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, the assembly stability between the top patch and the end cover is enhanced, and the product yield of the energy storage device is improved. The end cover assembly comprises an end cover, a sealing cover and a top patch, the end cover comprises a first surface and a second surface which are oppositely arranged, the end cover is provided with a first liquid injection hole, the first liquid injection hole comprises a first sinking groove, a second sinking groove and a first through hole, an opening of the first sinking groove is located in the first surface, and the first sinking groove comprises a first groove bottom wall surface; the first groove bottom wall surface is arranged opposite to an opening of the first sinking groove, the second sinking groove is communicated with the first sinking groove, an opening of the second sinking groove is located in the first groove bottom wall surface, the second sinking groove comprises a second groove bottom wall surface, the second groove bottom wall surface is arranged opposite to an opening of the second sinking groove, and the first through hole penetrates through the second groove bottom wall surface and the second surface; the sealing cover is mounted in the second sinking groove; the top patch is installed on the first surface, is provided with a convex hull extending into the first sinking groove, and covers the sealing cover.

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, the public has higher requirements for the aesthetics and reliability of energy storage devices. In the existing energy storage devices, the top patch is unevenly pasted on the surface of the end cover, which causes the top patch to easily peel off, affecting the product yield 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 enhances the assembly stability between the top patch and the end cover and improves the product yield of the energy storage device.

[0004] The present application provides an end cover assembly, which comprises an end cover, a sealing cover and a top patch, 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 liquid injection hole, the first liquid injection hole penetrates through the first surface and the second surface;

[0005] The first liquid injection hole comprises a first sink, a second sink and a first through hole, the opening of the first sink is located on the first surface, the first sink comprises a first sink bottom wall surface and a first sink side wall surface, the first sink bottom wall surface is oppositely arranged with the opening of the first sink, the first sink side wall surface is arranged around the first sink bottom wall surface and connected between the first sink bottom wall surface and the first surface, the second sink is located on the side of the first sink away from the first surface and communicates with the first sink, the opening of the second sink is located on the first sink bottom wall surface and is spaced apart from the first sink side wall surface, the second sink comprises a second sink bottom wall surface and a second sink side wall surface, the second sink bottom wall surface is oppositely arranged with the opening of the second sink, the second sink side wall surface is arranged around the second sink bottom wall surface and connected between the second sink bottom wall surface and the first sink bottom wall surface, the first through hole is located on the side of the second sink away from the first sink and penetrates through the second sink bottom wall surface and the second surface;

[0006] The sealing cover is mounted on the second sink, the sealing cover comprises a first circumferential surface and a third surface away from the second sink bottom wall surface, the first circumferential surface is welded to the second sink side wall surface, and the third surface is located between the first surface and the second sink bottom wall surface;

[0007] The top patch is mounted on the first surface, the top patch comprises a fourth surface and a fifth surface, the fourth surface is a surface of the top patch away from the end cover, the fifth surface is arranged opposite to the fourth surface along the thickness direction of the top patch, the top patch is provided with a convex bump, the convex bump is arranged on the fifth surface and protrudes away from the fourth surface, and the convex bump extends into the first sink and covers the sealing cover.

[0008] The convex bump comprises a convex bump surface, the convex bump surface is a surface of the convex bump away from the fifth surface, and is arranged opposite and spaced apart from the first groove bottom wall surface, the convex bump is provided with a relief groove, an opening of the relief groove is located on the convex bump surface, the relief groove is recessed from the convex bump surface to the fifth surface, and the relief groove comprises a third groove bottom wall surface, which is arranged opposite to the opening of the relief groove.

[0009] The end cover assembly further comprises a welding portion, which is welded between the first circumferential surface and the second groove side wall surface, extends into the relief groove, and is arranged spaced apart from the third groove bottom wall surface of the relief groove.

[0010] The distance between the convex bump surface and the first groove bottom wall surface is greater than or equal to 0.05 mm and less than or equal to 0.1 mm.

[0011] The relief groove comprises a third groove side wall surface and a fourth groove side wall surface, the third groove side wall surface and the fourth groove side wall surface are arranged spaced apart and opposite along the width direction of the relief groove, a projection of the third groove side wall surface on the first groove bottom wall surface is located on a side of the second groove side wall surface away from the sealing cover, and a projection of the fourth groove side wall surface on the third surface is located on a side of the first circumferential surface away from the second groove side wall surface.

[0012] The distance between the third groove side wall surface and the fourth groove side wall surface is greater than or equal to 2.5 mm and less than or equal to 3.0 mm.

[0013] The depth of the first sink is greater than or equal to 0.3 mm.

[0014] The first through hole comprises a first hole portion, a second hole portion and a chamfered hole portion, the opening of the first hole portion is located on the second groove bottom wall surface, the second hole portion and the chamfered hole portion are both located on a side of the first hole portion away from the second sink, the second hole portion and the first hole portion are arranged spaced apart, the hole diameter of the second hole portion is smaller than the hole diameter of the first hole portion, the chamfered hole portion is located between the first hole portion and the second hole portion and communicates the first hole portion and the second hole portion, and the hole diameter of the chamfered hole portion is greater than or equal to the hole diameter of the second hole portion and smaller than or equal to the hole diameter of the first hole portion.

[0015] The end cover assembly further comprises a sealing pin, the sealing pin comprises a main body part, a first limiting part and a second limiting part, the main body part is arranged in the second hole part, the first limiting part and the second limiting part are located on the same side of the main body part, the first limiting part is arranged in the first hole part, the diameter of the first limiting part is greater than the diameter of the main body part, the second limiting part is connected between the first limiting part and the main body part, and is clamped in the chamfered hole part, the diameter of the second limiting part is greater than or equal to the diameter of the main body part, and less than or equal to the diameter of the second limiting part.

[0016] Wherein, along the direction from the first hole part to the second hole part, the hole diameter of the chamfered hole part gradually decreases.

[0017] Wherein, the hole wall surface of the chamfered hole part is a circular arc surface, the radius of the circular arc surface is greater than or equal to 0.3mm and less than or equal to 0.6mm.

[0018] Wherein, the top patch comprises a patch layer, a first adhesive layer and a second adhesive layer, the patch layer comprises the fourth surface, the first adhesive layer is bonded between the patch layer and the first surface, and comprises the fifth surface, the second adhesive layer is arranged on the fifth surface and forms the convex bump.

[0019] The application also provides an energy storage device, which comprises a shell, an electric core assembly and the end cover assembly described above, 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 communicates with the receiving cavity, the electric core assembly is contained in the receiving cavity, and the end cover assembly is mounted on the shell, seals the opening and is electrically connected with the electric core assembly.

[0020] The application also provides an electric equipment comprising the energy storage device described above, which is used to supply power for the electric equipment.

[0021] In the end cover assembly, the convex bump is arranged on the top patch, which not only enhances the strength of the top patch, but also prevents obvious pressing depression at the position of the first liquid injection hole when the top patch is pressed, is conducive to the uniform adhesion of the top patch on the surface of the end cover, prevents the top patch from being peeled off, enhances the assembly stability between the end cover and the top patch, and improves the product yield of the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings required to be used by the embodiments of the application will be described below.

[0023] Figure 1is a schematic diagram of a structure of an energy storage device provided by an embodiment of the present application;

[0024] Figure 2 is Figure 1 is a schematic diagram of a structure of an end cover assembly in the energy storage device shown in the figure;

[0025] Figure 3 is Figure 2 is a schematic diagram of an exploded structure of the end cover assembly shown in the figure;

[0026] Figure 4 is Figure 2 is a schematic diagram of a structure of the end cover assembly shown in the figure after being cut along A-A;

[0027] Figure 5 is Figure 3 is a schematic diagram of a structure of an end cover in the end cover assembly shown in the figure;

[0028] Figure 6 is Figure 5 is a schematic diagram of a structure of the end cover shown in the figure after being cut along B-B;

[0029] Figure 7 is Figure 6 is a schematic diagram of a structure of a part a in the end cover shown in the figure;

[0030] Figure 8 is a schematic diagram of a cross-sectional structure of a liquid injection nozzle;

[0031] Figure 9 is Figure 3 is a schematic diagram of a structure of a sealing pin in the end cover assembly shown in the figure;

[0032] Figure 10 is Figure 9 is a schematic diagram of a cross-sectional structure of the sealing pin shown in the figure after being cut along C-C;

[0033] Figure 11 is Figure 3 is a schematic diagram of a structure of a top patch in the end cover assembly shown in the figure from another angle;

[0034] Figure 12 is Figure 3 is a schematic diagram of a structure of the top patch in the end cover assembly shown in the figure after being cut along D-D.

[0035] Fig. 1 is a structural schematic diagram of an energy storage device 1000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] Please refer to Figure 1 , Figure 1 Fig. 1 is a structural schematic diagram of an energy storage device 1000 provided in an embodiment of the present application.

[0038] The present application provides an energy storage device 1000, which can include but is not limited to a single battery, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device provided in the embodiments of the present application can be but is not limited to the listed products, and can also be other application forms. The embodiments of the present application do not strictly limit the application form of the energy storage device 1000. The embodiments of the present application take a square battery as an example for description.

[0039] 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.

[0040] Referring to Figures 2 to 4 , Figure 2 is Figure 1 a structural schematic view of the end cover assembly 3000 of the energy storage device 1000 shown in Figure 3 is Figure 2 an exploded structural schematic view of the end cover assembly 3000 shown in Figure 4 is Figure 2 a structural schematic view of the end cover assembly 3000 shown in along the section A-A.

[0041] The end cover assembly 3000 comprises the end cover 100, the explosion-proof valve 200, the protective sheet 300, the lower insulating piece 400, the pole 500, the upper insulating piece 600, the sealing ring 700, the sealing assembly 800 and the top patch 900. The explosion-proof valve 200 and the protective sheet 300 are both mounted on the end cover 100. Along the thickness direction of the end cover assembly 3000, the lower insulating piece 400 is located on one side of the end cover 100. Along the thickness direction of the end cover assembly 3000, the pole 500 penetrates through the end cover 100 and the lower insulating piece 400. Among them, the pole 500 has two, and the two poles 500 are arranged at intervals along the length direction of the end cover assembly 3000. One pole 500 is used as a positive pole, and the other pole 500 is used as a negative pole. The upper insulating piece 600 is mounted between the pole 500 and the end cover 100. Among them, the upper insulating piece 600 has two, and each upper insulating piece 600 is mounted between one pole 500 and the end cover 100. One upper insulating piece 600 is used as a positive insulating piece, and is mounted between the positive pole and the end cover 100. The other upper insulating piece 600 is used as a negative insulating piece, and is mounted between the negative pole and the end cover 100. The sealing ring 700 is sleeved on the upper insulating piece 600, and is clamped between the end cover 100 and the pole 500. Among them, the sealing ring 700 has two, and each sealing ring 700 is sleeved on one upper insulating piece 600, and is clamped between the end cover 100 and one pole 500. One sealing ring 700 is used as a positive sealing ring, and is sleeved on the positive insulating piece, and is clamped between the end cover 100 and the positive pole. The other sealing ring 700 is used as a negative sealing ring, and is sleeved on the negative insulating piece, and is clamped between the end cover 100 and the negative pole. The sealing assembly 800 is mounted between the end cover 100 and the lower insulating piece 400. The top patch 900 is located on the side of the end cover 100 away from the lower insulating piece 400, and is pasted on the end cover 100, and covers the sealing assembly 800.

[0042] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 3 the structural schematic view of the end cover 100 in the end cover assembly 3000 shown in FIG. 1, Figure 6 is Figure 5 the structural schematic view of the end cover 100 along the section B-B shown in FIG. 2.

[0043] In this embodiment, the end cover 100 can be an aluminum sheet made of aluminum. The end cover 100 comprises a first surface 101, a second surface 102 and a second peripheral side 103. Along the thickness direction of the end cover 100, the first surface 101 and the second surface 102 are oppositely arranged. The second peripheral side 103 is connected between the first surface 101 and the second surface 102.

[0044] The end cover 100 is provided with an explosion-proof hole 110, a first electrolyte injection hole 120 and a first pole column hole 130. The explosion-proof hole 110, the first electrolyte injection hole 120 and the first pole column hole 130 all penetrate the first surface 101 and the second surface 102, and are arranged in a spaced manner with the second peripheral side surface 103. In the length direction of the end cover 100, the explosion-proof hole 110 is located in the middle of the end cover 100, and the first electrolyte injection hole 120 is located on one side of the explosion-proof hole 110 and is arranged in a spaced manner with the explosion-proof hole 110.

[0045] In the embodiment, the first electrolyte injection hole 120 includes a first sink groove 10, a second sink groove 20 and a first through hole 30. The opening of the first sink groove 10 is located on the first surface 101. The first sink groove 10 is recessed from the first surface 101 to the second surface 102. The first sink groove 10 includes a first groove bottom wall surface 11 and a first groove side wall surface 12. The first groove bottom wall surface 11 is arranged opposite to the opening of the first sink groove 10. The first groove bottom wall surface 11 is arranged in a spaced manner with the first surface 101. The distance between the first groove bottom wall surface 11 and the first surface 101 is the depth H of the first sink groove 10. For example, the depth H of the first sink groove 10 is greater than 0.3 millimeters. The first groove side wall surface 12 is arranged around the first groove bottom wall surface 11 and is connected between the first surface 101 and the first groove bottom wall surface 11.

[0046] The arrangement of the first sink groove 10 can reserve sufficient welding space for the welded sealing cover 820. At the same time, when the electrolyte injection nozzle 1 is pulled out after the electrolyte injection is completed, the electrolyte brought out during the pulling-out process can be limited in the first sink groove 10, so as to prevent the electrolyte from flowing on the end cover 100 and corroding the incoming material code on the end cover 100.

[0047] The second sink groove 20 is located on the side of the first sink groove 10 away from the first surface 101 and is in communication with the first sink groove 10. The opening of the second sink groove 20 is located on the first groove bottom wall surface 11 and is arranged in a spaced manner with the first groove side wall surface 12. The second sink groove 20 is recessed from the first groove bottom wall surface 11 to the second surface 102. The second sink groove 20 includes a second groove bottom wall surface 21 and a second groove side wall surface 22. The second groove bottom wall surface 21 is arranged opposite to the opening of the second sink groove 20. The second groove side wall surface 22 is arranged around the second groove bottom wall surface and is connected between the second groove bottom wall surface 21 and the first groove bottom wall surface 11.

[0048] Please refer to Figure 7 , Figure 7 is Figure 6 the structural schematic view of the area a in the end cover 100 shown in FIG. 1.

[0049] The first through hole 30 is located on the side of the second groove 20 away from the first groove 10 and communicates with the second groove 20. The first through hole 30 penetrates the second groove bottom wall surface 21 and the second surface 102 and is spaced apart from the second groove side wall surface 22. The first through hole 30 penetrates the second groove bottom wall surface 21 and the second surface 102. The first through hole 30 includes a first hole part 31, a second hole part 32, and a chamfered hole part 33. The opening of the first hole part 31 is located on the second groove bottom wall surface 21. The diameter of the first hole part 31 is D1. The diameter of the first hole part 31 is 3.0 mm. The second hole part 32 and the chamfered hole part 33 are located on the side of the first hole part 31 away from the second groove 20. The second hole part 32 is spaced apart from the first hole part 31. The diameter of the second hole part 32 is D2, and the diameter of the second hole part 32 is less than the diameter D1 of the first hole part 31. The chamfered hole part 33 is located between the first hole part 31 and the second hole part 32 and communicates the first hole part 31 and the second hole part 32. The diameter of the chamfered hole part 33 is D3, and the diameter D3 of the chamfered hole part 33 is greater than the diameter D2 of the second hole part 32 and less than or equal to the diameter D1 of the first hole part 31. In the direction from the first hole part 31 to the second hole part 32, the diameter of the chamfered hole part 33 gradually decreases. In other words, the hole wall surface of the chamfered hole part 33 is a circular arc surface, and the radius range of the circular arc surface is greater than or equal to 0.3 mm and less than or equal to 0.6 mm. The hole wall surface of the chamfered hole part 33 can play a role in guiding the flow direction of the electrolyte. At the same time, the hole wall surface of the chamfered hole part 33 can reduce the risk of scratching plastic filaments when the sealing nail 810 seals the first through hole 30.

[0050] Please refer to Figure 8 , Figure 8 is a schematic diagram of the cross-sectional structure of the liquid injection nozzle 1.

[0051] The liquid injection nozzle 1 includes a first end surface 2, a second end surface 3, and a third peripheral surface 4. In the height direction of the liquid injection nozzle 1, the first end surface 2 and the second end surface 3 are oppositely arranged. The third peripheral surface 4 is connected between the first end surface 2 and the second end surface 3. The liquid injection nozzle 1 is provided with a second through hole 5. The second through hole 5 penetrates the first end surface 2 and the second end surface 3. The second through hole 5 includes a first hole body 6 and a second hole body 7. The opening of the first hole body 6 is located on the first end surface 2. The diameter of the first hole body 6 is D4. The diameter of the first hole body 6 is 7.4 mm. In the height direction of the liquid injection nozzle 1, the second hole body 7 is located on one side of the first hole body 6 and communicates with the first hole body 6 and penetrates the second end surface 3. The diameter of the second hole body 7 is D5, and the diameter D5 of the second hole body 7 is less than the diameter D4 of the first hole body 6 and greater than the diameter D1 of the first hole part 31. The diameter D5 of the second hole body 7 is 3.8 mm, and the height h of the second hole body 7 is 10.5 mm.

[0052] When the energy storage device 1000 is being injected with electrolyte by using the injection nozzle 1, the second end surface 3 of the injection nozzle 1 abuts against the second groove bottom wall surface 21 of the second sink groove 20, and the second through hole 5 of the injection nozzle 1 is aligned with the first through hole 30 to facilitate injection of electrolyte. After the injection nozzle 1 is pulled out after the injection is completed, the electrolyte during the pulling out of the injection nozzle 1 will be limited in the first sink groove 10, and the electrolyte can be prevented from flowing on the end cover 100 to corrode the material code on the end cover 100.

[0053] Please continue to refer to Figure 5 Along the length direction of the end cover 100, the first pole hole 130 is located on one side of the explosion-proof hole 110 and is spaced apart from the explosion-proof hole 110 and the first injection hole 120. Among them, the first pole hole 130 has two. Along the length direction of the end cover 100, the two first pole holes 130 are respectively located at both ends of the end cover 100 and are respectively located on opposite sides of the explosion-proof hole 110. Specifically, one of the first pole holes 130 is located on the side away from the explosion-proof hole 110 of the first injection hole 120 to allow the positive pole to pass through, and the other first pole hole 130 is located on the side away from the first injection hole 120 of the explosion-proof hole 110 to allow the negative pole to pass through.

[0054] Please continue to refer to Figure 3 and Figure 4 The explosion-proof valve 200 covers the opening of the explosion-proof hole 110 on the second surface 102. The protective sheet 300 covers the opening of the explosion-proof hole 110 on the first surface 101 and protects the explosion-proof valve 200.

[0055] The lower insulating piece 400 is located on the side of the second surface 102 away from the first surface 101. The lower insulating piece 400 includes a seventh surface 401, an eighth surface 402, and a fourth peripheral side surface 403. The seventh surface 401 is the surface of the lower insulating piece 400 close to the second surface 102. Along the thickness direction of the lower insulating piece 400, the eighth surface 402 is arranged opposite to the seventh surface 401. The fourth peripheral side surface 403 is connected between the seventh surface 401 and the eighth surface 402.

[0056] The lower insulating piece 400 is also provided with a gas permeable hole 410, a second injection hole 420, and a second pole hole 430. The gas permeable hole 410, the second injection hole 420, and the second pole hole 430 all penetrate the lower insulating piece 400 along the thickness direction of the lower insulating piece and are spaced apart from the fourth peripheral side surface 403. Along the length direction of the lower insulating piece 400, the gas permeable hole 410 is located in the middle of the lower insulating piece 400 and is correspondingly arranged with the explosion-proof hole 110. It should be noted that the gas permeable hole 410 is correspondingly arranged with the explosion-proof hole 110, which means that the orthographic projection of the explosion-proof hole 110 on the lower insulating piece 400 at least partially covers the gas permeable hole 410.

[0057] The second liquid injection hole 420 is located on one side of the air vent hole 410 and is spaced apart from the air vent hole 410 along the length direction of the lower insulation piece 400, and is in communication with the first liquid injection hole 120. The second pole hole 430 is located on one side of the air vent hole 410 and is in communication with the first pole hole 130. The second pole hole 430 has two. The two second pole holes 430 are respectively located at two ends of the lower insulation piece 400 along the length direction of the lower insulation piece 400. Specifically, one second pole hole 430 is in communication with one first pole hole 130 to allow the positive pole to pass through. The other second pole hole 430 is located on the side of the second liquid injection hole 420 away from the air vent hole 410, is spaced apart from the second liquid injection hole 420, and is in communication with the other first pole hole 130 to allow the negative pole to pass through.

[0058] Each pole 500 passes through one first pole hole 130 and one second pole hole 430 along the thickness direction of the end cover assembly 3000. Each upper insulation piece 600 is arranged around one pole 500, passes through one first pole hole 130 and one second pole hole 430, and is located between the end cover 100 and one pole 500. Each sealing ring 700 is sleeved on one upper insulation piece 600, passes through one second pole hole 430, and is clamped between the second surface 102 of the end cover 100 and one pole 500. The sealing ring 700 not only can seal the gap between the end cover 100 and the pole 500 to ensure good air tightness of the end cover assembly 3000, but also can insulate the end cover 100 and the pole 500.

[0059] Please refer to Figure 9 and Figure 10 , Figure 9 is Figure 3 the structure diagram of the sealing nail 810 in the end cover assembly 3000 shown in FIG. 8, Figure 10 is Figure 9 the cross-sectional structure diagram of the sealing nail 810 shown in FIG. 8 along the C-C section;

[0060] The sealing assembly 800 is mounted to the first liquid injection hole 120 and the second liquid injection hole 420 to seal the first liquid injection hole 120 and the second liquid injection hole 420. The sealing assembly 800 includes a sealing spike 810 and a sealing cover 820. The sealing spike 810 is disposed in the first through hole 30 and the second liquid injection hole 420. The sealing spike 810 includes a main body part 811, a first limiting part 812, and a second limiting part 813. The main body part 811 is disposed in the second hole part 32 and the second liquid injection hole 420. The diameter of the main body part 811 is D6. The first limiting part 812 and the second limiting part 813 are located on the side of the main body part 811 away from the lower insulating member 400. The first limiting part 812 is spaced apart from the main body part 811 and is mounted to the first hole part 31 of the first through hole 30. The diameter of the first limiting part 812 is D6, the diameter D7 of the first limiting part 812 is greater than the diameter D6 of the main body part 811 and is less than or equal to the hole diameter D1 of the first hole part 31, so as to be fixed in cooperation with the first hole part 31.

[0061] The second limiting part 813 is located between the first limiting part 812 and the main body part 811 and is connected between the first limiting part 812 and the main body part 811, and is located in the chamfered hole part 33 of the first through hole 30. The diameter of the second limiting part 813 is D8, the diameter D8 of the second limiting part 813 is greater than the diameter D6 of the main body part 811 and is less than or equal to the diameter D7 of the first limiting part 812. In addition, the diameter D8 of the second limiting part 813 is less than or equal to the hole diameter D3 of the chamfered hole part 33 and is greater than the hole diameter D2 of the second hole part 32, so that the second limiting part 813 is clamped in the chamfered hole part 33, thereby limiting the second limiting part 813 in the chamfered hole part 33, reducing the risk of the sealing spike 810 being sucked into the inside of the energy storage device 1000 when the early internal pressure of the energy storage device 1000 decreases.

[0062] The sealing cover 820 is located on the side of the sealing spike 810 away from the lower insulating member 400 and is mounted to the second sink 20. The sealing cover 820 includes a third surface 821, a sixth surface 822, and a first peripheral side surface 823. The third surface 821 is the surface of the sealing cover 820 away from the second groove bottom wall surface 21 and is located between the first surface 101 and the second groove bottom wall surface 21. The sixth surface 822 is disposed opposite to the third surface 821 and abuts against the second groove bottom wall surface 21. The first peripheral side surface 823 is connected between the third surface 821 and the sixth surface 822 and is welded to the second groove side wall surface 22.

[0063] In addition, the end cover assembly 3000 further comprises a welding portion b welded between the first circumferential side surface 823 and the second groove side wall surface 22. It should be noted that in the process of laser welding between the sealing cover 820 and the end cover 100, the portion of the sealing cover 820 close to the first circumferential side surface 823 and the portion of the end cover 100 close to the second groove side wall surface 22 are melted to form the welding portion b. The welding portion b comprises a welding protrusion c protruding relative to the third surface 821 and the first groove bottom wall surface 11 and located between the first surface and the first groove bottom wall surface 11. The height of the welding protrusion c is less than or equal to 0.3 mm, for example, the height of the welding protrusion c is 0.2 mm, or the height of the welding protrusion c is 0.3 mm.

[0064] Since the depth H of the first recess is greater than or equal to 0.3 mm, the depth H of the first recess is greater than the height of the welding protrusion c, which can ensure that the welding protrusion c does not protrude relative to the first surface 101, and is conducive to improving the appearance flatness of the energy storage device 1000 and improving the product yield of the energy storage device 1000.

[0065] Please refer to Figure 11 , Figure 11 is Figure 3 the structural schematic view of the top patch 900 in the end cover assembly 3000 shown in FIG. 9 at another angle.

[0066] The top patch 900 is attached to the first surface 101. The top patch 900 comprises a fourth surface 901 and a fifth surface 902. The fourth surface 901 is the surface of the top patch 900 away from the end cover 100. The fifth surface 902 is disposed opposite to the fourth surface 901 along the thickness direction of the top patch 900.

[0067] The top patch 900 is provided with a third through hole 910 and a third pole post hole 920. The third through hole 910 and the third pole post hole 920 both penetrate the top patch 900 along the thickness direction of the top patch 900. Along the length direction of the top patch 900, the third through hole 910 is located in the middle of the top patch 900 and exposes the protective sheet 300. For example, the third through hole 910 is spoon-shaped to expose the incoming material code on the protective sheet and the end cover 100. The third pole post hole 920 is located on one side of the third through hole 910 and is spaced apart from the third through hole 910. The third pole post hole 920 has two. The two third pole post holes 920 are respectively located on opposite sides of the third through hole 910 and are respectively communicated with one first pole post hole 130. Specifically, one third pole post hole 920 is communicated with one first pole post hole 130 to allow the positive pole post to pass through. The other third pole post hole 920 is communicated with the other first pole post hole 130 to allow the negative pole post to pass through.

[0068] Please refer to Figure 4 and Figure 12 , Figure 12 isFigure 3 Fig. 9 is a schematic view of the structure of the top patch 900 along the line D-D in the end cap assembly 3000 shown in Fig. 8.

[0069] The top patch 900 further comprises a convex bump 930. The convex bump 930 is disposed on the fifth surface 902 and protrudes away from the fourth surface 901 and extends into the first recess 10. The convex bump 930 comprises a convex bump surface 931 and a convex bump side surface 932. The convex bump surface 931 is a surface of the convex bump 930 away from the fifth surface 902 and is disposed opposite and spaced apart from the first recess bottom wall surface 11. In an example, the distance between the convex bump surface 931 and the first recess bottom wall surface 11 is greater than or equal to 0.05 mm and less than or equal to 0.1 mm. The convex bump side surface 932 is disposed around the convex bump surface 931 and is connected between the fifth surface 902 and the convex bump surface 931 and is disposed opposite the first recess side wall surface 12.

[0070] By disposing the convex bump 930 on the top patch 900, the strength of the top patch 900 can be improved, and obvious pressing depressions can be prevented from occurring at the position of the first liquid injection hole 120 when the top patch 900 is pressed, thereby ensuring the appearance consistency of the energy storage device 1000.

[0071] In this embodiment, the top patch 900 comprises a patch layer d, a first adhesive layer e and a second adhesive layer f. The patch layer d comprises the fourth surface 901. The first adhesive layer e is bonded between the patch layer d and the first surface 101 and comprises the fifth surface 902. The second adhesive layer f is disposed on the fifth surface 902 and forms the convex bump 930. In an example, the second adhesive layer f and the first adhesive layer e can be integrally formed. In this case, the second adhesive layer f can be formed in the same process as the first adhesive layer e. The second adhesive layer f can be formed by locally thickening the fifth surface 902 of the first adhesive layer e. Alternatively, the second adhesive layer f and the first adhesive layer e can be formed in different processes. The second adhesive layer f can be formed on the fifth surface 902 of the first adhesive layer e by a secondary gluing process.

[0072] In this embodiment, the convex bump 930 is provided with an avoidance groove 933. The opening of the avoidance groove 933 is located on the convex bump surface 931 and is spaced apart from the convex bump side surface 932. The avoidance groove 933 is recessed from the convex bump surface 931 toward the fifth surface 902 and is disposed around the sealing cover 820. The avoidance groove 933 avoids the welding protrusion c of the welding portion b. The avoidance groove 933 comprises a third groove bottom wall surface 933a, a third groove side wall surface 933b and a fourth groove side wall surface 933c. The third groove bottom wall surface 933a is disposed opposite the opening of the avoidance groove 933 and is spaced apart from the welding portion b to provide sufficient height avoidance space for the welding protrusion c, thereby avoiding the welding protrusion c abutting the top patch 900, ensuring the surface flatness of the fourth surface 901 of the top patch 900 and improving the appearance consistency of the energy storage device 1000.

[0073] The third groove side wall surface 933b and the fourth groove side wall surface 933c are oppositely and spacedly arranged along the width direction of the avoiding groove 933 and are respectively connected to two ends of the third groove bottom wall surface 933a. The projection of the third groove side wall surface 933b on the first groove bottom wall surface 11 is located on the side of the second groove side wall surface 22 away from the sealing cover 820, and the projection of the fourth groove side wall surface 933c on the third surface 821 is located on the side of the first circumferential surface 823 of the sealing cover 820 away from the second groove side wall surface 22. The distance between the third groove side wall surface 933b and the fourth groove side wall surface 933c is greater than the width of the welding protrusion c, so that the welding protrusion c has sufficient width avoiding space. For example, the distance between the third groove side wall surface 933b and the fourth groove side wall surface 933c is greater than or equal to 2.5 mm and less than or equal to 3.0 mm, and the width of the welding protrusion c is 2.1 mm. For example, the avoiding groove 933 is an annular groove.

[0074] The size of the avoiding groove 933 can prevent the welding protrusion c from lifting the top patch 900, avoid the fourth surface 901 of the top patch 900 from being protruded at the position corresponding to the first liquid injection hole 120, improve the flatness of the energy storage device 1000, reduce the misjudgment phenomenon caused by the CCD recognition, and also facilitate the uniform adhesion of the top patch 900 to the first surface 101 of the end cover 100, so that the top patch 900 is not easy to peel off, thereby improving the product yield of the energy storage device 1000.

[0075] The first groove 10 can accommodate the welding protrusion c generated when the first circumferential surface 823 of the sealing cover 820 is welded with the second groove side wall surface 22, so that the welding protrusion c does not protrude relative to the first surface 101, thereby preventing the fourth surface 901 of the top patch 900 from being protruded, reducing the misjudgment phenomenon caused by the CCD recognition, improving the appearance of the energy storage device 1000, and limiting the flow range of the electrolyte when the liquid injection nozzle 1 is pulled out after liquid injection. In addition, the convex bump 930 arranged on the top patch 900 not only enhances the strength of the top patch 900, but also prevents obvious pressing depressions from appearing at the position of the first liquid injection hole 120 when the top patch 900 is pressed, further optimizes the appearance of the energy storage device 1000, facilitates the uniform adhesion of the top patch 900 to the first surface 101 of the end cover 100, enhances the assembly stability between the top patch 900 and the end cover 100, makes the top patch 900 not easy to peel off, and improves the product yield of the energy storage device 1000.

[0076] The embodiment also provides a power utilization device, for example, an energy storage cabinet, a new energy vehicle, etc. The power utilization device comprises the energy storage device 1000 in the above embodiment. Since the specific structure and technical effects of the energy storage device 1000 have been described in detail in the foregoing, the description is not repeated here. The power utilization device provided by the embodiment improves the exhaust performance and use safety and reliability of the power utilization device by arranging the energy storage device 1000.

[0077] The above description is only optional embodiments of the present application, and the above embodiment 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; at the same time, for those skilled in the art, according to the concept of the present application, the equivalent structural transformation made by using the present application specification and drawings, or direct / indirect application in other related technical fields are also included in 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 liquid injection hole, the first liquid injection hole penetrates the first surface and the second surface; The first liquid injection hole includes a first sink, a second sink and a first through hole, the opening of the first sink is located on the first surface, the first sink includes a first sink bottom wall surface and a first sink side wall surface, the first sink bottom wall surface is oppositely arranged with the opening of the first sink, the first sink side wall surface is arranged around the first sink bottom wall surface and is connected between the first sink bottom wall surface and the first surface, the second sink is located on the side of the first sink away from the first surface and communicates with the first sink, the opening of the second sink is located on the first sink bottom wall surface and is spaced apart from the first sink side wall surface, the second sink includes a second sink bottom wall surface and a second sink side wall surface, the second sink bottom wall surface is oppositely arranged with the opening of the second sink, the second sink side wall surface is arranged around the second sink bottom wall surface and is connected between the second sink bottom wall surface and the first sink bottom wall surface, the first through hole is located on the side of the second sink away from the first sink and penetrates the second sink bottom wall surface and the second surface; The sealing cover is mounted on the second sink, the sealing cover includes a first peripheral side and a third surface away from the second sink bottom wall surface, the first peripheral side is welded to the second sink side wall surface, and the third surface is located between the first surface and the second sink bottom wall surface; The top patch is mounted on the first surface, the top patch includes a fourth surface and a fifth surface, the fourth surface is a surface of the top patch away from the end cover, the fifth surface is oppositely arranged with the fourth surface along the thickness direction of the top patch, the top patch is provided with a convex, the convex is provided on the fifth surface and protrudes away from the fourth surface, and the convex extends into the first sink and covers the sealing cover.

2. The end cap assembly of claim 1, wherein, The convex includes a convex surface, the convex surface is a surface of the convex away from the fifth surface and is oppositely and spaced apart from the first sink bottom wall surface, the convex is provided with a relief groove, the opening of the relief groove is located on the convex surface, the relief groove is recessed from the convex surface to the fifth surface, and the relief groove includes a third sink bottom wall surface oppositely arranged with the opening of the relief groove; The end cover assembly further includes a welding portion welded between the first peripheral side and the second sink side wall surface, extends into the relief groove, and is spaced apart from the third sink bottom wall surface of the relief groove.

3. The end cap assembly of claim 2, wherein, The distance between the convex surface and the first sink bottom wall surface is greater than or equal to 0.05mm and less than or equal to 0.1mm.

4. An end cap assembly according to claim 2 or 3, wherein, The avoiding groove comprises a third groove sidewall surface and a fourth groove sidewall surface, the third groove sidewall surface and the fourth groove sidewall surface are spaced and oppositely arranged along the width direction of the avoiding groove, the projection of the third groove sidewall surface on the first groove bottom wall surface is located on the side of the second groove sidewall surface away from the sealing cover, and the projection of the fourth groove sidewall surface on the third surface is located on the side of the first circumferential surface away from the second groove sidewall surface.

5. The end cap assembly of claim 4, wherein, The distance between the third groove sidewall surface and the fourth groove sidewall surface is greater than or equal to 2.5 mm and less than or equal to 3.0 mm.

6. The end cap assembly of any one of claims 1 to 3, wherein, The depth of the first sink groove is greater than or equal to 0.3 mm.

7. The end cap assembly of claim 1, wherein, The first through hole comprises a first hole part, a second hole part and a chamfered hole part, the opening of the first hole part is located on the second groove bottom wall surface, the second hole part and the chamfered hole part are both located on the side of the first hole part away from the second sink groove, the second hole part and the first hole part are spaced, the aperture of the second hole part is smaller than the aperture of the first hole part, the chamfered hole part is located between the first hole part and the second hole part and communicates the first hole part and the second hole part, the aperture of the chamfered hole part is greater than or equal to the aperture of the second hole part and less than or equal to the aperture of the first hole part; The end cover assembly further comprises a sealing spike, the sealing spike comprises a main body part, a first limiting part and a second limiting part, the main body part is arranged through the second hole part, the first limiting part and the second limiting part are both located on the same side of the main body part, the first limiting part is spaced from the main body part and arranged through the first hole part, the diameter of the first limiting part is greater than the diameter of the main body part, the second limiting part is connected between the first limiting part and the main body part and clamped in the chamfered hole part, the diameter of the second limiting part is greater than or equal to the diameter of the main body part and less than or equal to the diameter of the second limiting part.

8. The end cap assembly of claim 7, wherein, The aperture of the chamfered hole part gradually decreases in the direction from the first hole part to the second hole part.

9. The end cap assembly of claim 8, wherein, The hole wall surface of the chamfered hole part is a circular arc surface, the radius of the circular arc surface is greater than or equal to 0.3 mm and less than or equal to 0.6 mm.

10. The end cap assembly of any one of claims 1 to 3, wherein, The top patch comprises a patch layer, a first adhesive layer and a second adhesive layer, the patch layer comprises the fourth surface, the first adhesive layer is bonded between the patch layer and the first surface and comprises the fifth surface, and the second adhesive layer is arranged on the fifth surface and forms the convex bump.

11. An energy storage device, characterized by, The energy storage device comprises a shell, an electric core assembly and an end cover assembly as claimed in any one of claims 1-10, 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 communicates with the receiving cavity, the electric core assembly is received in the receiving cavity, and the end cover assembly is mounted on the shell, seals the opening and is electrically connected with the electric core assembly.

12. An electrical device, characterized by The energy storage device as claimed in claim 11 is used to supply power to the electric equipment.

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