Super capacitor tab and hybrid super capacitor

Abstract

The embodiment of the utility model discloses a super capacitor tab and a hybrid super capacitor, the super capacitor tab comprises a tab body, the left side edge and the right side edge of the tab body are cambered surfaces, the tab body comprises a head part and a tail part, the tail part adopts a double-layer structure, and the tail part comprises a tail part upper layer and a tail part lower layer. According to the utility model, a double-layer structure is adopted, and the current collector is embedded in the middle hollow part, so that the contact area with the current collector is increased, electron transmission channels are increased, welding is firmer, and internal resistance is smaller; according to the utility model, the cross section of the tab is in the shape of a runway or a rounded rectangle similar ellipse, so that the edge of the tab does not press the diaphragm in the winding process of the cylindrical hybrid super capacitor and does not pierce the diaphragm, and the service life of the hybrid super capacitor is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of supercapacitors, in particular to a supercapacitor tab and a hybrid supercapacitor. Background Art

[0002] Hybrid supercapacitors have broad application prospects in electric vehicles, portable electronic devices, renewable energy systems (such as solar and wind energy storage), industrial equipment, and smart grids. Hybrid supercapacitors have the advantages of high power density, fast charge and discharge, long cycle life, and high efficiency.

[0003] The tab structure of existing hybrid supercapacitors causes strong extrusion on the electrode sheet and the separator. During the large-current charge and discharge process of the supercapacitor, the separator is extremely prone to being punctured at the corresponding position, resulting in capacitor failure and reduced service life. At the same time, during use, phenomena such as electrolyte decomposition and cell swelling will occur.

[0004] Currently, the cross-section of the tab of most cylindrical wound supercapacitors is rectangular and is welded to the current collector. There are two problems. First, only one side of the tab is welded to the current collector, with a small contact area and few electron channels, resulting in a large internal resistance. And there are easily situations such as poor soldering, further increasing the internal resistance and even leading to capacitor failure. Second, during the winding process, the sharp edges of the tab will press the separator (such as Figure 1 regions A and B), and the winding stress will cause the separator to be punctured, resulting in capacitor short-circuit failure. Summary of the Utility Model

[0005] The technical problem to be solved by the embodiments of the utility model is to provide a supercapacitor tab and a hybrid supercapacitor to prevent damage to the separator and poor soldering, and reduce the internal resistance.

[0006] To solve the above technical problem, an embodiment of the utility model provides a supercapacitor tab, including a tab body. The left and right edges of the tab body are arc surfaces. The tab body includes a head and a tail, and the tail adopts a double-layer structure, including an upper layer of the tail and a lower layer of the tail.

[0007] Further, a current collector is embedded between the upper layer of the tail and the lower layer of the tail.

[0008] Further, the cross-sections of the head and the tail are both racetrack-shaped or rounded rectangles.

[0009] Further, the edge at the end of the tail adopts an R-angle structure.

[0010] Correspondingly, an embodiment of the utility model also provides a hybrid supercapacitor, including the above-mentioned supercapacitor tab.

[0011] Further, it further includes a capacitor current collector, and both the upper layer and the lower layer of the tail of the supercapacitor tab are welded to the capacitor current collector.

[0012] The beneficial effects of the present utility model are as follows: The present utility model adopts a double-layer structure, and the hollow part in the middle is embedded with a current collector, which not only increases the contact area with the current collector and increases the electron transmission channels, but also has stronger welding and smaller internal resistance; the cross-section of the present utility model is a kind of oval shape such as a runway shape or a rounded rectangle, and during the winding process of the cylindrical hybrid supercapacitor, the edge of the tab will not oppress the separator and will not pierce the separator, greatly increasing the service life of the hybrid supercapacitor. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of an existing tab.

[0014] Figure 2 It is a front view structural diagram of the supercapacitor tab of the embodiment of the present utility model.

[0015] Figure 3 It is a schematic cross-sectional structural diagram of the tail of the embodiment of the present utility model.

[0016] Figure 4 It is a schematic structural diagram of the supercapacitor tab of the embodiment of the present utility model applied to a pole piece.

[0017] Figure 5 It is a schematic structural diagram when the supercapacitor tab of the embodiment of the present utility model is applied.

[0018] Description of the Reference Numerals in the Drawings

[0019] Tab 1, capacitor current collector 2, active material 3, area A 4, area B 5, pole piece 6, supercapacitor tab 10, head 11, tail 12, upper layer of the tail 13, lower layer of the tail 14, hollow part 15, tab glue 16. Detailed Embodiment

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0021] In the embodiments of the present utility model, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0022] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature.

[0023] Please refer to Figures 2 to 5 , the supercapacitor tab of the embodiment of the present utility model includes a tab body. The tab body includes a head and a tail.

[0024] The left and right edges of the tab body are arc surfaces, such that during the process of winding the electrode sheet into an electrode core, the tab body and the separator on the electrode sheet are always in arc surface contact. The cross-section of the head and the tail is preferably a racetrack shape or a rounded rectangle. In the existing tab structure, after the electrode sheet is wound, due to stress, the electrode sheet and the separator are squeezed. During the process of large current charge and discharge of the hybrid supercapacitor, black spots or even breakage are likely to occur at the corresponding positions, thereby leading to short circuit failure and reducing the service life. Therefore, the present utility model designs the tab into a racetrack shape or a rounded rectangle-like oval shape, which can disperse the pressure between the separator and the electrode sheet at the tab position and prevent the separator at the tab position from being punctured.

[0025] The tail adopts a double-layer structure, and the tail includes an upper layer of the tail and a lower layer of the tail. The upper layer of the tail and the lower layer of the tail can be welded simultaneously, which can increase the welding strength.

[0026] During specific implementation, the width of the tail is 4 mm to 12 mm, and the length is 60 mm to 100 mm; the distance between the middle of the double-layer structure of the tail is 0.05 mm to 0.15 mm.

[0027] As an implementation manner, a current collector is embedded in the hollow part between the upper layer of the tail and the lower layer of the tail. The current collector can increase the contact area, increase the electron channels, and reduce the internal resistance of the supercapacitor tab.

[0028] As an implementation manner, the edge at the end of the tail adopts an R corner structure, as Figure 2 shown, the R corner structures on both sides at the bottom end of the tail.

[0029] The present utility model can avoid the problem that during use, since the sharp right-angle edge of the tab contacts the separator, it is very easy to cause the separator to be damaged, resulting in a short circuit, causing the internal air pressure to be too high, and there is a risk of explosion, thus posing a potential safety hazard to the product. The poor welding between the tab and the electrode sheet will also lead to too high internal resistance and cause the capacitor to fail. The present utility model is convenient for processing and use, and can reduce the internal resistance of the hybrid supercapacitor.

[0030] The hybrid supercapacitor according to the embodiment of the present utility model includes a supercapacitor tab and a capacitor current collector. There are active materials on both sides of the capacitor current collector. The upper layer and the lower layer of the tail of the supercapacitor tab are both welded to the capacitor current collector. The head is bonded with tab glue.

[0031] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. A supercapacitor tab, comprising a tab body, characterized in that, The left and right edges of the tab body are arc surfaces. The tab body includes a head and a tail, and the tail adopts a double-layer structure, which includes an upper layer of the tail and a lower layer of the tail.

2. The tab of the supercapacitor according to claim 1, characterized in that, A current collector is embedded between the upper layer of the tail and the lower layer of the tail.

3. The tab of the supercapacitor according to claim 2, wherein The cross-sections of both the head and the tail are in the shape of a racetrack or a rounded rectangle.

4. The supercapacitor tab according to claim 1, wherein The edge at the end of the tail adopts an R-corner structure.

5. A hybrid supercapacitor, characterized in that, It includes a supercapacitor tab as described in any one of claims 1-4.

6. The hybrid supercapacitor according to claim 5, wherein, It further includes a capacitor current collector, and both the upper layer of the tail and the lower layer of the tail of the supercapacitor tab are welded to the capacitor current collector.

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