End cover assembly, energy storage device and electric equipment

Abstract

The invention provides an end cover assembly, an energy storage device and electric equipment, which are used for improving the welding reliability of a compression ring and a pole and ensuring the use reliability of the energy storage device. In the end cover assembly, the second mounting hole of the upper insulating part is communicated with the first mounting hole of the end cover. The first mounting groove of the upper insulating part is arranged around the second mounting hole and is communicated with the second mounting hole. And in the first mounting groove, the groove bottom wall surface is a rough surface. The groove side wall face is connected with the groove bottom wall face and arranged around the groove bottom wall face. The pressing ring is installed in the first installation groove. In the pressing ring, the first surface and the groove bottom wall face define a first exhaust channel. The peripheral side face and the groove side wall face define a second exhaust channel, and the second exhaust channel communicates with the first exhaust channel and the external environment. In the pressing ring, the third mounting hole and the second mounting hole are communicated with the first exhaust channel. And the pole penetrates through the first mounting hole, the second mounting hole and the third mounting hole and is welded and fixed with the hole wall surface of the third mounting hole.

Description

Technical Field

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

[0002] A secondary battery (Rechargeable battery), also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharging. The recyclable characteristic of the secondary battery has gradually made it the main power source of electrical equipment. With the increasing demand for secondary batteries, people have higher and higher requirements for various aspects of their performance, especially for the reliability of the use of secondary batteries. In existing secondary batteries, a pressure ring is often assembled with a pole post by welding. However, during the process of butt-welding the pressure ring and the pole post, there are many welding defects such as explosion points or pinholes at the welding position of the pole post and the pressure ring, which reduces the welding reliability of the pressure ring and the pole post and affects the reliability of the battery in use. Summary of the Invention

[0003] The present application provides an end cover assembly, an energy storage device, and an electrical equipment to improve the welding reliability of the pressure ring and the pole post and ensure the reliability of the use of the energy storage device.

[0004] In a first aspect, the present application provides an end cover assembly for an energy storage device, including an end cover, an upper insulating member, a pole post, and a pressure ring;

[0005] The end cover is provided with a first mounting hole that penetrates the end cover along the thickness direction of the end cover;

[0006] Along the thickness direction of the end cover, the upper insulating member is mounted on one side of the end cover. The upper insulating member is provided with a second mounting hole and a first mounting groove. The second mounting hole penetrates the upper insulating member along the thickness direction of the upper insulating member and is communicated with the first mounting hole. The opening of the first mounting groove is located on the surface of the upper insulating member facing away from the end cover. The first mounting groove surrounds the second mounting hole and is communicated with the second mounting hole. The first mounting groove has a bottom wall surface and a side wall surface. The bottom wall surface is opposite to the opening of the first mounting groove and is a rough surface. The side wall surface is connected to the bottom wall surface and surrounds the bottom wall surface;

[0007] The pressure ring is mounted in the first mounting groove. The pressure ring has a first surface, a second surface, and a circumferential side surface. The first surface faces the bottom wall surface and encloses a first exhaust channel with the bottom wall surface. The first exhaust channel is communicated with the second mounting hole. The second surface is opposite to the first surface. The circumferential side surface is connected between the first surface and the second surface;

[0008] In the first case, the upper insulating member is provided with a convex portion, the convex portion is provided on the side wall surface of the groove, and abuts against the circumferential side surface to form a second exhaust passage between the side wall surface of the groove and the circumferential side surface; or, in the second case, the pressing ring is provided with a convex portion, the convex portion is provided on the circumferential side surface, and abuts against the side wall surface of the groove to form a second exhaust passage between the circumferential side surface and the side wall surface of the groove;

[0009] Wherein, the second exhaust passage communicates the first exhaust passage with the external environment;

[0010] The pressing ring is provided with a third mounting hole, the third mounting hole penetrates through the first surface and the second surface, and communicates with the second mounting hole and the first exhaust passage;

[0011] The pole column is inserted through the first mounting hole, the second mounting hole and the third mounting hole, and is fixedly welded to the hole wall surface of the third mounting hole.

[0012] During the welding process of the pressing ring and the pole column, the gas between the pole column and the pressing ring will expand under the influence of high temperature, and the expanded gas can be discharged to the external environment along the first exhaust passage and the second exhaust passage. The gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column and the pressing ring, ensure the welding reliability between the pole column and the pressing ring, and further ensure the assembly reliability of the end cover assembly.

[0013] The design of the convex portion can not only achieve the interference fit between the pressing ring and the first mounting groove of the upper insulating member, ensure the assembly stability between the pressing ring and the upper insulating member, but also space the circumferential side surface of the pressing ring from the side wall surface of the first mounting groove, ensuring that the circumferential side surface of the pressing ring and the side wall surface of the first mounting groove can enclose and form a second exhaust passage.

[0014] Wherein, the rough surface has a plurality of pits, the openings of the plurality of pits are all located on the bottom wall surface of the groove, the plurality of pits communicate with each other, at least one of the pits communicates with the second mounting hole, at least one of the pits communicates with the second exhaust passage, and the plurality of pits and the first surface enclose and form the first exhaust passage.

[0015] The design of the plurality of pits and / or the plurality of protrusions can make the bottom wall surface of the groove a rough surface, so that the bottom wall surface of the groove and the first surface shell enclose and form the first exhaust passage. During the welding process of the pressing ring and the pole column, the gas between the pole column and the pressing ring will expand under the influence of high temperature, and the expanded gas can be discharged to the external environment along the first exhaust passage and the second exhaust passage. The gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column and the pressing ring, ensure the welding reliability between the pole column and the pressing ring, and further ensure the assembly reliability of the end cover assembly.

[0016] Wherein, the upper insulating member is further provided with a plurality of exhaust grooves. The openings of the plurality of exhaust grooves are all located on the bottom wall surface of the grooves. The plurality of exhaust grooves communicate with each other. At least one of the exhaust grooves communicates with the second mounting hole, and at least one of the exhaust grooves communicates with the second exhaust passage. The plurality of exhaust grooves and the first surface enclose to form the first exhaust passage.

[0017] The design of the exhaust grooves can increase the cross-section of the first exhaust passage, increase the speed of the gas discharged from the first exhaust passage to the external environment, and contribute to improving the welding efficiency between the pressure ring and the pole column.

[0018] Wherein, the first exhaust passage includes a plurality of first exhaust grooves and a plurality of second exhaust grooves. The plurality of first exhaust grooves extend in a first direction and are arranged at intervals in a second direction. The plurality of second exhaust grooves extend in the second direction and are arranged at intervals in the first direction. Each of the second exhaust grooves communicates with at least one of the first exhaust grooves. Wherein, the first direction intersects with the second direction.

[0019] The design of the first exhaust grooves and the second exhaust grooves can enable the gas to be discharged from multiple directions to the second exhaust passage, increase the speed of the gas discharged from the first exhaust passage to the external environment, and contribute to improving the welding efficiency between the pressure ring and the pole column.

[0020] Wherein, the end cover assembly further includes a sealing ring. The sealing ring is sleeved on the pole column and is arranged in the first mounting hole, and is clamped between the pole column and the hole wall surface of the first mounting hole in the radial direction of the pole column. It can not only prevent the pole column from contacting the end cover and causing a short circuit, but also seal the gap between the pole column and the end cover, ensuring the sealing reliability of the end cover assembly.

[0021] Wherein, the end cover is further provided with a plurality of first limiting holes. The openings of the plurality of first limiting holes face the upper insulating member. The plurality of first limiting holes are arranged around the first mounting hole and are spaced from the first mounting hole;

[0022] The upper insulating member is further provided with a plurality of second limiting holes. The plurality of second limiting holes penetrate through the bottom wall surface and the surface of the upper insulating member facing the end cover. The plurality of second limiting holes are arranged around the second mounting hole and are spaced from the second mounting hole. The second limiting holes communicate with the first limiting holes in one-to-one correspondence;

[0023] The pressure ring is provided with a plurality of third limiting holes. The openings of the plurality of third limiting holes are located on the first surface. The plurality of third limiting holes are arranged around the third mounting hole and are spaced from the third mounting hole. The third limiting holes communicate with the second limiting holes in one-to-one correspondence;

[0024] The end cover assembly also includes a plurality of limiting columns, which are respectively and one by one inserted into the second limiting holes, one end of the limiting column is inserted into the corresponding first limiting hole, and the other end is inserted into the corresponding third limiting hole.

[0025] The design of the limit column can not only increase the assembly stability of the end cover assembly, but also improve the torsional strength of the pole and improve the reliability of the energy storage device.

[0026] Wherein, the upper insulating member is provided with a protrusion, which is arranged on the hole wall surface of the second limiting hole and abuts against the limiting column to achieve interference assembly between the limiting column and the second limiting hole of the upper insulating member, thereby ensuring assembly stability between the limiting column and the upper insulating member.

[0027] There are a plurality of protrusions, and the plurality of protrusions are arranged at intervals around the second limiting hole to improve the assembly stability of the limiting column in the second limiting hole and prevent the limiting column from tilting.

[0028] There are multiple protrusions, which are spaced apart around the pressure ring, and the extension direction of the protrusions is parallel to the thickness direction of the end cover assembly to achieve interference fitting between the pressure ring and the first mounting groove of the upper insulating member, thereby ensuring the assembly stability between the pressure ring and the upper insulating member.

[0029] In a second aspect, the present application provides an end cap assembly for an energy storage device, comprising an end cap, an upper insulating member, a pole and a pressure ring;

[0030] The end cover is provided with a first mounting hole, and the first mounting hole penetrates the end cover along the thickness direction of the end cover;

[0031] The upper insulating member is mounted on one side of the end cover in the thickness direction of the end cover, and the upper insulating member is provided with a second mounting hole and a first mounting groove, the second mounting hole penetrates the upper insulating member in the thickness direction of the upper insulating member and is communicated with the first mounting hole, the opening of the first mounting groove is located on the surface of the upper insulating member away from the end cover, the first mounting groove is arranged around the second mounting hole, and is communicated with the second mounting hole, the first mounting groove has a groove bottom wall surface and a groove side wall surface, the groove bottom wall surface is arranged opposite to the opening of the first mounting groove and is a rough surface, and the groove side wall surface is connected to the groove bottom wall surface and is arranged around the groove bottom wall surface;

[0032] The pressure ring is installed in the first installation groove. The pressure ring has a first surface, a second surface and a peripheral side surface. The first surface faces the bottom wall surface of the groove, and encloses a first sub-exhaust channel and a second sub-exhaust channel with the bottom wall surface of the groove. The first sub-exhaust channel is communicated with the second installation hole. The second sub-exhaust channel is arranged at a radial interval from the first sub-exhaust channel in the pole column. The second surface is arranged opposite to the first surface. The peripheral side surface is connected between the first surface and the second surface;

[0033] In the first case, the upper insulating member is provided with a convex portion. The convex portion is arranged on the side wall surface of the groove and abuts against the peripheral side surface to form a second exhaust channel between the side wall surface of the groove and the peripheral side surface; or, in the second case, the pressure ring is provided with a convex portion. The convex portion is arranged on the peripheral side surface and abuts against the side wall surface of the groove to form a second exhaust channel between the peripheral side surface and the side wall surface of the groove;

[0034] Wherein, the second exhaust channel communicates the second sub-exhaust channel with the external environment;

[0035] The pressure ring is provided with a third installation hole. The third installation hole penetrates through the first surface and the second surface and is communicated with the second installation hole and the first exhaust channel;

[0036] The pressure ring has a welding portion. The welding portion is used for welding and fixing the pressure ring and the connecting tab and is arranged around the pole column;

[0037] The upper insulating member has a sealing portion. The sealing portion is arranged on the bottom wall surface of the groove and is arranged around the pole column. The sealing portion is located between the first sub-exhaust channel and the second sub-exhaust channel and separates the first sub-exhaust channel and the second sub-exhaust channel. Wherein, the projection of the welding portion on the bottom wall surface of the groove covers at least part of the sealing portion;

[0038] The pole column penetrates through the first installation hole, the second installation hole and the third installation hole and is welded and fixed to the hole wall surface of the third installation hole.

[0039] During the welding process of the connecting tab and the pressure ring, the welding heat will be conducted through the pressure ring to the bottom wall surface of the upper insulating member. The local part of the upper insulating member will melt and collapse to fill the first exhaust channel, so as to form a sealing portion on the bottom wall surface of the groove to separate the first exhaust channel into a first sub-exhaust channel and a second sub-exhaust channel. It can be understood that since the welding portion is annular, an annular sealing portion will also be formed on the bottom wall surface of the groove, so that the sealing portion can block the entry of external water vapor from the second exhaust channel and the second sub-exhaust channel into the first sub-exhaust channel to erode the sealing ring, ensuring the sealing reliability of the end cover assembly and improving the service life of the energy storage device.

[0040] Among them, the first sub-exhaust passage has a first port facing the sealing portion, and the second sub-exhaust passage has a second port facing the sealing portion. Along the length direction of the first sub-exhaust passage, the projection of the first port on the second sub-exhaust passage covers at least part of the second port.

[0041] Before the connecting tab is welded to the pressure ring, the first port and the second port are communicated, and the first sub-exhaust passage and the second sub-exhaust passage are communicated. During the welding process of the pressure ring and the pole column, the gas between the pole column and the pressure ring will expand under the influence of high temperature. The expanded gas can be discharged to the external environment along the first exhaust passage and the second exhaust passage, and the gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column and the pressure ring, ensure the welding reliability between the pole column and the pressure ring, and further ensure the assembly reliability of the end cap assembly.

[0042] In a third aspect, the present application provides an energy storage device, including a housing and any one of the above-mentioned end cap assemblies. The housing is provided with an opening, and the end cap assembly is installed on the housing and closes the opening.

[0043] During the welding process of the pressure ring and the pole column, the gas between the pole column and the pressure ring will expand under the influence of high temperature. The expanded gas can be discharged to the external environment along the first exhaust passage and the second exhaust passage, and the gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column and the pressure ring, ensure the welding reliability between the pole column and the pressure ring, ensure the assembly reliability of the end cap assembly, and thus improve the use reliability of the energy storage device.

[0044] In a fourth aspect, the present application provides an electrical equipment, including the above-mentioned energy storage device, and the energy storage device supplies power to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments of the present application will be described below.

[0046] Figure 1 is a schematic structural diagram of the energy storage device provided by the present application;

[0047] Figure 2 is Figure 1 a schematic structural diagram of the end cap assembly in the energy storage device shown;

[0048] Figure 3 is Figure 2 a schematic structural diagram of the end cap assembly shown after being cut along A-A;

[0049] Figure 4 is Figure 2Exploded structural schematic diagram of the shown end cover assembly in the first embodiment;

[0050] Figure 5 is Figure 4 Structural schematic diagram of the end cover and the lower insulating part in the shown end cover assembly;

[0051] Figure 6 is Figure 4 Structural schematic diagram of the upper insulating part in the shown end cover assembly;

[0052] Figure 7 is Figure 4 Structural schematic diagram of the pressure ring in the shown end cover assembly from another angle;

[0053] Figure 8 is Figure 2 Structural schematic diagram of the shown end cover assembly after being partially cut open in the first embodiment;

[0054] Figure 9 is Figure 2 Exploded structural schematic diagram of the shown end cover assembly in the second embodiment;

[0055] Figure 10 is Figure 9 Structural schematic diagram of the upper insulating part in the shown end cover assembly;

[0056] Figure 11 is Figure 2 Structural schematic diagram of the shown end cover assembly after being partially cut open in the second embodiment.

[0057] The names corresponding to the reference numerals in the figure are:

[0058] Energy storage device 100, housing 110, end cap assembly 120, end cap 10, lower insulating member 20, explosion-proof valve 30, protection sheet 40, upper insulating member 50, compression ring 60, pole column 70, sealing ring 80, limit post 90, connecting bar piece 130, third surface 101, fourth surface 102, explosion-proof hole 103, liquid inlet hole 104, first mounting hole 105, second mounting groove 106, first limiting hole 107, explosion-proof fence 21, liquid injection hole 201, fourth mounting hole 202, fifth surface 501, sixth surface 502, second mounting hole 503, first mounting groove 504, second limiting hole 505, bottom wall surface 506, groove side wall surface 507, convex portion 51, convex point 52, first abutting surface 511, first guiding surface 512, second abutting surface 521, second guiding surface 522, third guiding surface 523, first surface 601, second surface 602, peripheral side surface 603, first exhaust passage 121, second exhaust passage 122, third mounting hole 604, third limiting hole 605, welding portion 123, sealing portion 124, first sub-exhaust passage 121a, second sub-exhaust passage 121b, first port 121c, second port 121d, exhaust groove 508, first exhaust groove 508a and second exhaust groove 508b. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0060] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of the energy storage device 100 provided by the present application. Among them, for the convenience of description, the width direction of the energy storage device 100 is defined as the X-axis direction, the length direction of the energy storage device 100 is defined as the Y-axis direction, the height direction of the energy storage device 100 is defined as the Z-axis direction, and the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other in pairs.

[0061] The present application provides an energy storage device 100, and the energy storage device 100 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. The actual application forms of the energy storage device 100 provided by the present application may be but are not limited to the listed products, and may also be other application forms. The present application does not strictly limit the application forms of the energy storage device 100. The present application takes the energy storage device 100 as a square battery as an example for illustration.

[0062] The energy storage device 100 includes a housing 110, an electrode assembly (not shown in the figure), and an end cover assembly 120. The housing 110 is provided with a receiving cavity (not shown in the figure) and an opening (not shown in the figure). The receiving cavity is disposed inside the housing 110 and contains electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. Among them, the housing 110 can be made of aluminum. For example, the housing 110 can be an aluminum shell. The electrode assembly is received in the receiving cavity. The electrode assembly can be immersed in the electrolyte. The end cover assembly 120 is installed on the housing 110, closes the opening, and is electrically connected to the electrode assembly.

[0063] Please refer to Figures 2 to 4 , Figure 2 is Figure 1 a schematic structural view of the end cover assembly 120 in the energy storage device 100 shown in Figure 3 is Figure 2 a schematic structural view of the end cover assembly 120 after being cut along the A-A line. Figure 4 is Figure 2 a schematic exploded view of the end cover assembly 120 in the first embodiment. Among them, Figure 2 and Figure 4 the connection bus bar 130 is not shown. "Cut along the A-A line" means cutting along the plane where the A-A line is located, and the same understanding can be made for similar descriptions hereinafter.

[0064] The end cover assembly 120 includes an end cover 10, a lower insulating member 20, an explosion-proof valve 30, a protection sheet 40, an upper insulating member 50, a compression ring 60, a terminal post 70, a sealing ring 80, a limiting post 90, and a connection bus bar 130. Along the thickness direction of the end cover 10 (the Z-axis direction shown in the figure), the lower insulating member 20 is installed on one side of the end cover 10. The explosion-proof valve 30 and the protection sheet 40 are both installed on the end cover 10. Along the thickness direction of the end cover 10, the upper insulating member 50 is installed on the other side of the end cover 10. Among them, there are two upper insulating members 50. Along the length direction of the end cover 10 (the X-axis direction shown in the figure), the two upper insulating members 50 are arranged at intervals. One upper insulating member 50 serves as the positive electrode insulating member, and the other upper insulating member 50 serves as the negative electrode insulating member. The compression ring 60 is installed on the upper insulating member 50. Among them, there are two compression rings 60. One compression ring 60 serves as the positive electrode compression ring and is installed on the positive electrode insulating member. The other compression ring 60 serves as the negative electrode compression ring and is installed on the negative electrode insulating member.

[0065] In the thickness direction of the end cover assembly 120 (the Z-axis direction shown in the figure), the pole columns 70 pass through the end cover 10, the lower insulating part 20, the upper insulating part 50 and the pressure ring 60, and are fixedly connected to the pressure ring 60. Among them, there are two pole columns 70. One pole column 70 serves as the positive pole column and passes through the end cover 10, the lower insulating part 20, the positive upper insulating part and the positive pressure ring, and is fixedly connected to the positive pressure ring. The other pole column 70 serves as the negative pole column and passes through the end cover 10, the lower insulating part 20, the negative upper insulating part and the negative pressure ring, and is fixedly connected to the negative pressure ring. The sealing rings 80 are sleeved on the pole columns 70 and clamped between the end cover 10 and the pole columns 70. Among them, there are two sealing rings 80. One sealing ring 80 serves as the positive sealing ring and is sleeved on the positive pole column and clamped between the end cover 10 and the positive pole column. The other sealing ring 80 serves as the negative sealing ring and is sleeved on the negative pole column and clamped between the end cover 10 and the negative pole column.

[0066] In the thickness direction of the end cover assembly 120, the limiting columns 90 pass through the upper insulating part 50 and abut between the end cover 10 and the pressure ring 60. Among them, there are multiple limiting columns 90. A part of the limiting columns 90 pass through the positive insulating part and abut between the end cover 10 and the positive pressure ring and are arranged at intervals around the positive pole column. Another part of the limiting columns 90 pass through the negative insulating part and abut between the end cover 10 and the negative pressure ring and are arranged at intervals around the negative pole column. Exemplarily, there are six limiting columns 90. Three limiting columns 90 pass through the positive insulating part and abut between the end cover 10 and the positive pressure ring and are arranged at intervals around the positive pole column. Three limiting columns 90 pass through the negative insulating part and abut between the end cover 10 and the negative pressure ring and are arranged at intervals around the negative pole column. The connecting bar piece 130 is located on the side of the pressure ring 60 away from the end cover 10 and is fixedly connected to the pressure ring 60. Among them, there are two connecting bar pieces 130. One connecting bar piece 130 serves as the positive connecting bar piece and is located on the side of the positive pressure ring away from the end cover 10 and is fixedly connected to the positive pressure ring. The other connecting bar piece 130 serves as the negative connecting bar piece and is located on the side of the negative pressure ring away from the end cover 10 and is fixedly connected to the negative pressure ring.

[0067] Please refer to Figure 5 , Figure 5 is Figure 4 the schematic structural diagram of the end cover 10 and the lower insulating part 20 in the end cover assembly 120 shown in the figure.

[0068] The end cover 10 has a third surface 101 and a fourth surface 102. In the thickness direction of the end cover 10, the third surface 101 and the fourth surface 102 are arranged back to back. The end cover 10 is provided with an explosion-proof hole 103, a liquid inlet hole 104, a first mounting hole 105, a second mounting groove 106 and a first limiting hole 107. The explosion-proof hole 103, the liquid inlet hole 104 and the first mounting hole 105 all penetrate through the end cover 10 in the thickness direction of the end cover 10. That is, the explosion-proof hole 103, the liquid inlet hole 104 and the first mounting hole 105 all penetrate through the third surface 101 and the fourth surface 102. In the length direction of the end cover 10, the explosion-proof hole 103 is located in the middle of the end cover 10, the liquid inlet hole 104 is located on one side of the explosion-proof hole 103 and is spaced from the explosion-proof hole 103. Among them, there are two first mounting holes 105. One first mounting hole 105 is located on the side of the liquid inlet hole 104 away from the explosion-proof hole 103 and is spaced from the liquid inlet hole 104. The other second mounting hole is located on the side of the explosion-proof hole 103 away from the liquid inlet hole 104 and is spaced from the explosion-proof hole 103.

[0069] The opening of the second mounting groove 106 is located on the third surface 101. The second mounting groove 106 is recessed from the third surface 101 towards the fourth surface 102 (the negative direction of the illustrated Z axis), surrounds the first mounting hole 105 and is communicated with the first mounting hole 105. Among them, there are two second mounting grooves 106. In the length direction of the end cover 10, the two second mounting grooves 106 are spaced apart. Each second mounting groove 106 surrounds a first mounting hole 105 and is communicated with a first mounting hole 105. Exemplarily, the second mounting groove 106 is in a regular hexagon shape, and the second mounting groove 106 has six groove side wall surfaces (not marked in the figure), and the six groove side wall surfaces are connected end to end in sequence, and two groove side wall surfaces are parallel to the width direction of the end cover 10 (the illustrated Y axis direction).

[0070] The opening of the first limiting hole 107 faces the upper insulating member 50 and is located on the bottom wall surface of the second mounting groove 106. The first limiting hole 107 is recessed from the bottom wall surface of the second mounting groove 106 towards the fourth surface 102 (the negative direction of the illustrated Z axis) and is spaced from the first mounting hole 105. Among them, there are multiple first limiting holes 107. A part of the first limiting holes 107 are arranged at intervals around one first mounting hole 105, and the other part of the first limiting holes 107 are arranged at intervals around the other first mounting hole 105. Exemplarily, there are six first limiting holes 107, and every three first limiting holes 107 are evenly arranged at intervals around a first mounting hole 105.

[0071] The lower insulating member 20 is located on the side of the fourth surface 102 away from the third surface 101. The lower insulating member 20 has an explosion-proof fence 21. Along the length direction of the lower insulating member 20 (the Y-axis direction shown in the figure), the explosion-proof fence 21 is located in the middle of the lower insulating member 20 and is arranged opposite to the explosion-proof hole 103. The lower insulating member 20 is provided with a liquid injection hole 201 and a fourth mounting hole 202. Both the liquid injection hole 201 and the fourth mounting hole 202 penetrate the lower insulating member 20 along the thickness direction of the lower insulating member 20 (the Z-axis direction shown in the figure). Along the length direction of the lower insulating member 20, the liquid injection hole 201 is located on one side of the explosion-proof fence 21, is spaced from the explosion-proof fence 21, and is communicated with the liquid inlet hole 104. External electrolyte can enter the interior of the energy storage device 100 through the liquid inlet hole 104 and the liquid injection hole 201 in sequence to realize liquid injection into the energy storage device 100. Among them, there are two fourth mounting holes 202. One fourth mounting hole 202 is located on the side of the liquid injection hole 201 away from the explosion-proof fence 21, is spaced from the liquid injection hole 201, and is communicated with the corresponding first mounting hole 105. The other fourth mounting hole 202 is located on the side of the explosion-proof fence 21 away from the liquid injection hole 201, is spaced from the explosion-proof fence 21, and is communicated with the corresponding first mounting hole 105.

[0072] The explosion-proof valve 30 covers the opening of the explosion-proof hole 103 on the fourth surface 102. The protective sheet 40 covers the opening of the explosion-proof hole 103 on the third surface 101. When the air pressure inside the energy storage device 100 is too high, the gas inside the energy storage device 100 can be discharged to the outside of the energy storage device 100 in sequence through the explosion-proof fence 21 and the explosion-proof hole 103 in time, and the explosion-proof valve 30 will rupture under the action of the air pressure, avoiding the explosion of the energy storage device 100 and improving the use reliability of the energy storage device 100.

[0073] Please refer to Figure 6 , Figure 6 is Figure 4 the schematic structural diagram of the upper insulating member 50 in the end cover assembly 120 shown.

[0074] Each upper insulating member 50 is installed in a second installation groove 106. Exemplarily, each upper insulating member 50 is in a regular hexagon shape and is adapted to a second installation groove 106. Each upper insulating member 50 has a fifth surface 501 and a sixth surface 502. The fifth surface 501 is the surface of the upper insulating member 50 away from the end cover 10. Along the thickness direction of the upper insulating member 50 (the Z-axis direction shown in the figure), the sixth surface 502 is arranged opposite to the fifth surface 501. That is, the sixth surface 502 is the surface of the upper insulating member 50 facing the end cover 10.

[0075] Each upper insulating member 50 is provided with a second mounting hole 503, a first mounting groove 504 and a second limiting hole 505. The second mounting hole 503 penetrates the upper insulating member 50 along the thickness direction of the upper insulating member 50 and communicates with the first mounting hole 105. That is, the second mounting hole 503 penetrates the fifth surface 501 and the sixth surface 502. The opening of the first mounting groove 504 is located on the fifth surface 501. The first mounting groove 504 is recessed from the fifth surface 501 towards the sixth surface 502 (the negative Z-axis direction in the figure). Among them, the first mounting groove 504 has a groove bottom wall surface 506 and a groove side wall surface 507. The groove bottom wall surface 506 is disposed opposite to the opening of the first mounting groove 504. The groove side wall surface 507 is disposed around the groove bottom wall surface 506 and is connected between the groove bottom wall surface 506 and the fifth surface 501. Exemplarily, the first mounting groove 504 is a regular hexagon, and the groove side wall surface 507 includes six third groove wall surfaces (not labeled in the figure), and the six third groove wall surfaces are sequentially connected end to end, and two third groove wall surfaces are parallel to the width direction of the end cover assembly 120 (the Y-axis direction in the figure).

[0076] In this embodiment, the groove bottom wall surface 506 is a rough surface. Exemplarily, the groove bottom wall surface 506 is a frosted surface. Among them, the rough surface has a plurality of pits (not shown in the figure) and a plurality of protrusions (not shown in the figure). The opening of the pit is located on the groove bottom wall surface 506. The pit is recessed from the groove bottom wall surface 506 towards the sixth surface 502 (the negative Z-axis direction in the figure). The plurality of pits communicate with each other. At least one pit communicates with the second mounting hole 503. The protrusion is provided on the groove bottom wall surface 506 and protrudes from the groove bottom wall surface 506 in a direction away from the sixth surface 502.

[0077] It should be noted that the upper insulating member 50 can be formed by an injection molding process. During the injection molding process of forming the upper insulating member 50, tiny protrusions and pits can be formed on the surface of the injection mold by means of electric discharge machining first, so that reverse pits and protrusions can be formed on the groove bottom wall surface 506 when the upper insulating member 50 is injection molded, thereby obtaining the rough groove bottom wall surface 506. It should be understood that the upper insulating member 50 can also be provided with only pits or protrusions, and the present application does not make specific restrictions on this.

[0078] The second limiting hole 505 penetrates the groove bottom wall surface 506 and the sixth surface 502, and is spaced from both the second mounting hole 503 and the groove side wall surface 507, and communicates with the first limiting hole 107. Among them, there are a plurality of second limiting holes 505, and the plurality of second limiting holes 505 are arranged at intervals around the second mounting hole 503 and communicate with the plurality of first limiting holes 107 in one-to-one correspondence. Exemplarily, there are three second limiting holes 505, and the three second limiting holes 505 are evenly spaced around the second mounting hole 503.

[0079] In addition, each upper insulating member 50 is further provided with a convex portion 51 and a convex point 52. The convex portion 51 is provided on the side wall surface 507 of the groove, and protrudes from the side wall surface 507 of the groove in the direction of the second mounting hole 503. Exemplarily, the convex portion 51 is strip-shaped, and the extending direction of the convex portion 51 is parallel to the thickness direction of the end cover assembly 120. Among them, there are multiple convex portions 51, and the multiple convex portions 51 are arranged at intervals around the bottom wall surface 506 of the groove. Exemplarily, there are twelve convex portions 51, and every two convex portions 51 are provided on one third groove wall surface.

[0080] Each convex portion 51 has a first abutting surface 511 and a first guiding surface 512. The first abutting surface 511 is the surface of the convex portion 51 facing away from the side wall surface 507 of the groove. The first guiding surface 512 is connected between the first abutting surface 511 and the fifth surface 501. In the direction from the fifth surface 501 to the sixth surface 502, the distance between the first guiding surface 512 and the side wall surface 507 of the groove gradually increases. Exemplarily, the first guiding surface 512 can be an inclined surface or an arc surface.

[0081] The convex point 52 is provided on the hole wall surface of the second limiting hole 505, and protrudes from the hole wall surface of the second limiting hole 505 towards the central axis of the second limiting hole 505. Among them, there are multiple convex points 52. Each part of the convex points 52 is provided on the hole wall surface of one second limiting hole 505, and is arranged at intervals around the second limiting hole 505. Exemplarily, there are nine convex points 52, and every three convex points 52 are provided on the hole wall surface of one second limiting hole 505, and are evenly spaced around one second limiting hole 505.

[0082] Each convex point 52 has a second abutting surface 521, a second guiding surface 522 and a third guiding surface 523. The second abutting surface 521 is the surface of the convex point 52 facing away from the hole wall surface of the second limiting hole 505. The second guiding surface 522 is connected between the second abutting surface 521 and the bottom wall surface 506 of the groove. In the direction from the bottom wall surface 506 to the sixth surface 502 (the negative Z-axis direction in the figure), the distance between the second guiding surface 522 and the hole wall surface of the second limiting hole gradually increases. Exemplarily, the second guiding surface 522 can be an inclined surface or an arc surface. The third guiding surface 523 is connected between the second abutting surface 521 and the sixth surface 502. In the direction from the sixth surface 502 to the bottom wall surface 506 (the positive Z-axis direction in the figure), the distance between the third guiding surface 523 and the hole wall surface of the second limiting hole gradually increases. Exemplarily, the third guiding surface 523 can be an inclined surface or an arc surface. In some other embodiments, each convex point 52 can also have only the second guiding surface 522 or the third guiding surface 523, and the present application does not make specific limitations thereon.

[0083] Please refer to Figure 7 , Figure 7 which is Figure 4 a schematic structural view of the pressure ring 60 in the end cover assembly 120 shown from another angle.

[0084] Each pressure ring 60 is installed in the first installation groove 504 of an upper insulating part 50. Exemplarily, each pressure ring 60 is in a regular hexagon shape and is adapted to the first installation groove 504 of an upper insulating part 50. Each pressure ring 60 has a first surface 601, a second surface 602 and a peripheral side surface 603. The first surface 601 is the surface of the pressure ring 60 facing the bottom wall surface 506 of the groove, and forms a first exhaust passage 121 with the bottom wall surface 506 of the groove. Among them, the first exhaust passage 121 communicates with the second installation hole 503.

[0085] It should be noted that since the bottom wall surface 506 of the groove is a rough surface, the first surface 601 will not be completely attached to the bottom wall surface 506 of the groove, and the non-attached part of the first surface 601 and the bottom wall surface 506 of the groove can enclose to form a first exhaust passage. For example, the first surface 601 can enclose with the pits on the bottom wall surface 506 of the groove to form the first exhaust passage 121.

[0086] In the thickness direction of the pressure ring 60 (the Z-axis direction shown in the figure), the second surface 602 is arranged opposite to the first surface 601. That is, the second surface 602 is the surface of the pressure ring 60 facing away from the bottom wall surface 506 of the groove. The peripheral side surface 603 is connected between the first surface 601 and the second surface 602 and is spaced from the groove side wall surface 507.

[0087] In this embodiment, the convex part 51 of the upper insulating part 50 abuts against the peripheral side surface 603 of the pressure ring 60 to form a second exhaust passage 122 between the groove side wall surface 507 and the peripheral side surface 603. The second exhaust passage 122 communicates with the first exhaust passage 121 and the external environment. Specifically, the first abutting surface 511 of the convex part 51 abuts against the peripheral side surface 603 of the pressure ring 60. Among them, the second exhaust passage 122 communicates with at least one pit.

[0088] The convex part 51 can not only achieve the interference fit between the pressure ring 60 and the first installation groove 504 of the upper insulating part 50, ensure the assembly stability between the pressure ring 60 and the upper insulating part 50, but also space the peripheral side surface 603 from the groove side wall surface 507 to ensure that a second exhaust passage 122 is formed between the peripheral side surface 603 and the groove side wall surface 507. During the assembly process of the pressure ring 60 and the upper insulating part 50, the first guiding surface 512 of the convex part 51 can guide the pressure ring 60 to be installed in the first installation groove 504, which helps to improve the assembly efficiency and assembly reliability of the pressure ring 60 and the upper insulating part 50. In addition, during the assembly process of the end cover assembly 120, the upper insulating part 50 can be first assembled with the pressure ring 60 and then assembled in the second installation groove 106 of the end cover 10 to save the assembly time of the end cover assembly 120 and improve the assembly efficiency of the end cover assembly 120.

[0089] In some other embodiments, the upper insulating member 50 may not be provided with the convex portion 51, and the pressing ring 60 is provided with a convex portion (not shown in the figure). The convex portion is provided on the circumferential side surface 603 of the pressing ring 60 and abuts against the groove side wall surface 507 of the upper insulating member 50, so as to form a second exhaust passage 122 between the circumferential side surface 603 and the groove side wall surface 507. At this time, the structure of the convex portion in the pressing ring 60 can refer to the relevant description of the convex portion 51 in the upper insulating member 50 above, and will not be elaborated here.

[0090] Each pressing ring 60 is provided with a third mounting hole 604 and a third limiting hole 605. The third mounting hole 604 is located in the middle of the pressing ring 60 and penetrates the pressing ring 60 along the thickness direction of the pressing ring 60. That is, the third mounting hole 604 penetrates the first surface 601 and the second surface 602 and is spaced from the circumferential side surface 603. Among them, the third mounting hole 604 communicates with the second mounting hole 503 and the first exhaust passage 121.

[0091] The opening of the third limiting hole 605 is located on the first surface 601. The third limiting hole 605 is recessed from the first surface 601 towards the second surface 602 and is spaced from the third mounting hole 604. Among them, there are multiple third limiting holes 605, and the multiple third limiting holes 605 are arranged at intervals around the third mounting hole 604 and communicate with the multiple second limiting holes 505 one by one. Exemplarily, there are six third mounting holes 604, and the six third mounting holes 604 are evenly arranged at intervals around the third mounting hole 604.

[0092] Each pole column 70 passes through a fourth mounting hole 202 of the lower insulating member 20, a first mounting hole 105 of the end cover 10, a second mounting hole 503 of an upper insulating member 50, and a third mounting hole 604 of a pressing ring 60, and is fixedly connected to the hole wall surface of a third mounting hole 604 of a pressing ring 60. Among them, each pole column 70 is fixedly connected to the hole wall surface of a third mounting hole 604 of a pressing ring 60 by welding.

[0093] During the welding process of the pressing ring 60 and the pole column 70, the gas between the pole column 70 and the pressing ring 60 will expand under the influence of high temperature, and the expanded gas can be discharged to the external environment along the first exhaust passage 121 and the second exhaust passage 122. The gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column 70 and the pressing ring 60, ensure the welding reliability between the pole column 70 and the pressing ring, and further ensure the assembly reliability of the end cover assembly 120.

[0094] Each sealing ring 80 is sleeved on a pole column 70 and is arranged in a fourth mounting hole 202 of the lower insulating part 20 and a first mounting hole 105 of the end cover 10, and is clamped between the circumferential surface of the pole column 70 and the hole wall surface of the first mounting hole 105 in the radial direction of the pole column 70. This can not only prevent short circuit caused by contact between the pole column 70 and the end cover 10, but also seal the gap between the pole column 70 and the end cover 10, ensuring the sealing reliability of the end cover assembly 120.

[0095] During the assembly process of the end cover assembly 120, the fourth mounting hole 202 of the lower plastic part can be aligned with the first mounting hole 105 of the end cover 10 first, and then the upper insulating part 50 assembled with the pressure ring 60 is installed in the second mounting groove 106 of the end cover 10. Then, the pole column 70 sleeved with the sealing ring 80 is sequentially passed through the fourth mounting hole 202 of the lower plastic part, the first mounting hole 105 of the end cover 10, the second mounting hole 503 of the upper insulating part 50, and the third mounting hole 604 of the pressure ring 60. Pressure is applied to the pole column 70 to squeeze the sealing ring 80, so that the sealing ring 80 is clamped between the pole column 70 and the hole wall of the first mounting hole 105. Finally, the pressure ring 60 is welded to the pole column 70.

[0096] The limiting posts 90 are respectively inserted into the second limiting holes 505 of the upper insulating part 50 one by one. One end of the limiting post 90 is inserted into the corresponding first limiting hole 107, and the other end is inserted into the corresponding third limiting hole 605. Exemplarily, the limiting post 90 can be a ceramic post made of ceramic. The design of the limiting post 90 can not only increase the assembly stability of the end cover assembly 120, but also improve the torsional strength of the pole column 70, improving the use reliability of the energy storage device 100. It should be understood that the number of the limiting posts 90 is not limited to Figure 4 the six shown. The limiting posts 90 can also have less than five or more than seven. The present application does not make specific limitations on this.

[0097] In this embodiment, the convex point 52 of the upper insulating part 50 abuts against the circumferential surface of the limiting post 90 to achieve interference fit between the limiting post 90 and the second limiting hole 505 of the upper insulating part 50, ensuring the assembly stability between the limiting post 90 and the upper insulating part 50. Among them, the second abutting surface 521 of the convex point 52 abuts against the circumferential surface of the limiting post 90. During the assembly process of the limiting post 90 and the upper insulating part 50, the second guiding surface 522 and the third guiding surface 523 of the convex point 52 can guide the limiting post 90 to pass through the second limiting hole 505, which helps to improve the assembly efficiency and assembly reliability of the limiting post 90 and the upper insulating part 50.

[0098] Please refer to Figure 3 and Figure 8 , Figure 8 which Figure 2 is a schematic structural diagram of the end cover assembly 120 shown in a partially cut-away view in the first embodiment.

[0099] Each connecting tab 130 is fixedly connected to the second surface 602 of a pressure ring 60. Specifically, each connecting tab 130 is fixedly connected to the second surface 602 of a pressure ring 60 by welding. In this embodiment, each of the pressure rings 60 has a welding portion 123. The welding portion 123 is fixedly connected between the connecting tab 130 and the pressure ring 60, is disposed around the pole column 70, and is spaced from the pole column 70. During the process of laser welding the connecting tab 130 and the pressure ring 60, a part of the connecting tab 130 and a part of the pressure ring 60 will melt and converge to form a molten pool, and the welding portion 123 is formed after the molten pool cools. At this time, an obvious laser welding bead can be observed on the surface of the connecting tab 130 facing away from the pressure ring 60.

[0100] Each of the upper insulating members 50 has a sealing portion 124. The sealing portion 124 is disposed on the bottom wall surface 506 of the groove, is disposed around the pole column 70, is spaced from the pole column 70, and is correspondingly disposed with the welding portion 123. It should be noted that the corresponding setting of the sealing portion 124 and the welding portion 123 means that the projection of the welding portion 123 on the bottom wall surface 506 covers at least a part of the sealing portion 124.

[0101] In this embodiment, the sealing portion 124 divides the first exhaust passage 121 into a first sub-exhaust passage 121a and a second sub-exhaust passage 121b. That is, the sealing portion 124 partitions the first exhaust passage 121 into a first sub-exhaust passage 121a and a second sub-exhaust passage 121b, and the first sub-exhaust passage 121a and the second sub-exhaust passage 121b are not communicated. At this time, the first surface 601 and the bottom wall surface 506 of the groove enclose the first sub-exhaust passage 121a and the second sub-exhaust passage 121b. The first sub-exhaust passage 121a communicates with the second mounting hole 503 and the third mounting hole 604. The second sub-exhaust passage 121b is spaced from the first sub-exhaust passage 121a in the radial direction of the pole column 70 and communicates with the second exhaust passage 122. Specifically, the sealing portion 124 is located between the first sub-exhaust passage 121a and the second sub-exhaust passage 121b and partitions the first sub-exhaust passage 121a and the second sub-exhaust passage 121b. Among them, the first sub-exhaust passage 121a has a first port 121c facing the sealing portion 124, and the second sub-exhaust passage 121b has a second port 121d facing the sealing portion 124. Along the length direction of the first sub-exhaust passage 121a, the projection of the first port 121c on the second sub-exhaust passage 121b covers at least a part of the second port 121d. Exemplarily, along the length direction of the first sub-exhaust passage 121a, the projection of the first port 121c on the second sub-exhaust passage 121b completely covers the second port 121d.

[0102] The sealing portion 124 can prevent water vapor in the external environment from entering the first sub-exhaust passage 121a through the second exhaust passage 122 and the second sub-exhaust passage 121b to erode the sealing ring 80, ensuring the sealing reliability of the end cap assembly 120 and increasing the service life of the energy storage device 100. Exemplarily, the sealing portion 124 is a closed circular bright surface on the bottom wall surface 506 of the groove.

[0103] During the welding process of connecting the connecting tab 130 and the pressure ring 60, the welding heat will be conducted through the pressure ring 60 to the bottom wall surface 506 of the upper insulating part 50. The protrusions on the bottom wall surface 506 will melt and collapse to fill the pits on the bottom wall surface 506, thereby forming the sealing portion 124 on the bottom wall surface 506. It can be understood that since the welding portion 123 is annular, an annular sealing portion 124 will also be formed on the bottom wall surface 506. Thus, the sealing portion 124 can prevent external water vapor from entering the interior of the energy storage device 100 and increase the service life of the energy storage device 100.

[0104] Before the connecting tab 130 and the pressure ring 60 are welded, the sealing portion 124 is not formed on the upper insulating part 50, and the first port 121c and the second port 121d are in communication. At this time, the first sub-exhaust passage 121a and the second sub-exhaust passage 121b are in communication. During the welding process of the pressure ring 60 and the pole column 70, the gas between the pole column 70 and the pressure ring 60 will expand under the influence of high temperature, and the expanded gas can be discharged to the external environment along the first exhaust passage 121 and the second exhaust passage 122. The gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column 70 and the pressure ring 60, ensuring the welding reliability between the pole column 70 and the pressure ring, and further ensuring the assembly reliability of the end cap assembly 120.

[0105] Please refer to Figures 9 to 11 , Figure 9 is Figure 2 the exploded structural schematic diagram of the end cap assembly 120 in the second embodiment, Figure 10 is Figure 9 the structural schematic diagram of the upper insulating part 50 in the end cap assembly 120 shown, Figure 11 is Figure 2 the structural schematic diagram of the end cap assembly 120 partially cut open in the second embodiment.

[0106] The difference between the end cap assembly 120 shown in this embodiment and the end cap assembly 120 shown in the first embodiment above is that the upper insulating member 50 is further provided with a plurality of exhaust grooves 508. The openings of the plurality of exhaust grooves 508 are all located on the groove bottom wall surface 506. The plurality of exhaust grooves 508 are recessed from the groove bottom wall surface 506 towards the sixth surface 502. The plurality of exhaust grooves 508 communicate with each other. At least one exhaust groove 508 communicates with the second mounting hole 503. At least one exhaust groove 508 communicates with the second exhaust passage 122. Exemplarily, the plurality of exhaust grooves 508 all communicate with the second exhaust passage 122. Among them, the plurality of exhaust grooves 508 include a plurality of first exhaust grooves 508a and a plurality of second exhaust grooves 508b. The plurality of first exhaust grooves 508a extend along the first direction D1 and are arranged at intervals along the second direction D2. The plurality of second exhaust grooves 508b extend along the second direction D2 and are arranged at intervals along the first direction D1. Exemplarily, the first direction D1 and the second direction D2 intersect. Among them, each second exhaust groove 508b communicates with at least one first exhaust groove 508a. In other words, a cross-shaped knurled groove is provided on the groove bottom wall surface 506 of the upper insulating member 50.

[0107] Specifically, the first surface 601 and the plurality of exhaust grooves 508 enclose a first exhaust passage 121. Among them, the first surface 601 and the plurality of first exhaust grooves 508a and the plurality of second exhaust grooves 508b enclose a first exhaust passage 121. The first exhaust passage 121 includes a plurality of first exhaust grooves 508a and a plurality of second exhaust grooves 508b. During the welding process of the pressure ring 60 and the pole column 70, the gas between the pole column 70 and the pressure ring 60 will expand under the influence of high temperature. The expanded gas can be discharged to the external environment along the first exhaust passage 121 and the second exhaust passage 122. The gas will not be discharged from the molten weld bead, which can avoid welding defects such as explosion points or pinholes at the welding position between the pole column 70 and the pressure ring 60, ensure the welding reliability between the pole column 70 and the pressure ring, and further ensure the assembly reliability of the end cap assembly 120. Moreover, the design of the exhaust groove 508 can increase the cross-sectional area of the first exhaust passage 121, increase the rate of gas discharged from the first exhaust passage 121 to the external environment, and help improve the welding efficiency of the pressure ring 60 and the pole column 70. Furthermore, the design of the first exhaust groove 508a and the second exhaust groove 508b can enable the gas to be discharged to the second exhaust passage 122 from multiple directions, which can further increase the rate of gas discharged from the first exhaust passage 121 to the external environment and improve the welding efficiency of the pressure ring 60 and the pole column 70.

[0108] During the welding process of connecting the bus bar piece 130 and the pressure ring 60, the welding heat will be conducted through the pressure ring 60 to the bottom wall surface 506 of the upper insulating member 50, and a part of the upper insulating member 50 will melt and collapse to fill the exhaust groove 508, thereby forming a sealing portion 124 on the bottom wall surface 506 of the groove. It can be understood that since the welding portion 123 is annular, an annular sealing portion 124 will also be formed on the bottom wall surface 506 of the groove, so that the sealing portion 124 can block external moisture from entering the interior of the energy storage device 100 and improve the service life of the energy storage device 100.

[0109] The present application also provides an electrical equipment, which includes the above-mentioned energy storage device 100, and the energy storage device 100 supplies power to the electrical equipment. Among them, the electrical equipment can be an electric vehicle, a power storage station, a server and other equipment that requires electricity.

[0110] The above description is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application; without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An end cap assembly for an energy storage device, characterized in that, It includes an end cover, an upper insulating member, a pressure ring and a pole; The end cover is provided with a first mounting hole, and the first mounting hole penetrates the end cover along the thickness direction of the end cover; The upper insulating member is mounted on one side of the end cover in the thickness direction of the end cover, and the upper insulating member is provided with a second mounting hole and a first mounting groove, the second mounting hole penetrates the upper insulating member in the thickness direction of the upper insulating member and is communicated with the first mounting hole, the opening of the first mounting groove is located on the surface of the upper insulating member away from the end cover, the first mounting groove is arranged around the second mounting hole, and is communicated with the second mounting hole, the first mounting groove has a groove bottom wall surface and a groove side wall surface, the groove bottom wall surface is arranged opposite to the opening of the first mounting groove and is a rough surface, and the groove side wall surface is connected to the groove bottom wall surface and is arranged around the groove bottom wall surface; The pressing ring is installed in the first installation groove, and the pressing ring has a first surface, a second surface and a peripheral side surface, the first surface faces the groove bottom wall surface, and is surrounded by the groove bottom wall surface to form a first exhaust channel, the first exhaust channel is connected to the second installation hole, the second surface is arranged opposite to the first surface, and the peripheral side surface is connected between the first surface and the second surface; In the first case, the upper insulating member is provided with a convex portion, which is provided on the groove side wall surface and abuts against the peripheral side surface to form a second exhaust channel between the groove side wall surface and the peripheral side surface; or, in the second case, the pressure ring is provided with a convex portion, which is provided on the peripheral side surface and abuts against the groove side wall surface to form a second exhaust channel between the peripheral side surface and the groove side wall surface; Wherein, the second exhaust channel is connected to the first exhaust channel and the external environment; The pressure ring is provided with a third mounting hole, the third mounting hole passes through the first surface and the second surface, and is communicated with the second mounting hole and the first exhaust channel; The pole is passed through the first mounting hole, the second mounting hole and the third mounting hole, and is fixed to the hole wall surface of the third mounting hole by welding.

2. The end cap assembly according to claim 1, wherein, The rough surface has a plurality of pits, the openings of the plurality of pits are all located on the bottom wall of the groove, the plurality of pits are connected to each other, at least one of the pits is connected to the second mounting hole, at least one of the pits is connected to the second exhaust channel, and the plurality of pits and the first surface enclose the first exhaust channel.

3. The end cap assembly according to claim 1, wherein, The upper insulating member is also provided with a plurality of exhaust grooves, the openings of the plurality of exhaust grooves are all located on the bottom wall of the groove, the plurality of exhaust grooves are connected to each other, at least one exhaust groove is connected to the second mounting hole, at least one exhaust groove is connected to the second exhaust channel, and the plurality of exhaust grooves and the first surface are enclosed to form the first exhaust channel.

4. The end cap assembly according to claim 3, wherein The first exhaust passage includes a plurality of first exhaust grooves and a plurality of second exhaust grooves. The plurality of first exhaust grooves extend in a first direction and are arranged at intervals in a second direction. The plurality of second exhaust grooves extend in the second direction and are arranged at intervals in the first direction. Each second exhaust groove communicates with at least one first exhaust groove, wherein the first direction intersects the second direction.

5. The end cap assembly according to any one of claims 1 to 4, characterized in that, The end cap assembly further includes a sealing ring. The sealing ring is sleeved on the pole column, disposed in the first mounting hole, and clamped between the pole column and the hole wall surface of the first mounting hole in the radial direction of the pole column.

6. The end cap assembly according to claim 1, wherein, The end cap is further provided with a plurality of first limiting holes. The openings of the first limiting holes face the upper insulating member. The plurality of first limiting holes are arranged around the first mounting hole and are spaced apart from the first mounting hole. The upper insulating member is further provided with a plurality of second limiting holes. The plurality of second limiting holes penetrate through the bottom wall surface of the groove and the surface of the upper insulating member facing the end cap. The plurality of second limiting holes are arranged around the second mounting hole and are spaced apart from the second mounting hole. The second limiting holes communicate with the first limiting holes in a one-to-one correspondence. The pressing ring is provided with a plurality of third limiting holes. The openings of the plurality of third limiting holes are located on the first surface, arranged around the third mounting hole, and spaced apart from the third mounting hole. The third limiting holes communicate with the second limiting holes in a one-to-one correspondence. The end cap assembly further includes a plurality of limiting posts. The limiting posts are respectively inserted into the second limiting holes in a one-to-one correspondence. One end of the limiting post is inserted into the corresponding first limiting hole, and the other end is inserted into the corresponding third limiting hole.

7. The end cap assembly according to claim 6, characterized in that, The upper insulating member is provided with bumps. The bumps are disposed on the hole wall surface of the second limiting hole and abut against the limiting posts.

8. The end cap assembly according to claim 7, characterized in that, There are a plurality of the bumps, and the plurality of bumps are arranged at intervals around the second limiting hole.

9. The end cap assembly according to claim 1, wherein There are a plurality of the convex portions, and the plurality of convex portions are arranged at intervals around the pressing block. The extending direction of the convex portions is parallel to the thickness direction of the end cap assembly.

10. A end cap assembly for an energy storage device, characterized in that, It includes an end cap, an upper insulating member, a pressing ring, and a pole column. The end cap is provided with a first mounting hole. The first mounting hole penetrates through the end cap along the thickness direction of the end cap. In the thickness direction of the end cap, the upper insulating member is mounted on one side of the end cap. The upper insulating member is provided with a second mounting hole and a first mounting groove. The second mounting hole penetrates through the upper insulating member along the thickness direction of the upper insulating member and communicates with the first mounting hole. The opening of the first mounting groove is located on the surface of the upper insulating member facing away from the end cap. The first mounting groove is arranged around the second mounting hole and communicates with the second mounting hole. The first mounting groove has a bottom wall surface and a side wall surface. The bottom wall surface is opposite to the opening of the first mounting groove and is a rough surface. The side wall surface is connected to the bottom wall surface and surrounds the bottom wall surface. The pressure ring is installed in the first installation groove. The pressure ring has a first surface, a second surface and a peripheral side surface. The first surface faces the bottom wall surface of the groove, and together with the bottom wall surface of the groove, a first sub-exhaust channel and a second sub-exhaust channel are formed. The first sub-exhaust channel is communicated with the second installation hole. The second sub-exhaust channel is arranged at a radial interval from the first sub-exhaust channel with respect to the pole column. The second surface is arranged opposite to the first surface. The peripheral side surface is connected between the first surface and the second surface; In the first case, the upper insulating part is provided with a convex part. The convex part is arranged on the side wall surface of the groove and abuts against the peripheral side surface to form a second exhaust channel between the side wall surface of the groove and the peripheral side surface; or, in the second case, the pressure ring is provided with a convex part. The convex part is arranged on the peripheral side surface and abuts against the side wall surface of the groove to form a second exhaust channel between the peripheral side surface and the side wall surface of the groove; Wherein, the second exhaust channel communicates the second sub-exhaust channel with the external environment; The pressure ring is provided with a third installation hole. The third installation hole penetrates through the first surface and the second surface and is communicated with the second installation hole and the first exhaust channel; The pressure ring has a welding part. The welding part is used for welding and fixing the pressure ring and the connecting tab and is arranged around the pole column; The upper insulating part has a sealing part. The sealing part is arranged on the bottom wall surface of the groove and is arranged around the pole column. The sealing part is located between the first sub-exhaust channel and the second sub-exhaust channel and separates the first sub-exhaust channel and the second sub-exhaust channel. Wherein, the projection of the welding part on the bottom wall surface of the groove covers at least part of the sealing part; The pole column passes through the first installation hole, the second installation hole and the third installation hole and is welded and fixed to the hole wall surface of the third installation hole.

11. The end cap assembly according to claim 10, characterized in that, The first sub-exhaust channel has a first port facing the sealing part. The second sub-exhaust channel has a second port facing the sealing part. Along the length direction of the first sub-exhaust channel, the projection of the first port on the second sub-exhaust channel covers at least part of the second port.

12. An energy storage device, characterized in that, It includes a housing, a battery cell assembly and an end cover assembly according to any one of claims 1 to 11. The housing is provided with a receiving cavity and an opening. The receiving cavity is arranged inside the housing. The opening is located on the top side of the receiving cavity and is communicated with the receiving cavity. The battery cell assembly is received in the receiving cavity. The end cover assembly is installed on the housing and closes the opening.

13. An electrical device, characterized in that, It includes an energy storage device according to claim 12. The energy storage device supplies power to the electrical equipment.

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