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 assembly stability of the end cover assembly is improved, and the use reliability of the energy storage device is improved. The end cover assembly comprises an end cover, an upper insulating part, a pressing block and a pole, and the end cover is provided with a first mounting hole; the upper insulating part is mounted on one side of the end cover, the upper insulating part is provided with a second mounting hole, and the second mounting hole is communicated with the first mounting hole; the pressing block comprises a first pressing block part, a second pressing block part and a connecting part, the first pressing block part is mounted on the upper insulating part and is provided with a third mounting hole, the third mounting hole is communicated with the second mounting hole, the second pressing block part and the first surface are oppositely arranged at an interval and are provided with a first through hole, and the connecting part is connected between the first pressing block part and the second pressing block part; a second through hole is formed in the first mounting hole and is communicated with the third mounting hole and the first through hole; and the pole penetrates through the first mounting hole, the second mounting hole and the third mounting hole and is fixed with the first pressing block part.

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] With the increasingly widespread application of energy storage devices, people have higher requirements for their energy density, performance, reliability, and cost. In the assembly process of existing energy storage devices, the welding of the insulating material to the pressure block can cause the upper insulating component to melt, affecting the stable assembly of the energy storage device and reducing its reliability. Utility Model Content

[0003] This application provides an end cap assembly, an energy storage device, and an electrical device, which improves the assembly stability of the end cap assembly and enhances the reliability and competitiveness of the energy storage device.

[0004] This application provides an end cap assembly, including an end cap, an upper insulating member, a pressure block, and an electrode post;

[0005] The end cap is provided with a first mounting hole, which penetrates the end cap along the thickness direction.

[0006] Along the thickness direction of the end cap, the upper insulating member is installed on one side of the end cap. The upper insulating member includes a first surface and a second surface. The first surface is the surface of the upper insulating member that faces away from the end cap. The second surface is disposed opposite to the first surface. The upper insulating member is provided with a second mounting hole. The second mounting hole penetrates the first surface and the second surface and communicates with the first mounting hole.

[0007] The pressure block includes a first pressure block portion, a second pressure block portion, and a connecting portion. The first pressure block portion is mounted on the upper insulating member and has a third mounting hole. The third mounting hole penetrates the first pressure block portion along the thickness direction of the pressure block and communicates with the second mounting hole. The second pressure block portion is located on the side of the first pressure block portion away from the upper insulating member and is used for welding with the plate. Along the thickness direction of the end cap assembly, the second pressure block portion is spaced apart from and opposite to the first surface. The second pressure block portion has a first through hole that penetrates the second pressure block portion along the thickness direction of the pressure block. The connecting portion is fixedly connected between the first pressure block portion and the second pressure block portion. The connecting portion has a second through hole that penetrates the connecting portion along the thickness direction of the pressure block and communicates with the third mounting hole and the first through hole.

[0008] The pole is inserted through the first mounting hole, the second mounting hole and the third mounting hole, and is fixedly connected to the first pressure block.

[0009] Wherein, along the thickness direction of the end cap assembly, the distance between the second pressing block and the first surface is L, where L≥0.2mm.

[0010] The end cap assembly further includes a bar sheet located on the side of the first pressing block portion away from the end cap. The bar sheet includes a third surface and a fourth surface. The third surface is the surface of the bar sheet facing the first pressing block portion, and the fourth surface is disposed opposite to the third surface. The bar sheet has a groove, and the opening of the groove is located on the fourth surface.

[0011] The second pressing block extends into the groove and is fixedly connected to the plate.

[0012] The groove includes a first bottom wall and a first side wall. The first bottom wall is disposed opposite to the opening of the groove, and the first side wall surrounds the first bottom wall and connects the first bottom wall and the fourth surface.

[0013] The plate is provided with a welding part, which is located on the bottom wall of the first groove and spaced apart from the side wall of the first groove. The welding part passes through the first through hole and the second through hole and is fixedly connected to the pole post.

[0014] The wall surfaces of the first through hole and the second through hole are both arranged around the wall surface of the third mounting hole, and are both located on the side of the wall surface of the third mounting hole away from the third mounting hole, and are spaced apart from the wall surface of the third mounting hole.

[0015] The first through hole includes a first hole portion and a second hole portion. The second hole portion is located on the side of the first hole portion away from the first pressure block portion and is connected to the first hole portion. The cross-sectional area of ​​the second hole portion gradually increases along the direction from the first hole portion to the second hole portion.

[0016] The upper insulating component is further provided with a mounting groove, the opening of which is located on the first surface. The mounting groove surrounds the second mounting hole and communicates with it. The mounting groove includes a second bottom wall surface, which is disposed opposite to the opening of the mounting groove.

[0017] The first pressing block is installed in the mounting groove.

[0018] The mounting groove further includes a second groove sidewall, which surrounds the second groove bottom wall and connects the second groove bottom wall and the first surface.

[0019] The second pressing block includes a first peripheral side surface, which surrounds the second groove side wall and is located on the side of the second groove side wall opposite to the mounting groove, and is spaced apart from the second groove side wall. The first peripheral side surface includes a first peripheral face and a second peripheral face, which is located on the side of the first peripheral face opposite to the first pressing block and is connected to the first peripheral face. The second peripheral face is a chamfered surface.

[0020] The upper insulating member further includes a second peripheral side, which is connected between the first surface and the second surface;

[0021] The first circumferential side is arranged around the second circumferential side and is located on the side of the second circumferential side that is away from the mounting groove, and is spaced apart from the second circumferential side.

[0022] The first pressing block portion includes a fifth surface, which is the surface of the first pressing block portion that is away from the end cap;

[0023] The pole post includes a sixth surface, which faces the same direction as the fifth surface and protrudes relative to the fifth surface.

[0024] The pole post further includes a seventh surface, which is disposed opposite to the sixth surface along the thickness direction of the end cap assembly, and the area of ​​the sixth surface is smaller than the area of ​​the seventh surface.

[0025] This application also provides an energy storage device, which includes a housing, a battery cell assembly, and the aforementioned end cap assembly. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The battery cell assembly is housed in the receiving cavity. The end cap assembly is installed on the housing, closes the opening, and is electrically connected to the battery cell assembly.

[0026] This application also provides an electrical device, including the energy storage device described above, which is used to supply power to the electrical device.

[0027] This application, by setting a second pressing block and spacing it apart from the upper insulating component, prevents the welding heat from being directly transferred from the second pressing block to the upper insulating component during welding of the bar sheet and the second pressing block. This avoids the upper insulating component from melting due to welding heat, improves the structural stability of the upper insulating component, and ensures the assembly stability of the end cover, pressing block, and pole in the thickness direction of the end cover assembly. This ensures the compactness of the end cover assembly structure and is beneficial to improving the assembly stability of the energy storage device. Attached Figure Description

[0028] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0029] Figure 1 This is a schematic diagram of the energy storage device provided in this application;

[0030] Figure 2 yes Figure 1 The diagram shows the structure of the end cap assembly in the energy storage device.

[0031] Figure 3 yes Figure 2 The exploded view of the end cap assembly is shown.

[0032] 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.

[0033] Figure 5 yes Figure 4 An enlarged schematic diagram of region a in the end cap assembly shown;

[0034] Figure 6 yes Figure 4 An enlarged schematic diagram of region b in the end cap assembly shown;

[0035] Figure 7 yes Figure 2 A schematic diagram of the cross-sectional structure of the end cap assembly shown, cut along point AA at another angle.

[0036] Figure 8 yes Figure 3 The diagram shows the structure of the pressure block in the end cap assembly.

[0037] Figure 9 yes Figure 8 The diagram shows the structure of the pressure block at another angle;

[0038] Figure 10 yes Figure 3 The diagram shows the structure of the end cap assembly with the plate at another angle.

[0039] Reference numerals: Energy storage device 1000, housing 2000, end cap assembly 3000, opening 2001, end cap 100, explosion-proof valve 200, protective plate 300, lower insulating component 400, pin 510, upper insulating component 700, pressure block 600, pole post 520, sealing ring 800, bar plate 900, explosion-proof hole 110, first mounting hole 120, vent hole 410, fourth mounting hole 420, fifth mounting hole 511, first surface 701, second surface 702, second peripheral side surface 703, second mounting hole 710, mounting groove 720, second groove bottom wall 721, second groove side wall 722, protrusion 730, third through hole 731, first pressure block part 610, second pressure block part 62 0. Connecting part 630, fifth surface 611, eighth surface 612, third peripheral side 613, third mounting hole 614, ninth surface 621, tenth surface 622, first peripheral side 623, first peripheral face 623a, second peripheral face 623b, first through hole 624, first hole portion 624a, second hole portion 624b, fourth peripheral side 631, second through hole 632, sixth surface 521, seventh surface 522, fifth peripheral side 523, third surface 901, fourth surface 902, groove 910, first groove bottom wall 911, first groove side wall 912, welding part 920, welding surface 921, first welding position 1, third welding position 3, second welding position 2. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Please see Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of the energy storage device 1000 provided in this application. Figure 2 yes Figure 1 The diagram shows the structure of the end cap assembly 3000 in the energy storage device 1000.

[0042] This application provides an energy storage device 1000, which may include, but is not limited to, single-cell batteries, battery modules, battery packs, and battery systems. The actual application of the energy storage device provided in this application may be, but is not limited to, the products listed, or other application forms. This application does not strictly limit the application form of the energy storage device 1000. This application uses a square battery as an example for illustration.

[0043] The energy storage device 1000 includes a housing 2000, a battery cell assembly (not shown), and an end cap assembly 3000. The housing 2000 has a receiving cavity (not shown) and an opening 2001. The receiving cavity is located inside the housing 2000 and contains an electrolyte. The opening 2001 is located on the top side of the receiving cavity and communicates with it. The housing 2000 may be made of aluminum; for example, the housing 2000 may be an aluminum shell. The battery cell assembly is housed in the receiving cavity. The battery cell assembly can be immersed in the electrolyte. The end cap assembly 3000 is mounted on the housing 2000, closes the opening 2001, and is electrically connected to the battery cell assembly.

[0044] Please see Figures 3 to 6 , Figure 3 yes Figure 2 The diagram shows an exploded view of the end cap assembly 3000. Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly 3000 after it has been cut along point AA. Figure 5 yes Figure 4 An enlarged schematic diagram of region a in the end cap assembly 3000 shown. Figure 6 yes Figure 4 An enlarged schematic diagram of region b in the end cap assembly 3000 shown.

[0045] In this embodiment, the end cap assembly 3000 includes an end cap 100, a lower insulator 400, an explosion-proof valve 200, a protective plate 300, a pin 510, an upper insulator 700, a pressure block 600, a pole post 520, a sealing ring 800, and a retainer 900. Along the thickness direction of the end cap 100, the lower insulator 400 is mounted on one side of the end cap 100. The explosion-proof valve 200 and the protective plate 300 are both mounted on the end cap 100. The pin 510 is located on the side of the lower insulator 400 opposite to the end cap 100 and is electrically connected to the electrode tab of the cell assembly. There are two pins 510. One pin 510 is used as a positive pin, and the other pin 510 is used as a negative pin. Along the thickness direction of the end cap 100, the upper insulator 700 is mounted on the other side of the end cap 100. That is, the upper insulator 700 is mounted on the side of the end cap 100 away from the lower insulator 400. There are two upper insulating components 700. One upper insulating component 700 serves as the positive electrode insulating component, and the other upper insulating component 700 serves as the negative electrode insulating component. A pressure block 600 is located on the side of the upper insulating component 700 opposite to the end cover 100. There are two pressure blocks 600. One pressure block 600 serves as the positive electrode pressure block and is located on the side of the positive electrode insulating component away from the end cover 100. The other pressure block 600 serves as the negative electrode pressure block and is located on the side of the negative electrode insulating component away from the end cover 100.

[0046] Along the thickness direction of the end cap assembly 3000, the pole piece 520 passes through the pin 510, the lower insulator 400, the end cap 100, the upper insulator 700, and the pressure block 600, and connects to the pin 510 and the pressure block 600. There are two pole pieces 520. Along the length direction of the end cap assembly 3000, the two pole pieces 520 are arranged at intervals. One pole piece 520 serves as the positive pole piece and connects to the positive pin and the positive pressure block. The other pole piece 520 serves as the negative pole piece and connects to the negative pin and the negative pressure block. A sealing ring 800 is fitted onto the upper insulator 700 and clamped between the end cap 100 and the pole piece 520. There are two sealing rings 800, each fitted onto one pole piece 520 and clamped between the end cap 100 and one pole piece 520. One sealing ring 800 serves as the positive electrode sealing ring, fitted onto the positive electrode post and clamped between the end cap 100 and the positive electrode post. Another sealing ring 800 serves as the negative electrode sealing ring, fitted onto the negative electrode post and clamped between the end cap 100 and the negative electrode post. A switch 900 is located on the side of the pressure block 600 away from the upper insulator 700, and is fixedly connected to the electrode post 520 and the pressure block 600, and is used for connection to another energy storage device 1000. There are two switches 900, each fixedly connected to one electrode post 520 and one pressure block 600. One switch 900 serves as the positive electrode switch and is fixedly connected to the positive electrode post and the positive pressure block. The other switch 900 serves as the negative electrode switch and is fixedly connected to the negative electrode post and the negative pressure block.

[0047] Please continue reading. Figure 3 In this embodiment, the end cap 100 can be a smooth aluminum sheet made of aluminum. The end cap 100 has an explosion-proof hole 110 and a first mounting hole 120. Both the explosion-proof hole 110 and the first mounting hole 120 penetrate the end cap 100 along its thickness direction. Along the length direction of the end cap 100, the explosion-proof hole 110 is located in the middle of the end cap 100. The first mounting hole 120 is spaced apart from the explosion-proof hole 110 to allow the electrode post 520 to pass through. There are two first mounting holes 120. Along the length direction of the end cap 100, the two first mounting holes 120 are located on opposite sides of the explosion-proof hole 110 and are spaced apart from it. One first mounting hole 120 allows the positive electrode post to pass through. The other first mounting hole 120 allows the negative electrode post to pass through.

[0048] The lower insulating member 400 is provided with a vent 410 and a fourth mounting hole 420. Both the vent 410 and the fourth mounting hole 420 penetrate the lower insulating member 400 along its thickness direction. Along the length direction of the lower insulating member 400, the vent 410 is located in the middle of the lower insulating member 400 and is correspondingly arranged with respect to the explosion-proof hole 110. The correspondence between the vent 410 and the explosion-proof hole 110 means that the projection of the explosion-proof hole 110 on the lower insulating member 400 at least partially overlaps with the vent 410.

[0049] The fourth mounting hole 420 is located on one side of the vent hole 410 and is spaced apart from the vent hole 410. There are two fourth mounting holes 420. Along the length of the lower insulating member 400, the two fourth mounting holes 420 are located at opposite ends of the vent hole 410. Specifically, one fourth mounting hole 420 is located on one side of the vent hole 410 and communicates with one first mounting hole 120 for the positive terminal to pass through. The other fourth mounting hole 420 is located on the other side of the vent hole 410 and communicates with another first mounting hole 120 for the negative terminal to pass through.

[0050] Along the thickness direction of the end cap assembly 3000, the explosion-proof valve 200 covers the opening of the explosion-proof hole 110 near the lower insulating member 400. In the event of thermal runaway of the energy storage device 1000, the gas inside the energy storage device 1000 can pass through the vent hole 410 to the bottom of the explosion-proof valve 200, and be discharged to the outside of the energy storage device 1000 after the explosion-proof valve 200 opens, ensuring the safe operation of the energy storage device 1000. The protective plate 300 covers the opening of the explosion-proof hole 110 away from the lower insulating member 400 and protects the explosion-proof valve 200.

[0051] Please continue reading. Figure 3 and Figure 6 Each pin 510 is provided with a fifth mounting hole 511. Along the thickness direction of the pin 510, the fifth mounting hole 511 passes through the pin 510 and communicates with a fourth mounting hole 420 for the pole post 520 to pass through.

[0052] Please refer to the following: Figure 7 , Figure 7 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly 3000 taken at another angle along point AA. Figure 7 The end cap assembly 3000 shown does not include the plate 900.

[0053] Each upper insulating member 700 passes through a first mounting hole 120 and a fourth mounting hole 420. Each upper insulating member 700 includes a first surface 701, a second surface 702, and a second peripheral side surface 703. The first surface 701 is the surface of the upper insulating member 700 facing away from the end cap 100. Along the thickness direction of the upper insulating member 700, the second surface 702 is disposed opposite to the first surface 701. The second peripheral side surface 703 connects the first surface 701 and the second surface 702.

[0054] Each upper insulating member 700 is provided with a second mounting hole 710 and a mounting groove 720. The second mounting hole 710 penetrates the upper insulating member 700 along its thickness direction and communicates with the first mounting hole 120. The second mounting hole 710 penetrates both the first surface 701 and the second surface 702. Specifically, the opening of the mounting groove 720 is located on the first surface 701. The mounting groove 720 is recessed from the first surface 701 towards the second surface 702. The mounting groove 720 surrounds and communicates with the second mounting hole 710. The mounting groove 720 includes a second groove bottom wall surface 721 and a second groove side wall surface 722. The second groove bottom wall surface 721 is disposed opposite to the opening of the mounting groove 720. The second groove side wall surface 722 surrounds the second groove bottom wall surface 721 and connects the second groove bottom wall surface 721 and the first surface 701. For example, the mounting groove 720 is hexagonal.

[0055] Each upper insulating element 700 is further provided with a protrusion 730. The protrusion 730 is provided on the second surface 702 and protrudes from the second surface 702 in a direction away from the first surface 701, and is disposed around the second mounting hole 710. The protrusion 730 is located between the hole wall surface and the second peripheral side surface 703 of the second mounting hole 710, and is spaced apart from the second peripheral side surface 703. Specifically, the protrusion 730 extends into the first mounting hole 120 and the fourth mounting hole 420. The protrusion 730 is provided with a third through hole 731. The third through hole 731 penetrates the protrusion 730 along its thickness direction and communicates with the second mounting hole 710. For example, the hole wall surface of the third through hole 731 is flush with the hole wall surface of the second mounting hole 710.

[0056] Please continue reading. Figures 6 to 9 , Figure 8 yes Figure 3 The diagram shows the structure of the pressure block 600 in the end cap assembly 3000. Figure 9 yes Figure 8 The diagram shows the structure of the pressure block 600 at another angle.

[0057] Each pressing block 600 includes a first pressing block portion 610, a second pressing block portion 620, and a connecting portion 630. The first pressing block portion 610 is mounted in a mounting groove 720. The first pressing block portion 610 includes a fifth surface 611, an eighth surface 612, and a third peripheral side surface 613. The fifth surface 611 is the surface of the first pressing block portion 610 facing away from the bottom wall surface 721 of the second groove. Along the thickness direction of the first pressing block portion 610, the eighth surface 612 is disposed opposite to the fifth surface 611 and abuts against the bottom wall surface 721 of the second groove. The third peripheral side surface 613 connects the fifth surface 611 and the eighth surface 612 and is disposed opposite to the side wall surface 722 of the second groove. The first pressing block portion 610 is provided with a third mounting hole 614. The third mounting hole 614 penetrates the first pressing block portion 610 along the thickness direction of the pressing block 600 and communicates with the second mounting hole 710. The third mounting hole 614 penetrates the fifth surface 611 and the eighth surface 612. For example, the structure of the first pressing block 610 is adapted to the structure of the mounting groove 720, and the first pressing block 610 is hexagonal.

[0058] The second pressing block 620 is located on the side of the first pressing block 610 opposite to the upper insulating member 700, and also on the side of the first pressing block 610 opposite to the bottom wall surface 721 of the second groove, and is spaced apart from the first pressing block 610, and is used for welding with the plate 900. Along the thickness direction of the end cap assembly 3000, the second pressing block 620 is spaced apart from and opposite to the first surface 701. During the welding process between the second pressing block 620 and the plate 900, because the second pressing block 620 is spaced apart from the first surface 701, the welding heat cannot be directly transferred from the second pressing block 620 to the upper insulating member 700, which can prevent the upper insulating member 700 from melting due to welding heat, thus ensuring the structural stability of the upper insulating member 700, improving the assembly stability of the end cap assembly 3000, and enhancing the safety performance of the energy storage device 1000. The distance between the second pressing block 620 and the first surface 701 is L, where L ≥ 0.2 mm, to ensure that the distance between the second pressing block 620 and the upper insulating member 700 is large enough to increase the path of welding heat transfer to the upper insulating member 700 through the air, so as to ensure that the upper insulating member 700 will not melt due to welding heat, thereby ensuring the structural stability of the upper insulating member 700, improving the assembly stability of the end cap assembly 3000, and enhancing the safety performance of the energy storage device 1000.

[0059] The second pressing block portion 620 includes a ninth surface 621, a tenth surface 622, and a first peripheral side surface 623. The ninth surface 621 is the surface of the second pressing block portion 620 away from the upper insulating member 700. Along the thickness direction of the second pressing block portion 620, the tenth surface 622 is disposed opposite to the ninth surface 621 and spaced apart from the first surface 701 of the upper insulating member 700. The distance between the tenth surface 622 and the first surface 701 is L, where L ≥ 0.2 mm. The first peripheral side surface 623 connects the ninth surface 621 and the tenth surface 622, and is located on the side of the second groove sidewall 722 facing away from the mounting groove 720, spaced apart from the second groove sidewall 722. The first peripheral side surface 623 also surrounds the second peripheral side surface 703, and is located on the side of the second peripheral side surface 703 facing away from the mounting groove 720, spaced apart from the second peripheral side surface 703.

[0060] In this embodiment, the first peripheral side 623 includes a first peripheral face 623a and a second peripheral face 623b. The first peripheral face 623a is connected to the tenth surface 622. The second peripheral face 623b is located on the side of the first peripheral face 623a away from the first pressing block portion 610, and is connected to the first peripheral face 623a and the ninth surface 621. The second peripheral face 623b is a chamfered surface.

[0061] The second pressing block portion 620 is provided with a first through hole 624. The first through hole 624 penetrates the second pressing block portion 620 along its thickness direction. Specifically, the first through hole 624 penetrates the ninth surface 621 and the tenth surface 622, and is spaced apart from the first peripheral side surface 623. The wall surface of the first through hole 624 surrounds the wall surface of the third mounting hole 614, and is located on the side of the third mounting hole 614 away from the third mounting hole 614, and is spaced apart from the wall surface of the third mounting hole 614. The first through hole 624 includes a first hole portion 624a and a second hole portion 624b. The second hole portion 624b is located on the side of the first hole portion 624a away from the first pressing block portion 610, and communicates with the first hole portion 624a. Along the direction from the first hole portion 624a to the second hole portion 624b, the cross-sectional area of ​​the second hole portion 624b gradually increases. The wall surface of the second hole portion 624b is a chamfered surface.

[0062] The connecting portion 630 is fixedly connected between the second pressing block portion 620 and the first pressing block portion 610. Specifically, the connecting portion 630 is fixedly connected between the fifth surface 611 and the tenth surface 622, and is located between the hole wall surface of the third mounting hole 614 and the first peripheral side surface 623. The connecting portion 630 includes a fourth peripheral side surface 631. The fourth peripheral side surface 631 is connected between the tenth surface 622 and the fifth surface 611. For example, the fourth peripheral side surface 631 is flush with the third peripheral side surface 613. The connecting portion 630 is provided with a second through hole 632. The second through hole 632 penetrates the connecting portion 630 along its thickness direction and connects the first through hole 624 and the third mounting hole 614. The hole wall surface of the second through hole 632 surrounds the hole wall surface of the third mounting hole 614, and is located on the side of the hole wall surface of the third mounting hole 614 away from the third mounting hole, and is spaced apart from the hole wall surface of the third mounting hole 614. For example, the wall surface of the second through hole 632 is flush with the wall surface of the first through hole 624.

[0063] Please continue reading. Figure 6 Along the thickness direction of the end cap assembly 3000, each pole post 520 passes through a fifth mounting hole 511, a fourth mounting hole 420, a first mounting hole 120, a second mounting hole 710, and a third mounting hole 614, and is fixedly connected to a first pressure block portion 610. For example, the pole post 520 can be fixedly connected to the first pressure block portion 610 by seam welding. Specifically, during the welding process between the pole post 520 and the first pressure block portion 610, a welding copper nozzle presses against the ninth surface 621, and pressure is applied from the second pressure block portion 620 towards the first pressure block portion 610, allowing the pressure block 600, the upper insulating member 700, and the end cap 100 to fit tightly together, thereby welding and fixing the hole wall of the third mounting hole 614 to the fifth peripheral side surface 523, forming the first welding position 1. It should be noted that the first side 623 is located on the side of the second side 703 away from the mounting groove 720 and is spaced apart from the second side 703. This allows the area of ​​the ninth surface 621 to be large enough to increase the surface area of ​​the end cap assembly 3000 for supporting the welding copper nozzle, which facilitates the stable placement of the welding copper nozzle and is beneficial for applying pressure to the pressure block 600, thereby improving the structural compactness and assembly stability of the end cap assembly 3000.

[0064] Each pole post 520 also passes through a third through hole 731. Each pole post 520 includes a sixth surface 521, a seventh surface 522, and a fifth peripheral side surface 523. The sixth surface 521 faces the same direction as the fifth surface 611 and protrudes relative to the fifth surface 611 to facilitate welding and fixing to the plate 900. Along the thickness direction of the end cap assembly 3000, the seventh surface 522 is disposed opposite to the sixth surface 521. The fifth peripheral side surface 523 connects between the sixth surface 521 and the seventh surface 522 and is fixedly connected to the hole wall of the third mounting hole 614. The fifth peripheral side surface 523 is also disposed opposite to the hole wall of the third through hole 731.

[0065] In this embodiment, the area of ​​the sixth surface 521 is smaller than the area of ​​the seventh surface 522. During the assembly of the end cap assembly 3000, the pole piece 520 is assembled using a back-side mounting method. That is, the pole piece 520 is installed from the lower insulating member 400 toward the end cap 100. Specifically, the pole piece 520 sequentially passes through the fifth mounting hole 511 of the pin 510, the fourth mounting hole 420 of the lower insulating member 400, the first mounting hole 120 of the end cap 100, the second mounting hole 710 of the upper insulating member 700, and the third mounting hole 614 of the first pressing block portion 610.

[0066] Each sealing ring 800 is fitted onto a pole post 520 and passes through a fourth mounting hole 420, and is clamped between the end cap 100 and the pole post 520. The sealing rings 800 not only seal the gap between the end cap 100 and the pole post 520, ensuring good airtightness of the end cap assembly 3000, but also insulate the end cap 100 and the pole post 520, preventing short circuits between them.

[0067] Please refer to the following: Figure 10 , Figure 10 yes Figure 3 The diagram shows the structure of the end cap assembly 3000 with the plate 900 at another angle.

[0068] Each pad 900 is located on the side of the first pressing block 610 away from the end cap 100, and on the side of the sixth surface 521 away from the seventh surface 522, and is fixedly connected to both the first pressing block 610 and the pole post 520. Specifically, each pad 900 includes a third surface 901 and a fourth surface 902. The third surface 901 is the surface of the pad 900 facing the first pressing block 610. Along the thickness direction of the pad 900, the fourth surface 902 is disposed opposite to the third surface 901.

[0069] Each bar plate 900 is provided with a groove 910. The opening of the groove 910 is located on the fourth surface 902. The groove 910 is recessed from the fourth surface 902 toward the third surface 901. The groove 910 includes a first groove bottom wall surface 911 and a first groove side wall surface 912. The first groove bottom wall surface 911 is disposed opposite to the opening of the groove 910 and is located between the third surface 901 and the fourth surface 902. The first groove side wall surface 912 is disposed around the first groove bottom wall surface 911 and connects the first groove bottom wall surface 911 and the fourth surface 902. The second pressing block portion 620 extends into the groove 910 and is fixedly connected to the bar plate 900, which can limit the displacement of the second pressing block portion 620 in the length and width directions of the end cap assembly 3000, thereby improving the assembly stability of the energy storage device 1000.

[0070] Since the second peripheral surface 623b and the hole wall of the second hole 624b of the second pressing block 620 are both chamfered, the hole wall of the second peripheral surface 623b and the second hole 624b can guide the second pressing block 620 into the groove 910, which is beneficial to improving the assembly efficiency of the end cap assembly 3000. For example, the second pressing block 620 can be fixedly connected to the plate 900 by through welding. During the assembly process between the second pressing block 620 and the plate 900, the first groove bottom wall 911 of the plate 900 and the ninth surface 621 can be welded by through welding to form the second welding position 2. It should be noted that the first peripheral side 623 is located on the side of the second peripheral side 703 away from the mounting groove 720 and is spaced apart from the second peripheral side 703, which can also ensure that the welding area between the second pressing block 620 and the plate 900 is large enough, further improving the assembly stability of the end cap assembly 3000.

[0071] Each plate 900 is further provided with a welding portion 920. The welding portion 920 is provided on the bottom wall surface 911 of the first groove and protrudes from the bottom wall surface 911 in a direction away from the third surface 901, and is spaced apart from the side wall surface 912 of the first groove. The welding portion 920 passes through the first through hole 624 and the second through hole 632, and is fixedly connected to the pole post 520. It should be noted that since the hole wall surface of the second hole 624b is a chamfered surface, the hole wall surface of the second hole 624b can guide the welding portion 920 to extend into the first through hole 624 and the second through hole 632.

[0072] Since the wall surfaces of the first through hole 624 and the second through hole 632 are both located on the side of the wall surface of the third mounting hole 614 away from the third mounting hole 614, the first through hole 624 and the second through hole 632 can be ensured to be large enough to facilitate the insertion of the welding part 920 into the first through hole 624 and the second through hole 632, which is beneficial to further improve the assembly efficiency of the end cap assembly 3000. In addition, the sixth surface 521 of the pole post 520 protrudes relative to the fifth surface 611 of the first pressing block part 610, which can ensure the assembly reliability between the welding part 920 and the pole post 520, and facilitate the fixed connection between the welding part 920 and the pole post 520, thereby improving the assembly stability of the end cap assembly 3000.

[0073] The welding part 920 includes a welding surface 921. The welding surface 921 is located on the side of the bottom wall surface 911 of the first groove away from the third surface 901 and is fixedly connected to the sixth surface 521. For example, the welding part 920 can be fixedly connected to the pole post 520 by through welding. During the assembly process of the plate 900 and the pole post 520, the welding surface 921 of the plate 900 and the sixth surface 521 of the pole post 520 can be welded by through welding to form the third welding position 3.

[0074] In this embodiment, the current generated by the battery cell assembly can be guided directly from the terminal post 520 through the third welding position 3 to the platen 900, or it can be guided from the terminal post 520 through the first welding position 1 to the pressure block 600, and then through the second welding position 2 to the platen 900. That is, there are two current passages from the terminal post 520 to the platen 900, which enhances the current carrying capacity of the end cap assembly 3000 and improves the energy efficiency and product competitiveness of the energy storage device 1000.

[0075] This application, by setting a second pressing block 620 and spacing it apart from the upper insulating member 700, prevents welding heat from being directly transferred from the second pressing block 620 to the upper insulating member 700 during welding of the bar sheet 900 and the second pressing block 620. This avoids the upper insulating member 700 from melting due to welding heat, improves the structural stability of the upper insulating member 700, and ensures the assembly stability of the end cover 100, pressing block 600, and pole post 520 in the thickness direction of the end cover assembly 3000. It also ensures that the sealing ring 800 is always clamped between the end cover 100 and the pole post 520, thus ensuring the sealing effectiveness of the sealing ring 800. This is beneficial to improving the assembly stability and operational reliability of the energy storage device 1000. In addition, by welding and fixing the pad 900 to the second pressing block 620, and welding and fixing the welding part 920 of the pad 900 to the pole post 520, the number of current channels flowing from the pole post 520 to the pad 900 can be increased, thereby improving the current carrying capacity of the end cover assembly 3000, which is conducive to improving the energy efficiency and product competitiveness of the energy storage device 1000.

[0076] This application also provides an electrical device, such as an energy storage cabinet or a new energy vehicle. This electrical device includes the energy storage device 1000 described in the above embodiments. Since the specific structure and technical effects of the energy storage device 1000 have already been described in detail above, they will not be repeated here. The electrical device provided in this embodiment improves the performance and product competitiveness of the electrical device by incorporating the aforementioned energy storage device 1000.

[0077] The above descriptions are merely optional embodiments of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this application and are not intended to limit the patent scope of this application. At the same time, for those skilled in the art, equivalent structural transformations made based on the concept of this application using the specification and drawings of this application, or direct / indirect applications in other related technical fields, are all included within the patent protection scope of this application.

Claims

1. An end cap assembly, characterized by, Includes end caps, upper insulating components, pressure blocks, and pole posts; The end cap is provided with a first mounting hole, which penetrates the end cap along the thickness direction. Along the thickness direction of the end cap, the upper insulating member is installed on one side of the end cap. The upper insulating member includes a first surface and a second surface. The first surface is the surface of the upper insulating member that faces away from the end cap. The second surface is disposed opposite to the first surface. The upper insulating member is provided with a second mounting hole. The second mounting hole penetrates the first surface and the second surface and communicates with the first mounting hole. The pressure block includes a first pressure block portion, a second pressure block portion, and a connecting portion. The first pressure block portion is mounted on the upper insulating member and has a third mounting hole. The third mounting hole penetrates the first pressure block portion along the thickness direction of the pressure block and communicates with the second mounting hole. The second pressure block portion is located on the side of the first pressure block portion away from the upper insulating member and is used for welding with the plate. Along the thickness direction of the end cap assembly, the second pressure block portion is spaced apart from and opposite to the first surface. The second pressure block portion has a first through hole that penetrates the second pressure block portion along the thickness direction of the pressure block. The connecting portion is fixedly connected between the first pressure block portion and the second pressure block portion. The connecting portion has a second through hole that penetrates the connecting portion along the thickness direction of the pressure block and communicates with the third mounting hole and the first through hole. The pole is inserted through the first mounting hole, the second mounting hole and the third mounting hole, and is fixedly connected to the first pressure block.

2. The end cap assembly of claim 1, wherein, Along the thickness direction of the end cap assembly, the distance between the second pressing block and the first surface is L, where L ≥ 0.2 mm.

3. The end cap assembly of claim 1 or 2, wherein, The end cap assembly further includes a bar sheet located on the side of the first pressing block portion away from the end cap. The bar sheet includes a third surface and a fourth surface. The third surface is the surface of the bar sheet facing the first pressing block portion, and the fourth surface is disposed opposite to the third surface. The bar sheet is provided with a groove, and the opening of the groove is located on the fourth surface. The second pressing block extends into the groove and is fixedly connected to the plate.

4. The end cap assembly of claim 3, wherein, The groove includes a first bottom wall and a first side wall. The first bottom wall is disposed opposite to the opening of the groove, and the first side wall surrounds the first bottom wall and connects the first bottom wall and the fourth surface. The plate is provided with a welding part, which is located on the bottom wall of the first groove and spaced apart from the side wall of the first groove. The welding part passes through the first through hole and the second through hole and is fixedly connected to the pole post.

5. The end cap assembly of claim 4, wherein, The wall surfaces of the first through hole and the second through hole are both arranged around the wall surface of the third mounting hole, and are both located on the side of the wall surface of the third mounting hole away from the third mounting hole, and are spaced apart from the wall surface of the third mounting hole.

6. An end cap assembly according to claim 4 or 5, wherein, The first through hole includes a first hole portion and a second hole portion. The second hole portion is located on the side of the first hole portion away from the first pressure block portion and is connected to the first hole portion. Along the direction from the first hole portion to the second hole portion, the cross-sectional area of ​​the second hole portion gradually increases.

7. The end cap assembly of claim 1 or 2, wherein, The upper insulating member is further provided with a mounting groove, the opening of the mounting groove is located on the first surface, the mounting groove is arranged around the second mounting hole and communicates with the second mounting hole, the mounting groove includes a second groove bottom wall surface, the second groove bottom wall surface is arranged opposite to the opening of the mounting groove; The first pressing block is installed in the mounting groove.

8. The end cap assembly of claim 7, wherein, The mounting groove also includes a second groove sidewall, which surrounds the second groove bottom wall and connects the second groove bottom wall and the first surface; The second pressing block includes a first peripheral side surface, which surrounds the second groove side wall and is located on the side of the second groove side wall opposite to the mounting groove, and is spaced apart from the second groove side wall. The first peripheral side surface includes a first peripheral face and a second peripheral face, which is located on the side of the first peripheral face opposite to the first pressing block and is connected to the first peripheral face. The second peripheral face is a chamfered surface.

9. The end cap assembly of claim 8, wherein, The upper insulating member further includes a second peripheral side, which is connected between the first surface and the second surface; The first circumferential side is arranged around the second circumferential side and is located on the side of the second circumferential side that is away from the mounting groove, and is spaced apart from the second circumferential side.

10. The end cap assembly of claim 1 or 2, wherein, The first pressing block portion includes a fifth surface, which is the surface of the first pressing block portion that faces away from the end cap; The pole post includes a sixth surface, which faces the same direction as the fifth surface and protrudes relative to the fifth surface.

11. The end cap assembly of claim 10, wherein, The pole post also includes a seventh surface, which is disposed opposite to the sixth surface along the thickness direction of the end cap assembly, and the area of ​​the sixth surface is smaller than the area of ​​the seventh surface.

12. An energy storage device, characterized by, The energy storage device includes a housing, a cell assembly, and an end cap assembly as described in any one of claims 1 to 11. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing, closes the opening, and is electrically connected to the cell assembly.

13. An electrical device, characterized by The device includes the energy storage device of claim 12, which is used to supply power to the electrical equipment.

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