Connecting components, end cover components and energy storage devices

Abstract

The present application provides a connection assembly, an end cover assembly and an energy storage device, wherein the connection assembly is used to connect between a first pole and a first pole lug, the connection assembly includes a first connection piece and an insulating protective sleeve, the first connection piece includes a first connection part, a second connection part and a first fuse part, the first connection part is used to be fixedly connected to the first pole, the second connection part is spaced apart from the first connection part and is used to be fixedly connected to the first pole lug, the first fuse part is connected between the first connection part and the second connection part, and the insulating protective sleeve covers the first fuse part; wherein the second connection part is provided with an avoidance space, the avoidance space passes through the second connection part, the surface of the first fuse part facing the second connection part is exposed relative to the avoidance space, and along the direction from the first connection part to the second connection part, the insulating protective sleeve at least partially exceeds the first fuse part.

Description

Technical Field

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

[0002] Current energy storage batteries, such as square hard-shell batteries, typically have a connector between the tab and the post. The primary function of the connector is to transfer current between the post and the tab. Batteries present 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 breaking the battery's external circuit and preventing the short circuit. However, the structural strength of these connectors is relatively low, particularly after the inclusion of a fuse. This further reduces the strength of these connectors, and when the weight of the battery cell to which they are welded is excessive, the connectors can easily deform under the weight. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a connection assembly, an end cover assembly and an energy storage device, wherein the connection assembly has good structural strength at the position of the fuse part of the connection piece, thereby solving the problem that the connection piece is easily deformed under weight.

[0004] An embodiment of the present application provides a connection assembly, which is used to connect between a first pole and a first tab. The connection assembly includes a first connection piece and an insulating protective sleeve. The first connection piece includes a first connection portion, a second connection portion, and a first fuse portion. The first connection portion is used to be fixedly connected to the first pole. The second connection portion is spaced apart from the first connection portion and is used to be fixedly connected to the first tab. The first fuse portion is connected between the first connection portion and the second connection portion. The insulating protective sleeve covers the fuse portion.

[0005] Among them, the second connection part is provided with an avoidance space, the avoidance space runs through the second connection part, the surface of the first fuse part facing the second connection part is exposed relative to the avoidance space, and along the direction from the first connection part toward the second connection part, the insulating protective cover at least partially exceeds the first fuse part.

[0006] In the connection assembly provided in the embodiments of the present application, the first connecting piece includes a first fuse. When a short circuit occurs in the external circuit of the energy storage device, the first fuse of the first connecting piece promptly blows, disconnecting the external circuit of the energy storage device and stopping the short circuit. This avoids the risk of fire and explosion in the energy storage device caused by an external short circuit. Furthermore, by covering the outer surface of the first fuse with an insulating protective sleeve, the first connecting piece can be prevented from remaining connected after melting. This prevents the small arc generated by the overlapping connection of the first connecting piece after melting from igniting the electrolyte and flammable gases (hydrogen, alkanes, carbon monoxide, etc.) generated by the external circuit short circuit, thereby preventing the risk of fire and explosion.

[0007] In addition, due to the insufficient structural strength of the first fuse part in the first connecting piece, the first fuse part is easily bent, causing the second connecting part to tilt. By providing an insulating protective cover to cover the first fuse part, the structural strength of the first connecting piece at the position of the first fuse part can be enhanced, thereby solving the problem of the first connecting piece being easily deformed under weight. In addition, in an embodiment of the present application, by providing an insulating protective cover that at least partially extends beyond the first fuse part in the direction from the first connecting part toward the second connecting part, the portion of the insulating protective cover that extends beyond the first fuse part can increase the torque in the area of ​​the first fuse part and reduce the torque from the first connecting piece to the first pole ear to the area of ​​the first fuse part, thereby ensuring the structural strength of the connecting assembly at the first fuse part and preventing abnormal fracture of the first fuse part of the first connecting piece during vibration of the energy storage device.

[0008] In one possible embodiment, the insulating protective sleeve is provided with a first notch groove, the opening of the first notch groove faces the second connecting portion, and the first notch groove penetrates the insulating protective sleeve along the thickness direction of the insulating protective sleeve, and the bottom wall of the first notch groove exceeds the first fuse portion along the direction from the first connecting portion to the second connecting portion. By providing the first notch groove, the first notch groove can be used as a buffer for the injection hole of the lower insulating member, thereby avoiding affecting the injection efficiency of the energy storage device when the connecting assembly overlaps the lower insulating member. At this time, by providing the bottom wall of the first notch groove beyond the first fuse portion, the insulating protective sleeve is at least partially beyond the first fuse portion, thereby ensuring the structural strength of the connecting assembly at the first fuse portion and avoiding abnormal breakage of the first connecting piece during vibration of the energy storage device.

[0009] In one possible embodiment, the first fuse part is provided with a second notch, the opening of the second notch is toward the second connection part, and is connected to the avoidance space. Along the extension direction of the connecting piece and in the direction toward the second connection part, the bottom wall of the first notch exceeds the bottom wall of the second notch. By providing the second notch in the first fuse, the second notch can avoid the injection hole and the injection diverter, thereby avoiding affecting the injection efficiency of the energy storage device. At this time, by providing the bottom wall of the first notch beyond the bottom wall of the second notch, the insulating protective cover is at least partially beyond the first fuse, thereby ensuring the structural strength of the connection assembly at the first fuse, and avoiding abnormal fracture of the first connection piece during vibration of the energy storage device.

[0010] In a possible embodiment, along the extension direction of the first 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

[0011] In a possible embodiment, the insulating protective cover includes a first part and a second part connected to the first part, the first part covers the first fuse part, the second part is fixedly connected to the first connecting part and covers part of the first connecting part, thereby realizing a fixed connection between the insulating protective cover and the first connecting piece, and improving the firmness of the assembly between the first connecting piece and the insulating protective cover.

[0012] In one 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 first fuse portion is D3, where D3 satisfies: D3 < D1, and D3 < D2, so that the structural strength of the first fuse portion is less than the structural strength of the first connecting portion and less than the structural strength of the second connecting portion. When an external short circuit occurs in the energy storage device, the first fuse portion can be melted in time, 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 the external short circuit.

[0013] An embodiment of the present application also provides an end cap assembly, which includes a lower insulating member, a first pole and the above-mentioned connecting assembly. The lower insulating member is provided with a first through hole and an injection hole. The first through hole and the injection hole both pass through the lower insulating member and are spaced apart from each other. The first pole is passed through the first through hole. The connecting assembly is located on one side in the thickness direction of the lower insulating member. The first connecting portion is fixedly connected to the first pole. The projection of the injection hole on the first connecting plate is located within the avoidance space.

[0014] In the end cover assembly provided in the embodiment of the present application, on the one hand, the insulating protective sleeve in the connecting assembly can enhance the structural strength of the first connecting piece at the position of the first fuse part, thereby solving the problem that the first connecting piece is easily deformed under weight; on the other hand, the projection of the injection hole on the first connecting piece is arranged to be located within the avoidance space, so that the first connecting piece avoids the injection hole, thereby avoiding the overlap of the connecting assembly and the lower insulating part affecting the injection efficiency.

[0015] ​In one possible embodiment, the lower insulating member is provided with a second through hole, the second through hole passes through the lower insulating member, the injection hole is located between the first through hole and the second through hole, the end cap assembly further includes a second pole, the second pole is provided through the second through hole, the end cap assembly further includes a second connecting piece, the second connecting piece and the connecting assembly are located on the same side in the thickness direction of the lower insulating member, the second connecting piece is fixedly connected to the second pole, and is used to connect to the second tab;

[0016] Among them, the contact area between the first connecting piece and the first pole is S1, the contact area between the second connecting piece and the second pole is S2, S1>S2, so as to increase the contact area S1 between the first connecting piece and the first pole to increase the conduction area of ​​the first connecting piece, thereby facilitating the first connecting piece and the second connecting piece to have the same conduction efficiency, and further facilitating the consistency of the positive and negative pole fusing.

[0017] In a possible embodiment, the second connecting piece includes a third connecting portion, a fourth connecting portion, and a second fuse portion, the third connecting portion is fixedly connected to the second pole, and the second fuse portion is connected between the third connecting portion and the fourth connecting portion;

[0018] The thickness of the first fuse portion is less than the thickness of the second fuse portion, and / or the width of the first fuse portion along the extension direction of the first connecting piece is greater than the width of the second fuse portion along the extension direction of the second connecting piece. In order to balance the relationship between flow conduction and heat conduction, the first fuse portion of the first connecting piece is made thinner and / or wider, and the thickness of the first fuse portion of the first connecting piece is set to be less than the thickness of the second fuse portion of the second connecting piece, and / or the width of the first fuse portion is set to be greater than the width of the second fuse portion. While ensuring that the first connecting piece has a larger flow conduction area, the temperature rise capacity of the first fuse portion of the first connecting piece is improved, which is conducive to early warning of safety issues of the energy storage device. At the same time, an insulating protective sleeve is provided on the outside of the first fuse portion of the first connecting piece. The insulating protective sleeve has the effect of improving the structural strength of the first fuse portion, thereby achieving a balance between the structural strength of the first connecting piece, the flow conduction area and the safety fuse.

[0019] An embodiment of the present application further provides an energy storage device, which includes a battery cell and an end cap assembly as described above, wherein the battery cell includes a first electrode tab, and the second connecting portion is fixedly connected to the first electrode tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] 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;

[0022] Figure 2 A schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0023] Figure 3 for Figure 2 A schematic diagram of an exploded structure of part of the structure of the energy storage device shown;

[0024] 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;

[0025] Figure 5 for Figure 4 A schematic structural diagram of the lower insulating member in the end cap assembly shown in another perspective;

[0026] Figure 6 for Figure 3 A schematic diagram of the structure of the connection components in the energy storage device shown;

[0027] Figure 7 for Figure 6 A schematic diagram of the structure of the connection component shown in another perspective;

[0028] Figure 8 for Figure 7 A schematic diagram of the exploded structure of the connected components shown;

[0029] Figure 9 for Figure 7 A schematic cross-sectional view of the connecting assembly shown;

[0030] Figure 10 for Figure 3 A schematic diagram of the assembly structure of the connecting component and the lower insulating member in the energy storage device shown;

[0031] Figure 11 for Figure 10 A schematic diagram of the cross-sectional structure of the assembly structure shown;

[0032] Figure 12 for Figure 11 A schematic diagram of the structure of part A in the cross-sectional structure shown;

[0033] Figure 13 Schematic diagram of the assembly process of the energy storage device provided in an embodiment of the present application.

[0034] 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, first tab; 350, second 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, first through hole; 533, second through hole; 535, liquid injection hole; 537, avoidance groove; 11, first groove edge; 13, second groove edge; 501, lower insulator body; 503, liquid injection diverter; 550, first upper insulator; 551, first accommodating groove; 560, second upper insulator; 561, second accommodating groove; 570, first pole; 580, second pole; 505, main body; 507, flange; 591, first conductive block; 593, second conductive block; 599, top cover; 700, electrical connector; 710 , connecting component; 730, second connecting piece; 30, first connecting piece; 31, first connecting part; 311, fixing hole; 33, first fuse part; 301, thinning groove; 303, second notch groove; 35, second connecting part; 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 part; 613, second insulating part, 63, second part; 631, connecting body; 633, connecting protrusion. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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:

[0038] (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.

[0039] (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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] See also Figure 2 and Figure 3 , Figure 2This 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The battery cell 300 is installed in the accommodating cavity of the housing 100 so that the battery cell 300 is installed on the inner side of the housing 100. The battery cell 300 includes a bare battery cell 310, a first electrode tab 330, and a second electrode tab 350. The bare battery cell 310 is wound with a material including a positive electrode sheet, a negative electrode sheet, and a separator. The separator is provided between the positive electrode sheet and the negative electrode sheet. In this embodiment, the first electrode tab 330 is a positive electrode tab, and the first electrode tab 330 is electrically connected to the positive electrode sheet. The second electrode tab 350 is a negative electrode tab, and the second electrode tab 350 is electrically connected to the negative electrode sheet.

[0049] 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 3The 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 first pole 570, a second pole 580, a first conductive block 591, a second conductive block 593, and a top cover 599. The first pole 570 is used to electrically connect to the first tab 330, and the second pole 580 is used to electrically connect to the second tab 350, thereby achieving electrical connection between the end cap assembly 500 and the battery cell 300.

[0050] 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.

[0051] See also Figure 5 , Figure 5 for Figure 4 The diagram shows the structure of the lower insulating member 530 in the end cap assembly 500 from another perspective. The lower insulating member 530 is mounted 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 first through hole 531, a second through hole 533, a liquid injection hole 535 and an avoidance groove 537. The first through hole 531, the second through hole 533 and the liquid injection hole 535 pass through the first surface 541 and the second surface 543, so that the first through hole 531, the second through hole 533 and the liquid injection hole 535 pass through the lower insulating member 530. The first through hole 531 and the second through hole 533 are located on opposite sides of the lower insulating member 530 along the extension direction. In this embodiment, the extension direction of the lower insulating member 530 is 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 first through hole 531 and the second through hole 533, and the injection hole 535 is connected between the connecting hole 515 of the end cover 510 and the accommodating cavity of the shell 100, so as to realize the injection of electrolyte into the accommodating cavity through the connecting hole 515 via the injection hole 535.

[0052] The escape groove 537 is located on one side of the first through hole 531 and is spaced apart from the first 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 first through hole 531 and the second through hole 533. In the extension direction of the lower insulating member 530, that is, along the X-axis direction, the escape groove 537 is located between the first 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 penetrates the lower insulating member 530 along the width direction of the lower insulating member 530, that is, 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, that is, along the X-axis direction. 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.

[0053] 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 first through hole 531, a second 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 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 shell 100.

[0054] 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.

[0055] The first pole 570 and the second pole 580 are both inserted through the lower insulator 530, the end cap 510, and the first upper insulator 550. The first pole 570 is sequentially inserted through the first through-hole 531 of the lower insulator 530, the first mounting hole 511 of the end cap 510, and the first through-hole of the first upper insulator 550, and the first pole 570 protrudes relative to the second surface 543. In this embodiment, the first upper insulator 550 is located between the end cap 510 and the first pole 570, and is used to insulate and isolate the end cap 510 and the first pole 570. The second pole 580 is sequentially inserted through the second through-hole 533 of the lower insulator 530, the second mounting hole 513 of the end cap 510, and the second through-hole of the second upper insulator 560. In this embodiment, the second upper insulator 560 is located between the end cap 510 and the second pole 580, and is used to insulate and isolate the end cap 510 and the second pole 580. In this embodiment, the first pole 570 is a first pole, and the second pole 580 is a negative pole.

[0056] The first and second poles 570 and 580 each 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 first pole 570 is located within the first through-hole 531, the first mounting hole 511, and the first through-hole. The flange 507 of the first pole 570 protrudes relative to the surface of the lower insulator 530 toward the battery cell 300. The main body 505 of the second pole 580 is located within the second through-hole 533, the second mounting hole 513, and the second through-hole. The flange 507 of the second pole 580 protrudes relative to the surface of the lower insulator 530 toward the battery cell 300.

[0057] 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 first pole 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 second pole 580. In this embodiment, the first conductive block 591 is riveted to the first pole 570, and the second conductive block 593 is riveted to the second pole 580. The top cover 599 is mounted on the side of the end cap 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 cap 510.

[0058] During assembly of the end cap assembly 500, the lower insulator 530 and the end cap 510 are sequentially placed onto the first pole 570. The first upper insulator 550 and the first conductive block 591 are then sequentially 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 first pole 570. The first conductive block 591 is then riveted to the first pole 570 to ensure that it is secured to the end cap 510 before being welded to the first pole 570. Finally, the first conductive block 591 is welded to the first pole 570 using front welding. The second conductive block 593 is pressed onto the second upper insulating member 560 and the second pole 580, and then the second conductive block 593 and the second pole 580 are riveted to ensure that the second conductive block 593 is fixed on the end cover 510 before being welded to the second pole 580. Finally, the second conductive block 593 and the second pole 580 are welded by front welding.

[0059] Continue reading Figure 3 In the embodiment of the present application, the end cap assembly 500 further includes an electrical connector 700, which is electrically connected to both the first pole 570 and the second pole 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 connecting assembly 710 and a second connecting piece 730. The connecting assembly 710 is located on one side of the lower insulating member 530 along the thickness direction, and the connecting assembly 710 is electrically connected between the first pole 570 and the first pole tab 330 of the battery cell 300. The second connecting piece 730 and the connecting assembly 710 are located on the same side of the lower insulating member 530, and the second connecting piece 730 is electrically connected between the second pole 580 and the second pole tab 350 of the battery cell 300, so as to achieve electrical connection between the end cap assembly 500 and the battery cell 300.

[0060] See Figure 6 、 Figure 7 and Figure 8 , Figure 6 for Figure 3 The schematic structural diagram of the connecting component 710 in the energy storage device 1000 is shown. Figure 7 for Figure 6 The structural diagram of the connecting component 710 shown in another perspective is as follows: Figure 8 for Figure 7 A schematic diagram of the exploded structure of the connection component 710 is shown.

[0061] The connection assembly 710 includes a first connection piece 30 and an insulating protective sleeve 60. The insulating protective sleeve 60 is sleeved on the outer side of the first connection piece 30. In this embodiment, the first connection piece 30 is the first connection piece, and the second connection piece 730 is the negative electrode connection piece.

[0062] Specifically, the first connecting piece 30 includes a first connecting portion 31, a first fuse portion 33, and a second connecting portion 35. The first fuse portion 33 is connected between the first connecting portion 31 and the second connecting portion 35. In this embodiment, the first connecting portion 31, the first fuse portion 33, and the second connecting portion 35 are integrally formed. The first connecting portion 31 is configured to be fixedly connected to the first electrode 570, and the second connecting portion 35 is configured to be fixedly connected to the first tab 330. This allows the first connecting piece 30 to be electrically connected between the first electrode 570 and the first tab 330, thereby electrically connecting the connecting assembly 710 between the first electrode 570 and the battery cell 300.

[0063] Among them, the contact area between the first connecting piece 30 and the first pole 570 is S1, that is, the contact area between the first connecting portion 31 and the first pole 570 is S1. In this embodiment, the first connecting portion 31 and the first pole 570 are welded to achieve electrical connection between the first connecting portion 31 and the first pole 570, and the contact area S1 is also the weld area between the first connecting portion 31 and the first pole 570. The first connecting portion 31 is provided with a fixing hole 311, and the fixing hole 311 passes through the first connecting portion 31 along the thickness direction of the first connecting portion 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 first connecting piece 30.

[0064] 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 first fuse portion 33 is D3, where D3 < D1 and D3 < D2. This ensures that the structural strength of the first 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 first 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 first fuse portion 33. This groove 301 is formed by thinning the first connecting piece 30 at the location of the first fuse portion 33 to achieve D3 < D1 and D3 < D2. At this point, at least one of the two surfaces of the first 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 first fuse part 33 can also be used to weaken the structural strength of the first fuse part 33. The embodiment of the present application does not limit the formation method of the first fuse part 33.

[0065] The first 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 first fuse portion 33 facing the second connecting portion 35. The second notch 303 extends through the first fuse portion 33 along its thickness. The second notch 303 is used to avoid the injection hole 535 and the injection diverter 503, thereby preventing the injection efficiency from being affected when the first connecting piece 30 and the lower insulating member 530 overlap.

[0066] The second connecting portion 35 is connected to the end of the first connecting portion 33 facing away from the first connecting portion 31, thereby connecting the first connecting portion 33 between the first connecting portion 31 and the second connecting portion 35. The second connecting portion 35 is provided with an escape space 331, which extends through the thickness of the second connecting portion 35. This 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 first connecting piece 30 and the lower insulating member 530 overlap. At this time, the surface of the first fuse 33 facing the second connecting portion 35 is exposed relative to the escape space 331. 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 first fuse 33 facing away from the first connecting portion 31, and are separated along the width direction of the first connecting piece 30 to form an escape space 331. The first connecting arm 351 and the second connecting arm 353 are both used to electrically connect to the first tab 330. In this embodiment, the second connecting portion 35 is connected to the first tab 330 by welding.

[0067] 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 .

[0068] 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.

[0069] In the assembled structure of the connection assembly 710, the first portion 61 of the insulating protective sleeve 60 is sleeved onto the outside of the first fuse portion 33 of the first connecting piece 30, thereby enabling the insulating protective sleeve 60 to be sleeved onto the outside of the first fuse portion 33, thereby enabling the insulating protective sleeve 60 to be sleeved onto the outside of the first connecting piece 30. The first insulating portion 611 and the second insulating portion 613 of the first portion 61 respectively cover two surfaces of the first fuse portion 33 along the thickness direction. The second portion 63 is fixedly connected to the first connecting portion 31 of the first connecting piece 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 portion 63 is located 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, thereby achieving a fixed connection between the second portion 63 and the first connecting portion 31 and covering a portion of the first connecting portion 31. This achieves a fixed connection between the insulating protective cover 60 and the first connecting piece 30, improving the secure assembly between the first connecting piece 30 and the insulating protective cover 60. At this time, the opening of the first notch 601 faces the second connecting portion 35 of the first connecting piece 30.

[0070] See also Figure 9 , Figure 9 for Figure 7 The figure shows a cross-sectional view of the connecting assembly 710. Along the direction from the first connecting portion 31 of the first connecting piece 30 toward the second connecting portion 35, the insulating protective sleeve 60 at least partially extends beyond the first fuse 33. In this embodiment, along the direction from the first connecting portion 31 toward the second connecting portion 35, the bottom wall of the first notch 601 in the insulating protective sleeve 60 extends beyond the bottom wall of the second notch 303, thereby allowing the bottom wall of the first notch 601 in the insulating protective sleeve 60 to extend beyond the first fuse 33, thereby allowing the insulating protective sleeve 60 to at least partially extend beyond the first fuse 33.

[0071] In this embodiment, along the extension direction of the first 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 first fuse portion 33 and the bottom wall of the second notch groove 303 is h2, and 0.10

[0072] 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 connecting component 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 first connecting piece 30 is electrically connected between the flange portion 507 of the first pole 570 and the first tab 330 of the battery cell 300. The first connecting piece 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 first connecting piece 30 is fixedly connected to the first pole 570, the second connecting portion 35 is fixedly connected to the first tab 330 of the battery cell 300, and the first fuse 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 first connecting piece 30 to avoid the injection hole 535 and the injection diverter 503 connected to the injection hole 535, thereby preventing the connection assembly 710 from overlapping with the lower insulating member 530 and affecting the injection efficiency. The first insulating portion 611 of the first portion 61 of the insulating protective sleeve 60 is located on the side of the first fuse 33 facing the escape groove 537, covers the surface of the first 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 first fuse 33 facing away from the escape groove 537 and covers the surface of the first fuse 33 facing away from the escape groove 537.

[0073] See Figure 12 , Figure 12 for Figure 11 ​The schematic diagram of the structure of section A in the cross-sectional structure shown. The first insulating portion 611 of the first portion 61 of the insulating protective sleeve 60 has a width of W1, and the width of the avoidance groove 537 along the extension direction of the lower insulating member 530 is W2. W2>W1, ensuring that the first insulating portion 611 covering the first fuse 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 projection of the injection hole 535 on the first connecting piece 30 is located within the avoidance space 331. The openings of the first notch 601 and the second notch 303 both face the injection hole 535 of the lower insulating member 530. This ensures that the avoidance space 331, the first notch 601, and the second notch 303 avoid the injection hole 535, thereby preventing the first 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 first connecting piece 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 first fuse 33, thereby ensuring that the insulating protective cover 60 at least partially extends beyond the bottom wall of the second notch 303 in the first fuse 33 along the extension direction of the first connecting piece 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 surface of the first fuse 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 surface of the first fuse 33 facing the second connecting portion 35.

[0074] See also Figure 10 and Figure 12The surface of the first connecting portion 31 in the first connecting piece 30 that faces away from the lower insulating member 530 is exposed relative to the third notch groove 603, which is conducive to welding the first connecting portion 31 to the first pole 570 through the third notch groove 603, thereby facilitating the welding of the first connecting portion 31 to the first pole 570, 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 first pole 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 first pole 570 protruding from the second surface 543 of the lower insulating member 530 is h, where H1-H2≤h.

[0075] Continue reading Figure 3 and Figure 4 The second connecting piece 730 is electrically connected between the flange portion 507 of the second pole 580 and the second tab 350, thereby electrically connecting the second connecting piece 730 between the second pole 580 and the second tab 350. In this embodiment, the structure of the second connecting piece 730 is the same as that of the first connecting piece 30. The second connecting piece 730 includes a third connecting portion, a fourth connecting portion, and a second fuse portion. The third connecting portion is fixedly connected to the flange portion 507 of the second pole 580. The fourth connecting portion is spaced apart from the third connecting portion and fixedly connected to the second tab 350. The second fuse portion is connected between the third and fourth connecting portions. Specifically, the structure of the second connecting piece 730 can refer to that of the first connecting piece 30. The electrical conductivity of the first connecting piece 30 is lower than that of the second connecting piece 730. In this embodiment, the material of the first connecting piece 30 is aluminum, and the material of the second connecting piece 730 is copper.

[0076] In this embodiment, the contact area between the second connecting piece 730 and the second terminal 580 is S2, that is, the weld area between the second connecting piece 730 and the second terminal 580 is S2. The contact area S1 between the first connecting piece 30 and the first terminal 570 is greater than the contact area S2 between the second connecting piece 730 and the second terminal 580. In this embodiment, the thickness of the first fuse portion 33 of the first connecting piece 30 is less than the thickness of the second fuse portion of the second connecting piece 730. The width of the first fuse portion 33 of the first connecting piece 30 along the extension direction of the first connecting piece 30 is greater than the width of the second fuse portion of the second connecting piece 730 along the extension direction of the second connecting piece 730.

[0077] In the connection assembly 710 provided in the embodiment of the present application, by providing the first connecting piece 30 with a first fuse 33, the first fuse 33 of the first connecting piece 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 covering the outer side of the first fuse 33 with an insulating protective cover 60, it is possible to prevent the first connecting piece 30 from being able to overlap after melting, thus preventing the small arc generated by the overlapping of the first connecting piece 30 after melting from igniting the electrolyte, thereby causing fire and explosion.

[0078] Furthermore, due to the thinness of the first connecting piece 30 at the location of the first fuse 33, the structural strength of the first fuse 33 is insufficient, making it susceptible to bending and causing the second connecting piece 35 to tilt. Providing an insulating protective cover 60 covering the first fuse 33 enhances the structural strength of the first connecting piece 30 at the location of the first fuse 33, thereby resolving the issue of the first connecting piece 30 being easily deformed under load. Furthermore, during vibration testing of the energy storage device, the repeated bending and deformation of the connecting piece can easily lead to breakage of the connecting piece even without a short circuit. In the embodiment of the present application, by arranging the insulating protective cover 60 to at least partially extend beyond the first fuse part 33 in the direction from the first connection part 31 toward the second connection part 35, the portion of the insulating protective cover 60 extending beyond the first fuse part 33 can increase the torque in the area of ​​the first fuse part 33, reduce the torque in the area of ​​the first fuse part 33 after the first connecting piece 30 is connected to the first pole ear 330, ensure the structural strength of the connecting assembly 710 at the first fuse part 33, and prevent abnormal fracture of the first fuse part 33 of the first connecting piece 30 during the vibration of the energy storage device 1000.

[0079] Furthermore, the insulating protective sleeve 60 is provided with a first notch 601, which provides clearance for the liquid injection hole 535 and the liquid injection diverter 503 of the lower insulating member 530, thereby preventing the connection assembly 710 from intersecting with the lower insulating member 530 and affecting the liquid injection efficiency of the energy storage device 1000. By ensuring that the bottom wall of the first notch 601 extends beyond the first fuse 33, the insulating protective sleeve 60 at least partially extends beyond the first fuse 33, thereby ensuring the structural strength of the connecting assembly 710 at the first fuse 33 and preventing abnormal fracture of the first connecting piece 30 during vibration of the energy storage device 1000.

[0080] In the embodiment of the present application, by providing the second notch 303 in the first fuse portion 33, the second notch 303 can avoid the liquid injection hole 535 and the liquid injection diverter 503, thereby avoiding affecting the liquid injection efficiency of the energy storage device 1000. At this time, by setting the bottom wall of the first notch 601 to extend beyond the bottom wall of the second notch 303, the insulating protective sleeve 60 is at least partially extended beyond the first fuse portion 33, thereby ensuring the structural strength of the connecting assembly 710 at the first fuse portion 33 and preventing abnormal fracture of the first connecting piece 30 during 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 part 35 away from the first fuse part 33 and the bottom wall of the second notch groove 303 to satisfy: 0.10

[0081] In addition, since the electrical conductivity of the first connecting piece 30 is lower than the electrical conductivity of the second connecting piece 730, the current conducting capacity of the first connecting piece 30 is lower than that of the second connecting piece 730. By setting the contact area S1 between the first connecting piece 30 and the first pole 570 to be greater than the contact area S2 between the second connecting piece 730 and the second pole 580, the current conducting area of ​​the first connecting piece 30 is increased by increasing the contact area S1 between the first connecting piece 30 and the first pole 570, thereby facilitating the first connecting piece 30 and the second connecting piece 730 to have the same current conducting efficiency, and further facilitating the consistency of the fusing of the positive and negative poles.

[0082] ​However, the thermal conductivity of the second connecting piece 730 (copper in this embodiment) is better than that of the first connecting piece 30 (aluminum in this embodiment). If the first fuse part 33 of the first connecting piece 30 is set too large, the heat generated is too small, making it difficult for the first fuse part 33 to melt. If the first fuse part 33 is set too small, the current conduction capacity of the first connecting piece 30 is small, which deteriorates the electrical performance of the energy storage device 1000. In order to balance the relationship between current conduction and heat conduction, so that the first connecting piece 30 and the second connecting piece 730 can be at the same temperature level, thereby ensuring that the first connecting piece 30 and the second connecting piece 730 melt at the same time, the embodiment of the present application sets the thickness of the first fuse part 33 of the first connecting piece 30 to be less than the thickness of the second fuse part of the second connecting piece 730, and / or sets the width of the first fuse part 33 along the extension direction of the first connecting piece 30 to be greater than the width of the second fuse part along the extension direction of the second connecting piece 730, so that the first fuse part 33 of the first connecting piece 30 is greater than the width of the second fuse part along the extension direction of the second connecting piece 730. The first fuse portion 33 is thinner or wider than the second fuse portion of the second connecting piece 730, making it easier for the first fuse portion 33 of the first connecting piece 30 to fuse. Furthermore, an insulating protective sleeve 60 is provided outside the first fuse portion 33 of the first connecting piece 30, ensuring safe and equal positioning of the energy storage device 1000 on both the positive and negative sides. This not only ensures a larger flow conducting area for the first connecting piece 30, but also increases the temperature-raising capacity of the first fuse portion 33 of the first connecting piece 30, thus providing early warning of safety issues with the energy storage device 1000. The insulating protective sleeve 60 also enhances the structural strength of the first fuse portion 33, thereby achieving a balance between the structural strength, flow conducting area, and safe fusing of the first connecting piece 30.

[0083] Furthermore, by providing a relief groove 537 on the lower insulating member 530, the relief groove 537 allows for the portion of the insulating sleeve 60 that protrudes from the first connecting piece 30 to avoid an increase in the overall thickness of the first connecting piece 30 after the insulating sleeve 60 is added. This, in turn, prevents the thickness of the insulating sleeve 60 from causing poor fit between the first connecting piece 30 and the flange portion 507 of the first terminal 570, thereby resulting in poor welding between the flange portion 507 of the first connecting piece 30 and the first terminal 570. This ensures a good weld between the first connecting piece 30 and the first terminal 570. Furthermore, the relief groove 537 reserves space for the insulating sleeve 60 in the connecting assembly 710. When the first connecting piece 30 melts, the insulating sleeve 60 absorbs most of the heat and further prevents heat dissipation. This makes it less likely that the insulating sleeve 60 will burn the lower insulating member 530 during heating, thereby reducing the probability of structural deformation of the lower insulating member 530. On the one hand, the first insulating portion 611 of the insulating protective cover 60 is accommodated within the relief groove 537, ensuring that the thickness of the first fuse portion 33 of the first connecting piece 30 is evenly matched with the thickness of the second connecting portion 35 of the first connecting piece 30 connected to the first tab 330, thereby preventing the second connecting portion 35 of the first connecting piece 30 connected to the first tab 330 from warping. Furthermore, the relief groove 537 accommodates the first insulating portion 611 of the insulating protective cover 60, thereby avoiding the problem of the insulating protective cover 60 occupying the electrolyte filling space when the relief groove 537 is not provided. This ensures the electrolyte filling amount, thereby facilitating an increase in the energy density of the assembled energy storage device 1000.

[0084] 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, a gap may exist between the first connecting piece 30 and the bottom surface of the flange portion 507 of the first pole 570, which may cause poor welding between the first connecting piece 30 and the first pole 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 height of the protrusion of the first pole 570 relative to the lower insulating member 530 are designed to meet the following conditions: H1-H2<h, which is conducive to the fitting of the first connecting piece 30 and the first pole 570, thereby ensuring the welding yield between the first connecting piece 30 and the first pole 570.

[0085] 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.

[0086] The present embodiment further provides an assembly method of the energy storage device 1000, including:

[0087] S10, assemble the battery cell 300, the first connecting piece 30 and the insulating protective cover 60 to obtain an intermediate component, the battery cell 300 includes a first pole ear 330, the first connecting piece 30 includes a first connecting part 31, a second connecting part 35 and a first fuse part 33, the first connecting part 31 is fixedly connected to the first pole 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 first pole 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 first fuse part 33.

[0088] In this embodiment, the first connecting piece 30 and the insulating protective cover 60 are first assembled to form a connecting assembly 710, and then the second connecting portion 35 of the first connecting piece 30 in the connecting assembly 710 is welded to the first pole ear 330 to achieve electrical connection between the first connecting piece 30 and the first pole ear 330, thereby achieving electrical connection between the connecting assembly 710 and the battery cell 300.

[0089] S20. Provide a lower insulating member 530 and a first pole 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 first through hole 531 and an avoidance groove 537. The first 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 first through hole 531 and is spaced apart from the first through hole 531. The opening of the avoidance groove 537 is located on the second surface 543. The first pole 570 is passed through the first through hole 531.

[0090] In the embodiment of the present application, step S10 and step S20 can be swapped.

[0091] S30, place the intermediate component on the side of the lower insulating member 530 provided with the avoidance groove 537, the first 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In the assembly method of the energy storage device 1000 provided in an embodiment of the present application, during the assembly of the connecting assembly 710 and the lower insulating member 530, a detection module is used to detect the position of the avoidance groove 537 of the lower insulating member 530 and the position of the insulating protective cover 60, so as to adjust the first insulating portion 611 of the insulating protective cover 60 to be located within the avoidance groove 537, thereby preventing the first connecting piece 30 from being tilted, thereby avoiding the problem of poor connection between the first connecting piece 30 and the first electrode tab 330, and at the same time avoiding the first connecting piece 30 from interfering with the injection of liquid into the injection hole 535 of the energy storage device 1000.

[0096] 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 first connecting piece 30 from being misaligned and thus preventing the first connecting piece 30 from interfering with liquid injection into the liquid injection hole 535 of the energy storage device 1000.

[0097] 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. A connection assembly, characterized in that: The connecting assembly is used to connect between the first pole and the first tab, and the connecting assembly includes a first connecting piece and an insulating protective sleeve. The first connecting piece includes a first connecting portion, a second connecting portion, and a first fuse portion. The first connecting portion is used to be fixedly connected to the first pole, and the second connecting portion is spaced apart from the first connecting portion and is used to be fixedly connected to the first tab. The first fuse portion is connected between the first connecting portion and the second connecting portion. The insulating protective sleeve covers the first fuse portion. The thickness of the first connecting portion is D1, the thickness of the second connecting portion is D2, and the thickness of the first fuse portion is D3. D3 satisfies the following: D3<D1, and D3<D2; The second connecting portion is provided with an escape space, the escape space passing through the second connecting portion, the surface of the first fuse portion facing the second connecting portion is exposed relative to the escape space, and the insulating protective sleeve at least partially extends beyond the first fuse portion in the direction from the first connecting portion toward the second connecting portion; The insulating protective sleeve is provided with a first notch groove, the opening of the first notch groove faces the second connecting part, and the first notch groove penetrates the insulating protective sleeve along the thickness direction of the insulating protective sleeve, the first fuse part is provided with a second notch groove, the opening of the second notch groove faces the second connecting part and is connected to the avoidance space, and along the extension direction of the first connecting piece and toward the direction of the second connecting part, the bottom wall of the first notch groove exceeds the bottom wall of the second notch groove.

2. The connection assembly according to claim 1, characterized in that Along the extension direction of the first 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.

3. The connection assembly according to claim 1, characterized in that The insulating protective cover includes a first part and a second part connected to the first part, the first part covers the first fuse part, and the second part is fixedly connected to the first connecting part and covers a part of the first connecting part.

4. An end cap assembly, characterized in that: The end cap assembly includes a lower insulating member, a first pole and a connecting assembly according to any one of claims 1 to 3, the lower insulating member is provided with a first through hole and an injection hole, the first through hole and the injection hole both pass through the lower insulating member and are spaced apart from each other, the first pole is passed through the first through hole, the connecting assembly is located on one side in the thickness direction of the lower insulating member, the first connecting portion is fixedly connected to the first pole, and the projection of the injection hole on the first connecting piece is located within the avoidance space.

5. The end cap assembly according to claim 4, wherein: The lower insulating member is provided with a second through hole, the second through hole passes through the lower insulating member, the injection hole is located between the first through hole and the second through hole, the end cover assembly further includes a second pole, the second pole is passed through the second through hole, the end cover assembly further includes a second connecting piece, the second connecting piece and the connecting assembly are located on the same side of the thickness direction of the lower insulating member, the second connecting piece is fixedly connected to the second pole, and is used to connect to the second tab; The contact area between the first connecting piece and the first pole is S1, the contact area between the second connecting piece and the second pole is S2, and S1>S2.

6. The end cap assembly according to claim 5, wherein: The second connecting piece includes a third connecting portion, a fourth connecting portion and a second fuse portion, the third connecting portion is fixedly connected to the second pole, and the second fuse portion is connected between the third connecting portion and the fourth connecting portion; The thickness of the first fuse portion is smaller than the thickness of the second fuse portion, and / or the width of the first fuse portion along the extending direction of the first connecting piece is larger than the width of the second fuse portion along the extending direction of the second connecting piece.

7. 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 4 to 6, the battery cell includes a first electrode tab, and the second connecting portion is fixedly connected to the first electrode tab.

Images