CN204178932U - Energy storage device - Google Patents

Abstract

The utility model provides an energy storage device, which belongs to the field of energy storage equipment and is composed of a pipe body, a first collector, a first end cover, a second collector, a second end cover and an electric core. The second current collector and the tube body are an integrated structure, and the second current collector and the tube body form a concave structure that is matched with the second end cap. With this structure, it is not necessary to consider the problem of the process used when the second current collector is connected to the pipe body, avoiding resistance instability caused by welding, and also avoiding the connection between the second current collector and the pipe body. The high-precision centering assembly carried out at the time reduces the precision of the tooling and simplifies the process requirements. At the same time, the contact area between the second current collector and the second end cap, and the contact area between the second current collector and the battery core can be maximized, so that the resistance of the energy storage device is correspondingly reduced.

Description

energy storage device

technical field

The utility model relates to the field of energy storage equipment, in particular to an energy storage device.

Background technique

Supercapacitors or lithium batteries are common energy storage devices on the market. At present, traditional energy storage devices include battery cells, first current collectors, second current collectors, first end caps, second end caps, and containers for containing the cells. tube body. The first current collector and the second current collector are respectively welded to the two ends of the battery cell, the first end cover and the second end cover respectively cover the openings at both ends of the tube body, and are respectively connected to the first current collector, The second collector is fluidly connected. The second current collector is directly connected to the pipe body. The connection method is that the second current collector is inserted into the pipe body that has been heated at a high temperature and expanded outward. The second current collector is in interference fit with the pipe body. After the pipe body is cooled, the second Two collectors are tightly connected to the pipe body. The connection method between the second current collector and the tube body will lead to a large internal resistance of the capacitor, which is not conducive to the use under high current conditions, thereby affecting the quality and service life of the supercapacitor.

Utility model content

The purpose of this utility model is to provide an energy storage device, so that the current energy storage device has a relatively high resistance due to the connection method between the second collector and the pipe body.

The utility model is realized in this way. An energy storage device includes a pipe body, a first current collector, a first end cover, a second current collector, a second end cover and an electric core,

The first end cap and the second end cap are respectively arranged at both ends of the tube body, the tube body, the first end cap and the second end cap form a cavity, and the first The current collector, the second current collector and the electric core are placed in the cavity, and the two ends of the electric core are respectively connected with the first current collector and the second current collector, and the first current collector The fluid is connected to the first end cap, the second current collector is connected to the second end cap,

The second current collector and the tube body are an integrated structure, and the second current collector and the tube body form a concave structure that is matched with the second end cap.

Further, the first current collector, the second current collector and the electric core are connected by welding. By welding, the connection between the first current collector and the second current collector and the electric core is more compact and firmer, and the mutual resistance is lower than other connection methods.

Further, the first end cap is provided with a recessed portion, the first current collector is provided with a first protrusion that cooperates with the recessed portion of the first end cap, and the first current collector and the first current collector are The first end cover is interference fit, and the concave part is connected to the first protruding part by welding.

With this connection method, the connection area between the first current collector and the first end cap is greatly increased, and the welding position is changed to the connection between the concave part and the first raised part, the welding trajectory is visible and controllable, and no need to use ultrasonic waves Spot welding or laser blind welding simplifies the product process and improves production efficiency and reliability.

Further, the first end cap is provided with a second protrusion, and the second protrusion is disposed on a side of the first end cap away from the cavity. The arrangement of the second protrusion is to facilitate the connection between the first end cover and other external devices when the energy storage device is in use.

Further, the second end cap is provided with a third protrusion, and the third protrusion is disposed on a side of the second end cap away from the cavity. The provision of the third protrusion is to facilitate the connection of the second end cover with other external devices when the energy storage device is in use.

Further, the second end cap is provided with a through hole for injecting electrolyte, the cavity communicates with the outside through the through hole, and the energy storage device further includes a plug matched with the through hole. The setting of the through hole makes the production and assembly of the energy storage device simpler. After the internal structure connection is completed, it is only necessary to inject electrolyte through the through hole, and then plug the through hole with a plug to seal the cavity. That's it.

Further, the two plugs include an outer plug and an inner plug, the inner plug is arranged in the through hole, the outer plug is arranged at one end of the through hole communicating with the outside, the outer plug and the The second end cap is connected by welding. The inner plug seals the end of the through hole connected to the cavity, the outer plug seals the end of the through hole connected to the outside, and the outer plug is welded on the second end cover, so that the sealing of the cavity is further guaranteed.

Further, the energy storage device further includes an insulating ring disposed between the first end cap and the tube body, and the insulating ring is respectively connected to the first end cap and the tube body. The insulation ring is provided to prevent the first end cap from being in direct contact with the pipe body, causing electric leakage.

Further, the energy storage device further includes a sealing ring for sealing the cavity, the inner wall of the pipe body is provided with a fourth protrusion that cooperates with the sealing ring, and the inner side of the sealing ring is in contact with the sealing ring. The first end cap is connected, and the outer side of the sealing ring is connected with the inner wall of the pipe body. The sealing ring seals the cavity by cooperating with the first end cap and the tube body to prevent electrolyte leakage.

Further, the energy storage device is a supercapacitor or a lithium battery. When the supercapacitor or lithium battery is in working state, compared with the general capacitor or battery, there is a larger current. The structure of the energy storage device provided by the utility model is aimed at the working state of this large current.

The energy storage device provided by the utility model is composed of a pipe body, a first current collector, a first end cover, a second current collector, a second end cover and an electric core. The second current collector and the tube body are an integrated structure, and the second current collector and the tube body form a concave structure that is matched with the second end cap. With this structure, the welding process for connecting the second current collector to the pipe body is reduced, the resistance instability caused by welding is avoided, and the welding process performed when the second current collector is connected to the pipe body is also avoided. High-precision centering assembly reduces tooling accuracy and simplifies process requirements. At the same time, the contact area between the second current collector and the second end cap, and the contact area between the second current collector and the battery cell can be maximized, so that the resistance of the energy storage device is correspondingly reduced. The welding trajectory of the second current collector and the electric core can cover the entire end surface of the electric core, and the welding trajectory is visible and controllable. At the same time, the concave structure makes the connection between the second end cover and the pipe body more stable.

In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a schematic diagram of the external structure of the energy storage device provided by the first embodiment of the utility model;

Fig. 2 is a schematic diagram of the internal structure of the energy storage device provided by the first embodiment of the utility model;

Fig. 3 is a top view of the energy storage device provided by the first embodiment of the utility model;

Fig. 4 is a bottom view of the energy storage device provided by the first embodiment of the utility model;

Fig. 5 is a schematic diagram of the external structure of the energy storage device provided by the second embodiment of the present invention;

Fig. 6 is a schematic diagram of the internal structure of the energy storage device provided by the second embodiment of the present invention;

Fig. 7 is a partial enlarged view of the internal structure schematic diagram of the energy storage device provided by the second embodiment of the utility model;

Fig. 8 is a top view of the energy storage device provided by the second embodiment of the present invention.

Among them, 101-tube body; 102-first current collector; 103-first end cover; 104-second current collector; 105-second end cover; 106-cell; 107-second raised part; 108- 109-through hole; 110-outer plug; 111-inner plug; 112-insulation ring; 113-sealing ring; 114-fourth protrusion; 115-depression; 116-first protrusion department.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

Supercapacitors or lithium batteries are common energy storage devices on the market. At present, traditional energy storage devices include battery cells, first current collectors, second current collectors, first end caps, second end caps, and containers for containing the cells. tube body. The first current collector and the second current collector are respectively welded to the two ends of the battery cell, the first end cover and the second end cover respectively cover the openings at both ends of the tube body, and are respectively connected to the first current collector, The second collector is fluidly connected. The second current collector is directly connected to the pipe body. The connection method is that the second current collector is inserted into the pipe body that has been heated at a high temperature and expanded outward. The second current collector is in interference fit with the pipe body. After the pipe body is cooled, the second Two collectors are tightly connected to the pipe body.

After long-term observation and research, the inventor found that the connection method between the second current collector and the tube body will lead to a large internal resistance of the capacitor, which is not conducive to the use under high current conditions, thereby affecting the quality and service life of the supercapacitor.

The energy storage device provided by the utility model is composed of a pipe body, a first current collector, a first end cover, a second current collector, a second end cover and an electric core. The second current collector and the tube body are an integrated structure, and the second current collector and the tube body form a concave structure that is matched with the second end cap. With this structure, it is not necessary to consider the problem of the process used when the second current collector is connected to the pipe body, avoiding resistance instability caused by welding, and also avoiding the connection between the second current collector and the pipe body. The high-precision centering assembly carried out at the same time reduces the precision of the tooling and simplifies the process requirements. At the same time, the contact area between the second current collector and the second end cap, and the contact area between the second current collector and the battery core can be maximized, so that the resistance of the energy storage device is correspondingly reduced.

Referring to Figures 1-4, the energy storage device provided by the first embodiment of the present invention includes a tube body 101, a first current collector 102, a first end cover 103, a second current collector 104, a second end cover 105 and an electric core 106.

The first end cap 103 and the second end cap 105 are respectively arranged at both ends of the pipe body 101, the pipe body 101, the first end cap 103 and the second end cap 105 form a cavity, the first current collector 102, the second current collector 104 and the electric core 106 are placed in the cavity, and the two ends of the electric core 106 are respectively connected with the first current collector 102 and the second current collector 104, the first current collector 102 is connected with the first end cap 103, and the second current collector 104 is connected with the The second end cap 105 is attached.

The second current collector 104 and the tube body 101 are of an integrated structure, and the second current collector 104 and the tube body 101 form a concave structure matched with the second end cap 105 .

The energy storage device provided by the embodiment of the utility model is composed of a pipe body, a first current collector, a first end cover, a second current collector, a second end cover and an electric core. Adopting the integrated structure of the second current collector 104 and the pipe body 101 reduces the welding process for connecting the second current collector 104 and the pipe body 101, avoids resistance instability caused by welding, and also avoids the first The high-precision centering assembly performed when the two current collectors 104 are connected to the pipe body 101 reduces the precision of the tooling and simplifies the process requirements.

At the same time, the contact area between the second current collector 104 and the second end cap 105 and the contact area between the second current collector 104 and the battery core 106 can be maximized, so that the resistance of the energy storage device also corresponds to reduce. The welding trajectory of the second current collector 104 and the electric core 106 can cover the entire end surface of the electric core, and the welding trajectory is visible and controllable. At the same time, the concave structure makes the connection between the second end cover and the pipe body more stable.

As a preferred mode of the embodiment of the present utility model, the first current collector 102 , the second current collector 104 and the electric core 106 are connected by welding. By welding, the connection between the first current collector 102 , the second current collector 104 and the battery cell 106 is higher and stronger. At the same time, compared with other connection methods, the resistance among the first current collector 102 , the second current collector 104 and the electric core 106 is relatively low.

As a preferred embodiment of the present utility model, the first end cover 103 is provided with a second raised portion 107, and the second raised portion 107 is arranged on a side of the first end cover 103 away from the cavity. The arrangement of the second protrusion 107 facilitates the connection of the first end cover 103 with other external devices more conveniently when the energy storage device is in use.

As a preferred mode of the embodiment of the present invention, the second end cover 105 is provided with a third raised portion 108, and the third raised portion 108 is arranged on a side of the second end cover 105 away from the cavity. The arrangement of the third protrusion 108 facilitates the connection of the second end cover 105 with other external devices more conveniently when the energy storage device is in use.

As a preferred embodiment of the present utility model, the second end cap 105 is provided with a through hole 109 for injecting electrolyte, the cavity communicates with the outside through the through hole 109 , and the energy storage device also includes a plug matched with the through hole 109 . The setting of the through hole 109 makes the production and assembly of the energy storage device simpler. After the internal structure connection is completed, it is only necessary to inject electrolyte through the through hole 109, and then plug the through hole 109 with a plug to complete the cavity. Body is sealed.

As a preferred mode of the embodiment of the present utility model, the two plugs include an outer plug 110 and an inner plug 111, the inner plug 111 is arranged in the through hole 109, the outer plug 110 is arranged at one end of the through hole 109 communicating with the outside, and the outer plug 110 is connected to the outside. The second end cap 105 is connected by welding. The inner plug 111 seals the end of the through hole 109 connected to the cavity, the outer plug 110 seals the end of the through hole 109 connected to the outside, and the outer plug 110 is welded on the second end cover 105, so that the sealing of the cavity is further improved ensure.

As a preferred embodiment of the utility model, the energy storage device further includes an insulating ring 112 disposed between the first end cover 103 and the tube body 101 , and the insulating ring 112 is respectively connected to the first end cover 103 and the tube body 101 . The insulating ring 112 is provided to prevent the first end cap 103 from directly contacting the tube body 101 , causing electric leakage.

As a preferred mode of the embodiment of the present utility model, the energy storage device further includes a sealing ring 113 for sealing the cavity. The inner wall of the pipe body 101 is provided with a fourth protrusion 114 that cooperates with the sealing ring 113. The inner side of the sealing ring 113 It is connected with the first end cap 103 , and the outer side of the sealing ring 113 is connected with the inner wall of the tube body 101 . The sealing ring 113 seals the cavity by cooperating with the first end cap 103 and the tube body 101 to prevent the electrolyte from leaking out.

As a preferred mode of the embodiment of the present utility model, the energy storage device is a supercapacitor or a lithium battery. When the supercapacitor or lithium battery is in working state, compared with the general capacitor or battery, there is a larger current. The structure of the energy storage device provided by the utility model is aimed at the working state of this large current.

Referring to Figures 5-8, the energy storage device provided by the second embodiment of the present invention includes a tube body 101, a first current collector 102, a first end cover 103, a second current collector 104, a second end cover 105 and an electric core 106.

The first end cap 103 and the second end cap 105 are respectively arranged at both ends of the pipe body 101, the pipe body 101, the first end cap 103 and the second end cap 105 form a cavity, the first current collector 102, the second current collector 104 and the electric core 106 are placed in the cavity, and the two ends of the electric core 106 are respectively connected with the first current collector 102 and the second current collector 104, the first current collector 102 is connected with the first end cap 103, and the second current collector 104 is connected with the The second end cap 105 is attached.

The second current collector 104 and the tube body 101 are of an integrated structure, and the second current collector 104 and the tube body 101 form a concave structure matched with the second end cap 105 .

The energy storage device provided by the embodiment of the utility model is composed of a pipe body, a first current collector, a first end cover, a second current collector, a second end cover and an electric core. Adopting the integrated structure of the second current collector 104 and the pipe body 101 reduces the welding process for connecting the second current collector 104 and the pipe body 101, avoids resistance instability caused by welding, and also avoids the first The high-precision centering assembly performed when the two current collectors 104 are connected to the pipe body 101 reduces the precision of the tooling and simplifies the process requirements.

At the same time, the contact area between the second current collector 104 and the second end cap 105 and the contact area between the second current collector 104 and the battery core 106 can be maximized, so that the resistance of the energy storage device also corresponds to reduce. The welding trajectory of the second current collector 104 and the electric core 106 can cover the entire end surface of the electric core, and the welding trajectory is visible and controllable. At the same time, the concave structure makes the connection between the second end cover and the pipe body more stable.

As a preferred mode of the embodiment of the present utility model, the first end cover 103 is provided with a recessed portion 115, the first current collector 102 is provided with a first raised portion 116 matched with the recessed portion 115, the first current collector 102 and the first end The cover 103 has an interference fit, and the concave portion 115 is connected to the first protruding portion 116 by welding.

The recessed depth of the recessed portion 115 matches the raised height of the first raised portion 116 , so that the first current collector 102 and the first end cover 103 can be clamped to each other. The welding spot of the concave part 115 and the first convex part 116 is located at the outer joint of the concave part 115 and the first convex part 116, so that the welding track during welding can be directly seen. When welding, if there is an error, it can be directly observed, which is convenient for timely control and adjustment.

The first current collector 102 and the first end cover 103 are connected in such a way that the space in the pipe body 101 can be fully utilized, and the contact area between the first current collector 102 and the first end cover 103 is increased, and the first current collector 102 The contact area with the battery cell 106 makes the resistance of the energy storage device smaller. Moreover, the welding spot where the concave portion 115 is welded to the first protruding portion 116 is located in the tube body 101 , and has no influence on the airtightness of the cavity of the energy storage device.

In this embodiment, the energy storage device is a supercapacitor or a lithium battery. When the supercapacitor or lithium battery is in working state, compared with the general capacitor or battery, there is a larger current. The structure of the energy storage device provided by the utility model is aimed at the working state of this large current.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. An energy storage device, characterized in that the energy storage device comprises a pipe body, a first current collector, a first end cover, a second current collector, a second end cover and an electric core, The first end cap and the second end cap are respectively arranged at both ends of the tube body, the tube body, the first end cap and the second end cap form a cavity, and the first The current collector, the second current collector and the electric core are placed in the cavity, the first current collector is connected to the first end cap, and the second current collector is connected to the second end cap , the two ends of the cell are respectively connected to the first current collector and the second current collector, The second current collector and the tube body are an integrated structure, and the second current collector and the tube body form a concave structure that is matched with the second end cap. 2 . The energy storage device according to claim 1 , wherein the first current collector, the second current collector and the electric core are connected by welding. 3 . 3. The energy storage device according to claim 1, wherein the first end cap is provided with a recessed portion, and the first current collector is provided with a The first protrusion, the first current collector is in interference fit with the first end cover, and the depression is connected to the first protrusion by welding. 4. The energy storage device according to claim 1, wherein the first end cap is provided with a second protrusion, and the second protrusion is disposed on the first end cap away from the cavity side of the body. 5 . The energy storage device according to claim 1 , wherein the second end cover is provided with a third protrusion, and the third protrusion is disposed on the second end cover away from the cavity. side of the body. 6. The energy storage device according to claim 5, wherein the second end cap is provided with a through hole for injecting electrolyte, the cavity communicates with the outside through the through hole, and the energy storage The device also includes a plug cooperating with the through hole. 7. The energy storage device according to claim 6, wherein the plug includes an outer plug and an inner plug, the inner plug is arranged in the through hole, and the outer plug is arranged between the through hole and the inner plug. At one end communicating with the outside, the outer plug is connected to the second end cap by welding. 8. The energy storage device according to claim 1, characterized in that, the energy storage device further comprises an insulating ring arranged between the first end cover and the tube body, and the insulating ring is respectively connected to the The first end cap and the tube body are connected. 9. The energy storage device according to claim 1, characterized in that, the energy storage device further comprises a sealing ring for sealing the cavity, and the inner wall of the tube body is provided with a For the fourth protrusion, the inner side of the sealing ring is connected to the first end cap, and the outer side of the sealing ring is connected to the inner wall of the pipe body. 10. The energy storage device according to any one of claims 1-9, wherein the energy storage device is a supercapacitor or a lithium battery.