Conductive module, cover plate assembly and battery cell

Abstract

The utility model provides a conductive module, a cover plate assembly and a battery cell. The conductive module comprises a pole, the pole comprises a first metal column and a second metal layer combined on the surface of the first metal column, and the second metal layer comprises a clamping part; and the terminal pressing block is connected with the pole, and the clamping part is clamped between the first metal column and the terminal pressing block. The pole comprises the first metal column and the second metal layer, the pole is connected with the terminal pressing block, and a part (namely the clamping part) of the second metal layer is clamped between the first metal column and the terminal pressing block, so that the risk that the second metal layer is separated from the first metal column is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a conductive module, a cover plate assembly and a battery cell. BACKGROUND

[0002] The pole is an important part for connecting the inside and outside of the battery cell (also known as a battery cell). One end of the pole is connected to the external circuit of the battery cell, for example, through the terminal pressing block and the module pad. The other end of the pole is connected to the internal circuit of the battery cell, for example, through the current collector and the pole lug in the electrode assembly. At present, the material of most poles is single metal material, for example, the material of the positive pole is aluminum material, and the material of the negative pole is copper material. However, the pole with single metal material is prone to welding difficulty. Taking the negative pole as an example, when the pure copper pole is welded with the terminal pressing block by laser, in order to reduce the cost and the weight of the battery cell, the material of the terminal pressing block is generally aluminum. Since the melting points of copper and aluminum are different, laser welding is prone to failure, resulting in cracking.

[0003] In order to reduce the welding difficulty, a composite pole is designed in the related technology, which includes two metal layers arranged in an up-down manner and having different materials, and the different metal layers are combined together by friction welding or stamping. Taking the composite pole as a negative pole as an example, the composite pole includes an aluminum layer and a copper layer. However, the bonding strength between the different metal layers in the composite pole is limited, which causes the metal layer connected with the electrode assembly to easily fall off and fall into the inside of the battery cell, thereby causing the battery cell to fail. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a conductive module, a cover plate assembly and a battery cell, which can improve the technical problem that the metal layer in the composite pole is prone to fall off.

[0005] In a first aspect, embodiments of the present application provide a conductive module, comprising:

[0006] A pole, the pole comprising a first metal pole and a second metal layer combined on the surface of the first metal pole, the second metal layer comprising a clamping portion;

[0007] A terminal pressing block connected with the pole, the clamping portion being clamped between the first metal pole and the terminal pressing block.

[0008] In an embodiment, a through hole is formed on the terminal pressing block, and the terminal pressing block is sleeved on the pole through the through hole.

[0009] In an embodiment, the through hole is in interference fit with the pole.

[0010] In an embodiment, the terminal pressing block and the pole are fixed by pressure riveting.

[0011] In an embodiment, the clamping portion is clamped between the hole wall of the through hole and the first metal column.

[0012] In an embodiment, the hole wall of the through hole is in direct contact with the first metal column.

[0013] In an embodiment, the hole wall of the through hole is welded with the pole column.

[0014] In an embodiment, the second metal layer has a support surface, and the terminal pressing block is supported on the support surface.

[0015] In an embodiment, the support surface is an inclined surface, and the inclined surface gradually approaches the outer side surface of the first metal column from the outer side surface of the second metal layer in a direction away from the first end of the first metal column.

[0016] In an embodiment, the inclined surface is an inclined straight surface, and the included angle between the inclined straight surface and the outer side surface of the second metal layer is 110°-130°.

[0017] In an embodiment, the support surface is a stepped surface, and the stepped surface comprises a second sub-stepped surface and a first sub-stepped surface connected in sequence, the number of the second sub-stepped surface is greater than or equal to 1, and the number of the first sub-stepped surface is greater than or equal to 1.

[0018] In an embodiment, the height of the second sub-stepped surface is greater than or equal to 0.2 mm along the axial direction of the pole column, and / or the width of the first sub-stepped surface is greater than or equal to 0.2 mm along the radial direction of the pole column.

[0019] In an embodiment, the width of the support surface is greater than or equal to 0.3 mm and less than or equal to the average thickness of the second metal layer along the radial direction of the pole column.

[0020] In an embodiment, a matching surface is formed on the hole wall of the through hole and is adapted to the support surface.

[0021] In an embodiment, the support surface is formed on the clamping portion.

[0022] In an embodiment, the terminal pressing block is sleeved on the first metal column through the through hole.

[0023] In an embodiment, the first metal column is radially protruding to form a boss for supporting the terminal pressing block, the second metal layer extends to both upper and lower sides of the boss, and the clamping portion is clamped between the boss and the terminal pressing block.

[0024] In an embodiment, the end of the second metal layer is embedded in the first metal column.

[0025] In an embodiment, the end portion of the second metal layer is the clamping portion.

[0026] In an embodiment, the terminal block is made of the same material as the first metal column; and / or, the first metal column is an aluminum column, and the second metal layer is a copper layer; and / or, the average thickness of the second metal layer is less than or equal to 3 mm.

[0027] In an embodiment, the first metal column has opposite first and second ends, the second metal layer wraps the surface of the first end and extends to the second end, the portion of the second metal layer corresponding to the first end is used to connect with the electrode assembly, and the second end is connected with the terminal block.

[0028] In an embodiment, the clamping portion is annular, and the clamping portion is connected to the peripheral portion of the first metal column.

[0029] In a second aspect, embodiments of the present application provide a cover plate assembly, comprising: a cover plate and the conductive module as described above, the pole column is arranged in the cover plate, and the terminal block is located on one side of the cover plate.

[0030] In an embodiment, the cover plate assembly further comprises: a current collector, which is located on the side of the cover plate away from the terminal block and is welded with the pole column, the cover plate comprises: a cover plate body, a first insulating member arranged between the terminal block and the cover plate body, and a second insulating member arranged between the cover plate body and the current collector; and / or, the cover plate assembly further comprises a sealing member arranged between the cover plate and the pole column.

[0031] In a third aspect, embodiments of the present application provide a battery cell, comprising: a shell having a receiving cavity; an electrode assembly arranged in the receiving cavity, the electrode assembly comprising a tab; the cover plate assembly as described above, the cover plate assembly being connected with the shell and sealing an opening of the receiving cavity, and the pole column being connected with the tab.

[0032] The beneficial effects of embodiments of the present application are as follows:

[0033] In the embodiment of the present application, the pole column in the conductive module is arranged to include a first metal column and a second metal layer, and the pole column is connected with the terminal pressing block, part (i.e. the clamping part) of the second metal layer is clamped between the first metal column and the terminal pressing block, on the one hand, the first metal column and the terminal pressing block limit the clamping part, preventing the second metal layer from separating from the first metal column, on the other hand, since the metal has ductility, when the first metal column and the terminal pressing block clamp the clamping part, the first metal and the second metal will mutually intrude, so that the combination of the second metal layer and the first metal column is more close, and the double effects jointly reduce the risk of the second metal layer separating from the first metal column. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 is a cross-sectional structure schematic diagram of the conductive module provided by the embodiment of the present application;

[0036] Figure 2 is a cross-sectional structure schematic diagram of the pole column in Figure 1 ;

[0037] Figure 3 is an enlarged view of C part in Figure 2 ;

[0038] Figure 4 is a cross-sectional structure schematic diagram of the terminal pressing block in Figure 1 ;

[0039] Figure 5 is a cross-sectional structure schematic diagram of another pole column in the conductive module provided by the embodiment of the present application;

[0040] Figure 6 is an enlarged view of B part in Figure 2 ;

[0041] Figure 7 is a cross-sectional structure schematic diagram of another pole column in the conductive module provided by the embodiment of the present application;

[0042] Figure 8 is a cross-sectional structure schematic diagram of the pole column in Figure 7 ;

[0043] Figure 9 is a cross-sectional structure schematic diagram of another conductive module provided by the embodiment of the present application;

[0044] Figure 10is a cross-sectional structure schematic diagram of another conductive module provided by an embodiment of the present application;

[0045] Figure 11 is a cross-sectional structure schematic diagram of a cover plate assembly provided by an embodiment of the present application;

[0046] Figure 12 is an assurance diagram of a cover plate assembly provided by an embodiment of the present application;

[0047] Figure 13 is a cross-sectional diagram of a battery monomer provided by an embodiment of the present application.

[0048] Reference signs:

[0049] 10a, conductive module;

[0050] 101, pole column;

[0051] 1, first metal column; 11, first end; 12, second end; 13, boss;

[0052] 2, second metal layer;

[0053] 20, end;

[0054] 2a, clamping part;

[0055] 203, support surface;

[0056] 2031, inclined surface;

[0057] 2032, stepped surface; 20321, first sub-stepped surface; 20322, second sub-stepped surface;

[0058] 102, terminal pressing block; 1021, through hole; 1022, hole wall; 1023, matching surface;

[0059] 100, cover plate assembly;

[0060] 110, cover plate; 111, cover plate body; 112, first insulating part; 113, second insulating part; 114, mounting hole; 115, liquid injection hole;

[0061] 120, current collecting part; 1201, current collecting part body; 1202, connecting sheet;

[0062] 130, sealing part;

[0063] 140, explosion-proof valve;

[0064] 1000, battery monomer;

[0065] 1100, shell; 1110, accommodating cavity;

[0066] 1200, electrode assembly; 1210, tab. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work are within the scope of protection of the present application.

[0068] In addition, it should be understood that the specific implementations described herein are merely for the purpose of illustration and explanation and are not intended to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0069] The terms "first", "second", "third", etc. are only for descriptive purpose and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0070] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] The terms "including", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0072] In the description of the embodiments of the present application, the word "example" or "for example" is used to mean "an example of" or "for example". Any embodiment or design presented as "example" or "for example" in the embodiments of the present application is not interpreted as being more preferred than another embodiment or design. The word "example" or "for example" is intended to present a clear concept in a clear manner.

[0073] In order to facilitate the understanding of the scheme of the present application, the spline curves and arrows used in the labels in the drawings are described as follows: the components indicated by the spline curves without arrows are solid components, i.e., components with solid structures; and the components indicated by the spline curves with arrows are virtual components, i.e., components without solid structures.

[0074] Since the composite pole includes metal layers of different materials, the thermal expansion coefficients of different metals are usually different, which leads to a decrease in the bonding force between the metal layers in the composite pole under a high-temperature working environment, and the metal layers are prone to separate and fall off each other. Moreover, the bonding force between the metal layers in the composite pole is affected by the bonding area, and in the case that the diameter of the composite pole is small, the metal layers in the composite pole are also prone to fall off.

[0075] In view of the problem that the metal layers in the composite pole are prone to fall off, thereby causing the failure of the battery cell, the embodiments of the present application provide a conductive module, a cover plate assembly, and a battery cell.

[0076] In a first aspect, the embodiments of the present application provide a conductive module, which is used to connect the internal circuit of a battery cell with the circuit outside the battery cell (referred to as external circuit), so as to enable the battery cell to communicate with the external circuit, so as to realize the power supply of the external circuit to the battery cell (i.e., charging of the battery cell) or the power supply of the battery cell to the external circuit (i.e., discharging of the battery cell). In detail, the conductive module can be used to be assembled to the cover plate of the battery cell.

[0077] Specifically, referring to Figures 1 to 13 , the conductive module 10a includes a pole 101 and a terminal pressing block 102, and the terminal pressing block 102 is connected with the pole 101. The pole 101 includes a first metal column 1 and a second metal layer 2. The second metal layer 2 is combined with the surface of the first metal column 1. The second metal layer 2 includes a clamping portion 2a, and the clamping portion 2a is clamped between the first metal column 1 and the terminal pressing block 102.

[0078] The pole post 101 is a component in the battery cell 1000. The pole post 101 specifically refers to an electrically conductive structure in the battery cell 1000 for connecting with the electrode assembly 1200. As an example, the pole post 101 connects with the tab 1210 on the electrode assembly 1200. The pole post 101 can connect with the tab 1210 directly, or through other components (e.g. the current collector 120). The pole post 101 is usually partially inside the battery cell 1000, and partially outside the battery cell 1000.

[0079] The terminal block 102 is also a component in the battery cell 1000. The terminal block 102 is located outside the battery cell 1000. The terminal block 102 connects with the pole post 101, and the terminal block 102 is also used to electrically connect with external structures. As an example, the terminal block 102 connects with the module tab.

[0080] Here the terminal block 102 connects with the pole post 101, which can be that the terminal block 102 is welded with the pole post 101, or that the terminal block 102 and the pole post 101 are connected through interference fit. Of course, the terminal block 102 and the pole post 101 can also be connected in other specific ways.

[0081] The pole post 101 includes a first metal post 1 and a second metal layer 2. It can be understood that the first metal post 1 is a columnar structure, and the material of the first metal post 1 contains a first metal; the second metal layer 2 is a layered structure, and the material of the second metal layer 2 contains a second metal. Here the second metal and the first metal are different metals.

[0082] The second metal layer 2 is combined with the surface of the first metal post 1, which means that the second metal layer 2 is located on the outer surface of the first metal post 1, and the second metal layer 2 is also combined with the first metal post 1. Here the combination means that the second metal layer 2 and the first metal post 1 will not separate under the action of gravity alone. As an example, the second metal layer 2 and the first metal post 1 can be combined together through cold heading.

[0083] The second metal layer 2 includes a clamping portion 2a. Usually, part of the second metal layer 2 is formed into the clamping portion 2a to ensure that the second metal layer 2 on the pole post 101 can be connected with the electrode assembly 1200. Specifically, the clamping portion 2a is clamped between the first metal post 1 and the terminal block 102, that is, part of the second metal layer 2 is clamped between the first metal post 1 and the terminal block 102.

[0084] The conductive module 10a provided by the embodiments of the present application sets the pole 101 to include a first metal column 1 and a second metal layer 2, and the pole 101 is connected with the terminal pressing block 102, part of the second metal layer 2 (i.e. the clamping part 2a) is clamped between the first metal column 1 and the terminal pressing block 102. On the one hand, the first metal column 1 and the terminal pressing block 102 limit the clamping part 2a, preventing the second metal layer 2 from separating from the first metal column 1. On the other hand, since metal has ductility, when the first metal column 1 and the terminal pressing block 102 clamp the clamping part 2a, the first metal and the second metal will invade each other, so that the combination of the second metal layer 2 and the first metal column 1 is more closely, and the double effects jointly reduce the risk of the second metal layer 2 separating from the first metal column 1.

[0085] In some embodiments, the pole 101 is a negative pole 101, the first metal is aluminum, that is, the first metal column 1 is an aluminum column, and the second metal is copper, that is, the second metal layer 2 is a copper layer. Compared with the negative pole 101 made of pure copper, by setting the negative pole 101 to include an aluminum column and a copper layer, the cost of the negative pole 101 can be effectively reduced.

[0086] In some embodiments, the average thickness D1 of the second metal layer 2 is less than or equal to 3 mm. By making the second metal layer 2 thin, the production cost of the pole 101 can be effectively reduced. Especially in the case that the first metal column 1 is an aluminum column and the second metal layer 2 is a copper layer, the use of more expensive copper is reduced, which reduces the cost of the pole 101 and also reduces the weight of the pole 101. As an 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.

[0087] In some embodiments, the terminal pressing block 102 is made of the same material as the first metal column 1. By designing the terminal pressing block 102 and the first metal column 1 to be made of the same material, the terminal pressing block 102 and the first metal column 1 can be locally melted at the same temperature to achieve welding, and the same material can reduce the risk of the welding position of the terminal pressing block 102 and the first metal column 1 cracking due to thermal expansion. As an example, in the case that the pole 101 includes an aluminum column and a copper layer, the terminal pressing block 102 is an aluminum terminal pressing block 102, which can be welded with the aluminum column and the aluminum terminal pressing block 102, reducing the difficulty of welding and improving the reliability of welding.

[0088] In some embodiments, the pole 101 is cut along the radial direction of the pole 101, and the cross-sectional shape of the pole 101 can be one of a square, a circle, a hexagon, and a racetrack shape.

[0089] In some embodiments, please refer toFigures 1 to 10 The first metal column 1 has opposite two ends, i.e., a first end 11 and a second end 12. The second metal layer 2 wraps the surface of the first end 11, and the second metal layer 2 extends from the surface of the first end 11 to the second end 12. The part of the second metal layer 2 corresponding to the first end 11 in the pole column 101 is used to connect the tab 1210 connected with the electrode assembly 1200, and the second end 12 is connected with the terminal pressing block 102. Here, the second metal layer 2 extends from the surface of the first end 11 to the second end 12, specifically, the end 20 of the second metal layer 2 extends to the second end 12, which can be that the end 20 of the second metal layer 2 extends to the second end 12, or the end 20 of the second metal layer 2 is located between the first end 11 and the second end 12. Alternatively, the end 20 of the second metal layer 2 extends to the second end 12, but the second metal layer 2 does not completely wrap the second end 12, that is, the second end 12 is at least partially exposed outside the second metal layer 2, so as to facilitate the 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 part of the edge of the second metal layer 2. By extending the second metal layer 2 from the first end 11 to the second end 12 of the first metal column 1, compared with the form of arranging the second metal layer 2 only on the end face of one end of the first metal column 1, the bonding area of the second metal layer 2 and the first metal column 1 can be effectively increased, the risk of the second metal layer 2 falling off can be reduced, and the overcurrent capacity of the pole column 101 can be improved.

[0090] When the conductive module 10a is applied to the battery cell 1000, the first end 11 of the first metal column 1 faces the inside of the battery cell 1000, and the second end 12 faces the outside of the battery cell 1000. The second metal layer 2 wraps the first end 11 of the first metal column 1 and extends from the first end 11 to the second end 12, so that the second metal layer 2 can act as a protective layer to separate the first end 11 of the first metal column 1 from the electrolyte in the battery cell 1000, thereby reducing the risk of corrosion of the first end 11 by the electrolyte.

[0091] In some embodiments, referring to Figures 1 to 4 The terminal pressing block 102 is provided with a through hole 1021, and the terminal pressing block 102 is sleeved on the pole column 101 through the through hole 1021. That is, the pole column 101 is arranged on the terminal pressing block 102 through the through hole 1021. As an example, one end of the pole column 101 (specifically, the first end 11 of the first metal column 1) extends into the through hole 1021, and the terminal pressing block 102 is sleeved on one end of the pole column 101. By sleeving the terminal pressing block 102 on the pole column 101, the height of the conductive module 10a can be appropriately reduced, and the terminal pressing block 102 can also limit the pole column 101.

[0092] In some embodiments, the through hole 1021 is in interference fit with the pole 101. This can achieve a tight fit between the terminal block 102 and the pole 101, and improve the anti-thrust and anti-torsion capabilities of the pole 101. Meanwhile, the interference fit does not need to introduce other connecting components, and has a simple structure and high reliability.

[0093] In some embodiments, the terminal block 102 is fixed with the pole 101 by riveting. As an example, the assembly process includes inserting one end of the pole 101 into the through hole 1021 of the terminal block 102, where the pole 101 and the through hole 1021 can be in clearance fit, and then riveting the pole 101 and the through hole 1021 together by a riveting fixation process. In detail, in the riveting fixation process, the riveting machine can be used to extrude the pole 101 along the axial direction of the pole 101. During the extrusion, the pole 101 deforms, shrinks along the axial direction, and expands along the radial direction. At this time, the part of the pole 101 located in the through hole 1021 fills the gap between the pole 101 and the through hole 1021 and extrudes the hole wall 1022 of the through hole 1021, achieving the interference fit between the pole 101 and the through hole 1021, while the part of the pole 101 located outside the through hole 1021 forms a stop step that is in stop fit with the terminal block 102, i.e., the pole 101 is equivalent to a rivet, improving the reliability of the connection between the terminal block 102 and the pole 101, and reducing the risk of the pole 101 separating from the terminal block 102. Optionally, in the riveting fixation process, the terminal block 102 is fixed by a clamp, and the terminal block 102 cannot move.

[0094] In some embodiments, referring to Figures 1 to 4 , the hole wall 1022 of at least part of the through hole 1021 and the first metal column 1 are clamped by the clamping part 2a. That is, the clamping part 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 can be partially covered by the clamping part 2a, or completely covered by the clamping part 2a, i.e., the inner surface of the hole wall 1022 of the through hole 1021 and the outer surface of the first metal column 1 can be partially separated by the clamping part 2a or completely separated by the clamping part 2a. In other words, referring to Figure 1, the highest position of the clamping portion 2a is higher than the lowest position of the hole wall 1022 of the through hole 1021 in the axial direction of the pole column 101. By arranging the clamping portion 2a between the hole wall 1022 of the through hole 1021 and the first metal column 1, and when the through hole 1021 and the pole column 101 are in interference fit, the first metal in the first metal column 1 and the second metal in the clamping portion 2a can mutually intrude, so that the bonding interface between the first metal column 1 and the clamping portion 2a is deformed to form a deformed interlocking bonding interface, the area of the bonding interface is increased, and the bonding strength is improved. In addition, the clamping portion 2a can also be further deformed and extended under the clamping force of 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. In addition, when the terminal pressing block 102 is also a metal piece, and when the through hole 1021 and the pole column 101 are in interference fit, the metal in the terminal pressing block 102 can also intrude into the clamping portion 2a, thereby forming a deformed interlocking bonding interface between the hole wall 1022 of the through hole 1021 and the clamping portion 2a, and improving the bonding area and the bonding strength. Therefore, by increasing the bonding area of the second metal layer 2 and the first metal column 1 and / or the terminal pressing block 102, not only can the bonding strength of the bonding interface be improved, and the risk of the second metal layer 2 separating from the first metal column 1 be reduced, but also the overcurrent capacity of the bonding interface can be improved, and the overcurrent capacity of the conductive module 10a can be improved.

[0095] In some embodiments, referring to Figures 1 to 4 , the hole wall 1022 of part of the through hole 1021 directly contacts the first metal column 1, that is, the inner surface of the hole wall 1022 of the through hole 1021 is only partially covered by the clamping portion 2a. By retaining the direct contact between the hole wall 1022 of part of the through hole 1021 and the first metal column 1, the hole wall 1022 of the through hole 1021 and the first metal column 1 can be easily welded together. Especially when the terminal pressing block 102 and the first metal column 1 are made of the same material, the welding difficulty can be effectively reduced. As an example, the second end 12 of the first metal column 1 extends into the through hole 1021, and part of the hole wall 1022 of the through hole 1021 directly contacts part of the side surface of the second end 12, specifically, the part of the side surface of the second end 12 close to the end surface of the second end 12.

[0096] In some embodiments, the terminal pressing block 102 is sleeved on the first metal column 1 through the through hole 1021. It can be that part of the hole wall 1022 of the through hole 1021 directly contacts the first metal column 1, or all of the hole wall 1022 of the through hole 1021 directly contacts the first metal column 1, that is, there is no second metal layer 2 between the hole wall 1022 of the through hole 1021 and the first metal column 1. By sleeving the terminal pressing block 102 on the first metal column 1 through the through hole 1021, the terminal pressing block 102 and the first metal column 1 can be easily welded together, for example, by laser welding.

[0097] In some embodiments, the hole wall 1022 of the through hole 1021 is welded with the pole post 101. The welding can effectively ensure the reliability of the connection between the terminal pressing block 102 and the pole post 101. As an example, the hole wall 1022 of the through hole 1021 is welded with the first metal column 1 in the pole post 101 by laser welding. Alternatively, the hole wall 1022 of the through hole 1021 is directly welded with the first metal column 1 in the pole post 101.

[0098] In some embodiments, the hole wall 1022 of the through hole 1021 is welded with the pole post 101, and the through hole 1021 is interference fit with the pole post 101. The double connection improves the reliability of the connection.

[0099] In some embodiments, please refer 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 with the outer side surface of the second metal layer 2, and the outer surface of the second metal layer 2 includes the outer side 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 sleeved on the pole post 101 through the 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 post 101 are welded by laser welding, if there is a gap between the hole wall 1022 of the through hole 1021 and the pole post 101 before welding, the support surface 203 can be formed as the bottom surface of the gap and block the laser during welding, reducing the risk of laser penetration. Alternatively, the support surface 203 can be at least one of a stepped surface 2032, a straight surface, and a curved surface.

[0100] In some embodiments, please refer to Figures 1 to 4 , the support surface 203 is an inclined surface 2031, which gradually approaches the outer side surface of the first metal column 1 in the direction away from the first end 11 of the first metal column 1. Here, the inclined surface 2031 can be an inclined straight surface or an inclined curved surface. As an example, the inclined curved surface is an inclined circular arc surface, which can be a circular arc surface arched away from the second metal layer 2, or a circular arc surface sunken towards the second metal layer 2. By setting the support surface 203 as the inclined surface 2031, and in the direction away from the first end 11, the inclined surface 2031 gradually approaches the first metal column 1. In this way, when the terminal pressing block 102 is supported on the inclined surface 2031, the terminal pressing block 102 will generate a radial inward pressure on the inclined surface 2031 along the pole post 101, so that the part of the second metal layer 2 corresponding to the inclined surface 2031 is more closely attached to the first metal column 1, reducing the risk of the second metal layer 2 detaching.

[0101] In some embodiments, please refer to Figure 3, the inclined surface 2031 is an inclined straight surface, and an included angle a between the inclined straight surface and the outer side surface of the second metal layer 2 is 110°-130°. The included angle a in the range can make the second metal layer 2 and the first metal pillar 1 form a deformed interlocking bonding interface under the radial inward pressure applied by the terminal press block 102, thereby improving the bonding effect of the second metal layer 2 and the first metal pillar 1. As an example, the included angle a is 110°, 115°, 120°, 125°, or 130°.

[0102] In some embodiments, referring to Figures 5 to 8 , the support surface 203 is a stepped surface 2032, and the stepped surface 2032 includes a second sub-stepped surface 20322 and a first sub-stepped surface 20321 connected in sequence. Here, the first sub-stepped surface 20321 refers to a surface extending in a first direction, and the second sub-stepped surface 20322 refers to a surface extending in a second direction, wherein the first direction intersects the second direction. Optionally, the first direction is perpendicular to the second direction. As an 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. Optionally, the second sub-stepped surface 20322 and the first sub-stepped surface 20321 are both straight surfaces. The number of the second sub-stepped surface 20322 is greater than or equal to 1, and the number of the first sub-stepped surface 20321 is greater than or equal to 1, in other words, the number of the second sub-stepped surface 20322 can be one or more, and the number of the first sub-stepped surface 20321 can also be one or more. Here, multiple refers to two or more. When the number of the second sub-stepped surface 20322 is one and the number of the first sub-stepped surface 20321 is also one, the obtained stepped surface 2032 is a single-level stepped surface 2032; when the number of at least one of the second sub-stepped surface 20322 and the first sub-stepped surface 20321 is multiple, the obtained stepped surface 2032 is a multi-level stepped surface 2032. As an example, the number of the second sub-stepped surface 20322 is two, and the number of the first sub-stepped surface 20321 is also two. In the single-level stepped surface 2032, the second sub-stepped surface 20322 and the first sub-stepped surface 20321 are connected in sequence. In the multi-level stepped surface 2032, the second sub-stepped surface 20322 and the first sub-stepped surface 20321 are connected in sequence and alternately. By setting the support surface 203 as the stepped surface 2032, the stability of the cooperation between the terminal press block 102 and the pole column 101 can be improved, and the risk of laser penetration during laser welding can be reduced.

[0103] In some embodiments, referring to Figure 6In some embodiments, referring to FIG. 10, along the axial direction of the pole column 101, the height H21 of the second sub-step surface 20322 is greater than or equal to 0.2 mm. The height H21 of the second sub-step surface 20322 is not too small, otherwise the step surface 2032 is difficult to form and the step surface 2032 is easy to be damaged. As an example, the height H21 of the second sub-step surface 20322 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0104] In some embodiments, referring to FIG. 10, Figure 6 In some embodiments, referring to FIG. 10, along the radial direction of the pole column 101, the width W21 of the first sub-step surface 20321 is greater than or equal to 0.2 mm. The width W21 of the first sub-step surface 20321 is not too small, otherwise the step surface 2032 is difficult to form and the step surface 2032 is easy to be damaged. As an example, the width W21 of the first sub-step surface 20321 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0105] In some embodiments, referring to FIG. 10, Figure 3 In some embodiments, referring to FIG. 10, along the radial direction of the pole column 101, the width W2 of the support surface 203 is greater than or equal to 0.3 mm 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 subject to the average thickness D1 of the second metal layer 2, but the minimum value of the width W2 of the support surface 203 is related to the design of the support surface 203, and the minimum value is not too small, otherwise it will affect the support effect of the support surface 203 on the terminal pressing block 102, and then affect the effect of the second metal layer 2 blocking the laser during laser welding. As an 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.

[0106] In some embodiments, referring to FIG. 10, Figure 4 In some embodiments, referring to FIG. 10, the hole wall 1022 of the through hole 1021 is formed with a matching surface 1023 adapted to the support surface 203. When the support surface 203 is an inclined surface 2031, the matching surface 1023 is an inclined matching surface 1023 adapted to the inclined surface 2031. When the support surface 203 is a step surface 2032, the matching surface 1023 is a step matching surface 1023 adapted to the step surface 2032. By utilizing the complementarity between the support surface 203 and the matching surface 1023, the stability of the cooperation 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. In addition, when the support surface 203 is an inclined straight surface, the inclined straight surface is adapted to the matching surface 1023, which also plays a guiding role, further improving the reliability of the cooperation between the terminal pressing block 102 and the pole column 101.

[0107] In some embodiments, referring to Figure 1 , the supporting surface 203 is formed on the clamping portion 2a. That is, the clamping portion 2a is not only clamped between the first metal post 1 and the terminal pressing block 102, but also supports the terminal pressing block 102, which makes the structure of the pole post 101 simpler. Especially when the supporting surface is the inclined surface 2031, the partial pressure generated by the terminal pressing block 102 on the inclined surface 2031 can work together with the clamping force between the terminal pressing block 102 and the first metal post 1 to promote the formation of the deformation interlocking bonding surface between the clamping portion 2a and the first metal post 1, and reduce the risk of the second metal layer 2 peeling off.

[0108] In some embodiments, referring to Figures 1 to 8 , the end portion 20 of the second metal layer 2 is the 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 post 1. 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 deformed due to being clamped, the end portion 20 of the second metal layer 2 can continue to extend away from the body of the second metal layer 2, thereby increasing the bonding area of the second metal layer 2. In addition, since the bonding between the end portion 20 of the second metal layer 2 and the first metal post 1 is usually prone to forming a weak point, by further improving the bonding strength between the end portion 20 of the second metal layer 2 and the first metal post 1, the risk of the second metal layer 2 peeling off is reduced.

[0109] In some embodiments, the end portion 20 of the second metal layer 2 is a protruding ring, which is sleeved on the first metal post 1 and clamped between the first metal post 1 and the terminal pressing block 102.

[0110] In some embodiments, the end portion 20 of the second metal layer 2 is a protruding ring, which is sleeved on the first metal post 1 and clamped between the first metal post 1 and the terminal pressing block 102.

[0111] In some embodiments, referring to Figures 1 to 8 , the end portion 20 of the second metal layer 2 is embedded in the first metal post 1. Since the bonding between the end portion 20 of the second metal layer 2 and the first metal post 1 is usually prone to forming a weak point, by embedding the end portion 20 of the second metal layer 2 in the first metal post 1, the bonding area between the end portion 20 of the second metal layer 2 and the first metal post 1 is increased, and the bonding strength is improved. In addition, the end portion 20 of the second metal layer 2 is hidden in the first metal post 1, reducing the risk of the end portion 20 of the second metal layer 2 being scratched by external forces, thereby reducing the risk of the second metal layer 2 peeling off.

[0112] In some embodiments, referring to Figure 8 andFigure 9 The first metal post 1 is formed with a boss 13 radially protruding. Specifically, a portion of the first metal post 1 protrudes radially outwardly of the first metal post 1 to form the boss 13. As an example, the angle between the boss 13 and the radial direction of the first metal post 1 is within ±15°. The boss 13 is used to support the terminal block 102, and it is noted that the boss 13 and the terminal block 102 are not necessarily in direct contact. The second metal layer 2 extends to both the upper and lower sides of the boss 13, and can be such that the surface of the boss 13 is entirely covered by the second metal layer 2, or such that only a portion of the surface of the boss 13 is covered by the second metal layer 2. That is, the end portion 20 of the second metal layer 2 can extend beyond the boss 13, or can be located on the upper side of the boss 13. Here, the upper side of the boss 13 refers to the side surface of the boss 13 that is close to the second end 12, and the lower side of the boss 13 refers to the side surface of the boss 13 that is away from the second end 12. However, regardless of the relationship between the end portion 20 of the second metal layer 2 and the boss 13, at least the clamping portion 2a is located on the side of the boss 13 that faces the terminal block 102, and when the terminal block 102 is supported on the boss 13, the clamping portion 2a is clamped between the terminal block 102 and the boss 13 of the first metal post 1.

[0113] Here, the boss 13 can be located at the first end 11 of the first metal post 1, can be located at the second end 12 of the first metal post 1, or can be located between the first end 11 and the second end 12 of the first metal post 1. It can be understood that when the boss 13 is located at the first end 11 or the second end 12 of the first metal post 1, the first metal post 1 is cut along the axial direction of the first metal post 1, and the cross section of the first metal post 1 is in the shape of a normal T or an inverted T; when the boss 13 is located between the first end 11 and the second end 12 of the first metal post 1, the first metal post 1 is cut along the axial direction of the first metal post 1, and the cross section of the first metal post 1 is in the shape of a “middle” character.

[0114] For ease of description, the following takes the surface close to the first end 11 as the bottom surface (i.e., the lower side) and the surface away from the first end 11 as the top surface (i.e., the upper side).

[0115] As an example, please refer to Figure 10 The boss 13 is located at the second end 12 of the first metal post 1, the end portion 20 of the second metal layer 2 extends to the top surface of the boss 13, but the second metal layer 2 does not cover the end surface of the second end 12, the outer surface of the end portion 20 of the second metal layer 2 is flush with the end surface of the second end 12, and the end surface of the second end 12 is exposed to form a welding area. The terminal block 102 is supported on the boss 13, the end portion 20 of the second metal layer 2 (the end portion 20 as the clamping portion 2a) is clamped between the top surface of the boss 13 and the bottom surface of the terminal block 102, and a portion of the bottom surface of the terminal block 102 is welded to the welding area.

[0116] As an example, please refer toFigure 9 The boss 13 is located between the first end 11 and the second end 12 of the first metal column 1, the end portion 20 of the second metal layer 2 extends to the top surface of the boss 13, the terminal pressing block 102 is supported on the boss 13, the end portion 20 of the second metal layer 2 (the end portion 20 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, the terminal pressing block 102 is provided with a through hole 1021, the second end 12 of the first metal column 1 extends into the through hole 1021 and is welded with the inner wall of the through hole 1021.

[0117] As an example, the 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 and the end portion 20 of the second metal layer 2 extends to the outer side surface of the second end 12, the terminal pressing block 102 is supported on the boss 13, part of the second metal layer 2 (the part as the clamping portion 2a, for the sake of distinction, referred to 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, the terminal pressing block 102 is provided with a through hole 1021, the second end 12 of the first metal column 1 extends into the through hole 1021 and is in interference fit with the through hole 1021, and the end portion 20 of the second metal layer 2 (the end portion 20 also as the clamping portion 2a, referred to as the second clamping portion) is clamped between the inner wall of the through hole 1021 and the first metal column 1.

[0118] It can be understood that the number of clamping portions 2a can be one or more. For example, the clamping portion 2a can only include the first clamping portion, the clamping portion 2a can only include the second clamping portion, and the clamping portion 2a can include the first clamping portion and the second clamping portion.

[0119] In some embodiments, the preparation process of the conductive module 10a can include: preparing the pole 101, pre-assembling the terminal pressing block 102 with the pole 101, so that the terminal pressing block 102 is supported on the boss 13 and part of the second metal layer 2 is located between the terminal pressing block 102 and the boss 13, extruding the terminal pressing block 102 towards the boss 13, and then connecting the terminal pressing block 102 with the pole 101 together.

[0120] In some embodiments, the clamping portion 2a is arranged in a ring shape and is connected to the peripheral portion of the first metal column 1. By arranging the clamping portion 2a in a ring shape, the area of the clamping portion 2a in contact with the peripheral surface of the first metal column 1 can be increased, the bonding area of the second metal layer 2 with the first metal column 1 can be improved, the risk of the second metal layer 2 falling off can be reduced, and the manufacturing difficulty of the pole 101 can also be effectively reduced. Of course, in other embodiments, the clamping portion 2a can also be arranged to include a plurality of tabs, the plurality of tabs are distributed at intervals around the peripheral portion of the first metal column 1, and the tabs are clamped between the first metal column 1 and the terminal pressing block 102.

[0121] In the second aspect, referring to Figures 11 to 13The embodiment of the present application also provides a cover plate assembly 100 used in cooperation with a shell 1100 of a battery monomer 1000 to form a closed cavity for accommodating an electrode assembly 1200 of the battery monomer 1000.

[0122] Specifically, referring to Figure 11 and Figure 12 The cover plate assembly 100 includes a cover plate 110 and the aforementioned conductive module 10a connected with the cover plate 110. Specifically, the pole 101 in the conductive module 10a is arranged through the cover plate 110, and the terminal pressing block 102 in the conductive module 10a is located on one side of the cover plate 110.

[0123] In detail, along the thickness direction of the cover plate 110, the cover plate 110 has a first surface and a second surface opposite to each other. When the cover plate assembly 100 is installed on the shell 1100 of the battery monomer 1000, the first surface is a side surface away from the shell 1100, and the second surface is a side surface close to the shell 1100. The terminal pressing block 102 is located on the first surface of the cover plate 110. Along the thickness direction of the cover plate 110, the mounting hole 114 is arranged through the cover plate 110, and the pole 101 is arranged through the cover plate 110 through the mounting hole 114.

[0124] In some embodiments, the cover plate assembly 100 further includes a current collector 120. The current collector 120 is a conductive component in the battery monomer 1000 for connecting with the tab 1210 of the electrode assembly 1200. The current collector 120 is located on one side of the cover plate 110, specifically, the side of the cover plate 110 away from the terminal pressing block 102, that is, the current collector 120 is located on the second surface of the cover plate 110. The current collector 120 is welded with the pole 101, specifically, the current collector 120 is welded with the second metal layer 2 on the pole 101. Optionally, the material of the current collector 120 is the same as that of the second metal layer 2, that is, the material of the current collector 120 is the second metal, so as to reduce the difficulty of welding the current collector 120 with the second metal layer 2 and improve the reliability of welding.

[0125] In some embodiments, the current collector 120 includes at least one of a current collector disc and a connecting sheet.

[0126] In some embodiments, the current collector 120 includes a current collector body 1201 and a connecting sheet 1202, and the current collector body 1201 is connected with the connecting sheet 1202, wherein the current collector body 1201 is used for connecting with the tab 1210 of the electrode assembly 1200, and the connecting sheet 1202 is connected with the pole 101.

[0127] In some embodiments, the cover plate 110 comprises a cover plate body 111, a first insulating piece 112 and a second insulating piece 113, wherein the first insulating piece 112 and the second insulating piece 113 are arranged on opposite sides of the cover plate body 111 respectively. More specifically, the first insulating piece 112 is arranged between the terminal pressing block 102 and the cover plate body 111, and the second insulating piece 113 is arranged between the cover plate body 111 and the current collecting piece 120. The cover plate 110 is provided with a mounting hole 114, which penetrates the cover plate body 111, the first insulating piece 112 and the second insulating piece 113. As an example, the cover plate body 111 is an aluminum sheet, and the first insulating piece 112 and the second insulating piece 113 are plastic pieces.

[0128] In some embodiments, the cover plate assembly 100 further comprises a sealing piece 130 arranged between the cover plate 110 and the pole 101 to seal the gap between the pole 101 and the mounting hole 114 to prevent leakage of electrolyte therefrom. As an example, the sealing piece 130 is located between the cover plate body 111 and the second insulating piece 113.

[0129] In some embodiments, the assembly process of the cover plate assembly 100 comprises: sequentially aligning and stacking the second insulating piece 113, the sealing piece 130, the cover plate body 111 and the first insulating piece 112 from bottom to top, passing the pole 101 on the conductive module 10a through the mounting hole 114 from top to bottom, abutting the terminal pressing block 102 on the conductive module 10a on the first insulating piece 112, mounting the current collecting piece 120 on the side of the second insulating piece 113 away from the sealing piece 130, and welding the current collecting piece 120 and the pole 101 together by laser welding.

[0130] In some embodiments, the cover plate assembly 100 further comprises an explosion-proof valve 140 arranged on the cover plate 110.

[0131] In some embodiments, the cover plate 110 is further provided with a liquid injection hole 115 and a sealing structure (not shown) for sealing the liquid injection hole.

[0132] In a third aspect, the embodiments of the present application also provide a battery monomer 1000, also known as an electric core, which refers to a basic unit for realizing the mutual conversion between chemical energy and electrical energy.

[0133] Specifically, please refer to Figure 13The battery cell 1000 includes a housing 1100, an electrode assembly 1200, and the aforementioned cover plate assembly 100. Specifically, the housing 1100 has a receiving cavity 1110, the electrode assembly 1200 is disposed in the receiving cavity 1110, and the cover plate assembly 100 is connected with the housing 1100 and seals an opening of the receiving cavity 1110. The electrode assembly 1200 includes a tab 1210, and the post 101 is connected with the tab 1210.

[0134] Specifically, the electrode assembly 1200 further includes electrode sheets and a separator, the tab 1210 is connected with the electrode sheets, the electrode sheets include a positive electrode sheet and a negative electrode sheet, and the separator is located between the positive electrode sheet and the negative electrode sheet. It can be understood that the tab 1210 also includes a positive tab and a negative tab, wherein the positive tab is connected with the positive electrode sheet, and the negative tab is connected with the negative electrode sheet. Similarly, the post 101 also includes a positive post and a negative post, the positive tab is connected with the positive post, and the negative tab is connected with the negative post.

[0135] In addition, the battery cell 1000 further includes an electrolyte, the electrolyte is located in the receiving cavity 1110, and the electrode assembly 1200 is soaked in the electrolyte.

[0136] The above has carried out the detailed introduction to the embodiment of the application, the principle and the implementation mode of the application have been set forth by applying the specific example in this article, the above embodiment explanation is only for helping understanding the method of the application and its core thought; simultaneously, for the person skilled in the art, according to the thought of the application, in the specific implementation mode and the application range, will have the change, the above-mentioned, the content of the specification should not be understood as the limitation of the application.

Claims

1. A conductive module, characterized in that: include: A pole, the pole comprising a first metal pole and a second metal layer bonded to a surface of the first metal pole, the second metal layer comprising a clamping portion; The terminal pressing block is connected to the pole, and the clamping portion is clamped between the first metal column and the terminal pressing block.

2. The conductive module according to claim 1, wherein: The terminal pressing block is provided with a through hole, and the terminal pressing block is sleeved on the pole through the through hole.

3. The conductive module according to claim 2, characterized in that: The through hole is interference-fitted with the pole.

4. The conductive module according to claim 3, characterized in that: The terminal pressing block and the pole are fixed by riveting.

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

6. The conductive module according to claim 5, characterized in that: Part of the through hole walls is in direct contact with the first metal pillar.

7. The conductive module according to any one of claims 2 to 6, characterized in that: The hole wall of the through hole is welded to the pole.

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

9. The conductive module according to claim 8, characterized in that: The supporting 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 side surface of the first metal column from the outer side surface of the second metal layer.

10. The conductive module according to claim 9, characterized in that: The inclined surface is an inclined straight surface, and the angle between the inclined straight surface and the outer side surface of the second metal layer is 110° to 130°.

11. The conductive module according to claim 8, characterized in that: The support surface is a step surface, and the step surface includes a first sub-step surface and a second sub-step surface connected in sequence. The number of the second sub-step surfaces is greater than or equal to 1, and the number of the first sub-step surfaces is greater than or equal to 1.

12. The conductive module according to claim 11, characterized in that: Along the axial direction of the pole, the height of the second sub-step surface is greater than or equal to 0.2 mm, and / or, along the radial direction of the pole, the width of the first sub-step surface is greater than or equal to 0.2 mm.

13. The conductive module according to claim 8, characterized in that: Along the radial direction of the pole, the width of the supporting surface is greater than or equal to 0.3 mm and less than or equal to the average thickness of the second metal layer.

14. The conductive module according to claim 8, characterized in that A matching surface adapted to the supporting surface is formed on the hole wall of the through hole.

15. The conductive module according to claim 8, characterized in that: The supporting surface is formed on the clamping portion.

16. The conductive module according to any one of claims 2 to 6, characterized in that: The terminal pressing block is sleeved on the first metal column through the through hole.

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

18. The conductive module according to any one of claims 1 to 6, characterized in that: An end portion of the second metal layer is embedded in the first metal column.

19. The conductive module according to any one of claims 1 to 6, characterized in that: The end portion of the second metal layer serves as the clamping portion.

20. The conductive module according to any one of claims 1 to 6, characterized in that: The terminal pressing block is made of the same material as the first metal column; and / or the first metal column is an aluminum column, and the second metal layer is a copper layer; and / or the average thickness of the second metal layer is less than or equal to 3 mm.

21. The conductive module according to any one of claims 1 to 6, characterized in that: The first metal column has a first end and a second end opposite to each other, the second metal layer wraps the surface of the first end and extends to the second end, the portion of the second metal layer corresponding to the first end is used to connect to the electrode assembly, and the second end is connected to the terminal block.

22. The conductive module according to any one of claims 1 to 6, characterized in that: The clamping portion is configured to be annular and connected to the periphery of the first metal column.

23. A cover plate assembly, characterized in that: include: cover; The conductive module according to any one of claims 1 to 22, wherein the pole is provided on the cover plate, and the terminal pressing block is located on one side of the cover plate.

24. The cover plate assembly according to claim 23, wherein: The cover plate assembly further comprises: A current collecting member, which is located on a side of the cover plate away from the terminal pressing block and is welded to the pole, and the cover plate includes: Cover body, A first insulating member is provided between the terminal pressing block and the cover body, A second insulating member is provided between the cover body and the current collecting member; and / or, The cover plate assembly further includes a seal, which is disposed between the cover plate and the pole.

25. A battery cell, characterized in that: include: A housing having a receiving cavity; An electrode assembly is disposed in the accommodating cavity, wherein the electrode assembly includes an electrode tab; The cover plate assembly according to any one of claims 23 to 24, wherein the cover plate assembly is connected to the shell and closes the opening of the accommodating cavity, and the pole is connected to the pole ear.

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