Electrode leading-out structure of directly-connected top and bottom pier rivet

Abstract

The utility model relates to an electrode leading-out structure directly connected with a top and bottom pier rivet. The electrode leading-out structure comprises a current collector and an electrode body, the current collector comprises a current collecting disc area, a current collecting transition area, a current collecting cylindrical area and a current collecting top area, and the current collecting cylindrical area is in a hollow cylinder shape; the electrode body comprises an electrode disc area, an electrode transition area, an electrode cylinder area and an electrode top area, and the electrode cylinder area is in a hollow cylinder shape. The electrode cylindrical area of the electrode body is directly sleeved and connected outside the current collecting cylindrical area of the current collector, and a circle of concave structure is formed in the range of the electrode cylindrical area of the electrode body and the current collecting cylindrical area of the current collector through a pier rivet, so that the electrode body and the current collector are tightly fixed together. Through the electrode lead-out structure directly connected with the top and bottom pier rivets, the processing and manufacturing efficiency can be improved, the use of conductive metal materials is reduced, the manufacturing cost is reduced, and meanwhile, the assembly efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical energy storage technology, specifically to an electrode lead-out structure with direct connection between the top and bottom piers. Background Technology

[0002] With the rapid emergence and development of new technologies in fields such as information technology, electronic products, and new energy vehicles, the research and development of energy storage capacitors is receiving increasing attention. Energy storage capacitors are a new type of energy storage device that falls between traditional capacitors and rechargeable batteries. They possess both the high-current, rapid charging and discharging characteristics of capacitors and the energy storage characteristics of batteries, with capacities reaching several thousand farads. Compared to traditional capacitors, energy storage capacitors have higher capacity; compared to batteries, they offer advantages such as faster charging speed, higher energy density, wider operating temperature range, and longer cycle life. Furthermore, they are environmentally friendly and particularly suitable for applications involving high-frequency, high-power, and high-energy charging and discharging. Therefore, they have broad market demand in strategic emerging industries such as rail transportation, wind power generation, buses, electric vehicles, and smart grids.

[0003] Currently, the electrode lead-out mechanism of energy storage capacitors mainly includes terminals, adapter plates, current collectors, and cover plates. For example, Chinese patent document CN112821015A discloses a copper-aluminum composite electrode post and negative electrode cover plate assembly structure and energy storage unit. The energy storage unit housing contains a battery cell, and the top of the battery cell is fixedly connected to the negative electrode cover plate assembly through a negative electrode current collector. The negative electrode cover plate assembly includes a negative electrode post assembly, a first cover plate, a first insulating component, and a second insulating component. The negative electrode post assembly includes an electrode post and a chassis. A second central hole is opened in the center of the chassis. The bottom of the electrode post has a first protrusion. The outer diameter of the first protrusion is slightly larger than the inner diameter of the second central hole of the chassis. The first protrusion is pressed into the second central hole. The two are interference fit, thereby realizing the fixed connection between the electrode post and the chassis. The chassis is fixed to the negative electrode current collector by welding. The first cover plate is sleeved on the outer periphery of the electrode post of the negative electrode post assembly. The first insulating component and the second insulating component are arranged sequentially from top to bottom between the first cover plate and the electrode post for insulation. The corresponding surfaces of the first insulating component and the second insulating component abut against each other. However, in the aforementioned negative electrode lead-out mechanism, the negative electrode post and the chassis serving as the adapter plate are connected by an interference fit, and the negative electrode post assembly and the first cover plate are equipped with a first insulating component and a second insulating component to provide insulation and sealing. This results in a complex structure with many components, leading to low production and assembly efficiency, cumbersome processing and manufacturing of the energy storage capacitor, and high manufacturing costs. Chinese patent document CN210984547U discloses a negative electrode lead-out structure and an energy storage unit. Both the negative electrode adapter plate and the cover plate have central holes. The negative electrode post passes through the central holes of the negative electrode adapter plate and the cover plate and is electrically connected to the negative electrode adapter plate. A sealing ring is provided between the negative electrode post and the cover plate for electrical insulation. An insulating plastic block is fixed to the outer periphery of the negative electrode post, and the lower end face of the insulating plastic block is pressed tightly against the upper end face of the cover plate. A first step is provided on the outer periphery of the negative electrode adapter plate. When the negative electrode adapter plate is welded to the negative current collector, the outer periphery of the first step is inserted into the inner diameter of the flange of the negative current collector. Because of the inclusion of a negative current collector, negative electrode adapter plate, cover plate, and negative electrode post, the connection between these components and the entire negative electrode lead-out structure also suffer from problems such as complex structure, low manufacturing and assembly efficiency, and high cost.

[0004] Therefore, it is urgent to improve the electrode lead-out mechanism of energy storage devices to solve the problems of complex structure and inconvenient assembly and connection between electrode posts, adapter plates, current collectors and cover plates, improve the processing and manufacturing efficiency of energy storage capacitors, and reduce production costs. Utility Model Content

[0005] This invention provides an electrode lead-out structure that directly connects to the top and bottom rivets. This electrode lead-out structure can improve the efficiency of processing and manufacturing, reduce the use of conductive metal materials, reduce manufacturing costs, and improve assembly efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An electrode lead-out structure with direct connection to the top and bottom anchors is disclosed. The electrode lead-out structure includes a current collector and an electrode body. The current collector includes a current collector disc region, a current collector transition region, a current collector cylindrical region, and a current collector top region. The current collector disc region is disc-shaped and used for connection with the battery cell. The current collector cylindrical region is hollow and located in the upper center of the current collector disc region. The current collector transition region is located between the current collector disc region and the current collector cylindrical region for transitional connection between the two regions. The current collector top region is located at the top of the current collector cylindrical region. The electrode body includes an electrode disc region, an electrode transition region, and an electrode cylindrical region. The electrode disc area is roughly annular, and the electrode cylindrical area is a hollow cylinder located in the upper center of the electrode disc area. The electrode transition area is set between the electrode disc area and the electrode cylindrical area for transition connection between the electrode disc area and the electrode cylindrical area. The electrode top area is located at the top of the electrode cylindrical area. The electrode cylindrical area of ​​the electrode body is directly fitted and connected to the outside of the current collector cylindrical area of ​​the current collector, and a concave structure is formed within the range of the electrode cylindrical area of ​​the electrode body and the current collector cylindrical area of ​​the current collector by riveting, so that the electrode body and the current collector are tightly fixed together.

[0008] Furthermore, the electrode cylindrical region of the electrode body and the current collecting cylindrical region of the current collector are interference fit.

[0009] Furthermore, the upper surface of the current collector's top region is in close contact with the lower surface of the electrode top region of the electrode body.

[0010] Furthermore, conductive adhesive is filled between the upper surface of the current collector top region and the lower surface of the electrode top region of the electrode body.

[0011] Furthermore, a reinforcing ring groove is provided on the current collection disk area to enhance its strength.

[0012] Furthermore, the current collector transition region and the electrode transition region are conical.

[0013] Furthermore, the current collector and electrode body are formed by stamping.

[0014] Furthermore, the material for the current collector is copper, and the material for the electrode body is aluminum.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects:

[0016] 1. The electrode lead-out structure of this utility model adopts a direct-connection top and bottom riveting form, with the electrode body and current collector directly formed by stamping, improving processing and manufacturing efficiency. Simultaneously, the hollow electrode cylindrical area and current collector cylindrical area reduce the use of conductive metal materials, lowering manufacturing costs. The electrode body and current collector are fixedly connected together by hollow cylindrical assembly riveting, improving assembly efficiency.

[0017] 2. The top area of ​​the current collector and the top area of ​​the electrode are in direct and close contact, or conductive adhesive is filled between the top areas of the current collector and the top areas of the electrode to ensure the transmission of current.

[0018] 3. The materials of the electrode body and the current collector can be the same or different. The current collector can be made of copper to ensure good conductivity, while the electrode body can be made of aluminum to improve the electrode strength while maintaining conductivity. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the energy storage device of this utility model from the side.

[0021] Figure 2 This is a schematic diagram of the overall structure of the bottom surface of the energy storage device of this utility model;

[0022] Figure 3 This is an overall cross-sectional view of the energy storage device of this utility model;

[0023] Figure 4 This is a schematic diagram of the current collector structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the electrode body of this utility model;

[0025] Figure 6 This is a process flow diagram of the energy storage device of this utility model.

[0026] Figure reference numerals:

[0027] 1. Housing; 11. Process protrusion; 12. Reinforcing fan groove; 13. Reinforcing ring groove; 2. Battery cell; 3. Cover plate; 4. Insulating seal; 5. Current collector; 51. Current collector disc area; 52. Current collector transition area; 53. Current collector cylindrical area; 54. Current collector top area; 6. Electrode body; 61. Electrode disc area; 62. Electrode transition area; 63. Electrode cylindrical area; 64. Electrode top area. Detailed Implementation

[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] 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. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. This utility model can also be implemented or applied through other different specific embodiments, and the 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. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0032] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0033] Meanwhile, the descriptions of orientations in this specification, such as up, down, left, right, front, back, inside, outside, longitudinal, transverse, vertical, and horizontal, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] like Figure 1-3As shown, the energy storage device of this utility model mainly consists of a shell 1, a battery cell 2, a cover plate 3, an insulating sealing element 4, and an electrode lead-out structure. The shell 1 is a barrel-shaped structure with one open end. The battery cell 2 is disposed inside the shell 1, and the cover plate 3 is fixedly connected to the open end of the shell 1. The cover plate 3 has an opening in the center. The electrode lead-out structure is connected to the battery cell 2 and extends out from the opening in the center of the cover plate 3. The insulating sealing element 4 is disposed between the electrode lead-out structure and the opening in the center of the cover plate 3 to insulate the electrode lead-out structure from the cover plate 3 and to seal the opening in the center of the cover plate 3.

[0035] The electrode lead-out structure includes a current collector 5 and an electrode body 6, which are fitted together and fixedly connected by a riveting structure. The current collector 5 is connected to the battery cell; the electrode body 6 is fitted on top of the current collector and fixedly connected to the insulating seal 4, thereby fixing it in the opening in the center of the cover plate 3.

[0036] Figure 4 A schematic diagram of the current collector 5 is shown. The current collector 5 includes a current collector disc region 51, a current collector transition region 52, a current collector cylindrical region 53, and a current collector top region 54. The current collector disc region 51 is disc-shaped and is used to connect with the battery cell. A reinforcing annular groove for strength enhancement is preferably provided on the current collector disc region 51. The current collector cylindrical region 53 is a hollow cylinder located in the upper center of the current collector disc region 51. The current collector transition region 52 is disposed between the current collector disc region 51 and the current collector cylindrical region 53, serving as a transition connection between the two regions. The current collector transition region 52 is preferably conical. The current collector top region 54 is located at the top of the current collector cylindrical region 53.

[0037] Figure 5 A schematic diagram of the electrode body 6 is shown. The electrode body 6 includes an electrode disk region 61, an electrode transition region 62, an electrode cylindrical region 63, and an electrode top region 64. The electrode disk region 61 is generally annular, and the electrode cylindrical region 63 is a hollow cylinder located in the upper center of the electrode disk region 61. The electrode transition region 62 is disposed between the electrode disk region 61 and the electrode cylindrical region 63, serving as a transition connection between the two regions. The electrode transition region 62 is preferably conical. The electrode top region 64 is located at the top of the electrode cylindrical region 63.

[0038] The electrode cylindrical region 63 of the electrode body 6 is directly fitted onto the current collecting cylindrical region 53 of the current collector 5, with an interference fit. A concave structure is formed within the area of ​​both the electrode cylindrical region 63 and the current collecting cylindrical region 53 of the current collector 5 by riveting, thus tightly fixing the electrode body 6 and the current collector 5 together. To ensure current transmission, the current collecting top region 54 is directly and tightly attached to the electrode top region 64, or conductive adhesive is filled between the current collecting top region 54 and the electrode top region 64.

[0039] like Figure 3As shown, the insulating seal 4 completely covers the electrode disk area 61, and at the same time, the insulating seal 4 completely or partially covers the electrode transition area 62 to ensure the insulating seal effect between the insulating seal 4 and the electrode body 6.

[0040] The materials for electrode body 6 and current collector 5 are selected to have good electrical conductivity. The materials for electrode body 6 and current collector 5 can be the same or different. For example, the material for current collector 5 can be copper to ensure good conductivity, while the material for electrode body 6 can be aluminum to improve the strength of the electrode while ensuring conductivity.

[0041] The electrode body 6 and the current collector 5 can be directly formed by stamping, improving manufacturing efficiency. Simultaneously, the inclusion of the electrode cylindrical region 63 and the current collector cylindrical region 53 reduces the use of conductive metal materials, lowering manufacturing costs. The electrode body 6 and the current collector 5 are fixedly connected together by hollow cylindrical fittings and riveting, improving assembly efficiency.

[0042] like Figure 2-3 As shown, preferably, the bottom surface of the energy storage device housing 1 is provided with reinforcing grooves and process protrusions 11. The process protrusions 11 are located in the center of the bottom surface of the housing and can provide support and fixation for the battery cell 2. The reinforcing grooves include reinforcing ring grooves 13 arranged around the periphery of the bottom surface, and a plurality of reinforcing fan grooves 12 arranged between the reinforcing ring grooves 13 and the process protrusions 11. The plurality of reinforcing fan grooves 12 are evenly spaced along the circumferential direction, and the number of reinforcing fan grooves 12 is preferably 5-6.

[0043] Preferably, an injection hole is provided on the cover plate 3; and an explosion-proof plug is provided on the process protrusion 11.

[0044] Figure 6 The specific manufacturing process of the energy storage device of this utility model is given. The manufacturing process of the energy storage device of this utility model includes the following steps:

[0045] Step 1: Preparation of current collector 5 and electrode body 6. Prepare blanks and form current collector 5 and electrode body 6 by stamping.

[0046] Step 2, assembly of current collector 5 and electrode body 6: the electrode body 6 is fitted onto current collector 5, and a concave structure is formed within the electrode cylindrical area 63 of electrode body 6 and the current collecting cylindrical area 53 of current collector 5 by riveting, so that electrode body 6 and current collector 5 are tightly assembled together.

[0047] Step 3: Weld the lower surface of the current collector 5 to the upper surface of the battery cell 2;

[0048] Step 4: Assemble the cover plate 3 onto the upper surface of the electrode body 6 and the current collector 5 and insulate and seal it; specifically: make the electrode cylindrical area 63 of the electrode body 6 pass through the opening in the center of the cover plate 3, keep the cover plate in a fixed position, and perform injection molding in the opening in the center of the cover plate 3, thereby forming an insulating seal 4 between the opening in the center of the cover plate 3 and the electrode disc area 61 of the electrode body 6.

[0049] Step 5: Place the assembly of cell 2, electrode and cover plate 3 into housing 1, and connect cover plate 3 to the upper opening of housing 1.

[0050] Preferably, in step one, a copper blank for current collector 5 is prepared and formed into a copper current collector 5 by stamping, and an aluminum blank for electrode body 6 is prepared and formed into an aluminum electrode body 6 by stamping.

[0051] In step two, before the electrode body 6 is fitted onto the current collector 5, conductive adhesive is applied to the upper surface of the current collector top region 54 of the current collector 5. After the electrode body 6 is fitted onto the current collector 5, the conductive adhesive is evenly distributed between the upper surface of the current collector top region 54 of the current collector 5 and the lower surface of the electrode top region 64 of the electrode body 6, thereby ensuring good conductivity between the current collector 5 and the electrode body 6.

[0052] In step three, the welding between the lower surface of the current collector 6 and the upper surface of the battery cell 2 is laser welding.

[0053] In step four, the injection molding material is selected from one of polypropylene, polystyrene, polycarbonate, and nylon.

[0054] In step five, before placing the assembly of cell 2, electrode and cover plate 3 into housing 1, housing 1 is preheated and expanded before assembly, with the heating temperature between 150 and 200 degrees Celsius. The cover plate 3 is kept flush with the upper opening of housing 1, and the cover plate 3 is connected to housing 1 by laser welding, with a welding penetration of 0.5 to 1.2 mm and a laser spot overlap rate of 60 to 90%.

[0055] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electrode lead-out structure for direct connection to top and bottom anchors, characterized in that: The electrode lead-out structure includes a current collector (5) and an electrode body (6); The current collector (5) includes a current collector disc area (51), a current collector transition area (52), a current collector cylindrical area (53), and a current collector top area (54); the current collector disc area (51) is disc-shaped and is used to connect with the battery cell; the current collector cylindrical area (53) is hollow cylindrical and is located in the upper center of the current collector disc area (51); the current collector transition area (52) is located between the current collector disc area (51) and the current collector cylindrical area (53) for the transition connection between the current collector disc area (51) and the current collector cylindrical area (53); and the current collector top area (54) is located at the top of the current collector cylindrical area (53). The electrode body (6) includes an electrode disk area (61), an electrode transition area (62), an electrode cylindrical area (63), and an electrode top area (64); the electrode disk area (61) is roughly annular, the electrode cylindrical area (63) is a hollow cylinder, and is located in the upper center of the electrode disk area (61); the electrode transition area (62) is disposed between the electrode disk area (61) and the electrode cylindrical area (63) for transition connection between the electrode disk area (61) and the electrode cylindrical area (63), and the electrode top area (64) is located at the top of the electrode cylindrical area (63); The electrode cylindrical region (63) of the electrode body (6) is directly fitted and connected to the outside of the current collecting cylindrical region (53) of the current collector (5), and a concave structure is formed within the range of the electrode cylindrical region (63) of the electrode body (6) and the current collecting cylindrical region (53) of the current collector (5) by riveting, so that the electrode body (6) and the current collector (5) are tightly fixed together.

2. The electrode lead-out structure for direct connection of top and bottom anchors according to claim 1, characterized in that: The electrode cylindrical region (63) of the electrode body (6) and the current collecting cylindrical region (53) of the current collector (5) are interference fit.

3. The electrode lead-out structure for direct connection of top and bottom anchors according to claim 1, characterized in that: The upper surface of the current collector top region (54) of the current collector (5) is in close contact with the lower surface of the electrode top region (64) of the electrode body (6).

4. The electrode lead-out structure for direct connection of top and bottom anchors according to claim 1, characterized in that: Conductive adhesive is filled between the upper surface of the current collector top region (54) of the current collector (5) and the lower surface of the electrode top region (64) of the electrode body (6).

5. The electrode lead-out structure for direct connection of top and bottom anchors according to claim 1, characterized in that: The flow collection disk area (51) is provided with a reinforcing ring groove to enhance strength.

6. The electrode lead-out structure for direct connection of top and bottom anchors according to claim 1, characterized in that: The current collector transition region (52) and the electrode transition region (62) are conical.

7. The electrode lead-out structure for direct connection of top and bottom anchors according to any one of claims 1-6, characterized in that: The current collector (5) and the electrode body (6) are formed by stamping.

8. The electrode lead-out structure for direct connection of top and bottom anchors according to any one of claims 1-6, characterized in that: The material of the current collector (5) is copper, and the material of the electrode body (6) is aluminum.

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