Independent pole, cover plate assembly and secondary battery

Abstract

The utility model relates to the technical field of batteries, in particular to an independent pole, a cover plate assembly and a secondary battery. The independent pole comprises a connecting piece, a pole assembly and an insulating layer; a pole hole is formed in the connecting piece, and the connecting piece is configured to be electrically connected with the cover plate body; the pole assembly is inserted into the pole hole, and the pole assembly is electrically connected with the connecting piece; an insulating layer is arranged between the pole assembly and the connecting piece; according to the independent pole provided by the utility model, unnecessary redundant space between the pole assembly and the battery cover plate can be reduced, so that more battery cells or battery cells with larger capacity can be accommodated under the condition that the external size is not increased, and the volume energy density of the battery is further improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an independent electrode post, cover plate assembly, and secondary battery. Background Technology

[0002] The rapid development of new energy technologies has placed higher demands on battery cell technology, especially improving the space utilization rate of battery cells, which is crucial for increasing cell energy density. In existing technical solutions, the battery cover is generally a one-piece design. This one-piece design often leaves a large amount of redundant space around the terminal assembly to ensure the convenience of installation and maintenance, resulting in a relatively high overall height of the terminal assembly, which affects the energy density of the battery cell. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an independent terminal post and cover plate assembly and secondary battery that can reduce unnecessary redundant space between the terminal post assembly and the cover plate, thereby improving the battery energy density.

[0004] To achieve the above and other related objectives, this utility model provides an independent pole, comprising:

[0005] A connector having a pole hole and configured to be electrically connected to the cover plate body;

[0006] The electrode assembly is inserted into the electrode hole, and the electrode assembly is electrically connected to the connector;

[0007] An insulating layer is provided between the pole assembly and the connector.

[0008] In one embodiment of the present invention, the connector includes a stepped structure for interlocking with the cover plate body, and the connector is welded to the cover plate body through the stepped structure.

[0009] In one embodiment of the present invention, the connector includes an annular body riveted to the pole post assembly; the outer end of the annular body is provided with a first protrusion, and a second protrusion extends radially between the annular body and the first protrusion, the second protrusion being located on the side of the connector away from the pole post assembly and intersecting with the first protrusion to form the stepped structure.

[0010] In one embodiment of this utility model, the thickness of the second protrusion is 0.5 mm to 1.0 mm, the depth of the annular step structure in the thickness direction is 0.3 mm to 0.8 mm, and the width of the annular step structure in the protruding direction of the second protrusion is 0.3 mm to 1.0 mm.

[0011] In one embodiment of this utility model, the distance between the first protrusion and the insulating layer is 2 mm to 4 mm, and / or the maximum distance between the first protrusion and the annular body in the thickness direction is 1 mm.

[0012] In one embodiment of this utility model, the pole assembly includes a pole body and a limiting piece;

[0013] The limiting piece is made of a first material. The limiting piece is engaged with the electrode body in the thickness direction of the electrode body. The part of the electrode body that is engaged with the limiting piece is made of a first conductive material. The hardness of the first material is greater than that of the first conductive material. The limiting piece abuts against the outer end of the insulating layer.

[0014] In one embodiment of the present invention, the insulating layer includes an insulating ring and a sealing ring. The insulating ring covers at least the sidewall of the pole hole and the area on the outside of the connector near the edge of the pole hole. The connector abuts against the inner end of the insulating ring. The sealing ring covers at least a portion of the inner side of the connector.

[0015] To achieve the above and other related objectives, this utility model provides a cover plate assembly, including the aforementioned independent pole and cover plate body;

[0016] The cover plate body is provided with mounting holes, and the edge of the mounting holes is welded to the connector of the independent pole.

[0017] In one embodiment of the present invention, the cover plate body includes an integrally formed first plate, two second plates, and a transition portion connecting the first plate and the second plates;

[0018] The two second plates are spaced apart and are both positioned closer to the outer side relative to the first plate, and the mounting holes are located on the two second plates.

[0019] In one embodiment of the present invention, the outer end of the connector is flush with the outer end face of the cover plate body, and the outer end face of the pole assembly is positioned closer to the outer side relative to the outer end face of the connector.

[0020] In one embodiment of the present invention, an insulating plate is further provided on the inner side of the cover plate body, and the inner end of the pole assembly includes a pole base plate. The pole base plate extends to the inner side of the insulating plate and is spaced apart from the insulating plate. A clamping cavity for accommodating the pole tab is formed between the pole base plate and the insulating plate.

[0021] To achieve the above and other related objectives, this utility model provides a secondary battery, including the aforementioned cover plate assembly, a battery cell, and a housing. The housing is connected to the cover plate assembly to form a cavity for housing the battery cell, which is housed within the cavity, and the battery cell's tabs are electrically connected to the terminal body.

[0022] In summary, this utility model designs the battery cover as a separately formed cover body and connector. The connector, terminal assembly, and insulating layer can be assembled to form an independent terminal, reducing unnecessary redundant space generated when the terminal assembly is directly connected to the integral battery cover. This allows for the inclusion of more or larger capacity cells without increasing the external dimensions, thereby improving the volumetric energy density of the battery. At the same time, the independent terminal is directly electrically connected to the cover body through the connector, simplifying the assembly process and preventing the integral battery cover from directly connecting to the terminal assembly and hindering the welding connection of the inner end of the terminal assembly to other components such as the tabs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the independent pole column in one embodiment of the present invention;

[0025] Figure 2 This is a three-dimensional structural diagram of the cover plate assembly in one embodiment of the present utility model;

[0026] Figure 3 for Figure 2 Sectional view of the AA structure in the image;

[0027] Figure 4 for Figure 2 BB structure sectional view in the middle;

[0028] Figure 5 This is a schematic diagram of the connector structure in one embodiment of the present utility model;

[0029] Figure 6 This is a dimension annotation diagram of the connector in one embodiment of the present invention;

[0030] Figure 7 This is a dimensional annotation diagram showing the relationship between the connector and the pole assembly in one embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the limiting piece structure in one embodiment of the present invention;

[0032] Figure 9 This is a three-dimensional structural diagram of the cover plate body in one embodiment of the present utility model;

[0033] Figure 10 This is a cross-sectional view of the cover plate body structure in one embodiment of the present utility model;

[0034] Figure 11 This is a cross-sectional view of a secondary battery structure in one embodiment of the present invention;

[0035] Component labeling description: Cover plate body 11, First plate 111, Second plate 112, Mounting hole 1121, Transition part 113, Connector 12, Annular body 121, Pole post hole 1211, Step structure 122, First protrusion 1221, Second protrusion 1222, First outer end face 1223, Pole post assembly 2, Pole post body 211, Pole post base plate 212, Limiting piece 22, Insulating layer 3, Insulating ring 31, Sealing ring 32, Insulating plate 5, Battery cell 100, Electrode ear 101, Clamping cavity 102. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0037] Please see Figures 1 to 11It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0038] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0039] In the description of this utility model, the terms "inner" and "outer" are based on the battery cavity; that is, the side or end closer to the battery cavity is the inner side or inner end, and the side or end farther from the battery cavity is the outer side or outer end. For example... Figure 2 As shown, the area above the cover plate assembly along the X direction is closer to the outer side. The thickness direction described below in this case is the X direction.

[0040] A secondary battery, also known as a rechargeable battery or energy storage battery, is a battery that can be charged by an external electrical source and release electrical energy when needed. A secondary battery includes a casing, a battery cell 100, and a battery cover. The battery cell 100 is housed within the casing, and the cover is connected to the casing to enclose the battery cell 100 within the casing. The battery cover typically has terminals; the inner end of the terminal connects to the tab 101 of the battery cell 100, while the outer end of the terminal protrudes from the outside of the cover for connecting to a busbar.

[0041] In existing technologies, battery covers are generally designed as a single unit. This design often leaves significant redundant space around the terminal assembly 2 to ensure ease of installation and maintenance, resulting in a relatively high overall height of the terminal assembly and impacting the energy density of the battery cell 100. To address this, this invention designs the battery cover as an independently formed cover body 11 and a connector 12. The connector 12 is welded to the cover body 11, and the connector 12, terminal assembly 2, and insulating layer 3 form an independent terminal structure, significantly reducing this redundant space and making the entire cover assembly more compact. Because the internal space of the battery is utilized more effectively, more or larger capacity battery cells 100 can be accommodated within the same external dimensions, thereby increasing the volumetric energy density of the battery. Furthermore, the independent terminal assembly is directly electrically connected to the cover body via the connector, simplifying the assembly process.

[0042] Please see Figure 1-3 This utility model provides an independent pole, including a connector 12, a pole assembly 2 and an insulating layer 3;

[0043] The connector 12 has a pole hole 1211 and is configured to be electrically connected to the cover plate body 11; the pole assembly 2 is inserted into the pole hole 1211 and is electrically connected to the connector 12; an insulating layer 3 is provided between the pole assembly 2 and the connector 12.

[0044] It should be noted that in this case, the battery cover is designed as a cover body 11 and a connector 12. The cover body 11 and the connector 12 are formed independently. The cover body 11 and the connector 12 are connected by welding, fasteners, or other means that meet the usage requirements. In this case, the connector 12 is first installed together with the terminal assembly 2 and the insulating layer 3 to form an independent terminal. In a subsequent step, the connector 12 is welded to the cover body 11. This battery cover is used to cooperate with the housing (not shown) to form a cavity for housing the battery cell 100. The terminal assembly 2 is electrically connected to the tab 101 of the battery cell 100 to guide the input and output terminals of the battery cell 100 to the outside of the housing. Along the Y-direction perpendicular to the thickness direction, the cross-section of the connector 12 is circular, elliptical, approximately elliptical, or square, or it can be formed by combining multiple structures. The cross-section of the insulating layer 3 can also be circular, elliptical, approximately elliptical, or square, depending on actual needs. Of course, the insulating layer 3 can also be a split design. In a specific embodiment, both the cover plate body 11 and the connector 12 can be made of metal materials, such as plain aluminum plates. In a specific embodiment, the insulating layer 3 is an insulating material, such as plastic or rubber. The pole assembly 2 can be formed by connecting several parts together, or it can be independently formed from a metal material, such as aluminum.

[0045] This design transforms the original one-piece battery cover into two independently formed parts: a cover body 11 and a connector 12. The connector 12 is welded to the cover body 11. The connector 12, the terminal assembly 2, and the insulating layer 3 form an independent terminal structure, reducing unnecessary redundant space. This allows for the inclusion of more or larger-capacity battery cells 100 without increasing the external dimensions, thus improving the battery's volumetric energy density. For example, dividing the battery cover into the cover body 11 and the connector 12 allows for the optimization of the design of each part. The connector 12 is specifically designed for mounting the terminal assembly 2 and the insulating layer 3, while the cover body 11 primarily provides overall structural support. This separate design allows each part to be optimized according to its specific function, thereby reducing unnecessary space waste.

[0046] Please see Figure 3 and Figure 5As an optional embodiment of this case, the connector 12 includes a stepped structure 122 for interlocking with the cover plate body 11. The connector 12 is fixedly connected to the cover plate body 11 through the stepped structure 122. The specific shape of the stepped structure 122 can be designed according to actual usage requirements and convenience, thereby facilitating the subsequent welding connection between the cover plate body 11 and the connector 12, improving connection convenience and structural stability. Simultaneously, the stepped structure 122 can provide positioning in both the thickness and horizontal directions. Due to the presence of the stepped structure 122, accurate alignment of the connector 12 and the cover plate body 11 can be ensured before welding, thus avoiding the need for additional positioning tools. This not only saves time and manpower but also reduces operational complexity. The self-positioning stepped structure 122 can accurately maintain the alignment of the connector 12 and the cover plate body 11, ensuring the precision of the weld joint position. This precision is crucial for ensuring weld quality and battery safety, reducing welding defects caused by misalignment.

[0047] Please see Figure 7 As an optional embodiment of this case, the distance h2 between the outer end face of the pole assembly and the outer end face of the first protrusion 1221 is at least 0.2 mm, thereby facilitating the welding of the busbar to the pole assembly 2.

[0048] Please see Figure 3 and Figure 5 As an optional embodiment of this case, the connector 12 includes an annular body 121 riveted to the pole post assembly; the outer end of the annular body 121 is provided with a first protrusion 1221, the first protrusion 1221 being annular in shape, and a second protrusion 1222 extending radially between the annular body 121 and the first protrusion 1221, the second protrusion 1222 being located on the side of the connector 12 away from the pole post assembly 2; the second protrusion 1222 intersects with the first protrusion 1221 to form an annular stepped structure 122, wherein the radial direction is perpendicular to the thickness direction, that is... Figure 3 in the Y direction.

[0049] It should be noted that the annular stepped structure 122 increases the contact area between the cover plate body 11 and the connector 12, thereby improving the stability and strength of the welded connection. It also allows the battery cover plate to distribute stress more evenly when subjected to external pressure, effectively preventing structural damage caused by excessive localized stress. Simultaneously, the annular stepped design also helps improve the overall rigidity of the battery cover plate, reducing deformation and ensuring the integrity and safety of the battery's internal structure.

[0050] Please see Figure 5 and Figure 6As an optional embodiment of this case, the thickness m of the second protrusion 1222 is 0.5 mm to 1.0 mm, for example, m is 0.6 mm, 0.8 mm, or 0.9 mm; the depth n of the annular stepped structure 122 in the thickness direction is 0.3 mm to 0.8 mm, for example, n is 0.4 mm, 0.5 mm, or 0.7 mm; the width k of the annular stepped structure 122 in the protruding direction of the second protrusion 1222 is 0.3 mm to 1.0 mm, for example, k is 0.4 mm, 0.5 mm, or 0.7 mm. The purpose of this design is to ensure that the connection between the cover body 11 and the connector 12 has sufficient strength and stability, while providing appropriate space to accommodate welding materials or sealant, thereby enhancing the sealing performance and structural integrity of the battery cover. For example, the thickness design of the second protrusion 1222 ensures sufficient mechanical strength to withstand internal pressure changes and external physical impacts, preventing deformation or breakage during long-term use. The depth design of the annular stepped structure 122 in the thickness direction provides ample space to accommodate welding materials or sealant. The width design of the annular stepped structure 122 in the protruding direction of the second protrusion 1222 takes into account manufacturing process and assembly convenience, providing operators with sufficient visibility and operating space, reducing production difficulty and error rates.

[0051] Please see Figure 7 As an optional embodiment of this case, the outer end of the annular body 121 abuts against the inner end of the insulating layer 3, and the distance X between the first protrusion 1221 and the insulating layer 3 is 2 mm to 4 mm, for example, X is 2.5 mm, 3 mm, or 3.5 mm.

[0052] It should be noted that the first outer end face 1223 of the annular body 121 on the side of the first protrusion 1221 near the electrode body 21 mainly bears the riveting force of the electrode assembly 2. The inner end of the insulating ring 31 of the insulating layer 3 abuts against the first outer end face 1223, thereby ensuring that the electrode assembly 2 and the insulating layer 3 can be accurately and stably installed on the connector 12, reducing assembly errors, thereby ensuring the overall performance and safety of the battery, and improving production efficiency and product quality.

[0053] Please see Figure 6 As an optional embodiment of this case, the distance h1 between the outer end face of the first protrusion 1221 and the annular body 121 in the thickness direction is at most 1 mm, for example, h1 is 0.5 mm or 0.8 mm.

[0054] It should be noted that the distance between the first protrusion 1221 and the annular body 121 in the thickness direction is mainly related to the thickness of the tab 101. This ensures that the electrode assembly 2 can be stably inserted and fixed in the electrode hole 1211 of the connector 12, while leaving sufficient space to accommodate changes in the thickness of the tab 101. By limiting this distance, assembly difficulties or structural instability caused by an excessively thick tab 101 can be effectively avoided, thereby improving the overall reliability and safety of the cover assembly. Furthermore, this design also helps to improve the energy density of the battery. Because the distance between the first protrusion 1221 and the annular body 121 is optimized, the internal space layout of the battery is more compact, thus achieving higher energy storage capacity within a limited space. This is particularly important for battery products that pursue high energy density, as it directly affects battery performance and range.

[0055] Please see Figure 3 and Figure 8 As an optional embodiment of this case, the pole assembly 2 includes a pole body 21 and a limiting piece 22; the limiting piece 22 is made of a first material, the hardness of the first material is greater than the hardness of the first conductive material, the limiting piece 22 is engaged with the pole body 21 in the thickness direction of the pole body 21, the part of the pole body 211 engaged with the limiting piece 22 is made of the first conductive material, and the limiting piece 22 abuts against the outer end of the insulating layer 3.

[0056] It should be noted that the limiting piece 22 is made of a first material, and the conductivity of the first material is not particularly limited; it can be a conductive material or an insulating material. In the prior art, the terminal post is generally directly riveted to the battery cover plate. Due to the influence of the terminal post material (generally aluminum), the thickness of the riveted part is generally relatively thick, resulting in a relatively high overall height of the terminal post and affecting the energy density of the battery cell 100. This invention adds a limiting piece 22 made of a high-hardness material to the outer end of the terminal post body 21, and uses the limiting piece 22 to limit the distance between the terminal post assembly 2 and the end face of the connector 12. While meeting structural strength requirements, it can effectively reduce the thickness of the limiting structure between the terminal post assembly 2 and the cover plate body 11, thereby reducing the overall height of the terminal post assembly 2, improving the space utilization of the battery, and thus increasing the volumetric energy density of the battery.

[0057] like Figure 3 or Figure 4 or Figure 11As shown, in an optional embodiment of this case, the insulating layer 3 includes an insulating ring 31 and a sealing ring 32. The insulating layer 3 at least covers the sidewall of the pole hole 1211 and the area of ​​the outer side of the connector 12 near the edge of the pole hole 1211. The connector 12 abuts against the inner end of the insulating ring 21. The sealing ring 32 at least covers a portion of the inner side of the connector 12. For example, the sealing ring 32 covers the area of ​​the inner side of the connector 12 near the pole hole 1211, and the sealing ring 32 can abut against the inner end of the connector 12 and the insulating ring 31.

[0058] It should be noted that the insulating ring 31 is generally made of plastic material, and the sealing ring 32 is generally made of elastic rubber material; the connector 12 and the pole assembly 2 are isolated by the insulating layer 3, specifically by the insulating ring 21 and the sealing ring 32. It should be understood that the insulating layer 3 here includes at least the insulating ring 31.

[0059] Please see Figure 3 As an optional embodiment of this case, the pole body 21 includes a pole body 211 and a pole base plate 212 connected to the inner end of the pole body 211, wherein the pole base plate 212 is made of a second conductive material.

[0060] The sealing ring 32 is located between the electrode base plate 212 and the connector 12, so that the first conductive material on the inner side of the cover plate body 11 is covered and sealed by the second conductive material, the sealing ring 32 and / or the insulating layer 3, thereby preventing the first conductive material and the second conductive material from corroding the galvanic cell when the two different conductive materials come into contact with the electrolyte at the same time.

[0061] like Figure 2 , Figure 9 and Figure 10 As shown, this utility model also provides a cover plate assembly, including the aforementioned independent pole and cover plate body 11; the cover plate body 11 is provided with a mounting hole 1121, the edge of the mounting hole 1121 is welded to the connector 12 of the independent pole, it should be understood that the edge of the mounting hole 1121 is adapted to the stepped structure 122, and the outermost end face of the cover plate body 11 can be flush with the outermost end face of the connector 12.

[0062] As an optional embodiment of this case, such as Figure 2 , Figure 9 and Figure 10 As shown, the cover plate body 11 includes an integrally formed first plate 111, two second plates 112, and a transition portion 113 connecting the first plate 111 and the second plates 112.

[0063] Two second plates 112 are spaced apart, and the entire second plate 112 is positioned further outward relative to the entire first plate 111. Mounting holes 1121 are provided on both second plates 112, and these mounting holes are through holes. Through detailed structural design of the cover plate body 11, the entire cover plate assembly structure can be made more compact.

[0064] Please see Figure 3 and Figure 5 In one optional embodiment of this invention, the outer end of the connector 12 is flush with the outer end face of the cover plate body 11. The outer end face of the terminal assembly 2 is positioned closer to the outer side relative to the outer end face of the connector 12. The outer end face of the terminal body 21 forms a welding surface for welding the busbar, which is the current bus. That is, the outer end face of the terminal assembly 2 is positioned closer to the outer side relative to the outer end face of the first protrusion 1221 of the connector 12. By positioning the outer end face of the terminal body 21 further outward, this invention ensures that the terminal assembly 2 is connected to the current busbar, effectively preventing the force on the current busbar from being simultaneously transmitted to the connector 12. This design reduces the impact of external forces on the riveting area, thereby reducing the risk of connection failure and ensuring the reliability of the battery system.

[0065] like Figure 2 , Figure 9 As shown, in an optional embodiment of this case, the first plate 111 is provided with an explosion-proof hole, which is located between the two second plates 112. The explosion-proof hole is used to install an explosion-proof component, which includes at least an explosion-proof sheet and an explosion-proof valve patch.

[0066] Please see Figure 3 and Figure 11 As an optional embodiment of this case, an insulating plate 5 is also provided on the inner side of the cover plate body 11. The electrode base plate 212 extends to the inner side of the insulating plate 5 and is spaced apart from the insulating plate 5. A cavity 102 for accommodating the electrode tab 101 is formed between the electrode base plate 212 and the insulating plate 5. This allows the electrode tab 101 to share a space with the electrode assembly 2 along the thickness direction of the electrode assembly 2, reducing the overall height of the battery and further improving the volumetric energy density of the battery.

[0067] Please see Figure 2 , Figure 3 and Figure 4 As shown, there are two electrode post assemblies 1, one of which is a positive electrode post assembly, for example... Figure 4 In the structure shown, the other electrode assembly 1 is a negative electrode assembly; the inner end of the electrode body 21 of the negative electrode assembly is made of a second conductive material, that is, the electrode base plate 212 is made of a second conductive material, for example... Figure 3The structure shown.

[0068] Please see Figure 8 In another embodiment of this invention, the insulating ring 31 covers the sidewall of the pole hole 1211 and the area on the outside of the connector 12 near the edge of the pole hole 1211, as well as the area on the inside of the connector 12 near the edge of the pole hole 1211, thereby further isolating the external environment and enhancing the protective effect. The precise coverage of the insulating ring 31 in this invention ensures electrical isolation while minimizing the amount of insulating material used, thus saving space.

[0069] Please see Figure 11 The present invention provides a secondary battery, including the cover plate assembly, the battery cell 100 and the outer casing. The outer casing is connected to the cover plate assembly to form a cavity for housing the battery cell 100. The battery cell 100 is housed in the cavity, and the tab 101 of the battery cell 100 is electrically connected to the terminal body 21.

[0070] Regarding the assembly process of the cover plate assembly: First, the connector 12, the pole assembly 2, and the insulation layer 3 are assembled into one piece to form an independent pole. Then, the independent pole passes through the mounting hole 1121 of the cover plate body 11. The pole base plate 212 is located inside the cover plate body 11, so that the independent pole is assembled with the cover plate body 11. The connector 12 of the independent pole is welded to the cover plate body 11, thereby realizing the assembly of the cover plate assembly.

[0071] In summary, this utility model effectively overcomes some practical problems in the prior art, thus having high utilization value and significance.

[0072] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An independent pole, characterized in that, include: A connector having a pole hole and configured to be electrically connected to the cover plate body; The electrode assembly is inserted into the electrode hole, and the electrode assembly is electrically connected to the connector; An insulating layer is provided between the pole assembly and the connector.

2. The independent pole piece according to claim 1, characterized in that, The connector includes a stepped structure for interlocking with the cover plate body, and the connector is welded to the cover plate body through the stepped structure.

3. The independent pole piece according to claim 2, characterized in that, The connector includes an annular body that is riveted to the pole assembly; the outer end of the annular body is provided with a first protrusion, and a second protrusion extends radially between the annular body and the first protrusion, the second protrusion being located on the side of the connector away from the pole assembly, and the second protrusion intersecting with the first protrusion to form the stepped structure.

4. The independent pole according to claim 3, characterized in that, The thickness of the second protrusion is 0.5 mm to 1.0 mm, and the depth of the annular step structure in the thickness direction is 0.3 mm to 0.8 mm; the width of the annular step structure in the protruding direction of the second protrusion is 0.3 mm to 1.0 mm.

5. The independent pole piece according to claim 3, characterized in that, The distance between the first protrusion and the insulating layer is 2 mm to 4 mm, and / or the distance between the first protrusion and the annular body in the thickness direction is at most 1 mm.

6. The independent pole piece according to claim 1, characterized in that, The pole assembly includes a pole body and a limiting plate; The limiting piece is made of a first material. The limiting piece is engaged with the electrode body in the thickness direction of the electrode body. The part of the electrode body that is engaged with the limiting piece is made of a first conductive material. The hardness of the first material is greater than that of the first conductive material. The limiting piece abuts against the outer end of the insulating layer.

7. The independent pole piece according to claim 1, characterized in that, The insulating layer includes an insulating ring and a sealing ring. The insulating ring covers at least the sidewall of the pole hole and the area on the outside of the connector near the edge of the pole hole. The connector abuts against the inner end of the insulating ring. The sealing ring covers at least a portion of the inner side of the connector.

8. A cover plate assembly, characterized in that, Includes the independent pole and cover plate body as described in any one of claims 1-7; The cover plate body is provided with mounting holes, and the edge of the mounting holes is welded to the connector of the independent pole.

9. The cover plate assembly according to claim 8, characterized in that, The outer end of the connector is flush with the outer end face of the cover plate body, and the outer end face of the pole assembly is positioned closer to the outer side relative to the outer end face of the connector.

10. The cover plate assembly according to claim 8, characterized in that, The cover plate body includes an integrally formed first plate, two second plates, and a transition portion connecting the first plate and the second plates; Two second plates are spaced apart and are positioned closer to the outer side relative to the first plate, and the mounting holes are located on each of the second plates.

11. The cover plate assembly according to claim 10, characterized in that, An insulating plate is also provided on the inner side of the cover plate body. The inner end of the pole assembly includes a pole base plate. The pole base plate extends to the inner side of the insulating plate and is spaced apart from the insulating plate. A clamping cavity for accommodating the pole tab is formed between the pole base plate and the insulating plate.

12. A secondary battery, characterized in that, The invention includes a cover plate assembly as described in any one of claims 8-11, a battery cell, and a housing, the housing being connected to the cover plate assembly to form a cavity for housing the battery cell, the battery cell being housed within the cavity, and the tabs of the battery cell being electrically connected to the electrode body.

Images