End cover assembly, energy storage device and electric equipment

Abstract

The invention provides an end cover assembly, an energy storage device and electric equipment, which can prevent a sealing element from playing or shifting in a production or transportation process and ensure good sealing performance of the end cover assembly. The end cover assembly comprises a cover plate, lower plastic cement, a pole, a pressing ring and a sealing piece, and the cover plate is provided with an assembling hole; a mounting hole is formed in the lower plastic and is communicated with the assembly hole; the sealing piece penetrates through the mounting hole and abuts against the cover plate and the lower plastic, the sealing piece is provided with a first through hole and a first mounting groove, the first through hole is communicated with the assembling hole, an opening of the first mounting groove is located in the surface, away from the cover plate, of the sealing piece, and the first mounting groove surrounds the first through hole; the pressing ring is installed in the first installation groove, the peripheral side face of the pressing ring abuts against the groove side wall face of the first installation groove, the surface, facing the cover plate, of the pressing ring abuts against the groove bottom wall face of the first installation groove, the pressing ring is provided with a second through hole, and the second through hole communicates with the first through hole; and the pole penetrates through the assembly hole, the mounting hole, the first through hole and the second through hole and is fixedly connected with the pressing ring.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an end cover assembly, an energy storage device and an electrical equipment. Background Art

[0002] A secondary battery (rechargeable battery), also known as a rechargeable battery or storage battery, refers to a battery that can be recharged to activate the active material and continue to be used after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people's requirements for the energy density and reliability of secondary batteries are also getting higher and higher. However, in existing secondary batteries, the seals of the end cap assembly are prone to movement during production or transportation, resulting in poor sealing of the end cap assembly, resulting in the risk of leakage in the secondary battery, reducing the safety and reliability of the secondary battery. Summary of the invention

[0003] The present application provides an end cover assembly, an energy storage device and an electrical equipment, which can prevent the seal from moving or shifting during production or transportation, ensure the good sealing of the end cover assembly, reduce the risk of leakage of the energy storage device, and improve the safety and reliability of the energy storage device.

[0004] In the first aspect, the present application provides an end cover assembly for use in an energy storage device. The end cover 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 the side of the first surface away from the second surface, and the lower plastic is provided with a mounting hole, and the mounting hole passes through the lower plastic along the thickness direction of the lower plastic and is connected to the assembly hole; the seal is penetrated through the mounting hole and abuts against the cover plate and the lower plastic. The seal is provided with a first through hole and a first mounting groove, and the first through hole passes through the seal along the thickness direction of the seal and is connected to the assembly hole, and the opening of the first mounting groove is located on the side of the seal away from the cover The surface of the plate, the first mounting groove is arranged around the first through hole and is connected with the first through hole, the first mounting groove has a first groove bottom wall and a first groove side wall, the first groove bottom wall is arranged opposite to the opening of the first mounting groove, the first groove side wall is arranged around the first groove bottom wall and is connected with the first groove bottom wall; the pressing ring is installed in the first mounting groove, the pressing ring includes a peripheral side surface and a third surface facing the cover plate, the peripheral side surface abuts the first groove side wall surface, the third surface abuts the first groove bottom wall surface, the pressing ring is provided with a second through hole, the second through hole penetrates the pressing ring along the thickness direction of the pressing ring, and is connected with the first through hole; the pole is penetrated by the assembly hole, the mounting hole, the first through hole and the second through hole, and is fixedly connected with the pressing ring.

[0005] Wherein, the sealing member includes a first sealing portion and a second sealing portion, the first sealing portion is penetrated 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 away from the pole, and is arranged around the first sealing portion, and is clamped between the lower plastic and the pressure ring, wherein the second sealing portion and the first sealing portion enclose the first mounting groove.

[0006] Wherein, the lower plastic is also provided with a second mounting groove, the opening of the second mounting groove is located on the surface of the lower plastic away from the cover plate, the second mounting groove is arranged around the mounting hole, and is connected to 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, 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 sealing member 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 away from the pole, and is arranged around the first sealing portion, and is clamped between the second groove bottom wall surface and the third surface, the second part is connected to the side of the first part away from the first sealing portion, and is arranged around the first part, and is clamped between the second groove side wall surface and the peripheral side surface.

[0007] The first part is provided with an air hole, which penetrates the first part along the thickness direction of the first part, is communicated with the first installation groove, and is spaced apart from the first sealing part.

[0008] Among them, the lower plastic is also provided with a boss, which is arranged 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 hole and has an interference fit with the air hole.

[0009] Wherein, the sealing member further comprises a convex rib, which is arranged 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.

[0010] In which, the pole includes a matching portion and a fixing portion, the matching portion is penetrated through the assembly hole, the mounting hole and the first through hole, the fixing portion is located on the side of the first surface away from the second surface, and is fixedly connected to the matching portion, and is penetrated 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 in the direction of the hole wall surface close to the assembly hole relative to the peripheral side surface of the fixing portion, 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 penetrates the hole wall surface of the second through hole.

[0011] Wherein, the end cover assembly also includes an upper plastic, the upper plastic is penetrated through 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 also penetrated through the third through hole, and the pole also includes a flange portion, the flange portion is connected to the side of the matching portion away from the fixing portion, and is installed in the third mounting groove.

[0012] Among them, the groove wall surface of the third installation groove also includes a third groove side wall surface, and the third groove side wall surface is arranged around the third groove bottom wall surface and is connected to the third groove bottom wall surface; the upper plastic is also provided with a second groove, the opening of the second groove is located on the third groove side wall surface, the second groove penetrates the surface of the upper plastic away from the pressure ring, and is connected to the first groove.

[0013] The upper plastic is further provided with a third groove, the opening of the third groove is located on the surface of the upper plastic facing the cover plate, the third groove penetrates the peripheral side surface of the upper plastic, and is connected with the assembly hole.

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

[0015] In a third aspect, the present application further provides an electrical device, comprising the energy storage device as described above, wherein the energy storage device supplies power to the electrical device.

[0016] In the end cap assembly provided by the present application, by installing the pressure ring into the first mounting groove, and assembling the pressure ring and the seal as an integral structure with other components of the end cap assembly, the surrounding side of the pressure ring can position the seal to prevent the seal from being installed skewed, solve the overlap problem caused by relying on the upper plastic to position the seal, and avoid the seal from being damaged, so as to ensure the good sealing of the end cap assembly, thereby helping to reduce the risk of leakage of the energy storage device and improve the safety and reliability of the energy storage device. At the same time, when the production personnel observe the end cap assembly from the pressure ring to the cover plate, the production personnel can directly observe the seal, so that the seal can be visualized, which can assist the production personnel to quickly determine whether the seal is assembled inside the end cap assembly, which helps to reduce the outflow rate of unqualified products and improve the production quality of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0018] Figure 1 is a schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of the end cover assembly in the energy storage device shown;

[0020] Figure 3 yes Figure 2 An exploded structural diagram of the end cap assembly shown;

[0021] Figure 4 yes Figure 2 The cross-sectional structure diagram of the end cover assembly after being cut along AA;

[0022] Figure 5 yes Figure 3 A schematic diagram of the structure of the lower plastic in the end cover assembly shown at another angle;

[0023] Figure 6 yes Figure 5 The structure diagram of the lower plastic after being cut open along BB;

[0024] Figure 7 yes Figure 3 A schematic diagram of the structure of the cover plate in the end cover assembly shown;

[0025] Figure 8 yes Figure 3 A schematic diagram of the exploded structure of the pole unit in the end cover assembly shown;

[0026] Fig. 9 yes Figure 8 The schematic diagram of the structure of the upper plastic in the pole unit shown;

[0027] Fig.10 yes Fig. 9 The cross-sectional structure diagram of the upper plastic after being cut along CC;

[0028] Fig.11 yes Figure 8 The cross-sectional structure diagram of the pole in the pole unit after being cut along DD;

[0029] Fig.12 yes Figure 8 A schematic diagram of the structure of the sealing member in the pole unit shown;

[0030] Fig.13 yes Fig.12 The schematic diagram of the cross-sectional structure of the seal after being cut along EE is shown;

[0031] Fig.14 yes Figure 8 The schematic diagram of the structure of the pressure ring in the pole unit is shown;

[0032] Fig.15 yes Fig.14 The cross-sectional structure diagram of the pressure ring after being cut along FF is shown.

[0033] The names corresponding to the reference numerals in the figures are:

[0034] Energy storage device 100, housing 110, end cover assembly 120, lower plastic 10, cover plate 20, explosion-proof valve 30, pole 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, pole 42, seal 43, pressure ring 44, third through hole 412, third mounting groove 411, third groove bottom wall surface 411a, third groove side wall surface 411b 11b, first groove 415, second groove 416, third groove 417, main body 413, extension portion 414, matching portion 421, fixing portion 422, flange portion 423, first through hole 431, first mounting groove 435, first groove bottom wall 435a, first groove side wall 435b, first sealing portion 43a, second sealing portion 43b, first portion 432, second portion 433, air vent 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 clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0036] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of the energy storage device 100 provided in an embodiment of the present application. For the convenience 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. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0037] The energy storage device 100 includes a housing 110, a battery cell (not shown) and an end cap assembly 120. The housing 110 has an opening (not shown) and a receiving cavity (not shown), and the opening is connected to the receiving cavity. The battery cell is received in the receiving cavity. The receiving cavity is also used to receive an electrolyte, and the battery cell is immersed in the electrolyte. The end cap assembly 120 is mounted on the housing 110 and closes the opening of the housing 110. Exemplarily, the energy storage device 100 is a square battery. In some other embodiments, the energy storage device 100 may also be a cylindrical battery or other batteries.

[0038] See also Figures 2 to 4 , Figure 2 yes Figure 1 The schematic diagram of the structure of the end cover assembly 120 in the energy storage device 100 is shown. Figure 3 yes Figure 2 The exploded structural diagram of the end cap assembly 120 is shown in FIG. Figure 4 yes Figure 2 The cross-sectional structure diagram of the end cap assembly 120 is shown after being cut along AA. Wherein, "cut along AA" means cutting along the plane where the AA line is located, and similar descriptions in the following text can be understood in the same way.

[0039] The end cap assembly 120 includes a lower plastic 10, a cover plate 20, an explosion-proof valve 30 and two pole units 40. The lower plastic 10 is installed on one side of the thickness direction of the cover plate 20. The explosion-proof valve 30 and the two pole 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 units 40 are respectively located on opposite sides of the explosion-proof valve 30.

[0040] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 5 yes Figure 3 The schematic diagram of the structure of the lower plastic 10 in the end cap assembly 120 at another angle is shown. Figure 6 yes Figure 5 The structure diagram of the lower plastic 10 after being cut open along BB is shown.

[0041] The lower plastic 10 includes an explosion-proof fence 101, and the explosion-proof fence 101 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 of the energy storage device 100 (the X-axis direction shown in the figure), 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 of the energy storage device 100 (the X-axis direction in the figure), 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 in the direction of the cover plate 20. Along the length direction of the lower plastic 10 (the X-axis direction shown in the figure), the two second mounting grooves 104 are arranged at intervals. Each second mounting groove 104 is arranged around the circumference of a mounting hole 103, and is connected to a mounting hole 103. Specifically, the groove wall surface of each second mounting groove 104 includes 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 to the second groove bottom wall surface 104a.

[0044] In this embodiment, the lower plastic 10 is further provided with a boss 11. The boss 11 is provided on the second groove bottom wall 104a, and protrudes along the second groove bottom wall 104a in a direction away from the second groove bottom wall 104a, and is spaced apart from the mounting hole 103. In this embodiment, a plurality of bosses 11 are provided on the second groove bottom wall 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 yes Figure 3 A schematic structural diagram of the cover plate 20 in the end cover assembly 120 is shown.

[0046] In this embodiment, the cover plate 20 includes a first surface 21 and a second surface 22. The first surface 21 and the second surface 22 are disposed opposite to each other in the thickness direction (Z-axis direction in the figure) of the cover plate 20. The first surface 21 is a side of the cover plate 20 facing the lower plastic 10, and the second surface 22 is a side of the cover plate 20 facing away from the lower plastic 10.

[0047] The cover plate 20 is also provided with an explosion-proof hole 201, an injection hole 202 and two assembly holes 203. The explosion-proof hole 201, the 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 injection hole 202 are both located in the middle of the cover plate 20. The explosion-proof hole 201 can be connected to the interior of the energy storage device 100 through the explosion-proof fence 101. Along the length direction of the cover plate 20 (the X-axis direction shown in the figure), the injection hole 202 is located on one side of the explosion-proof hole 201. The injection hole 202 is connected to the liquid inlet hole 102 of the lower plastic 10. The electrolyte can be injected into the shell 110 (such as the liquid inlet hole 202 of the cover plate 20 and the liquid inlet hole 102 of the lower plastic 10 in sequence. Figure 1 The receiving chamber is provided with a receiving chamber as shown in the figure, so as to realize the perfusion of the electrolyte of the energy storage device 100.

[0048] Along the length direction of the energy storage device 100 (the X-axis direction in the figure), 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 injection hole 202. Specifically, one assembly hole 203 is located on the side of the 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 injection hole 202. Each assembly hole 203 is connected to a mounting hole 103 of the lower plastic 10 to facilitate the installation of a pole unit 40.

[0049] Please continue reading Figure 4 and Figure 7 . The explosion-proof valve 30 is installed in the explosion-proof hole 201 and fixedly connected to the hole wall of the explosion-proof hole 201. Exemplarily, the explosion-proof valve 30 can be fixedly connected to the hole wall of the explosion-proof hole 201 by welding so as to be installed in the explosion-proof hole 201. It can be understood that since the explosion-proof hole 201 connects the inside and the outside of the energy storage device 100, when the air pressure inside the energy storage device 100 is too high, the explosion-proof valve 30 will rupture under the action of the air pressure, and the gas inside the energy storage device 100 can be discharged to the outside of the energy storage device 100 in time through the explosion-proof fence 101 of the lower plastic 10 and the explosion-proof hole 201 in turn, thereby avoiding the explosion of the energy storage device 100 and improving the reliability of the use of the energy storage device 100.

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

[0051] Please refer to Figures 8 to 10 , Figure 8 yes Figure 3 The schematic diagram of the exploded structure of the pole unit 40 in the end cover assembly 120 is shown. Fig. 9 yes Figure 8 The schematic diagram of the structure of the upper plastic 41 in the pole unit 40 is shown. Fig.10 yes Fig. 9 The cross-sectional structure diagram of the upper plastic 41 after being cut along CC is shown.

[0052] The pole unit 40 includes an upper plastic 41, a pole 42, a seal 43 and a pressure ring 44, and the upper plastic 41, the seal 43 and the pressure ring 44 are all sleeved on the pole 42. Among them, the upper plastic 41 is penetrated through an assembly hole 203 of the cover plate 20 and is located between the cover plate 20 and the pole 42 to avoid the short circuit problem caused by the direct contact between the pole 42 and the cover plate 20 of the end cover assembly 120.

[0053] Specifically, the upper plastic 41 is provided with a third through hole 412, a third mounting groove 411, a first groove 415, a second groove 416 and a third groove 417. Among them, the third through hole 412 penetrates the upper plastic 41 along the thickness direction of the upper plastic 41 (Z-axis direction in the figure). 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 toward the cover plate 20. The third mounting groove 411 is arranged around the third through hole 412 and is connected to 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 to the third groove bottom wall surface 411a.

[0054] The opening of the first groove 415 is located on the third groove bottom wall surface 411a, and the first groove 415 is connected to the third through hole 412. The first groove 415 is recessed from the third groove bottom wall surface 411a toward the cover plate 20, and penetrates the hole wall surface of the third through hole 412, so that the first groove 415 is connected to the third through hole 412. The opening of the second groove 416 is located on the third groove side wall surface 411b, and the second groove 416 is connected to the first groove 415. Specifically, the second groove 416 is recessed from the groove side wall surface of the third installation groove 411 toward the direction away from the third installation groove 411, and penetrates the groove wall surface of the first groove 415 and the surface of the upper plastic 41 away from the cover plate 20.

[0055] The opening of the third groove 417 is located on the surface of the upper plastic 41 facing the cover plate 20. The third groove 417 is recessed from the surface of the upper plastic 41 facing the cover plate 20 in the direction away from the cover plate 20, and penetrates the peripheral side surface of the upper plastic 41, and is connected with an assembly hole 203 of the cover plate 20. Under this arrangement, false sealing caused by over-tightening of the surface of the upper plastic 41 facing the cover plate 20 and the second surface 22 of the cover plate 20 can be avoided, and the problem that it is difficult to detect when the sealing performance of the welding part or other sealing parts of the end cover assembly 120 is abnormal can be solved, thereby reducing the outflow rate of defective sealing products and improving the production quality of the energy storage device 100.

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

[0057] Please refer to Figure 8 and Fig.11 , Fig.11 yes Figure 8 The cross-sectional structure diagram of the pole 42 in the pole unit 40 is shown after being cut along DD.

[0058] The pole 42 is passed through the third through hole 412 of the upper plastic 41, an assembly hole 203 of the cover plate 20, and an installation hole 103 of the lower plastic 10. Exemplarily, the pole 42 is a negative pole. In some other embodiments, the pole 42 may also be a positive pole, which is not strictly limited in the embodiments of the present application.

[0059] In this embodiment, the pole 42 includes a matching portion 421, a fixing portion 422 and a flange portion 423, wherein the matching portion 421 and the fixing portion 422 are both located on one side of the flange portion 423 in the thickness direction. Specifically, the matching portion 421 is provided through the third through hole 412 of the upper plastic 41, an assembly hole 203 of the cover plate 20 and an installation hole 103 of the lower plastic 10. In other words, the extension portion 414 of the upper plastic 41 is located between the peripheral side surface of the matching portion 421 of the pole 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 matching portion 421. Among them, the peripheral side surface of the matching portion 421 is arranged around the peripheral side surface of the fixing portion 422, and protrudes toward the direction of the hole wall surface of an assembly hole 203 close to the cover plate 20 relative to the peripheral side surface of the fixing portion 422.

[0060] The flange portion 423 is fixedly connected to the side of the matching portion 421 away from the fixing portion 422, and is installed in the third installation groove 411 of the upper plastic 41. In other words, the main body 413 of the upper plastic 41 is located between the flange portion 423 and the cover plate 20. The peripheral side surface of the flange portion 423 is protruding relative to the peripheral side surface of the matching portion 421.

[0061] In this embodiment, since the upper plastic 41 is provided with a first groove 415 and a second groove 416, on the one hand, the first groove 415 can prevent the surface of the flange 423 facing the third groove bottom wall 411a from being squeezed too tightly with the third groove bottom wall 411a, thereby avoiding the formation of a false seal between the flange 423 of the pole 42 and the upper plastic 41, and on the other hand, when the size of the flange 423 of the pole 42 is slightly larger than the size of the third mounting groove 411, the second groove 416 can prevent the false seal between the peripheral side surface of the flange 423 and the third groove side wall 411b due to excessive squeezing. Under this setting, the false seal caused by the upper plastic 41 and the flange 423 of the pole 42 being squeezed too tightly can be avoided, and the problem that the sealing performance of the welding part or other sealing parts of the end cover assembly 120 is difficult to detect when it is abnormal can be solved, thereby reducing the outflow rate of defective sealing products and improving the production quality of the energy storage device 100.

[0062] It should be noted that, in the actual production process, there is usually an assembly gap between the peripheral side surface of the flange portion 423 and the third groove side wall surface 411b of the upper plastic 41, and the second groove 416 may not be provided on the upper plastic 41. In this case, the upper plastic 41 only needs to be provided with the first groove 415 to avoid false sealing due to over-tightening of the upper plastic 41 and the flange portion 423 of the pole 42.

[0063] Please refer to Figure 4 , Fig.12 and Fig.13 , Fig.12 yes Figure 8The schematic diagram of the structure of the sealing member 43 in the pole unit 40 is shown. Fig.13 yes Fig.12 The cross-sectional structure diagram of the sealing member 43 is shown after being cut along EE.

[0064] In this embodiment, the material of the seal 43 includes at least one of fluororubber, perfluoroether rubber, fluorosilicone rubber, silicone rubber, polyacrylate rubber and EPDM rubber, so that the seal 43 has good heat resistance. Exemplarily, the seal 43 is made of fluororubber material.

[0065] The seal 43 is passed through a mounting hole 103 of the lower plastic 10, abuts the cover plate 20 and the lower plastic 10, and is sleeved on the fixing portion 422 of the pole 42, and is also arranged around the extension portion 414 of the upper plastic 41. In this embodiment, the seal 43 is provided with a first through hole 431 and a first mounting groove 435. Among them, the first through hole 431 penetrates the seal 43 along the thickness direction of the seal 43, and is connected to an assembly hole 203 of the cover plate 20. The first through hole 431 is used to install the fixing portion 422 of the pole 42. In other words, when the seal 43 is assembled with the pole 42, the fixing portion 422 of the pole 42 is also passed through the first through hole 431 of the seal 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 connected to 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 toward the cover plate 20, and penetrates the hole wall surface of the first through hole 431, so that the first mounting groove 435 is connected to the first through hole 431. Among them, 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 to the first groove bottom wall surface 435a.

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

[0068] The second sealing portion 43b is connected to the side of the first sealing portion 43a away from the fixing portion 422 of the pole 42, and is arranged around the circumference of the first sealing portion 43a, and abuts against the lower plastic 10. Specifically, the second sealing portion 43b is installed in a second installation groove 104 of the lower plastic 10. The second sealing portion 43b and the first sealing portion 43a enclose a first installation groove 435.

[0069] Specifically, the second sealing portion 43b includes a first portion 432 and a second portion 433. The first portion 432 is connected to the side of the first sealing portion 43a away from the pole 42, and is arranged around the first sealing portion 43a, and abuts against the second groove bottom wall 104a of a second mounting groove 104 of the lower plastic 10. The first portion 432 is provided with an air vent 434. The air vent 434 penetrates the first portion 432 along the thickness direction of the first portion 432, and is spaced apart from the first sealing portion 43a. In this embodiment, there are multiple air vents 434. Multiple air vents 434 are arranged around the first sealing portion 43a and are spaced apart from each other.

[0070] When the seal 43 is installed in a second installation groove 104 of the lower plastic 10, each boss 11 of the lower plastic 10 is inserted into a vent hole 434 of the seal 43 and is interference fit with a vent hole 434. Under this arrangement, the electrolyte inside the energy storage device 100 can be prevented from penetrating into the gap between the cover plate 20 and the first portion 432 of the seal 43 through the assembly gap between the boss 11 and the wall surface of the vent hole 434, thereby avoiding the short circuit breakdown problem of the energy storage device 100 during the short circuit and withstand 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 vent hole 434 includes a first sub-hole 434a and a second sub-hole 434b. The first sub-hole 434a is located on a side of the second sub-hole 434b away from the first mounting groove 435, and is connected to the second sub-hole 434b. From the first sub-hole 434a to the second sub-hole 434b, the aperture of the first sub-hole 434a gradually decreases. It can be understood that by gradually decreasing the aperture of the first sub-hole 434a, it is convenient for the boss 11 of the lower plastic 10 to be inserted into the vent hole 434, and it can also prevent the boss 11 from scratching the hole wall of the vent hole 434.

[0072] The second portion 433 is connected to a side of the first portion 432 away from the first sealing portion 43 a , surrounds the first portion 432 , and intersects with the first portion 432 , wherein the second portion 433 abuts against a second groove sidewall surface 104 b of a second installation groove 104 of the lower plastic 10 .

[0073] In this embodiment, the sealing member 43 further includes a rib 43c which is disposed on a surface of the second portion 433 facing the second groove side wall surface 104b of a second installation groove 104 of the lower plastic 10, surrounds the second portion 433, and abuts against the second groove side wall surface 104b.

[0074] It can be understood that the convex rib 43c can seal the gap between the surface of the second portion 433 facing the second groove side wall surface 104b and the second groove side wall surface 104b, preventing the electrolyte inside the energy storage device 100 from penetrating from the gap between the second portion 433 of the seal 43 and the second groove side wall surface 104b into the gap between the cover plate 20 and the first portion 432 of the seal 43, thereby avoiding short-circuit breakdown problems of the energy storage device 100 during short-circuit and withstand voltage tests, 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.

[0075] Please refer to Figure 4 , Fig.14 and Fig.15 , Fig.14 yes Figure 8 The schematic diagram of the structure of the pressure ring 44 in the pole unit 40 is shown. Fig.15 yes Fig.14 The cross-sectional structure diagram of the pressure ring 44 is shown after it is cut along FF.

[0076] In this embodiment, the pressure ring 44 is installed in the first installation groove 435 of the sealing member 43, and is sleeved on the fixing portion 422 of the pole 42, and is fixedly connected to the fixing portion 422 of the pole 42. The pressure ring 44 includes a peripheral side surface 442 and a third surface 443 facing the cover plate 20, and the third surface 443 is fixedly connected to the peripheral side surface 442. The peripheral 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 during the assembly process of the pressure ring 44 and the seal 43, the air vents 434 provided on the seal 43 can allow the gas between the pressure ring 44 and the seal 43 to be discharged, avoiding the phenomenon of holding and trapping of air between the pressure ring 44 and the seal 43, and preventing an obvious gap from appearing between the pressure ring 44 and the seal 43, thereby ensuring that the pressure ring 44 and the seal 43 are assembled smoothly and in close contact, and facilitating the subsequent assembly of the pressure ring 44 and the seal 43 as an integral structure with other structures of the end cover assembly 120.

[0078] In this embodiment, the pressure ring 44 is provided with a second through hole 444 and a notch 441. The second through hole 444 penetrates the pressure ring 44 along the thickness direction of the pressure ring 44, and is connected to the first through hole 431 of the seal 43 and the third through hole 412 of the upper plastic 41. The second through hole 444 is used to install the fixing portion 422 of the pole 42. In other words, when the pressure ring 44 is assembled with the pole 42, the fixing portion 422 of the pole 42 is penetrated by the second through hole 444 of the pressure ring 44 and is fixedly connected with the pressure ring 44. At this time, the third surface 443 of the pressure ring 44 abuts against the surface of the matching portion 421 of the pole 42 facing the fixing portion 422.

[0079] The opening of the notch 441 is located on the third surface 443 of the pressure ring 44, and the notch 441 passes through the hole wall of the second through hole 444. Exemplarily, there are multiple notches 441. Multiple notches 441 are arranged at intervals from each other. It can be understood that after the pressure ring 44 is assembled with the pole 42, since the third surface 443 of the pressure ring 44 abuts against the surface of the matching portion 421 facing the fixed portion 422, by providing the notch 441 on the pressure ring 44, a false sealing state caused by excessive squeezing of the third surface 443 of the pressure ring 44 and the surface of the matching portion 421 facing the fixed portion 422 can be avoided, and the problem that it is difficult to detect when the sealing performance of the welding part or other sealing part of the end cover assembly 120 is abnormal can be solved, thereby reducing the outflow rate of defective sealing products and improving the production quality of the energy storage device 100.

[0080] During the assembly process of the end cap assembly 120, the pressure ring 44 is first installed in the first installation groove 435 of the seal 43, and then the pressure ring 44 and the seal 43 are assembled as an integral structure with other components of the end cap assembly 120. At this time, the peripheral side surface 442 of the pressure ring 44 can position the seal 43 to prevent the seal 43 from being installed skewed, solve the overlap problem caused by relying on the extension 414 of the upper plastic 41 to position the seal 43, and avoid the seal 43 from being damaged, thereby ensuring the good sealing of the end cap assembly 120, thereby helping to reduce the risk of liquid leakage of the energy storage device 100 and improve the safety and reliability of the energy storage device 100. In addition, during the transportation of the end cap assembly 120, the peripheral side surface 442 of the pressure ring 44 can also limit the seal 43 to prevent the seal 43 from moving during transportation, thereby ensuring the good sealing of the end cap assembly 120, thereby reducing the risk of liquid leakage of the energy storage device 100 and improving the safety and reliability of the energy storage device 100.

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

[0082] When the pressure ring 44 squeezes the seal 43, friction is generated between the rib 43c of the seal 43 and the second groove side wall surface 104b of the lower plastic 10, so that the lower plastic 10 moves toward the cover plate 20, reducing the assembly gap between the lower plastic 10 and the cover plate 20. This not only squeezes the lower plastic 10 and the cover plate 20 tightly, enhances the assembly reliability between the lower plastic 10 and the cover plate 20, and prevents the lower plastic 10 and the cover plate 20 from falling off, but also prevents the electrolyte inside the energy storage device 100 from penetrating into the gap between the lower plastic 10 and the cover plate 20 and the second portion 433 of the seal 43, thereby avoiding the short circuit breakdown problem of the energy storage device 100 during the short circuit and withstand 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.

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

[0084] Please refer again Figure 4. When the end cover assembly 120 is assembled, the second part 433 of the seal 43 is exposed relative to the lower plastic 10. At this time, the second part 433 of the seal 43 can serve as an identifiable feature of the seal 43. When the production personnel observe the end cover assembly 120 from the pressure ring 44 to the direction of the cover plate 20, if the production personnel can directly observe the second part 433, it means that the seal 43 has been assembled inside the end cover assembly 120. If the production personnel do not observe the second part 433, it means that the seal 43 is not assembled inside the end cover assembly 120. Under this setting, the seal 43 can be visualized, which helps the production personnel to quickly determine whether the seal 43 is assembled inside the end cover assembly 120, which helps 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 an electric device, which includes the energy storage device 100, and the energy storage device 100 supplies power to the electric device. The electric device may be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

[0086] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application; in the absence of 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 shall be based on the protection scope of the claims.

Claims

1. An end cap assembly for an energy storage device, characterized in that: The end cap assembly comprises a cover plate, a lower plastic, a pole, a pressure ring and a seal, the cover plate comprises 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 away from the second surface, and the lower plastic is provided with a mounting hole, the mounting hole penetrates the lower plastic along the thickness direction of the lower plastic and is connected with the assembly hole; The sealing member is inserted into 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 arranged 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 with the first groove bottom wall surface. The pressing ring is installed in the first installation groove, the pressing ring includes a peripheral side surface and a third surface facing the cover plate, the peripheral side surface abuts against the side wall surface of the first groove, the third surface abuts against the bottom wall surface of the first groove, and the pressing ring is provided with a second through hole, the second through hole penetrates the pressing ring along the thickness direction of the pressing ring and is connected with 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, characterized in that: The sealing member includes a first sealing portion and a second sealing portion, wherein 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 a side of the first sealing portion away from the pole, and is arranged around the first sealing portion and clamped between the lower plastic and the pressure ring, wherein the second sealing portion and the first sealing portion enclose the first mounting groove.

3. The end cap assembly according to claim 2, characterized in that: 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 away from the cover plate, the second mounting groove is arranged around the mounting hole and is communicated 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 installation 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 second groove bottom wall and the third surface, and 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 second groove side wall and the peripheral side surface.

4. The end cap assembly according to claim 3, characterized in that: The first part is provided with an air hole, which penetrates the first part along the thickness direction of the first part, is communicated with the first installation groove, and is spaced apart from the first sealing part.

5. The end cap assembly according to claim 4, characterized in that: The lower plastic is also provided with a boss, which is arranged 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 hole and has an interference fit with the air hole.

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 disposed 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, characterized in that: The pole comprises a matching portion and a fixing portion, wherein the matching portion is provided through the assembly hole, the mounting hole and the first through hole, and the fixing portion is located on a side of the first surface away from the second surface and is fixedly connected to the matching portion and is 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 in a direction close to the hole wall surface of the assembly hole relative to the peripheral side surface of the fixing portion, 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 hole wall surface of the second through hole.

8. The end cap assembly according to claim 7, characterized in that: The end cover assembly further comprises an upper plastic, the upper plastic is penetrated through 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 comprises 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 arranged through the third through hole, and the pole further comprises a flange portion, which is connected to a side of the matching portion away from the fixing portion and is installed in the third installation groove.

9. The end cap assembly according to claim 8, characterized in that: 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 penetrates the surface of the upper plastic 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, the third groove penetrates 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: It includes the energy storage device as described in claim 11, and the energy storage device supplies power to the electrical equipment.

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