Energy storage device and processing and manufacturing process thereof

Abstract

The invention relates to an energy storage device and a processing and manufacturing process thereof.The energy storage device comprises a shell, a battery cell, a cover plate, an insulation sealing piece and an electrode leading-out structure, the electrode leading-out structure is a directly-connected top-bottom upsetting and riveting electrode leading-out structure, and 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] The present invention relates to the technical field of electrochemical energy storage, and in particular to an energy storage device and a processing and manufacturing process thereof. Background Art

[0002] With the rapid emergence and development of new technologies in the fields of information technology, electronic products and new energy vehicles, the research and development of energy storage capacitors has received more and more attention. Energy storage capacitors are a new type of energy storage device between traditional capacitors and rechargeable batteries. They have both the large current fast charging and discharging characteristics of capacitors and the energy storage characteristics of batteries. Their capacity can reach several thousand farads. Compared with traditional capacitors, energy storage capacitors have higher capacity, and compared with batteries, they have the advantages of fast charging speed, high energy density, wide operating temperature range and long cycle life, and they are pollution-free to the environment. They are especially suitable for high-frequency, high-power and high-energy charging and discharging applications. Therefore, they have a wide market demand in national strategic emerging industries such as rail transit, wind power generation, public buses, electric vehicles, and smart grids.

[0003] At present, the electrode lead-out mechanism of the energy storage capacitor mainly includes a pole, a transfer plate, a current collector and a cover plate. For example, a Chinese patent document with publication number CN112821015A discloses a copper-aluminum composite pole, negative electrode cover plate assembly structure and energy storage unit, wherein a battery cell is inserted into the shell of the energy storage unit, and the top of the battery cell is fixedly connected to the negative electrode cover plate assembly through the negative electrode collector plate, and the negative electrode cover plate assembly includes a negative pole assembly, a first cover plate, a first insulating member, and a second insulating member; the negative pole assembly includes a pole and a chassis, a second center hole is opened in the center of the chassis, and a first boss is provided at the bottom of the pole, the outer diameter of the first boss is slightly larger than the inner diameter of the second center hole of the chassis, the first boss is pressed into the second center hole, and the two are interference fit, thereby realizing a fixed connection between the pole and the chassis, and the chassis is fixed to the negative electrode collector plate by welding; the first cover plate is sleeved on the outer periphery of the pole of the negative pole assembly, and a first insulating member and a second insulating member are sequentially arranged between the first cover plate and the pole from top to bottom for insulation, and the corresponding surfaces of the first insulating member and the second insulating member abut against each other. However, in the above-mentioned negative electrode lead-out mechanism, the negative electrode column and the chassis as the adapter plate are connected by interference fit, and the negative electrode column assembly and the first cover plate are provided with a first insulating member and a second insulating member to play the role of insulation and sealing. The structure is complex and there are many parts, which leads to low production and assembly efficiency, cumbersome processing and manufacturing process of energy storage capacitors, and high manufacturing cost. The Chinese patent document with announcement number CN210984547U discloses a negative electrode lead-out structure and an energy storage monomer, wherein the negative electrode adapter plate and the cover plate are both provided with a central hole, and the negative electrode column passes through the central hole 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 column and the cover plate for electrical insulation; an insulating plastic block is fixed to the outer periphery of the negative electrode column, and the lower end face of the insulating plastic block is pressed against the upper end face of the cover plate; a first step is provided on the outer periphery of the negative electrode adapter plate, and 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. Due to the provision of a negative current collector, a negative electrode adapter, a cover plate, and a negative electrode pole, the connection between these components and the entire negative electrode 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 of the energy storage device and its processing and manufacturing process, to solve the problems of complex structure and inconvenient assembly and connection between the electrode poles, adapter plates, current collectors and cover plates, to improve the processing and manufacturing efficiency of the energy storage capacitor and reduce production costs. Summary of the invention

[0005] The present invention provides an energy storage device and a processing and manufacturing process thereof, which can improve the processing and manufacturing efficiency, reduce the use of conductive metal materials, reduce the manufacturing cost, and improve the assembly efficiency through an electrode lead-out structure directly connected to the top and bottom pier rivets.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] Furthermore, the electrode cylindrical region of the electrode body and the current collecting cylindrical region of the current collector are in interference fit.

[0008] Furthermore, the upper surface of the current collector top region of the current collector is in close contact with the lower surface of the electrode top region of the electrode body.

[0009] Furthermore, a conductive glue is filled between the upper surface of the current collector top region of the current collector and the lower surface of the electrode top region of the electrode body.

[0010] Furthermore, a reinforcing ring groove for enhancing strength is provided on the collecting disc area.

[0011] Furthermore, the current collecting transition region and the electrode transition region are conical.

[0012] Furthermore, the current collector and the electrode body are formed by stamping.

[0013] Furthermore, the material of the current collector is copper, and the material of the electrode body is aluminum.

[0014] An energy storage device comprises a shell, a battery cell, a cover plate, an insulating seal and an electrode lead-out structure, wherein the shell is a barrel-shaped structure with an opening at one end, the battery cell is arranged in the shell, and the cover plate is fixedly connected to the open end of the shell; an opening is arranged in the center of the cover plate, the electrode lead-out structure is connected to the battery cell and extends out from the opening in the center of the cover plate, and the insulating seal is arranged between the electrode lead-out structure and the opening in the center of the cover plate, and is used to insulate the electrode lead-out structure and the cover plate, and to seal the opening in the center of the cover plate; the electrode lead-out structure is an electrode lead-out structure directly connected to the top and bottom pier rivets, and the electrode lead-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; the current collecting disc area is disc-shaped and is used to be connected to the battery cell, and the current collecting cylindrical area is a hollow cylindrical area, located in the central upper part of the current collecting disc area ; The current collecting transition zone is arranged between the current collecting disk zone and the current collecting cylindrical zone, and is used for the transition connection between the current collecting disk zone and the current collecting cylindrical zone, and the current collecting top zone is located at the top of the current collecting cylindrical zone; the electrode body includes an electrode disk zone, an electrode transition zone, an electrode cylindrical zone and an electrode top zone; the electrode disk zone is roughly annular, and the electrode cylindrical zone is a hollow cylindrical zone, which is located in the central upper part of the electrode disk zone; the electrode transition zone is arranged between the electrode disk zone and the electrode cylindrical zone, and is used for the transition connection between the electrode disk zone and the electrode cylindrical zone, and the electrode top zone is located at the top of the electrode cylindrical zone; the electrode cylindrical zone of the electrode body is directly fitted and connected to the outside of the current collecting cylindrical zone of the current collector, and a circle of concave structure is formed within the electrode cylindrical zone of the electrode body and the current collecting cylindrical zone of the current collector by riveting, so that the electrode body and the current collector are tightly fixed together.

[0015] Preferably, the material of the current collector is copper, and the material of the electrode body is aluminum; the current collector and the electrode body are formed by stamping; the electrode cylindrical region of the electrode body and the current collecting cylindrical region of the current collector are interference fit.

[0016] Preferably, the upper surface of the current collector top region of the current collector is in close contact with the lower surface of the electrode top region of the electrode body; or a conductive glue is filled between the upper surface of the current collector top region of the current collector and the lower surface of the electrode top region of the electrode body.

[0017] Preferably, a reinforcing ring groove for enhancing strength is provided on the current collecting disc area; and the current collecting transition area and the electrode transition area are conical.

[0018] Preferably, the bottom surface of the energy storage device shell is provided with a reinforcement groove and a process protrusion, and the process protrusion is arranged in the center of the bottom surface of the shell to support and fix the battery cell; the reinforcement groove includes a reinforcement ring groove arranged in a circle around the outer periphery of the bottom surface, and a plurality of reinforcement fan grooves arranged between the reinforcement ring groove and the process protrusion, and the plurality of reinforcement fan grooves are evenly spaced along the circumferential direction.

[0019] A processing and manufacturing process for an energy storage device comprises the following steps: step 1, preparation of a current collector and an electrode body, preparing a blank, and forming the current collector and the electrode body by stamping; step 2, assembly of the current collector and the electrode body, sleeve the electrode body on the current collector, and form a circle of concave structure within the electrode cylindrical region of the electrode body and the current collecting cylindrical region of the current collector by riveting, so that the electrode body and the current collector are tightly assembled together; step 3, welding the lower surface of the current collector to the upper surface of the battery cell; step 4, assembling a cover plate to the upper surface of the electrode body and the current collector and insulating and sealing them; specifically, the electrode cylindrical region of the electrode body passes through the opening in the center of the cover plate, the position of the cover plate is kept fixed, and injection molding is performed at the opening in the center of the cover plate, so that an insulating seal is formed between the opening in the center of the cover plate and the electrode disc region of the electrode body; step 5, placing the assembly of the battery cell, the electrode and the cover plate into a shell, and connecting the cover plate to the upper end opening of the shell.

[0020] Preferably, before the electrode body is mounted on the current collector, a conductive glue is coated on the upper surface of the current collector top area of ​​the current collector. After the electrode body is mounted on the current collector, the conductive glue is evenly distributed between the upper surface of the current collector top area of ​​the current collector and the lower surface of the electrode top area of ​​the electrode body, thereby ensuring good conductive properties between the current collector and the electrode body.

[0021] Preferably, the welding between the lower surface of the current collector and the upper surface of the battery cell is laser welding.

[0022] Preferably, the injection molding material is selected from one of polypropylene, polystyrene, polycarbonate and nylon.

[0023] Preferably, before placing the assembly of the battery cell, electrode and cover plate into the shell, the shell is preheated and expanded before assembly, and the heating temperature is between 150 and 200 degrees Celsius; the cover plate is kept flush with the upper end opening of the shell, and the cover plate and the shell are connected together by laser welding, the welding depth is 0.5 to 1.2 mm, and the spot overlap rate is 60 to 90%.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects:

[0025] The electrode lead-out structure of the energy storage device of the present invention adopts the form of direct top and bottom riveting, and the electrode body and the current collector are directly formed by stamping, which improves the efficiency of processing and manufacturing. At the same time, due to the setting of the hollow electrode cylindrical area and the current collector cylindrical area, the use of conductive metal materials can be reduced, and the manufacturing cost can be reduced. The electrode body and the current collector are fixedly connected together by the hollow cylindrical set riveting, which improves the assembly efficiency.

[0026] The current collecting top region and the electrode top region are directly and closely attached to each other, or the current collecting top region and the electrode top region are filled with conductive glue, so that the transmission of current can be ensured.

[0027] 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 electrical conductivity, and the electrode body can be made of aluminum to improve the strength of the electrode while ensuring electrical conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the energy storage device of the present invention from the side;

[0030] Figure 2 It is a schematic diagram of the overall structure of the bottom surface of the energy storage device of the present invention;

[0031] Figure 3 is an overall cross-sectional view of the energy storage device of the present invention;

[0032] Figure 4 is a schematic structural diagram of the current collector of the present invention;

[0033] Figure 5 It is a schematic structural diagram of the electrode body of the present invention;

[0034] Figure 6It is a process flow chart of the processing and manufacturing process of the energy storage device of the present invention.

[0035] Reference numerals in the figures:

[0036] Shell 1, process protrusion 11, reinforcement fan groove 12, reinforcement ring groove 13, battery cell 2, cover plate 3, insulating seal 4, current collector 5, current collecting disk area 51, current collecting transition area 52, current collecting cylindrical area 53, current collecting top area 54, electrode body 6, electrode disk area 61, electrode transition area 62, electrode cylindrical area 63, electrode top area 64. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0039] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an 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 aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0040] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0041] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0042] At the same time, in this specification, descriptions involving orientations, such as up, down, left, right, front, back, inside, outside, longitudinal, lateral, vertical, horizontal, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] like Figure 1-3 As shown, the energy storage device of the present invention is mainly composed of a shell 1, a battery cell 2, a cover plate 3, an insulating seal 4 and an electrode lead-out structure, wherein the shell 1 is a barrel-shaped structure with an opening at one end, the battery cell 2 is arranged in the shell 1, and the cover plate 3 is fixedly connected to the open end of the shell 1. An opening is provided in the center of the cover plate 3, 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, and the insulating seal 4 is arranged between the electrode lead-out structure and the opening in the center of the cover plate 3, and is used to insulate the electrode lead-out structure and the cover plate 3, and to seal the opening in the center of the cover plate 3.

[0044] The electrode lead-out structure includes a current collector 5 and an electrode body 6, which are sheathed together and fixedly connected together by a riveting structure. The current collector 5 is connected to the battery cell; the electrode body 6 is sheathed on the top of the current collector and fixedly connected to the insulating seal 4 so as to be fixed in the opening in the center of the cover plate 3.

[0045] Figure 4 The schematic diagram of the structure of the current collector 5 is shown, and the current collector 5 includes a current collecting disc area 51, a current collecting transition area 52, a current collecting cylindrical area 53 and a current collecting top area 54. The current collecting disc area 51 is disc-shaped and is used to connect with the battery cell. The current collecting disc area 51 is preferably provided with a reinforcing ring groove for enhancing strength. The current collecting cylindrical area 53 is a hollow cylindrical shape and is located in the central upper part of the current collecting disc area 51. The current collecting transition area 52 is arranged between the current collecting disc area 51 and the current collecting cylindrical area 53, and is used for the transition connection between the current collecting disc area 51 and the current collecting cylindrical area 53. The current collecting transition area 52 is preferably conical. The current collecting top area 54 is located at the top of the current collecting cylindrical area 53.

[0046] Figure 5The schematic diagram of the structure of the electrode body 6 is shown, and 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, and the electrode cylindrical area 63 is a hollow cylindrical area, located in the central upper part of the electrode disk area 61. The electrode transition area 62 is arranged between the electrode disk area 61 and the electrode cylindrical area 63, and is used for the transition connection between the electrode disk area 61 and the electrode cylindrical area 63. The electrode transition area 52 is preferably conical. The electrode top area 64 is located at the top of the electrode cylindrical area 63.

[0047] 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 the two are interference fit, and a circle of concave structure is formed within 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. In order to ensure the transmission of current, the current collecting top region 54 and the electrode top region 64 are directly and tightly attached, or the current collecting top region 54 and the electrode top region 64 are filled with conductive glue.

[0048] like Figure 3 As shown, the insulating seal 4 completely wraps the electrode disk area 61 , and the insulating seal 4 completely or partially wraps the electrode transition area 62 , so as to ensure the insulating sealing effect between the insulating seal 4 and the electrode body 6 .

[0049] The materials of the electrode body 6 and the current collector 5 are selected to be materials with good electrical conductivity, and the materials of the electrode body 6 and the current collector 5 can be selected to be the same or different. For example, the material of the current collector 5 can be selected to be copper to ensure good electrical conductivity, and the material of the electrode body 6 can be selected to be aluminum to improve the strength of the electrode while ensuring electrical conductivity.

[0050] The electrode body 6 and the current collector 5 can be directly formed by stamping, which improves the efficiency of processing and manufacturing. At the same time, due to the arrangement of the electrode cylindrical area 63 and the current collector cylindrical area 53, the use of conductive metal materials can be reduced, reducing the manufacturing cost. The electrode body 6 and the current collector 5 are fixedly connected together by riveting the hollow cylindrical sleeve, which improves the assembly efficiency.

[0051] like Figure 2-3 As shown, preferably, the bottom surface of the energy storage device housing 1 is provided with a reinforcement groove and a process protrusion 11, and the process protrusion 11 is arranged in the center of the bottom surface of the housing, which can support and fix the battery cell 2. The reinforcement groove includes a reinforcement ring groove 13 arranged in a circle around the bottom surface, and a plurality of reinforcement fan grooves 12 arranged between the reinforcement ring groove 13 and the process protrusion 11, and the plurality of reinforcement fan grooves 12 are evenly spaced along the circumferential direction, and the number of the reinforcement fan grooves 12 is preferably 5-6.

[0052] Preferably, a liquid injection hole is provided on the cover plate 3 ; and an explosion-proof plug is provided on the process protrusion 11 .

[0053] Figure 6 The specific manufacturing process of the energy storage device of the present invention is given. The manufacturing process of the energy storage device of the present invention includes the following steps:

[0054] Step 1: Preparation of the current collector 5 and the electrode body 6: preparing a blank, and forming the current collector 5 and the electrode body 6 by stamping;

[0055] Step 2: Assembling the current collector 5 and the electrode body 6: The electrode body 6 is mounted on the current collector 5, and a circle of concave structure is formed within 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 assembled together;

[0056] Step 3, welding the lower surface of the current collector 5 to the upper surface of the battery cell 2;

[0057] Step 4: Assemble the cover plate 3 to the upper surface of the electrode body 6 and the current collector 5 and insulate and seal them; 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 position of the cover plate fixed, and perform injection molding in the opening in the center of the cover plate 3, so as to form 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;

[0058] Step five: put the assembly of the battery cell 2 , the electrode and the cover plate 3 into the housing 1 , and connect the cover plate 3 to the upper opening of the housing 1 .

[0059] Preferably, in step 1, a copper blank of the current collector 5 is prepared, and the copper current collector 5 is formed by stamping, and an aluminum blank of the electrode body 6 is prepared, and the aluminum electrode body 6 is formed by stamping.

[0060] In step 2, before the electrode body 6 is mounted on the current collector 5, a conductive glue is applied on the upper surface of the current collector top area 54 of the current collector 5. After the electrode body 6 is mounted on the current collector 5, the conductive glue is evenly distributed between the upper surface of the current collector top area 54 of the current collector 5 and the lower surface of the electrode top area 64 of the electrode body 6, thereby ensuring good conductive properties between the current collector 5 and the electrode body 6.

[0061] In step three, the welding between the lower surface of the current collector 5 and the upper surface of the battery cell 2 is laser welding.

[0062] In step 4, the material for injection molding is selected from one of polypropylene, polystyrene, polycarbonate, and nylon.

[0063] In step five, before placing the assembly of the battery cell 2, the electrode and the cover plate 3 into the shell 1, the shell 1 is pre-heated and expanded before assembly, and the heating temperature is between 150 and 200 degrees Celsius; 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, with a welding penetration of 0.5 to 1.2 mm and a spot overlap rate of 60 to 90%.

[0064] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An energy storage device, comprising a shell (1), a battery cell (2), a cover plate (3), an insulating seal (4) and an electrode lead-out structure, wherein the shell (1) is a barrel-shaped structure with one end open, the battery cell (2) is arranged in the shell (1), and the cover plate (3) is fixedly connected to the open end of the shell (1); an opening is arranged in the center of the cover plate (3), 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), and the insulating seal (4) is arranged 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); characterized in that: The electrode lead-out structure is an electrode lead-out structure directly connected to the top and bottom pier rivets; Wherein, the electrode lead-out structure comprises a current collector (5) and an electrode body (6); The current collector (5) comprises a current collecting disc region (51), a current collecting transition region (52), a current collecting cylindrical region (53) and a current collecting top region (54); the current collecting disc region (51) is disc-shaped and used for connecting with the battery core, and the current collecting cylindrical region (53) is hollow cylindrical and is located at the central upper part of the current collecting disc region (51); the current collecting transition region (52) is arranged between the current collecting disc region (51) and the current collecting cylindrical region (53) and is used for transition connection between the current collecting disc region (51) and the current collecting cylindrical region (53), and the current collecting top region (54) is located at the top of the current collecting cylindrical region (53); The electrode body (6) comprises 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 roughly annular, and the electrode cylindrical region (63) is hollow cylindrical and is located in the central upper part of the electrode disk region (61); the electrode transition region (62) is arranged between the electrode disk region (61) and the electrode cylindrical region (63) and is used for transition connection between the electrode disk region (61) and the electrode cylindrical region (63); the electrode top region (64) is located at the top of the electrode cylindrical region (63); The electrode cylindrical region (63) of the electrode body (6) is directly mounted and connected to the outside of the current collecting cylindrical region (53) of the current collector (5), and a circle of concave structure is formed within 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. An energy storage device according to claim 1, characterized in that: The material of the current collector (5) is copper, and the material of the electrode body (6) is aluminum; the current collector (5) and the electrode body (6) are formed by stamping; 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. An energy storage device 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); or a conductive glue 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).

4. An energy storage device according to claim 1, characterized in that: A reinforcing ring groove for reinforcing strength is provided on the current collecting disc area (51); the current collecting transition area (52) and the electrode transition area (62) are conical.

5. An energy storage device according to any one of claims 1 to 4, characterized in that: The bottom surface of the energy storage device housing (1) is provided with a reinforcement groove and a process protrusion (11); the process protrusion (11) is arranged at the center of the bottom surface of the housing to support and fix the battery cell (2); the reinforcement groove comprises a reinforcement ring groove (13) arranged around the outer periphery of the bottom surface, and a plurality of reinforcement fan grooves (12) arranged between the reinforcement ring groove (13) and the process protrusion (11); the plurality of reinforcement fan grooves (12) are evenly spaced along the circumferential direction.

6. A manufacturing process for the energy storage device according to claim 1, characterized in that: The steps include: Step 1: Preparation of the current collector (5) and the electrode body (6): preparing a blank, and forming the current collector (5) and the electrode body (6) by stamping; Step 2: assembling the current collector (5) and the electrode body (6): the electrode body (6) is mounted on the current collector (5), and a circle of concave structure is formed within 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 assembled together; Step 3, welding the lower surface of the current collector (5) to the upper surface of the battery cell (2); 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 them; specifically: allow the electrode cylindrical region (63) of the electrode body (6) to pass through the central opening of the cover plate (3), keep the position of the cover plate fixed, and perform injection molding at the central opening of the cover plate (3), thereby forming an insulating seal (4) between the central opening of the cover plate (3) and the electrode disc region (61) of the electrode body (6); Step five: Place the assembly of the battery cell (2), the electrode and the cover plate (3) into the housing (1), and connect the cover plate (3) to the upper opening of the housing (1).

7. The manufacturing process of the energy storage device according to claim 6, characterized in that: Before the electrode body (6) is mounted on the current collector (5), a conductive glue is coated on the upper surface of the current collector top region (54) of the current collector (5); after the electrode body (6) is mounted on the current collector (5), the conductive glue 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 conductive properties between the current collector (5) and the electrode body (6).

8. The manufacturing process of the energy storage device according to claim 6, characterized in that: The welding between the lower surface of the current collector (5) and the upper surface of the battery core (2) is laser welding.

9. The manufacturing process of the energy storage device according to claim 6, characterized in that: The material selected for injection molding is one of polypropylene, polystyrene, polycarbonate, and nylon.

10. The manufacturing process of the energy storage device according to claim 6, characterized in that: Before placing the assembly of the battery core (2), the electrode and the cover plate (3) into the shell (1), the shell (1) is preheated to expand before assembly, the heating temperature being between 150°C and 200°C; the upper openings of the cover plate (3) and the shell (1) are kept flush, and the cover plate (3) and the shell (1) are connected together by laser welding, the welding penetration is 0.5 to 1.2 mm, and the spot overlap rate is 60 to 90%.

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