Electrochemical energy storage device

Abstract

To provide an electrochemical energy storage device which relates to the technical field of electrochemical energy storage devices such as a capacitor.SOLUTION: The electrochemical energy storage device comprises: an upper connecting bar (4); a rubber piece (3) that has an insulating and sealing effect; a housing (7); and a rolled core (5) inside the housing. The device is sealed with the rubber piece and a waisted section of the housing. One end of the upper connecting bar penetrates the rubber piece so as to be conductively connected to a negative electrode welding piece (1), while the other end thereof is conductively connected to the rolled core. The rolled core is conductively connected to the housing by means of a lower connecting piece (6). A positive electrode welding piece (8) is conductively connected to the housing. The rubber piece has an insulation effect, a simple structure, and low cost. The upper connecting bar and the lower connecting piece are used for welding, and thus internal resistance is low and large current charging and discharging are achieved.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of electrochemical energy storage devices, in particular to electrochemical energy storage devices. [Background technology]

[0002] A supercapacitor, also known as an electrochemical capacitor, is an electrochemical device that stores energy by means of a polarizable electrolyte. Due to the high power density, short charging time, and long life of supercapacitors, supercapacitors are increasingly being used as auxiliary energy sources in electric vehicles and smart grid storage systems. A structure in which both the positive and negative electrodes of the capacitor are located on the same side of the housing is called a radial capacitor, which has the disadvantages of high internal resistance, low discharge capacity, and high heat generation. The problem of internal resistance is usually solved by an axial configuration. Since a supercapacitor with a double-sided lead-out has a much lower internal resistance than a radial capacitor, a larger current discharge can be achieved, thereby improving the output performance of the supercapacitor.

[0003] Currently, aluminum cover plates are commonly used for the electrodes of axial capacitors, and the housing is also made of aluminum. Although the cover plate and the housing must be sealed and connected, and an insulating pad must be provided between the cover plate and the housing, there is still a risk of conduction between the cover plate and the housing, which may cause the overall capacitor failure. Moreover, the aluminum cover plate is complicated in structure and expensive. Summary of the Invention [Problem to be solved by the invention]

[0004] The purpose of the present invention is to provide an electrochemical energy storage device. The rubber piece features good insulation effect, simple structure and low cost. The present invention realizes low internal resistance for high current charging and discharging by using the upper connecting rod and the lower connecting piece to weld. [Means for solving the problem]

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: An electrochemical energy storage device comprising an upper connecting rod, a rubber piece having insulating and sealing effects, a housing, and a roll core, the housing being cylindrical in shape and having an opening at at least one end, the rubber piece and the housing being sealed and connected by a waisted section provided in the housing, the roll core being provided in a cavity inside the housing, one end of the upper connecting rod penetrating the rubber piece and connected conductively to the negative electrode welding piece, while the other end of the upper connecting rod is connected conductively to the roll core, the roll core being connected conductively to the housing by the lower connecting piece, and the positive electrode welding piece being connected conductively to the housing.

[0006] Furthermore, the upper connecting rod is made of aluminum and has a bottom surface used for welding to the roll core, a cylinder provided on one side of the bottom surface, and a positioning rod provided on the other side of the bottom surface and used for positioning with the central hole of the roll core. The rubber piece is provided with a first through hole, and the rubber piece is sleeved onto the cylinder of the upper connecting rod by the first through hole. The diameter of the bottom surface of the upper connecting rod is smaller than the inner diameter of the waisted body part of the housing.

[0007] Further, a Bakelite plate is fixedly connected to one side of the rubber piece, and a second through hole is provided in the center of the Bakelite plate and passes through the plate corresponding to the first through hole. The first through hole and the second through hole have the same diameter. Adding additional material to the rubber strip increases the strength of the rubber strip so that it seals better.

[0008] In addition, a fixed piece is provided between the upper connecting rod and the negative electrode welding piece, a third through hole penetrates the fixed piece at the center of the fixed piece, the cylinder of the upper connecting rod penetrates the third through hole and is fixed to the edge of the third through hole by welding, and the negative electrode welding piece is conductively connected to the fixed piece.

[0009] Additionally, both the negative and positive weld strips are fabricated from aluminum, plated with nickel or tin, and can be welded to the circuit board for ease of use. Furthermore, the lower connecting piece is made of aluminum and welded to the roll core, with a locating hole protruding from the center of the lower connecting piece and inserted into the central hole of the roll core.

[0010] Furthermore, a first explosion-proof valve is provided at the center of the bottom of the housing, and a second explosion-proof valve is provided on a side wall of the housing. Further, the first explosion-proof valve is a first groove formed in the side wall at the end of the housing, the thickness of the first groove being smaller than the thickness of the side wall at the end of the housing, and the second explosion-proof valve is a second groove formed in the side wall of the housing, the thickness of the second groove being smaller than the thickness of the side wall of the housing.

[0011] In addition, the positive welded piece is provided with a third through hole penetrating the positive welded piece, and the diameter of the third through hole is larger than the outer diameter of the first explosion-proof valve, which ensures that the explosion-proof valve can be opened normally within a set pressure range.

[0012] Moreover, the rubber strips are made from butyl rubber or ethylene propylene diene monomer rubber, and the cost of the rubber strips is lower than that of the aluminum cover plate. Effect of the Invention

[0013] Compared with the prior art, the present invention has the following advantages: 1. The present invention provides an electrochemical energy storage device, which is an axial electrochemical energy storage device. The upper connecting rod and the lower connecting piece are used for welding to lower the internal resistance for high current charging and discharging, and the positive and negative welding pieces are used for welding the present invention to a circuit board.

[0014] 2. The upper connecting rod is welded to the fixed piece to improve the strength of the rubber piece so that the rubber piece will not deform during use. A Bakelite plate is provided on the surface of the rubber piece to increase the strength of the rubber piece and prevent it from deforming. Compared with the traditional needle-type products, there is a lower risk of leakage, and at the same time, the rubber piece of the structure provided by the present invention is significantly cheaper than the traditional aluminum cover plate. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is an exploded structural view of the electrochemical energy storage device of the present invention. [Diagram 2] FIG. 2 is a schematic structural diagram of the electrochemical energy storage device of the present invention after assembly. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 2 is a schematic structural diagram of a rubber piece with a Bakelite plate of the electrochemical energy storage device of the present invention. [Diagram 5] FIG. 2 is a schematic structural diagram of the upper connecting rod of the electrochemical energy storage device of the present invention. [Figure 6] FIG. 2 is a schematic structural diagram of the first explosion-proof valve of the electrochemical energy storage device of the present invention. [Figure 7] FIG. 2 is a schematic structural diagram of the second explosion-proof valve of the electrochemical energy storage device of the present invention. [Figure 8] FIG. 2 is a schematic structural diagram of the lower connecting piece of the electrochemical energy storage device of the present invention. [Figure 9] FIG. 2 is a schematic structural diagram of a positive electrode welding piece of the electrochemical energy storage device of the present invention. [Figure 10] FIG. 2 is a schematic structural diagram of a negative electrode welding piece of the electrochemical energy storage device of the present invention. [Figure 11] FIG. 2 is a schematic structural diagram of the roll core of the electrochemical energy storage device of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Reference symbols in the drawings: 1 - negative electrode welding piece, 2 - fixed piece, 3 - rubber piece, 4 - upper connecting rod, 5 - roll core, 6 - lower connecting piece, 7 - housing, 8 - positive electrode welding piece, 9 - narrowed body portion, 31 - Bakelite plate, 41 - cylinder, 42 - bottom surface, 43 - positioning rod, 51 - central hole in roll core, 61 - positioning hole.

[0017] 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 obtained by those skilled in the art based on the embodiments of the present invention without any inventive work are within the scope of the present invention.

[0018] EMBODIMENT 1 As shown in Figures 1 to 3, the electrochemical energy storage device includes an upper connecting rod 4, a rubber piece 3 having insulating and sealing effects, a housing 7, and a roll core 5. The housing 7 is cylindrical and has an opening at at least one end. The rubber piece 3 and the housing 7 are sealed and connected by a narrowed body portion 9 provided in the housing 7. The roll core 5 is provided in a cavity inside the housing 7. One end of the upper connecting rod 4 penetrates the rubber piece 3 and is electrically connected to the negative electrode welding piece 1, while the other end of the upper connecting rod 4 is electrically connected to the roll core 5. The roll core 5 is electrically connected to the housing 7 by the lower connecting piece 6. A positive electrode welding piece 8 is welded to the housing 7 through which it penetrates in order to be electrically connected. Furthermore, the positive electrode welding piece 8 is electrically connected to the positive electrode of the roll core 5 via the housing 7 and the lower connecting piece 6. Both the negative and positive welding strips 1 and 8 are made of aluminum, plated with nickel or tin, and can be welded to a circuit board for ease of use. In this embodiment, the rubber strip 3 is made of butyl rubber or ethylene propylene diene monomer rubber. The cost of the rubber strip is lower than that of the aluminum cover plate.

[0019] As shown in Fig. 5 and Fig. 11, in this embodiment, the upper connecting rod 4 is made of aluminum. The upper connecting rod 4 has a bottom surface 42 welded to the roll core 5, a cylinder 41 provided on one side of the bottom surface 42, and a positioning rod 43 provided on the other side of the bottom surface 42 and used for positioning with the central hole of the roll core 5. The diameter of the positioning rod 43 is slightly smaller than the diameter of the central hole of the roll core 5, and the positioning rod can be installed in the central hole of the roll core 5 for positioning. The bottom surface 42 may be conductively connected to the roll core 5 by welding. The rubber piece 3 is provided with a first through hole, and the rubber piece 3 is sleeved to the cylinder 41 of the upper connecting rod 4 by the first through hole. The diameter of the bottom surface 42 of the upper connecting rod 4 is smaller than the inner diameter of the waisted body part 9 of the housing 7.

[0020] More specifically, the fixed piece 2 is provided between the upper connecting rod 4 and the negative electrode welding piece 1. A third through hole penetrates the fixed piece 2 at the center thereof, and the cylinder 41 of the upper connecting rod 4 penetrates the third through hole and is fixed to the edge of the third through hole by welding. The negative electrode welding piece 1 is welded to the fixed piece 2 so as to be electrically connected to the upper connecting rod 4, and the negative electrode welding piece 1 is electrically connected to the roll core 5 via the fixed piece 2 and the upper connecting rod 4.

[0021] The electrochemical energy storage device comprises a structure including a rubber piece 3, a housing 7, and a roll core 5. The rubber piece 3 is fitted into the housing 7 and located outside the housing, and the roll core 5 is located in a cavity formed between the housing 7 and the rubber piece 3. A first through hole of the rubber piece 3 protrudes from the upper connecting rod 4, a cylinder 41 of the upper connecting rod 4 penetrates and is fixed to the first through hole of the rubber piece 3, and a bottom surface 42 of the upper connecting rod 4 is welded to one end of the roll core 5. The insulating rubber piece 3 is sealed and connected to the opening of the housing 7, and the cylinder 41 of the upper connecting rod 4 is exposed to the outside and fixed to the first through hole of the rubber piece 3. The lower connection piece 6 is fixed to the case 7 by welding, and the negative and positive electrodes of the electrochemical energy storage device are led out from the upper connection rod 4 and the lower connection piece 6, respectively, and the negative and positive welding pieces 1 are led outward, and the negative and positive welding pieces 1 are welded to the bottom and the fixing piece 2 of the case 7, respectively, facilitating welding to the circuit board of the product.

[0022] As shown in Fig. 4, in order to improve the strength of the rubber piece 3, a bakelite plate 31 is fixedly connected to one side of the rubber piece 3, and the rubber piece 3 has the same outer diameter as the bakelite plate 31. A second through hole is provided in the center of the bakelite plate 31 through the plate and corresponds to the first through hole. The first through hole and the second through hole have the same diameter. Adding the bakelite plate 31 to the rubber piece 3 increases the strength of the rubber piece 3 so that the rubber piece can seal better.

[0023] EMBODIMENT 2 As shown in Fig. 8, this embodiment is further optimized based on embodiment 1. The improvement of this embodiment compared with embodiment 1 is the focus of the description, and the similarities are not repeated. In this embodiment, the lower connection piece 6 may be made of aluminum and conductively connected to the positive electrode of the roll core 5 by welding. A positioning hole 61 protrudes from the center of the lower connection piece 6, and the outer diameter of the positioning hole 61 is smaller than the outer diameter of the central hole of the roll core 5, so that the positioning hole can be placed in the central hole of the roll core 5 for positioning.

[0024] EMBODIMENT 3 As shown in Figures 6 and 7, this embodiment is further optimized based on embodiment 1. The improvement of this embodiment compared with embodiment 1 is the focus of the description, and the similarities are not repeated. In this embodiment, a first explosion-proof valve is provided at the center of the bottom of the housing 7, and a second explosion-proof valve is provided at the side wall of the housing 7.

[0025] The first explosion-proof valve is a first groove formed in the side wall at the end of the housing 7, and the thickness of the first groove is smaller than the thickness of the side wall at the end of the housing 7, and the second explosion-proof valve is a second groove formed in the side wall of the housing 7, and the thickness of the second groove is smaller than the thickness of the side wall of the housing 7. As shown in Figures 9 and 10, the positive electrode welding piece 8 is provided with a third through hole penetrating the positive electrode welding piece, and the diameter of the third through hole is larger than the outer diameter of the first explosion-proof valve. This ensures that the explosion-proof valve can normally be opened within a set pressure range.

[0026] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made without departing from the spirit and principles of the present invention are within the scope of the present invention.

Claims

1. An electrochemical energy storage device comprising an upper connecting rod (4), a rubber piece (3) having insulating and sealing effects, a housing (7), and a roll core (5), wherein the housing (7) is cylindrical and has an opening at at least one end, the rubber piece (3) and the housing (7) are sealed and connected by a narrowed body portion (9) provided in the housing (7), the roll core (5) is provided in a cavity inside the housing (7), the upper connecting rod (4) has a bottom surface (42), and the bottom surface (42) has a bottom surface (42) on one side thereof. The roll core (5) is electrically connected to the housing (7) by a lower connection piece (6), and a positive electrode welding piece (8) is electrically connected to the housing (7). A bakelite plate (31) is fixedly connected to one side of the rubber piece (3), and the rubber piece (3) has the same outer diameter as the bakelite plate (31); An electrochemical energy storage device, characterized in that a fixed piece (2) is provided between the upper connecting rod (4) and the negative electrode welding piece (1), and the negative electrode welding piece (1) is electrically connected to the fixed piece (2).

2. 2. The electrochemical energy storage device according to claim 1, wherein the upper connecting rod (4) is made of aluminum, the bottom surface (42) is used for welding to the roll core (5), the upper connecting rod (4) further comprises a positioning rod (43) provided on the opposite side of the bottom surface (42) and used for positioning with a central hole of the roll core (5), and the diameter of the bottom surface (42) of the upper connecting rod (4) is smaller than the inner diameter of the waist portion (9) of the housing (7).

3. 3. The electrochemical energy storage device of claim 2, wherein a second through-hole is provided in the center of the Bakelite plate (31) and passes through the plate corresponding to the first through-hole, and the first through-hole and the second through-hole have the same diameter.

4. 4. The electrochemical energy storage device according to claim 2 or 3, characterized in that a third through hole penetrates the fixing piece (2) at the center thereof, and the cylinder (41) of the upper connecting rod (4) penetrates the third through hole and is fixed to the edge of the third through hole by welding.

5. 5. The electrochemical energy storage device according to claim 4, characterized in that the negative electrode weld piece (1) and the positive electrode weld piece (8) are both made of aluminum and plated with nickel or tin.

6. 6. The electrochemical energy storage device according to claim 5, characterized in that the lower connecting piece (6) is made of aluminum and is welded to the roll core (5), a positioning hole (61) protruding from the center of the lower connecting piece (6), and the positioning hole (61) is inserted into a central hole of the roll core (5).

7. 7. The electrochemical energy storage device according to claim 6, characterized in that a first explosion-proof valve is provided in the center of the bottom of the housing (7) and a second explosion-proof valve is provided in a side wall of the housing (7).

8. 8. The electrochemical energy storage device according to claim 7, wherein the first explosion-proof valve is a first groove formed in a side wall at an end of the housing (7), the thickness of the first groove being smaller than the thickness of the side wall at the end of the housing (7), and the second explosion-proof valve is a second groove formed in a side wall of the housing (7), the thickness of the second groove being smaller than the thickness of the side wall of the housing (7).

9. 9. The electrochemical energy storage device according to claim 8, wherein the positive electrode welding piece (8) is provided with a third through-hole penetrating the positive electrode welding piece, and the diameter of the third through-hole is larger than the outer diameter of the first explosion-proof valve.

10. 2. The electrochemical energy storage device according to claim 1, characterized in that the rubber piece (3) is made of butyl rubber or ethylene propylene diene monomer rubber.

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