Independent pole and cover plate assembly

Abstract

The utility model relates to the technical field of batteries, in particular to an independent pole and cover plate assembly. The independent pole comprises a connecting piece and a pole assembly, the connecting piece is provided with a pole hole, and the connecting piece is configured to be electrically connected with the cover plate body; the pole assembly comprises a pole body and a pole bottom plate, the pole body is inserted into the pole hole, and the pole body is electrically connected with the connecting piece; wherein at least part of the inner end of the pole body is made of a first conductive material, the pole bottom plate is made of a second conductive material, and the first conductive material extends to the inner side of the connecting piece and abuts against the outer end of the pole bottom plate; the second conductive material at least extends to the inner side of the connecting piece and wraps the inner side of the first conductive material; according to the independent pole provided by the utility model, the energy density of the battery cell can be improved, and the direct stress of the copper-aluminum bonding surface of the negative pole can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a kind of independent pole and cover plate assembly. BACKGROUND

[0002] The rapid development of new energy technology puts forward higher requirements to battery cell technology, especially improving the space utilization of battery cell, which is crucial to the improvement of battery cell energy density.

[0003] In the prior art, the battery cover plate is generally designed as an integral type, and the cover plate of the integral type often has a large redundant space around the pole assembly to ensure the convenience of installation and maintenance, thereby causing the overall height of the pole assembly to be high, which affects the energy density of the battery cell. At the same time, the negative pole is affected by the processing technology and the form of copper-aluminum combination interface, and the copper-aluminum combination surface directly under stress has a separation risk, high cost and low production efficiency. Therefore, how to improve the energy sealing of the battery cell and reduce the direct stress on the copper-aluminum combination surface of the negative pole is a technical problem to be solved in this case. SUMMARY

[0004] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide an independent pole and cover plate assembly capable of improving the energy density of the battery cell and reducing the direct stress on the copper-aluminum combination surface of the negative pole.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides an independent pole, which comprises:

[0006] A connecting piece is provided with a pole hole, and the connecting piece is configured to be electrically connected with the cover plate body;

[0007] A pole assembly comprises a pole body and a pole bottom plate, the pole body is inserted into the pole hole, and the pole body is electrically connected with the connecting piece;

[0008] The inner end of the pole body is at least partially made of a first conductive material, the pole bottom plate is made of a second conductive material, the first conductive material extends to the inner side of the connecting piece and abuts against the outer end of the pole bottom plate; and the second conductive material extends at least to the inner side of the connecting piece and wraps the inner side of the first conductive material.

[0009] In an embodiment of the utility model, the connecting piece and the pole assembly are insulated by the insulating component provided therebetween.

[0010] The insulating component at least partially covers the side wall of the pole hole and the area near the edge of the pole hole on the inner and outer sides of the connecting piece, and the insulating component comprises an insulating ring and / or a sealing ring.

[0011] In an embodiment of the utility model, the outer end of the pole post bottom plate is provided with a first fitting part; the inner end of the pole post body is provided with a second fitting part, and the first fitting part and the second fitting part are adaptively fitted.

[0012] In an embodiment of the utility model, the first fitting part and the second fitting part are fitted and extended to the inner side of the connecting piece and abut against the inner end of the insulating part.

[0013] The outer end surface of the region where the first fitting part and the second fitting part abut against the inner end of the insulating part is a plane.

[0014] In an embodiment of the utility model, the interface transition corners where the first fitting part and the second fitting part are fitted are all transitioned through arc corners.

[0015] In an embodiment of the utility model, the sealing ring at least covers the region between the connecting piece and the pole post bottom plate, so that the inner side space of the connecting piece and the first conductive material are isolated by the second conductive material and the sealing ring.

[0016] In an embodiment of the utility model, the connecting piece comprises a stepped structure for mutually clamping with the cover plate body, and the connecting piece is welded and connected with the cover plate body through the stepped structure.

[0017] To achieve the above object and other related objects, the utility model provides a cover plate assembly comprising the independent pole post and the cover plate body.

[0018] The cover plate body is provided with a mounting hole, and the edge of the mounting hole is welded and connected with the connecting piece of the independent pole post.

[0019] In an embodiment of the utility model, the cover plate body comprises an integrally formed first plate body, two second plate bodies and a transition part connecting the first plate body and the second plate bodies.

[0020] The two second plate bodies are spaced apart and are both arranged closer to the outer side relative to the first plate body, and the mounting hole is arranged on each second plate body.

[0021] In an embodiment of the utility model, the independent pole post comprises two, one of which is a positive pole post assembly, and the other is a negative pole post assembly; the pole post bottom plate of the negative pole post assembly is made of a second conductive material.

[0022] In summary, the utility model discloses a battery cover plate is designed as the cover plate body and connecting piece of independent forming, and the independent type pole is formed through connecting piece and pole assembly assembly, and this design reduces the redundant space significantly, improves the space utilization of battery interior, can accommodate more or larger capacity electric core to improve the volume energy density of battery. Meanwhile, the independent type pole is directly connected with the cover plate body through connecting piece, simplifies the assembly process, avoids the process step that the integral type battery cover plate is directly connected with the pole assembly and hinders the welding connection of the inner end of pole and other components (such as pole lug). In addition, the inner end first conductive material of pole body of negative pole and the second conductive material of pole bottom plate all extend to the inner side of connecting piece, and the inner end of pole body is limited through pole bottom plate, thereby avoiding the bonding surface between different metals directly stressed, reducing the separation risk of copper-aluminum bonding surface, reducing the scrap rate of pole assembly production, thereby reducing the production cost of independent type pole, and improving production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0024] Figure 1 It is the three-dimensional structure schematic diagram of independent type pole in an embodiment of the utility model;

[0025] Figure 2 It is the three-dimensional structure schematic diagram of cover plate assembly in an embodiment of the utility model;

[0026] Figure 3 It is Figure 2 A-A structure sectional view in it, and this is the place of negative independent type pole;

[0027] Figure 4 It is Figure 2 B-B structure sectional view in it, and this is the place of positive independent type pole;

[0028] Figure 5 It is the pole body structure schematic diagram in an embodiment of the utility model;

[0029] Figure 6 It is the pole bottom plate structure schematic diagram in an embodiment of the utility model;

[0030] Figure 7 It is the whole structure schematic diagram of pole assembly in an embodiment of the utility model;

[0031] Figure 8 is a schematic view of the connecting piece structure in an embodiment of the present application;

[0032] Figure 9 is a schematic view of the cover plate body three-dimensional structure in an embodiment of the present application;

[0033] Figure 10 is a schematic view of the secondary battery structure in an embodiment of the present application;

[0034] Element number explanation: battery cell 100, tab 101, cover plate body 11, first plate body 111, second plate body 112, mounting hole 1121, transition part 113, connecting piece 12, annular body 121, pole post hole 1211, step structure 122, first protruding part 1221, second protruding part 1222, pole post assembly 2, pole post body 21, second fitting part 211, pole post bottom plate 22, first fitting part 221, insulation part 3, insulation ring 31, sealing ring 32, insulation plate 4. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and functions of the present application from the content disclosed in the specification. The present application can also be implemented or applied in other different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are for describing specific specific embodiments, not for limiting the protection scope of the present application. The test methods not specified in the following embodiments are usually performed under conventional conditions or under the conditions recommended by the manufacturers.

[0036] Please refer to Figures 1 to 10 It should be noted that the structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and are not used to limit the limiting conditions that can be implemented by the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the functions and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, not for limiting the scope of the present application, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0037] When the embodiments give a numerical range, it should be understood that, unless otherwise stated by the utility model, both ends of each numerical range and any number between the two ends can be selected. Unless otherwise defined, all technical and scientific terms used in the utility model are used in the same meaning as the skilled in the art of the present technology and the description of the utility model, and any method, equipment and material of the prior art similar or equivalent to the method, equipment and material described in the embodiments of the utility model can be used to realize the utility model.

[0038] In the description of the utility model, the "inner" and "outer" are based on the cavity of the battery, that is, the side or end close to the battery cavity is the inner side or end, and the side or end away from the battery cavity is the outer side or end. As shown, the cover plate assembly in the X direction is close to the outer side direction. The thickness direction described below is the X direction, wherein the Y direction is perpendicular to the thickness direction. Figure 3

[0039] The secondary battery is also called a rechargeable battery or an energy storage battery, which refers to a battery that can be charged by external electric energy and release electric energy when needed. The secondary battery includes a shell, a battery cell 100 and a cover plate assembly, the battery cell 100 is received in the shell, and the cover plate assembly is connected with the shell to enclose the battery cell 100 in the shell. The cover plate assembly is generally provided with a pole assembly 2, the inner end of the pole assembly 2 is connected with the tab 101 of the battery cell 100, and the outer end of the pole assembly 2 is exposed outside the battery cover plate for connecting the bus bar.

[0040] In the prior art, the battery cover plate is generally designed as a whole, and the battery cover plate of the whole design often has a larger redundant space around the pole assembly 2 to ensure the convenience of installation and maintenance, thereby causing the overall height of the pole assembly 2 to be higher, which affects the energy density of the battery cell 100. At the same time, since the materials of the positive and negative tabs of the battery cell 100 are generally different, for example, the positive tab is generally made of aluminum, and the negative tab is generally made of copper, and the copper and aluminum cannot be welded, therefore, the inner end of the negative pole assembly 2 needs to be made of the same material as the tab 101 of the negative pole, for example, a layer of copper material is arranged at the inner end of the negative pole assembly 2, so that the inner end of the negative pole has a copper-aluminum combined interface, and the copper-aluminum combined interface directly under stress will have a separation risk, high cost and low production efficiency.

[0041] Therefore, as shown, the utility model provides an independent pole, which comprises a connecting piece 12 and a pole assembly 2; the connecting piece 12 is provided with a pole hole 1211, and the connecting piece 12 is configured to be electrically connected with the cover plate body 11; Figures 1-3

[0042] ​​The pole post assembly 2 comprises a pole post body 21 and a pole post bottom plate 22, the pole post body 21 is inserted into the pole post hole 1211, and the pole post body 21 is electrically connected with the connecting piece 12;

[0043] The inner end of the pole post body 21 is at least partially made of a first conductive material, the pole post bottom plate 22 is made of a second conductive material, the first conductive material extends to the inner side of the connecting piece 12 and abuts against the outer end of the pole post bottom plate 22; and the second conductive material at least extends to the inner side of the connecting piece 12 and wraps the inner side of the first conductive material.

[0044] It should be noted that in the present case, the battery cover plate is designed as a cover plate body 11 and a connecting piece 12, the cover plate body 11 and the connecting piece 12 are independently formed, and the cover plate body 11 and the connecting piece 12 are connected by welding, fasteners or other connection methods that meet the use requirements. In the present case, the connecting piece 12 is first installed with the pole post assembly 2 and the insulating part 3 to form an independent pole post, and then the connecting piece 12 is welded with the cover plate body 11 at a later step. The battery cover plate is used to cooperate with the shell (not shown in the figure) to form a cavity for accommodating the battery cell 100, the pole post assembly 2 is electrically connected with the tab 101 of the battery cell 100, and is used to guide the input and output end of the battery cell 100 to the outside of the shell. In the Y direction perpendicular to the thickness direction, the cross section of the connecting piece 12 is a circular ring, an elliptical ring, an approximate elliptical ring or a square ring, and can also be a combination of multiple structures. In specific embodiments, the cover plate body 11 and the connecting piece 12 can be made of metal materials, for example, they can be aluminum plates. In specific embodiments, the insulating part 3 is made of insulating materials, such as plastic or rubber. The pole post assembly 2 can be connected by several parts or independently formed by a metal material, such as aluminum or copper.

[0045] The utility model discloses, one aspect through the battery cover plate is designed as the cover plate body 11 and connecting piece 12 of independent forming, connecting piece 12, pole post assembly 2, insulating part 3 can assemble and form the independent pole post, then welding connection of connecting piece 12 and cover plate body 11 in subsequent procedure, thereby greatly reduce the unnecessary redundancy space, make the whole cover plate assembly structure more compact. Because the space in the battery has been more effectively utilized, this means that under the same external size, more battery cells 100 or larger capacity battery cells 100 can be accommodated, thereby improving the volumetric energy density of the battery. For example, the battery cover plate is divided into two parts, the cover plate body 11 and the connecting piece 12, and the design of these two parts can be optimized respectively. The connecting piece 12 is used for connecting the pole post assembly 2 and other components, and the cover plate body 11 mainly provides overall structural support. This separation design allows each part to be optimized according to its specific function, thereby reducing unnecessary space waste. At the same time, the independent pole post is directly electrically connected to the cover plate body 11 through the connecting piece 12, which simplifies the assembly process and avoids the process step of hindering the welding connection between the inner end of the pole post assembly 2 and other components such as the tab 101 after the direct connection of the overall battery cover plate and the pole post assembly 2. On the other hand, the first conductive material of the inner end of the pole post body 21 of the negative pole post and the second conductive material of the pole post bottom plate 22 both extend to the inner side of the connecting piece 12, and the inner end of the pole post body 21 is limited by the pole post bottom plate 22, thereby avoiding direct stress on the bonding surface between different metals and improving the reliability of the pole post body 21. Generally, the composite of the inner end of the pole post body 21 of the negative pole post and the pole post bottom plate 22 is formed by stamping and machining, and the copper-aluminum bonding surface extends to the inner side of the connecting piece 12, thereby avoiding direct stress on the copper-aluminum bonding surface, avoiding or reducing the separation of the copper-aluminum bonding surface, reducing damage costs, and improving the production efficiency of the pole post assembly 2.

[0046] Regarding the assembly process of the cover plate assembly: the processing technology of the existing integrated battery cover plate is riveting first and then welding. In this application, the tab 101 needs to be welded to the pole post bottom plate 22, so if the battery cover plate is riveted first, it will block the welding position of the tab 101. Therefore, in this application, the connecting piece 12, the pole post assembly 2, and the insulating part 3 are assembled into an independent pole post first, then the tab 101 is welded, and the battery is folded to combine the core. In the subsequent assembly process, the independent pole post is inserted through the mounting hole 1121 of the cover plate body 11, the pole post bottom plate 22 is located on the inner side of the cover plate body 11, the independent pole post is assembled with the cover plate body 11, the connecting piece 12 is welded to the cover plate body 11 to form a complete battery cover plate, and finally the battery cover plate is welded to the battery shell.

[0047] For example, Figure 3As shown in FIG. 10, as an optional embodiment of the present application, the insulation component 3 is arranged between the connecting piece 12 and the pole assembly 2 to insulate them.

[0048] The insulation component 3 at least partially covers the side wall of the pole hole 1211 and the area near the edge of the pole hole 1211 on the inner and outer sides of the connecting piece 12. The insulation component 3 includes an insulation ring 31 and / or a sealing ring 32.

[0049] It should be noted that the cross section of the insulation ring 31 and / or the sealing ring 32 in the Y direction perpendicular to the thickness direction can also be a circular ring, an elliptical ring, an approximate elliptical ring or a square ring, which can be designed according to actual needs. Of course, the insulation component 3 can also be selected as a whole design or a split design according to actual needs. The insulation ring 31 is generally made of plastic material, and the sealing ring 32 is generally made of elastic rubber material. The insulation component 3 insulates the connecting piece 12 and the pole assembly 2, which can be insulated by the insulation ring 31 and the sealing ring 32. The insulation component 3 arranged between the pole assembly 2 and the connecting piece 12 effectively isolates the current and prevents safety hazards such as short circuit. This design ensures the safety of the battery during operation and improves the reliability of the overall battery system.

[0050] As an optional embodiment of the present application, as shown in FIG. 10, the insulation component 3 includes the insulation ring 31 and the sealing ring 32. Figure 3 The sealing ring 32 at least covers the area between the connecting piece 12 and the pole bottom plate 22, so that the inner space of the connecting piece 12 and the first conductive material are insulated by the second conductive material and the sealing ring 32. This can avoid the corrosion of the primary battery when the two different conductive materials are in contact with the electrolyte at the same time.

[0051] As an optional embodiment of the present application, as shown in FIG. 10, the sealing ring 32 can cover the area near the pole hole 1211 on the inner side of the connecting piece 12. The sealing ring 32 can abut against the inner end of the connecting piece 12 and the insulation ring 31. Figure 3 As an optional embodiment of the present application, as shown in FIG. 10, the insulation component 3 includes the insulation ring 31. The insulation ring 31 at least covers the side wall of the pole hole 1211 and the area near the edge of the pole hole 1211 on the outer side of the connecting piece 12. The connecting piece 12 abuts against the inner end of the insulation ring 31, thereby improving the insulation between the connecting piece 12 and the pole assembly 2, which is conducive to improving the safety and reliability of the battery system.

[0052] Figure 3 As an optional embodiment of the present application, as shown in FIG. 10, the insulation component 3 includes the insulation ring 31. The insulation ring 31 at least covers the side wall of the pole hole 1211 and the area near the edge of the pole hole 1211 on the outer side of the connecting piece 12. The connecting piece 12 abuts against the inner end of the insulation ring 31, thereby improving the insulation between the connecting piece 12 and the pole assembly 2, which is conducive to improving the safety and reliability of the battery system.

[0053] As an optional embodiment of the present application, as shown in FIG. 10, the insulation component 3 includes the insulation ring 31. The insulation ring 31 at least covers the side wall of the pole hole 1211 and the area near the edge of the pole hole 1211 on the outer side of the connecting piece 12. The connecting piece 12 abuts against the inner end of the insulation ring 31, thereby improving the insulation between the connecting piece 12 and the pole assembly 2, which is conducive to improving the safety and reliability of the battery system. Figure 3 5 ​​As shown in FIG. 7, the outer end of the pole column bottom plate 22 is provided with a first fitting part 221; the inner end of the pole column body 21 is provided with a second fitting part 211, and the first fitting part 221 and the second fitting part 211 are adaptively fitted.

[0054] It should be noted that through the adaptive fitting of the first fitting part 221 and the second fitting part 211, the close combination between the two different materials of copper and aluminum can be ensured, thereby improving the stability and reliability of the connection, effectively preventing poor contact caused by looseness or displacement, and solving the problem of affecting the electrical performance. Generally, the inner end of the pole column body 21 is made of aluminum material, and the pole column bottom plate 22 is made of copper material. The design of the copper-aluminum transition makes the lower part of the pole column assembly 2 in contact with the electrolyte be made of copper material, and the upper part be made of aluminum material. The copper material has good electrical conductivity and will not cause electrochemical corrosion; the aluminum material has good welding performance and is more conducive to welding with other components such as the busbar, thereby ensuring the electrical conductivity and avoiding the problem of electrochemical corrosion. At the same time, compared with the all-copper piece, the cost of the copper-aluminum composite negative pole column is lower, which helps to reduce the cost of parts and improve economic efficiency.

[0055] As an optional embodiment of the present case, as shown in Figure 3 、 5 As shown in FIG. 7, the first fitting part 221 and the second fitting part 211 are fitted and extended to the inner side of the connecting piece 12 and abut against the inner end of the insulating part 3.

[0056] The outer end surface of the area where the first fitting part 221 and the second fitting part 211 abut against the inner end of the insulating part 3 is a plane, as shown in Figure 7 The P position shown in FIG. 7 is a plane.

[0057] It should be noted that the connecting piece 12 is part of the battery cover plate, and its sealing performance is crucial to the safety of the battery; the first fitting part 221 and the second fitting part 211 are fitted and extended to the inner side of the connecting piece 12 and abut against the inner end of the insulating part 3, which helps to improve the sealing performance of the entire structure, prevents the leakage of chemical substances inside the battery, avoids the influence of the external environment on the battery, thereby protecting the battery core and prolonging the service life of the battery; and the design of the outer end surface as a plane helps to reduce the resistance of the electrical contact surface and improve the efficiency of current conduction, and also helps to evenly distribute the stress at the copper-aluminum combination surface, thereby reducing or preventing the separation of the copper-aluminum combination surface and reducing the damage cost.

[0058] As an optional embodiment of the present case, as shown in Figure 3 、 5 As shown in FIG. 7, the combination surface at the corner where the first fitting part 221 and the second fitting part 211 are fitted is transitioned through an arc-shaped corner.

[0059] It should be noted that the arc-shaped corner transition can effectively reduce stress concentration, so that the fitting part can more evenly disperse the pressure when subjected to external force, thereby improving the stability and durability of the overall structure, reducing the risk of fracture or damage caused by stress concentration, and further optimizing the stress problem of the copper-aluminum bonding surface.

[0060] As an optional embodiment of the present application, as shown in Figure 3 and 8 The connecting piece 12 includes a stepped structure 122 for mutual clamping with the cover plate body 11, and the connecting piece 12 is welded to the cover plate body 11 through the stepped structure 122.

[0061] It should be noted that the specific shape of the stepped structure 122 can be designed according to actual use requirements and convenience, so as to facilitate the subsequent welding connection of the cover plate body 11 and the connecting piece 12, thereby improving the connection convenience and structural stability. At the same time, the stepped structure 122 can form positioning in the thickness direction and the horizontal direction. Due to the existence of the stepped structure 122, the accurate positioning of the connecting piece 12 and the cover plate body 11 can be ensured before welding, thereby avoiding the use of additional positioning auxiliary tools, which not only saves time and manpower, but also reduces the operation complexity. The self-positioning stepped structure 122 can accurately maintain the alignment of the connecting piece 12 and the cover plate body 11, ensuring the accuracy of the welding joint position, which is crucial for ensuring the quality of the welding seam and the safety of the battery, and reducing the welding defects caused by misalignment.

[0062] As an optional embodiment of the present application, as shown in Figure 3 and 8 The connecting piece 12 includes an annular body 121 riveted to the pole assembly 2; the outer end of the annular body 121 protrudes and is provided with a first protrusion 1221, a second protrusion 1222 extends in the radial direction between the annular body 121 and the first protrusion 1221, the second protrusion 1222 is located on the side of the connecting piece 12 away from the pole assembly 2, and the second protrusion 1222 intersects with the first protrusion 1221 to form the stepped structure 122.

[0063] It should be noted that the annular stepped structure 122 can increase the contact area between the cover plate body 11 and the connecting piece 12, thereby improving the stability and strength of the welding connection, and enabling the battery cover plate to more evenly disperse stress when subjected to external pressure, effectively preventing structural damage caused by excessive local stress. At the same time, the annular stepped design also helps to improve the overall rigidity of the battery cover plate, reduce deformation, and protect the integrity and safety of the internal structure of the battery.

[0064] The present application also provides a cover plate assembly, as shown in Figure 2 and9 As shown, the independent pole post and the cover plate body 11 are included;

[0065] The cover plate body 11 is provided with a mounting hole 1121, and the edge of the mounting hole 1121 is welded to the connecting piece 12 of the independent pole post. It should be understood that the edge of the mounting hole 1121 is matched with the stepped structure 122, and the outermost end surface of the cover plate body 11 can be flush with the outermost end surface of the connecting piece 12.

[0066] As an optional embodiment of the present case, as shown in Figure 9 As shown, the cover plate body 11 includes an integrally formed first plate body 111, two second plate bodies 112, and a transition part 113 connecting the first plate body 111 and the second plate body 112;

[0067] The two second plate bodies 112 are spaced apart and are both arranged closer to the outside relative to the first plate body 111, and the mounting hole 1121 is arranged in each second plate body 112.

[0068] It should be noted that, since the pole post bottom plate 22 and the cover plate body 11 are provided with an insulating plate 4, the insulating plate 4 has a receiving cavity for accommodating the tab 101 between the pole post bottom plate 22, the pole post bottom plate 22 has a welding surface for welding the tab 101, and the welding surface constitutes one side cavity wall of the receiving cavity. Therefore, by arranging the second plate body 112 to be arranged closer to the outside relative to the first plate body 111, more space is left for the receiving cavity, so that the tab 101 does not protrude towards the cover plate body 11 after welding, thereby avoiding the difficulty of subsequent installation of the cover plate body 11, the insulating plate 4, etc., thereby facilitating the smooth progress of the assembly process.

[0069] As an optional embodiment of the present case, as shown in Figure 2 As shown, the independent pole post is provided with two, one of which is a positive pole post assembly, and the other is a negative pole post assembly; the pole post bottom plate 22 of the negative pole post assembly is made of a second conductive material. The pole post body 21 and the pole post bottom plate 22 of the positive pole post assembly are generally integrally arranged. Since the materials of the positive and negative tabs of the battery cell 100 are generally different, for example, the positive tab is generally made of aluminum, and the negative tab is generally made of copper, and copper and aluminum cannot be welded together. Therefore, the pole post bottom plate 22 of the negative pole post assembly needs to be made of the same material as the negative tab 101 to facilitate welding.

[0070] As an optional embodiment of the present case, the first conductive material is aluminum, and the second conductive material is copper.

[0071] As shown in Figure 10The utility model provides a secondary battery, including the cover plate subassembly, and the electric core 100 and shell, the shell with cover plate subassembly connects to form the cavity for accomodating electric core 100, electric core 100 is accomodated in the cavity, and the tab 101 of electric core 100 is connected with the pole column bottom plate 22 electricity.

[0072] In summary, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

[0073] The above-mentioned embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A stand-alone pole, characterized by, The application relates to a connection piece and a pole assembly. The connection piece is provided with a pole hole, and is configured to be electrically connected with a cover plate body. The pole assembly comprises a pole body and a pole bottom plate, and the pole body is inserted into the pole hole and is electrically connected with the connection piece. The inner end of the pole body is at least partially made of a first conductive material, the pole bottom plate is made of a second conductive material, the first conductive material extends to the inner side of the connection piece and abuts against the outer end of the pole bottom plate, and the second conductive material at least extends to the inner side of the connection piece and wraps the inner side of the first conductive material.

2. The stand-alone pole as claimed in claim 1, characterized in that The connection piece and the pole assembly are insulated by an insulation component. The insulation component at least partially covers the side wall of the pole hole and the area close to the edge of the pole hole on the inner and outer sides of the connection piece, and the insulation component comprises an insulation ring and / or a sealing ring.

3. The self-contained pole according to claim 2, wherein, The outer end of the pole bottom plate is provided with a first fitting part, and the inner end of the pole body is provided with a second fitting part, and the first fitting part and the second fitting part are adaptively fitted.

4. The self-contained pole according to claim 3, wherein, The first fitting part and the second fitting part are extended to the inner side of the connection piece and abut against the inner end of the insulation component. The outer end surface of the area, where the first fitting part and the second fitting part abut against the inner end of the insulation component, is a plane.

5. The self-contained pole according to claim 3, wherein, The transition corners of the division surface of the first fitting part and the second fitting part are all arc-shaped.

6. The self-contained pole of claim 2, wherein, The sealing ring at least covers the area between the connection piece and the pole bottom plate, so that the inner side space of the connection piece and the first conductive material are isolated by the second conductive material and the sealing ring.

7. The self-contained pole of claim 1, wherein, The connection piece comprises a stepped structure for being clamped with the cover plate body, and the connection piece is welded with the cover plate body through the stepped structure.

8. A cover plate assembly characterized by, The application relates to an independent pole and a cover plate body. The cover plate body is provided with a mounting hole, and the edge of the mounting hole is welded with the connection piece of the independent pole.

9. The cover plate assembly of claim 8, wherein, The cover plate body comprises an integrally-formed first plate body, two second plate bodies and a transition part connecting the first plate body and the second plate bodies. The two second plate bodies are arranged at intervals and are arranged closer to the outer side relative to the first plate body, and the mounting hole is arranged on each second plate body.

10. The cover plate assembly of claim 8, wherein, The independent pole is provided with two poles, one of which is a positive pole assembly, and the other of which is a negative pole assembly; the pole bottom plate of the negative pole assembly is made of a second conductive material.

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