Capacitor with positive electrode and negative electrode at same end

Abstract

The utility model relates to the field of battery capacitors, in particular to a capacitor with positive and negative poles at the same end, which comprises a shell, an upper cover, a positive pole confluence plate, a negative pole confluence plate and a roll core, the upper cover comprises an upper cover body, a positive electrode leading-out terminal, a negative electrode leading-out terminal and a negative electrode confluence plate connecting plate; the upper cover body is connected with the shell, a mounting hole is formed in the upper cover body, the negative electrode leading-out terminal penetrates through the mounting hole, the negative electrode leading-out terminal and the upper cover body are riveted, a sealing insulation ring is arranged between the negative electrode leading-out terminal and the upper cover body, and the negative electrode leading-out terminal is connected with the negative electrode confluence plate connecting plate; the cathode confluence plate is connected with the cathode confluence plate connecting plate; the anode leading-out terminal is arranged on the upper cover body; the anode confluence plate is connected with the inner bottom of the shell; a liquid injection hole penetrating through the positive electrode convergence disc is formed in the bottom of the shell, and a sealing part for sealing the liquid injection hole is arranged in the liquid injection hole. By adopting the technical scheme, the stability of the positive and negative electrode structure of the capacitor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery capacitor, concretely relates to a capacitor with positive and negative electrodes in the same end. BACKGROUND

[0002] The super capacitor is a kind of power supply between traditional capacitor and battery, has special performance, mainly relies on double electric layer and oxidation-reduction capacitor charge and stores electric energy.In its energy storage process, no chemical reaction occurs, and this energy storage process is reversible.Because of its high power density, long cycle service life and fast charging speed, it has broad development prospects in the field of thermal power generation, new energy power generation, power frequency modulation, electric vehicle and military field.

[0003] The laser welding type structure of the existing super capacitor is mostly the cylindrical structure with the diameter of 60mm with positive and negative electrodes in different ends.The super capacitor with this structure has large energy storage, small internal resistance and large specific power, and is widely used in military, new energy, energy storage and other fields.But the super capacitor with this structure has large volume, and the module formed by connecting it in series and parallel is not convenient to apply to the scene with limited space and high volume ratio energy, and it is extremely inconvenient for the application occasion in which the positive and negative electrodes need to be placed in the same end.In order to solve this problem, researchers have developed power type energy storage devices with positive and negative electrode terminals in the same end structure, but the existing power type energy storage devices with positive and negative electrode terminals in the same end structure still have some problems, such as the super capacitor with positive and negative electrodes in the same end in the authorized publication No.CN109461589A, the negative electrode post is fixed by extrusion through the sealing ring, and the conductor connecting piece is Z-shaped and can be deformed, so that the stability of the negative electrode post is poor in the later use process, even falls off and causes short circuit. CONTENT OF THE UTILITY MODEL

[0004] The utility model intends to provide a kind of capacitor with positive and negative electrodes in the same end to solve the problem of poor stability of negative electrode post in the use process.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of capacitor with positive and negative electrodes in the same end, including shell, upper cover, positive electrode busbar, negative electrode busbar and roll core;The shell top is open, the roll core is arranged in the shell, the shell is equipped with electrolyte, the roll core and electrolyte form electric core, the roll core is reserved with the aluminum foil connected with the positive electrode busbar and the negative electrode busbar at both ends, to lead out the positive electrode of electric core and the negative electrode of electric core;

[0006] The upper cover is arranged at the top opening of the shell for sealing, and the upper cover comprises an upper cover body, a positive electrode lead-out terminal, a negative electrode lead-out terminal and a negative electrode bus plate connecting plate; the upper cover body is connected with the shell, and the upper cover body is provided with a mounting hole, the negative electrode lead-out terminal passes through the mounting hole, the negative electrode lead-out terminal is riveted with the upper cover body, and a sealing insulating ring is arranged between the negative electrode lead-out terminal and the upper cover body; one end of the negative electrode lead-out terminal is located outside the shell, and the other end is connected with the negative electrode bus plate connecting plate in the shell; the negative electrode bus plate is connected with the negative electrode bus plate connecting plate, and the negative electrode of the battery cell is led out through the negative electrode lead-out terminal.

[0007] The positive electrode lead-out terminal is arranged on the upper cover body and located outside the shell; the positive electrode bus plate is connected with the bottom of the shell, and the positive electrode of the battery cell is led out through the positive electrode lead-out terminal; and the bottom of the shell is provided with a liquid injection hole penetrating through the positive electrode bus plate, and the liquid injection hole is provided with a sealing part for sealing the liquid injection hole.

[0008] The technical effect of the scheme is that: in the scheme, the winding core is arranged in the shell to form a battery cell with the electrolyte in the shell, and aluminum foils are reserved at both ends of the battery cell for welding with the positive electrode bus plate and the negative electrode bus plate to lead out the positive and negative electrodes of the battery cell. Specifically, the negative electrode bus plate is connected with the negative electrode bus plate connecting plate, and the negative electrode of the battery cell is led out through the negative electrode lead-out terminal; the positive electrode bus plate is connected with the bottom of the shell, and the positive electrode of the battery cell is led out through the positive electrode lead-out terminal. The negative electrode lead-out terminal is connected with the negative electrode bus plate connecting plate and the upper cover body at the same time, which is equivalent to fixing the positive cover plate and the negative cover plate together through the negative electrode lead-out terminal at the same end of the capacitor, and the negative electrode lead-out terminal is riveted with the upper cover body, which improves the stability of the negative electrode lead-out terminal; compared with fixing the negative electrode lead-out terminal with the upper cover body by welding, riveting the negative electrode lead-out terminal with the upper cover body reduces the requirement for the operator, so as to improve the product assembly yield.

[0009] Preferably, as an improvement, the upper cover further comprises a fixing part, the fixing part comprising a sealing gasket and a riveting part, the riveting part being a part integrally formed on the negative electrode lead-out terminal, the sealing gasket being sleeved on the negative electrode lead-out terminal and located on the sealing insulating ring, and the riveting part being riveted with the upper cover body through the sealing insulating ring and the sealing gasket.

[0010] Preferably, as an improvement, there is a gap between the negative electrode bus plate and the negative electrode bus plate connecting plate, and a plurality of through holes are arranged on the negative electrode bus plate.

[0011] The technical effect of the scheme is that: the electrolyte can penetrate into the winding core through the gap and the through holes.

[0012] Preferably, as an improvement, a convex ring is formed on the top surface of the negative electrode bus plate, a ring groove is opened on the bottom surface of the negative electrode bus plate connecting plate, the convex ring is in contact with the negative electrode bus plate connecting plate at the ring groove to form a gap, and an insulating tape is arranged on the outer circumferential surface of the negative electrode bus plate and the negative electrode bus plate connecting plate.

[0013] Preferably, as an improvement, the positive busbar is provided with a boss away from the side of the winding core, the boss is assembled with the center of the bottom of the shell to lead the positive electrode of the winding core out of the shell, and the liquid injection hole penetrates the center of the boss.

[0014] The technical effect of the scheme is that, compared with the boss close to the winding core, it is beneficial to reduce the damage of the boss to the winding core in the later use process, and the boss close to the winding core is provided with low mechanical strength, which is easy to be damaged during the pressing of the rubber plug, thereby causing the failure of the rubber plug to cause liquid leakage, if the liquid injection hole leaks, the capacitor will quickly fail, and the liquid leakage will also corrode the circuit board and other devices on the circuit board, which has great safety hazards and high production cost.

[0015] Preferably, as an improvement, a groove is arranged at the bottom of the shell corresponding to the position of the boss, and the diameter of the groove is greater than the diameter of the boss.

[0016] Preferably, as an improvement, the liquid injection hole comprises a circular hole and a conical hole, the sealing part comprises a rubber plug and a sealing nail, the rubber plug is tightly fitted with the conical hole, and the circular hole is tightly fitted with the sealing nail.

[0017] Preferably, as an improvement, the diameter of the rubber plug is 0.4-0.8mm larger than the diameter of the liquid injection hole, and the material of the rubber plug is EPDM.

[0018] Preferably, as an improvement, an insulating sheet or insulating paper is arranged between the upper cover body and the negative busbar connecting disc, the diameter of the insulating sheet or insulating paper is smaller than the diameter of the winding core and greater than the diameter of the negative busbar, and the thickness is 0.1-0.3mm.

[0019] Preferably, as an improvement, the positive lead terminal and the negative lead terminal are both provided with a fixing groove, and the material of the positive lead terminal and the negative lead terminal is tinned metal. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a three-dimensional view of the embodiment of the utility model;

[0021] Figure 2 is a sectional view of the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following will be further described in detail through specific embodiments:

[0023] The reference numerals in the accompanying drawings include: outer casing 1, top cover 2, positive busbar 3, negative busbar 4, core 5; bending part 101, groove 102, rubber plug 103, sealing nail 104, top cover body 201, positive lead-out terminal 202, negative lead-out terminal 203, negative busbar connecting plate 204, sealing insulating ring 205, insulating sheet 206, sealing gasket 207, connecting block 208, fixing groove 209, boss 301.

[0024] The basic implementation examples are as follows: Figure 1 , 2 As shown: Figure 2 The capacitor shown includes a housing 1, a top cover 2, a positive busbar 3, a negative busbar 4, and a core 5. The core 5 is disposed inside the housing 1 and forms a battery cell with the electrolyte inside the housing 1. Aluminum foil is reserved at both ends of the battery cell for connecting to the positive busbar 3 and the negative busbar 4 to lead out the positive and negative terminals of the battery cell. Specifically, the lower end of the battery cell is welded to the positive busbar 3 through the reserved aluminum foil to lead out the positive terminal of the battery cell, and the upper end of the battery cell is welded to the negative busbar 4 through the reserved aluminum foil to lead out the negative terminal of the battery cell.

[0025] The top cover 2 is provided at the top opening of the outer shell 1 for sealing. The top cover 2 includes a top cover body 201, a positive lead terminal 202, a negative lead terminal 203, a negative busbar connection plate 204, a sealing insulating ring 205, and a fixing component. The top cover body 201 is connected to the outer shell 1. Specifically, the top cover body 201 is provided at the top opening of the outer shell 1, and the outer circumferential surface of the top cover body 201 is lower than and abuts the inner circumferential surface of the outer shell 1. Alternatively, an L-shaped groove can be provided around the outer top surface of the top cover body 201, and the opening of the outer shell 1 can be bent inward to form a bent portion 101. The bent portion 101 is provided on the L-shaped groove and welded to the top cover body 201. Thus, during welding, the top cover body 201 supports the bent portion 101 of the main outer shell 1, which facilitates welding and effectively ensures the quality of welding.

[0026] The upper cover body 201 has mounting holes. The negative lead-out terminal 203 passes through the mounting holes, with one end located outside the outer shell 1 and the other end connected to the negative busbar connection plate 204 inside the outer shell 1. The negative lead-out terminal 203 and the negative busbar connection plate 204 can be connected by integral molding, welding, or interference fit. An insulating sheet 206 or insulating paper is provided between the negative lead-out terminal 203 and the negative busbar connection plate 204 and the upper cover body 201. The diameter of the insulating sheet 206 or insulating paper is smaller than the inner diameter of the outer shell 1 and larger than the diameter of the negative busbar 4. The thickness is 0.1-0.3mm. The insulating sheet 206 is bonded to the upper cover body 201. In this embodiment, the insulating sheet 206 is used.

[0027] The sealing insulating ring 205 is a circular sealing insulating ring with an internally hollow I-shaped cross-section in the vertical direction. The sealing insulating ring 205 is disposed in the mounting hole, and its central annular groove engages with the upper cover body 201. Specifically, the upper cover body 201 has a mounting groove on its top surface, and the mounting hole is located on the bottom surface of the mounting groove. The central annular groove of the sealing insulating ring 205 engages with the bottom surface of the mounting groove. The negative terminal lead 203 passes through the sealing insulating ring 205. The fastener is used to fix the sealing insulating ring. 205. In this embodiment, the fastener includes a sealing gasket 207 and a riveting part. The riveting part is a portion integrally formed on the negative lead-out terminal 203. The sealing gasket 207 is sleeved on the negative lead-out terminal 203 and located on the sealing insulating ring 205. The riveting part passes through the sealing insulating ring 205 and the sealing gasket 207 from the inside to the outside and then rivets the sealing gasket 207, the sealing insulating ring 205, and the upper cover body 201 to achieve the riveting of the negative lead-out terminal 203 and the upper cover body 201.

[0028] The positive terminal 202 is disposed on the upper cover body 201, located outside the outer shell 1; in this embodiment, the positive terminal 202 and the negative terminal 203 are made of tin-plated metal, and as shown in the figure... Figure 1 As shown, both the positive terminal 202 and the negative terminal 203 are provided with fixing grooves 209. The fixing grooves 209 are located on the outer circumferential surfaces of the positive terminal 202 and the negative terminal 203. When this energy storage device is installed on the circuit board, the fixing grooves 209 are locked into the mounting holes on the circuit. Then, solder is used to fill the gap between the mounting holes and the fixing grooves. This facilitates the filling of sufficient solder in the mounting holes and fixing grooves 209, which is beneficial for fixing the power type energy storage device to the circuit board.

[0029] This design features a four-claw capacitor with positive and negative terminals on the same side, extending from the center. The negative terminal 203 extends from the center and is connected to a three-claw positive terminal 202 with a disc. This design facilitates stable installation of the capacitor on the circuit board and prevents misalignment during assembly, especially when welding the negative busbar 4 and the negative terminal 203. This solves the problem of uneven sealing in the later sealing process, which can lead to weld perforations and leakage, thus reducing the defect rate.

[0030] An annular groove is formed on the upper cover body 201. The disc part of the positive lead terminal 202 is assembled in the annular groove by limiting and fixed by welding, which helps to stabilize the lead-out of the positive lead terminal 202. The sealing flange of the positive lead terminal 202 is higher than the center negative lead terminal 203, which helps to prevent external impurities such as dust, metal shavings, solder paste, etc. from entering the position of the negative lead terminal 203 of the individual capacitor after the individual capacitor is converted into a module. This avoids the risk of short circuit caused by impurities, improves the yield of the module, and enhances the safety during use.

[0031] The negative busbar 4 is connected with the negative busbar connecting plate 204 by welding, and the negative electrode of the battery cell is led out through the negative lead-out terminal 203; and there is a gap between the negative busbar 4 and the negative busbar connecting plate 204, and a plurality of through holes are arranged on the negative busbar 4; specifically, a convex ring 208 is formed on the top surface of the negative busbar 4, and a ring groove is opened on the bottom surface of the negative busbar connecting plate 204, and the convex ring 208 is in contact with the negative busbar connecting plate 204 at the ring groove to form a gap; the outer circumferential surface of the negative busbar 4 and the negative busbar connecting plate 204 is provided with an insulating tape to prevent the negative electrode of the battery cell from being short-circuited with the shell 1.

[0032] The positive busbar 3 is connected with the inner bottom of the shell 1, and the positive electrode of the battery cell is led out through the positive lead-out terminal 202; specifically, a boss 301 is arranged at the center of the positive busbar 3, which is used for assembly and welding with the center of the inner bottom of the shell 1 to lead the positive electrode of the battery cell out of the shell 1; a recess 102 is arranged on the bottom of the shell 1 corresponding to the position of the boss 301, and the diameter of the slot of the recess 102 is greater than the diameter of the boss 301, so that the boss 301 can be prevented from bulging during welding, and if the boss 301 bulges, the top surface of the bulge can also be parallel to the bottom surface of the shell 1.

[0033] A liquid injection hole is arranged on the bottom of the shell 1, the liquid injection hole penetrates the positive busbar 3, and a sealing component is arranged in the liquid injection hole to seal the liquid injection hole; specifically, the liquid injection hole is arranged at the center of the boss 301, and the liquid injection hole comprises a circular hole and a tapered hole; the sealing component comprises a rubber plug 103 and a sealing nail 104; the tapered hole is used for tight fitting with the rubber plug 103, and the circular hole is used for tight fitting and welding with the sealing nail 104; in the embodiment, the diameter of the rubber plug 103 is 0.4-0.8mm greater than the diameter of the liquid injection hole, and the material of the rubber plug 103 is ethylene-propylene-diene terpolymer; during use, the rubber plug 103 is first installed, and then the sealing nail 104 is installed, and the two are in contact but not connected.

[0034] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A capacitor with the same positive and negative terminals, characterized in that: The device includes a housing, a top cover, a positive electrode busbar, a negative electrode busbar, and a core; the housing has an opening at the top, the core is disposed inside the housing, the housing contains electrolyte, and the core and electrolyte form a battery cell; aluminum foil is pre-installed at both ends of the core for connection to the positive and negative electrode busbars, so as to lead out the positive and negative electrodes of the battery cell; its characteristic is: The top cover is located at the opening at the top of the outer casing for sealing. The top cover includes a top cover body, a positive lead terminal, a negative lead terminal, and a negative busbar connection plate. The top cover body is connected to the outer casing and has mounting holes. The negative lead terminal passes through the mounting holes and is riveted to the top cover body with a sealing insulating ring between them. One end of the negative lead terminal is located outside the outer casing, and the other end is connected to the negative busbar connection plate inside the outer casing. The negative busbar is connected to the negative busbar connection plate to lead out the negative terminal of the battery cell through the negative lead terminal. The positive lead terminal is located on the upper cover body, outside the outer shell; the positive busbar is connected to the bottom of the inner shell, and the positive lead of the battery cell is led out through the positive lead terminal; and a liquid injection hole penetrating the positive busbar is provided on the bottom of the outer shell, and a sealing component for sealing the liquid injection hole is provided inside the liquid injection hole.

2. A capacitor with the same positive and negative terminals as described in claim 1, characterized in that: The top cover also includes a fastener, which includes a sealing gasket and a riveting part. The riveting part is an integrally formed part on the negative lead terminal. The sealing gasket is sleeved on the negative lead terminal and located on the sealing insulating ring. The riveting part is riveted to the top cover body through the sealing insulating ring and the sealing gasket.

3. A capacitor with the same positive and negative terminals as described in any one of claims 1 or 2, characterized in that: There is a gap between the negative electrode busbar and the negative electrode busbar connecting plate, and the negative electrode busbar is provided with several through holes.

4. A capacitor with the same positive and negative terminals as described in claim 3, characterized in that: The top surface of the negative electrode combiner plate has a raised ring, and the bottom surface of the negative electrode combiner plate connection plate has an annular groove. The raised ring contacts the negative electrode combiner plate connection plate at the annular groove to form a gap. Insulating tape is provided on the outer circumference of the negative electrode combiner plate and the negative electrode combiner plate connection plate.

5. A capacitor with the same positive and negative terminals according to any one of claims 1 or 4, characterized in that: A boss is provided on the side of the positive electrode busbar away from the core. The boss is assembled with the center of the bottom of the outer casing to lead the positive electrode of the battery cell to the outer casing. The liquid injection hole passes through the center of the boss.

6. A capacitor with the same positive and negative terminals according to claim 5, characterized in that: The bottom of the outer casing has a groove corresponding to the position of the boss, and the diameter of the groove is larger than the diameter of the boss.

7. A capacitor with the same positive and negative terminals as described in claim 6, characterized in that: The injection port includes a round hole and a tapered hole, and the sealing components include a rubber plug and a sealing pin. The rubber plug is tightly fitted with the tapered hole, and the round hole is tightly fitted with the sealing pin.

8. A capacitor with the same positive and negative terminals according to claim 7, characterized in that: The diameter of the rubber stopper is 0.4-0.8 mm larger than the diameter of the injection hole, and the material of the rubber stopper is EPDM.

9. A capacitor with the same positive and negative terminals according to any one of claims 1 or 8, characterized in that: An insulating sheet or insulating paper is provided between the upper cover body and the negative electrode busbar connection plate. The diameter of the insulating sheet or insulating paper is smaller than the diameter of the core and larger than the diameter of the negative electrode busbar, and the thickness is 0.1-0.3mm.

10. A capacitor with the same positive and negative terminals according to claim 9, characterized in that: Both the positive and negative leads are provided with fixing grooves, and both the positive and negative leads are made of tin-plated metal.

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