End cap assembly, energy storage device, and electrical device

Abstract

The application provides an end cover assembly, an energy storage device and an electric equipment, which can avoid the movement or displacement of a sealing element during production or transportation, and ensure the good sealing performance of the end cover assembly. The end cover assembly comprises a cover plate, a lower plastic, a pole, a compression ring and a sealing element. The cover plate is provided with an assembly hole. The lower plastic is provided with a mounting hole, and the mounting hole is in communication with the assembly hole. The sealing element is arranged in the mounting hole and abuts against the cover plate and the lower plastic. The sealing element is provided with a first through hole and a first mounting groove. The first through hole is in communication with the assembly hole, and the opening of the first mounting groove is located on the surface of the sealing element away from the cover plate. The first mounting groove is arranged around the first through hole. The compression ring is mounted in the first mounting groove. The circumferential side surface of the compression ring abuts against the groove side wall surface of the first mounting groove. The surface of the compression ring facing the cover plate abuts against the groove bottom wall surface of the first mounting groove. The compression ring is provided with a second through hole, and the second through hole is in communication with the first through hole. The pole is arranged in the assembly hole, the mounting hole, the first through hole and the second through hole, and is fixedly connected with the compression ring.

Description

TECHNICAL FIELD

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

[0002] The secondary battery (Rechargeable battery) is also called as the rechargeable battery or the storage battery, which refers to the battery that can be activated by the active material through the charging mode after the battery is discharged and continues to be used. The recyclable characteristics of the secondary battery make it gradually become the main power source of the electric equipment. With the gradually increasing demand for the secondary battery, the requirements for the performance of the energy density and the use reliability of the secondary battery are also higher and higher. However, in the existing secondary battery, the sealing element of the end cover assembly is prone to shift during the production or transportation process, so that the sealing property of the end cover assembly is poor, which leads to the risk of liquid leakage of the secondary battery and reduces the safety and reliability of the secondary battery. SUMMARY

[0003] The present application provides an end cover assembly, an energy storage device and an electric equipment, which can avoid the shift or displacement of the sealing element during the production or transportation process, ensure the good sealing property of the end cover assembly, reduce the risk of liquid leakage of the energy storage device and improve the safety and reliability of the energy storage device.

[0004] In a first aspect, the application provides an end cover assembly for an energy storage device. The end cover assembly comprises a cover plate, a lower plastic, a pole, a compression ring and a sealing member. The cover plate comprises a first surface and a second surface, which are oppositely arranged along the thickness direction of the cover plate. The cover plate is provided with an assembly hole, which penetrates the first surface and the second surface. The lower plastic is located on the side of the first surface away from the second surface. The lower plastic is provided with a mounting hole, which penetrates the lower plastic along the thickness direction of the lower plastic and communicates with the assembly hole. The sealing member is arranged in the mounting hole and abuts against the cover plate and the lower plastic. The sealing member is provided with a first through hole and a first mounting groove. The first through hole penetrates the sealing member along the thickness direction of the sealing member and communicates with the assembly hole. The opening of the first mounting groove is located on the surface of the sealing member away from the cover plate. The first mounting groove is arranged around the first through hole and communicates with the first through hole. The first mounting groove has a first groove bottom wall surface and a first groove side wall surface. The first groove bottom wall surface is oppositely arranged with the opening of the first mounting groove. The first groove side wall surface is arranged around the first groove bottom wall surface and connected with the first groove bottom wall surface. The compression ring is mounted in the first mounting groove. The compression ring comprises a circumferential side surface and a third surface facing the cover plate. The circumferential side surface abuts against the first groove side wall surface. The third surface abuts against the first groove bottom wall surface. The compression ring is provided with a second through hole, which penetrates the compression ring along the thickness direction of the compression ring and communicates with the first through hole. The pole is arranged in the assembly hole, the mounting hole, the first through hole and the second through hole and fixedly connected with the compression ring.

[0005] The sealing member comprises a first sealing part and a second sealing part. The first sealing part is arranged in the mounting hole and clamped between the cover plate and the compression ring. The first sealing part is provided with the first through hole. The second sealing part is connected to the side of the first sealing part away from the pole, arranged around the first sealing part and clamped between the lower plastic and the compression ring. The second sealing part and the first sealing part form the first mounting groove.

[0006] The lower plastic further has a second mounting groove, an opening of the second mounting groove is located on a surface of the lower plastic away from the cover plate, the second mounting groove is arranged around the mounting hole and is in communication with the mounting hole, a groove wall surface of the second mounting groove comprises a second groove bottom wall surface and a second groove side wall surface, the second groove bottom wall surface is arranged opposite to the opening of the second mounting groove, and the second groove side wall surface is arranged around the second groove bottom wall surface and is connected with the second groove bottom wall surface; the sealing element is mounted in the second mounting groove, the second sealing part comprises a first part and a second part, the first part is connected to one side of the first sealing part away from the pole column, is arranged around the first sealing part, and is clamped between the second groove bottom wall surface and the third surface, and the second part is connected to one side of the first part away from the first sealing part, is arranged around the first part, and is clamped between the second groove side wall surface and the circumferential surface.

[0007] The first part is provided with a ventilation hole, the ventilation hole penetrates the first part in the thickness direction of the first part, is in communication with the first mounting groove, and is arranged in a spaced manner with the first sealing part.

[0008] The lower plastic further has a boss, the boss is arranged on the second groove bottom wall surface, protrudes in a direction of the compression ring along the second groove bottom wall surface, and is arranged in a spaced manner with the mounting hole, the boss is inserted into the ventilation hole and is in interference fit with the ventilation hole.

[0009] The sealing element further comprises a protruding rib, the protruding rib is arranged on a surface of the second part facing the second groove side wall surface, is arranged in a circumferential direction of the second part, and is in abutment with the second groove side wall surface.

[0010] The pole column comprises a fitting part and a fixing part, the fitting part is arranged through the assembly hole, the mounting hole and the first through hole, the fixing part is located on one side of the first surface away from the second surface, is fixedly connected to the fitting part, and is arranged through the second through hole, wherein a circumferential surface of the fitting part is arranged around a circumferential surface of the fixing part, protrudes in a direction of approaching a hole wall surface of the assembly hole relative to the circumferential surface of the fixing part, and a surface of the fitting part facing the fixing part is in abutment with the third surface; the compression ring is provided with a notch, an opening of the notch is located on the third surface, and the notch penetrates a hole wall surface of the second through hole.

[0011] The end cover assembly further comprises an upper plastic, the upper plastic is arranged in the assembly hole and the first through hole, and abuts against the third surface, the upper plastic is provided with a third through hole, a third mounting slot and a first recess, the third through hole penetrates the upper plastic along the thickness direction of the upper plastic and communicates with the second through hole, the opening of the third mounting slot is located on the surface of the upper plastic away from the compression ring, the third mounting slot is arranged around the third through hole and communicates with the third through hole, the slot wall surface of the third mounting slot comprises a third groove bottom wall surface, the third groove bottom wall surface is arranged opposite to the opening of the third mounting slot, the opening of the first recess is located on the third groove bottom wall surface, the first recess penetrates the hole wall surface of the third through hole and communicates with the third through hole; the matching part is further arranged in the third through hole, and the pole column further comprises a flange part, the flange part is connected to one side of the matching part away from the fixed part and is mounted in the third mounting slot.

[0012] The slot wall surface of the third mounting slot further comprises a third groove side wall surface, the third groove side wall surface is arranged around the third groove bottom wall surface and is connected with the third groove bottom wall surface, and the upper plastic is further provided with a second recess, the opening of the second recess is located on the third groove side wall surface, the second recess penetrates the surface of the upper plastic away from the compression ring and communicates with the first recess.

[0013] The upper plastic is further provided with a third recess, the opening of the third recess is located on the surface of the upper plastic facing the cover plate, the third recess penetrates the circumferential surface of the upper plastic and communicates with the assembly hole.

[0014] In a second aspect, the application further provides an energy storage device, comprising a shell and the end cover assembly as any one of the above, the end cover assembly is mounted on the shell and seals the opening of the shell.

[0015] In a third aspect, the application further provides an electric equipment, comprising the energy storage device as above, and the energy storage device supplies power for the electric equipment.

[0016] The end cover assembly provided by the application can position the sealing element through the peripheral side surface of the compression ring, prevent the sealing element from being misassembled, solve the problem of the edge caused by the positioning of the sealing element by the upper plastic, avoid the damage of the sealing element, thereby ensuring the good sealing performance of the end cover assembly, and further reducing the risk of liquid leakage of the energy storage device and improving the safety and reliability of the energy storage device. Meanwhile, when the production personnel observe the end cover assembly from the direction of the cover plate to the compression ring, the production personnel can directly observe the sealing element, the sealing element is visualized, the production personnel can quickly judge whether the sealing element is assembled in the end cover assembly, the outflow rate of unqualified products is reduced, and the production quality of the energy storage device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] 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.

[0018] Figure 1 is a structural schematic diagram of an energy storage device provided by the embodiments of the application;

[0019] Figure 2 is a structural schematic diagram of an end cover assembly in the energy storage device shown in Figure 1

[0020] Figure 3 is an exploded structural schematic diagram of the end cover assembly shown in Figure 2

[0021] Figure 4 is a sectional structural schematic diagram of the end cover assembly shown in along A-A; Figure 2

[0022] Figure 5 is a structural schematic diagram of the lower plastic in the end cover assembly shown in another angle; Figure 3

[0023] Figure 6 is a structural schematic diagram of the lower plastic shown in along B-B; Figure 5

[0024] Figure 7 is a structural schematic diagram of the cover plate in the end cover assembly shown in Figure 3

[0025] Figure 8 is an exploded structural schematic diagram of the pole unit in the end cover assembly shown in Figure 3

[0026] Figure 9 is a structural schematic diagram of the upper plastic in the pole unit shown in Figure 8 ​​​​​​​​

[0027] Figure 10 is Figure 9 is a sectional structure diagram of the upper plastic along C-C in the polar column unit shown in FIG. 4;

[0028] Figure 11 is Figure 8 is a sectional structure diagram of the polar column along D-D in the polar column unit shown in FIG. 5;

[0029] Figure 12 is Figure 8 is a structure diagram of the sealing element in the polar column unit shown in FIG. 6;

[0030] Figure 13 is Figure 12 is a sectional structure diagram of the sealing element along E-E shown in FIG. 7;

[0031] Figure 14 is Figure 8 is a structure diagram of the pressing ring in the polar column unit shown in FIG. 8;

[0032] Figure 15 is Figure 14 is a sectional structure diagram of the pressing ring along F-F shown in FIG. 9.

[0033] The names corresponding to the respective reference signs in the drawings are as follows:

[0034] energy storage device 100, housing 110, end cover assembly 120, lower plastic 10, cover plate 20, explosion-proof valve 30, polar column unit 40, explosion-proof fence 101, liquid inlet hole 102, mounting hole 103, second mounting groove 104, second groove bottom wall surface 104a, second groove side wall surface 104b, boss 11, first surface 21, second surface 22, explosion-proof hole 201, liquid injection hole 202, assembly hole 203, upper plastic 41, polar column 42, sealing element 43, pressing ring 44, third through hole 412, third mounting groove 411, third groove bottom wall surface 411a, third groove side wall surface 411b, first recess 415, second recess 416, third recess 417, main body part 413, extension part 414, fitting part 421, fixing part 422, flange part 423, first through hole 431, first mounting groove 435, first groove bottom wall surface 435a, first groove side wall surface 435b, first sealing part 43a, second sealing part 43b, first part 432, second part 433, air permeation hole 434, first sub-hole 434a, second sub-hole 434b, convex rib 43c, peripheral side surface 442, third surface 443, second through hole 444, notch 441. DETAILED DESCRIPTION

[0035] 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.

[0036] Please refer toFigure 1 , Figure 1 is a structural schematic diagram of an energy storage device 100 provided by an embodiment of the present application. For ease of description, the length direction of the energy storage device 100 is defined as the X-axis direction, the width direction of the energy storage device 100 is defined as the Y-axis direction, and the height direction of the energy storage device 100 is defined as the Z-axis direction, and the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

[0037] The energy storage device 100 comprises a shell 110, an electric core (not shown in the figure) and an end cover assembly 120. The shell 110 has an opening (not shown in the figure) and a receiving cavity (not shown in the figure), and the opening communicates with the receiving cavity. The electric core is received in the receiving cavity. The receiving cavity is also used to receive electrolyte, and the electric core is soaked in the electrolyte. The end cover assembly 120 is installed on the shell 110 and seals the opening of the shell 110. For example, the energy storage device 100 is a square battery. In some other embodiments, the energy storage device 100 can also be a cylindrical battery or other batteries.

[0038] Please refer to Figures 2 to 4 , Figure 2 is a structural schematic diagram of the end cover assembly 120 in the energy storage device 100 shown in Figure 1 , Figure 3 is an exploded structural schematic diagram of the end cover assembly 120 shown in Figure 2 , Figure 4 is a cross-sectional structural schematic diagram of the end cover assembly 120 along A-A after being cut open, as shown in Figure 2 ,

[0039] The end cover assembly 120 comprises a lower plastic 10, a cover plate 20, an explosion-proof valve 30 and two pole column units 40. The lower plastic 10 is installed on one side of the cover plate 20 in the thickness direction. The explosion-proof valve 30 and the two pole column units 40 are both installed on the cover plate 20. Among them, along the length direction of the energy storage device 100, the two pole column units 40 are respectively located on the opposite sides of the explosion-proof valve 30.

[0040] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 5 is a structural schematic diagram of the lower plastic 10 in the end cover assembly 120 from another angle, as shown in Figure 3 , Figure 6 is a structural schematic diagram of the lower plastic 10 after being cut open along B-B, as shown in Figure 5 ,

[0041] The lower plastic 10 comprises an explosion-proof fence 101 which penetrates the lower plastic 10 along the thickness direction of the lower plastic 10. Specifically, the explosion-proof fence 101 is located in the middle of the lower plastic 10. The lower plastic 10 is also provided with a liquid inlet hole 102, two mounting holes 103 and two second mounting grooves 104. Among them, the liquid inlet hole 102 and the two mounting holes 103 all penetrate the lower plastic 10 along the thickness direction of the lower plastic 10, and are spaced apart from each other. Specifically, along the length direction (the X-axis direction shown in the figure) of the energy storage device 100, the liquid inlet hole 102 is located in the middle of the lower plastic 10, and is located on one side of the explosion-proof fence 101 and is spaced apart from the explosion-proof fence 101.

[0042] Along the length direction (the X-axis direction shown in the figure) of the energy storage device 100, the two mounting holes 103 are both located at the edge of the lower plastic 10, and are both spaced apart from the liquid inlet hole 102 and the explosion-proof fence 101. Specifically, one mounting hole 103 is located on the side of the liquid inlet hole 102 away from the explosion-proof fence 101, and the other mounting hole 103 is located on the side of the explosion-proof fence 101 away from the liquid inlet hole 102.

[0043] The openings of the two second mounting grooves 104 are both located on the surface of the lower plastic 10 away from the cover plate 20. The two second mounting grooves 104 are both recessed from the surface of the lower plastic 10 away from the cover plate 20 to the direction of the cover plate 20. Along the length direction (the X-axis direction shown in the figure) of the lower plastic 10, the two second mounting grooves 104 are spaced apart. Each second mounting groove 104 is arranged around the circumferential side of one mounting hole 103 and communicates with one mounting hole 103. Specifically, the groove wall surface of each second mounting groove 104 comprises a second groove bottom wall surface 104a and a second groove side wall surface 104b. The second groove bottom wall surface 104a is arranged opposite to the opening of the second mounting groove 104. The second groove side wall surface 104b is arranged around the second groove bottom wall surface 104a and is connected with the second groove bottom wall surface 104a.

[0044] In this embodiment, the lower plastic 10 is also provided with a boss 11. The boss 11 is arranged on the second groove bottom wall surface 104a and protrudes away from the second groove bottom wall surface 104a, and is spaced apart from the mounting hole 103. In this embodiment, a plurality of bosses 11 are arranged on the second groove bottom wall surface 104a of each second mounting groove 104. The plurality of bosses 11 are spaced apart around the mounting hole 103.

[0045] Please refer to Figure 3 and Figure 7 , Figure 7 is Figure 3 the structure diagram of the cover plate 20 in the end cover assembly 120 shown in the figure.

[0046] In this embodiment, the cover plate 20 comprises a first surface 21 and a second surface 22, which are oppositely arranged along the thickness direction (the Z-axis direction shown in the figure) of the cover plate 20. The first surface 21 is the surface of the cover plate 20 facing the lower plastic 10, and the second surface 22 is the surface of the cover plate 20 away from the lower plastic 10.

[0047] The cover plate 20 is also provided with an explosion-proof hole 201, a liquid injection hole 202, and two assembly holes 203. The explosion-proof hole 201, the liquid injection hole 202, and the two assembly holes 203 all penetrate the first surface 21 and the second surface 22 of the cover plate 20 and are spaced apart from each other. Specifically, the explosion-proof hole 201 and the liquid injection hole 202 are both located in the middle of the cover plate 20. The explosion-proof hole 201 can be connected to the inside of the energy storage device 100 through the explosion-proof fence 101. Along the length direction (the X-axis direction shown in the figure) of the cover plate 20, the liquid injection hole 202 is located on one side of the explosion-proof hole 201. The liquid injection hole 202 is in communication with the liquid inlet hole 102 of the lower plastic 10. The electrolyte can be injected into the accommodation cavity of the shell 110 (as shown in Figure 1

[0048] Along the length direction (the X-axis direction shown in the figure) of the energy storage device 100, the two assembly holes 203 are both located at the edge of the cover plate 20 and are respectively located on the opposite sides of the explosion-proof hole 201 and the liquid injection hole 202. Specifically, one assembly hole 203 is located on the side of the liquid injection hole 202 away from the explosion-proof hole 201, and the other assembly hole 203 is located on the side of the explosion-proof hole 201 away from the liquid injection hole 202. Each assembly hole 203 is in communication with one mounting hole 103 of the lower plastic 10 to facilitate the installation of one pole unit 40.

[0049] Please continue to refer to Figure 4 and Figure 7 . The explosion-proof valve 30 is installed in the explosion-proof hole 201 and is fixedly connected to the hole wall of the explosion-proof hole 201. For example, the explosion-proof valve 30 can be fixedly connected to the hole wall of the explosion-proof hole 201 by welding to be installed in the explosion-proof hole 201. It can be understood that since the explosion-proof hole 201 is in communication with the inside and outside of the energy storage device 100, when the air pressure inside the energy storage device 100 is too large, the explosion-proof valve 30 will be broken under the action of the air pressure, and the gas inside the energy storage device 100 can be sequentially discharged to the outside of the energy storage device 100 through the explosion-proof fence 101 of the lower plastic 10 and the explosion-proof hole 201 in time, thereby avoiding the explosion of the energy storage device 100 and improving the use reliability of the energy storage device 100.

[0050] ​In this embodiment, the two pole post units 40 can be the same or similar structure. One of the pole post units is a positive pole post unit and is electrically connected to the positive tab of the battery cell. The other pole post unit 40 is a negative pole post unit and is electrically connected to the negative tab of the battery cell. Hereinafter, the structure of one pole post unit 40 will be described in detail as an example.

[0051] Please refer to Figures 8 to 10 , Figure 8 is Figure 3 the exploded structural schematic view of the pole post unit 40 in the end cover assembly 120 shown in Figure 9 is Figure 8 the structural schematic view of the upper plastic 41 in the pole post unit 40 shown in Figure 10 is Figure 9 the cross-sectional structural schematic view of the upper plastic 41 after being cut along C-C shown in

[0052] The pole post unit 40 includes an upper plastic 41, a pole post 42, a sealing member 43, and a compression ring 44. The upper plastic 41, the sealing member 43, and the compression ring 44 are all sleeved on the pole post 42. The upper plastic 41 is arranged in one assembly hole 203 of the cover plate 20 and is located between the cover plate 20 and the pole post 42, so as to avoid the short circuit problem caused by the direct contact between the pole post 42 and the cover plate 20.

[0053] Specifically, the upper plastic 41 is provided with a third through hole 412, a third mounting groove 411, a first recess 415, a second recess 416, and a third recess 417. The third through hole 412 penetrates the upper plastic 41 along the thickness direction (the Z-axis direction shown in the figure) of the upper plastic 41. The opening of the third mounting groove 411 is located on the surface of the upper plastic 41 away from the cover plate 20. The third mounting groove 411 is recessed from the surface of the upper plastic 41 away from the cover plate 20 to the direction of the cover plate 20. The third mounting groove 411 is arranged around the third through hole 412 and is in communication with the third through hole 412. The groove wall surface of the third mounting groove 411 includes a third groove bottom wall surface 411a and a third groove side wall surface 411b. The third groove bottom wall surface 411a is arranged opposite to the opening of the third mounting groove 411. The third groove side wall surface 411b is arranged around the third groove bottom wall surface 411a and is connected with the third groove bottom wall surface 411a.

[0054] The opening of the first recess 415 is located at the third groove bottom wall surface 411a, and the first recess 415 is in communication with the third through hole 412. The first recess 415 is recessed from the third groove bottom wall surface 411a towards the direction of the cover plate 20, and penetrates the hole wall surface of the third through hole 412, so that the first recess 415 is in communication with the third through hole 412. The opening of the second recess 416 is located at the third groove side wall surface 411b, and the second recess 416 is in communication with the first recess 415. Specifically, the second recess 416 is recessed from the groove side wall surface of the third mounting groove 411 towards the direction away from the third mounting groove 411, and penetrates the groove wall surface of the first recess 415 and the surface of the upper plastic 41 away from the cover plate 20.

[0055] The opening of the third recess 417 is located at the surface of the upper plastic 41 facing the cover plate 20. The third recess 417 is recessed from the surface of the upper plastic 41 facing the cover plate 20 towards the direction away from the cover plate 20, and penetrates the circumferential side surface of the upper plastic 41, and is in communication with one assembly hole 203 of the cover plate 20. With this arrangement, the false seal caused by the surface of the upper plastic 41 facing the cover plate 20 being pressed too tightly against the second surface 22 of the cover plate 20 can be avoided, the problem that the sealing performance of the welding or other sealing parts of the end cover assembly 120 is not easy to detect when it is abnormal can be solved, and thus the outflow rate of defective products can be reduced and the production quality of the energy storage device 100 can be improved.

[0056] The upper plastic 41 further includes a main body part 413 and an extension part 414, and the extension part 414 is fixedly connected to the main body part 413. Specifically, the main body part 413 is located on the side of the second surface 22 of the cover plate 20 away from the first surface 21. The main body part 413 is provided with the third mounting groove 411, the third through hole 412, the first recess 415, the second recess 416 and the third recess 417. Among them, the opening of the third mounting groove 411 is located at the surface of the main body part 413 away from the cover plate 20, and the opening of the third recess 417 is located at the surface of the main body part 413 facing the cover plate 20. The extension part 414 is fixedly connected to the side of the main body part 413 facing the cover plate 20. Among them, the extension part 414 is arranged around the circumferential side of the third through hole 412. Specifically, the extension part 414 is mounted in one assembly hole 203 of the cover plate 20.

[0057] Please refer to Figure 8 and Figure 11 , Figure 11 is Figure 8 the cross-sectional structure diagram of the pole column 42 in the pole column unit 40 shown in FIG. 4 after being cut along D-D.

[0058] The pole column 42 is arranged through the third through hole 412 of the upper plastic 41, one assembly hole 203 of the cover plate 20 and one mounting hole 103 of the lower plastic 10. For example, the pole column 42 is a negative pole column. In some other embodiments, the pole column 42 can also be a positive pole column, and the embodiments of the present application do not make strict limitations in this regard.

[0059] In the embodiment, the pole post 42 comprises a fitting portion 421, a fixing portion 422 and a flange portion 423, and the fitting portion 421 and the fixing portion 422 are located on one side of the flange portion 423 in the thickness direction. Specifically, the fitting portion 421 is arranged through the third through hole 412 of the upper plastic 41, one assembly hole 203 of the cover plate 20 and one mounting hole 103 of the lower plastic 10. In other words, the extension portion 414 of the upper plastic 41 is located between the circumferential side surface of the fitting portion 421 of the pole post 42 and the hole wall surface of the assembly hole 203. The fixing portion 422 is located on the side of the first surface 21 away from the second surface 22, and is fixedly connected to the fitting portion 421. Among them, the circumferential side surface of the fitting portion 421 is arranged around the circumferential side surface of the fixing portion 422, and the circumferential side surface of the fitting portion 421 protrudes towards the hole wall surface of the assembly hole 203 of the cover plate 20.

[0060] The flange portion 423 is fixedly connected to the side of the fitting portion 421 away from the fixing portion 422, and is mounted on the third mounting groove 411 of the upper plastic 41. In other words, the main body portion 413 of the upper plastic 41 is located between the flange portion 423 and the cover plate 20. Among them, the circumferential side surface of the flange portion 423 protrudes relative to the circumferential side surface of the fitting portion 421.

[0061] In the embodiment, since the upper plastic 41 is provided with the first recess 415 and the second recess 416, on the one hand, the first recess 415 can prevent the surface of the flange portion 423 of the pole post 42 from being pressed too tightly towards the third groove bottom wall surface 411a, so as to avoid the false sealing state between the flange portion 423 of the pole post 42 and the upper plastic 41, and on the other hand, when the size of the flange portion 423 of the pole post 42 is slightly larger than the size of the third mounting groove 411, the second recess 416 can prevent the circumferential side surface of the flange portion 423 from being pressed too tightly with the third groove side wall surface 411b. With the above arrangement, the false sealing caused by the upper plastic 41 and the flange portion 423 of the pole post 42 being pressed too tightly can be avoided, the problem that the sealing performance of the welding or other sealing parts of the end cover assembly 120 is not easy to detect when the sealing performance is abnormal can be solved, so as to reduce the outflow rate of poor sealing products and improve the production quality of the energy storage device 100.

[0062] It should be noted that in actual production process, there is usually an assembly gap between the circumferential side surface of the flange portion 423 and the third groove side wall surface 411b of the upper plastic 41, and the second recess 416 can not be arranged on the upper plastic 41. At this time, the upper plastic 41 only needs to be provided with the first recess 415, so as to avoid the false sealing caused by the upper plastic 41 and the flange portion 423 of the pole post 42 being pressed too tightly.

[0063] Please refer to Figure 4 , Figure 12 and Figure 13 , Figure 12 is Figure 8Structure diagram of the sealing member 43 in the shown pole post unit 40, Figure 13 is Figure 12 Structure diagram of the sealing member 43 along the E-E section.

[0064] In this embodiment, the sealing member 43 is made of at least one of fluororubber, perfluoroether rubber, fluorosilicone rubber, silicone rubber, polyacrylate rubber and ethylene-propylene-diene rubber, so that the sealing member 43 has good heat resistance. For example, the sealing member 43 is made of fluororubber.

[0065] The sealing member 43 is arranged in a mounting hole 103 of the lower plastic 10, and abuts against the cover plate 20 and the lower plastic 10, and is sleeved on the fixed part 422 of the pole post 42, and is arranged around the extension part 414 of the upper plastic 41. In this embodiment, the sealing member 43 is provided with a first through hole 431 and a first mounting groove 435. The first through hole 431 penetrates the sealing member 43 along the thickness direction of the sealing member 43, and is in communication with a mounting hole 203 of the cover plate 20. The first through hole 431 is used for mounting the fixed part 422 of the pole post 42. In other words, when the sealing member 43 is assembled with the pole post 42, the fixed part 422 of the pole post 42 also penetrates the first through hole 431 of the sealing member 43.

[0066] The opening of the first mounting groove 435 is located on the surface of the sealing member 43 away from the cover plate 20. The first mounting groove 435 is arranged around the first through hole 431 and is in communication with the first through hole 431. Specifically, the first mounting groove 435 is recessed from the surface of the sealing member 43 away from the cover plate 20 to the direction of the cover plate 20, and penetrates the hole wall surface of the first through hole 431, so that the first mounting groove 435 is in communication with the first through hole 431. The groove wall surface of the first mounting groove 435 includes a first groove bottom wall surface 435a and a first groove side wall surface 435b. The first groove bottom wall surface 435a is arranged opposite to the opening of the first mounting groove 435. The first groove side wall surface 435b is arranged around the first groove bottom wall surface 435a and is connected with the first groove bottom wall surface 435a.

[0067] In this embodiment, the sealing member 43 includes a first sealing part 43a and a second sealing part 43b connected with each other. The first sealing part 43a is arranged in a mounting hole 103 of the lower plastic 10 and abuts against the cover plate 20. The first sealing part 43a is provided with the first through hole 431. Specifically, the first through hole 431 penetrates the first sealing part 43a along the thickness direction of the first sealing part 43a.

[0068] The second sealing part 43b is connected to the side of the first sealing part 43a away from the fixed part 422 of the pole 42, and is arranged around the periphery of the first sealing part 43a and abuts against the lower plastic 10. Specifically, the second sealing part 43b is mounted in a second mounting groove 104 of the lower plastic 10. The second sealing part 43b and the first sealing part 43a form the first mounting groove 435.

[0069] Specifically, the second sealing part 43b includes a first part 432 and a second part 433. The first part 432 is connected to the side of the first sealing part 43a away from the pole 42, and is arranged around the first sealing part 43a and abuts against the second groove bottom wall surface 104a of a second mounting groove 104 of the lower plastic 10. The first part 432 is provided with a gas permeable hole 434. The gas permeable hole 434 penetrates the first part 432 along the thickness direction of the first part 432, and is arranged in a spaced manner with the first sealing part 43a. In this embodiment, the gas permeable hole 434 has a plurality of holes. The plurality of gas permeable holes 434 are arranged around the first sealing part 43a and are arranged in a spaced manner with each other.

[0070] When the sealing part 43 is mounted in a second mounting groove 104 of the lower plastic 10, each boss 11 of the lower plastic 10 is inserted into a gas permeable hole 434 of the sealing part 43 and is in interference fit with the gas permeable hole 434. With this arrangement, the electrolyte inside the energy storage device 100 can be prevented from seeping between the boss 11 and the hole wall surface of the gas permeable hole 434 into the space between the cover plate 20 and the first part 432 of the sealing part 43, thereby avoiding short circuit breakdown of the energy storage device 100 during short circuit and voltage test, preventing the energy storage device 100 from catching fire and exploding, and thus helping to improve the safety and reliability of the energy storage device 100.

[0071] Each gas permeable hole 434 includes a first sub-hole 434a and a second sub-hole 434b. The first sub-hole 434a is located on the side of the second sub-hole 434b away from the first mounting groove 435, and is in communication with the second sub-hole 434b. The hole diameter of the first sub-hole 434a gradually decreases in the direction from the first sub-hole 434a to the second sub-hole 434b. It can be understood that by gradually reducing the hole diameter of the first sub-hole 434a, the boss 11 of the lower plastic 10 can be easily inserted into the gas permeable hole 434, and the boss 11 can also be prevented from being scratched by the hole wall surface of the gas permeable hole 434.

[0072] The second part 433 is connected to the side of the first part 432 away from the first sealing part 43a, and is arranged around the first part 432 and intersects with the first part 432, wherein the second part 433 abuts against the second groove side wall surface 104b of a second mounting groove 104 of the lower plastic 10.

[0073] In the embodiment, the sealing member 43 further comprises a protruding rib 43c. The protruding rib 43c is arranged on the surface of the second groove side wall surface 104b of the second mounting groove 104 of the lower plastic 10 facing the second portion 433 of the sealing member 43, and surrounds the second portion 433 and abuts against the second groove side wall surface 104b.

[0074] It can be understood that the protruding rib 43c can seal the gap between the surface of the second portion 433 of the sealing member 43 facing the second groove side wall surface 104b and the second groove side wall surface 104b, prevent the electrolyte inside the energy storage device 100 from seeping into the gap between the second portion 433 of the sealing member 43 and the second groove side wall surface 104b, and then between the cover plate 20 and the first portion 432 of the sealing member 43, thereby avoiding the short circuit breakdown problem of the energy storage device 100 in the short circuit and voltage test, preventing the energy storage device 100 from catching fire and exploding, and further helping to improve the safety and reliability of the energy storage device 100.

[0075] Please refer to Figure 4 , Figure 14 and Figure 15 , Figure 14 is Figure 8 the structure diagram of the pressure ring 44 in the pole column unit 40 shown in Figure 15 is Figure 14 the cross-sectional structure diagram of the pressure ring 44 along F-F shown in

[0076] In the embodiment, the pressure ring 44 is mounted in the first mounting groove 435 of the sealing member 43, and is sleeved on and fixedly connected with the fixed portion 422 of the pole column 42. The pressure ring 44 comprises a circumferential side surface 442 and a third surface 443 facing the cover plate 20, and the third surface 443 is fixedly connected with the circumferential side surface 442. The circumferential side surface 442 abuts against the first groove side wall surface 435b of the sealing member 43, and the third surface 443 abuts against the first groove bottom wall surface 435a of the sealing member 43.

[0077] It can be understood that in the assembly process of the pressure ring 44 and the sealing member 43, the air vent hole 434 arranged on the sealing member 43 can exhaust the gas between the pressure ring 44 and the sealing member 43, avoid the gas from being trapped between the pressure ring 44 and the sealing member 43, prevent the pressure ring 44 and the sealing member 43 from having a significant gap, and ensure that the pressure ring 44 and the sealing member 43 are smoothly assembled and closely contacted, thereby facilitating the subsequent assembly of the pressure ring 44 and the sealing member 43 as a whole structure with other structures of the end cover assembly 120.

[0078] In the embodiment, the compression ring 44 is provided with a second through hole 444 and a notch 441. The second through hole 444 penetrates the compression ring 44 along the thickness direction of the compression ring 44 and is in communication with the first through hole 431 of the sealing member 43 and the third through hole 412 of the upper plastic 41. The second through hole 444 is used to mount the fixed part 422 of the pole 42. In other words, when the compression ring 44 is assembled with the pole 42, the fixed part 422 of the pole 42 is arranged in the second through hole 444 of the compression ring 44 and is fixedly connected with the compression ring 44. At this time, the third surface 443 of the compression ring 44 abuts against the surface of the fitting part 421 of the pole 42 facing the fixed part 422.

[0079] The notch 441 is arranged on the third surface 443 of the compression ring 44 and penetrates the hole wall surface of the second through hole 444. For example, the notch 441 has a plurality of notches. The plurality of notches are arranged at intervals. It can be understood that, after the compression ring 44 is assembled with the pole 42, because the third surface 443 of the compression ring 44 abuts against the surface of the fitting part 421 of the pole 42 facing the fixed part 422, by arranging the notch 441 on the compression ring 44, the false sealing state caused by the third surface 443 of the compression ring 44 and the surface of the fitting part 421 of the pole 42 facing the fixed part 422 being pressed too tightly can be avoided, the problem that the sealing performance of the welding part or other sealing part of the end cover assembly 120 is not easy to detect when the sealing performance is abnormal can be solved, so that the outflow rate of defective products can be reduced and the production quality of the energy storage device 100 can be improved.

[0080] In the assembly process of the end cover assembly 120, the compression ring 44 is first mounted to the first mounting groove 435 of the sealing member 43, and then the compression ring 44 and the sealing member 43 are assembled with other components of the end cover assembly 120 as a whole structure. At this time, the peripheral side surface 442 of the compression ring 44 can position the sealing member 43 to prevent the sealing member 43 from being misaligned, solve the problem of the edge being overlapped caused by positioning the sealing member 43 by the extension part 414 of the upper plastic 41, and avoid the sealing member 43 being damaged, so that the sealing performance of the end cover assembly 120 can be ensured to be good, and then the risk of liquid leakage of the energy storage device 100 can be reduced and the safety and reliability of the energy storage device 100 can be improved. In addition, in the transportation process of the end cover assembly 120, the peripheral side surface 442 of the compression ring 44 can also limit the sealing member 43 to prevent the sealing member 43 from moving in the transportation process, so that the sealing performance of the end cover assembly 120 can also be ensured to be good, and then the risk of liquid leakage of the energy storage device 100 can also be reduced and the safety and reliability of the energy storage device 100 can also be improved.

[0081] When the compression ring 44 and the sealing member 43 are assembled as a whole structure with other components of the end cap assembly 120, the compression ring 44 will extrude the sealing member 43. At this time, the first sealing part 43a of the sealing member 43 is clamped between the cover plate 20 and the compression ring 44 to achieve sealing between the compression ring 44 and the cover plate 20. The second sealing part 43b of the sealing member 43 is clamped between the compression ring 44 and the lower plastic 10 to achieve sealing between the lower plastic 10 and the compression ring 44. The convex rib 43c of the sealing member 43 abuts against the second groove side wall surface 104b to achieve sealing between the second part 433 of the sealing member 43 and the second groove side wall surface 104b.

[0082] When the compression ring 44 extrudes the sealing member 43, the convex rib 43c of the sealing member 43 and the second groove side wall surface 104b of the lower plastic 10 generate a frictional force, so that the lower plastic 10 moves in the direction of the cover plate 20, reducing the assembly gap between the lower plastic 10 and the cover plate 20. Not only can the lower plastic 10 and the cover plate 20 be extruded tightly to enhance the assembly reliability between the lower plastic 10 and the cover plate 20 and prevent the lower plastic 10 and the cover plate 20 from falling off, but also can prevent the electrolyte inside the energy storage device 100 from seeping into the cover plate 20 and the second part 433 of the sealing member 43 through the gap between the lower plastic 10 and the cover plate 20, thereby avoiding short circuit breakdown of the energy storage device 100 in short circuit and voltage test, preventing the energy storage device 100 from catching fire and exploding, and further helping to improve the safety and reliability of the energy storage device 100.

[0083] Finally, the compression ring 44 and the fixing part 422 of the pole 42 are laser welded to achieve fixed connection of the compression ring 44 and the pole 42. It can be understood that the heat resistance of the sealing member 43 made of fluororubber material is higher than that of the lower plastic 10. When the compression ring 44 and the pole 42 are welded, since the second sealing part 43b of the sealing member 43 is clamped between the lower plastic 10 and the compression ring 44, the sealing member 43 can act as a heat insulation layer, which can reduce the laser heat transferred to the lower plastic 10 when the compression ring 44 and the pole 42 are welded, thereby reducing the risk of thermal melting of the lower plastic 10.

[0084] Please refer again to Figure 4When the end cover assembly 120 is completed, the second part 433 of the sealing member 43 is exposed relative to the lower plastic 10. At this time, the second part 433 of the sealing member 43 can be used as an identifiable feature of the sealing member 43. When the production personnel observe the end cover assembly 120 from the direction of the grommet 44 to the cover plate 20, if the production personnel can directly observe the second part 433, it indicates that the sealing member 43 has been assembled inside the end cover assembly 120, and if the production personnel cannot observe the second part 433, it indicates that the sealing member 43 has not been assembled inside the end cover assembly 120. With this arrangement, the sealing member 43 can be visualized, which helps the production personnel quickly determine whether the sealing member 43 has been assembled inside the end cover assembly 120, thereby helping to reduce the outflow rate of unqualified products and improve the production quality of the energy storage device 100.

[0085] The present application also provides a power-using device, which includes the above-mentioned energy storage device 100, and the energy storage device 100 supplies power to the power-using device. The power-using device can be a new energy vehicle, a power storage station, a server, or other devices that need power.

[0086] The above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An end cap assembly for an energy storage device, characterized in that: The end cap assembly includes a cover plate, a lower plastic, a pole, a pressure ring and a seal. The cover plate includes a first surface and a second surface. Along the thickness direction of the cover plate, the first surface and the second surface are arranged opposite to each other. The cover plate is provided with an assembly hole, and the assembly hole passes through the first surface and the second surface. The lower plastic is located on a side of the first surface facing away from the second surface, and the lower plastic is provided with a mounting hole, the mounting hole passes through the lower plastic along the thickness direction of the lower plastic and is connected to the assembly hole; The sealing member is provided in the mounting hole and abuts against the cover plate and the lower plastic. The sealing member is provided with a first through hole and a first mounting groove. The first through hole penetrates the sealing member along the thickness direction of the sealing member and is communicated with the assembly hole. The opening of the first mounting groove is located on the surface of the sealing member away from the cover plate. The first mounting groove is provided around the first through hole and is communicated with the first through hole. The groove wall surface of the first mounting groove includes a first groove bottom wall surface and a first groove side wall surface. The first groove bottom wall surface is arranged opposite to the opening of the first mounting groove. The first groove side wall surface is arranged around the first groove bottom wall surface and is connected to the first groove bottom wall surface. The pressing ring is installed in the first installation groove, and the pressing ring includes a peripheral side surface and a third surface facing the cover plate, the peripheral side surface abuts the side wall of the first groove, and the third surface abuts the bottom wall of the first groove. The pressing ring is provided with a second through hole, and the second through hole passes through the pressing ring along the thickness direction of the pressing ring and is connected to the first through hole; The pole is passed through the assembly hole, the mounting hole, the first through hole and the second through hole, and is fixedly connected to the pressure ring.

2. The end cap assembly according to claim 1, wherein: The sealing member includes a first sealing portion and a second sealing portion. The first sealing portion is passed through the mounting hole and clamped between the cover plate and the pressure ring. The first sealing portion is provided with the first through hole. The second sealing portion is connected to the side of the first sealing portion facing away from the pole, and is arranged around the first sealing portion and clamped between the lower plastic and the pressure ring. The second sealing portion and the first sealing portion enclose the first mounting groove.

3. The end cap assembly according to claim 2, wherein: The lower plastic is further provided with a second mounting groove, the opening of the second mounting groove is located on the surface of the lower plastic facing away from the cover plate, the second mounting groove is arranged around the mounting hole and is in communication with the mounting hole, the groove wall surface of the second mounting groove includes a second groove bottom wall surface and a second groove side wall surface, the second groove bottom wall surface is arranged opposite to the opening of the second mounting groove, and the second groove side wall surface is arranged around the second groove bottom wall surface and is connected to the second groove bottom wall surface; The second sealing portion is installed in the second mounting groove, and the second sealing portion includes a first part and a second part. The first part is connected to the side of the first sealing portion facing away from the pole, and is arranged around the first sealing portion, and is clamped between the bottom wall of the second groove and the third surface. The second part is connected to the side of the first part facing away from the first sealing portion, and is arranged around the first part, and is clamped between the side wall of the second groove and the peripheral side surface.

4. The end cap assembly according to claim 3, wherein: The first portion is provided with an air vent, which passes through the first portion along a thickness direction of the first portion, is communicated with the first mounting groove, and is spaced apart from the first sealing portion.

5. The end cap assembly according to claim 4, wherein: The lower plastic is also provided with a boss, which is provided on the bottom wall of the second groove and protrudes along the bottom wall of the second groove toward the pressure ring and is spaced apart from the mounting hole. The boss is inserted into the air vent and has an interference fit with the air vent.

6. The end cap assembly according to any one of claims 3 to 5, characterized in that: The sealing member further includes a convex rib, which is provided on a surface of the second portion facing the second groove side wall surface, is circumferentially arranged around the second portion, and abuts against the second groove side wall surface.

7. The end cap assembly according to claim 1, wherein: The pole includes a matching portion and a fixing portion, the matching portion being provided through the assembly hole, the mounting hole, and the first through hole, the fixing portion being located on a side of the first surface facing away from the second surface, and being fixedly connected to the matching portion, and being provided through the second through hole, wherein the peripheral side surface of the matching portion is arranged around the peripheral side surface of the fixing portion, and protrudes relative to the peripheral side surface of the fixing portion toward the hole wall surface of the assembly hole, and the surface of the matching portion facing the fixing portion abuts against the third surface; The pressure ring is provided with a notch, the opening of the notch is located on the third surface, and the notch passes through the wall surface of the second through hole.

8. The end cap assembly according to claim 7, wherein: The end cap assembly further includes an upper plastic, the upper plastic is penetrated by the assembly hole and the first through hole, and abuts against the third surface, the upper plastic is provided with a third through hole, a third mounting groove and a first groove, the third through hole penetrates the upper plastic along the thickness direction of the upper plastic, and is communicated with the second through hole, the opening of the third mounting groove is located on the surface of the upper plastic away from the pressure ring, the third mounting groove is arranged around the third through hole, and is communicated with the third through hole, the groove wall surface of the third mounting groove includes a third groove bottom wall surface, the third groove bottom wall surface is arranged opposite to the opening of the third mounting groove, the opening of the first groove is located on the third groove bottom wall surface, the first groove penetrates the hole wall surface of the third through hole, and is communicated with the third through hole; The matching portion is further provided through the third through hole. The pole further includes a flange portion connected to a side of the matching portion away from the fixing portion and installed in the third installation slot.

9. The end cap assembly according to claim 8, wherein: The groove wall surface of the third installation groove further includes a third groove side wall surface, and the third groove side wall surface is arranged around the third groove bottom wall surface and connected to the third groove bottom wall surface; The upper plastic is further provided with a second groove, the opening of the second groove is located on the side wall of the third groove, the second groove passes through the surface of the upper plastic facing away from the pressure ring, and is communicated with the first groove.

10. The end cap assembly according to claim 8 or 9, characterized in that: The upper plastic is further provided with a third groove, the opening of which is located on the surface of the upper plastic facing the cover plate, and the third groove passes through the peripheral side surface of the upper plastic and is communicated with the assembly hole.

11. An energy storage device, characterized in that: The invention comprises a shell and an end cover assembly according to any one of claims 1 to 10, wherein the end cover assembly is mounted on the shell and closes an opening of the shell.

12. An electrical device, characterized in that: The energy storage device comprises the energy storage device as claimed in claim 11, wherein the energy storage device supplies power to the electrical equipment.

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