End cap assemblies, energy storage devices and electrical equipment

Abstract

This application provides an end cap assembly, an energy storage device, and an electrical device. The end cap assembly includes a lower insulating member, a positive electrode post, a positive electrode connecting piece, and an insulating protective sleeve. The lower insulating member has a first surface and a second surface. The lower insulating member is provided with a positive electrode post through hole and a clearance groove. The positive electrode post through hole penetrates the first surface and the second surface. The opening of the clearance groove is located on the second surface. The positive electrode post passes through the positive electrode post through hole. The positive electrode connecting piece is located on the side of the second surface away from the first surface. The positive electrode connecting piece includes a first connecting portion, a second connecting portion, and a fusible portion. The fusible portion connects between the first connecting portion and the second connecting portion and is correspondingly disposed with the clearance groove. The insulating protective sleeve includes a first insulating portion. The first insulating portion is located on the side of the fusible portion facing the clearance groove and covers the fusible portion and is accommodated in the clearance groove.

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] Current energy storage batteries, such as prismatic hard-case batteries, typically have a connecting tab between the tab and the terminal. The main function of this connecting tab is to transfer current between the terminal and the tab. Because batteries pose a risk of fire and explosion in the event of an external short circuit, the current connecting tab can disconnect in time, thus breaking the external circuit and stopping the short circuit. However, misalignment of the connecting tab with the lower insulation component can lead to poor connection between the connecting tab and the terminal. Summary of the Invention

[0003] The purpose of this application is to provide an end cap assembly, an energy storage device, and an electrical device. Using this end cap assembly can avoid the problem of poor connection between the positive electrode connector and the positive electrode tab.

[0004] This application provides an end cap assembly, the end cap assembly comprising:

[0005] The lower insulating member has a first surface and a second surface. The first surface and the second surface are arranged opposite to each other along the thickness direction of the lower insulating member. The lower insulating member is provided with a positive electrode through hole and a relief groove. The positive electrode through hole penetrates the first surface and the second surface. The relief groove is located on one side of the positive electrode through hole and is spaced apart from the positive electrode through hole. The opening of the relief groove is located on the second surface.

[0006] Positive terminal, the positive terminal is inserted through the positive terminal through hole;

[0007] The positive electrode connecting piece is located on the side of the second surface away from the first surface. The positive electrode connecting piece includes a first connecting part, a second connecting part, and a fuse part. The first connecting part is fixedly connected to the positive electrode post. The second connecting part is spaced apart from the first connecting part and is used to be fixedly connected to the positive electrode tab. The fuse part is connected between the first connecting part and the second connecting part and is correspondingly provided with the clearance groove.

[0008] The insulating protective sleeve includes a first insulating part located on the side of the fusible part facing the clearance groove, and covering the fusible part and being accommodated within the clearance groove.

[0009] In the end cap assembly provided in this application embodiment, by providing a positive electrode connecting piece including a fusible portion, the fusible portion of the positive electrode connecting piece can promptly melt and break the external circuit of the energy storage device when a short circuit occurs, thereby stopping the short circuit and avoiding the risk of fire and explosion of the energy storage device due to external short circuit. Furthermore, by providing an insulating protective sleeve, the supporting strength of the positive electrode connecting piece can be enhanced, and the situation where the positive electrode connecting piece can still overlap after melting can be prevented. This avoids the small electric arc generated by the overlapping of the positive electrode connecting piece after melting from igniting the electrolyte, thus preventing further heat diffusion problems.

[0010] Furthermore, by providing clearance grooves on the lower insulation component, firstly, during the assembly of the lower insulation component and the positive electrode connecting piece, the clearance grooves can be used to position the positive electrode connecting piece, preventing misalignment during assembly and ensuring proper assembly of the positive electrode connecting piece and the positive electrode tab, thus avoiding poor connection between the positive electrode piece and the positive electrode tab. Secondly, the clearance grooves avoid the protruding part of the insulating protective sleeve relative to the positive electrode connecting piece, preventing the overall thickness increase after adding the insulating protective sleeve to the positive electrode connecting piece. The increased thickness of the insulating protective sleeve could lead to poor contact between the positive electrode connecting piece and the positive electrode post, resulting in poor welding and thus ensuring a good welding effect between the positive electrode connecting piece and the positive electrode post. Thirdly, the clearance grooves provide space for the insulating protective sleeve in the positive electrode connecting piece. In the event of melting of the positive electrode connecting piece, the insulating protective sleeve can absorb most of the heat and further prevent heat dissipation, making it less likely for the insulating protective sleeve to burn the lower insulation component during heating, reducing the probability of structural deformation of the lower insulation component. On the one hand, the first insulating part of the insulating protective sleeve is accommodated in the clearance groove, which ensures that the thickness of the fused part of the positive electrode connecting piece is averaged with the thickness of the second connecting part in the positive electrode connecting piece that connects to the positive electrode tab, thereby avoiding the problem of the second connecting part in the positive electrode connecting piece that connects to the positive electrode tab lifting up.

[0011] In one possible implementation, the thickness of the insulating protective sleeve is H1, the depth of the clearance groove is H2, and the height of the positive electrode post protruding relative to the second surface is h, where H1-H2≤h, which facilitates the fit between the positive electrode connecting piece and the positive electrode post, thereby ensuring the welding yield between the positive electrode connecting piece and the positive electrode post.

[0012] In one possible implementation, the insulating protective sleeve includes a first part and a second part connected to the first part. The first part includes a first insulating portion, and the second part is fixedly connected to the positive electrode connecting piece. The width of the first insulating portion is W1, and the width of the clearance groove along the extension direction of the lower insulating member is W2, where W2 > W1, to ensure that the first insulating portion covering the fuse portion is located within the clearance groove, thereby ensuring that the first insulating portion is accommodated within the clearance groove.

[0013] In one possible implementation, the first part is sleeved on the outside of the fusible portion, and the first part further includes a second insulating part located on the side of the fusible portion away from the avoidance groove and covering the fusible portion.

[0014] In one possible implementation, the lower insulating member is provided with a liquid injection hole that penetrates the lower insulating member and, along the extending direction of the lower insulating member, the clearance groove is located between the positive electrode post through hole and the liquid injection hole.

[0015] In one possible implementation, the second connection portion is provided with a clearance space that extends through the second connection portion along the thickness direction of the positive electrode connecting piece. The liquid injection hole is located within the projection of the clearance space onto the lower insulating member along the thickness direction of the lower insulating member. The insulating protective sleeve is provided with a first notch that extends through the insulating protective sleeve and has its opening facing the liquid injection hole, thereby achieving clearance for the liquid injection hole and preventing the liquid injection efficiency of the energy storage device from being affected when the positive electrode connecting piece and the insulating protective sleeve overlap with the lower insulating member.

[0016] In one possible implementation, the fuse section is provided with a second notch that penetrates the fuse section and has its opening facing the second connection section. The second notch extends along the extension direction of the positive electrode connecting piece and toward the injection hole. The bottom wall of the first notch extends beyond the bottom wall of the second notch. The portion of the insulating protective sleeve that extends beyond the bottom wall of the second notch can increase the torque of the fuse section, ensuring the structural strength of the positive electrode connector at the fuse section and preventing the positive electrode connecting piece from breaking during vibration of the energy storage device.

[0017] In one possible implementation, along the extending direction of the positive electrode connector, the distance between the bottom wall of the first notch and the bottom wall of the second notch is h1, and the distance between the end face of the second connection portion away from the fuse portion and the bottom wall of the second notch is h2, where 0.10 < h1 / h2 < 0.24. This can avoid the problem of the positive electrode connector lifting due to the short torque of the fuse portion, and also avoid the problem of the positive electrode connector overcurrent, excessive heat generation, and the welding area between the positive electrode connector and the positive electrode tab being too short due to the long torque of the fuse portion.

[0018] In one possible implementation, the thickness of the first connecting part is D1, the thickness of the second connecting part is D2, and the thickness of the fused part is D3, wherein D3 satisfies: D3 < D1 and D3 < D2.

[0019] This application embodiment also provides an energy storage device, which includes a battery cell and an end cap assembly as described above, with a second connecting portion fixedly connected to the positive electrode tab of the battery cell.

[0020] In one possible implementation, the battery cell further includes a negative electrode tab, the lower insulating member further includes a negative electrode post through hole, a relief groove is located between the positive electrode post through hole and the negative electrode post through hole, and the energy storage device further includes a negative electrode post and a negative electrode connecting piece, the negative electrode post is inserted through the negative electrode post through hole, and the negative electrode connecting piece is connected between the negative electrode post and the negative electrode tab.

[0021] In this design, the contact area between the positive electrode connector and the positive electrode post is S1, and the contact area between the negative electrode connector and the negative electrode post is S2, where S1 > S2. By setting the contact area S1 between the positive electrode connector and the positive electrode post to be greater than the contact area S2 between the negative electrode connector and the negative electrode post, the current-conducting area of ​​the positive electrode connector is increased. This helps to ensure that the positive and negative electrode connectors have the same current-conducting efficiency, thereby ensuring the consistency of the positive and negative electrode fuse failure.

[0022] This application embodiment also provides an electrical device, which includes the above-mentioned energy storage device, and the energy storage device is used to supply power to the electrical device.

[0023] This application also provides a method for assembling an energy storage device, the method comprising:

[0024] An intermediate assembly is obtained by assembling a battery cell, a positive electrode connector, and an insulating protective sleeve. The battery cell includes a positive electrode tab, the positive electrode connector includes a first connecting part, a second connecting part, and a fuse part. The second connecting part is spaced apart from the first connecting part and is fixedly connected to the positive electrode tab of the battery cell. The fuse part is connected between the first connecting part and the second connecting part. The insulating protective sleeve includes a first insulating part that covers the fuse part.

[0025] A lower insulating member and a positive electrode post are provided. The lower insulating member has a first surface and a second surface. The first surface and the second surface are arranged opposite to each other along the thickness direction of the lower insulating member. The lower insulating member is provided with a positive electrode post through hole and a relief groove. The positive electrode post through hole penetrates the first surface and the second surface. The relief groove is located on one side of the positive electrode post through hole and is spaced apart from the positive electrode post through hole. The opening of the relief groove is located on the second surface. The positive electrode post passes through the positive electrode post through hole.

[0026] The intermediate component is placed on the side of the lower insulator with a clearance groove, the positive electrode connecting piece is located on the side of the second surface away from the first surface, and the first insulating part is accommodated in the clearance groove.

[0027] In the assembly method of the energy storage device provided in this application embodiment, during the assembly of the positive electrode connector and the lower insulating component, the first insulating part of the insulating protective sleeve is adjusted to be located in the avoidance groove, thereby preventing the positive electrode connector from being misaligned, thus avoiding the problem of poor connection between the positive electrode connector and the positive electrode ear, and at the same time avoiding interference of the positive electrode connector with the liquid injection hole of the energy storage device.

[0028] In one possible implementation, the avoidance groove includes a first groove edge line and a second groove edge line disposed opposite to each other along the width direction of the avoidance groove, and the detection module has an identification area, wherein both the first groove edge line and the second groove edge line are located within the identification area.

[0029] When the detection module detects that the insulating protective sleeve is located within the identification area and that the outline of the first insulating part overlaps with the first groove edge line or the second groove edge line, it moves the insulating protective sleeve. By setting the detection module to have an identification area, and utilizing the fact that the first and second groove edge lines of the clearance groove are located within the identification area, the detection module can identify the complete clearance groove. Simultaneously, the detection module detects whether the outline of the first insulating part of the insulating protective sleeve overlaps with the first groove edge line or the second groove edge line to determine whether the insulating protective sleeve is located within the clearance groove. Then, based on the detection results, the position of the insulating protective sleeve is adjusted to prevent the positive electrode connecting piece from being misaligned, thereby preventing the positive electrode connecting piece from interfering with the liquid injection hole of the energy storage device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This application provides an illustration of an application scenario where the energy storage device is used in an energy storage system.

[0032] Figure 2 This is a schematic diagram of the structure of the energy storage device provided in the embodiments of this application;

[0033] Figure 3 for Figure 2 An exploded structural diagram of a portion of the energy storage device shown.

[0034] Figure 4 for Figure 3 An exploded structural diagram of a portion of the end cap assembly in the energy storage device shown.

[0035] Figure 5 for Figure 4 A schematic diagram of the lower insulating component in the end cap assembly shown from another perspective;

[0036] Figure 6 for Figure 3 A schematic diagram of the positive electrode connector in the energy storage device shown.

[0037] Figure 7 for Figure 6A schematic diagram of the positive electrode connector from another perspective;

[0038] Figure 8 for Figure 7 An exploded view of the positive electrode connector shown.

[0039] Figure 9 for Figure 7 A schematic diagram of the cross-sectional structure of the positive electrode connector shown;

[0040] Figure 10 for Figure 3 A schematic diagram of the assembly structure of the positive electrode connector and the lower insulating component in the energy storage device shown.

[0041] Figure 11 for Figure 10 A schematic diagram of the cross-sectional structure of the assembly shown;

[0042] Figure 12 for Figure 11 A schematic diagram of part A in the cross-sectional structure shown;

[0043] Figure 13 This is a schematic diagram of the assembly process of the energy storage device provided in the embodiments of this application.

[0044] Reference numerals: 5000, energy storage system; 4500, power conversion device; 4000, wind power conversion device; 3000, secondary electrical equipment; 1000, energy storage device; 100, casing; 300, battery cell; 310, bare battery cell; 330, positive electrode tab; 350, negative electrode tab; 500, end cap assembly; 510, end cap; 511, first mounting hole; 513, second mounting hole; 515, connecting hole; 530, lower insulating component; 541, first surface; 543, second surface; 531. Positive terminal through hole; 533. Negative terminal through hole; 535. Injection hole; 537. Clearance groove; 11. First groove edge line; 13. Second groove edge line; 501. Lower insulating component body; 503. Injection diverter; 550. First upper insulating component; 551. First receiving groove; 560. Second upper insulating component; 561. Second receiving groove; 570. Positive terminal; 580. Negative terminal; 505. Main body; 507. Flange; 591. First conductive block; 593. Second conductive block; 599. Top cover plate; 700. Electrical connector; 71 0. Positive electrode connector; 730. Negative electrode connector; 30. Positive electrode connector; 31. First connecting part; 311. Fixing hole; 33. Fusible part; 301. Thinning groove; 303. Second notch groove; 35. Second connecting part; 331. Clearance space; 351. First connecting arm; 353. Second connecting arm; 60. Insulating protective sleeve; 601. First notch groove; 603. Third notch groove; 61. First part; 611. First insulating part; 613. Second insulating part; 63. Second part; 631. Connecting body; 633. Connecting protrusion. Detailed Implementation

[0045] 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 some embodiments of this application, and not all embodiments. 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.

[0046] Taking electrochemical energy storage as an example, this solution provides an energy storage device. The energy storage device is equipped with a set of chemical batteries. It mainly uses the chemical elements in the chemical batteries as the energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0047] Current energy storage applications are quite widespread, including energy storage on the (wind and solar) power generation side, grid-side energy storage, base station-side energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0048] (1) Large energy storage containers applied in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, realize load matching of electrical energy in time and space, enhance the absorption capacity of renewable energy, and play a significant role in grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0049] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side mainly operate under the "peak shaving and valley filling" mode. Since there are large price differences in electricity prices at peak and valley times depending on electricity demand, users with energy storage equipment usually charge the energy storage cabinet / box during the low electricity price period in order to reduce costs; and release the electricity in the energy storage equipment for use during the peak electricity price period to save on electricity costs.

[0050] It should be noted that the aforementioned energy storage containers, small and medium-sized energy storage cabinets, and small household energy storage boxes, which contain energy storage devices, can be understood as electrical equipment.

[0051] Please see Figure 1 , Figure 1 This is an application scenario diagram of the energy storage device 1000 provided in the embodiments of this application being applied to the energy storage system 5000.

[0052] The energy storage device 1000 provided in this application embodiment is applied to an energy storage system 5000. The energy storage system 5000 includes a power conversion device 4500 (photovoltaic panel), a wind power conversion device 4000 (windmill), a first electrical device (grid), a second electrical device 3000 (base station), and the energy storage device 1000. The energy storage system also includes an energy storage cabinet, in which the energy storage device 1000 is installed. The energy storage cabinet can be installed outdoors. Specifically, the first power conversion device can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 1000 stores this electrical energy and supplies it to the first or second electrical device during peak electricity demand, or provides power when the first or second electrical device experiences a power outage. The second power conversion device can convert wind energy into electrical energy. The energy storage device 1000 stores this electrical energy and supplies it to the first or second electrical device during peak electricity demand, or provides power when the first or second electrical device experiences a power outage. Among them, electrical energy can be transmitted using high-voltage cables.

[0053] It should be noted that the aforementioned first electrical equipment, second electrical equipment, and other equipment containing the energy storage device 1000 can be understood as electrical equipment.

[0054] Please see Figure 2 and Figure 3 , Figure 2This is a schematic diagram of the structure of the energy storage device 1000 provided in the embodiments of this application. Figure 3 for Figure 2 An exploded structural diagram of a portion of the energy storage device 1000 shown.

[0055] For ease of description, the following definitions are provided. Figure 2 The length direction of the energy storage device 1000 shown is the X-axis, the width direction is the Y-axis, and the height direction is the Z-axis. The X-axis, Y-axis, and Z-axis are mutually perpendicular. The directional terms such as "upper" and "lower" used in the description of the energy storage device 1000 in this application are based on the appendix to the specification. Figure 2 The description of the orientation shown, with "up" referring to the positive direction of the Z-axis and "down" referring to the negative direction of the Z-axis, does not constitute a limitation on the actual application scenario of the energy storage device 1000.

[0056] Energy storage device 1000 includes a housing 100, a battery cell 300, an electrolyte, and an end cap assembly 500. The battery cell 300 is mounted inside the housing 100, and the electrolyte fills and wets the inside of the housing 100. The end cap assembly 500 is mounted on the housing 100 and electrically connected to the battery cell 300. Exemplarily, energy storage device 1000 includes a single battery cell, a battery module, or a battery pack, etc.

[0057] Specifically, the outer shell 100 can be an aluminum shell. The outer shell 100 includes a bottom shell and a side shell, with the side shell surrounding the periphery of the bottom shell and forming a receiving cavity together with the bottom shell.

[0058] The battery cell 300 is installed in the receiving cavity of the housing 100, so that the battery cell 300 is installed inside the housing 100. The battery cell 300 includes a bare cell 310, a positive electrode tab 330, and a negative electrode tab 350. The bare cell 310 is wound from a material including a positive electrode plate, a negative electrode plate, and a separator. The separator is disposed between the positive electrode plate and the negative electrode plate. The positive electrode tab 330 is electrically connected to the positive electrode plate, and the negative electrode tab 350 is electrically connected to the negative electrode plate.

[0059] End cap assembly 500 is mounted on housing 100 and seals the opening of the receiving cavity. (See also...) Figure 4 , Figure 4 for Figure 3 This is an exploded structural diagram of a portion of the end cap assembly 500 in the energy storage device 1000. The end cap assembly 500 includes an end cap 510, a lower insulating member 530, a first upper insulating member 550, a second upper insulating member 560, a positive terminal post 570, a negative terminal post 580, a first conductive block 591, a second conductive block 593, and a top cover plate 599. The positive terminal post 570 is used for electrical connection with the positive electrode tab 330, and the negative terminal post 580 is used for electrical connection with the negative electrode tab 350, thereby achieving electrical connection between the end cap assembly 500 and the battery cell 300.

[0060] The end cap 510 is mounted on the housing 100 and seals the opening of the receiving cavity, thereby enabling the end cap assembly 500 to be mounted on the housing 100. For example, the end cap 510 is a sheet of smooth aluminum. The end cap 510 has a first mounting hole 511, a second mounting hole 513, and a connecting hole 515. The first mounting hole 511, the second mounting hole 513, and the connecting hole 515 extend through the end cap 510 along its thickness direction.

[0061] See also Figure 5 , Figure 5 for Figure 4 This is a schematic diagram of the lower insulator 530 in the end cap assembly 500 from another perspective. The lower insulator 530 is mounted on the side of the end cap 510 facing the cell 300. The lower insulator 530 has a first surface 541 and a second surface 543. Along the thickness direction of the lower insulator 530, the first surface 541 and the second surface 543 are arranged opposite to each other. The lower insulator 530 is provided with a positive terminal through hole 531, a negative terminal through hole 533, a liquid injection hole 535, and a clearance groove 537. The positive terminal through hole 531, the negative terminal through hole 533, and the liquid injection hole 535 penetrate the first surface 541 and the second surface 543, so that the positive terminal through hole 531, the negative terminal through hole 533, and the liquid injection hole 535 penetrate the lower insulator 530. Among them, the positive terminal through hole 531 and the negative terminal through hole 533 are located on opposite sides of the lower insulator 530 along its extension direction. In this embodiment, the lower insulating member 530 extends in the X-axis direction. Along the extension direction of the lower insulating member 530, that is, along the X-axis direction, the injection hole 535 is located between the positive terminal through hole 531 and the negative terminal through hole 533. The injection hole 535 connects the connecting hole 515 of the end cap 510 and the receiving cavity of the outer shell 100, so as to realize the injection of electrolyte into the receiving cavity through the connecting hole 515 and the injection hole 535.

[0062] A clearance groove 537 is located on one side of the positive electrode through hole 531 and is spaced apart from the positive electrode through hole 531. The opening of the clearance groove 537 is located on the second surface 543. The clearance groove 537 is located between the positive electrode through hole 531 and the negative electrode through hole 533. Specifically, along the extension direction of the lower insulating member 530, i.e., along the X-axis direction, the clearance groove 537 is located between the positive electrode through hole 531 and the injection hole 535. The clearance groove 537 includes a first groove edge line 11 and a second groove edge line 13, which are spaced apart along the width direction of the clearance groove 537. In this embodiment, the clearance groove 537 penetrates the lower insulating member 530 along the width direction, i.e., along the Y-axis direction. The first groove edge line 11 and the second groove edge line 13 are spaced apart along the extension direction of the lower insulating member 530, i.e., along the X-axis direction. It is understood that the first groove edge line 11 and the second groove edge line 13 are the boundary lines of the two groove sidewalls of the avoidance groove 537 along the width direction, which are opposite to the bottom wall of the avoidance groove 537. In this embodiment, the width of the avoidance groove 537 along the extension direction of the lower insulating member 530 is W2, that is, the distance between the first groove edge line 11 and the second groove edge line 13 is W2.

[0063] In this embodiment, the lower insulating member 530 includes a lower insulating member body 501 and a liquid injection diverter 503. In this embodiment, the lower insulating member body 501 and the liquid injection diverter 503 are integrally formed. The lower insulating member body 501 has a positive electrode through-hole 531, a negative electrode through-hole 533, a liquid injection hole 535, and a clearance groove 537. The liquid injection diverter 503 is installed on the side of the lower insulating member body 501 facing the battery cell 300 and communicates between the liquid injection hole 535 and the receiving cavity of the outer casing 100. The liquid injection diverter 503 has a chamber and an outlet hole. The chamber communicates with the liquid injection hole 535, and the outlet hole communicates with the chamber, so that the electrolyte injected from the liquid injection hole 535 flows through the chamber of the liquid injection diverter 503 and flows from the outlet hole into the receiving cavity of the outer casing 100.

[0064] The first upper insulating member 550 is provided with a first receiving groove 551 and a first through hole. The opening of the first receiving groove 551 is located on the surface of the first upper insulating member 550 along its thickness direction. The first through hole penetrates the bottom wall of the first receiving groove 551 and extends through the first upper insulating member 550 along its thickness direction. The second upper insulating member 560 is provided with a second receiving groove 561 and a second through hole. The opening of the second receiving groove 561 is located on the surface of the second upper insulating member 560. The second through hole extends through the second upper insulating member 560 along its thickness direction.

[0065] Both the positive terminal 570 and the negative terminal 580 pass through the lower insulating member 530, the end cap 510, and the first upper insulating member 550. Specifically, the positive terminal 570 passes sequentially through the positive terminal through hole 531 of the lower insulating member 530, the first mounting hole 511 of the end cap 510, and the first through hole of the first upper insulating member 550, and the positive terminal 570 protrudes relative to the second surface 543. In this embodiment, the first upper insulating member 550 is located between the end cap 510 and the positive terminal 570, serving to insulate and isolate the end cap 510 and the positive terminal 570. The negative terminal 580 passes sequentially through the negative terminal through hole 533 of the lower insulating member 530, the second mounting hole 513 of the end cap 510, and the second through hole of the second upper insulating member 560. In this embodiment, the second upper insulating member 560 is located between the end cap 510 and the negative terminal 580, serving to insulate and isolate the end cap 510 and the negative terminal 580.

[0066] Both the positive terminal 570 and the negative terminal 580 include a main body 505 and a flange 507. The flange 507 is connected to one end of the main body 505, and its circumferential surface protrudes relative to the circumferential surface of the main body 505. The main body 505 of the positive terminal 570 is located within the positive terminal through hole 531, the first mounting hole 511, and the first through hole. The flange 507 of the positive terminal 570 protrudes relative to the lower insulating member 530 towards the surface of the battery cell 300. The main body 505 of the negative terminal 580 is located within the negative terminal through hole 533, the second mounting hole 513, and the second through hole. The flange 507 of the negative terminal 580 protrudes relative to the lower insulating member 530 towards the surface of the battery cell 300.

[0067] The first conductive block 591 is installed in the first receiving groove 551 of the first upper insulating member 550 and is electrically connected to the positive terminal 570. The second conductive block 593 is installed in the second receiving groove 561 of the second upper insulating member 560 and is electrically connected to the negative terminal 580. In this embodiment, the first conductive block 591 is connected to the positive terminal 570, and the second conductive block 593 is connected to the negative terminal 580. The top cover plate 599 is installed on the side of the end cover 510 opposite to the lower insulating member 530 and exposes the connecting hole 515 of the first conductive block 591, the second conductive block 593, and the end cover 510.

[0068] During the assembly of the end cap assembly 500, the lower insulating component 530 and the end cap 510 are sequentially placed on the positive terminal post 570. Then, the first upper insulating component 550 and the first conductive block 591 are sequentially placed, followed by the second upper insulating component 560 and the second conductive block 593. The first conductive block 591 is pressed onto the first upper insulating component 550 and the positive terminal post 570. Then, the first conductive block 591 is riveted to the positive terminal post 570 to ensure that the first conductive block 591 is fixed on the end cap 510 before being welded to the positive terminal post 570. Finally, the first conductive block 591 is welded to the positive terminal post 570 using a front-side welding method. The second conductive block 593 is pressed onto the second upper insulating member 560 and the negative terminal 580. Then, the second conductive block 593 is riveted to the negative terminal 580 to ensure that the second conductive block 593 is fixed on the end cap 510 before being welded to the negative terminal 580. Finally, the second conductive block 593 is welded to the negative terminal 580 by front welding.

[0069] Continue reading Figure 3 In this embodiment, the end cap assembly 500 further includes an electrical connector 700, which is electrically connected to both the positive terminal 570 and the negative terminal 580, and is used for electrical connection to the battery cell 300, thereby realizing the electrical connection between the end cap assembly 500 and the battery cell 300. Specifically, the electrical connector 700 includes a positive terminal connector 710 and a negative terminal connector 730. The positive terminal connector 710 is electrically connected between the positive terminal 570 and the positive terminal tab 330 of the battery cell 300, and the negative terminal connector 730 is electrically connected between the negative terminal 580 and the negative terminal tab 350 of the battery cell 300, thereby realizing the electrical connection between the end cap assembly 500 and the battery cell 300.

[0070] See Figure 6 , Figure 7 and Figure 8 , Figure 6 for Figure 3 The diagram shows the structure of the positive electrode connector 710 in the energy storage device 1000. Figure 7 for Figure 6 The diagram shows the structure of the positive electrode connector 710 from another perspective. Figure 8 for Figure 7 The exploded structural diagram of the positive electrode connector 710 shown.

[0071] The positive electrode connector 710 includes a positive electrode connector 30 and an insulating protective sleeve 60, with the insulating protective sleeve 60 sleeved on the outside of the positive electrode connector 30.

[0072] Specifically, the positive electrode connecting piece 30 includes a first connecting portion 31, a fusible portion 33, and a second connecting portion 35, with the fusible portion 33 connecting between the first connecting portion 31 and the second connecting portion 35. In this embodiment, the first connecting portion 31, the fusible portion 33, and the second connecting portion 35 are integrally formed. The first connecting portion 31 is used for fixed connection with the positive electrode post 570, and the second connecting portion 35 is used for fixed connection with the positive electrode tab 330, thereby achieving an electrical connection of the positive electrode connecting piece 30 between the positive electrode post 570 and the positive electrode tab 330, and thus achieving an electrical connection of the positive electrode connector 710 between the positive electrode post 570 and the battery cell 300.

[0073] The contact area between the positive electrode connecting piece 30 and the positive electrode post 570 is S1, which is also the contact area between the first connecting part 31 and the positive electrode post 570. In this embodiment, the first connecting part 31 is welded to the positive electrode post 570 to achieve an electrical connection between the first connecting part 31 and the positive electrode post 570. The contact area S1 is the solder area between the first connecting part 31 and the positive electrode post 570. The first connecting part 31 is provided with a fixing hole 311, which penetrates the first connecting part 31 along its thickness direction. There can be multiple fixing holes 311, which are spaced apart. In this embodiment, there are two fixing holes 311, which are spaced apart along the width direction of the positive electrode connecting piece 30.

[0074] In this embodiment, the thickness of the first connecting portion 31 is D1, the thickness of the second connecting portion 35 is D2, and the thickness of the fuse portion 33 is D3, where D3 < D1 and D3 < D2. This ensures that the structural strength of the fuse portion 33 is less than that of the first connecting portion 31 and less than that of the second connecting portion 35. When an external short circuit occurs in the energy storage device 1000, the fuse portion 33 can fuse in time, thereby breaking the external circuit of the energy storage device 1000 and stopping the short circuit, thus avoiding the risk of fire and explosion of the energy storage device 1000 due to the external short circuit. Specifically, in this embodiment, the surface of the fuse portion 33 is provided with a thinning groove 301. The thinning groove 301 is formed by thinning at the position of the fuse portion 33 of the positive electrode connecting piece 30, so that D3 < D1 and D3 < D2. At this time, at least one of the two surfaces of the fuse portion 33 along the thickness direction is recessed relative to the surface of the first connecting portion 31 and the surface of the second connecting portion 35. It is understood that in other embodiments, other methods such as hollowing out the fuse portion 33 may be used to weaken the structural strength of the fuse portion 33. The embodiments of this application do not limit the formation method of the fuse portion 33.

[0075] The fusible portion 33 is provided with a second notch 303. The opening of the second notch 303 is located on the end face of the fusible portion 33 facing the second connecting portion 35, and the second notch 303 penetrates the fusible portion 33 along its thickness direction. The second notch 303 is used to avoid the injection hole 535 and the injection diverter 503, so as to prevent the injection efficiency from being affected when the positive electrode connecting piece 30 overlaps with the lower insulating member 530.

[0076] The second connecting portion 35 is connected to the end of the fuse portion 33 opposite to the first connecting portion 31, so that the fuse portion 33 is connected between the first connecting portion 31 and the second connecting portion 35. The second connecting portion 35 is provided with a clearance space 331, which extends through the second connecting portion 35 along its thickness direction. The clearance space 331 is used to avoid the injection hole 535 and the injection diverter 503, so as to avoid affecting the injection efficiency when the positive electrode connecting piece 30 overlaps with the lower insulating member 530. In this embodiment, the second connecting portion 35 includes a first connecting arm 351 and a second connecting arm 353. The first connecting arm 351 and the second connecting arm 353 are connected to the end of the fuse portion 33 opposite to the first connecting portion 31, and clearance spaces 331 are formed at intervals along the width direction of the positive electrode connecting piece 30. Both the first connecting arm 351 and the second connecting arm 353 are used for electrical connection with the positive electrode tab 330. In this embodiment, the second connecting part 35 is connected to the positive electrode tab 330 by welding.

[0077] The insulating protective sleeve 60 is provided with a first notch 601 and a third notch 603. The openings of the first notch 601 and the third notch 603 are respectively located on two opposite end faces of the insulating protective sleeve 60 along its extension direction, and the first notch 601 penetrates the insulating protective sleeve 60 along its thickness direction. However, the first notch 601 does not penetrate the insulating protective sleeve 60 along its extension direction, i.e., along the X-axis direction. In this embodiment, along the extension direction of the insulating protective sleeve 60, the insulating protective sleeve 60 includes a first portion 61 and a second portion 63 connected to the first portion 61. In this embodiment, the extension direction of the insulating protective sleeve 60 is the X-axis direction, and the width direction of the first portion 61 is the X-axis direction. The first portion 61 is provided with the first notch 601, the opening of which is located on the surface of the first portion 61 opposite to the second portion 63, and the first notch 601 penetrates the first portion 61 along its thickness direction. In this embodiment, the first part 61 includes a first insulating part 611 and a second insulating part 613, which are disposed opposite to each other along the thickness direction of the first part 61.

[0078] The second part 63 is connected to the side of the first part 61 opposite to the first notch 601, and the second part 63 is provided with a third notch 603. The opening of the third notch 603 is located on the end face of the second part 63 opposite to the first part 61, and the third notch 603 penetrates the second part 63 along its thickness direction. In this embodiment, the second part 63 includes a connecting body 631 and a connecting protrusion 633. The connecting body 631 is connected to the side of the first part 61 opposite to the first notch 601, and the connecting body 631 is provided with a third notch 603. The opening of the third notch 603 is located on the end face of the connecting body 631 opposite to the first part 61, and the third notch 603 penetrates the connecting body 631 along its thickness direction. The connecting protrusion 633 protrudes from the connecting body 631. In this embodiment, there are two connecting protrusions 633, which are spaced apart.

[0079] In the assembly structure of the positive electrode connector 710, the first part 61 of the insulating protective sleeve 60 is fitted onto the outside of the fusible portion 33 of the positive electrode connector 30, thereby achieving the outer side of the insulating protective sleeve 60 and the positive electrode connector 30. The first insulating portion 611 and the second insulating portion 613 of the first part 61 respectively cover the two surfaces of the fusible portion 33 along the thickness direction. The second part 63 is fixedly connected to the first connecting portion 31 of the positive electrode connector 30, and a portion of the outer surface of the first connecting portion 31 is exposed relative to the third notch 603. The connecting body 631 of the second part 63 is located outside the first connecting portion 31, and each connecting protrusion 633 is fixedly connected to the inner wall of a fixing hole 311 in the first connecting portion 31, thereby achieving a fixed connection between the second part 63 and the positive electrode connector 30, and thus achieving a fixed connection between the insulating protective sleeve 60 and the positive electrode connector 30, improving the assembly firmness between the positive electrode connector 30 and the insulating protective sleeve 60. At this time, the opening of the first notch 601 faces the second connection portion 35 of the positive electrode connection piece 30.

[0080] See also Figure 9 , Figure 9 for Figure 7 The diagram shows a cross-sectional view of the positive electrode connector 710. Along the extending direction of the positive electrode connector 30 and towards the second connecting portion 35, the insulating protective sleeve 60 extends beyond the bottom wall of the second notch groove 303 in the fusible portion 33. Specifically, along the extending direction of the positive electrode connector 30 and towards the second connecting portion 35, the bottom wall of the first notch groove 601 in the insulating protective sleeve 60 extends beyond the bottom wall of the second notch groove 303.

[0081] In this embodiment, along the extending direction of the positive electrode connecting piece 30 and towards the second connecting part 35, the distance between the bottom wall of the first notch groove 601 and the bottom wall of the second notch groove 303 is h1, and the distance between the end face of the second connecting part 35 away from the fuse part 33 and the bottom wall of the second notch groove 303 is h2, 0.10 < h1 / h2 < 0.24.

[0082] See also Figure 3 , Figure 10 and Figure 11 , Figure 10 for Figure 3 The diagram shows the assembly structure of the positive electrode connector 710 and the lower insulating component 530 in the energy storage device 1000. Figure 11 for Figure 10 The diagram shows a cross-sectional view of the assembly structure. In the assembly structure of the end cap assembly 500 and the battery cell 300, the positive electrode connecting piece 30 is electrically connected between the flange portion 507 of the positive electrode post 570 and the positive electrode ear 330 of the battery cell 300. The positive electrode connecting piece 30 covers the clearance groove 537 of the lower insulating component 530, and the first insulating portion 611 of the insulating protective sleeve 60 is accommodated in the clearance groove 537. Specifically, the first connecting portion 31 of the positive electrode connecting piece 30 is fixedly connected to the positive electrode post 570, the second connecting portion 35 is fixedly connected to the positive electrode ear 330 of the battery cell 300, and the fusible portion 33 is correspondingly provided with the clearance groove 537. The injection hole 535 of the lower insulating member 530 is located within the projection of the clearance space 331 of the second connecting portion 35 along the thickness direction of the lower insulating member 530, so that the clearance space 331 of the positive electrode connecting piece 30 can avoid the injection hole 535 and the injection diverter 503 communicating with the injection hole 535. The first insulating portion 611 of the first part 61 in the insulating protective sleeve 60 is located on the side of the fusible portion 33 facing the clearance groove 537, and covers the surface of the fusible portion 33 facing the clearance groove 537, and is accommodated in the clearance groove 537. The second insulating portion 613 is located on the side of the fusible portion 33 away from the clearance groove 537, and covers the surface of the fusible portion 33 away from the clearance groove 537.

[0083] See Figure 12 , Figure 12 for Figure 11The diagram shows the structure of part A in the cross-sectional structure. The width of the first insulating portion 611 of the first part 61 in the insulating protective sleeve 60 is W1, and the width of the clearance groove 537 along the extending direction of the lower insulating member 530 is W2, where W2 > W1. This ensures that the first insulating portion 611 covering the fusible portion 33 is located within the clearance groove 537, thus ensuring that the first insulating portion 611 is accommodated within the clearance groove 537. At this time, the openings of the first notch 601 and the second notch 303 both face the liquid injection hole 535 of the lower insulating member 530, achieving clearance between the first notch 601 and the second notch 303 and the liquid injection hole 535. This prevents the positive electrode connecting piece 30 and the insulating protective sleeve 60 from affecting the liquid injection efficiency of the energy storage device 1000 when they overlap with the lower insulating member 530. In this embodiment, along the extending direction of the positive electrode connecting piece 30 and towards the injection hole 535, the bottom wall of the first notch 601 in the insulating protective sleeve 60 extends beyond the bottom wall of the second notch 303 in the fuse portion 33, thus achieving the effect that along the extending direction of the positive electrode connecting piece 30 and towards the injection hole 535, the insulating protective sleeve 60 extends beyond the bottom wall of the second notch 303 in the fuse portion 33. In this embodiment, the bottom wall of the first notch 601 is located between the bottom wall of the second notch 303 and the end face of the fuse portion 33 facing the second connecting portion 35, so that along the direction from the first connecting portion 31 to the second connecting portion 35, the bottom wall of the first notch 601 does not exceed the end face of the fuse portion 33 facing the second connecting portion 35.

[0084] See also Figure 10 and Figure 12 In the positive electrode connecting piece 30, the surface of the first connecting portion 31 facing away from the lower insulating member 530 is exposed relative to the third notch 603, which facilitates welding the first connecting portion 31 to the positive electrode post 570 through the third notch 603, thereby increasing the soldering area of ​​the first connecting portion 31. In the insulating protective sleeve 60, the first insulating portion 611 of the first part 61 is accommodated within the clearance groove 537, that is, the edge of the first insulating portion 611 along its width direction is located between the first groove edge line 11 and the second groove edge line 13 of the clearance groove 537. The second insulating portion 613 of the first part 61 protrudes towards the cell 300 relative to the lower insulating member 530. At this time, the surface of the first insulating portion 611 of the first part 61 facing the lower insulating member 530 can be in contact with the bottom wall of the clearance groove 537, or it can be spaced apart from the bottom wall of the clearance groove 537; this application does not impose any limitations on this. In this embodiment, the height of the second insulating part 613 protruding relative to the second surface 543 of the lower insulating member 530 is less than the height of the positive electrode post 570 protruding relative to the second surface 543. In this embodiment, the thickness of the insulating protective sleeve 60 is H1, the depth of the clearance groove 537 is H2, and the height of the positive electrode post 570 protruding relative to the second surface 543 of the lower insulating member 530 is h, where H1-H2≤h.

[0085] Continue reading Figure 3 and Figure 4 The negative electrode connecting piece 730 is electrically connected between the flange portion 507 of the negative electrode post 580 and the negative electrode lug 350, thereby achieving an electrical connection between the negative electrode connecting piece 730 and the negative electrode post 580 and the negative electrode lug 350. In this embodiment, the structure of the negative electrode connecting piece 730 is the same as that of the positive electrode connecting piece 30. The negative electrode connecting piece 730 includes a first connecting portion 31, a fusible portion 33, and a second connecting portion 35. For details, please refer to the structure of the positive electrode connecting piece 30 described above, which will not be repeated here. The conductivity of the positive electrode connecting piece 30 is less than that of the negative electrode connecting piece 730. In this embodiment, the material of the positive electrode connecting piece 30 is aluminum, and the material of the negative electrode connecting piece 730 is copper.

[0086] In this embodiment, the contact area between the negative electrode connector 730 and the negative electrode post 580 is S2, that is, the solder area between the negative electrode connector 730 and the negative electrode post 580 is S2. The contact area between the positive electrode connector 30 and the positive electrode post 570 is S1 > the contact area between the negative electrode connector 730 and the negative electrode post 580 is S2. In this embodiment, the thickness of the fused portion 33 of the positive electrode connector 30 is less than the thickness of the fused portion 33 of the negative electrode connector 730, and the width of the fused portion 33 of the positive electrode connector 30 along the extending direction of the positive electrode connector 30 is greater than the width of the fused portion 33 of the negative electrode connector 730 along the extending direction of the negative electrode connector 730.

[0087] In the end cap assembly 500 provided in this application embodiment, by providing a fusible part 33 for the positive electrode connecting piece 30, the fusible part 33 of the positive electrode connecting piece 30 can be used to promptly melt and break the external circuit of the energy storage device 1000 when a short circuit occurs in the external circuit, thereby breaking the external circuit of the energy storage device 1000 and stopping the short circuit, thus avoiding the risk of fire and explosion of the energy storage device 1000 due to external short circuit. In addition, by providing an insulating protective sleeve 60 on the outside of the fusible part 33, the supporting strength of the positive electrode connecting piece 30 can be enhanced, and the situation where the positive electrode connecting piece 30 can still overlap after melting can be avoided. This avoids the problem of small electric arcs generated by the overlapping of the positive electrode connecting piece 30 after melting igniting the electrolyte or flammable gases (hydrogen, alkanes, carbon monoxide, etc.) generated by the external circuit short circuit, thereby preventing fire and explosion.

[0088] Furthermore, by providing a clearance groove 537 on the lower insulating component 530, on the one hand, when assembling the lower insulating component 530 and the positive electrode connecting piece 30, the clearance groove 537 can be used to position the positive electrode connecting piece 30 during assembly, preventing misalignment during assembly and ensuring proper assembly of the positive electrode connecting piece 30 and the positive electrode ear 330, thus avoiding poor connection between the positive electrode connecting piece 30 and the positive electrode ear 330. On the other hand, the clearance groove 537 avoids the protruding portion of the insulating protective sleeve 60 relative to the positive electrode connecting piece 30, preventing the overall thickness increase after adding the insulating protective sleeve 60 to the positive electrode connecting piece 30. This avoids the thickening of the insulating protective sleeve 60 leading to poor fit between the positive electrode connecting piece 30 and the flange portion 507 of the positive electrode post 570, thus ensuring the welding effect between the positive electrode connecting piece 30 and the positive electrode post 570. On the one hand, the clearance groove 537 provides space for the insulating protective sleeve 60 in the positive electrode connector 710. When the positive electrode connector 30 melts, the insulating protective sleeve 60 can absorb most of the heat and further prevent heat dissipation, making it less likely for the insulating protective sleeve 60 to burn the lower insulating component 530 during the heating process, thus reducing the probability of structural deformation of the lower insulating component 530. On the other hand, the first insulating part 611 of the insulating protective sleeve 60 is accommodated in the clearance groove 537, ensuring that the thickness of the melted part 33 of the positive electrode connector 30 is averaged with the thickness of the second connecting part 35 in the positive electrode connector 30 that connects to the positive electrode tab 330, thereby avoiding the problem of the second connecting part 35 in the positive electrode connector 30 that connects to the positive electrode tab 330 lifting up.

[0089] Furthermore, by using the clearance groove 537 to accommodate the first insulating part 611 of the insulating protective sleeve 60, the problem that the installation of the insulating protective sleeve 60 would encroach on the electrolyte filling space when the clearance groove 537 is not provided can be avoided, thus ensuring the electrolyte filling amount and thereby helping to improve the energy density of the assembled energy storage device 1000.

[0090] Furthermore, due to the thickness of the insulating protective sleeve 60, when the insulating protective sleeve 60 abuts against the lower insulating member 530, there may be a gap between the bottom surface of the flange portion 507 of the positive electrode connecting piece 30 and the positive electrode post 570, which may lead to poor welding between the positive electrode connecting piece 30 and the positive electrode post 570. In this embodiment, the thickness H1 of the insulating protective sleeve 60, the depth H2 of the clearance groove 537, and the height of the positive electrode post 570 protruding relative to the lower insulating member 530 are designed to satisfy: H1-H2≤h, which is conducive to the fit between the positive electrode connecting piece 30 and the positive electrode post 570, thereby ensuring the welding yield between the positive electrode connecting piece 30 and the positive electrode post 570.

[0091] Furthermore, by setting the bottom wall of the first notch 601 in the insulating protective sleeve 60 to extend beyond the bottom wall of the second notch 303, the portion of the insulating protective sleeve 60 extending beyond the bottom wall of the second notch 303 can reduce the torque after the positive electrode connecting piece 30 is connected to the positive electrode ear 330, increase the torque of the fuse part 33, ensure the structural strength of the positive electrode connector 710 at the fuse part 33, and prevent the positive electrode connecting piece 30 from breaking during the vibration of the energy storage device 1000. In addition, by setting the distance h1 between the bottom wall of the first notch 601 and the bottom wall of the second notch 303, and the distance h2 between the end face of the second connecting part 35 away from the fuse part 33 and the bottom wall of the second notch 303, the following conditions can be met: 0.10 < h1 / h2 < 0.24. On the one hand, this can avoid the problem of the positive electrode connecting piece 30 lifting due to the short torque of the fuse part 33. On the other hand, it can avoid the problem of the positive electrode connecting piece 30 overcurrent, excessive heat generation, and the short welding area between the positive electrode connecting piece 30 and the positive electrode tab 330 due to the excessive torque of the fuse part 33.

[0092] Furthermore, since the conductivity of the positive electrode connector 30 is lower than that of the negative electrode connector 730, the current conduction capacity of the positive electrode connector 30 is relatively lower than that of the negative electrode connector 730. By setting the contact area S1 between the positive electrode connector 30 and the positive electrode post 570 to be greater than the contact area S2 between the negative electrode connector 730 and the negative electrode post 580, the current conduction area of ​​the positive electrode connector 30 can be increased by increasing the contact area S1 between the positive electrode connector 30 and the positive electrode post 570. This helps to ensure that the positive electrode connector 30 and the negative electrode connector 730 have the same current conduction efficiency, and thus helps to ensure the consistency of the positive and negative electrode fuse.

[0093] However, the thermal conductivity of the negative electrode connector 730 (copper in this embodiment) is better than that of the positive electrode connector 30 (aluminum in this embodiment). In order to balance the relationship between current conduction and heat conduction, and to ensure that the positive electrode connector 30 and the negative electrode connector 730 are at the same temperature level, thereby ensuring that the positive electrode connector 30 and the negative electrode connector 730 melt simultaneously, this embodiment sets the thickness of the melting portion 33 of the positive electrode connector 30 to be less than the thickness of the melting portion 33 of the negative electrode connector 730, and / or sets the width of the melting portion 33 of the positive electrode connector 30 to be greater than that of the negative electrode connector 730. The increased width of the fusible portion 33 of the positive electrode connector 30 allows it to be thinner or wider than that of the negative electrode connector 730, making the fusible portion 33 of the positive electrode connector 30 easier to fuse. Simultaneously, the insulating protective sleeve 60 surrounding the fusible portion 33 of the positive electrode connector 30 ensures the safe equipotential of the energy storage device 1000 on both the positive and negative sides. This not only ensures a larger current-conducting area for the positive electrode connector 30 but also improves the heating capacity of the fusible portion 33, facilitating early warning of safety issues for the energy storage device 1000. Furthermore, the insulating protective sleeve 60 enhances the structural strength of the fusible portion 33, thus achieving a balance between the structural strength, current-conducting area, and safe fusibility of the positive electrode connector 30.

[0094] This application embodiment also provides an electrical device, which includes the above-mentioned energy storage device 1000, and the energy storage device 1000 is used to supply power to the electrical device.

[0095] See Figure 13 , Figure 13 This is a schematic diagram of the assembly process of the energy storage device 1000 provided in the embodiments of this application.

[0096] This application embodiment also provides an assembly method for the above-mentioned energy storage device 1000, including:

[0097] S10. Assemble the battery cell 300, positive electrode connecting piece 30, and insulating protective sleeve 60 to obtain an intermediate component. The battery cell 300 includes a positive electrode tab 330. The positive electrode connecting piece 30 includes a first connecting part 31, a second connecting part 35, and a fuse part 33. The first connecting part 31 is fixedly connected to the positive electrode post 570. The second connecting part 35 is spaced apart from the first connecting part 31 and is fixedly connected to the positive electrode tab 330 of the battery cell 300. The insulating protective sleeve 60 includes a first insulating part 611, which covers the fuse part 33.

[0098] In this embodiment, the positive electrode connecting piece 30 and the insulating protective sleeve 60 are first assembled to form a positive electrode connector 710. Then, the second connecting part 35 of the positive electrode connecting piece 30 in the positive electrode connector 710 is welded to the positive electrode tab 330 to realize the electrical connection between the positive electrode connecting piece 30 and the positive electrode tab 330, thereby realizing the electrical connection between the positive electrode connector 710 and the battery cell 300.

[0099] S20. A lower insulating member 530 and a positive electrode post 570 are provided. The lower insulating member 530 has a first surface 541 and a second surface 543. Along the thickness direction of the lower insulating member 530, the first surface 541 and the second surface 543 are arranged opposite to each other. The lower insulating member 530 is provided with a positive electrode post through hole 531 and a relief groove 537. The positive electrode post through hole 531 penetrates the first surface 541 and the second surface 543. The relief groove 537 is located on one side of the positive electrode post through hole 531 and is spaced apart from the positive electrode post through hole 531. The opening of the relief groove 537 is located on the second surface 543. The positive electrode post 570 passes through the positive electrode post through hole 531.

[0100] In this embodiment of the application, steps S10 and S20 can be interchanged.

[0101] S30. The intermediate component is placed on the side of the lower insulating member 530 where the clearance groove 537 is provided. The positive electrode connecting piece 30 is located on the side of the second surface 543 away from the first surface 541. The first insulating part 611 is accommodated in the clearance groove 537.

[0102] The intermediate component can be moved manually or automatically to move the insulating protective sleeve 60. In this embodiment, a detection module detects the position of the clearance groove 537 and the position of the insulating protective sleeve 60, and adjusts the first insulating part 611 to be accommodated in the clearance groove 537 based on the detection results of the detection module.

[0103] Specifically, the detection module has a recognition area. The first groove edge line 11 and the second groove edge line 13 of the avoidance groove 537 are both located within the recognition area. When the detection module detects that the insulating protective sleeve 60 is located within the recognition area and the outline of the first insulating part 611 overlaps with the first groove edge line 11 or the second groove edge line 13, the insulating protective sleeve 60 is moved. The avoidance groove 537 provides positioning for the recognition area of ​​the detection module. The recognition area of ​​the detection module covers the first groove edge line 11 and the second groove edge line 13 of the avoidance groove 537, thereby enabling the detection module to completely recognize the avoidance groove 537.

[0104] For example, the detection module is a CCD vision inspection device, that is, a vision inspection device that uses a charge-coupled device (CCD) as an image sensor. The CCD vision inspection device simultaneously identifies the first groove edge line 11 and the second groove edge line 13 of the avoidance groove 537, so that the CCD vision inspection device can identify the complete avoidance groove 537. Then, the CCD vision inspection device identifies the position of the insulating protective sleeve 60 based on the laser reflection at the positions of the first groove edge line 11 and the second groove edge line 13. When the CCD vision inspection device detects that the insulating protective sleeve 60 is located within the identification area, and the outline of the first insulating part 611 of the first part 61 of the insulating protective sleeve 60 in the width direction overlaps with the first groove edge line 11 or the second groove edge line 13, it means that the first insulating part 611 of the first part 61 is blocking the first groove edge line 11 or blocking the second groove edge line 13, and it can be determined that the first insulating part 611 is not in the avoidance groove 537 at this time. Then move the insulating protective sleeve 60 until the outline of the first insulating part 611 in the width direction of the insulating protective sleeve 60 does not overlap with the first groove edge line 11 and the second groove edge line 13. That is, the CCD vision inspection device can simultaneously identify the complete first groove edge line 11, second groove edge line 13 and first insulating part 611. At this time, it can be determined that the first insulating part 611 has moved into the avoidance groove 537.

[0105] In the assembly method of the energy storage device 1000 provided in this application embodiment, during the assembly of the positive electrode connector 710 and the lower insulating member 530, the first insulating part 611 of the insulating protective sleeve 60 is adjusted to be located in the avoidance groove 537, thereby preventing the positive electrode connector 30 from being misaligned, thus avoiding the problem of poor connection between the positive electrode connector 30 and the positive electrode ear 330, and at the same time avoiding the positive electrode connector 30 from interfering with the liquid injection hole 535 of the energy storage device 1000.

[0106] Furthermore, by setting the detection module to have a recognition area, and utilizing the fact that the first groove edge line 11 and the second groove edge line 13 of the avoidance groove 537 are located within the recognition area, the detection module can recognize the complete avoidance groove 537. Simultaneously, the detection module detects whether the outline of the first insulating part 611 of the insulating protective sleeve 60 overlaps with the first groove edge line 11 or the second groove edge line 13 to determine whether the insulating protective sleeve 60 is located within the avoidance groove 537. Then, based on the detection results of the detection module, the position of the insulating protective sleeve 60 is adjusted to prevent the positive electrode connecting piece 30 from being misaligned, thereby preventing the positive electrode connecting piece 30 from interfering with the liquid injection hole 535 of the energy storage device 1000.

[0107] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. An end cap assembly, characterized in that, The end cap assembly includes: The lower insulating member has a first surface and a second surface. Along the thickness direction of the lower insulating member, the first surface and the second surface are arranged opposite to each other. The lower insulating member is provided with a positive electrode through hole and a relief groove. The positive electrode through hole penetrates the first surface and the second surface. The relief groove is located on one side of the positive electrode through hole and is spaced apart from the positive electrode through hole. The opening of the relief groove is located on the second surface. A positive terminal, wherein the positive terminal is disposed in the positive terminal through hole; A positive electrode connecting piece is located on the side of the second surface opposite to the first surface. The positive electrode connecting piece includes a first connecting part, a second connecting part, and a fuse part. The first connecting part is fixedly connected to the positive electrode post. The second connecting part is spaced apart from the first connecting part and is used to be fixedly connected to the positive electrode tab. The fuse part is connected between the first connecting part and the second connecting part and is correspondingly provided with the clearance groove. The insulating protective sleeve includes a first insulating part, which is located on the side of the fused part facing the relief groove, covers the fused part, and is accommodated in the relief groove. The width of the first insulating part is W1, and the width of the relief groove along the extension direction of the lower insulating member is W2, where W2 > W1. The insulating protective sleeve is provided with a first notch, which penetrates the insulating protective sleeve and the opening of the first notch faces the second connecting part. The fusible part is provided with a second notch, the opening of which is located on the end face of the fusible part facing the second connecting part and penetrates the fusible part along the thickness direction of the fusible part. The second notch extends along the extension direction of the positive electrode connecting piece and faces the second connecting part. The bottom wall of the first notch extends beyond the bottom wall of the second notch. The thickness of the first connecting part is D1, the thickness of the second connecting part is D2, and the thickness of the fusible part is D3, where D3 satisfies: D3 < D1 and D3 < D2.

2. The end cap assembly according to claim 1, characterized in that, The thickness of the insulating protective sleeve is H1, the depth of the clearance groove is H2, and the height of the positive electrode post protruding relative to the second surface is h, where H1-H2≤h.

3. The end cap assembly according to claim 1, characterized in that, The insulating protective sleeve includes a first part and a second part connected to the first part. The first part includes the first insulating portion, and the second part is fixedly connected to the positive electrode connecting piece.

4. The end cap assembly according to claim 3, characterized in that, The first part is sleeved on the outside of the fusible part, and the first part also includes a second insulating part, which is located on the side of the fusible part away from the avoidance groove and covers the fusible part.

5. The end cap assembly according to any one of claims 1 to 4, characterized in that, The lower insulating component is provided with a liquid injection hole, which penetrates the lower insulating component and extends along the extension direction of the lower insulating component. The clearance groove is located between the positive electrode through hole and the liquid injection hole.

6. The end cap assembly according to claim 5, characterized in that, The second connecting portion is provided with a clearance space, which extends through the second connecting portion along the thickness direction. The injection hole is located within the projection of the clearance space onto the lower insulating member along the thickness direction.

7. The end cap assembly according to claim 1, characterized in that, Along the extending direction of the positive electrode connecting piece, the distance between the bottom wall of the first notch groove and the bottom wall of the second notch groove is h1, and the distance between the end face of the second connecting part away from the fuse part and the bottom wall of the second notch groove is h2, 0.10 < h1 / h2 < 0.

24.

8. An energy storage device, characterized in that, The energy storage device includes a battery cell and an end cap assembly as described in any one of claims 1 to 7, wherein the second connecting portion is fixedly connected to the positive electrode tab of the battery cell.

9. The energy storage device according to claim 8, characterized in that, The battery cell also includes a negative electrode tab, the lower insulating member also includes a negative electrode post through hole, the clearance groove is located between the positive electrode post through hole and the negative electrode post through hole, the energy storage device also includes a negative electrode post and a negative electrode connecting piece, the negative electrode post passes through the negative electrode post through hole, and the negative electrode connecting piece is connected between the negative electrode post and the negative electrode tab; Wherein, the contact area between the positive electrode connecting piece and the positive electrode post is S1, and the contact area between the negative electrode connecting piece and the negative electrode post is S2, where S1 > S2.

10. An electrical appliance, characterized in that, The electrical equipment includes an energy storage device as described in claim 8 or 9, the energy storage device being used to supply power to the electrical equipment.

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