End cover assembly, energy storage device and electric equipment

Abstract

The invention provides an end cover assembly, an energy storage device and electric equipment, the end cover assembly comprises a lower insulating part, a positive pole, a positive pole connecting piece and an insulating protective sleeve, the lower insulating part is provided with a first surface and a second surface, the lower insulating part is provided with a positive pole through hole and an avoiding groove, the positive pole through hole penetrates through the first surface and the second surface, and the first surface is provided with a positive pole; an opening of the avoiding groove is formed in the second surface, the positive pole penetrates through the positive pole through hole, the positive connecting piece is located on the side, away from the first surface, of the second surface and comprises a first connecting part, a second connecting part and a fusing part, and the fusing part is connected between the first connecting part and the second connecting part and corresponds to the avoiding groove; the insulating protective sleeve comprises a first insulating part, and the first insulating part is located on the side, facing the avoiding groove, of the fusing part, covers the fusing part and is contained in the avoiding groove.

Description

Technical Field

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

[0002] Current energy storage batteries, such as prismatic hard-shell batteries, typically feature a connector between the tab and the post. This connector primarily transfers current between the post and the tab. This poses a risk of fire and explosion in the event of an external short circuit. Current connectors can disconnect promptly in the event of an external short circuit, effectively isolating the battery's external circuit and preventing the short circuit. However, if the connector becomes misaligned with the lower insulator during assembly, it can lead to poor connection between the tab and the tab. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide an end cover assembly, an energy storage device, and an electrical device, wherein the use of the end cover assembly can avoid the problem of poor connection between the positive electrode connecting piece and the positive electrode ear.

[0004] The present application provides an end cap assembly, the end cap assembly comprising: A lower insulating member, the lower insulating member having a first surface and a second surface, the first surface and the second surface being arranged opposite to each other along the thickness direction of the lower insulating member, the lower insulating member being provided with a positive electrode through hole and an avoidance groove, the positive electrode through hole penetrating the first surface and the second surface, the avoidance groove being located on one side of the positive electrode through hole and spaced apart from the positive electrode through hole, and the opening of the avoidance groove being provided on the second surface; A positive electrode column, the positive electrode column is passed through the positive electrode column through hole; A positive electrode connecting piece, located on a side of the second surface facing away from the first surface, comprising a first connecting portion, a second connecting portion, and a fuse portion. The first connecting portion is fixedly connected to the positive electrode column, the second connecting portion is spaced apart from the first connecting portion, and is used to be fixedly connected to the positive electrode tab. The fuse portion is connected between the first connecting portion and the second connecting portion and is disposed corresponding to the avoidance groove. and an insulating protective sleeve, the insulating protective sleeve includes a first insulating portion, the first insulating portion is located on a side of the fuse portion facing the avoidance groove, covers the fuse portion, and is accommodated in the avoidance groove.

[0005] In the end cap assembly provided in the embodiments of the present application, the positive electrode connector includes a fuse. When a short circuit occurs in the external circuit of the energy storage device, the fuse of the positive electrode connector is promptly blown, thereby disconnecting the external circuit of the energy storage device and stopping the short circuit, thereby avoiding the risk of fire and explosion of the energy storage device due to an external short circuit. Furthermore, the provision of an insulating protective sleeve not only enhances the supporting strength of the positive electrode connector but also prevents the positive electrode connector from being able to overlap after it has melted. This prevents the small arc generated by the overlapping positive electrode connector after melting from igniting the electrolyte, thereby causing further heat diffusion problems.

[0006] In addition, by providing an avoidance groove on the lower insulating member, on the one hand, when assembling the lower insulating member and the positive electrode connecting piece, the avoidance groove can be used to assemble and position the positive electrode connecting piece, avoiding the lower insulating member and the positive electrode connecting piece from being skewed, thereby ensuring that the positive electrode connecting piece and the positive ear are well assembled and avoiding the problem of poor connection between the positive electrode piece and the positive ear. On the one hand, the avoidance groove is used to avoid the protruding part of the insulating protective sleeve relative to the positive electrode connecting piece, thereby avoiding the increase in the overall thickness after adding the insulating protective sleeve to the positive electrode connecting piece. Due to the thickness of the insulating protective sleeve, the positive electrode connecting piece and the positive electrode column are poorly fitted, resulting in poor welding between the positive electrode connecting piece and the positive electrode column, thereby ensuring the welding effect between the positive electrode connecting piece and the positive electrode column. On the other hand, the avoidance groove can reserve space for the insulating protective sleeve in the positive electrode connecting piece. When the positive electrode connecting piece is melted, the insulating protective sleeve can absorb most of the heat and can further prevent heat diffusion, so that the insulating protective sleeve is not easy to burn the lower insulating piece during the heating process, reducing the probability of structural deformation of the lower insulating piece. On the one hand, the first insulating portion of the insulating protective sleeve is accommodated in the avoidance groove, ensuring that the thickness of the fusing portion of the positive electrode connecting piece is averaged with the thickness of the second connecting portion of the positive electrode connecting piece connected to the positive electrode ear, thereby avoiding the problem of warping of the second connecting portion of the positive electrode connecting piece connected to the positive electrode ear.

[0007] In one possible embodiment, the thickness of the insulating protective sleeve is H1, the depth of the avoidance groove is H2, the height of the positive electrode column protruding relative to the second surface is h, H1-H2≤h, which is conducive to the fitting of the positive electrode connecting piece and the positive electrode column, thereby ensuring the welding yield between the positive electrode connecting piece and the positive electrode column.

[0008] In one possible embodiment, the insulating protective cover includes a first part and a second part connected to the first part, the first part includes a first insulating portion, 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 avoidance groove along the extension direction of the lower insulating member is W2, W2>W1, so as to ensure that the first insulating portion covering the fuse portion is located in the avoidance groove, thereby ensuring that the first insulating portion is accommodated in the avoidance groove.

[0009] In a possible implementation manner, the first portion is sleeved on the outside of the fuse portion, and the first portion further includes a second insulating portion. The second insulating portion is located on a side of the fuse portion away from the avoidance groove and covers the fuse portion.

[0010] In a possible embodiment, the lower insulating member is provided with a liquid injection hole, which passes through the lower insulating member. Along the extension direction of the lower insulating member, the avoidance groove is located between the positive electrode through hole and the liquid injection hole.

[0011] In one possible embodiment, the second connecting portion is provided with an avoidance space, which passes through the second connecting portion along the thickness direction of the positive electrode connecting piece, and the injection hole is located within the projection of the avoidance space on the lower insulating member along the thickness direction of the lower insulating member. The insulating protective sleeve is provided with a first notch groove, which passes through the insulating protective sleeve, and the opening of the first notch groove faces the injection hole, so as to achieve avoidance of the injection hole, thereby avoiding affecting the injection efficiency of the energy storage device when the positive electrode connecting piece and the insulating protective sleeve are overlapped with the lower insulating member.

[0012] In one possible embodiment, the fuse part is provided with a second notch groove, the second notch groove passes through the fuse part, and the opening of the second notch groove faces the second connecting part, along the extension direction of the positive electrode connecting piece and toward the direction of the injection hole, the bottom wall of the first notch groove exceeds the bottom wall of the second notch groove, and the part of the insulating protective cover that exceeds the bottom wall of the second notch groove can increase the torque of the fuse part, thereby ensuring the structural strength of the positive electrode connector at the fuse part and preventing the positive electrode connecting piece from breaking during the vibration of the energy storage device.

[0013] In a possible embodiment, along the extension 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 portion facing away from the fuse portion and the bottom wall of the second notch groove is h2, 0.10

[0014] In a possible implementation, the thickness of the first connecting portion is D1, the thickness of the second connecting portion is D2, and the thickness of the fuse portion is D3, where D3 satisfies: D3<D1, and D3<D2.

[0015] An embodiment of the present application further provides an energy storage device, which includes a battery cell and the end cover assembly as described above, wherein the second connecting portion is fixedly connected to the positive electrode tab of the battery cell.

[0016] In one possible embodiment, the battery cell further includes a negative electrode tab, the lower insulating member further includes a negative electrode post through-hole, the avoidance groove is located between the positive electrode post through-hole and the negative electrode post through-hole, the energy storage device further includes a negative electrode post and a negative electrode connecting piece, the negative electrode post is disposed 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; ​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. By setting the contact area S1 between the positive electrode connecting piece and the positive electrode post>the contact area S2 between the negative electrode connecting piece and the negative electrode post, the positive electrode connecting piece's flow conduction area is increased by increasing the contact area S1 between the positive electrode connecting piece and the positive electrode post, thereby facilitating the positive and negative electrode connecting pieces to have the same flow conduction efficiency, thereby facilitating the consistency of the positive and negative electrode fusing.

[0017] An embodiment of the present application further 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.

[0018] The present application also provides an energy storage device assembly method, which includes: Assembling a battery cell, a positive electrode connector, and an insulating protective sleeve to obtain an intermediate assembly, wherein the battery cell includes a positive electrode tab, the positive electrode connector includes a first connecting portion, a second connecting portion, and a fuse portion, the second connecting portion being spaced apart from the first connecting portion and fixedly connected to the positive electrode tab of the battery cell, the fuse portion being connected between the first connecting portion and the second connecting portion, and the insulating protective sleeve including a first insulating portion, the first insulating portion covering the fuse portion; A lower insulating member and a positive electrode column 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 column through hole and an avoidance groove. The positive electrode column through hole passes through the first surface and the second surface. The avoidance groove is located on one side of the positive electrode column through hole and is spaced apart from the positive electrode column through hole. The opening of the avoidance groove is provided on the second surface. The positive electrode column is provided through the positive electrode column through hole. The intermediate component is placed on the side of the lower insulating member where the avoidance groove is provided, 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 avoidance groove.

[0019] In the assembly method of the energy storage device provided in the embodiment of the present application, during the assembly of the positive electrode connector and the lower insulating member, the first insulating portion of the insulating protective sleeve is adjusted to be located within the avoidance groove, thereby preventing the positive electrode connector from being tilted, thereby avoiding the problem of poor connection between the positive electrode connector and the positive electrode ear, and at the same time avoiding the positive electrode connector from interfering with the injection of liquid into the injection hole of the energy storage device.

[0020] In a possible embodiment, the avoidance groove includes a first groove edge line and a second groove edge line arranged opposite to each other along a width direction of the avoidance groove, the detection module has an identification area, and the first groove edge line and the second groove edge line are both located in the identification area; When the detection module detects that the insulating protective cover is located within the identification area and the outline of the first insulating portion overlaps with the first groove edge line or the second groove edge line, the insulating protective cover is moved. By setting the detection module to have an identification area, the first groove edge line and the second groove edge line of the avoidance groove are located within the identification area, so that the detection module can recognize the complete avoidance groove. At the same time, the detection module detects whether the outline of the first insulating portion of the insulating protective cover overlaps with the first groove edge line or the second groove edge line to determine whether the insulating protective cover is located within the avoidance groove. Then, the position of the insulating protective cover is adjusted according to the detection result of the detection module, thereby avoiding the position of the positive electrode connecting piece from being tilted, thereby avoiding the positive electrode connecting piece from interfering with the injection of liquid from the injection hole of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A diagram showing an application scenario of the energy storage device provided in an embodiment of the present application being applied to an energy storage system; Figure 2 A schematic diagram of the structure of the energy storage device provided in an embodiment of the present application; Figure 3 for Figure 2 A schematic diagram of an exploded structure of part of the structure of the energy storage device shown; Figure 4 for Figure 3 A schematic diagram of the exploded structure of a portion of the end cap assembly in the energy storage device shown; Figure 5 for Figure 4 A schematic structural diagram of the lower insulating member in the end cap assembly shown in another perspective; Figure 6 for Figure 3 A schematic structural diagram of a positive electrode connector in the energy storage device shown; Figure 7 for Figure 6 A schematic structural diagram of the positive electrode connector shown in another perspective; Figure 8 for Figure 7 A schematic diagram of the exploded structure of the positive electrode connector shown; Figure 9 for Figure 7 A schematic cross-sectional structure diagram of the positive electrode connector shown; Figure 10 for Figure 3Schematic diagram of the assembly structure of the positive electrode connector and the lower insulating member in the energy storage device shown; Figure 11 for Figure 10 A schematic diagram of the cross-sectional structure of the assembly structure shown; Figure 12 for Figure 11 A schematic diagram of the structure of part A in the cross-sectional structure shown; Figure 13 Schematic diagram of the assembly process of the energy storage device provided in an embodiment of the present application.

[0023] Reference numerals: 5000, energy storage system; 4500, electric energy conversion device; 4000, wind energy conversion device; 3000, second electrical equipment; 1000, energy storage device; 100, housing; 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, communication hole; 530, lower insulating member; 541, first surface; 543, second surface; 531, positive electrode through hole; 533, negative electrode through hole; 535, injection hole; 537, avoidance groove; 11, first groove edge; 13, second groove edge; 501, lower insulator body; 503, injection diverter; 550, first upper insulator; 551, first accommodating groove; 560, second upper insulator; 561, second accommodating groove; 570, positive electrode; 580, negative electrode; 505, main body; 507, flange; 591, first conductive block; 593, second conductive block; 599, top cover; 700, electrical connector; 71 0. Positive electrode connector; 730. Negative electrode connector; 30. Positive electrode connector; 31. First connecting portion; 311. Fixing hole; 33. Fusing portion; 301. Thinning groove; 303. Second notch groove; 35. Second connecting portion; 331. Avoidance space; 351. First connecting arm; 353. Second connecting arm; 60. Insulating protective cover; 601. First notch groove; 603. Third notch groove; 61. First part; 611. First insulating portion; 613. Second insulating portion, 63. Second part; 631. Connecting body; 633. Connecting protrusion. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] Taking electrochemical energy storage as an example, this solution provides an energy storage device with a group of chemical batteries inside. The energy storage device mainly uses the chemical elements in the chemical batteries as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, the electricity generated by wind and solar energy is stored in the chemical batteries. When the use of external electricity reaches its peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0026] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including (wind and solar) power generation-side energy storage, grid-side energy storage, base station-side energy storage, and user-side energy storage. The corresponding energy storage device types include: (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation. (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 in the "peak shaving and valley filling" mode. Since there is a large price difference between peak and valley electricity prices according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; and then discharge the electricity in the energy storage equipment during the peak electricity price period to save electricity costs.

[0027] It should be noted that the above-mentioned energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment containing energy storage devices can be understood as electrical equipment.

[0028] See also Figure 1 , Figure 1 This is a diagram of an application scenario in which the energy storage device 1000 provided in an embodiment of the present application is applied to an energy storage system 5000.

[0029] The energy storage device 1000 provided in an embodiment of the present application is applied to an energy storage system 5000. The energy storage system 5000 includes an electric energy conversion device 4500 (photovoltaic panel), a wind energy conversion device 4000 (windmill), a first power user (grid), a second power user 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 electric energy conversion device can convert solar energy into electricity during periods of low electricity prices. The energy storage device 1000 is used to store this electricity and supply it to the first or second power user during peak electricity demand, or to provide power when the first or second power user experiences a power outage. The second electric energy conversion device can convert wind energy into electricity. The energy storage device 1000 is used to store this electricity and supply it to the first or second power user during peak electricity demand, or to provide power when the first or second power user experiences a power outage. Among them, the transmission of electric energy can be carried out using high-voltage cables.

[0030] It should be noted that the first electric device, the second electric device and other devices including the energy storage device 1000 can be understood as electric devices.

[0031] See also Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the energy storage device 1000 provided in an embodiment of the present application. Figure 3 for Figure 2 A schematic diagram of the exploded structure of part of the structure of the energy storage device 1000 is shown.

[0032] For the convenience of description, we define Figure 2 The length direction of the energy storage device 1000 is the X-axis direction, the width direction is the Y-axis direction, and the height direction is the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The terms "upper" and "lower" mentioned in the embodiment of the present application when describing the energy storage device 1000 are based on the attached specification. Figure 2 The description of the directions shown uses the positive direction of the Z axis as “up” and the negative direction of the Z axis as “down”, which does not constitute a limitation on the actual application scenario of the energy storage device 1000.

[0033] 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 housing 100, and the electrolyte fills the inside of housing 100 and soaks into the battery cell 300. The end cap assembly 500 is mounted on housing 100 and electrically connected to the battery cell 300. Exemplarily, energy storage device 1000 includes a battery cell, a battery module, or a battery pack.

[0034] Specifically, the housing 100 may be an aluminum housing, wherein the housing 100 includes a bottom housing and a side housing, wherein the side housing is disposed around the bottom housing and forms a receiving cavity with the bottom housing.

[0035] The battery cell 300 is mounted in the housing 100, allowing it to be mounted inside the housing 100. The battery cell 300 includes a bare cell 310, a positive tab 330, and a negative tab 350. The bare cell 310 is wound from a material comprising a positive electrode sheet, a negative electrode sheet, and a separator. The separator is positioned between the positive and negative electrode sheets. The positive tab 330 is electrically connected to the positive electrode sheet, and the negative tab 350 is electrically connected to the negative electrode sheet.

[0036] The end cap assembly 500 is mounted on the housing 100 and blocks the opening of the accommodating cavity. Figure 4 , Figure 4 for Figure 3 The figure shows an exploded schematic 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 insulator 530, a first upper insulator 550, a second upper insulator 560, a positive electrode column 570, a negative electrode column 580, a first conductive block 591, a second conductive block 593, and a top cover 599. The positive electrode column 570 is used to electrically connect to the positive electrode tab 330, and the negative electrode column 580 is used to electrically connect to the negative electrode tab 350, thereby achieving electrical connection between the end cap assembly 500 and the battery cell 300.

[0037] The end cap 510 is mounted on the housing 100 and blocks the opening of the accommodating cavity, thereby enabling the end cap assembly 500 to be mounted on the housing 100. Exemplarily, the end cap 510 is a plain aluminum sheet. The end cap 510 is provided with a first mounting hole 511, a second mounting hole 513, and a communication hole 515. The first mounting hole 511, the second mounting hole 513, and the communication hole 515 extend through the end cap 510 along its thickness.

[0038] See also Figure 5 , Figure 5 for Figure 4The schematic diagram of the structure of the lower insulating member 530 in the end cap assembly 500 shown in another perspective. The lower insulating member 530 is installed on the side of the end cap 510 facing the battery cell 300. 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 column through hole 531, a negative electrode column through hole 533, a liquid injection hole 535 and an avoidance groove 537. The positive electrode column through hole 531, the negative electrode column through hole 533 and the liquid injection hole 535 pass through the first surface 541 and the second surface 543 to achieve that the positive electrode column through hole 531, the negative electrode column through hole 533 and the liquid injection hole 535 pass through the lower insulating member 530. Among them, the positive electrode column through hole 531 and the negative electrode column through hole 533 are located on opposite sides of the lower insulating member 530 along the 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, i.e., along the X-axis direction, the injection hole 535 is located between the positive electrode post through-hole 531 and the negative electrode post through-hole 533. The injection hole 535 communicates between the connecting hole 515 of the end cap 510 and the accommodating cavity of the housing 100, thereby allowing electrolyte to be injected into the accommodating cavity through the connecting hole 515 and the injection hole 535.

[0039] The escape 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 escape groove 537 is located on the second surface 543. The escape groove 537 is located between the positive electrode through hole 531 and the negative electrode through hole 533. In the extension direction of the lower insulator 530, that is, along the X-axis, the escape groove 537 is located between the positive electrode through hole 531 and the injection hole 535. The escape groove 537 includes a first groove edge line 11 and a second groove edge line 13. The first groove edge line 11 and the second groove edge line 13 are spaced apart along the width direction of the escape groove 537. In this embodiment, the escape groove 537 passes through the lower insulator 530 along its width direction, that is, along the Y-axis. The first groove edge line 11 and the second groove edge line 13 are spaced apart along the extension direction of the lower insulator 530, that is, along the X-axis. It is understood that the first groove edge line 11 and the second groove edge line 13 are respectively the boundary lines of the two groove side walls along the width direction of the avoidance groove 537 away from the groove 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.

[0040] 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. Among them, the lower insulating member body 501 is provided with a positive pole through hole 531, a negative pole through hole 533, a liquid injection hole 535 and an avoidance 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 is connected between the liquid injection hole 535 and the accommodating cavity of the outer shell 100. The liquid injection diverter 503 is provided with a chamber and a liquid outlet. The chamber is connected to the liquid injection hole 535, and the liquid outlet is connected to 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 liquid outlet to the accommodating cavity of the outer shell 100.

[0041] 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 the thickness direction. The first through-hole extends through the bottom wall of the first receiving groove 551 and penetrates the first upper insulating member 550 along the 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 the thickness direction.

[0042] The positive electrode column 570 and the negative electrode column 580 are both inserted through the lower insulating member 530, the end cap 510, and the first upper insulating member 550. The positive electrode column 570 is sequentially inserted through the positive electrode column 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 electrode column 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 electrode column 570, and is used to insulate and separate the end cap 510 and the positive electrode column 570. The negative electrode column 580 is sequentially inserted through the negative electrode column 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 electrode column 580, and is used to insulate and separate the end cap 510 and the negative electrode column 580.

[0043] Both the positive electrode post 570 and the negative electrode post 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 electrode post 570 is located within the positive electrode post through-hole 531, the first mounting hole 511, and the first through-hole. The flange 507 of the positive electrode post 570 protrudes relative to the surface of the lower insulator 530 toward the battery cell 300. The main body 505 of the negative electrode post 580 is located within the negative electrode post through-hole 533, the second mounting hole 513, and the second through-hole. The flange 507 of the negative electrode post 580 protrudes relative to the lower insulator 530 toward the surface of the battery cell 300.

[0044] The first conductive block 591 is mounted in the first receiving groove 551 of the first upper insulating member 550 and is electrically connected to the positive electrode post 570. The second conductive block 593 is mounted in the second receiving groove 561 of the second upper insulating member 560 and is electrically connected to the negative electrode post 580. In this embodiment, the first conductive block 591 is connected to the positive electrode post 570, and the second conductive block 593 is connected to the negative electrode post 580. The top cover 599 is mounted on the side of the end cover 510 facing away from the lower insulating member 530, exposing the first conductive block 591, the second conductive block 593, and the communication hole 515 of the end cover 510.

[0045] During assembly of the end cap assembly 500, the lower insulator 530 and the end cap 510 are sequentially placed on the positive electrode post 570. The first upper insulator 550 and the first conductive block 591 are then placed, followed by the second upper insulator 560 and the second conductive block 593. The first conductive block 591 is press-fitted onto the first upper insulator 550 and the positive electrode post 570. The first conductive block 591 and the positive electrode post 570 are then riveted to ensure that the first conductive block 591 is secured to the end cap 510 before being welded to the positive electrode post 570. Finally, the first conductive block 591 and the positive electrode post 570 are welded together using front welding. The second conductive block 593 is pressed onto the second upper insulating member 560 and the negative electrode column 580, and then the second conductive block 593 and the negative electrode column 580 are riveted to ensure that the second conductive block 593 is fixed on the end cover 510 before being welded to the negative electrode column 580. Finally, the second conductive block 593 and the negative electrode column 580 are welded by front welding.

[0046] Continue reading Figure 3In the embodiment of the present application, the end cap assembly 500 further includes an electrical connector 700, which is electrically connected to both the positive electrode post 570 and the negative electrode post 580, and is used to electrically connect the battery cell 300, so as to achieve electrical connection between the end cap assembly 500 and the battery cell 300. Specifically, the electrical connector 700 includes a positive electrode connector 710 and a negative electrode connector 730. The positive electrode connector 710 is electrically connected between the positive electrode post 570 and the positive electrode tab 330 of the battery cell 300, and the negative electrode connector 730 is electrically connected between the negative electrode post 580 and the negative electrode tab 350 of the battery cell 300, so as to achieve electrical connection between the end cap assembly 500 and the battery cell 300.

[0047] See Figure 6 、 Figure 7 and Figure 8 , Figure 6 for Figure 3 The schematic structural diagram of the positive electrode connector 710 in the energy storage device 1000 is shown. Figure 7 for Figure 6 The structure diagram of the positive electrode connector 710 shown in another perspective is as follows: Figure 8 for Figure 7 Schematic diagram of the exploded structure of the positive electrode connector 710 is shown.

[0048] The positive electrode connector 710 includes a positive electrode connecting piece 30 and an insulating protective sleeve 60 . The insulating protective sleeve 60 is sleeved on the outer side of the positive electrode connecting piece 30 .

[0049] Specifically, the positive electrode connector 30 includes a first connector 31, a fuse 33, and a second connector 35. The fuse 33 is connected between the first connector 31 and the second connector 35. In this embodiment, the first connector 31, the fuse 33, and the second connector 35 are integrally formed. The first connector 31 is used to be fixedly connected to the positive electrode post 570, and the second connector 35 is used to be fixedly connected to the positive electrode tab 330. This allows the positive electrode connector 30 to be electrically connected between the positive electrode post 570 and the positive electrode tab 330, thereby electrically connecting the positive electrode connector 710 between the positive electrode post 570 and the battery cell 300.

[0050] Among them, the contact area between the positive electrode connecting piece 30 and the positive electrode column 570 is S1, that is, the contact area between the first connecting part 31 and the positive electrode column 570 is S1. In this embodiment, the first connecting part 31 is welded to the positive electrode column 570 to achieve electrical connection between the first connecting part 31 and the positive electrode column 570, and the contact area S1 is also the weld area between the first connecting part 31 and the positive electrode column 570. The first connecting part 31 is provided with a fixing hole 311, and the fixing hole 311 passes through the first connecting part 31 along the thickness direction of the first connecting part 31. There can be multiple fixing holes 311, and the multiple fixing holes 311 are arranged at intervals. In this embodiment, there are two fixing holes 311, and the two fixing holes 311 are arranged at intervals along the width direction of the positive electrode connecting piece 30.

[0051] 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. In the event of an external short circuit in the energy storage device 1000, the fuse portion 33 can fuse promptly, thereby disconnecting the external circuit of the energy storage device 1000 and stopping the short circuit, thereby avoiding the risk of fire and explosion in the energy storage device 1000 caused by an external short circuit. Specifically, in this embodiment, a thinning groove 301 is provided on the surface of the fuse portion 33. This groove 301 is formed by thinning the positive electrode connecting tab 30 at the location of the fuse portion 33 to achieve D3 < D1 and D3 < D2. At this point, at least one of the two surfaces of the fuse portion 33 along the thickness direction is recessed relative to the surfaces of the first connecting portion 31 and the second connecting portion 35. It is understandable that in other embodiments, other methods such as hollowing out part of the fuse part 33 can also be used to weaken the structural strength of the fuse part 33. The embodiment of the present application does not limit the formation method of the fuse part 33.

[0052] The fuse portion 33 is provided with a second notch 303. The opening of the second notch 303 is located on the end surface of the fuse portion 33 facing the second connecting portion 35, and the second notch 303 penetrates the fuse portion 33 along the thickness direction of the fuse portion 33. The second notch 303 is used to avoid the injection hole 535 and the injection diverter 503, thereby preventing the positive electrode connecting piece 30 from overlapping with the lower insulating member 530 and affecting the injection efficiency.

[0053] The second connection portion 35 is connected to the end of the fuse portion 33 facing away from the first connection portion 31, thereby connecting the fuse portion 33 between the first connection portion 31 and the second connection portion 35. The second connection portion 35 is provided with an escape space 331, which extends through the second connection portion 35 along its thickness. The escape space 331 is used to avoid the injection hole 535 and the injection diverter 503, thereby preventing the injection efficiency from being affected when the positive electrode connecting piece 30 and the lower insulating piece 530 overlap. In this embodiment, the second connection 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 facing away from the first connection portion 31, and are separated along the width of the positive electrode connecting piece 30 to form the escape space 331. The first connecting arm 351 and the second connecting arm 353 are both used to electrically connect to the positive electrode tab 330. In this embodiment, the second connecting portion 35 is connected to the positive electrode tab 330 by welding.

[0054] The insulating protective cover 60 is provided with a first notch 601 and a third notch 603. The openings of the first notch 601 and the openings of the third notch 603 are respectively located on two opposite end surfaces of the insulating protective cover 60 along the extension direction of the insulating protective cover 60, and the first notch 601 penetrates the insulating protective cover 60 along the thickness direction of the insulating protective cover 60. The first notch 601 does not penetrate the insulating protective cover 60 along the extension direction of the insulating protective cover 60, that is, along the X-axis. In this embodiment, along the extension direction of the insulating protective cover 60, the insulating protective cover 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 cover 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 the first notch 601 is located on the surface of the first portion 61 facing away from the second portion 63, and the first notch 601 penetrates the first portion 61 along the thickness direction of the first portion 61. In this embodiment, the first portion 61 includes a first insulating portion 611 and a second insulating portion 613 . The first insulating portion 611 and the second insulating portion 613 are disposed opposite to each other along the thickness direction of the first portion 61 .

[0055] The second portion 63 is connected to the side of the first portion 61 facing away from the first notch 601 and is provided with a third notch 603. The third notch 603 opens at the end of the second portion 63 facing away from the first portion 61 and extends through the thickness of the second portion 63. In this embodiment, the second portion 63 includes a connecting body 631 and a connecting protrusion 633. The connecting body 631 is connected to the side of the first portion 61 facing away from the first notch 601 and is provided with the third notch 603. The third notch 603 opens at the end of the connecting body 631 facing away from the first portion 61 and extends through the thickness of the connecting body 631. The connecting protrusion 633 protrudes from the connecting body 631. In this embodiment, there are two connecting protrusions 633, spaced apart from each other.

[0056] In the assembled structure of the positive electrode connector 710, the first portion 61 of the insulating protective sleeve 60 is positioned outside the fuse portion 33 of the positive electrode connecting tab 30, thereby securing the insulating protective sleeve 60 to the outer side of the fuse portion 33 and, consequently, the outer side of the positive electrode connecting tab 30. The first insulating portion 611 and the second insulating portion 613 of the first portion 61 respectively cover both surfaces of the fuse portion 33 along the thickness direction. The second portion 63 is fixedly connected to the first connecting portion 31 of the positive electrode connecting tab 30, with a portion of the outer surface of the first connecting portion 31 exposed relative to the third notch 603. The connecting body 631 of the second portion 63 is positioned outside the first connecting portion 31. Each connecting protrusion 633 is fixedly connected to the inner wall of a fixing hole 311 of the first connecting portion 31, securing the second portion 63 to the positive electrode connecting tab 30, and thus securing the insulating protective sleeve 60 to the positive electrode connecting tab 30, thereby enhancing the secure assembly between the positive electrode connecting tab 30 and the insulating protective sleeve 60. At this time, the opening of the first notch groove 601 faces the second connecting portion 35 of the positive electrode connecting tab 30 .

[0057] See also Figure 9 , Figure 9 for Figure 7 The figure shows a cross-sectional view of the positive electrode connector 710. Along the extension direction of the positive electrode connector 30 and toward the second connecting portion 35, the insulating protective cover 60 extends beyond the bottom wall of the second notch 303 in the fuse portion 33. Specifically, along the extension direction of the positive electrode connector 30 and toward the second connecting portion 35, the bottom wall of the first notch 601 in the insulating protective cover 60 extends beyond the bottom wall of the second notch 303.

[0058] In this embodiment, along the extension direction of the positive electrode connecting piece 30 and toward the second connecting portion 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 surface of the second connecting portion 35 facing away from the fuse portion 33 and the bottom wall of the second notch groove 303 is h2, and 0.10

[0059] See also Figure 3 、 Figure 10 and Figure 11 , Figure 10 for Figure 3 FIG. 1 is a schematic diagram of the assembly structure of the positive electrode connector 710 and the lower insulating member 530 in the energy storage device 1000. Figure 11 for Figure 10 ​A schematic cross-sectional view of the assembly structure shown. In the assembly structure of the end cap assembly 500 and the battery cell 300, the positive electrode connector 30 is electrically connected between the flange portion 507 of the positive electrode post 570 and the positive tab 330 of the battery cell 300. The positive electrode connector 30 covers the escape groove 537 of the lower insulating member 530, and the first insulating portion 611 of the insulating protective sleeve 60 is accommodated in the escape groove 537. Specifically, the first connecting portion 31 of the positive electrode connector 30 is fixedly connected to the positive electrode post 570, the second connecting portion 35 is fixedly connected to the positive tab 330 of the battery cell 300, and the fuse portion 33 is disposed corresponding to the escape groove 537. The injection hole 535 of the lower insulating member 530 is located within the projection of the escape space 331 of the second connecting portion 35 along the thickness direction of the lower insulating member 530. This allows the escape space 331 of the positive electrode connecting plate 30 to escape the injection hole 535 and the injection diverter 503 connected to the injection hole 535. The first insulating portion 611 of the first portion 61 of the insulating protective cover 60 is located on the side of the fuse 33 facing the escape groove 537, covers the surface of the fuse 33 facing the escape groove 537, and is accommodated in the escape groove 537. The second insulating portion 613 is located on the side of the fuse 33 facing away from the escape groove 537 and covers the surface of the fuse 33 facing away from the escape groove 537.

[0060] See Figure 12 , Figure 12 for Figure 11 The schematic diagram of the structure of section A in the cross-sectional structure shown. The width of the first insulating portion 611 of the first portion 61 of the insulating protective sleeve 60 is W1, and the width of the avoidance groove 537 along the extension direction of the lower insulating member 530 is W2, where W2>W1, to ensure that the first insulating portion 611 covering the fuse portion 33 is located within the avoidance groove 537, thereby ensuring that the first insulating portion 611 is accommodated within the avoidance groove 537. At this time, the opening of the first notch 601 and the opening of the second notch 303 are both oriented toward the injection hole 535 of the lower insulating member 530, so that the first notch 601 and the second notch 303 avoid the injection hole 535, thereby preventing the positive electrode connecting piece 30 and the insulating protective sleeve 60 from affecting the injection efficiency of the energy storage device 1000 when overlapping with the lower insulating member 530. In particular, along the extension direction of the positive electrode connecting tab 30 and toward the liquid injection hole 535, the bottom wall of the first notch 601 in the insulating protective cover 60 extends beyond the bottom wall of the second notch 303 in the fuse portion 33, thereby ensuring that the insulating protective cover 60 extends beyond the bottom wall of the second notch 303 in the fuse portion 33 along the extension direction of the positive electrode connecting tab 30 and toward the liquid injection hole 535. 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 toward 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.

[0061] See also Figure 10 and Figure 12 The portion of the surface of the first connecting portion 31 in the positive electrode connecting piece 30 that faces away from the lower insulating member 530 is exposed relative to the third notch groove 603, which facilitates welding the first connecting portion 31 to the positive electrode column 570 through the third notch groove 603, thereby facilitating increasing the welding area of the first connecting portion 31. The first insulating portion 611 of the first part 61 in the insulating protective cover 60 is accommodated in the avoidance groove 537, that is, the edge of the first insulating portion 611 along the width direction is located between the first groove edge line 11 and the second groove edge line 13 of the avoidance groove 537. The second insulating portion 613 of the first part 61 protrudes relative to the lower insulating member 530 toward the battery cell 300. 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 avoidance groove 537, or can be spaced apart from the bottom wall of the avoidance groove 537. This is not limited in the present application. The height of the second insulating portion 613 protruding from the second surface 543 of the lower insulating member 530 is less than the height of the positive electrode post 570 protruding from the second surface 543. In this embodiment, the thickness of the insulating protective cover 60 is H1, the depth of the avoidance groove 537 is H2, and the height of the positive electrode post 570 protruding from the second surface 543 of the lower insulating member 530 is h, where H1-H2≤h.

[0062] 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 column 580 and the negative electrode ear 350, so as to realize the electrical connection between the negative electrode connecting piece 730 and the negative electrode ear 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 fuse portion 33, and a second connecting portion 35. For details, please refer to the structure of the above-mentioned positive electrode connecting piece 30, which will not be repeated here. Among them, the electrical conductivity of the positive electrode connecting piece 30 is less than the electrical conductivity 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.

[0063] In this embodiment, the contact area between the negative electrode connecting tab 730 and the negative electrode post 580 is S2, that is, the weld area between the negative electrode connecting tab 730 and the negative electrode post 580 is S2. The contact area S1 between the positive electrode connecting tab 30 and the positive electrode post 570 is greater than the contact area S2 between the negative electrode connecting tab 730 and the negative electrode post 580. In this embodiment, the thickness of the fuse portion 33 of the positive electrode connecting tab 30 is less than the thickness of the fuse portion 33 of the negative electrode connecting tab 730. The width of the fuse portion 33 of the positive electrode connecting tab 30 along the extension direction of the positive electrode connecting tab 30 is greater than the width of the fuse portion 33 of the negative electrode connecting tab 730 along the extension direction of the negative electrode connecting tab 730.

[0064] In the end cap assembly 500 provided in the embodiment of the present application, by providing the positive electrode connector 30 with a fuse portion 33, the fuse portion 33 of the positive electrode connector 30 is promptly blown when a short circuit occurs in the external circuit of the energy storage device 1000, thereby disconnecting the external circuit of the energy storage device 1000 and stopping the short circuit, thereby avoiding the risk of fire and explosion of the energy storage device 1000 due to an external short circuit. In addition, by providing an insulating protective sleeve 60 outside the fuse portion 33, the supporting strength of the positive electrode connector 30 is enhanced, and the positive electrode connector 30 is prevented from being able to overlap after melting. This prevents the small arc generated by the overlapping of the positive electrode connector 30 after melting, which may ignite the electrolyte and flammable gases (hydrogen, alkanes, carbon monoxide, etc.) generated by the external circuit short circuit, thereby causing fire and explosion.

[0065] Furthermore, by providing a relief groove 537 on the lower insulating member 530, when assembling the lower insulating member 530 and the positive electrode connecting tab 30, the relief groove 537 can be used to position the positive electrode connecting tab 30, thereby preventing the lower insulating member 530 and the positive electrode connecting tab 30 from being skewed during assembly, thereby ensuring that the positive electrode connecting tab 30 and the positive tab 330 are properly assembled and preventing problems with poor connection between the positive electrode connecting tab 30 and the positive tab 330. Furthermore, by utilizing the relief groove 537 to avoid the protruding portion of the insulating protective cover 60 relative to the positive electrode connecting tab 30, the overall thickness of the positive electrode connecting tab 30 is avoided by adding the insulating protective cover 60, thereby preventing the thickness of the insulating protective cover 60 from causing poor adhesion between the positive electrode connecting tab 30 and the flange portion 507 of the positive electrode post 570, thereby preventing problems such as poor welding between the positive electrode connecting tab 30 and the flange portion 507 of the positive electrode post 570. This ensures a good welding quality between the positive electrode connecting tab 30 and the positive electrode post 570. On the one hand, the escape groove 537 reserves 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 absorbs most of the heat and further prevents heat from spreading. This makes it less likely that the insulating protective sleeve 60 will burn the lower insulating member 530 during the heating process, reducing the probability of structural deformation of the lower insulating member 530. On the other hand, the first insulating portion 611 of the insulating protective sleeve 60 is accommodated within the escape groove 537, ensuring that the thickness of the melting portion 33 of the positive electrode connector 30 is equal to the thickness of the second connecting portion 35 of the positive electrode connector 30 connected to the positive electrode tab 330, thereby preventing the second connecting portion 35 of the positive electrode connector 30 connected to the positive electrode tab 330 from warping.

[0066] In addition, by accommodating the first insulating portion 611 of the insulating protective cover 60 using the avoidance groove 537, the problem of the insulating protective cover 60 occupying the electrolyte filling space when the avoidance groove 537 is not provided can be avoided, thereby ensuring the electrolyte filling amount, thereby facilitating improving the energy density of the assembled energy storage device 1000.

[0067] In addition, due to the thickness of the insulating protective cover 60, when the insulating protective cover 60 abuts against the lower insulating member 530, there may be a gap between the positive connecting piece 30 and the bottom surface of the flange portion 507 of the positive electrode column 570, which may cause poor welding between the positive connecting piece 30 and the positive electrode column 570. In the embodiment of the present application, the thickness H1 of the insulating protective cover 60, the depth H2 of the avoidance groove 537 and the protruding height of the positive electrode column 570 relative to the lower insulating member 530 are designed to meet the following requirements: H1-H2≤h, which is conducive to the fitting of the positive connecting piece 30 and the positive electrode column 570, thereby ensuring the welding yield between the positive connecting piece 30 and the positive electrode column 570.

[0068] In addition, by setting the bottom wall of the first notch groove 601 in the insulating protective cover 60 to extend beyond the bottom wall of the second notch groove 303, the portion of the insulating protective cover 60 that extends beyond the bottom wall of the second notch groove 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 groove 601 and the bottom wall of the second notch groove 303 and the distance h2 between the end face of the second connecting portion 35 away from the fuse portion 33 and the bottom wall of the second notch groove 303 to satisfy: 0.10

[0069] In addition, since the electrical conductivity of the positive electrode connecting piece 30 is lower than that of the negative electrode connecting piece 730, the current conducting capacity of the positive electrode connecting piece 30 is lower than that of the negative electrode connecting piece 730. By setting the contact area S1 between the positive electrode connecting piece 30 and the positive electrode column 570 to be greater than the contact area S2 between the negative electrode connecting piece 730 and the negative electrode column 580, the current conducting area of the positive electrode connecting piece 30 is increased by increasing the contact area S1 between the positive electrode connecting piece 30 and the positive electrode column 570, thereby facilitating the positive electrode connecting piece 30 and the negative electrode connecting piece 730 to have the same current conducting efficiency, and further facilitating the consistency of the positive and negative electrode fusing.

[0070] ​However, the thermal conductivity of the negative electrode connecting piece 730 (copper in this embodiment) is better than that of the positive electrode connecting piece 30 (aluminum in this embodiment). In order to balance the relationship between conduction and thermal conductivity, the positive electrode connecting piece 30 and the negative electrode connecting piece 730 can be at the same temperature level, thereby ensuring that the positive electrode connecting piece 30 and the negative electrode connecting piece 730 are melted at the same time. In this embodiment of the application, the thickness of the melting portion 33 of the positive electrode connecting piece 30 is set to be less than the thickness of the melting portion 33 of the negative electrode connecting piece 730, and / or the width of the melting portion 33 of the positive electrode connecting piece 30 is set to be greater than the thickness of the melting portion 33 of the negative electrode connecting piece 730. The width of the fuse portion 33 of the positive electrode connecting tab 30 is 0, making the fuse portion 33 of the positive electrode connecting tab 30 thinner or wider than the fuse portion 33 of the negative electrode connecting tab 730, making it easier to fuse. At the same time, the insulating protective sleeve 60 is placed outside the fuse portion 33 of the positive electrode connecting tab 30, ensuring the safe and equal positioning of the energy storage device 1000 on both the positive and negative sides. While ensuring that the positive electrode connecting tab 30 has a larger flow conducting area, it also improves the temperature rise capability of the fuse portion 33 of the positive electrode connecting tab 30, facilitating early warning of safety issues in the energy storage device 1000. The insulating protective sleeve 60 also improves the structural strength of the fuse portion 33, thereby achieving a balance between the structural strength, flow conducting area, and safe fusing of the positive electrode connecting tab 30.

[0071] An embodiment of the present application further 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.

[0072] See Figure 13 , Figure 13 Schematic diagram of the assembly process of the energy storage device 1000 provided in an embodiment of the present application.

[0073] The present embodiment further provides an assembly method of the energy storage device 1000, including: S10, assemble the battery cell 300, the positive electrode connecting piece 30 and the insulating protective cover 60 to obtain an intermediate component, the battery cell 300 includes a positive electrode ear 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 column 570, the second connecting part 35 is spaced apart from the first connecting part 31, and the second connecting part 35 is fixedly connected to the positive electrode ear 330 of the battery cell 300, the insulating protective cover 60 includes a first insulating part 611, and the first insulating part 611 covers the fuse part 33.

[0074] In this embodiment, the positive electrode connecting piece 30 and the insulating protective cover 60 are first assembled to form a positive electrode connector 710, and then the second connecting portion 35 of the positive electrode connecting piece 30 in the positive electrode connector 710 is welded to the positive electrode ear 330 to achieve electrical connection between the positive electrode connecting piece 30 and the positive electrode ear 330, thereby achieving electrical connection between the positive electrode connector 710 and the battery cell 300.

[0075] S20. Provide a lower insulating member 530 and a positive electrode column 570. 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 column through hole 531 and an avoidance groove 537. The positive electrode column through hole 531 passes through the first surface 541 and the second surface 543. The avoidance groove 537 is located on one side of the positive electrode column through hole 531 and is spaced apart from the positive electrode column through hole 531. The opening of the avoidance groove 537 is located on the second surface 543. The positive electrode column 570 is passed through the positive electrode column through hole 531.

[0076] In the embodiment of the present application, step S10 and step S20 can be swapped.

[0077] S30 , placing the intermediate assembly on the side of the lower insulating member 530 where the avoidance 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 , and the first insulating portion 611 is accommodated in the avoidance groove 537 .

[0078] The intermediate component can be moved manually or automatically to move the insulating protective cover 60. In this embodiment, a detection module is used to detect the position of the avoidance groove 537 and the position of the insulating protective cover 60, and the first insulating portion 611 is adjusted to be accommodated in the avoidance groove 537 based on the detection results of the detection module.

[0079] Specifically, the detection module has an identification area, and the first groove edge line 11 and the second groove edge line 13 of the avoidance groove 537 are both located within the identification area. When the detection module detects that the insulating protective cover 60 is within the identification area and the outline of the first insulating portion 611 overlaps with the first groove edge line 11 or the second groove edge line 13, the insulating protective cover 60 is moved. The avoidance groove 537 provides a location for the detection module's identification area. The detection module's identification area 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 fully identify the avoidance groove 537.

[0080] Exemplarily, the detection module is a CCD visual inspection device, i.e., a visual inspection device that utilizes a charge-coupled device (CCD) as an image sensor. The CCD visual inspection device simultaneously identifies the first groove edge 11 and the second groove edge 13 of the avoidance groove 537, enabling the CCD visual inspection device to fully identify the avoidance groove 537. The CCD visual inspection device then identifies the placement of the insulating protective cover 60 based on laser reflections at the locations of the first groove edge 11 and the second groove edge 13. When the CCD visual inspection device detects that the insulating protective cover 60 is within the identification area and the widthwise contour of the first insulating portion 611 of the first portion 61 of the insulating protective cover 60 overlaps with the first groove edge 11 or the second groove edge 13, this indicates that the first insulating portion 611 of the first portion 61 obscures the first groove edge 11 or the second groove edge 13, and the first insulating portion 611 is determined to be outside the avoidance groove 537. Then move the insulating protective cover 60 until the width direction contour line of the first insulating part 611 in the insulating protective cover 60 does not overlap with the first groove edge line 11 and the second groove edge line 13, that is, the CCD visual inspection equipment can simultaneously identify the complete first groove edge line 11, the second groove edge line 13 and the first insulating part 611. At this time, it can be determined that the first insulating part 611 has moved into the avoidance groove 537.

[0081] In the assembly method of the energy storage device 1000 provided in the embodiment of the present application, during the assembly of the positive electrode connector 710 and the lower insulating member 530, the first insulating portion 611 of the insulating protective cover 60 is adjusted to be located within the avoidance groove 537, thereby preventing the positive electrode connector 30 from being tilted, thereby avoiding the problem of poor connection between the positive electrode connector 30 and the positive electrode tab 330, and preventing the positive electrode connector 30 from interfering with the injection of liquid into the injection hole 535 of the energy storage device 1000.

[0082] Furthermore, by providing the detection module with 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 portion 611 of the insulating protective cover 60 overlaps with the first groove edge line 11 or the second groove edge line 13 to determine whether the insulating protective cover 60 is located within the avoidance groove 537. The position of the insulating protective cover 60 is then adjusted based on the detection module's detection results, thereby preventing the positive electrode connecting tab 30 from being misaligned and thus preventing the positive electrode connecting tab 30 from interfering with liquid injection from the liquid injection hole 535 of the energy storage device 1000.

[0083] The above disclosure is only a preferred embodiment of the present application, and it is certainly not intended to limit the scope of the rights of the present application. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. An end cap assembly, characterized in that: The end cap assembly comprises: a lower insulating member, the lower insulating member having a first surface and a second surface, the first surface and the second surface being arranged opposite to each other along the thickness direction of the lower insulating member, the lower insulating member being provided with a positive electrode through-hole and an avoidance groove, the positive electrode through-hole passing through the first surface and the second surface, the avoidance groove being located on one side of the positive electrode through-hole and spaced apart from the positive electrode through-hole, and the opening of the avoidance groove being provided on the second surface; A positive electrode column, the positive electrode column being passed through the positive electrode column through hole; a positive electrode connecting piece, the positive electrode connecting piece being located on a side of the second surface facing away from the first surface, the positive electrode connecting piece comprising a first connecting portion, a second connecting portion, and a fuse portion, the first connecting portion being fixedly connected to the positive electrode column, the second connecting portion being spaced apart from the first connecting portion and being configured to be fixedly connected to the positive electrode tab, the fuse portion being connected between the first connecting portion and the second connecting portion and being disposed corresponding to the avoidance groove; and an insulating protective sleeve, wherein the insulating protective sleeve includes a first insulating portion, the first insulating portion is located on a side of the fuse portion facing the avoidance groove, covers the fuse portion, and is accommodated in the avoidance groove.

2. The end cap assembly according to claim 1, wherein: The thickness of the insulating protective sleeve is H1, the depth of the avoidance groove is H2, the height of the positive electrode column protruding relative to the second surface is h, and H1-H2≤h.

3. The end cap assembly according to claim 1, wherein: The insulating protective cover includes a first part and a second part connected to the first part, the first part includes the first insulating portion, 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 avoidance groove along the extension direction of the lower insulating member is W2, W2>W1.

4. The end cap assembly according to claim 3, wherein: The first portion is sleeved on the outer side of the fuse part. The first portion further includes a second insulating portion. The second insulating portion is located on a side of the fuse part away from the avoidance groove and covers the fuse part.

5. The end cap assembly according to any one of claims 1 to 4, characterized in that: The lower insulating member is provided with a liquid injection hole, which passes through the lower insulating member. Along the extension direction of the lower insulating member, the avoidance groove is located between the positive electrode column through hole and the liquid injection hole.

6. The end cap assembly according to claim 5, wherein: The second connecting portion is provided with an avoidance space, which passes through the second connecting portion along the thickness direction of the second connecting portion. The injection hole is located within the projection of the avoidance space on the thickness direction of the lower insulating member. The insulating protective cover is provided with a first notch groove, which passes through the insulating protective cover, and the opening of the first notch groove faces the injection hole.

7. The end cap assembly according to claim 6, characterized in that: The fuse part is provided with a second notch groove, the opening of the second notch groove is provided on the end surface of the fuse part facing the second connecting part, and the second notch groove penetrates the fuse part along the thickness direction of the fuse part, along the extension direction of the positive electrode connecting piece and toward the direction of the injection hole, and the bottom wall of the first notch groove exceeds the bottom wall of the second notch groove.

8. The end cap assembly according to claim 7, wherein: Along the extension 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 surface of the second connecting portion facing away from the fuse portion and the bottom wall of the second notch groove is h2, 0.10<h1 / h2<0.

24.

9. The end cap assembly according to claim 7, wherein: The thickness of the first connecting portion is D1, the thickness of the second connecting portion is D2, and the thickness of the fuse portion is D3, where D3 satisfies: D3<D1, and D3<D2.

10. An energy storage device, characterized in that: The energy storage device includes a battery cell and the end cap assembly according to any one of claims 1 to 9, and the second connecting portion is fixedly connected to the positive electrode tab of the battery cell.

11. The energy storage device according to claim 10, characterized in that The battery cell further includes a negative electrode tab, the lower insulating member further includes a negative electrode column through-hole, the avoidance groove is located between the positive electrode column through-hole and the negative electrode column through-hole, the energy storage device further includes a negative electrode column and a negative electrode connecting piece, the negative electrode column is passed through the negative electrode column through-hole, and the negative electrode connecting piece is connected between the negative electrode column and the negative electrode tab; The contact area between the positive electrode connecting piece and the positive electrode column is S1, and the contact area between the negative electrode connecting piece and the negative electrode column is S2, where S1>S2.

12. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to claim 10 or 11, and the energy storage device is used to supply power to the electrical equipment.

Images