Electrochemical Energy Storage Devices

Abstract

An electrochemical energy storage device is disclosed, which belongs to the technical field of electrochemical energy storage devices. The electrochemical energy storage device includes a cover plate (6) having a lead-out column (61) and a fixed plate (62), where the lead-out column (61) is a conductor and the fixed plate (62) is an insulator, and the lead-out column (61) passes through the cover plate (6) from top to bottom and is fixed to the fixed plate (62), a cylindrical outer casing (1) having an opening at at least one end of the outer casing, and the fixed plate (62) is connected to the opening of the outer casing (1) by being sealed with a sealing ring (9); and a roll core (3) disposed in the inner cavity of the outer casing (1), the roll core (3) being welded to the side of the discharge column (61) by an upper connecting piece (4) to achieve a conductive connection, and being conductively connected to the other discharge end of the outer casing (1) by a lower connecting piece (2), the roll core (3) having an upper roll edge (42) used to wrap the roll core (3) disposed on the periphery of the upper connecting piece (4), and the periphery of the discharge column (61) and the upper roll edge (42) of the upper connecting piece (4) being fixed by side laser welding. The electrochemical energy storage device has the advantages of low internal resistance, high strength, good stability, and vibration resistance that can be improved during use.

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 technology]

[0002]

[0002] A supercapacitor, also known as an electrochemical capacitor, is an electrochemical element that stores energy by using a polarizable electrolyte. Supercapacitors have high power density, short charging times, and long lifespans. This auxiliary energy source is attracting increasing attention in the storage systems of electric vehicles and smart grids. A structure in which the positive and negative electrodes of a capacitor are located 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 configuration. 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, allowing for larger current discharge, thereby improving the output performance of the supercapacitor.

[0003]

[0003] Currently, aluminum cover plates are typically used for the electrodes of double-sided leaded capacitors, and the external housing is also made of aluminum. A sealed connection must be maintained between the cover plate and the housing, and an insulating pad must be disposed between the cover plate and the housing. However, the cover plate and the housing still face the risk of mutual conduction, which can cause total capacitor failure. Summary of the Invention [Problem to be solved by the invention]

[0004]

[0004] The object of the present invention is to provide an electrochemical energy storage device in which the cover plate has good insulating effect and the upper and lower connecting pieces are separately welded to the outer casing and cover plate by a laser, thereby having the advantage of low internal resistance. [Means for solving the problem]

[0005]

[0005] In order to achieve the above objectives, the following technical solutions are used in the present invention:

[0006] 1. An electrochemical energy storage device comprising: a cover plate having an outlet column and a fixing plate, wherein the outlet column is an electrical conductor and the fixing plate is an insulator, and the cover plate has the outlet column passing through it from top to bottom and fixed to the fixing plate; a cylindrical outer casing having an opening at at least one end of the outer casing, the fixing plate being sealed by a sealing ring and connected to the opening of the outer casing; and a roll core disposed in a cavity inside the outer casing, the roll core being welded to a side of the outlet column by an upper connecting piece to achieve a conductive connection and being connected to the other outlet end of the outer casing by a lower connecting piece, wherein an upper roll edge used to wrap the roll core is disposed on a periphery of the upper connecting piece, and the periphery of the outlet column and the upper roll edge of the upper connecting piece are fixed by side laser welding.

[0006]

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

[0007]

[0008] Furthermore, the cover plate has an annular stepped shape, and the outlet column is disposed in the center of the fixed plate.

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

[0008]

[0010] Furthermore, the outlet column is an aluminum column, the fixed plate is a resin plate, and both the upper connecting piece and the lower connecting piece are aluminum plates.

[0011] Furthermore, an upper positioning hole of the upper roll edge is provided in the center of the upper connecting piece, and a lower positioning hole that penetrates into the central roll pin hole of the roll core and is used to position and fix the lower roll edge of the roll core is provided in the center of the lower connecting piece.

[0009]

[0012] Furthermore, a liquid injection hole for injecting electrolyte into the roll core is provided through the discharge column, and the liquid injection hole maintains an internal and external insulating seal by using a sealing element. A positioning column that communicates with the liquid injection hole and is used to position with the upper positioning hole of the upper connecting piece is disposed in the center of the inner surface of the discharge column.

[0010]

[0013] Furthermore, 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 the diameter of the liquid injection hole, a rubber plug and an aluminum plug are successively arranged in the liquid injection hole, the aluminum plug is fixed to the attachment hole, and the aluminum plug and the first cylinder of the discharge column are welded by a laser.

[0011]

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

[0012]

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

[0013]

[0016] The advantageous effects of the present invention compared to the prior art are as follows:

[0017] 1. The present invention provides an electrochemical energy storage device comprising a cover plate, an outer casing, and a roll core. The cover plate comprises a lead-out column and a fixed plate. The lead-out column is a conductor, and the fixed plate is an insulator. The lead-out column is fixed to the fixed plate through a vertical hole. The outer casing is cylindrical, with an opening at at least one end thereof. The insulated fixed plate is sealed and connected to the opening of the outer casing. The roll core is disposed in a cavity inside the outer casing. The roll core is conductively connected to the lead-out column by an upper connecting piece, and the lower connecting piece is conductively connected to the other lead-out end of the outer casing. The roll core is laser welded to the upper and lower connecting pieces, and the periphery of the lead-out column is fixed to the upper roll edge of the upper connecting piece by side laser welding, and the lower roll edge of the lower connecting piece is fixed to the protrusion of the outer casing with a groove by laser penetration welding. This structure ensures 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 fixed plate, which are fixed as an integrated structure. The lead-out column is insulated from the outer casing by the fixed plate, so no other insulating material is needed, resulting in better insulation effect.

[0014]

[0018] 2. A mounting hole is provided at one end of the liquid injection hole near the first cylinder, coaxial with the liquid injection hole. The diameter of the mounting hole is larger than that of the liquid injection hole. A rubber plug and an aluminum plug are placed consecutively in the liquid injection hole and fixed in the mounting hole. The aluminum plug and the first cylinder of the discharge column are welded by a laser. In this structure, the laser welding path avoids the rubber plug during welding to avoid damage to the rubber plug, resulting in a stronger weld.

[0015]

[0019] 3. The inside of the lower end of the outer casing of the present invention protrudes inward to form a protrusion, which is configured to fit closely with the lower connecting piece. A groove is provided on the surface of the outer casing corresponding to the protrusion, facilitating welding of the outer casing and the lower connecting piece. By using this structure instead of the underside of the end, the lower connecting piece is welded to the inner wall of the outer casing, resulting in low internal resistance, high strength, and good stability. When used, the lower connecting piece and the outer casing can provide improved robustness and good vibration resistance. [Brief explanation of the drawings]

[0016] [Figure 1]

[0020] 1 is an exploded structural view of an electrochemical energy storage device according to the present invention; [Figure 2]

[0021] 1 is a schematic structural diagram of an electrochemical energy storage device according to the present invention after installation and configuration. FIG. [Figure 3]

[0022] FIG. 3 is a partially enlarged schematic view of A in FIG. 2. [Figure 4]

[0023] FIG. 3 is a partially enlarged schematic view of B in FIG. 2. [Figure 5]

[0024] 2 is a schematic structural diagram of a cover plate of an electrochemical energy storage device according to the present invention; FIG. [Figure 6]

[0025] 2 is a schematic view of the upper connection piece of the electrochemical energy storage device according to the invention; FIG. [Figure 7]

[0026] 2 is a schematic structural diagram of the upper connection piece of the electrochemical energy storage device according to the present invention; FIG. [Figure 8]

[0027] 2 is a schematic structural diagram of the lower connection piece of the electrochemical energy storage device according to the present invention; FIG. [Figure 9]

[0028] 2 is a schematic structural diagram of the lower connection piece of the electrochemical energy storage device according to the present invention; FIG. [Figure 10]

[0029] 1 is a schematic structural diagram of an outer casing of an electrochemical energy storage device according to the present invention; [Figure 11]

[0030] 1 is a schematic structural diagram of a roll core of an electrochemical energy storage device according to the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017]

[0031] Reference symbols: 1 - outer casing, 2 - lower connecting piece, 3 - roll core, 4 - upper connecting piece, 5 - insulating heat shrink 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 - outlet column, 62 - fixing plate, 611 - liquid injection hole, 612 - positioning column, 613 - mounting hole.

[0018]

[0032] The present invention will be further described below with reference to embodiments. The described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments made by those skilled in the art based on the embodiments of the present invention without any inventive efforts fall 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, the lead-out column 61 being a conductor and the fixing plate 62 being an insulator, the lead-out column 61 penetrating vertically and fixed to the fixing plate 62, the lead-out column 61 having studs or light columns at its ends to facilitate connection between individual elements; a cylindrical outer casing 1 having an opening at at least one end of the outer casing, the fixing plate 62 being sealed by a sealing ring and connected to the opening of the outer casing 1; and a sealing ring disposed in the inner cavity of the outer casing 1. and a roll core 3 welded to the side of the outlet column 61 by an upper connecting piece 4 to achieve a conductive connection, and connected to the other outlet end of the outer casing 1 by a lower connecting piece 2, and as shown in Figures 6 and 7, an upper roll edge 42 used to wrap the roll core 3 is arranged on the periphery of the upper connecting piece 4, an upper positioning hole 41 of the upper roll edge 42 is provided in the center of the upper connecting piece 4, the roll edge of the upper positioning hole 41 is installed in the hole of the roll core 3, and the periphery of the outlet column 61 and the upper roll edge 42 of the upper connecting piece 4 are fixed by side laser welding.

[0020]

[0035] In this embodiment, the cover plate 6 has an annular stepped shape, and the outlet column 61 is disposed in the center of the fixed plate 62. In this embodiment, the outlet column 61 is an aluminum column, the fixed plate 62 is a resin plate, and both the upper connecting piece 4 and the lower connecting piece 2 are aluminum plates. The outer casing 1 is also made of aluminum material.

[0021]

[0036] As shown in FIG. 5 , in this embodiment, the fixed plate 62 has a stepped shape that increases from top to bottom. A sealing groove is provided in the fixed step, and a sealing ring 9 is disposed in the sealing groove. The upper end of the discharge column 61 is a first cylinder. The diameter of the first cylinder is smaller than the diameter of the stepped portion 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 of the discharge column 61 is a 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 connecting 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 connecting piece 4 to cover the welded portion of the discharge column 61 and prevent contact between the upper connecting piece 4 and the outer casing 1. The opening of the outer casing 1 is provided with an enlarged opening 13 for fixing the cover plate 6. The enlarged opening 13 also facilitates installation of the insulating heat-shrinkable sleeve 5.

[0022]

[0037] In this embodiment, the periphery of the lead-out column 61 and the upper roll edge 42 of the upper connecting piece 4 are fixed by side laser welding, and the welding of this structure is performed on the periphery of the lead-out column 61 instead of using the traditional interference 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, improvements compared to Embodiment 1 are mainly described. The same content will not be described. In this embodiment, as shown in FIGS. 8 and 9 , a lower positioning hole 21 is provided in the center of the lower connecting 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 around the periphery of the lower connecting 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, which is configured to closely mate with and position the lower roll edge 22 of the lower connecting piece 2. A groove 11 is provided in the side wall of the outer casing 1 at a position opposite the protrusion 12. The lower roll edge 22 and the protrusion 12 are fixed and electrically connected at the groove 11 by laser penetration welding.

[0024]

[0040] In this embodiment, the inside of the lower end of the outer casing 1 protrudes inward to form a protrusion 12, which is configured to fit closely with the lower connecting piece 2. A groove 11 is provided on the surface of the outer casing 1 corresponding to the protrusion 12, facilitating welding of the outer casing 1 and the lower connecting piece 2. By using this structure instead of the underside of the end, the lower connecting piece 2 is welded to the inner wall of the outer casing 1, resulting in low internal resistance, high strength, and good stability. When used, the lower connecting piece 2 and the outer casing 1 can achieve improved robustness and good vibration resistance. More preferably, the protrusion 12 is an annular protrusion 12, which provides a larger welding surface, low internal resistance, high welding strength, and better vibration resistance. The provision of the groove 11 reduces the thickness of the outer casing 1 at the welding portion, easing the difficulty of the production process and facilitating manufacturing.

[0025]

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

[0026]

[0042] Embodiment 3

[0043] As shown in FIG. 3 , this embodiment is further optimized based on embodiment 2. In this embodiment, improvements compared to embodiment 2 are mainly described; the same content is not 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 electrolyte injection is completed, the liquid injection hole 611 maintains an internal and external insulating seal by using a sealing element, and a positioning column 612 is disposed in the center of the inner surface of the lead-out column 61, communicating with the liquid injection hole 611 and used for positioning with the upper positioning hole 41 of the upper connection piece 4. 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, improvements compared to embodiment 3 are mainly described; the same content is not described. In this embodiment, 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 disposed in the liquid injection hole 611, the aluminum plug 8 is fixed to the attachment 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 connecting piece 4, and a plurality of lower through holes 23 for absorbing the electrolyte by the roll core 3 are provided in the lower connecting piece 2, thereby promoting 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 replacement, and improvement made within the spirit and principle of the present invention are within the protection scope of the present invention.

Claims

1. The electrochemical energy storage device includes a cover plate (6) having a lead-out column (61) and a fixed plate (62), wherein the lead-out column (61) is a conductor and the fixed plate (62) is an insulator, and the lead-out column (61) passes through the cover plate (6) from top to bottom and is fixed integrally to the fixed plate (62); a cylindrical outer casing (1) having an opening at at least one end of the outer casing, and the fixed plate (62) is sealed with a sealing ring (9) and connected to the opening of the outer casing (1); and a roll core (3) disposed in a cavity inside the outer casing (1), the roll core (3) having an upper connection piece (4) welded to a side of the lead-out column (61) to achieve conductive connection and a lower connection piece (2) to be conductively connected to the other lead-out end of the outer casing (1). an upper roll edge (42) used to wrap the roll core (3) is disposed on the periphery of the upper connecting piece (4), the periphery of the outlet column (61) and the upper roll edge (42) of the upper connecting piece (4) are fixed together by side laser welding, a lower roll edge (22) used to wrap the roll core (3) is disposed on the periphery of the lower connecting piece (2), the inner wall of the lower end of the outer casing (1) protrudes inward to form a protrusion (12), the protrusion is 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 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 at the groove (11) by laser penetration welding.

2. 2. The electrochemical energy storage device according to claim 1, wherein the cover plate (6) is annularly stepped and the outlet column (61) is arranged in the center of the fixed plate (62).

3. 3. The electrochemical energy storage device according to claim 2, wherein the fixed plate (62) has a stepped shape 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).

4. 3. The electrochemical energy storage device according to claim 2, wherein the outlet 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.

5. 3. The electrochemical energy storage device of claim 2, wherein an upper positioning hole (41) of the upper roll edge (42) is provided in the center of the upper connecting piece (4), and a lower positioning hole (21) that 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 connecting piece (2).

6. 6. The electrochemical energy storage device according to claim 5, wherein a liquid injection hole (611) for injecting an electrolyte into the roll core (3) is provided through the discharge column (61), the liquid injection hole (611) maintains an internal and external insulating seal by using a sealing element, and a positioning column (612) that communicates with the liquid injection hole (611) and is used for positioning with the upper positioning hole (41) of the upper connection piece (4) is disposed in the center of the inner surface of the discharge column (61).

7. 7. The electrochemical energy storage device according to claim 6, wherein an attachment hole (613) coaxial with the liquid injection hole (611) is provided at one end of the liquid injection hole (611) near a first cylinder, which is the upper end of the discharge column (61), 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 arranged successively in the liquid injection hole (611), the aluminum plug (8) is fixed to the attachment hole (613), and the aluminum plug (8) and the first cylinder of the discharge column (61) are welded by a laser.

8. 3. The electrochemical energy storage device according to claim 2, wherein the upper connection piece (4) is provided with a plurality of upper through-holes (43) for absorbing the 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).

9. 3. The electrochemical energy storage device according to claim 2, wherein the outer surface of the upper connection piece (4) is covered with a high-temperature resistant insulating heat-shrinkable 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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