Winding type double-electric-layer super capacitor single cell and manufacturing method thereof

Abstract

The invention relates to a winding type double-electric-layer super capacitor single cell and a manufacturing method thereof, the cell comprises two electrode plates, the first electrode plate comprises two electrode bands, the two electrode bands are connected through an insulating band, one side of the first electrode band is connected with a first capacitor external connection end, and one side of the second electrode band is connected with a second capacitor external connection end; the projection of the second electrode plate on the first electrode plate is overlapped with the two electrode bands of the first electrode plate at the same time, and the second electrode plate is used for storing charges and realizing energy transfer between the two electrode bands of the first electrode plate; according to the invention, the series connection effect equivalent to that of two or more cells in the prior art can be realized in one single electric double-layer capacitor, the bottleneck of low withstand voltage of a single pair of cells is broken through, and the working voltage output by the electric double-layer capacitor to the outside is improved from the internal design of the single cell, so that the external series connection number is reduced, and the capacity of the capacitor is improved under the condition of smaller volume. And the requirement of equipment on voltage improvement is met.

Description

Technical Field

[0001] The present invention relates to a capacitor, and particularly to a wound electric double layer supercapacitor single cell and a manufacturing method thereof. Background Art

[0002] As a high-power and long-life energy storage component, the electric double layer supercapacitor is increasingly widely used in energy storage fields such as wind energy, solar energy, and power stations to provide application scenarios with high reliability and long life. The electric double layer supercapacitor is generally manufactured by a winding method. The current wound electric double layer supercapacitor single cell includes electrode sheets, a separator, and adhesive tape. At present, the electrode sheet materials on the market are one positive electrode sheet and one negative electrode sheet each. The positive electrode sheet and the negative electrode sheet are stacked on top of each other, and a separator is added in the middle and then wound to form a cell. The positive electrode sheet and the negative electrode sheet are respectively connected to a terminal (this terminal is used for connecting the capacitor to external devices). Constrained by the materials, the withstand voltage of the electrode materials of a single capacitor is difficult to exceed 3.0V, otherwise it will cause a rapid attenuation of the life. When it is necessary to increase the voltage, multiple capacitors need to be connected in series to form a series module to achieve the effect of increasing the voltage. However, the series connection of multiple capacitors will cause problems such as increased process complexity, reduced reliability, increased volume, and increased cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a wound electric double layer supercapacitor single cell and a manufacturing method thereof in view of the defects of the existing cell electrode sheet materials having limited withstand voltage capacity and being unable to achieve high voltage, and the series welding of capacitors increasing the length, weight, and cost of the product.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] On the one hand, a wound electric double layer supercapacitor single cell is constructed. The cell is cylindrical, and is formed by stacking electrode sheets and separators alternately and winding with the separator as the outermost layer. The number of the electrode sheets is two.

[0006] The first electrode sheet includes two electrode strips arranged sequentially in a first direction. Among them: the two electrode strips are connected by an insulating strip. One side of the first electrode strip pointing in the opposite direction of the first direction is connected to the first capacitor external connection end, and one side of the second electrode strip pointing in the first direction is connected to the second capacitor external connection end. The first direction is parallel to the bus direction of the cell.

[0007] The second electrode sheet includes an electrode strip, and the projection of the electrode strip of the second electrode sheet on the first electrode sheet overlaps with both electrode strips of the first electrode sheet at the same time. The electrode strip of the second electrode sheet is used for storing charge and realizing energy transfer between the two electrode strips of the first electrode sheet.

[0008] Furthermore, in the wound-type electric double-layer supercapacitor single cell core of the present invention, the electrode strip includes a current collector and a coating layer coated on one side / both sides of the current collector. The current collector of the first electrode strip in the first electrode sheet extends in the opposite direction of the first direction to form a non-coated blank area as the first capacitor external connection end, and the second electrode strip in the first electrode sheet extends in the first direction to form a non-coated blank area as the second capacitor external connection end.

[0009] Furthermore, in the wound-type electric double-layer supercapacitor single cell core of the present invention, there is no need to coat the area on the current collector of the electrode strip of the second electrode sheet that is covered by the projection of the insulating strip in the first electrode sheet as a blank area.

[0010] Furthermore, in the wound-type electric double-layer supercapacitor single cell core of the present invention, the current collector is aluminum foil, and the coating layer includes activated carbon.

[0011] Furthermore, in the wound-type electric double-layer supercapacitor single cell core of the present invention, the number of diaphragms of the cell core is two. The second electrode sheet, the first diaphragm, the first electrode sheet, and the second diaphragm are stacked in sequence. The second electrode sheet is the innermost layer during winding, and the second diaphragm is the outermost layer during winding. The length of the diaphragm in the winding direction exceeds that of the electrode sheet in the winding direction to form an insulating effect.

[0012] On the second aspect, a wound-type electric double-layer supercapacitor single cell core is constructed. The cell core is cylindrical and is wound with the electrode sheets and diaphragms stacked alternately with the diaphragm as the outermost layer. The number of electrode sheets is two, and each electrode sheet includes multiple electrode strips arranged in sequence along the first direction. Adjacent electrode strips are connected by an insulating strip. The projection of the insulating strip in the second electrode sheet on the first electrode sheet and the insulating strip in the first electrode sheet are arranged at intervals. The energy transfer between the two electrode strips connected by the insulating strip on each electrode sheet is achieved through the electrode strip on the other electrode sheet that projects and covers the insulating strip. The first direction is parallel to the bus direction of the cell core, wherein:

[0013] The number of insulating strips of the two electrode sheets is equal: one side of the first electrode strip of the first electrode sheet pointing in the opposite direction of the first direction is connected to the first capacitor external connection end, and one side of the last electrode strip of the second electrode sheet pointing in the first direction is connected to the second capacitor external connection end;

[0014] Alternatively, the first electrode sheet has one more insulating strip than the second electrode sheet: one side of the first electrode strip of the first electrode sheet facing the opposite direction of the first direction is connected to the first external capacitor terminal, and one side of the last electrode strip of the first electrode sheet facing the first direction is connected to the second external capacitor terminal.

[0015] Further, in the wound type electric double layer supercapacitor single cell core of the present invention, the electrode strip includes a current collector and a coating layer coated on one side / both sides of the current collector. The current collector of the first electrode strip in the first electrode sheet extends further in the opposite direction of the first direction to form a blank area as the first external capacitor terminal;

[0016] When the number of insulating strips of the two electrode sheets is equal, the last electrode strip in the second electrode sheet extends further in the first direction to form a blank area as the second external capacitor terminal;

[0017] When the first electrode sheet has one more insulating strip than the second electrode sheet, the last electrode strip in the first electrode sheet extends further in the first direction to form a blank area as the second external capacitor terminal.

[0018] Further, in the wound type electric double layer supercapacitor single cell core of the present invention, if a certain electrode strip on an electrode sheet covers a certain insulating strip on another electrode sheet in projection, then there is no need to coat the area on the current collector of the certain electrode strip covered by the projection of the certain insulating strip as a blank area.

[0019] Further, in the wound type electric double layer supercapacitor single cell core of the present invention, the number of diaphragms of the cell core is two. The second electrode sheet, the first diaphragm, the first electrode sheet, and the second diaphragm are stacked in sequence. The second electrode sheet is the innermost layer during winding, and the second diaphragm is the outermost layer during winding. The length of the diaphragm in the winding direction exceeds the length of the electrode sheet in the winding direction to form an insulating effect.

[0020] Thirdly, a manufacturing method of a wound type electric double layer supercapacitor single cell core is constructed for manufacturing the cell core described in any one of the foregoing items. The method is characterized in that the method includes:

[0021] Manufacture two electrode sheets;

[0022] Stack the electrode sheets and the diaphragms alternately and wind them with the diaphragm as the outermost layer;

[0023] After winding, the first external capacitor terminal forms a connection with the end cover, and then the cell core is assembled into the housing. The second external capacitor terminal forms a connection with the bottom cover of the housing, and electrolyte is filled and sealed to form a closed single cell; wherein, positive and negative terminals are respectively arranged on the end cover and the bottom cover of the housing.

[0024] The wound-type electric double-layer supercapacitor single cell and its manufacturing method of the present invention have the following beneficial effects: The present invention changes the structure of a single electrode sheet. The electrode sheet is formed by connecting two electrode strips through an insulating tape. The energy transfer between the two electrode strips connected by the insulating tape on each electrode sheet is realized through the electrode strip on another electrode sheet that projects and covers the insulating tape. In this way, the present invention can achieve a series effect equivalent to that of two or more traditional single cells inside a single electric double-layer capacitor, breaking through the bottleneck of low voltage resistance of a single pair of cell materials, improving the working voltage output from the electric double-layer capacitor from the internal design of the single cell, thereby reducing the number of external series connections, and meeting the equipment's demand for increased voltage in a smaller volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings:

[0026] Figure 1 is a winding schematic diagram of the wound-type electric double-layer supercapacitor single cell of the present invention;

[0027] Figure 2 is a schematic diagram of the first electrode sheet in Embodiment 1;

[0028] Figure 3 is a schematic diagram of the second electrode sheet in Embodiment 1;

[0029] Figure 4 is a cross-sectional schematic diagram of the multi-layer structure in Embodiment 1 with the separator removed;

[0030] Figure 5 is a cross-sectional schematic diagram of the multi-layer structure in Embodiment 2 with the separator removed;

[0031] Figure 6 is a cross-sectional schematic diagram of the multi-layer structure in Embodiment 3 with the separator removed;

[0032] Figure 7 is a cross-sectional schematic diagram of the multi-layer structure in Embodiment 4 with the separator removed;

[0033] Figure 8 is a cross-sectional schematic diagram of the multi-layer structure in Embodiment 4 with the separator removed;

[0034] Figure 9 is a cross-sectional schematic diagram of the multi-layer structure in Embodiment 5 with the separator removed;

[0035] Figure 10 It is a side view after the core winding is completed;

[0036] Figure 11 It is a schematic diagram of the core assembly;

[0037] Figure 12 It is a schematic diagram of the assembly after the core is canned and sealed. Detailed implementation manners

[0038] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The typical embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. Without conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0039] Reference Figure 1 , the wound-type electric double-layer supercapacitor single core of the present invention is cylindrical and is wound by a multi-layer structure. The multi-layer structure is stacked together in an alternating manner of electrode sheets and separator 3, and when winding, separator 3 is used as the outermost layer for winding. Separator 3 is a porous material made of an insulating material and can be used for ion penetration. The length of separator 3 in the winding direction exceeds the length of the electrode sheet in the winding direction. When winding, separator 3 is first wound several times to prevent the electrode sheet from being wound inside to form an insulating effect.

[0040] The number of the electrode sheets in the multi-layer structure is two, namely the first electrode sheet 1 and the second electrode sheet 2. The number of separator 3 in the multi-layer structure is also two. The second electrode sheet 2, the first separator 3, the first electrode sheet 1, and the second separator 3 are stacked in sequence. The second electrode sheet 2 is the innermost layer during winding, and the second separator 3 is the outermost layer during winding. Of course, the positions of the second electrode sheet 2 and the first electrode sheet 1 can also be swapped, that is, the first electrode sheet 1, the first separator 3, the second electrode sheet 2, and the second separator 3 are stacked in sequence, and the first electrode sheet 1 is the innermost layer during winding.

[0041] The present invention improves the structures of the electrode sheets 1 and 2. The electrode sheet is divided by an insulating tape to form electrode strips for storing charges. The energy transfer between the two electrode strips connected by the insulating tape is realized through the electrode strip on the other electrode sheet that projects and covers the insulating tape. Below, according to the different numbers of electrode strips in the electrode sheets 1 and 2 and slightly different structures of the electrode strips, four typical embodiments are provided for detailed description.

[0042] Example 1

[0043] In this embodiment, the first electrode sheet 1 provides two capacitor external connection terminals for connection with external devices. The second electrode sheet 2 does not provide any external connection terminals and is used for charge storage and realizes the function of intermediate charge transition. The first electrode sheet 1 is cut into two electrode strips by an insulating tape. Only one electrode strip on the second electrode sheet 2 is responsible for the charge transfer between the two electrode strips on the first electrode sheet 1.

[0044] Specifically refer to Figures 2 - 4 , in this embodiment, the first electrode sheet 1 includes two electrode strips 100 arranged in sequence along the first direction. The entire battery cell is finally wound into a cylindrical shape, and the first direction is parallel to the busbar direction of the battery cell.

[0045] The first electrode sheet 1 includes two electrode strips 100 arranged in sequence along the first direction, where: the two electrode strips 100 are connected by an insulating tape 200. The first electrode strip 100 on the left is connected to the first capacitor external connection terminal on the side pointing to the opposite direction of the first direction, and the second electrode strip 100 on the right is connected to the second capacitor external connection terminal on the side pointing to the first direction. Specifically, the electrode strip 100 includes a current collector 101 and coating layers 102 coated on both sides of the current collector 101. In other embodiments, it can also be single-sided coating. The current collector 101 is aluminum foil, and the coating layer 102 includes activated carbon.

[0046] Furthermore, the current collector 101 of the first electrode strip 100 in the first electrode sheet 1 continues to extend in the opposite direction of the first direction to form a non-coated blank area 1011 as the first capacitor external connection terminal, and the current collector 101 of the second electrode strip 100 in the first electrode sheet 1 continues to extend in the first direction to form a non-coated blank area 1011 as the second capacitor external connection terminal. The first capacitor external connection terminal and the second capacitor external connection terminal are used for welding in the subsequent process.

[0047] The second electrode sheet 2 has only one electrode strip 100. Specifically refer to Figure 4 , the projection of the electrode strip 100 of the second electrode sheet 2 on the first electrode sheet 1 overlaps with both electrode strips 100 of the first electrode sheet 1 at the same time, specifically completely covering the two electrode strips 100 of the first electrode sheet 1. The electrode strip 100 of the second electrode sheet 2 is used to realize the charge transfer between the two electrode strips 100 of the first electrode sheet 1. As Figure 4The arrow in the figure indicates the path of charge transfer. The external terminal of the first capacitor transfers energy to the first electrode strip 100 of the first electrode sheet 1. The first electrode strip 100 of the first electrode sheet 1 transfers energy to the electrode strip 100 of the second electrode sheet 2. Then, the electrode strip 100 of the second electrode sheet 2 transfers the charge to the second electrode strip 100 of the first electrode sheet 1, and the second electrode strip 100 transfers the energy to the external terminal of the second capacitor.

[0048] In this embodiment, in order to save the coating material, there is no need to coat the area on the current collector 101 of the electrode strip 100 of the second electrode sheet 2 that is covered by the projection of the insulating strip 200 in the first electrode sheet 1, which serves as the blank area 1011.

[0049] It can be seen that in this embodiment, the positive and negative electrodes of the capacitor are made on the same first electrode sheet 1. The current collectors of the first electrode sheet 1 are separated by the insulating strip 200 and serve as the positive and negative electrodes of the capacitor respectively, and the two current collectors do not contact each other. The current collector made of aluminum foil of the second electrode sheet 2 is an integral body, and the second electrode sheet 2 serves as the charge storage function and realizes energy transfer. The entire battery cell forms the effect of two battery cells in series in a conventional product, so the battery cell can withstand higher voltage.

[0050] Embodiment Two

[0051] Reference Figure 5 Compared with Embodiment One, the difference in this embodiment is the structure of the electrode strip 100 of the second electrode sheet 2. In this embodiment, there is no reserved blank area 1011 on the current collector 101 of the electrode strip 100 of the second electrode sheet 2, and the coating layer 102 of the entire current collector 101 is continuous.

[0052] It can be understood that the number of electrode strips 100 in the first electrode sheet 1 and the second electrode sheet 2 is not limited to those shown in Embodiment One and Two. Theoretically, there can be more electrode strips 100 in the first electrode sheet 1, and then more insulating strips 200 can be added in the second electrode sheet 2 to divide more electrode strips 100, as long as the number of insulating strips 200 in the first electrode sheet 1 is the same as or one more than the number of insulating strips 200 in the second electrode sheet 2, and it is necessary to ensure that the projection of the insulating strip 200 in the second electrode sheet 2 on the first electrode sheet 1 is arranged alternately with the insulating strip 200 in the first electrode sheet 1. Embodiments Three to Four below will take the example of setting three electrode strips 100 in the first electrode sheet 1 and two electrode strips 100 in the second electrode sheet 2 for illustration, and Embodiments Five to Six will take the example of setting two electrode strips 100 in the first electrode sheet 1 and also two electrode strips 100 in the second electrode sheet 2 for illustration.

[0053] Embodiment Three

[0054] ReferenceFigure 6 In this embodiment, the difference from the first embodiment is that the number of insulating tapes 200 in the first electrode sheet 1 is two, and correspondingly, the number of electrode strips 100 divided is three. The three electrode strips 100 are arranged in sequence along the first direction. Similarly, adjacent electrode strips 100 are all connected by one insulating tape 200. One side of the first electrode strip 100 pointing to the opposite direction of the first direction is connected to the first capacitor external terminal, and one side of the last, i.e., the third electrode strip 100 pointing to the first direction is connected to the second capacitor external terminal.

[0055] In order to achieve the charge transition of the three electrode strips 100, two electrode strips 100 also need to be divided in the second electrode sheet 2. Therefore, one more insulating tape 200 is also needed in the second electrode sheet 2. The two electrode strips 100 in the second electrode sheet 2 are also arranged in sequence along the first direction, and the two electrode strips 100 are also connected by one insulating tape 200. The projection of the insulating tape 200 in the second electrode sheet 2 on the first electrode sheet 1 is arranged at intervals with the insulating tape 200 in the first electrode sheet 1. Specifically, it is located between the two insulating tapes 200 in the first electrode sheet 1. Therefore: the projection of the first electrode strip 100 of the second electrode sheet 2 on the first electrode sheet overlaps with the two electrode strips 100 (i.e., the first and second electrode strips 100) connected by the first insulating tape 200 in the first electrode sheet 1 at the same time. In this way, the first electrode strip 100 in the first electrode sheet 1 transfers energy to the first electrode strip 100 of the second electrode sheet 2, and the first electrode strip 100 of the second electrode sheet 2 then transfers energy to the second electrode strip 100 of the first electrode sheet 1; the projection of the second electrode strip 100 of the second electrode sheet 2 on the first electrode sheet overlaps with the two electrode strips 100 (i.e., the second and third electrode strips 100) connected by the second insulating tape 200 in the first electrode sheet 1 at the same time. In this way, the second electrode strip 100 in the first electrode sheet 1 transfers energy to the second electrode strip 100 of the second electrode sheet 2, and the second electrode strip 100 of the second electrode sheet 2 then transfers energy to the third electrode strip 100 of the first electrode sheet 1.

[0056] The projection of the insulating tape 200 in the second electrode sheet 2 on the first electrode sheet 1 is at the exact middle position between the two insulating tapes 200 in the first electrode sheet 1. Similarly, when the insulating tapes 200 in the first electrode sheet 1 and the second electrode sheet 2 increase, the projection of the insulating tape 200 in the second electrode sheet 2 on the first electrode sheet 1 is arranged at uniform intervals with the insulating tape 200 in the first electrode sheet 1, and the projection of the insulating tape 200 in the second electrode sheet 2 on the first electrode sheet 1 is all located between the first insulating tape 200 and the last insulating tape 200 in the first electrode sheet 1.

[0057] Similar to the embodiments, in order to save coating materials, in the projection area of the two insulating tapes 200 of the first electrode sheet 1, the current collectors 101 of the two electrode strips 100 of the second electrode sheet 2 do not need to be coated and are used as blank areas 1011. In the projection area of the insulating tape 200 of the second electrode sheet 2, the current collector 101 of the second electrode strip 100 of the first electrode sheet 1 does not need to be coated and is used as a blank area 1011.

[0058] It can be seen that in this embodiment, the three current collectors of the first electrode sheet 1 do not contact each other, and the two current collectors in the second electrode sheet 2 do not contact each other, realizing the charge storage of the three current collectors of the first electrode sheet 1 and realizing energy transfer. The entire battery cell forms the effect of three battery cells connected in series in a conventional product, so the battery cell can withstand a higher voltage.

[0059] Of course, in other embodiments, the insulating tape 200 of the first electrode sheet 1 can be increased, and the insulating tape 200 of the second electrode sheet 2 is synchronously increased, as long as the insulating tape 200 of the first electrode sheet 1 is one more than the insulating tape 200 of the second electrode sheet 2, and the projections of the insulating tapes 200 of the two electrode sheets 1 and 2 are arranged at intervals.

[0060] Embodiment 4

[0061] Reference Figure 7 Compared with Embodiment 3, the difference in this embodiment is the structure of the electrode strips 100 of the first electrode sheet 1 and the second electrode sheet 2. In this embodiment, there is no reserved blank area 1011 on the current collectors 101 of the electrode strips 100 of the first electrode sheet 1 and the second electrode sheet 2, and the coating layer 102 of the current collector 101 of each electrode strip 100 is continuous.

[0062] Embodiment 5

[0063] Compared with the previous embodiments, the external capacitor terminals can also be respectively arranged on the two electrode sheets 1 and 2 to realize the connection between the capacitor terminals and the outside. At this time, the number of the electrode strips 100 of the first electrode sheet 1 and the second electrode sheet 2 is the same, that is, the number of the insulating tapes 200 is the same, but the projections of the insulating tapes 200 of the two electrode sheets 1 and 2 are still arranged at intervals.

[0064] Reference Figure 8 At this time, the current collector 101 of the first electrode strip 1 in the first electrode sheet 1 continues to extend in the opposite direction of the first direction to form a blank area 1011 as the first capacitor external terminal. The last electrode strip 100 in the second electrode sheet 1 continues to extend in the first direction to form a blank area 1011 as the second capacitor external terminal.

[0065] Such as Figure 8As shown by the arrows, the first electrode strip 100 in the first electrode sheet 1 transfers energy to the first electrode strip 100 in the second electrode sheet 2, and then the first electrode strip 100 in the second electrode sheet 2 transfers energy to the second electrode strip 100 in the first electrode sheet 1, and then the second electrode strip 100 in the first electrode sheet 1 transfers energy to the second electrode strip 100 in the second electrode sheet 2.

[0066] Similarly, in order to save paint, and similar to Embodiments 1 and 3, in order to save coating materials, the current collector 101 of the second electrode strip 100 in the second electrode sheet 2 does not need to be coated within the projection area of the insulating strip 200 of the first electrode sheet 1 as a blank area 1011, and the current collector 101 of the first electrode strip 100 in the first electrode sheet 1 does not need to be coated within the projection area of the insulating strip 200 of the second electrode sheet 2 as a blank area 1011.

[0067] Of course, in other embodiments, the insulating strip 200 of the first electrode sheet 1 can be increased, and then the insulating strip 200 of the second electrode sheet 2 is synchronously increased, as long as the number of the insulating strips 200 of the first electrode sheet 1 and the second electrode sheet 2 is the same, and the projections of the insulating strips 200 of the two electrode sheets 1 and 2 are arranged at intervals.

[0068] Embodiment 6

[0069] Reference Figure 9 , compared with Embodiment 5, the difference in this embodiment is the structure of the electrode strips 100 of the first electrode sheet 1 and the second electrode sheet 2. In this embodiment, there is no reserved blank area 1011 on the current collectors 101 of the electrode strips 100 of the first electrode sheet 1 and the second electrode sheet 2, and the coating layer 102 of the current collector 101 of each electrode strip 100 is continuous.

[0070] Embodiment 7

[0071] Reference Figures 10 - 12 , the purpose of this embodiment is to manufacture the wound type electric double layer supercapacitor single cell core of the above embodiments, and the method includes:

[0072] First, make two electrode sheets: the first electrode sheet 1 and the second electrode sheet 2 respectively;

[0073] Secondly, stack the electrode sheets and the separator 3 in an alternating manner and wind them with the separator 3 as the outermost layer;

[0074] Finally, after winding, the first capacitor external connection end forms a connection with the end cover 5 after being wrapped and fixed with winding adhesive tape 6, then the battery core is assembled into the outer shell 4, the second capacitor external connection end forms a connection with the bottom cover of the outer shell 4, and electrolyte is filled and sealed to form a closed monomer. Among them, positive and negative terminal 6 and 7 are respectively arranged on the end cover 5 and the bottom cover of the outer shell 4 for connecting to other electronic components externally.

[0075] In summary, the wound type electric double layer supercapacitor monomer battery core and its manufacturing method of the present invention have the following beneficial effects: The present invention changes the structure of a single electrode sheet. The electrode sheet connects two electrode strips through an insulating tape. The energy transfer between the two electrode strips connected by the insulating tape on each electrode sheet is achieved through the electrode strip on another electrode sheet that projects and covers the insulating tape. In this way, the present invention can achieve the series effect equivalent to that of two or more traditional battery cores inside an electric double layer capacitor monomer, break through the bottleneck of low voltage resistance of a single pair of battery core materials, improve the working voltage output by the electric double layer capacitor from the internal design of the monomer battery core, thereby reducing the external series quantity, and meeting the equipment's demand for voltage increase in a smaller volume.

[0076] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0078] The ordinal terms such as "first" and "second" used in this specification can be used to describe various components, but these components are not limited by these terms. The purpose of using these terms is only to distinguish one component from other components. For example, without departing from the scope of the claims of the present invention, the first component can be named the second component, and similarly, the second component can also be named the first component.

[0079] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A wound-type electric double-layer supercapacitor single cell core, characterized in that, The battery cell is cylindrical, formed by winding together electrode sheets and separators in an alternating manner with the separator as the outermost layer, and the number of the electrode sheets is two; The first electrode sheet includes two electrode strips arranged in sequence along a first direction. Among them: the two electrode strips are connected by an insulating strip. One side of the first electrode strip pointing in the opposite direction of the first direction is connected to the first capacitor external connection end, and one side of the second electrode strip pointing in the first direction is connected to the second capacitor external connection end, and the first direction is parallel to the busbar direction of the battery cell; The second electrode sheet includes one electrode strip, and the projection of the electrode strip of the second electrode sheet on the first electrode sheet overlaps with both electrode strips of the first electrode sheet at the same time. The electrode strip of the second electrode sheet is used to store charge and realize energy transfer between the two electrode strips of the first electrode sheet.

2. The wound-type electric double-layer supercapacitor single cell core according to claim 1, characterized in that, The electrode strip includes a current collector and a coating layer coated on one side / both sides of the current collector. The current collector of the first electrode strip in the first electrode sheet extends further in the opposite direction of the first direction to form a blank area without coating as the first capacitor external connection end, and the current collector of the second electrode strip in the first electrode sheet extends further in the first direction to form a blank area without coating as the second capacitor external connection end.

3. The wound-type electric double-layer supercapacitor single cell core according to claim 2, characterized in that, The area on the current collector of the electrode strip of the second electrode sheet covered by the projection of the insulating strip in the first electrode sheet does not need to be coated as a blank area.

4. The wound-type electric double-layer supercapacitor single cell core according to claim 2, characterized in that, The current collector is aluminum foil, and the coating layer includes activated carbon.

5. The wound-type electric double-layer supercapacitor single cell core according to claim 1, characterized in that, The number of separators of the battery cell is two. The second electrode sheet, the first separator, the first electrode sheet, and the second separator are stacked in sequence. The second electrode sheet is the innermost layer during winding, and the second separator is the outermost layer during winding. The length of the separator in the winding direction exceeds that of the electrode sheet in the winding direction to form an insulating effect.

6. A wound-type electric double-layer supercapacitor single cell core, characterized in that, The battery cell is cylindrical, formed by winding together electrode sheets and separators in an alternating manner with the separator as the outermost layer, and the number of the electrode sheets is two. Each electrode sheet includes multiple electrode strips arranged in sequence along a first direction, and adjacent electrode strips are connected by an insulating strip. The projection of the insulating strip in the second electrode sheet on the first electrode sheet is arranged alternately with the insulating strip in the first electrode sheet. The energy transfer between the two electrode strips connected by the insulating strip on each electrode sheet is realized by the electrode strip on the other electrode sheet that projects and covers the insulating strip. The first direction is parallel to the busbar direction of the battery cell. Among them: The number of insulating strips of the two electrode sheets is equal: one side of the first electrode strip of the first electrode sheet pointing in the opposite direction of the first direction is connected to the first capacitor external connection end, and one side of the last electrode strip of the second electrode sheet pointing in the first direction is connected to the second capacitor external connection end; Or, the number of insulating strips of the first electrode sheet is one more than that of the second electrode sheet: one side of the first electrode strip of the first electrode sheet pointing in the opposite direction of the first direction is connected to the first capacitor external connection end, and one side of the last electrode strip of the first electrode sheet pointing in the first direction is connected to the second capacitor external connection end.

7. The wound-type electric double-layer supercapacitor single cell core according to claim 6, characterized in that, The electrode strip includes a current collector and a coating layer coated on one side / both sides of the current collector. The current collector of the first electrode strip in the first electrode sheet extends in the opposite direction of the first direction to form a blank area as the external connection terminal of the first capacitor; When the number of insulating strips of the two electrode sheets is equal, the last electrode strip in the second electrode sheet extends in the first direction to form a blank area as the external connection terminal of the second capacitor; When the number of insulating strips of the first electrode sheet is one more than that of the second electrode sheet, the last electrode strip in the first electrode sheet extends in the first direction to form a blank area as the external connection terminal of the second capacitor.

8. The wound-type electric double-layer supercapacitor single cell core according to claim 7, characterized in that, If the projection of a certain electrode strip on one electrode sheet covers a certain insulating strip on another electrode sheet, there is no need to coat the area on the current collector of the certain electrode strip covered by the projection of the certain insulating strip as a blank area.

9. The wound-type electric double-layer supercapacitor single cell core according to claim 6, characterized in that, The number of diaphragms of the battery cell is two. The second electrode sheet, the first diaphragm, the first electrode sheet, and the second diaphragm are stacked in sequence. The second electrode sheet is the innermost layer during winding, and the second diaphragm is the outermost layer during winding. The length of the diaphragm in the winding direction exceeds the length of the electrode sheet in the winding direction to form an insulating effect.

10. A method for manufacturing a wound-type electric double-layer supercapacitor single cell core for manufacturing the single cell core according to any one of claims 1-9, characterized in that, The method includes: Fabricating two of the electrode sheets; Stacking the electrode sheets and the diaphragms alternately and winding them with the diaphragm as the outermost layer; After winding, the external connection terminal of the first capacitor is connected to the end cap, and then the battery cell is assembled into the housing. The external connection terminal of the second capacitor is connected to the bottom cover of the housing, and electrolyte is filled and sealed to form a closed monomer; wherein, the end cap and the bottom cover of the housing are respectively provided with positive and negative terminals.

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