Large cylindrical supercapacitor structure easy to assemble and assembling method thereof

Abstract

The invention discloses an easy-to-assemble large cylindrical supercapacitor structure and an assembly method thereof, and aims to solve the problem that the overall service life of a capacitor is affected due to the fact that the compression amount of a sealing ring in the prior art is difficult to control and the sealing effect is gradually weakened or even failed along with time. According to the technical scheme, the battery comprises a battery cell and a shell arranged on the outer side of the battery cell in a sleeving mode, an opening is formed in one end of the shell, a surface cover assembly is arranged at the opening and comprises a cover plate, a sealing ring and a leading-out terminal arranged at the center of the cover plate, and a terminal circular truncated cone is arranged at the end, close to the battery cell, of the leading-out terminal; a cover plate ring abutting against the terminal circular truncated cone is arranged on the side, close to the leading-out end, of the cover plate, and the sealing ring is arranged between the cover plate and the terminal circular truncated cone. The compression amount of the sealing ring is adjusted by adjusting the height of the cover plate ring.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor structures, and more particularly to a large cylindrical supercapacitor structure that is easy to assemble and an assembling method thereof. Background Art

[0002] In today's high-performance energy storage technology, large cylindrical supercapacitors have become one of the core components supporting the operation of new energy vehicles, smart grids and many high-tech equipment due to their excellent energy density, efficient charging and discharging capabilities and excellent environmental adaptability. However, in the manufacturing and packaging of supercapacitors, the traditional supercapacitor structure still faces severe challenges, especially the method that relies on the combination of the sealing ring and the cover and the sealing through the shell waisting and sealing process, which exposes two core problems.

[0003] The first problem is the uncontrollable compression of the seal ring. In this traditional sealing solution, the compression state of the seal ring directly affects the airtightness and long-term stability of the capacitor. Due to the lack of effective means to accurately quantify the compression of the seal ring, the sealing effect often gradually decays over time, especially in the middle and late stages of the capacitor's life cycle. Seal failure becomes the main factor affecting product reliability, which in turn limits the overall performance and service life of the capacitor.

[0004] The second problem is that the complexity of assembly and the difficulty of automation in the production process constitute another major obstacle. Current technology requires manual installation of the sealing ring to the cover, a process that is not only time-consuming and labor-intensive, but also prone to human error, increasing production costs and not conducive to large-scale industrial production. In addition, since the sealing ring is a rubber product with a soft texture, it is difficult to automate the process of installing the cover to the cover, which seriously hinders the improvement of supercapacitor production efficiency and quality control. Summary of the invention

[0005] The present invention overcomes two deficiencies in the prior art: (1) the compression amount of the sealing ring is difficult to control, resulting in the sealing effect gradually weakening or even failing over time, thereby affecting the overall service life of the capacitor; (2) the sealing ring is soft in texture, and it is time-consuming and labor-intensive to manually install the sealing ring on the cover plate, and it is very easy to introduce errors, thereby reducing the qualified rate of the product; a large cylindrical supercapacitor structure that is easy to assemble is provided, which can utilize the cooperation between the cover plate and the insulating member to control the amount of compression of the sealing ring, so that the sealing ring can effectively maintain the sealing effect for a long time, and at the same time, it can also reduce the errors caused by human factors when the sealing ring is manually installed on the surface cover.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a large cylindrical supercapacitor structure that is easy to assemble, comprising: a battery cell and a shell sleeved on the outside of the battery cell, one end of the shell is provided with an opening, a surface cover assembly is provided at the opening, the surface cover assembly includes a cover plate, a sealing ring and a lead-out terminal arranged at the center of the cover plate, a terminal cone is provided at one end of the lead-out terminal close to the battery cell, a cover plate ring abutting against the terminal cone is provided on one side of the cover plate close to the lead-out end, and the sealing ring is provided between the cover plate and the terminal cone; the compression amount of the sealing ring can be adjusted by adjusting the height of the cover plate ring.

[0007] In the present invention, when the face cover assembly is assembled, the cover plate ring directly abuts against the terminal cone, thereby forming a gap between the cover plate and the terminal cone, and the sealing ring is in the gap, that is, the sealing ring is compressed between the terminal cone and the cover plate; therefore, when the face cover assembly is assembled manually, there is no need to consider the compression of the sealing ring. It is only necessary to abut the cover plate ring against the terminal cone to compress the sealing ring to a specific degree, thereby achieving control of the compression amount of the sealing ring, so that the sealing ring can maintain a good sealing effect for a long time, improve the service life of the capacitor as a whole, and reduce the error of the manual assembly of the face cover assembly. In addition, the setting of the cover plate ring can increase the space between the cover plate and the battery cell, so that it can accommodate more gas, thereby also extending the service life of the capacitor as a whole.

[0008] Preferably, a positive electrode collector and a negative electrode collector are respectively arranged at both ends of the battery cell, and the negative electrode collector is arranged at one end close to the opening; the positive electrode collector is in contact with the shell, and an insulating layer is arranged between the negative electrode collector and the shell.

[0009] The insulating layer insulates the negative electrode current collector from the outer shell, thereby isolating the positive electrode side from the negative electrode side.

[0010] Preferably, a lower insulating ring is arranged between the terminal cone and the cover ring, and a first limiting convex ring matching with the terminal cone is arranged on the end face of the lower insulating ring, and the first limiting convex ring is arranged on the side of the lower insulating ring close to the outer ring.

[0011] The first limiting convex ring can cover the edge of the terminal cone, so that the lower insulating ring can be stably placed on the terminal cone, so that the lower insulating ring can provide stable support for the cover plate, forming an insulating barrier between the cover plate and the terminal cone.

[0012] Preferably, a second limiting convex ring is provided on the end surface of the lower insulating ring on the other side relative to the first limiting convex ring, and the second limiting convex ring is arranged on the side of the lower insulating ring close to the inner ring.

[0013] The second limiting protrusion ring and the sealing ring have the same height, and the second limiting protrusion ring has a limiting effect on the second sealing ring, thereby preventing the second sealing ring from deviating.

[0014] Preferably, a first terminal convex ring is provided on the outer ring surface of the lead-out terminal close to the terminal truncated cone; and a sealing ring is provided outside the first terminal convex ring.

[0015] The first terminal protruding ring cooperates with the lower insulating ring so that the sealing ring is arranged between the first terminal protruding ring and the lower insulating ring.

[0016] Preferably, a second terminal protruding ring is arranged on the outer side wall of the lead-out terminal and on the side close to the opening direction, and the first terminal protruding ring and the second terminal protruding ring cooperate to form a first terminal groove; an upper insulating ring is arranged between the first terminal groove and the cover plate.

[0017] The upper insulating ring can form an insulating structure between the lead-out terminal and the inner side wall of the cover plate hole.

[0018] Preferably, the upper insulating ring comprises a first insulating protruding ring and a first insulating groove, the first insulating protruding ring matches with the first terminal groove, and the first insulating groove matches with the second terminal protruding ring.

[0019] The first terminal protrusion ring and the second terminal protrusion ring form a first terminal groove on the outer side wall of the lead terminal, thereby forming a "wave-shaped" curved structure on the outer side of the lead terminal. When the upper insulating protrusion ring and the wave-shaped curved structure cooperate, the sealing effect can be further improved. And when the upper insulating ring, the sealing ring, the lower insulating ring and the cover plate are assembled, the first terminal protrusion ring and the second terminal protrusion ring limit the upper insulating member, so that after the surface cover assembly is assembled, a stable structure can be formed. This ensures that the surface cover assembly will not be scattered during transportation or transshipment, and the stability of the structure can be ensured.

[0020] Preferably, the outer side wall of the positive electrode current collector is provided with an outer ring groove of the current collector, and the outer shell is provided with a waist ring matched with the outer ring groove of the current collector.

[0021] The setting of the waist ring allows the outer shell to fit tightly with the positive electrode collector, while at the same time allowing the battery cell to be stably fixed in the outer shell.

[0022] Preferably, a liquid injection hole is arranged at one end of the shell away from the opening, a rubber plug is arranged in the liquid injection hole, and an aluminum plug is arranged on the outer side of the rubber plug.

[0023] The electrolyte can be injected into the shell through the injection hole, and then the injection hole is blocked by a rubber plug, and finally the aluminum plug is welded and fixed to the shell.

[0024] The present application also provides a method for assembling a large cylindrical supercapacitor structure that is easy to assemble, comprising the above-mentioned large cylindrical supercapacitor structure that is easy to assemble, and further comprising the following steps: Step 1: Assemble the cover assembly in advance, shape the battery cell, weld the upper end of the battery cell to the negative electrode current collector, and weld the lower end of the battery cell to the negative electrode current collector; Step 2: After assembling the negative electrode current collector and the connecting sheet, they are welded and a circle of KA tape is wrapped around the outside of the welding point to achieve insulation between the positive electrode side and the negative electrode side after assembly; Step 3: Install the battery cell welded with the cover assembly into the housing, perform waist banding on the outer side of the housing to form a waist band ring so that the housing is in close contact with the positive electrode collector, and then perform a circle of penetration welding along the waist band ring to connect the housing to the positive electrode terminal; Step 4: Weld the edges of the shell and the cover; Step 5: Inject the electrolyte into the shell from the injection hole of the aluminum shell, then insert the rubber plug into the lower end of the injection port, place the aluminum plug on the outside of the rubber plug, and then weld the aluminum plug to the shell.

[0025] In the prior art, a separate waist ring structure is usually used. This means that when gas is generated inside the capacitor, the shell is deformed due to the gas pressure, which causes the waist ring to separate from the side wall of the shell, resulting in poor contact and increased internal resistance. Therefore, in this application, the shell and the positive current collector are welded together by penetrating welding and waist ring, so that the shell and the positive current collector are fixed together, and the side wall of the shell is not damaged, thereby ensuring the overall performance of the capacitor.

[0026] Compared with the prior art, the beneficial effect of the present invention is that when the face cover assembly is assembled, the cover ring directly abuts against the terminal cone, thereby forming a gap between the cover and the terminal cone, and the sealing ring is located in the gap, that is, the sealing ring is compressed between the terminal cone and the cover; therefore, when manually assembling the face cover assembly, there is no need to consider the compression of the sealing ring. It is only necessary to abut the cover ring against the terminal cone to compress the sealing ring to a specific degree, thereby achieving control of the compression amount of the sealing ring, so that the sealing ring can maintain a good sealing effect for a long time, thereby improving the overall service life of the capacitor and reducing the error of manual assembly of the face cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the front view of the present invention.

[0028] Figure 2 It is a cross-sectional view of the present invention.

[0029] Figure 3 yes Figure 2 A partial enlarged view of area A.

[0030] Figure 4It is a cross-sectional view in Example 3 or Example 4 of the present application.

[0031] Figure 5 yes Figure 4 A partial enlarged view of area B.

[0032] Figure 6 yes Figure 4 A partial enlarged view of the middle C area.

[0033] In the figure: 1, battery cell, 11, positive electrode current collector, 12, negative electrode current collector, 13, insulating layer; 2. Shell, 21. Opening, 22. Waist ring, 23. Liquid injection hole, 231. Rubber plug, 232. Aluminum plug, 24. Explosion-proof slot 4; 3. cover plate, 31. cover plate hole, 32. cover plate ring, 33. cover plate side groove, 34. pressure relief hole, 35. auxiliary ring groove, 351. auxiliary sealing ring, 352. auxiliary ring cavity, 36. auxiliary channel, 361. expansion channel, 37. sealing plug; 4. Sealing ring; 5. lead terminal, 51. terminal round table, 52. first terminal convex ring, 53. second terminal convex ring, 54. first terminal groove; 6. lower insulating ring, 61. first limiting convex ring, 62. second limiting convex ring; 7. upper insulating ring, 71. first insulating convex ring, 72. first insulating groove; 8. Breaking assembly, 81. Breaking sleeve, 811. Limiting ring, 812. Sealing rubber ring, 82. Breaking column block, 821. Breaking tip, 822. Piston sealing ring, 83. Abutting spring, 84. Insulating pad.

[0034] 9. Connecting piece. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Reference Figures 1 to 3 As shown, a large cylindrical supercapacitor structure that is easy to assemble includes: a battery cell 1 and a shell 2 sleeved on the outside of the battery cell 1, one end of the shell 2 is provided with an opening 21, a surface cover assembly is provided at the opening 21, the surface cover assembly includes a cover plate 3, a sealing ring 4 and a lead-out terminal 5 arranged at the center of the cover plate 3, the lead-out terminal 5 is provided with a terminal cone 51 at one end close to the battery cell 1, a cover plate ring 32 abutting against the terminal cone 51 is provided on one side of the cover plate 3 close to the lead-out end, and the sealing ring 4 is provided between the cover plate 3 and the terminal cone 51; the compression amount of the sealing ring 4 can be adjusted by adjusting the height of the cover plate ring 32.

[0036] In the present invention, when the face cover assembly is assembled, the cover ring 32 directly abuts against the terminal cone 51, thereby forming a gap between the cover plate 3 and the terminal cone 51, and the sealing ring 4 is in the gap, that is, the sealing ring 4 is compressed between the terminal cone 51 and the cover plate 3; therefore, when the face cover assembly is assembled manually, there is no need to consider the compression of the sealing ring 4. It is only necessary to abut the cover ring 32 against the terminal cone 51, so that the sealing ring 4 can be compressed to a certain extent, thereby achieving control of the compression amount of the sealing ring 4, so that the sealing ring 4 can maintain a good sealing effect for a long time, improve the service life of the capacitor as a whole, and reduce the error of the manual assembly of the face cover assembly. In addition, the setting of the cover ring 32 can increase the space between the cover plate 3 and the battery cell 1, so that it can accommodate more gas, thereby also extending the service life of the capacitor as a whole.

[0037] Example 2: Reference Figures 1 to 3 As shown, a large cylindrical supercapacitor structure that is easy to assemble includes: a battery cell 1 and a shell 2 sleeved on the outside of the battery cell 1, an opening 21 is provided at one end of the shell 2, a cover assembly is provided at the opening 21, and the cover assembly includes a cover plate 3, a sealing ring 4, and a lead terminal 5 provided at the center of the cover plate 3, a terminal truncated cone 51 is provided at one end of the lead terminal 5 close to the battery cell 1, a cover plate hole 31 is provided at the center of the cover plate 3, and the lead terminal 5 is provided in the cover plate hole 31. A cover plate ring 32 abutting against the terminal truncated cone 51 is provided on one side of the cover plate 3 close to the lead end, the cover plate ring 32 is provided on the periphery of the cover plate hole 31, and the sealing ring 4 is provided between the cover plate 3 and the terminal truncated cone 51; by adjusting the height of the cover plate ring 32, the compression amount of the sealing ring 4 can be adjusted.

[0038] The positive electrode current collector 11 and the negative electrode current collector 12 are respectively provided at both ends of the battery cell 1. The positive electrode current collector 11 and the negative electrode current collector 12 are fixedly connected to the battery cell 1 by welding. The welding method in this embodiment is laser welding, and the welding methods include but are not limited to laser welding. The negative electrode current collector 12 is provided at one end close to the opening 21; the positive electrode current collector 11 is in contact with the outer shell 2, and an insulating layer 13 is provided between the negative electrode current collector 12 and the outer shell 2. The insulating layer 13 in this embodiment is KA tape.

[0039] A connection piece 9 is provided above the negative electrode current collector 12 , and the bottom of the lead terminal 5 abuts against the connection piece 9 .

[0040] A lower insulating ring 6 is provided between the terminal cone 51 and the cover plate ring 32, and the lower insulating ring 6 insulates the cover plate 3 and the lead terminal 5. A first limiting convex ring 61 matching the terminal cone 51 is provided on the end surface of the lower insulating ring 6, and the first limiting convex ring 61 is provided on the side of the lower insulating ring 6 close to the outer ring. The first limiting convex ring 61 can cover the edge of the terminal cone 51, so that the lower insulating ring 6 can be stably placed on the terminal cone 51, so that the lower insulating ring 6 can play a stable supporting role for the cover plate 3, and form an insulating barrier between the cover plate 3 and the terminal cone 51.

[0041] In addition, the width of the lower insulating ring 6 is smaller than the width of the terminal cone 51, so that a gap is left between the inner wall of the lower insulating ring 6 and the outer wall of the lead terminal 5, so that the sealing ring 4 can be placed in the gap between the outer wall of the lead terminal 5 and the inner wall of the lower circular ring.

[0042] The sealing ring 4 and the lower insulating ring 6 are placed on the terminal truncated cone 51 at the same time, and the thickness of the lower insulating ring 6 is less than that of the sealing ring 4. Therefore, a second limiting convex ring 62 is provided on the end surface of the lower insulating ring 6 on the other side relative to the first limiting convex ring 61, and the second limiting convex ring 62 is provided on the side of the lower insulating ring 6 close to the inner ring. The height of the second limiting convex ring 62 is consistent with that of the sealing ring 4, and the second limiting convex ring 62 limits the second sealing ring 4, thereby preventing the second sealing ring 4 from deflecting.

[0043] When the cover ring 32 abuts against the lower insulating ring 6 , the cover ring 32 is simultaneously located at the periphery of the second limiting protruding ring 62 .

[0044] A first terminal protruding ring 52 is provided on the outer annular surface of the lead-out terminal 5 close to the terminal truncated cone 51 ; the sealing ring 4 is provided outside the first terminal protruding ring 52 .

[0045] On the outer side wall of the lead terminal 5, a second terminal protruding ring 53 is arranged on the side close to the opening 21, and the first terminal protruding ring 52 and the second terminal protruding ring 53 cooperate to form a first terminal groove 54; an upper insulating ring 7 is arranged between the first terminal groove 54 and the cover plate 3. The upper insulating ring 7, the sealing ring 4 and the lower insulating ring 6 cooperate to form an insulating sealing structure between the cover plate 3 and the lead terminal 5, which can isolate the inside of the shell from the outside and have a good insulation effect. The upper insulating ring 7 and the lower insulating ring 6 in this embodiment can be made of rubber material or ceramic material, but include but are not limited to the above two insulating materials.

[0046] The upper insulating ring 7 includes a first insulating protruding ring 71 and a first insulating groove 72. The first insulating protruding ring 71 cooperates with the first terminal groove 54, and the first insulating groove 72 cooperates with the second terminal protruding ring 53. The first terminal protruding ring 52 and the second terminal protruding ring 53 form the first terminal groove 54 on the outer wall of the lead terminal 5, so as to cooperate to form a "wave-shaped" curved structure on the outer side of the lead terminal 5. When the upper insulating protruding ring and the wavy curved structure cooperate, the sealing effect can be further improved. And when the upper insulating ring 7, the sealing ring 4, the lower insulating ring 6 and the cover plate 3 are assembled, the first terminal protruding ring 52 and the second terminal protruding ring 53 play a role in limiting the upper insulating part, so that after the surface cover assembly is assembled, a stable structure can be formed. This ensures that the surface cover assembly will not be scattered during transportation or transshipment, and the stability of the structure can be ensured.

[0047] A cover plate side groove 33 is provided at the edge of the cover plate 3 close to the terminal truncated cone 51 . When the surface cover is mounted on the housing 2 , the cover plate side groove 33 can just match with the edge of the housing 2 .

[0048] The outer wall of the positive current collector 11 is provided with an outer ring groove of the current collector, and the outer shell 2 is provided with a waist ring 22 that matches the outer ring groove of the current collector. The setting of the waist ring 22 enables the outer shell 2 to fit tightly with the positive current collector 11, and at the same time enables the battery cell 1 to be stably fixed in the outer shell 2.

[0049] An injection hole 23 is provided at one end of the housing 2 away from the opening 21, a rubber plug 231 is provided in the injection hole 23, and an aluminum plug 232 is provided outside the rubber plug 231. The electrolyte can be injected into the housing 2 through the injection hole 23, and then the injection hole 23 is blocked by the rubber plug 231, and finally the aluminum plug 232 is fixed to the housing 2 by welding.

[0050] In addition, an explosion-proof groove 24 is provided on the side wall of the housing 2. When the pressure of the gas inside the capacitor reaches a certain level, the explosion-proof groove 24 will be broken, and the gas inside the capacitor will be released to the outside.

[0051] The assembly principle of the present application is as follows: Step 1, the cover assembly is assembled in advance, the battery cell 1 is shaped, the upper end of the battery cell 1 is welded to the negative electrode current collector 12, and the lower end of the battery cell 1 is welded to the negative electrode current collector 12; Step 2: After assembling the negative electrode current collector 12 and the connecting sheet 9, they are welded and a circle of KA tape is wrapped around the outside of the welding point. The KA tape isolates the shell 2 and the negative electrode current collector 12, so that the positive electrode side and the negative electrode side are insulated after assembly; Step 3, install the battery cell 1 welded with the cover assembly into the housing 2, perform waist banding on the outer side of the housing 2 to form a waist band ring 22, so that the housing 2 is in close contact with the positive electrode collector 11, and then perform a circle of penetration welding along the waist band ring 22 to connect the housing 2 to the positive electrode terminal; Step 4: Weld the edges of the housing 2 and the cover plate 3; Step 5: Inject the electrolyte into the outer shell 2 from the injection hole 23 of the aluminum shell, then insert the rubber plug 231 into the lower end of the injection port, place the aluminum plug 232 on the outside of the rubber plug 231, and then weld the aluminum plug 232 to the outer shell 2.

[0052] In the prior art, a separate waist ring 22 is usually used. This means that when gas is generated inside the capacitor, the outer shell 2 is deformed due to the gas pressure, which causes the waist ring 22 to separate from the side wall of the shell, resulting in poor contact and increased internal resistance. Therefore, in this application, the outer shell 2 and the positive current collector 11 are welded together by penetrating welding and the waist ring 22, so that the outer shell 2 and the positive current collector 11 are welded together, so that the outer shell 2 can be fixed to the positive current collector 11, and at the same time, the side wall of the outer shell 2 can be ensured not to be damaged, thereby ensuring the overall performance of the capacitor.

[0053] In the present invention, when the face cover assembly is assembled, the cover ring 32 directly abuts against the terminal cone 51, thereby forming a gap between the cover plate 3 and the terminal cone 51, and the sealing ring 4 is in the gap, that is, the sealing ring 4 is compressed between the terminal cone 51 and the cover plate 3; therefore, when the face cover assembly is assembled manually, there is no need to consider the compression of the sealing ring 4. It is only necessary to abut the cover ring 32 against the terminal cone 51, so that the sealing ring 4 can be compressed to a certain extent, thereby achieving control of the compression amount of the sealing ring 4, so that the sealing ring 4 can maintain a good sealing effect for a long time, improve the service life of the capacitor as a whole, and reduce the error of the manual assembly of the face cover assembly. In addition, the setting of the cover ring 32 can increase the space between the cover plate 3 and the battery cell 1, so that it can accommodate more gas, thereby also extending the service life of the capacitor as a whole.

[0054] Example 3: Reference Figure 4 and Figure 5 As shown, in this embodiment, a pressure relief hole 34 is provided on one side of the cover plate 3 close to the terminal cone 51, and the pressure relief hole 34 does not penetrate, so that the thickness at the position of the pressure relief hole 34 is smaller than the thickness of the cover plate 3, so that when the gas inside the capacitor reaches a certain amount, it can break through the pressure relief hole 34 and release the internal gas.

[0055] In order to ensure that the pressure relief hole 34 can release the pressure in time, a rupture component 8 is provided in the pressure relief hole 34. When the pressure of the gas inside the capacitor reaches a certain intensity, the rupture component 8 can destroy the bottom of the pressure relief hole 34, thereby allowing the gas inside the capacitor to leak out.

[0056] The rupture assembly 8 in the present application includes a rupture sleeve 81 arranged in the inner side wall of the pressure relief hole 34, and a limit collar 811 and a sealing rubber ring 812 are arranged on the inner side wall of the rupture sleeve 81, and the cross section of the sealing rubber ring 812 is triangular. A rupture column block 82 is slidably arranged in the rupture sleeve 81, and the diameter of the rupture column block 82 is smaller than the inner diameter of the sealing rubber ring 812. A rupture tip 821 is arranged at one end of the rupture column block 82 close to the bottom of the pressure relief hole 34, and a piston sealing ring 822 is arranged in the circumferential direction of one end of the rupture column block 82 away from the rupture tip 821. A rupture retaining ring is arranged on the outer side wall of the rupture column block 82. An abutment spring 83 is arranged at the end of the rupture column block 82 away from the rupture tip 821, and the abutment spring 83 pushes the rupture column block 82 to move in the direction close to the inside of the pressure relief hole 34. The lower end of the abutting spring 83 abuts against the connecting piece 9 , and an insulating pad 84 is provided between the connecting piece 9 and the abutting spring 83 to insulate the abutting spring 83 from the connecting piece 9 .

[0057] In this embodiment, when in a normal state, the bursting retaining ring abuts against the sealing rubber ring 812, the piston sealing ring 822 and the inner wall of the bursting sleeve 81 are sealed and matched, and the bursting column block 82 abuts against the sealing rubber ring under the action of the abutting spring 83.

[0058] As the gas pressure inside the capacitor increases, the internal gas pressure can push the rupture column block 82 to move toward the inside of the pressure relief hole 34. However, due to the resistance of the sealing rubber ring 812, the rupture retaining ring and the sealing rubber ring 812 are tightly abutted together.

[0059] When the gas pressure inside the capacitor increases to a certain extent, the sealing rubber ring 812 is compressed, and the breaking retaining ring can break through the limit of the sealing rubber ring 812, so that the breaking retaining ring passes over the sealing rubber ring 812. Since the diameter of the breaking column block 82 is smaller than the inner diameter of the sealing rubber ring 812, the breaking column block 82 is affected by the gas inside the capacitor and moves toward the top of the pressure relief hole 34, so that the breaking tip 821 impacts the top of the pressure relief hole 34. This impact force can penetrate the cover plate 3, so that the gas inside the capacitor leaks out, thereby preventing the capacitor from exploding due to excessive pressure.

[0060] In this embodiment, the maximum value of the internal air pressure of the capacitor is controlled by the cooperation between the sealing rubber ring 812 and the breaking retaining ring. Therefore, by setting a specific diameter of the sealing rubber ring 812, the value of the maximum air pressure in the capacitor when the breaking retaining ring passes over the sealing rubber ring 812 can be controlled, thereby achieving precise control of the internal pressure of the capacitor.

[0061] The limiting ring 811 can prevent the breaking column block 82 from sliding out of the breaking sleeve 81 when the surface cover assembly is installed.

[0062] During installation, it is only necessary to install the burst sleeve 81 in the pressure relief hole 34 . The burst sleeve 81 can be installed in the pressure relief hole 34 in a threaded manner, but the burst sleeve 81 is not limited to being installed in the pressure relief hole 34 in a threaded manner.

[0063] Example 4: Reference Figure 4 and Figure 6 As shown, in this embodiment, an auxiliary ring groove 35 is provided at the position where the cover plate 3 contacts the auxiliary sealing ring 351, the width of the auxiliary ring groove 35 is smaller than the width of the auxiliary sealing ring 351, two auxiliary sealing rings 351 are overlapped and provided in the auxiliary ring groove 35, the two auxiliary sealing rings 351 are both interference fit with the side wall of the auxiliary ring groove 35, a gap is provided between the two auxiliary sealing rings 351 and the bottom of the auxiliary ring groove 35, the gap is the auxiliary ring cavity 352, an auxiliary channel 36 connected to the auxiliary ring cavity 352 is provided on the cover plate 3, an enlarged channel 361 is provided in the auxiliary channel 36, the diameter of the enlarged channel 361 is larger than the diameter of the auxiliary channel 36, a sealing plug 37 is provided at the opening 21 of the auxiliary channel 36, and the sealing plug 37 is sealed with the auxiliary channel 36.

[0064] As the gas pressure inside the capacitor increases, the sealing plug 37 is pushed to move inward. Due to the blocking effect of the sealing plug 37, the gas pressure inside the capacitor will not reach the auxiliary ring cavity 352 through the auxiliary channel 36. When the gas pressure inside the capacitor increases to a certain extent, the sealing plug 37 is pushed into the enlarged channel 361. Since the diameter of the enlarged channel 361 is larger than the diameter of the sealing plug 37, the gas pressure inside the capacitor can act on the auxiliary ring cavity 352 through the auxiliary channel 36, thereby pushing the auxiliary sealing ring 351 to abut against the sealing ring 4. The auxiliary sealing ring 351 is tightly attached to the sealing ring 4, and the sealing ring 4 is also tightly abutted against the terminal truncated cone 51, so that the gas pressure inside the capacitor can be utilized to enable the sealing ring 4 to maintain a better sealing effect.

[0065] Embodiment 5: A method for assembling a large cylindrical supercapacitor structure that is easy to assemble, comprising the large cylindrical supercapacitor structure that is easy to assemble as described in Embodiments 1 to 4, further comprising the following steps: Step 1: Assemble the cover assembly in advance, shape the battery cell 1, weld the upper end of the battery cell 1 to the negative electrode current collector 12, and weld the lower end of the battery cell 1 to the negative electrode current collector 12; Step 2: After assembling the negative electrode current collector 12 and the connecting sheet 9, they are welded and a circle of KA tape is wrapped around the outside of the welding point. The KA tape isolates the shell 2 and the negative electrode current collector 12, so that the positive electrode side and the negative electrode side are insulated after assembly; Step 3, install the battery cell 1 welded with the cover assembly into the housing 2, perform waist banding on the outer side of the housing 2 to form a waist band ring 22, so that the housing 2 is in close contact with the positive electrode collector 11, and then perform a circle of penetration welding along the waist band ring 22 to connect the housing 2 to the positive electrode terminal; Step 4: Weld the edges of the housing 2 and the cover plate 3; Step 5: Inject the electrolyte into the outer shell 2 from the injection hole 23 of the aluminum shell, then insert the rubber plug 231 into the lower end of the injection port, place the aluminum plug 232 on the outside of the rubber plug 231, and then weld the aluminum plug 232 to the outer shell 2.

[0066] In the prior art, a separate waist ring 22 is usually used. This means that when gas is generated inside the capacitor, the outer shell 2 is deformed due to the gas pressure, which causes the waist ring 22 to separate from the side wall of the shell, resulting in poor contact and increased internal resistance. Therefore, in this application, the outer shell 2 and the positive current collector 11 are welded together by penetrating welding and the waist ring 22, so that the outer shell 2 and the positive current collector 11 are welded together, so that the outer shell 2 can be fixed to the positive current collector 11, and at the same time, the side wall of the outer shell 2 can be ensured not to be damaged, thereby ensuring the overall performance of the capacitor.

[0067] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A large cylindrical supercapacitor structure that is easy to assemble, characterized in that: include: A battery cell and a shell sleeved on the outside of the battery cell, an opening is provided at one end of the shell, a surface cover assembly is provided at the opening, the surface cover assembly includes a cover plate, a sealing ring and a lead-out terminal arranged at the center of the cover plate, a terminal cone is provided at one end of the lead-out terminal close to the battery cell, a cover plate ring abutting against the terminal cone is provided on one side of the cover plate close to the lead-out end, and the sealing ring is provided between the cover plate and the terminal cone; the compression amount of the sealing ring can be adjusted by adjusting the height of the cover plate ring.

2. The easy-to-assemble large cylindrical supercapacitor structure according to claim 1, characterized in that: A positive electrode collector and a negative electrode collector are respectively arranged at both ends of the battery cell, and the negative electrode collector is arranged at one end close to the opening; the positive electrode collector is in contact with the shell, and an insulating layer is arranged between the negative electrode collector and the shell.

3. The easy-to-assemble large cylindrical supercapacitor structure according to claim 1, characterized in that: A lower insulating ring is arranged between the terminal cone and the cover ring, and a first limiting convex ring matching with the terminal cone is arranged on the end surface of the lower insulating ring. The first limiting convex ring is arranged on one side of the lower insulating ring close to the outer ring.

4. The easy-to-assemble large cylindrical supercapacitor structure according to claim 3, characterized in that: A second limiting convex ring is arranged on the end surface of the lower insulating ring on the other side relative to the first limiting convex ring, and the second limiting convex ring is arranged on the side of the lower insulating ring close to the inner ring.

5. The easy-to-assemble large cylindrical supercapacitor structure according to claim 1, characterized in that: The outer ring surface of the lead-out terminal close to the terminal truncated cone is provided with a first terminal convex ring; and the sealing ring is arranged outside the first terminal convex ring.

6. The easy-to-assemble large cylindrical supercapacitor structure according to claim 5, characterized in that: The outer wall of the lead-out terminal is provided with a second terminal convex ring on one side close to the opening direction, and the first terminal convex ring and the second terminal convex ring cooperate to form a first terminal groove; an upper insulating ring is provided between the first terminal groove and the cover plate.

7. The easy-to-assemble large cylindrical supercapacitor structure according to claim 6, characterized in that: The upper insulating ring comprises a first insulating protruding ring and a first insulating groove. The first insulating protruding ring matches with the first terminal groove, and the first insulating groove matches with the second terminal protruding ring.

8. The easy-to-assemble large cylindrical supercapacitor structure according to any one of claims 1 to 7, characterized in that: The outer wall of the positive electrode current collector is provided with an outer ring groove of the current collector, and the outer shell is provided with a waist ring matched with the outer ring groove of the current collector.

9. The easy-to-assemble large cylindrical supercapacitor structure according to claim 8, characterized in that: A liquid injection hole is arranged at one end of the shell away from the opening, a rubber plug is arranged in the liquid injection hole, and an aluminum plug is arranged on the outer side of the rubber plug.

10. A method for assembling a large cylindrical supercapacitor structure that is easy to assemble, characterized in that: The large cylindrical supercapacitor structure that is easy to assemble according to any one of claims 1 to 9 further comprises the following steps: Step 1: Assemble the cover assembly in advance, shape the battery cell, weld the upper end of the battery cell to the negative electrode current collector, and weld the lower end of the battery cell to the negative electrode current collector; Step 2: After assembling the negative electrode current collector and the connecting sheet, they are welded and a circle of KA tape is wrapped around the outside of the welding point to achieve insulation between the positive electrode side and the negative electrode side after assembly; Step 3: Install the battery cell welded with the cover assembly into the housing, perform waist banding on the outer side of the housing to form a waist band ring so that the housing is in close contact with the positive electrode current collector, and then perform a circle of penetration welding along the waist band ring to connect the housing to the positive electrode terminal; Step 4: Weld the edges of the shell and the cover; Step 5: Inject the electrolyte into the shell from the injection hole of the aluminum shell, then insert the rubber plug into the lower end of the injection port, place the aluminum plug on the outside of the rubber plug, and then weld the aluminum plug to the shell.

Images