Electrochemical energy storage device

Abstract

To provide an electrochemical energy storage device which has low internal resistance, high strength, and improved anti-vibration performance.SOLUTION: The electrochemical energy storage device comprises: a cover plate (6), which comprises a lead-out column (61) and a fixation plate (62), where the lead-out column (61) is an electric conductor, the fixation plate (62) is an insulator, and the lead-out column (61) is fixed on the fixation plate (62) in a vertically penetrating manner; an outer housing (1), which is cylindrical, where an opening is provided at at least one end of the outer housing, and the fixation plate (62) is connected to the opening of the outer housing (1) in a sealed manner by means of a sealing ring (9); and a roll core (3), which is arranged at an inner cavity of the outer housing (1), where the roll core (3) is welded to a side face of the lead-out column (61) by means of an upper connection piece (4) to achieve electrically conductive connection, and connected in an electrically conductive manner to the other lead-out end of the outer housing (1) by means of a lower connection piece (2).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001]

[0001] The present invention relates to the technical field of electrochemical energy storage devices, and more particularly to electrochemical energy storage devices.

Background Art

[0002]

[0002] A supercapacitor, also called an electrochemical capacitor, is an electrochemical device that stores energy by using a polarizable electrolyte. Supercapacitors have high power density, short charging time, and long life. In the storage systems of electric vehicles and smart grids, this auxiliary energy source has been attracting increasing attention. A structure in which the positive and negative electrodes of the capacitor are arranged at the same end of the outer casing is called a one-end lead-out capacitor. Large and medium-sized capacitors usually adopt a two-end lead-out form. Since the internal resistance of a supercapacitor with a two-end lead-out structure is much lower than that of a one-end lead-out structure, a larger current can be discharged, thereby improving the output performance of the supercapacitor.

[0003]

[0003] Currently, an aluminum cover plate is usually used for the electrodes of a two-end lead-out capacitor, and the external outer casing is also of an aluminum structure. A sealing connection needs to be maintained between the cover plate and the outer casing, and an insulating pad needs to be disposed between the cover plate and the outer casing. However, the cover plate and the outer casing still have a risk of mutual conduction that causes a failure of the entire capacitor.

Summary of the Invention

Problems to be Solved by the Invention

[0004]

[0004] An object of the present invention is to provide an electrochemical energy storage device in which the cover plate has a good insulation effect, and the upper and lower connection pieces are separately welded to the outer casing and the cover plate by a laser, thereby having the advantage of a small internal resistance.

Means for Solving the Problem

[0005]

[0005] To achieve the above object, the following technical solutions are used in the present invention.

[0006] A cover plate comprising a lead-out column and a fixing plate, wherein the lead-out column is a conductor, the fixing plate is an insulator, and the lead-out column penetrates vertically and is fixed to the fixing plate; a cylindrical outer casing, wherein an opening is provided at at least one end of the outer casing, and the fixing plate is sealed by a sealing ring and connected to the opening of the outer casing; a roll core disposed in a cavity inside the outer casing, wherein an upper connection piece is welded to the side surface of the lead-out column to achieve a conductive connection, and a lower connection piece is conductively connected to the other lead-out end of the outer casing; an electrochemical energy storage device comprising a roll core, wherein an upper roll edge used to wrap the roll core is disposed around the upper connection piece, and the periphery of the lead-out column and the upper roll edge of the upper connection piece are fixed by side laser welding.

[0006]

[0007] Furthermore, a lower roll edge used to wrap the roll core is disposed around the lower connection piece, the inner wall of the lower end of the outer casing protrudes inward to form a protrusion, the protrusion is configured to closely fit and position with the lower roll edge of the lower connection piece, a groove is provided on the side wall of the outer casing at a position opposite to the protrusion, and the lower roll edge and the protrusion are fixed and electrically connected by laser penetration welding in the groove.

[0007]

[0008] Furthermore, the cover plate has an annular stepped shape, and the lead-out column is disposed in the center of the fixing plate of the fixing plate.

[0009] Furthermore, the fixed plate has a stepped form that increases from the top to the bottom. The sealing groove is provided in the fixed step, the sealing ring is disposed in the sealing groove, and the insulated fixed plate is sealed by the sealing ring and connected to the opening of the outer casing. The upper end portion of the lead-out column is the first cylinder, the diameter of the first cylinder is smaller than the diameter of the step of the fixed plate, and the upper surface of the first cylinder is higher than the outer surface of the fixed plate. The lower end portion of the lead-out column is the second cylinder, the diameter of the second cylinder is smaller than the outer diameter of the fixed plate, and it is higher than the inner surface of the fixed plate.

[0008]

[0010] Furthermore, the lead-out column is an aluminum column, the fixed plate is a resin plate, and both the upper connection piece and the lower connection piece are aluminum plates.

[0011] Furthermore, the upper positioning hole at the upper roll edge is provided in the center of the upper connection piece, and the lower positioning hole used to penetrate into the central roll pin hole of the roll core to position and fix the lower roll edge of the roll core is provided in the center of the lower connection piece.

[0009]

[0012] Furthermore, a liquid injection hole for injecting electrolyte into the roll core is provided through the lead-out column. The liquid injection hole maintains internal and external insulation sealing by using a sealing element, and the positioning column used to communicate with the liquid injection hole and position it with the upper positioning hole of the upper connection piece is disposed at the center of the inner surface of the lead-out column.

[0010]

[0013] Furthermore, a mounting hole coaxial with the liquid injection hole is provided at one end of the liquid injection hole near the first cylinder. The diameter of the mounting hole is larger than the diameter of the liquid injection hole. A rubber plug and an aluminum plug are continuously disposed in the liquid injection hole. The aluminum plug is fixed to the mounting hole, and the aluminum plug and the first cylinder of the lead-out column are welded by laser.

[0011]

[0014] Furthermore, a plurality of upper through-holes for absorbing the electrolyte by the roll core are provided in the upper connection piece, and a plurality of lower through-holes for absorbing the electrolyte by the roll core are provided in the lower connection piece.

[0012]

[0015] Furthermore, the outer surface of the upper connection piece is covered with a high-temperature resistant insulating heat-shrinkable sleeve, and an enlarged opening for fixing the cover plate is provided at the opening of the outer casing.

Advantages of the Invention

[0013]

[0016] The beneficial effects of the present invention compared with the prior art are as follows.

[0017] 1. The present invention provides an electrochemical energy storage device including a cover plate, an outer casing, and a roll core. The cover plate includes a lead-out column and a fixing plate. The lead-out column is a conductor, the fixing plate is an insulator, and the lead-out column penetrates vertically and is fixed to the fixing plate. The outer casing is cylindrical, an opening is provided at at least one end of the outer casing, and the insulated fixing plate is sealed and connected to the opening of the outer casing. The roll core is disposed in the cavity inside the outer casing. The roll core is electrically conductively connected to the lead-out column by an upper connection piece, and the lower connection piece is electrically conductively connected to the other lead-out end of the outer casing. The roll core is laser welded to the upper and lower connection pieces. The peripheral portion of the lead-out column is fixed to the upper roll edge portion of the upper connection piece by side laser welding, and the lower roll edge portion of the lower connection piece is fixed to the protrusion of the outer casing by a groove by laser penetration welding. This structure ensures a low internal resistance of the product. The upper and lower connection pieces respectively lead out the positive and negative electrodes of the capacitor and lead the positive and negative electrodes to the outside. The cover plate is composed of a lead-out column and a fixing plate, and these are fixed as an integral structure. The lead-out column is insulated from the outer casing by the fixing plate, and no other insulating material is required, thus providing a better insulation effect.

[0014]

[0018] 2. An attachment hole coaxial with the liquid injection hole is provided at one end of the liquid injection hole near the first cylinder. The diameter of the attachment hole is larger than that of the liquid injection hole. A rubber plug and an aluminum plug are continuously arranged in the liquid injection hole. The aluminum plug is fixed to the attachment hole. The first cylinder of the aluminum plug and the lead-out column are welded by a laser. In the design of this structure, the laser welding path avoids the rubber plug during the welding of the aluminum plug so as to avoid damage to the rubber plug, making the welding stronger.

[0015]

[0019] 3. The inner side of the lower end of the outer casing of the present invention protrudes inward to form a protrusion, and the protrusion is configured to fit closely with the lower connection piece. By providing a groove on the surface of the outer casing corresponding to the protrusion, the welding of the outer casing and the lower connection piece is facilitated. The lower connection piece is welded to the inner wall of the outer casing by using this structure instead of the lower surface of the end, resulting in a small internal resistance, high strength, and good stability. When used, the lower connection piece and the outer casing can bring about an improvement in firmness and good vibration resistance performance.

Brief Description of the Drawings

[0016]

Figure 1

[0020] It is an exploded view of the electrochemical energy storage device according to the present invention.

Figure 2

[0021] It is a schematic diagram of the electrochemical energy storage device according to the present invention after installation and setting.

Figure 3

[0022] It is a partially enlarged schematic view of part A in FIG. 2.

Figure 4

[0023] It is a partially enlarged schematic view of part B in FIG. 2.

Figure 5

[0024] It is a schematic diagram of the cover plate of the electrochemical energy storage device according to the present invention.

Figure 6

[0025] It is a schematic diagram of the upper connection piece of the electrochemical energy storage device according to the present invention.

Figure 7

[0026] It is a schematic structural diagram of the upper connection piece of the electrochemical energy storage device according to the present invention.

Figure 8

[0027] It is a schematic structural diagram of the lower connection piece of the electrochemical energy storage device according to the present invention.

Figure 9

[0028] It is a schematic structural diagram of the lower connection piece of the electrochemical energy storage device according to the present invention.

Figure 10

[0029] It is a schematic structural diagram of the outer casing of the electrochemical energy storage device according to the present invention.

Figure 11

[0030] It is a schematic structural diagram of the roll core of the electrochemical energy storage device according to the present invention.

Embodiments for Carrying Out the Invention

[0017]

[0031] Reference numerals: 1 - outer casing, 2 - lower connection piece, 3 - roll core, 4 - upper connection piece, 5 - insulating heat-shrinkable sleeve, 6 - cover plate, 7 - rubber plug, 8 - aluminum plug, 9 - sealing ring, 11 - groove, 12 - protrusion, 13 - enlarged opening, 21 - lower positioning hole, 22 - lower roll edge, 23 - lower through hole, 31 - roll pin hole, 41 - upper positioning hole, 42 - upper roll edge, 43 - upper through hole, 61 - lead-out column, 62 - fixing plate, 611 - liquid injection hole, 612 - positioning column, 613 - mounting hole.

[0018]

[0032] With reference to the embodiments, the present invention will be further described below. The described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments made by those skilled in the art based on the embodiments of the present invention without any inventive work are within the protection scope of the present invention.

[0019]

[0033] Embodiment 1

[0034] As shown in FIGS. 1 to 3, the electrochemical energy storage device includes a cover plate 6 having a lead-out column 61 and a fixing plate 62, where the lead-out column 61 is a conductor, the fixing plate 62 is an insulator, the lead-out column 61 penetrates vertically and is fixed to the fixing plate 62, and the lead-out column 61 has a stud or a light column at its end to facilitate connection between individual elements; a cover plate 6; a cylindrical outer casing 1 having an opening provided at at least one end of the outer casing, and the fixing plate 62 is sealed by a sealing ring and connected to the opening of the outer casing 1; and a roll core 3 disposed in the cavity inside the outer casing 1, which is welded to the side surface of the lead-out column 61 by an upper connection piece 4 to achieve a conductive connection and is conductively connected to the other lead-out end of the outer casing 1 by a lower connection piece 2. As shown in FIGS. 6 and 7, an upper roll edge 42 used to wrap the roll core 3 is disposed around the upper connection piece 4, an upper positioning hole 41 of the upper roll edge 42 is provided at the center of the upper connection piece 4, the roll edge of the upper positioning hole 41 is installed in the hole of the roll core 3, and the peripheral portion of the lead-out column 61 and the upper roll edge 42 of the upper connection piece 4 are fixed by side laser welding.

[0020]

[0035] In this embodiment, the cover plate 6 has an annular step shape, and the lead-out column 61 is disposed at the center of the fixing plate 62. In this embodiment, the lead-out column 61 is an aluminum column, the fixing plate 62 is a resin plate, and both the upper connection piece 4 and the lower connection piece 2 are aluminum plates. The outer casing 1 is also made of an aluminum material.

[0021]

[0036] As shown in FIG. 5, in the present embodiment, the fixed plate 62 has a stepped form that increases from the upper part to the lower part. The sealing groove is provided in the fixed step. The sealing ring 9 is disposed in the sealing groove. The upper end portion of the lead-out column 61 is the first cylinder. The diameter of the first cylinder is smaller than the diameter of the step of the fixed plate 62. The upper surface of the first cylinder is higher than the outer surface of the fixed plate 62. The lower end portion of the lead-out column 61 is the second cylinder. The diameter of the second cylinder is smaller than the outer diameter of the fixed plate 62 and higher than the inner surface of the fixed plate 62. The outer surface of the upper connection piece 4 is covered with a high-temperature resistant insulating heat shrinkable sleeve 5. The insulating heat shrinkable sleeve 5 is connected to the upper connection piece so as to avoid contact between the upper connection piece 4 and the outer casing 1, and covers the welded portion of the lead-out column 61 together. An enlarged opening 13 for fixing the cover plate 6 is provided in the opening of the outer casing 1. The enlarged opening 13 also facilitates the installation of the insulating heat shrinkable sleeve 5.

[0022]

[0037] In the present embodiment, the peripheral portion of the lead-out column 61 and the upper roll edge portion 42 of the upper connection piece 4 are fixed by side laser welding. The welding of this structure is performed at the peripheral portion of the lead-out column 61 instead of using the conventional caulking fit, and has high strength, good stability, low internal resistance, and good vibration resistance performance.

[0023]

[0038] Embodiment 2

[0039] This embodiment is further optimized based on Embodiment 1. In this embodiment, the improvements compared with Embodiment 1 are mainly described. The same content will not be described. In this embodiment, as shown in FIGS. 8 and 9, the lower positioning hole 21 is provided at the center of the lower connection piece 2, the roll edge of the lower positioning hole 21 is installed in the roll pin hole 31 of the roll core, and a lower roll edge 22 for wrapping the roll core 3 is provided at the peripheral part of the lower connection piece 2. As shown in FIGS. 4 and 10, the inner wall of the lower end of the outer casing 1 protrudes inward to form a protrusion 12, and the protrusion is configured to closely fit and be positioned with the lower roll edge 22 of the lower connection piece 2. A groove 11 is provided on the side wall of the outer casing 1 at a position opposite to the protrusion 12, and the lower roll edge 22 and the protrusion 12 are fixed and electrically connected by laser penetration welding in the groove 11.

[0024]

[0040] Inside the lower end of the outer casing 1 in this embodiment, it protrudes inward to form a protrusion 12, and the protrusion is configured to closely fit with the lower connection piece 2. By providing the groove 11 on the surface of the outer casing 1 corresponding to the protrusion 12, the welding of the outer casing 1 and the lower connection piece 2 is facilitated. The lower connection piece 2 is welded to the inner wall of the outer casing 1 by using this structure instead of the lower surface of the end, resulting in a small internal resistance, high strength, and good stability. When used, the lower connection piece 2 and the outer casing 1 can provide improved robustness and good vibration resistance performance. More preferably, the protrusion 12 is an annular protrusion 12, with a larger welding surface, a smaller internal resistance value, a higher welding strength, and better vibration resistance performance. By providing the groove 11, the thickness of the outer casing 1 at the welding part is reduced, the difficulty in the production and manufacturing process is lowered, and the manufacturing is facilitated.

[0025]

[0041] In this embodiment, the upper roll edge 42 of the upper connection piece 4 and the lower roll edge 22 of the lower connection piece 2 respectively cover the roll core 3, the high-temperature resistant insulating heat-shrinkable sleeve 5 of the upper connection piece 4 closely fits with the inner wall of the outer casing 1, and the lower roll edge 22 of the lower connection piece 2 closely fits with the inwardly shrinking annular protrusion 12 of the outer casing 1, so the product has better vibration resistance performance.

[0026]

[0042] Embodiment 3

[0043] As shown in FIG. 3, this embodiment is further optimized based on Embodiment 2. In this embodiment, the improvements compared with Embodiment 2 are mainly described. The same content will not be described. In this embodiment, a liquid injection hole 611 for injecting an electrolyte into the roll core 3 is provided through the lead-out column 61. After the injection of the electrolyte is completed, the liquid injection hole 611 maintains internal and external insulation sealing by using a sealing element, and a positioning column 612 used for positioning with the upper positioning hole 41 of the upper connection piece 4 communicating with the liquid injection hole 611 is disposed at the center of the inner surface of the lead-out column 61. The positioning column 612 facilitates positioning.

[0027]

[0044] Embodiment 4

[0045] As shown in FIG. 3, this embodiment is further optimized based on Embodiment 3. In this embodiment, the improvements compared with Embodiment 3 are mainly described. The same content will not be described. In this embodiment, a mounting hole 613 coaxial with the liquid injection hole 611 is provided at one end of the liquid injection hole 611 near the first cylinder, the diameter of the mounting hole 613 is larger than the diameter of the liquid injection hole 611, a rubber plug 7 and an aluminum plug 8 are continuously disposed in the liquid injection hole 611, the aluminum plug 8 is fixed to the mounting hole 613, and the aluminum plug 8 and the first cylinder of the lead-out column 61 are welded by a laser.

[0028]

[0046] Preferably, a plurality of upper through holes 43 for absorbing the electrolyte by the roll core 3 are provided in the upper connection piece 4, and a plurality of lower through holes 23 for absorbing the electrolyte by the roll core 3 are provided in the lower connection piece 2 to promote the penetration of the electrolyte.

[0029]

[0047] An explosion-proof valve is disposed on the side wall of the outer casing 1 so as to avoid excessive pressure inside the outer casing 1 by using the explosion-proof valve.

[0048] The foregoing description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution, and improvement made within the spirit and principle of the present invention are within the protection scope of the present invention.

Claims

1. The present invention relates to a cover plate (6) having an outlet column (61) and a fixed plate (62), the outlet column (61) being an electrical conductor and the fixed plate (62) being an insulator, the outlet column (61) penetrating vertically and fixed to the fixed plate (62); an outer casing (1) having a cylindrical shape, an opening being provided at at least one end of the outer casing, the fixed plate (62) being sealed by a sealing ring (9) and connected to the opening of the outer casing (1); and a roll core ( and a roll core (3) welded to the side of the outlet column (61) by an upper connection piece (4) to achieve a conductive connection and conductively connected to the other outlet end of the outer casing (1) by a lower connection piece (2), wherein an upper roll edge (42) used to wrap the roll core (3) is arranged on the periphery of the upper connection piece (4), and the periphery of the outlet column (61) and the upper roll edge (42) of the upper connection piece (4) are fixed by side laser welding.

2. 2. The electrochemical energy storage device according to claim 1, wherein a lower roll edge (22) used for wrapping the roll core (3) is arranged on the periphery of the lower connecting piece (2), an inner wall of a lower end of the outer casing (1) protrudes inwardly to form a protrusion (12) configured to closely mate with and be positioned with the lower roll edge (22) of the lower connecting piece (2), a groove (11) is provided in a side wall of the outer casing (1) at a position opposite the protrusion (12), and the lower roll edge (22) and the protrusion (12) are fixed and electrically connected by laser penetration welding in the groove (11).

3. 3. An electrochemical energy storage device according to claim 1 or 2, wherein the cover plate (6) is annularly stepped and the outlet column (61) is arranged centrally on the fixed plate (62).

4. 4. The electrochemical energy storage device according to claim 3, wherein the fixed plate (62) is in the form of a step increasing from top to bottom, a sealing groove is provided in the fixed step, the sealing ring (9) is arranged in the sealing groove, the upper end of the outlet column (61) is a first cylinder, the diameter of which is smaller than the diameter of the step of the fixed plate (62), the upper surface of the first cylinder is higher than the outer surface of the fixed plate (62), and the lower end of the outlet column (61) is a second cylinder, the diameter of which is smaller than the outer diameter of the fixed plate (62) and higher than the inner surface of the fixed plate (62).

5. 4. The electrochemical energy storage device according to claim 3, wherein the outlet column (61) is an aluminum column, the fixed plate (62) is a resin plate, and both the upper connection piece (4) and the lower connection piece (2) are aluminum plates.

6. 4. The electrochemical energy storage device according to claim 3, wherein an upper positioning hole (41) of the upper roll edge (42) is provided in the center of the upper connection piece (4), and a lower positioning hole (21) which penetrates into a central roll pin hole (31) of the roll core (3) and is used to position and fix the lower roll edge (22) of the roll core (3) is provided in the center of the lower connection piece (2).

7. A liquid injection hole (611) for injecting an electrolyte into the roll core (3) is provided through the lead-out column (61), and the liquid injection hole (611) maintains an internal and external insulating seal by using a sealing element, and communicates with the liquid injection hole (611) and the upper 4. The electrochemical energy storage device according to claim 3, wherein a positioning column (612) used for positioning with the upper positioning hole (41) of the side connection piece (4) is arranged in the center of the inner surface of the lead-out column (61).

8. 8. The electrochemical energy storage device according to claim 7, wherein an attachment hole (613) coaxial with the liquid injection hole (611) is provided at one end of the liquid injection hole (611) near the first cylinder, the diameter of the attachment hole (613) is larger than the diameter of the liquid injection hole (611), a rubber plug (7) and an aluminum plug (8) are successively arranged in the liquid injection hole (611), the aluminum plug (8) is fixed in the attachment hole (613), and the aluminum plug (8) and the first cylinder of the outflow column (61) are welded by a laser.

9. 4. The electrochemical energy storage device according to claim 3, wherein the upper connection piece (4) is provided with a plurality of upper through holes (43) for absorbing electrolyte by the roll core (3), and the lower connection piece (2) is provided with a plurality of lower through holes (23) for absorbing the electrolyte by the roll core (3).

10. 4. The electrochemical energy storage device according to claim 3, wherein the outer surface of the upper connection piece (4) is covered with a high-temperature resistant insulating heat-shrink sleeve (5) and the opening of the outer casing (1) is provided with an enlarged opening (13) for fixing the cover plate (6).

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