] In one embodiment, a mating surface that fits the support surface is formed on the hole wall of the through-hole.

[0020] In one embodiment, the support surface is formed on the clamping portion.

[0021] In one embodiment, the terminal pressing block is covered on the first metal column through the through hole.

[0022] In one embodiment, a boss protruding in the radial direction is formed on the first metal column, the boss is used to support the terminal pressing block, the second metal layer extends to both the upper and lower sides of the boss, and the clamping portion is clamped between the boss and the terminal pressing block.

[0023] In one embodiment, the end of the second metal layer is fitted into the first metal column.

[0024] In one embodiment, the end of the second metal layer is the clamping portion.

[0025] In one embodiment, the terminal pressing block and the first metal column are made of the same material, and / or the first metal column is an aluminum column, the second metal layer is a copper layer, and / or the average thickness of the second metal layer is 3 mm or less.

[0026] In one embodiment, the first metal column has a first end and a second end facing each other, the second metal layer covers the surface of the first end and extends toward the second end, the portion of the second metal layer corresponding to the first end is used for connection with the electrode assembly, and the second end is connected to the terminal pressing block.

[0027] In one embodiment, the clamping portion is formed in an annular shape, and the clamping portion is connected to the peripheral portion of the first metal column.

[0028] As a second aspect, the embodiment of the present application provides a cover assembly, the cover assembly includes a cover and the above conductive module, the pole column is penetrated through the cover, and the terminal pressing block is located on one side of the cover.

[0029] In one embodiment, the cover assembly further includes a current collector, which is located on the opposite side of the cover from the terminal pressing block and welded to the pole post. The cover includes a cover body, a first insulating component installed between the terminal pressing block and the cover body, and a second insulating component installed between the cover body and the current collector, and / or the cover assembly further includes a sealing member installed between the cover and the pole post.

[0030] In a third aspect, an embodiment of the present application provides a battery unit comprising a housing having a housing cavity, an electrode assembly having electrode tabs and installed in the housing cavity, and a cover assembly, the cover assembly being connected to the housing and sealing the opening of the housing cavity, and the electrode poles being connected to the electrode tabs. [Effects of the Invention]

[0031] In the embodiments of the present invention, the pole column in the conductive module is installed to include a first metal column and a second metal layer, the pole column is connected to a terminal pressing block, and a portion of the second metal layer (i.e., a clamping portion) is clamped between the first metal column and the terminal pressing block, thereby restricting the position of the first metal column and the terminal pressing block relative to the clamping portion and preventing separation of the second metal layer and the first metal column. On the other hand, because the metal is malleable, when the first metal column and the terminal pressing block tighten the clamping portion, the first metal and the second metal penetrate each other, thereby making the bond between the second metal layer and the first metal column tighter. These two actions together reduce the risk of the second metal layer separating from the first metal column. [Brief explanation of the drawing]

[0032] To more clearly explain the technical concepts in the embodiments of this application, the drawings necessary for use in the description of the embodiments are briefly described below. Clearly, the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without any creative effort.

[0033] [Figure 1] This is a schematic diagram showing the cross-sectional structure of a conductive module provided in an embodiment of the present application. [Figure 2] This is a schematic diagram showing the cross-sectional structure of the pole column in Figure 1. [Figure 3] This is an enlarged view of section C in Figure 2. [Figure 4] Figure 1 is a schematic diagram showing the cross-sectional structure of the terminal pressing block. [Figure 5] This is a schematic diagram showing the cross-sectional structure of another pole column in the conductive module provided in the embodiment of the present application. [Figure 6] This is an enlarged view of section B in Figure 2. [Figure 7] This is a schematic diagram showing the cross-sectional structure of another pole column in the conductive module provided in the embodiment of the present application. [Figure 8] Figure 7 is a schematic diagram showing the cross-sectional structure of the pole column. [Figure 9] This is a schematic diagram showing the cross-sectional structure of another conductive module provided in the embodiment of the present application. [Figure 10] This is a schematic diagram showing the cross-sectional structure of another conductive module provided in the embodiment of the present application. [Figure 11] This is a schematic diagram showing the cross-sectional structure of the cover assembly provided in the embodiment of the present application. [Figure 12] This is an exploded view showing the cover assembly provided in the embodiment of the present application. [Figure 13] This is a cross-sectional view of a battery provided in an embodiment of the present application. [Modes for carrying out the invention]

[0034] The technical proposal in the embodiments of this application will be described clearly and in detail below with reference to the drawings of the embodiments. Clearly, the embodiments described herein represent only a selection of embodiments of this application, not all embodiments. All other embodiments that can be obtained by a person skilled in the art without creative effort based on the embodiments of this application are included within the scope of protection of this application.

[0035] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and interpretive purposes only and do not limit the present application. In this application, unless otherwise stated, directional terms used, such as “up” and “down,” generally refer to the top and bottom of the device in its actual use or operating state, specifically the direction in the drawings. On the other hand, “inside” and “outside” are expressions relative to the contour of the device.

[0036] The terms “first” and “second” are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features shown. Accordingly, features designated as “first” and “second” may explicitly or implicitly include one or more such features. In the description herein, “plural” means two or more unless otherwise specifically defined.

[0037] In the description of this application, unless otherwise explicitly stated or limited, the terms “attachment,” “connection,” and “connection” should be interpreted broadly. For example, these may be fixed connections, detachable connections, or integrated connections; they may be mechanical connections, electrical connections, or interconnected connections; they may be direct connections, indirect connections via an intermediate medium, or internal communication between two elements or an interaction relationship between two elements. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0038] The words “contains,” “possesses,” or any variation thereof imply non-exclusive inclusion, thereby including not only those elements but also other elements not expressly enumerated, or elements specific to that process, method, part, or apparatus. The words “contains one…” limit an element not to exclude the presence of other identical elements in a process, method, article, or apparatus that contains that element.

[0039] In the description of the embodiments of this Application, terms such as “example” or “for example” are used for illustrative, explanatory, or descriptive purposes. No embodiment or design described as “example” or “for example” in the embodiments of this Application shall be construed as being superior to or having more advantages than other embodiments or designs. The use of these terms is intended to clearly indicate relative concepts.

[0040] To facilitate understanding of the solution presented in this application, the spline curves and arrows used in the reference numerals in the drawings will be explained. Parts indicated by spline curves without arrows are physical parts, that is, parts with a physical structure. Parts indicated by spline curves with arrows are virtual parts, that is, parts without a physical structure.

[0041] Because composite pole columns contain metal layers of different materials, and the coefficients of thermal expansion between these different metals are typically different, the bonding force between the metal layers in the composite pole column decreases in high-temperature working environments, making them more prone to separating and falling off. Furthermore, since the bonding force between the metal layers in the composite pole column is affected by the bonding area, the metal layers in the composite pole column also tend to fall off more easily when the diameter of the composite pole column is relatively small.

[0042] To address the problem of metal layers in composite poles easily falling off, resulting in battery cell failure, the present invention provides a conductive module, a cover assembly, and a battery unit.

[0043] In a first embodiment, the present invention provides a conductive module that connects the internal circuit of a battery unit to the external circuit of the battery unit (also abbreviated as the external circuit), thereby enabling the battery unit to communicate with the external circuit, and allowing the external circuit to supply power to the battery unit (i.e., charging the battery unit), or the battery unit to supply power to the external circuit (i.e., discharging the battery unit). Specifically, the conductive module may be assembled into the cover of the battery unit.

[0044] Specifically, referring to Figures 1 to 13, the conductive module 10a includes a pole column 101 and a terminal pressing block 102, the terminal pressing block 102 being connected to the pole column 101. Here, the pole column 101 includes a first metal column 1 and a second metal layer 2. The second metal layer 2 is bonded to the surface of the first metal column 1. The second metal layer 2 includes a clamping portion 2a, which is sandwiched between the first metal column 1 and the terminal pressing block 102.

[0045] The pole post 101 is a component of the battery unit 1000. Specifically, the pole post 101 refers to a conductive structure in the battery unit 1000 used to connect to the electrode assembly 1200. For example, the pole post 101 is connected to the electrode tab 1210 in the electrode assembly 1200. The pole post 101 may be connected directly to the electrode tab 1210, or it may be connected to the electrode tab 1210 via another component (e.g., the current collector 120). Typically, part of the pole post 101 is located inside the battery unit 1000, and the other part is located outside the battery unit 1000.

[0046] The terminal pressing block 102 is also a component of the battery unit 1000. The terminal pressing block 102 is located outside the battery unit 1000. The terminal pressing block 102 is connected to the pole 101 and is used to further electrically connect to external structures. For example, the terminal pressing block 102 is connected to a busbar module.

[0047] Here, the connection of the terminal pressing block 102 to the pole post 101 may be by welding the terminal pressing block 102 to the pole post 101, or by interlocking the terminal pressing block 102 and the pole post 101. Of course, the method of connection between the terminal pressing block 102 and the pole post 101 may be any other specific method.

[0048] The pole column 101 includes a first metal column 1 and a second metal layer 2. As can be understood, the first metal column 1 has a columnar structure, and the material of the first metal column 1 contains the first metal. The second metal layer 2 has a layered structure, and the material of the second metal layer 2 contains the second metal. Here, the second metal and the first metal are different metals.

[0049] Bonding the second metal layer 2 to the surface of the first metal column 1 means that the second metal layer 2 is located on the outer surface of the first metal column 1 and that the second metal layer 2 is bonded to the first metal column 1. Here, bonding means that the second metal layer 2 and the first metal column 1 cannot be separated by gravity alone. For example, the second metal layer 2 and the first metal column 1 may be bonded by cold forming.

[0050] The second metal layer 2 includes a clamping portion 2a. Typically, a portion of the second metal layer 2 forms a clamping portion 2a to ensure that the second metal layer 2 on the pole column 101 can be connected to the electrode assembly 1200. Specifically, the clamping portion 2a is sandwiched between the first metal column 1 and the terminal pressing block 102, meaning that a portion of the second metal layer 2 is sandwiched between the first metal column 1 and the terminal pressing block 102.

[0051] In the conductive module 10a provided in the embodiment of the present application, the pole post 101 is installed to include a first metal column 1 and a second metal layer 2, the pole post 101 is connected to a terminal pressing block 102, and a portion of the second metal layer 2 (i.e., a clamping portion 2a) is clamped between the first metal column 1 and the terminal pressing block 102, thereby restricting the position of the first metal column 1 and the terminal pressing block 102 with respect to the clamping portion 2a and preventing separation of the second metal layer 2 and the first metal column 1. On the other hand, because metal is malleable, when the first metal column 1 and the terminal pressing block 102 tighten the clamping portion 2a, the first metal and the second metal penetrate each other, thereby making the bond between the second metal layer 2 and the first metal column 1 tighter, and these two actions together reduce the risk of the second metal layer 2 separating from the first metal column 1.

[0052] In some embodiments, the electrode column 101 is a negative electrode column 101, the first metal is aluminum, i.e., the first metal column 1 is an aluminum column, and the second metal is copper, i.e., the second metal layer 2 is a copper layer. Compared to a negative electrode column 101 made of pure copper, setting the negative electrode column 101 to include an aluminum column and a copper layer effectively reduces the cost of the negative electrode column 101.

[0053] In some embodiments, the average thickness D1 of the second metal layer 2 is 3 mm or less. By making the second metal layer 2 thinner, the manufacturing cost of the pole column 101 can be effectively reduced, and especially when the first metal column 1 is an aluminum column and the second metal layer 2 is a copper layer, the amount of more expensive copper used can be reduced, effectively lowering the cost of the pole column 101 and also reducing the weight of the pole column 101. For example, the average thickness D1 of the second metal layer 2 is 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.5 mm, 2.8 mm, or 3.0 mm.

[0054] In some embodiments, the terminal pressing block 102 and the first metal column 1 are made of the same material. By designing the terminal pressing block 102 and the first metal column 1 to be manufactured from the same material, localized melting of the terminal pressing block 102 and the first metal column 1 can be achieved at the same temperature, and the risk of cracking due to thermal expansion at the welded area between the terminal pressing block 102 and the first metal column 1 can also be reduced. For example, if the pole column 101 includes an aluminum column and a copper layer, and the terminal pressing block 102 is an aluminum terminal pressing block 102, welding the aluminum column to the aluminum terminal pressing block 102 can reduce the difficulty of welding and improve the reliability of the weld.

[0055] In some embodiments, when the pole column 101 is cut along its radial direction, the cross-sectional shape of the pole column 101 may be one of the following: square, circular, hexagonal, or runaway.

[0056] In some embodiments, referring to Figures 1 to 10, the first metal column 1 has opposing ends, a first end 11 and a second end 12, where the second metal layer 2 covers the surface of the first end 11 and extends from the surface of the first end 11 toward the second end 12. The portion of the second metal layer 2 in the pole column 101 corresponding to the first end 11 is used to connect to a pole tab 1210 connected to an electrode assembly 1200, and the second end 12 is connected to a terminal pressing block 102. Here, the extension of the second metal layer 2 from the surface of the first end 11 toward the second end 12 means, specifically, that the end 20 of the second metal layer 2 extends toward the second end 12, or that the end 20 of the second metal layer 2 extends to the second end 12, or that the end 20 of the second metal layer 2 is located between the first end 11 and the second end 12. In a possible configuration, the end 20 of the second metal layer 2 extends to the second end 12, but the second metal layer 2 does not completely cover the second end 12, meaning that at least a portion of the second end 12 is exposed outside the second metal layer 2, thereby facilitating a direct connection, such as welding, between the second end 12 and the terminal pressing block 102. Here, the end 20 of the second metal layer 2 refers to the edge portion of the second metal layer 2. By having the second metal layer 2 extend from the first end 11 to the second end 12 of the first metal column 1, the bonding area between the second metal layer 2 and the first metal column 1 can be effectively increased compared to a configuration in which the second metal layer 2 is installed only on the end face of one end of the first metal column 1, thereby reducing the risk of the second metal layer 2 falling off and improving the current conducting performance of the pole column 101.

[0057] When the conductive module 10a is applied to the battery unit 1000, the first end 11 of the first metal column 1 faces inward towards the battery unit 1000 and the second end 12 faces outward towards the battery unit 1000. The second metal layer 2 covers the first end 11 of the first metal column 1, and the first end 11 extends toward the second end 12. As a result, the second metal layer 2 acts as a protective layer, isolating the first end 11 of the first metal column 1 from the electrolyte in the battery unit 1000 and reducing the risk of the first end 11 being corroded by the electrolyte.

[0058] In some embodiments, referring to Figures 1 to 4, a through-hole 1021 is provided in the terminal pressing block 102, and the terminal pressing block 102 is placed over the pole post 101 via the through-hole 1021. In other words, the pole post 101 is inserted through the terminal pressing block 1021. For example, one end of the pole post 101 (specifically the first end 11 of the first metal post 1) penetrates into the through-hole 1021, and the terminal pressing block 102 is placed over one end of the pole post 101. By placing the terminal pressing block 102 over the pole post 101, the height of the conductive module 10a is appropriately reduced, and the terminal pressing block 102 can also restrict the position of the pole post 101.

[0059] In some embodiments, the through-hole 1021 and the pole post 101 are connected by an interference fit. This ensures a tight fit between the terminal pressing block 102 and the pole post 101, improving the thrust resistance and torsional resistance of the pole post 101. Furthermore, the interference fit method eliminates the need for additional connecting parts, simplifying the structure and providing a highly reliable connection method.

[0060] In some embodiments, the terminal pressing block 102 is joined to the pole post 101 by crimping. For example, the assembly process is as follows: One end of the pole post 101 is inserted into the through-hole 1021 of the terminal pressing block 102, at which time a gap fit may be used between the pole post 101 and the through-hole 1021, and the pole post 101 is riveted to the through-hole 1021 by a crimping process. Specifically, during the crimping process, a crimping device is used to press the pole post 101 along its axial direction. As the pole post 101 is pressed, it deforms, contracting along the axial direction but expanding radially. At this time, the portion of the pole post 101 located inside the through-hole 1021 fills the gap between the pole post 101 and the through-hole 1021, and presses against the hole wall 1022 of the through-hole 1021, thereby achieving a tight fit between the pole post 101 and the through-hole 1021. On the other hand, the portion of the pole post 101 located outside the through-hole 1021 forms a retaining step that is secured to the terminal pressing block 102. In other words, the pole post 101 is equivalent to a rivet, thereby improving the reliability of the connection between the terminal pressing block 102 and the pole post 101 and reducing the risk of the pole post 101 separating from the terminal pressing block 102. In a possible configuration, during the crimping process, the terminal pressing block 102 is fixed in place by a clamping tool and cannot be moved.

[0061] In some embodiments, referring to Figures 1 to 4, a clamping portion 2a is clamped between at least a portion of the hole wall 1022 of the through-hole 1021 and the first metal column 1. That is, the clamping portion 2a is located between the hole wall 1022 of the through-hole 1021 and the first metal column 1, and the inner surface of the hole wall 1022 of the through-hole 1021 may be partially covered by the clamping portion 2a or may be entirely covered by the clamping portion 2a, i.e., the space between the inner surface of the hole wall 1022 of the through-hole 1021 and the outer surface of the first metal column 1 may be partially or completely isolated by the clamping portion 2a. In other words, referring to Figure 1, along the axial direction of the pole column 101, the highest position of the clamping portion 2a is higher than the lowest position of the hole wall 1022 of the through-hole 1021. The clamping portion 2a is installed between the hole wall 1022 of the through-hole 1021 and the first metal column 1, and the through-hole 1021 and the pole column 101 are joined by an interlocking fit. This promotes mutual penetration between the first metal in the first metal column 1 and the second metal in the clamping portion 2a, causing the bonding interface between the first metal column 1 and the clamping portion 2a to deform, forming a deformed and interlocked bonding interface, increasing the bonding surface area, and improving the bonding strength. Furthermore, the clamping portion 2a can be further deformed and extended by the action of the tightening force between the hole wall 1022 and the pole column 101, and the bonding area between the second metal layer 2 and the first metal column 1 can also be increased. Furthermore, if the terminal pressing block 102 is also a metal part, when the through-hole 1021 and the pole column 101 are joined by a crimp fit, the metal in the terminal pressing block 102 can also penetrate the clamping portion 2a. This forms a deformed and interlocked bonding interface between the hole wall 1022 of the through-hole 1021 and the clamping portion 2a, increasing the bonding area and improving the bonding strength. Therefore, by increasing the bonding area between the second metal layer 2 and the first metal column 1 and / or the terminal pressing block 102, the bonding strength of the bonding surface is improved, reducing the risk of the second metal layer 2 separating from the first metal column 1. In addition, the current conducting performance of the bonding surface is improved, and the current conducting performance of the conductive module 10a is also improved.

[0062] In some embodiments, referring to Figures 1 to 4, a portion of the hole wall 1022 of the through-hole 1021 is in direct contact with the first metal column 1, that is, only a portion of the inner surface of the hole wall 1022 of the through-hole 1021 is covered by the clamping portion 2a. By reserving direct contact between a portion of the hole wall 1022 of the through-hole 1021 and the first metal column 1, welding between the hole wall 1022 of the through-hole 1021 and the first metal column 1 is facilitated. In particular, if the terminal pressing block 102 and the first metal column 1 are made of the same material, the difficulty of welding can be effectively reduced. For example, the second end 12 of the first metal column 1 penetrates into the through-hole 1021, and a portion of the hole wall 1022 of the through-hole 1021 is in direct contact with a portion of the side surface of the second end 12, specifically a portion of the side surface of the second end 12 near the end face of the second end 12.

[0063] In some embodiments, the terminal pressing block 102 is placed over the first metal column 1 via a through-hole 1021. Some of the holes 1022 of the through-hole 1021 may be in direct contact with the first metal column 1, or all of the holes 1022 of the through-hole 1021 may be in direct contact with the first metal column 1, i.e., there may be no second metal layer 2 between the holes 1022 of the through-hole 1021 and the first metal column 1. Placing the terminal pressing block 102 over the first metal column 1 via the through-hole 1021 facilitates welding the terminal pressing block 102 to the first metal column 1, for example, by laser welding.

[0064] In some embodiments, the hole wall 1022 of the through-hole 1021 is welded to the pole column 101. Welding effectively ensures the reliability of the connection between the terminal pressing block 102 and the pole column 101. For example, the hole wall 1022 of the through-hole 1021 and the pole column 101 are welded to each other by laser welding. In a possible configuration, the hole wall 1022 of the through-hole 1021 and the first metal column 1 in the pole column 101 are directly welded to each other.

[0065] In some embodiments, the hole wall 1022 of the through-hole 1021 is welded to the pole column 101, and the through-hole 1021 and the pole column 101 are joined by an interference fit. The double connection improves the reliability of the connection.

[0066] In some embodiments, referring to Figures 1 to 8, the second metal layer 2 has a support surface 203, and the terminal pressing block 102 is supported on the support surface 203. Specifically, the support surface 203 is connected to the outer surface of the second metal layer 2, and the outer surface of the second metal layer 2 includes the outer surface of the second metal layer 2 and the support surface 203; that is, the support surface 203 is part of the outer surface of the second metal layer 2. The terminal pressing block 102 is placed over the pole column 101 via a through hole 1021, and the terminal pressing block 102 is supported on the support surface 203. When the hole wall 1022 of the through hole 1021 and the pole column 101 are welded by laser welding, if there is a gap between the hole wall 1022 of the through hole 1021 and the pole column 101 before welding, the support surface 203 can form the bottom of the gap and block the laser during welding, reducing the risk of the laser penetrating. Possible configurations include the support surface 203 being at least one of the following: a stair surface 2032, a flat surface, and a curved surface.

[0067] In some embodiments, referring to Figures 1 to 4, the support surface 203 is an inclined surface 2031, and along the direction away from the first end 11 of the first metal column 1, the inclined surface 2031 gradually approaches the outer surface of the first metal column 1 from the outer surface of the second metal layer 2. Here, the inclined surface 2031 may be an inclined plane or an inclined curved surface. For example, the inclined curved surface is an inclined arc surface, where the inclined arc surface may be a convex arc surface along the direction away from the second metal layer 2, or a concave arc surface along the direction closer to the second metal layer 2. The support surface 203 is installed as an inclined surface 2031, and as the inclined surface 2031 gradually approaches the first metal column 1 in a direction away from the first end 11, when the terminal pressing block 102 is supported by the inclined surface 2031, the terminal pressing block 102 applies an inward partial pressure along the radial direction of the pole column 101 to the inclined surface 2031, causing the portion of the second metal layer 2 corresponding to the inclined surface 2031 to adhere more closely to the first metal column 1, thereby reducing the risk of the second metal layer 2 separating.

[0068] In some embodiments, referring to Figure 3, the inclined surface 2031 is an inclined plane, and the angle α between the inclined plane and the outer surface of the second metal layer 2 is 110° to 130°. Because the angle α is within this range, a deformed and interlocked bonding interface is formed between the second metal layer 2 and the first metal column 1 by the action of the radially inward partial pressure applied by the terminal pressing block 102, thereby improving the bonding effect between the second metal layer 2 and the first metal column 1. Examples of angles α include 110°, 115°, 120°, 125°, or 130°.

[0069] In some embodiments, referring to Figures 5 to 8, the support surface 203 is a stair surface 2032, which includes a second sub-stair surface 20322 and a first sub-stair surface 20321 that are sequentially connected. Here, the first sub-stair surface 20321 refers to a surface extending along a first direction, and the second sub-stair surface 20322 refers to a surface extending along a second direction, with the first direction intersecting the second direction. In a possible configuration, the first direction is perpendicular to the second direction. For example, the first direction is the radial direction of the pole column 101, and the second direction is the axial direction of the pole column 101. In a possible configuration, both the second sub-stair surface 20322 and the first sub-stair surface 20321 are planar. The number of second sub-stair surfaces 20322 is one or more, and the number of first sub-stair surfaces 20321 is one or more. In other words, the number of second sub-stair surfaces 20322 may be one or more, and the number of first sub-stair surfaces 20321 may also be one or more. Here, "multiple" refers to two or more. If there is one second sub-stair surface 20322, the number of first sub-stair surfaces 20321 is also one, and the resulting stair surface 2032 is a single-step stair surface 2032. If the number of at least one of the second sub-stair surfaces 20322 and the first sub-stair surfaces 20321 is multiple, the resulting stair surface 2032 is a multi-step stair surface 2032. For example, the number of second sub-stair surfaces 20322 is two, and the number of first sub-stair surfaces 20321 is also two. In a single-step stair surface 2032, the second sub-stair surface 20322 and the first sub-stair surface 20321 are connected sequentially. In a multi-step stair surface 2032, the second sub-stair surface 20322 and the first sub-stair surface 20321 are connected alternately in sequence. By installing the support surface 203 as a stair surface 2032, the stability of the combination between the terminal pressing block 102 and the pole column 101 can be improved, and the risk of laser penetration during laser welding can be reduced.

[0070] In some embodiments, referring to Figure 6, the height H21 of the second sub-stair surface 20322 is 0.2 mm or more along the axial direction of the pole column 101. If the height H21 of the second sub-stair surface 20322 is too small, it becomes difficult to form the stair surface 2032 and the stair surface 2032 becomes more prone to fracture. For example, the height H21 of the second sub-stair surface 20322 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0071] In some embodiments, referring to Figure 6, the width W21 of the first sub-stair surface 20321 along the radial direction of the pole column 101 is 0.2 mm or more. If the width W21 of the first sub-stair surface 20321 is too small, it becomes difficult to form the stair surface 2032 and the stair surface 2032 becomes more prone to destruction. For example, the width W21 of the first sub-stair surface 20321 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0072] In some embodiments, referring to Figure 3, the width W2 of the support surface 203 along the radial direction of the pole column 101 is 0.3 mm or more and less than or equal to the average thickness D1 of the second metal layer 2. In the radial direction of the pole column 101, the maximum value of the width W2 of the support surface 203 is limited by the average thickness D1 of the second metal layer 2, but the minimum value of the width W2 of the support surface 203 is relevant to the design of the support surface 203. If the minimum value is too small, it will affect the support effect of the support surface 203 on the terminal pressing block 102, and consequently affect the laser shielding effect of the second metal layer 2 during laser welding. For example, the width W2 of the support surface 203 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.5 mm, 2.8 mm, or 3.0 mm.

[0073] In some embodiments, referring to Figure 4, a mating surface 1023 is formed on the hole wall 1022 of the through-hole 1021 that conforms to the support surface 203. When the support surface 203 is an inclined surface 2031, the mating surface 1023 is an inclined mating surface 1023 that conforms to the inclined surface 2031. When the support surface 203 is a stepped surface 2032, the mating surface 1023 is a stepped mating surface 1023 that conforms to the stepped surface 2032. By utilizing the complementarity between the support surface 203 and the mating surface 1023, the stability of the combination between the terminal pressing block 102 and the pole column 101 is effectively improved, and the risk of laser penetration during laser welding is reduced. Furthermore, when the support surface 203 is an inclined plane, the inclined plane and the mating surface 1023 conform to each other, acting as a guide and further improving the reliability of the combination between the terminal pressing block 102 and the pole column 101.

[0074] In some embodiments, referring to Figure 1, the support surface 203 is formed on the clamping portion 2a. That is, the clamping portion 2a is not only clamped between the first metal column 1 and the terminal pressing block 102, but the clamping portion 2a also supports the terminal pressing block 102, thereby greatly simplifying the structure of the pole column 101. In particular, when the inclined surface 2031 is supported, the partial pressure that the terminal pressing block 102 applies to the inclined surface 2031 acts together with the clamping force between the terminal pressing block 102 and the first metal column 1, promoting the formation of a deformed and interlocked bonding surface between the clamping portion 2a and the first metal column 1, and reducing the risk of the second metal layer 2 separating.

[0075] In some embodiments, referring to Figures 1 to 8, the end portion 20 of the second metal layer 2 is a clamping portion 2a. That is, the end portion 20 of the second metal layer 2 is clamped between the terminal pressing block 102 and the first metal column 1, and since the end portion 20 of the second metal layer 2 is the edge of the second metal layer 2, when the end portion 20 of the second metal layer 2 is tightened and deformed, the end portion 20 of the second metal layer 2 continues to extend toward the side away from the body of the second metal layer 2, thereby increasing the bonding area of ​​the second metal layer 2. Furthermore, since the bonding between the end portion 20 of the second metal layer 2 and the first metal column 1 usually tends to form a thin and weak portion, the risk of the second metal layer 2 separating is reduced by further improving the bonding strength between the end portion 20 of the second metal layer 2 and the first metal column 1.

[0076] In some embodiments, the end 20 of the second metal layer 2 is a convex ring, which is placed over the first metal column 1 and sandwiched between the first metal column 1 and the terminal pressing block 102.

[0077] In some embodiments, the end portion 20 of the second metal layer 2 is a convex sheet, and there are multiple convex sheets, which are distributed at intervals around the periphery of the first metal column 1, and the convex sheets are sandwiched between the first metal column 1 and the terminal pressing block 102.

[0078] In some embodiments, as shown in Figures 1 to 8, the end portion 20 of the second metal layer 2 is embedded within the first metal column 1. Since the bonding between the end portion 20 of the second metal layer 2 and the first metal column 1 usually tends to form a thin and weak portion, embedding the end portion 20 of the second metal layer 2 into the first metal column 1 increases the bonding area between the end portion 20 of the second metal layer 2 and the first metal column 1, improving the bonding strength. Furthermore, by concealing the end portion 20 of the second metal layer 2 within the first metal column 1, scratching of the end portion 20 of the second metal layer 2 by external forces is reduced, thereby reducing the risk of the second metal layer 2 separating.

[0079] In some embodiments, referring to Figures 8 and 9, a radially projecting boss 13 is formed on the first metal column 1. Specifically, a local portion of the first metal column 1 projects outward approximately along the radial direction of the first metal column 1 to form the boss 13. For example, the angular deviation between the boss 13 and the first metal column 1 in the radial direction is within ±15°. The boss 13 is used to support the terminal pressing block 102, and it is not necessary for the boss 13 and the terminal pressing block 102 to be in direct contact. The second metal layer 2 extending to both the upper and lower sides of the boss 13 means that the entire surface of the boss 13 may be covered by the second metal layer 2, or a portion of the surface of the boss 13 may be covered by the second metal layer 2; that is, the end 20 of the second metal layer 2 may extend beyond the boss 13 and may be located above the boss 13. Here, the upper side of the boss 13 refers to the surface of the boss 13 that is closer to the second end 12, and the lower side of the boss 13 refers to the surface of the boss 13 that is further away from the second end 12. Regardless of the relationship between the end 20 of the second metal layer 2 and the boss 13, at least the gripping portion 2a is located on the side of the boss 13 that faces the terminal pressing block 102, and when the terminal pressing block 102 is supported by the boss 13, the gripping portion 2a is gripped between the terminal pressing block 102 and the boss 13 of the first metal column 1.

[0080] Here, the boss 13 may be located at the first end 11 of the first metal column 1, at the second end 12 of the first metal column 1, or between the first end 11 and the second end 12 of the first metal column 1. To understand this, if the boss 13 is located at the first end 11 or the second end 12 of the first metal column 1, cutting the first metal column 1 along its axial direction will result in a cross-section of the first metal column 1 that is either a regular T-shape or an inverted T-shape. If the boss 13 is located between the first end 11 and the second end 12, cutting the first metal column 1 along its axial direction will result in a cross-section of the first metal column 1 that is either a center or a curved shape.

[0081] To simplify the explanation, in the following, the face closest to the first end 11 will be referred to as the bottom face (i.e., the lower side), and the face further away from the first end 11 will be referred to as the top face (i.e., the upper side).

[0082] As an example, referring to Figure 10, the boss 13 is located at the second end 12 of the first metal column 1, and the end 20 of the second metal layer 2 extends to the top surface of the boss 13. However, the second metal layer 2 does not cover the end face of the second end 12, and the outer surface of the end 20 of the second metal layer 2 is flush with the end face of the second end 12, so that the end face of the second end 12 is exposed to the outside and forms a welding area. The terminal pressing block 102 is supported by the boss 13, and the end 20 of the second metal layer 2 (the end 20 is referred to as the clamping portion 2a) is clamped between the top surface of the boss 13 and the bottom surface of the terminal pressing block 102, and a part of the bottom surface of the terminal pressing block 102 is welded to the welding area.

[0083] As an example, referring to Figure 9, the boss 13 is located between the first end 11 and the second end 12 of the first metal column 1, the end 20 of the second metal layer 2 extends to the top surface of the boss 13, the terminal pressing block 102 is supported by the boss 13, the end 20 of the second metal layer 2 (the end 20 is designated as the clamping portion 2a) is clamped between the top surface of the boss 13 and the bottom surface of the terminal pressing block 102, a through hole 1021 is made in the terminal pressing block 102, the second end 12 of the first metal column 1 penetrates into the through hole 1021 and is welded to the inner wall of the through hole 1021.

[0084] As an example, a boss 13 is located at the first end 11 of the first metal column 1, the second metal layer 2 completely covers the first end 11, the end 20 of the second metal layer 2 extends to the outer surface of the second end 12, the terminal pressing block 102 is supported by the boss 13, a portion of the second metal layer 2 (this portion is referred to as the clamping portion 2a and, for distinction, as the first clamping portion) is clamped between the top surface of the boss 13 and the bottom surface of the terminal pressing block 102, a through hole 1021 is made in the terminal pressing block 102, the second end 12 of the first metal column 1 penetrates into the through hole 1021 and is joined to the through hole 1021 by an interference fit. The end 20 of the second metal layer 2 (the end 20 also functions as the clamping portion 2a and is referred to as the second clamping portion) is clamped between the inner wall of the through hole 1021 and the first metal column 1.

[0085] To make it easier to understand, the number of clamping portions 2a may be one or multiple. For example, the clamping portion 2a may include only the first clamping portion, only the second clamping portion, or both the first and second clamping portions.

[0086] In some embodiments, the manufacturing process of the conductive module 10a may include the following: manufacturing poles 101, pre-assembling terminal pressing blocks 102 with poles 101 so that terminal pressing blocks 102 are supported by bosses 13 and a portion of the second metal layer 2 is positioned between terminal pressing blocks 102 and bosses 13, pressing terminal pressing blocks 102 against bosses 13, and connecting terminal pressing blocks 102 to poles 101.

[0087] In some embodiments, the clamping portion 2a is formed in an annular shape and is connected to the periphery of the first metal column 1. By forming the clamping portion 2a in an annular shape, the contact area of ​​the circumferential surface between the clamping portion 2a and the first metal column 1 is increased, improving the bonding area between the second metal layer 2 and the first metal column 1, reducing the risk of the second metal layer 2 falling off, and effectively reducing the difficulty of manufacturing the pole column 101. Of course, in other embodiments, the clamping portion 2a may be configured to include a plurality of convex sheets, which are distributed at intervals around the periphery of the first metal column 1, and the convex sheets are clamped between the first metal column 1 and the terminal pressing block 102.

[0088] In a second embodiment, referring to Figures 11 to 13, the embodiment of the present application further provides a cover assembly 100. The cover assembly 100 is used to combine with the housing 1100 of a battery unit 1000 to form a sealed housing cavity. The housing cavity is used to house the electrode assembly 1200 of the battery unit 1000.

[0089] Specifically, referring to Figures 11 and 12, the cover assembly 100 includes the cover 110 and the conductive module 10a, the conductive module 10a being connected to the cover 110. Specifically, the pole posts 101 in the conductive module 10a are inserted through the cover 110, and the terminal pressing blocks 102 in the conductive module 10a are located on one side of the cover 110.

[0090] Specifically, along the thickness direction of the cover 110, the cover 110 has opposing first and second surfaces. When the cover assembly 100 is attached to the housing 1100 of the battery unit 1000, the first surface is the surface away from the housing 1100, and the second surface is the surface closer to the housing 1100. Here, the terminal pressing block 102 is located on the first surface of the cover 110. Along the thickness direction of the cover 110, mounting holes 114 are installed through the cover 110, and the pole posts 101 are inserted through the cover 110 via the mounting holes 114.

[0091] In some embodiments, the cover assembly 100 further includes a current collector 120. The current collector 120 is a conductive component used to connect to the electrode tabs 1210 of the electrode assembly 1200 in the battery unit 1000. The current collector 120 is located on one side of the cover 110, specifically on the side of the cover 110 away from the terminal pressing block 102, i.e., the current collector 120 is located on the second surface of the cover 110. The current collector 120 is welded to the electrode post 101, specifically, the current collector 120 is welded to the second metal layer 2 on the electrode post 101. A possible configuration is that the material of the current collector 120 and the material of the second metal layer 2 are the same, i.e., the material of the current collector 120 is the second metal, which reduces the difficulty of welding the current collector 120 to the second metal layer 2 and improves the reliability of the weld.

[0092] In some embodiments, the current collector 120 includes at least one of a current collector disk and a connecting sheet.

[0093] In some embodiments, the current collector 120 includes a current collector body 1201 and a connecting sheet 1202, where the current collector body 1201 is connected to the connecting sheet 1202, and the current collector body 1201 is used to connect to the pole tab 1210 of the electrode assembly 1200, and the connecting sheet 1202 is connected to the pole pole 101.

[0094] In some embodiments, the cover 110 includes a cover body 111, a first insulating component 112, and a second insulating component 113, where the first insulating component 112 and the second insulating component 113 are located on opposite sides of the cover body 111. More specifically, the first insulating component 112 is installed between the terminal pressing block 102 and the cover body 111, and the second insulating component 113 is installed between the cover body 111 and the current collector 120. The cover 110 is provided with mounting holes 114, which penetrate the cover body 111, the first insulating component 112, and the second insulating component 113. For example, the cover body 111 is a light-colored aluminum sheet, and both the first insulating component 112 and the second insulating component 113 are plastic components.

[0095] In some embodiments, the cover assembly 100 further includes a sealing member 130, which is positioned between the cover 110 and the pole post 101 to seal the gap between the pole post 101 and the mounting hole 114, thereby preventing electrolyte leakage. For example, the sealing member 130 is located between the cover body 111 and the second insulating component 113.

[0096] In some embodiments, the assembly process of the cover assembly 100 includes the following: stacking the second insulating component 113, the sealing member 130, the cover body 111, and the first insulating component 112 sequentially from bottom to top with their holes aligned; passing the pole post 101 of the conductive module 10a through the mounting hole 114 from top to bottom; bringing the terminal pressing block 102 on the conductive module 10a into contact with the first insulating component 112; attaching the current collector 120 to the side of the second insulating component 113 away from the sealing member 130; and welding the current collector 120 and the pole post 101 by laser welding.

[0097] In some embodiments, the cover assembly 100 further includes an explosion-proof valve 140, which is installed in the cover 110.

[0098] In some embodiments, the cover 110 is further provided with an injection hole 115 and a sealing structure (not shown) used to seal the injection hole.

[0099] In a third aspect, the embodiment of the present application further provides a battery unit 1000, which is also referred to as a battery cell, and the battery unit 1000 refers to a basic unit that realizes the interconversion of chemical energy and electrical energy.

[0100] Specifically, referring to Figure 13, the battery unit 1000 includes a housing 1100, an electrode assembly 1200, and the cover assembly 100. Specifically, the housing 1100 has a housing cavity 1110, the electrode assembly 1200 is installed inside the housing cavity 1110, and the cover assembly 100 is connected to the housing 1100 and seals the opening of the housing cavity 1110. The electrode assembly 1200 includes electrode tabs 1210, and electrode posts 101 are connected to electrode tabs 1210.

[0101] Specifically, the electrode assembly 1200 further includes an electrode sheet and a separator, with an electrode tab 1210 connected to the electrode sheet, the electrode sheet including a positive electrode sheet and a negative electrode sheet, and the separator positioned between the positive electrode sheet and the negative electrode sheet. To make it clear, the electrode tab 1210 also includes a positive electrode tab and a negative electrode tab, where the positive electrode tab is connected to the positive electrode sheet and the negative electrode tab is connected to the negative electrode sheet. Similarly, the electrode column 101 also includes a positive electrode column and a negative electrode column, with the positive electrode tab connected to the positive electrode column and the negative electrode tab connected to the negative electrode column.

[0102] Furthermore, the battery unit 1000 contains an electrolyte, which is located in the housing cavity 1110, and the electrode assembly 1200 is impregnated in the electrolyte.

[0103] Although embodiments of the present application have been described in detail above, this specification uses specific examples to describe the principles and embodiments of the present application, and the descriptions of the above embodiments are intended solely to aid in understanding the method and core idea of ​​the present application. Furthermore, those skilled in the art will know that specific embodiments and scopes of application can be modified based on the idea of ​​the present application, and therefore, the descriptions in this specification should not be construed as limiting the present application. [Explanation of symbols]

[0104] 10a: Conductive module 101: Polar pillar 1: 1st metal pillar 11: 1st end 12: 2nd end 13: Boss 2: Second metal layer 20: End 2a: Narrow holding part 203: Support surface 2031: Inclined surface 2032: Stair surface 20321: First sub-staircase surface 20322: Second sub-staircase surface 102: Terminal pressing block 1021: Through-hole 1022: Hole wall 1023: mating surface 100: Cover Assembly 110: Cover 111: Cover body 112: First insulating component 113: Second insulating component 114: Mounting holes 115: Liquid injection hole 120: Current collector 1201: Current collector body 1202: Connection Sheet 130: Sealing member 140: Explosion-proof valve 1000: Single battery 1100: Cabinet 1110: Containment Cavity 1200: Electrode Assembly 1210: Extreme Tab

Claims

1. The pole column comprises a first metal column and a second metal layer bonded to the surface of the first metal column, wherein the second metal layer includes a clamping portion. Includes a terminal pressing block connected to the pole pole, The clamping portion is sandwiched between the first metal column and the terminal pressing block. Conductive module.

2. The terminal pressing block has a through hole, and the terminal pressing block is placed over the pole post through the through hole. The conductive module according to claim 1.

3. The through-hole and the pole post are connected by an interference fit. The conductive module according to claim 2.

4. The terminal pressing block and the pole post are connected by crimping. The conductive module according to claim 3.

5. The clamping portion is clamped between at least a portion of the hole wall of the through-hole and the first metal column. The conductive module according to claim 2.

6. At least a portion of the hole wall of the through-hole is in direct contact with the first metal column. The conductive module according to claim 5.

7. The hole wall of the through-hole is welded to the pole column. A conductive module according to any one of claims 2 to 6.

8. The second metal layer has a support surface, and the terminal pressing block is supported on the support surface. A conductive module according to any one of claims 2 to 6.

9. The support surface is an inclined surface, and along the direction away from the first end of the first metal column, the inclined surface gradually approaches the outer surface of the second metal layer from the outer surface of the first metal column. The conductive module according to claim 8.

10. The inclined surface is an inclined plane, and the angle between the inclined plane and the outer surface of the second metal layer is 110° to 130°. The conductive module according to claim 9.

11. The support surface is a stair surface, and the stair surface includes a first sub-stair surface and a second sub-stair surface that are connected in sequence, the number of the second sub-stair surfaces is one or more, and the number of the first sub-stair surfaces is one or more. The conductive module according to claim 8.

12. Along the axial direction of the pole column, the height of the second sub-stair surface is 0.2 mm or more, and / or along the radial direction of the pole column, the width of the first sub-stair surface is 0.2 mm or more. The conductive module according to claim 11.

13. Along the radial direction of the pole column, the width of the support surface is 0.3 mm or more and less than or equal to the average thickness of the second metal layer. The conductive module according to claim 8.

14. A mating surface that fits the support surface is formed on the hole wall of the through-hole. The conductive module according to claim 8.

15. The support surface is formed in the clamping portion. The conductive module according to claim 8.

16. The terminal pressing block is placed over the first metal column via the through-hole. A conductive module according to any one of claims 2 to 6.

17. The first metal column has a boss that protrudes radially, and the boss is used to support the terminal pressing block. The second metal layer extends to both the upper and lower sides of the boss, and the clamping portion is clamped between the boss and the terminal pressing block. A conductive module according to any one of claims 1 to 6.

18. The end of the second metal layer is fitted into the first metal column. A conductive module according to any one of claims 1 to 6.

19. The end of the second metal layer is the clamping portion. A conductive module according to any one of claims 1 to 6.

20. The terminal pressing block and the first metal column are made of the same material, and / or the first metal column is an aluminum column, the second metal layer is a copper layer, and / or the average thickness of the second metal layer is 3 mm or less. A conductive module according to any one of claims 1 to 6.

21. The first metal column has opposing first and second ends, the second metal layer covers the surface of the first end and extends toward the second end, the portion of the second metal layer corresponding to the first end is used for connection to the electrode assembly, and the second end is connected to the terminal pressing block. A conductive module according to any one of claims 1 to 6.

22. The clamping portion is formed in an annular shape and is connected to the circumferential portion of the first metal column. A conductive module according to any one of claims 1 to 6.

23. The cover and, A conductive module according to any one of claims 1 to 6, The pole post is inserted through the cover, and the terminal pressing block is located on one side of the cover. Cover assembly.

24. The cover assembly is The cover further includes a current collector located on the opposite side of the terminal pressing block and welded to the pole column, The aforementioned cover is The cover body and A first insulating component is installed between the terminal pressing block and the cover body, This includes a second insulating component installed between the cover body and the current collector, and / or, The cover assembly further includes a sealing member installed between the cover and the pole post. The cover assembly according to claim 23.

25. A housing having an enclosure, Installed within the aforementioned housing cavity, the electrode assembly includes electrode tabs, The cover assembly described in claim 23, The cover assembly is connected to the housing and seals the opening of the housing cavity, and the pole poles are connected to the pole tabs. Battery only.

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