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 which 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; the insulating layer is arranged between the pole assembly and the connecting piece; the pole assembly comprises a pole body and a limiting piece, and a first flange is arranged at the inner end of the pole body; the limiting piece is made of a first material, at least the outer end of the pole body is made of a first conductive material, and the hardness of the first material is greater than that of the first conductive material; according to the independent pole provided by the utility model, the height of the pole can be reduced, and unnecessary redundant space between the pole assembly and the battery cover plate can be reduced, so that the energy density of the battery is improved.

Description

Technical Field

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

[0003] In existing technologies, the terminals are typically riveted directly to the top cover. Due to the limitations of the terminal material (usually aluminum), the riveted area is generally quite thick, resulting in a relatively high overall height of the terminal and affecting the energy density of the battery cell. Furthermore, in existing technologies, the battery cover is generally a one-piece design. This one-piece design often requires a large amount of redundant space around the terminal assembly to ensure ease of installation and maintenance, thus leading to a relatively high overall height of the terminal and impacting the energy density of the battery cell. Utility Model Content

[0004] 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 that can reduce the height of the terminal post and reduce unnecessary redundant space between the terminal post assembly and the battery cover plate, thereby improving the energy density of the battery.

[0005] To achieve the above and other related objectives, this utility model provides an independent pole, comprising:

[0006] A connector having a pole hole, and configured to be electrically connected to the cover plate body;

[0007] The electrode assembly is inserted into the electrode hole, and the electrode assembly is electrically connected to the connector;

[0008] An insulating layer is disposed between the pole assembly and the connector;

[0009] The electrode assembly includes an electrode body and a limiting piece. The inner end of the electrode body is provided with a first flange. The limiting piece is made of a first material. At least the outer end of the electrode body is made of a first conductive material. The hardness of the first material is greater than the hardness of the first conductive material. The limiting piece is engaged with the electrode body in the thickness direction of the electrode body, and the limiting piece abuts against the outer end of the insulating layer.

[0010] In one embodiment of the present invention, the connector includes a stepped portion for engaging with the cover plate body, and the connector is welded to the cover plate body through the stepped portion.

[0011] In one embodiment of this utility model, the limiting piece includes: a snap-fit ​​portion, a limiting portion, and a connecting portion. The snap-fit ​​portion snaps into the side wall of the outer end of the pole body, the limiting portion abuts against the outer end of the insulating layer, the snap-fit ​​portion and the limiting portion are spaced apart by a distance in the thickness direction of the pole body, and the snap-fit ​​portion is closer to the inner end of the pole body than the limiting portion; the snap-fit ​​portion and the limiting portion are connected as one unit through the connecting portion.

[0012] In one embodiment of the present invention, the pole body includes a first section, a second section and a third section in sequence from the outside to the inside along its thickness direction, wherein the sidewalls of the first section and the third section protrude from the sidewall of the second section; the snap-fit ​​portion is clamped between the edge of the first section and the edge of the third section.

[0013] In one embodiment of this utility model, the outer end of the pole body is flush with or protrudes from the outer end of the limiting portion.

[0014] In one embodiment of the present invention, the insulating layer covers at least the sidewall of the pole hole and the inner and outer regions of the connector near the edge of the pole hole, and the insulating layer includes an insulating ring and / or a sealing ring.

[0015] In one embodiment of this utility model, there are two electrode components, one of which is a positive electrode component and the other is a negative electrode component; the inner end of the electrode body of the negative electrode component is made of a second conductive material.

[0016] In one embodiment of the present invention, the first flange is made of a second conductive material, and a sealing ring is provided between the first flange and the inner end of the connector, so that the first conductive material on the inner side of the battery cover is covered and sealed by the second conductive material, the sealing ring and / or the insulating ring.

[0017] In one embodiment of this utility model, the limiting piece is an annular structure continuously distributed along the edge of the pole hole.

[0018] In one embodiment of the present invention, the connector includes an annular body riveted to the pole post assembly; a first protrusion is provided at the outer end of the annular body, 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 a ring-shaped stepped portion.

[0019] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a cover plate assembly, including the independent pole and the cover plate body, wherein the cover plate body is provided with a mounting hole, and the edge of the mounting hole is welded to the connector of the independent pole.

[0020] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a secondary battery, including the cover plate assembly, a battery cell and a housing, wherein the housing is connected to the cover plate assembly to form a cavity for housing the battery cell, the battery cell is housed in the cavity, and the tabs of the battery cell are electrically connected to the terminal body.

[0021] In summary, this invention adds a high-hardness material limiting piece to the outer end of the terminal post, and uses the limiting piece to limit the distance between the terminal post assembly and the outer end face of the connector. While meeting structural strength requirements, it effectively reduces the thickness of the limiting structure between the terminal post assembly and the battery cover, thereby reducing the overall height of the terminal post assembly and improving the space utilization rate of the battery, i.e., increasing the volumetric energy density of the battery. Simultaneously, this invention designs the battery cover as a separate cover body and connector. The connector, terminal post assembly, and insulating ring can be assembled to form an independent terminal post structure. The connector is then welded to the cover body during subsequent assembly, significantly reducing redundant space and making the entire battery cover more compact. Because the internal space of the battery is utilized more effectively, it means that more cells or larger capacity cells can be accommodated within the same external dimensions, thus increasing the volumetric energy density of the battery. Furthermore, the independent terminal post is directly electrically connected to the cover body via the connector, simplifying the assembly process and avoiding the obstruction of welding the inner end of the terminal post assembly to other components such as the tabs after the integrated battery cover is directly connected to the terminal post assembly. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a three-dimensional structural schematic diagram of an independent pole in one embodiment of the present invention;

[0024] Figure 2 This is a three-dimensional structural schematic diagram of the cover plate assembly in one embodiment of the present utility model;

[0025] Figure 3 for Figure 2The cross-sectional view of the AA structure in the image shows the location of the independent negative electrode post.

[0026] Figure 4 for Figure 2 The cross-sectional view of the BB structure in the image shows the location of the independent positive electrode post.

[0027] Figure 5 This is a schematic diagram of the limiting piece structure in one embodiment of the present invention;

[0028] Figure 6 This is a three-dimensional structural diagram of the limiting piece in one embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the pole body structure in one embodiment of the present invention;

[0030] Figure 8 This is a three-dimensional structural diagram of the pole assembly in one embodiment of the present invention;

[0031] Figure 9 This is a three-dimensional structural diagram of the cover plate body in one embodiment of the present utility model;

[0032] Figure 10 This is a cross-sectional view of the cover plate body structure in one embodiment of the present utility model;

[0033] Figure 11 This is a cross-sectional view of a secondary battery structure in one embodiment of the present invention;

[0034] Component labeling description: Cover plate body 11, First plate 111, Second plate 112, Mounting hole 1121, Transition part 113, Connector 12, Annular body 121, Step part 122, First protrusion 1221, Second protrusion 1222, Terminal hole 1211, Terminal assembly 2, Terminal body 21, First section 211, Second section 212, Third section 213, Terminal base plate 2131, Limiting piece 22, Snap-fit ​​part 221, Limiting part 222, Connecting part 223, Insulating layer 3, Insulating ring 31, Sealing ring 32, Battery cell 100, Electrode tab 101. Detailed Implementation

[0035] 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.

[0036] Please see Figures 1 to 11 It 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.

[0037] 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.

[0038] 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. The thickness direction described in this application is... Figure 3 The X direction.

[0039] Please see Figure 11A secondary battery, also known as a rechargeable battery or energy storage battery, is a battery that can be charged by an external electrical energy source and release electrical energy when needed. A secondary battery includes a casing, a battery cell 100, and a cover plate. The battery cell 100 is housed within the casing, and the cover plate is connected to the casing to enclose the battery cell 100 within the casing. The cover plate generally has terminals; the inner end of the terminal is connected to the tab 101 of the battery cell 100, while the outer end of the terminal protrudes from the cover plate for connection to a busbar.

[0040] In existing technologies, the terminals are typically riveted directly to the top cover. Due to the limitations of the terminal material (usually aluminum), the thickness of the riveted area is generally quite thick, resulting in a relatively high overall height of the terminal and affecting the energy density of the battery cell 100. To address this, this invention adds a high-hardness limiting piece 22 to the outer end of the terminal, using this limiting piece 22 to limit the distance between the terminal assembly 2 and the outer end face of the connector 12. While maintaining structural strength, this effectively reduces the thickness of the limiting structure between the terminal assembly 2 and the battery cover, thereby reducing the overall height of the terminal assembly 2 and improving the battery's space utilization, i.e., increasing the battery's volumetric energy density. Furthermore, in existing technologies, the battery cover is generally a one-piece design, meaning the cover body 11 and the connector 12 are integrally formed, rather than separately. One-piece battery cover designs often leave a large amount of 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 2 and affecting the energy density of the battery cell 100. To address this, the present invention designs the battery cover as a separately formed cover body 11 and connector 12. The connector 12, terminal assembly 2, and insulating ring 3 can form an independent terminal structure. In subsequent assembly processes, the connector 12 is welded to the cover body 11 to form the cover assembly, thereby significantly reducing redundant space and making the entire cover assembly more compact. Because the internal space of the battery is utilized more effectively, this means that more cells 100 or larger capacity cells 100 can be accommodated within the same external dimensions, thus improving the volumetric energy density of the battery.

[0041] Please see Figures 1-4 This utility model provides an independent pole, including a connector 12, a pole assembly 2, and an insulating ring 3; the connector 12 has a pole hole 1211 and is configured to be welded to a cover plate body 11; the pole assembly 2 is inserted into the pole hole 1211 and is riveted to the connector 12; the insulating layer 3 is disposed between the pole assembly 2 and the connector 12.

[0042] The electrode assembly 2 includes an electrode body 21 and a limiting piece 22. The inner end of the electrode body 21 is provided with a first flange 211. The limiting piece 22 is made of a first material. At least the outer end of the electrode body 21 is made of a first conductive 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 electrode body 21 in the thickness direction of the electrode body 21, and the limiting piece 22 abuts against the outer end of the insulating layer 3.

[0043] It should be noted that in this case, the connector 12 is first installed together with the terminal assembly 2 and the insulating ring 3 to form an independent terminal, and then the connector 12 is welded to the cover plate body 11 at the end. The battery cover plate 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 a combination of multiple structures. The cross-section of the terminal assembly 2 is circular, elliptical, approximately elliptical, or square, and the specific design can be made according to actual needs.

[0044] In a specific embodiment, both the cover plate body 11 and the connector 12 can be made of metal, such as a plain aluminum plate. In a specific embodiment, the insulating layer 3 can be made of, for example, plastic and / or rubber, because the insulating layer 3 can be a single component or multiple components. The pole assembly 2 can be formed by connecting several components together, or it can be independently formed from a single metal material, such as aluminum. 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. When the pole body 21 is made of aluminum, the limiting piece 22 can be made of copper.

[0045] This invention designs the battery cover as a separately formed cover body 11 and connector 12. The connector 12, terminal post assembly 2, and insulating ring 3 are first assembled into an independent terminal post structure. During subsequent assembly, the connector 12 is welded to the cover body 11, thereby reducing unnecessary redundant space. This allows for the inclusion of more or larger capacity battery cells 100 without increasing external dimensions, thus improving the battery's volumetric energy density. For example, dividing the battery cover into the cover body 11 and connector 12 allows for the optimization of the design of each part. The connector 12 is specifically used to install the terminal post assembly 2 and insulating ring 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, reducing unnecessary space waste. Simultaneously, the independent terminal post is directly electrically connected to the cover body 11 via the connector 12, simplifying the assembly process.

[0046] This invention adds a high-hardness limiting piece 22 to the outer end of the electrode post body 21. The limiting piece 22 is stronger than the electrode post body 21. Taking steel as an example, the strength of steel is about three times that of aluminum, allowing for a thinner thickness. The limiting piece 22 is used to limit the distance between the electrode post assembly 2 and the outer end face of the connector 12. While meeting structural strength requirements, it effectively reduces the thickness of the limiting structure between the electrode post assembly 2 and the connector 12, thereby reducing the overall height of the electrode post assembly 2 and improving the space utilization of the battery, which in turn increases the volumetric energy density of the battery. Furthermore, in this invention, the electrode post body 21 is directly riveted to the high-strength limiting piece 22 and indirectly pressed onto the insulating layer 3, preventing the insulating layer 3, which is at least partially made of plastic, from cracking during riveting, thus facilitating the smooth implementation of the assembly process.

[0047] Please see Figure 3 and Figure 5 As an optional embodiment of this case, the connector 12 includes a stepped portion 122 for engaging with the cover plate body 11. The connector 12 is welded to the cover plate body 11 via the stepped portion 122. The specific shape of the stepped portion 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 portion 122 can provide positioning in both the thickness and horizontal directions. Due to the presence of the stepped portion 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 portion 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.

[0048] Please see Figure 3 and Figure 6 As an optional embodiment of this case, the limiting piece 22 includes: a snap-fit ​​portion 221, a limiting portion 222, and a connecting portion 223. The snap-fit ​​portion 221 snaps into the side wall of the outer end of the pole body 21, and the limiting portion 222 abuts against the outer end of the insulating ring 3. The snap-fit ​​portion 221 and the limiting portion 222 are spaced apart by a distance in the thickness direction of the pole body 21, and the snap-fit ​​portion 221 is closer to the inner end of the pole body 21 than the limiting portion 222. The snap-fit ​​portion 221 and the limiting portion 222 are connected as one unit through the connecting portion 223. In a specific embodiment, the pole body 21 and the snap-fit ​​portion 221 can be connected, for example, by riveting. This embodiment utilizes the positional difference between the snap-fit ​​portion 221 and the limiting portion 222 to shift the riveting position of the electrode body 21 to a region closer to the inner end of the electrode body 21. While ensuring the riveting strength between the electrode body 21 and the limiting piece 22, it reduces the protrusion height of the outer end of the electrode body 21, thereby further improving the energy density of the battery.

[0049] Please see Figure 3 and Figure 7 As an optional embodiment of this case, the pole body 21 includes a first section 211, a second section 212 and a third section 213 in sequence from the outside to the inside along its thickness direction, wherein the sidewalls of the first section 211 and the third section 213 protrude from the sidewall of the second section 212; the snap-fit ​​portion 221 is clamped between the edge of the first section 211 and the edge of the third section 213. It should be understood that the above-mentioned division of the pole body 21 into regions is only for the convenience of describing the fit between the limiting piece 22 and the pole body 21, and does not mean that the pole body 21 necessarily has multiple independent structures. In a specific embodiment, the first section 211, the second section 212 and the third section 213 can be an integral structure, for example. The part of the first section 211 that protrudes from the side wall of the second section 212 can be formed by riveting. Specifically, before riveting, the side wall of the first section 211 may not protrude from the side wall of the second section 212. At this time, it is convenient to place the snap-fit ​​part 221 on the outside of the second section 212, and then rivet the first section 211 so that the edge of the first section 211 presses against the outside of the snap-fit ​​part 221, thereby realizing the connection between the limiting piece 22 and the pole body 21.

[0050] Please see Figure 3 , Figure 7 and Figure 8 Please see Figure 2As an optional embodiment of this case, the third section 213 includes a pole base plate 2131, which is made of a second conductive material, and the first flange 211 is located on the pole base plate 2131.

[0051] As an optional embodiment of this case, the outer end of the pole body 21 is flush with or protrudes from the outer end of the limiting part 222, thereby facilitating the subsequent welding between the pole body 21 and the busbar.

[0052] In one embodiment of this utility model, such as Figure 11 As shown, the insulating layer 3 covers at least the sidewall of the pole hole 1211 and the inner and outer regions of the connector 12 near the edge of the pole hole 1211. The insulating layer 3 includes an insulating ring 31 and / or a sealing ring 32. The precise coverage of the insulating ring 3 in this case ensures electrical isolation while minimizing the amount of insulating material used, thereby saving space.

[0053] Please see Figure 3 , Figure 7 and Figure 8 As an optional embodiment of this case, the electrode assembly 2 is provided in two parts, one of which is a positive electrode assembly 2, for example... Figure 4 The structure shown; another electrode assembly 2 is a negative electrode assembly 2, the inner end of the electrode body 21 of the negative electrode assembly 2 is made of a second conductive material, that is, the electrode base plate 2131 is made of a second conductive material, for example. Figure 3 The structure shown.

[0054] It should be understood that the positive and negative tabs 101 of the battery cell 100 are generally made of different materials. For example, the positive tab 101 is generally made of aluminum, and the negative tab 101 is generally made of copper. Since copper and aluminum cannot be welded together, the inner end of the negative electrode post assembly 2 needs to be made of the same material as the negative tab 101, for example, by setting a layer of copper material on the inner end of the negative electrode post assembly 2.

[0055] Please see Figure 3 As an optional embodiment of this case, the first flange 211 is made of a second conductive material, and the sealing ring 32 is disposed between the first flange 211 and the inner end of the connector 12, so that the first conductive material on the inner side of the battery cover is covered and sealed by the second conductive material, the sealing ring 32 and / or the insulating ring 31. This can prevent galvanic corrosion when two different conductive materials come into contact with the electrolyte at the same time.

[0056] As an optional embodiment of this case, such as Figure 7As shown, the limiting piece 22 is an annular structure continuously distributed along the edge of the pole post hole 1211. It should be understood that in some other embodiments, the limiting piece 22 may also be multiple independent structures spaced apart along the circumference of the pole post.

[0057] 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 portion 122, wherein the radial direction is perpendicular to the thickness direction, that is... Figure 3 in the Y direction.

[0058] It should be noted that the annular stepped portion 122 increases the contact area between the cover body 11 and the connector 12, thereby improving the stability and strength of the welded connection. It also allows the battery cover 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, reducing deformation and ensuring the integrity and safety of the battery's internal structure.

[0059] Please see Figure 3 or Figure 4 As an optional embodiment of this case, 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. The outer end face of the terminal body 21 forms a welding surface for welding a busbar, which is a current bus. By positioning the outer end face of the terminal body 21 further outward, the connection between the terminal assembly 2 and the busbar is ensured, effectively preventing the force on the 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.

[0060] As an optional embodiment of this case, the first material is steel, the first conductive material is aluminum, and / or the second conductive material is steel.

[0061] like Figure 2 , Figure 9 and Figure 10As 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 step portion 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 entirety of the two second plates 112 is positioned closer to the outer side relative to the entirety of the first plate 111. The mounting hole 1121 is provided on the two second plates 112, and the mounting hole 112 is a through hole.

[0064] It should be noted that, since an insulating plate is provided between the pole base plate 2131 and the cover plate body 11, and the insulating plate and the pole base plate 2131 have a receiving cavity for accommodating the tab 101, and the pole base plate 2131 has a welding surface for welding the tab 101, the welding surface constitutes one side cavity wall of the receiving cavity, therefore, in this case, by setting the second plate body 112 to be set closer to the outer side relative to the first plate body 111, more area is left in the receiving cavity, avoiding the tab 101 from protruding towards the cover plate body 11 after welding, which would cause difficulties in the subsequent installation of the cover plate body 11, the insulating plate 4, etc., thus facilitating the smooth progress of the assembly process.

[0065] Regarding the assembly process of the cover plate assembly: In the prior art, the processing process of the integrated battery cover plate is to rivet first and then weld. Since this application requires the tab 101 to be welded to the terminal base plate 2131, if the battery cover plate is riveted first, the battery cover plate will block the welding position of the tab 101. Therefore, in this application, the connector 12, the terminal assembly 2 and the insulating component 3 will be assembled into one piece to form an independent terminal. Then, the tab 101 will be welded, and the battery will be folded to make the core closed. In the subsequent assembly process, the independent terminal will be passed through the mounting hole 1121 of the cover plate body 11. The terminal base plate 2131 is located inside the cover plate body 11, so that the independent terminal is assembled with the cover plate body 11. The connector 12 is welded to the cover plate body 11 to form a complete battery cover plate. Finally, the battery cover plate is welded to the battery casing.

[0066] Please see Figure 11 The present invention also provides a secondary battery, including the cover plate assembly, the battery cell 100 and the outer casing, the outer casing being connected to the cover plate assembly to form a cavity for housing the battery cell 100, the battery cell 100 being housed in the cavity, and the tab 101 of the battery cell 100 being electrically connected to the terminal body 21.

[0067] In summary, this utility model effectively overcomes some practical problems in the prior art, thus having high utilization value and significance.

[0068] 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 piece, characterized in that, include: A connector having a pole hole and configured to be electrically connected to the cover plate body; An electrode assembly is inserted into the electrode hole, and the electrode assembly is electrically connected to the connector, and an insulating layer is provided between the electrode assembly and the connector; The electrode assembly includes an electrode body and a limiting piece. The inner end of the electrode body is provided with a first flange. The limiting piece is made of a first material. At least the outer end of the electrode body is made of a first conductive material. The hardness of the first material is greater than the hardness of the first conductive material. The limiting piece is engaged with the electrode body in the thickness direction of the electrode body, and the limiting piece abuts against the outer end of the insulating layer.

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

3. The independent pole piece according to claim 1, characterized in that, The limiting piece includes a snap-fit ​​portion, a limiting portion, and a connecting portion. The snap-fit ​​portion snaps into the side wall of the outer end of the pole body, the limiting portion abuts against the outer end of the insulating layer, the snap-fit ​​portion and the limiting portion are spaced apart by a distance in the thickness direction of the pole body, and the snap-fit ​​portion is closer to the inner end of the pole body than the limiting portion; the snap-fit ​​portion and the limiting portion are connected as one unit through the connecting portion.

4. The independent pole according to claim 3, characterized in that, The pole body includes a first section, a second section and a third section in sequence from the outside to the inside along its thickness direction, wherein the sidewalls of the first section and the third section protrude from the sidewall of the second section; the snap-fit ​​portion is clamped between the edge of the first section and the edge of the third section.

5. The independent pole piece according to claim 3, characterized in that, The outer end of the pole body is flush with or protrudes from the outer end of the limiting part.

6. The independent pole piece according to claim 1, characterized in that, The insulating layer covers at least the sidewall of the pole hole and the inner and outer regions of the connector near the edge of the pole hole, and the insulating layer includes an insulating ring and / or a sealing ring.

7. The independent pole piece according to claim 6, characterized in that, The electrode assembly has two parts, one of which is a positive electrode assembly and the other is a negative electrode assembly; the inner end of the electrode body of the negative electrode assembly is made of a second conductive material.

8. The independent pole piece according to claim 7, characterized in that, The first flange is made of a second conductive material, and the sealing ring is disposed between the first flange and the inner end of the connector, so that the first conductive material on the inner side of the independent pole is covered and sealed by the second conductive material, the sealing ring and / or the insulating ring.

9. 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 intersecting with the first protrusion to form the stepped portion.

10. A cover plate assembly, characterized in that, The invention includes an independent pole as described in any one of claims 1-9, and a cover plate body, wherein the cover plate body is provided with a mounting hole, and the edge of the mounting hole is welded to the connector of the independent pole.

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