Lower insulation, end cover assembly, energy storage device and electrical equipment

Abstract

The present application provides a lower insulating member, an end cover assembly, an energy storage device, and an electrical device, which reduce the risk of fire in the energy storage device and improve the safety performance of the energy storage device. The lower insulating member includes a first surface and a second surface arranged opposite to each other; the lower insulating member is provided with a groove and a first air vent, the opening of the groove is located on the first surface, the groove includes a groove bottom wall arranged opposite to the opening of the groove, and the first air vent passes through the groove bottom wall and the second surface; the lower insulating member is provided with a first protective member and a second protective member, the first protective member is arranged on the groove bottom wall, and the cover is arranged on the first air vent, the first protective member includes a baffle and a side plate, the baffle is provided with a first through hole, the side plate is arranged around the first air vent and the baffle, and is connected between the baffle and the groove bottom wall; the second protective member is located on the side of the baffle facing the first air vent and is arranged opposite to the first through hole, the second protective member is provided with a connecting hole, and the projections of the second protective member and the baffle on the groove bottom wall jointly cover the first air vent.

Description

Technical Field

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

[0002] With the increasing application of energy storage devices, their safety performance has attracted considerable attention. When a device experiences thermal runaway, the explosion-proof valve opens to release pressure, causing high-temperature solids such as battery cells inside the device to splash out, potentially releasing combustible materials and potentially causing fires, posing a significant safety hazard. Summary of the Invention

[0003] The present application provides a lower insulating member, an end cover assembly, an energy storage device, and electrical equipment, which reduce the risk of fire in the energy storage device and improve the safety performance of the energy storage device.

[0004] The present application provides a lower insulating member for use in an end cap assembly, the lower insulating member comprising a first surface and a second surface, wherein along a thickness direction of the lower insulating member, the second surface is disposed opposite to the first surface;

[0005] The lower insulating member is provided with a groove and a first vent hole, the opening of the groove is located on the first surface, the groove includes a groove bottom wall surface, the groove bottom wall surface is arranged opposite to the groove opening, and the first vent hole passes through the groove bottom wall surface and the second surface;

[0006] The lower insulating member is provided with a protective cover, the protective cover comprising a first protective member and a second protective member, the first protective member being provided on the bottom wall of the groove and covering the first air vent, the first protective member comprising a baffle and a side plate, the baffle being located on a side of the first air vent away from the second surface, the baffle being provided with a first through hole, the first through hole penetrating the baffle along the thickness direction of the lower insulating member, the side plate being provided on the bottom wall of the groove and surrounding the first air vent and the baffle, and being connected between the baffle and the bottom wall of the groove;

[0007] The second protective member is located on the side of the baffle facing the first air vent, and is spaced apart from the baffle and opposite to the first through hole. The second protective member is provided with a connecting hole, which passes through the second protective member along the thickness direction of the second protective member and is connected with both the first through hole and the first air vent. The projections of the second protective member and the baffle on the bottom wall of the groove jointly cover the first air vent.

[0008] There are a plurality of first through holes, and the plurality of first through holes are spaced apart along the circumference of the baffle;

[0009] The second protective element includes a plurality of sub-protective elements, which are arranged at intervals along the circumference of the first vent hole, and each sub-protective element is arranged opposite to one of the first through holes.

[0010] In which, the protective cover also includes a support member, which is arranged around the sub-protective member and connected between the first protective member and the second protective member. The support member is provided with a second through hole, which passes through the support member along the thickness direction of the support member and is connected with the first air vent, the connecting hole and the first through hole, wherein the thickness direction of the support member is parallel to the first surface.

[0011] The side plate is provided with a third through hole, and the third through hole passes through the side plate along the thickness direction of the side plate and is communicated with the first through hole.

[0012] The baffle includes a third surface and a fourth surface, the third surface being the surface of the baffle facing away from the bottom wall of the groove, and the fourth surface being disposed opposite to the third surface along the thickness direction of the baffle;

[0013] The first through hole includes a first hole portion and a second hole portion. The second hole portion is located on the side of the first hole portion facing the third surface and is connected to the first hole portion. The cross-sectional area of the second hole portion gradually increases along the direction from the fourth surface to the third surface.

[0014] The baffle is further provided with a fourth through hole, which passes through the baffle along the thickness direction of the lower insulating member and is spaced apart from the first through hole. The projection of the fourth through hole on the bottom wall of the groove is staggered with the first air vent.

[0015] The side plate is provided with a fifth through hole, which passes through the side plate along the thickness direction of the side plate and is communicated with the fourth through hole.

[0016] The baffle includes a third surface and a fourth surface, the third surface being the surface of the baffle facing away from the bottom wall of the groove, and the fourth surface being disposed opposite to the third surface along the thickness direction of the baffle;

[0017] The fourth through hole includes a third hole portion and a fourth hole portion. The fourth hole portion is located on the side of the third hole portion facing the third surface and is connected to the third hole portion. The cross-sectional area of the fourth hole portion gradually increases along the direction from the fourth surface to the third surface.

[0018] Along the thickness direction of the side plate, the side plate includes a fifth surface away from the first air hole;

[0019] The baffle includes a first portion and a second portion, the first portion is disposed opposite to the first vent hole, and the first portion includes an upper surface disposed opposite to the opening of the groove;

[0020] The second part is fixedly connected between the first part and the side plate. The second part has an arcuate surface, and the arcuate surface is connected between the upper surface and the fifth surface.

[0021] Wherein, the groove further includes a groove side wall surface, the groove side wall surface is arranged around the groove bottom wall surface and connected between the groove bottom wall surface and the first surface;

[0022] The lower insulating member is further provided with a reinforcing rib, which is arranged on the bottom wall of the groove, connected to the side wall of the groove, and spaced apart from the protective cover.

[0023] The groove sidewall includes a first side surface and a second side surface, and along the length direction of the lower insulating member, the first side surface and the second side surface are spaced apart and arranged opposite to each other;

[0024] There are multiple reinforcing ribs, and the multiple reinforcing ribs include multiple first reinforcing ribs and multiple second reinforcing ribs. The multiple first reinforcing ribs are located on the side of the protective cover close to the first side surface, and are connected to the first side surface, and are arranged at intervals along the width direction of the lower insulating member. The multiple second reinforcing ribs are located on the side of the protective cover close to the second side surface, and are connected to the second side surface, and are arranged at intervals along the width direction of the lower insulating member.

[0025] Wherein, the thermal deformation temperature of the protective cover is greater than or equal to 200°C.

[0026] The present application also provides an end cap assembly, comprising the lower insulating member as described above, an end cap, and an explosion-proof valve, wherein the end cap is located on a side of the first surface facing away from the second surface, and the end cap is provided with an explosion-proof hole, which penetrates the end cap along the thickness direction of the end cap and is arranged opposite to the first protective member and the second protective member;

[0027] The explosion-proof valve is installed on the end cover and covers the explosion-proof hole.

[0028] The present application also provides an energy storage device, which includes a shell, a battery cell assembly and the end cover assembly described above. The shell is provided with a receiving cavity and an opening. The receiving cavity is located on the inner side of the shell and contains electrolyte. The opening is located on the top side of the receiving cavity and is connected to the receiving cavity. The battery cell assembly is received in the receiving cavity. The end cover assembly is installed on the shell, closes the opening, and is electrically connected to the battery cell assembly.

[0029] The present application also provides an electrical device, comprising the energy storage device described above, wherein the energy storage device is used to supply power to the electrical device.

[0030] This application incorporates a protective shield within the lower insulating member. This shield can completely block the high-temperature solids ejected from the energy storage device during thermal runaway, preventing the release of combustible materials from the device, thereby reducing the risk of fire and improving the device's safety. Furthermore, high-temperature, high-pressure gases generated within the device can be discharged through the first vent and the first through hole to the bottom of the explosion-proof valve, and then discharged to the exterior of the device as the explosion-proof valve opens, ensuring the device's exhaust performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0032] Figure 1 This is a schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0033] Figure 2 yes Figure 1 A schematic structural diagram of an end cap assembly of the energy storage device shown;

[0034] Figure 3 yes Figure 2 A schematic diagram of the exploded structure of the first end cap assembly is shown;

[0035] Figure 4 yes Figure 2 The schematic diagram of the structure of the first end cover assembly after being cut along AA;

[0036] Figure 5 yes Figure 4 A partial enlarged view of area a in the end cap assembly shown;

[0037] Figure 6 yes Figure 3 A schematic structural diagram of the lower insulating member in the end cap assembly shown at another angle;

[0038] Figure 7 yes Figure 6 A schematic structural diagram of the lower insulating member shown at another angle;

[0039] Figure 8 yes Figure 7 A partial enlarged view of area b in the lower insulating member shown;

[0040] Figure 9 yes Figure 7 a top view of the lower insulating member shown;

[0041] Figure 10 yes Figure 9A partial enlarged view of area c in the lower insulating member shown;

[0042] Figure 11 yes Figure 8 A partial enlarged view of area d in the lower insulating member shown;

[0043] Figure 12 yes Figure 11 A schematic diagram of the partial structure of the lower insulating member shown cut along point II;

[0044] Figure 13 yes Figure 8 A partial enlarged view of area e in the lower insulating member shown;

[0045] Figure 14 yes Figure 13 The schematic diagram of the local structure of the lower insulating member cut along GG is shown;

[0046] Figure 15 yes Figure 10 A partial plan view of the lower insulating member cut along CC is shown;

[0047] Figure 16 yes Figure 6 A partial enlarged view of region f in the lower insulating member is shown;

[0048] Figure 17 yes Figure 9 The schematic diagram of the structure of the lower insulating member is shown cut along BB;

[0049] Figure 18 yes Figure 17 A partial enlarged view of area g in the lower insulating member shown;

[0050] Figure 19 yes Figure 2 The diagram shows a partial plan view of the lower insulating member of the second end cap assembly cut along CC.

[0051] : Reference numerals: energy storage device 1000, housing 2000, end cover assembly 3000, opening 2001, lower insulator 100, end cover 200, explosion-proof valve 300, protective sheet 400, pole 500, upper insulator 600, sealing ring 700, first surface 101, second surface 102, third peripheral side surface 108, first surface 103, second surface 104, raised surface 105, third surface 106, fourth surface 107, groove 120, groove bottom wall 121, connecting surface h, groove side wall 122, first side surface 122a, second side surface 122b, first bottom surface 121a, second bottom surface 121b, first air vent 140, second air vent 131, third air vent 132, first pole hole 150, first liquid injection hole 160, protective cover D, first protective member 1 80, second protective member Q, support member 192, baffle 181, side plate 182, third surface 181a, fourth surface 181b, first peripheral side surface 181c, first through hole 20, fourth through hole 25, first hole portion 20a, second hole portion 20b, third hole portion 25a, fourth hole portion 25b, fifth surface 182a, sixth surface 182b, third through hole 30, fifth through hole 40, connecting hole Q1, sub-protective member 191, seventh surface 192a, eighth surface 192b, second through hole 193, reinforcing rib 70, reinforcing surface 71, first reinforcing rib 72, second reinforcing rib 73, explosion-proof hole 210, second pole hole 220, second liquid injection hole 230, first portion 181K, second portion 181F, upper surface 181K1, arcuate surface 181F1. DETAILED DESCRIPTION

[0052] 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.

[0053] See also Figure 1 , Figure 1 Schematic diagram of the structure of the energy storage device 1000 provided in an embodiment of the present application.

[0054] This application provides an energy storage device 1000. Energy storage device 1000 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. The energy storage device provided in the embodiments of this application may be, but is not limited to, the products listed above, or may be implemented in other forms. This embodiment of this application does not impose strict limitations on the application form of energy storage device 1000. This embodiment of this application uses a prismatic battery as an example for illustration.

[0055] The energy storage device 1000 includes a shell 2000, a battery cell assembly (not shown) and an end cap assembly 3000. The shell 2000 is provided with a receiving cavity (not shown) and an opening 2001. The receiving cavity is located on the inner side of the shell 2000 and contains an electrolyte. The opening 2001 is located on the top side of the receiving cavity and is connected to the receiving cavity. The shell 2000 can be made of aluminum. For example, the shell 2000 can be an aluminum shell. The battery cell assembly is accommodated in the receiving cavity. The battery cell assembly can be immersed in the electrolyte. The end cap assembly 3000 is installed on the shell 2000, closes the opening 2001, and is electrically connected to the battery cell assembly.

[0056] See also Figures 2 to 5 , Figure 2 yes Figure 1 The schematic structural diagram of the end cap assembly 3000 of the energy storage device 1000 is shown in FIG. Figure 3 yes Figure 2 The exploded structural diagram of the first end cap assembly 3000 is shown. Figure 4 yes Figure 2 The schematic structural diagram of the first end cap assembly 3000 after being cut along AA is shown. Figure 5 yes Figure 4 A partial enlarged view of area a in the end cap assembly 3000 is shown.

[0057] The end cap assembly 3000 includes a lower insulator 100, an end cap 200, an explosion-proof valve 300, a protective sheet 400, a terminal post 500, an upper insulator 600, and a sealing ring 700. Along the thickness of the end cap assembly 3000, the end cap 200 is located on one side of the lower insulator 100. The explosion-proof valve 300 and the protective sheet 400 are both mounted on the end cap 200. Along the thickness of the end cap assembly 3000, a terminal post 500 passes through the end cap 200 and the lower insulator 100. There are two terminal posts 500, spaced apart along the length of the end cap assembly 3000. One terminal post 500 serves as the positive electrode, and the other serves as the negative electrode. The upper insulator 600 is mounted between the terminal post 500 and the end cap 200. There are two upper insulators 600, each mounted between a terminal post 500 and the end cap 200. One upper insulator 600 serves as a positive electrode insulator and is installed between the positive electrode post and the end cap 200. Another upper insulator 600 serves as a negative electrode insulator and is installed between the negative electrode post and the end cap 200. A sealing ring 700 is sleeved on the upper insulator 600 and clamped between the end cap 200 and the post 500. There are two sealing rings 700, each of which is sleeved on an upper insulator 600 and clamped between the end cap 200 and a post 500. One sealing ring 700 serves as a positive electrode sealing ring and is sleeved on the positive electrode insulator and clamped between the end cap 200 and the positive electrode post. The other sealing ring 700 serves as a negative electrode sealing ring and is sleeved on the negative electrode insulator and clamped between the end cap 200 and the negative electrode post.

[0058] See also Figure 6 , Figure 6 yes Figure 3 The structure diagram of the lower insulating member 100 in the end cap assembly 3000 is shown at another angle.

[0059] The lower insulating member 100 includes a first surface 101, a second surface 102, and a third peripheral side surface 108. Along the thickness direction of the lower insulating member 100, the second surface 102 is arranged opposite to the first surface 101. The second surface 102 includes a raised surface 105, a first surface 103, a second surface 104, a third surface 106, and a fourth surface 107. Along the length direction of the lower insulating member 100, the raised surface 105 is located in the middle of the second surface 102, and the first surface 103 and the second surface 104 are respectively located on opposite sides of the raised surface 105 and are spaced apart from the raised surface 105. Among them, the first surface 103 and the second surface 104 are both located on the side of the raised surface 105 close to the first surface 101. The third surface 106 is connected between the raised surface 105 and the first surface 103. The fourth surface 107 is arranged opposite to the third surface 106 and is connected between the raised surface 105 and the second surface 104. The third peripheral side surface 108 is connected between the first surface 101 and the second surface 102 .

[0060] Please also refer to Figure 7 and Figure 8 , Figure 7 yes Figure 6 The schematic structural diagram of the lower insulating member 100 at another angle is shown. Figure 8 yes Figure 7 A partial enlarged view of area b in the lower insulating member 100 is shown.

[0061] The lower insulating member 100 is provided with a groove 120. Along the length direction of the lower insulating member 100, the groove 120 is located in the middle of the lower insulating member 100 and is spaced apart from the third circumferential side surface 108. The opening of the groove 120 is located on the first surface 101. The groove 120 is recessed from the first surface 101 toward the second surface 102. The groove 120 is recessed from the first surface 101 toward the raised surface 105 and is arranged corresponding to the raised surface 105. It should be noted that the groove 120 is arranged corresponding to the raised surface 105, which means that the projection of the groove 120 on the second surface 102 covers at least a portion of the raised surface 105.

[0062] The groove 120 includes a groove bottom wall 121, two connecting surfaces h, and a groove side wall 122. The groove bottom wall 121 is arranged opposite to the opening of the groove 120 and is arranged opposite to the raised surface 105. The groove bottom wall 121 includes a first bottom surface 121a and two second bottom surfaces 121b. Along the width direction of the lower insulating member 100, the first bottom surface 121a is located in the middle of the groove bottom wall 121, and the two second bottom surfaces 121b are respectively located on opposite sides of the first bottom surface 121a. Among them, the two second bottom surfaces 121b are both located on the side of the first bottom surface 121a away from the first surface 101. Along the width direction of the lower insulating member 100, the two connecting surfaces h are respectively located on opposite sides of the first bottom surface 121a and are both connected to the first bottom surface 121a. Specifically, one connecting surface h is connected between the first bottom surface 121 a and one second bottom surface 121 b , and the other connecting surface h is connected between the first bottom surface 121 a and the other second bottom surface 121 b .

[0063] The groove sidewall 122 surrounds the groove bottom wall 121 and connects between the groove bottom wall 121 and the first surface 101. It is also connected to both connection surfaces h. Specifically, the groove sidewall 122 includes a first side surface 122a and a second side surface 122b. Along the length of the lower insulator 100, the first side surface 122a and the second side surface 122b are spaced apart and disposed opposite each other. Both connection surfaces h are connected between the first side surface 122a and the second side surface 122b.

[0064] The lower insulating member 100 is further provided with a first air vent 140, a second air vent 131, a third air vent 132, a first pole hole 150, and a first liquid injection hole 160. Along the thickness direction of the lower insulating member 100, the first air vent 140 extends through the groove bottom wall 121 and the second surface 102, and is spaced apart from the groove side wall 122. Specifically, the first air vent 140 extends through the first bottom surface 121a and the raised surface 105. There are two first air vents 140, spaced apart along the width direction of the lower insulating member 100. In other embodiments, there may be one, three, or more first air vents 140, and this application is not limited thereto.

[0065] When thermal runaway occurs in the energy storage device 1000, the airflow inside the energy storage device 1000 can reach the area below the explosion-proof valve 300 through the first air vent 140, and then be discharged to the outside of the energy storage device 1000 as the explosion-proof valve 300 opens, thereby achieving timely exhaust of the energy storage device 1000 and improving the safety performance of the energy storage device 1000.

[0066] Along the thickness of the lower insulator 100, the second air holes 131 extend through the groove bottom wall 121 and the second surface 102, and are spaced apart from the groove sidewalls 122. Specifically, the second air holes 131 extend through the second bottom surface 121b and the raised surface 105. There are multiple second air holes 131, and these multiple second air holes 131 are spaced apart. Along the width of the end cap assembly 3000, some second air holes 131 are located on one side of the first air hole 140 and extend through one second bottom surface 121b, while another portion of the second air holes 131 is located on the other side of the first air hole 140 and extends through the other second bottom surface 121b.

[0067] The third ventilation holes 132 extend through the groove sidewall 122 and the second surface 102. There are multiple third ventilation holes 132, and they are spaced apart. Along the length of the lower insulating member 100, a portion of the third ventilation holes 132 is located on one side of the first ventilation hole 140, extends through the first side surface 122a and the third surface 106, and is spaced apart along the width of the lower insulating member 100. Another portion of the third ventilation holes 132 is located on the other side of the first ventilation hole 140, extends through the second side surface 122b and the fourth surface 107, and is spaced apart along the width of the lower insulating member 100.

[0068] The provision of second and third vents 131, 132 improves the exhaust performance of energy storage device 1000. When thermal runaway occurs, airflow within device 1000 can reach the area below explosion-proof valve 300 through first, second, and third vents 140, 131, and 132. Airflow then flows out of device 1000 after explosion-proof valve 300 opens, accelerating exhaust from device 1000 and improving its safety.

[0069] Along the thickness direction of the lower insulating member 100, the first pole hole 150 and the first liquid injection hole 160 both penetrate the lower insulating member 100. That is, the first pole hole 150 and the first liquid injection hole 160 both penetrate the first surface 101 and the second surface 102. Along the length direction of the lower insulating member 100, the first pole hole 150 is located on one side of the groove 120 and is spaced apart from the groove 120. There are two first pole holes 150. Along the length direction of the lower insulating member 100, the two first pole holes 150 are located on opposite sides of the groove 120, respectively. The first liquid injection hole 160 is located between the groove 120 and one of the first pole holes 150, and is spaced apart from both the raised surface 105 and the first pole hole 150.

[0070] Please also refer to Figure 9 and Figure 10 , Figure 9 Yes Figure 7 The top view of the lower insulating member 100 is shown, Figure 10 yes Figure 9 A partial enlarged view of area c in the lower insulating member 100 is shown.

[0071] The lower insulator 100 is also equipped with a protective cover D. The protective cover D is located on the bottom wall 121 of the groove, spaced apart from the side walls 122, and corresponding to the first ventilation holes 140. It should be noted that the protective cover D corresponding to the first ventilation holes 140 means that the projection of the protective cover D on the first bottom wall 121 at least partially covers the first ventilation holes 140. The protective cover D is located on the first bottom surface 121a, between the first side surface 122a and the second side surface 122b. Specifically, the protective cover D is located on the side of the first surface 101 closest to the second surface 102. That is, the protective cover D does not protrude relative to the first surface 101, ensuring smooth assembly between the lower insulator 100 and the end cap 200 and improving the assembly stability of the end cap assembly 3000. Two protective covers D are provided. They are spaced apart along the width of the lower insulator 100, each corresponding to a first ventilation hole 140.

[0072] In this embodiment, each protective cover D includes a first protective member 180, a second protective member Q and a support member 192. The first protective member 180 is provided on the bottom wall surface 121 of the groove, and the cover is provided on the first air vent 140. Specifically, the first protective member 180 is provided on the first bottom surface 121a and is spaced apart from the side wall surface 122 of the groove. The first protective member 180 includes a baffle 181 and a side plate 182. The baffle 181 is located on the side of the first air vent 140 away from the second surface 102, and is spaced apart from the bottom wall surface 121 of the groove, and is provided corresponding to the first air vent 140. It should be noted that the baffle 181 is provided corresponding to the first air vent 140, which means that the projection of the baffle 181 on the lower insulating member 100 will at least cover a portion of the first air vent 140. The baffle 181 includes a third surface 181a, a fourth surface 181b and a first peripheral side surface 181c. The third surface 181a is the surface of the baffle 181 facing away from the groove bottom wall 121 and is located on the side of the first surface 101 closer to the second surface 102. Along the thickness direction of the baffle 181, the fourth surface 181b is disposed opposite the third surface 181a and is located between the groove bottom wall 121 and the third surface 181a, and is spaced apart from the groove bottom wall 121. The first circumferential side surface 181c is connected between the third surface 181a and the fourth surface 181b. The first circumferential side surface 181c is located on the side of the hole wall of the first air vent 140 away from the first air vent 140. In other embodiments, the first circumferential side surface 181c may be flush with the hole wall of the first air vent 140. Exemplarily, the baffle 181 is gear-shaped.

[0073] Please continue reading Figure 8 , the baffle 181 is provided with a first through hole 20 and a fourth through hole 25. The first through hole 20 and the fourth through hole 25 both penetrate the baffle 181 along the thickness direction of the lower insulating member 100, and are spaced apart from each other. Specifically, the first through hole 20 and the fourth through hole 25 both penetrate the third surface 181a, the fourth surface 181b and the first circumferential side surface 181c. Among them, there are multiple first through holes 20 and multiple fourth through holes 25. The multiple first through holes 20 and the multiple fourth through holes 25 are all spaced apart along the circumference of the baffle 181, and are staggered along the circumference of the baffle 181 to improve the exhaust performance of the energy storage device 1000. In some other embodiments, the first through hole 20 and / or the fourth through hole 25 may not penetrate the first circumferential side surface 181c, and this application does not limit this.

[0074] See also Figure 11 and Figure 12 , Figure 11 yes Figure 8 A partial enlarged view of area d in the lower insulating member 100 is shown. Figure 12 yes Figure 11 The lower insulating member 100 is shown as a schematic diagram of a partial structure cut along line II.

[0075] In this embodiment, each first through hole 20 is disposed correspondingly to the first air vent 140. It should be noted that "each first through hole 20 is disposed correspondingly to the first air vent 140" means that the projection of each first through hole 20 on the first groove bottom wall 121 overlaps at least partially with the first air vent 140. Each first through hole 20 includes a first hole portion 20a and a second hole portion 20b. The second hole portion 20b is located on the side of the first hole portion 20a closer to the third surface 181a and is connected to the first hole portion 20a. The cross-sectional area of the second hole portion 20b gradually increases along the direction from the fourth surface 181b to the third surface 181a. The curved wall surface of the second hole portion 20b not only prevents the wall surface of the second hole portion 20b from forming a right angle with the third surface 181a and thereby scratching the explosion-proof valve 300, but also prevents the airflow from striking the right angle when entering the first through hole 20 from the first vent 140, thereby facilitating the flow of air within the energy storage device 1000 and converging it to the area below the explosion-proof valve 300. For example, the first through hole 20 is in the shape of a long waist trapezoid.

[0076] Please also refer to Figure 13 , Figure 13 yes Figure 8 A partial enlarged view of region e in the lower insulating member 100 is shown.

[0077] The projection of each fourth through hole 25 on the bottom wall 121 of the tank is offset from the first vent 140. This prevents high-temperature solids within the energy storage device 1000 from being ejected through the fourth through holes 25 in the event of thermal runaway. This reduces the risk of fire in the energy storage device 1000 and improves the safety of the energy storage device 1000. It should be noted that the offsetting of the projection of the fourth through hole 25 on the bottom wall 121 of the tank from the first vent 140 means that the projection of the fourth through hole 25 on the bottom wall 121 of the tank does not overlap with the first vent 140.

[0078] Please also refer to Figure 14 , Figure 14 yes Figure 13 The lower insulating member 100 is shown as a schematic diagram of a partial structure cut along GG.

[0079] Each fourth through hole 25 includes a third hole portion 25a and a fourth hole portion 25b. The fourth hole portion 25b is located on the side of the third hole portion 25a facing the third surface 181a and connects the third hole portion 25a with the first air vent 140. The cross-sectional area of the fourth hole portion 25b gradually increases along the direction from the fourth surface 181b to the third surface 181a. The hole wall surfaces of the fourth hole portions 25b are all curved. This not only prevents the hole wall surfaces of the fourth hole portions 25b from forming a right angle with the third surface 181a and scratching the explosion-proof valve 300, but also prevents the internal airflow of the energy storage device 1000 from hitting the right angle when entering the fourth through hole 25 from the first air vent 140 and generating vortices when thermal runaway occurs. This helps to guide the airflow within the energy storage device 1000 to the area below the explosion-proof valve 300.

[0080] Please continue reading Figure 8 and Figure 15 , Figure 15 yes Figure 10 The lower insulating member 100 is shown as a partial plan view taken along CC.

[0081] The side plate 182 is provided on the bottom wall surface 121 of the groove, and is arranged around the first air vent 140 and the baffle 181, and is fixedly connected between the baffle 181 and the bottom wall surface 121 of the groove. In this embodiment, the side plate 182 and the baffle 181 are in an "L"-shaped structure. Among them, the side plate 182 is connected between the fourth surface 181b and the first bottom surface 121a. Specifically, the side plate 182 includes a fifth surface 182a and a sixth surface 182b. The fifth surface 182a and the sixth surface 182b are both connected between the fourth surface 181b and the bottom wall surface 121 of the groove. Along the thickness direction of the side plate 182, the fifth surface 182a is the surface of the side plate 182 away from the first air vent 140, and the sixth surface 182b is arranged opposite to the fifth surface 182a. Illustratively, the fifth surface 182a is flush with the first peripheral side surface 181c, and the sixth surface 182b is flush with the hole wall surface of the first air hole 140. In other embodiments, the fifth surface 182a may not be flush with the first peripheral side surface 181c, and / or the sixth surface 182b may not be flush with the hole wall surface of the first air hole 140, and this application is not limited to this.

[0082] Please continue reading Figure 11 and Figure 13, the side plate 182 is provided with a third through hole 30 and a fifth through hole 40. The third through hole 30 and the fifth through hole 40 both penetrate the side plate 182 along the thickness direction of the side plate 182 and are spaced apart from each other. Specifically, the third through hole 30 and the fifth through hole 40 both penetrate the fifth surface 182a and the sixth surface 182b. The third through hole 30 is connected to the first through hole 20. The fifth through hole 40 is connected to the fourth through hole 25. There are multiple third through holes 30 and multiple fifth through holes 40. The multiple third through holes 30 and the multiple fifth through holes 40 are spaced apart along the circumference of the side plate 182 and are staggered along the circumference of the side plate 182. Each third through hole 30 is connected to a first through hole 20. Exemplarily, the hole wall surface of each third through hole 30 is flush with the hole wall surface of the first hole portion 20a in a first through hole 20. In some other embodiments, the side plate 182 may not be provided with the third through hole 30 , and this application does not impose any limitation on this.

[0083] Each fifth through hole 40 is connected to a fourth through hole 25 and the first vent hole 140. For example, the wall surface of each fifth through hole 40 is flush with the wall surface of the third hole portion 25a of a fourth through hole 25. In other embodiments, the side plate 182 may not be provided with the fifth through hole 40, and this application is not limited thereto.

[0084] When thermal runaway occurs in the energy storage device 1000, the gas inside the energy storage device 1000 can quickly reach the bottom of the explosion-proof valve 300 through the third through hole 30 and the fifth through hole 40, thereby increasing the exhaust channel of the energy storage device 1000 and thereby increasing the exhaust speed of the energy storage device 1000, thereby improving the safety performance of the energy storage device 1000.

[0085] See also Figures 16 to 18 , Figure 16 yes Figure 6 A partial enlarged view of the region f in the lower insulating member 100 is shown. Figure 17 yes Figure 9 The schematic structural diagram of the lower insulating member 100 cut along BB is shown. Figure 18 yes Figure 17 A partial enlarged view of region g in the lower insulating member 100 is shown.

[0086] The second protective member Q is located on the side of the baffle 181 facing the first air vent 140, and is spaced apart from the baffle 181 and opposite to the first through hole 20. Specifically, the second protective member Q is provided on the wall surface of the first air vent 140. The second protective member Q is provided with a connecting hole Q1. The connecting hole Q1 passes through the second protective member Q along the thickness direction of the second protective member Q, and is connected to both the first through hole 20 and the first air vent 140, so that the internal gas of the energy storage device 1000 can flow in from the connecting hole Q1 and the first air vent 140, and then flow to the explosion-proof valve 300 through the first through hole 20. There are multiple connecting holes Q1, and the multiple connecting holes Q1 are spaced apart along the circumference of the first air vent 140. Each connecting hole Q1 is connected to both a first through hole 20 and a first air vent 140.

[0087] The second protective element Q includes a plurality of sub-protective elements 191 , which are spaced apart along the circumference of the first vent hole 140 . A connecting hole Q1 is provided between every two sub-protective elements 191 . Each sub-protective element 191 is disposed opposite to a first through hole 20 .

[0088] In this embodiment, the projections of the second protective member Q and the baffle 181 on the bottom wall 121 of the groove jointly cover the first vent 140. Specifically, the projections of the multiple sub-protective members 191 and the baffle 181 on the bottom wall 121 jointly cover the first vent 140. Exemplarily, the sub-protective members 191 are in the shape of a long trapezoid. The trapezoidal structure of the multiple sub-protective members 191 complements the gear-like structure of the baffle 181, resulting in the first protective member 180 and the second protective member Q appearing completely enclosed in a top view of the lower insulator 100. This ensures that, in the event of thermal runaway of the energy storage device 1000, the baffle 181 and the second protective member Q can completely block the ejection of high-temperature solids from the interior of the energy storage device 1000, preventing combustible materials from being drawn out of the energy storage device 1000, thereby reducing the risk of fire and improving the safety of the energy storage device 1000. In some other embodiments, the baffle 181 and the sub-protection member 191 may be in other shapes, which is not limited in this application.

[0089] It should be noted that when the energy storage device 1000 experiences thermal runaway, the vast majority of high-temperature solids within the energy storage device 1000 will be ejected from the first air vents 140 corresponding to the explosion-proof valve 300, and a very small portion of the high-temperature solids will be ejected from the second air vents 131. In the energy storage device 1000 provided in this embodiment, since the projections of the baffle 181 and the second protective member Q on the tank bottom wall 121 jointly cover the first air vents 140, the baffle 181 and the second protective member Q can block the vast majority of the high-temperature solids from being ejected from the first air vents 140. Therefore, it is equivalent to the baffle 181 and the second protective member Q being able to "completely block" the high-temperature solids ejected from the energy storage device 1000.

[0090] Please continue reading Figure 8 and Figure 18 , the support member 192 is arranged around the sub-protective member 191 and is fixedly connected between the first protective member 180 and the second protective member Q. Specifically, the support member 192 is fixedly connected between the sub-protective member 191 and the baffle 181. The support member 192 is fixedly connected between the fourth surface 181b and the peripheral side surface of the sub-protective member 191. The thickness direction of the support member 192 is parallel to the first surface 101 and the second surface 102. The support member 192 includes a seventh surface 192a and an eighth surface 192b. The seventh surface 192a is fixedly connected between the fourth surface 181b and the second protective member Q. Along the thickness direction of the support member 192, the eighth surface 192b is arranged opposite to the seventh surface 192a. The eighth surface 192b is fixedly connected to the fourth surface 181b. There are multiple support members 192, and each support member 192 is connected between a sub-protective member 191 and the baffle 181.

[0091] Each support member 192 is provided with a second through-hole 193. This second through-hole 193 is located on one side of the sub-protective member 191 and extends through the thickness of the support member 192. It communicates with the first vent 140, the communication hole Q1, and the first through-hole 20. Specifically, the second through-hole 193 extends through the seventh surface 192a and the eighth surface 192b. In other embodiments, there may be multiple second through-holes 193, each of which is spaced apart.

[0092] The provision of support member 192 securely supports first protective member 180 and second protective member Q, ensuring good structural stability and mechanical strength of protective cover D. This helps shield D block high-temperature solids ejected from the interior of energy storage device 1000 in the event of thermal runaway, preventing combustible materials within energy storage device 1000 from being drawn out of the device 1000. This reduces the risk of fire in energy storage device 1000 and improves the safety of energy storage device 1000. Furthermore, the provision of second through-hole 193 creates a horizontal airflow channel between baffle 181 and second protective member Q, allowing for smooth airflow within energy storage device 1000 and ensuring good exhaust performance.

[0093] When the energy storage device 1000 experiences thermal runaway, airflow within it can enter between the first protective member 180 and the second protective member Q through the first vent 140, then flow through the second through-hole 193 into the first through-hole 20 and the fourth through-hole 25, ultimately flowing below the explosion-proof valve 300. Airflow within the energy storage device 1000 can also flow in through the first vent 140, then out through the third through-hole 30 and the fifth through-hole 40 to below the explosion-proof valve 300. After the explosion-proof valve 300 opens, the airflow below the explosion-proof valve 300 can be discharged to the exterior of the energy storage device 1000, thereby improving the safety performance of the energy storage device 1000.

[0094] In this embodiment, the protective cover D is made of a heat-resistant material. The heat deformation temperature of the heat-resistant material is greater than or equal to 200°C, which can ensure that the protective cover D has good heat-resistant deformation resistance. The protective cover D can still remain unchanged in a high-temperature environment to block the high-temperature solid ejected from the inside of the energy storage device 1000, reduce the risk of fire in the energy storage device 1000, and improve the safety performance of the energy storage device 1000. Exemplarily, the protective cover D is made of ceramics and other materials. In some other embodiments, the protective cover D can be made of metals such as aluminum, or the protective cover D can be made of polymer materials such as polytetrafluoroethylene, or the protective cover D can also be made of inorganic materials such as glass fiber, or the protective cover D can also be made of composite heat-resistant materials, wherein the composite heat-resistant materials can be prepared by processes such as heat-resistant plating or doping.

[0095] Please continue reading Figure 8 , the lower insulating member 100 is further provided with a reinforcing rib 70. The reinforcing rib 70 is provided on the bottom wall 121 of the groove, and is fixedly connected to the side wall 122 of the groove, and is spaced apart from the protective cover D. Specifically, the reinforcing rib 70 is provided on the first bottom surface 121a. The reinforcing rib 70 includes a reinforcing surface 71. The reinforcing surface 71 is connected between the side wall 122 of the groove and the bottom wall 121 of the groove. Along the direction of the side wall 122 of the groove toward the first air vent 140, the distance between the reinforcing surface 71 and the bottom wall 121 of the groove gradually decreases. Exemplarily, the reinforcing rib 70 has a triangular structure. The reinforcing rib 70 is set as a triangular structure, which not only ensures that the reinforcing rib 70 has good structural stability, but also reduces the manufacturing cost of the reinforcing rib 70.

[0096] Among them, there are multiple reinforcing ribs 70. The multiple reinforcing ribs 70 are arranged at intervals. Specifically, the multiple reinforcing ribs 70 include multiple first reinforcing ribs 72 and multiple second reinforcing ribs 73. The multiple first reinforcing ribs 72 are located on the side of the protective cover D close to the first side surface 122a, and are all fixedly connected between the first side surface 122a and the groove bottom wall surface 121, and are arranged at intervals along the width direction of the lower insulating member 100. The multiple second reinforcing ribs 73 are located on the side of the protective cover D close to the second side surface 122b, and are all fixedly connected between the second side surface 122b and the groove bottom wall surface 121, and are arranged at intervals along the width direction of the lower insulating member 100. Exemplarily, along the length direction of the lower insulating member 100, each second reinforcing rib 73 is arranged opposite to a first reinforcing rib 72, so that the reinforcing ribs 70 of the lower insulating member 100 are evenly distributed, further improving the stability of the structure between the groove bottom wall surface 121 and the groove side wall surface 122.

[0097] The provision of the reinforcing ribs 70 can enhance the structural strength of the groove 120, and prevent the groove bottom wall 121 and the groove side wall 122 from being deformed or broken during the movement of the energy storage device 1000, thereby ensuring that the protective cover D does not undergo extrusion deformation and breakage, ensuring the structural stability of the lower insulating member 100, and improving the safety performance of the energy storage device 1000.

[0098] See also Figure 19 , Figure 19 yes Figure 2 The diagram is a partial plan view of the lower insulating member 100 in the second end cap assembly 3000 cut along CC.

[0099] The difference between this embodiment and the first embodiment is that the baffle 181 includes a first portion 181K and a second portion 181F. The first portion 181K is arranged opposite to the first air vent 140. The first portion 181K includes an upper surface 181K1. The upper surface 181K1 is arranged opposite to the opening of the groove 120. The second portion 181F is fixedly connected between the first portion 181K and the side plate 182. The second portion 181F is arc-shaped. Specifically, the second portion 181F has an arc-shaped curved surface 181F1. The arc-shaped curved surface 181F1 is connected between the upper surface 181K1 and the fifth surface 182a of the side plate 182. The provision of the arcuate surface 181F1 can prevent the first portion 181K and the second portion 181F from forming a right angle at the connection, thereby preventing the airflow inside the energy storage device 1000 from entering the groove 120 from the third air vent 132 and generating vortices due to the impact at the right angle. This is beneficial for guiding the airflow inside the energy storage device 1000 to the area below the explosion-proof valve 300, thereby improving the exhaust performance of the energy storage device 1000.

[0100] Please continue reading Figures 3 to 5In this embodiment, the end cap 200 may be a plain aluminum sheet. The end cap 200 is located on the side of the first surface 101 facing away from the second surface 102. The end cap 200 is provided with an explosion-proof hole 210, a second pole hole 220, and a second liquid injection hole 230. The explosion-proof hole 210, the second pole hole 220, and the second liquid injection hole 230 all extend through the end cap 200 along its thickness and are spaced apart from the lateral surfaces of the end cap 200. Along the length of the end cap 200, the explosion-proof hole 210 is located in the middle of the end cap 200 and is positioned opposite the first air vent 140, the first protective member 180, and the second protective member Q. It should be noted that the explosion-proof hole 210 being positioned opposite the groove 120 and the first air vent 140 means that the orthographic projection of the explosion-proof hole 210 on the lower insulator 100 at least partially covers the groove 120 and the first air vent 140.

[0101] The second pole hole 220 is spaced apart from the explosion-proof hole 210 and is connected to the first pole hole 150 for the pole 500 to pass through. There are two second pole holes 220. Along the length direction of the end cover 200, the two second pole holes 220 are respectively located on both sides of the explosion-proof hole 210 and are respectively connected to the two first pole holes 150. Specifically, one second pole hole 220 is connected to one first pole hole 150 for the positive pole to pass through. Another second pole hole 220 is connected to another first pole hole 150 for the negative pole to pass through. The second liquid injection hole 230 is located between the explosion-proof hole 210 and one second pole hole 220, and is spaced apart from the explosion-proof hole 210 and the second pole hole 220, and is connected to the first liquid injection hole 160.

[0102] The explosion-proof valve 300 covers the explosion-proof hole 210. Specifically, the explosion-proof valve 300 covers the opening of the explosion-proof hole 210 away from the lower insulating member 100 and is positioned opposite the first air vent 140, the first protective member 180, and the second protective member Q. It should be noted that the explosion-proof valve 300 is positioned opposite the first air vent 140, the first protective member 180, and the second protective member Q. This means that the orthographic projection of the explosion-proof valve 300 on the lower insulating member 100 at least partially covers the first air vent 140, the first protective member 180, and the second protective member Q. The protective sheet 400 covers the opening of the explosion-proof hole 210 closer to the lower insulating member 100 and protects the explosion-proof valve 300.

[0103] Along the thickness of the end cap assembly 3000, each pole 500 is inserted through one of the second pole holes 220 and one of the first pole holes 150. Each upper insulator 600 is disposed around a pole 500 and inserted through one of the second pole holes 220 and one of the first pole holes 150. Each sealing ring 700 is sleeved on an upper insulator 600 and inserted through one of the second pole holes 220 and one of the first pole holes 150. It is clamped between the surface of the end cap 200 proximate to the lower insulator 100 and the surface of a pole 500 proximate to the end cap 200. This not only seals the gap between the upper insulator 600 and the lower insulator 100, ensuring good airtightness of the end cap assembly 3000, but also provides insulation between the end cap 200 and the pole 500.

[0104] In this embodiment, a protective cover D is provided within the lower insulating member 100. This cover D completely blocks high-temperature solids ejected from the interior of the energy storage device 1000 in the event of thermal runaway, preventing combustible materials from being drawn out of the device 1000, thereby reducing the risk of fire and improving the safety of the device 1000. Furthermore, when the energy storage device 1000 experiences thermal runaway, the high-temperature, high-pressure gas generated within the device can be discharged through the first vent 140, the first through-hole 20, the fourth through-hole 25, the third through-hole 30, and the fifth through-hole 40 to the bottom of the explosion-proof valve 300. This gas is then discharged to the exterior of the energy storage device 1000 as the explosion-proof valve 300 opens, ensuring the proper exhaust performance of the device 1000.

[0105] This embodiment also provides an electrical device, such as an energy storage cabinet or a new energy vehicle. The electrical device includes the energy storage device 1000 described in the above embodiment, which is used to power the electrical device. Since the specific structure and technical effects of the energy storage device 1000 have been described in detail above, they will not be repeated here. The electrical device provided in this embodiment, by providing the energy storage device 1000, improves the exhaust performance and operational safety and reliability of the electrical device.

[0106] The above are only optional embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application, and does not limit the patent scope of the present application. At the same time, for those skilled in the art, according to the concept of the present application, equivalent structural transformations made using the description and drawings of the present application, or direct / indirect application in other related technical fields are all included in the patent protection scope of the present application.

Claims

1. A lower insulating member for use in an end cap assembly, characterized in that: The lower insulating member includes a first surface and a second surface, and along the thickness direction of the lower insulating member, the second surface is arranged opposite to the first surface; The lower insulating member is provided with a groove and a first vent hole, the opening of the groove is located on the first surface, the groove includes a groove bottom wall surface, the groove bottom wall surface is arranged opposite to the groove opening, and the first vent hole passes through the groove bottom wall surface and the second surface; The lower insulating member is provided with a protective cover, the protective cover comprising a first protective member, a second protective member and a support member, the first protective member is provided on the bottom wall of the groove and covers the first air vent, the first protective member comprises a baffle and a side plate, the baffle is located on the side of the first air vent away from the second surface, the baffle is provided with a first through hole, the first through hole passes through the baffle along the thickness direction of the lower insulating member, the side plate is provided on the bottom wall of the groove and surrounds the first air vent and the baffle, and is connected between the baffle and the bottom wall of the groove, and the support member is connected between the first protective member and the second protective member; The second protective member is located on the side of the baffle facing the first air vent, and is spaced apart from the baffle and opposite to the first through hole. The second protective member is provided with a connecting hole, which passes through the second protective member along the thickness direction of the second protective member and is connected with both the first through hole and the first air vent. The projections of the second protective member and the baffle on the bottom wall of the groove jointly cover the first air vent.

2. The lower insulating member according to claim 1, characterized in that There are a plurality of first through holes, and the plurality of first through holes are arranged at intervals along the circumference of the baffle; The second protective element includes a plurality of sub-protective elements, which are arranged at intervals along the circumference of the first vent hole, and each sub-protective element is arranged opposite to one of the first through holes.

3. The lower insulating member according to claim 2, characterized in that: The support member is arranged around the sub-protective member, and the support member is provided with a second through hole, which penetrates the support member along the thickness direction of the support member and is connected with the first air vent, the connecting hole and the first through hole, wherein the thickness direction of the support member is parallel to the first surface.

4. The lower insulator according to any one of claims 1 to 3, characterized in that: The side plate is provided with a third through hole, and the third through hole passes through the side plate along the thickness direction of the side plate and is communicated with the first through hole.

5. The lower insulating member according to claim 1, wherein: The baffle includes a third surface and a fourth surface, the third surface being the surface of the baffle facing away from the bottom wall of the groove, and the fourth surface being disposed opposite to the third surface along the thickness direction of the baffle; The first through hole includes a first hole portion and a second hole portion. The second hole portion is located on the side of the first hole portion facing the third surface and is connected to the first hole portion. The cross-sectional area of the second hole portion gradually increases along the direction from the fourth surface to the third surface.

6. The lower insulator according to any one of claims 1 to 3, characterized in that: The baffle is further provided with a fourth through hole, which passes through the baffle along the thickness direction of the lower insulating member and is spaced apart from the first through hole. The projection of the fourth through hole on the bottom wall of the groove is staggered with the first air vent.

7. The lower insulating member according to claim 6, characterized in that: The side plate is provided with a fifth through hole, which passes through the side plate along the thickness direction of the side plate and is communicated with the fourth through hole.

8. The lower insulating member according to claim 6, wherein: The baffle includes a third surface and a fourth surface, the third surface being the surface of the baffle facing away from the bottom wall of the groove, and the fourth surface being disposed opposite to the third surface along the thickness direction of the baffle; The fourth through hole includes a third hole portion and a fourth hole portion. The fourth hole portion is located on the side of the third hole portion facing the third surface and is connected to the third hole portion. The cross-sectional area of the fourth hole portion gradually increases along the direction from the fourth surface to the third surface.

9. The lower insulator according to any one of claims 1 to 3, characterized in that: Along the thickness direction of the side plate, the side plate includes a fifth surface away from the first air hole; The baffle includes a first portion and a second portion, the first portion is disposed opposite to the first vent hole, and the first portion includes an upper surface disposed opposite to the opening of the groove; The second part is fixedly connected between the first part and the side plate. The second part has an arcuate surface, and the arcuate surface is connected between the upper surface and the fifth surface.

10. The lower insulator according to any one of claims 1 to 3, characterized in that: The groove further includes a groove side wall surface, the groove side wall surface is arranged around the groove bottom wall surface and connected between the groove bottom wall surface and the first surface; The lower insulating member is further provided with a reinforcing rib, which is arranged on the bottom wall of the groove, connected to the side wall of the groove, and spaced apart from the protective cover.

11. The lower insulating member according to claim 10, characterized in that: The groove sidewall includes a first side surface and a second side surface, and along the length direction of the lower insulating member, the first side surface and the second side surface are spaced apart and arranged opposite to each other; There are multiple reinforcing ribs, and the multiple reinforcing ribs include multiple first reinforcing ribs and multiple second reinforcing ribs. The multiple first reinforcing ribs are located on the side of the protective cover close to the first side surface, and are connected to the first side surface, and are arranged at intervals along the width direction of the lower insulating member. The multiple second reinforcing ribs are located on the side of the protective cover close to the second side surface, and are connected to the second side surface, and are arranged at intervals along the width direction of the lower insulating member.

12. The lower insulator according to claim 1, wherein: The thermal deformation temperature of the protective cover is greater than or equal to 200°C.

13. An end cap assembly, characterized in that: The device comprises a lower insulating member, an end cover, and an explosion-proof valve according to any one of claims 1 to 12, wherein the end cover is located on a side of the first surface facing away from the second surface, the end cover is provided with an explosion-proof hole, the explosion-proof hole passes through the end cover along the thickness direction of the end cover, and is arranged opposite to the first protective member and the second protective member; The explosion-proof valve is installed on the end cover and covers the explosion-proof hole.

14. An energy storage device, characterized in that: The energy storage device includes a shell, a battery cell assembly and an end cover assembly as described in claim 13, the shell is provided with a receiving cavity and an opening, the receiving cavity is located on the inner side of the shell and contains electrolyte, the opening is located on the top side of the receiving cavity and is connected to the receiving cavity, the battery cell assembly is received in the receiving cavity, the end cover assembly is installed on the shell, closes the opening, and is electrically connected to the battery cell assembly.

15. An electrical device, characterized in that: The energy storage device according to claim 14 is used to supply power to the electrical equipment.

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