Direct-connection inward-rolling sealed electrode leading-out structure

Abstract

The utility model relates to a directly-connected and internally-rolled sealed electrode leading-out structure. The electrode leading-out structure comprises a current collecting disc part, a large-diameter cylindrical part, a small-diameter cylindrical part, a rolled edge, a rolled edge groove and a through hole, the current collecting disc part is disc-shaped and is used for collecting current of the battery cell; a large-diameter cylindrical part is arranged in the center of the flow collecting disc part; a small-diameter cylindrical part is arranged in the center of the top of the large-diameter cylindrical part, and the large-diameter cylindrical part and the small-diameter cylindrical part are coaxially arranged; a turned edge surrounding the small-diameter cylindrical part is arranged on the outer ring of the top of the large-diameter cylindrical part; a curled edge groove is formed between the curled edge and the small-diameter cylindrical part; the turned edge is used for abutting against the upper surface of the insulation sealing piece of the energy storage device after being turned up, pressure is applied to the insulation sealing piece, and the sealing effect of the insulation sealing piece is guaranteed. Through the electrode lead-out structure which is directly connected and internally rolled and sealed, the processing and manufacturing efficiency can be improved, the manufacturing cost is reduced, and the assembling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemistry energy storage technical field, concretely relates to a kind of electrode lead-out structure of direct connection inner volume sealing. BACKGROUND

[0002] With the rapid generation and development of new technologies in the field of information technology, electronic products and new energy vehicles, the research and development of energy storage capacitors have been increasingly concerned. Energy storage capacitor is a new type of energy storage device between traditional capacitor and rechargeable battery, which has both large current fast charge and discharge characteristics of capacitor and energy storage characteristics of battery. Its capacity can reach several thousand farad. Compared with traditional capacitors, energy storage capacitors have higher capacity. Compared with batteries, they have the advantages of fast charging speed, high energy density, wide operating temperature range and long cycle life, and are pollution-free to the environment. They are especially suitable for high-frequency, high-power and high-energy charge and discharge application fields, so they have wide market demand in national strategic emerging industries such as rail transit, wind power, public buses, electric vehicles and smart grids.

[0003] The electrode lead-out mechanism of the current energy storage capacitor mainly includes a pole, an adapter disc, a current collector, a cover plate and an insulating sealing element. A Chinese patent document with publication number CN112821015A discloses a copper-aluminum composite pole, a negative cover plate assembly structure and an energy storage unit. The energy storage unit housing is inserted with an electric core. The top end of the electric core is fixedly connected with a negative cover plate assembly through a negative current collector disc. The negative cover plate assembly includes a negative pole assembly, a first cover plate, a first insulating element and a second insulating element. The negative pole assembly includes a pole and a bottom disc. A second center hole is formed in the center of the bottom disc. The pole has a first boss at the bottom. The outer diameter of the first boss is slightly larger than the inner diameter of the second center hole of the bottom disc. The first boss is pressed into the second center hole, and the two are in interference fit, thereby realizing the fixed connection of the pole and the bottom disc. The bottom disc is fixed on the negative current collector disc by welding. The first cover plate is sleeved on the outer periphery of the pole of the negative pole assembly. The first cover plate and the pole are sequentially provided with the first insulating element and the second insulating element from top to bottom for insulation. The corresponding surfaces of the first insulating element and the second insulating element abut against each other. However, in the above-mentioned negative lead-out mechanism, the negative pole and the bottom disc as the adapter disc are connected through interference. The first insulating element and the second insulating element are provided between the negative pole assembly and the first cover plate to play the role of insulation and sealing. The structure is complex, and there are many components, thereby leading to low production and assembly efficiency, complicated energy storage capacitor processing and manufacturing process, and high manufacturing cost. A Chinese patent document with publication number CN210984547U discloses a negative lead-out structure and an energy storage unit. The negative adapter sheet and the cover plate are both provided with a center hole. The negative pole penetrates through the center holes of the negative adapter sheet and the cover plate and is electrically connected with the negative adapter sheet. A sealing ring is arranged between the negative pole and the cover plate for electrical insulation. An insulating plastic block is fixed on the outer periphery of the negative pole. The lower end surface of the insulating plastic block is tightly pressed against the upper end surface of the cover plate. A first step is arranged on the outer periphery surface of the negative adapter sheet. When the negative adapter sheet is welded on 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. Since the negative current collector, the negative adapter sheet, the cover plate, the negative pole and the insulating plastic block are arranged, the connection between these components and the whole negative lead-out structure also have the problems of complex structure, low manufacturing and assembly efficiency and high cost.

[0004] Therefore, it is urgent to improve the electrode lead-out mechanism and processing and manufacturing process of the energy storage device, solve the problems of complex structure, inconvenient assembly and connection between the electrode pole, the adapter disc, the current collector, the cover plate and the insulating sealing element, improve the processing and manufacturing efficiency of the energy storage capacitor and reduce the production cost. Practical new type content

[0005] The utility model provides a kind of electrode lead-out structure of direct connection inner roll seal, which can improve the efficiency of processing and manufacturing, reduce manufacturing cost, and improve assembly efficiency at the same time.

[0006] To achieve the above object, the technical scheme adopted by the utility model is:

[0007] An electrode lead-out structure of direct connection inner rolling sealing, the electrode lead-out structure includes a current collecting disc part, a large-diameter cylindrical part, a small-diameter cylindrical part, a rolling edge, a rolling edge groove and a through hole; the current collecting disc part is disc-shaped and is used for collecting current of the battery cell; the large-diameter cylindrical part is arranged at the central position of the current collecting disc part; the small-diameter cylindrical part is arranged at the top central position of the large-diameter cylindrical part, and the large-diameter cylindrical part and the small-diameter cylindrical part are coaxially arranged; the rolling edge is arranged around the small-diameter cylindrical part at the outer ring of the top of the large-diameter cylindrical part; the rolling edge groove is arranged between the rolling edge and the small-diameter cylindrical part; the rolling edge is used for abutting against the upper surface of the insulating sealing element of the energy storage device after rolling, so as to apply pressure to the insulating sealing element and ensure the sealing effect of the insulating sealing element; the large-diameter cylindrical part and the small-diameter cylindrical part jointly form the electrode of the energy storage device.

[0008] Further, the current collecting disc part, the large-diameter cylindrical part, the small-diameter cylindrical part and the rolling edge are integrally formed.

[0009] Further, the material of the electrode lead-out mechanism is selected to be copper or aluminum with good electrical conductivity.

[0010] Further, the current collecting disc part is separately manufactured, the large-diameter cylindrical part, the small-diameter cylindrical part and the rolling edge are integrally formed, and the large-diameter cylindrical part is fixedly connected to the central position of the current collecting disc part through laser welding.

[0011] Further, the central position of the current collecting disc part is provided with a round hole matched with the large-diameter cylindrical part, the large-diameter cylindrical part is inserted into the round hole at the central position of the current collecting disc part, and then is fixedly connected to the central position of the current collecting disc part through laser welding.

[0012] Further, the material of the current collecting disc part is selected to be copper, and the materials of the large-diameter cylindrical part, the small-diameter cylindrical part and the rolling edge are selected to be aluminum.

[0013] Further, in the initial state before the rolling edge, the outer diameter of the small-diameter cylindrical part is smaller than the outer diameter of the large-diameter cylindrical part, the outer diameter of the rolling edge is larger than the outer diameter of the large-diameter cylindrical part, the inner diameter of the rolling edge is smaller than the outer diameter of the large-diameter cylindrical part, the inner diameter of the rolling edge is larger than the outer diameter of the small-diameter cylindrical part, and the height of the rolling edge is larger than the height of the small-diameter cylindrical part.

[0014] Further, a plurality of through holes are uniformly and intervally arranged around the large-diameter cylindrical part on the current collecting disc part.

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

[0016] 1. The electrode lead-out structure of the utility model adopts the form of direct connection inner rolling sealing, the current collecting disc part, the large-diameter cylindrical part, the small-diameter cylindrical part and the rolling edge are integrally formed, and the efficiency of processing and manufacturing is improved.

[0017] 2. The edge is rolled and abuts against the upper surface of the insulating seal, so that the insulating seal can be pressed to ensure the sealing effect of the insulating seal.

[0018] 3. The current collecting disc part can be manufactured separately, and the large-diameter cylindrical part, the small-diameter cylindrical part and the edge are integrally formed and then fixedly connected through laser welding. The material of the current collecting disc part can be selected as copper to ensure good conductivity, and the materials of the large-diameter cylindrical part, the small-diameter cylindrical part and the edge can be selected as aluminum to improve the strength of the electrode on the basis of ensuring the conductivity. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 is the overall structure schematic diagram of the top view of the energy storage device of the present application;

[0021] Figure 2 is the overall structure schematic diagram of the bottom view of the energy storage device of the present application;

[0022] Figure 3 is the overall cross-sectional view of the energy storage device of the present application;

[0023] Figure 4 is the structure schematic diagram of the electrode lead-out mechanism after the edge of the present application;

[0024] Figure 5 is the cross-sectional view of the electrode lead-out mechanism after the edge of the present application;

[0025] Figure 6 is the structure schematic diagram of the electrode lead-out mechanism before the edge of the present application;

[0026] Figure 7 is the cross-sectional view of the electrode lead-out mechanism before the edge of the present application;

[0027] Figure 8 is the processing and manufacturing process flow chart of the energy storage device of the present application.

[0028] Reference signs in the drawings:

[0029] The shell 1, the process protrusion 11, the reinforcing fan groove 12, the reinforcing ring groove 13, the battery cell 2, the cover plate 3, the insulating seal 4, the electrode lead-out mechanism 5, the current collecting disc part 51, the large-diameter cylindrical part 52, the small-diameter cylindrical part 53, the hem 54, the hem groove 55, and the through hole 56. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below with reference to the drawings.

[0031] The embodiments of the present application will be described in detail below with reference to the drawings.

[0032] It is to be understood that the foregoing description is that of only one example of the application and that numerous changes and modifications will occur to those skilled in the art, without departing from the spirit and scope of the application. It is intended that the scope of the application disclosed herein include all such changes and modifications.

[0033] It is to be understood that the foregoing description is that of only one example of the application and that numerous changes and modifications will occur to those skilled in the art, without departing from the spirit and scope of the application. It is intended that the scope of the application disclosed herein include all such changes and modifications.

[0034] In addition, in the following description, specific details are provided to thoroughly understand examples. However, it will be understood by one of ordinary skill in the art that the examples can be practiced without these specific details.

[0035] 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.

[0036] Example 1

[0037] like Figures 1-3 As 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 5. 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 5 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 5 and the opening in the center of the cover plate 3 to insulate between the electrode lead-out structure 5 and the cover plate 3 and to seal the opening in the center of the cover plate 3.

[0038] like Figures 4-7 As shown, the electrode lead-out structure 5 includes a current-collecting disk portion 51, a large-diameter cylindrical portion 52, a small-diameter cylindrical portion 53, a rolled edge 54, a rolled edge groove 55, and through holes 56. The current-collecting disk portion 51 is disk-shaped and serves to collect the current from the battery cell 2. A large-diameter cylindrical portion 52 is located at the center of the current-collecting disk portion 51, and several through holes 56 are evenly spaced around the large-diameter cylindrical portion 52 along its circumference. The number of through holes 56 is preferably 5-6. A small-diameter cylindrical portion 53 is located at the top center of the large-diameter cylindrical portion 52, and the large-diameter cylindrical portion 52 and the small-diameter cylindrical portion 53 are coaxially arranged. A rolled edge 54 is provided around the outer edge of the top of the large-diameter cylindrical portion 52, surrounding the small-diameter cylindrical portion 53. Figures 6-7 As shown, a curling groove 55 is provided between the curled edge 54 and the small-diameter cylindrical part 53.

[0039] The current collecting disk portion 51, the large-diameter cylindrical portion 52, the small-diameter cylindrical portion 53, and the rolled edge 54 are integrally formed. Preferably, the electrode lead-out structure 5 is formed by stamping and then milling the blank.

[0040] like Figure 3As shown, the current collecting disc part 51 of the electrode lead-out structure 5 is fixedly connected with the battery cell 2 by laser welding. The large-diameter cylindrical part 52 is arranged in the opening in the center of the cover plate 3, the small-diameter cylindrical part 53 and the curled edge 54 extend out of the opening in the center of the cover plate 3, the insulating sealing member 4 is located between the large-diameter cylindrical part 52 and the opening in the center of the cover plate 3, and the curled edge 54 is folded against the upper surface of the insulating sealing member 4 after being curled, so that the insulating sealing member 4 can be pressed to ensure the sealing effect of the insulating sealing member 4. The large-diameter cylindrical part 52 and the small-diameter cylindrical part 53 jointly constitute the electrode of the energy storage device.

[0041] As shown in Figure 7 In the initial state, the outer diameter of the small-diameter cylindrical part 53 is smaller than the outer diameter of the large-diameter cylindrical part 52, the outer diameter of the curled edge 54 is larger than the outer diameter of the large-diameter cylindrical part 52, the inner diameter of the curled edge 54 is smaller than the outer diameter of the large-diameter cylindrical part 52, the inner diameter of the curled edge 54 is larger than the outer diameter of the small-diameter cylindrical part 53, and the height of the curled edge 54 is larger than the height of the small-diameter cylindrical part 53.

[0042] The material of the electrode lead-out structure 5 is selected to be a material with good electrical conductivity, and is preferably copper or aluminum.

[0043] As shown in Figures 2-3 Preferably, the bottom surface of the energy storage device shell 1 is provided with reinforcing grooves and a process protrusion 11, and the process protrusion 11 is arranged in the center of the bottom surface of the shell and can support and fix the battery cell 2. The reinforcing grooves include a reinforcing ring groove 13 arranged around the periphery of the bottom surface and a plurality of reinforcing fan grooves 12 arranged between the reinforcing ring groove 13 and the process protrusion 11, and the plurality of reinforcing fan grooves 12 are uniformly and spacedly arranged in the circumferential direction, and the number of the reinforcing fan grooves 12 is preferably 5-6.

[0044] Preferably, the cover plate 3 is provided with a liquid injection hole, and the process protrusion 11 is provided with an explosion-proof plug.

[0045] Example Two

[0046] The energy storage device in Example Two is different from that in Example One in that the current collecting disc part 51 of the electrode lead-out structure 5 is separately manufactured, and the large-diameter cylindrical part 52, the small-diameter cylindrical part 53 and the curled edge 54 are integrally formed. The central part of the current collecting disc part 51 is a flat plate structure, the large-diameter cylindrical part 52 is fixedly connected to the central part of the current collecting disc part 51 by laser welding, or the central part of the current collecting disc part 51 is provided with a circular hole matched with the large-diameter cylindrical part 52, the large-diameter cylindrical part 52 is inserted into the circular hole in the central part of the current collecting disc part 51, and then is fixedly connected to the central part of the current collecting disc part 51 by laser welding.

[0047] Preferably, the material of the current collecting disc part 51 is copper, and the materials of the large-diameter cylindrical part 52, the small-diameter cylindrical part 53 and the curled edge 54 are aluminum.

[0048] Embodiment three

[0049] Figure 8 The specific processing and manufacturing process of the energy storage device is given.

[0050] Step one, preparation of the electrode lead-out structure 5;

[0051] Step two, welding the lower surface of the current collection disc part 51 of the electrode lead-out structure 5 on the upper surface of the battery cell 2;

[0052] Step three, the cover plate 3 is sleeved on the large-diameter cylindrical part of the electrode lead-out structure 5 through the central opening thereof, and the insulating sealing piece 4 is installed between the large-diameter cylindrical part 52 and the opening in the center of the cover plate 3; or the insulating sealing piece 4 is formed by injection molding;

[0053] Step four, crimping the crimping part 54 of the electrode lead-out structure 5 so as to abut against the upper surface of the insulating sealing piece 4;

[0054] Step five, placing the combination of the battery cell 2, the electrode and the cover plate 3 into the shell 1, and connecting the cover plate 3 and the upper end opening of the shell 1 together.

[0055] Preferably, in step one, the electrode lead-out structure 5 is integrally formed, a blank is prepared first, a semi-finished product with the current collection disc part 51 and the cylindrical part is obtained by stamping forming, then the large-diameter cylindrical part 52, the small-diameter cylindrical part 53 and the crimping part 54 are formed by milling, and the through hole 56 is formed on the current collection disc part 51.

[0056] Alternatively, in step one, the current collection disc part 51 is formed by stamping a copper blank, the large-diameter cylindrical part 52, the small-diameter cylindrical part 53 and the crimping part 54 are formed by milling an aluminum blank, and then the upper surface of the current collection disc part 51 and the lower surface of the large-diameter cylindrical part 52 are fixedly connected together by laser welding.

[0057] Alternatively, in step one, the current collection disc part 51 is formed by stamping a copper blank, and a circular hole cooperating with the large-diameter cylindrical part 52 is formed in the center of the current collection disc part 51, the large-diameter cylindrical part 52, the small-diameter cylindrical part 53 and the crimping part 54 are formed by milling an aluminum blank, and then the bottom end of the large-diameter cylindrical part 52 is inserted into the circular hole in the center of the current collection disc part 51, and the current collection disc part 51 is welded into the circular hole in the center of the current collection disc part 51 by laser welding.

[0058] 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.

[0059] In step four, the material for injection molding is selected from one of polypropylene, polystyrene, polycarbonate and nylon.

[0060] In step five, before the combination of the battery cell 2, the electrode and the cover plate 3 is put into the shell 1, the shell 1 is heated and expanded, and then the assembly is carried out, the heating temperature is between 150-200; the cover plate 3 is kept flush with the upper end opening of the shell 1, and the cover plate 3 and the shell 1 are connected together by laser welding, the welding penetration is 0.5-1.2mm, and the light spot overlapping rate is 60-90%.

[0061] The above merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electrode lead-out structure of a direct connection inner roll seal, characterized in that: The electrode lead-out structure (5) comprises a current collection disc part (51), a large-diameter cylindrical part (52), a small-diameter cylindrical part (53), a rolled edge (54), a rolled edge groove (55), and a through hole (56); the current collection disc part (51) is disc-shaped and is used for current collection of an electric core (2); the central position of the current collection disc part (51) is provided with the large-diameter cylindrical part (52); the top central position of the large-diameter cylindrical part (52) is provided with the small-diameter cylindrical part (53), and the large-diameter cylindrical part (52) and the small-diameter cylindrical part (53) are coaxially arranged; the outer ring of the top of the large-diameter cylindrical part (52) is provided with the rolled edge (54) surrounding the small-diameter cylindrical part (53); and the rolled edge groove (55) is arranged between the rolled edge (54) and the small-diameter cylindrical part (53). The rolled edge (54) is used for rolling against the upper surface of an insulating seal (4) of an energy storage device after rolling, for applying pressure to the insulating seal (4), and for ensuring the sealing effect of the insulating seal (4). The large-diameter cylindrical part (52) and the small-diameter cylindrical part (53) jointly constitute an electrode of the energy storage device.

2. The direct-attach, inside-rolled seal electrode lead-through structure of claim 1, wherein: The current collection disc part (51), the large-diameter cylindrical part (52), the small-diameter cylindrical part (53), and the rolled edge (54) are integrally formed.

3. The direct-attach, inside-pinch sealed electrode lead-through of claim 2, wherein: The material of the electrode lead-out structure (5) is selected to be copper or aluminum.

4. The direct-attach, inside- crimp sealed electrode lead-through structure of claim 1, wherein: The current collection disc part (51) is separately manufactured, and the large-diameter cylindrical part (52), the small-diameter cylindrical part (53), and the rolled edge (54) are integrally formed; the large-diameter cylindrical part (52) is fixedly connected to the central position of the current collection disc part (51) through laser welding.

5. The direct-attach, inside-pinch sealed electrode lead-through of claim 4, wherein: The central position of the current collection disc part (51) is provided with a round hole matched with the large-diameter cylindrical part (52), the large-diameter cylindrical part (52) is inserted into the round hole at the central position of the current collection disc part (51), and then is fixedly connected to the central position of the current collection disc part (51) through laser welding.

6. The direct-attached inner-pinch sealed electrode feedthrough of claim 4 or 5, wherein: The material of the current collection disc part (51) is selected to be copper, and the materials of the large-diameter cylindrical part (52), the small-diameter cylindrical part (53), and the rolled edge (54) are selected to be aluminum.

7. The direct-attach, inside- crimp sealed electrode lead-through structure of claim 1, wherein: In an initial state before rolling, the outer diameter of the small-diameter cylindrical part (53) is smaller than the outer diameter of the large-diameter cylindrical part (52), the outer diameter of the rolled edge (54) is greater than the outer diameter of the large-diameter cylindrical part (52), the inner diameter of the rolled edge (54) is smaller than the outer diameter of the large-diameter cylindrical part (52), the inner diameter of the rolled edge (54) is greater than the outer diameter of the small-diameter cylindrical part (53), and the height of the rolled edge (54) is greater than the height of the small-diameter cylindrical part (53).

8. The direct-attach, inside- crimp sealed electrode lead-through structure of claim 1, wherein: The current collection disc part (51) is provided with a plurality of through holes (56) uniformly and spaced apart along the circumference around the large-diameter cylindrical part (52).

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