End cover assembly, energy storage device and electric equipment

Abstract

According to the end cover assembly, the energy storage device and the electric equipment, the sealing performance of the end cover assembly can be improved, and therefore the safety and reliability of the energy storage device can be improved. The end cover assembly comprises a cover plate, a pole, upper plastic, a sealing piece and a pressing ring, the cover plate comprises a first surface and a second surface, the first surface and the second surface are oppositely arranged in the thickness direction of the cover plate, the cover plate is provided with an assembly hole, and the assembly hole penetrates through the first surface and the second surface; the pole penetrates through the assembly hole, the upper plastic sleeve is arranged on the pole and connected between the pole and the cover plate, and the pressing ring is located on the side, away from the second surface, of the first surface and sleeves the pole; the sealing element comprises a first sealing part, and the first sealing part sleeves the pole and is clamped between the pole and the pressing ring.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an end cap assembly, an energy storage device, and an electrical appliance. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or storage battery, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, so do the requirements for their energy density and reliability. However, in the current manufacturing process of rechargeable batteries, weld holes are prone to appear at the welding points between the pressure ring and the terminals of the end cap assembly, resulting in poor sealing of the end cap assembly and reducing the safety and reliability of the rechargeable battery. Utility Model Content

[0003] This application provides an end cap assembly, an energy storage device, and an electrical device, which can improve the sealing performance of the end cap assembly, thereby helping to improve the safety and reliability of the energy storage device.

[0004] In a first aspect, this application provides an end cap assembly for use in an energy storage device. The end cap assembly includes a cover plate, an electrode post, an upper plastic component, a seal, and a pressure ring. The cover plate includes a first surface and a second surface, which are disposed opposite to each other along the thickness direction of the cover plate. The cover plate has an assembly hole that penetrates both the first and second surfaces. The upper plastic component passes through the assembly hole and has an mounting hole that penetrates the upper plastic component along its thickness direction and communicates with the assembly hole. The pressure ring is located on the side of the first surface opposite to the second surface. The pressure ring has a mating hole that penetrates the pressure ring along its thickness direction and communicates with the assembly hole. The electrode post includes... The fixing part and the mating part are connected. The fixing part is located on the side of the first surface away from the second surface and passes through the mating hole and is fixedly connected to the pressure ring. The mating part passes through the assembly hole and the mounting hole and is fixedly connected to the fixing part. The peripheral side surface of the mating part protrudes relative to the peripheral side surface of the fixing part. The mating part is provided with a first groove. The opening of the first groove is located on the surface of the mating part facing the fixing part, and the first groove penetrates the peripheral side surface of the mating part. The sealing element includes a first sealing part, which is sleeved on the mating part and clamped between the bottom wall surface of the first groove and the surface of the pressure ring facing the cover plate.

[0005] The sealing element further includes a second sealing part, which is connected to the side of the first sealing part away from the pole post, and is disposed around the first sealing part and sandwiched between the upper plastic and the pressure ring.

[0006] The first sealing portion includes a first surface facing away from the pressure ring, and the second sealing portion includes a second surface facing away from the pressure ring. Along the thickness direction of the end cap assembly, the second surface is located on the side of the first surface facing away from the pressure ring, and the second sealing portion abuts against the peripheral side surface of the mating portion.

[0007] The pressure ring is provided with a mounting groove, the opening of which is located on the surface of the pressure ring facing the cover plate. The mounting groove is arranged around the periphery of the mating hole and communicates with the mating hole. The first sealing part is sandwiched between the bottom wall of the mounting groove and the bottom wall of the first groove. The second sealing part is sandwiched between the bottom wall of the mounting groove and the surface of the upper plastic facing the pressure ring.

[0008] The sealing element further includes a third sealing portion, which is connected to the side of the second sealing portion away from the first sealing portion, and is disposed around the second sealing portion, and is sandwiched between the first surface and the surface of the pressure ring facing the cover plate.

[0009] The fixing part is provided with a second groove, the opening of the second groove is located on the surface of the fixing part away from the mating part, and the second groove penetrates the peripheral side surface of the fixing part; the pressure ring includes a pressure ring body and a protrusion, the pressure ring body is provided with the mating hole and the mounting groove, the protrusion is connected to the hole wall of the mating hole, and is arranged around the center of the mating hole, and is installed in the second groove.

[0010] Wherein, along the thickness direction of the end cap assembly, the surface of the protrusion facing the first surface is located on the side of the bottom wall of the mounting groove away from the first surface.

[0011] The fixing part includes a first welding surface that is away from the mating part, and the pressure ring includes a second welding surface that is away from the first surface. Along the thickness direction of the end cap assembly, the second welding surface is located on the side of the first welding surface facing the first surface.

[0012] The mounting hole wall includes a connecting surface and a first chamfered surface. The connecting surface is located between the first surface and the second surface and is spaced apart from the first surface and the second surface. The first chamfered surface is connected between the first surface and the connecting surface.

[0013] Secondly, this application also provides an energy storage device, including a housing and an end cap assembly as described in any of the preceding claims, the end cap assembly being mounted on the housing and closing the opening of the housing.

[0014] Thirdly, this application also provides an electrical device, including the energy storage device described above, wherein the energy storage device supplies power to the electrical device.

[0015] In the end cap assembly provided in this application, by providing a first sealing part between the pole post and the pressure ring, when the weld seal between the pole post and the pressure ring fails in the production process of the end cap assembly, the first sealing part can still seal the assembly gap between the pressure ring and the pole post, ensuring good sealing performance of the end cap assembly, thereby helping to improve the safety and reliability of the energy storage device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0017] Figure 1 This is a schematic diagram of the energy storage device provided in the embodiments of this application;

[0018] Figure 2 yes Figure 1 The diagram shows the structure of the end cap assembly in the energy storage device.

[0019] Figure 3 yes Figure 2 The exploded view of the end cap assembly is shown.

[0020] Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly after it has been cut along point AA.

[0021] Figure 5 yes Figure 3 The diagram shows the structure of the lower plastic part in the end cap assembly.

[0022] Figure 6 yes Figure 5 The diagram below shows the structure of the plastic after it has been cut open along the BB section.

[0023] Figure 7 yes Figure 3 The diagram shows the structure of the cover plate and explosion-proof valve in the end cap assembly.

[0024] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure of the cover plate after it is cut along point CC.

[0025] Figure 9 yes Figure 3 The exploded structural diagram of the pole post unit in the end cap assembly shown.

[0026] Figure 10 yes Figure 9 A schematic diagram of the cross-sectional structure of the upper plastic part of the pole unit shown, after being cut along DD.

[0027] Figure 11 yes Figure 9 A schematic diagram of the cross-sectional structure of the pole post unit shown, after being cut along EE.

[0028] Figure 12 yes Figure 9 A schematic diagram of the cross-sectional structure of the pressure ring in the pole unit shown, after being cut along FF.

[0029] Figure 13 yes Figure 9 The diagram shows a cross-sectional view of the seal in the pole unit after it is cut along point GG.

[0030] The names corresponding to the labels in the figure are:

[0031] Energy storage device 100, housing 110, end cap assembly 120, lower plastic 10, cover plate 20, explosion-proof valve 30, pole unit 40, first mounting surface 10a, second mounting surface 10b, explosion-proof fence 101, liquid inlet 102, through hole 103, assembly groove 104, first surface 20a, second surface 20b, explosion-proof hole 201, liquid injection hole 202, assembly hole 203, connecting surface 203a, first chamfered surface 203b, second chamfered surface 203c, upper plastic 41, pole 42. Seal 43, pressure ring 44, mounting hole 411, mating groove 412, main body 413, extension 414, flange 421, mating part 422, fixing part 423, first welding surface 423b, first groove 422a, second groove 423a, pressure ring body 44a, protrusion 44b, mating hole 441, mounting groove 442, second welding surface 44c, first sealing part 431, second sealing part 432, third sealing part 433, first surface 431a, second surface 432a. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0033] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the energy storage device 100 provided in the embodiments of this 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. The X-axis direction, Y-axis direction, and Z-axis direction are all perpendicular to each other.

[0034] 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), the opening communicating with the receiving cavity. The battery cell is received in the receiving cavity. The receiving cavity also serves to contain electrolyte, in which the battery cell is immersed. 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 prismatic battery. In some other embodiments, the energy storage device 100 may also be a cylindrical battery or other types of batteries.

[0035] Please see Figures 2 to 4 , Figure 2 yes Figure 1 The diagram shows the structure of the end cap assembly 120 in the energy storage device 100. Figure 3 yes Figure 2 The exploded structural diagram of the end cap assembly 120 shown is as follows. Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly 120 after it has been cut along line AA. "Cut along line AA" means cut along the plane containing line AA; similar descriptions in the following text can be understood in the same way.

[0036] The end cap assembly 120 includes a lower plastic 10, a cover plate 20, an explosion-proof valve 30, and two pole post 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 post units 40 are both installed on the cover plate 20. Along the length of the energy storage device 100, the two pole post units 40 are located on opposite sides of the explosion-proof valve 30.

[0037] Please refer to the following: Figure 4 , Figure 5 and Figure 6 , Figure 5 yes Figure 3 The diagram shows the structure of the lower plastic 10 in the end cap assembly 120. Figure 6 yes Figure 5 The diagram shows the structure of the lower plastic 10 after it is cut open along BB.

[0038] The lower plastic 10 includes a first mounting surface 10a and a second mounting surface 10b, which are arranged opposite to each other along the thickness direction of the lower plastic 10. The first mounting surface 10a is the surface of the lower plastic 10 facing the housing 110, and the second mounting surface 10b is the surface of the lower plastic 10 away from the housing 110. The lower plastic 10 also includes an explosion-proof barrier 101, which penetrates both the first mounting surface 10a and the second mounting surface 10b of the lower plastic 10. Specifically, the explosion-proof barrier 101 is located in the middle of the lower plastic 10.

[0039] In this embodiment, the lower plastic 10 is further provided with a liquid inlet 102, two through holes 103, and two mounting grooves 104. The liquid inlet 102 and the two through holes 103 both penetrate the first mounting surface 10a and the second mounting surface 10b of the lower plastic 10 and are spaced apart from each other. Specifically, along the length direction of the energy storage device 100 (X-axis direction in the figure), the liquid inlet 102 is located in the middle of the lower plastic 10 and on one side of the explosion-proof fence 101, and is spaced apart from the explosion-proof fence 101.

[0040] Along the length of the energy storage device 100 (X-axis direction in the figure), both through holes 103 are located at the edge of the lower plastic 10, and are spaced apart from the liquid inlet 102 and the explosion-proof fence 101. Specifically, one through hole 103 is located on the side of the liquid inlet 102 away from the explosion-proof fence 101, and the other through hole 103 is located on the side of the explosion-proof fence 101 away from the liquid inlet 102.

[0041] The openings of both mounting slots 104 are located on the first mounting surface 10a of the lower plastic 10. Both mounting slots 104 are recessed from the first mounting surface 10a toward the second mounting surface 10b. The two mounting slots 104 are spaced apart along the length of the lower plastic 10 (X-axis direction in the figure). Each mounting slot 104 is arranged around the periphery of a through hole 103.

[0042] Please refer to the following: Figure 4 , Figure 7 and Figure 8 , Figure 7 yes Figure 3 The diagram shows the structure of the cover plate 20 and the explosion-proof valve 30 in the end cap assembly 120. Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the cover plate 20 after it is cut along CC.

[0043] The cover plate 20 is mounted on the second mounting surface 10b of the lower plastic 10. In this embodiment, the cover plate 20 includes a first surface 20a and a second surface 20b, which are arranged opposite to each other along the thickness direction of the cover plate 20 (Z-axis direction in the figure). Specifically, the first surface 20a is the side of the cover plate 20 facing the lower plastic 10, and the second surface 20b is the side of the cover plate 20 facing away from the lower plastic 10.

[0044] 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 20a and the second surface 20b 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 connect to the interior of the energy storage device 100 through the explosion-proof grille 101. Along the length direction of the cover plate 20 (the X-axis direction in the figure), the liquid injection hole 202 is located on one side of the explosion-proof hole 201. The liquid injection hole 202 communicates with the liquid inlet hole 102 of the lower plastic 10. Electrolyte can be injected into the housing 110 (e.g., through the liquid injection hole 202 of the cover plate 20 and the liquid inlet hole 102 of the lower plastic 10) in sequence. Figure 1 The cavity shown is used to fill the electrolyte of the energy storage device 100.

[0045] Along the length of the energy storage device 100 (X-axis direction in the diagram), two mounting holes 203 are located on the edge of the cover plate 20, and are respectively located on opposite sides of the explosion-proof hole 201 and the liquid injection hole 202. Specifically, one mounting hole 203 is located on the side of the liquid injection hole 202 away from the explosion-proof hole 201, and the other mounting hole 203 is located on the side of the explosion-proof hole 201 away from the liquid injection hole 202. Each mounting hole 203 communicates with a through hole 103 in the lower plastic 10 to facilitate the installation of an electrode post unit 40.

[0046] Furthermore, each assembly hole 203 has a hole wall surface including a connecting surface 203a, a first chamfer surface 203b, and a second chamfer surface 203c. The connecting surface 203a is located between the first surface 20a and the second surface 20b, and is spaced apart from both surfaces. The first chamfer surface 203b connects the first surface 20a and the connecting surface 203a. Exemplarily, the first chamfer surface 203b can be a beveled chamfer surface. In some other embodiments, the first chamfer surface 203b can also be a rounded chamfer surface; the embodiments of this application do not strictly limit this.

[0047] In this embodiment, the second chamfered surface 203c connects the second surface 20b and the connecting surface 203a. Exemplarily, the second chamfered surface 203c can be a beveled chamfered surface. In some other embodiments, the second chamfered surface 203c can also be a rounded chamfered surface; the embodiments of this application do not strictly limit this.

[0048] Please continue reading. Figure 4 and Figure 7The 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. For example, the explosion-proof valve 30 can be fixedly connected to the hole wall of the explosion-proof hole 201 by welding. It is understood that since the explosion-proof hole 201 connects the interior and exterior of the energy storage device 100, when the internal gas pressure of the energy storage device 100 is too high, the explosion-proof valve 30 will rupture under the pressure. The gas inside the energy storage device 100 can then be discharged to the exterior of the energy storage device 100 in a timely manner through the explosion-proof fence 101 of the lower plastic 10 and the explosion-proof hole 201, preventing the energy storage device 100 from exploding and improving the reliability of the energy storage device 100.

[0049] In this embodiment, the two terminal units 40 can have the same or similar structures. One terminal unit is a positive terminal unit and is electrically connected to the positive tab of the battery cell. The other terminal unit 40 is a negative terminal unit and is electrically connected to the negative tab of the battery cell. The following will describe the structure of one terminal unit 40 as an example.

[0050] Please refer to the following: Figure 4 , Figure 9 and Figure 10 , Figure 9 yes Figure 3 An exploded view of the pole post unit 40 in the end cap assembly 120 shown. Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the upper plastic 41 of the pole unit 40 after it is cut along the DD direction.

[0051] The electrode unit 40 includes an upper plastic 41, an electrode 42, a seal 43, and a pressure ring 44, all of which are fitted onto the electrode 42. The upper plastic 41 connects the cover plate 20 and the electrode 42 to prevent short circuits in the end cap assembly 120 caused by direct contact between the electrode 42 and the cover plate 20. Furthermore, the cover plate 20 has a second chamfered surface 203c on the wall of its mounting hole 203, which guides the assembly of the upper plastic 41, facilitating the assembly of the upper plastic 41 with the cover plate 20.

[0052] Specifically, the upper plastic 41 is provided with a mounting hole 411 and a mating groove 412. The mounting hole 411 penetrates the upper plastic 41 along its thickness direction and is coaxial with and communicates with an assembly hole 203 of the cover plate 20. The opening of the mating groove 412 is located on the surface of the upper plastic 41 away from the cover plate 20. The mating groove 412 is recessed from the surface of the upper plastic 41 away from the cover plate 20 toward the cover plate 20, penetrates the wall of the mounting hole 411, and communicates with the mounting hole 411.

[0053] The upper plastic 41 also includes a main body 413 and an extension 414, with the extension 414 fixedly connected to the main body 413. Specifically, the main body 413 has a mating groove 412 and a mounting hole 411. The opening of the mating groove 412 is located on the surface of the main body 413 facing away from the cover plate 20. The extension 414 is fixedly connected to the side of the main body 413 facing the cover plate 20. The extension 414 is arranged around the periphery of the mounting hole 411. Specifically, the extension 414 is mounted in an assembly hole 203 of the cover plate 20.

[0054] Please refer to the following: Figure 9 and Figure 11 , Figure 11 yes Figure 9 A schematic diagram of the cross-sectional structure of pole post 42 in pole post unit 40 after being cut along EE.

[0055] The electrode post 42 passes through the mounting hole 411 of the upper plastic 41, an assembly hole 203 of the cover plate 20, and a through hole 103 of the lower plastic 10. Exemplarily, the electrode post 42 is a negative electrode post. In some other embodiments, the electrode post 42 may also be a positive electrode post; the embodiments of this application do not strictly limit this.

[0056] In this embodiment, the pole post 42 includes a flange portion 421, a mating portion 422, and a fixing portion 423. Both the mating portion 422 and the fixing portion 423 are located on one side of the flange portion 421 in the thickness direction. Specifically, the flange portion 421 of the pole post 42 is located within the mating groove 412 of the upper plastic 41. In other words, it is located between the flange portion 421 of the upper plastic 41 and the cover plate 20. The mating portion 422 is fixedly connected to the flange portion 421 and passes through the mounting hole 411 of the upper plastic 41, an assembly hole 203 of the cover plate 20, and a through hole 103 of the lower plastic 10. In other words, the extension portion 414 of the upper plastic 41 connects between the peripheral side surface of the mating portion 422 of the pole post 42 and the hole wall surface of the assembly hole 203. The peripheral side surface of the flange portion 421 protrudes relative to the peripheral side surface of the mating portion 422. The fixing portion 423 is fixedly connected to the side of the mating portion 422 opposite to the flange portion 421. In this embodiment, the peripheral side of the mating part 422 protrudes relative to the peripheral side of the fixing part 423. The fixing part 423 is used for welding and fixing the pressure ring 44. The fixing part 423 includes a first welding surface 423b that faces away from the first surface 20a of the cover plate 20. The first welding surface 423b can be used for subsequent laser welding with the pressure ring 44.

[0057] Furthermore, the pole post 42 is also provided with a first groove 422a and a second groove 423a. Specifically, the mating part 422 is provided with a first groove 422a. The opening of the first groove 422a is located on the surface of the mating part 422 facing the fixing part 423. The first groove 422a is recessed from the surface of the mating part 422 facing the fixing part 423 in a direction away from the fixing part 423, and penetrates the peripheral side surface of the mating part 422.

[0058] The fixing part 423 is provided with a second groove 423a, the opening of which is located on the surface of the fixing part 423 away from the mating part 422. The second groove 423a is recessed from the surface of the fixing part 423 away from the mating part 422 toward the mating part 422 and penetrates the peripheral side surface of the fixing part 423.

[0059] Please refer to the following: Figure 4 , Figure 9 and Figure 12 , Figure 12 yes Figure 9 The diagram shows a cross-sectional view of the pressure ring 44 in the pole unit 40 after it is cut along FF.

[0060] In this embodiment, the pressure ring 44 is located on the side of the first surface 20a of the cover plate 20 that faces away from the second surface 20b, and is installed in an assembly groove 104 of the lower plastic 10. It is also sleeved on the fixing part 423 of the pole post 42 and welded to the fixing part 423 of the pole post 42. It can be understood that by installing the pressure ring 44 in the assembly groove 104 of the lower plastic 10, the short circuit problem caused by direct contact between the pressure ring 44 and the cover plate 20 can be avoided, thereby helping to improve the safety performance of the end cap assembly 120.

[0061] Specifically, the pressure ring 44 includes a pressure ring body 44a and a protrusion 44b, with the protrusion 44b fixedly connected to the pressure ring body. The pressure ring body 44a is sleeved on the electrode post 42. The pressure ring body 44a has a mating hole 441 and a mounting groove 442. The mating hole 441 penetrates the pressure ring body 44a along its thickness direction. The mating hole 441 is used to mount the fixing part 423 of the electrode post 42. The opening of the mounting groove 442 is located on the surface of the pressure ring body 44a facing the cover plate 20. The mounting groove 442 is arranged around the periphery of the mating hole 441 and communicates with it. Specifically, the mounting groove 442 is recessed from the surface of the pressure ring body 44a facing the cover plate 20 in a direction away from the cover plate 20, and penetrates the hole wall of the mating hole 441 to communicate with it. The protrusion 44b is fixedly connected to the hole wall of the mating hole 441 and is arranged around the center of the mating hole 441. Along the thickness direction of the end cap assembly 120, the surface of the protrusion 44b facing the first surface 20a of the cover plate 20 is located on the side of the bottom wall of the mounting groove 442 away from the first surface 20a.

[0062] When the pressure ring 44 is fitted onto the pole post 42, the pressure ring body 44a is fitted onto the fixing portion 423 of the pole post 42. In other words, the fixing portion 423 of the pole post 42 passes through the mating hole 441 of the pressure ring body 44a. The mounting groove 442 of the pressure ring body 44a is provided around the periphery of the mating portion 422 of the pole post 42. The protrusion 44b is located within the second groove 423a of the fixing portion 423 of the pole post 42.

[0063] It should be understood that when the pressure ring 44 and the pole post 42 are laser welded, the laser can easily enter the assembly gap between the pole post 42 and the pressure ring 44. In this embodiment, by providing a protrusion 44b on the pressure ring 44 and a second groove 423a on the pole post 42, and placing the protrusion 44b within the second groove 423a of the pole post 42, the protrusion 44b of the pressure ring 44 and the second groove 423a of the pole post 42 cooperate with each other, which can increase the area of ​​the mating surfaces of the pressure ring 44 and the pole post 42, and improve the assembly reliability between the pole post 42 and the pressure ring 44. At the same time, this arrangement can also extend the laser leakage path in the assembly gap between the pole post 42 and the pressure ring 44, avoiding laser burns to the seal 43 clamped between the pole post 42 and the pressure ring 44, thereby avoiding the welding explosion problem caused by the hot melting of the seal 43, which helps to improve the welding yield of the pressure ring 44 and the pole post 42 and reduce the scrap rate of the energy storage device 100 process.

[0064] Furthermore, by positioning the surface of the protrusion 44b facing the first surface 20a of the cover plate 20 on the side of the bottom wall of the mounting groove 442 away from the first surface 20a, the surface of the pressure ring facing the cover plate 20 can be arranged in a stepped manner. This can further extend the laser leakage path in the assembly gap between the pole post 42 and the pressure ring 44, avoid laser burns on the seal 43 clamped between the pole post 42 and the pressure ring 44, and also avoid welding explosions caused by heat melting burns on the seal 43. This improves the welding yield of the pressure ring 44 and the pole post 42, and also helps to reduce the scrap rate of the energy storage device 100 process.

[0065] In this embodiment, the pressure ring 44 further includes a second welding surface 44c facing away from the first surface 20a of the cover plate 20. Along the thickness direction of the end cap assembly 120 (the Z-axis direction in the figure), the second welding surface 44c is located on the side of the first welding surface 423b of the pole post 42 facing the first surface 20a.

[0066] It should be understood that the first welding surface 423b of the terminal post 42 is usually also welded to the adapter plate to enable the terminal post 42 to be electrically connected to the cell of the energy storage device 100. By positioning the second welding surface 44c on the side of the first welding surface 423b facing the first surface 20a, the second welding surface 44c of the pressure ring 44 can be prevented from being higher than the first welding surface 423b. This avoids interference between the pressure ring 44 and the welding between the adapter plate and the terminal post 42, thereby ensuring that the terminal post 42 and the adapter plate can be successfully welded.

[0067] Please refer to the following: Figure 4 , Figure 9 and Figure 13 , Figure 13 yes Figure 9 A schematic diagram of the cross-sectional structure of the seal 43 in the pole unit 40 after being cut along GG.

[0068] The seal 43 is fitted onto the pole post 42 and clamped between the pole post 42 and the pressure ring 44, as well as between the upper plastic 41 and the pressure ring 44, and between the cover plate 20 and the pressure ring 44. This ensures good assembly stability and sealing between the pressure ring 44 and the pole post 42, between the pressure ring 44 and the upper plastic 41, and between the pressure ring 44 and the cover plate 20. Furthermore, during the assembly of the end cap assembly 120, the seal 43 exhibits significant internal rebound force when compressed. By providing a first chamfered surface 203b on the cover plate 20, it is possible to prevent the cover plate 20 from cutting the seal 43, thereby avoiding damage to the seal 43 during assembly.

[0069] In this embodiment, the sealing element 43 includes a first sealing part 431, a second sealing part 432, and a third sealing part 433. The first sealing part 431 is sleeved on the pole post 42 and clamped between the mating part 422 of the pole post 42 and the pressure ring body 44a of the pressure ring 44. Specifically, the first sealing part 431 is clamped between the bottom wall of the first groove 422a and the surface of the pressure ring 44 facing the cover plate 20, and between the bottom wall of the mounting groove 442 and the bottom wall of the first groove 422a of the pole post 42. With this arrangement, on the one hand, the first sealing part 431 seals the gap between the bottom wall of the mounting groove 442 and the bottom wall of the first groove 422a, thereby achieving a seal between the pressure ring 44 and the pole post 42. On the other hand, it also ensures that the first sealing part 431 is reliably clamped between the pole post 42 and the pressure ring 44, guaranteeing good assembly reliability between the sealing element 43 and the pole post 42 and the pressure ring 44. In addition, the first sealing part 431 includes a first surface 431a that is opposite to the pressure ring body 44a of the pressure ring 44.

[0070] The second sealing part 432 is connected to the side of the first sealing part 431 opposite to the fixing part 423 of the pole post 42, and is disposed around the periphery of the first sealing part 431, and is sandwiched between the extension 414 of the upper plastic 41 and the pressure ring body 44a of the pressure ring 44. Specifically, the second sealing part 432 is sandwiched between the surface of the extension 414 of the upper plastic 41 facing the pressure ring 44 and the bottom wall of the mounting groove 442. With this arrangement, the second sealing part 432 seals the gap between the surface of the extension 414 facing the pressure ring 44 and the bottom wall of the mounting groove 442, so as to achieve a seal between the pressure ring 44 and the upper plastic 41.

[0071] Furthermore, the second sealing portion 432 includes a second surface 432a that faces away from the pressure ring body 44a of the pressure ring 44. Along the thickness direction of the end cap assembly 120 (Z-axis direction in the figure), the second surface 432a is located on the side of the first surface 431a that faces away from the pressure ring body 44a of the pressure ring 44. The second sealing portion 432 abuts against the peripheral side surface of the mating portion 422. In this configuration, the second surface 432a of the second sealing portion 432 is higher than the first surface 431a of the first sealing portion 431, thus increasing the contact area between the second sealing portion 432 and the peripheral side surface of the mating portion 422 of the pole post 42. After the end cap assembly 120 is assembled, the surface of the second sealing portion 432 facing the mating portion 422 is tightly fitted with the peripheral side surface of the mating portion 422, thereby further sealing the exhaust passage within the end cap assembly 120 and thus helping to improve the airtight reliability of the end cap assembly 120.

[0072] The third sealing part 433 is connected to the side of the second sealing part 432 opposite to the first sealing part 431, and is disposed around the periphery of the second sealing part 432, and is sandwiched between the cover plate 20 and the pressure ring 44. Specifically, the third sealing part 433 is sandwiched between the first surface 20a and the surface of the pressure ring body 44a facing the cover plate 20. With this arrangement, the third sealing part 433 seals the gap between the first surface 20a and the surface of the pressure ring body 44a facing the cover plate 20, so as to achieve a seal between the pressure ring 44 and the cover plate 20. Furthermore, by ensuring that the surfaces of the first sealing part 431 facing the pressure ring body 44a and the second sealing part 432 facing the pressure ring body 44a are both in contact with the bottom wall of the mounting groove 442, and by clamping the third sealing part 433 between the surface of the pressure ring body 44a facing the cover plate 20 and the first surface 20a, the surface of the sealing element 43 facing the pressure ring 44 can be distributed in a stepped manner. This allows for a larger suction nozzle area for the feeding equipment during the assembly of the sealing element 43, thereby helping to reduce the risk of the sealing element 43 falling off during the feeding process, ensuring that the end cap assembly 120 can be successfully assembled, and helping to reduce the scrap rate of the energy storage device 100 process.

[0073] It should be understood that during the production process of the end cap assembly 120, weld holes may occur in the welding area between the pole post 42 and the pressure ring 44, leading to seal failure between the pole post 42 and the pressure ring 44. In the end cap assembly 120 provided in this application, by clamping the first sealing part 431 of the sealing member 43 between the mating part 422 of the pole post 42 and the pressure ring body 44a of the pressure ring 44, the first sealing part 431 can seal the assembly gap between the pressure ring body 44a and the mating part 422 of the pole post 42. Even if the seal in the welding area between the pole post 42 and the pressure ring 44 fails, the sealing performance of the end cap assembly 120 can be guaranteed, thereby helping to improve the safety and reliability of the energy storage device 100.

[0074] Based on this, by providing a second sealing part 432 between the extension 414 of the upper plastic 41 and the pressure ring body 44a, and a third sealing part 433 between the pressure ring 44 and the cover plate 20, the assembly gap between the extension 414 of the upper plastic 41 and the pressure ring body 44a, as well as the assembly gap between the pressure ring body 44a and the cover plate 20, can be sealed. This allows the sealing element 43 to form multiple seals in the end cap assembly 120, further ensuring the airtight reliability of the end cap assembly 120 in the event of failure of the welded seal between the pole post 42 and the pressure ring 44, thereby further improving the sealing performance of the end cap assembly 120.

[0075] This application also provides an electrical device, which includes the aforementioned energy storage device 100, and the energy storage device 100 supplies power to the electrical device. The electrical device can be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

[0076] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the 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, an electrode post, an upper plastic, a seal, and a pressure ring. 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 that penetrates the first surface and the second surface. The upper plastic is inserted through the assembly hole, and the upper plastic is provided with a mounting hole. The mounting hole penetrates the upper plastic along the thickness direction and communicates with the assembly hole. The pressure ring is located on the side of the first surface opposite to the second surface. The pressure ring is provided with a mating hole that penetrates the pressure ring along the thickness direction and communicates with the assembly hole. The pole post includes a fixed part and a mating part connected to each other. The fixed part is located on the side of the first surface away from the second surface and passes through the mating hole and is fixedly connected to the pressure ring. The mating part passes through the assembly hole and the mounting hole and is fixedly connected to the fixed part. The peripheral side of the mating part protrudes relative to the peripheral side of the fixed part. The mating part is provided with a first groove. The opening of the first groove is located on the surface of the mating part facing the fixed part, and the first groove penetrates the peripheral side of the mating part. The sealing element includes a first sealing part, which is sleeved on the mating part and clamped between the bottom wall of the first groove and the surface of the pressure ring facing the cover plate.

2. The end cap assembly according to claim 1, characterized in that, The sealing element further includes a second sealing portion, which is connected to the side of the first sealing portion away from the pole post, and is disposed around the first sealing portion and sandwiched between the upper plastic and the pressure ring.

3. The end cap assembly according to claim 2, characterized in that, The first sealing portion includes a first surface facing away from the pressure ring, and the second sealing portion includes a second surface facing away from the pressure ring. Along the thickness direction of the end cap assembly, the second surface is located on the side of the first surface facing away from the pressure ring, wherein the second sealing portion abuts against the peripheral side surface of the mating portion.

4. The end cap assembly according to claim 2 or 3, characterized in that, The pressure ring is provided with a mounting groove, the opening of the mounting groove is located on the surface of the pressure ring facing the cover plate, the mounting groove is arranged around the periphery of the mating hole and communicates with the mating hole; The first sealing part is sandwiched between the bottom wall of the mounting groove and the bottom wall of the first recess; The second sealing part is clamped between the bottom wall of the mounting groove and the surface of the upper plastic facing the pressure ring.

5. The end cap assembly according to claim 4, characterized in that, The seal further includes a third sealing portion, which is connected to the side of the second sealing portion away from the first sealing portion, and is disposed around the second sealing portion and sandwiched between the first surface and the surface of the pressure ring facing the cover plate.

6. The end cap assembly according to claim 4, characterized in that, The fixing part is provided with a second groove, the opening of the second groove is located on the surface of the fixing part opposite to the mating part, and the second groove penetrates the peripheral side surface of the fixing part; The pressure ring includes a pressure ring body and a protrusion. The pressure ring body is provided with the mating hole and the mounting groove. The protrusion is connected to the hole wall of the mating hole and is arranged around the center of the mating hole, and is installed in the second groove.

7. The end cap assembly according to claim 6, characterized in that, Along the thickness direction of the end cap assembly, the surface of the protrusion facing the first surface is located on the side of the bottom wall of the mounting groove away from the first surface.

8. The end cap assembly according to claim 1, characterized in that, The fixing part includes a first welding surface away from the mating part, and the pressure ring includes a second welding surface away from the first surface. Along the thickness direction of the end cap assembly, the second welding surface is located on the side of the first welding surface facing the first surface.

9. The end cap assembly according to claim 1, characterized in that, The wall surface of the assembly hole includes a connecting surface and a first chamfered surface. The connecting surface is located between the first surface and the second surface and is spaced apart from the first surface and the second surface. The first chamfered surface is connected between the first surface and the connecting surface.

10. An energy storage device, characterized in that, It includes a housing and an end cap assembly as described in any one of claims 1 to 9, the end cap assembly being mounted on the housing and closing an opening in the housing.

11. An electrical appliance, characterized in that, It includes the energy storage device as described in claim 10, wherein the energy storage device supplies power to the electrical equipment.

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