End cover assembly, energy storage device and electric equipment

Abstract

According to the end cover assembly, the energy storage device and the electric equipment provided by the invention, whether the air tightness of the end cover assembly is qualified or not can be easily detected during helium detection, and the use reliability of the energy storage device is improved. The end cover assembly comprises an end cover, a pole, a pressing block and a first insulating part. The end cover comprises a first surface and a second surface and is provided with a first through hole, an anti-twisting groove and a first air guide groove, an opening of the anti-twisting groove is located in the first surface and surrounds the first through hole, and an opening of the first air guide groove is located in the first surface and communicates with the anti-twisting groove; the pole penetrates through the first through hole, and the pressing block is located on the side, close to the first surface, of the end cover and sleeves the pole; the first insulating part comprises a first insulating part and a second insulating part, the first insulating part is arranged around the pressing block and exposes part of the opening of the first air guide groove, the second insulating part is connected to the side, facing the end cover, of the first insulating part and is arranged in the anti-twisting groove, the second insulating part and the end cover define an air guide flow channel, and the air guide flow channel is communicated with the first through hole and the first air guide groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an end cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] With the increasingly wide application of energy storage devices, more and more safety problems are highlighted. However, during the assembly process of the energy storage device, many factors such as missing sealing ring will cause the energy storage device to have a poor sealing problem, which is not easy to be detected during helium detection, and the use of the energy storage device with poor sealing will easily cause liquid leakage, thereby reducing the use reliability of the energy storage device. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an end cover assembly, an energy storage device and an electric equipment, which can easily detect whether the air tightness of the end cover assembly is qualified during subsequent helium detection, prevent the end cover assembly with invalid sealing from being put into the production line, avoid the use safety problem caused by the use of the energy storage device with invalid sealing, and improve the use reliability of the energy storage device.

[0004] The present application provides an end cover assembly, which comprises an end cover, a pole, a pressing block and a first insulating piece, the end cover comprises a first surface and a second surface, the first surface and the second surface are oppositely arranged along the thickness direction of the end cover, the end cover is provided with a first through hole, an anti-twist groove and a first gas guide groove, the first through hole penetrates the first surface and the second surface, the opening of the anti-twist groove and the opening of the first gas guide groove are both located on the first surface, the anti-twist groove is arranged around the first through hole and communicates with the first through hole, and the first gas guide groove penetrates the groove side wall surface of the anti-twist groove and communicates with the anti-twist groove.

[0005] The pole is arranged in the first through hole, and the pressing block is located on the side of the end cover close to the first surface and is sleeved on the pole.

[0006] The first insulating piece comprises a first insulating part and a second insulating part, the first insulating part is located on the side of the end cover close to the first surface, is arranged around the pressing block, and exposes at least part of the opening of the first gas guide groove, and the second insulating part is fixedly connected to the side of the first insulating part facing the end cover, is arranged in the anti-twist groove, and forms a gas guide flow channel together with the end cover, and the gas guide flow channel communicates with the first through hole and the first gas guide groove.

[0007] Among them, the second insulating part comprises a first circumferential side surface, and the first circumferential side surface is arranged in a spaced manner with the groove side wall surface of the anti-twist groove.

[0008] The end cover is further provided with a second air guide groove, an opening of the second air guide groove is located on the groove bottom wall surface, the second air guide groove is communicated with the first through hole and the first air guide groove, and the second air guide groove and a surface of the second insulation part, which is away from the first insulation part, enclose the air guide flow channel.

[0009] The second insulation part is provided with a third air guide groove, an opening of the third air guide groove is located on the surface of the second insulation part, which is away from the first insulation part, the third air guide groove is communicated with the first through hole and the first air guide groove, and the third air guide groove and a groove bottom wall surface of the anti-twist groove enclose the air guide flow channel.

[0010] The end cover is further provided with a fourth air guide groove, an opening of the fourth air guide groove is located on a hole wall surface of the first through hole, the fourth air guide groove penetrates through the groove bottom wall surface of the anti-twist groove and the second surface, and the fourth air guide groove is communicated with the air guide flow channel.

[0011] The second insulation part is provided with an insulation ring, the insulation ring is arranged on the surface of the second insulation part, which is away from the first insulation part, and extends into the first through hole and surrounds the pole column, the insulation ring comprises a second circumferential side surface, and the second circumferential side surface is arranged opposite to the hole wall surface of the first through hole;

[0012] The insulation ring is provided with a fifth air guide groove, an opening of the fifth air guide groove is arranged on the second circumferential side surface, and the fifth air guide groove is communicated with the first through hole and the air guide flow channel.

[0013] The first air guide groove and the air guide flow channel are both multiple, the multiple first air guide grooves are arranged at intervals and surround the anti-twist groove, and each air guide flow channel is communicated with the first through hole and one first air guide groove.

[0014] The end cover assembly further comprises a sealing ring, the sealing ring is sleeved on the pole column and clamped between the pole column and the end cover.

[0015] The application further provides a storage device, the storage device comprising a shell, an electric core assembly and the end cover assembly, the shell is provided with a receiving cavity and an opening, the receiving cavity is located on the inner side of the shell and contains electrolyte, the opening is located on the top side of the receiving cavity and is communicated with the receiving cavity, the electric core assembly is contained in the receiving cavity, the electric core assembly can be soaked in the electrolyte, the end cover assembly is installed on the shell and seals the opening and is electrically connected with the electric core assembly.

[0016] The application further provides a power utilization equipment, the storage device is used for supplying power for the power utilization equipment.

[0017] The end cap assembly, energy storage device, and electrical equipment provided in this application, by setting a first gas guide groove on the end cap, and the end cap and the first insulating component enclosing each other to form a gas guide channel, the gas guide channel connects the first gas guide groove and the first through hole. When the energy storage device is not equipped with a sealing ring, the gas inside the energy storage device flows to the outside of the energy storage device through the gas guide channel and the first gas guide groove. During helium testing, the airtightness of the end cap assembly can be easily detected, reducing the use of ineffective end cap assemblies in subsequent production lines, avoiding safety problems such as leakage during the use of the energy storage device, and improving the reliability of the energy storage device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0019] Figure 1 This is a schematic diagram of the energy storage device structure provided in the embodiments of this application;

[0020] Figure 2 yes Figure 1 The diagram shows the structure of the end cap assembly in the energy storage device.

[0021] Figure 3 yes Figure 2 The diagram shows an exploded view of the end cap assembly in the first embodiment.

[0022] Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly cut along point AA in the first embodiment.

[0023] Figure 5 yes Figure 3 A schematic diagram of the end cap structure in the end cap assembly shown;

[0024] Figure 6 yes Figure 5 The diagram shows a cross-sectional view of the end cap cut along point BB.

[0025] Figure 7 yes Figure 3 A schematic diagram of the first insulator in the end cap assembly shown from another angle;

[0026] Figure 8 yes Figure 4 A partial structural schematic diagram of the end cap assembly shown;

[0027] Figure 9 yes Figure 2 The diagram shows the structure of the first insulating element in the second embodiment of the end cap assembly.

[0028] Figure 10 yes Figure 2The diagram shows the structure of the end cap assembly in the second embodiment.

[0029] Figure 11 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly cut along point AA in the second embodiment.

[0030] Figure 12 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application.

[0031] Reference numerals: Energy storage device 1000, housing 2000, opening 2001, end cap assembly 3000, end cap 100, second insulating component 200, collector plate 300, pole post 400, sealing ring 500, pressure block 600, first insulating component 700, explosion-proof valve 800, protective plate 900, first surface 101, second surface 102, third peripheral side 103, first through hole 110, anti-torsion groove 120, groove side wall 121, groove bottom wall 122, first air guide groove 130, second air guide groove 140, fourth air guide groove 150, explosion-proof hole 160, second through hole 210, third through hole 310, pole body 410, limiting member 420, fourth through hole 610, first insulating part 710, second insulating part 720, third surface 721, first peripheral side 722, third air guide groove 723, insulating ring 730, fourth surface 731, second peripheral side 732, fifth air guide groove 733, air guide channel 740, fifth through hole 750, electrical equipment 4000, user load 5000. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the energy storage device 1000 provided in the embodiments of this application.

[0034] This application provides an energy storage device 1000, which may include, but is not limited to, a single battery cell, a battery module, a battery pack, or a battery system. The actual application form of the energy storage device provided in this application embodiment may be, but is not limited to, the listed products, or other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1000. This application embodiment uses a cylindrical battery as an example for illustration.

[0035] The energy storage device 1000 comprises a shell 2000, an electrode assembly (not shown in the figure) and an end cover assembly 3000. The shell 2000 is provided with a receiving cavity (not shown in the figure) and an opening 2001. The receiving cavity is located at the inner side of the shell 2000 and contains electrolyte. The opening 2001 is located at the top side of the receiving cavity and communicates with the receiving cavity. The shell 2000 can be made of aluminum, i.e., the shell 2000 can be an aluminum shell. The electrode assembly is received in the receiving cavity. The electrode assembly can be soaked in the electrolyte. The end cover assembly 3000 is installed on the shell 2000, seals the opening 2001 and is electrically connected with the electrode assembly.

[0036] Please refer to Figures 2 to 4 , Figure 2 is Figure 1 the structural schematic diagram of the end cover assembly 3000 in the energy storage device 1000 shown in Figure 3 is Figure 2 the exploded structural schematic diagram of the end cover assembly 3000 in the first embodiment shown in Figure 4 is Figure 2 the sectional structural schematic diagram of the end cover assembly 3000 in the first embodiment shown in Figure 2 wherein

[0037] The end cover assembly 3000 comprises an end cover 100, a second insulating member 200, a current collector 300, a pole 400, a sealing ring 500, a pressing block 600, a first insulating member 700, an explosion-proof valve 800 and a protective sheet 900. The second insulating member 200 is located at one side of the end cover 100 in the thickness direction of the end cover assembly 3000. The current collector 300 is located at the side of the second insulating member 200 away from the end cover 100. The pole 400 penetrates through the current collector 300, the second insulating member 200 and the end cover 100 in the thickness direction of the end cover assembly 3000. The sealing ring 500 is sleeved on the pole 400 and clamped between the end cover 100 and the pole 400. The pressing block 600 is located at the side of the end cover 100 away from the second insulating member 200, is sleeved on the pole 400 and is fixedly connected with the pole 400. The first insulating member 700 is arranged around the pressing block 600 and is located between the end cover 100 and the pressing block 600. The explosion-proof valve 800 and the protective sheet 900 are both installed on the end cover 100.

[0038] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 3 the structural schematic diagram of the end cover 100 in the end cover assembly 3000 shown in Figure 6 is Figure 5 the sectional structural schematic diagram of the end cover 100 shown in

[0039] The end cover 100 comprises a first surface 101, a second surface 102 and a third peripheral surface 103. The first surface 101 and the second surface 102 are oppositely arranged along the thickness direction of the end cover 100. The first surface 101 is the surface of the end cover 100 away from the accommodating cavity. The second surface 102 is the surface of the end cover 100 close to the accommodating cavity. The third peripheral surface 103 is connected between the first surface 101 and the second surface 102. The end cover 100 can be made of aluminum.

[0040] The end cover 100 is provided with a first through hole 110, an anti-twist groove 120, a first gas guide groove 130, a second gas guide groove 140, a fourth gas guide groove 150 and an explosion-proof hole 160. The first through hole 110 penetrates the end cover 100 along the thickness direction of the end cover 100. The opening of the anti-twist groove 120 is located on the first surface 101. The anti-twist groove 120 is recessed from the first surface 101 to the second surface 102, and is arranged around the first through hole 110 and communicates with the first through hole 110. For example, the anti-twist groove 120 is a cross-shaped groove. The anti-twist groove 120 comprises a groove side wall 121 and a groove bottom wall 122. The groove side wall 121 is arranged around the groove bottom wall 122 and is connected between the groove bottom wall 122 and the first surface 101. The groove bottom wall 122 is located between the first surface 101 and the second surface 102 and is oppositely arranged with the opening of the anti-twist groove 120.

[0041] The opening of the first gas guide groove 130 is located on the first surface 101. The first gas guide groove 130 is recessed from the first surface 101 to the second surface 102 and penetrates the groove side wall 121 of the anti-twist groove 120.

[0042] The opening of the second gas guide groove 140 is located on the groove bottom wall 122. The second gas guide groove 140 is recessed from the groove bottom wall 122 to the second surface 102, penetrates the hole wall of the first through hole 110, and communicates with the first gas guide groove 130 and the first through hole 110. One end of the second gas guide groove 140 communicates with the first gas guide groove 130, and the other end communicates with the first through hole 110.

[0043] The opening of the fourth gas guide groove 150 is located on the hole wall of the first through hole 110. The fourth gas guide groove 150 is recessed from the hole wall of the first through hole 110 to the direction of the third peripheral surface 103, penetrates the second surface 102, and communicates with the second gas guide groove 140.

[0044] The explosion-proof hole 160 penetrates the end cover 100 along the thickness direction of the end cover 100, and is spaced apart from the first through hole 110, the anti-twist groove 120 and the first gas guide groove 130. The explosion-proof valve 800 covers the opening of the explosion-proof hole 160 towards the second surface 102. The protective sheet 900 covers the opening of the explosion-proof hole 160 towards the first surface 101 and protects the explosion-proof valve 800.

[0045] Please continue to readFigure 3 and Figure 4 The second insulating member 200 is located on the side of the end cover 100 close to the second surface 102. The second insulating member 200 is provided with a second through hole 210. The second through hole 210 penetrates the second insulating member 200 in the thickness direction of the second insulating member 200 and is in communication with the first through hole 110 to allow the pole 400 to pass through. The second insulating member 200 can be made of plastic.

[0046] The current collecting plate 300 is located on the side of the second insulating member 200 away from the second surface 102. The current collecting plate 300 is provided with a third through hole 310. The third through hole 310 penetrates the current collecting plate 300 in the thickness direction of the current collecting plate 300 and is in communication with the second through hole 210 to allow the pole 400 to pass through.

[0047] The pole 400 is arranged through the third through hole 310, the second through hole 210 and the first through hole 110 and is fixedly connected with the current collecting plate 300. The pole 400 includes a pole body 410 and a limiting member 420. The pole body 410 is arranged through the third through hole 310, the second through hole 210 and the first through hole 110. The limiting member 420 is located on the side of the current collecting plate 300 away from the second insulating member 200, is arranged around the pole body 410 and is fixedly connected with the pole body 410 and the current collecting plate 300. The pole body 410 is in a cylindrical shape and the limiting member 420 is in a disc shape. The diameter of the limiting member 420 is greater than the diameter of the third through hole 310 to limit the movement of the current collecting plate 300 and the pole 400 in the thickness direction of the end cover assembly 3000 to ensure the assembly stability of the end cover assembly 3000.

[0048] The sealing ring 500 is arranged on the pole body 410 and is clamped between the pole 400 and the hole wall surface of the first through hole 110 and between the limiting member 420 and the second surface 102 of the end cover 100 to seal the gap between the end cover 100 and the pole 400 and ensure the good air tightness of the end cover assembly 3000.

[0049] The pressing block 600 is located on the side of the end cover 100 close to the first surface 101, is arranged on the pole body 410 and is fixedly connected with the pole body 410. The pressing block 600 is provided with a fourth through hole 610. The fourth through hole 610 penetrates the pressing block 600 in the thickness direction of the pressing block 600 to allow the pole body 410 to pass through.

[0050] Please refer to Figure 7 , Figure 7 is Figure 3 the structural schematic view of the first insulating member 700 in the end cover assembly 3000 shown in FIG. 8 from another angle.

[0051] The first insulation member 700 is mounted on the anti-twist groove 120, and is arranged around the pole body 410 and the pressing block 600, and covers part of the opening of the first air guide groove 130. The end of the first air guide groove 130 away from the anti-twist groove 120 is exposed relative to the first insulation member 700. The first insulation member 700 comprises a first insulation part 710 and a second insulation part 720. The first insulation part 710 is arranged on the side of the end cover 100 close to the first surface 101, and is arranged around the pole body 410 and the pressing block 600, and covers part of the opening of the first air guide groove 130. The end of the first air guide groove 130 away from the anti-twist groove 120 is exposed relative to the first insulation part 710.

[0052] The second insulation part 720 is fixedly connected to the side of the first insulation part 710 facing the end cover 100, and is mounted on the anti-twist groove 120. Specifically, the second insulation part 720 and the end cover 100 form an air guide channel 740, and the air guide channel 740 communicates with the first air guide groove 130 and the first through hole 110. The second insulation part 720 comprises a third surface 721 and a first peripheral side 722. The third surface 721 is the surface of the second insulation part 720 away from the first insulation part 710, and covers the opening of the second air guide groove 140. The third surface 721 and the second air guide groove 140 form the air guide channel 740. The air guide channel 740 communicates with the fourth air guide groove 150. The first peripheral side 722 is arranged around the third surface 721, and is connected to the third surface 721 and is arranged spaced apart from the groove side wall surface 121 of the anti-twist groove 120, so that the airflow inside the energy storage device 1000 can pass through.

[0053] In this embodiment, the second insulation part 720 is provided with an insulation ring 730. The insulation ring 730 is arranged on the side of the second insulation part 720 away from the first insulation part 710. The insulation ring 730 extends into the first through hole 110, and is arranged around the pole body 410. The insulation ring 730 comprises a fourth surface 731 and a second peripheral side 732. The fourth surface 731 is the surface of the insulation ring 730 away from the first insulation part 710. The second peripheral side 732 is arranged opposite to the hole wall surface of the first through hole 110. The second peripheral side 732 is arranged around the fourth surface 731, and is connected between the fourth surface 731 and the third surface 721, and covers the end of the second air guide groove 140 away from the groove side wall surface 121.

[0054] In addition, the first insulation member 700 is provided with a fifth through hole 750. The fifth through hole 750 penetrates the first insulation part 710 and the second insulation part 720 along the thickness direction of the first insulation member 700, so that the pole 400 can pass through.

[0055] In this embodiment, the first gas guide groove 130, the gas guide flow channel 740 and the fourth gas guide groove 150 are all two, and each gas guide flow channel 740 is communicated with the first through hole 110 and one first gas guide groove 130, and each fourth gas guide groove 150 is communicated with the first through hole 110 and one gas guide flow channel 740. The number of the first gas guide groove 130, the second gas guide groove 140 and the fourth gas guide groove 150 is not limited in this application.

[0056] Please refer to Figure 8 , Figure 8 is Figure 4 the partial structure schematic diagram of the end cover assembly 3000. Among them, Figure 8 The arrowed line represents the flow path of the gas.

[0057] When the end cover assembly 3000 is not installed with the sealing ring 500, in the process of helium detection, the gas in the energy storage device 1000 can flow to the outside of the energy storage device 1000 through the fourth gas guide groove 150, the gas guide flow channel 740 and the first gas guide groove 130 in turn, so that whether the air tightness of the end cover assembly 3000 is qualified can be detected, the end cover assembly 3000 with invalid sealing is reduced to be put into the subsequent production line, the safety problem of liquid leakage in the use process of the energy storage device 1000 is avoided, and the use reliability of the energy storage device 1000 is improved.

[0058] Please refer to Figures 9 to 11 , Figure 9 is Figure 2 the structure schematic diagram of the first insulating part 700 of the end cover assembly 3000 in the second embodiment, Figure 10 is Figure 2 the structure schematic diagram of the end cover 100 of the end cover assembly 3000 in the second embodiment.

[0059] Figure 11 is Figure 2 the cross-sectional structure schematic diagram of the end cover assembly 3000 in the second embodiment along A-A. Among them, Figure 9 The sealing ring 500 is not shown.

[0060] The second embodiment of the end cover assembly 3000 provided by the embodiment is different from the first embodiment in the design of the first insulating member 700 and the end cover 100. The end cover 100 is provided with only one first air guide groove 130. In the first insulating member 700, the second insulating part 720 is provided with a third air guide groove 723, and the third air guide groove 723 communicates with the first air guide groove 130 of the first through hole 110 of the end cover 100. The opening of the third air guide groove 723 is located on the third surface 721. The third air guide groove 723 is recessed from the third surface 721 to the direction of the first insulating part 710, and one end of the third air guide groove 723 penetrates the first circumferential surface 722. In the embodiment, the third air guide groove 723 and the groove bottom wall surface 122 of the anti-twist groove 120 form an air guide flow channel 740. In addition, the insulating ring 730 of the second insulating part 720 is provided with a fifth air guide groove 733. The opening of the fifth air guide groove 733 is located on the second circumferential surface 732. The fifth air guide groove 733 is recessed from the second circumferential surface 732 to the direction of the hole wall surface of the fifth through hole 750, penetrates the fourth surface 731, and communicates with the first through hole 110 and the air guide flow channel 740.

[0061] When the end cover assembly 3000 is not installed with the sealing ring 500, in the process of helium detection, the gas in the energy storage device 1000 can flow to the outside of the energy storage device 1000 through the fifth air guide groove 733, the air guide flow channel 740 and the first air guide groove 130 in sequence, so that whether the air tightness of the end cover assembly is qualified can be detected, the end cover assembly 3000 with invalid sealing is reduced to be put into the subsequent production line, the safety problem of liquid leakage of the energy storage device 1000 in use is avoided, and the use reliability of the energy storage device 1000 is improved.

[0062] In the embodiment, the number of the third air guide groove 723, the fifth air guide groove 733 and the first air guide groove 130 is two, and each third air guide groove 723 communicates with one fifth air guide groove 733, and each first air guide groove 130 communicates with one third air guide groove 723. The application does not limit this.

[0063] Please refer to Figure 12 , Figure 12 is a structural schematic view of an electric device 4000 provided by the application.

[0064] The embodiment also provides a power utilization device 4000. The power utilization device 4000 can be a new energy automobile, a power storage station, a server, or other device requiring power. In the embodiment, the power utilization device 4000 is a household energy storage device, and is applied to a household energy storage scenario in user-side energy storage. For example, the power utilization device 4000 includes the energy storage device 1000 and a user load 5000 (such as a street lamp, a household appliance, or the like) in the above-described embodiments. The energy storage device 1000 supplies power to the power utilization device 4000, for example, can provide power for the user load 5000 in the power utilization device 4000, to ensure normal operation of the power utilization device 4000. By arranging the energy storage device 1000, the use safety problem caused by using an invalid sealed energy storage device 1000 is avoided, and the use reliability of the power utilization device 4000 is improved.

[0065] The above merely describes optional embodiments of the present application, and the above description is only used to help understand the core idea of the present application, and does not limit the patent scope of the present application; meanwhile, according to the concept of the present application, equivalent structural transformation of the present application specification and drawings, or direct / indirect application in other related technical fields by a person skilled in the art also includes the patent protection scope of the present application.

Claims

1. An end cap assembly, characterized by, The end cover includes a first surface and a second surface, the first surface and the second surface are oppositely arranged along the thickness direction of the end cover, the end cover is provided with a first through hole, an anti-twist groove and a first air guide groove, the first through hole penetrates the first surface and the second surface, the opening of the anti-twist groove and the opening of the first air guide groove are both located on the first surface, the anti-twist groove is arranged around the first through hole and communicates with the first through hole, and the first air guide groove penetrates the groove side wall surface of the anti-twist groove and communicates with the anti-twist groove; The pole is arranged in the first through hole, and the pressing block is arranged on the side of the end cover close to the first surface and surrounds the pole; The first insulation part includes a first insulation part and a second insulation part, the first insulation part is arranged on the side of the end cover close to the first surface and surrounds the pressing block, and at least part of the opening of the first air guide groove is exposed, the second insulation part is fixedly connected to the side of the first insulation part facing the end cover and is arranged in the anti-twist groove, and the end cover and the second insulation part form an air guide flow channel.

2. The end cap assembly of claim 1, wherein, The second insulation part includes a first circumferential surface, and the first circumferential surface is arranged in a spaced manner with the groove side wall surface of the anti-twist groove.

3. An end cap assembly according to claim 1 or 2, wherein, The end cover is further provided with a second air guide groove, the opening of the second air guide groove is located on the groove bottom wall surface of the anti-twist groove, the second air guide groove communicates with the first through hole and the first air guide groove, and the surface of the second insulation part away from the first insulation part forms the air guide flow channel.

4. The end cap assembly of claim 1 or 2, wherein, The second insulation part is provided with a third air guide groove, the opening of the third air guide groove is located on the surface of the second insulation part away from the first insulation part, the third air guide groove communicates with the first through hole and the first air guide groove, and the groove bottom wall surface of the anti-twist groove forms the air guide flow channel.

5. The end cap assembly of claim 1, wherein, The end cover is further provided with a fourth air guide groove, the opening of the fourth air guide groove is located on the hole wall surface of the first through hole, the fourth air guide groove penetrates the groove bottom wall surface of the anti-twist groove and the second surface, and communicates with the air guide flow channel.

6. The end cap assembly of claim 1, wherein, The second insulation part is provided with an insulation ring, the insulation ring is arranged on the surface of the second insulation part away from the first insulation part, extends into the first through hole, and surrounds the pole, the insulation ring includes a second circumferential surface, and the second circumferential surface is arranged in a spaced manner with the hole wall surface of the first through hole; The insulation ring is provided with a fifth air guide groove, the opening of the fifth air guide groove is arranged on the second circumferential surface and communicates with the first through hole and the air guide flow channel.

7. The end cap assembly of claim 1, wherein, The first air guide groove and the air guide flow channel both have a plurality of the first air guide grooves arranged in a spaced manner around the anti-twist groove, and each air guide flow channel communicates with the first through hole and one first air guide groove.

8. The end cap assembly of claim 1, wherein, The end cover assembly further includes a sealing ring, the sealing ring surrounds the pole and is clamped between the pole and the end cover.

9. An energy storage device, characterized by, The energy storage device comprises a shell, an electrode assembly and the end cover assembly as claimed in any one of claims 1-8, the shell is provided with a receiving cavity and an opening, the receiving cavity is located at the inner side of the shell and contains electrolyte, the opening is located at the top side of the receiving cavity and communicates with the receiving cavity, the electrode assembly is received in the receiving cavity, the electrode assembly can be soaked in the electrolyte, the end cover assembly is installed on the shell and seals the opening and electrically connects with the electrode assembly.

10. An electric device, characterized by The energy storage device as claimed in claim 9 is used to supply power to the power consumption device.

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