Cylindrical supercapacitor with positive electrode and negative electrode located on same side of roll core and processing technology

Abstract

The invention discloses a cylindrical supercapacitor with a positive electrode and a negative electrode located on the same side of a roll core and a processing technology. The cylindrical supercapacitor comprises a shell, the roll core arranged in the shell and a cover plate arranged on the opening side of the shell. A roll core center hole is formed in the center of the roll core, and a negative pole column containing a liquid injection hole is arranged on the cover plate; a positive tab and a negative tab are arranged on the end face, close to the cover plate, of the roll core, surround a center hole of the roll core and are symmetrically arranged, the positive tab and the negative tab are arranged in an annular structure composed of discontinuous arc sections, and the negative tab is located on the inner side of the annular structure. A gap for placing an insulating ring is reserved between the outer edge part of the negative tab and the inner edge part of the positive tab on the outer side of the annular structure; the positive pole lug and the negative pole lug are respectively and correspondingly provided with a positive pole current collecting disc and a negative pole current collecting disc, the positive pole current collecting disc is connected with the upper edge of the slot rolling position on the inner wall of the shell, and the negative pole current collecting disc is connected with a cover plate provided with a negative pole column.

Description

Technical Field

[0001] The present invention belongs to the technical field of supercapacitors, and in particular relates to a cylindrical supercapacitor with positive and negative electrodes located on the same side of a winding core and a processing technology thereof. Background Art

[0002] Supercapacitors, also known as electrochemical capacitors, are devices that store electrical energy based on the interface formed between electrodes and electrolytes. They are new green energy storage devices between conventional capacitors and secondary batteries. Supercapacitors have the characteristics of high specific capacitance, wide operating voltage range, environmental friendliness, high energy density and high power density. They have the high power output of traditional capacitors and the charge storage capacity of secondary batteries. At present, supercapacitors are widely used in short-term high-power energy storage fields such as power frequency modulation and wind turbine pitch control. They have the advantages of long life, low internal resistance, high power density, fast charging and discharging speed, and wide operating temperature range. However, large cylindrical supercapacitors on the market usually adopt a structure with different positive and negative ends. Specifically, supercapacitor cells with positive and negative ears at both ends are formed by winding. After the positive and negative ears at both ends are shaped, they are welded to the positive and negative current collecting plates respectively, and then welded to the shell and aluminum cover to finally achieve the purpose of sealing. However, the above-mentioned heterogeneous supercapacitors have the following problems: (1) The two ends of the winding core are continuous tabs, and the closed end faces formed after shaping have a negative impact on the immersion of the electrolyte, reducing the electrolyte infiltration effect and prolonging the injection time. (2) The heterogeneous structure of the positive and negative poles is extremely inconvenient in the field of electronic circuit applications where the positive and negative poles need to be placed at the same end. (3) The way the tabs are arranged at both ends of the winding core will reduce the space utilization of the cylindrical capacitor in the height direction and reduce the energy density.

[0003] In order to solve the problem of large-capacity capacitors with heterodyne structures mentioned above, researchers have developed a large-capacity supercapacitor with positive and negative poles located on the same side of the core. Traditional supercapacitors with same-side tabs extend positive and negative poles on the same side, which can easily cause interference during welding, and can easily cause short circuits in the battery due to accidental contact during subsequent use, posing a safety risk. Chinese patent application CN218957872U discloses a power energy storage device with a positive and negative pole on the same side structure. The positive and negative poles of the device are located at both ends of the battery cell and are connected to the positive and negative current collecting plates respectively. The positive terminal is located at the bottom and connected to the shell, the negative pole is located at the top cover, and a positive pole is provided next to the top cover to realize the positive and negative poles on the same side structure. However, in this patent application, the positive and negative poles are located on different sides of the core, which fails to fully improve the space utilization in the height direction of the cylinder. Summary of the Invention

[0004] The purpose of the present invention is to provide a cylindrical supercapacitor with positive and negative electrodes located on the same side of the winding core and a processing technology to solve the problems existing in the prior art. The cylindrical supercapacitor structure with positive and negative electrodes on the same side of the present invention effectively improves the space utilization rate in the height direction inside the cylindrical supercapacitor, increases the energy density of the supercapacitor, and reduces the production cost of the product.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A cylindrical supercapacitor with positive and negative electrodes located on the same side of a winding core, comprising a housing, a winding core disposed within the housing, and a cover disposed on the opening side of the housing; a winding core center hole is disposed at the center of the winding core, and a negative electrode post with a liquid injection hole is disposed on the cover; A positive electrode ear and a negative electrode ear are provided on the end surface of the winding core close to the cover plate, and the positive electrode ear and the negative electrode ear are symmetrically arranged around the central hole of the winding core, and the positive electrode ear and the negative electrode ear are arranged in a circular ring structure composed of discontinuous arc segments, and the negative electrode ear is located on the inner side of the circular ring structure, and a gap for placing an insulating ring is reserved between the outer edge of the negative electrode ear and the inner edge of the positive electrode ear located outside the circular ring structure; a positive electrode collecting disk and a negative electrode collecting disk are respectively provided on the positive electrode ear and the negative electrode ear, and the positive electrode collecting disk is connected to the upper edge of the rolling groove position on the inner wall of the shell, and the negative electrode collecting disk is connected to the cover plate provided with the negative electrode post.

[0006] Furthermore, the central angle corresponding to each arc segment is 10°~120°.

[0007] Furthermore, the negative electrode ear includes several negative electrode ear bodies of the same size, the negative electrode ear bodies are pointed from the center 0~5mm position of the winding core in the winding diameter direction, the winding stack thickness is 3~10mm, and they are arranged in a ring shape of discontinuous arc segments. The shaped negative electrode ear has a circular ring structure composed of discontinuous arc segments.

[0008] Furthermore, the positive electrode tab includes several positive electrode tab bodies of the same size, which are pointed from the center of the winding core at a position of 5 to 25 mm to the edge of the winding core, with a winding stack thickness of 3 to 10 mm and a ring arrangement of discontinuous arc segments. The shaped positive electrode tab has a circular ring structure composed of discontinuous arc segments.

[0009] Furthermore, the arrangement plane of the negative electrode ear and the positive electrode ear is a concentric circle composed of discontinuous arc segments, and the negative electrode ear in the inner circle is 2 to 15 mm higher than the positive electrode ear in the outer circle, and the gap width between the outer edge of the negative electrode ear and the inner edge of the positive electrode ear is 2 to 20 mm.

[0010] Furthermore, the positive electrode current collecting disc and the negative electrode current collecting disc are both circular structures. The positive electrode current collecting disc is electrically connected to the positive electrode tab, and the negative electrode current collecting disc is electrically connected to the negative electrode tab.

[0011] Furthermore, the positive electrode current collecting disc has an outer edge protrusion extending outward, and the outer edge protrusion is connected to the upper edge of the groove position on the inner wall of the shell by laser welding; the outer ring of the negative electrode current collecting disc is provided with a protrusion, and the protrusion is connected to the cover plate by circumferential welding.

[0012] Furthermore, the center hole of the negative electrode current collecting disc is recessed inward to form an inner concave portion, and the inner concave portion matches the center hole of the winding core to fix and position the negative electrode current collecting disc.

[0013] Furthermore, an insulating isolation collar is provided on the outer edge of the cover plate, and the cover plate and the shell are isolated by the insulating isolation collar when they are matched.

[0014] A processing technology for a cylindrical supercapacitor with positive and negative electrodes located on the same side of a winding core comprises extending a positive electrode ear and a negative electrode ear from the same end face of the winding core, so that the positive electrode ear and the negative electrode ear form a concentric ring structure with discontinuous arc segments, fixing the stacked positive electrode ear and the negative electrode ear, and shaping the positive electrode ear and the negative electrode ear so that the shaped positive electrode ear and the negative electrode ear maintain the concentric ring structure with discontinuous arc segments; laser welding the positive electrode collector disc and the negative electrode collector disc in sequence, placing an insulating ring in the gap between the positive electrode ear and the negative electrode ear, then circumferentially welding the negative electrode collector disc and the cover plate to incorporate into the shell; and laser welding the positive electrode collector disc to the upper edge of the grooved portion of the inner wall of the shell for a circle after groove rolling; and placing an insulating isolation ring on the cover plate and sealing it so that the cover plate and the shell form an integrated structure. The core is then baked and injected with liquid. After the injection is completed, the sealing plug is pressed into the injection hole set on the cover plate, and the sealing pin is sealed to the injection hole by laser welding to form a cylindrical supercapacitor with the positive and negative electrodes located on the same side of the core.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention extends the positive and negative ears on the same side of the core, thereby improving the space utilization in the height direction of the core and increasing the energy density of the supercapacitor; compared with the supercapacitor with two poles on the same side, the positive and negative ears extend on the same side of the core in the present invention, and the supercapacitor itself has two poles, the shell and the bottom positive pole are the positive pole of the supercapacitor, and the cover plate is the negative pole of the supercapacitor, so the safety is better guaranteed; the positive and negative ears of the present invention adopt a multi-arc concentric ring structure, which provides more channels for the infiltration of the electrolyte and improves the seepage efficiency of the supercapacitor with poles on the same side.

[0016] The processing technology of the cylindrical supercapacitor provided by the present invention, in which the positive and negative ears are located on the same side of the winding core, is simple and feasible, and greatly reduces the process cost. By extending the positive and negative ears on the same side of the supercapacitor winding core, the space utilization in the height direction of the winding core is improved, and the energy density is improved; at the same time, the positive current collecting disk is connected to the upper edge of the groove portion of the inner wall of the shell by laser circumferential welding, and the outer ring protrusion of the negative current collecting disk is connected to the cover plate by circumferential welding. The design of only one negative pole on the cover plate greatly ensures its safety. In addition, the current flow path is short, which effectively reduces the internal resistance of the capacitor.

[0017] The insulating isolation collar structure provided by the present invention can effectively isolate the contact between the positive electrode and the negative electrode cover, thereby further improving the safety of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of a cylindrical supercapacitor with the positive and negative electrodes located on the same side of the winding core according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the cylindrical supercapacitor core structure in which the positive and negative electrodes are located on the same side of the core according to the present invention; Figure 3 Schematic diagram of the positive and negative tab insulation isolation rings of the present invention; Figure 4 This is a schematic diagram of the structure of the positive electrode current collecting disk of the present invention; Figure 5 Schematic diagram of the structure of the negative electrode current collecting disk of the present invention; Figure 6 Schematic top view of the insulating isolation ring structure of the present invention; Figure 7 It is a side view schematic diagram of the insulating isolation collar structure of the present invention.

[0020] Among them, 1-shell; 101-positive electrode column; 2-winding core; 201-positive electrode ear; 202-negative electrode ear; 203-winding core center hole; 3-cover plate; 301-negative electrode column; 302-liquid injection hole; 4-insulating ring; 5-positive electrode current collecting plate; 501-outer edge protrusion; 502-positive electrode side liquid injection guide hole; 6-negative electrode current collecting plate; 601-inner concave part; 602-protrusion; 603-negative electrode side liquid injection guide hole; 7-insulating isolation ring. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] Example 1 In the first aspect, the present invention provides a cylindrical supercapacitor with positive and negative tabs located on the same side of the core, comprising a housing 1, a core 2 disposed in the housing 1, and a cover plate 3 disposed on the open side of the end of the housing 1, for sealing the core 2 into the housing 1, wherein the cover plate 3 is provided with a negative electrode post 301 having a liquid injection hole 302; a positive tab 201 and a negative tab 202 extend from one end surface of the core 2 at the same time, the positive tab 201 and the negative tab 202 are symmetrically arranged around the central hole 203 of the core, and the positive tab 201 and the negative electrode ear 202 are arranged in a circular structure composed of discontinuous arc segments. The negative electrode ear 202 is located on the inner side of the circular structure, and a gap for placing the insulating ring 4 is reserved between the outer edge of the negative electrode ear 202 and the inner edge of the positive electrode ear 201 located on the outer ring; the positive electrode ear 201 and the negative electrode ear 202 are respectively provided with a positive electrode collecting plate 5 and a negative electrode collecting plate 6. The positive electrode collecting plate 5 is connected to the upper edge of the rolling groove on the inner wall of the shell 1, and the negative electrode collecting plate 6 is connected to the cover plate 3 provided with the negative electrode column 301.

[0025] Preferably, the positive electrode ear 201 and the negative electrode ear 202 are concentric ring symmetrical structures composed of multiple discontinuous arc segments with the central hole 203 of the winding core as the center of the circle, and the central angle of each arc segment is 10°~120°. The negative electrode ear 202 includes several negative electrode ear bodies of the same size, and the negative electrode ear body points from the 0~5mm position of the center of the winding core 2 to the winding diameter direction, and the winding stacking thickness is 3~10mm, and is arranged in a ring shape of discontinuous arc segments. After shaping, the negative electrode ear 202 has a circular ring structure composed of discontinuous arc segments; the positive electrode ear 201 includes several positive electrode ear bodies of the same size, and the positive electrode ear body points from the 5~25mm position of the center of the winding core to the edge position of the winding core, and the winding stacking thickness is 3~10mm, and is arranged in a ring shape of discontinuous arc segments. After shaping, the positive electrode ear 201 has a circular ring structure composed of discontinuous arc segments.

[0026] Preferably, the arrangement plane of the negative electrode tabs 202 and the positive electrode tabs 201 is a discontinuous arc segment concentric circle, and the inner circle of the negative electrode tabs 202 is 2-15 mm higher than the positive electrode tabs 201 .

[0027] Preferably, there is a gap between the outer edge of the annular arc segment of the negative electrode ear and the inner edge of the annular arc segment of the positive electrode ear to form an electrolyte circulation space, and an insulating ring 4 is built into the gap to effectively isolate the positive and negative electrodes, and the gap width is 2 to 20 mm.

[0028] Preferably, the positive current collecting disc 5 and the negative current collecting disc 6 are both circular structures, and the center hole of the negative current collecting disc 6 is recessed inward to form an inner recess 601 . The positive current collecting disc 5 is electrically connected to the positive electrode tab 201 , and the negative current collecting disc 6 is electrically connected to the negative electrode tab 202 .

[0029] Preferably, the positive electrode current collecting disc 5 has an outer edge protrusion 501 extending outward, and the outer edge protrusion 501 is connected to the upper edge of the groove of the inner wall of the shell 1 by laser welding, and finally connected to the pole on the shell 1, that is, the positive electrode pole 101.

[0030] Preferably, the inner recess 601 in the center of the negative electrode current collecting disc 6 matches the center hole 203 of the winding core, which can fix and position the negative electrode current collecting disc 6. At the same time, the outer ring of the negative electrode current collecting disc 6 is provided with a protrusion 602, which is connected to the cover plate 3 by circumferential welding and finally connected to the pole on the cover plate 3, that is, the negative electrode pole 301.

[0031] Preferably, an insulating ring 4 is placed between the positive electrode current collecting disc 5 and the negative electrode current collecting disc 6 to isolate the positive and negative electrodes and support the electrodes.

[0032] In a second aspect, the present invention further provides a process for manufacturing a cylindrical supercapacitor with positive and negative tabs located on the same side of a winding core, comprising: After winding, the same end face of the winding core 2 is extended with a positive electrode ear 201 and a negative electrode ear 202. The positive electrode ear 201 and the negative electrode ear 202 are in a concentric ring structure with discontinuous arc segments. The positive electrode ear 201 and the negative electrode ear 202 are fixedly stacked by a jig, and the positive electrode ear 201 and the negative electrode ear 202 are shaped. After the shaping, the positive electrode ear 201 and the negative electrode ear 202 maintain the concentric ring structure of the discontinuous arc segments; after the positive electrode collector plate 5 and the negative electrode collector plate 6 are laser welded in sequence, an insulating ring 4 is placed in the gap between the positive electrode ear 201 and the negative electrode ear 202, and then the negative electrode collector plate 6 of the negative electrode of the winding core is circumferentially welded to the cover plate 3 and The shell 1 is inserted into the winding core 2, and after the groove is rolled, the positive current collecting disk 5 is extended and overlapped with the upper edge area of ​​the groove of the inner wall of the shell, and laser welding is performed for one circle; the insulating isolation ring 7 is put on the cover plate 3 and sealed to make the cover plate 3 and the shell 1 an integrated structure, the winding core 2 is baked and injected with liquid, and the sealing plug is pressed into the injection hole 302 provided on the cover plate 3, and the sealing pin is sealed in the injection hole 302 by laser welding, and processed into a cylindrical supercapacitor with the positive and negative ears located on the same side of the winding core. The shell 1 and the positive electrode column 101 provided with the shell 1 are the positive electrode of the capacitor, and the cover plate 3 and the negative electrode column 301 provided on the cover plate 3 are the negative electrode of the capacitor.

[0033] Example 2 See also Figures 1 to 5 As shown, this embodiment provides a cylindrical supercapacitor with positive and negative tabs located on the same side of a winding core, comprising a housing 1, a winding core 2 disposed within the housing 1, and a cover plate 3 covering the open end of the housing 1, the cover plate 3 being used to seal the winding core 2 within the housing 1; A positive electrode tab 201 and a negative electrode tab 202 extend from one end face of the winding core 2. The positive electrode tab 201 and the negative electrode tab 202 are symmetrically arranged around the central hole 203 of the winding core. The positive electrode tab 201 and the negative electrode tab 202 are arranged in a concentric circular ring structure with discontinuous arc segments. The negative electrode tab 202 is located in the inner circle and is higher than the positive electrode tab 201. A gap is reserved between the edges of the positive electrode tab 201 and the negative electrode tab 202 for placing the insulating ring 4. A positive current collecting plate 5 and a negative current collecting plate 6 are respectively provided on the positive electrode ear 201 and the negative electrode ear 202. The positive current collecting plate 5 is connected to the upper edge of the rolling groove on the inner wall of the shell 1. The negative current collecting plate 6 is connected to the cover plate 3 through the protrusion 602 provided thereon. The cover plate 3 has a negative electrode post 301, and the negative electrode post 301 is provided with a liquid injection hole 302.

[0034] Specifically, in this embodiment, the positive and negative electrode sheets containing hollow foil are wound to form a cylindrical supercapacitor core 2 with the positive and negative electrode ears located on the same side. The positive electrode ear 201 and the negative electrode ear 202 of the core 2 extend from the same end, forming a concentric ring structure composed of discontinuous arc segments. The inner arc segment of the concentric ring structure is the negative electrode ear 202, and the outer arc segment is the positive electrode ear 201. This discontinuous gap structure provides more liquid seepage channels for liquid injection. The positive current collecting disk 5 is laser welded to the upper edge of the groove position on the inner wall of the shell 1 (an aluminum shell in this embodiment). The negative current collecting disk 6 is connected to the cover plate 3 (an aluminum cover plate in this embodiment) by laser circumferential welding through the protrusion 602. After the insulating isolation ring 7 is put on the cover plate 3, the cylindrical supercapacitor with the positive and negative electrode ears located on the same side of the core is formed after sealing, thereby improving the space utilization of the core 2 in the height direction and improving the energy density.

[0035] Furthermore, the positive tab 201 and the negative tab 202 are located on the same side of the core 2, which can improve the space utilization of the core 2 in the height direction. Compared with the supercapacitor core with tabs at different ends, the space utilization in the height direction is increased by more than 5%.

[0036] The cylindrical supercapacitor described in this embodiment has positive and negative electrodes located on the same side of the core. By providing tabs on the same side of the positive and negative electrodes of the supercapacitor core 2, the space utilization in the height direction of the core 2 is improved, thereby increasing the energy density. At the same time, the positive current collecting disc 5 is laser-welded to the shell 1, and the negative current collecting disc 6 is connected to the cover plate 3 through its own protrusion 602. There is only one negative electrode post 301 on the cover plate 3, which greatly ensures its safety. In addition, the current flow path is short, effectively reducing the internal resistance of the battery.

[0037] In some embodiments, as Figure 2 As shown, the positive tab 201 and the negative tab 202 are arranged in concentric rings. Specifically, in this embodiment, the positive tab 201 and the negative tab 202 are arranged in a circular ring structure consisting of discontinuous arc segments, with the arc segments corresponding to central angles of 10° to 120°. This can provide more diversion paths for the electrolyte to penetrate deeply. If the requirements for tab welding strength are weak, the length and number of the tab arc segments can be appropriately reduced.

[0038] In some embodiments, as Figure 2 As shown, the negative electrode ear 202 includes a plurality of negative electrode ear bodies, which are radially arranged at a position 0 to 5 mm away from the center hole of the winding core 2. The negative electrode ear bodies are wound and stacked with a thickness of 5 to 10 mm, and are arranged in a discontinuous annular divergent manner. After shaping, the negative electrode ear 202 has a circular ring structure composed of arc segments; the positive electrode ear 201 includes a plurality of positive electrode ear bodies, which are radially arranged at a position 5 to 25 mm away from the center hole of the winding core 2. The positive electrode ear bodies are wound and stacked with a thickness of 5 to 10 mm, and are arranged in a discontinuous annular structure. After shaping, the negative electrode ear 201 has a circular ring structure composed of arc segments.

[0039] Gaps are reserved between the positive and negative tabs 201 and 202, as well as between the tab arc segments. The gap width is 2 to 15 mm to form sufficient space for the electrolyte to flow. Insulating rings 4 can be placed in the gap between the positive and negative tabs 201 and 202 to prevent deformation and contact of the positive and negative tabs 201 and 202, which may cause safety problems.

[0040] Specifically, in this embodiment, the positive and negative electrode sheets containing hollow foil are wound to form a cylindrical supercapacitor core 2 with the positive and negative electrode ears on the same side. The positive electrode ear 201 and the negative electrode ear 202 of the core 2 extend from the same end, presenting a concentric ring structure composed of discontinuous arc segments. The inner arc segment of the concentric ring is the negative electrode ear 202, which is 6~10mm away from the center hole, the arc segment corresponds to a central angle of 30~90°, and the arc segment ear thickness is 5~10mm; the outer arc segment is the positive electrode ear 201, which is 12~25mm away from the center hole, the fan-shaped angle formed by the arc segment is 30~90°, the arc segment ear thickness is 5~10mm, and extends to the edge of the core 2.

[0041] The negative electrode tab 202 is 3 to 10 mm higher than the positive electrode tab 201 so that the positive and negative electrodes do not interfere with each other during shaping and welding.

[0042] In some embodiments, as Figure 1 、 Figure 4 and Figure 5 As shown, the positive current collecting disc 5 and the negative current collecting disc 6 are both arranged in a circular structure, and the negative current collecting disc 6 is recessed inward at the edge position near the center hole 203 of the winding core to form an inner recess 601, and the outer ring of the negative current collecting disc is provided with an upward protrusion 602. The positive current collecting disc 5 is arranged in a circular ring structure, and the edge is radially protruded outward near the edge position of the winding core 2 to form an outer edge protrusion 501. The negative current collecting disc 6 is electrically connected to the negative electrode ear 202 and the cover plate 3, and the positive electrode collecting disc 5 is electrically connected to the positive electrode ear 201 and the groove position on the inner wall of the shell 1.

[0043] Specifically, the positive electrode current collecting plate 5 adopts a circular design with an inner ring diameter of 13~25mm, a positive electrode side liquid injection guide hole 502 is provided on the plane, and an outer edge protrusion 501 extending outward is provided on the outer edge of the circular ring to facilitate laser welding connection with the upper edge of the rolling groove part of the shell 1; the negative electrode current collecting plate 6 adopts a circular design, the center hole is concave downward to form an inner concave part 601, which is buckled downward into the center hole 203 of the winding core, and a negative electrode side liquid injection guide hole 603 is provided on the circular surface, and an upward protrusion 602 is provided on the outer ring to be connected to the cover plate 3 by laser circumferential welding. The positive electrode ear 201 and the negative electrode ear 202 are on the same side of the winding core 2, which can improve the space utilization rate of the winding core 2 in the height direction. Compared with the battery with the ear ears on the opposite side, its height space utilization rate is increased by more than 5%.

[0044] In some embodiments, as Figure 1 and Figure 4 、 Figure 5 As shown, the positive current collecting disc 5 has an outer edge protrusion 501 extending outward, which is connected to the upper edge of the groove on the inner wall of the shell 1 by laser. The upward protrusion 602 set on the outer ring of the negative current collecting disc 6 is electrically connected to the cover plate 3 by circumferential welding. Then the insulating isolation ring 7 is put on the cover plate 3, and then the core 2 is sealed to the shell 1 by sealing. The shell 1 and the cover plate 3 are connected as a whole to form a cylindrical supercapacitor with the positive and negative poles located on the same side of the core. The shell 1 and the positive electrode column 101 set with the shell 1 are the positive pole of the capacitor, and the cover plate 3 and the negative electrode column 301 set on the cover plate 3 are the negative pole of the capacitor.

[0045] Specifically, the outer side of the positive electrode current collecting disc 5 is extended in an outward-turned form to form an outer edge protrusion 501, which extends a distance to fit closely to the upper edge of the groove of the shell wall and is connected to the shell 1 by laser welding. The current flows through a short distance, effectively reducing the problem of increased internal resistance of the battery caused by the current flowing through the entire shell 1 (reduced by more than 10%).

[0046] In some embodiments, as Figure 5 As shown, the outer ring of the negative electrode current collecting plate 6 is provided with a protrusion 602 for connecting to the cover plate 3, and a negative electrode side liquid injection guide hole 603 is provided in the plane. The negative electrode side liquid injection guide hole 603 can also assist in locating the welding position and is used to connect the negative electrode ear 202.

[0047] Specifically, in this embodiment, a protrusion 602 is provided on the outer ring of the negative electrode current collecting disc 6 to facilitate circumferential laser welding with the cover plate 3. At the same time, an inner recess 601 is provided on the plane of the negative electrode current collecting disc 6 to adapt to the center hole 203 of the winding core and is concave downward to facilitate the concentricity positioning of the negative electrode current collecting disc 6 and the winding core 2. Furthermore, a laser welding slot is provided on the plane of the negative electrode collecting disc 6.

[0048] In some embodiments, as Figure 2 As shown, after the protrusion 602 on the negative electrode current collecting disc 6 and the cover plate 3 are circumferentially welded, an insulating isolation ring 7 is placed around the outer ring of the cover plate 3 to complete the sealing of the supercapacitor.

[0049] Based on the same inventive concept, corresponding to any of the above embodiments of the cylindrical supercapacitor in which the positive and negative electrodes are located on the same side of the winding core, the present invention also provides a processing method for a cylindrical supercapacitor in which the positive and negative electrodes are located on the same side of the winding core, comprising the following steps: Step S101: Place the wound core 2 into a tab fixing fixture, flatten or knead the positive tab 201 and the negative tab 202. After shaping, the surfaces of the positive tab 201 and the negative tab 202 are flat and compact, forming a concentric ring structure composed of discontinuous arc segments.

[0050] Step S102 : After welding the positive electrode current collecting disc 5 and the negative electrode current collecting disc 6 to the winding core 2 in sequence, an insulating ring 4 is placed in the reserved gap between the positive electrode tab 201 and the negative electrode tab 202 , and then the cover plate 3 and the negative electrode current collecting disc 6 are circumferentially welded.

[0051] Step S103 , the welded winding core 2 is loaded into the shell 1 for grooving, and the outer portion of the positive electrode current collecting plate 5 is connected to the inner wall of the shell in the grooving area by laser welding for one circle.

[0052] Step S104: Place the insulating ring 7 and seal it so that the cover 3 and the housing 1 are an integrated structure. Figure 6 and Figure 7 shown.

[0053] Step S105: Liquid is injected into the winding core 2 through the liquid injection hole 302 on the cover plate 3, and a rubber plug is pressed in. The sealing pin is then sealed in the liquid injection hole 302 by laser welding, completing the sealing process of the cylindrical supercapacitor with the positive and negative poles located on the same side of the winding core. The shell 1 and the positive electrode 101 set with the shell 1 are the positive pole of the capacitor, and the cover plate 3 and the negative electrode 301 set on the cover plate 3 are the negative pole of the capacitor.

[0054] The processing technology of the above embodiment is used to realize the cylindrical supercapacitor in which the positive and negative electrodes are located on the same side of the winding core in any of the above embodiments, and has the beneficial effects of the corresponding supercapacitor device embodiment, which will not be repeated here.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A cylindrical supercapacitor with positive and negative electrodes located on the same side of the winding core, characterized in that: It comprises a shell (1), a winding core (2) arranged in the shell (1), and a cover plate (3) arranged on the opening side of the shell (1); a winding core center hole (203) is provided at the center position of the winding core (2), and a negative electrode pole (301) including a liquid injection hole (302) is provided on the cover plate (3); The end surface of the winding core (2) close to the cover plate (3) is provided with a positive electrode ear (201) and a negative electrode ear (202), the positive electrode ear (201) and the negative electrode ear (202) surround the central hole (203) of the winding core and are symmetrically arranged, and the positive electrode ear (201) and the negative electrode ear (202) are arranged in a circular ring structure composed of discontinuous arc segments, the negative electrode ear (202) is located on the inner side of the circular ring structure, and the outer edge of the negative electrode ear (202) is A gap for placing an insulating ring (4) is reserved between the positive electrode ear (201) and the inner edge of the positive electrode ear (201) located outside the annular structure; a positive electrode current collecting disk (5) and a negative electrode current collecting disk (6) are respectively provided on the positive electrode ear (201) and the negative electrode ear (202); the positive electrode current collecting disk (5) is connected to the upper edge of the groove position of the inner wall of the shell (1), and the negative electrode current collecting disk (6) is connected to the cover plate (3) provided with the negative electrode column (301).

2. A cylindrical supercapacitor with positive and negative electrodes located on the same side of the winding core according to claim 1, characterized in that: The central angle corresponding to each arc segment is 10°~120°.

3. The cylindrical supercapacitor with the positive and negative electrodes located on the same side of the winding core according to claim 1, characterized in that: The negative electrode ear (202) comprises a plurality of negative electrode ear bodies of the same size, wherein the negative electrode ear bodies are directed from the center 0-5 mm position of the winding core (2) in the winding diameter direction, the winding stack thickness is 3-10 mm, and the negative electrode ear (202) is arranged in a ring shape of discontinuous arc segments. The shaped negative electrode ear (202) has a circular ring structure composed of discontinuous arc segments.

4. A cylindrical supercapacitor with positive and negative electrodes located on the same side of the winding core according to claim 3, characterized in that: The positive electrode ear (201) comprises a plurality of positive electrode ear bodies of the same size, the positive electrode ear bodies being arranged from a position 5 to 25 mm from the center of the winding core (2) to an edge of the winding core, with a winding stack thickness of 3 to 10 mm and a ring arrangement of discontinuous arc segments. The shaped positive electrode ear (201) is a circular ring structure composed of discontinuous arc segments.

5. The cylindrical supercapacitor with the positive and negative electrodes located on the same side of the winding core according to claim 1, characterized in that: The arrangement plane of the negative electrode ear (202) and the positive electrode ear (201) is a concentric circle composed of discontinuous arc segments, and the negative electrode ear (202) in the inner circle is 2 to 15 mm higher than the positive electrode ear (201) in the outer circle, and the gap width between the outer edge of the negative electrode ear (202) and the inner edge of the positive electrode ear (201) is 2 to 20 mm.

6. A cylindrical supercapacitor with positive and negative electrodes located on the same side of the winding core according to claim 1, characterized in that: The positive electrode current collecting disc (5) and the negative electrode current collecting disc (6) are both circular structures. The positive electrode current collecting disc (5) is electrically connected to the positive electrode tab (201), and the negative electrode current collecting disc (6) is electrically connected to the negative electrode tab (202).

7. A cylindrical supercapacitor with positive and negative electrodes located on the same side of the winding core according to claim 6, characterized in that: The positive electrode current collecting disc (5) has an outer edge protrusion (501) extending outward, and the outer edge protrusion (501) is connected to the upper edge of the groove position of the inner wall of the shell (1) by laser welding; the outer ring of the negative electrode current collecting disc (6) is provided with a protrusion (602), and the protrusion (602) is connected to the cover plate (3) by circumferential welding.

8. The cylindrical supercapacitor with the positive and negative electrodes located on the same side of the winding core according to claim 6, characterized in that: The central hole of the negative electrode current collecting disc (6) is recessed inward to form an inner concave portion (601), and the inner concave portion (601) matches the central hole (203) of the winding core to fix and position the negative electrode current collecting disc (6).

9. The cylindrical supercapacitor with the positive and negative electrodes located on the same side of the winding core according to claim 1, characterized in that: An insulating isolation collar (7) is provided on the outer edge of the cover plate (3), and the cover plate (3) and the housing (1) are isolated by the insulating isolation collar (7) when they are fitted together.

10. A process for manufacturing a cylindrical supercapacitor with positive and negative electrodes located on the same side of a winding core according to any one of claims 1 to 9, characterized in that: The positive electrode ear (201) and the negative electrode ear (202) are extended from the same end surface of the winding core (2) obtained after winding, so that the positive electrode ear (201) and the negative electrode ear (202) are in a concentric ring structure of a discontinuous arc segment, the stacked positive electrode ear (201) and the negative electrode ear (202) are fixed, and the positive electrode ear (201) and the negative electrode ear (202) are shaped, and the shaped positive electrode ear (201) and the negative electrode ear (202) maintain the concentric ring structure of the discontinuous arc segment; the positive electrode current collecting plate is fixed. (5) After the negative electrode current collecting disc (6) is laser welded in sequence, an insulating ring (4) is placed in the gap between the positive electrode ear (201) and the negative electrode ear (202), and then the negative electrode current collecting disc (6) and the cover plate (3) are circumferentially welded and incorporated into the shell (1). After the groove is rolled, the upper edge area of ​​the groove portion of the positive electrode current collecting disc (5) that overlaps the inner wall of the shell (1) is laser welded for one circle; the insulating isolation ring (7) is put on the cover plate (3) and sealed, so that the cover plate (3) and the shell (1) are an integrated structure; The winding core (2) is then baked and injected with liquid. After the injection is completed, the sealing rubber plug is pressed into the injection hole (302) provided on the cover plate (3), and the sealing pin is sealed to the injection hole (302) by laser welding, thereby processing the cylindrical supercapacitor with the positive and negative electrodes located on the same side of the winding core.

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